1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * Copyright (c) 2009, 2010 Rising Tide Systems 8 * Copyright (c) 2009, 2010 Linux-iSCSI.org 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 25 * 26 ******************************************************************************/ 27 28 #include <linux/slab.h> 29 #include <linux/spinlock.h> 30 #include <linux/list.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 #include <target/target_core_configfs.h> 39 40 #include "target_core_internal.h" 41 #include "target_core_pr.h" 42 #include "target_core_ua.h" 43 44 /* 45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 46 */ 47 struct pr_transport_id_holder { 48 int dest_local_nexus; 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 int core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) 62 return 0; 63 64 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); 65 return 1; 66 } 67 68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 69 struct t10_pr_registration *, int); 70 71 static int core_scsi2_reservation_seq_non_holder( 72 struct se_cmd *cmd, 73 unsigned char *cdb, 74 u32 pr_reg_type) 75 { 76 switch (cdb[0]) { 77 case INQUIRY: 78 case RELEASE: 79 case RELEASE_10: 80 return 0; 81 default: 82 return 1; 83 } 84 85 return 1; 86 } 87 88 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type) 89 { 90 struct se_device *dev = cmd->se_dev; 91 struct se_session *sess = cmd->se_sess; 92 int ret; 93 94 if (!sess) 95 return 0; 96 97 spin_lock(&dev->dev_reservation_lock); 98 if (!dev->dev_reserved_node_acl || !sess) { 99 spin_unlock(&dev->dev_reservation_lock); 100 return 0; 101 } 102 if (dev->dev_reserved_node_acl != sess->se_node_acl) { 103 spin_unlock(&dev->dev_reservation_lock); 104 return -EINVAL; 105 } 106 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) { 107 spin_unlock(&dev->dev_reservation_lock); 108 return 0; 109 } 110 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL; 111 spin_unlock(&dev->dev_reservation_lock); 112 113 return ret; 114 } 115 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 117 struct se_node_acl *, struct se_session *); 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 119 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 121 { 122 struct se_session *se_sess = cmd->se_sess; 123 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 124 struct t10_pr_registration *pr_reg; 125 struct t10_reservation *pr_tmpl = &su_dev->t10_pr; 126 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS); 127 int conflict = 0; 128 129 if (!crh) 130 return -EINVAL; 131 132 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 133 se_sess); 134 if (pr_reg) { 135 /* 136 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 137 * behavior 138 * 139 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 140 * status, but no reservation shall be established and the 141 * persistent reservation shall not be changed, if the command 142 * is received from a) and b) below. 143 * 144 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 145 * status, but the persistent reservation shall not be released, 146 * if the command is received from a) and b) 147 * 148 * a) An I_T nexus that is a persistent reservation holder; or 149 * b) An I_T nexus that is registered if a registrants only or 150 * all registrants type persistent reservation is present. 151 * 152 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 153 * RELEASE(6) command, or RELEASE(10) command shall be processed 154 * as defined in SPC-2. 155 */ 156 if (pr_reg->pr_res_holder) { 157 core_scsi3_put_pr_reg(pr_reg); 158 return 1; 159 } 160 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 161 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 162 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 163 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 164 core_scsi3_put_pr_reg(pr_reg); 165 return 1; 166 } 167 core_scsi3_put_pr_reg(pr_reg); 168 conflict = 1; 169 } else { 170 /* 171 * Following spc2r20 5.5.1 Reservations overview: 172 * 173 * If a logical unit has executed a PERSISTENT RESERVE OUT 174 * command with the REGISTER or the REGISTER AND IGNORE 175 * EXISTING KEY service action and is still registered by any 176 * initiator, all RESERVE commands and all RELEASE commands 177 * regardless of initiator shall conflict and shall terminate 178 * with a RESERVATION CONFLICT status. 179 */ 180 spin_lock(&pr_tmpl->registration_lock); 181 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 182 spin_unlock(&pr_tmpl->registration_lock); 183 } 184 185 if (conflict) { 186 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 187 " while active SPC-3 registrations exist," 188 " returning RESERVATION_CONFLICT\n"); 189 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 190 return -EBUSY; 191 } 192 193 return 0; 194 } 195 196 int target_scsi2_reservation_release(struct se_task *task) 197 { 198 struct se_cmd *cmd = task->task_se_cmd; 199 struct se_device *dev = cmd->se_dev; 200 struct se_session *sess = cmd->se_sess; 201 struct se_portal_group *tpg = sess->se_tpg; 202 int ret = 0, rc; 203 204 if (!sess || !tpg) 205 goto out; 206 rc = target_check_scsi2_reservation_conflict(cmd); 207 if (rc == 1) 208 goto out; 209 else if (rc < 0) { 210 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 211 ret = -EINVAL; 212 goto out; 213 } 214 215 ret = 0; 216 spin_lock(&dev->dev_reservation_lock); 217 if (!dev->dev_reserved_node_acl || !sess) 218 goto out_unlock; 219 220 if (dev->dev_reserved_node_acl != sess->se_node_acl) 221 goto out_unlock; 222 223 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 224 goto out_unlock; 225 226 dev->dev_reserved_node_acl = NULL; 227 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 228 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 229 dev->dev_res_bin_isid = 0; 230 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 231 } 232 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 233 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 234 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 235 sess->se_node_acl->initiatorname); 236 237 out_unlock: 238 spin_unlock(&dev->dev_reservation_lock); 239 out: 240 if (!ret) { 241 task->task_scsi_status = GOOD; 242 transport_complete_task(task, 1); 243 } 244 return ret; 245 } 246 247 int target_scsi2_reservation_reserve(struct se_task *task) 248 { 249 struct se_cmd *cmd = task->task_se_cmd; 250 struct se_device *dev = cmd->se_dev; 251 struct se_session *sess = cmd->se_sess; 252 struct se_portal_group *tpg = sess->se_tpg; 253 int ret = 0, rc; 254 255 if ((cmd->t_task_cdb[1] & 0x01) && 256 (cmd->t_task_cdb[1] & 0x02)) { 257 pr_err("LongIO and Obselete Bits set, returning" 258 " ILLEGAL_REQUEST\n"); 259 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 260 ret = -EINVAL; 261 goto out; 262 } 263 /* 264 * This is currently the case for target_core_mod passthrough struct se_cmd 265 * ops 266 */ 267 if (!sess || !tpg) 268 goto out; 269 rc = target_check_scsi2_reservation_conflict(cmd); 270 if (rc == 1) 271 goto out; 272 else if (rc < 0) { 273 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 274 ret = -EINVAL; 275 goto out; 276 } 277 278 ret = 0; 279 spin_lock(&dev->dev_reservation_lock); 280 if (dev->dev_reserved_node_acl && 281 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 282 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 283 tpg->se_tpg_tfo->get_fabric_name()); 284 pr_err("Original reserver LUN: %u %s\n", 285 cmd->se_lun->unpacked_lun, 286 dev->dev_reserved_node_acl->initiatorname); 287 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 288 " from %s \n", cmd->se_lun->unpacked_lun, 289 cmd->se_deve->mapped_lun, 290 sess->se_node_acl->initiatorname); 291 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 292 ret = -EINVAL; 293 goto out_unlock; 294 } 295 296 dev->dev_reserved_node_acl = sess->se_node_acl; 297 dev->dev_flags |= DF_SPC2_RESERVATIONS; 298 if (sess->sess_bin_isid != 0) { 299 dev->dev_res_bin_isid = sess->sess_bin_isid; 300 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 301 } 302 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 303 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 304 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 305 sess->se_node_acl->initiatorname); 306 307 out_unlock: 308 spin_unlock(&dev->dev_reservation_lock); 309 out: 310 if (!ret) { 311 task->task_scsi_status = GOOD; 312 transport_complete_task(task, 1); 313 } 314 return ret; 315 } 316 317 318 /* 319 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 320 * 321 * This function is called by those initiator ports who are *NOT* 322 * the active PR reservation holder when a reservation is present. 323 */ 324 static int core_scsi3_pr_seq_non_holder( 325 struct se_cmd *cmd, 326 unsigned char *cdb, 327 u32 pr_reg_type) 328 { 329 struct se_dev_entry *se_deve; 330 struct se_session *se_sess = cmd->se_sess; 331 int other_cdb = 0, ignore_reg; 332 int registered_nexus = 0, ret = 1; /* Conflict by default */ 333 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 334 int we = 0; /* Write Exclusive */ 335 int legacy = 0; /* Act like a legacy device and return 336 * RESERVATION CONFLICT on some CDBs */ 337 /* 338 * A legacy SPC-2 reservation is being held. 339 */ 340 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 341 return core_scsi2_reservation_seq_non_holder(cmd, 342 cdb, pr_reg_type); 343 344 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 345 /* 346 * Determine if the registration should be ignored due to 347 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 348 */ 349 ignore_reg = (pr_reg_type & 0x80000000); 350 if (ignore_reg) 351 pr_reg_type &= ~0x80000000; 352 353 switch (pr_reg_type) { 354 case PR_TYPE_WRITE_EXCLUSIVE: 355 we = 1; 356 case PR_TYPE_EXCLUSIVE_ACCESS: 357 /* 358 * Some commands are only allowed for the persistent reservation 359 * holder. 360 */ 361 if ((se_deve->def_pr_registered) && !(ignore_reg)) 362 registered_nexus = 1; 363 break; 364 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 365 we = 1; 366 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 367 /* 368 * Some commands are only allowed for registered I_T Nexuses. 369 */ 370 reg_only = 1; 371 if ((se_deve->def_pr_registered) && !(ignore_reg)) 372 registered_nexus = 1; 373 break; 374 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 375 we = 1; 376 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 377 /* 378 * Each registered I_T Nexus is a reservation holder. 379 */ 380 all_reg = 1; 381 if ((se_deve->def_pr_registered) && !(ignore_reg)) 382 registered_nexus = 1; 383 break; 384 default: 385 return -EINVAL; 386 } 387 /* 388 * Referenced from spc4r17 table 45 for *NON* PR holder access 389 */ 390 switch (cdb[0]) { 391 case SECURITY_PROTOCOL_IN: 392 if (registered_nexus) 393 return 0; 394 ret = (we) ? 0 : 1; 395 break; 396 case MODE_SENSE: 397 case MODE_SENSE_10: 398 case READ_ATTRIBUTE: 399 case READ_BUFFER: 400 case RECEIVE_DIAGNOSTIC: 401 if (legacy) { 402 ret = 1; 403 break; 404 } 405 if (registered_nexus) { 406 ret = 0; 407 break; 408 } 409 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 410 break; 411 case PERSISTENT_RESERVE_OUT: 412 /* 413 * This follows PERSISTENT_RESERVE_OUT service actions that 414 * are allowed in the presence of various reservations. 415 * See spc4r17, table 46 416 */ 417 switch (cdb[1] & 0x1f) { 418 case PRO_CLEAR: 419 case PRO_PREEMPT: 420 case PRO_PREEMPT_AND_ABORT: 421 ret = (registered_nexus) ? 0 : 1; 422 break; 423 case PRO_REGISTER: 424 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 425 ret = 0; 426 break; 427 case PRO_REGISTER_AND_MOVE: 428 case PRO_RESERVE: 429 ret = 1; 430 break; 431 case PRO_RELEASE: 432 ret = (registered_nexus) ? 0 : 1; 433 break; 434 default: 435 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 436 " action: 0x%02x\n", cdb[1] & 0x1f); 437 return -EINVAL; 438 } 439 break; 440 case RELEASE: 441 case RELEASE_10: 442 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 443 ret = 0; 444 break; 445 case RESERVE: 446 case RESERVE_10: 447 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 448 ret = 0; 449 break; 450 case TEST_UNIT_READY: 451 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 452 break; 453 case MAINTENANCE_IN: 454 switch (cdb[1] & 0x1f) { 455 case MI_MANAGEMENT_PROTOCOL_IN: 456 if (registered_nexus) { 457 ret = 0; 458 break; 459 } 460 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 461 break; 462 case MI_REPORT_SUPPORTED_OPERATION_CODES: 463 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 464 if (legacy) { 465 ret = 1; 466 break; 467 } 468 if (registered_nexus) { 469 ret = 0; 470 break; 471 } 472 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 473 break; 474 case MI_REPORT_ALIASES: 475 case MI_REPORT_IDENTIFYING_INFORMATION: 476 case MI_REPORT_PRIORITY: 477 case MI_REPORT_TARGET_PGS: 478 case MI_REPORT_TIMESTAMP: 479 ret = 0; /* Allowed */ 480 break; 481 default: 482 pr_err("Unknown MI Service Action: 0x%02x\n", 483 (cdb[1] & 0x1f)); 484 return -EINVAL; 485 } 486 break; 487 case ACCESS_CONTROL_IN: 488 case ACCESS_CONTROL_OUT: 489 case INQUIRY: 490 case LOG_SENSE: 491 case READ_MEDIA_SERIAL_NUMBER: 492 case REPORT_LUNS: 493 case REQUEST_SENSE: 494 case PERSISTENT_RESERVE_IN: 495 ret = 0; /*/ Allowed CDBs */ 496 break; 497 default: 498 other_cdb = 1; 499 break; 500 } 501 /* 502 * Case where the CDB is explicitly allowed in the above switch 503 * statement. 504 */ 505 if (!ret && !other_cdb) { 506 #if 0 507 pr_debug("Allowing explict CDB: 0x%02x for %s" 508 " reservation holder\n", cdb[0], 509 core_scsi3_pr_dump_type(pr_reg_type)); 510 #endif 511 return ret; 512 } 513 /* 514 * Check if write exclusive initiator ports *NOT* holding the 515 * WRITE_EXCLUSIVE_* reservation. 516 */ 517 if ((we) && !(registered_nexus)) { 518 if (cmd->data_direction == DMA_TO_DEVICE) { 519 /* 520 * Conflict for write exclusive 521 */ 522 pr_debug("%s Conflict for unregistered nexus" 523 " %s CDB: 0x%02x to %s reservation\n", 524 transport_dump_cmd_direction(cmd), 525 se_sess->se_node_acl->initiatorname, cdb[0], 526 core_scsi3_pr_dump_type(pr_reg_type)); 527 return 1; 528 } else { 529 /* 530 * Allow non WRITE CDBs for all Write Exclusive 531 * PR TYPEs to pass for registered and 532 * non-registered_nexuxes NOT holding the reservation. 533 * 534 * We only make noise for the unregisterd nexuses, 535 * as we expect registered non-reservation holding 536 * nexuses to issue CDBs. 537 */ 538 #if 0 539 if (!registered_nexus) { 540 pr_debug("Allowing implict CDB: 0x%02x" 541 " for %s reservation on unregistered" 542 " nexus\n", cdb[0], 543 core_scsi3_pr_dump_type(pr_reg_type)); 544 } 545 #endif 546 return 0; 547 } 548 } else if ((reg_only) || (all_reg)) { 549 if (registered_nexus) { 550 /* 551 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 552 * allow commands from registered nexuses. 553 */ 554 #if 0 555 pr_debug("Allowing implict CDB: 0x%02x for %s" 556 " reservation\n", cdb[0], 557 core_scsi3_pr_dump_type(pr_reg_type)); 558 #endif 559 return 0; 560 } 561 } 562 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 563 " for %s reservation\n", transport_dump_cmd_direction(cmd), 564 (registered_nexus) ? "" : "un", 565 se_sess->se_node_acl->initiatorname, cdb[0], 566 core_scsi3_pr_dump_type(pr_reg_type)); 567 568 return 1; /* Conflict by default */ 569 } 570 571 static u32 core_scsi3_pr_generation(struct se_device *dev) 572 { 573 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 574 u32 prg; 575 /* 576 * PRGeneration field shall contain the value of a 32-bit wrapping 577 * counter mainted by the device server. 578 * 579 * Note that this is done regardless of Active Persist across 580 * Target PowerLoss (APTPL) 581 * 582 * See spc4r17 section 6.3.12 READ_KEYS service action 583 */ 584 spin_lock(&dev->dev_reservation_lock); 585 prg = su_dev->t10_pr.pr_generation++; 586 spin_unlock(&dev->dev_reservation_lock); 587 588 return prg; 589 } 590 591 static int core_scsi3_pr_reservation_check( 592 struct se_cmd *cmd, 593 u32 *pr_reg_type) 594 { 595 struct se_device *dev = cmd->se_dev; 596 struct se_session *sess = cmd->se_sess; 597 int ret; 598 599 if (!sess) 600 return 0; 601 /* 602 * A legacy SPC-2 reservation is being held. 603 */ 604 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 605 return core_scsi2_reservation_check(cmd, pr_reg_type); 606 607 spin_lock(&dev->dev_reservation_lock); 608 if (!dev->dev_pr_res_holder) { 609 spin_unlock(&dev->dev_reservation_lock); 610 return 0; 611 } 612 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 613 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 614 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 615 spin_unlock(&dev->dev_reservation_lock); 616 return -EINVAL; 617 } 618 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 619 spin_unlock(&dev->dev_reservation_lock); 620 return 0; 621 } 622 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 623 sess->sess_bin_isid) ? 0 : -EINVAL; 624 /* 625 * Use bit in *pr_reg_type to notify ISID mismatch in 626 * core_scsi3_pr_seq_non_holder(). 