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 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/vmalloc.h> 31 #include <linux/file.h> 32 #include <linux/fcntl.h> 33 #include <linux/fs.h> 34 #include <scsi/scsi_proto.h> 35 #include <asm/unaligned.h> 36 37 #include <target/target_core_base.h> 38 #include <target/target_core_backend.h> 39 #include <target/target_core_fabric.h> 40 41 #include "target_core_internal.h" 42 #include "target_core_pr.h" 43 #include "target_core_ua.h" 44 45 /* 46 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 47 */ 48 struct pr_transport_id_holder { 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 void 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 buf[0] = '\0'; 63 return; 64 } 65 66 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 67 } 68 69 enum register_type { 70 REGISTER, 71 REGISTER_AND_IGNORE_EXISTING_KEY, 72 REGISTER_AND_MOVE, 73 }; 74 75 enum preempt_type { 76 PREEMPT, 77 PREEMPT_AND_ABORT, 78 }; 79 80 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 81 struct t10_pr_registration *, int, int); 82 83 static int is_reservation_holder( 84 struct t10_pr_registration *pr_res_holder, 85 struct t10_pr_registration *pr_reg) 86 { 87 int pr_res_type; 88 89 if (pr_res_holder) { 90 pr_res_type = pr_res_holder->pr_res_type; 91 92 return pr_res_holder == pr_reg || 93 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 94 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 95 } 96 return 0; 97 } 98 99 static sense_reason_t 100 target_scsi2_reservation_check(struct se_cmd *cmd) 101 { 102 struct se_device *dev = cmd->se_dev; 103 struct se_session *sess = cmd->se_sess; 104 105 switch (cmd->t_task_cdb[0]) { 106 case INQUIRY: 107 case RELEASE: 108 case RELEASE_10: 109 return 0; 110 default: 111 break; 112 } 113 114 if (!dev->dev_reserved_node_acl || !sess) 115 return 0; 116 117 if (dev->dev_reserved_node_acl != sess->se_node_acl) 118 return TCM_RESERVATION_CONFLICT; 119 120 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 121 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 122 return TCM_RESERVATION_CONFLICT; 123 } 124 125 return 0; 126 } 127 128 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 129 struct se_node_acl *, struct se_session *); 130 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 131 132 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 133 { 134 struct se_session *se_sess = cmd->se_sess; 135 struct se_device *dev = cmd->se_dev; 136 struct t10_pr_registration *pr_reg; 137 struct t10_reservation *pr_tmpl = &dev->t10_pr; 138 int conflict = 0; 139 140 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 141 se_sess); 142 if (pr_reg) { 143 /* 144 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 145 * behavior 146 * 147 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 148 * status, but no reservation shall be established and the 149 * persistent reservation shall not be changed, if the command 150 * is received from a) and b) below. 151 * 152 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 153 * status, but the persistent reservation shall not be released, 154 * if the command is received from a) and b) 155 * 156 * a) An I_T nexus that is a persistent reservation holder; or 157 * b) An I_T nexus that is registered if a registrants only or 158 * all registrants type persistent reservation is present. 159 * 160 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 161 * RELEASE(6) command, or RELEASE(10) command shall be processed 162 * as defined in SPC-2. 163 */ 164 if (pr_reg->pr_res_holder) { 165 core_scsi3_put_pr_reg(pr_reg); 166 return 1; 167 } 168 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 169 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 170 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 171 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 172 core_scsi3_put_pr_reg(pr_reg); 173 return 1; 174 } 175 core_scsi3_put_pr_reg(pr_reg); 176 conflict = 1; 177 } else { 178 /* 179 * Following spc2r20 5.5.1 Reservations overview: 180 * 181 * If a logical unit has executed a PERSISTENT RESERVE OUT 182 * command with the REGISTER or the REGISTER AND IGNORE 183 * EXISTING KEY service action and is still registered by any 184 * initiator, all RESERVE commands and all RELEASE commands 185 * regardless of initiator shall conflict and shall terminate 186 * with a RESERVATION CONFLICT status. 187 */ 188 spin_lock(&pr_tmpl->registration_lock); 189 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 190 spin_unlock(&pr_tmpl->registration_lock); 191 } 192 193 if (conflict) { 194 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 195 " while active SPC-3 registrations exist," 196 " returning RESERVATION_CONFLICT\n"); 197 return -EBUSY; 198 } 199 200 return 0; 201 } 202 203 sense_reason_t 204 target_scsi2_reservation_release(struct se_cmd *cmd) 205 { 206 struct se_device *dev = cmd->se_dev; 207 struct se_session *sess = cmd->se_sess; 208 struct se_portal_group *tpg; 209 int rc; 210 211 if (!sess || !sess->se_tpg) 212 goto out; 213 rc = target_check_scsi2_reservation_conflict(cmd); 214 if (rc == 1) 215 goto out; 216 if (rc < 0) 217 return TCM_RESERVATION_CONFLICT; 218 219 spin_lock(&dev->dev_reservation_lock); 220 if (!dev->dev_reserved_node_acl || !sess) 221 goto out_unlock; 222 223 if (dev->dev_reserved_node_acl != sess->se_node_acl) 224 goto out_unlock; 225 226 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 227 goto out_unlock; 228 229 dev->dev_reserved_node_acl = NULL; 230 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 231 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 232 dev->dev_res_bin_isid = 0; 233 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 234 } 235 tpg = sess->se_tpg; 236 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 237 " MAPPED LUN: %llu for %s\n", 238 tpg->se_tpg_tfo->fabric_name, 239 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 240 sess->se_node_acl->initiatorname); 241 242 out_unlock: 243 spin_unlock(&dev->dev_reservation_lock); 244 out: 245 target_complete_cmd(cmd, GOOD); 246 return 0; 247 } 248 249 sense_reason_t 250 target_scsi2_reservation_reserve(struct se_cmd *cmd) 251 { 252 struct se_device *dev = cmd->se_dev; 253 struct se_session *sess = cmd->se_sess; 254 struct se_portal_group *tpg; 255 sense_reason_t ret = 0; 256 int rc; 257 258 if ((cmd->t_task_cdb[1] & 0x01) && 259 (cmd->t_task_cdb[1] & 0x02)) { 260 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 261 return TCM_UNSUPPORTED_SCSI_OPCODE; 262 } 263 /* 264 * This is currently the case for target_core_mod passthrough struct se_cmd 265 * ops 266 */ 267 if (!sess || !sess->se_tpg) 268 goto out; 269 rc = target_check_scsi2_reservation_conflict(cmd); 270 if (rc == 1) 271 goto out; 272 273 if (rc < 0) 274 return TCM_RESERVATION_CONFLICT; 275 276 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->fabric_name); 282 pr_err("Original reserver LUN: %llu %s\n", 283 cmd->se_lun->unpacked_lun, 284 dev->dev_reserved_node_acl->initiatorname); 285 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 286 " from %s \n", cmd->se_lun->unpacked_lun, 287 cmd->orig_fe_lun, 288 sess->se_node_acl->initiatorname); 289 ret = TCM_RESERVATION_CONFLICT; 290 goto out_unlock; 291 } 292 293 dev->dev_reserved_node_acl = sess->se_node_acl; 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 295 if (sess->sess_bin_isid != 0) { 296 dev->dev_res_bin_isid = sess->sess_bin_isid; 297 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 298 } 299 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 300 " for %s\n", tpg->se_tpg_tfo->fabric_name, 301 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 302 sess->se_node_acl->initiatorname); 303 304 out_unlock: 305 spin_unlock(&dev->dev_reservation_lock); 306 out: 307 if (!ret) 308 target_complete_cmd(cmd, GOOD); 309 return ret; 310 } 311 312 313 /* 314 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 315 * 316 * This function is called by those initiator ports who are *NOT* 317 * the active PR reservation holder when a reservation is present. 318 */ 319 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 320 bool isid_mismatch) 321 { 322 unsigned char *cdb = cmd->t_task_cdb; 323 struct se_session *se_sess = cmd->se_sess; 324 struct se_node_acl *nacl = se_sess->se_node_acl; 325 int other_cdb = 0; 326 int registered_nexus = 0, ret = 1; /* Conflict by default */ 327 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 328 int we = 0; /* Write Exclusive */ 329 int legacy = 0; /* Act like a legacy device and return 330 * RESERVATION CONFLICT on some CDBs */ 331 332 if (isid_mismatch) { 333 registered_nexus = 0; 334 } else { 335 struct se_dev_entry *se_deve; 336 337 rcu_read_lock(); 338 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 339 if (se_deve) 340 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 341 &se_deve->deve_flags); 342 rcu_read_unlock(); 343 } 344 345 switch (pr_reg_type) { 346 case PR_TYPE_WRITE_EXCLUSIVE: 347 we = 1; 348 case PR_TYPE_EXCLUSIVE_ACCESS: 349 /* 350 * Some commands are only allowed for the persistent reservation 351 * holder. 352 */ 353 break; 354 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 355 we = 1; 356 /* fall through */ 357 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 358 /* 359 * Some commands are only allowed for registered I_T Nexuses. 360 */ 361 reg_only = 1; 362 break; 363 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 364 we = 1; 365 /* fall through */ 366 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 367 /* 368 * Each registered I_T Nexus is a reservation holder. 369 */ 370 all_reg = 1; 371 break; 372 default: 373 return -EINVAL; 374 } 375 /* 376 * Referenced from spc4r17 table 45 for *NON* PR holder access 377 */ 378 switch (cdb[0]) { 379 case SECURITY_PROTOCOL_IN: 380 if (registered_nexus) 381 return 0; 382 ret = (we) ? 0 : 1; 383 break; 384 case MODE_SENSE: 385 case MODE_SENSE_10: 386 case READ_ATTRIBUTE: 387 case READ_BUFFER: 388 case RECEIVE_DIAGNOSTIC: 389 if (legacy) { 390 ret = 1; 391 break; 392 } 393 if (registered_nexus) { 394 ret = 0; 395 break; 396 } 397 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 398 break; 399 case PERSISTENT_RESERVE_OUT: 400 /* 401 * This follows PERSISTENT_RESERVE_OUT service actions that 402 * are allowed in the presence of various reservations. 403 * See spc4r17, table 46 404 */ 405 switch (cdb[1] & 0x1f) { 406 case PRO_CLEAR: 407 case PRO_PREEMPT: 408 case PRO_PREEMPT_AND_ABORT: 409 ret = (registered_nexus) ? 0 : 1; 410 break; 411 case PRO_REGISTER: 412 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 413 ret = 0; 414 break; 415 case PRO_REGISTER_AND_MOVE: 416 case PRO_RESERVE: 417 ret = 1; 418 break; 419 case PRO_RELEASE: 420 ret = (registered_nexus) ? 0 : 1; 421 break; 422 default: 423 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 424 " action: 0x%02x\n", cdb[1] & 0x1f); 425 return -EINVAL; 426 } 427 break; 428 case RELEASE: 429 case RELEASE_10: 430 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 431 ret = 0; 432 break; 433 case RESERVE: 434 case RESERVE_10: 435 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 436 ret = 0; 437 break; 438 case TEST_UNIT_READY: 439 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 440 break; 441 case MAINTENANCE_IN: 442 switch (cdb[1] & 0x1f) { 443 case MI_MANAGEMENT_PROTOCOL_IN: 444 if (registered_nexus) { 445 ret = 0; 446 break; 447 } 448 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 449 break; 450 case MI_REPORT_SUPPORTED_OPERATION_CODES: 451 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 452 if (legacy) { 453 ret = 1; 454 break; 455 } 456 if (registered_nexus) { 457 ret = 0; 458 break; 459 } 460 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 461 break; 462 case MI_REPORT_ALIASES: 463 case MI_REPORT_IDENTIFYING_INFORMATION: 464 case MI_REPORT_PRIORITY: 465 case MI_REPORT_TARGET_PGS: 466 case MI_REPORT_TIMESTAMP: 467 ret = 0; /* Allowed */ 468 break; 469 default: 470 pr_err("Unknown MI Service Action: 0x%02x\n", 471 (cdb[1] & 0x1f)); 472 return -EINVAL; 473 } 474 break; 475 case ACCESS_CONTROL_IN: 476 case ACCESS_CONTROL_OUT: 477 case INQUIRY: 478 case LOG_SENSE: 479 case SERVICE_ACTION_IN_12: 480 case REPORT_LUNS: 481 case REQUEST_SENSE: 482 case PERSISTENT_RESERVE_IN: 483 ret = 0; /*/ Allowed CDBs */ 484 break; 485 default: 486 other_cdb = 1; 487 break; 488 } 489 /* 490 * Case where the CDB is explicitly allowed in the above switch 491 * statement. 492 */ 493 if (!ret && !other_cdb) { 494 pr_debug("Allowing explicit CDB: 0x%02x for %s" 495 " reservation holder\n", cdb[0], 496 core_scsi3_pr_dump_type(pr_reg_type)); 497 498 return ret; 499 } 500 /* 501 * Check if write exclusive initiator ports *NOT* holding the 502 * WRITE_EXCLUSIVE_* reservation. 503 */ 504 if (we && !registered_nexus) { 505 if (cmd->data_direction == DMA_TO_DEVICE) { 506 /* 507 * Conflict for write exclusive 508 */ 509 pr_debug("%s Conflict for unregistered nexus" 510 " %s CDB: 0x%02x to %s reservation\n", 511 transport_dump_cmd_direction(cmd), 512 se_sess->se_node_acl->initiatorname, cdb[0], 513 core_scsi3_pr_dump_type(pr_reg_type)); 514 return 1; 515 } else { 516 /* 517 * Allow non WRITE CDBs for all Write Exclusive 518 * PR TYPEs to pass for registered and 519 * non-registered_nexuxes NOT holding the reservation. 520 * 521 * We only make noise for the unregisterd nexuses, 522 * as we expect registered non-reservation holding 523 * nexuses to issue CDBs. 524 */ 525 526 if (!registered_nexus) { 527 pr_debug("Allowing implicit CDB: 0x%02x" 528 " for %s reservation on unregistered" 529 " nexus\n", cdb[0], 530 core_scsi3_pr_dump_type(pr_reg_type)); 531 } 532 533 return 0; 534 } 535 } else if ((reg_only) || (all_reg)) { 536 if (registered_nexus) { 537 /* 538 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 539 * allow commands from registered nexuses. 540 */ 541 542 pr_debug("Allowing implicit CDB: 0x%02x for %s" 543 " reservation\n", cdb[0], 544 core_scsi3_pr_dump_type(pr_reg_type)); 545 546 return 0; 547 } 548 } else if (we && registered_nexus) { 549 /* 550 * Reads are allowed for Write Exclusive locks 551 * from all registrants. 552 */ 553 if (cmd->data_direction == DMA_FROM_DEVICE) { 554 pr_debug("Allowing READ CDB: 0x%02x for %s" 555 " reservation\n", cdb[0], 556 core_scsi3_pr_dump_type(pr_reg_type)); 557 558 return 0; 559 } 560 } 561 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 562 " for %s reservation\n", transport_dump_cmd_direction(cmd), 563 (registered_nexus) ? "" : "un", 564 se_sess->se_node_acl->initiatorname, cdb[0], 565 core_scsi3_pr_dump_type(pr_reg_type)); 566 567 return 1; /* Conflict by default */ 568 } 569 570 static sense_reason_t 571 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 572 { 573 struct se_device *dev = cmd->se_dev; 574 struct se_session *sess = cmd->se_sess; 575 u32 pr_reg_type; 576 bool isid_mismatch = false; 577 578 if (!dev->dev_pr_res_holder) 579 return 0; 580 581 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 582 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 583 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 584 goto check_nonholder; 585 586 if (dev->dev_pr_res_holder->isid_present_at_reg) { 587 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 588 sess->sess_bin_isid) { 589 isid_mismatch = true; 590 goto check_nonholder; 591 } 592 } 593 594 return 0; 595 596 check_nonholder: 597 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 598 return TCM_RESERVATION_CONFLICT; 599 return 0; 600 } 601 602 static u32 core_scsi3_pr_generation(struct se_device *dev) 603 { 604 u32 prg; 605 606 /* 607 * PRGeneration field shall contain the value of a 32-bit wrapping 608 * counter mainted by the device server. 609 * 610 * Note that this is done regardless of Active Persist across 611 * Target PowerLoss (APTPL) 612 * 613 * See spc4r17 section 6.3.12 READ_KEYS service action 614 */ 615 spin_lock(&dev->dev_reservation_lock); 616 prg = dev->t10_pr.pr_generation++; 617 spin_unlock(&dev->dev_reservation_lock); 618 619 return prg; 620 } 621 622 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 623 struct se_device *dev, 624 struct se_node_acl *nacl, 625 struct se_lun *lun, 626 struct se_dev_entry *dest_deve, 627 u64 mapped_lun, 628 unsigned char *isid, 629 u64 sa_res_key, 630 int all_tg_pt, 631 int aptpl) 632 { 633 struct t10_pr_registration *pr_reg; 634 635 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 636 if (!pr_reg) { 637 pr_err("Unable to allocate struct t10_pr_registration\n"); 638 return NULL; 639 } 640 641 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 642 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 643 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 644 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 645 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 646 atomic_set(&pr_reg->pr_res_holders, 0); 647 pr_reg->pr_reg_nacl = nacl; 648 /* 649 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 650 * the se_dev_entry->pr_ref will have been already obtained by 651 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 652 * 653 * Otherwise, locate se_dev_entry now and obtain a reference until 654 * registration completes in __core_scsi3_add_registration(). 