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 <scsi/scsi_proto.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38
  39 #include "target_core_internal.h"
  40 #include "target_core_pr.h"
  41 #include "target_core_ua.h"
  42
  43 /*
  44  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  45  */
  46 struct pr_transport_id_holder {
  47         struct t10_pr_registration *dest_pr_reg;
  48         struct se_portal_group *dest_tpg;
  49         struct se_node_acl *dest_node_acl;
  50         struct se_dev_entry *dest_se_deve;
  51         struct list_head dest_list;
  52 };
  53
  54 void core_pr_dump_initiator_port(
  55         struct t10_pr_registration *pr_reg,
  56         char *buf,
  57         u32 size)
  58 {
  59         if (!pr_reg->isid_present_at_reg) {
  60                 buf[0] = '\0';
  61                 return;
  62         }
  63
  64         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  65 }
  66
  67 enum register_type {
  68         REGISTER,
  69         REGISTER_AND_IGNORE_EXISTING_KEY,
  70         REGISTER_AND_MOVE,
  71 };
  72
  73 enum preempt_type {
  74         PREEMPT,
  75         PREEMPT_AND_ABORT,
  76 };
  77
  78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  79                                               struct t10_pr_registration *, int, int);
  80
  81 static int is_reservation_holder(
  82         struct t10_pr_registration *pr_res_holder,
  83         struct t10_pr_registration *pr_reg)
  84 {
  85         int pr_res_type;
  86
  87         if (pr_res_holder) {
  88                 pr_res_type = pr_res_holder->pr_res_type;
  89
  90                 return pr_res_holder == pr_reg ||
  91                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  92                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  93         }
  94         return 0;
  95 }
  96
  97 static sense_reason_t
  98 target_scsi2_reservation_check(struct se_cmd *cmd)
  99 {
 100         struct se_device *dev = cmd->se_dev;
 101         struct se_session *sess = cmd->se_sess;
 102
 103         switch (cmd->t_task_cdb[0]) {
 104         case INQUIRY:
 105         case RELEASE:
 106         case RELEASE_10:
 107                 return 0;
 108         default:
 109                 break;
 110         }
 111
 112         if (!dev->dev_reserved_node_acl || !sess)
 113                 return 0;
 114
 115         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 116                 return TCM_RESERVATION_CONFLICT;
 117
 118         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 119                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 120                         return TCM_RESERVATION_CONFLICT;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 127                                         struct se_node_acl *, struct se_session *);
 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 129
 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 131 {
 132         struct se_session *se_sess = cmd->se_sess;
 133         struct se_device *dev = cmd->se_dev;
 134         struct t10_pr_registration *pr_reg;
 135         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 136         int conflict = 0;
 137
 138         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 139                         se_sess);
 140         if (pr_reg) {
 141                 /*
 142                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 143                  * behavior
 144                  *
 145                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 146                  * status, but no reservation shall be established and the
 147                  * persistent reservation shall not be changed, if the command
 148                  * is received from a) and b) below.
 149                  *
 150                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 151                  * status, but the persistent reservation shall not be released,
 152                  * if the command is received from a) and b)
 153                  *
 154                  * a) An I_T nexus that is a persistent reservation holder; or
 155                  * b) An I_T nexus that is registered if a registrants only or
 156                  *    all registrants type persistent reservation is present.
 157                  *
 158                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 159                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 160                  * as defined in SPC-2.
 161                  */
 162                 if (pr_reg->pr_res_holder) {
 163                         core_scsi3_put_pr_reg(pr_reg);
 164                         return 1;
 165                 }
 166                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 168                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 169                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 170                         core_scsi3_put_pr_reg(pr_reg);
 171                         return 1;
 172                 }
 173                 core_scsi3_put_pr_reg(pr_reg);
 174                 conflict = 1;
 175         } else {
 176                 /*
 177                  * Following spc2r20 5.5.1 Reservations overview:
 178                  *
 179                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 180                  * command with the REGISTER or the REGISTER AND IGNORE
 181                  * EXISTING KEY service action and is still registered by any
 182                  * initiator, all RESERVE commands and all RELEASE commands
 183                  * regardless of initiator shall conflict and shall terminate
 184                  * with a RESERVATION CONFLICT status.
 185                  */
 186                 spin_lock(&pr_tmpl->registration_lock);
 187                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 188                 spin_unlock(&pr_tmpl->registration_lock);
 189         }
 190
 191         if (conflict) {
 192                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 193                         " while active SPC-3 registrations exist,"
 194                         " returning RESERVATION_CONFLICT\n");
 195                 return -EBUSY;
 196         }
 197
 198         return 0;
 199 }
 200
 201 sense_reason_t
 202 target_scsi2_reservation_release(struct se_cmd *cmd)
 203 {
 204         struct se_device *dev = cmd->se_dev;
 205         struct se_session *sess = cmd->se_sess;
 206         struct se_portal_group *tpg;
 207         int rc;
 208
 209         if (!sess || !sess->se_tpg)
 210                 goto out;
 211         rc = target_check_scsi2_reservation_conflict(cmd);
 212         if (rc == 1)
 213                 goto out;
 214         if (rc < 0)
 215                 return TCM_RESERVATION_CONFLICT;
 216
 217         spin_lock(&dev->dev_reservation_lock);
 218         if (!dev->dev_reserved_node_acl || !sess)
 219                 goto out_unlock;
 220
 221         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 222                 goto out_unlock;
 223
 224         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 225                 goto out_unlock;
 226
 227         dev->dev_reserved_node_acl = NULL;
 228         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 229         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 230                 dev->dev_res_bin_isid = 0;
 231                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 232         }
 233         tpg = sess->se_tpg;
 234         pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
 235                 " MAPPED LUN: %llu for %s\n",
 236                 tpg->se_tpg_tfo->get_fabric_name(),
 237                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 238                 sess->se_node_acl->initiatorname);
 239
 240 out_unlock:
 241         spin_unlock(&dev->dev_reservation_lock);
 242 out:
 243         target_complete_cmd(cmd, GOOD);
 244         return 0;
 245 }
 246
 247 sense_reason_t
 248 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 249 {
 250         struct se_device *dev = cmd->se_dev;
 251         struct se_session *sess = cmd->se_sess;
 252         struct se_portal_group *tpg;
 253         sense_reason_t ret = 0;
 254         int rc;
 255
 256         if ((cmd->t_task_cdb[1] & 0x01) &&
 257             (cmd->t_task_cdb[1] & 0x02)) {
 258                 pr_err("LongIO and Obselete Bits set, returning"
 259                                 " ILLEGAL_REQUEST\n");
 260                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 261         }
 262         /*
 263          * This is currently the case for target_core_mod passthrough struct se_cmd
 264          * ops
 265          */
 266         if (!sess || !sess->se_tpg)
 267                 goto out;
 268         rc = target_check_scsi2_reservation_conflict(cmd);
 269         if (rc == 1)
 270                 goto out;
 271
 272         if (rc < 0)
 273                 return TCM_RESERVATION_CONFLICT;
 274
 275         tpg = sess->se_tpg;
 276         spin_lock(&dev->dev_reservation_lock);
 277         if (dev->dev_reserved_node_acl &&
 278            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 279                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 280                         tpg->se_tpg_tfo->get_fabric_name());
 281                 pr_err("Original reserver LUN: %llu %s\n",
 282                         cmd->se_lun->unpacked_lun,
 283                         dev->dev_reserved_node_acl->initiatorname);
 284                 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
 285                         " from %s \n", cmd->se_lun->unpacked_lun,
 286                         cmd->orig_fe_lun,
 287                         sess->se_node_acl->initiatorname);
 288                 ret = TCM_RESERVATION_CONFLICT;
 289                 goto out_unlock;
 290         }
 291
 292         dev->dev_reserved_node_acl = sess->se_node_acl;
 293         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 294         if (sess->sess_bin_isid != 0) {
 295                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 296                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 297         }
 298         pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
 299                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 300                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 301                 sess->se_node_acl->initiatorname);
 302
 303 out_unlock:
 304         spin_unlock(&dev->dev_reservation_lock);
 305 out:
 306         if (!ret)
 307                 target_complete_cmd(cmd, GOOD);
 308         return ret;
 309 }
 310
 311
 312 /*
 313  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 314  *
 315  * This function is called by those initiator ports who are *NOT*
 316  * the active PR reservation holder when a reservation is present.
 317  */
 318 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 319                                         bool isid_mismatch)
 320 {
 321         unsigned char *cdb = cmd->t_task_cdb;
 322         struct se_session *se_sess = cmd->se_sess;
 323         struct se_node_acl *nacl = se_sess->se_node_acl;
 324         int other_cdb = 0;
 325         int registered_nexus = 0, ret = 1; /* Conflict by default */
 326         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 327         int we = 0; /* Write Exclusive */
 328         int legacy = 0; /* Act like a legacy device and return
 329                          * RESERVATION CONFLICT on some CDBs */
 330
 331         if (isid_mismatch) {
 332                 registered_nexus = 0;
 333         } else {
 334                 struct se_dev_entry *se_deve;
 335
 336                 rcu_read_lock();
 337                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 338                 if (se_deve)
 339                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 340                                                     &se_deve->deve_flags);
 341                 rcu_read_unlock();
 342         }
 343
 344         switch (pr_reg_type) {
 345         case PR_TYPE_WRITE_EXCLUSIVE:
 346                 we = 1;
 347         case PR_TYPE_EXCLUSIVE_ACCESS:
 348                 /*
 349                  * Some commands are only allowed for the persistent reservation
 350                  * holder.
 351                  */
 352                 break;
 353         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 354                 we = 1;
 355         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 356                 /*
 357                  * Some commands are only allowed for registered I_T Nexuses.
 358                  */
 359                 reg_only = 1;
 360                 break;
 361         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 362                 we = 1;
 363         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 364                 /*
 365                  * Each registered I_T Nexus is a reservation holder.
 366                  */
 367                 all_reg = 1;
 368                 break;
 369         default:
 370                 return -EINVAL;
 371         }
 372         /*
 373          * Referenced from spc4r17 table 45 for *NON* PR holder access
 374          */
 375         switch (cdb[0]) {
 376         case SECURITY_PROTOCOL_IN:
 377                 if (registered_nexus)
 378                         return 0;
 379                 ret = (we) ? 0 : 1;
 380                 break;
 381         case MODE_SENSE:
 382         case MODE_SENSE_10:
 383         case READ_ATTRIBUTE:
 384         case READ_BUFFER:
 385         case RECEIVE_DIAGNOSTIC:
 386                 if (legacy) {
 387                         ret = 1;
 388                         break;
 389                 }
 390                 if (registered_nexus) {
 391                         ret = 0;
 392                         break;
 393                 }
 394                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 395                 break;
 396         case PERSISTENT_RESERVE_OUT:
 397                 /*
 398                  * This follows PERSISTENT_RESERVE_OUT service actions that
 399                  * are allowed in the presence of various reservations.
 400                  * See spc4r17, table 46
 401                  */
 402                 switch (cdb[1] & 0x1f) {
 403                 case PRO_CLEAR:
 404                 case PRO_PREEMPT:
 405                 case PRO_PREEMPT_AND_ABORT:
 406                         ret = (registered_nexus) ? 0 : 1;
 407                         break;
 408                 case PRO_REGISTER:
 409                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 410                         ret = 0;
 411                         break;
 412                 case PRO_REGISTER_AND_MOVE:
 413                 case PRO_RESERVE:
 414                         ret = 1;
 415                         break;
 416                 case PRO_RELEASE:
 417                         ret = (registered_nexus) ? 0 : 1;
 418                         break;
 419                 default:
 420                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 421                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 422                         return -EINVAL;
 423                 }
 424                 break;
 425         case RELEASE:
 426         case RELEASE_10:
 427                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 428                 ret = 0;
 429                 break;
 430         case RESERVE:
 431         case RESERVE_10:
 432                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 433                 ret = 0;
 434                 break;
 435         case TEST_UNIT_READY:
 436                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 437                 break;
 438         case MAINTENANCE_IN:
 439                 switch (cdb[1] & 0x1f) {
 440                 case MI_MANAGEMENT_PROTOCOL_IN:
 441                         if (registered_nexus) {
 442                                 ret = 0;
 443                                 break;
 444                         }
 445                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 446                         break;
 447                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 448                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 449                         if (legacy) {
 450                                 ret = 1;
 451                                 break;
 452                         }
 453                         if (registered_nexus) {
 454                                 ret = 0;
 455                                 break;
 456                         }
 457                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 458                         break;
 459                 case MI_REPORT_ALIASES:
 460                 case MI_REPORT_IDENTIFYING_INFORMATION:
 461                 case MI_REPORT_PRIORITY:
 462                 case MI_REPORT_TARGET_PGS:
 463                 case MI_REPORT_TIMESTAMP:
 464                         ret = 0; /* Allowed */
 465                         break;
 466                 default:
 467                         pr_err("Unknown MI Service Action: 0x%02x\n",
 468                                 (cdb[1] & 0x1f));
 469                         return -EINVAL;
 470                 }
 471                 break;
 472         case ACCESS_CONTROL_IN:
 473         case ACCESS_CONTROL_OUT:
 474         case INQUIRY:
 475         case LOG_SENSE:
 476         case SERVICE_ACTION_IN_12:
 477         case REPORT_LUNS:
 478         case REQUEST_SENSE:
 479         case PERSISTENT_RESERVE_IN:
 480                 ret = 0; /*/ Allowed CDBs */
 481                 break;
 482         default:
 483                 other_cdb = 1;
 484                 break;
 485         }
 486         /*
 487          * Case where the CDB is explicitly allowed in the above switch
 488          * statement.
 489          */
 490         if (!ret && !other_cdb) {
 491                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 492                         " reservation holder\n", cdb[0],
 493                         core_scsi3_pr_dump_type(pr_reg_type));
 494
 495                 return ret;
 496         }
 497         /*
 498          * Check if write exclusive initiator ports *NOT* holding the
 499          * WRITE_EXCLUSIVE_* reservation.
 500          */
 501         if (we && !registered_nexus) {
 502                 if (cmd->data_direction == DMA_TO_DEVICE) {
 503                         /*
 504                          * Conflict for write exclusive
 505                          */
 506                         pr_debug("%s Conflict for unregistered nexus"
 507                                 " %s CDB: 0x%02x to %s reservation\n",
 508                                 transport_dump_cmd_direction(cmd),
 509                                 se_sess->se_node_acl->initiatorname, cdb[0],
 510                                 core_scsi3_pr_dump_type(pr_reg_type));
 511                         return 1;
 512                 } else {
 513                         /*
 514                          * Allow non WRITE CDBs for all Write Exclusive
 515                          * PR TYPEs to pass for registered and
 516                          * non-registered_nexuxes NOT holding the reservation.
 517                          *
 518                          * We only make noise for the unregisterd nexuses,
 519                          * as we expect registered non-reservation holding
 520                          * nexuses to issue CDBs.
 521                          */
 522
 523                         if (!registered_nexus) {
 524                                 pr_debug("Allowing implicit CDB: 0x%02x"
 525                                         " for %s reservation on unregistered"
 526                                         " nexus\n", cdb[0],
 527                                         core_scsi3_pr_dump_type(pr_reg_type));
 528                         }
 529
 530                         return 0;
 531                 }
 532         } else if ((reg_only) || (all_reg)) {
 533                 if (registered_nexus) {
 534                         /*
 535                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 536                          * allow commands from registered nexuses.
 537                          */
 538
 539                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 540                                 " reservation\n", cdb[0],
 541                                 core_scsi3_pr_dump_type(pr_reg_type));
 542
 543                         return 0;
 544                 }
 545        } else if (we && registered_nexus) {
 546                /*
 547                 * Reads are allowed for Write Exclusive locks
 548                 * from all registrants.
