1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/vmalloc.h> 31 #include <linux/file.h> 32 #include <linux/fcntl.h> 33 #include <linux/fs.h> 34 #include <scsi/scsi_proto.h> 35 #include <asm/unaligned.h> 36 37 #include <target/target_core_base.h> 38 #include <target/target_core_backend.h> 39 #include <target/target_core_fabric.h> 40 41 #include "target_core_internal.h" 42 #include "target_core_pr.h" 43 #include "target_core_ua.h" 44 45 /* 46 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 47 */ 48 struct pr_transport_id_holder { 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 void core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) { 62 buf[0] = '\0'; 63 return; 64 } 65 66 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 67 } 68 69 enum register_type { 70 REGISTER, 71 REGISTER_AND_IGNORE_EXISTING_KEY, 72 REGISTER_AND_MOVE, 73 }; 74 75 enum preempt_type { 76 PREEMPT, 77 PREEMPT_AND_ABORT, 78 }; 79 80 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 81 struct t10_pr_registration *, int, int); 82 83 static int is_reservation_holder( 84 struct t10_pr_registration *pr_res_holder, 85 struct t10_pr_registration *pr_reg) 86 { 87 int pr_res_type; 88 89 if (pr_res_holder) { 90 pr_res_type = pr_res_holder->pr_res_type; 91 92 return pr_res_holder == pr_reg || 93 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 94 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 95 } 96 return 0; 97 } 98 99 static sense_reason_t 100 target_scsi2_reservation_check(struct se_cmd *cmd) 101 { 102 struct se_device *dev = cmd->se_dev; 103 struct se_session *sess = cmd->se_sess; 104 105 switch (cmd->t_task_cdb[0]) { 106 case INQUIRY: 107 case RELEASE: 108 case RELEASE_10: 109 return 0; 110 default: 111 break; 112 } 113 114 if (!dev->dev_reserved_node_acl || !sess) 115 return 0; 116 117 if (dev->dev_reserved_node_acl != sess->se_node_acl) 118 return TCM_RESERVATION_CONFLICT; 119 120 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 121 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 122 return TCM_RESERVATION_CONFLICT; 123 } 124 125 return 0; 126 } 127 128 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 129 struct se_node_acl *, struct se_session *); 130 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 131 132 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 133 { 134 struct se_session *se_sess = cmd->se_sess; 135 struct se_device *dev = cmd->se_dev; 136 struct t10_pr_registration *pr_reg; 137 struct t10_reservation *pr_tmpl = &dev->t10_pr; 138 int conflict = 0; 139 140 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 141 se_sess); 142 if (pr_reg) { 143 /* 144 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 145 * behavior 146 * 147 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 148 * status, but no reservation shall be established and the 149 * persistent reservation shall not be changed, if the command 150 * is received from a) and b) below. 151 * 152 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 153 * status, but the persistent reservation shall not be released, 154 * if the command is received from a) and b) 155 * 156 * a) An I_T nexus that is a persistent reservation holder; or 157 * b) An I_T nexus that is registered if a registrants only or 158 * all registrants type persistent reservation is present. 159 * 160 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 161 * RELEASE(6) command, or RELEASE(10) command shall be processed 162 * as defined in SPC-2. 163 */ 164 if (pr_reg->pr_res_holder) { 165 core_scsi3_put_pr_reg(pr_reg); 166 return 1; 167 } 168 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 169 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 170 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 171 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 172 core_scsi3_put_pr_reg(pr_reg); 173 return 1; 174 } 175 core_scsi3_put_pr_reg(pr_reg); 176 conflict = 1; 177 } else { 178 /* 179 * Following spc2r20 5.5.1 Reservations overview: 180 * 181 * If a logical unit has executed a PERSISTENT RESERVE OUT 182 * command with the REGISTER or the REGISTER AND IGNORE 183 * EXISTING KEY service action and is still registered by any 184 * initiator, all RESERVE commands and all RELEASE commands 185 * regardless of initiator shall conflict and shall terminate 186 * with a RESERVATION CONFLICT status. 187 */ 188 spin_lock(&pr_tmpl->registration_lock); 189 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 190 spin_unlock(&pr_tmpl->registration_lock); 191 } 192 193 if (conflict) { 194 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 195 " while active SPC-3 registrations exist," 196 " returning RESERVATION_CONFLICT\n"); 197 return -EBUSY; 198 } 199 200 return 0; 201 } 202 203 sense_reason_t 204 target_scsi2_reservation_release(struct se_cmd *cmd) 205 { 206 struct se_device *dev = cmd->se_dev; 207 struct se_session *sess = cmd->se_sess; 208 struct se_portal_group *tpg; 209 int rc; 210 211 if (!sess || !sess->se_tpg) 212 goto out; 213 rc = target_check_scsi2_reservation_conflict(cmd); 214 if (rc == 1) 215 goto out; 216 if (rc < 0) 217 return TCM_RESERVATION_CONFLICT; 218 219 spin_lock(&dev->dev_reservation_lock); 220 if (!dev->dev_reserved_node_acl || !sess) 221 goto out_unlock; 222 223 if (dev->dev_reserved_node_acl != sess->se_node_acl) 224 goto out_unlock; 225 226 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 227 goto out_unlock; 228 229 dev->dev_reserved_node_acl = NULL; 230 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 231 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 232 dev->dev_res_bin_isid = 0; 233 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 234 } 235 tpg = sess->se_tpg; 236 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 237 " MAPPED LUN: %llu for %s\n", 238 tpg->se_tpg_tfo->get_fabric_name(), 239 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 240 sess->se_node_acl->initiatorname); 241 242 out_unlock: 243 spin_unlock(&dev->dev_reservation_lock); 244 out: 245 target_complete_cmd(cmd, GOOD); 246 return 0; 247 } 248 249 sense_reason_t 250 target_scsi2_reservation_reserve(struct se_cmd *cmd) 251 { 252 struct se_device *dev = cmd->se_dev; 253 struct se_session *sess = cmd->se_sess; 254 struct se_portal_group *tpg; 255 sense_reason_t ret = 0; 256 int rc; 257 258 if ((cmd->t_task_cdb[1] & 0x01) && 259 (cmd->t_task_cdb[1] & 0x02)) { 260 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 261 return TCM_UNSUPPORTED_SCSI_OPCODE; 262 } 263 /* 264 * This is currently the case for target_core_mod passthrough struct se_cmd 265 * ops 266 */ 267 if (!sess || !sess->se_tpg) 268 goto out; 269 rc = target_check_scsi2_reservation_conflict(cmd); 270 if (rc == 1) 271 goto out; 272 273 if (rc < 0) 274 return TCM_RESERVATION_CONFLICT; 275 276 tpg = sess->se_tpg; 277 spin_lock(&dev->dev_reservation_lock); 278 if (dev->dev_reserved_node_acl && 279 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 280 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 281 tpg->se_tpg_tfo->get_fabric_name()); 282 pr_err("Original reserver LUN: %llu %s\n", 283 cmd->se_lun->unpacked_lun, 284 dev->dev_reserved_node_acl->initiatorname); 285 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 286 " from %s \n", cmd->se_lun->unpacked_lun, 287 cmd->orig_fe_lun, 288 sess->se_node_acl->initiatorname); 289 ret = TCM_RESERVATION_CONFLICT; 290 goto out_unlock; 291 } 292 293 dev->dev_reserved_node_acl = sess->se_node_acl; 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 295 if (sess->sess_bin_isid != 0) { 296 dev->dev_res_bin_isid = sess->sess_bin_isid; 297 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 298 } 299 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 300 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 301 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 302 sess->se_node_acl->initiatorname); 303 304 out_unlock: 305 spin_unlock(&dev->dev_reservation_lock); 306 out: 307 if (!ret) 308 target_complete_cmd(cmd, GOOD); 309 return ret; 310 } 311 312 313 /* 314 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 315 * 316 * This function is called by those initiator ports who are *NOT* 317 * the active PR reservation holder when a reservation is present. 318 */ 319 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 320 bool isid_mismatch) 321 { 322 unsigned char *cdb = cmd->t_task_cdb; 323 struct se_session *se_sess = cmd->se_sess; 324 struct se_node_acl *nacl = se_sess->se_node_acl; 325 int other_cdb = 0; 326 int registered_nexus = 0, ret = 1; /* Conflict by default */ 327 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 328 int we = 0; /* Write Exclusive */ 329 int legacy = 0; /* Act like a legacy device and return 330 * RESERVATION CONFLICT on some CDBs */ 331 332 if (isid_mismatch) { 333 registered_nexus = 0; 334 } else { 335 struct se_dev_entry *se_deve; 336 337 rcu_read_lock(); 338 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 339 if (se_deve) 340 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 341 &se_deve->deve_flags); 342 rcu_read_unlock(); 343 } 344 345 switch (pr_reg_type) { 346 case PR_TYPE_WRITE_EXCLUSIVE: 347 we = 1; 348 case PR_TYPE_EXCLUSIVE_ACCESS: 349 /* 350 * Some commands are only allowed for the persistent reservation 351 * holder. 352 */ 353 break; 354 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 355 we = 1; 356 /* fall through */ 357 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 358 /* 359 * Some commands are only allowed for registered I_T Nexuses. 360 */ 361 reg_only = 1; 362 break; 363 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 364 we = 1; 365 /* fall through */ 366 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 367 /* 368 * Each registered I_T Nexus is a reservation holder. 369 */ 370 all_reg = 1; 371 break; 372 default: 373 return -EINVAL; 374 } 375 /* 376 * Referenced from spc4r17 table 45 for *NON* PR holder access 377 */ 378 switch (cdb[0]) { 379 case SECURITY_PROTOCOL_IN: 380 if (registered_nexus) 381 return 0; 382 ret = (we) ? 0 : 1; 383 break; 384 case MODE_SENSE: 385 case MODE_SENSE_10: 386 case READ_ATTRIBUTE: 387 case READ_BUFFER: 388 case RECEIVE_DIAGNOSTIC: 389 if (legacy) { 390 ret = 1; 391 break; 392 } 393 if (registered_nexus) { 394 ret = 0; 395 break; 396 } 397 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 398 break; 399 case PERSISTENT_RESERVE_OUT: 400 /* 401 * This follows PERSISTENT_RESERVE_OUT service actions that 402 * are allowed in the presence of various reservations. 403 * See spc4r17, table 46 404 */ 405 switch (cdb[1] & 0x1f) { 406 case PRO_CLEAR: 407 case PRO_PREEMPT: 408 case PRO_PREEMPT_AND_ABORT: 409 ret = (registered_nexus) ? 0 : 1; 410 break; 411 case PRO_REGISTER: 412 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 413 ret = 0; 414 break; 415 case PRO_REGISTER_AND_MOVE: 416 case PRO_RESERVE: 417 ret = 1; 418 break; 419 case PRO_RELEASE: 420 ret = (registered_nexus) ? 0 : 1; 421 break; 422 default: 423 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 424 " action: 0x%02x\n", cdb[1] & 0x1f); 425 return -EINVAL; 426 } 427 break; 428 case RELEASE: 429 case RELEASE_10: 430 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 431 ret = 0; 432 break; 433 case RESERVE: 434 case RESERVE_10: 435 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 436 ret = 0; 437 break; 438 case TEST_UNIT_READY: 439 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 440 break; 441 case MAINTENANCE_IN: 442 switch (cdb[1] & 0x1f) { 443 case MI_MANAGEMENT_PROTOCOL_IN: 444 if (registered_nexus) { 445 ret = 0; 446 break; 447 } 448 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 449 break; 450 case MI_REPORT_SUPPORTED_OPERATION_CODES: 451 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 452 if (legacy) { 453 ret = 1; 454 break; 455 } 456 if (registered_nexus) { 457 ret = 0; 458 break; 459 } 460 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 461 break; 462 case MI_REPORT_ALIASES: 463 case MI_REPORT_IDENTIFYING_INFORMATION: 464 case MI_REPORT_PRIORITY: 465 case MI_REPORT_TARGET_PGS: 466 case MI_REPORT_TIMESTAMP: 467 ret = 0; /* Allowed */ 468 break; 469 default: 470 pr_err("Unknown MI Service Action: 0x%02x\n", 471 (cdb[1] & 0x1f)); 472 return -EINVAL; 473 } 474 break; 475 case ACCESS_CONTROL_IN: 476 case ACCESS_CONTROL_OUT: 477 case INQUIRY: 478 case LOG_SENSE: 479 case SERVICE_ACTION_IN_12: 480 case REPORT_LUNS: 481 case REQUEST_SENSE: 482 case PERSISTENT_RESERVE_IN: 483 ret = 0; /*/ Allowed CDBs */ 484 break; 485 default: 486 other_cdb = 1; 487 break; 488 } 489 /* 490 * Case where the CDB is explicitly allowed in the above switch 491 * statement. 492 */ 493 if (!ret && !other_cdb) { 494 pr_debug("Allowing explicit CDB: 0x%02x for %s" 495 " reservation holder\n", cdb[0], 496 core_scsi3_pr_dump_type(pr_reg_type)); 497 498 return ret; 499 } 500 /* 501 * Check if write exclusive initiator ports *NOT* holding the 502 * WRITE_EXCLUSIVE_* reservation. 503 */ 504 if (we && !registered_nexus) { 505 if (cmd->data_direction == DMA_TO_DEVICE) { 506 /* 507 * Conflict for write exclusive 508 */ 509 pr_debug("%s Conflict for unregistered nexus" 510 " %s CDB: 0x%02x to %s reservation\n", 511 transport_dump_cmd_direction(cmd), 512 se_sess->se_node_acl->initiatorname, cdb[0], 513 core_scsi3_pr_dump_type(pr_reg_type)); 514 return 1; 515 } else { 516 /* 517 * Allow non WRITE CDBs for all Write Exclusive 518 * PR TYPEs to pass for registered and 519 * non-registered_nexuxes NOT holding the reservation. 520 * 521 * We only make noise for the unregisterd nexuses, 522 * as we expect registered non-reservation holding 523 * nexuses to issue CDBs. 524 */ 525 526 if (!registered_nexus) { 527 pr_debug("Allowing implicit CDB: 0x%02x" 528 " for %s reservation on unregistered" 529 " nexus\n", cdb[0], 530 core_scsi3_pr_dump_type(pr_reg_type)); 531 } 532 533 return 0; 534 } 535 } else if ((reg_only) || (all_reg)) { 536 if (registered_nexus) { 537 /* 538 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 539 * allow commands from registered nexuses. 540 */ 541 542 pr_debug("Allowing implicit CDB: 0x%02x for %s" 543 " reservation\n", cdb[0], 544 core_scsi3_pr_dump_type(pr_reg_type)); 545 546 return 0; 547 } 548 } else if (we && registered_nexus) { 549 /* 550 * Reads are allowed for Write Exclusive locks 551 * from all registrants. 552 */ 553 if (cmd->data_direction == DMA_FROM_DEVICE) { 554 pr_debug("Allowing READ CDB: 0x%02x for %s" 555 " reservation\n", cdb[0], 556 core_scsi3_pr_dump_type(pr_reg_type)); 557 558 return 0; 559 } 560 } 561 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 562 " for %s reservation\n", transport_dump_cmd_direction(cmd), 563 (registered_nexus) ? "" : "un", 564 se_sess->se_node_acl->initiatorname, cdb[0], 565 core_scsi3_pr_dump_type(pr_reg_type)); 566 567 return 1; /* Conflict by default */ 568 } 569 570 static sense_reason_t 571 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 572 { 573 struct se_device *dev = cmd->se_dev; 574 struct se_session *sess = cmd->se_sess; 575 u32 pr_reg_type; 576 bool isid_mismatch = false; 577 578 if (!dev->dev_pr_res_holder) 579 return 0; 580 581 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 582 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 583 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 584 goto check_nonholder; 585 586 if (dev->dev_pr_res_holder->isid_present_at_reg) { 587 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 588 sess->sess_bin_isid) { 589 isid_mismatch = true; 590 goto check_nonholder; 591 } 592 } 593 594 return 0; 595 596 check_nonholder: 597 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 598 return TCM_RESERVATION_CONFLICT; 599 return 0; 600 } 601 602 static u32 core_scsi3_pr_generation(struct se_device *dev) 603 { 604 u32 prg; 605 606 /* 607 * PRGeneration field shall contain the value of a 32-bit wrapping 608 * counter mainted by the device server. 609 * 610 * Note that this is done regardless of Active Persist across 611 * Target PowerLoss (APTPL) 612 * 613 * See spc4r17 section 6.3.12 READ_KEYS service action 614 */ 615 spin_lock(&dev->dev_reservation_lock); 616 prg = dev->t10_pr.pr_generation++; 617 spin_unlock(&dev->dev_reservation_lock); 618 619 return prg; 620 } 621 622 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 623 struct se_device *dev, 624 struct se_node_acl *nacl, 625 struct se_lun *lun, 626 struct se_dev_entry *dest_deve, 627 u64 mapped_lun, 628 unsigned char *isid, 629 u64 sa_res_key, 630 int all_tg_pt, 631 int aptpl) 632 { 633 struct t10_pr_registration *pr_reg; 634 635 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 636 if (!pr_reg) { 637 pr_err("Unable to allocate struct t10_pr_registration\n"); 638 return NULL; 639 } 640 641 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 642 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 643 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 644 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 645 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 646 atomic_set(&pr_reg->pr_res_holders, 0); 647 pr_reg->pr_reg_nacl = nacl; 648 /* 649 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 650 * the se_dev_entry->pr_ref will have been already obtained by 651 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 652 * 653 * Otherwise, locate se_dev_entry now and obtain a reference until 654 * registration completes in __core_scsi3_add_registration(). 