drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * (c) Copyright 2009-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/file.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/fs.h>
  34 #include <scsi/scsi_proto.h>
  35 #include <asm/unaligned.h>
  36
  37 #include <target/target_core_base.h>
  38 #include <target/target_core_backend.h>
  39 #include <target/target_core_fabric.h>
  40
  41 #include "target_core_internal.h"
  42 #include "target_core_pr.h"
  43 #include "target_core_ua.h"
  44
  45 /*
  46  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  47  */
  48 struct pr_transport_id_holder {
  49         struct t10_pr_registration *dest_pr_reg;
  50         struct se_portal_group *dest_tpg;
  51         struct se_node_acl *dest_node_acl;
  52         struct se_dev_entry *dest_se_deve;
  53         struct list_head dest_list;
  54 };
  55
  56 void core_pr_dump_initiator_port(
  57         struct t10_pr_registration *pr_reg,
  58         char *buf,
  59         u32 size)
  60 {
  61         if (!pr_reg->isid_present_at_reg) {
  62                 buf[0] = '\0';
  63                 return;
  64         }
  65
  66         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  67 }
  68
  69 enum register_type {
  70         REGISTER,
  71         REGISTER_AND_IGNORE_EXISTING_KEY,
  72         REGISTER_AND_MOVE,
  73 };
  74
  75 enum preempt_type {
  76         PREEMPT,
  77         PREEMPT_AND_ABORT,
  78 };
  79
  80 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  81                                               struct t10_pr_registration *, int, int);
  82
  83 static int is_reservation_holder(
  84         struct t10_pr_registration *pr_res_holder,
  85         struct t10_pr_registration *pr_reg)
  86 {
  87         int pr_res_type;
  88
  89         if (pr_res_holder) {
  90                 pr_res_type = pr_res_holder->pr_res_type;
  91
  92                 return pr_res_holder == pr_reg ||
  93                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  94                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  95         }
  96         return 0;
  97 }
  98
  99 static sense_reason_t
 100 target_scsi2_reservation_check(struct se_cmd *cmd)
 101 {
 102         struct se_device *dev = cmd->se_dev;
 103         struct se_session *sess = cmd->se_sess;
 104
 105         switch (cmd->t_task_cdb[0]) {
 106         case INQUIRY:
 107         case RELEASE:
 108         case RELEASE_10:
 109                 return 0;
 110         default:
 111                 break;
 112         }
 113
 114         if (!dev->dev_reserved_node_acl || !sess)
 115                 return 0;
 116
 117         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 118                 return TCM_RESERVATION_CONFLICT;
 119
 120         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 121                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 122                         return TCM_RESERVATION_CONFLICT;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 129                                         struct se_node_acl *, struct se_session *);
 130 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 131
 132 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 133 {
 134         struct se_session *se_sess = cmd->se_sess;
 135         struct se_device *dev = cmd->se_dev;
 136         struct t10_pr_registration *pr_reg;
 137         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 138         int conflict = 0;
 139
 140         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 141                         se_sess);
 142         if (pr_reg) {
 143                 /*
 144                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 145                  * behavior
 146                  *
 147                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 148                  * status, but no reservation shall be established and the
 149                  * persistent reservation shall not be changed, if the command
 150                  * is received from a) and b) below.
 151                  *
 152                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 153                  * status, but the persistent reservation shall not be released,
 154                  * if the command is received from a) and b)
 155                  *
 156                  * a) An I_T nexus that is a persistent reservation holder; or
 157                  * b) An I_T nexus that is registered if a registrants only or
 158                  *    all registrants type persistent reservation is present.
 159                  *
 160                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 161                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 162                  * as defined in SPC-2.
 163                  */
 164                 if (pr_reg->pr_res_holder) {
 165                         core_scsi3_put_pr_reg(pr_reg);
 166                         return 1;
 167                 }
 168                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 169                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 170                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 171                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 172                         core_scsi3_put_pr_reg(pr_reg);
 173                         return 1;
 174                 }
 175                 core_scsi3_put_pr_reg(pr_reg);
 176                 conflict = 1;
 177         } else {
 178                 /*
 179                  * Following spc2r20 5.5.1 Reservations overview:
 180                  *
 181                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 182                  * command with the REGISTER or the REGISTER AND IGNORE
 183                  * EXISTING KEY service action and is still registered by any
 184                  * initiator, all RESERVE commands and all RELEASE commands
 185                  * regardless of initiator shall conflict and shall terminate
 186                  * with a RESERVATION CONFLICT status.
 187                  */
 188                 spin_lock(&pr_tmpl->registration_lock);
 189                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 190                 spin_unlock(&pr_tmpl->registration_lock);
 191         }
 192
 193         if (conflict) {
 194                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 195                         " while active SPC-3 registrations exist,"
 196                         " returning RESERVATION_CONFLICT\n");
 197                 return -EBUSY;
 198         }
 199
 200         return 0;
 201 }
 202
 203 sense_reason_t
 204 target_scsi2_reservation_release(struct se_cmd *cmd)
 205 {
 206         struct se_device *dev = cmd->se_dev;
 207         struct se_session *sess = cmd->se_sess;
 208         struct se_portal_group *tpg;
 209         int rc;
 210
 211         if (!sess || !sess->se_tpg)
 212                 goto out;
 213         rc = target_check_scsi2_reservation_conflict(cmd);
 214         if (rc == 1)
 215                 goto out;
 216         if (rc < 0)
 217                 return TCM_RESERVATION_CONFLICT;
 218
 219         spin_lock(&dev->dev_reservation_lock);
 220         if (!dev->dev_reserved_node_acl || !sess)
 221                 goto out_unlock;
 222
 223         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 224                 goto out_unlock;
 225
 226         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 227                 goto out_unlock;
 228
 229         dev->dev_reserved_node_acl = NULL;
 230         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 231         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 232                 dev->dev_res_bin_isid = 0;
 233                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 234         }
 235         tpg = sess->se_tpg;
 236         pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
 237                 " MAPPED LUN: %llu for %s\n",
 238                 tpg->se_tpg_tfo->get_fabric_name(),
 239                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 240                 sess->se_node_acl->initiatorname);
 241
 242 out_unlock:
 243         spin_unlock(&dev->dev_reservation_lock);
 244 out:
 245         target_complete_cmd(cmd, GOOD);
 246         return 0;
 247 }
 248
 249 sense_reason_t
 250 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 251 {
 252         struct se_device *dev = cmd->se_dev;
 253         struct se_session *sess = cmd->se_sess;
 254         struct se_portal_group *tpg;
 255         sense_reason_t ret = 0;
 256         int rc;
 257
 258         if ((cmd->t_task_cdb[1] & 0x01) &&
 259             (cmd->t_task_cdb[1] & 0x02)) {
 260                 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
 261                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 262         }
 263         /*
 264          * This is currently the case for target_core_mod passthrough struct se_cmd
 265          * ops
 266          */
 267         if (!sess || !sess->se_tpg)
 268                 goto out;
 269         rc = target_check_scsi2_reservation_conflict(cmd);
 270         if (rc == 1)
 271                 goto out;
 272
 273         if (rc < 0)
 274                 return TCM_RESERVATION_CONFLICT;
 275
 276         tpg = sess->se_tpg;
 277         spin_lock(&dev->dev_reservation_lock);
 278         if (dev->dev_reserved_node_acl &&
 279            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 280                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 281                         tpg->se_tpg_tfo->get_fabric_name());
 282                 pr_err("Original reserver LUN: %llu %s\n",
 283                         cmd->se_lun->unpacked_lun,
 284                         dev->dev_reserved_node_acl->initiatorname);
 285                 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
 286                         " from %s \n", cmd->se_lun->unpacked_lun,
 287                         cmd->orig_fe_lun,
 288                         sess->se_node_acl->initiatorname);
 289                 ret = TCM_RESERVATION_CONFLICT;
 290                 goto out_unlock;
 291         }
 292
 293         dev->dev_reserved_node_acl = sess->se_node_acl;
 294         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 295         if (sess->sess_bin_isid != 0) {
 296                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 297                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 298         }
 299         pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
 300                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 301                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 302                 sess->se_node_acl->initiatorname);
 303
 304 out_unlock:
 305         spin_unlock(&dev->dev_reservation_lock);
 306 out:
 307         if (!ret)
 308                 target_complete_cmd(cmd, GOOD);
 309         return ret;
 310 }
 311
 312
 313 /*
 314  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 315  *
 316  * This function is called by those initiator ports who are *NOT*
 317  * the active PR reservation holder when a reservation is present.
 318  */
 319 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 320                                         bool isid_mismatch)
 321 {
 322         unsigned char *cdb = cmd->t_task_cdb;
 323         struct se_session *se_sess = cmd->se_sess;
 324         struct se_node_acl *nacl = se_sess->se_node_acl;
 325         int other_cdb = 0;
 326         int registered_nexus = 0, ret = 1; /* Conflict by default */
 327         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 328         int we = 0; /* Write Exclusive */
 329         int legacy = 0; /* Act like a legacy device and return
 330                          * RESERVATION CONFLICT on some CDBs */
 331
 332         if (isid_mismatch) {
 333                 registered_nexus = 0;
 334         } else {
 335                 struct se_dev_entry *se_deve;
 336
 337                 rcu_read_lock();
 338                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 339                 if (se_deve)
 340                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 341                                                     &se_deve->deve_flags);
 342                 rcu_read_unlock();
 343         }
 344
 345         switch (pr_reg_type) {
 346         case PR_TYPE_WRITE_EXCLUSIVE:
 347                 we = 1;
 348         case PR_TYPE_EXCLUSIVE_ACCESS:
 349                 /*
 350                  * Some commands are only allowed for the persistent reservation
 351                  * holder.
 352                  */
 353                 break;
 354         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 355                 we = 1;
 356                 /* fall through */
 357         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 358                 /*
 359                  * Some commands are only allowed for registered I_T Nexuses.
 360                  */
 361                 reg_only = 1;
 362                 break;
 363         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 364                 we = 1;
 365                 /* fall through */
 366         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 367                 /*
 368                  * Each registered I_T Nexus is a reservation holder.
 369                  */
 370                 all_reg = 1;
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375         /*
 376          * Referenced from spc4r17 table 45 for *NON* PR holder access
 377          */
 378         switch (cdb[0]) {
 379         case SECURITY_PROTOCOL_IN:
 380                 if (registered_nexus)
 381                         return 0;
 382                 ret = (we) ? 0 : 1;
 383                 break;
 384         case MODE_SENSE:
 385         case MODE_SENSE_10:
 386         case READ_ATTRIBUTE:
 387         case READ_BUFFER:
 388         case RECEIVE_DIAGNOSTIC:
 389                 if (legacy) {
 390                         ret = 1;
 391                         break;
 392                 }
 393                 if (registered_nexus) {
 394                         ret = 0;
 395                         break;
 396                 }
 397                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 398                 break;
 399         case PERSISTENT_RESERVE_OUT:
 400                 /*
 401                  * This follows PERSISTENT_RESERVE_OUT service actions that
 402                  * are allowed in the presence of various reservations.
 403                  * See spc4r17, table 46
 404                  */
 405                 switch (cdb[1] & 0x1f) {
 406                 case PRO_CLEAR:
 407                 case PRO_PREEMPT:
 408                 case PRO_PREEMPT_AND_ABORT:
 409                         ret = (registered_nexus) ? 0 : 1;
 410                         break;
 411                 case PRO_REGISTER:
 412                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 413                         ret = 0;
 414                         break;
 415                 case PRO_REGISTER_AND_MOVE:
 416                 case PRO_RESERVE:
 417                         ret = 1;
 418                         break;
 419                 case PRO_RELEASE:
 420                         ret = (registered_nexus) ? 0 : 1;
 421                         break;
 422                 default:
 423                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 424                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 425                         return -EINVAL;
 426                 }
 427                 break;
 428         case RELEASE:
 429         case RELEASE_10:
 430                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 431                 ret = 0;
 432                 break;
 433         case RESERVE:
 434         case RESERVE_10:
 435                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 436                 ret = 0;
 437                 break;
 438         case TEST_UNIT_READY:
 439                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 440                 break;
 441         case MAINTENANCE_IN:
 442                 switch (cdb[1] & 0x1f) {
 443                 case MI_MANAGEMENT_PROTOCOL_IN:
 444                         if (registered_nexus) {
 445                                 ret = 0;
 446                                 break;
 447                         }
 448                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 449                         break;
 450                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 451                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 452                         if (legacy) {
 453                                 ret = 1;
 454                                 break;
 455                         }
 456                         if (registered_nexus) {
 457                                 ret = 0;
 458                                 break;
 459                         }
 460                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 461                         break;
 462                 case MI_REPORT_ALIASES:
 463                 case MI_REPORT_IDENTIFYING_INFORMATION:
 464                 case MI_REPORT_PRIORITY:
 465                 case MI_REPORT_TARGET_PGS:
 466                 case MI_REPORT_TIMESTAMP:
 467                         ret = 0; /* Allowed */
 468                         break;
 469                 default:
 470                         pr_err("Unknown MI Service Action: 0x%02x\n",
 471                                 (cdb[1] & 0x1f));
 472                         return -EINVAL;
 473                 }
 474                 break;
 475         case ACCESS_CONTROL_IN:
 476         case ACCESS_CONTROL_OUT:
 477         case INQUIRY:
 478         case LOG_SENSE:
 479         case SERVICE_ACTION_IN_12:
 480         case REPORT_LUNS:
 481         case REQUEST_SENSE:
 482         case PERSISTENT_RESERVE_IN:
 483                 ret = 0; /*/ Allowed CDBs */
 484                 break;
 485         default:
 486                 other_cdb = 1;
 487                 break;
 488         }
 489         /*
 490          * Case where the CDB is explicitly allowed in the above switch
 491          * statement.
 492          */
 493         if (!ret && !other_cdb) {
 494                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 495                         " reservation holder\n", cdb[0],
 496                         core_scsi3_pr_dump_type(pr_reg_type));
 497
 498                 return ret;
 499         }
 500         /*
 501          * Check if write exclusive initiator ports *NOT* holding the
 502          * WRITE_EXCLUSIVE_* reservation.
 503          */
 504         if (we && !registered_nexus) {
 505                 if (cmd->data_direction == DMA_TO_DEVICE) {
 506                         /*
 507                          * Conflict for write exclusive
 508                          */
 509                         pr_debug("%s Conflict for unregistered nexus"
 510                                 " %s CDB: 0x%02x to %s reservation\n",
 511                                 transport_dump_cmd_direction(cmd),
 512                                 se_sess->se_node_acl->initiatorname, cdb[0],
 513                                 core_scsi3_pr_dump_type(pr_reg_type));
 514                         return 1;
 515                 } else {
 516                         /*
 517                          * Allow non WRITE CDBs for all Write Exclusive
 518                          * PR TYPEs to pass for registered and
 519                          * non-registered_nexuxes NOT holding the reservation.
 520                          *
 521                          * We only make noise for the unregisterd nexuses,
 522                          * as we expect registered non-reservation holding
 523                          * nexuses to issue CDBs.
 524                          */
 525
 526                         if (!registered_nexus) {
 527                                 pr_debug("Allowing implicit CDB: 0x%02x"
 528                                         " for %s reservation on unregistered"
 529                                         " nexus\n", cdb[0],
 530                                         core_scsi3_pr_dump_type(pr_reg_type));
 531                         }
 532
 533                         return 0;
 534                 }
 535         } else if ((reg_only) || (all_reg)) {
 536                 if (registered_nexus) {
 537                         /*
 538                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 539                          * allow commands from registered nexuses.
 540                          */
 541
 542                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 543                                 " reservation\n", cdb[0],
 544                                 core_scsi3_pr_dump_type(pr_reg_type));
 545
 546                         return 0;
 547                 }
 548        } else if (we && registered_nexus) {
 549                /*
 550                 * Reads are allowed for Write Exclusive locks
 551                 * from all registrants.
