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_device.h> 37 #include <target/target_core_tmr.h> 38 #include <target/target_core_tpg.h> 39 #include <target/target_core_transport.h> 40 #include <target/target_core_fabric_ops.h> 41 #include <target/target_core_configfs.h> 42 43 #include "target_core_internal.h" 44 #include "target_core_pr.h" 45 #include "target_core_ua.h" 46 47 /* 48 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 49 */ 50 struct pr_transport_id_holder { 51 int dest_local_nexus; 52 struct t10_pr_registration *dest_pr_reg; 53 struct se_portal_group *dest_tpg; 54 struct se_node_acl *dest_node_acl; 55 struct se_dev_entry *dest_se_deve; 56 struct list_head dest_list; 57 }; 58 59 int core_pr_dump_initiator_port( 60 struct t10_pr_registration *pr_reg, 61 char *buf, 62 u32 size) 63 { 64 if (!pr_reg->isid_present_at_reg) 65 return 0; 66 67 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); 68 return 1; 69 } 70 71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 72 struct t10_pr_registration *, int); 73 74 static int core_scsi2_reservation_seq_non_holder( 75 struct se_cmd *cmd, 76 unsigned char *cdb, 77 u32 pr_reg_type) 78 { 79 switch (cdb[0]) { 80 case INQUIRY: 81 case RELEASE: 82 case RELEASE_10: 83 return 0; 84 default: 85 return 1; 86 } 87 88 return 1; 89 } 90 91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type) 92 { 93 struct se_device *dev = cmd->se_dev; 94 struct se_session *sess = cmd->se_sess; 95 int ret; 96 97 if (!sess) 98 return 0; 99 100 spin_lock(&dev->dev_reservation_lock); 101 if (!dev->dev_reserved_node_acl || !sess) { 102 spin_unlock(&dev->dev_reservation_lock); 103 return 0; 104 } 105 if (dev->dev_reserved_node_acl != sess->se_node_acl) { 106 spin_unlock(&dev->dev_reservation_lock); 107 return -EINVAL; 108 } 109 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) { 110 spin_unlock(&dev->dev_reservation_lock); 111 return 0; 112 } 113 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL; 114 spin_unlock(&dev->dev_reservation_lock); 115 116 return ret; 117 } 118 119 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 120 struct se_node_acl *, struct se_session *); 121 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 122 123 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret) 124 { 125 struct se_session *se_sess = cmd->se_sess; 126 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 127 struct t10_pr_registration *pr_reg; 128 struct t10_reservation *pr_tmpl = &su_dev->t10_pr; 129 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS); 130 int conflict = 0; 131 132 if (!crh) 133 return false; 134 135 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 136 se_sess); 137 if (pr_reg) { 138 /* 139 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 140 * behavior 141 * 142 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 143 * status, but no reservation shall be established and the 144 * persistent reservation shall not be changed, if the command 145 * is received from a) and b) below. 146 * 147 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 148 * status, but the persistent reservation shall not be released, 149 * if the command is received from a) and b) 150 * 151 * a) An I_T nexus that is a persistent reservation holder; or 152 * b) An I_T nexus that is registered if a registrants only or 153 * all registrants type persistent reservation is present. 154 * 155 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 156 * RELEASE(6) command, or RELEASE(10) command shall be processed 157 * as defined in SPC-2. 158 */ 159 if (pr_reg->pr_res_holder) { 160 core_scsi3_put_pr_reg(pr_reg); 161 *ret = 0; 162 return false; 163 } 164 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 165 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 166 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 168 core_scsi3_put_pr_reg(pr_reg); 169 *ret = 0; 170 return true; 171 } 172 core_scsi3_put_pr_reg(pr_reg); 173 conflict = 1; 174 } else { 175 /* 176 * Following spc2r20 5.5.1 Reservations overview: 177 * 178 * If a logical unit has executed a PERSISTENT RESERVE OUT 179 * command with the REGISTER or the REGISTER AND IGNORE 180 * EXISTING KEY service action and is still registered by any 181 * initiator, all RESERVE commands and all RELEASE commands 182 * regardless of initiator shall conflict and shall terminate 183 * with a RESERVATION CONFLICT status. 184 */ 185 spin_lock(&pr_tmpl->registration_lock); 186 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 187 spin_unlock(&pr_tmpl->registration_lock); 188 } 189 190 if (conflict) { 191 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 192 " while active SPC-3 registrations exist," 193 " returning RESERVATION_CONFLICT\n"); 194 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 195 return true; 196 } 197 198 return false; 199 } 200 201 int target_scsi2_reservation_release(struct se_task *task) 202 { 203 struct se_cmd *cmd = task->task_se_cmd; 204 struct se_device *dev = cmd->se_dev; 205 struct se_session *sess = cmd->se_sess; 206 struct se_portal_group *tpg = sess->se_tpg; 207 int ret = 0; 208 209 if (!sess || !tpg) 210 goto out; 211 if (target_check_scsi2_reservation_conflict(cmd, &ret)) 212 goto out; 213 214 ret = 0; 215 spin_lock(&dev->dev_reservation_lock); 216 if (!dev->dev_reserved_node_acl || !sess) 217 goto out_unlock; 218 219 if (dev->dev_reserved_node_acl != sess->se_node_acl) 220 goto out_unlock; 221 222 dev->dev_reserved_node_acl = NULL; 223 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 224 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 225 dev->dev_res_bin_isid = 0; 226 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 227 } 228 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 229 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 230 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 231 sess->se_node_acl->initiatorname); 232 233 out_unlock: 234 spin_unlock(&dev->dev_reservation_lock); 235 out: 236 if (!ret) { 237 task->task_scsi_status = GOOD; 238 transport_complete_task(task, 1); 239 } 240 return ret; 241 } 242 243 int target_scsi2_reservation_reserve(struct se_task *task) 244 { 245 struct se_cmd *cmd = task->task_se_cmd; 246 struct se_device *dev = cmd->se_dev; 247 struct se_session *sess = cmd->se_sess; 248 struct se_portal_group *tpg = sess->se_tpg; 249 int ret = 0; 250 251 if ((cmd->t_task_cdb[1] & 0x01) && 252 (cmd->t_task_cdb[1] & 0x02)) { 253 pr_err("LongIO and Obselete Bits set, returning" 254 " ILLEGAL_REQUEST\n"); 255 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 256 ret = -EINVAL; 257 goto out; 258 } 259 /* 260 * This is currently the case for target_core_mod passthrough struct se_cmd 261 * ops 262 */ 263 if (!sess || !tpg) 264 goto out; 265 if (target_check_scsi2_reservation_conflict(cmd, &ret)) 266 goto out; 267 268 ret = 0; 269 spin_lock(&dev->dev_reservation_lock); 270 if (dev->dev_reserved_node_acl && 271 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 272 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 273 tpg->se_tpg_tfo->get_fabric_name()); 274 pr_err("Original reserver LUN: %u %s\n", 275 cmd->se_lun->unpacked_lun, 276 dev->dev_reserved_node_acl->initiatorname); 277 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 278 " from %s \n", cmd->se_lun->unpacked_lun, 279 cmd->se_deve->mapped_lun, 280 sess->se_node_acl->initiatorname); 281 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 282 ret = -EINVAL; 283 goto out_unlock; 284 } 285 286 dev->dev_reserved_node_acl = sess->se_node_acl; 287 dev->dev_flags |= DF_SPC2_RESERVATIONS; 288 if (sess->sess_bin_isid != 0) { 289 dev->dev_res_bin_isid = sess->sess_bin_isid; 290 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 291 } 292 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 293 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 294 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 295 sess->se_node_acl->initiatorname); 296 297 out_unlock: 298 spin_unlock(&dev->dev_reservation_lock); 299 out: 300 if (!ret) { 301 task->task_scsi_status = GOOD; 302 transport_complete_task(task, 1); 303 } 304 return ret; 305 } 306 307 308 /* 309 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 310 * 311 * This function is called by those initiator ports who are *NOT* 312 * the active PR reservation holder when a reservation is present. 313 */ 314 static int core_scsi3_pr_seq_non_holder( 315 struct se_cmd *cmd, 316 unsigned char *cdb, 317 u32 pr_reg_type) 318 { 319 struct se_dev_entry *se_deve; 320 struct se_session *se_sess = cmd->se_sess; 321 int other_cdb = 0, ignore_reg; 322 int registered_nexus = 0, ret = 1; /* Conflict by default */ 323 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 324 int we = 0; /* Write Exclusive */ 325 int legacy = 0; /* Act like a legacy device and return 326 * RESERVATION CONFLICT on some CDBs */ 327 /* 328 * A legacy SPC-2 reservation is being held. 329 */ 330 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 331 return core_scsi2_reservation_seq_non_holder(cmd, 332 cdb, pr_reg_type); 333 334 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 335 /* 336 * Determine if the registration should be ignored due to 337 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 338 */ 339 ignore_reg = (pr_reg_type & 0x80000000); 340 if (ignore_reg) 341 pr_reg_type &= ~0x80000000; 342 343 switch (pr_reg_type) { 344 case PR_TYPE_WRITE_EXCLUSIVE: 345 we = 1; 346 case PR_TYPE_EXCLUSIVE_ACCESS: 347 /* 348 * Some commands are only allowed for the persistent reservation 349 * holder. 350 */ 351 if ((se_deve->def_pr_registered) && !(ignore_reg)) 352 registered_nexus = 1; 353 break; 354 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 355 we = 1; 356 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 357 /* 358 * Some commands are only allowed for registered I_T Nexuses. 359 */ 360 reg_only = 1; 361 if ((se_deve->def_pr_registered) && !(ignore_reg)) 362 registered_nexus = 1; 363 break; 364 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 365 we = 1; 366 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 367 /* 368 * Each registered I_T Nexus is a reservation holder. 369 */ 370 all_reg = 1; 371 if ((se_deve->def_pr_registered) && !(ignore_reg)) 372 registered_nexus = 1; 373 break; 374 default: 375 return -EINVAL; 376 } 377 /* 378 * Referenced from spc4r17 table 45 for *NON* PR holder access 379 */ 380 switch (cdb[0]) { 381 case SECURITY_PROTOCOL_IN: 382 if (registered_nexus) 383 return 0; 384 ret = (we) ? 0 : 1; 385 break; 386 case MODE_SENSE: 387 case MODE_SENSE_10: 388 case READ_ATTRIBUTE: 389 case READ_BUFFER: 390 case RECEIVE_DIAGNOSTIC: 391 if (legacy) { 392 ret = 1; 393 break; 394 } 395 if (registered_nexus) { 396 ret = 0; 397 break; 398 } 399 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 400 break; 401 case PERSISTENT_RESERVE_OUT: 402 /* 403 * This follows PERSISTENT_RESERVE_OUT service actions that 404 * are allowed in the presence of various reservations. 405 * See spc4r17, table 46 406 */ 407 switch (cdb[1] & 0x1f) { 408 case PRO_CLEAR: 409 case PRO_PREEMPT: 410 case PRO_PREEMPT_AND_ABORT: 411 ret = (registered_nexus) ? 0 : 1; 412 break; 413 case PRO_REGISTER: 414 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 415 ret = 0; 416 break; 417 case PRO_REGISTER_AND_MOVE: 418 case PRO_RESERVE: 419 ret = 1; 420 break; 421 case PRO_RELEASE: 422 ret = (registered_nexus) ? 0 : 1; 423 break; 424 default: 425 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 426 " action: 0x%02x\n", cdb[1] & 0x1f); 427 return -EINVAL; 428 } 429 break; 430 case RELEASE: 431 case RELEASE_10: 432 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 433 ret = 0; 434 break; 435 case RESERVE: 436 case RESERVE_10: 437 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 438 ret = 0; 439 break; 440 case TEST_UNIT_READY: 441 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 442 break; 443 case MAINTENANCE_IN: 444 switch (cdb[1] & 0x1f) { 445 case MI_MANAGEMENT_PROTOCOL_IN: 446 if (registered_nexus) { 447 ret = 0; 448 break; 449 } 450 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 451 break; 452 case MI_REPORT_SUPPORTED_OPERATION_CODES: 453 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 454 if (legacy) { 455 ret = 1; 456 break; 457 } 458 if (registered_nexus) { 459 ret = 0; 460 break; 461 } 462 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 463 break; 464 case MI_REPORT_ALIASES: 465 case MI_REPORT_IDENTIFYING_INFORMATION: 466 case MI_REPORT_PRIORITY: 467 case MI_REPORT_TARGET_PGS: 468 case MI_REPORT_TIMESTAMP: 469 ret = 0; /* Allowed */ 470 break; 471 default: 472 pr_err("Unknown MI Service Action: 0x%02x\n", 473 (cdb[1] & 0x1f)); 474 return -EINVAL; 475 } 476 break; 477 case ACCESS_CONTROL_IN: 478 case ACCESS_CONTROL_OUT: 479 case INQUIRY: 480 case LOG_SENSE: 481 case READ_MEDIA_SERIAL_NUMBER: 482 case REPORT_LUNS: 483 case REQUEST_SENSE: 484 ret = 0; /*/ Allowed CDBs */ 485 break; 486 default: 487 other_cdb = 1; 488 break; 489 } 490 /* 491 * Case where the CDB is explicitly allowed in the above switch 492 * statement. 493 */ 494 if (!ret && !other_cdb) { 495 #if 0 496 pr_debug("Allowing explict CDB: 0x%02x for %s" 497 " reservation holder\n", cdb[0], 498 core_scsi3_pr_dump_type(pr_reg_type)); 499 #endif 500 return ret; 501 } 502 /* 503 * Check if write exclusive initiator ports *NOT* holding the 504 * WRITE_EXCLUSIVE_* reservation. 505 */ 506 if ((we) && !(registered_nexus)) { 507 if (cmd->data_direction == DMA_TO_DEVICE) { 508 /* 509 * Conflict for write exclusive 510 */ 511 pr_debug("%s Conflict for unregistered nexus" 512 " %s CDB: 0x%02x to %s reservation\n", 513 transport_dump_cmd_direction(cmd), 514 se_sess->se_node_acl->initiatorname, cdb[0], 515 core_scsi3_pr_dump_type(pr_reg_type)); 516 return 1; 517 } else { 518 /* 519 * Allow non WRITE CDBs for all Write Exclusive 520 * PR TYPEs to pass for registered and 521 * non-registered_nexuxes NOT holding the reservation. 522 * 523 * We only make noise for the unregisterd nexuses, 524 * as we expect registered non-reservation holding 525 * nexuses to issue CDBs. 526 */ 527 #if 0 528 if (!registered_nexus) { 529 pr_debug("Allowing implict CDB: 0x%02x" 530 " for %s reservation on unregistered" 531 " nexus\n", cdb[0], 532 core_scsi3_pr_dump_type(pr_reg_type)); 533 } 534 #endif 535 return 0; 536 } 537 } else if ((reg_only) || (all_reg)) { 538 if (registered_nexus) { 539 /* 540 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 541 * allow commands from registered nexuses. 542 */ 543 #if 0 544 pr_debug("Allowing implict CDB: 0x%02x for %s" 545 " reservation\n", cdb[0], 546 core_scsi3_pr_dump_type(pr_reg_type)); 547 #endif 548 return 0; 549 } 550 } 551 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 552 " for %s reservation\n", transport_dump_cmd_direction(cmd), 553 (registered_nexus) ? "" : "un", 554 se_sess->se_node_acl->initiatorname, cdb[0], 555 core_scsi3_pr_dump_type(pr_reg_type)); 556 557 return 1; /* Conflict by default */ 558 } 559 560 static u32 core_scsi3_pr_generation(struct se_device *dev) 561 { 562 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 563 u32 prg; 564 /* 565 * PRGeneration field shall contain the value of a 32-bit wrapping 566 * counter mainted by the device server. 567 * 568 * Note that this is done regardless of Active Persist across 569 * Target PowerLoss (APTPL) 570 * 571 * See spc4r17 section 6.3.12 READ_KEYS service action 572 */ 573 spin_lock(&dev->dev_reservation_lock); 574 prg = su_dev->t10_pr.pr_generation++; 575 spin_unlock(&dev->dev_reservation_lock); 576 577 return prg; 578 } 579 580 static int core_scsi3_pr_reservation_check( 581 struct se_cmd *cmd, 582 u32 *pr_reg_type) 583 { 584 struct se_device *dev = cmd->se_dev; 585 struct se_session *sess = cmd->se_sess; 586 int ret; 587 588 if (!sess) 589 return 0; 590 /* 591 * A legacy SPC-2 reservation is being held. 592 */ 593 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 594 return core_scsi2_reservation_check(cmd, pr_reg_type); 595 596 spin_lock(&dev->dev_reservation_lock); 597 if (!dev->dev_pr_res_holder) { 598 spin_unlock(&dev->dev_reservation_lock); 599 return 0; 600 } 601 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 602 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 603 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 604 spin_unlock(&dev->dev_reservation_lock); 605 return -EINVAL; 606 } 607 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 608 spin_unlock(&dev->dev_reservation_lock); 609 return 0; 610 } 611 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 612 sess->sess_bin_isid) ? 0 : -EINVAL; 613 /* 614 * Use bit in *pr_reg_type to notify ISID mismatch in 615 * core_scsi3_pr_seq_non_holder(). 616 */ 617 if (ret != 0) 618 *pr_reg_type |= 0x80000000; 619 spin_unlock(&dev->dev_reservation_lock); 620 621 return ret; 622 } 623 624 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 625 struct se_device *dev, 626 struct se_node_acl *nacl, 627 struct se_dev_entry *deve, 628 unsigned char *isid, 629 u64 sa_res_key, 630 int all_tg_pt, 631 int aptpl) 632 { 633 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 634 struct t10_pr_registration *pr_reg; 635 636 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 637 if (!pr_reg) { 638 pr_err("Unable to allocate struct t10_pr_registration\n"); 639 return NULL; 640 } 641 642 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 643 GFP_ATOMIC); 644 if (!pr_reg->pr_aptpl_buf) { 645 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 646 kmem_cache_free(t10_pr_reg_cache, pr_reg); 647 return NULL; 648 } 649 650 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 651 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 652 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 653 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 654 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 655 atomic_set(&pr_reg->pr_res_holders, 0); 656 pr_reg->pr_reg_nacl = nacl; 657 pr_reg->pr_reg_deve = deve; 658 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 659 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 660 pr_reg->pr_res_key = sa_res_key; 661 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 662 pr_reg->pr_reg_aptpl = aptpl; 663 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 664 /* 665 * If an ISID value for this SCSI Initiator Port exists, 666 * save it to the registration now. 667 */ 668 if (isid != NULL) { 669 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 670 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 671 pr_reg->isid_present_at_reg = 1; 672 } 673 674 return pr_reg; 675 } 676 677 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 678 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 679 680 /* 681 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 682 * modes. 