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 dev->dev_reserved_node_acl = NULL; 224 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 225 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 226 dev->dev_res_bin_isid = 0; 227 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 228 } 229 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 230 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 231 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 232 sess->se_node_acl->initiatorname); 233 234 out_unlock: 235 spin_unlock(&dev->dev_reservation_lock); 236 out: 237 if (!ret) { 238 task->task_scsi_status = GOOD; 239 transport_complete_task(task, 1); 240 } 241 return ret; 242 } 243 244 int target_scsi2_reservation_reserve(struct se_task *task) 245 { 246 struct se_cmd *cmd = task->task_se_cmd; 247 struct se_device *dev = cmd->se_dev; 248 struct se_session *sess = cmd->se_sess; 249 struct se_portal_group *tpg = sess->se_tpg; 250 int ret = 0, rc; 251 252 if ((cmd->t_task_cdb[1] & 0x01) && 253 (cmd->t_task_cdb[1] & 0x02)) { 254 pr_err("LongIO and Obselete Bits set, returning" 255 " ILLEGAL_REQUEST\n"); 256 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 257 ret = -EINVAL; 258 goto out; 259 } 260 /* 261 * This is currently the case for target_core_mod passthrough struct se_cmd 262 * ops 263 */ 264 if (!sess || !tpg) 265 goto out; 266 rc = target_check_scsi2_reservation_conflict(cmd); 267 if (rc == 1) 268 goto out; 269 else if (rc < 0) { 270 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 271 ret = -EINVAL; 272 goto out; 273 } 274 275 ret = 0; 276 spin_lock(&dev->dev_reservation_lock); 277 if (dev->dev_reserved_node_acl && 278 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 279 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 280 tpg->se_tpg_tfo->get_fabric_name()); 281 pr_err("Original reserver LUN: %u %s\n", 282 cmd->se_lun->unpacked_lun, 283 dev->dev_reserved_node_acl->initiatorname); 284 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 285 " from %s \n", cmd->se_lun->unpacked_lun, 286 cmd->se_deve->mapped_lun, 287 sess->se_node_acl->initiatorname); 288 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 289 ret = -EINVAL; 290 goto out_unlock; 291 } 292 293 dev->dev_reserved_node_acl = sess->se_node_acl; 294 dev->dev_flags |= DF_SPC2_RESERVATIONS; 295 if (sess->sess_bin_isid != 0) { 296 dev->dev_res_bin_isid = sess->sess_bin_isid; 297 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 298 } 299 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 300 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 301 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 302 sess->se_node_acl->initiatorname); 303 304 out_unlock: 305 spin_unlock(&dev->dev_reservation_lock); 306 out: 307 if (!ret) { 308 task->task_scsi_status = GOOD; 309 transport_complete_task(task, 1); 310 } 311 return ret; 312 } 313 314 315 /* 316 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 317 * 318 * This function is called by those initiator ports who are *NOT* 319 * the active PR reservation holder when a reservation is present. 320 */ 321 static int core_scsi3_pr_seq_non_holder( 322 struct se_cmd *cmd, 323 unsigned char *cdb, 324 u32 pr_reg_type) 325 { 326 struct se_dev_entry *se_deve; 327 struct se_session *se_sess = cmd->se_sess; 328 int other_cdb = 0, ignore_reg; 329 int registered_nexus = 0, ret = 1; /* Conflict by default */ 330 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 331 int we = 0; /* Write Exclusive */ 332 int legacy = 0; /* Act like a legacy device and return 333 * RESERVATION CONFLICT on some CDBs */ 334 /* 335 * A legacy SPC-2 reservation is being held. 336 */ 337 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 338 return core_scsi2_reservation_seq_non_holder(cmd, 339 cdb, pr_reg_type); 340 341 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 342 /* 343 * Determine if the registration should be ignored due to 344 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 345 */ 346 ignore_reg = (pr_reg_type & 0x80000000); 347 if (ignore_reg) 348 pr_reg_type &= ~0x80000000; 349 350 switch (pr_reg_type) { 351 case PR_TYPE_WRITE_EXCLUSIVE: 352 we = 1; 353 case PR_TYPE_EXCLUSIVE_ACCESS: 354 /* 355 * Some commands are only allowed for the persistent reservation 356 * holder. 357 */ 358 if ((se_deve->def_pr_registered) && !(ignore_reg)) 359 registered_nexus = 1; 360 break; 361 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 362 we = 1; 363 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 364 /* 365 * Some commands are only allowed for registered I_T Nexuses. 366 */ 367 reg_only = 1; 368 if ((se_deve->def_pr_registered) && !(ignore_reg)) 369 registered_nexus = 1; 370 break; 371 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 372 we = 1; 373 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 374 /* 375 * Each registered I_T Nexus is a reservation holder. 376 */ 377 all_reg = 1; 378 if ((se_deve->def_pr_registered) && !(ignore_reg)) 379 registered_nexus = 1; 380 break; 381 default: 382 return -EINVAL; 383 } 384 /* 385 * Referenced from spc4r17 table 45 for *NON* PR holder access 386 */ 387 switch (cdb[0]) { 388 case SECURITY_PROTOCOL_IN: 389 if (registered_nexus) 390 return 0; 391 ret = (we) ? 0 : 1; 392 break; 393 case MODE_SENSE: 394 case MODE_SENSE_10: 395 case READ_ATTRIBUTE: 396 case READ_BUFFER: 397 case RECEIVE_DIAGNOSTIC: 398 if (legacy) { 399 ret = 1; 400 break; 401 } 402 if (registered_nexus) { 403 ret = 0; 404 break; 405 } 406 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 407 break; 408 case PERSISTENT_RESERVE_OUT: 409 /* 410 * This follows PERSISTENT_RESERVE_OUT service actions that 411 * are allowed in the presence of various reservations. 412 * See spc4r17, table 46 413 */ 414 switch (cdb[1] & 0x1f) { 415 case PRO_CLEAR: 416 case PRO_PREEMPT: 417 case PRO_PREEMPT_AND_ABORT: 418 ret = (registered_nexus) ? 0 : 1; 419 break; 420 case PRO_REGISTER: 421 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 422 ret = 0; 423 break; 424 case PRO_REGISTER_AND_MOVE: 425 case PRO_RESERVE: 426 ret = 1; 427 break; 428 case PRO_RELEASE: 429 ret = (registered_nexus) ? 0 : 1; 430 break; 431 default: 432 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 433 " action: 0x%02x\n", cdb[1] & 0x1f); 434 return -EINVAL; 435 } 436 break; 437 case RELEASE: 438 case RELEASE_10: 439 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 440 ret = 0; 441 break; 442 case RESERVE: 443 case RESERVE_10: 444 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 445 ret = 0; 446 break; 447 case TEST_UNIT_READY: 448 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 449 break; 450 case MAINTENANCE_IN: 451 switch (cdb[1] & 0x1f) { 452 case MI_MANAGEMENT_PROTOCOL_IN: 453 if (registered_nexus) { 454 ret = 0; 455 break; 456 } 457 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 458 break; 459 case MI_REPORT_SUPPORTED_OPERATION_CODES: 460 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 461 if (legacy) { 462 ret = 1; 463 break; 464 } 465 if (registered_nexus) { 466 ret = 0; 467 break; 468 } 469 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 470 break; 471 case MI_REPORT_ALIASES: 472 case MI_REPORT_IDENTIFYING_INFORMATION: 473 case MI_REPORT_PRIORITY: 474 case MI_REPORT_TARGET_PGS: 475 case MI_REPORT_TIMESTAMP: 476 ret = 0; /* Allowed */ 477 break; 478 default: 479 pr_err("Unknown MI Service Action: 0x%02x\n", 480 (cdb[1] & 0x1f)); 481 return -EINVAL; 482 } 483 break; 484 case ACCESS_CONTROL_IN: 485 case ACCESS_CONTROL_OUT: 486 case INQUIRY: 487 case LOG_SENSE: 488 case READ_MEDIA_SERIAL_NUMBER: 489 case REPORT_LUNS: 490 case REQUEST_SENSE: 491 case PERSISTENT_RESERVE_IN: 492 ret = 0; /*/ Allowed CDBs */ 493 break; 494 default: 495 other_cdb = 1; 496 break; 497 } 498 /* 499 * Case where the CDB is explicitly allowed in the above switch 500 * statement. 501 */ 502 if (!ret && !other_cdb) { 503 #if 0 504 pr_debug("Allowing explict CDB: 0x%02x for %s" 505 " reservation holder\n", cdb[0], 506 core_scsi3_pr_dump_type(pr_reg_type)); 507 #endif 508 return ret; 509 } 510 /* 511 * Check if write exclusive initiator ports *NOT* holding the 512 * WRITE_EXCLUSIVE_* reservation. 513 */ 514 if ((we) && !(registered_nexus)) { 515 if (cmd->data_direction == DMA_TO_DEVICE) { 516 /* 517 * Conflict for write exclusive 518 */ 519 pr_debug("%s Conflict for unregistered nexus" 520 " %s CDB: 0x%02x to %s reservation\n", 521 transport_dump_cmd_direction(cmd), 522 se_sess->se_node_acl->initiatorname, cdb[0], 523 core_scsi3_pr_dump_type(pr_reg_type)); 524 return 1; 525 } else { 526 /* 527 * Allow non WRITE CDBs for all Write Exclusive 528 * PR TYPEs to pass for registered and 529 * non-registered_nexuxes NOT holding the reservation. 530 * 531 * We only make noise for the unregisterd nexuses, 532 * as we expect registered non-reservation holding 533 * nexuses to issue CDBs. 534 */ 535 #if 0 536 if (!registered_nexus) { 537 pr_debug("Allowing implict CDB: 0x%02x" 538 " for %s reservation on unregistered" 539 " nexus\n", cdb[0], 540 core_scsi3_pr_dump_type(pr_reg_type)); 541 } 542 #endif 543 return 0; 544 } 545 } else if ((reg_only) || (all_reg)) { 546 if (registered_nexus) { 547 /* 548 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 549 * allow commands from registered nexuses. 550 */ 551 #if 0 552 pr_debug("Allowing implict CDB: 0x%02x for %s" 553 " reservation\n", cdb[0], 554 core_scsi3_pr_dump_type(pr_reg_type)); 555 #endif 556 return 0; 557 } 558 } 559 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 560 " for %s reservation\n", transport_dump_cmd_direction(cmd), 561 (registered_nexus) ? "" : "un", 562 se_sess->se_node_acl->initiatorname, cdb[0], 563 core_scsi3_pr_dump_type(pr_reg_type)); 564 565 return 1; /* Conflict by default */ 566 } 567 568 static u32 core_scsi3_pr_generation(struct se_device *dev) 569 { 570 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 571 u32 prg; 572 /* 573 * PRGeneration field shall contain the value of a 32-bit wrapping 574 * counter mainted by the device server. 575 * 576 * Note that this is done regardless of Active Persist across 577 * Target PowerLoss (APTPL) 578 * 579 * See spc4r17 section 6.3.12 READ_KEYS service action 580 */ 581 spin_lock(&dev->dev_reservation_lock); 582 prg = su_dev->t10_pr.pr_generation++; 583 spin_unlock(&dev->dev_reservation_lock); 584 585 return prg; 586 } 587 588 static int core_scsi3_pr_reservation_check( 589 struct se_cmd *cmd, 590 u32 *pr_reg_type) 591 { 592 struct se_device *dev = cmd->se_dev; 593 struct se_session *sess = cmd->se_sess; 594 int ret; 595 596 if (!sess) 597 return 0; 598 /* 599 * A legacy SPC-2 reservation is being held. 600 */ 601 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 602 return core_scsi2_reservation_check(cmd, pr_reg_type); 603 604 spin_lock(&dev->dev_reservation_lock); 605 if (!dev->dev_pr_res_holder) { 606 spin_unlock(&dev->dev_reservation_lock); 607 return 0; 608 } 609 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 610 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 611 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 612 spin_unlock(&dev->dev_reservation_lock); 613 return -EINVAL; 614 } 615 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 616 spin_unlock(&dev->dev_reservation_lock); 617 return 0; 618 } 619 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 620 sess->sess_bin_isid) ? 0 : -EINVAL; 621 /* 622 * Use bit in *pr_reg_type to notify ISID mismatch in 623 * core_scsi3_pr_seq_non_holder(). 624 */ 625 if (ret != 0) 626 *pr_reg_type |= 0x80000000; 627 spin_unlock(&dev->dev_reservation_lock); 628 629 return ret; 630 } 631 632 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 633 struct se_device *dev, 634 struct se_node_acl *nacl, 635 struct se_dev_entry *deve, 636 unsigned char *isid, 637 u64 sa_res_key, 638 int all_tg_pt, 639 int aptpl) 640 { 641 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 642 struct t10_pr_registration *pr_reg; 643 644 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 645 if (!pr_reg) { 646 pr_err("Unable to allocate struct t10_pr_registration\n"); 647 return NULL; 648 } 649 650 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 651 GFP_ATOMIC); 652 if (!pr_reg->pr_aptpl_buf) { 653 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 654 kmem_cache_free(t10_pr_reg_cache, pr_reg); 655 return NULL; 656 } 657 658 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 659 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 660 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 661 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 662 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 663 atomic_set(&pr_reg->pr_res_holders, 0); 664 pr_reg->pr_reg_nacl = nacl; 665 pr_reg->pr_reg_deve = deve; 666 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 667 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 668 pr_reg->pr_res_key = sa_res_key; 669 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 670 pr_reg->pr_reg_aptpl = aptpl; 671 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 672 /* 673 * If an ISID value for this SCSI Initiator Port exists, 674 * save it to the registration now. 675 */ 676 if (isid != NULL) { 677 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 678 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 679 pr_reg->isid_present_at_reg = 1; 680 } 681 682 return pr_reg; 683 } 684 685 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 686 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 687 688 /* 689 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 690 * modes. 691 */ 692 static struct t10_pr_registration *__core_scsi3_alloc_registration( 693 struct se_device *dev, 694 struct se_node_acl *nacl, 695 struct se_dev_entry *deve, 696 unsigned char *isid, 697 u64 sa_res_key, 698 int all_tg_pt, 699 int aptpl) 700 { 701 struct se_dev_entry *deve_tmp; 702 struct se_node_acl *nacl_tmp; 703 struct se_port *port, *port_tmp; 704 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 705 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 706 int ret; 707 /* 708 * Create a registration for the I_T Nexus upon which the 709 * PROUT REGISTER was received. 710 */ 711 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 712 sa_res_key, all_tg_pt, aptpl); 713 if (!pr_reg) 714 return NULL; 715 /* 716 * Return pointer to pr_reg for ALL_TG_PT=0 717 */ 718 if (!all_tg_pt) 719 return pr_reg; 720 /* 721 * Create list of matching SCSI Initiator Port registrations 722 * for ALL_TG_PT=1 723 */ 724 spin_lock(&dev->se_port_lock); 725 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 726 atomic_inc(&port->sep_tg_pt_ref_cnt); 727 smp_mb__after_atomic_inc(); 728 spin_unlock(&dev->se_port_lock); 729 730 spin_lock_bh(&port->sep_alua_lock); 731 list_for_each_entry(deve_tmp, &port->sep_alua_list, 732 alua_port_list) { 733 /* 734 * This pointer will be NULL for demo mode MappedLUNs 735 * that have not been make explict via a ConfigFS 736 * MappedLUN group for the SCSI Initiator Node ACL. 737 */ 738 if (!deve_tmp->se_lun_acl) 739 continue; 740 741 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 742 /* 743 * Skip the matching struct se_node_acl that is allocated 744 * above.. 745 */ 746 if (nacl == nacl_tmp) 747 continue; 748 /* 749 * Only perform PR registrations for target ports on 750 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 751 * arrived. 