drivers/target/target_core_pr.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_pr.c
   4  *
   5  * This file contains SPC-3 compliant persistent reservations and
   6  * 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  */
  35 struct 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
  43 void 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
  56 enum register_type {
  57         REGISTER,
  58         REGISTER_AND_IGNORE_EXISTING_KEY,
  59         REGISTER_AND_MOVE,
  60 };
  61
  62 enum preempt_type {
  63         PREEMPT,
  64         PREEMPT_AND_ABORT,
  65 };
  66
  67 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  68                                               struct t10_pr_registration *, int, int);
  69
  70 static 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
  86 static sense_reason_t
  87 target_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_6:
  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
 115 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 116                                         struct se_node_acl *, struct se_session *);
 117 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 118
 119 static 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 RELEASE
 132                  * behavior
 133                  *
 134                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 135                  * status, but no reservation shall be established and the
 136                  * persistent reservation shall not be changed, if the command
 137                  * is received from a) and b) below.
 138                  *
 139                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 140                  * 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; or
 144                  * b) An I_T nexus that is registered if a registrants only or
 145                  *    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 processed
 149                  * 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 OUT
 169                  * command with the REGISTER or the REGISTER AND IGNORE
 170                  * EXISTING KEY service action and is still registered by any
 171                  * initiator, all RESERVE commands and all RELEASE commands
 172                  * regardless of initiator shall conflict and shall terminate
 173                  * 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
 190 void 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
 200 sense_reason_t
 201 target_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
 234 out_unlock:
 235         spin_unlock(&dev->dev_reservation_lock);
 236 out:
 237         target_complete_cmd(cmd, SAM_STAT_GOOD);
 238         return 0;
 239 }
 240
 241 sense_reason_t
 242 target_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_cmd
 257          * ops
 258          */
 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
 296 out_unlock:
 297         spin_unlock(&dev->dev_reservation_lock);
 298 out:
 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 support
 307  *
 308  * This function is called by those initiator ports who are *NOT*
 309  * the active PR reservation holder when a reservation is present.
 310  */
 311 static 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 return
 322                          * 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 reservation
 344                  * 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 access
 370          */
 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 that
 395                  * are allowed in the presence of various reservations.
 396                  * See spc4r17, table 46
 397                  */
 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_6:
 422         case RELEASE_10:
 423                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 424                 ret = 0;
 425                 break;
 426         case RESERVE_6:
 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 switch
 485          * 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 the
 496          * WRITE_EXCLUSIVE_* reservation.
 497          */
 498         if (we && !registered_nexus) {
 499                 if (cmd->data_direction == DMA_TO_DEVICE) {
 500                         /*
 501                          * Conflict for write exclusive
 502                          */
 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 Exclusive
 512                          * PR TYPEs to pass for registered and
 513                          * non-registered_nexuxes NOT holding the reservation.
 514                          *
 515                          * We only make noise for the unregisterd nexuses,
 516                          * as we expect registered non-reservation holding
 517                          * 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 locks
 545                 * 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
 564 static sense_reason_t
 565 target_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
 590 check_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
 596 static 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 wrapping
 602          * counter mainted by the device server.
 603          *
 604          * Note that this is done regardless of Active Persist across
 605          * Target PowerLoss (APTPL)
 606          *
 607          * See spc4r17 section 6.3.12 READ_KEYS service action
 608          */
 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
 616 static 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 by
 645          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 646          *
 647          * Otherwise, locate se_dev_entry now and obtain a reference until
 648          * 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
 684 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 685 static 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=0
 689  * modes.
 690  */
 691 static 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 the
 711          * 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=0
 720          */
 721         if (!all_tg_pt)
 722                 return pr_reg;
 723         /*
 724          * Create list of matching SCSI Initiator Port registrations
 725          * for ALL_TG_PT=1
 726          */
 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 MappedLUNs
 737                          * that have not been make explicit via a ConfigFS
 738                          * 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 allocated
 747                          * above..
 748                          */
 749                         if (nacl == nacl_tmp)
 750                                 continue;
 751                         /*
 752                          * Only perform PR registrations for target ports on
 753                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 754                          * 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 format
 760                          */
 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 released
 768                          * for the exception path at label out: below, or upon
 769                          * completion of adding ALL_TG_PT=1 registrations in
 770                          * __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 different
 782                          * port, allocate the pr_reg_atp and attach it to the
 783                          * pr_reg->pr_reg_atp_list that will be processed once
 784                          * the original *pr_reg is processed in
 785                          * __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;
 811 out:
 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
 822 int 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 this
 865          * 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 reservation
 880          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 881          * the Initiator Node LUN ACL from the fabric module is created for
 882          * 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
 892 static 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
 916 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 917                                 struct t10_pr_registration *, enum register_type, int);
 918
 919 static 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_acl
 935          */
 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 those
 942          * created from APTPL metadata.  Note that multiple registrations
 943          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 944          * 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, that
 957                          * 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 will
 976                          * 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 metadata
 988                          * 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
 999 int 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
1014 static 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
1044 static 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 successful
1058          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1059          *
1060          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1061          * 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 lock
1063          * 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=1
1081          * 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_kref
1100                  * 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         }
1111 out:
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
1125 static 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
1151 static 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_acl
1164                  */
1165                 if (pr_reg->pr_reg_nacl != nacl)
1166                         continue;
1167
1168                 /*
1169                  * If this registration does NOT contain a fabric provided
1170                  * 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-value
1179                  * SCSI Initiator Port TransportIDs, then we expect a valid
1180                  * 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
1196 static 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
1214 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1215 {
1216         atomic_dec_mb(&pr_reg->pr_res_holders);
1217 }
1218
1219 static 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 that
1236                  * 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 holder
1241                  *    and the persistent reservation is not an all registrants
1242                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1243                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1244                  *    service action with the SERVICE ACTION RESERVATION KEY
1245                  *    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 existing
1251                  * registrations are still processed as reservation holders
1252                  * in core_scsi3_pr_seq_non_holder() after the initial
1253                  * 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
1270 static 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 this
1301          * *pr_reg have been released.  Because list_del() is called above,
1302          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1303          * 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_list
1338          * 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
1343 void 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
1380 void 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
1412 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1413 {
1414         return target_depend_item(&tpg->tpg_group.cg_item);
1415 }
1416
1417 static 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
1423 static 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
1430 static 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
1437 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1438 {
1439         /*
1440          * For nacl->dynamic_node_acl=1
1441          */
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
1448 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1449 {
1450         /*
1451          * For nacl->dynamic_node_acl=1
1452          */
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
1462 static sense_reason_t
1463 core_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 the
1489          * local_node_acl pointer and add to struct list_head tid_dest_list
1490          * 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 sure
1537          * 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 the
1550          * receiving I_T Nexus portal's fabric dependent methods to
1551          * 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 by
1567                          * the received TransportID
1568                          */
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 that
1580                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1581                          * 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 registered
1605                          * from the decoded fabric module specific TransportID
1606                          * 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 matching
1662                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1663                  * 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 for
1695                  * 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 setup
1711                  * the dest_node_acl and dest_se_deve pointers for the
1712                  * 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 the
1731                  * TransportID referenced SCSI Initiator port.  This
1732                  * done because of the following from spc4r17 in section
1733                  * 6.14.3 wrt SPEC_I_PT:
1734                  *
1735                  * "If a registration fails for any initiator port (e.g., if th
1736                  * logical unit does not have enough resources available to
1737                  * hold the registration information), no registrations shall be
1738                  * made, and the command shall be terminated with
1739                  * CHECK CONDITION status."
1740                  *
1741                  * That means we call __core_scsi3_alloc_registration() here,
1742                  * and then call __core_scsi3_add_registration() in the
1743                  * 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 the
1772          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1773          * and dest_se_deve.
1774          *
1775          * The SA Reservation Key from the PROUT is set for the
1776          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1777          * means that the TransportID Initiator port will be
1778          * registered on all of the target ports in the SCSI target device
1779          * ALL_TG_PT=0 means the registration will only be for the
1780          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1781          * 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;
1812 out_unmap:
1813         transport_kunmap_data_sg(cmd);
1814 out:
1815         /*
1816          * For the failure case, release everything from tid_dest_list
1817          * 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 for
1834                  * 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
1846                 if (dest_se_deve)
1847                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1848
1849                 if (is_local)
1850                         continue;
1851
1852                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1853                 core_scsi3_tpg_undepend_item(dest_tpg);
1854         }
1855         return ret;
1856 }
1857
1858 static int core_scsi3_update_aptpl_buf(
1859         struct se_device *dev,
1860         unsigned char *buf,
1861         u32 pr_aptpl_buf_len)
1862 {
1863         struct se_portal_group *tpg;
1864         struct t10_pr_registration *pr_reg;
1865         unsigned char tmp[512], isid_buf[32];
1866         ssize_t len = 0;
1867         int reg_count = 0;
1868         int ret = 0;
1869
1870         spin_lock(&dev->dev_reservation_lock);
1871         spin_lock(&dev->t10_pr.registration_lock);
1872         /*
1873          * Walk the registration list..
1874          */
1875         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1876                         pr_reg_list) {
1877
1878                 tmp[0] = '\0';
1879                 isid_buf[0] = '\0';
1880                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1881                 /*
1882                  * Write out any ISID value to APTPL metadata that was included
1883                  * in the original registration.
1884                  */
1885                 if (pr_reg->isid_present_at_reg)
1886                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1887                                         pr_reg->pr_reg_isid);
1888                 /*
1889                  * Include special metadata if the pr_reg matches the
1890                  * reservation holder.
1891                  */
1892                 if (dev->dev_pr_res_holder == pr_reg) {
1893                         snprintf(tmp, 512, "PR_REG_START: %d"
1894                                 "\ninitiator_fabric=%s\n"
1895                                 "initiator_node=%s\n%s"
1896                                 "sa_res_key=%llu\n"
1897                                 "res_holder=1\nres_type=%02x\n"
1898                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1899                                 "mapped_lun=%llu\n", reg_count,
1900                                 tpg->se_tpg_tfo->fabric_name,
1901                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1902                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1903                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1904                                 pr_reg->pr_res_mapped_lun);
1905                 } else {
1906                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1907                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1908                                 "sa_res_key=%llu\nres_holder=0\n"
1909                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1910                                 reg_count, tpg->se_tpg_tfo->fabric_name,
1911                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1912                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1913                                 pr_reg->pr_res_mapped_lun);
1914                 }
1915
1916                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1917                         pr_err("Unable to update renaming APTPL metadata,"
1918                                " reallocating larger buffer\n");
1919                         ret = -EMSGSIZE;
1920                         goto out;
1921                 }
1922                 len += sprintf(buf+len, "%s", tmp);
1923
1924                 /*
1925                  * Include information about the associated SCSI target port.
