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/file.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 #include <target/target_core_configfs.h> 39 40 #include "target_core_internal.h" 41 #include "target_core_pr.h" 42 #include "target_core_ua.h" 43 44 /* 45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 46 */ 47 struct pr_transport_id_holder { 48 int dest_local_nexus; 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 void core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) 62 buf[0] = '\0'; 63 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 65 } 66 67 enum register_type { 68 REGISTER, 69 REGISTER_AND_IGNORE_EXISTING_KEY, 70 REGISTER_AND_MOVE, 71 }; 72 73 enum preempt_type { 74 PREEMPT, 75 PREEMPT_AND_ABORT, 76 }; 77 78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 79 struct t10_pr_registration *, int); 80 81 static sense_reason_t 82 target_scsi2_reservation_check(struct se_cmd *cmd) 83 { 84 struct se_device *dev = cmd->se_dev; 85 struct se_session *sess = cmd->se_sess; 86 87 switch (cmd->t_task_cdb[0]) { 88 case INQUIRY: 89 case RELEASE: 90 case RELEASE_10: 91 return 0; 92 default: 93 break; 94 } 95 96 if (!dev->dev_reserved_node_acl || !sess) 97 return 0; 98 99 if (dev->dev_reserved_node_acl != sess->se_node_acl) 100 return TCM_RESERVATION_CONFLICT; 101 102 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 103 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 104 return TCM_RESERVATION_CONFLICT; 105 } 106 107 return 0; 108 } 109 110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 111 struct se_node_acl *, struct se_session *); 112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 113 114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 115 { 116 struct se_session *se_sess = cmd->se_sess; 117 struct se_device *dev = cmd->se_dev; 118 struct t10_pr_registration *pr_reg; 119 struct t10_reservation *pr_tmpl = &dev->t10_pr; 120 int conflict = 0; 121 122 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 123 se_sess); 124 if (pr_reg) { 125 /* 126 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 127 * behavior 128 * 129 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 130 * status, but no reservation shall be established and the 131 * persistent reservation shall not be changed, if the command 132 * is received from a) and b) below. 133 * 134 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 135 * status, but the persistent reservation shall not be released, 136 * if the command is received from a) and b) 137 * 138 * a) An I_T nexus that is a persistent reservation holder; or 139 * b) An I_T nexus that is registered if a registrants only or 140 * all registrants type persistent reservation is present. 141 * 142 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 143 * RELEASE(6) command, or RELEASE(10) command shall be processed 144 * as defined in SPC-2. 145 */ 146 if (pr_reg->pr_res_holder) { 147 core_scsi3_put_pr_reg(pr_reg); 148 return 1; 149 } 150 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 151 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 152 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 153 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 154 core_scsi3_put_pr_reg(pr_reg); 155 return 1; 156 } 157 core_scsi3_put_pr_reg(pr_reg); 158 conflict = 1; 159 } else { 160 /* 161 * Following spc2r20 5.5.1 Reservations overview: 162 * 163 * If a logical unit has executed a PERSISTENT RESERVE OUT 164 * command with the REGISTER or the REGISTER AND IGNORE 165 * EXISTING KEY service action and is still registered by any 166 * initiator, all RESERVE commands and all RELEASE commands 167 * regardless of initiator shall conflict and shall terminate 168 * with a RESERVATION CONFLICT status. 169 */ 170 spin_lock(&pr_tmpl->registration_lock); 171 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 172 spin_unlock(&pr_tmpl->registration_lock); 173 } 174 175 if (conflict) { 176 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 177 " while active SPC-3 registrations exist," 178 " returning RESERVATION_CONFLICT\n"); 179 return -EBUSY; 180 } 181 182 return 0; 183 } 184 185 sense_reason_t 186 target_scsi2_reservation_release(struct se_cmd *cmd) 187 { 188 struct se_device *dev = cmd->se_dev; 189 struct se_session *sess = cmd->se_sess; 190 struct se_portal_group *tpg; 191 int rc; 192 193 if (!sess || !sess->se_tpg) 194 goto out; 195 rc = target_check_scsi2_reservation_conflict(cmd); 196 if (rc == 1) 197 goto out; 198 if (rc < 0) 199 return TCM_RESERVATION_CONFLICT; 200 201 spin_lock(&dev->dev_reservation_lock); 202 if (!dev->dev_reserved_node_acl || !sess) 203 goto out_unlock; 204 205 if (dev->dev_reserved_node_acl != sess->se_node_acl) 206 goto out_unlock; 207 208 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 209 goto out_unlock; 210 211 dev->dev_reserved_node_acl = NULL; 212 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 213 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 214 dev->dev_res_bin_isid = 0; 215 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 216 } 217 tpg = sess->se_tpg; 218 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 219 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 220 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 221 sess->se_node_acl->initiatorname); 222 223 out_unlock: 224 spin_unlock(&dev->dev_reservation_lock); 225 out: 226 target_complete_cmd(cmd, GOOD); 227 return 0; 228 } 229 230 sense_reason_t 231 target_scsi2_reservation_reserve(struct se_cmd *cmd) 232 { 233 struct se_device *dev = cmd->se_dev; 234 struct se_session *sess = cmd->se_sess; 235 struct se_portal_group *tpg; 236 sense_reason_t ret = 0; 237 int rc; 238 239 if ((cmd->t_task_cdb[1] & 0x01) && 240 (cmd->t_task_cdb[1] & 0x02)) { 241 pr_err("LongIO and Obselete Bits set, returning" 242 " ILLEGAL_REQUEST\n"); 243 return TCM_UNSUPPORTED_SCSI_OPCODE; 244 } 245 /* 246 * This is currently the case for target_core_mod passthrough struct se_cmd 247 * ops 248 */ 249 if (!sess || !sess->se_tpg) 250 goto out; 251 rc = target_check_scsi2_reservation_conflict(cmd); 252 if (rc == 1) 253 goto out; 254 255 if (rc < 0) 256 return TCM_RESERVATION_CONFLICT; 257 258 tpg = sess->se_tpg; 259 spin_lock(&dev->dev_reservation_lock); 260 if (dev->dev_reserved_node_acl && 261 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 262 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 263 tpg->se_tpg_tfo->get_fabric_name()); 264 pr_err("Original reserver LUN: %u %s\n", 265 cmd->se_lun->unpacked_lun, 266 dev->dev_reserved_node_acl->initiatorname); 267 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 268 " from %s \n", cmd->se_lun->unpacked_lun, 269 cmd->se_deve->mapped_lun, 270 sess->se_node_acl->initiatorname); 271 ret = TCM_RESERVATION_CONFLICT; 272 goto out_unlock; 273 } 274 275 dev->dev_reserved_node_acl = sess->se_node_acl; 276 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 277 if (sess->sess_bin_isid != 0) { 278 dev->dev_res_bin_isid = sess->sess_bin_isid; 279 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 280 } 281 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 282 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 283 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 284 sess->se_node_acl->initiatorname); 285 286 out_unlock: 287 spin_unlock(&dev->dev_reservation_lock); 288 out: 289 if (!ret) 290 target_complete_cmd(cmd, GOOD); 291 return ret; 292 } 293 294 295 /* 296 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 297 * 298 * This function is called by those initiator ports who are *NOT* 299 * the active PR reservation holder when a reservation is present. 300 */ 301 static int core_scsi3_pr_seq_non_holder( 302 struct se_cmd *cmd, 303 u32 pr_reg_type) 304 { 305 unsigned char *cdb = cmd->t_task_cdb; 306 struct se_dev_entry *se_deve; 307 struct se_session *se_sess = cmd->se_sess; 308 int other_cdb = 0, ignore_reg; 309 int registered_nexus = 0, ret = 1; /* Conflict by default */ 310 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 311 int we = 0; /* Write Exclusive */ 312 int legacy = 0; /* Act like a legacy device and return 313 * RESERVATION CONFLICT on some CDBs */ 314 315 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 316 /* 317 * Determine if the registration should be ignored due to 318 * non-matching ISIDs in target_scsi3_pr_reservation_check(). 319 */ 320 ignore_reg = (pr_reg_type & 0x80000000); 321 if (ignore_reg) 322 pr_reg_type &= ~0x80000000; 323 324 switch (pr_reg_type) { 325 case PR_TYPE_WRITE_EXCLUSIVE: 326 we = 1; 327 case PR_TYPE_EXCLUSIVE_ACCESS: 328 /* 329 * Some commands are only allowed for the persistent reservation 330 * holder. 331 */ 332 if ((se_deve->def_pr_registered) && !(ignore_reg)) 333 registered_nexus = 1; 334 break; 335 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 336 we = 1; 337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 338 /* 339 * Some commands are only allowed for registered I_T Nexuses. 340 */ 341 reg_only = 1; 342 if ((se_deve->def_pr_registered) && !(ignore_reg)) 343 registered_nexus = 1; 344 break; 345 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 346 we = 1; 347 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 348 /* 349 * Each registered I_T Nexus is a reservation holder. 350 */ 351 all_reg = 1; 352 if ((se_deve->def_pr_registered) && !(ignore_reg)) 353 registered_nexus = 1; 354 break; 355 default: 356 return -EINVAL; 357 } 358 /* 359 * Referenced from spc4r17 table 45 for *NON* PR holder access 360 */ 361 switch (cdb[0]) { 362 case SECURITY_PROTOCOL_IN: 363 if (registered_nexus) 364 return 0; 365 ret = (we) ? 0 : 1; 366 break; 367 case MODE_SENSE: 368 case MODE_SENSE_10: 369 case READ_ATTRIBUTE: 370 case READ_BUFFER: 371 case RECEIVE_DIAGNOSTIC: 372 if (legacy) { 373 ret = 1; 374 break; 375 } 376 if (registered_nexus) { 377 ret = 0; 378 break; 379 } 380 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 381 break; 382 case PERSISTENT_RESERVE_OUT: 383 /* 384 * This follows PERSISTENT_RESERVE_OUT service actions that 385 * are allowed in the presence of various reservations. 386 * See spc4r17, table 46 387 */ 388 switch (cdb[1] & 0x1f) { 389 case PRO_CLEAR: 390 case PRO_PREEMPT: 391 case PRO_PREEMPT_AND_ABORT: 392 ret = (registered_nexus) ? 0 : 1; 393 break; 394 case PRO_REGISTER: 395 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 396 ret = 0; 397 break; 398 case PRO_REGISTER_AND_MOVE: 399 case PRO_RESERVE: 400 ret = 1; 401 break; 402 case PRO_RELEASE: 403 ret = (registered_nexus) ? 0 : 1; 404 break; 405 default: 406 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 407 " action: 0x%02x\n", cdb[1] & 0x1f); 408 return -EINVAL; 409 } 410 break; 411 case RELEASE: 412 case RELEASE_10: 413 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 414 ret = 0; 415 break; 416 case RESERVE: 417 case RESERVE_10: 418 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 419 ret = 0; 420 break; 421 case TEST_UNIT_READY: 422 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 423 break; 424 case MAINTENANCE_IN: 425 switch (cdb[1] & 0x1f) { 426 case MI_MANAGEMENT_PROTOCOL_IN: 427 if (registered_nexus) { 428 ret = 0; 429 break; 430 } 431 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 432 break; 433 case MI_REPORT_SUPPORTED_OPERATION_CODES: 434 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 435 if (legacy) { 436 ret = 1; 437 break; 438 } 439 if (registered_nexus) { 440 ret = 0; 441 break; 442 } 443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 444 break; 445 case MI_REPORT_ALIASES: 446 case MI_REPORT_IDENTIFYING_INFORMATION: 447 case MI_REPORT_PRIORITY: 448 case MI_REPORT_TARGET_PGS: 449 case MI_REPORT_TIMESTAMP: 450 ret = 0; /* Allowed */ 451 break; 452 default: 453 pr_err("Unknown MI Service Action: 0x%02x\n", 454 (cdb[1] & 0x1f)); 455 return -EINVAL; 456 } 457 break; 458 case ACCESS_CONTROL_IN: 459 case ACCESS_CONTROL_OUT: 460 case INQUIRY: 461 case LOG_SENSE: 462 case READ_MEDIA_SERIAL_NUMBER: 463 case REPORT_LUNS: 464 case REQUEST_SENSE: 465 case PERSISTENT_RESERVE_IN: 466 ret = 0; /*/ Allowed CDBs */ 467 break; 468 default: 469 other_cdb = 1; 470 break; 471 } 472 /* 473 * Case where the CDB is explicitly allowed in the above switch 474 * statement. 475 */ 476 if (!ret && !other_cdb) { 477 pr_debug("Allowing explicit CDB: 0x%02x for %s" 478 " reservation holder\n", cdb[0], 479 core_scsi3_pr_dump_type(pr_reg_type)); 480 481 return ret; 482 } 483 /* 484 * Check if write exclusive initiator ports *NOT* holding the 485 * WRITE_EXCLUSIVE_* reservation. 486 */ 487 if (we && !registered_nexus) { 488 if (cmd->data_direction == DMA_TO_DEVICE) { 489 /* 490 * Conflict for write exclusive 491 */ 492 pr_debug("%s Conflict for unregistered nexus" 493 " %s CDB: 0x%02x to %s reservation\n", 494 transport_dump_cmd_direction(cmd), 495 se_sess->se_node_acl->initiatorname, cdb[0], 496 core_scsi3_pr_dump_type(pr_reg_type)); 497 return 1; 498 } else { 499 /* 500 * Allow non WRITE CDBs for all Write Exclusive 501 * PR TYPEs to pass for registered and 502 * non-registered_nexuxes NOT holding the reservation. 503 * 504 * We only make noise for the unregisterd nexuses, 505 * as we expect registered non-reservation holding 506 * nexuses to issue CDBs. 507 */ 508 509 if (!registered_nexus) { 510 pr_debug("Allowing implicit CDB: 0x%02x" 511 " for %s reservation on unregistered" 512 " nexus\n", cdb[0], 513 core_scsi3_pr_dump_type(pr_reg_type)); 514 } 515 516 return 0; 517 } 518 } else if ((reg_only) || (all_reg)) { 519 if (registered_nexus) { 520 /* 521 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 522 * allow commands from registered nexuses. 523 */ 524 525 pr_debug("Allowing implicit CDB: 0x%02x for %s" 526 " reservation\n", cdb[0], 527 core_scsi3_pr_dump_type(pr_reg_type)); 528 529 return 0; 530 } 531 } 532 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 533 " for %s reservation\n", transport_dump_cmd_direction(cmd), 534 (registered_nexus) ? "" : "un", 535 se_sess->se_node_acl->initiatorname, cdb[0], 536 core_scsi3_pr_dump_type(pr_reg_type)); 537 538 return 1; /* Conflict by default */ 539 } 540 541 static sense_reason_t 542 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 543 { 544 struct se_device *dev = cmd->se_dev; 545 struct se_session *sess = cmd->se_sess; 546 u32 pr_reg_type; 547 548 if (!dev->dev_pr_res_holder) 549 return 0; 550 551 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 552 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 553 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 554 goto check_nonholder; 555 556 if (dev->dev_pr_res_holder->isid_present_at_reg) { 557 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 558 sess->sess_bin_isid) { 559 pr_reg_type |= 0x80000000; 560 goto check_nonholder; 561 } 562 } 563 564 return 0; 565 566 check_nonholder: 567 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type)) 568 return TCM_RESERVATION_CONFLICT; 569 return 0; 570 } 571 572 static u32 core_scsi3_pr_generation(struct se_device *dev) 573 { 574 u32 prg; 575 576 /* 577 * PRGeneration field shall contain the value of a 32-bit wrapping 578 * counter mainted by the device server. 579 * 580 * Note that this is done regardless of Active Persist across 581 * Target PowerLoss (APTPL) 582 * 583 * See spc4r17 section 6.3.12 READ_KEYS service action 584 */ 585 spin_lock(&dev->dev_reservation_lock); 586 prg = dev->t10_pr.pr_generation++; 587 spin_unlock(&dev->dev_reservation_lock); 588 589 return prg; 590 } 591 592 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 593 struct se_device *dev, 594 struct se_node_acl *nacl, 595 struct se_dev_entry *deve, 596 unsigned char *isid, 597 u64 sa_res_key, 598 int all_tg_pt, 599 int aptpl) 600 { 601 struct t10_pr_registration *pr_reg; 602 603 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 604 if (!pr_reg) { 605 pr_err("Unable to allocate struct t10_pr_registration\n"); 606 return NULL; 607 } 608 609 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 610 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 611 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 612 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 613 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 614 atomic_set(&pr_reg->pr_res_holders, 0); 615 pr_reg->pr_reg_nacl = nacl; 616 pr_reg->pr_reg_deve = deve; 617 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 618 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 619 pr_reg->pr_res_key = sa_res_key; 620 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 621 pr_reg->pr_reg_aptpl = aptpl; 622 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 623 /* 624 * If an ISID value for this SCSI Initiator Port exists, 625 * save it to the registration now. 626 */ 627 if (isid != NULL) { 628 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 629 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 630 pr_reg->isid_present_at_reg = 1; 631 } 632 633 return pr_reg; 634 } 635 636 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 637 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 638 639 /* 640 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 641 * modes. 