655 */ 656 if (dest_deve) { 657 pr_reg->pr_reg_deve = dest_deve; 658 } else { 659 rcu_read_lock(); 660 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 661 if (!pr_reg->pr_reg_deve) { 662 rcu_read_unlock(); 663 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 664 nacl->initiatorname, mapped_lun); 665 kmem_cache_free(t10_pr_reg_cache, pr_reg); 666 return NULL; 667 } 668 kref_get(&pr_reg->pr_reg_deve->pr_kref); 669 rcu_read_unlock(); 670 } 671 pr_reg->pr_res_mapped_lun = mapped_lun; 672 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 673 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 674 pr_reg->pr_res_key = sa_res_key; 675 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 676 pr_reg->pr_reg_aptpl = aptpl; 677 /* 678 * If an ISID value for this SCSI Initiator Port exists, 679 * save it to the registration now. 680 */ 681 if (isid != NULL) { 682 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 683 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 684 pr_reg->isid_present_at_reg = 1; 685 } 686 687 return pr_reg; 688 } 689 690 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 691 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 692 693 /* 694 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 695 * modes. 696 */ 697 static struct t10_pr_registration *__core_scsi3_alloc_registration( 698 struct se_device *dev, 699 struct se_node_acl *nacl, 700 struct se_lun *lun, 701 struct se_dev_entry *deve, 702 u64 mapped_lun, 703 unsigned char *isid, 704 u64 sa_res_key, 705 int all_tg_pt, 706 int aptpl) 707 { 708 struct se_dev_entry *deve_tmp; 709 struct se_node_acl *nacl_tmp; 710 struct se_lun_acl *lacl_tmp; 711 struct se_lun *lun_tmp, *next, *dest_lun; 712 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 713 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 714 int ret; 715 /* 716 * Create a registration for the I_T Nexus upon which the 717 * PROUT REGISTER was received. 718 */ 719 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 720 isid, sa_res_key, all_tg_pt, 721 aptpl); 722 if (!pr_reg) 723 return NULL; 724 /* 725 * Return pointer to pr_reg for ALL_TG_PT=0 726 */ 727 if (!all_tg_pt) 728 return pr_reg; 729 /* 730 * Create list of matching SCSI Initiator Port registrations 731 * for ALL_TG_PT=1 732 */ 733 spin_lock(&dev->se_port_lock); 734 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 735 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 736 continue; 737 spin_unlock(&dev->se_port_lock); 738 739 spin_lock(&lun_tmp->lun_deve_lock); 740 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 741 /* 742 * This pointer will be NULL for demo mode MappedLUNs 743 * that have not been make explicit via a ConfigFS 744 * MappedLUN group for the SCSI Initiator Node ACL. 745 */ 746 if (!deve_tmp->se_lun_acl) 747 continue; 748 749 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 750 lockdep_is_held(&lun_tmp->lun_deve_lock)); 751 nacl_tmp = lacl_tmp->se_lun_nacl; 752 /* 753 * Skip the matching struct se_node_acl that is allocated 754 * above.. 755 */ 756 if (nacl == nacl_tmp) 757 continue; 758 /* 759 * Only perform PR registrations for target ports on 760 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 761 * arrived. 762 */ 763 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 764 continue; 765 /* 766 * Look for a matching Initiator Node ACL in ASCII format 767 */ 768 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 769 continue; 770 771 kref_get(&deve_tmp->pr_kref); 772 spin_unlock(&lun_tmp->lun_deve_lock); 773 /* 774 * Grab a configfs group dependency that is released 775 * for the exception path at label out: below, or upon 776 * completion of adding ALL_TG_PT=1 registrations in 777 * __core_scsi3_add_registration() 778 */ 779 ret = core_scsi3_lunacl_depend_item(deve_tmp); 780 if (ret < 0) { 781 pr_err("core_scsi3_lunacl_depend" 782 "_item() failed\n"); 783 percpu_ref_put(&lun_tmp->lun_ref); 784 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 785 goto out; 786 } 787 /* 788 * Located a matching SCSI Initiator Port on a different 789 * port, allocate the pr_reg_atp and attach it to the 790 * pr_reg->pr_reg_atp_list that will be processed once 791 * the original *pr_reg is processed in 792 * __core_scsi3_add_registration() 793 */ 794 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 795 kref_read(&deve_tmp->pr_kref) != 0); 796 797 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 798 nacl_tmp, dest_lun, deve_tmp, 799 deve_tmp->mapped_lun, NULL, 800 sa_res_key, all_tg_pt, aptpl); 801 if (!pr_reg_atp) { 802 percpu_ref_put(&lun_tmp->lun_ref); 803 core_scsi3_lunacl_undepend_item(deve_tmp); 804 goto out; 805 } 806 807 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 808 &pr_reg->pr_reg_atp_list); 809 spin_lock(&lun_tmp->lun_deve_lock); 810 } 811 spin_unlock(&lun_tmp->lun_deve_lock); 812 813 spin_lock(&dev->se_port_lock); 814 percpu_ref_put(&lun_tmp->lun_ref); 815 } 816 spin_unlock(&dev->se_port_lock); 817 818 return pr_reg; 819 out: 820 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 821 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 822 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 823 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 824 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 825 } 826 kmem_cache_free(t10_pr_reg_cache, pr_reg); 827 return NULL; 828 } 829 830 int core_scsi3_alloc_aptpl_registration( 831 struct t10_reservation *pr_tmpl, 832 u64 sa_res_key, 833 unsigned char *i_port, 834 unsigned char *isid, 835 u64 mapped_lun, 836 unsigned char *t_port, 837 u16 tpgt, 838 u64 target_lun, 839 int res_holder, 840 int all_tg_pt, 841 u8 type) 842 { 843 struct t10_pr_registration *pr_reg; 844 845 if (!i_port || !t_port || !sa_res_key) { 846 pr_err("Illegal parameters for APTPL registration\n"); 847 return -EINVAL; 848 } 849 850 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 851 if (!pr_reg) { 852 pr_err("Unable to allocate struct t10_pr_registration\n"); 853 return -ENOMEM; 854 } 855 856 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 857 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 858 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 859 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 860 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 861 atomic_set(&pr_reg->pr_res_holders, 0); 862 pr_reg->pr_reg_nacl = NULL; 863 pr_reg->pr_reg_deve = NULL; 864 pr_reg->pr_res_mapped_lun = mapped_lun; 865 pr_reg->pr_aptpl_target_lun = target_lun; 866 pr_reg->pr_res_key = sa_res_key; 867 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 868 pr_reg->pr_reg_aptpl = 1; 869 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 870 pr_reg->pr_res_type = type; 871 /* 872 * If an ISID value had been saved in APTPL metadata for this 873 * SCSI Initiator Port, restore it now. 874 */ 875 if (isid != NULL) { 876 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 877 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 878 pr_reg->isid_present_at_reg = 1; 879 } 880 /* 881 * Copy the i_port and t_port information from caller. 882 */ 883 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 884 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 885 pr_reg->pr_reg_tpgt = tpgt; 886 /* 887 * Set pr_res_holder from caller, the pr_reg who is the reservation 888 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 889 * the Initiator Node LUN ACL from the fabric module is created for 890 * this registration. 891 */ 892 pr_reg->pr_res_holder = res_holder; 893 894 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 895 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 896 " metadata\n", (res_holder) ? "+reservation" : ""); 897 return 0; 898 } 899 900 static void core_scsi3_aptpl_reserve( 901 struct se_device *dev, 902 struct se_portal_group *tpg, 903 struct se_node_acl *node_acl, 904 struct t10_pr_registration *pr_reg) 905 { 906 char i_buf[PR_REG_ISID_ID_LEN]; 907 908 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 909 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 910 911 spin_lock(&dev->dev_reservation_lock); 912 dev->dev_pr_res_holder = pr_reg; 913 spin_unlock(&dev->dev_reservation_lock); 914 915 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 916 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 917 tpg->se_tpg_tfo->get_fabric_name(), 918 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 919 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 920 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 921 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 922 i_buf); 923 } 924 925 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 926 struct t10_pr_registration *, enum register_type, int); 927 928 static int __core_scsi3_check_aptpl_registration( 929 struct se_device *dev, 930 struct se_portal_group *tpg, 931 struct se_lun *lun, 932 u64 target_lun, 933 struct se_node_acl *nacl, 934 u64 mapped_lun) 935 { 936 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 937 struct t10_reservation *pr_tmpl = &dev->t10_pr; 938 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 939 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 940 u16 tpgt; 941 942 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 943 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 944 /* 945 * Copy Initiator Port information from struct se_node_acl 946 */ 947 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 948 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 949 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 950 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 951 /* 952 * Look for the matching registrations+reservation from those 953 * created from APTPL metadata. Note that multiple registrations 954 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 955 * TransportIDs. 956 */ 957 spin_lock(&pr_tmpl->aptpl_reg_lock); 958 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 959 pr_reg_aptpl_list) { 960 961 if (!strcmp(pr_reg->pr_iport, i_port) && 962 (pr_reg->pr_res_mapped_lun == mapped_lun) && 963 !(strcmp(pr_reg->pr_tport, t_port)) && 964 (pr_reg->pr_reg_tpgt == tpgt) && 965 (pr_reg->pr_aptpl_target_lun == target_lun)) { 966 /* 967 * Obtain the ->pr_reg_deve pointer + reference, that 968 * is released by __core_scsi3_add_registration() below. 969 */ 970 rcu_read_lock(); 971 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 972 if (!pr_reg->pr_reg_deve) { 973 pr_err("Unable to locate PR APTPL %s mapped_lun:" 974 " %llu\n", nacl->initiatorname, mapped_lun); 975 rcu_read_unlock(); 976 continue; 977 } 978 kref_get(&pr_reg->pr_reg_deve->pr_kref); 979 rcu_read_unlock(); 980 981 pr_reg->pr_reg_nacl = nacl; 982 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 983 list_del(&pr_reg->pr_reg_aptpl_list); 984 spin_unlock(&pr_tmpl->aptpl_reg_lock); 985 /* 986 * At this point all of the pointers in *pr_reg will 987 * be setup, so go ahead and add the registration. 988 */ 989 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 990 /* 991 * If this registration is the reservation holder, 992 * make that happen now.. 993 */ 994 if (pr_reg->pr_res_holder) 995 core_scsi3_aptpl_reserve(dev, tpg, 996 nacl, pr_reg); 997 /* 998 * Reenable pr_aptpl_active to accept new metadata 999 * updates once the SCSI device is active again.. 1000 */ 1001 spin_lock(&pr_tmpl->aptpl_reg_lock); 1002 pr_tmpl->pr_aptpl_active = 1; 1003 } 1004 } 1005 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1006 1007 return 0; 1008 } 1009 1010 int core_scsi3_check_aptpl_registration( 1011 struct se_device *dev, 1012 struct se_portal_group *tpg, 1013 struct se_lun *lun, 1014 struct se_node_acl *nacl, 1015 u64 mapped_lun) 1016 { 1017 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1018 return 0; 1019 1020 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1021 lun->unpacked_lun, nacl, 1022 mapped_lun); 1023 } 1024 1025 static void __core_scsi3_dump_registration( 1026 const struct target_core_fabric_ops *tfo, 1027 struct se_device *dev, 1028 struct se_node_acl *nacl, 1029 struct t10_pr_registration *pr_reg, 1030 enum register_type register_type) 1031 { 1032 struct se_portal_group *se_tpg = nacl->se_tpg; 1033 char i_buf[PR_REG_ISID_ID_LEN]; 1034 1035 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1036 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1037 1038 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1039 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1040 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1041 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1042 i_buf); 1043 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1044 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1045 tfo->tpg_get_tag(se_tpg)); 1046 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1047 " Port(s)\n", tfo->get_fabric_name(), 1048 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1049 dev->transport->name); 1050 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1051 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1052 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1053 pr_reg->pr_reg_aptpl); 1054 } 1055 1056 static void __core_scsi3_add_registration( 1057 struct se_device *dev, 1058 struct se_node_acl *nacl, 1059 struct t10_pr_registration *pr_reg, 1060 enum register_type register_type, 1061 int register_move) 1062 { 1063 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1064 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1065 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1066 struct se_dev_entry *deve; 1067 1068 /* 1069 * Increment PRgeneration counter for struct se_device upon a successful 1070 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1071 * 1072 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1073 * action, the struct se_device->dev_reservation_lock will already be held, 1074 * so we do not call core_scsi3_pr_generation() which grabs the lock 1075 * for the REGISTER. 1076 */ 1077 pr_reg->pr_res_generation = (register_move) ? 1078 dev->t10_pr.pr_generation++ : 1079 core_scsi3_pr_generation(dev); 1080 1081 spin_lock(&pr_tmpl->registration_lock); 1082 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1083 1084 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1085 spin_unlock(&pr_tmpl->registration_lock); 1086 /* 1087 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1088 */ 1089 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1090 goto out; 1091 /* 1092 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1093 * allocated in __core_scsi3_alloc_registration() 1094 */ 1095 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1096 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1097 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1098 1099 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1100 1101 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1102 1103 spin_lock(&pr_tmpl->registration_lock); 1104 list_add_tail(&pr_reg_tmp->pr_reg_list, 1105 &pr_tmpl->registration_list); 1106 1107 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1108 register_type); 1109 spin_unlock(&pr_tmpl->registration_lock); 1110 /* 1111 * Drop configfs group dependency reference and deve->pr_kref 1112 * obtained from __core_scsi3_alloc_registration() code. 1113 */ 1114 rcu_read_lock(); 1115 deve = pr_reg_tmp->pr_reg_deve; 1116 if (deve) { 1117 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1118 core_scsi3_lunacl_undepend_item(deve); 1119 pr_reg_tmp->pr_reg_deve = NULL; 1120 } 1121 rcu_read_unlock(); 1122 } 1123 out: 1124 /* 1125 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1126 */ 1127 rcu_read_lock(); 1128 deve = pr_reg->pr_reg_deve; 1129 if (deve) { 1130 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1131 kref_put(&deve->pr_kref, target_pr_kref_release); 1132 pr_reg->pr_reg_deve = NULL; 1133 } 1134 rcu_read_unlock(); 1135 } 1136 1137 static int core_scsi3_alloc_registration( 1138 struct se_device *dev, 1139 struct se_node_acl *nacl, 1140 struct se_lun *lun, 1141 struct se_dev_entry *deve, 1142 u64 mapped_lun, 1143 unsigned char *isid, 1144 u64 sa_res_key, 1145 int all_tg_pt, 1146 int aptpl, 1147 enum register_type register_type, 1148 int register_move) 1149 { 1150 struct t10_pr_registration *pr_reg; 1151 1152 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1153 isid, sa_res_key, all_tg_pt, 1154 aptpl); 1155 if (!pr_reg) 1156 return -EPERM; 1157 1158 __core_scsi3_add_registration(dev, nacl, pr_reg, 1159 register_type, register_move); 1160 return 0; 1161 } 1162 1163 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1164 struct se_device *dev, 1165 struct se_node_acl *nacl, 1166 unsigned char *isid) 1167 { 1168 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1169 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1170 struct se_portal_group *tpg; 1171 1172 spin_lock(&pr_tmpl->registration_lock); 1173 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1174 &pr_tmpl->registration_list, pr_reg_list) { 1175 /* 1176 * First look for a matching struct se_node_acl 1177 */ 1178 if (pr_reg->pr_reg_nacl != nacl) 1179 continue; 1180 1181 tpg = pr_reg->pr_reg_nacl->se_tpg; 1182 /* 1183 * If this registration does NOT contain a fabric provided 1184 * ISID, then we have found a match. 