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  * Copyright (c) 2009, 2010 Rising Tide Systems
   8  * Copyright (c) 2009, 2010 Linux-iSCSI.org
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  *
  26  ******************************************************************************/
  27
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/list.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 int 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                 return 0;
  63
  64         snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
  65         return 1;
  66 }
  67
  68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  69                         struct t10_pr_registration *, int);
  70
  71 static int core_scsi2_reservation_seq_non_holder(
  72         struct se_cmd *cmd,
  73         unsigned char *cdb,
  74         u32 pr_reg_type)
  75 {
  76         switch (cdb[0]) {
  77         case INQUIRY:
  78         case RELEASE:
  79         case RELEASE_10:
  80                 return 0;
  81         default:
  82                 return 1;
  83         }
  84
  85         return 1;
  86 }
  87
  88 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
  89 {
  90         struct se_device *dev = cmd->se_dev;
  91         struct se_session *sess = cmd->se_sess;
  92         int ret;
  93
  94         if (!sess)
  95                 return 0;
  96
  97         spin_lock(&dev->dev_reservation_lock);
  98         if (!dev->dev_reserved_node_acl || !sess) {
  99                 spin_unlock(&dev->dev_reservation_lock);
 100                 return 0;
 101         }
 102         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 103                 spin_unlock(&dev->dev_reservation_lock);
 104                 return -EINVAL;
 105         }
 106         if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
 107                 spin_unlock(&dev->dev_reservation_lock);
 108                 return 0;
 109         }
 110         ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
 111         spin_unlock(&dev->dev_reservation_lock);
 112
 113         return ret;
 114 }
 115
 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 117                                         struct se_node_acl *, struct se_session *);
 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 119
 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 121 {
 122         struct se_session *se_sess = cmd->se_sess;
 123         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 124         struct t10_pr_registration *pr_reg;
 125         struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
 126         int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
 127         int conflict = 0;
 128
 129         if (!crh)
 130                 return -EINVAL;
 131
 132         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 133                         se_sess);
 134         if (pr_reg) {
 135                 /*
 136                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 137                  * behavior
 138                  *
 139                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 140                  * status, but no reservation shall be established and the
 141                  * persistent reservation shall not be changed, if the command
 142                  * is received from a) and b) below.
 143                  *
 144                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 145                  * status, but the persistent reservation shall not be released,
 146                  * if the command is received from a) and b)
 147                  *
 148                  * a) An I_T nexus that is a persistent reservation holder; or
 149                  * b) An I_T nexus that is registered if a registrants only or
 150                  *    all registrants type persistent reservation is present.
 151                  *
 152                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 153                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 154                  * as defined in SPC-2.
 155                  */
 156                 if (pr_reg->pr_res_holder) {
 157                         core_scsi3_put_pr_reg(pr_reg);
 158                         return 1;
 159                 }
 160                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 161                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 162                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 163                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 164                         core_scsi3_put_pr_reg(pr_reg);
 165                         return 1;
 166                 }
 167                 core_scsi3_put_pr_reg(pr_reg);
 168                 conflict = 1;
 169         } else {
 170                 /*
 171                  * Following spc2r20 5.5.1 Reservations overview:
 172                  *
 173                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 174                  * command with the REGISTER or the REGISTER AND IGNORE
 175                  * EXISTING KEY service action and is still registered by any
 176                  * initiator, all RESERVE commands and all RELEASE commands
 177                  * regardless of initiator shall conflict and shall terminate
 178                  * with a RESERVATION CONFLICT status.
 179                  */
 180                 spin_lock(&pr_tmpl->registration_lock);
 181                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 182                 spin_unlock(&pr_tmpl->registration_lock);
 183         }
 184
 185         if (conflict) {
 186                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 187                         " while active SPC-3 registrations exist,"
 188                         " returning RESERVATION_CONFLICT\n");
 189                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 190                 return -EBUSY;
 191         }
 192
 193         return 0;
 194 }
 195
 196 int target_scsi2_reservation_release(struct se_cmd *cmd)
 197 {
 198         struct se_device *dev = cmd->se_dev;
 199         struct se_session *sess = cmd->se_sess;
 200         struct se_portal_group *tpg;
 201         int ret = 0, rc;
 202
 203         if (!sess || !sess->se_tpg)
 204                 goto out;
 205         rc = target_check_scsi2_reservation_conflict(cmd);
 206         if (rc == 1)
 207                 goto out;
 208         else if (rc < 0) {
 209                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 210                 ret = -EINVAL;
 211                 goto out;
 212         }
 213
 214         ret = 0;
 215         spin_lock(&dev->dev_reservation_lock);
 216         if (!dev->dev_reserved_node_acl || !sess)
 217                 goto out_unlock;
 218
 219         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 220                 goto out_unlock;
 221
 222         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 223                 goto out_unlock;
 224
 225         dev->dev_reserved_node_acl = NULL;
 226         dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 227         if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
 228                 dev->dev_res_bin_isid = 0;
 229                 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
 230         }
 231         tpg = sess->se_tpg;
 232         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 233                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 234                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 235                 sess->se_node_acl->initiatorname);
 236
 237 out_unlock:
 238         spin_unlock(&dev->dev_reservation_lock);
 239 out:
 240         if (!ret)
 241                 target_complete_cmd(cmd, GOOD);
 242         return ret;
 243 }
 244
 245 int target_scsi2_reservation_reserve(struct se_cmd *cmd)
 246 {
 247         struct se_device *dev = cmd->se_dev;
 248         struct se_session *sess = cmd->se_sess;
 249         struct se_portal_group *tpg;
 250         int ret = 0, rc;
 251
 252         if ((cmd->t_task_cdb[1] & 0x01) &&
 253             (cmd->t_task_cdb[1] & 0x02)) {
 254                 pr_err("LongIO and Obselete Bits set, returning"
 255                                 " ILLEGAL_REQUEST\n");
 256                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
 257                 ret = -EINVAL;
 258                 goto out;
 259         }
 260         /*
 261          * This is currently the case for target_core_mod passthrough struct se_cmd
 262          * ops
 263          */
 264         if (!sess || !sess->se_tpg)
 265                 goto out;
 266         rc = target_check_scsi2_reservation_conflict(cmd);
 267         if (rc == 1)
 268                 goto out;
 269         else if (rc < 0) {
 270                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 271                 ret = -EINVAL;
 272                 goto out;
 273         }
 274
 275         ret = 0;
 276         tpg = sess->se_tpg;
 277         spin_lock(&dev->dev_reservation_lock);
 278         if (dev->dev_reserved_node_acl &&
 279            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 280                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 281                         tpg->se_tpg_tfo->get_fabric_name());
 282                 pr_err("Original reserver LUN: %u %s\n",
 283                         cmd->se_lun->unpacked_lun,
 284                         dev->dev_reserved_node_acl->initiatorname);
 285                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 286                         " from %s \n", cmd->se_lun->unpacked_lun,
 287                         cmd->se_deve->mapped_lun,
 288                         sess->se_node_acl->initiatorname);
 289                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 290                 ret = -EINVAL;
 291                 goto out_unlock;
 292         }
 293
 294         dev->dev_reserved_node_acl = sess->se_node_acl;
 295         dev->dev_flags |= DF_SPC2_RESERVATIONS;
 296         if (sess->sess_bin_isid != 0) {
 297                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 298                 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
 299         }
 300         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 301                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 302                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 303                 sess->se_node_acl->initiatorname);
 304
 305 out_unlock:
 306         spin_unlock(&dev->dev_reservation_lock);
 307 out:
 308         if (!ret)
 309                 target_complete_cmd(cmd, GOOD);
 310         return ret;
 311 }
 312
 313
 314 /*
 315  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 316  *
 317  * This function is called by those initiator ports who are *NOT*
 318  * the active PR reservation holder when a reservation is present.
 319  */
 320 static int core_scsi3_pr_seq_non_holder(
 321         struct se_cmd *cmd,
 322         unsigned char *cdb,
 323         u32 pr_reg_type)
 324 {
 325         struct se_dev_entry *se_deve;
 326         struct se_session *se_sess = cmd->se_sess;
 327         int other_cdb = 0, ignore_reg;
 328         int registered_nexus = 0, ret = 1; /* Conflict by default */
 329         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 330         int we = 0; /* Write Exclusive */
 331         int legacy = 0; /* Act like a legacy device and return
 332                          * RESERVATION CONFLICT on some CDBs */
 333         /*
 334          * A legacy SPC-2 reservation is being held.
 335          */
 336         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
 337                 return core_scsi2_reservation_seq_non_holder(cmd,
 338                                         cdb, pr_reg_type);
 339
 340         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 341         /*
 342          * Determine if the registration should be ignored due to
 343          * non-matching ISIDs in core_scsi3_pr_reservation_check().
 344          */
 345         ignore_reg = (pr_reg_type & 0x80000000);
 346         if (ignore_reg)
 347                 pr_reg_type &= ~0x80000000;
 348
 349         switch (pr_reg_type) {
 350         case PR_TYPE_WRITE_EXCLUSIVE:
 351                 we = 1;
 352         case PR_TYPE_EXCLUSIVE_ACCESS:
 353                 /*
 354                  * Some commands are only allowed for the persistent reservation
 355                  * holder.
 356                  */
 357                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 358                         registered_nexus = 1;
 359                 break;
 360         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 361                 we = 1;
 362         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 363                 /*
 364                  * Some commands are only allowed for registered I_T Nexuses.
 365                  */
 366                 reg_only = 1;
 367                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 368                         registered_nexus = 1;
 369                 break;
 370         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 371                 we = 1;
 372         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 373                 /*
 374                  * Each registered I_T Nexus is a reservation holder.
 375                  */
 376                 all_reg = 1;
 377                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 378                         registered_nexus = 1;
 379                 break;
 380         default:
 381                 return -EINVAL;
 382         }
 383         /*
 384          * Referenced from spc4r17 table 45 for *NON* PR holder access
 385          */
 386         switch (cdb[0]) {
 387         case SECURITY_PROTOCOL_IN:
 388                 if (registered_nexus)
 389                         return 0;
 390                 ret = (we) ? 0 : 1;
 391                 break;
 392         case MODE_SENSE:
 393         case MODE_SENSE_10:
 394         case READ_ATTRIBUTE:
 395         case READ_BUFFER:
 396         case RECEIVE_DIAGNOSTIC:
 397                 if (legacy) {
 398                         ret = 1;
 399                         break;
 400                 }
 401                 if (registered_nexus) {
 402                         ret = 0;
 403                         break;
 404                 }
 405                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 406                 break;
 407         case PERSISTENT_RESERVE_OUT:
 408                 /*
 409                  * This follows PERSISTENT_RESERVE_OUT service actions that
 410                  * are allowed in the presence of various reservations.
 411                  * See spc4r17, table 46
 412                  */
 413                 switch (cdb[1] & 0x1f) {
 414                 case PRO_CLEAR:
 415                 case PRO_PREEMPT:
 416                 case PRO_PREEMPT_AND_ABORT:
 417                         ret = (registered_nexus) ? 0 : 1;
 418                         break;
 419                 case PRO_REGISTER:
 420                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 421                         ret = 0;
 422                         break;
 423                 case PRO_REGISTER_AND_MOVE:
 424                 case PRO_RESERVE:
 425                         ret = 1;
 426                         break;
 427                 case PRO_RELEASE:
 428                         ret = (registered_nexus) ? 0 : 1;
 429                         break;
 430                 default:
 431                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 432                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 433                         return -EINVAL;
 434                 }
 435                 break;
 436         case RELEASE:
 437         case RELEASE_10:
 438                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 439                 ret = 0;
 440                 break;
 441         case RESERVE:
 442         case RESERVE_10:
 443                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 444                 ret = 0;
 445                 break;
 446         case TEST_UNIT_READY:
 447                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 448                 break;
 449         case MAINTENANCE_IN:
 450                 switch (cdb[1] & 0x1f) {
 451                 case MI_MANAGEMENT_PROTOCOL_IN:
 452                         if (registered_nexus) {
 453                                 ret = 0;
 454                                 break;
 455                         }
 456                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 457                         break;
 458                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 459                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 460                         if (legacy) {
 461                                 ret = 1;
 462                                 break;
 463                         }
 464                         if (registered_nexus) {
 465                                 ret = 0;
 466                                 break;
 467                         }
 468                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 469                         break;
 470                 case MI_REPORT_ALIASES:
 471                 case MI_REPORT_IDENTIFYING_INFORMATION:
 472                 case MI_REPORT_PRIORITY:
 473                 case MI_REPORT_TARGET_PGS:
 474                 case MI_REPORT_TIMESTAMP:
 475                         ret = 0; /* Allowed */
 476                         break;
 477                 default:
 478                         pr_err("Unknown MI Service Action: 0x%02x\n",
 479                                 (cdb[1] & 0x1f));
 480                         return -EINVAL;
 481                 }
 482                 break;
 483         case ACCESS_CONTROL_IN:
 484         case ACCESS_CONTROL_OUT:
 485         case INQUIRY:
 486         case LOG_SENSE:
 487         case READ_MEDIA_SERIAL_NUMBER:
 488         case REPORT_LUNS:
 489         case REQUEST_SENSE:
 490         case PERSISTENT_RESERVE_IN:
 491                 ret = 0; /*/ Allowed CDBs */
 492                 break;
 493         default:
 494                 other_cdb = 1;
 495                 break;
 496         }
 497         /*
 498          * Case where the CDB is explicitly allowed in the above switch
 499          * statement.
 500          */
 501         if (!ret && !other_cdb) {
 502                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 503                         " reservation holder\n", cdb[0],
 504                         core_scsi3_pr_dump_type(pr_reg_type));
 505
 506                 return ret;
 507         }
 508         /*
 509          * Check if write exclusive initiator ports *NOT* holding the
 510          * WRITE_EXCLUSIVE_* reservation.
 511          */
 512         if (we && !registered_nexus) {
 513                 if (cmd->data_direction == DMA_TO_DEVICE) {
 514                         /*
 515                          * Conflict for write exclusive
 516                          */
 517                         pr_debug("%s Conflict for unregistered nexus"
 518                                 " %s CDB: 0x%02x to %s reservation\n",
 519                                 transport_dump_cmd_direction(cmd),
 520                                 se_sess->se_node_acl->initiatorname, cdb[0],
 521                                 core_scsi3_pr_dump_type(pr_reg_type));
 522                         return 1;
 523                 } else {
 524                         /*
 525                          * Allow non WRITE CDBs for all Write Exclusive
 526                          * PR TYPEs to pass for registered and
 527                          * non-registered_nexuxes NOT holding the reservation.
 528                          *
 529                          * We only make noise for the unregisterd nexuses,
 530                          * as we expect registered non-reservation holding
 531                          * nexuses to issue CDBs.
 532                          */
 533
 534                         if (!registered_nexus) {
 535                                 pr_debug("Allowing implict CDB: 0x%02x"
 536                                         " for %s reservation on unregistered"
 537                                         " nexus\n", cdb[0],
 538                                         core_scsi3_pr_dump_type(pr_reg_type));
 539                         }
 540
 541                         return 0;
 542                 }
 543         } else if ((reg_only) || (all_reg)) {
 544                 if (registered_nexus) {
 545                         /*
 546                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 547                          * allow commands from registered nexuses.
 548                          */
 549
 550                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 551                                 " reservation\n", cdb[0],
 552                                 core_scsi3_pr_dump_type(pr_reg_type));
 553
 554                         return 0;
 555                 }
 556         }
 557         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 558                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 559                 (registered_nexus) ? "" : "un",
 560                 se_sess->se_node_acl->initiatorname, cdb[0],
 561                 core_scsi3_pr_dump_type(pr_reg_type));
 562
 563         return 1; /* Conflict by default */
 564 }
 565
 566 static u32 core_scsi3_pr_generation(struct se_device *dev)
 567 {
 568         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 569         u32 prg;
 570         /*
 571          * PRGeneration field shall contain the value of a 32-bit wrapping
 572          * counter mainted by the device server.
 573          *
 574          * Note that this is done regardless of Active Persist across
 575          * Target PowerLoss (APTPL)
 576          *
 577          * See spc4r17 section 6.3.12 READ_KEYS service action
 578          */
 579         spin_lock(&dev->dev_reservation_lock);
 580         prg = su_dev->t10_pr.pr_generation++;
 581         spin_unlock(&dev->dev_reservation_lock);
 582
 583         return prg;
 584 }
 585
 586 static int core_scsi3_pr_reservation_check(
 587         struct se_cmd *cmd,
 588         u32 *pr_reg_type)
 589 {
 590         struct se_device *dev = cmd->se_dev;
 591         struct se_session *sess = cmd->se_sess;
 592         int ret;
 593
 594         if (!sess)
 595                 return 0;
 596         /*
 597          * A legacy SPC-2 reservation is being held.