752 */ 753 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 754 continue; 755 /* 756 * Look for a matching Initiator Node ACL in ASCII format 757 */ 758 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 759 continue; 760 761 atomic_inc(&deve_tmp->pr_ref_count); 762 smp_mb__after_atomic_inc(); 763 spin_unlock_bh(&port->sep_alua_lock); 764 /* 765 * Grab a configfs group dependency that is released 766 * for the exception path at label out: below, or upon 767 * completion of adding ALL_TG_PT=1 registrations in 768 * __core_scsi3_add_registration() 769 */ 770 ret = core_scsi3_lunacl_depend_item(deve_tmp); 771 if (ret < 0) { 772 pr_err("core_scsi3_lunacl_depend" 773 "_item() failed\n"); 774 atomic_dec(&port->sep_tg_pt_ref_cnt); 775 smp_mb__after_atomic_dec(); 776 atomic_dec(&deve_tmp->pr_ref_count); 777 smp_mb__after_atomic_dec(); 778 goto out; 779 } 780 /* 781 * Located a matching SCSI Initiator Port on a different 782 * port, allocate the pr_reg_atp and attach it to the 783 * pr_reg->pr_reg_atp_list that will be processed once 784 * the original *pr_reg is processed in 785 * __core_scsi3_add_registration() 786 */ 787 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 788 nacl_tmp, deve_tmp, NULL, 789 sa_res_key, all_tg_pt, aptpl); 790 if (!pr_reg_atp) { 791 atomic_dec(&port->sep_tg_pt_ref_cnt); 792 smp_mb__after_atomic_dec(); 793 atomic_dec(&deve_tmp->pr_ref_count); 794 smp_mb__after_atomic_dec(); 795 core_scsi3_lunacl_undepend_item(deve_tmp); 796 goto out; 797 } 798 799 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 800 &pr_reg->pr_reg_atp_list); 801 spin_lock_bh(&port->sep_alua_lock); 802 } 803 spin_unlock_bh(&port->sep_alua_lock); 804 805 spin_lock(&dev->se_port_lock); 806 atomic_dec(&port->sep_tg_pt_ref_cnt); 807 smp_mb__after_atomic_dec(); 808 } 809 spin_unlock(&dev->se_port_lock); 810 811 return pr_reg; 812 out: 813 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 814 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 815 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 816 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 817 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 818 } 819 kmem_cache_free(t10_pr_reg_cache, pr_reg); 820 return NULL; 821 } 822 823 int core_scsi3_alloc_aptpl_registration( 824 struct t10_reservation *pr_tmpl, 825 u64 sa_res_key, 826 unsigned char *i_port, 827 unsigned char *isid, 828 u32 mapped_lun, 829 unsigned char *t_port, 830 u16 tpgt, 831 u32 target_lun, 832 int res_holder, 833 int all_tg_pt, 834 u8 type) 835 { 836 struct t10_pr_registration *pr_reg; 837 838 if (!i_port || !t_port || !sa_res_key) { 839 pr_err("Illegal parameters for APTPL registration\n"); 840 return -EINVAL; 841 } 842 843 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 844 if (!pr_reg) { 845 pr_err("Unable to allocate struct t10_pr_registration\n"); 846 return -ENOMEM; 847 } 848 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 849 850 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 851 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 853 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 854 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 855 atomic_set(&pr_reg->pr_res_holders, 0); 856 pr_reg->pr_reg_nacl = NULL; 857 pr_reg->pr_reg_deve = NULL; 858 pr_reg->pr_res_mapped_lun = mapped_lun; 859 pr_reg->pr_aptpl_target_lun = target_lun; 860 pr_reg->pr_res_key = sa_res_key; 861 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 862 pr_reg->pr_reg_aptpl = 1; 863 pr_reg->pr_reg_tg_pt_lun = NULL; 864 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 865 pr_reg->pr_res_type = type; 866 /* 867 * If an ISID value had been saved in APTPL metadata for this 868 * SCSI Initiator Port, restore it now. 869 */ 870 if (isid != NULL) { 871 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 872 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 873 pr_reg->isid_present_at_reg = 1; 874 } 875 /* 876 * Copy the i_port and t_port information from caller. 877 */ 878 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 879 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 880 pr_reg->pr_reg_tpgt = tpgt; 881 /* 882 * Set pr_res_holder from caller, the pr_reg who is the reservation 883 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 884 * the Initiator Node LUN ACL from the fabric module is created for 885 * this registration. 886 */ 887 pr_reg->pr_res_holder = res_holder; 888 889 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 890 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 891 " metadata\n", (res_holder) ? "+reservation" : ""); 892 return 0; 893 } 894 895 static void core_scsi3_aptpl_reserve( 896 struct se_device *dev, 897 struct se_portal_group *tpg, 898 struct se_node_acl *node_acl, 899 struct t10_pr_registration *pr_reg) 900 { 901 char i_buf[PR_REG_ISID_ID_LEN]; 902 int prf_isid; 903 904 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 905 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 906 PR_REG_ISID_ID_LEN); 907 908 spin_lock(&dev->dev_reservation_lock); 909 dev->dev_pr_res_holder = pr_reg; 910 spin_unlock(&dev->dev_reservation_lock); 911 912 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 913 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 914 tpg->se_tpg_tfo->get_fabric_name(), 915 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 916 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 917 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 918 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 919 (prf_isid) ? &i_buf[0] : ""); 920 } 921 922 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 923 struct t10_pr_registration *, int, int); 924 925 static int __core_scsi3_check_aptpl_registration( 926 struct se_device *dev, 927 struct se_portal_group *tpg, 928 struct se_lun *lun, 929 u32 target_lun, 930 struct se_node_acl *nacl, 931 struct se_dev_entry *deve) 932 { 933 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 934 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 935 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 936 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 937 u16 tpgt; 938 939 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 940 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 941 /* 942 * Copy Initiator Port information from struct se_node_acl 943 */ 944 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 945 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 946 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 947 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 948 /* 949 * Look for the matching registrations+reservation from those 950 * created from APTPL metadata. Note that multiple registrations 951 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 952 * TransportIDs. 953 */ 954 spin_lock(&pr_tmpl->aptpl_reg_lock); 955 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 956 pr_reg_aptpl_list) { 957 if (!strcmp(pr_reg->pr_iport, i_port) && 958 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 959 !(strcmp(pr_reg->pr_tport, t_port)) && 960 (pr_reg->pr_reg_tpgt == tpgt) && 961 (pr_reg->pr_aptpl_target_lun == target_lun)) { 962 963 pr_reg->pr_reg_nacl = nacl; 964 pr_reg->pr_reg_deve = deve; 965 pr_reg->pr_reg_tg_pt_lun = lun; 966 967 list_del(&pr_reg->pr_reg_aptpl_list); 968 spin_unlock(&pr_tmpl->aptpl_reg_lock); 969 /* 970 * At this point all of the pointers in *pr_reg will 971 * be setup, so go ahead and add the registration. 972 */ 973 974 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 975 /* 976 * If this registration is the reservation holder, 977 * make that happen now.. 978 */ 979 if (pr_reg->pr_res_holder) 980 core_scsi3_aptpl_reserve(dev, tpg, 981 nacl, pr_reg); 982 /* 983 * Reenable pr_aptpl_active to accept new metadata 984 * updates once the SCSI device is active again.. 985 */ 986 spin_lock(&pr_tmpl->aptpl_reg_lock); 987 pr_tmpl->pr_aptpl_active = 1; 988 } 989 } 990 spin_unlock(&pr_tmpl->aptpl_reg_lock); 991 992 return 0; 993 } 994 995 int core_scsi3_check_aptpl_registration( 996 struct se_device *dev, 997 struct se_portal_group *tpg, 998 struct se_lun *lun, 999 struct se_lun_acl *lun_acl) 1000 { 1001 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1002 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 1003 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun]; 1004 1005 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 1006 return 0; 1007 1008 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1009 lun->unpacked_lun, nacl, deve); 1010 } 1011 1012 static void __core_scsi3_dump_registration( 1013 struct target_core_fabric_ops *tfo, 1014 struct se_device *dev, 1015 struct se_node_acl *nacl, 1016 struct t10_pr_registration *pr_reg, 1017 int register_type) 1018 { 1019 struct se_portal_group *se_tpg = nacl->se_tpg; 1020 char i_buf[PR_REG_ISID_ID_LEN]; 1021 int prf_isid; 1022 1023 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1024 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1025 PR_REG_ISID_ID_LEN); 1026 1027 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1028 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1029 "_AND_MOVE" : (register_type == 1) ? 1030 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1031 (prf_isid) ? i_buf : ""); 1032 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1033 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1034 tfo->tpg_get_tag(se_tpg)); 1035 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1036 " Port(s)\n", tfo->get_fabric_name(), 1037 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1038 dev->transport->name); 1039 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1040 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1041 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1042 pr_reg->pr_reg_aptpl); 1043 } 1044 1045 /* 1046 * this function can be called with struct se_device->dev_reservation_lock 1047 * when register_move = 1 1048 */ 1049 static void __core_scsi3_add_registration( 1050 struct se_device *dev, 1051 struct se_node_acl *nacl, 1052 struct t10_pr_registration *pr_reg, 1053 int register_type, 1054 int register_move) 1055 { 1056 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1057 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1058 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1059 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1060 1061 /* 1062 * Increment PRgeneration counter for struct se_device upon a successful 1063 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1064 * 1065 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1066 * action, the struct se_device->dev_reservation_lock will already be held, 1067 * so we do not call core_scsi3_pr_generation() which grabs the lock 1068 * for the REGISTER. 1069 */ 1070 pr_reg->pr_res_generation = (register_move) ? 1071 su_dev->t10_pr.pr_generation++ : 1072 core_scsi3_pr_generation(dev); 1073 1074 spin_lock(&pr_tmpl->registration_lock); 1075 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1076 pr_reg->pr_reg_deve->def_pr_registered = 1; 1077 1078 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1079 spin_unlock(&pr_tmpl->registration_lock); 1080 /* 1081 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1082 */ 1083 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1084 return; 1085 /* 1086 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1087 * allocated in __core_scsi3_alloc_registration() 1088 */ 1089 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1090 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1091 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1092 1093 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1094 1095 spin_lock(&pr_tmpl->registration_lock); 1096 list_add_tail(&pr_reg_tmp->pr_reg_list, 1097 &pr_tmpl->registration_list); 1098 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1099 1100 __core_scsi3_dump_registration(tfo, dev, 1101 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1102 register_type); 1103 spin_unlock(&pr_tmpl->registration_lock); 1104 /* 1105 * Drop configfs group dependency reference from 1106 * __core_scsi3_alloc_registration() 1107 */ 1108 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1109 } 1110 } 1111 1112 static int core_scsi3_alloc_registration( 1113 struct se_device *dev, 1114 struct se_node_acl *nacl, 1115 struct se_dev_entry *deve, 1116 unsigned char *isid, 1117 u64 sa_res_key, 1118 int all_tg_pt, 1119 int aptpl, 1120 int register_type, 1121 int register_move) 1122 { 1123 struct t10_pr_registration *pr_reg; 1124 1125 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1126 sa_res_key, all_tg_pt, aptpl); 1127 if (!pr_reg) 1128 return -EPERM; 1129 1130 __core_scsi3_add_registration(dev, nacl, pr_reg, 1131 register_type, register_move); 1132 return 0; 1133 } 1134 1135 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1136 struct se_device *dev, 1137 struct se_node_acl *nacl, 1138 unsigned char *isid) 1139 { 1140 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1141 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1142 struct se_portal_group *tpg; 1143 1144 spin_lock(&pr_tmpl->registration_lock); 1145 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1146 &pr_tmpl->registration_list, pr_reg_list) { 1147 /* 1148 * First look for a matching struct se_node_acl 1149 */ 1150 if (pr_reg->pr_reg_nacl != nacl) 1151 continue; 1152 1153 tpg = pr_reg->pr_reg_nacl->se_tpg; 1154 /* 1155 * If this registration does NOT contain a fabric provided 1156 * ISID, then we have found a match. 1157 */ 1158 if (!pr_reg->isid_present_at_reg) { 1159 /* 1160 * Determine if this SCSI device server requires that 1161 * SCSI Intiatior TransportID w/ ISIDs is enforced 1162 * for fabric modules (iSCSI) requiring them. 1163 */ 1164 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1165 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1166 continue; 1167 } 1168 atomic_inc(&pr_reg->pr_res_holders); 1169 smp_mb__after_atomic_inc(); 1170 spin_unlock(&pr_tmpl->registration_lock); 1171 return pr_reg; 1172 } 1173 /* 1174 * If the *pr_reg contains a fabric defined ISID for multi-value 1175 * SCSI Initiator Port TransportIDs, then we expect a valid 1176 * matching ISID to be provided by the local SCSI Initiator Port. 1177 */ 1178 if (!isid) 1179 continue; 1180 if (strcmp(isid, pr_reg->pr_reg_isid)) 1181 continue; 1182 1183 atomic_inc(&pr_reg->pr_res_holders); 1184 smp_mb__after_atomic_inc(); 1185 spin_unlock(&pr_tmpl->registration_lock); 1186 return pr_reg; 1187 } 1188 spin_unlock(&pr_tmpl->registration_lock); 1189 1190 return NULL; 1191 } 1192 1193 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1194 struct se_device *dev, 1195 struct se_node_acl *nacl, 1196 struct se_session *sess) 1197 { 1198 struct se_portal_group *tpg = nacl->se_tpg; 1199 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1200 1201 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1202 memset(&buf[0], 0, PR_REG_ISID_LEN); 1203 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1204 PR_REG_ISID_LEN); 1205 isid_ptr = &buf[0]; 1206 } 1207 1208 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1209 } 1210 1211 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1212 { 1213 atomic_dec(&pr_reg->pr_res_holders); 1214 smp_mb__after_atomic_dec(); 1215 } 1216 1217 static int core_scsi3_check_implict_release( 1218 struct se_device *dev, 1219 struct t10_pr_registration *pr_reg) 1220 { 1221 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1222 struct t10_pr_registration *pr_res_holder; 1223 int ret = 0; 1224 1225 spin_lock(&dev->dev_reservation_lock); 1226 pr_res_holder = dev->dev_pr_res_holder; 1227 if (!pr_res_holder) { 1228 spin_unlock(&dev->dev_reservation_lock); 1229 return ret; 1230 } 1231 if (pr_res_holder == pr_reg) { 1232 /* 1233 * Perform an implict RELEASE if the registration that 1234 * is being released is holding the reservation. 1235 * 1236 * From spc4r17, section 5.7.11.1: 1237 * 1238 * e) If the I_T nexus is the persistent reservation holder 1239 * and the persistent reservation is not an all registrants 1240 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1241 * service action or REGISTER AND IGNORE EXISTING KEY 1242 * service action with the SERVICE ACTION RESERVATION KEY 1243 * field set to zero (see 5.7.11.3). 1244 */ 1245 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1246 ret = 1; 1247 /* 1248 * For 'All Registrants' reservation types, all existing 1249 * registrations are still processed as reservation holders 1250 * in core_scsi3_pr_seq_non_holder() after the initial 1251 * reservation holder is implictly released here. 1252 */ 1253 } else if (pr_reg->pr_reg_all_tg_pt && 1254 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1255 pr_reg->pr_reg_nacl->initiatorname)) && 1256 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1257 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1258 " UNREGISTER while existing reservation with matching" 1259 " key 0x%016Lx is present from another SCSI Initiator" 1260 " Port\n", pr_reg->pr_res_key); 1261 ret = -EPERM; 1262 } 1263 spin_unlock(&dev->dev_reservation_lock); 1264 1265 return ret; 1266 } 1267 1268 /* 1269 * Called with struct t10_reservation->registration_lock held. 1270 */ 1271 static void __core_scsi3_free_registration( 1272 struct se_device *dev, 1273 struct t10_pr_registration *pr_reg, 1274 struct list_head *preempt_and_abort_list, 1275 int dec_holders) 1276 { 1277 struct target_core_fabric_ops *tfo = 1278 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1279 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1280 char i_buf[PR_REG_ISID_ID_LEN]; 1281 int prf_isid; 1282 1283 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1284 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1285 PR_REG_ISID_ID_LEN); 1286 1287 pr_reg->pr_reg_deve->def_pr_registered = 0; 1288 pr_reg->pr_reg_deve->pr_res_key = 0; 1289 list_del(&pr_reg->pr_reg_list); 1290 /* 1291 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1292 * so call core_scsi3_put_pr_reg() to decrement our reference. 1293 */ 1294 if (dec_holders) 1295 core_scsi3_put_pr_reg(pr_reg); 1296 /* 1297 * Wait until all reference from any other I_T nexuses for this 1298 * *pr_reg have been released. Because list_del() is called above, 1299 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1300 * count back to zero, and we release *pr_reg. 1301 */ 1302 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1303 spin_unlock(&pr_tmpl->registration_lock); 1304 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1305 tfo->get_fabric_name()); 1306 cpu_relax(); 1307 spin_lock(&pr_tmpl->registration_lock); 1308 } 1309 1310 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1311 " Node: %s%s\n", tfo->get_fabric_name(), 1312 pr_reg->pr_reg_nacl->initiatorname, 1313 (prf_isid) ? &i_buf[0] : ""); 1314 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1315 " Port(s)\n", tfo->get_fabric_name(), 1316 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1317 dev->transport->name); 1318 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1319 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1320 pr_reg->pr_res_generation); 1321 1322 if (!preempt_and_abort_list) { 1323 pr_reg->pr_reg_deve = NULL; 1324 pr_reg->pr_reg_nacl = NULL; 1325 kfree(pr_reg->pr_aptpl_buf); 1326 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1327 return; 1328 } 1329 /* 1330 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1331 * are released once the ABORT_TASK_SET has completed.. 