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 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 65 } 66 67 enum register_type { 68 REGISTER, 69 REGISTER_AND_IGNORE_EXISTING_KEY, 70 REGISTER_AND_MOVE, 71 }; 72 73 enum preempt_type { 74 PREEMPT, 75 PREEMPT_AND_ABORT, 76 }; 77 78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 79 struct t10_pr_registration *, int, int); 80 81 static int is_reservation_holder( 82 struct t10_pr_registration *pr_res_holder, 83 struct t10_pr_registration *pr_reg) 84 { 85 int pr_res_type; 86 87 if (pr_res_holder) { 88 pr_res_type = pr_res_holder->pr_res_type; 89 90 return pr_res_holder == pr_reg || 91 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 92 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 93 } 94 return 0; 95 } 96 97 static sense_reason_t 98 target_scsi2_reservation_check(struct se_cmd *cmd) 99 { 100 struct se_device *dev = cmd->se_dev; 101 struct se_session *sess = cmd->se_sess; 102 103 switch (cmd->t_task_cdb[0]) { 104 case INQUIRY: 105 case RELEASE: 106 case RELEASE_10: 107 return 0; 108 default: 109 break; 110 } 111 112 if (!dev->dev_reserved_node_acl || !sess) 113 return 0; 114 115 if (dev->dev_reserved_node_acl != sess->se_node_acl) 116 return TCM_RESERVATION_CONFLICT; 117 118 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 119 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 120 return TCM_RESERVATION_CONFLICT; 121 } 122 123 return 0; 124 } 125 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 127 struct se_node_acl *, struct se_session *); 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 129 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 131 { 132 struct se_session *se_sess = cmd->se_sess; 133 struct se_device *dev = cmd->se_dev; 134 struct t10_pr_registration *pr_reg; 135 struct t10_reservation *pr_tmpl = &dev->t10_pr; 136 int conflict = 0; 137 138 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 139 se_sess); 140 if (pr_reg) { 141 /* 142 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 143 * behavior 144 * 145 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 146 * status, but no reservation shall be established and the 147 * persistent reservation shall not be changed, if the command 148 * is received from a) and b) below. 149 * 150 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 151 * status, but the persistent reservation shall not be released, 152 * if the command is received from a) and b) 153 * 154 * a) An I_T nexus that is a persistent reservation holder; or 155 * b) An I_T nexus that is registered if a registrants only or 156 * all registrants type persistent reservation is present. 157 * 158 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 159 * RELEASE(6) command, or RELEASE(10) command shall be processed 160 * as defined in SPC-2. 161 */ 162 if (pr_reg->pr_res_holder) { 163 core_scsi3_put_pr_reg(pr_reg); 164 return 1; 165 } 166 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 168 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 169 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 170 core_scsi3_put_pr_reg(pr_reg); 171 return 1; 172 } 173 core_scsi3_put_pr_reg(pr_reg); 174 conflict = 1; 175 } else { 176 /* 177 * Following spc2r20 5.5.1 Reservations overview: 178 * 179 * If a logical unit has executed a PERSISTENT RESERVE OUT 180 * command with the REGISTER or the REGISTER AND IGNORE 181 * EXISTING KEY service action and is still registered by any 182 * initiator, all RESERVE commands and all RELEASE commands 183 * regardless of initiator shall conflict and shall terminate 184 * with a RESERVATION CONFLICT status. 185 */ 186 spin_lock(&pr_tmpl->registration_lock); 187 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 188 spin_unlock(&pr_tmpl->registration_lock); 189 } 190 191 if (conflict) { 192 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 193 " while active SPC-3 registrations exist," 194 " returning RESERVATION_CONFLICT\n"); 195 return -EBUSY; 196 } 197 198 return 0; 199 } 200 201 sense_reason_t 202 target_scsi2_reservation_release(struct se_cmd *cmd) 203 { 204 struct se_device *dev = cmd->se_dev; 205 struct se_session *sess = cmd->se_sess; 206 struct se_portal_group *tpg; 207 int rc; 208 209 if (!sess || !sess->se_tpg) 210 goto out; 211 rc = target_check_scsi2_reservation_conflict(cmd); 212 if (rc == 1) 213 goto out; 214 if (rc < 0) 215 return TCM_RESERVATION_CONFLICT; 216 217 spin_lock(&dev->dev_reservation_lock); 218 if (!dev->dev_reserved_node_acl || !sess) 219 goto out_unlock; 220 221 if (dev->dev_reserved_node_acl != sess->se_node_acl) 222 goto out_unlock; 223 224 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 225 goto out_unlock; 226 227 dev->dev_reserved_node_acl = NULL; 228 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 229 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 230 dev->dev_res_bin_isid = 0; 231 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 232 } 233 tpg = sess->se_tpg; 234 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 235 " MAPPED LUN: %llu for %s\n", 236 tpg->se_tpg_tfo->get_fabric_name(), 237 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 238 sess->se_node_acl->initiatorname); 239 240 out_unlock: 241 spin_unlock(&dev->dev_reservation_lock); 242 out: 243 target_complete_cmd(cmd, GOOD); 244 return 0; 245 } 246 247 sense_reason_t 248 target_scsi2_reservation_reserve(struct se_cmd *cmd) 249 { 250 struct se_device *dev = cmd->se_dev; 251 struct se_session *sess = cmd->se_sess; 252 struct se_portal_group *tpg; 253 sense_reason_t ret = 0; 254 int rc; 255 256 if ((cmd->t_task_cdb[1] & 0x01) && 257 (cmd->t_task_cdb[1] & 0x02)) { 258 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 259 return TCM_UNSUPPORTED_SCSI_OPCODE; 260 } 261 /* 262 * This is currently the case for target_core_mod passthrough struct se_cmd 263 * ops 264 */ 265 if (!sess || !sess->se_tpg) 266 goto out; 267 rc = target_check_scsi2_reservation_conflict(cmd); 268 if (rc == 1) 269 goto out; 270 271 if (rc < 0) 272 return TCM_RESERVATION_CONFLICT; 273 274 tpg = sess->se_tpg; 275 spin_lock(&dev->dev_reservation_lock); 276 if (dev->dev_reserved_node_acl && 277 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 278 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 279 tpg->se_tpg_tfo->get_fabric_name()); 280 pr_err("Original reserver LUN: %llu %s\n", 281 cmd->se_lun->unpacked_lun, 282 dev->dev_reserved_node_acl->initiatorname); 283 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 284 " from %s \n", cmd->se_lun->unpacked_lun, 285 cmd->orig_fe_lun, 286 sess->se_node_acl->initiatorname); 287 ret = TCM_RESERVATION_CONFLICT; 288 goto out_unlock; 289 } 290 291 dev->dev_reserved_node_acl = sess->se_node_acl; 292 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 293 if (sess->sess_bin_isid != 0) { 294 dev->dev_res_bin_isid = sess->sess_bin_isid; 295 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 296 } 297 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 298 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 299 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 300 sess->se_node_acl->initiatorname); 301 302 out_unlock: 303 spin_unlock(&dev->dev_reservation_lock); 304 out: 305 if (!ret) 306 target_complete_cmd(cmd, GOOD); 307 return ret; 308 } 309 310 311 /* 312 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 313 * 314 * This function is called by those initiator ports who are *NOT* 315 * the active PR reservation holder when a reservation is present. 316 */ 317 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 318 bool isid_mismatch) 319 { 320 unsigned char *cdb = cmd->t_task_cdb; 321 struct se_session *se_sess = cmd->se_sess; 322 struct se_node_acl *nacl = se_sess->se_node_acl; 323 int other_cdb = 0; 324 int registered_nexus = 0, ret = 1; /* Conflict by default */ 325 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 326 int we = 0; /* Write Exclusive */ 327 int legacy = 0; /* Act like a legacy device and return 328 * RESERVATION CONFLICT on some CDBs */ 329 330 if (isid_mismatch) { 331 registered_nexus = 0; 332 } else { 333 struct se_dev_entry *se_deve; 334 335 rcu_read_lock(); 336 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 337 if (se_deve) 338 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 339 &se_deve->deve_flags); 340 rcu_read_unlock(); 341 } 342 343 switch (pr_reg_type) { 344 case PR_TYPE_WRITE_EXCLUSIVE: 345 we = 1; 346 case PR_TYPE_EXCLUSIVE_ACCESS: 347 /* 348 * Some commands are only allowed for the persistent reservation 349 * holder. 350 */ 351 break; 352 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 353 we = 1; 354 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 355 /* 356 * Some commands are only allowed for registered I_T Nexuses. 357 */ 358 reg_only = 1; 359 break; 360 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 361 we = 1; 362 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 363 /* 364 * Each registered I_T Nexus is a reservation holder. 365 */ 366 all_reg = 1; 367 break; 368 default: 369 return -EINVAL; 370 } 371 /* 372 * Referenced from spc4r17 table 45 for *NON* PR holder access 373 */ 374 switch (cdb[0]) { 375 case SECURITY_PROTOCOL_IN: 376 if (registered_nexus) 377 return 0; 378 ret = (we) ? 0 : 1; 379 break; 380 case MODE_SENSE: 381 case MODE_SENSE_10: 382 case READ_ATTRIBUTE: 383 case READ_BUFFER: 384 case RECEIVE_DIAGNOSTIC: 385 if (legacy) { 386 ret = 1; 387 break; 388 } 389 if (registered_nexus) { 390 ret = 0; 391 break; 392 } 393 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 394 break; 395 case PERSISTENT_RESERVE_OUT: 396 /* 397 * This follows PERSISTENT_RESERVE_OUT service actions that 398 * are allowed in the presence of various reservations. 399 * See spc4r17, table 46 400 */ 401 switch (cdb[1] & 0x1f) { 402 case PRO_CLEAR: 403 case PRO_PREEMPT: 404 case PRO_PREEMPT_AND_ABORT: 405 ret = (registered_nexus) ? 0 : 1; 406 break; 407 case PRO_REGISTER: 408 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 409 ret = 0; 410 break; 411 case PRO_REGISTER_AND_MOVE: 412 case PRO_RESERVE: 413 ret = 1; 414 break; 415 case PRO_RELEASE: 416 ret = (registered_nexus) ? 0 : 1; 417 break; 418 default: 419 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 420 " action: 0x%02x\n", cdb[1] & 0x1f); 421 return -EINVAL; 422 } 423 break; 424 case RELEASE: 425 case RELEASE_10: 426 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 427 ret = 0; 428 break; 429 case RESERVE: 430 case RESERVE_10: 431 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 432 ret = 0; 433 break; 434 case TEST_UNIT_READY: 435 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 436 break; 437 case MAINTENANCE_IN: 438 switch (cdb[1] & 0x1f) { 439 case MI_MANAGEMENT_PROTOCOL_IN: 440 if (registered_nexus) { 441 ret = 0; 442 break; 443 } 444 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 445 break; 446 case MI_REPORT_SUPPORTED_OPERATION_CODES: 447 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 448 if (legacy) { 449 ret = 1; 450 break; 451 } 452 if (registered_nexus) { 453 ret = 0; 454 break; 455 } 456 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 457 break; 458 case MI_REPORT_ALIASES: 459 case MI_REPORT_IDENTIFYING_INFORMATION: 460 case MI_REPORT_PRIORITY: 461 case MI_REPORT_TARGET_PGS: 462 case MI_REPORT_TIMESTAMP: 463 ret = 0; /* Allowed */ 464 break; 465 default: 466 pr_err("Unknown MI Service Action: 0x%02x\n", 467 (cdb[1] & 0x1f)); 468 return -EINVAL; 469 } 470 break; 471 case ACCESS_CONTROL_IN: 472 case ACCESS_CONTROL_OUT: 473 case INQUIRY: 474 case LOG_SENSE: 475 case SERVICE_ACTION_IN_12: 476 case REPORT_LUNS: 477 case REQUEST_SENSE: 478 case PERSISTENT_RESERVE_IN: 479 ret = 0; /*/ Allowed CDBs */ 480 break; 481 default: 482 other_cdb = 1; 483 break; 484 } 485 /* 486 * Case where the CDB is explicitly allowed in the above switch 487 * statement. 488 */ 489 if (!ret && !other_cdb) { 490 pr_debug("Allowing explicit CDB: 0x%02x for %s" 491 " reservation holder\n", cdb[0], 492 core_scsi3_pr_dump_type(pr_reg_type)); 493 494 return ret; 495 } 496 /* 497 * Check if write exclusive initiator ports *NOT* holding the 498 * WRITE_EXCLUSIVE_* reservation. 499 */ 500 if (we && !registered_nexus) { 501 if (cmd->data_direction == DMA_TO_DEVICE) { 502 /* 503 * Conflict for write exclusive 504 */ 505 pr_debug("%s Conflict for unregistered nexus" 506 " %s CDB: 0x%02x to %s reservation\n", 507 transport_dump_cmd_direction(cmd), 508 se_sess->se_node_acl->initiatorname, cdb[0], 509 core_scsi3_pr_dump_type(pr_reg_type)); 510 return 1; 511 } else { 512 /* 513 * Allow non WRITE CDBs for all Write Exclusive 514 * PR TYPEs to pass for registered and 515 * non-registered_nexuxes NOT holding the reservation. 516 * 517 * We only make noise for the unregisterd nexuses, 518 * as we expect registered non-reservation holding 519 * nexuses to issue CDBs. 520 */ 521 522 if (!registered_nexus) { 523 pr_debug("Allowing implicit CDB: 0x%02x" 524 " for %s reservation on unregistered" 525 " nexus\n", cdb[0], 526 core_scsi3_pr_dump_type(pr_reg_type)); 527 } 528 529 return 0; 530 } 531 } else if ((reg_only) || (all_reg)) { 532 if (registered_nexus) { 533 /* 534 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 535 * allow commands from registered nexuses. 