 552                 */
 553                if (cmd->data_direction == DMA_FROM_DEVICE) {
 554                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 555                                " reservation\n", cdb[0],
 556                                core_scsi3_pr_dump_type(pr_reg_type));
 557
 558                        return 0;
 559                }
 560         }
 561         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 562                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 563                 (registered_nexus) ? "" : "un",
 564                 se_sess->se_node_acl->initiatorname, cdb[0],
 565                 core_scsi3_pr_dump_type(pr_reg_type));
 566
 567         return 1; /* Conflict by default */
 568 }
 569
 570 static sense_reason_t
 571 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 572 {
 573         struct se_device *dev = cmd->se_dev;
 574         struct se_session *sess = cmd->se_sess;
 575         u32 pr_reg_type;
 576         bool isid_mismatch = false;
 577
 578         if (!dev->dev_pr_res_holder)
 579                 return 0;
 580
 581         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 582         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 583         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 584                 goto check_nonholder;
 585
 586         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 587                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 588                     sess->sess_bin_isid) {
 589                         isid_mismatch = true;
 590                         goto check_nonholder;
 591                 }
 592         }
 593
 594         return 0;
 595
 596 check_nonholder:
 597         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 598                 return TCM_RESERVATION_CONFLICT;
 599         return 0;
 600 }
 601
 602 static u32 core_scsi3_pr_generation(struct se_device *dev)
 603 {
 604         u32 prg;
 605
 606         /*
 607          * PRGeneration field shall contain the value of a 32-bit wrapping
 608          * counter mainted by the device server.
 609          *
 610          * Note that this is done regardless of Active Persist across
 611          * Target PowerLoss (APTPL)
 612          *
 613          * See spc4r17 section 6.3.12 READ_KEYS service action
 614          */
 615         spin_lock(&dev->dev_reservation_lock);
 616         prg = dev->t10_pr.pr_generation++;
 617         spin_unlock(&dev->dev_reservation_lock);
 618
 619         return prg;
 620 }
 621
 622 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 623         struct se_device *dev,
 624         struct se_node_acl *nacl,
 625         struct se_lun *lun,
 626         struct se_dev_entry *dest_deve,
 627         u64 mapped_lun,
 628         unsigned char *isid,
 629         u64 sa_res_key,
 630         int all_tg_pt,
 631         int aptpl)
 632 {
 633         struct t10_pr_registration *pr_reg;
 634
 635         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 636         if (!pr_reg) {
 637                 pr_err("Unable to allocate struct t10_pr_registration\n");
 638                 return NULL;
 639         }
 640
 641         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 642         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 643         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 644         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 645         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 646         atomic_set(&pr_reg->pr_res_holders, 0);
 647         pr_reg->pr_reg_nacl = nacl;
 648         /*
 649          * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
 650          * the se_dev_entry->pr_ref will have been already obtained by
 651          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 652          *
 653          * Otherwise, locate se_dev_entry now and obtain a reference until
 654          * registration completes in __core_scsi3_add_registration().
 655          */
 656         if (dest_deve) {
 657                 pr_reg->pr_reg_deve = dest_deve;
 658         } else {
 659                 rcu_read_lock();
 660                 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 661                 if (!pr_reg->pr_reg_deve) {
 662                         rcu_read_unlock();
 663                         pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
 664                                 nacl->initiatorname, mapped_lun);
 665                         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 666                         return NULL;
 667                 }
 668                 kref_get(&pr_reg->pr_reg_deve->pr_kref);
 669                 rcu_read_unlock();
 670         }
 671         pr_reg->pr_res_mapped_lun = mapped_lun;
 672         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 673         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 674         pr_reg->pr_res_key = sa_res_key;
 675         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 676         pr_reg->pr_reg_aptpl = aptpl;
 677         /*
 678          * If an ISID value for this SCSI Initiator Port exists,
 679          * save it to the registration now.
 680          */
 681         if (isid != NULL) {
 682                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 683                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 684                 pr_reg->isid_present_at_reg = 1;
 685         }
 686
 687         return pr_reg;
 688 }
 689
 690 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 691 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 692
 693 /*
 694  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 695  * modes.
 696  */
 697 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 698         struct se_device *dev,
 699         struct se_node_acl *nacl,
 700         struct se_lun *lun,
 701         struct se_dev_entry *deve,
 702         u64 mapped_lun,
 703         unsigned char *isid,
 704         u64 sa_res_key,
 705         int all_tg_pt,
 706         int aptpl)
 707 {
 708         struct se_dev_entry *deve_tmp;
 709         struct se_node_acl *nacl_tmp;
 710         struct se_lun_acl *lacl_tmp;
 711         struct se_lun *lun_tmp, *next, *dest_lun;
 712         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 713         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 714         int ret;
 715         /*
 716          * Create a registration for the I_T Nexus upon which the
 717          * PROUT REGISTER was received.
 718          */
 719         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 720                                                     isid, sa_res_key, all_tg_pt,
 721                                                     aptpl);
 722         if (!pr_reg)
 723                 return NULL;
 724         /*
 725          * Return pointer to pr_reg for ALL_TG_PT=0
 726          */
 727         if (!all_tg_pt)
 728                 return pr_reg;
 729         /*
 730          * Create list of matching SCSI Initiator Port registrations
 731          * for ALL_TG_PT=1
 732          */
 733         spin_lock(&dev->se_port_lock);
 734         list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
 735                 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
 736                         continue;
 737                 spin_unlock(&dev->se_port_lock);
 738
 739                 spin_lock(&lun_tmp->lun_deve_lock);
 740                 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 741                         /*
 742                          * This pointer will be NULL for demo mode MappedLUNs
 743                          * that have not been make explicit via a ConfigFS
 744                          * MappedLUN group for the SCSI Initiator Node ACL.
 745                          */
 746                         if (!deve_tmp->se_lun_acl)
 747                                 continue;
 748
 749                         lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
 750                                                 lockdep_is_held(&lun_tmp->lun_deve_lock));
 751                         nacl_tmp = lacl_tmp->se_lun_nacl;
 752                         /*
 753                          * Skip the matching struct se_node_acl that is allocated
 754                          * above..
 755                          */
 756                         if (nacl == nacl_tmp)
 757                                 continue;
 758                         /*
 759                          * Only perform PR registrations for target ports on
 760                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 761                          * arrived.
 762                          */
 763                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 764                                 continue;
 765                         /*
 766                          * Look for a matching Initiator Node ACL in ASCII format
 767                          */
 768                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 769                                 continue;
 770
 771                         kref_get(&deve_tmp->pr_kref);
 772                         spin_unlock(&lun_tmp->lun_deve_lock);
 773                         /*
 774                          * Grab a configfs group dependency that is released
 775                          * for the exception path at label out: below, or upon
 776                          * completion of adding ALL_TG_PT=1 registrations in
 777                          * __core_scsi3_add_registration()
 778                          */
 779                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 780                         if (ret < 0) {
 781                                 pr_err("core_scsi3_lunacl_depend"
 782                                                 "_item() failed\n");
 783                                 percpu_ref_put(&lun_tmp->lun_ref);
 784                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 785                                 goto out;
 786                         }
 787                         /*
 788                          * Located a matching SCSI Initiator Port on a different
 789                          * port, allocate the pr_reg_atp and attach it to the
 790                          * pr_reg->pr_reg_atp_list that will be processed once
 791                          * the original *pr_reg is processed in
 792                          * __core_scsi3_add_registration()
 793                          */
 794                         dest_lun = rcu_dereference_check(deve_tmp->se_lun,
 795                                 kref_read(&deve_tmp->pr_kref) != 0);
 796
 797                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 798                                                 nacl_tmp, dest_lun, deve_tmp,
 799                                                 deve_tmp->mapped_lun, NULL,
 800                                                 sa_res_key, all_tg_pt, aptpl);
 801                         if (!pr_reg_atp) {
 802                                 percpu_ref_put(&lun_tmp->lun_ref);
 803                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 804                                 goto out;
 805                         }
 806
 807                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 808                                       &pr_reg->pr_reg_atp_list);
 809                         spin_lock(&lun_tmp->lun_deve_lock);
 810                 }
 811                 spin_unlock(&lun_tmp->lun_deve_lock);
 812
 813                 spin_lock(&dev->se_port_lock);
 814                 percpu_ref_put(&lun_tmp->lun_ref);
 815         }
 816         spin_unlock(&dev->se_port_lock);
 817
 818         return pr_reg;
 819 out:
 820         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 821                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 822                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 823                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 824                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 825         }
 826         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 827         return NULL;
 828 }
 829
 830 int core_scsi3_alloc_aptpl_registration(
 831         struct t10_reservation *pr_tmpl,
 832         u64 sa_res_key,
 833         unsigned char *i_port,
 834         unsigned char *isid,
 835         u64 mapped_lun,
 836         unsigned char *t_port,
 837         u16 tpgt,
 838         u64 target_lun,
 839         int res_holder,
 840         int all_tg_pt,
 841         u8 type)
 842 {
 843         struct t10_pr_registration *pr_reg;
 844
 845         if (!i_port || !t_port || !sa_res_key) {
 846                 pr_err("Illegal parameters for APTPL registration\n");
 847                 return -EINVAL;
 848         }
 849
 850         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 851         if (!pr_reg) {
 852                 pr_err("Unable to allocate struct t10_pr_registration\n");
 853                 return -ENOMEM;
 854         }
 855
 856         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 857         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 858         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 859         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 860         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 861         atomic_set(&pr_reg->pr_res_holders, 0);
 862         pr_reg->pr_reg_nacl = NULL;
 863         pr_reg->pr_reg_deve = NULL;
 864         pr_reg->pr_res_mapped_lun = mapped_lun;
 865         pr_reg->pr_aptpl_target_lun = target_lun;
 866         pr_reg->pr_res_key = sa_res_key;
 867         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 868         pr_reg->pr_reg_aptpl = 1;
 869         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 870         pr_reg->pr_res_type = type;
 871         /*
 872          * If an ISID value had been saved in APTPL metadata for this
 873          * SCSI Initiator Port, restore it now.
 874          */
 875         if (isid != NULL) {
 876                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 877                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 878                 pr_reg->isid_present_at_reg = 1;
 879         }
 880         /*
 881          * Copy the i_port and t_port information from caller.
 882          */
 883         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 884         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 885         pr_reg->pr_reg_tpgt = tpgt;
 886         /*
 887          * Set pr_res_holder from caller, the pr_reg who is the reservation
 888          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 889          * the Initiator Node LUN ACL from the fabric module is created for
 890          * this registration.
 891          */
 892         pr_reg->pr_res_holder = res_holder;
 893
 894         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 895         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 896                         " metadata\n", (res_holder) ? "+reservation" : "");
 897         return 0;
 898 }
 899
 900 static void core_scsi3_aptpl_reserve(
 901         struct se_device *dev,
 902         struct se_portal_group *tpg,
 903         struct se_node_acl *node_acl,
 904         struct t10_pr_registration *pr_reg)
 905 {
 906         char i_buf[PR_REG_ISID_ID_LEN];
 907
 908         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 909         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 910
 911         spin_lock(&dev->dev_reservation_lock);
 912         dev->dev_pr_res_holder = pr_reg;
 913         spin_unlock(&dev->dev_reservation_lock);
 914
 915         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 916                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 917                 tpg->se_tpg_tfo->get_fabric_name(),
 918                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 919                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 920         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 921                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 922                 i_buf);
 923 }
 924
 925 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 926                                 struct t10_pr_registration *, enum register_type, int);
 927
 928 static int __core_scsi3_check_aptpl_registration(
 929         struct se_device *dev,
 930         struct se_portal_group *tpg,
 931         struct se_lun *lun,
 932         u64 target_lun,
 933         struct se_node_acl *nacl,
 934         u64 mapped_lun)
 935 {
 936         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 937         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 938         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 939         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 940         u16 tpgt;
 941
 942         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 943         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 944         /*
 945          * Copy Initiator Port information from struct se_node_acl
 946          */
 947         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 948         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 949                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 950         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 951         /*
 952          * Look for the matching registrations+reservation from those
 953          * created from APTPL metadata.  Note that multiple registrations
 954          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 955          * TransportIDs.
 956          */
 957         spin_lock(&pr_tmpl->aptpl_reg_lock);
 958         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 959                                 pr_reg_aptpl_list) {
 960
 961                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 962                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 963                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 964                      (pr_reg->pr_reg_tpgt == tpgt) &&
 965                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 966                         /*
 967                          * Obtain the ->pr_reg_deve pointer + reference, that
 968                          * is released by __core_scsi3_add_registration() below.
 969                          */
 970                         rcu_read_lock();
 971                         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 972                         if (!pr_reg->pr_reg_deve) {
 973                                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
 974                                         " %llu\n", nacl->initiatorname, mapped_lun);
 975                                 rcu_read_unlock();
 976                                 continue;
 977                         }
 978                         kref_get(&pr_reg->pr_reg_deve->pr_kref);
 979                         rcu_read_unlock();
 980
 981                         pr_reg->pr_reg_nacl = nacl;
 982                         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 983                         list_del(&pr_reg->pr_reg_aptpl_list);
 984                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 985                         /*
 986                          * At this point all of the pointers in *pr_reg will
 987                          * be setup, so go ahead and add the registration.
 988                          */
 989                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 990                         /*
 991                          * If this registration is the reservation holder,
 992                          * make that happen now..
 993                          */
 994                         if (pr_reg->pr_res_holder)
 995                                 core_scsi3_aptpl_reserve(dev, tpg,
 996                                                 nacl, pr_reg);
 997                         /*
 998                          * Reenable pr_aptpl_active to accept new metadata
 999                          * updates once the SCSI device is active again..
1000                          */
1001                         spin_lock(&pr_tmpl->aptpl_reg_lock);
1002                         pr_tmpl->pr_aptpl_active = 1;
1003                 }
1004         }
1005         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1006
1007         return 0;
1008 }
1009
1010 int core_scsi3_check_aptpl_registration(
1011         struct se_device *dev,
1012         struct se_portal_group *tpg,
1013         struct se_lun *lun,
1014         struct se_node_acl *nacl,
1015         u64 mapped_lun)
1016 {
1017         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1018                 return 0;
1019
1020         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1021                                                      lun->unpacked_lun, nacl,
1022                                                      mapped_lun);
1023 }
1024
1025 static void __core_scsi3_dump_registration(
1026         const struct target_core_fabric_ops *tfo,
1027         struct se_device *dev,
1028         struct se_node_acl *nacl,
1029         struct t10_pr_registration *pr_reg,
1030         enum register_type register_type)
1031 {
1032         struct se_portal_group *se_tpg = nacl->se_tpg;
1033         char i_buf[PR_REG_ISID_ID_LEN];
1034
1035         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1036         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1037
1038         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1039                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1040                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1041                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1042                 i_buf);
1043         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1044                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1045                 tfo->tpg_get_tag(se_tpg));
1046         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1047                 " Port(s)\n",  tfo->get_fabric_name(),
1048                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1049                 dev->transport->name);
1050         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1051                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1052                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1053                 pr_reg->pr_reg_aptpl);
1054 }
1055
1056 static void __core_scsi3_add_registration(
1057         struct se_device *dev,
1058         struct se_node_acl *nacl,
1059         struct t10_pr_registration *pr_reg,
1060         enum register_type register_type,
1061         int register_move)
1062 {
1063         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1064         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1065         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1066         struct se_dev_entry *deve;
1067
1068         /*
1069          * Increment PRgeneration counter for struct se_device upon a successful
1070          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1071          *
1072          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1073          * action, the struct se_device->dev_reservation_lock will already be held,
1074          * so we do not call core_scsi3_pr_generation() which grabs the lock
1075          * for the REGISTER.
1076          */
1077         pr_reg->pr_res_generation = (register_move) ?
