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_cmd *cmd) 197 { 198 struct se_device *dev = cmd->se_dev; 199 struct se_session *sess = cmd->se_sess; 200 struct se_portal_group *tpg; 201 int ret = 0, rc; 202 203 if (!sess || !sess->se_tpg) 204 goto out; 205 rc = target_check_scsi2_reservation_conflict(cmd); 206 if (rc == 1) 207 goto out; 208 else if (rc < 0) { 209 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 210 ret = -EINVAL; 211 goto out; 212 } 213 214 ret = 0; 215 spin_lock(&dev->dev_reservation_lock); 216 if (!dev->dev_reserved_node_acl || !sess) 217 goto out_unlock; 218 219 if (dev->dev_reserved_node_acl != sess->se_node_acl) 220 goto out_unlock; 221 222 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 223 goto out_unlock; 224 225 dev->dev_reserved_node_acl = NULL; 226 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 227 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 228 dev->dev_res_bin_isid = 0; 229 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 230 } 231 tpg = sess->se_tpg; 232 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 233 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 234 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 235 sess->se_node_acl->initiatorname); 236 237 out_unlock: 238 spin_unlock(&dev->dev_reservation_lock); 239 out: 240 if (!ret) 241 target_complete_cmd(cmd, GOOD); 242 return ret; 243 } 244 245 int target_scsi2_reservation_reserve(struct se_cmd *cmd) 246 { 247 struct se_device *dev = cmd->se_dev; 248 struct se_session *sess = cmd->se_sess; 249 struct se_portal_group *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 || !sess->se_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 tpg = sess->se_tpg; 277 spin_lock(&dev->dev_reservation_lock); 278 if (dev->dev_reserved_node_acl && 279 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 280 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 281 tpg->se_tpg_tfo->get_fabric_name()); 282 pr_err("Original reserver LUN: %u %s\n", 283 cmd->se_lun->unpacked_lun, 284 dev->dev_reserved_node_acl->initiatorname); 285 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 286 " from %s \n", cmd->se_lun->unpacked_lun, 287 cmd->se_deve->mapped_lun, 288 sess->se_node_acl->initiatorname); 289 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 290 ret = -EINVAL; 291 goto out_unlock; 292 } 293 294 dev->dev_reserved_node_acl = sess->se_node_acl; 295 dev->dev_flags |= DF_SPC2_RESERVATIONS; 296 if (sess->sess_bin_isid != 0) { 297 dev->dev_res_bin_isid = sess->sess_bin_isid; 298 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 299 } 300 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 301 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 302 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 303 sess->se_node_acl->initiatorname); 304 305 out_unlock: 306 spin_unlock(&dev->dev_reservation_lock); 307 out: 308 if (!ret) 309 target_complete_cmd(cmd, GOOD); 310 return ret; 311 } 312 313 314 /* 315 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 316 * 317 * This function is called by those initiator ports who are *NOT* 318 * the active PR reservation holder when a reservation is present. 319 */ 320 static int core_scsi3_pr_seq_non_holder( 321 struct se_cmd *cmd, 322 unsigned char *cdb, 323 u32 pr_reg_type) 324 { 325 struct se_dev_entry *se_deve; 326 struct se_session *se_sess = cmd->se_sess; 327 int other_cdb = 0, ignore_reg; 328 int registered_nexus = 0, ret = 1; /* Conflict by default */ 329 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 330 int we = 0; /* Write Exclusive */ 331 int legacy = 0; /* Act like a legacy device and return 332 * RESERVATION CONFLICT on some CDBs */ 333 /* 334 * A legacy SPC-2 reservation is being held. 335 */ 336 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 337 return core_scsi2_reservation_seq_non_holder(cmd, 338 cdb, pr_reg_type); 339 340 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 341 /* 342 * Determine if the registration should be ignored due to 343 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 344 */ 345 ignore_reg = (pr_reg_type & 0x80000000); 346 if (ignore_reg) 347 pr_reg_type &= ~0x80000000; 348 349 switch (pr_reg_type) { 350 case PR_TYPE_WRITE_EXCLUSIVE: 351 we = 1; 352 case PR_TYPE_EXCLUSIVE_ACCESS: 353 /* 354 * Some commands are only allowed for the persistent reservation 355 * holder. 356 */ 357 if ((se_deve->def_pr_registered) && !(ignore_reg)) 358 registered_nexus = 1; 359 break; 360 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 361 we = 1; 362 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 363 /* 364 * Some commands are only allowed for registered I_T Nexuses. 365 */ 366 reg_only = 1; 367 if ((se_deve->def_pr_registered) && !(ignore_reg)) 368 registered_nexus = 1; 369 break; 370 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 371 we = 1; 372 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 373 /* 374 * Each registered I_T Nexus is a reservation holder. 375 */ 376 all_reg = 1; 377 if ((se_deve->def_pr_registered) && !(ignore_reg)) 378 registered_nexus = 1; 379 break; 380 default: 381 return -EINVAL; 382 } 383 /* 384 * Referenced from spc4r17 table 45 for *NON* PR holder access 385 */ 386 switch (cdb[0]) { 387 case SECURITY_PROTOCOL_IN: 388 if (registered_nexus) 389 return 0; 390 ret = (we) ? 0 : 1; 391 break; 392 case MODE_SENSE: 393 case MODE_SENSE_10: 394 case READ_ATTRIBUTE: 395 case READ_BUFFER: 396 case RECEIVE_DIAGNOSTIC: 397 if (legacy) { 398 ret = 1; 399 break; 400 } 401 if (registered_nexus) { 402 ret = 0; 403 break; 404 } 405 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 406 break; 407 case PERSISTENT_RESERVE_OUT: 408 /* 409 * This follows PERSISTENT_RESERVE_OUT service actions that 410 * are allowed in the presence of various reservations. 411 * See spc4r17, table 46 412 */ 413 switch (cdb[1] & 0x1f) { 414 case PRO_CLEAR: 415 case PRO_PREEMPT: 416 case PRO_PREEMPT_AND_ABORT: 417 ret = (registered_nexus) ? 0 : 1; 418 break; 419 case PRO_REGISTER: 420 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 421 ret = 0; 422 break; 423 case PRO_REGISTER_AND_MOVE: 424 case PRO_RESERVE: 425 ret = 1; 426 break; 427 case PRO_RELEASE: 428 ret = (registered_nexus) ? 0 : 1; 429 break; 430 default: 431 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 432 " action: 0x%02x\n", cdb[1] & 0x1f); 433 return -EINVAL; 434 } 435 break; 436 case RELEASE: 437 case RELEASE_10: 438 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 439 ret = 0; 440 break; 441 case RESERVE: 442 case RESERVE_10: 443 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 444 ret = 0; 445 break; 446 case TEST_UNIT_READY: 447 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 448 break; 449 case MAINTENANCE_IN: 450 switch (cdb[1] & 0x1f) { 451 case MI_MANAGEMENT_PROTOCOL_IN: 452 if (registered_nexus) { 453 ret = 0; 454 break; 455 } 456 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 457 break; 458 case MI_REPORT_SUPPORTED_OPERATION_CODES: 459 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 460 if (legacy) { 461 ret = 1; 462 break; 463 } 464 if (registered_nexus) { 465 ret = 0; 466 break; 467 } 468 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 469 break; 470 case MI_REPORT_ALIASES: 471 case MI_REPORT_IDENTIFYING_INFORMATION: 472 case MI_REPORT_PRIORITY: 473 case MI_REPORT_TARGET_PGS: 474 case MI_REPORT_TIMESTAMP: 475 ret = 0; /* Allowed */ 476 break; 477 default: 478 pr_err("Unknown MI Service Action: 0x%02x\n", 479 (cdb[1] & 0x1f)); 480 return -EINVAL; 481 } 482 break; 483 case ACCESS_CONTROL_IN: 484 case ACCESS_CONTROL_OUT: 485 case INQUIRY: 486 case LOG_SENSE: 487 case READ_MEDIA_SERIAL_NUMBER: 488 case REPORT_LUNS: 489 case REQUEST_SENSE: 490 case PERSISTENT_RESERVE_IN: 491 ret = 0; /*/ Allowed CDBs */ 492 break; 493 default: 494 other_cdb = 1; 495 break; 496 } 497 /* 498 * Case where the CDB is explicitly allowed in the above switch 499 * statement. 500 */ 501 if (!ret && !other_cdb) { 502 pr_debug("Allowing explict CDB: 0x%02x for %s" 503 " reservation holder\n", cdb[0], 504 core_scsi3_pr_dump_type(pr_reg_type)); 505 506 return ret; 507 } 508 /* 509 * Check if write exclusive initiator ports *NOT* holding the 510 * WRITE_EXCLUSIVE_* reservation. 511 */ 512 if (we && !registered_nexus) { 513 if (cmd->data_direction == DMA_TO_DEVICE) { 514 /* 515 * Conflict for write exclusive 516 */ 517 pr_debug("%s Conflict for unregistered nexus" 518 " %s CDB: 0x%02x to %s reservation\n", 519 transport_dump_cmd_direction(cmd), 520 se_sess->se_node_acl->initiatorname, cdb[0], 521 core_scsi3_pr_dump_type(pr_reg_type)); 522 return 1; 523 } else { 524 /* 525 * Allow non WRITE CDBs for all Write Exclusive 526 * PR TYPEs to pass for registered and 527 * non-registered_nexuxes NOT holding the reservation. 528 * 529 * We only make noise for the unregisterd nexuses, 530 * as we expect registered non-reservation holding 531 * nexuses to issue CDBs. 532 */ 533 534 if (!registered_nexus) { 535 pr_debug("Allowing implict CDB: 0x%02x" 536 " for %s reservation on unregistered" 537 " nexus\n", cdb[0], 538 core_scsi3_pr_dump_type(pr_reg_type)); 539 } 540 541 return 0; 542 } 543 } else if ((reg_only) || (all_reg)) { 544 if (registered_nexus) { 545 /* 546 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 547 * allow commands from registered nexuses. 548 */ 549 550 pr_debug("Allowing implict CDB: 0x%02x for %s" 551 " reservation\n", cdb[0], 552 core_scsi3_pr_dump_type(pr_reg_type)); 553 554 return 0; 555 } 556 } 557 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 558 " for %s reservation\n", transport_dump_cmd_direction(cmd), 559 (registered_nexus) ? "" : "un", 560 se_sess->se_node_acl->initiatorname, cdb[0], 561 core_scsi3_pr_dump_type(pr_reg_type)); 562 563 return 1; /* Conflict by default */ 564 } 565 566 static u32 core_scsi3_pr_generation(struct se_device *dev) 567 { 568 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 569 u32 prg; 570 /* 571 * PRGeneration field shall contain the value of a 32-bit wrapping 572 * counter mainted by the device server. 573 * 574 * Note that this is done regardless of Active Persist across 575 * Target PowerLoss (APTPL) 576 * 577 * See spc4r17 section 6.3.12 READ_KEYS service action 578 */ 579 spin_lock(&dev->dev_reservation_lock); 580 prg = su_dev->t10_pr.pr_generation++; 581 spin_unlock(&dev->dev_reservation_lock); 582 583 return prg; 584 } 585 586 static int core_scsi3_pr_reservation_check( 587 struct se_cmd *cmd, 588 u32 *pr_reg_type) 589 { 590 struct se_device *dev = cmd->se_dev; 591 struct se_session *sess = cmd->se_sess; 592 int ret; 593 594 if (!sess) 595 return 0; 596 /* 597 * A legacy SPC-2 reservation is being held. 598 */ 599 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 600 return core_scsi2_reservation_check(cmd, pr_reg_type); 601 602 spin_lock(&dev->dev_reservation_lock); 603 if (!dev->dev_pr_res_holder) { 604 spin_unlock(&dev->dev_reservation_lock); 605 return 0; 606 } 607 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 608 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 609 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 610 spin_unlock(&dev->dev_reservation_lock); 611 return -EINVAL; 612 } 613 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 614 spin_unlock(&dev->dev_reservation_lock); 615 return 0; 616 } 617 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 618 sess->sess_bin_isid) ? 0 : -EINVAL; 619 /* 620 * Use bit in *pr_reg_type to notify ISID mismatch in 621 * core_scsi3_pr_seq_non_holder(). 622 */ 623 if (ret != 0) 624 *pr_reg_type |= 0x80000000; 625 spin_unlock(&dev->dev_reservation_lock); 626 627 return ret; 628 } 629 630 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 631 struct se_device *dev, 632 struct se_node_acl *nacl, 633 struct se_dev_entry *deve, 634 unsigned char *isid, 635 u64 sa_res_key, 636 int all_tg_pt, 637 int aptpl) 638 { 639 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 640 struct t10_pr_registration *pr_reg; 641 642 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 643 if (!pr_reg) { 644 pr_err("Unable to allocate struct t10_pr_registration\n"); 645 return NULL; 646 } 647 648 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 649 GFP_ATOMIC); 650 if (!pr_reg->pr_aptpl_buf) { 651 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 652 kmem_cache_free(t10_pr_reg_cache, pr_reg); 653 return NULL; 654 } 655 656 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 657 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 658 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 659 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 660 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 661 atomic_set(&pr_reg->pr_res_holders, 0); 662 pr_reg->pr_reg_nacl = nacl; 663 pr_reg->pr_reg_deve = deve; 664 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 665 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 666 pr_reg->pr_res_key = sa_res_key; 667 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 668 pr_reg->pr_reg_aptpl = aptpl; 669 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 670 /* 671 * If an ISID value for this SCSI Initiator Port exists, 672 * save it to the registration now. 673 */ 674 if (isid != NULL) { 675 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 676 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 677 pr_reg->isid_present_at_reg = 1; 678 } 679 680 return pr_reg; 681 } 682 683 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 684 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 685 686 /* 687 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 688 * modes. 689 */ 690 static struct t10_pr_registration *__core_scsi3_alloc_registration( 691 struct se_device *dev, 692 struct se_node_acl *nacl, 693 struct se_dev_entry *deve, 694 unsigned char *isid, 695 u64 sa_res_key, 696 int all_tg_pt, 697 int aptpl) 698 { 699 struct se_dev_entry *deve_tmp; 700 struct se_node_acl *nacl_tmp; 701 struct se_port *port, *port_tmp; 702 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 703 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 704 int ret; 705 /* 706 * Create a registration for the I_T Nexus upon which the 707 * PROUT REGISTER was received. 708 */ 709 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 710 sa_res_key, all_tg_pt, aptpl); 711 if (!pr_reg) 712 return NULL; 713 /* 714 * Return pointer to pr_reg for ALL_TG_PT=0 715 */ 716 if (!all_tg_pt) 717 return pr_reg; 718 /* 719 * Create list of matching SCSI Initiator Port registrations 720 * for ALL_TG_PT=1 721 */ 722 spin_lock(&dev->se_port_lock); 723 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 724 atomic_inc(&port->sep_tg_pt_ref_cnt); 725 smp_mb__after_atomic_inc(); 726 spin_unlock(&dev->se_port_lock); 727 728 spin_lock_bh(&port->sep_alua_lock); 729 list_for_each_entry(deve_tmp, &port->sep_alua_list, 730 alua_port_list) { 731 /* 732 * This pointer will be NULL for demo mode MappedLUNs 733 * that have not been make explict via a ConfigFS 734 * MappedLUN group for the SCSI Initiator Node ACL. 735 */ 736 if (!deve_tmp->se_lun_acl) 737 continue; 738 739 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 740 /* 741 * Skip the matching struct se_node_acl that is allocated 742 * above.. 743 */ 744 if (nacl == nacl_tmp) 745 continue; 746 /* 747 * Only perform PR registrations for target ports on 748 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 749 * arrived. 