 598          */
 599         if (dev->dev_flags & DF_SPC2_RESERVATIONS)
 600                 return core_scsi2_reservation_check(cmd, pr_reg_type);
 601
 602         spin_lock(&dev->dev_reservation_lock);
 603         if (!dev->dev_pr_res_holder) {
 604                 spin_unlock(&dev->dev_reservation_lock);
 605                 return 0;
 606         }
 607         *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 608         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 609         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
 610                 spin_unlock(&dev->dev_reservation_lock);
 611                 return -EINVAL;
 612         }
 613         if (!dev->dev_pr_res_holder->isid_present_at_reg) {
 614                 spin_unlock(&dev->dev_reservation_lock);
 615                 return 0;
 616         }
 617         ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
 618                sess->sess_bin_isid) ? 0 : -EINVAL;
 619         /*
 620          * Use bit in *pr_reg_type to notify ISID mismatch in
 621          * core_scsi3_pr_seq_non_holder().
 622          */
 623         if (ret != 0)
 624                 *pr_reg_type |= 0x80000000;
 625         spin_unlock(&dev->dev_reservation_lock);
 626
 627         return ret;
 628 }
 629
 630 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 631         struct se_device *dev,
 632         struct se_node_acl *nacl,
 633         struct se_dev_entry *deve,
 634         unsigned char *isid,
 635         u64 sa_res_key,
 636         int all_tg_pt,
 637         int aptpl)
 638 {
 639         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 640         struct t10_pr_registration *pr_reg;
 641
 642         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 643         if (!pr_reg) {
 644                 pr_err("Unable to allocate struct t10_pr_registration\n");
 645                 return NULL;
 646         }
 647
 648         pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
 649                                         GFP_ATOMIC);
 650         if (!pr_reg->pr_aptpl_buf) {
 651                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 652                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 653                 return NULL;
 654         }
 655
 656         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 657         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 658         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 659         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 660         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 661         atomic_set(&pr_reg->pr_res_holders, 0);
 662         pr_reg->pr_reg_nacl = nacl;
 663         pr_reg->pr_reg_deve = deve;
 664         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 665         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 666         pr_reg->pr_res_key = sa_res_key;
 667         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 668         pr_reg->pr_reg_aptpl = aptpl;
 669         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 670         /*
 671          * If an ISID value for this SCSI Initiator Port exists,
 672          * save it to the registration now.
 673          */
 674         if (isid != NULL) {
 675                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 676                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 677                 pr_reg->isid_present_at_reg = 1;
 678         }
 679
 680         return pr_reg;
 681 }
 682
 683 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 684 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 685
 686 /*
 687  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 688  * modes.
 689  */
 690 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 691         struct se_device *dev,
 692         struct se_node_acl *nacl,
 693         struct se_dev_entry *deve,
 694         unsigned char *isid,
 695         u64 sa_res_key,
 696         int all_tg_pt,
 697         int aptpl)
 698 {
 699         struct se_dev_entry *deve_tmp;
 700         struct se_node_acl *nacl_tmp;
 701         struct se_port *port, *port_tmp;
 702         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 703         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 704         int ret;
 705         /*
 706          * Create a registration for the I_T Nexus upon which the
 707          * PROUT REGISTER was received.
 708          */
 709         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 710                         sa_res_key, all_tg_pt, aptpl);
 711         if (!pr_reg)
 712                 return NULL;
 713         /*
 714          * Return pointer to pr_reg for ALL_TG_PT=0
 715          */
 716         if (!all_tg_pt)
 717                 return pr_reg;
 718         /*
 719          * Create list of matching SCSI Initiator Port registrations
 720          * for ALL_TG_PT=1
 721          */
 722         spin_lock(&dev->se_port_lock);
 723         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 724                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 725                 smp_mb__after_atomic_inc();
 726                 spin_unlock(&dev->se_port_lock);
 727
 728                 spin_lock_bh(&port->sep_alua_lock);
 729                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 730                                         alua_port_list) {
 731                         /*
 732                          * This pointer will be NULL for demo mode MappedLUNs
 733                          * that have not been make explict via a ConfigFS
 734                          * MappedLUN group for the SCSI Initiator Node ACL.
 735                          */
 736                         if (!deve_tmp->se_lun_acl)
 737                                 continue;
 738
 739                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 740                         /*
 741                          * Skip the matching struct se_node_acl that is allocated
 742                          * above..
 743                          */
 744                         if (nacl == nacl_tmp)
 745                                 continue;
 746                         /*
 747                          * Only perform PR registrations for target ports on
 748                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 749                          * arrived.
 750                          */
 751                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 752                                 continue;
 753                         /*
 754                          * Look for a matching Initiator Node ACL in ASCII format
 755                          */
 756                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 757                                 continue;
 758
 759                         atomic_inc(&deve_tmp->pr_ref_count);
 760                         smp_mb__after_atomic_inc();
 761                         spin_unlock_bh(&port->sep_alua_lock);
 762                         /*
 763                          * Grab a configfs group dependency that is released
 764                          * for the exception path at label out: below, or upon
 765                          * completion of adding ALL_TG_PT=1 registrations in
 766                          * __core_scsi3_add_registration()
 767                          */
 768                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 769                         if (ret < 0) {
 770                                 pr_err("core_scsi3_lunacl_depend"
 771                                                 "_item() failed\n");
 772                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 773                                 smp_mb__after_atomic_dec();
 774                                 atomic_dec(&deve_tmp->pr_ref_count);
 775                                 smp_mb__after_atomic_dec();
 776                                 goto out;
 777                         }
 778                         /*
 779                          * Located a matching SCSI Initiator Port on a different
 780                          * port, allocate the pr_reg_atp and attach it to the
 781                          * pr_reg->pr_reg_atp_list that will be processed once
 782                          * the original *pr_reg is processed in
 783                          * __core_scsi3_add_registration()
 784                          */
 785                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 786                                                 nacl_tmp, deve_tmp, NULL,
 787                                                 sa_res_key, all_tg_pt, aptpl);
 788                         if (!pr_reg_atp) {
 789                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 790                                 smp_mb__after_atomic_dec();
 791                                 atomic_dec(&deve_tmp->pr_ref_count);
 792                                 smp_mb__after_atomic_dec();
 793                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 794                                 goto out;
 795                         }
 796
 797                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 798                                       &pr_reg->pr_reg_atp_list);
 799                         spin_lock_bh(&port->sep_alua_lock);
 800                 }
 801                 spin_unlock_bh(&port->sep_alua_lock);
 802
 803                 spin_lock(&dev->se_port_lock);
 804                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 805                 smp_mb__after_atomic_dec();
 806         }
 807         spin_unlock(&dev->se_port_lock);
 808
 809         return pr_reg;
 810 out:
 811         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 812                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 813                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 814                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 815                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 816         }
 817         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 818         return NULL;
 819 }
 820
 821 int core_scsi3_alloc_aptpl_registration(
 822         struct t10_reservation *pr_tmpl,
 823         u64 sa_res_key,
 824         unsigned char *i_port,
 825         unsigned char *isid,
 826         u32 mapped_lun,
 827         unsigned char *t_port,
 828         u16 tpgt,
 829         u32 target_lun,
 830         int res_holder,
 831         int all_tg_pt,
 832         u8 type)
 833 {
 834         struct t10_pr_registration *pr_reg;
 835
 836         if (!i_port || !t_port || !sa_res_key) {
 837                 pr_err("Illegal parameters for APTPL registration\n");
 838                 return -EINVAL;
 839         }
 840
 841         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 842         if (!pr_reg) {
 843                 pr_err("Unable to allocate struct t10_pr_registration\n");
 844                 return -ENOMEM;
 845         }
 846         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 847
 848         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 849         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 850         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 851         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 852         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 853         atomic_set(&pr_reg->pr_res_holders, 0);
 854         pr_reg->pr_reg_nacl = NULL;
 855         pr_reg->pr_reg_deve = NULL;
 856         pr_reg->pr_res_mapped_lun = mapped_lun;
 857         pr_reg->pr_aptpl_target_lun = target_lun;
 858         pr_reg->pr_res_key = sa_res_key;
 859         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 860         pr_reg->pr_reg_aptpl = 1;
 861         pr_reg->pr_reg_tg_pt_lun = NULL;
 862         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 863         pr_reg->pr_res_type = type;
 864         /*
 865          * If an ISID value had been saved in APTPL metadata for this
 866          * SCSI Initiator Port, restore it now.
 867          */
 868         if (isid != NULL) {
 869                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 870                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 871                 pr_reg->isid_present_at_reg = 1;
 872         }
 873         /*
 874          * Copy the i_port and t_port information from caller.
 875          */
 876         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 877         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 878         pr_reg->pr_reg_tpgt = tpgt;
 879         /*
 880          * Set pr_res_holder from caller, the pr_reg who is the reservation
 881          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 882          * the Initiator Node LUN ACL from the fabric module is created for
 883          * this registration.
 884          */
 885         pr_reg->pr_res_holder = res_holder;
 886
 887         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 888         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 889                         " metadata\n", (res_holder) ? "+reservation" : "");
 890         return 0;
 891 }
 892
 893 static void core_scsi3_aptpl_reserve(
 894         struct se_device *dev,
 895         struct se_portal_group *tpg,
 896         struct se_node_acl *node_acl,
 897         struct t10_pr_registration *pr_reg)
 898 {
 899         char i_buf[PR_REG_ISID_ID_LEN];
 900         int prf_isid;
 901
 902         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 903         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 904                                 PR_REG_ISID_ID_LEN);
 905
 906         spin_lock(&dev->dev_reservation_lock);
 907         dev->dev_pr_res_holder = pr_reg;
 908         spin_unlock(&dev->dev_reservation_lock);
 909
 910         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 911                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 912                 tpg->se_tpg_tfo->get_fabric_name(),
 913                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 914                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 915         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 916                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 917                 (prf_isid) ? &i_buf[0] : "");
 918 }
 919
 920 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 921                                 struct t10_pr_registration *, int, int);
 922
 923 static int __core_scsi3_check_aptpl_registration(
 924         struct se_device *dev,
 925         struct se_portal_group *tpg,
 926         struct se_lun *lun,
 927         u32 target_lun,
 928         struct se_node_acl *nacl,
 929         struct se_dev_entry *deve)
 930 {
 931         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 932         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
 933         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 934         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 935         u16 tpgt;
 936
 937         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 938         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 939         /*
 940          * Copy Initiator Port information from struct se_node_acl
 941          */
 942         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 943         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 944                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 945         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 946         /*
 947          * Look for the matching registrations+reservation from those
 948          * created from APTPL metadata.  Note that multiple registrations
 949          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 950          * TransportIDs.
 951          */
 952         spin_lock(&pr_tmpl->aptpl_reg_lock);
 953         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 954                                 pr_reg_aptpl_list) {
 955                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 956                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 957                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 958                      (pr_reg->pr_reg_tpgt == tpgt) &&
 959                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 960
 961                         pr_reg->pr_reg_nacl = nacl;
 962                         pr_reg->pr_reg_deve = deve;
 963                         pr_reg->pr_reg_tg_pt_lun = lun;
 964
 965                         list_del(&pr_reg->pr_reg_aptpl_list);
 966                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 967                         /*
 968                          * At this point all of the pointers in *pr_reg will
 969                          * be setup, so go ahead and add the registration.
 970                          */
 971
 972                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 973                         /*
 974                          * If this registration is the reservation holder,
 975                          * make that happen now..
 976                          */
 977                         if (pr_reg->pr_res_holder)
 978                                 core_scsi3_aptpl_reserve(dev, tpg,
 979                                                 nacl, pr_reg);
 980                         /*
 981                          * Reenable pr_aptpl_active to accept new metadata
 982                          * updates once the SCSI device is active again..
 983                          */
 984                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 985                         pr_tmpl->pr_aptpl_active = 1;
 986                 }
 987         }
 988         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 989
 990         return 0;
 991 }
 992
 993 int core_scsi3_check_aptpl_registration(
 994         struct se_device *dev,
 995         struct se_portal_group *tpg,
 996         struct se_lun *lun,
 997         struct se_lun_acl *lun_acl)
 998 {
 999         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1000         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
1001         struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
1002
1003         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1004                 return 0;
1005
1006         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1007                                 lun->unpacked_lun, nacl, deve);
1008 }
1009
1010 static void __core_scsi3_dump_registration(
1011         struct target_core_fabric_ops *tfo,
1012         struct se_device *dev,
1013         struct se_node_acl *nacl,
1014         struct t10_pr_registration *pr_reg,
1015         int register_type)
1016 {
1017         struct se_portal_group *se_tpg = nacl->se_tpg;
1018         char i_buf[PR_REG_ISID_ID_LEN];
1019         int prf_isid;
1020
1021         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1022         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1023                                 PR_REG_ISID_ID_LEN);
1024
1025         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1026                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1027                 "_AND_MOVE" : (register_type == 1) ?
1028                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1029                 (prf_isid) ? i_buf : "");
1030         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1031                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1032                 tfo->tpg_get_tag(se_tpg));
1033         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1034                 " Port(s)\n",  tfo->get_fabric_name(),
1035                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1036                 dev->transport->name);
1037         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1038                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1039                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1040                 pr_reg->pr_reg_aptpl);
1041 }
1042
1043 /*
1044  * this function can be called with struct se_device->dev_reservation_lock
1045  * when register_move = 1
1046  */
1047 static void __core_scsi3_add_registration(
1048         struct se_device *dev,
1049         struct se_node_acl *nacl,
1050         struct t10_pr_registration *pr_reg,
1051         int register_type,
1052         int register_move)
1053 {
1054         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1055         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1056         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1057         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1058
1059         /*
1060          * Increment PRgeneration counter for struct se_device upon a successful
1061          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1062          *
1063          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1064          * action, the struct se_device->dev_reservation_lock will already be held,
1065          * so we do not call core_scsi3_pr_generation() which grabs the lock
1066          * for the REGISTER.
1067          */
1068         pr_reg->pr_res_generation = (register_move) ?
1069                         su_dev->t10_pr.pr_generation++ :
1070                         core_scsi3_pr_generation(dev);
1071
1072         spin_lock(&pr_tmpl->registration_lock);
1073         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1074         pr_reg->pr_reg_deve->def_pr_registered = 1;
1075
1076         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1077         spin_unlock(&pr_tmpl->registration_lock);
1078         /*
1079          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1080          */
1081         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1082                 return;
1083         /*
1084          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1085          * allocated in __core_scsi3_alloc_registration()
1086          */
1087         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1088                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1089                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1090
1091                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1092
1093                 spin_lock(&pr_tmpl->registration_lock);
1094                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1095                               &pr_tmpl->registration_list);
1096                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1097
1098                 __core_scsi3_dump_registration(tfo, dev,
1099                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1100                                 register_type);
1101                 spin_unlock(&pr_tmpl->registration_lock);
1102                 /*
1103                  * Drop configfs group dependency reference from
1104                  * __core_scsi3_alloc_registration()
1105                  */
1106                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1107         }
1108 }
1109
1110 static int core_scsi3_alloc_registration(
1111         struct se_device *dev,
1112         struct se_node_acl *nacl,
1113         struct se_dev_entry *deve,
1114         unsigned char *isid,
1115         u64 sa_res_key,
1116         int all_tg_pt,
1117         int aptpl,
1118         int register_type,
1119         int register_move)
1120 {
1121         struct t10_pr_registration *pr_reg;
1122
1123         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1124                         sa_res_key, all_tg_pt, aptpl);
1125         if (!pr_reg)
1126                 return -EPERM;
1127
1128         __core_scsi3_add_registration(dev, nacl, pr_reg,
1129                         register_type, register_move);
1130         return 0;
1131 }
1132
1133 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1134         struct se_device *dev,
1135         struct se_node_acl *nacl,
1136         unsigned char *isid)
1137 {
1138         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1139         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1140         struct se_portal_group *tpg;
1141
1142         spin_lock(&pr_tmpl->registration_lock);
1143         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1144                         &pr_tmpl->registration_list, pr_reg_list) {
1145                 /*
1146                  * First look for a matching struct se_node_acl
1147                  */
1148                 if (pr_reg->pr_reg_nacl != nacl)
1149                         continue;
1150
1151                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1152                 /*
1153                  * If this registration does NOT contain a fabric provided
1154                  * ISID, then we have found a match.
1155                  */
1156                 if (!pr_reg->isid_present_at_reg) {
1157                         /*
1158                          * Determine if this SCSI device server requires that
1159                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1160                          * for fabric modules (iSCSI) requiring them.
1161                          */
1162                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1163                                 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1164                                         continue;
1165                         }
1166                         atomic_inc(&pr_reg->pr_res_holders);
1167                         smp_mb__after_atomic_inc();
1168                         spin_unlock(&pr_tmpl->registration_lock);
1169                         return pr_reg;
1170                 }
1171                 /*
1172                  * If the *pr_reg contains a fabric defined ISID for multi-value
1173                  * SCSI Initiator Port TransportIDs, then we expect a valid
1174                  * matching ISID to be provided by the local SCSI Initiator Port.