536 */ 537 538 pr_debug("Allowing implicit CDB: 0x%02x for %s" 539 " reservation\n", cdb[0], 540 core_scsi3_pr_dump_type(pr_reg_type)); 541 542 return 0; 543 } 544 } else if (we && registered_nexus) { 545 /* 546 * Reads are allowed for Write Exclusive locks 547 * from all registrants. 548 */ 549 if (cmd->data_direction == DMA_FROM_DEVICE) { 550 pr_debug("Allowing READ CDB: 0x%02x for %s" 551 " reservation\n", cdb[0], 552 core_scsi3_pr_dump_type(pr_reg_type)); 553 554 return 0; 555 } 556 } 557 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 558 " for %s reservation\n", transport_dump_cmd_direction(cmd), 559 (registered_nexus) ? "" : "un", 560 se_sess->se_node_acl->initiatorname, cdb[0], 561 core_scsi3_pr_dump_type(pr_reg_type)); 562 563 return 1; /* Conflict by default */ 564 } 565 566 static sense_reason_t 567 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 568 { 569 struct se_device *dev = cmd->se_dev; 570 struct se_session *sess = cmd->se_sess; 571 u32 pr_reg_type; 572 bool isid_mismatch = false; 573 574 if (!dev->dev_pr_res_holder) 575 return 0; 576 577 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 578 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 579 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 580 goto check_nonholder; 581 582 if (dev->dev_pr_res_holder->isid_present_at_reg) { 583 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 584 sess->sess_bin_isid) { 585 isid_mismatch = true; 586 goto check_nonholder; 587 } 588 } 589 590 return 0; 591 592 check_nonholder: 593 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 594 return TCM_RESERVATION_CONFLICT; 595 return 0; 596 } 597 598 static u32 core_scsi3_pr_generation(struct se_device *dev) 599 { 600 u32 prg; 601 602 /* 603 * PRGeneration field shall contain the value of a 32-bit wrapping 604 * counter mainted by the device server. 605 * 606 * Note that this is done regardless of Active Persist across 607 * Target PowerLoss (APTPL) 608 * 609 * See spc4r17 section 6.3.12 READ_KEYS service action 610 */ 611 spin_lock(&dev->dev_reservation_lock); 612 prg = dev->t10_pr.pr_generation++; 613 spin_unlock(&dev->dev_reservation_lock); 614 615 return prg; 616 } 617 618 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 619 struct se_device *dev, 620 struct se_node_acl *nacl, 621 struct se_lun *lun, 622 struct se_dev_entry *dest_deve, 623 u64 mapped_lun, 624 unsigned char *isid, 625 u64 sa_res_key, 626 int all_tg_pt, 627 int aptpl) 628 { 629 struct t10_pr_registration *pr_reg; 630 631 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 632 if (!pr_reg) { 633 pr_err("Unable to allocate struct t10_pr_registration\n"); 634 return NULL; 635 } 636 637 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 641 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 642 atomic_set(&pr_reg->pr_res_holders, 0); 643 pr_reg->pr_reg_nacl = nacl; 644 /* 645 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 646 * the se_dev_entry->pr_ref will have been already obtained by 647 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 648 * 649 * Otherwise, locate se_dev_entry now and obtain a reference until 650 * registration completes in __core_scsi3_add_registration(). 651 */ 652 if (dest_deve) { 653 pr_reg->pr_reg_deve = dest_deve; 654 } else { 655 rcu_read_lock(); 656 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 657 if (!pr_reg->pr_reg_deve) { 658 rcu_read_unlock(); 659 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 660 nacl->initiatorname, mapped_lun); 661 kmem_cache_free(t10_pr_reg_cache, pr_reg); 662 return NULL; 663 } 664 kref_get(&pr_reg->pr_reg_deve->pr_kref); 665 rcu_read_unlock(); 666 } 667 pr_reg->pr_res_mapped_lun = mapped_lun; 668 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 669 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 670 pr_reg->pr_res_key = sa_res_key; 671 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 672 pr_reg->pr_reg_aptpl = aptpl; 673 /* 674 * If an ISID value for this SCSI Initiator Port exists, 675 * save it to the registration now. 676 */ 677 if (isid != NULL) { 678 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 679 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 680 pr_reg->isid_present_at_reg = 1; 681 } 682 683 return pr_reg; 684 } 685 686 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 687 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 688 689 /* 690 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 691 * modes. 692 */ 693 static struct t10_pr_registration *__core_scsi3_alloc_registration( 694 struct se_device *dev, 695 struct se_node_acl *nacl, 696 struct se_lun *lun, 697 struct se_dev_entry *deve, 698 u64 mapped_lun, 699 unsigned char *isid, 700 u64 sa_res_key, 701 int all_tg_pt, 702 int aptpl) 703 { 704 struct se_dev_entry *deve_tmp; 705 struct se_node_acl *nacl_tmp; 706 struct se_lun_acl *lacl_tmp; 707 struct se_lun *lun_tmp, *next, *dest_lun; 708 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 709 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 710 int ret; 711 /* 712 * Create a registration for the I_T Nexus upon which the 713 * PROUT REGISTER was received. 714 */ 715 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 716 isid, sa_res_key, all_tg_pt, 717 aptpl); 718 if (!pr_reg) 719 return NULL; 720 /* 721 * Return pointer to pr_reg for ALL_TG_PT=0 722 */ 723 if (!all_tg_pt) 724 return pr_reg; 725 /* 726 * Create list of matching SCSI Initiator Port registrations 727 * for ALL_TG_PT=1 728 */ 729 spin_lock(&dev->se_port_lock); 730 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 731 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 732 continue; 733 spin_unlock(&dev->se_port_lock); 734 735 spin_lock(&lun_tmp->lun_deve_lock); 736 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 737 /* 738 * This pointer will be NULL for demo mode MappedLUNs 739 * that have not been make explicit via a ConfigFS 740 * MappedLUN group for the SCSI Initiator Node ACL. 741 */ 742 if (!deve_tmp->se_lun_acl) 743 continue; 744 745 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 746 lockdep_is_held(&lun_tmp->lun_deve_lock)); 747 nacl_tmp = lacl_tmp->se_lun_nacl; 748 /* 749 * Skip the matching struct se_node_acl that is allocated 750 * above.. 751 */ 752 if (nacl == nacl_tmp) 753 continue; 754 /* 755 * Only perform PR registrations for target ports on 756 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 757 * arrived. 758 */ 759 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 760 continue; 761 /* 762 * Look for a matching Initiator Node ACL in ASCII format 763 */ 764 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 765 continue; 766 767 kref_get(&deve_tmp->pr_kref); 768 spin_unlock(&lun_tmp->lun_deve_lock); 769 /* 770 * Grab a configfs group dependency that is released 771 * for the exception path at label out: below, or upon 772 * completion of adding ALL_TG_PT=1 registrations in 773 * __core_scsi3_add_registration() 774 */ 775 ret = core_scsi3_lunacl_depend_item(deve_tmp); 776 if (ret < 0) { 777 pr_err("core_scsi3_lunacl_depend" 778 "_item() failed\n"); 779 percpu_ref_put(&lun_tmp->lun_ref); 780 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 781 goto out; 782 } 783 /* 784 * Located a matching SCSI Initiator Port on a different 785 * port, allocate the pr_reg_atp and attach it to the 786 * pr_reg->pr_reg_atp_list that will be processed once 787 * the original *pr_reg is processed in 788 * __core_scsi3_add_registration() 789 */ 790 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 791 kref_read(&deve_tmp->pr_kref) != 0); 792 793 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 794 nacl_tmp, dest_lun, deve_tmp, 795 deve_tmp->mapped_lun, NULL, 796 sa_res_key, all_tg_pt, aptpl); 797 if (!pr_reg_atp) { 798 percpu_ref_put(&lun_tmp->lun_ref); 799 core_scsi3_lunacl_undepend_item(deve_tmp); 800 goto out; 801 } 802 803 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 804 &pr_reg->pr_reg_atp_list); 805 spin_lock(&lun_tmp->lun_deve_lock); 806 } 807 spin_unlock(&lun_tmp->lun_deve_lock); 808 809 spin_lock(&dev->se_port_lock); 810 percpu_ref_put(&lun_tmp->lun_ref); 811 } 812 spin_unlock(&dev->se_port_lock); 813 814 return pr_reg; 815 out: 816 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 817 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 818 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 819 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 820 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 821 } 822 kmem_cache_free(t10_pr_reg_cache, pr_reg); 823 return NULL; 824 } 825 826 int core_scsi3_alloc_aptpl_registration( 827 struct t10_reservation *pr_tmpl, 828 u64 sa_res_key, 829 unsigned char *i_port, 830 unsigned char *isid, 831 u64 mapped_lun, 832 unsigned char *t_port, 833 u16 tpgt, 834 u64 target_lun, 835 int res_holder, 836 int all_tg_pt, 837 u8 type) 838 { 839 struct t10_pr_registration *pr_reg; 840 841 if (!i_port || !t_port || !sa_res_key) { 842 pr_err("Illegal parameters for APTPL registration\n"); 843 return -EINVAL; 844 } 845 846 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 847 if (!pr_reg) { 848 pr_err("Unable to allocate struct t10_pr_registration\n"); 849 return -ENOMEM; 850 } 851 852 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 853 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 854 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 855 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 856 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 857 atomic_set(&pr_reg->pr_res_holders, 0); 858 pr_reg->pr_reg_nacl = NULL; 859 pr_reg->pr_reg_deve = NULL; 860 pr_reg->pr_res_mapped_lun = mapped_lun; 861 pr_reg->pr_aptpl_target_lun = target_lun; 862 pr_reg->pr_res_key = sa_res_key; 863 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 864 pr_reg->pr_reg_aptpl = 1; 865 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 866 pr_reg->pr_res_type = type; 867 /* 868 * If an ISID value had been saved in APTPL metadata for this 869 * SCSI Initiator Port, restore it now. 870 */ 871 if (isid != NULL) { 872 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 873 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 874 pr_reg->isid_present_at_reg = 1; 875 } 876 /* 877 * Copy the i_port and t_port information from caller. 878 */ 879 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 880 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 881 pr_reg->pr_reg_tpgt = tpgt; 882 /* 883 * Set pr_res_holder from caller, the pr_reg who is the reservation 884 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 885 * the Initiator Node LUN ACL from the fabric module is created for 886 * this registration. 887 */ 888 pr_reg->pr_res_holder = res_holder; 889 890 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 891 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 892 " metadata\n", (res_holder) ? "+reservation" : ""); 893 return 0; 894 } 895 896 static void core_scsi3_aptpl_reserve( 897 struct se_device *dev, 898 struct se_portal_group *tpg, 899 struct se_node_acl *node_acl, 900 struct t10_pr_registration *pr_reg) 901 { 902 char i_buf[PR_REG_ISID_ID_LEN]; 903 904 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 905 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 906 907 spin_lock(&dev->dev_reservation_lock); 908 dev->dev_pr_res_holder = pr_reg; 909 spin_unlock(&dev->dev_reservation_lock); 910 911 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 912 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 913 tpg->se_tpg_tfo->get_fabric_name(), 914 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 915 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 916 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 917 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 918 i_buf); 919 } 920 921 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 922 struct t10_pr_registration *, enum register_type, int); 923 924 static int __core_scsi3_check_aptpl_registration( 925 struct se_device *dev, 926 struct se_portal_group *tpg, 927 struct se_lun *lun, 928 u64 target_lun, 929 struct se_node_acl *nacl, 930 u64 mapped_lun) 931 { 932 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 933 struct t10_reservation *pr_tmpl = &dev->t10_pr; 934 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 935 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 936 u16 tpgt; 937 938 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 939 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 940 /* 941 * Copy Initiator Port information from struct se_node_acl 942 */ 943 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 944 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 945 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 946 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 947 /* 948 * Look for the matching registrations+reservation from those 949 * created from APTPL metadata. Note that multiple registrations 950 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 951 * TransportIDs. 952 */ 953 spin_lock(&pr_tmpl->aptpl_reg_lock); 954 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 955 pr_reg_aptpl_list) { 956 957 if (!strcmp(pr_reg->pr_iport, i_port) && 958 (pr_reg->pr_res_mapped_lun == mapped_lun) && 959 !