1332 */ 1333 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1334 } 1335 1336 void core_scsi3_free_pr_reg_from_nacl( 1337 struct se_device *dev, 1338 struct se_node_acl *nacl) 1339 { 1340 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1341 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1342 /* 1343 * If the passed se_node_acl matches the reservation holder, 1344 * release the reservation. 1345 */ 1346 spin_lock(&dev->dev_reservation_lock); 1347 pr_res_holder = dev->dev_pr_res_holder; 1348 if ((pr_res_holder != NULL) && 1349 (pr_res_holder->pr_reg_nacl == nacl)) 1350 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1351 spin_unlock(&dev->dev_reservation_lock); 1352 /* 1353 * Release any registration associated with the struct se_node_acl. 1354 */ 1355 spin_lock(&pr_tmpl->registration_lock); 1356 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1357 &pr_tmpl->registration_list, pr_reg_list) { 1358 1359 if (pr_reg->pr_reg_nacl != nacl) 1360 continue; 1361 1362 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1363 } 1364 spin_unlock(&pr_tmpl->registration_lock); 1365 } 1366 1367 void core_scsi3_free_all_registrations( 1368 struct se_device *dev) 1369 { 1370 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1371 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1372 1373 spin_lock(&dev->dev_reservation_lock); 1374 pr_res_holder = dev->dev_pr_res_holder; 1375 if (pr_res_holder != NULL) { 1376 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1377 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1378 pr_res_holder, 0); 1379 } 1380 spin_unlock(&dev->dev_reservation_lock); 1381 1382 spin_lock(&pr_tmpl->registration_lock); 1383 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1384 &pr_tmpl->registration_list, pr_reg_list) { 1385 1386 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1387 } 1388 spin_unlock(&pr_tmpl->registration_lock); 1389 1390 spin_lock(&pr_tmpl->aptpl_reg_lock); 1391 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1392 pr_reg_aptpl_list) { 1393 list_del(&pr_reg->pr_reg_aptpl_list); 1394 kfree(pr_reg->pr_aptpl_buf); 1395 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1396 } 1397 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1398 } 1399 1400 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1401 { 1402 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1403 &tpg->tpg_group.cg_item); 1404 } 1405 1406 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1407 { 1408 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1409 &tpg->tpg_group.cg_item); 1410 1411 atomic_dec(&tpg->tpg_pr_ref_count); 1412 smp_mb__after_atomic_dec(); 1413 } 1414 1415 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1416 { 1417 struct se_portal_group *tpg = nacl->se_tpg; 1418 1419 if (nacl->dynamic_node_acl) 1420 return 0; 1421 1422 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1423 &nacl->acl_group.cg_item); 1424 } 1425 1426 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1427 { 1428 struct se_portal_group *tpg = nacl->se_tpg; 1429 1430 if (nacl->dynamic_node_acl) { 1431 atomic_dec(&nacl->acl_pr_ref_count); 1432 smp_mb__after_atomic_dec(); 1433 return; 1434 } 1435 1436 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1437 &nacl->acl_group.cg_item); 1438 1439 atomic_dec(&nacl->acl_pr_ref_count); 1440 smp_mb__after_atomic_dec(); 1441 } 1442 1443 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1444 { 1445 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1446 struct se_node_acl *nacl; 1447 struct se_portal_group *tpg; 1448 /* 1449 * For nacl->dynamic_node_acl=1 1450 */ 1451 if (!lun_acl) 1452 return 0; 1453 1454 nacl = lun_acl->se_lun_nacl; 1455 tpg = nacl->se_tpg; 1456 1457 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1458 &lun_acl->se_lun_group.cg_item); 1459 } 1460 1461 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1462 { 1463 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1464 struct se_node_acl *nacl; 1465 struct se_portal_group *tpg; 1466 /* 1467 * For nacl->dynamic_node_acl=1 1468 */ 1469 if (!lun_acl) { 1470 atomic_dec(&se_deve->pr_ref_count); 1471 smp_mb__after_atomic_dec(); 1472 return; 1473 } 1474 nacl = lun_acl->se_lun_nacl; 1475 tpg = nacl->se_tpg; 1476 1477 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1478 &lun_acl->se_lun_group.cg_item); 1479 1480 atomic_dec(&se_deve->pr_ref_count); 1481 smp_mb__after_atomic_dec(); 1482 } 1483 1484 static int core_scsi3_decode_spec_i_port( 1485 struct se_cmd *cmd, 1486 struct se_portal_group *tpg, 1487 unsigned char *l_isid, 1488 u64 sa_res_key, 1489 int all_tg_pt, 1490 int aptpl) 1491 { 1492 struct se_device *dev = cmd->se_dev; 1493 struct se_port *tmp_port; 1494 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1495 struct se_session *se_sess = cmd->se_sess; 1496 struct se_node_acl *dest_node_acl = NULL; 1497 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1498 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1499 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1500 struct list_head tid_dest_list; 1501 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1502 struct target_core_fabric_ops *tmp_tf_ops; 1503 unsigned char *buf; 1504 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1505 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1506 u32 tpdl, tid_len = 0; 1507 int ret, dest_local_nexus, prf_isid; 1508 u32 dest_rtpi = 0; 1509 1510 memset(dest_iport, 0, 64); 1511 INIT_LIST_HEAD(&tid_dest_list); 1512 1513 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1514 /* 1515 * Allocate a struct pr_transport_id_holder and setup the 1516 * local_node_acl and local_se_deve pointers and add to 1517 * struct list_head tid_dest_list for add registration 1518 * processing in the loop of tid_dest_list below. 1519 */ 1520 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1521 if (!tidh_new) { 1522 pr_err("Unable to allocate tidh_new\n"); 1523 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1524 return -EINVAL; 1525 } 1526 INIT_LIST_HEAD(&tidh_new->dest_list); 1527 tidh_new->dest_tpg = tpg; 1528 tidh_new->dest_node_acl = se_sess->se_node_acl; 1529 tidh_new->dest_se_deve = local_se_deve; 1530 1531 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1532 se_sess->se_node_acl, local_se_deve, l_isid, 1533 sa_res_key, all_tg_pt, aptpl); 1534 if (!local_pr_reg) { 1535 kfree(tidh_new); 1536 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1537 return -ENOMEM; 1538 } 1539 tidh_new->dest_pr_reg = local_pr_reg; 1540 /* 1541 * The local I_T nexus does not hold any configfs dependances, 1542 * so we set tid_h->dest_local_nexus=1 to prevent the 1543 * configfs_undepend_item() calls in the tid_dest_list loops below. 1544 */ 1545 tidh_new->dest_local_nexus = 1; 1546 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1547 1548 buf = transport_kmap_data_sg(cmd); 1549 /* 1550 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1551 * first extract TransportID Parameter Data Length, and make sure 1552 * the value matches up to the SCSI expected data transfer length. 1553 */ 1554 tpdl = (buf[24] & 0xff) << 24; 1555 tpdl |= (buf[25] & 0xff) << 16; 1556 tpdl |= (buf[26] & 0xff) << 8; 1557 tpdl |= buf[27] & 0xff; 1558 1559 if ((tpdl + 28) != cmd->data_length) { 1560 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1561 " does not equal CDB data_length: %u\n", tpdl, 1562 cmd->data_length); 1563 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1564 ret = -EINVAL; 1565 goto out; 1566 } 1567 /* 1568 * Start processing the received transport IDs using the 1569 * receiving I_T Nexus portal's fabric dependent methods to 1570 * obtain the SCSI Initiator Port/Device Identifiers. 1571 */ 1572 ptr = &buf[28]; 1573 1574 while (tpdl > 0) { 1575 proto_ident = (ptr[0] & 0x0f); 1576 dest_tpg = NULL; 1577 1578 spin_lock(&dev->se_port_lock); 1579 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1580 tmp_tpg = tmp_port->sep_tpg; 1581 if (!tmp_tpg) 1582 continue; 1583 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1584 if (!tmp_tf_ops) 1585 continue; 1586 if (!tmp_tf_ops->get_fabric_proto_ident || 1587 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1588 continue; 1589 /* 1590 * Look for the matching proto_ident provided by 1591 * the received TransportID 1592 */ 1593 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1594 if (tmp_proto_ident != proto_ident) 1595 continue; 1596 dest_rtpi = tmp_port->sep_rtpi; 1597 1598 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1599 tmp_tpg, (const char *)ptr, &tid_len, 1600 &iport_ptr); 1601 if (!i_str) 1602 continue; 1603 1604 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1605 smp_mb__after_atomic_inc(); 1606 spin_unlock(&dev->se_port_lock); 1607 1608 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1609 if (ret != 0) { 1610 pr_err(" core_scsi3_tpg_depend_item()" 1611 " for tmp_tpg\n"); 1612 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1613 smp_mb__after_atomic_dec(); 1614 cmd->scsi_sense_reason = 1615 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1616 ret = -EINVAL; 1617 goto out; 1618 } 1619 /* 1620 * Locate the desination initiator ACL to be registered 1621 * from the decoded fabric module specific TransportID 1622 * at *i_str. 1623 */ 1624 spin_lock_irq(&tmp_tpg->acl_node_lock); 1625 dest_node_acl = __core_tpg_get_initiator_node_acl( 1626 tmp_tpg, i_str); 1627 if (dest_node_acl) { 1628 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1629 smp_mb__after_atomic_inc(); 1630 } 1631 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1632 1633 if (!dest_node_acl) { 1634 core_scsi3_tpg_undepend_item(tmp_tpg); 1635 spin_lock(&dev->se_port_lock); 1636 continue; 1637 } 1638 1639 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1640 if (ret != 0) { 1641 pr_err("configfs_depend_item() failed" 1642 " for dest_node_acl->acl_group\n"); 1643 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1644 smp_mb__after_atomic_dec(); 1645 core_scsi3_tpg_undepend_item(tmp_tpg); 1646 cmd->scsi_sense_reason = 1647 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1648 ret = -EINVAL; 1649 goto out; 1650 } 1651 1652 dest_tpg = tmp_tpg; 1653 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1654 " %s Port RTPI: %hu\n", 1655 dest_tpg->se_tpg_tfo->get_fabric_name(), 1656 dest_node_acl->initiatorname, dest_rtpi); 1657 1658 spin_lock(&dev->se_port_lock); 1659 break; 1660 } 1661 spin_unlock(&dev->se_port_lock); 1662 1663 if (!dest_tpg) { 1664 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1665 " dest_tpg\n"); 1666 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1667 ret = -EINVAL; 1668 goto out; 1669 } 1670 #if 0 1671 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1672 " tid_len: %d for %s + %s\n", 1673 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1674 tpdl, tid_len, i_str, iport_ptr); 1675 #endif 1676 if (tid_len > tpdl) { 1677 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1678 " %u for Transport ID: %s\n", tid_len, ptr); 1679 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1680 core_scsi3_tpg_undepend_item(dest_tpg); 1681 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1682 ret = -EINVAL; 1683 goto out; 1684 } 1685 /* 1686 * Locate the desintation struct se_dev_entry pointer for matching 1687 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1688 * Target Port. 1689 */ 1690 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1691 dest_rtpi); 1692 if (!dest_se_deve) { 1693 pr_err("Unable to locate %s dest_se_deve" 1694 " from destination RTPI: %hu\n", 1695 dest_tpg->se_tpg_tfo->get_fabric_name(), 1696 dest_rtpi); 1697 1698 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1699 core_scsi3_tpg_undepend_item(dest_tpg); 1700 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1701 ret = -EINVAL; 1702 goto out; 1703 } 1704 1705 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1706 if (ret < 0) { 1707 pr_err("core_scsi3_lunacl_depend_item()" 1708 " failed\n"); 1709 atomic_dec(&dest_se_deve->pr_ref_count); 1710 smp_mb__after_atomic_dec(); 1711 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1712 core_scsi3_tpg_undepend_item(dest_tpg); 1713 cmd->scsi_sense_reason = 1714 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1715 ret = -EINVAL; 1716 goto out; 1717 } 1718 #if 0 1719 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1720 " dest_se_deve mapped_lun: %u\n", 1721 dest_tpg->se_tpg_tfo->get_fabric_name(), 1722 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1723 #endif 1724 /* 1725 * Skip any TransportIDs that already have a registration for 1726 * this target port. 1727 */ 1728 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1729 iport_ptr); 1730 if (pr_reg_e) { 1731 core_scsi3_put_pr_reg(pr_reg_e); 1732 core_scsi3_lunacl_undepend_item(dest_se_deve); 1733 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1734 core_scsi3_tpg_undepend_item(dest_tpg); 1735 ptr += tid_len; 1736 tpdl -= tid_len; 1737 tid_len = 0; 1738 continue; 1739 } 1740 /* 1741 * Allocate a struct pr_transport_id_holder and setup 1742 * the dest_node_acl and dest_se_deve pointers for the 1743 * loop below. 1744 */ 1745 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1746 GFP_KERNEL); 1747 if (!tidh_new) { 1748 pr_err("Unable to allocate tidh_new\n"); 1749 core_scsi3_lunacl_undepend_item(dest_se_deve); 1750 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1751 core_scsi3_tpg_undepend_item(dest_tpg); 1752 cmd->scsi_sense_reason = 1753 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1754 ret = -ENOMEM; 1755 goto out; 1756 } 1757 INIT_LIST_HEAD(&tidh_new->dest_list); 1758 tidh_new->dest_tpg = dest_tpg; 1759 tidh_new->dest_node_acl = dest_node_acl; 1760 tidh_new->dest_se_deve = dest_se_deve; 1761 1762 /* 1763 * Allocate, but do NOT add the registration for the 1764 * TransportID referenced SCSI Initiator port. This 1765 * done because of the following from spc4r17 in section 1766 * 6.14.3 wrt SPEC_I_PT: 1767 * 1768 * "If a registration fails for any initiator port (e.g., if th 1769 * logical unit does not have enough resources available to 1770 * hold the registration information), no registrations shall be 1771 * made, and the command shall be terminated with 1772 * CHECK CONDITION status." 1773 * 1774 * That means we call __core_scsi3_alloc_registration() here, 1775 * and then call __core_scsi3_add_registration() in the 1776 * 2nd loop which will never fail. 1777 */ 1778 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1779 dest_node_acl, dest_se_deve, iport_ptr, 1780 sa_res_key, all_tg_pt, aptpl); 1781 if (!dest_pr_reg) { 1782 core_scsi3_lunacl_undepend_item(dest_se_deve); 1783 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1784 core_scsi3_tpg_undepend_item(dest_tpg); 1785 kfree(tidh_new); 1786 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1787 ret = -EINVAL; 1788 goto out; 1789 } 1790 tidh_new->dest_pr_reg = dest_pr_reg; 1791 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1792 1793 ptr += tid_len; 1794 tpdl -= tid_len; 1795 tid_len = 0; 1796 1797 } 1798 1799 transport_kunmap_data_sg(cmd); 1800 1801 /* 1802 * Go ahead and create a registrations from tid_dest_list for the 1803 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1804 * and dest_se_deve. 1805 * 1806 * The SA Reservation Key from the PROUT is set for the 1807 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1808 * means that the TransportID Initiator port will be 1809 * registered on all of the target ports in the SCSI target device 1810 * ALL_TG_PT=0 means the registration will only be for the 1811 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1812 * was received. 1813 */ 1814 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1815 dest_tpg = tidh->dest_tpg; 1816 dest_node_acl = tidh->dest_node_acl; 1817 dest_se_deve = tidh->dest_se_deve; 1818 dest_pr_reg = tidh->dest_pr_reg; 1819 dest_local_nexus = tidh->dest_local_nexus; 1820 1821 list_del(&tidh->dest_list); 1822 kfree(tidh); 1823 1824 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1825 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1826 PR_REG_ISID_ID_LEN); 1827 1828 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1829 dest_pr_reg, 0, 0); 1830 1831 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1832 " registered Transport ID for Node: %s%s Mapped LUN:" 1833 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1834 dest_node_acl->initiatorname, (prf_isid) ? 1835 &i_buf[0] : "", dest_se_deve->mapped_lun); 1836 1837 if (dest_local_nexus) 1838 continue; 1839 1840 core_scsi3_lunacl_undepend_item(dest_se_deve); 1841 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1842 core_scsi3_tpg_undepend_item(dest_tpg); 1843 } 1844 1845 return 0; 1846 out: 1847 transport_kunmap_data_sg(cmd); 1848 /* 1849 * For the failure case, release everything from tid_dest_list 1850 * including *dest_pr_reg and the configfs dependances.. 