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/file.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_pr.h"
  42 #include "target_core_ua.h"
  43
  44 /*
  45  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  46  */
  47 struct pr_transport_id_holder {
  48         int dest_local_nexus;
  49         struct t10_pr_registration *dest_pr_reg;
  50         struct se_portal_group *dest_tpg;
  51         struct se_node_acl *dest_node_acl;
  52         struct se_dev_entry *dest_se_deve;
  53         struct list_head dest_list;
  54 };
  55
  56 void core_pr_dump_initiator_port(
  57         struct t10_pr_registration *pr_reg,
  58         char *buf,
  59         u32 size)
  60 {
  61         if (!pr_reg->isid_present_at_reg)
  62                 buf[0] = '\0';
  63
  64         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  65 }
  66
  67 enum register_type {
  68         REGISTER,
  69         REGISTER_AND_IGNORE_EXISTING_KEY,
  70         REGISTER_AND_MOVE,
  71 };
  72
  73 enum preempt_type {
  74         PREEMPT,
  75         PREEMPT_AND_ABORT,
  76 };
  77
  78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  79                                               struct t10_pr_registration *, int, int);
  80
  81 static sense_reason_t
  82 target_scsi2_reservation_check(struct se_cmd *cmd)
  83 {
  84         struct se_device *dev = cmd->se_dev;
  85         struct se_session *sess = cmd->se_sess;
  86
  87         switch (cmd->t_task_cdb[0]) {
  88         case INQUIRY:
  89         case RELEASE:
  90         case RELEASE_10:
  91                 return 0;
  92         default:
  93                 break;
  94         }
  95
  96         if (!dev->dev_reserved_node_acl || !sess)
  97                 return 0;
  98
  99         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 100                 return TCM_RESERVATION_CONFLICT;
 101
 102         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 103                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 104                         return TCM_RESERVATION_CONFLICT;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 111                                         struct se_node_acl *, struct se_session *);
 112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 113
 114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 115 {
 116         struct se_session *se_sess = cmd->se_sess;
 117         struct se_device *dev = cmd->se_dev;
 118         struct t10_pr_registration *pr_reg;
 119         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 120         int conflict = 0;
 121
 122         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 123                         se_sess);
 124         if (pr_reg) {
 125                 /*
 126                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 127                  * behavior
 128                  *
 129                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 130                  * status, but no reservation shall be established and the
 131                  * persistent reservation shall not be changed, if the command
 132                  * is received from a) and b) below.
 133                  *
 134                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 135                  * status, but the persistent reservation shall not be released,
 136                  * if the command is received from a) and b)
 137                  *
 138                  * a) An I_T nexus that is a persistent reservation holder; or
 139                  * b) An I_T nexus that is registered if a registrants only or
 140                  *    all registrants type persistent reservation is present.
 141                  *
 142                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 143                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 144                  * as defined in SPC-2.
 145                  */
 146                 if (pr_reg->pr_res_holder) {
 147                         core_scsi3_put_pr_reg(pr_reg);
 148                         return 1;
 149                 }
 150                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 151                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 152                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 153                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 154                         core_scsi3_put_pr_reg(pr_reg);
 155                         return 1;
 156                 }
 157                 core_scsi3_put_pr_reg(pr_reg);
 158                 conflict = 1;
 159         } else {
 160                 /*
 161                  * Following spc2r20 5.5.1 Reservations overview:
 162                  *
 163                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 164                  * command with the REGISTER or the REGISTER AND IGNORE
 165                  * EXISTING KEY service action and is still registered by any
 166                  * initiator, all RESERVE commands and all RELEASE commands
 167                  * regardless of initiator shall conflict and shall terminate
 168                  * with a RESERVATION CONFLICT status.
 169                  */
 170                 spin_lock(&pr_tmpl->registration_lock);
 171                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 172                 spin_unlock(&pr_tmpl->registration_lock);
 173         }
 174
 175         if (conflict) {
 176                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 177                         " while active SPC-3 registrations exist,"
 178                         " returning RESERVATION_CONFLICT\n");
 179                 return -EBUSY;
 180         }
 181
 182         return 0;
 183 }
 184
 185 sense_reason_t
 186 target_scsi2_reservation_release(struct se_cmd *cmd)
 187 {
 188         struct se_device *dev = cmd->se_dev;
 189         struct se_session *sess = cmd->se_sess;
 190         struct se_portal_group *tpg;
 191         int rc;
 192
 193         if (!sess || !sess->se_tpg)
 194                 goto out;
 195         rc = target_check_scsi2_reservation_conflict(cmd);
 196         if (rc == 1)
 197                 goto out;
 198         if (rc < 0)
 199                 return TCM_RESERVATION_CONFLICT;
 200
 201         spin_lock(&dev->dev_reservation_lock);
 202         if (!dev->dev_reserved_node_acl || !sess)
 203                 goto out_unlock;
 204
 205         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 206                 goto out_unlock;
 207
 208         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 209                 goto out_unlock;
 210
 211         dev->dev_reserved_node_acl = NULL;
 212         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 213         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 214                 dev->dev_res_bin_isid = 0;
 215                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 216         }
 217         tpg = sess->se_tpg;
 218         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 219                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 220                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 221                 sess->se_node_acl->initiatorname);
 222
 223 out_unlock:
 224         spin_unlock(&dev->dev_reservation_lock);
 225 out:
 226         target_complete_cmd(cmd, GOOD);
 227         return 0;
 228 }
 229
 230 sense_reason_t
 231 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 232 {
 233         struct se_device *dev = cmd->se_dev;
 234         struct se_session *sess = cmd->se_sess;
 235         struct se_portal_group *tpg;
 236         sense_reason_t ret = 0;
 237         int rc;
 238
 239         if ((cmd->t_task_cdb[1] & 0x01) &&
 240             (cmd->t_task_cdb[1] & 0x02)) {
 241                 pr_err("LongIO and Obselete Bits set, returning"
 242                                 " ILLEGAL_REQUEST\n");
 243                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 244         }
 245         /*
 246          * This is currently the case for target_core_mod passthrough struct se_cmd
 247          * ops
 248          */
 249         if (!sess || !sess->se_tpg)
 250                 goto out;
 251         rc = target_check_scsi2_reservation_conflict(cmd);
 252         if (rc == 1)
 253                 goto out;
 254
 255         if (rc < 0)
 256                 return TCM_RESERVATION_CONFLICT;
 257
 258         tpg = sess->se_tpg;
 259         spin_lock(&dev->dev_reservation_lock);
 260         if (dev->dev_reserved_node_acl &&
 261            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 262                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 263                         tpg->se_tpg_tfo->get_fabric_name());
 264                 pr_err("Original reserver LUN: %u %s\n",
 265                         cmd->se_lun->unpacked_lun,
 266                         dev->dev_reserved_node_acl->initiatorname);
 267                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 268                         " from %s \n", cmd->se_lun->unpacked_lun,
 269                         cmd->se_deve->mapped_lun,
 270                         sess->se_node_acl->initiatorname);
 271                 ret = TCM_RESERVATION_CONFLICT;
 272                 goto out_unlock;
 273         }
 274
 275         dev->dev_reserved_node_acl = sess->se_node_acl;
 276         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 277         if (sess->sess_bin_isid != 0) {
 278                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 279                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 280         }
 281         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 282                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 283                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 284                 sess->se_node_acl->initiatorname);
 285
 286 out_unlock:
 287         spin_unlock(&dev->dev_reservation_lock);
 288 out:
 289         if (!ret)
 290                 target_complete_cmd(cmd, GOOD);
 291         return ret;
 292 }
 293
 294
 295 /*
 296  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 297  *
 298  * This function is called by those initiator ports who are *NOT*
 299  * the active PR reservation holder when a reservation is present.
 300  */
 301 static int core_scsi3_pr_seq_non_holder(
 302         struct se_cmd *cmd,
 303         u32 pr_reg_type)
 304 {
 305         unsigned char *cdb = cmd->t_task_cdb;
 306         struct se_dev_entry *se_deve;
 307         struct se_session *se_sess = cmd->se_sess;
 308         int other_cdb = 0, ignore_reg;
 309         int registered_nexus = 0, ret = 1; /* Conflict by default */
 310         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 311         int we = 0; /* Write Exclusive */
 312         int legacy = 0; /* Act like a legacy device and return
 313                          * RESERVATION CONFLICT on some CDBs */
 314
 315         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 316         /*
 317          * Determine if the registration should be ignored due to
 318          * non-matching ISIDs in target_scsi3_pr_reservation_check().
 319          */
 320         ignore_reg = (pr_reg_type & 0x80000000);
 321         if (ignore_reg)
 322                 pr_reg_type &= ~0x80000000;
 323
 324         switch (pr_reg_type) {
 325         case PR_TYPE_WRITE_EXCLUSIVE:
 326                 we = 1;
 327         case PR_TYPE_EXCLUSIVE_ACCESS:
 328                 /*
 329                  * Some commands are only allowed for the persistent reservation
 330                  * holder.
 331                  */
 332                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 333                         registered_nexus = 1;
 334                 break;
 335         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 336                 we = 1;
 337         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 338                 /*
 339                  * Some commands are only allowed for registered I_T Nexuses.
 340                  */
 341                 reg_only = 1;
 342                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 343                         registered_nexus = 1;
 344                 break;
 345         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 346                 we = 1;
 347         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 348                 /*
 349                  * Each registered I_T Nexus is a reservation holder.
 350                  */
 351                 all_reg = 1;
 352                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 353                         registered_nexus = 1;
 354                 break;
 355         default:
 356                 return -EINVAL;
 357         }
 358         /*
 359          * Referenced from spc4r17 table 45 for *NON* PR holder access
 360          */
 361         switch (cdb[0]) {
 362         case SECURITY_PROTOCOL_IN:
 363                 if (registered_nexus)
 364                         return 0;
 365                 ret = (we) ? 0 : 1;
 366                 break;
 367         case MODE_SENSE:
 368         case MODE_SENSE_10:
 369         case READ_ATTRIBUTE:
 370         case READ_BUFFER:
 371         case RECEIVE_DIAGNOSTIC:
 372                 if (legacy) {
 373                         ret = 1;
 374                         break;
 375                 }
 376                 if (registered_nexus) {
 377                         ret = 0;
 378                         break;
 379                 }
 380                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 381                 break;
 382         case PERSISTENT_RESERVE_OUT:
 383                 /*
 384                  * This follows PERSISTENT_RESERVE_OUT service actions that
 385                  * are allowed in the presence of various reservations.
 386                  * See spc4r17, table 46
 387                  */
 388                 switch (cdb[1] & 0x1f) {
 389                 case PRO_CLEAR:
 390                 case PRO_PREEMPT:
 391                 case PRO_PREEMPT_AND_ABORT:
 392                         ret = (registered_nexus) ? 0 : 1;
 393                         break;
 394                 case PRO_REGISTER:
 395                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 396                         ret = 0;
 397                         break;
 398                 case PRO_REGISTER_AND_MOVE:
 399                 case PRO_RESERVE:
 400                         ret = 1;
 401                         break;
 402                 case PRO_RELEASE:
 403                         ret = (registered_nexus) ? 0 : 1;
 404                         break;
 405                 default:
 406                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 407                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 408                         return -EINVAL;
 409                 }
 410                 break;
 411         case RELEASE:
 412         case RELEASE_10:
 413                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 414                 ret = 0;
 415                 break;
 416         case RESERVE:
 417         case RESERVE_10:
 418                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 419                 ret = 0;
 420                 break;
 421         case TEST_UNIT_READY:
 422                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 423                 break;
 424         case MAINTENANCE_IN:
 425                 switch (cdb[1] & 0x1f) {
 426                 case MI_MANAGEMENT_PROTOCOL_IN:
 427                         if (registered_nexus) {
 428                                 ret = 0;
 429                                 break;
 430                         }
 431                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 432                         break;
 433                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 434                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 435                         if (legacy) {
 436                                 ret = 1;
 437                                 break;
 438                         }
 439                         if (registered_nexus) {
 440                                 ret = 0;
 441                                 break;
 442                         }
 443                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 444                         break;
 445                 case MI_REPORT_ALIASES:
 446                 case MI_REPORT_IDENTIFYING_INFORMATION:
 447                 case MI_REPORT_PRIORITY:
 448                 case MI_REPORT_TARGET_PGS:
 449                 case MI_REPORT_TIMESTAMP:
 450                         ret = 0; /* Allowed */
 451                         break;
 452                 default:
 453                         pr_err("Unknown MI Service Action: 0x%02x\n",
 454                                 (cdb[1] & 0x1f));
 455                         return -EINVAL;
 456                 }
 457                 break;
 458         case ACCESS_CONTROL_IN:
 459         case ACCESS_CONTROL_OUT:
 460         case INQUIRY:
 461         case LOG_SENSE:
 462         case SERVICE_ACTION_IN_12:
 463         case REPORT_LUNS:
 464         case REQUEST_SENSE:
 465         case PERSISTENT_RESERVE_IN:
 466                 ret = 0; /*/ Allowed CDBs */
 467                 break;
 468         default:
 469                 other_cdb = 1;
 470                 break;
 471         }
 472         /*
 473          * Case where the CDB is explicitly allowed in the above switch
 474          * statement.
 475          */
 476         if (!ret && !other_cdb) {
 477                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 478                         " reservation holder\n", cdb[0],
 479                         core_scsi3_pr_dump_type(pr_reg_type));
 480
 481                 return ret;
 482         }
 483         /*
 484          * Check if write exclusive initiator ports *NOT* holding the
 485          * WRITE_EXCLUSIVE_* reservation.
 486          */
 487         if (we && !registered_nexus) {
 488                 if (cmd->data_direction == DMA_TO_DEVICE) {
 489                         /*
 490                          * Conflict for write exclusive
 491                          */
 492                         pr_debug("%s Conflict for unregistered nexus"
 493                                 " %s CDB: 0x%02x to %s reservation\n",
 494                                 transport_dump_cmd_direction(cmd),
 495                                 se_sess->se_node_acl->initiatorname, cdb[0],
 496                                 core_scsi3_pr_dump_type(pr_reg_type));
 497                         return 1;
 498                 } else {
 499                         /*
 500                          * Allow non WRITE CDBs for all Write Exclusive
 501                          * PR TYPEs to pass for registered and
 502                          * non-registered_nexuxes NOT holding the reservation.
 503                          *
 504                          * We only make noise for the unregisterd nexuses,
 505                          * as we expect registered non-reservation holding
 506                          * nexuses to issue CDBs.
 507                          */
 508
 509                         if (!registered_nexus) {
 510                                 pr_debug("Allowing implicit CDB: 0x%02x"
 511                                         " for %s reservation on unregistered"
 512                                         " nexus\n", cdb[0],
 513                                         core_scsi3_pr_dump_type(pr_reg_type));
 514                         }
 515
 516                         return 0;
 517                 }
 518         } else if ((reg_only) || (all_reg)) {
 519                 if (registered_nexus) {
 520                         /*
 521                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 522                          * allow commands from registered nexuses.
 523                          */
 524
 525                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 526                                 " reservation\n", cdb[0],
 527                                 core_scsi3_pr_dump_type(pr_reg_type));
 528
 529                         return 0;
 530                 }
 531        } else if (we && registered_nexus) {
 532                /*
 533                 * Reads are allowed for Write Exclusive locks
 534                 * from all registrants.