683 */ 684 static struct t10_pr_registration *__core_scsi3_alloc_registration( 685 struct se_device *dev, 686 struct se_node_acl *nacl, 687 struct se_dev_entry *deve, 688 unsigned char *isid, 689 u64 sa_res_key, 690 int all_tg_pt, 691 int aptpl) 692 { 693 struct se_dev_entry *deve_tmp; 694 struct se_node_acl *nacl_tmp; 695 struct se_port *port, *port_tmp; 696 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 697 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 698 int ret; 699 /* 700 * Create a registration for the I_T Nexus upon which the 701 * PROUT REGISTER was received. 702 */ 703 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 704 sa_res_key, all_tg_pt, aptpl); 705 if (!pr_reg) 706 return NULL; 707 /* 708 * Return pointer to pr_reg for ALL_TG_PT=0 709 */ 710 if (!all_tg_pt) 711 return pr_reg; 712 /* 713 * Create list of matching SCSI Initiator Port registrations 714 * for ALL_TG_PT=1 715 */ 716 spin_lock(&dev->se_port_lock); 717 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 718 atomic_inc(&port->sep_tg_pt_ref_cnt); 719 smp_mb__after_atomic_inc(); 720 spin_unlock(&dev->se_port_lock); 721 722 spin_lock_bh(&port->sep_alua_lock); 723 list_for_each_entry(deve_tmp, &port->sep_alua_list, 724 alua_port_list) { 725 /* 726 * This pointer will be NULL for demo mode MappedLUNs 727 * that have not been make explict via a ConfigFS 728 * MappedLUN group for the SCSI Initiator Node ACL. 729 */ 730 if (!deve_tmp->se_lun_acl) 731 continue; 732 733 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 734 /* 735 * Skip the matching struct se_node_acl that is allocated 736 * above.. 737 */ 738 if (nacl == nacl_tmp) 739 continue; 740 /* 741 * Only perform PR registrations for target ports on 742 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 743 * arrived. 744 */ 745 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 746 continue; 747 /* 748 * Look for a matching Initiator Node ACL in ASCII format 749 */ 750 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 751 continue; 752 753 atomic_inc(&deve_tmp->pr_ref_count); 754 smp_mb__after_atomic_inc(); 755 spin_unlock_bh(&port->sep_alua_lock); 756 /* 757 * Grab a configfs group dependency that is released 758 * for the exception path at label out: below, or upon 759 * completion of adding ALL_TG_PT=1 registrations in 760 * __core_scsi3_add_registration() 761 */ 762 ret = core_scsi3_lunacl_depend_item(deve_tmp); 763 if (ret < 0) { 764 pr_err("core_scsi3_lunacl_depend" 765 "_item() failed\n"); 766 atomic_dec(&port->sep_tg_pt_ref_cnt); 767 smp_mb__after_atomic_dec(); 768 atomic_dec(&deve_tmp->pr_ref_count); 769 smp_mb__after_atomic_dec(); 770 goto out; 771 } 772 /* 773 * Located a matching SCSI Initiator Port on a different 774 * port, allocate the pr_reg_atp and attach it to the 775 * pr_reg->pr_reg_atp_list that will be processed once 776 * the original *pr_reg is processed in 777 * __core_scsi3_add_registration() 778 */ 779 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 780 nacl_tmp, deve_tmp, NULL, 781 sa_res_key, all_tg_pt, aptpl); 782 if (!pr_reg_atp) { 783 atomic_dec(&port->sep_tg_pt_ref_cnt); 784 smp_mb__after_atomic_dec(); 785 atomic_dec(&deve_tmp->pr_ref_count); 786 smp_mb__after_atomic_dec(); 787 core_scsi3_lunacl_undepend_item(deve_tmp); 788 goto out; 789 } 790 791 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 792 &pr_reg->pr_reg_atp_list); 793 spin_lock_bh(&port->sep_alua_lock); 794 } 795 spin_unlock_bh(&port->sep_alua_lock); 796 797 spin_lock(&dev->se_port_lock); 798 atomic_dec(&port->sep_tg_pt_ref_cnt); 799 smp_mb__after_atomic_dec(); 800 } 801 spin_unlock(&dev->se_port_lock); 802 803 return pr_reg; 804 out: 805 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 806 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 807 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 808 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 809 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 810 } 811 kmem_cache_free(t10_pr_reg_cache, pr_reg); 812 return NULL; 813 } 814 815 int core_scsi3_alloc_aptpl_registration( 816 struct t10_reservation *pr_tmpl, 817 u64 sa_res_key, 818 unsigned char *i_port, 819 unsigned char *isid, 820 u32 mapped_lun, 821 unsigned char *t_port, 822 u16 tpgt, 823 u32 target_lun, 824 int res_holder, 825 int all_tg_pt, 826 u8 type) 827 { 828 struct t10_pr_registration *pr_reg; 829 830 if (!i_port || !t_port || !sa_res_key) { 831 pr_err("Illegal parameters for APTPL registration\n"); 832 return -EINVAL; 833 } 834 835 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 836 if (!pr_reg) { 837 pr_err("Unable to allocate struct t10_pr_registration\n"); 838 return -ENOMEM; 839 } 840 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 841 842 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 843 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 844 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 845 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 846 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 847 atomic_set(&pr_reg->pr_res_holders, 0); 848 pr_reg->pr_reg_nacl = NULL; 849 pr_reg->pr_reg_deve = NULL; 850 pr_reg->pr_res_mapped_lun = mapped_lun; 851 pr_reg->pr_aptpl_target_lun = target_lun; 852 pr_reg->pr_res_key = sa_res_key; 853 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 854 pr_reg->pr_reg_aptpl = 1; 855 pr_reg->pr_reg_tg_pt_lun = NULL; 856 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 857 pr_reg->pr_res_type = type; 858 /* 859 * If an ISID value had been saved in APTPL metadata for this 860 * SCSI Initiator Port, restore it now. 861 */ 862 if (isid != NULL) { 863 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 864 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 865 pr_reg->isid_present_at_reg = 1; 866 } 867 /* 868 * Copy the i_port and t_port information from caller. 869 */ 870 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 871 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 872 pr_reg->pr_reg_tpgt = tpgt; 873 /* 874 * Set pr_res_holder from caller, the pr_reg who is the reservation 875 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 876 * the Initiator Node LUN ACL from the fabric module is created for 877 * this registration. 878 */ 879 pr_reg->pr_res_holder = res_holder; 880 881 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 882 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 883 " metadata\n", (res_holder) ? "+reservation" : ""); 884 return 0; 885 } 886 887 static void core_scsi3_aptpl_reserve( 888 struct se_device *dev, 889 struct se_portal_group *tpg, 890 struct se_node_acl *node_acl, 891 struct t10_pr_registration *pr_reg) 892 { 893 char i_buf[PR_REG_ISID_ID_LEN]; 894 int prf_isid; 895 896 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 897 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 898 PR_REG_ISID_ID_LEN); 899 900 spin_lock(&dev->dev_reservation_lock); 901 dev->dev_pr_res_holder = pr_reg; 902 spin_unlock(&dev->dev_reservation_lock); 903 904 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 905 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 906 tpg->se_tpg_tfo->get_fabric_name(), 907 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 908 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 909 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 910 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 911 (prf_isid) ? &i_buf[0] : ""); 912 } 913 914 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 915 struct t10_pr_registration *, int, int); 916 917 static int __core_scsi3_check_aptpl_registration( 918 struct se_device *dev, 919 struct se_portal_group *tpg, 920 struct se_lun *lun, 921 u32 target_lun, 922 struct se_node_acl *nacl, 923 struct se_dev_entry *deve) 924 { 925 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 926 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 927 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 928 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 929 u16 tpgt; 930 931 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 932 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 933 /* 934 * Copy Initiator Port information from struct se_node_acl 935 */ 936 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 937 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 938 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 939 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 940 /* 941 * Look for the matching registrations+reservation from those 942 * created from APTPL metadata. Note that multiple registrations 943 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 944 * TransportIDs. 945 */ 946 spin_lock(&pr_tmpl->aptpl_reg_lock); 947 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 948 pr_reg_aptpl_list) { 949 if (!strcmp(pr_reg->pr_iport, i_port) && 950 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 951 !(strcmp(pr_reg->pr_tport, t_port)) && 952 (pr_reg->pr_reg_tpgt == tpgt) && 953 (pr_reg->pr_aptpl_target_lun == target_lun)) { 954 955 pr_reg->pr_reg_nacl = nacl; 956 pr_reg->pr_reg_deve = deve; 957 pr_reg->pr_reg_tg_pt_lun = lun; 958 959 list_del(&pr_reg->pr_reg_aptpl_list); 960 spin_unlock(&pr_tmpl->aptpl_reg_lock); 961 /* 962 * At this point all of the pointers in *pr_reg will 963 * be setup, so go ahead and add the registration. 964 */ 965 966 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 967 /* 968 * If this registration is the reservation holder, 969 * make that happen now.. 970 */ 971 if (pr_reg->pr_res_holder) 972 core_scsi3_aptpl_reserve(dev, tpg, 973 nacl, pr_reg); 974 /* 975 * Reenable pr_aptpl_active to accept new metadata 976 * updates once the SCSI device is active again.. 977 */ 978 spin_lock(&pr_tmpl->aptpl_reg_lock); 979 pr_tmpl->pr_aptpl_active = 1; 980 } 981 } 982 spin_unlock(&pr_tmpl->aptpl_reg_lock); 983 984 return 0; 985 } 986 987 int core_scsi3_check_aptpl_registration( 988 struct se_device *dev, 989 struct se_portal_group *tpg, 990 struct se_lun *lun, 991 struct se_lun_acl *lun_acl) 992 { 993 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 994 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 995 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun]; 996 997 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 998 return 0; 999 1000 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1001 lun->unpacked_lun, nacl, deve); 1002 } 1003 1004 static void __core_scsi3_dump_registration( 1005 struct target_core_fabric_ops *tfo, 1006 struct se_device *dev, 1007 struct se_node_acl *nacl, 1008 struct t10_pr_registration *pr_reg, 1009 int register_type) 1010 { 1011 struct se_portal_group *se_tpg = nacl->se_tpg; 1012 char i_buf[PR_REG_ISID_ID_LEN]; 1013 int prf_isid; 1014 1015 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1016 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1017 PR_REG_ISID_ID_LEN); 1018 1019 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1020 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1021 "_AND_MOVE" : (register_type == 1) ? 1022 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1023 (prf_isid) ? i_buf : ""); 1024 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1025 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1026 tfo->tpg_get_tag(se_tpg)); 1027 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1028 " Port(s)\n", tfo->get_fabric_name(), 1029 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1030 dev->transport->name); 1031 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1032 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1033 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1034 pr_reg->pr_reg_aptpl); 1035 } 1036 1037 /* 1038 * this function can be called with struct se_device->dev_reservation_lock 1039 * when register_move = 1 1040 */ 1041 static void __core_scsi3_add_registration( 1042 struct se_device *dev, 1043 struct se_node_acl *nacl, 1044 struct t10_pr_registration *pr_reg, 1045 int register_type, 1046 int register_move) 1047 { 1048 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1049 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1050 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1051 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1052 1053 /* 1054 * Increment PRgeneration counter for struct se_device upon a successful 1055 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1056 * 1057 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1058 * action, the struct se_device->dev_reservation_lock will already be held, 1059 * so we do not call core_scsi3_pr_generation() which grabs the lock 1060 * for the REGISTER. 1061 */ 1062 pr_reg->pr_res_generation = (register_move) ? 1063 su_dev->t10_pr.pr_generation++ : 1064 core_scsi3_pr_generation(dev); 1065 1066 spin_lock(&pr_tmpl->registration_lock); 1067 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1068 pr_reg->pr_reg_deve->def_pr_registered = 1; 1069 1070 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1071 spin_unlock(&pr_tmpl->registration_lock); 1072 /* 1073 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1074 */ 1075 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1076 return; 1077 /* 1078 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1079 * allocated in __core_scsi3_alloc_registration() 1080 */ 1081 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1082 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1083 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1084 1085 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1086 1087 spin_lock(&pr_tmpl->registration_lock); 1088 list_add_tail(&pr_reg_tmp->pr_reg_list, 1089 &pr_tmpl->registration_list); 1090 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1091 1092 __core_scsi3_dump_registration(tfo, dev, 1093 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1094 register_type); 1095 spin_unlock(&pr_tmpl->registration_lock); 1096 /* 1097 * Drop configfs group dependency reference from 1098 * __core_scsi3_alloc_registration() 1099 */ 1100 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1101 } 1102 } 1103 1104 static int core_scsi3_alloc_registration( 1105 struct se_device *dev, 1106 struct se_node_acl *nacl, 1107 struct se_dev_entry *deve, 1108 unsigned char *isid, 1109 u64 sa_res_key, 1110 int all_tg_pt, 1111 int aptpl, 1112 int register_type, 1113 int register_move) 1114 { 1115 struct t10_pr_registration *pr_reg; 1116 1117 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1118 sa_res_key, all_tg_pt, aptpl); 1119 if (!pr_reg) 1120 return -EPERM; 1121 1122 __core_scsi3_add_registration(dev, nacl, pr_reg, 1123 register_type, register_move); 1124 return 0; 1125 } 1126 1127 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1128 struct se_device *dev, 1129 struct se_node_acl *nacl, 1130 unsigned char *isid) 1131 { 1132 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1133 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1134 struct se_portal_group *tpg; 1135 1136 spin_lock(&pr_tmpl->registration_lock); 1137 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1138 &pr_tmpl->registration_list, pr_reg_list) { 1139 /* 1140 * First look for a matching struct se_node_acl 1141 */ 1142 if (pr_reg->pr_reg_nacl != nacl) 1143 continue; 1144 1145 tpg = pr_reg->pr_reg_nacl->se_tpg; 1146 /* 1147 * If this registration does NOT contain a fabric provided 1148 * ISID, then we have found a match. 1149 */ 1150 if (!pr_reg->isid_present_at_reg) { 1151 /* 1152 * Determine if this SCSI device server requires that 1153 * SCSI Intiatior TransportID w/ ISIDs is enforced 1154 * for fabric modules (iSCSI) requiring them. 1155 */ 1156 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1157 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1158 continue; 1159 } 1160 atomic_inc(&pr_reg->pr_res_holders); 1161 smp_mb__after_atomic_inc(); 1162 spin_unlock(&pr_tmpl->registration_lock); 1163 return pr_reg; 1164 } 1165 /* 1166 * If the *pr_reg contains a fabric defined ISID for multi-value 1167 * SCSI Initiator Port TransportIDs, then we expect a valid 1168 * matching ISID to be provided by the local SCSI Initiator Port. 1169 */ 1170 if (!isid) 1171 continue; 1172 if (strcmp(isid, pr_reg->pr_reg_isid)) 1173 continue; 1174 1175 atomic_inc(&pr_reg->pr_res_holders); 1176 smp_mb__after_atomic_inc(); 1177 spin_unlock(&pr_tmpl->registration_lock); 1178 return pr_reg; 1179 } 1180 spin_unlock(&pr_tmpl->registration_lock); 1181 1182 return NULL; 1183 } 1184 1185 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1186 struct se_device *dev, 1187 struct se_node_acl *nacl, 1188 struct se_session *sess) 1189 { 1190 struct se_portal_group *tpg = nacl->se_tpg; 1191 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1192 1193 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1194 memset(&buf[0], 0, PR_REG_ISID_LEN); 1195 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1196 PR_REG_ISID_LEN); 1197 isid_ptr = &buf[0]; 1198 } 1199 1200 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1201 } 1202 1203 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1204 { 1205 atomic_dec(&pr_reg->pr_res_holders); 1206 smp_mb__after_atomic_dec(); 1207 } 1208 1209 static int core_scsi3_check_implict_release( 1210 struct se_device *dev, 1211 struct t10_pr_registration *pr_reg) 1212 { 1213 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1214 struct t10_pr_registration *pr_res_holder; 1215 int ret = 0; 1216 1217 spin_lock(&dev->dev_reservation_lock); 1218 pr_res_holder = dev->dev_pr_res_holder; 1219 if (!pr_res_holder) { 1220 spin_unlock(&dev->dev_reservation_lock); 1221 return ret; 1222 } 1223 if (pr_res_holder == pr_reg) { 1224 /* 1225 * Perform an implict RELEASE if the registration that 1226 * is being released is holding the reservation. 