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_device.h>
  37 #include <target/target_core_tmr.h>
  38 #include <target/target_core_tpg.h>
  39 #include <target/target_core_transport.h>
  40 #include <target/target_core_fabric_ops.h>
  41 #include <target/target_core_configfs.h>
  42
  43 #include "target_core_hba.h"
  44 #include "target_core_pr.h"
  45 #include "target_core_ua.h"
  46
  47 /*
  48  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  49  */
  50 struct pr_transport_id_holder {
  51         int dest_local_nexus;
  52         struct t10_pr_registration *dest_pr_reg;
  53         struct se_portal_group *dest_tpg;
  54         struct se_node_acl *dest_node_acl;
  55         struct se_dev_entry *dest_se_deve;
  56         struct list_head dest_list;
  57 };
  58
  59 int core_pr_dump_initiator_port(
  60         struct t10_pr_registration *pr_reg,
  61         char *buf,
  62         u32 size)
  63 {
  64         if (!pr_reg->isid_present_at_reg)
  65                 return 0;
  66
  67         snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
  68         return 1;
  69 }
  70
  71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  72                         struct t10_pr_registration *, int);
  73
  74 static int core_scsi2_reservation_seq_non_holder(
  75         struct se_cmd *cmd,
  76         unsigned char *cdb,
  77         u32 pr_reg_type)
  78 {
  79         switch (cdb[0]) {
  80         case INQUIRY:
  81         case RELEASE:
  82         case RELEASE_10:
  83                 return 0;
  84         default:
  85                 return 1;
  86         }
  87
  88         return 1;
  89 }
  90
  91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
  92 {
  93         struct se_device *dev = cmd->se_dev;
  94         struct se_session *sess = cmd->se_sess;
  95         int ret;
  96
  97         if (!sess)
  98                 return 0;
  99
 100         spin_lock(&dev->dev_reservation_lock);
 101         if (!dev->dev_reserved_node_acl || !sess) {
 102                 spin_unlock(&dev->dev_reservation_lock);
 103                 return 0;
 104         }
 105         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 106                 spin_unlock(&dev->dev_reservation_lock);
 107                 return -EINVAL;
 108         }
 109         if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
 110                 spin_unlock(&dev->dev_reservation_lock);
 111                 return 0;
 112         }
 113         ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
 114         spin_unlock(&dev->dev_reservation_lock);
 115
 116         return ret;
 117 }
 118
 119 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 120                                         struct se_node_acl *, struct se_session *);
 121 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 122
 123 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
 124 {
 125         struct se_session *se_sess = cmd->se_sess;
 126         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 127         struct t10_pr_registration *pr_reg;
 128         struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
 129         int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
 130         int conflict = 0;
 131
 132         if (!crh)
 133                 return false;
 134
 135         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 136                         se_sess);
 137         if (pr_reg) {
 138                 /*
 139                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 140                  * behavior
 141                  *
 142                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 143                  * status, but no reservation shall be established and the
 144                  * persistent reservation shall not be changed, if the command
 145                  * is received from a) and b) below.
 146                  *
 147                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 148                  * status, but the persistent reservation shall not be released,
 149                  * if the command is received from a) and b)
 150                  *
 151                  * a) An I_T nexus that is a persistent reservation holder; or
 152                  * b) An I_T nexus that is registered if a registrants only or
 153                  *    all registrants type persistent reservation is present.
 154                  *
 155                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 156                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 157                  * as defined in SPC-2.
 158                  */
 159                 if (pr_reg->pr_res_holder) {
 160                         core_scsi3_put_pr_reg(pr_reg);
 161                         *ret = 0;
 162                         return false;
 163                 }
 164                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 165                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 166                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 168                         core_scsi3_put_pr_reg(pr_reg);
 169                         *ret = 0;
 170                         return true;
 171                 }
 172                 core_scsi3_put_pr_reg(pr_reg);
 173                 conflict = 1;
 174         } else {
 175                 /*
 176                  * Following spc2r20 5.5.1 Reservations overview:
 177                  *
 178                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 179                  * command with the REGISTER or the REGISTER AND IGNORE
 180                  * EXISTING KEY service action and is still registered by any
 181                  * initiator, all RESERVE commands and all RELEASE commands
 182                  * regardless of initiator shall conflict and shall terminate
 183                  * with a RESERVATION CONFLICT status.