 535                 */
 536                if (cmd->data_direction == DMA_FROM_DEVICE) {
 537                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 538                                " reservation\n", cdb[0],
 539                                core_scsi3_pr_dump_type(pr_reg_type));
 540
 541                        return 0;
 542                }
 543         }
 544         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 545                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 546                 (registered_nexus) ? "" : "un",
 547                 se_sess->se_node_acl->initiatorname, cdb[0],
 548                 core_scsi3_pr_dump_type(pr_reg_type));
 549
 550         return 1; /* Conflict by default */
 551 }
 552
 553 static sense_reason_t
 554 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 555 {
 556         struct se_device *dev = cmd->se_dev;
 557         struct se_session *sess = cmd->se_sess;
 558         u32 pr_reg_type;
 559
 560         if (!dev->dev_pr_res_holder)
 561                 return 0;
 562
 563         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 564         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 565         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 566                 goto check_nonholder;
 567
 568         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 569                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 570                     sess->sess_bin_isid) {
 571                         pr_reg_type |= 0x80000000;
 572                         goto check_nonholder;
 573                 }
 574         }
 575
 576         return 0;
 577
 578 check_nonholder:
 579         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
 580                 return TCM_RESERVATION_CONFLICT;
 581         return 0;
 582 }
 583
 584 static u32 core_scsi3_pr_generation(struct se_device *dev)
 585 {
 586         u32 prg;
 587
 588         /*
 589          * PRGeneration field shall contain the value of a 32-bit wrapping
 590          * counter mainted by the device server.
 591          *
 592          * Note that this is done regardless of Active Persist across
 593          * Target PowerLoss (APTPL)
 594          *
 595          * See spc4r17 section 6.3.12 READ_KEYS service action
 596          */
 597         spin_lock(&dev->dev_reservation_lock);
 598         prg = dev->t10_pr.pr_generation++;
 599         spin_unlock(&dev->dev_reservation_lock);
 600
 601         return prg;
 602 }
 603
 604 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 605         struct se_device *dev,
 606         struct se_node_acl *nacl,
 607         struct se_dev_entry *deve,
 608         unsigned char *isid,
 609         u64 sa_res_key,
 610         int all_tg_pt,
 611         int aptpl)
 612 {
 613         struct t10_pr_registration *pr_reg;
 614
 615         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 616         if (!pr_reg) {
 617                 pr_err("Unable to allocate struct t10_pr_registration\n");
 618                 return NULL;
 619         }
 620
 621         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 622         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 623         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 624         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 625         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 626         atomic_set(&pr_reg->pr_res_holders, 0);
 627         pr_reg->pr_reg_nacl = nacl;
 628         pr_reg->pr_reg_deve = deve;
 629         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 630         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 631         pr_reg->pr_res_key = sa_res_key;
 632         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 633         pr_reg->pr_reg_aptpl = aptpl;
 634         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 635         /*
 636          * If an ISID value for this SCSI Initiator Port exists,
 637          * save it to the registration now.
 638          */
 639         if (isid != NULL) {
 640                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 641                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 642                 pr_reg->isid_present_at_reg = 1;
 643         }
 644
 645         return pr_reg;
 646 }
 647
 648 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 649 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 650
 651 /*
 652  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 653  * modes.
 654  */
 655 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 656         struct se_device *dev,
 657         struct se_node_acl *nacl,
 658         struct se_dev_entry *deve,
 659         unsigned char *isid,
 660         u64 sa_res_key,
 661         int all_tg_pt,
 662         int aptpl)
 663 {
 664         struct se_dev_entry *deve_tmp;
 665         struct se_node_acl *nacl_tmp;
 666         struct se_port *port, *port_tmp;
 667         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 668         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 669         int ret;
 670         /*
 671          * Create a registration for the I_T Nexus upon which the
 672          * PROUT REGISTER was received.
 673          */
 674         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 675                         sa_res_key, all_tg_pt, aptpl);
 676         if (!pr_reg)
 677                 return NULL;
 678         /*
 679          * Return pointer to pr_reg for ALL_TG_PT=0
 680          */
 681         if (!all_tg_pt)
 682                 return pr_reg;
 683         /*
 684          * Create list of matching SCSI Initiator Port registrations
 685          * for ALL_TG_PT=1
 686          */
 687         spin_lock(&dev->se_port_lock);
 688         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 689                 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
 690                 spin_unlock(&dev->se_port_lock);
 691
 692                 spin_lock_bh(&port->sep_alua_lock);
 693                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 694                                         alua_port_list) {
 695                         /*
 696                          * This pointer will be NULL for demo mode MappedLUNs
 697                          * that have not been make explicit via a ConfigFS
 698                          * MappedLUN group for the SCSI Initiator Node ACL.
 699                          */
 700                         if (!deve_tmp->se_lun_acl)
 701                                 continue;
 702
 703                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 704                         /*
 705                          * Skip the matching struct se_node_acl that is allocated
 706                          * above..
 707                          */
 708                         if (nacl == nacl_tmp)
 709                                 continue;
 710                         /*
 711                          * Only perform PR registrations for target ports on
 712                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 713                          * arrived.
 714                          */
 715                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 716                                 continue;
 717                         /*
 718                          * Look for a matching Initiator Node ACL in ASCII format
 719                          */
 720                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 721                                 continue;
 722
 723                         atomic_inc_mb(&deve_tmp->pr_ref_count);
 724                         spin_unlock_bh(&port->sep_alua_lock);
 725                         /*
 726                          * Grab a configfs group dependency that is released
 727                          * for the exception path at label out: below, or upon
 728                          * completion of adding ALL_TG_PT=1 registrations in
 729                          * __core_scsi3_add_registration()
 730                          */
 731                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 732                         if (ret < 0) {
 733                                 pr_err("core_scsi3_lunacl_depend"
 734                                                 "_item() failed\n");
 735                                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 736                                 atomic_dec_mb(&deve_tmp->pr_ref_count);
 737                                 goto out;
 738                         }
 739                         /*
 740                          * Located a matching SCSI Initiator Port on a different
 741                          * port, allocate the pr_reg_atp and attach it to the
 742                          * pr_reg->pr_reg_atp_list that will be processed once
 743                          * the original *pr_reg is processed in
 744                          * __core_scsi3_add_registration()
 745                          */
 746                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 747                                                 nacl_tmp, deve_tmp, NULL,
 748                                                 sa_res_key, all_tg_pt, aptpl);
 749                         if (!pr_reg_atp) {
 750                                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 751                                 atomic_dec_mb(&deve_tmp->pr_ref_count);
 752                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 753                                 goto out;
 754                         }
 755
 756                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 757                                       &pr_reg->pr_reg_atp_list);
 758                         spin_lock_bh(&port->sep_alua_lock);
 759                 }
 760                 spin_unlock_bh(&port->sep_alua_lock);
 761
 762                 spin_lock(&dev->se_port_lock);
 763                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 764         }
 765         spin_unlock(&dev->se_port_lock);
 766
 767         return pr_reg;
 768 out:
 769         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 770                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 771                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 772                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 773                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 774         }
 775         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 776         return NULL;
 777 }
 778
 779 int core_scsi3_alloc_aptpl_registration(
 780         struct t10_reservation *pr_tmpl,
 781         u64 sa_res_key,
 782         unsigned char *i_port,
 783         unsigned char *isid,
 784         u32 mapped_lun,
 785         unsigned char *t_port,
 786         u16 tpgt,
 787         u32 target_lun,
 788         int res_holder,
 789         int all_tg_pt,
 790         u8 type)
 791 {
 792         struct t10_pr_registration *pr_reg;
 793
 794         if (!i_port || !t_port || !sa_res_key) {
 795                 pr_err("Illegal parameters for APTPL registration\n");
 796                 return -EINVAL;
 797         }
 798
 799         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 800         if (!pr_reg) {
 801                 pr_err("Unable to allocate struct t10_pr_registration\n");
 802                 return -ENOMEM;
 803         }
 804
 805         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 806         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 807         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 808         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 809         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 810         atomic_set(&pr_reg->pr_res_holders, 0);
 811         pr_reg->pr_reg_nacl = NULL;
 812         pr_reg->pr_reg_deve = NULL;
 813         pr_reg->pr_res_mapped_lun = mapped_lun;
 814         pr_reg->pr_aptpl_target_lun = target_lun;
 815         pr_reg->pr_res_key = sa_res_key;
 816         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 817         pr_reg->pr_reg_aptpl = 1;
 818         pr_reg->pr_reg_tg_pt_lun = NULL;
 819         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 820         pr_reg->pr_res_type = type;
 821         /*
 822          * If an ISID value had been saved in APTPL metadata for this
 823          * SCSI Initiator Port, restore it now.
 824          */
 825         if (isid != NULL) {
 826                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 827                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 828                 pr_reg->isid_present_at_reg = 1;
 829         }
 830         /*
 831          * Copy the i_port and t_port information from caller.
 832          */
 833         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 834         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 835         pr_reg->pr_reg_tpgt = tpgt;
 836         /*
 837          * Set pr_res_holder from caller, the pr_reg who is the reservation
 838          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 839          * the Initiator Node LUN ACL from the fabric module is created for
 840          * this registration.
 841          */
 842         pr_reg->pr_res_holder = res_holder;
 843
 844         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 845         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 846                         " metadata\n", (res_holder) ? "+reservation" : "");
 847         return 0;
 848 }
 849
 850 static void core_scsi3_aptpl_reserve(
 851         struct se_device *dev,
 852         struct se_portal_group *tpg,
 853         struct se_node_acl *node_acl,
 854         struct t10_pr_registration *pr_reg)
 855 {
 856         char i_buf[PR_REG_ISID_ID_LEN];
 857
 858         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 859         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 860
 861         spin_lock(&dev->dev_reservation_lock);
 862         dev->dev_pr_res_holder = pr_reg;
 863         spin_unlock(&dev->dev_reservation_lock);
 864
 865         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 866                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 867                 tpg->se_tpg_tfo->get_fabric_name(),
 868                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 869                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 870         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 871                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 872                 i_buf);
 873 }
 874
 875 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 876                                 struct t10_pr_registration *, enum register_type, int);
 877
 878 static int __core_scsi3_check_aptpl_registration(
 879         struct se_device *dev,
 880         struct se_portal_group *tpg,
 881         struct se_lun *lun,
 882         u32 target_lun,
 883         struct se_node_acl *nacl,
 884         struct se_dev_entry *deve)
 885 {
 886         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 887         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 888         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 889         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 890         u16 tpgt;
 891
 892         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 893         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 894         /*
 895          * Copy Initiator Port information from struct se_node_acl
 896          */
 897         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 898         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 899                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 900         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 901         /*
 902          * Look for the matching registrations+reservation from those
 903          * created from APTPL metadata.  Note that multiple registrations
 904          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 905          * TransportIDs.
 906          */
 907         spin_lock(&pr_tmpl->aptpl_reg_lock);
 908         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 909                                 pr_reg_aptpl_list) {
 910
 911                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 912                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 913                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 914                      (pr_reg->pr_reg_tpgt == tpgt) &&
 915                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 916
 917                         pr_reg->pr_reg_nacl = nacl;
 918                         pr_reg->pr_reg_deve = deve;
 919                         pr_reg->pr_reg_tg_pt_lun = lun;
 920
 921                         list_del(&pr_reg->pr_reg_aptpl_list);
 922                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 923                         /*
 924                          * At this point all of the pointers in *pr_reg will
 925                          * be setup, so go ahead and add the registration.
 926                          */
 927
 928                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 929                         /*
 930                          * If this registration is the reservation holder,
 931                          * make that happen now..
 932                          */
 933                         if (pr_reg->pr_res_holder)
 934                                 core_scsi3_aptpl_reserve(dev, tpg,
 935                                                 nacl, pr_reg);
 936                         /*
 937                          * Reenable pr_aptpl_active to accept new metadata
 938                          * updates once the SCSI device is active again..
 939                          */
 940                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 941                         pr_tmpl->pr_aptpl_active = 1;
 942                 }
 943         }
 944         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 945
 946         return 0;
 947 }
 948
 949 int core_scsi3_check_aptpl_registration(
 950         struct se_device *dev,
 951         struct se_portal_group *tpg,
 952         struct se_lun *lun,
 953         struct se_node_acl *nacl,
 954         u32 mapped_lun)
 955 {
 956         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 957
 958         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
 959                 return 0;
 960
 961         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 962                                 lun->unpacked_lun, nacl, deve);
 963 }
 964
 965 static void __core_scsi3_dump_registration(
 966         struct target_core_fabric_ops *tfo,
 967         struct se_device *dev,
 968         struct se_node_acl *nacl,
 969         struct t10_pr_registration *pr_reg,
 970         enum register_type register_type)
 971 {
 972         struct se_portal_group *se_tpg = nacl->se_tpg;
 973         char i_buf[PR_REG_ISID_ID_LEN];
 974
 975         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
 976         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 977
 978         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
 979                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
 980                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
 981                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
 982                 i_buf);
 983         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
 984                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
 985                 tfo->tpg_get_tag(se_tpg));
 986         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
 987                 " Port(s)\n",  tfo->get_fabric_name(),
 988                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
 989                 dev->transport->name);
 990         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
 991                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
 992                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
 993                 pr_reg->pr_reg_aptpl);
 994 }
 995
 996 /*
 997  * this function can be called with struct se_device->dev_reservation_lock
 998  * when register_move = 1
 999  */
1000 static void __core_scsi3_add_registration(
1001         struct se_device *dev,
1002         struct se_node_acl *nacl,
1003         struct t10_pr_registration *pr_reg,
1004         enum register_type register_type,
1005         int register_move)
1006 {
1007         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1008         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1009         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1010
1011         /*
1012          * Increment PRgeneration counter for struct se_device upon a successful
1013          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1014          *
1015          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1016          * action, the struct se_device->dev_reservation_lock will already be held,
1017          * so we do not call core_scsi3_pr_generation() which grabs the lock
1018          * for the REGISTER.
1019          */
1020         pr_reg->pr_res_generation = (register_move) ?
1021                         dev->t10_pr.pr_generation++ :
1022                         core_scsi3_pr_generation(dev);
1023
1024         spin_lock(&pr_tmpl->registration_lock);
1025         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1026         pr_reg->pr_reg_deve->def_pr_registered = 1;
1027
1028         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1029         spin_unlock(&pr_tmpl->registration_lock);
1030         /*
1031          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1032          */
1033         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1034                 return;
1035         /*
1036          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1037          * allocated in __core_scsi3_alloc_registration()
1038          */
1039         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1040                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1041                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1042
1043                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1044
1045                 spin_lock(&pr_tmpl->registration_lock);
1046                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1047                               &pr_tmpl->registration_list);
1048                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1049
1050                 __core_scsi3_dump_registration(tfo, dev,
1051                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1052                                 register_type);
1053                 spin_unlock(&pr_tmpl->registration_lock);
1054                 /*
1055                  * Drop configfs group dependency reference from
1056                  * __core_scsi3_alloc_registration()
1057                  */
1058                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1059         }
1060 }
1061
1062 static int core_scsi3_alloc_registration(
1063         struct se_device *dev,
1064         struct se_node_acl *nacl,
1065         struct se_dev_entry *deve,
1066         unsigned char *isid,
1067         u64 sa_res_key,
1068         int all_tg_pt,
1069         int aptpl,
1070         enum register_type register_type,
1071         int register_move)
1072 {
1073         struct t10_pr_registration *pr_reg;
1074
1075         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1076                         sa_res_key, all_tg_pt, aptpl);
1077         if (!pr_reg)
1078                 return -EPERM;
1079
1080         __core_scsi3_add_registration(dev, nacl, pr_reg,
1081                         register_type, register_move);
1082         return 0;
1083 }
1084
1085 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1086         struct se_device *dev,
1087         struct se_node_acl *nacl,
1088         unsigned char *isid)
1089 {
1090         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1091         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1092         struct se_portal_group *tpg;
1093
1094         spin_lock(&pr_tmpl->registration_lock);
1095         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1096                         &pr_tmpl->registration_list, pr_reg_list) {
1097                 /*
1098                  * First look for a matching struct se_node_acl
1099                  */
1100                 if (pr_reg->pr_reg_nacl != nacl)
1101                         continue;
1102
1103                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1104                 /*
1105                  * If this registration does NOT contain a fabric provided
1106                  * ISID, then we have found a match.
1107                  */
1108                 if (!pr_reg->isid_present_at_reg) {
1109                         /*
1110                          * Determine if this SCSI device server requires that
1111                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1112                          * for fabric modules (iSCSI) requiring them.