1175                  */
1176                 if (!isid)
1177                         continue;
1178                 if (strcmp(isid, pr_reg->pr_reg_isid))
1179                         continue;
1180
1181                 atomic_inc(&pr_reg->pr_res_holders);
1182                 smp_mb__after_atomic_inc();
1183                 spin_unlock(&pr_tmpl->registration_lock);
1184                 return pr_reg;
1185         }
1186         spin_unlock(&pr_tmpl->registration_lock);
1187
1188         return NULL;
1189 }
1190
1191 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1192         struct se_device *dev,
1193         struct se_node_acl *nacl,
1194         struct se_session *sess)
1195 {
1196         struct se_portal_group *tpg = nacl->se_tpg;
1197         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1198
1199         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1200                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1201                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1202                                         PR_REG_ISID_LEN);
1203                 isid_ptr = &buf[0];
1204         }
1205
1206         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1207 }
1208
1209 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1210 {
1211         atomic_dec(&pr_reg->pr_res_holders);
1212         smp_mb__after_atomic_dec();
1213 }
1214
1215 static int core_scsi3_check_implict_release(
1216         struct se_device *dev,
1217         struct t10_pr_registration *pr_reg)
1218 {
1219         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1220         struct t10_pr_registration *pr_res_holder;
1221         int ret = 0;
1222
1223         spin_lock(&dev->dev_reservation_lock);
1224         pr_res_holder = dev->dev_pr_res_holder;
1225         if (!pr_res_holder) {
1226                 spin_unlock(&dev->dev_reservation_lock);
1227                 return ret;
1228         }
1229         if (pr_res_holder == pr_reg) {
1230                 /*
1231                  * Perform an implict RELEASE if the registration that
1232                  * is being released is holding the reservation.
1233                  *
1234                  * From spc4r17, section 5.7.11.1:
1235                  *
1236                  * e) If the I_T nexus is the persistent reservation holder
1237                  *    and the persistent reservation is not an all registrants
1238                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1239                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1240                  *    service action with the SERVICE ACTION RESERVATION KEY
1241                  *    field set to zero (see 5.7.11.3).
1242                  */
1243                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1244                 ret = 1;
1245                 /*
1246                  * For 'All Registrants' reservation types, all existing
1247                  * registrations are still processed as reservation holders
1248                  * in core_scsi3_pr_seq_non_holder() after the initial
1249                  * reservation holder is implictly released here.
1250                  */
1251         } else if (pr_reg->pr_reg_all_tg_pt &&
1252                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1253                           pr_reg->pr_reg_nacl->initiatorname)) &&
1254                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1255                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1256                         " UNREGISTER while existing reservation with matching"
1257                         " key 0x%016Lx is present from another SCSI Initiator"
1258                         " Port\n", pr_reg->pr_res_key);
1259                 ret = -EPERM;
1260         }
1261         spin_unlock(&dev->dev_reservation_lock);
1262
1263         return ret;
1264 }
1265
1266 /*
1267  * Called with struct t10_reservation->registration_lock held.
1268  */
1269 static void __core_scsi3_free_registration(
1270         struct se_device *dev,
1271         struct t10_pr_registration *pr_reg,
1272         struct list_head *preempt_and_abort_list,
1273         int dec_holders)
1274 {
1275         struct target_core_fabric_ops *tfo =
1276                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1277         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1278         char i_buf[PR_REG_ISID_ID_LEN];
1279         int prf_isid;
1280
1281         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1282         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1283                                 PR_REG_ISID_ID_LEN);
1284
1285         pr_reg->pr_reg_deve->def_pr_registered = 0;
1286         pr_reg->pr_reg_deve->pr_res_key = 0;
1287         list_del(&pr_reg->pr_reg_list);
1288         /*
1289          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1290          * so call core_scsi3_put_pr_reg() to decrement our reference.
1291          */
1292         if (dec_holders)
1293                 core_scsi3_put_pr_reg(pr_reg);
1294         /*
1295          * Wait until all reference from any other I_T nexuses for this
1296          * *pr_reg have been released.  Because list_del() is called above,
1297          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1298          * count back to zero, and we release *pr_reg.
1299          */
1300         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1301                 spin_unlock(&pr_tmpl->registration_lock);
1302                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1303                                 tfo->get_fabric_name());
1304                 cpu_relax();
1305                 spin_lock(&pr_tmpl->registration_lock);
1306         }
1307
1308         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1309                 " Node: %s%s\n", tfo->get_fabric_name(),
1310                 pr_reg->pr_reg_nacl->initiatorname,
1311                 (prf_isid) ? &i_buf[0] : "");
1312         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1313                 " Port(s)\n", tfo->get_fabric_name(),
1314                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1315                 dev->transport->name);
1316         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1317                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1318                 pr_reg->pr_res_generation);
1319
1320         if (!preempt_and_abort_list) {
1321                 pr_reg->pr_reg_deve = NULL;
1322                 pr_reg->pr_reg_nacl = NULL;
1323                 kfree(pr_reg->pr_aptpl_buf);
1324                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1325                 return;
1326         }
1327         /*
1328          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1329          * are released once the ABORT_TASK_SET has completed..
1330          */
1331         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1332 }
1333
1334 void core_scsi3_free_pr_reg_from_nacl(
1335         struct se_device *dev,
1336         struct se_node_acl *nacl)
1337 {
1338         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1339         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1340         /*
1341          * If the passed se_node_acl matches the reservation holder,
1342          * release the reservation.
1343          */
1344         spin_lock(&dev->dev_reservation_lock);
1345         pr_res_holder = dev->dev_pr_res_holder;
1346         if ((pr_res_holder != NULL) &&
1347             (pr_res_holder->pr_reg_nacl == nacl))
1348                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1349         spin_unlock(&dev->dev_reservation_lock);
1350         /*
1351          * Release any registration associated with the struct se_node_acl.
1352          */
1353         spin_lock(&pr_tmpl->registration_lock);
1354         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1355                         &pr_tmpl->registration_list, pr_reg_list) {
1356
1357                 if (pr_reg->pr_reg_nacl != nacl)
1358                         continue;
1359
1360                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1361         }
1362         spin_unlock(&pr_tmpl->registration_lock);
1363 }
1364
1365 void core_scsi3_free_all_registrations(
1366         struct se_device *dev)
1367 {
1368         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1369         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1370
1371         spin_lock(&dev->dev_reservation_lock);
1372         pr_res_holder = dev->dev_pr_res_holder;
1373         if (pr_res_holder != NULL) {
1374                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1375                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1376                                 pr_res_holder, 0);
1377         }
1378         spin_unlock(&dev->dev_reservation_lock);
1379
1380         spin_lock(&pr_tmpl->registration_lock);
1381         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1382                         &pr_tmpl->registration_list, pr_reg_list) {
1383
1384                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1385         }
1386         spin_unlock(&pr_tmpl->registration_lock);
1387
1388         spin_lock(&pr_tmpl->aptpl_reg_lock);
1389         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1390                                 pr_reg_aptpl_list) {
1391                 list_del(&pr_reg->pr_reg_aptpl_list);
1392                 kfree(pr_reg->pr_aptpl_buf);
1393                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1394         }
1395         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1396 }
1397
1398 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1399 {
1400         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1401                         &tpg->tpg_group.cg_item);
1402 }
1403
1404 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1405 {
1406         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1407                         &tpg->tpg_group.cg_item);
1408
1409         atomic_dec(&tpg->tpg_pr_ref_count);
1410         smp_mb__after_atomic_dec();
1411 }
1412
1413 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1414 {
1415         struct se_portal_group *tpg = nacl->se_tpg;
1416
1417         if (nacl->dynamic_node_acl)
1418                 return 0;
1419
1420         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1421                         &nacl->acl_group.cg_item);
1422 }
1423
1424 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1425 {
1426         struct se_portal_group *tpg = nacl->se_tpg;
1427
1428         if (nacl->dynamic_node_acl) {
1429                 atomic_dec(&nacl->acl_pr_ref_count);
1430                 smp_mb__after_atomic_dec();
1431                 return;
1432         }
1433
1434         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1435                         &nacl->acl_group.cg_item);
1436
1437         atomic_dec(&nacl->acl_pr_ref_count);
1438         smp_mb__after_atomic_dec();
1439 }
1440
1441 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1442 {
1443         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1444         struct se_node_acl *nacl;
1445         struct se_portal_group *tpg;
1446         /*
1447          * For nacl->dynamic_node_acl=1
1448          */
1449         if (!lun_acl)
1450                 return 0;
1451
1452         nacl = lun_acl->se_lun_nacl;
1453         tpg = nacl->se_tpg;
1454
1455         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1456                         &lun_acl->se_lun_group.cg_item);
1457 }
1458
1459 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1460 {
1461         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1462         struct se_node_acl *nacl;
1463         struct se_portal_group *tpg;
1464         /*
1465          * For nacl->dynamic_node_acl=1
1466          */
1467         if (!lun_acl) {
1468                 atomic_dec(&se_deve->pr_ref_count);
1469                 smp_mb__after_atomic_dec();
1470                 return;
1471         }
1472         nacl = lun_acl->se_lun_nacl;
1473         tpg = nacl->se_tpg;
1474
1475         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1476                         &lun_acl->se_lun_group.cg_item);
1477
1478         atomic_dec(&se_deve->pr_ref_count);
1479         smp_mb__after_atomic_dec();
1480 }
1481
1482 static int core_scsi3_decode_spec_i_port(
1483         struct se_cmd *cmd,
1484         struct se_portal_group *tpg,
1485         unsigned char *l_isid,
1486         u64 sa_res_key,
1487         int all_tg_pt,
1488         int aptpl)
1489 {
1490         struct se_device *dev = cmd->se_dev;
1491         struct se_port *tmp_port;
1492         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1493         struct se_session *se_sess = cmd->se_sess;
1494         struct se_node_acl *dest_node_acl = NULL;
1495         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1496         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1497         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1498         LIST_HEAD(tid_dest_list);
1499         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1500         struct target_core_fabric_ops *tmp_tf_ops;
1501         unsigned char *buf;
1502         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1503         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1504         u32 tpdl, tid_len = 0;
1505         int ret, dest_local_nexus, prf_isid;
1506         u32 dest_rtpi = 0;
1507
1508         memset(dest_iport, 0, 64);
1509
1510         local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1511         /*
1512          * Allocate a struct pr_transport_id_holder and setup the
1513          * local_node_acl and local_se_deve pointers and add to
1514          * struct list_head tid_dest_list for add registration
1515          * processing in the loop of tid_dest_list below.
1516          */
1517         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1518         if (!tidh_new) {
1519                 pr_err("Unable to allocate tidh_new\n");
1520                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1521                 return -EINVAL;
1522         }
1523         INIT_LIST_HEAD(&tidh_new->dest_list);
1524         tidh_new->dest_tpg = tpg;
1525         tidh_new->dest_node_acl = se_sess->se_node_acl;
1526         tidh_new->dest_se_deve = local_se_deve;
1527
1528         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1529                                 se_sess->se_node_acl, local_se_deve, l_isid,
1530                                 sa_res_key, all_tg_pt, aptpl);
1531         if (!local_pr_reg) {
1532                 kfree(tidh_new);
1533                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1534                 return -ENOMEM;
1535         }
1536         tidh_new->dest_pr_reg = local_pr_reg;
1537         /*
1538          * The local I_T nexus does not hold any configfs dependances,
1539          * so we set tid_h->dest_local_nexus=1 to prevent the
1540          * configfs_undepend_item() calls in the tid_dest_list loops below.
1541          */
1542         tidh_new->dest_local_nexus = 1;
1543         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1544
1545         if (cmd->data_length < 28) {
1546                 pr_warn("SPC-PR: Received PR OUT parameter list"
1547                         " length too small: %u\n", cmd->data_length);
1548                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1549                 ret = -EINVAL;
1550                 goto out;
1551         }
1552
1553         buf = transport_kmap_data_sg(cmd);
1554         /*
1555          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1556          * first extract TransportID Parameter Data Length, and make sure
1557          * the value matches up to the SCSI expected data transfer length.
1558          */
1559         tpdl = (buf[24] & 0xff) << 24;
1560         tpdl |= (buf[25] & 0xff) << 16;
1561         tpdl |= (buf[26] & 0xff) << 8;
1562         tpdl |= buf[27] & 0xff;
1563
1564         if ((tpdl + 28) != cmd->data_length) {
1565                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1566                         " does not equal CDB data_length: %u\n", tpdl,
1567                         cmd->data_length);
1568                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1569                 ret = -EINVAL;
1570                 goto out;
1571         }
1572         /*
1573          * Start processing the received transport IDs using the
1574          * receiving I_T Nexus portal's fabric dependent methods to
1575          * obtain the SCSI Initiator Port/Device Identifiers.
1576          */
1577         ptr = &buf[28];
1578
1579         while (tpdl > 0) {
1580                 proto_ident = (ptr[0] & 0x0f);
1581                 dest_tpg = NULL;
1582
1583                 spin_lock(&dev->se_port_lock);
1584                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1585                         tmp_tpg = tmp_port->sep_tpg;
1586                         if (!tmp_tpg)
1587                                 continue;
1588                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1589                         if (!tmp_tf_ops)
1590                                 continue;
1591                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1592                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1593                                 continue;
1594                         /*
1595                          * Look for the matching proto_ident provided by
1596                          * the received TransportID
1597                          */
1598                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1599                         if (tmp_proto_ident != proto_ident)
1600                                 continue;
1601                         dest_rtpi = tmp_port->sep_rtpi;
1602
1603                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1604                                         tmp_tpg, (const char *)ptr, &tid_len,
1605                                         &iport_ptr);
1606                         if (!i_str)
1607                                 continue;
1608
1609                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1610                         smp_mb__after_atomic_inc();
1611                         spin_unlock(&dev->se_port_lock);
1612
1613                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1614                         if (ret != 0) {
1615                                 pr_err(" core_scsi3_tpg_depend_item()"
1616                                         " for tmp_tpg\n");
1617                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1618                                 smp_mb__after_atomic_dec();
1619                                 cmd->scsi_sense_reason =
1620                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1621                                 ret = -EINVAL;
1622                                 goto out;
1623                         }
1624                         /*
1625                          * Locate the destination initiator ACL to be registered
1626                          * from the decoded fabric module specific TransportID
1627                          * at *i_str.
1628                          */
1629                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1630                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1631                                                 tmp_tpg, i_str);
1632                         if (dest_node_acl) {
1633                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1634                                 smp_mb__after_atomic_inc();
1635                         }
1636                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1637
1638                         if (!dest_node_acl) {
1639                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1640                                 spin_lock(&dev->se_port_lock);
1641                                 continue;
1642                         }
1643
1644                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1645                         if (ret != 0) {
1646                                 pr_err("configfs_depend_item() failed"
1647                                         " for dest_node_acl->acl_group\n");
1648                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1649                                 smp_mb__after_atomic_dec();
1650                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1651                                 cmd->scsi_sense_reason =
1652                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1653                                 ret = -EINVAL;
1654                                 goto out;
1655                         }
1656
1657                         dest_tpg = tmp_tpg;
1658                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1659                                 " %s Port RTPI: %hu\n",
1660                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1661                                 dest_node_acl->initiatorname, dest_rtpi);
1662
1663                         spin_lock(&dev->se_port_lock);
1664                         break;
1665                 }
1666                 spin_unlock(&dev->se_port_lock);
1667
1668                 if (!dest_tpg) {
1669                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1670                                         " dest_tpg\n");
1671                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1672                         ret = -EINVAL;
1673                         goto out;
1674                 }
1675
1676                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1677                         " tid_len: %d for %s + %s\n",
1678                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1679                         tpdl, tid_len, i_str, iport_ptr);
1680
1681                 if (tid_len > tpdl) {
1682                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1683                                 " %u for Transport ID: %s\n", tid_len, ptr);
1684                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1685                         core_scsi3_tpg_undepend_item(dest_tpg);
1686                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1687                         ret = -EINVAL;
1688                         goto out;
1689                 }
1690                 /*
1691                  * Locate the desintation struct se_dev_entry pointer for matching
1692                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1693                  * Target Port.
1694                  */
1695                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1696                                         dest_rtpi);
1697                 if (!dest_se_deve) {
1698                         pr_err("Unable to locate %s dest_se_deve"
1699                                 " from destination RTPI: %hu\n",
1700                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1701                                 dest_rtpi);
1702
1703                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1704                         core_scsi3_tpg_undepend_item(dest_tpg);
1705                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1706                         ret = -EINVAL;
1707                         goto out;
1708                 }
1709
1710                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1711                 if (ret < 0) {
1712                         pr_err("core_scsi3_lunacl_depend_item()"
1713                                         " failed\n");
1714                         atomic_dec(&dest_se_deve->pr_ref_count);
1715                         smp_mb__after_atomic_dec();
1716                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1717                         core_scsi3_tpg_undepend_item(dest_tpg);
1718                         cmd->scsi_sense_reason =
1719                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1720                         ret = -EINVAL;
1721                         goto out;
1722                 }
1723
1724                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1725                         " dest_se_deve mapped_lun: %u\n",
1726                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1727                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1728
1729                 /*
1730                  * Skip any TransportIDs that already have a registration for
1731                  * this target port.