655 */ 656 if (dest_deve) { 657 pr_reg->pr_reg_deve = dest_deve; 658 } else { 659 rcu_read_lock(); 660 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 661 if (!pr_reg->pr_reg_deve) { 662 rcu_read_unlock(); 663 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 664 nacl->initiatorname, mapped_lun); 665 kmem_cache_free(t10_pr_reg_cache, pr_reg); 666 return NULL; 667 } 668 kref_get(&pr_reg->pr_reg_deve->pr_kref); 669 rcu_read_unlock(); 670 } 671 pr_reg->pr_res_mapped_lun = mapped_lun; 672 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 673 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 674 pr_reg->pr_res_key = sa_res_key; 675 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 676 pr_reg->pr_reg_aptpl = aptpl; 677 /* 678 * If an ISID value for this SCSI Initiator Port exists, 679 * save it to the registration now. 680 */ 681 if (isid != NULL) { 682 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 683 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 684 pr_reg->isid_present_at_reg = 1; 685 } 686 687 return pr_reg; 688 } 689 690 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 691 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 692 693 /* 694 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 695 * modes. 696 */ 697 static struct t10_pr_registration *__core_scsi3_alloc_registration( 698 struct se_device *dev, 699 struct se_node_acl *nacl, 700 struct se_lun *lun, 701 struct se_dev_entry *deve, 702 u64 mapped_lun, 703 unsigned char *isid, 704 u64 sa_res_key, 705 int all_tg_pt, 706 int aptpl) 707 { 708 struct se_dev_entry *deve_tmp; 709 struct se_node_acl *nacl_tmp; 710 struct se_lun_acl *lacl_tmp; 711 struct se_lun *lun_tmp, *next, *dest_lun; 712 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 713 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 714 int ret; 715 /* 716 * Create a registration for the I_T Nexus upon which the 717 * PROUT REGISTER was received. 718 */ 719 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 720 isid, sa_res_key, all_tg_pt, 721 aptpl); 722 if (!pr_reg) 723 return NULL; 724 /* 725 * Return pointer to pr_reg for ALL_TG_PT=0 726 */ 727 if (!all_tg_pt) 728 return pr_reg; 729 /* 730 * Create list of matching SCSI Initiator Port registrations 731 * for ALL_TG_PT=1 732 */ 733 spin_lock(&dev->se_port_lock); 734 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 735 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 736 continue; 737 spin_unlock(&dev->se_port_lock); 738 739 spin_lock(&lun_tmp->lun_deve_lock); 740 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 741 /* 742 * This pointer will be NULL for demo mode MappedLUNs 743 * that have not been make explicit via a ConfigFS 744 * MappedLUN group for the SCSI Initiator Node ACL. 745 */ 746 if (!deve_tmp->se_lun_acl) 747 continue; 748 749 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 750 lockdep_is_held(&lun_tmp->lun_deve_lock)); 751 nacl_tmp = lacl_tmp->se_lun_nacl; 752 /* 753 * Skip the matching struct se_node_acl that is allocated 754 * above.. 755 */ 756 if (nacl == nacl_tmp) 757 continue; 758 /* 759 * Only perform PR registrations for target ports on 760 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 761 * arrived. 762 */ 763 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 764 continue; 765 /* 766 * Look for a matching Initiator Node ACL in ASCII format 767 */ 768 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 769 continue; 770 771 kref_get(&deve_tmp->pr_kref); 772 spin_unlock(&lun_tmp->lun_deve_lock); 773 /* 774 * Grab a configfs group dependency that is released 775 * for the exception path at label out: below, or upon 776 * completion of adding ALL_TG_PT=1 registrations in 777 * __core_scsi3_add_registration() 778 */ 779 ret = core_scsi3_lunacl_depend_item(deve_tmp); 780 if (ret < 0) { 781 pr_err("core_scsi3_lunacl_depend" 782 "_item() failed\n"); 783 percpu_ref_put(&lun_tmp->lun_ref); 784 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 785 goto out; 786 } 787 /* 788 * Located a matching SCSI Initiator Port on a different 789 * port, allocate the pr_reg_atp and attach it to the 790 * pr_reg->pr_reg_atp_list that will be processed once 791 * the original *pr_reg is processed in 792 * __core_scsi3_add_registration() 793 */ 794 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 795 kref_read(&deve_tmp->pr_kref) != 0); 796 797 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 798 nacl_tmp, dest_lun, deve_tmp, 799 deve_tmp->mapped_lun, NULL, 800 sa_res_key, all_tg_pt, aptpl); 801 if (!pr_reg_atp) { 802 percpu_ref_put(&lun_tmp->lun_ref); 803 core_scsi3_lunacl_undepend_item(deve_tmp); 804 goto out; 805 } 806 807 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 808 &pr_reg->pr_reg_atp_list); 809 spin_lock(&lun_tmp->lun_deve_lock); 810 } 811 spin_unlock(&lun_tmp->lun_deve_lock); 812 813 spin_lock(&dev->se_port_lock); 814 percpu_ref_put(&lun_tmp->lun_ref); 815 } 816 spin_unlock(&dev->se_port_lock); 817 818 return pr_reg; 819 out: 820 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 821 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 822 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 823 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 824 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 825 } 826 kmem_cache_free(t10_pr_reg_cache, pr_reg); 827 return NULL; 828 } 829 830 int core_scsi3_alloc_aptpl_registration( 831 struct t10_reservation *pr_tmpl, 832 u64 sa_res_key, 833 unsigned char *i_port, 834 unsigned char *isid, 835 u64 mapped_lun, 836 unsigned char *t_port, 837 u16 tpgt, 838 u64 target_lun, 839 int res_holder, 840 int all_tg_pt, 841 u8 type) 842 { 843 struct t10_pr_registration *pr_reg; 844 845 if (!i_port || !t_port || !sa_res_key) { 846 pr_err("Illegal parameters for APTPL registration\n"); 847 return -EINVAL; 848 } 849 850 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 851 if (!pr_reg) { 852 pr_err("Unable to allocate struct t10_pr_registration\n"); 853 return -ENOMEM; 854 } 855 856 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 857 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 858 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 859 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 860 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 861 atomic_set(&pr_reg->pr_res_holders, 0); 862 pr_reg->pr_reg_nacl = NULL; 863 pr_reg->pr_reg_deve = NULL; 864 pr_reg->pr_res_mapped_lun = mapped_lun; 865 pr_reg->pr_aptpl_target_lun = target_lun; 866 pr_reg->pr_res_key = sa_res_key; 867 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 868 pr_reg->pr_reg_aptpl = 1; 869 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 870 pr_reg->pr_res_type = type; 871 /* 872 * If an ISID value had been saved in APTPL metadata for this 873 * SCSI Initiator Port, restore it now. 874 */ 875 if (isid != NULL) { 876 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 877 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 878 pr_reg->isid_present_at_reg = 1; 879 } 880 /* 881 * Copy the i_port and t_port information from caller. 882 */ 883 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 884 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 885 pr_reg->pr_reg_tpgt = tpgt; 886 /* 887 * Set pr_res_holder from caller, the pr_reg who is the reservation 888 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 889 * the Initiator Node LUN ACL from the fabric module is created for 890 * this registration. 891 */ 892 pr_reg->pr_res_holder = res_holder; 893 894 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 895 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 896 " metadata\n", (res_holder) ? "+reservation" : ""); 897 return 0; 898 } 899 900 static void core_scsi3_aptpl_reserve( 901 struct se_device *dev, 902 struct se_portal_group *tpg, 903 struct se_node_acl *node_acl, 904 struct t10_pr_registration *pr_reg) 905 { 906 char i_buf[PR_REG_ISID_ID_LEN]; 907 908 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 909 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 910 911 spin_lock(&dev->dev_reservation_lock); 912 dev->dev_pr_res_holder = pr_reg; 913 spin_unlock(&dev->dev_reservation_lock); 914 915 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 916 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 917 tpg->se_tpg_tfo->fabric_name, 918 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 919 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 920 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 921 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname, 922 i_buf); 923 } 924 925 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 926 struct t10_pr_registration *, enum register_type, int); 927 928 static int __core_scsi3_check_aptpl_registration( 929 struct se_device *dev, 930 struct se_portal_group *tpg, 931 struct se_lun *lun, 932 u64 target_lun, 933 struct se_node_acl *nacl, 934 u64 mapped_lun) 935 { 936 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 937 struct t10_reservation *pr_tmpl = &dev->t10_pr; 938 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 939 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 940 u16 tpgt; 941 942 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 943 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 944 /* 945 * Copy Initiator Port information from struct se_node_acl 946 */ 947 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 948 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 949 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 950 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 951 /* 952 * Look for the matching registrations+reservation from those 953 * created from APTPL metadata. Note that multiple registrations 954 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 955 * TransportIDs. 956 */ 957 spin_lock(&pr_tmpl->aptpl_reg_lock); 958 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 959 pr_reg_aptpl_list) { 960 961 if (!strcmp(pr_reg->pr_iport, i_port) && 962 (pr_reg->pr_res_mapped_lun == mapped_lun) && 963 !(strcmp(pr_reg->pr_tport, t_port)) && 964 (pr_reg->pr_reg_tpgt == tpgt) && 965 (pr_reg->pr_aptpl_target_lun == target_lun)) { 966 /* 967 * Obtain the ->pr_reg_deve pointer + reference, that 968 * is released by __core_scsi3_add_registration() below. 969 */ 970 rcu_read_lock(); 971 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 972 if (!pr_reg->pr_reg_deve) { 973 pr_err("Unable to locate PR APTPL %s mapped_lun:" 974 " %llu\n", nacl->initiatorname, mapped_lun); 975 rcu_read_unlock(); 976 continue; 977 } 978 kref_get(&pr_reg->pr_reg_deve->pr_kref); 979 rcu_read_unlock(); 980 981 pr_reg->pr_reg_nacl = nacl; 982 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 983 list_del(&pr_reg->pr_reg_aptpl_list); 984 spin_unlock(&pr_tmpl->aptpl_reg_lock); 985 /* 986 * At this point all of the pointers in *pr_reg will 987 * be setup, so go ahead and add the registration. 988 */ 989 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 990 /* 991 * If this registration is the reservation holder, 992 * make that happen now.. 993 */ 994 if (pr_reg->pr_res_holder) 995 core_scsi3_aptpl_reserve(dev, tpg, 996 nacl, pr_reg); 997 /* 998 * Reenable pr_aptpl_active to accept new metadata 999 * updates once the SCSI device is active again.. 1000 */ 1001 spin_lock(&pr_tmpl->aptpl_reg_lock); 1002 pr_tmpl->pr_aptpl_active = 1; 1003 } 1004 } 1005 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1006 1007 return 0; 1008 } 1009 1010 int core_scsi3_check_aptpl_registration( 1011 struct se_device *dev, 1012 struct se_portal_group *tpg, 1013 struct se_lun *lun, 1014 struct se_node_acl *nacl, 1015 u64 mapped_lun) 1016 { 1017 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1018 return 0; 1019 1020 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1021 lun->unpacked_lun, nacl, 1022 mapped_lun); 1023 } 1024 1025 static void __core_scsi3_dump_registration( 1026 const struct target_core_fabric_ops *tfo, 1027 struct se_device *dev, 1028 struct se_node_acl *nacl, 1029 struct t10_pr_registration *pr_reg, 1030 enum register_type register_type) 1031 { 1032 struct se_portal_group *se_tpg = nacl->se_tpg; 1033 char i_buf[PR_REG_ISID_ID_LEN]; 1034 1035 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1036 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1037 1038 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1039 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ? 1040 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1041 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1042 i_buf); 1043 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1044 tfo->fabric_name, tfo->tpg_get_wwn(se_tpg), 1045 tfo->tpg_get_tag(se_tpg)); 1046 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1047 " Port(s)\n", tfo->fabric_name, 1048 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1049 dev->transport->name); 1050 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1051 " 0x%08x APTPL: %d\n", tfo->fabric_name, 1052 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1053 pr_reg->pr_reg_aptpl); 1054 } 1055 1056 static void __core_scsi3_add_registration( 1057 struct se_device *dev, 1058 struct se_node_acl *nacl, 1059 struct t10_pr_registration *pr_reg, 1060 enum register_type register_type, 1061 int register_move) 1062 { 1063 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1064 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1065 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1066 struct se_dev_entry *deve; 1067 1068 /* 1069 * Increment PRgeneration counter for struct se_device upon a successful 1070 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1071 * 1072 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1073 * action, the struct se_device->dev_reservation_lock will already be held, 1074 * so we do not call core_scsi3_pr_generation() which grabs the lock 1075 * for the REGISTER. 1076 */ 1077 pr_reg->pr_res_generation = (register_move) ? 1078 dev->t10_pr.pr_generation++ : 1079 core_scsi3_pr_generation(dev); 1080 1081 spin_lock(&pr_tmpl->registration_lock); 1082 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1083 1084 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1085 spin_unlock(&pr_tmpl->registration_lock); 1086 /* 1087 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1088 */ 1089 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1090 goto out; 1091 /* 1092 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1093 * allocated in __core_scsi3_alloc_registration() 1094 */ 1095 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1096 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1097 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1098 1099 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1100 1101 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1102 1103 spin_lock(&pr_tmpl->registration_lock); 1104 list_add_tail(&pr_reg_tmp->pr_reg_list, 1105 &pr_tmpl->registration_list); 1106 1107 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1108 register_type); 1109 spin_unlock(&pr_tmpl->registration_lock); 1110 /* 1111 * Drop configfs group dependency reference and deve->pr_kref 1112 * obtained from __core_scsi3_alloc_registration() code. 1113 */ 1114 rcu_read_lock(); 1115 deve = pr_reg_tmp->pr_reg_deve; 1116 if (deve) { 1117 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1118 core_scsi3_lunacl_undepend_item(deve); 1119 pr_reg_tmp->pr_reg_deve = NULL; 1120 } 1121 rcu_read_unlock(); 1122 } 1123 out: 1124 /* 1125 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1126 */ 1127 rcu_read_lock(); 1128 deve = pr_reg->pr_reg_deve; 1129 if (deve) { 1130 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1131 kref_put(&deve->pr_kref, target_pr_kref_release); 1132 pr_reg->pr_reg_deve = NULL; 1133 } 1134 rcu_read_unlock(); 1135 } 1136 1137 static int core_scsi3_alloc_registration( 1138 struct se_device *dev, 1139 struct se_node_acl *nacl, 1140 struct se_lun *lun, 1141 struct se_dev_entry *deve, 1142 u64 mapped_lun, 1143 unsigned char *isid, 1144 u64 sa_res_key, 1145 int all_tg_pt, 1146 int aptpl, 1147 enum register_type register_type, 1148 int register_move) 1149 { 1150 struct t10_pr_registration *pr_reg; 1151 1152 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1153 isid, sa_res_key, all_tg_pt, 1154 aptpl); 1155 if (!pr_reg) 1156 return -EPERM; 1157 1158 __core_scsi3_add_registration(dev, nacl, pr_reg, 1159 register_type, register_move); 1160 return 0; 1161 } 1162 1163 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1164 struct se_device *dev, 1165 struct se_node_acl *nacl, 1166 unsigned char *isid) 1167 { 1168 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1169 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1170 struct se_portal_group *tpg; 1171 1172 spin_lock(&pr_tmpl->registration_lock); 1173 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1174 &pr_tmpl->registration_list, pr_reg_list) { 1175 /* 1176 * First look for a matching struct se_node_acl 1177 */ 1178 if (pr_reg->pr_reg_nacl != nacl) 1179 continue; 1180 1181 tpg = pr_reg->pr_reg_nacl->se_tpg; 1182 /* 1183 * If this registration does NOT contain a fabric provided 1184 * ISID, then we have found a match. 