1113                          */
1114                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1115                                 if (dev->dev_attrib.enforce_pr_isids)
1116                                         continue;
1117                         }
1118                         atomic_inc_mb(&pr_reg->pr_res_holders);
1119                         spin_unlock(&pr_tmpl->registration_lock);
1120                         return pr_reg;
1121                 }
1122                 /*
1123                  * If the *pr_reg contains a fabric defined ISID for multi-value
1124                  * SCSI Initiator Port TransportIDs, then we expect a valid
1125                  * matching ISID to be provided by the local SCSI Initiator Port.
1126                  */
1127                 if (!isid)
1128                         continue;
1129                 if (strcmp(isid, pr_reg->pr_reg_isid))
1130                         continue;
1131
1132                 atomic_inc_mb(&pr_reg->pr_res_holders);
1133                 spin_unlock(&pr_tmpl->registration_lock);
1134                 return pr_reg;
1135         }
1136         spin_unlock(&pr_tmpl->registration_lock);
1137
1138         return NULL;
1139 }
1140
1141 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1142         struct se_device *dev,
1143         struct se_node_acl *nacl,
1144         struct se_session *sess)
1145 {
1146         struct se_portal_group *tpg = nacl->se_tpg;
1147         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1148
1149         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1150                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1151                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1152                                         PR_REG_ISID_LEN);
1153                 isid_ptr = &buf[0];
1154         }
1155
1156         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1157 }
1158
1159 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1160 {
1161         atomic_dec_mb(&pr_reg->pr_res_holders);
1162 }
1163
1164 static int core_scsi3_check_implicit_release(
1165         struct se_device *dev,
1166         struct t10_pr_registration *pr_reg)
1167 {
1168         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1169         struct t10_pr_registration *pr_res_holder;
1170         int ret = 0;
1171
1172         spin_lock(&dev->dev_reservation_lock);
1173         pr_res_holder = dev->dev_pr_res_holder;
1174         if (!pr_res_holder) {
1175                 spin_unlock(&dev->dev_reservation_lock);
1176                 return ret;
1177         }
1178         if (pr_res_holder == pr_reg) {
1179                 /*
1180                  * Perform an implicit RELEASE if the registration that
1181                  * is being released is holding the reservation.
1182                  *
1183                  * From spc4r17, section 5.7.11.1:
1184                  *
1185                  * e) If the I_T nexus is the persistent reservation holder
1186                  *    and the persistent reservation is not an all registrants
1187                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1188                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1189                  *    service action with the SERVICE ACTION RESERVATION KEY
1190                  *    field set to zero (see 5.7.11.3).
1191                  */
1192                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1193                 ret = 1;
1194                 /*
1195                  * For 'All Registrants' reservation types, all existing
1196                  * registrations are still processed as reservation holders
1197                  * in core_scsi3_pr_seq_non_holder() after the initial
1198                  * reservation holder is implicitly released here.
1199                  */
1200         } else if (pr_reg->pr_reg_all_tg_pt &&
1201                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1202                           pr_reg->pr_reg_nacl->initiatorname)) &&
1203                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1204                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1205                         " UNREGISTER while existing reservation with matching"
1206                         " key 0x%016Lx is present from another SCSI Initiator"
1207                         " Port\n", pr_reg->pr_res_key);
1208                 ret = -EPERM;
1209         }
1210         spin_unlock(&dev->dev_reservation_lock);
1211
1212         return ret;
1213 }
1214
1215 /*
1216  * Called with struct t10_reservation->registration_lock held.
1217  */
1218 static void __core_scsi3_free_registration(
1219         struct se_device *dev,
1220         struct t10_pr_registration *pr_reg,
1221         struct list_head *preempt_and_abort_list,
1222         int dec_holders)
1223 {
1224         struct target_core_fabric_ops *tfo =
1225                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1226         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1227         char i_buf[PR_REG_ISID_ID_LEN];
1228
1229         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1230         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1231
1232         pr_reg->pr_reg_deve->def_pr_registered = 0;
1233         pr_reg->pr_reg_deve->pr_res_key = 0;
1234         if (!list_empty(&pr_reg->pr_reg_list))
1235                 list_del(&pr_reg->pr_reg_list);
1236         /*
1237          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1238          * so call core_scsi3_put_pr_reg() to decrement our reference.
1239          */
1240         if (dec_holders)
1241                 core_scsi3_put_pr_reg(pr_reg);
1242         /*
1243          * Wait until all reference from any other I_T nexuses for this
1244          * *pr_reg have been released.  Because list_del() is called above,
1245          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1246          * count back to zero, and we release *pr_reg.
1247          */
1248         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1249                 spin_unlock(&pr_tmpl->registration_lock);
1250                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1251                                 tfo->get_fabric_name());
1252                 cpu_relax();
1253                 spin_lock(&pr_tmpl->registration_lock);
1254         }
1255
1256         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1257                 " Node: %s%s\n", tfo->get_fabric_name(),
1258                 pr_reg->pr_reg_nacl->initiatorname,
1259                 i_buf);
1260         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1261                 " Port(s)\n", tfo->get_fabric_name(),
1262                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1263                 dev->transport->name);
1264         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1265                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1266                 pr_reg->pr_res_generation);
1267
1268         if (!preempt_and_abort_list) {
1269                 pr_reg->pr_reg_deve = NULL;
1270                 pr_reg->pr_reg_nacl = NULL;
1271                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1272                 return;
1273         }
1274         /*
1275          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1276          * are released once the ABORT_TASK_SET has completed..
1277          */
1278         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1279 }
1280
1281 void core_scsi3_free_pr_reg_from_nacl(
1282         struct se_device *dev,
1283         struct se_node_acl *nacl)
1284 {
1285         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1286         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1287         bool free_reg = false;
1288         /*
1289          * If the passed se_node_acl matches the reservation holder,
1290          * release the reservation.
1291          */
1292         spin_lock(&dev->dev_reservation_lock);
1293         pr_res_holder = dev->dev_pr_res_holder;
1294         if ((pr_res_holder != NULL) &&
1295             (pr_res_holder->pr_reg_nacl == nacl)) {
1296                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1297                 free_reg = true;
1298         }
1299         spin_unlock(&dev->dev_reservation_lock);
1300         /*
1301          * Release any registration associated with the struct se_node_acl.
1302          */
1303         spin_lock(&pr_tmpl->registration_lock);
1304         if (pr_res_holder && free_reg)
1305                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1306
1307         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1308                         &pr_tmpl->registration_list, pr_reg_list) {
1309
1310                 if (pr_reg->pr_reg_nacl != nacl)
1311                         continue;
1312
1313                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1314         }
1315         spin_unlock(&pr_tmpl->registration_lock);
1316 }
1317
1318 void core_scsi3_free_all_registrations(
1319         struct se_device *dev)
1320 {
1321         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1322         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323
1324         spin_lock(&dev->dev_reservation_lock);
1325         pr_res_holder = dev->dev_pr_res_holder;
1326         if (pr_res_holder != NULL) {
1327                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1328                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1329                                                   pr_res_holder, 0, 0);
1330         }
1331         spin_unlock(&dev->dev_reservation_lock);
1332
1333         spin_lock(&pr_tmpl->registration_lock);
1334         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1335                         &pr_tmpl->registration_list, pr_reg_list) {
1336
1337                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1338         }
1339         spin_unlock(&pr_tmpl->registration_lock);
1340
1341         spin_lock(&pr_tmpl->aptpl_reg_lock);
1342         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1343                                 pr_reg_aptpl_list) {
1344                 list_del(&pr_reg->pr_reg_aptpl_list);
1345                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1346         }
1347         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1348 }
1349
1350 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1351 {
1352         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1353                         &tpg->tpg_group.cg_item);
1354 }
1355
1356 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1357 {
1358         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1359                         &tpg->tpg_group.cg_item);
1360
1361         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1362 }
1363
1364 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1365 {
1366         struct se_portal_group *tpg = nacl->se_tpg;
1367
1368         if (nacl->dynamic_node_acl)
1369                 return 0;
1370
1371         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1372                         &nacl->acl_group.cg_item);
1373 }
1374
1375 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1376 {
1377         struct se_portal_group *tpg = nacl->se_tpg;
1378
1379         if (nacl->dynamic_node_acl) {
1380                 atomic_dec_mb(&nacl->acl_pr_ref_count);
1381                 return;
1382         }
1383
1384         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1385                         &nacl->acl_group.cg_item);
1386
1387         atomic_dec_mb(&nacl->acl_pr_ref_count);
1388 }
1389
1390 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1391 {
1392         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1393         struct se_node_acl *nacl;
1394         struct se_portal_group *tpg;
1395         /*
1396          * For nacl->dynamic_node_acl=1
1397          */
1398         if (!lun_acl)
1399                 return 0;
1400
1401         nacl = lun_acl->se_lun_nacl;
1402         tpg = nacl->se_tpg;
1403
1404         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1405                         &lun_acl->se_lun_group.cg_item);
1406 }
1407
1408 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1409 {
1410         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1411         struct se_node_acl *nacl;
1412         struct se_portal_group *tpg;
1413         /*
1414          * For nacl->dynamic_node_acl=1
1415          */
1416         if (!lun_acl) {
1417                 atomic_dec_mb(&se_deve->pr_ref_count);
1418                 return;
1419         }
1420         nacl = lun_acl->se_lun_nacl;
1421         tpg = nacl->se_tpg;
1422
1423         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1424                         &lun_acl->se_lun_group.cg_item);
1425
1426         atomic_dec_mb(&se_deve->pr_ref_count);
1427 }
1428
1429 static sense_reason_t
1430 core_scsi3_decode_spec_i_port(
1431         struct se_cmd *cmd,
1432         struct se_portal_group *tpg,
1433         unsigned char *l_isid,
1434         u64 sa_res_key,
1435         int all_tg_pt,
1436         int aptpl)
1437 {
1438         struct se_device *dev = cmd->se_dev;
1439         struct se_port *tmp_port;
1440         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1441         struct se_session *se_sess = cmd->se_sess;
1442         struct se_node_acl *dest_node_acl = NULL;
1443         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1444         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1445         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1446         LIST_HEAD(tid_dest_list);
1447         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1448         struct target_core_fabric_ops *tmp_tf_ops;
1449         unsigned char *buf;
1450         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1451         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1452         sense_reason_t ret;
1453         u32 tpdl, tid_len = 0;
1454         int dest_local_nexus;
1455         u32 dest_rtpi = 0;
1456
1457         local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1458         /*
1459          * Allocate a struct pr_transport_id_holder and setup the
1460          * local_node_acl and local_se_deve pointers and add to
1461          * struct list_head tid_dest_list for add registration
1462          * processing in the loop of tid_dest_list below.
1463          */
1464         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1465         if (!tidh_new) {
1466                 pr_err("Unable to allocate tidh_new\n");
1467                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1468         }
1469         INIT_LIST_HEAD(&tidh_new->dest_list);
1470         tidh_new->dest_tpg = tpg;
1471         tidh_new->dest_node_acl = se_sess->se_node_acl;
1472         tidh_new->dest_se_deve = local_se_deve;
1473
1474         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1475                                 se_sess->se_node_acl, local_se_deve, l_isid,
1476                                 sa_res_key, all_tg_pt, aptpl);
1477         if (!local_pr_reg) {
1478                 kfree(tidh_new);
1479                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1480         }
1481         tidh_new->dest_pr_reg = local_pr_reg;
1482         /*
1483          * The local I_T nexus does not hold any configfs dependances,
1484          * so we set tid_h->dest_local_nexus=1 to prevent the
1485          * configfs_undepend_item() calls in the tid_dest_list loops below.
1486          */
1487         tidh_new->dest_local_nexus = 1;
1488         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1489
1490         if (cmd->data_length < 28) {
1491                 pr_warn("SPC-PR: Received PR OUT parameter list"
1492                         " length too small: %u\n", cmd->data_length);
1493                 ret = TCM_INVALID_PARAMETER_LIST;
1494                 goto out;
1495         }
1496
1497         buf = transport_kmap_data_sg(cmd);
1498         if (!buf) {
1499                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1500                 goto out;
1501         }
1502
1503         /*
1504          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1505          * first extract TransportID Parameter Data Length, and make sure
1506          * the value matches up to the SCSI expected data transfer length.
1507          */
1508         tpdl = (buf[24] & 0xff) << 24;
1509         tpdl |= (buf[25] & 0xff) << 16;
1510         tpdl |= (buf[26] & 0xff) << 8;
1511         tpdl |= buf[27] & 0xff;
1512
1513         if ((tpdl + 28) != cmd->data_length) {
1514                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1515                         " does not equal CDB data_length: %u\n", tpdl,
1516                         cmd->data_length);
1517                 ret = TCM_INVALID_PARAMETER_LIST;
1518                 goto out_unmap;
1519         }
1520         /*
1521          * Start processing the received transport IDs using the
1522          * receiving I_T Nexus portal's fabric dependent methods to
1523          * obtain the SCSI Initiator Port/Device Identifiers.
1524          */
1525         ptr = &buf[28];
1526
1527         while (tpdl > 0) {
1528                 proto_ident = (ptr[0] & 0x0f);
1529                 dest_tpg = NULL;
1530
1531                 spin_lock(&dev->se_port_lock);
1532                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1533                         tmp_tpg = tmp_port->sep_tpg;
1534                         if (!tmp_tpg)
1535                                 continue;
1536                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1537                         if (!tmp_tf_ops)
1538                                 continue;
1539                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1540                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1541                                 continue;
1542                         /*
1543                          * Look for the matching proto_ident provided by
1544                          * the received TransportID
1545                          */
1546                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1547                         if (tmp_proto_ident != proto_ident)
1548                                 continue;
1549                         dest_rtpi = tmp_port->sep_rtpi;
1550
1551                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1552                                         tmp_tpg, (const char *)ptr, &tid_len,
1553                                         &iport_ptr);
1554                         if (!i_str)
1555                                 continue;
1556
1557                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1558                         spin_unlock(&dev->se_port_lock);
1559
1560                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1561                                 pr_err(" core_scsi3_tpg_depend_item()"
1562                                         " for tmp_tpg\n");
1563                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1564                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1565                                 goto out_unmap;
1566                         }
1567                         /*
1568                          * Locate the destination initiator ACL to be registered
1569                          * from the decoded fabric module specific TransportID
1570                          * at *i_str.
1571                          */
1572                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1573                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1574                                                 tmp_tpg, i_str);
1575                         if (dest_node_acl)
1576                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1577                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1578
1579                         if (!dest_node_acl) {
1580                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1581                                 spin_lock(&dev->se_port_lock);
1582                                 continue;
1583                         }
1584
1585                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1586                                 pr_err("configfs_depend_item() failed"
1587                                         " for dest_node_acl->acl_group\n");
1588                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1589                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1590                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1591                                 goto out_unmap;
1592                         }
1593
1594                         dest_tpg = tmp_tpg;
1595                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1596                                 " %s Port RTPI: %hu\n",
1597                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1598                                 dest_node_acl->initiatorname, dest_rtpi);
1599
1600                         spin_lock(&dev->se_port_lock);
1601                         break;
1602                 }
1603                 spin_unlock(&dev->se_port_lock);
1604
1605                 if (!dest_tpg) {
1606                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1607                                         " dest_tpg\n");
1608                         ret = TCM_INVALID_PARAMETER_LIST;
1609                         goto out_unmap;
1610                 }
1611
1612                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1613                         " tid_len: %d for %s + %s\n",
1614                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1615                         tpdl, tid_len, i_str, iport_ptr);
1616
1617                 if (tid_len > tpdl) {
1618                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1619                                 " %u for Transport ID: %s\n", tid_len, ptr);
1620                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1621                         core_scsi3_tpg_undepend_item(dest_tpg);
1622                         ret = TCM_INVALID_PARAMETER_LIST;
1623                         goto out_unmap;
1624                 }
1625                 /*
1626                  * Locate the desintation struct se_dev_entry pointer for matching
1627                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1628                  * Target Port.