 184                  */
 185                 spin_lock(&pr_tmpl->registration_lock);
 186                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 187                 spin_unlock(&pr_tmpl->registration_lock);
 188         }
 189
 190         if (conflict) {
 191                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 192                         " while active SPC-3 registrations exist,"
 193                         " returning RESERVATION_CONFLICT\n");
 194                 *ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
 195                 return true;
 196         }
 197
 198         return false;
 199 }
 200
 201 int target_scsi2_reservation_release(struct se_cmd *cmd)
 202 {
 203         struct se_device *dev = cmd->se_dev;
 204         struct se_session *sess = cmd->se_sess;
 205         struct se_portal_group *tpg = sess->se_tpg;
 206         int ret;
 207
 208         if (!sess || !tpg)
 209                 return 0;
 210         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 211                 return ret;
 212
 213         spin_lock(&dev->dev_reservation_lock);
 214         if (!dev->dev_reserved_node_acl || !sess) {
 215                 spin_unlock(&dev->dev_reservation_lock);
 216                 return 0;
 217         }
 218
 219         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 220                 spin_unlock(&dev->dev_reservation_lock);
 221                 return 0;
 222         }
 223         dev->dev_reserved_node_acl = NULL;
 224         dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 225         if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
 226                 dev->dev_res_bin_isid = 0;
 227                 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
 228         }
 229         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 230                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 231                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 232                 sess->se_node_acl->initiatorname);
 233         spin_unlock(&dev->dev_reservation_lock);
 234
 235         return 0;
 236 }
 237
 238 int target_scsi2_reservation_reserve(struct se_cmd *cmd)
 239 {
 240         struct se_device *dev = cmd->se_dev;
 241         struct se_session *sess = cmd->se_sess;
 242         struct se_portal_group *tpg = sess->se_tpg;
 243         int ret;
 244
 245         if ((cmd->t_task_cdb[1] & 0x01) &&
 246             (cmd->t_task_cdb[1] & 0x02)) {
 247                 pr_err("LongIO and Obselete Bits set, returning"
 248                                 " ILLEGAL_REQUEST\n");
 249                 return PYX_TRANSPORT_ILLEGAL_REQUEST;
 250         }
 251         /*
 252          * This is currently the case for target_core_mod passthrough struct se_cmd
 253          * ops
 254          */
 255         if (!sess || !tpg)
 256                 return 0;
 257         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 258                 return ret;
 259
 260         spin_lock(&dev->dev_reservation_lock);
 261         if (dev->dev_reserved_node_acl &&
 262            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 263                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 264                         tpg->se_tpg_tfo->get_fabric_name());
 265                 pr_err("Original reserver LUN: %u %s\n",
 266                         cmd->se_lun->unpacked_lun,
 267                         dev->dev_reserved_node_acl->initiatorname);
 268                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 269                         " from %s \n", cmd->se_lun->unpacked_lun,
 270                         cmd->se_deve->mapped_lun,
 271                         sess->se_node_acl->initiatorname);
 272                 spin_unlock(&dev->dev_reservation_lock);
 273                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
 274         }
 275
 276         dev->dev_reserved_node_acl = sess->se_node_acl;
 277         dev->dev_flags |= DF_SPC2_RESERVATIONS;
 278         if (sess->sess_bin_isid != 0) {
 279                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 280                 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
 281         }
 282         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 283                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 284                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 285                 sess->se_node_acl->initiatorname);
 286         spin_unlock(&dev->dev_reservation_lock);
 287
 288         return 0;
 289 }
 290
 291
 292 /*
 293  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 294  *
 295  * This function is called by those initiator ports who are *NOT*
 296  * the active PR reservation holder when a reservation is present.