1185 */ 1186 if (!pr_reg->isid_present_at_reg) { 1187 /* 1188 * Determine if this SCSI device server requires that 1189 * SCSI Intiatior TransportID w/ ISIDs is enforced 1190 * for fabric modules (iSCSI) requiring them. 1191 */ 1192 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1193 if (dev->dev_attrib.enforce_pr_isids) 1194 continue; 1195 } 1196 atomic_inc_mb(&pr_reg->pr_res_holders); 1197 spin_unlock(&pr_tmpl->registration_lock); 1198 return pr_reg; 1199 } 1200 /* 1201 * If the *pr_reg contains a fabric defined ISID for multi-value 1202 * SCSI Initiator Port TransportIDs, then we expect a valid 1203 * matching ISID to be provided by the local SCSI Initiator Port. 1204 */ 1205 if (!isid) 1206 continue; 1207 if (strcmp(isid, pr_reg->pr_reg_isid)) 1208 continue; 1209 1210 atomic_inc_mb(&pr_reg->pr_res_holders); 1211 spin_unlock(&pr_tmpl->registration_lock); 1212 return pr_reg; 1213 } 1214 spin_unlock(&pr_tmpl->registration_lock); 1215 1216 return NULL; 1217 } 1218 1219 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1220 struct se_device *dev, 1221 struct se_node_acl *nacl, 1222 struct se_session *sess) 1223 { 1224 struct se_portal_group *tpg = nacl->se_tpg; 1225 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1226 1227 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1228 memset(&buf[0], 0, PR_REG_ISID_LEN); 1229 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1230 PR_REG_ISID_LEN); 1231 isid_ptr = &buf[0]; 1232 } 1233 1234 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1235 } 1236 1237 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1238 { 1239 atomic_dec_mb(&pr_reg->pr_res_holders); 1240 } 1241 1242 static int core_scsi3_check_implicit_release( 1243 struct se_device *dev, 1244 struct t10_pr_registration *pr_reg) 1245 { 1246 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1247 struct t10_pr_registration *pr_res_holder; 1248 int ret = 0; 1249 1250 spin_lock(&dev->dev_reservation_lock); 1251 pr_res_holder = dev->dev_pr_res_holder; 1252 if (!pr_res_holder) { 1253 spin_unlock(&dev->dev_reservation_lock); 1254 return ret; 1255 } 1256 if (pr_res_holder == pr_reg) { 1257 /* 1258 * Perform an implicit RELEASE if the registration that 1259 * is being released is holding the reservation. 1260 * 1261 * From spc4r17, section 5.7.11.1: 1262 * 1263 * e) If the I_T nexus is the persistent reservation holder 1264 * and the persistent reservation is not an all registrants 1265 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1266 * service action or REGISTER AND IGNORE EXISTING KEY 1267 * service action with the SERVICE ACTION RESERVATION KEY 1268 * field set to zero (see 5.7.11.3). 1269 */ 1270 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1271 ret = 1; 1272 /* 1273 * For 'All Registrants' reservation types, all existing 1274 * registrations are still processed as reservation holders 1275 * in core_scsi3_pr_seq_non_holder() after the initial 1276 * reservation holder is implicitly released here. 1277 */ 1278 } else if (pr_reg->pr_reg_all_tg_pt && 1279 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1280 pr_reg->pr_reg_nacl->initiatorname)) && 1281 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1282 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1283 " UNREGISTER while existing reservation with matching" 1284 " key 0x%016Lx is present from another SCSI Initiator" 1285 " Port\n", pr_reg->pr_res_key); 1286 ret = -EPERM; 1287 } 1288 spin_unlock(&dev->dev_reservation_lock); 1289 1290 return ret; 1291 } 1292 1293 /* 1294 * Called with struct t10_reservation->registration_lock held. 1295 */ 1296 static void __core_scsi3_free_registration( 1297 struct se_device *dev, 1298 struct t10_pr_registration *pr_reg, 1299 struct list_head *preempt_and_abort_list, 1300 int dec_holders) 1301 __releases(&pr_tmpl->registration_lock) 1302 __acquires(&pr_tmpl->registration_lock) 1303 { 1304 const struct target_core_fabric_ops *tfo = 1305 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1306 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1307 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1308 struct se_dev_entry *deve; 1309 char i_buf[PR_REG_ISID_ID_LEN]; 1310 1311 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1312 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1313 1314 if (!list_empty(&pr_reg->pr_reg_list)) 1315 list_del(&pr_reg->pr_reg_list); 1316 /* 1317 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1318 * so call core_scsi3_put_pr_reg() to decrement our reference. 1319 */ 1320 if (dec_holders) 1321 core_scsi3_put_pr_reg(pr_reg); 1322 1323 spin_unlock(&pr_tmpl->registration_lock); 1324 /* 1325 * Wait until all reference from any other I_T nexuses for this 1326 * *pr_reg have been released. Because list_del() is called above, 1327 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1328 * count back to zero, and we release *pr_reg. 1329 */ 1330 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1331 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1332 tfo->get_fabric_name()); 1333 cpu_relax(); 1334 } 1335 1336 rcu_read_lock(); 1337 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1338 if (deve) 1339 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1340 rcu_read_unlock(); 1341 1342 spin_lock(&pr_tmpl->registration_lock); 1343 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1344 " Node: %s%s\n", tfo->get_fabric_name(), 1345 pr_reg->pr_reg_nacl->initiatorname, 1346 i_buf); 1347 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1348 " Port(s)\n", tfo->get_fabric_name(), 1349 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1350 dev->transport->name); 1351 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1352 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1353 pr_reg->pr_res_generation); 1354 1355 if (!preempt_and_abort_list) { 1356 pr_reg->pr_reg_deve = NULL; 1357 pr_reg->pr_reg_nacl = NULL; 1358 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1359 return; 1360 } 1361 /* 1362 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1363 * are released once the ABORT_TASK_SET has completed.. 1364 */ 1365 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1366 } 1367 1368 void core_scsi3_free_pr_reg_from_nacl( 1369 struct se_device *dev, 1370 struct se_node_acl *nacl) 1371 { 1372 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1373 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1374 bool free_reg = false; 1375 /* 1376 * If the passed se_node_acl matches the reservation holder, 1377 * release the reservation. 1378 */ 1379 spin_lock(&dev->dev_reservation_lock); 1380 pr_res_holder = dev->dev_pr_res_holder; 1381 if ((pr_res_holder != NULL) && 1382 (pr_res_holder->pr_reg_nacl == nacl)) { 1383 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1384 free_reg = true; 1385 } 1386 spin_unlock(&dev->dev_reservation_lock); 1387 /* 1388 * Release any registration associated with the struct se_node_acl. 1389 */ 1390 spin_lock(&pr_tmpl->registration_lock); 1391 if (pr_res_holder && free_reg) 1392 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1393 1394 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1395 &pr_tmpl->registration_list, pr_reg_list) { 1396 1397 if (pr_reg->pr_reg_nacl != nacl) 1398 continue; 1399 1400 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1401 } 1402 spin_unlock(&pr_tmpl->registration_lock); 1403 } 1404 1405 void core_scsi3_free_all_registrations( 1406 struct se_device *dev) 1407 { 1408 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1409 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1410 1411 spin_lock(&dev->dev_reservation_lock); 1412 pr_res_holder = dev->dev_pr_res_holder; 1413 if (pr_res_holder != NULL) { 1414 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1415 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1416 pr_res_holder, 0, 0); 1417 } 1418 spin_unlock(&dev->dev_reservation_lock); 1419 1420 spin_lock(&pr_tmpl->registration_lock); 1421 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1422 &pr_tmpl->registration_list, pr_reg_list) { 1423 1424 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1425 } 1426 spin_unlock(&pr_tmpl->registration_lock); 1427 1428 spin_lock(&pr_tmpl->aptpl_reg_lock); 1429 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1430 pr_reg_aptpl_list) { 1431 list_del(&pr_reg->pr_reg_aptpl_list); 1432 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1433 } 1434 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1435 } 1436 1437 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1438 { 1439 return target_depend_item(&tpg->tpg_group.cg_item); 1440 } 1441 1442 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1443 { 1444 target_undepend_item(&tpg->tpg_group.cg_item); 1445 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1446 } 1447 1448 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1449 { 1450 if (nacl->dynamic_node_acl) 1451 return 0; 1452 return target_depend_item(&nacl->acl_group.cg_item); 1453 } 1454 1455 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1456 { 1457 if (!nacl->dynamic_node_acl) 1458 target_undepend_item(&nacl->acl_group.cg_item); 1459 atomic_dec_mb(&nacl->acl_pr_ref_count); 1460 } 1461 1462 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1463 { 1464 struct se_lun_acl *lun_acl; 1465 1466 /* 1467 * For nacl->dynamic_node_acl=1 1468 */ 1469 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1470 kref_read(&se_deve->pr_kref) != 0); 1471 if (!lun_acl) 1472 return 0; 1473 1474 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1475 } 1476 1477 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1478 { 1479 struct se_lun_acl *lun_acl; 1480 1481 /* 1482 * For nacl->dynamic_node_acl=1 1483 */ 1484 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1485 kref_read(&se_deve->pr_kref) != 0); 1486 if (!lun_acl) { 1487 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1488 return; 1489 } 1490 1491 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1492 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1493 } 1494 1495 static sense_reason_t 1496 core_scsi3_decode_spec_i_port( 1497 struct se_cmd *cmd, 1498 struct se_portal_group *tpg, 1499 unsigned char *l_isid, 1500 u64 sa_res_key, 1501 int all_tg_pt, 1502 int aptpl) 1503 { 1504 struct se_device *dev = cmd->se_dev; 1505 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1506 struct se_session *se_sess = cmd->se_sess; 1507 struct se_node_acl *dest_node_acl = NULL; 1508 struct se_dev_entry *dest_se_deve = NULL; 1509 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1510 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1511 LIST_HEAD(tid_dest_list); 1512 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1513 unsigned char *buf, *ptr, proto_ident; 1514 const unsigned char *i_str = NULL; 1515 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1516 sense_reason_t ret; 1517 u32 tpdl, tid_len = 0; 1518 u32 dest_rtpi = 0; 1519 1520 /* 1521 * Allocate a struct pr_transport_id_holder and setup the 1522 * local_node_acl pointer and add to struct list_head tid_dest_list 1523 * for add registration processing in the loop of tid_dest_list below. 1524 */ 1525 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1526 if (!tidh_new) { 1527 pr_err("Unable to allocate tidh_new\n"); 1528 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1529 } 1530 INIT_LIST_HEAD(&tidh_new->dest_list); 1531 tidh_new->dest_tpg = tpg; 1532 tidh_new->dest_node_acl = se_sess->se_node_acl; 1533 1534 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1535 se_sess->se_node_acl, cmd->se_lun, 1536 NULL, cmd->orig_fe_lun, l_isid, 1537 sa_res_key, all_tg_pt, aptpl); 1538 if (!local_pr_reg) { 1539 kfree(tidh_new); 1540 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1541 } 1542 tidh_new->dest_pr_reg = local_pr_reg; 1543 /* 1544 * The local I_T nexus does not hold any configfs dependances, 1545 * so we set tidh_new->dest_se_deve to NULL to prevent the 1546 * configfs_undepend_item() calls in the tid_dest_list loops below. 1547 */ 1548 tidh_new->dest_se_deve = NULL; 1549 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1550 1551 if (cmd->data_length < 28) { 1552 pr_warn("SPC-PR: Received PR OUT parameter list" 1553 " length too small: %u\n", cmd->data_length); 1554 ret = TCM_INVALID_PARAMETER_LIST; 1555 goto out; 1556 } 1557 1558 buf = transport_kmap_data_sg(cmd); 1559 if (!buf) { 1560 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1561 goto out; 1562 } 1563 1564 /* 1565 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1566 * first extract TransportID Parameter Data Length, and make sure 1567 * the value matches up to the SCSI expected data transfer length. 1568 */ 1569 tpdl = get_unaligned_be32(&buf[24]); 1570 1571 if ((tpdl + 28) != cmd->data_length) { 1572 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1573 " does not equal CDB data_length: %u\n", tpdl, 1574 cmd->data_length); 1575 ret = TCM_INVALID_PARAMETER_LIST; 1576 goto out_unmap; 1577 } 1578 /* 1579 * Start processing the received transport IDs using the 1580 * receiving I_T Nexus portal's fabric dependent methods to 1581 * obtain the SCSI Initiator Port/Device Identifiers. 1582 */ 1583 ptr = &buf[28]; 1584 1585 while (tpdl > 0) { 1586 struct se_lun *dest_lun, *tmp_lun; 1587 1588 proto_ident = (ptr[0] & 0x0f); 1589 dest_tpg = NULL; 1590 1591 spin_lock(&dev->se_port_lock); 1592 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1593 tmp_tpg = tmp_lun->lun_tpg; 1594 1595 /* 1596 * Look for the matching proto_ident provided by 1597 * the received TransportID 1598 */ 1599 if (tmp_tpg->proto_id != proto_ident) 1600 continue; 1601 dest_rtpi = tmp_lun->lun_rtpi; 1602 1603 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1604 ptr, &tid_len, &iport_ptr); 1605 if (!i_str) 1606 continue; 1607 1608 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1609 spin_unlock(&dev->se_port_lock); 1610 1611 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1612 pr_err(" core_scsi3_tpg_depend_item()" 1613 " for tmp_tpg\n"); 1614 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1615 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1616 goto out_unmap; 1617 } 1618 /* 1619 * Locate the destination initiator ACL to be registered 1620 * from the decoded fabric module specific TransportID 1621 * at *i_str. 1622 */ 1623 mutex_lock(&tmp_tpg->acl_node_mutex); 1624 dest_node_acl = __core_tpg_get_initiator_node_acl( 1625 tmp_tpg, i_str); 1626 if (dest_node_acl) 1627 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1628 mutex_unlock(&tmp_tpg->acl_node_mutex); 1629 1630 if (!dest_node_acl) { 1631 core_scsi3_tpg_undepend_item(tmp_tpg); 1632 spin_lock(&dev->se_port_lock); 1633 continue; 1634 } 1635 1636 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1637 pr_err("configfs_depend_item() failed" 1638 " for dest_node_acl->acl_group\n"); 1639 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1640 core_scsi3_tpg_undepend_item(tmp_tpg); 1641 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1642 goto out_unmap; 1643 } 1644 1645 dest_tpg = tmp_tpg; 1646 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1647 " %s Port RTPI: %hu\n", 1648 dest_tpg->se_tpg_tfo->get_fabric_name(), 1649 dest_node_acl->initiatorname, dest_rtpi); 1650 1651 spin_lock(&dev->se_port_lock); 1652 break; 1653 } 1654 spin_unlock(&dev->se_port_lock); 1655 1656 if (!dest_tpg) { 1657 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1658 " dest_tpg\n"); 1659 ret = TCM_INVALID_PARAMETER_LIST; 1660 goto out_unmap; 1661 } 1662 1663 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1664 " tid_len: %d for %s + %s\n", 1665 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1666 tpdl, tid_len, i_str, iport_ptr); 1667 1668 if (tid_len > tpdl) { 1669 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1670 " %u for Transport ID: %s\n", tid_len, ptr); 1671 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1672 core_scsi3_tpg_undepend_item(dest_tpg); 1673 ret = TCM_INVALID_PARAMETER_LIST; 1674 goto out_unmap; 1675 } 1676 /* 1677 * Locate the desintation struct se_dev_entry pointer for matching 1678 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1679 * Target Port. 1680 */ 1681 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1682 dest_rtpi); 1683 if (!dest_se_deve) { 1684 pr_err("Unable to locate %s dest_se_deve" 1685 " from destination RTPI: %hu\n", 1686 dest_tpg->se_tpg_tfo->get_fabric_name(), 1687 dest_rtpi); 1688 1689 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1690 core_scsi3_tpg_undepend_item(dest_tpg); 1691 ret = TCM_INVALID_PARAMETER_LIST; 1692 goto out_unmap; 1693 } 1694 1695 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1696 pr_err("core_scsi3_lunacl_depend_item()" 1697 " failed\n"); 1698 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1699 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1700 core_scsi3_tpg_undepend_item(dest_tpg); 1701 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1702 goto out_unmap; 1703 } 1704 1705 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1706 " dest_se_deve mapped_lun: %llu\n", 1707 dest_tpg->se_tpg_tfo->get_fabric_name(), 1708 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1709 1710 /* 1711 * Skip any TransportIDs that already have a registration for 1712 * this target port. 1713 */ 1714 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1715 iport_ptr); 1716 if (pr_reg_e) { 1717 core_scsi3_put_pr_reg(pr_reg_e); 1718 core_scsi3_lunacl_undepend_item(dest_se_deve); 1719 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1720 core_scsi3_tpg_undepend_item(dest_tpg); 1721 ptr += tid_len; 1722 tpdl -= tid_len; 1723 tid_len = 0; 1724 continue; 1725 } 1726 /* 1727 * Allocate a struct pr_transport_id_holder and setup 1728 * the dest_node_acl and dest_se_deve pointers for the 1729 * loop below. 