(strcmp(pr_reg->pr_tport, t_port)) && 960 (pr_reg->pr_reg_tpgt == tpgt) && 961 (pr_reg->pr_aptpl_target_lun == target_lun)) { 962 /* 963 * Obtain the ->pr_reg_deve pointer + reference, that 964 * is released by __core_scsi3_add_registration() below. 965 */ 966 rcu_read_lock(); 967 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 968 if (!pr_reg->pr_reg_deve) { 969 pr_err("Unable to locate PR APTPL %s mapped_lun:" 970 " %llu\n", nacl->initiatorname, mapped_lun); 971 rcu_read_unlock(); 972 continue; 973 } 974 kref_get(&pr_reg->pr_reg_deve->pr_kref); 975 rcu_read_unlock(); 976 977 pr_reg->pr_reg_nacl = nacl; 978 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 979 list_del(&pr_reg->pr_reg_aptpl_list); 980 spin_unlock(&pr_tmpl->aptpl_reg_lock); 981 /* 982 * At this point all of the pointers in *pr_reg will 983 * be setup, so go ahead and add the registration. 984 */ 985 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 986 /* 987 * If this registration is the reservation holder, 988 * make that happen now.. 989 */ 990 if (pr_reg->pr_res_holder) 991 core_scsi3_aptpl_reserve(dev, tpg, 992 nacl, pr_reg); 993 /* 994 * Reenable pr_aptpl_active to accept new metadata 995 * updates once the SCSI device is active again.. 996 */ 997 spin_lock(&pr_tmpl->aptpl_reg_lock); 998 pr_tmpl->pr_aptpl_active = 1; 999 } 1000 } 1001 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1002 1003 return 0; 1004 } 1005 1006 int core_scsi3_check_aptpl_registration( 1007 struct se_device *dev, 1008 struct se_portal_group *tpg, 1009 struct se_lun *lun, 1010 struct se_node_acl *nacl, 1011 u64 mapped_lun) 1012 { 1013 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1014 return 0; 1015 1016 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1017 lun->unpacked_lun, nacl, 1018 mapped_lun); 1019 } 1020 1021 static void __core_scsi3_dump_registration( 1022 const struct target_core_fabric_ops *tfo, 1023 struct se_device *dev, 1024 struct se_node_acl *nacl, 1025 struct t10_pr_registration *pr_reg, 1026 enum register_type register_type) 1027 { 1028 struct se_portal_group *se_tpg = nacl->se_tpg; 1029 char i_buf[PR_REG_ISID_ID_LEN]; 1030 1031 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1032 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1033 1034 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1035 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1036 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1037 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1038 i_buf); 1039 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1040 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1041 tfo->tpg_get_tag(se_tpg)); 1042 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1043 " Port(s)\n", tfo->get_fabric_name(), 1044 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1045 dev->transport->name); 1046 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1047 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1048 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1049 pr_reg->pr_reg_aptpl); 1050 } 1051 1052 static void __core_scsi3_add_registration( 1053 struct se_device *dev, 1054 struct se_node_acl *nacl, 1055 struct t10_pr_registration *pr_reg, 1056 enum register_type register_type, 1057 int register_move) 1058 { 1059 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1060 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1061 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1062 struct se_dev_entry *deve; 1063 1064 /* 1065 * Increment PRgeneration counter for struct se_device upon a successful 1066 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1067 * 1068 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1069 * action, the struct se_device->dev_reservation_lock will already be held, 1070 * so we do not call core_scsi3_pr_generation() which grabs the lock 1071 * for the REGISTER. 1072 */ 1073 pr_reg->pr_res_generation = (register_move) ? 1074 dev->t10_pr.pr_generation++ : 1075 core_scsi3_pr_generation(dev); 1076 1077 spin_lock(&pr_tmpl->registration_lock); 1078 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1079 1080 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1081 spin_unlock(&pr_tmpl->registration_lock); 1082 /* 1083 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1084 */ 1085 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1086 goto out; 1087 /* 1088 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1089 * allocated in __core_scsi3_alloc_registration() 1090 */ 1091 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1092 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1093 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1094 1095 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1096 1097 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1098 1099 spin_lock(&pr_tmpl->registration_lock); 1100 list_add_tail(&pr_reg_tmp->pr_reg_list, 1101 &pr_tmpl->registration_list); 1102 1103 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1104 register_type); 1105 spin_unlock(&pr_tmpl->registration_lock); 1106 /* 1107 * Drop configfs group dependency reference and deve->pr_kref 1108 * obtained from __core_scsi3_alloc_registration() code. 1109 */ 1110 rcu_read_lock(); 1111 deve = pr_reg_tmp->pr_reg_deve; 1112 if (deve) { 1113 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1114 core_scsi3_lunacl_undepend_item(deve); 1115 pr_reg_tmp->pr_reg_deve = NULL; 1116 } 1117 rcu_read_unlock(); 1118 } 1119 out: 1120 /* 1121 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1122 */ 1123 rcu_read_lock(); 1124 deve = pr_reg->pr_reg_deve; 1125 if (deve) { 1126 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1127 kref_put(&deve->pr_kref, target_pr_kref_release); 1128 pr_reg->pr_reg_deve = NULL; 1129 } 1130 rcu_read_unlock(); 1131 } 1132 1133 static int core_scsi3_alloc_registration( 1134 struct se_device *dev, 1135 struct se_node_acl *nacl, 1136 struct se_lun *lun, 1137 struct se_dev_entry *deve, 1138 u64 mapped_lun, 1139 unsigned char *isid, 1140 u64 sa_res_key, 1141 int all_tg_pt, 1142 int aptpl, 1143 enum register_type register_type, 1144 int register_move) 1145 { 1146 struct t10_pr_registration *pr_reg; 1147 1148 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1149 isid, sa_res_key, all_tg_pt, 1150 aptpl); 1151 if (!pr_reg) 1152 return -EPERM; 1153 1154 __core_scsi3_add_registration(dev, nacl, pr_reg, 1155 register_type, register_move); 1156 return 0; 1157 } 1158 1159 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1160 struct se_device *dev, 1161 struct se_node_acl *nacl, 1162 unsigned char *isid) 1163 { 1164 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1165 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1166 struct se_portal_group *tpg; 1167 1168 spin_lock(&pr_tmpl->registration_lock); 1169 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1170 &pr_tmpl->registration_list, pr_reg_list) { 1171 /* 1172 * First look for a matching struct se_node_acl 1173 */ 1174 if (pr_reg->pr_reg_nacl != nacl) 1175 continue; 1176 1177 tpg = pr_reg->pr_reg_nacl->se_tpg; 1178 /* 1179 * If this registration does NOT contain a fabric provided 1180 * ISID, then we have found a match. 1181 */ 1182 if (!pr_reg->isid_present_at_reg) { 1183 /* 1184 * Determine if this SCSI device server requires that 1185 * SCSI Intiatior TransportID w/ ISIDs is enforced 1186 * for fabric modules (iSCSI) requiring them. 1187 */ 1188 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1189 if (dev->dev_attrib.enforce_pr_isids) 1190 continue; 1191 } 1192 atomic_inc_mb(&pr_reg->pr_res_holders); 1193 spin_unlock(&pr_tmpl->registration_lock); 1194 return pr_reg; 1195 } 1196 /* 1197 * If the *pr_reg contains a fabric defined ISID for multi-value 1198 * SCSI Initiator Port TransportIDs, then we expect a valid 1199 * matching ISID to be provided by the local SCSI Initiator Port. 1200 */ 1201 if (!isid) 1202 continue; 1203 if (strcmp(isid, pr_reg->pr_reg_isid)) 1204 continue; 1205 1206 atomic_inc_mb(&pr_reg->pr_res_holders); 1207 spin_unlock(&pr_tmpl->registration_lock); 1208 return pr_reg; 1209 } 1210 spin_unlock(&pr_tmpl->registration_lock); 1211 1212 return NULL; 1213 } 1214 1215 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1216 struct se_device *dev, 1217 struct se_node_acl *nacl, 1218 struct se_session *sess) 1219 { 1220 struct se_portal_group *tpg = nacl->se_tpg; 1221 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1222 1223 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1224 memset(&buf[0], 0, PR_REG_ISID_LEN); 1225 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1226 PR_REG_ISID_LEN); 1227 isid_ptr = &buf[0]; 1228 } 1229 1230 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1231 } 1232 1233 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1234 { 1235 atomic_dec_mb(&pr_reg->pr_res_holders); 1236 } 1237 1238 static int core_scsi3_check_implicit_release( 1239 struct se_device *dev, 1240 struct t10_pr_registration *pr_reg) 1241 { 1242 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1243 struct t10_pr_registration *pr_res_holder; 1244 int ret = 0; 1245 1246 spin_lock(&dev->dev_reservation_lock); 1247 pr_res_holder = dev->dev_pr_res_holder; 1248 if (!pr_res_holder) { 1249 spin_unlock(&dev->dev_reservation_lock); 1250 return ret; 1251 } 1252 if (pr_res_holder == pr_reg) { 1253 /* 1254 * Perform an implicit RELEASE if the registration that 1255 * is being released is holding the reservation. 1256 * 1257 * From spc4r17, section 5.7.11.1: 1258 * 1259 * e) If the I_T nexus is the persistent reservation holder 1260 * and the persistent reservation is not an all registrants 1261 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1262 * service action or REGISTER AND IGNORE EXISTING KEY 1263 * service action with the SERVICE ACTION RESERVATION KEY 1264 * field set to zero (see 5.7.11.3). 1265 */ 1266 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1267 ret = 1; 1268 /* 1269 * For 'All Registrants' reservation types, all existing 1270 * registrations are still processed as reservation holders 1271 * in core_scsi3_pr_seq_non_holder() after the initial 1272 * reservation holder is implicitly released here. 1273 */ 1274 } else if (pr_reg->pr_reg_all_tg_pt && 1275 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1276 pr_reg->pr_reg_nacl->initiatorname)) && 1277 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1278 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1279 " UNREGISTER while existing reservation with matching" 1280 " key 0x%016Lx is present from another SCSI Initiator" 1281 " Port\n", pr_reg->pr_res_key); 1282 ret = -EPERM; 1283 } 1284 spin_unlock(&dev->dev_reservation_lock); 1285 1286 return ret; 1287 } 1288 1289 /* 1290 * Called with struct t10_reservation->registration_lock held. 1291 */ 1292 static void __core_scsi3_free_registration( 1293 struct se_device *dev, 1294 struct t10_pr_registration *pr_reg, 1295 struct list_head *preempt_and_abort_list, 1296 int dec_holders) 1297 __releases(&pr_tmpl->registration_lock) 1298 __acquires(&pr_tmpl->registration_lock) 1299 { 1300 const struct target_core_fabric_ops *tfo = 1301 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1302 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1303 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1304 struct se_dev_entry *deve; 1305 char i_buf[PR_REG_ISID_ID_LEN]; 1306 1307 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1308 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1309 1310 if (!list_empty(&pr_reg->pr_reg_list)) 1311 list_del(&pr_reg->pr_reg_list); 1312 /* 1313 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1314 * so call core_scsi3_put_pr_reg() to decrement our reference. 1315 */ 1316 if (dec_holders) 1317 core_scsi3_put_pr_reg(pr_reg); 1318 1319 spin_unlock(&pr_tmpl->registration_lock); 1320 /* 1321 * Wait until all reference from any other I_T nexuses for this 1322 * *pr_reg have been released. Because list_del() is called above, 1323 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1324 * count back to zero, and we release *pr_reg. 1325 */ 1326 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1327 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1328 tfo->get_fabric_name()); 1329 cpu_relax(); 1330 } 1331 1332 rcu_read_lock(); 1333 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1334 if (deve) 1335 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1336 rcu_read_unlock(); 1337 1338 spin_lock(&pr_tmpl->registration_lock); 1339 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1340 " Node: %s%s\n", tfo->get_fabric_name(), 1341 pr_reg->pr_reg_nacl->initiatorname, 1342 i_buf); 1343 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1344 " Port(s)\n", tfo->get_fabric_name(), 1345 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1346 dev->transport->name); 1347 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1348 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1349 pr_reg->pr_res_generation); 1350 1351 if (!preempt_and_abort_list) { 1352 pr_reg->pr_reg_deve = NULL; 1353 pr_reg->pr_reg_nacl = NULL; 1354 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1355 return; 1356 } 1357 /* 1358 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1359 * are released once the ABORT_TASK_SET has completed.. 