750 */ 751 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 752 continue; 753 /* 754 * Look for a matching Initiator Node ACL in ASCII format 755 */ 756 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 757 continue; 758 759 atomic_inc(&deve_tmp->pr_ref_count); 760 smp_mb__after_atomic_inc(); 761 spin_unlock_bh(&port->sep_alua_lock); 762 /* 763 * Grab a configfs group dependency that is released 764 * for the exception path at label out: below, or upon 765 * completion of adding ALL_TG_PT=1 registrations in 766 * __core_scsi3_add_registration() 767 */ 768 ret = core_scsi3_lunacl_depend_item(deve_tmp); 769 if (ret < 0) { 770 pr_err("core_scsi3_lunacl_depend" 771 "_item() failed\n"); 772 atomic_dec(&port->sep_tg_pt_ref_cnt); 773 smp_mb__after_atomic_dec(); 774 atomic_dec(&deve_tmp->pr_ref_count); 775 smp_mb__after_atomic_dec(); 776 goto out; 777 } 778 /* 779 * Located a matching SCSI Initiator Port on a different 780 * port, allocate the pr_reg_atp and attach it to the 781 * pr_reg->pr_reg_atp_list that will be processed once 782 * the original *pr_reg is processed in 783 * __core_scsi3_add_registration() 784 */ 785 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 786 nacl_tmp, deve_tmp, NULL, 787 sa_res_key, all_tg_pt, aptpl); 788 if (!pr_reg_atp) { 789 atomic_dec(&port->sep_tg_pt_ref_cnt); 790 smp_mb__after_atomic_dec(); 791 atomic_dec(&deve_tmp->pr_ref_count); 792 smp_mb__after_atomic_dec(); 793 core_scsi3_lunacl_undepend_item(deve_tmp); 794 goto out; 795 } 796 797 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 798 &pr_reg->pr_reg_atp_list); 799 spin_lock_bh(&port->sep_alua_lock); 800 } 801 spin_unlock_bh(&port->sep_alua_lock); 802 803 spin_lock(&dev->se_port_lock); 804 atomic_dec(&port->sep_tg_pt_ref_cnt); 805 smp_mb__after_atomic_dec(); 806 } 807 spin_unlock(&dev->se_port_lock); 808 809 return pr_reg; 810 out: 811 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 812 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 813 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 814 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 815 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 816 } 817 kmem_cache_free(t10_pr_reg_cache, pr_reg); 818 return NULL; 819 } 820 821 int core_scsi3_alloc_aptpl_registration( 822 struct t10_reservation *pr_tmpl, 823 u64 sa_res_key, 824 unsigned char *i_port, 825 unsigned char *isid, 826 u32 mapped_lun, 827 unsigned char *t_port, 828 u16 tpgt, 829 u32 target_lun, 830 int res_holder, 831 int all_tg_pt, 832 u8 type) 833 { 834 struct t10_pr_registration *pr_reg; 835 836 if (!i_port || !t_port || !sa_res_key) { 837 pr_err("Illegal parameters for APTPL registration\n"); 838 return -EINVAL; 839 } 840 841 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 842 if (!pr_reg) { 843 pr_err("Unable to allocate struct t10_pr_registration\n"); 844 return -ENOMEM; 845 } 846 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 847 848 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 849 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 850 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 851 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 853 atomic_set(&pr_reg->pr_res_holders, 0); 854 pr_reg->pr_reg_nacl = NULL; 855 pr_reg->pr_reg_deve = NULL; 856 pr_reg->pr_res_mapped_lun = mapped_lun; 857 pr_reg->pr_aptpl_target_lun = target_lun; 858 pr_reg->pr_res_key = sa_res_key; 859 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 860 pr_reg->pr_reg_aptpl = 1; 861 pr_reg->pr_reg_tg_pt_lun = NULL; 862 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 863 pr_reg->pr_res_type = type; 864 /* 865 * If an ISID value had been saved in APTPL metadata for this 866 * SCSI Initiator Port, restore it now. 867 */ 868 if (isid != NULL) { 869 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 870 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 871 pr_reg->isid_present_at_reg = 1; 872 } 873 /* 874 * Copy the i_port and t_port information from caller. 875 */ 876 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 877 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 878 pr_reg->pr_reg_tpgt = tpgt; 879 /* 880 * Set pr_res_holder from caller, the pr_reg who is the reservation 881 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 882 * the Initiator Node LUN ACL from the fabric module is created for 883 * this registration. 884 */ 885 pr_reg->pr_res_holder = res_holder; 886 887 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 888 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 889 " metadata\n", (res_holder) ? "+reservation" : ""); 890 return 0; 891 } 892 893 static void core_scsi3_aptpl_reserve( 894 struct se_device *dev, 895 struct se_portal_group *tpg, 896 struct se_node_acl *node_acl, 897 struct t10_pr_registration *pr_reg) 898 { 899 char i_buf[PR_REG_ISID_ID_LEN]; 900 int prf_isid; 901 902 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 903 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 904 PR_REG_ISID_ID_LEN); 905 906 spin_lock(&dev->dev_reservation_lock); 907 dev->dev_pr_res_holder = pr_reg; 908 spin_unlock(&dev->dev_reservation_lock); 909 910 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 911 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 912 tpg->se_tpg_tfo->get_fabric_name(), 913 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 914 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 915 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 916 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 917 (prf_isid) ? &i_buf[0] : ""); 918 } 919 920 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 921 struct t10_pr_registration *, int, int); 922 923 static int __core_scsi3_check_aptpl_registration( 924 struct se_device *dev, 925 struct se_portal_group *tpg, 926 struct se_lun *lun, 927 u32 target_lun, 928 struct se_node_acl *nacl, 929 struct se_dev_entry *deve) 930 { 931 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 932 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 933 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 934 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 935 u16 tpgt; 936 937 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 938 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 939 /* 940 * Copy Initiator Port information from struct se_node_acl 941 */ 942 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 943 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 944 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 945 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 946 /* 947 * Look for the matching registrations+reservation from those 948 * created from APTPL metadata. Note that multiple registrations 949 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 950 * TransportIDs. 951 */ 952 spin_lock(&pr_tmpl->aptpl_reg_lock); 953 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 954 pr_reg_aptpl_list) { 955 if (!strcmp(pr_reg->pr_iport, i_port) && 956 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 957 !(strcmp(pr_reg->pr_tport, t_port)) && 958 (pr_reg->pr_reg_tpgt == tpgt) && 959 (pr_reg->pr_aptpl_target_lun == target_lun)) { 960 961 pr_reg->pr_reg_nacl = nacl; 962 pr_reg->pr_reg_deve = deve; 963 pr_reg->pr_reg_tg_pt_lun = lun; 964 965 list_del(&pr_reg->pr_reg_aptpl_list); 966 spin_unlock(&pr_tmpl->aptpl_reg_lock); 967 /* 968 * At this point all of the pointers in *pr_reg will 969 * be setup, so go ahead and add the registration. 970 */ 971 972 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 973 /* 974 * If this registration is the reservation holder, 975 * make that happen now.. 976 */ 977 if (pr_reg->pr_res_holder) 978 core_scsi3_aptpl_reserve(dev, tpg, 979 nacl, pr_reg); 980 /* 981 * Reenable pr_aptpl_active to accept new metadata 982 * updates once the SCSI device is active again.. 983 */ 984 spin_lock(&pr_tmpl->aptpl_reg_lock); 985 pr_tmpl->pr_aptpl_active = 1; 986 } 987 } 988 spin_unlock(&pr_tmpl->aptpl_reg_lock); 989 990 return 0; 991 } 992 993 int core_scsi3_check_aptpl_registration( 994 struct se_device *dev, 995 struct se_portal_group *tpg, 996 struct se_lun *lun, 997 struct se_lun_acl *lun_acl) 998 { 999 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1000 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 1001 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun]; 1002 1003 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 1004 return 0; 1005 1006 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1007 lun->unpacked_lun, nacl, deve); 1008 } 1009 1010 static void __core_scsi3_dump_registration( 1011 struct target_core_fabric_ops *tfo, 1012 struct se_device *dev, 1013 struct se_node_acl *nacl, 1014 struct t10_pr_registration *pr_reg, 1015 int register_type) 1016 { 1017 struct se_portal_group *se_tpg = nacl->se_tpg; 1018 char i_buf[PR_REG_ISID_ID_LEN]; 1019 int prf_isid; 1020 1021 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1022 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1023 PR_REG_ISID_ID_LEN); 1024 1025 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1026 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1027 "_AND_MOVE" : (register_type == 1) ? 1028 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1029 (prf_isid) ? i_buf : ""); 1030 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1031 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1032 tfo->tpg_get_tag(se_tpg)); 1033 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1034 " Port(s)\n", tfo->get_fabric_name(), 1035 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1036 dev->transport->name); 1037 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1038 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1039 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1040 pr_reg->pr_reg_aptpl); 1041 } 1042 1043 /* 1044 * this function can be called with struct se_device->dev_reservation_lock 1045 * when register_move = 1 1046 */ 1047 static void __core_scsi3_add_registration( 1048 struct se_device *dev, 1049 struct se_node_acl *nacl, 1050 struct t10_pr_registration *pr_reg, 1051 int register_type, 1052 int register_move) 1053 { 1054 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1055 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1056 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1057 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1058 1059 /* 1060 * Increment PRgeneration counter for struct se_device upon a successful 1061 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1062 * 1063 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1064 * action, the struct se_device->dev_reservation_lock will already be held, 1065 * so we do not call core_scsi3_pr_generation() which grabs the lock 1066 * for the REGISTER. 1067 */ 1068 pr_reg->pr_res_generation = (register_move) ? 1069 su_dev->t10_pr.pr_generation++ : 1070 core_scsi3_pr_generation(dev); 1071 1072 spin_lock(&pr_tmpl->registration_lock); 1073 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1074 pr_reg->pr_reg_deve->def_pr_registered = 1; 1075 1076 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1077 spin_unlock(&pr_tmpl->registration_lock); 1078 /* 1079 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1080 */ 1081 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1082 return; 1083 /* 1084 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1085 * allocated in __core_scsi3_alloc_registration() 1086 */ 1087 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1088 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1089 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1090 1091 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1092 1093 spin_lock(&pr_tmpl->registration_lock); 1094 list_add_tail(&pr_reg_tmp->pr_reg_list, 1095 &pr_tmpl->registration_list); 1096 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1097 1098 __core_scsi3_dump_registration(tfo, dev, 1099 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1100 register_type); 1101 spin_unlock(&pr_tmpl->registration_lock); 1102 /* 1103 * Drop configfs group dependency reference from 1104 * __core_scsi3_alloc_registration() 1105 */ 1106 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1107 } 1108 } 1109 1110 static int core_scsi3_alloc_registration( 1111 struct se_device *dev, 1112 struct se_node_acl *nacl, 1113 struct se_dev_entry *deve, 1114 unsigned char *isid, 1115 u64 sa_res_key, 1116 int all_tg_pt, 1117 int aptpl, 1118 int register_type, 1119 int register_move) 1120 { 1121 struct t10_pr_registration *pr_reg; 1122 1123 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1124 sa_res_key, all_tg_pt, aptpl); 1125 if (!pr_reg) 1126 return -EPERM; 1127 1128 __core_scsi3_add_registration(dev, nacl, pr_reg, 1129 register_type, register_move); 1130 return 0; 1131 } 1132 1133 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1134 struct se_device *dev, 1135 struct se_node_acl *nacl, 1136 unsigned char *isid) 1137 { 1138 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1139 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1140 struct se_portal_group *tpg; 1141 1142 spin_lock(&pr_tmpl->registration_lock); 1143 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1144 &pr_tmpl->registration_list, pr_reg_list) { 1145 /* 1146 * First look for a matching struct se_node_acl 1147 */ 1148 if (pr_reg->pr_reg_nacl != nacl) 1149 continue; 1150 1151 tpg = pr_reg->pr_reg_nacl->se_tpg; 1152 /* 1153 * If this registration does NOT contain a fabric provided 1154 * ISID, then we have found a match. 1155 */ 1156 if (!pr_reg->isid_present_at_reg) { 1157 /* 1158 * Determine if this SCSI device server requires that 1159 * SCSI Intiatior TransportID w/ ISIDs is enforced 1160 * for fabric modules (iSCSI) requiring them. 1161 */ 1162 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1163 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1164 continue; 1165 } 1166 atomic_inc(&pr_reg->pr_res_holders); 1167 smp_mb__after_atomic_inc(); 1168 spin_unlock(&pr_tmpl->registration_lock); 1169 return pr_reg; 1170 } 1171 /* 1172 * If the *pr_reg contains a fabric defined ISID for multi-value 1173 * SCSI Initiator Port TransportIDs, then we expect a valid 1174 * matching ISID to be provided by the local SCSI Initiator Port. 1175 */ 1176 if (!isid) 1177 continue; 1178 if (strcmp(isid, pr_reg->pr_reg_isid)) 1179 continue; 1180 1181 atomic_inc(&pr_reg->pr_res_holders); 1182 smp_mb__after_atomic_inc(); 1183 spin_unlock(&pr_tmpl->registration_lock); 1184 return pr_reg; 1185 } 1186 spin_unlock(&pr_tmpl->registration_lock); 1187 1188 return NULL; 1189 } 1190 1191 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1192 struct se_device *dev, 1193 struct se_node_acl *nacl, 1194 struct se_session *sess) 1195 { 1196 struct se_portal_group *tpg = nacl->se_tpg; 1197 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1198 1199 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1200 memset(&buf[0], 0, PR_REG_ISID_LEN); 1201 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1202 PR_REG_ISID_LEN); 1203 isid_ptr = &buf[0]; 1204 } 1205 1206 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1207 } 1208 1209 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1210 { 1211 atomic_dec(&pr_reg->pr_res_holders); 1212 smp_mb__after_atomic_dec(); 1213 } 1214 1215 static int core_scsi3_check_implict_release( 1216 struct se_device *dev, 1217 struct t10_pr_registration *pr_reg) 1218 { 1219 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1220 struct t10_pr_registration *pr_res_holder; 1221 int ret = 0; 1222 1223 spin_lock(&dev->dev_reservation_lock); 1224 pr_res_holder = dev->dev_pr_res_holder; 1225 if (!pr_res_holder) { 1226 spin_unlock(&dev->dev_reservation_lock); 1227 return ret; 1228 } 1229 if (pr_res_holder == pr_reg) { 1230 /* 1231 * Perform an implict RELEASE if the registration that 1232 * is being released is holding the reservation. 1233 * 1234 * From spc4r17, section 5.7.11.1: 1235 * 1236 * e) If the I_T nexus is the persistent reservation holder 1237 * and the persistent reservation is not an all registrants 1238 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1239 * service action or REGISTER AND IGNORE EXISTING KEY 1240 * service action with the SERVICE ACTION RESERVATION KEY 1241 * field set to zero (see 5.7.11.3). 1242 */ 1243 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1244 ret = 1; 1245 /* 1246 * For 'All Registrants' reservation types, all existing 1247 * registrations are still processed as reservation holders 1248 * in core_scsi3_pr_seq_non_holder() after the initial 1249 * reservation holder is implictly released here. 1250 */ 1251 } else if (pr_reg->pr_reg_all_tg_pt && 1252 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1253 pr_reg->pr_reg_nacl->initiatorname)) && 1254 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1255 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1256 " UNREGISTER while existing reservation with matching" 1257 " key 0x%016Lx is present from another SCSI Initiator" 1258 " Port\n", pr_reg->pr_res_key); 1259 ret = -EPERM; 1260 } 1261 spin_unlock(&dev->dev_reservation_lock); 1262 1263 return ret; 1264 } 1265 1266 /* 1267 * Called with struct t10_reservation->registration_lock held. 1268 */ 1269 static void __core_scsi3_free_registration( 1270 struct se_device *dev, 1271 struct t10_pr_registration *pr_reg, 1272 struct list_head *preempt_and_abort_list, 1273 int dec_holders) 1274 { 1275 struct target_core_fabric_ops *tfo = 1276 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1277 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1278 char i_buf[PR_REG_ISID_ID_LEN]; 1279 int prf_isid; 1280 1281 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1282 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1283 PR_REG_ISID_ID_LEN); 1284 1285 pr_reg->pr_reg_deve->def_pr_registered = 0; 1286 pr_reg->pr_reg_deve->pr_res_key = 0; 1287 list_del(&pr_reg->pr_reg_list); 1288 /* 1289 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1290 * so call core_scsi3_put_pr_reg() to decrement our reference. 1291 */ 1292 if (dec_holders) 1293 core_scsi3_put_pr_reg(pr_reg); 1294 /* 1295 * Wait until all reference from any other I_T nexuses for this 1296 * *pr_reg have been released. Because list_del() is called above, 1297 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1298 * count back to zero, and we release *pr_reg. 1299 */ 1300 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1301 spin_unlock(&pr_tmpl->registration_lock); 1302 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1303 tfo->get_fabric_name()); 1304 cpu_relax(); 1305 spin_lock(&pr_tmpl->registration_lock); 1306 } 1307 1308 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1309 " Node: %s%s\n", tfo->get_fabric_name(), 1310 pr_reg->pr_reg_nacl->initiatorname, 1311 (prf_isid) ? &i_buf[0] : ""); 1312 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1313 " Port(s)\n", tfo->get_fabric_name(), 1314 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1315 dev->transport->name); 1316 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1317 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1318 pr_reg->pr_res_generation); 1319 1320 if (!preempt_and_abort_list) { 1321 pr_reg->pr_reg_deve = NULL; 1322 pr_reg->pr_reg_nacl = NULL; 1323 kfree(pr_reg->pr_aptpl_buf); 1324 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1325 return; 1326 } 1327 /* 1328 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1329 * are released once the ABORT_TASK_SET has completed.. 