1629                  */
1630                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1631                                         dest_rtpi);
1632                 if (!dest_se_deve) {
1633                         pr_err("Unable to locate %s dest_se_deve"
1634                                 " from destination RTPI: %hu\n",
1635                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1636                                 dest_rtpi);
1637
1638                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1639                         core_scsi3_tpg_undepend_item(dest_tpg);
1640                         ret = TCM_INVALID_PARAMETER_LIST;
1641                         goto out_unmap;
1642                 }
1643
1644                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1645                         pr_err("core_scsi3_lunacl_depend_item()"
1646                                         " failed\n");
1647                         atomic_dec_mb(&dest_se_deve->pr_ref_count);
1648                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1649                         core_scsi3_tpg_undepend_item(dest_tpg);
1650                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1651                         goto out_unmap;
1652                 }
1653
1654                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1655                         " dest_se_deve mapped_lun: %u\n",
1656                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1657                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1658
1659                 /*
1660                  * Skip any TransportIDs that already have a registration for
1661                  * this target port.
1662                  */
1663                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1664                                         iport_ptr);
1665                 if (pr_reg_e) {
1666                         core_scsi3_put_pr_reg(pr_reg_e);
1667                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1668                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669                         core_scsi3_tpg_undepend_item(dest_tpg);
1670                         ptr += tid_len;
1671                         tpdl -= tid_len;
1672                         tid_len = 0;
1673                         continue;
1674                 }
1675                 /*
1676                  * Allocate a struct pr_transport_id_holder and setup
1677                  * the dest_node_acl and dest_se_deve pointers for the
1678                  * loop below.
1679                  */
1680                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1681                                 GFP_KERNEL);
1682                 if (!tidh_new) {
1683                         pr_err("Unable to allocate tidh_new\n");
1684                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1685                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1686                         core_scsi3_tpg_undepend_item(dest_tpg);
1687                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1688                         goto out_unmap;
1689                 }
1690                 INIT_LIST_HEAD(&tidh_new->dest_list);
1691                 tidh_new->dest_tpg = dest_tpg;
1692                 tidh_new->dest_node_acl = dest_node_acl;
1693                 tidh_new->dest_se_deve = dest_se_deve;
1694
1695                 /*
1696                  * Allocate, but do NOT add the registration for the
1697                  * TransportID referenced SCSI Initiator port.  This
1698                  * done because of the following from spc4r17 in section
1699                  * 6.14.3 wrt SPEC_I_PT:
1700                  *
1701                  * "If a registration fails for any initiator port (e.g., if th
1702                  * logical unit does not have enough resources available to
1703                  * hold the registration information), no registrations shall be
1704                  * made, and the command shall be terminated with
1705                  * CHECK CONDITION status."
1706                  *
1707                  * That means we call __core_scsi3_alloc_registration() here,
1708                  * and then call __core_scsi3_add_registration() in the
1709                  * 2nd loop which will never fail.
1710                  */
1711                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1712                                 dest_node_acl, dest_se_deve, iport_ptr,
1713                                 sa_res_key, all_tg_pt, aptpl);
1714                 if (!dest_pr_reg) {
1715                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1716                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1717                         core_scsi3_tpg_undepend_item(dest_tpg);
1718                         kfree(tidh_new);
1719                         ret = TCM_INVALID_PARAMETER_LIST;
1720                         goto out_unmap;
1721                 }
1722                 tidh_new->dest_pr_reg = dest_pr_reg;
1723                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1724
1725                 ptr += tid_len;
1726                 tpdl -= tid_len;
1727                 tid_len = 0;
1728
1729         }
1730
1731         transport_kunmap_data_sg(cmd);
1732
1733         /*
1734          * Go ahead and create a registrations from tid_dest_list for the
1735          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1736          * and dest_se_deve.
1737          *
1738          * The SA Reservation Key from the PROUT is set for the
1739          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1740          * means that the TransportID Initiator port will be
1741          * registered on all of the target ports in the SCSI target device
1742          * ALL_TG_PT=0 means the registration will only be for the
1743          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1744          * was received.
1745          */
1746         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1747                 dest_tpg = tidh->dest_tpg;
1748                 dest_node_acl = tidh->dest_node_acl;
1749                 dest_se_deve = tidh->dest_se_deve;
1750                 dest_pr_reg = tidh->dest_pr_reg;
1751                 dest_local_nexus = tidh->dest_local_nexus;
1752
1753                 list_del(&tidh->dest_list);
1754                 kfree(tidh);
1755
1756                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1757                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1758
1759                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1760                                         dest_pr_reg, 0, 0);
1761
1762                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1763                         " registered Transport ID for Node: %s%s Mapped LUN:"
1764                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1765                         dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
1766
1767                 if (dest_local_nexus)
1768                         continue;
1769
1770                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1771                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1772                 core_scsi3_tpg_undepend_item(dest_tpg);
1773         }
1774
1775         return 0;
1776 out_unmap:
1777         transport_kunmap_data_sg(cmd);
1778 out:
1779         /*
1780          * For the failure case, release everything from tid_dest_list
1781          * including *dest_pr_reg and the configfs dependances..
1782          */
1783         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1784                 dest_tpg = tidh->dest_tpg;
1785                 dest_node_acl = tidh->dest_node_acl;
1786                 dest_se_deve = tidh->dest_se_deve;
1787                 dest_pr_reg = tidh->dest_pr_reg;
1788                 dest_local_nexus = tidh->dest_local_nexus;
1789
1790                 list_del(&tidh->dest_list);
1791                 kfree(tidh);
1792                 /*
1793                  * Release any extra ALL_TG_PT=1 registrations for
1794                  * the SPEC_I_PT=1 case.
1795                  */
1796                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1797                                 &dest_pr_reg->pr_reg_atp_list,
1798                                 pr_reg_atp_mem_list) {
1799                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1800                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1801                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1802                 }
1803
1804                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1805
1806                 if (dest_local_nexus)
1807                         continue;
1808
1809                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1810                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1811                 core_scsi3_tpg_undepend_item(dest_tpg);
1812         }
1813         return ret;
1814 }
1815
1816 static int core_scsi3_update_aptpl_buf(
1817         struct se_device *dev,
1818         unsigned char *buf,
1819         u32 pr_aptpl_buf_len)
1820 {
1821         struct se_lun *lun;
1822         struct se_portal_group *tpg;
1823         struct t10_pr_registration *pr_reg;
1824         unsigned char tmp[512], isid_buf[32];
1825         ssize_t len = 0;
1826         int reg_count = 0;
1827         int ret = 0;
1828
1829         spin_lock(&dev->dev_reservation_lock);
1830         spin_lock(&dev->t10_pr.registration_lock);
1831         /*
1832          * Walk the registration list..
1833          */
1834         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1835                         pr_reg_list) {
1836
1837                 tmp[0] = '\0';
1838                 isid_buf[0] = '\0';
1839                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1840                 lun = pr_reg->pr_reg_tg_pt_lun;
1841                 /*
1842                  * Write out any ISID value to APTPL metadata that was included
1843                  * in the original registration.
1844                  */
1845                 if (pr_reg->isid_present_at_reg)
1846                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1847                                         pr_reg->pr_reg_isid);
1848                 /*
1849                  * Include special metadata if the pr_reg matches the
1850                  * reservation holder.
1851                  */
1852                 if (dev->dev_pr_res_holder == pr_reg) {
1853                         snprintf(tmp, 512, "PR_REG_START: %d"
1854                                 "\ninitiator_fabric=%s\n"
1855                                 "initiator_node=%s\n%s"
1856                                 "sa_res_key=%llu\n"
1857                                 "res_holder=1\nres_type=%02x\n"
1858                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1859                                 "mapped_lun=%u\n", reg_count,
1860                                 tpg->se_tpg_tfo->get_fabric_name(),
1861                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1862                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1863                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1864                                 pr_reg->pr_res_mapped_lun);
1865                 } else {
1866                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1867                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1868                                 "sa_res_key=%llu\nres_holder=0\n"
1869                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1870                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1871                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1872                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1873                                 pr_reg->pr_res_mapped_lun);
1874                 }
1875
1876                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1877                         pr_err("Unable to update renaming APTPL metadata,"
1878                                " reallocating larger buffer\n");
1879                         ret = -EMSGSIZE;
1880                         goto out;
1881                 }
1882                 len += sprintf(buf+len, "%s", tmp);
1883
1884                 /*
1885                  * Include information about the associated SCSI target port.
1886                  */
1887                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1888                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1889                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1890                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1891                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1892                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1893
1894                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1895                         pr_err("Unable to update renaming APTPL metadata,"
1896                                " reallocating larger buffer\n");
1897                         ret = -EMSGSIZE;
1898                         goto out;
1899                 }
1900                 len += sprintf(buf+len, "%s", tmp);
1901                 reg_count++;
1902         }
1903
1904         if (!reg_count)
1905                 len += sprintf(buf+len, "No Registrations or Reservations");
1906
1907 out:
1908         spin_unlock(&dev->t10_pr.registration_lock);
1909         spin_unlock(&dev->dev_reservation_lock);
1910
1911         return ret;
1912 }
1913
1914 static int __core_scsi3_write_aptpl_to_file(
1915         struct se_device *dev,
1916         unsigned char *buf)
1917 {
1918         struct t10_wwn *wwn = &dev->t10_wwn;
1919         struct file *file;
1920         int flags = O_RDWR | O_CREAT | O_TRUNC;
1921         char path[512];
1922         u32 pr_aptpl_buf_len;
1923         int ret;
1924
1925         memset(path, 0, 512);
1926
1927         if (strlen(&wwn->unit_serial[0]) >= 512) {
1928                 pr_err("WWN value for struct se_device does not fit"
1929                         " into path buffer\n");
1930                 return -EMSGSIZE;
1931         }
1932
1933         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1934         file = filp_open(path, flags, 0600);
1935         if (IS_ERR(file)) {
1936                 pr_err("filp_open(%s) for APTPL metadata"
1937                         " failed\n", path);
1938                 return PTR_ERR(file);
1939         }
1940
1941         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1942
1943         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1944
1945         if (ret < 0)
1946                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1947         fput(file);
1948
1949         return (ret < 0) ? -EIO : 0;
1950 }
1951
1952 /*
1953  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1954  * write out the updated metadata to struct file for this SCSI device.
1955  */
1956 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1957 {
1958         unsigned char *buf;
1959         int rc, len = PR_APTPL_BUF_LEN;
1960
1961         if (!aptpl) {
1962                 char *null_buf = "No Registrations or Reservations\n";
1963
1964                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
1965                 dev->t10_pr.pr_aptpl_active = 0;
1966                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
1967
1968                 if (rc)
1969                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1970
1971                 return 0;
1972         }
1973 retry:
1974         buf = vzalloc(len);
1975         if (!buf)
1976                 return TCM_OUT_OF_RESOURCES;
1977
1978         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
1979         if (rc < 0) {
1980                 vfree(buf);
1981                 len *= 2;
1982                 goto retry;
1983         }
1984
1985         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1986         if (rc != 0) {
1987                 pr_err("SPC-3 PR: Could not update APTPL\n");
1988                 vfree(buf);
1989                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1990         }
1991         dev->t10_pr.pr_aptpl_active = 1;
1992         vfree(buf);
1993         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1994         return 0;
1995 }
1996
1997 static sense_reason_t
1998 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
1999                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2000 {
2001         struct se_session *se_sess = cmd->se_sess;
2002         struct se_device *dev = cmd->se_dev;
2003         struct se_dev_entry *se_deve;
2004         struct se_lun *se_lun = cmd->se_lun;
2005         struct se_portal_group *se_tpg;
2006         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2007         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2008         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2009         sense_reason_t ret = TCM_NO_SENSE;
2010         int pr_holder = 0, type;
2011
2012         if (!se_sess || !se_lun) {
2013                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2014                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2015         }
2016         se_tpg = se_sess->se_tpg;
2017         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2018
2019         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2020                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2021                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2022                                 PR_REG_ISID_LEN);
2023                 isid_ptr = &isid_buf[0];
2024         }
2025         /*
2026          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2027          */
2028         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2029         if (!pr_reg) {
2030                 if (res_key) {
2031                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2032                                 " for SA REGISTER, returning CONFLICT\n");
2033                         return TCM_RESERVATION_CONFLICT;
2034                 }
2035                 /*
2036                  * Do nothing but return GOOD status.
2037                  */
2038                 if (!sa_res_key)
2039                         return 0;
2040
2041                 if (!spec_i_pt) {
2042                         /*
2043                          * Perform the Service Action REGISTER on the Initiator
2044                          * Port Endpoint that the PRO was received from on the
2045                          * Logical Unit of the SCSI device server.
2046                          */
2047                         if (core_scsi3_alloc_registration(cmd->se_dev,
2048                                         se_sess->se_node_acl, se_deve, isid_ptr,
2049                                         sa_res_key, all_tg_pt, aptpl,
2050                                         register_type, 0)) {
2051                                 pr_err("Unable to allocate"
2052                                         " struct t10_pr_registration\n");
2053                                 return TCM_INVALID_PARAMETER_LIST;
2054                         }
2055                 } else {
2056                         /*
2057                          * Register both the Initiator port that received
2058                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2059                          * TransportID from Parameter list and loop through
2060                          * fabric dependent parameter list while calling
2061                          * logic from of core_scsi3_alloc_registration() for
2062                          * each TransportID provided SCSI Initiator Port/Device
2063                          */
2064                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2065                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2066                         if (ret != 0)
2067                                 return ret;
2068                 }
2069
2070                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2071         }
2072
2073         /* ok, existing registration */
2074
2075         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2076                 pr_err("SPC-3 PR REGISTER: Received"
2077                        " res_key: 0x%016Lx does not match"
2078                        " existing SA REGISTER res_key:"
2079                        " 0x%016Lx\n", res_key,
2080                        pr_reg->pr_res_key);
2081                 ret = TCM_RESERVATION_CONFLICT;
2082                 goto out;
2083         }
2084
2085         if (spec_i_pt) {
2086                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2087                         " set on a registered nexus\n");
2088                 ret = TCM_INVALID_PARAMETER_LIST;
2089                 goto out;
2090         }
2091
2092         /*
2093          * An existing ALL_TG_PT=1 registration being released
2094          * must also set ALL_TG_PT=1 in the incoming PROUT.
2095          */
2096         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2097                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2098                         " registration exists, but ALL_TG_PT=1 bit not"
2099                         " present in received PROUT\n");
2100                 ret = TCM_INVALID_CDB_FIELD;
2101                 goto out;
2102         }
2103
2104         /*
2105          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2106          */
2107         if (sa_res_key) {
2108                 /*
2109                  * Increment PRgeneration counter for struct se_device"
2110                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2111                  * READ_KEYS service action.
2112                  */
2113                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2114                 pr_reg->pr_res_key = sa_res_key;
2115                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2116                          " Key for %s to: 0x%016Lx PRgeneration:"
2117                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2118                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2119                          pr_reg->pr_reg_nacl->initiatorname,
2120                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2121
2122         } else {
2123                 /*
2124                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2125                  */
2126                 type = pr_reg->pr_res_type;
2127                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2128                                                               pr_reg);
2129                 if (pr_holder < 0) {
2130                         ret = TCM_RESERVATION_CONFLICT;
2131                         goto out;
2132                 }
2133
2134                 spin_lock(&pr_tmpl->registration_lock);
2135                 /*
2136                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2137                  * and matching pr_res_key.
2138                  */
2139                 if (pr_reg->pr_reg_all_tg_pt) {
2140                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2141                                         &pr_tmpl->registration_list,
2142                                         pr_reg_list) {
2143
2144                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2145                                         continue;
2146                                 if (pr_reg_p->pr_res_key != res_key)
2147                                         continue;
2148                                 if (pr_reg == pr_reg_p)
2149                                         continue;
2150                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2151                                            pr_reg_p->pr_reg_nacl->initiatorname))
2152                                         continue;
2153
2154                                 __core_scsi3_free_registration(dev,
2155                                                 pr_reg_p, NULL, 0);
2156                         }
2157                 }
2158
2159                 /*
2160                  * Release the calling I_T Nexus registration now..