1360 */ 1361 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1362 } 1363 1364 void core_scsi3_free_pr_reg_from_nacl( 1365 struct se_device *dev, 1366 struct se_node_acl *nacl) 1367 { 1368 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1369 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1370 bool free_reg = false; 1371 /* 1372 * If the passed se_node_acl matches the reservation holder, 1373 * release the reservation. 1374 */ 1375 spin_lock(&dev->dev_reservation_lock); 1376 pr_res_holder = dev->dev_pr_res_holder; 1377 if ((pr_res_holder != NULL) && 1378 (pr_res_holder->pr_reg_nacl == nacl)) { 1379 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1380 free_reg = true; 1381 } 1382 spin_unlock(&dev->dev_reservation_lock); 1383 /* 1384 * Release any registration associated with the struct se_node_acl. 1385 */ 1386 spin_lock(&pr_tmpl->registration_lock); 1387 if (pr_res_holder && free_reg) 1388 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1389 1390 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1391 &pr_tmpl->registration_list, pr_reg_list) { 1392 1393 if (pr_reg->pr_reg_nacl != nacl) 1394 continue; 1395 1396 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1397 } 1398 spin_unlock(&pr_tmpl->registration_lock); 1399 } 1400 1401 void core_scsi3_free_all_registrations( 1402 struct se_device *dev) 1403 { 1404 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1405 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1406 1407 spin_lock(&dev->dev_reservation_lock); 1408 pr_res_holder = dev->dev_pr_res_holder; 1409 if (pr_res_holder != NULL) { 1410 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1411 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1412 pr_res_holder, 0, 0); 1413 } 1414 spin_unlock(&dev->dev_reservation_lock); 1415 1416 spin_lock(&pr_tmpl->registration_lock); 1417 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1418 &pr_tmpl->registration_list, pr_reg_list) { 1419 1420 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1421 } 1422 spin_unlock(&pr_tmpl->registration_lock); 1423 1424 spin_lock(&pr_tmpl->aptpl_reg_lock); 1425 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1426 pr_reg_aptpl_list) { 1427 list_del(&pr_reg->pr_reg_aptpl_list); 1428 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1429 } 1430 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1431 } 1432 1433 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1434 { 1435 return target_depend_item(&tpg->tpg_group.cg_item); 1436 } 1437 1438 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1439 { 1440 target_undepend_item(&tpg->tpg_group.cg_item); 1441 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1442 } 1443 1444 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1445 { 1446 if (nacl->dynamic_node_acl) 1447 return 0; 1448 return target_depend_item(&nacl->acl_group.cg_item); 1449 } 1450 1451 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1452 { 1453 if (!nacl->dynamic_node_acl) 1454 target_undepend_item(&nacl->acl_group.cg_item); 1455 atomic_dec_mb(&nacl->acl_pr_ref_count); 1456 } 1457 1458 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1459 { 1460 struct se_lun_acl *lun_acl; 1461 1462 /* 1463 * For nacl->dynamic_node_acl=1 1464 */ 1465 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1466 kref_read(&se_deve->pr_kref) != 0); 1467 if (!lun_acl) 1468 return 0; 1469 1470 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1471 } 1472 1473 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1474 { 1475 struct se_lun_acl *lun_acl; 1476 1477 /* 1478 * For nacl->dynamic_node_acl=1 1479 */ 1480 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1481 kref_read(&se_deve->pr_kref) != 0); 1482 if (!lun_acl) { 1483 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1484 return; 1485 } 1486 1487 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1488 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1489 } 1490 1491 static sense_reason_t 1492 core_scsi3_decode_spec_i_port( 1493 struct se_cmd *cmd, 1494 struct se_portal_group *tpg, 1495 unsigned char *l_isid, 1496 u64 sa_res_key, 1497 int all_tg_pt, 1498 int aptpl) 1499 { 1500 struct se_device *dev = cmd->se_dev; 1501 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1502 struct se_session *se_sess = cmd->se_sess; 1503 struct se_node_acl *dest_node_acl = NULL; 1504 struct se_dev_entry *dest_se_deve = NULL; 1505 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1506 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1507 LIST_HEAD(tid_dest_list); 1508 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1509 unsigned char *buf, *ptr, proto_ident; 1510 const unsigned char *i_str = NULL; 1511 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1512 sense_reason_t ret; 1513 u32 tpdl, tid_len = 0; 1514 u32 dest_rtpi = 0; 1515 1516 /* 1517 * Allocate a struct pr_transport_id_holder and setup the 1518 * local_node_acl pointer and add to struct list_head tid_dest_list 1519 * for add registration processing in the loop of tid_dest_list below. 1520 */ 1521 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1522 if (!tidh_new) { 1523 pr_err("Unable to allocate tidh_new\n"); 1524 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1525 } 1526 INIT_LIST_HEAD(&tidh_new->dest_list); 1527 tidh_new->dest_tpg = tpg; 1528 tidh_new->dest_node_acl = se_sess->se_node_acl; 1529 1530 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1531 se_sess->se_node_acl, cmd->se_lun, 1532 NULL, cmd->orig_fe_lun, l_isid, 1533 sa_res_key, all_tg_pt, aptpl); 1534 if (!local_pr_reg) { 1535 kfree(tidh_new); 1536 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1537 } 1538 tidh_new->dest_pr_reg = local_pr_reg; 1539 /* 1540 * The local I_T nexus does not hold any configfs dependances, 1541 * so we set tidh_new->dest_se_deve to NULL to prevent the 1542 * configfs_undepend_item() calls in the tid_dest_list loops below. 1543 */ 1544 tidh_new->dest_se_deve = NULL; 1545 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1546 1547 if (cmd->data_length < 28) { 1548 pr_warn("SPC-PR: Received PR OUT parameter list" 1549 " length too small: %u\n", cmd->data_length); 1550 ret = TCM_INVALID_PARAMETER_LIST; 1551 goto out; 1552 } 1553 1554 buf = transport_kmap_data_sg(cmd); 1555 if (!buf) { 1556 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1557 goto out; 1558 } 1559 1560 /* 1561 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1562 * first extract TransportID Parameter Data Length, and make sure 1563 * the value matches up to the SCSI expected data transfer length. 1564 */ 1565 tpdl = get_unaligned_be32(&buf[24]); 1566 1567 if ((tpdl + 28) != cmd->data_length) { 1568 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1569 " does not equal CDB data_length: %u\n", tpdl, 1570 cmd->data_length); 1571 ret = TCM_INVALID_PARAMETER_LIST; 1572 goto out_unmap; 1573 } 1574 /* 1575 * Start processing the received transport IDs using the 1576 * receiving I_T Nexus portal's fabric dependent methods to 1577 * obtain the SCSI Initiator Port/Device Identifiers. 1578 */ 1579 ptr = &buf[28]; 1580 1581 while (tpdl > 0) { 1582 struct se_lun *dest_lun, *tmp_lun; 1583 1584 proto_ident = (ptr[0] & 0x0f); 1585 dest_tpg = NULL; 1586 1587 spin_lock(&dev->se_port_lock); 1588 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1589 tmp_tpg = tmp_lun->lun_tpg; 1590 1591 /* 1592 * Look for the matching proto_ident provided by 1593 * the received TransportID 1594 */ 1595 if (tmp_tpg->proto_id != proto_ident) 1596 continue; 1597 dest_rtpi = tmp_lun->lun_rtpi; 1598 1599 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1600 (const char *)ptr, &tid_len, &iport_ptr); 1601 if (!i_str) 1602 continue; 1603 1604 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1605 spin_unlock(&dev->se_port_lock); 1606 1607 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1608 pr_err(" core_scsi3_tpg_depend_item()" 1609 " for tmp_tpg\n"); 1610 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1611 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1612 goto out_unmap; 1613 } 1614 /* 1615 * Locate the destination initiator ACL to be registered 1616 * from the decoded fabric module specific TransportID 1617 * at *i_str. 1618 */ 1619 mutex_lock(&tmp_tpg->acl_node_mutex); 1620 dest_node_acl = __core_tpg_get_initiator_node_acl( 1621 tmp_tpg, i_str); 1622 if (dest_node_acl) 1623 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1624 mutex_unlock(&tmp_tpg->acl_node_mutex); 1625 1626 if (!dest_node_acl) { 1627 core_scsi3_tpg_undepend_item(tmp_tpg); 1628 spin_lock(&dev->se_port_lock); 1629 continue; 1630 } 1631 1632 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1633 pr_err("configfs_depend_item() failed" 1634 " for dest_node_acl->acl_group\n"); 1635 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1636 core_scsi3_tpg_undepend_item(tmp_tpg); 1637 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1638 goto out_unmap; 1639 } 1640 1641 dest_tpg = tmp_tpg; 1642 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1643 " %s Port RTPI: %hu\n", 1644 dest_tpg->se_tpg_tfo->get_fabric_name(), 1645 dest_node_acl->initiatorname, dest_rtpi); 1646 1647 spin_lock(&dev->se_port_lock); 1648 break; 1649 } 1650 spin_unlock(&dev->se_port_lock); 1651 1652 if (!dest_tpg) { 1653 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1654 " dest_tpg\n"); 1655 ret = TCM_INVALID_PARAMETER_LIST; 1656 goto out_unmap; 1657 } 1658 1659 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1660 " tid_len: %d for %s + %s\n", 1661 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1662 tpdl, tid_len, i_str, iport_ptr); 1663 1664 if (tid_len > tpdl) { 1665 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1666 " %u for Transport ID: %s\n", tid_len, ptr); 1667 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1668 core_scsi3_tpg_undepend_item(dest_tpg); 1669 ret = TCM_INVALID_PARAMETER_LIST; 1670 goto out_unmap; 1671 } 1672 /* 1673 * Locate the desintation struct se_dev_entry pointer for matching 1674 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1675 * Target Port. 1676 */ 1677 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1678 dest_rtpi); 1679 if (!dest_se_deve) { 1680 pr_err("Unable to locate %s dest_se_deve" 1681 " from destination RTPI: %hu\n", 1682 dest_tpg->se_tpg_tfo->get_fabric_name(), 1683 dest_rtpi); 1684 1685 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1686 core_scsi3_tpg_undepend_item(dest_tpg); 1687 ret = TCM_INVALID_PARAMETER_LIST; 1688 goto out_unmap; 1689 } 1690 1691 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1692 pr_err("core_scsi3_lunacl_depend_item()" 1693 " failed\n"); 1694 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1695 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1696 core_scsi3_tpg_undepend_item(dest_tpg); 1697 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1698 goto out_unmap; 1699 } 1700 1701 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1702 " dest_se_deve mapped_lun: %llu\n", 1703 dest_tpg->se_tpg_tfo->get_fabric_name(), 1704 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1705 1706 /* 1707 * Skip any TransportIDs that already have a registration for 1708 * this target port. 1709 */ 1710 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1711 iport_ptr); 1712 if (pr_reg_e) { 1713 core_scsi3_put_pr_reg(pr_reg_e); 1714 core_scsi3_lunacl_undepend_item(dest_se_deve); 1715 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1716 core_scsi3_tpg_undepend_item(dest_tpg); 1717 ptr += tid_len; 1718 tpdl -= tid_len; 1719 tid_len = 0; 1720 continue; 1721 } 1722 /* 1723 * Allocate a struct pr_transport_id_holder and setup 1724 * the dest_node_acl and dest_se_deve pointers for the 1725 * loop below. 1726 */ 1727 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1728 GFP_KERNEL); 1729 if (!tidh_new) { 1730 pr_err("Unable to allocate tidh_new\n"); 1731 core_scsi3_lunacl_undepend_item(dest_se_deve); 1732 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1733 core_scsi3_tpg_undepend_item(dest_tpg); 1734 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1735 goto out_unmap; 1736 } 1737 INIT_LIST_HEAD(&tidh_new->dest_list); 1738 tidh_new->dest_tpg = dest_tpg; 1739 tidh_new->dest_node_acl = dest_node_acl; 1740 tidh_new->dest_se_deve = dest_se_deve; 1741 1742 /* 1743 * Allocate, but do NOT add the registration for the 1744 * TransportID referenced SCSI Initiator port. This 1745 * done because of the following from spc4r17 in section 1746 * 6.14.3 wrt SPEC_I_PT: 1747 * 1748 * "If a registration fails for any initiator port (e.g., if th 1749 * logical unit does not have enough resources available to 1750 * hold the registration information), no registrations shall be 1751 * made, and the command shall be terminated with 1752 * CHECK CONDITION status." 