1732                  */
1733                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1734                                         iport_ptr);
1735                 if (pr_reg_e) {
1736                         core_scsi3_put_pr_reg(pr_reg_e);
1737                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1738                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1739                         core_scsi3_tpg_undepend_item(dest_tpg);
1740                         ptr += tid_len;
1741                         tpdl -= tid_len;
1742                         tid_len = 0;
1743                         continue;
1744                 }
1745                 /*
1746                  * Allocate a struct pr_transport_id_holder and setup
1747                  * the dest_node_acl and dest_se_deve pointers for the
1748                  * loop below.
1749                  */
1750                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1751                                 GFP_KERNEL);
1752                 if (!tidh_new) {
1753                         pr_err("Unable to allocate tidh_new\n");
1754                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1755                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1756                         core_scsi3_tpg_undepend_item(dest_tpg);
1757                         cmd->scsi_sense_reason =
1758                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1759                         ret = -ENOMEM;
1760                         goto out;
1761                 }
1762                 INIT_LIST_HEAD(&tidh_new->dest_list);
1763                 tidh_new->dest_tpg = dest_tpg;
1764                 tidh_new->dest_node_acl = dest_node_acl;
1765                 tidh_new->dest_se_deve = dest_se_deve;
1766
1767                 /*
1768                  * Allocate, but do NOT add the registration for the
1769                  * TransportID referenced SCSI Initiator port.  This
1770                  * done because of the following from spc4r17 in section
1771                  * 6.14.3 wrt SPEC_I_PT:
1772                  *
1773                  * "If a registration fails for any initiator port (e.g., if th
1774                  * logical unit does not have enough resources available to
1775                  * hold the registration information), no registrations shall be
1776                  * made, and the command shall be terminated with
1777                  * CHECK CONDITION status."
1778                  *
1779                  * That means we call __core_scsi3_alloc_registration() here,
1780                  * and then call __core_scsi3_add_registration() in the
1781                  * 2nd loop which will never fail.
1782                  */
1783                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1784                                 dest_node_acl, dest_se_deve, iport_ptr,
1785                                 sa_res_key, all_tg_pt, aptpl);
1786                 if (!dest_pr_reg) {
1787                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1788                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1789                         core_scsi3_tpg_undepend_item(dest_tpg);
1790                         kfree(tidh_new);
1791                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1792                         ret = -EINVAL;
1793                         goto out;
1794                 }
1795                 tidh_new->dest_pr_reg = dest_pr_reg;
1796                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1797
1798                 ptr += tid_len;
1799                 tpdl -= tid_len;
1800                 tid_len = 0;
1801
1802         }
1803
1804         transport_kunmap_data_sg(cmd);
1805
1806         /*
1807          * Go ahead and create a registrations from tid_dest_list for the
1808          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1809          * and dest_se_deve.
1810          *
1811          * The SA Reservation Key from the PROUT is set for the
1812          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1813          * means that the TransportID Initiator port will be
1814          * registered on all of the target ports in the SCSI target device
1815          * ALL_TG_PT=0 means the registration will only be for the
1816          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1817          * was received.
1818          */
1819         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1820                 dest_tpg = tidh->dest_tpg;
1821                 dest_node_acl = tidh->dest_node_acl;
1822                 dest_se_deve = tidh->dest_se_deve;
1823                 dest_pr_reg = tidh->dest_pr_reg;
1824                 dest_local_nexus = tidh->dest_local_nexus;
1825
1826                 list_del(&tidh->dest_list);
1827                 kfree(tidh);
1828
1829                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1830                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1831                                                 PR_REG_ISID_ID_LEN);
1832
1833                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1834                                         dest_pr_reg, 0, 0);
1835
1836                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1837                         " registered Transport ID for Node: %s%s Mapped LUN:"
1838                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1839                         dest_node_acl->initiatorname, (prf_isid) ?
1840                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1841
1842                 if (dest_local_nexus)
1843                         continue;
1844
1845                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1846                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1847                 core_scsi3_tpg_undepend_item(dest_tpg);
1848         }
1849
1850         return 0;
1851 out:
1852         transport_kunmap_data_sg(cmd);
1853         /*
1854          * For the failure case, release everything from tid_dest_list
1855          * including *dest_pr_reg and the configfs dependances..
1856          */
1857         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1858                 dest_tpg = tidh->dest_tpg;
1859                 dest_node_acl = tidh->dest_node_acl;
1860                 dest_se_deve = tidh->dest_se_deve;
1861                 dest_pr_reg = tidh->dest_pr_reg;
1862                 dest_local_nexus = tidh->dest_local_nexus;
1863
1864                 list_del(&tidh->dest_list);
1865                 kfree(tidh);
1866                 /*
1867                  * Release any extra ALL_TG_PT=1 registrations for
1868                  * the SPEC_I_PT=1 case.
1869                  */
1870                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1871                                 &dest_pr_reg->pr_reg_atp_list,
1872                                 pr_reg_atp_mem_list) {
1873                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1874                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1875                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1876                 }
1877
1878                 kfree(dest_pr_reg->pr_aptpl_buf);
1879                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1880
1881                 if (dest_local_nexus)
1882                         continue;
1883
1884                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1885                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1886                 core_scsi3_tpg_undepend_item(dest_tpg);
1887         }
1888         return ret;
1889 }
1890
1891 /*
1892  * Called with struct se_device->dev_reservation_lock held
1893  */
1894 static int __core_scsi3_update_aptpl_buf(
1895         struct se_device *dev,
1896         unsigned char *buf,
1897         u32 pr_aptpl_buf_len,
1898         int clear_aptpl_metadata)
1899 {
1900         struct se_lun *lun;
1901         struct se_portal_group *tpg;
1902         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1903         struct t10_pr_registration *pr_reg;
1904         unsigned char tmp[512], isid_buf[32];
1905         ssize_t len = 0;
1906         int reg_count = 0;
1907
1908         memset(buf, 0, pr_aptpl_buf_len);
1909         /*
1910          * Called to clear metadata once APTPL has been deactivated.
1911          */
1912         if (clear_aptpl_metadata) {
1913                 snprintf(buf, pr_aptpl_buf_len,
1914                                 "No Registrations or Reservations\n");
1915                 return 0;
1916         }
1917         /*
1918          * Walk the registration list..
1919          */
1920         spin_lock(&su_dev->t10_pr.registration_lock);
1921         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1922                         pr_reg_list) {
1923
1924                 tmp[0] = '\0';
1925                 isid_buf[0] = '\0';
1926                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1927                 lun = pr_reg->pr_reg_tg_pt_lun;
1928                 /*
1929                  * Write out any ISID value to APTPL metadata that was included
1930                  * in the original registration.
1931                  */
1932                 if (pr_reg->isid_present_at_reg)
1933                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1934                                         pr_reg->pr_reg_isid);
1935                 /*
1936                  * Include special metadata if the pr_reg matches the
1937                  * reservation holder.
1938                  */
1939                 if (dev->dev_pr_res_holder == pr_reg) {
1940                         snprintf(tmp, 512, "PR_REG_START: %d"
1941                                 "\ninitiator_fabric=%s\n"
1942                                 "initiator_node=%s\n%s"
1943                                 "sa_res_key=%llu\n"
1944                                 "res_holder=1\nres_type=%02x\n"
1945                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1946                                 "mapped_lun=%u\n", reg_count,
1947                                 tpg->se_tpg_tfo->get_fabric_name(),
1948                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1949                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1950                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1951                                 pr_reg->pr_res_mapped_lun);
1952                 } else {
1953                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1954                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1955                                 "sa_res_key=%llu\nres_holder=0\n"
1956                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1957                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1958                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1959                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1960                                 pr_reg->pr_res_mapped_lun);
1961                 }
1962
1963                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1964                         pr_err("Unable to update renaming"
1965                                 " APTPL metadata\n");
1966                         spin_unlock(&su_dev->t10_pr.registration_lock);
1967                         return -EMSGSIZE;
1968                 }
1969                 len += sprintf(buf+len, "%s", tmp);
1970
1971                 /*
1972                  * Include information about the associated SCSI target port.
1973                  */
1974                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1975                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1976                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1977                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1978                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1979                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1980
1981                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1982                         pr_err("Unable to update renaming"
1983                                 " APTPL metadata\n");
1984                         spin_unlock(&su_dev->t10_pr.registration_lock);
1985                         return -EMSGSIZE;
1986                 }
1987                 len += sprintf(buf+len, "%s", tmp);
1988                 reg_count++;
1989         }
1990         spin_unlock(&su_dev->t10_pr.registration_lock);
1991
1992         if (!reg_count)
1993                 len += sprintf(buf+len, "No Registrations or Reservations");
1994
1995         return 0;
1996 }
1997
1998 static int core_scsi3_update_aptpl_buf(
1999         struct se_device *dev,
2000         unsigned char *buf,
2001         u32 pr_aptpl_buf_len,
2002         int clear_aptpl_metadata)
2003 {
2004         int ret;
2005
2006         spin_lock(&dev->dev_reservation_lock);
2007         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2008                                 clear_aptpl_metadata);
2009         spin_unlock(&dev->dev_reservation_lock);
2010
2011         return ret;
2012 }
2013
2014 /*
2015  * Called with struct se_device->aptpl_file_mutex held
2016  */
2017 static int __core_scsi3_write_aptpl_to_file(
2018         struct se_device *dev,
2019         unsigned char *buf,
2020         u32 pr_aptpl_buf_len)
2021 {
2022         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
2023         struct file *file;
2024         struct iovec iov[1];
2025         mm_segment_t old_fs;
2026         int flags = O_RDWR | O_CREAT | O_TRUNC;
2027         char path[512];
2028         int ret;
2029
2030         memset(iov, 0, sizeof(struct iovec));
2031         memset(path, 0, 512);
2032
2033         if (strlen(&wwn->unit_serial[0]) >= 512) {
2034                 pr_err("WWN value for struct se_device does not fit"
2035                         " into path buffer\n");
2036                 return -EMSGSIZE;
2037         }
2038
2039         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2040         file = filp_open(path, flags, 0600);
2041         if (IS_ERR(file) || !file || !file->f_dentry) {
2042                 pr_err("filp_open(%s) for APTPL metadata"
2043                         " failed\n", path);
2044                 return IS_ERR(file) ? PTR_ERR(file) : -ENOENT;
2045         }
2046
2047         iov[0].iov_base = &buf[0];
2048         if (!pr_aptpl_buf_len)
2049                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2050         else
2051                 iov[0].iov_len = pr_aptpl_buf_len;
2052
2053         old_fs = get_fs();
2054         set_fs(get_ds());
2055         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2056         set_fs(old_fs);
2057
2058         if (ret < 0) {
2059                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2060                 filp_close(file, NULL);
2061                 return -EIO;
2062         }
2063         filp_close(file, NULL);
2064
2065         return 0;
2066 }
2067
2068 static int core_scsi3_update_and_write_aptpl(
2069         struct se_device *dev,
2070         unsigned char *in_buf,
2071         u32 in_pr_aptpl_buf_len)
2072 {
2073         unsigned char null_buf[64], *buf;
2074         u32 pr_aptpl_buf_len;
2075         int ret, clear_aptpl_metadata = 0;
2076         /*
2077          * Can be called with a NULL pointer from PROUT service action CLEAR
2078          */
2079         if (!in_buf) {
2080                 memset(null_buf, 0, 64);
2081                 buf = &null_buf[0];
2082                 /*
2083                  * This will clear the APTPL metadata to:
2084                  * "No Registrations or Reservations" status
2085                  */
2086                 pr_aptpl_buf_len = 64;
2087                 clear_aptpl_metadata = 1;
2088         } else {
2089                 buf = in_buf;
2090                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2091         }
2092
2093         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2094                                 clear_aptpl_metadata);
2095         if (ret != 0)
2096                 return ret;
2097         /*
2098          * __core_scsi3_write_aptpl_to_file() will call strlen()
2099          * on the passed buf to determine pr_aptpl_buf_len.
2100          */
2101         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2102         if (ret != 0)
2103                 return ret;
2104
2105         return ret;
2106 }
2107
2108 static int core_scsi3_emulate_pro_register(
2109         struct se_cmd *cmd,
2110         u64 res_key,
2111         u64 sa_res_key,
2112         int aptpl,
2113         int all_tg_pt,
2114         int spec_i_pt,
2115         int ignore_key)
2116 {
2117         struct se_session *se_sess = cmd->se_sess;
2118         struct se_device *dev = cmd->se_dev;
2119         struct se_dev_entry *se_deve;
2120         struct se_lun *se_lun = cmd->se_lun;
2121         struct se_portal_group *se_tpg;
2122         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2123         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2124         /* Used for APTPL metadata w/ UNREGISTER */
2125         unsigned char *pr_aptpl_buf = NULL;
2126         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2127         int pr_holder = 0, ret = 0, type;
2128
2129         if (!se_sess || !se_lun) {
2130                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2131                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2132                 return -EINVAL;
2133         }
2134         se_tpg = se_sess->se_tpg;
2135         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2136
2137         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2138                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2139                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2140                                 PR_REG_ISID_LEN);
2141                 isid_ptr = &isid_buf[0];
2142         }
2143         /*
2144          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2145          */
2146         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2147         if (!pr_reg_e) {
2148                 if (res_key) {
2149                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2150                                 " for SA REGISTER, returning CONFLICT\n");
2151                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2152                         return -EINVAL;
2153                 }
2154                 /*
2155                  * Do nothing but return GOOD status.
2156                  */
2157                 if (!sa_res_key)
2158                         return 0;
2159
2160                 if (!spec_i_pt) {
2161                         /*
2162                          * Perform the Service Action REGISTER on the Initiator
2163                          * Port Endpoint that the PRO was received from on the
2164                          * Logical Unit of the SCSI device server.
2165                          */
2166                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2167                                         se_sess->se_node_acl, se_deve, isid_ptr,
2168                                         sa_res_key, all_tg_pt, aptpl,
2169                                         ignore_key, 0);
2170                         if (ret != 0) {
2171                                 pr_err("Unable to allocate"
2172                                         " struct t10_pr_registration\n");
2173                                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2174                                 return -EINVAL;
2175                         }
2176                 } else {
2177                         /*
2178                          * Register both the Initiator port that received
2179                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2180                          * TransportID from Parameter list and loop through
2181                          * fabric dependent parameter list while calling
2182                          * logic from of core_scsi3_alloc_registration() for
2183                          * each TransportID provided SCSI Initiator Port/Device
2184                          */
2185                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2186                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2187                         if (ret != 0)
2188                                 return ret;
2189                 }
2190                 /*
2191                  * Nothing left to do for the APTPL=0 case.
2192                  */
2193                 if (!aptpl) {
2194                         pr_tmpl->pr_aptpl_active = 0;
2195                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2196                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2197                                         " REGISTER\n");
2198                         return 0;
2199                 }
2200                 /*
2201                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2202                  * update the APTPL metadata information using its
2203                  * preallocated *pr_reg->pr_aptpl_buf.
2204                  */
2205                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2206                                 se_sess->se_node_acl, se_sess);
2207
2208                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2209                                 &pr_reg->pr_aptpl_buf[0],
2210                                 pr_tmpl->pr_aptpl_buf_len);
2211                 if (!ret) {
2212                         pr_tmpl->pr_aptpl_active = 1;
2213                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2214                 }
2215
2216                 core_scsi3_put_pr_reg(pr_reg);
2217                 return ret;
2218         } else {
2219                 /*
2220                  * Locate the existing *pr_reg via struct se_node_acl pointers
2221                  */
2222                 pr_reg = pr_reg_e;
2223                 type = pr_reg->pr_res_type;
2224
2225                 if (!ignore_key) {
2226                         if (res_key != pr_reg->pr_res_key) {
2227                                 pr_err("SPC-3 PR REGISTER: Received"
2228                                         " res_key: 0x%016Lx does not match"
2229                                         " existing SA REGISTER res_key:"
2230                                         " 0x%016Lx\n", res_key,
2231                                         pr_reg->pr_res_key);
2232                                 core_scsi3_put_pr_reg(pr_reg);
2233                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2234                                 return -EINVAL;
2235                         }
2236                 }
2237                 if (spec_i_pt) {
2238                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2239                                 " set while sa_res_key=0\n");
2240                         core_scsi3_put_pr_reg(pr_reg);
2241                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2242                         return -EINVAL;
2243                 }
2244                 /*
2245                  * An existing ALL_TG_PT=1 registration being released
2246                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2247                  */
2248                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2249                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2250                                 " registration exists, but ALL_TG_PT=1 bit not"
2251                                 " present in received PROUT\n");
2252                         core_scsi3_put_pr_reg(pr_reg);
2253                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2254                         return -EINVAL;
2255                 }
2256                 /*
2257                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2258                  */
2259                 if (aptpl) {
2260                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2261                                                 GFP_KERNEL);
2262                         if (!pr_aptpl_buf) {
2263                                 pr_err("Unable to allocate"
2264                                         " pr_aptpl_buf\n");
2265                                 core_scsi3_put_pr_reg(pr_reg);
2266                                 cmd->scsi_sense_reason =
2267                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2268                                 return -EINVAL;
2269                         }
2270                 }
2271                 /*
2272                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2273                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2274                  * Nexus.