 549                 */
 550                if (cmd->data_direction == DMA_FROM_DEVICE) {
 551                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 552                                " reservation\n", cdb[0],
 553                                core_scsi3_pr_dump_type(pr_reg_type));
 554
 555                        return 0;
 556                }
 557         }
 558         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 559                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 560                 (registered_nexus) ? "" : "un",
 561                 se_sess->se_node_acl->initiatorname, cdb[0],
 562                 core_scsi3_pr_dump_type(pr_reg_type));
 563
 564         return 1; /* Conflict by default */
 565 }
 566
 567 static sense_reason_t
 568 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 569 {
 570         struct se_device *dev = cmd->se_dev;
 571         struct se_session *sess = cmd->se_sess;
 572         u32 pr_reg_type;
 573         bool isid_mismatch = false;
 574
 575         if (!dev->dev_pr_res_holder)
 576                 return 0;
 577
 578         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 579         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 580         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 581                 goto check_nonholder;
 582
 583         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 584                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 585                     sess->sess_bin_isid) {
 586                         isid_mismatch = true;
 587                         goto check_nonholder;
 588                 }
 589         }
 590
 591         return 0;
 592
 593 check_nonholder:
 594         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 595                 return TCM_RESERVATION_CONFLICT;
 596         return 0;
 597 }
 598
 599 static u32 core_scsi3_pr_generation(struct se_device *dev)
 600 {
 601         u32 prg;
 602
 603         /*
 604          * PRGeneration field shall contain the value of a 32-bit wrapping
 605          * counter mainted by the device server.
 606          *
 607          * Note that this is done regardless of Active Persist across
 608          * Target PowerLoss (APTPL)
 609          *
 610          * See spc4r17 section 6.3.12 READ_KEYS service action
 611          */
 612         spin_lock(&dev->dev_reservation_lock);
 613         prg = dev->t10_pr.pr_generation++;
 614         spin_unlock(&dev->dev_reservation_lock);
 615
 616         return prg;
 617 }
 618
 619 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 620         struct se_device *dev,
 621         struct se_node_acl *nacl,
 622         struct se_lun *lun,
 623         struct se_dev_entry *dest_deve,
 624         u64 mapped_lun,
 625         unsigned char *isid,
 626         u64 sa_res_key,
 627         int all_tg_pt,
 628         int aptpl)
 629 {
 630         struct t10_pr_registration *pr_reg;
 631
 632         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 633         if (!pr_reg) {
 634                 pr_err("Unable to allocate struct t10_pr_registration\n");
 635                 return NULL;
 636         }
 637
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 640         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 641         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 642         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 643         atomic_set(&pr_reg->pr_res_holders, 0);
 644         pr_reg->pr_reg_nacl = nacl;
 645         /*
 646          * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
 647          * the se_dev_entry->pr_ref will have been already obtained by
 648          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 649          *
 650          * Otherwise, locate se_dev_entry now and obtain a reference until
 651          * registration completes in __core_scsi3_add_registration().
 652          */
 653         if (dest_deve) {
 654                 pr_reg->pr_reg_deve = dest_deve;
 655         } else {
 656                 rcu_read_lock();
 657                 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 658                 if (!pr_reg->pr_reg_deve) {
 659                         rcu_read_unlock();
 660                         pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
 661                                 nacl->initiatorname, mapped_lun);
 662                         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 663                         return NULL;
 664                 }
 665                 kref_get(&pr_reg->pr_reg_deve->pr_kref);
 666                 rcu_read_unlock();
 667         }
 668         pr_reg->pr_res_mapped_lun = mapped_lun;
 669         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 670         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 671         pr_reg->pr_res_key = sa_res_key;
 672         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 673         pr_reg->pr_reg_aptpl = aptpl;
 674         /*
 675          * If an ISID value for this SCSI Initiator Port exists,
 676          * save it to the registration now.
 677          */
 678         if (isid != NULL) {
 679                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 680                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 681                 pr_reg->isid_present_at_reg = 1;
 682         }
 683
 684         return pr_reg;
 685 }
 686
 687 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 688 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 689
 690 /*
 691  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 692  * modes.
 693  */
 694 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 695         struct se_device *dev,
 696         struct se_node_acl *nacl,
 697         struct se_lun *lun,
 698         struct se_dev_entry *deve,
 699         u64 mapped_lun,
 700         unsigned char *isid,
 701         u64 sa_res_key,
 702         int all_tg_pt,
 703         int aptpl)
 704 {
 705         struct se_dev_entry *deve_tmp;
 706         struct se_node_acl *nacl_tmp;
 707         struct se_lun_acl *lacl_tmp;
 708         struct se_lun *lun_tmp, *next, *dest_lun;
 709         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 710         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 711         int ret;
 712         /*
 713          * Create a registration for the I_T Nexus upon which the
 714          * PROUT REGISTER was received.
 715          */
 716         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 717                                                     isid, sa_res_key, all_tg_pt,
 718                                                     aptpl);
 719         if (!pr_reg)
 720                 return NULL;
 721         /*
 722          * Return pointer to pr_reg for ALL_TG_PT=0
 723          */
 724         if (!all_tg_pt)
 725                 return pr_reg;
 726         /*
 727          * Create list of matching SCSI Initiator Port registrations
 728          * for ALL_TG_PT=1
 729          */
 730         spin_lock(&dev->se_port_lock);
 731         list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
 732                 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
 733                         continue;
 734                 spin_unlock(&dev->se_port_lock);
 735
 736                 spin_lock(&lun_tmp->lun_deve_lock);
 737                 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 738                         /*
 739                          * This pointer will be NULL for demo mode MappedLUNs
 740                          * that have not been make explicit via a ConfigFS
 741                          * MappedLUN group for the SCSI Initiator Node ACL.
 742                          */
 743                         if (!deve_tmp->se_lun_acl)
 744                                 continue;
 745
 746                         lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
 747                                                 lockdep_is_held(&lun_tmp->lun_deve_lock));
 748                         nacl_tmp = lacl_tmp->se_lun_nacl;
 749                         /*
 750                          * Skip the matching struct se_node_acl that is allocated
 751                          * above..
 752                          */
 753                         if (nacl == nacl_tmp)
 754                                 continue;
 755                         /*
 756                          * Only perform PR registrations for target ports on
 757                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 758                          * arrived.
 759                          */
 760                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 761                                 continue;
 762                         /*
 763                          * Look for a matching Initiator Node ACL in ASCII format
 764                          */
 765                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 766                                 continue;
 767
 768                         kref_get(&deve_tmp->pr_kref);
 769                         spin_unlock(&lun_tmp->lun_deve_lock);
 770                         /*
 771                          * Grab a configfs group dependency that is released
 772                          * for the exception path at label out: below, or upon
 773                          * completion of adding ALL_TG_PT=1 registrations in
 774                          * __core_scsi3_add_registration()
 775                          */
 776                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 777                         if (ret < 0) {
 778                                 pr_err("core_scsi3_lunacl_depend"
 779                                                 "_item() failed\n");
 780                                 percpu_ref_put(&lun_tmp->lun_ref);
 781                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 782                                 goto out;
 783                         }
 784                         /*
 785                          * Located a matching SCSI Initiator Port on a different
 786                          * port, allocate the pr_reg_atp and attach it to the
 787                          * pr_reg->pr_reg_atp_list that will be processed once
 788                          * the original *pr_reg is processed in
 789                          * __core_scsi3_add_registration()
 790                          */
 791                         dest_lun = rcu_dereference_check(deve_tmp->se_lun,
 792                                 atomic_read(&deve_tmp->pr_kref.refcount) != 0);
 793
 794                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 795                                                 nacl_tmp, dest_lun, deve_tmp,
 796                                                 deve_tmp->mapped_lun, NULL,
 797                                                 sa_res_key, all_tg_pt, aptpl);
 798                         if (!pr_reg_atp) {
 799                                 percpu_ref_put(&lun_tmp->lun_ref);
 800                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 801                                 goto out;
 802                         }
 803
 804                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 805                                       &pr_reg->pr_reg_atp_list);
 806                         spin_lock(&lun_tmp->lun_deve_lock);
 807                 }
 808                 spin_unlock(&lun_tmp->lun_deve_lock);
 809
 810                 spin_lock(&dev->se_port_lock);
 811                 percpu_ref_put(&lun_tmp->lun_ref);
 812         }
 813         spin_unlock(&dev->se_port_lock);
 814
 815         return pr_reg;
 816 out:
 817         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 818                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 819                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 820                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 821                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 822         }
 823         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 824         return NULL;
 825 }
 826
 827 int core_scsi3_alloc_aptpl_registration(
 828         struct t10_reservation *pr_tmpl,
 829         u64 sa_res_key,
 830         unsigned char *i_port,
 831         unsigned char *isid,
 832         u64 mapped_lun,
 833         unsigned char *t_port,
 834         u16 tpgt,
 835         u64 target_lun,
 836         int res_holder,
 837         int all_tg_pt,
 838         u8 type)
 839 {
 840         struct t10_pr_registration *pr_reg;
 841
 842         if (!i_port || !t_port || !sa_res_key) {
 843                 pr_err("Illegal parameters for APTPL registration\n");
 844                 return -EINVAL;
 845         }
 846
 847         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 848         if (!pr_reg) {
 849                 pr_err("Unable to allocate struct t10_pr_registration\n");
 850                 return -ENOMEM;
 851         }
 852
 853         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 854         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 855         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 856         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 857         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 858         atomic_set(&pr_reg->pr_res_holders, 0);
 859         pr_reg->pr_reg_nacl = NULL;
 860         pr_reg->pr_reg_deve = NULL;
 861         pr_reg->pr_res_mapped_lun = mapped_lun;
 862         pr_reg->pr_aptpl_target_lun = target_lun;
 863         pr_reg->pr_res_key = sa_res_key;
 864         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 865         pr_reg->pr_reg_aptpl = 1;
 866         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 867         pr_reg->pr_res_type = type;
 868         /*
 869          * If an ISID value had been saved in APTPL metadata for this
 870          * SCSI Initiator Port, restore it now.
 871          */
 872         if (isid != NULL) {
 873                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 874                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 875                 pr_reg->isid_present_at_reg = 1;
 876         }
 877         /*
 878          * Copy the i_port and t_port information from caller.
 879          */
 880         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 881         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 882         pr_reg->pr_reg_tpgt = tpgt;
 883         /*
 884          * Set pr_res_holder from caller, the pr_reg who is the reservation
 885          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 886          * the Initiator Node LUN ACL from the fabric module is created for
 887          * this registration.
 888          */
 889         pr_reg->pr_res_holder = res_holder;
 890
 891         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 892         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 893                         " metadata\n", (res_holder) ? "+reservation" : "");
 894         return 0;
 895 }
 896
 897 static void core_scsi3_aptpl_reserve(
 898         struct se_device *dev,
 899         struct se_portal_group *tpg,
 900         struct se_node_acl *node_acl,
 901         struct t10_pr_registration *pr_reg)
 902 {
 903         char i_buf[PR_REG_ISID_ID_LEN];
 904
 905         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 906         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 907
 908         spin_lock(&dev->dev_reservation_lock);
 909         dev->dev_pr_res_holder = pr_reg;
 910         spin_unlock(&dev->dev_reservation_lock);
 911
 912         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 913                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 914                 tpg->se_tpg_tfo->get_fabric_name(),
 915                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 916                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 917         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 918                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 919                 i_buf);
 920 }
 921
 922 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 923                                 struct t10_pr_registration *, enum register_type, int);
 924
 925 static int __core_scsi3_check_aptpl_registration(
 926         struct se_device *dev,
 927         struct se_portal_group *tpg,
 928         struct se_lun *lun,
 929         u64 target_lun,
 930         struct se_node_acl *nacl,
 931         u64 mapped_lun)
 932 {
 933         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 934         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 935         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 936         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 937         u16 tpgt;
 938
 939         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 940         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 941         /*
 942          * Copy Initiator Port information from struct se_node_acl
 943          */
 944         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 945         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 946                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 947         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 948         /*
 949          * Look for the matching registrations+reservation from those
 950          * created from APTPL metadata.  Note that multiple registrations
 951          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 952          * TransportIDs.
 953          */
 954         spin_lock(&pr_tmpl->aptpl_reg_lock);
 955         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 956                                 pr_reg_aptpl_list) {
 957
 958                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 959                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 960                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 961                      (pr_reg->pr_reg_tpgt == tpgt) &&
 962                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 963                         /*
 964                          * Obtain the ->pr_reg_deve pointer + reference, that
 965                          * is released by __core_scsi3_add_registration() below.
 966                          */
 967                         rcu_read_lock();
 968                         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 969                         if (!pr_reg->pr_reg_deve) {
 970                                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
 971                                         " %llu\n", nacl->initiatorname, mapped_lun);
 972                                 rcu_read_unlock();
 973                                 continue;
 974                         }
 975                         kref_get(&pr_reg->pr_reg_deve->pr_kref);
 976                         rcu_read_unlock();
 977
 978                         pr_reg->pr_reg_nacl = nacl;
 979                         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 980                         list_del(&pr_reg->pr_reg_aptpl_list);
 981                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 982                         /*
 983                          * At this point all of the pointers in *pr_reg will
 984                          * be setup, so go ahead and add the registration.
 985                          */
 986                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 987                         /*
 988                          * If this registration is the reservation holder,
 989                          * make that happen now..
 990                          */
 991                         if (pr_reg->pr_res_holder)
 992                                 core_scsi3_aptpl_reserve(dev, tpg,
 993                                                 nacl, pr_reg);
 994                         /*
 995                          * Reenable pr_aptpl_active to accept new metadata
 996                          * updates once the SCSI device is active again..
 997                          */
 998                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 999                         pr_tmpl->pr_aptpl_active = 1;
1000                 }
1001         }
1002         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1003
1004         return 0;
1005 }
1006
1007 int core_scsi3_check_aptpl_registration(
1008         struct se_device *dev,
1009         struct se_portal_group *tpg,
1010         struct se_lun *lun,
1011         struct se_node_acl *nacl,
1012         u64 mapped_lun)
1013 {
1014         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1015                 return 0;
1016
1017         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1018                                                      lun->unpacked_lun, nacl,
1019                                                      mapped_lun);
1020 }
1021
1022 static void __core_scsi3_dump_registration(
1023         const struct target_core_fabric_ops *tfo,
1024         struct se_device *dev,
1025         struct se_node_acl *nacl,
1026         struct t10_pr_registration *pr_reg,
1027         enum register_type register_type)
1028 {
1029         struct se_portal_group *se_tpg = nacl->se_tpg;
1030         char i_buf[PR_REG_ISID_ID_LEN];
1031
1032         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1033         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1034
1035         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1036                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1037                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1038                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1039                 i_buf);
1040         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1041                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1042                 tfo->tpg_get_tag(se_tpg));
1043         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1044                 " Port(s)\n",  tfo->get_fabric_name(),
1045                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1046                 dev->transport->name);
1047         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1048                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1049                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1050                 pr_reg->pr_reg_aptpl);
1051 }
1052
1053 static void __core_scsi3_add_registration(
1054         struct se_device *dev,
1055         struct se_node_acl *nacl,
1056         struct t10_pr_registration *pr_reg,
1057         enum register_type register_type,
1058         int register_move)
1059 {
1060         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1061         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1062         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1063         struct se_dev_entry *deve;
1064
1065         /*
1066          * Increment PRgeneration counter for struct se_device upon a successful
1067          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1068          *
1069          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1070          * action, the struct se_device->dev_reservation_lock will already be held,
1071          * so we do not call core_scsi3_pr_generation() which grabs the lock
1072          * for the REGISTER.
1073          */
1074         pr_reg->pr_res_generation = (register_move) ?
1075                         dev->t10_pr.pr_generation++ :
1076                         core_scsi3_pr_generation(dev);
1077
1078         spin_lock(&pr_tmpl->registration_lock);
1079         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1080
1081         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1082         spin_unlock(&pr_tmpl->registration_lock);
1083         /*
1084          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1085          */
1086         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1087                 goto out;
1088         /*
1089          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1090          * allocated in __core_scsi3_alloc_registration()
1091          */
1092         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1093                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1094                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1095
1096                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1097
1098                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1099
1100                 spin_lock(&pr_tmpl->registration_lock);
1101                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1102                               &pr_tmpl->registration_list);
1103
1104                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1105                                                register_type);
1106                 spin_unlock(&pr_tmpl->registration_lock);
1107                 /*
1108                  * Drop configfs group dependency reference and deve->pr_kref
1109                  * obtained from  __core_scsi3_alloc_registration() code.