642 */ 643 static struct t10_pr_registration *__core_scsi3_alloc_registration( 644 struct se_device *dev, 645 struct se_node_acl *nacl, 646 struct se_dev_entry *deve, 647 unsigned char *isid, 648 u64 sa_res_key, 649 int all_tg_pt, 650 int aptpl) 651 { 652 struct se_dev_entry *deve_tmp; 653 struct se_node_acl *nacl_tmp; 654 struct se_port *port, *port_tmp; 655 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 656 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 657 int ret; 658 /* 659 * Create a registration for the I_T Nexus upon which the 660 * PROUT REGISTER was received. 661 */ 662 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 663 sa_res_key, all_tg_pt, aptpl); 664 if (!pr_reg) 665 return NULL; 666 /* 667 * Return pointer to pr_reg for ALL_TG_PT=0 668 */ 669 if (!all_tg_pt) 670 return pr_reg; 671 /* 672 * Create list of matching SCSI Initiator Port registrations 673 * for ALL_TG_PT=1 674 */ 675 spin_lock(&dev->se_port_lock); 676 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 677 atomic_inc(&port->sep_tg_pt_ref_cnt); 678 smp_mb__after_atomic(); 679 spin_unlock(&dev->se_port_lock); 680 681 spin_lock_bh(&port->sep_alua_lock); 682 list_for_each_entry(deve_tmp, &port->sep_alua_list, 683 alua_port_list) { 684 /* 685 * This pointer will be NULL for demo mode MappedLUNs 686 * that have not been make explicit via a ConfigFS 687 * MappedLUN group for the SCSI Initiator Node ACL. 688 */ 689 if (!deve_tmp->se_lun_acl) 690 continue; 691 692 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 693 /* 694 * Skip the matching struct se_node_acl that is allocated 695 * above.. 696 */ 697 if (nacl == nacl_tmp) 698 continue; 699 /* 700 * Only perform PR registrations for target ports on 701 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 702 * arrived. 703 */ 704 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 705 continue; 706 /* 707 * Look for a matching Initiator Node ACL in ASCII format 708 */ 709 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 710 continue; 711 712 atomic_inc(&deve_tmp->pr_ref_count); 713 smp_mb__after_atomic(); 714 spin_unlock_bh(&port->sep_alua_lock); 715 /* 716 * Grab a configfs group dependency that is released 717 * for the exception path at label out: below, or upon 718 * completion of adding ALL_TG_PT=1 registrations in 719 * __core_scsi3_add_registration() 720 */ 721 ret = core_scsi3_lunacl_depend_item(deve_tmp); 722 if (ret < 0) { 723 pr_err("core_scsi3_lunacl_depend" 724 "_item() failed\n"); 725 atomic_dec(&port->sep_tg_pt_ref_cnt); 726 smp_mb__after_atomic(); 727 atomic_dec(&deve_tmp->pr_ref_count); 728 smp_mb__after_atomic(); 729 goto out; 730 } 731 /* 732 * Located a matching SCSI Initiator Port on a different 733 * port, allocate the pr_reg_atp and attach it to the 734 * pr_reg->pr_reg_atp_list that will be processed once 735 * the original *pr_reg is processed in 736 * __core_scsi3_add_registration() 737 */ 738 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 739 nacl_tmp, deve_tmp, NULL, 740 sa_res_key, all_tg_pt, aptpl); 741 if (!pr_reg_atp) { 742 atomic_dec(&port->sep_tg_pt_ref_cnt); 743 smp_mb__after_atomic(); 744 atomic_dec(&deve_tmp->pr_ref_count); 745 smp_mb__after_atomic(); 746 core_scsi3_lunacl_undepend_item(deve_tmp); 747 goto out; 748 } 749 750 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 751 &pr_reg->pr_reg_atp_list); 752 spin_lock_bh(&port->sep_alua_lock); 753 } 754 spin_unlock_bh(&port->sep_alua_lock); 755 756 spin_lock(&dev->se_port_lock); 757 atomic_dec(&port->sep_tg_pt_ref_cnt); 758 smp_mb__after_atomic(); 759 } 760 spin_unlock(&dev->se_port_lock); 761 762 return pr_reg; 763 out: 764 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 765 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 766 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 767 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 768 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 769 } 770 kmem_cache_free(t10_pr_reg_cache, pr_reg); 771 return NULL; 772 } 773 774 int core_scsi3_alloc_aptpl_registration( 775 struct t10_reservation *pr_tmpl, 776 u64 sa_res_key, 777 unsigned char *i_port, 778 unsigned char *isid, 779 u32 mapped_lun, 780 unsigned char *t_port, 781 u16 tpgt, 782 u32 target_lun, 783 int res_holder, 784 int all_tg_pt, 785 u8 type) 786 { 787 struct t10_pr_registration *pr_reg; 788 789 if (!i_port || !t_port || !sa_res_key) { 790 pr_err("Illegal parameters for APTPL registration\n"); 791 return -EINVAL; 792 } 793 794 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 795 if (!pr_reg) { 796 pr_err("Unable to allocate struct t10_pr_registration\n"); 797 return -ENOMEM; 798 } 799 800 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 801 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 802 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 803 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 804 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 805 atomic_set(&pr_reg->pr_res_holders, 0); 806 pr_reg->pr_reg_nacl = NULL; 807 pr_reg->pr_reg_deve = NULL; 808 pr_reg->pr_res_mapped_lun = mapped_lun; 809 pr_reg->pr_aptpl_target_lun = target_lun; 810 pr_reg->pr_res_key = sa_res_key; 811 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 812 pr_reg->pr_reg_aptpl = 1; 813 pr_reg->pr_reg_tg_pt_lun = NULL; 814 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 815 pr_reg->pr_res_type = type; 816 /* 817 * If an ISID value had been saved in APTPL metadata for this 818 * SCSI Initiator Port, restore it now. 819 */ 820 if (isid != NULL) { 821 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 822 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 823 pr_reg->isid_present_at_reg = 1; 824 } 825 /* 826 * Copy the i_port and t_port information from caller. 827 */ 828 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 829 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 830 pr_reg->pr_reg_tpgt = tpgt; 831 /* 832 * Set pr_res_holder from caller, the pr_reg who is the reservation 833 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 834 * the Initiator Node LUN ACL from the fabric module is created for 835 * this registration. 836 */ 837 pr_reg->pr_res_holder = res_holder; 838 839 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 840 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 841 " metadata\n", (res_holder) ? "+reservation" : ""); 842 return 0; 843 } 844 845 static void core_scsi3_aptpl_reserve( 846 struct se_device *dev, 847 struct se_portal_group *tpg, 848 struct se_node_acl *node_acl, 849 struct t10_pr_registration *pr_reg) 850 { 851 char i_buf[PR_REG_ISID_ID_LEN]; 852 853 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 854 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 855 856 spin_lock(&dev->dev_reservation_lock); 857 dev->dev_pr_res_holder = pr_reg; 858 spin_unlock(&dev->dev_reservation_lock); 859 860 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 861 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 862 tpg->se_tpg_tfo->get_fabric_name(), 863 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 864 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 865 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 866 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 867 i_buf); 868 } 869 870 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 871 struct t10_pr_registration *, enum register_type, int); 872 873 static int __core_scsi3_check_aptpl_registration( 874 struct se_device *dev, 875 struct se_portal_group *tpg, 876 struct se_lun *lun, 877 u32 target_lun, 878 struct se_node_acl *nacl, 879 struct se_dev_entry *deve) 880 { 881 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 882 struct t10_reservation *pr_tmpl = &dev->t10_pr; 883 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 884 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 885 u16 tpgt; 886 887 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 888 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 889 /* 890 * Copy Initiator Port information from struct se_node_acl 891 */ 892 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 893 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 894 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 895 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 896 /* 897 * Look for the matching registrations+reservation from those 898 * created from APTPL metadata. Note that multiple registrations 899 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 900 * TransportIDs. 901 */ 902 spin_lock(&pr_tmpl->aptpl_reg_lock); 903 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 904 pr_reg_aptpl_list) { 905 if (!strcmp(pr_reg->pr_iport, i_port) && 906 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 907 !(strcmp(pr_reg->pr_tport, t_port)) && 908 (pr_reg->pr_reg_tpgt == tpgt) && 909 (pr_reg->pr_aptpl_target_lun == target_lun)) { 910 911 pr_reg->pr_reg_nacl = nacl; 912 pr_reg->pr_reg_deve = deve; 913 pr_reg->pr_reg_tg_pt_lun = lun; 914 915 list_del(&pr_reg->pr_reg_aptpl_list); 916 spin_unlock(&pr_tmpl->aptpl_reg_lock); 917 /* 918 * At this point all of the pointers in *pr_reg will 919 * be setup, so go ahead and add the registration. 920 */ 921 922 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 923 /* 924 * If this registration is the reservation holder, 925 * make that happen now.. 926 */ 927 if (pr_reg->pr_res_holder) 928 core_scsi3_aptpl_reserve(dev, tpg, 929 nacl, pr_reg); 930 /* 931 * Reenable pr_aptpl_active to accept new metadata 932 * updates once the SCSI device is active again.. 933 */ 934 spin_lock(&pr_tmpl->aptpl_reg_lock); 935 pr_tmpl->pr_aptpl_active = 1; 936 } 937 } 938 spin_unlock(&pr_tmpl->aptpl_reg_lock); 939 940 return 0; 941 } 942 943 int core_scsi3_check_aptpl_registration( 944 struct se_device *dev, 945 struct se_portal_group *tpg, 946 struct se_lun *lun, 947 struct se_lun_acl *lun_acl) 948 { 949 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 950 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun]; 951 952 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 953 return 0; 954 955 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 956 lun->unpacked_lun, nacl, deve); 957 } 958 959 static void __core_scsi3_dump_registration( 960 struct target_core_fabric_ops *tfo, 961 struct se_device *dev, 962 struct se_node_acl *nacl, 963 struct t10_pr_registration *pr_reg, 964 enum register_type register_type) 965 { 966 struct se_portal_group *se_tpg = nacl->se_tpg; 967 char i_buf[PR_REG_ISID_ID_LEN]; 968 969 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 970 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 971 972 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 973 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 974 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 975 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 976 i_buf); 977 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 978 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 979 tfo->tpg_get_tag(se_tpg)); 980 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 981 " Port(s)\n", tfo->get_fabric_name(), 982 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 983 dev->transport->name); 984 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 985 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 986 pr_reg->pr_res_key, pr_reg->pr_res_generation, 987 pr_reg->pr_reg_aptpl); 988 } 989 990 /* 991 * this function can be called with struct se_device->dev_reservation_lock 992 * when register_move = 1 993 */ 994 static void __core_scsi3_add_registration( 995 struct se_device *dev, 996 struct se_node_acl *nacl, 997 struct t10_pr_registration *pr_reg, 998 enum register_type register_type, 999 int register_move) 1000 { 1001 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1002 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1003 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1004 1005 /* 1006 * Increment PRgeneration counter for struct se_device upon a successful 1007 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1008 * 1009 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1010 * action, the struct se_device->dev_reservation_lock will already be held, 1011 * so we do not call core_scsi3_pr_generation() which grabs the lock 1012 * for the REGISTER. 1013 */ 1014 pr_reg->pr_res_generation = (register_move) ? 1015 dev->t10_pr.pr_generation++ : 1016 core_scsi3_pr_generation(dev); 1017 1018 spin_lock(&pr_tmpl->registration_lock); 1019 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1020 pr_reg->pr_reg_deve->def_pr_registered = 1; 1021 1022 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1023 spin_unlock(&pr_tmpl->registration_lock); 1024 /* 1025 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1026 */ 1027 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1028 return; 1029 /* 1030 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1031 * allocated in __core_scsi3_alloc_registration() 1032 */ 1033 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1034 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1035 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1036 1037 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1038 1039 spin_lock(&pr_tmpl->registration_lock); 1040 list_add_tail(&pr_reg_tmp->pr_reg_list, 1041 &pr_tmpl->registration_list); 1042 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1043 1044 __core_scsi3_dump_registration(tfo, dev, 1045 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1046 register_type); 1047 spin_unlock(&pr_tmpl->registration_lock); 1048 /* 1049 * Drop configfs group dependency reference from 1050 * __core_scsi3_alloc_registration() 1051 */ 1052 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1053 } 1054 } 1055 1056 static int core_scsi3_alloc_registration( 1057 struct se_device *dev, 1058 struct se_node_acl *nacl, 1059 struct se_dev_entry *deve, 1060 unsigned char *isid, 1061 u64 sa_res_key, 1062 int all_tg_pt, 1063 int aptpl, 1064 enum register_type register_type, 1065 int register_move) 1066 { 1067 struct t10_pr_registration *pr_reg; 1068 1069 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1070 sa_res_key, all_tg_pt, aptpl); 1071 if (!pr_reg) 1072 return -EPERM; 1073 1074 __core_scsi3_add_registration(dev, nacl, pr_reg, 1075 register_type, register_move); 1076 return 0; 1077 } 1078 1079 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1080 struct se_device *dev, 1081 struct se_node_acl *nacl, 1082 unsigned char *isid) 1083 { 1084 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1085 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1086 struct se_portal_group *tpg; 1087 1088 spin_lock(&pr_tmpl->registration_lock); 1089 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1090 &pr_tmpl->registration_list, pr_reg_list) { 1091 /* 1092 * First look for a matching struct se_node_acl 1093 */ 1094 if (pr_reg->pr_reg_nacl != nacl) 1095 continue; 1096 1097 tpg = pr_reg->pr_reg_nacl->se_tpg; 1098 /* 1099 * If this registration does NOT contain a fabric provided 1100 * ISID, then we have found a match. 