1227 * 1228 * From spc4r17, section 5.7.11.1: 1229 * 1230 * e) If the I_T nexus is the persistent reservation holder 1231 * and the persistent reservation is not an all registrants 1232 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1233 * service action or REGISTER AND IGNORE EXISTING KEY 1234 * service action with the SERVICE ACTION RESERVATION KEY 1235 * field set to zero (see 5.7.11.3). 1236 */ 1237 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1238 ret = 1; 1239 /* 1240 * For 'All Registrants' reservation types, all existing 1241 * registrations are still processed as reservation holders 1242 * in core_scsi3_pr_seq_non_holder() after the initial 1243 * reservation holder is implictly released here. 1244 */ 1245 } else if (pr_reg->pr_reg_all_tg_pt && 1246 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1247 pr_reg->pr_reg_nacl->initiatorname)) && 1248 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1249 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1250 " UNREGISTER while existing reservation with matching" 1251 " key 0x%016Lx is present from another SCSI Initiator" 1252 " Port\n", pr_reg->pr_res_key); 1253 ret = -EPERM; 1254 } 1255 spin_unlock(&dev->dev_reservation_lock); 1256 1257 return ret; 1258 } 1259 1260 /* 1261 * Called with struct t10_reservation->registration_lock held. 1262 */ 1263 static void __core_scsi3_free_registration( 1264 struct se_device *dev, 1265 struct t10_pr_registration *pr_reg, 1266 struct list_head *preempt_and_abort_list, 1267 int dec_holders) 1268 { 1269 struct target_core_fabric_ops *tfo = 1270 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1271 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1272 char i_buf[PR_REG_ISID_ID_LEN]; 1273 int prf_isid; 1274 1275 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1276 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1277 PR_REG_ISID_ID_LEN); 1278 1279 pr_reg->pr_reg_deve->def_pr_registered = 0; 1280 pr_reg->pr_reg_deve->pr_res_key = 0; 1281 list_del(&pr_reg->pr_reg_list); 1282 /* 1283 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1284 * so call core_scsi3_put_pr_reg() to decrement our reference. 1285 */ 1286 if (dec_holders) 1287 core_scsi3_put_pr_reg(pr_reg); 1288 /* 1289 * Wait until all reference from any other I_T nexuses for this 1290 * *pr_reg have been released. Because list_del() is called above, 1291 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1292 * count back to zero, and we release *pr_reg. 1293 */ 1294 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1295 spin_unlock(&pr_tmpl->registration_lock); 1296 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1297 tfo->get_fabric_name()); 1298 cpu_relax(); 1299 spin_lock(&pr_tmpl->registration_lock); 1300 } 1301 1302 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1303 " Node: %s%s\n", tfo->get_fabric_name(), 1304 pr_reg->pr_reg_nacl->initiatorname, 1305 (prf_isid) ? &i_buf[0] : ""); 1306 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1307 " Port(s)\n", tfo->get_fabric_name(), 1308 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1309 dev->transport->name); 1310 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1311 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1312 pr_reg->pr_res_generation); 1313 1314 if (!preempt_and_abort_list) { 1315 pr_reg->pr_reg_deve = NULL; 1316 pr_reg->pr_reg_nacl = NULL; 1317 kfree(pr_reg->pr_aptpl_buf); 1318 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1319 return; 1320 } 1321 /* 1322 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1323 * are released once the ABORT_TASK_SET has completed.. 1324 */ 1325 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1326 } 1327 1328 void core_scsi3_free_pr_reg_from_nacl( 1329 struct se_device *dev, 1330 struct se_node_acl *nacl) 1331 { 1332 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1333 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1334 /* 1335 * If the passed se_node_acl matches the reservation holder, 1336 * release the reservation. 1337 */ 1338 spin_lock(&dev->dev_reservation_lock); 1339 pr_res_holder = dev->dev_pr_res_holder; 1340 if ((pr_res_holder != NULL) && 1341 (pr_res_holder->pr_reg_nacl == nacl)) 1342 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1343 spin_unlock(&dev->dev_reservation_lock); 1344 /* 1345 * Release any registration associated with the struct se_node_acl. 1346 */ 1347 spin_lock(&pr_tmpl->registration_lock); 1348 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1349 &pr_tmpl->registration_list, pr_reg_list) { 1350 1351 if (pr_reg->pr_reg_nacl != nacl) 1352 continue; 1353 1354 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1355 } 1356 spin_unlock(&pr_tmpl->registration_lock); 1357 } 1358 1359 void core_scsi3_free_all_registrations( 1360 struct se_device *dev) 1361 { 1362 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1363 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1364 1365 spin_lock(&dev->dev_reservation_lock); 1366 pr_res_holder = dev->dev_pr_res_holder; 1367 if (pr_res_holder != NULL) { 1368 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1369 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1370 pr_res_holder, 0); 1371 } 1372 spin_unlock(&dev->dev_reservation_lock); 1373 1374 spin_lock(&pr_tmpl->registration_lock); 1375 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1376 &pr_tmpl->registration_list, pr_reg_list) { 1377 1378 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1379 } 1380 spin_unlock(&pr_tmpl->registration_lock); 1381 1382 spin_lock(&pr_tmpl->aptpl_reg_lock); 1383 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1384 pr_reg_aptpl_list) { 1385 list_del(&pr_reg->pr_reg_aptpl_list); 1386 kfree(pr_reg->pr_aptpl_buf); 1387 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1388 } 1389 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1390 } 1391 1392 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1393 { 1394 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1395 &tpg->tpg_group.cg_item); 1396 } 1397 1398 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1399 { 1400 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1401 &tpg->tpg_group.cg_item); 1402 1403 atomic_dec(&tpg->tpg_pr_ref_count); 1404 smp_mb__after_atomic_dec(); 1405 } 1406 1407 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1408 { 1409 struct se_portal_group *tpg = nacl->se_tpg; 1410 1411 if (nacl->dynamic_node_acl) 1412 return 0; 1413 1414 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1415 &nacl->acl_group.cg_item); 1416 } 1417 1418 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1419 { 1420 struct se_portal_group *tpg = nacl->se_tpg; 1421 1422 if (nacl->dynamic_node_acl) { 1423 atomic_dec(&nacl->acl_pr_ref_count); 1424 smp_mb__after_atomic_dec(); 1425 return; 1426 } 1427 1428 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1429 &nacl->acl_group.cg_item); 1430 1431 atomic_dec(&nacl->acl_pr_ref_count); 1432 smp_mb__after_atomic_dec(); 1433 } 1434 1435 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1436 { 1437 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1438 struct se_node_acl *nacl; 1439 struct se_portal_group *tpg; 1440 /* 1441 * For nacl->dynamic_node_acl=1 1442 */ 1443 if (!lun_acl) 1444 return 0; 1445 1446 nacl = lun_acl->se_lun_nacl; 1447 tpg = nacl->se_tpg; 1448 1449 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1450 &lun_acl->se_lun_group.cg_item); 1451 } 1452 1453 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1454 { 1455 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1456 struct se_node_acl *nacl; 1457 struct se_portal_group *tpg; 1458 /* 1459 * For nacl->dynamic_node_acl=1 1460 */ 1461 if (!lun_acl) { 1462 atomic_dec(&se_deve->pr_ref_count); 1463 smp_mb__after_atomic_dec(); 1464 return; 1465 } 1466 nacl = lun_acl->se_lun_nacl; 1467 tpg = nacl->se_tpg; 1468 1469 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1470 &lun_acl->se_lun_group.cg_item); 1471 1472 atomic_dec(&se_deve->pr_ref_count); 1473 smp_mb__after_atomic_dec(); 1474 } 1475 1476 static int core_scsi3_decode_spec_i_port( 1477 struct se_cmd *cmd, 1478 struct se_portal_group *tpg, 1479 unsigned char *l_isid, 1480 u64 sa_res_key, 1481 int all_tg_pt, 1482 int aptpl) 1483 { 1484 struct se_device *dev = cmd->se_dev; 1485 struct se_port *tmp_port; 1486 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1487 struct se_session *se_sess = cmd->se_sess; 1488 struct se_node_acl *dest_node_acl = NULL; 1489 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1490 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1491 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1492 struct list_head tid_dest_list; 1493 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1494 struct target_core_fabric_ops *tmp_tf_ops; 1495 unsigned char *buf; 1496 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1497 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1498 u32 tpdl, tid_len = 0; 1499 int ret, dest_local_nexus, prf_isid; 1500 u32 dest_rtpi = 0; 1501 1502 memset(dest_iport, 0, 64); 1503 INIT_LIST_HEAD(&tid_dest_list); 1504 1505 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1506 /* 1507 * Allocate a struct pr_transport_id_holder and setup the 1508 * local_node_acl and local_se_deve pointers and add to 1509 * struct list_head tid_dest_list for add registration 1510 * processing in the loop of tid_dest_list below. 1511 */ 1512 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1513 if (!tidh_new) { 1514 pr_err("Unable to allocate tidh_new\n"); 1515 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1516 return -EINVAL; 1517 } 1518 INIT_LIST_HEAD(&tidh_new->dest_list); 1519 tidh_new->dest_tpg = tpg; 1520 tidh_new->dest_node_acl = se_sess->se_node_acl; 1521 tidh_new->dest_se_deve = local_se_deve; 1522 1523 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1524 se_sess->se_node_acl, local_se_deve, l_isid, 1525 sa_res_key, all_tg_pt, aptpl); 1526 if (!local_pr_reg) { 1527 kfree(tidh_new); 1528 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1529 return -ENOMEM; 1530 } 1531 tidh_new->dest_pr_reg = local_pr_reg; 1532 /* 1533 * The local I_T nexus does not hold any configfs dependances, 1534 * so we set tid_h->dest_local_nexus=1 to prevent the 1535 * configfs_undepend_item() calls in the tid_dest_list loops below. 1536 */ 1537 tidh_new->dest_local_nexus = 1; 1538 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1539 1540 buf = transport_kmap_first_data_page(cmd); 1541 /* 1542 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1543 * first extract TransportID Parameter Data Length, and make sure 1544 * the value matches up to the SCSI expected data transfer length. 1545 */ 1546 tpdl = (buf[24] & 0xff) << 24; 1547 tpdl |= (buf[25] & 0xff) << 16; 1548 tpdl |= (buf[26] & 0xff) << 8; 1549 tpdl |= buf[27] & 0xff; 1550 1551 if ((tpdl + 28) != cmd->data_length) { 1552 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1553 " does not equal CDB data_length: %u\n", tpdl, 1554 cmd->data_length); 1555 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1556 ret = -EINVAL; 1557 goto out; 1558 } 1559 /* 1560 * Start processing the received transport IDs using the 1561 * receiving I_T Nexus portal's fabric dependent methods to 1562 * obtain the SCSI Initiator Port/Device Identifiers. 1563 */ 1564 ptr = &buf[28]; 1565 1566 while (tpdl > 0) { 1567 proto_ident = (ptr[0] & 0x0f); 1568 dest_tpg = NULL; 1569 1570 spin_lock(&dev->se_port_lock); 1571 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1572 tmp_tpg = tmp_port->sep_tpg; 1573 if (!tmp_tpg) 1574 continue; 1575 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1576 if (!tmp_tf_ops) 1577 continue; 1578 if (!tmp_tf_ops->get_fabric_proto_ident || 1579 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1580 continue; 1581 /* 1582 * Look for the matching proto_ident provided by 1583 * the received TransportID 1584 */ 1585 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1586 if (tmp_proto_ident != proto_ident) 1587 continue; 1588 dest_rtpi = tmp_port->sep_rtpi; 1589 1590 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1591 tmp_tpg, (const char *)ptr, &tid_len, 1592 &iport_ptr); 1593 if (!i_str) 1594 continue; 1595 1596 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1597 smp_mb__after_atomic_inc(); 1598 spin_unlock(&dev->se_port_lock); 1599 1600 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1601 if (ret != 0) { 1602 pr_err(" core_scsi3_tpg_depend_item()" 1603 " for tmp_tpg\n"); 1604 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1605 smp_mb__after_atomic_dec(); 1606 cmd->scsi_sense_reason = 1607 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1608 ret = -EINVAL; 1609 goto out; 1610 } 1611 /* 1612 * Locate the desination initiator ACL to be registered 1613 * from the decoded fabric module specific TransportID 1614 * at *i_str. 1615 */ 1616 spin_lock_irq(&tmp_tpg->acl_node_lock); 1617 dest_node_acl = __core_tpg_get_initiator_node_acl( 1618 tmp_tpg, i_str); 1619 if (dest_node_acl) { 1620 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1621 smp_mb__after_atomic_inc(); 1622 } 1623 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1624 1625 if (!dest_node_acl) { 1626 core_scsi3_tpg_undepend_item(tmp_tpg); 1627 spin_lock(&dev->se_port_lock); 1628 continue; 1629 } 1630 1631 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1632 if (ret != 0) { 1633 pr_err("configfs_depend_item() failed" 1634 " for dest_node_acl->acl_group\n"); 1635 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1636 smp_mb__after_atomic_dec(); 1637 core_scsi3_tpg_undepend_item(tmp_tpg); 1638 cmd->scsi_sense_reason = 1639 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1640 ret = -EINVAL; 1641 goto out; 1642 } 1643 1644 dest_tpg = tmp_tpg; 1645 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1646 " %s Port RTPI: %hu\n", 1647 dest_tpg->se_tpg_tfo->get_fabric_name(), 1648 dest_node_acl->initiatorname, dest_rtpi); 1649 1650 spin_lock(&dev->se_port_lock); 1651 break; 1652 } 1653 spin_unlock(&dev->se_port_lock); 1654 1655 if (!dest_tpg) { 1656 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1657 " dest_tpg\n"); 1658 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1659 ret = -EINVAL; 1660 goto out; 1661 } 1662 #if 0 1663 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1664 " tid_len: %d for %s + %s\n", 1665 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1666 tpdl, tid_len, i_str, iport_ptr); 1667 #endif 1668 if (tid_len > tpdl) { 1669 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1670 " %u for Transport ID: %s\n", tid_len, ptr); 1671 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1672 core_scsi3_tpg_undepend_item(dest_tpg); 1673 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1674 ret = -EINVAL; 1675 goto out; 1676 } 1677 /* 1678 * Locate the desintation struct se_dev_entry pointer for matching 1679 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1680 * Target Port. 1681 */ 1682 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1683 dest_rtpi); 1684 if (!dest_se_deve) { 1685 pr_err("Unable to locate %s dest_se_deve" 1686 " from destination RTPI: %hu\n", 1687 dest_tpg->se_tpg_tfo->get_fabric_name(), 1688 dest_rtpi); 1689 1690 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1691 core_scsi3_tpg_undepend_item(dest_tpg); 1692 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1693 ret = -EINVAL; 1694 goto out; 1695 } 1696 1697 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1698 if (ret < 0) { 1699 pr_err("core_scsi3_lunacl_depend_item()" 1700 " failed\n"); 1701 atomic_dec(&dest_se_deve->pr_ref_count); 1702 smp_mb__after_atomic_dec(); 1703 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1704 core_scsi3_tpg_undepend_item(dest_tpg); 1705 cmd->scsi_sense_reason = 1706 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1707 ret = -EINVAL; 1708 goto out; 1709 } 1710 #if 0 1711 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1712 " dest_se_deve mapped_lun: %u\n", 1713 dest_tpg->se_tpg_tfo->get_fabric_name(), 1714 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1715 #endif 1716 /* 1717 * Skip any TransportIDs that already have a registration for 1718 * this target port. 1719 */ 1720 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1721 iport_ptr); 1722 if (pr_reg_e) { 1723 core_scsi3_put_pr_reg(pr_reg_e); 1724 core_scsi3_lunacl_undepend_item(dest_se_deve); 1725 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1726 core_scsi3_tpg_undepend_item(dest_tpg); 1727 ptr += tid_len; 1728 tpdl -= tid_len; 1729 tid_len = 0; 1730 continue; 1731 } 1732 /* 1733 * Allocate a struct pr_transport_id_holder and setup 1734 * the dest_node_acl and dest_se_deve pointers for the 1735 * loop below. 1736 */ 1737 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1738 GFP_KERNEL); 1739 if (!tidh_new) { 1740 pr_err("Unable to allocate tidh_new\n"); 1741 core_scsi3_lunacl_undepend_item(dest_se_deve); 1742 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1743 core_scsi3_tpg_undepend_item(dest_tpg); 1744 cmd->scsi_sense_reason = 1745 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1746 ret = -ENOMEM; 1747 goto out; 1748 } 1749 INIT_LIST_HEAD(&tidh_new->dest_list); 1750 tidh_new->dest_tpg = dest_tpg; 1751 tidh_new->dest_node_acl = dest_node_acl; 1752 tidh_new->dest_se_deve = dest_se_deve; 1753 1754 /* 1755 * Allocate, but do NOT add the registration for the 1756 * TransportID referenced SCSI Initiator port. This 1757 * done because of the following from spc4r17 in section 1758 * 6.14.3 wrt SPEC_I_PT: 1759 * 1760 * "If a registration fails for any initiator port (e.g., if th 1761 * logical unit does not have enough resources available to 1762 * hold the registration information), no registrations shall be 1763 * made, and the command shall be terminated with 1764 * CHECK CONDITION status." 