1110                  */
1111                 rcu_read_lock();
1112                 deve = pr_reg_tmp->pr_reg_deve;
1113                 if (deve) {
1114                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1115                         core_scsi3_lunacl_undepend_item(deve);
1116                         pr_reg_tmp->pr_reg_deve = NULL;
1117                 }
1118                 rcu_read_unlock();
1119         }
1120 out:
1121         /*
1122          * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1123          */
1124         rcu_read_lock();
1125         deve = pr_reg->pr_reg_deve;
1126         if (deve) {
1127                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1128                 kref_put(&deve->pr_kref, target_pr_kref_release);
1129                 pr_reg->pr_reg_deve = NULL;
1130         }
1131         rcu_read_unlock();
1132 }
1133
1134 static int core_scsi3_alloc_registration(
1135         struct se_device *dev,
1136         struct se_node_acl *nacl,
1137         struct se_lun *lun,
1138         struct se_dev_entry *deve,
1139         u64 mapped_lun,
1140         unsigned char *isid,
1141         u64 sa_res_key,
1142         int all_tg_pt,
1143         int aptpl,
1144         enum register_type register_type,
1145         int register_move)
1146 {
1147         struct t10_pr_registration *pr_reg;
1148
1149         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1150                                                  isid, sa_res_key, all_tg_pt,
1151                                                  aptpl);
1152         if (!pr_reg)
1153                 return -EPERM;
1154
1155         __core_scsi3_add_registration(dev, nacl, pr_reg,
1156                         register_type, register_move);
1157         return 0;
1158 }
1159
1160 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1161         struct se_device *dev,
1162         struct se_node_acl *nacl,
1163         unsigned char *isid)
1164 {
1165         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1166         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1167         struct se_portal_group *tpg;
1168
1169         spin_lock(&pr_tmpl->registration_lock);
1170         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1171                         &pr_tmpl->registration_list, pr_reg_list) {
1172                 /*
1173                  * First look for a matching struct se_node_acl
1174                  */
1175                 if (pr_reg->pr_reg_nacl != nacl)
1176                         continue;
1177
1178                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1179                 /*
1180                  * If this registration does NOT contain a fabric provided
1181                  * ISID, then we have found a match.
1182                  */
1183                 if (!pr_reg->isid_present_at_reg) {
1184                         /*
1185                          * Determine if this SCSI device server requires that
1186                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1187                          * for fabric modules (iSCSI) requiring them.
1188                          */
1189                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1190                                 if (dev->dev_attrib.enforce_pr_isids)
1191                                         continue;
1192                         }
1193                         atomic_inc_mb(&pr_reg->pr_res_holders);
1194                         spin_unlock(&pr_tmpl->registration_lock);
1195                         return pr_reg;
1196                 }
1197                 /*
1198                  * If the *pr_reg contains a fabric defined ISID for multi-value
1199                  * SCSI Initiator Port TransportIDs, then we expect a valid
1200                  * matching ISID to be provided by the local SCSI Initiator Port.
1201                  */
1202                 if (!isid)
1203                         continue;
1204                 if (strcmp(isid, pr_reg->pr_reg_isid))
1205                         continue;
1206
1207                 atomic_inc_mb(&pr_reg->pr_res_holders);
1208                 spin_unlock(&pr_tmpl->registration_lock);
1209                 return pr_reg;
1210         }
1211         spin_unlock(&pr_tmpl->registration_lock);
1212
1213         return NULL;
1214 }
1215
1216 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1217         struct se_device *dev,
1218         struct se_node_acl *nacl,
1219         struct se_session *sess)
1220 {
1221         struct se_portal_group *tpg = nacl->se_tpg;
1222         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1223
1224         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1225                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1226                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1227                                         PR_REG_ISID_LEN);
1228                 isid_ptr = &buf[0];
1229         }
1230
1231         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1232 }
1233
1234 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1235 {
1236         atomic_dec_mb(&pr_reg->pr_res_holders);
1237 }
1238
1239 static int core_scsi3_check_implicit_release(
1240         struct se_device *dev,
1241         struct t10_pr_registration *pr_reg)
1242 {
1243         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1244         struct t10_pr_registration *pr_res_holder;
1245         int ret = 0;
1246
1247         spin_lock(&dev->dev_reservation_lock);
1248         pr_res_holder = dev->dev_pr_res_holder;
1249         if (!pr_res_holder) {
1250                 spin_unlock(&dev->dev_reservation_lock);
1251                 return ret;
1252         }
1253         if (pr_res_holder == pr_reg) {
1254                 /*
1255                  * Perform an implicit RELEASE if the registration that
1256                  * is being released is holding the reservation.
1257                  *
1258                  * From spc4r17, section 5.7.11.1:
1259                  *
1260                  * e) If the I_T nexus is the persistent reservation holder
1261                  *    and the persistent reservation is not an all registrants
1262                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1263                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1264                  *    service action with the SERVICE ACTION RESERVATION KEY
1265                  *    field set to zero (see 5.7.11.3).
1266                  */
1267                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1268                 ret = 1;
1269                 /*
1270                  * For 'All Registrants' reservation types, all existing
1271                  * registrations are still processed as reservation holders
1272                  * in core_scsi3_pr_seq_non_holder() after the initial
1273                  * reservation holder is implicitly released here.
1274                  */
1275         } else if (pr_reg->pr_reg_all_tg_pt &&
1276                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1277                           pr_reg->pr_reg_nacl->initiatorname)) &&
1278                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1279                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1280                         " UNREGISTER while existing reservation with matching"
1281                         " key 0x%016Lx is present from another SCSI Initiator"
1282                         " Port\n", pr_reg->pr_res_key);
1283                 ret = -EPERM;
1284         }
1285         spin_unlock(&dev->dev_reservation_lock);
1286
1287         return ret;
1288 }
1289
1290 /*
1291  * Called with struct t10_reservation->registration_lock held.
1292  */
1293 static void __core_scsi3_free_registration(
1294         struct se_device *dev,
1295         struct t10_pr_registration *pr_reg,
1296         struct list_head *preempt_and_abort_list,
1297         int dec_holders)
1298         __releases(&pr_tmpl->registration_lock)
1299         __acquires(&pr_tmpl->registration_lock)
1300 {
1301         const struct target_core_fabric_ops *tfo =
1302                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1303         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1304         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1305         struct se_dev_entry *deve;
1306         char i_buf[PR_REG_ISID_ID_LEN];
1307
1308         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1309         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1310
1311         if (!list_empty(&pr_reg->pr_reg_list))
1312                 list_del(&pr_reg->pr_reg_list);
1313         /*
1314          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1315          * so call core_scsi3_put_pr_reg() to decrement our reference.
1316          */
1317         if (dec_holders)
1318                 core_scsi3_put_pr_reg(pr_reg);
1319
1320         spin_unlock(&pr_tmpl->registration_lock);
1321         /*
1322          * Wait until all reference from any other I_T nexuses for this
1323          * *pr_reg have been released.  Because list_del() is called above,
1324          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1325          * count back to zero, and we release *pr_reg.
1326          */
1327         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1328                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1329                                 tfo->get_fabric_name());
1330                 cpu_relax();
1331         }
1332
1333         rcu_read_lock();
1334         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1335         if (deve)
1336                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1337         rcu_read_unlock();
1338
1339         spin_lock(&pr_tmpl->registration_lock);
1340         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1341                 " Node: %s%s\n", tfo->get_fabric_name(),
1342                 pr_reg->pr_reg_nacl->initiatorname,
1343                 i_buf);
1344         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1345                 " Port(s)\n", tfo->get_fabric_name(),
1346                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1347                 dev->transport->name);
1348         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1349                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1350                 pr_reg->pr_res_generation);
1351
1352         if (!preempt_and_abort_list) {
1353                 pr_reg->pr_reg_deve = NULL;
1354                 pr_reg->pr_reg_nacl = NULL;
1355                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1356                 return;
1357         }
1358         /*
1359          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1360          * are released once the ABORT_TASK_SET has completed..
1361          */
1362         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1363 }
1364
1365 void core_scsi3_free_pr_reg_from_nacl(
1366         struct se_device *dev,
1367         struct se_node_acl *nacl)
1368 {
1369         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1370         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1371         bool free_reg = false;
1372         /*
1373          * If the passed se_node_acl matches the reservation holder,
1374          * release the reservation.
1375          */
1376         spin_lock(&dev->dev_reservation_lock);
1377         pr_res_holder = dev->dev_pr_res_holder;
1378         if ((pr_res_holder != NULL) &&
1379             (pr_res_holder->pr_reg_nacl == nacl)) {
1380                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1381                 free_reg = true;
1382         }
1383         spin_unlock(&dev->dev_reservation_lock);
1384         /*
1385          * Release any registration associated with the struct se_node_acl.
1386          */
1387         spin_lock(&pr_tmpl->registration_lock);
1388         if (pr_res_holder && free_reg)
1389                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1390
1391         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1392                         &pr_tmpl->registration_list, pr_reg_list) {
1393
1394                 if (pr_reg->pr_reg_nacl != nacl)
1395                         continue;
1396
1397                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1398         }
1399         spin_unlock(&pr_tmpl->registration_lock);
1400 }
1401
1402 void core_scsi3_free_all_registrations(
1403         struct se_device *dev)
1404 {
1405         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1406         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1407
1408         spin_lock(&dev->dev_reservation_lock);
1409         pr_res_holder = dev->dev_pr_res_holder;
1410         if (pr_res_holder != NULL) {
1411                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1412                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1413                                                   pr_res_holder, 0, 0);
1414         }
1415         spin_unlock(&dev->dev_reservation_lock);
1416
1417         spin_lock(&pr_tmpl->registration_lock);
1418         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1419                         &pr_tmpl->registration_list, pr_reg_list) {
1420
1421                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1422         }
1423         spin_unlock(&pr_tmpl->registration_lock);
1424
1425         spin_lock(&pr_tmpl->aptpl_reg_lock);
1426         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1427                                 pr_reg_aptpl_list) {
1428                 list_del(&pr_reg->pr_reg_aptpl_list);
1429                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1430         }
1431         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1432 }
1433
1434 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1435 {
1436         return target_depend_item(&tpg->tpg_group.cg_item);
1437 }
1438
1439 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1440 {
1441         target_undepend_item(&tpg->tpg_group.cg_item);
1442         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1443 }
1444
1445 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1446 {
1447         if (nacl->dynamic_node_acl)
1448                 return 0;
1449         return target_depend_item(&nacl->acl_group.cg_item);
1450 }
1451
1452 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1453 {
1454         if (!nacl->dynamic_node_acl)
1455                 target_undepend_item(&nacl->acl_group.cg_item);
1456         atomic_dec_mb(&nacl->acl_pr_ref_count);
1457 }
1458
1459 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1460 {
1461         struct se_lun_acl *lun_acl;
1462         struct se_node_acl *nacl;
1463         struct se_portal_group *tpg;
1464         /*
1465          * For nacl->dynamic_node_acl=1
1466          */
1467         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1468                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1469         if (!lun_acl)
1470                 return 0;
1471
1472         nacl = lun_acl->se_lun_nacl;
1473         tpg = nacl->se_tpg;
1474
1475         return target_depend_item(&lun_acl->se_lun_group.cg_item);
1476 }
1477
1478 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1479 {
1480         struct se_lun_acl *lun_acl;
1481         struct se_node_acl *nacl;
1482         struct se_portal_group *tpg;
1483         /*
1484          * For nacl->dynamic_node_acl=1
1485          */
1486         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1487                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1488         if (!lun_acl) {
1489                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1490                 return;
1491         }
1492         nacl = lun_acl->se_lun_nacl;
1493         tpg = nacl->se_tpg;
1494
1495         target_undepend_item(&lun_acl->se_lun_group.cg_item);
1496         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1497 }
1498
1499 static sense_reason_t
1500 core_scsi3_decode_spec_i_port(
1501         struct se_cmd *cmd,
1502         struct se_portal_group *tpg,
1503         unsigned char *l_isid,
1504         u64 sa_res_key,
1505         int all_tg_pt,
1506         int aptpl)
1507 {
1508         struct se_device *dev = cmd->se_dev;
1509         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1510         struct se_session *se_sess = cmd->se_sess;
1511         struct se_node_acl *dest_node_acl = NULL;
1512         struct se_dev_entry *dest_se_deve = NULL;
1513         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1514         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1515         LIST_HEAD(tid_dest_list);
1516         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1517         unsigned char *buf, *ptr, proto_ident;
1518         const unsigned char *i_str = NULL;
1519         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1520         sense_reason_t ret;
1521         u32 tpdl, tid_len = 0;
1522         u32 dest_rtpi = 0;
1523
1524         /*
1525          * Allocate a struct pr_transport_id_holder and setup the
1526          * local_node_acl pointer and add to struct list_head tid_dest_list
1527          * for add registration processing in the loop of tid_dest_list below.
1528          */
1529         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1530         if (!tidh_new) {
1531                 pr_err("Unable to allocate tidh_new\n");
1532                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1533         }
1534         INIT_LIST_HEAD(&tidh_new->dest_list);
1535         tidh_new->dest_tpg = tpg;
1536         tidh_new->dest_node_acl = se_sess->se_node_acl;
1537
1538         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1539                                 se_sess->se_node_acl, cmd->se_lun,
1540                                 NULL, cmd->orig_fe_lun, l_isid,
1541                                 sa_res_key, all_tg_pt, aptpl);
1542         if (!local_pr_reg) {
1543                 kfree(tidh_new);
1544                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1545         }
1546         tidh_new->dest_pr_reg = local_pr_reg;
1547         /*
1548          * The local I_T nexus does not hold any configfs dependances,
1549          * so we set tidh_new->dest_se_deve to NULL to prevent the
1550          * configfs_undepend_item() calls in the tid_dest_list loops below.
1551          */
1552         tidh_new->dest_se_deve = NULL;
1553         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1554
1555         if (cmd->data_length < 28) {
1556                 pr_warn("SPC-PR: Received PR OUT parameter list"
1557                         " length too small: %u\n", cmd->data_length);
1558                 ret = TCM_INVALID_PARAMETER_LIST;
1559                 goto out;
1560         }
1561
1562         buf = transport_kmap_data_sg(cmd);
1563         if (!buf) {
1564                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1565                 goto out;
1566         }
1567
1568         /*
1569          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1570          * first extract TransportID Parameter Data Length, and make sure
1571          * the value matches up to the SCSI expected data transfer length.
1572          */
1573         tpdl = (buf[24] & 0xff) << 24;
1574         tpdl |= (buf[25] & 0xff) << 16;
1575         tpdl |= (buf[26] & 0xff) << 8;
1576         tpdl |= buf[27] & 0xff;
1577
1578         if ((tpdl + 28) != cmd->data_length) {
1579                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1580                         " does not equal CDB data_length: %u\n", tpdl,
1581                         cmd->data_length);
1582                 ret = TCM_INVALID_PARAMETER_LIST;
1583                 goto out_unmap;
1584         }
1585         /*
1586          * Start processing the received transport IDs using the
1587          * receiving I_T Nexus portal's fabric dependent methods to
1588          * obtain the SCSI Initiator Port/Device Identifiers.
1589          */
1590         ptr = &buf[28];
1591
1592         while (tpdl > 0) {
1593                 struct se_lun *dest_lun, *tmp_lun;
1594
1595                 proto_ident = (ptr[0] & 0x0f);
1596                 dest_tpg = NULL;
1597
1598                 spin_lock(&dev->se_port_lock);
1599                 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1600                         tmp_tpg = tmp_lun->lun_tpg;
1601
1602                         /*
1603                          * Look for the matching proto_ident provided by
1604                          * the received TransportID
1605                          */
1606                         if (tmp_tpg->proto_id != proto_ident)
1607                                 continue;
1608                         dest_rtpi = tmp_lun->lun_rtpi;
1609
1610                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1611                                         (const char *)ptr, &tid_len, &iport_ptr);
1612                         if (!i_str)
1613                                 continue;
1614
1615                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1616                         spin_unlock(&dev->se_port_lock);
1617
1618                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1619                                 pr_err(" core_scsi3_tpg_depend_item()"
1620                                         " for tmp_tpg\n");
1621                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1622                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1623                                 goto out_unmap;
1624                         }
1625                         /*
1626                          * Locate the destination initiator ACL to be registered
1627                          * from the decoded fabric module specific TransportID
1628                          * at *i_str.