1730 */ 1731 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1732 GFP_KERNEL); 1733 if (!tidh_new) { 1734 pr_err("Unable to allocate tidh_new\n"); 1735 core_scsi3_lunacl_undepend_item(dest_se_deve); 1736 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1737 core_scsi3_tpg_undepend_item(dest_tpg); 1738 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1739 goto out_unmap; 1740 } 1741 INIT_LIST_HEAD(&tidh_new->dest_list); 1742 tidh_new->dest_tpg = dest_tpg; 1743 tidh_new->dest_node_acl = dest_node_acl; 1744 tidh_new->dest_se_deve = dest_se_deve; 1745 1746 /* 1747 * Allocate, but do NOT add the registration for the 1748 * TransportID referenced SCSI Initiator port. This 1749 * done because of the following from spc4r17 in section 1750 * 6.14.3 wrt SPEC_I_PT: 1751 * 1752 * "If a registration fails for any initiator port (e.g., if th 1753 * logical unit does not have enough resources available to 1754 * hold the registration information), no registrations shall be 1755 * made, and the command shall be terminated with 1756 * CHECK CONDITION status." 1757 * 1758 * That means we call __core_scsi3_alloc_registration() here, 1759 * and then call __core_scsi3_add_registration() in the 1760 * 2nd loop which will never fail. 1761 */ 1762 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1763 kref_read(&dest_se_deve->pr_kref) != 0); 1764 1765 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1766 dest_node_acl, dest_lun, dest_se_deve, 1767 dest_se_deve->mapped_lun, iport_ptr, 1768 sa_res_key, all_tg_pt, aptpl); 1769 if (!dest_pr_reg) { 1770 core_scsi3_lunacl_undepend_item(dest_se_deve); 1771 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1772 core_scsi3_tpg_undepend_item(dest_tpg); 1773 kfree(tidh_new); 1774 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1775 goto out_unmap; 1776 } 1777 tidh_new->dest_pr_reg = dest_pr_reg; 1778 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1779 1780 ptr += tid_len; 1781 tpdl -= tid_len; 1782 tid_len = 0; 1783 1784 } 1785 1786 transport_kunmap_data_sg(cmd); 1787 1788 /* 1789 * Go ahead and create a registrations from tid_dest_list for the 1790 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1791 * and dest_se_deve. 1792 * 1793 * The SA Reservation Key from the PROUT is set for the 1794 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1795 * means that the TransportID Initiator port will be 1796 * registered on all of the target ports in the SCSI target device 1797 * ALL_TG_PT=0 means the registration will only be for the 1798 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1799 * was received. 1800 */ 1801 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1802 dest_tpg = tidh->dest_tpg; 1803 dest_node_acl = tidh->dest_node_acl; 1804 dest_se_deve = tidh->dest_se_deve; 1805 dest_pr_reg = tidh->dest_pr_reg; 1806 1807 list_del(&tidh->dest_list); 1808 kfree(tidh); 1809 1810 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1811 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1812 1813 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1814 dest_pr_reg, 0, 0); 1815 1816 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1817 " registered Transport ID for Node: %s%s Mapped LUN:" 1818 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1819 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1820 dest_se_deve->mapped_lun : 0); 1821 1822 if (!dest_se_deve) { 1823 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1824 target_pr_kref_release); 1825 continue; 1826 } 1827 core_scsi3_lunacl_undepend_item(dest_se_deve); 1828 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1829 core_scsi3_tpg_undepend_item(dest_tpg); 1830 } 1831 1832 return 0; 1833 out_unmap: 1834 transport_kunmap_data_sg(cmd); 1835 out: 1836 /* 1837 * For the failure case, release everything from tid_dest_list 1838 * including *dest_pr_reg and the configfs dependances.. 1839 */ 1840 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1841 dest_tpg = tidh->dest_tpg; 1842 dest_node_acl = tidh->dest_node_acl; 1843 dest_se_deve = tidh->dest_se_deve; 1844 dest_pr_reg = tidh->dest_pr_reg; 1845 1846 list_del(&tidh->dest_list); 1847 kfree(tidh); 1848 /* 1849 * Release any extra ALL_TG_PT=1 registrations for 1850 * the SPEC_I_PT=1 case. 1851 */ 1852 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1853 &dest_pr_reg->pr_reg_atp_list, 1854 pr_reg_atp_mem_list) { 1855 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1856 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1857 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1858 } 1859 1860 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1861 1862 if (!dest_se_deve) { 1863 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1864 target_pr_kref_release); 1865 continue; 1866 } 1867 core_scsi3_lunacl_undepend_item(dest_se_deve); 1868 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1869 core_scsi3_tpg_undepend_item(dest_tpg); 1870 } 1871 return ret; 1872 } 1873 1874 static int core_scsi3_update_aptpl_buf( 1875 struct se_device *dev, 1876 unsigned char *buf, 1877 u32 pr_aptpl_buf_len) 1878 { 1879 struct se_portal_group *tpg; 1880 struct t10_pr_registration *pr_reg; 1881 unsigned char tmp[512], isid_buf[32]; 1882 ssize_t len = 0; 1883 int reg_count = 0; 1884 int ret = 0; 1885 1886 spin_lock(&dev->dev_reservation_lock); 1887 spin_lock(&dev->t10_pr.registration_lock); 1888 /* 1889 * Walk the registration list.. 1890 */ 1891 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1892 pr_reg_list) { 1893 1894 tmp[0] = '\0'; 1895 isid_buf[0] = '\0'; 1896 tpg = pr_reg->pr_reg_nacl->se_tpg; 1897 /* 1898 * Write out any ISID value to APTPL metadata that was included 1899 * in the original registration. 1900 */ 1901 if (pr_reg->isid_present_at_reg) 1902 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1903 pr_reg->pr_reg_isid); 1904 /* 1905 * Include special metadata if the pr_reg matches the 1906 * reservation holder. 1907 */ 1908 if (dev->dev_pr_res_holder == pr_reg) { 1909 snprintf(tmp, 512, "PR_REG_START: %d" 1910 "\ninitiator_fabric=%s\n" 1911 "initiator_node=%s\n%s" 1912 "sa_res_key=%llu\n" 1913 "res_holder=1\nres_type=%02x\n" 1914 "res_scope=%02x\nres_all_tg_pt=%d\n" 1915 "mapped_lun=%llu\n", reg_count, 1916 tpg->se_tpg_tfo->get_fabric_name(), 1917 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1918 pr_reg->pr_res_key, pr_reg->pr_res_type, 1919 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1920 pr_reg->pr_res_mapped_lun); 1921 } else { 1922 snprintf(tmp, 512, "PR_REG_START: %d\n" 1923 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1924 "sa_res_key=%llu\nres_holder=0\n" 1925 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1926 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1927 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1928 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1929 pr_reg->pr_res_mapped_lun); 1930 } 1931 1932 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1933 pr_err("Unable to update renaming APTPL metadata," 1934 " reallocating larger buffer\n"); 1935 ret = -EMSGSIZE; 1936 goto out; 1937 } 1938 len += sprintf(buf+len, "%s", tmp); 1939 1940 /* 1941 * Include information about the associated SCSI target port. 1942 */ 1943 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1944 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1945 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1946 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1947 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1948 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1949 reg_count); 1950 1951 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1952 pr_err("Unable to update renaming APTPL metadata," 1953 " reallocating larger buffer\n"); 1954 ret = -EMSGSIZE; 1955 goto out; 1956 } 1957 len += sprintf(buf+len, "%s", tmp); 1958 reg_count++; 1959 } 1960 1961 if (!reg_count) 1962 len += sprintf(buf+len, "No Registrations or Reservations"); 1963 1964 out: 1965 spin_unlock(&dev->t10_pr.registration_lock); 1966 spin_unlock(&dev->dev_reservation_lock); 1967 1968 return ret; 1969 } 1970 1971 static int __core_scsi3_write_aptpl_to_file( 1972 struct se_device *dev, 1973 unsigned char *buf) 1974 { 1975 struct t10_wwn *wwn = &dev->t10_wwn; 1976 struct file *file; 1977 int flags = O_RDWR | O_CREAT | O_TRUNC; 1978 char *path; 1979 u32 pr_aptpl_buf_len; 1980 int ret; 1981 loff_t pos = 0; 1982 1983 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1984 &wwn->unit_serial[0]); 1985 if (!path) 1986 return -ENOMEM; 1987 1988 file = filp_open(path, flags, 0600); 1989 if (IS_ERR(file)) { 1990 pr_err("filp_open(%s) for APTPL metadata" 1991 " failed\n", path); 1992 kfree(path); 1993 return PTR_ERR(file); 1994 } 1995 1996 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1997 1998 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1999 2000 if (ret < 0) 2001 pr_debug("Error writing APTPL metadata file: %s\n", path); 2002 fput(file); 2003 kfree(path); 2004 2005 return (ret < 0) ? -EIO : 0; 2006 } 2007 2008 /* 2009 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2010 * write out the updated metadata to struct file for this SCSI device. 2011 */ 2012 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2013 { 2014 unsigned char *buf; 2015 int rc, len = PR_APTPL_BUF_LEN; 2016 2017 if (!aptpl) { 2018 char *null_buf = "No Registrations or Reservations\n"; 2019 2020 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2021 dev->t10_pr.pr_aptpl_active = 0; 2022 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2023 2024 if (rc) 2025 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2026 2027 return 0; 2028 } 2029 retry: 2030 buf = vzalloc(len); 2031 if (!buf) 2032 return TCM_OUT_OF_RESOURCES; 2033 2034 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2035 if (rc < 0) { 2036 vfree(buf); 2037 len *= 2; 2038 goto retry; 2039 } 2040 2041 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2042 if (rc != 0) { 2043 pr_err("SPC-3 PR: Could not update APTPL\n"); 2044 vfree(buf); 2045 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2046 } 2047 dev->t10_pr.pr_aptpl_active = 1; 2048 vfree(buf); 2049 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2050 return 0; 2051 } 2052 2053 static sense_reason_t 2054 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2055 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2056 { 2057 struct se_session *se_sess = cmd->se_sess; 2058 struct se_device *dev = cmd->se_dev; 2059 struct se_lun *se_lun = cmd->se_lun; 2060 struct se_portal_group *se_tpg; 2061 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2062 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2063 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2064 sense_reason_t ret = TCM_NO_SENSE; 2065 int pr_holder = 0, type; 2066 2067 if (!se_sess || !se_lun) { 2068 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2069 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2070 } 2071 se_tpg = se_sess->se_tpg; 2072 2073 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2074 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2075 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2076 PR_REG_ISID_LEN); 2077 isid_ptr = &isid_buf[0]; 2078 } 2079 /* 2080 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2081 */ 2082 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2083 if (!pr_reg) { 2084 if (res_key) { 2085 pr_warn("SPC-3 PR: Reservation Key non-zero" 2086 " for SA REGISTER, returning CONFLICT\n"); 2087 return TCM_RESERVATION_CONFLICT; 2088 } 2089 /* 2090 * Do nothing but return GOOD status. 2091 */ 2092 if (!sa_res_key) 2093 return 0; 2094 2095 if (!spec_i_pt) { 2096 /* 2097 * Perform the Service Action REGISTER on the Initiator 2098 * Port Endpoint that the PRO was received from on the 2099 * Logical Unit of the SCSI device server. 2100 */ 2101 if (core_scsi3_alloc_registration(cmd->se_dev, 2102 se_sess->se_node_acl, cmd->se_lun, 2103 NULL, cmd->orig_fe_lun, isid_ptr, 2104 sa_res_key, all_tg_pt, aptpl, 2105 register_type, 0)) { 2106 pr_err("Unable to allocate" 2107 " struct t10_pr_registration\n"); 2108 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2109 } 2110 } else { 2111 /* 2112 * Register both the Initiator port that received 2113 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2114 * TransportID from Parameter list and loop through 2115 * fabric dependent parameter list while calling 2116 * logic from of core_scsi3_alloc_registration() for 2117 * each TransportID provided SCSI Initiator Port/Device 2118 */ 2119 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2120 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2121 if (ret != 0) 2122 return ret; 2123 } 2124 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2125 } 2126 2127 /* ok, existing registration */ 2128 2129 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2130 pr_err("SPC-3 PR REGISTER: Received" 2131 " res_key: 0x%016Lx does not match" 2132 " existing SA REGISTER res_key:" 2133 " 0x%016Lx\n", res_key, 2134 pr_reg->pr_res_key); 2135 ret = TCM_RESERVATION_CONFLICT; 2136 goto out; 2137 } 2138 2139 if (spec_i_pt) { 2140 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2141 " set on a registered nexus\n"); 2142 ret = TCM_INVALID_PARAMETER_LIST; 2143 goto out; 2144 } 2145 2146 /* 2147 * An existing ALL_TG_PT=1 registration being released 2148 * must also set ALL_TG_PT=1 in the incoming PROUT. 2149 */ 2150 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2151 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2152 " registration exists, but ALL_TG_PT=1 bit not" 2153 " present in received PROUT\n"); 2154 ret = TCM_INVALID_CDB_FIELD; 2155 goto out; 2156 } 2157 2158 /* 2159 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2160 */ 2161 if (sa_res_key) { 2162 /* 2163 * Increment PRgeneration counter for struct se_device" 2164 * upon a successful REGISTER, see spc4r17 section 6.3.2 2165 * READ_KEYS service action. 