1185 */ 1186 if (!pr_reg->isid_present_at_reg) { 1187 /* 1188 * Determine if this SCSI device server requires that 1189 * SCSI Intiatior TransportID w/ ISIDs is enforced 1190 * for fabric modules (iSCSI) requiring them. 1191 */ 1192 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1193 if (dev->dev_attrib.enforce_pr_isids) 1194 continue; 1195 } 1196 atomic_inc_mb(&pr_reg->pr_res_holders); 1197 spin_unlock(&pr_tmpl->registration_lock); 1198 return pr_reg; 1199 } 1200 /* 1201 * If the *pr_reg contains a fabric defined ISID for multi-value 1202 * SCSI Initiator Port TransportIDs, then we expect a valid 1203 * matching ISID to be provided by the local SCSI Initiator Port. 1204 */ 1205 if (!isid) 1206 continue; 1207 if (strcmp(isid, pr_reg->pr_reg_isid)) 1208 continue; 1209 1210 atomic_inc_mb(&pr_reg->pr_res_holders); 1211 spin_unlock(&pr_tmpl->registration_lock); 1212 return pr_reg; 1213 } 1214 spin_unlock(&pr_tmpl->registration_lock); 1215 1216 return NULL; 1217 } 1218 1219 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1220 struct se_device *dev, 1221 struct se_node_acl *nacl, 1222 struct se_session *sess) 1223 { 1224 struct se_portal_group *tpg = nacl->se_tpg; 1225 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1226 1227 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1228 memset(&buf[0], 0, PR_REG_ISID_LEN); 1229 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1230 PR_REG_ISID_LEN); 1231 isid_ptr = &buf[0]; 1232 } 1233 1234 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1235 } 1236 1237 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1238 { 1239 atomic_dec_mb(&pr_reg->pr_res_holders); 1240 } 1241 1242 static int core_scsi3_check_implicit_release( 1243 struct se_device *dev, 1244 struct t10_pr_registration *pr_reg) 1245 { 1246 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1247 struct t10_pr_registration *pr_res_holder; 1248 int ret = 0; 1249 1250 spin_lock(&dev->dev_reservation_lock); 1251 pr_res_holder = dev->dev_pr_res_holder; 1252 if (!pr_res_holder) { 1253 spin_unlock(&dev->dev_reservation_lock); 1254 return ret; 1255 } 1256 if (pr_res_holder == pr_reg) { 1257 /* 1258 * Perform an implicit RELEASE if the registration that 1259 * is being released is holding the reservation. 1260 * 1261 * From spc4r17, section 5.7.11.1: 1262 * 1263 * e) If the I_T nexus is the persistent reservation holder 1264 * and the persistent reservation is not an all registrants 1265 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1266 * service action or REGISTER AND IGNORE EXISTING KEY 1267 * service action with the SERVICE ACTION RESERVATION KEY 1268 * field set to zero (see 5.7.11.3). 1269 */ 1270 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1271 ret = 1; 1272 /* 1273 * For 'All Registrants' reservation types, all existing 1274 * registrations are still processed as reservation holders 1275 * in core_scsi3_pr_seq_non_holder() after the initial 1276 * reservation holder is implicitly released here. 1277 */ 1278 } else if (pr_reg->pr_reg_all_tg_pt && 1279 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1280 pr_reg->pr_reg_nacl->initiatorname)) && 1281 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1282 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1283 " UNREGISTER while existing reservation with matching" 1284 " key 0x%016Lx is present from another SCSI Initiator" 1285 " Port\n", pr_reg->pr_res_key); 1286 ret = -EPERM; 1287 } 1288 spin_unlock(&dev->dev_reservation_lock); 1289 1290 return ret; 1291 } 1292 1293 static void __core_scsi3_free_registration( 1294 struct se_device *dev, 1295 struct t10_pr_registration *pr_reg, 1296 struct list_head *preempt_and_abort_list, 1297 int dec_holders) 1298 __releases(&pr_tmpl->registration_lock) 1299 __acquires(&pr_tmpl->registration_lock) 1300 { 1301 const struct target_core_fabric_ops *tfo = 1302 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1303 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1304 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1305 struct se_dev_entry *deve; 1306 char i_buf[PR_REG_ISID_ID_LEN]; 1307 1308 lockdep_assert_held(&pr_tmpl->registration_lock); 1309 1310 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1311 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1312 1313 if (!list_empty(&pr_reg->pr_reg_list)) 1314 list_del(&pr_reg->pr_reg_list); 1315 /* 1316 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1317 * so call core_scsi3_put_pr_reg() to decrement our reference. 1318 */ 1319 if (dec_holders) 1320 core_scsi3_put_pr_reg(pr_reg); 1321 1322 spin_unlock(&pr_tmpl->registration_lock); 1323 /* 1324 * Wait until all reference from any other I_T nexuses for this 1325 * *pr_reg have been released. Because list_del() is called above, 1326 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1327 * count back to zero, and we release *pr_reg. 1328 */ 1329 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1330 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1331 tfo->fabric_name); 1332 cpu_relax(); 1333 } 1334 1335 rcu_read_lock(); 1336 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1337 if (deve) 1338 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1339 rcu_read_unlock(); 1340 1341 spin_lock(&pr_tmpl->registration_lock); 1342 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1343 " Node: %s%s\n", tfo->fabric_name, 1344 pr_reg->pr_reg_nacl->initiatorname, 1345 i_buf); 1346 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1347 " Port(s)\n", tfo->fabric_name, 1348 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1349 dev->transport->name); 1350 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1351 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, 1352 pr_reg->pr_res_generation); 1353 1354 if (!preempt_and_abort_list) { 1355 pr_reg->pr_reg_deve = NULL; 1356 pr_reg->pr_reg_nacl = NULL; 1357 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1358 return; 1359 } 1360 /* 1361 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1362 * are released once the ABORT_TASK_SET has completed.. 1363 */ 1364 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1365 } 1366 1367 void core_scsi3_free_pr_reg_from_nacl( 1368 struct se_device *dev, 1369 struct se_node_acl *nacl) 1370 { 1371 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1372 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1373 bool free_reg = false; 1374 /* 1375 * If the passed se_node_acl matches the reservation holder, 1376 * release the reservation. 1377 */ 1378 spin_lock(&dev->dev_reservation_lock); 1379 pr_res_holder = dev->dev_pr_res_holder; 1380 if ((pr_res_holder != NULL) && 1381 (pr_res_holder->pr_reg_nacl == nacl)) { 1382 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1383 free_reg = true; 1384 } 1385 spin_unlock(&dev->dev_reservation_lock); 1386 /* 1387 * Release any registration associated with the struct se_node_acl. 1388 */ 1389 spin_lock(&pr_tmpl->registration_lock); 1390 if (pr_res_holder && free_reg) 1391 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1392 1393 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1394 &pr_tmpl->registration_list, pr_reg_list) { 1395 1396 if (pr_reg->pr_reg_nacl != nacl) 1397 continue; 1398 1399 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1400 } 1401 spin_unlock(&pr_tmpl->registration_lock); 1402 } 1403 1404 void core_scsi3_free_all_registrations( 1405 struct se_device *dev) 1406 { 1407 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1408 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1409 1410 spin_lock(&dev->dev_reservation_lock); 1411 pr_res_holder = dev->dev_pr_res_holder; 1412 if (pr_res_holder != NULL) { 1413 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1414 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1415 pr_res_holder, 0, 0); 1416 } 1417 spin_unlock(&dev->dev_reservation_lock); 1418 1419 spin_lock(&pr_tmpl->registration_lock); 1420 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1421 &pr_tmpl->registration_list, pr_reg_list) { 1422 1423 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1424 } 1425 spin_unlock(&pr_tmpl->registration_lock); 1426 1427 spin_lock(&pr_tmpl->aptpl_reg_lock); 1428 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1429 pr_reg_aptpl_list) { 1430 list_del(&pr_reg->pr_reg_aptpl_list); 1431 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1432 } 1433 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1434 } 1435 1436 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1437 { 1438 return target_depend_item(&tpg->tpg_group.cg_item); 1439 } 1440 1441 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1442 { 1443 target_undepend_item(&tpg->tpg_group.cg_item); 1444 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1445 } 1446 1447 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1448 { 1449 if (nacl->dynamic_node_acl) 1450 return 0; 1451 return target_depend_item(&nacl->acl_group.cg_item); 1452 } 1453 1454 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1455 { 1456 if (!nacl->dynamic_node_acl) 1457 target_undepend_item(&nacl->acl_group.cg_item); 1458 atomic_dec_mb(&nacl->acl_pr_ref_count); 1459 } 1460 1461 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1462 { 1463 struct se_lun_acl *lun_acl; 1464 1465 /* 1466 * For nacl->dynamic_node_acl=1 1467 */ 1468 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1469 kref_read(&se_deve->pr_kref) != 0); 1470 if (!lun_acl) 1471 return 0; 1472 1473 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1474 } 1475 1476 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1477 { 1478 struct se_lun_acl *lun_acl; 1479 1480 /* 1481 * For nacl->dynamic_node_acl=1 1482 */ 1483 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1484 kref_read(&se_deve->pr_kref) != 0); 1485 if (!lun_acl) { 1486 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1487 return; 1488 } 1489 1490 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1491 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1492 } 1493 1494 static sense_reason_t 1495 core_scsi3_decode_spec_i_port( 1496 struct se_cmd *cmd, 1497 struct se_portal_group *tpg, 1498 unsigned char *l_isid, 1499 u64 sa_res_key, 1500 int all_tg_pt, 1501 int aptpl) 1502 { 1503 struct se_device *dev = cmd->se_dev; 1504 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1505 struct se_session *se_sess = cmd->se_sess; 1506 struct se_node_acl *dest_node_acl = NULL; 1507 struct se_dev_entry *dest_se_deve = NULL; 1508 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1509 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1510 LIST_HEAD(tid_dest_list); 1511 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1512 unsigned char *buf, *ptr, proto_ident; 1513 const unsigned char *i_str = NULL; 1514 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1515 sense_reason_t ret; 1516 u32 tpdl, tid_len = 0; 1517 u32 dest_rtpi = 0; 1518 1519 /* 1520 * Allocate a struct pr_transport_id_holder and setup the 1521 * local_node_acl pointer and add to struct list_head tid_dest_list 1522 * for add registration processing in the loop of tid_dest_list below. 1523 */ 1524 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1525 if (!tidh_new) { 1526 pr_err("Unable to allocate tidh_new\n"); 1527 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1528 } 1529 INIT_LIST_HEAD(&tidh_new->dest_list); 1530 tidh_new->dest_tpg = tpg; 1531 tidh_new->dest_node_acl = se_sess->se_node_acl; 1532 1533 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1534 se_sess->se_node_acl, cmd->se_lun, 1535 NULL, cmd->orig_fe_lun, l_isid, 1536 sa_res_key, all_tg_pt, aptpl); 1537 if (!local_pr_reg) { 1538 kfree(tidh_new); 1539 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1540 } 1541 tidh_new->dest_pr_reg = local_pr_reg; 1542 /* 1543 * The local I_T nexus does not hold any configfs dependances, 1544 * so we set tidh_new->dest_se_deve to NULL to prevent the 1545 * configfs_undepend_item() calls in the tid_dest_list loops below. 1546 */ 1547 tidh_new->dest_se_deve = NULL; 1548 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1549 1550 if (cmd->data_length < 28) { 1551 pr_warn("SPC-PR: Received PR OUT parameter list" 1552 " length too small: %u\n", cmd->data_length); 1553 ret = TCM_INVALID_PARAMETER_LIST; 1554 goto out; 1555 } 1556 1557 buf = transport_kmap_data_sg(cmd); 1558 if (!buf) { 1559 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1560 goto out; 1561 } 1562 1563 /* 1564 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1565 * first extract TransportID Parameter Data Length, and make sure 1566 * the value matches up to the SCSI expected data transfer length. 1567 */ 1568 tpdl = get_unaligned_be32(&buf[24]); 1569 1570 if ((tpdl + 28) != cmd->data_length) { 1571 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1572 " does not equal CDB data_length: %u\n", tpdl, 1573 cmd->data_length); 1574 ret = TCM_INVALID_PARAMETER_LIST; 1575 goto out_unmap; 1576 } 1577 /* 1578 * Start processing the received transport IDs using the 1579 * receiving I_T Nexus portal's fabric dependent methods to 1580 * obtain the SCSI Initiator Port/Device Identifiers. 1581 */ 1582 ptr = &buf[28]; 1583 1584 while (tpdl > 0) { 1585 struct se_lun *dest_lun, *tmp_lun; 1586 1587 proto_ident = (ptr[0] & 0x0f); 1588 dest_tpg = NULL; 1589 1590 spin_lock(&dev->se_port_lock); 1591 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1592 tmp_tpg = tmp_lun->lun_tpg; 1593 1594 /* 1595 * Look for the matching proto_ident provided by 1596 * the received TransportID 1597 */ 1598 if (tmp_tpg->proto_id != proto_ident) 1599 continue; 1600 dest_rtpi = tmp_lun->lun_rtpi; 1601 1602 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1603 ptr, &tid_len, &iport_ptr); 1604 if (!i_str) 1605 continue; 1606 1607 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1608 spin_unlock(&dev->se_port_lock); 1609 1610 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1611 pr_err(" core_scsi3_tpg_depend_item()" 1612 " for tmp_tpg\n"); 1613 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1614 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1615 goto out_unmap; 1616 } 1617 /* 1618 * Locate the destination initiator ACL to be registered 1619 * from the decoded fabric module specific TransportID 1620 * at *i_str. 1621 */ 1622 mutex_lock(&tmp_tpg->acl_node_mutex); 1623 dest_node_acl = __core_tpg_get_initiator_node_acl( 1624 tmp_tpg, i_str); 1625 if (dest_node_acl) 1626 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1627 mutex_unlock(&tmp_tpg->acl_node_mutex); 1628 1629 if (!dest_node_acl) { 1630 core_scsi3_tpg_undepend_item(tmp_tpg); 1631 spin_lock(&dev->se_port_lock); 1632 continue; 1633 } 1634 1635 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1636 pr_err("configfs_depend_item() failed" 1637 " for dest_node_acl->acl_group\n"); 1638 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1639 core_scsi3_tpg_undepend_item(tmp_tpg); 1640 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1641 goto out_unmap; 1642 } 1643 1644 dest_tpg = tmp_tpg; 1645 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1646 " %s Port RTPI: %hu\n", 1647 dest_tpg->se_tpg_tfo->fabric_name, 1648 dest_node_acl->initiatorname, dest_rtpi); 1649 1650 spin_lock(&dev->se_port_lock); 1651 break; 1652 } 1653 spin_unlock(&dev->se_port_lock); 1654 1655 if (!dest_tpg) { 1656 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1657 " dest_tpg\n"); 1658 ret = TCM_INVALID_PARAMETER_LIST; 1659 goto out_unmap; 1660 } 1661 1662 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1663 " tid_len: %d for %s + %s\n", 1664 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, 1665 tpdl, tid_len, i_str, iport_ptr); 1666 1667 if (tid_len > tpdl) { 1668 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1669 " %u for Transport ID: %s\n", tid_len, ptr); 1670 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1671 core_scsi3_tpg_undepend_item(dest_tpg); 1672 ret = TCM_INVALID_PARAMETER_LIST; 1673 goto out_unmap; 1674 } 1675 /* 1676 * Locate the desintation struct se_dev_entry pointer for matching 1677 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1678 * Target Port. 1679 */ 1680 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1681 dest_rtpi); 1682 if (!dest_se_deve) { 1683 pr_err("Unable to locate %s dest_se_deve" 1684 " from destination RTPI: %hu\n", 1685 dest_tpg->se_tpg_tfo->fabric_name, 1686 dest_rtpi); 1687 1688 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1689 core_scsi3_tpg_undepend_item(dest_tpg); 1690 ret = TCM_INVALID_PARAMETER_LIST; 1691 goto out_unmap; 1692 } 1693 1694 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1695 pr_err("core_scsi3_lunacl_depend_item()" 1696 " failed\n"); 1697 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1698 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1699 core_scsi3_tpg_undepend_item(dest_tpg); 1700 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1701 goto out_unmap; 1702 } 1703 1704 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1705 " dest_se_deve mapped_lun: %llu\n", 1706 dest_tpg->se_tpg_tfo->fabric_name, 1707 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1708 1709 /* 1710 * Skip any TransportIDs that already have a registration for 1711 * this target port. 1712 */ 1713 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1714 iport_ptr); 1715 if (pr_reg_e) { 1716 core_scsi3_put_pr_reg(pr_reg_e); 1717 core_scsi3_lunacl_undepend_item(dest_se_deve); 1718 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1719 core_scsi3_tpg_undepend_item(dest_tpg); 1720 ptr += tid_len; 1721 tpdl -= tid_len; 1722 tid_len = 0; 1723 continue; 1724 } 1725 /* 1726 * Allocate a struct pr_transport_id_holder and setup 1727 * the dest_node_acl and dest_se_deve pointers for the 1728 * loop below. 