1330 */ 1331 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1332 } 1333 1334 void core_scsi3_free_pr_reg_from_nacl( 1335 struct se_device *dev, 1336 struct se_node_acl *nacl) 1337 { 1338 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1339 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1340 /* 1341 * If the passed se_node_acl matches the reservation holder, 1342 * release the reservation. 1343 */ 1344 spin_lock(&dev->dev_reservation_lock); 1345 pr_res_holder = dev->dev_pr_res_holder; 1346 if ((pr_res_holder != NULL) && 1347 (pr_res_holder->pr_reg_nacl == nacl)) 1348 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1349 spin_unlock(&dev->dev_reservation_lock); 1350 /* 1351 * Release any registration associated with the struct se_node_acl. 1352 */ 1353 spin_lock(&pr_tmpl->registration_lock); 1354 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1355 &pr_tmpl->registration_list, pr_reg_list) { 1356 1357 if (pr_reg->pr_reg_nacl != nacl) 1358 continue; 1359 1360 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1361 } 1362 spin_unlock(&pr_tmpl->registration_lock); 1363 } 1364 1365 void core_scsi3_free_all_registrations( 1366 struct se_device *dev) 1367 { 1368 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1369 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1370 1371 spin_lock(&dev->dev_reservation_lock); 1372 pr_res_holder = dev->dev_pr_res_holder; 1373 if (pr_res_holder != NULL) { 1374 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1375 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1376 pr_res_holder, 0); 1377 } 1378 spin_unlock(&dev->dev_reservation_lock); 1379 1380 spin_lock(&pr_tmpl->registration_lock); 1381 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1382 &pr_tmpl->registration_list, pr_reg_list) { 1383 1384 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1385 } 1386 spin_unlock(&pr_tmpl->registration_lock); 1387 1388 spin_lock(&pr_tmpl->aptpl_reg_lock); 1389 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1390 pr_reg_aptpl_list) { 1391 list_del(&pr_reg->pr_reg_aptpl_list); 1392 kfree(pr_reg->pr_aptpl_buf); 1393 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1394 } 1395 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1396 } 1397 1398 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1399 { 1400 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1401 &tpg->tpg_group.cg_item); 1402 } 1403 1404 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1405 { 1406 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1407 &tpg->tpg_group.cg_item); 1408 1409 atomic_dec(&tpg->tpg_pr_ref_count); 1410 smp_mb__after_atomic_dec(); 1411 } 1412 1413 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1414 { 1415 struct se_portal_group *tpg = nacl->se_tpg; 1416 1417 if (nacl->dynamic_node_acl) 1418 return 0; 1419 1420 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1421 &nacl->acl_group.cg_item); 1422 } 1423 1424 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1425 { 1426 struct se_portal_group *tpg = nacl->se_tpg; 1427 1428 if (nacl->dynamic_node_acl) { 1429 atomic_dec(&nacl->acl_pr_ref_count); 1430 smp_mb__after_atomic_dec(); 1431 return; 1432 } 1433 1434 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1435 &nacl->acl_group.cg_item); 1436 1437 atomic_dec(&nacl->acl_pr_ref_count); 1438 smp_mb__after_atomic_dec(); 1439 } 1440 1441 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1442 { 1443 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1444 struct se_node_acl *nacl; 1445 struct se_portal_group *tpg; 1446 /* 1447 * For nacl->dynamic_node_acl=1 1448 */ 1449 if (!lun_acl) 1450 return 0; 1451 1452 nacl = lun_acl->se_lun_nacl; 1453 tpg = nacl->se_tpg; 1454 1455 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1456 &lun_acl->se_lun_group.cg_item); 1457 } 1458 1459 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1460 { 1461 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1462 struct se_node_acl *nacl; 1463 struct se_portal_group *tpg; 1464 /* 1465 * For nacl->dynamic_node_acl=1 1466 */ 1467 if (!lun_acl) { 1468 atomic_dec(&se_deve->pr_ref_count); 1469 smp_mb__after_atomic_dec(); 1470 return; 1471 } 1472 nacl = lun_acl->se_lun_nacl; 1473 tpg = nacl->se_tpg; 1474 1475 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1476 &lun_acl->se_lun_group.cg_item); 1477 1478 atomic_dec(&se_deve->pr_ref_count); 1479 smp_mb__after_atomic_dec(); 1480 } 1481 1482 static int core_scsi3_decode_spec_i_port( 1483 struct se_cmd *cmd, 1484 struct se_portal_group *tpg, 1485 unsigned char *l_isid, 1486 u64 sa_res_key, 1487 int all_tg_pt, 1488 int aptpl) 1489 { 1490 struct se_device *dev = cmd->se_dev; 1491 struct se_port *tmp_port; 1492 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1493 struct se_session *se_sess = cmd->se_sess; 1494 struct se_node_acl *dest_node_acl = NULL; 1495 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1496 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1497 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1498 LIST_HEAD(tid_dest_list); 1499 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1500 struct target_core_fabric_ops *tmp_tf_ops; 1501 unsigned char *buf; 1502 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1503 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1504 u32 tpdl, tid_len = 0; 1505 int ret, dest_local_nexus, prf_isid; 1506 u32 dest_rtpi = 0; 1507 1508 memset(dest_iport, 0, 64); 1509 1510 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1511 /* 1512 * Allocate a struct pr_transport_id_holder and setup the 1513 * local_node_acl and local_se_deve pointers and add to 1514 * struct list_head tid_dest_list for add registration 1515 * processing in the loop of tid_dest_list below. 1516 */ 1517 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1518 if (!tidh_new) { 1519 pr_err("Unable to allocate tidh_new\n"); 1520 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1521 return -EINVAL; 1522 } 1523 INIT_LIST_HEAD(&tidh_new->dest_list); 1524 tidh_new->dest_tpg = tpg; 1525 tidh_new->dest_node_acl = se_sess->se_node_acl; 1526 tidh_new->dest_se_deve = local_se_deve; 1527 1528 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1529 se_sess->se_node_acl, local_se_deve, l_isid, 1530 sa_res_key, all_tg_pt, aptpl); 1531 if (!local_pr_reg) { 1532 kfree(tidh_new); 1533 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1534 return -ENOMEM; 1535 } 1536 tidh_new->dest_pr_reg = local_pr_reg; 1537 /* 1538 * The local I_T nexus does not hold any configfs dependances, 1539 * so we set tid_h->dest_local_nexus=1 to prevent the 1540 * configfs_undepend_item() calls in the tid_dest_list loops below. 1541 */ 1542 tidh_new->dest_local_nexus = 1; 1543 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1544 1545 if (cmd->data_length < 28) { 1546 pr_warn("SPC-PR: Received PR OUT parameter list" 1547 " length too small: %u\n", cmd->data_length); 1548 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1549 ret = -EINVAL; 1550 goto out; 1551 } 1552 1553 buf = transport_kmap_data_sg(cmd); 1554 /* 1555 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1556 * first extract TransportID Parameter Data Length, and make sure 1557 * the value matches up to the SCSI expected data transfer length. 1558 */ 1559 tpdl = (buf[24] & 0xff) << 24; 1560 tpdl |= (buf[25] & 0xff) << 16; 1561 tpdl |= (buf[26] & 0xff) << 8; 1562 tpdl |= buf[27] & 0xff; 1563 1564 if ((tpdl + 28) != cmd->data_length) { 1565 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1566 " does not equal CDB data_length: %u\n", tpdl, 1567 cmd->data_length); 1568 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1569 ret = -EINVAL; 1570 goto out; 1571 } 1572 /* 1573 * Start processing the received transport IDs using the 1574 * receiving I_T Nexus portal's fabric dependent methods to 1575 * obtain the SCSI Initiator Port/Device Identifiers. 1576 */ 1577 ptr = &buf[28]; 1578 1579 while (tpdl > 0) { 1580 proto_ident = (ptr[0] & 0x0f); 1581 dest_tpg = NULL; 1582 1583 spin_lock(&dev->se_port_lock); 1584 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1585 tmp_tpg = tmp_port->sep_tpg; 1586 if (!tmp_tpg) 1587 continue; 1588 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1589 if (!tmp_tf_ops) 1590 continue; 1591 if (!tmp_tf_ops->get_fabric_proto_ident || 1592 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1593 continue; 1594 /* 1595 * Look for the matching proto_ident provided by 1596 * the received TransportID 1597 */ 1598 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1599 if (tmp_proto_ident != proto_ident) 1600 continue; 1601 dest_rtpi = tmp_port->sep_rtpi; 1602 1603 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1604 tmp_tpg, (const char *)ptr, &tid_len, 1605 &iport_ptr); 1606 if (!i_str) 1607 continue; 1608 1609 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1610 smp_mb__after_atomic_inc(); 1611 spin_unlock(&dev->se_port_lock); 1612 1613 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1614 if (ret != 0) { 1615 pr_err(" core_scsi3_tpg_depend_item()" 1616 " for tmp_tpg\n"); 1617 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1618 smp_mb__after_atomic_dec(); 1619 cmd->scsi_sense_reason = 1620 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1621 ret = -EINVAL; 1622 goto out; 1623 } 1624 /* 1625 * Locate the destination initiator ACL to be registered 1626 * from the decoded fabric module specific TransportID 1627 * at *i_str. 1628 */ 1629 spin_lock_irq(&tmp_tpg->acl_node_lock); 1630 dest_node_acl = __core_tpg_get_initiator_node_acl( 1631 tmp_tpg, i_str); 1632 if (dest_node_acl) { 1633 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1634 smp_mb__after_atomic_inc(); 1635 } 1636 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1637 1638 if (!dest_node_acl) { 1639 core_scsi3_tpg_undepend_item(tmp_tpg); 1640 spin_lock(&dev->se_port_lock); 1641 continue; 1642 } 1643 1644 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1645 if (ret != 0) { 1646 pr_err("configfs_depend_item() failed" 1647 " for dest_node_acl->acl_group\n"); 1648 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1649 smp_mb__after_atomic_dec(); 1650 core_scsi3_tpg_undepend_item(tmp_tpg); 1651 cmd->scsi_sense_reason = 1652 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1653 ret = -EINVAL; 1654 goto out; 1655 } 1656 1657 dest_tpg = tmp_tpg; 1658 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1659 " %s Port RTPI: %hu\n", 1660 dest_tpg->se_tpg_tfo->get_fabric_name(), 1661 dest_node_acl->initiatorname, dest_rtpi); 1662 1663 spin_lock(&dev->se_port_lock); 1664 break; 1665 } 1666 spin_unlock(&dev->se_port_lock); 1667 1668 if (!dest_tpg) { 1669 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1670 " dest_tpg\n"); 1671 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1672 ret = -EINVAL; 1673 goto out; 1674 } 1675 1676 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1677 " tid_len: %d for %s + %s\n", 1678 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1679 tpdl, tid_len, i_str, iport_ptr); 1680 1681 if (tid_len > tpdl) { 1682 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1683 " %u for Transport ID: %s\n", tid_len, ptr); 1684 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1685 core_scsi3_tpg_undepend_item(dest_tpg); 1686 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1687 ret = -EINVAL; 1688 goto out; 1689 } 1690 /* 1691 * Locate the desintation struct se_dev_entry pointer for matching 1692 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1693 * Target Port. 1694 */ 1695 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1696 dest_rtpi); 1697 if (!dest_se_deve) { 1698 pr_err("Unable to locate %s dest_se_deve" 1699 " from destination RTPI: %hu\n", 1700 dest_tpg->se_tpg_tfo->get_fabric_name(), 1701 dest_rtpi); 1702 1703 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1704 core_scsi3_tpg_undepend_item(dest_tpg); 1705 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1706 ret = -EINVAL; 1707 goto out; 1708 } 1709 1710 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1711 if (ret < 0) { 1712 pr_err("core_scsi3_lunacl_depend_item()" 1713 " failed\n"); 1714 atomic_dec(&dest_se_deve->pr_ref_count); 1715 smp_mb__after_atomic_dec(); 1716 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1717 core_scsi3_tpg_undepend_item(dest_tpg); 1718 cmd->scsi_sense_reason = 1719 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1720 ret = -EINVAL; 1721 goto out; 1722 } 1723 1724 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1725 " dest_se_deve mapped_lun: %u\n", 1726 dest_tpg->se_tpg_tfo->get_fabric_name(), 1727 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1728 1729 /* 1730 * Skip any TransportIDs that already have a registration for 1731 * this target port. 1732 */ 1733 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1734 iport_ptr); 1735 if (pr_reg_e) { 1736 core_scsi3_put_pr_reg(pr_reg_e); 1737 core_scsi3_lunacl_undepend_item(dest_se_deve); 1738 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1739 core_scsi3_tpg_undepend_item(dest_tpg); 1740 ptr += tid_len; 1741 tpdl -= tid_len; 1742 tid_len = 0; 1743 continue; 1744 } 1745 /* 1746 * Allocate a struct pr_transport_id_holder and setup 1747 * the dest_node_acl and dest_se_deve pointers for the 1748 * loop below. 1749 */ 1750 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1751 GFP_KERNEL); 1752 if (!tidh_new) { 1753 pr_err("Unable to allocate tidh_new\n"); 1754 core_scsi3_lunacl_undepend_item(dest_se_deve); 1755 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1756 core_scsi3_tpg_undepend_item(dest_tpg); 1757 cmd->scsi_sense_reason = 1758 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1759 ret = -ENOMEM; 1760 goto out; 1761 } 1762 INIT_LIST_HEAD(&tidh_new->dest_list); 1763 tidh_new->dest_tpg = dest_tpg; 1764 tidh_new->dest_node_acl = dest_node_acl; 1765 tidh_new->dest_se_deve = dest_se_deve; 1766 1767 /* 1768 * Allocate, but do NOT add the registration for the 1769 * TransportID referenced SCSI Initiator port. This 1770 * done because of the following from spc4r17 in section 1771 * 6.14.3 wrt SPEC_I_PT: 1772 * 1773 * "If a registration fails for any initiator port (e.g., if th 1774 * logical unit does not have enough resources available to 1775 * hold the registration information), no registrations shall be 1776 * made, and the command shall be terminated with 1777 * CHECK CONDITION status." 1778 * 1779 * That means we call __core_scsi3_alloc_registration() here, 1780 * and then call __core_scsi3_add_registration() in the 1781 * 2nd loop which will never fail. 1782 */ 1783 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1784 dest_node_acl, dest_se_deve, iport_ptr, 1785 sa_res_key, all_tg_pt, aptpl); 1786 if (!dest_pr_reg) { 1787 core_scsi3_lunacl_undepend_item(dest_se_deve); 1788 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1789 core_scsi3_tpg_undepend_item(dest_tpg); 1790 kfree(tidh_new); 1791 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 tidh_new->dest_pr_reg = dest_pr_reg; 1796 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1797 1798 ptr += tid_len; 1799 tpdl -= tid_len; 1800 tid_len = 0; 1801 1802 } 1803 1804 transport_kunmap_data_sg(cmd); 1805 1806 /* 1807 * Go ahead and create a registrations from tid_dest_list for the 1808 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1809 * and dest_se_deve. 1810 * 1811 * The SA Reservation Key from the PROUT is set for the 1812 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1813 * means that the TransportID Initiator port will be 1814 * registered on all of the target ports in the SCSI target device 1815 * ALL_TG_PT=0 means the registration will only be for the 1816 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1817 * was received. 1818 */ 1819 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1820 dest_tpg = tidh->dest_tpg; 1821 dest_node_acl = tidh->dest_node_acl; 1822 dest_se_deve = tidh->dest_se_deve; 1823 dest_pr_reg = tidh->dest_pr_reg; 1824 dest_local_nexus = tidh->dest_local_nexus; 1825 1826 list_del(&tidh->dest_list); 1827 kfree(tidh); 1828 1829 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1830 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1831 PR_REG_ISID_ID_LEN); 1832 1833 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1834 dest_pr_reg, 0, 0); 1835 1836 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1837 " registered Transport ID for Node: %s%s Mapped LUN:" 1838 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1839 dest_node_acl->initiatorname, (prf_isid) ? 1840 &i_buf[0] : "", dest_se_deve->mapped_lun); 1841 1842 if (dest_local_nexus) 1843 continue; 1844 1845 core_scsi3_lunacl_undepend_item(dest_se_deve); 1846 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1847 core_scsi3_tpg_undepend_item(dest_tpg); 1848 } 1849 1850 return 0; 1851 out: 1852 transport_kunmap_data_sg(cmd); 1853 /* 1854 * For the failure case, release everything from tid_dest_list 1855 * including *dest_pr_reg and the configfs dependances.. 