2166 */ 2167 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2168 pr_reg->pr_res_key = sa_res_key; 2169 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2170 " Key for %s to: 0x%016Lx PRgeneration:" 2171 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2172 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2173 pr_reg->pr_reg_nacl->initiatorname, 2174 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2175 2176 } else { 2177 /* 2178 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2179 */ 2180 type = pr_reg->pr_res_type; 2181 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2182 pr_reg); 2183 if (pr_holder < 0) { 2184 ret = TCM_RESERVATION_CONFLICT; 2185 goto out; 2186 } 2187 2188 spin_lock(&pr_tmpl->registration_lock); 2189 /* 2190 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2191 * and matching pr_res_key. 2192 */ 2193 if (pr_reg->pr_reg_all_tg_pt) { 2194 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2195 &pr_tmpl->registration_list, 2196 pr_reg_list) { 2197 2198 if (!pr_reg_p->pr_reg_all_tg_pt) 2199 continue; 2200 if (pr_reg_p->pr_res_key != res_key) 2201 continue; 2202 if (pr_reg == pr_reg_p) 2203 continue; 2204 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2205 pr_reg_p->pr_reg_nacl->initiatorname)) 2206 continue; 2207 2208 __core_scsi3_free_registration(dev, 2209 pr_reg_p, NULL, 0); 2210 } 2211 } 2212 2213 /* 2214 * Release the calling I_T Nexus registration now.. 2215 */ 2216 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2217 pr_reg = NULL; 2218 2219 /* 2220 * From spc4r17, section 5.7.11.3 Unregistering 2221 * 2222 * If the persistent reservation is a registrants only 2223 * type, the device server shall establish a unit 2224 * attention condition for the initiator port associated 2225 * with every registered I_T nexus except for the I_T 2226 * nexus on which the PERSISTENT RESERVE OUT command was 2227 * received, with the additional sense code set to 2228 * RESERVATIONS RELEASED. 2229 */ 2230 if (pr_holder && 2231 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2232 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2233 list_for_each_entry(pr_reg_p, 2234 &pr_tmpl->registration_list, 2235 pr_reg_list) { 2236 2237 target_ua_allocate_lun( 2238 pr_reg_p->pr_reg_nacl, 2239 pr_reg_p->pr_res_mapped_lun, 2240 0x2A, 2241 ASCQ_2AH_RESERVATIONS_RELEASED); 2242 } 2243 } 2244 2245 spin_unlock(&pr_tmpl->registration_lock); 2246 } 2247 2248 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2249 2250 out: 2251 if (pr_reg) 2252 core_scsi3_put_pr_reg(pr_reg); 2253 return ret; 2254 } 2255 2256 unsigned char *core_scsi3_pr_dump_type(int type) 2257 { 2258 switch (type) { 2259 case PR_TYPE_WRITE_EXCLUSIVE: 2260 return "Write Exclusive Access"; 2261 case PR_TYPE_EXCLUSIVE_ACCESS: 2262 return "Exclusive Access"; 2263 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2264 return "Write Exclusive Access, Registrants Only"; 2265 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2266 return "Exclusive Access, Registrants Only"; 2267 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2268 return "Write Exclusive Access, All Registrants"; 2269 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2270 return "Exclusive Access, All Registrants"; 2271 default: 2272 break; 2273 } 2274 2275 return "Unknown SPC-3 PR Type"; 2276 } 2277 2278 static sense_reason_t 2279 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2280 { 2281 struct se_device *dev = cmd->se_dev; 2282 struct se_session *se_sess = cmd->se_sess; 2283 struct se_lun *se_lun = cmd->se_lun; 2284 struct t10_pr_registration *pr_reg, *pr_res_holder; 2285 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2286 char i_buf[PR_REG_ISID_ID_LEN]; 2287 sense_reason_t ret; 2288 2289 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2290 2291 if (!se_sess || !se_lun) { 2292 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2293 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2294 } 2295 /* 2296 * Locate the existing *pr_reg via struct se_node_acl pointers 2297 */ 2298 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2299 se_sess); 2300 if (!pr_reg) { 2301 pr_err("SPC-3 PR: Unable to locate" 2302 " PR_REGISTERED *pr_reg for RESERVE\n"); 2303 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2304 } 2305 /* 2306 * From spc4r17 Section 5.7.9: Reserving: 2307 * 2308 * An application client creates a persistent reservation by issuing 2309 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2310 * a registered I_T nexus with the following parameters: 2311 * a) RESERVATION KEY set to the value of the reservation key that is 2312 * registered with the logical unit for the I_T nexus; and 2313 */ 2314 if (res_key != pr_reg->pr_res_key) { 2315 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2316 " does not match existing SA REGISTER res_key:" 2317 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2318 ret = TCM_RESERVATION_CONFLICT; 2319 goto out_put_pr_reg; 2320 } 2321 /* 2322 * From spc4r17 Section 5.7.9: Reserving: 2323 * 2324 * From above: 2325 * b) TYPE field and SCOPE field set to the persistent reservation 2326 * being created. 2327 * 2328 * Only one persistent reservation is allowed at a time per logical unit 2329 * and that persistent reservation has a scope of LU_SCOPE. 2330 */ 2331 if (scope != PR_SCOPE_LU_SCOPE) { 2332 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2333 ret = TCM_INVALID_PARAMETER_LIST; 2334 goto out_put_pr_reg; 2335 } 2336 /* 2337 * See if we have an existing PR reservation holder pointer at 2338 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2339 * *pr_res_holder. 2340 */ 2341 spin_lock(&dev->dev_reservation_lock); 2342 pr_res_holder = dev->dev_pr_res_holder; 2343 if (pr_res_holder) { 2344 /* 2345 * From spc4r17 Section 5.7.9: Reserving: 2346 * 2347 * If the device server receives a PERSISTENT RESERVE OUT 2348 * command from an I_T nexus other than a persistent reservation 2349 * holder (see 5.7.10) that attempts to create a persistent 2350 * reservation when a persistent reservation already exists for 2351 * the logical unit, then the command shall be completed with 2352 * RESERVATION CONFLICT status. 2353 */ 2354 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2355 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2356 pr_err("SPC-3 PR: Attempted RESERVE from" 2357 " [%s]: %s while reservation already held by" 2358 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2359 cmd->se_tfo->get_fabric_name(), 2360 se_sess->se_node_acl->initiatorname, 2361 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2362 pr_res_holder->pr_reg_nacl->initiatorname); 2363 2364 spin_unlock(&dev->dev_reservation_lock); 2365 ret = TCM_RESERVATION_CONFLICT; 2366 goto out_put_pr_reg; 2367 } 2368 /* 2369 * From spc4r17 Section 5.7.9: Reserving: 2370 * 2371 * If a persistent reservation holder attempts to modify the 2372 * type or scope of an existing persistent reservation, the 2373 * command shall be completed with RESERVATION CONFLICT status. 2374 */ 2375 if ((pr_res_holder->pr_res_type != type) || 2376 (pr_res_holder->pr_res_scope != scope)) { 2377 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2378 pr_err("SPC-3 PR: Attempted RESERVE from" 2379 " [%s]: %s trying to change TYPE and/or SCOPE," 2380 " while reservation already held by [%s]: %s," 2381 " returning RESERVATION_CONFLICT\n", 2382 cmd->se_tfo->get_fabric_name(), 2383 se_sess->se_node_acl->initiatorname, 2384 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2385 pr_res_holder->pr_reg_nacl->initiatorname); 2386 2387 spin_unlock(&dev->dev_reservation_lock); 2388 ret = TCM_RESERVATION_CONFLICT; 2389 goto out_put_pr_reg; 2390 } 2391 /* 2392 * From spc4r17 Section 5.7.9: Reserving: 2393 * 2394 * If the device server receives a PERSISTENT RESERVE OUT 2395 * command with RESERVE service action where the TYPE field and 2396 * the SCOPE field contain the same values as the existing type 2397 * and scope from a persistent reservation holder, it shall not 2398 * make any change to the existing persistent reservation and 2399 * shall completethe command with GOOD status. 2400 */ 2401 spin_unlock(&dev->dev_reservation_lock); 2402 ret = 0; 2403 goto out_put_pr_reg; 2404 } 2405 /* 2406 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2407 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2408 */ 2409 pr_reg->pr_res_scope = scope; 2410 pr_reg->pr_res_type = type; 2411 pr_reg->pr_res_holder = 1; 2412 dev->dev_pr_res_holder = pr_reg; 2413 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2414 2415 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2416 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2417 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2418 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2419 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2420 cmd->se_tfo->get_fabric_name(), 2421 se_sess->se_node_acl->initiatorname, 2422 i_buf); 2423 spin_unlock(&dev->dev_reservation_lock); 2424 2425 if (pr_tmpl->pr_aptpl_active) 2426 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2427 2428 ret = 0; 2429 out_put_pr_reg: 2430 core_scsi3_put_pr_reg(pr_reg); 2431 return ret; 2432 } 2433 2434 static sense_reason_t 2435 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2436 u64 res_key) 2437 { 2438 switch (type) { 2439 case PR_TYPE_WRITE_EXCLUSIVE: 2440 case PR_TYPE_EXCLUSIVE_ACCESS: 2441 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2442 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2443 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2444 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2445 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2446 default: 2447 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2448 " 0x%02x\n", type); 2449 return TCM_INVALID_CDB_FIELD; 2450 } 2451 } 2452 2453 /* 2454 * Called with struct se_device->dev_reservation_lock held. 2455 */ 2456 static void __core_scsi3_complete_pro_release( 2457 struct se_device *dev, 2458 struct se_node_acl *se_nacl, 2459 struct t10_pr_registration *pr_reg, 2460 int explicit, 2461 int unreg) 2462 { 2463 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2464 char i_buf[PR_REG_ISID_ID_LEN]; 2465 int pr_res_type = 0, pr_res_scope = 0; 2466 2467 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2468 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2469 /* 2470 * Go ahead and release the current PR reservation holder. 2471 * If an All Registrants reservation is currently active and 2472 * a unregister operation is requested, replace the current 2473 * dev_pr_res_holder with another active registration. 2474 */ 2475 if (dev->dev_pr_res_holder) { 2476 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2477 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2478 dev->dev_pr_res_holder->pr_res_type = 0; 2479 dev->dev_pr_res_holder->pr_res_scope = 0; 2480 dev->dev_pr_res_holder->pr_res_holder = 0; 2481 dev->dev_pr_res_holder = NULL; 2482 } 2483 if (!unreg) 2484 goto out; 2485 2486 spin_lock(&dev->t10_pr.registration_lock); 2487 list_del_init(&pr_reg->pr_reg_list); 2488 /* 2489 * If the I_T nexus is a reservation holder, the persistent reservation 2490 * is of an all registrants type, and the I_T nexus is the last remaining 2491 * registered I_T nexus, then the device server shall also release the 2492 * persistent reservation. 2493 */ 2494 if (!list_empty(&dev->t10_pr.registration_list) && 2495 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2496 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2497 dev->dev_pr_res_holder = 2498 list_entry(dev->t10_pr.registration_list.next, 2499 struct t10_pr_registration, pr_reg_list); 2500 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2501 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2502 dev->dev_pr_res_holder->pr_res_holder = 1; 2503 } 2504 spin_unlock(&dev->t10_pr.registration_lock); 2505 out: 2506 if (!dev->dev_pr_res_holder) { 2507 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2508 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2509 tfo->get_fabric_name(), (explicit) ? "explicit" : 2510 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2511 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2512 } 2513 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2514 tfo->get_fabric_name(), se_nacl->initiatorname, 2515 i_buf); 2516 /* 2517 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2518 */ 2519 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2520 } 2521 2522 static sense_reason_t 2523 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2524 u64 res_key) 2525 { 2526 struct se_device *dev = cmd->se_dev; 2527 struct se_session *se_sess = cmd->se_sess; 2528 struct se_lun *se_lun = cmd->se_lun; 2529 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2530 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2531 sense_reason_t ret = 0; 2532 2533 if (!se_sess || !se_lun) { 2534 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2535 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2536 } 2537 /* 2538 * Locate the existing *pr_reg via struct se_node_acl pointers 2539 */ 2540 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2541 if (!pr_reg) { 2542 pr_err("SPC-3 PR: Unable to locate" 2543 " PR_REGISTERED *pr_reg for RELEASE\n"); 2544 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2545 } 2546 /* 2547 * From spc4r17 Section 5.7.11.2 Releasing: 2548 * 2549 * If there is no persistent reservation or in response to a persistent 2550 * reservation release request from a registered I_T nexus that is not a 2551 * persistent reservation holder (see 5.7.10), the device server shall 2552 * do the following: 2553 * 2554 * a) Not release the persistent reservation, if any; 2555 * b) Not remove any registrations; and 2556 * c) Complete the command with GOOD status. 2557 */ 2558 spin_lock(&dev->dev_reservation_lock); 2559 pr_res_holder = dev->dev_pr_res_holder; 2560 if (!pr_res_holder) { 2561 /* 2562 * No persistent reservation, return GOOD status. 2563 */ 2564 spin_unlock(&dev->dev_reservation_lock); 2565 goto out_put_pr_reg; 2566 } 2567 2568 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2569 /* 2570 * Release request from a registered I_T nexus that is not a 2571 * persistent reservation holder. return GOOD status. 2572 */ 2573 spin_unlock(&dev->dev_reservation_lock); 2574 goto out_put_pr_reg; 2575 } 2576 2577 /* 2578 * From spc4r17 Section 5.7.11.2 Releasing: 2579 * 2580 * Only the persistent reservation holder (see 5.7.10) is allowed to 2581 * release a persistent reservation. 2582 * 2583 * An application client releases the persistent reservation by issuing 2584 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2585 * an I_T nexus that is a persistent reservation holder with the 2586 * following parameters: 2587 * 2588 * a) RESERVATION KEY field set to the value of the reservation key 2589 * that is registered with the logical unit for the I_T nexus; 2590 */ 2591 if (res_key != pr_reg->pr_res_key) { 2592 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2593 " does not match existing SA REGISTER res_key:" 2594 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2595 spin_unlock(&dev->dev_reservation_lock); 2596 ret = TCM_RESERVATION_CONFLICT; 2597 goto out_put_pr_reg; 2598 } 2599 /* 2600 * From spc4r17 Section 5.7.11.2 Releasing and above: 2601 * 2602 * b) TYPE field and SCOPE field set to match the persistent 2603 * reservation being released. 2604 */ 2605 if ((pr_res_holder->pr_res_type != type) || 2606 (pr_res_holder->pr_res_scope != scope)) { 2607 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2608 pr_err("SPC-3 PR RELEASE: Attempted to release" 2609 " reservation from [%s]: %s with different TYPE " 2610 "and/or SCOPE while reservation already held by" 2611 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2612 cmd->se_tfo->get_fabric_name(), 2613 se_sess->se_node_acl->initiatorname, 2614 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2615 pr_res_holder->pr_reg_nacl->initiatorname); 2616 2617 spin_unlock(&dev->dev_reservation_lock); 2618 ret = TCM_RESERVATION_CONFLICT; 2619 goto out_put_pr_reg; 2620 } 2621 /* 2622 * In response to a persistent reservation release request from the 2623 * persistent reservation holder the device server shall perform a 2624 * release by doing the following as an uninterrupted series of actions: 2625 * a) Release the persistent reservation; 2626 * b) Not remove any registration(s); 2627 * c) If the released persistent reservation is a registrants only type 2628 * or all registrants type persistent reservation, 2629 * the device server shall establish a unit attention condition for 2630 * the initiator port associated with every regis- 2631 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2632 * RESERVE OUT command with RELEASE service action was received, 2633 * with the additional sense code set to RESERVATIONS RELEASED; and 2634 * d) If the persistent reservation is of any other type, the device 2635 * server shall not establish a unit attention condition. 