1729 */ 1730 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1731 GFP_KERNEL); 1732 if (!tidh_new) { 1733 pr_err("Unable to allocate tidh_new\n"); 1734 core_scsi3_lunacl_undepend_item(dest_se_deve); 1735 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1736 core_scsi3_tpg_undepend_item(dest_tpg); 1737 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1738 goto out_unmap; 1739 } 1740 INIT_LIST_HEAD(&tidh_new->dest_list); 1741 tidh_new->dest_tpg = dest_tpg; 1742 tidh_new->dest_node_acl = dest_node_acl; 1743 tidh_new->dest_se_deve = dest_se_deve; 1744 1745 /* 1746 * Allocate, but do NOT add the registration for the 1747 * TransportID referenced SCSI Initiator port. This 1748 * done because of the following from spc4r17 in section 1749 * 6.14.3 wrt SPEC_I_PT: 1750 * 1751 * "If a registration fails for any initiator port (e.g., if th 1752 * logical unit does not have enough resources available to 1753 * hold the registration information), no registrations shall be 1754 * made, and the command shall be terminated with 1755 * CHECK CONDITION status." 1756 * 1757 * That means we call __core_scsi3_alloc_registration() here, 1758 * and then call __core_scsi3_add_registration() in the 1759 * 2nd loop which will never fail. 1760 */ 1761 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1762 kref_read(&dest_se_deve->pr_kref) != 0); 1763 1764 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1765 dest_node_acl, dest_lun, dest_se_deve, 1766 dest_se_deve->mapped_lun, iport_ptr, 1767 sa_res_key, all_tg_pt, aptpl); 1768 if (!dest_pr_reg) { 1769 core_scsi3_lunacl_undepend_item(dest_se_deve); 1770 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1771 core_scsi3_tpg_undepend_item(dest_tpg); 1772 kfree(tidh_new); 1773 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1774 goto out_unmap; 1775 } 1776 tidh_new->dest_pr_reg = dest_pr_reg; 1777 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1778 1779 ptr += tid_len; 1780 tpdl -= tid_len; 1781 tid_len = 0; 1782 1783 } 1784 1785 transport_kunmap_data_sg(cmd); 1786 1787 /* 1788 * Go ahead and create a registrations from tid_dest_list for the 1789 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1790 * and dest_se_deve. 1791 * 1792 * The SA Reservation Key from the PROUT is set for the 1793 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1794 * means that the TransportID Initiator port will be 1795 * registered on all of the target ports in the SCSI target device 1796 * ALL_TG_PT=0 means the registration will only be for the 1797 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1798 * was received. 1799 */ 1800 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1801 dest_tpg = tidh->dest_tpg; 1802 dest_node_acl = tidh->dest_node_acl; 1803 dest_se_deve = tidh->dest_se_deve; 1804 dest_pr_reg = tidh->dest_pr_reg; 1805 1806 list_del(&tidh->dest_list); 1807 kfree(tidh); 1808 1809 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1810 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1811 1812 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1813 dest_pr_reg, 0, 0); 1814 1815 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1816 " registered Transport ID for Node: %s%s Mapped LUN:" 1817 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, 1818 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1819 dest_se_deve->mapped_lun : 0); 1820 1821 if (!dest_se_deve) { 1822 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1823 target_pr_kref_release); 1824 continue; 1825 } 1826 core_scsi3_lunacl_undepend_item(dest_se_deve); 1827 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1828 core_scsi3_tpg_undepend_item(dest_tpg); 1829 } 1830 1831 return 0; 1832 out_unmap: 1833 transport_kunmap_data_sg(cmd); 1834 out: 1835 /* 1836 * For the failure case, release everything from tid_dest_list 1837 * including *dest_pr_reg and the configfs dependances.. 1838 */ 1839 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1840 dest_tpg = tidh->dest_tpg; 1841 dest_node_acl = tidh->dest_node_acl; 1842 dest_se_deve = tidh->dest_se_deve; 1843 dest_pr_reg = tidh->dest_pr_reg; 1844 1845 list_del(&tidh->dest_list); 1846 kfree(tidh); 1847 /* 1848 * Release any extra ALL_TG_PT=1 registrations for 1849 * the SPEC_I_PT=1 case. 1850 */ 1851 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1852 &dest_pr_reg->pr_reg_atp_list, 1853 pr_reg_atp_mem_list) { 1854 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1855 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1856 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1857 } 1858 1859 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1860 1861 if (!dest_se_deve) { 1862 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1863 target_pr_kref_release); 1864 continue; 1865 } 1866 core_scsi3_lunacl_undepend_item(dest_se_deve); 1867 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1868 core_scsi3_tpg_undepend_item(dest_tpg); 1869 } 1870 return ret; 1871 } 1872 1873 static int core_scsi3_update_aptpl_buf( 1874 struct se_device *dev, 1875 unsigned char *buf, 1876 u32 pr_aptpl_buf_len) 1877 { 1878 struct se_portal_group *tpg; 1879 struct t10_pr_registration *pr_reg; 1880 unsigned char tmp[512], isid_buf[32]; 1881 ssize_t len = 0; 1882 int reg_count = 0; 1883 int ret = 0; 1884 1885 spin_lock(&dev->dev_reservation_lock); 1886 spin_lock(&dev->t10_pr.registration_lock); 1887 /* 1888 * Walk the registration list.. 1889 */ 1890 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1891 pr_reg_list) { 1892 1893 tmp[0] = '\0'; 1894 isid_buf[0] = '\0'; 1895 tpg = pr_reg->pr_reg_nacl->se_tpg; 1896 /* 1897 * Write out any ISID value to APTPL metadata that was included 1898 * in the original registration. 1899 */ 1900 if (pr_reg->isid_present_at_reg) 1901 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1902 pr_reg->pr_reg_isid); 1903 /* 1904 * Include special metadata if the pr_reg matches the 1905 * reservation holder. 1906 */ 1907 if (dev->dev_pr_res_holder == pr_reg) { 1908 snprintf(tmp, 512, "PR_REG_START: %d" 1909 "\ninitiator_fabric=%s\n" 1910 "initiator_node=%s\n%s" 1911 "sa_res_key=%llu\n" 1912 "res_holder=1\nres_type=%02x\n" 1913 "res_scope=%02x\nres_all_tg_pt=%d\n" 1914 "mapped_lun=%llu\n", reg_count, 1915 tpg->se_tpg_tfo->fabric_name, 1916 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1917 pr_reg->pr_res_key, pr_reg->pr_res_type, 1918 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1919 pr_reg->pr_res_mapped_lun); 1920 } else { 1921 snprintf(tmp, 512, "PR_REG_START: %d\n" 1922 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1923 "sa_res_key=%llu\nres_holder=0\n" 1924 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1925 reg_count, tpg->se_tpg_tfo->fabric_name, 1926 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1927 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1928 pr_reg->pr_res_mapped_lun); 1929 } 1930 1931 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1932 pr_err("Unable to update renaming APTPL metadata," 1933 " reallocating larger buffer\n"); 1934 ret = -EMSGSIZE; 1935 goto out; 1936 } 1937 len += sprintf(buf+len, "%s", tmp); 1938 1939 /* 1940 * Include information about the associated SCSI target port. 1941 */ 1942 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1943 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1944 " %d\n", tpg->se_tpg_tfo->fabric_name, 1945 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1946 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1947 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1948 reg_count); 1949 1950 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1951 pr_err("Unable to update renaming APTPL metadata," 1952 " reallocating larger buffer\n"); 1953 ret = -EMSGSIZE; 1954 goto out; 1955 } 1956 len += sprintf(buf+len, "%s", tmp); 1957 reg_count++; 1958 } 1959 1960 if (!reg_count) 1961 len += sprintf(buf+len, "No Registrations or Reservations"); 1962 1963 out: 1964 spin_unlock(&dev->t10_pr.registration_lock); 1965 spin_unlock(&dev->dev_reservation_lock); 1966 1967 return ret; 1968 } 1969 1970 static int __core_scsi3_write_aptpl_to_file( 1971 struct se_device *dev, 1972 unsigned char *buf) 1973 { 1974 struct t10_wwn *wwn = &dev->t10_wwn; 1975 struct file *file; 1976 int flags = O_RDWR | O_CREAT | O_TRUNC; 1977 char *path; 1978 u32 pr_aptpl_buf_len; 1979 int ret; 1980 loff_t pos = 0; 1981 1982 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1983 &wwn->unit_serial[0]); 1984 if (!path) 1985 return -ENOMEM; 1986 1987 file = filp_open(path, flags, 0600); 1988 if (IS_ERR(file)) { 1989 pr_err("filp_open(%s) for APTPL metadata" 1990 " failed\n", path); 1991 kfree(path); 1992 return PTR_ERR(file); 1993 } 1994 1995 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1996 1997 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1998 1999 if (ret < 0) 2000 pr_debug("Error writing APTPL metadata file: %s\n", path); 2001 fput(file); 2002 kfree(path); 2003 2004 return (ret < 0) ? -EIO : 0; 2005 } 2006 2007 /* 2008 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2009 * write out the updated metadata to struct file for this SCSI device. 2010 */ 2011 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2012 { 2013 unsigned char *buf; 2014 int rc, len = PR_APTPL_BUF_LEN; 2015 2016 if (!aptpl) { 2017 char *null_buf = "No Registrations or Reservations\n"; 2018 2019 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2020 dev->t10_pr.pr_aptpl_active = 0; 2021 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2022 2023 if (rc) 2024 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2025 2026 return 0; 2027 } 2028 retry: 2029 buf = vzalloc(len); 2030 if (!buf) 2031 return TCM_OUT_OF_RESOURCES; 2032 2033 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2034 if (rc < 0) { 2035 vfree(buf); 2036 len *= 2; 2037 goto retry; 2038 } 2039 2040 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2041 if (rc != 0) { 2042 pr_err("SPC-3 PR: Could not update APTPL\n"); 2043 vfree(buf); 2044 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2045 } 2046 dev->t10_pr.pr_aptpl_active = 1; 2047 vfree(buf); 2048 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2049 return 0; 2050 } 2051 2052 static sense_reason_t 2053 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2054 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2055 { 2056 struct se_session *se_sess = cmd->se_sess; 2057 struct se_device *dev = cmd->se_dev; 2058 struct se_lun *se_lun = cmd->se_lun; 2059 struct se_portal_group *se_tpg; 2060 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2061 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2062 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2063 sense_reason_t ret = TCM_NO_SENSE; 2064 int pr_holder = 0, type; 2065 2066 if (!se_sess || !se_lun) { 2067 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2068 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2069 } 2070 se_tpg = se_sess->se_tpg; 2071 2072 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2073 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2074 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2075 PR_REG_ISID_LEN); 2076 isid_ptr = &isid_buf[0]; 2077 } 2078 /* 2079 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2080 */ 2081 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2082 if (!pr_reg) { 2083 if (res_key) { 2084 pr_warn("SPC-3 PR: Reservation Key non-zero" 2085 " for SA REGISTER, returning CONFLICT\n"); 2086 return TCM_RESERVATION_CONFLICT; 2087 } 2088 /* 2089 * Do nothing but return GOOD status. 2090 */ 2091 if (!sa_res_key) 2092 return 0; 2093 2094 if (!spec_i_pt) { 2095 /* 2096 * Perform the Service Action REGISTER on the Initiator 2097 * Port Endpoint that the PRO was received from on the 2098 * Logical Unit of the SCSI device server. 2099 */ 2100 if (core_scsi3_alloc_registration(cmd->se_dev, 2101 se_sess->se_node_acl, cmd->se_lun, 2102 NULL, cmd->orig_fe_lun, isid_ptr, 2103 sa_res_key, all_tg_pt, aptpl, 2104 register_type, 0)) { 2105 pr_err("Unable to allocate" 2106 " struct t10_pr_registration\n"); 2107 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2108 } 2109 } else { 2110 /* 2111 * Register both the Initiator port that received 2112 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2113 * TransportID from Parameter list and loop through 2114 * fabric dependent parameter list while calling 2115 * logic from of core_scsi3_alloc_registration() for 2116 * each TransportID provided SCSI Initiator Port/Device 2117 */ 2118 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2119 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2120 if (ret != 0) 2121 return ret; 2122 } 2123 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2124 } 2125 2126 /* ok, existing registration */ 2127 2128 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2129 pr_err("SPC-3 PR REGISTER: Received" 2130 " res_key: 0x%016Lx does not match" 2131 " existing SA REGISTER res_key:" 2132 " 0x%016Lx\n", res_key, 2133 pr_reg->pr_res_key); 2134 ret = TCM_RESERVATION_CONFLICT; 2135 goto out; 2136 } 2137 2138 if (spec_i_pt) { 2139 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2140 " set on a registered nexus\n"); 2141 ret = TCM_INVALID_PARAMETER_LIST; 2142 goto out; 2143 } 2144 2145 /* 2146 * An existing ALL_TG_PT=1 registration being released 2147 * must also set ALL_TG_PT=1 in the incoming PROUT. 2148 */ 2149 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2150 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2151 " registration exists, but ALL_TG_PT=1 bit not" 2152 " present in received PROUT\n"); 2153 ret = TCM_INVALID_CDB_FIELD; 2154 goto out; 2155 } 2156 2157 /* 2158 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2159 */ 2160 if (sa_res_key) { 2161 /* 2162 * Increment PRgeneration counter for struct se_device" 2163 * upon a successful REGISTER, see spc4r17 section 6.3.2 2164 * READ_KEYS service action. 