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1// SPDX-License-Identifier: GPL-2.0-or-later2/*******************************************************************************3 * Filename: target_core_pr.c4 *5 * This file contains SPC-3 compliant persistent reservations and6 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)7 *8 * (c) Copyright 2009-2013 Datera, Inc.9 *10 * Nicholas A. Bellinger <nab@kernel.org>11 *12 ******************************************************************************/13 14#include <linux/slab.h>15#include <linux/spinlock.h>16#include <linux/list.h>17#include <linux/vmalloc.h>18#include <linux/file.h>19#include <linux/fcntl.h>20#include <linux/fs.h>21#include <scsi/scsi_proto.h>22#include <linux/unaligned.h>23 24#include <target/target_core_base.h>25#include <target/target_core_backend.h>26#include <target/target_core_fabric.h>27 28#include "target_core_internal.h"29#include "target_core_pr.h"30#include "target_core_ua.h"31 32/*33 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)34 */35struct pr_transport_id_holder {36 struct t10_pr_registration *dest_pr_reg;37 struct se_portal_group *dest_tpg;38 struct se_node_acl *dest_node_acl;39 struct se_dev_entry *dest_se_deve;40 struct list_head dest_list;41};42 43void core_pr_dump_initiator_port(44 struct t10_pr_registration *pr_reg,45 char *buf,46 u32 size)47{48 if (!pr_reg->isid_present_at_reg) {49 buf[0] = '\0';50 return;51 }52 53 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);54}55 56enum register_type {57 REGISTER,58 REGISTER_AND_IGNORE_EXISTING_KEY,59 REGISTER_AND_MOVE,60};61 62enum preempt_type {63 PREEMPT,64 PREEMPT_AND_ABORT,65};66 67static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,68 struct t10_pr_registration *, int, int);69 70static int is_reservation_holder(71 struct t10_pr_registration *pr_res_holder,72 struct t10_pr_registration *pr_reg)73{74 int pr_res_type;75 76 if (pr_res_holder) {77 pr_res_type = pr_res_holder->pr_res_type;78 79 return pr_res_holder == pr_reg ||80 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||81 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;82 }83 return 0;84}85 86static sense_reason_t87target_scsi2_reservation_check(struct se_cmd *cmd)88{89 struct se_device *dev = cmd->se_dev;90 struct se_session *sess = cmd->se_sess;91 92 switch (cmd->t_task_cdb[0]) {93 case INQUIRY:94 case RELEASE:95 case RELEASE_10:96 return 0;97 default:98 break;99 }100 101 if (!dev->reservation_holder || !sess)102 return 0;103 104 if (dev->reservation_holder->se_node_acl != sess->se_node_acl)105 return TCM_RESERVATION_CONFLICT;106 107 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {108 if (dev->dev_res_bin_isid != sess->sess_bin_isid)109 return TCM_RESERVATION_CONFLICT;110 }111 112 return 0;113}114 115static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,116 struct se_node_acl *, struct se_session *);117static void core_scsi3_put_pr_reg(struct t10_pr_registration *);118 119static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)120{121 struct se_session *se_sess = cmd->se_sess;122 struct se_device *dev = cmd->se_dev;123 struct t10_pr_registration *pr_reg;124 struct t10_reservation *pr_tmpl = &dev->t10_pr;125 int conflict = 0;126 127 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,128 se_sess);129 if (pr_reg) {130 /*131 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE132 * behavior133 *134 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD135 * status, but no reservation shall be established and the136 * persistent reservation shall not be changed, if the command137 * is received from a) and b) below.138 *139 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD140 * status, but the persistent reservation shall not be released,141 * if the command is received from a) and b)142 *143 * a) An I_T nexus that is a persistent reservation holder; or144 * b) An I_T nexus that is registered if a registrants only or145 * all registrants type persistent reservation is present.146 *147 * In all other cases, a RESERVE(6) command, RESERVE(10) command,148 * RELEASE(6) command, or RELEASE(10) command shall be processed149 * as defined in SPC-2.150 */151 if (pr_reg->pr_res_holder) {152 core_scsi3_put_pr_reg(pr_reg);153 return 1;154 }155 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||156 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||157 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||158 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {159 core_scsi3_put_pr_reg(pr_reg);160 return 1;161 }162 core_scsi3_put_pr_reg(pr_reg);163 conflict = 1;164 } else {165 /*166 * Following spc2r20 5.5.1 Reservations overview:167 *168 * If a logical unit has executed a PERSISTENT RESERVE OUT169 * command with the REGISTER or the REGISTER AND IGNORE170 * EXISTING KEY service action and is still registered by any171 * initiator, all RESERVE commands and all RELEASE commands172 * regardless of initiator shall conflict and shall terminate173 * with a RESERVATION CONFLICT status.174 */175 spin_lock(&pr_tmpl->registration_lock);176 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;177 spin_unlock(&pr_tmpl->registration_lock);178 }179 180 if (conflict) {181 pr_err("Received legacy SPC-2 RESERVE/RELEASE"182 " while active SPC-3 registrations exist,"183 " returning RESERVATION_CONFLICT\n");184 return -EBUSY;185 }186 187 return 0;188}189 190void target_release_reservation(struct se_device *dev)191{192 dev->reservation_holder = NULL;193 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;194 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {195 dev->dev_res_bin_isid = 0;196 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;197 }198}199 200sense_reason_t201target_scsi2_reservation_release(struct se_cmd *cmd)202{203 struct se_device *dev = cmd->se_dev;204 struct se_session *sess = cmd->se_sess;205 struct se_portal_group *tpg;206 int rc;207 208 if (!sess || !sess->se_tpg)209 goto out;210 rc = target_check_scsi2_reservation_conflict(cmd);211 if (rc == 1)212 goto out;213 if (rc < 0)214 return TCM_RESERVATION_CONFLICT;215 216 spin_lock(&dev->dev_reservation_lock);217 if (!dev->reservation_holder || !sess)218 goto out_unlock;219 220 if (dev->reservation_holder->se_node_acl != sess->se_node_acl)221 goto out_unlock;222 223 if (dev->dev_res_bin_isid != sess->sess_bin_isid)224 goto out_unlock;225 226 target_release_reservation(dev);227 tpg = sess->se_tpg;228 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"229 " MAPPED LUN: %llu for %s\n",230 tpg->se_tpg_tfo->fabric_name,231 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,232 sess->se_node_acl->initiatorname);233 234out_unlock:235 spin_unlock(&dev->dev_reservation_lock);236out:237 target_complete_cmd(cmd, SAM_STAT_GOOD);238 return 0;239}240 241sense_reason_t242target_scsi2_reservation_reserve(struct se_cmd *cmd)243{244 struct se_device *dev = cmd->se_dev;245 struct se_session *sess = cmd->se_sess;246 struct se_portal_group *tpg;247 sense_reason_t ret = 0;248 int rc;249 250 if ((cmd->t_task_cdb[1] & 0x01) &&251 (cmd->t_task_cdb[1] & 0x02)) {252 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");253 return TCM_UNSUPPORTED_SCSI_OPCODE;254 }255 /*256 * This is currently the case for target_core_mod passthrough struct se_cmd257 * ops258 */259 if (!sess || !sess->se_tpg)260 goto out;261 rc = target_check_scsi2_reservation_conflict(cmd);262 if (rc == 1)263 goto out;264 265 if (rc < 0)266 return TCM_RESERVATION_CONFLICT;267 268 tpg = sess->se_tpg;269 spin_lock(&dev->dev_reservation_lock);270 if (dev->reservation_holder &&271 dev->reservation_holder->se_node_acl != sess->se_node_acl) {272 pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n",273 tpg->se_tpg_tfo->fabric_name);274 pr_err("Original reserver LUN: %llu %s\n",275 cmd->se_lun->unpacked_lun,276 dev->reservation_holder->se_node_acl->initiatorname);277 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"278 " from %s \n", cmd->se_lun->unpacked_lun,279 cmd->orig_fe_lun,280 sess->se_node_acl->initiatorname);281 ret = TCM_RESERVATION_CONFLICT;282 goto out_unlock;283 }284 285 dev->reservation_holder = sess;286 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;287 if (sess->sess_bin_isid != 0) {288 dev->dev_res_bin_isid = sess->sess_bin_isid;289 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;290 }291 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"292 " for %s\n", tpg->se_tpg_tfo->fabric_name,293 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,294 sess->se_node_acl->initiatorname);295 296out_unlock:297 spin_unlock(&dev->dev_reservation_lock);298out:299 if (!ret)300 target_complete_cmd(cmd, SAM_STAT_GOOD);301 return ret;302}303 304 305/*306 * Begin SPC-3/SPC-4 Persistent Reservations emulation support307 *308 * This function is called by those initiator ports who are *NOT*309 * the active PR reservation holder when a reservation is present.310 */311static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,312 bool isid_mismatch)313{314 unsigned char *cdb = cmd->t_task_cdb;315 struct se_session *se_sess = cmd->se_sess;316 struct se_node_acl *nacl = se_sess->se_node_acl;317 int other_cdb = 0;318 int registered_nexus = 0, ret = 1; /* Conflict by default */319 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */320 int we = 0; /* Write Exclusive */321 int legacy = 0; /* Act like a legacy device and return322 * RESERVATION CONFLICT on some CDBs */323 324 if (isid_mismatch) {325 registered_nexus = 0;326 } else {327 struct se_dev_entry *se_deve;328 329 rcu_read_lock();330 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);331 if (se_deve)332 registered_nexus = test_bit(DEF_PR_REG_ACTIVE,333 &se_deve->deve_flags);334 rcu_read_unlock();335 }336 337 switch (pr_reg_type) {338 case PR_TYPE_WRITE_EXCLUSIVE:339 we = 1;340 fallthrough;341 case PR_TYPE_EXCLUSIVE_ACCESS:342 /*343 * Some commands are only allowed for the persistent reservation344 * holder.345 */346 break;347 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:348 we = 1;349 fallthrough;350 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:351 /*352 * Some commands are only allowed for registered I_T Nexuses.353 */354 reg_only = 1;355 break;356 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:357 we = 1;358 fallthrough;359 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:360 /*361 * Each registered I_T Nexus is a reservation holder.362 */363 all_reg = 1;364 break;365 default:366 return -EINVAL;367 }368 /*369 * Referenced from spc4r17 table 45 for *NON* PR holder access370 */371 switch (cdb[0]) {372 case SECURITY_PROTOCOL_IN:373 if (registered_nexus)374 return 0;375 ret = (we) ? 0 : 1;376 break;377 case MODE_SENSE:378 case MODE_SENSE_10:379 case READ_ATTRIBUTE:380 case READ_BUFFER:381 case RECEIVE_DIAGNOSTIC:382 if (legacy) {383 ret = 1;384 break;385 }386 if (registered_nexus) {387 ret = 0;388 break;389 }390 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */391 break;392 case PERSISTENT_RESERVE_OUT:393 /*394 * This follows PERSISTENT_RESERVE_OUT service actions that395 * are allowed in the presence of various reservations.396 * See spc4r17, table 46397 */398 switch (cdb[1] & 0x1f) {399 case PRO_CLEAR:400 case PRO_PREEMPT:401 case PRO_PREEMPT_AND_ABORT:402 ret = (registered_nexus) ? 0 : 1;403 break;404 case PRO_REGISTER:405 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:406 ret = 0;407 break;408 case PRO_REGISTER_AND_MOVE:409 case PRO_RESERVE:410 ret = 1;411 break;412 case PRO_RELEASE:413 ret = (registered_nexus) ? 0 : 1;414 break;415 default:416 pr_err("Unknown PERSISTENT_RESERVE_OUT service"417 " action: 0x%02x\n", cdb[1] & 0x1f);418 return -EINVAL;419 }420 break;421 case RELEASE:422 case RELEASE_10:423 /* Handled by CRH=1 in target_scsi2_reservation_release() */424 ret = 0;425 break;426 case RESERVE:427 case RESERVE_10:428 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */429 ret = 0;430 break;431 case TEST_UNIT_READY:432 ret = (legacy) ? 1 : 0; /* Conflict for legacy */433 break;434 case MAINTENANCE_IN:435 switch (cdb[1] & 0x1f) {436 case MI_MANAGEMENT_PROTOCOL_IN:437 if (registered_nexus) {438 ret = 0;439 break;440 }441 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */442 break;443 case MI_REPORT_SUPPORTED_OPERATION_CODES:444 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:445 if (legacy) {446 ret = 1;447 break;448 }449 if (registered_nexus) {450 ret = 0;451 break;452 }453 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */454 break;455 case MI_REPORT_ALIASES:456 case MI_REPORT_IDENTIFYING_INFORMATION:457 case MI_REPORT_PRIORITY:458 case MI_REPORT_TARGET_PGS:459 case MI_REPORT_TIMESTAMP:460 ret = 0; /* Allowed */461 break;462 default:463 pr_err("Unknown MI Service Action: 0x%02x\n",464 (cdb[1] & 0x1f));465 return -EINVAL;466 }467 break;468 case ACCESS_CONTROL_IN:469 case ACCESS_CONTROL_OUT:470 case INQUIRY:471 case LOG_SENSE:472 case SERVICE_ACTION_IN_12:473 case READ_CAPACITY:474 case REPORT_LUNS:475 case REQUEST_SENSE:476 case PERSISTENT_RESERVE_IN:477 ret = 0; /*/ Allowed CDBs */478 break;479 default:480 other_cdb = 1;481 break;482 }483 /*484 * Case where the CDB is explicitly allowed in the above switch485 * statement.486 */487 if (!ret && !other_cdb) {488 pr_debug("Allowing explicit CDB: 0x%02x for %s"489 " reservation holder\n", cdb[0],490 core_scsi3_pr_dump_type(pr_reg_type));491 492 return ret;493 }494 /*495 * Check if write exclusive initiator ports *NOT* holding the496 * WRITE_EXCLUSIVE_* reservation.497 */498 if (we && !registered_nexus) {499 if (cmd->data_direction == DMA_TO_DEVICE) {500 /*501 * Conflict for write exclusive502 */503 pr_debug("%s Conflict for unregistered nexus"504 " %s CDB: 0x%02x to %s reservation\n",505 transport_dump_cmd_direction(cmd),506 se_sess->se_node_acl->initiatorname, cdb[0],507 core_scsi3_pr_dump_type(pr_reg_type));508 return 1;509 } else {510 /*511 * Allow non WRITE CDBs for all Write Exclusive512 * PR TYPEs to pass for registered and513 * non-registered_nexuxes NOT holding the reservation.514 *515 * We only make noise for the unregisterd nexuses,516 * as we expect registered non-reservation holding517 * nexuses to issue CDBs.518 */519 520 if (!registered_nexus) {521 pr_debug("Allowing implicit CDB: 0x%02x"522 " for %s reservation on unregistered"523 " nexus\n", cdb[0],524 core_scsi3_pr_dump_type(pr_reg_type));525 }526 527 return 0;528 }529 } else if ((reg_only) || (all_reg)) {530 if (registered_nexus) {531 /*532 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,533 * allow commands from registered nexuses.534 */535 536 pr_debug("Allowing implicit CDB: 0x%02x for %s"537 " reservation\n", cdb[0],538 core_scsi3_pr_dump_type(pr_reg_type));539 540 return 0;541 }542 } else if (we && registered_nexus) {543 /*544 * Reads are allowed for Write Exclusive locks545 * from all registrants.546 */547 if (cmd->data_direction == DMA_FROM_DEVICE) {548 pr_debug("Allowing READ CDB: 0x%02x for %s"549 " reservation\n", cdb[0],550 core_scsi3_pr_dump_type(pr_reg_type));551 552 return 0;553 }554 }555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"556 " for %s reservation\n", transport_dump_cmd_direction(cmd),557 (registered_nexus) ? "" : "un",558 se_sess->se_node_acl->initiatorname, cdb[0],559 core_scsi3_pr_dump_type(pr_reg_type));560 561 return 1; /* Conflict by default */562}563 564static sense_reason_t565target_scsi3_pr_reservation_check(struct se_cmd *cmd)566{567 struct se_device *dev = cmd->se_dev;568 struct se_session *sess = cmd->se_sess;569 u32 pr_reg_type;570 bool isid_mismatch = false;571 572 if (!dev->dev_pr_res_holder)573 return 0;574 575 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;576 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;577 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)578 goto check_nonholder;579 580 if (dev->dev_pr_res_holder->isid_present_at_reg) {581 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=582 sess->sess_bin_isid) {583 isid_mismatch = true;584 goto check_nonholder;585 }586 }587 588 return 0;589 590check_nonholder:591 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))592 return TCM_RESERVATION_CONFLICT;593 return 0;594}595 596static u32 core_scsi3_pr_generation(struct se_device *dev)597{598 u32 prg;599 600 /*601 * PRGeneration field shall contain the value of a 32-bit wrapping602 * counter mainted by the device server.603 *604 * Note that this is done regardless of Active Persist across605 * Target PowerLoss (APTPL)606 *607 * See spc4r17 section 6.3.12 READ_KEYS service action608 */609 spin_lock(&dev->dev_reservation_lock);610 prg = dev->t10_pr.pr_generation++;611 spin_unlock(&dev->dev_reservation_lock);612 613 return prg;614}615 616static struct t10_pr_registration *__core_scsi3_do_alloc_registration(617 struct se_device *dev,618 struct