1765 * 1766 * That means we call __core_scsi3_alloc_registration() here, 1767 * and then call __core_scsi3_add_registration() in the 1768 * 2nd loop which will never fail. 1769 */ 1770 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1771 dest_node_acl, dest_se_deve, iport_ptr, 1772 sa_res_key, all_tg_pt, aptpl); 1773 if (!dest_pr_reg) { 1774 core_scsi3_lunacl_undepend_item(dest_se_deve); 1775 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1776 core_scsi3_tpg_undepend_item(dest_tpg); 1777 kfree(tidh_new); 1778 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1779 ret = -EINVAL; 1780 goto out; 1781 } 1782 tidh_new->dest_pr_reg = dest_pr_reg; 1783 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1784 1785 ptr += tid_len; 1786 tpdl -= tid_len; 1787 tid_len = 0; 1788 1789 } 1790 1791 transport_kunmap_first_data_page(cmd); 1792 1793 /* 1794 * Go ahead and create a registrations from tid_dest_list for the 1795 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1796 * and dest_se_deve. 1797 * 1798 * The SA Reservation Key from the PROUT is set for the 1799 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1800 * means that the TransportID Initiator port will be 1801 * registered on all of the target ports in the SCSI target device 1802 * ALL_TG_PT=0 means the registration will only be for the 1803 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1804 * was received. 1805 */ 1806 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1807 dest_tpg = tidh->dest_tpg; 1808 dest_node_acl = tidh->dest_node_acl; 1809 dest_se_deve = tidh->dest_se_deve; 1810 dest_pr_reg = tidh->dest_pr_reg; 1811 dest_local_nexus = tidh->dest_local_nexus; 1812 1813 list_del(&tidh->dest_list); 1814 kfree(tidh); 1815 1816 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1817 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1818 PR_REG_ISID_ID_LEN); 1819 1820 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1821 dest_pr_reg, 0, 0); 1822 1823 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1824 " registered Transport ID for Node: %s%s Mapped LUN:" 1825 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1826 dest_node_acl->initiatorname, (prf_isid) ? 1827 &i_buf[0] : "", dest_se_deve->mapped_lun); 1828 1829 if (dest_local_nexus) 1830 continue; 1831 1832 core_scsi3_lunacl_undepend_item(dest_se_deve); 1833 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1834 core_scsi3_tpg_undepend_item(dest_tpg); 1835 } 1836 1837 return 0; 1838 out: 1839 transport_kunmap_first_data_page(cmd); 1840 /* 1841 * For the failure case, release everything from tid_dest_list 1842 * including *dest_pr_reg and the configfs dependances.. 1843 */ 1844 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1845 dest_tpg = tidh->dest_tpg; 1846 dest_node_acl = tidh->dest_node_acl; 1847 dest_se_deve = tidh->dest_se_deve; 1848 dest_pr_reg = tidh->dest_pr_reg; 1849 dest_local_nexus = tidh->dest_local_nexus; 1850 1851 list_del(&tidh->dest_list); 1852 kfree(tidh); 1853 /* 1854 * Release any extra ALL_TG_PT=1 registrations for 1855 * the SPEC_I_PT=1 case. 1856 */ 1857 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1858 &dest_pr_reg->pr_reg_atp_list, 1859 pr_reg_atp_mem_list) { 1860 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1861 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1862 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1863 } 1864 1865 kfree(dest_pr_reg->pr_aptpl_buf); 1866 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1867 1868 if (dest_local_nexus) 1869 continue; 1870 1871 core_scsi3_lunacl_undepend_item(dest_se_deve); 1872 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1873 core_scsi3_tpg_undepend_item(dest_tpg); 1874 } 1875 return ret; 1876 } 1877 1878 /* 1879 * Called with struct se_device->dev_reservation_lock held 1880 */ 1881 static int __core_scsi3_update_aptpl_buf( 1882 struct se_device *dev, 1883 unsigned char *buf, 1884 u32 pr_aptpl_buf_len, 1885 int clear_aptpl_metadata) 1886 { 1887 struct se_lun *lun; 1888 struct se_portal_group *tpg; 1889 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1890 struct t10_pr_registration *pr_reg; 1891 unsigned char tmp[512], isid_buf[32]; 1892 ssize_t len = 0; 1893 int reg_count = 0; 1894 1895 memset(buf, 0, pr_aptpl_buf_len); 1896 /* 1897 * Called to clear metadata once APTPL has been deactivated. 1898 */ 1899 if (clear_aptpl_metadata) { 1900 snprintf(buf, pr_aptpl_buf_len, 1901 "No Registrations or Reservations\n"); 1902 return 0; 1903 } 1904 /* 1905 * Walk the registration list.. 1906 */ 1907 spin_lock(&su_dev->t10_pr.registration_lock); 1908 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1909 pr_reg_list) { 1910 1911 tmp[0] = '\0'; 1912 isid_buf[0] = '\0'; 1913 tpg = pr_reg->pr_reg_nacl->se_tpg; 1914 lun = pr_reg->pr_reg_tg_pt_lun; 1915 /* 1916 * Write out any ISID value to APTPL metadata that was included 1917 * in the original registration. 1918 */ 1919 if (pr_reg->isid_present_at_reg) 1920 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1921 pr_reg->pr_reg_isid); 1922 /* 1923 * Include special metadata if the pr_reg matches the 1924 * reservation holder. 1925 */ 1926 if (dev->dev_pr_res_holder == pr_reg) { 1927 snprintf(tmp, 512, "PR_REG_START: %d" 1928 "\ninitiator_fabric=%s\n" 1929 "initiator_node=%s\n%s" 1930 "sa_res_key=%llu\n" 1931 "res_holder=1\nres_type=%02x\n" 1932 "res_scope=%02x\nres_all_tg_pt=%d\n" 1933 "mapped_lun=%u\n", reg_count, 1934 tpg->se_tpg_tfo->get_fabric_name(), 1935 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1936 pr_reg->pr_res_key, pr_reg->pr_res_type, 1937 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1938 pr_reg->pr_res_mapped_lun); 1939 } else { 1940 snprintf(tmp, 512, "PR_REG_START: %d\n" 1941 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1942 "sa_res_key=%llu\nres_holder=0\n" 1943 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1944 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1945 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1946 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1947 pr_reg->pr_res_mapped_lun); 1948 } 1949 1950 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1951 pr_err("Unable to update renaming" 1952 " APTPL metadata\n"); 1953 spin_unlock(&su_dev->t10_pr.registration_lock); 1954 return -EMSGSIZE; 1955 } 1956 len += sprintf(buf+len, "%s", tmp); 1957 1958 /* 1959 * Include information about the associated SCSI target port. 1960 */ 1961 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1962 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1963 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1964 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1965 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1966 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1967 1968 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1969 pr_err("Unable to update renaming" 1970 " APTPL metadata\n"); 1971 spin_unlock(&su_dev->t10_pr.registration_lock); 1972 return -EMSGSIZE; 1973 } 1974 len += sprintf(buf+len, "%s", tmp); 1975 reg_count++; 1976 } 1977 spin_unlock(&su_dev->t10_pr.registration_lock); 1978 1979 if (!reg_count) 1980 len += sprintf(buf+len, "No Registrations or Reservations"); 1981 1982 return 0; 1983 } 1984 1985 static int core_scsi3_update_aptpl_buf( 1986 struct se_device *dev, 1987 unsigned char *buf, 1988 u32 pr_aptpl_buf_len, 1989 int clear_aptpl_metadata) 1990 { 1991 int ret; 1992 1993 spin_lock(&dev->dev_reservation_lock); 1994 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 1995 clear_aptpl_metadata); 1996 spin_unlock(&dev->dev_reservation_lock); 1997 1998 return ret; 1999 } 2000 2001 /* 2002 * Called with struct se_device->aptpl_file_mutex held 2003 */ 2004 static int __core_scsi3_write_aptpl_to_file( 2005 struct se_device *dev, 2006 unsigned char *buf, 2007 u32 pr_aptpl_buf_len) 2008 { 2009 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2010 struct file *file; 2011 struct iovec iov[1]; 2012 mm_segment_t old_fs; 2013 int flags = O_RDWR | O_CREAT | O_TRUNC; 2014 char path[512]; 2015 int ret; 2016 2017 memset(iov, 0, sizeof(struct iovec)); 2018 memset(path, 0, 512); 2019 2020 if (strlen(&wwn->unit_serial[0]) >= 512) { 2021 pr_err("WWN value for struct se_device does not fit" 2022 " into path buffer\n"); 2023 return -EMSGSIZE; 2024 } 2025 2026 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2027 file = filp_open(path, flags, 0600); 2028 if (IS_ERR(file) || !file || !file->f_dentry) { 2029 pr_err("filp_open(%s) for APTPL metadata" 2030 " failed\n", path); 2031 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT); 2032 } 2033 2034 iov[0].iov_base = &buf[0]; 2035 if (!pr_aptpl_buf_len) 2036 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2037 else 2038 iov[0].iov_len = pr_aptpl_buf_len; 2039 2040 old_fs = get_fs(); 2041 set_fs(get_ds()); 2042 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2043 set_fs(old_fs); 2044 2045 if (ret < 0) { 2046 pr_debug("Error writing APTPL metadata file: %s\n", path); 2047 filp_close(file, NULL); 2048 return -EIO; 2049 } 2050 filp_close(file, NULL); 2051 2052 return 0; 2053 } 2054 2055 static int core_scsi3_update_and_write_aptpl( 2056 struct se_device *dev, 2057 unsigned char *in_buf, 2058 u32 in_pr_aptpl_buf_len) 2059 { 2060 unsigned char null_buf[64], *buf; 2061 u32 pr_aptpl_buf_len; 2062 int ret, clear_aptpl_metadata = 0; 2063 /* 2064 * Can be called with a NULL pointer from PROUT service action CLEAR 2065 */ 2066 if (!in_buf) { 2067 memset(null_buf, 0, 64); 2068 buf = &null_buf[0]; 2069 /* 2070 * This will clear the APTPL metadata to: 2071 * "No Registrations or Reservations" status 2072 */ 2073 pr_aptpl_buf_len = 64; 2074 clear_aptpl_metadata = 1; 2075 } else { 2076 buf = in_buf; 2077 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2078 } 2079 2080 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2081 clear_aptpl_metadata); 2082 if (ret != 0) 2083 return ret; 2084 /* 2085 * __core_scsi3_write_aptpl_to_file() will call strlen() 2086 * on the passed buf to determine pr_aptpl_buf_len. 2087 */ 2088 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2089 if (ret != 0) 2090 return ret; 2091 2092 return ret; 2093 } 2094 2095 static int core_scsi3_emulate_pro_register( 2096 struct se_cmd *cmd, 2097 u64 res_key, 2098 u64 sa_res_key, 2099 int aptpl, 2100 int all_tg_pt, 2101 int spec_i_pt, 2102 int ignore_key) 2103 { 2104 struct se_session *se_sess = cmd->se_sess; 2105 struct se_device *dev = cmd->se_dev; 2106 struct se_dev_entry *se_deve; 2107 struct se_lun *se_lun = cmd->se_lun; 2108 struct se_portal_group *se_tpg; 2109 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2110 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2111 /* Used for APTPL metadata w/ UNREGISTER */ 2112 unsigned char *pr_aptpl_buf = NULL; 2113 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2114 int pr_holder = 0, ret = 0, type; 2115 2116 if (!se_sess || !se_lun) { 2117 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2118 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2119 return -EINVAL; 2120 } 2121 se_tpg = se_sess->se_tpg; 2122 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2123 2124 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2125 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2126 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2127 PR_REG_ISID_LEN); 2128 isid_ptr = &isid_buf[0]; 2129 } 2130 /* 2131 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2132 */ 2133 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2134 if (!pr_reg_e) { 2135 if (res_key) { 2136 pr_warn("SPC-3 PR: Reservation Key non-zero" 2137 " for SA REGISTER, returning CONFLICT\n"); 2138 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2139 return -EINVAL; 2140 } 2141 /* 2142 * Do nothing but return GOOD status. 2143 */ 2144 if (!sa_res_key) 2145 return 0; 2146 2147 if (!spec_i_pt) { 2148 /* 2149 * Perform the Service Action REGISTER on the Initiator 2150 * Port Endpoint that the PRO was received from on the 2151 * Logical Unit of the SCSI device server. 2152 */ 2153 ret = core_scsi3_alloc_registration(cmd->se_dev, 2154 se_sess->se_node_acl, se_deve, isid_ptr, 2155 sa_res_key, all_tg_pt, aptpl, 2156 ignore_key, 0); 2157 if (ret != 0) { 2158 pr_err("Unable to allocate" 2159 " struct t10_pr_registration\n"); 2160 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2161 return -EINVAL; 2162 } 2163 } else { 2164 /* 2165 * Register both the Initiator port that received 2166 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2167 * TransportID from Parameter list and loop through 2168 * fabric dependent parameter list while calling 2169 * logic from of core_scsi3_alloc_registration() for 2170 * each TransportID provided SCSI Initiator Port/Device 2171 */ 2172 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2173 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2174 if (ret != 0) 2175 return ret; 2176 } 2177 /* 2178 * Nothing left to do for the APTPL=0 case. 2179 */ 2180 if (!aptpl) { 2181 pr_tmpl->pr_aptpl_active = 0; 2182 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2183 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2184 " REGISTER\n"); 2185 return 0; 2186 } 2187 /* 2188 * Locate the newly allocated local I_T Nexus *pr_reg, and 2189 * update the APTPL metadata information using its 2190 * preallocated *pr_reg->pr_aptpl_buf. 2191 */ 2192 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2193 se_sess->se_node_acl, se_sess); 2194 2195 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2196 &pr_reg->pr_aptpl_buf[0], 2197 pr_tmpl->pr_aptpl_buf_len); 2198 if (!ret) { 2199 pr_tmpl->pr_aptpl_active = 1; 2200 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2201 } 2202 2203 core_scsi3_put_pr_reg(pr_reg); 2204 return ret; 2205 } else { 2206 /* 2207 * Locate the existing *pr_reg via struct se_node_acl pointers 2208 */ 2209 pr_reg = pr_reg_e; 2210 type = pr_reg->pr_res_type; 2211 2212 if (!ignore_key) { 2213 if (res_key != pr_reg->pr_res_key) { 2214 pr_err("SPC-3 PR REGISTER: Received" 2215 " res_key: 0x%016Lx does not match" 2216 " existing SA REGISTER res_key:" 2217 " 0x%016Lx\n", res_key, 2218 pr_reg->pr_res_key); 2219 core_scsi3_put_pr_reg(pr_reg); 2220 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2221 return -EINVAL; 2222 } 2223 } 2224 if (spec_i_pt) { 2225 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2226 " set while sa_res_key=0\n"); 2227 core_scsi3_put_pr_reg(pr_reg); 2228 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2229 return -EINVAL; 2230 } 2231 /* 2232 * An existing ALL_TG_PT=1 registration being released 2233 * must also set ALL_TG_PT=1 in the incoming PROUT. 2234 */ 2235 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2236 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2237 " registration exists, but ALL_TG_PT=1 bit not" 2238 " present in received PROUT\n"); 2239 core_scsi3_put_pr_reg(pr_reg); 2240 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2241 return -EINVAL; 2242 } 2243 /* 2244 * Allocate APTPL metadata buffer used for UNREGISTER ops 2245 */ 2246 if (aptpl) { 2247 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2248 GFP_KERNEL); 2249 if (!pr_aptpl_buf) { 2250 pr_err("Unable to allocate" 2251 " pr_aptpl_buf\n"); 2252 core_scsi3_put_pr_reg(pr_reg); 2253 cmd->scsi_sense_reason = 2254 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2255 return -EINVAL; 2256 } 2257 } 2258 /* 2259 * sa_res_key=0 Unregister Reservation Key for registered I_T 2260 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2261 * Nexus. 2262 */ 2263 if (!sa_res_key) { 2264 pr_holder = core_scsi3_check_implict_release( 2265 cmd->se_dev, pr_reg); 2266 if (pr_holder < 0) { 2267 kfree(pr_aptpl_buf); 2268 core_scsi3_put_pr_reg(pr_reg); 2269 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2270 return -EINVAL; 2271 } 2272 2273 spin_lock(&pr_tmpl->registration_lock); 2274 /* 2275 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2276 * and matching pr_res_key. 2277 */ 2278 if (pr_reg->pr_reg_all_tg_pt) { 2279 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2280 &pr_tmpl->registration_list, 2281 pr_reg_list) { 2282 2283 if (!pr_reg_p->pr_reg_all_tg_pt) 2284 continue; 2285 2286 if (pr_reg_p->pr_res_key != res_key) 2287 continue; 2288 2289 if (pr_reg == pr_reg_p) 2290 continue; 2291 2292 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2293 pr_reg_p->pr_reg_nacl->initiatorname)) 2294 continue; 2295 2296 __core_scsi3_free_registration(dev, 2297 pr_reg_p, NULL, 0); 2298 } 2299 } 2300 /* 2301 * Release the calling I_T Nexus registration now.. 2302 */ 2303 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2304 NULL, 1); 2305 /* 2306 * From spc4r17, section 5.7.11.3 Unregistering 2307 * 2308 * If the persistent reservation is a registrants only 2309 * type, the device server shall establish a unit 2310 * attention condition for the initiator port associated 2311 * with every registered I_T nexus except for the I_T 2312 * nexus on which the PERSISTENT RESERVE OUT command was 2313 * received, with the additional sense code set to 2314 * RESERVATIONS RELEASED. 2315 */ 2316 if (pr_holder && 2317 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2318 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2319 list_for_each_entry(pr_reg_p, 2320 &pr_tmpl->registration_list, 2321 pr_reg_list) { 2322 2323 core_scsi3_ua_allocate( 2324 pr_reg_p->pr_reg_nacl, 2325 pr_reg_p->pr_res_mapped_lun, 2326 0x2A, 2327 ASCQ_2AH_RESERVATIONS_RELEASED); 2328 } 2329 } 2330 spin_unlock(&pr_tmpl->registration_lock); 2331 2332 if (!aptpl) { 2333 pr_tmpl->pr_aptpl_active = 0; 2334 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2335 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2336 " for UNREGISTER\n"); 2337 return 0; 2338 } 2339 2340 ret = core_scsi3_update_and_write_aptpl(dev, 2341 &pr_aptpl_buf[0], 2342 pr_tmpl->pr_aptpl_buf_len); 2343 if (!ret) { 2344 pr_tmpl->pr_aptpl_active = 1; 2345 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2346 " for UNREGISTER\n"); 2347 } 2348 2349 kfree(pr_aptpl_buf); 2350 return ret; 2351 } else { 2352 /* 2353 * Increment PRgeneration counter for struct se_device" 2354 * upon a successful REGISTER, see spc4r17 section 6.3.2 2355 * READ_KEYS service action. 