2165 */ 2166 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2167 pr_reg->pr_res_key = sa_res_key; 2168 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2169 " Key for %s to: 0x%016Lx PRgeneration:" 2170 " 0x%08x\n", cmd->se_tfo->fabric_name, 2171 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2172 pr_reg->pr_reg_nacl->initiatorname, 2173 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2174 2175 } else { 2176 /* 2177 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2178 */ 2179 type = pr_reg->pr_res_type; 2180 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2181 pr_reg); 2182 if (pr_holder < 0) { 2183 ret = TCM_RESERVATION_CONFLICT; 2184 goto out; 2185 } 2186 2187 spin_lock(&pr_tmpl->registration_lock); 2188 /* 2189 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2190 * and matching pr_res_key. 2191 */ 2192 if (pr_reg->pr_reg_all_tg_pt) { 2193 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2194 &pr_tmpl->registration_list, 2195 pr_reg_list) { 2196 2197 if (!pr_reg_p->pr_reg_all_tg_pt) 2198 continue; 2199 if (pr_reg_p->pr_res_key != res_key) 2200 continue; 2201 if (pr_reg == pr_reg_p) 2202 continue; 2203 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2204 pr_reg_p->pr_reg_nacl->initiatorname)) 2205 continue; 2206 2207 __core_scsi3_free_registration(dev, 2208 pr_reg_p, NULL, 0); 2209 } 2210 } 2211 2212 /* 2213 * Release the calling I_T Nexus registration now.. 2214 */ 2215 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2216 pr_reg = NULL; 2217 2218 /* 2219 * From spc4r17, section 5.7.11.3 Unregistering 2220 * 2221 * If the persistent reservation is a registrants only 2222 * type, the device server shall establish a unit 2223 * attention condition for the initiator port associated 2224 * with every registered I_T nexus except for the I_T 2225 * nexus on which the PERSISTENT RESERVE OUT command was 2226 * received, with the additional sense code set to 2227 * RESERVATIONS RELEASED. 2228 */ 2229 if (pr_holder && 2230 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2231 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2232 list_for_each_entry(pr_reg_p, 2233 &pr_tmpl->registration_list, 2234 pr_reg_list) { 2235 2236 target_ua_allocate_lun( 2237 pr_reg_p->pr_reg_nacl, 2238 pr_reg_p->pr_res_mapped_lun, 2239 0x2A, 2240 ASCQ_2AH_RESERVATIONS_RELEASED); 2241 } 2242 } 2243 2244 spin_unlock(&pr_tmpl->registration_lock); 2245 } 2246 2247 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2248 2249 out: 2250 if (pr_reg) 2251 core_scsi3_put_pr_reg(pr_reg); 2252 return ret; 2253 } 2254 2255 unsigned char *core_scsi3_pr_dump_type(int type) 2256 { 2257 switch (type) { 2258 case PR_TYPE_WRITE_EXCLUSIVE: 2259 return "Write Exclusive Access"; 2260 case PR_TYPE_EXCLUSIVE_ACCESS: 2261 return "Exclusive Access"; 2262 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2263 return "Write Exclusive Access, Registrants Only"; 2264 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2265 return "Exclusive Access, Registrants Only"; 2266 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2267 return "Write Exclusive Access, All Registrants"; 2268 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2269 return "Exclusive Access, All Registrants"; 2270 default: 2271 break; 2272 } 2273 2274 return "Unknown SPC-3 PR Type"; 2275 } 2276 2277 static sense_reason_t 2278 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2279 { 2280 struct se_device *dev = cmd->se_dev; 2281 struct se_session *se_sess = cmd->se_sess; 2282 struct se_lun *se_lun = cmd->se_lun; 2283 struct t10_pr_registration *pr_reg, *pr_res_holder; 2284 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2285 char i_buf[PR_REG_ISID_ID_LEN]; 2286 sense_reason_t ret; 2287 2288 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2289 2290 if (!se_sess || !se_lun) { 2291 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2293 } 2294 /* 2295 * Locate the existing *pr_reg via struct se_node_acl pointers 2296 */ 2297 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2298 se_sess); 2299 if (!pr_reg) { 2300 pr_err("SPC-3 PR: Unable to locate" 2301 " PR_REGISTERED *pr_reg for RESERVE\n"); 2302 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2303 } 2304 /* 2305 * From spc4r17 Section 5.7.9: Reserving: 2306 * 2307 * An application client creates a persistent reservation by issuing 2308 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2309 * a registered I_T nexus with the following parameters: 2310 * a) RESERVATION KEY set to the value of the reservation key that is 2311 * registered with the logical unit for the I_T nexus; and 2312 */ 2313 if (res_key != pr_reg->pr_res_key) { 2314 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2315 " does not match existing SA REGISTER res_key:" 2316 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2317 ret = TCM_RESERVATION_CONFLICT; 2318 goto out_put_pr_reg; 2319 } 2320 /* 2321 * From spc4r17 Section 5.7.9: Reserving: 2322 * 2323 * From above: 2324 * b) TYPE field and SCOPE field set to the persistent reservation 2325 * being created. 2326 * 2327 * Only one persistent reservation is allowed at a time per logical unit 2328 * and that persistent reservation has a scope of LU_SCOPE. 2329 */ 2330 if (scope != PR_SCOPE_LU_SCOPE) { 2331 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2332 ret = TCM_INVALID_PARAMETER_LIST; 2333 goto out_put_pr_reg; 2334 } 2335 /* 2336 * See if we have an existing PR reservation holder pointer at 2337 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2338 * *pr_res_holder. 2339 */ 2340 spin_lock(&dev->dev_reservation_lock); 2341 pr_res_holder = dev->dev_pr_res_holder; 2342 if (pr_res_holder) { 2343 /* 2344 * From spc4r17 Section 5.7.9: Reserving: 2345 * 2346 * If the device server receives a PERSISTENT RESERVE OUT 2347 * command from an I_T nexus other than a persistent reservation 2348 * holder (see 5.7.10) that attempts to create a persistent 2349 * reservation when a persistent reservation already exists for 2350 * the logical unit, then the command shall be completed with 2351 * RESERVATION CONFLICT status. 2352 */ 2353 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2354 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2355 pr_err("SPC-3 PR: Attempted RESERVE from" 2356 " [%s]: %s while reservation already held by" 2357 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2358 cmd->se_tfo->fabric_name, 2359 se_sess->se_node_acl->initiatorname, 2360 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2361 pr_res_holder->pr_reg_nacl->initiatorname); 2362 2363 spin_unlock(&dev->dev_reservation_lock); 2364 ret = TCM_RESERVATION_CONFLICT; 2365 goto out_put_pr_reg; 2366 } 2367 /* 2368 * From spc4r17 Section 5.7.9: Reserving: 2369 * 2370 * If a persistent reservation holder attempts to modify the 2371 * type or scope of an existing persistent reservation, the 2372 * command shall be completed with RESERVATION CONFLICT status. 2373 */ 2374 if ((pr_res_holder->pr_res_type != type) || 2375 (pr_res_holder->pr_res_scope != scope)) { 2376 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2377 pr_err("SPC-3 PR: Attempted RESERVE from" 2378 " [%s]: %s trying to change TYPE and/or SCOPE," 2379 " while reservation already held by [%s]: %s," 2380 " returning RESERVATION_CONFLICT\n", 2381 cmd->se_tfo->fabric_name, 2382 se_sess->se_node_acl->initiatorname, 2383 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2384 pr_res_holder->pr_reg_nacl->initiatorname); 2385 2386 spin_unlock(&dev->dev_reservation_lock); 2387 ret = TCM_RESERVATION_CONFLICT; 2388 goto out_put_pr_reg; 2389 } 2390 /* 2391 * From spc4r17 Section 5.7.9: Reserving: 2392 * 2393 * If the device server receives a PERSISTENT RESERVE OUT 2394 * command with RESERVE service action where the TYPE field and 2395 * the SCOPE field contain the same values as the existing type 2396 * and scope from a persistent reservation holder, it shall not 2397 * make any change to the existing persistent reservation and 2398 * shall completethe command with GOOD status. 2399 */ 2400 spin_unlock(&dev->dev_reservation_lock); 2401 ret = 0; 2402 goto out_put_pr_reg; 2403 } 2404 /* 2405 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2406 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2407 */ 2408 pr_reg->pr_res_scope = scope; 2409 pr_reg->pr_res_type = type; 2410 pr_reg->pr_res_holder = 1; 2411 dev->dev_pr_res_holder = pr_reg; 2412 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2413 2414 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2415 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2416 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), 2417 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2418 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2419 cmd->se_tfo->fabric_name, 2420 se_sess->se_node_acl->initiatorname, 2421 i_buf); 2422 spin_unlock(&dev->dev_reservation_lock); 2423 2424 if (pr_tmpl->pr_aptpl_active) 2425 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2426 2427 ret = 0; 2428 out_put_pr_reg: 2429 core_scsi3_put_pr_reg(pr_reg); 2430 return ret; 2431 } 2432 2433 static sense_reason_t 2434 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2435 u64 res_key) 2436 { 2437 switch (type) { 2438 case PR_TYPE_WRITE_EXCLUSIVE: 2439 case PR_TYPE_EXCLUSIVE_ACCESS: 2440 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2441 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2442 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2443 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2444 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2445 default: 2446 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2447 " 0x%02x\n", type); 2448 return TCM_INVALID_CDB_FIELD; 2449 } 2450 } 2451 2452 static void __core_scsi3_complete_pro_release( 2453 struct se_device *dev, 2454 struct se_node_acl *se_nacl, 2455 struct t10_pr_registration *pr_reg, 2456 int explicit, 2457 int unreg) 2458 { 2459 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2460 char i_buf[PR_REG_ISID_ID_LEN]; 2461 int pr_res_type = 0, pr_res_scope = 0; 2462 2463 lockdep_assert_held(&dev->dev_reservation_lock); 2464 2465 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2466 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2467 /* 2468 * Go ahead and release the current PR reservation holder. 2469 * If an All Registrants reservation is currently active and 2470 * a unregister operation is requested, replace the current 2471 * dev_pr_res_holder with another active registration. 2472 */ 2473 if (dev->dev_pr_res_holder) { 2474 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2475 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2476 dev->dev_pr_res_holder->pr_res_type = 0; 2477 dev->dev_pr_res_holder->pr_res_scope = 0; 2478 dev->dev_pr_res_holder->pr_res_holder = 0; 2479 dev->dev_pr_res_holder = NULL; 2480 } 2481 if (!unreg) 2482 goto out; 2483 2484 spin_lock(&dev->t10_pr.registration_lock); 2485 list_del_init(&pr_reg->pr_reg_list); 2486 /* 2487 * If the I_T nexus is a reservation holder, the persistent reservation 2488 * is of an all registrants type, and the I_T nexus is the last remaining 2489 * registered I_T nexus, then the device server shall also release the 2490 * persistent reservation. 2491 */ 2492 if (!list_empty(&dev->t10_pr.registration_list) && 2493 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2494 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2495 dev->dev_pr_res_holder = 2496 list_entry(dev->t10_pr.registration_list.next, 2497 struct t10_pr_registration, pr_reg_list); 2498 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2499 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2500 dev->dev_pr_res_holder->pr_res_holder = 1; 2501 } 2502 spin_unlock(&dev->t10_pr.registration_lock); 2503 out: 2504 if (!dev->dev_pr_res_holder) { 2505 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2506 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2507 tfo->fabric_name, (explicit) ? "explicit" : 2508 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2509 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2510 } 2511 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2512 tfo->fabric_name, se_nacl->initiatorname, 2513 i_buf); 2514 /* 2515 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2516 */ 2517 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2518 } 2519 2520 static sense_reason_t 2521 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2522 u64 res_key) 2523 { 2524 struct se_device *dev = cmd->se_dev; 2525 struct se_session *se_sess = cmd->se_sess; 2526 struct se_lun *se_lun = cmd->se_lun; 2527 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2528 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2529 sense_reason_t ret = 0; 2530 2531 if (!se_sess || !se_lun) { 2532 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2533 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2534 } 2535 /* 2536 * Locate the existing *pr_reg via struct se_node_acl pointers 2537 */ 2538 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2539 if (!pr_reg) { 2540 pr_err("SPC-3 PR: Unable to locate" 2541 " PR_REGISTERED *pr_reg for RELEASE\n"); 2542 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2543 } 2544 /* 2545 * From spc4r17 Section 5.7.11.2 Releasing: 2546 * 2547 * If there is no persistent reservation or in response to a persistent 2548 * reservation release request from a registered I_T nexus that is not a 2549 * persistent reservation holder (see 5.7.10), the device server shall 2550 * do the following: 2551 * 2552 * a) Not release the persistent reservation, if any; 2553 * b) Not remove any registrations; and 2554 * c) Complete the command with GOOD status. 2555 */ 2556 spin_lock(&dev->dev_reservation_lock); 2557 pr_res_holder = dev->dev_pr_res_holder; 2558 if (!pr_res_holder) { 2559 /* 2560 * No persistent reservation, return GOOD status. 2561 */ 2562 spin_unlock(&dev->dev_reservation_lock); 2563 goto out_put_pr_reg; 2564 } 2565 2566 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2567 /* 2568 * Release request from a registered I_T nexus that is not a 2569 * persistent reservation holder. return GOOD status. 2570 */ 2571 spin_unlock(&dev->dev_reservation_lock); 2572 goto out_put_pr_reg; 2573 } 2574 2575 /* 2576 * From spc4r17 Section 5.7.11.2 Releasing: 2577 * 2578 * Only the persistent reservation holder (see 5.7.10) is allowed to 2579 * release a persistent reservation. 2580 * 2581 * An application client releases the persistent reservation by issuing 2582 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2583 * an I_T nexus that is a persistent reservation holder with the 2584 * following parameters: 2585 * 2586 * a) RESERVATION KEY field set to the value of the reservation key 2587 * that is registered with the logical unit for the I_T nexus; 2588 */ 2589 if (res_key != pr_reg->pr_res_key) { 2590 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2591 " does not match existing SA REGISTER res_key:" 2592 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2593 spin_unlock(&dev->dev_reservation_lock); 2594 ret = TCM_RESERVATION_CONFLICT; 2595 goto out_put_pr_reg; 2596 } 2597 /* 2598 * From spc4r17 Section 5.7.11.2 Releasing and above: 2599 * 2600 * b) TYPE field and SCOPE field set to match the persistent 2601 * reservation being released. 2602 */ 2603 if ((pr_res_holder->pr_res_type != type) || 2604 (pr_res_holder->pr_res_scope != scope)) { 2605 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2606 pr_err("SPC-3 PR RELEASE: Attempted to release" 2607 " reservation from [%s]: %s with different TYPE " 2608 "and/or SCOPE while reservation already held by" 2609 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2610 cmd->se_tfo->fabric_name, 2611 se_sess->se_node_acl->initiatorname, 2612 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2613 pr_res_holder->pr_reg_nacl->initiatorname); 2614 2615 spin_unlock(&dev->dev_reservation_lock); 2616 ret = TCM_RESERVATION_CONFLICT; 2617 goto out_put_pr_reg; 2618 } 2619 /* 2620 * In response to a persistent reservation release request from the 2621 * persistent reservation holder the device server shall perform a 2622 * release by doing the following as an uninterrupted series of actions: 2623 * a) Release the persistent reservation; 2624 * b) Not remove any registration(s); 2625 * c) If the released persistent reservation is a registrants only type 2626 * or all registrants type persistent reservation, 2627 * the device server shall establish a unit attention condition for 2628 * the initiator port associated with every regis- 2629 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2630 * RESERVE OUT command with RELEASE service action was received, 2631 * with the additional sense code set to RESERVATIONS RELEASED; and 2632 * d) If the persistent reservation is of any other type, the device 2633 * server shall not establish a unit attention condition. 