 297  */
 298 static int core_scsi3_pr_seq_non_holder(
 299         struct se_cmd *cmd,
 300         unsigned char *cdb,
 301         u32 pr_reg_type)
 302 {
 303         struct se_dev_entry *se_deve;
 304         struct se_session *se_sess = cmd->se_sess;
 305         int other_cdb = 0, ignore_reg;
 306         int registered_nexus = 0, ret = 1; /* Conflict by default */
 307         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 308         int we = 0; /* Write Exclusive */
 309         int legacy = 0; /* Act like a legacy device and return
 310                          * RESERVATION CONFLICT on some CDBs */
 311         /*
 312          * A legacy SPC-2 reservation is being held.
 313          */
 314         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
 315                 return core_scsi2_reservation_seq_non_holder(cmd,
 316                                         cdb, pr_reg_type);
 317
 318         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 319         /*
 320          * Determine if the registration should be ignored due to
 321          * non-matching ISIDs in core_scsi3_pr_reservation_check().
 322          */
 323         ignore_reg = (pr_reg_type & 0x80000000);
 324         if (ignore_reg)
 325                 pr_reg_type &= ~0x80000000;
 326
 327         switch (pr_reg_type) {
 328         case PR_TYPE_WRITE_EXCLUSIVE:
 329                 we = 1;
 330         case PR_TYPE_EXCLUSIVE_ACCESS:
 331                 /*
 332                  * Some commands are only allowed for the persistent reservation
 333                  * holder.
 334                  */
 335                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 336                         registered_nexus = 1;
 337                 break;
 338         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 339                 we = 1;
 340         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 341                 /*
 342                  * Some commands are only allowed for registered I_T Nexuses.
 343                  */
 344                 reg_only = 1;
 345                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 346                         registered_nexus = 1;
 347                 break;
 348         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 349                 we = 1;
 350         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 351                 /*
 352                  * Each registered I_T Nexus is a reservation holder.
 353                  */
 354                 all_reg = 1;
 355                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 356                         registered_nexus = 1;
 357                 break;
 358         default:
 359                 return -EINVAL;
 360         }
 361         /*
 362          * Referenced from spc4r17 table 45 for *NON* PR holder access
 363          */
 364         switch (cdb[0]) {
 365         case SECURITY_PROTOCOL_IN:
 366                 if (registered_nexus)
 367                         return 0;
 368                 ret = (we) ? 0 : 1;
 369                 break;
 370         case MODE_SENSE:
 371         case MODE_SENSE_10:
 372         case READ_ATTRIBUTE:
 373         case READ_BUFFER:
 374         case RECEIVE_DIAGNOSTIC:
 375                 if (legacy) {
 376                         ret = 1;
 377                         break;
 378                 }
 379                 if (registered_nexus) {
 380                         ret = 0;
 381                         break;
 382                 }
 383                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 384                 break;
 385         case PERSISTENT_RESERVE_OUT:
 386                 /*
 387                  * This follows PERSISTENT_RESERVE_OUT service actions that
 388                  * are allowed in the presence of various reservations.