1926                  */
1927                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1928                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1929                         " %d\n", tpg->se_tpg_tfo->fabric_name,
1930                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1931                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1932                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1933                         reg_count);
1934
1935                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1936                         pr_err("Unable to update renaming APTPL metadata,"
1937                                " reallocating larger buffer\n");
1938                         ret = -EMSGSIZE;
1939                         goto out;
1940                 }
1941                 len += sprintf(buf+len, "%s", tmp);
1942                 reg_count++;
1943         }
1944
1945         if (!reg_count)
1946                 len += sprintf(buf+len, "No Registrations or Reservations");
1947
1948 out:
1949         spin_unlock(&dev->t10_pr.registration_lock);
1950         spin_unlock(&dev->dev_reservation_lock);
1951
1952         return ret;
1953 }
1954
1955 static int __core_scsi3_write_aptpl_to_file(
1956         struct se_device *dev,
1957         unsigned char *buf)
1958 {
1959         struct t10_wwn *wwn = &dev->t10_wwn;
1960         struct file *file;
1961         int flags = O_RDWR | O_CREAT | O_TRUNC;
1962         char *path;
1963         u32 pr_aptpl_buf_len;
1964         int ret;
1965         loff_t pos = 0;
1966
1967         path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
1968                         &wwn->unit_serial[0]);
1969         if (!path)
1970                 return -ENOMEM;
1971
1972         file = filp_open(path, flags, 0600);
1973         if (IS_ERR(file)) {
1974                 pr_err("filp_open(%s) for APTPL metadata"
1975                         " failed\n", path);
1976                 kfree(path);
1977                 return PTR_ERR(file);
1978         }
1979
1980         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1981
1982         ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
1983
1984         if (ret < 0)
1985                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1986         fput(file);
1987         kfree(path);
1988
1989         return (ret < 0) ? -EIO : 0;
1990 }
1991
1992 /*
1993  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1994  * write out the updated metadata to struct file for this SCSI device.
1995  */
1996 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1997 {
1998         unsigned char *buf;
1999         int rc, len = PR_APTPL_BUF_LEN;
2000
2001         if (!aptpl) {
2002                 char *null_buf = "No Registrations or Reservations\n";
2003
2004                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2005                 dev->t10_pr.pr_aptpl_active = 0;
2006                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2007
2008                 if (rc)
2009                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2010
2011                 return 0;
2012         }
2013 retry:
2014         buf = vzalloc(len);
2015         if (!buf)
2016                 return TCM_OUT_OF_RESOURCES;
2017
2018         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2019         if (rc < 0) {
2020                 vfree(buf);
2021                 len *= 2;
2022                 goto retry;
2023         }
2024
2025         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2026         if (rc != 0) {
2027                 pr_err("SPC-3 PR: Could not update APTPL\n");
2028                 vfree(buf);
2029                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2030         }
2031         dev->t10_pr.pr_aptpl_active = 1;
2032         vfree(buf);
2033         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2034         return 0;
2035 }
2036
2037 static sense_reason_t
2038 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2039                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2040 {
2041         struct se_session *se_sess = cmd->se_sess;
2042         struct se_device *dev = cmd->se_dev;
2043         struct se_lun *se_lun = cmd->se_lun;
2044         struct se_portal_group *se_tpg;
2045         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2046         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2047         unsigned char isid_buf[PR_REG_ISID_LEN] = { };
2048         unsigned char *isid_ptr = NULL;
2049         sense_reason_t ret = TCM_NO_SENSE;
2050         int pr_holder = 0, type;
2051
2052         if (!se_sess || !se_lun) {
2053                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2054                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2055         }
2056         se_tpg = se_sess->se_tpg;
2057
2058         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2059                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2060                                 PR_REG_ISID_LEN);
2061                 isid_ptr = &isid_buf[0];
2062         }
2063         /*
2064          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2065          */
2066         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2067         if (!pr_reg) {
2068                 if (res_key) {
2069                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2070                                 " for SA REGISTER, returning CONFLICT\n");
2071                         return TCM_RESERVATION_CONFLICT;
2072                 }
2073                 /*
2074                  * Do nothing but return GOOD status.
2075                  */
2076                 if (!sa_res_key)
2077                         return 0;
2078
2079                 if (!spec_i_pt) {
2080                         /*
2081                          * Perform the Service Action REGISTER on the Initiator
2082                          * Port Endpoint that the PRO was received from on the
2083                          * Logical Unit of the SCSI device server.
2084                          */
2085                         if (core_scsi3_alloc_registration(cmd->se_dev,
2086                                         se_sess->se_node_acl, cmd->se_lun,
2087                                         NULL, cmd->orig_fe_lun, isid_ptr,
2088                                         sa_res_key, all_tg_pt, aptpl,
2089                                         register_type, 0)) {
2090                                 pr_err("Unable to allocate"
2091                                         " struct t10_pr_registration\n");
2092                                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
2093                         }
2094                 } else {
2095                         /*
2096                          * Register both the Initiator port that received
2097                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2098                          * TransportID from Parameter list and loop through
2099                          * fabric dependent parameter list while calling
2100                          * logic from of core_scsi3_alloc_registration() for
2101                          * each TransportID provided SCSI Initiator Port/Device
2102                          */
2103                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2104                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2105                         if (ret != 0)
2106                                 return ret;
2107                 }
2108                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2109         }
2110
2111         /* ok, existing registration */
2112
2113         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2114                 pr_err("SPC-3 PR REGISTER: Received"
2115                        " res_key: 0x%016Lx does not match"
2116                        " existing SA REGISTER res_key:"
2117                        " 0x%016Lx\n", res_key,
2118                        pr_reg->pr_res_key);
2119                 ret = TCM_RESERVATION_CONFLICT;
2120                 goto out;
2121         }
2122
2123         if (spec_i_pt) {
2124                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2125                         " set on a registered nexus\n");
2126                 ret = TCM_INVALID_PARAMETER_LIST;
2127                 goto out;
2128         }
2129
2130         /*
2131          * An existing ALL_TG_PT=1 registration being released
2132          * must also set ALL_TG_PT=1 in the incoming PROUT.
2133          */
2134         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2135                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2136                         " registration exists, but ALL_TG_PT=1 bit not"
2137                         " present in received PROUT\n");
2138                 ret = TCM_INVALID_CDB_FIELD;
2139                 goto out;
2140         }
2141
2142         /*
2143          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2144          */
2145         if (sa_res_key) {
2146                 /*
2147                  * Increment PRgeneration counter for struct se_device"
2148                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2149                  * READ_KEYS service action.
2150                  */
2151                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2152                 pr_reg->pr_res_key = sa_res_key;
2153                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2154                          " Key for %s to: 0x%016Lx PRgeneration:"
2155                          " 0x%08x\n", cmd->se_tfo->fabric_name,
2156                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2157                          pr_reg->pr_reg_nacl->initiatorname,
2158                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2159
2160         } else {
2161                 /*
2162                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2163                  */
2164                 type = pr_reg->pr_res_type;
2165                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2166                                                               pr_reg);
2167                 if (pr_holder < 0) {
2168                         ret = TCM_RESERVATION_CONFLICT;
2169                         goto out;
2170                 }
2171
2172                 spin_lock(&pr_tmpl->registration_lock);
2173                 /*
2174                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2175                  * and matching pr_res_key.
2176                  */
2177                 if (pr_reg->pr_reg_all_tg_pt) {
2178                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2179                                         &pr_tmpl->registration_list,
2180                                         pr_reg_list) {
2181
2182                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2183                                         continue;
2184                                 if (pr_reg_p->pr_res_key != res_key)
2185                                         continue;
2186                                 if (pr_reg == pr_reg_p)
2187                                         continue;
2188                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2189                                            pr_reg_p->pr_reg_nacl->initiatorname))
2190                                         continue;
2191
2192                                 __core_scsi3_free_registration(dev,
2193                                                 pr_reg_p, NULL, 0);
2194                         }
2195                 }
2196
2197                 /*
2198                  * Release the calling I_T Nexus registration now..
2199                  */
2200                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2201                 pr_reg = NULL;
2202
2203                 /*
2204                  * From spc4r17, section 5.7.11.3 Unregistering
2205                  *
2206                  * If the persistent reservation is a registrants only
2207                  * type, the device server shall establish a unit
2208                  * attention condition for the initiator port associated
2209                  * with every registered I_T nexus except for the I_T
2210                  * nexus on which the PERSISTENT RESERVE OUT command was
2211                  * received, with the additional sense code set to
2212                  * RESERVATIONS RELEASED.
2213                  */
2214                 if (pr_holder &&
2215                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2216                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2217                         list_for_each_entry(pr_reg_p,
2218                                         &pr_tmpl->registration_list,
2219                                         pr_reg_list) {
2220
2221                                 target_ua_allocate_lun(
2222                                         pr_reg_p->pr_reg_nacl,
2223                                         pr_reg_p->pr_res_mapped_lun,
2224                                         0x2A,
2225                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2226                         }
2227                 }
2228
2229                 spin_unlock(&pr_tmpl->registration_lock);
2230         }
2231
2232         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2233
2234 out:
2235         if (pr_reg)
2236                 core_scsi3_put_pr_reg(pr_reg);
2237         return ret;
2238 }
2239
2240 unsigned char *core_scsi3_pr_dump_type(int type)
2241 {
2242         switch (type) {
2243         case PR_TYPE_WRITE_EXCLUSIVE:
2244                 return "Write Exclusive Access";
2245         case PR_TYPE_EXCLUSIVE_ACCESS:
2246                 return "Exclusive Access";
2247         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2248                 return "Write Exclusive Access, Registrants Only";
2249         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2250                 return "Exclusive Access, Registrants Only";
2251         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2252                 return "Write Exclusive Access, All Registrants";
2253         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2254                 return "Exclusive Access, All Registrants";
2255         default:
2256                 break;
2257         }
2258
2259         return "Unknown SPC-3 PR Type";
2260 }
2261
2262 static sense_reason_t
2263 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2264 {
2265         struct se_device *dev = cmd->se_dev;
2266         struct se_session *se_sess = cmd->se_sess;
2267         struct se_lun *se_lun = cmd->se_lun;
2268         struct t10_pr_registration *pr_reg, *pr_res_holder;
2269         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2270         char i_buf[PR_REG_ISID_ID_LEN] = { };
2271         sense_reason_t ret;
2272
2273         if (!se_sess || !se_lun) {
2274                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2275                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2276         }
2277         /*
2278          * Locate the existing *pr_reg via struct se_node_acl pointers
2279          */
2280         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2281                                 se_sess);
2282         if (!pr_reg) {
2283                 pr_err("SPC-3 PR: Unable to locate"
2284                         " PR_REGISTERED *pr_reg for RESERVE\n");
2285                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2286         }
2287         /*
2288          * From spc4r17 Section 5.7.9: Reserving:
2289          *
2290          * An application client creates a persistent reservation by issuing
2291          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2292          * a registered I_T nexus with the following parameters:
2293          *    a) RESERVATION KEY set to the value of the reservation key that is
2294          *       registered with the logical unit for the I_T nexus; and
2295          */
2296         if (res_key != pr_reg->pr_res_key) {
2297                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2298                         " does not match existing SA REGISTER res_key:"
2299                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2300                 ret = TCM_RESERVATION_CONFLICT;
2301                 goto out_put_pr_reg;
2302         }
2303         /*
2304          * From spc4r17 Section 5.7.9: Reserving:
2305          *
2306          * From above:
2307          *  b) TYPE field and SCOPE field set to the persistent reservation
2308          *     being created.