2634 */ 2635 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2636 pr_reg, 1, 0); 2637 2638 spin_unlock(&dev->dev_reservation_lock); 2639 2640 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2641 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2642 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2643 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2644 /* 2645 * If no UNIT ATTENTION conditions will be established for 2646 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2647 * go ahead and check for APTPL=1 update+write below 2648 */ 2649 goto write_aptpl; 2650 } 2651 2652 spin_lock(&pr_tmpl->registration_lock); 2653 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2654 pr_reg_list) { 2655 /* 2656 * Do not establish a UNIT ATTENTION condition 2657 * for the calling I_T Nexus 2658 */ 2659 if (pr_reg_p == pr_reg) 2660 continue; 2661 2662 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2663 pr_reg_p->pr_res_mapped_lun, 2664 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2665 } 2666 spin_unlock(&pr_tmpl->registration_lock); 2667 2668 write_aptpl: 2669 if (pr_tmpl->pr_aptpl_active) 2670 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2671 2672 out_put_pr_reg: 2673 core_scsi3_put_pr_reg(pr_reg); 2674 return ret; 2675 } 2676 2677 static sense_reason_t 2678 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2679 { 2680 struct se_device *dev = cmd->se_dev; 2681 struct se_node_acl *pr_reg_nacl; 2682 struct se_session *se_sess = cmd->se_sess; 2683 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2684 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2685 u64 pr_res_mapped_lun = 0; 2686 int calling_it_nexus = 0; 2687 /* 2688 * Locate the existing *pr_reg via struct se_node_acl pointers 2689 */ 2690 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2691 se_sess->se_node_acl, se_sess); 2692 if (!pr_reg_n) { 2693 pr_err("SPC-3 PR: Unable to locate" 2694 " PR_REGISTERED *pr_reg for CLEAR\n"); 2695 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2696 } 2697 /* 2698 * From spc4r17 section 5.7.11.6, Clearing: 2699 * 2700 * Any application client may release the persistent reservation and 2701 * remove all registrations from a device server by issuing a 2702 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2703 * registered I_T nexus with the following parameter: 2704 * 2705 * a) RESERVATION KEY field set to the value of the reservation key 2706 * that is registered with the logical unit for the I_T nexus. 2707 */ 2708 if (res_key != pr_reg_n->pr_res_key) { 2709 pr_err("SPC-3 PR REGISTER: Received" 2710 " res_key: 0x%016Lx does not match" 2711 " existing SA REGISTER res_key:" 2712 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2713 core_scsi3_put_pr_reg(pr_reg_n); 2714 return TCM_RESERVATION_CONFLICT; 2715 } 2716 /* 2717 * a) Release the persistent reservation, if any; 2718 */ 2719 spin_lock(&dev->dev_reservation_lock); 2720 pr_res_holder = dev->dev_pr_res_holder; 2721 if (pr_res_holder) { 2722 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2723 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2724 pr_res_holder, 0, 0); 2725 } 2726 spin_unlock(&dev->dev_reservation_lock); 2727 /* 2728 * b) Remove all registration(s) (see spc4r17 5.7.7); 2729 */ 2730 spin_lock(&pr_tmpl->registration_lock); 2731 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2732 &pr_tmpl->registration_list, pr_reg_list) { 2733 2734 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2735 pr_reg_nacl = pr_reg->pr_reg_nacl; 2736 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2737 __core_scsi3_free_registration(dev, pr_reg, NULL, 2738 calling_it_nexus); 2739 /* 2740 * e) Establish a unit attention condition for the initiator 2741 * port associated with every registered I_T nexus other 2742 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2743 * command with CLEAR service action was received, with the 2744 * additional sense code set to RESERVATIONS PREEMPTED. 2745 */ 2746 if (!calling_it_nexus) 2747 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2748 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2749 } 2750 spin_unlock(&pr_tmpl->registration_lock); 2751 2752 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2753 cmd->se_tfo->fabric_name); 2754 2755 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2756 2757 core_scsi3_pr_generation(dev); 2758 return 0; 2759 } 2760 2761 static void __core_scsi3_complete_pro_preempt( 2762 struct se_device *dev, 2763 struct t10_pr_registration *pr_reg, 2764 struct list_head *preempt_and_abort_list, 2765 int type, 2766 int scope, 2767 enum preempt_type preempt_type) 2768 { 2769 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2770 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2771 char i_buf[PR_REG_ISID_ID_LEN]; 2772 2773 lockdep_assert_held(&dev->dev_reservation_lock); 2774 2775 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2776 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2777 /* 2778 * Do an implicit RELEASE of the existing reservation. 2779 */ 2780 if (dev->dev_pr_res_holder) 2781 __core_scsi3_complete_pro_release(dev, nacl, 2782 dev->dev_pr_res_holder, 0, 0); 2783 2784 dev->dev_pr_res_holder = pr_reg; 2785 pr_reg->pr_res_holder = 1; 2786 pr_reg->pr_res_type = type; 2787 pr_reg->pr_res_scope = scope; 2788 2789 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2790 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2791 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2792 core_scsi3_pr_dump_type(type), 2793 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2794 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2795 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2796 nacl->initiatorname, i_buf); 2797 /* 2798 * For PREEMPT_AND_ABORT, add the preempting reservation's 2799 * struct t10_pr_registration to the list that will be compared 2800 * against received CDBs.. 2801 */ 2802 if (preempt_and_abort_list) 2803 list_add_tail(&pr_reg->pr_reg_abort_list, 2804 preempt_and_abort_list); 2805 } 2806 2807 static void core_scsi3_release_preempt_and_abort( 2808 struct list_head *preempt_and_abort_list, 2809 struct t10_pr_registration *pr_reg_holder) 2810 { 2811 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2812 2813 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2814 pr_reg_abort_list) { 2815 2816 list_del(&pr_reg->pr_reg_abort_list); 2817 if (pr_reg_holder == pr_reg) 2818 continue; 2819 if (pr_reg->pr_res_holder) { 2820 pr_warn("pr_reg->pr_res_holder still set\n"); 2821 continue; 2822 } 2823 2824 pr_reg->pr_reg_deve = NULL; 2825 pr_reg->pr_reg_nacl = NULL; 2826 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2827 } 2828 } 2829 2830 static sense_reason_t 2831 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2832 u64 sa_res_key, enum preempt_type preempt_type) 2833 { 2834 struct se_device *dev = cmd->se_dev; 2835 struct se_node_acl *pr_reg_nacl; 2836 struct se_session *se_sess = cmd->se_sess; 2837 LIST_HEAD(preempt_and_abort_list); 2838 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2839 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2840 u64 pr_res_mapped_lun = 0; 2841 int all_reg = 0, calling_it_nexus = 0; 2842 bool sa_res_key_unmatched = sa_res_key != 0; 2843 int prh_type = 0, prh_scope = 0; 2844 2845 if (!se_sess) 2846 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2847 2848 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2849 se_sess); 2850 if (!pr_reg_n) { 2851 pr_err("SPC-3 PR: Unable to locate" 2852 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2853 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2854 return TCM_RESERVATION_CONFLICT; 2855 } 2856 if (pr_reg_n->pr_res_key != res_key) { 2857 core_scsi3_put_pr_reg(pr_reg_n); 2858 return TCM_RESERVATION_CONFLICT; 2859 } 2860 if (scope != PR_SCOPE_LU_SCOPE) { 2861 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2862 core_scsi3_put_pr_reg(pr_reg_n); 2863 return TCM_INVALID_PARAMETER_LIST; 2864 } 2865 2866 spin_lock(&dev->dev_reservation_lock); 2867 pr_res_holder = dev->dev_pr_res_holder; 2868 if (pr_res_holder && 2869 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2870 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2871 all_reg = 1; 2872 2873 if (!all_reg && !sa_res_key) { 2874 spin_unlock(&dev->dev_reservation_lock); 2875 core_scsi3_put_pr_reg(pr_reg_n); 2876 return TCM_INVALID_PARAMETER_LIST; 2877 } 2878 /* 2879 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2880 * 2881 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2882 * persistent reservation holder or there is no persistent reservation 2883 * holder (i.e., there is no persistent reservation), then the device 2884 * server shall perform a preempt by doing the following in an 2885 * uninterrupted series of actions. (See below..) 2886 */ 2887 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2888 /* 2889 * No existing or SA Reservation Key matching reservations.. 2890 * 2891 * PROUT SA PREEMPT with All Registrant type reservations are 2892 * allowed to be processed without a matching SA Reservation Key 2893 */ 2894 spin_lock(&pr_tmpl->registration_lock); 2895 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2896 &pr_tmpl->registration_list, pr_reg_list) { 2897 /* 2898 * Removing of registrations in non all registrants 2899 * type reservations without a matching SA reservation 2900 * key. 2901 * 2902 * a) Remove the registrations for all I_T nexuses 2903 * specified by the SERVICE ACTION RESERVATION KEY 2904 * field; 2905 * b) Ignore the contents of the SCOPE and TYPE fields; 2906 * c) Process tasks as defined in 5.7.1; and 2907 * d) Establish a unit attention condition for the 2908 * initiator port associated with every I_T nexus 2909 * that lost its registration other than the I_T 2910 * nexus on which the PERSISTENT RESERVE OUT command 2911 * was received, with the additional sense code set 2912 * to REGISTRATIONS PREEMPTED. 2913 */ 2914 if (!all_reg) { 2915 if (pr_reg->pr_res_key != sa_res_key) 2916 continue; 2917 sa_res_key_unmatched = false; 2918 2919 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2920 pr_reg_nacl = pr_reg->pr_reg_nacl; 2921 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2922 __core_scsi3_free_registration(dev, pr_reg, 2923 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2924 NULL, calling_it_nexus); 2925 } else { 2926 /* 2927 * Case for any existing all registrants type 2928 * reservation, follow logic in spc4r17 section 2929 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2930 * 2931 * For a ZERO SA Reservation key, release 2932 * all other registrations and do an implicit 2933 * release of active persistent reservation. 2934 * 2935 * For a non-ZERO SA Reservation key, only 2936 * release the matching reservation key from 2937 * registrations. 2938 */ 2939 if ((sa_res_key) && 2940 (pr_reg->pr_res_key != sa_res_key)) 2941 continue; 2942 sa_res_key_unmatched = false; 2943 2944 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2945 if (calling_it_nexus) 2946 continue; 2947 2948 pr_reg_nacl = pr_reg->pr_reg_nacl; 2949 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2950 __core_scsi3_free_registration(dev, pr_reg, 2951 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2952 NULL, 0); 2953 } 2954 if (!calling_it_nexus) 2955 target_ua_allocate_lun(pr_reg_nacl, 2956 pr_res_mapped_lun, 0x2A, 2957 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2958 } 2959 spin_unlock(&pr_tmpl->registration_lock); 2960 /* 2961 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2962 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2963 * RESERVATION KEY field to a value that does not match any 2964 * registered reservation key, then the device server shall 2965 * complete the command with RESERVATION CONFLICT status. 2966 */ 2967 if (sa_res_key_unmatched) { 2968 spin_unlock(&dev->dev_reservation_lock); 2969 core_scsi3_put_pr_reg(pr_reg_n); 2970 return TCM_RESERVATION_CONFLICT; 2971 } 2972 /* 2973 * For an existing all registrants type reservation 2974 * with a zero SA rservation key, preempt the existing 2975 * reservation with the new PR type and scope. 2976 */ 2977 if (pr_res_holder && all_reg && !(sa_res_key)) { 2978 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2979 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2980 type, scope, preempt_type); 2981 2982 if (preempt_type == PREEMPT_AND_ABORT) 2983 core_scsi3_release_preempt_and_abort( 2984 &preempt_and_abort_list, pr_reg_n); 2985 } 2986 spin_unlock(&dev->dev_reservation_lock); 2987 2988 if (pr_tmpl->pr_aptpl_active) 2989 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2990 2991 core_scsi3_put_pr_reg(pr_reg_n); 2992 core_scsi3_pr_generation(cmd->se_dev); 2993 return 0; 2994 } 2995 /* 2996 * The PREEMPTing SA reservation key matches that of the 2997 * existing persistent reservation, first, we check if 2998 * we are preempting our own reservation. 2999 * From spc4r17, section 5.7.11.4.3 Preempting 3000 * persistent reservations and registration handling 3001 * 3002 * If an all registrants persistent reservation is not 3003 * present, it is not an error for the persistent 3004 * reservation holder to preempt itself (i.e., a 3005 * PERSISTENT RESERVE OUT with a PREEMPT service action 3006 * or a PREEMPT AND ABORT service action with the 3007 * SERVICE ACTION RESERVATION KEY value equal to the 3008 * persistent reservation holder's reservation key that 3009 * is received from the persistent reservation holder). 3010 * In that case, the device server shall establish the 3011 * new persistent reservation and maintain the 3012 * registration. 3013 */ 3014 prh_type = pr_res_holder->pr_res_type; 3015 prh_scope = pr_res_holder->pr_res_scope; 3016 /* 3017 * If the SERVICE ACTION RESERVATION KEY field identifies a 3018 * persistent reservation holder (see 5.7.10), the device 3019 * server shall perform a preempt by doing the following as 3020 * an uninterrupted series of actions: 3021 * 3022 * a) Release the persistent reservation for the holder 3023 * identified by the SERVICE ACTION RESERVATION KEY field; 3024 */ 3025 if (pr_reg_n != pr_res_holder) 3026 __core_scsi3_complete_pro_release(dev, 3027 pr_res_holder->pr_reg_nacl, 3028 dev->dev_pr_res_holder, 0, 0); 3029 /* 3030 * b) Remove the registrations for all I_T nexuses identified 3031 * by the SERVICE ACTION RESERVATION KEY field, except the 3032 * I_T nexus that is being used for the PERSISTENT RESERVE 3033 * OUT command. If an all registrants persistent reservation 3034 * is present and the SERVICE ACTION RESERVATION KEY field 3035 * is set to zero, then all registrations shall be removed 3036 * except for that of the I_T nexus that is being used for 3037 * the PERSISTENT RESERVE OUT command; 3038 */ 3039 spin_lock(&pr_tmpl->registration_lock); 3040 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3041 &pr_tmpl->registration_list, pr_reg_list) { 3042 3043 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3044 if (calling_it_nexus) 3045 continue; 3046 3047 if (pr_reg->pr_res_key != sa_res_key) 3048 continue; 3049 3050 pr_reg_nacl = pr_reg->pr_reg_nacl; 3051 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3052 __core_scsi3_free_registration(dev, pr_reg, 3053 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3054 calling_it_nexus); 3055 /* 3056 * e) Establish a unit attention condition for the initiator 3057 * port associated with every I_T nexus that lost its 3058 * persistent reservation and/or registration, with the 3059 * additional sense code set to REGISTRATIONS PREEMPTED; 3060 */ 3061 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3062 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3063 } 3064 spin_unlock(&pr_tmpl->registration_lock); 3065 /* 3066 * c) Establish a persistent reservation for the preempting 3067 * I_T nexus using the contents of the SCOPE and TYPE fields; 3068 */ 3069 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3070 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3071 type, scope, preempt_type); 3072 /* 3073 * d) Process tasks as defined in 5.7.1; 3074 * e) See above.. 3075 * f) If the type or scope has changed, then for every I_T nexus 3076 * whose reservation key was not removed, except for the I_T 3077 * nexus on which the PERSISTENT RESERVE OUT command was 3078 * received, the device server shall establish a unit 3079 * attention condition for the initiator port associated with 3080 * that I_T nexus, with the additional sense code set to 3081 * RESERVATIONS RELEASED. If the type or scope have not 3082 * changed, then no unit attention condition(s) shall be 3083 * established for this reason. 3084 */ 3085 if ((prh_type != type) || (prh_scope != scope)) { 3086 spin_lock(&pr_tmpl->registration_lock); 3087 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3088 &pr_tmpl->registration_list, pr_reg_list) { 3089 3090 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3091 if (calling_it_nexus) 3092 continue; 3093 3094 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3095 pr_reg->pr_res_mapped_lun, 0x2A, 3096 ASCQ_2AH_RESERVATIONS_RELEASED); 3097 } 3098 spin_unlock(&pr_tmpl->registration_lock); 3099 } 3100 spin_unlock(&dev->dev_reservation_lock); 3101 /* 3102 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3103 * All received CDBs for the matching existing reservation and 3104 * registrations undergo ABORT_TASK logic. 