2636 */ 2637 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2638 pr_reg, 1, 0); 2639 2640 spin_unlock(&dev->dev_reservation_lock); 2641 2642 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2643 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2644 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2645 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2646 /* 2647 * If no UNIT ATTENTION conditions will be established for 2648 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2649 * go ahead and check for APTPL=1 update+write below 2650 */ 2651 goto write_aptpl; 2652 } 2653 2654 spin_lock(&pr_tmpl->registration_lock); 2655 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2656 pr_reg_list) { 2657 /* 2658 * Do not establish a UNIT ATTENTION condition 2659 * for the calling I_T Nexus 2660 */ 2661 if (pr_reg_p == pr_reg) 2662 continue; 2663 2664 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2665 pr_reg_p->pr_res_mapped_lun, 2666 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2667 } 2668 spin_unlock(&pr_tmpl->registration_lock); 2669 2670 write_aptpl: 2671 if (pr_tmpl->pr_aptpl_active) 2672 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2673 2674 out_put_pr_reg: 2675 core_scsi3_put_pr_reg(pr_reg); 2676 return ret; 2677 } 2678 2679 static sense_reason_t 2680 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2681 { 2682 struct se_device *dev = cmd->se_dev; 2683 struct se_node_acl *pr_reg_nacl; 2684 struct se_session *se_sess = cmd->se_sess; 2685 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2686 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2687 u64 pr_res_mapped_lun = 0; 2688 int calling_it_nexus = 0; 2689 /* 2690 * Locate the existing *pr_reg via struct se_node_acl pointers 2691 */ 2692 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2693 se_sess->se_node_acl, se_sess); 2694 if (!pr_reg_n) { 2695 pr_err("SPC-3 PR: Unable to locate" 2696 " PR_REGISTERED *pr_reg for CLEAR\n"); 2697 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2698 } 2699 /* 2700 * From spc4r17 section 5.7.11.6, Clearing: 2701 * 2702 * Any application client may release the persistent reservation and 2703 * remove all registrations from a device server by issuing a 2704 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2705 * registered I_T nexus with the following parameter: 2706 * 2707 * a) RESERVATION KEY field set to the value of the reservation key 2708 * that is registered with the logical unit for the I_T nexus. 2709 */ 2710 if (res_key != pr_reg_n->pr_res_key) { 2711 pr_err("SPC-3 PR REGISTER: Received" 2712 " res_key: 0x%016Lx does not match" 2713 " existing SA REGISTER res_key:" 2714 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2715 core_scsi3_put_pr_reg(pr_reg_n); 2716 return TCM_RESERVATION_CONFLICT; 2717 } 2718 /* 2719 * a) Release the persistent reservation, if any; 2720 */ 2721 spin_lock(&dev->dev_reservation_lock); 2722 pr_res_holder = dev->dev_pr_res_holder; 2723 if (pr_res_holder) { 2724 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2725 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2726 pr_res_holder, 0, 0); 2727 } 2728 spin_unlock(&dev->dev_reservation_lock); 2729 /* 2730 * b) Remove all registration(s) (see spc4r17 5.7.7); 2731 */ 2732 spin_lock(&pr_tmpl->registration_lock); 2733 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2734 &pr_tmpl->registration_list, pr_reg_list) { 2735 2736 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2737 pr_reg_nacl = pr_reg->pr_reg_nacl; 2738 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2739 __core_scsi3_free_registration(dev, pr_reg, NULL, 2740 calling_it_nexus); 2741 /* 2742 * e) Establish a unit attention condition for the initiator 2743 * port associated with every registered I_T nexus other 2744 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2745 * command with CLEAR service action was received, with the 2746 * additional sense code set to RESERVATIONS PREEMPTED. 2747 */ 2748 if (!calling_it_nexus) 2749 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2750 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2751 } 2752 spin_unlock(&pr_tmpl->registration_lock); 2753 2754 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2755 cmd->se_tfo->get_fabric_name()); 2756 2757 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2758 2759 core_scsi3_pr_generation(dev); 2760 return 0; 2761 } 2762 2763 /* 2764 * Called with struct se_device->dev_reservation_lock held. 2765 */ 2766 static void __core_scsi3_complete_pro_preempt( 2767 struct se_device *dev, 2768 struct t10_pr_registration *pr_reg, 2769 struct list_head *preempt_and_abort_list, 2770 int type, 2771 int scope, 2772 enum preempt_type preempt_type) 2773 { 2774 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2775 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2776 char i_buf[PR_REG_ISID_ID_LEN]; 2777 2778 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2779 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2780 /* 2781 * Do an implicit RELEASE of the existing reservation. 2782 */ 2783 if (dev->dev_pr_res_holder) 2784 __core_scsi3_complete_pro_release(dev, nacl, 2785 dev->dev_pr_res_holder, 0, 0); 2786 2787 dev->dev_pr_res_holder = pr_reg; 2788 pr_reg->pr_res_holder = 1; 2789 pr_reg->pr_res_type = type; 2790 pr_reg->pr_res_scope = scope; 2791 2792 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2793 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2794 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2795 core_scsi3_pr_dump_type(type), 2796 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2797 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2798 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2799 nacl->initiatorname, i_buf); 2800 /* 2801 * For PREEMPT_AND_ABORT, add the preempting reservation's 2802 * struct t10_pr_registration to the list that will be compared 2803 * against received CDBs.. 2804 */ 2805 if (preempt_and_abort_list) 2806 list_add_tail(&pr_reg->pr_reg_abort_list, 2807 preempt_and_abort_list); 2808 } 2809 2810 static void core_scsi3_release_preempt_and_abort( 2811 struct list_head *preempt_and_abort_list, 2812 struct t10_pr_registration *pr_reg_holder) 2813 { 2814 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2815 2816 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2817 pr_reg_abort_list) { 2818 2819 list_del(&pr_reg->pr_reg_abort_list); 2820 if (pr_reg_holder == pr_reg) 2821 continue; 2822 if (pr_reg->pr_res_holder) { 2823 pr_warn("pr_reg->pr_res_holder still set\n"); 2824 continue; 2825 } 2826 2827 pr_reg->pr_reg_deve = NULL; 2828 pr_reg->pr_reg_nacl = NULL; 2829 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2830 } 2831 } 2832 2833 static sense_reason_t 2834 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2835 u64 sa_res_key, enum preempt_type preempt_type) 2836 { 2837 struct se_device *dev = cmd->se_dev; 2838 struct se_node_acl *pr_reg_nacl; 2839 struct se_session *se_sess = cmd->se_sess; 2840 LIST_HEAD(preempt_and_abort_list); 2841 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2842 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2843 u64 pr_res_mapped_lun = 0; 2844 int all_reg = 0, calling_it_nexus = 0; 2845 bool sa_res_key_unmatched = sa_res_key != 0; 2846 int prh_type = 0, prh_scope = 0; 2847 2848 if (!se_sess) 2849 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2850 2851 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2852 se_sess); 2853 if (!pr_reg_n) { 2854 pr_err("SPC-3 PR: Unable to locate" 2855 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2856 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2857 return TCM_RESERVATION_CONFLICT; 2858 } 2859 if (pr_reg_n->pr_res_key != res_key) { 2860 core_scsi3_put_pr_reg(pr_reg_n); 2861 return TCM_RESERVATION_CONFLICT; 2862 } 2863 if (scope != PR_SCOPE_LU_SCOPE) { 2864 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2865 core_scsi3_put_pr_reg(pr_reg_n); 2866 return TCM_INVALID_PARAMETER_LIST; 2867 } 2868 2869 spin_lock(&dev->dev_reservation_lock); 2870 pr_res_holder = dev->dev_pr_res_holder; 2871 if (pr_res_holder && 2872 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2873 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2874 all_reg = 1; 2875 2876 if (!all_reg && !sa_res_key) { 2877 spin_unlock(&dev->dev_reservation_lock); 2878 core_scsi3_put_pr_reg(pr_reg_n); 2879 return TCM_INVALID_PARAMETER_LIST; 2880 } 2881 /* 2882 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2883 * 2884 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2885 * persistent reservation holder or there is no persistent reservation 2886 * holder (i.e., there is no persistent reservation), then the device 2887 * server shall perform a preempt by doing the following in an 2888 * uninterrupted series of actions. (See below..) 2889 */ 2890 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2891 /* 2892 * No existing or SA Reservation Key matching reservations.. 2893 * 2894 * PROUT SA PREEMPT with All Registrant type reservations are 2895 * allowed to be processed without a matching SA Reservation Key 2896 */ 2897 spin_lock(&pr_tmpl->registration_lock); 2898 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2899 &pr_tmpl->registration_list, pr_reg_list) { 2900 /* 2901 * Removing of registrations in non all registrants 2902 * type reservations without a matching SA reservation 2903 * key. 2904 * 2905 * a) Remove the registrations for all I_T nexuses 2906 * specified by the SERVICE ACTION RESERVATION KEY 2907 * field; 2908 * b) Ignore the contents of the SCOPE and TYPE fields; 2909 * c) Process tasks as defined in 5.7.1; and 2910 * d) Establish a unit attention condition for the 2911 * initiator port associated with every I_T nexus 2912 * that lost its registration other than the I_T 2913 * nexus on which the PERSISTENT RESERVE OUT command 2914 * was received, with the additional sense code set 2915 * to REGISTRATIONS PREEMPTED. 2916 */ 2917 if (!all_reg) { 2918 if (pr_reg->pr_res_key != sa_res_key) 2919 continue; 2920 sa_res_key_unmatched = false; 2921 2922 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2923 pr_reg_nacl = pr_reg->pr_reg_nacl; 2924 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2925 __core_scsi3_free_registration(dev, pr_reg, 2926 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2927 NULL, calling_it_nexus); 2928 } else { 2929 /* 2930 * Case for any existing all registrants type 2931 * reservation, follow logic in spc4r17 section 2932 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2933 * 2934 * For a ZERO SA Reservation key, release 2935 * all other registrations and do an implicit 2936 * release of active persistent reservation. 2937 * 2938 * For a non-ZERO SA Reservation key, only 2939 * release the matching reservation key from 2940 * registrations. 2941 */ 2942 if ((sa_res_key) && 2943 (pr_reg->pr_res_key != sa_res_key)) 2944 continue; 2945 sa_res_key_unmatched = false; 2946 2947 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2948 if (calling_it_nexus) 2949 continue; 2950 2951 pr_reg_nacl = pr_reg->pr_reg_nacl; 2952 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2953 __core_scsi3_free_registration(dev, pr_reg, 2954 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2955 NULL, 0); 2956 } 2957 if (!calling_it_nexus) 2958 target_ua_allocate_lun(pr_reg_nacl, 2959 pr_res_mapped_lun, 0x2A, 2960 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2961 } 2962 spin_unlock(&pr_tmpl->registration_lock); 2963 /* 2964 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2965 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2966 * RESERVATION KEY field to a value that does not match any 2967 * registered reservation key, then the device server shall 2968 * complete the command with RESERVATION CONFLICT status. 2969 */ 2970 if (sa_res_key_unmatched) { 2971 spin_unlock(&dev->dev_reservation_lock); 2972 core_scsi3_put_pr_reg(pr_reg_n); 2973 return TCM_RESERVATION_CONFLICT; 2974 } 2975 /* 2976 * For an existing all registrants type reservation 2977 * with a zero SA rservation key, preempt the existing 2978 * reservation with the new PR type and scope. 2979 */ 2980 if (pr_res_holder && all_reg && !(sa_res_key)) { 2981 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2982 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2983 type, scope, preempt_type); 2984 2985 if (preempt_type == PREEMPT_AND_ABORT) 2986 core_scsi3_release_preempt_and_abort( 2987 &preempt_and_abort_list, pr_reg_n); 2988 } 2989 spin_unlock(&dev->dev_reservation_lock); 2990 2991 if (pr_tmpl->pr_aptpl_active) 2992 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2993 2994 core_scsi3_put_pr_reg(pr_reg_n); 2995 core_scsi3_pr_generation(cmd->se_dev); 2996 return 0; 2997 } 2998 /* 2999 * The PREEMPTing SA reservation key matches that of the 3000 * existing persistent reservation, first, we check if 3001 * we are preempting our own reservation. 3002 * From spc4r17, section 5.7.11.4.3 Preempting 3003 * persistent reservations and registration handling 3004 * 3005 * If an all registrants persistent reservation is not 3006 * present, it is not an error for the persistent 3007 * reservation holder to preempt itself (i.e., a 3008 * PERSISTENT RESERVE OUT with a PREEMPT service action 3009 * or a PREEMPT AND ABORT service action with the 3010 * SERVICE ACTION RESERVATION KEY value equal to the 3011 * persistent reservation holder's reservation key that 3012 * is received from the persistent reservation holder). 3013 * In that case, the device server shall establish the 3014 * new persistent reservation and maintain the 3015 * registration. 3016 */ 3017 prh_type = pr_res_holder->pr_res_type; 3018 prh_scope = pr_res_holder->pr_res_scope; 3019 /* 3020 * If the SERVICE ACTION RESERVATION KEY field identifies a 3021 * persistent reservation holder (see 5.7.10), the device 3022 * server shall perform a preempt by doing the following as 3023 * an uninterrupted series of actions: 3024 * 3025 * a) Release the persistent reservation for the holder 3026 * identified by the SERVICE ACTION RESERVATION KEY field; 3027 */ 3028 if (pr_reg_n != pr_res_holder) 3029 __core_scsi3_complete_pro_release(dev, 3030 pr_res_holder->pr_reg_nacl, 3031 dev->dev_pr_res_holder, 0, 0); 3032 /* 3033 * b) Remove the registrations for all I_T nexuses identified 3034 * by the SERVICE ACTION RESERVATION KEY field, except the 3035 * I_T nexus that is being used for the PERSISTENT RESERVE 3036 * OUT command. If an all registrants persistent reservation 3037 * is present and the SERVICE ACTION RESERVATION KEY field 3038 * is set to zero, then all registrations shall be removed 3039 * except for that of the I_T nexus that is being used for 3040 * the PERSISTENT RESERVE OUT command; 3041 */ 3042 spin_lock(&pr_tmpl->registration_lock); 3043 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3044 &pr_tmpl->registration_list, pr_reg_list) { 3045 3046 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3047 if (calling_it_nexus) 3048 continue; 3049 3050 if (pr_reg->pr_res_key != sa_res_key) 3051 continue; 3052 3053 pr_reg_nacl = pr_reg->pr_reg_nacl; 3054 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3055 __core_scsi3_free_registration(dev, pr_reg, 3056 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3057 calling_it_nexus); 3058 /* 3059 * e) Establish a unit attention condition for the initiator 3060 * port associated with every I_T nexus that lost its 3061 * persistent reservation and/or registration, with the 3062 * additional sense code set to REGISTRATIONS PREEMPTED; 3063 */ 3064 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3065 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3066 } 3067 spin_unlock(&pr_tmpl->registration_lock); 3068 /* 3069 * c) Establish a persistent reservation for the preempting 3070 * I_T nexus using the contents of the SCOPE and TYPE fields; 3071 */ 3072 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3073 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3074 type, scope, preempt_type); 3075 /* 3076 * d) Process tasks as defined in 5.7.1; 3077 * e) See above.. 3078 * f) If the type or scope has changed, then for every I_T nexus 3079 * whose reservation key was not removed, except for the I_T 3080 * nexus on which the PERSISTENT RESERVE OUT command was 3081 * received, the device server shall establish a unit 3082 * attention condition for the initiator port associated with 3083 * that I_T nexus, with the additional sense code set to 3084 * RESERVATIONS RELEASED. If the type or scope have not 3085 * changed, then no unit attention condition(s) shall be 3086 * established for this reason. 3087 */ 3088 if ((prh_type != type) || (prh_scope != scope)) { 3089 spin_lock(&pr_tmpl->registration_lock); 3090 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3091 &pr_tmpl->registration_list, pr_reg_list) { 3092 3093 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3094 if (calling_it_nexus) 3095 continue; 3096 3097 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3098 pr_reg->pr_res_mapped_lun, 0x2A, 3099 ASCQ_2AH_RESERVATIONS_RELEASED); 3100 } 3101 spin_unlock(&pr_tmpl->registration_lock); 3102 } 3103 spin_unlock(&dev->dev_reservation_lock); 3104 /* 3105 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3106 * All received CDBs for the matching existing reservation and 3107 * registrations undergo ABORT_TASK logic. 