1851 */ 1852 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1853 dest_tpg = tidh->dest_tpg; 1854 dest_node_acl = tidh->dest_node_acl; 1855 dest_se_deve = tidh->dest_se_deve; 1856 dest_pr_reg = tidh->dest_pr_reg; 1857 dest_local_nexus = tidh->dest_local_nexus; 1858 1859 list_del(&tidh->dest_list); 1860 kfree(tidh); 1861 /* 1862 * Release any extra ALL_TG_PT=1 registrations for 1863 * the SPEC_I_PT=1 case. 1864 */ 1865 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1866 &dest_pr_reg->pr_reg_atp_list, 1867 pr_reg_atp_mem_list) { 1868 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1869 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1870 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1871 } 1872 1873 kfree(dest_pr_reg->pr_aptpl_buf); 1874 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1875 1876 if (dest_local_nexus) 1877 continue; 1878 1879 core_scsi3_lunacl_undepend_item(dest_se_deve); 1880 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1881 core_scsi3_tpg_undepend_item(dest_tpg); 1882 } 1883 return ret; 1884 } 1885 1886 /* 1887 * Called with struct se_device->dev_reservation_lock held 1888 */ 1889 static int __core_scsi3_update_aptpl_buf( 1890 struct se_device *dev, 1891 unsigned char *buf, 1892 u32 pr_aptpl_buf_len, 1893 int clear_aptpl_metadata) 1894 { 1895 struct se_lun *lun; 1896 struct se_portal_group *tpg; 1897 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1898 struct t10_pr_registration *pr_reg; 1899 unsigned char tmp[512], isid_buf[32]; 1900 ssize_t len = 0; 1901 int reg_count = 0; 1902 1903 memset(buf, 0, pr_aptpl_buf_len); 1904 /* 1905 * Called to clear metadata once APTPL has been deactivated. 1906 */ 1907 if (clear_aptpl_metadata) { 1908 snprintf(buf, pr_aptpl_buf_len, 1909 "No Registrations or Reservations\n"); 1910 return 0; 1911 } 1912 /* 1913 * Walk the registration list.. 1914 */ 1915 spin_lock(&su_dev->t10_pr.registration_lock); 1916 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1917 pr_reg_list) { 1918 1919 tmp[0] = '\0'; 1920 isid_buf[0] = '\0'; 1921 tpg = pr_reg->pr_reg_nacl->se_tpg; 1922 lun = pr_reg->pr_reg_tg_pt_lun; 1923 /* 1924 * Write out any ISID value to APTPL metadata that was included 1925 * in the original registration. 1926 */ 1927 if (pr_reg->isid_present_at_reg) 1928 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1929 pr_reg->pr_reg_isid); 1930 /* 1931 * Include special metadata if the pr_reg matches the 1932 * reservation holder. 1933 */ 1934 if (dev->dev_pr_res_holder == pr_reg) { 1935 snprintf(tmp, 512, "PR_REG_START: %d" 1936 "\ninitiator_fabric=%s\n" 1937 "initiator_node=%s\n%s" 1938 "sa_res_key=%llu\n" 1939 "res_holder=1\nres_type=%02x\n" 1940 "res_scope=%02x\nres_all_tg_pt=%d\n" 1941 "mapped_lun=%u\n", reg_count, 1942 tpg->se_tpg_tfo->get_fabric_name(), 1943 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1944 pr_reg->pr_res_key, pr_reg->pr_res_type, 1945 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1946 pr_reg->pr_res_mapped_lun); 1947 } else { 1948 snprintf(tmp, 512, "PR_REG_START: %d\n" 1949 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1950 "sa_res_key=%llu\nres_holder=0\n" 1951 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1952 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1953 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1954 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1955 pr_reg->pr_res_mapped_lun); 1956 } 1957 1958 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1959 pr_err("Unable to update renaming" 1960 " APTPL metadata\n"); 1961 spin_unlock(&su_dev->t10_pr.registration_lock); 1962 return -EMSGSIZE; 1963 } 1964 len += sprintf(buf+len, "%s", tmp); 1965 1966 /* 1967 * Include information about the associated SCSI target port. 1968 */ 1969 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1970 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1971 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1972 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1973 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1974 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1975 1976 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1977 pr_err("Unable to update renaming" 1978 " APTPL metadata\n"); 1979 spin_unlock(&su_dev->t10_pr.registration_lock); 1980 return -EMSGSIZE; 1981 } 1982 len += sprintf(buf+len, "%s", tmp); 1983 reg_count++; 1984 } 1985 spin_unlock(&su_dev->t10_pr.registration_lock); 1986 1987 if (!reg_count) 1988 len += sprintf(buf+len, "No Registrations or Reservations"); 1989 1990 return 0; 1991 } 1992 1993 static int core_scsi3_update_aptpl_buf( 1994 struct se_device *dev, 1995 unsigned char *buf, 1996 u32 pr_aptpl_buf_len, 1997 int clear_aptpl_metadata) 1998 { 1999 int ret; 2000 2001 spin_lock(&dev->dev_reservation_lock); 2002 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2003 clear_aptpl_metadata); 2004 spin_unlock(&dev->dev_reservation_lock); 2005 2006 return ret; 2007 } 2008 2009 /* 2010 * Called with struct se_device->aptpl_file_mutex held 2011 */ 2012 static int __core_scsi3_write_aptpl_to_file( 2013 struct se_device *dev, 2014 unsigned char *buf, 2015 u32 pr_aptpl_buf_len) 2016 { 2017 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2018 struct file *file; 2019 struct iovec iov[1]; 2020 mm_segment_t old_fs; 2021 int flags = O_RDWR | O_CREAT | O_TRUNC; 2022 char path[512]; 2023 int ret; 2024 2025 memset(iov, 0, sizeof(struct iovec)); 2026 memset(path, 0, 512); 2027 2028 if (strlen(&wwn->unit_serial[0]) >= 512) { 2029 pr_err("WWN value for struct se_device does not fit" 2030 " into path buffer\n"); 2031 return -EMSGSIZE; 2032 } 2033 2034 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2035 file = filp_open(path, flags, 0600); 2036 if (IS_ERR(file) || !file || !file->f_dentry) { 2037 pr_err("filp_open(%s) for APTPL metadata" 2038 " failed\n", path); 2039 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT); 2040 } 2041 2042 iov[0].iov_base = &buf[0]; 2043 if (!pr_aptpl_buf_len) 2044 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2045 else 2046 iov[0].iov_len = pr_aptpl_buf_len; 2047 2048 old_fs = get_fs(); 2049 set_fs(get_ds()); 2050 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2051 set_fs(old_fs); 2052 2053 if (ret < 0) { 2054 pr_debug("Error writing APTPL metadata file: %s\n", path); 2055 filp_close(file, NULL); 2056 return -EIO; 2057 } 2058 filp_close(file, NULL); 2059 2060 return 0; 2061 } 2062 2063 static int core_scsi3_update_and_write_aptpl( 2064 struct se_device *dev, 2065 unsigned char *in_buf, 2066 u32 in_pr_aptpl_buf_len) 2067 { 2068 unsigned char null_buf[64], *buf; 2069 u32 pr_aptpl_buf_len; 2070 int ret, clear_aptpl_metadata = 0; 2071 /* 2072 * Can be called with a NULL pointer from PROUT service action CLEAR 2073 */ 2074 if (!in_buf) { 2075 memset(null_buf, 0, 64); 2076 buf = &null_buf[0]; 2077 /* 2078 * This will clear the APTPL metadata to: 2079 * "No Registrations or Reservations" status 2080 */ 2081 pr_aptpl_buf_len = 64; 2082 clear_aptpl_metadata = 1; 2083 } else { 2084 buf = in_buf; 2085 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2086 } 2087 2088 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2089 clear_aptpl_metadata); 2090 if (ret != 0) 2091 return ret; 2092 /* 2093 * __core_scsi3_write_aptpl_to_file() will call strlen() 2094 * on the passed buf to determine pr_aptpl_buf_len. 2095 */ 2096 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2097 if (ret != 0) 2098 return ret; 2099 2100 return ret; 2101 } 2102 2103 static int core_scsi3_emulate_pro_register( 2104 struct se_cmd *cmd, 2105 u64 res_key, 2106 u64 sa_res_key, 2107 int aptpl, 2108 int all_tg_pt, 2109 int spec_i_pt, 2110 int ignore_key) 2111 { 2112 struct se_session *se_sess = cmd->se_sess; 2113 struct se_device *dev = cmd->se_dev; 2114 struct se_dev_entry *se_deve; 2115 struct se_lun *se_lun = cmd->se_lun; 2116 struct se_portal_group *se_tpg; 2117 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2118 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2119 /* Used for APTPL metadata w/ UNREGISTER */ 2120 unsigned char *pr_aptpl_buf = NULL; 2121 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2122 int pr_holder = 0, ret = 0, type; 2123 2124 if (!se_sess || !se_lun) { 2125 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2126 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2127 return -EINVAL; 2128 } 2129 se_tpg = se_sess->se_tpg; 2130 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2131 2132 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2133 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2134 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2135 PR_REG_ISID_LEN); 2136 isid_ptr = &isid_buf[0]; 2137 } 2138 /* 2139 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2140 */ 2141 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2142 if (!pr_reg_e) { 2143 if (res_key) { 2144 pr_warn("SPC-3 PR: Reservation Key non-zero" 2145 " for SA REGISTER, returning CONFLICT\n"); 2146 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2147 return -EINVAL; 2148 } 2149 /* 2150 * Do nothing but return GOOD status. 2151 */ 2152 if (!sa_res_key) 2153 return 0; 2154 2155 if (!spec_i_pt) { 2156 /* 2157 * Perform the Service Action REGISTER on the Initiator 2158 * Port Endpoint that the PRO was received from on the 2159 * Logical Unit of the SCSI device server. 2160 */ 2161 ret = core_scsi3_alloc_registration(cmd->se_dev, 2162 se_sess->se_node_acl, se_deve, isid_ptr, 2163 sa_res_key, all_tg_pt, aptpl, 2164 ignore_key, 0); 2165 if (ret != 0) { 2166 pr_err("Unable to allocate" 2167 " struct t10_pr_registration\n"); 2168 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2169 return -EINVAL; 2170 } 2171 } else { 2172 /* 2173 * Register both the Initiator port that received 2174 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2175 * TransportID from Parameter list and loop through 2176 * fabric dependent parameter list while calling 2177 * logic from of core_scsi3_alloc_registration() for 2178 * each TransportID provided SCSI Initiator Port/Device 2179 */ 2180 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2181 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2182 if (ret != 0) 2183 return ret; 2184 } 2185 /* 2186 * Nothing left to do for the APTPL=0 case. 2187 */ 2188 if (!aptpl) { 2189 pr_tmpl->pr_aptpl_active = 0; 2190 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2191 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2192 " REGISTER\n"); 2193 return 0; 2194 } 2195 /* 2196 * Locate the newly allocated local I_T Nexus *pr_reg, and 2197 * update the APTPL metadata information using its 2198 * preallocated *pr_reg->pr_aptpl_buf. 2199 */ 2200 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2201 se_sess->se_node_acl, se_sess); 2202 2203 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2204 &pr_reg->pr_aptpl_buf[0], 2205 pr_tmpl->pr_aptpl_buf_len); 2206 if (!ret) { 2207 pr_tmpl->pr_aptpl_active = 1; 2208 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2209 } 2210 2211 core_scsi3_put_pr_reg(pr_reg); 2212 return ret; 2213 } else { 2214 /* 2215 * Locate the existing *pr_reg via struct se_node_acl pointers 2216 */ 2217 pr_reg = pr_reg_e; 2218 type = pr_reg->pr_res_type; 2219 2220 if (!ignore_key) { 2221 if (res_key != pr_reg->pr_res_key) { 2222 pr_err("SPC-3 PR REGISTER: Received" 2223 " res_key: 0x%016Lx does not match" 2224 " existing SA REGISTER res_key:" 2225 " 0x%016Lx\n", res_key, 2226 pr_reg->pr_res_key); 2227 core_scsi3_put_pr_reg(pr_reg); 2228 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2229 return -EINVAL; 2230 } 2231 } 2232 if (spec_i_pt) { 2233 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2234 " set while sa_res_key=0\n"); 2235 core_scsi3_put_pr_reg(pr_reg); 2236 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2237 return -EINVAL; 2238 } 2239 /* 2240 * An existing ALL_TG_PT=1 registration being released 2241 * must also set ALL_TG_PT=1 in the incoming PROUT. 2242 */ 2243 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2244 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2245 " registration exists, but ALL_TG_PT=1 bit not" 2246 " present in received PROUT\n"); 2247 core_scsi3_put_pr_reg(pr_reg); 2248 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2249 return -EINVAL; 2250 } 2251 /* 2252 * Allocate APTPL metadata buffer used for UNREGISTER ops 2253 */ 2254 if (aptpl) { 2255 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2256 GFP_KERNEL); 2257 if (!pr_aptpl_buf) { 2258 pr_err("Unable to allocate" 2259 " pr_aptpl_buf\n"); 2260 core_scsi3_put_pr_reg(pr_reg); 2261 cmd->scsi_sense_reason = 2262 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2263 return -EINVAL; 2264 } 2265 } 2266 /* 2267 * sa_res_key=0 Unregister Reservation Key for registered I_T 2268 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2269 * Nexus. 2270 */ 2271 if (!sa_res_key) { 2272 pr_holder = core_scsi3_check_implict_release( 2273 cmd->se_dev, pr_reg); 2274 if (pr_holder < 0) { 2275 kfree(pr_aptpl_buf); 2276 core_scsi3_put_pr_reg(pr_reg); 2277 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2278 return -EINVAL; 2279 } 2280 2281 spin_lock(&pr_tmpl->registration_lock); 2282 /* 2283 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2284 * and matching pr_res_key. 2285 */ 2286 if (pr_reg->pr_reg_all_tg_pt) { 2287 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2288 &pr_tmpl->registration_list, 2289 pr_reg_list) { 2290 2291 if (!pr_reg_p->pr_reg_all_tg_pt) 2292 continue; 2293 2294 if (pr_reg_p->pr_res_key != res_key) 2295 continue; 2296 2297 if (pr_reg == pr_reg_p) 2298 continue; 2299 2300 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2301 pr_reg_p->pr_reg_nacl->initiatorname)) 2302 continue; 2303 2304 __core_scsi3_free_registration(dev, 2305 pr_reg_p, NULL, 0); 2306 } 2307 } 2308 /* 2309 * Release the calling I_T Nexus registration now.. 2310 */ 2311 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2312 NULL, 1); 2313 /* 2314 * From spc4r17, section 5.7.11.3 Unregistering 2315 * 2316 * If the persistent reservation is a registrants only 2317 * type, the device server shall establish a unit 2318 * attention condition for the initiator port associated 2319 * with every registered I_T nexus except for the I_T 2320 * nexus on which the PERSISTENT RESERVE OUT command was 2321 * received, with the additional sense code set to 2322 * RESERVATIONS RELEASED. 2323 */ 2324 if (pr_holder && 2325 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2326 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2327 list_for_each_entry(pr_reg_p, 2328 &pr_tmpl->registration_list, 2329 pr_reg_list) { 2330 2331 core_scsi3_ua_allocate( 2332 pr_reg_p->pr_reg_nacl, 2333 pr_reg_p->pr_res_mapped_lun, 2334 0x2A, 2335 ASCQ_2AH_RESERVATIONS_RELEASED); 2336 } 2337 } 2338 spin_unlock(&pr_tmpl->registration_lock); 2339 2340 if (!aptpl) { 2341 pr_tmpl->pr_aptpl_active = 0; 2342 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2343 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2344 " for UNREGISTER\n"); 2345 return 0; 2346 } 2347 2348 ret = core_scsi3_update_and_write_aptpl(dev, 2349 &pr_aptpl_buf[0], 2350 pr_tmpl->pr_aptpl_buf_len); 2351 if (!ret) { 2352 pr_tmpl->pr_aptpl_active = 1; 2353 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2354 " for UNREGISTER\n"); 2355 } 2356 2357 kfree(pr_aptpl_buf); 2358 return ret; 2359 } else { 2360 /* 2361 * Increment PRgeneration counter for struct se_device" 2362 * upon a successful REGISTER, see spc4r17 section 6.3.2 2363 * READ_KEYS service action. 2364 */ 2365 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2366 cmd->se_dev); 2367 pr_reg->pr_res_key = sa_res_key; 2368 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2369 " Key for %s to: 0x%016Lx PRgeneration:" 2370 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2371 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2372 pr_reg->pr_reg_nacl->initiatorname, 2373 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2374 2375 if (!aptpl) { 2376 pr_tmpl->pr_aptpl_active = 0; 2377 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2378 core_scsi3_put_pr_reg(pr_reg); 2379 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2380 " for REGISTER\n"); 2381 return 0; 2382 } 2383 2384 ret = core_scsi3_update_and_write_aptpl(dev, 2385 &pr_aptpl_buf[0], 2386 pr_tmpl->pr_aptpl_buf_len); 2387 if (!ret) { 2388 pr_tmpl->pr_aptpl_active = 1; 2389 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2390 " for REGISTER\n"); 2391 } 2392 2393 kfree(pr_aptpl_buf); 2394 core_scsi3_put_pr_reg(pr_reg); 2395 } 2396 } 2397 return 0; 2398 } 2399 2400 unsigned char *core_scsi3_pr_dump_type(int type) 2401 { 2402 switch (type) { 2403 case PR_TYPE_WRITE_EXCLUSIVE: 2404 return "Write Exclusive Access"; 2405 case PR_TYPE_EXCLUSIVE_ACCESS: 2406 return "Exclusive Access"; 2407 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2408 return "Write Exclusive Access, Registrants Only"; 2409 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2410 return "Exclusive Access, Registrants Only"; 2411 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2412 return "Write Exclusive Access, All Registrants"; 2413 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2414 return "Exclusive Access, All Registrants"; 2415 default: 2416 break; 2417 } 2418 2419 return "Unknown SPC-3 PR Type"; 2420 } 2421 2422 static int core_scsi3_pro_reserve( 2423 struct se_cmd *cmd, 2424 struct se_device *dev, 2425 int type, 2426 int scope, 2427 u64 res_key) 2428 { 2429 struct se_session *se_sess = cmd->se_sess; 2430 struct se_dev_entry *se_deve; 2431 struct se_lun *se_lun = cmd->se_lun; 2432 struct se_portal_group *se_tpg; 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 se_tpg = se_sess->se_tpg; 2446 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2447 /* 2448 * Locate the existing *pr_reg via struct se_node_acl pointers 2449 */ 2450 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2451 se_sess); 2452 if (!pr_reg) { 2453 pr_err("SPC-3 PR: Unable to locate" 2454 " PR_REGISTERED *pr_reg for RESERVE\n"); 2455 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2456 return -EINVAL; 2457 } 2458 /* 2459 * From spc4r17 Section 5.7.9: Reserving: 2460 * 2461 * An application client creates a persistent reservation by issuing 2462 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2463 * a registered I_T nexus with the following parameters: 2464 * a) RESERVATION KEY set to the value of the reservation key that is 2465 * registered with the logical unit for the I_T nexus; and 2466 */ 2467 if (res_key != pr_reg->pr_res_key) { 2468 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2469 " does not match existing SA REGISTER res_key:" 2470 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2471 core_scsi3_put_pr_reg(pr_reg); 2472 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2473 return -EINVAL; 2474 } 2475 /* 2476 * From spc4r17 Section 5.7.9: Reserving: 2477 * 2478 * From above: 2479 * b) TYPE field and SCOPE field set to the persistent reservation 2480 * being created. 