2309          *
2310          * Only one persistent reservation is allowed at a time per logical unit
2311          * and that persistent reservation has a scope of LU_SCOPE.
2312          */
2313         if (scope != PR_SCOPE_LU_SCOPE) {
2314                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2315                 ret = TCM_INVALID_PARAMETER_LIST;
2316                 goto out_put_pr_reg;
2317         }
2318         /*
2319          * See if we have an existing PR reservation holder pointer at
2320          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2321          * *pr_res_holder.
2322          */
2323         spin_lock(&dev->dev_reservation_lock);
2324         pr_res_holder = dev->dev_pr_res_holder;
2325         if (pr_res_holder) {
2326                 /*
2327                  * From spc4r17 Section 5.7.9: Reserving:
2328                  *
2329                  * If the device server receives a PERSISTENT RESERVE OUT
2330                  * command from an I_T nexus other than a persistent reservation
2331                  * holder (see 5.7.10) that attempts to create a persistent
2332                  * reservation when a persistent reservation already exists for
2333                  * the logical unit, then the command shall be completed with
2334                  * RESERVATION CONFLICT status.
2335                  */
2336                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2337                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2338                         pr_err("SPC-3 PR: Attempted RESERVE from"
2339                                 " [%s]: %s while reservation already held by"
2340                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2341                                 cmd->se_tfo->fabric_name,
2342                                 se_sess->se_node_acl->initiatorname,
2343                                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2344                                 pr_res_holder->pr_reg_nacl->initiatorname);
2345
2346                         spin_unlock(&dev->dev_reservation_lock);
2347                         ret = TCM_RESERVATION_CONFLICT;
2348                         goto out_put_pr_reg;
2349                 }
2350                 /*
2351                  * From spc4r17 Section 5.7.9: Reserving:
2352                  *
2353                  * If a persistent reservation holder attempts to modify the
2354                  * type or scope of an existing persistent reservation, the
2355                  * command shall be completed with RESERVATION CONFLICT status.
2356                  */
2357                 if ((pr_res_holder->pr_res_type != type) ||
2358                     (pr_res_holder->pr_res_scope != scope)) {
2359                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2360                         pr_err("SPC-3 PR: Attempted RESERVE from"
2361                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2362                                 " while reservation already held by [%s]: %s,"
2363                                 " returning RESERVATION_CONFLICT\n",
2364                                 cmd->se_tfo->fabric_name,
2365                                 se_sess->se_node_acl->initiatorname,
2366                                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2367                                 pr_res_holder->pr_reg_nacl->initiatorname);
2368
2369                         spin_unlock(&dev->dev_reservation_lock);
2370                         ret = TCM_RESERVATION_CONFLICT;
2371                         goto out_put_pr_reg;
2372                 }
2373                 /*
2374                  * From spc4r17 Section 5.7.9: Reserving:
2375                  *
2376                  * If the device server receives a PERSISTENT RESERVE OUT
2377                  * command with RESERVE service action where the TYPE field and
2378                  * the SCOPE field contain the same values as the existing type
2379                  * and scope from a persistent reservation holder, it shall not
2380                  * make any change to the existing persistent reservation and
2381                  * shall completethe command with GOOD status.
2382                  */
2383                 spin_unlock(&dev->dev_reservation_lock);
2384                 ret = 0;
2385                 goto out_put_pr_reg;
2386         }
2387         /*
2388          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2389          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2390          */
2391         pr_reg->pr_res_scope = scope;
2392         pr_reg->pr_res_type = type;
2393         pr_reg->pr_res_holder = 1;
2394         dev->dev_pr_res_holder = pr_reg;
2395         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2396
2397         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2398                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2399                 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),
2400                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2401         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2402                         cmd->se_tfo->fabric_name,
2403                         se_sess->se_node_acl->initiatorname,
2404                         i_buf);
2405         spin_unlock(&dev->dev_reservation_lock);
2406
2407         if (pr_tmpl->pr_aptpl_active)
2408                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2409
2410         ret = 0;
2411 out_put_pr_reg:
2412         core_scsi3_put_pr_reg(pr_reg);
2413         return ret;
2414 }
2415
2416 static sense_reason_t
2417 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2418                 u64 res_key)
2419 {
2420         switch (type) {
2421         case PR_TYPE_WRITE_EXCLUSIVE:
2422         case PR_TYPE_EXCLUSIVE_ACCESS:
2423         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2424         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2425         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2426         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2427                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2428         default:
2429                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2430                         " 0x%02x\n", type);
2431                 return TCM_INVALID_CDB_FIELD;
2432         }
2433 }
2434
2435 static void __core_scsi3_complete_pro_release(
2436         struct se_device *dev,
2437         struct se_node_acl *se_nacl,
2438         struct t10_pr_registration *pr_reg,
2439         int explicit,
2440         int unreg)
2441 {
2442         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2443         char i_buf[PR_REG_ISID_ID_LEN] = { };
2444         int pr_res_type = 0, pr_res_scope = 0;
2445
2446         lockdep_assert_held(&dev->dev_reservation_lock);
2447
2448         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2449         /*
2450          * Go ahead and release the current PR reservation holder.
2451          * If an All Registrants reservation is currently active and
2452          * a unregister operation is requested, replace the current
2453          * dev_pr_res_holder with another active registration.
2454          */
2455         if (dev->dev_pr_res_holder) {
2456                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2457                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2458                 dev->dev_pr_res_holder->pr_res_type = 0;
2459                 dev->dev_pr_res_holder->pr_res_scope = 0;
2460                 dev->dev_pr_res_holder->pr_res_holder = 0;
2461                 dev->dev_pr_res_holder = NULL;
2462         }
2463         if (!unreg)
2464                 goto out;
2465
2466         spin_lock(&dev->t10_pr.registration_lock);
2467         list_del_init(&pr_reg->pr_reg_list);
2468         /*
2469          * If the I_T nexus is a reservation holder, the persistent reservation
2470          * is of an all registrants type, and the I_T nexus is the last remaining
2471          * registered I_T nexus, then the device server shall also release the
2472          * persistent reservation.
2473          */
2474         if (!list_empty(&dev->t10_pr.registration_list) &&
2475             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2476              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2477                 dev->dev_pr_res_holder =
2478                         list_entry(dev->t10_pr.registration_list.next,
2479                                    struct t10_pr_registration, pr_reg_list);
2480                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2481                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2482                 dev->dev_pr_res_holder->pr_res_holder = 1;
2483         }
2484         spin_unlock(&dev->t10_pr.registration_lock);
2485 out:
2486         if (!dev->dev_pr_res_holder) {
2487                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2488                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2489                         tfo->fabric_name, (explicit) ? "explicit" :
2490                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2491                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2492         }
2493         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2494                 tfo->fabric_name, se_nacl->initiatorname,
2495                 i_buf);
2496         /*
2497          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2498          */
2499         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2500 }
2501
2502 static sense_reason_t
2503 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2504                 u64 res_key)
2505 {
2506         struct se_device *dev = cmd->se_dev;
2507         struct se_session *se_sess = cmd->se_sess;
2508         struct se_lun *se_lun = cmd->se_lun;
2509         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2510         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2511         sense_reason_t ret = 0;
2512
2513         if (!se_sess || !se_lun) {
2514                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2515                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2516         }
2517         /*
2518          * Locate the existing *pr_reg via struct se_node_acl pointers
2519          */
2520         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2521         if (!pr_reg) {
2522                 pr_err("SPC-3 PR: Unable to locate"
2523                         " PR_REGISTERED *pr_reg for RELEASE\n");
2524                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2525         }
2526         /*
2527          * From spc4r17 Section 5.7.11.2 Releasing:
2528          *
2529          * If there is no persistent reservation or in response to a persistent
2530          * reservation release request from a registered I_T nexus that is not a
2531          * persistent reservation holder (see 5.7.10), the device server shall
2532          * do the following:
2533          *
2534          *     a) Not release the persistent reservation, if any;
2535          *     b) Not remove any registrations; and
2536          *     c) Complete the command with GOOD status.
2537          */
2538         spin_lock(&dev->dev_reservation_lock);
2539         pr_res_holder = dev->dev_pr_res_holder;
2540         if (!pr_res_holder) {
2541                 /*
2542                  * No persistent reservation, return GOOD status.
2543                  */
2544                 spin_unlock(&dev->dev_reservation_lock);
2545                 goto out_put_pr_reg;
2546         }
2547
2548         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2549                 /*
2550                  * Release request from a registered I_T nexus that is not a
2551                  * persistent reservation holder. return GOOD status.
2552                  */
2553                 spin_unlock(&dev->dev_reservation_lock);
2554                 goto out_put_pr_reg;
2555         }
2556
2557         /*
2558          * From spc4r17 Section 5.7.11.2 Releasing:
2559          *
2560          * Only the persistent reservation holder (see 5.7.10) is allowed to
2561          * release a persistent reservation.
2562          *
2563          * An application client releases the persistent reservation by issuing
2564          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2565          * an I_T nexus that is a persistent reservation holder with the
2566          * following parameters:
2567          *
2568          *     a) RESERVATION KEY field set to the value of the reservation key
2569          *        that is registered with the logical unit for the I_T nexus;
2570          */
2571         if (res_key != pr_reg->pr_res_key) {
2572                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2573                         " does not match existing SA REGISTER res_key:"
2574                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2575                 spin_unlock(&dev->dev_reservation_lock);
2576                 ret = TCM_RESERVATION_CONFLICT;
2577                 goto out_put_pr_reg;
2578         }
2579         /*
2580          * From spc4r17 Section 5.7.11.2 Releasing and above:
2581          *
2582          * b) TYPE field and SCOPE field set to match the persistent
2583          *    reservation being released.