3108 * 3109 * From there, core_scsi3_release_preempt_and_abort() will 3110 * release every registration in the list (which have already 3111 * been removed from the primary pr_reg list), except the 3112 * new persistent reservation holder, the calling Initiator Port. 3113 */ 3114 if (preempt_type == PREEMPT_AND_ABORT) { 3115 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3116 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3117 pr_reg_n); 3118 } 3119 3120 if (pr_tmpl->pr_aptpl_active) 3121 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3122 3123 core_scsi3_put_pr_reg(pr_reg_n); 3124 core_scsi3_pr_generation(cmd->se_dev); 3125 return 0; 3126 } 3127 3128 static sense_reason_t 3129 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3130 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3131 { 3132 switch (type) { 3133 case PR_TYPE_WRITE_EXCLUSIVE: 3134 case PR_TYPE_EXCLUSIVE_ACCESS: 3135 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3136 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3137 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3138 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3139 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3140 sa_res_key, preempt_type); 3141 default: 3142 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3143 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3144 return TCM_INVALID_CDB_FIELD; 3145 } 3146 } 3147 3148 3149 static sense_reason_t 3150 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3151 u64 sa_res_key, int aptpl, int unreg) 3152 { 3153 struct se_session *se_sess = cmd->se_sess; 3154 struct se_device *dev = cmd->se_dev; 3155 struct se_dev_entry *dest_se_deve = NULL; 3156 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3157 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3158 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3159 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3160 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3161 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3162 unsigned char *buf; 3163 const unsigned char *initiator_str; 3164 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3165 u32 tid_len, tmp_tid_len; 3166 int new_reg = 0, type, scope, matching_iname; 3167 sense_reason_t ret; 3168 unsigned short rtpi; 3169 unsigned char proto_ident; 3170 3171 if (!se_sess || !se_lun) { 3172 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3173 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3174 } 3175 3176 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3177 se_tpg = se_sess->se_tpg; 3178 tf_ops = se_tpg->se_tpg_tfo; 3179 /* 3180 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3181 * Register behaviors for a REGISTER AND MOVE service action 3182 * 3183 * Locate the existing *pr_reg via struct se_node_acl pointers 3184 */ 3185 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3186 se_sess); 3187 if (!pr_reg) { 3188 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3189 " *pr_reg for REGISTER_AND_MOVE\n"); 3190 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3191 } 3192 /* 3193 * The provided reservation key much match the existing reservation key 3194 * provided during this initiator's I_T nexus registration. 3195 */ 3196 if (res_key != pr_reg->pr_res_key) { 3197 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3198 " res_key: 0x%016Lx does not match existing SA REGISTER" 3199 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3200 ret = TCM_RESERVATION_CONFLICT; 3201 goto out_put_pr_reg; 3202 } 3203 /* 3204 * The service active reservation key needs to be non zero 3205 */ 3206 if (!sa_res_key) { 3207 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3208 " sa_res_key\n"); 3209 ret = TCM_INVALID_PARAMETER_LIST; 3210 goto out_put_pr_reg; 3211 } 3212 3213 /* 3214 * Determine the Relative Target Port Identifier where the reservation 3215 * will be moved to for the TransportID containing SCSI initiator WWN 3216 * information. 3217 */ 3218 buf = transport_kmap_data_sg(cmd); 3219 if (!buf) { 3220 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3221 goto out_put_pr_reg; 3222 } 3223 3224 rtpi = get_unaligned_be16(&buf[18]); 3225 tid_len = get_unaligned_be32(&buf[20]); 3226 transport_kunmap_data_sg(cmd); 3227 buf = NULL; 3228 3229 if ((tid_len + 24) != cmd->data_length) { 3230 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3231 " does not equal CDB data_length: %u\n", tid_len, 3232 cmd->data_length); 3233 ret = TCM_INVALID_PARAMETER_LIST; 3234 goto out_put_pr_reg; 3235 } 3236 3237 spin_lock(&dev->se_port_lock); 3238 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3239 if (tmp_lun->lun_rtpi != rtpi) 3240 continue; 3241 dest_se_tpg = tmp_lun->lun_tpg; 3242 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3243 if (!dest_tf_ops) 3244 continue; 3245 3246 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3247 spin_unlock(&dev->se_port_lock); 3248 3249 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3250 pr_err("core_scsi3_tpg_depend_item() failed" 3251 " for dest_se_tpg\n"); 3252 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3253 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3254 goto out_put_pr_reg; 3255 } 3256 3257 spin_lock(&dev->se_port_lock); 3258 break; 3259 } 3260 spin_unlock(&dev->se_port_lock); 3261 3262 if (!dest_se_tpg || !dest_tf_ops) { 3263 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3264 " fabric ops from Relative Target Port Identifier:" 3265 " %hu\n", rtpi); 3266 ret = TCM_INVALID_PARAMETER_LIST; 3267 goto out_put_pr_reg; 3268 } 3269 3270 buf = transport_kmap_data_sg(cmd); 3271 if (!buf) { 3272 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3273 goto out_put_pr_reg; 3274 } 3275 proto_ident = (buf[24] & 0x0f); 3276 3277 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3278 " 0x%02x\n", proto_ident); 3279 3280 if (proto_ident != dest_se_tpg->proto_id) { 3281 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3282 " proto_ident: 0x%02x does not match ident: 0x%02x" 3283 " from fabric: %s\n", proto_ident, 3284 dest_se_tpg->proto_id, 3285 dest_tf_ops->get_fabric_name()); 3286 ret = TCM_INVALID_PARAMETER_LIST; 3287 goto out; 3288 } 3289 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3290 &buf[24], &tmp_tid_len, &iport_ptr); 3291 if (!initiator_str) { 3292 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3293 " initiator_str from Transport ID\n"); 3294 ret = TCM_INVALID_PARAMETER_LIST; 3295 goto out; 3296 } 3297 3298 transport_kunmap_data_sg(cmd); 3299 buf = NULL; 3300 3301 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3302 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3303 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3304 iport_ptr : ""); 3305 /* 3306 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3307 * action specifies a TransportID that is the same as the initiator port 3308 * of the I_T nexus for the command received, then the command shall 3309 * be terminated with CHECK CONDITION status, with the sense key set to 3310 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3311 * IN PARAMETER LIST. 3312 */ 3313 pr_reg_nacl = pr_reg->pr_reg_nacl; 3314 matching_iname = (!strcmp(initiator_str, 3315 pr_reg_nacl->initiatorname)) ? 1 : 0; 3316 if (!matching_iname) 3317 goto after_iport_check; 3318 3319 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3320 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3321 " matches: %s on received I_T Nexus\n", initiator_str, 3322 pr_reg_nacl->initiatorname); 3323 ret = TCM_INVALID_PARAMETER_LIST; 3324 goto out; 3325 } 3326 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3327 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3328 " matches: %s %s on received I_T Nexus\n", 3329 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3330 pr_reg->pr_reg_isid); 3331 ret = TCM_INVALID_PARAMETER_LIST; 3332 goto out; 3333 } 3334 after_iport_check: 3335 /* 3336 * Locate the destination struct se_node_acl from the received Transport ID 3337 */ 3338 mutex_lock(&dest_se_tpg->acl_node_mutex); 3339 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3340 initiator_str); 3341 if (dest_node_acl) 3342 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3343 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3344 3345 if (!dest_node_acl) { 3346 pr_err("Unable to locate %s dest_node_acl for" 3347 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3348 initiator_str); 3349 ret = TCM_INVALID_PARAMETER_LIST; 3350 goto out; 3351 } 3352 3353 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3354 pr_err("core_scsi3_nodeacl_depend_item() for" 3355 " dest_node_acl\n"); 3356 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3357 dest_node_acl = NULL; 3358 ret = TCM_INVALID_PARAMETER_LIST; 3359 goto out; 3360 } 3361 3362 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3363 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3364 dest_node_acl->initiatorname); 3365 3366 /* 3367 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3368 * PORT IDENTIFIER. 3369 */ 3370 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3371 if (!dest_se_deve) { 3372 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3373 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3374 ret = TCM_INVALID_PARAMETER_LIST; 3375 goto out; 3376 } 3377 3378 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3379 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3380 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3381 dest_se_deve = NULL; 3382 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3383 goto out; 3384 } 3385 3386 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3387 " ACL for dest_se_deve->mapped_lun: %llu\n", 3388 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3389 dest_se_deve->mapped_lun); 3390 3391 /* 3392 * A persistent reservation needs to already existing in order to 3393 * successfully complete the REGISTER_AND_MOVE service action.. 3394 */ 3395 spin_lock(&dev->dev_reservation_lock); 3396 pr_res_holder = dev->dev_pr_res_holder; 3397 if (!pr_res_holder) { 3398 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3399 " currently held\n"); 3400 spin_unlock(&dev->dev_reservation_lock); 3401 ret = TCM_INVALID_CDB_FIELD; 3402 goto out; 3403 } 3404 /* 3405 * The received on I_T Nexus must be the reservation holder. 3406 * 3407 * From spc4r17 section 5.7.8 Table 50 -- 3408 * Register behaviors for a REGISTER AND MOVE service action 3409 */ 3410 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3411 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3412 " Nexus is not reservation holder\n"); 3413 spin_unlock(&dev->dev_reservation_lock); 3414 ret = TCM_RESERVATION_CONFLICT; 3415 goto out; 3416 } 3417 /* 3418 * From spc4r17 section 5.7.8: registering and moving reservation 3419 * 3420 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3421 * action is received and the established persistent reservation is a 3422 * Write Exclusive - All Registrants type or Exclusive Access - 3423 * All Registrants type reservation, then the command shall be completed 3424 * with RESERVATION CONFLICT status. 3425 */ 3426 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3427 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3428 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3429 " reservation for type: %s\n", 3430 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3431 spin_unlock(&dev->dev_reservation_lock); 3432 ret = TCM_RESERVATION_CONFLICT; 3433 goto out; 3434 } 3435 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3436 /* 3437 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3438 */ 3439 type = pr_res_holder->pr_res_type; 3440 scope = pr_res_holder->pr_res_type; 3441 /* 3442 * c) Associate the reservation key specified in the SERVICE ACTION 3443 * RESERVATION KEY field with the I_T nexus specified as the 3444 * destination of the register and move, where: 3445 * A) The I_T nexus is specified by the TransportID and the 3446 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3447 * B) Regardless of the TransportID format used, the association for 3448 * the initiator port is based on either the initiator port name 3449 * (see 3.1.71) on SCSI transport protocols where port names are 3450 * required or the initiator port identifier (see 3.1.70) on SCSI 3451 * transport protocols where port names are not required; 3452 * d) Register the reservation key specified in the SERVICE ACTION 3453 * RESERVATION KEY field; 3454 * e) Retain the reservation key specified in the SERVICE ACTION 3455 * RESERVATION KEY field and associated information; 3456 * 3457 * Also, It is not an error for a REGISTER AND MOVE service action to 3458 * register an I_T nexus that is already registered with the same 3459 * reservation key or a different reservation key. 3460 */ 3461 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3462 iport_ptr); 3463 if (!dest_pr_reg) { 3464 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3465 kref_read(&dest_se_deve->pr_kref) != 0); 3466 3467 spin_unlock(&dev->dev_reservation_lock); 3468 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3469 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3470 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3471 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3472 goto out; 3473 } 3474 spin_lock(&dev->dev_reservation_lock); 3475 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3476 iport_ptr); 3477 new_reg = 1; 3478 } 3479 /* 3480 * f) Release the persistent reservation for the persistent reservation 3481 * holder (i.e., the I_T nexus on which the 3482 */ 3483 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3484 dev->dev_pr_res_holder, 0, 0); 3485 /* 3486 * g) Move the persistent reservation to the specified I_T nexus using 3487 * the same scope and type as the persistent reservation released in 3488 * item f); and 3489 */ 3490 dev->dev_pr_res_holder = dest_pr_reg; 3491 dest_pr_reg->pr_res_holder = 1; 3492 dest_pr_reg->pr_res_type = type; 3493 pr_reg->pr_res_scope = scope; 3494 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3495 /* 3496 * Increment PRGeneration for existing registrations.. 3497 */ 3498 if (!new_reg) 3499 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3500 spin_unlock(&dev->dev_reservation_lock); 3501 3502 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3503 " created new reservation holder TYPE: %s on object RTPI:" 3504 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3505 core_scsi3_pr_dump_type(type), rtpi, 3506 dest_pr_reg->pr_res_generation); 3507 pr_debug("SPC-3 PR Successfully moved reservation from" 3508 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3509 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3510 i_buf, dest_tf_ops->get_fabric_name(), 3511 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3512 iport_ptr : ""); 3513 /* 3514 * It is now safe to release configfs group dependencies for destination 3515 * of Transport ID Initiator Device/Port Identifier 3516 */ 3517 core_scsi3_lunacl_undepend_item(dest_se_deve); 3518 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3519 core_scsi3_tpg_undepend_item(dest_se_tpg); 3520 /* 3521 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3522 * nexus on which PERSISTENT RESERVE OUT command was received. 3523 */ 3524 if (unreg) { 3525 spin_lock(&pr_tmpl->registration_lock); 3526 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3527 spin_unlock(&pr_tmpl->registration_lock); 3528 } else 3529 core_scsi3_put_pr_reg(pr_reg); 3530 3531 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3532 3533 core_scsi3_put_pr_reg(dest_pr_reg); 3534 return 0; 3535 out: 3536 if (buf) 3537 transport_kunmap_data_sg(cmd); 3538 if (dest_se_deve) 3539 core_scsi3_lunacl_undepend_item(dest_se_deve); 3540 if (dest_node_acl) 3541 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3542 core_scsi3_tpg_undepend_item(dest_se_tpg); 3543 3544 out_put_pr_reg: 3545 core_scsi3_put_pr_reg(pr_reg); 3546 return ret; 3547 } 3548 3549 /* 3550 * See spc4r17 section 6.14 Table 170 3551 */ 3552 sense_reason_t 3553 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3554 { 3555 struct se_device *dev = cmd->se_dev; 3556 unsigned char *cdb = &cmd->t_task_cdb[0]; 3557 unsigned char *buf; 3558 u64 res_key, sa_res_key; 3559 int sa, scope, type, aptpl; 3560 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3561 sense_reason_t ret; 3562 3563 /* 3564 * Following spc2r20 5.5.1 Reservations overview: 3565 * 3566 * If a logical unit has been reserved by any RESERVE command and is 3567 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3568 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3569 * initiator or service action and shall terminate with a RESERVATION 3570 * CONFLICT status. 