2161                  */
2162                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2163                 pr_reg = NULL;
2164
2165                 /*
2166                  * From spc4r17, section 5.7.11.3 Unregistering
2167                  *
2168                  * If the persistent reservation is a registrants only
2169                  * type, the device server shall establish a unit
2170                  * attention condition for the initiator port associated
2171                  * with every registered I_T nexus except for the I_T
2172                  * nexus on which the PERSISTENT RESERVE OUT command was
2173                  * received, with the additional sense code set to
2174                  * RESERVATIONS RELEASED.
2175                  */
2176                 if (pr_holder &&
2177                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2178                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2179                         list_for_each_entry(pr_reg_p,
2180                                         &pr_tmpl->registration_list,
2181                                         pr_reg_list) {
2182
2183                                 core_scsi3_ua_allocate(
2184                                         pr_reg_p->pr_reg_nacl,
2185                                         pr_reg_p->pr_res_mapped_lun,
2186                                         0x2A,
2187                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2188                         }
2189                 }
2190
2191                 spin_unlock(&pr_tmpl->registration_lock);
2192         }
2193
2194         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2195
2196 out:
2197         if (pr_reg)
2198                 core_scsi3_put_pr_reg(pr_reg);
2199         return ret;
2200 }
2201
2202 unsigned char *core_scsi3_pr_dump_type(int type)
2203 {
2204         switch (type) {
2205         case PR_TYPE_WRITE_EXCLUSIVE:
2206                 return "Write Exclusive Access";
2207         case PR_TYPE_EXCLUSIVE_ACCESS:
2208                 return "Exclusive Access";
2209         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2210                 return "Write Exclusive Access, Registrants Only";
2211         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2212                 return "Exclusive Access, Registrants Only";
2213         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2214                 return "Write Exclusive Access, All Registrants";
2215         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2216                 return "Exclusive Access, All Registrants";
2217         default:
2218                 break;
2219         }
2220
2221         return "Unknown SPC-3 PR Type";
2222 }
2223
2224 static sense_reason_t
2225 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2226 {
2227         struct se_device *dev = cmd->se_dev;
2228         struct se_session *se_sess = cmd->se_sess;
2229         struct se_lun *se_lun = cmd->se_lun;
2230         struct t10_pr_registration *pr_reg, *pr_res_holder;
2231         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2232         char i_buf[PR_REG_ISID_ID_LEN];
2233         sense_reason_t ret;
2234
2235         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2236
2237         if (!se_sess || !se_lun) {
2238                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2239                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2240         }
2241         /*
2242          * Locate the existing *pr_reg via struct se_node_acl pointers
2243          */
2244         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2245                                 se_sess);
2246         if (!pr_reg) {
2247                 pr_err("SPC-3 PR: Unable to locate"
2248                         " PR_REGISTERED *pr_reg for RESERVE\n");
2249                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2250         }
2251         /*
2252          * From spc4r17 Section 5.7.9: Reserving:
2253          *
2254          * An application client creates a persistent reservation by issuing
2255          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2256          * a registered I_T nexus with the following parameters:
2257          *    a) RESERVATION KEY set to the value of the reservation key that is
2258          *       registered with the logical unit for the I_T nexus; and
2259          */
2260         if (res_key != pr_reg->pr_res_key) {
2261                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2262                         " does not match existing SA REGISTER res_key:"
2263                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2264                 ret = TCM_RESERVATION_CONFLICT;
2265                 goto out_put_pr_reg;
2266         }
2267         /*
2268          * From spc4r17 Section 5.7.9: Reserving:
2269          *
2270          * From above:
2271          *  b) TYPE field and SCOPE field set to the persistent reservation
2272          *     being created.
2273          *
2274          * Only one persistent reservation is allowed at a time per logical unit
2275          * and that persistent reservation has a scope of LU_SCOPE.
2276          */
2277         if (scope != PR_SCOPE_LU_SCOPE) {
2278                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2279                 ret = TCM_INVALID_PARAMETER_LIST;
2280                 goto out_put_pr_reg;
2281         }
2282         /*
2283          * See if we have an existing PR reservation holder pointer at
2284          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2285          * *pr_res_holder.
2286          */
2287         spin_lock(&dev->dev_reservation_lock);
2288         pr_res_holder = dev->dev_pr_res_holder;
2289         if (pr_res_holder) {
2290                 int pr_res_type = pr_res_holder->pr_res_type;
2291                 /*
2292                  * From spc4r17 Section 5.7.9: Reserving:
2293                  *
2294                  * If the device server receives a PERSISTENT RESERVE OUT
2295                  * command from an I_T nexus other than a persistent reservation
2296                  * holder (see 5.7.10) that attempts to create a persistent
2297                  * reservation when a persistent reservation already exists for
2298                  * the logical unit, then the command shall be completed with
2299                  * RESERVATION CONFLICT status.
2300                  */
2301                 if ((pr_res_holder != pr_reg) &&
2302                     (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2303                     (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2304                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2305                         pr_err("SPC-3 PR: Attempted RESERVE from"
2306                                 " [%s]: %s while reservation already held by"
2307                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2308                                 cmd->se_tfo->get_fabric_name(),
2309                                 se_sess->se_node_acl->initiatorname,
2310                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2311                                 pr_res_holder->pr_reg_nacl->initiatorname);
2312
2313                         spin_unlock(&dev->dev_reservation_lock);
2314                         ret = TCM_RESERVATION_CONFLICT;
2315                         goto out_put_pr_reg;
2316                 }
2317                 /*
2318                  * From spc4r17 Section 5.7.9: Reserving:
2319                  *
2320                  * If a persistent reservation holder attempts to modify the
2321                  * type or scope of an existing persistent reservation, the
2322                  * command shall be completed with RESERVATION CONFLICT status.
2323                  */
2324                 if ((pr_res_holder->pr_res_type != type) ||
2325                     (pr_res_holder->pr_res_scope != scope)) {
2326                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2327                         pr_err("SPC-3 PR: Attempted RESERVE from"
2328                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2329                                 " while reservation already held by [%s]: %s,"
2330                                 " returning RESERVATION_CONFLICT\n",
2331                                 cmd->se_tfo->get_fabric_name(),
2332                                 se_sess->se_node_acl->initiatorname,
2333                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2334                                 pr_res_holder->pr_reg_nacl->initiatorname);
2335
2336                         spin_unlock(&dev->dev_reservation_lock);
2337                         ret = TCM_RESERVATION_CONFLICT;
2338                         goto out_put_pr_reg;
2339                 }
2340                 /*
2341                  * From spc4r17 Section 5.7.9: Reserving:
2342                  *
2343                  * If the device server receives a PERSISTENT RESERVE OUT
2344                  * command with RESERVE service action where the TYPE field and
2345                  * the SCOPE field contain the same values as the existing type
2346                  * and scope from a persistent reservation holder, it shall not
2347                  * make any change to the existing persistent reservation and
2348                  * shall completethe command with GOOD status.
2349                  */
2350                 spin_unlock(&dev->dev_reservation_lock);
2351                 ret = 0;
2352                 goto out_put_pr_reg;
2353         }
2354         /*
2355          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2356          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2357          */
2358         pr_reg->pr_res_scope = scope;
2359         pr_reg->pr_res_type = type;
2360         pr_reg->pr_res_holder = 1;
2361         dev->dev_pr_res_holder = pr_reg;
2362         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2363
2364         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2365                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2366                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2367                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2368         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2369                         cmd->se_tfo->get_fabric_name(),
2370                         se_sess->se_node_acl->initiatorname,
2371                         i_buf);
2372         spin_unlock(&dev->dev_reservation_lock);
2373
2374         if (pr_tmpl->pr_aptpl_active)
2375                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2376
2377         ret = 0;
2378 out_put_pr_reg:
2379         core_scsi3_put_pr_reg(pr_reg);
2380         return ret;
2381 }
2382
2383 static sense_reason_t
2384 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2385                 u64 res_key)
2386 {
2387         switch (type) {
2388         case PR_TYPE_WRITE_EXCLUSIVE:
2389         case PR_TYPE_EXCLUSIVE_ACCESS:
2390         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2391         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2392         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2393         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2394                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2395         default:
2396                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2397                         " 0x%02x\n", type);
2398                 return TCM_INVALID_CDB_FIELD;
2399         }
2400 }
2401
2402 /*
2403  * Called with struct se_device->dev_reservation_lock held.
2404  */
2405 static void __core_scsi3_complete_pro_release(
2406         struct se_device *dev,
2407         struct se_node_acl *se_nacl,
2408         struct t10_pr_registration *pr_reg,
2409         int explicit,
2410         int unreg)
2411 {
2412         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2413         char i_buf[PR_REG_ISID_ID_LEN];
2414         int pr_res_type = 0, pr_res_scope = 0;
2415
2416         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2417         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2418         /*
2419          * Go ahead and release the current PR reservation holder.
2420          * If an All Registrants reservation is currently active and
2421          * a unregister operation is requested, replace the current
2422          * dev_pr_res_holder with another active registration.
2423          */
2424         if (dev->dev_pr_res_holder) {
2425                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2426                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2427                 dev->dev_pr_res_holder->pr_res_type = 0;
2428                 dev->dev_pr_res_holder->pr_res_scope = 0;
2429                 dev->dev_pr_res_holder->pr_res_holder = 0;
2430                 dev->dev_pr_res_holder = NULL;
2431         }
2432         if (!unreg)
2433                 goto out;
2434
2435         spin_lock(&dev->t10_pr.registration_lock);
2436         list_del_init(&pr_reg->pr_reg_list);
2437         /*
2438          * If the I_T nexus is a reservation holder, the persistent reservation
2439          * is of an all registrants type, and the I_T nexus is the last remaining
2440          * registered I_T nexus, then the device server shall also release the
2441          * persistent reservation.
2442          */
2443         if (!list_empty(&dev->t10_pr.registration_list) &&
2444             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2445              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2446                 dev->dev_pr_res_holder =
2447                         list_entry(dev->t10_pr.registration_list.next,
2448                                    struct t10_pr_registration, pr_reg_list);
2449                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2450                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2451                 dev->dev_pr_res_holder->pr_res_holder = 1;
2452         }
2453         spin_unlock(&dev->t10_pr.registration_lock);
2454 out:
2455         if (!dev->dev_pr_res_holder) {
2456                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2457                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2458                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2459                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2460                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2461         }
2462         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2463                 tfo->get_fabric_name(), se_nacl->initiatorname,
2464                 i_buf);
2465         /*
2466          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2467          */
2468         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2469 }
2470
2471 static sense_reason_t
2472 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2473                 u64 res_key)
2474 {
2475         struct se_device *dev = cmd->se_dev;
2476         struct se_session *se_sess = cmd->se_sess;
2477         struct se_lun *se_lun = cmd->se_lun;
2478         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2479         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2480         int all_reg = 0;
2481         sense_reason_t ret = 0;
2482
2483         if (!se_sess || !se_lun) {
2484                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2485                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2486         }
2487         /*
2488          * Locate the existing *pr_reg via struct se_node_acl pointers
2489          */
2490         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2491         if (!pr_reg) {
2492                 pr_err("SPC-3 PR: Unable to locate"
2493                         " PR_REGISTERED *pr_reg for RELEASE\n");
2494                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2495         }
2496         /*
2497          * From spc4r17 Section 5.7.11.2 Releasing:
2498          *
2499          * If there is no persistent reservation or in response to a persistent
2500          * reservation release request from a registered I_T nexus that is not a
2501          * persistent reservation holder (see 5.7.10), the device server shall
2502          * do the following:
2503          *
2504          *     a) Not release the persistent reservation, if any;
2505          *     b) Not remove any registrations; and
2506          *     c) Complete the command with GOOD status.
2507          */
2508         spin_lock(&dev->dev_reservation_lock);
2509         pr_res_holder = dev->dev_pr_res_holder;
2510         if (!pr_res_holder) {
2511                 /*
2512                  * No persistent reservation, return GOOD status.
2513                  */
2514                 spin_unlock(&dev->dev_reservation_lock);
2515                 goto out_put_pr_reg;
2516         }
2517         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2518             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2519                 all_reg = 1;
2520
2521         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2522                 /*
2523                  * Non 'All Registrants' PR Type cases..
2524                  * Release request from a registered I_T nexus that is not a
2525                  * persistent reservation holder. return GOOD status.
2526                  */
2527                 spin_unlock(&dev->dev_reservation_lock);
2528                 goto out_put_pr_reg;
2529         }
2530
2531         /*
2532          * From spc4r17 Section 5.7.11.2 Releasing:
2533          *
2534          * Only the persistent reservation holder (see 5.7.10) is allowed to
2535          * release a persistent reservation.
2536          *
2537          * An application client releases the persistent reservation by issuing
2538          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2539          * an I_T nexus that is a persistent reservation holder with the
2540          * following parameters:
2541          *
2542          *     a) RESERVATION KEY field set to the value of the reservation key
2543          *        that is registered with the logical unit for the I_T nexus;
2544          */
2545         if (res_key != pr_reg->pr_res_key) {
2546                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2547                         " does not match existing SA REGISTER res_key:"
2548                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2549                 spin_unlock(&dev->dev_reservation_lock);
2550                 ret = TCM_RESERVATION_CONFLICT;
2551                 goto out_put_pr_reg;
2552         }
2553         /*
2554          * From spc4r17 Section 5.7.11.2 Releasing and above:
2555          *
2556          * b) TYPE field and SCOPE field set to match the persistent
2557          *    reservation being released.
2558          */
2559         if ((pr_res_holder->pr_res_type != type) ||
2560             (pr_res_holder->pr_res_scope != scope)) {
2561                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2562                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2563                         " reservation from [%s]: %s with different TYPE "
2564                         "and/or SCOPE  while reservation already held by"
2565                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2566                         cmd->se_tfo->get_fabric_name(),
2567                         se_sess->se_node_acl->initiatorname,
2568                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2569                         pr_res_holder->pr_reg_nacl->initiatorname);
2570
2571                 spin_unlock(&dev->dev_reservation_lock);
2572                 ret = TCM_RESERVATION_CONFLICT;
2573                 goto out_put_pr_reg;
2574         }
2575         /*
2576          * In response to a persistent reservation release request from the
2577          * persistent reservation holder the device server shall perform a
2578          * release by doing the following as an uninterrupted series of actions:
2579          * a) Release the persistent reservation;
2580          * b) Not remove any registration(s);
2581          * c) If the released persistent reservation is a registrants only type
2582          * or all registrants type persistent reservation,
2583          *    the device server shall establish a unit attention condition for
2584          *    the initiator port associated with every regis-
2585          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2586          *    RESERVE OUT command with RELEASE service action was received,
2587          *    with the additional sense code set to RESERVATIONS RELEASED; and
2588          * d) If the persistent reservation is of any other type, the device
2589          *    server shall not establish a unit attention condition.