1078                         dev->t10_pr.pr_generation++ :
1079                         core_scsi3_pr_generation(dev);
1080
1081         spin_lock(&pr_tmpl->registration_lock);
1082         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1083
1084         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1085         spin_unlock(&pr_tmpl->registration_lock);
1086         /*
1087          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1088          */
1089         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1090                 goto out;
1091         /*
1092          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1093          * allocated in __core_scsi3_alloc_registration()
1094          */
1095         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1096                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1097                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1098
1099                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1100
1101                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1102
1103                 spin_lock(&pr_tmpl->registration_lock);
1104                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1105                               &pr_tmpl->registration_list);
1106
1107                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1108                                                register_type);
1109                 spin_unlock(&pr_tmpl->registration_lock);
1110                 /*
1111                  * Drop configfs group dependency reference and deve->pr_kref
1112                  * obtained from  __core_scsi3_alloc_registration() code.
1113                  */
1114                 rcu_read_lock();
1115                 deve = pr_reg_tmp->pr_reg_deve;
1116                 if (deve) {
1117                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1118                         core_scsi3_lunacl_undepend_item(deve);
1119                         pr_reg_tmp->pr_reg_deve = NULL;
1120                 }
1121                 rcu_read_unlock();
1122         }
1123 out:
1124         /*
1125          * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1126          */
1127         rcu_read_lock();
1128         deve = pr_reg->pr_reg_deve;
1129         if (deve) {
1130                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1131                 kref_put(&deve->pr_kref, target_pr_kref_release);
1132                 pr_reg->pr_reg_deve = NULL;
1133         }
1134         rcu_read_unlock();
1135 }
1136
1137 static int core_scsi3_alloc_registration(
1138         struct se_device *dev,
1139         struct se_node_acl *nacl,
1140         struct se_lun *lun,
1141         struct se_dev_entry *deve,
1142         u64 mapped_lun,
1143         unsigned char *isid,
1144         u64 sa_res_key,
1145         int all_tg_pt,
1146         int aptpl,
1147         enum register_type register_type,
1148         int register_move)
1149 {
1150         struct t10_pr_registration *pr_reg;
1151
1152         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1153                                                  isid, sa_res_key, all_tg_pt,
1154                                                  aptpl);
1155         if (!pr_reg)
1156                 return -EPERM;
1157
1158         __core_scsi3_add_registration(dev, nacl, pr_reg,
1159                         register_type, register_move);
1160         return 0;
1161 }
1162
1163 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1164         struct se_device *dev,
1165         struct se_node_acl *nacl,
1166         unsigned char *isid)
1167 {
1168         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1169         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1170         struct se_portal_group *tpg;
1171
1172         spin_lock(&pr_tmpl->registration_lock);
1173         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1174                         &pr_tmpl->registration_list, pr_reg_list) {
1175                 /*
1176                  * First look for a matching struct se_node_acl
1177                  */
1178                 if (pr_reg->pr_reg_nacl != nacl)
1179                         continue;
1180
1181                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1182                 /*
1183                  * If this registration does NOT contain a fabric provided
1184                  * ISID, then we have found a match.
1185                  */
1186                 if (!pr_reg->isid_present_at_reg) {
1187                         /*
1188                          * Determine if this SCSI device server requires that
1189                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1190                          * for fabric modules (iSCSI) requiring them.
1191                          */
1192                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1193                                 if (dev->dev_attrib.enforce_pr_isids)
1194                                         continue;
1195                         }
1196                         atomic_inc_mb(&pr_reg->pr_res_holders);
1197                         spin_unlock(&pr_tmpl->registration_lock);
1198                         return pr_reg;
1199                 }
1200                 /*
1201                  * If the *pr_reg contains a fabric defined ISID for multi-value
1202                  * SCSI Initiator Port TransportIDs, then we expect a valid
1203                  * matching ISID to be provided by the local SCSI Initiator Port.
1204                  */
1205                 if (!isid)
1206                         continue;
1207                 if (strcmp(isid, pr_reg->pr_reg_isid))
1208                         continue;
1209
1210                 atomic_inc_mb(&pr_reg->pr_res_holders);
1211                 spin_unlock(&pr_tmpl->registration_lock);
1212                 return pr_reg;
1213         }
1214         spin_unlock(&pr_tmpl->registration_lock);
1215
1216         return NULL;
1217 }
1218
1219 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1220         struct se_device *dev,
1221         struct se_node_acl *nacl,
1222         struct se_session *sess)
1223 {
1224         struct se_portal_group *tpg = nacl->se_tpg;
1225         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1226
1227         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1228                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1229                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1230                                         PR_REG_ISID_LEN);
1231                 isid_ptr = &buf[0];
1232         }
1233
1234         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1235 }
1236
1237 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1238 {
1239         atomic_dec_mb(&pr_reg->pr_res_holders);
1240 }
1241
1242 static int core_scsi3_check_implicit_release(
1243         struct se_device *dev,
1244         struct t10_pr_registration *pr_reg)
1245 {
1246         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1247         struct t10_pr_registration *pr_res_holder;
1248         int ret = 0;
1249
1250         spin_lock(&dev->dev_reservation_lock);
1251         pr_res_holder = dev->dev_pr_res_holder;
1252         if (!pr_res_holder) {
1253                 spin_unlock(&dev->dev_reservation_lock);
1254                 return ret;
1255         }
1256         if (pr_res_holder == pr_reg) {
1257                 /*
1258                  * Perform an implicit RELEASE if the registration that
1259                  * is being released is holding the reservation.
1260                  *
1261                  * From spc4r17, section 5.7.11.1:
1262                  *
1263                  * e) If the I_T nexus is the persistent reservation holder
1264                  *    and the persistent reservation is not an all registrants
1265                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1266                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1267                  *    service action with the SERVICE ACTION RESERVATION KEY
1268                  *    field set to zero (see 5.7.11.3).
1269                  */
1270                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1271                 ret = 1;
1272                 /*
1273                  * For 'All Registrants' reservation types, all existing
1274                  * registrations are still processed as reservation holders
1275                  * in core_scsi3_pr_seq_non_holder() after the initial
1276                  * reservation holder is implicitly released here.
1277                  */
1278         } else if (pr_reg->pr_reg_all_tg_pt &&
1279                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1280                           pr_reg->pr_reg_nacl->initiatorname)) &&
1281                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1282                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1283                         " UNREGISTER while existing reservation with matching"
1284                         " key 0x%016Lx is present from another SCSI Initiator"
1285                         " Port\n", pr_reg->pr_res_key);
1286                 ret = -EPERM;
1287         }
1288         spin_unlock(&dev->dev_reservation_lock);
1289
1290         return ret;
1291 }
1292
1293 /*
1294  * Called with struct t10_reservation->registration_lock held.
1295  */
1296 static void __core_scsi3_free_registration(
1297         struct se_device *dev,
1298         struct t10_pr_registration *pr_reg,
1299         struct list_head *preempt_and_abort_list,
1300         int dec_holders)
1301         __releases(&pr_tmpl->registration_lock)
1302         __acquires(&pr_tmpl->registration_lock)
1303 {
1304         const struct target_core_fabric_ops *tfo =
1305                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1306         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1307         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1308         struct se_dev_entry *deve;
1309         char i_buf[PR_REG_ISID_ID_LEN];
1310
1311         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1312         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1313
1314         if (!list_empty(&pr_reg->pr_reg_list))
1315                 list_del(&pr_reg->pr_reg_list);
1316         /*
1317          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1318          * so call core_scsi3_put_pr_reg() to decrement our reference.
1319          */
1320         if (dec_holders)
1321                 core_scsi3_put_pr_reg(pr_reg);
1322
1323         spin_unlock(&pr_tmpl->registration_lock);
1324         /*
1325          * Wait until all reference from any other I_T nexuses for this
1326          * *pr_reg have been released.  Because list_del() is called above,
1327          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1328          * count back to zero, and we release *pr_reg.
1329          */
1330         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1331                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1332                                 tfo->get_fabric_name());
1333                 cpu_relax();
1334         }
1335
1336         rcu_read_lock();
1337         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1338         if (deve)
1339                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1340         rcu_read_unlock();
1341
1342         spin_lock(&pr_tmpl->registration_lock);
1343         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1344                 " Node: %s%s\n", tfo->get_fabric_name(),
1345                 pr_reg->pr_reg_nacl->initiatorname,
1346                 i_buf);
1347         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1348                 " Port(s)\n", tfo->get_fabric_name(),
1349                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1350                 dev->transport->name);
1351         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1352                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1353                 pr_reg->pr_res_generation);
1354
1355         if (!preempt_and_abort_list) {
1356                 pr_reg->pr_reg_deve = NULL;
1357                 pr_reg->pr_reg_nacl = NULL;
1358                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1359                 return;
1360         }
1361         /*
1362          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1363          * are released once the ABORT_TASK_SET has completed..
1364          */
1365         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1366 }
1367
1368 void core_scsi3_free_pr_reg_from_nacl(
1369         struct se_device *dev,
1370         struct se_node_acl *nacl)
1371 {
1372         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1373         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1374         bool free_reg = false;
1375         /*
1376          * If the passed se_node_acl matches the reservation holder,
1377          * release the reservation.
1378          */
1379         spin_lock(&dev->dev_reservation_lock);
1380         pr_res_holder = dev->dev_pr_res_holder;
1381         if ((pr_res_holder != NULL) &&
1382             (pr_res_holder->pr_reg_nacl == nacl)) {
1383                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1384                 free_reg = true;
1385         }
1386         spin_unlock(&dev->dev_reservation_lock);
1387         /*
1388          * Release any registration associated with the struct se_node_acl.
1389          */
1390         spin_lock(&pr_tmpl->registration_lock);
1391         if (pr_res_holder && free_reg)
1392                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1393
1394         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1395                         &pr_tmpl->registration_list, pr_reg_list) {
1396
1397                 if (pr_reg->pr_reg_nacl != nacl)
1398                         continue;
1399
1400                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1401         }
1402         spin_unlock(&pr_tmpl->registration_lock);
1403 }
1404
1405 void core_scsi3_free_all_registrations(
1406         struct se_device *dev)
1407 {
1408         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1409         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1410
1411         spin_lock(&dev->dev_reservation_lock);
1412         pr_res_holder = dev->dev_pr_res_holder;
1413         if (pr_res_holder != NULL) {
1414                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1415                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1416                                                   pr_res_holder, 0, 0);
1417         }
1418         spin_unlock(&dev->dev_reservation_lock);
1419
1420         spin_lock(&pr_tmpl->registration_lock);
1421         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1422                         &pr_tmpl->registration_list, pr_reg_list) {
1423
1424                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1425         }
1426         spin_unlock(&pr_tmpl->registration_lock);
1427
1428         spin_lock(&pr_tmpl->aptpl_reg_lock);
1429         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1430                                 pr_reg_aptpl_list) {
1431                 list_del(&pr_reg->pr_reg_aptpl_list);
1432                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1433         }
1434         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1435 }
1436
1437 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1438 {
1439         return target_depend_item(&tpg->tpg_group.cg_item);
1440 }
1441
1442 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1443 {
1444         target_undepend_item(&tpg->tpg_group.cg_item);
1445         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1446 }
1447
1448 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1449 {
1450         if (nacl->dynamic_node_acl)
1451                 return 0;
1452         return target_depend_item(&nacl->acl_group.cg_item);
1453 }
1454
1455 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1456 {
1457         if (!nacl->dynamic_node_acl)
1458                 target_undepend_item(&nacl->acl_group.cg_item);
1459         atomic_dec_mb(&nacl->acl_pr_ref_count);
1460 }
1461
1462 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1463 {
1464         struct se_lun_acl *lun_acl;
1465
1466         /*
1467          * For nacl->dynamic_node_acl=1
1468          */
1469         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1470                                 kref_read(&se_deve->pr_kref) != 0);
1471         if (!lun_acl)
1472                 return 0;
1473
1474         return target_depend_item(&lun_acl->se_lun_group.cg_item);
1475 }
1476
1477 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1478 {
1479         struct se_lun_acl *lun_acl;
1480
1481         /*
1482          * For nacl->dynamic_node_acl=1
1483          */
1484         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1485                                 kref_read(&se_deve->pr_kref) != 0);
1486         if (!lun_acl) {
1487                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1488                 return;
1489         }
1490
1491         target_undepend_item(&lun_acl->se_lun_group.cg_item);
1492         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1493 }
1494
1495 static sense_reason_t
1496 core_scsi3_decode_spec_i_port(
1497         struct se_cmd *cmd,
1498         struct se_portal_group *tpg,
1499         unsigned char *l_isid,
1500         u64 sa_res_key,
1501         int all_tg_pt,
1502         int aptpl)
1503 {
1504         struct se_device *dev = cmd->se_dev;
1505         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1506         struct se_session *se_sess = cmd->se_sess;
1507         struct se_node_acl *dest_node_acl = NULL;
1508         struct se_dev_entry *dest_se_deve = NULL;
1509         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1510         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1511         LIST_HEAD(tid_dest_list);
1512         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1513         unsigned char *buf, *ptr, proto_ident;
1514         const unsigned char *i_str = NULL;
1515         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1516         sense_reason_t ret;
1517         u32 tpdl, tid_len = 0;
1518         u32 dest_rtpi = 0;
1519
1520         /*
1521          * Allocate a struct pr_transport_id_holder and setup the
1522          * local_node_acl pointer and add to struct list_head tid_dest_list
1523          * for add registration processing in the loop of tid_dest_list below.
1524          */
1525         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1526         if (!tidh_new) {
1527                 pr_err("Unable to allocate tidh_new\n");
1528                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1529         }
1530         INIT_LIST_HEAD(&tidh_new->dest_list);
1531         tidh_new->dest_tpg = tpg;
1532         tidh_new->dest_node_acl = se_sess->se_node_acl;
1533
1534         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1535                                 se_sess->se_node_acl, cmd->se_lun,
1536                                 NULL, cmd->orig_fe_lun, l_isid,
1537                                 sa_res_key, all_tg_pt, aptpl);
1538         if (!local_pr_reg) {
1539                 kfree(tidh_new);
1540                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1541         }
1542         tidh_new->dest_pr_reg = local_pr_reg;
1543         /*
1544          * The local I_T nexus does not hold any configfs dependances,
1545          * so we set tidh_new->dest_se_deve to NULL to prevent the
1546          * configfs_undepend_item() calls in the tid_dest_list loops below.
1547          */
1548         tidh_new->dest_se_deve = NULL;
1549         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1550
1551         if (cmd->data_length < 28) {
1552                 pr_warn("SPC-PR: Received PR OUT parameter list"
1553                         " length too small: %u\n", cmd->data_length);
1554                 ret = TCM_INVALID_PARAMETER_LIST;
1555                 goto out;
1556         }
1557
1558         buf = transport_kmap_data_sg(cmd);
1559         if (!buf) {
1560                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1561                 goto out;
1562         }
1563
1564         /*
1565          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1566          * first extract TransportID Parameter Data Length, and make sure
1567          * the value matches up to the SCSI expected data transfer length.
1568          */
1569         tpdl = get_unaligned_be32(&buf[24]);
1570
1571         if ((tpdl + 28) != cmd->data_length) {
1572                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1573                         " does not equal CDB data_length: %u\n", tpdl,
1574                         cmd->data_length);
1575                 ret = TCM_INVALID_PARAMETER_LIST;
1576                 goto out_unmap;
1577         }
1578         /*
1579          * Start processing the received transport IDs using the
1580          * receiving I_T Nexus portal's fabric dependent methods to
1581          * obtain the SCSI Initiator Port/Device Identifiers.
1582          */
1583         ptr = &buf[28];
1584
1585         while (tpdl > 0) {
1586                 struct se_lun *dest_lun, *tmp_lun;
1587
1588                 proto_ident = (ptr[0] & 0x0f);
1589                 dest_tpg = NULL;
1590
1591                 spin_lock(&dev->se_port_lock);
1592                 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1593                         tmp_tpg = tmp_lun->lun_tpg;
1594
1595                         /*
1596                          * Look for the matching proto_ident provided by
1597                          * the received TransportID
1598                          */
1599                         if (tmp_tpg->proto_id != proto_ident)
1600                                 continue;
1601                         dest_rtpi = tmp_lun->lun_rtpi;
1602
1603                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1604                                         ptr, &tid_len, &iport_ptr);
1605                         if (!i_str)
1606                                 continue;
1607
1608                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1609                         spin_unlock(&dev->se_port_lock);
1610
1611                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1612                                 pr_err(" core_scsi3_tpg_depend_item()"
1613                                         " for tmp_tpg\n");
1614                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1615                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1616                                 goto out_unmap;
1617                         }
1618                         /*
1619                          * Locate the destination initiator ACL to be registered
1620                          * from the decoded fabric module specific TransportID
1621                          * at *i_str.