2356 */ 2357 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2358 cmd->se_dev); 2359 pr_reg->pr_res_key = sa_res_key; 2360 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2361 " Key for %s to: 0x%016Lx PRgeneration:" 2362 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2363 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2364 pr_reg->pr_reg_nacl->initiatorname, 2365 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2366 2367 if (!aptpl) { 2368 pr_tmpl->pr_aptpl_active = 0; 2369 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2370 core_scsi3_put_pr_reg(pr_reg); 2371 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2372 " for REGISTER\n"); 2373 return 0; 2374 } 2375 2376 ret = core_scsi3_update_and_write_aptpl(dev, 2377 &pr_aptpl_buf[0], 2378 pr_tmpl->pr_aptpl_buf_len); 2379 if (!ret) { 2380 pr_tmpl->pr_aptpl_active = 1; 2381 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2382 " for REGISTER\n"); 2383 } 2384 2385 kfree(pr_aptpl_buf); 2386 core_scsi3_put_pr_reg(pr_reg); 2387 } 2388 } 2389 return 0; 2390 } 2391 2392 unsigned char *core_scsi3_pr_dump_type(int type) 2393 { 2394 switch (type) { 2395 case PR_TYPE_WRITE_EXCLUSIVE: 2396 return "Write Exclusive Access"; 2397 case PR_TYPE_EXCLUSIVE_ACCESS: 2398 return "Exclusive Access"; 2399 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2400 return "Write Exclusive Access, Registrants Only"; 2401 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2402 return "Exclusive Access, Registrants Only"; 2403 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2404 return "Write Exclusive Access, All Registrants"; 2405 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2406 return "Exclusive Access, All Registrants"; 2407 default: 2408 break; 2409 } 2410 2411 return "Unknown SPC-3 PR Type"; 2412 } 2413 2414 static int core_scsi3_pro_reserve( 2415 struct se_cmd *cmd, 2416 struct se_device *dev, 2417 int type, 2418 int scope, 2419 u64 res_key) 2420 { 2421 struct se_session *se_sess = cmd->se_sess; 2422 struct se_dev_entry *se_deve; 2423 struct se_lun *se_lun = cmd->se_lun; 2424 struct se_portal_group *se_tpg; 2425 struct t10_pr_registration *pr_reg, *pr_res_holder; 2426 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2427 char i_buf[PR_REG_ISID_ID_LEN]; 2428 int ret, prf_isid; 2429 2430 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2431 2432 if (!se_sess || !se_lun) { 2433 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2434 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2435 return -EINVAL; 2436 } 2437 se_tpg = se_sess->se_tpg; 2438 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2439 /* 2440 * Locate the existing *pr_reg via struct se_node_acl pointers 2441 */ 2442 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2443 se_sess); 2444 if (!pr_reg) { 2445 pr_err("SPC-3 PR: Unable to locate" 2446 " PR_REGISTERED *pr_reg for RESERVE\n"); 2447 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2448 return -EINVAL; 2449 } 2450 /* 2451 * From spc4r17 Section 5.7.9: Reserving: 2452 * 2453 * An application client creates a persistent reservation by issuing 2454 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2455 * a registered I_T nexus with the following parameters: 2456 * a) RESERVATION KEY set to the value of the reservation key that is 2457 * registered with the logical unit for the I_T nexus; and 2458 */ 2459 if (res_key != pr_reg->pr_res_key) { 2460 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2461 " does not match existing SA REGISTER res_key:" 2462 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2463 core_scsi3_put_pr_reg(pr_reg); 2464 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2465 return -EINVAL; 2466 } 2467 /* 2468 * From spc4r17 Section 5.7.9: Reserving: 2469 * 2470 * From above: 2471 * b) TYPE field and SCOPE field set to the persistent reservation 2472 * being created. 2473 * 2474 * Only one persistent reservation is allowed at a time per logical unit 2475 * and that persistent reservation has a scope of LU_SCOPE. 2476 */ 2477 if (scope != PR_SCOPE_LU_SCOPE) { 2478 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2479 core_scsi3_put_pr_reg(pr_reg); 2480 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2481 return -EINVAL; 2482 } 2483 /* 2484 * See if we have an existing PR reservation holder pointer at 2485 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2486 * *pr_res_holder. 2487 */ 2488 spin_lock(&dev->dev_reservation_lock); 2489 pr_res_holder = dev->dev_pr_res_holder; 2490 if ((pr_res_holder)) { 2491 /* 2492 * From spc4r17 Section 5.7.9: Reserving: 2493 * 2494 * If the device server receives a PERSISTENT RESERVE OUT 2495 * command from an I_T nexus other than a persistent reservation 2496 * holder (see 5.7.10) that attempts to create a persistent 2497 * reservation when a persistent reservation already exists for 2498 * the logical unit, then the command shall be completed with 2499 * RESERVATION CONFLICT status. 2500 */ 2501 if (pr_res_holder != pr_reg) { 2502 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2503 pr_err("SPC-3 PR: Attempted RESERVE from" 2504 " [%s]: %s while reservation already held by" 2505 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2506 cmd->se_tfo->get_fabric_name(), 2507 se_sess->se_node_acl->initiatorname, 2508 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2509 pr_res_holder->pr_reg_nacl->initiatorname); 2510 2511 spin_unlock(&dev->dev_reservation_lock); 2512 core_scsi3_put_pr_reg(pr_reg); 2513 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2514 return -EINVAL; 2515 } 2516 /* 2517 * From spc4r17 Section 5.7.9: Reserving: 2518 * 2519 * If a persistent reservation holder attempts to modify the 2520 * type or scope of an existing persistent reservation, the 2521 * command shall be completed with RESERVATION CONFLICT status. 2522 */ 2523 if ((pr_res_holder->pr_res_type != type) || 2524 (pr_res_holder->pr_res_scope != scope)) { 2525 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2526 pr_err("SPC-3 PR: Attempted RESERVE from" 2527 " [%s]: %s trying to change TYPE and/or SCOPE," 2528 " while reservation already held by [%s]: %s," 2529 " returning RESERVATION_CONFLICT\n", 2530 cmd->se_tfo->get_fabric_name(), 2531 se_sess->se_node_acl->initiatorname, 2532 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2533 pr_res_holder->pr_reg_nacl->initiatorname); 2534 2535 spin_unlock(&dev->dev_reservation_lock); 2536 core_scsi3_put_pr_reg(pr_reg); 2537 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2538 return -EINVAL; 2539 } 2540 /* 2541 * From spc4r17 Section 5.7.9: Reserving: 2542 * 2543 * If the device server receives a PERSISTENT RESERVE OUT 2544 * command with RESERVE service action where the TYPE field and 2545 * the SCOPE field contain the same values as the existing type 2546 * and scope from a persistent reservation holder, it shall not 2547 * make any change to the existing persistent reservation and 2548 * shall completethe command with GOOD status. 2549 */ 2550 spin_unlock(&dev->dev_reservation_lock); 2551 core_scsi3_put_pr_reg(pr_reg); 2552 return 0; 2553 } 2554 /* 2555 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2556 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2557 */ 2558 pr_reg->pr_res_scope = scope; 2559 pr_reg->pr_res_type = type; 2560 pr_reg->pr_res_holder = 1; 2561 dev->dev_pr_res_holder = pr_reg; 2562 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2563 PR_REG_ISID_ID_LEN); 2564 2565 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2566 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2567 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2568 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2569 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2570 cmd->se_tfo->get_fabric_name(), 2571 se_sess->se_node_acl->initiatorname, 2572 (prf_isid) ? &i_buf[0] : ""); 2573 spin_unlock(&dev->dev_reservation_lock); 2574 2575 if (pr_tmpl->pr_aptpl_active) { 2576 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2577 &pr_reg->pr_aptpl_buf[0], 2578 pr_tmpl->pr_aptpl_buf_len); 2579 if (!ret) 2580 pr_debug("SPC-3 PR: Updated APTPL metadata" 2581 " for RESERVE\n"); 2582 } 2583 2584 core_scsi3_put_pr_reg(pr_reg); 2585 return 0; 2586 } 2587 2588 static int core_scsi3_emulate_pro_reserve( 2589 struct se_cmd *cmd, 2590 int type, 2591 int scope, 2592 u64 res_key) 2593 { 2594 struct se_device *dev = cmd->se_dev; 2595 int ret = 0; 2596 2597 switch (type) { 2598 case PR_TYPE_WRITE_EXCLUSIVE: 2599 case PR_TYPE_EXCLUSIVE_ACCESS: 2600 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2601 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2602 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2603 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2604 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2605 break; 2606 default: 2607 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2608 " 0x%02x\n", type); 2609 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2610 return -EINVAL; 2611 } 2612 2613 return ret; 2614 } 2615 2616 /* 2617 * Called with struct se_device->dev_reservation_lock held. 2618 */ 2619 static void __core_scsi3_complete_pro_release( 2620 struct se_device *dev, 2621 struct se_node_acl *se_nacl, 2622 struct t10_pr_registration *pr_reg, 2623 int explict) 2624 { 2625 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2626 char i_buf[PR_REG_ISID_ID_LEN]; 2627 int prf_isid; 2628 2629 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2630 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2631 PR_REG_ISID_ID_LEN); 2632 /* 2633 * Go ahead and release the current PR reservation holder. 2634 */ 2635 dev->dev_pr_res_holder = NULL; 2636 2637 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2638 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2639 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2640 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2641 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2642 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2643 tfo->get_fabric_name(), se_nacl->initiatorname, 2644 (prf_isid) ? &i_buf[0] : ""); 2645 /* 2646 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2647 */ 2648 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2649 } 2650 2651 static int core_scsi3_emulate_pro_release( 2652 struct se_cmd *cmd, 2653 int type, 2654 int scope, 2655 u64 res_key) 2656 { 2657 struct se_device *dev = cmd->se_dev; 2658 struct se_session *se_sess = cmd->se_sess; 2659 struct se_lun *se_lun = cmd->se_lun; 2660 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2661 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2662 int ret, all_reg = 0; 2663 2664 if (!se_sess || !se_lun) { 2665 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2666 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2667 return -EINVAL; 2668 } 2669 /* 2670 * Locate the existing *pr_reg via struct se_node_acl pointers 2671 */ 2672 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2673 if (!pr_reg) { 2674 pr_err("SPC-3 PR: Unable to locate" 2675 " PR_REGISTERED *pr_reg for RELEASE\n"); 2676 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2677 return -EINVAL; 2678 } 2679 /* 2680 * From spc4r17 Section 5.7.11.2 Releasing: 2681 * 2682 * If there is no persistent reservation or in response to a persistent 2683 * reservation release request from a registered I_T nexus that is not a 2684 * persistent reservation holder (see 5.7.10), the device server shall 2685 * do the following: 2686 * 2687 * a) Not release the persistent reservation, if any; 2688 * b) Not remove any registrations; and 2689 * c) Complete the command with GOOD status. 2690 */ 2691 spin_lock(&dev->dev_reservation_lock); 2692 pr_res_holder = dev->dev_pr_res_holder; 2693 if (!pr_res_holder) { 2694 /* 2695 * No persistent reservation, return GOOD status. 2696 */ 2697 spin_unlock(&dev->dev_reservation_lock); 2698 core_scsi3_put_pr_reg(pr_reg); 2699 return 0; 2700 } 2701 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2702 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2703 all_reg = 1; 2704 2705 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2706 /* 2707 * Non 'All Registrants' PR Type cases.. 2708 * Release request from a registered I_T nexus that is not a 2709 * persistent reservation holder. return GOOD status. 2710 */ 2711 spin_unlock(&dev->dev_reservation_lock); 2712 core_scsi3_put_pr_reg(pr_reg); 2713 return 0; 2714 } 2715 /* 2716 * From spc4r17 Section 5.7.11.2 Releasing: 2717 * 2718 * Only the persistent reservation holder (see 5.7.10) is allowed to 2719 * release a persistent reservation. 2720 * 2721 * An application client releases the persistent reservation by issuing 2722 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2723 * an I_T nexus that is a persistent reservation holder with the 2724 * following parameters: 2725 * 2726 * a) RESERVATION KEY field set to the value of the reservation key 2727 * that is registered with the logical unit for the I_T nexus; 2728 */ 2729 if (res_key != pr_reg->pr_res_key) { 2730 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2731 " does not match existing SA REGISTER res_key:" 2732 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2733 spin_unlock(&dev->dev_reservation_lock); 2734 core_scsi3_put_pr_reg(pr_reg); 2735 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2736 return -EINVAL; 2737 } 2738 /* 2739 * From spc4r17 Section 5.7.11.2 Releasing and above: 2740 * 2741 * b) TYPE field and SCOPE field set to match the persistent 2742 * reservation being released. 2743 */ 2744 if ((pr_res_holder->pr_res_type != type) || 2745 (pr_res_holder->pr_res_scope != scope)) { 2746 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2747 pr_err("SPC-3 PR RELEASE: Attempted to release" 2748 " reservation from [%s]: %s with different TYPE " 2749 "and/or SCOPE while reservation already held by" 2750 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2751 cmd->se_tfo->get_fabric_name(), 2752 se_sess->se_node_acl->initiatorname, 2753 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2754 pr_res_holder->pr_reg_nacl->initiatorname); 2755 2756 spin_unlock(&dev->dev_reservation_lock); 2757 core_scsi3_put_pr_reg(pr_reg); 2758 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2759 return -EINVAL; 2760 } 2761 /* 2762 * In response to a persistent reservation release request from the 2763 * persistent reservation holder the device server shall perform a 2764 * release by doing the following as an uninterrupted series of actions: 2765 * a) Release the persistent reservation; 2766 * b) Not remove any registration(s); 2767 * c) If the released persistent reservation is a registrants only type 2768 * or all registrants type persistent reservation, 2769 * the device server shall establish a unit attention condition for 2770 * the initiator port associated with every regis- 2771 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2772 * RESERVE OUT command with RELEASE service action was received, 2773 * with the additional sense code set to RESERVATIONS RELEASED; and 2774 * d) If the persistent reservation is of any other type, the device 2775 * server shall not establish a unit attention condition. 2776 */ 2777 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2778 pr_reg, 1); 2779 2780 spin_unlock(&dev->dev_reservation_lock); 2781 2782 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2783 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2784 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2785 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2786 /* 2787 * If no UNIT ATTENTION conditions will be established for 2788 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2789 * go ahead and check for APTPL=1 update+write below 2790 */ 2791 goto write_aptpl; 2792 } 2793 2794 spin_lock(&pr_tmpl->registration_lock); 2795 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2796 pr_reg_list) { 2797 /* 2798 * Do not establish a UNIT ATTENTION condition 2799 * for the calling I_T Nexus 2800 */ 2801 if (pr_reg_p == pr_reg) 2802 continue; 2803 2804 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2805 pr_reg_p->pr_res_mapped_lun, 2806 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2807 } 2808 spin_unlock(&pr_tmpl->registration_lock); 2809 2810 write_aptpl: 2811 if (pr_tmpl->pr_aptpl_active) { 2812 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2813 &pr_reg->pr_aptpl_buf[0], 2814 pr_tmpl->pr_aptpl_buf_len); 2815 if (!ret) 2816 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2817 } 2818 2819 core_scsi3_put_pr_reg(pr_reg); 2820 return 0; 2821 } 2822 2823 static int core_scsi3_emulate_pro_clear( 2824 struct se_cmd *cmd, 2825 u64 res_key) 2826 { 2827 struct se_device *dev = cmd->se_dev; 2828 struct se_node_acl *pr_reg_nacl; 2829 struct se_session *se_sess = cmd->se_sess; 2830 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2831 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2832 u32 pr_res_mapped_lun = 0; 2833 int calling_it_nexus = 0; 2834 /* 2835 * Locate the existing *pr_reg via struct se_node_acl pointers 2836 */ 2837 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2838 se_sess->se_node_acl, se_sess); 2839 if (!pr_reg_n) { 2840 pr_err("SPC-3 PR: Unable to locate" 2841 " PR_REGISTERED *pr_reg for CLEAR\n"); 2842 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2843 return -EINVAL; 2844 } 2845 /* 2846 * From spc4r17 section 5.7.11.6, Clearing: 2847 * 2848 * Any application client may release the persistent reservation and 2849 * remove all registrations from a device server by issuing a 2850 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2851 * registered I_T nexus with the following parameter: 2852 * 2853 * a) RESERVATION KEY field set to the value of the reservation key 2854 * that is registered with the logical unit for the I_T nexus. 