3105 * 3106 * From there, core_scsi3_release_preempt_and_abort() will 3107 * release every registration in the list (which have already 3108 * been removed from the primary pr_reg list), except the 3109 * new persistent reservation holder, the calling Initiator Port. 3110 */ 3111 if (preempt_type == PREEMPT_AND_ABORT) { 3112 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3113 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3114 pr_reg_n); 3115 } 3116 3117 if (pr_tmpl->pr_aptpl_active) 3118 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3119 3120 core_scsi3_put_pr_reg(pr_reg_n); 3121 core_scsi3_pr_generation(cmd->se_dev); 3122 return 0; 3123 } 3124 3125 static sense_reason_t 3126 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3127 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3128 { 3129 switch (type) { 3130 case PR_TYPE_WRITE_EXCLUSIVE: 3131 case PR_TYPE_EXCLUSIVE_ACCESS: 3132 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3133 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3134 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3135 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3136 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3137 sa_res_key, preempt_type); 3138 default: 3139 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3140 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3141 return TCM_INVALID_CDB_FIELD; 3142 } 3143 } 3144 3145 3146 static sense_reason_t 3147 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3148 u64 sa_res_key, int aptpl, int unreg) 3149 { 3150 struct se_session *se_sess = cmd->se_sess; 3151 struct se_device *dev = cmd->se_dev; 3152 struct se_dev_entry *dest_se_deve = NULL; 3153 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3154 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3155 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3156 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3157 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3158 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3159 unsigned char *buf; 3160 const unsigned char *initiator_str; 3161 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3162 u32 tid_len, tmp_tid_len; 3163 int new_reg = 0, type, scope, matching_iname; 3164 sense_reason_t ret; 3165 unsigned short rtpi; 3166 unsigned char proto_ident; 3167 3168 if (!se_sess || !se_lun) { 3169 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3170 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3171 } 3172 3173 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3174 se_tpg = se_sess->se_tpg; 3175 tf_ops = se_tpg->se_tpg_tfo; 3176 /* 3177 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3178 * Register behaviors for a REGISTER AND MOVE service action 3179 * 3180 * Locate the existing *pr_reg via struct se_node_acl pointers 3181 */ 3182 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3183 se_sess); 3184 if (!pr_reg) { 3185 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3186 " *pr_reg for REGISTER_AND_MOVE\n"); 3187 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3188 } 3189 /* 3190 * The provided reservation key much match the existing reservation key 3191 * provided during this initiator's I_T nexus registration. 3192 */ 3193 if (res_key != pr_reg->pr_res_key) { 3194 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3195 " res_key: 0x%016Lx does not match existing SA REGISTER" 3196 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3197 ret = TCM_RESERVATION_CONFLICT; 3198 goto out_put_pr_reg; 3199 } 3200 /* 3201 * The service active reservation key needs to be non zero 3202 */ 3203 if (!sa_res_key) { 3204 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3205 " sa_res_key\n"); 3206 ret = TCM_INVALID_PARAMETER_LIST; 3207 goto out_put_pr_reg; 3208 } 3209 3210 /* 3211 * Determine the Relative Target Port Identifier where the reservation 3212 * will be moved to for the TransportID containing SCSI initiator WWN 3213 * information. 3214 */ 3215 buf = transport_kmap_data_sg(cmd); 3216 if (!buf) { 3217 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3218 goto out_put_pr_reg; 3219 } 3220 3221 rtpi = get_unaligned_be16(&buf[18]); 3222 tid_len = get_unaligned_be32(&buf[20]); 3223 transport_kunmap_data_sg(cmd); 3224 buf = NULL; 3225 3226 if ((tid_len + 24) != cmd->data_length) { 3227 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3228 " does not equal CDB data_length: %u\n", tid_len, 3229 cmd->data_length); 3230 ret = TCM_INVALID_PARAMETER_LIST; 3231 goto out_put_pr_reg; 3232 } 3233 3234 spin_lock(&dev->se_port_lock); 3235 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3236 if (tmp_lun->lun_rtpi != rtpi) 3237 continue; 3238 dest_se_tpg = tmp_lun->lun_tpg; 3239 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3240 if (!dest_tf_ops) 3241 continue; 3242 3243 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3244 spin_unlock(&dev->se_port_lock); 3245 3246 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3247 pr_err("core_scsi3_tpg_depend_item() failed" 3248 " for dest_se_tpg\n"); 3249 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3250 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3251 goto out_put_pr_reg; 3252 } 3253 3254 spin_lock(&dev->se_port_lock); 3255 break; 3256 } 3257 spin_unlock(&dev->se_port_lock); 3258 3259 if (!dest_se_tpg || !dest_tf_ops) { 3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3261 " fabric ops from Relative Target Port Identifier:" 3262 " %hu\n", rtpi); 3263 ret = TCM_INVALID_PARAMETER_LIST; 3264 goto out_put_pr_reg; 3265 } 3266 3267 buf = transport_kmap_data_sg(cmd); 3268 if (!buf) { 3269 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3270 goto out_put_pr_reg; 3271 } 3272 proto_ident = (buf[24] & 0x0f); 3273 3274 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3275 " 0x%02x\n", proto_ident); 3276 3277 if (proto_ident != dest_se_tpg->proto_id) { 3278 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3279 " proto_ident: 0x%02x does not match ident: 0x%02x" 3280 " from fabric: %s\n", proto_ident, 3281 dest_se_tpg->proto_id, 3282 dest_tf_ops->fabric_name); 3283 ret = TCM_INVALID_PARAMETER_LIST; 3284 goto out; 3285 } 3286 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3287 &buf[24], &tmp_tid_len, &iport_ptr); 3288 if (!initiator_str) { 3289 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3290 " initiator_str from Transport ID\n"); 3291 ret = TCM_INVALID_PARAMETER_LIST; 3292 goto out; 3293 } 3294 3295 transport_kunmap_data_sg(cmd); 3296 buf = NULL; 3297 3298 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3299 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? 3300 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3301 iport_ptr : ""); 3302 /* 3303 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3304 * action specifies a TransportID that is the same as the initiator port 3305 * of the I_T nexus for the command received, then the command shall 3306 * be terminated with CHECK CONDITION status, with the sense key set to 3307 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3308 * IN PARAMETER LIST. 3309 */ 3310 pr_reg_nacl = pr_reg->pr_reg_nacl; 3311 matching_iname = (!strcmp(initiator_str, 3312 pr_reg_nacl->initiatorname)) ? 1 : 0; 3313 if (!matching_iname) 3314 goto after_iport_check; 3315 3316 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3317 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3318 " matches: %s on received I_T Nexus\n", initiator_str, 3319 pr_reg_nacl->initiatorname); 3320 ret = TCM_INVALID_PARAMETER_LIST; 3321 goto out; 3322 } 3323 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3324 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3325 " matches: %s %s on received I_T Nexus\n", 3326 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3327 pr_reg->pr_reg_isid); 3328 ret = TCM_INVALID_PARAMETER_LIST; 3329 goto out; 3330 } 3331 after_iport_check: 3332 /* 3333 * Locate the destination struct se_node_acl from the received Transport ID 3334 */ 3335 mutex_lock(&dest_se_tpg->acl_node_mutex); 3336 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3337 initiator_str); 3338 if (dest_node_acl) 3339 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3340 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3341 3342 if (!dest_node_acl) { 3343 pr_err("Unable to locate %s dest_node_acl for" 3344 " TransportID%s\n", dest_tf_ops->fabric_name, 3345 initiator_str); 3346 ret = TCM_INVALID_PARAMETER_LIST; 3347 goto out; 3348 } 3349 3350 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3351 pr_err("core_scsi3_nodeacl_depend_item() for" 3352 " dest_node_acl\n"); 3353 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3354 dest_node_acl = NULL; 3355 ret = TCM_INVALID_PARAMETER_LIST; 3356 goto out; 3357 } 3358 3359 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3360 " %s from TransportID\n", dest_tf_ops->fabric_name, 3361 dest_node_acl->initiatorname); 3362 3363 /* 3364 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3365 * PORT IDENTIFIER. 3366 */ 3367 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3368 if (!dest_se_deve) { 3369 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3370 " %hu\n", dest_tf_ops->fabric_name, rtpi); 3371 ret = TCM_INVALID_PARAMETER_LIST; 3372 goto out; 3373 } 3374 3375 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3376 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3377 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3378 dest_se_deve = NULL; 3379 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3380 goto out; 3381 } 3382 3383 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3384 " ACL for dest_se_deve->mapped_lun: %llu\n", 3385 dest_tf_ops->fabric_name, dest_node_acl->initiatorname, 3386 dest_se_deve->mapped_lun); 3387 3388 /* 3389 * A persistent reservation needs to already existing in order to 3390 * successfully complete the REGISTER_AND_MOVE service action.. 3391 */ 3392 spin_lock(&dev->dev_reservation_lock); 3393 pr_res_holder = dev->dev_pr_res_holder; 3394 if (!pr_res_holder) { 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3396 " currently held\n"); 3397 spin_unlock(&dev->dev_reservation_lock); 3398 ret = TCM_INVALID_CDB_FIELD; 3399 goto out; 3400 } 3401 /* 3402 * The received on I_T Nexus must be the reservation holder. 3403 * 3404 * From spc4r17 section 5.7.8 Table 50 -- 3405 * Register behaviors for a REGISTER AND MOVE service action 3406 */ 3407 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3408 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3409 " Nexus is not reservation holder\n"); 3410 spin_unlock(&dev->dev_reservation_lock); 3411 ret = TCM_RESERVATION_CONFLICT; 3412 goto out; 3413 } 3414 /* 3415 * From spc4r17 section 5.7.8: registering and moving reservation 3416 * 3417 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3418 * action is received and the established persistent reservation is a 3419 * Write Exclusive - All Registrants type or Exclusive Access - 3420 * All Registrants type reservation, then the command shall be completed 3421 * with RESERVATION CONFLICT status. 3422 */ 3423 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3424 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3425 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3426 " reservation for type: %s\n", 3427 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3428 spin_unlock(&dev->dev_reservation_lock); 3429 ret = TCM_RESERVATION_CONFLICT; 3430 goto out; 3431 } 3432 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3433 /* 3434 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3435 */ 3436 type = pr_res_holder->pr_res_type; 3437 scope = pr_res_holder->pr_res_type; 3438 /* 3439 * c) Associate the reservation key specified in the SERVICE ACTION 3440 * RESERVATION KEY field with the I_T nexus specified as the 3441 * destination of the register and move, where: 3442 * A) The I_T nexus is specified by the TransportID and the 3443 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3444 * B) Regardless of the TransportID format used, the association for 3445 * the initiator port is based on either the initiator port name 3446 * (see 3.1.71) on SCSI transport protocols where port names are 3447 * required or the initiator port identifier (see 3.1.70) on SCSI 3448 * transport protocols where port names are not required; 3449 * d) Register the reservation key specified in the SERVICE ACTION 3450 * RESERVATION KEY field; 3451 * e) Retain the reservation key specified in the SERVICE ACTION 3452 * RESERVATION KEY field and associated information; 3453 * 3454 * Also, It is not an error for a REGISTER AND MOVE service action to 3455 * register an I_T nexus that is already registered with the same 3456 * reservation key or a different reservation key. 3457 */ 3458 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3459 iport_ptr); 3460 if (!dest_pr_reg) { 3461 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3462 kref_read(&dest_se_deve->pr_kref) != 0); 3463 3464 spin_unlock(&dev->dev_reservation_lock); 3465 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3466 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3467 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3468 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3469 goto out; 3470 } 3471 spin_lock(&dev->dev_reservation_lock); 3472 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3473 iport_ptr); 3474 new_reg = 1; 3475 } 3476 /* 3477 * f) Release the persistent reservation for the persistent reservation 3478 * holder (i.e., the I_T nexus on which the 3479 */ 3480 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3481 dev->dev_pr_res_holder, 0, 0); 3482 /* 3483 * g) Move the persistent reservation to the specified I_T nexus using 3484 * the same scope and type as the persistent reservation released in 3485 * item f); and 3486 */ 3487 dev->dev_pr_res_holder = dest_pr_reg; 3488 dest_pr_reg->pr_res_holder = 1; 3489 dest_pr_reg->pr_res_type = type; 3490 pr_reg->pr_res_scope = scope; 3491 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3492 /* 3493 * Increment PRGeneration for existing registrations.. 3494 */ 3495 if (!new_reg) 3496 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3497 spin_unlock(&dev->dev_reservation_lock); 3498 3499 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3500 " created new reservation holder TYPE: %s on object RTPI:" 3501 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, 3502 core_scsi3_pr_dump_type(type), rtpi, 3503 dest_pr_reg->pr_res_generation); 3504 pr_debug("SPC-3 PR Successfully moved reservation from" 3505 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3506 tf_ops->fabric_name, pr_reg_nacl->initiatorname, 3507 i_buf, dest_tf_ops->fabric_name, 3508 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3509 iport_ptr : ""); 3510 /* 3511 * It is now safe to release configfs group dependencies for destination 3512 * of Transport ID Initiator Device/Port Identifier 3513 */ 3514 core_scsi3_lunacl_undepend_item(dest_se_deve); 3515 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3516 core_scsi3_tpg_undepend_item(dest_se_tpg); 3517 /* 3518 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3519 * nexus on which PERSISTENT RESERVE OUT command was received. 3520 */ 3521 if (unreg) { 3522 spin_lock(&pr_tmpl->registration_lock); 3523 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3524 spin_unlock(&pr_tmpl->registration_lock); 3525 } else 3526 core_scsi3_put_pr_reg(pr_reg); 3527 3528 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3529 3530 core_scsi3_put_pr_reg(dest_pr_reg); 3531 return 0; 3532 out: 3533 if (buf) 3534 transport_kunmap_data_sg(cmd); 3535 if (dest_se_deve) 3536 core_scsi3_lunacl_undepend_item(dest_se_deve); 3537 if (dest_node_acl) 3538 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3539 core_scsi3_tpg_undepend_item(dest_se_tpg); 3540 3541 out_put_pr_reg: 3542 core_scsi3_put_pr_reg(pr_reg); 3543 return ret; 3544 } 3545 3546 /* 3547 * See spc4r17 section 6.14 Table 170 3548 */ 3549 sense_reason_t 3550 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3551 { 3552 struct se_device *dev = cmd->se_dev; 3553 unsigned char *cdb = &cmd->t_task_cdb[0]; 3554 unsigned char *buf; 3555 u64 res_key, sa_res_key; 3556 int sa, scope, type, aptpl; 3557 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3558 sense_reason_t ret; 3559 3560 /* 3561 * Following spc2r20 5.5.1 Reservations overview: 3562 * 3563 * If a logical unit has been reserved by any RESERVE command and is 3564 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3565 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3566 * initiator or service action and shall terminate with a RESERVATION 3567 * CONFLICT status. 