1856 */ 1857 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1858 dest_tpg = tidh->dest_tpg; 1859 dest_node_acl = tidh->dest_node_acl; 1860 dest_se_deve = tidh->dest_se_deve; 1861 dest_pr_reg = tidh->dest_pr_reg; 1862 dest_local_nexus = tidh->dest_local_nexus; 1863 1864 list_del(&tidh->dest_list); 1865 kfree(tidh); 1866 /* 1867 * Release any extra ALL_TG_PT=1 registrations for 1868 * the SPEC_I_PT=1 case. 1869 */ 1870 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1871 &dest_pr_reg->pr_reg_atp_list, 1872 pr_reg_atp_mem_list) { 1873 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1874 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1875 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1876 } 1877 1878 kfree(dest_pr_reg->pr_aptpl_buf); 1879 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1880 1881 if (dest_local_nexus) 1882 continue; 1883 1884 core_scsi3_lunacl_undepend_item(dest_se_deve); 1885 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1886 core_scsi3_tpg_undepend_item(dest_tpg); 1887 } 1888 return ret; 1889 } 1890 1891 /* 1892 * Called with struct se_device->dev_reservation_lock held 1893 */ 1894 static int __core_scsi3_update_aptpl_buf( 1895 struct se_device *dev, 1896 unsigned char *buf, 1897 u32 pr_aptpl_buf_len, 1898 int clear_aptpl_metadata) 1899 { 1900 struct se_lun *lun; 1901 struct se_portal_group *tpg; 1902 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1903 struct t10_pr_registration *pr_reg; 1904 unsigned char tmp[512], isid_buf[32]; 1905 ssize_t len = 0; 1906 int reg_count = 0; 1907 1908 memset(buf, 0, pr_aptpl_buf_len); 1909 /* 1910 * Called to clear metadata once APTPL has been deactivated. 1911 */ 1912 if (clear_aptpl_metadata) { 1913 snprintf(buf, pr_aptpl_buf_len, 1914 "No Registrations or Reservations\n"); 1915 return 0; 1916 } 1917 /* 1918 * Walk the registration list.. 1919 */ 1920 spin_lock(&su_dev->t10_pr.registration_lock); 1921 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1922 pr_reg_list) { 1923 1924 tmp[0] = '\0'; 1925 isid_buf[0] = '\0'; 1926 tpg = pr_reg->pr_reg_nacl->se_tpg; 1927 lun = pr_reg->pr_reg_tg_pt_lun; 1928 /* 1929 * Write out any ISID value to APTPL metadata that was included 1930 * in the original registration. 1931 */ 1932 if (pr_reg->isid_present_at_reg) 1933 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1934 pr_reg->pr_reg_isid); 1935 /* 1936 * Include special metadata if the pr_reg matches the 1937 * reservation holder. 1938 */ 1939 if (dev->dev_pr_res_holder == pr_reg) { 1940 snprintf(tmp, 512, "PR_REG_START: %d" 1941 "\ninitiator_fabric=%s\n" 1942 "initiator_node=%s\n%s" 1943 "sa_res_key=%llu\n" 1944 "res_holder=1\nres_type=%02x\n" 1945 "res_scope=%02x\nres_all_tg_pt=%d\n" 1946 "mapped_lun=%u\n", reg_count, 1947 tpg->se_tpg_tfo->get_fabric_name(), 1948 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1949 pr_reg->pr_res_key, pr_reg->pr_res_type, 1950 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1951 pr_reg->pr_res_mapped_lun); 1952 } else { 1953 snprintf(tmp, 512, "PR_REG_START: %d\n" 1954 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1955 "sa_res_key=%llu\nres_holder=0\n" 1956 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1957 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1958 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1959 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1960 pr_reg->pr_res_mapped_lun); 1961 } 1962 1963 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1964 pr_err("Unable to update renaming" 1965 " APTPL metadata\n"); 1966 spin_unlock(&su_dev->t10_pr.registration_lock); 1967 return -EMSGSIZE; 1968 } 1969 len += sprintf(buf+len, "%s", tmp); 1970 1971 /* 1972 * Include information about the associated SCSI target port. 1973 */ 1974 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1975 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1976 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1977 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1978 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1979 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1980 1981 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1982 pr_err("Unable to update renaming" 1983 " APTPL metadata\n"); 1984 spin_unlock(&su_dev->t10_pr.registration_lock); 1985 return -EMSGSIZE; 1986 } 1987 len += sprintf(buf+len, "%s", tmp); 1988 reg_count++; 1989 } 1990 spin_unlock(&su_dev->t10_pr.registration_lock); 1991 1992 if (!reg_count) 1993 len += sprintf(buf+len, "No Registrations or Reservations"); 1994 1995 return 0; 1996 } 1997 1998 static int core_scsi3_update_aptpl_buf( 1999 struct se_device *dev, 2000 unsigned char *buf, 2001 u32 pr_aptpl_buf_len, 2002 int clear_aptpl_metadata) 2003 { 2004 int ret; 2005 2006 spin_lock(&dev->dev_reservation_lock); 2007 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2008 clear_aptpl_metadata); 2009 spin_unlock(&dev->dev_reservation_lock); 2010 2011 return ret; 2012 } 2013 2014 /* 2015 * Called with struct se_device->aptpl_file_mutex held 2016 */ 2017 static int __core_scsi3_write_aptpl_to_file( 2018 struct se_device *dev, 2019 unsigned char *buf, 2020 u32 pr_aptpl_buf_len) 2021 { 2022 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2023 struct file *file; 2024 struct iovec iov[1]; 2025 mm_segment_t old_fs; 2026 int flags = O_RDWR | O_CREAT | O_TRUNC; 2027 char path[512]; 2028 int ret; 2029 2030 memset(iov, 0, sizeof(struct iovec)); 2031 memset(path, 0, 512); 2032 2033 if (strlen(&wwn->unit_serial[0]) >= 512) { 2034 pr_err("WWN value for struct se_device does not fit" 2035 " into path buffer\n"); 2036 return -EMSGSIZE; 2037 } 2038 2039 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2040 file = filp_open(path, flags, 0600); 2041 if (IS_ERR(file) || !file || !file->f_dentry) { 2042 pr_err("filp_open(%s) for APTPL metadata" 2043 " failed\n", path); 2044 return IS_ERR(file) ? PTR_ERR(file) : -ENOENT; 2045 } 2046 2047 iov[0].iov_base = &buf[0]; 2048 if (!pr_aptpl_buf_len) 2049 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2050 else 2051 iov[0].iov_len = pr_aptpl_buf_len; 2052 2053 old_fs = get_fs(); 2054 set_fs(get_ds()); 2055 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2056 set_fs(old_fs); 2057 2058 if (ret < 0) { 2059 pr_debug("Error writing APTPL metadata file: %s\n", path); 2060 filp_close(file, NULL); 2061 return -EIO; 2062 } 2063 filp_close(file, NULL); 2064 2065 return 0; 2066 } 2067 2068 static int core_scsi3_update_and_write_aptpl( 2069 struct se_device *dev, 2070 unsigned char *in_buf, 2071 u32 in_pr_aptpl_buf_len) 2072 { 2073 unsigned char null_buf[64], *buf; 2074 u32 pr_aptpl_buf_len; 2075 int ret, clear_aptpl_metadata = 0; 2076 /* 2077 * Can be called with a NULL pointer from PROUT service action CLEAR 2078 */ 2079 if (!in_buf) { 2080 memset(null_buf, 0, 64); 2081 buf = &null_buf[0]; 2082 /* 2083 * This will clear the APTPL metadata to: 2084 * "No Registrations or Reservations" status 2085 */ 2086 pr_aptpl_buf_len = 64; 2087 clear_aptpl_metadata = 1; 2088 } else { 2089 buf = in_buf; 2090 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2091 } 2092 2093 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2094 clear_aptpl_metadata); 2095 if (ret != 0) 2096 return ret; 2097 /* 2098 * __core_scsi3_write_aptpl_to_file() will call strlen() 2099 * on the passed buf to determine pr_aptpl_buf_len. 2100 */ 2101 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2102 if (ret != 0) 2103 return ret; 2104 2105 return ret; 2106 } 2107 2108 static int core_scsi3_emulate_pro_register( 2109 struct se_cmd *cmd, 2110 u64 res_key, 2111 u64 sa_res_key, 2112 int aptpl, 2113 int all_tg_pt, 2114 int spec_i_pt, 2115 int ignore_key) 2116 { 2117 struct se_session *se_sess = cmd->se_sess; 2118 struct se_device *dev = cmd->se_dev; 2119 struct se_dev_entry *se_deve; 2120 struct se_lun *se_lun = cmd->se_lun; 2121 struct se_portal_group *se_tpg; 2122 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2123 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2124 /* Used for APTPL metadata w/ UNREGISTER */ 2125 unsigned char *pr_aptpl_buf = NULL; 2126 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2127 int pr_holder = 0, ret = 0, type; 2128 2129 if (!se_sess || !se_lun) { 2130 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2131 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2132 return -EINVAL; 2133 } 2134 se_tpg = se_sess->se_tpg; 2135 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2136 2137 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2138 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2139 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2140 PR_REG_ISID_LEN); 2141 isid_ptr = &isid_buf[0]; 2142 } 2143 /* 2144 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2145 */ 2146 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2147 if (!pr_reg_e) { 2148 if (res_key) { 2149 pr_warn("SPC-3 PR: Reservation Key non-zero" 2150 " for SA REGISTER, returning CONFLICT\n"); 2151 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2152 return -EINVAL; 2153 } 2154 /* 2155 * Do nothing but return GOOD status. 2156 */ 2157 if (!sa_res_key) 2158 return 0; 2159 2160 if (!spec_i_pt) { 2161 /* 2162 * Perform the Service Action REGISTER on the Initiator 2163 * Port Endpoint that the PRO was received from on the 2164 * Logical Unit of the SCSI device server. 2165 */ 2166 ret = core_scsi3_alloc_registration(cmd->se_dev, 2167 se_sess->se_node_acl, se_deve, isid_ptr, 2168 sa_res_key, all_tg_pt, aptpl, 2169 ignore_key, 0); 2170 if (ret != 0) { 2171 pr_err("Unable to allocate" 2172 " struct t10_pr_registration\n"); 2173 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2174 return -EINVAL; 2175 } 2176 } else { 2177 /* 2178 * Register both the Initiator port that received 2179 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2180 * TransportID from Parameter list and loop through 2181 * fabric dependent parameter list while calling 2182 * logic from of core_scsi3_alloc_registration() for 2183 * each TransportID provided SCSI Initiator Port/Device 2184 */ 2185 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2186 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2187 if (ret != 0) 2188 return ret; 2189 } 2190 /* 2191 * Nothing left to do for the APTPL=0 case. 2192 */ 2193 if (!aptpl) { 2194 pr_tmpl->pr_aptpl_active = 0; 2195 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2196 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2197 " REGISTER\n"); 2198 return 0; 2199 } 2200 /* 2201 * Locate the newly allocated local I_T Nexus *pr_reg, and 2202 * update the APTPL metadata information using its 2203 * preallocated *pr_reg->pr_aptpl_buf. 2204 */ 2205 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2206 se_sess->se_node_acl, se_sess); 2207 2208 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2209 &pr_reg->pr_aptpl_buf[0], 2210 pr_tmpl->pr_aptpl_buf_len); 2211 if (!ret) { 2212 pr_tmpl->pr_aptpl_active = 1; 2213 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2214 } 2215 2216 core_scsi3_put_pr_reg(pr_reg); 2217 return ret; 2218 } else { 2219 /* 2220 * Locate the existing *pr_reg via struct se_node_acl pointers 2221 */ 2222 pr_reg = pr_reg_e; 2223 type = pr_reg->pr_res_type; 2224 2225 if (!ignore_key) { 2226 if (res_key != pr_reg->pr_res_key) { 2227 pr_err("SPC-3 PR REGISTER: Received" 2228 " res_key: 0x%016Lx does not match" 2229 " existing SA REGISTER res_key:" 2230 " 0x%016Lx\n", res_key, 2231 pr_reg->pr_res_key); 2232 core_scsi3_put_pr_reg(pr_reg); 2233 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2234 return -EINVAL; 2235 } 2236 } 2237 if (spec_i_pt) { 2238 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2239 " set while sa_res_key=0\n"); 2240 core_scsi3_put_pr_reg(pr_reg); 2241 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2242 return -EINVAL; 2243 } 2244 /* 2245 * An existing ALL_TG_PT=1 registration being released 2246 * must also set ALL_TG_PT=1 in the incoming PROUT. 2247 */ 2248 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2249 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2250 " registration exists, but ALL_TG_PT=1 bit not" 2251 " present in received PROUT\n"); 2252 core_scsi3_put_pr_reg(pr_reg); 2253 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2254 return -EINVAL; 2255 } 2256 /* 2257 * Allocate APTPL metadata buffer used for UNREGISTER ops 2258 */ 2259 if (aptpl) { 2260 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2261 GFP_KERNEL); 2262 if (!pr_aptpl_buf) { 2263 pr_err("Unable to allocate" 2264 " pr_aptpl_buf\n"); 2265 core_scsi3_put_pr_reg(pr_reg); 2266 cmd->scsi_sense_reason = 2267 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2268 return -EINVAL; 2269 } 2270 } 2271 /* 2272 * sa_res_key=0 Unregister Reservation Key for registered I_T 2273 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2274 * Nexus. 2275 */ 2276 if (!sa_res_key) { 2277 pr_holder = core_scsi3_check_implict_release( 2278 cmd->se_dev, pr_reg); 2279 if (pr_holder < 0) { 2280 kfree(pr_aptpl_buf); 2281 core_scsi3_put_pr_reg(pr_reg); 2282 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2283 return -EINVAL; 2284 } 2285 2286 spin_lock(&pr_tmpl->registration_lock); 2287 /* 2288 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2289 * and matching pr_res_key. 2290 */ 2291 if (pr_reg->pr_reg_all_tg_pt) { 2292 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2293 &pr_tmpl->registration_list, 2294 pr_reg_list) { 2295 2296 if (!pr_reg_p->pr_reg_all_tg_pt) 2297 continue; 2298 2299 if (pr_reg_p->pr_res_key != res_key) 2300 continue; 2301 2302 if (pr_reg == pr_reg_p) 2303 continue; 2304 2305 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2306 pr_reg_p->pr_reg_nacl->initiatorname)) 2307 continue; 2308 2309 __core_scsi3_free_registration(dev, 2310 pr_reg_p, NULL, 0); 2311 } 2312 } 2313 /* 2314 * Release the calling I_T Nexus registration now.. 2315 */ 2316 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2317 NULL, 1); 2318 /* 2319 * From spc4r17, section 5.7.11.3 Unregistering 2320 * 2321 * If the persistent reservation is a registrants only 2322 * type, the device server shall establish a unit 2323 * attention condition for the initiator port associated 2324 * with every registered I_T nexus except for the I_T 2325 * nexus on which the PERSISTENT RESERVE OUT command was 2326 * received, with the additional sense code set to 2327 * RESERVATIONS RELEASED. 2328 */ 2329 if (pr_holder && 2330 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2331 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2332 list_for_each_entry(pr_reg_p, 2333 &pr_tmpl->registration_list, 2334 pr_reg_list) { 2335 2336 core_scsi3_ua_allocate( 2337 pr_reg_p->pr_reg_nacl, 2338 pr_reg_p->pr_res_mapped_lun, 2339 0x2A, 2340 ASCQ_2AH_RESERVATIONS_RELEASED); 2341 } 2342 } 2343 spin_unlock(&pr_tmpl->registration_lock); 2344 2345 if (!aptpl) { 2346 pr_tmpl->pr_aptpl_active = 0; 2347 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2348 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2349 " for UNREGISTER\n"); 2350 return 0; 2351 } 2352 2353 ret = core_scsi3_update_and_write_aptpl(dev, 2354 &pr_aptpl_buf[0], 2355 pr_tmpl->pr_aptpl_buf_len); 2356 if (!ret) { 2357 pr_tmpl->pr_aptpl_active = 1; 2358 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2359 " for UNREGISTER\n"); 2360 } 2361 2362 kfree(pr_aptpl_buf); 2363 return ret; 2364 } else { 2365 /* 2366 * Increment PRgeneration counter for struct se_device" 2367 * upon a successful REGISTER, see spc4r17 section 6.3.2 2368 * READ_KEYS service action. 