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