2275                  */
2276                 if (!sa_res_key) {
2277                         pr_holder = core_scsi3_check_implict_release(
2278                                         cmd->se_dev, pr_reg);
2279                         if (pr_holder < 0) {
2280                                 kfree(pr_aptpl_buf);
2281                                 core_scsi3_put_pr_reg(pr_reg);
2282                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2283                                 return -EINVAL;
2284                         }
2285
2286                         spin_lock(&pr_tmpl->registration_lock);
2287                         /*
2288                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2289                          * and matching pr_res_key.
2290                          */
2291                         if (pr_reg->pr_reg_all_tg_pt) {
2292                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2293                                                 &pr_tmpl->registration_list,
2294                                                 pr_reg_list) {
2295
2296                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2297                                                 continue;
2298
2299                                         if (pr_reg_p->pr_res_key != res_key)
2300                                                 continue;
2301
2302                                         if (pr_reg == pr_reg_p)
2303                                                 continue;
2304
2305                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2306                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2307                                                 continue;
2308
2309                                         __core_scsi3_free_registration(dev,
2310                                                         pr_reg_p, NULL, 0);
2311                                 }
2312                         }
2313                         /*
2314                          * Release the calling I_T Nexus registration now..
2315                          */
2316                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2317                                                         NULL, 1);
2318                         /*
2319                          * From spc4r17, section 5.7.11.3 Unregistering
2320                          *
2321                          * If the persistent reservation is a registrants only
2322                          * type, the device server shall establish a unit
2323                          * attention condition for the initiator port associated
2324                          * with every registered I_T nexus except for the I_T
2325                          * nexus on which the PERSISTENT RESERVE OUT command was
2326                          * received, with the additional sense code set to
2327                          * RESERVATIONS RELEASED.
2328                          */
2329                         if (pr_holder &&
2330                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2331                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2332                                 list_for_each_entry(pr_reg_p,
2333                                                 &pr_tmpl->registration_list,
2334                                                 pr_reg_list) {
2335
2336                                         core_scsi3_ua_allocate(
2337                                                 pr_reg_p->pr_reg_nacl,
2338                                                 pr_reg_p->pr_res_mapped_lun,
2339                                                 0x2A,
2340                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2341                                 }
2342                         }
2343                         spin_unlock(&pr_tmpl->registration_lock);
2344
2345                         if (!aptpl) {
2346                                 pr_tmpl->pr_aptpl_active = 0;
2347                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2348                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2349                                                 " for UNREGISTER\n");
2350                                 return 0;
2351                         }
2352
2353                         ret = core_scsi3_update_and_write_aptpl(dev,
2354                                         &pr_aptpl_buf[0],
2355                                         pr_tmpl->pr_aptpl_buf_len);
2356                         if (!ret) {
2357                                 pr_tmpl->pr_aptpl_active = 1;
2358                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2359                                                 " for UNREGISTER\n");
2360                         }
2361
2362                         kfree(pr_aptpl_buf);
2363                         return ret;
2364                 } else {
2365                         /*
2366                          * Increment PRgeneration counter for struct se_device"
2367                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2368                          * READ_KEYS service action.
2369                          */
2370                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2371                                                         cmd->se_dev);
2372                         pr_reg->pr_res_key = sa_res_key;
2373                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2374                                 " Key for %s to: 0x%016Lx PRgeneration:"
2375                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2376                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2377                                 pr_reg->pr_reg_nacl->initiatorname,
2378                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2379
2380                         if (!aptpl) {
2381                                 pr_tmpl->pr_aptpl_active = 0;
2382                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2383                                 core_scsi3_put_pr_reg(pr_reg);
2384                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2385                                                 " for REGISTER\n");
2386                                 return 0;
2387                         }
2388
2389                         ret = core_scsi3_update_and_write_aptpl(dev,
2390                                         &pr_aptpl_buf[0],
2391                                         pr_tmpl->pr_aptpl_buf_len);
2392                         if (!ret) {
2393                                 pr_tmpl->pr_aptpl_active = 1;
2394                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2395                                                 " for REGISTER\n");
2396                         }
2397
2398                         kfree(pr_aptpl_buf);
2399                         core_scsi3_put_pr_reg(pr_reg);
2400                 }
2401         }
2402         return 0;
2403 }
2404
2405 unsigned char *core_scsi3_pr_dump_type(int type)
2406 {
2407         switch (type) {
2408         case PR_TYPE_WRITE_EXCLUSIVE:
2409                 return "Write Exclusive Access";
2410         case PR_TYPE_EXCLUSIVE_ACCESS:
2411                 return "Exclusive Access";
2412         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2413                 return "Write Exclusive Access, Registrants Only";
2414         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2415                 return "Exclusive Access, Registrants Only";
2416         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2417                 return "Write Exclusive Access, All Registrants";
2418         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2419                 return "Exclusive Access, All Registrants";
2420         default:
2421                 break;
2422         }
2423
2424         return "Unknown SPC-3 PR Type";
2425 }
2426
2427 static int core_scsi3_pro_reserve(
2428         struct se_cmd *cmd,
2429         struct se_device *dev,
2430         int type,
2431         int scope,
2432         u64 res_key)
2433 {
2434         struct se_session *se_sess = cmd->se_sess;
2435         struct se_lun *se_lun = cmd->se_lun;
2436         struct t10_pr_registration *pr_reg, *pr_res_holder;
2437         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2438         char i_buf[PR_REG_ISID_ID_LEN];
2439         int ret, prf_isid;
2440
2441         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2442
2443         if (!se_sess || !se_lun) {
2444                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2445                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2446                 return -EINVAL;
2447         }
2448         /*
2449          * Locate the existing *pr_reg via struct se_node_acl pointers
2450          */
2451         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2452                                 se_sess);
2453         if (!pr_reg) {
2454                 pr_err("SPC-3 PR: Unable to locate"
2455                         " PR_REGISTERED *pr_reg for RESERVE\n");
2456                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2457                 return -EINVAL;
2458         }
2459         /*
2460          * From spc4r17 Section 5.7.9: Reserving:
2461          *
2462          * An application client creates a persistent reservation by issuing
2463          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2464          * a registered I_T nexus with the following parameters:
2465          *    a) RESERVATION KEY set to the value of the reservation key that is
2466          *       registered with the logical unit for the I_T nexus; and
2467          */
2468         if (res_key != pr_reg->pr_res_key) {
2469                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2470                         " does not match existing SA REGISTER res_key:"
2471                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2472                 core_scsi3_put_pr_reg(pr_reg);
2473                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2474                 return -EINVAL;
2475         }
2476         /*
2477          * From spc4r17 Section 5.7.9: Reserving:
2478          *
2479          * From above:
2480          *  b) TYPE field and SCOPE field set to the persistent reservation
2481          *     being created.
2482          *
2483          * Only one persistent reservation is allowed at a time per logical unit
2484          * and that persistent reservation has a scope of LU_SCOPE.
2485          */
2486         if (scope != PR_SCOPE_LU_SCOPE) {
2487                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2488                 core_scsi3_put_pr_reg(pr_reg);
2489                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2490                 return -EINVAL;
2491         }
2492         /*
2493          * See if we have an existing PR reservation holder pointer at
2494          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2495          * *pr_res_holder.
2496          */
2497         spin_lock(&dev->dev_reservation_lock);
2498         pr_res_holder = dev->dev_pr_res_holder;
2499         if (pr_res_holder) {
2500                 /*
2501                  * From spc4r17 Section 5.7.9: Reserving:
2502                  *
2503                  * If the device server receives a PERSISTENT RESERVE OUT
2504                  * command from an I_T nexus other than a persistent reservation
2505                  * holder (see 5.7.10) that attempts to create a persistent
2506                  * reservation when a persistent reservation already exists for
2507                  * the logical unit, then the command shall be completed with
2508                  * RESERVATION CONFLICT status.
2509                  */
2510                 if (pr_res_holder != pr_reg) {
2511                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2512                         pr_err("SPC-3 PR: Attempted RESERVE from"
2513                                 " [%s]: %s while reservation already held by"
2514                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2515                                 cmd->se_tfo->get_fabric_name(),
2516                                 se_sess->se_node_acl->initiatorname,
2517                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2518                                 pr_res_holder->pr_reg_nacl->initiatorname);
2519
2520                         spin_unlock(&dev->dev_reservation_lock);
2521                         core_scsi3_put_pr_reg(pr_reg);
2522                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2523                         return -EINVAL;
2524                 }
2525                 /*
2526                  * From spc4r17 Section 5.7.9: Reserving:
2527                  *
2528                  * If a persistent reservation holder attempts to modify the
2529                  * type or scope of an existing persistent reservation, the
2530                  * command shall be completed with RESERVATION CONFLICT status.
2531                  */
2532                 if ((pr_res_holder->pr_res_type != type) ||
2533                     (pr_res_holder->pr_res_scope != scope)) {
2534                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2535                         pr_err("SPC-3 PR: Attempted RESERVE from"
2536                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2537                                 " while reservation already held by [%s]: %s,"
2538                                 " returning RESERVATION_CONFLICT\n",
2539                                 cmd->se_tfo->get_fabric_name(),
2540                                 se_sess->se_node_acl->initiatorname,
2541                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2542                                 pr_res_holder->pr_reg_nacl->initiatorname);
2543
2544                         spin_unlock(&dev->dev_reservation_lock);
2545                         core_scsi3_put_pr_reg(pr_reg);
2546                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2547                         return -EINVAL;
2548                 }
2549                 /*
2550                  * From spc4r17 Section 5.7.9: Reserving:
2551                  *
2552                  * If the device server receives a PERSISTENT RESERVE OUT
2553                  * command with RESERVE service action where the TYPE field and
2554                  * the SCOPE field contain the same values as the existing type
2555                  * and scope from a persistent reservation holder, it shall not
2556                  * make any change to the existing persistent reservation and
2557                  * shall completethe command with GOOD status.
2558                  */
2559                 spin_unlock(&dev->dev_reservation_lock);
2560                 core_scsi3_put_pr_reg(pr_reg);
2561                 return 0;
2562         }
2563         /*
2564          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2565          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2566          */
2567         pr_reg->pr_res_scope = scope;
2568         pr_reg->pr_res_type = type;
2569         pr_reg->pr_res_holder = 1;
2570         dev->dev_pr_res_holder = pr_reg;
2571         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2572                                 PR_REG_ISID_ID_LEN);
2573
2574         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2575                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2576                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2577                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2578         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2579                         cmd->se_tfo->get_fabric_name(),
2580                         se_sess->se_node_acl->initiatorname,
2581                         (prf_isid) ? &i_buf[0] : "");
2582         spin_unlock(&dev->dev_reservation_lock);
2583
2584         if (pr_tmpl->pr_aptpl_active) {
2585                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2586                                 &pr_reg->pr_aptpl_buf[0],
2587                                 pr_tmpl->pr_aptpl_buf_len);
2588                 if (!ret)
2589                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2590                                         " for RESERVE\n");
2591         }
2592
2593         core_scsi3_put_pr_reg(pr_reg);
2594         return 0;
2595 }
2596
2597 static int core_scsi3_emulate_pro_reserve(
2598         struct se_cmd *cmd,
2599         int type,
2600         int scope,
2601         u64 res_key)
2602 {
2603         struct se_device *dev = cmd->se_dev;
2604         int ret = 0;
2605
2606         switch (type) {
2607         case PR_TYPE_WRITE_EXCLUSIVE:
2608         case PR_TYPE_EXCLUSIVE_ACCESS:
2609         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2610         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2611         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2612         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2613                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2614                 break;
2615         default:
2616                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2617                         " 0x%02x\n", type);
2618                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2619                 return -EINVAL;
2620         }
2621
2622         return ret;
2623 }
2624
2625 /*
2626  * Called with struct se_device->dev_reservation_lock held.
2627  */
2628 static void __core_scsi3_complete_pro_release(
2629         struct se_device *dev,
2630         struct se_node_acl *se_nacl,
2631         struct t10_pr_registration *pr_reg,
2632         int explict)
2633 {
2634         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2635         char i_buf[PR_REG_ISID_ID_LEN];
2636         int prf_isid;
2637
2638         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2639         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2640                                 PR_REG_ISID_ID_LEN);
2641         /*
2642          * Go ahead and release the current PR reservation holder.
2643          */
2644         dev->dev_pr_res_holder = NULL;
2645
2646         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2647                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2648                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2649                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2650                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2651         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2652                 tfo->get_fabric_name(), se_nacl->initiatorname,
2653                 (prf_isid) ? &i_buf[0] : "");
2654         /*
2655          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2656          */
2657         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2658 }
2659
2660 static int core_scsi3_emulate_pro_release(
2661         struct se_cmd *cmd,
2662         int type,
2663         int scope,
2664         u64 res_key)
2665 {
2666         struct se_device *dev = cmd->se_dev;
2667         struct se_session *se_sess = cmd->se_sess;
2668         struct se_lun *se_lun = cmd->se_lun;
2669         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2670         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2671         int ret, all_reg = 0;
2672
2673         if (!se_sess || !se_lun) {
2674                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2675                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2676                 return -EINVAL;
2677         }
2678         /*
2679          * Locate the existing *pr_reg via struct se_node_acl pointers
2680          */
2681         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2682         if (!pr_reg) {
2683                 pr_err("SPC-3 PR: Unable to locate"
2684                         " PR_REGISTERED *pr_reg for RELEASE\n");
2685                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2686                 return -EINVAL;
2687         }
2688         /*
2689          * From spc4r17 Section 5.7.11.2 Releasing:
2690          *
2691          * If there is no persistent reservation or in response to a persistent
2692          * reservation release request from a registered I_T nexus that is not a
2693          * persistent reservation holder (see 5.7.10), the device server shall
2694          * do the following:
2695          *
2696          *     a) Not release the persistent reservation, if any;
2697          *     b) Not remove any registrations; and
2698          *     c) Complete the command with GOOD status.
2699          */
2700         spin_lock(&dev->dev_reservation_lock);
2701         pr_res_holder = dev->dev_pr_res_holder;
2702         if (!pr_res_holder) {
2703                 /*
2704                  * No persistent reservation, return GOOD status.
2705                  */
2706                 spin_unlock(&dev->dev_reservation_lock);
2707                 core_scsi3_put_pr_reg(pr_reg);
2708                 return 0;
2709         }
2710         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2711             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2712                 all_reg = 1;
2713
2714         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2715                 /*
2716                  * Non 'All Registrants' PR Type cases..
2717                  * Release request from a registered I_T nexus that is not a
2718                  * persistent reservation holder. return GOOD status.
2719                  */
2720                 spin_unlock(&dev->dev_reservation_lock);
2721                 core_scsi3_put_pr_reg(pr_reg);
2722                 return 0;
2723         }
2724         /*
2725          * From spc4r17 Section 5.7.11.2 Releasing:
2726          *
2727          * Only the persistent reservation holder (see 5.7.10) is allowed to
2728          * release a persistent reservation.
2729          *
2730          * An application client releases the persistent reservation by issuing
2731          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2732          * an I_T nexus that is a persistent reservation holder with the
2733          * following parameters:
2734          *
2735          *     a) RESERVATION KEY field set to the value of the reservation key
2736          *        that is registered with the logical unit for the I_T nexus;
2737          */
2738         if (res_key != pr_reg->pr_res_key) {
2739                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2740                         " does not match existing SA REGISTER res_key:"
2741                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2742                 spin_unlock(&dev->dev_reservation_lock);
2743                 core_scsi3_put_pr_reg(pr_reg);
2744                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2745                 return -EINVAL;
2746         }
2747         /*
2748          * From spc4r17 Section 5.7.11.2 Releasing and above:
2749          *
2750          * b) TYPE field and SCOPE field set to match the persistent
2751          *    reservation being released.