se_node_acl *nacl,619 struct se_lun *lun,620 struct se_dev_entry *dest_deve,621 u64 mapped_lun,622 unsigned char *isid,623 u64 sa_res_key,624 int all_tg_pt,625 int aptpl)626{627 struct t10_pr_registration *pr_reg;628 629 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);630 if (!pr_reg) {631 pr_err("Unable to allocate struct t10_pr_registration\n");632 return NULL;633 }634 635 INIT_LIST_HEAD(&pr_reg->pr_reg_list);636 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);637 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);638 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);640 atomic_set(&pr_reg->pr_res_holders, 0);641 pr_reg->pr_reg_nacl = nacl;642 /*643 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,644 * the se_dev_entry->pr_ref will have been already obtained by645 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().646 *647 * Otherwise, locate se_dev_entry now and obtain a reference until648 * registration completes in __core_scsi3_add_registration().649 */650 if (dest_deve) {651 pr_reg->pr_reg_deve = dest_deve;652 } else {653 rcu_read_lock();654 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);655 if (!pr_reg->pr_reg_deve) {656 rcu_read_unlock();657 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",658 nacl->initiatorname, mapped_lun);659 kmem_cache_free(t10_pr_reg_cache, pr_reg);660 return NULL;661 }662 kref_get(&pr_reg->pr_reg_deve->pr_kref);663 rcu_read_unlock();664 }665 pr_reg->pr_res_mapped_lun = mapped_lun;666 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;667 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;668 pr_reg->pr_res_key = sa_res_key;669 pr_reg->pr_reg_all_tg_pt = all_tg_pt;670 pr_reg->pr_reg_aptpl = aptpl;671 /*672 * If an ISID value for this SCSI Initiator Port exists,673 * save it to the registration now.674 */675 if (isid != NULL) {676 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);677 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);678 pr_reg->isid_present_at_reg = 1;679 }680 681 return pr_reg;682}683 684static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);685static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);686 687/*688 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0689 * modes.690 */691static struct t10_pr_registration *__core_scsi3_alloc_registration(692 struct se_device *dev,693 struct se_node_acl *nacl,694 struct se_lun *lun,695 struct se_dev_entry *deve,696 u64 mapped_lun,697 unsigned char *isid,698 u64 sa_res_key,699 int all_tg_pt,700 int aptpl)701{702 struct se_dev_entry *deve_tmp;703 struct se_node_acl *nacl_tmp;704 struct se_lun_acl *lacl_tmp;705 struct se_lun *lun_tmp, *next, *dest_lun;706 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;707 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;708 int ret;709 /*710 * Create a registration for the I_T Nexus upon which the711 * PROUT REGISTER was received.712 */713 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,714 isid, sa_res_key, all_tg_pt,715 aptpl);716 if (!pr_reg)717 return NULL;718 /*719 * Return pointer to pr_reg for ALL_TG_PT=0720 */721 if (!all_tg_pt)722 return pr_reg;723 /*724 * Create list of matching SCSI Initiator Port registrations725 * for ALL_TG_PT=1726 */727 spin_lock(&dev->se_port_lock);728 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {729 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))730 continue;731 spin_unlock(&dev->se_port_lock);732 733 spin_lock(&lun_tmp->lun_deve_lock);734 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {735 /*736 * This pointer will be NULL for demo mode MappedLUNs737 * that have not been make explicit via a ConfigFS738 * MappedLUN group for the SCSI Initiator Node ACL.739 */740 if (!deve_tmp->se_lun_acl)741 continue;742 743 lacl_tmp = deve_tmp->se_lun_acl;744 nacl_tmp = lacl_tmp->se_lun_nacl;745 /*746 * Skip the matching struct se_node_acl that is allocated747 * above..748 */749 if (nacl == nacl_tmp)750 continue;751 /*752 * Only perform PR registrations for target ports on753 * the same fabric module as the REGISTER w/ ALL_TG_PT=1754 * arrived.755 */756 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)757 continue;758 /*759 * Look for a matching Initiator Node ACL in ASCII format760 */761 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))762 continue;763 764 kref_get(&deve_tmp->pr_kref);765 spin_unlock(&lun_tmp->lun_deve_lock);766 /*767 * Grab a configfs group dependency that is released768 * for the exception path at label out: below, or upon769 * completion of adding ALL_TG_PT=1 registrations in770 * __core_scsi3_add_registration()771 */772 ret = core_scsi3_lunacl_depend_item(deve_tmp);773 if (ret < 0) {774 pr_err("core_scsi3_lunacl_depend"775 "_item() failed\n");776 percpu_ref_put(&lun_tmp->lun_ref);777 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);778 goto out;779 }780 /*781 * Located a matching SCSI Initiator Port on a different782 * port, allocate the pr_reg_atp and attach it to the783 * pr_reg->pr_reg_atp_list that will be processed once784 * the original *pr_reg is processed in785 * __core_scsi3_add_registration()786 */787 dest_lun = deve_tmp->se_lun;788 789 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,790 nacl_tmp, dest_lun, deve_tmp,791 deve_tmp->mapped_lun, NULL,792 sa_res_key, all_tg_pt, aptpl);793 if (!pr_reg_atp) {794 percpu_ref_put(&lun_tmp->lun_ref);795 core_scsi3_lunacl_undepend_item(deve_tmp);796 goto out;797 }798 799 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,800 &pr_reg->pr_reg_atp_list);801 spin_lock(&lun_tmp->lun_deve_lock);802 }803 spin_unlock(&lun_tmp->lun_deve_lock);804 805 spin_lock(&dev->se_port_lock);806 percpu_ref_put(&lun_tmp->lun_ref);807 }808 spin_unlock(&dev->se_port_lock);809 810 return pr_reg;811out:812 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,813 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {814 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);815 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);816 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);817 }818 kmem_cache_free(t10_pr_reg_cache, pr_reg);819 return NULL;820}821 822int core_scsi3_alloc_aptpl_registration(823 struct t10_reservation *pr_tmpl,824 u64 sa_res_key,825 unsigned char *i_port,826 unsigned char *isid,827 u64 mapped_lun,828 unsigned char *t_port,829 u16 tpgt,830 u64 target_lun,831 int res_holder,832 int all_tg_pt,833 u8 type)834{835 struct t10_pr_registration *pr_reg;836 837 if (!i_port || !t_port || !sa_res_key) {838 pr_err("Illegal parameters for APTPL registration\n");839 return -EINVAL;840 }841 842 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);843 if (!pr_reg) {844 pr_err("Unable to allocate struct t10_pr_registration\n");845 return -ENOMEM;846 }847 848 INIT_LIST_HEAD(&pr_reg->pr_reg_list);849 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);850 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);851 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);852 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);853 atomic_set(&pr_reg->pr_res_holders, 0);854 pr_reg->pr_reg_nacl = NULL;855 pr_reg->pr_reg_deve = NULL;856 pr_reg->pr_res_mapped_lun = mapped_lun;857 pr_reg->pr_aptpl_target_lun = target_lun;858 pr_reg->pr_res_key = sa_res_key;859 pr_reg->pr_reg_all_tg_pt = all_tg_pt;860 pr_reg->pr_reg_aptpl = 1;861 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */862 pr_reg->pr_res_type = type;863 /*864 * If an ISID value had been saved in APTPL metadata for this865 * SCSI Initiator Port, restore it now.866 */867 if (isid != NULL) {868 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);869 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);870 pr_reg->isid_present_at_reg = 1;871 }872 /*873 * Copy the i_port and t_port information from caller.874 */875 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);876 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);877 pr_reg->pr_reg_tpgt = tpgt;878 /*879 * Set pr_res_holder from caller, the pr_reg who is the reservation880 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once881 * the Initiator Node LUN ACL from the fabric module is created for882 * this registration.883 */884 pr_reg->pr_res_holder = res_holder;885 886 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);887 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"888 " metadata\n", (res_holder) ? "+reservation" : "");889 return 0;890}891 892static void core_scsi3_aptpl_reserve(893 struct se_device *dev,894 struct se_portal_group *tpg,895 struct se_node_acl *node_acl,896 struct t10_pr_registration *pr_reg)897{898 char i_buf[PR_REG_ISID_ID_LEN] = { };899 900 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);901 902 spin_lock(&dev->dev_reservation_lock);903 dev->dev_pr_res_holder = pr_reg;904 spin_unlock(&dev->dev_reservation_lock);905 906 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"907 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",908 tpg->se_tpg_tfo->fabric_name,909 core_scsi3_pr_dump_type(pr_reg->pr_res_type),910 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);911 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",912 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname,913 i_buf);914}915 916static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,917 struct t10_pr_registration *, enum register_type, int);918 919static int __core_scsi3_check_aptpl_registration(920 struct se_device *dev,921 struct se_portal_group *tpg,922 struct se_lun *lun,923 u64 target_lun,924 struct se_node_acl *nacl,925 u64 mapped_lun)926{927 struct t10_pr_registration *pr_reg, *pr_reg_tmp;928 struct t10_reservation *pr_tmpl = &dev->t10_pr;929 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };930 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };931 u16 tpgt;932 933 /*934 * Copy Initiator Port information from struct se_node_acl935 */936 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);937 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",938 tpg->se_tpg_tfo->tpg_get_wwn(tpg));939 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);940 /*941 * Look for the matching registrations+reservation from those942 * created from APTPL metadata. Note that multiple registrations943 * may exist for fabrics that use ISIDs in their SCSI Initiator Port944 * TransportIDs.945 */946 spin_lock(&pr_tmpl->aptpl_reg_lock);947 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,948 pr_reg_aptpl_list) {949 950 if (!strcmp(pr_reg->pr_iport, i_port) &&951 (pr_reg->pr_res_mapped_lun == mapped_lun) &&952 !(strcmp(pr_reg->pr_tport, t_port)) &&953 (pr_reg->pr_reg_tpgt == tpgt) &&954 (pr_reg->pr_aptpl_target_lun == target_lun)) {955 /*956 * Obtain the ->pr_reg_deve pointer + reference, that957 * is released by __core_scsi3_add_registration() below.958 */959 rcu_read_lock();960 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);961 if (!pr_reg->pr_reg_deve) {962 pr_err("Unable to locate PR APTPL %s mapped_lun:"963 " %llu\n", nacl->initiatorname, mapped_lun);964 rcu_read_unlock();965 continue;966 }967 kref_get(&pr_reg->pr_reg_deve->pr_kref);968 rcu_read_unlock();969 970 pr_reg->pr_reg_nacl = nacl;971 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;972 list_del(&pr_reg->pr_reg_aptpl_list);973 spin_unlock(&pr_tmpl->aptpl_reg_lock);974 /*975 * At this point all of the pointers in *pr_reg will976 * be setup, so go ahead and add the registration.977 */978 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);979 /*980 * If this registration is the reservation holder,981 * make that happen now..982 */983 if (pr_reg->pr_res_holder)984 core_scsi3_aptpl_reserve(dev, tpg,985 nacl, pr_reg);986 /*987 * Reenable pr_aptpl_active to accept new metadata988 * updates once the SCSI device is active again..989 */990 spin_lock(&pr_tmpl->aptpl_reg_lock);991 pr_tmpl->pr_aptpl_active = 1;992 }993 }994 spin_unlock(&pr_tmpl->aptpl_reg_lock);995 996 return 0;997}998 999int core_scsi3_check_aptpl_registration(1000 struct se_device *dev,1001 struct se_portal_group *tpg,1002 struct se_lun *lun,1003 struct se_node_acl *nacl,1004 u64 mapped_lun)1005{1006 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)1007 return 0;1008 1009 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,1010 lun->unpacked_lun, nacl,1011 mapped_lun);1012}1013 1014static void __core_scsi3_dump_registration(1015 const struct target_core_fabric_ops *tfo,1016 struct se_device *dev,1017 struct se_node_acl *nacl,1018 struct t10_pr_registration *pr_reg,1019 enum register_type register_type)1020{1021 struct se_portal_group *se_tpg = nacl->se_tpg;1022 char i_buf[PR_REG_ISID_ID_LEN] = { };1023 1024 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);1025 1026 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"1027 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?1028 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?1029 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,1030 i_buf);1031 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",1032 tfo->fabric_name, tfo->tpg_get_wwn(se_tpg),1033 tfo->tpg_get_tag(se_tpg));1034 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"1035 " Port(s)\n", tfo->fabric_name,1036 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",1037 dev->transport->name);1038 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"1039 " 0x%08x APTPL: %d\n", tfo->fabric_name,1040 pr_reg->pr_res_key, pr_reg->pr_res_generation,1041 pr_reg->pr_reg_aptpl);1042}1043 1044static void __core_scsi3_add_registration(1045 struct se_device *dev,1046 struct se_node_acl *nacl,1047 struct t10_pr_registration *pr_reg,1048 enum register_type register_type,1049 int register_move)1050{1051 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;1052 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;1053 struct t10_reservation *pr_tmpl = &dev->t10_pr;1054 struct se_dev_entry *deve;1055 1056 /*1057 * Increment PRgeneration counter for struct se_device upon a successful1058 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action1059 *1060 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service1061 * action, the struct se_device->dev_reservation_lock will already be held,1062 * so we do not call core_scsi3_pr_generation() which grabs the lock1063 * for the REGISTER.1064 */1065 pr_reg->pr_res_generation = (register_move) ?1066 dev->t10_pr.pr_generation++ :1067 core_scsi3_pr_generation(dev);1068 1069 spin_lock(&pr_tmpl->registration_lock);1070 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);1071 1072 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);1073 spin_unlock(&pr_tmpl->registration_lock);1074 /*1075 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.1076 */1077 if (!pr_reg->pr_reg_all_tg_pt || register_move)1078 goto out;1079 /*1080 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=11081 * allocated in __core_scsi3_alloc_registration()1082 */1083 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,1084 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {1085 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;1086 1087 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);1088 1089 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);1090 1091 spin_lock(&pr_tmpl->registration_lock);1092 list_add_tail(&pr_reg_tmp->pr_reg_list,1093 &pr_tmpl->registration_list);1094 1095 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,1096 register_type);1097 spin_unlock(&pr_tmpl->registration_lock);1098 /*1099 * Drop configfs group dependency reference and deve->pr_kref1100 * obtained from __core_scsi3_alloc_registration() code.1101 */1102 rcu_read_lock();1103 deve = pr_reg_tmp->pr_reg_deve;1104 if (deve) {1105 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);1106 core_scsi3_lunacl_undepend_item(deve);1107 pr_reg_tmp->pr_reg_deve = NULL;1108 }1109 rcu_read_unlock();1110 }1111out:1112 /*1113 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()1114 */1115 rcu_read_lock();1116 deve = pr_reg->pr_reg_deve;1117 if (deve) {1118 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);1119 kref_put(&deve->pr_kref, target_pr_kref_release);1120 pr_reg->pr_reg_deve = NULL;1121 }1122 rcu_read_unlock();1123}1124 1125static int core_scsi3_alloc_registration(1126 struct se_device *dev,1127 struct se_node_acl *nacl,1128 struct se_lun *lun,1129 struct se_dev_entry *deve,1130 u64 mapped_lun,1131 unsigned char *isid,1132 u64 sa_res_key,1133 int all_tg_pt,1134 int aptpl,1135 enum register_type register_type,1136 int register_move)1137{1138 struct t10_pr_registration *pr_reg;1139 1140 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,1141 isid, sa_res_key, all_tg_pt,1142 aptpl);1143 if (!pr_reg)1144 return -EPERM;1145 1146 __core_scsi3_add_registration(dev, nacl, pr_reg,1147 register_type, register_move);1148 return 0;1149}1150 1151static