2584          */
2585         if ((pr_res_holder->pr_res_type != type) ||
2586             (pr_res_holder->pr_res_scope != scope)) {
2587                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2588                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2589                         " reservation from [%s]: %s with different TYPE "
2590                         "and/or SCOPE  while reservation already held by"
2591                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2592                         cmd->se_tfo->fabric_name,
2593                         se_sess->se_node_acl->initiatorname,
2594                         pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2595                         pr_res_holder->pr_reg_nacl->initiatorname);
2596
2597                 spin_unlock(&dev->dev_reservation_lock);
2598                 ret = TCM_RESERVATION_CONFLICT;
2599                 goto out_put_pr_reg;
2600         }
2601         /*
2602          * In response to a persistent reservation release request from the
2603          * persistent reservation holder the device server shall perform a
2604          * release by doing the following as an uninterrupted series of actions:
2605          * a) Release the persistent reservation;
2606          * b) Not remove any registration(s);
2607          * c) If the released persistent reservation is a registrants only type
2608          * or all registrants type persistent reservation,
2609          *    the device server shall establish a unit attention condition for
2610          *    the initiator port associated with every regis-
2611          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2612          *    RESERVE OUT command with RELEASE service action was received,
2613          *    with the additional sense code set to RESERVATIONS RELEASED; and
2614          * d) If the persistent reservation is of any other type, the device
2615          *    server shall not establish a unit attention condition.
2616          */
2617         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2618                                           pr_reg, 1, 0);
2619
2620         spin_unlock(&dev->dev_reservation_lock);
2621
2622         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2623             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2624             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2625             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2626                 /*
2627                  * If no UNIT ATTENTION conditions will be established for
2628                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2629                  * go ahead and check for APTPL=1 update+write below
2630                  */
2631                 goto write_aptpl;
2632         }
2633
2634         spin_lock(&pr_tmpl->registration_lock);
2635         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2636                         pr_reg_list) {
2637                 /*
2638                  * Do not establish a UNIT ATTENTION condition
2639                  * for the calling I_T Nexus
2640                  */
2641                 if (pr_reg_p == pr_reg)
2642                         continue;
2643
2644                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2645                                 pr_reg_p->pr_res_mapped_lun,
2646                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2647         }
2648         spin_unlock(&pr_tmpl->registration_lock);
2649
2650 write_aptpl:
2651         if (pr_tmpl->pr_aptpl_active)
2652                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2653
2654 out_put_pr_reg:
2655         core_scsi3_put_pr_reg(pr_reg);
2656         return ret;
2657 }
2658
2659 static sense_reason_t
2660 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2661 {
2662         struct se_device *dev = cmd->se_dev;
2663         struct se_node_acl *pr_reg_nacl;
2664         struct se_session *se_sess = cmd->se_sess;
2665         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2666         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2667         u64 pr_res_mapped_lun = 0;
2668         int calling_it_nexus = 0;
2669         /*
2670          * Locate the existing *pr_reg via struct se_node_acl pointers
2671          */
2672         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2673                         se_sess->se_node_acl, se_sess);
2674         if (!pr_reg_n) {
2675                 pr_err("SPC-3 PR: Unable to locate"
2676                         " PR_REGISTERED *pr_reg for CLEAR\n");
2677                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2678         }
2679         /*
2680          * From spc4r17 section 5.7.11.6, Clearing:
2681          *
2682          * Any application client may release the persistent reservation and
2683          * remove all registrations from a device server by issuing a
2684          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2685          * registered I_T nexus with the following parameter:
2686          *
2687          *      a) RESERVATION KEY field set to the value of the reservation key
2688          *         that is registered with the logical unit for the I_T nexus.
2689          */
2690         if (res_key != pr_reg_n->pr_res_key) {
2691                 pr_err("SPC-3 PR REGISTER: Received"
2692                         " res_key: 0x%016Lx does not match"
2693                         " existing SA REGISTER res_key:"
2694                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2695                 core_scsi3_put_pr_reg(pr_reg_n);
2696                 return TCM_RESERVATION_CONFLICT;
2697         }
2698         /*
2699          * a) Release the persistent reservation, if any;
2700          */
2701         spin_lock(&dev->dev_reservation_lock);
2702         pr_res_holder = dev->dev_pr_res_holder;
2703         if (pr_res_holder) {
2704                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2705                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2706                                                   pr_res_holder, 0, 0);
2707         }
2708         spin_unlock(&dev->dev_reservation_lock);
2709         /*
2710          * b) Remove all registration(s) (see spc4r17 5.7.7);
2711          */
2712         spin_lock(&pr_tmpl->registration_lock);
2713         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2714                         &pr_tmpl->registration_list, pr_reg_list) {
2715
2716                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2717                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2718                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2719                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2720                                         calling_it_nexus);
2721                 /*
2722                  * e) Establish a unit attention condition for the initiator
2723                  *    port associated with every registered I_T nexus other
2724                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2725                  *    command with CLEAR service action was received, with the
2726                  *    additional sense code set to RESERVATIONS PREEMPTED.
2727                  */
2728                 if (!calling_it_nexus)
2729                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2730                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2731         }
2732         spin_unlock(&pr_tmpl->registration_lock);
2733
2734         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2735                 cmd->se_tfo->fabric_name);
2736
2737         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2738
2739         core_scsi3_pr_generation(dev);
2740         return 0;
2741 }
2742
2743 static void __core_scsi3_complete_pro_preempt(
2744         struct se_device *dev,
2745         struct t10_pr_registration *pr_reg,
2746         struct list_head *preempt_and_abort_list,
2747         int type,
2748         int scope,
2749         enum preempt_type preempt_type)
2750 {
2751         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2752         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2753         char i_buf[PR_REG_ISID_ID_LEN] = { };
2754
2755         lockdep_assert_held(&dev->dev_reservation_lock);
2756
2757         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2758         /*
2759          * Do an implicit RELEASE of the existing reservation.
2760          */
2761         if (dev->dev_pr_res_holder)
2762                 __core_scsi3_complete_pro_release(dev, nacl,
2763                                                   dev->dev_pr_res_holder, 0, 0);
2764
2765         dev->dev_pr_res_holder = pr_reg;
2766         pr_reg->pr_res_holder = 1;
2767         pr_reg->pr_res_type = type;
2768         pr_reg->pr_res_scope = scope;
2769
2770         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2771                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2772                 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2773                 core_scsi3_pr_dump_type(type),
2774                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2775         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2776                 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2777                 nacl->initiatorname, i_buf);
2778         /*
2779          * For PREEMPT_AND_ABORT, add the preempting reservation's
2780          * struct t10_pr_registration to the list that will be compared
2781          * against received CDBs..
2782          */
2783         if (preempt_and_abort_list)
2784                 list_add_tail(&pr_reg->pr_reg_abort_list,
2785                                 preempt_and_abort_list);
2786 }
2787
2788 static void core_scsi3_release_preempt_and_abort(
2789         struct list_head *preempt_and_abort_list,
2790         struct t10_pr_registration *pr_reg_holder)
2791 {
2792         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2793
2794         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2795                                 pr_reg_abort_list) {
2796
2797                 list_del(&pr_reg->pr_reg_abort_list);
2798                 if (pr_reg_holder == pr_reg)
2799                         continue;
2800                 if (pr_reg->pr_res_holder) {
2801                         pr_warn("pr_reg->pr_res_holder still set\n");
2802                         continue;
2803                 }
2804
2805                 pr_reg->pr_reg_deve = NULL;
2806                 pr_reg->pr_reg_nacl = NULL;
2807                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2808         }
2809 }
2810
2811 static sense_reason_t
2812 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2813                 u64 sa_res_key, enum preempt_type preempt_type)
2814 {
2815         struct se_device *dev = cmd->se_dev;
2816         struct se_node_acl *pr_reg_nacl;
2817         struct se_session *se_sess = cmd->se_sess;
2818         LIST_HEAD(preempt_and_abort_list);
2819         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2820         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2821         u64 pr_res_mapped_lun = 0;
2822         int all_reg = 0, calling_it_nexus = 0;
2823         bool sa_res_key_unmatched = sa_res_key != 0;
2824         int prh_type = 0, prh_scope = 0;
2825
2826         if (!se_sess)
2827                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2828
2829         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2830                                 se_sess);
2831         if (!pr_reg_n) {
2832                 pr_err("SPC-3 PR: Unable to locate"
2833                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2834                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2835                 return TCM_RESERVATION_CONFLICT;
2836         }
2837         if (pr_reg_n->pr_res_key != res_key) {
2838                 core_scsi3_put_pr_reg(pr_reg_n);
2839                 return TCM_RESERVATION_CONFLICT;
2840         }
2841         if (scope != PR_SCOPE_LU_SCOPE) {
2842                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2843                 core_scsi3_put_pr_reg(pr_reg_n);
2844                 return TCM_INVALID_PARAMETER_LIST;
2845         }
2846
2847         spin_lock(&dev->dev_reservation_lock);
2848         pr_res_holder = dev->dev_pr_res_holder;
2849         if (pr_res_holder &&
2850            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2851             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2852                 all_reg = 1;
2853
2854         if (!all_reg && !sa_res_key) {
2855                 spin_unlock(&dev->dev_reservation_lock);
2856                 core_scsi3_put_pr_reg(pr_reg_n);
2857                 return TCM_INVALID_PARAMETER_LIST;
2858         }
2859         /*
2860          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2861          *
2862          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2863          * persistent reservation holder or there is no persistent reservation
2864          * holder (i.e., there is no persistent reservation), then the device
2865          * server shall perform a preempt by doing the following in an
2866          * uninterrupted series of actions. (See below..)
2867          */
2868         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2869                 /*
2870                  * No existing or SA Reservation Key matching reservations..
2871                  *
2872                  * PROUT SA PREEMPT with All Registrant type reservations are
2873                  * allowed to be processed without a matching SA Reservation Key
2874                  */
2875                 spin_lock(&pr_tmpl->registration_lock);
2876                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2877                                 &pr_tmpl->registration_list, pr_reg_list) {
2878                         /*
2879                          * Removing of registrations in non all registrants
2880                          * type reservations without a matching SA reservation
2881                          * key.