1629                          */
1630                         mutex_lock(&tmp_tpg->acl_node_mutex);
1631                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1632                                                 tmp_tpg, i_str);
1633                         if (dest_node_acl)
1634                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1635                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1636
1637                         if (!dest_node_acl) {
1638                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1639                                 spin_lock(&dev->se_port_lock);
1640                                 continue;
1641                         }
1642
1643                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1644                                 pr_err("configfs_depend_item() failed"
1645                                         " for dest_node_acl->acl_group\n");
1646                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1647                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1648                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1649                                 goto out_unmap;
1650                         }
1651
1652                         dest_tpg = tmp_tpg;
1653                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1654                                 " %s Port RTPI: %hu\n",
1655                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1656                                 dest_node_acl->initiatorname, dest_rtpi);
1657
1658                         spin_lock(&dev->se_port_lock);
1659                         break;
1660                 }
1661                 spin_unlock(&dev->se_port_lock);
1662
1663                 if (!dest_tpg) {
1664                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1665                                         " dest_tpg\n");
1666                         ret = TCM_INVALID_PARAMETER_LIST;
1667                         goto out_unmap;
1668                 }
1669
1670                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1671                         " tid_len: %d for %s + %s\n",
1672                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1673                         tpdl, tid_len, i_str, iport_ptr);
1674
1675                 if (tid_len > tpdl) {
1676                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1677                                 " %u for Transport ID: %s\n", tid_len, ptr);
1678                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1679                         core_scsi3_tpg_undepend_item(dest_tpg);
1680                         ret = TCM_INVALID_PARAMETER_LIST;
1681                         goto out_unmap;
1682                 }
1683                 /*
1684                  * Locate the desintation struct se_dev_entry pointer for matching
1685                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1686                  * Target Port.
1687                  */
1688                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1689                                         dest_rtpi);
1690                 if (!dest_se_deve) {
1691                         pr_err("Unable to locate %s dest_se_deve"
1692                                 " from destination RTPI: %hu\n",
1693                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1694                                 dest_rtpi);
1695
1696                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1697                         core_scsi3_tpg_undepend_item(dest_tpg);
1698                         ret = TCM_INVALID_PARAMETER_LIST;
1699                         goto out_unmap;
1700                 }
1701
1702                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1703                         pr_err("core_scsi3_lunacl_depend_item()"
1704                                         " failed\n");
1705                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1706                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1707                         core_scsi3_tpg_undepend_item(dest_tpg);
1708                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1709                         goto out_unmap;
1710                 }
1711
1712                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1713                         " dest_se_deve mapped_lun: %llu\n",
1714                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1715                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1716
1717                 /*
1718                  * Skip any TransportIDs that already have a registration for
1719                  * this target port.
1720                  */
1721                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1722                                         iport_ptr);
1723                 if (pr_reg_e) {
1724                         core_scsi3_put_pr_reg(pr_reg_e);
1725                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1726                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1727                         core_scsi3_tpg_undepend_item(dest_tpg);
1728                         ptr += tid_len;
1729                         tpdl -= tid_len;
1730                         tid_len = 0;
1731                         continue;
1732                 }
1733                 /*
1734                  * Allocate a struct pr_transport_id_holder and setup
1735                  * the dest_node_acl and dest_se_deve pointers for the
1736                  * loop below.
1737                  */
1738                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1739                                 GFP_KERNEL);
1740                 if (!tidh_new) {
1741                         pr_err("Unable to allocate tidh_new\n");
1742                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1743                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1744                         core_scsi3_tpg_undepend_item(dest_tpg);
1745                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1746                         goto out_unmap;
1747                 }
1748                 INIT_LIST_HEAD(&tidh_new->dest_list);
1749                 tidh_new->dest_tpg = dest_tpg;
1750                 tidh_new->dest_node_acl = dest_node_acl;
1751                 tidh_new->dest_se_deve = dest_se_deve;
1752
1753                 /*
1754                  * Allocate, but do NOT add the registration for the
1755                  * TransportID referenced SCSI Initiator port.  This
1756                  * done because of the following from spc4r17 in section
1757                  * 6.14.3 wrt SPEC_I_PT:
1758                  *
1759                  * "If a registration fails for any initiator port (e.g., if th
1760                  * logical unit does not have enough resources available to
1761                  * hold the registration information), no registrations shall be
1762                  * made, and the command shall be terminated with
1763                  * CHECK CONDITION status."
1764                  *
1765                  * That means we call __core_scsi3_alloc_registration() here,
1766                  * and then call __core_scsi3_add_registration() in the
1767                  * 2nd loop which will never fail.
1768                  */
1769                 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1770                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
1771
1772                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1773                                         dest_node_acl, dest_lun, dest_se_deve,
1774                                         dest_se_deve->mapped_lun, iport_ptr,
1775                                         sa_res_key, all_tg_pt, aptpl);
1776                 if (!dest_pr_reg) {
1777                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1778                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1779                         core_scsi3_tpg_undepend_item(dest_tpg);
1780                         kfree(tidh_new);
1781                         ret = TCM_INVALID_PARAMETER_LIST;
1782                         goto out_unmap;
1783                 }
1784                 tidh_new->dest_pr_reg = dest_pr_reg;
1785                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1786
1787                 ptr += tid_len;
1788                 tpdl -= tid_len;
1789                 tid_len = 0;
1790
1791         }
1792
1793         transport_kunmap_data_sg(cmd);
1794
1795         /*
1796          * Go ahead and create a registrations from tid_dest_list for the
1797          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1798          * and dest_se_deve.
1799          *
1800          * The SA Reservation Key from the PROUT is set for the
1801          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1802          * means that the TransportID Initiator port will be
1803          * registered on all of the target ports in the SCSI target device
1804          * ALL_TG_PT=0 means the registration will only be for the
1805          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1806          * was received.
1807          */
1808         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1809                 dest_tpg = tidh->dest_tpg;
1810                 dest_node_acl = tidh->dest_node_acl;
1811                 dest_se_deve = tidh->dest_se_deve;
1812                 dest_pr_reg = tidh->dest_pr_reg;
1813
1814                 list_del(&tidh->dest_list);
1815                 kfree(tidh);
1816
1817                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1818                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1819
1820                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1821                                         dest_pr_reg, 0, 0);
1822
1823                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1824                         " registered Transport ID for Node: %s%s Mapped LUN:"
1825                         " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1826                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1827                         dest_se_deve->mapped_lun : 0);
1828
1829                 if (!dest_se_deve) {
1830                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1831                                  target_pr_kref_release);
1832                         continue;
1833                 }
1834                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1835                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1836                 core_scsi3_tpg_undepend_item(dest_tpg);
1837         }
1838
1839         return 0;
1840 out_unmap:
1841         transport_kunmap_data_sg(cmd);
1842 out:
1843         /*
1844          * For the failure case, release everything from tid_dest_list
1845          * including *dest_pr_reg and the configfs dependances..
1846          */
1847         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1848                 dest_tpg = tidh->dest_tpg;
1849                 dest_node_acl = tidh->dest_node_acl;
1850                 dest_se_deve = tidh->dest_se_deve;
1851                 dest_pr_reg = tidh->dest_pr_reg;
1852
1853                 list_del(&tidh->dest_list);
1854                 kfree(tidh);
1855                 /*
1856                  * Release any extra ALL_TG_PT=1 registrations for
1857                  * the SPEC_I_PT=1 case.
1858                  */
1859                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1860                                 &dest_pr_reg->pr_reg_atp_list,
1861                                 pr_reg_atp_mem_list) {
1862                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1863                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1864                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1865                 }
1866
1867                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1868
1869                 if (!dest_se_deve) {
1870                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1871                                  target_pr_kref_release);
1872                         continue;
1873                 }
1874                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1875                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1876                 core_scsi3_tpg_undepend_item(dest_tpg);
1877         }
1878         return ret;
1879 }
1880
1881 static int core_scsi3_update_aptpl_buf(
1882         struct se_device *dev,
1883         unsigned char *buf,
1884         u32 pr_aptpl_buf_len)
1885 {
1886         struct se_portal_group *tpg;
1887         struct t10_pr_registration *pr_reg;
1888         unsigned char tmp[512], isid_buf[32];
1889         ssize_t len = 0;
1890         int reg_count = 0;
1891         int ret = 0;
1892
1893         spin_lock(&dev->dev_reservation_lock);
1894         spin_lock(&dev->t10_pr.registration_lock);
1895         /*
1896          * Walk the registration list..
1897          */
1898         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1899                         pr_reg_list) {
1900
1901                 tmp[0] = '\0';
1902                 isid_buf[0] = '\0';
1903                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1904                 /*
1905                  * Write out any ISID value to APTPL metadata that was included
1906                  * in the original registration.
1907                  */
1908                 if (pr_reg->isid_present_at_reg)
1909                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1910                                         pr_reg->pr_reg_isid);
1911                 /*
1912                  * Include special metadata if the pr_reg matches the
1913                  * reservation holder.
1914                  */
1915                 if (dev->dev_pr_res_holder == pr_reg) {
1916                         snprintf(tmp, 512, "PR_REG_START: %d"
1917                                 "\ninitiator_fabric=%s\n"
1918                                 "initiator_node=%s\n%s"
1919                                 "sa_res_key=%llu\n"
1920                                 "res_holder=1\nres_type=%02x\n"
1921                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1922                                 "mapped_lun=%llu\n", reg_count,
1923                                 tpg->se_tpg_tfo->get_fabric_name(),
1924                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1925                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1926                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1927                                 pr_reg->pr_res_mapped_lun);
1928                 } else {
1929                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1930                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1931                                 "sa_res_key=%llu\nres_holder=0\n"
1932                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1933                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1934                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1935                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1936                                 pr_reg->pr_res_mapped_lun);
1937                 }
1938
1939                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1940                         pr_err("Unable to update renaming APTPL metadata,"
1941                                " reallocating larger buffer\n");
1942                         ret = -EMSGSIZE;
1943                         goto out;
1944                 }
1945                 len += sprintf(buf+len, "%s", tmp);
1946
1947                 /*
1948                  * Include information about the associated SCSI target port.
1949                  */
1950                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1951                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1952                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1953                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1954                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1955                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1956                         reg_count);
1957
1958                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1959                         pr_err("Unable to update renaming APTPL metadata,"
1960                                " reallocating larger buffer\n");
1961                         ret = -EMSGSIZE;
1962                         goto out;
1963                 }
1964                 len += sprintf(buf+len, "%s", tmp);
1965                 reg_count++;
1966         }
1967
1968         if (!reg_count)
1969                 len += sprintf(buf+len, "No Registrations or Reservations");
1970
1971 out:
1972         spin_unlock(&dev->t10_pr.registration_lock);
1973         spin_unlock(&dev->dev_reservation_lock);
1974
1975         return ret;
1976 }
1977
1978 static int __core_scsi3_write_aptpl_to_file(
1979         struct se_device *dev,
1980         unsigned char *buf)
1981 {
1982         struct t10_wwn *wwn = &dev->t10_wwn;
1983         struct file *file;
1984         int flags = O_RDWR | O_CREAT | O_TRUNC;
1985         char path[512];
1986         u32 pr_aptpl_buf_len;
1987         int ret;
1988
1989         memset(path, 0, 512);
1990
1991         if (strlen(&wwn->unit_serial[0]) >= 512) {
1992                 pr_err("WWN value for struct se_device does not fit"
1993                         " into path buffer\n");
1994                 return -EMSGSIZE;
1995         }
1996
1997         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1998         file = filp_open(path, flags, 0600);
1999         if (IS_ERR(file)) {
2000                 pr_err("filp_open(%s) for APTPL metadata"
2001                         " failed\n", path);
2002                 return PTR_ERR(file);
2003         }
2004
2005         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
2006
2007         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
2008
2009         if (ret < 0)
2010                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2011         fput(file);
2012
2013         return (ret < 0) ? -EIO : 0;
2014 }
2015
2016 /*
2017  * Clear the APTPL metadata if APTPL has been disabled, otherwise
2018  * write out the updated metadata to struct file for this SCSI device.
2019  */
2020 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
2021 {
2022         unsigned char *buf;
2023         int rc, len = PR_APTPL_BUF_LEN;
2024
2025         if (!aptpl) {
2026                 char *null_buf = "No Registrations or Reservations\n";
2027
2028                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2029                 dev->t10_pr.pr_aptpl_active = 0;
2030                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2031
2032                 if (rc)
2033                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2034
2035                 return 0;
2036         }
2037 retry:
2038         buf = vzalloc(len);
2039         if (!buf)
2040                 return TCM_OUT_OF_RESOURCES;
2041
2042         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2043         if (rc < 0) {
2044                 vfree(buf);
2045                 len *= 2;
2046                 goto retry;
2047         }
2048
2049         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2050         if (rc != 0) {
2051                 pr_err("SPC-3 PR: Could not update APTPL\n");
2052                 vfree(buf);
2053                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2054         }
2055         dev->t10_pr.pr_aptpl_active = 1;
2056         vfree(buf);
2057         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2058         return 0;
2059 }
2060
2061 static sense_reason_t
2062 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2063                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2064 {
2065         struct se_session *se_sess = cmd->se_sess;
2066         struct se_device *dev = cmd->se_dev;
2067         struct se_lun *se_lun = cmd->se_lun;
2068         struct se_portal_group *se_tpg;
2069         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2070         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2071         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2072         sense_reason_t ret = TCM_NO_SENSE;
2073         int pr_holder = 0, type;
2074
2075         if (!se_sess || !se_lun) {
2076                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2077                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2078         }
2079         se_tpg = se_sess->se_tpg;
2080
2081         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2082                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2083                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2084                                 PR_REG_ISID_LEN);
2085                 isid_ptr = &isid_buf[0];
2086         }
2087         /*
2088          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2089          */
2090         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2091         if (!pr_reg) {
2092                 if (res_key) {
2093                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2094                                 " for SA REGISTER, returning CONFLICT\n");
2095                         return TCM_RESERVATION_CONFLICT;
2096                 }
2097                 /*
2098                  * Do nothing but return GOOD status.
2099                  */
2100                 if (!sa_res_key)
2101                         return 0;
2102
2103                 if (!spec_i_pt) {
2104                         /*
2105                          * Perform the Service Action REGISTER on the Initiator
2106                          * Port Endpoint that the PRO was received from on the
2107                          * Logical Unit of the SCSI device server.
2108                          */
2109                         if (core_scsi3_alloc_registration(cmd->se_dev,
2110                                         se_sess->se_node_acl, cmd->se_lun,
2111                                         NULL, cmd->orig_fe_lun, isid_ptr,
2112                                         sa_res_key, all_tg_pt, aptpl,
2113                                         register_type, 0)) {
2114                                 pr_err("Unable to allocate"
2115                                         " struct t10_pr_registration\n");
2116                                 return TCM_INVALID_PARAMETER_LIST;
2117                         }
2118                 } else {
2119                         /*
2120                          * Register both the Initiator port that received
2121                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2122                          * TransportID from Parameter list and loop through
2123                          * fabric dependent parameter list while calling
2124                          * logic from of core_scsi3_alloc_registration() for
2125                          * each TransportID provided SCSI Initiator Port/Device
2126                          */
2127                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2128                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2129                         if (ret != 0)
2130                                 return ret;
2131                 }
2132                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2133         }
2134
2135         /* ok, existing registration */
2136
2137         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2138                 pr_err("SPC-3 PR REGISTER: Received"
2139                        " res_key: 0x%016Lx does not match"
2140                        " existing SA REGISTER res_key:"
2141                        " 0x%016Lx\n", res_key,
2142                        pr_reg->pr_res_key);
2143                 ret = TCM_RESERVATION_CONFLICT;
2144                 goto out;
2145         }
2146
2147         if (spec_i_pt) {
2148                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2149                         " set on a registered nexus\n");
2150                 ret = TCM_INVALID_PARAMETER_LIST;
2151                 goto out;
2152         }
2153
2154         /*
2155          * An existing ALL_TG_PT=1 registration being released
2156          * must also set ALL_TG_PT=1 in the incoming PROUT.