1753 * 1754 * That means we call __core_scsi3_alloc_registration() here, 1755 * and then call __core_scsi3_add_registration() in the 1756 * 2nd loop which will never fail. 1757 */ 1758 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1759 kref_read(&dest_se_deve->pr_kref) != 0); 1760 1761 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1762 dest_node_acl, dest_lun, dest_se_deve, 1763 dest_se_deve->mapped_lun, iport_ptr, 1764 sa_res_key, all_tg_pt, aptpl); 1765 if (!dest_pr_reg) { 1766 core_scsi3_lunacl_undepend_item(dest_se_deve); 1767 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1768 core_scsi3_tpg_undepend_item(dest_tpg); 1769 kfree(tidh_new); 1770 ret = TCM_INVALID_PARAMETER_LIST; 1771 goto out_unmap; 1772 } 1773 tidh_new->dest_pr_reg = dest_pr_reg; 1774 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1775 1776 ptr += tid_len; 1777 tpdl -= tid_len; 1778 tid_len = 0; 1779 1780 } 1781 1782 transport_kunmap_data_sg(cmd); 1783 1784 /* 1785 * Go ahead and create a registrations from tid_dest_list for the 1786 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1787 * and dest_se_deve. 1788 * 1789 * The SA Reservation Key from the PROUT is set for the 1790 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1791 * means that the TransportID Initiator port will be 1792 * registered on all of the target ports in the SCSI target device 1793 * ALL_TG_PT=0 means the registration will only be for the 1794 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1795 * was received. 1796 */ 1797 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1798 dest_tpg = tidh->dest_tpg; 1799 dest_node_acl = tidh->dest_node_acl; 1800 dest_se_deve = tidh->dest_se_deve; 1801 dest_pr_reg = tidh->dest_pr_reg; 1802 1803 list_del(&tidh->dest_list); 1804 kfree(tidh); 1805 1806 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1807 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1808 1809 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1810 dest_pr_reg, 0, 0); 1811 1812 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1813 " registered Transport ID for Node: %s%s Mapped LUN:" 1814 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1815 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1816 dest_se_deve->mapped_lun : 0); 1817 1818 if (!dest_se_deve) { 1819 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1820 target_pr_kref_release); 1821 continue; 1822 } 1823 core_scsi3_lunacl_undepend_item(dest_se_deve); 1824 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1825 core_scsi3_tpg_undepend_item(dest_tpg); 1826 } 1827 1828 return 0; 1829 out_unmap: 1830 transport_kunmap_data_sg(cmd); 1831 out: 1832 /* 1833 * For the failure case, release everything from tid_dest_list 1834 * including *dest_pr_reg and the configfs dependances.. 1835 */ 1836 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1837 dest_tpg = tidh->dest_tpg; 1838 dest_node_acl = tidh->dest_node_acl; 1839 dest_se_deve = tidh->dest_se_deve; 1840 dest_pr_reg = tidh->dest_pr_reg; 1841 1842 list_del(&tidh->dest_list); 1843 kfree(tidh); 1844 /* 1845 * Release any extra ALL_TG_PT=1 registrations for 1846 * the SPEC_I_PT=1 case. 1847 */ 1848 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1849 &dest_pr_reg->pr_reg_atp_list, 1850 pr_reg_atp_mem_list) { 1851 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1852 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1853 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1854 } 1855 1856 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1857 1858 if (!dest_se_deve) { 1859 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1860 target_pr_kref_release); 1861 continue; 1862 } 1863 core_scsi3_lunacl_undepend_item(dest_se_deve); 1864 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1865 core_scsi3_tpg_undepend_item(dest_tpg); 1866 } 1867 return ret; 1868 } 1869 1870 static int core_scsi3_update_aptpl_buf( 1871 struct se_device *dev, 1872 unsigned char *buf, 1873 u32 pr_aptpl_buf_len) 1874 { 1875 struct se_portal_group *tpg; 1876 struct t10_pr_registration *pr_reg; 1877 unsigned char tmp[512], isid_buf[32]; 1878 ssize_t len = 0; 1879 int reg_count = 0; 1880 int ret = 0; 1881 1882 spin_lock(&dev->dev_reservation_lock); 1883 spin_lock(&dev->t10_pr.registration_lock); 1884 /* 1885 * Walk the registration list.. 1886 */ 1887 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1888 pr_reg_list) { 1889 1890 tmp[0] = '\0'; 1891 isid_buf[0] = '\0'; 1892 tpg = pr_reg->pr_reg_nacl->se_tpg; 1893 /* 1894 * Write out any ISID value to APTPL metadata that was included 1895 * in the original registration. 1896 */ 1897 if (pr_reg->isid_present_at_reg) 1898 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1899 pr_reg->pr_reg_isid); 1900 /* 1901 * Include special metadata if the pr_reg matches the 1902 * reservation holder. 1903 */ 1904 if (dev->dev_pr_res_holder == pr_reg) { 1905 snprintf(tmp, 512, "PR_REG_START: %d" 1906 "\ninitiator_fabric=%s\n" 1907 "initiator_node=%s\n%s" 1908 "sa_res_key=%llu\n" 1909 "res_holder=1\nres_type=%02x\n" 1910 "res_scope=%02x\nres_all_tg_pt=%d\n" 1911 "mapped_lun=%llu\n", reg_count, 1912 tpg->se_tpg_tfo->get_fabric_name(), 1913 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1914 pr_reg->pr_res_key, pr_reg->pr_res_type, 1915 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1916 pr_reg->pr_res_mapped_lun); 1917 } else { 1918 snprintf(tmp, 512, "PR_REG_START: %d\n" 1919 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1920 "sa_res_key=%llu\nres_holder=0\n" 1921 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1922 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1923 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1924 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1925 pr_reg->pr_res_mapped_lun); 1926 } 1927 1928 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1929 pr_err("Unable to update renaming APTPL metadata," 1930 " reallocating larger buffer\n"); 1931 ret = -EMSGSIZE; 1932 goto out; 1933 } 1934 len += sprintf(buf+len, "%s", tmp); 1935 1936 /* 1937 * Include information about the associated SCSI target port. 1938 */ 1939 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1940 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1941 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1942 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1943 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1944 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1945 reg_count); 1946 1947 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1948 pr_err("Unable to update renaming APTPL metadata," 1949 " reallocating larger buffer\n"); 1950 ret = -EMSGSIZE; 1951 goto out; 1952 } 1953 len += sprintf(buf+len, "%s", tmp); 1954 reg_count++; 1955 } 1956 1957 if (!reg_count) 1958 len += sprintf(buf+len, "No Registrations or Reservations"); 1959 1960 out: 1961 spin_unlock(&dev->t10_pr.registration_lock); 1962 spin_unlock(&dev->dev_reservation_lock); 1963 1964 return ret; 1965 } 1966 1967 static int __core_scsi3_write_aptpl_to_file( 1968 struct se_device *dev, 1969 unsigned char *buf) 1970 { 1971 struct t10_wwn *wwn = &dev->t10_wwn; 1972 struct file *file; 1973 int flags = O_RDWR | O_CREAT | O_TRUNC; 1974 char path[512]; 1975 u32 pr_aptpl_buf_len; 1976 int ret; 1977 1978 memset(path, 0, 512); 1979 1980 if (strlen(&wwn->unit_serial[0]) >= 512) { 1981 pr_err("WWN value for struct se_device does not fit" 1982 " into path buffer\n"); 1983 return -EMSGSIZE; 1984 } 1985 1986 snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); 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 return PTR_ERR(file); 1992 } 1993 1994 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1995 1996 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1997 1998 if (ret < 0) 1999 pr_debug("Error writing APTPL metadata file: %s\n", path); 2000 fput(file); 2001 2002 return (ret < 0) ? -EIO : 0; 2003 } 2004 2005 /* 2006 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2007 * write out the updated metadata to struct file for this SCSI device. 2008 */ 2009 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2010 { 2011 unsigned char *buf; 2012 int rc, len = PR_APTPL_BUF_LEN; 2013 2014 if (!aptpl) { 2015 char *null_buf = "No Registrations or Reservations\n"; 2016 2017 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2018 dev->t10_pr.pr_aptpl_active = 0; 2019 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2020 2021 if (rc) 2022 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2023 2024 return 0; 2025 } 2026 retry: 2027 buf = vzalloc(len); 2028 if (!buf) 2029 return TCM_OUT_OF_RESOURCES; 2030 2031 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2032 if (rc < 0) { 2033 vfree(buf); 2034 len *= 2; 2035 goto retry; 2036 } 2037 2038 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2039 if (rc != 0) { 2040 pr_err("SPC-3 PR: Could not update APTPL\n"); 2041 vfree(buf); 2042 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2043 } 2044 dev->t10_pr.pr_aptpl_active = 1; 2045 vfree(buf); 2046 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2047 return 0; 2048 } 2049 2050 static sense_reason_t 2051 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2052 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2053 { 2054 struct se_session *se_sess = cmd->se_sess; 2055 struct se_device *dev = cmd->se_dev; 2056 struct se_lun *se_lun = cmd->se_lun; 2057 struct se_portal_group *se_tpg; 2058 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2059 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2060 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2061 sense_reason_t ret = TCM_NO_SENSE; 2062 int pr_holder = 0, type; 2063 2064 if (!se_sess || !se_lun) { 2065 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2066 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2067 } 2068 se_tpg = se_sess->se_tpg; 2069 2070 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2071 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2072 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2073 PR_REG_ISID_LEN); 2074 isid_ptr = &isid_buf[0]; 2075 } 2076 /* 2077 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2078 */ 2079 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2080 if (!pr_reg) { 2081 if (res_key) { 2082 pr_warn("SPC-3 PR: Reservation Key non-zero" 2083 " for SA REGISTER, returning CONFLICT\n"); 2084 return TCM_RESERVATION_CONFLICT; 2085 } 2086 /* 2087 * Do nothing but return GOOD status. 2088 */ 2089 if (!sa_res_key) 2090 return 0; 2091 2092 if (!spec_i_pt) { 2093 /* 2094 * Perform the Service Action REGISTER on the Initiator 2095 * Port Endpoint that the PRO was received from on the 2096 * Logical Unit of the SCSI device server. 2097 */ 2098 if (core_scsi3_alloc_registration(cmd->se_dev, 2099 se_sess->se_node_acl, cmd->se_lun, 2100 NULL, cmd->orig_fe_lun, isid_ptr, 2101 sa_res_key, all_tg_pt, aptpl, 2102 register_type, 0)) { 2103 pr_err("Unable to allocate" 2104 " struct t10_pr_registration\n"); 2105 return TCM_INVALID_PARAMETER_LIST; 2106 } 2107 } else { 2108 /* 2109 * Register both the Initiator port that received 2110 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2111 * TransportID from Parameter list and loop through 2112 * fabric dependent parameter list while calling 2113 * logic from of core_scsi3_alloc_registration() for 2114 * each TransportID provided SCSI Initiator Port/Device 2115 */ 2116 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2117 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2118 if (ret != 0) 2119 return ret; 2120 } 2121 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2122 } 2123 2124 /* ok, existing registration */ 2125 2126 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2127 pr_err("SPC-3 PR REGISTER: Received" 2128 " res_key: 0x%016Lx does not match" 2129 " existing SA REGISTER res_key:" 2130 " 0x%016Lx\n", res_key, 2131 pr_reg->pr_res_key); 2132 ret = TCM_RESERVATION_CONFLICT; 2133 goto out; 2134 } 2135 2136 if (spec_i_pt) { 2137 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2138 " set on a registered nexus\n"); 2139 ret = TCM_INVALID_PARAMETER_LIST; 2140 goto out; 2141 } 2142 2143 /* 2144 * An existing ALL_TG_PT=1 registration being released 2145 * must also set ALL_TG_PT=1 in the incoming PROUT. 2146 */ 2147 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2148 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2149 " registration exists, but ALL_TG_PT=1 bit not" 2150 " present in received PROUT\n"); 2151 ret = TCM_INVALID_CDB_FIELD; 2152 goto out; 2153 } 2154 2155 /* 2156 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2157 */ 2158 if (sa_res_key) { 2159 /* 2160 * Increment PRgeneration counter for struct se_device" 2161 * upon a successful REGISTER, see spc4r17 section 6.3.2 2162 * READ_KEYS service action. 