627 */ 628 if (ret != 0) 629 *pr_reg_type |= 0x80000000; 630 spin_unlock(&dev->dev_reservation_lock); 631 632 return ret; 633 } 634 635 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 636 struct se_device *dev, 637 struct se_node_acl *nacl, 638 struct se_dev_entry *deve, 639 unsigned char *isid, 640 u64 sa_res_key, 641 int all_tg_pt, 642 int aptpl) 643 { 644 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 645 struct t10_pr_registration *pr_reg; 646 647 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 648 if (!pr_reg) { 649 pr_err("Unable to allocate struct t10_pr_registration\n"); 650 return NULL; 651 } 652 653 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 654 GFP_ATOMIC); 655 if (!pr_reg->pr_aptpl_buf) { 656 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 657 kmem_cache_free(t10_pr_reg_cache, pr_reg); 658 return NULL; 659 } 660 661 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 662 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 663 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 664 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 665 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 666 atomic_set(&pr_reg->pr_res_holders, 0); 667 pr_reg->pr_reg_nacl = nacl; 668 pr_reg->pr_reg_deve = deve; 669 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 670 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 671 pr_reg->pr_res_key = sa_res_key; 672 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 673 pr_reg->pr_reg_aptpl = aptpl; 674 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 675 /* 676 * If an ISID value for this SCSI Initiator Port exists, 677 * save it to the registration now. 678 */ 679 if (isid != NULL) { 680 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 681 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 682 pr_reg->isid_present_at_reg = 1; 683 } 684 685 return pr_reg; 686 } 687 688 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 689 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 690 691 /* 692 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 693 * modes. 694 */ 695 static struct t10_pr_registration *__core_scsi3_alloc_registration( 696 struct se_device *dev, 697 struct se_node_acl *nacl, 698 struct se_dev_entry *deve, 699 unsigned char *isid, 700 u64 sa_res_key, 701 int all_tg_pt, 702 int aptpl) 703 { 704 struct se_dev_entry *deve_tmp; 705 struct se_node_acl *nacl_tmp; 706 struct se_port *port, *port_tmp; 707 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 708 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 709 int ret; 710 /* 711 * Create a registration for the I_T Nexus upon which the 712 * PROUT REGISTER was received. 713 */ 714 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 715 sa_res_key, all_tg_pt, aptpl); 716 if (!pr_reg) 717 return NULL; 718 /* 719 * Return pointer to pr_reg for ALL_TG_PT=0 720 */ 721 if (!all_tg_pt) 722 return pr_reg; 723 /* 724 * Create list of matching SCSI Initiator Port registrations 725 * for ALL_TG_PT=1 726 */ 727 spin_lock(&dev->se_port_lock); 728 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 729 atomic_inc(&port->sep_tg_pt_ref_cnt); 730 smp_mb__after_atomic_inc(); 731 spin_unlock(&dev->se_port_lock); 732 733 spin_lock_bh(&port->sep_alua_lock); 734 list_for_each_entry(deve_tmp, &port->sep_alua_list, 735 alua_port_list) { 736 /* 737 * This pointer will be NULL for demo mode MappedLUNs 738 * that have not been make explict via a ConfigFS 739 * MappedLUN group for the SCSI Initiator Node ACL. 740 */ 741 if (!deve_tmp->se_lun_acl) 742 continue; 743 744 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 745 /* 746 * Skip the matching struct se_node_acl that is allocated 747 * above.. 748 */ 749 if (nacl == nacl_tmp) 750 continue; 751 /* 752 * Only perform PR registrations for target ports on 753 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 754 * arrived. 755 */ 756 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 757 continue; 758 /* 759 * Look for a matching Initiator Node ACL in ASCII format 760 */ 761 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 762 continue; 763 764 atomic_inc(&deve_tmp->pr_ref_count); 765 smp_mb__after_atomic_inc(); 766 spin_unlock_bh(&port->sep_alua_lock); 767 /* 768 * Grab a configfs group dependency that is released 769 * for the exception path at label out: below, or upon 770 * completion of adding ALL_TG_PT=1 registrations in 771 * __core_scsi3_add_registration() 772 */ 773 ret = core_scsi3_lunacl_depend_item(deve_tmp); 774 if (ret < 0) { 775 pr_err("core_scsi3_lunacl_depend" 776 "_item() failed\n"); 777 atomic_dec(&port->sep_tg_pt_ref_cnt); 778 smp_mb__after_atomic_dec(); 779 atomic_dec(&deve_tmp->pr_ref_count); 780 smp_mb__after_atomic_dec(); 781 goto out; 782 } 783 /* 784 * Located a matching SCSI Initiator Port on a different 785 * port, allocate the pr_reg_atp and attach it to the 786 * pr_reg->pr_reg_atp_list that will be processed once 787 * the original *pr_reg is processed in 788 * __core_scsi3_add_registration() 789 */ 790 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 791 nacl_tmp, deve_tmp, NULL, 792 sa_res_key, all_tg_pt, aptpl); 793 if (!pr_reg_atp) { 794 atomic_dec(&port->sep_tg_pt_ref_cnt); 795 smp_mb__after_atomic_dec(); 796 atomic_dec(&deve_tmp->pr_ref_count); 797 smp_mb__after_atomic_dec(); 798 core_scsi3_lunacl_undepend_item(deve_tmp); 799 goto out; 800 } 801 802 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 803 &pr_reg->pr_reg_atp_list); 804 spin_lock_bh(&port->sep_alua_lock); 805 } 806 spin_unlock_bh(&port->sep_alua_lock); 807 808 spin_lock(&dev->se_port_lock); 809 atomic_dec(&port->sep_tg_pt_ref_cnt); 810 smp_mb__after_atomic_dec(); 811 } 812 spin_unlock(&dev->se_port_lock); 813 814 return pr_reg; 815 out: 816 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 817 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 818 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 819 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 820 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 821 } 822 kmem_cache_free(t10_pr_reg_cache, pr_reg); 823 return NULL; 824 } 825 826 int core_scsi3_alloc_aptpl_registration( 827 struct t10_reservation *pr_tmpl, 828 u64 sa_res_key, 829 unsigned char *i_port, 830 unsigned char *isid, 831 u32 mapped_lun, 832 unsigned char *t_port, 833 u16 tpgt, 834 u32 target_lun, 835 int res_holder, 836 int all_tg_pt, 837 u8 type) 838 { 839 struct t10_pr_registration *pr_reg; 840 841 if (!i_port || !t_port || !sa_res_key) { 842 pr_err("Illegal parameters for APTPL registration\n"); 843 return -EINVAL; 844 } 845 846 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 847 if (!pr_reg) { 848 pr_err("Unable to allocate struct t10_pr_registration\n"); 849 return -ENOMEM; 850 } 851 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 852 853 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 854 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 855 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 856 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 857 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 858 atomic_set(&pr_reg->pr_res_holders, 0); 859 pr_reg->pr_reg_nacl = NULL; 860 pr_reg->pr_reg_deve = NULL; 861 pr_reg->pr_res_mapped_lun = mapped_lun; 862 pr_reg->pr_aptpl_target_lun = target_lun; 863 pr_reg->pr_res_key = sa_res_key; 864 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 865 pr_reg->pr_reg_aptpl = 1; 866 pr_reg->pr_reg_tg_pt_lun = NULL; 867 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 868 pr_reg->pr_res_type = type; 869 /* 870 * If an ISID value had been saved in APTPL metadata for this 871 * SCSI Initiator Port, restore it now. 872 */ 873 if (isid != NULL) { 874 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 875 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 876 pr_reg->isid_present_at_reg = 1; 877 } 878 /* 879 * Copy the i_port and t_port information from caller. 880 */ 881 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 882 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 883 pr_reg->pr_reg_tpgt = tpgt; 884 /* 885 * Set pr_res_holder from caller, the pr_reg who is the reservation 886 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 887 * the Initiator Node LUN ACL from the fabric module is created for 888 * this registration. 889 */ 890 pr_reg->pr_res_holder = res_holder; 891 892 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 893 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 894 " metadata\n", (res_holder) ? "+reservation" : ""); 895 return 0; 896 } 897 898 static void core_scsi3_aptpl_reserve( 899 struct se_device *dev, 900 struct se_portal_group *tpg, 901 struct se_node_acl *node_acl, 902 struct t10_pr_registration *pr_reg) 903 { 904 char i_buf[PR_REG_ISID_ID_LEN]; 905 int prf_isid; 906 907 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 908 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 909 PR_REG_ISID_ID_LEN); 910 911 spin_lock(&dev->dev_reservation_lock); 912 dev->dev_pr_res_holder = pr_reg; 913 spin_unlock(&dev->dev_reservation_lock); 914 915 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 916 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 917 tpg->se_tpg_tfo->get_fabric_name(), 918 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 919 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 920 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 921 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 922 (prf_isid) ? &i_buf[0] : ""); 923 } 924 925 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 926 struct t10_pr_registration *, int, int); 927 928 static int __core_scsi3_check_aptpl_registration( 929 struct se_device *dev, 930 struct se_portal_group *tpg, 931 struct se_lun *lun, 932 u32 target_lun, 933 struct se_node_acl *nacl, 934 struct se_dev_entry *deve) 935 { 936 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 937 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 938 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 939 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 940 u16 tpgt; 941 942 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 943 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 944 /* 945 * Copy Initiator Port information from struct se_node_acl 946 */ 947 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 948 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 949 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 950 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 951 /* 952 * Look for the matching registrations+reservation from those 953 * created from APTPL metadata. Note that multiple registrations 954 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 955 * TransportIDs. 956 */ 957 spin_lock(&pr_tmpl->aptpl_reg_lock); 958 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 959 pr_reg_aptpl_list) { 960 if (!strcmp(pr_reg->pr_iport, i_port) && 961 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 962 !(strcmp(pr_reg->pr_tport, t_port)) && 963 (pr_reg->pr_reg_tpgt == tpgt) && 964 (pr_reg->pr_aptpl_target_lun == target_lun)) { 965 966 pr_reg->pr_reg_nacl = nacl; 967 pr_reg->pr_reg_deve = deve; 968 pr_reg->pr_reg_tg_pt_lun = lun; 969 970 list_del(&pr_reg->pr_reg_aptpl_list); 971 spin_unlock(&pr_tmpl->aptpl_reg_lock); 972 /* 973 * At this point all of the pointers in *pr_reg will 974 * be setup, so go ahead and add the registration. 975 */ 976 977 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 978 /* 979 * If this registration is the reservation holder, 980 * make that happen now.. 981 */ 982 if (pr_reg->pr_res_holder) 983 core_scsi3_aptpl_reserve(dev, tpg, 984 nacl, pr_reg); 985 /* 986 * Reenable pr_aptpl_active to accept new metadata 987 * updates once the SCSI device is active again.. 988 */ 989 spin_lock(&pr_tmpl->aptpl_reg_lock); 990 pr_tmpl->pr_aptpl_active = 1; 991 } 992 } 993 spin_unlock(&pr_tmpl->aptpl_reg_lock); 994 995 return 0; 996 } 997 998 int core_scsi3_check_aptpl_registration( 999 struct se_device *dev, 1000 struct se_portal_group *tpg, 1001 struct se_lun *lun, 1002 struct se_lun_acl *lun_acl) 1003 { 1004 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1005 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 1006 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun]; 1007 1008 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 1009 return 0; 1010 1011 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1012 lun->unpacked_lun, nacl, deve); 1013 } 1014 1015 static void __core_scsi3_dump_registration( 1016 struct target_core_fabric_ops *tfo, 1017 struct se_device *dev, 1018 struct se_node_acl *nacl, 1019 struct t10_pr_registration *pr_reg, 1020 int register_type) 1021 { 1022 struct se_portal_group *se_tpg = nacl->se_tpg; 1023 char i_buf[PR_REG_ISID_ID_LEN]; 1024 int prf_isid; 1025 1026 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1027 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1028 PR_REG_ISID_ID_LEN); 1029 1030 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1031 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1032 "_AND_MOVE" : (register_type == 1) ? 1033 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1034 (prf_isid) ? i_buf : ""); 1035 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1036 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1037 tfo->tpg_get_tag(se_tpg)); 1038 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1039 " Port(s)\n", tfo->get_fabric_name(), 1040 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1041 dev->transport->name); 1042 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1043 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1044 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1045 pr_reg->pr_reg_aptpl); 1046 } 1047 1048 /* 1049 * this function can be called with struct se_device->dev_reservation_lock 1050 * when register_move = 1 1051 */ 1052 static void __core_scsi3_add_registration( 1053 struct se_device *dev, 1054 struct se_node_acl *nacl, 1055 struct t10_pr_registration *pr_reg, 1056 int register_type, 1057 int register_move) 1058 { 1059 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1060 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1061 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1062 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1063 1064 /* 1065 * Increment PRgeneration counter for struct se_device upon a successful 1066 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1067 * 1068 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1069 * action, the struct se_device->dev_reservation_lock will already be held, 1070 * so we do not call core_scsi3_pr_generation() which grabs the lock 1071 * for the REGISTER. 1072 */ 1073 pr_reg->pr_res_generation = (register_move) ? 1074 su_dev->t10_pr.pr_generation++ : 1075 core_scsi3_pr_generation(dev); 1076 1077 spin_lock(&pr_tmpl->registration_lock); 1078 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1079 pr_reg->pr_reg_deve->def_pr_registered = 1; 1080 1081 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1082 spin_unlock(&pr_tmpl->registration_lock); 1083 /* 1084 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1085 */ 1086 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1087 return; 1088 /* 1089 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1090 * allocated in __core_scsi3_alloc_registration() 1091 */ 1092 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1093 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1094 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1095 1096 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1097 1098 spin_lock(&pr_tmpl->registration_lock); 1099 list_add_tail(&pr_reg_tmp->pr_reg_list, 1100 &pr_tmpl->registration_list); 1101 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1102 1103 __core_scsi3_dump_registration(tfo, dev, 1104 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1105 register_type); 1106 spin_unlock(&pr_tmpl->registration_lock); 1107 /* 1108 * Drop configfs group dependency reference from 1109 * __core_scsi3_alloc_registration() 1110 */ 1111 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1112 } 1113 } 1114 1115 static int core_scsi3_alloc_registration( 1116 struct se_device *dev, 1117 struct se_node_acl *nacl, 1118 struct se_dev_entry *deve, 1119 unsigned char *isid, 1120 u64 sa_res_key, 1121 int all_tg_pt, 1122 int aptpl, 1123 int register_type, 1124 int register_move) 1125 { 1126 struct t10_pr_registration *pr_reg; 1127 1128 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1129 sa_res_key, all_tg_pt, aptpl); 1130 if (!pr_reg) 1131 return -EPERM; 1132 1133 __core_scsi3_add_registration(dev, nacl, pr_reg, 1134 register_type, register_move); 1135 return 0; 1136 } 1137 1138 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1139 struct se_device *dev, 1140 struct se_node_acl *nacl, 1141 unsigned char *isid) 1142 { 1143 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1144 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1145 struct se_portal_group *tpg; 1146 1147 spin_lock(&pr_tmpl->registration_lock); 1148 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1149 &pr_tmpl->registration_list, pr_reg_list) { 1150 /* 1151 * First look for a matching struct se_node_acl 1152 */ 1153 if (pr_reg->pr_reg_nacl != nacl) 1154 continue; 1155 1156 tpg = pr_reg->pr_reg_nacl->se_tpg; 1157 /* 1158 * If this registration does NOT contain a fabric provided 1159 * ISID, then we have found a match. 1160 */ 1161 if (!pr_reg->isid_present_at_reg) { 1162 /* 1163 * Determine if this SCSI device server requires that 1164 * SCSI Intiatior TransportID w/ ISIDs is enforced 1165 * for fabric modules (iSCSI) requiring them. 1166 */ 1167 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1168 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1169 continue; 1170 } 1171 atomic_inc(&pr_reg->pr_res_holders); 1172 smp_mb__after_atomic_inc(); 1173 spin_unlock(&pr_tmpl->registration_lock); 1174 return pr_reg; 1175 } 1176 /* 1177 * If the *pr_reg contains a fabric defined ISID for multi-value 1178 * SCSI Initiator Port TransportIDs, then we expect a valid 1179 * matching ISID to be provided by the local SCSI Initiator Port. 1180 */ 1181 if (!isid) 1182 continue; 1183 if (strcmp(isid, pr_reg->pr_reg_isid)) 1184 continue; 1185 1186 atomic_inc(&pr_reg->pr_res_holders); 1187 smp_mb__after_atomic_inc(); 1188 spin_unlock(&pr_tmpl->registration_lock); 1189 return pr_reg; 1190 } 1191 spin_unlock(&pr_tmpl->registration_lock); 1192 1193 return NULL; 1194 } 1195 1196 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1197 struct se_device *dev, 1198 struct se_node_acl *nacl, 1199 struct se_session *sess) 1200 { 1201 struct se_portal_group *tpg = nacl->se_tpg; 1202 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1203 1204 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1205 memset(&buf[0], 0, PR_REG_ISID_LEN); 1206 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1207 PR_REG_ISID_LEN); 1208 isid_ptr = &buf[0]; 1209 } 1210 1211 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1212 } 1213 1214 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1215 { 1216 atomic_dec(&pr_reg->pr_res_holders); 1217 smp_mb__after_atomic_dec(); 1218 } 1219 1220 static int core_scsi3_check_implict_release( 1221 struct se_device *dev, 1222 struct t10_pr_registration *pr_reg) 1223 { 1224 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1225 struct t10_pr_registration *pr_res_holder; 1226 int ret = 0; 1227 1228 spin_lock(&dev->dev_reservation_lock); 1229 pr_res_holder = dev->dev_pr_res_holder; 1230 if (!pr_res_holder) { 1231 spin_unlock(&dev->dev_reservation_lock); 1232 return ret; 1233 } 1234 if (pr_res_holder == pr_reg) { 1235 /* 1236 * Perform an implict RELEASE if the registration that 1237 * is being released is holding the reservation. 