 389                  * See spc4r17, table 46
 390                  */
 391                 switch (cdb[1] & 0x1f) {
 392                 case PRO_CLEAR:
 393                 case PRO_PREEMPT:
 394                 case PRO_PREEMPT_AND_ABORT:
 395                         ret = (registered_nexus) ? 0 : 1;
 396                         break;
 397                 case PRO_REGISTER:
 398                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 399                         ret = 0;
 400                         break;
 401                 case PRO_REGISTER_AND_MOVE:
 402                 case PRO_RESERVE:
 403                         ret = 1;
 404                         break;
 405                 case PRO_RELEASE:
 406                         ret = (registered_nexus) ? 0 : 1;
 407                         break;
 408                 default:
 409                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 410                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 411                         return -EINVAL;
 412                 }
 413                 break;
 414         case RELEASE:
 415         case RELEASE_10:
 416                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 417                 ret = 0;
 418                 break;
 419         case RESERVE:
 420         case RESERVE_10:
 421                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 422                 ret = 0;
 423                 break;
 424         case TEST_UNIT_READY:
 425                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 426                 break;
 427         case MAINTENANCE_IN:
 428                 switch (cdb[1] & 0x1f) {
 429                 case MI_MANAGEMENT_PROTOCOL_IN:
 430                         if (registered_nexus) {
 431                                 ret = 0;
 432                                 break;
 433                         }
 434                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 435                         break;
 436                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 437                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 438                         if (legacy) {
 439                                 ret = 1;
 440                                 break;
 441                         }
 442                         if (registered_nexus) {
 443                                 ret = 0;
 444                                 break;
 445                         }
 446                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 447                         break;
 448                 case MI_REPORT_ALIASES:
 449                 case MI_REPORT_IDENTIFYING_INFORMATION:
 450                 case MI_REPORT_PRIORITY:
 451                 case MI_REPORT_TARGET_PGS:
 452                 case MI_REPORT_TIMESTAMP:
 453                         ret = 0; /* Allowed */
 454                         break;
 455                 default:
 456                         pr_err("Unknown MI Service Action: 0x%02x\n",
 457                                 (cdb[1] & 0x1f));
 458                         return -EINVAL;
 459                 }
 460                 break;
 461         case ACCESS_CONTROL_IN:
 462         case ACCESS_CONTROL_OUT:
 463         case INQUIRY:
 464         case LOG_SENSE:
 465         case READ_MEDIA_SERIAL_NUMBER:
 466         case REPORT_LUNS:
 467         case REQUEST_SENSE:
 468                 ret = 0; /*/ Allowed CDBs */
 469                 break;
 470         default:
 471                 other_cdb = 1;
 472                 break;
 473         }
 474         /*
 475          * Case where the CDB is explicitly allowed in the above switch
 476          * statement.
 477          */
 478         if (!ret && !other_cdb) {
 479 #if 0
 480                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 481                         " reservation holder\n", cdb[0],
 482                         core_scsi3_pr_dump_type(pr_reg_type));
 483 #endif
 484                 return ret;
 485         }
 486         /*
 487          * Check if write exclusive initiator ports *NOT* holding the
 488          * WRITE_EXCLUSIVE_* reservation.
 489          */
 490         if ((we) && !(registered_nexus)) {
 491                 if (cmd->data_direction == DMA_TO_DEVICE) {
 492                         /*
 493                          * Conflict for write exclusive
 494                          */
 495                         pr_debug("%s Conflict for unregistered nexus"
 496                                 " %s CDB: 0x%02x to %s reservation\n",
 497                                 transport_dump_cmd_direction(cmd),
 498                                 se_sess->se_node_acl->initiatorname, cdb[0],
 499                                 core_scsi3_pr_dump_type(pr_reg_type));
 500                         return 1;
 501                 } else {
 502                         /*
 503                          * Allow non WRITE CDBs for all Write Exclusive
 504                          * PR TYPEs to pass for registered and
 505                          * non-registered_nexuxes NOT holding the reservation.
 506                          *
 507                          * We only make noise for the unregisterd nexuses,
 508                          * as we expect registered non-reservation holding
 509                          * nexuses to issue CDBs.
 510                          */
 511 #if 0
 512                         if (!registered_nexus) {
 513                                 pr_debug("Allowing implict CDB: 0x%02x"
 514                                         " for %s reservation on unregistered"
 515                                         " nexus\n", cdb[0],
 516                                         core_scsi3_pr_dump_type(pr_reg_type));
 517                         }
 518 #endif
 519                         return 0;
 520                 }
 521         } else if ((reg_only) || (all_reg)) {
 522                 if (registered_nexus) {
 523                         /*
 524                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 525                          * allow commands from registered nexuses.