2882                          *
2883                          * a) Remove the registrations for all I_T nexuses
2884                          *    specified by the SERVICE ACTION RESERVATION KEY
2885                          *    field;
2886                          * b) Ignore the contents of the SCOPE and TYPE fields;
2887                          * c) Process tasks as defined in 5.7.1; and
2888                          * d) Establish a unit attention condition for the
2889                          *    initiator port associated with every I_T nexus
2890                          *    that lost its registration other than the I_T
2891                          *    nexus on which the PERSISTENT RESERVE OUT command
2892                          *    was received, with the additional sense code set
2893                          *    to REGISTRATIONS PREEMPTED.
2894                          */
2895                         if (!all_reg) {
2896                                 if (pr_reg->pr_res_key != sa_res_key)
2897                                         continue;
2898                                 sa_res_key_unmatched = false;
2899
2900                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2901                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2902                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2903                                 __core_scsi3_free_registration(dev, pr_reg,
2904                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2905                                                 NULL, calling_it_nexus);
2906                         } else {
2907                                 /*
2908                                  * Case for any existing all registrants type
2909                                  * reservation, follow logic in spc4r17 section
2910                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2911                                  *
2912                                  * For a ZERO SA Reservation key, release
2913                                  * all other registrations and do an implicit
2914                                  * release of active persistent reservation.
2915                                  *
2916                                  * For a non-ZERO SA Reservation key, only
2917                                  * release the matching reservation key from
2918                                  * registrations.
2919                                  */
2920                                 if ((sa_res_key) &&
2921                                      (pr_reg->pr_res_key != sa_res_key))
2922                                         continue;
2923                                 sa_res_key_unmatched = false;
2924
2925                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2926                                 if (calling_it_nexus)
2927                                         continue;
2928
2929                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2930                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2931                                 __core_scsi3_free_registration(dev, pr_reg,
2932                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2933                                                 NULL, 0);
2934                         }
2935                         if (!calling_it_nexus)
2936                                 target_ua_allocate_lun(pr_reg_nacl,
2937                                         pr_res_mapped_lun, 0x2A,
2938                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2939                 }
2940                 spin_unlock(&pr_tmpl->registration_lock);
2941                 /*
2942                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2943                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2944                  * RESERVATION KEY field to a value that does not match any
2945                  * registered reservation key, then the device server shall
2946                  * complete the command with RESERVATION CONFLICT status.
2947                  */
2948                 if (sa_res_key_unmatched) {
2949                         spin_unlock(&dev->dev_reservation_lock);
2950                         core_scsi3_put_pr_reg(pr_reg_n);
2951                         return TCM_RESERVATION_CONFLICT;
2952                 }
2953                 /*
2954                  * For an existing all registrants type reservation
2955                  * with a zero SA rservation key, preempt the existing
2956                  * reservation with the new PR type and scope.
2957                  */
2958                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2959                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2960                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2961                                 type, scope, preempt_type);
2962                 }
2963
2964                 spin_unlock(&dev->dev_reservation_lock);
2965
2966                 /*
2967                  * SPC-4 5.12.11.2.6 Preempting and aborting
2968                  * The actions described in this subclause shall be performed
2969                  * for all I_T nexuses that are registered with the non-zero
2970                  * SERVICE ACTION RESERVATION KEY value, without regard for
2971                  * whether the preempted I_T nexuses hold the persistent
2972                  * reservation. If the SERVICE ACTION RESERVATION KEY field is
2973                  * set to zero and an all registrants persistent reservation is
2974                  * present, the device server shall abort all commands for all
2975                  * registered I_T nexuses.
2976                  */
2977                 if (preempt_type == PREEMPT_AND_ABORT) {
2978                         core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list,
2979                                            cmd);
2980                         core_scsi3_release_preempt_and_abort(
2981                                 &preempt_and_abort_list, pr_reg_n);
2982                 }
2983
2984                 if (pr_tmpl->pr_aptpl_active)
2985                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2986
2987                 core_scsi3_put_pr_reg(pr_reg_n);
2988                 core_scsi3_pr_generation(cmd->se_dev);
2989                 return 0;
2990         }
2991         /*
2992          * The PREEMPTing SA reservation key matches that of the
2993          * existing persistent reservation, first, we check if
2994          * we are preempting our own reservation.
2995          * From spc4r17, section 5.7.11.4.3 Preempting
2996          * persistent reservations and registration handling
2997          *
2998          * If an all registrants persistent reservation is not
2999          * present, it is not an error for the persistent
3000          * reservation holder to preempt itself (i.e., a
3001          * PERSISTENT RESERVE OUT with a PREEMPT service action
3002          * or a PREEMPT AND ABORT service action with the
3003          * SERVICE ACTION RESERVATION KEY value equal to the
3004          * persistent reservation holder's reservation key that
3005          * is received from the persistent reservation holder).
3006          * In that case, the device server shall establish the
3007          * new persistent reservation and maintain the
3008          * registration.
3009          */
3010         prh_type = pr_res_holder->pr_res_type;
3011         prh_scope = pr_res_holder->pr_res_scope;
3012         /*
3013          * If the SERVICE ACTION RESERVATION KEY field identifies a
3014          * persistent reservation holder (see 5.7.10), the device
3015          * server shall perform a preempt by doing the following as
3016          * an uninterrupted series of actions:
3017          *
3018          * a) Release the persistent reservation for the holder
3019          *    identified by the SERVICE ACTION RESERVATION KEY field;
3020          */
3021         if (pr_reg_n != pr_res_holder)
3022                 __core_scsi3_complete_pro_release(dev,
3023                                                   pr_res_holder->pr_reg_nacl,
3024                                                   dev->dev_pr_res_holder, 0, 0);
3025         /*
3026          * b) Remove the registrations for all I_T nexuses identified
3027          *    by the SERVICE ACTION RESERVATION KEY field, except the
3028          *    I_T nexus that is being used for the PERSISTENT RESERVE
3029          *    OUT command. If an all registrants persistent reservation
3030          *    is present and the SERVICE ACTION RESERVATION KEY field
3031          *    is set to zero, then all registrations shall be removed
3032          *    except for that of the I_T nexus that is being used for
3033          *    the PERSISTENT RESERVE OUT command;
3034          */
3035         spin_lock(&pr_tmpl->registration_lock);
3036         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3037                         &pr_tmpl->registration_list, pr_reg_list) {
3038
3039                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3040                 if (calling_it_nexus)
3041                         continue;
3042
3043                 if (sa_res_key && pr_reg->pr_res_key != sa_res_key)
3044                         continue;
3045
3046                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3047                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3048                 __core_scsi3_free_registration(dev, pr_reg,
3049                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3050                                 calling_it_nexus);
3051                 /*
3052                  * e) Establish a unit attention condition for the initiator
3053                  *    port associated with every I_T nexus that lost its
3054                  *    persistent reservation and/or registration, with the
3055                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3056                  */
3057                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3058                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3059         }
3060         spin_unlock(&pr_tmpl->registration_lock);
3061         /*
3062          * c) Establish a persistent reservation for the preempting
3063          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3064          */
3065         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3066                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3067                         type, scope, preempt_type);
3068         /*
3069          * d) Process tasks as defined in 5.7.1;
3070          * e) See above..
3071          * f) If the type or scope has changed, then for every I_T nexus
3072          *    whose reservation key was not removed, except for the I_T
3073          *    nexus on which the PERSISTENT RESERVE OUT command was
3074          *    received, the device server shall establish a unit
3075          *    attention condition for the initiator port associated with
3076          *    that I_T nexus, with the additional sense code set to
3077          *    RESERVATIONS RELEASED. If the type or scope have not
3078          *    changed, then no unit attention condition(s) shall be
3079          *    established for this reason.
3080          */
3081         if ((prh_type != type) || (prh_scope != scope)) {
3082                 spin_lock(&pr_tmpl->registration_lock);
3083                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3084                                 &pr_tmpl->registration_list, pr_reg_list) {
3085
3086                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3087                         if (calling_it_nexus)
3088                                 continue;
3089
3090                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3091                                         pr_reg->pr_res_mapped_lun, 0x2A,
3092                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3093                 }
3094                 spin_unlock(&pr_tmpl->registration_lock);
3095         }
3096         spin_unlock(&dev->dev_reservation_lock);
3097         /*
3098          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3099          * All received CDBs for the matching existing reservation and
3100          * registrations undergo ABORT_TASK logic.
3101          *
3102          * From there, core_scsi3_release_preempt_and_abort() will
3103          * release every registration in the list (which have already
3104          * been removed from the primary pr_reg list), except the
3105          * new persistent reservation holder, the calling Initiator Port.
3106          */
3107         if (preempt_type == PREEMPT_AND_ABORT) {
3108                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3109                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3110                                                 pr_reg_n);
3111         }
3112
3113         if (pr_tmpl->pr_aptpl_active)
3114                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3115
3116         core_scsi3_put_pr_reg(pr_reg_n);
3117         core_scsi3_pr_generation(cmd->se_dev);
3118         return 0;
3119 }
3120
3121 static sense_reason_t
3122 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3123                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3124 {
3125         switch (type) {
3126         case PR_TYPE_WRITE_EXCLUSIVE:
3127         case PR_TYPE_EXCLUSIVE_ACCESS:
3128         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3129         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3130         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3131         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3132                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3133                                               sa_res_key, preempt_type);
3134         default:
3135                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3136                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3137                 return TCM_INVALID_CDB_FIELD;
3138         }
3139 }
3140
3141
3142 static sense_reason_t
3143 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3144                 u64 sa_res_key, int aptpl, int unreg)
3145 {
3146         struct se_session *se_sess = cmd->se_sess;
3147         struct se_device *dev = cmd->se_dev;
3148         struct se_dev_entry *dest_se_deve = NULL;
3149         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3150         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3151         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3152         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3153         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3154         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3155         unsigned char *buf;
3156         const unsigned char *initiator_str;
3157         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
3158         u32 tid_len, tmp_tid_len;
3159         int new_reg = 0, type, scope, matching_iname;
3160         sense_reason_t ret;
3161         unsigned short rtpi;
3162         unsigned char proto_ident;
3163
3164         if (!se_sess || !se_lun) {
3165                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3166                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3167         }
3168
3169         se_tpg = se_sess->se_tpg;
3170         tf_ops = se_tpg->se_tpg_tfo;
3171         /*
3172          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3173          *      Register behaviors for a REGISTER AND MOVE service action
3174          *
3175          * Locate the existing *pr_reg via struct se_node_acl pointers
3176          */
3177         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3178                                 se_sess);
3179         if (!pr_reg) {
3180                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3181                         " *pr_reg for REGISTER_AND_MOVE\n");
3182                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3183         }
3184         /*
3185          * The provided reservation key much match the existing reservation key
3186          * provided during this initiator's I_T nexus registration.