2369 */ 2370 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2371 cmd->se_dev); 2372 pr_reg->pr_res_key = sa_res_key; 2373 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2374 " Key for %s to: 0x%016Lx PRgeneration:" 2375 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2376 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2377 pr_reg->pr_reg_nacl->initiatorname, 2378 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2379 2380 if (!aptpl) { 2381 pr_tmpl->pr_aptpl_active = 0; 2382 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2383 core_scsi3_put_pr_reg(pr_reg); 2384 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2385 " for REGISTER\n"); 2386 return 0; 2387 } 2388 2389 ret = core_scsi3_update_and_write_aptpl(dev, 2390 &pr_aptpl_buf[0], 2391 pr_tmpl->pr_aptpl_buf_len); 2392 if (!ret) { 2393 pr_tmpl->pr_aptpl_active = 1; 2394 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2395 " for REGISTER\n"); 2396 } 2397 2398 kfree(pr_aptpl_buf); 2399 core_scsi3_put_pr_reg(pr_reg); 2400 } 2401 } 2402 return 0; 2403 } 2404 2405 unsigned char *core_scsi3_pr_dump_type(int type) 2406 { 2407 switch (type) { 2408 case PR_TYPE_WRITE_EXCLUSIVE: 2409 return "Write Exclusive Access"; 2410 case PR_TYPE_EXCLUSIVE_ACCESS: 2411 return "Exclusive Access"; 2412 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2413 return "Write Exclusive Access, Registrants Only"; 2414 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2415 return "Exclusive Access, Registrants Only"; 2416 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2417 return "Write Exclusive Access, All Registrants"; 2418 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2419 return "Exclusive Access, All Registrants"; 2420 default: 2421 break; 2422 } 2423 2424 return "Unknown SPC-3 PR Type"; 2425 } 2426 2427 static int core_scsi3_pro_reserve( 2428 struct se_cmd *cmd, 2429 struct se_device *dev, 2430 int type, 2431 int scope, 2432 u64 res_key) 2433 { 2434 struct se_session *se_sess = cmd->se_sess; 2435 struct se_lun *se_lun = cmd->se_lun; 2436 struct t10_pr_registration *pr_reg, *pr_res_holder; 2437 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2438 char i_buf[PR_REG_ISID_ID_LEN]; 2439 int ret, prf_isid; 2440 2441 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2442 2443 if (!se_sess || !se_lun) { 2444 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2445 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2446 return -EINVAL; 2447 } 2448 /* 2449 * Locate the existing *pr_reg via struct se_node_acl pointers 2450 */ 2451 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2452 se_sess); 2453 if (!pr_reg) { 2454 pr_err("SPC-3 PR: Unable to locate" 2455 " PR_REGISTERED *pr_reg for RESERVE\n"); 2456 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2457 return -EINVAL; 2458 } 2459 /* 2460 * From spc4r17 Section 5.7.9: Reserving: 2461 * 2462 * An application client creates a persistent reservation by issuing 2463 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2464 * a registered I_T nexus with the following parameters: 2465 * a) RESERVATION KEY set to the value of the reservation key that is 2466 * registered with the logical unit for the I_T nexus; and 2467 */ 2468 if (res_key != pr_reg->pr_res_key) { 2469 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2470 " does not match existing SA REGISTER res_key:" 2471 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2472 core_scsi3_put_pr_reg(pr_reg); 2473 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2474 return -EINVAL; 2475 } 2476 /* 2477 * From spc4r17 Section 5.7.9: Reserving: 2478 * 2479 * From above: 2480 * b) TYPE field and SCOPE field set to the persistent reservation 2481 * being created. 2482 * 2483 * Only one persistent reservation is allowed at a time per logical unit 2484 * and that persistent reservation has a scope of LU_SCOPE. 2485 */ 2486 if (scope != PR_SCOPE_LU_SCOPE) { 2487 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2488 core_scsi3_put_pr_reg(pr_reg); 2489 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2490 return -EINVAL; 2491 } 2492 /* 2493 * See if we have an existing PR reservation holder pointer at 2494 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2495 * *pr_res_holder. 2496 */ 2497 spin_lock(&dev->dev_reservation_lock); 2498 pr_res_holder = dev->dev_pr_res_holder; 2499 if (pr_res_holder) { 2500 /* 2501 * From spc4r17 Section 5.7.9: Reserving: 2502 * 2503 * If the device server receives a PERSISTENT RESERVE OUT 2504 * command from an I_T nexus other than a persistent reservation 2505 * holder (see 5.7.10) that attempts to create a persistent 2506 * reservation when a persistent reservation already exists for 2507 * the logical unit, then the command shall be completed with 2508 * RESERVATION CONFLICT status. 2509 */ 2510 if (pr_res_holder != pr_reg) { 2511 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2512 pr_err("SPC-3 PR: Attempted RESERVE from" 2513 " [%s]: %s while reservation already held by" 2514 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2515 cmd->se_tfo->get_fabric_name(), 2516 se_sess->se_node_acl->initiatorname, 2517 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2518 pr_res_holder->pr_reg_nacl->initiatorname); 2519 2520 spin_unlock(&dev->dev_reservation_lock); 2521 core_scsi3_put_pr_reg(pr_reg); 2522 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2523 return -EINVAL; 2524 } 2525 /* 2526 * From spc4r17 Section 5.7.9: Reserving: 2527 * 2528 * If a persistent reservation holder attempts to modify the 2529 * type or scope of an existing persistent reservation, the 2530 * command shall be completed with RESERVATION CONFLICT status. 2531 */ 2532 if ((pr_res_holder->pr_res_type != type) || 2533 (pr_res_holder->pr_res_scope != scope)) { 2534 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2535 pr_err("SPC-3 PR: Attempted RESERVE from" 2536 " [%s]: %s trying to change TYPE and/or SCOPE," 2537 " while reservation already held by [%s]: %s," 2538 " returning RESERVATION_CONFLICT\n", 2539 cmd->se_tfo->get_fabric_name(), 2540 se_sess->se_node_acl->initiatorname, 2541 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2542 pr_res_holder->pr_reg_nacl->initiatorname); 2543 2544 spin_unlock(&dev->dev_reservation_lock); 2545 core_scsi3_put_pr_reg(pr_reg); 2546 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2547 return -EINVAL; 2548 } 2549 /* 2550 * From spc4r17 Section 5.7.9: Reserving: 2551 * 2552 * If the device server receives a PERSISTENT RESERVE OUT 2553 * command with RESERVE service action where the TYPE field and 2554 * the SCOPE field contain the same values as the existing type 2555 * and scope from a persistent reservation holder, it shall not 2556 * make any change to the existing persistent reservation and 2557 * shall completethe command with GOOD status. 2558 */ 2559 spin_unlock(&dev->dev_reservation_lock); 2560 core_scsi3_put_pr_reg(pr_reg); 2561 return 0; 2562 } 2563 /* 2564 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2565 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2566 */ 2567 pr_reg->pr_res_scope = scope; 2568 pr_reg->pr_res_type = type; 2569 pr_reg->pr_res_holder = 1; 2570 dev->dev_pr_res_holder = pr_reg; 2571 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2572 PR_REG_ISID_ID_LEN); 2573 2574 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2575 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2576 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2577 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2578 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2579 cmd->se_tfo->get_fabric_name(), 2580 se_sess->se_node_acl->initiatorname, 2581 (prf_isid) ? &i_buf[0] : ""); 2582 spin_unlock(&dev->dev_reservation_lock); 2583 2584 if (pr_tmpl->pr_aptpl_active) { 2585 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2586 &pr_reg->pr_aptpl_buf[0], 2587 pr_tmpl->pr_aptpl_buf_len); 2588 if (!ret) 2589 pr_debug("SPC-3 PR: Updated APTPL metadata" 2590 " for RESERVE\n"); 2591 } 2592 2593 core_scsi3_put_pr_reg(pr_reg); 2594 return 0; 2595 } 2596 2597 static int core_scsi3_emulate_pro_reserve( 2598 struct se_cmd *cmd, 2599 int type, 2600 int scope, 2601 u64 res_key) 2602 { 2603 struct se_device *dev = cmd->se_dev; 2604 int ret = 0; 2605 2606 switch (type) { 2607 case PR_TYPE_WRITE_EXCLUSIVE: 2608 case PR_TYPE_EXCLUSIVE_ACCESS: 2609 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2610 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2611 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2612 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2613 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2614 break; 2615 default: 2616 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2617 " 0x%02x\n", type); 2618 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2619 return -EINVAL; 2620 } 2621 2622 return ret; 2623 } 2624 2625 /* 2626 * Called with struct se_device->dev_reservation_lock held. 2627 */ 2628 static void __core_scsi3_complete_pro_release( 2629 struct se_device *dev, 2630 struct se_node_acl *se_nacl, 2631 struct t10_pr_registration *pr_reg, 2632 int explict) 2633 { 2634 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2635 char i_buf[PR_REG_ISID_ID_LEN]; 2636 int prf_isid; 2637 2638 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2639 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2640 PR_REG_ISID_ID_LEN); 2641 /* 2642 * Go ahead and release the current PR reservation holder. 2643 */ 2644 dev->dev_pr_res_holder = NULL; 2645 2646 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2647 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2648 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2649 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2650 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2651 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2652 tfo->get_fabric_name(), se_nacl->initiatorname, 2653 (prf_isid) ? &i_buf[0] : ""); 2654 /* 2655 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2656 */ 2657 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2658 } 2659 2660 static int core_scsi3_emulate_pro_release( 2661 struct se_cmd *cmd, 2662 int type, 2663 int scope, 2664 u64 res_key) 2665 { 2666 struct se_device *dev = cmd->se_dev; 2667 struct se_session *se_sess = cmd->se_sess; 2668 struct se_lun *se_lun = cmd->se_lun; 2669 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2670 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2671 int ret, all_reg = 0; 2672 2673 if (!se_sess || !se_lun) { 2674 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2675 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2676 return -EINVAL; 2677 } 2678 /* 2679 * Locate the existing *pr_reg via struct se_node_acl pointers 2680 */ 2681 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2682 if (!pr_reg) { 2683 pr_err("SPC-3 PR: Unable to locate" 2684 " PR_REGISTERED *pr_reg for RELEASE\n"); 2685 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2686 return -EINVAL; 2687 } 2688 /* 2689 * From spc4r17 Section 5.7.11.2 Releasing: 2690 * 2691 * If there is no persistent reservation or in response to a persistent 2692 * reservation release request from a registered I_T nexus that is not a 2693 * persistent reservation holder (see 5.7.10), the device server shall 2694 * do the following: 2695 * 2696 * a) Not release the persistent reservation, if any; 2697 * b) Not remove any registrations; and 2698 * c) Complete the command with GOOD status. 2699 */ 2700 spin_lock(&dev->dev_reservation_lock); 2701 pr_res_holder = dev->dev_pr_res_holder; 2702 if (!pr_res_holder) { 2703 /* 2704 * No persistent reservation, return GOOD status. 2705 */ 2706 spin_unlock(&dev->dev_reservation_lock); 2707 core_scsi3_put_pr_reg(pr_reg); 2708 return 0; 2709 } 2710 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2711 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2712 all_reg = 1; 2713 2714 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2715 /* 2716 * Non 'All Registrants' PR Type cases.. 2717 * Release request from a registered I_T nexus that is not a 2718 * persistent reservation holder. return GOOD status. 2719 */ 2720 spin_unlock(&dev->dev_reservation_lock); 2721 core_scsi3_put_pr_reg(pr_reg); 2722 return 0; 2723 } 2724 /* 2725 * From spc4r17 Section 5.7.11.2 Releasing: 2726 * 2727 * Only the persistent reservation holder (see 5.7.10) is allowed to 2728 * release a persistent reservation. 2729 * 2730 * An application client releases the persistent reservation by issuing 2731 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2732 * an I_T nexus that is a persistent reservation holder with the 2733 * following parameters: 2734 * 2735 * a) RESERVATION KEY field set to the value of the reservation key 2736 * that is registered with the logical unit for the I_T nexus; 2737 */ 2738 if (res_key != pr_reg->pr_res_key) { 2739 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2740 " does not match existing SA REGISTER res_key:" 2741 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2742 spin_unlock(&dev->dev_reservation_lock); 2743 core_scsi3_put_pr_reg(pr_reg); 2744 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2745 return -EINVAL; 2746 } 2747 /* 2748 * From spc4r17 Section 5.7.11.2 Releasing and above: 2749 * 2750 * b) TYPE field and SCOPE field set to match the persistent 2751 * reservation being released. 2752 */ 2753 if ((pr_res_holder->pr_res_type != type) || 2754 (pr_res_holder->pr_res_scope != scope)) { 2755 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2756 pr_err("SPC-3 PR RELEASE: Attempted to release" 2757 " reservation from [%s]: %s with different TYPE " 2758 "and/or SCOPE while reservation already held by" 2759 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2760 cmd->se_tfo->get_fabric_name(), 2761 se_sess->se_node_acl->initiatorname, 2762 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2763 pr_res_holder->pr_reg_nacl->initiatorname); 2764 2765 spin_unlock(&dev->dev_reservation_lock); 2766 core_scsi3_put_pr_reg(pr_reg); 2767 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2768 return -EINVAL; 2769 } 2770 /* 2771 * In response to a persistent reservation release request from the 2772 * persistent reservation holder the device server shall perform a 2773 * release by doing the following as an uninterrupted series of actions: 2774 * a) Release the persistent reservation; 2775 * b) Not remove any registration(s); 2776 * c) If the released persistent reservation is a registrants only type 2777 * or all registrants type persistent reservation, 2778 * the device server shall establish a unit attention condition for 2779 * the initiator port associated with every regis- 2780 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2781 * RESERVE OUT command with RELEASE service action was received, 2782 * with the additional sense code set to RESERVATIONS RELEASED; and 2783 * d) If the persistent reservation is of any other type, the device 2784 * server shall not establish a unit attention condition. 2785 */ 2786 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2787 pr_reg, 1); 2788 2789 spin_unlock(&dev->dev_reservation_lock); 2790 2791 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2792 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2793 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2794 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2795 /* 2796 * If no UNIT ATTENTION conditions will be established for 2797 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2798 * go ahead and check for APTPL=1 update+write below 2799 */ 2800 goto write_aptpl; 2801 } 2802 2803 spin_lock(&pr_tmpl->registration_lock); 2804 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2805 pr_reg_list) { 2806 /* 2807 * Do not establish a UNIT ATTENTION condition 2808 * for the calling I_T Nexus 2809 */ 2810 if (pr_reg_p == pr_reg) 2811 continue; 2812 2813 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2814 pr_reg_p->pr_res_mapped_lun, 2815 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2816 } 2817 spin_unlock(&pr_tmpl->registration_lock); 2818 2819 write_aptpl: 2820 if (pr_tmpl->pr_aptpl_active) { 2821 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2822 &pr_reg->pr_aptpl_buf[0], 2823 pr_tmpl->pr_aptpl_buf_len); 2824 if (!ret) 2825 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2826 } 2827 2828 core_scsi3_put_pr_reg(pr_reg); 2829 return 0; 2830 } 2831 2832 static int core_scsi3_emulate_pro_clear( 2833 struct se_cmd *cmd, 2834 u64 res_key) 2835 { 2836 struct se_device *dev = cmd->se_dev; 2837 struct se_node_acl *pr_reg_nacl; 2838 struct se_session *se_sess = cmd->se_sess; 2839 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2840 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2841 u32 pr_res_mapped_lun = 0; 2842 int calling_it_nexus = 0; 2843 /* 2844 * Locate the existing *pr_reg via struct se_node_acl pointers 2845 */ 2846 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2847 se_sess->se_node_acl, se_sess); 2848 if (!pr_reg_n) { 2849 pr_err("SPC-3 PR: Unable to locate" 2850 " PR_REGISTERED *pr_reg for CLEAR\n"); 2851 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2852 return -EINVAL; 2853 } 2854 /* 2855 * From spc4r17 section 5.7.11.6, Clearing: 2856 * 2857 * Any application client may release the persistent reservation and 2858 * remove all registrations from a device server by issuing a 2859 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2860 * registered I_T nexus with the following parameter: 2861 * 2862 * a) RESERVATION KEY field set to the value of the reservation key 2863 * that is registered with the logical unit for the I_T nexus. 2864 */ 2865 if (res_key != pr_reg_n->pr_res_key) { 2866 pr_err("SPC-3 PR REGISTER: Received" 2867 " res_key: 0x%016Lx does not match" 2868 " existing SA REGISTER res_key:" 2869 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2870 core_scsi3_put_pr_reg(pr_reg_n); 2871 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2872 return -EINVAL; 2873 } 2874 /* 2875 * a) Release the persistent reservation, if any; 2876 */ 2877 spin_lock(&dev->dev_reservation_lock); 2878 pr_res_holder = dev->dev_pr_res_holder; 2879 if (pr_res_holder) { 2880 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2881 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2882 pr_res_holder, 0); 2883 } 2884 spin_unlock(&dev->dev_reservation_lock); 2885 /* 2886 * b) Remove all registration(s) (see spc4r17 5.7.7); 2887 */ 2888 spin_lock(&pr_tmpl->registration_lock); 2889 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2890 &pr_tmpl->registration_list, pr_reg_list) { 2891 2892 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2893 pr_reg_nacl = pr_reg->pr_reg_nacl; 2894 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2895 __core_scsi3_free_registration(dev, pr_reg, NULL, 2896 calling_it_nexus); 2897 /* 2898 * e) Establish a unit attention condition for the initiator 2899 * port associated with every registered I_T nexus other 2900 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2901 * command with CLEAR service action was received, with the 2902 * additional sense code set to RESERVATIONS PREEMPTED. 