2163 */ 2164 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2165 pr_reg->pr_res_key = sa_res_key; 2166 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2167 " Key for %s to: 0x%016Lx PRgeneration:" 2168 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2169 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2170 pr_reg->pr_reg_nacl->initiatorname, 2171 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2172 2173 } else { 2174 /* 2175 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2176 */ 2177 type = pr_reg->pr_res_type; 2178 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2179 pr_reg); 2180 if (pr_holder < 0) { 2181 ret = TCM_RESERVATION_CONFLICT; 2182 goto out; 2183 } 2184 2185 spin_lock(&pr_tmpl->registration_lock); 2186 /* 2187 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2188 * and matching pr_res_key. 2189 */ 2190 if (pr_reg->pr_reg_all_tg_pt) { 2191 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2192 &pr_tmpl->registration_list, 2193 pr_reg_list) { 2194 2195 if (!pr_reg_p->pr_reg_all_tg_pt) 2196 continue; 2197 if (pr_reg_p->pr_res_key != res_key) 2198 continue; 2199 if (pr_reg == pr_reg_p) 2200 continue; 2201 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2202 pr_reg_p->pr_reg_nacl->initiatorname)) 2203 continue; 2204 2205 __core_scsi3_free_registration(dev, 2206 pr_reg_p, NULL, 0); 2207 } 2208 } 2209 2210 /* 2211 * Release the calling I_T Nexus registration now.. 2212 */ 2213 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2214 pr_reg = NULL; 2215 2216 /* 2217 * From spc4r17, section 5.7.11.3 Unregistering 2218 * 2219 * If the persistent reservation is a registrants only 2220 * type, the device server shall establish a unit 2221 * attention condition for the initiator port associated 2222 * with every registered I_T nexus except for the I_T 2223 * nexus on which the PERSISTENT RESERVE OUT command was 2224 * received, with the additional sense code set to 2225 * RESERVATIONS RELEASED. 2226 */ 2227 if (pr_holder && 2228 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2229 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2230 list_for_each_entry(pr_reg_p, 2231 &pr_tmpl->registration_list, 2232 pr_reg_list) { 2233 2234 target_ua_allocate_lun( 2235 pr_reg_p->pr_reg_nacl, 2236 pr_reg_p->pr_res_mapped_lun, 2237 0x2A, 2238 ASCQ_2AH_RESERVATIONS_RELEASED); 2239 } 2240 } 2241 2242 spin_unlock(&pr_tmpl->registration_lock); 2243 } 2244 2245 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2246 2247 out: 2248 if (pr_reg) 2249 core_scsi3_put_pr_reg(pr_reg); 2250 return ret; 2251 } 2252 2253 unsigned char *core_scsi3_pr_dump_type(int type) 2254 { 2255 switch (type) { 2256 case PR_TYPE_WRITE_EXCLUSIVE: 2257 return "Write Exclusive Access"; 2258 case PR_TYPE_EXCLUSIVE_ACCESS: 2259 return "Exclusive Access"; 2260 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2261 return "Write Exclusive Access, Registrants Only"; 2262 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2263 return "Exclusive Access, Registrants Only"; 2264 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2265 return "Write Exclusive Access, All Registrants"; 2266 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2267 return "Exclusive Access, All Registrants"; 2268 default: 2269 break; 2270 } 2271 2272 return "Unknown SPC-3 PR Type"; 2273 } 2274 2275 static sense_reason_t 2276 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2277 { 2278 struct se_device *dev = cmd->se_dev; 2279 struct se_session *se_sess = cmd->se_sess; 2280 struct se_lun *se_lun = cmd->se_lun; 2281 struct t10_pr_registration *pr_reg, *pr_res_holder; 2282 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2283 char i_buf[PR_REG_ISID_ID_LEN]; 2284 sense_reason_t ret; 2285 2286 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2287 2288 if (!se_sess || !se_lun) { 2289 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2290 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2291 } 2292 /* 2293 * Locate the existing *pr_reg via struct se_node_acl pointers 2294 */ 2295 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2296 se_sess); 2297 if (!pr_reg) { 2298 pr_err("SPC-3 PR: Unable to locate" 2299 " PR_REGISTERED *pr_reg for RESERVE\n"); 2300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2301 } 2302 /* 2303 * From spc4r17 Section 5.7.9: Reserving: 2304 * 2305 * An application client creates a persistent reservation by issuing 2306 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2307 * a registered I_T nexus with the following parameters: 2308 * a) RESERVATION KEY set to the value of the reservation key that is 2309 * registered with the logical unit for the I_T nexus; and 2310 */ 2311 if (res_key != pr_reg->pr_res_key) { 2312 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2313 " does not match existing SA REGISTER res_key:" 2314 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2315 ret = TCM_RESERVATION_CONFLICT; 2316 goto out_put_pr_reg; 2317 } 2318 /* 2319 * From spc4r17 Section 5.7.9: Reserving: 2320 * 2321 * From above: 2322 * b) TYPE field and SCOPE field set to the persistent reservation 2323 * being created. 2324 * 2325 * Only one persistent reservation is allowed at a time per logical unit 2326 * and that persistent reservation has a scope of LU_SCOPE. 2327 */ 2328 if (scope != PR_SCOPE_LU_SCOPE) { 2329 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2330 ret = TCM_INVALID_PARAMETER_LIST; 2331 goto out_put_pr_reg; 2332 } 2333 /* 2334 * See if we have an existing PR reservation holder pointer at 2335 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2336 * *pr_res_holder. 2337 */ 2338 spin_lock(&dev->dev_reservation_lock); 2339 pr_res_holder = dev->dev_pr_res_holder; 2340 if (pr_res_holder) { 2341 /* 2342 * From spc4r17 Section 5.7.9: Reserving: 2343 * 2344 * If the device server receives a PERSISTENT RESERVE OUT 2345 * command from an I_T nexus other than a persistent reservation 2346 * holder (see 5.7.10) that attempts to create a persistent 2347 * reservation when a persistent reservation already exists for 2348 * the logical unit, then the command shall be completed with 2349 * RESERVATION CONFLICT status. 2350 */ 2351 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2352 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2353 pr_err("SPC-3 PR: Attempted RESERVE from" 2354 " [%s]: %s while reservation already held by" 2355 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2356 cmd->se_tfo->get_fabric_name(), 2357 se_sess->se_node_acl->initiatorname, 2358 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2359 pr_res_holder->pr_reg_nacl->initiatorname); 2360 2361 spin_unlock(&dev->dev_reservation_lock); 2362 ret = TCM_RESERVATION_CONFLICT; 2363 goto out_put_pr_reg; 2364 } 2365 /* 2366 * From spc4r17 Section 5.7.9: Reserving: 2367 * 2368 * If a persistent reservation holder attempts to modify the 2369 * type or scope of an existing persistent reservation, the 2370 * command shall be completed with RESERVATION CONFLICT status. 2371 */ 2372 if ((pr_res_holder->pr_res_type != type) || 2373 (pr_res_holder->pr_res_scope != scope)) { 2374 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2375 pr_err("SPC-3 PR: Attempted RESERVE from" 2376 " [%s]: %s trying to change TYPE and/or SCOPE," 2377 " while reservation already held by [%s]: %s," 2378 " returning RESERVATION_CONFLICT\n", 2379 cmd->se_tfo->get_fabric_name(), 2380 se_sess->se_node_acl->initiatorname, 2381 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2382 pr_res_holder->pr_reg_nacl->initiatorname); 2383 2384 spin_unlock(&dev->dev_reservation_lock); 2385 ret = TCM_RESERVATION_CONFLICT; 2386 goto out_put_pr_reg; 2387 } 2388 /* 2389 * From spc4r17 Section 5.7.9: Reserving: 2390 * 2391 * If the device server receives a PERSISTENT RESERVE OUT 2392 * command with RESERVE service action where the TYPE field and 2393 * the SCOPE field contain the same values as the existing type 2394 * and scope from a persistent reservation holder, it shall not 2395 * make any change to the existing persistent reservation and 2396 * shall completethe command with GOOD status. 2397 */ 2398 spin_unlock(&dev->dev_reservation_lock); 2399 ret = 0; 2400 goto out_put_pr_reg; 2401 } 2402 /* 2403 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2404 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2405 */ 2406 pr_reg->pr_res_scope = scope; 2407 pr_reg->pr_res_type = type; 2408 pr_reg->pr_res_holder = 1; 2409 dev->dev_pr_res_holder = pr_reg; 2410 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2411 2412 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2413 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2414 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2415 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2416 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2417 cmd->se_tfo->get_fabric_name(), 2418 se_sess->se_node_acl->initiatorname, 2419 i_buf); 2420 spin_unlock(&dev->dev_reservation_lock); 2421 2422 if (pr_tmpl->pr_aptpl_active) 2423 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2424 2425 ret = 0; 2426 out_put_pr_reg: 2427 core_scsi3_put_pr_reg(pr_reg); 2428 return ret; 2429 } 2430 2431 static sense_reason_t 2432 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2433 u64 res_key) 2434 { 2435 switch (type) { 2436 case PR_TYPE_WRITE_EXCLUSIVE: 2437 case PR_TYPE_EXCLUSIVE_ACCESS: 2438 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2439 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2440 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2441 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2442 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2443 default: 2444 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2445 " 0x%02x\n", type); 2446 return TCM_INVALID_CDB_FIELD; 2447 } 2448 } 2449 2450 /* 2451 * Called with struct se_device->dev_reservation_lock held. 2452 */ 2453 static void __core_scsi3_complete_pro_release( 2454 struct se_device *dev, 2455 struct se_node_acl *se_nacl, 2456 struct t10_pr_registration *pr_reg, 2457 int explicit, 2458 int unreg) 2459 { 2460 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2461 char i_buf[PR_REG_ISID_ID_LEN]; 2462 int pr_res_type = 0, pr_res_scope = 0; 2463 2464 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2465 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2466 /* 2467 * Go ahead and release the current PR reservation holder. 2468 * If an All Registrants reservation is currently active and 2469 * a unregister operation is requested, replace the current 2470 * dev_pr_res_holder with another active registration. 2471 */ 2472 if (dev->dev_pr_res_holder) { 2473 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2474 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2475 dev->dev_pr_res_holder->pr_res_type = 0; 2476 dev->dev_pr_res_holder->pr_res_scope = 0; 2477 dev->dev_pr_res_holder->pr_res_holder = 0; 2478 dev->dev_pr_res_holder = NULL; 2479 } 2480 if (!unreg) 2481 goto out; 2482 2483 spin_lock(&dev->t10_pr.registration_lock); 2484 list_del_init(&pr_reg->pr_reg_list); 2485 /* 2486 * If the I_T nexus is a reservation holder, the persistent reservation 2487 * is of an all registrants type, and the I_T nexus is the last remaining 2488 * registered I_T nexus, then the device server shall also release the 2489 * persistent reservation. 2490 */ 2491 if (!list_empty(&dev->t10_pr.registration_list) && 2492 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2493 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2494 dev->dev_pr_res_holder = 2495 list_entry(dev->t10_pr.registration_list.next, 2496 struct t10_pr_registration, pr_reg_list); 2497 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2498 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2499 dev->dev_pr_res_holder->pr_res_holder = 1; 2500 } 2501 spin_unlock(&dev->t10_pr.registration_lock); 2502 out: 2503 if (!dev->dev_pr_res_holder) { 2504 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2505 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2506 tfo->get_fabric_name(), (explicit) ? "explicit" : 2507 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2508 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2509 } 2510 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2511 tfo->get_fabric_name(), se_nacl->initiatorname, 2512 i_buf); 2513 /* 2514 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2515 */ 2516 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2517 } 2518 2519 static sense_reason_t 2520 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2521 u64 res_key) 2522 { 2523 struct se_device *dev = cmd->se_dev; 2524 struct se_session *se_sess = cmd->se_sess; 2525 struct se_lun *se_lun = cmd->se_lun; 2526 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2527 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2528 sense_reason_t ret = 0; 2529 2530 if (!se_sess || !se_lun) { 2531 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2532 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2533 } 2534 /* 2535 * Locate the existing *pr_reg via struct se_node_acl pointers 2536 */ 2537 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2538 if (!pr_reg) { 2539 pr_err("SPC-3 PR: Unable to locate" 2540 " PR_REGISTERED *pr_reg for RELEASE\n"); 2541 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2542 } 2543 /* 2544 * From spc4r17 Section 5.7.11.2 Releasing: 2545 * 2546 * If there is no persistent reservation or in response to a persistent 2547 * reservation release request from a registered I_T nexus that is not a 2548 * persistent reservation holder (see 5.7.10), the device server shall 2549 * do the following: 2550 * 2551 * a) Not release the persistent reservation, if any; 2552 * b) Not remove any registrations; and 2553 * c) Complete the command with GOOD status. 2554 */ 2555 spin_lock(&dev->dev_reservation_lock); 2556 pr_res_holder = dev->dev_pr_res_holder; 2557 if (!pr_res_holder) { 2558 /* 2559 * No persistent reservation, return GOOD status. 