2481 * 2482 * Only one persistent reservation is allowed at a time per logical unit 2483 * and that persistent reservation has a scope of LU_SCOPE. 2484 */ 2485 if (scope != PR_SCOPE_LU_SCOPE) { 2486 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2487 core_scsi3_put_pr_reg(pr_reg); 2488 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2489 return -EINVAL; 2490 } 2491 /* 2492 * See if we have an existing PR reservation holder pointer at 2493 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2494 * *pr_res_holder. 2495 */ 2496 spin_lock(&dev->dev_reservation_lock); 2497 pr_res_holder = dev->dev_pr_res_holder; 2498 if ((pr_res_holder)) { 2499 /* 2500 * From spc4r17 Section 5.7.9: Reserving: 2501 * 2502 * If the device server receives a PERSISTENT RESERVE OUT 2503 * command from an I_T nexus other than a persistent reservation 2504 * holder (see 5.7.10) that attempts to create a persistent 2505 * reservation when a persistent reservation already exists for 2506 * the logical unit, then the command shall be completed with 2507 * RESERVATION CONFLICT status. 2508 */ 2509 if (pr_res_holder != pr_reg) { 2510 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2511 pr_err("SPC-3 PR: Attempted RESERVE from" 2512 " [%s]: %s while reservation already held by" 2513 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2514 cmd->se_tfo->get_fabric_name(), 2515 se_sess->se_node_acl->initiatorname, 2516 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2517 pr_res_holder->pr_reg_nacl->initiatorname); 2518 2519 spin_unlock(&dev->dev_reservation_lock); 2520 core_scsi3_put_pr_reg(pr_reg); 2521 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2522 return -EINVAL; 2523 } 2524 /* 2525 * From spc4r17 Section 5.7.9: Reserving: 2526 * 2527 * If a persistent reservation holder attempts to modify the 2528 * type or scope of an existing persistent reservation, the 2529 * command shall be completed with RESERVATION CONFLICT status. 2530 */ 2531 if ((pr_res_holder->pr_res_type != type) || 2532 (pr_res_holder->pr_res_scope != scope)) { 2533 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2534 pr_err("SPC-3 PR: Attempted RESERVE from" 2535 " [%s]: %s trying to change TYPE and/or SCOPE," 2536 " while reservation already held by [%s]: %s," 2537 " returning RESERVATION_CONFLICT\n", 2538 cmd->se_tfo->get_fabric_name(), 2539 se_sess->se_node_acl->initiatorname, 2540 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2541 pr_res_holder->pr_reg_nacl->initiatorname); 2542 2543 spin_unlock(&dev->dev_reservation_lock); 2544 core_scsi3_put_pr_reg(pr_reg); 2545 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2546 return -EINVAL; 2547 } 2548 /* 2549 * From spc4r17 Section 5.7.9: Reserving: 2550 * 2551 * If the device server receives a PERSISTENT RESERVE OUT 2552 * command with RESERVE service action where the TYPE field and 2553 * the SCOPE field contain the same values as the existing type 2554 * and scope from a persistent reservation holder, it shall not 2555 * make any change to the existing persistent reservation and 2556 * shall completethe command with GOOD status. 2557 */ 2558 spin_unlock(&dev->dev_reservation_lock); 2559 core_scsi3_put_pr_reg(pr_reg); 2560 return 0; 2561 } 2562 /* 2563 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2564 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2565 */ 2566 pr_reg->pr_res_scope = scope; 2567 pr_reg->pr_res_type = type; 2568 pr_reg->pr_res_holder = 1; 2569 dev->dev_pr_res_holder = pr_reg; 2570 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2571 PR_REG_ISID_ID_LEN); 2572 2573 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2574 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2575 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2576 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2577 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2578 cmd->se_tfo->get_fabric_name(), 2579 se_sess->se_node_acl->initiatorname, 2580 (prf_isid) ? &i_buf[0] : ""); 2581 spin_unlock(&dev->dev_reservation_lock); 2582 2583 if (pr_tmpl->pr_aptpl_active) { 2584 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2585 &pr_reg->pr_aptpl_buf[0], 2586 pr_tmpl->pr_aptpl_buf_len); 2587 if (!ret) 2588 pr_debug("SPC-3 PR: Updated APTPL metadata" 2589 " for RESERVE\n"); 2590 } 2591 2592 core_scsi3_put_pr_reg(pr_reg); 2593 return 0; 2594 } 2595 2596 static int core_scsi3_emulate_pro_reserve( 2597 struct se_cmd *cmd, 2598 int type, 2599 int scope, 2600 u64 res_key) 2601 { 2602 struct se_device *dev = cmd->se_dev; 2603 int ret = 0; 2604 2605 switch (type) { 2606 case PR_TYPE_WRITE_EXCLUSIVE: 2607 case PR_TYPE_EXCLUSIVE_ACCESS: 2608 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2609 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2610 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2611 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2612 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2613 break; 2614 default: 2615 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2616 " 0x%02x\n", type); 2617 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2618 return -EINVAL; 2619 } 2620 2621 return ret; 2622 } 2623 2624 /* 2625 * Called with struct se_device->dev_reservation_lock held. 2626 */ 2627 static void __core_scsi3_complete_pro_release( 2628 struct se_device *dev, 2629 struct se_node_acl *se_nacl, 2630 struct t10_pr_registration *pr_reg, 2631 int explict) 2632 { 2633 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2634 char i_buf[PR_REG_ISID_ID_LEN]; 2635 int prf_isid; 2636 2637 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2638 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2639 PR_REG_ISID_ID_LEN); 2640 /* 2641 * Go ahead and release the current PR reservation holder. 2642 */ 2643 dev->dev_pr_res_holder = NULL; 2644 2645 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2646 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2647 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2648 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2649 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2650 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2651 tfo->get_fabric_name(), se_nacl->initiatorname, 2652 (prf_isid) ? &i_buf[0] : ""); 2653 /* 2654 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2655 */ 2656 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2657 } 2658 2659 static int core_scsi3_emulate_pro_release( 2660 struct se_cmd *cmd, 2661 int type, 2662 int scope, 2663 u64 res_key) 2664 { 2665 struct se_device *dev = cmd->se_dev; 2666 struct se_session *se_sess = cmd->se_sess; 2667 struct se_lun *se_lun = cmd->se_lun; 2668 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2669 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2670 int ret, all_reg = 0; 2671 2672 if (!se_sess || !se_lun) { 2673 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2674 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2675 return -EINVAL; 2676 } 2677 /* 2678 * Locate the existing *pr_reg via struct se_node_acl pointers 2679 */ 2680 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2681 if (!pr_reg) { 2682 pr_err("SPC-3 PR: Unable to locate" 2683 " PR_REGISTERED *pr_reg for RELEASE\n"); 2684 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2685 return -EINVAL; 2686 } 2687 /* 2688 * From spc4r17 Section 5.7.11.2 Releasing: 2689 * 2690 * If there is no persistent reservation or in response to a persistent 2691 * reservation release request from a registered I_T nexus that is not a 2692 * persistent reservation holder (see 5.7.10), the device server shall 2693 * do the following: 2694 * 2695 * a) Not release the persistent reservation, if any; 2696 * b) Not remove any registrations; and 2697 * c) Complete the command with GOOD status. 2698 */ 2699 spin_lock(&dev->dev_reservation_lock); 2700 pr_res_holder = dev->dev_pr_res_holder; 2701 if (!pr_res_holder) { 2702 /* 2703 * No persistent reservation, return GOOD status. 2704 */ 2705 spin_unlock(&dev->dev_reservation_lock); 2706 core_scsi3_put_pr_reg(pr_reg); 2707 return 0; 2708 } 2709 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2710 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2711 all_reg = 1; 2712 2713 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2714 /* 2715 * Non 'All Registrants' PR Type cases.. 2716 * Release request from a registered I_T nexus that is not a 2717 * persistent reservation holder. return GOOD status. 2718 */ 2719 spin_unlock(&dev->dev_reservation_lock); 2720 core_scsi3_put_pr_reg(pr_reg); 2721 return 0; 2722 } 2723 /* 2724 * From spc4r17 Section 5.7.11.2 Releasing: 2725 * 2726 * Only the persistent reservation holder (see 5.7.10) is allowed to 2727 * release a persistent reservation. 2728 * 2729 * An application client releases the persistent reservation by issuing 2730 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2731 * an I_T nexus that is a persistent reservation holder with the 2732 * following parameters: 2733 * 2734 * a) RESERVATION KEY field set to the value of the reservation key 2735 * that is registered with the logical unit for the I_T nexus; 2736 */ 2737 if (res_key != pr_reg->pr_res_key) { 2738 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2739 " does not match existing SA REGISTER res_key:" 2740 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2741 spin_unlock(&dev->dev_reservation_lock); 2742 core_scsi3_put_pr_reg(pr_reg); 2743 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2744 return -EINVAL; 2745 } 2746 /* 2747 * From spc4r17 Section 5.7.11.2 Releasing and above: 2748 * 2749 * b) TYPE field and SCOPE field set to match the persistent 2750 * reservation being released. 2751 */ 2752 if ((pr_res_holder->pr_res_type != type) || 2753 (pr_res_holder->pr_res_scope != scope)) { 2754 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2755 pr_err("SPC-3 PR RELEASE: Attempted to release" 2756 " reservation from [%s]: %s with different TYPE " 2757 "and/or SCOPE while reservation already held by" 2758 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2759 cmd->se_tfo->get_fabric_name(), 2760 se_sess->se_node_acl->initiatorname, 2761 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2762 pr_res_holder->pr_reg_nacl->initiatorname); 2763 2764 spin_unlock(&dev->dev_reservation_lock); 2765 core_scsi3_put_pr_reg(pr_reg); 2766 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2767 return -EINVAL; 2768 } 2769 /* 2770 * In response to a persistent reservation release request from the 2771 * persistent reservation holder the device server shall perform a 2772 * release by doing the following as an uninterrupted series of actions: 2773 * a) Release the persistent reservation; 2774 * b) Not remove any registration(s); 2775 * c) If the released persistent reservation is a registrants only type 2776 * or all registrants type persistent reservation, 2777 * the device server shall establish a unit attention condition for 2778 * the initiator port associated with every regis- 2779 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2780 * RESERVE OUT command with RELEASE service action was received, 2781 * with the additional sense code set to RESERVATIONS RELEASED; and 2782 * d) If the persistent reservation is of any other type, the device 2783 * server shall not establish a unit attention condition. 2784 */ 2785 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2786 pr_reg, 1); 2787 2788 spin_unlock(&dev->dev_reservation_lock); 2789 2790 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2791 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2792 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2793 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2794 /* 2795 * If no UNIT ATTENTION conditions will be established for 2796 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2797 * go ahead and check for APTPL=1 update+write below 2798 */ 2799 goto write_aptpl; 2800 } 2801 2802 spin_lock(&pr_tmpl->registration_lock); 2803 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2804 pr_reg_list) { 2805 /* 2806 * Do not establish a UNIT ATTENTION condition 2807 * for the calling I_T Nexus 2808 */ 2809 if (pr_reg_p == pr_reg) 2810 continue; 2811 2812 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2813 pr_reg_p->pr_res_mapped_lun, 2814 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2815 } 2816 spin_unlock(&pr_tmpl->registration_lock); 2817 2818 write_aptpl: 2819 if (pr_tmpl->pr_aptpl_active) { 2820 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2821 &pr_reg->pr_aptpl_buf[0], 2822 pr_tmpl->pr_aptpl_buf_len); 2823 if (!ret) 2824 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2825 } 2826 2827 core_scsi3_put_pr_reg(pr_reg); 2828 return 0; 2829 } 2830 2831 static int core_scsi3_emulate_pro_clear( 2832 struct se_cmd *cmd, 2833 u64 res_key) 2834 { 2835 struct se_device *dev = cmd->se_dev; 2836 struct se_node_acl *pr_reg_nacl; 2837 struct se_session *se_sess = cmd->se_sess; 2838 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2839 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2840 u32 pr_res_mapped_lun = 0; 2841 int calling_it_nexus = 0; 2842 /* 2843 * Locate the existing *pr_reg via struct se_node_acl pointers 2844 */ 2845 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2846 se_sess->se_node_acl, se_sess); 2847 if (!pr_reg_n) { 2848 pr_err("SPC-3 PR: Unable to locate" 2849 " PR_REGISTERED *pr_reg for CLEAR\n"); 2850 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2851 return -EINVAL; 2852 } 2853 /* 2854 * From spc4r17 section 5.7.11.6, Clearing: 2855 * 2856 * Any application client may release the persistent reservation and 2857 * remove all registrations from a device server by issuing a 2858 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2859 * registered I_T nexus with the following parameter: 2860 * 2861 * a) RESERVATION KEY field set to the value of the reservation key 2862 * that is registered with the logical unit for the I_T nexus. 2863 */ 2864 if (res_key != pr_reg_n->pr_res_key) { 2865 pr_err("SPC-3 PR REGISTER: Received" 2866 " res_key: 0x%016Lx does not match" 2867 " existing SA REGISTER res_key:" 2868 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2869 core_scsi3_put_pr_reg(pr_reg_n); 2870 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2871 return -EINVAL; 2872 } 2873 /* 2874 * a) Release the persistent reservation, if any; 2875 */ 2876 spin_lock(&dev->dev_reservation_lock); 2877 pr_res_holder = dev->dev_pr_res_holder; 2878 if (pr_res_holder) { 2879 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2880 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2881 pr_res_holder, 0); 2882 } 2883 spin_unlock(&dev->dev_reservation_lock); 2884 /* 2885 * b) Remove all registration(s) (see spc4r17 5.7.7); 2886 */ 2887 spin_lock(&pr_tmpl->registration_lock); 2888 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2889 &pr_tmpl->registration_list, pr_reg_list) { 2890 2891 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2892 pr_reg_nacl = pr_reg->pr_reg_nacl; 2893 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2894 __core_scsi3_free_registration(dev, pr_reg, NULL, 2895 calling_it_nexus); 2896 /* 2897 * e) Establish a unit attention condition for the initiator 2898 * port associated with every registered I_T nexus other 2899 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2900 * command with CLEAR service action was received, with the 2901 * additional sense code set to RESERVATIONS PREEMPTED. 