2590          */
2591         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2592                                           pr_reg, 1, 0);
2593
2594         spin_unlock(&dev->dev_reservation_lock);
2595
2596         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2597             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2598             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2599             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2600                 /*
2601                  * If no UNIT ATTENTION conditions will be established for
2602                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2603                  * go ahead and check for APTPL=1 update+write below
2604                  */
2605                 goto write_aptpl;
2606         }
2607
2608         spin_lock(&pr_tmpl->registration_lock);
2609         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2610                         pr_reg_list) {
2611                 /*
2612                  * Do not establish a UNIT ATTENTION condition
2613                  * for the calling I_T Nexus
2614                  */
2615                 if (pr_reg_p == pr_reg)
2616                         continue;
2617
2618                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2619                                 pr_reg_p->pr_res_mapped_lun,
2620                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2621         }
2622         spin_unlock(&pr_tmpl->registration_lock);
2623
2624 write_aptpl:
2625         if (pr_tmpl->pr_aptpl_active)
2626                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2627
2628 out_put_pr_reg:
2629         core_scsi3_put_pr_reg(pr_reg);
2630         return ret;
2631 }
2632
2633 static sense_reason_t
2634 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2635 {
2636         struct se_device *dev = cmd->se_dev;
2637         struct se_node_acl *pr_reg_nacl;
2638         struct se_session *se_sess = cmd->se_sess;
2639         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2640         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2641         u32 pr_res_mapped_lun = 0;
2642         int calling_it_nexus = 0;
2643         /*
2644          * Locate the existing *pr_reg via struct se_node_acl pointers
2645          */
2646         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2647                         se_sess->se_node_acl, se_sess);
2648         if (!pr_reg_n) {
2649                 pr_err("SPC-3 PR: Unable to locate"
2650                         " PR_REGISTERED *pr_reg for CLEAR\n");
2651                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2652         }
2653         /*
2654          * From spc4r17 section 5.7.11.6, Clearing:
2655          *
2656          * Any application client may release the persistent reservation and
2657          * remove all registrations from a device server by issuing a
2658          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2659          * registered I_T nexus with the following parameter:
2660          *
2661          *      a) RESERVATION KEY field set to the value of the reservation key
2662          *         that is registered with the logical unit for the I_T nexus.
2663          */
2664         if (res_key != pr_reg_n->pr_res_key) {
2665                 pr_err("SPC-3 PR REGISTER: Received"
2666                         " res_key: 0x%016Lx does not match"
2667                         " existing SA REGISTER res_key:"
2668                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2669                 core_scsi3_put_pr_reg(pr_reg_n);
2670                 return TCM_RESERVATION_CONFLICT;
2671         }
2672         /*
2673          * a) Release the persistent reservation, if any;
2674          */
2675         spin_lock(&dev->dev_reservation_lock);
2676         pr_res_holder = dev->dev_pr_res_holder;
2677         if (pr_res_holder) {
2678                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2679                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2680                                                   pr_res_holder, 0, 0);
2681         }
2682         spin_unlock(&dev->dev_reservation_lock);
2683         /*
2684          * b) Remove all registration(s) (see spc4r17 5.7.7);
2685          */
2686         spin_lock(&pr_tmpl->registration_lock);
2687         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2688                         &pr_tmpl->registration_list, pr_reg_list) {
2689
2690                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2691                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2692                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2693                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2694                                         calling_it_nexus);
2695                 /*
2696                  * e) Establish a unit attention condition for the initiator
2697                  *    port associated with every registered I_T nexus other
2698                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2699                  *    command with CLEAR service action was received, with the
2700                  *    additional sense code set to RESERVATIONS PREEMPTED.
2701                  */
2702                 if (!calling_it_nexus)
2703                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2704                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2705         }
2706         spin_unlock(&pr_tmpl->registration_lock);
2707
2708         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2709                 cmd->se_tfo->get_fabric_name());
2710
2711         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2712
2713         core_scsi3_pr_generation(dev);
2714         return 0;
2715 }
2716
2717 /*
2718  * Called with struct se_device->dev_reservation_lock held.
2719  */
2720 static void __core_scsi3_complete_pro_preempt(
2721         struct se_device *dev,
2722         struct t10_pr_registration *pr_reg,
2723         struct list_head *preempt_and_abort_list,
2724         int type,
2725         int scope,
2726         enum preempt_type preempt_type)
2727 {
2728         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2729         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2730         char i_buf[PR_REG_ISID_ID_LEN];
2731
2732         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2733         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2734         /*
2735          * Do an implicit RELEASE of the existing reservation.
2736          */
2737         if (dev->dev_pr_res_holder)
2738                 __core_scsi3_complete_pro_release(dev, nacl,
2739                                                   dev->dev_pr_res_holder, 0, 0);
2740
2741         dev->dev_pr_res_holder = pr_reg;
2742         pr_reg->pr_res_holder = 1;
2743         pr_reg->pr_res_type = type;
2744         pr_reg->pr_res_scope = scope;
2745
2746         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2747                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2748                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2749                 core_scsi3_pr_dump_type(type),
2750                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2751         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2752                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2753                 nacl->initiatorname, i_buf);
2754         /*
2755          * For PREEMPT_AND_ABORT, add the preempting reservation's
2756          * struct t10_pr_registration to the list that will be compared
2757          * against received CDBs..
2758          */
2759         if (preempt_and_abort_list)
2760                 list_add_tail(&pr_reg->pr_reg_abort_list,
2761                                 preempt_and_abort_list);
2762 }
2763
2764 static void core_scsi3_release_preempt_and_abort(
2765         struct list_head *preempt_and_abort_list,
2766         struct t10_pr_registration *pr_reg_holder)
2767 {
2768         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2769
2770         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2771                                 pr_reg_abort_list) {
2772
2773                 list_del(&pr_reg->pr_reg_abort_list);
2774                 if (pr_reg_holder == pr_reg)
2775                         continue;
2776                 if (pr_reg->pr_res_holder) {
2777                         pr_warn("pr_reg->pr_res_holder still set\n");
2778                         continue;
2779                 }
2780
2781                 pr_reg->pr_reg_deve = NULL;
2782                 pr_reg->pr_reg_nacl = NULL;
2783                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2784         }
2785 }
2786
2787 static sense_reason_t
2788 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2789                 u64 sa_res_key, enum preempt_type preempt_type)
2790 {
2791         struct se_device *dev = cmd->se_dev;
2792         struct se_node_acl *pr_reg_nacl;
2793         struct se_session *se_sess = cmd->se_sess;
2794         LIST_HEAD(preempt_and_abort_list);
2795         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2796         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2797         u32 pr_res_mapped_lun = 0;
2798         int all_reg = 0, calling_it_nexus = 0;
2799         bool sa_res_key_unmatched = sa_res_key != 0;
2800         int prh_type = 0, prh_scope = 0;
2801
2802         if (!se_sess)
2803                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2804
2805         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2806                                 se_sess);
2807         if (!pr_reg_n) {
2808                 pr_err("SPC-3 PR: Unable to locate"
2809                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2810                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2811                 return TCM_RESERVATION_CONFLICT;
2812         }
2813         if (pr_reg_n->pr_res_key != res_key) {
2814                 core_scsi3_put_pr_reg(pr_reg_n);
2815                 return TCM_RESERVATION_CONFLICT;
2816         }
2817         if (scope != PR_SCOPE_LU_SCOPE) {
2818                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2819                 core_scsi3_put_pr_reg(pr_reg_n);
2820                 return TCM_INVALID_PARAMETER_LIST;
2821         }
2822
2823         spin_lock(&dev->dev_reservation_lock);
2824         pr_res_holder = dev->dev_pr_res_holder;
2825         if (pr_res_holder &&
2826            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2827             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2828                 all_reg = 1;
2829
2830         if (!all_reg && !sa_res_key) {
2831                 spin_unlock(&dev->dev_reservation_lock);
2832                 core_scsi3_put_pr_reg(pr_reg_n);
2833                 return TCM_INVALID_PARAMETER_LIST;
2834         }
2835         /*
2836          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2837          *
2838          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2839          * persistent reservation holder or there is no persistent reservation
2840          * holder (i.e., there is no persistent reservation), then the device
2841          * server shall perform a preempt by doing the following in an
2842          * uninterrupted series of actions. (See below..)
2843          */
2844         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2845                 /*
2846                  * No existing or SA Reservation Key matching reservations..
2847                  *
2848                  * PROUT SA PREEMPT with All Registrant type reservations are
2849                  * allowed to be processed without a matching SA Reservation Key
2850                  */
2851                 spin_lock(&pr_tmpl->registration_lock);
2852                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2853                                 &pr_tmpl->registration_list, pr_reg_list) {
2854                         /*
2855                          * Removing of registrations in non all registrants
2856                          * type reservations without a matching SA reservation
2857                          * key.
2858                          *
2859                          * a) Remove the registrations for all I_T nexuses
2860                          *    specified by the SERVICE ACTION RESERVATION KEY
2861                          *    field;
2862                          * b) Ignore the contents of the SCOPE and TYPE fields;
2863                          * c) Process tasks as defined in 5.7.1; and
2864                          * d) Establish a unit attention condition for the
2865                          *    initiator port associated with every I_T nexus
2866                          *    that lost its registration other than the I_T
2867                          *    nexus on which the PERSISTENT RESERVE OUT command
2868                          *    was received, with the additional sense code set
2869                          *    to REGISTRATIONS PREEMPTED.
2870                          */
2871                         if (!all_reg) {
2872                                 if (pr_reg->pr_res_key != sa_res_key)
2873                                         continue;
2874                                 sa_res_key_unmatched = false;
2875
2876                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2877                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2878                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2879                                 __core_scsi3_free_registration(dev, pr_reg,
2880                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2881                                                 NULL, calling_it_nexus);
2882                         } else {
2883                                 /*
2884                                  * Case for any existing all registrants type
2885                                  * reservation, follow logic in spc4r17 section
2886                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2887                                  *
2888                                  * For a ZERO SA Reservation key, release
2889                                  * all other registrations and do an implicit
2890                                  * release of active persistent reservation.
2891                                  *
2892                                  * For a non-ZERO SA Reservation key, only
2893                                  * release the matching reservation key from
2894                                  * registrations.
2895                                  */
2896                                 if ((sa_res_key) &&
2897                                      (pr_reg->pr_res_key != sa_res_key))
2898                                         continue;
2899                                 sa_res_key_unmatched = false;
2900
2901                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2902                                 if (calling_it_nexus)
2903                                         continue;
2904
2905                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2906                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2907                                 __core_scsi3_free_registration(dev, pr_reg,
2908                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2909                                                 NULL, 0);
2910                         }
2911                         if (!calling_it_nexus)
2912                                 core_scsi3_ua_allocate(pr_reg_nacl,
2913                                         pr_res_mapped_lun, 0x2A,
2914                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2915                 }
2916                 spin_unlock(&pr_tmpl->registration_lock);
2917                 /*
2918                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2919                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2920                  * RESERVATION KEY field to a value that does not match any
2921                  * registered reservation key, then the device server shall
2922                  * complete the command with RESERVATION CONFLICT status.
2923                  */
2924                 if (sa_res_key_unmatched) {
2925                         spin_unlock(&dev->dev_reservation_lock);
2926                         core_scsi3_put_pr_reg(pr_reg_n);
2927                         return TCM_RESERVATION_CONFLICT;
2928                 }
2929                 /*
2930                  * For an existing all registrants type reservation
2931                  * with a zero SA rservation key, preempt the existing
2932                  * reservation with the new PR type and scope.
2933                  */
2934                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2935                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2936                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2937                                 type, scope, preempt_type);
2938
2939                         if (preempt_type == PREEMPT_AND_ABORT)
2940                                 core_scsi3_release_preempt_and_abort(
2941                                         &preempt_and_abort_list, pr_reg_n);
2942                 }
2943                 spin_unlock(&dev->dev_reservation_lock);
2944
2945                 if (pr_tmpl->pr_aptpl_active)
2946                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2947
2948                 core_scsi3_put_pr_reg(pr_reg_n);
2949                 core_scsi3_pr_generation(cmd->se_dev);
2950                 return 0;
2951         }
2952         /*
2953          * The PREEMPTing SA reservation key matches that of the
2954          * existing persistent reservation, first, we check if
2955          * we are preempting our own reservation.
2956          * From spc4r17, section 5.7.11.4.3 Preempting
2957          * persistent reservations and registration handling
2958          *
2959          * If an all registrants persistent reservation is not
2960          * present, it is not an error for the persistent
2961          * reservation holder to preempt itself (i.e., a
2962          * PERSISTENT RESERVE OUT with a PREEMPT service action
2963          * or a PREEMPT AND ABORT service action with the
2964          * SERVICE ACTION RESERVATION KEY value equal to the
2965          * persistent reservation holder's reservation key that
2966          * is received from the persistent reservation holder).
2967          * In that case, the device server shall establish the
2968          * new persistent reservation and maintain the
2969          * registration.
2970          */
2971         prh_type = pr_res_holder->pr_res_type;
2972         prh_scope = pr_res_holder->pr_res_scope;
2973         /*
2974          * If the SERVICE ACTION RESERVATION KEY field identifies a
2975          * persistent reservation holder (see 5.7.10), the device
2976          * server shall perform a preempt by doing the following as
2977          * an uninterrupted series of actions:
2978          *
2979          * a) Release the persistent reservation for the holder
2980          *    identified by the SERVICE ACTION RESERVATION KEY field;
2981          */
2982         if (pr_reg_n != pr_res_holder)
2983                 __core_scsi3_complete_pro_release(dev,
2984                                                   pr_res_holder->pr_reg_nacl,
2985                                                   dev->dev_pr_res_holder, 0, 0);
2986         /*
2987          * b) Remove the registrations for all I_T nexuses identified
2988          *    by the SERVICE ACTION RESERVATION KEY field, except the
2989          *    I_T nexus that is being used for the PERSISTENT RESERVE
2990          *    OUT command. If an all registrants persistent reservation
2991          *    is present and the SERVICE ACTION RESERVATION KEY field
2992          *    is set to zero, then all registrations shall be removed
2993          *    except for that of the I_T nexus that is being used for
2994          *    the PERSISTENT RESERVE OUT command;
2995          */
2996         spin_lock(&pr_tmpl->registration_lock);
2997         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2998                         &pr_tmpl->registration_list, pr_reg_list) {
2999
3000                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3001                 if (calling_it_nexus)
3002                         continue;
3003
3004                 if (pr_reg->pr_res_key != sa_res_key)
3005                         continue;
3006
3007                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3008                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3009                 __core_scsi3_free_registration(dev, pr_reg,
3010                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3011                                 calling_it_nexus);
3012                 /*
3013                  * e) Establish a unit attention condition for the initiator
3014                  *    port associated with every I_T nexus that lost its
3015                  *    persistent reservation and/or registration, with the
3016                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3017                  */
3018                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3019                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3020         }
3021         spin_unlock(&pr_tmpl->registration_lock);
3022         /*
3023          * c) Establish a persistent reservation for the preempting
3024          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3025          */
3026         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3027                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3028                         type, scope, preempt_type);
3029         /*
3030          * d) Process tasks as defined in 5.7.1;
3031          * e) See above..
3032          * f) If the type or scope has changed, then for every I_T nexus
3033          *    whose reservation key was not removed, except for the I_T
3034          *    nexus on which the PERSISTENT RESERVE OUT command was
3035          *    received, the device server shall establish a unit
3036          *    attention condition for the initiator port associated with
3037          *    that I_T nexus, with the additional sense code set to
3038          *    RESERVATIONS RELEASED. If the type or scope have not
3039          *    changed, then no unit attention condition(s) shall be
3040          *    established for this reason.
3041          */
3042         if ((prh_type != type) || (prh_scope != scope)) {
3043                 spin_lock(&pr_tmpl->registration_lock);
3044                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3045                                 &pr_tmpl->registration_list, pr_reg_list) {
3046
3047                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3048                         if (calling_it_nexus)
3049                                 continue;
3050
3051                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3052                                         pr_reg->pr_res_mapped_lun, 0x2A,
3053                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3054                 }
3055                 spin_unlock(&pr_tmpl->registration_lock);
3056         }
3057         spin_unlock(&dev->dev_reservation_lock);
3058         /*
3059          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3060          * All received CDBs for the matching existing reservation and
3061          * registrations undergo ABORT_TASK logic.
3062          *
3063          * From there, core_scsi3_release_preempt_and_abort() will
3064          * release every registration in the list (which have already
3065          * been removed from the primary pr_reg list), except the
3066          * new persistent reservation holder, the calling Initiator Port.