3571 */ 3572 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3573 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3574 " SPC-2 reservation is held, returning" 3575 " RESERVATION_CONFLICT\n"); 3576 return TCM_RESERVATION_CONFLICT; 3577 } 3578 3579 /* 3580 * FIXME: A NULL struct se_session pointer means an this is not coming from 3581 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3582 */ 3583 if (!cmd->se_sess) 3584 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3585 3586 if (cmd->data_length < 24) { 3587 pr_warn("SPC-PR: Received PR OUT parameter list" 3588 " length too small: %u\n", cmd->data_length); 3589 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3590 } 3591 3592 /* 3593 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3594 */ 3595 sa = (cdb[1] & 0x1f); 3596 scope = (cdb[2] & 0xf0); 3597 type = (cdb[2] & 0x0f); 3598 3599 buf = transport_kmap_data_sg(cmd); 3600 if (!buf) 3601 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3602 3603 /* 3604 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3605 */ 3606 res_key = get_unaligned_be64(&buf[0]); 3607 sa_res_key = get_unaligned_be64(&buf[8]); 3608 /* 3609 * REGISTER_AND_MOVE uses a different SA parameter list containing 3610 * SCSI TransportIDs. 3611 */ 3612 if (sa != PRO_REGISTER_AND_MOVE) { 3613 spec_i_pt = (buf[20] & 0x08); 3614 all_tg_pt = (buf[20] & 0x04); 3615 aptpl = (buf[20] & 0x01); 3616 } else { 3617 aptpl = (buf[17] & 0x01); 3618 unreg = (buf[17] & 0x02); 3619 } 3620 /* 3621 * If the backend device has been configured to force APTPL metadata 3622 * write-out, go ahead and propigate aptpl=1 down now. 3623 */ 3624 if (dev->dev_attrib.force_pr_aptpl) 3625 aptpl = 1; 3626 3627 transport_kunmap_data_sg(cmd); 3628 buf = NULL; 3629 3630 /* 3631 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3632 */ 3633 if (spec_i_pt && (sa != PRO_REGISTER)) 3634 return TCM_INVALID_PARAMETER_LIST; 3635 3636 /* 3637 * From spc4r17 section 6.14: 3638 * 3639 * If the SPEC_I_PT bit is set to zero, the service action is not 3640 * REGISTER AND MOVE, and the parameter list length is not 24, then 3641 * the command shall be terminated with CHECK CONDITION status, with 3642 * the sense key set to ILLEGAL REQUEST, and the additional sense 3643 * code set to PARAMETER LIST LENGTH ERROR. 3644 */ 3645 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3646 (cmd->data_length != 24)) { 3647 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3648 " list length: %u\n", cmd->data_length); 3649 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3650 } 3651 3652 /* 3653 * (core_scsi3_emulate_pro_* function parameters 3654 * are defined by spc4r17 Table 174: 3655 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3656 */ 3657 switch (sa) { 3658 case PRO_REGISTER: 3659 ret = core_scsi3_emulate_pro_register(cmd, 3660 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3661 break; 3662 case PRO_RESERVE: 3663 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3664 break; 3665 case PRO_RELEASE: 3666 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3667 break; 3668 case PRO_CLEAR: 3669 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3670 break; 3671 case PRO_PREEMPT: 3672 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3673 res_key, sa_res_key, PREEMPT); 3674 break; 3675 case PRO_PREEMPT_AND_ABORT: 3676 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3677 res_key, sa_res_key, PREEMPT_AND_ABORT); 3678 break; 3679 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3680 ret = core_scsi3_emulate_pro_register(cmd, 3681 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3682 break; 3683 case PRO_REGISTER_AND_MOVE: 3684 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3685 sa_res_key, aptpl, unreg); 3686 break; 3687 default: 3688 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3689 " action: 0x%02x\n", sa); 3690 return TCM_INVALID_CDB_FIELD; 3691 } 3692 3693 if (!ret) 3694 target_complete_cmd(cmd, GOOD); 3695 return ret; 3696 } 3697 3698 /* 3699 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3700 * 3701 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3702 */ 3703 static sense_reason_t 3704 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3705 { 3706 struct se_device *dev = cmd->se_dev; 3707 struct t10_pr_registration *pr_reg; 3708 unsigned char *buf; 3709 u32 add_len = 0, off = 8; 3710 3711 if (cmd->data_length < 8) { 3712 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3713 " too small\n", cmd->data_length); 3714 return TCM_INVALID_CDB_FIELD; 3715 } 3716 3717 buf = transport_kmap_data_sg(cmd); 3718 if (!buf) 3719 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3720 3721 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3722 3723 spin_lock(&dev->t10_pr.registration_lock); 3724 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3725 pr_reg_list) { 3726 /* 3727 * Check for overflow of 8byte PRI READ_KEYS payload and 3728 * next reservation key list descriptor. 3729 */ 3730 if ((add_len + 8) > (cmd->data_length - 8)) 3731 break; 3732 3733 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3734 off += 8; 3735 add_len += 8; 3736 } 3737 spin_unlock(&dev->t10_pr.registration_lock); 3738 3739 put_unaligned_be32(add_len, &buf[4]); 3740 3741 transport_kunmap_data_sg(cmd); 3742 3743 return 0; 3744 } 3745 3746 /* 3747 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3748 * 3749 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3750 */ 3751 static sense_reason_t 3752 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3753 { 3754 struct se_device *dev = cmd->se_dev; 3755 struct t10_pr_registration *pr_reg; 3756 unsigned char *buf; 3757 u64 pr_res_key; 3758 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3759 3760 if (cmd->data_length < 8) { 3761 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3762 " too small\n", cmd->data_length); 3763 return TCM_INVALID_CDB_FIELD; 3764 } 3765 3766 buf = transport_kmap_data_sg(cmd); 3767 if (!buf) 3768 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3769 3770 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3771 3772 spin_lock(&dev->dev_reservation_lock); 3773 pr_reg = dev->dev_pr_res_holder; 3774 if (pr_reg) { 3775 /* 3776 * Set the hardcoded Additional Length 3777 */ 3778 put_unaligned_be32(add_len, &buf[4]); 3779 3780 if (cmd->data_length < 22) 3781 goto err; 3782 3783 /* 3784 * Set the Reservation key. 3785 * 3786 * From spc4r17, section 5.7.10: 3787 * A persistent reservation holder has its reservation key 3788 * returned in the parameter data from a PERSISTENT 3789 * RESERVE IN command with READ RESERVATION service action as 3790 * follows: 3791 * a) For a persistent reservation of the type Write Exclusive 3792 * - All Registrants or Exclusive Access All Regitrants, 3793 * the reservation key shall be set to zero; or 3794 * b) For all other persistent reservation types, the 3795 * reservation key shall be set to the registered 3796 * reservation key for the I_T nexus that holds the 3797 * persistent reservation. 3798 */ 3799 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3800 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3801 pr_res_key = 0; 3802 else 3803 pr_res_key = pr_reg->pr_res_key; 3804 3805 put_unaligned_be64(pr_res_key, &buf[8]); 3806 /* 3807 * Set the SCOPE and TYPE 3808 */ 3809 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3810 (pr_reg->pr_res_type & 0x0f); 3811 } 3812 3813 err: 3814 spin_unlock(&dev->dev_reservation_lock); 3815 transport_kunmap_data_sg(cmd); 3816 3817 return 0; 3818 } 3819 3820 /* 3821 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3822 * 3823 * See spc4r17 section 6.13.4 Table 165 3824 */ 3825 static sense_reason_t 3826 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3827 { 3828 struct se_device *dev = cmd->se_dev; 3829 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3830 unsigned char *buf; 3831 u16 add_len = 8; /* Hardcoded to 8. */ 3832 3833 if (cmd->data_length < 6) { 3834 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3835 " %u too small\n", cmd->data_length); 3836 return TCM_INVALID_CDB_FIELD; 3837 } 3838 3839 buf = transport_kmap_data_sg(cmd); 3840 if (!buf) 3841 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3842 3843 put_unaligned_be16(add_len, &buf[0]); 3844 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3845 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3846 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3847 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3848 /* 3849 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3850 * set the TMV: Task Mask Valid bit. 3851 */ 3852 buf[3] |= 0x80; 3853 /* 3854 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3855 */ 3856 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3857 /* 3858 * PTPL_A: Persistence across Target Power Loss Active bit 3859 */ 3860 if (pr_tmpl->pr_aptpl_active) 3861 buf[3] |= 0x01; 3862 /* 3863 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3864 */ 3865 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3866 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3867 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3868 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3869 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3870 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3871 3872 transport_kunmap_data_sg(cmd); 3873 3874 return 0; 3875 } 3876 3877 /* 3878 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3879 * 3880 * See spc4r17 section 6.13.5 Table 168 and 169 3881 */ 3882 static sense_reason_t 3883 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3884 { 3885 struct se_device *dev = cmd->se_dev; 3886 struct se_node_acl *se_nacl; 3887 struct se_portal_group *se_tpg; 3888 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3889 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3890 unsigned char *buf; 3891 u32 add_desc_len = 0, add_len = 0; 3892 u32 off = 8; /* off into first Full Status descriptor */ 3893 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3894 int exp_desc_len, desc_len; 3895 bool all_reg = false; 3896 3897 if (cmd->data_length < 8) { 3898 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3899 " too small\n", cmd->data_length); 3900 return TCM_INVALID_CDB_FIELD; 3901 } 3902 3903 buf = transport_kmap_data_sg(cmd); 3904 if (!buf) 3905 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3906 3907 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3908 3909 spin_lock(&dev->dev_reservation_lock); 3910 if (dev->dev_pr_res_holder) { 3911 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3912 3913 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3914 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3915 all_reg = true; 3916 pr_res_type = pr_holder->pr_res_type; 3917 pr_res_scope = pr_holder->pr_res_scope; 3918 } 3919 } 3920 spin_unlock(&dev->dev_reservation_lock); 3921 3922 spin_lock(&pr_tmpl->registration_lock); 3923 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3924 &pr_tmpl->registration_list, pr_reg_list) { 3925 3926 se_nacl = pr_reg->pr_reg_nacl; 3927 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3928 add_desc_len = 0; 3929 3930 atomic_inc_mb(&pr_reg->pr_res_holders); 3931 spin_unlock(&pr_tmpl->registration_lock); 3932 /* 3933 * Determine expected length of $FABRIC_MOD specific 3934 * TransportID full status descriptor.. 3935 */ 3936 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3937 &format_code); 3938 if (exp_desc_len < 0 || 3939 exp_desc_len + add_len > cmd->data_length) { 3940 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3941 " out of buffer: %d\n", cmd->data_length); 3942 spin_lock(&pr_tmpl->registration_lock); 3943 atomic_dec_mb(&pr_reg->pr_res_holders); 3944 break; 3945 } 3946 /* 3947 * Set RESERVATION KEY 3948 */ 3949 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3950 off += 8; 3951 off += 4; /* Skip Over Reserved area */ 3952 3953 /* 3954 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3955 */ 3956 if (pr_reg->pr_reg_all_tg_pt) 3957 buf[off] = 0x02; 3958 /* 3959 * The struct se_lun pointer will be present for the 3960 * reservation holder for PR_HOLDER bit. 3961 * 3962 * Also, if this registration is the reservation 3963 * holder or there is an All Registrants reservation 3964 * active, fill in SCOPE and TYPE in the next byte. 3965 */ 3966 if (pr_reg->pr_res_holder) { 3967 buf[off++] |= 0x01; 3968 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3969 (pr_reg->pr_res_type & 0x0f); 3970 } else if (all_reg) { 3971 buf[off++] |= 0x01; 3972 buf[off++] = (pr_res_scope & 0xf0) | 3973 (pr_res_type & 0x0f); 3974 } else { 3975 off += 2; 3976 } 3977 3978 off += 4; /* Skip over reserved area */ 3979 /* 3980 * From spc4r17 6.3.15: 3981 * 3982 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3983 * IDENTIFIER field contains the relative port identifier (see 3984 * 3.1.120) of the target port that is part of the I_T nexus 3985 * described by this full status descriptor. If the ALL_TG_PT 3986 * bit is set to one, the contents of the RELATIVE TARGET PORT 3987 * IDENTIFIER field are not defined by this standard. 3988 */ 3989 if (!pr_reg->pr_reg_all_tg_pt) { 3990 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 3991 3992 put_unaligned_be16(sep_rtpi, &buf[off]); 3993 off += 2; 3994 } else 3995 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3996 3997 buf[off+4] = se_tpg->proto_id; 3998 3999 /* 4000 * Now, have the $FABRIC_MOD fill in the transport ID. 4001 */ 4002 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4003 &format_code, &buf[off+4]); 4004 4005 spin_lock(&pr_tmpl->registration_lock); 4006 atomic_dec_mb(&pr_reg->pr_res_holders); 4007 4008 if (desc_len < 0) 4009 break; 4010 /* 4011 * Set the ADDITIONAL DESCRIPTOR LENGTH 4012 */ 4013 put_unaligned_be32(desc_len, &buf[off]); 4014 off += 4; 4015 /* 4016 * Size of full desctipor header minus TransportID 4017 * containing $FABRIC_MOD specific) initiator device/port 4018 * WWN information. 4019 * 4020 * See spc4r17 Section 6.13.5 Table 169 4021 */ 4022 add_desc_len = (24 + desc_len); 4023 4024 off += desc_len; 4025 add_len += add_desc_len; 4026 } 4027 spin_unlock(&pr_tmpl->registration_lock); 4028 /* 4029 * Set ADDITIONAL_LENGTH 4030 */ 4031 put_unaligned_be32(add_len, &buf[4]); 4032 4033 transport_kunmap_data_sg(cmd); 4034 4035 return 0; 4036 } 4037 4038 sense_reason_t 4039 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4040 { 4041 sense_reason_t ret; 4042 4043 /* 4044 * Following spc2r20 5.5.1 Reservations overview: 4045 * 4046 * If a logical unit has been reserved by any RESERVE command and is 4047 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4048 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4049 * initiator or service action and shall terminate with a RESERVATION 4050 * CONFLICT status. 4051 */ 4052 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4053 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4054 " SPC-2 reservation is held, returning" 4055 " RESERVATION_CONFLICT\n"); 4056 return TCM_RESERVATION_CONFLICT; 4057 } 4058 4059 switch (cmd->t_task_cdb[1] & 0x1f) { 4060 case PRI_READ_KEYS: 4061 ret = core_scsi3_pri_read_keys(cmd); 4062 break; 4063 case PRI_READ_RESERVATION: 4064 ret = core_scsi3_pri_read_reservation(cmd); 4065 break; 4066 case PRI_REPORT_CAPABILITIES: 4067 ret = core_scsi3_pri_report_capabilities(cmd); 4068 break; 4069 case PRI_READ_FULL_STATUS: 4070 ret = core_scsi3_pri_read_full_status(cmd); 4071 break; 4072 default: 4073 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4074 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4075 return TCM_INVALID_CDB_FIELD; 4076 } 4077 4078 if (!ret) 4079 target_complete_cmd(cmd, GOOD); 4080 return ret; 4081 } 4082 4083 sense_reason_t 4084 target_check_reservation(struct se_cmd *cmd) 4085 { 4086 struct se_device *dev = cmd->se_dev; 4087 sense_reason_t ret; 4088 4089 if (!cmd->se_sess) 4090 return 0; 4091 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4092 return 0; 4093 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4094 return 0; 4095 4096 spin_lock(&dev->dev_reservation_lock); 4097 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4098 ret = target_scsi2_reservation_check(cmd); 4099 else 4100 ret = target_scsi3_pr_reservation_check(cmd); 4101 spin_unlock(&dev->dev_reservation_lock); 4102 4103 return ret; 4104 } 4105