 526                          */
 527 #if 0
 528                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 529                                 " reservation\n", cdb[0],
 530                                 core_scsi3_pr_dump_type(pr_reg_type));
 531 #endif
 532                         return 0;
 533                 }
 534         }
 535         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 536                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 537                 (registered_nexus) ? "" : "un",
 538                 se_sess->se_node_acl->initiatorname, cdb[0],
 539                 core_scsi3_pr_dump_type(pr_reg_type));
 540
 541         return 1; /* Conflict by default */
 542 }
 543
 544 static u32 core_scsi3_pr_generation(struct se_device *dev)
 545 {
 546         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 547         u32 prg;
 548         /*
 549          * PRGeneration field shall contain the value of a 32-bit wrapping
 550          * counter mainted by the device server.
 551          *
 552          * Note that this is done regardless of Active Persist across
 553          * Target PowerLoss (APTPL)
 554          *
 555          * See spc4r17 section 6.3.12 READ_KEYS service action
 556          */
 557         spin_lock(&dev->dev_reservation_lock);
 558         prg = su_dev->t10_pr.pr_generation++;
 559         spin_unlock(&dev->dev_reservation_lock);
 560
 561         return prg;
 562 }
 563
 564 static int core_scsi3_pr_reservation_check(
 565         struct se_cmd *cmd,
 566         u32 *pr_reg_type)
 567 {
 568         struct se_device *dev = cmd->se_dev;
 569         struct se_session *sess = cmd->se_sess;
 570         int ret;
 571
 572         if (!sess)
 573                 return 0;
 574         /*
 575          * A legacy SPC-2 reservation is being held.
 576          */
 577         if (dev->dev_flags & DF_SPC2_RESERVATIONS)
 578                 return core_scsi2_reservation_check(cmd, pr_reg_type);
 579
 580         spin_lock(&dev->dev_reservation_lock);
 581         if (!dev->dev_pr_res_holder) {
 582                 spin_unlock(&dev->dev_reservation_lock);
 583                 return 0;
 584         }
 585         *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 586         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 587         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
 588                 spin_unlock(&dev->dev_reservation_lock);
 589                 return -EINVAL;
 590         }
 591         if (!dev->dev_pr_res_holder->isid_present_at_reg) {
 592                 spin_unlock(&dev->dev_reservation_lock);
 593                 return 0;
 594         }
 595         ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
 596                sess->sess_bin_isid) ? 0 : -EINVAL;
 597         /*
 598          * Use bit in *pr_reg_type to notify ISID mismatch in
 599          * core_scsi3_pr_seq_non_holder().
 600          */
 601         if (ret != 0)
 602                 *pr_reg_type |= 0x80000000;
 603         spin_unlock(&dev->dev_reservation_lock);
 604
 605         return ret;
 606 }
 607
 608 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 609         struct se_device *dev,
 610         struct se_node_acl *nacl,
 611         struct se_dev_entry *deve,
 612         unsigned char *isid,
 613         u64 sa_res_key,
 614         int all_tg_pt,
 615         int aptpl)
 616 {
 617         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 618         struct t10_pr_registration *pr_reg;
 619
 620         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 621         if (!pr_reg) {
 622                 pr_err("Unable to allocate struct t10_pr_registration\n");
 623                 return NULL;
 624         }
 625
 626         pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
 627                                         GFP_ATOMIC);
 628         if (!pr_reg->pr_aptpl_buf) {
 629                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 630                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 631                 return NULL;
 632         }
 633
 634         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 635         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 636         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 637         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 639         atomic_set(&pr_reg->pr_res_holders, 0);
 640         pr_reg->pr_reg_nacl = nacl;
 641         pr_reg->pr_reg_deve = deve;
 642         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 643         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 644         pr_reg->pr_res_key = sa_res_key;
 645         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 646         pr_reg->pr_reg_aptpl = aptpl;
 647         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 648         /*
 649          * If an ISID value for this SCSI Initiator Port exists,
 650          * save it to the registration now.
 651          */
 652         if (isid != NULL) {
 653                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 654                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 655                 pr_reg->isid_present_at_reg = 1;
 656         }
 657
 658         return pr_reg;
 659 }
 660
 661 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 662 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 663
 664 /*
 665  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 666  * modes.