2855 */ 2856 if (res_key != pr_reg_n->pr_res_key) { 2857 pr_err("SPC-3 PR REGISTER: Received" 2858 " res_key: 0x%016Lx does not match" 2859 " existing SA REGISTER res_key:" 2860 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2861 core_scsi3_put_pr_reg(pr_reg_n); 2862 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2863 return -EINVAL; 2864 } 2865 /* 2866 * a) Release the persistent reservation, if any; 2867 */ 2868 spin_lock(&dev->dev_reservation_lock); 2869 pr_res_holder = dev->dev_pr_res_holder; 2870 if (pr_res_holder) { 2871 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2872 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2873 pr_res_holder, 0); 2874 } 2875 spin_unlock(&dev->dev_reservation_lock); 2876 /* 2877 * b) Remove all registration(s) (see spc4r17 5.7.7); 2878 */ 2879 spin_lock(&pr_tmpl->registration_lock); 2880 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2881 &pr_tmpl->registration_list, pr_reg_list) { 2882 2883 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2884 pr_reg_nacl = pr_reg->pr_reg_nacl; 2885 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2886 __core_scsi3_free_registration(dev, pr_reg, NULL, 2887 calling_it_nexus); 2888 /* 2889 * e) Establish a unit attention condition for the initiator 2890 * port associated with every registered I_T nexus other 2891 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2892 * command with CLEAR service action was received, with the 2893 * additional sense code set to RESERVATIONS PREEMPTED. 2894 */ 2895 if (!calling_it_nexus) 2896 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2897 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2898 } 2899 spin_unlock(&pr_tmpl->registration_lock); 2900 2901 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2902 cmd->se_tfo->get_fabric_name()); 2903 2904 if (pr_tmpl->pr_aptpl_active) { 2905 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2906 pr_debug("SPC-3 PR: Updated APTPL metadata" 2907 " for CLEAR\n"); 2908 } 2909 2910 core_scsi3_pr_generation(dev); 2911 return 0; 2912 } 2913 2914 /* 2915 * Called with struct se_device->dev_reservation_lock held. 2916 */ 2917 static void __core_scsi3_complete_pro_preempt( 2918 struct se_device *dev, 2919 struct t10_pr_registration *pr_reg, 2920 struct list_head *preempt_and_abort_list, 2921 int type, 2922 int scope, 2923 int abort) 2924 { 2925 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2926 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2927 char i_buf[PR_REG_ISID_ID_LEN]; 2928 int prf_isid; 2929 2930 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2931 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2932 PR_REG_ISID_ID_LEN); 2933 /* 2934 * Do an implict RELEASE of the existing reservation. 2935 */ 2936 if (dev->dev_pr_res_holder) 2937 __core_scsi3_complete_pro_release(dev, nacl, 2938 dev->dev_pr_res_holder, 0); 2939 2940 dev->dev_pr_res_holder = pr_reg; 2941 pr_reg->pr_res_holder = 1; 2942 pr_reg->pr_res_type = type; 2943 pr_reg->pr_res_scope = scope; 2944 2945 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2946 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2947 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2948 core_scsi3_pr_dump_type(type), 2949 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2950 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2951 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2952 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2953 /* 2954 * For PREEMPT_AND_ABORT, add the preempting reservation's 2955 * struct t10_pr_registration to the list that will be compared 2956 * against received CDBs.. 2957 */ 2958 if (preempt_and_abort_list) 2959 list_add_tail(&pr_reg->pr_reg_abort_list, 2960 preempt_and_abort_list); 2961 } 2962 2963 static void core_scsi3_release_preempt_and_abort( 2964 struct list_head *preempt_and_abort_list, 2965 struct t10_pr_registration *pr_reg_holder) 2966 { 2967 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2968 2969 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2970 pr_reg_abort_list) { 2971 2972 list_del(&pr_reg->pr_reg_abort_list); 2973 if (pr_reg_holder == pr_reg) 2974 continue; 2975 if (pr_reg->pr_res_holder) { 2976 pr_warn("pr_reg->pr_res_holder still set\n"); 2977 continue; 2978 } 2979 2980 pr_reg->pr_reg_deve = NULL; 2981 pr_reg->pr_reg_nacl = NULL; 2982 kfree(pr_reg->pr_aptpl_buf); 2983 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2984 } 2985 } 2986 2987 int core_scsi3_check_cdb_abort_and_preempt( 2988 struct list_head *preempt_and_abort_list, 2989 struct se_cmd *cmd) 2990 { 2991 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2992 2993 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2994 pr_reg_abort_list) { 2995 if (pr_reg->pr_res_key == cmd->pr_res_key) 2996 return 0; 2997 } 2998 2999 return 1; 3000 } 3001 3002 static int core_scsi3_pro_preempt( 3003 struct se_cmd *cmd, 3004 int type, 3005 int scope, 3006 u64 res_key, 3007 u64 sa_res_key, 3008 int abort) 3009 { 3010 struct se_device *dev = cmd->se_dev; 3011 struct se_dev_entry *se_deve; 3012 struct se_node_acl *pr_reg_nacl; 3013 struct se_session *se_sess = cmd->se_sess; 3014 struct list_head preempt_and_abort_list; 3015 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 3016 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3017 u32 pr_res_mapped_lun = 0; 3018 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3019 int prh_type = 0, prh_scope = 0, ret; 3020 3021 if (!se_sess) { 3022 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3023 return -EINVAL; 3024 } 3025 3026 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3027 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3028 se_sess); 3029 if (!pr_reg_n) { 3030 pr_err("SPC-3 PR: Unable to locate" 3031 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3032 (abort) ? "_AND_ABORT" : ""); 3033 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3034 return -EINVAL; 3035 } 3036 if (pr_reg_n->pr_res_key != res_key) { 3037 core_scsi3_put_pr_reg(pr_reg_n); 3038 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3039 return -EINVAL; 3040 } 3041 if (scope != PR_SCOPE_LU_SCOPE) { 3042 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3043 core_scsi3_put_pr_reg(pr_reg_n); 3044 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3045 return -EINVAL; 3046 } 3047 INIT_LIST_HEAD(&preempt_and_abort_list); 3048 3049 spin_lock(&dev->dev_reservation_lock); 3050 pr_res_holder = dev->dev_pr_res_holder; 3051 if (pr_res_holder && 3052 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3053 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3054 all_reg = 1; 3055 3056 if (!all_reg && !sa_res_key) { 3057 spin_unlock(&dev->dev_reservation_lock); 3058 core_scsi3_put_pr_reg(pr_reg_n); 3059 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3060 return -EINVAL; 3061 } 3062 /* 3063 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3064 * 3065 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3066 * persistent reservation holder or there is no persistent reservation 3067 * holder (i.e., there is no persistent reservation), then the device 3068 * server shall perform a preempt by doing the following in an 3069 * uninterrupted series of actions. (See below..) 3070 */ 3071 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3072 /* 3073 * No existing or SA Reservation Key matching reservations.. 3074 * 3075 * PROUT SA PREEMPT with All Registrant type reservations are 3076 * allowed to be processed without a matching SA Reservation Key 3077 */ 3078 spin_lock(&pr_tmpl->registration_lock); 3079 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3080 &pr_tmpl->registration_list, pr_reg_list) { 3081 /* 3082 * Removing of registrations in non all registrants 3083 * type reservations without a matching SA reservation 3084 * key. 3085 * 3086 * a) Remove the registrations for all I_T nexuses 3087 * specified by the SERVICE ACTION RESERVATION KEY 3088 * field; 3089 * b) Ignore the contents of the SCOPE and TYPE fields; 3090 * c) Process tasks as defined in 5.7.1; and 3091 * d) Establish a unit attention condition for the 3092 * initiator port associated with every I_T nexus 3093 * that lost its registration other than the I_T 3094 * nexus on which the PERSISTENT RESERVE OUT command 3095 * was received, with the additional sense code set 3096 * to REGISTRATIONS PREEMPTED. 3097 */ 3098 if (!all_reg) { 3099 if (pr_reg->pr_res_key != sa_res_key) 3100 continue; 3101 3102 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3103 pr_reg_nacl = pr_reg->pr_reg_nacl; 3104 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3105 __core_scsi3_free_registration(dev, pr_reg, 3106 (abort) ? &preempt_and_abort_list : 3107 NULL, calling_it_nexus); 3108 released_regs++; 3109 } else { 3110 /* 3111 * Case for any existing all registrants type 3112 * reservation, follow logic in spc4r17 section 3113 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3114 * 3115 * For a ZERO SA Reservation key, release 3116 * all other registrations and do an implict 3117 * release of active persistent reservation. 3118 * 3119 * For a non-ZERO SA Reservation key, only 3120 * release the matching reservation key from 3121 * registrations. 3122 */ 3123 if ((sa_res_key) && 3124 (pr_reg->pr_res_key != sa_res_key)) 3125 continue; 3126 3127 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3128 if (calling_it_nexus) 3129 continue; 3130 3131 pr_reg_nacl = pr_reg->pr_reg_nacl; 3132 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3133 __core_scsi3_free_registration(dev, pr_reg, 3134 (abort) ? &preempt_and_abort_list : 3135 NULL, 0); 3136 released_regs++; 3137 } 3138 if (!calling_it_nexus) 3139 core_scsi3_ua_allocate(pr_reg_nacl, 3140 pr_res_mapped_lun, 0x2A, 3141 ASCQ_2AH_RESERVATIONS_PREEMPTED); 3142 } 3143 spin_unlock(&pr_tmpl->registration_lock); 3144 /* 3145 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3146 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3147 * RESERVATION KEY field to a value that does not match any 3148 * registered reservation key, then the device server shall 3149 * complete the command with RESERVATION CONFLICT status. 3150 */ 3151 if (!released_regs) { 3152 spin_unlock(&dev->dev_reservation_lock); 3153 core_scsi3_put_pr_reg(pr_reg_n); 3154 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3155 return -EINVAL; 3156 } 3157 /* 3158 * For an existing all registrants type reservation 3159 * with a zero SA rservation key, preempt the existing 3160 * reservation with the new PR type and scope. 3161 */ 3162 if (pr_res_holder && all_reg && !(sa_res_key)) { 3163 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3164 (abort) ? &preempt_and_abort_list : NULL, 3165 type, scope, abort); 3166 3167 if (abort) 3168 core_scsi3_release_preempt_and_abort( 3169 &preempt_and_abort_list, pr_reg_n); 3170 } 3171 spin_unlock(&dev->dev_reservation_lock); 3172 3173 if (pr_tmpl->pr_aptpl_active) { 3174 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3175 &pr_reg_n->pr_aptpl_buf[0], 3176 pr_tmpl->pr_aptpl_buf_len); 3177 if (!ret) 3178 pr_debug("SPC-3 PR: Updated APTPL" 3179 " metadata for PREEMPT%s\n", (abort) ? 3180 "_AND_ABORT" : ""); 3181 } 3182 3183 core_scsi3_put_pr_reg(pr_reg_n); 3184 core_scsi3_pr_generation(cmd->se_dev); 3185 return 0; 3186 } 3187 /* 3188 * The PREEMPTing SA reservation key matches that of the 3189 * existing persistent reservation, first, we check if 3190 * we are preempting our own reservation. 3191 * From spc4r17, section 5.7.11.4.3 Preempting 3192 * persistent reservations and registration handling 3193 * 3194 * If an all registrants persistent reservation is not 3195 * present, it is not an error for the persistent 3196 * reservation holder to preempt itself (i.e., a 3197 * PERSISTENT RESERVE OUT with a PREEMPT service action 3198 * or a PREEMPT AND ABORT service action with the 3199 * SERVICE ACTION RESERVATION KEY value equal to the 3200 * persistent reservation holder's reservation key that 3201 * is received from the persistent reservation holder). 3202 * In that case, the device server shall establish the 3203 * new persistent reservation and maintain the 3204 * registration. 3205 */ 3206 prh_type = pr_res_holder->pr_res_type; 3207 prh_scope = pr_res_holder->pr_res_scope; 3208 /* 3209 * If the SERVICE ACTION RESERVATION KEY field identifies a 3210 * persistent reservation holder (see 5.7.10), the device 3211 * server shall perform a preempt by doing the following as 3212 * an uninterrupted series of actions: 3213 * 3214 * a) Release the persistent reservation for the holder 3215 * identified by the SERVICE ACTION RESERVATION KEY field; 3216 */ 3217 if (pr_reg_n != pr_res_holder) 3218 __core_scsi3_complete_pro_release(dev, 3219 pr_res_holder->pr_reg_nacl, 3220 dev->dev_pr_res_holder, 0); 3221 /* 3222 * b) Remove the registrations for all I_T nexuses identified 3223 * by the SERVICE ACTION RESERVATION KEY field, except the 3224 * I_T nexus that is being used for the PERSISTENT RESERVE 3225 * OUT command. If an all registrants persistent reservation 3226 * is present and the SERVICE ACTION RESERVATION KEY field 3227 * is set to zero, then all registrations shall be removed 3228 * except for that of the I_T nexus that is being used for 3229 * the PERSISTENT RESERVE OUT command; 3230 */ 3231 spin_lock(&pr_tmpl->registration_lock); 3232 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3233 &pr_tmpl->registration_list, pr_reg_list) { 3234 3235 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3236 if (calling_it_nexus) 3237 continue; 3238 3239 if (pr_reg->pr_res_key != sa_res_key) 3240 continue; 3241 3242 pr_reg_nacl = pr_reg->pr_reg_nacl; 3243 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3244 __core_scsi3_free_registration(dev, pr_reg, 3245 (abort) ? &preempt_and_abort_list : NULL, 3246 calling_it_nexus); 3247 /* 3248 * e) Establish a unit attention condition for the initiator 3249 * port associated with every I_T nexus that lost its 3250 * persistent reservation and/or registration, with the 3251 * additional sense code set to REGISTRATIONS PREEMPTED; 3252 */ 3253 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3254 ASCQ_2AH_RESERVATIONS_PREEMPTED); 3255 } 3256 spin_unlock(&pr_tmpl->registration_lock); 3257 /* 3258 * c) Establish a persistent reservation for the preempting 3259 * I_T nexus using the contents of the SCOPE and TYPE fields; 3260 */ 3261 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3262 (abort) ? &preempt_and_abort_list : NULL, 3263 type, scope, abort); 3264 /* 3265 * d) Process tasks as defined in 5.7.1; 3266 * e) See above.. 3267 * f) If the type or scope has changed, then for every I_T nexus 3268 * whose reservation key was not removed, except for the I_T 3269 * nexus on which the PERSISTENT RESERVE OUT command was 3270 * received, the device server shall establish a unit 3271 * attention condition for the initiator port associated with 3272 * that I_T nexus, with the additional sense code set to 3273 * RESERVATIONS RELEASED. If the type or scope have not 3274 * changed, then no unit attention condition(s) shall be 3275 * established for this reason. 3276 */ 3277 if ((prh_type != type) || (prh_scope != scope)) { 3278 spin_lock(&pr_tmpl->registration_lock); 3279 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3280 &pr_tmpl->registration_list, pr_reg_list) { 3281 3282 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3283 if (calling_it_nexus) 3284 continue; 3285 3286 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3287 pr_reg->pr_res_mapped_lun, 0x2A, 3288 ASCQ_2AH_RESERVATIONS_RELEASED); 3289 } 3290 spin_unlock(&pr_tmpl->registration_lock); 3291 } 3292 spin_unlock(&dev->dev_reservation_lock); 3293 /* 3294 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3295 * All received CDBs for the matching existing reservation and 3296 * registrations undergo ABORT_TASK logic. 3297 * 3298 * From there, core_scsi3_release_preempt_and_abort() will 3299 * release every registration in the list (which have already 3300 * been removed from the primary pr_reg list), except the 3301 * new persistent reservation holder, the calling Initiator Port. 3302 */ 3303 if (abort) { 3304 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3305 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3306 pr_reg_n); 3307 } 3308 3309 if (pr_tmpl->pr_aptpl_active) { 3310 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3311 &pr_reg_n->pr_aptpl_buf[0], 3312 pr_tmpl->pr_aptpl_buf_len); 3313 if (!ret) 3314 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3315 "%s\n", (abort) ? "_AND_ABORT" : ""); 3316 } 3317 3318 core_scsi3_put_pr_reg(pr_reg_n); 3319 core_scsi3_pr_generation(cmd->se_dev); 3320 return 0; 3321 } 3322 3323 static int core_scsi3_emulate_pro_preempt( 3324 struct se_cmd *cmd, 3325 int type, 3326 int scope, 3327 u64 res_key, 3328 u64 sa_res_key, 3329 int abort) 3330 { 3331 int ret = 0; 3332 3333 switch (type) { 3334 case PR_TYPE_WRITE_EXCLUSIVE: 3335 case PR_TYPE_EXCLUSIVE_ACCESS: 3336 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3338 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3339 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3340 ret = core_scsi3_pro_preempt(cmd, type, scope, 3341 res_key, sa_res_key, abort); 3342 break; 3343 default: 3344 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3345 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3346 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3347 return -EINVAL; 3348 } 3349 3350 return ret; 3351 } 3352 3353 3354 static int core_scsi3_emulate_pro_register_and_move( 3355 struct se_cmd *cmd, 3356 u64 res_key, 3357 u64 sa_res_key, 3358 int aptpl, 3359 int unreg) 3360 { 3361 struct se_session *se_sess = cmd->se_sess; 3362 struct se_device *dev = cmd->se_dev; 3363 struct se_dev_entry *se_deve, *dest_se_deve = NULL; 3364 struct se_lun *se_lun = cmd->se_lun; 3365 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3366 struct se_port *se_port; 3367 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3368 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3369 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3370 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3371 unsigned char *buf; 3372 unsigned char *initiator_str; 3373 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3374 u32 tid_len, tmp_tid_len; 3375 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3376 unsigned short rtpi; 3377 unsigned char proto_ident; 3378 3379 if (!se_sess || !se_lun) { 3380 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3381 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3382 return -EINVAL; 3383 } 3384 memset(dest_iport, 0, 64); 3385 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3386 se_tpg = se_sess->se_tpg; 3387 tf_ops = se_tpg->se_tpg_tfo; 3388 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3389 /* 3390 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3391 * Register behaviors for a REGISTER AND MOVE service action 3392 * 3393 * Locate the existing *pr_reg via struct se_node_acl pointers 3394 */ 3395 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3396 se_sess); 3397 if (!pr_reg) { 3398 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3399 " *pr_reg for REGISTER_AND_MOVE\n"); 3400 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3401 return -EINVAL; 3402 } 3403 /* 3404 * The provided reservation key much match the existing reservation key 3405 * provided during this initiator's I_T nexus registration. 