3187          */
3188         if (res_key != pr_reg->pr_res_key) {
3189                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3190                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3191                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3192                 ret = TCM_RESERVATION_CONFLICT;
3193                 goto out_put_pr_reg;
3194         }
3195         /*
3196          * The service active reservation key needs to be non zero
3197          */
3198         if (!sa_res_key) {
3199                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3200                         " sa_res_key\n");
3201                 ret = TCM_INVALID_PARAMETER_LIST;
3202                 goto out_put_pr_reg;
3203         }
3204
3205         /*
3206          * Determine the Relative Target Port Identifier where the reservation
3207          * will be moved to for the TransportID containing SCSI initiator WWN
3208          * information.
3209          */
3210         buf = transport_kmap_data_sg(cmd);
3211         if (!buf) {
3212                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3213                 goto out_put_pr_reg;
3214         }
3215
3216         rtpi = get_unaligned_be16(&buf[18]);
3217         tid_len = get_unaligned_be32(&buf[20]);
3218         transport_kunmap_data_sg(cmd);
3219         buf = NULL;
3220
3221         if ((tid_len + 24) != cmd->data_length) {
3222                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3223                         " does not equal CDB data_length: %u\n", tid_len,
3224                         cmd->data_length);
3225                 ret = TCM_INVALID_PARAMETER_LIST;
3226                 goto out_put_pr_reg;
3227         }
3228
3229         spin_lock(&dev->se_port_lock);
3230         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3231                 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi)
3232                         continue;
3233                 dest_se_tpg = tmp_lun->lun_tpg;
3234                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3235                 if (!dest_tf_ops)
3236                         continue;
3237
3238                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3239                 spin_unlock(&dev->se_port_lock);
3240
3241                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3242                         pr_err("core_scsi3_tpg_depend_item() failed"
3243                                 " for dest_se_tpg\n");
3244                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3245                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3246                         goto out_put_pr_reg;
3247                 }
3248
3249                 spin_lock(&dev->se_port_lock);
3250                 break;
3251         }
3252         spin_unlock(&dev->se_port_lock);
3253
3254         if (!dest_se_tpg || !dest_tf_ops) {
3255                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3256                         " fabric ops from Relative Target Port Identifier:"
3257                         " %hu\n", rtpi);
3258                 ret = TCM_INVALID_PARAMETER_LIST;
3259                 goto out_put_pr_reg;
3260         }
3261
3262         buf = transport_kmap_data_sg(cmd);
3263         if (!buf) {
3264                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3265                 goto out_put_pr_reg;
3266         }
3267         proto_ident = (buf[24] & 0x0f);
3268
3269         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3270                         " 0x%02x\n", proto_ident);
3271
3272         if (proto_ident != dest_se_tpg->proto_id) {
3273                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3274                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3275                         " from fabric: %s\n", proto_ident,
3276                         dest_se_tpg->proto_id,
3277                         dest_tf_ops->fabric_name);
3278                 ret = TCM_INVALID_PARAMETER_LIST;
3279                 goto out;
3280         }
3281         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3282                         &buf[24], &tmp_tid_len, &iport_ptr);
3283         if (!initiator_str) {
3284                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3285                         " initiator_str from Transport ID\n");
3286                 ret = TCM_INVALID_PARAMETER_LIST;
3287                 goto out;
3288         }
3289
3290         transport_kunmap_data_sg(cmd);
3291         buf = NULL;
3292
3293         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3294                 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?
3295                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3296                 iport_ptr : "");
3297         /*
3298          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3299          * action specifies a TransportID that is the same as the initiator port
3300          * of the I_T nexus for the command received, then the command shall
3301          * be terminated with CHECK CONDITION status, with the sense key set to
3302          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3303          * IN PARAMETER LIST.
3304          */
3305         pr_reg_nacl = pr_reg->pr_reg_nacl;
3306         matching_iname = (!strcmp(initiator_str,
3307                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3308         if (!matching_iname)
3309                 goto after_iport_check;
3310
3311         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3312                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3313                         " matches: %s on received I_T Nexus\n", initiator_str,
3314                         pr_reg_nacl->initiatorname);
3315                 ret = TCM_INVALID_PARAMETER_LIST;
3316                 goto out;
3317         }
3318         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3319                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3320                         " matches: %s %s on received I_T Nexus\n",
3321                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3322                         pr_reg->pr_reg_isid);
3323                 ret = TCM_INVALID_PARAMETER_LIST;
3324                 goto out;
3325         }
3326 after_iport_check:
3327         /*
3328          * Locate the destination struct se_node_acl from the received Transport ID
3329          */
3330         mutex_lock(&dest_se_tpg->acl_node_mutex);
3331         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3332                                 initiator_str);
3333         if (dest_node_acl)
3334                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3335         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3336
3337         if (!dest_node_acl) {
3338                 pr_err("Unable to locate %s dest_node_acl for"
3339                         " TransportID%s\n", dest_tf_ops->fabric_name,
3340                         initiator_str);
3341                 ret = TCM_INVALID_PARAMETER_LIST;
3342                 goto out;
3343         }
3344
3345         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3346                 pr_err("core_scsi3_nodeacl_depend_item() for"
3347                         " dest_node_acl\n");
3348                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3349                 dest_node_acl = NULL;
3350                 ret = TCM_INVALID_PARAMETER_LIST;
3351                 goto out;
3352         }
3353
3354         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3355                 " %s from TransportID\n", dest_tf_ops->fabric_name,
3356                 dest_node_acl->initiatorname);
3357
3358         /*
3359          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3360          * PORT IDENTIFIER.
3361          */
3362         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3363         if (!dest_se_deve) {
3364                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3365                         " %hu\n",  dest_tf_ops->fabric_name, rtpi);
3366                 ret = TCM_INVALID_PARAMETER_LIST;
3367                 goto out;
3368         }
3369
3370         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3371                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3372                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3373                 dest_se_deve = NULL;
3374                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3375                 goto out;
3376         }
3377
3378         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3379                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3380                 dest_tf_ops->fabric_name, dest_node_acl->initiatorname,
3381                 dest_se_deve->mapped_lun);
3382
3383         /*
3384          * A persistent reservation needs to already existing in order to
3385          * successfully complete the REGISTER_AND_MOVE service action..
3386          */
3387         spin_lock(&dev->dev_reservation_lock);
3388         pr_res_holder = dev->dev_pr_res_holder;
3389         if (!pr_res_holder) {
3390                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3391                         " currently held\n");
3392                 spin_unlock(&dev->dev_reservation_lock);
3393                 ret = TCM_INVALID_CDB_FIELD;
3394                 goto out;
3395         }
3396         /*
3397          * The received on I_T Nexus must be the reservation holder.
3398          *
3399          * From spc4r17 section 5.7.8  Table 50 --
3400          *      Register behaviors for a REGISTER AND MOVE service action
3401          */
3402         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3403                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3404                         " Nexus is not reservation holder\n");
3405                 spin_unlock(&dev->dev_reservation_lock);
3406                 ret = TCM_RESERVATION_CONFLICT;
3407                 goto out;
3408         }
3409         /*
3410          * From spc4r17 section 5.7.8: registering and moving reservation
3411          *
3412          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3413          * action is received and the established persistent reservation is a
3414          * Write Exclusive - All Registrants type or Exclusive Access -
3415          * All Registrants type reservation, then the command shall be completed
3416          * with RESERVATION CONFLICT status.
3417          */
3418         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3419             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3420                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3421                         " reservation for type: %s\n",
3422                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3423                 spin_unlock(&dev->dev_reservation_lock);
3424                 ret = TCM_RESERVATION_CONFLICT;
3425                 goto out;
3426         }
3427         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3428         /*
3429          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3430          */
3431         type = pr_res_holder->pr_res_type;
3432         scope = pr_res_holder->pr_res_type;
3433         /*
3434          * c) Associate the reservation key specified in the SERVICE ACTION
3435          *    RESERVATION KEY field with the I_T nexus specified as the
3436          *    destination of the register and move, where:
3437          *    A) The I_T nexus is specified by the TransportID and the
3438          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3439          *    B) Regardless of the TransportID format used, the association for
3440          *       the initiator port is based on either the initiator port name
3441          *       (see 3.1.71) on SCSI transport protocols where port names are
3442          *       required or the initiator port identifier (see 3.1.70) on SCSI
3443          *       transport protocols where port names are not required;
3444          * d) Register the reservation key specified in the SERVICE ACTION
3445          *    RESERVATION KEY field;
3446          *
3447          * Also, It is not an error for a REGISTER AND MOVE service action to
3448          * register an I_T nexus that is already registered with the same
3449          * reservation key or a different reservation key.
3450          */
3451         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3452                                         iport_ptr);
3453         if (!dest_pr_reg) {
3454                 struct se_lun *dest_lun = dest_se_deve->se_lun;
3455
3456                 spin_unlock(&dev->dev_reservation_lock);
3457                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3458                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3459                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3460                         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3461                         goto out;
3462                 }
3463                 spin_lock(&dev->dev_reservation_lock);
3464                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3465                                                 iport_ptr);
3466                 new_reg = 1;
3467         } else {
3468                 /*
3469                  * e) Retain the reservation key specified in the SERVICE ACTION
3470                  *    RESERVATION KEY field and associated information;
3471                  */
3472                 dest_pr_reg->pr_res_key = sa_res_key;
3473         }
3474         /*
3475          * f) Release the persistent reservation for the persistent reservation
3476          *    holder (i.e., the I_T nexus on which the
3477          */
3478         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3479                                           dev->dev_pr_res_holder, 0, 0);
3480         /*
3481          * g) Move the persistent reservation to the specified I_T nexus using
3482          *    the same scope and type as the persistent reservation released in
3483          *    item f); and
3484          */
3485         dev->dev_pr_res_holder = dest_pr_reg;
3486         dest_pr_reg->pr_res_holder = 1;
3487         dest_pr_reg->pr_res_type = type;
3488         pr_reg->pr_res_scope = scope;
3489         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3490         /*
3491          * Increment PRGeneration for existing registrations..