1238 * 1239 * From spc4r17, section 5.7.11.1: 1240 * 1241 * e) If the I_T nexus is the persistent reservation holder 1242 * and the persistent reservation is not an all registrants 1243 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1244 * service action or REGISTER AND IGNORE EXISTING KEY 1245 * service action with the SERVICE ACTION RESERVATION KEY 1246 * field set to zero (see 5.7.11.3). 1247 */ 1248 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1249 ret = 1; 1250 /* 1251 * For 'All Registrants' reservation types, all existing 1252 * registrations are still processed as reservation holders 1253 * in core_scsi3_pr_seq_non_holder() after the initial 1254 * reservation holder is implictly released here. 1255 */ 1256 } else if (pr_reg->pr_reg_all_tg_pt && 1257 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1258 pr_reg->pr_reg_nacl->initiatorname)) && 1259 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1260 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1261 " UNREGISTER while existing reservation with matching" 1262 " key 0x%016Lx is present from another SCSI Initiator" 1263 " Port\n", pr_reg->pr_res_key); 1264 ret = -EPERM; 1265 } 1266 spin_unlock(&dev->dev_reservation_lock); 1267 1268 return ret; 1269 } 1270 1271 /* 1272 * Called with struct t10_reservation->registration_lock held. 1273 */ 1274 static void __core_scsi3_free_registration( 1275 struct se_device *dev, 1276 struct t10_pr_registration *pr_reg, 1277 struct list_head *preempt_and_abort_list, 1278 int dec_holders) 1279 { 1280 struct target_core_fabric_ops *tfo = 1281 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1282 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1283 char i_buf[PR_REG_ISID_ID_LEN]; 1284 int prf_isid; 1285 1286 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1287 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1288 PR_REG_ISID_ID_LEN); 1289 1290 pr_reg->pr_reg_deve->def_pr_registered = 0; 1291 pr_reg->pr_reg_deve->pr_res_key = 0; 1292 list_del(&pr_reg->pr_reg_list); 1293 /* 1294 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1295 * so call core_scsi3_put_pr_reg() to decrement our reference. 1296 */ 1297 if (dec_holders) 1298 core_scsi3_put_pr_reg(pr_reg); 1299 /* 1300 * Wait until all reference from any other I_T nexuses for this 1301 * *pr_reg have been released. Because list_del() is called above, 1302 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1303 * count back to zero, and we release *pr_reg. 1304 */ 1305 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1306 spin_unlock(&pr_tmpl->registration_lock); 1307 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1308 tfo->get_fabric_name()); 1309 cpu_relax(); 1310 spin_lock(&pr_tmpl->registration_lock); 1311 } 1312 1313 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1314 " Node: %s%s\n", tfo->get_fabric_name(), 1315 pr_reg->pr_reg_nacl->initiatorname, 1316 (prf_isid) ? &i_buf[0] : ""); 1317 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1318 " Port(s)\n", tfo->get_fabric_name(), 1319 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1320 dev->transport->name); 1321 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1322 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1323 pr_reg->pr_res_generation); 1324 1325 if (!preempt_and_abort_list) { 1326 pr_reg->pr_reg_deve = NULL; 1327 pr_reg->pr_reg_nacl = NULL; 1328 kfree(pr_reg->pr_aptpl_buf); 1329 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1330 return; 1331 } 1332 /* 1333 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1334 * are released once the ABORT_TASK_SET has completed.. 1335 */ 1336 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1337 } 1338 1339 void core_scsi3_free_pr_reg_from_nacl( 1340 struct se_device *dev, 1341 struct se_node_acl *nacl) 1342 { 1343 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1344 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1345 /* 1346 * If the passed se_node_acl matches the reservation holder, 1347 * release the reservation. 1348 */ 1349 spin_lock(&dev->dev_reservation_lock); 1350 pr_res_holder = dev->dev_pr_res_holder; 1351 if ((pr_res_holder != NULL) && 1352 (pr_res_holder->pr_reg_nacl == nacl)) 1353 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1354 spin_unlock(&dev->dev_reservation_lock); 1355 /* 1356 * Release any registration associated with the struct se_node_acl. 1357 */ 1358 spin_lock(&pr_tmpl->registration_lock); 1359 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1360 &pr_tmpl->registration_list, pr_reg_list) { 1361 1362 if (pr_reg->pr_reg_nacl != nacl) 1363 continue; 1364 1365 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1366 } 1367 spin_unlock(&pr_tmpl->registration_lock); 1368 } 1369 1370 void core_scsi3_free_all_registrations( 1371 struct se_device *dev) 1372 { 1373 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1374 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1375 1376 spin_lock(&dev->dev_reservation_lock); 1377 pr_res_holder = dev->dev_pr_res_holder; 1378 if (pr_res_holder != NULL) { 1379 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1380 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1381 pr_res_holder, 0); 1382 } 1383 spin_unlock(&dev->dev_reservation_lock); 1384 1385 spin_lock(&pr_tmpl->registration_lock); 1386 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1387 &pr_tmpl->registration_list, pr_reg_list) { 1388 1389 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1390 } 1391 spin_unlock(&pr_tmpl->registration_lock); 1392 1393 spin_lock(&pr_tmpl->aptpl_reg_lock); 1394 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1395 pr_reg_aptpl_list) { 1396 list_del(&pr_reg->pr_reg_aptpl_list); 1397 kfree(pr_reg->pr_aptpl_buf); 1398 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1399 } 1400 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1401 } 1402 1403 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1404 { 1405 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1406 &tpg->tpg_group.cg_item); 1407 } 1408 1409 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1410 { 1411 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1412 &tpg->tpg_group.cg_item); 1413 1414 atomic_dec(&tpg->tpg_pr_ref_count); 1415 smp_mb__after_atomic_dec(); 1416 } 1417 1418 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1419 { 1420 struct se_portal_group *tpg = nacl->se_tpg; 1421 1422 if (nacl->dynamic_node_acl) 1423 return 0; 1424 1425 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1426 &nacl->acl_group.cg_item); 1427 } 1428 1429 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1430 { 1431 struct se_portal_group *tpg = nacl->se_tpg; 1432 1433 if (nacl->dynamic_node_acl) { 1434 atomic_dec(&nacl->acl_pr_ref_count); 1435 smp_mb__after_atomic_dec(); 1436 return; 1437 } 1438 1439 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1440 &nacl->acl_group.cg_item); 1441 1442 atomic_dec(&nacl->acl_pr_ref_count); 1443 smp_mb__after_atomic_dec(); 1444 } 1445 1446 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1447 { 1448 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1449 struct se_node_acl *nacl; 1450 struct se_portal_group *tpg; 1451 /* 1452 * For nacl->dynamic_node_acl=1 1453 */ 1454 if (!lun_acl) 1455 return 0; 1456 1457 nacl = lun_acl->se_lun_nacl; 1458 tpg = nacl->se_tpg; 1459 1460 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1461 &lun_acl->se_lun_group.cg_item); 1462 } 1463 1464 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1465 { 1466 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1467 struct se_node_acl *nacl; 1468 struct se_portal_group *tpg; 1469 /* 1470 * For nacl->dynamic_node_acl=1 1471 */ 1472 if (!lun_acl) { 1473 atomic_dec(&se_deve->pr_ref_count); 1474 smp_mb__after_atomic_dec(); 1475 return; 1476 } 1477 nacl = lun_acl->se_lun_nacl; 1478 tpg = nacl->se_tpg; 1479 1480 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1481 &lun_acl->se_lun_group.cg_item); 1482 1483 atomic_dec(&se_deve->pr_ref_count); 1484 smp_mb__after_atomic_dec(); 1485 } 1486 1487 static int core_scsi3_decode_spec_i_port( 1488 struct se_cmd *cmd, 1489 struct se_portal_group *tpg, 1490 unsigned char *l_isid, 1491 u64 sa_res_key, 1492 int all_tg_pt, 1493 int aptpl) 1494 { 1495 struct se_device *dev = cmd->se_dev; 1496 struct se_port *tmp_port; 1497 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1498 struct se_session *se_sess = cmd->se_sess; 1499 struct se_node_acl *dest_node_acl = NULL; 1500 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1501 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1502 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1503 LIST_HEAD(tid_dest_list); 1504 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1505 struct target_core_fabric_ops *tmp_tf_ops; 1506 unsigned char *buf; 1507 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1508 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1509 u32 tpdl, tid_len = 0; 1510 int ret, dest_local_nexus, prf_isid; 1511 u32 dest_rtpi = 0; 1512 1513 memset(dest_iport, 0, 64); 1514 1515 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1516 /* 1517 * Allocate a struct pr_transport_id_holder and setup the 1518 * local_node_acl and local_se_deve pointers and add to 1519 * struct list_head tid_dest_list for add registration 1520 * processing in the loop of tid_dest_list below. 1521 */ 1522 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1523 if (!tidh_new) { 1524 pr_err("Unable to allocate tidh_new\n"); 1525 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1526 return -EINVAL; 1527 } 1528 INIT_LIST_HEAD(&tidh_new->dest_list); 1529 tidh_new->dest_tpg = tpg; 1530 tidh_new->dest_node_acl = se_sess->se_node_acl; 1531 tidh_new->dest_se_deve = local_se_deve; 1532 1533 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1534 se_sess->se_node_acl, local_se_deve, l_isid, 1535 sa_res_key, all_tg_pt, aptpl); 1536 if (!local_pr_reg) { 1537 kfree(tidh_new); 1538 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1539 return -ENOMEM; 1540 } 1541 tidh_new->dest_pr_reg = local_pr_reg; 1542 /* 1543 * The local I_T nexus does not hold any configfs dependances, 1544 * so we set tid_h->dest_local_nexus=1 to prevent the 1545 * configfs_undepend_item() calls in the tid_dest_list loops below. 1546 */ 1547 tidh_new->dest_local_nexus = 1; 1548 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1549 1550 buf = transport_kmap_data_sg(cmd); 1551 /* 1552 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1553 * first extract TransportID Parameter Data Length, and make sure 1554 * the value matches up to the SCSI expected data transfer length. 1555 */ 1556 tpdl = (buf[24] & 0xff) << 24; 1557 tpdl |= (buf[25] & 0xff) << 16; 1558 tpdl |= (buf[26] & 0xff) << 8; 1559 tpdl |= buf[27] & 0xff; 1560 1561 if ((tpdl + 28) != cmd->data_length) { 1562 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1563 " does not equal CDB data_length: %u\n", tpdl, 1564 cmd->data_length); 1565 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1566 ret = -EINVAL; 1567 goto out; 1568 } 1569 /* 1570 * Start processing the received transport IDs using the 1571 * receiving I_T Nexus portal's fabric dependent methods to 1572 * obtain the SCSI Initiator Port/Device Identifiers. 1573 */ 1574 ptr = &buf[28]; 1575 1576 while (tpdl > 0) { 1577 proto_ident = (ptr[0] & 0x0f); 1578 dest_tpg = NULL; 1579 1580 spin_lock(&dev->se_port_lock); 1581 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1582 tmp_tpg = tmp_port->sep_tpg; 1583 if (!tmp_tpg) 1584 continue; 1585 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1586 if (!tmp_tf_ops) 1587 continue; 1588 if (!tmp_tf_ops->get_fabric_proto_ident || 1589 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1590 continue; 1591 /* 1592 * Look for the matching proto_ident provided by 1593 * the received TransportID 1594 */ 1595 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1596 if (tmp_proto_ident != proto_ident) 1597 continue; 1598 dest_rtpi = tmp_port->sep_rtpi; 1599 1600 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1601 tmp_tpg, (const char *)ptr, &tid_len, 1602 &iport_ptr); 1603 if (!i_str) 1604 continue; 1605 1606 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1607 smp_mb__after_atomic_inc(); 1608 spin_unlock(&dev->se_port_lock); 1609 1610 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1611 if (ret != 0) { 1612 pr_err(" core_scsi3_tpg_depend_item()" 1613 " for tmp_tpg\n"); 1614 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1615 smp_mb__after_atomic_dec(); 1616 cmd->scsi_sense_reason = 1617 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1618 ret = -EINVAL; 1619 goto out; 1620 } 1621 /* 1622 * Locate the desination initiator ACL to be registered 1623 * from the decoded fabric module specific TransportID 1624 * at *i_str. 1625 */ 1626 spin_lock_irq(&tmp_tpg->acl_node_lock); 1627 dest_node_acl = __core_tpg_get_initiator_node_acl( 1628 tmp_tpg, i_str); 1629 if (dest_node_acl) { 1630 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1631 smp_mb__after_atomic_inc(); 1632 } 1633 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1634 1635 if (!dest_node_acl) { 1636 core_scsi3_tpg_undepend_item(tmp_tpg); 1637 spin_lock(&dev->se_port_lock); 1638 continue; 1639 } 1640 1641 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1642 if (ret != 0) { 1643 pr_err("configfs_depend_item() failed" 1644 " for dest_node_acl->acl_group\n"); 1645 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1646 smp_mb__after_atomic_dec(); 1647 core_scsi3_tpg_undepend_item(tmp_tpg); 1648 cmd->scsi_sense_reason = 1649 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1650 ret = -EINVAL; 1651 goto out; 1652 } 1653 1654 dest_tpg = tmp_tpg; 1655 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1656 " %s Port RTPI: %hu\n", 1657 dest_tpg->se_tpg_tfo->get_fabric_name(), 1658 dest_node_acl->initiatorname, dest_rtpi); 1659 1660 spin_lock(&dev->se_port_lock); 1661 break; 1662 } 1663 spin_unlock(&dev->se_port_lock); 1664 1665 if (!dest_tpg) { 1666 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1667 " dest_tpg\n"); 1668 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1669 ret = -EINVAL; 1670 goto out; 1671 } 1672 #if 0 1673 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1674 " tid_len: %d for %s + %s\n", 1675 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1676 tpdl, tid_len, i_str, iport_ptr); 1677 #endif 1678 if (tid_len > tpdl) { 1679 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1680 " %u for Transport ID: %s\n", tid_len, ptr); 1681 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1682 core_scsi3_tpg_undepend_item(dest_tpg); 1683 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1684 ret = -EINVAL; 1685 goto out; 1686 } 1687 /* 1688 * Locate the desintation struct se_dev_entry pointer for matching 1689 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1690 * Target Port. 1691 */ 1692 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1693 dest_rtpi); 1694 if (!dest_se_deve) { 1695 pr_err("Unable to locate %s dest_se_deve" 1696 " from destination RTPI: %hu\n", 1697 dest_tpg->se_tpg_tfo->get_fabric_name(), 1698 dest_rtpi); 1699 1700 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1701 core_scsi3_tpg_undepend_item(dest_tpg); 1702 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1703 ret = -EINVAL; 1704 goto out; 1705 } 1706 1707 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1708 if (ret < 0) { 1709 pr_err("core_scsi3_lunacl_depend_item()" 1710 " failed\n"); 1711 atomic_dec(&dest_se_deve->pr_ref_count); 1712 smp_mb__after_atomic_dec(); 1713 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1714 core_scsi3_tpg_undepend_item(dest_tpg); 1715 cmd->scsi_sense_reason = 1716 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1717 ret = -EINVAL; 1718 goto out; 1719 } 1720 #if 0 1721 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1722 " dest_se_deve mapped_lun: %u\n", 1723 dest_tpg->se_tpg_tfo->get_fabric_name(), 1724 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1725 #endif 1726 /* 1727 * Skip any TransportIDs that already have a registration for 1728 * this target port. 1729 */ 1730 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1731 iport_ptr); 1732 if (pr_reg_e) { 1733 core_scsi3_put_pr_reg(pr_reg_e); 1734 core_scsi3_lunacl_undepend_item(dest_se_deve); 1735 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1736 core_scsi3_tpg_undepend_item(dest_tpg); 1737 ptr += tid_len; 1738 tpdl -= tid_len; 1739 tid_len = 0; 1740 continue; 1741 } 1742 /* 1743 * Allocate a struct pr_transport_id_holder and setup 1744 * the dest_node_acl and dest_se_deve pointers for the 1745 * loop below. 