2902 */ 2903 if (!calling_it_nexus) 2904 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2905 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2906 } 2907 spin_unlock(&pr_tmpl->registration_lock); 2908 2909 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2910 cmd->se_tfo->get_fabric_name()); 2911 2912 if (pr_tmpl->pr_aptpl_active) { 2913 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2914 pr_debug("SPC-3 PR: Updated APTPL metadata" 2915 " for CLEAR\n"); 2916 } 2917 2918 core_scsi3_pr_generation(dev); 2919 return 0; 2920 } 2921 2922 /* 2923 * Called with struct se_device->dev_reservation_lock held. 2924 */ 2925 static void __core_scsi3_complete_pro_preempt( 2926 struct se_device *dev, 2927 struct t10_pr_registration *pr_reg, 2928 struct list_head *preempt_and_abort_list, 2929 int type, 2930 int scope, 2931 int abort) 2932 { 2933 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2934 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2935 char i_buf[PR_REG_ISID_ID_LEN]; 2936 int prf_isid; 2937 2938 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2939 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2940 PR_REG_ISID_ID_LEN); 2941 /* 2942 * Do an implict RELEASE of the existing reservation. 2943 */ 2944 if (dev->dev_pr_res_holder) 2945 __core_scsi3_complete_pro_release(dev, nacl, 2946 dev->dev_pr_res_holder, 0); 2947 2948 dev->dev_pr_res_holder = pr_reg; 2949 pr_reg->pr_res_holder = 1; 2950 pr_reg->pr_res_type = type; 2951 pr_reg->pr_res_scope = scope; 2952 2953 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2954 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2955 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2956 core_scsi3_pr_dump_type(type), 2957 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2958 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2959 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2960 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2961 /* 2962 * For PREEMPT_AND_ABORT, add the preempting reservation's 2963 * struct t10_pr_registration to the list that will be compared 2964 * against received CDBs.. 2965 */ 2966 if (preempt_and_abort_list) 2967 list_add_tail(&pr_reg->pr_reg_abort_list, 2968 preempt_and_abort_list); 2969 } 2970 2971 static void core_scsi3_release_preempt_and_abort( 2972 struct list_head *preempt_and_abort_list, 2973 struct t10_pr_registration *pr_reg_holder) 2974 { 2975 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2976 2977 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2978 pr_reg_abort_list) { 2979 2980 list_del(&pr_reg->pr_reg_abort_list); 2981 if (pr_reg_holder == pr_reg) 2982 continue; 2983 if (pr_reg->pr_res_holder) { 2984 pr_warn("pr_reg->pr_res_holder still set\n"); 2985 continue; 2986 } 2987 2988 pr_reg->pr_reg_deve = NULL; 2989 pr_reg->pr_reg_nacl = NULL; 2990 kfree(pr_reg->pr_aptpl_buf); 2991 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2992 } 2993 } 2994 2995 static int core_scsi3_pro_preempt( 2996 struct se_cmd *cmd, 2997 int type, 2998 int scope, 2999 u64 res_key, 3000 u64 sa_res_key, 3001 int abort) 3002 { 3003 struct se_device *dev = cmd->se_dev; 3004 struct se_dev_entry *se_deve; 3005 struct se_node_acl *pr_reg_nacl; 3006 struct se_session *se_sess = cmd->se_sess; 3007 struct list_head preempt_and_abort_list; 3008 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 3009 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3010 u32 pr_res_mapped_lun = 0; 3011 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3012 int prh_type = 0, prh_scope = 0, ret; 3013 3014 if (!se_sess) { 3015 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3016 return -EINVAL; 3017 } 3018 3019 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3020 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3021 se_sess); 3022 if (!pr_reg_n) { 3023 pr_err("SPC-3 PR: Unable to locate" 3024 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3025 (abort) ? "_AND_ABORT" : ""); 3026 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3027 return -EINVAL; 3028 } 3029 if (pr_reg_n->pr_res_key != res_key) { 3030 core_scsi3_put_pr_reg(pr_reg_n); 3031 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3032 return -EINVAL; 3033 } 3034 if (scope != PR_SCOPE_LU_SCOPE) { 3035 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3036 core_scsi3_put_pr_reg(pr_reg_n); 3037 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3038 return -EINVAL; 3039 } 3040 INIT_LIST_HEAD(&preempt_and_abort_list); 3041 3042 spin_lock(&dev->dev_reservation_lock); 3043 pr_res_holder = dev->dev_pr_res_holder; 3044 if (pr_res_holder && 3045 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3046 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3047 all_reg = 1; 3048 3049 if (!all_reg && !sa_res_key) { 3050 spin_unlock(&dev->dev_reservation_lock); 3051 core_scsi3_put_pr_reg(pr_reg_n); 3052 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3053 return -EINVAL; 3054 } 3055 /* 3056 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3057 * 3058 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3059 * persistent reservation holder or there is no persistent reservation 3060 * holder (i.e., there is no persistent reservation), then the device 3061 * server shall perform a preempt by doing the following in an 3062 * uninterrupted series of actions. (See below..) 3063 */ 3064 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3065 /* 3066 * No existing or SA Reservation Key matching reservations.. 3067 * 3068 * PROUT SA PREEMPT with All Registrant type reservations are 3069 * allowed to be processed without a matching SA Reservation Key 3070 */ 3071 spin_lock(&pr_tmpl->registration_lock); 3072 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3073 &pr_tmpl->registration_list, pr_reg_list) { 3074 /* 3075 * Removing of registrations in non all registrants 3076 * type reservations without a matching SA reservation 3077 * key. 3078 * 3079 * a) Remove the registrations for all I_T nexuses 3080 * specified by the SERVICE ACTION RESERVATION KEY 3081 * field; 3082 * b) Ignore the contents of the SCOPE and TYPE fields; 3083 * c) Process tasks as defined in 5.7.1; and 3084 * d) Establish a unit attention condition for the 3085 * initiator port associated with every I_T nexus 3086 * that lost its registration other than the I_T 3087 * nexus on which the PERSISTENT RESERVE OUT command 3088 * was received, with the additional sense code set 3089 * to REGISTRATIONS PREEMPTED. 3090 */ 3091 if (!all_reg) { 3092 if (pr_reg->pr_res_key != sa_res_key) 3093 continue; 3094 3095 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3096 pr_reg_nacl = pr_reg->pr_reg_nacl; 3097 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3098 __core_scsi3_free_registration(dev, pr_reg, 3099 (abort) ? &preempt_and_abort_list : 3100 NULL, calling_it_nexus); 3101 released_regs++; 3102 } else { 3103 /* 3104 * Case for any existing all registrants type 3105 * reservation, follow logic in spc4r17 section 3106 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3107 * 3108 * For a ZERO SA Reservation key, release 3109 * all other registrations and do an implict 3110 * release of active persistent reservation. 3111 * 3112 * For a non-ZERO SA Reservation key, only 3113 * release the matching reservation key from 3114 * registrations. 3115 */ 3116 if ((sa_res_key) && 3117 (pr_reg->pr_res_key != sa_res_key)) 3118 continue; 3119 3120 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3121 if (calling_it_nexus) 3122 continue; 3123 3124 pr_reg_nacl = pr_reg->pr_reg_nacl; 3125 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3126 __core_scsi3_free_registration(dev, pr_reg, 3127 (abort) ? &preempt_and_abort_list : 3128 NULL, 0); 3129 released_regs++; 3130 } 3131 if (!calling_it_nexus) 3132 core_scsi3_ua_allocate(pr_reg_nacl, 3133 pr_res_mapped_lun, 0x2A, 3134 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3135 } 3136 spin_unlock(&pr_tmpl->registration_lock); 3137 /* 3138 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3139 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3140 * RESERVATION KEY field to a value that does not match any 3141 * registered reservation key, then the device server shall 3142 * complete the command with RESERVATION CONFLICT status. 3143 */ 3144 if (!released_regs) { 3145 spin_unlock(&dev->dev_reservation_lock); 3146 core_scsi3_put_pr_reg(pr_reg_n); 3147 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3148 return -EINVAL; 3149 } 3150 /* 3151 * For an existing all registrants type reservation 3152 * with a zero SA rservation key, preempt the existing 3153 * reservation with the new PR type and scope. 3154 */ 3155 if (pr_res_holder && all_reg && !(sa_res_key)) { 3156 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3157 (abort) ? &preempt_and_abort_list : NULL, 3158 type, scope, abort); 3159 3160 if (abort) 3161 core_scsi3_release_preempt_and_abort( 3162 &preempt_and_abort_list, pr_reg_n); 3163 } 3164 spin_unlock(&dev->dev_reservation_lock); 3165 3166 if (pr_tmpl->pr_aptpl_active) { 3167 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3168 &pr_reg_n->pr_aptpl_buf[0], 3169 pr_tmpl->pr_aptpl_buf_len); 3170 if (!ret) 3171 pr_debug("SPC-3 PR: Updated APTPL" 3172 " metadata for PREEMPT%s\n", (abort) ? 3173 "_AND_ABORT" : ""); 3174 } 3175 3176 core_scsi3_put_pr_reg(pr_reg_n); 3177 core_scsi3_pr_generation(cmd->se_dev); 3178 return 0; 3179 } 3180 /* 3181 * The PREEMPTing SA reservation key matches that of the 3182 * existing persistent reservation, first, we check if 3183 * we are preempting our own reservation. 3184 * From spc4r17, section 5.7.11.4.3 Preempting 3185 * persistent reservations and registration handling 3186 * 3187 * If an all registrants persistent reservation is not 3188 * present, it is not an error for the persistent 3189 * reservation holder to preempt itself (i.e., a 3190 * PERSISTENT RESERVE OUT with a PREEMPT service action 3191 * or a PREEMPT AND ABORT service action with the 3192 * SERVICE ACTION RESERVATION KEY value equal to the 3193 * persistent reservation holder's reservation key that 3194 * is received from the persistent reservation holder). 3195 * In that case, the device server shall establish the 3196 * new persistent reservation and maintain the 3197 * registration. 3198 */ 3199 prh_type = pr_res_holder->pr_res_type; 3200 prh_scope = pr_res_holder->pr_res_scope; 3201 /* 3202 * If the SERVICE ACTION RESERVATION KEY field identifies a 3203 * persistent reservation holder (see 5.7.10), the device 3204 * server shall perform a preempt by doing the following as 3205 * an uninterrupted series of actions: 3206 * 3207 * a) Release the persistent reservation for the holder 3208 * identified by the SERVICE ACTION RESERVATION KEY field; 3209 */ 3210 if (pr_reg_n != pr_res_holder) 3211 __core_scsi3_complete_pro_release(dev, 3212 pr_res_holder->pr_reg_nacl, 3213 dev->dev_pr_res_holder, 0); 3214 /* 3215 * b) Remove the registrations for all I_T nexuses identified 3216 * by the SERVICE ACTION RESERVATION KEY field, except the 3217 * I_T nexus that is being used for the PERSISTENT RESERVE 3218 * OUT command. If an all registrants persistent reservation 3219 * is present and the SERVICE ACTION RESERVATION KEY field 3220 * is set to zero, then all registrations shall be removed 3221 * except for that of the I_T nexus that is being used for 3222 * the PERSISTENT RESERVE OUT command; 3223 */ 3224 spin_lock(&pr_tmpl->registration_lock); 3225 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3226 &pr_tmpl->registration_list, pr_reg_list) { 3227 3228 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3229 if (calling_it_nexus) 3230 continue; 3231 3232 if (pr_reg->pr_res_key != sa_res_key) 3233 continue; 3234 3235 pr_reg_nacl = pr_reg->pr_reg_nacl; 3236 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3237 __core_scsi3_free_registration(dev, pr_reg, 3238 (abort) ? &preempt_and_abort_list : NULL, 3239 calling_it_nexus); 3240 /* 3241 * e) Establish a unit attention condition for the initiator 3242 * port associated with every I_T nexus that lost its 3243 * persistent reservation and/or registration, with the 3244 * additional sense code set to REGISTRATIONS PREEMPTED; 3245 */ 3246 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3247 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3248 } 3249 spin_unlock(&pr_tmpl->registration_lock); 3250 /* 3251 * c) Establish a persistent reservation for the preempting 3252 * I_T nexus using the contents of the SCOPE and TYPE fields; 3253 */ 3254 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3255 (abort) ? &preempt_and_abort_list : NULL, 3256 type, scope, abort); 3257 /* 3258 * d) Process tasks as defined in 5.7.1; 3259 * e) See above.. 3260 * f) If the type or scope has changed, then for every I_T nexus 3261 * whose reservation key was not removed, except for the I_T 3262 * nexus on which the PERSISTENT RESERVE OUT command was 3263 * received, the device server shall establish a unit 3264 * attention condition for the initiator port associated with 3265 * that I_T nexus, with the additional sense code set to 3266 * RESERVATIONS RELEASED. If the type or scope have not 3267 * changed, then no unit attention condition(s) shall be 3268 * established for this reason. 3269 */ 3270 if ((prh_type != type) || (prh_scope != scope)) { 3271 spin_lock(&pr_tmpl->registration_lock); 3272 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3273 &pr_tmpl->registration_list, pr_reg_list) { 3274 3275 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3276 if (calling_it_nexus) 3277 continue; 3278 3279 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3280 pr_reg->pr_res_mapped_lun, 0x2A, 3281 ASCQ_2AH_RESERVATIONS_RELEASED); 3282 } 3283 spin_unlock(&pr_tmpl->registration_lock); 3284 } 3285 spin_unlock(&dev->dev_reservation_lock); 3286 /* 3287 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3288 * All received CDBs for the matching existing reservation and 3289 * registrations undergo ABORT_TASK logic. 3290 * 3291 * From there, core_scsi3_release_preempt_and_abort() will 3292 * release every registration in the list (which have already 3293 * been removed from the primary pr_reg list), except the 3294 * new persistent reservation holder, the calling Initiator Port. 3295 */ 3296 if (abort) { 3297 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3298 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3299 pr_reg_n); 3300 } 3301 3302 if (pr_tmpl->pr_aptpl_active) { 3303 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3304 &pr_reg_n->pr_aptpl_buf[0], 3305 pr_tmpl->pr_aptpl_buf_len); 3306 if (!ret) 3307 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3308 "%s\n", (abort) ? "_AND_ABORT" : ""); 3309 } 3310 3311 core_scsi3_put_pr_reg(pr_reg_n); 3312 core_scsi3_pr_generation(cmd->se_dev); 3313 return 0; 3314 } 3315 3316 static int core_scsi3_emulate_pro_preempt( 3317 struct se_cmd *cmd, 3318 int type, 3319 int scope, 3320 u64 res_key, 3321 u64 sa_res_key, 3322 int abort) 3323 { 3324 int ret = 0; 3325 3326 switch (type) { 3327 case PR_TYPE_WRITE_EXCLUSIVE: 3328 case PR_TYPE_EXCLUSIVE_ACCESS: 3329 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3330 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3331 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3332 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3333 ret = core_scsi3_pro_preempt(cmd, type, scope, 3334 res_key, sa_res_key, abort); 3335 break; 3336 default: 3337 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3338 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3339 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3340 return -EINVAL; 3341 } 3342 3343 return ret; 3344 } 3345 3346 3347 static int core_scsi3_emulate_pro_register_and_move( 3348 struct se_cmd *cmd, 3349 u64 res_key, 3350 u64 sa_res_key, 3351 int aptpl, 3352 int unreg) 3353 { 3354 struct se_session *se_sess = cmd->se_sess; 3355 struct se_device *dev = cmd->se_dev; 3356 struct se_dev_entry *se_deve, *dest_se_deve = NULL; 3357 struct se_lun *se_lun = cmd->se_lun; 3358 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3359 struct se_port *se_port; 3360 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3361 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3362 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3363 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3364 unsigned char *buf; 3365 unsigned char *initiator_str; 3366 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3367 u32 tid_len, tmp_tid_len; 3368 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3369 unsigned short rtpi; 3370 unsigned char proto_ident; 3371 3372 if (!se_sess || !se_lun) { 3373 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3374 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3375 return -EINVAL; 3376 } 3377 memset(dest_iport, 0, 64); 3378 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3379 se_tpg = se_sess->se_tpg; 3380 tf_ops = se_tpg->se_tpg_tfo; 3381 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3382 /* 3383 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3384 * Register behaviors for a REGISTER AND MOVE service action 3385 * 3386 * Locate the existing *pr_reg via struct se_node_acl pointers 3387 */ 3388 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3389 se_sess); 3390 if (!pr_reg) { 3391 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3392 " *pr_reg for REGISTER_AND_MOVE\n"); 3393 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3394 return -EINVAL; 3395 } 3396 /* 3397 * The provided reservation key much match the existing reservation key 3398 * provided during this initiator's I_T nexus registration. 