1101 */ 1102 if (!pr_reg->isid_present_at_reg) { 1103 /* 1104 * Determine if this SCSI device server requires that 1105 * SCSI Intiatior TransportID w/ ISIDs is enforced 1106 * for fabric modules (iSCSI) requiring them. 1107 */ 1108 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1109 if (dev->dev_attrib.enforce_pr_isids) 1110 continue; 1111 } 1112 atomic_inc(&pr_reg->pr_res_holders); 1113 smp_mb__after_atomic(); 1114 spin_unlock(&pr_tmpl->registration_lock); 1115 return pr_reg; 1116 } 1117 /* 1118 * If the *pr_reg contains a fabric defined ISID for multi-value 1119 * SCSI Initiator Port TransportIDs, then we expect a valid 1120 * matching ISID to be provided by the local SCSI Initiator Port. 1121 */ 1122 if (!isid) 1123 continue; 1124 if (strcmp(isid, pr_reg->pr_reg_isid)) 1125 continue; 1126 1127 atomic_inc(&pr_reg->pr_res_holders); 1128 smp_mb__after_atomic(); 1129 spin_unlock(&pr_tmpl->registration_lock); 1130 return pr_reg; 1131 } 1132 spin_unlock(&pr_tmpl->registration_lock); 1133 1134 return NULL; 1135 } 1136 1137 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1138 struct se_device *dev, 1139 struct se_node_acl *nacl, 1140 struct se_session *sess) 1141 { 1142 struct se_portal_group *tpg = nacl->se_tpg; 1143 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1144 1145 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1146 memset(&buf[0], 0, PR_REG_ISID_LEN); 1147 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1148 PR_REG_ISID_LEN); 1149 isid_ptr = &buf[0]; 1150 } 1151 1152 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1153 } 1154 1155 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1156 { 1157 atomic_dec(&pr_reg->pr_res_holders); 1158 smp_mb__after_atomic(); 1159 } 1160 1161 static int core_scsi3_check_implicit_release( 1162 struct se_device *dev, 1163 struct t10_pr_registration *pr_reg) 1164 { 1165 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1166 struct t10_pr_registration *pr_res_holder; 1167 int ret = 0; 1168 1169 spin_lock(&dev->dev_reservation_lock); 1170 pr_res_holder = dev->dev_pr_res_holder; 1171 if (!pr_res_holder) { 1172 spin_unlock(&dev->dev_reservation_lock); 1173 return ret; 1174 } 1175 if (pr_res_holder == pr_reg) { 1176 /* 1177 * Perform an implicit RELEASE if the registration that 1178 * is being released is holding the reservation. 1179 * 1180 * From spc4r17, section 5.7.11.1: 1181 * 1182 * e) If the I_T nexus is the persistent reservation holder 1183 * and the persistent reservation is not an all registrants 1184 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1185 * service action or REGISTER AND IGNORE EXISTING KEY 1186 * service action with the SERVICE ACTION RESERVATION KEY 1187 * field set to zero (see 5.7.11.3). 1188 */ 1189 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1190 ret = 1; 1191 /* 1192 * For 'All Registrants' reservation types, all existing 1193 * registrations are still processed as reservation holders 1194 * in core_scsi3_pr_seq_non_holder() after the initial 1195 * reservation holder is implicitly released here. 1196 */ 1197 } else if (pr_reg->pr_reg_all_tg_pt && 1198 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1199 pr_reg->pr_reg_nacl->initiatorname)) && 1200 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1201 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1202 " UNREGISTER while existing reservation with matching" 1203 " key 0x%016Lx is present from another SCSI Initiator" 1204 " Port\n", pr_reg->pr_res_key); 1205 ret = -EPERM; 1206 } 1207 spin_unlock(&dev->dev_reservation_lock); 1208 1209 return ret; 1210 } 1211 1212 /* 1213 * Called with struct t10_reservation->registration_lock held. 1214 */ 1215 static void __core_scsi3_free_registration( 1216 struct se_device *dev, 1217 struct t10_pr_registration *pr_reg, 1218 struct list_head *preempt_and_abort_list, 1219 int dec_holders) 1220 { 1221 struct target_core_fabric_ops *tfo = 1222 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1223 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1224 char i_buf[PR_REG_ISID_ID_LEN]; 1225 1226 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1227 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1228 1229 pr_reg->pr_reg_deve->def_pr_registered = 0; 1230 pr_reg->pr_reg_deve->pr_res_key = 0; 1231 list_del(&pr_reg->pr_reg_list); 1232 /* 1233 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1234 * so call core_scsi3_put_pr_reg() to decrement our reference. 1235 */ 1236 if (dec_holders) 1237 core_scsi3_put_pr_reg(pr_reg); 1238 /* 1239 * Wait until all reference from any other I_T nexuses for this 1240 * *pr_reg have been released. Because list_del() is called above, 1241 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1242 * count back to zero, and we release *pr_reg. 1243 */ 1244 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1245 spin_unlock(&pr_tmpl->registration_lock); 1246 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1247 tfo->get_fabric_name()); 1248 cpu_relax(); 1249 spin_lock(&pr_tmpl->registration_lock); 1250 } 1251 1252 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1253 " Node: %s%s\n", tfo->get_fabric_name(), 1254 pr_reg->pr_reg_nacl->initiatorname, 1255 i_buf); 1256 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1257 " Port(s)\n", tfo->get_fabric_name(), 1258 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1259 dev->transport->name); 1260 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1261 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1262 pr_reg->pr_res_generation); 1263 1264 if (!preempt_and_abort_list) { 1265 pr_reg->pr_reg_deve = NULL; 1266 pr_reg->pr_reg_nacl = NULL; 1267 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1268 return; 1269 } 1270 /* 1271 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1272 * are released once the ABORT_TASK_SET has completed.. 1273 */ 1274 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1275 } 1276 1277 void core_scsi3_free_pr_reg_from_nacl( 1278 struct se_device *dev, 1279 struct se_node_acl *nacl) 1280 { 1281 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1282 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1283 /* 1284 * If the passed se_node_acl matches the reservation holder, 1285 * release the reservation. 1286 */ 1287 spin_lock(&dev->dev_reservation_lock); 1288 pr_res_holder = dev->dev_pr_res_holder; 1289 if ((pr_res_holder != NULL) && 1290 (pr_res_holder->pr_reg_nacl == nacl)) 1291 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1292 spin_unlock(&dev->dev_reservation_lock); 1293 /* 1294 * Release any registration associated with the struct se_node_acl. 1295 */ 1296 spin_lock(&pr_tmpl->registration_lock); 1297 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1298 &pr_tmpl->registration_list, pr_reg_list) { 1299 1300 if (pr_reg->pr_reg_nacl != nacl) 1301 continue; 1302 1303 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1304 } 1305 spin_unlock(&pr_tmpl->registration_lock); 1306 } 1307 1308 void core_scsi3_free_all_registrations( 1309 struct se_device *dev) 1310 { 1311 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1312 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1313 1314 spin_lock(&dev->dev_reservation_lock); 1315 pr_res_holder = dev->dev_pr_res_holder; 1316 if (pr_res_holder != NULL) { 1317 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1318 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1319 pr_res_holder, 0); 1320 } 1321 spin_unlock(&dev->dev_reservation_lock); 1322 1323 spin_lock(&pr_tmpl->registration_lock); 1324 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1325 &pr_tmpl->registration_list, pr_reg_list) { 1326 1327 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1328 } 1329 spin_unlock(&pr_tmpl->registration_lock); 1330 1331 spin_lock(&pr_tmpl->aptpl_reg_lock); 1332 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1333 pr_reg_aptpl_list) { 1334 list_del(&pr_reg->pr_reg_aptpl_list); 1335 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1336 } 1337 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1338 } 1339 1340 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1341 { 1342 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1343 &tpg->tpg_group.cg_item); 1344 } 1345 1346 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1347 { 1348 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1349 &tpg->tpg_group.cg_item); 1350 1351 atomic_dec(&tpg->tpg_pr_ref_count); 1352 smp_mb__after_atomic(); 1353 } 1354 1355 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1356 { 1357 struct se_portal_group *tpg = nacl->se_tpg; 1358 1359 if (nacl->dynamic_node_acl) 1360 return 0; 1361 1362 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1363 &nacl->acl_group.cg_item); 1364 } 1365 1366 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1367 { 1368 struct se_portal_group *tpg = nacl->se_tpg; 1369 1370 if (nacl->dynamic_node_acl) { 1371 atomic_dec(&nacl->acl_pr_ref_count); 1372 smp_mb__after_atomic(); 1373 return; 1374 } 1375 1376 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1377 &nacl->acl_group.cg_item); 1378 1379 atomic_dec(&nacl->acl_pr_ref_count); 1380 smp_mb__after_atomic(); 1381 } 1382 1383 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1384 { 1385 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1386 struct se_node_acl *nacl; 1387 struct se_portal_group *tpg; 1388 /* 1389 * For nacl->dynamic_node_acl=1 1390 */ 1391 if (!lun_acl) 1392 return 0; 1393 1394 nacl = lun_acl->se_lun_nacl; 1395 tpg = nacl->se_tpg; 1396 1397 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1398 &lun_acl->se_lun_group.cg_item); 1399 } 1400 1401 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1402 { 1403 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1404 struct se_node_acl *nacl; 1405 struct se_portal_group *tpg; 1406 /* 1407 * For nacl->dynamic_node_acl=1 1408 */ 1409 if (!lun_acl) { 1410 atomic_dec(&se_deve->pr_ref_count); 1411 smp_mb__after_atomic(); 1412 return; 1413 } 1414 nacl = lun_acl->se_lun_nacl; 1415 tpg = nacl->se_tpg; 1416 1417 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1418 &lun_acl->se_lun_group.cg_item); 1419 1420 atomic_dec(&se_deve->pr_ref_count); 1421 smp_mb__after_atomic(); 1422 } 1423 1424 static sense_reason_t 1425 core_scsi3_decode_spec_i_port( 1426 struct se_cmd *cmd, 1427 struct se_portal_group *tpg, 1428 unsigned char *l_isid, 1429 u64 sa_res_key, 1430 int all_tg_pt, 1431 int aptpl) 1432 { 1433 struct se_device *dev = cmd->se_dev; 1434 struct se_port *tmp_port; 1435 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1436 struct se_session *se_sess = cmd->se_sess; 1437 struct se_node_acl *dest_node_acl = NULL; 1438 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1439 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1440 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1441 LIST_HEAD(tid_dest_list); 1442 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1443 struct target_core_fabric_ops *tmp_tf_ops; 1444 unsigned char *buf; 1445 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1446 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1447 sense_reason_t ret; 1448 u32 tpdl, tid_len = 0; 1449 int dest_local_nexus; 1450 u32 dest_rtpi = 0; 1451 1452 memset(dest_iport, 0, 64); 1453 1454 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1455 /* 1456 * Allocate a struct pr_transport_id_holder and setup the 1457 * local_node_acl and local_se_deve pointers and add to 1458 * struct list_head tid_dest_list for add registration 1459 * processing in the loop of tid_dest_list below. 1460 */ 1461 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1462 if (!tidh_new) { 1463 pr_err("Unable to allocate tidh_new\n"); 1464 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1465 } 1466 INIT_LIST_HEAD(&tidh_new->dest_list); 1467 tidh_new->dest_tpg = tpg; 1468 tidh_new->dest_node_acl = se_sess->se_node_acl; 1469 tidh_new->dest_se_deve = local_se_deve; 1470 1471 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1472 se_sess->se_node_acl, local_se_deve, l_isid, 1473 sa_res_key, all_tg_pt, aptpl); 1474 if (!local_pr_reg) { 1475 kfree(tidh_new); 1476 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1477 } 1478 tidh_new->dest_pr_reg = local_pr_reg; 1479 /* 1480 * The local I_T nexus does not hold any configfs dependances, 1481 * so we set tid_h->dest_local_nexus=1 to prevent the 1482 * configfs_undepend_item() calls in the tid_dest_list loops below. 1483 */ 1484 tidh_new->dest_local_nexus = 1; 1485 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1486 1487 if (cmd->data_length < 28) { 1488 pr_warn("SPC-PR: Received PR OUT parameter list" 1489 " length too small: %u\n", cmd->data_length); 1490 ret = TCM_INVALID_PARAMETER_LIST; 1491 goto out; 1492 } 1493 1494 buf = transport_kmap_data_sg(cmd); 1495 if (!buf) { 1496 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1497 goto out; 1498 } 1499 1500 /* 1501 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1502 * first extract TransportID Parameter Data Length, and make sure 1503 * the value matches up to the SCSI expected data transfer length. 1504 */ 1505 tpdl = (buf[24] & 0xff) << 24; 1506 tpdl |= (buf[25] & 0xff) << 16; 1507 tpdl |= (buf[26] & 0xff) << 8; 1508 tpdl |= buf[27] & 0xff; 1509 1510 if ((tpdl + 28) != cmd->data_length) { 1511 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1512 " does not equal CDB data_length: %u\n", tpdl, 1513 cmd->data_length); 1514 ret = TCM_INVALID_PARAMETER_LIST; 1515 goto out_unmap; 1516 } 1517 /* 1518 * Start processing the received transport IDs using the 1519 * receiving I_T Nexus portal's fabric dependent methods to 1520 * obtain the SCSI Initiator Port/Device Identifiers. 1521 */ 1522 ptr = &buf[28]; 1523 1524 while (tpdl > 0) { 1525 proto_ident = (ptr[0] & 0x0f); 1526 dest_tpg = NULL; 1527 1528 spin_lock(&dev->se_port_lock); 1529 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1530 tmp_tpg = tmp_port->sep_tpg; 1531 if (!tmp_tpg) 1532 continue; 1533 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1534 if (!tmp_tf_ops) 1535 continue; 1536 if (!tmp_tf_ops->get_fabric_proto_ident || 1537 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1538 continue; 1539 /* 1540 * Look for the matching proto_ident provided by 1541 * the received TransportID 1542 */ 1543 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1544 if (tmp_proto_ident != proto_ident) 1545 continue; 1546 dest_rtpi = tmp_port->sep_rtpi; 1547 1548 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1549 tmp_tpg, (const char *)ptr, &tid_len, 1550 &iport_ptr); 1551 if (!i_str) 1552 continue; 1553 1554 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1555 smp_mb__after_atomic(); 1556 spin_unlock(&dev->se_port_lock); 1557 1558 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1559 pr_err(" core_scsi3_tpg_depend_item()" 1560 " for tmp_tpg\n"); 1561 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1562 smp_mb__after_atomic(); 1563 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1564 goto out_unmap; 1565 } 1566 /* 1567 * Locate the destination initiator ACL to be registered 1568 * from the decoded fabric module specific TransportID 1569 * at *i_str. 1570 */ 1571 spin_lock_irq(&tmp_tpg->acl_node_lock); 1572 dest_node_acl = __core_tpg_get_initiator_node_acl( 1573 tmp_tpg, i_str); 1574 if (dest_node_acl) { 1575 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1576 smp_mb__after_atomic(); 1577 } 1578 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1579 1580 if (!dest_node_acl) { 1581 core_scsi3_tpg_undepend_item(tmp_tpg); 1582 spin_lock(&dev->se_port_lock); 1583 continue; 1584 } 1585 1586 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1587 pr_err("configfs_depend_item() failed" 1588 " for dest_node_acl->acl_group\n"); 1589 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1590 smp_mb__after_atomic(); 1591 core_scsi3_tpg_undepend_item(tmp_tpg); 1592 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1593 goto out_unmap; 1594 } 1595 1596 dest_tpg = tmp_tpg; 1597 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1598 " %s Port RTPI: %hu\n", 1599 dest_tpg->se_tpg_tfo->get_fabric_name(), 1600 dest_node_acl->initiatorname, dest_rtpi); 1601 1602 spin_lock(&dev->se_port_lock); 1603 break; 1604 } 1605 spin_unlock(&dev->se_port_lock); 1606 1607 if (!dest_tpg) { 1608 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1609 " dest_tpg\n"); 1610 ret = TCM_INVALID_PARAMETER_LIST; 1611 goto out_unmap; 1612 } 1613 1614 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1615 " tid_len: %d for %s + %s\n", 1616 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1617 tpdl, tid_len, i_str, iport_ptr); 1618 1619 if (tid_len > tpdl) { 1620 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1621 " %u for Transport ID: %s\n", tid_len, ptr); 1622 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1623 core_scsi3_tpg_undepend_item(dest_tpg); 1624 ret = TCM_INVALID_PARAMETER_LIST; 1625 goto out_unmap; 1626 } 1627 /* 1628 * Locate the desintation struct se_dev_entry pointer for matching 1629 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1630 * Target Port. 1631 */ 1632 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1633 dest_rtpi); 1634 if (!dest_se_deve) { 1635 pr_err("Unable to locate %s dest_se_deve" 1636 " from destination RTPI: %hu\n", 1637 dest_tpg->se_tpg_tfo->get_fabric_name(), 1638 dest_rtpi); 1639 1640 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1641 core_scsi3_tpg_undepend_item(dest_tpg); 1642 ret = TCM_INVALID_PARAMETER_LIST; 1643 goto out_unmap; 1644 } 1645 1646 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1647 pr_err("core_scsi3_lunacl_depend_item()" 1648 " failed\n"); 1649 atomic_dec(&dest_se_deve->pr_ref_count); 1650 smp_mb__after_atomic(); 1651 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1652 core_scsi3_tpg_undepend_item(dest_tpg); 1653 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1654 goto out_unmap; 1655 } 1656 1657 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1658 " dest_se_deve mapped_lun: %u\n", 1659 dest_tpg->se_tpg_tfo->get_fabric_name(), 1660 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1661 1662 /* 1663 * Skip any TransportIDs that already have a registration for 1664 * this target port. 1665 */ 1666 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1667 iport_ptr); 1668 if (pr_reg_e) { 1669 core_scsi3_put_pr_reg(pr_reg_e); 1670 core_scsi3_lunacl_undepend_item(dest_se_deve); 1671 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1672 core_scsi3_tpg_undepend_item(dest_tpg); 1673 ptr += tid_len; 1674 tpdl -= tid_len; 1675 tid_len = 0; 1676 continue; 1677 } 1678 /* 1679 * Allocate a struct pr_transport_id_holder and setup 1680 * the dest_node_acl and dest_se_deve pointers for the 1681 * loop below. 