1746 */ 1747 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1748 GFP_KERNEL); 1749 if (!tidh_new) { 1750 pr_err("Unable to allocate tidh_new\n"); 1751 core_scsi3_lunacl_undepend_item(dest_se_deve); 1752 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1753 core_scsi3_tpg_undepend_item(dest_tpg); 1754 cmd->scsi_sense_reason = 1755 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1756 ret = -ENOMEM; 1757 goto out; 1758 } 1759 INIT_LIST_HEAD(&tidh_new->dest_list); 1760 tidh_new->dest_tpg = dest_tpg; 1761 tidh_new->dest_node_acl = dest_node_acl; 1762 tidh_new->dest_se_deve = dest_se_deve; 1763 1764 /* 1765 * Allocate, but do NOT add the registration for the 1766 * TransportID referenced SCSI Initiator port. This 1767 * done because of the following from spc4r17 in section 1768 * 6.14.3 wrt SPEC_I_PT: 1769 * 1770 * "If a registration fails for any initiator port (e.g., if th 1771 * logical unit does not have enough resources available to 1772 * hold the registration information), no registrations shall be 1773 * made, and the command shall be terminated with 1774 * CHECK CONDITION status." 1775 * 1776 * That means we call __core_scsi3_alloc_registration() here, 1777 * and then call __core_scsi3_add_registration() in the 1778 * 2nd loop which will never fail. 1779 */ 1780 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1781 dest_node_acl, dest_se_deve, iport_ptr, 1782 sa_res_key, all_tg_pt, aptpl); 1783 if (!dest_pr_reg) { 1784 core_scsi3_lunacl_undepend_item(dest_se_deve); 1785 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1786 core_scsi3_tpg_undepend_item(dest_tpg); 1787 kfree(tidh_new); 1788 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1789 ret = -EINVAL; 1790 goto out; 1791 } 1792 tidh_new->dest_pr_reg = dest_pr_reg; 1793 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1794 1795 ptr += tid_len; 1796 tpdl -= tid_len; 1797 tid_len = 0; 1798 1799 } 1800 1801 transport_kunmap_data_sg(cmd); 1802 1803 /* 1804 * Go ahead and create a registrations from tid_dest_list for the 1805 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1806 * and dest_se_deve. 1807 * 1808 * The SA Reservation Key from the PROUT is set for the 1809 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1810 * means that the TransportID Initiator port will be 1811 * registered on all of the target ports in the SCSI target device 1812 * ALL_TG_PT=0 means the registration will only be for the 1813 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1814 * was received. 1815 */ 1816 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1817 dest_tpg = tidh->dest_tpg; 1818 dest_node_acl = tidh->dest_node_acl; 1819 dest_se_deve = tidh->dest_se_deve; 1820 dest_pr_reg = tidh->dest_pr_reg; 1821 dest_local_nexus = tidh->dest_local_nexus; 1822 1823 list_del(&tidh->dest_list); 1824 kfree(tidh); 1825 1826 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1827 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1828 PR_REG_ISID_ID_LEN); 1829 1830 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1831 dest_pr_reg, 0, 0); 1832 1833 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1834 " registered Transport ID for Node: %s%s Mapped LUN:" 1835 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1836 dest_node_acl->initiatorname, (prf_isid) ? 1837 &i_buf[0] : "", dest_se_deve->mapped_lun); 1838 1839 if (dest_local_nexus) 1840 continue; 1841 1842 core_scsi3_lunacl_undepend_item(dest_se_deve); 1843 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1844 core_scsi3_tpg_undepend_item(dest_tpg); 1845 } 1846 1847 return 0; 1848 out: 1849 transport_kunmap_data_sg(cmd); 1850 /* 1851 * For the failure case, release everything from tid_dest_list 1852 * including *dest_pr_reg and the configfs dependances.. 1853 */ 1854 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1855 dest_tpg = tidh->dest_tpg; 1856 dest_node_acl = tidh->dest_node_acl; 1857 dest_se_deve = tidh->dest_se_deve; 1858 dest_pr_reg = tidh->dest_pr_reg; 1859 dest_local_nexus = tidh->dest_local_nexus; 1860 1861 list_del(&tidh->dest_list); 1862 kfree(tidh); 1863 /* 1864 * Release any extra ALL_TG_PT=1 registrations for 1865 * the SPEC_I_PT=1 case. 1866 */ 1867 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1868 &dest_pr_reg->pr_reg_atp_list, 1869 pr_reg_atp_mem_list) { 1870 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1871 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1872 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1873 } 1874 1875 kfree(dest_pr_reg->pr_aptpl_buf); 1876 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1877 1878 if (dest_local_nexus) 1879 continue; 1880 1881 core_scsi3_lunacl_undepend_item(dest_se_deve); 1882 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1883 core_scsi3_tpg_undepend_item(dest_tpg); 1884 } 1885 return ret; 1886 } 1887 1888 /* 1889 * Called with struct se_device->dev_reservation_lock held 1890 */ 1891 static int __core_scsi3_update_aptpl_buf( 1892 struct se_device *dev, 1893 unsigned char *buf, 1894 u32 pr_aptpl_buf_len, 1895 int clear_aptpl_metadata) 1896 { 1897 struct se_lun *lun; 1898 struct se_portal_group *tpg; 1899 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1900 struct t10_pr_registration *pr_reg; 1901 unsigned char tmp[512], isid_buf[32]; 1902 ssize_t len = 0; 1903 int reg_count = 0; 1904 1905 memset(buf, 0, pr_aptpl_buf_len); 1906 /* 1907 * Called to clear metadata once APTPL has been deactivated. 1908 */ 1909 if (clear_aptpl_metadata) { 1910 snprintf(buf, pr_aptpl_buf_len, 1911 "No Registrations or Reservations\n"); 1912 return 0; 1913 } 1914 /* 1915 * Walk the registration list.. 1916 */ 1917 spin_lock(&su_dev->t10_pr.registration_lock); 1918 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1919 pr_reg_list) { 1920 1921 tmp[0] = '\0'; 1922 isid_buf[0] = '\0'; 1923 tpg = pr_reg->pr_reg_nacl->se_tpg; 1924 lun = pr_reg->pr_reg_tg_pt_lun; 1925 /* 1926 * Write out any ISID value to APTPL metadata that was included 1927 * in the original registration. 1928 */ 1929 if (pr_reg->isid_present_at_reg) 1930 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1931 pr_reg->pr_reg_isid); 1932 /* 1933 * Include special metadata if the pr_reg matches the 1934 * reservation holder. 1935 */ 1936 if (dev->dev_pr_res_holder == pr_reg) { 1937 snprintf(tmp, 512, "PR_REG_START: %d" 1938 "\ninitiator_fabric=%s\n" 1939 "initiator_node=%s\n%s" 1940 "sa_res_key=%llu\n" 1941 "res_holder=1\nres_type=%02x\n" 1942 "res_scope=%02x\nres_all_tg_pt=%d\n" 1943 "mapped_lun=%u\n", reg_count, 1944 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_res_type, 1947 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1948 pr_reg->pr_res_mapped_lun); 1949 } else { 1950 snprintf(tmp, 512, "PR_REG_START: %d\n" 1951 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1952 "sa_res_key=%llu\nres_holder=0\n" 1953 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1954 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1955 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1956 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1957 pr_reg->pr_res_mapped_lun); 1958 } 1959 1960 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1961 pr_err("Unable to update renaming" 1962 " APTPL metadata\n"); 1963 spin_unlock(&su_dev->t10_pr.registration_lock); 1964 return -EMSGSIZE; 1965 } 1966 len += sprintf(buf+len, "%s", tmp); 1967 1968 /* 1969 * Include information about the associated SCSI target port. 1970 */ 1971 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1972 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1973 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1974 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1975 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1976 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1977 1978 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1979 pr_err("Unable to update renaming" 1980 " APTPL metadata\n"); 1981 spin_unlock(&su_dev->t10_pr.registration_lock); 1982 return -EMSGSIZE; 1983 } 1984 len += sprintf(buf+len, "%s", tmp); 1985 reg_count++; 1986 } 1987 spin_unlock(&su_dev->t10_pr.registration_lock); 1988 1989 if (!reg_count) 1990 len += sprintf(buf+len, "No Registrations or Reservations"); 1991 1992 return 0; 1993 } 1994 1995 static int core_scsi3_update_aptpl_buf( 1996 struct se_device *dev, 1997 unsigned char *buf, 1998 u32 pr_aptpl_buf_len, 1999 int clear_aptpl_metadata) 2000 { 2001 int ret; 2002 2003 spin_lock(&dev->dev_reservation_lock); 2004 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2005 clear_aptpl_metadata); 2006 spin_unlock(&dev->dev_reservation_lock); 2007 2008 return ret; 2009 } 2010 2011 /* 2012 * Called with struct se_device->aptpl_file_mutex held 2013 */ 2014 static int __core_scsi3_write_aptpl_to_file( 2015 struct se_device *dev, 2016 unsigned char *buf, 2017 u32 pr_aptpl_buf_len) 2018 { 2019 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2020 struct file *file; 2021 struct iovec iov[1]; 2022 mm_segment_t old_fs; 2023 int flags = O_RDWR | O_CREAT | O_TRUNC; 2024 char path[512]; 2025 int ret; 2026 2027 memset(iov, 0, sizeof(struct iovec)); 2028 memset(path, 0, 512); 2029 2030 if (strlen(&wwn->unit_serial[0]) >= 512) { 2031 pr_err("WWN value for struct se_device does not fit" 2032 " into path buffer\n"); 2033 return -EMSGSIZE; 2034 } 2035 2036 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2037 file = filp_open(path, flags, 0600); 2038 if (IS_ERR(file) || !file || !file->f_dentry) { 2039 pr_err("filp_open(%s) for APTPL metadata" 2040 " failed\n", path); 2041 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT); 2042 } 2043 2044 iov[0].iov_base = &buf[0]; 2045 if (!pr_aptpl_buf_len) 2046 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2047 else 2048 iov[0].iov_len = pr_aptpl_buf_len; 2049 2050 old_fs = get_fs(); 2051 set_fs(get_ds()); 2052 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2053 set_fs(old_fs); 2054 2055 if (ret < 0) { 2056 pr_debug("Error writing APTPL metadata file: %s\n", path); 2057 filp_close(file, NULL); 2058 return -EIO; 2059 } 2060 filp_close(file, NULL); 2061 2062 return 0; 2063 } 2064 2065 static int core_scsi3_update_and_write_aptpl( 2066 struct se_device *dev, 2067 unsigned char *in_buf, 2068 u32 in_pr_aptpl_buf_len) 2069 { 2070 unsigned char null_buf[64], *buf; 2071 u32 pr_aptpl_buf_len; 2072 int ret, clear_aptpl_metadata = 0; 2073 /* 2074 * Can be called with a NULL pointer from PROUT service action CLEAR 2075 */ 2076 if (!in_buf) { 2077 memset(null_buf, 0, 64); 2078 buf = &null_buf[0]; 2079 /* 2080 * This will clear the APTPL metadata to: 2081 * "No Registrations or Reservations" status 2082 */ 2083 pr_aptpl_buf_len = 64; 2084 clear_aptpl_metadata = 1; 2085 } else { 2086 buf = in_buf; 2087 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2088 } 2089 2090 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2091 clear_aptpl_metadata); 2092 if (ret != 0) 2093 return ret; 2094 /* 2095 * __core_scsi3_write_aptpl_to_file() will call strlen() 2096 * on the passed buf to determine pr_aptpl_buf_len. 2097 */ 2098 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2099 if (ret != 0) 2100 return ret; 2101 2102 return ret; 2103 } 2104 2105 static int core_scsi3_emulate_pro_register( 2106 struct se_cmd *cmd, 2107 u64 res_key, 2108 u64 sa_res_key, 2109 int aptpl, 2110 int all_tg_pt, 2111 int spec_i_pt, 2112 int ignore_key) 2113 { 2114 struct se_session *se_sess = cmd->se_sess; 2115 struct se_device *dev = cmd->se_dev; 2116 struct se_dev_entry *se_deve; 2117 struct se_lun *se_lun = cmd->se_lun; 2118 struct se_portal_group *se_tpg; 2119 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2120 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2121 /* Used for APTPL metadata w/ UNREGISTER */ 2122 unsigned char *pr_aptpl_buf = NULL; 2123 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2124 int pr_holder = 0, ret = 0, type; 2125 2126 if (!se_sess || !se_lun) { 2127 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2128 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2129 return -EINVAL; 2130 } 2131 se_tpg = se_sess->se_tpg; 2132 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2133 2134 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2135 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2136 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2137 PR_REG_ISID_LEN); 2138 isid_ptr = &isid_buf[0]; 2139 } 2140 /* 2141 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2142 */ 2143 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2144 if (!pr_reg_e) { 2145 if (res_key) { 2146 pr_warn("SPC-3 PR: Reservation Key non-zero" 2147 " for SA REGISTER, returning CONFLICT\n"); 2148 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2149 return -EINVAL; 2150 } 2151 /* 2152 * Do nothing but return GOOD status. 2153 */ 2154 if (!sa_res_key) 2155 return 0; 2156 2157 if (!spec_i_pt) { 2158 /* 2159 * Perform the Service Action REGISTER on the Initiator 2160 * Port Endpoint that the PRO was received from on the 2161 * Logical Unit of the SCSI device server. 2162 */ 2163 ret = core_scsi3_alloc_registration(cmd->se_dev, 2164 se_sess->se_node_acl, se_deve, isid_ptr, 2165 sa_res_key, all_tg_pt, aptpl, 2166 ignore_key, 0); 2167 if (ret != 0) { 2168 pr_err("Unable to allocate" 2169 " struct t10_pr_registration\n"); 2170 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2171 return -EINVAL; 2172 } 2173 } else { 2174 /* 2175 * Register both the Initiator port that received 2176 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2177 * TransportID from Parameter list and loop through 2178 * fabric dependent parameter list while calling 2179 * logic from of core_scsi3_alloc_registration() for 2180 * each TransportID provided SCSI Initiator Port/Device 2181 */ 2182 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2183 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2184 if (ret != 0) 2185 return ret; 2186 } 2187 /* 2188 * Nothing left to do for the APTPL=0 case. 2189 */ 2190 if (!aptpl) { 2191 pr_tmpl->pr_aptpl_active = 0; 2192 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2193 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2194 " REGISTER\n"); 2195 return 0; 2196 } 2197 /* 2198 * Locate the newly allocated local I_T Nexus *pr_reg, and 2199 * update the APTPL metadata information using its 2200 * preallocated *pr_reg->pr_aptpl_buf. 2201 */ 2202 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2203 se_sess->se_node_acl, se_sess); 2204 2205 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2206 &pr_reg->pr_aptpl_buf[0], 2207 pr_tmpl->pr_aptpl_buf_len); 2208 if (!ret) { 2209 pr_tmpl->pr_aptpl_active = 1; 2210 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2211 } 2212 2213 core_scsi3_put_pr_reg(pr_reg); 2214 return ret; 2215 } else { 2216 /* 2217 * Locate the existing *pr_reg via struct se_node_acl pointers 2218 */ 2219 pr_reg = pr_reg_e; 2220 type = pr_reg->pr_res_type; 2221 2222 if (!ignore_key) { 2223 if (res_key != pr_reg->pr_res_key) { 2224 pr_err("SPC-3 PR REGISTER: Received" 2225 " res_key: 0x%016Lx does not match" 2226 " existing SA REGISTER res_key:" 2227 " 0x%016Lx\n", res_key, 2228 pr_reg->pr_res_key); 2229 core_scsi3_put_pr_reg(pr_reg); 2230 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2231 return -EINVAL; 2232 } 2233 } 2234 if (spec_i_pt) { 2235 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2236 " set while sa_res_key=0\n"); 2237 core_scsi3_put_pr_reg(pr_reg); 2238 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2239 return -EINVAL; 2240 } 2241 /* 2242 * An existing ALL_TG_PT=1 registration being released 2243 * must also set ALL_TG_PT=1 in the incoming PROUT. 2244 */ 2245 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2246 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2247 " registration exists, but ALL_TG_PT=1 bit not" 2248 " present in received PROUT\n"); 2249 core_scsi3_put_pr_reg(pr_reg); 2250 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2251 return -EINVAL; 2252 } 2253 /* 2254 * Allocate APTPL metadata buffer used for UNREGISTER ops 2255 */ 2256 if (aptpl) { 2257 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2258 GFP_KERNEL); 2259 if (!pr_aptpl_buf) { 2260 pr_err("Unable to allocate" 2261 " pr_aptpl_buf\n"); 2262 core_scsi3_put_pr_reg(pr_reg); 2263 cmd->scsi_sense_reason = 2264 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2265 return -EINVAL; 2266 } 2267 } 2268 /* 2269 * sa_res_key=0 Unregister Reservation Key for registered I_T 2270 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2271 * Nexus. 2272 */ 2273 if (!sa_res_key) { 2274 pr_holder = core_scsi3_check_implict_release( 2275 cmd->se_dev, pr_reg); 2276 if (pr_holder < 0) { 2277 kfree(pr_aptpl_buf); 2278 core_scsi3_put_pr_reg(pr_reg); 2279 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2280 return -EINVAL; 2281 } 2282 2283 spin_lock(&pr_tmpl->registration_lock); 2284 /* 2285 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2286 * and matching pr_res_key. 2287 */ 2288 if (pr_reg->pr_reg_all_tg_pt) { 2289 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2290 &pr_tmpl->registration_list, 2291 pr_reg_list) { 2292 2293 if (!pr_reg_p->pr_reg_all_tg_pt) 2294 continue; 2295 2296 if (pr_reg_p->pr_res_key != res_key) 2297 continue; 2298 2299 if (pr_reg == pr_reg_p) 2300 continue; 2301 2302 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2303 pr_reg_p->pr_reg_nacl->initiatorname)) 2304 continue; 2305 2306 __core_scsi3_free_registration(dev, 2307 pr_reg_p, NULL, 0); 2308 } 2309 } 2310 /* 2311 * Release the calling I_T Nexus registration now.. 2312 */ 2313 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2314 NULL, 1); 2315 /* 2316 * From spc4r17, section 5.7.11.3 Unregistering 2317 * 2318 * If the persistent reservation is a registrants only 2319 * type, the device server shall establish a unit 2320 * attention condition for the initiator port associated 2321 * with every registered I_T nexus except for the I_T 2322 * nexus on which the PERSISTENT RESERVE OUT command was 2323 * received, with the additional sense code set to 2324 * RESERVATIONS RELEASED. 