2157          */
2158         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2159                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2160                         " registration exists, but ALL_TG_PT=1 bit not"
2161                         " present in received PROUT\n");
2162                 ret = TCM_INVALID_CDB_FIELD;
2163                 goto out;
2164         }
2165
2166         /*
2167          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2168          */
2169         if (sa_res_key) {
2170                 /*
2171                  * Increment PRgeneration counter for struct se_device"
2172                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2173                  * READ_KEYS service action.
2174                  */
2175                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2176                 pr_reg->pr_res_key = sa_res_key;
2177                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2178                          " Key for %s to: 0x%016Lx PRgeneration:"
2179                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2180                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2181                          pr_reg->pr_reg_nacl->initiatorname,
2182                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2183
2184         } else {
2185                 /*
2186                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2187                  */
2188                 type = pr_reg->pr_res_type;
2189                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2190                                                               pr_reg);
2191                 if (pr_holder < 0) {
2192                         ret = TCM_RESERVATION_CONFLICT;
2193                         goto out;
2194                 }
2195
2196                 spin_lock(&pr_tmpl->registration_lock);
2197                 /*
2198                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2199                  * and matching pr_res_key.
2200                  */
2201                 if (pr_reg->pr_reg_all_tg_pt) {
2202                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2203                                         &pr_tmpl->registration_list,
2204                                         pr_reg_list) {
2205
2206                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2207                                         continue;
2208                                 if (pr_reg_p->pr_res_key != res_key)
2209                                         continue;
2210                                 if (pr_reg == pr_reg_p)
2211                                         continue;
2212                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2213                                            pr_reg_p->pr_reg_nacl->initiatorname))
2214                                         continue;
2215
2216                                 __core_scsi3_free_registration(dev,
2217                                                 pr_reg_p, NULL, 0);
2218                         }
2219                 }
2220
2221                 /*
2222                  * Release the calling I_T Nexus registration now..
2223                  */
2224                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2225                 pr_reg = NULL;
2226
2227                 /*
2228                  * From spc4r17, section 5.7.11.3 Unregistering
2229                  *
2230                  * If the persistent reservation is a registrants only
2231                  * type, the device server shall establish a unit
2232                  * attention condition for the initiator port associated
2233                  * with every registered I_T nexus except for the I_T
2234                  * nexus on which the PERSISTENT RESERVE OUT command was
2235                  * received, with the additional sense code set to
2236                  * RESERVATIONS RELEASED.
2237                  */
2238                 if (pr_holder &&
2239                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2240                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2241                         list_for_each_entry(pr_reg_p,
2242                                         &pr_tmpl->registration_list,
2243                                         pr_reg_list) {
2244
2245                                 target_ua_allocate_lun(
2246                                         pr_reg_p->pr_reg_nacl,
2247                                         pr_reg_p->pr_res_mapped_lun,
2248                                         0x2A,
2249                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2250                         }
2251                 }
2252
2253                 spin_unlock(&pr_tmpl->registration_lock);
2254         }
2255
2256         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2257
2258 out:
2259         if (pr_reg)
2260                 core_scsi3_put_pr_reg(pr_reg);
2261         return ret;
2262 }
2263
2264 unsigned char *core_scsi3_pr_dump_type(int type)
2265 {
2266         switch (type) {
2267         case PR_TYPE_WRITE_EXCLUSIVE:
2268                 return "Write Exclusive Access";
2269         case PR_TYPE_EXCLUSIVE_ACCESS:
2270                 return "Exclusive Access";
2271         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2272                 return "Write Exclusive Access, Registrants Only";
2273         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2274                 return "Exclusive Access, Registrants Only";
2275         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2276                 return "Write Exclusive Access, All Registrants";
2277         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2278                 return "Exclusive Access, All Registrants";
2279         default:
2280                 break;
2281         }
2282
2283         return "Unknown SPC-3 PR Type";
2284 }
2285
2286 static sense_reason_t
2287 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2288 {
2289         struct se_device *dev = cmd->se_dev;
2290         struct se_session *se_sess = cmd->se_sess;
2291         struct se_lun *se_lun = cmd->se_lun;
2292         struct t10_pr_registration *pr_reg, *pr_res_holder;
2293         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2294         char i_buf[PR_REG_ISID_ID_LEN];
2295         sense_reason_t ret;
2296
2297         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2298
2299         if (!se_sess || !se_lun) {
2300                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2301                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2302         }
2303         /*
2304          * Locate the existing *pr_reg via struct se_node_acl pointers
2305          */
2306         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2307                                 se_sess);
2308         if (!pr_reg) {
2309                 pr_err("SPC-3 PR: Unable to locate"
2310                         " PR_REGISTERED *pr_reg for RESERVE\n");
2311                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2312         }
2313         /*
2314          * From spc4r17 Section 5.7.9: Reserving:
2315          *
2316          * An application client creates a persistent reservation by issuing
2317          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2318          * a registered I_T nexus with the following parameters:
2319          *    a) RESERVATION KEY set to the value of the reservation key that is
2320          *       registered with the logical unit for the I_T nexus; and
2321          */
2322         if (res_key != pr_reg->pr_res_key) {
2323                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2324                         " does not match existing SA REGISTER res_key:"
2325                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2326                 ret = TCM_RESERVATION_CONFLICT;
2327                 goto out_put_pr_reg;
2328         }
2329         /*
2330          * From spc4r17 Section 5.7.9: Reserving:
2331          *
2332          * From above:
2333          *  b) TYPE field and SCOPE field set to the persistent reservation
2334          *     being created.
2335          *
2336          * Only one persistent reservation is allowed at a time per logical unit
2337          * and that persistent reservation has a scope of LU_SCOPE.
2338          */
2339         if (scope != PR_SCOPE_LU_SCOPE) {
2340                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2341                 ret = TCM_INVALID_PARAMETER_LIST;
2342                 goto out_put_pr_reg;
2343         }
2344         /*
2345          * See if we have an existing PR reservation holder pointer at
2346          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2347          * *pr_res_holder.
2348          */
2349         spin_lock(&dev->dev_reservation_lock);
2350         pr_res_holder = dev->dev_pr_res_holder;
2351         if (pr_res_holder) {
2352                 /*
2353                  * From spc4r17 Section 5.7.9: Reserving:
2354                  *
2355                  * If the device server receives a PERSISTENT RESERVE OUT
2356                  * command from an I_T nexus other than a persistent reservation
2357                  * holder (see 5.7.10) that attempts to create a persistent
2358                  * reservation when a persistent reservation already exists for
2359                  * the logical unit, then the command shall be completed with
2360                  * RESERVATION CONFLICT status.
2361                  */
2362                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2363                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2364                         pr_err("SPC-3 PR: Attempted RESERVE from"
2365                                 " [%s]: %s while reservation already held by"
2366                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2367                                 cmd->se_tfo->get_fabric_name(),
2368                                 se_sess->se_node_acl->initiatorname,
2369                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2370                                 pr_res_holder->pr_reg_nacl->initiatorname);
2371
2372                         spin_unlock(&dev->dev_reservation_lock);
2373                         ret = TCM_RESERVATION_CONFLICT;
2374                         goto out_put_pr_reg;
2375                 }
2376                 /*
2377                  * From spc4r17 Section 5.7.9: Reserving:
2378                  *
2379                  * If a persistent reservation holder attempts to modify the
2380                  * type or scope of an existing persistent reservation, the
2381                  * command shall be completed with RESERVATION CONFLICT status.
2382                  */
2383                 if ((pr_res_holder->pr_res_type != type) ||
2384                     (pr_res_holder->pr_res_scope != scope)) {
2385                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2386                         pr_err("SPC-3 PR: Attempted RESERVE from"
2387                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2388                                 " while reservation already held by [%s]: %s,"
2389                                 " returning RESERVATION_CONFLICT\n",
2390                                 cmd->se_tfo->get_fabric_name(),
2391                                 se_sess->se_node_acl->initiatorname,
2392                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2393                                 pr_res_holder->pr_reg_nacl->initiatorname);
2394
2395                         spin_unlock(&dev->dev_reservation_lock);
2396                         ret = TCM_RESERVATION_CONFLICT;
2397                         goto out_put_pr_reg;
2398                 }
2399                 /*
2400                  * From spc4r17 Section 5.7.9: Reserving:
2401                  *
2402                  * If the device server receives a PERSISTENT RESERVE OUT
2403                  * command with RESERVE service action where the TYPE field and
2404                  * the SCOPE field contain the same values as the existing type
2405                  * and scope from a persistent reservation holder, it shall not
2406                  * make any change to the existing persistent reservation and
2407                  * shall completethe command with GOOD status.
2408                  */
2409                 spin_unlock(&dev->dev_reservation_lock);
2410                 ret = 0;
2411                 goto out_put_pr_reg;
2412         }
2413         /*
2414          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2415          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2416          */
2417         pr_reg->pr_res_scope = scope;
2418         pr_reg->pr_res_type = type;
2419         pr_reg->pr_res_holder = 1;
2420         dev->dev_pr_res_holder = pr_reg;
2421         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2422
2423         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2424                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2425                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2426                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2427         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2428                         cmd->se_tfo->get_fabric_name(),
2429                         se_sess->se_node_acl->initiatorname,
2430                         i_buf);
2431         spin_unlock(&dev->dev_reservation_lock);
2432
2433         if (pr_tmpl->pr_aptpl_active)
2434                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2435
2436         ret = 0;
2437 out_put_pr_reg:
2438         core_scsi3_put_pr_reg(pr_reg);
2439         return ret;
2440 }
2441
2442 static sense_reason_t
2443 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2444                 u64 res_key)
2445 {
2446         switch (type) {
2447         case PR_TYPE_WRITE_EXCLUSIVE:
2448         case PR_TYPE_EXCLUSIVE_ACCESS:
2449         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2450         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2451         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2452         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2453                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2454         default:
2455                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2456                         " 0x%02x\n", type);
2457                 return TCM_INVALID_CDB_FIELD;
2458         }
2459 }
2460
2461 /*
2462  * Called with struct se_device->dev_reservation_lock held.
2463  */
2464 static void __core_scsi3_complete_pro_release(
2465         struct se_device *dev,
2466         struct se_node_acl *se_nacl,
2467         struct t10_pr_registration *pr_reg,
2468         int explicit,
2469         int unreg)
2470 {
2471         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2472         char i_buf[PR_REG_ISID_ID_LEN];
2473         int pr_res_type = 0, pr_res_scope = 0;
2474
2475         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2476         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2477         /*
2478          * Go ahead and release the current PR reservation holder.
2479          * If an All Registrants reservation is currently active and
2480          * a unregister operation is requested, replace the current
2481          * dev_pr_res_holder with another active registration.
2482          */
2483         if (dev->dev_pr_res_holder) {
2484                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2485                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2486                 dev->dev_pr_res_holder->pr_res_type = 0;
2487                 dev->dev_pr_res_holder->pr_res_scope = 0;
2488                 dev->dev_pr_res_holder->pr_res_holder = 0;
2489                 dev->dev_pr_res_holder = NULL;
2490         }
2491         if (!unreg)
2492                 goto out;
2493
2494         spin_lock(&dev->t10_pr.registration_lock);
2495         list_del_init(&pr_reg->pr_reg_list);
2496         /*
2497          * If the I_T nexus is a reservation holder, the persistent reservation
2498          * is of an all registrants type, and the I_T nexus is the last remaining
2499          * registered I_T nexus, then the device server shall also release the
2500          * persistent reservation.
2501          */
2502         if (!list_empty(&dev->t10_pr.registration_list) &&
2503             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2504              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2505                 dev->dev_pr_res_holder =
2506                         list_entry(dev->t10_pr.registration_list.next,
2507                                    struct t10_pr_registration, pr_reg_list);
2508                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2509                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2510                 dev->dev_pr_res_holder->pr_res_holder = 1;
2511         }
2512         spin_unlock(&dev->t10_pr.registration_lock);
2513 out:
2514         if (!dev->dev_pr_res_holder) {
2515                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2516                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2517                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2518                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2519                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2520         }
2521         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2522                 tfo->get_fabric_name(), se_nacl->initiatorname,
2523                 i_buf);
2524         /*
2525          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2526          */
2527         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2528 }
2529
2530 static sense_reason_t
2531 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2532                 u64 res_key)
2533 {
2534         struct se_device *dev = cmd->se_dev;
2535         struct se_session *se_sess = cmd->se_sess;
2536         struct se_lun *se_lun = cmd->se_lun;
2537         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2538         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2539         sense_reason_t ret = 0;
2540
2541         if (!se_sess || !se_lun) {
2542                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2543                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2544         }
2545         /*
2546          * Locate the existing *pr_reg via struct se_node_acl pointers
2547          */
2548         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2549         if (!pr_reg) {
2550                 pr_err("SPC-3 PR: Unable to locate"
2551                         " PR_REGISTERED *pr_reg for RELEASE\n");
2552                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2553         }
2554         /*
2555          * From spc4r17 Section 5.7.11.2 Releasing:
2556          *
2557          * If there is no persistent reservation or in response to a persistent
2558          * reservation release request from a registered I_T nexus that is not a
2559          * persistent reservation holder (see 5.7.10), the device server shall
2560          * do the following:
2561          *
2562          *     a) Not release the persistent reservation, if any;
2563          *     b) Not remove any registrations; and
2564          *     c) Complete the command with GOOD status.
2565          */
2566         spin_lock(&dev->dev_reservation_lock);
2567         pr_res_holder = dev->dev_pr_res_holder;
2568         if (!pr_res_holder) {
2569                 /*
2570                  * No persistent reservation, return GOOD status.
2571                  */
2572                 spin_unlock(&dev->dev_reservation_lock);
2573                 goto out_put_pr_reg;
2574         }
2575
2576         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2577                 /*
2578                  * Release request from a registered I_T nexus that is not a
2579                  * persistent reservation holder. return GOOD status.
2580                  */
2581                 spin_unlock(&dev->dev_reservation_lock);
2582                 goto out_put_pr_reg;
2583         }
2584
2585         /*
2586          * From spc4r17 Section 5.7.11.2 Releasing:
2587          *
2588          * Only the persistent reservation holder (see 5.7.10) is allowed to
2589          * release a persistent reservation.
2590          *
2591          * An application client releases the persistent reservation by issuing
2592          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2593          * an I_T nexus that is a persistent reservation holder with the
2594          * following parameters:
2595          *
2596          *     a) RESERVATION KEY field set to the value of the reservation key
2597          *        that is registered with the logical unit for the I_T nexus;
2598          */
2599         if (res_key != pr_reg->pr_res_key) {
2600                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2601                         " does not match existing SA REGISTER res_key:"
2602                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2603                 spin_unlock(&dev->dev_reservation_lock);
2604                 ret = TCM_RESERVATION_CONFLICT;
2605                 goto out_put_pr_reg;
2606         }
2607         /*
2608          * From spc4r17 Section 5.7.11.2 Releasing and above:
2609          *
2610          * b) TYPE field and SCOPE field set to match the persistent
2611          *    reservation being released.
2612          */
2613         if ((pr_res_holder->pr_res_type != type) ||
2614             (pr_res_holder->pr_res_scope != scope)) {
2615                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2616                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2617                         " reservation from [%s]: %s with different TYPE "
2618                         "and/or SCOPE  while reservation already held by"
2619                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2620                         cmd->se_tfo->get_fabric_name(),
2621                         se_sess->se_node_acl->initiatorname,
2622                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2623                         pr_res_holder->pr_reg_nacl->initiatorname);
2624
2625                 spin_unlock(&dev->dev_reservation_lock);
2626                 ret = TCM_RESERVATION_CONFLICT;
2627                 goto out_put_pr_reg;
2628         }
2629         /*
2630          * In response to a persistent reservation release request from the
2631          * persistent reservation holder the device server shall perform a
2632          * release by doing the following as an uninterrupted series of actions:
2633          * a) Release the persistent reservation;
2634          * b) Not remove any registration(s);
2635          * c) If the released persistent reservation is a registrants only type
2636          * or all registrants type persistent reservation,
2637          *    the device server shall establish a unit attention condition for
2638          *    the initiator port associated with every regis-
2639          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2640          *    RESERVE OUT command with RELEASE service action was received,
2641          *    with the additional sense code set to RESERVATIONS RELEASED; and
2642          * d) If the persistent reservation is of any other type, the device
2643          *    server shall not establish a unit attention condition.