3492          */
3493         if (!new_reg)
3494                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3495         spin_unlock(&dev->dev_reservation_lock);
3496
3497         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3498                 " created new reservation holder TYPE: %s on object RTPI:"
3499                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,
3500                 core_scsi3_pr_dump_type(type), rtpi,
3501                 dest_pr_reg->pr_res_generation);
3502         pr_debug("SPC-3 PR Successfully moved reservation from"
3503                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3504                 tf_ops->fabric_name, pr_reg_nacl->initiatorname,
3505                 i_buf, dest_tf_ops->fabric_name,
3506                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3507                 iport_ptr : "");
3508         /*
3509          * It is now safe to release configfs group dependencies for destination
3510          * of Transport ID Initiator Device/Port Identifier
3511          */
3512         core_scsi3_lunacl_undepend_item(dest_se_deve);
3513         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3514         core_scsi3_tpg_undepend_item(dest_se_tpg);
3515         /*
3516          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3517          * nexus on which PERSISTENT RESERVE OUT command was received.
3518          */
3519         if (unreg) {
3520                 spin_lock(&pr_tmpl->registration_lock);
3521                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3522                 spin_unlock(&pr_tmpl->registration_lock);
3523         } else
3524                 core_scsi3_put_pr_reg(pr_reg);
3525
3526         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3527
3528         core_scsi3_put_pr_reg(dest_pr_reg);
3529         return 0;
3530 out:
3531         if (buf)
3532                 transport_kunmap_data_sg(cmd);
3533         if (dest_se_deve)
3534                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3535         if (dest_node_acl)
3536                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3537         core_scsi3_tpg_undepend_item(dest_se_tpg);
3538
3539 out_put_pr_reg:
3540         core_scsi3_put_pr_reg(pr_reg);
3541         return ret;
3542 }
3543
3544 static sense_reason_t
3545 target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key,
3546                      u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt)
3547 {
3548         struct exec_cmd_ops *ops = cmd->protocol_data;
3549
3550         if (!cmd->se_sess || !cmd->se_lun) {
3551                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3552                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3553         }
3554
3555         if (!ops->execute_pr_out) {
3556                 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
3557                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3558         }
3559
3560         switch (sa) {
3561         case PRO_REGISTER_AND_MOVE:
3562         case PRO_REPLACE_LOST_RESERVATION:
3563                 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n");
3564                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3565         }
3566
3567         if (spec_i_pt || all_tg_pt) {
3568                 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n");
3569                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3570         }
3571
3572         return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl);
3573 }
3574
3575 /*
3576  * See spc4r17 section 6.14 Table 170
3577  */
3578 sense_reason_t
3579 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3580 {
3581         struct se_device *dev = cmd->se_dev;
3582         unsigned char *cdb = &cmd->t_task_cdb[0];
3583         unsigned char *buf;
3584         u64 res_key, sa_res_key;
3585         int sa, scope, type, aptpl;
3586         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3587         sense_reason_t ret;
3588
3589         /*
3590          * Following spc2r20 5.5.1 Reservations overview:
3591          *
3592          * If a logical unit has been reserved by any RESERVE command and is
3593          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3594          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3595          * initiator or service action and shall terminate with a RESERVATION
3596          * CONFLICT status.
3597          */
3598         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3599                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3600                         " SPC-2 reservation is held, returning"
3601                         " RESERVATION_CONFLICT\n");
3602                 return TCM_RESERVATION_CONFLICT;
3603         }
3604
3605         /*
3606          * FIXME: A NULL struct se_session pointer means an this is not coming from
3607          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3608          */
3609         if (!cmd->se_sess)
3610                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3611
3612         if (cmd->data_length < 24) {
3613                 pr_warn("SPC-PR: Received PR OUT parameter list"
3614                         " length too small: %u\n", cmd->data_length);
3615                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3616         }
3617
3618         /*
3619          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3620          */
3621         sa = (cdb[1] & 0x1f);
3622         scope = (cdb[2] & 0xf0);
3623         type = (cdb[2] & 0x0f);
3624
3625         buf = transport_kmap_data_sg(cmd);
3626         if (!buf)
3627                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3628
3629         /*
3630          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3631          */
3632         res_key = get_unaligned_be64(&buf[0]);
3633         sa_res_key = get_unaligned_be64(&buf[8]);
3634         /*
3635          * REGISTER_AND_MOVE uses a different SA parameter list containing
3636          * SCSI TransportIDs.
3637          */
3638         if (sa != PRO_REGISTER_AND_MOVE) {
3639                 spec_i_pt = (buf[20] & 0x08);
3640                 all_tg_pt = (buf[20] & 0x04);
3641                 aptpl = (buf[20] & 0x01);
3642         } else {
3643                 aptpl = (buf[17] & 0x01);
3644                 unreg = (buf[17] & 0x02);
3645         }
3646         /*
3647          * If the backend device has been configured to force APTPL metadata
3648          * write-out, go ahead and propigate aptpl=1 down now.
3649          */
3650         if (dev->dev_attrib.force_pr_aptpl)
3651                 aptpl = 1;
3652
3653         transport_kunmap_data_sg(cmd);
3654         buf = NULL;
3655
3656         /*
3657          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3658          */
3659         if (spec_i_pt && (sa != PRO_REGISTER))
3660                 return TCM_INVALID_PARAMETER_LIST;
3661
3662         /*
3663          * From spc4r17 section 6.14:
3664          *
3665          * If the SPEC_I_PT bit is set to zero, the service action is not
3666          * REGISTER AND MOVE, and the parameter list length is not 24, then
3667          * the command shall be terminated with CHECK CONDITION status, with
3668          * the sense key set to ILLEGAL REQUEST, and the additional sense
3669          * code set to PARAMETER LIST LENGTH ERROR.
3670          */
3671         if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
3672             (cmd->data_length != 24)) {
3673                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3674                         " list length: %u\n", cmd->data_length);
3675                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3676         }
3677
3678         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
3679                 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type,
3680                                            aptpl, all_tg_pt, spec_i_pt);
3681                 goto done;
3682         }
3683
3684         /*
3685          * (core_scsi3_emulate_pro_* function parameters
3686          * are defined by spc4r17 Table 174:
3687          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3688          */
3689         switch (sa) {
3690         case PRO_REGISTER:
3691                 ret = core_scsi3_emulate_pro_register(cmd,
3692                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3693                 break;
3694         case PRO_RESERVE:
3695                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3696                 break;
3697         case PRO_RELEASE:
3698                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3699                 break;
3700         case PRO_CLEAR:
3701                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3702                 break;
3703         case PRO_PREEMPT:
3704                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3705                                         res_key, sa_res_key, PREEMPT);
3706                 break;
3707         case PRO_PREEMPT_AND_ABORT:
3708                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3709                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3710                 break;
3711         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3712                 ret = core_scsi3_emulate_pro_register(cmd,
3713                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3714                 break;
3715         case PRO_REGISTER_AND_MOVE:
3716                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3717                                 sa_res_key, aptpl, unreg);
3718                 break;
3719         default:
3720                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3721                         " action: 0x%02x\n", sa);
3722                 return TCM_INVALID_CDB_FIELD;
3723         }
3724
3725 done:
3726         if (!ret)
3727                 target_complete_cmd(cmd, SAM_STAT_GOOD);
3728         return ret;
3729 }
3730
3731 /*
3732  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3733  *
3734  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3735  */
3736 static sense_reason_t
3737 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3738 {
3739         struct se_device *dev = cmd->se_dev;
3740         struct t10_pr_registration *pr_reg;
3741         unsigned char *buf;
3742         u32 add_len = 0, off = 8;
3743
3744         if (cmd->data_length < 8) {
3745                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3746                         " too small\n", cmd->data_length);
3747                 return TCM_INVALID_CDB_FIELD;
3748         }
3749
3750         buf = transport_kmap_data_sg(cmd);
3751         if (!buf)
3752                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3753
3754         put_unaligned_be32(dev->t10_pr.pr_generation, buf);
3755
3756         spin_lock(&dev->t10_pr.registration_lock);
3757         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3758                         pr_reg_list) {
3759                 /*
3760                  * Check for overflow of 8byte PRI READ_KEYS payload and
3761                  * next reservation key list descriptor.
3762                  */
3763                 if (off + 8 <= cmd->data_length) {
3764                         put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3765                         off += 8;
3766                 }
3767                 /*
3768                  * SPC5r17: 6.16.2 READ KEYS service action
3769                  * The ADDITIONAL LENGTH field indicates the number of bytes in
3770                  * the Reservation key list. The contents of the ADDITIONAL
3771                  * LENGTH field are not altered based on the allocation length
3772                  */
3773                 add_len += 8;
3774         }
3775         spin_unlock(&dev->t10_pr.registration_lock);
3776
3777         put_unaligned_be32(add_len, &buf[4]);
3778         target_set_cmd_data_length(cmd, 8 + add_len);
3779
3780         transport_kunmap_data_sg(cmd);
3781
3782         return 0;
3783 }
3784
3785 /*
3786  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3787  *
3788  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3789  */
3790 static sense_reason_t
3791 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3792 {
3793         struct se_device *dev = cmd->se_dev;
3794         struct t10_pr_registration *pr_reg;
3795         unsigned char *buf;
3796         u64 pr_res_key;
3797         u32 add_len = 0;
3798
3799         if (cmd->data_length < 8) {
3800                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3801                         " too small\n", cmd->data_length);
3802                 return TCM_INVALID_CDB_FIELD;
3803         }
3804
3805         buf = transport_kmap_data_sg(cmd);
3806         if (!buf)
3807                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3808
3809         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3810
3811         spin_lock(&dev->dev_reservation_lock);
3812         pr_reg = dev->dev_pr_res_holder;
3813         if (pr_reg) {
3814                 /*
3815                  * Set the Additional Length to 16 when a reservation is held
3816                  */
3817                 add_len = 16;
3818                 put_unaligned_be32(add_len, &buf[4]);
3819
3820                 if (cmd->data_length < 22)
3821                         goto err;
3822
3823                 /*
3824                  * Set the Reservation key.
3825                  *
3826                  * From spc4r17, section 5.7.10:
3827                  * A persistent reservation holder has its reservation key
3828                  * returned in the parameter data from a PERSISTENT
3829                  * RESERVE IN command with READ RESERVATION service action as
3830                  * follows:
3831                  * a) For a persistent reservation of the type Write Exclusive
3832                  *    - All Registrants or Exclusive Access  All Regitrants,
3833                  *      the reservation key shall be set to zero; or
3834                  * b) For all other persistent reservation types, the
3835                  *    reservation key shall be set to the registered
3836                  *    reservation key for the I_T nexus that holds the
3837                  *    persistent reservation.