 667  */
 668 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 669         struct se_device *dev,
 670         struct se_node_acl *nacl,
 671         struct se_dev_entry *deve,
 672         unsigned char *isid,
 673         u64 sa_res_key,
 674         int all_tg_pt,
 675         int aptpl)
 676 {
 677         struct se_dev_entry *deve_tmp;
 678         struct se_node_acl *nacl_tmp;
 679         struct se_port *port, *port_tmp;
 680         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 681         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 682         int ret;
 683         /*
 684          * Create a registration for the I_T Nexus upon which the
 685          * PROUT REGISTER was received.
 686          */
 687         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 688                         sa_res_key, all_tg_pt, aptpl);
 689         if (!pr_reg)
 690                 return NULL;
 691         /*
 692          * Return pointer to pr_reg for ALL_TG_PT=0
 693          */
 694         if (!all_tg_pt)
 695                 return pr_reg;
 696         /*
 697          * Create list of matching SCSI Initiator Port registrations
 698          * for ALL_TG_PT=1
 699          */
 700         spin_lock(&dev->se_port_lock);
 701         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 702                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 703                 smp_mb__after_atomic_inc();
 704                 spin_unlock(&dev->se_port_lock);
 705
 706                 spin_lock_bh(&port->sep_alua_lock);
 707                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 708                                         alua_port_list) {
 709                         /*
 710                          * This pointer will be NULL for demo mode MappedLUNs
 711                          * that have not been make explict via a ConfigFS
 712                          * MappedLUN group for the SCSI Initiator Node ACL.
 713                          */
 714                         if (!deve_tmp->se_lun_acl)
 715                                 continue;
 716
 717                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 718                         /*
 719                          * Skip the matching struct se_node_acl that is allocated
 720                          * above..
 721                          */
 722                         if (nacl == nacl_tmp)
 723                                 continue;
 724                         /*
 725                          * Only perform PR registrations for target ports on
 726                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 727                          * arrived.
 728                          */
 729                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 730                                 continue;
 731                         /*
 732                          * Look for a matching Initiator Node ACL in ASCII format
 733                          */
 734                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 735                                 continue;
 736
 737                         atomic_inc(&deve_tmp->pr_ref_count);
 738                         smp_mb__after_atomic_inc();
 739                         spin_unlock_bh(&port->sep_alua_lock);
 740                         /*
 741                          * Grab a configfs group dependency that is released
 742                          * for the exception path at label out: below, or upon
 743                          * completion of adding ALL_TG_PT=1 registrations in
 744                          * __core_scsi3_add_registration()
 745                          */
 746                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 747                         if (ret < 0) {
 748                                 pr_err("core_scsi3_lunacl_depend"
 749                                                 "_item() failed\n");
 750                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 751                                 smp_mb__after_atomic_dec();
 752                                 atomic_dec(&deve_tmp->pr_ref_count);
 753                                 smp_mb__after_atomic_dec();
 754                                 goto out;
 755                         }
 756                         /*
 757                          * Located a matching SCSI Initiator Port on a different
 758                          * port, allocate the pr_reg_atp and attach it to the
 759                          * pr_reg->pr_reg_atp_list that will be processed once
 760                          * the original *pr_reg is processed in
 761                          * __core_scsi3_add_registration()
 762                          */
 763                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 764                                                 nacl_tmp, deve_tmp, NULL,
 765                                                 sa_res_key, all_tg_pt, aptpl);
 766                         if (!pr_reg_atp) {
 767                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 768                                 smp_mb__after_atomic_dec();
 769                                 atomic_dec(&deve_tmp->pr_ref_count);
 770                                 smp_mb__after_atomic_dec();
 771                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 772                                 goto out;
 773                         }
 774
 775                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 776                                       &pr_reg->pr_reg_atp_list);
 777                         spin_lock_bh(&port->sep_alua_lock);
 778                 }
 779                 spin_unlock_bh(&port->sep_alua_lock);
 780
 781                 spin_lock(&dev->se_port_lock);