2752          */
2753         if ((pr_res_holder->pr_res_type != type) ||
2754             (pr_res_holder->pr_res_scope != scope)) {
2755                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2756                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2757                         " reservation from [%s]: %s with different TYPE "
2758                         "and/or SCOPE  while reservation already held by"
2759                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2760                         cmd->se_tfo->get_fabric_name(),
2761                         se_sess->se_node_acl->initiatorname,
2762                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2763                         pr_res_holder->pr_reg_nacl->initiatorname);
2764
2765                 spin_unlock(&dev->dev_reservation_lock);
2766                 core_scsi3_put_pr_reg(pr_reg);
2767                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2768                 return -EINVAL;
2769         }
2770         /*
2771          * In response to a persistent reservation release request from the
2772          * persistent reservation holder the device server shall perform a
2773          * release by doing the following as an uninterrupted series of actions:
2774          * a) Release the persistent reservation;
2775          * b) Not remove any registration(s);
2776          * c) If the released persistent reservation is a registrants only type
2777          * or all registrants type persistent reservation,
2778          *    the device server shall establish a unit attention condition for
2779          *    the initiator port associated with every regis-
2780          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2781          *    RESERVE OUT command with RELEASE service action was received,
2782          *    with the additional sense code set to RESERVATIONS RELEASED; and
2783          * d) If the persistent reservation is of any other type, the device
2784          *    server shall not establish a unit attention condition.
2785          */
2786         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2787                         pr_reg, 1);
2788
2789         spin_unlock(&dev->dev_reservation_lock);
2790
2791         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2792             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2793             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2794             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2795                 /*
2796                  * If no UNIT ATTENTION conditions will be established for
2797                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2798                  * go ahead and check for APTPL=1 update+write below
2799                  */
2800                 goto write_aptpl;
2801         }
2802
2803         spin_lock(&pr_tmpl->registration_lock);
2804         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2805                         pr_reg_list) {
2806                 /*
2807                  * Do not establish a UNIT ATTENTION condition
2808                  * for the calling I_T Nexus
2809                  */
2810                 if (pr_reg_p == pr_reg)
2811                         continue;
2812
2813                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2814                                 pr_reg_p->pr_res_mapped_lun,
2815                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2816         }
2817         spin_unlock(&pr_tmpl->registration_lock);
2818
2819 write_aptpl:
2820         if (pr_tmpl->pr_aptpl_active) {
2821                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2822                                 &pr_reg->pr_aptpl_buf[0],
2823                                 pr_tmpl->pr_aptpl_buf_len);
2824                 if (!ret)
2825                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2826         }
2827
2828         core_scsi3_put_pr_reg(pr_reg);
2829         return 0;
2830 }
2831
2832 static int core_scsi3_emulate_pro_clear(
2833         struct se_cmd *cmd,
2834         u64 res_key)
2835 {
2836         struct se_device *dev = cmd->se_dev;
2837         struct se_node_acl *pr_reg_nacl;
2838         struct se_session *se_sess = cmd->se_sess;
2839         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2840         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2841         u32 pr_res_mapped_lun = 0;
2842         int calling_it_nexus = 0;
2843         /*
2844          * Locate the existing *pr_reg via struct se_node_acl pointers
2845          */
2846         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2847                         se_sess->se_node_acl, se_sess);
2848         if (!pr_reg_n) {
2849                 pr_err("SPC-3 PR: Unable to locate"
2850                         " PR_REGISTERED *pr_reg for CLEAR\n");
2851                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2852                 return -EINVAL;
2853         }
2854         /*
2855          * From spc4r17 section 5.7.11.6, Clearing:
2856          *
2857          * Any application client may release the persistent reservation and
2858          * remove all registrations from a device server by issuing a
2859          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2860          * registered I_T nexus with the following parameter:
2861          *
2862          *      a) RESERVATION KEY field set to the value of the reservation key
2863          *         that is registered with the logical unit for the I_T nexus.
2864          */
2865         if (res_key != pr_reg_n->pr_res_key) {
2866                 pr_err("SPC-3 PR REGISTER: Received"
2867                         " res_key: 0x%016Lx does not match"
2868                         " existing SA REGISTER res_key:"
2869                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2870                 core_scsi3_put_pr_reg(pr_reg_n);
2871                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2872                 return -EINVAL;
2873         }
2874         /*
2875          * a) Release the persistent reservation, if any;
2876          */
2877         spin_lock(&dev->dev_reservation_lock);
2878         pr_res_holder = dev->dev_pr_res_holder;
2879         if (pr_res_holder) {
2880                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2881                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2882                         pr_res_holder, 0);
2883         }
2884         spin_unlock(&dev->dev_reservation_lock);
2885         /*
2886          * b) Remove all registration(s) (see spc4r17 5.7.7);
2887          */
2888         spin_lock(&pr_tmpl->registration_lock);
2889         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2890                         &pr_tmpl->registration_list, pr_reg_list) {
2891
2892                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2893                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2894                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2895                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2896                                         calling_it_nexus);
2897                 /*
2898                  * e) Establish a unit attention condition for the initiator
2899                  *    port associated with every registered I_T nexus other
2900                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2901                  *    command with CLEAR service action was received, with the
2902                  *    additional sense code set to RESERVATIONS PREEMPTED.
2903                  */
2904                 if (!calling_it_nexus)
2905                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2906                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2907         }
2908         spin_unlock(&pr_tmpl->registration_lock);
2909
2910         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2911                 cmd->se_tfo->get_fabric_name());
2912
2913         if (pr_tmpl->pr_aptpl_active) {
2914                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2915                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2916                                 " for CLEAR\n");
2917         }
2918
2919         core_scsi3_pr_generation(dev);
2920         return 0;
2921 }
2922
2923 /*
2924  * Called with struct se_device->dev_reservation_lock held.
2925  */
2926 static void __core_scsi3_complete_pro_preempt(
2927         struct se_device *dev,
2928         struct t10_pr_registration *pr_reg,
2929         struct list_head *preempt_and_abort_list,
2930         int type,
2931         int scope,
2932         int abort)
2933 {
2934         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2935         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2936         char i_buf[PR_REG_ISID_ID_LEN];
2937         int prf_isid;
2938
2939         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2940         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2941                                 PR_REG_ISID_ID_LEN);
2942         /*
2943          * Do an implict RELEASE of the existing reservation.
2944          */
2945         if (dev->dev_pr_res_holder)
2946                 __core_scsi3_complete_pro_release(dev, nacl,
2947                                 dev->dev_pr_res_holder, 0);
2948
2949         dev->dev_pr_res_holder = pr_reg;
2950         pr_reg->pr_res_holder = 1;
2951         pr_reg->pr_res_type = type;
2952         pr_reg->pr_res_scope = scope;
2953
2954         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2955                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2956                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2957                 core_scsi3_pr_dump_type(type),
2958                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2959         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2960                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2961                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2962         /*
2963          * For PREEMPT_AND_ABORT, add the preempting reservation's
2964          * struct t10_pr_registration to the list that will be compared
2965          * against received CDBs..
2966          */
2967         if (preempt_and_abort_list)
2968                 list_add_tail(&pr_reg->pr_reg_abort_list,
2969                                 preempt_and_abort_list);
2970 }
2971
2972 static void core_scsi3_release_preempt_and_abort(
2973         struct list_head *preempt_and_abort_list,
2974         struct t10_pr_registration *pr_reg_holder)
2975 {
2976         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2977
2978         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2979                                 pr_reg_abort_list) {
2980
2981                 list_del(&pr_reg->pr_reg_abort_list);
2982                 if (pr_reg_holder == pr_reg)
2983                         continue;
2984                 if (pr_reg->pr_res_holder) {
2985                         pr_warn("pr_reg->pr_res_holder still set\n");
2986                         continue;
2987                 }
2988
2989                 pr_reg->pr_reg_deve = NULL;
2990                 pr_reg->pr_reg_nacl = NULL;
2991                 kfree(pr_reg->pr_aptpl_buf);
2992                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2993         }
2994 }
2995
2996 static int core_scsi3_pro_preempt(
2997         struct se_cmd *cmd,
2998         int type,
2999         int scope,
3000         u64 res_key,
3001         u64 sa_res_key,
3002         int abort)
3003 {
3004         struct se_device *dev = cmd->se_dev;
3005         struct se_node_acl *pr_reg_nacl;
3006         struct se_session *se_sess = cmd->se_sess;
3007         LIST_HEAD(preempt_and_abort_list);
3008         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
3009         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3010         u32 pr_res_mapped_lun = 0;
3011         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
3012         int prh_type = 0, prh_scope = 0, ret;
3013
3014         if (!se_sess) {
3015                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3016                 return -EINVAL;
3017         }
3018
3019         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3020                                 se_sess);
3021         if (!pr_reg_n) {
3022                 pr_err("SPC-3 PR: Unable to locate"
3023                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
3024                         (abort) ? "_AND_ABORT" : "");
3025                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3026                 return -EINVAL;
3027         }
3028         if (pr_reg_n->pr_res_key != res_key) {
3029                 core_scsi3_put_pr_reg(pr_reg_n);
3030                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3031                 return -EINVAL;
3032         }
3033         if (scope != PR_SCOPE_LU_SCOPE) {
3034                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
3035                 core_scsi3_put_pr_reg(pr_reg_n);
3036                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3037                 return -EINVAL;
3038         }
3039
3040         spin_lock(&dev->dev_reservation_lock);
3041         pr_res_holder = dev->dev_pr_res_holder;
3042         if (pr_res_holder &&
3043            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3044             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3045                 all_reg = 1;
3046
3047         if (!all_reg && !sa_res_key) {
3048                 spin_unlock(&dev->dev_reservation_lock);
3049                 core_scsi3_put_pr_reg(pr_reg_n);
3050                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3051                 return -EINVAL;
3052         }
3053         /*
3054          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3055          *
3056          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3057          * persistent reservation holder or there is no persistent reservation
3058          * holder (i.e., there is no persistent reservation), then the device
3059          * server shall perform a preempt by doing the following in an
3060          * uninterrupted series of actions. (See below..)
3061          */
3062         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3063                 /*
3064                  * No existing or SA Reservation Key matching reservations..
3065                  *
3066                  * PROUT SA PREEMPT with All Registrant type reservations are
3067                  * allowed to be processed without a matching SA Reservation Key
3068                  */
3069                 spin_lock(&pr_tmpl->registration_lock);
3070                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3071                                 &pr_tmpl->registration_list, pr_reg_list) {
3072                         /*
3073                          * Removing of registrations in non all registrants
3074                          * type reservations without a matching SA reservation
3075                          * key.
3076                          *
3077                          * a) Remove the registrations for all I_T nexuses
3078                          *    specified by the SERVICE ACTION RESERVATION KEY
3079                          *    field;
3080                          * b) Ignore the contents of the SCOPE and TYPE fields;
3081                          * c) Process tasks as defined in 5.7.1; and
3082                          * d) Establish a unit attention condition for the
3083                          *    initiator port associated with every I_T nexus
3084                          *    that lost its registration other than the I_T
3085                          *    nexus on which the PERSISTENT RESERVE OUT command
3086                          *    was received, with the additional sense code set
3087                          *    to REGISTRATIONS PREEMPTED.
3088                          */
3089                         if (!all_reg) {
3090                                 if (pr_reg->pr_res_key != sa_res_key)
3091                                         continue;
3092
3093                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3094                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3095                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3096                                 __core_scsi3_free_registration(dev, pr_reg,
3097                                         (abort) ? &preempt_and_abort_list :
3098                                                 NULL, calling_it_nexus);
3099                                 released_regs++;
3100                         } else {
3101                                 /*
3102                                  * Case for any existing all registrants type
3103                                  * reservation, follow logic in spc4r17 section
3104                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3105                                  *
3106                                  * For a ZERO SA Reservation key, release
3107                                  * all other registrations and do an implict
3108                                  * release of active persistent reservation.
3109                                  *
3110                                  * For a non-ZERO SA Reservation key, only
3111                                  * release the matching reservation key from
3112                                  * registrations.
3113                                  */
3114                                 if ((sa_res_key) &&
3115                                      (pr_reg->pr_res_key != sa_res_key))
3116                                         continue;
3117
3118                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3119                                 if (calling_it_nexus)
3120                                         continue;
3121
3122                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3123                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3124                                 __core_scsi3_free_registration(dev, pr_reg,
3125                                         (abort) ? &preempt_and_abort_list :
3126                                                 NULL, 0);
3127                                 released_regs++;
3128                         }
3129                         if (!calling_it_nexus)
3130                                 core_scsi3_ua_allocate(pr_reg_nacl,
3131                                         pr_res_mapped_lun, 0x2A,
3132                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3133                 }
3134                 spin_unlock(&pr_tmpl->registration_lock);
3135                 /*
3136                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3137                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3138                  * RESERVATION KEY field to a value that does not match any
3139                  * registered reservation key, then the device server shall
3140                  * complete the command with RESERVATION CONFLICT status.
3141                  */
3142                 if (!released_regs) {
3143                         spin_unlock(&dev->dev_reservation_lock);
3144                         core_scsi3_put_pr_reg(pr_reg_n);
3145                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3146                         return -EINVAL;
3147                 }
3148                 /*
3149                  * For an existing all registrants type reservation
3150                  * with a zero SA rservation key, preempt the existing
3151                  * reservation with the new PR type and scope.
3152                  */
3153                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3154                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3155                                 (abort) ? &preempt_and_abort_list : NULL,
3156                                 type, scope, abort);
3157
3158                         if (abort)
3159                                 core_scsi3_release_preempt_and_abort(
3160                                         &preempt_and_abort_list, pr_reg_n);
3161                 }
3162                 spin_unlock(&dev->dev_reservation_lock);
3163
3164                 if (pr_tmpl->pr_aptpl_active) {
3165                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3166                                         &pr_reg_n->pr_aptpl_buf[0],
3167                                         pr_tmpl->pr_aptpl_buf_len);
3168                         if (!ret)
3169                                 pr_debug("SPC-3 PR: Updated APTPL"
3170                                         " metadata for  PREEMPT%s\n", (abort) ?
3171                                         "_AND_ABORT" : "");
3172                 }
3173
3174                 core_scsi3_put_pr_reg(pr_reg_n);
3175                 core_scsi3_pr_generation(cmd->se_dev);
3176                 return 0;
3177         }
3178         /*
3179          * The PREEMPTing SA reservation key matches that of the
3180          * existing persistent reservation, first, we check if
3181          * we are preempting our own reservation.
3182          * From spc4r17, section 5.7.11.4.3 Preempting
3183          * persistent reservations and registration handling
3184          *
3185          * If an all registrants persistent reservation is not
3186          * present, it is not an error for the persistent
3187          * reservation holder to preempt itself (i.e., a
3188          * PERSISTENT RESERVE OUT with a PREEMPT service action
3189          * or a PREEMPT AND ABORT service action with the
3190          * SERVICE ACTION RESERVATION KEY value equal to the
3191          * persistent reservation holder's reservation key that
3192          * is received from the persistent reservation holder).
3193          * In that case, the device server shall establish the
3194          * new persistent reservation and maintain the
3195          * registration.
3196          */
3197         prh_type = pr_res_holder->pr_res_type;
3198         prh_scope = pr_res_holder->pr_res_scope;
3199         /*
3200          * If the SERVICE ACTION RESERVATION KEY field identifies a
3201          * persistent reservation holder (see 5.7.10), the device
3202          * server shall perform a preempt by doing the following as
3203          * an uninterrupted series of actions:
3204          *
3205          * a) Release the persistent reservation for the holder
3206          *    identified by the SERVICE ACTION RESERVATION KEY field;
3207          */
3208         if (pr_reg_n != pr_res_holder)
3209                 __core_scsi3_complete_pro_release(dev,
3210                                 pr_res_holder->pr_reg_nacl,
3211                                 dev->dev_pr_res_holder, 0);
3212         /*
3213          * b) Remove the registrations for all I_T nexuses identified
3214          *    by the SERVICE ACTION RESERVATION KEY field, except the
3215          *    I_T nexus that is being used for the PERSISTENT RESERVE
3216          *    OUT command. If an all registrants persistent reservation
3217          *    is present and the SERVICE ACTION RESERVATION KEY field
3218          *    is set to zero, then all registrations shall be removed
3219          *    except for that of the I_T nexus that is being used for
3220          *    the PERSISTENT RESERVE OUT command;
3221          */
3222         spin_lock(&pr_tmpl->registration_lock);
3223         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3224                         &pr_tmpl->registration_list, pr_reg_list) {
3225
3226                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3227                 if (calling_it_nexus)
3228                         continue;
3229
3230                 if (pr_reg->pr_res_key != sa_res_key)
3231                         continue;
3232
3233                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3234                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3235                 __core_scsi3_free_registration(dev, pr_reg,
3236                                 (abort) ? &preempt_and_abort_list : NULL,
3237                                 calling_it_nexus);
3238                 /*
3239                  * e) Establish a unit attention condition for the initiator
3240                  *    port associated with every I_T nexus that lost its
3241                  *    persistent reservation and/or registration, with the
3242                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3243                  */
3244                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3245                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3246         }
3247         spin_unlock(&pr_tmpl->registration_lock);
3248         /*
3249          * c) Establish a persistent reservation for the preempting
3250          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3251          */
3252         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3253                         (abort) ? &preempt_and_abort_list : NULL,
3254                         type, scope, abort);
3255         /*
3256          * d) Process tasks as defined in 5.7.1;
3257          * e) See above..