struct t10_pr_registration *__core_scsi3_locate_pr_reg(1152 struct se_device *dev,1153 struct se_node_acl *nacl,1154 unsigned char *isid)1155{1156 struct t10_reservation *pr_tmpl = &dev->t10_pr;1157 struct t10_pr_registration *pr_reg, *pr_reg_tmp;1158 1159 spin_lock(&pr_tmpl->registration_lock);1160 list_for_each_entry_safe(pr_reg, pr_reg_tmp,1161 &pr_tmpl->registration_list, pr_reg_list) {1162 /*1163 * First look for a matching struct se_node_acl1164 */1165 if (pr_reg->pr_reg_nacl != nacl)1166 continue;1167 1168 /*1169 * If this registration does NOT contain a fabric provided1170 * ISID, then we have found a match.1171 */1172 if (!pr_reg->isid_present_at_reg) {1173 atomic_inc_mb(&pr_reg->pr_res_holders);1174 spin_unlock(&pr_tmpl->registration_lock);1175 return pr_reg;1176 }1177 /*1178 * If the *pr_reg contains a fabric defined ISID for multi-value1179 * SCSI Initiator Port TransportIDs, then we expect a valid1180 * matching ISID to be provided by the local SCSI Initiator Port.1181 */1182 if (!isid)1183 continue;1184 if (strcmp(isid, pr_reg->pr_reg_isid))1185 continue;1186 1187 atomic_inc_mb(&pr_reg->pr_res_holders);1188 spin_unlock(&pr_tmpl->registration_lock);1189 return pr_reg;1190 }1191 spin_unlock(&pr_tmpl->registration_lock);1192 1193 return NULL;1194}1195 1196static struct t10_pr_registration *core_scsi3_locate_pr_reg(1197 struct se_device *dev,1198 struct se_node_acl *nacl,1199 struct se_session *sess)1200{1201 struct se_portal_group *tpg = nacl->se_tpg;1202 unsigned char buf[PR_REG_ISID_LEN] = { };1203 unsigned char *isid_ptr = NULL;1204 1205 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {1206 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],1207 PR_REG_ISID_LEN);1208 isid_ptr = &buf[0];1209 }1210 1211 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);1212}1213 1214static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)1215{1216 atomic_dec_mb(&pr_reg->pr_res_holders);1217}1218 1219static int core_scsi3_check_implicit_release(1220 struct se_device *dev,1221 struct t10_pr_registration *pr_reg)1222{1223 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;1224 struct t10_pr_registration *pr_res_holder;1225 int ret = 0;1226 1227 spin_lock(&dev->dev_reservation_lock);1228 pr_res_holder = dev->dev_pr_res_holder;1229 if (!pr_res_holder) {1230 spin_unlock(&dev->dev_reservation_lock);1231 return ret;1232 }1233 if (pr_res_holder == pr_reg) {1234 /*1235 * Perform an implicit RELEASE if the registration that1236 * is being released is holding the reservation.1237 *1238 * From spc4r17, section 5.7.11.1:1239 *1240 * e) If the I_T nexus is the persistent reservation holder1241 * and the persistent reservation is not an all registrants1242 * type, then a PERSISTENT RESERVE OUT command with REGISTER1243 * service action or REGISTER AND IGNORE EXISTING KEY1244 * service action with the SERVICE ACTION RESERVATION KEY1245 * field set to zero (see 5.7.11.3).1246 */1247 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);1248 ret = 1;1249 /*1250 * For 'All Registrants' reservation types, all existing1251 * registrations are still processed as reservation holders1252 * in core_scsi3_pr_seq_non_holder() after the initial1253 * reservation holder is implicitly released here.1254 */1255 } else if (pr_reg->pr_reg_all_tg_pt &&1256 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,1257 pr_reg->pr_reg_nacl->initiatorname)) &&1258 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {1259 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"1260 " UNREGISTER while existing reservation with matching"1261 " key 0x%016Lx is present from another SCSI Initiator"1262 " Port\n", pr_reg->pr_res_key);1263 ret = -EPERM;1264 }1265 spin_unlock(&dev->dev_reservation_lock);1266 1267 return ret;1268}1269 1270static void __core_scsi3_free_registration(1271 struct se_device *dev,1272 struct t10_pr_registration *pr_reg,1273 struct list_head *preempt_and_abort_list,1274 int dec_holders)1275 __releases(&pr_tmpl->registration_lock)1276 __acquires(&pr_tmpl->registration_lock)1277{1278 const struct target_core_fabric_ops *tfo =1279 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;1280 struct t10_reservation *pr_tmpl = &dev->t10_pr;1281 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;1282 struct se_dev_entry *deve;1283 char i_buf[PR_REG_ISID_ID_LEN] = { };1284 1285 lockdep_assert_held(&pr_tmpl->registration_lock);1286 1287 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);1288 1289 if (!list_empty(&pr_reg->pr_reg_list))1290 list_del(&pr_reg->pr_reg_list);1291 /*1292 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),1293 * so call core_scsi3_put_pr_reg() to decrement our reference.1294 */1295 if (dec_holders)1296 core_scsi3_put_pr_reg(pr_reg);1297 1298 spin_unlock(&pr_tmpl->registration_lock);1299 /*1300 * Wait until all reference from any other I_T nexuses for this1301 * *pr_reg have been released. Because list_del() is called above,1302 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference1303 * count back to zero, and we release *pr_reg.1304 */1305 while (atomic_read(&pr_reg->pr_res_holders) != 0) {1306 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",1307 tfo->fabric_name);1308 cpu_relax();1309 }1310 1311 rcu_read_lock();1312 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);1313 if (deve)1314 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);1315 rcu_read_unlock();1316 1317 spin_lock(&pr_tmpl->registration_lock);1318 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"1319 " Node: %s%s\n", tfo->fabric_name,1320 pr_reg->pr_reg_nacl->initiatorname,1321 i_buf);1322 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"1323 " Port(s)\n", tfo->fabric_name,1324 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",1325 dev->transport->name);1326 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"1327 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key,1328 pr_reg->pr_res_generation);1329 1330 if (!preempt_and_abort_list) {1331 pr_reg->pr_reg_deve = NULL;1332 pr_reg->pr_reg_nacl = NULL;1333 kmem_cache_free(t10_pr_reg_cache, pr_reg);1334 return;1335 }1336 /*1337 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list1338 * are released once the ABORT_TASK_SET has completed..1339 */1340 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);1341}1342 1343void core_scsi3_free_pr_reg_from_nacl(1344 struct se_device *dev,1345 struct se_node_acl *nacl)1346{1347 struct t10_reservation *pr_tmpl = &dev->t10_pr;1348 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;1349 bool free_reg = false;1350 /*1351 * If the passed se_node_acl matches the reservation holder,1352 * release the reservation.1353 */1354 spin_lock(&dev->dev_reservation_lock);1355 pr_res_holder = dev->dev_pr_res_holder;1356 if ((pr_res_holder != NULL) &&1357 (pr_res_holder->pr_reg_nacl == nacl)) {1358 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);1359 free_reg = true;1360 }1361 spin_unlock(&dev->dev_reservation_lock);1362 /*1363 * Release any registration associated with the struct se_node_acl.1364 */1365 spin_lock(&pr_tmpl->registration_lock);1366 if (pr_res_holder && free_reg)1367 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);1368 1369 list_for_each_entry_safe(pr_reg, pr_reg_tmp,1370 &pr_tmpl->registration_list, pr_reg_list) {1371 1372 if (pr_reg->pr_reg_nacl != nacl)1373 continue;1374 1375 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);1376 }1377 spin_unlock(&pr_tmpl->registration_lock);1378}1379 1380void core_scsi3_free_all_registrations(1381 struct se_device *dev)1382{1383 struct t10_reservation *pr_tmpl = &dev->t10_pr;1384 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;1385 1386 spin_lock(&dev->dev_reservation_lock);1387 pr_res_holder = dev->dev_pr_res_holder;1388 if (pr_res_holder != NULL) {1389 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;1390 __core_scsi3_complete_pro_release(dev, pr_res_nacl,1391 pr_res_holder, 0, 0);1392 }1393 spin_unlock(&dev->dev_reservation_lock);1394 1395 spin_lock(&pr_tmpl->registration_lock);1396 list_for_each_entry_safe(pr_reg, pr_reg_tmp,1397 &pr_tmpl->registration_list, pr_reg_list) {1398 1399 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);1400 }1401 spin_unlock(&pr_tmpl->registration_lock);1402 1403 spin_lock(&pr_tmpl->aptpl_reg_lock);1404 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,1405 pr_reg_aptpl_list) {1406 list_del(&pr_reg->pr_reg_aptpl_list);1407 kmem_cache_free(t10_pr_reg_cache, pr_reg);1408 }1409 spin_unlock(&pr_tmpl->aptpl_reg_lock);1410}1411 1412static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)1413{1414 return target_depend_item(&tpg->tpg_group.cg_item);1415}1416 1417static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)1418{1419 target_undepend_item(&tpg->tpg_group.cg_item);1420 atomic_dec_mb(&tpg->tpg_pr_ref_count);1421}1422 1423static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)1424{1425 if (nacl->dynamic_node_acl)1426 return 0;1427 return target_depend_item(&nacl->acl_group.cg_item);1428}1429 1430static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)1431{1432 if (!nacl->dynamic_node_acl)1433 target_undepend_item(&nacl->acl_group.cg_item);1434 atomic_dec_mb(&nacl->acl_pr_ref_count);1435}1436 1437static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)1438{1439 /*1440 * For nacl->dynamic_node_acl=11441 */1442 if (!se_deve->se_lun_acl)1443 return 0;1444 1445 return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);1446}1447 1448static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)1449{1450 /*1451 * For nacl->dynamic_node_acl=11452 */1453 if (!se_deve->se_lun_acl) {1454 kref_put(&se_deve->pr_kref, target_pr_kref_release);1455 return;1456 }1457 1458 target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);1459 kref_put(&se_deve->pr_kref, target_pr_kref_release);1460}1461 1462static sense_reason_t1463core_scsi3_decode_spec_i_port(1464 struct se_cmd *cmd,1465 struct se_portal_group *tpg,1466 unsigned char *l_isid,1467 u64 sa_res_key,1468 int all_tg_pt,1469 int aptpl)1470{1471 struct se_device *dev = cmd->se_dev;1472 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;1473 struct se_session *se_sess = cmd->se_sess;1474 struct se_node_acl *dest_node_acl = NULL;1475 struct se_dev_entry *dest_se_deve = NULL;1476 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;1477 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;1478 LIST_HEAD(tid_dest_list);1479 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;1480 unsigned char *buf, *ptr, proto_ident;1481 const unsigned char *i_str = NULL;1482 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];1483 sense_reason_t ret;1484 u32 tpdl, tid_len = 0;1485 u32 dest_rtpi = 0;1486 1487 /*1488 * Allocate a struct pr_transport_id_holder and setup the1489 * local_node_acl pointer and add to struct list_head tid_dest_list1490 * for add registration processing in the loop of tid_dest_list below.1491 */1492 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);1493 if (!tidh_new) {1494 pr_err("Unable to allocate tidh_new\n");1495 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;1496 }1497 INIT_LIST_HEAD(&tidh_new->dest_list);1498 tidh_new->dest_tpg = tpg;1499 tidh_new->dest_node_acl = se_sess->se_node_acl;1500 1501 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,1502 se_sess->se_node_acl, cmd->se_lun,1503 NULL, cmd->orig_fe_lun, l_isid,1504 sa_res_key, all_tg_pt, aptpl);1505 if (!local_pr_reg) {1506 kfree(tidh_new);1507 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;1508 }1509 1510 if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {1511 kfree(tidh_new);1512 kref_put(&local_pr_reg->pr_reg_deve->pr_kref,1513 target_pr_kref_release);1514 kmem_cache_free(t10_pr_reg_cache, local_pr_reg);1515 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;1516 }1517 1518 tidh_new->dest_pr_reg = local_pr_reg;1519 list_add_tail(&tidh_new->dest_list, &tid_dest_list);1520 1521 if (cmd->data_length < 28) {1522 pr_warn("SPC-PR: Received PR OUT parameter list"1523 " length too small: %u\n", cmd->data_length);1524 ret = TCM_INVALID_PARAMETER_LIST;1525 goto out;1526 }1527 1528 buf = transport_kmap_data_sg(cmd);1529 if (!buf) {1530 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;1531 goto out;1532 }1533 1534 /*1535 * For a PERSISTENT RESERVE OUT specify initiator ports payload,1536 * first extract TransportID Parameter Data Length, and make sure1537 * the value matches up to the SCSI expected data transfer length.1538 */1539 tpdl = get_unaligned_be32(&buf[24]);1540 1541 if ((tpdl + 28) != cmd->data_length) {1542 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"1543 " does not equal CDB data_length: %u\n", tpdl,1544 cmd->data_length);1545 ret = TCM_INVALID_PARAMETER_LIST;1546 goto out_unmap;1547 }1548 /*1549 * Start processing the received transport IDs using the1550 * receiving I_T Nexus portal's fabric dependent methods to1551 * obtain the SCSI Initiator Port/Device Identifiers.1552 */1553 ptr = &buf[28];1554 1555 while (tpdl > 0) {1556 struct se_lun *dest_lun, *tmp_lun;1557 1558 proto_ident = (ptr[0] & 0x0f);1559 dest_tpg = NULL;1560 1561 spin_lock(&dev->se_port_lock);1562 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {1563 tmp_tpg = tmp_lun->lun_tpg;1564 1565 /*1566 * Look for the matching proto_ident provided by1567 * the received TransportID1568 */1569 if (tmp_tpg->proto_id != proto_ident)1570 continue;1571 dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi;1572 1573 iport_ptr = NULL;1574 i_str = target_parse_pr_out_transport_id(tmp_tpg,1575 ptr, &tid_len, &iport_ptr);1576 if (!i_str)1577 continue;1578 /*1579 * Determine if this SCSI device server requires that1580 * SCSI Intiatior TransportID w/ ISIDs is enforced1581 * for fabric modules (iSCSI) requiring them.1582 */1583 if (tpg->se_tpg_tfo->sess_get_initiator_sid &&1584 dev->dev_attrib.enforce_pr_isids &&1585 !iport_ptr) {1586 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",1587 i_str);1588 ret = TCM_INVALID_PARAMETER_LIST;1589 spin_unlock(&dev->se_port_lock);1590 goto out_unmap;1591 }1592 1593 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);1594 spin_unlock(&dev->se_port_lock);1595 1596 if (core_scsi3_tpg_depend_item(tmp_tpg)) {1597 pr_err(" core_scsi3_tpg_depend_item()"1598 " for tmp_tpg\n");1599 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);1600 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;1601 goto out_unmap;1602 }1603 /*1604 * Locate the destination initiator ACL to be registered1605 * from the decoded fabric module specific TransportID1606 * at *i_str.1607 */1608 mutex_lock(&tmp_tpg->acl_node_mutex);1609 dest_node_acl = __core_tpg_get_initiator_node_acl(1610 tmp_tpg, i_str);1611 if (dest_node_acl)1612 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);1613 mutex_unlock(&tmp_tpg->acl_node_mutex);1614 1615 if (!dest_node_acl) {1616 core_scsi3_tpg_undepend_item(tmp_tpg);1617 spin_lock(&dev->se_port_lock);1618 continue;1619 }1620 1621 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {1622 pr_err("configfs_depend_item() failed"1623 " for dest_node_acl->acl_group\n");1624 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);1625 core_scsi3_tpg_undepend_item(tmp_tpg);1626 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;1627 goto out_unmap;1628 }1629 1630 dest_tpg = tmp_tpg;1631 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",1632 dest_tpg->se_tpg_tfo->fabric_name,1633 dest_node_acl->initiatorname, dest_rtpi);1634 1635 spin_lock(&dev->se_port_lock);1636 break;1637 }1638 spin_unlock(&dev->se_port_lock);1639 1640 if (!dest_tpg) {1641 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"1642 " dest_tpg\n");1643 ret = TCM_INVALID_PARAMETER_LIST;1644 goto out_unmap;1645 }1646 1647 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"1648 " tid_len: %d for %s + %s\n",1649 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length,1650 tpdl, tid_len, i_str, iport_ptr);1651 1652 if (tid_len > tpdl) {1653 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"1654 " %u for Transport ID: %s\n", tid_len, ptr);1655 core_scsi3_nodeacl_undepend_item(dest_node_acl);1656 core_scsi3_tpg_undepend_item(dest_tpg);1657 ret = TCM_INVALID_PARAMETER_LIST;1658 goto out_unmap;1659 }1660 /*1661 * Locate the desintation struct se_dev_entry pointer for matching1662 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus1663 * Target Port.1664 */1665 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,1666 dest_rtpi);1667 if (!dest_se_deve) {1668 pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n",1669 dest_tpg->se_tpg_tfo->fabric_name,1670 dest_rtpi);1671 1672 core_scsi3_nodeacl_undepend_item(dest_node_acl);1673 core_scsi3_tpg_undepend_item(dest_tpg);1674 ret = TCM_INVALID_PARAMETER_LIST;1675 goto out_unmap;1676 }1677 1678 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {1679 pr_err("core_scsi3_lunacl_depend_item()"1680 " failed\n");1681 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);1682 core_scsi3_nodeacl_undepend_item(dest_node_acl);1683 core_scsi3_tpg_undepend_item(dest_tpg);1684 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;1685 goto out_unmap;1686 }1687 1688 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"1689 " dest_se_deve mapped_lun: %llu\n",1690 dest_tpg->se_tpg_tfo->fabric_name,1691 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);1692 1693 /*1694 * Skip any TransportIDs that already have a registration for1695 * this target port.1696 */1697 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,1698 iport_ptr);1699 if (pr_reg_e) {1700 core_scsi3_put_pr_reg(pr_reg_e);1701 core_scsi3_lunacl_undepend_item(dest_se_deve);1702 core_scsi3_nodeacl_undepend_item(dest_node_acl);1703 core_scsi3_tpg_undepend_item(dest_tpg);1704 ptr += tid_len;1705 tpdl -= tid_len;1706 tid_len = 0;1707 continue;1708 }1709 /*1710 * Allocate a struct pr_transport_id_holder and setup1711 * the dest_node_acl and dest_se_deve pointers for the1712 * loop below.1713 */1714 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),1715 GFP_KERNEL);1716 if (!tidh_new) {1717 pr_err("Unable to allocate tidh_new\n");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 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;1722 goto out_unmap;1723 }1724 INIT_LIST_HEAD(&tidh_new->dest_list);1725 tidh_new->dest_tpg = dest_tpg;1726 tidh_new->dest_node_acl = dest_node_acl;1727 tidh_new->dest_se_deve = dest_se_deve;1728 1729 /*1730 * Allocate, but do NOT add the registration for the1731 * TransportID referenced SCSI Initiator port. This1732 * done because of the following from spc4r17 in section1733 * 6.14.3 wrt SPEC_I_PT:1734 *1735 * "If a registration fails for any initiator port (e.g., if th1736 * logical unit does not have enough resources available to1737 * hold the registration information), no registrations shall be1738 * made, and the command shall be terminated with1739 * CHECK CONDITION status."1740 *1741 * That means we call __core_scsi3_alloc_registration() here,1742 * and then call __core_scsi3_add_registration() in the1743 * 2nd loop which will never fail.1744 */1745 dest_lun = dest_se_deve->se_lun;1746 1747 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,1748 dest_node_acl, dest_lun, dest_se_deve,1749 dest_se_deve->mapped_lun, iport_ptr,1750 sa_res_key, all_tg_pt, aptpl);1751 if (!dest_pr_reg) {1752 core_scsi3_lunacl_undepend_item(dest_se_deve);1753 core_scsi3_nodeacl_undepend_item(dest_node_acl);1754 core_scsi3_tpg_undepend_item(dest_tpg);1755 kfree(tidh_new);1756 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;1757 goto out_unmap;1758 }1759 tidh_new->dest_pr_reg = dest_pr_reg;1760 list_add_tail(&tidh_new->dest_list, &tid_dest_list);1761 1762 ptr += tid_len;1763 tpdl -= tid_len;1764 tid_len = 0;1765 1766 }1767 1768 transport_kunmap_data_sg(cmd);1769 1770 /*1771 * Go ahead and create a registrations from tid_dest_list for the1772 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl1773 * and dest_se_deve.1774 *1775 * The SA Reservation Key from the PROUT is set for the1776 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=11777 * means that the TransportID Initiator port will be1778 * registered on all of the target ports in the SCSI target device1779 * ALL_TG_PT=0 means the registration will only be for the1780 * SCSI target port the PROUT REGISTER with SPEC_I_PT=11781 * was received.1782 */1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {1784 dest_tpg = tidh->dest_tpg;1785 dest_node_acl = tidh->dest_node_acl;1786 dest_se_deve = tidh->dest_se_deve;1787 dest_pr_reg = tidh->dest_pr_reg;1788 1789 list_del(&tidh->dest_list);1790 kfree(tidh);1791 1792 memset(i_buf, 0, PR_REG_ISID_ID_LEN);1793 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);1794 1795 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,1796 dest_pr_reg, 0, 0);1797 1798 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"1799 " registered Transport ID for Node: %s%s Mapped LUN:"1800 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name,1801 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?1802 dest_se_deve->mapped_lun : 0);1803 1804 if (dest_pr_reg == local_pr_reg)1805 continue;1806 1807 core_scsi3_nodeacl_undepend_item(dest_node_acl);1808 core_scsi3_tpg_undepend_item(dest_tpg);1809 }1810 1811 return 0;1812out_unmap:1813 transport_kunmap_data_sg(cmd);1814out:1815 /*1816 * For the failure case, release everything from tid_dest_list1817 * including *dest_pr_reg and the configfs dependances..1818 */1819 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {1820 bool is_local = false;1821 1822 dest_tpg = tidh->dest_tpg;1823 dest_node_acl = tidh->dest_node_acl;1824 dest_se_deve = tidh->dest_se_deve;1825 dest_pr_reg = tidh->dest_pr_reg;1826 1827 if (dest_pr_reg == local_pr_reg)1828 is_local = true;1829 1830 list_del(&tidh->dest_list);1831 kfree(tidh);1832 /*1833 * Release any extra ALL_TG_PT=1 registrations for1834 * the SPEC_I_PT=1 case.1835 */1836 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,1837 &dest_pr_reg->pr_reg_atp_list,1838 pr_reg_atp_mem_list) {1839 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);1840 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);1841 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);1842 }1843 1844 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);1845 core_scsi3_lunacl_undepend_item(dest_se_deve);1846 1847 if (is_local)1848 continue;1849 1850 core_scsi3_nodeacl_undepend_item(dest_node_acl);1851 core_scsi3_tpg_undepend_item(dest_tpg);1852 }1853 return ret;1854}1855 1856static int core_scsi3_update_aptpl_buf(1857 struct se_device *dev,1858 unsigned char *buf,1859 u32 pr_aptpl_buf_len)1860{1861 struct se_portal_group *tpg;1862 struct t10_pr_registration *pr_reg;1863 unsigned char tmp[512], isid_buf[32];1864 ssize_t len = 0;1865 int reg_count = 0;1866 int ret = 0;1867 1868 spin_lock(&dev->dev_reservation_lock);1869 spin_lock(&dev->t10_pr.registration_lock);1870 /*1871 * Walk the registration list..1872 */1873 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,1874 pr_reg_list) {1875 1876 tmp[0] = '\0';1877 isid_buf[0] = '\0';1878 tpg = pr_reg->pr_reg_nacl->se_tpg;1879 /*1880 * Write out any ISID value to APTPL metadata that was included1881 * in the original registration.1882 */1883 if (pr_reg->isid_present_at_reg)1884 snprintf(isid_buf, 32, "initiator_sid=%s\n",1885 pr_reg->pr_reg_isid);1886 /*1887 * Include special metadata if the pr_reg matches the1888 * reservation holder.1889 */1890 if (dev->dev_pr_res_holder == pr_reg) {1891 snprintf(tmp, 512, "PR_REG_START: %d"1892 "\ninitiator_fabric=%s\n"1893 "initiator_node=%s\n%s"1894 "sa_res_key=%llu\n"1895 "res_holder=1\nres_type=%02x\n"1896 "res_scope=%02x\nres_all_tg_pt=%d\n"1897 "mapped_lun=%llu\n", reg_count,1898 tpg->se_tpg_tfo->fabric_name,1899 pr_reg->pr_reg_nacl->initiatorname, isid_buf,1900 pr_reg->pr_res_key, pr_reg->pr_res_type,1901 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,1902 pr_reg->pr_res_mapped_lun);1903 } else {1904 snprintf(tmp, 512, "PR_REG_START: %d\n"1905 "initiator_fabric=%s\ninitiator_node=%s\n%s"1906 "sa_res_key=%llu\nres_holder=0\n"1907 "res_all_tg_pt=%d\nmapped_lun=%llu\n",1908 reg_count, tpg->se_tpg_tfo->fabric_name,1909 pr_reg->pr_reg_nacl->initiatorname, isid_buf,1910 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,1911 pr_reg->pr_res_mapped_lun);1912 }1913 1914 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {1915 pr_err("Unable to update renaming APTPL metadata,"1916 " reallocating larger buffer\n");1917 ret = -EMSGSIZE;1918 goto out;1919 }1920 len += sprintf(buf+len, "%s", tmp);1921 1922 /*1923 * Include information about the associated SCSI target port.1924 */1925 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"1926 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"1927 " %d\n", tpg->se_tpg_tfo->fabric_name,1928 tpg->se_tpg_tfo->tpg_get_wwn(tpg),1929 tpg->se_tpg_tfo->tpg_get_tag(tpg),1930 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,1931 reg_count);1932 1933 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {1934 pr_err("Unable to update renaming APTPL metadata,"1935 " reallocating larger buffer\n");1936 ret = -EMSGSIZE;1937 goto out;1938 }1939 len += sprintf(buf+len, "%s", tmp);1940 reg_count++;1941 }1942 1943 if (!reg_count)1944 len += sprintf(buf+len, "No Registrations or Reservations");1945 1946out:1947 spin_unlock(&dev->t10_pr.registration_lock);1948 spin_unlock(&dev->dev_reservation_lock);1949 1950 return ret;1951}1952 1953static int __core_scsi3_write_aptpl_to_file(1954 struct se_device *dev,1955 unsigned char *buf)1956{1957 struct t10_wwn *wwn = &dev->t10_wwn;1958 struct file *file;1959 int flags = O_RDWR | O_CREAT | O_TRUNC;1960 char *path;1961 u32 pr_aptpl_buf_len;1962 int ret;1963 loff_t pos = 0;1964 1965 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,1966 &wwn->unit_serial[0]);1967 if (!path)1968 return -ENOMEM;1969 1970 file = filp_open(path, flags, 0600);1971 if (IS_ERR(file)) {1972 pr_err("filp_open(%s) for APTPL metadata"1973 " failed\n", path);1974 kfree(path);1975 return PTR_ERR(file);1976 }1977 1978 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */1979 1980 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);1981 1982 if (ret < 0)1983 pr_debug("Error writing APTPL metadata file: %s\n", path);1984 fput(file);1985 kfree(path);1986 1987 return (ret < 0) ? -EIO : 0;1988}1989 1990/*1991 * Clear the APTPL metadata if APTPL has been disabled, otherwise1992 * write out the updated metadata to struct file for this SCSI device.1993 */1994static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)1995{1996 unsigned char *buf;1997 int rc, len = PR_APTPL_BUF_LEN;1998 1999 if (!aptpl) {2000 char *null_buf = "No Registrations or Reservations\n";2001 2002 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);2003 dev->t10_pr.pr_aptpl_active = 0;2004 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");2005 2006 if (rc)2007 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2008 2009 return 0;2010 }2011retry:2012 buf = vzalloc(len);2013 if (!buf)2014 return TCM_OUT_OF_RESOURCES;2015 2016 rc = core_scsi3_update_aptpl_buf(dev, buf, len);2017 if (rc < 0) {2018 vfree(buf);2019 len *= 2;2020 goto retry;2021 }2022 2023 rc = __core_scsi3_write_aptpl_to_file(dev, buf);2024 if (rc != 0) {2025 pr_err("SPC-3 PR: Could not update APTPL\n");2026 vfree(buf);2027 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2028 }2029 dev->t10_pr.pr_aptpl_active = 1;2030 vfree(buf);2031 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");2032 return 0;2033}2034 2035static sense_reason_t2036core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,2037 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)2038{2039 struct se_session *se_sess = cmd->se_sess;2040 struct se_device *dev = cmd->se_dev;2041 struct se_lun *se_lun = cmd->se_lun;2042 struct se_portal_group *se_tpg;2043 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;2044 struct t10_reservation *pr_tmpl = &dev->t10_pr;2045 unsigned char isid_buf[PR_REG_ISID_LEN] = { };2046 unsigned char *isid_ptr = NULL;2047 sense_reason_t ret = TCM_NO_SENSE;2048 int pr_holder = 0, type;2049 2050 if (!se_sess || !se_lun) {2051 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");2052 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2053 }2054 se_tpg = se_sess->se_tpg;2055 2056 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {2057 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],2058 PR_REG_ISID_LEN);2059 isid_ptr = &isid_buf[0];2060 }2061 /*2062 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 472063 */2064 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);2065 if (!pr_reg) {2066 if (res_key) {2067 pr_warn("SPC-3 PR: Reservation Key non-zero"2068 " for SA REGISTER, returning CONFLICT\n");2069 return TCM_RESERVATION_CONFLICT;2070 }2071 /*2072 * Do nothing but return GOOD status.2073 */2074 if (!sa_res_key)2075 return 0;2076 2077 if (!spec_i_pt) {2078 /*2079 * Perform the Service Action REGISTER on the Initiator2080 * Port Endpoint that the PRO was received from on the2081 * Logical Unit of the SCSI device server.2082 */2083 if (core_scsi3_alloc_registration(cmd->se_dev,2084 se_sess->se_node_acl, cmd->se_lun,2085 NULL, cmd->orig_fe_lun, isid_ptr,2086 sa_res_key, all_tg_pt, aptpl,2087 register_type, 0)) {2088 pr_err("Unable to allocate"2089 " struct t10_pr_registration\n");2090 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;2091 }2092 } else {2093 /*2094 * Register both the Initiator port that received2095 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI2096 * TransportID from Parameter list and loop through2097 * fabric dependent parameter list while calling2098 * logic from of core_scsi3_alloc_registration() for2099 * each TransportID provided SCSI Initiator Port/Device2100 */2101 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,2102 isid_ptr, sa_res_key, all_tg_pt, aptpl);2103 if (ret != 0)2104 return ret;2105 }2106 return core_scsi3_update_and_write_aptpl(dev, aptpl);2107 }2108 2109 /* ok, existing registration */2110 2111 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {2112 pr_err("SPC-3 PR REGISTER: Received"2113 " res_key: 0x%016Lx does not match"2114 " existing SA REGISTER res_key:"2115 " 0x%016Lx\n", res_key,2116 pr_reg->pr_res_key);2117 ret = TCM_RESERVATION_CONFLICT;2118 goto out;2119 }2120 2121 if (spec_i_pt) {2122 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"2123 " set on a registered nexus\n");2124 ret = TCM_INVALID_PARAMETER_LIST;2125 goto out;2126 }2127 2128 /*2129 * An existing ALL_TG_PT=1 registration being released2130 * must also set ALL_TG_PT=1 in the incoming PROUT.2131 */2132 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {2133 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"2134 " registration exists, but ALL_TG_PT=1 bit not"2135 " present in received PROUT\n");2136 ret = TCM_INVALID_CDB_FIELD;2137 goto out;2138 }2139 2140 /*2141 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.2142 */2143 if (sa_res_key) {2144 /*2145 * Increment PRgeneration counter for struct se_device"2146 * upon a successful REGISTER, see spc4r17 section 6.3.22147 * READ_KEYS service action.2148 */2149 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);2150 pr_reg->pr_res_key = sa_res_key;2151 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"2152 " Key for %s to: 0x%016Lx PRgeneration:"2153 " 0x%08x\n", cmd->se_tfo->fabric_name,2154 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",2155 pr_reg->pr_reg_nacl->initiatorname,2156 pr_reg->pr_res_key, pr_reg->pr_res_generation);2157 2158 } else {2159 /*2160 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.2161 */2162 type = pr_reg->pr_res_type;2163 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,2164 pr_reg);2165 if (pr_holder < 0) {2166 ret = TCM_RESERVATION_CONFLICT;2167 goto out;2168 }2169 2170 spin_lock(&pr_tmpl->registration_lock);2171 /*2172 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port2173 * and matching pr_res_key.2174 */2175 if (pr_reg->pr_reg_all_tg_pt) {2176 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,2177 &pr_tmpl->registration_list,2178 pr_reg_list) {2179 2180 if (!pr_reg_p->pr_reg_all_tg_pt)2181 continue;2182 if (pr_reg_p->pr_res_key != res_key)2183 continue;2184 if (pr_reg == pr_reg_p)2185 continue;2186 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,2187 pr_reg_p->pr_reg_nacl->initiatorname))2188 continue;2189 2190 __core_scsi3_free_registration(dev,2191 pr_reg_p, NULL, 0);2192 }2193 }2194 2195 /*2196 * Release the calling I_T Nexus registration now..2197 */2198 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);2199 pr_reg = NULL;2200 2201 /*2202 * From spc4r17, section 5.7.11.3 Unregistering2203 *2204 * If the persistent reservation is a registrants only2205 * type, the device server shall establish a unit2206 * attention condition for the initiator port associated2207 * with every registered I_T nexus except for the I_T2208 * nexus on which the PERSISTENT RESERVE OUT command was2209 * received, with the additional sense code set to2210 * RESERVATIONS RELEASED.2211 */2212 if (pr_holder &&2213 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||2214 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {2215 list_for_each_entry(pr_reg_p,2216 &pr_tmpl->registration_list,2217 pr_reg_list) {2218 2219 target_ua_allocate_lun(2220 pr_reg_p->pr_reg_nacl,2221 pr_reg_p->pr_res_mapped_lun,2222 0x2A,2223 ASCQ_2AH_RESERVATIONS_RELEASED);2224 }2225 }2226 2227 spin_unlock(&pr_tmpl->registration_lock);2228 }2229 2230 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);2231 2232out:2233 if (pr_reg)2234 core_scsi3_put_pr_reg(pr_reg);2235 return ret;2236}2237 2238unsigned char *core_scsi3_pr_dump_type(int type)2239{2240 switch (type) {2241 case PR_TYPE_WRITE_EXCLUSIVE:2242 return "Write Exclusive Access";2243 case PR_TYPE_EXCLUSIVE_ACCESS:2244 return "Exclusive Access";2245 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:2246 return "Write Exclusive Access, Registrants Only";2247 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:2248 return "Exclusive Access, Registrants Only";2249 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:2250 return "Write Exclusive Access, All Registrants";2251 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:2252 return "Exclusive Access, All Registrants";2253 default:2254 break;2255 }2256 2257 return "Unknown SPC-3 PR Type";2258}2259 2260static sense_reason_t2261core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)2262{2263 struct se_device *dev = cmd->se_dev;2264 struct se_session *se_sess = cmd->se_sess;2265 struct se_lun *se_lun = cmd->se_lun;2266 struct t10_pr_registration *pr_reg, *pr_res_holder;2267 struct t10_reservation *pr_tmpl = &dev->t10_pr;2268 char i_buf[PR_REG_ISID_ID_LEN] = { };2269 sense_reason_t ret;2270 2271 if (!se_sess || !se_lun) {2272 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");2273 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2274 }2275 /*2276 * Locate the existing *pr_reg via struct se_node_acl pointers2277 */2278 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,2279 se_sess);2280 if (!pr_reg) {2281 pr_err("SPC-3 PR: Unable to locate"2282 " PR_REGISTERED *pr_reg for RESERVE\n");2283 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2284 }2285 /*2286 * From spc4r17 Section 5.7.9: Reserving:2287 *2288 * An application client creates a persistent reservation by issuing2289 * a PERSISTENT RESERVE OUT command with RESERVE service action through2290 * a registered I_T nexus with the following parameters:2291 * a) RESERVATION KEY set to the value of the reservation key that is2292 * registered with the logical unit for the I_T nexus; and2293 */2294 if (res_key != pr_reg->pr_res_key) {2295 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"2296 " does not match existing SA REGISTER res_key:"2297 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);2298 ret = TCM_RESERVATION_CONFLICT;2299 goto out_put_pr_reg;2300 }2301 /*2302 * From spc4r17 Section 5.7.9: Reserving:2303 *2304 * From above:2305 * b) TYPE field and SCOPE field set to the persistent reservation2306 * being created.2307 *2308 * Only one persistent reservation is allowed at a time per logical unit2309 * and that persistent reservation has a scope of LU_SCOPE.2310 */2311 if (scope != PR_SCOPE_LU_SCOPE) {2312 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);2313 ret = TCM_INVALID_PARAMETER_LIST;2314 goto out_put_pr_reg;2315 }2316 /*2317 * See if we have an existing PR reservation holder pointer at2318 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration2319 * *pr_res_holder.2320 */2321 spin_lock(&dev->dev_reservation_lock);2322 pr_res_holder = dev->dev_pr_res_holder;2323 if (pr_res_holder) {2324 /*2325 * From spc4r17 Section 5.7.9: Reserving:2326 *2327 * If the device server receives a PERSISTENT RESERVE OUT2328 * command from an I_T nexus other than a persistent reservation2329 * holder (see 5.7.10) that attempts to create a persistent2330 * reservation when a persistent reservation already exists for2331 * the logical unit, then the command shall be completed with2332 * RESERVATION CONFLICT status.2333 */2334 if (!is_reservation_holder(pr_res_holder, pr_reg)) {2335 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;2336 pr_err("SPC-3 PR: Attempted RESERVE from"2337 " [%s]: %s while reservation already held by"2338 " [%s]: %s, returning RESERVATION_CONFLICT\n",2339 cmd->se_tfo->fabric_name,2340 se_sess->se_node_acl->initiatorname,2341 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,2342 pr_res_holder->pr_reg_nacl->initiatorname);2343 2344 spin_unlock(&dev->dev_reservation_lock);2345 ret = TCM_RESERVATION_CONFLICT;2346 goto out_put_pr_reg;2347 }2348 /*2349 * From spc4r17 Section 5.7.9: Reserving:2350 *2351 * If a persistent reservation holder attempts to modify the2352 * type or scope of an existing persistent reservation, the2353 * command shall be completed with RESERVATION CONFLICT status.2354 */2355 if ((pr_res_holder->pr_res_type != type) ||2356 (pr_res_holder->pr_res_scope != scope)) {2357 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;2358 pr_err("SPC-3 PR: Attempted RESERVE from"2359 " [%s]: %s trying to change TYPE and/or SCOPE,"2360 " while reservation already held by [%s]: %s,"2361 " returning RESERVATION_CONFLICT\n",2362 cmd->se_tfo->fabric_name,2363 se_sess->se_node_acl->initiatorname,2364 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,2365 pr_res_holder->pr_reg_nacl->initiatorname);2366 2367 spin_unlock(&dev->dev_reservation_lock);2368 ret = TCM_RESERVATION_CONFLICT;2369 goto out_put_pr_reg;2370 }2371 /*2372 * From spc4r17 Section 5.7.9: Reserving:2373 *2374 * If the device server receives a PERSISTENT RESERVE OUT2375 * command with RESERVE service action where the TYPE field and2376 * the SCOPE field contain the same values as the existing type2377 * and scope from a persistent reservation holder, it shall not2378 * make any change to the existing persistent reservation and2379 * shall completethe command with GOOD status.2380 */2381 spin_unlock(&dev->dev_reservation_lock);2382 ret = 0;2383 goto out_put_pr_reg;2384 }2385 /*2386 * Otherwise, our *pr_reg becomes the PR reservation holder for said2387 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.2388 */2389 pr_reg->pr_res_scope = scope;2390 pr_reg->pr_res_type = type;2391 pr_reg->pr_res_holder = 1;2392 dev->dev_pr_res_holder = pr_reg;2393 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);2394 2395 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"2396 " reservation holder TYPE: %s ALL_TG_PT: %d\n",2397 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),2398 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);2399 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",2400 cmd->se_tfo->fabric_name,2401 se_sess->se_node_acl->initiatorname,2402 i_buf);2403 spin_unlock(&dev->dev_reservation_lock);2404 2405 if (pr_tmpl->pr_aptpl_active)2406 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);2407 2408 ret = 0;2409out_put_pr_reg:2410 core_scsi3_put_pr_reg(pr_reg);2411 return ret;2412}2413 2414static sense_reason_t2415core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,2416 u64 res_key)2417{2418 switch (type) {2419 case PR_TYPE_WRITE_EXCLUSIVE:2420 case PR_TYPE_EXCLUSIVE_ACCESS:2421 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:2422 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:2423 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:2424 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:2425 return core_scsi3_pro_reserve(cmd, type, scope, res_key);2426 default:2427 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"2428 " 0x%02x\n", type);2429 return TCM_INVALID_CDB_FIELD;2430 }2431}2432 2433static void __core_scsi3_complete_pro_release(2434 struct se_device *dev,2435 struct se_node_acl *se_nacl,2436 struct t10_pr_registration *pr_reg,2437 int explicit,2438 int unreg)2439{2440 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;2441 char i_buf[PR_REG_ISID_ID_LEN] = { };2442 int pr_res_type = 0, pr_res_scope = 0;2443 2444 lockdep_assert_held(&dev->dev_reservation_lock);2445 2446 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);2447 /*2448 * Go ahead and release the current PR reservation holder.2449 * If an All Registrants reservation is currently active and2450 * a unregister operation is requested, replace the current2451 * dev_pr_res_holder with another active registration.2452 */2453 if (dev->dev_pr_res_holder) {2454 pr_res_type = dev->dev_pr_res_holder->pr_res_type;2455 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;2456 dev->dev_pr_res_holder->pr_res_type = 0;2457 dev->dev_pr_res_holder->pr_res_scope = 0;2458 dev->dev_pr_res_holder->pr_res_holder = 0;2459 dev->dev_pr_res_holder = NULL;2460 }2461 if (!unreg)2462 goto out;2463 2464 spin_lock(&dev->t10_pr.registration_lock);2465 list_del_init(&pr_reg->pr_reg_list);2466 /*2467 * If the I_T nexus is a reservation holder, the persistent reservation2468 * is of an all registrants type, and the I_T nexus is the last remaining2469 * registered I_T nexus, then the device server shall also release the2470 * persistent reservation.2471 */2472 if (!list_empty(&dev->t10_pr.registration_list) &&2473 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||2474 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {2475 dev->dev_pr_res_holder =2476 list_entry(dev->t10_pr.registration_list.next,2477 struct t10_pr_registration, pr_reg_list);2478 dev->dev_pr_res_holder->pr_res_type = pr_res_type;2479 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;2480 dev->dev_pr_res_holder->pr_res_holder = 1;2481 }2482 spin_unlock(&dev->t10_pr.registration_lock);2483out:2484 if (!dev->dev_pr_res_holder) {2485 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"2486 " reservation holder TYPE: %s ALL_TG_PT: %d\n",2487 tfo->fabric_name, (explicit) ? "explicit" :2488 "implicit", core_scsi3_pr_dump_type(pr_res_type),2489 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);2490 }2491 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",2492 tfo->fabric_name, se_nacl->initiatorname,2493 i_buf);2494 /*2495 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE2496 */2497 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;2498}2499 2500static sense_reason_t2501core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,2502 u64 res_key)2503{2504 struct se_device *dev = cmd->se_dev;2505 struct se_session *se_sess = cmd->se_sess;2506 struct se_lun *se_lun = cmd->se_lun;2507 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;2508 struct t10_reservation *pr_tmpl = &dev->t10_pr;2509 sense_reason_t ret = 0;2510 2511 if (!se_sess || !se_lun) {2512 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");2513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2514 }2515 /*2516 * Locate the existing *pr_reg via struct se_node_acl pointers2517 */2518 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);2519 if (!pr_reg) {2520 pr_err("SPC-3 PR: Unable to locate"2521 " PR_REGISTERED *pr_reg for RELEASE\n");2522 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2523 }2524 /*2525 * From spc4r17 Section 5.7.11.2 Releasing:2526 *2527 * If there is no persistent reservation or in response to a persistent2528 * reservation release request from a registered I_T nexus that is not a2529 * persistent reservation holder (see 5.7.10), the device server shall2530 * do the following:2531 *2532 * a) Not release the persistent reservation, if any;2533 * b) Not remove any registrations; and2534 * c) Complete the command with GOOD status.2535 */2536 spin_lock(&dev->dev_reservation_lock);2537 pr_res_holder = dev->dev_pr_res_holder;2538 if (!pr_res_holder) {2539 /*2540 * No persistent reservation, return GOOD status.2541 */2542 spin_unlock(&dev->dev_reservation_lock);2543 goto out_put_pr_reg;2544 }2545 2546 if (!is_reservation_holder(pr_res_holder, pr_reg)) {2547 /*2548 * Release request from a registered I_T nexus that is not a2549 * persistent reservation holder. return GOOD status.2550 */2551 spin_unlock(&dev->dev_reservation_lock);2552 goto out_put_pr_reg;2553 }2554 2555 /*2556 * From spc4r17 Section 5.7.11.2 Releasing:2557 *2558 * Only the persistent reservation holder (see 5.7.10) is allowed to2559 * release a persistent reservation.2560 *2561 * An application client releases the persistent reservation by issuing2562 * a PERSISTENT RESERVE OUT command with RELEASE service action through2563 * an I_T nexus that is a persistent reservation holder with the2564 * following parameters:2565 *2566 * a) RESERVATION KEY field set to the value of the reservation key2567 * that is registered with the logical unit for the I_T nexus;2568 */2569 if (res_key != pr_reg->pr_res_key) {2570 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"2571 " does not match existing SA REGISTER res_key:"2572 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);2573 spin_unlock(&dev->dev_reservation_lock);2574 ret = TCM_RESERVATION_CONFLICT;2575 goto out_put_pr_reg;2576 }2577 /*2578 * From spc4r17 Section 5.7.11.2 Releasing and above:2579 *2580 * b) TYPE field and SCOPE field set to match the persistent2581 * reservation being released.2582 */2583 if ((pr_res_holder->pr_res_type != type) ||2584 (pr_res_holder->pr_res_scope != scope)) {2585 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;2586 pr_err("SPC-3 PR RELEASE: Attempted to release"2587 " reservation from [%s]: %s with different TYPE "2588 "and/or SCOPE while reservation already held by"2589 " [%s]: %s, returning RESERVATION_CONFLICT\n",2590 cmd->se_tfo->fabric_name,2591 se_sess->se_node_acl->initiatorname,2592 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,2593 pr_res_holder->pr_reg_nacl->initiatorname);2594 2595 spin_unlock(&dev->dev_reservation_lock);2596 ret = TCM_RESERVATION_CONFLICT;2597 goto out_put_pr_reg;2598 }2599 /*2600 * In response to a persistent reservation release request from the2601 * persistent reservation holder the device server shall perform a2602 * release by doing the following as an uninterrupted series of actions:2603 * a) Release the persistent reservation;2604 * b) Not remove any registration(s);2605 * c) If the released persistent reservation is a registrants only type2606 * or all registrants type persistent reservation,2607 * the device server shall establish a unit attention condition for2608 * the initiator port associated with every regis-2609 * tered I_T nexus other than I_T nexus on which the PERSISTENT2610 * RESERVE OUT command with RELEASE service action was received,2611 * with the additional sense code set to RESERVATIONS RELEASED; and2612 * d) If the persistent reservation is of any other type, the device2613 * server shall not establish a unit attention condition.2614 */2615 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,2616 pr_reg, 1, 0);2617 2618 spin_unlock(&dev->dev_reservation_lock);2619 2620 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&2621 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&2622 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&2623 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {2624 /*2625 * If no UNIT ATTENTION conditions will be established for2626 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS2627 * go ahead and check for APTPL=1 update+write below2628 */2629 goto write_aptpl;2630 }2631 2632 spin_lock(&pr_tmpl->registration_lock);2633 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,2634 pr_reg_list) {2635 /*2636 * Do not establish a UNIT ATTENTION condition2637 * for the calling I_T Nexus2638 */2639 if (pr_reg_p == pr_reg)2640 continue;2641 2642 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,2643 pr_reg_p->pr_res_mapped_lun,2644 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);2645 }2646 spin_unlock(&pr_tmpl->registration_lock);2647 2648write_aptpl:2649 if (pr_tmpl->pr_aptpl_active)2650 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);2651 2652out_put_pr_reg:2653 core_scsi3_put_pr_reg(pr_reg);2654 return ret;2655}2656 2657static sense_reason_t2658core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)2659{2660 struct se_device *dev = cmd->se_dev;2661 struct se_node_acl *pr_reg_nacl;2662 struct se_session *se_sess = cmd->se_sess;2663 struct t10_reservation *pr_tmpl = &dev->t10_pr;2664 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;2665 u64 pr_res_mapped_lun = 0;2666 int calling_it_nexus = 0;2667 /*2668 * Locate the existing *pr_reg via struct se_node_acl pointers2669 */2670 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,2671 se_sess->se_node_acl, se_sess);2672 if (!pr_reg_n) {2673 pr_err("SPC-3 PR: Unable to locate"2674 " PR_REGISTERED *pr_reg for CLEAR\n");2675 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2676 }2677 /*2678 * From spc4r17 section 5.7.11.6, Clearing:2679 *2680 * Any application client may release the persistent reservation and2681 * remove all registrations from a device server by issuing a2682 * PERSISTENT RESERVE OUT command with CLEAR service action through a2683 * registered I_T nexus with the following parameter:2684 *2685 * a) RESERVATION KEY field set to the value of the reservation key2686 * that is registered with the logical unit for the I_T nexus.2687 */2688 if (res_key != pr_reg_n->pr_res_key) {2689 pr_err("SPC-3 PR REGISTER: Received"2690 " res_key: 0x%016Lx does not match"2691 " existing SA REGISTER res_key:"2692 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);2693 core_scsi3_put_pr_reg(pr_reg_n);2694 return TCM_RESERVATION_CONFLICT;2695 }2696 /*2697 * a) Release the persistent reservation, if any;2698 */2699 spin_lock(&dev->dev_reservation_lock);2700 pr_res_holder = dev->dev_pr_res_holder;2701 if (pr_res_holder) {2702 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;2703 __core_scsi3_complete_pro_release(dev, pr_res_nacl,2704 pr_res_holder, 0, 0);2705 }2706 spin_unlock(&dev->dev_reservation_lock);2707 /*2708 * b) Remove all registration(s) (see spc4r17 5.7.7);2709 */2710 spin_lock(&pr_tmpl->registration_lock);2711 list_for_each_entry_safe(pr_reg, pr_reg_tmp,2712 &pr_tmpl->registration_list, pr_reg_list) {2713 2714 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;2715 pr_reg_nacl = pr_reg->pr_reg_nacl;2716 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;2717 __core_scsi3_free_registration(dev, pr_reg, NULL,2718 calling_it_nexus);2719 /*2720 * e) Establish a unit attention condition for the initiator2721 * port associated with every registered I_T nexus other2722 * than the I_T nexus on which the PERSISTENT RESERVE OUT2723 * command with CLEAR service action was received, with the2724 * additional sense code set to RESERVATIONS PREEMPTED.2725 */2726 if (!calling_it_nexus)2727 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,2728 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);2729 }2730 spin_unlock(&pr_tmpl->registration_lock);2731 2732 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",2733 cmd->se_tfo->fabric_name);2734 2735 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);2736 2737 core_scsi3_pr_generation(dev);2738 return 0;2739}2740 2741static void __core_scsi3_complete_pro_preempt(2742 struct se_device *dev,2743 struct t10_pr_registration *pr_reg,2744 struct list_head *preempt_and_abort_list,2745 int type,2746 int scope,2747 enum preempt_type preempt_type)2748{2749 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;2750 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;2751 char i_buf[PR_REG_ISID_ID_LEN] = { };2752 2753 lockdep_assert_held(&dev->dev_reservation_lock);2754 2755 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);2756 /*2757 * Do an implicit RELEASE of the existing reservation.2758 */2759 if (dev->dev_pr_res_holder)2760 __core_scsi3_complete_pro_release(dev, nacl,2761 dev->dev_pr_res_holder, 0, 0);2762 2763 dev->dev_pr_res_holder = pr_reg;2764 pr_reg->pr_res_holder = 1;2765 pr_reg->pr_res_type = type;2766 pr_reg->pr_res_scope = scope;2767 2768 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"2769 " reservation holder TYPE: %s ALL_TG_PT: %d\n",2770 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",2771 core_scsi3_pr_dump_type(type),2772 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);2773 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",2774 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",2775 nacl->initiatorname, i_buf);2776 /*2777 * For PREEMPT_AND_ABORT, add the preempting reservation's2778 * struct t10_pr_registration to the list that will be compared2779 * against received CDBs..2780 */2781 if (preempt_and_abort_list)2782 list_add_tail(&pr_reg->pr_reg_abort_list,2783 preempt_and_abort_list);2784}2785 2786static void core_scsi3_release_preempt_and_abort(2787 struct list_head *preempt_and_abort_list,2788 struct t10_pr_registration *pr_reg_holder)2789{2790 struct t10_pr_registration *pr_reg, *pr_reg_tmp;2791 2792 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,2793 pr_reg_abort_list) {2794 2795 list_del(&pr_reg->pr_reg_abort_list);2796 if (pr_reg_holder == pr_reg)2797 continue;2798 if (pr_reg->pr_res_holder) {2799 pr_warn("pr_reg->pr_res_holder still set\n");2800 continue;2801 }2802 2803 pr_reg->pr_reg_deve = NULL;2804 pr_reg->pr_reg_nacl = NULL;2805 kmem_cache_free(t10_pr_reg_cache, pr_reg);2806 }2807}2808 2809static sense_reason_t2810core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,2811 u64 sa_res_key, enum preempt_type preempt_type)2812{2813 struct se_device *dev = cmd->se_dev;2814 struct se_node_acl *pr_reg_nacl;2815 struct se_session *se_sess = cmd->se_sess;2816 LIST_HEAD(preempt_and_abort_list);2817 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;2818 struct t10_reservation *pr_tmpl = &dev->t10_pr;2819 u64 pr_res_mapped_lun = 0;2820 int all_reg = 0, calling_it_nexus = 0;2821 bool sa_res_key_unmatched = sa_res_key != 0;2822 int prh_type = 0, prh_scope = 0;2823 2824 if (!se_sess)2825 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;2826 2827 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,2828 se_sess);2829 if (!pr_reg_n) {2830 pr_err("SPC-3 PR: Unable to locate"2831 " PR_REGISTERED *pr_reg for PREEMPT%s\n",2832 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");2833 return TCM_RESERVATION_CONFLICT;2834 }2835 if (pr_reg_n->pr_res_key != res_key) {2836 core_scsi3_put_pr_reg(pr_reg_n);2837 return TCM_RESERVATION_CONFLICT;2838 }2839 if (scope != PR_SCOPE_LU_SCOPE) {2840 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);2841 core_scsi3_put_pr_reg(pr_reg_n);2842 return TCM_INVALID_PARAMETER_LIST;2843 }2844 2845 spin_lock(&dev->dev_reservation_lock);2846 pr_res_holder = dev->dev_pr_res_holder;2847 if (pr_res_holder &&2848 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||2849 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))2850 all_reg = 1;2851 2852 if (!all_reg && !sa_res_key) {2853 spin_unlock(&dev->dev_reservation_lock);2854 core_scsi3_put_pr_reg(pr_reg_n);2855 return TCM_INVALID_PARAMETER_LIST;2856 }2857 /*2858 * From spc4r17, section 5.7.11.4.4 Removing Registrations:2859 *2860 * If the SERVICE ACTION RESERVATION KEY field does not identify a2861 * persistent reservation holder or there is no persistent reservation2862 * holder (i.e., there is no persistent reservation), then the device2863 * server shall perform a preempt by doing the following in an2864 * uninterrupted series of actions. (See below..)2865 */2866 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {2867 /*2868 * No existing or SA Reservation Key matching reservations..2869 *2870 * PROUT SA PREEMPT with All Registrant type reservations are2871 * allowed to be processed without a matching SA Reservation Key2872 */2873 spin_lock(&pr_tmpl->registration_lock);2874 list_for_each_entry_safe(pr_reg, pr_reg_tmp,2875 &pr_tmpl->registration_list, pr_reg_list) {2876 /*2877 * Removing of registrations in non all registrants2878 * type reservations without a matching SA reservation2879 * key.2880 *2881 * a) Remove the registrations for all I_T nexuses2882 * specified by the SERVICE ACTION RESERVATION KEY2883 * field;2884 * b) Ignore the contents of the SCOPE and TYPE fields;2885 * c) Process tasks as defined in 5.7.1; and2886 * d) Establish a unit attention condition for the2887 * initiator port associated with every I_T nexus2888 * that lost its registration other than the I_T2889 * nexus on which the PERSISTENT RESERVE OUT command2890 * was received, with the additional sense code set2891 * to REGISTRATIONS PREEMPTED.2892 */2893 if (!all_reg) {2894 if (pr_reg->pr_res_key != sa_res_key)2895 continue;2896 sa_res_key_unmatched = false;2897 2898 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;2899 pr_reg_nacl = pr_reg->pr_reg_nacl;2900 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;2901 __core_scsi3_free_registration(dev, pr_reg,2902 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :2903 NULL, calling_it_nexus);2904 } else {2905 /*2906 * Case for any existing all registrants type2907 * reservation, follow logic in spc4r17 section2908 * 5.7.11.4 Preempting, Table 52 and Figure 7.2909 *2910 * For a ZERO SA Reservation key, release2911 * all other registrations and do an implicit2912 * release of active persistent reservation.2913 *2914 * For a non-ZERO SA Reservation key, only2915 * release the matching reservation key from2916 * registrations.2917 */2918 if ((sa_res_key) &&2919 (pr_reg->pr_res_key != sa_res_key))2920 continue;2921 sa_res_key_unmatched = false;2922 2923 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;2924 if (calling_it_nexus)2925 continue;2926 2927 pr_reg_nacl = pr_reg->pr_reg_nacl;2928 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;2929 __core_scsi3_free_registration(dev, pr_reg,2930 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :2931 NULL, 0);2932 }2933 if (!calling_it_nexus)2934 target_ua_allocate_lun(pr_reg_nacl,2935 pr_res_mapped_lun, 0x2A,2936 ASCQ_2AH_REGISTRATIONS_PREEMPTED);2937 }2938 spin_unlock(&pr_tmpl->registration_lock);2939 /*2940 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or2941 * a PREEMPT AND ABORT service action sets the SERVICE ACTION2942 * RESERVATION KEY field to a value that does not match any2943 * registered reservation key, then the device server shall2944 * complete the command with RESERVATION CONFLICT status.2945 */2946 if (sa_res_key_unmatched) {2947 spin_unlock(&dev->dev_reservation_lock);2948 core_scsi3_put_pr_reg(pr_reg_n);2949 return TCM_RESERVATION_CONFLICT;2950 }2951 /*2952 * For an existing all registrants type reservation2953 * with a zero SA rservation key, preempt the existing2954 * reservation with the new PR type and scope.2955 */2956 if (pr_res_holder && all_reg && !(sa_res_key)) {2957 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,2958 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,2959 type, scope, preempt_type);2960 }2961 2962 spin_unlock(&dev->dev_reservation_lock);2963 2964 /*2965 * SPC-4 5.12.11.2.6 Preempting and aborting2966 * The actions described in this subclause shall be performed2967 * for all I_T nexuses that are registered with the non-zero2968 * SERVICE ACTION RESERVATION KEY value, without regard for2969 * whether the preempted I_T nexuses hold the persistent2970 * reservation. If the SERVICE ACTION RESERVATION KEY field is2971 * set to zero and an all registrants persistent reservation is2972 * present, the device server shall abort all commands for all2973 * registered I_T nexuses.2974 */2975 if (preempt_type == PREEMPT_AND_ABORT) {2976 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list,2977 cmd);2978 core_scsi3_release_preempt_and_abort(2979 &preempt_and_abort_list, pr_reg_n);2980 }2981 2982 if (pr_tmpl->pr_aptpl_active)2983 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);2984 2985 core_scsi3_put_pr_reg(pr_reg_n);2986 core_scsi3_pr_generation(cmd->se_dev);2987 return 0;2988 }2989 /*2990 * The PREEMPTing SA reservation key matches that of the2991 * existing persistent reservation, first, we check if2992 * we are preempting our own reservation.2993 * From spc4r17, section 5.7.11.4.3 Preempting2994 * persistent reservations and registration handling2995 *2996 * If an all registrants persistent reservation is not2997 * present, it is not an error for the persistent2998 * reservation holder to preempt itself (i.e., a2999 * PERSISTENT RESERVE OUT with a PREEMPT service action3000 * or a PREEMPT AND ABORT service action with the3001 * SERVICE ACTION RESERVATION KEY value equal to the3002 * persistent reservation holder's reservation key that3003 * is received from the persistent reservation holder).3004 * In that case, the device server shall establish the3005 * new persistent reservation and maintain the3006 * registration.3007 */3008 prh_type = pr_res_holder->pr_res_type;3009 prh_scope = pr_res_holder->pr_res_scope;3010 /*3011 * If the SERVICE ACTION RESERVATION KEY field identifies a3012 * persistent reservation holder (see 5.7.10), the device3013 * server shall perform a preempt by doing the following as3014 * an uninterrupted series of actions:3015 *3016 * a) Release the persistent reservation for the holder3017 * identified by the SERVICE ACTION RESERVATION KEY field;3018 */3019 if (pr_reg_n != pr_res_holder)3020 __core_scsi3_complete_pro_release(dev,3021 pr_res_holder->pr_reg_nacl,3022 dev->dev_pr_res_holder, 0, 0);3023 /*3024 * b) Remove the registrations for all I_T nexuses identified3025 * by the SERVICE ACTION RESERVATION KEY field, except the3026 * I_T nexus that is being used for the PERSISTENT RESERVE3027 * OUT command. If an all registrants persistent reservation3028 * is present and the SERVICE ACTION RESERVATION KEY field3029 * is set to zero, then all registrations shall be removed3030 * except for that of the I_T nexus that is being used for3031 * the PERSISTENT RESERVE OUT command;3032 */3033 spin_lock(&pr_tmpl->registration_lock);3034 list_for_each_entry_safe(pr_reg, pr_reg_tmp,3035 &pr_tmpl->registration_list, pr_reg_list) {3036 3037 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;3038 if (calling_it_nexus)3039 continue;3040 3041 if (sa_res_key && pr_reg->pr_res_key != sa_res_key)3042 continue;3043 3044 pr_reg_nacl = pr_reg->pr_reg_nacl;3045 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;3046 __core_scsi3_free_registration(dev, pr_reg,3047 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,3048 calling_it_nexus);3049 /*3050 * e) Establish a unit attention condition for the initiator3051 * port associated with every I_T nexus that lost its3052 * persistent reservation and/or registration, with the3053 * additional sense code set to REGISTRATIONS PREEMPTED;3054 */3055 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,3056 ASCQ_2AH_REGISTRATIONS_PREEMPTED);3057 }3058 spin_unlock(&pr_tmpl->registration_lock);3059 /*3060 * c) Establish a persistent reservation for the preempting3061 * I_T nexus using the contents of the SCOPE and TYPE fields;3062 */3063 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,3064 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,3065 type, scope, preempt_type);3066 /*3067 * d) Process tasks as defined in 5.7.1;3068 * e) See above..3069 * f) If the type or scope has changed, then for every I_T nexus3070 * whose reservation key was not removed, except for the I_T3071 * nexus on which the PERSISTENT RESERVE OUT command was3072 * received, the device server shall establish a unit3073 * attention condition for the initiator port associated with3074 * that I_T nexus, with the additional sense code set to3075 * RESERVATIONS RELEASED. If the type or scope have not3076 * changed, then no unit attention condition(s) shall be3077 * established for this reason.3078 */3079 if ((prh_type != type) || (prh_scope != scope)) {3080 spin_lock(&pr_tmpl->registration_lock);3081 list_for_each_entry_safe(pr_reg, pr_reg_tmp,3082 &pr_tmpl->registration_list, pr_reg_list) {3083 3084 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;3085 if (calling_it_nexus)3086 continue;3087 3088 target_ua_allocate_lun(pr_reg->pr_reg_nacl,3089 pr_reg->pr_res_mapped_lun, 0x2A,3090 ASCQ_2AH_RESERVATIONS_RELEASED);3091 }3092 spin_unlock(&pr_tmpl->registration_lock);3093 }3094 spin_unlock(&dev->dev_reservation_lock);3095 /*3096 * Call LUN_RESET logic upon list of struct t10_pr_registration,3097 * All received CDBs for the matching existing reservation and3098 * registrations undergo ABORT_TASK logic.3099 *3100 * From there, core_scsi3_release_preempt_and_abort() will3101 * release every registration in the list (which have already3102 * been removed from the primary pr_reg list), except the3103 * new persistent reservation holder, the calling Initiator Port.3104 */3105 if (preempt_type == PREEMPT_AND_ABORT) {3106 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);3107 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,3108 pr_reg_n);3109 }3110 3111 if (pr_tmpl->pr_aptpl_active)3112 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);3113 3114 core_scsi3_put_pr_reg(pr_reg_n);3115 core_scsi3_pr_generation(cmd->se_dev);3116 return 0;3117}3118 3119static sense_reason_t3120core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,3121 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)3122{3123 switch (type) {3124 case PR_TYPE_WRITE_EXCLUSIVE:3125 case PR_TYPE_EXCLUSIVE_ACCESS:3126 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:3127 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:3128 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:3129 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:3130 return core_scsi3_pro_preempt(cmd, type, scope, res_key,3131 sa_res_key, preempt_type);3132 default:3133 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"3134 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);3135 return TCM_INVALID_CDB_FIELD;3136 }3137}3138 3139 3140static sense_reason_t3141core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,3142 u64 sa_res_key, int aptpl, int unreg)3143{3144 struct se_session *se_sess = cmd->se_sess;3145 struct se_device *dev = cmd->se_dev;3146 struct se_dev_entry *dest_se_deve = NULL;3147 struct se_lun *se_lun = cmd->se_lun, *tmp_lun;3148 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;3149 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;3150 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;3151 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;3152 struct t10_reservation *pr_tmpl = &dev->t10_pr;3153 unsigned char *buf;3154 const unsigned char *initiator_str;3155 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };3156 u32 tid_len, tmp_tid_len;3157 int new_reg = 0, type, scope, matching_iname;3158 sense_reason_t ret;3159 unsigned short rtpi;3160 unsigned char proto_ident;3161 3162 if (!se_sess || !se_lun) {3163 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");3164 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3165 }3166 3167 se_tpg = se_sess->se_tpg;3168 tf_ops = se_tpg->se_tpg_tfo;3169 /*3170 * Follow logic from spc4r17 Section 5.7.8, Table 50 --3171 * Register behaviors for a REGISTER AND MOVE service action3172 *3173 * Locate the existing *pr_reg via struct se_node_acl pointers3174 */3175 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,3176 se_sess);3177 if (!pr_reg) {3178 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"3179 " *pr_reg for REGISTER_AND_MOVE\n");3180 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3181 }3182 /*3183 * The provided reservation key much match the existing reservation key3184 * provided during this initiator's I_T nexus registration.3185 */3186 if (res_key != pr_reg->pr_res_key) {3187 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"3188 " res_key: 0x%016Lx does not match existing SA REGISTER"3189 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);3190 ret = TCM_RESERVATION_CONFLICT;3191 goto out_put_pr_reg;3192 }3193 /*3194 * The service active reservation key needs to be non zero3195 */3196 if (!sa_res_key) {3197 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"3198 " sa_res_key\n");3199 ret = TCM_INVALID_PARAMETER_LIST;3200 goto out_put_pr_reg;3201 }3202 3203 /*3204 * Determine the Relative Target Port Identifier where the reservation3205 * will be moved to for the TransportID containing SCSI initiator WWN3206 * information.3207 */3208 buf = transport_kmap_data_sg(cmd);3209 if (!buf) {3210 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;3211 goto out_put_pr_reg;3212 }3213 3214 rtpi = get_unaligned_be16(&buf[18]);3215 tid_len = get_unaligned_be32(&buf[20]);3216 transport_kunmap_data_sg(cmd);3217 buf = NULL;3218 3219 if ((tid_len + 24) != cmd->data_length) {3220 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"3221 " does not equal CDB data_length: %u\n", tid_len,3222 cmd->data_length);3223 ret = TCM_INVALID_PARAMETER_LIST;3224 goto out_put_pr_reg;3225 }3226 3227 spin_lock(&dev->se_port_lock);3228 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {3229 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi)3230 continue;3231 dest_se_tpg = tmp_lun->lun_tpg;3232 dest_tf_ops = dest_se_tpg->se_tpg_tfo;3233 if (!dest_tf_ops)3234 continue;3235 3236 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);3237 spin_unlock(&dev->se_port_lock);3238 3239 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {3240 pr_err("core_scsi3_tpg_depend_item() failed"3241 " for dest_se_tpg\n");3242 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);3243 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3244 goto out_put_pr_reg;3245 }3246 3247 spin_lock(&dev->se_port_lock);3248 break;3249 }3250 spin_unlock(&dev->se_port_lock);3251 3252 if (!dest_se_tpg || !dest_tf_ops) {3253 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"3254 " fabric ops from Relative Target Port Identifier:"3255 " %hu\n", rtpi);3256 ret = TCM_INVALID_PARAMETER_LIST;3257 goto out_put_pr_reg;3258 }3259 3260 buf = transport_kmap_data_sg(cmd);3261 if (!buf) {3262 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;3263 goto out_put_pr_reg;3264 }3265 proto_ident = (buf[24] & 0x0f);3266 3267 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"3268 " 0x%02x\n", proto_ident);3269 3270 if (proto_ident != dest_se_tpg->proto_id) {3271 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"3272 " proto_ident: 0x%02x does not match ident: 0x%02x"3273 " from fabric: %s\n", proto_ident,3274 dest_se_tpg->proto_id,3275 dest_tf_ops->fabric_name);3276 ret = TCM_INVALID_PARAMETER_LIST;3277 goto out;3278 }3279 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,3280 &buf[24], &tmp_tid_len, &iport_ptr);3281 if (!initiator_str) {3282 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"3283 " initiator_str from Transport ID\n");3284 ret = TCM_INVALID_PARAMETER_LIST;3285 goto out;3286 }3287 3288 transport_kunmap_data_sg(cmd);3289 buf = NULL;3290 3291 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"3292 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?3293 "port" : "device", initiator_str, (iport_ptr != NULL) ?3294 iport_ptr : "");3295 /*3296 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service3297 * action specifies a TransportID that is the same as the initiator port3298 * of the I_T nexus for the command received, then the command shall3299 * be terminated with CHECK CONDITION status, with the sense key set to3300 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD3301 * IN PARAMETER LIST.3302 */3303 pr_reg_nacl = pr_reg->pr_reg_nacl;3304 matching_iname = (!strcmp(initiator_str,3305 pr_reg_nacl->initiatorname)) ? 1 : 0;3306 if (!matching_iname)3307 goto after_iport_check;3308 3309 if (!iport_ptr || !pr_reg->isid_present_at_reg) {3310 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"3311 " matches: %s on received I_T Nexus\n", initiator_str,3312 pr_reg_nacl->initiatorname);3313 ret = TCM_INVALID_PARAMETER_LIST;3314 goto out;3315 }3316 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {3317 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"3318 " matches: %s %s on received I_T Nexus\n",3319 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,3320 pr_reg->pr_reg_isid);3321 ret = TCM_INVALID_PARAMETER_LIST;3322 goto out;3323 }3324after_iport_check:3325 /*3326 * Locate the destination struct se_node_acl from the received Transport ID3327 */3328 mutex_lock(&dest_se_tpg->acl_node_mutex);3329 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,3330 initiator_str);3331 if (dest_node_acl)3332 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);3333 mutex_unlock(&dest_se_tpg->acl_node_mutex);3334 3335 if (!dest_node_acl) {3336 pr_err("Unable to locate %s dest_node_acl for"3337 " TransportID%s\n", dest_tf_ops->fabric_name,3338 initiator_str);3339 ret = TCM_INVALID_PARAMETER_LIST;3340 goto out;3341 }3342 3343 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {3344 pr_err("core_scsi3_nodeacl_depend_item() for"3345 " dest_node_acl\n");3346 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);3347 dest_node_acl = NULL;3348 ret = TCM_INVALID_PARAMETER_LIST;3349 goto out;3350 }3351 3352 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"3353 " %s from TransportID\n", dest_tf_ops->fabric_name,3354 dest_node_acl->initiatorname);3355 3356 /*3357 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET3358 * PORT IDENTIFIER.3359 */3360 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);3361 if (!dest_se_deve) {3362 pr_err("Unable to locate %s dest_se_deve from RTPI:"3363 " %hu\n", dest_tf_ops->fabric_name, rtpi);3364 ret = TCM_INVALID_PARAMETER_LIST;3365 goto out;3366 }3367 3368 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {3369 pr_err("core_scsi3_lunacl_depend_item() failed\n");3370 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);3371 dest_se_deve = NULL;3372 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3373 goto out;3374 }3375 3376 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"3377 " ACL for dest_se_deve->mapped_lun: %llu\n",3378 dest_tf_ops->fabric_name, dest_node_acl->initiatorname,3379 dest_se_deve->mapped_lun);3380 3381 /*3382 * A persistent reservation needs to already existing in order to3383 * successfully complete the REGISTER_AND_MOVE service action..3384 */3385 spin_lock(&dev->dev_reservation_lock);3386 pr_res_holder = dev->dev_pr_res_holder;3387 if (!pr_res_holder) {3388 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"3389 " currently held\n");3390 spin_unlock(&dev->dev_reservation_lock);3391 ret = TCM_INVALID_CDB_FIELD;3392 goto out;3393 }3394 /*3395 * The received on I_T Nexus must be the reservation holder.3396 *3397 * From spc4r17 section 5.7.8 Table 50 --3398 * Register behaviors for a REGISTER AND MOVE service action3399 */3400 if (!is_reservation_holder(pr_res_holder, pr_reg)) {3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"3402 " Nexus is not reservation holder\n");3403 spin_unlock(&dev->dev_reservation_lock);3404 ret = TCM_RESERVATION_CONFLICT;3405 goto out;3406 }3407 /*3408 * From spc4r17 section 5.7.8: registering and moving reservation3409 *3410 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service3411 * action is received and the established persistent reservation is a3412 * Write Exclusive - All Registrants type or Exclusive Access -3413 * All Registrants type reservation, then the command shall be completed3414 * with RESERVATION CONFLICT status.3415 */3416 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||3417 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {3418 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"3419 " reservation for type: %s\n",3420 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));3421 spin_unlock(&dev->dev_reservation_lock);3422 ret = TCM_RESERVATION_CONFLICT;3423 goto out;3424 }3425 pr_res_nacl = pr_res_holder->pr_reg_nacl;3426 /*3427 * b) Ignore the contents of the (received) SCOPE and TYPE fields;3428 */3429 type = pr_res_holder->pr_res_type;3430 scope = pr_res_holder->pr_res_type;3431 /*3432 * c) Associate the reservation key specified in the SERVICE ACTION3433 * RESERVATION KEY field with the I_T nexus specified as the3434 * destination of the register and move, where:3435 * A) The I_T nexus is specified by the TransportID and the3436 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and3437 * B) Regardless of the TransportID format used, the association for3438 * the initiator port is based on either the initiator port name3439 * (see 3.1.71) on SCSI transport protocols where port names are3440 * required or the initiator port identifier (see 3.1.70) on SCSI3441 * transport protocols where port names are not required;3442 * d) Register the reservation key specified in the SERVICE ACTION3443 * RESERVATION KEY field;3444 *3445 * Also, It is not an error for a REGISTER AND MOVE service action to3446 * register an I_T nexus that is already registered with the same3447 * reservation key or a different reservation key.3448 */3449 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,3450 iport_ptr);3451 if (!dest_pr_reg) {3452 struct se_lun *dest_lun = dest_se_deve->se_lun;3453 3454 spin_unlock(&dev->dev_reservation_lock);3455 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,3456 dest_lun, dest_se_deve, dest_se_deve->mapped_lun,3457 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {3458 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;3459 goto out;3460 }3461 spin_lock(&dev->dev_reservation_lock);3462 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,3463 iport_ptr);3464 new_reg = 1;3465 } else {3466 /*3467 * e) Retain the reservation key specified in the SERVICE ACTION3468 * RESERVATION KEY field and associated information;3469 */3470 dest_pr_reg->pr_res_key = sa_res_key;3471 }3472 /*3473 * f) Release the persistent reservation for the persistent reservation3474 * holder (i.e., the I_T nexus on which the3475 */3476 __core_scsi3_complete_pro_release(dev, pr_res_nacl,3477 dev->dev_pr_res_holder, 0, 0);3478 /*3479 * g) Move the persistent reservation to the specified I_T nexus using3480 * the same scope and type as the persistent reservation released in3481 * item f); and3482 */3483 dev->dev_pr_res_holder = dest_pr_reg;3484 dest_pr_reg->pr_res_holder = 1;3485 dest_pr_reg->pr_res_type = type;3486 pr_reg->pr_res_scope = scope;3487 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);3488 /*3489 * Increment PRGeneration for existing registrations..3490 */3491 if (!new_reg)3492 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;3493 spin_unlock(&dev->dev_reservation_lock);3494 3495 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"3496 " created new reservation holder TYPE: %s on object RTPI:"3497 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,3498 core_scsi3_pr_dump_type(type), rtpi,3499 dest_pr_reg->pr_res_generation);3500 pr_debug("SPC-3 PR Successfully moved reservation from"3501 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",3502 tf_ops->fabric_name, pr_reg_nacl->initiatorname,3503 i_buf, dest_tf_ops->fabric_name,3504 dest_node_acl->initiatorname, (iport_ptr != NULL) ?3505 iport_ptr : "");3506 /*3507 * It is now safe to release configfs group dependencies for destination3508 * of Transport ID Initiator Device/Port Identifier3509 */3510 core_scsi3_lunacl_undepend_item(dest_se_deve);3511 core_scsi3_nodeacl_undepend_item(dest_node_acl);3512 core_scsi3_tpg_undepend_item(dest_se_tpg);3513 /*3514 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T3515 * nexus on which PERSISTENT RESERVE OUT command was received.3516 */3517 if (unreg) {3518 spin_lock(&pr_tmpl->registration_lock);3519 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);3520 spin_unlock(&pr_tmpl->registration_lock);3521 } else3522 core_scsi3_put_pr_reg(pr_reg);3523 3524 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);3525 3526 core_scsi3_put_pr_reg(dest_pr_reg);3527 return 0;3528out:3529 if (buf)3530 transport_kunmap_data_sg(cmd);3531 if (dest_se_deve)3532 core_scsi3_lunacl_undepend_item(dest_se_deve);3533 if (dest_node_acl)3534 core_scsi3_nodeacl_undepend_item(dest_node_acl);3535 core_scsi3_tpg_undepend_item(dest_se_tpg);3536 3537out_put_pr_reg:3538 core_scsi3_put_pr_reg(pr_reg);3539 return ret;3540}3541 3542static sense_reason_t3543target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key,3544 u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt)3545{3546 struct exec_cmd_ops *ops = cmd->protocol_data;3547 3548 if (!cmd->se_sess || !cmd->se_lun) {3549 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");3550 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3551 }3552 3553 if (!ops->execute_pr_out) {3554 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");3555 return TCM_UNSUPPORTED_SCSI_OPCODE;3556 }3557 3558 switch (sa) {3559 case PRO_REGISTER_AND_MOVE:3560 case PRO_REPLACE_LOST_RESERVATION:3561 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n");3562 return TCM_UNSUPPORTED_SCSI_OPCODE;3563 }3564 3565 if (spec_i_pt || all_tg_pt) {3566 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n");3567 return TCM_UNSUPPORTED_SCSI_OPCODE;3568 }3569 3570 return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl);3571}3572 3573/*3574 * See spc4r17 section 6.14 Table 1703575 */3576sense_reason_t3577target_scsi3_emulate_pr_out(struct se_cmd *cmd)3578{3579 struct se_device *dev = cmd->se_dev;3580 unsigned char *cdb = &cmd->t_task_cdb[0];3581 unsigned char *buf;3582 u64 res_key, sa_res_key;3583 int sa, scope, type, aptpl;3584 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;3585 sense_reason_t ret;3586 3587 /*3588 * Following spc2r20 5.5.1 Reservations overview:3589 *3590 * If a logical unit has been reserved by any RESERVE command and is3591 * still reserved by any initiator, all PERSISTENT RESERVE IN and all3592 * PERSISTENT RESERVE OUT commands shall conflict regardless of3593 * initiator or service action and shall terminate with a RESERVATION3594 * CONFLICT status.3595 */3596 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {3597 pr_err("Received PERSISTENT_RESERVE CDB while legacy"3598 " SPC-2 reservation is held, returning"3599 " RESERVATION_CONFLICT\n");3600 return TCM_RESERVATION_CONFLICT;3601 }3602 3603 /*3604 * FIXME: A NULL struct se_session pointer means an this is not coming from3605 * a $FABRIC_MOD's nexus, but from internal passthrough ops.3606 */3607 if (!cmd->se_sess)3608 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3609 3610 if (cmd->data_length < 24) {3611 pr_warn("SPC-PR: Received PR OUT parameter list"3612 " length too small: %u\n", cmd->data_length);3613 return TCM_PARAMETER_LIST_LENGTH_ERROR;3614 }3615 3616 /*3617 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)3618 */3619 sa = (cdb[1] & 0x1f);3620 scope = (cdb[2] & 0xf0);3621 type = (cdb[2] & 0x0f);3622 3623 buf = transport_kmap_data_sg(cmd);3624 if (!buf)3625 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3626 