1622                          */
1623                         mutex_lock(&tmp_tpg->acl_node_mutex);
1624                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1625                                                 tmp_tpg, i_str);
1626                         if (dest_node_acl)
1627                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1628                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1629
1630                         if (!dest_node_acl) {
1631                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1632                                 spin_lock(&dev->se_port_lock);
1633                                 continue;
1634                         }
1635
1636                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1637                                 pr_err("configfs_depend_item() failed"
1638                                         " for dest_node_acl->acl_group\n");
1639                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1640                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1641                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1642                                 goto out_unmap;
1643                         }
1644
1645                         dest_tpg = tmp_tpg;
1646                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1647                                 " %s Port RTPI: %hu\n",
1648                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1649                                 dest_node_acl->initiatorname, dest_rtpi);
1650
1651                         spin_lock(&dev->se_port_lock);
1652                         break;
1653                 }
1654                 spin_unlock(&dev->se_port_lock);
1655
1656                 if (!dest_tpg) {
1657                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1658                                         " dest_tpg\n");
1659                         ret = TCM_INVALID_PARAMETER_LIST;
1660                         goto out_unmap;
1661                 }
1662
1663                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1664                         " tid_len: %d for %s + %s\n",
1665                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1666                         tpdl, tid_len, i_str, iport_ptr);
1667
1668                 if (tid_len > tpdl) {
1669                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1670                                 " %u for Transport ID: %s\n", tid_len, ptr);
1671                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672                         core_scsi3_tpg_undepend_item(dest_tpg);
1673                         ret = TCM_INVALID_PARAMETER_LIST;
1674                         goto out_unmap;
1675                 }
1676                 /*
1677                  * Locate the desintation struct se_dev_entry pointer for matching
1678                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1679                  * Target Port.
1680                  */
1681                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1682                                         dest_rtpi);
1683                 if (!dest_se_deve) {
1684                         pr_err("Unable to locate %s dest_se_deve"
1685                                 " from destination RTPI: %hu\n",
1686                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1687                                 dest_rtpi);
1688
1689                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1690                         core_scsi3_tpg_undepend_item(dest_tpg);
1691                         ret = TCM_INVALID_PARAMETER_LIST;
1692                         goto out_unmap;
1693                 }
1694
1695                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1696                         pr_err("core_scsi3_lunacl_depend_item()"
1697                                         " failed\n");
1698                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1699                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1700                         core_scsi3_tpg_undepend_item(dest_tpg);
1701                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1702                         goto out_unmap;
1703                 }
1704
1705                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1706                         " dest_se_deve mapped_lun: %llu\n",
1707                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1708                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1709
1710                 /*
1711                  * Skip any TransportIDs that already have a registration for
1712                  * this target port.
1713                  */
1714                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1715                                         iport_ptr);
1716                 if (pr_reg_e) {
1717                         core_scsi3_put_pr_reg(pr_reg_e);
1718                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1719                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720                         core_scsi3_tpg_undepend_item(dest_tpg);
1721                         ptr += tid_len;
1722                         tpdl -= tid_len;
1723                         tid_len = 0;
1724                         continue;
1725                 }
1726                 /*
1727                  * Allocate a struct pr_transport_id_holder and setup
1728                  * the dest_node_acl and dest_se_deve pointers for the
1729                  * loop below.
1730                  */
1731                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1732                                 GFP_KERNEL);
1733                 if (!tidh_new) {
1734                         pr_err("Unable to allocate tidh_new\n");
1735                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1736                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1737                         core_scsi3_tpg_undepend_item(dest_tpg);
1738                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1739                         goto out_unmap;
1740                 }
1741                 INIT_LIST_HEAD(&tidh_new->dest_list);
1742                 tidh_new->dest_tpg = dest_tpg;
1743                 tidh_new->dest_node_acl = dest_node_acl;
1744                 tidh_new->dest_se_deve = dest_se_deve;
1745
1746                 /*
1747                  * Allocate, but do NOT add the registration for the
1748                  * TransportID referenced SCSI Initiator port.  This
1749                  * done because of the following from spc4r17 in section
1750                  * 6.14.3 wrt SPEC_I_PT:
1751                  *
1752                  * "If a registration fails for any initiator port (e.g., if th
1753                  * logical unit does not have enough resources available to
1754                  * hold the registration information), no registrations shall be
1755                  * made, and the command shall be terminated with
1756                  * CHECK CONDITION status."
1757                  *
1758                  * That means we call __core_scsi3_alloc_registration() here,
1759                  * and then call __core_scsi3_add_registration() in the
1760                  * 2nd loop which will never fail.
1761                  */
1762                 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1763                                 kref_read(&dest_se_deve->pr_kref) != 0);
1764
1765                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1766                                         dest_node_acl, dest_lun, dest_se_deve,
1767                                         dest_se_deve->mapped_lun, iport_ptr,
1768                                         sa_res_key, all_tg_pt, aptpl);
1769                 if (!dest_pr_reg) {
1770                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1771                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1772                         core_scsi3_tpg_undepend_item(dest_tpg);
1773                         kfree(tidh_new);
1774                         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1775                         goto out_unmap;
1776                 }
1777                 tidh_new->dest_pr_reg = dest_pr_reg;
1778                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1779
1780                 ptr += tid_len;
1781                 tpdl -= tid_len;
1782                 tid_len = 0;
1783
1784         }
1785
1786         transport_kunmap_data_sg(cmd);
1787
1788         /*
1789          * Go ahead and create a registrations from tid_dest_list for the
1790          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1791          * and dest_se_deve.
1792          *
1793          * The SA Reservation Key from the PROUT is set for the
1794          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1795          * means that the TransportID Initiator port will be
1796          * registered on all of the target ports in the SCSI target device
1797          * ALL_TG_PT=0 means the registration will only be for the
1798          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1799          * was received.
1800          */
1801         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1802                 dest_tpg = tidh->dest_tpg;
1803                 dest_node_acl = tidh->dest_node_acl;
1804                 dest_se_deve = tidh->dest_se_deve;
1805                 dest_pr_reg = tidh->dest_pr_reg;
1806
1807                 list_del(&tidh->dest_list);
1808                 kfree(tidh);
1809
1810                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1811                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1812
1813                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1814                                         dest_pr_reg, 0, 0);
1815
1816                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1817                         " registered Transport ID for Node: %s%s Mapped LUN:"
1818                         " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1819                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1820                         dest_se_deve->mapped_lun : 0);
1821
1822                 if (!dest_se_deve) {
1823                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1824                                  target_pr_kref_release);
1825                         continue;
1826                 }
1827                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1828                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1829                 core_scsi3_tpg_undepend_item(dest_tpg);
1830         }
1831
1832         return 0;
1833 out_unmap:
1834         transport_kunmap_data_sg(cmd);
1835 out:
1836         /*
1837          * For the failure case, release everything from tid_dest_list
1838          * including *dest_pr_reg and the configfs dependances..
1839          */
1840         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1841                 dest_tpg = tidh->dest_tpg;
1842                 dest_node_acl = tidh->dest_node_acl;
1843                 dest_se_deve = tidh->dest_se_deve;
1844                 dest_pr_reg = tidh->dest_pr_reg;
1845
1846                 list_del(&tidh->dest_list);
1847                 kfree(tidh);
1848                 /*
1849                  * Release any extra ALL_TG_PT=1 registrations for
1850                  * the SPEC_I_PT=1 case.
1851                  */
1852                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1853                                 &dest_pr_reg->pr_reg_atp_list,
1854                                 pr_reg_atp_mem_list) {
1855                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1856                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1857                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1858                 }
1859
1860                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1861
1862                 if (!dest_se_deve) {
1863                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1864                                  target_pr_kref_release);
1865                         continue;
1866                 }
1867                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1868                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1869                 core_scsi3_tpg_undepend_item(dest_tpg);
1870         }
1871         return ret;
1872 }
1873
1874 static int core_scsi3_update_aptpl_buf(
1875         struct se_device *dev,
1876         unsigned char *buf,
1877         u32 pr_aptpl_buf_len)
1878 {
1879         struct se_portal_group *tpg;
1880         struct t10_pr_registration *pr_reg;
1881         unsigned char tmp[512], isid_buf[32];
1882         ssize_t len = 0;
1883         int reg_count = 0;
1884         int ret = 0;
1885
1886         spin_lock(&dev->dev_reservation_lock);
1887         spin_lock(&dev->t10_pr.registration_lock);
1888         /*
1889          * Walk the registration list..
1890          */
1891         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1892                         pr_reg_list) {
1893
1894                 tmp[0] = '\0';
1895                 isid_buf[0] = '\0';
1896                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1897                 /*
1898                  * Write out any ISID value to APTPL metadata that was included
1899                  * in the original registration.
1900                  */
1901                 if (pr_reg->isid_present_at_reg)
1902                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1903                                         pr_reg->pr_reg_isid);
1904                 /*
1905                  * Include special metadata if the pr_reg matches the
1906                  * reservation holder.
1907                  */
1908                 if (dev->dev_pr_res_holder == pr_reg) {
1909                         snprintf(tmp, 512, "PR_REG_START: %d"
1910                                 "\ninitiator_fabric=%s\n"
1911                                 "initiator_node=%s\n%s"
1912                                 "sa_res_key=%llu\n"
1913                                 "res_holder=1\nres_type=%02x\n"
1914                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1915                                 "mapped_lun=%llu\n", reg_count,
1916                                 tpg->se_tpg_tfo->get_fabric_name(),
1917                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1918                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1919                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1920                                 pr_reg->pr_res_mapped_lun);
1921                 } else {
1922                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1923                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1924                                 "sa_res_key=%llu\nres_holder=0\n"
1925                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1926                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1927                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1928                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1929                                 pr_reg->pr_res_mapped_lun);
1930                 }
1931
1932                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1933                         pr_err("Unable to update renaming APTPL metadata,"
1934                                " reallocating larger buffer\n");
1935                         ret = -EMSGSIZE;
1936                         goto out;
1937                 }
1938                 len += sprintf(buf+len, "%s", tmp);
1939
1940                 /*
1941                  * Include information about the associated SCSI target port.
1942                  */
1943                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1944                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1945                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1946                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1947                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1948                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1949                         reg_count);
1950
1951                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1952                         pr_err("Unable to update renaming APTPL metadata,"
1953                                " reallocating larger buffer\n");
1954                         ret = -EMSGSIZE;
1955                         goto out;
1956                 }
1957                 len += sprintf(buf+len, "%s", tmp);
1958                 reg_count++;
1959         }
1960
1961         if (!reg_count)
1962                 len += sprintf(buf+len, "No Registrations or Reservations");
1963
1964 out:
1965         spin_unlock(&dev->t10_pr.registration_lock);
1966         spin_unlock(&dev->dev_reservation_lock);
1967
1968         return ret;
1969 }
1970
1971 static int __core_scsi3_write_aptpl_to_file(
1972         struct se_device *dev,
1973         unsigned char *buf)
1974 {
1975         struct t10_wwn *wwn = &dev->t10_wwn;
1976         struct file *file;
1977         int flags = O_RDWR | O_CREAT | O_TRUNC;
1978         char *path;
1979         u32 pr_aptpl_buf_len;
1980         int ret;
1981         loff_t pos = 0;
1982
1983         path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
1984                         &wwn->unit_serial[0]);
1985         if (!path)
1986                 return -ENOMEM;
1987
1988         file = filp_open(path, flags, 0600);
1989         if (IS_ERR(file)) {
1990                 pr_err("filp_open(%s) for APTPL metadata"
1991                         " failed\n", path);
1992                 kfree(path);
1993                 return PTR_ERR(file);
1994         }
1995
1996         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1997
1998         ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
1999
2000         if (ret < 0)
2001                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2002         fput(file);
2003         kfree(path);
2004
2005         return (ret < 0) ? -EIO : 0;
2006 }
2007
2008 /*
2009  * Clear the APTPL metadata if APTPL has been disabled, otherwise
2010  * write out the updated metadata to struct file for this SCSI device.
2011  */
2012 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
2013 {
2014         unsigned char *buf;
2015         int rc, len = PR_APTPL_BUF_LEN;
2016
2017         if (!aptpl) {
2018                 char *null_buf = "No Registrations or Reservations\n";
2019
2020                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2021                 dev->t10_pr.pr_aptpl_active = 0;
2022                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2023
2024                 if (rc)
2025                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2026
2027                 return 0;
2028         }
2029 retry:
2030         buf = vzalloc(len);
2031         if (!buf)
2032                 return TCM_OUT_OF_RESOURCES;
2033
2034         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2035         if (rc < 0) {
2036                 vfree(buf);
2037                 len *= 2;
2038                 goto retry;
2039         }
2040
2041         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2042         if (rc != 0) {
2043                 pr_err("SPC-3 PR: Could not update APTPL\n");
2044                 vfree(buf);
2045                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2046         }
2047         dev->t10_pr.pr_aptpl_active = 1;
2048         vfree(buf);
2049         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2050         return 0;
2051 }
2052
2053 static sense_reason_t
2054 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2055                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2056 {
2057         struct se_session *se_sess = cmd->se_sess;
2058         struct se_device *dev = cmd->se_dev;
2059         struct se_lun *se_lun = cmd->se_lun;
2060         struct se_portal_group *se_tpg;
2061         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2062         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2063         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2064         sense_reason_t ret = TCM_NO_SENSE;
2065         int pr_holder = 0, type;
2066
2067         if (!se_sess || !se_lun) {
2068                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2069                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2070         }
2071         se_tpg = se_sess->se_tpg;
2072
2073         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2074                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2075                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2076                                 PR_REG_ISID_LEN);
2077                 isid_ptr = &isid_buf[0];
2078         }
2079         /*
2080          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2081          */
2082         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2083         if (!pr_reg) {
2084                 if (res_key) {
2085                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2086                                 " for SA REGISTER, returning CONFLICT\n");
2087                         return TCM_RESERVATION_CONFLICT;
2088                 }
2089                 /*
2090                  * Do nothing but return GOOD status.
2091                  */
2092                 if (!sa_res_key)
2093                         return 0;
2094
2095                 if (!spec_i_pt) {
2096                         /*
2097                          * Perform the Service Action REGISTER on the Initiator
2098                          * Port Endpoint that the PRO was received from on the
2099                          * Logical Unit of the SCSI device server.
2100                          */
2101                         if (core_scsi3_alloc_registration(cmd->se_dev,
2102                                         se_sess->se_node_acl, cmd->se_lun,
2103                                         NULL, cmd->orig_fe_lun, isid_ptr,
2104                                         sa_res_key, all_tg_pt, aptpl,
2105                                         register_type, 0)) {
2106                                 pr_err("Unable to allocate"
2107                                         " struct t10_pr_registration\n");
2108                                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
2109                         }
2110                 } else {
2111                         /*
2112                          * Register both the Initiator port that received
2113                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2114                          * TransportID from Parameter list and loop through
2115                          * fabric dependent parameter list while calling
2116                          * logic from of core_scsi3_alloc_registration() for
2117                          * each TransportID provided SCSI Initiator Port/Device
2118                          */
2119                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2120                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2121                         if (ret != 0)
2122                                 return ret;
2123                 }
2124                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2125         }
2126
2127         /* ok, existing registration */
2128
2129         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2130                 pr_err("SPC-3 PR REGISTER: Received"
2131                        " res_key: 0x%016Lx does not match"
2132                        " existing SA REGISTER res_key:"
2133                        " 0x%016Lx\n", res_key,
2134                        pr_reg->pr_res_key);
2135                 ret = TCM_RESERVATION_CONFLICT;
2136                 goto out;
2137         }
2138
2139         if (spec_i_pt) {
2140                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2141                         " set on a registered nexus\n");
2142                 ret = TCM_INVALID_PARAMETER_LIST;
2143                 goto out;
2144         }
2145
2146         /*
2147          * An existing ALL_TG_PT=1 registration being released
2148          * must also set ALL_TG_PT=1 in the incoming PROUT.