2644          */
2645         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2646                                           pr_reg, 1, 0);
2647
2648         spin_unlock(&dev->dev_reservation_lock);
2649
2650         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2651             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2652             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2653             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2654                 /*
2655                  * If no UNIT ATTENTION conditions will be established for
2656                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2657                  * go ahead and check for APTPL=1 update+write below
2658                  */
2659                 goto write_aptpl;
2660         }
2661
2662         spin_lock(&pr_tmpl->registration_lock);
2663         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2664                         pr_reg_list) {
2665                 /*
2666                  * Do not establish a UNIT ATTENTION condition
2667                  * for the calling I_T Nexus
2668                  */
2669                 if (pr_reg_p == pr_reg)
2670                         continue;
2671
2672                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2673                                 pr_reg_p->pr_res_mapped_lun,
2674                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2675         }
2676         spin_unlock(&pr_tmpl->registration_lock);
2677
2678 write_aptpl:
2679         if (pr_tmpl->pr_aptpl_active)
2680                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2681
2682 out_put_pr_reg:
2683         core_scsi3_put_pr_reg(pr_reg);
2684         return ret;
2685 }
2686
2687 static sense_reason_t
2688 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2689 {
2690         struct se_device *dev = cmd->se_dev;
2691         struct se_node_acl *pr_reg_nacl;
2692         struct se_session *se_sess = cmd->se_sess;
2693         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2694         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2695         u64 pr_res_mapped_lun = 0;
2696         int calling_it_nexus = 0;
2697         /*
2698          * Locate the existing *pr_reg via struct se_node_acl pointers
2699          */
2700         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2701                         se_sess->se_node_acl, se_sess);
2702         if (!pr_reg_n) {
2703                 pr_err("SPC-3 PR: Unable to locate"
2704                         " PR_REGISTERED *pr_reg for CLEAR\n");
2705                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2706         }
2707         /*
2708          * From spc4r17 section 5.7.11.6, Clearing:
2709          *
2710          * Any application client may release the persistent reservation and
2711          * remove all registrations from a device server by issuing a
2712          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2713          * registered I_T nexus with the following parameter:
2714          *
2715          *      a) RESERVATION KEY field set to the value of the reservation key
2716          *         that is registered with the logical unit for the I_T nexus.
2717          */
2718         if (res_key != pr_reg_n->pr_res_key) {
2719                 pr_err("SPC-3 PR REGISTER: Received"
2720                         " res_key: 0x%016Lx does not match"
2721                         " existing SA REGISTER res_key:"
2722                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2723                 core_scsi3_put_pr_reg(pr_reg_n);
2724                 return TCM_RESERVATION_CONFLICT;
2725         }
2726         /*
2727          * a) Release the persistent reservation, if any;
2728          */
2729         spin_lock(&dev->dev_reservation_lock);
2730         pr_res_holder = dev->dev_pr_res_holder;
2731         if (pr_res_holder) {
2732                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2733                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2734                                                   pr_res_holder, 0, 0);
2735         }
2736         spin_unlock(&dev->dev_reservation_lock);
2737         /*
2738          * b) Remove all registration(s) (see spc4r17 5.7.7);
2739          */
2740         spin_lock(&pr_tmpl->registration_lock);
2741         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2742                         &pr_tmpl->registration_list, pr_reg_list) {
2743
2744                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2745                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2746                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2747                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2748                                         calling_it_nexus);
2749                 /*
2750                  * e) Establish a unit attention condition for the initiator
2751                  *    port associated with every registered I_T nexus other
2752                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2753                  *    command with CLEAR service action was received, with the
2754                  *    additional sense code set to RESERVATIONS PREEMPTED.
2755                  */
2756                 if (!calling_it_nexus)
2757                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2758                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2759         }
2760         spin_unlock(&pr_tmpl->registration_lock);
2761
2762         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2763                 cmd->se_tfo->get_fabric_name());
2764
2765         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2766
2767         core_scsi3_pr_generation(dev);
2768         return 0;
2769 }
2770
2771 /*
2772  * Called with struct se_device->dev_reservation_lock held.
2773  */
2774 static void __core_scsi3_complete_pro_preempt(
2775         struct se_device *dev,
2776         struct t10_pr_registration *pr_reg,
2777         struct list_head *preempt_and_abort_list,
2778         int type,
2779         int scope,
2780         enum preempt_type preempt_type)
2781 {
2782         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2783         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2784         char i_buf[PR_REG_ISID_ID_LEN];
2785
2786         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2787         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2788         /*
2789          * Do an implicit RELEASE of the existing reservation.
2790          */
2791         if (dev->dev_pr_res_holder)
2792                 __core_scsi3_complete_pro_release(dev, nacl,
2793                                                   dev->dev_pr_res_holder, 0, 0);
2794
2795         dev->dev_pr_res_holder = pr_reg;
2796         pr_reg->pr_res_holder = 1;
2797         pr_reg->pr_res_type = type;
2798         pr_reg->pr_res_scope = scope;
2799
2800         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2801                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2802                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2803                 core_scsi3_pr_dump_type(type),
2804                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2805         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2806                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2807                 nacl->initiatorname, i_buf);
2808         /*
2809          * For PREEMPT_AND_ABORT, add the preempting reservation's
2810          * struct t10_pr_registration to the list that will be compared
2811          * against received CDBs..
2812          */
2813         if (preempt_and_abort_list)
2814                 list_add_tail(&pr_reg->pr_reg_abort_list,
2815                                 preempt_and_abort_list);
2816 }
2817
2818 static void core_scsi3_release_preempt_and_abort(
2819         struct list_head *preempt_and_abort_list,
2820         struct t10_pr_registration *pr_reg_holder)
2821 {
2822         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2823
2824         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2825                                 pr_reg_abort_list) {
2826
2827                 list_del(&pr_reg->pr_reg_abort_list);
2828                 if (pr_reg_holder == pr_reg)
2829                         continue;
2830                 if (pr_reg->pr_res_holder) {
2831                         pr_warn("pr_reg->pr_res_holder still set\n");
2832                         continue;
2833                 }
2834
2835                 pr_reg->pr_reg_deve = NULL;
2836                 pr_reg->pr_reg_nacl = NULL;
2837                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2838         }
2839 }
2840
2841 static sense_reason_t
2842 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2843                 u64 sa_res_key, enum preempt_type preempt_type)
2844 {
2845         struct se_device *dev = cmd->se_dev;
2846         struct se_node_acl *pr_reg_nacl;
2847         struct se_session *se_sess = cmd->se_sess;
2848         LIST_HEAD(preempt_and_abort_list);
2849         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2850         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2851         u64 pr_res_mapped_lun = 0;
2852         int all_reg = 0, calling_it_nexus = 0;
2853         bool sa_res_key_unmatched = sa_res_key != 0;
2854         int prh_type = 0, prh_scope = 0;
2855
2856         if (!se_sess)
2857                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2858
2859         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2860                                 se_sess);
2861         if (!pr_reg_n) {
2862                 pr_err("SPC-3 PR: Unable to locate"
2863                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2864                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2865                 return TCM_RESERVATION_CONFLICT;
2866         }
2867         if (pr_reg_n->pr_res_key != res_key) {
2868                 core_scsi3_put_pr_reg(pr_reg_n);
2869                 return TCM_RESERVATION_CONFLICT;
2870         }
2871         if (scope != PR_SCOPE_LU_SCOPE) {
2872                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2873                 core_scsi3_put_pr_reg(pr_reg_n);
2874                 return TCM_INVALID_PARAMETER_LIST;
2875         }
2876
2877         spin_lock(&dev->dev_reservation_lock);
2878         pr_res_holder = dev->dev_pr_res_holder;
2879         if (pr_res_holder &&
2880            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2881             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2882                 all_reg = 1;
2883
2884         if (!all_reg && !sa_res_key) {
2885                 spin_unlock(&dev->dev_reservation_lock);
2886                 core_scsi3_put_pr_reg(pr_reg_n);
2887                 return TCM_INVALID_PARAMETER_LIST;
2888         }
2889         /*
2890          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2891          *
2892          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2893          * persistent reservation holder or there is no persistent reservation
2894          * holder (i.e., there is no persistent reservation), then the device
2895          * server shall perform a preempt by doing the following in an
2896          * uninterrupted series of actions. (See below..)
2897          */
2898         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2899                 /*
2900                  * No existing or SA Reservation Key matching reservations..
2901                  *
2902                  * PROUT SA PREEMPT with All Registrant type reservations are
2903                  * allowed to be processed without a matching SA Reservation Key
2904                  */
2905                 spin_lock(&pr_tmpl->registration_lock);
2906                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2907                                 &pr_tmpl->registration_list, pr_reg_list) {
2908                         /*
2909                          * Removing of registrations in non all registrants
2910                          * type reservations without a matching SA reservation
2911                          * key.
2912                          *
2913                          * a) Remove the registrations for all I_T nexuses
2914                          *    specified by the SERVICE ACTION RESERVATION KEY
2915                          *    field;
2916                          * b) Ignore the contents of the SCOPE and TYPE fields;
2917                          * c) Process tasks as defined in 5.7.1; and
2918                          * d) Establish a unit attention condition for the
2919                          *    initiator port associated with every I_T nexus
2920                          *    that lost its registration other than the I_T
2921                          *    nexus on which the PERSISTENT RESERVE OUT command
2922                          *    was received, with the additional sense code set
2923                          *    to REGISTRATIONS PREEMPTED.
2924                          */
2925                         if (!all_reg) {
2926                                 if (pr_reg->pr_res_key != sa_res_key)
2927                                         continue;
2928                                 sa_res_key_unmatched = false;
2929
2930                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2931                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2932                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2933                                 __core_scsi3_free_registration(dev, pr_reg,
2934                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2935                                                 NULL, calling_it_nexus);
2936                         } else {
2937                                 /*
2938                                  * Case for any existing all registrants type
2939                                  * reservation, follow logic in spc4r17 section
2940                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2941                                  *
2942                                  * For a ZERO SA Reservation key, release
2943                                  * all other registrations and do an implicit
2944                                  * release of active persistent reservation.
2945                                  *
2946                                  * For a non-ZERO SA Reservation key, only
2947                                  * release the matching reservation key from
2948                                  * registrations.
2949                                  */
2950                                 if ((sa_res_key) &&
2951                                      (pr_reg->pr_res_key != sa_res_key))
2952                                         continue;
2953                                 sa_res_key_unmatched = false;
2954
2955                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2956                                 if (calling_it_nexus)
2957                                         continue;
2958
2959                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2960                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2961                                 __core_scsi3_free_registration(dev, pr_reg,
2962                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2963                                                 NULL, 0);
2964                         }
2965                         if (!calling_it_nexus)
2966                                 target_ua_allocate_lun(pr_reg_nacl,
2967                                         pr_res_mapped_lun, 0x2A,
2968                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2969                 }
2970                 spin_unlock(&pr_tmpl->registration_lock);
2971                 /*
2972                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2973                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2974                  * RESERVATION KEY field to a value that does not match any
2975                  * registered reservation key, then the device server shall
2976                  * complete the command with RESERVATION CONFLICT status.
2977                  */
2978                 if (sa_res_key_unmatched) {
2979                         spin_unlock(&dev->dev_reservation_lock);
2980                         core_scsi3_put_pr_reg(pr_reg_n);
2981                         return TCM_RESERVATION_CONFLICT;
2982                 }
2983                 /*
2984                  * For an existing all registrants type reservation
2985                  * with a zero SA rservation key, preempt the existing
2986                  * reservation with the new PR type and scope.
2987                  */
2988                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2989                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2990                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2991                                 type, scope, preempt_type);
2992
2993                         if (preempt_type == PREEMPT_AND_ABORT)
2994                                 core_scsi3_release_preempt_and_abort(
2995                                         &preempt_and_abort_list, pr_reg_n);
2996                 }
2997                 spin_unlock(&dev->dev_reservation_lock);
2998
2999                 if (pr_tmpl->pr_aptpl_active)
3000                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3001
3002                 core_scsi3_put_pr_reg(pr_reg_n);
3003                 core_scsi3_pr_generation(cmd->se_dev);
3004                 return 0;
3005         }
3006         /*
3007          * The PREEMPTing SA reservation key matches that of the
3008          * existing persistent reservation, first, we check if
3009          * we are preempting our own reservation.
3010          * From spc4r17, section 5.7.11.4.3 Preempting
3011          * persistent reservations and registration handling
3012          *
3013          * If an all registrants persistent reservation is not
3014          * present, it is not an error for the persistent
3015          * reservation holder to preempt itself (i.e., a
3016          * PERSISTENT RESERVE OUT with a PREEMPT service action
3017          * or a PREEMPT AND ABORT service action with the
3018          * SERVICE ACTION RESERVATION KEY value equal to the
3019          * persistent reservation holder's reservation key that
3020          * is received from the persistent reservation holder).
3021          * In that case, the device server shall establish the
3022          * new persistent reservation and maintain the
3023          * registration.
3024          */
3025         prh_type = pr_res_holder->pr_res_type;
3026         prh_scope = pr_res_holder->pr_res_scope;
3027         /*
3028          * If the SERVICE ACTION RESERVATION KEY field identifies a
3029          * persistent reservation holder (see 5.7.10), the device
3030          * server shall perform a preempt by doing the following as
3031          * an uninterrupted series of actions:
3032          *
3033          * a) Release the persistent reservation for the holder
3034          *    identified by the SERVICE ACTION RESERVATION KEY field;
3035          */
3036         if (pr_reg_n != pr_res_holder)
3037                 __core_scsi3_complete_pro_release(dev,
3038                                                   pr_res_holder->pr_reg_nacl,
3039                                                   dev->dev_pr_res_holder, 0, 0);
3040         /*
3041          * b) Remove the registrations for all I_T nexuses identified
3042          *    by the SERVICE ACTION RESERVATION KEY field, except the
3043          *    I_T nexus that is being used for the PERSISTENT RESERVE
3044          *    OUT command. If an all registrants persistent reservation
3045          *    is present and the SERVICE ACTION RESERVATION KEY field
3046          *    is set to zero, then all registrations shall be removed
3047          *    except for that of the I_T nexus that is being used for
3048          *    the PERSISTENT RESERVE OUT command;
3049          */
3050         spin_lock(&pr_tmpl->registration_lock);
3051         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3052                         &pr_tmpl->registration_list, pr_reg_list) {
3053
3054                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3055                 if (calling_it_nexus)
3056                         continue;
3057
3058                 if (pr_reg->pr_res_key != sa_res_key)
3059                         continue;
3060
3061                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3062                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3063                 __core_scsi3_free_registration(dev, pr_reg,
3064                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3065                                 calling_it_nexus);
3066                 /*
3067                  * e) Establish a unit attention condition for the initiator
3068                  *    port associated with every I_T nexus that lost its
3069                  *    persistent reservation and/or registration, with the
3070                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3071                  */
3072                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3073                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3074         }
3075         spin_unlock(&pr_tmpl->registration_lock);
3076         /*
3077          * c) Establish a persistent reservation for the preempting
3078          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3079          */
3080         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3081                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3082                         type, scope, preempt_type);
3083         /*
3084          * d) Process tasks as defined in 5.7.1;
3085          * e) See above..
3086          * f) If the type or scope has changed, then for every I_T nexus
3087          *    whose reservation key was not removed, except for the I_T
3088          *    nexus on which the PERSISTENT RESERVE OUT command was
3089          *    received, the device server shall establish a unit
3090          *    attention condition for the initiator port associated with
3091          *    that I_T nexus, with the additional sense code set to
3092          *    RESERVATIONS RELEASED. If the type or scope have not
3093          *    changed, then no unit attention condition(s) shall be
3094          *    established for this reason.
3095          */
3096         if ((prh_type != type) || (prh_scope != scope)) {
3097                 spin_lock(&pr_tmpl->registration_lock);
3098                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3099                                 &pr_tmpl->registration_list, pr_reg_list) {
3100
3101                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3102                         if (calling_it_nexus)
3103                                 continue;
3104
3105                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3106                                         pr_reg->pr_res_mapped_lun, 0x2A,
3107                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3108                 }
3109                 spin_unlock(&pr_tmpl->registration_lock);
3110         }
3111         spin_unlock(&dev->dev_reservation_lock);
3112         /*
3113          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3114          * All received CDBs for the matching existing reservation and
3115          * registrations undergo ABORT_TASK logic.