3627 /*3628 * From PERSISTENT_RESERVE_OUT parameter list (payload)3629 */3630 res_key = get_unaligned_be64(&buf[0]);3631 sa_res_key = get_unaligned_be64(&buf[8]);3632 /*3633 * REGISTER_AND_MOVE uses a different SA parameter list containing3634 * SCSI TransportIDs.3635 */3636 if (sa != PRO_REGISTER_AND_MOVE) {3637 spec_i_pt = (buf[20] & 0x08);3638 all_tg_pt = (buf[20] & 0x04);3639 aptpl = (buf[20] & 0x01);3640 } else {3641 aptpl = (buf[17] & 0x01);3642 unreg = (buf[17] & 0x02);3643 }3644 /*3645 * If the backend device has been configured to force APTPL metadata3646 * write-out, go ahead and propigate aptpl=1 down now.3647 */3648 if (dev->dev_attrib.force_pr_aptpl)3649 aptpl = 1;3650 3651 transport_kunmap_data_sg(cmd);3652 buf = NULL;3653 3654 /*3655 * SPEC_I_PT=1 is only valid for Service action: REGISTER3656 */3657 if (spec_i_pt && (sa != PRO_REGISTER))3658 return TCM_INVALID_PARAMETER_LIST;3659 3660 /*3661 * From spc4r17 section 6.14:3662 *3663 * If the SPEC_I_PT bit is set to zero, the service action is not3664 * REGISTER AND MOVE, and the parameter list length is not 24, then3665 * the command shall be terminated with CHECK CONDITION status, with3666 * the sense key set to ILLEGAL REQUEST, and the additional sense3667 * code set to PARAMETER LIST LENGTH ERROR.3668 */3669 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&3670 (cmd->data_length != 24)) {3671 pr_warn("SPC-PR: Received PR OUT illegal parameter"3672 " list length: %u\n", cmd->data_length);3673 return TCM_PARAMETER_LIST_LENGTH_ERROR;3674 }3675 3676 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {3677 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type,3678 aptpl, all_tg_pt, spec_i_pt);3679 goto done;3680 }3681 3682 /*3683 * (core_scsi3_emulate_pro_* function parameters3684 * are defined by spc4r17 Table 174:3685 * PERSISTENT_RESERVE_OUT service actions and valid parameters.3686 */3687 switch (sa) {3688 case PRO_REGISTER:3689 ret = core_scsi3_emulate_pro_register(cmd,3690 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);3691 break;3692 case PRO_RESERVE:3693 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);3694 break;3695 case PRO_RELEASE:3696 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);3697 break;3698 case PRO_CLEAR:3699 ret = core_scsi3_emulate_pro_clear(cmd, res_key);3700 break;3701 case PRO_PREEMPT:3702 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,3703 res_key, sa_res_key, PREEMPT);3704 break;3705 case PRO_PREEMPT_AND_ABORT:3706 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,3707 res_key, sa_res_key, PREEMPT_AND_ABORT);3708 break;3709 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:3710 ret = core_scsi3_emulate_pro_register(cmd,3711 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);3712 break;3713 case PRO_REGISTER_AND_MOVE:3714 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,3715 sa_res_key, aptpl, unreg);3716 break;3717 default:3718 pr_err("Unknown PERSISTENT_RESERVE_OUT service"3719 " action: 0x%02x\n", sa);3720 return TCM_INVALID_CDB_FIELD;3721 }3722 3723done:3724 if (!ret)3725 target_complete_cmd(cmd, SAM_STAT_GOOD);3726 return ret;3727}3728 3729/*3730 * PERSISTENT_RESERVE_IN Service Action READ_KEYS3731 *3732 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 1603733 */3734static sense_reason_t3735core_scsi3_pri_read_keys(struct se_cmd *cmd)3736{3737 struct se_device *dev = cmd->se_dev;3738 struct t10_pr_registration *pr_reg;3739 unsigned char *buf;3740 u32 add_len = 0, off = 8;3741 3742 if (cmd->data_length < 8) {3743 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"3744 " too small\n", cmd->data_length);3745 return TCM_INVALID_CDB_FIELD;3746 }3747 3748 buf = transport_kmap_data_sg(cmd);3749 if (!buf)3750 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3751 3752 put_unaligned_be32(dev->t10_pr.pr_generation, buf);3753 3754 spin_lock(&dev->t10_pr.registration_lock);3755 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,3756 pr_reg_list) {3757 /*3758 * Check for overflow of 8byte PRI READ_KEYS payload and3759 * next reservation key list descriptor.3760 */3761 if (off + 8 <= cmd->data_length) {3762 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);3763 off += 8;3764 }3765 /*3766 * SPC5r17: 6.16.2 READ KEYS service action3767 * The ADDITIONAL LENGTH field indicates the number of bytes in3768 * the Reservation key list. The contents of the ADDITIONAL3769 * LENGTH field are not altered based on the allocation length3770 */3771 add_len += 8;3772 }3773 spin_unlock(&dev->t10_pr.registration_lock);3774 3775 put_unaligned_be32(add_len, &buf[4]);3776 target_set_cmd_data_length(cmd, 8 + add_len);3777 3778 transport_kunmap_data_sg(cmd);3779 3780 return 0;3781}3782 3783/*3784 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION3785 *3786 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 1623787 */3788static sense_reason_t3789core_scsi3_pri_read_reservation(struct se_cmd *cmd)3790{3791 struct se_device *dev = cmd->se_dev;3792 struct t10_pr_registration *pr_reg;3793 unsigned char *buf;3794 u64 pr_res_key;3795 u32 add_len = 0;3796 3797 if (cmd->data_length < 8) {3798 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"3799 " too small\n", cmd->data_length);3800 return TCM_INVALID_CDB_FIELD;3801 }3802 3803 buf = transport_kmap_data_sg(cmd);3804 if (!buf)3805 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3806 3807 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);3808 3809 spin_lock(&dev->dev_reservation_lock);3810 pr_reg = dev->dev_pr_res_holder;3811 if (pr_reg) {3812 /*3813 * Set the Additional Length to 16 when a reservation is held3814 */3815 add_len = 16;3816 put_unaligned_be32(add_len, &buf[4]);3817 3818 if (cmd->data_length < 22)3819 goto err;3820 3821 /*3822 * Set the Reservation key.3823 *3824 * From spc4r17, section 5.7.10:3825 * A persistent reservation holder has its reservation key3826 * returned in the parameter data from a PERSISTENT3827 * RESERVE IN command with READ RESERVATION service action as3828 * follows:3829 * a) For a persistent reservation of the type Write Exclusive3830 * - All Registrants or Exclusive Access All Regitrants,3831 * the reservation key shall be set to zero; or3832 * b) For all other persistent reservation types, the3833 * reservation key shall be set to the registered3834 * reservation key for the I_T nexus that holds the3835 * persistent reservation.3836 */3837 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||3838 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))3839 pr_res_key = 0;3840 else3841 pr_res_key = pr_reg->pr_res_key;3842 3843 put_unaligned_be64(pr_res_key, &buf[8]);3844 /*3845 * Set the SCOPE and TYPE3846 */3847 buf[21] = (pr_reg->pr_res_scope & 0xf0) |3848 (pr_reg->pr_res_type & 0x0f);3849 }3850 3851 target_set_cmd_data_length(cmd, 8 + add_len);3852 3853err:3854 spin_unlock(&dev->dev_reservation_lock);3855 transport_kunmap_data_sg(cmd);3856 3857 return 0;3858}3859 3860/*3861 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES3862 *3863 * See spc4r17 section 6.13.4 Table 1653864 */3865static sense_reason_t3866core_scsi3_pri_report_capabilities(struct se_cmd *cmd)3867{3868 struct se_device *dev = cmd->se_dev;3869 struct t10_reservation *pr_tmpl = &dev->t10_pr;3870 unsigned char *buf;3871 u16 len = 8; /* Hardcoded to 8. */3872 3873 if (cmd->data_length < 6) {3874 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"3875 " %u too small\n", cmd->data_length);3876 return TCM_INVALID_CDB_FIELD;3877 }3878 3879 buf = transport_kmap_data_sg(cmd);3880 if (!buf)3881 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3882 3883 put_unaligned_be16(len, &buf[0]);3884 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */3885 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */3886 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */3887 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */3888 /*3889 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so3890 * set the TMV: Task Mask Valid bit.3891 */3892 buf[3] |= 0x80;3893 /*3894 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 1663895 */3896 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */3897 /*3898 * PTPL_A: Persistence across Target Power Loss Active bit3899 */3900 if (pr_tmpl->pr_aptpl_active)3901 buf[3] |= 0x01;3902 /*3903 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 1673904 */3905 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */3906 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */3907 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */3908 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */3909 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */3910 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */3911 3912 target_set_cmd_data_length(cmd, len);3913 3914 transport_kunmap_data_sg(cmd);3915 3916 return 0;3917}3918 3919/*3920 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS3921 *3922 * See spc4r17 section 6.13.5 Table 168 and 1693923 */3924static sense_reason_t3925core_scsi3_pri_read_full_status(struct se_cmd *cmd)3926{3927 struct se_device *dev = cmd->se_dev;3928 struct se_node_acl *se_nacl;3929 struct se_portal_group *se_tpg;3930 struct t10_pr_registration *pr_reg, *pr_reg_tmp;3931 struct t10_reservation *pr_tmpl = &dev->t10_pr;3932 unsigned char *buf;3933 u32 add_desc_len = 0, add_len = 0;3934 u32 off = 8; /* off into first Full Status descriptor */3935 int format_code = 0, pr_res_type = 0, pr_res_scope = 0;3936 int exp_desc_len, desc_len;3937 bool all_reg = false;3938 3939 if (cmd->data_length < 8) {3940 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"3941 " too small\n", cmd->data_length);3942 return TCM_INVALID_CDB_FIELD;3943 }3944 3945 buf = transport_kmap_data_sg(cmd);3946 if (!buf)3947 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;3948 3949 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);3950 3951 spin_lock(&dev->dev_reservation_lock);3952 if (dev->dev_pr_res_holder) {3953 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;3954 3955 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||3956 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {3957 all_reg = true;3958 pr_res_type = pr_holder->pr_res_type;3959 pr_res_scope = pr_holder->pr_res_scope;3960 }3961 }3962 spin_unlock(&dev->dev_reservation_lock);3963 3964 spin_lock(&pr_tmpl->registration_lock);3965 list_for_each_entry_safe(pr_reg, pr_reg_tmp,3966 &pr_tmpl->registration_list, pr_reg_list) {3967 3968 se_nacl = pr_reg->pr_reg_nacl;3969 se_tpg = pr_reg->pr_reg_nacl->se_tpg;3970 add_desc_len = 0;3971 3972 atomic_inc_mb(&pr_reg->pr_res_holders);3973 spin_unlock(&pr_tmpl->registration_lock);3974 /*3975 * Determine expected length of $FABRIC_MOD specific3976 * TransportID full status descriptor..3977 */3978 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,3979 &format_code);3980 if (exp_desc_len < 0 ||3981 exp_desc_len + add_len > cmd->data_length) {3982 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"3983 " out of buffer: %d\n", cmd->data_length);3984 spin_lock(&pr_tmpl->registration_lock);3985 atomic_dec_mb(&pr_reg->pr_res_holders);3986 break;3987 }3988 /*3989 * Set RESERVATION KEY3990 */3991 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);3992 off += 8;3993 off += 4; /* Skip Over Reserved area */3994 3995 /*3996 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.3997 */3998 if (pr_reg->pr_reg_all_tg_pt)3999 buf[off] = 0x02;4000 /*4001 * The struct se_lun pointer will be present for the4002 * reservation holder for PR_HOLDER bit.4003 *4004 * Also, if this registration is the reservation4005 * holder or there is an All Registrants reservation4006 * active, fill in SCOPE and TYPE in the next byte.4007 */4008 if (pr_reg->pr_res_holder) {4009 buf[off++] |= 0x01;4010 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |4011 (pr_reg->pr_res_type & 0x0f);4012 } else if (all_reg) {4013 buf[off++] |= 0x01;4014 buf[off++] = (pr_res_scope & 0xf0) |4015 (pr_res_type & 0x0f);4016 } else {4017 off += 2;4018 }4019 4020 off += 4; /* Skip over reserved area */4021 /*4022 * From spc4r17 6.3.15:4023 *4024 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT4025 * IDENTIFIER field contains the relative port identifier (see4026 * 3.1.120) of the target port that is part of the I_T nexus4027 * described by this full status descriptor. If the ALL_TG_PT4028 * bit is set to one, the contents of the RELATIVE TARGET PORT4029 * IDENTIFIER field are not defined by this standard.4030 */4031 if (!pr_reg->pr_reg_all_tg_pt) {4032 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;4033 4034 put_unaligned_be16(sep_rtpi, &buf[off]);4035 off += 2;4036 } else4037 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */4038 4039 buf[off+4] = se_tpg->proto_id;4040 4041 /*4042 * Now, have the $FABRIC_MOD fill in the transport ID.4043 */4044 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,4045 &format_code, &buf[off+4]);4046 4047 spin_lock(&pr_tmpl->registration_lock);4048 atomic_dec_mb(&pr_reg->pr_res_holders);4049 4050 if (desc_len < 0)4051 break;4052 /*4053 * Set the ADDITIONAL DESCRIPTOR LENGTH4054 */4055 put_unaligned_be32(desc_len, &buf[off]);4056 off += 4;4057 /*4058 * Size of full desctipor header minus TransportID4059 * containing $FABRIC_MOD specific) initiator device/port4060 * WWN information.4061 *4062 * See spc4r17 Section 6.13.5 Table 1694063 */4064 add_desc_len = (24 + desc_len);4065 4066 off += desc_len;4067 add_len += add_desc_len;4068 }4069 spin_unlock(&pr_tmpl->registration_lock);4070 /*4071 * Set ADDITIONAL_LENGTH4072 */4073 put_unaligned_be32(add_len, &buf[4]);4074 target_set_cmd_data_length(cmd, 8 + add_len);4075 4076 transport_kunmap_data_sg(cmd);4077 4078 return 0;4079}4080 4081static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa)4082{4083 struct exec_cmd_ops *ops = cmd->protocol_data;4084 unsigned char *buf;4085 sense_reason_t ret;4086 4087 if (cmd->data_length < 8) {4088 pr_err("PRIN SA SCSI Data Length: %u too small\n",4089 cmd->data_length);4090 return TCM_INVALID_CDB_FIELD;4091 }4092 4093 if (!ops->execute_pr_in) {4094 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");4095 return TCM_UNSUPPORTED_SCSI_OPCODE;4096 }4097 4098 if (sa == PRI_READ_FULL_STATUS) {4099 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n");4100 return TCM_UNSUPPORTED_SCSI_OPCODE;4101 }4102 4103 buf = transport_kmap_data_sg(cmd);4104 if (!buf)4105 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;4106 4107 ret = ops->execute_pr_in(cmd, sa, buf);4108 4109 transport_kunmap_data_sg(cmd);4110 return ret;4111}4112 4113sense_reason_t4114target_scsi3_emulate_pr_in(struct se_cmd *cmd)4115{4116 u8 sa = cmd->t_task_cdb[1] & 0x1f;4117 sense_reason_t ret;4118 4119 /*4120 * Following spc2r20 5.5.1 Reservations overview:4121 *4122 * If a logical unit has been reserved by any RESERVE command and is4123 * still reserved by any initiator, all PERSISTENT RESERVE IN and all4124 * PERSISTENT RESERVE OUT commands shall conflict regardless of4125 * initiator or service action and shall terminate with a RESERVATION4126 * CONFLICT status.4127 */4128 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {4129 pr_err("Received PERSISTENT_RESERVE CDB while legacy"4130 " SPC-2 reservation is held, returning"4131 " RESERVATION_CONFLICT\n");4132 return TCM_RESERVATION_CONFLICT;4133 }4134 4135 if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {4136 ret = target_try_pr_in_pt(cmd, sa);4137 goto done;4138 }4139 4140 switch (sa) {4141 case PRI_READ_KEYS:4142 ret = core_scsi3_pri_read_keys(cmd);4143 break;4144 case PRI_READ_RESERVATION:4145 ret = core_scsi3_pri_read_reservation(cmd);4146 break;4147 case PRI_REPORT_CAPABILITIES:4148 ret = core_scsi3_pri_report_capabilities(cmd);4149 break;4150 case PRI_READ_FULL_STATUS:4151 ret = core_scsi3_pri_read_full_status(cmd);4152 break;4153 default:4154 pr_err("Unknown PERSISTENT_RESERVE_IN service"4155 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);4156 return TCM_INVALID_CDB_FIELD;4157 }4158 4159done:4160 if (!ret)4161 target_complete_cmd(cmd, SAM_STAT_GOOD);4162 return ret;4163}4164 4165sense_reason_t4166target_check_reservation(struct se_cmd *cmd)4167{4168 struct se_device *dev = cmd->se_dev;4169 sense_reason_t ret;4170 4171 if (!cmd->se_sess)4172 return 0;4173 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)4174 return 0;4175 if (!dev->dev_attrib.emulate_pr)4176 return 0;4177 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)4178 return 0;4179 4180 spin_lock(&dev->dev_reservation_lock);4181 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)4182 ret = target_scsi2_reservation_check(cmd);4183 else4184 ret = target_scsi3_pr_reservation_check(cmd);4185 spin_unlock(&dev->dev_reservation_lock);4186 4187 return ret;4188}4189