2903 */ 2904 if (!calling_it_nexus) 2905 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2906 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2907 } 2908 spin_unlock(&pr_tmpl->registration_lock); 2909 2910 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2911 cmd->se_tfo->get_fabric_name()); 2912 2913 if (pr_tmpl->pr_aptpl_active) { 2914 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2915 pr_debug("SPC-3 PR: Updated APTPL metadata" 2916 " for CLEAR\n"); 2917 } 2918 2919 core_scsi3_pr_generation(dev); 2920 return 0; 2921 } 2922 2923 /* 2924 * Called with struct se_device->dev_reservation_lock held. 2925 */ 2926 static void __core_scsi3_complete_pro_preempt( 2927 struct se_device *dev, 2928 struct t10_pr_registration *pr_reg, 2929 struct list_head *preempt_and_abort_list, 2930 int type, 2931 int scope, 2932 int abort) 2933 { 2934 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2935 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2936 char i_buf[PR_REG_ISID_ID_LEN]; 2937 int prf_isid; 2938 2939 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2940 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2941 PR_REG_ISID_ID_LEN); 2942 /* 2943 * Do an implict RELEASE of the existing reservation. 2944 */ 2945 if (dev->dev_pr_res_holder) 2946 __core_scsi3_complete_pro_release(dev, nacl, 2947 dev->dev_pr_res_holder, 0); 2948 2949 dev->dev_pr_res_holder = pr_reg; 2950 pr_reg->pr_res_holder = 1; 2951 pr_reg->pr_res_type = type; 2952 pr_reg->pr_res_scope = scope; 2953 2954 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2955 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2956 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2957 core_scsi3_pr_dump_type(type), 2958 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2959 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2960 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2961 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2962 /* 2963 * For PREEMPT_AND_ABORT, add the preempting reservation's 2964 * struct t10_pr_registration to the list that will be compared 2965 * against received CDBs.. 2966 */ 2967 if (preempt_and_abort_list) 2968 list_add_tail(&pr_reg->pr_reg_abort_list, 2969 preempt_and_abort_list); 2970 } 2971 2972 static void core_scsi3_release_preempt_and_abort( 2973 struct list_head *preempt_and_abort_list, 2974 struct t10_pr_registration *pr_reg_holder) 2975 { 2976 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2977 2978 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2979 pr_reg_abort_list) { 2980 2981 list_del(&pr_reg->pr_reg_abort_list); 2982 if (pr_reg_holder == pr_reg) 2983 continue; 2984 if (pr_reg->pr_res_holder) { 2985 pr_warn("pr_reg->pr_res_holder still set\n"); 2986 continue; 2987 } 2988 2989 pr_reg->pr_reg_deve = NULL; 2990 pr_reg->pr_reg_nacl = NULL; 2991 kfree(pr_reg->pr_aptpl_buf); 2992 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2993 } 2994 } 2995 2996 static int core_scsi3_pro_preempt( 2997 struct se_cmd *cmd, 2998 int type, 2999 int scope, 3000 u64 res_key, 3001 u64 sa_res_key, 3002 int abort) 3003 { 3004 struct se_device *dev = cmd->se_dev; 3005 struct se_node_acl *pr_reg_nacl; 3006 struct se_session *se_sess = cmd->se_sess; 3007 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 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3020 se_sess); 3021 if (!pr_reg_n) { 3022 pr_err("SPC-3 PR: Unable to locate" 3023 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3024 (abort) ? "_AND_ABORT" : ""); 3025 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3026 return -EINVAL; 3027 } 3028 if (pr_reg_n->pr_res_key != res_key) { 3029 core_scsi3_put_pr_reg(pr_reg_n); 3030 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3031 return -EINVAL; 3032 } 3033 if (scope != PR_SCOPE_LU_SCOPE) { 3034 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3035 core_scsi3_put_pr_reg(pr_reg_n); 3036 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3037 return -EINVAL; 3038 } 3039 3040 spin_lock(&dev->dev_reservation_lock); 3041 pr_res_holder = dev->dev_pr_res_holder; 3042 if (pr_res_holder && 3043 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3044 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3045 all_reg = 1; 3046 3047 if (!all_reg && !sa_res_key) { 3048 spin_unlock(&dev->dev_reservation_lock); 3049 core_scsi3_put_pr_reg(pr_reg_n); 3050 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3051 return -EINVAL; 3052 } 3053 /* 3054 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3055 * 3056 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3057 * persistent reservation holder or there is no persistent reservation 3058 * holder (i.e., there is no persistent reservation), then the device 3059 * server shall perform a preempt by doing the following in an 3060 * uninterrupted series of actions. (See below..) 3061 */ 3062 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3063 /* 3064 * No existing or SA Reservation Key matching reservations.. 3065 * 3066 * PROUT SA PREEMPT with All Registrant type reservations are 3067 * allowed to be processed without a matching SA Reservation Key 3068 */ 3069 spin_lock(&pr_tmpl->registration_lock); 3070 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3071 &pr_tmpl->registration_list, pr_reg_list) { 3072 /* 3073 * Removing of registrations in non all registrants 3074 * type reservations without a matching SA reservation 3075 * key. 3076 * 3077 * a) Remove the registrations for all I_T nexuses 3078 * specified by the SERVICE ACTION RESERVATION KEY 3079 * field; 3080 * b) Ignore the contents of the SCOPE and TYPE fields; 3081 * c) Process tasks as defined in 5.7.1; and 3082 * d) Establish a unit attention condition for the 3083 * initiator port associated with every I_T nexus 3084 * that lost its registration other than the I_T 3085 * nexus on which the PERSISTENT RESERVE OUT command 3086 * was received, with the additional sense code set 3087 * to REGISTRATIONS PREEMPTED. 3088 */ 3089 if (!all_reg) { 3090 if (pr_reg->pr_res_key != sa_res_key) 3091 continue; 3092 3093 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3094 pr_reg_nacl = pr_reg->pr_reg_nacl; 3095 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3096 __core_scsi3_free_registration(dev, pr_reg, 3097 (abort) ? &preempt_and_abort_list : 3098 NULL, calling_it_nexus); 3099 released_regs++; 3100 } else { 3101 /* 3102 * Case for any existing all registrants type 3103 * reservation, follow logic in spc4r17 section 3104 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3105 * 3106 * For a ZERO SA Reservation key, release 3107 * all other registrations and do an implict 3108 * release of active persistent reservation. 3109 * 3110 * For a non-ZERO SA Reservation key, only 3111 * release the matching reservation key from 3112 * registrations. 3113 */ 3114 if ((sa_res_key) && 3115 (pr_reg->pr_res_key != sa_res_key)) 3116 continue; 3117 3118 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3119 if (calling_it_nexus) 3120 continue; 3121 3122 pr_reg_nacl = pr_reg->pr_reg_nacl; 3123 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3124 __core_scsi3_free_registration(dev, pr_reg, 3125 (abort) ? &preempt_and_abort_list : 3126 NULL, 0); 3127 released_regs++; 3128 } 3129 if (!calling_it_nexus) 3130 core_scsi3_ua_allocate(pr_reg_nacl, 3131 pr_res_mapped_lun, 0x2A, 3132 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3133 } 3134 spin_unlock(&pr_tmpl->registration_lock); 3135 /* 3136 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3137 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3138 * RESERVATION KEY field to a value that does not match any 3139 * registered reservation key, then the device server shall 3140 * complete the command with RESERVATION CONFLICT status. 3141 */ 3142 if (!released_regs) { 3143 spin_unlock(&dev->dev_reservation_lock); 3144 core_scsi3_put_pr_reg(pr_reg_n); 3145 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3146 return -EINVAL; 3147 } 3148 /* 3149 * For an existing all registrants type reservation 3150 * with a zero SA rservation key, preempt the existing 3151 * reservation with the new PR type and scope. 3152 */ 3153 if (pr_res_holder && all_reg && !(sa_res_key)) { 3154 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3155 (abort) ? &preempt_and_abort_list : NULL, 3156 type, scope, abort); 3157 3158 if (abort) 3159 core_scsi3_release_preempt_and_abort( 3160 &preempt_and_abort_list, pr_reg_n); 3161 } 3162 spin_unlock(&dev->dev_reservation_lock); 3163 3164 if (pr_tmpl->pr_aptpl_active) { 3165 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3166 &pr_reg_n->pr_aptpl_buf[0], 3167 pr_tmpl->pr_aptpl_buf_len); 3168 if (!ret) 3169 pr_debug("SPC-3 PR: Updated APTPL" 3170 " metadata for PREEMPT%s\n", (abort) ? 3171 "_AND_ABORT" : ""); 3172 } 3173 3174 core_scsi3_put_pr_reg(pr_reg_n); 3175 core_scsi3_pr_generation(cmd->se_dev); 3176 return 0; 3177 } 3178 /* 3179 * The PREEMPTing SA reservation key matches that of the 3180 * existing persistent reservation, first, we check if 3181 * we are preempting our own reservation. 3182 * From spc4r17, section 5.7.11.4.3 Preempting 3183 * persistent reservations and registration handling 3184 * 3185 * If an all registrants persistent reservation is not 3186 * present, it is not an error for the persistent 3187 * reservation holder to preempt itself (i.e., a 3188 * PERSISTENT RESERVE OUT with a PREEMPT service action 3189 * or a PREEMPT AND ABORT service action with the 3190 * SERVICE ACTION RESERVATION KEY value equal to the 3191 * persistent reservation holder's reservation key that 3192 * is received from the persistent reservation holder). 3193 * In that case, the device server shall establish the 3194 * new persistent reservation and maintain the 3195 * registration. 3196 */ 3197 prh_type = pr_res_holder->pr_res_type; 3198 prh_scope = pr_res_holder->pr_res_scope; 3199 /* 3200 * If the SERVICE ACTION RESERVATION KEY field identifies a 3201 * persistent reservation holder (see 5.7.10), the device 3202 * server shall perform a preempt by doing the following as 3203 * an uninterrupted series of actions: 3204 * 3205 * a) Release the persistent reservation for the holder 3206 * identified by the SERVICE ACTION RESERVATION KEY field; 3207 */ 3208 if (pr_reg_n != pr_res_holder) 3209 __core_scsi3_complete_pro_release(dev, 3210 pr_res_holder->pr_reg_nacl, 3211 dev->dev_pr_res_holder, 0); 3212 /* 3213 * b) Remove the registrations for all I_T nexuses identified 3214 * by the SERVICE ACTION RESERVATION KEY field, except the 3215 * I_T nexus that is being used for the PERSISTENT RESERVE 3216 * OUT command. If an all registrants persistent reservation 3217 * is present and the SERVICE ACTION RESERVATION KEY field 3218 * is set to zero, then all registrations shall be removed 3219 * except for that of the I_T nexus that is being used for 3220 * the PERSISTENT RESERVE OUT command; 3221 */ 3222 spin_lock(&pr_tmpl->registration_lock); 3223 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3224 &pr_tmpl->registration_list, pr_reg_list) { 3225 3226 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3227 if (calling_it_nexus) 3228 continue; 3229 3230 if (pr_reg->pr_res_key != sa_res_key) 3231 continue; 3232 3233 pr_reg_nacl = pr_reg->pr_reg_nacl; 3234 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3235 __core_scsi3_free_registration(dev, pr_reg, 3236 (abort) ? &preempt_and_abort_list : NULL, 3237 calling_it_nexus); 3238 /* 3239 * e) Establish a unit attention condition for the initiator 3240 * port associated with every I_T nexus that lost its 3241 * persistent reservation and/or registration, with the 3242 * additional sense code set to REGISTRATIONS PREEMPTED; 3243 */ 3244 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3245 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3246 } 3247 spin_unlock(&pr_tmpl->registration_lock); 3248 /* 3249 * c) Establish a persistent reservation for the preempting 3250 * I_T nexus using the contents of the SCOPE and TYPE fields; 3251 */ 3252 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3253 (abort) ? &preempt_and_abort_list : NULL, 3254 type, scope, abort); 3255 /* 3256 * d) Process tasks as defined in 5.7.1; 3257 * e) See above.. 3258 * f) If the type or scope has changed, then for every I_T nexus 3259 * whose reservation key was not removed, except for the I_T 3260 * nexus on which the PERSISTENT RESERVE OUT command was 3261 * received, the device server shall establish a unit 3262 * attention condition for the initiator port associated with 3263 * that I_T nexus, with the additional sense code set to 3264 * RESERVATIONS RELEASED. If the type or scope have not 3265 * changed, then no unit attention condition(s) shall be 3266 * established for this reason. 3267 */ 3268 if ((prh_type != type) || (prh_scope != scope)) { 3269 spin_lock(&pr_tmpl->registration_lock); 3270 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3271 &pr_tmpl->registration_list, pr_reg_list) { 3272 3273 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3274 if (calling_it_nexus) 3275 continue; 3276 3277 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3278 pr_reg->pr_res_mapped_lun, 0x2A, 3279 ASCQ_2AH_RESERVATIONS_RELEASED); 3280 } 3281 spin_unlock(&pr_tmpl->registration_lock); 3282 } 3283 spin_unlock(&dev->dev_reservation_lock); 3284 /* 3285 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3286 * All received CDBs for the matching existing reservation and 3287 * registrations undergo ABORT_TASK logic. 3288 * 3289 * From there, core_scsi3_release_preempt_and_abort() will 3290 * release every registration in the list (which have already 3291 * been removed from the primary pr_reg list), except the 3292 * new persistent reservation holder, the calling Initiator Port. 3293 */ 3294 if (abort) { 3295 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3296 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3297 pr_reg_n); 3298 } 3299 3300 if (pr_tmpl->pr_aptpl_active) { 3301 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3302 &pr_reg_n->pr_aptpl_buf[0], 3303 pr_tmpl->pr_aptpl_buf_len); 3304 if (!ret) 3305 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3306 "%s\n", (abort) ? "_AND_ABORT" : ""); 3307 } 3308 3309 core_scsi3_put_pr_reg(pr_reg_n); 3310 core_scsi3_pr_generation(cmd->se_dev); 3311 return 0; 3312 } 3313 3314 static int core_scsi3_emulate_pro_preempt( 3315 struct se_cmd *cmd, 3316 int type, 3317 int scope, 3318 u64 res_key, 3319 u64 sa_res_key, 3320 int abort) 3321 { 3322 int ret = 0; 3323 3324 switch (type) { 3325 case PR_TYPE_WRITE_EXCLUSIVE: 3326 case PR_TYPE_EXCLUSIVE_ACCESS: 3327 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3328 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3329 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3330 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3331 ret = core_scsi3_pro_preempt(cmd, type, scope, 3332 res_key, sa_res_key, abort); 3333 break; 3334 default: 3335 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3336 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3337 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3338 return -EINVAL; 3339 } 3340 3341 return ret; 3342 } 3343 3344 3345 static int core_scsi3_emulate_pro_register_and_move( 3346 struct se_cmd *cmd, 3347 u64 res_key, 3348 u64 sa_res_key, 3349 int aptpl, 3350 int unreg) 3351 { 3352 struct se_session *se_sess = cmd->se_sess; 3353 struct se_device *dev = cmd->se_dev; 3354 struct se_dev_entry *dest_se_deve = NULL; 3355 struct se_lun *se_lun = cmd->se_lun; 3356 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3357 struct se_port *se_port; 3358 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3359 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3360 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3361 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3362 unsigned char *buf; 3363 unsigned char *initiator_str; 3364 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3365 u32 tid_len, tmp_tid_len; 3366 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3367 unsigned short rtpi; 3368 unsigned char proto_ident; 3369 3370 if (!se_sess || !se_lun) { 3371 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3372 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3373 return -EINVAL; 3374 } 3375 memset(dest_iport, 0, 64); 3376 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3377 se_tpg = se_sess->se_tpg; 3378 tf_ops = se_tpg->se_tpg_tfo; 3379 /* 3380 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3381 * Register behaviors for a REGISTER AND MOVE service action 3382 * 3383 * Locate the existing *pr_reg via struct se_node_acl pointers 3384 */ 3385 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3386 se_sess); 3387 if (!pr_reg) { 3388 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3389 " *pr_reg for REGISTER_AND_MOVE\n"); 3390 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3391 return -EINVAL; 3392 } 3393 /* 3394 * The provided reservation key much match the existing reservation key 3395 * provided during this initiator's I_T nexus registration. 