2149          */
2150         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2151                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2152                         " registration exists, but ALL_TG_PT=1 bit not"
2153                         " present in received PROUT\n");
2154                 ret = TCM_INVALID_CDB_FIELD;
2155                 goto out;
2156         }
2157
2158         /*
2159          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2160          */
2161         if (sa_res_key) {
2162                 /*
2163                  * Increment PRgeneration counter for struct se_device"
2164                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2165                  * READ_KEYS service action.
2166                  */
2167                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2168                 pr_reg->pr_res_key = sa_res_key;
2169                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2170                          " Key for %s to: 0x%016Lx PRgeneration:"
2171                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2172                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2173                          pr_reg->pr_reg_nacl->initiatorname,
2174                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2175
2176         } else {
2177                 /*
2178                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2179                  */
2180                 type = pr_reg->pr_res_type;
2181                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2182                                                               pr_reg);
2183                 if (pr_holder < 0) {
2184                         ret = TCM_RESERVATION_CONFLICT;
2185                         goto out;
2186                 }
2187
2188                 spin_lock(&pr_tmpl->registration_lock);
2189                 /*
2190                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2191                  * and matching pr_res_key.
2192                  */
2193                 if (pr_reg->pr_reg_all_tg_pt) {
2194                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2195                                         &pr_tmpl->registration_list,
2196                                         pr_reg_list) {
2197
2198                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2199                                         continue;
2200                                 if (pr_reg_p->pr_res_key != res_key)
2201                                         continue;
2202                                 if (pr_reg == pr_reg_p)
2203                                         continue;
2204                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2205                                            pr_reg_p->pr_reg_nacl->initiatorname))
2206                                         continue;
2207
2208                                 __core_scsi3_free_registration(dev,
2209                                                 pr_reg_p, NULL, 0);
2210                         }
2211                 }
2212
2213                 /*
2214                  * Release the calling I_T Nexus registration now..
2215                  */
2216                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2217                 pr_reg = NULL;
2218
2219                 /*
2220                  * From spc4r17, section 5.7.11.3 Unregistering
2221                  *
2222                  * If the persistent reservation is a registrants only
2223                  * type, the device server shall establish a unit
2224                  * attention condition for the initiator port associated
2225                  * with every registered I_T nexus except for the I_T
2226                  * nexus on which the PERSISTENT RESERVE OUT command was
2227                  * received, with the additional sense code set to
2228                  * RESERVATIONS RELEASED.
2229                  */
2230                 if (pr_holder &&
2231                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2232                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2233                         list_for_each_entry(pr_reg_p,
2234                                         &pr_tmpl->registration_list,
2235                                         pr_reg_list) {
2236
2237                                 target_ua_allocate_lun(
2238                                         pr_reg_p->pr_reg_nacl,
2239                                         pr_reg_p->pr_res_mapped_lun,
2240                                         0x2A,
2241                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2242                         }
2243                 }
2244
2245                 spin_unlock(&pr_tmpl->registration_lock);
2246         }
2247
2248         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2249
2250 out:
2251         if (pr_reg)
2252                 core_scsi3_put_pr_reg(pr_reg);
2253         return ret;
2254 }
2255
2256 unsigned char *core_scsi3_pr_dump_type(int type)
2257 {
2258         switch (type) {
2259         case PR_TYPE_WRITE_EXCLUSIVE:
2260                 return "Write Exclusive Access";
2261         case PR_TYPE_EXCLUSIVE_ACCESS:
2262                 return "Exclusive Access";
2263         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2264                 return "Write Exclusive Access, Registrants Only";
2265         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2266                 return "Exclusive Access, Registrants Only";
2267         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2268                 return "Write Exclusive Access, All Registrants";
2269         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2270                 return "Exclusive Access, All Registrants";
2271         default:
2272                 break;
2273         }
2274
2275         return "Unknown SPC-3 PR Type";
2276 }
2277
2278 static sense_reason_t
2279 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2280 {
2281         struct se_device *dev = cmd->se_dev;
2282         struct se_session *se_sess = cmd->se_sess;
2283         struct se_lun *se_lun = cmd->se_lun;
2284         struct t10_pr_registration *pr_reg, *pr_res_holder;
2285         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2286         char i_buf[PR_REG_ISID_ID_LEN];
2287         sense_reason_t ret;
2288
2289         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2290
2291         if (!se_sess || !se_lun) {
2292                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2293                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2294         }
2295         /*
2296          * Locate the existing *pr_reg via struct se_node_acl pointers
2297          */
2298         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2299                                 se_sess);
2300         if (!pr_reg) {
2301                 pr_err("SPC-3 PR: Unable to locate"
2302                         " PR_REGISTERED *pr_reg for RESERVE\n");
2303                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2304         }
2305         /*
2306          * From spc4r17 Section 5.7.9: Reserving:
2307          *
2308          * An application client creates a persistent reservation by issuing
2309          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2310          * a registered I_T nexus with the following parameters:
2311          *    a) RESERVATION KEY set to the value of the reservation key that is
2312          *       registered with the logical unit for the I_T nexus; and
2313          */
2314         if (res_key != pr_reg->pr_res_key) {
2315                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2316                         " does not match existing SA REGISTER res_key:"
2317                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2318                 ret = TCM_RESERVATION_CONFLICT;
2319                 goto out_put_pr_reg;
2320         }
2321         /*
2322          * From spc4r17 Section 5.7.9: Reserving:
2323          *
2324          * From above:
2325          *  b) TYPE field and SCOPE field set to the persistent reservation
2326          *     being created.
2327          *
2328          * Only one persistent reservation is allowed at a time per logical unit
2329          * and that persistent reservation has a scope of LU_SCOPE.
2330          */
2331         if (scope != PR_SCOPE_LU_SCOPE) {
2332                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2333                 ret = TCM_INVALID_PARAMETER_LIST;
2334                 goto out_put_pr_reg;
2335         }
2336         /*
2337          * See if we have an existing PR reservation holder pointer at
2338          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2339          * *pr_res_holder.
2340          */
2341         spin_lock(&dev->dev_reservation_lock);
2342         pr_res_holder = dev->dev_pr_res_holder;
2343         if (pr_res_holder) {
2344                 /*
2345                  * From spc4r17 Section 5.7.9: Reserving:
2346                  *
2347                  * If the device server receives a PERSISTENT RESERVE OUT
2348                  * command from an I_T nexus other than a persistent reservation
2349                  * holder (see 5.7.10) that attempts to create a persistent
2350                  * reservation when a persistent reservation already exists for
2351                  * the logical unit, then the command shall be completed with
2352                  * RESERVATION CONFLICT status.
2353                  */
2354                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2355                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2356                         pr_err("SPC-3 PR: Attempted RESERVE from"
2357                                 " [%s]: %s while reservation already held by"
2358                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2359                                 cmd->se_tfo->get_fabric_name(),
2360                                 se_sess->se_node_acl->initiatorname,
2361                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2362                                 pr_res_holder->pr_reg_nacl->initiatorname);
2363
2364                         spin_unlock(&dev->dev_reservation_lock);
2365                         ret = TCM_RESERVATION_CONFLICT;
2366                         goto out_put_pr_reg;
2367                 }
2368                 /*
2369                  * From spc4r17 Section 5.7.9: Reserving:
2370                  *
2371                  * If a persistent reservation holder attempts to modify the
2372                  * type or scope of an existing persistent reservation, the
2373                  * command shall be completed with RESERVATION CONFLICT status.
2374                  */
2375                 if ((pr_res_holder->pr_res_type != type) ||
2376                     (pr_res_holder->pr_res_scope != scope)) {
2377                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2378                         pr_err("SPC-3 PR: Attempted RESERVE from"
2379                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2380                                 " while reservation already held by [%s]: %s,"
2381                                 " returning RESERVATION_CONFLICT\n",
2382                                 cmd->se_tfo->get_fabric_name(),
2383                                 se_sess->se_node_acl->initiatorname,
2384                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2385                                 pr_res_holder->pr_reg_nacl->initiatorname);
2386
2387                         spin_unlock(&dev->dev_reservation_lock);
2388                         ret = TCM_RESERVATION_CONFLICT;
2389                         goto out_put_pr_reg;
2390                 }
2391                 /*
2392                  * From spc4r17 Section 5.7.9: Reserving:
2393                  *
2394                  * If the device server receives a PERSISTENT RESERVE OUT
2395                  * command with RESERVE service action where the TYPE field and
2396                  * the SCOPE field contain the same values as the existing type
2397                  * and scope from a persistent reservation holder, it shall not
2398                  * make any change to the existing persistent reservation and
2399                  * shall completethe command with GOOD status.
2400                  */
2401                 spin_unlock(&dev->dev_reservation_lock);
2402                 ret = 0;
2403                 goto out_put_pr_reg;
2404         }
2405         /*
2406          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2407          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2408          */
2409         pr_reg->pr_res_scope = scope;
2410         pr_reg->pr_res_type = type;
2411         pr_reg->pr_res_holder = 1;
2412         dev->dev_pr_res_holder = pr_reg;
2413         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2414
2415         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2416                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2417                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2418                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2419         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2420                         cmd->se_tfo->get_fabric_name(),
2421                         se_sess->se_node_acl->initiatorname,
2422                         i_buf);
2423         spin_unlock(&dev->dev_reservation_lock);
2424
2425         if (pr_tmpl->pr_aptpl_active)
2426                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2427
2428         ret = 0;
2429 out_put_pr_reg:
2430         core_scsi3_put_pr_reg(pr_reg);
2431         return ret;
2432 }
2433
2434 static sense_reason_t
2435 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2436                 u64 res_key)
2437 {
2438         switch (type) {
2439         case PR_TYPE_WRITE_EXCLUSIVE:
2440         case PR_TYPE_EXCLUSIVE_ACCESS:
2441         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2442         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2443         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2444         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2445                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2446         default:
2447                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2448                         " 0x%02x\n", type);
2449                 return TCM_INVALID_CDB_FIELD;
2450         }
2451 }
2452
2453 /*
2454  * Called with struct se_device->dev_reservation_lock held.
2455  */
2456 static void __core_scsi3_complete_pro_release(
2457         struct se_device *dev,
2458         struct se_node_acl *se_nacl,
2459         struct t10_pr_registration *pr_reg,
2460         int explicit,
2461         int unreg)
2462 {
2463         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2464         char i_buf[PR_REG_ISID_ID_LEN];
2465         int pr_res_type = 0, pr_res_scope = 0;
2466
2467         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2468         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2469         /*
2470          * Go ahead and release the current PR reservation holder.
2471          * If an All Registrants reservation is currently active and
2472          * a unregister operation is requested, replace the current
2473          * dev_pr_res_holder with another active registration.
2474          */
2475         if (dev->dev_pr_res_holder) {
2476                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2477                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2478                 dev->dev_pr_res_holder->pr_res_type = 0;
2479                 dev->dev_pr_res_holder->pr_res_scope = 0;
2480                 dev->dev_pr_res_holder->pr_res_holder = 0;
2481                 dev->dev_pr_res_holder = NULL;
2482         }
2483         if (!unreg)
2484                 goto out;
2485
2486         spin_lock(&dev->t10_pr.registration_lock);
2487         list_del_init(&pr_reg->pr_reg_list);
2488         /*
2489          * If the I_T nexus is a reservation holder, the persistent reservation
2490          * is of an all registrants type, and the I_T nexus is the last remaining
2491          * registered I_T nexus, then the device server shall also release the
2492          * persistent reservation.
2493          */
2494         if (!list_empty(&dev->t10_pr.registration_list) &&
2495             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2496              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2497                 dev->dev_pr_res_holder =
2498                         list_entry(dev->t10_pr.registration_list.next,
2499                                    struct t10_pr_registration, pr_reg_list);
2500                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2501                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2502                 dev->dev_pr_res_holder->pr_res_holder = 1;
2503         }
2504         spin_unlock(&dev->t10_pr.registration_lock);
2505 out:
2506         if (!dev->dev_pr_res_holder) {
2507                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2508                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2509                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2510                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2511                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2512         }
2513         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2514                 tfo->get_fabric_name(), se_nacl->initiatorname,
2515                 i_buf);
2516         /*
2517          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2518          */
2519         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2520 }
2521
2522 static sense_reason_t
2523 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2524                 u64 res_key)
2525 {
2526         struct se_device *dev = cmd->se_dev;
2527         struct se_session *se_sess = cmd->se_sess;
2528         struct se_lun *se_lun = cmd->se_lun;
2529         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2530         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2531         sense_reason_t ret = 0;
2532
2533         if (!se_sess || !se_lun) {
2534                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2535                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2536         }
2537         /*
2538          * Locate the existing *pr_reg via struct se_node_acl pointers
2539          */
2540         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2541         if (!pr_reg) {
2542                 pr_err("SPC-3 PR: Unable to locate"
2543                         " PR_REGISTERED *pr_reg for RELEASE\n");
2544                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2545         }
2546         /*
2547          * From spc4r17 Section 5.7.11.2 Releasing:
2548          *
2549          * If there is no persistent reservation or in response to a persistent
2550          * reservation release request from a registered I_T nexus that is not a
2551          * persistent reservation holder (see 5.7.10), the device server shall
2552          * do the following:
2553          *
2554          *     a) Not release the persistent reservation, if any;
2555          *     b) Not remove any registrations; and
2556          *     c) Complete the command with GOOD status.
2557          */
2558         spin_lock(&dev->dev_reservation_lock);
2559         pr_res_holder = dev->dev_pr_res_holder;
2560         if (!pr_res_holder) {
2561                 /*
2562                  * No persistent reservation, return GOOD status.
2563                  */
2564                 spin_unlock(&dev->dev_reservation_lock);
2565                 goto out_put_pr_reg;
2566         }
2567
2568         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2569                 /*
2570                  * Release request from a registered I_T nexus that is not a
2571                  * persistent reservation holder. return GOOD status.
2572                  */
2573                 spin_unlock(&dev->dev_reservation_lock);
2574                 goto out_put_pr_reg;
2575         }
2576
2577         /*
2578          * From spc4r17 Section 5.7.11.2 Releasing:
2579          *
2580          * Only the persistent reservation holder (see 5.7.10) is allowed to
2581          * release a persistent reservation.
2582          *
2583          * An application client releases the persistent reservation by issuing
2584          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2585          * an I_T nexus that is a persistent reservation holder with the
2586          * following parameters:
2587          *
2588          *     a) RESERVATION KEY field set to the value of the reservation key
2589          *        that is registered with the logical unit for the I_T nexus;
2590          */
2591         if (res_key != pr_reg->pr_res_key) {
2592                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2593                         " does not match existing SA REGISTER res_key:"
2594                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2595                 spin_unlock(&dev->dev_reservation_lock);
2596                 ret = TCM_RESERVATION_CONFLICT;
2597                 goto out_put_pr_reg;
2598         }
2599         /*
2600          * From spc4r17 Section 5.7.11.2 Releasing and above:
2601          *
2602          * b) TYPE field and SCOPE field set to match the persistent
2603          *    reservation being released.