3258          * f) If the type or scope has changed, then for every I_T nexus
3259          *    whose reservation key was not removed, except for the I_T
3260          *    nexus on which the PERSISTENT RESERVE OUT command was
3261          *    received, the device server shall establish a unit
3262          *    attention condition for the initiator port associated with
3263          *    that I_T nexus, with the additional sense code set to
3264          *    RESERVATIONS RELEASED. If the type or scope have not
3265          *    changed, then no unit attention condition(s) shall be
3266          *    established for this reason.
3267          */
3268         if ((prh_type != type) || (prh_scope != scope)) {
3269                 spin_lock(&pr_tmpl->registration_lock);
3270                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3271                                 &pr_tmpl->registration_list, pr_reg_list) {
3272
3273                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3274                         if (calling_it_nexus)
3275                                 continue;
3276
3277                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3278                                         pr_reg->pr_res_mapped_lun, 0x2A,
3279                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3280                 }
3281                 spin_unlock(&pr_tmpl->registration_lock);
3282         }
3283         spin_unlock(&dev->dev_reservation_lock);
3284         /*
3285          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3286          * All received CDBs for the matching existing reservation and
3287          * registrations undergo ABORT_TASK logic.
3288          *
3289          * From there, core_scsi3_release_preempt_and_abort() will
3290          * release every registration in the list (which have already
3291          * been removed from the primary pr_reg list), except the
3292          * new persistent reservation holder, the calling Initiator Port.
3293          */
3294         if (abort) {
3295                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3296                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3297                                                 pr_reg_n);
3298         }
3299
3300         if (pr_tmpl->pr_aptpl_active) {
3301                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3302                                 &pr_reg_n->pr_aptpl_buf[0],
3303                                 pr_tmpl->pr_aptpl_buf_len);
3304                 if (!ret)
3305                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3306                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3307         }
3308
3309         core_scsi3_put_pr_reg(pr_reg_n);
3310         core_scsi3_pr_generation(cmd->se_dev);
3311         return 0;
3312 }
3313
3314 static int core_scsi3_emulate_pro_preempt(
3315         struct se_cmd *cmd,
3316         int type,
3317         int scope,
3318         u64 res_key,
3319         u64 sa_res_key,
3320         int abort)
3321 {
3322         int ret = 0;
3323
3324         switch (type) {
3325         case PR_TYPE_WRITE_EXCLUSIVE:
3326         case PR_TYPE_EXCLUSIVE_ACCESS:
3327         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3328         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3329         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3330         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3331                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3332                                 res_key, sa_res_key, abort);
3333                 break;
3334         default:
3335                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3336                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3337                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3338                 return -EINVAL;
3339         }
3340
3341         return ret;
3342 }
3343
3344
3345 static int core_scsi3_emulate_pro_register_and_move(
3346         struct se_cmd *cmd,
3347         u64 res_key,
3348         u64 sa_res_key,
3349         int aptpl,
3350         int unreg)
3351 {
3352         struct se_session *se_sess = cmd->se_sess;
3353         struct se_device *dev = cmd->se_dev;
3354         struct se_dev_entry *dest_se_deve = NULL;
3355         struct se_lun *se_lun = cmd->se_lun;
3356         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3357         struct se_port *se_port;
3358         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3359         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3360         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3361         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3362         unsigned char *buf;
3363         unsigned char *initiator_str;
3364         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3365         u32 tid_len, tmp_tid_len;
3366         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3367         unsigned short rtpi;
3368         unsigned char proto_ident;
3369
3370         if (!se_sess || !se_lun) {
3371                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3372                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3373                 return -EINVAL;
3374         }
3375         memset(dest_iport, 0, 64);
3376         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3377         se_tpg = se_sess->se_tpg;
3378         tf_ops = se_tpg->se_tpg_tfo;
3379         /*
3380          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3381          *      Register behaviors for a REGISTER AND MOVE service action
3382          *
3383          * Locate the existing *pr_reg via struct se_node_acl pointers
3384          */
3385         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3386                                 se_sess);
3387         if (!pr_reg) {
3388                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3389                         " *pr_reg for REGISTER_AND_MOVE\n");
3390                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3391                 return -EINVAL;
3392         }
3393         /*
3394          * The provided reservation key much match the existing reservation key
3395          * provided during this initiator's I_T nexus registration.
3396          */
3397         if (res_key != pr_reg->pr_res_key) {
3398                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3399                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3400                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3401                 core_scsi3_put_pr_reg(pr_reg);
3402                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3403                 return -EINVAL;
3404         }
3405         /*
3406          * The service active reservation key needs to be non zero
3407          */
3408         if (!sa_res_key) {
3409                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3410                         " sa_res_key\n");
3411                 core_scsi3_put_pr_reg(pr_reg);
3412                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3413                 return -EINVAL;
3414         }
3415
3416         /*
3417          * Determine the Relative Target Port Identifier where the reservation
3418          * will be moved to for the TransportID containing SCSI initiator WWN
3419          * information.
3420          */
3421         buf = transport_kmap_data_sg(cmd);
3422         rtpi = (buf[18] & 0xff) << 8;
3423         rtpi |= buf[19] & 0xff;
3424         tid_len = (buf[20] & 0xff) << 24;
3425         tid_len |= (buf[21] & 0xff) << 16;
3426         tid_len |= (buf[22] & 0xff) << 8;
3427         tid_len |= buf[23] & 0xff;
3428         transport_kunmap_data_sg(cmd);
3429         buf = NULL;
3430
3431         if ((tid_len + 24) != cmd->data_length) {
3432                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3433                         " does not equal CDB data_length: %u\n", tid_len,
3434                         cmd->data_length);
3435                 core_scsi3_put_pr_reg(pr_reg);
3436                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3437                 return -EINVAL;
3438         }
3439
3440         spin_lock(&dev->se_port_lock);
3441         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3442                 if (se_port->sep_rtpi != rtpi)
3443                         continue;
3444                 dest_se_tpg = se_port->sep_tpg;
3445                 if (!dest_se_tpg)
3446                         continue;
3447                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3448                 if (!dest_tf_ops)
3449                         continue;
3450
3451                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3452                 smp_mb__after_atomic_inc();
3453                 spin_unlock(&dev->se_port_lock);
3454
3455                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3456                 if (ret != 0) {
3457                         pr_err("core_scsi3_tpg_depend_item() failed"
3458                                 " for dest_se_tpg\n");
3459                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3460                         smp_mb__after_atomic_dec();
3461                         core_scsi3_put_pr_reg(pr_reg);
3462                         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3463                         return -EINVAL;
3464                 }
3465
3466                 spin_lock(&dev->se_port_lock);
3467                 break;
3468         }
3469         spin_unlock(&dev->se_port_lock);
3470
3471         if (!dest_se_tpg || !dest_tf_ops) {
3472                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3473                         " fabric ops from Relative Target Port Identifier:"
3474                         " %hu\n", rtpi);
3475                 core_scsi3_put_pr_reg(pr_reg);
3476                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3477                 return -EINVAL;
3478         }
3479
3480         buf = transport_kmap_data_sg(cmd);
3481         proto_ident = (buf[24] & 0x0f);
3482
3483         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3484                         " 0x%02x\n", proto_ident);
3485
3486         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3487                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3488                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3489                         " from fabric: %s\n", proto_ident,
3490                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3491                         dest_tf_ops->get_fabric_name());
3492                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3493                 ret = -EINVAL;
3494                 goto out;
3495         }
3496         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3497                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3498                         " containg a valid tpg_parse_pr_out_transport_id"
3499                         " function pointer\n");
3500                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3501                 ret = -EINVAL;
3502                 goto out;
3503         }
3504         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3505                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3506         if (!initiator_str) {
3507                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3508                         " initiator_str from Transport ID\n");
3509                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3510                 ret = -EINVAL;
3511                 goto out;
3512         }
3513
3514         transport_kunmap_data_sg(cmd);
3515         buf = NULL;
3516
3517         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3518                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3519                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3520                 iport_ptr : "");
3521         /*
3522          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3523          * action specifies a TransportID that is the same as the initiator port
3524          * of the I_T nexus for the command received, then the command shall
3525          * be terminated with CHECK CONDITION status, with the sense key set to
3526          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3527          * IN PARAMETER LIST.
3528          */
3529         pr_reg_nacl = pr_reg->pr_reg_nacl;
3530         matching_iname = (!strcmp(initiator_str,
3531                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3532         if (!matching_iname)
3533                 goto after_iport_check;
3534
3535         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3536                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3537                         " matches: %s on received I_T Nexus\n", initiator_str,
3538                         pr_reg_nacl->initiatorname);
3539                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3540                 ret = -EINVAL;
3541                 goto out;
3542         }
3543         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3544                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3545                         " matches: %s %s on received I_T Nexus\n",
3546                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3547                         pr_reg->pr_reg_isid);
3548                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3549                 ret = -EINVAL;
3550                 goto out;
3551         }
3552 after_iport_check:
3553         /*
3554          * Locate the destination struct se_node_acl from the received Transport ID
3555          */
3556         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3557         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3558                                 initiator_str);
3559         if (dest_node_acl) {
3560                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3561                 smp_mb__after_atomic_inc();
3562         }
3563         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3564
3565         if (!dest_node_acl) {
3566                 pr_err("Unable to locate %s dest_node_acl for"
3567                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3568                         initiator_str);
3569                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3570                 ret = -EINVAL;
3571                 goto out;
3572         }
3573         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3574         if (ret != 0) {
3575                 pr_err("core_scsi3_nodeacl_depend_item() for"
3576                         " dest_node_acl\n");
3577                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3578                 smp_mb__after_atomic_dec();
3579                 dest_node_acl = NULL;
3580                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3581                 ret = -EINVAL;
3582                 goto out;
3583         }
3584
3585         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3586                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3587                 dest_node_acl->initiatorname);
3588
3589         /*
3590          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3591          * PORT IDENTIFIER.
3592          */
3593         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3594         if (!dest_se_deve) {
3595                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3596                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3597                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3598                 ret = -EINVAL;
3599                 goto out;
3600         }
3601
3602         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3603         if (ret < 0) {
3604                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3605                 atomic_dec(&dest_se_deve->pr_ref_count);
3606                 smp_mb__after_atomic_dec();
3607                 dest_se_deve = NULL;
3608                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3609                 ret = -EINVAL;
3610                 goto out;
3611         }
3612
3613         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3614                 " ACL for dest_se_deve->mapped_lun: %u\n",
3615                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3616                 dest_se_deve->mapped_lun);
3617
3618         /*
3619          * A persistent reservation needs to already existing in order to
3620          * successfully complete the REGISTER_AND_MOVE service action..
3621          */
3622         spin_lock(&dev->dev_reservation_lock);
3623         pr_res_holder = dev->dev_pr_res_holder;
3624         if (!pr_res_holder) {
3625                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3626                         " currently held\n");
3627                 spin_unlock(&dev->dev_reservation_lock);
3628                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3629                 ret = -EINVAL;
3630                 goto out;
3631         }
3632         /*
3633          * The received on I_T Nexus must be the reservation holder.
3634          *
3635          * From spc4r17 section 5.7.8  Table 50 --
3636          *      Register behaviors for a REGISTER AND MOVE service action
3637          */
3638         if (pr_res_holder != pr_reg) {
3639                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3640                         " Nexus is not reservation holder\n");
3641                 spin_unlock(&dev->dev_reservation_lock);
3642                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3643                 ret = -EINVAL;
3644                 goto out;
3645         }
3646         /*
3647          * From spc4r17 section 5.7.8: registering and moving reservation
3648          *
3649          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3650          * action is received and the established persistent reservation is a
3651          * Write Exclusive - All Registrants type or Exclusive Access -
3652          * All Registrants type reservation, then the command shall be completed
3653          * with RESERVATION CONFLICT status.
3654          */
3655         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3656             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3657                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3658                         " reservation for type: %s\n",
3659                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3660                 spin_unlock(&dev->dev_reservation_lock);
3661                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3662                 ret = -EINVAL;
3663                 goto out;
3664         }
3665         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3666         /*
3667          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3668          */
3669         type = pr_res_holder->pr_res_type;
3670         scope = pr_res_holder->pr_res_type;
3671         /*
3672          * c) Associate the reservation key specified in the SERVICE ACTION
3673          *    RESERVATION KEY field with the I_T nexus specified as the
3674          *    destination of the register and move, where:
3675          *    A) The I_T nexus is specified by the TransportID and the
3676          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3677          *    B) Regardless of the TransportID format used, the association for
3678          *       the initiator port is based on either the initiator port name
3679          *       (see 3.1.71) on SCSI transport protocols where port names are
3680          *       required or the initiator port identifier (see 3.1.70) on SCSI
3681          *       transport protocols where port names are not required;
3682          * d) Register the reservation key specified in the SERVICE ACTION
3683          *    RESERVATION KEY field;
3684          * e) Retain the reservation key specified in the SERVICE ACTION
3685          *    RESERVATION KEY field and associated information;
3686          *
3687          * Also, It is not an error for a REGISTER AND MOVE service action to
3688          * register an I_T nexus that is already registered with the same
3689          * reservation key or a different reservation key.
3690          */
3691         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3692                                         iport_ptr);
3693         if (!dest_pr_reg) {
3694                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3695                                 dest_node_acl, dest_se_deve, iport_ptr,
3696                                 sa_res_key, 0, aptpl, 2, 1);
3697                 if (ret != 0) {
3698                         spin_unlock(&dev->dev_reservation_lock);
3699                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3700                         ret = -EINVAL;
3701                         goto out;
3702                 }
3703                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3704                                                 iport_ptr);
3705                 new_reg = 1;
3706         }
3707         /*
3708          * f) Release the persistent reservation for the persistent reservation
3709          *    holder (i.e., the I_T nexus on which the
3710          */
3711         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3712                         dev->dev_pr_res_holder, 0);
3713         /*
3714          * g) Move the persistent reservation to the specified I_T nexus using
3715          *    the same scope and type as the persistent reservation released in
3716          *    item f); and
3717          */
3718         dev->dev_pr_res_holder = dest_pr_reg;
3719         dest_pr_reg->pr_res_holder = 1;
3720         dest_pr_reg->pr_res_type = type;
3721         pr_reg->pr_res_scope = scope;
3722         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3723                                 PR_REG_ISID_ID_LEN);
3724         /*
3725          * Increment PRGeneration for existing registrations..
3726          */
3727         if (!new_reg)
3728                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3729         spin_unlock(&dev->dev_reservation_lock);
3730
3731         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3732                 " created new reservation holder TYPE: %s on object RTPI:"
3733                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3734                 core_scsi3_pr_dump_type(type), rtpi,
3735                 dest_pr_reg->pr_res_generation);
3736         pr_debug("SPC-3 PR Successfully moved reservation from"
3737                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3738                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3739                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3740                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3741                 iport_ptr : "");
3742         /*
3743          * It is now safe to release configfs group dependencies for destination
3744          * of Transport ID Initiator Device/Port Identifier
3745          */
3746         core_scsi3_lunacl_undepend_item(dest_se_deve);
3747         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3748         core_scsi3_tpg_undepend_item(dest_se_tpg);
3749         /*
3750          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3751          * nexus on which PERSISTENT RESERVE OUT command was received.
3752          */
3753         if (unreg) {
3754                 spin_lock(&pr_tmpl->registration_lock);
3755                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3756                 spin_unlock(&pr_tmpl->registration_lock);
3757         } else
3758                 core_scsi3_put_pr_reg(pr_reg);
3759
3760         /*
3761          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3762          * write out the updated metadata to struct file for this SCSI device.
3763          */
3764         if (!aptpl) {
3765                 pr_tmpl->pr_aptpl_active = 0;
3766                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3767                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3768                                 " REGISTER_AND_MOVE\n");
3769         } else {
3770                 pr_tmpl->pr_aptpl_active = 1;
3771                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3772                                 &dest_pr_reg->pr_aptpl_buf[0],
3773                                 pr_tmpl->pr_aptpl_buf_len);
3774                 if (!ret)
3775                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3776                                         " REGISTER_AND_MOVE\n");
3777         }
3778
3779         transport_kunmap_data_sg(cmd);
3780
3781         core_scsi3_put_pr_reg(dest_pr_reg);
3782         return 0;
3783 out:
3784         if (buf)
3785                 transport_kunmap_data_sg(cmd);
3786         if (dest_se_deve)
3787                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3788         if (dest_node_acl)
3789                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3790         core_scsi3_tpg_undepend_item(dest_se_tpg);
3791         core_scsi3_put_pr_reg(pr_reg);
3792         return ret;
3793 }
3794
3795 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3796 {
3797         unsigned int __v1, __v2;
3798
3799         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3800         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3801
3802         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3803 }
3804
3805 /*
3806  * See spc4r17 section 6.14 Table 170
3807  */
3808 int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3809 {
3810         unsigned char *cdb = &cmd->t_task_cdb[0];
3811         unsigned char *buf;
3812         u64 res_key, sa_res_key;
3813         int sa, scope, type, aptpl;
3814         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3815         int ret;
3816
3817         /*
3818          * Following spc2r20 5.5.1 Reservations overview:
3819          *
3820          * If a logical unit has been reserved by any RESERVE command and is
3821          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3822          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3823          * initiator or service action and shall terminate with a RESERVATION
3824          * CONFLICT status.