3067          */
3068         if (preempt_type == PREEMPT_AND_ABORT) {
3069                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3070                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3071                                                 pr_reg_n);
3072         }
3073
3074         if (pr_tmpl->pr_aptpl_active)
3075                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3076
3077         core_scsi3_put_pr_reg(pr_reg_n);
3078         core_scsi3_pr_generation(cmd->se_dev);
3079         return 0;
3080 }
3081
3082 static sense_reason_t
3083 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3084                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3085 {
3086         switch (type) {
3087         case PR_TYPE_WRITE_EXCLUSIVE:
3088         case PR_TYPE_EXCLUSIVE_ACCESS:
3089         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3090         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3091         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3092         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3093                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3094                                               sa_res_key, preempt_type);
3095         default:
3096                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3097                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3098                 return TCM_INVALID_CDB_FIELD;
3099         }
3100 }
3101
3102
3103 static sense_reason_t
3104 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3105                 u64 sa_res_key, int aptpl, int unreg)
3106 {
3107         struct se_session *se_sess = cmd->se_sess;
3108         struct se_device *dev = cmd->se_dev;
3109         struct se_dev_entry *dest_se_deve = NULL;
3110         struct se_lun *se_lun = cmd->se_lun;
3111         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3112         struct se_port *se_port;
3113         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3114         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3115         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3116         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3117         unsigned char *buf;
3118         unsigned char *initiator_str;
3119         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3120         u32 tid_len, tmp_tid_len;
3121         int new_reg = 0, type, scope, matching_iname;
3122         sense_reason_t ret;
3123         unsigned short rtpi;
3124         unsigned char proto_ident;
3125
3126         if (!se_sess || !se_lun) {
3127                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3128                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3129         }
3130
3131         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3132         se_tpg = se_sess->se_tpg;
3133         tf_ops = se_tpg->se_tpg_tfo;
3134         /*
3135          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3136          *      Register behaviors for a REGISTER AND MOVE service action
3137          *
3138          * Locate the existing *pr_reg via struct se_node_acl pointers
3139          */
3140         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3141                                 se_sess);
3142         if (!pr_reg) {
3143                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3144                         " *pr_reg for REGISTER_AND_MOVE\n");
3145                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3146         }
3147         /*
3148          * The provided reservation key much match the existing reservation key
3149          * provided during this initiator's I_T nexus registration.
3150          */
3151         if (res_key != pr_reg->pr_res_key) {
3152                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3153                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3154                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3155                 ret = TCM_RESERVATION_CONFLICT;
3156                 goto out_put_pr_reg;
3157         }
3158         /*
3159          * The service active reservation key needs to be non zero
3160          */
3161         if (!sa_res_key) {
3162                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3163                         " sa_res_key\n");
3164                 ret = TCM_INVALID_PARAMETER_LIST;
3165                 goto out_put_pr_reg;
3166         }
3167
3168         /*
3169          * Determine the Relative Target Port Identifier where the reservation
3170          * will be moved to for the TransportID containing SCSI initiator WWN
3171          * information.
3172          */
3173         buf = transport_kmap_data_sg(cmd);
3174         if (!buf) {
3175                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3176                 goto out_put_pr_reg;
3177         }
3178
3179         rtpi = (buf[18] & 0xff) << 8;
3180         rtpi |= buf[19] & 0xff;
3181         tid_len = (buf[20] & 0xff) << 24;
3182         tid_len |= (buf[21] & 0xff) << 16;
3183         tid_len |= (buf[22] & 0xff) << 8;
3184         tid_len |= buf[23] & 0xff;
3185         transport_kunmap_data_sg(cmd);
3186         buf = NULL;
3187
3188         if ((tid_len + 24) != cmd->data_length) {
3189                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3190                         " does not equal CDB data_length: %u\n", tid_len,
3191                         cmd->data_length);
3192                 ret = TCM_INVALID_PARAMETER_LIST;
3193                 goto out_put_pr_reg;
3194         }
3195
3196         spin_lock(&dev->se_port_lock);
3197         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3198                 if (se_port->sep_rtpi != rtpi)
3199                         continue;
3200                 dest_se_tpg = se_port->sep_tpg;
3201                 if (!dest_se_tpg)
3202                         continue;
3203                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3204                 if (!dest_tf_ops)
3205                         continue;
3206
3207                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3208                 spin_unlock(&dev->se_port_lock);
3209
3210                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3211                         pr_err("core_scsi3_tpg_depend_item() failed"
3212                                 " for dest_se_tpg\n");
3213                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3214                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3215                         goto out_put_pr_reg;
3216                 }
3217
3218                 spin_lock(&dev->se_port_lock);
3219                 break;
3220         }
3221         spin_unlock(&dev->se_port_lock);
3222
3223         if (!dest_se_tpg || !dest_tf_ops) {
3224                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3225                         " fabric ops from Relative Target Port Identifier:"
3226                         " %hu\n", rtpi);
3227                 ret = TCM_INVALID_PARAMETER_LIST;
3228                 goto out_put_pr_reg;
3229         }
3230
3231         buf = transport_kmap_data_sg(cmd);
3232         if (!buf) {
3233                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3234                 goto out_put_pr_reg;
3235         }
3236         proto_ident = (buf[24] & 0x0f);
3237
3238         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3239                         " 0x%02x\n", proto_ident);
3240
3241         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3242                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3243                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3244                         " from fabric: %s\n", proto_ident,
3245                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3246                         dest_tf_ops->get_fabric_name());
3247                 ret = TCM_INVALID_PARAMETER_LIST;
3248                 goto out;
3249         }
3250         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3251                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3252                         " containg a valid tpg_parse_pr_out_transport_id"
3253                         " function pointer\n");
3254                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3255                 goto out;
3256         }
3257         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3258                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3259         if (!initiator_str) {
3260                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3261                         " initiator_str from Transport ID\n");
3262                 ret = TCM_INVALID_PARAMETER_LIST;
3263                 goto out;
3264         }
3265
3266         transport_kunmap_data_sg(cmd);
3267         buf = NULL;
3268
3269         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3270                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3271                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3272                 iport_ptr : "");
3273         /*
3274          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3275          * action specifies a TransportID that is the same as the initiator port
3276          * of the I_T nexus for the command received, then the command shall
3277          * be terminated with CHECK CONDITION status, with the sense key set to
3278          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3279          * IN PARAMETER LIST.
3280          */
3281         pr_reg_nacl = pr_reg->pr_reg_nacl;
3282         matching_iname = (!strcmp(initiator_str,
3283                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3284         if (!matching_iname)
3285                 goto after_iport_check;
3286
3287         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3288                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3289                         " matches: %s on received I_T Nexus\n", initiator_str,
3290                         pr_reg_nacl->initiatorname);
3291                 ret = TCM_INVALID_PARAMETER_LIST;
3292                 goto out;
3293         }
3294         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3295                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3296                         " matches: %s %s on received I_T Nexus\n",
3297                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3298                         pr_reg->pr_reg_isid);
3299                 ret = TCM_INVALID_PARAMETER_LIST;
3300                 goto out;
3301         }
3302 after_iport_check:
3303         /*
3304          * Locate the destination struct se_node_acl from the received Transport ID
3305          */
3306         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3307         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3308                                 initiator_str);
3309         if (dest_node_acl)
3310                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3311         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3312
3313         if (!dest_node_acl) {
3314                 pr_err("Unable to locate %s dest_node_acl for"
3315                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3316                         initiator_str);
3317                 ret = TCM_INVALID_PARAMETER_LIST;
3318                 goto out;
3319         }
3320
3321         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3322                 pr_err("core_scsi3_nodeacl_depend_item() for"
3323                         " dest_node_acl\n");
3324                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3325                 dest_node_acl = NULL;
3326                 ret = TCM_INVALID_PARAMETER_LIST;
3327                 goto out;
3328         }
3329
3330         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3331                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3332                 dest_node_acl->initiatorname);
3333
3334         /*
3335          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3336          * PORT IDENTIFIER.
3337          */
3338         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3339         if (!dest_se_deve) {
3340                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3341                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3342                 ret = TCM_INVALID_PARAMETER_LIST;
3343                 goto out;
3344         }
3345
3346         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3347                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3348                 atomic_dec_mb(&dest_se_deve->pr_ref_count);
3349                 dest_se_deve = NULL;
3350                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3351                 goto out;
3352         }
3353
3354         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3355                 " ACL for dest_se_deve->mapped_lun: %u\n",
3356                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3357                 dest_se_deve->mapped_lun);
3358
3359         /*
3360          * A persistent reservation needs to already existing in order to
3361          * successfully complete the REGISTER_AND_MOVE service action..
3362          */
3363         spin_lock(&dev->dev_reservation_lock);
3364         pr_res_holder = dev->dev_pr_res_holder;
3365         if (!pr_res_holder) {
3366                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3367                         " currently held\n");
3368                 spin_unlock(&dev->dev_reservation_lock);
3369                 ret = TCM_INVALID_CDB_FIELD;
3370                 goto out;
3371         }
3372         /*
3373          * The received on I_T Nexus must be the reservation holder.
3374          *
3375          * From spc4r17 section 5.7.8  Table 50 --
3376          *      Register behaviors for a REGISTER AND MOVE service action
3377          */
3378         if (pr_res_holder != pr_reg) {
3379                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3380                         " Nexus is not reservation holder\n");
3381                 spin_unlock(&dev->dev_reservation_lock);
3382                 ret = TCM_RESERVATION_CONFLICT;
3383                 goto out;
3384         }
3385         /*
3386          * From spc4r17 section 5.7.8: registering and moving reservation
3387          *
3388          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3389          * action is received and the established persistent reservation is a
3390          * Write Exclusive - All Registrants type or Exclusive Access -
3391          * All Registrants type reservation, then the command shall be completed
3392          * with RESERVATION CONFLICT status.
3393          */
3394         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3395             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3396                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3397                         " reservation for type: %s\n",
3398                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3399                 spin_unlock(&dev->dev_reservation_lock);
3400                 ret = TCM_RESERVATION_CONFLICT;
3401                 goto out;
3402         }
3403         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3404         /*
3405          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3406          */
3407         type = pr_res_holder->pr_res_type;
3408         scope = pr_res_holder->pr_res_type;
3409         /*
3410          * c) Associate the reservation key specified in the SERVICE ACTION
3411          *    RESERVATION KEY field with the I_T nexus specified as the
3412          *    destination of the register and move, where:
3413          *    A) The I_T nexus is specified by the TransportID and the
3414          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3415          *    B) Regardless of the TransportID format used, the association for
3416          *       the initiator port is based on either the initiator port name
3417          *       (see 3.1.71) on SCSI transport protocols where port names are
3418          *       required or the initiator port identifier (see 3.1.70) on SCSI
3419          *       transport protocols where port names are not required;
3420          * d) Register the reservation key specified in the SERVICE ACTION
3421          *    RESERVATION KEY field;
3422          * e) Retain the reservation key specified in the SERVICE ACTION
3423          *    RESERVATION KEY field and associated information;
3424          *
3425          * Also, It is not an error for a REGISTER AND MOVE service action to
3426          * register an I_T nexus that is already registered with the same
3427          * reservation key or a different reservation key.
3428          */
3429         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3430                                         iport_ptr);
3431         if (!dest_pr_reg) {
3432                 if (core_scsi3_alloc_registration(cmd->se_dev,
3433                                 dest_node_acl, dest_se_deve, iport_ptr,
3434                                 sa_res_key, 0, aptpl, 2, 1)) {
3435                         spin_unlock(&dev->dev_reservation_lock);
3436                         ret = TCM_INVALID_PARAMETER_LIST;
3437                         goto out;
3438                 }
3439                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3440                                                 iport_ptr);
3441                 new_reg = 1;
3442         }
3443         /*
3444          * f) Release the persistent reservation for the persistent reservation
3445          *    holder (i.e., the I_T nexus on which the
3446          */
3447         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3448                                           dev->dev_pr_res_holder, 0, 0);
3449         /*
3450          * g) Move the persistent reservation to the specified I_T nexus using
3451          *    the same scope and type as the persistent reservation released in
3452          *    item f); and
3453          */
3454         dev->dev_pr_res_holder = dest_pr_reg;
3455         dest_pr_reg->pr_res_holder = 1;
3456         dest_pr_reg->pr_res_type = type;
3457         pr_reg->pr_res_scope = scope;
3458         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3459         /*
3460          * Increment PRGeneration for existing registrations..
3461          */
3462         if (!new_reg)
3463                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3464         spin_unlock(&dev->dev_reservation_lock);
3465
3466         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3467                 " created new reservation holder TYPE: %s on object RTPI:"
3468                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3469                 core_scsi3_pr_dump_type(type), rtpi,
3470                 dest_pr_reg->pr_res_generation);
3471         pr_debug("SPC-3 PR Successfully moved reservation from"
3472                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3473                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3474                 i_buf, dest_tf_ops->get_fabric_name(),
3475                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3476                 iport_ptr : "");
3477         /*
3478          * It is now safe to release configfs group dependencies for destination
3479          * of Transport ID Initiator Device/Port Identifier
3480          */
3481         core_scsi3_lunacl_undepend_item(dest_se_deve);
3482         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3483         core_scsi3_tpg_undepend_item(dest_se_tpg);
3484         /*
3485          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3486          * nexus on which PERSISTENT RESERVE OUT command was received.
3487          */
3488         if (unreg) {
3489                 spin_lock(&pr_tmpl->registration_lock);
3490                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3491                 spin_unlock(&pr_tmpl->registration_lock);
3492         } else
3493                 core_scsi3_put_pr_reg(pr_reg);
3494
3495         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3496
3497         transport_kunmap_data_sg(cmd);
3498
3499         core_scsi3_put_pr_reg(dest_pr_reg);
3500         return 0;
3501 out:
3502         if (buf)
3503                 transport_kunmap_data_sg(cmd);
3504         if (dest_se_deve)
3505                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3506         if (dest_node_acl)
3507                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3508         core_scsi3_tpg_undepend_item(dest_se_tpg);
3509
3510 out_put_pr_reg:
3511         core_scsi3_put_pr_reg(pr_reg);
3512         return ret;
3513 }
3514
3515 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3516 {
3517         unsigned int __v1, __v2;
3518
3519         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3520         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3521
3522         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3523 }
3524
3525 /*
3526  * See spc4r17 section 6.14 Table 170
3527  */
3528 sense_reason_t
3529 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3530 {
3531         struct se_device *dev = cmd->se_dev;
3532         unsigned char *cdb = &cmd->t_task_cdb[0];
3533         unsigned char *buf;
3534         u64 res_key, sa_res_key;
3535         int sa, scope, type, aptpl;
3536         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3537         sense_reason_t ret;
3538
3539         /*
3540          * Following spc2r20 5.5.1 Reservations overview:
3541          *
3542          * If a logical unit has been reserved by any RESERVE command and is
3543          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3544          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3545          * initiator or service action and shall terminate with a RESERVATION
3546          * CONFLICT status.
3547          */
3548         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3549                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3550                         " SPC-2 reservation is held, returning"
3551                         " RESERVATION_CONFLICT\n");
3552                 return TCM_RESERVATION_CONFLICT;
3553         }
3554
3555         /*
3556          * FIXME: A NULL struct se_session pointer means an this is not coming from
3557          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3558          */
3559         if (!cmd->se_sess)
3560                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3561
3562         if (cmd->data_length < 24) {
3563                 pr_warn("SPC-PR: Received PR OUT parameter list"
3564                         " length too small: %u\n", cmd->data_length);
3565                 return TCM_INVALID_PARAMETER_LIST;
3566         }
3567
3568         /*
3569          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3570          */
3571         sa = (cdb[1] & 0x1f);
3572         scope = (cdb[2] & 0xf0);
3573         type = (cdb[2] & 0x0f);
3574
3575         buf = transport_kmap_data_sg(cmd);
3576         if (!buf)
3577                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3578
3579         /*
3580          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3581          */
3582         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3583         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3584         /*
3585          * REGISTER_AND_MOVE uses a different SA parameter list containing
3586          * SCSI TransportIDs.