2604          */
2605         if ((pr_res_holder->pr_res_type != type) ||
2606             (pr_res_holder->pr_res_scope != scope)) {
2607                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2608                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2609                         " reservation from [%s]: %s with different TYPE "
2610                         "and/or SCOPE  while reservation already held by"
2611                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2612                         cmd->se_tfo->get_fabric_name(),
2613                         se_sess->se_node_acl->initiatorname,
2614                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2615                         pr_res_holder->pr_reg_nacl->initiatorname);
2616
2617                 spin_unlock(&dev->dev_reservation_lock);
2618                 ret = TCM_RESERVATION_CONFLICT;
2619                 goto out_put_pr_reg;
2620         }
2621         /*
2622          * In response to a persistent reservation release request from the
2623          * persistent reservation holder the device server shall perform a
2624          * release by doing the following as an uninterrupted series of actions:
2625          * a) Release the persistent reservation;
2626          * b) Not remove any registration(s);
2627          * c) If the released persistent reservation is a registrants only type
2628          * or all registrants type persistent reservation,
2629          *    the device server shall establish a unit attention condition for
2630          *    the initiator port associated with every regis-
2631          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2632          *    RESERVE OUT command with RELEASE service action was received,
2633          *    with the additional sense code set to RESERVATIONS RELEASED; and
2634          * d) If the persistent reservation is of any other type, the device
2635          *    server shall not establish a unit attention condition.
2636          */
2637         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2638                                           pr_reg, 1, 0);
2639
2640         spin_unlock(&dev->dev_reservation_lock);
2641
2642         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2643             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2644             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2645             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2646                 /*
2647                  * If no UNIT ATTENTION conditions will be established for
2648                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2649                  * go ahead and check for APTPL=1 update+write below
2650                  */
2651                 goto write_aptpl;
2652         }
2653
2654         spin_lock(&pr_tmpl->registration_lock);
2655         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2656                         pr_reg_list) {
2657                 /*
2658                  * Do not establish a UNIT ATTENTION condition
2659                  * for the calling I_T Nexus
2660                  */
2661                 if (pr_reg_p == pr_reg)
2662                         continue;
2663
2664                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2665                                 pr_reg_p->pr_res_mapped_lun,
2666                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2667         }
2668         spin_unlock(&pr_tmpl->registration_lock);
2669
2670 write_aptpl:
2671         if (pr_tmpl->pr_aptpl_active)
2672                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2673
2674 out_put_pr_reg:
2675         core_scsi3_put_pr_reg(pr_reg);
2676         return ret;
2677 }
2678
2679 static sense_reason_t
2680 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2681 {
2682         struct se_device *dev = cmd->se_dev;
2683         struct se_node_acl *pr_reg_nacl;
2684         struct se_session *se_sess = cmd->se_sess;
2685         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2686         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2687         u64 pr_res_mapped_lun = 0;
2688         int calling_it_nexus = 0;
2689         /*
2690          * Locate the existing *pr_reg via struct se_node_acl pointers
2691          */
2692         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2693                         se_sess->se_node_acl, se_sess);
2694         if (!pr_reg_n) {
2695                 pr_err("SPC-3 PR: Unable to locate"
2696                         " PR_REGISTERED *pr_reg for CLEAR\n");
2697                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2698         }
2699         /*
2700          * From spc4r17 section 5.7.11.6, Clearing:
2701          *
2702          * Any application client may release the persistent reservation and
2703          * remove all registrations from a device server by issuing a
2704          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2705          * registered I_T nexus with the following parameter:
2706          *
2707          *      a) RESERVATION KEY field set to the value of the reservation key
2708          *         that is registered with the logical unit for the I_T nexus.
2709          */
2710         if (res_key != pr_reg_n->pr_res_key) {
2711                 pr_err("SPC-3 PR REGISTER: Received"
2712                         " res_key: 0x%016Lx does not match"
2713                         " existing SA REGISTER res_key:"
2714                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2715                 core_scsi3_put_pr_reg(pr_reg_n);
2716                 return TCM_RESERVATION_CONFLICT;
2717         }
2718         /*
2719          * a) Release the persistent reservation, if any;
2720          */
2721         spin_lock(&dev->dev_reservation_lock);
2722         pr_res_holder = dev->dev_pr_res_holder;
2723         if (pr_res_holder) {
2724                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2725                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2726                                                   pr_res_holder, 0, 0);
2727         }
2728         spin_unlock(&dev->dev_reservation_lock);
2729         /*
2730          * b) Remove all registration(s) (see spc4r17 5.7.7);
2731          */
2732         spin_lock(&pr_tmpl->registration_lock);
2733         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2734                         &pr_tmpl->registration_list, pr_reg_list) {
2735
2736                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2737                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2738                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2739                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2740                                         calling_it_nexus);
2741                 /*
2742                  * e) Establish a unit attention condition for the initiator
2743                  *    port associated with every registered I_T nexus other
2744                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2745                  *    command with CLEAR service action was received, with the
2746                  *    additional sense code set to RESERVATIONS PREEMPTED.
2747                  */
2748                 if (!calling_it_nexus)
2749                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2750                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2751         }
2752         spin_unlock(&pr_tmpl->registration_lock);
2753
2754         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2755                 cmd->se_tfo->get_fabric_name());
2756
2757         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2758
2759         core_scsi3_pr_generation(dev);
2760         return 0;
2761 }
2762
2763 /*
2764  * Called with struct se_device->dev_reservation_lock held.
2765  */
2766 static void __core_scsi3_complete_pro_preempt(
2767         struct se_device *dev,
2768         struct t10_pr_registration *pr_reg,
2769         struct list_head *preempt_and_abort_list,
2770         int type,
2771         int scope,
2772         enum preempt_type preempt_type)
2773 {
2774         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2775         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2776         char i_buf[PR_REG_ISID_ID_LEN];
2777
2778         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2779         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2780         /*
2781          * Do an implicit RELEASE of the existing reservation.
2782          */
2783         if (dev->dev_pr_res_holder)
2784                 __core_scsi3_complete_pro_release(dev, nacl,
2785                                                   dev->dev_pr_res_holder, 0, 0);
2786
2787         dev->dev_pr_res_holder = pr_reg;
2788         pr_reg->pr_res_holder = 1;
2789         pr_reg->pr_res_type = type;
2790         pr_reg->pr_res_scope = scope;
2791
2792         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2793                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2794                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2795                 core_scsi3_pr_dump_type(type),
2796                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2797         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2798                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2799                 nacl->initiatorname, i_buf);
2800         /*
2801          * For PREEMPT_AND_ABORT, add the preempting reservation's
2802          * struct t10_pr_registration to the list that will be compared
2803          * against received CDBs..
2804          */
2805         if (preempt_and_abort_list)
2806                 list_add_tail(&pr_reg->pr_reg_abort_list,
2807                                 preempt_and_abort_list);
2808 }
2809
2810 static void core_scsi3_release_preempt_and_abort(
2811         struct list_head *preempt_and_abort_list,
2812         struct t10_pr_registration *pr_reg_holder)
2813 {
2814         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2815
2816         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2817                                 pr_reg_abort_list) {
2818
2819                 list_del(&pr_reg->pr_reg_abort_list);
2820                 if (pr_reg_holder == pr_reg)
2821                         continue;
2822                 if (pr_reg->pr_res_holder) {
2823                         pr_warn("pr_reg->pr_res_holder still set\n");
2824                         continue;
2825                 }
2826
2827                 pr_reg->pr_reg_deve = NULL;
2828                 pr_reg->pr_reg_nacl = NULL;
2829                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2830         }
2831 }
2832
2833 static sense_reason_t
2834 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2835                 u64 sa_res_key, enum preempt_type preempt_type)
2836 {
2837         struct se_device *dev = cmd->se_dev;
2838         struct se_node_acl *pr_reg_nacl;
2839         struct se_session *se_sess = cmd->se_sess;
2840         LIST_HEAD(preempt_and_abort_list);
2841         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2842         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2843         u64 pr_res_mapped_lun = 0;
2844         int all_reg = 0, calling_it_nexus = 0;
2845         bool sa_res_key_unmatched = sa_res_key != 0;
2846         int prh_type = 0, prh_scope = 0;
2847
2848         if (!se_sess)
2849                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2850
2851         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2852                                 se_sess);
2853         if (!pr_reg_n) {
2854                 pr_err("SPC-3 PR: Unable to locate"
2855                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2856                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2857                 return TCM_RESERVATION_CONFLICT;
2858         }
2859         if (pr_reg_n->pr_res_key != res_key) {
2860                 core_scsi3_put_pr_reg(pr_reg_n);
2861                 return TCM_RESERVATION_CONFLICT;
2862         }
2863         if (scope != PR_SCOPE_LU_SCOPE) {
2864                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2865                 core_scsi3_put_pr_reg(pr_reg_n);
2866                 return TCM_INVALID_PARAMETER_LIST;
2867         }
2868
2869         spin_lock(&dev->dev_reservation_lock);
2870         pr_res_holder = dev->dev_pr_res_holder;
2871         if (pr_res_holder &&
2872            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2873             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2874                 all_reg = 1;
2875
2876         if (!all_reg && !sa_res_key) {
2877                 spin_unlock(&dev->dev_reservation_lock);
2878                 core_scsi3_put_pr_reg(pr_reg_n);
2879                 return TCM_INVALID_PARAMETER_LIST;
2880         }
2881         /*
2882          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2883          *
2884          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2885          * persistent reservation holder or there is no persistent reservation
2886          * holder (i.e., there is no persistent reservation), then the device
2887          * server shall perform a preempt by doing the following in an
2888          * uninterrupted series of actions. (See below..)
2889          */
2890         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2891                 /*
2892                  * No existing or SA Reservation Key matching reservations..
2893                  *
2894                  * PROUT SA PREEMPT with All Registrant type reservations are
2895                  * allowed to be processed without a matching SA Reservation Key
2896                  */
2897                 spin_lock(&pr_tmpl->registration_lock);
2898                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2899                                 &pr_tmpl->registration_list, pr_reg_list) {
2900                         /*
2901                          * Removing of registrations in non all registrants
2902                          * type reservations without a matching SA reservation
2903                          * key.
2904                          *
2905                          * a) Remove the registrations for all I_T nexuses
2906                          *    specified by the SERVICE ACTION RESERVATION KEY
2907                          *    field;
2908                          * b) Ignore the contents of the SCOPE and TYPE fields;
2909                          * c) Process tasks as defined in 5.7.1; and
2910                          * d) Establish a unit attention condition for the
2911                          *    initiator port associated with every I_T nexus
2912                          *    that lost its registration other than the I_T
2913                          *    nexus on which the PERSISTENT RESERVE OUT command
2914                          *    was received, with the additional sense code set
2915                          *    to REGISTRATIONS PREEMPTED.
2916                          */
2917                         if (!all_reg) {
2918                                 if (pr_reg->pr_res_key != sa_res_key)
2919                                         continue;
2920                                 sa_res_key_unmatched = false;
2921
2922                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2923                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2924                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2925                                 __core_scsi3_free_registration(dev, pr_reg,
2926                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2927                                                 NULL, calling_it_nexus);
2928                         } else {
2929                                 /*
2930                                  * Case for any existing all registrants type
2931                                  * reservation, follow logic in spc4r17 section
2932                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2933                                  *
2934                                  * For a ZERO SA Reservation key, release
2935                                  * all other registrations and do an implicit
2936                                  * release of active persistent reservation.
2937                                  *
2938                                  * For a non-ZERO SA Reservation key, only
2939                                  * release the matching reservation key from
2940                                  * registrations.
2941                                  */
2942                                 if ((sa_res_key) &&
2943                                      (pr_reg->pr_res_key != sa_res_key))
2944                                         continue;
2945                                 sa_res_key_unmatched = false;
2946
2947                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2948                                 if (calling_it_nexus)
2949                                         continue;
2950
2951                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2952                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2953                                 __core_scsi3_free_registration(dev, pr_reg,
2954                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2955                                                 NULL, 0);
2956                         }
2957                         if (!calling_it_nexus)
2958                                 target_ua_allocate_lun(pr_reg_nacl,
2959                                         pr_res_mapped_lun, 0x2A,
2960                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2961                 }
2962                 spin_unlock(&pr_tmpl->registration_lock);
2963                 /*
2964                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2965                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2966                  * RESERVATION KEY field to a value that does not match any
2967                  * registered reservation key, then the device server shall
2968                  * complete the command with RESERVATION CONFLICT status.
2969                  */
2970                 if (sa_res_key_unmatched) {
2971                         spin_unlock(&dev->dev_reservation_lock);
2972                         core_scsi3_put_pr_reg(pr_reg_n);
2973                         return TCM_RESERVATION_CONFLICT;
2974                 }
2975                 /*
2976                  * For an existing all registrants type reservation
2977                  * with a zero SA rservation key, preempt the existing
2978                  * reservation with the new PR type and scope.
2979                  */
2980                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2981                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2982                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2983                                 type, scope, preempt_type);
2984
2985                         if (preempt_type == PREEMPT_AND_ABORT)
2986                                 core_scsi3_release_preempt_and_abort(
2987                                         &preempt_and_abort_list, pr_reg_n);
2988                 }
2989                 spin_unlock(&dev->dev_reservation_lock);
2990
2991                 if (pr_tmpl->pr_aptpl_active)
2992                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2993
2994                 core_scsi3_put_pr_reg(pr_reg_n);
2995                 core_scsi3_pr_generation(cmd->se_dev);
2996                 return 0;
2997         }
2998         /*
2999          * The PREEMPTing SA reservation key matches that of the
3000          * existing persistent reservation, first, we check if
3001          * we are preempting our own reservation.
3002          * From spc4r17, section 5.7.11.4.3 Preempting
3003          * persistent reservations and registration handling
3004          *
3005          * If an all registrants persistent reservation is not
3006          * present, it is not an error for the persistent
3007          * reservation holder to preempt itself (i.e., a
3008          * PERSISTENT RESERVE OUT with a PREEMPT service action
3009          * or a PREEMPT AND ABORT service action with the
3010          * SERVICE ACTION RESERVATION KEY value equal to the
3011          * persistent reservation holder's reservation key that
3012          * is received from the persistent reservation holder).
3013          * In that case, the device server shall establish the
3014          * new persistent reservation and maintain the
3015          * registration.
3016          */
3017         prh_type = pr_res_holder->pr_res_type;
3018         prh_scope = pr_res_holder->pr_res_scope;
3019         /*
3020          * If the SERVICE ACTION RESERVATION KEY field identifies a
3021          * persistent reservation holder (see 5.7.10), the device
3022          * server shall perform a preempt by doing the following as
3023          * an uninterrupted series of actions:
3024          *
3025          * a) Release the persistent reservation for the holder
3026          *    identified by the SERVICE ACTION RESERVATION KEY field;
3027          */
3028         if (pr_reg_n != pr_res_holder)
3029                 __core_scsi3_complete_pro_release(dev,
3030                                                   pr_res_holder->pr_reg_nacl,
3031                                                   dev->dev_pr_res_holder, 0, 0);
3032         /*
3033          * b) Remove the registrations for all I_T nexuses identified
3034          *    by the SERVICE ACTION RESERVATION KEY field, except the
3035          *    I_T nexus that is being used for the PERSISTENT RESERVE
3036          *    OUT command. If an all registrants persistent reservation
3037          *    is present and the SERVICE ACTION RESERVATION KEY field
3038          *    is set to zero, then all registrations shall be removed
3039          *    except for that of the I_T nexus that is being used for
3040          *    the PERSISTENT RESERVE OUT command;
3041          */
3042         spin_lock(&pr_tmpl->registration_lock);
3043         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3044                         &pr_tmpl->registration_list, pr_reg_list) {
3045
3046                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3047                 if (calling_it_nexus)
3048                         continue;
3049
3050                 if (pr_reg->pr_res_key != sa_res_key)
3051                         continue;
3052
3053                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3054                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3055                 __core_scsi3_free_registration(dev, pr_reg,
3056                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3057                                 calling_it_nexus);
3058                 /*
3059                  * e) Establish a unit attention condition for the initiator
3060                  *    port associated with every I_T nexus that lost its
3061                  *    persistent reservation and/or registration, with the
3062                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3063                  */
3064                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3065                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3066         }
3067         spin_unlock(&pr_tmpl->registration_lock);
3068         /*
3069          * c) Establish a persistent reservation for the preempting
3070          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3071          */
3072         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3073                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3074                         type, scope, preempt_type);
3075         /*
3076          * d) Process tasks as defined in 5.7.1;
3077          * e) See above..