3399 */ 3400 if (res_key != pr_reg->pr_res_key) { 3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3402 " res_key: 0x%016Lx does not match existing SA REGISTER" 3403 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3404 core_scsi3_put_pr_reg(pr_reg); 3405 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3406 return -EINVAL; 3407 } 3408 /* 3409 * The service active reservation key needs to be non zero 3410 */ 3411 if (!sa_res_key) { 3412 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3413 " sa_res_key\n"); 3414 core_scsi3_put_pr_reg(pr_reg); 3415 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3416 return -EINVAL; 3417 } 3418 3419 /* 3420 * Determine the Relative Target Port Identifier where the reservation 3421 * will be moved to for the TransportID containing SCSI initiator WWN 3422 * information. 3423 */ 3424 buf = transport_kmap_data_sg(cmd); 3425 rtpi = (buf[18] & 0xff) << 8; 3426 rtpi |= buf[19] & 0xff; 3427 tid_len = (buf[20] & 0xff) << 24; 3428 tid_len |= (buf[21] & 0xff) << 16; 3429 tid_len |= (buf[22] & 0xff) << 8; 3430 tid_len |= buf[23] & 0xff; 3431 transport_kunmap_data_sg(cmd); 3432 buf = NULL; 3433 3434 if ((tid_len + 24) != cmd->data_length) { 3435 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3436 " does not equal CDB data_length: %u\n", tid_len, 3437 cmd->data_length); 3438 core_scsi3_put_pr_reg(pr_reg); 3439 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3440 return -EINVAL; 3441 } 3442 3443 spin_lock(&dev->se_port_lock); 3444 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3445 if (se_port->sep_rtpi != rtpi) 3446 continue; 3447 dest_se_tpg = se_port->sep_tpg; 3448 if (!dest_se_tpg) 3449 continue; 3450 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3451 if (!dest_tf_ops) 3452 continue; 3453 3454 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3455 smp_mb__after_atomic_inc(); 3456 spin_unlock(&dev->se_port_lock); 3457 3458 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3459 if (ret != 0) { 3460 pr_err("core_scsi3_tpg_depend_item() failed" 3461 " for dest_se_tpg\n"); 3462 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3463 smp_mb__after_atomic_dec(); 3464 core_scsi3_put_pr_reg(pr_reg); 3465 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3466 return -EINVAL; 3467 } 3468 3469 spin_lock(&dev->se_port_lock); 3470 break; 3471 } 3472 spin_unlock(&dev->se_port_lock); 3473 3474 if (!dest_se_tpg || !dest_tf_ops) { 3475 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3476 " fabric ops from Relative Target Port Identifier:" 3477 " %hu\n", rtpi); 3478 core_scsi3_put_pr_reg(pr_reg); 3479 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3480 return -EINVAL; 3481 } 3482 3483 buf = transport_kmap_data_sg(cmd); 3484 proto_ident = (buf[24] & 0x0f); 3485 #if 0 3486 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3487 " 0x%02x\n", proto_ident); 3488 #endif 3489 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3490 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3491 " proto_ident: 0x%02x does not match ident: 0x%02x" 3492 " from fabric: %s\n", proto_ident, 3493 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3494 dest_tf_ops->get_fabric_name()); 3495 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3496 ret = -EINVAL; 3497 goto out; 3498 } 3499 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3500 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3501 " containg a valid tpg_parse_pr_out_transport_id" 3502 " function pointer\n"); 3503 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3504 ret = -EINVAL; 3505 goto out; 3506 } 3507 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3508 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3509 if (!initiator_str) { 3510 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3511 " initiator_str from Transport ID\n"); 3512 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3513 ret = -EINVAL; 3514 goto out; 3515 } 3516 3517 transport_kunmap_data_sg(cmd); 3518 buf = NULL; 3519 3520 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3521 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3522 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3523 iport_ptr : ""); 3524 /* 3525 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3526 * action specifies a TransportID that is the same as the initiator port 3527 * of the I_T nexus for the command received, then the command shall 3528 * be terminated with CHECK CONDITION status, with the sense key set to 3529 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3530 * IN PARAMETER LIST. 3531 */ 3532 pr_reg_nacl = pr_reg->pr_reg_nacl; 3533 matching_iname = (!strcmp(initiator_str, 3534 pr_reg_nacl->initiatorname)) ? 1 : 0; 3535 if (!matching_iname) 3536 goto after_iport_check; 3537 3538 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3539 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3540 " matches: %s on received I_T Nexus\n", initiator_str, 3541 pr_reg_nacl->initiatorname); 3542 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3543 ret = -EINVAL; 3544 goto out; 3545 } 3546 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3547 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3548 " matches: %s %s on received I_T Nexus\n", 3549 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3550 pr_reg->pr_reg_isid); 3551 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3552 ret = -EINVAL; 3553 goto out; 3554 } 3555 after_iport_check: 3556 /* 3557 * Locate the destination struct se_node_acl from the received Transport ID 3558 */ 3559 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3560 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3561 initiator_str); 3562 if (dest_node_acl) { 3563 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3564 smp_mb__after_atomic_inc(); 3565 } 3566 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3567 3568 if (!dest_node_acl) { 3569 pr_err("Unable to locate %s dest_node_acl for" 3570 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3571 initiator_str); 3572 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3573 ret = -EINVAL; 3574 goto out; 3575 } 3576 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3577 if (ret != 0) { 3578 pr_err("core_scsi3_nodeacl_depend_item() for" 3579 " dest_node_acl\n"); 3580 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3581 smp_mb__after_atomic_dec(); 3582 dest_node_acl = NULL; 3583 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3584 ret = -EINVAL; 3585 goto out; 3586 } 3587 #if 0 3588 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3589 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3590 dest_node_acl->initiatorname); 3591 #endif 3592 /* 3593 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3594 * PORT IDENTIFIER. 3595 */ 3596 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3597 if (!dest_se_deve) { 3598 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3599 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3600 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3601 ret = -EINVAL; 3602 goto out; 3603 } 3604 3605 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3606 if (ret < 0) { 3607 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3608 atomic_dec(&dest_se_deve->pr_ref_count); 3609 smp_mb__after_atomic_dec(); 3610 dest_se_deve = NULL; 3611 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3612 ret = -EINVAL; 3613 goto out; 3614 } 3615 #if 0 3616 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3617 " ACL for dest_se_deve->mapped_lun: %u\n", 3618 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3619 dest_se_deve->mapped_lun); 3620 #endif 3621 /* 3622 * A persistent reservation needs to already existing in order to 3623 * successfully complete the REGISTER_AND_MOVE service action.. 3624 */ 3625 spin_lock(&dev->dev_reservation_lock); 3626 pr_res_holder = dev->dev_pr_res_holder; 3627 if (!pr_res_holder) { 3628 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3629 " currently held\n"); 3630 spin_unlock(&dev->dev_reservation_lock); 3631 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3632 ret = -EINVAL; 3633 goto out; 3634 } 3635 /* 3636 * The received on I_T Nexus must be the reservation holder. 3637 * 3638 * From spc4r17 section 5.7.8 Table 50 -- 3639 * Register behaviors for a REGISTER AND MOVE service action 3640 */ 3641 if (pr_res_holder != pr_reg) { 3642 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3643 " Nexus is not reservation holder\n"); 3644 spin_unlock(&dev->dev_reservation_lock); 3645 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3646 ret = -EINVAL; 3647 goto out; 3648 } 3649 /* 3650 * From spc4r17 section 5.7.8: registering and moving reservation 3651 * 3652 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3653 * action is received and the established persistent reservation is a 3654 * Write Exclusive - All Registrants type or Exclusive Access - 3655 * All Registrants type reservation, then the command shall be completed 3656 * with RESERVATION CONFLICT status. 3657 */ 3658 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3659 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3660 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3661 " reservation for type: %s\n", 3662 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3663 spin_unlock(&dev->dev_reservation_lock); 3664 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3665 ret = -EINVAL; 3666 goto out; 3667 } 3668 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3669 /* 3670 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3671 */ 3672 type = pr_res_holder->pr_res_type; 3673 scope = pr_res_holder->pr_res_type; 3674 /* 3675 * c) Associate the reservation key specified in the SERVICE ACTION 3676 * RESERVATION KEY field with the I_T nexus specified as the 3677 * destination of the register and move, where: 3678 * A) The I_T nexus is specified by the TransportID and the 3679 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3680 * B) Regardless of the TransportID format used, the association for 3681 * the initiator port is based on either the initiator port name 3682 * (see 3.1.71) on SCSI transport protocols where port names are 3683 * required or the initiator port identifier (see 3.1.70) on SCSI 3684 * transport protocols where port names are not required; 3685 * d) Register the reservation key specified in the SERVICE ACTION 3686 * RESERVATION KEY field; 3687 * e) Retain the reservation key specified in the SERVICE ACTION 3688 * RESERVATION KEY field and associated information; 3689 * 3690 * Also, It is not an error for a REGISTER AND MOVE service action to 3691 * register an I_T nexus that is already registered with the same 3692 * reservation key or a different reservation key. 3693 */ 3694 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3695 iport_ptr); 3696 if (!dest_pr_reg) { 3697 ret = core_scsi3_alloc_registration(cmd->se_dev, 3698 dest_node_acl, dest_se_deve, iport_ptr, 3699 sa_res_key, 0, aptpl, 2, 1); 3700 if (ret != 0) { 3701 spin_unlock(&dev->dev_reservation_lock); 3702 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3703 ret = -EINVAL; 3704 goto out; 3705 } 3706 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3707 iport_ptr); 3708 new_reg = 1; 3709 } 3710 /* 3711 * f) Release the persistent reservation for the persistent reservation 3712 * holder (i.e., the I_T nexus on which the 3713 */ 3714 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3715 dev->dev_pr_res_holder, 0); 3716 /* 3717 * g) Move the persistent reservation to the specified I_T nexus using 3718 * the same scope and type as the persistent reservation released in 3719 * item f); and 3720 */ 3721 dev->dev_pr_res_holder = dest_pr_reg; 3722 dest_pr_reg->pr_res_holder = 1; 3723 dest_pr_reg->pr_res_type = type; 3724 pr_reg->pr_res_scope = scope; 3725 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3726 PR_REG_ISID_ID_LEN); 3727 /* 3728 * Increment PRGeneration for existing registrations.. 3729 */ 3730 if (!new_reg) 3731 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3732 spin_unlock(&dev->dev_reservation_lock); 3733 3734 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3735 " created new reservation holder TYPE: %s on object RTPI:" 3736 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3737 core_scsi3_pr_dump_type(type), rtpi, 3738 dest_pr_reg->pr_res_generation); 3739 pr_debug("SPC-3 PR Successfully moved reservation from" 3740 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3741 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3742 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3743 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3744 iport_ptr : ""); 3745 /* 3746 * It is now safe to release configfs group dependencies for destination 3747 * of Transport ID Initiator Device/Port Identifier 3748 */ 3749 core_scsi3_lunacl_undepend_item(dest_se_deve); 3750 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3751 core_scsi3_tpg_undepend_item(dest_se_tpg); 3752 /* 3753 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3754 * nexus on which PERSISTENT RESERVE OUT command was received. 3755 */ 3756 if (unreg) { 3757 spin_lock(&pr_tmpl->registration_lock); 3758 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3759 spin_unlock(&pr_tmpl->registration_lock); 3760 } else 3761 core_scsi3_put_pr_reg(pr_reg); 3762 3763 /* 3764 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3765 * write out the updated metadata to struct file for this SCSI device. 3766 */ 3767 if (!aptpl) { 3768 pr_tmpl->pr_aptpl_active = 0; 3769 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3770 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3771 " REGISTER_AND_MOVE\n"); 3772 } else { 3773 pr_tmpl->pr_aptpl_active = 1; 3774 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3775 &dest_pr_reg->pr_aptpl_buf[0], 3776 pr_tmpl->pr_aptpl_buf_len); 3777 if (!ret) 3778 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3779 " REGISTER_AND_MOVE\n"); 3780 } 3781 3782 transport_kunmap_data_sg(cmd); 3783 3784 core_scsi3_put_pr_reg(dest_pr_reg); 3785 return 0; 3786 out: 3787 if (buf) 3788 transport_kunmap_data_sg(cmd); 3789 if (dest_se_deve) 3790 core_scsi3_lunacl_undepend_item(dest_se_deve); 3791 if (dest_node_acl) 3792 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3793 core_scsi3_tpg_undepend_item(dest_se_tpg); 3794 core_scsi3_put_pr_reg(pr_reg); 3795 return ret; 3796 } 3797 3798 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3799 { 3800 unsigned int __v1, __v2; 3801 3802 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3803 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3804 3805 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3806 } 3807 3808 /* 3809 * See spc4r17 section 6.14 Table 170 3810 */ 3811 int target_scsi3_emulate_pr_out(struct se_task *task) 3812 { 3813 struct se_cmd *cmd = task->task_se_cmd; 3814 unsigned char *cdb = &cmd->t_task_cdb[0]; 3815 unsigned char *buf; 3816 u64 res_key, sa_res_key; 3817 int sa, scope, type, aptpl; 3818 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3819 int ret; 3820 3821 /* 3822 * Following spc2r20 5.5.1 Reservations overview: 3823 * 3824 * If a logical unit has been reserved by any RESERVE command and is 3825 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3826 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3827 * initiator or service action and shall terminate with a RESERVATION 3828 * CONFLICT status. 3829 */ 3830 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3831 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3832 " SPC-2 reservation is held, returning" 3833 " RESERVATION_CONFLICT\n"); 3834 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3835 ret = EINVAL; 3836 goto out; 3837 } 3838 3839 /* 3840 * FIXME: A NULL struct se_session pointer means an this is not coming from 3841 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3842 */ 3843 if (!cmd->se_sess) { 3844 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3845 return -EINVAL; 3846 } 3847 3848 if (cmd->data_length < 24) { 3849 pr_warn("SPC-PR: Received PR OUT parameter list" 3850 " length too small: %u\n", cmd->data_length); 3851 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3852 ret = -EINVAL; 3853 goto out; 3854 } 3855 /* 3856 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3857 */ 3858 sa = (cdb[1] & 0x1f); 3859 scope = (cdb[2] & 0xf0); 3860 type = (cdb[2] & 0x0f); 3861 3862 buf = transport_kmap_data_sg(cmd); 3863 /* 3864 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3865 */ 3866 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3867 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3868 /* 3869 * REGISTER_AND_MOVE uses a different SA parameter list containing 3870 * SCSI TransportIDs. 3871 */ 3872 if (sa != PRO_REGISTER_AND_MOVE) { 3873 spec_i_pt = (buf[20] & 0x08); 3874 all_tg_pt = (buf[20] & 0x04); 3875 aptpl = (buf[20] & 0x01); 3876 } else { 3877 aptpl = (buf[17] & 0x01); 3878 unreg = (buf[17] & 0x02); 3879 } 3880 transport_kunmap_data_sg(cmd); 3881 buf = NULL; 3882 3883 /* 3884 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3885 */ 3886 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3887 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3888 ret = -EINVAL; 3889 goto out; 3890 } 3891 3892 /* 3893 * From spc4r17 section 6.14: 3894 * 3895 * If the SPEC_I_PT bit is set to zero, the service action is not 3896 * REGISTER AND MOVE, and the parameter list length is not 24, then 3897 * the command shall be terminated with CHECK CONDITION status, with 3898 * the sense key set to ILLEGAL REQUEST, and the additional sense 3899 * code set to PARAMETER LIST LENGTH ERROR. 