3587          */
3588         if (sa != PRO_REGISTER_AND_MOVE) {
3589                 spec_i_pt = (buf[20] & 0x08);
3590                 all_tg_pt = (buf[20] & 0x04);
3591                 aptpl = (buf[20] & 0x01);
3592         } else {
3593                 aptpl = (buf[17] & 0x01);
3594                 unreg = (buf[17] & 0x02);
3595         }
3596         /*
3597          * If the backend device has been configured to force APTPL metadata
3598          * write-out, go ahead and propigate aptpl=1 down now.
3599          */
3600         if (dev->dev_attrib.force_pr_aptpl)
3601                 aptpl = 1;
3602
3603         transport_kunmap_data_sg(cmd);
3604         buf = NULL;
3605
3606         /*
3607          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3608          */
3609         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3610                 return TCM_INVALID_PARAMETER_LIST;
3611
3612         /*
3613          * From spc4r17 section 6.14:
3614          *
3615          * If the SPEC_I_PT bit is set to zero, the service action is not
3616          * REGISTER AND MOVE, and the parameter list length is not 24, then
3617          * the command shall be terminated with CHECK CONDITION status, with
3618          * the sense key set to ILLEGAL REQUEST, and the additional sense
3619          * code set to PARAMETER LIST LENGTH ERROR.
3620          */
3621         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3622             (cmd->data_length != 24)) {
3623                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3624                         " list length: %u\n", cmd->data_length);
3625                 return TCM_INVALID_PARAMETER_LIST;
3626         }
3627
3628         /*
3629          * (core_scsi3_emulate_pro_* function parameters
3630          * are defined by spc4r17 Table 174:
3631          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3632          */
3633         switch (sa) {
3634         case PRO_REGISTER:
3635                 ret = core_scsi3_emulate_pro_register(cmd,
3636                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3637                 break;
3638         case PRO_RESERVE:
3639                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3640                 break;
3641         case PRO_RELEASE:
3642                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3643                 break;
3644         case PRO_CLEAR:
3645                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3646                 break;
3647         case PRO_PREEMPT:
3648                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3649                                         res_key, sa_res_key, PREEMPT);
3650                 break;
3651         case PRO_PREEMPT_AND_ABORT:
3652                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3653                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3654                 break;
3655         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3656                 ret = core_scsi3_emulate_pro_register(cmd,
3657                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3658                 break;
3659         case PRO_REGISTER_AND_MOVE:
3660                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3661                                 sa_res_key, aptpl, unreg);
3662                 break;
3663         default:
3664                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3665                         " action: 0x%02x\n", cdb[1] & 0x1f);
3666                 return TCM_INVALID_CDB_FIELD;
3667         }
3668
3669         if (!ret)
3670                 target_complete_cmd(cmd, GOOD);
3671         return ret;
3672 }
3673
3674 /*
3675  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3676  *
3677  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3678  */
3679 static sense_reason_t
3680 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3681 {
3682         struct se_device *dev = cmd->se_dev;
3683         struct t10_pr_registration *pr_reg;
3684         unsigned char *buf;
3685         u32 add_len = 0, off = 8;
3686
3687         if (cmd->data_length < 8) {
3688                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3689                         " too small\n", cmd->data_length);
3690                 return TCM_INVALID_CDB_FIELD;
3691         }
3692
3693         buf = transport_kmap_data_sg(cmd);
3694         if (!buf)
3695                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3696
3697         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3698         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3699         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3700         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3701
3702         spin_lock(&dev->t10_pr.registration_lock);
3703         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3704                         pr_reg_list) {
3705                 /*
3706                  * Check for overflow of 8byte PRI READ_KEYS payload and
3707                  * next reservation key list descriptor.
3708                  */
3709                 if ((add_len + 8) > (cmd->data_length - 8))
3710                         break;
3711
3712                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3713                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3714                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3715                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3716                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3717                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3718                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3719                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3720
3721                 add_len += 8;
3722         }
3723         spin_unlock(&dev->t10_pr.registration_lock);
3724
3725         buf[4] = ((add_len >> 24) & 0xff);
3726         buf[5] = ((add_len >> 16) & 0xff);
3727         buf[6] = ((add_len >> 8) & 0xff);
3728         buf[7] = (add_len & 0xff);
3729
3730         transport_kunmap_data_sg(cmd);
3731
3732         return 0;
3733 }
3734
3735 /*
3736  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3737  *
3738  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3739  */
3740 static sense_reason_t
3741 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3742 {
3743         struct se_device *dev = cmd->se_dev;
3744         struct t10_pr_registration *pr_reg;
3745         unsigned char *buf;
3746         u64 pr_res_key;
3747         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3748
3749         if (cmd->data_length < 8) {
3750                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3751                         " too small\n", cmd->data_length);
3752                 return TCM_INVALID_CDB_FIELD;
3753         }
3754
3755         buf = transport_kmap_data_sg(cmd);
3756         if (!buf)
3757                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3758
3759         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3760         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3761         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3762         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3763
3764         spin_lock(&dev->dev_reservation_lock);
3765         pr_reg = dev->dev_pr_res_holder;
3766         if (pr_reg) {
3767                 /*
3768                  * Set the hardcoded Additional Length
3769                  */
3770                 buf[4] = ((add_len >> 24) & 0xff);
3771                 buf[5] = ((add_len >> 16) & 0xff);
3772                 buf[6] = ((add_len >> 8) & 0xff);
3773                 buf[7] = (add_len & 0xff);
3774
3775                 if (cmd->data_length < 22)
3776                         goto err;
3777
3778                 /*
3779                  * Set the Reservation key.
3780                  *
3781                  * From spc4r17, section 5.7.10:
3782                  * A persistent reservation holder has its reservation key
3783                  * returned in the parameter data from a PERSISTENT
3784                  * RESERVE IN command with READ RESERVATION service action as
3785                  * follows:
3786                  * a) For a persistent reservation of the type Write Exclusive
3787                  *    - All Registrants or Exclusive Access  All Regitrants,
3788                  *      the reservation key shall be set to zero; or
3789                  * b) For all other persistent reservation types, the
3790                  *    reservation key shall be set to the registered
3791                  *    reservation key for the I_T nexus that holds the
3792                  *    persistent reservation.
3793                  */
3794                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3795                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3796                         pr_res_key = 0;
3797                 else
3798                         pr_res_key = pr_reg->pr_res_key;
3799
3800                 buf[8] = ((pr_res_key >> 56) & 0xff);
3801                 buf[9] = ((pr_res_key >> 48) & 0xff);
3802                 buf[10] = ((pr_res_key >> 40) & 0xff);
3803                 buf[11] = ((pr_res_key >> 32) & 0xff);
3804                 buf[12] = ((pr_res_key >> 24) & 0xff);
3805                 buf[13] = ((pr_res_key >> 16) & 0xff);
3806                 buf[14] = ((pr_res_key >> 8) & 0xff);
3807                 buf[15] = (pr_res_key & 0xff);
3808                 /*
3809                  * Set the SCOPE and TYPE
3810                  */
3811                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3812                           (pr_reg->pr_res_type & 0x0f);
3813         }
3814
3815 err:
3816         spin_unlock(&dev->dev_reservation_lock);
3817         transport_kunmap_data_sg(cmd);
3818
3819         return 0;
3820 }
3821
3822 /*
3823  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3824  *
3825  * See spc4r17 section 6.13.4 Table 165
3826  */
3827 static sense_reason_t
3828 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3829 {
3830         struct se_device *dev = cmd->se_dev;
3831         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3832         unsigned char *buf;
3833         u16 add_len = 8; /* Hardcoded to 8. */
3834
3835         if (cmd->data_length < 6) {
3836                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3837                         " %u too small\n", cmd->data_length);
3838                 return TCM_INVALID_CDB_FIELD;
3839         }
3840
3841         buf = transport_kmap_data_sg(cmd);
3842         if (!buf)
3843                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3844
3845         buf[0] = ((add_len >> 8) & 0xff);
3846         buf[1] = (add_len & 0xff);
3847         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3848         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3849         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3850         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3851         /*
3852          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3853          * set the TMV: Task Mask Valid bit.
3854          */
3855         buf[3] |= 0x80;
3856         /*
3857          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3858          */
3859         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3860         /*
3861          * PTPL_A: Persistence across Target Power Loss Active bit
3862          */
3863         if (pr_tmpl->pr_aptpl_active)
3864                 buf[3] |= 0x01;
3865         /*
3866          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3867          */
3868         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3869         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3870         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3871         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3872         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3873         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3874
3875         transport_kunmap_data_sg(cmd);
3876
3877         return 0;
3878 }
3879
3880 /*
3881  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3882  *
3883  * See spc4r17 section 6.13.5 Table 168 and 169
3884  */
3885 static sense_reason_t
3886 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3887 {
3888         struct se_device *dev = cmd->se_dev;
3889         struct se_node_acl *se_nacl;
3890         struct se_portal_group *se_tpg;
3891         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3892         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3893         unsigned char *buf;
3894         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3895         u32 off = 8; /* off into first Full Status descriptor */
3896         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3897         bool all_reg = false;
3898
3899         if (cmd->data_length < 8) {
3900                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3901                         " too small\n", cmd->data_length);
3902                 return TCM_INVALID_CDB_FIELD;
3903         }
3904
3905         buf = transport_kmap_data_sg(cmd);
3906         if (!buf)
3907                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3908
3909         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3910         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3911         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3912         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3913
3914         spin_lock(&dev->dev_reservation_lock);
3915         if (dev->dev_pr_res_holder) {
3916                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3917
3918                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3919                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3920                         all_reg = true;
3921                         pr_res_type = pr_holder->pr_res_type;
3922                         pr_res_scope = pr_holder->pr_res_scope;
3923                 }
3924         }
3925         spin_unlock(&dev->dev_reservation_lock);
3926
3927         spin_lock(&pr_tmpl->registration_lock);
3928         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3929                         &pr_tmpl->registration_list, pr_reg_list) {
3930
3931                 se_nacl = pr_reg->pr_reg_nacl;
3932                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3933                 add_desc_len = 0;
3934
3935                 atomic_inc_mb(&pr_reg->pr_res_holders);
3936                 spin_unlock(&pr_tmpl->registration_lock);
3937                 /*
3938                  * Determine expected length of $FABRIC_MOD specific
3939                  * TransportID full status descriptor..
3940                  */
3941                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
3942                                 se_tpg, se_nacl, pr_reg, &format_code);
3943
3944                 if ((exp_desc_len + add_len) > cmd->data_length) {
3945                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3946                                 " out of buffer: %d\n", cmd->data_length);
3947                         spin_lock(&pr_tmpl->registration_lock);
3948                         atomic_dec_mb(&pr_reg->pr_res_holders);
3949                         break;
3950                 }
3951                 /*
3952                  * Set RESERVATION KEY
3953                  */
3954                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3955                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3956                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3957                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3958                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3959                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3960                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3961                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3962                 off += 4; /* Skip Over Reserved area */
3963
3964                 /*
3965                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3966                  */
3967                 if (pr_reg->pr_reg_all_tg_pt)
3968                         buf[off] = 0x02;
3969                 /*
3970                  * The struct se_lun pointer will be present for the
3971                  * reservation holder for PR_HOLDER bit.
3972                  *
3973                  * Also, if this registration is the reservation
3974                  * holder or there is an All Registrants reservation
3975                  * active, fill in SCOPE and TYPE in the next byte.
3976                  */
3977                 if (pr_reg->pr_res_holder) {
3978                         buf[off++] |= 0x01;
3979                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3980                                      (pr_reg->pr_res_type & 0x0f);
3981                 } else if (all_reg) {
3982                         buf[off++] |= 0x01;
3983                         buf[off++] = (pr_res_scope & 0xf0) |
3984                                      (pr_res_type & 0x0f);
3985                 } else {
3986                         off += 2;
3987                 }
3988
3989                 off += 4; /* Skip over reserved area */
3990                 /*
3991                  * From spc4r17 6.3.15:
3992                  *
3993                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3994                  * IDENTIFIER field contains the relative port identifier (see
3995                  * 3.1.120) of the target port that is part of the I_T nexus
3996                  * described by this full status descriptor. If the ALL_TG_PT
3997                  * bit is set to one, the contents of the RELATIVE TARGET PORT
3998                  * IDENTIFIER field are not defined by this standard.
3999                  */
4000                 if (!pr_reg->pr_reg_all_tg_pt) {
4001                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4002
4003                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4004                         buf[off++] = (port->sep_rtpi & 0xff);
4005                 } else
4006                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4007
4008                 /*
4009                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4010                  */
4011                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4012                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4013
4014                 spin_lock(&pr_tmpl->registration_lock);
4015                 atomic_dec_mb(&pr_reg->pr_res_holders);
4016                 /*
4017                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4018                  */
4019                 buf[off++] = ((desc_len >> 24) & 0xff);
4020                 buf[off++] = ((desc_len >> 16) & 0xff);
4021                 buf[off++] = ((desc_len >> 8) & 0xff);
4022                 buf[off++] = (desc_len & 0xff);
4023                 /*
4024                  * Size of full desctipor header minus TransportID
4025                  * containing $FABRIC_MOD specific) initiator device/port
4026                  * WWN information.
4027                  *
4028                  *  See spc4r17 Section 6.13.5 Table 169
4029                  */
4030                 add_desc_len = (24 + desc_len);
4031
4032                 off += desc_len;
4033                 add_len += add_desc_len;
4034         }
4035         spin_unlock(&pr_tmpl->registration_lock);
4036         /*
4037          * Set ADDITIONAL_LENGTH
4038          */
4039         buf[4] = ((add_len >> 24) & 0xff);
4040         buf[5] = ((add_len >> 16) & 0xff);
4041         buf[6] = ((add_len >> 8) & 0xff);
4042         buf[7] = (add_len & 0xff);
4043
4044         transport_kunmap_data_sg(cmd);
4045
4046         return 0;
4047 }
4048
4049 sense_reason_t
4050 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4051 {
4052         sense_reason_t ret;
4053
4054         /*
4055          * Following spc2r20 5.5.1 Reservations overview:
4056          *
4057          * If a logical unit has been reserved by any RESERVE command and is
4058          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4059          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4060          * initiator or service action and shall terminate with a RESERVATION
4061          * CONFLICT status.
4062          */
4063         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4064                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4065                         " SPC-2 reservation is held, returning"
4066                         " RESERVATION_CONFLICT\n");
4067                 return TCM_RESERVATION_CONFLICT;
4068         }
4069
4070         switch (cmd->t_task_cdb[1] & 0x1f) {
4071         case PRI_READ_KEYS:
4072                 ret = core_scsi3_pri_read_keys(cmd);
4073                 break;
4074         case PRI_READ_RESERVATION:
4075                 ret = core_scsi3_pri_read_reservation(cmd);
4076                 break;
4077         case PRI_REPORT_CAPABILITIES:
4078                 ret = core_scsi3_pri_report_capabilities(cmd);
4079                 break;
4080         case PRI_READ_FULL_STATUS:
4081                 ret = core_scsi3_pri_read_full_status(cmd);
4082                 break;
4083         default:
4084                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4085                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4086                 return TCM_INVALID_CDB_FIELD;
4087         }
4088
4089         if (!ret)
4090                 target_complete_cmd(cmd, GOOD);
4091         return ret;
4092 }
4093
4094 sense_reason_t
4095 target_check_reservation(struct se_cmd *cmd)
4096 {
4097         struct se_device *dev = cmd->se_dev;
4098         sense_reason_t ret;
4099
4100         if (!cmd->se_sess)
4101                 return 0;
4102         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4103                 return 0;
4104         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4105                 return 0;
4106
4107         spin_lock(&dev->dev_reservation_lock);
4108         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4109                 ret = target_scsi2_reservation_check(cmd);
4110         else
4111                 ret = target_scsi3_pr_reservation_check(cmd);
4112         spin_unlock(&dev->dev_reservation_lock);
4113
4114         return ret;
4115 }