3116          *
3117          * From there, core_scsi3_release_preempt_and_abort() will
3118          * release every registration in the list (which have already
3119          * been removed from the primary pr_reg list), except the
3120          * new persistent reservation holder, the calling Initiator Port.
3121          */
3122         if (preempt_type == PREEMPT_AND_ABORT) {
3123                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3124                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3125                                                 pr_reg_n);
3126         }
3127
3128         if (pr_tmpl->pr_aptpl_active)
3129                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3130
3131         core_scsi3_put_pr_reg(pr_reg_n);
3132         core_scsi3_pr_generation(cmd->se_dev);
3133         return 0;
3134 }
3135
3136 static sense_reason_t
3137 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3138                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3139 {
3140         switch (type) {
3141         case PR_TYPE_WRITE_EXCLUSIVE:
3142         case PR_TYPE_EXCLUSIVE_ACCESS:
3143         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3144         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3145         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3146         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3147                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3148                                               sa_res_key, preempt_type);
3149         default:
3150                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3151                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3152                 return TCM_INVALID_CDB_FIELD;
3153         }
3154 }
3155
3156
3157 static sense_reason_t
3158 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3159                 u64 sa_res_key, int aptpl, int unreg)
3160 {
3161         struct se_session *se_sess = cmd->se_sess;
3162         struct se_device *dev = cmd->se_dev;
3163         struct se_dev_entry *dest_se_deve = NULL;
3164         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3165         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3166         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3167         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3168         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3169         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3170         unsigned char *buf;
3171         const unsigned char *initiator_str;
3172         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3173         u32 tid_len, tmp_tid_len;
3174         int new_reg = 0, type, scope, matching_iname;
3175         sense_reason_t ret;
3176         unsigned short rtpi;
3177         unsigned char proto_ident;
3178
3179         if (!se_sess || !se_lun) {
3180                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3181                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3182         }
3183
3184         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3185         se_tpg = se_sess->se_tpg;
3186         tf_ops = se_tpg->se_tpg_tfo;
3187         /*
3188          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3189          *      Register behaviors for a REGISTER AND MOVE service action
3190          *
3191          * Locate the existing *pr_reg via struct se_node_acl pointers
3192          */
3193         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3194                                 se_sess);
3195         if (!pr_reg) {
3196                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3197                         " *pr_reg for REGISTER_AND_MOVE\n");
3198                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3199         }
3200         /*
3201          * The provided reservation key much match the existing reservation key
3202          * provided during this initiator's I_T nexus registration.
3203          */
3204         if (res_key != pr_reg->pr_res_key) {
3205                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3206                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3207                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3208                 ret = TCM_RESERVATION_CONFLICT;
3209                 goto out_put_pr_reg;
3210         }
3211         /*
3212          * The service active reservation key needs to be non zero
3213          */
3214         if (!sa_res_key) {
3215                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3216                         " sa_res_key\n");
3217                 ret = TCM_INVALID_PARAMETER_LIST;
3218                 goto out_put_pr_reg;
3219         }
3220
3221         /*
3222          * Determine the Relative Target Port Identifier where the reservation
3223          * will be moved to for the TransportID containing SCSI initiator WWN
3224          * information.
3225          */
3226         buf = transport_kmap_data_sg(cmd);
3227         if (!buf) {
3228                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3229                 goto out_put_pr_reg;
3230         }
3231
3232         rtpi = (buf[18] & 0xff) << 8;
3233         rtpi |= buf[19] & 0xff;
3234         tid_len = (buf[20] & 0xff) << 24;
3235         tid_len |= (buf[21] & 0xff) << 16;
3236         tid_len |= (buf[22] & 0xff) << 8;
3237         tid_len |= buf[23] & 0xff;
3238         transport_kunmap_data_sg(cmd);
3239         buf = NULL;
3240
3241         if ((tid_len + 24) != cmd->data_length) {
3242                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3243                         " does not equal CDB data_length: %u\n", tid_len,
3244                         cmd->data_length);
3245                 ret = TCM_INVALID_PARAMETER_LIST;
3246                 goto out_put_pr_reg;
3247         }
3248
3249         spin_lock(&dev->se_port_lock);
3250         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3251                 if (tmp_lun->lun_rtpi != rtpi)
3252                         continue;
3253                 dest_se_tpg = tmp_lun->lun_tpg;
3254                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3255                 if (!dest_tf_ops)
3256                         continue;
3257
3258                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3259                 spin_unlock(&dev->se_port_lock);
3260
3261                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3262                         pr_err("core_scsi3_tpg_depend_item() failed"
3263                                 " for dest_se_tpg\n");
3264                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3265                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3266                         goto out_put_pr_reg;
3267                 }
3268
3269                 spin_lock(&dev->se_port_lock);
3270                 break;
3271         }
3272         spin_unlock(&dev->se_port_lock);
3273
3274         if (!dest_se_tpg || !dest_tf_ops) {
3275                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3276                         " fabric ops from Relative Target Port Identifier:"
3277                         " %hu\n", rtpi);
3278                 ret = TCM_INVALID_PARAMETER_LIST;
3279                 goto out_put_pr_reg;
3280         }
3281
3282         buf = transport_kmap_data_sg(cmd);
3283         if (!buf) {
3284                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3285                 goto out_put_pr_reg;
3286         }
3287         proto_ident = (buf[24] & 0x0f);
3288
3289         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3290                         " 0x%02x\n", proto_ident);
3291
3292         if (proto_ident != dest_se_tpg->proto_id) {
3293                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3294                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3295                         " from fabric: %s\n", proto_ident,
3296                         dest_se_tpg->proto_id,
3297                         dest_tf_ops->get_fabric_name());
3298                 ret = TCM_INVALID_PARAMETER_LIST;
3299                 goto out;
3300         }
3301         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3302                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3303         if (!initiator_str) {
3304                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3305                         " initiator_str from Transport ID\n");
3306                 ret = TCM_INVALID_PARAMETER_LIST;
3307                 goto out;
3308         }
3309
3310         transport_kunmap_data_sg(cmd);
3311         buf = NULL;
3312
3313         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3314                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3315                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3316                 iport_ptr : "");
3317         /*
3318          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3319          * action specifies a TransportID that is the same as the initiator port
3320          * of the I_T nexus for the command received, then the command shall
3321          * be terminated with CHECK CONDITION status, with the sense key set to
3322          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3323          * IN PARAMETER LIST.
3324          */
3325         pr_reg_nacl = pr_reg->pr_reg_nacl;
3326         matching_iname = (!strcmp(initiator_str,
3327                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3328         if (!matching_iname)
3329                 goto after_iport_check;
3330
3331         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3332                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3333                         " matches: %s on received I_T Nexus\n", initiator_str,
3334                         pr_reg_nacl->initiatorname);
3335                 ret = TCM_INVALID_PARAMETER_LIST;
3336                 goto out;
3337         }
3338         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3339                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3340                         " matches: %s %s on received I_T Nexus\n",
3341                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3342                         pr_reg->pr_reg_isid);
3343                 ret = TCM_INVALID_PARAMETER_LIST;
3344                 goto out;
3345         }
3346 after_iport_check:
3347         /*
3348          * Locate the destination struct se_node_acl from the received Transport ID
3349          */
3350         mutex_lock(&dest_se_tpg->acl_node_mutex);
3351         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3352                                 initiator_str);
3353         if (dest_node_acl)
3354                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3355         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3356
3357         if (!dest_node_acl) {
3358                 pr_err("Unable to locate %s dest_node_acl for"
3359                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3360                         initiator_str);
3361                 ret = TCM_INVALID_PARAMETER_LIST;
3362                 goto out;
3363         }
3364
3365         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3366                 pr_err("core_scsi3_nodeacl_depend_item() for"
3367                         " dest_node_acl\n");
3368                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3369                 dest_node_acl = NULL;
3370                 ret = TCM_INVALID_PARAMETER_LIST;
3371                 goto out;
3372         }
3373
3374         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3375                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3376                 dest_node_acl->initiatorname);
3377
3378         /*
3379          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3380          * PORT IDENTIFIER.
3381          */
3382         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3383         if (!dest_se_deve) {
3384                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3385                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3386                 ret = TCM_INVALID_PARAMETER_LIST;
3387                 goto out;
3388         }
3389
3390         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3391                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3392                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3393                 dest_se_deve = NULL;
3394                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3395                 goto out;
3396         }
3397
3398         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3399                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3400                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3401                 dest_se_deve->mapped_lun);
3402
3403         /*
3404          * A persistent reservation needs to already existing in order to
3405          * successfully complete the REGISTER_AND_MOVE service action..
3406          */
3407         spin_lock(&dev->dev_reservation_lock);
3408         pr_res_holder = dev->dev_pr_res_holder;
3409         if (!pr_res_holder) {
3410                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3411                         " currently held\n");
3412                 spin_unlock(&dev->dev_reservation_lock);
3413                 ret = TCM_INVALID_CDB_FIELD;
3414                 goto out;
3415         }
3416         /*
3417          * The received on I_T Nexus must be the reservation holder.
3418          *
3419          * From spc4r17 section 5.7.8  Table 50 --
3420          *      Register behaviors for a REGISTER AND MOVE service action
3421          */
3422         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3423                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3424                         " Nexus is not reservation holder\n");
3425                 spin_unlock(&dev->dev_reservation_lock);
3426                 ret = TCM_RESERVATION_CONFLICT;
3427                 goto out;
3428         }
3429         /*
3430          * From spc4r17 section 5.7.8: registering and moving reservation
3431          *
3432          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3433          * action is received and the established persistent reservation is a
3434          * Write Exclusive - All Registrants type or Exclusive Access -
3435          * All Registrants type reservation, then the command shall be completed
3436          * with RESERVATION CONFLICT status.
3437          */
3438         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3439             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3440                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3441                         " reservation for type: %s\n",
3442                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3443                 spin_unlock(&dev->dev_reservation_lock);
3444                 ret = TCM_RESERVATION_CONFLICT;
3445                 goto out;
3446         }
3447         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3448         /*
3449          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3450          */
3451         type = pr_res_holder->pr_res_type;
3452         scope = pr_res_holder->pr_res_type;
3453         /*
3454          * c) Associate the reservation key specified in the SERVICE ACTION
3455          *    RESERVATION KEY field with the I_T nexus specified as the
3456          *    destination of the register and move, where:
3457          *    A) The I_T nexus is specified by the TransportID and the
3458          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3459          *    B) Regardless of the TransportID format used, the association for
3460          *       the initiator port is based on either the initiator port name
3461          *       (see 3.1.71) on SCSI transport protocols where port names are
3462          *       required or the initiator port identifier (see 3.1.70) on SCSI
3463          *       transport protocols where port names are not required;
3464          * d) Register the reservation key specified in the SERVICE ACTION
3465          *    RESERVATION KEY field;
3466          * e) Retain the reservation key specified in the SERVICE ACTION
3467          *    RESERVATION KEY field and associated information;
3468          *
3469          * Also, It is not an error for a REGISTER AND MOVE service action to
3470          * register an I_T nexus that is already registered with the same
3471          * reservation key or a different reservation key.
3472          */
3473         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3474                                         iport_ptr);
3475         if (!dest_pr_reg) {
3476                 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3477                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
3478
3479                 spin_unlock(&dev->dev_reservation_lock);
3480                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3481                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3482                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3483                         ret = TCM_INVALID_PARAMETER_LIST;
3484                         goto out;
3485                 }
3486                 spin_lock(&dev->dev_reservation_lock);
3487                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3488                                                 iport_ptr);
3489                 new_reg = 1;
3490         }
3491         /*
3492          * f) Release the persistent reservation for the persistent reservation
3493          *    holder (i.e., the I_T nexus on which the
3494          */
3495         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3496                                           dev->dev_pr_res_holder, 0, 0);
3497         /*
3498          * g) Move the persistent reservation to the specified I_T nexus using
3499          *    the same scope and type as the persistent reservation released in
3500          *    item f); and
3501          */
3502         dev->dev_pr_res_holder = dest_pr_reg;
3503         dest_pr_reg->pr_res_holder = 1;
3504         dest_pr_reg->pr_res_type = type;
3505         pr_reg->pr_res_scope = scope;
3506         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3507         /*
3508          * Increment PRGeneration for existing registrations..
3509          */
3510         if (!new_reg)
3511                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3512         spin_unlock(&dev->dev_reservation_lock);
3513
3514         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3515                 " created new reservation holder TYPE: %s on object RTPI:"
3516                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3517                 core_scsi3_pr_dump_type(type), rtpi,
3518                 dest_pr_reg->pr_res_generation);
3519         pr_debug("SPC-3 PR Successfully moved reservation from"
3520                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3521                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3522                 i_buf, dest_tf_ops->get_fabric_name(),
3523                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3524                 iport_ptr : "");
3525         /*
3526          * It is now safe to release configfs group dependencies for destination
3527          * of Transport ID Initiator Device/Port Identifier
3528          */
3529         core_scsi3_lunacl_undepend_item(dest_se_deve);
3530         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3531         core_scsi3_tpg_undepend_item(dest_se_tpg);
3532         /*
3533          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3534          * nexus on which PERSISTENT RESERVE OUT command was received.
3535          */
3536         if (unreg) {
3537                 spin_lock(&pr_tmpl->registration_lock);
3538                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3539                 spin_unlock(&pr_tmpl->registration_lock);
3540         } else
3541                 core_scsi3_put_pr_reg(pr_reg);
3542
3543         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3544
3545         transport_kunmap_data_sg(cmd);
3546
3547         core_scsi3_put_pr_reg(dest_pr_reg);
3548         return 0;
3549 out:
3550         if (buf)
3551                 transport_kunmap_data_sg(cmd);
3552         if (dest_se_deve)
3553                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3554         if (dest_node_acl)
3555                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3556         core_scsi3_tpg_undepend_item(dest_se_tpg);
3557
3558 out_put_pr_reg:
3559         core_scsi3_put_pr_reg(pr_reg);
3560         return ret;
3561 }
3562
3563 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3564 {
3565         unsigned int __v1, __v2;
3566
3567         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3568         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3569
3570         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3571 }
3572
3573 /*
3574  * See spc4r17 section 6.14 Table 170
3575  */
3576 sense_reason_t
3577 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3578 {
3579         struct se_device *dev = cmd->se_dev;
3580         unsigned char *cdb = &cmd->t_task_cdb[0];
3581         unsigned char *buf;
3582         u64 res_key, sa_res_key;
3583         int sa, scope, type, aptpl;
3584         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3585         sense_reason_t ret;
3586
3587         /*
3588          * Following spc2r20 5.5.1 Reservations overview:
3589          *
3590          * If a logical unit has been reserved by any RESERVE command and is
3591          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3592          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3593          * initiator or service action and shall terminate with a RESERVATION
3594          * CONFLICT status.
3595          */
3596         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3597                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3598                         " SPC-2 reservation is held, returning"
3599                         " RESERVATION_CONFLICT\n");
3600                 return TCM_RESERVATION_CONFLICT;
3601         }
3602
3603         /*
3604          * FIXME: A NULL struct se_session pointer means an this is not coming from
3605          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3606          */
3607         if (!cmd->se_sess)
3608                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3609
3610         if (cmd->data_length < 24) {
3611                 pr_warn("SPC-PR: Received PR OUT parameter list"
3612                         " length too small: %u\n", cmd->data_length);
3613                 return TCM_INVALID_PARAMETER_LIST;
3614         }
3615
3616         /*
3617          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3618          */
3619         sa = (cdb[1] & 0x1f);
3620         scope = (cdb[2] & 0xf0);
3621         type = (cdb[2] & 0x0f);
3622
3623         buf = transport_kmap_data_sg(cmd);
3624         if (!buf)
3625                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3626
3627         /*
3628          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3629          */
3630         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3631         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3632         /*
3633          * REGISTER_AND_MOVE uses a different SA parameter list containing
3634          * SCSI TransportIDs.