2325 */ 2326 if (pr_holder && 2327 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2328 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2329 list_for_each_entry(pr_reg_p, 2330 &pr_tmpl->registration_list, 2331 pr_reg_list) { 2332 2333 core_scsi3_ua_allocate( 2334 pr_reg_p->pr_reg_nacl, 2335 pr_reg_p->pr_res_mapped_lun, 2336 0x2A, 2337 ASCQ_2AH_RESERVATIONS_RELEASED); 2338 } 2339 } 2340 spin_unlock(&pr_tmpl->registration_lock); 2341 2342 if (!aptpl) { 2343 pr_tmpl->pr_aptpl_active = 0; 2344 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2345 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2346 " for UNREGISTER\n"); 2347 return 0; 2348 } 2349 2350 ret = core_scsi3_update_and_write_aptpl(dev, 2351 &pr_aptpl_buf[0], 2352 pr_tmpl->pr_aptpl_buf_len); 2353 if (!ret) { 2354 pr_tmpl->pr_aptpl_active = 1; 2355 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2356 " for UNREGISTER\n"); 2357 } 2358 2359 kfree(pr_aptpl_buf); 2360 return ret; 2361 } else { 2362 /* 2363 * Increment PRgeneration counter for struct se_device" 2364 * upon a successful REGISTER, see spc4r17 section 6.3.2 2365 * READ_KEYS service action. 2366 */ 2367 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2368 cmd->se_dev); 2369 pr_reg->pr_res_key = sa_res_key; 2370 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2371 " Key for %s to: 0x%016Lx PRgeneration:" 2372 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2373 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2374 pr_reg->pr_reg_nacl->initiatorname, 2375 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2376 2377 if (!aptpl) { 2378 pr_tmpl->pr_aptpl_active = 0; 2379 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2380 core_scsi3_put_pr_reg(pr_reg); 2381 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2382 " for REGISTER\n"); 2383 return 0; 2384 } 2385 2386 ret = core_scsi3_update_and_write_aptpl(dev, 2387 &pr_aptpl_buf[0], 2388 pr_tmpl->pr_aptpl_buf_len); 2389 if (!ret) { 2390 pr_tmpl->pr_aptpl_active = 1; 2391 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2392 " for REGISTER\n"); 2393 } 2394 2395 kfree(pr_aptpl_buf); 2396 core_scsi3_put_pr_reg(pr_reg); 2397 } 2398 } 2399 return 0; 2400 } 2401 2402 unsigned char *core_scsi3_pr_dump_type(int type) 2403 { 2404 switch (type) { 2405 case PR_TYPE_WRITE_EXCLUSIVE: 2406 return "Write Exclusive Access"; 2407 case PR_TYPE_EXCLUSIVE_ACCESS: 2408 return "Exclusive Access"; 2409 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2410 return "Write Exclusive Access, Registrants Only"; 2411 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2412 return "Exclusive Access, Registrants Only"; 2413 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2414 return "Write Exclusive Access, All Registrants"; 2415 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2416 return "Exclusive Access, All Registrants"; 2417 default: 2418 break; 2419 } 2420 2421 return "Unknown SPC-3 PR Type"; 2422 } 2423 2424 static int core_scsi3_pro_reserve( 2425 struct se_cmd *cmd, 2426 struct se_device *dev, 2427 int type, 2428 int scope, 2429 u64 res_key) 2430 { 2431 struct se_session *se_sess = cmd->se_sess; 2432 struct se_lun *se_lun = cmd->se_lun; 2433 struct t10_pr_registration *pr_reg, *pr_res_holder; 2434 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2435 char i_buf[PR_REG_ISID_ID_LEN]; 2436 int ret, prf_isid; 2437 2438 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2439 2440 if (!se_sess || !se_lun) { 2441 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2442 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2443 return -EINVAL; 2444 } 2445 /* 2446 * Locate the existing *pr_reg via struct se_node_acl pointers 2447 */ 2448 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2449 se_sess); 2450 if (!pr_reg) { 2451 pr_err("SPC-3 PR: Unable to locate" 2452 " PR_REGISTERED *pr_reg for RESERVE\n"); 2453 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2454 return -EINVAL; 2455 } 2456 /* 2457 * From spc4r17 Section 5.7.9: Reserving: 2458 * 2459 * An application client creates a persistent reservation by issuing 2460 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2461 * a registered I_T nexus with the following parameters: 2462 * a) RESERVATION KEY set to the value of the reservation key that is 2463 * registered with the logical unit for the I_T nexus; and 2464 */ 2465 if (res_key != pr_reg->pr_res_key) { 2466 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2467 " does not match existing SA REGISTER res_key:" 2468 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2469 core_scsi3_put_pr_reg(pr_reg); 2470 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2471 return -EINVAL; 2472 } 2473 /* 2474 * From spc4r17 Section 5.7.9: Reserving: 2475 * 2476 * From above: 2477 * b) TYPE field and SCOPE field set to the persistent reservation 2478 * being created. 2479 * 2480 * Only one persistent reservation is allowed at a time per logical unit 2481 * and that persistent reservation has a scope of LU_SCOPE. 2482 */ 2483 if (scope != PR_SCOPE_LU_SCOPE) { 2484 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2485 core_scsi3_put_pr_reg(pr_reg); 2486 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2487 return -EINVAL; 2488 } 2489 /* 2490 * See if we have an existing PR reservation holder pointer at 2491 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2492 * *pr_res_holder. 2493 */ 2494 spin_lock(&dev->dev_reservation_lock); 2495 pr_res_holder = dev->dev_pr_res_holder; 2496 if ((pr_res_holder)) { 2497 /* 2498 * From spc4r17 Section 5.7.9: Reserving: 2499 * 2500 * If the device server receives a PERSISTENT RESERVE OUT 2501 * command from an I_T nexus other than a persistent reservation 2502 * holder (see 5.7.10) that attempts to create a persistent 2503 * reservation when a persistent reservation already exists for 2504 * the logical unit, then the command shall be completed with 2505 * RESERVATION CONFLICT status. 2506 */ 2507 if (pr_res_holder != pr_reg) { 2508 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2509 pr_err("SPC-3 PR: Attempted RESERVE from" 2510 " [%s]: %s while reservation already held by" 2511 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2512 cmd->se_tfo->get_fabric_name(), 2513 se_sess->se_node_acl->initiatorname, 2514 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2515 pr_res_holder->pr_reg_nacl->initiatorname); 2516 2517 spin_unlock(&dev->dev_reservation_lock); 2518 core_scsi3_put_pr_reg(pr_reg); 2519 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2520 return -EINVAL; 2521 } 2522 /* 2523 * From spc4r17 Section 5.7.9: Reserving: 2524 * 2525 * If a persistent reservation holder attempts to modify the 2526 * type or scope of an existing persistent reservation, the 2527 * command shall be completed with RESERVATION CONFLICT status. 2528 */ 2529 if ((pr_res_holder->pr_res_type != type) || 2530 (pr_res_holder->pr_res_scope != scope)) { 2531 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2532 pr_err("SPC-3 PR: Attempted RESERVE from" 2533 " [%s]: %s trying to change TYPE and/or SCOPE," 2534 " while reservation already held by [%s]: %s," 2535 " returning RESERVATION_CONFLICT\n", 2536 cmd->se_tfo->get_fabric_name(), 2537 se_sess->se_node_acl->initiatorname, 2538 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2539 pr_res_holder->pr_reg_nacl->initiatorname); 2540 2541 spin_unlock(&dev->dev_reservation_lock); 2542 core_scsi3_put_pr_reg(pr_reg); 2543 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2544 return -EINVAL; 2545 } 2546 /* 2547 * From spc4r17 Section 5.7.9: Reserving: 2548 * 2549 * If the device server receives a PERSISTENT RESERVE OUT 2550 * command with RESERVE service action where the TYPE field and 2551 * the SCOPE field contain the same values as the existing type 2552 * and scope from a persistent reservation holder, it shall not 2553 * make any change to the existing persistent reservation and 2554 * shall completethe command with GOOD status. 2555 */ 2556 spin_unlock(&dev->dev_reservation_lock); 2557 core_scsi3_put_pr_reg(pr_reg); 2558 return 0; 2559 } 2560 /* 2561 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2562 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2563 */ 2564 pr_reg->pr_res_scope = scope; 2565 pr_reg->pr_res_type = type; 2566 pr_reg->pr_res_holder = 1; 2567 dev->dev_pr_res_holder = pr_reg; 2568 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2569 PR_REG_ISID_ID_LEN); 2570 2571 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2572 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2573 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2574 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2575 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2576 cmd->se_tfo->get_fabric_name(), 2577 se_sess->se_node_acl->initiatorname, 2578 (prf_isid) ? &i_buf[0] : ""); 2579 spin_unlock(&dev->dev_reservation_lock); 2580 2581 if (pr_tmpl->pr_aptpl_active) { 2582 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2583 &pr_reg->pr_aptpl_buf[0], 2584 pr_tmpl->pr_aptpl_buf_len); 2585 if (!ret) 2586 pr_debug("SPC-3 PR: Updated APTPL metadata" 2587 " for RESERVE\n"); 2588 } 2589 2590 core_scsi3_put_pr_reg(pr_reg); 2591 return 0; 2592 } 2593 2594 static int core_scsi3_emulate_pro_reserve( 2595 struct se_cmd *cmd, 2596 int type, 2597 int scope, 2598 u64 res_key) 2599 { 2600 struct se_device *dev = cmd->se_dev; 2601 int ret = 0; 2602 2603 switch (type) { 2604 case PR_TYPE_WRITE_EXCLUSIVE: 2605 case PR_TYPE_EXCLUSIVE_ACCESS: 2606 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2607 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2608 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2609 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2610 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2611 break; 2612 default: 2613 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2614 " 0x%02x\n", type); 2615 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2616 return -EINVAL; 2617 } 2618 2619 return ret; 2620 } 2621 2622 /* 2623 * Called with struct se_device->dev_reservation_lock held. 2624 */ 2625 static void __core_scsi3_complete_pro_release( 2626 struct se_device *dev, 2627 struct se_node_acl *se_nacl, 2628 struct t10_pr_registration *pr_reg, 2629 int explict) 2630 { 2631 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2632 char i_buf[PR_REG_ISID_ID_LEN]; 2633 int prf_isid; 2634 2635 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2636 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2637 PR_REG_ISID_ID_LEN); 2638 /* 2639 * Go ahead and release the current PR reservation holder. 2640 */ 2641 dev->dev_pr_res_holder = NULL; 2642 2643 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2644 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2645 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2646 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2647 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2648 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2649 tfo->get_fabric_name(), se_nacl->initiatorname, 2650 (prf_isid) ? &i_buf[0] : ""); 2651 /* 2652 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2653 */ 2654 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2655 } 2656 2657 static int core_scsi3_emulate_pro_release( 2658 struct se_cmd *cmd, 2659 int type, 2660 int scope, 2661 u64 res_key) 2662 { 2663 struct se_device *dev = cmd->se_dev; 2664 struct se_session *se_sess = cmd->se_sess; 2665 struct se_lun *se_lun = cmd->se_lun; 2666 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2667 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2668 int ret, all_reg = 0; 2669 2670 if (!se_sess || !se_lun) { 2671 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2672 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2673 return -EINVAL; 2674 } 2675 /* 2676 * Locate the existing *pr_reg via struct se_node_acl pointers 2677 */ 2678 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2679 if (!pr_reg) { 2680 pr_err("SPC-3 PR: Unable to locate" 2681 " PR_REGISTERED *pr_reg for RELEASE\n"); 2682 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2683 return -EINVAL; 2684 } 2685 /* 2686 * From spc4r17 Section 5.7.11.2 Releasing: 2687 * 2688 * If there is no persistent reservation or in response to a persistent 2689 * reservation release request from a registered I_T nexus that is not a 2690 * persistent reservation holder (see 5.7.10), the device server shall 2691 * do the following: 2692 * 2693 * a) Not release the persistent reservation, if any; 2694 * b) Not remove any registrations; and 2695 * c) Complete the command with GOOD status. 2696 */ 2697 spin_lock(&dev->dev_reservation_lock); 2698 pr_res_holder = dev->dev_pr_res_holder; 2699 if (!pr_res_holder) { 2700 /* 2701 * No persistent reservation, return GOOD status. 2702 */ 2703 spin_unlock(&dev->dev_reservation_lock); 2704 core_scsi3_put_pr_reg(pr_reg); 2705 return 0; 2706 } 2707 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2708 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2709 all_reg = 1; 2710 2711 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2712 /* 2713 * Non 'All Registrants' PR Type cases.. 2714 * Release request from a registered I_T nexus that is not a 2715 * persistent reservation holder. return GOOD status. 2716 */ 2717 spin_unlock(&dev->dev_reservation_lock); 2718 core_scsi3_put_pr_reg(pr_reg); 2719 return 0; 2720 } 2721 /* 2722 * From spc4r17 Section 5.7.11.2 Releasing: 2723 * 2724 * Only the persistent reservation holder (see 5.7.10) is allowed to 2725 * release a persistent reservation. 2726 * 2727 * An application client releases the persistent reservation by issuing 2728 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2729 * an I_T nexus that is a persistent reservation holder with the 2730 * following parameters: 2731 * 2732 * a) RESERVATION KEY field set to the value of the reservation key 2733 * that is registered with the logical unit for the I_T nexus; 2734 */ 2735 if (res_key != pr_reg->pr_res_key) { 2736 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2737 " does not match existing SA REGISTER res_key:" 2738 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2739 spin_unlock(&dev->dev_reservation_lock); 2740 core_scsi3_put_pr_reg(pr_reg); 2741 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2742 return -EINVAL; 2743 } 2744 /* 2745 * From spc4r17 Section 5.7.11.2 Releasing and above: 2746 * 2747 * b) TYPE field and SCOPE field set to match the persistent 2748 * reservation being released. 2749 */ 2750 if ((pr_res_holder->pr_res_type != type) || 2751 (pr_res_holder->pr_res_scope != scope)) { 2752 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2753 pr_err("SPC-3 PR RELEASE: Attempted to release" 2754 " reservation from [%s]: %s with different TYPE " 2755 "and/or SCOPE while reservation already held by" 2756 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2757 cmd->se_tfo->get_fabric_name(), 2758 se_sess->se_node_acl->initiatorname, 2759 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2760 pr_res_holder->pr_reg_nacl->initiatorname); 2761 2762 spin_unlock(&dev->dev_reservation_lock); 2763 core_scsi3_put_pr_reg(pr_reg); 2764 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2765 return -EINVAL; 2766 } 2767 /* 2768 * In response to a persistent reservation release request from the 2769 * persistent reservation holder the device server shall perform a 2770 * release by doing the following as an uninterrupted series of actions: 2771 * a) Release the persistent reservation; 2772 * b) Not remove any registration(s); 2773 * c) If the released persistent reservation is a registrants only type 2774 * or all registrants type persistent reservation, 2775 * the device server shall establish a unit attention condition for 2776 * the initiator port associated with every regis- 2777 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2778 * RESERVE OUT command with RELEASE service action was received, 2779 * with the additional sense code set to RESERVATIONS RELEASED; and 2780 * d) If the persistent reservation is of any other type, the device 2781 * server shall not establish a unit attention condition. 2782 */ 2783 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2784 pr_reg, 1); 2785 2786 spin_unlock(&dev->dev_reservation_lock); 2787 2788 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2789 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2790 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2791 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2792 /* 2793 * If no UNIT ATTENTION conditions will be established for 2794 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2795 * go ahead and check for APTPL=1 update+write below 2796 */ 2797 goto write_aptpl; 2798 } 2799 2800 spin_lock(&pr_tmpl->registration_lock); 2801 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2802 pr_reg_list) { 2803 /* 2804 * Do not establish a UNIT ATTENTION condition 2805 * for the calling I_T Nexus 2806 */ 2807 if (pr_reg_p == pr_reg) 2808 continue; 2809 2810 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2811 pr_reg_p->pr_res_mapped_lun, 2812 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2813 } 2814 spin_unlock(&pr_tmpl->registration_lock); 2815 2816 write_aptpl: 2817 if (pr_tmpl->pr_aptpl_active) { 2818 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2819 &pr_reg->pr_aptpl_buf[0], 2820 pr_tmpl->pr_aptpl_buf_len); 2821 if (!ret) 2822 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2823 } 2824 2825 core_scsi3_put_pr_reg(pr_reg); 2826 return 0; 2827 } 2828 2829 static int core_scsi3_emulate_pro_clear( 2830 struct se_cmd *cmd, 2831 u64 res_key) 2832 { 2833 struct se_device *dev = cmd->se_dev; 2834 struct se_node_acl *pr_reg_nacl; 2835 struct se_session *se_sess = cmd->se_sess; 2836 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2837 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2838 u32 pr_res_mapped_lun = 0; 2839 int calling_it_nexus = 0; 2840 /* 2841 * Locate the existing *pr_reg via struct se_node_acl pointers 2842 */ 2843 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2844 se_sess->se_node_acl, se_sess); 2845 if (!pr_reg_n) { 2846 pr_err("SPC-3 PR: Unable to locate" 2847 " PR_REGISTERED *pr_reg for CLEAR\n"); 2848 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2849 return -EINVAL; 2850 } 2851 /* 2852 * From spc4r17 section 5.7.11.6, Clearing: 2853 * 2854 * Any application client may release the persistent reservation and 2855 * remove all registrations from a device server by issuing a 2856 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2857 * registered I_T nexus with the following parameter: 2858 * 2859 * a) RESERVATION KEY field set to the value of the reservation key 2860 * that is registered with the logical unit for the I_T nexus. 