1682 */ 1683 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1684 GFP_KERNEL); 1685 if (!tidh_new) { 1686 pr_err("Unable to allocate tidh_new\n"); 1687 core_scsi3_lunacl_undepend_item(dest_se_deve); 1688 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1689 core_scsi3_tpg_undepend_item(dest_tpg); 1690 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1691 goto out_unmap; 1692 } 1693 INIT_LIST_HEAD(&tidh_new->dest_list); 1694 tidh_new->dest_tpg = dest_tpg; 1695 tidh_new->dest_node_acl = dest_node_acl; 1696 tidh_new->dest_se_deve = dest_se_deve; 1697 1698 /* 1699 * Allocate, but do NOT add the registration for the 1700 * TransportID referenced SCSI Initiator port. This 1701 * done because of the following from spc4r17 in section 1702 * 6.14.3 wrt SPEC_I_PT: 1703 * 1704 * "If a registration fails for any initiator port (e.g., if th 1705 * logical unit does not have enough resources available to 1706 * hold the registration information), no registrations shall be 1707 * made, and the command shall be terminated with 1708 * CHECK CONDITION status." 1709 * 1710 * That means we call __core_scsi3_alloc_registration() here, 1711 * and then call __core_scsi3_add_registration() in the 1712 * 2nd loop which will never fail. 1713 */ 1714 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1715 dest_node_acl, dest_se_deve, iport_ptr, 1716 sa_res_key, all_tg_pt, aptpl); 1717 if (!dest_pr_reg) { 1718 core_scsi3_lunacl_undepend_item(dest_se_deve); 1719 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1720 core_scsi3_tpg_undepend_item(dest_tpg); 1721 kfree(tidh_new); 1722 ret = TCM_INVALID_PARAMETER_LIST; 1723 goto out_unmap; 1724 } 1725 tidh_new->dest_pr_reg = dest_pr_reg; 1726 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1727 1728 ptr += tid_len; 1729 tpdl -= tid_len; 1730 tid_len = 0; 1731 1732 } 1733 1734 transport_kunmap_data_sg(cmd); 1735 1736 /* 1737 * Go ahead and create a registrations from tid_dest_list for the 1738 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1739 * and dest_se_deve. 1740 * 1741 * The SA Reservation Key from the PROUT is set for the 1742 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1743 * means that the TransportID Initiator port will be 1744 * registered on all of the target ports in the SCSI target device 1745 * ALL_TG_PT=0 means the registration will only be for the 1746 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1747 * was received. 1748 */ 1749 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1750 dest_tpg = tidh->dest_tpg; 1751 dest_node_acl = tidh->dest_node_acl; 1752 dest_se_deve = tidh->dest_se_deve; 1753 dest_pr_reg = tidh->dest_pr_reg; 1754 dest_local_nexus = tidh->dest_local_nexus; 1755 1756 list_del(&tidh->dest_list); 1757 kfree(tidh); 1758 1759 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1760 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1761 1762 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1763 dest_pr_reg, 0, 0); 1764 1765 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1766 " registered Transport ID for Node: %s%s Mapped LUN:" 1767 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1768 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun); 1769 1770 if (dest_local_nexus) 1771 continue; 1772 1773 core_scsi3_lunacl_undepend_item(dest_se_deve); 1774 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1775 core_scsi3_tpg_undepend_item(dest_tpg); 1776 } 1777 1778 return 0; 1779 out_unmap: 1780 transport_kunmap_data_sg(cmd); 1781 out: 1782 /* 1783 * For the failure case, release everything from tid_dest_list 1784 * including *dest_pr_reg and the configfs dependances.. 1785 */ 1786 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1787 dest_tpg = tidh->dest_tpg; 1788 dest_node_acl = tidh->dest_node_acl; 1789 dest_se_deve = tidh->dest_se_deve; 1790 dest_pr_reg = tidh->dest_pr_reg; 1791 dest_local_nexus = tidh->dest_local_nexus; 1792 1793 list_del(&tidh->dest_list); 1794 kfree(tidh); 1795 /* 1796 * Release any extra ALL_TG_PT=1 registrations for 1797 * the SPEC_I_PT=1 case. 1798 */ 1799 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1800 &dest_pr_reg->pr_reg_atp_list, 1801 pr_reg_atp_mem_list) { 1802 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1803 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1804 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1805 } 1806 1807 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1808 1809 if (dest_local_nexus) 1810 continue; 1811 1812 core_scsi3_lunacl_undepend_item(dest_se_deve); 1813 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1814 core_scsi3_tpg_undepend_item(dest_tpg); 1815 } 1816 return ret; 1817 } 1818 1819 static int core_scsi3_update_aptpl_buf( 1820 struct se_device *dev, 1821 unsigned char *buf, 1822 u32 pr_aptpl_buf_len) 1823 { 1824 struct se_lun *lun; 1825 struct se_portal_group *tpg; 1826 struct t10_pr_registration *pr_reg; 1827 unsigned char tmp[512], isid_buf[32]; 1828 ssize_t len = 0; 1829 int reg_count = 0; 1830 int ret = 0; 1831 1832 spin_lock(&dev->dev_reservation_lock); 1833 spin_lock(&dev->t10_pr.registration_lock); 1834 /* 1835 * Walk the registration list.. 1836 */ 1837 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1838 pr_reg_list) { 1839 1840 tmp[0] = '\0'; 1841 isid_buf[0] = '\0'; 1842 tpg = pr_reg->pr_reg_nacl->se_tpg; 1843 lun = pr_reg->pr_reg_tg_pt_lun; 1844 /* 1845 * Write out any ISID value to APTPL metadata that was included 1846 * in the original registration. 1847 */ 1848 if (pr_reg->isid_present_at_reg) 1849 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1850 pr_reg->pr_reg_isid); 1851 /* 1852 * Include special metadata if the pr_reg matches the 1853 * reservation holder. 1854 */ 1855 if (dev->dev_pr_res_holder == pr_reg) { 1856 snprintf(tmp, 512, "PR_REG_START: %d" 1857 "\ninitiator_fabric=%s\n" 1858 "initiator_node=%s\n%s" 1859 "sa_res_key=%llu\n" 1860 "res_holder=1\nres_type=%02x\n" 1861 "res_scope=%02x\nres_all_tg_pt=%d\n" 1862 "mapped_lun=%u\n", reg_count, 1863 tpg->se_tpg_tfo->get_fabric_name(), 1864 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1865 pr_reg->pr_res_key, pr_reg->pr_res_type, 1866 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1867 pr_reg->pr_res_mapped_lun); 1868 } else { 1869 snprintf(tmp, 512, "PR_REG_START: %d\n" 1870 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1871 "sa_res_key=%llu\nres_holder=0\n" 1872 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1873 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1874 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1875 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1876 pr_reg->pr_res_mapped_lun); 1877 } 1878 1879 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1880 pr_err("Unable to update renaming" 1881 " APTPL metadata\n"); 1882 ret = -EMSGSIZE; 1883 goto out; 1884 } 1885 len += sprintf(buf+len, "%s", tmp); 1886 1887 /* 1888 * Include information about the associated SCSI target port. 1889 */ 1890 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1891 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1892 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1893 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1894 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1895 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1896 1897 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1898 pr_err("Unable to update renaming" 1899 " APTPL metadata\n"); 1900 ret = -EMSGSIZE; 1901 goto out; 1902 } 1903 len += sprintf(buf+len, "%s", tmp); 1904 reg_count++; 1905 } 1906 1907 if (!reg_count) 1908 len += sprintf(buf+len, "No Registrations or Reservations"); 1909 1910 out: 1911 spin_unlock(&dev->t10_pr.registration_lock); 1912 spin_unlock(&dev->dev_reservation_lock); 1913 1914 return ret; 1915 } 1916 1917 static int __core_scsi3_write_aptpl_to_file( 1918 struct se_device *dev, 1919 unsigned char *buf) 1920 { 1921 struct t10_wwn *wwn = &dev->t10_wwn; 1922 struct file *file; 1923 int flags = O_RDWR | O_CREAT | O_TRUNC; 1924 char path[512]; 1925 u32 pr_aptpl_buf_len; 1926 int ret; 1927 1928 memset(path, 0, 512); 1929 1930 if (strlen(&wwn->unit_serial[0]) >= 512) { 1931 pr_err("WWN value for struct se_device does not fit" 1932 " into path buffer\n"); 1933 return -EMSGSIZE; 1934 } 1935 1936 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1937 file = filp_open(path, flags, 0600); 1938 if (IS_ERR(file)) { 1939 pr_err("filp_open(%s) for APTPL metadata" 1940 " failed\n", path); 1941 return PTR_ERR(file); 1942 } 1943 1944 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1945 1946 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1947 1948 if (ret < 0) 1949 pr_debug("Error writing APTPL metadata file: %s\n", path); 1950 fput(file); 1951 1952 return (ret < 0) ? -EIO : 0; 1953 } 1954 1955 /* 1956 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1957 * write out the updated metadata to struct file for this SCSI device. 1958 */ 1959 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1960 { 1961 unsigned char *buf; 1962 int rc; 1963 1964 if (!aptpl) { 1965 char *null_buf = "No Registrations or Reservations\n"; 1966 1967 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1968 dev->t10_pr.pr_aptpl_active = 0; 1969 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1970 1971 if (rc) 1972 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1973 1974 return 0; 1975 } 1976 1977 buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL); 1978 if (!buf) 1979 return TCM_OUT_OF_RESOURCES; 1980 1981 rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN); 1982 if (rc < 0) { 1983 kfree(buf); 1984 return TCM_OUT_OF_RESOURCES; 1985 } 1986 1987 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 1988 if (rc != 0) { 1989 pr_err("SPC-3 PR: Could not update APTPL\n"); 1990 kfree(buf); 1991 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1992 } 1993 dev->t10_pr.pr_aptpl_active = 1; 1994 kfree(buf); 1995 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 1996 return 0; 1997 } 1998 1999 static sense_reason_t 2000 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2001 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2002 { 2003 struct se_session *se_sess = cmd->se_sess; 2004 struct se_device *dev = cmd->se_dev; 2005 struct se_dev_entry *se_deve; 2006 struct se_lun *se_lun = cmd->se_lun; 2007 struct se_portal_group *se_tpg; 2008 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2009 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2010 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2011 sense_reason_t ret = TCM_NO_SENSE; 2012 int pr_holder = 0, type; 2013 2014 if (!se_sess || !se_lun) { 2015 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2016 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2017 } 2018 se_tpg = se_sess->se_tpg; 2019 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2020 2021 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2022 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2023 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2024 PR_REG_ISID_LEN); 2025 isid_ptr = &isid_buf[0]; 2026 } 2027 /* 2028 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2029 */ 2030 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2031 if (!pr_reg) { 2032 if (res_key) { 2033 pr_warn("SPC-3 PR: Reservation Key non-zero" 2034 " for SA REGISTER, returning CONFLICT\n"); 2035 return TCM_RESERVATION_CONFLICT; 2036 } 2037 /* 2038 * Do nothing but return GOOD status. 2039 */ 2040 if (!sa_res_key) 2041 return 0; 2042 2043 if (!spec_i_pt) { 2044 /* 2045 * Perform the Service Action REGISTER on the Initiator 2046 * Port Endpoint that the PRO was received from on the 2047 * Logical Unit of the SCSI device server. 2048 */ 2049 if (core_scsi3_alloc_registration(cmd->se_dev, 2050 se_sess->se_node_acl, se_deve, isid_ptr, 2051 sa_res_key, all_tg_pt, aptpl, 2052 register_type, 0)) { 2053 pr_err("Unable to allocate" 2054 " struct t10_pr_registration\n"); 2055 return TCM_INVALID_PARAMETER_LIST; 2056 } 2057 } else { 2058 /* 2059 * Register both the Initiator port that received 2060 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2061 * TransportID from Parameter list and loop through 2062 * fabric dependent parameter list while calling 2063 * logic from of core_scsi3_alloc_registration() for 2064 * each TransportID provided SCSI Initiator Port/Device 2065 */ 2066 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2067 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2068 if (ret != 0) 2069 return ret; 2070 } 2071 2072 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2073 } 2074 2075 /* ok, existing registration */ 2076 2077 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2078 pr_err("SPC-3 PR REGISTER: Received" 2079 " res_key: 0x%016Lx does not match" 2080 " existing SA REGISTER res_key:" 2081 " 0x%016Lx\n", res_key, 2082 pr_reg->pr_res_key); 2083 ret = TCM_RESERVATION_CONFLICT; 2084 goto out; 2085 } 2086 2087 if (spec_i_pt) { 2088 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2089 " set on a registered nexus\n"); 2090 ret = TCM_INVALID_PARAMETER_LIST; 2091 goto out; 2092 } 2093 2094 /* 2095 * An existing ALL_TG_PT=1 registration being released 2096 * must also set ALL_TG_PT=1 in the incoming PROUT. 2097 */ 2098 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2099 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2100 " registration exists, but ALL_TG_PT=1 bit not" 2101 " present in received PROUT\n"); 2102 ret = TCM_INVALID_CDB_FIELD; 2103 goto out; 2104 } 2105 2106 /* 2107 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2108 */ 2109 if (sa_res_key) { 2110 /* 2111 * Increment PRgeneration counter for struct se_device" 2112 * upon a successful REGISTER, see spc4r17 section 6.3.2 2113 * READ_KEYS service action. 2114 */ 2115 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2116 pr_reg->pr_res_key = sa_res_key; 2117 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2118 " Key for %s to: 0x%016Lx PRgeneration:" 2119 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2120 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2121 pr_reg->pr_reg_nacl->initiatorname, 2122 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2123 2124 } else { 2125 /* 2126 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2127 */ 2128 pr_holder = core_scsi3_check_implicit_release( 2129 cmd->se_dev, pr_reg); 2130 if (pr_holder < 0) { 2131 ret = TCM_RESERVATION_CONFLICT; 2132 goto out; 2133 } 2134 type = pr_reg->pr_res_type; 2135 2136 spin_lock(&pr_tmpl->registration_lock); 2137 /* 2138 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2139 * and matching pr_res_key. 2140 */ 2141 if (pr_reg->pr_reg_all_tg_pt) { 2142 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2143 &pr_tmpl->registration_list, 2144 pr_reg_list) { 2145 2146 if (!pr_reg_p->pr_reg_all_tg_pt) 2147 continue; 2148 if (pr_reg_p->pr_res_key != res_key) 2149 continue; 2150 if (pr_reg == pr_reg_p) 2151 continue; 2152 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2153 pr_reg_p->pr_reg_nacl->initiatorname)) 2154 continue; 2155 2156 __core_scsi3_free_registration(dev, 2157 pr_reg_p, NULL, 0); 2158 } 2159 } 2160 2161 /* 2162 * Release the calling I_T Nexus registration now.. 2163 */ 2164 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2165 pr_reg = NULL; 2166 2167 /* 2168 * From spc4r17, section 5.7.11.3 Unregistering 2169 * 2170 * If the persistent reservation is a registrants only 2171 * type, the device server shall establish a unit 2172 * attention condition for the initiator port associated 2173 * with every registered I_T nexus except for the I_T 2174 * nexus on which the PERSISTENT RESERVE OUT command was 2175 * received, with the additional sense code set to 2176 * RESERVATIONS RELEASED. 