3635          */
3636         if (sa != PRO_REGISTER_AND_MOVE) {
3637                 spec_i_pt = (buf[20] & 0x08);
3638                 all_tg_pt = (buf[20] & 0x04);
3639                 aptpl = (buf[20] & 0x01);
3640         } else {
3641                 aptpl = (buf[17] & 0x01);
3642                 unreg = (buf[17] & 0x02);
3643         }
3644         /*
3645          * If the backend device has been configured to force APTPL metadata
3646          * write-out, go ahead and propigate aptpl=1 down now.
3647          */
3648         if (dev->dev_attrib.force_pr_aptpl)
3649                 aptpl = 1;
3650
3651         transport_kunmap_data_sg(cmd);
3652         buf = NULL;
3653
3654         /*
3655          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3656          */
3657         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3658                 return TCM_INVALID_PARAMETER_LIST;
3659
3660         /*
3661          * From spc4r17 section 6.14:
3662          *
3663          * If the SPEC_I_PT bit is set to zero, the service action is not
3664          * REGISTER AND MOVE, and the parameter list length is not 24, then
3665          * the command shall be terminated with CHECK CONDITION status, with
3666          * the sense key set to ILLEGAL REQUEST, and the additional sense
3667          * code set to PARAMETER LIST LENGTH ERROR.
3668          */
3669         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3670             (cmd->data_length != 24)) {
3671                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3672                         " list length: %u\n", cmd->data_length);
3673                 return TCM_INVALID_PARAMETER_LIST;
3674         }
3675
3676         /*
3677          * (core_scsi3_emulate_pro_* function parameters
3678          * are defined by spc4r17 Table 174:
3679          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3680          */
3681         switch (sa) {
3682         case PRO_REGISTER:
3683                 ret = core_scsi3_emulate_pro_register(cmd,
3684                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3685                 break;
3686         case PRO_RESERVE:
3687                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3688                 break;
3689         case PRO_RELEASE:
3690                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3691                 break;
3692         case PRO_CLEAR:
3693                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3694                 break;
3695         case PRO_PREEMPT:
3696                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3697                                         res_key, sa_res_key, PREEMPT);
3698                 break;
3699         case PRO_PREEMPT_AND_ABORT:
3700                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3701                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3702                 break;
3703         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3704                 ret = core_scsi3_emulate_pro_register(cmd,
3705                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3706                 break;
3707         case PRO_REGISTER_AND_MOVE:
3708                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3709                                 sa_res_key, aptpl, unreg);
3710                 break;
3711         default:
3712                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3713                         " action: 0x%02x\n", cdb[1] & 0x1f);
3714                 return TCM_INVALID_CDB_FIELD;
3715         }
3716
3717         if (!ret)
3718                 target_complete_cmd(cmd, GOOD);
3719         return ret;
3720 }
3721
3722 /*
3723  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3724  *
3725  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3726  */
3727 static sense_reason_t
3728 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3729 {
3730         struct se_device *dev = cmd->se_dev;
3731         struct t10_pr_registration *pr_reg;
3732         unsigned char *buf;
3733         u32 add_len = 0, off = 8;
3734
3735         if (cmd->data_length < 8) {
3736                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3737                         " too small\n", cmd->data_length);
3738                 return TCM_INVALID_CDB_FIELD;
3739         }
3740
3741         buf = transport_kmap_data_sg(cmd);
3742         if (!buf)
3743                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3744
3745         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3746         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3747         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3748         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3749
3750         spin_lock(&dev->t10_pr.registration_lock);
3751         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3752                         pr_reg_list) {
3753                 /*
3754                  * Check for overflow of 8byte PRI READ_KEYS payload and
3755                  * next reservation key list descriptor.
3756                  */
3757                 if ((add_len + 8) > (cmd->data_length - 8))
3758                         break;
3759
3760                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3761                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3762                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3763                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3764                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3765                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3766                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3767                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3768
3769                 add_len += 8;
3770         }
3771         spin_unlock(&dev->t10_pr.registration_lock);
3772
3773         buf[4] = ((add_len >> 24) & 0xff);
3774         buf[5] = ((add_len >> 16) & 0xff);
3775         buf[6] = ((add_len >> 8) & 0xff);
3776         buf[7] = (add_len & 0xff);
3777
3778         transport_kunmap_data_sg(cmd);
3779
3780         return 0;
3781 }
3782
3783 /*
3784  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3785  *
3786  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3787  */
3788 static sense_reason_t
3789 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3790 {
3791         struct se_device *dev = cmd->se_dev;
3792         struct t10_pr_registration *pr_reg;
3793         unsigned char *buf;
3794         u64 pr_res_key;
3795         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3796
3797         if (cmd->data_length < 8) {
3798                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3799                         " too small\n", cmd->data_length);
3800                 return TCM_INVALID_CDB_FIELD;
3801         }
3802
3803         buf = transport_kmap_data_sg(cmd);
3804         if (!buf)
3805                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3806
3807         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3808         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3809         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3810         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3811
3812         spin_lock(&dev->dev_reservation_lock);
3813         pr_reg = dev->dev_pr_res_holder;
3814         if (pr_reg) {
3815                 /*
3816                  * Set the hardcoded Additional Length
3817                  */
3818                 buf[4] = ((add_len >> 24) & 0xff);
3819                 buf[5] = ((add_len >> 16) & 0xff);
3820                 buf[6] = ((add_len >> 8) & 0xff);
3821                 buf[7] = (add_len & 0xff);
3822
3823                 if (cmd->data_length < 22)
3824                         goto err;
3825
3826                 /*
3827                  * Set the Reservation key.
3828                  *
3829                  * From spc4r17, section 5.7.10:
3830                  * A persistent reservation holder has its reservation key
3831                  * returned in the parameter data from a PERSISTENT
3832                  * RESERVE IN command with READ RESERVATION service action as
3833                  * follows:
3834                  * a) For a persistent reservation of the type Write Exclusive
3835                  *    - All Registrants or Exclusive Access  All Regitrants,
3836                  *      the reservation key shall be set to zero; or
3837                  * b) For all other persistent reservation types, the
3838                  *    reservation key shall be set to the registered
3839                  *    reservation key for the I_T nexus that holds the
3840                  *    persistent reservation.
3841                  */
3842                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3843                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3844                         pr_res_key = 0;
3845                 else
3846                         pr_res_key = pr_reg->pr_res_key;
3847
3848                 buf[8] = ((pr_res_key >> 56) & 0xff);
3849                 buf[9] = ((pr_res_key >> 48) & 0xff);
3850                 buf[10] = ((pr_res_key >> 40) & 0xff);
3851                 buf[11] = ((pr_res_key >> 32) & 0xff);
3852                 buf[12] = ((pr_res_key >> 24) & 0xff);
3853                 buf[13] = ((pr_res_key >> 16) & 0xff);
3854                 buf[14] = ((pr_res_key >> 8) & 0xff);
3855                 buf[15] = (pr_res_key & 0xff);
3856                 /*
3857                  * Set the SCOPE and TYPE
3858                  */
3859                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3860                           (pr_reg->pr_res_type & 0x0f);
3861         }
3862
3863 err:
3864         spin_unlock(&dev->dev_reservation_lock);
3865         transport_kunmap_data_sg(cmd);
3866
3867         return 0;
3868 }
3869
3870 /*
3871  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3872  *
3873  * See spc4r17 section 6.13.4 Table 165
3874  */
3875 static sense_reason_t
3876 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3877 {
3878         struct se_device *dev = cmd->se_dev;
3879         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3880         unsigned char *buf;
3881         u16 add_len = 8; /* Hardcoded to 8. */
3882
3883         if (cmd->data_length < 6) {
3884                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3885                         " %u too small\n", cmd->data_length);
3886                 return TCM_INVALID_CDB_FIELD;
3887         }
3888
3889         buf = transport_kmap_data_sg(cmd);
3890         if (!buf)
3891                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3892
3893         buf[0] = ((add_len >> 8) & 0xff);
3894         buf[1] = (add_len & 0xff);
3895         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3896         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3897         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3898         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3899         /*
3900          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3901          * set the TMV: Task Mask Valid bit.
3902          */
3903         buf[3] |= 0x80;
3904         /*
3905          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3906          */
3907         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3908         /*
3909          * PTPL_A: Persistence across Target Power Loss Active bit
3910          */
3911         if (pr_tmpl->pr_aptpl_active)
3912                 buf[3] |= 0x01;
3913         /*
3914          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3915          */
3916         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3917         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3918         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3919         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3920         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3921         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3922
3923         transport_kunmap_data_sg(cmd);
3924
3925         return 0;
3926 }
3927
3928 /*
3929  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3930  *
3931  * See spc4r17 section 6.13.5 Table 168 and 169
3932  */
3933 static sense_reason_t
3934 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3935 {
3936         struct se_device *dev = cmd->se_dev;
3937         struct se_node_acl *se_nacl;
3938         struct se_portal_group *se_tpg;
3939         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3940         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3941         unsigned char *buf;
3942         u32 add_desc_len = 0, add_len = 0;
3943         u32 off = 8; /* off into first Full Status descriptor */
3944         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3945         int exp_desc_len, desc_len;
3946         bool all_reg = false;
3947
3948         if (cmd->data_length < 8) {
3949                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3950                         " too small\n", cmd->data_length);
3951                 return TCM_INVALID_CDB_FIELD;
3952         }
3953
3954         buf = transport_kmap_data_sg(cmd);
3955         if (!buf)
3956                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3957
3958         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3959         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3960         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3961         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3962
3963         spin_lock(&dev->dev_reservation_lock);
3964         if (dev->dev_pr_res_holder) {
3965                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3966
3967                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3968                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3969                         all_reg = true;
3970                         pr_res_type = pr_holder->pr_res_type;
3971                         pr_res_scope = pr_holder->pr_res_scope;
3972                 }
3973         }
3974         spin_unlock(&dev->dev_reservation_lock);
3975
3976         spin_lock(&pr_tmpl->registration_lock);
3977         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3978                         &pr_tmpl->registration_list, pr_reg_list) {
3979
3980                 se_nacl = pr_reg->pr_reg_nacl;
3981                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3982                 add_desc_len = 0;
3983
3984                 atomic_inc_mb(&pr_reg->pr_res_holders);
3985                 spin_unlock(&pr_tmpl->registration_lock);
3986                 /*
3987                  * Determine expected length of $FABRIC_MOD specific
3988                  * TransportID full status descriptor..
3989                  */
3990                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3991                                         &format_code);
3992                 if (exp_desc_len < 0 ||
3993                     exp_desc_len + add_len > cmd->data_length) {
3994                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3995                                 " out of buffer: %d\n", cmd->data_length);
3996                         spin_lock(&pr_tmpl->registration_lock);
3997                         atomic_dec_mb(&pr_reg->pr_res_holders);
3998                         break;
3999                 }
4000                 /*
4001                  * Set RESERVATION KEY
4002                  */
4003                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4004                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4005                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4006                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4007                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4008                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4009                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4010                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4011                 off += 4; /* Skip Over Reserved area */
4012
4013                 /*
4014                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4015                  */
4016                 if (pr_reg->pr_reg_all_tg_pt)
4017                         buf[off] = 0x02;
4018                 /*
4019                  * The struct se_lun pointer will be present for the
4020                  * reservation holder for PR_HOLDER bit.
4021                  *
4022                  * Also, if this registration is the reservation
4023                  * holder or there is an All Registrants reservation
4024                  * active, fill in SCOPE and TYPE in the next byte.
4025                  */
4026                 if (pr_reg->pr_res_holder) {
4027                         buf[off++] |= 0x01;
4028                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4029                                      (pr_reg->pr_res_type & 0x0f);
4030                 } else if (all_reg) {
4031                         buf[off++] |= 0x01;
4032                         buf[off++] = (pr_res_scope & 0xf0) |
4033                                      (pr_res_type & 0x0f);
4034                 } else {
4035                         off += 2;
4036                 }
4037
4038                 off += 4; /* Skip over reserved area */
4039                 /*
4040                  * From spc4r17 6.3.15:
4041                  *
4042                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4043                  * IDENTIFIER field contains the relative port identifier (see
4044                  * 3.1.120) of the target port that is part of the I_T nexus
4045                  * described by this full status descriptor. If the ALL_TG_PT
4046                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4047                  * IDENTIFIER field are not defined by this standard.
4048                  */
4049                 if (!pr_reg->pr_reg_all_tg_pt) {
4050                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
4051
4052                         buf[off++] = ((sep_rtpi >> 8) & 0xff);
4053                         buf[off++] = (sep_rtpi & 0xff);
4054                 } else
4055                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4056
4057                 buf[off+4] = se_tpg->proto_id;
4058
4059                 /*
4060                  * Now, have the $FABRIC_MOD fill in the transport ID.
4061                  */
4062                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4063                                 &format_code, &buf[off+4]);
4064
4065                 spin_lock(&pr_tmpl->registration_lock);
4066                 atomic_dec_mb(&pr_reg->pr_res_holders);
4067
4068                 if (desc_len < 0)
4069                         break;
4070                 /*
4071                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4072                  */
4073                 buf[off++] = ((desc_len >> 24) & 0xff);
4074                 buf[off++] = ((desc_len >> 16) & 0xff);
4075                 buf[off++] = ((desc_len >> 8) & 0xff);
4076                 buf[off++] = (desc_len & 0xff);
4077                 /*
4078                  * Size of full desctipor header minus TransportID
4079                  * containing $FABRIC_MOD specific) initiator device/port
4080                  * WWN information.
4081                  *
4082                  *  See spc4r17 Section 6.13.5 Table 169
4083                  */
4084                 add_desc_len = (24 + desc_len);
4085
4086                 off += desc_len;
4087                 add_len += add_desc_len;
4088         }
4089         spin_unlock(&pr_tmpl->registration_lock);
4090         /*
4091          * Set ADDITIONAL_LENGTH
4092          */
4093         buf[4] = ((add_len >> 24) & 0xff);
4094         buf[5] = ((add_len >> 16) & 0xff);
4095         buf[6] = ((add_len >> 8) & 0xff);
4096         buf[7] = (add_len & 0xff);
4097
4098         transport_kunmap_data_sg(cmd);
4099
4100         return 0;
4101 }
4102
4103 sense_reason_t
4104 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4105 {
4106         sense_reason_t ret;
4107
4108         /*
4109          * Following spc2r20 5.5.1 Reservations overview:
4110          *
4111          * If a logical unit has been reserved by any RESERVE command and is
4112          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4113          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4114          * initiator or service action and shall terminate with a RESERVATION
4115          * CONFLICT status.
4116          */
4117         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4118                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4119                         " SPC-2 reservation is held, returning"
4120                         " RESERVATION_CONFLICT\n");
4121                 return TCM_RESERVATION_CONFLICT;
4122         }
4123
4124         switch (cmd->t_task_cdb[1] & 0x1f) {
4125         case PRI_READ_KEYS:
4126                 ret = core_scsi3_pri_read_keys(cmd);
4127                 break;
4128         case PRI_READ_RESERVATION:
4129                 ret = core_scsi3_pri_read_reservation(cmd);
4130                 break;
4131         case PRI_REPORT_CAPABILITIES:
4132                 ret = core_scsi3_pri_report_capabilities(cmd);
4133                 break;
4134         case PRI_READ_FULL_STATUS:
4135                 ret = core_scsi3_pri_read_full_status(cmd);
4136                 break;
4137         default:
4138                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4139                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4140                 return TCM_INVALID_CDB_FIELD;
4141         }
4142
4143         if (!ret)
4144                 target_complete_cmd(cmd, GOOD);
4145         return ret;
4146 }
4147
4148 sense_reason_t
4149 target_check_reservation(struct se_cmd *cmd)
4150 {
4151         struct se_device *dev = cmd->se_dev;
4152         sense_reason_t ret;
4153
4154         if (!cmd->se_sess)
4155                 return 0;
4156         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4157                 return 0;
4158         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
4159                 return 0;
4160
4161         spin_lock(&dev->dev_reservation_lock);
4162         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4163                 ret = target_scsi2_reservation_check(cmd);
4164         else
4165                 ret = target_scsi3_pr_reservation_check(cmd);
4166         spin_unlock(&dev->dev_reservation_lock);
4167
4168         return ret;
4169 }