2861 */ 2862 if (res_key != pr_reg_n->pr_res_key) { 2863 pr_err("SPC-3 PR REGISTER: Received" 2864 " res_key: 0x%016Lx does not match" 2865 " existing SA REGISTER res_key:" 2866 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2867 core_scsi3_put_pr_reg(pr_reg_n); 2868 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2869 return -EINVAL; 2870 } 2871 /* 2872 * a) Release the persistent reservation, if any; 2873 */ 2874 spin_lock(&dev->dev_reservation_lock); 2875 pr_res_holder = dev->dev_pr_res_holder; 2876 if (pr_res_holder) { 2877 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2878 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2879 pr_res_holder, 0); 2880 } 2881 spin_unlock(&dev->dev_reservation_lock); 2882 /* 2883 * b) Remove all registration(s) (see spc4r17 5.7.7); 2884 */ 2885 spin_lock(&pr_tmpl->registration_lock); 2886 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2887 &pr_tmpl->registration_list, pr_reg_list) { 2888 2889 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2890 pr_reg_nacl = pr_reg->pr_reg_nacl; 2891 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2892 __core_scsi3_free_registration(dev, pr_reg, NULL, 2893 calling_it_nexus); 2894 /* 2895 * e) Establish a unit attention condition for the initiator 2896 * port associated with every registered I_T nexus other 2897 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2898 * command with CLEAR service action was received, with the 2899 * additional sense code set to RESERVATIONS PREEMPTED. 2900 */ 2901 if (!calling_it_nexus) 2902 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2903 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2904 } 2905 spin_unlock(&pr_tmpl->registration_lock); 2906 2907 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2908 cmd->se_tfo->get_fabric_name()); 2909 2910 if (pr_tmpl->pr_aptpl_active) { 2911 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2912 pr_debug("SPC-3 PR: Updated APTPL metadata" 2913 " for CLEAR\n"); 2914 } 2915 2916 core_scsi3_pr_generation(dev); 2917 return 0; 2918 } 2919 2920 /* 2921 * Called with struct se_device->dev_reservation_lock held. 2922 */ 2923 static void __core_scsi3_complete_pro_preempt( 2924 struct se_device *dev, 2925 struct t10_pr_registration *pr_reg, 2926 struct list_head *preempt_and_abort_list, 2927 int type, 2928 int scope, 2929 int abort) 2930 { 2931 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2932 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2933 char i_buf[PR_REG_ISID_ID_LEN]; 2934 int prf_isid; 2935 2936 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2937 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2938 PR_REG_ISID_ID_LEN); 2939 /* 2940 * Do an implict RELEASE of the existing reservation. 2941 */ 2942 if (dev->dev_pr_res_holder) 2943 __core_scsi3_complete_pro_release(dev, nacl, 2944 dev->dev_pr_res_holder, 0); 2945 2946 dev->dev_pr_res_holder = pr_reg; 2947 pr_reg->pr_res_holder = 1; 2948 pr_reg->pr_res_type = type; 2949 pr_reg->pr_res_scope = scope; 2950 2951 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2952 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2953 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2954 core_scsi3_pr_dump_type(type), 2955 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2956 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2957 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2958 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2959 /* 2960 * For PREEMPT_AND_ABORT, add the preempting reservation's 2961 * struct t10_pr_registration to the list that will be compared 2962 * against received CDBs.. 2963 */ 2964 if (preempt_and_abort_list) 2965 list_add_tail(&pr_reg->pr_reg_abort_list, 2966 preempt_and_abort_list); 2967 } 2968 2969 static void core_scsi3_release_preempt_and_abort( 2970 struct list_head *preempt_and_abort_list, 2971 struct t10_pr_registration *pr_reg_holder) 2972 { 2973 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2974 2975 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2976 pr_reg_abort_list) { 2977 2978 list_del(&pr_reg->pr_reg_abort_list); 2979 if (pr_reg_holder == pr_reg) 2980 continue; 2981 if (pr_reg->pr_res_holder) { 2982 pr_warn("pr_reg->pr_res_holder still set\n"); 2983 continue; 2984 } 2985 2986 pr_reg->pr_reg_deve = NULL; 2987 pr_reg->pr_reg_nacl = NULL; 2988 kfree(pr_reg->pr_aptpl_buf); 2989 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2990 } 2991 } 2992 2993 static int core_scsi3_pro_preempt( 2994 struct se_cmd *cmd, 2995 int type, 2996 int scope, 2997 u64 res_key, 2998 u64 sa_res_key, 2999 int abort) 3000 { 3001 struct se_device *dev = cmd->se_dev; 3002 struct se_node_acl *pr_reg_nacl; 3003 struct se_session *se_sess = cmd->se_sess; 3004 LIST_HEAD(preempt_and_abort_list); 3005 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 3006 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3007 u32 pr_res_mapped_lun = 0; 3008 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3009 int prh_type = 0, prh_scope = 0, ret; 3010 3011 if (!se_sess) { 3012 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3013 return -EINVAL; 3014 } 3015 3016 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3017 se_sess); 3018 if (!pr_reg_n) { 3019 pr_err("SPC-3 PR: Unable to locate" 3020 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3021 (abort) ? "_AND_ABORT" : ""); 3022 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3023 return -EINVAL; 3024 } 3025 if (pr_reg_n->pr_res_key != res_key) { 3026 core_scsi3_put_pr_reg(pr_reg_n); 3027 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3028 return -EINVAL; 3029 } 3030 if (scope != PR_SCOPE_LU_SCOPE) { 3031 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3032 core_scsi3_put_pr_reg(pr_reg_n); 3033 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3034 return -EINVAL; 3035 } 3036 3037 spin_lock(&dev->dev_reservation_lock); 3038 pr_res_holder = dev->dev_pr_res_holder; 3039 if (pr_res_holder && 3040 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3041 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3042 all_reg = 1; 3043 3044 if (!all_reg && !sa_res_key) { 3045 spin_unlock(&dev->dev_reservation_lock); 3046 core_scsi3_put_pr_reg(pr_reg_n); 3047 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3048 return -EINVAL; 3049 } 3050 /* 3051 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3052 * 3053 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3054 * persistent reservation holder or there is no persistent reservation 3055 * holder (i.e., there is no persistent reservation), then the device 3056 * server shall perform a preempt by doing the following in an 3057 * uninterrupted series of actions. (See below..) 3058 */ 3059 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3060 /* 3061 * No existing or SA Reservation Key matching reservations.. 3062 * 3063 * PROUT SA PREEMPT with All Registrant type reservations are 3064 * allowed to be processed without a matching SA Reservation Key 3065 */ 3066 spin_lock(&pr_tmpl->registration_lock); 3067 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3068 &pr_tmpl->registration_list, pr_reg_list) { 3069 /* 3070 * Removing of registrations in non all registrants 3071 * type reservations without a matching SA reservation 3072 * key. 3073 * 3074 * a) Remove the registrations for all I_T nexuses 3075 * specified by the SERVICE ACTION RESERVATION KEY 3076 * field; 3077 * b) Ignore the contents of the SCOPE and TYPE fields; 3078 * c) Process tasks as defined in 5.7.1; and 3079 * d) Establish a unit attention condition for the 3080 * initiator port associated with every I_T nexus 3081 * that lost its registration other than the I_T 3082 * nexus on which the PERSISTENT RESERVE OUT command 3083 * was received, with the additional sense code set 3084 * to REGISTRATIONS PREEMPTED. 3085 */ 3086 if (!all_reg) { 3087 if (pr_reg->pr_res_key != sa_res_key) 3088 continue; 3089 3090 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3091 pr_reg_nacl = pr_reg->pr_reg_nacl; 3092 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3093 __core_scsi3_free_registration(dev, pr_reg, 3094 (abort) ? &preempt_and_abort_list : 3095 NULL, calling_it_nexus); 3096 released_regs++; 3097 } else { 3098 /* 3099 * Case for any existing all registrants type 3100 * reservation, follow logic in spc4r17 section 3101 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3102 * 3103 * For a ZERO SA Reservation key, release 3104 * all other registrations and do an implict 3105 * release of active persistent reservation. 3106 * 3107 * For a non-ZERO SA Reservation key, only 3108 * release the matching reservation key from 3109 * registrations. 3110 */ 3111 if ((sa_res_key) && 3112 (pr_reg->pr_res_key != sa_res_key)) 3113 continue; 3114 3115 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3116 if (calling_it_nexus) 3117 continue; 3118 3119 pr_reg_nacl = pr_reg->pr_reg_nacl; 3120 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3121 __core_scsi3_free_registration(dev, pr_reg, 3122 (abort) ? &preempt_and_abort_list : 3123 NULL, 0); 3124 released_regs++; 3125 } 3126 if (!calling_it_nexus) 3127 core_scsi3_ua_allocate(pr_reg_nacl, 3128 pr_res_mapped_lun, 0x2A, 3129 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3130 } 3131 spin_unlock(&pr_tmpl->registration_lock); 3132 /* 3133 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3134 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3135 * RESERVATION KEY field to a value that does not match any 3136 * registered reservation key, then the device server shall 3137 * complete the command with RESERVATION CONFLICT status. 3138 */ 3139 if (!released_regs) { 3140 spin_unlock(&dev->dev_reservation_lock); 3141 core_scsi3_put_pr_reg(pr_reg_n); 3142 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3143 return -EINVAL; 3144 } 3145 /* 3146 * For an existing all registrants type reservation 3147 * with a zero SA rservation key, preempt the existing 3148 * reservation with the new PR type and scope. 3149 */ 3150 if (pr_res_holder && all_reg && !(sa_res_key)) { 3151 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3152 (abort) ? &preempt_and_abort_list : NULL, 3153 type, scope, abort); 3154 3155 if (abort) 3156 core_scsi3_release_preempt_and_abort( 3157 &preempt_and_abort_list, pr_reg_n); 3158 } 3159 spin_unlock(&dev->dev_reservation_lock); 3160 3161 if (pr_tmpl->pr_aptpl_active) { 3162 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3163 &pr_reg_n->pr_aptpl_buf[0], 3164 pr_tmpl->pr_aptpl_buf_len); 3165 if (!ret) 3166 pr_debug("SPC-3 PR: Updated APTPL" 3167 " metadata for PREEMPT%s\n", (abort) ? 3168 "_AND_ABORT" : ""); 3169 } 3170 3171 core_scsi3_put_pr_reg(pr_reg_n); 3172 core_scsi3_pr_generation(cmd->se_dev); 3173 return 0; 3174 } 3175 /* 3176 * The PREEMPTing SA reservation key matches that of the 3177 * existing persistent reservation, first, we check if 3178 * we are preempting our own reservation. 3179 * From spc4r17, section 5.7.11.4.3 Preempting 3180 * persistent reservations and registration handling 3181 * 3182 * If an all registrants persistent reservation is not 3183 * present, it is not an error for the persistent 3184 * reservation holder to preempt itself (i.e., a 3185 * PERSISTENT RESERVE OUT with a PREEMPT service action 3186 * or a PREEMPT AND ABORT service action with the 3187 * SERVICE ACTION RESERVATION KEY value equal to the 3188 * persistent reservation holder's reservation key that 3189 * is received from the persistent reservation holder). 3190 * In that case, the device server shall establish the 3191 * new persistent reservation and maintain the 3192 * registration. 3193 */ 3194 prh_type = pr_res_holder->pr_res_type; 3195 prh_scope = pr_res_holder->pr_res_scope; 3196 /* 3197 * If the SERVICE ACTION RESERVATION KEY field identifies a 3198 * persistent reservation holder (see 5.7.10), the device 3199 * server shall perform a preempt by doing the following as 3200 * an uninterrupted series of actions: 3201 * 3202 * a) Release the persistent reservation for the holder 3203 * identified by the SERVICE ACTION RESERVATION KEY field; 3204 */ 3205 if (pr_reg_n != pr_res_holder) 3206 __core_scsi3_complete_pro_release(dev, 3207 pr_res_holder->pr_reg_nacl, 3208 dev->dev_pr_res_holder, 0); 3209 /* 3210 * b) Remove the registrations for all I_T nexuses identified 3211 * by the SERVICE ACTION RESERVATION KEY field, except the 3212 * I_T nexus that is being used for the PERSISTENT RESERVE 3213 * OUT command. If an all registrants persistent reservation 3214 * is present and the SERVICE ACTION RESERVATION KEY field 3215 * is set to zero, then all registrations shall be removed 3216 * except for that of the I_T nexus that is being used for 3217 * the PERSISTENT RESERVE OUT command; 3218 */ 3219 spin_lock(&pr_tmpl->registration_lock); 3220 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3221 &pr_tmpl->registration_list, pr_reg_list) { 3222 3223 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3224 if (calling_it_nexus) 3225 continue; 3226 3227 if (pr_reg->pr_res_key != sa_res_key) 3228 continue; 3229 3230 pr_reg_nacl = pr_reg->pr_reg_nacl; 3231 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3232 __core_scsi3_free_registration(dev, pr_reg, 3233 (abort) ? &preempt_and_abort_list : NULL, 3234 calling_it_nexus); 3235 /* 3236 * e) Establish a unit attention condition for the initiator 3237 * port associated with every I_T nexus that lost its 3238 * persistent reservation and/or registration, with the 3239 * additional sense code set to REGISTRATIONS PREEMPTED; 3240 */ 3241 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3242 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3243 } 3244 spin_unlock(&pr_tmpl->registration_lock); 3245 /* 3246 * c) Establish a persistent reservation for the preempting 3247 * I_T nexus using the contents of the SCOPE and TYPE fields; 3248 */ 3249 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3250 (abort) ? &preempt_and_abort_list : NULL, 3251 type, scope, abort); 3252 /* 3253 * d) Process tasks as defined in 5.7.1; 3254 * e) See above.. 3255 * f) If the type or scope has changed, then for every I_T nexus 3256 * whose reservation key was not removed, except for the I_T 3257 * nexus on which the PERSISTENT RESERVE OUT command was 3258 * received, the device server shall establish a unit 3259 * attention condition for the initiator port associated with 3260 * that I_T nexus, with the additional sense code set to 3261 * RESERVATIONS RELEASED. If the type or scope have not 3262 * changed, then no unit attention condition(s) shall be 3263 * established for this reason. 3264 */ 3265 if ((prh_type != type) || (prh_scope != scope)) { 3266 spin_lock(&pr_tmpl->registration_lock); 3267 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3268 &pr_tmpl->registration_list, pr_reg_list) { 3269 3270 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3271 if (calling_it_nexus) 3272 continue; 3273 3274 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3275 pr_reg->pr_res_mapped_lun, 0x2A, 3276 ASCQ_2AH_RESERVATIONS_RELEASED); 3277 } 3278 spin_unlock(&pr_tmpl->registration_lock); 3279 } 3280 spin_unlock(&dev->dev_reservation_lock); 3281 /* 3282 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3283 * All received CDBs for the matching existing reservation and 3284 * registrations undergo ABORT_TASK logic. 3285 * 3286 * From there, core_scsi3_release_preempt_and_abort() will 3287 * release every registration in the list (which have already 3288 * been removed from the primary pr_reg list), except the 3289 * new persistent reservation holder, the calling Initiator Port. 3290 */ 3291 if (abort) { 3292 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3293 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3294 pr_reg_n); 3295 } 3296 3297 if (pr_tmpl->pr_aptpl_active) { 3298 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3299 &pr_reg_n->pr_aptpl_buf[0], 3300 pr_tmpl->pr_aptpl_buf_len); 3301 if (!ret) 3302 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3303 "%s\n", (abort) ? "_AND_ABORT" : ""); 3304 } 3305 3306 core_scsi3_put_pr_reg(pr_reg_n); 3307 core_scsi3_pr_generation(cmd->se_dev); 3308 return 0; 3309 } 3310 3311 static int core_scsi3_emulate_pro_preempt( 3312 struct se_cmd *cmd, 3313 int type, 3314 int scope, 3315 u64 res_key, 3316 u64 sa_res_key, 3317 int abort) 3318 { 3319 int ret = 0; 3320 3321 switch (type) { 3322 case PR_TYPE_WRITE_EXCLUSIVE: 3323 case PR_TYPE_EXCLUSIVE_ACCESS: 3324 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3325 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3326 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3327 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3328 ret = core_scsi3_pro_preempt(cmd, type, scope, 3329 res_key, sa_res_key, abort); 3330 break; 3331 default: 3332 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3333 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3334 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3335 return -EINVAL; 3336 } 3337 3338 return ret; 3339 } 3340 3341 3342 static int core_scsi3_emulate_pro_register_and_move( 3343 struct se_cmd *cmd, 3344 u64 res_key, 3345 u64 sa_res_key, 3346 int aptpl, 3347 int unreg) 3348 { 3349 struct se_session *se_sess = cmd->se_sess; 3350 struct se_device *dev = cmd->se_dev; 3351 struct se_dev_entry *dest_se_deve = NULL; 3352 struct se_lun *se_lun = cmd->se_lun; 3353 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3354 struct se_port *se_port; 3355 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3356 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3357 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3358 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3359 unsigned char *buf; 3360 unsigned char *initiator_str; 3361 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3362 u32 tid_len, tmp_tid_len; 3363 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3364 unsigned short rtpi; 3365 unsigned char proto_ident; 3366 3367 if (!se_sess || !se_lun) { 3368 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3369 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3370 return -EINVAL; 3371 } 3372 memset(dest_iport, 0, 64); 3373 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3374 se_tpg = se_sess->se_tpg; 3375 tf_ops = se_tpg->se_tpg_tfo; 3376 /* 3377 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3378 * Register behaviors for a REGISTER AND MOVE service action 3379 * 3380 * Locate the existing *pr_reg via struct se_node_acl pointers 3381 */ 3382 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3383 se_sess); 3384 if (!pr_reg) { 3385 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3386 " *pr_reg for REGISTER_AND_MOVE\n"); 3387 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3388 return -EINVAL; 3389 } 3390 /* 3391 * The provided reservation key much match the existing reservation key 3392 * provided during this initiator's I_T nexus registration. 