3078          * f) If the type or scope has changed, then for every I_T nexus
3079          *    whose reservation key was not removed, except for the I_T
3080          *    nexus on which the PERSISTENT RESERVE OUT command was
3081          *    received, the device server shall establish a unit
3082          *    attention condition for the initiator port associated with
3083          *    that I_T nexus, with the additional sense code set to
3084          *    RESERVATIONS RELEASED. If the type or scope have not
3085          *    changed, then no unit attention condition(s) shall be
3086          *    established for this reason.
3087          */
3088         if ((prh_type != type) || (prh_scope != scope)) {
3089                 spin_lock(&pr_tmpl->registration_lock);
3090                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3091                                 &pr_tmpl->registration_list, pr_reg_list) {
3092
3093                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3094                         if (calling_it_nexus)
3095                                 continue;
3096
3097                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3098                                         pr_reg->pr_res_mapped_lun, 0x2A,
3099                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3100                 }
3101                 spin_unlock(&pr_tmpl->registration_lock);
3102         }
3103         spin_unlock(&dev->dev_reservation_lock);
3104         /*
3105          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3106          * All received CDBs for the matching existing reservation and
3107          * registrations undergo ABORT_TASK logic.
3108          *
3109          * From there, core_scsi3_release_preempt_and_abort() will
3110          * release every registration in the list (which have already
3111          * been removed from the primary pr_reg list), except the
3112          * new persistent reservation holder, the calling Initiator Port.
3113          */
3114         if (preempt_type == PREEMPT_AND_ABORT) {
3115                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3116                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3117                                                 pr_reg_n);
3118         }
3119
3120         if (pr_tmpl->pr_aptpl_active)
3121                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3122
3123         core_scsi3_put_pr_reg(pr_reg_n);
3124         core_scsi3_pr_generation(cmd->se_dev);
3125         return 0;
3126 }
3127
3128 static sense_reason_t
3129 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3130                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3131 {
3132         switch (type) {
3133         case PR_TYPE_WRITE_EXCLUSIVE:
3134         case PR_TYPE_EXCLUSIVE_ACCESS:
3135         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3136         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3137         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3138         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3139                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3140                                               sa_res_key, preempt_type);
3141         default:
3142                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3143                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3144                 return TCM_INVALID_CDB_FIELD;
3145         }
3146 }
3147
3148
3149 static sense_reason_t
3150 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3151                 u64 sa_res_key, int aptpl, int unreg)
3152 {
3153         struct se_session *se_sess = cmd->se_sess;
3154         struct se_device *dev = cmd->se_dev;
3155         struct se_dev_entry *dest_se_deve = NULL;
3156         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3157         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3158         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3159         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3160         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3161         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3162         unsigned char *buf;
3163         const unsigned char *initiator_str;
3164         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3165         u32 tid_len, tmp_tid_len;
3166         int new_reg = 0, type, scope, matching_iname;
3167         sense_reason_t ret;
3168         unsigned short rtpi;
3169         unsigned char proto_ident;
3170
3171         if (!se_sess || !se_lun) {
3172                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3173                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3174         }
3175
3176         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3177         se_tpg = se_sess->se_tpg;
3178         tf_ops = se_tpg->se_tpg_tfo;
3179         /*
3180          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3181          *      Register behaviors for a REGISTER AND MOVE service action
3182          *
3183          * Locate the existing *pr_reg via struct se_node_acl pointers
3184          */
3185         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3186                                 se_sess);
3187         if (!pr_reg) {
3188                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3189                         " *pr_reg for REGISTER_AND_MOVE\n");
3190                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3191         }
3192         /*
3193          * The provided reservation key much match the existing reservation key
3194          * provided during this initiator's I_T nexus registration.
3195          */
3196         if (res_key != pr_reg->pr_res_key) {
3197                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3198                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3199                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3200                 ret = TCM_RESERVATION_CONFLICT;
3201                 goto out_put_pr_reg;
3202         }
3203         /*
3204          * The service active reservation key needs to be non zero
3205          */
3206         if (!sa_res_key) {
3207                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3208                         " sa_res_key\n");
3209                 ret = TCM_INVALID_PARAMETER_LIST;
3210                 goto out_put_pr_reg;
3211         }
3212
3213         /*
3214          * Determine the Relative Target Port Identifier where the reservation
3215          * will be moved to for the TransportID containing SCSI initiator WWN
3216          * information.
3217          */
3218         buf = transport_kmap_data_sg(cmd);
3219         if (!buf) {
3220                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3221                 goto out_put_pr_reg;
3222         }
3223
3224         rtpi = get_unaligned_be16(&buf[18]);
3225         tid_len = get_unaligned_be32(&buf[20]);
3226         transport_kunmap_data_sg(cmd);
3227         buf = NULL;
3228
3229         if ((tid_len + 24) != cmd->data_length) {
3230                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3231                         " does not equal CDB data_length: %u\n", tid_len,
3232                         cmd->data_length);
3233                 ret = TCM_INVALID_PARAMETER_LIST;
3234                 goto out_put_pr_reg;
3235         }
3236
3237         spin_lock(&dev->se_port_lock);
3238         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3239                 if (tmp_lun->lun_rtpi != rtpi)
3240                         continue;
3241                 dest_se_tpg = tmp_lun->lun_tpg;
3242                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3243                 if (!dest_tf_ops)
3244                         continue;
3245
3246                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3247                 spin_unlock(&dev->se_port_lock);
3248
3249                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3250                         pr_err("core_scsi3_tpg_depend_item() failed"
3251                                 " for dest_se_tpg\n");
3252                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3253                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3254                         goto out_put_pr_reg;
3255                 }
3256
3257                 spin_lock(&dev->se_port_lock);
3258                 break;
3259         }
3260         spin_unlock(&dev->se_port_lock);
3261
3262         if (!dest_se_tpg || !dest_tf_ops) {
3263                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3264                         " fabric ops from Relative Target Port Identifier:"
3265                         " %hu\n", rtpi);
3266                 ret = TCM_INVALID_PARAMETER_LIST;
3267                 goto out_put_pr_reg;
3268         }
3269
3270         buf = transport_kmap_data_sg(cmd);
3271         if (!buf) {
3272                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3273                 goto out_put_pr_reg;
3274         }
3275         proto_ident = (buf[24] & 0x0f);
3276
3277         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3278                         " 0x%02x\n", proto_ident);
3279
3280         if (proto_ident != dest_se_tpg->proto_id) {
3281                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3282                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3283                         " from fabric: %s\n", proto_ident,
3284                         dest_se_tpg->proto_id,
3285                         dest_tf_ops->get_fabric_name());
3286                 ret = TCM_INVALID_PARAMETER_LIST;
3287                 goto out;
3288         }
3289         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3290                         &buf[24], &tmp_tid_len, &iport_ptr);
3291         if (!initiator_str) {
3292                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3293                         " initiator_str from Transport ID\n");
3294                 ret = TCM_INVALID_PARAMETER_LIST;
3295                 goto out;
3296         }
3297
3298         transport_kunmap_data_sg(cmd);
3299         buf = NULL;
3300
3301         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3302                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3303                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3304                 iport_ptr : "");
3305         /*
3306          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3307          * action specifies a TransportID that is the same as the initiator port
3308          * of the I_T nexus for the command received, then the command shall
3309          * be terminated with CHECK CONDITION status, with the sense key set to
3310          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3311          * IN PARAMETER LIST.
3312          */
3313         pr_reg_nacl = pr_reg->pr_reg_nacl;
3314         matching_iname = (!strcmp(initiator_str,
3315                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3316         if (!matching_iname)
3317                 goto after_iport_check;
3318
3319         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3320                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3321                         " matches: %s on received I_T Nexus\n", initiator_str,
3322                         pr_reg_nacl->initiatorname);
3323                 ret = TCM_INVALID_PARAMETER_LIST;
3324                 goto out;
3325         }
3326         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3327                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3328                         " matches: %s %s on received I_T Nexus\n",
3329                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3330                         pr_reg->pr_reg_isid);
3331                 ret = TCM_INVALID_PARAMETER_LIST;
3332                 goto out;
3333         }
3334 after_iport_check:
3335         /*
3336          * Locate the destination struct se_node_acl from the received Transport ID
3337          */
3338         mutex_lock(&dest_se_tpg->acl_node_mutex);
3339         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3340                                 initiator_str);
3341         if (dest_node_acl)
3342                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3343         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3344
3345         if (!dest_node_acl) {
3346                 pr_err("Unable to locate %s dest_node_acl for"
3347                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3348                         initiator_str);
3349                 ret = TCM_INVALID_PARAMETER_LIST;
3350                 goto out;
3351         }
3352
3353         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3354                 pr_err("core_scsi3_nodeacl_depend_item() for"
3355                         " dest_node_acl\n");
3356                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3357                 dest_node_acl = NULL;
3358                 ret = TCM_INVALID_PARAMETER_LIST;
3359                 goto out;
3360         }
3361
3362         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3363                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3364                 dest_node_acl->initiatorname);
3365
3366         /*
3367          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3368          * PORT IDENTIFIER.
3369          */
3370         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3371         if (!dest_se_deve) {
3372                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3373                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3374                 ret = TCM_INVALID_PARAMETER_LIST;
3375                 goto out;
3376         }
3377
3378         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3379                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3380                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3381                 dest_se_deve = NULL;
3382                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3383                 goto out;
3384         }
3385
3386         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3387                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3388                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3389                 dest_se_deve->mapped_lun);
3390
3391         /*
3392          * A persistent reservation needs to already existing in order to
3393          * successfully complete the REGISTER_AND_MOVE service action..
3394          */
3395         spin_lock(&dev->dev_reservation_lock);
3396         pr_res_holder = dev->dev_pr_res_holder;
3397         if (!pr_res_holder) {
3398                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3399                         " currently held\n");
3400                 spin_unlock(&dev->dev_reservation_lock);
3401                 ret = TCM_INVALID_CDB_FIELD;
3402                 goto out;
3403         }
3404         /*
3405          * The received on I_T Nexus must be the reservation holder.
3406          *
3407          * From spc4r17 section 5.7.8  Table 50 --
3408          *      Register behaviors for a REGISTER AND MOVE service action
3409          */
3410         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3411                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3412                         " Nexus is not reservation holder\n");
3413                 spin_unlock(&dev->dev_reservation_lock);
3414                 ret = TCM_RESERVATION_CONFLICT;
3415                 goto out;
3416         }
3417         /*
3418          * From spc4r17 section 5.7.8: registering and moving reservation
3419          *
3420          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3421          * action is received and the established persistent reservation is a
3422          * Write Exclusive - All Registrants type or Exclusive Access -
3423          * All Registrants type reservation, then the command shall be completed
3424          * with RESERVATION CONFLICT status.
3425          */
3426         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3427             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3428                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3429                         " reservation for type: %s\n",
3430                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3431                 spin_unlock(&dev->dev_reservation_lock);
3432                 ret = TCM_RESERVATION_CONFLICT;
3433                 goto out;
3434         }
3435         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3436         /*
3437          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3438          */
3439         type = pr_res_holder->pr_res_type;
3440         scope = pr_res_holder->pr_res_type;
3441         /*
3442          * c) Associate the reservation key specified in the SERVICE ACTION
3443          *    RESERVATION KEY field with the I_T nexus specified as the
3444          *    destination of the register and move, where:
3445          *    A) The I_T nexus is specified by the TransportID and the
3446          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3447          *    B) Regardless of the TransportID format used, the association for
3448          *       the initiator port is based on either the initiator port name
3449          *       (see 3.1.71) on SCSI transport protocols where port names are
3450          *       required or the initiator port identifier (see 3.1.70) on SCSI
3451          *       transport protocols where port names are not required;
3452          * d) Register the reservation key specified in the SERVICE ACTION
3453          *    RESERVATION KEY field;
3454          * e) Retain the reservation key specified in the SERVICE ACTION
3455          *    RESERVATION KEY field and associated information;
3456          *
3457          * Also, It is not an error for a REGISTER AND MOVE service action to
3458          * register an I_T nexus that is already registered with the same
3459          * reservation key or a different reservation key.
3460          */
3461         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3462                                         iport_ptr);
3463         if (!dest_pr_reg) {
3464                 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3465                                 kref_read(&dest_se_deve->pr_kref) != 0);
3466
3467                 spin_unlock(&dev->dev_reservation_lock);
3468                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3469                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3470                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3471                         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3472                         goto out;
3473                 }
3474                 spin_lock(&dev->dev_reservation_lock);
3475                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3476                                                 iport_ptr);
3477                 new_reg = 1;
3478         }
3479         /*
3480          * f) Release the persistent reservation for the persistent reservation
3481          *    holder (i.e., the I_T nexus on which the
3482          */
3483         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3484                                           dev->dev_pr_res_holder, 0, 0);
3485         /*
3486          * g) Move the persistent reservation to the specified I_T nexus using
3487          *    the same scope and type as the persistent reservation released in
3488          *    item f); and
3489          */
3490         dev->dev_pr_res_holder = dest_pr_reg;
3491         dest_pr_reg->pr_res_holder = 1;
3492         dest_pr_reg->pr_res_type = type;
3493         pr_reg->pr_res_scope = scope;
3494         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3495         /*
3496          * Increment PRGeneration for existing registrations..
3497          */
3498         if (!new_reg)
3499                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3500         spin_unlock(&dev->dev_reservation_lock);
3501
3502         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3503                 " created new reservation holder TYPE: %s on object RTPI:"
3504                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3505                 core_scsi3_pr_dump_type(type), rtpi,
3506                 dest_pr_reg->pr_res_generation);
3507         pr_debug("SPC-3 PR Successfully moved reservation from"
3508                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3509                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3510                 i_buf, dest_tf_ops->get_fabric_name(),
3511                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3512                 iport_ptr : "");
3513         /*
3514          * It is now safe to release configfs group dependencies for destination
3515          * of Transport ID Initiator Device/Port Identifier
3516          */
3517         core_scsi3_lunacl_undepend_item(dest_se_deve);
3518         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3519         core_scsi3_tpg_undepend_item(dest_se_tpg);
3520         /*
3521          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3522          * nexus on which PERSISTENT RESERVE OUT command was received.
3523          */
3524         if (unreg) {
3525                 spin_lock(&pr_tmpl->registration_lock);
3526                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3527                 spin_unlock(&pr_tmpl->registration_lock);
3528         } else
3529                 core_scsi3_put_pr_reg(pr_reg);
3530
3531         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3532
3533         core_scsi3_put_pr_reg(dest_pr_reg);
3534         return 0;
3535 out:
3536         if (buf)
3537                 transport_kunmap_data_sg(cmd);
3538         if (dest_se_deve)
3539                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3540         if (dest_node_acl)
3541                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3542         core_scsi3_tpg_undepend_item(dest_se_tpg);
3543
3544 out_put_pr_reg:
3545         core_scsi3_put_pr_reg(pr_reg);
3546         return ret;
3547 }
3548
3549 /*
3550  * See spc4r17 section 6.14 Table 170
3551  */
3552 sense_reason_t
3553 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3554 {
3555         struct se_device *dev = cmd->se_dev;
3556         unsigned char *cdb = &cmd->t_task_cdb[0];
3557         unsigned char *buf;
3558         u64 res_key, sa_res_key;
3559         int sa, scope, type, aptpl;
3560         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3561         sense_reason_t ret;
3562
3563         /*
3564          * Following spc2r20 5.5.1 Reservations overview:
3565          *
3566          * If a logical unit has been reserved by any RESERVE command and is
3567          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3568          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3569          * initiator or service action and shall terminate with a RESERVATION
3570          * CONFLICT status.