3396 */ 3397 if (res_key != pr_reg->pr_res_key) { 3398 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3399 " res_key: 0x%016Lx does not match existing SA REGISTER" 3400 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3401 core_scsi3_put_pr_reg(pr_reg); 3402 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3403 return -EINVAL; 3404 } 3405 /* 3406 * The service active reservation key needs to be non zero 3407 */ 3408 if (!sa_res_key) { 3409 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3410 " sa_res_key\n"); 3411 core_scsi3_put_pr_reg(pr_reg); 3412 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3413 return -EINVAL; 3414 } 3415 3416 /* 3417 * Determine the Relative Target Port Identifier where the reservation 3418 * will be moved to for the TransportID containing SCSI initiator WWN 3419 * information. 3420 */ 3421 buf = transport_kmap_data_sg(cmd); 3422 rtpi = (buf[18] & 0xff) << 8; 3423 rtpi |= buf[19] & 0xff; 3424 tid_len = (buf[20] & 0xff) << 24; 3425 tid_len |= (buf[21] & 0xff) << 16; 3426 tid_len |= (buf[22] & 0xff) << 8; 3427 tid_len |= buf[23] & 0xff; 3428 transport_kunmap_data_sg(cmd); 3429 buf = NULL; 3430 3431 if ((tid_len + 24) != cmd->data_length) { 3432 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3433 " does not equal CDB data_length: %u\n", tid_len, 3434 cmd->data_length); 3435 core_scsi3_put_pr_reg(pr_reg); 3436 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3437 return -EINVAL; 3438 } 3439 3440 spin_lock(&dev->se_port_lock); 3441 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3442 if (se_port->sep_rtpi != rtpi) 3443 continue; 3444 dest_se_tpg = se_port->sep_tpg; 3445 if (!dest_se_tpg) 3446 continue; 3447 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3448 if (!dest_tf_ops) 3449 continue; 3450 3451 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3452 smp_mb__after_atomic_inc(); 3453 spin_unlock(&dev->se_port_lock); 3454 3455 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3456 if (ret != 0) { 3457 pr_err("core_scsi3_tpg_depend_item() failed" 3458 " for dest_se_tpg\n"); 3459 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3460 smp_mb__after_atomic_dec(); 3461 core_scsi3_put_pr_reg(pr_reg); 3462 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3463 return -EINVAL; 3464 } 3465 3466 spin_lock(&dev->se_port_lock); 3467 break; 3468 } 3469 spin_unlock(&dev->se_port_lock); 3470 3471 if (!dest_se_tpg || !dest_tf_ops) { 3472 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3473 " fabric ops from Relative Target Port Identifier:" 3474 " %hu\n", rtpi); 3475 core_scsi3_put_pr_reg(pr_reg); 3476 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3477 return -EINVAL; 3478 } 3479 3480 buf = transport_kmap_data_sg(cmd); 3481 proto_ident = (buf[24] & 0x0f); 3482 3483 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3484 " 0x%02x\n", proto_ident); 3485 3486 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3487 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3488 " proto_ident: 0x%02x does not match ident: 0x%02x" 3489 " from fabric: %s\n", proto_ident, 3490 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3491 dest_tf_ops->get_fabric_name()); 3492 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3493 ret = -EINVAL; 3494 goto out; 3495 } 3496 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3497 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3498 " containg a valid tpg_parse_pr_out_transport_id" 3499 " function pointer\n"); 3500 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3501 ret = -EINVAL; 3502 goto out; 3503 } 3504 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3505 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3506 if (!initiator_str) { 3507 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3508 " initiator_str from Transport ID\n"); 3509 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3510 ret = -EINVAL; 3511 goto out; 3512 } 3513 3514 transport_kunmap_data_sg(cmd); 3515 buf = NULL; 3516 3517 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3518 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3519 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3520 iport_ptr : ""); 3521 /* 3522 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3523 * action specifies a TransportID that is the same as the initiator port 3524 * of the I_T nexus for the command received, then the command shall 3525 * be terminated with CHECK CONDITION status, with the sense key set to 3526 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3527 * IN PARAMETER LIST. 3528 */ 3529 pr_reg_nacl = pr_reg->pr_reg_nacl; 3530 matching_iname = (!strcmp(initiator_str, 3531 pr_reg_nacl->initiatorname)) ? 1 : 0; 3532 if (!matching_iname) 3533 goto after_iport_check; 3534 3535 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3536 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3537 " matches: %s on received I_T Nexus\n", initiator_str, 3538 pr_reg_nacl->initiatorname); 3539 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3540 ret = -EINVAL; 3541 goto out; 3542 } 3543 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3544 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3545 " matches: %s %s on received I_T Nexus\n", 3546 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3547 pr_reg->pr_reg_isid); 3548 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3549 ret = -EINVAL; 3550 goto out; 3551 } 3552 after_iport_check: 3553 /* 3554 * Locate the destination struct se_node_acl from the received Transport ID 3555 */ 3556 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3557 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3558 initiator_str); 3559 if (dest_node_acl) { 3560 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3561 smp_mb__after_atomic_inc(); 3562 } 3563 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3564 3565 if (!dest_node_acl) { 3566 pr_err("Unable to locate %s dest_node_acl for" 3567 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3568 initiator_str); 3569 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3570 ret = -EINVAL; 3571 goto out; 3572 } 3573 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3574 if (ret != 0) { 3575 pr_err("core_scsi3_nodeacl_depend_item() for" 3576 " dest_node_acl\n"); 3577 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3578 smp_mb__after_atomic_dec(); 3579 dest_node_acl = NULL; 3580 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3581 ret = -EINVAL; 3582 goto out; 3583 } 3584 3585 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3586 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3587 dest_node_acl->initiatorname); 3588 3589 /* 3590 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3591 * PORT IDENTIFIER. 3592 */ 3593 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3594 if (!dest_se_deve) { 3595 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3596 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3597 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3598 ret = -EINVAL; 3599 goto out; 3600 } 3601 3602 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3603 if (ret < 0) { 3604 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3605 atomic_dec(&dest_se_deve->pr_ref_count); 3606 smp_mb__after_atomic_dec(); 3607 dest_se_deve = NULL; 3608 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3609 ret = -EINVAL; 3610 goto out; 3611 } 3612 3613 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3614 " ACL for dest_se_deve->mapped_lun: %u\n", 3615 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3616 dest_se_deve->mapped_lun); 3617 3618 /* 3619 * A persistent reservation needs to already existing in order to 3620 * successfully complete the REGISTER_AND_MOVE service action.. 3621 */ 3622 spin_lock(&dev->dev_reservation_lock); 3623 pr_res_holder = dev->dev_pr_res_holder; 3624 if (!pr_res_holder) { 3625 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3626 " currently held\n"); 3627 spin_unlock(&dev->dev_reservation_lock); 3628 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3629 ret = -EINVAL; 3630 goto out; 3631 } 3632 /* 3633 * The received on I_T Nexus must be the reservation holder. 3634 * 3635 * From spc4r17 section 5.7.8 Table 50 -- 3636 * Register behaviors for a REGISTER AND MOVE service action 3637 */ 3638 if (pr_res_holder != pr_reg) { 3639 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3640 " Nexus is not reservation holder\n"); 3641 spin_unlock(&dev->dev_reservation_lock); 3642 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3643 ret = -EINVAL; 3644 goto out; 3645 } 3646 /* 3647 * From spc4r17 section 5.7.8: registering and moving reservation 3648 * 3649 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3650 * action is received and the established persistent reservation is a 3651 * Write Exclusive - All Registrants type or Exclusive Access - 3652 * All Registrants type reservation, then the command shall be completed 3653 * with RESERVATION CONFLICT status. 3654 */ 3655 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3656 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3657 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3658 " reservation for type: %s\n", 3659 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3660 spin_unlock(&dev->dev_reservation_lock); 3661 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3662 ret = -EINVAL; 3663 goto out; 3664 } 3665 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3666 /* 3667 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3668 */ 3669 type = pr_res_holder->pr_res_type; 3670 scope = pr_res_holder->pr_res_type; 3671 /* 3672 * c) Associate the reservation key specified in the SERVICE ACTION 3673 * RESERVATION KEY field with the I_T nexus specified as the 3674 * destination of the register and move, where: 3675 * A) The I_T nexus is specified by the TransportID and the 3676 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3677 * B) Regardless of the TransportID format used, the association for 3678 * the initiator port is based on either the initiator port name 3679 * (see 3.1.71) on SCSI transport protocols where port names are 3680 * required or the initiator port identifier (see 3.1.70) on SCSI 3681 * transport protocols where port names are not required; 3682 * d) Register the reservation key specified in the SERVICE ACTION 3683 * RESERVATION KEY field; 3684 * e) Retain the reservation key specified in the SERVICE ACTION 3685 * RESERVATION KEY field and associated information; 3686 * 3687 * Also, It is not an error for a REGISTER AND MOVE service action to 3688 * register an I_T nexus that is already registered with the same 3689 * reservation key or a different reservation key. 3690 */ 3691 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3692 iport_ptr); 3693 if (!dest_pr_reg) { 3694 ret = core_scsi3_alloc_registration(cmd->se_dev, 3695 dest_node_acl, dest_se_deve, iport_ptr, 3696 sa_res_key, 0, aptpl, 2, 1); 3697 if (ret != 0) { 3698 spin_unlock(&dev->dev_reservation_lock); 3699 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3700 ret = -EINVAL; 3701 goto out; 3702 } 3703 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3704 iport_ptr); 3705 new_reg = 1; 3706 } 3707 /* 3708 * f) Release the persistent reservation for the persistent reservation 3709 * holder (i.e., the I_T nexus on which the 3710 */ 3711 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3712 dev->dev_pr_res_holder, 0); 3713 /* 3714 * g) Move the persistent reservation to the specified I_T nexus using 3715 * the same scope and type as the persistent reservation released in 3716 * item f); and 3717 */ 3718 dev->dev_pr_res_holder = dest_pr_reg; 3719 dest_pr_reg->pr_res_holder = 1; 3720 dest_pr_reg->pr_res_type = type; 3721 pr_reg->pr_res_scope = scope; 3722 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3723 PR_REG_ISID_ID_LEN); 3724 /* 3725 * Increment PRGeneration for existing registrations.. 3726 */ 3727 if (!new_reg) 3728 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3729 spin_unlock(&dev->dev_reservation_lock); 3730 3731 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3732 " created new reservation holder TYPE: %s on object RTPI:" 3733 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3734 core_scsi3_pr_dump_type(type), rtpi, 3735 dest_pr_reg->pr_res_generation); 3736 pr_debug("SPC-3 PR Successfully moved reservation from" 3737 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3738 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3739 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3740 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3741 iport_ptr : ""); 3742 /* 3743 * It is now safe to release configfs group dependencies for destination 3744 * of Transport ID Initiator Device/Port Identifier 3745 */ 3746 core_scsi3_lunacl_undepend_item(dest_se_deve); 3747 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3748 core_scsi3_tpg_undepend_item(dest_se_tpg); 3749 /* 3750 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3751 * nexus on which PERSISTENT RESERVE OUT command was received. 3752 */ 3753 if (unreg) { 3754 spin_lock(&pr_tmpl->registration_lock); 3755 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3756 spin_unlock(&pr_tmpl->registration_lock); 3757 } else 3758 core_scsi3_put_pr_reg(pr_reg); 3759 3760 /* 3761 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3762 * write out the updated metadata to struct file for this SCSI device. 3763 */ 3764 if (!aptpl) { 3765 pr_tmpl->pr_aptpl_active = 0; 3766 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3767 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3768 " REGISTER_AND_MOVE\n"); 3769 } else { 3770 pr_tmpl->pr_aptpl_active = 1; 3771 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3772 &dest_pr_reg->pr_aptpl_buf[0], 3773 pr_tmpl->pr_aptpl_buf_len); 3774 if (!ret) 3775 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3776 " REGISTER_AND_MOVE\n"); 3777 } 3778 3779 transport_kunmap_data_sg(cmd); 3780 3781 core_scsi3_put_pr_reg(dest_pr_reg); 3782 return 0; 3783 out: 3784 if (buf) 3785 transport_kunmap_data_sg(cmd); 3786 if (dest_se_deve) 3787 core_scsi3_lunacl_undepend_item(dest_se_deve); 3788 if (dest_node_acl) 3789 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3790 core_scsi3_tpg_undepend_item(dest_se_tpg); 3791 core_scsi3_put_pr_reg(pr_reg); 3792 return ret; 3793 } 3794 3795 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3796 { 3797 unsigned int __v1, __v2; 3798 3799 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3800 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3801 3802 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3803 } 3804 3805 /* 3806 * See spc4r17 section 6.14 Table 170 3807 */ 3808 int target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3809 { 3810 unsigned char *cdb = &cmd->t_task_cdb[0]; 3811 unsigned char *buf; 3812 u64 res_key, sa_res_key; 3813 int sa, scope, type, aptpl; 3814 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3815 int ret; 3816 3817 /* 3818 * Following spc2r20 5.5.1 Reservations overview: 3819 * 3820 * If a logical unit has been reserved by any RESERVE command and is 3821 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3822 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3823 * initiator or service action and shall terminate with a RESERVATION 3824 * CONFLICT status. 3825 */ 3826 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3827 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3828 " SPC-2 reservation is held, returning" 3829 " RESERVATION_CONFLICT\n"); 3830 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3831 ret = -EINVAL; 3832 goto out; 3833 } 3834 3835 /* 3836 * FIXME: A NULL struct se_session pointer means an this is not coming from 3837 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3838 */ 3839 if (!cmd->se_sess) { 3840 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3841 ret = -EINVAL; 3842 goto out; 3843 } 3844 3845 if (cmd->data_length < 24) { 3846 pr_warn("SPC-PR: Received PR OUT parameter list" 3847 " length too small: %u\n", cmd->data_length); 3848 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3849 ret = -EINVAL; 3850 goto out; 3851 } 3852 /* 3853 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3854 */ 3855 sa = (cdb[1] & 0x1f); 3856 scope = (cdb[2] & 0xf0); 3857 type = (cdb[2] & 0x0f); 3858 3859 buf = transport_kmap_data_sg(cmd); 3860 /* 3861 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3862 */ 3863 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3864 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3865 /* 3866 * REGISTER_AND_MOVE uses a different SA parameter list containing 3867 * SCSI TransportIDs. 3868 */ 3869 if (sa != PRO_REGISTER_AND_MOVE) { 3870 spec_i_pt = (buf[20] & 0x08); 3871 all_tg_pt = (buf[20] & 0x04); 3872 aptpl = (buf[20] & 0x01); 3873 } else { 3874 aptpl = (buf[17] & 0x01); 3875 unreg = (buf[17] & 0x02); 3876 } 3877 transport_kunmap_data_sg(cmd); 3878 buf = NULL; 3879 3880 /* 3881 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3882 */ 3883 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3884 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3885 ret = -EINVAL; 3886 goto out; 3887 } 3888 3889 /* 3890 * From spc4r17 section 6.14: 3891 * 3892 * If the SPEC_I_PT bit is set to zero, the service action is not 3893 * REGISTER AND MOVE, and the parameter list length is not 24, then 3894 * the command shall be terminated with CHECK CONDITION status, with 3895 * the sense key set to ILLEGAL REQUEST, and the additional sense 3896 * code set to PARAMETER LIST LENGTH ERROR. 