3393 */ 3394 if (res_key != pr_reg->pr_res_key) { 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3396 " res_key: 0x%016Lx does not match existing SA REGISTER" 3397 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3398 core_scsi3_put_pr_reg(pr_reg); 3399 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3400 return -EINVAL; 3401 } 3402 /* 3403 * The service active reservation key needs to be non zero 3404 */ 3405 if (!sa_res_key) { 3406 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3407 " sa_res_key\n"); 3408 core_scsi3_put_pr_reg(pr_reg); 3409 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3410 return -EINVAL; 3411 } 3412 3413 /* 3414 * Determine the Relative Target Port Identifier where the reservation 3415 * will be moved to for the TransportID containing SCSI initiator WWN 3416 * information. 3417 */ 3418 buf = transport_kmap_data_sg(cmd); 3419 rtpi = (buf[18] & 0xff) << 8; 3420 rtpi |= buf[19] & 0xff; 3421 tid_len = (buf[20] & 0xff) << 24; 3422 tid_len |= (buf[21] & 0xff) << 16; 3423 tid_len |= (buf[22] & 0xff) << 8; 3424 tid_len |= buf[23] & 0xff; 3425 transport_kunmap_data_sg(cmd); 3426 buf = NULL; 3427 3428 if ((tid_len + 24) != cmd->data_length) { 3429 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3430 " does not equal CDB data_length: %u\n", tid_len, 3431 cmd->data_length); 3432 core_scsi3_put_pr_reg(pr_reg); 3433 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3434 return -EINVAL; 3435 } 3436 3437 spin_lock(&dev->se_port_lock); 3438 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3439 if (se_port->sep_rtpi != rtpi) 3440 continue; 3441 dest_se_tpg = se_port->sep_tpg; 3442 if (!dest_se_tpg) 3443 continue; 3444 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3445 if (!dest_tf_ops) 3446 continue; 3447 3448 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3449 smp_mb__after_atomic_inc(); 3450 spin_unlock(&dev->se_port_lock); 3451 3452 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3453 if (ret != 0) { 3454 pr_err("core_scsi3_tpg_depend_item() failed" 3455 " for dest_se_tpg\n"); 3456 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3457 smp_mb__after_atomic_dec(); 3458 core_scsi3_put_pr_reg(pr_reg); 3459 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3460 return -EINVAL; 3461 } 3462 3463 spin_lock(&dev->se_port_lock); 3464 break; 3465 } 3466 spin_unlock(&dev->se_port_lock); 3467 3468 if (!dest_se_tpg || !dest_tf_ops) { 3469 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3470 " fabric ops from Relative Target Port Identifier:" 3471 " %hu\n", rtpi); 3472 core_scsi3_put_pr_reg(pr_reg); 3473 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3474 return -EINVAL; 3475 } 3476 3477 buf = transport_kmap_data_sg(cmd); 3478 proto_ident = (buf[24] & 0x0f); 3479 #if 0 3480 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3481 " 0x%02x\n", proto_ident); 3482 #endif 3483 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3484 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3485 " proto_ident: 0x%02x does not match ident: 0x%02x" 3486 " from fabric: %s\n", proto_ident, 3487 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3488 dest_tf_ops->get_fabric_name()); 3489 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3490 ret = -EINVAL; 3491 goto out; 3492 } 3493 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3494 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3495 " containg a valid tpg_parse_pr_out_transport_id" 3496 " function pointer\n"); 3497 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3498 ret = -EINVAL; 3499 goto out; 3500 } 3501 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3502 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3503 if (!initiator_str) { 3504 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3505 " initiator_str from Transport ID\n"); 3506 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3507 ret = -EINVAL; 3508 goto out; 3509 } 3510 3511 transport_kunmap_data_sg(cmd); 3512 buf = NULL; 3513 3514 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3515 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3516 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3517 iport_ptr : ""); 3518 /* 3519 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3520 * action specifies a TransportID that is the same as the initiator port 3521 * of the I_T nexus for the command received, then the command shall 3522 * be terminated with CHECK CONDITION status, with the sense key set to 3523 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3524 * IN PARAMETER LIST. 3525 */ 3526 pr_reg_nacl = pr_reg->pr_reg_nacl; 3527 matching_iname = (!strcmp(initiator_str, 3528 pr_reg_nacl->initiatorname)) ? 1 : 0; 3529 if (!matching_iname) 3530 goto after_iport_check; 3531 3532 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3533 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3534 " matches: %s on received I_T Nexus\n", initiator_str, 3535 pr_reg_nacl->initiatorname); 3536 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3537 ret = -EINVAL; 3538 goto out; 3539 } 3540 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3541 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3542 " matches: %s %s on received I_T Nexus\n", 3543 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3544 pr_reg->pr_reg_isid); 3545 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3546 ret = -EINVAL; 3547 goto out; 3548 } 3549 after_iport_check: 3550 /* 3551 * Locate the destination struct se_node_acl from the received Transport ID 3552 */ 3553 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3554 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3555 initiator_str); 3556 if (dest_node_acl) { 3557 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3558 smp_mb__after_atomic_inc(); 3559 } 3560 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3561 3562 if (!dest_node_acl) { 3563 pr_err("Unable to locate %s dest_node_acl for" 3564 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3565 initiator_str); 3566 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3567 ret = -EINVAL; 3568 goto out; 3569 } 3570 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3571 if (ret != 0) { 3572 pr_err("core_scsi3_nodeacl_depend_item() for" 3573 " dest_node_acl\n"); 3574 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3575 smp_mb__after_atomic_dec(); 3576 dest_node_acl = NULL; 3577 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3578 ret = -EINVAL; 3579 goto out; 3580 } 3581 #if 0 3582 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3583 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3584 dest_node_acl->initiatorname); 3585 #endif 3586 /* 3587 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3588 * PORT IDENTIFIER. 3589 */ 3590 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3591 if (!dest_se_deve) { 3592 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3593 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3594 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3595 ret = -EINVAL; 3596 goto out; 3597 } 3598 3599 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3600 if (ret < 0) { 3601 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3602 atomic_dec(&dest_se_deve->pr_ref_count); 3603 smp_mb__after_atomic_dec(); 3604 dest_se_deve = NULL; 3605 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3606 ret = -EINVAL; 3607 goto out; 3608 } 3609 #if 0 3610 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3611 " ACL for dest_se_deve->mapped_lun: %u\n", 3612 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3613 dest_se_deve->mapped_lun); 3614 #endif 3615 /* 3616 * A persistent reservation needs to already existing in order to 3617 * successfully complete the REGISTER_AND_MOVE service action.. 3618 */ 3619 spin_lock(&dev->dev_reservation_lock); 3620 pr_res_holder = dev->dev_pr_res_holder; 3621 if (!pr_res_holder) { 3622 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3623 " currently held\n"); 3624 spin_unlock(&dev->dev_reservation_lock); 3625 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3626 ret = -EINVAL; 3627 goto out; 3628 } 3629 /* 3630 * The received on I_T Nexus must be the reservation holder. 3631 * 3632 * From spc4r17 section 5.7.8 Table 50 -- 3633 * Register behaviors for a REGISTER AND MOVE service action 3634 */ 3635 if (pr_res_holder != pr_reg) { 3636 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3637 " Nexus is not reservation holder\n"); 3638 spin_unlock(&dev->dev_reservation_lock); 3639 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3640 ret = -EINVAL; 3641 goto out; 3642 } 3643 /* 3644 * From spc4r17 section 5.7.8: registering and moving reservation 3645 * 3646 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3647 * action is received and the established persistent reservation is a 3648 * Write Exclusive - All Registrants type or Exclusive Access - 3649 * All Registrants type reservation, then the command shall be completed 3650 * with RESERVATION CONFLICT status. 3651 */ 3652 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3653 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3654 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3655 " reservation for type: %s\n", 3656 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3657 spin_unlock(&dev->dev_reservation_lock); 3658 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3659 ret = -EINVAL; 3660 goto out; 3661 } 3662 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3663 /* 3664 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3665 */ 3666 type = pr_res_holder->pr_res_type; 3667 scope = pr_res_holder->pr_res_type; 3668 /* 3669 * c) Associate the reservation key specified in the SERVICE ACTION 3670 * RESERVATION KEY field with the I_T nexus specified as the 3671 * destination of the register and move, where: 3672 * A) The I_T nexus is specified by the TransportID and the 3673 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3674 * B) Regardless of the TransportID format used, the association for 3675 * the initiator port is based on either the initiator port name 3676 * (see 3.1.71) on SCSI transport protocols where port names are 3677 * required or the initiator port identifier (see 3.1.70) on SCSI 3678 * transport protocols where port names are not required; 3679 * d) Register the reservation key specified in the SERVICE ACTION 3680 * RESERVATION KEY field; 3681 * e) Retain the reservation key specified in the SERVICE ACTION 3682 * RESERVATION KEY field and associated information; 3683 * 3684 * Also, It is not an error for a REGISTER AND MOVE service action to 3685 * register an I_T nexus that is already registered with the same 3686 * reservation key or a different reservation key. 3687 */ 3688 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3689 iport_ptr); 3690 if (!dest_pr_reg) { 3691 ret = core_scsi3_alloc_registration(cmd->se_dev, 3692 dest_node_acl, dest_se_deve, iport_ptr, 3693 sa_res_key, 0, aptpl, 2, 1); 3694 if (ret != 0) { 3695 spin_unlock(&dev->dev_reservation_lock); 3696 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3697 ret = -EINVAL; 3698 goto out; 3699 } 3700 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3701 iport_ptr); 3702 new_reg = 1; 3703 } 3704 /* 3705 * f) Release the persistent reservation for the persistent reservation 3706 * holder (i.e., the I_T nexus on which the 3707 */ 3708 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3709 dev->dev_pr_res_holder, 0); 3710 /* 3711 * g) Move the persistent reservation to the specified I_T nexus using 3712 * the same scope and type as the persistent reservation released in 3713 * item f); and 3714 */ 3715 dev->dev_pr_res_holder = dest_pr_reg; 3716 dest_pr_reg->pr_res_holder = 1; 3717 dest_pr_reg->pr_res_type = type; 3718 pr_reg->pr_res_scope = scope; 3719 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3720 PR_REG_ISID_ID_LEN); 3721 /* 3722 * Increment PRGeneration for existing registrations.. 3723 */ 3724 if (!new_reg) 3725 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3726 spin_unlock(&dev->dev_reservation_lock); 3727 3728 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3729 " created new reservation holder TYPE: %s on object RTPI:" 3730 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3731 core_scsi3_pr_dump_type(type), rtpi, 3732 dest_pr_reg->pr_res_generation); 3733 pr_debug("SPC-3 PR Successfully moved reservation from" 3734 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3735 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3736 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3737 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3738 iport_ptr : ""); 3739 /* 3740 * It is now safe to release configfs group dependencies for destination 3741 * of Transport ID Initiator Device/Port Identifier 3742 */ 3743 core_scsi3_lunacl_undepend_item(dest_se_deve); 3744 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3745 core_scsi3_tpg_undepend_item(dest_se_tpg); 3746 /* 3747 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3748 * nexus on which PERSISTENT RESERVE OUT command was received. 3749 */ 3750 if (unreg) { 3751 spin_lock(&pr_tmpl->registration_lock); 3752 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3753 spin_unlock(&pr_tmpl->registration_lock); 3754 } else 3755 core_scsi3_put_pr_reg(pr_reg); 3756 3757 /* 3758 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3759 * write out the updated metadata to struct file for this SCSI device. 3760 */ 3761 if (!aptpl) { 3762 pr_tmpl->pr_aptpl_active = 0; 3763 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3764 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3765 " REGISTER_AND_MOVE\n"); 3766 } else { 3767 pr_tmpl->pr_aptpl_active = 1; 3768 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3769 &dest_pr_reg->pr_aptpl_buf[0], 3770 pr_tmpl->pr_aptpl_buf_len); 3771 if (!ret) 3772 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3773 " REGISTER_AND_MOVE\n"); 3774 } 3775 3776 transport_kunmap_data_sg(cmd); 3777 3778 core_scsi3_put_pr_reg(dest_pr_reg); 3779 return 0; 3780 out: 3781 if (buf) 3782 transport_kunmap_data_sg(cmd); 3783 if (dest_se_deve) 3784 core_scsi3_lunacl_undepend_item(dest_se_deve); 3785 if (dest_node_acl) 3786 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3787 core_scsi3_tpg_undepend_item(dest_se_tpg); 3788 core_scsi3_put_pr_reg(pr_reg); 3789 return ret; 3790 } 3791 3792 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3793 { 3794 unsigned int __v1, __v2; 3795 3796 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3797 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3798 3799 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3800 } 3801 3802 /* 3803 * See spc4r17 section 6.14 Table 170 3804 */ 3805 int target_scsi3_emulate_pr_out(struct se_task *task) 3806 { 3807 struct se_cmd *cmd = task->task_se_cmd; 3808 unsigned char *cdb = &cmd->t_task_cdb[0]; 3809 unsigned char *buf; 3810 u64 res_key, sa_res_key; 3811 int sa, scope, type, aptpl; 3812 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3813 int ret; 3814 3815 /* 3816 * Following spc2r20 5.5.1 Reservations overview: 3817 * 3818 * If a logical unit has been reserved by any RESERVE command and is 3819 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3820 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3821 * initiator or service action and shall terminate with a RESERVATION 3822 * CONFLICT status. 3823 */ 3824 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3825 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3826 " SPC-2 reservation is held, returning" 3827 " RESERVATION_CONFLICT\n"); 3828 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3829 ret = EINVAL; 3830 goto out; 3831 } 3832 3833 /* 3834 * FIXME: A NULL struct se_session pointer means an this is not coming from 3835 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3836 */ 3837 if (!cmd->se_sess) { 3838 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3839 return -EINVAL; 3840 } 3841 3842 if (cmd->data_length < 24) { 3843 pr_warn("SPC-PR: Received PR OUT parameter list" 3844 " length too small: %u\n", cmd->data_length); 3845 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3846 ret = -EINVAL; 3847 goto out; 3848 } 3849 /* 3850 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3851 */ 3852 sa = (cdb[1] & 0x1f); 3853 scope = (cdb[2] & 0xf0); 3854 type = (cdb[2] & 0x0f); 3855 3856 buf = transport_kmap_data_sg(cmd); 3857 /* 3858 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3859 */ 3860 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3861 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3862 /* 3863 * REGISTER_AND_MOVE uses a different SA parameter list containing 3864 * SCSI TransportIDs. 