2177 */ 2178 if (pr_holder && 2179 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2180 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2181 list_for_each_entry(pr_reg_p, 2182 &pr_tmpl->registration_list, 2183 pr_reg_list) { 2184 2185 core_scsi3_ua_allocate( 2186 pr_reg_p->pr_reg_nacl, 2187 pr_reg_p->pr_res_mapped_lun, 2188 0x2A, 2189 ASCQ_2AH_RESERVATIONS_RELEASED); 2190 } 2191 } 2192 2193 spin_unlock(&pr_tmpl->registration_lock); 2194 } 2195 2196 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2197 2198 out: 2199 if (pr_reg) 2200 core_scsi3_put_pr_reg(pr_reg); 2201 return ret; 2202 } 2203 2204 unsigned char *core_scsi3_pr_dump_type(int type) 2205 { 2206 switch (type) { 2207 case PR_TYPE_WRITE_EXCLUSIVE: 2208 return "Write Exclusive Access"; 2209 case PR_TYPE_EXCLUSIVE_ACCESS: 2210 return "Exclusive Access"; 2211 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2212 return "Write Exclusive Access, Registrants Only"; 2213 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2214 return "Exclusive Access, Registrants Only"; 2215 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2216 return "Write Exclusive Access, All Registrants"; 2217 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2218 return "Exclusive Access, All Registrants"; 2219 default: 2220 break; 2221 } 2222 2223 return "Unknown SPC-3 PR Type"; 2224 } 2225 2226 static sense_reason_t 2227 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2228 { 2229 struct se_device *dev = cmd->se_dev; 2230 struct se_session *se_sess = cmd->se_sess; 2231 struct se_lun *se_lun = cmd->se_lun; 2232 struct t10_pr_registration *pr_reg, *pr_res_holder; 2233 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2234 char i_buf[PR_REG_ISID_ID_LEN]; 2235 sense_reason_t ret; 2236 2237 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2238 2239 if (!se_sess || !se_lun) { 2240 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2241 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2242 } 2243 /* 2244 * Locate the existing *pr_reg via struct se_node_acl pointers 2245 */ 2246 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2247 se_sess); 2248 if (!pr_reg) { 2249 pr_err("SPC-3 PR: Unable to locate" 2250 " PR_REGISTERED *pr_reg for RESERVE\n"); 2251 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2252 } 2253 /* 2254 * From spc4r17 Section 5.7.9: Reserving: 2255 * 2256 * An application client creates a persistent reservation by issuing 2257 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2258 * a registered I_T nexus with the following parameters: 2259 * a) RESERVATION KEY set to the value of the reservation key that is 2260 * registered with the logical unit for the I_T nexus; and 2261 */ 2262 if (res_key != pr_reg->pr_res_key) { 2263 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2264 " does not match existing SA REGISTER res_key:" 2265 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2266 ret = TCM_RESERVATION_CONFLICT; 2267 goto out_put_pr_reg; 2268 } 2269 /* 2270 * From spc4r17 Section 5.7.9: Reserving: 2271 * 2272 * From above: 2273 * b) TYPE field and SCOPE field set to the persistent reservation 2274 * being created. 2275 * 2276 * Only one persistent reservation is allowed at a time per logical unit 2277 * and that persistent reservation has a scope of LU_SCOPE. 2278 */ 2279 if (scope != PR_SCOPE_LU_SCOPE) { 2280 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2281 ret = TCM_INVALID_PARAMETER_LIST; 2282 goto out_put_pr_reg; 2283 } 2284 /* 2285 * See if we have an existing PR reservation holder pointer at 2286 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2287 * *pr_res_holder. 2288 */ 2289 spin_lock(&dev->dev_reservation_lock); 2290 pr_res_holder = dev->dev_pr_res_holder; 2291 if (pr_res_holder) { 2292 /* 2293 * From spc4r17 Section 5.7.9: Reserving: 2294 * 2295 * If the device server receives a PERSISTENT RESERVE OUT 2296 * command from an I_T nexus other than a persistent reservation 2297 * holder (see 5.7.10) that attempts to create a persistent 2298 * reservation when a persistent reservation already exists for 2299 * the logical unit, then the command shall be completed with 2300 * RESERVATION CONFLICT status. 2301 */ 2302 if (pr_res_holder != pr_reg) { 2303 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2304 pr_err("SPC-3 PR: Attempted RESERVE from" 2305 " [%s]: %s while reservation already held by" 2306 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2307 cmd->se_tfo->get_fabric_name(), 2308 se_sess->se_node_acl->initiatorname, 2309 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2310 pr_res_holder->pr_reg_nacl->initiatorname); 2311 2312 spin_unlock(&dev->dev_reservation_lock); 2313 ret = TCM_RESERVATION_CONFLICT; 2314 goto out_put_pr_reg; 2315 } 2316 /* 2317 * From spc4r17 Section 5.7.9: Reserving: 2318 * 2319 * If a persistent reservation holder attempts to modify the 2320 * type or scope of an existing persistent reservation, the 2321 * command shall be completed with RESERVATION CONFLICT status. 2322 */ 2323 if ((pr_res_holder->pr_res_type != type) || 2324 (pr_res_holder->pr_res_scope != scope)) { 2325 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2326 pr_err("SPC-3 PR: Attempted RESERVE from" 2327 " [%s]: %s trying to change TYPE and/or SCOPE," 2328 " while reservation already held by [%s]: %s," 2329 " returning RESERVATION_CONFLICT\n", 2330 cmd->se_tfo->get_fabric_name(), 2331 se_sess->se_node_acl->initiatorname, 2332 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2333 pr_res_holder->pr_reg_nacl->initiatorname); 2334 2335 spin_unlock(&dev->dev_reservation_lock); 2336 ret = TCM_RESERVATION_CONFLICT; 2337 goto out_put_pr_reg; 2338 } 2339 /* 2340 * From spc4r17 Section 5.7.9: Reserving: 2341 * 2342 * If the device server receives a PERSISTENT RESERVE OUT 2343 * command with RESERVE service action where the TYPE field and 2344 * the SCOPE field contain the same values as the existing type 2345 * and scope from a persistent reservation holder, it shall not 2346 * make any change to the existing persistent reservation and 2347 * shall completethe command with GOOD status. 2348 */ 2349 spin_unlock(&dev->dev_reservation_lock); 2350 ret = 0; 2351 goto out_put_pr_reg; 2352 } 2353 /* 2354 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2355 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2356 */ 2357 pr_reg->pr_res_scope = scope; 2358 pr_reg->pr_res_type = type; 2359 pr_reg->pr_res_holder = 1; 2360 dev->dev_pr_res_holder = pr_reg; 2361 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2362 2363 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2364 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2365 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2366 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2367 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2368 cmd->se_tfo->get_fabric_name(), 2369 se_sess->se_node_acl->initiatorname, 2370 i_buf); 2371 spin_unlock(&dev->dev_reservation_lock); 2372 2373 if (pr_tmpl->pr_aptpl_active) 2374 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2375 2376 ret = 0; 2377 out_put_pr_reg: 2378 core_scsi3_put_pr_reg(pr_reg); 2379 return ret; 2380 } 2381 2382 static sense_reason_t 2383 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2384 u64 res_key) 2385 { 2386 switch (type) { 2387 case PR_TYPE_WRITE_EXCLUSIVE: 2388 case PR_TYPE_EXCLUSIVE_ACCESS: 2389 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2390 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2391 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2392 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2393 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2394 default: 2395 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2396 " 0x%02x\n", type); 2397 return TCM_INVALID_CDB_FIELD; 2398 } 2399 } 2400 2401 /* 2402 * Called with struct se_device->dev_reservation_lock held. 2403 */ 2404 static void __core_scsi3_complete_pro_release( 2405 struct se_device *dev, 2406 struct se_node_acl *se_nacl, 2407 struct t10_pr_registration *pr_reg, 2408 int explicit) 2409 { 2410 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2411 char i_buf[PR_REG_ISID_ID_LEN]; 2412 2413 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2414 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2415 /* 2416 * Go ahead and release the current PR reservation holder. 2417 */ 2418 dev->dev_pr_res_holder = NULL; 2419 2420 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2421 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2422 tfo->get_fabric_name(), (explicit) ? "explicit" : "implicit", 2423 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2424 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2425 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2426 tfo->get_fabric_name(), se_nacl->initiatorname, 2427 i_buf); 2428 /* 2429 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2430 */ 2431 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2432 } 2433 2434 static sense_reason_t 2435 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2436 u64 res_key) 2437 { 2438 struct se_device *dev = cmd->se_dev; 2439 struct se_session *se_sess = cmd->se_sess; 2440 struct se_lun *se_lun = cmd->se_lun; 2441 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2442 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2443 int all_reg = 0; 2444 sense_reason_t ret = 0; 2445 2446 if (!se_sess || !se_lun) { 2447 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2448 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2449 } 2450 /* 2451 * Locate the existing *pr_reg via struct se_node_acl pointers 2452 */ 2453 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2454 if (!pr_reg) { 2455 pr_err("SPC-3 PR: Unable to locate" 2456 " PR_REGISTERED *pr_reg for RELEASE\n"); 2457 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2458 } 2459 /* 2460 * From spc4r17 Section 5.7.11.2 Releasing: 2461 * 2462 * If there is no persistent reservation or in response to a persistent 2463 * reservation release request from a registered I_T nexus that is not a 2464 * persistent reservation holder (see 5.7.10), the device server shall 2465 * do the following: 2466 * 2467 * a) Not release the persistent reservation, if any; 2468 * b) Not remove any registrations; and 2469 * c) Complete the command with GOOD status. 2470 */ 2471 spin_lock(&dev->dev_reservation_lock); 2472 pr_res_holder = dev->dev_pr_res_holder; 2473 if (!pr_res_holder) { 2474 /* 2475 * No persistent reservation, return GOOD status. 2476 */ 2477 spin_unlock(&dev->dev_reservation_lock); 2478 goto out_put_pr_reg; 2479 } 2480 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2481 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2482 all_reg = 1; 2483 2484 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2485 /* 2486 * Non 'All Registrants' PR Type cases.. 2487 * Release request from a registered I_T nexus that is not a 2488 * persistent reservation holder. return GOOD status. 2489 */ 2490 spin_unlock(&dev->dev_reservation_lock); 2491 goto out_put_pr_reg; 2492 } 2493 2494 /* 2495 * From spc4r17 Section 5.7.11.2 Releasing: 2496 * 2497 * Only the persistent reservation holder (see 5.7.10) is allowed to 2498 * release a persistent reservation. 2499 * 2500 * An application client releases the persistent reservation by issuing 2501 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2502 * an I_T nexus that is a persistent reservation holder with the 2503 * following parameters: 2504 * 2505 * a) RESERVATION KEY field set to the value of the reservation key 2506 * that is registered with the logical unit for the I_T nexus; 2507 */ 2508 if (res_key != pr_reg->pr_res_key) { 2509 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2510 " does not match existing SA REGISTER res_key:" 2511 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2512 spin_unlock(&dev->dev_reservation_lock); 2513 ret = TCM_RESERVATION_CONFLICT; 2514 goto out_put_pr_reg; 2515 } 2516 /* 2517 * From spc4r17 Section 5.7.11.2 Releasing and above: 2518 * 2519 * b) TYPE field and SCOPE field set to match the persistent 2520 * reservation being released. 2521 */ 2522 if ((pr_res_holder->pr_res_type != type) || 2523 (pr_res_holder->pr_res_scope != scope)) { 2524 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2525 pr_err("SPC-3 PR RELEASE: Attempted to release" 2526 " reservation from [%s]: %s with different TYPE " 2527 "and/or SCOPE while reservation already held by" 2528 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2529 cmd->se_tfo->get_fabric_name(), 2530 se_sess->se_node_acl->initiatorname, 2531 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2532 pr_res_holder->pr_reg_nacl->initiatorname); 2533 2534 spin_unlock(&dev->dev_reservation_lock); 2535 ret = TCM_RESERVATION_CONFLICT; 2536 goto out_put_pr_reg; 2537 } 2538 /* 2539 * In response to a persistent reservation release request from the 2540 * persistent reservation holder the device server shall perform a 2541 * release by doing the following as an uninterrupted series of actions: 2542 * a) Release the persistent reservation; 2543 * b) Not remove any registration(s); 2544 * c) If the released persistent reservation is a registrants only type 2545 * or all registrants type persistent reservation, 2546 * the device server shall establish a unit attention condition for 2547 * the initiator port associated with every regis- 2548 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2549 * RESERVE OUT command with RELEASE service action was received, 2550 * with the additional sense code set to RESERVATIONS RELEASED; and 2551 * d) If the persistent reservation is of any other type, the device 2552 * server shall not establish a unit attention condition. 2553 */ 2554 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2555 pr_reg, 1); 2556 2557 spin_unlock(&dev->dev_reservation_lock); 2558 2559 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2560 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2561 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2562 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2563 /* 2564 * If no UNIT ATTENTION conditions will be established for 2565 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2566 * go ahead and check for APTPL=1 update+write below 2567 */ 2568 goto write_aptpl; 2569 } 2570 2571 spin_lock(&pr_tmpl->registration_lock); 2572 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2573 pr_reg_list) { 2574 /* 2575 * Do not establish a UNIT ATTENTION condition 2576 * for the calling I_T Nexus 2577 */ 2578 if (pr_reg_p == pr_reg) 2579 continue; 2580 2581 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2582 pr_reg_p->pr_res_mapped_lun, 2583 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2584 } 2585 spin_unlock(&pr_tmpl->registration_lock); 2586 2587 write_aptpl: 2588 if (pr_tmpl->pr_aptpl_active) 2589 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2590 2591 out_put_pr_reg: 2592 core_scsi3_put_pr_reg(pr_reg); 2593 return ret; 2594 } 2595 2596 static sense_reason_t 2597 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2598 { 2599 struct se_device *dev = cmd->se_dev; 2600 struct se_node_acl *pr_reg_nacl; 2601 struct se_session *se_sess = cmd->se_sess; 2602 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2603 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2604 u32 pr_res_mapped_lun = 0; 2605 int calling_it_nexus = 0; 2606 /* 2607 * Locate the existing *pr_reg via struct se_node_acl pointers 2608 */ 2609 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2610 se_sess->se_node_acl, se_sess); 2611 if (!pr_reg_n) { 2612 pr_err("SPC-3 PR: Unable to locate" 2613 " PR_REGISTERED *pr_reg for CLEAR\n"); 2614 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2615 } 2616 /* 2617 * From spc4r17 section 5.7.11.6, Clearing: 2618 * 2619 * Any application client may release the persistent reservation and 2620 * remove all registrations from a device server by issuing a 2621 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2622 * registered I_T nexus with the following parameter: 2623 * 2624 * a) RESERVATION KEY field set to the value of the reservation key 2625 * that is registered with the logical unit for the I_T nexus. 