3900 */ 3901 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3902 (cmd->data_length != 24)) { 3903 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3904 " list length: %u\n", cmd->data_length); 3905 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3906 ret = -EINVAL; 3907 goto out; 3908 } 3909 /* 3910 * (core_scsi3_emulate_pro_* function parameters 3911 * are defined by spc4r17 Table 174: 3912 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3913 */ 3914 switch (sa) { 3915 case PRO_REGISTER: 3916 ret = core_scsi3_emulate_pro_register(cmd, 3917 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3918 break; 3919 case PRO_RESERVE: 3920 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3921 break; 3922 case PRO_RELEASE: 3923 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3924 break; 3925 case PRO_CLEAR: 3926 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3927 break; 3928 case PRO_PREEMPT: 3929 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3930 res_key, sa_res_key, 0); 3931 break; 3932 case PRO_PREEMPT_AND_ABORT: 3933 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3934 res_key, sa_res_key, 1); 3935 break; 3936 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3937 ret = core_scsi3_emulate_pro_register(cmd, 3938 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3939 break; 3940 case PRO_REGISTER_AND_MOVE: 3941 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3942 sa_res_key, aptpl, unreg); 3943 break; 3944 default: 3945 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3946 " action: 0x%02x\n", cdb[1] & 0x1f); 3947 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3948 ret = -EINVAL; 3949 break; 3950 } 3951 3952 out: 3953 if (!ret) { 3954 task->task_scsi_status = GOOD; 3955 transport_complete_task(task, 1); 3956 } 3957 return ret; 3958 } 3959 3960 /* 3961 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3962 * 3963 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3964 */ 3965 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3966 { 3967 struct se_device *se_dev = cmd->se_dev; 3968 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3969 struct t10_pr_registration *pr_reg; 3970 unsigned char *buf; 3971 u32 add_len = 0, off = 8; 3972 3973 if (cmd->data_length < 8) { 3974 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3975 " too small\n", cmd->data_length); 3976 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3977 return -EINVAL; 3978 } 3979 3980 buf = transport_kmap_data_sg(cmd); 3981 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3982 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3983 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3984 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3985 3986 spin_lock(&su_dev->t10_pr.registration_lock); 3987 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3988 pr_reg_list) { 3989 /* 3990 * Check for overflow of 8byte PRI READ_KEYS payload and 3991 * next reservation key list descriptor. 3992 */ 3993 if ((add_len + 8) > (cmd->data_length - 8)) 3994 break; 3995 3996 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3997 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3998 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3999 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4000 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4001 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4002 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4003 buf[off++] = (pr_reg->pr_res_key & 0xff); 4004 4005 add_len += 8; 4006 } 4007 spin_unlock(&su_dev->t10_pr.registration_lock); 4008 4009 buf[4] = ((add_len >> 24) & 0xff); 4010 buf[5] = ((add_len >> 16) & 0xff); 4011 buf[6] = ((add_len >> 8) & 0xff); 4012 buf[7] = (add_len & 0xff); 4013 4014 transport_kunmap_data_sg(cmd); 4015 4016 return 0; 4017 } 4018 4019 /* 4020 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4021 * 4022 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4023 */ 4024 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4025 { 4026 struct se_device *se_dev = cmd->se_dev; 4027 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4028 struct t10_pr_registration *pr_reg; 4029 unsigned char *buf; 4030 u64 pr_res_key; 4031 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4032 4033 if (cmd->data_length < 8) { 4034 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4035 " too small\n", cmd->data_length); 4036 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4037 return -EINVAL; 4038 } 4039 4040 buf = transport_kmap_data_sg(cmd); 4041 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4042 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4043 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4044 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4045 4046 spin_lock(&se_dev->dev_reservation_lock); 4047 pr_reg = se_dev->dev_pr_res_holder; 4048 if ((pr_reg)) { 4049 /* 4050 * Set the hardcoded Additional Length 4051 */ 4052 buf[4] = ((add_len >> 24) & 0xff); 4053 buf[5] = ((add_len >> 16) & 0xff); 4054 buf[6] = ((add_len >> 8) & 0xff); 4055 buf[7] = (add_len & 0xff); 4056 4057 if (cmd->data_length < 22) 4058 goto err; 4059 4060 /* 4061 * Set the Reservation key. 4062 * 4063 * From spc4r17, section 5.7.10: 4064 * A persistent reservation holder has its reservation key 4065 * returned in the parameter data from a PERSISTENT 4066 * RESERVE IN command with READ RESERVATION service action as 4067 * follows: 4068 * a) For a persistent reservation of the type Write Exclusive 4069 * - All Registrants or Exclusive Access All Regitrants, 4070 * the reservation key shall be set to zero; or 4071 * b) For all other persistent reservation types, the 4072 * reservation key shall be set to the registered 4073 * reservation key for the I_T nexus that holds the 4074 * persistent reservation. 4075 */ 4076 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4077 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4078 pr_res_key = 0; 4079 else 4080 pr_res_key = pr_reg->pr_res_key; 4081 4082 buf[8] = ((pr_res_key >> 56) & 0xff); 4083 buf[9] = ((pr_res_key >> 48) & 0xff); 4084 buf[10] = ((pr_res_key >> 40) & 0xff); 4085 buf[11] = ((pr_res_key >> 32) & 0xff); 4086 buf[12] = ((pr_res_key >> 24) & 0xff); 4087 buf[13] = ((pr_res_key >> 16) & 0xff); 4088 buf[14] = ((pr_res_key >> 8) & 0xff); 4089 buf[15] = (pr_res_key & 0xff); 4090 /* 4091 * Set the SCOPE and TYPE 4092 */ 4093 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4094 (pr_reg->pr_res_type & 0x0f); 4095 } 4096 4097 err: 4098 spin_unlock(&se_dev->dev_reservation_lock); 4099 transport_kunmap_data_sg(cmd); 4100 4101 return 0; 4102 } 4103 4104 /* 4105 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4106 * 4107 * See spc4r17 section 6.13.4 Table 165 4108 */ 4109 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4110 { 4111 struct se_device *dev = cmd->se_dev; 4112 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4113 unsigned char *buf; 4114 u16 add_len = 8; /* Hardcoded to 8. */ 4115 4116 if (cmd->data_length < 6) { 4117 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4118 " %u too small\n", cmd->data_length); 4119 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4120 return -EINVAL; 4121 } 4122 4123 buf = transport_kmap_data_sg(cmd); 4124 4125 buf[0] = ((add_len << 8) & 0xff); 4126 buf[1] = (add_len & 0xff); 4127 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4128 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4129 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4130 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4131 /* 4132 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4133 * set the TMV: Task Mask Valid bit. 4134 */ 4135 buf[3] |= 0x80; 4136 /* 4137 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4138 */ 4139 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4140 /* 4141 * PTPL_A: Persistence across Target Power Loss Active bit 4142 */ 4143 if (pr_tmpl->pr_aptpl_active) 4144 buf[3] |= 0x01; 4145 /* 4146 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4147 */ 4148 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4149 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4150 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4151 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4152 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4153 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4154 4155 transport_kunmap_data_sg(cmd); 4156 4157 return 0; 4158 } 4159 4160 /* 4161 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4162 * 4163 * See spc4r17 section 6.13.5 Table 168 and 169 4164 */ 4165 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4166 { 4167 struct se_device *se_dev = cmd->se_dev; 4168 struct se_node_acl *se_nacl; 4169 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4170 struct se_portal_group *se_tpg; 4171 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4172 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4173 unsigned char *buf; 4174 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4175 u32 off = 8; /* off into first Full Status descriptor */ 4176 int format_code = 0; 4177 4178 if (cmd->data_length < 8) { 4179 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4180 " too small\n", cmd->data_length); 4181 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4182 return -EINVAL; 4183 } 4184 4185 buf = transport_kmap_data_sg(cmd); 4186 4187 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4188 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4189 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4190 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4191 4192 spin_lock(&pr_tmpl->registration_lock); 4193 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4194 &pr_tmpl->registration_list, pr_reg_list) { 4195 4196 se_nacl = pr_reg->pr_reg_nacl; 4197 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4198 add_desc_len = 0; 4199 4200 atomic_inc(&pr_reg->pr_res_holders); 4201 smp_mb__after_atomic_inc(); 4202 spin_unlock(&pr_tmpl->registration_lock); 4203 /* 4204 * Determine expected length of $FABRIC_MOD specific 4205 * TransportID full status descriptor.. 4206 */ 4207 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4208 se_tpg, se_nacl, pr_reg, &format_code); 4209 4210 if ((exp_desc_len + add_len) > cmd->data_length) { 4211 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4212 " out of buffer: %d\n", cmd->data_length); 4213 spin_lock(&pr_tmpl->registration_lock); 4214 atomic_dec(&pr_reg->pr_res_holders); 4215 smp_mb__after_atomic_dec(); 4216 break; 4217 } 4218 /* 4219 * Set RESERVATION KEY 4220 */ 4221 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4222 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4223 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4224 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4225 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4226 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4227 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4228 buf[off++] = (pr_reg->pr_res_key & 0xff); 4229 off += 4; /* Skip Over Reserved area */ 4230 4231 /* 4232 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4233 */ 4234 if (pr_reg->pr_reg_all_tg_pt) 4235 buf[off] = 0x02; 4236 /* 4237 * The struct se_lun pointer will be present for the 4238 * reservation holder for PR_HOLDER bit. 4239 * 4240 * Also, if this registration is the reservation 4241 * holder, fill in SCOPE and TYPE in the next byte. 4242 */ 4243 if (pr_reg->pr_res_holder) { 4244 buf[off++] |= 0x01; 4245 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4246 (pr_reg->pr_res_type & 0x0f); 4247 } else 4248 off += 2; 4249 4250 off += 4; /* Skip over reserved area */ 4251 /* 4252 * From spc4r17 6.3.15: 4253 * 4254 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4255 * IDENTIFIER field contains the relative port identifier (see 4256 * 3.1.120) of the target port that is part of the I_T nexus 4257 * described by this full status descriptor. If the ALL_TG_PT 4258 * bit is set to one, the contents of the RELATIVE TARGET PORT 4259 * IDENTIFIER field are not defined by this standard. 4260 */ 4261 if (!pr_reg->pr_reg_all_tg_pt) { 4262 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4263 4264 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4265 buf[off++] = (port->sep_rtpi & 0xff); 4266 } else 4267 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4268 4269 /* 4270 * Now, have the $FABRIC_MOD fill in the protocol identifier 4271 */ 4272 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4273 se_nacl, pr_reg, &format_code, &buf[off+4]); 4274 4275 spin_lock(&pr_tmpl->registration_lock); 4276 atomic_dec(&pr_reg->pr_res_holders); 4277 smp_mb__after_atomic_dec(); 4278 /* 4279 * Set the ADDITIONAL DESCRIPTOR LENGTH 4280 */ 4281 buf[off++] = ((desc_len >> 24) & 0xff); 4282 buf[off++] = ((desc_len >> 16) & 0xff); 4283 buf[off++] = ((desc_len >> 8) & 0xff); 4284 buf[off++] = (desc_len & 0xff); 4285 /* 4286 * Size of full desctipor header minus TransportID 4287 * containing $FABRIC_MOD specific) initiator device/port 4288 * WWN information. 4289 * 4290 * See spc4r17 Section 6.13.5 Table 169 4291 */ 4292 add_desc_len = (24 + desc_len); 4293 4294 off += desc_len; 4295 add_len += add_desc_len; 4296 } 4297 spin_unlock(&pr_tmpl->registration_lock); 4298 /* 4299 * Set ADDITIONAL_LENGTH 4300 */ 4301 buf[4] = ((add_len >> 24) & 0xff); 4302 buf[5] = ((add_len >> 16) & 0xff); 4303 buf[6] = ((add_len >> 8) & 0xff); 4304 buf[7] = (add_len & 0xff); 4305 4306 transport_kunmap_data_sg(cmd); 4307 4308 return 0; 4309 } 4310 4311 int target_scsi3_emulate_pr_in(struct se_task *task) 4312 { 4313 struct se_cmd *cmd = task->task_se_cmd; 4314 int ret; 4315 4316 /* 4317 * Following spc2r20 5.5.1 Reservations overview: 4318 * 4319 * If a logical unit has been reserved by any RESERVE command and is 4320 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4321 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4322 * initiator or service action and shall terminate with a RESERVATION 4323 * CONFLICT status. 4324 */ 4325 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4326 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4327 " SPC-2 reservation is held, returning" 4328 " RESERVATION_CONFLICT\n"); 4329 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4330 return -EINVAL; 4331 } 4332 4333 switch (cmd->t_task_cdb[1] & 0x1f) { 4334 case PRI_READ_KEYS: 4335 ret = core_scsi3_pri_read_keys(cmd); 4336 break; 4337 case PRI_READ_RESERVATION: 4338 ret = core_scsi3_pri_read_reservation(cmd); 4339 break; 4340 case PRI_REPORT_CAPABILITIES: 4341 ret = core_scsi3_pri_report_capabilities(cmd); 4342 break; 4343 case PRI_READ_FULL_STATUS: 4344 ret = core_scsi3_pri_read_full_status(cmd); 4345 break; 4346 default: 4347 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4348 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4349 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4350 ret = -EINVAL; 4351 break; 4352 } 4353 4354 if (!ret) { 4355 task->task_scsi_status = GOOD; 4356 transport_complete_task(task, 1); 4357 } 4358 return ret; 4359 } 4360 4361 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4362 { 4363 return 0; 4364 } 4365 4366 static int core_pt_seq_non_holder( 4367 struct se_cmd *cmd, 4368 unsigned char *cdb, 4369 u32 pr_reg_type) 4370 { 4371 return 0; 4372 } 4373 4374 int core_setup_reservations(struct se_device *dev, int force_pt) 4375 { 4376 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4377 struct t10_reservation *rest = &su_dev->t10_pr; 4378 /* 4379 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4380 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4381 * cause a problem because libata and some SATA RAID HBAs appear 4382 * under Linux/SCSI, but to emulate reservations themselves. 4383 */ 4384 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4385 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4386 rest->res_type = SPC_PASSTHROUGH; 4387 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4388 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4389 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4390 " emulation\n", dev->transport->name); 4391 return 0; 4392 } 4393 /* 4394 * If SPC-3 or above is reported by real or emulated struct se_device, 4395 * use emulated Persistent Reservations. 4396 */ 4397 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4398 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4399 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4400 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4401 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4402 " emulation\n", dev->transport->name); 4403 } else { 4404 rest->res_type = SPC2_RESERVATIONS; 4405 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4406 rest->pr_ops.t10_seq_non_holder = 4407 &core_scsi2_reservation_seq_non_holder; 4408 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4409 dev->transport->name); 4410 } 4411 4412 return 0; 4413 } 4414