2560 */ 2561 spin_unlock(&dev->dev_reservation_lock); 2562 goto out_put_pr_reg; 2563 } 2564 2565 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2566 /* 2567 * Release request from a registered I_T nexus that is not a 2568 * persistent reservation holder. return GOOD status. 2569 */ 2570 spin_unlock(&dev->dev_reservation_lock); 2571 goto out_put_pr_reg; 2572 } 2573 2574 /* 2575 * From spc4r17 Section 5.7.11.2 Releasing: 2576 * 2577 * Only the persistent reservation holder (see 5.7.10) is allowed to 2578 * release a persistent reservation. 2579 * 2580 * An application client releases the persistent reservation by issuing 2581 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2582 * an I_T nexus that is a persistent reservation holder with the 2583 * following parameters: 2584 * 2585 * a) RESERVATION KEY field set to the value of the reservation key 2586 * that is registered with the logical unit for the I_T nexus; 2587 */ 2588 if (res_key != pr_reg->pr_res_key) { 2589 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2590 " does not match existing SA REGISTER res_key:" 2591 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2592 spin_unlock(&dev->dev_reservation_lock); 2593 ret = TCM_RESERVATION_CONFLICT; 2594 goto out_put_pr_reg; 2595 } 2596 /* 2597 * From spc4r17 Section 5.7.11.2 Releasing and above: 2598 * 2599 * b) TYPE field and SCOPE field set to match the persistent 2600 * reservation being released. 2601 */ 2602 if ((pr_res_holder->pr_res_type != type) || 2603 (pr_res_holder->pr_res_scope != scope)) { 2604 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2605 pr_err("SPC-3 PR RELEASE: Attempted to release" 2606 " reservation from [%s]: %s with different TYPE " 2607 "and/or SCOPE while reservation already held by" 2608 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2609 cmd->se_tfo->get_fabric_name(), 2610 se_sess->se_node_acl->initiatorname, 2611 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2612 pr_res_holder->pr_reg_nacl->initiatorname); 2613 2614 spin_unlock(&dev->dev_reservation_lock); 2615 ret = TCM_RESERVATION_CONFLICT; 2616 goto out_put_pr_reg; 2617 } 2618 /* 2619 * In response to a persistent reservation release request from the 2620 * persistent reservation holder the device server shall perform a 2621 * release by doing the following as an uninterrupted series of actions: 2622 * a) Release the persistent reservation; 2623 * b) Not remove any registration(s); 2624 * c) If the released persistent reservation is a registrants only type 2625 * or all registrants type persistent reservation, 2626 * the device server shall establish a unit attention condition for 2627 * the initiator port associated with every regis- 2628 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2629 * RESERVE OUT command with RELEASE service action was received, 2630 * with the additional sense code set to RESERVATIONS RELEASED; and 2631 * d) If the persistent reservation is of any other type, the device 2632 * server shall not establish a unit attention condition. 2633 */ 2634 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2635 pr_reg, 1, 0); 2636 2637 spin_unlock(&dev->dev_reservation_lock); 2638 2639 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2640 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2641 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2642 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2643 /* 2644 * If no UNIT ATTENTION conditions will be established for 2645 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2646 * go ahead and check for APTPL=1 update+write below 2647 */ 2648 goto write_aptpl; 2649 } 2650 2651 spin_lock(&pr_tmpl->registration_lock); 2652 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2653 pr_reg_list) { 2654 /* 2655 * Do not establish a UNIT ATTENTION condition 2656 * for the calling I_T Nexus 2657 */ 2658 if (pr_reg_p == pr_reg) 2659 continue; 2660 2661 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2662 pr_reg_p->pr_res_mapped_lun, 2663 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2664 } 2665 spin_unlock(&pr_tmpl->registration_lock); 2666 2667 write_aptpl: 2668 if (pr_tmpl->pr_aptpl_active) 2669 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2670 2671 out_put_pr_reg: 2672 core_scsi3_put_pr_reg(pr_reg); 2673 return ret; 2674 } 2675 2676 static sense_reason_t 2677 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2678 { 2679 struct se_device *dev = cmd->se_dev; 2680 struct se_node_acl *pr_reg_nacl; 2681 struct se_session *se_sess = cmd->se_sess; 2682 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2683 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2684 u64 pr_res_mapped_lun = 0; 2685 int calling_it_nexus = 0; 2686 /* 2687 * Locate the existing *pr_reg via struct se_node_acl pointers 2688 */ 2689 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2690 se_sess->se_node_acl, se_sess); 2691 if (!pr_reg_n) { 2692 pr_err("SPC-3 PR: Unable to locate" 2693 " PR_REGISTERED *pr_reg for CLEAR\n"); 2694 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2695 } 2696 /* 2697 * From spc4r17 section 5.7.11.6, Clearing: 2698 * 2699 * Any application client may release the persistent reservation and 2700 * remove all registrations from a device server by issuing a 2701 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2702 * registered I_T nexus with the following parameter: 2703 * 2704 * a) RESERVATION KEY field set to the value of the reservation key 2705 * that is registered with the logical unit for the I_T nexus. 2706 */ 2707 if (res_key != pr_reg_n->pr_res_key) { 2708 pr_err("SPC-3 PR REGISTER: Received" 2709 " res_key: 0x%016Lx does not match" 2710 " existing SA REGISTER res_key:" 2711 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2712 core_scsi3_put_pr_reg(pr_reg_n); 2713 return TCM_RESERVATION_CONFLICT; 2714 } 2715 /* 2716 * a) Release the persistent reservation, if any; 2717 */ 2718 spin_lock(&dev->dev_reservation_lock); 2719 pr_res_holder = dev->dev_pr_res_holder; 2720 if (pr_res_holder) { 2721 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2722 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2723 pr_res_holder, 0, 0); 2724 } 2725 spin_unlock(&dev->dev_reservation_lock); 2726 /* 2727 * b) Remove all registration(s) (see spc4r17 5.7.7); 2728 */ 2729 spin_lock(&pr_tmpl->registration_lock); 2730 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2731 &pr_tmpl->registration_list, pr_reg_list) { 2732 2733 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2734 pr_reg_nacl = pr_reg->pr_reg_nacl; 2735 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2736 __core_scsi3_free_registration(dev, pr_reg, NULL, 2737 calling_it_nexus); 2738 /* 2739 * e) Establish a unit attention condition for the initiator 2740 * port associated with every registered I_T nexus other 2741 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2742 * command with CLEAR service action was received, with the 2743 * additional sense code set to RESERVATIONS PREEMPTED. 2744 */ 2745 if (!calling_it_nexus) 2746 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2747 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2748 } 2749 spin_unlock(&pr_tmpl->registration_lock); 2750 2751 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2752 cmd->se_tfo->get_fabric_name()); 2753 2754 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2755 2756 core_scsi3_pr_generation(dev); 2757 return 0; 2758 } 2759 2760 /* 2761 * Called with struct se_device->dev_reservation_lock held. 2762 */ 2763 static void __core_scsi3_complete_pro_preempt( 2764 struct se_device *dev, 2765 struct t10_pr_registration *pr_reg, 2766 struct list_head *preempt_and_abort_list, 2767 int type, 2768 int scope, 2769 enum preempt_type preempt_type) 2770 { 2771 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2772 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2773 char i_buf[PR_REG_ISID_ID_LEN]; 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->get_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->get_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_LOGICAL_UNIT_COMMUNICATION_FAILURE; 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_LOGICAL_UNIT_COMMUNICATION_FAILURE; 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->get_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 (const char *)&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->get_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->get_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->get_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->get_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->get_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_INVALID_PARAMETER_LIST; 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->get_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->get_fabric_name(), pr_reg_nacl->initiatorname, 3507 i_buf, dest_tf_ops->get_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 transport_kunmap_data_sg(cmd); 3531 3532 core_scsi3_put_pr_reg(dest_pr_reg); 3533 return 0; 3534 out: 3535 if (buf) 3536 transport_kunmap_data_sg(cmd); 3537 if (dest_se_deve) 3538 core_scsi3_lunacl_undepend_item(dest_se_deve); 3539 if (dest_node_acl) 3540 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3541 core_scsi3_tpg_undepend_item(dest_se_tpg); 3542 3543 out_put_pr_reg: 3544 core_scsi3_put_pr_reg(pr_reg); 3545 return ret; 3546 } 3547 3548 /* 3549 * See spc4r17 section 6.14 Table 170 3550 */ 3551 sense_reason_t 3552 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3553 { 3554 struct se_device *dev = cmd->se_dev; 3555 unsigned char *cdb = &cmd->t_task_cdb[0]; 3556 unsigned char *buf; 3557 u64 res_key, sa_res_key; 3558 int sa, scope, type, aptpl; 3559 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3560 sense_reason_t ret; 3561 3562 /* 3563 * Following spc2r20 5.5.1 Reservations overview: 3564 * 3565 * If a logical unit has been reserved by any RESERVE command and is 3566 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3567 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3568 * initiator or service action and shall terminate with a RESERVATION 3569 * CONFLICT status. 3570 */ 3571 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3572 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3573 " SPC-2 reservation is held, returning" 3574 " RESERVATION_CONFLICT\n"); 3575 return TCM_RESERVATION_CONFLICT; 3576 } 3577 3578 /* 3579 * FIXME: A NULL struct se_session pointer means an this is not coming from 3580 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3581 */ 3582 if (!cmd->se_sess) 3583 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3584 3585 if (cmd->data_length < 24) { 3586 pr_warn("SPC-PR: Received PR OUT parameter list" 3587 " length too small: %u\n", cmd->data_length); 3588 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3589 } 3590 3591 /* 3592 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3593 */ 3594 sa = (cdb[1] & 0x1f); 3595 scope = (cdb[2] & 0xf0); 3596 type = (cdb[2] & 0x0f); 3597 3598 buf = transport_kmap_data_sg(cmd); 3599 if (!buf) 3600 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3601 3602 /* 3603 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3604 */ 3605 res_key = get_unaligned_be64(&buf[0]); 3606 sa_res_key = get_unaligned_be64(&buf[8]); 3607 /* 3608 * REGISTER_AND_MOVE uses a different SA parameter list containing 3609 * SCSI TransportIDs. 3610 */ 3611 if (sa != PRO_REGISTER_AND_MOVE) { 3612 spec_i_pt = (buf[20] & 0x08); 3613 all_tg_pt = (buf[20] & 0x04); 3614 aptpl = (buf[20] & 0x01); 3615 } else { 3616 aptpl = (buf[17] & 0x01); 3617 unreg = (buf[17] & 0x02); 3618 } 3619 /* 3620 * If the backend device has been configured to force APTPL metadata 3621 * write-out, go ahead and propigate aptpl=1 down now. 3622 */ 3623 if (dev->dev_attrib.force_pr_aptpl) 3624 aptpl = 1; 3625 3626 transport_kunmap_data_sg(cmd); 3627 buf = NULL; 3628 3629 /* 3630 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3631 */ 3632 if (spec_i_pt && (sa != PRO_REGISTER)) 3633 return TCM_INVALID_PARAMETER_LIST; 3634 3635 /* 3636 * From spc4r17 section 6.14: 3637 * 3638 * If the SPEC_I_PT bit is set to zero, the service action is not 3639 * REGISTER AND MOVE, and the parameter list length is not 24, then 3640 * the command shall be terminated with CHECK CONDITION status, with 3641 * the sense key set to ILLEGAL REQUEST, and the additional sense 3642 * code set to PARAMETER LIST LENGTH ERROR. 