2626 */ 2627 if (res_key != pr_reg_n->pr_res_key) { 2628 pr_err("SPC-3 PR REGISTER: Received" 2629 " res_key: 0x%016Lx does not match" 2630 " existing SA REGISTER res_key:" 2631 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2632 core_scsi3_put_pr_reg(pr_reg_n); 2633 return TCM_RESERVATION_CONFLICT; 2634 } 2635 /* 2636 * a) Release the persistent reservation, if any; 2637 */ 2638 spin_lock(&dev->dev_reservation_lock); 2639 pr_res_holder = dev->dev_pr_res_holder; 2640 if (pr_res_holder) { 2641 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2642 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2643 pr_res_holder, 0); 2644 } 2645 spin_unlock(&dev->dev_reservation_lock); 2646 /* 2647 * b) Remove all registration(s) (see spc4r17 5.7.7); 2648 */ 2649 spin_lock(&pr_tmpl->registration_lock); 2650 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2651 &pr_tmpl->registration_list, pr_reg_list) { 2652 2653 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2654 pr_reg_nacl = pr_reg->pr_reg_nacl; 2655 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2656 __core_scsi3_free_registration(dev, pr_reg, NULL, 2657 calling_it_nexus); 2658 /* 2659 * e) Establish a unit attention condition for the initiator 2660 * port associated with every registered I_T nexus other 2661 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2662 * command with CLEAR service action was received, with the 2663 * additional sense code set to RESERVATIONS PREEMPTED. 2664 */ 2665 if (!calling_it_nexus) 2666 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2667 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2668 } 2669 spin_unlock(&pr_tmpl->registration_lock); 2670 2671 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2672 cmd->se_tfo->get_fabric_name()); 2673 2674 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2675 2676 core_scsi3_pr_generation(dev); 2677 return 0; 2678 } 2679 2680 /* 2681 * Called with struct se_device->dev_reservation_lock held. 2682 */ 2683 static void __core_scsi3_complete_pro_preempt( 2684 struct se_device *dev, 2685 struct t10_pr_registration *pr_reg, 2686 struct list_head *preempt_and_abort_list, 2687 int type, 2688 int scope, 2689 enum preempt_type preempt_type) 2690 { 2691 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2692 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2693 char i_buf[PR_REG_ISID_ID_LEN]; 2694 2695 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2696 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2697 /* 2698 * Do an implicit RELEASE of the existing reservation. 2699 */ 2700 if (dev->dev_pr_res_holder) 2701 __core_scsi3_complete_pro_release(dev, nacl, 2702 dev->dev_pr_res_holder, 0); 2703 2704 dev->dev_pr_res_holder = pr_reg; 2705 pr_reg->pr_res_holder = 1; 2706 pr_reg->pr_res_type = type; 2707 pr_reg->pr_res_scope = scope; 2708 2709 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2710 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2711 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2712 core_scsi3_pr_dump_type(type), 2713 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2714 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2715 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2716 nacl->initiatorname, i_buf); 2717 /* 2718 * For PREEMPT_AND_ABORT, add the preempting reservation's 2719 * struct t10_pr_registration to the list that will be compared 2720 * against received CDBs.. 2721 */ 2722 if (preempt_and_abort_list) 2723 list_add_tail(&pr_reg->pr_reg_abort_list, 2724 preempt_and_abort_list); 2725 } 2726 2727 static void core_scsi3_release_preempt_and_abort( 2728 struct list_head *preempt_and_abort_list, 2729 struct t10_pr_registration *pr_reg_holder) 2730 { 2731 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2732 2733 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2734 pr_reg_abort_list) { 2735 2736 list_del(&pr_reg->pr_reg_abort_list); 2737 if (pr_reg_holder == pr_reg) 2738 continue; 2739 if (pr_reg->pr_res_holder) { 2740 pr_warn("pr_reg->pr_res_holder still set\n"); 2741 continue; 2742 } 2743 2744 pr_reg->pr_reg_deve = NULL; 2745 pr_reg->pr_reg_nacl = NULL; 2746 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2747 } 2748 } 2749 2750 static sense_reason_t 2751 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2752 u64 sa_res_key, enum preempt_type preempt_type) 2753 { 2754 struct se_device *dev = cmd->se_dev; 2755 struct se_node_acl *pr_reg_nacl; 2756 struct se_session *se_sess = cmd->se_sess; 2757 LIST_HEAD(preempt_and_abort_list); 2758 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2759 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2760 u32 pr_res_mapped_lun = 0; 2761 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 2762 int prh_type = 0, prh_scope = 0; 2763 2764 if (!se_sess) 2765 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2766 2767 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2768 se_sess); 2769 if (!pr_reg_n) { 2770 pr_err("SPC-3 PR: Unable to locate" 2771 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2772 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2773 return TCM_RESERVATION_CONFLICT; 2774 } 2775 if (pr_reg_n->pr_res_key != res_key) { 2776 core_scsi3_put_pr_reg(pr_reg_n); 2777 return TCM_RESERVATION_CONFLICT; 2778 } 2779 if (scope != PR_SCOPE_LU_SCOPE) { 2780 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2781 core_scsi3_put_pr_reg(pr_reg_n); 2782 return TCM_INVALID_PARAMETER_LIST; 2783 } 2784 2785 spin_lock(&dev->dev_reservation_lock); 2786 pr_res_holder = dev->dev_pr_res_holder; 2787 if (pr_res_holder && 2788 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2789 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2790 all_reg = 1; 2791 2792 if (!all_reg && !sa_res_key) { 2793 spin_unlock(&dev->dev_reservation_lock); 2794 core_scsi3_put_pr_reg(pr_reg_n); 2795 return TCM_INVALID_PARAMETER_LIST; 2796 } 2797 /* 2798 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2799 * 2800 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2801 * persistent reservation holder or there is no persistent reservation 2802 * holder (i.e., there is no persistent reservation), then the device 2803 * server shall perform a preempt by doing the following in an 2804 * uninterrupted series of actions. (See below..) 2805 */ 2806 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2807 /* 2808 * No existing or SA Reservation Key matching reservations.. 2809 * 2810 * PROUT SA PREEMPT with All Registrant type reservations are 2811 * allowed to be processed without a matching SA Reservation Key 2812 */ 2813 spin_lock(&pr_tmpl->registration_lock); 2814 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2815 &pr_tmpl->registration_list, pr_reg_list) { 2816 /* 2817 * Removing of registrations in non all registrants 2818 * type reservations without a matching SA reservation 2819 * key. 2820 * 2821 * a) Remove the registrations for all I_T nexuses 2822 * specified by the SERVICE ACTION RESERVATION KEY 2823 * field; 2824 * b) Ignore the contents of the SCOPE and TYPE fields; 2825 * c) Process tasks as defined in 5.7.1; and 2826 * d) Establish a unit attention condition for the 2827 * initiator port associated with every I_T nexus 2828 * that lost its registration other than the I_T 2829 * nexus on which the PERSISTENT RESERVE OUT command 2830 * was received, with the additional sense code set 2831 * to REGISTRATIONS PREEMPTED. 2832 */ 2833 if (!all_reg) { 2834 if (pr_reg->pr_res_key != sa_res_key) 2835 continue; 2836 2837 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2838 pr_reg_nacl = pr_reg->pr_reg_nacl; 2839 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2840 __core_scsi3_free_registration(dev, pr_reg, 2841 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2842 NULL, calling_it_nexus); 2843 released_regs++; 2844 } else { 2845 /* 2846 * Case for any existing all registrants type 2847 * reservation, follow logic in spc4r17 section 2848 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2849 * 2850 * For a ZERO SA Reservation key, release 2851 * all other registrations and do an implicit 2852 * release of active persistent reservation. 2853 * 2854 * For a non-ZERO SA Reservation key, only 2855 * release the matching reservation key from 2856 * registrations. 2857 */ 2858 if ((sa_res_key) && 2859 (pr_reg->pr_res_key != sa_res_key)) 2860 continue; 2861 2862 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2863 if (calling_it_nexus) 2864 continue; 2865 2866 pr_reg_nacl = pr_reg->pr_reg_nacl; 2867 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2868 __core_scsi3_free_registration(dev, pr_reg, 2869 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2870 NULL, 0); 2871 released_regs++; 2872 } 2873 if (!calling_it_nexus) 2874 core_scsi3_ua_allocate(pr_reg_nacl, 2875 pr_res_mapped_lun, 0x2A, 2876 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2877 } 2878 spin_unlock(&pr_tmpl->registration_lock); 2879 /* 2880 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2881 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2882 * RESERVATION KEY field to a value that does not match any 2883 * registered reservation key, then the device server shall 2884 * complete the command with RESERVATION CONFLICT status. 2885 */ 2886 if (!released_regs) { 2887 spin_unlock(&dev->dev_reservation_lock); 2888 core_scsi3_put_pr_reg(pr_reg_n); 2889 return TCM_RESERVATION_CONFLICT; 2890 } 2891 /* 2892 * For an existing all registrants type reservation 2893 * with a zero SA rservation key, preempt the existing 2894 * reservation with the new PR type and scope. 2895 */ 2896 if (pr_res_holder && all_reg && !(sa_res_key)) { 2897 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2898 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2899 type, scope, preempt_type); 2900 2901 if (preempt_type == PREEMPT_AND_ABORT) 2902 core_scsi3_release_preempt_and_abort( 2903 &preempt_and_abort_list, pr_reg_n); 2904 } 2905 spin_unlock(&dev->dev_reservation_lock); 2906 2907 if (pr_tmpl->pr_aptpl_active) 2908 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2909 2910 core_scsi3_put_pr_reg(pr_reg_n); 2911 core_scsi3_pr_generation(cmd->se_dev); 2912 return 0; 2913 } 2914 /* 2915 * The PREEMPTing SA reservation key matches that of the 2916 * existing persistent reservation, first, we check if 2917 * we are preempting our own reservation. 2918 * From spc4r17, section 5.7.11.4.3 Preempting 2919 * persistent reservations and registration handling 2920 * 2921 * If an all registrants persistent reservation is not 2922 * present, it is not an error for the persistent 2923 * reservation holder to preempt itself (i.e., a 2924 * PERSISTENT RESERVE OUT with a PREEMPT service action 2925 * or a PREEMPT AND ABORT service action with the 2926 * SERVICE ACTION RESERVATION KEY value equal to the 2927 * persistent reservation holder's reservation key that 2928 * is received from the persistent reservation holder). 2929 * In that case, the device server shall establish the 2930 * new persistent reservation and maintain the 2931 * registration. 2932 */ 2933 prh_type = pr_res_holder->pr_res_type; 2934 prh_scope = pr_res_holder->pr_res_scope; 2935 /* 2936 * If the SERVICE ACTION RESERVATION KEY field identifies a 2937 * persistent reservation holder (see 5.7.10), the device 2938 * server shall perform a preempt by doing the following as 2939 * an uninterrupted series of actions: 2940 * 2941 * a) Release the persistent reservation for the holder 2942 * identified by the SERVICE ACTION RESERVATION KEY field; 2943 */ 2944 if (pr_reg_n != pr_res_holder) 2945 __core_scsi3_complete_pro_release(dev, 2946 pr_res_holder->pr_reg_nacl, 2947 dev->dev_pr_res_holder, 0); 2948 /* 2949 * b) Remove the registrations for all I_T nexuses identified 2950 * by the SERVICE ACTION RESERVATION KEY field, except the 2951 * I_T nexus that is being used for the PERSISTENT RESERVE 2952 * OUT command. If an all registrants persistent reservation 2953 * is present and the SERVICE ACTION RESERVATION KEY field 2954 * is set to zero, then all registrations shall be removed 2955 * except for that of the I_T nexus that is being used for 2956 * the PERSISTENT RESERVE OUT command; 2957 */ 2958 spin_lock(&pr_tmpl->registration_lock); 2959 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2960 &pr_tmpl->registration_list, pr_reg_list) { 2961 2962 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2963 if (calling_it_nexus) 2964 continue; 2965 2966 if (pr_reg->pr_res_key != sa_res_key) 2967 continue; 2968 2969 pr_reg_nacl = pr_reg->pr_reg_nacl; 2970 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2971 __core_scsi3_free_registration(dev, pr_reg, 2972 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2973 calling_it_nexus); 2974 /* 2975 * e) Establish a unit attention condition for the initiator 2976 * port associated with every I_T nexus that lost its 2977 * persistent reservation and/or registration, with the 2978 * additional sense code set to REGISTRATIONS PREEMPTED; 2979 */ 2980 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 2981 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2982 } 2983 spin_unlock(&pr_tmpl->registration_lock); 2984 /* 2985 * c) Establish a persistent reservation for the preempting 2986 * I_T nexus using the contents of the SCOPE and TYPE fields; 2987 */ 2988 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2989 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2990 type, scope, preempt_type); 2991 /* 2992 * d) Process tasks as defined in 5.7.1; 2993 * e) See above.. 2994 * f) If the type or scope has changed, then for every I_T nexus 2995 * whose reservation key was not removed, except for the I_T 2996 * nexus on which the PERSISTENT RESERVE OUT command was 2997 * received, the device server shall establish a unit 2998 * attention condition for the initiator port associated with 2999 * that I_T nexus, with the additional sense code set to 3000 * RESERVATIONS RELEASED. If the type or scope have not 3001 * changed, then no unit attention condition(s) shall be 3002 * established for this reason. 3003 */ 3004 if ((prh_type != type) || (prh_scope != scope)) { 3005 spin_lock(&pr_tmpl->registration_lock); 3006 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3007 &pr_tmpl->registration_list, pr_reg_list) { 3008 3009 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3010 if (calling_it_nexus) 3011 continue; 3012 3013 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3014 pr_reg->pr_res_mapped_lun, 0x2A, 3015 ASCQ_2AH_RESERVATIONS_RELEASED); 3016 } 3017 spin_unlock(&pr_tmpl->registration_lock); 3018 } 3019 spin_unlock(&dev->dev_reservation_lock); 3020 /* 3021 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3022 * All received CDBs for the matching existing reservation and 3023 * registrations undergo ABORT_TASK logic. 3024 * 3025 * From there, core_scsi3_release_preempt_and_abort() will 3026 * release every registration in the list (which have already 3027 * been removed from the primary pr_reg list), except the 3028 * new persistent reservation holder, the calling Initiator Port. 3029 */ 3030 if (preempt_type == PREEMPT_AND_ABORT) { 3031 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3032 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3033 pr_reg_n); 3034 } 3035 3036 if (pr_tmpl->pr_aptpl_active) 3037 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3038 3039 core_scsi3_put_pr_reg(pr_reg_n); 3040 core_scsi3_pr_generation(cmd->se_dev); 3041 return 0; 3042 } 3043 3044 static sense_reason_t 3045 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3046 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3047 { 3048 switch (type) { 3049 case PR_TYPE_WRITE_EXCLUSIVE: 3050 case PR_TYPE_EXCLUSIVE_ACCESS: 3051 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3052 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3053 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3054 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3055 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3056 sa_res_key, preempt_type); 3057 default: 3058 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3059 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3060 return TCM_INVALID_CDB_FIELD; 3061 } 3062 } 3063 3064 3065 static sense_reason_t 3066 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3067 u64 sa_res_key, int aptpl, int unreg) 3068 { 3069 struct se_session *se_sess = cmd->se_sess; 3070 struct se_device *dev = cmd->se_dev; 3071 struct se_dev_entry *dest_se_deve = NULL; 3072 struct se_lun *se_lun = cmd->se_lun; 3073 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3074 struct se_port *se_port; 3075 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3076 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3077 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3078 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3079 unsigned char *buf; 3080 unsigned char *initiator_str; 3081 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3082 u32 tid_len, tmp_tid_len; 3083 int new_reg = 0, type, scope, matching_iname; 3084 sense_reason_t ret; 3085 unsigned short rtpi; 3086 unsigned char proto_ident; 3087 3088 if (!se_sess || !se_lun) { 3089 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3090 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3091 } 3092 3093 memset(dest_iport, 0, 64); 3094 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3095 se_tpg = se_sess->se_tpg; 3096 tf_ops = se_tpg->se_tpg_tfo; 3097 /* 3098 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3099 * Register behaviors for a REGISTER AND MOVE service action 3100 * 3101 * Locate the existing *pr_reg via struct se_node_acl pointers 3102 */ 3103 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3104 se_sess); 3105 if (!pr_reg) { 3106 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3107 " *pr_reg for REGISTER_AND_MOVE\n"); 3108 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3109 } 3110 /* 3111 * The provided reservation key much match the existing reservation key 3112 * provided during this initiator's I_T nexus registration. 