3406 */ 3407 if (res_key != pr_reg->pr_res_key) { 3408 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3409 " res_key: 0x%016Lx does not match existing SA REGISTER" 3410 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3411 core_scsi3_put_pr_reg(pr_reg); 3412 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3413 return -EINVAL; 3414 } 3415 /* 3416 * The service active reservation key needs to be non zero 3417 */ 3418 if (!sa_res_key) { 3419 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3420 " sa_res_key\n"); 3421 core_scsi3_put_pr_reg(pr_reg); 3422 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3423 return -EINVAL; 3424 } 3425 3426 /* 3427 * Determine the Relative Target Port Identifier where the reservation 3428 * will be moved to for the TransportID containing SCSI initiator WWN 3429 * information. 3430 */ 3431 buf = transport_kmap_first_data_page(cmd); 3432 rtpi = (buf[18] & 0xff) << 8; 3433 rtpi |= buf[19] & 0xff; 3434 tid_len = (buf[20] & 0xff) << 24; 3435 tid_len |= (buf[21] & 0xff) << 16; 3436 tid_len |= (buf[22] & 0xff) << 8; 3437 tid_len |= buf[23] & 0xff; 3438 transport_kunmap_first_data_page(cmd); 3439 buf = NULL; 3440 3441 if ((tid_len + 24) != cmd->data_length) { 3442 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3443 " does not equal CDB data_length: %u\n", tid_len, 3444 cmd->data_length); 3445 core_scsi3_put_pr_reg(pr_reg); 3446 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3447 return -EINVAL; 3448 } 3449 3450 spin_lock(&dev->se_port_lock); 3451 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3452 if (se_port->sep_rtpi != rtpi) 3453 continue; 3454 dest_se_tpg = se_port->sep_tpg; 3455 if (!dest_se_tpg) 3456 continue; 3457 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3458 if (!dest_tf_ops) 3459 continue; 3460 3461 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3462 smp_mb__after_atomic_inc(); 3463 spin_unlock(&dev->se_port_lock); 3464 3465 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3466 if (ret != 0) { 3467 pr_err("core_scsi3_tpg_depend_item() failed" 3468 " for dest_se_tpg\n"); 3469 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3470 smp_mb__after_atomic_dec(); 3471 core_scsi3_put_pr_reg(pr_reg); 3472 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3473 return -EINVAL; 3474 } 3475 3476 spin_lock(&dev->se_port_lock); 3477 break; 3478 } 3479 spin_unlock(&dev->se_port_lock); 3480 3481 if (!dest_se_tpg || !dest_tf_ops) { 3482 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3483 " fabric ops from Relative Target Port Identifier:" 3484 " %hu\n", rtpi); 3485 core_scsi3_put_pr_reg(pr_reg); 3486 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3487 return -EINVAL; 3488 } 3489 3490 buf = transport_kmap_first_data_page(cmd); 3491 proto_ident = (buf[24] & 0x0f); 3492 #if 0 3493 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3494 " 0x%02x\n", proto_ident); 3495 #endif 3496 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3497 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3498 " proto_ident: 0x%02x does not match ident: 0x%02x" 3499 " from fabric: %s\n", proto_ident, 3500 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3501 dest_tf_ops->get_fabric_name()); 3502 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3503 ret = -EINVAL; 3504 goto out; 3505 } 3506 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3507 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3508 " containg a valid tpg_parse_pr_out_transport_id" 3509 " function pointer\n"); 3510 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3511 ret = -EINVAL; 3512 goto out; 3513 } 3514 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3515 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3516 if (!initiator_str) { 3517 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3518 " initiator_str from Transport ID\n"); 3519 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3520 ret = -EINVAL; 3521 goto out; 3522 } 3523 3524 transport_kunmap_first_data_page(cmd); 3525 buf = NULL; 3526 3527 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3528 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3529 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3530 iport_ptr : ""); 3531 /* 3532 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3533 * action specifies a TransportID that is the same as the initiator port 3534 * of the I_T nexus for the command received, then the command shall 3535 * be terminated with CHECK CONDITION status, with the sense key set to 3536 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3537 * IN PARAMETER LIST. 3538 */ 3539 pr_reg_nacl = pr_reg->pr_reg_nacl; 3540 matching_iname = (!strcmp(initiator_str, 3541 pr_reg_nacl->initiatorname)) ? 1 : 0; 3542 if (!matching_iname) 3543 goto after_iport_check; 3544 3545 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3546 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3547 " matches: %s on received I_T Nexus\n", initiator_str, 3548 pr_reg_nacl->initiatorname); 3549 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3550 ret = -EINVAL; 3551 goto out; 3552 } 3553 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3554 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3555 " matches: %s %s on received I_T Nexus\n", 3556 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3557 pr_reg->pr_reg_isid); 3558 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3559 ret = -EINVAL; 3560 goto out; 3561 } 3562 after_iport_check: 3563 /* 3564 * Locate the destination struct se_node_acl from the received Transport ID 3565 */ 3566 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3567 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3568 initiator_str); 3569 if (dest_node_acl) { 3570 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3571 smp_mb__after_atomic_inc(); 3572 } 3573 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3574 3575 if (!dest_node_acl) { 3576 pr_err("Unable to locate %s dest_node_acl for" 3577 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3578 initiator_str); 3579 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3580 ret = -EINVAL; 3581 goto out; 3582 } 3583 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3584 if (ret != 0) { 3585 pr_err("core_scsi3_nodeacl_depend_item() for" 3586 " dest_node_acl\n"); 3587 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3588 smp_mb__after_atomic_dec(); 3589 dest_node_acl = NULL; 3590 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3591 ret = -EINVAL; 3592 goto out; 3593 } 3594 #if 0 3595 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3596 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3597 dest_node_acl->initiatorname); 3598 #endif 3599 /* 3600 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3601 * PORT IDENTIFIER. 3602 */ 3603 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3604 if (!dest_se_deve) { 3605 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3606 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3607 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3608 ret = -EINVAL; 3609 goto out; 3610 } 3611 3612 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3613 if (ret < 0) { 3614 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3615 atomic_dec(&dest_se_deve->pr_ref_count); 3616 smp_mb__after_atomic_dec(); 3617 dest_se_deve = NULL; 3618 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3619 ret = -EINVAL; 3620 goto out; 3621 } 3622 #if 0 3623 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3624 " ACL for dest_se_deve->mapped_lun: %u\n", 3625 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3626 dest_se_deve->mapped_lun); 3627 #endif 3628 /* 3629 * A persistent reservation needs to already existing in order to 3630 * successfully complete the REGISTER_AND_MOVE service action.. 3631 */ 3632 spin_lock(&dev->dev_reservation_lock); 3633 pr_res_holder = dev->dev_pr_res_holder; 3634 if (!pr_res_holder) { 3635 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3636 " currently held\n"); 3637 spin_unlock(&dev->dev_reservation_lock); 3638 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3639 ret = -EINVAL; 3640 goto out; 3641 } 3642 /* 3643 * The received on I_T Nexus must be the reservation holder. 3644 * 3645 * From spc4r17 section 5.7.8 Table 50 -- 3646 * Register behaviors for a REGISTER AND MOVE service action 3647 */ 3648 if (pr_res_holder != pr_reg) { 3649 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3650 " Nexus is not reservation holder\n"); 3651 spin_unlock(&dev->dev_reservation_lock); 3652 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3653 ret = -EINVAL; 3654 goto out; 3655 } 3656 /* 3657 * From spc4r17 section 5.7.8: registering and moving reservation 3658 * 3659 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3660 * action is received and the established persistent reservation is a 3661 * Write Exclusive - All Registrants type or Exclusive Access - 3662 * All Registrants type reservation, then the command shall be completed 3663 * with RESERVATION CONFLICT status. 3664 */ 3665 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3666 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3667 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3668 " reservation for type: %s\n", 3669 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3670 spin_unlock(&dev->dev_reservation_lock); 3671 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3672 ret = -EINVAL; 3673 goto out; 3674 } 3675 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3676 /* 3677 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3678 */ 3679 type = pr_res_holder->pr_res_type; 3680 scope = pr_res_holder->pr_res_type; 3681 /* 3682 * c) Associate the reservation key specified in the SERVICE ACTION 3683 * RESERVATION KEY field with the I_T nexus specified as the 3684 * destination of the register and move, where: 3685 * A) The I_T nexus is specified by the TransportID and the 3686 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3687 * B) Regardless of the TransportID format used, the association for 3688 * the initiator port is based on either the initiator port name 3689 * (see 3.1.71) on SCSI transport protocols where port names are 3690 * required or the initiator port identifier (see 3.1.70) on SCSI 3691 * transport protocols where port names are not required; 3692 * d) Register the reservation key specified in the SERVICE ACTION 3693 * RESERVATION KEY field; 3694 * e) Retain the reservation key specified in the SERVICE ACTION 3695 * RESERVATION KEY field and associated information; 3696 * 3697 * Also, It is not an error for a REGISTER AND MOVE service action to 3698 * register an I_T nexus that is already registered with the same 3699 * reservation key or a different reservation key. 3700 */ 3701 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3702 iport_ptr); 3703 if (!dest_pr_reg) { 3704 ret = core_scsi3_alloc_registration(cmd->se_dev, 3705 dest_node_acl, dest_se_deve, iport_ptr, 3706 sa_res_key, 0, aptpl, 2, 1); 3707 if (ret != 0) { 3708 spin_unlock(&dev->dev_reservation_lock); 3709 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3710 ret = -EINVAL; 3711 goto out; 3712 } 3713 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3714 iport_ptr); 3715 new_reg = 1; 3716 } 3717 /* 3718 * f) Release the persistent reservation for the persistent reservation 3719 * holder (i.e., the I_T nexus on which the 3720 */ 3721 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3722 dev->dev_pr_res_holder, 0); 3723 /* 3724 * g) Move the persistent reservation to the specified I_T nexus using 3725 * the same scope and type as the persistent reservation released in 3726 * item f); and 3727 */ 3728 dev->dev_pr_res_holder = dest_pr_reg; 3729 dest_pr_reg->pr_res_holder = 1; 3730 dest_pr_reg->pr_res_type = type; 3731 pr_reg->pr_res_scope = scope; 3732 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3733 PR_REG_ISID_ID_LEN); 3734 /* 3735 * Increment PRGeneration for existing registrations.. 3736 */ 3737 if (!new_reg) 3738 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3739 spin_unlock(&dev->dev_reservation_lock); 3740 3741 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3742 " created new reservation holder TYPE: %s on object RTPI:" 3743 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3744 core_scsi3_pr_dump_type(type), rtpi, 3745 dest_pr_reg->pr_res_generation); 3746 pr_debug("SPC-3 PR Successfully moved reservation from" 3747 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3748 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3749 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3750 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3751 iport_ptr : ""); 3752 /* 3753 * It is now safe to release configfs group dependencies for destination 3754 * of Transport ID Initiator Device/Port Identifier 3755 */ 3756 core_scsi3_lunacl_undepend_item(dest_se_deve); 3757 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3758 core_scsi3_tpg_undepend_item(dest_se_tpg); 3759 /* 3760 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3761 * nexus on which PERSISTENT RESERVE OUT command was received. 3762 */ 3763 if (unreg) { 3764 spin_lock(&pr_tmpl->registration_lock); 3765 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3766 spin_unlock(&pr_tmpl->registration_lock); 3767 } else 3768 core_scsi3_put_pr_reg(pr_reg); 3769 3770 /* 3771 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3772 * write out the updated metadata to struct file for this SCSI device. 3773 */ 3774 if (!aptpl) { 3775 pr_tmpl->pr_aptpl_active = 0; 3776 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3777 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3778 " REGISTER_AND_MOVE\n"); 3779 } else { 3780 pr_tmpl->pr_aptpl_active = 1; 3781 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3782 &dest_pr_reg->pr_aptpl_buf[0], 3783 pr_tmpl->pr_aptpl_buf_len); 3784 if (!ret) 3785 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3786 " REGISTER_AND_MOVE\n"); 3787 } 3788 3789 transport_kunmap_first_data_page(cmd); 3790 3791 core_scsi3_put_pr_reg(dest_pr_reg); 3792 return 0; 3793 out: 3794 if (buf) 3795 transport_kunmap_first_data_page(cmd); 3796 if (dest_se_deve) 3797 core_scsi3_lunacl_undepend_item(dest_se_deve); 3798 if (dest_node_acl) 3799 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3800 core_scsi3_tpg_undepend_item(dest_se_tpg); 3801 core_scsi3_put_pr_reg(pr_reg); 3802 return ret; 3803 } 3804 3805 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3806 { 3807 unsigned int __v1, __v2; 3808 3809 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3810 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3811 3812 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3813 } 3814 3815 /* 3816 * See spc4r17 section 6.14 Table 170 3817 */ 3818 int target_scsi3_emulate_pr_out(struct se_task *task) 3819 { 3820 struct se_cmd *cmd = task->task_se_cmd; 3821 unsigned char *cdb = &cmd->t_task_cdb[0]; 3822 unsigned char *buf; 3823 u64 res_key, sa_res_key; 3824 int sa, scope, type, aptpl; 3825 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3826 int ret; 3827 3828 /* 3829 * Following spc2r20 5.5.1 Reservations overview: 3830 * 3831 * If a logical unit has been reserved by any RESERVE command and is 3832 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3833 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3834 * initiator or service action and shall terminate with a RESERVATION 3835 * CONFLICT status. 3836 */ 3837 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3838 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3839 " SPC-2 reservation is held, returning" 3840 " RESERVATION_CONFLICT\n"); 3841 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3842 ret = EINVAL; 3843 goto out; 3844 } 3845 3846 /* 3847 * FIXME: A NULL struct se_session pointer means an this is not coming from 3848 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3849 */ 3850 if (!cmd->se_sess) { 3851 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3852 return -EINVAL; 3853 } 3854 3855 if (cmd->data_length < 24) { 3856 pr_warn("SPC-PR: Received PR OUT parameter list" 3857 " length too small: %u\n", cmd->data_length); 3858 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3859 ret = -EINVAL; 3860 goto out; 3861 } 3862 /* 3863 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3864 */ 3865 sa = (cdb[1] & 0x1f); 3866 scope = (cdb[2] & 0xf0); 3867 type = (cdb[2] & 0x0f); 3868 3869 buf = transport_kmap_first_data_page(cmd); 3870 /* 3871 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3872 */ 3873 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3874 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3875 /* 3876 * REGISTER_AND_MOVE uses a different SA parameter list containing 3877 * SCSI TransportIDs. 