3568 */ 3569 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3570 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3571 " SPC-2 reservation is held, returning" 3572 " RESERVATION_CONFLICT\n"); 3573 return TCM_RESERVATION_CONFLICT; 3574 } 3575 3576 /* 3577 * FIXME: A NULL struct se_session pointer means an this is not coming from 3578 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3579 */ 3580 if (!cmd->se_sess) 3581 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3582 3583 if (cmd->data_length < 24) { 3584 pr_warn("SPC-PR: Received PR OUT parameter list" 3585 " length too small: %u\n", cmd->data_length); 3586 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3587 } 3588 3589 /* 3590 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3591 */ 3592 sa = (cdb[1] & 0x1f); 3593 scope = (cdb[2] & 0xf0); 3594 type = (cdb[2] & 0x0f); 3595 3596 buf = transport_kmap_data_sg(cmd); 3597 if (!buf) 3598 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3599 3600 /* 3601 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3602 */ 3603 res_key = get_unaligned_be64(&buf[0]); 3604 sa_res_key = get_unaligned_be64(&buf[8]); 3605 /* 3606 * REGISTER_AND_MOVE uses a different SA parameter list containing 3607 * SCSI TransportIDs. 3608 */ 3609 if (sa != PRO_REGISTER_AND_MOVE) { 3610 spec_i_pt = (buf[20] & 0x08); 3611 all_tg_pt = (buf[20] & 0x04); 3612 aptpl = (buf[20] & 0x01); 3613 } else { 3614 aptpl = (buf[17] & 0x01); 3615 unreg = (buf[17] & 0x02); 3616 } 3617 /* 3618 * If the backend device has been configured to force APTPL metadata 3619 * write-out, go ahead and propigate aptpl=1 down now. 3620 */ 3621 if (dev->dev_attrib.force_pr_aptpl) 3622 aptpl = 1; 3623 3624 transport_kunmap_data_sg(cmd); 3625 buf = NULL; 3626 3627 /* 3628 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3629 */ 3630 if (spec_i_pt && (sa != PRO_REGISTER)) 3631 return TCM_INVALID_PARAMETER_LIST; 3632 3633 /* 3634 * From spc4r17 section 6.14: 3635 * 3636 * If the SPEC_I_PT bit is set to zero, the service action is not 3637 * REGISTER AND MOVE, and the parameter list length is not 24, then 3638 * the command shall be terminated with CHECK CONDITION status, with 3639 * the sense key set to ILLEGAL REQUEST, and the additional sense 3640 * code set to PARAMETER LIST LENGTH ERROR. 3641 */ 3642 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3643 (cmd->data_length != 24)) { 3644 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3645 " list length: %u\n", cmd->data_length); 3646 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3647 } 3648 3649 /* 3650 * (core_scsi3_emulate_pro_* function parameters 3651 * are defined by spc4r17 Table 174: 3652 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3653 */ 3654 switch (sa) { 3655 case PRO_REGISTER: 3656 ret = core_scsi3_emulate_pro_register(cmd, 3657 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3658 break; 3659 case PRO_RESERVE: 3660 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3661 break; 3662 case PRO_RELEASE: 3663 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3664 break; 3665 case PRO_CLEAR: 3666 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3667 break; 3668 case PRO_PREEMPT: 3669 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3670 res_key, sa_res_key, PREEMPT); 3671 break; 3672 case PRO_PREEMPT_AND_ABORT: 3673 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3674 res_key, sa_res_key, PREEMPT_AND_ABORT); 3675 break; 3676 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3677 ret = core_scsi3_emulate_pro_register(cmd, 3678 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3679 break; 3680 case PRO_REGISTER_AND_MOVE: 3681 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3682 sa_res_key, aptpl, unreg); 3683 break; 3684 default: 3685 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3686 " action: 0x%02x\n", sa); 3687 return TCM_INVALID_CDB_FIELD; 3688 } 3689 3690 if (!ret) 3691 target_complete_cmd(cmd, GOOD); 3692 return ret; 3693 } 3694 3695 /* 3696 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3697 * 3698 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3699 */ 3700 static sense_reason_t 3701 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3702 { 3703 struct se_device *dev = cmd->se_dev; 3704 struct t10_pr_registration *pr_reg; 3705 unsigned char *buf; 3706 u32 add_len = 0, off = 8; 3707 3708 if (cmd->data_length < 8) { 3709 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3710 " too small\n", cmd->data_length); 3711 return TCM_INVALID_CDB_FIELD; 3712 } 3713 3714 buf = transport_kmap_data_sg(cmd); 3715 if (!buf) 3716 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3717 3718 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3719 3720 spin_lock(&dev->t10_pr.registration_lock); 3721 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3722 pr_reg_list) { 3723 /* 3724 * Check for overflow of 8byte PRI READ_KEYS payload and 3725 * next reservation key list descriptor. 3726 */ 3727 if (off + 8 <= cmd->data_length) { 3728 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3729 off += 8; 3730 } 3731 /* 3732 * SPC5r17: 6.16.2 READ KEYS service action 3733 * The ADDITIONAL LENGTH field indicates the number of bytes in 3734 * the Reservation key list. The contents of the ADDITIONAL 3735 * LENGTH field are not altered based on the allocation length 3736 */ 3737 add_len += 8; 3738 } 3739 spin_unlock(&dev->t10_pr.registration_lock); 3740 3741 put_unaligned_be32(add_len, &buf[4]); 3742 3743 transport_kunmap_data_sg(cmd); 3744 3745 return 0; 3746 } 3747 3748 /* 3749 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3750 * 3751 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3752 */ 3753 static sense_reason_t 3754 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3755 { 3756 struct se_device *dev = cmd->se_dev; 3757 struct t10_pr_registration *pr_reg; 3758 unsigned char *buf; 3759 u64 pr_res_key; 3760 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3761 3762 if (cmd->data_length < 8) { 3763 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3764 " too small\n", cmd->data_length); 3765 return TCM_INVALID_CDB_FIELD; 3766 } 3767 3768 buf = transport_kmap_data_sg(cmd); 3769 if (!buf) 3770 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3771 3772 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3773 3774 spin_lock(&dev->dev_reservation_lock); 3775 pr_reg = dev->dev_pr_res_holder; 3776 if (pr_reg) { 3777 /* 3778 * Set the hardcoded Additional Length 3779 */ 3780 put_unaligned_be32(add_len, &buf[4]); 3781 3782 if (cmd->data_length < 22) 3783 goto err; 3784 3785 /* 3786 * Set the Reservation key. 3787 * 3788 * From spc4r17, section 5.7.10: 3789 * A persistent reservation holder has its reservation key 3790 * returned in the parameter data from a PERSISTENT 3791 * RESERVE IN command with READ RESERVATION service action as 3792 * follows: 3793 * a) For a persistent reservation of the type Write Exclusive 3794 * - All Registrants or Exclusive Access All Regitrants, 3795 * the reservation key shall be set to zero; or 3796 * b) For all other persistent reservation types, the 3797 * reservation key shall be set to the registered 3798 * reservation key for the I_T nexus that holds the 3799 * persistent reservation. 3800 */ 3801 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3802 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3803 pr_res_key = 0; 3804 else 3805 pr_res_key = pr_reg->pr_res_key; 3806 3807 put_unaligned_be64(pr_res_key, &buf[8]); 3808 /* 3809 * Set the SCOPE and TYPE 3810 */ 3811 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3812 (pr_reg->pr_res_type & 0x0f); 3813 } 3814 3815 err: 3816 spin_unlock(&dev->dev_reservation_lock); 3817 transport_kunmap_data_sg(cmd); 3818 3819 return 0; 3820 } 3821 3822 /* 3823 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3824 * 3825 * See spc4r17 section 6.13.4 Table 165 3826 */ 3827 static sense_reason_t 3828 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3829 { 3830 struct se_device *dev = cmd->se_dev; 3831 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3832 unsigned char *buf; 3833 u16 add_len = 8; /* Hardcoded to 8. */ 3834 3835 if (cmd->data_length < 6) { 3836 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3837 " %u too small\n", cmd->data_length); 3838 return TCM_INVALID_CDB_FIELD; 3839 } 3840 3841 buf = transport_kmap_data_sg(cmd); 3842 if (!buf) 3843 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3844 3845 put_unaligned_be16(add_len, &buf[0]); 3846 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3847 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3848 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3849 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3850 /* 3851 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3852 * set the TMV: Task Mask Valid bit. 3853 */ 3854 buf[3] |= 0x80; 3855 /* 3856 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3857 */ 3858 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3859 /* 3860 * PTPL_A: Persistence across Target Power Loss Active bit 3861 */ 3862 if (pr_tmpl->pr_aptpl_active) 3863 buf[3] |= 0x01; 3864 /* 3865 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3866 */ 3867 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3868 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3869 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3870 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3871 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3872 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3873 3874 transport_kunmap_data_sg(cmd); 3875 3876 return 0; 3877 } 3878 3879 /* 3880 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3881 * 3882 * See spc4r17 section 6.13.5 Table 168 and 169 3883 */ 3884 static sense_reason_t 3885 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3886 { 3887 struct se_device *dev = cmd->se_dev; 3888 struct se_node_acl *se_nacl; 3889 struct se_portal_group *se_tpg; 3890 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3891 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3892 unsigned char *buf; 3893 u32 add_desc_len = 0, add_len = 0; 3894 u32 off = 8; /* off into first Full Status descriptor */ 3895 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3896 int exp_desc_len, desc_len; 3897 bool all_reg = false; 3898 3899 if (cmd->data_length < 8) { 3900 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3901 " too small\n", cmd->data_length); 3902 return TCM_INVALID_CDB_FIELD; 3903 } 3904 3905 buf = transport_kmap_data_sg(cmd); 3906 if (!buf) 3907 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3908 3909 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3910 3911 spin_lock(&dev->dev_reservation_lock); 3912 if (dev->dev_pr_res_holder) { 3913 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3914 3915 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3916 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3917 all_reg = true; 3918 pr_res_type = pr_holder->pr_res_type; 3919 pr_res_scope = pr_holder->pr_res_scope; 3920 } 3921 } 3922 spin_unlock(&dev->dev_reservation_lock); 3923 3924 spin_lock(&pr_tmpl->registration_lock); 3925 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3926 &pr_tmpl->registration_list, pr_reg_list) { 3927 3928 se_nacl = pr_reg->pr_reg_nacl; 3929 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3930 add_desc_len = 0; 3931 3932 atomic_inc_mb(&pr_reg->pr_res_holders); 3933 spin_unlock(&pr_tmpl->registration_lock); 3934 /* 3935 * Determine expected length of $FABRIC_MOD specific 3936 * TransportID full status descriptor.. 3937 */ 3938 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3939 &format_code); 3940 if (exp_desc_len < 0 || 3941 exp_desc_len + add_len > cmd->data_length) { 3942 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3943 " out of buffer: %d\n", cmd->data_length); 3944 spin_lock(&pr_tmpl->registration_lock); 3945 atomic_dec_mb(&pr_reg->pr_res_holders); 3946 break; 3947 } 3948 /* 3949 * Set RESERVATION KEY 3950 */ 3951 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3952 off += 8; 3953 off += 4; /* Skip Over Reserved area */ 3954 3955 /* 3956 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3957 */ 3958 if (pr_reg->pr_reg_all_tg_pt) 3959 buf[off] = 0x02; 3960 /* 3961 * The struct se_lun pointer will be present for the 3962 * reservation holder for PR_HOLDER bit. 3963 * 3964 * Also, if this registration is the reservation 3965 * holder or there is an All Registrants reservation 3966 * active, fill in SCOPE and TYPE in the next byte. 3967 */ 3968 if (pr_reg->pr_res_holder) { 3969 buf[off++] |= 0x01; 3970 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3971 (pr_reg->pr_res_type & 0x0f); 3972 } else if (all_reg) { 3973 buf[off++] |= 0x01; 3974 buf[off++] = (pr_res_scope & 0xf0) | 3975 (pr_res_type & 0x0f); 3976 } else { 3977 off += 2; 3978 } 3979 3980 off += 4; /* Skip over reserved area */ 3981 /* 3982 * From spc4r17 6.3.15: 3983 * 3984 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3985 * IDENTIFIER field contains the relative port identifier (see 3986 * 3.1.120) of the target port that is part of the I_T nexus 3987 * described by this full status descriptor. If the ALL_TG_PT 3988 * bit is set to one, the contents of the RELATIVE TARGET PORT 3989 * IDENTIFIER field are not defined by this standard. 3990 */ 3991 if (!pr_reg->pr_reg_all_tg_pt) { 3992 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 3993 3994 put_unaligned_be16(sep_rtpi, &buf[off]); 3995 off += 2; 3996 } else 3997 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3998 3999 buf[off+4] = se_tpg->proto_id; 4000 4001 /* 4002 * Now, have the $FABRIC_MOD fill in the transport ID. 4003 */ 4004 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4005 &format_code, &buf[off+4]); 4006 4007 spin_lock(&pr_tmpl->registration_lock); 4008 atomic_dec_mb(&pr_reg->pr_res_holders); 4009 4010 if (desc_len < 0) 4011 break; 4012 /* 4013 * Set the ADDITIONAL DESCRIPTOR LENGTH 4014 */ 4015 put_unaligned_be32(desc_len, &buf[off]); 4016 off += 4; 4017 /* 4018 * Size of full desctipor header minus TransportID 4019 * containing $FABRIC_MOD specific) initiator device/port 4020 * WWN information. 4021 * 4022 * See spc4r17 Section 6.13.5 Table 169 4023 */ 4024 add_desc_len = (24 + desc_len); 4025 4026 off += desc_len; 4027 add_len += add_desc_len; 4028 } 4029 spin_unlock(&pr_tmpl->registration_lock); 4030 /* 4031 * Set ADDITIONAL_LENGTH 4032 */ 4033 put_unaligned_be32(add_len, &buf[4]); 4034 4035 transport_kunmap_data_sg(cmd); 4036 4037 return 0; 4038 } 4039 4040 sense_reason_t 4041 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4042 { 4043 sense_reason_t ret; 4044 4045 /* 4046 * Following spc2r20 5.5.1 Reservations overview: 4047 * 4048 * If a logical unit has been reserved by any RESERVE command and is 4049 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4050 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4051 * initiator or service action and shall terminate with a RESERVATION 4052 * CONFLICT status. 4053 */ 4054 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4055 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4056 " SPC-2 reservation is held, returning" 4057 " RESERVATION_CONFLICT\n"); 4058 return TCM_RESERVATION_CONFLICT; 4059 } 4060 4061 switch (cmd->t_task_cdb[1] & 0x1f) { 4062 case PRI_READ_KEYS: 4063 ret = core_scsi3_pri_read_keys(cmd); 4064 break; 4065 case PRI_READ_RESERVATION: 4066 ret = core_scsi3_pri_read_reservation(cmd); 4067 break; 4068 case PRI_REPORT_CAPABILITIES: 4069 ret = core_scsi3_pri_report_capabilities(cmd); 4070 break; 4071 case PRI_READ_FULL_STATUS: 4072 ret = core_scsi3_pri_read_full_status(cmd); 4073 break; 4074 default: 4075 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4076 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4077 return TCM_INVALID_CDB_FIELD; 4078 } 4079 4080 if (!ret) 4081 target_complete_cmd(cmd, GOOD); 4082 return ret; 4083 } 4084 4085 sense_reason_t 4086 target_check_reservation(struct se_cmd *cmd) 4087 { 4088 struct se_device *dev = cmd->se_dev; 4089 sense_reason_t ret; 4090 4091 if (!cmd->se_sess) 4092 return 0; 4093 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4094 return 0; 4095 if (!dev->dev_attrib.emulate_pr) 4096 return 0; 4097 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4098 return 0; 4099 4100 spin_lock(&dev->dev_reservation_lock); 4101 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4102 ret = target_scsi2_reservation_check(cmd); 4103 else 4104 ret = target_scsi3_pr_reservation_check(cmd); 4105 spin_unlock(&dev->dev_reservation_lock); 4106 4107 return ret; 4108 } 4109