3113 */ 3114 if (res_key != pr_reg->pr_res_key) { 3115 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3116 " res_key: 0x%016Lx does not match existing SA REGISTER" 3117 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3118 ret = TCM_RESERVATION_CONFLICT; 3119 goto out_put_pr_reg; 3120 } 3121 /* 3122 * The service active reservation key needs to be non zero 3123 */ 3124 if (!sa_res_key) { 3125 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3126 " sa_res_key\n"); 3127 ret = TCM_INVALID_PARAMETER_LIST; 3128 goto out_put_pr_reg; 3129 } 3130 3131 /* 3132 * Determine the Relative Target Port Identifier where the reservation 3133 * will be moved to for the TransportID containing SCSI initiator WWN 3134 * information. 3135 */ 3136 buf = transport_kmap_data_sg(cmd); 3137 if (!buf) { 3138 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3139 goto out_put_pr_reg; 3140 } 3141 3142 rtpi = (buf[18] & 0xff) << 8; 3143 rtpi |= buf[19] & 0xff; 3144 tid_len = (buf[20] & 0xff) << 24; 3145 tid_len |= (buf[21] & 0xff) << 16; 3146 tid_len |= (buf[22] & 0xff) << 8; 3147 tid_len |= buf[23] & 0xff; 3148 transport_kunmap_data_sg(cmd); 3149 buf = NULL; 3150 3151 if ((tid_len + 24) != cmd->data_length) { 3152 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3153 " does not equal CDB data_length: %u\n", tid_len, 3154 cmd->data_length); 3155 ret = TCM_INVALID_PARAMETER_LIST; 3156 goto out_put_pr_reg; 3157 } 3158 3159 spin_lock(&dev->se_port_lock); 3160 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3161 if (se_port->sep_rtpi != rtpi) 3162 continue; 3163 dest_se_tpg = se_port->sep_tpg; 3164 if (!dest_se_tpg) 3165 continue; 3166 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3167 if (!dest_tf_ops) 3168 continue; 3169 3170 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3171 smp_mb__after_atomic(); 3172 spin_unlock(&dev->se_port_lock); 3173 3174 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3175 pr_err("core_scsi3_tpg_depend_item() failed" 3176 " for dest_se_tpg\n"); 3177 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3178 smp_mb__after_atomic(); 3179 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3180 goto out_put_pr_reg; 3181 } 3182 3183 spin_lock(&dev->se_port_lock); 3184 break; 3185 } 3186 spin_unlock(&dev->se_port_lock); 3187 3188 if (!dest_se_tpg || !dest_tf_ops) { 3189 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3190 " fabric ops from Relative Target Port Identifier:" 3191 " %hu\n", rtpi); 3192 ret = TCM_INVALID_PARAMETER_LIST; 3193 goto out_put_pr_reg; 3194 } 3195 3196 buf = transport_kmap_data_sg(cmd); 3197 if (!buf) { 3198 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3199 goto out_put_pr_reg; 3200 } 3201 proto_ident = (buf[24] & 0x0f); 3202 3203 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3204 " 0x%02x\n", proto_ident); 3205 3206 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3207 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3208 " proto_ident: 0x%02x does not match ident: 0x%02x" 3209 " from fabric: %s\n", proto_ident, 3210 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3211 dest_tf_ops->get_fabric_name()); 3212 ret = TCM_INVALID_PARAMETER_LIST; 3213 goto out; 3214 } 3215 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3216 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3217 " containg a valid tpg_parse_pr_out_transport_id" 3218 " function pointer\n"); 3219 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3220 goto out; 3221 } 3222 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3223 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3224 if (!initiator_str) { 3225 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3226 " initiator_str from Transport ID\n"); 3227 ret = TCM_INVALID_PARAMETER_LIST; 3228 goto out; 3229 } 3230 3231 transport_kunmap_data_sg(cmd); 3232 buf = NULL; 3233 3234 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3235 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3236 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3237 iport_ptr : ""); 3238 /* 3239 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3240 * action specifies a TransportID that is the same as the initiator port 3241 * of the I_T nexus for the command received, then the command shall 3242 * be terminated with CHECK CONDITION status, with the sense key set to 3243 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3244 * IN PARAMETER LIST. 3245 */ 3246 pr_reg_nacl = pr_reg->pr_reg_nacl; 3247 matching_iname = (!strcmp(initiator_str, 3248 pr_reg_nacl->initiatorname)) ? 1 : 0; 3249 if (!matching_iname) 3250 goto after_iport_check; 3251 3252 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3253 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3254 " matches: %s on received I_T Nexus\n", initiator_str, 3255 pr_reg_nacl->initiatorname); 3256 ret = TCM_INVALID_PARAMETER_LIST; 3257 goto out; 3258 } 3259 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3261 " matches: %s %s on received I_T Nexus\n", 3262 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3263 pr_reg->pr_reg_isid); 3264 ret = TCM_INVALID_PARAMETER_LIST; 3265 goto out; 3266 } 3267 after_iport_check: 3268 /* 3269 * Locate the destination struct se_node_acl from the received Transport ID 3270 */ 3271 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3272 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3273 initiator_str); 3274 if (dest_node_acl) { 3275 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3276 smp_mb__after_atomic(); 3277 } 3278 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3279 3280 if (!dest_node_acl) { 3281 pr_err("Unable to locate %s dest_node_acl for" 3282 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3283 initiator_str); 3284 ret = TCM_INVALID_PARAMETER_LIST; 3285 goto out; 3286 } 3287 3288 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3289 pr_err("core_scsi3_nodeacl_depend_item() for" 3290 " dest_node_acl\n"); 3291 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3292 smp_mb__after_atomic(); 3293 dest_node_acl = NULL; 3294 ret = TCM_INVALID_PARAMETER_LIST; 3295 goto out; 3296 } 3297 3298 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3299 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3300 dest_node_acl->initiatorname); 3301 3302 /* 3303 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3304 * PORT IDENTIFIER. 3305 */ 3306 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3307 if (!dest_se_deve) { 3308 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3309 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3310 ret = TCM_INVALID_PARAMETER_LIST; 3311 goto out; 3312 } 3313 3314 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3315 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3316 atomic_dec(&dest_se_deve->pr_ref_count); 3317 smp_mb__after_atomic(); 3318 dest_se_deve = NULL; 3319 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3320 goto out; 3321 } 3322 3323 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3324 " ACL for dest_se_deve->mapped_lun: %u\n", 3325 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3326 dest_se_deve->mapped_lun); 3327 3328 /* 3329 * A persistent reservation needs to already existing in order to 3330 * successfully complete the REGISTER_AND_MOVE service action.. 3331 */ 3332 spin_lock(&dev->dev_reservation_lock); 3333 pr_res_holder = dev->dev_pr_res_holder; 3334 if (!pr_res_holder) { 3335 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3336 " currently held\n"); 3337 spin_unlock(&dev->dev_reservation_lock); 3338 ret = TCM_INVALID_CDB_FIELD; 3339 goto out; 3340 } 3341 /* 3342 * The received on I_T Nexus must be the reservation holder. 3343 * 3344 * From spc4r17 section 5.7.8 Table 50 -- 3345 * Register behaviors for a REGISTER AND MOVE service action 3346 */ 3347 if (pr_res_holder != pr_reg) { 3348 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3349 " Nexus is not reservation holder\n"); 3350 spin_unlock(&dev->dev_reservation_lock); 3351 ret = TCM_RESERVATION_CONFLICT; 3352 goto out; 3353 } 3354 /* 3355 * From spc4r17 section 5.7.8: registering and moving reservation 3356 * 3357 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3358 * action is received and the established persistent reservation is a 3359 * Write Exclusive - All Registrants type or Exclusive Access - 3360 * All Registrants type reservation, then the command shall be completed 3361 * with RESERVATION CONFLICT status. 3362 */ 3363 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3364 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3365 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3366 " reservation for type: %s\n", 3367 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3368 spin_unlock(&dev->dev_reservation_lock); 3369 ret = TCM_RESERVATION_CONFLICT; 3370 goto out; 3371 } 3372 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3373 /* 3374 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3375 */ 3376 type = pr_res_holder->pr_res_type; 3377 scope = pr_res_holder->pr_res_type; 3378 /* 3379 * c) Associate the reservation key specified in the SERVICE ACTION 3380 * RESERVATION KEY field with the I_T nexus specified as the 3381 * destination of the register and move, where: 3382 * A) The I_T nexus is specified by the TransportID and the 3383 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3384 * B) Regardless of the TransportID format used, the association for 3385 * the initiator port is based on either the initiator port name 3386 * (see 3.1.71) on SCSI transport protocols where port names are 3387 * required or the initiator port identifier (see 3.1.70) on SCSI 3388 * transport protocols where port names are not required; 3389 * d) Register the reservation key specified in the SERVICE ACTION 3390 * RESERVATION KEY field; 3391 * e) Retain the reservation key specified in the SERVICE ACTION 3392 * RESERVATION KEY field and associated information; 3393 * 3394 * Also, It is not an error for a REGISTER AND MOVE service action to 3395 * register an I_T nexus that is already registered with the same 3396 * reservation key or a different reservation key. 3397 */ 3398 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3399 iport_ptr); 3400 if (!dest_pr_reg) { 3401 if (core_scsi3_alloc_registration(cmd->se_dev, 3402 dest_node_acl, dest_se_deve, iport_ptr, 3403 sa_res_key, 0, aptpl, 2, 1)) { 3404 spin_unlock(&dev->dev_reservation_lock); 3405 ret = TCM_INVALID_PARAMETER_LIST; 3406 goto out; 3407 } 3408 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3409 iport_ptr); 3410 new_reg = 1; 3411 } 3412 /* 3413 * f) Release the persistent reservation for the persistent reservation 3414 * holder (i.e., the I_T nexus on which the 3415 */ 3416 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3417 dev->dev_pr_res_holder, 0); 3418 /* 3419 * g) Move the persistent reservation to the specified I_T nexus using 3420 * the same scope and type as the persistent reservation released in 3421 * item f); and 3422 */ 3423 dev->dev_pr_res_holder = dest_pr_reg; 3424 dest_pr_reg->pr_res_holder = 1; 3425 dest_pr_reg->pr_res_type = type; 3426 pr_reg->pr_res_scope = scope; 3427 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3428 /* 3429 * Increment PRGeneration for existing registrations.. 3430 */ 3431 if (!new_reg) 3432 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3433 spin_unlock(&dev->dev_reservation_lock); 3434 3435 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3436 " created new reservation holder TYPE: %s on object RTPI:" 3437 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3438 core_scsi3_pr_dump_type(type), rtpi, 3439 dest_pr_reg->pr_res_generation); 3440 pr_debug("SPC-3 PR Successfully moved reservation from" 3441 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3442 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3443 i_buf, dest_tf_ops->get_fabric_name(), 3444 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3445 iport_ptr : ""); 3446 /* 3447 * It is now safe to release configfs group dependencies for destination 3448 * of Transport ID Initiator Device/Port Identifier 3449 */ 3450 core_scsi3_lunacl_undepend_item(dest_se_deve); 3451 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3452 core_scsi3_tpg_undepend_item(dest_se_tpg); 3453 /* 3454 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3455 * nexus on which PERSISTENT RESERVE OUT command was received. 3456 */ 3457 if (unreg) { 3458 spin_lock(&pr_tmpl->registration_lock); 3459 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3460 spin_unlock(&pr_tmpl->registration_lock); 3461 } else 3462 core_scsi3_put_pr_reg(pr_reg); 3463 3464 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3465 3466 transport_kunmap_data_sg(cmd); 3467 3468 core_scsi3_put_pr_reg(dest_pr_reg); 3469 return 0; 3470 out: 3471 if (buf) 3472 transport_kunmap_data_sg(cmd); 3473 if (dest_se_deve) 3474 core_scsi3_lunacl_undepend_item(dest_se_deve); 3475 if (dest_node_acl) 3476 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3477 core_scsi3_tpg_undepend_item(dest_se_tpg); 3478 3479 out_put_pr_reg: 3480 core_scsi3_put_pr_reg(pr_reg); 3481 return ret; 3482 } 3483 3484 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3485 { 3486 unsigned int __v1, __v2; 3487 3488 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3489 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3490 3491 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3492 } 3493 3494 /* 3495 * See spc4r17 section 6.14 Table 170 3496 */ 3497 sense_reason_t 3498 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3499 { 3500 unsigned char *cdb = &cmd->t_task_cdb[0]; 3501 unsigned char *buf; 3502 u64 res_key, sa_res_key; 3503 int sa, scope, type, aptpl; 3504 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3505 sense_reason_t ret; 3506 3507 /* 3508 * Following spc2r20 5.5.1 Reservations overview: 3509 * 3510 * If a logical unit has been reserved by any RESERVE command and is 3511 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3512 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3513 * initiator or service action and shall terminate with a RESERVATION 3514 * CONFLICT status. 3515 */ 3516 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3517 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3518 " SPC-2 reservation is held, returning" 3519 " RESERVATION_CONFLICT\n"); 3520 return TCM_RESERVATION_CONFLICT; 3521 } 3522 3523 /* 3524 * FIXME: A NULL struct se_session pointer means an this is not coming from 3525 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3526 */ 3527 if (!cmd->se_sess) 3528 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3529 3530 if (cmd->data_length < 24) { 3531 pr_warn("SPC-PR: Received PR OUT parameter list" 3532 " length too small: %u\n", cmd->data_length); 3533 return TCM_INVALID_PARAMETER_LIST; 3534 } 3535 3536 /* 3537 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3538 */ 3539 sa = (cdb[1] & 0x1f); 3540 scope = (cdb[2] & 0xf0); 3541 type = (cdb[2] & 0x0f); 3542 3543 buf = transport_kmap_data_sg(cmd); 3544 if (!buf) 3545 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3546 3547 /* 3548 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3549 */ 3550 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3551 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3552 /* 3553 * REGISTER_AND_MOVE uses a different SA parameter list containing 3554 * SCSI TransportIDs. 