3571          */
3572         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3573                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3574                         " SPC-2 reservation is held, returning"
3575                         " RESERVATION_CONFLICT\n");
3576                 return TCM_RESERVATION_CONFLICT;
3577         }
3578
3579         /*
3580          * FIXME: A NULL struct se_session pointer means an this is not coming from
3581          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3582          */
3583         if (!cmd->se_sess)
3584                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3585
3586         if (cmd->data_length < 24) {
3587                 pr_warn("SPC-PR: Received PR OUT parameter list"
3588                         " length too small: %u\n", cmd->data_length);
3589                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3590         }
3591
3592         /*
3593          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3594          */
3595         sa = (cdb[1] & 0x1f);
3596         scope = (cdb[2] & 0xf0);
3597         type = (cdb[2] & 0x0f);
3598
3599         buf = transport_kmap_data_sg(cmd);
3600         if (!buf)
3601                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3602
3603         /*
3604          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3605          */
3606         res_key = get_unaligned_be64(&buf[0]);
3607         sa_res_key = get_unaligned_be64(&buf[8]);
3608         /*
3609          * REGISTER_AND_MOVE uses a different SA parameter list containing
3610          * SCSI TransportIDs.
3611          */
3612         if (sa != PRO_REGISTER_AND_MOVE) {
3613                 spec_i_pt = (buf[20] & 0x08);
3614                 all_tg_pt = (buf[20] & 0x04);
3615                 aptpl = (buf[20] & 0x01);
3616         } else {
3617                 aptpl = (buf[17] & 0x01);
3618                 unreg = (buf[17] & 0x02);
3619         }
3620         /*
3621          * If the backend device has been configured to force APTPL metadata
3622          * write-out, go ahead and propigate aptpl=1 down now.
3623          */
3624         if (dev->dev_attrib.force_pr_aptpl)
3625                 aptpl = 1;
3626
3627         transport_kunmap_data_sg(cmd);
3628         buf = NULL;
3629
3630         /*
3631          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3632          */
3633         if (spec_i_pt && (sa != PRO_REGISTER))
3634                 return TCM_INVALID_PARAMETER_LIST;
3635
3636         /*
3637          * From spc4r17 section 6.14:
3638          *
3639          * If the SPEC_I_PT bit is set to zero, the service action is not
3640          * REGISTER AND MOVE, and the parameter list length is not 24, then
3641          * the command shall be terminated with CHECK CONDITION status, with
3642          * the sense key set to ILLEGAL REQUEST, and the additional sense
3643          * code set to PARAMETER LIST LENGTH ERROR.
3644          */
3645         if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
3646             (cmd->data_length != 24)) {
3647                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3648                         " list length: %u\n", cmd->data_length);
3649                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3650         }
3651
3652         /*
3653          * (core_scsi3_emulate_pro_* function parameters
3654          * are defined by spc4r17 Table 174:
3655          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3656          */
3657         switch (sa) {
3658         case PRO_REGISTER:
3659                 ret = core_scsi3_emulate_pro_register(cmd,
3660                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3661                 break;
3662         case PRO_RESERVE:
3663                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3664                 break;
3665         case PRO_RELEASE:
3666                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3667                 break;
3668         case PRO_CLEAR:
3669                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3670                 break;
3671         case PRO_PREEMPT:
3672                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3673                                         res_key, sa_res_key, PREEMPT);
3674                 break;
3675         case PRO_PREEMPT_AND_ABORT:
3676                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3677                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3678                 break;
3679         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3680                 ret = core_scsi3_emulate_pro_register(cmd,
3681                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3682                 break;
3683         case PRO_REGISTER_AND_MOVE:
3684                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3685                                 sa_res_key, aptpl, unreg);
3686                 break;
3687         default:
3688                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3689                         " action: 0x%02x\n", sa);
3690                 return TCM_INVALID_CDB_FIELD;
3691         }
3692
3693         if (!ret)
3694                 target_complete_cmd(cmd, GOOD);
3695         return ret;
3696 }
3697
3698 /*
3699  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3700  *
3701  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3702  */
3703 static sense_reason_t
3704 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3705 {
3706         struct se_device *dev = cmd->se_dev;
3707         struct t10_pr_registration *pr_reg;
3708         unsigned char *buf;
3709         u32 add_len = 0, off = 8;
3710
3711         if (cmd->data_length < 8) {
3712                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3713                         " too small\n", cmd->data_length);
3714                 return TCM_INVALID_CDB_FIELD;
3715         }
3716
3717         buf = transport_kmap_data_sg(cmd);
3718         if (!buf)
3719                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3720
3721         put_unaligned_be32(dev->t10_pr.pr_generation, buf);
3722
3723         spin_lock(&dev->t10_pr.registration_lock);
3724         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3725                         pr_reg_list) {
3726                 /*
3727                  * Check for overflow of 8byte PRI READ_KEYS payload and
3728                  * next reservation key list descriptor.
3729                  */
3730                 if (off + 8 <= cmd->data_length) {
3731                         put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3732                         off += 8;
3733                 }
3734                 /*
3735                  * SPC5r17: 6.16.2 READ KEYS service action
3736                  * The ADDITIONAL LENGTH field indicates the number of bytes in
3737                  * the Reservation key list. The contents of the ADDITIONAL
3738                  * LENGTH field are not altered based on the allocation length
3739                  */
3740                 add_len += 8;
3741         }
3742         spin_unlock(&dev->t10_pr.registration_lock);
3743
3744         put_unaligned_be32(add_len, &buf[4]);
3745
3746         transport_kunmap_data_sg(cmd);
3747
3748         return 0;
3749 }
3750
3751 /*
3752  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3753  *
3754  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3755  */
3756 static sense_reason_t
3757 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3758 {
3759         struct se_device *dev = cmd->se_dev;
3760         struct t10_pr_registration *pr_reg;
3761         unsigned char *buf;
3762         u64 pr_res_key;
3763         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3764
3765         if (cmd->data_length < 8) {
3766                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3767                         " too small\n", cmd->data_length);
3768                 return TCM_INVALID_CDB_FIELD;
3769         }
3770
3771         buf = transport_kmap_data_sg(cmd);
3772         if (!buf)
3773                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3774
3775         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3776
3777         spin_lock(&dev->dev_reservation_lock);
3778         pr_reg = dev->dev_pr_res_holder;
3779         if (pr_reg) {
3780                 /*
3781                  * Set the hardcoded Additional Length
3782                  */
3783                 put_unaligned_be32(add_len, &buf[4]);
3784
3785                 if (cmd->data_length < 22)
3786                         goto err;
3787
3788                 /*
3789                  * Set the Reservation key.
3790                  *
3791                  * From spc4r17, section 5.7.10:
3792                  * A persistent reservation holder has its reservation key
3793                  * returned in the parameter data from a PERSISTENT
3794                  * RESERVE IN command with READ RESERVATION service action as
3795                  * follows:
3796                  * a) For a persistent reservation of the type Write Exclusive
3797                  *    - All Registrants or Exclusive Access  All Regitrants,
3798                  *      the reservation key shall be set to zero; or
3799                  * b) For all other persistent reservation types, the
3800                  *    reservation key shall be set to the registered
3801                  *    reservation key for the I_T nexus that holds the
3802                  *    persistent reservation.
3803                  */
3804                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3805                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3806                         pr_res_key = 0;
3807                 else
3808                         pr_res_key = pr_reg->pr_res_key;
3809
3810                 put_unaligned_be64(pr_res_key, &buf[8]);
3811                 /*
3812                  * Set the SCOPE and TYPE
3813                  */
3814                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3815                           (pr_reg->pr_res_type & 0x0f);
3816         }
3817
3818 err:
3819         spin_unlock(&dev->dev_reservation_lock);
3820         transport_kunmap_data_sg(cmd);
3821
3822         return 0;
3823 }
3824
3825 /*
3826  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3827  *
3828  * See spc4r17 section 6.13.4 Table 165
3829  */
3830 static sense_reason_t
3831 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3832 {
3833         struct se_device *dev = cmd->se_dev;
3834         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3835         unsigned char *buf;
3836         u16 add_len = 8; /* Hardcoded to 8. */
3837
3838         if (cmd->data_length < 6) {
3839                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3840                         " %u too small\n", cmd->data_length);
3841                 return TCM_INVALID_CDB_FIELD;
3842         }
3843
3844         buf = transport_kmap_data_sg(cmd);
3845         if (!buf)
3846                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3847
3848         put_unaligned_be16(add_len, &buf[0]);
3849         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3850         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3851         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3852         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3853         /*
3854          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3855          * set the TMV: Task Mask Valid bit.
3856          */
3857         buf[3] |= 0x80;
3858         /*
3859          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3860          */
3861         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3862         /*
3863          * PTPL_A: Persistence across Target Power Loss Active bit
3864          */
3865         if (pr_tmpl->pr_aptpl_active)
3866                 buf[3] |= 0x01;
3867         /*
3868          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3869          */
3870         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3871         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3872         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3873         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3874         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3875         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3876
3877         transport_kunmap_data_sg(cmd);
3878
3879         return 0;
3880 }
3881
3882 /*
3883  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3884  *
3885  * See spc4r17 section 6.13.5 Table 168 and 169
3886  */
3887 static sense_reason_t
3888 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3889 {
3890         struct se_device *dev = cmd->se_dev;
3891         struct se_node_acl *se_nacl;
3892         struct se_portal_group *se_tpg;
3893         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3894         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3895         unsigned char *buf;
3896         u32 add_desc_len = 0, add_len = 0;
3897         u32 off = 8; /* off into first Full Status descriptor */
3898         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3899         int exp_desc_len, desc_len;
3900         bool all_reg = false;
3901
3902         if (cmd->data_length < 8) {
3903                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3904                         " too small\n", cmd->data_length);
3905                 return TCM_INVALID_CDB_FIELD;
3906         }
3907
3908         buf = transport_kmap_data_sg(cmd);
3909         if (!buf)
3910                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3911
3912         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3913
3914         spin_lock(&dev->dev_reservation_lock);
3915         if (dev->dev_pr_res_holder) {
3916                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3917
3918                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3919                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3920                         all_reg = true;
3921                         pr_res_type = pr_holder->pr_res_type;
3922                         pr_res_scope = pr_holder->pr_res_scope;
3923                 }
3924         }
3925         spin_unlock(&dev->dev_reservation_lock);
3926
3927         spin_lock(&pr_tmpl->registration_lock);
3928         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3929                         &pr_tmpl->registration_list, pr_reg_list) {
3930
3931                 se_nacl = pr_reg->pr_reg_nacl;
3932                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3933                 add_desc_len = 0;
3934
3935                 atomic_inc_mb(&pr_reg->pr_res_holders);
3936                 spin_unlock(&pr_tmpl->registration_lock);
3937                 /*
3938                  * Determine expected length of $FABRIC_MOD specific
3939                  * TransportID full status descriptor..
3940                  */
3941                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3942                                         &format_code);
3943                 if (exp_desc_len < 0 ||
3944                     exp_desc_len + add_len > cmd->data_length) {
3945                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3946                                 " out of buffer: %d\n", cmd->data_length);
3947                         spin_lock(&pr_tmpl->registration_lock);
3948                         atomic_dec_mb(&pr_reg->pr_res_holders);
3949                         break;
3950                 }
3951                 /*
3952                  * Set RESERVATION KEY
3953                  */
3954                 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3955                 off += 8;
3956                 off += 4; /* Skip Over Reserved area */
3957
3958                 /*
3959                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3960                  */
3961                 if (pr_reg->pr_reg_all_tg_pt)
3962                         buf[off] = 0x02;
3963                 /*
3964                  * The struct se_lun pointer will be present for the
3965                  * reservation holder for PR_HOLDER bit.
3966                  *
3967                  * Also, if this registration is the reservation
3968                  * holder or there is an All Registrants reservation
3969                  * active, fill in SCOPE and TYPE in the next byte.
3970                  */
3971                 if (pr_reg->pr_res_holder) {
3972                         buf[off++] |= 0x01;
3973                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3974                                      (pr_reg->pr_res_type & 0x0f);
3975                 } else if (all_reg) {
3976                         buf[off++] |= 0x01;
3977                         buf[off++] = (pr_res_scope & 0xf0) |
3978                                      (pr_res_type & 0x0f);
3979                 } else {
3980                         off += 2;
3981                 }
3982
3983                 off += 4; /* Skip over reserved area */
3984                 /*
3985                  * From spc4r17 6.3.15:
3986                  *
3987                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3988                  * IDENTIFIER field contains the relative port identifier (see
3989                  * 3.1.120) of the target port that is part of the I_T nexus
3990                  * described by this full status descriptor. If the ALL_TG_PT
3991                  * bit is set to one, the contents of the RELATIVE TARGET PORT
3992                  * IDENTIFIER field are not defined by this standard.
3993                  */
3994                 if (!pr_reg->pr_reg_all_tg_pt) {
3995                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
3996
3997                         put_unaligned_be16(sep_rtpi, &buf[off]);
3998                         off += 2;
3999                 } else
4000                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4001
4002                 buf[off+4] = se_tpg->proto_id;
4003
4004                 /*
4005                  * Now, have the $FABRIC_MOD fill in the transport ID.
4006                  */
4007                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4008                                 &format_code, &buf[off+4]);
4009
4010                 spin_lock(&pr_tmpl->registration_lock);
4011                 atomic_dec_mb(&pr_reg->pr_res_holders);
4012
4013                 if (desc_len < 0)
4014                         break;
4015                 /*
4016                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4017                  */
4018                 put_unaligned_be32(desc_len, &buf[off]);
4019                 off += 4;
4020                 /*
4021                  * Size of full desctipor header minus TransportID
4022                  * containing $FABRIC_MOD specific) initiator device/port
4023                  * WWN information.
4024                  *
4025                  *  See spc4r17 Section 6.13.5 Table 169
4026                  */
4027                 add_desc_len = (24 + desc_len);
4028
4029                 off += desc_len;
4030                 add_len += add_desc_len;
4031         }
4032         spin_unlock(&pr_tmpl->registration_lock);
4033         /*
4034          * Set ADDITIONAL_LENGTH
4035          */
4036         put_unaligned_be32(add_len, &buf[4]);
4037
4038         transport_kunmap_data_sg(cmd);
4039
4040         return 0;
4041 }
4042
4043 sense_reason_t
4044 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4045 {
4046         sense_reason_t ret;
4047
4048         /*
4049          * Following spc2r20 5.5.1 Reservations overview:
4050          *
4051          * If a logical unit has been reserved by any RESERVE command and is
4052          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4053          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4054          * initiator or service action and shall terminate with a RESERVATION
4055          * CONFLICT status.
4056          */
4057         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4058                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4059                         " SPC-2 reservation is held, returning"
4060                         " RESERVATION_CONFLICT\n");
4061                 return TCM_RESERVATION_CONFLICT;
4062         }
4063
4064         switch (cmd->t_task_cdb[1] & 0x1f) {
4065         case PRI_READ_KEYS:
4066                 ret = core_scsi3_pri_read_keys(cmd);
4067                 break;
4068         case PRI_READ_RESERVATION:
4069                 ret = core_scsi3_pri_read_reservation(cmd);
4070                 break;
4071         case PRI_REPORT_CAPABILITIES:
4072                 ret = core_scsi3_pri_report_capabilities(cmd);
4073                 break;
4074         case PRI_READ_FULL_STATUS:
4075                 ret = core_scsi3_pri_read_full_status(cmd);
4076                 break;
4077         default:
4078                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4079                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4080                 return TCM_INVALID_CDB_FIELD;
4081         }
4082
4083         if (!ret)
4084                 target_complete_cmd(cmd, GOOD);
4085         return ret;
4086 }
4087
4088 sense_reason_t
4089 target_check_reservation(struct se_cmd *cmd)
4090 {
4091         struct se_device *dev = cmd->se_dev;
4092         sense_reason_t ret;
4093
4094         if (!cmd->se_sess)
4095                 return 0;
4096         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4097                 return 0;
4098         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
4099                 return 0;
4100
4101         spin_lock(&dev->dev_reservation_lock);
4102         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4103                 ret = target_scsi2_reservation_check(cmd);
4104         else
4105                 ret = target_scsi3_pr_reservation_check(cmd);
4106         spin_unlock(&dev->dev_reservation_lock);
4107
4108         return ret;
4109 }