3897 */ 3898 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3899 (cmd->data_length != 24)) { 3900 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3901 " list length: %u\n", cmd->data_length); 3902 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3903 ret = -EINVAL; 3904 goto out; 3905 } 3906 /* 3907 * (core_scsi3_emulate_pro_* function parameters 3908 * are defined by spc4r17 Table 174: 3909 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3910 */ 3911 switch (sa) { 3912 case PRO_REGISTER: 3913 ret = core_scsi3_emulate_pro_register(cmd, 3914 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3915 break; 3916 case PRO_RESERVE: 3917 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3918 break; 3919 case PRO_RELEASE: 3920 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3921 break; 3922 case PRO_CLEAR: 3923 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3924 break; 3925 case PRO_PREEMPT: 3926 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3927 res_key, sa_res_key, 0); 3928 break; 3929 case PRO_PREEMPT_AND_ABORT: 3930 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3931 res_key, sa_res_key, 1); 3932 break; 3933 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3934 ret = core_scsi3_emulate_pro_register(cmd, 3935 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3936 break; 3937 case PRO_REGISTER_AND_MOVE: 3938 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3939 sa_res_key, aptpl, unreg); 3940 break; 3941 default: 3942 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3943 " action: 0x%02x\n", cdb[1] & 0x1f); 3944 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3945 ret = -EINVAL; 3946 break; 3947 } 3948 3949 out: 3950 if (!ret) 3951 target_complete_cmd(cmd, GOOD); 3952 return ret; 3953 } 3954 3955 /* 3956 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3957 * 3958 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3959 */ 3960 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3961 { 3962 struct se_device *se_dev = cmd->se_dev; 3963 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3964 struct t10_pr_registration *pr_reg; 3965 unsigned char *buf; 3966 u32 add_len = 0, off = 8; 3967 3968 if (cmd->data_length < 8) { 3969 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3970 " too small\n", cmd->data_length); 3971 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3972 return -EINVAL; 3973 } 3974 3975 buf = transport_kmap_data_sg(cmd); 3976 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3977 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3978 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3979 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3980 3981 spin_lock(&su_dev->t10_pr.registration_lock); 3982 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3983 pr_reg_list) { 3984 /* 3985 * Check for overflow of 8byte PRI READ_KEYS payload and 3986 * next reservation key list descriptor. 3987 */ 3988 if ((add_len + 8) > (cmd->data_length - 8)) 3989 break; 3990 3991 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3992 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3993 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3994 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3995 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3996 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3997 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3998 buf[off++] = (pr_reg->pr_res_key & 0xff); 3999 4000 add_len += 8; 4001 } 4002 spin_unlock(&su_dev->t10_pr.registration_lock); 4003 4004 buf[4] = ((add_len >> 24) & 0xff); 4005 buf[5] = ((add_len >> 16) & 0xff); 4006 buf[6] = ((add_len >> 8) & 0xff); 4007 buf[7] = (add_len & 0xff); 4008 4009 transport_kunmap_data_sg(cmd); 4010 4011 return 0; 4012 } 4013 4014 /* 4015 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4016 * 4017 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4018 */ 4019 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4020 { 4021 struct se_device *se_dev = cmd->se_dev; 4022 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4023 struct t10_pr_registration *pr_reg; 4024 unsigned char *buf; 4025 u64 pr_res_key; 4026 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4027 4028 if (cmd->data_length < 8) { 4029 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4030 " too small\n", cmd->data_length); 4031 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4032 return -EINVAL; 4033 } 4034 4035 buf = transport_kmap_data_sg(cmd); 4036 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4037 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4038 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4039 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4040 4041 spin_lock(&se_dev->dev_reservation_lock); 4042 pr_reg = se_dev->dev_pr_res_holder; 4043 if (pr_reg) { 4044 /* 4045 * Set the hardcoded Additional Length 4046 */ 4047 buf[4] = ((add_len >> 24) & 0xff); 4048 buf[5] = ((add_len >> 16) & 0xff); 4049 buf[6] = ((add_len >> 8) & 0xff); 4050 buf[7] = (add_len & 0xff); 4051 4052 if (cmd->data_length < 22) 4053 goto err; 4054 4055 /* 4056 * Set the Reservation key. 4057 * 4058 * From spc4r17, section 5.7.10: 4059 * A persistent reservation holder has its reservation key 4060 * returned in the parameter data from a PERSISTENT 4061 * RESERVE IN command with READ RESERVATION service action as 4062 * follows: 4063 * a) For a persistent reservation of the type Write Exclusive 4064 * - All Registrants or Exclusive Access All Regitrants, 4065 * the reservation key shall be set to zero; or 4066 * b) For all other persistent reservation types, the 4067 * reservation key shall be set to the registered 4068 * reservation key for the I_T nexus that holds the 4069 * persistent reservation. 4070 */ 4071 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4072 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4073 pr_res_key = 0; 4074 else 4075 pr_res_key = pr_reg->pr_res_key; 4076 4077 buf[8] = ((pr_res_key >> 56) & 0xff); 4078 buf[9] = ((pr_res_key >> 48) & 0xff); 4079 buf[10] = ((pr_res_key >> 40) & 0xff); 4080 buf[11] = ((pr_res_key >> 32) & 0xff); 4081 buf[12] = ((pr_res_key >> 24) & 0xff); 4082 buf[13] = ((pr_res_key >> 16) & 0xff); 4083 buf[14] = ((pr_res_key >> 8) & 0xff); 4084 buf[15] = (pr_res_key & 0xff); 4085 /* 4086 * Set the SCOPE and TYPE 4087 */ 4088 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4089 (pr_reg->pr_res_type & 0x0f); 4090 } 4091 4092 err: 4093 spin_unlock(&se_dev->dev_reservation_lock); 4094 transport_kunmap_data_sg(cmd); 4095 4096 return 0; 4097 } 4098 4099 /* 4100 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4101 * 4102 * See spc4r17 section 6.13.4 Table 165 4103 */ 4104 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4105 { 4106 struct se_device *dev = cmd->se_dev; 4107 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4108 unsigned char *buf; 4109 u16 add_len = 8; /* Hardcoded to 8. */ 4110 4111 if (cmd->data_length < 6) { 4112 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4113 " %u too small\n", cmd->data_length); 4114 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4115 return -EINVAL; 4116 } 4117 4118 buf = transport_kmap_data_sg(cmd); 4119 4120 buf[0] = ((add_len << 8) & 0xff); 4121 buf[1] = (add_len & 0xff); 4122 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4123 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4124 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4125 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4126 /* 4127 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4128 * set the TMV: Task Mask Valid bit. 4129 */ 4130 buf[3] |= 0x80; 4131 /* 4132 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4133 */ 4134 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4135 /* 4136 * PTPL_A: Persistence across Target Power Loss Active bit 4137 */ 4138 if (pr_tmpl->pr_aptpl_active) 4139 buf[3] |= 0x01; 4140 /* 4141 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4142 */ 4143 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4144 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4145 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4146 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4147 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4148 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4149 4150 transport_kunmap_data_sg(cmd); 4151 4152 return 0; 4153 } 4154 4155 /* 4156 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4157 * 4158 * See spc4r17 section 6.13.5 Table 168 and 169 4159 */ 4160 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4161 { 4162 struct se_device *se_dev = cmd->se_dev; 4163 struct se_node_acl *se_nacl; 4164 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4165 struct se_portal_group *se_tpg; 4166 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4167 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4168 unsigned char *buf; 4169 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4170 u32 off = 8; /* off into first Full Status descriptor */ 4171 int format_code = 0; 4172 4173 if (cmd->data_length < 8) { 4174 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4175 " too small\n", cmd->data_length); 4176 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4177 return -EINVAL; 4178 } 4179 4180 buf = transport_kmap_data_sg(cmd); 4181 4182 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4183 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4184 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4185 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4186 4187 spin_lock(&pr_tmpl->registration_lock); 4188 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4189 &pr_tmpl->registration_list, pr_reg_list) { 4190 4191 se_nacl = pr_reg->pr_reg_nacl; 4192 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4193 add_desc_len = 0; 4194 4195 atomic_inc(&pr_reg->pr_res_holders); 4196 smp_mb__after_atomic_inc(); 4197 spin_unlock(&pr_tmpl->registration_lock); 4198 /* 4199 * Determine expected length of $FABRIC_MOD specific 4200 * TransportID full status descriptor.. 4201 */ 4202 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4203 se_tpg, se_nacl, pr_reg, &format_code); 4204 4205 if ((exp_desc_len + add_len) > cmd->data_length) { 4206 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4207 " out of buffer: %d\n", cmd->data_length); 4208 spin_lock(&pr_tmpl->registration_lock); 4209 atomic_dec(&pr_reg->pr_res_holders); 4210 smp_mb__after_atomic_dec(); 4211 break; 4212 } 4213 /* 4214 * Set RESERVATION KEY 4215 */ 4216 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4217 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4218 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4219 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4220 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4221 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4222 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4223 buf[off++] = (pr_reg->pr_res_key & 0xff); 4224 off += 4; /* Skip Over Reserved area */ 4225 4226 /* 4227 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4228 */ 4229 if (pr_reg->pr_reg_all_tg_pt) 4230 buf[off] = 0x02; 4231 /* 4232 * The struct se_lun pointer will be present for the 4233 * reservation holder for PR_HOLDER bit. 4234 * 4235 * Also, if this registration is the reservation 4236 * holder, fill in SCOPE and TYPE in the next byte. 4237 */ 4238 if (pr_reg->pr_res_holder) { 4239 buf[off++] |= 0x01; 4240 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4241 (pr_reg->pr_res_type & 0x0f); 4242 } else 4243 off += 2; 4244 4245 off += 4; /* Skip over reserved area */ 4246 /* 4247 * From spc4r17 6.3.15: 4248 * 4249 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4250 * IDENTIFIER field contains the relative port identifier (see 4251 * 3.1.120) of the target port that is part of the I_T nexus 4252 * described by this full status descriptor. If the ALL_TG_PT 4253 * bit is set to one, the contents of the RELATIVE TARGET PORT 4254 * IDENTIFIER field are not defined by this standard. 4255 */ 4256 if (!pr_reg->pr_reg_all_tg_pt) { 4257 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4258 4259 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4260 buf[off++] = (port->sep_rtpi & 0xff); 4261 } else 4262 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4263 4264 /* 4265 * Now, have the $FABRIC_MOD fill in the protocol identifier 4266 */ 4267 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4268 se_nacl, pr_reg, &format_code, &buf[off+4]); 4269 4270 spin_lock(&pr_tmpl->registration_lock); 4271 atomic_dec(&pr_reg->pr_res_holders); 4272 smp_mb__after_atomic_dec(); 4273 /* 4274 * Set the ADDITIONAL DESCRIPTOR LENGTH 4275 */ 4276 buf[off++] = ((desc_len >> 24) & 0xff); 4277 buf[off++] = ((desc_len >> 16) & 0xff); 4278 buf[off++] = ((desc_len >> 8) & 0xff); 4279 buf[off++] = (desc_len & 0xff); 4280 /* 4281 * Size of full desctipor header minus TransportID 4282 * containing $FABRIC_MOD specific) initiator device/port 4283 * WWN information. 4284 * 4285 * See spc4r17 Section 6.13.5 Table 169 4286 */ 4287 add_desc_len = (24 + desc_len); 4288 4289 off += desc_len; 4290 add_len += add_desc_len; 4291 } 4292 spin_unlock(&pr_tmpl->registration_lock); 4293 /* 4294 * Set ADDITIONAL_LENGTH 4295 */ 4296 buf[4] = ((add_len >> 24) & 0xff); 4297 buf[5] = ((add_len >> 16) & 0xff); 4298 buf[6] = ((add_len >> 8) & 0xff); 4299 buf[7] = (add_len & 0xff); 4300 4301 transport_kunmap_data_sg(cmd); 4302 4303 return 0; 4304 } 4305 4306 int target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4307 { 4308 int ret; 4309 4310 /* 4311 * Following spc2r20 5.5.1 Reservations overview: 4312 * 4313 * If a logical unit has been reserved by any RESERVE command and is 4314 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4315 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4316 * initiator or service action and shall terminate with a RESERVATION 4317 * CONFLICT status. 4318 */ 4319 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4320 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4321 " SPC-2 reservation is held, returning" 4322 " RESERVATION_CONFLICT\n"); 4323 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4324 return -EINVAL; 4325 } 4326 4327 switch (cmd->t_task_cdb[1] & 0x1f) { 4328 case PRI_READ_KEYS: 4329 ret = core_scsi3_pri_read_keys(cmd); 4330 break; 4331 case PRI_READ_RESERVATION: 4332 ret = core_scsi3_pri_read_reservation(cmd); 4333 break; 4334 case PRI_REPORT_CAPABILITIES: 4335 ret = core_scsi3_pri_report_capabilities(cmd); 4336 break; 4337 case PRI_READ_FULL_STATUS: 4338 ret = core_scsi3_pri_read_full_status(cmd); 4339 break; 4340 default: 4341 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4342 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4343 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4344 ret = -EINVAL; 4345 break; 4346 } 4347 4348 if (!ret) 4349 target_complete_cmd(cmd, GOOD); 4350 return ret; 4351 } 4352 4353 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4354 { 4355 return 0; 4356 } 4357 4358 static int core_pt_seq_non_holder( 4359 struct se_cmd *cmd, 4360 unsigned char *cdb, 4361 u32 pr_reg_type) 4362 { 4363 return 0; 4364 } 4365 4366 int core_setup_reservations(struct se_device *dev, int force_pt) 4367 { 4368 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4369 struct t10_reservation *rest = &su_dev->t10_pr; 4370 /* 4371 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4372 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4373 * cause a problem because libata and some SATA RAID HBAs appear 4374 * under Linux/SCSI, but to emulate reservations themselves. 4375 */ 4376 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4377 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4378 rest->res_type = SPC_PASSTHROUGH; 4379 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4380 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4381 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4382 " emulation\n", dev->transport->name); 4383 return 0; 4384 } 4385 /* 4386 * If SPC-3 or above is reported by real or emulated struct se_device, 4387 * use emulated Persistent Reservations. 4388 */ 4389 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4390 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4391 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4392 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4393 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4394 " emulation\n", dev->transport->name); 4395 } else { 4396 rest->res_type = SPC2_RESERVATIONS; 4397 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4398 rest->pr_ops.t10_seq_non_holder = 4399 &core_scsi2_reservation_seq_non_holder; 4400 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4401 dev->transport->name); 4402 } 4403 4404 return 0; 4405 } 4406