3865 */ 3866 if (sa != PRO_REGISTER_AND_MOVE) { 3867 spec_i_pt = (buf[20] & 0x08); 3868 all_tg_pt = (buf[20] & 0x04); 3869 aptpl = (buf[20] & 0x01); 3870 } else { 3871 aptpl = (buf[17] & 0x01); 3872 unreg = (buf[17] & 0x02); 3873 } 3874 transport_kunmap_data_sg(cmd); 3875 buf = NULL; 3876 3877 /* 3878 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3879 */ 3880 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3881 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3882 ret = -EINVAL; 3883 goto out; 3884 } 3885 3886 /* 3887 * From spc4r17 section 6.14: 3888 * 3889 * If the SPEC_I_PT bit is set to zero, the service action is not 3890 * REGISTER AND MOVE, and the parameter list length is not 24, then 3891 * the command shall be terminated with CHECK CONDITION status, with 3892 * the sense key set to ILLEGAL REQUEST, and the additional sense 3893 * code set to PARAMETER LIST LENGTH ERROR. 3894 */ 3895 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3896 (cmd->data_length != 24)) { 3897 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3898 " list length: %u\n", cmd->data_length); 3899 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3900 ret = -EINVAL; 3901 goto out; 3902 } 3903 /* 3904 * (core_scsi3_emulate_pro_* function parameters 3905 * are defined by spc4r17 Table 174: 3906 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3907 */ 3908 switch (sa) { 3909 case PRO_REGISTER: 3910 ret = core_scsi3_emulate_pro_register(cmd, 3911 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3912 break; 3913 case PRO_RESERVE: 3914 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3915 break; 3916 case PRO_RELEASE: 3917 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3918 break; 3919 case PRO_CLEAR: 3920 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3921 break; 3922 case PRO_PREEMPT: 3923 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3924 res_key, sa_res_key, 0); 3925 break; 3926 case PRO_PREEMPT_AND_ABORT: 3927 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3928 res_key, sa_res_key, 1); 3929 break; 3930 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3931 ret = core_scsi3_emulate_pro_register(cmd, 3932 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3933 break; 3934 case PRO_REGISTER_AND_MOVE: 3935 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3936 sa_res_key, aptpl, unreg); 3937 break; 3938 default: 3939 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3940 " action: 0x%02x\n", cdb[1] & 0x1f); 3941 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3942 ret = -EINVAL; 3943 break; 3944 } 3945 3946 out: 3947 if (!ret) { 3948 task->task_scsi_status = GOOD; 3949 transport_complete_task(task, 1); 3950 } 3951 return ret; 3952 } 3953 3954 /* 3955 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3956 * 3957 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3958 */ 3959 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3960 { 3961 struct se_device *se_dev = cmd->se_dev; 3962 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3963 struct t10_pr_registration *pr_reg; 3964 unsigned char *buf; 3965 u32 add_len = 0, off = 8; 3966 3967 if (cmd->data_length < 8) { 3968 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3969 " too small\n", cmd->data_length); 3970 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3971 return -EINVAL; 3972 } 3973 3974 buf = transport_kmap_data_sg(cmd); 3975 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3976 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3977 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3978 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3979 3980 spin_lock(&su_dev->t10_pr.registration_lock); 3981 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3982 pr_reg_list) { 3983 /* 3984 * Check for overflow of 8byte PRI READ_KEYS payload and 3985 * next reservation key list descriptor. 3986 */ 3987 if ((add_len + 8) > (cmd->data_length - 8)) 3988 break; 3989 3990 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3991 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3992 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3993 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3994 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3995 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3996 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3997 buf[off++] = (pr_reg->pr_res_key & 0xff); 3998 3999 add_len += 8; 4000 } 4001 spin_unlock(&su_dev->t10_pr.registration_lock); 4002 4003 buf[4] = ((add_len >> 24) & 0xff); 4004 buf[5] = ((add_len >> 16) & 0xff); 4005 buf[6] = ((add_len >> 8) & 0xff); 4006 buf[7] = (add_len & 0xff); 4007 4008 transport_kunmap_data_sg(cmd); 4009 4010 return 0; 4011 } 4012 4013 /* 4014 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4015 * 4016 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4017 */ 4018 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4019 { 4020 struct se_device *se_dev = cmd->se_dev; 4021 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4022 struct t10_pr_registration *pr_reg; 4023 unsigned char *buf; 4024 u64 pr_res_key; 4025 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4026 4027 if (cmd->data_length < 8) { 4028 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4029 " too small\n", cmd->data_length); 4030 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4031 return -EINVAL; 4032 } 4033 4034 buf = transport_kmap_data_sg(cmd); 4035 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4036 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4037 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4038 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4039 4040 spin_lock(&se_dev->dev_reservation_lock); 4041 pr_reg = se_dev->dev_pr_res_holder; 4042 if ((pr_reg)) { 4043 /* 4044 * Set the hardcoded Additional Length 4045 */ 4046 buf[4] = ((add_len >> 24) & 0xff); 4047 buf[5] = ((add_len >> 16) & 0xff); 4048 buf[6] = ((add_len >> 8) & 0xff); 4049 buf[7] = (add_len & 0xff); 4050 4051 if (cmd->data_length < 22) 4052 goto err; 4053 4054 /* 4055 * Set the Reservation key. 4056 * 4057 * From spc4r17, section 5.7.10: 4058 * A persistent reservation holder has its reservation key 4059 * returned in the parameter data from a PERSISTENT 4060 * RESERVE IN command with READ RESERVATION service action as 4061 * follows: 4062 * a) For a persistent reservation of the type Write Exclusive 4063 * - All Registrants or Exclusive Access All Regitrants, 4064 * the reservation key shall be set to zero; or 4065 * b) For all other persistent reservation types, the 4066 * reservation key shall be set to the registered 4067 * reservation key for the I_T nexus that holds the 4068 * persistent reservation. 4069 */ 4070 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4071 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4072 pr_res_key = 0; 4073 else 4074 pr_res_key = pr_reg->pr_res_key; 4075 4076 buf[8] = ((pr_res_key >> 56) & 0xff); 4077 buf[9] = ((pr_res_key >> 48) & 0xff); 4078 buf[10] = ((pr_res_key >> 40) & 0xff); 4079 buf[11] = ((pr_res_key >> 32) & 0xff); 4080 buf[12] = ((pr_res_key >> 24) & 0xff); 4081 buf[13] = ((pr_res_key >> 16) & 0xff); 4082 buf[14] = ((pr_res_key >> 8) & 0xff); 4083 buf[15] = (pr_res_key & 0xff); 4084 /* 4085 * Set the SCOPE and TYPE 4086 */ 4087 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4088 (pr_reg->pr_res_type & 0x0f); 4089 } 4090 4091 err: 4092 spin_unlock(&se_dev->dev_reservation_lock); 4093 transport_kunmap_data_sg(cmd); 4094 4095 return 0; 4096 } 4097 4098 /* 4099 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4100 * 4101 * See spc4r17 section 6.13.4 Table 165 4102 */ 4103 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4104 { 4105 struct se_device *dev = cmd->se_dev; 4106 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4107 unsigned char *buf; 4108 u16 add_len = 8; /* Hardcoded to 8. */ 4109 4110 if (cmd->data_length < 6) { 4111 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4112 " %u too small\n", cmd->data_length); 4113 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4114 return -EINVAL; 4115 } 4116 4117 buf = transport_kmap_data_sg(cmd); 4118 4119 buf[0] = ((add_len << 8) & 0xff); 4120 buf[1] = (add_len & 0xff); 4121 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4122 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4123 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4124 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4125 /* 4126 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4127 * set the TMV: Task Mask Valid bit. 4128 */ 4129 buf[3] |= 0x80; 4130 /* 4131 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4132 */ 4133 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4134 /* 4135 * PTPL_A: Persistence across Target Power Loss Active bit 4136 */ 4137 if (pr_tmpl->pr_aptpl_active) 4138 buf[3] |= 0x01; 4139 /* 4140 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4141 */ 4142 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4143 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4144 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4145 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4146 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4147 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4148 4149 transport_kunmap_data_sg(cmd); 4150 4151 return 0; 4152 } 4153 4154 /* 4155 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4156 * 4157 * See spc4r17 section 6.13.5 Table 168 and 169 4158 */ 4159 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4160 { 4161 struct se_device *se_dev = cmd->se_dev; 4162 struct se_node_acl *se_nacl; 4163 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4164 struct se_portal_group *se_tpg; 4165 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4166 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4167 unsigned char *buf; 4168 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4169 u32 off = 8; /* off into first Full Status descriptor */ 4170 int format_code = 0; 4171 4172 if (cmd->data_length < 8) { 4173 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4174 " too small\n", cmd->data_length); 4175 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4176 return -EINVAL; 4177 } 4178 4179 buf = transport_kmap_data_sg(cmd); 4180 4181 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4182 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4183 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4184 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4185 4186 spin_lock(&pr_tmpl->registration_lock); 4187 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4188 &pr_tmpl->registration_list, pr_reg_list) { 4189 4190 se_nacl = pr_reg->pr_reg_nacl; 4191 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4192 add_desc_len = 0; 4193 4194 atomic_inc(&pr_reg->pr_res_holders); 4195 smp_mb__after_atomic_inc(); 4196 spin_unlock(&pr_tmpl->registration_lock); 4197 /* 4198 * Determine expected length of $FABRIC_MOD specific 4199 * TransportID full status descriptor.. 4200 */ 4201 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4202 se_tpg, se_nacl, pr_reg, &format_code); 4203 4204 if ((exp_desc_len + add_len) > cmd->data_length) { 4205 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4206 " out of buffer: %d\n", cmd->data_length); 4207 spin_lock(&pr_tmpl->registration_lock); 4208 atomic_dec(&pr_reg->pr_res_holders); 4209 smp_mb__after_atomic_dec(); 4210 break; 4211 } 4212 /* 4213 * Set RESERVATION KEY 4214 */ 4215 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4216 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4217 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4218 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4219 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4220 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4221 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4222 buf[off++] = (pr_reg->pr_res_key & 0xff); 4223 off += 4; /* Skip Over Reserved area */ 4224 4225 /* 4226 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4227 */ 4228 if (pr_reg->pr_reg_all_tg_pt) 4229 buf[off] = 0x02; 4230 /* 4231 * The struct se_lun pointer will be present for the 4232 * reservation holder for PR_HOLDER bit. 4233 * 4234 * Also, if this registration is the reservation 4235 * holder, fill in SCOPE and TYPE in the next byte. 4236 */ 4237 if (pr_reg->pr_res_holder) { 4238 buf[off++] |= 0x01; 4239 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4240 (pr_reg->pr_res_type & 0x0f); 4241 } else 4242 off += 2; 4243 4244 off += 4; /* Skip over reserved area */ 4245 /* 4246 * From spc4r17 6.3.15: 4247 * 4248 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4249 * IDENTIFIER field contains the relative port identifier (see 4250 * 3.1.120) of the target port that is part of the I_T nexus 4251 * described by this full status descriptor. If the ALL_TG_PT 4252 * bit is set to one, the contents of the RELATIVE TARGET PORT 4253 * IDENTIFIER field are not defined by this standard. 4254 */ 4255 if (!pr_reg->pr_reg_all_tg_pt) { 4256 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4257 4258 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4259 buf[off++] = (port->sep_rtpi & 0xff); 4260 } else 4261 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4262 4263 /* 4264 * Now, have the $FABRIC_MOD fill in the protocol identifier 4265 */ 4266 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4267 se_nacl, pr_reg, &format_code, &buf[off+4]); 4268 4269 spin_lock(&pr_tmpl->registration_lock); 4270 atomic_dec(&pr_reg->pr_res_holders); 4271 smp_mb__after_atomic_dec(); 4272 /* 4273 * Set the ADDITIONAL DESCRIPTOR LENGTH 4274 */ 4275 buf[off++] = ((desc_len >> 24) & 0xff); 4276 buf[off++] = ((desc_len >> 16) & 0xff); 4277 buf[off++] = ((desc_len >> 8) & 0xff); 4278 buf[off++] = (desc_len & 0xff); 4279 /* 4280 * Size of full desctipor header minus TransportID 4281 * containing $FABRIC_MOD specific) initiator device/port 4282 * WWN information. 4283 * 4284 * See spc4r17 Section 6.13.5 Table 169 4285 */ 4286 add_desc_len = (24 + desc_len); 4287 4288 off += desc_len; 4289 add_len += add_desc_len; 4290 } 4291 spin_unlock(&pr_tmpl->registration_lock); 4292 /* 4293 * Set ADDITIONAL_LENGTH 4294 */ 4295 buf[4] = ((add_len >> 24) & 0xff); 4296 buf[5] = ((add_len >> 16) & 0xff); 4297 buf[6] = ((add_len >> 8) & 0xff); 4298 buf[7] = (add_len & 0xff); 4299 4300 transport_kunmap_data_sg(cmd); 4301 4302 return 0; 4303 } 4304 4305 int target_scsi3_emulate_pr_in(struct se_task *task) 4306 { 4307 struct se_cmd *cmd = task->task_se_cmd; 4308 int ret; 4309 4310 /* 4311 * Following spc2r20 5.5.1 Reservations overview: 4312 * 4313 * If a logical unit has been reserved by any RESERVE command and is 4314 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4315 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4316 * initiator or service action and shall terminate with a RESERVATION 4317 * CONFLICT status. 4318 */ 4319 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4320 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4321 " SPC-2 reservation is held, returning" 4322 " RESERVATION_CONFLICT\n"); 4323 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4324 return -EINVAL; 4325 } 4326 4327 switch (cmd->t_task_cdb[1] & 0x1f) { 4328 case PRI_READ_KEYS: 4329 ret = core_scsi3_pri_read_keys(cmd); 4330 break; 4331 case PRI_READ_RESERVATION: 4332 ret = core_scsi3_pri_read_reservation(cmd); 4333 break; 4334 case PRI_REPORT_CAPABILITIES: 4335 ret = core_scsi3_pri_report_capabilities(cmd); 4336 break; 4337 case PRI_READ_FULL_STATUS: 4338 ret = core_scsi3_pri_read_full_status(cmd); 4339 break; 4340 default: 4341 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4342 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4343 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4344 ret = -EINVAL; 4345 break; 4346 } 4347 4348 if (!ret) { 4349 task->task_scsi_status = GOOD; 4350 transport_complete_task(task, 1); 4351 } 4352 return ret; 4353 } 4354 4355 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4356 { 4357 return 0; 4358 } 4359 4360 static int core_pt_seq_non_holder( 4361 struct se_cmd *cmd, 4362 unsigned char *cdb, 4363 u32 pr_reg_type) 4364 { 4365 return 0; 4366 } 4367 4368 int core_setup_reservations(struct se_device *dev, int force_pt) 4369 { 4370 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4371 struct t10_reservation *rest = &su_dev->t10_pr; 4372 /* 4373 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4374 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4375 * cause a problem because libata and some SATA RAID HBAs appear 4376 * under Linux/SCSI, but to emulate reservations themselves. 4377 */ 4378 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4379 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4380 rest->res_type = SPC_PASSTHROUGH; 4381 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4382 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4383 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4384 " emulation\n", dev->transport->name); 4385 return 0; 4386 } 4387 /* 4388 * If SPC-3 or above is reported by real or emulated struct se_device, 4389 * use emulated Persistent Reservations. 4390 */ 4391 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4392 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4393 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4394 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4395 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4396 " emulation\n", dev->transport->name); 4397 } else { 4398 rest->res_type = SPC2_RESERVATIONS; 4399 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4400 rest->pr_ops.t10_seq_non_holder = 4401 &core_scsi2_reservation_seq_non_holder; 4402 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4403 dev->transport->name); 4404 } 4405 4406 return 0; 4407 } 4408