3838                  */
3839                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3840                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3841                         pr_res_key = 0;
3842                 else
3843                         pr_res_key = pr_reg->pr_res_key;
3844
3845                 put_unaligned_be64(pr_res_key, &buf[8]);
3846                 /*
3847                  * Set the SCOPE and TYPE
3848                  */
3849                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3850                           (pr_reg->pr_res_type & 0x0f);
3851         }
3852
3853         target_set_cmd_data_length(cmd, 8 + add_len);
3854
3855 err:
3856         spin_unlock(&dev->dev_reservation_lock);
3857         transport_kunmap_data_sg(cmd);
3858
3859         return 0;
3860 }
3861
3862 /*
3863  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3864  *
3865  * See spc4r17 section 6.13.4 Table 165
3866  */
3867 static sense_reason_t
3868 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3869 {
3870         struct se_device *dev = cmd->se_dev;
3871         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3872         unsigned char *buf;
3873         u16 len = 8; /* Hardcoded to 8. */
3874
3875         if (cmd->data_length < 6) {
3876                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3877                         " %u too small\n", cmd->data_length);
3878                 return TCM_INVALID_CDB_FIELD;
3879         }
3880
3881         buf = transport_kmap_data_sg(cmd);
3882         if (!buf)
3883                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3884
3885         put_unaligned_be16(len, &buf[0]);
3886         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3887         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3888         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3889         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3890         /*
3891          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3892          * set the TMV: Task Mask Valid bit.
3893          */
3894         buf[3] |= 0x80;
3895         /*
3896          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3897          */
3898         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3899         /*
3900          * PTPL_A: Persistence across Target Power Loss Active bit
3901          */
3902         if (pr_tmpl->pr_aptpl_active)
3903                 buf[3] |= 0x01;
3904         /*
3905          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3906          */
3907         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3908         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3909         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3910         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3911         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3912         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3913
3914         target_set_cmd_data_length(cmd, len);
3915
3916         transport_kunmap_data_sg(cmd);
3917
3918         return 0;
3919 }
3920
3921 /*
3922  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3923  *
3924  * See spc4r17 section 6.13.5 Table 168 and 169
3925  */
3926 static sense_reason_t
3927 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3928 {
3929         struct se_device *dev = cmd->se_dev;
3930         struct se_node_acl *se_nacl;
3931         struct se_portal_group *se_tpg;
3932         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3933         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3934         unsigned char *buf;
3935         u32 add_desc_len = 0, add_len = 0;
3936         u32 off = 8; /* off into first Full Status descriptor */
3937         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3938         int exp_desc_len, desc_len;
3939         bool all_reg = false;
3940
3941         if (cmd->data_length < 8) {
3942                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3943                         " too small\n", cmd->data_length);
3944                 return TCM_INVALID_CDB_FIELD;
3945         }
3946
3947         buf = transport_kmap_data_sg(cmd);
3948         if (!buf)
3949                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3950
3951         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3952
3953         spin_lock(&dev->dev_reservation_lock);
3954         if (dev->dev_pr_res_holder) {
3955                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3956
3957                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3958                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3959                         all_reg = true;
3960                         pr_res_type = pr_holder->pr_res_type;
3961                         pr_res_scope = pr_holder->pr_res_scope;
3962                 }
3963         }
3964         spin_unlock(&dev->dev_reservation_lock);
3965
3966         spin_lock(&pr_tmpl->registration_lock);
3967         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3968                         &pr_tmpl->registration_list, pr_reg_list) {
3969
3970                 se_nacl = pr_reg->pr_reg_nacl;
3971                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3972                 add_desc_len = 0;
3973
3974                 atomic_inc_mb(&pr_reg->pr_res_holders);
3975                 spin_unlock(&pr_tmpl->registration_lock);
3976                 /*
3977                  * Determine expected length of $FABRIC_MOD specific
3978                  * TransportID full status descriptor..
3979                  */
3980                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3981                                         &format_code);
3982                 if (exp_desc_len < 0 ||
3983                     exp_desc_len + add_len > cmd->data_length) {
3984                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3985                                 " out of buffer: %d\n", cmd->data_length);
3986                         spin_lock(&pr_tmpl->registration_lock);
3987                         atomic_dec_mb(&pr_reg->pr_res_holders);
3988                         break;
3989                 }
3990                 /*
3991                  * Set RESERVATION KEY
3992                  */
3993                 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3994                 off += 8;
3995                 off += 4; /* Skip Over Reserved area */
3996
3997                 /*
3998                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3999                  */
4000                 if (pr_reg->pr_reg_all_tg_pt)
4001                         buf[off] = 0x02;
4002                 /*
4003                  * The struct se_lun pointer will be present for the
4004                  * reservation holder for PR_HOLDER bit.
4005                  *
4006                  * Also, if this registration is the reservation
4007                  * holder or there is an All Registrants reservation
4008                  * active, fill in SCOPE and TYPE in the next byte.
4009                  */
4010                 if (pr_reg->pr_res_holder) {
4011                         buf[off++] |= 0x01;
4012                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4013                                      (pr_reg->pr_res_type & 0x0f);
4014                 } else if (all_reg) {
4015                         buf[off++] |= 0x01;
4016                         buf[off++] = (pr_res_scope & 0xf0) |
4017                                      (pr_res_type & 0x0f);
4018                 } else {
4019                         off += 2;
4020                 }
4021
4022                 off += 4; /* Skip over reserved area */
4023                 /*
4024                  * From spc4r17 6.3.15:
4025                  *
4026                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4027                  * IDENTIFIER field contains the relative port identifier (see
4028                  * 3.1.120) of the target port that is part of the I_T nexus
4029                  * described by this full status descriptor. If the ALL_TG_PT
4030                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4031                  * IDENTIFIER field are not defined by this standard.
4032                  */
4033                 if (!pr_reg->pr_reg_all_tg_pt) {
4034                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
4035
4036                         put_unaligned_be16(sep_rtpi, &buf[off]);
4037                         off += 2;
4038                 } else
4039                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4040
4041                 buf[off+4] = se_tpg->proto_id;
4042
4043                 /*
4044                  * Now, have the $FABRIC_MOD fill in the transport ID.
4045                  */
4046                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4047                                 &format_code, &buf[off+4]);
4048
4049                 spin_lock(&pr_tmpl->registration_lock);
4050                 atomic_dec_mb(&pr_reg->pr_res_holders);
4051
4052                 if (desc_len < 0)
4053                         break;
4054                 /*
4055                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4056                  */
4057                 put_unaligned_be32(desc_len, &buf[off]);
4058                 off += 4;
4059                 /*
4060                  * Size of full desctipor header minus TransportID
4061                  * containing $FABRIC_MOD specific) initiator device/port
4062                  * WWN information.
4063                  *
4064                  *  See spc4r17 Section 6.13.5 Table 169
4065                  */
4066                 add_desc_len = (24 + desc_len);
4067
4068                 off += desc_len;
4069                 add_len += add_desc_len;
4070         }
4071         spin_unlock(&pr_tmpl->registration_lock);
4072         /*
4073          * Set ADDITIONAL_LENGTH
4074          */
4075         put_unaligned_be32(add_len, &buf[4]);
4076         target_set_cmd_data_length(cmd, 8 + add_len);
4077
4078         transport_kunmap_data_sg(cmd);
4079
4080         return 0;
4081 }
4082
4083 static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa)
4084 {
4085         struct exec_cmd_ops *ops = cmd->protocol_data;
4086         unsigned char *buf;
4087         sense_reason_t ret;
4088
4089         if (cmd->data_length < 8) {
4090                 pr_err("PRIN SA SCSI Data Length: %u too small\n",
4091                        cmd->data_length);
4092                 return TCM_INVALID_CDB_FIELD;
4093         }
4094
4095         if (!ops->execute_pr_in) {
4096                 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
4097                 return TCM_UNSUPPORTED_SCSI_OPCODE;
4098         }
4099
4100         if (sa == PRI_READ_FULL_STATUS) {
4101                 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n");
4102                 return TCM_UNSUPPORTED_SCSI_OPCODE;
4103         }
4104
4105         buf = transport_kmap_data_sg(cmd);
4106         if (!buf)
4107                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4108
4109         ret = ops->execute_pr_in(cmd, sa, buf);
4110
4111         transport_kunmap_data_sg(cmd);
4112         return ret;
4113 }
4114
4115 sense_reason_t
4116 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4117 {
4118         u8 sa = cmd->t_task_cdb[1] & 0x1f;
4119         sense_reason_t ret;
4120
4121         /*
4122          * Following spc2r20 5.5.1 Reservations overview:
4123          *
4124          * If a logical unit has been reserved by any RESERVE command and is
4125          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4126          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4127          * initiator or service action and shall terminate with a RESERVATION
4128          * CONFLICT status.
4129          */
4130         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4131                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4132                         " SPC-2 reservation is held, returning"
4133                         " RESERVATION_CONFLICT\n");
4134                 return TCM_RESERVATION_CONFLICT;
4135         }
4136
4137         if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
4138                 ret = target_try_pr_in_pt(cmd, sa);
4139                 goto done;
4140         }
4141
4142         switch (sa) {
4143         case PRI_READ_KEYS:
4144                 ret = core_scsi3_pri_read_keys(cmd);
4145                 break;
4146         case PRI_READ_RESERVATION:
4147                 ret = core_scsi3_pri_read_reservation(cmd);
4148                 break;
4149         case PRI_REPORT_CAPABILITIES:
4150                 ret = core_scsi3_pri_report_capabilities(cmd);
4151                 break;
4152         case PRI_READ_FULL_STATUS:
4153                 ret = core_scsi3_pri_read_full_status(cmd);
4154                 break;
4155         default:
4156                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4157                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4158                 return TCM_INVALID_CDB_FIELD;
4159         }
4160
4161 done:
4162         if (!ret)
4163                 target_complete_cmd(cmd, SAM_STAT_GOOD);
4164         return ret;
4165 }
4166
4167 sense_reason_t
4168 target_check_reservation(struct se_cmd *cmd)
4169 {
4170         struct se_device *dev = cmd->se_dev;
4171         sense_reason_t ret;
4172
4173         if (!cmd->se_sess)
4174                 return 0;
4175         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4176                 return 0;
4177         if (!dev->dev_attrib.emulate_pr)
4178                 return 0;
4179         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
4180                 return 0;
4181
4182         spin_lock(&dev->dev_reservation_lock);
4183         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4184                 ret = target_scsi2_reservation_check(cmd);
4185         else
4186                 ret = target_scsi3_pr_reservation_check(cmd);
4187         spin_unlock(&dev->dev_reservation_lock);
4188
4189         return ret;
4190 }