3643 */ 3644 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3645 (cmd->data_length != 24)) { 3646 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3647 " list length: %u\n", cmd->data_length); 3648 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3649 } 3650 3651 /* 3652 * (core_scsi3_emulate_pro_* function parameters 3653 * are defined by spc4r17 Table 174: 3654 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3655 */ 3656 switch (sa) { 3657 case PRO_REGISTER: 3658 ret = core_scsi3_emulate_pro_register(cmd, 3659 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3660 break; 3661 case PRO_RESERVE: 3662 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3663 break; 3664 case PRO_RELEASE: 3665 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3666 break; 3667 case PRO_CLEAR: 3668 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3669 break; 3670 case PRO_PREEMPT: 3671 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3672 res_key, sa_res_key, PREEMPT); 3673 break; 3674 case PRO_PREEMPT_AND_ABORT: 3675 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3676 res_key, sa_res_key, PREEMPT_AND_ABORT); 3677 break; 3678 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3679 ret = core_scsi3_emulate_pro_register(cmd, 3680 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3681 break; 3682 case PRO_REGISTER_AND_MOVE: 3683 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3684 sa_res_key, aptpl, unreg); 3685 break; 3686 default: 3687 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3688 " action: 0x%02x\n", sa); 3689 return TCM_INVALID_CDB_FIELD; 3690 } 3691 3692 if (!ret) 3693 target_complete_cmd(cmd, GOOD); 3694 return ret; 3695 } 3696 3697 /* 3698 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3699 * 3700 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3701 */ 3702 static sense_reason_t 3703 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3704 { 3705 struct se_device *dev = cmd->se_dev; 3706 struct t10_pr_registration *pr_reg; 3707 unsigned char *buf; 3708 u32 add_len = 0, off = 8; 3709 3710 if (cmd->data_length < 8) { 3711 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3712 " too small\n", cmd->data_length); 3713 return TCM_INVALID_CDB_FIELD; 3714 } 3715 3716 buf = transport_kmap_data_sg(cmd); 3717 if (!buf) 3718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3719 3720 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3721 3722 spin_lock(&dev->t10_pr.registration_lock); 3723 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3724 pr_reg_list) { 3725 /* 3726 * Check for overflow of 8byte PRI READ_KEYS payload and 3727 * next reservation key list descriptor. 3728 */ 3729 if ((add_len + 8) > (cmd->data_length - 8)) 3730 break; 3731 3732 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3733 off += 8; 3734 add_len += 8; 3735 } 3736 spin_unlock(&dev->t10_pr.registration_lock); 3737 3738 put_unaligned_be32(add_len, &buf[4]); 3739 3740 transport_kunmap_data_sg(cmd); 3741 3742 return 0; 3743 } 3744 3745 /* 3746 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3747 * 3748 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3749 */ 3750 static sense_reason_t 3751 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3752 { 3753 struct se_device *dev = cmd->se_dev; 3754 struct t10_pr_registration *pr_reg; 3755 unsigned char *buf; 3756 u64 pr_res_key; 3757 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3758 3759 if (cmd->data_length < 8) { 3760 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3761 " too small\n", cmd->data_length); 3762 return TCM_INVALID_CDB_FIELD; 3763 } 3764 3765 buf = transport_kmap_data_sg(cmd); 3766 if (!buf) 3767 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3768 3769 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3770 3771 spin_lock(&dev->dev_reservation_lock); 3772 pr_reg = dev->dev_pr_res_holder; 3773 if (pr_reg) { 3774 /* 3775 * Set the hardcoded Additional Length 3776 */ 3777 put_unaligned_be32(add_len, &buf[4]); 3778 3779 if (cmd->data_length < 22) 3780 goto err; 3781 3782 /* 3783 * Set the Reservation key. 3784 * 3785 * From spc4r17, section 5.7.10: 3786 * A persistent reservation holder has its reservation key 3787 * returned in the parameter data from a PERSISTENT 3788 * RESERVE IN command with READ RESERVATION service action as 3789 * follows: 3790 * a) For a persistent reservation of the type Write Exclusive 3791 * - All Registrants or Exclusive Access All Regitrants, 3792 * the reservation key shall be set to zero; or 3793 * b) For all other persistent reservation types, the 3794 * reservation key shall be set to the registered 3795 * reservation key for the I_T nexus that holds the 3796 * persistent reservation. 3797 */ 3798 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3799 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3800 pr_res_key = 0; 3801 else 3802 pr_res_key = pr_reg->pr_res_key; 3803 3804 put_unaligned_be64(pr_res_key, &buf[8]); 3805 /* 3806 * Set the SCOPE and TYPE 3807 */ 3808 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3809 (pr_reg->pr_res_type & 0x0f); 3810 } 3811 3812 err: 3813 spin_unlock(&dev->dev_reservation_lock); 3814 transport_kunmap_data_sg(cmd); 3815 3816 return 0; 3817 } 3818 3819 /* 3820 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3821 * 3822 * See spc4r17 section 6.13.4 Table 165 3823 */ 3824 static sense_reason_t 3825 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3826 { 3827 struct se_device *dev = cmd->se_dev; 3828 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3829 unsigned char *buf; 3830 u16 add_len = 8; /* Hardcoded to 8. */ 3831 3832 if (cmd->data_length < 6) { 3833 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3834 " %u too small\n", cmd->data_length); 3835 return TCM_INVALID_CDB_FIELD; 3836 } 3837 3838 buf = transport_kmap_data_sg(cmd); 3839 if (!buf) 3840 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3841 3842 put_unaligned_be16(add_len, &buf[0]); 3843 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3844 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3845 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3846 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3847 /* 3848 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3849 * set the TMV: Task Mask Valid bit. 3850 */ 3851 buf[3] |= 0x80; 3852 /* 3853 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3854 */ 3855 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3856 /* 3857 * PTPL_A: Persistence across Target Power Loss Active bit 3858 */ 3859 if (pr_tmpl->pr_aptpl_active) 3860 buf[3] |= 0x01; 3861 /* 3862 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3863 */ 3864 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3865 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3866 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3867 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3868 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3869 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3870 3871 transport_kunmap_data_sg(cmd); 3872 3873 return 0; 3874 } 3875 3876 /* 3877 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3878 * 3879 * See spc4r17 section 6.13.5 Table 168 and 169 3880 */ 3881 static sense_reason_t 3882 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3883 { 3884 struct se_device *dev = cmd->se_dev; 3885 struct se_node_acl *se_nacl; 3886 struct se_portal_group *se_tpg; 3887 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3888 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3889 unsigned char *buf; 3890 u32 add_desc_len = 0, add_len = 0; 3891 u32 off = 8; /* off into first Full Status descriptor */ 3892 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3893 int exp_desc_len, desc_len; 3894 bool all_reg = false; 3895 3896 if (cmd->data_length < 8) { 3897 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3898 " too small\n", cmd->data_length); 3899 return TCM_INVALID_CDB_FIELD; 3900 } 3901 3902 buf = transport_kmap_data_sg(cmd); 3903 if (!buf) 3904 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3905 3906 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3907 3908 spin_lock(&dev->dev_reservation_lock); 3909 if (dev->dev_pr_res_holder) { 3910 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3911 3912 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3913 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3914 all_reg = true; 3915 pr_res_type = pr_holder->pr_res_type; 3916 pr_res_scope = pr_holder->pr_res_scope; 3917 } 3918 } 3919 spin_unlock(&dev->dev_reservation_lock); 3920 3921 spin_lock(&pr_tmpl->registration_lock); 3922 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3923 &pr_tmpl->registration_list, pr_reg_list) { 3924 3925 se_nacl = pr_reg->pr_reg_nacl; 3926 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3927 add_desc_len = 0; 3928 3929 atomic_inc_mb(&pr_reg->pr_res_holders); 3930 spin_unlock(&pr_tmpl->registration_lock); 3931 /* 3932 * Determine expected length of $FABRIC_MOD specific 3933 * TransportID full status descriptor.. 3934 */ 3935 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3936 &format_code); 3937 if (exp_desc_len < 0 || 3938 exp_desc_len + add_len > cmd->data_length) { 3939 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3940 " out of buffer: %d\n", cmd->data_length); 3941 spin_lock(&pr_tmpl->registration_lock); 3942 atomic_dec_mb(&pr_reg->pr_res_holders); 3943 break; 3944 } 3945 /* 3946 * Set RESERVATION KEY 3947 */ 3948 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3949 off += 8; 3950 off += 4; /* Skip Over Reserved area */ 3951 3952 /* 3953 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3954 */ 3955 if (pr_reg->pr_reg_all_tg_pt) 3956 buf[off] = 0x02; 3957 /* 3958 * The struct se_lun pointer will be present for the 3959 * reservation holder for PR_HOLDER bit. 3960 * 3961 * Also, if this registration is the reservation 3962 * holder or there is an All Registrants reservation 3963 * active, fill in SCOPE and TYPE in the next byte. 3964 */ 3965 if (pr_reg->pr_res_holder) { 3966 buf[off++] |= 0x01; 3967 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3968 (pr_reg->pr_res_type & 0x0f); 3969 } else if (all_reg) { 3970 buf[off++] |= 0x01; 3971 buf[off++] = (pr_res_scope & 0xf0) | 3972 (pr_res_type & 0x0f); 3973 } else { 3974 off += 2; 3975 } 3976 3977 off += 4; /* Skip over reserved area */ 3978 /* 3979 * From spc4r17 6.3.15: 3980 * 3981 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3982 * IDENTIFIER field contains the relative port identifier (see 3983 * 3.1.120) of the target port that is part of the I_T nexus 3984 * described by this full status descriptor. If the ALL_TG_PT 3985 * bit is set to one, the contents of the RELATIVE TARGET PORT 3986 * IDENTIFIER field are not defined by this standard. 3987 */ 3988 if (!pr_reg->pr_reg_all_tg_pt) { 3989 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 3990 3991 put_unaligned_be16(sep_rtpi, &buf[off]); 3992 off += 2; 3993 } else 3994 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3995 3996 buf[off+4] = se_tpg->proto_id; 3997 3998 /* 3999 * Now, have the $FABRIC_MOD fill in the transport ID. 4000 */ 4001 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4002 &format_code, &buf[off+4]); 4003 4004 spin_lock(&pr_tmpl->registration_lock); 4005 atomic_dec_mb(&pr_reg->pr_res_holders); 4006 4007 if (desc_len < 0) 4008 break; 4009 /* 4010 * Set the ADDITIONAL DESCRIPTOR LENGTH 4011 */ 4012 put_unaligned_be32(desc_len, &buf[off]); 4013 /* 4014 * Size of full desctipor header minus TransportID 4015 * containing $FABRIC_MOD specific) initiator device/port 4016 * WWN information. 4017 * 4018 * See spc4r17 Section 6.13.5 Table 169 4019 */ 4020 add_desc_len = (24 + desc_len); 4021 4022 off += desc_len; 4023 add_len += add_desc_len; 4024 } 4025 spin_unlock(&pr_tmpl->registration_lock); 4026 /* 4027 * Set ADDITIONAL_LENGTH 4028 */ 4029 put_unaligned_be32(add_len, &buf[4]); 4030 4031 transport_kunmap_data_sg(cmd); 4032 4033 return 0; 4034 } 4035 4036 sense_reason_t 4037 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4038 { 4039 sense_reason_t ret; 4040 4041 /* 4042 * Following spc2r20 5.5.1 Reservations overview: 4043 * 4044 * If a logical unit has been reserved by any RESERVE command and is 4045 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4046 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4047 * initiator or service action and shall terminate with a RESERVATION 4048 * CONFLICT status. 4049 */ 4050 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4051 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4052 " SPC-2 reservation is held, returning" 4053 " RESERVATION_CONFLICT\n"); 4054 return TCM_RESERVATION_CONFLICT; 4055 } 4056 4057 switch (cmd->t_task_cdb[1] & 0x1f) { 4058 case PRI_READ_KEYS: 4059 ret = core_scsi3_pri_read_keys(cmd); 4060 break; 4061 case PRI_READ_RESERVATION: 4062 ret = core_scsi3_pri_read_reservation(cmd); 4063 break; 4064 case PRI_REPORT_CAPABILITIES: 4065 ret = core_scsi3_pri_report_capabilities(cmd); 4066 break; 4067 case PRI_READ_FULL_STATUS: 4068 ret = core_scsi3_pri_read_full_status(cmd); 4069 break; 4070 default: 4071 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4072 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4073 return TCM_INVALID_CDB_FIELD; 4074 } 4075 4076 if (!ret) 4077 target_complete_cmd(cmd, GOOD); 4078 return ret; 4079 } 4080 4081 sense_reason_t 4082 target_check_reservation(struct se_cmd *cmd) 4083 { 4084 struct se_device *dev = cmd->se_dev; 4085 sense_reason_t ret; 4086 4087 if (!cmd->se_sess) 4088 return 0; 4089 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4090 return 0; 4091 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4092 return 0; 4093 4094 spin_lock(&dev->dev_reservation_lock); 4095 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4096 ret = target_scsi2_reservation_check(cmd); 4097 else 4098 ret = target_scsi3_pr_reservation_check(cmd); 4099 spin_unlock(&dev->dev_reservation_lock); 4100 4101 return ret; 4102 } 4103