3878 */ 3879 if (sa != PRO_REGISTER_AND_MOVE) { 3880 spec_i_pt = (buf[20] & 0x08); 3881 all_tg_pt = (buf[20] & 0x04); 3882 aptpl = (buf[20] & 0x01); 3883 } else { 3884 aptpl = (buf[17] & 0x01); 3885 unreg = (buf[17] & 0x02); 3886 } 3887 transport_kunmap_first_data_page(cmd); 3888 buf = NULL; 3889 3890 /* 3891 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3892 */ 3893 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3894 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3895 ret = -EINVAL; 3896 goto out; 3897 } 3898 3899 /* 3900 * From spc4r17 section 6.14: 3901 * 3902 * If the SPEC_I_PT bit is set to zero, the service action is not 3903 * REGISTER AND MOVE, and the parameter list length is not 24, then 3904 * the command shall be terminated with CHECK CONDITION status, with 3905 * the sense key set to ILLEGAL REQUEST, and the additional sense 3906 * code set to PARAMETER LIST LENGTH ERROR. 3907 */ 3908 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3909 (cmd->data_length != 24)) { 3910 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3911 " list length: %u\n", cmd->data_length); 3912 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3913 ret = -EINVAL; 3914 goto out; 3915 } 3916 /* 3917 * (core_scsi3_emulate_pro_* function parameters 3918 * are defined by spc4r17 Table 174: 3919 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3920 */ 3921 switch (sa) { 3922 case PRO_REGISTER: 3923 ret = core_scsi3_emulate_pro_register(cmd, 3924 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3925 break; 3926 case PRO_RESERVE: 3927 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3928 break; 3929 case PRO_RELEASE: 3930 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3931 break; 3932 case PRO_CLEAR: 3933 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3934 break; 3935 case PRO_PREEMPT: 3936 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3937 res_key, sa_res_key, 0); 3938 break; 3939 case PRO_PREEMPT_AND_ABORT: 3940 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3941 res_key, sa_res_key, 1); 3942 break; 3943 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3944 ret = core_scsi3_emulate_pro_register(cmd, 3945 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3946 break; 3947 case PRO_REGISTER_AND_MOVE: 3948 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3949 sa_res_key, aptpl, unreg); 3950 break; 3951 default: 3952 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3953 " action: 0x%02x\n", cdb[1] & 0x1f); 3954 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3955 ret = -EINVAL; 3956 break; 3957 } 3958 3959 out: 3960 if (!ret) { 3961 task->task_scsi_status = GOOD; 3962 transport_complete_task(task, 1); 3963 } 3964 return ret; 3965 } 3966 3967 /* 3968 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3969 * 3970 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3971 */ 3972 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3973 { 3974 struct se_device *se_dev = cmd->se_dev; 3975 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3976 struct t10_pr_registration *pr_reg; 3977 unsigned char *buf; 3978 u32 add_len = 0, off = 8; 3979 3980 if (cmd->data_length < 8) { 3981 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3982 " too small\n", cmd->data_length); 3983 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3984 return -EINVAL; 3985 } 3986 3987 buf = transport_kmap_first_data_page(cmd); 3988 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3989 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3990 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3991 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3992 3993 spin_lock(&su_dev->t10_pr.registration_lock); 3994 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3995 pr_reg_list) { 3996 /* 3997 * Check for overflow of 8byte PRI READ_KEYS payload and 3998 * next reservation key list descriptor. 3999 */ 4000 if ((add_len + 8) > (cmd->data_length - 8)) 4001 break; 4002 4003 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4004 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4005 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4006 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4007 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4008 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4009 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4010 buf[off++] = (pr_reg->pr_res_key & 0xff); 4011 4012 add_len += 8; 4013 } 4014 spin_unlock(&su_dev->t10_pr.registration_lock); 4015 4016 buf[4] = ((add_len >> 24) & 0xff); 4017 buf[5] = ((add_len >> 16) & 0xff); 4018 buf[6] = ((add_len >> 8) & 0xff); 4019 buf[7] = (add_len & 0xff); 4020 4021 transport_kunmap_first_data_page(cmd); 4022 4023 return 0; 4024 } 4025 4026 /* 4027 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4028 * 4029 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4030 */ 4031 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4032 { 4033 struct se_device *se_dev = cmd->se_dev; 4034 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4035 struct t10_pr_registration *pr_reg; 4036 unsigned char *buf; 4037 u64 pr_res_key; 4038 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4039 4040 if (cmd->data_length < 8) { 4041 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4042 " too small\n", cmd->data_length); 4043 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4044 return -EINVAL; 4045 } 4046 4047 buf = transport_kmap_first_data_page(cmd); 4048 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4049 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4050 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4051 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4052 4053 spin_lock(&se_dev->dev_reservation_lock); 4054 pr_reg = se_dev->dev_pr_res_holder; 4055 if ((pr_reg)) { 4056 /* 4057 * Set the hardcoded Additional Length 4058 */ 4059 buf[4] = ((add_len >> 24) & 0xff); 4060 buf[5] = ((add_len >> 16) & 0xff); 4061 buf[6] = ((add_len >> 8) & 0xff); 4062 buf[7] = (add_len & 0xff); 4063 4064 if (cmd->data_length < 22) 4065 goto err; 4066 4067 /* 4068 * Set the Reservation key. 4069 * 4070 * From spc4r17, section 5.7.10: 4071 * A persistent reservation holder has its reservation key 4072 * returned in the parameter data from a PERSISTENT 4073 * RESERVE IN command with READ RESERVATION service action as 4074 * follows: 4075 * a) For a persistent reservation of the type Write Exclusive 4076 * - All Registrants or Exclusive Access All Regitrants, 4077 * the reservation key shall be set to zero; or 4078 * b) For all other persistent reservation types, the 4079 * reservation key shall be set to the registered 4080 * reservation key for the I_T nexus that holds the 4081 * persistent reservation. 4082 */ 4083 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4084 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4085 pr_res_key = 0; 4086 else 4087 pr_res_key = pr_reg->pr_res_key; 4088 4089 buf[8] = ((pr_res_key >> 56) & 0xff); 4090 buf[9] = ((pr_res_key >> 48) & 0xff); 4091 buf[10] = ((pr_res_key >> 40) & 0xff); 4092 buf[11] = ((pr_res_key >> 32) & 0xff); 4093 buf[12] = ((pr_res_key >> 24) & 0xff); 4094 buf[13] = ((pr_res_key >> 16) & 0xff); 4095 buf[14] = ((pr_res_key >> 8) & 0xff); 4096 buf[15] = (pr_res_key & 0xff); 4097 /* 4098 * Set the SCOPE and TYPE 4099 */ 4100 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4101 (pr_reg->pr_res_type & 0x0f); 4102 } 4103 4104 err: 4105 spin_unlock(&se_dev->dev_reservation_lock); 4106 transport_kunmap_first_data_page(cmd); 4107 4108 return 0; 4109 } 4110 4111 /* 4112 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4113 * 4114 * See spc4r17 section 6.13.4 Table 165 4115 */ 4116 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4117 { 4118 struct se_device *dev = cmd->se_dev; 4119 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4120 unsigned char *buf; 4121 u16 add_len = 8; /* Hardcoded to 8. */ 4122 4123 if (cmd->data_length < 6) { 4124 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4125 " %u too small\n", cmd->data_length); 4126 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4127 return -EINVAL; 4128 } 4129 4130 buf = transport_kmap_first_data_page(cmd); 4131 4132 buf[0] = ((add_len << 8) & 0xff); 4133 buf[1] = (add_len & 0xff); 4134 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4135 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4136 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4137 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4138 /* 4139 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4140 * set the TMV: Task Mask Valid bit. 4141 */ 4142 buf[3] |= 0x80; 4143 /* 4144 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4145 */ 4146 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4147 /* 4148 * PTPL_A: Persistence across Target Power Loss Active bit 4149 */ 4150 if (pr_tmpl->pr_aptpl_active) 4151 buf[3] |= 0x01; 4152 /* 4153 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4154 */ 4155 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4156 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4157 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4158 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4159 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4160 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4161 4162 transport_kunmap_first_data_page(cmd); 4163 4164 return 0; 4165 } 4166 4167 /* 4168 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4169 * 4170 * See spc4r17 section 6.13.5 Table 168 and 169 4171 */ 4172 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4173 { 4174 struct se_device *se_dev = cmd->se_dev; 4175 struct se_node_acl *se_nacl; 4176 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4177 struct se_portal_group *se_tpg; 4178 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4179 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4180 unsigned char *buf; 4181 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4182 u32 off = 8; /* off into first Full Status descriptor */ 4183 int format_code = 0; 4184 4185 if (cmd->data_length < 8) { 4186 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4187 " too small\n", cmd->data_length); 4188 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4189 return -EINVAL; 4190 } 4191 4192 buf = transport_kmap_first_data_page(cmd); 4193 4194 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4195 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4196 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4197 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4198 4199 spin_lock(&pr_tmpl->registration_lock); 4200 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4201 &pr_tmpl->registration_list, pr_reg_list) { 4202 4203 se_nacl = pr_reg->pr_reg_nacl; 4204 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4205 add_desc_len = 0; 4206 4207 atomic_inc(&pr_reg->pr_res_holders); 4208 smp_mb__after_atomic_inc(); 4209 spin_unlock(&pr_tmpl->registration_lock); 4210 /* 4211 * Determine expected length of $FABRIC_MOD specific 4212 * TransportID full status descriptor.. 4213 */ 4214 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4215 se_tpg, se_nacl, pr_reg, &format_code); 4216 4217 if ((exp_desc_len + add_len) > cmd->data_length) { 4218 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4219 " out of buffer: %d\n", cmd->data_length); 4220 spin_lock(&pr_tmpl->registration_lock); 4221 atomic_dec(&pr_reg->pr_res_holders); 4222 smp_mb__after_atomic_dec(); 4223 break; 4224 } 4225 /* 4226 * Set RESERVATION KEY 4227 */ 4228 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4229 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4230 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4231 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4232 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4233 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4234 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4235 buf[off++] = (pr_reg->pr_res_key & 0xff); 4236 off += 4; /* Skip Over Reserved area */ 4237 4238 /* 4239 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4240 */ 4241 if (pr_reg->pr_reg_all_tg_pt) 4242 buf[off] = 0x02; 4243 /* 4244 * The struct se_lun pointer will be present for the 4245 * reservation holder for PR_HOLDER bit. 4246 * 4247 * Also, if this registration is the reservation 4248 * holder, fill in SCOPE and TYPE in the next byte. 4249 */ 4250 if (pr_reg->pr_res_holder) { 4251 buf[off++] |= 0x01; 4252 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4253 (pr_reg->pr_res_type & 0x0f); 4254 } else 4255 off += 2; 4256 4257 off += 4; /* Skip over reserved area */ 4258 /* 4259 * From spc4r17 6.3.15: 4260 * 4261 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4262 * IDENTIFIER field contains the relative port identifier (see 4263 * 3.1.120) of the target port that is part of the I_T nexus 4264 * described by this full status descriptor. If the ALL_TG_PT 4265 * bit is set to one, the contents of the RELATIVE TARGET PORT 4266 * IDENTIFIER field are not defined by this standard. 4267 */ 4268 if (!pr_reg->pr_reg_all_tg_pt) { 4269 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4270 4271 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4272 buf[off++] = (port->sep_rtpi & 0xff); 4273 } else 4274 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4275 4276 /* 4277 * Now, have the $FABRIC_MOD fill in the protocol identifier 4278 */ 4279 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4280 se_nacl, pr_reg, &format_code, &buf[off+4]); 4281 4282 spin_lock(&pr_tmpl->registration_lock); 4283 atomic_dec(&pr_reg->pr_res_holders); 4284 smp_mb__after_atomic_dec(); 4285 /* 4286 * Set the ADDITIONAL DESCRIPTOR LENGTH 4287 */ 4288 buf[off++] = ((desc_len >> 24) & 0xff); 4289 buf[off++] = ((desc_len >> 16) & 0xff); 4290 buf[off++] = ((desc_len >> 8) & 0xff); 4291 buf[off++] = (desc_len & 0xff); 4292 /* 4293 * Size of full desctipor header minus TransportID 4294 * containing $FABRIC_MOD specific) initiator device/port 4295 * WWN information. 4296 * 4297 * See spc4r17 Section 6.13.5 Table 169 4298 */ 4299 add_desc_len = (24 + desc_len); 4300 4301 off += desc_len; 4302 add_len += add_desc_len; 4303 } 4304 spin_unlock(&pr_tmpl->registration_lock); 4305 /* 4306 * Set ADDITIONAL_LENGTH 4307 */ 4308 buf[4] = ((add_len >> 24) & 0xff); 4309 buf[5] = ((add_len >> 16) & 0xff); 4310 buf[6] = ((add_len >> 8) & 0xff); 4311 buf[7] = (add_len & 0xff); 4312 4313 transport_kunmap_first_data_page(cmd); 4314 4315 return 0; 4316 } 4317 4318 int target_scsi3_emulate_pr_in(struct se_task *task) 4319 { 4320 struct se_cmd *cmd = task->task_se_cmd; 4321 int ret; 4322 4323 /* 4324 * Following spc2r20 5.5.1 Reservations overview: 4325 * 4326 * If a logical unit has been reserved by any RESERVE command and is 4327 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4328 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4329 * initiator or service action and shall terminate with a RESERVATION 4330 * CONFLICT status. 4331 */ 4332 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4333 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4334 " SPC-2 reservation is held, returning" 4335 " RESERVATION_CONFLICT\n"); 4336 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4337 return -EINVAL; 4338 } 4339 4340 switch (cmd->t_task_cdb[1] & 0x1f) { 4341 case PRI_READ_KEYS: 4342 ret = core_scsi3_pri_read_keys(cmd); 4343 break; 4344 case PRI_READ_RESERVATION: 4345 ret = core_scsi3_pri_read_reservation(cmd); 4346 break; 4347 case PRI_REPORT_CAPABILITIES: 4348 ret = core_scsi3_pri_report_capabilities(cmd); 4349 break; 4350 case PRI_READ_FULL_STATUS: 4351 ret = core_scsi3_pri_read_full_status(cmd); 4352 break; 4353 default: 4354 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4355 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4356 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4357 ret = -EINVAL; 4358 break; 4359 } 4360 4361 if (!ret) { 4362 task->task_scsi_status = GOOD; 4363 transport_complete_task(task, 1); 4364 } 4365 return ret; 4366 } 4367 4368 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4369 { 4370 return 0; 4371 } 4372 4373 static int core_pt_seq_non_holder( 4374 struct se_cmd *cmd, 4375 unsigned char *cdb, 4376 u32 pr_reg_type) 4377 { 4378 return 0; 4379 } 4380 4381 int core_setup_reservations(struct se_device *dev, int force_pt) 4382 { 4383 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4384 struct t10_reservation *rest = &su_dev->t10_pr; 4385 /* 4386 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4387 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4388 * cause a problem because libata and some SATA RAID HBAs appear 4389 * under Linux/SCSI, but to emulate reservations themselves. 4390 */ 4391 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4392 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4393 rest->res_type = SPC_PASSTHROUGH; 4394 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4395 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4396 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4397 " emulation\n", dev->transport->name); 4398 return 0; 4399 } 4400 /* 4401 * If SPC-3 or above is reported by real or emulated struct se_device, 4402 * use emulated Persistent Reservations. 4403 */ 4404 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4405 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4406 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4407 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4408 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4409 " emulation\n", dev->transport->name); 4410 } else { 4411 rest->res_type = SPC2_RESERVATIONS; 4412 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4413 rest->pr_ops.t10_seq_non_holder = 4414 &core_scsi2_reservation_seq_non_holder; 4415 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4416 dev->transport->name); 4417 } 4418 4419 return 0; 4420 } 4421