3555 */ 3556 if (sa != PRO_REGISTER_AND_MOVE) { 3557 spec_i_pt = (buf[20] & 0x08); 3558 all_tg_pt = (buf[20] & 0x04); 3559 aptpl = (buf[20] & 0x01); 3560 } else { 3561 aptpl = (buf[17] & 0x01); 3562 unreg = (buf[17] & 0x02); 3563 } 3564 transport_kunmap_data_sg(cmd); 3565 buf = NULL; 3566 3567 /* 3568 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3569 */ 3570 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3571 return TCM_INVALID_PARAMETER_LIST; 3572 3573 /* 3574 * From spc4r17 section 6.14: 3575 * 3576 * If the SPEC_I_PT bit is set to zero, the service action is not 3577 * REGISTER AND MOVE, and the parameter list length is not 24, then 3578 * the command shall be terminated with CHECK CONDITION status, with 3579 * the sense key set to ILLEGAL REQUEST, and the additional sense 3580 * code set to PARAMETER LIST LENGTH ERROR. 3581 */ 3582 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3583 (cmd->data_length != 24)) { 3584 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3585 " list length: %u\n", cmd->data_length); 3586 return TCM_INVALID_PARAMETER_LIST; 3587 } 3588 3589 /* 3590 * (core_scsi3_emulate_pro_* function parameters 3591 * are defined by spc4r17 Table 174: 3592 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3593 */ 3594 switch (sa) { 3595 case PRO_REGISTER: 3596 ret = core_scsi3_emulate_pro_register(cmd, 3597 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3598 break; 3599 case PRO_RESERVE: 3600 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3601 break; 3602 case PRO_RELEASE: 3603 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3604 break; 3605 case PRO_CLEAR: 3606 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3607 break; 3608 case PRO_PREEMPT: 3609 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3610 res_key, sa_res_key, PREEMPT); 3611 break; 3612 case PRO_PREEMPT_AND_ABORT: 3613 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3614 res_key, sa_res_key, PREEMPT_AND_ABORT); 3615 break; 3616 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3617 ret = core_scsi3_emulate_pro_register(cmd, 3618 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3619 break; 3620 case PRO_REGISTER_AND_MOVE: 3621 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3622 sa_res_key, aptpl, unreg); 3623 break; 3624 default: 3625 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3626 " action: 0x%02x\n", cdb[1] & 0x1f); 3627 return TCM_INVALID_CDB_FIELD; 3628 } 3629 3630 if (!ret) 3631 target_complete_cmd(cmd, GOOD); 3632 return ret; 3633 } 3634 3635 /* 3636 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3637 * 3638 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3639 */ 3640 static sense_reason_t 3641 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3642 { 3643 struct se_device *dev = cmd->se_dev; 3644 struct t10_pr_registration *pr_reg; 3645 unsigned char *buf; 3646 u32 add_len = 0, off = 8; 3647 3648 if (cmd->data_length < 8) { 3649 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3650 " too small\n", cmd->data_length); 3651 return TCM_INVALID_CDB_FIELD; 3652 } 3653 3654 buf = transport_kmap_data_sg(cmd); 3655 if (!buf) 3656 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3657 3658 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3659 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3660 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3661 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3662 3663 spin_lock(&dev->t10_pr.registration_lock); 3664 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3665 pr_reg_list) { 3666 /* 3667 * Check for overflow of 8byte PRI READ_KEYS payload and 3668 * next reservation key list descriptor. 3669 */ 3670 if ((add_len + 8) > (cmd->data_length - 8)) 3671 break; 3672 3673 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3674 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3675 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3676 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3677 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3678 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3679 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3680 buf[off++] = (pr_reg->pr_res_key & 0xff); 3681 3682 add_len += 8; 3683 } 3684 spin_unlock(&dev->t10_pr.registration_lock); 3685 3686 buf[4] = ((add_len >> 24) & 0xff); 3687 buf[5] = ((add_len >> 16) & 0xff); 3688 buf[6] = ((add_len >> 8) & 0xff); 3689 buf[7] = (add_len & 0xff); 3690 3691 transport_kunmap_data_sg(cmd); 3692 3693 return 0; 3694 } 3695 3696 /* 3697 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3698 * 3699 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3700 */ 3701 static sense_reason_t 3702 core_scsi3_pri_read_reservation(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 u64 pr_res_key; 3708 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3709 3710 if (cmd->data_length < 8) { 3711 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3712 " too small\n", cmd->data_length); 3713 return TCM_INVALID_CDB_FIELD; 3714 } 3715 3716 buf = transport_kmap_data_sg(cmd); 3717 if (!buf) 3718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3719 3720 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3721 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3722 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3723 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3724 3725 spin_lock(&dev->dev_reservation_lock); 3726 pr_reg = dev->dev_pr_res_holder; 3727 if (pr_reg) { 3728 /* 3729 * Set the hardcoded Additional Length 3730 */ 3731 buf[4] = ((add_len >> 24) & 0xff); 3732 buf[5] = ((add_len >> 16) & 0xff); 3733 buf[6] = ((add_len >> 8) & 0xff); 3734 buf[7] = (add_len & 0xff); 3735 3736 if (cmd->data_length < 22) 3737 goto err; 3738 3739 /* 3740 * Set the Reservation key. 3741 * 3742 * From spc4r17, section 5.7.10: 3743 * A persistent reservation holder has its reservation key 3744 * returned in the parameter data from a PERSISTENT 3745 * RESERVE IN command with READ RESERVATION service action as 3746 * follows: 3747 * a) For a persistent reservation of the type Write Exclusive 3748 * - All Registrants or Exclusive Access All Regitrants, 3749 * the reservation key shall be set to zero; or 3750 * b) For all other persistent reservation types, the 3751 * reservation key shall be set to the registered 3752 * reservation key for the I_T nexus that holds the 3753 * persistent reservation. 3754 */ 3755 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3756 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3757 pr_res_key = 0; 3758 else 3759 pr_res_key = pr_reg->pr_res_key; 3760 3761 buf[8] = ((pr_res_key >> 56) & 0xff); 3762 buf[9] = ((pr_res_key >> 48) & 0xff); 3763 buf[10] = ((pr_res_key >> 40) & 0xff); 3764 buf[11] = ((pr_res_key >> 32) & 0xff); 3765 buf[12] = ((pr_res_key >> 24) & 0xff); 3766 buf[13] = ((pr_res_key >> 16) & 0xff); 3767 buf[14] = ((pr_res_key >> 8) & 0xff); 3768 buf[15] = (pr_res_key & 0xff); 3769 /* 3770 * Set the SCOPE and TYPE 3771 */ 3772 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3773 (pr_reg->pr_res_type & 0x0f); 3774 } 3775 3776 err: 3777 spin_unlock(&dev->dev_reservation_lock); 3778 transport_kunmap_data_sg(cmd); 3779 3780 return 0; 3781 } 3782 3783 /* 3784 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3785 * 3786 * See spc4r17 section 6.13.4 Table 165 3787 */ 3788 static sense_reason_t 3789 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3790 { 3791 struct se_device *dev = cmd->se_dev; 3792 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3793 unsigned char *buf; 3794 u16 add_len = 8; /* Hardcoded to 8. */ 3795 3796 if (cmd->data_length < 6) { 3797 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3798 " %u too small\n", cmd->data_length); 3799 return TCM_INVALID_CDB_FIELD; 3800 } 3801 3802 buf = transport_kmap_data_sg(cmd); 3803 if (!buf) 3804 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3805 3806 buf[0] = ((add_len << 8) & 0xff); 3807 buf[1] = (add_len & 0xff); 3808 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3809 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3810 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3811 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3812 /* 3813 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3814 * set the TMV: Task Mask Valid bit. 3815 */ 3816 buf[3] |= 0x80; 3817 /* 3818 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3819 */ 3820 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3821 /* 3822 * PTPL_A: Persistence across Target Power Loss Active bit 3823 */ 3824 if (pr_tmpl->pr_aptpl_active) 3825 buf[3] |= 0x01; 3826 /* 3827 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3828 */ 3829 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3830 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3831 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3832 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3833 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3834 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3835 3836 transport_kunmap_data_sg(cmd); 3837 3838 return 0; 3839 } 3840 3841 /* 3842 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3843 * 3844 * See spc4r17 section 6.13.5 Table 168 and 169 3845 */ 3846 static sense_reason_t 3847 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3848 { 3849 struct se_device *dev = cmd->se_dev; 3850 struct se_node_acl *se_nacl; 3851 struct se_portal_group *se_tpg; 3852 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3853 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3854 unsigned char *buf; 3855 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3856 u32 off = 8; /* off into first Full Status descriptor */ 3857 int format_code = 0; 3858 3859 if (cmd->data_length < 8) { 3860 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3861 " too small\n", cmd->data_length); 3862 return TCM_INVALID_CDB_FIELD; 3863 } 3864 3865 buf = transport_kmap_data_sg(cmd); 3866 if (!buf) 3867 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3868 3869 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3870 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3871 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3872 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3873 3874 spin_lock(&pr_tmpl->registration_lock); 3875 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3876 &pr_tmpl->registration_list, pr_reg_list) { 3877 3878 se_nacl = pr_reg->pr_reg_nacl; 3879 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3880 add_desc_len = 0; 3881 3882 atomic_inc(&pr_reg->pr_res_holders); 3883 smp_mb__after_atomic(); 3884 spin_unlock(&pr_tmpl->registration_lock); 3885 /* 3886 * Determine expected length of $FABRIC_MOD specific 3887 * TransportID full status descriptor.. 3888 */ 3889 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3890 se_tpg, se_nacl, pr_reg, &format_code); 3891 3892 if ((exp_desc_len + add_len) > cmd->data_length) { 3893 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3894 " out of buffer: %d\n", cmd->data_length); 3895 spin_lock(&pr_tmpl->registration_lock); 3896 atomic_dec(&pr_reg->pr_res_holders); 3897 smp_mb__after_atomic(); 3898 break; 3899 } 3900 /* 3901 * Set RESERVATION KEY 3902 */ 3903 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3904 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3905 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3906 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3907 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3908 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3909 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3910 buf[off++] = (pr_reg->pr_res_key & 0xff); 3911 off += 4; /* Skip Over Reserved area */ 3912 3913 /* 3914 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3915 */ 3916 if (pr_reg->pr_reg_all_tg_pt) 3917 buf[off] = 0x02; 3918 /* 3919 * The struct se_lun pointer will be present for the 3920 * reservation holder for PR_HOLDER bit. 3921 * 3922 * Also, if this registration is the reservation 3923 * holder, fill in SCOPE and TYPE in the next byte. 3924 */ 3925 if (pr_reg->pr_res_holder) { 3926 buf[off++] |= 0x01; 3927 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3928 (pr_reg->pr_res_type & 0x0f); 3929 } else 3930 off += 2; 3931 3932 off += 4; /* Skip over reserved area */ 3933 /* 3934 * From spc4r17 6.3.15: 3935 * 3936 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3937 * IDENTIFIER field contains the relative port identifier (see 3938 * 3.1.120) of the target port that is part of the I_T nexus 3939 * described by this full status descriptor. If the ALL_TG_PT 3940 * bit is set to one, the contents of the RELATIVE TARGET PORT 3941 * IDENTIFIER field are not defined by this standard. 3942 */ 3943 if (!pr_reg->pr_reg_all_tg_pt) { 3944 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 3945 3946 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 3947 buf[off++] = (port->sep_rtpi & 0xff); 3948 } else 3949 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3950 3951 /* 3952 * Now, have the $FABRIC_MOD fill in the protocol identifier 3953 */ 3954 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 3955 se_nacl, pr_reg, &format_code, &buf[off+4]); 3956 3957 spin_lock(&pr_tmpl->registration_lock); 3958 atomic_dec(&pr_reg->pr_res_holders); 3959 smp_mb__after_atomic(); 3960 /* 3961 * Set the ADDITIONAL DESCRIPTOR LENGTH 3962 */ 3963 buf[off++] = ((desc_len >> 24) & 0xff); 3964 buf[off++] = ((desc_len >> 16) & 0xff); 3965 buf[off++] = ((desc_len >> 8) & 0xff); 3966 buf[off++] = (desc_len & 0xff); 3967 /* 3968 * Size of full desctipor header minus TransportID 3969 * containing $FABRIC_MOD specific) initiator device/port 3970 * WWN information. 3971 * 3972 * See spc4r17 Section 6.13.5 Table 169 3973 */ 3974 add_desc_len = (24 + desc_len); 3975 3976 off += desc_len; 3977 add_len += add_desc_len; 3978 } 3979 spin_unlock(&pr_tmpl->registration_lock); 3980 /* 3981 * Set ADDITIONAL_LENGTH 3982 */ 3983 buf[4] = ((add_len >> 24) & 0xff); 3984 buf[5] = ((add_len >> 16) & 0xff); 3985 buf[6] = ((add_len >> 8) & 0xff); 3986 buf[7] = (add_len & 0xff); 3987 3988 transport_kunmap_data_sg(cmd); 3989 3990 return 0; 3991 } 3992 3993 sense_reason_t 3994 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 3995 { 3996 sense_reason_t ret; 3997 3998 /* 3999 * Following spc2r20 5.5.1 Reservations overview: 4000 * 4001 * If a logical unit has been reserved by any RESERVE command and is 4002 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4003 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4004 * initiator or service action and shall terminate with a RESERVATION 4005 * CONFLICT status. 4006 */ 4007 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4008 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4009 " SPC-2 reservation is held, returning" 4010 " RESERVATION_CONFLICT\n"); 4011 return TCM_RESERVATION_CONFLICT; 4012 } 4013 4014 switch (cmd->t_task_cdb[1] & 0x1f) { 4015 case PRI_READ_KEYS: 4016 ret = core_scsi3_pri_read_keys(cmd); 4017 break; 4018 case PRI_READ_RESERVATION: 4019 ret = core_scsi3_pri_read_reservation(cmd); 4020 break; 4021 case PRI_REPORT_CAPABILITIES: 4022 ret = core_scsi3_pri_report_capabilities(cmd); 4023 break; 4024 case PRI_READ_FULL_STATUS: 4025 ret = core_scsi3_pri_read_full_status(cmd); 4026 break; 4027 default: 4028 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4029 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4030 return TCM_INVALID_CDB_FIELD; 4031 } 4032 4033 if (!ret) 4034 target_complete_cmd(cmd, GOOD); 4035 return ret; 4036 } 4037 4038 sense_reason_t 4039 target_check_reservation(struct se_cmd *cmd) 4040 { 4041 struct se_device *dev = cmd->se_dev; 4042 sense_reason_t ret; 4043 4044 if (!cmd->se_sess) 4045 return 0; 4046 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4047 return 0; 4048 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 4049 return 0; 4050 4051 spin_lock(&dev->dev_reservation_lock); 4052 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4053 ret = target_scsi2_reservation_check(cmd); 4054 else 4055 ret = target_scsi3_pr_reservation_check(cmd); 4056 spin_unlock(&dev->dev_reservation_lock); 4057 4058 return ret; 4059 } 4060