3825          */
3826         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
3827                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3828                         " SPC-2 reservation is held, returning"
3829                         " RESERVATION_CONFLICT\n");
3830                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3831                 ret = -EINVAL;
3832                 goto out;
3833         }
3834
3835         /*
3836          * FIXME: A NULL struct se_session pointer means an this is not coming from
3837          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3838          */
3839         if (!cmd->se_sess) {
3840                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3841                 ret = -EINVAL;
3842                 goto out;
3843         }
3844
3845         if (cmd->data_length < 24) {
3846                 pr_warn("SPC-PR: Received PR OUT parameter list"
3847                         " length too small: %u\n", cmd->data_length);
3848                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3849                 ret = -EINVAL;
3850                 goto out;
3851         }
3852         /*
3853          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3854          */
3855         sa = (cdb[1] & 0x1f);
3856         scope = (cdb[2] & 0xf0);
3857         type = (cdb[2] & 0x0f);
3858
3859         buf = transport_kmap_data_sg(cmd);
3860         /*
3861          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3862          */
3863         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3864         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3865         /*
3866          * REGISTER_AND_MOVE uses a different SA parameter list containing
3867          * SCSI TransportIDs.
3868          */
3869         if (sa != PRO_REGISTER_AND_MOVE) {
3870                 spec_i_pt = (buf[20] & 0x08);
3871                 all_tg_pt = (buf[20] & 0x04);
3872                 aptpl = (buf[20] & 0x01);
3873         } else {
3874                 aptpl = (buf[17] & 0x01);
3875                 unreg = (buf[17] & 0x02);
3876         }
3877         transport_kunmap_data_sg(cmd);
3878         buf = NULL;
3879
3880         /*
3881          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3882          */
3883         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
3884                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3885                 ret = -EINVAL;
3886                 goto out;
3887         }
3888
3889         /*
3890          * From spc4r17 section 6.14:
3891          *
3892          * If the SPEC_I_PT bit is set to zero, the service action is not
3893          * REGISTER AND MOVE, and the parameter list length is not 24, then
3894          * the command shall be terminated with CHECK CONDITION status, with
3895          * the sense key set to ILLEGAL REQUEST, and the additional sense
3896          * code set to PARAMETER LIST LENGTH ERROR.
3897          */
3898         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3899             (cmd->data_length != 24)) {
3900                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3901                         " list length: %u\n", cmd->data_length);
3902                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3903                 ret = -EINVAL;
3904                 goto out;
3905         }
3906         /*
3907          * (core_scsi3_emulate_pro_* function parameters
3908          * are defined by spc4r17 Table 174:
3909          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3910          */
3911         switch (sa) {
3912         case PRO_REGISTER:
3913                 ret = core_scsi3_emulate_pro_register(cmd,
3914                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3915                 break;
3916         case PRO_RESERVE:
3917                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3918                 break;
3919         case PRO_RELEASE:
3920                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3921                 break;
3922         case PRO_CLEAR:
3923                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3924                 break;
3925         case PRO_PREEMPT:
3926                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3927                                         res_key, sa_res_key, 0);
3928                 break;
3929         case PRO_PREEMPT_AND_ABORT:
3930                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3931                                         res_key, sa_res_key, 1);
3932                 break;
3933         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3934                 ret = core_scsi3_emulate_pro_register(cmd,
3935                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3936                 break;
3937         case PRO_REGISTER_AND_MOVE:
3938                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3939                                 sa_res_key, aptpl, unreg);
3940                 break;
3941         default:
3942                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3943                         " action: 0x%02x\n", cdb[1] & 0x1f);
3944                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3945                 ret = -EINVAL;
3946                 break;
3947         }
3948
3949 out:
3950         if (!ret)
3951                 target_complete_cmd(cmd, GOOD);
3952         return ret;
3953 }
3954
3955 /*
3956  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3957  *
3958  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3959  */
3960 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3961 {
3962         struct se_device *se_dev = cmd->se_dev;
3963         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3964         struct t10_pr_registration *pr_reg;
3965         unsigned char *buf;
3966         u32 add_len = 0, off = 8;
3967
3968         if (cmd->data_length < 8) {
3969                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3970                         " too small\n", cmd->data_length);
3971                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3972                 return -EINVAL;
3973         }
3974
3975         buf = transport_kmap_data_sg(cmd);
3976         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3977         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3978         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3979         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3980
3981         spin_lock(&su_dev->t10_pr.registration_lock);
3982         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3983                         pr_reg_list) {
3984                 /*
3985                  * Check for overflow of 8byte PRI READ_KEYS payload and
3986                  * next reservation key list descriptor.
3987                  */
3988                 if ((add_len + 8) > (cmd->data_length - 8))
3989                         break;
3990
3991                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3992                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3993                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3994                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3995                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3996                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3997                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3998                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3999
4000                 add_len += 8;
4001         }
4002         spin_unlock(&su_dev->t10_pr.registration_lock);
4003
4004         buf[4] = ((add_len >> 24) & 0xff);
4005         buf[5] = ((add_len >> 16) & 0xff);
4006         buf[6] = ((add_len >> 8) & 0xff);
4007         buf[7] = (add_len & 0xff);
4008
4009         transport_kunmap_data_sg(cmd);
4010
4011         return 0;
4012 }
4013
4014 /*
4015  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
4016  *
4017  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
4018  */
4019 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
4020 {
4021         struct se_device *se_dev = cmd->se_dev;
4022         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4023         struct t10_pr_registration *pr_reg;
4024         unsigned char *buf;
4025         u64 pr_res_key;
4026         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
4027
4028         if (cmd->data_length < 8) {
4029                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
4030                         " too small\n", cmd->data_length);
4031                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4032                 return -EINVAL;
4033         }
4034
4035         buf = transport_kmap_data_sg(cmd);
4036         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4037         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4038         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4039         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4040
4041         spin_lock(&se_dev->dev_reservation_lock);
4042         pr_reg = se_dev->dev_pr_res_holder;
4043         if (pr_reg) {
4044                 /*
4045                  * Set the hardcoded Additional Length
4046                  */
4047                 buf[4] = ((add_len >> 24) & 0xff);
4048                 buf[5] = ((add_len >> 16) & 0xff);
4049                 buf[6] = ((add_len >> 8) & 0xff);
4050                 buf[7] = (add_len & 0xff);
4051
4052                 if (cmd->data_length < 22)
4053                         goto err;
4054
4055                 /*
4056                  * Set the Reservation key.
4057                  *
4058                  * From spc4r17, section 5.7.10:
4059                  * A persistent reservation holder has its reservation key
4060                  * returned in the parameter data from a PERSISTENT
4061                  * RESERVE IN command with READ RESERVATION service action as
4062                  * follows:
4063                  * a) For a persistent reservation of the type Write Exclusive
4064                  *    - All Registrants or Exclusive Access  All Regitrants,
4065                  *      the reservation key shall be set to zero; or
4066                  * b) For all other persistent reservation types, the
4067                  *    reservation key shall be set to the registered
4068                  *    reservation key for the I_T nexus that holds the
4069                  *    persistent reservation.
4070                  */
4071                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
4072                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
4073                         pr_res_key = 0;
4074                 else
4075                         pr_res_key = pr_reg->pr_res_key;
4076
4077                 buf[8] = ((pr_res_key >> 56) & 0xff);
4078                 buf[9] = ((pr_res_key >> 48) & 0xff);
4079                 buf[10] = ((pr_res_key >> 40) & 0xff);
4080                 buf[11] = ((pr_res_key >> 32) & 0xff);
4081                 buf[12] = ((pr_res_key >> 24) & 0xff);
4082                 buf[13] = ((pr_res_key >> 16) & 0xff);
4083                 buf[14] = ((pr_res_key >> 8) & 0xff);
4084                 buf[15] = (pr_res_key & 0xff);
4085                 /*
4086                  * Set the SCOPE and TYPE
4087                  */
4088                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
4089                           (pr_reg->pr_res_type & 0x0f);
4090         }
4091
4092 err:
4093         spin_unlock(&se_dev->dev_reservation_lock);
4094         transport_kunmap_data_sg(cmd);
4095
4096         return 0;
4097 }
4098
4099 /*
4100  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
4101  *
4102  * See spc4r17 section 6.13.4 Table 165
4103  */
4104 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
4105 {
4106         struct se_device *dev = cmd->se_dev;
4107         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
4108         unsigned char *buf;
4109         u16 add_len = 8; /* Hardcoded to 8. */
4110
4111         if (cmd->data_length < 6) {
4112                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4113                         " %u too small\n", cmd->data_length);
4114                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4115                 return -EINVAL;
4116         }
4117
4118         buf = transport_kmap_data_sg(cmd);
4119
4120         buf[0] = ((add_len << 8) & 0xff);
4121         buf[1] = (add_len & 0xff);
4122         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4123         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4124         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4125         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4126         /*
4127          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4128          * set the TMV: Task Mask Valid bit.
4129          */
4130         buf[3] |= 0x80;
4131         /*
4132          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4133          */
4134         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4135         /*
4136          * PTPL_A: Persistence across Target Power Loss Active bit
4137          */
4138         if (pr_tmpl->pr_aptpl_active)
4139                 buf[3] |= 0x01;
4140         /*
4141          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4142          */
4143         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4144         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4145         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4146         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4147         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4148         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4149
4150         transport_kunmap_data_sg(cmd);
4151
4152         return 0;
4153 }
4154
4155 /*
4156  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4157  *
4158  * See spc4r17 section 6.13.5 Table 168 and 169
4159  */
4160 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4161 {
4162         struct se_device *se_dev = cmd->se_dev;
4163         struct se_node_acl *se_nacl;
4164         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4165         struct se_portal_group *se_tpg;
4166         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4167         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4168         unsigned char *buf;
4169         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4170         u32 off = 8; /* off into first Full Status descriptor */
4171         int format_code = 0;
4172
4173         if (cmd->data_length < 8) {
4174                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4175                         " too small\n", cmd->data_length);
4176                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4177                 return -EINVAL;
4178         }
4179
4180         buf = transport_kmap_data_sg(cmd);
4181
4182         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4183         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4184         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4185         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4186
4187         spin_lock(&pr_tmpl->registration_lock);
4188         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4189                         &pr_tmpl->registration_list, pr_reg_list) {
4190
4191                 se_nacl = pr_reg->pr_reg_nacl;
4192                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4193                 add_desc_len = 0;
4194
4195                 atomic_inc(&pr_reg->pr_res_holders);
4196                 smp_mb__after_atomic_inc();
4197                 spin_unlock(&pr_tmpl->registration_lock);
4198                 /*
4199                  * Determine expected length of $FABRIC_MOD specific
4200                  * TransportID full status descriptor..
4201                  */
4202                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4203                                 se_tpg, se_nacl, pr_reg, &format_code);
4204
4205                 if ((exp_desc_len + add_len) > cmd->data_length) {
4206                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4207                                 " out of buffer: %d\n", cmd->data_length);
4208                         spin_lock(&pr_tmpl->registration_lock);
4209                         atomic_dec(&pr_reg->pr_res_holders);
4210                         smp_mb__after_atomic_dec();
4211                         break;
4212                 }
4213                 /*
4214                  * Set RESERVATION KEY
4215                  */
4216                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4217                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4218                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4219                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4220                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4221                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4222                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4223                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4224                 off += 4; /* Skip Over Reserved area */
4225
4226                 /*
4227                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4228                  */
4229                 if (pr_reg->pr_reg_all_tg_pt)
4230                         buf[off] = 0x02;
4231                 /*
4232                  * The struct se_lun pointer will be present for the
4233                  * reservation holder for PR_HOLDER bit.
4234                  *
4235                  * Also, if this registration is the reservation
4236                  * holder, fill in SCOPE and TYPE in the next byte.
4237                  */
4238                 if (pr_reg->pr_res_holder) {
4239                         buf[off++] |= 0x01;
4240                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4241                                      (pr_reg->pr_res_type & 0x0f);
4242                 } else
4243                         off += 2;
4244
4245                 off += 4; /* Skip over reserved area */
4246                 /*
4247                  * From spc4r17 6.3.15:
4248                  *
4249                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4250                  * IDENTIFIER field contains the relative port identifier (see
4251                  * 3.1.120) of the target port that is part of the I_T nexus
4252                  * described by this full status descriptor. If the ALL_TG_PT
4253                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4254                  * IDENTIFIER field are not defined by this standard.
4255                  */
4256                 if (!pr_reg->pr_reg_all_tg_pt) {
4257                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4258
4259                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4260                         buf[off++] = (port->sep_rtpi & 0xff);
4261                 } else
4262                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4263
4264                 /*
4265                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4266                  */
4267                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4268                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4269
4270                 spin_lock(&pr_tmpl->registration_lock);
4271                 atomic_dec(&pr_reg->pr_res_holders);
4272                 smp_mb__after_atomic_dec();
4273                 /*
4274                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4275                  */
4276                 buf[off++] = ((desc_len >> 24) & 0xff);
4277                 buf[off++] = ((desc_len >> 16) & 0xff);
4278                 buf[off++] = ((desc_len >> 8) & 0xff);
4279                 buf[off++] = (desc_len & 0xff);
4280                 /*
4281                  * Size of full desctipor header minus TransportID
4282                  * containing $FABRIC_MOD specific) initiator device/port
4283                  * WWN information.
4284                  *
4285                  *  See spc4r17 Section 6.13.5 Table 169
4286                  */
4287                 add_desc_len = (24 + desc_len);
4288
4289                 off += desc_len;
4290                 add_len += add_desc_len;
4291         }
4292         spin_unlock(&pr_tmpl->registration_lock);
4293         /*
4294          * Set ADDITIONAL_LENGTH
4295          */
4296         buf[4] = ((add_len >> 24) & 0xff);
4297         buf[5] = ((add_len >> 16) & 0xff);
4298         buf[6] = ((add_len >> 8) & 0xff);
4299         buf[7] = (add_len & 0xff);
4300
4301         transport_kunmap_data_sg(cmd);
4302
4303         return 0;
4304 }
4305
4306 int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4307 {
4308         int ret;
4309
4310         /*
4311          * Following spc2r20 5.5.1 Reservations overview:
4312          *
4313          * If a logical unit has been reserved by any RESERVE command and is
4314          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4315          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4316          * initiator or service action and shall terminate with a RESERVATION
4317          * CONFLICT status.
4318          */
4319         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
4320                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4321                         " SPC-2 reservation is held, returning"
4322                         " RESERVATION_CONFLICT\n");
4323                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
4324                 return -EINVAL;
4325         }
4326
4327         switch (cmd->t_task_cdb[1] & 0x1f) {
4328         case PRI_READ_KEYS:
4329                 ret = core_scsi3_pri_read_keys(cmd);
4330                 break;
4331         case PRI_READ_RESERVATION:
4332                 ret = core_scsi3_pri_read_reservation(cmd);
4333                 break;
4334         case PRI_REPORT_CAPABILITIES:
4335                 ret = core_scsi3_pri_report_capabilities(cmd);
4336                 break;
4337         case PRI_READ_FULL_STATUS:
4338                 ret = core_scsi3_pri_read_full_status(cmd);
4339                 break;
4340         default:
4341                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4342                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4343                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4344                 ret = -EINVAL;
4345                 break;
4346         }
4347
4348         if (!ret)
4349                 target_complete_cmd(cmd, GOOD);
4350         return ret;
4351 }
4352
4353 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4354 {
4355         return 0;
4356 }
4357
4358 static int core_pt_seq_non_holder(
4359         struct se_cmd *cmd,
4360         unsigned char *cdb,
4361         u32 pr_reg_type)
4362 {
4363         return 0;
4364 }
4365
4366 int core_setup_reservations(struct se_device *dev, int force_pt)
4367 {
4368         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4369         struct t10_reservation *rest = &su_dev->t10_pr;
4370         /*
4371          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4372          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4373          * cause a problem because libata and some SATA RAID HBAs appear
4374          * under Linux/SCSI, but to emulate reservations themselves.
4375          */
4376         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4377             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4378                 rest->res_type = SPC_PASSTHROUGH;
4379                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4380                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4381                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4382                         " emulation\n", dev->transport->name);
4383                 return 0;
4384         }
4385         /*
4386          * If SPC-3 or above is reported by real or emulated struct se_device,
4387          * use emulated Persistent Reservations.
4388          */
4389         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4390                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4391                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4392                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4393                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4394                         " emulation\n", dev->transport->name);
4395         } else {
4396                 rest->res_type = SPC2_RESERVATIONS;
4397                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4398                 rest->pr_ops.t10_seq_non_holder =
4399                                 &core_scsi2_reservation_seq_non_holder;
4400                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4401                         dev->transport->name);
4402         }
4403
4404         return 0;
4405 }