 782                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 783                 smp_mb__after_atomic_dec();
 784         }
 785         spin_unlock(&dev->se_port_lock);
 786
 787         return pr_reg;
 788 out:
 789         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 790                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 791                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 792                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 793                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 794         }
 795         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 796         return NULL;
 797 }
 798
 799 int core_scsi3_alloc_aptpl_registration(
 800         struct t10_reservation *pr_tmpl,
 801         u64 sa_res_key,
 802         unsigned char *i_port,
 803         unsigned char *isid,
 804         u32 mapped_lun,
 805         unsigned char *t_port,
 806         u16 tpgt,
 807         u32 target_lun,
 808         int res_holder,
 809         int all_tg_pt,
 810         u8 type)
 811 {
 812         struct t10_pr_registration *pr_reg;
 813
 814         if (!i_port || !t_port || !sa_res_key) {
 815                 pr_err("Illegal parameters for APTPL registration\n");
 816                 return -EINVAL;
 817         }
 818
 819         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 820         if (!pr_reg) {
 821                 pr_err("Unable to allocate struct t10_pr_registration\n");
 822                 return -ENOMEM;
 823         }
 824         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 825
 826         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 827         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 828         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 829         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 830         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 831         atomic_set(&pr_reg->pr_res_holders, 0);
 832         pr_reg->pr_reg_nacl = NULL;
 833         pr_reg->pr_reg_deve = NULL;
 834         pr_reg->pr_res_mapped_lun = mapped_lun;
 835         pr_reg->pr_aptpl_target_lun = target_lun;
 836         pr_reg->pr_res_key = sa_res_key;
 837         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 838         pr_reg->pr_reg_aptpl = 1;
 839         pr_reg->pr_reg_tg_pt_lun = NULL;
 840         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 841         pr_reg->pr_res_type = type;
 842         /*
 843          * If an ISID value had been saved in APTPL metadata for this
 844          * SCSI Initiator Port, restore it now.
 845          */
 846         if (isid != NULL) {
 847                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 848                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 849                 pr_reg->isid_present_at_reg = 1;
 850         }
 851         /*
 852          * Copy the i_port and t_port information from caller.
 853          */
 854         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 855         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 856         pr_reg->pr_reg_tpgt = tpgt;
 857         /*
 858          * Set pr_res_holder from caller, the pr_reg who is the reservation
 859          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 860          * the Initiator Node LUN ACL from the fabric module is created for
 861          * this registration.
 862          */
 863         pr_reg->pr_res_holder = res_holder;
 864
 865         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 866         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 867                         " metadata\n", (res_holder) ? "+reservation" : "");
 868         return 0;
 869 }
 870
 871 static void core_scsi3_aptpl_reserve(
 872         struct se_device *dev,
 873         struct se_portal_group *tpg,
 874         struct se_node_acl *node_acl,
 875         struct t10_pr_registration *pr_reg)
 876 {
 877         char i_buf[PR_REG_ISID_ID_LEN];
 878         int prf_isid;
 879
 880         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 881         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 882                                 PR_REG_ISID_ID_LEN);
 883
 884         spin_lock(&dev->dev_reservation_lock);
 885         dev->dev_pr_res_holder = pr_reg;
 886         spin_unlock(&dev->dev_reservation_lock);
 887
 888         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 889                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 890                 tpg->se_tpg_tfo->get_fabric_name(),
 891                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 892                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 893         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 894                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 895                 (prf_isid) ? &i_buf[0] : "");
 896 }
 897
 898 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 899                                 struct t10_pr_registration *, int, int);
 900
 901 static int __core_scsi3_check_aptpl_registration(
 902         struct se_device *dev,
 903         struct se_portal_group *tpg,
 904         struct se_lun *lun,
 905         u32 target_lun,
 906         struct se_node_acl *nacl,
 907         struct se_dev_entry *deve)
 908 {
 909         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 910         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
 911         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 912         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 913         u16 tpgt;
 914
 915         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 916         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 917         /*
 918          * Copy Initiator Port information from struct se_node_acl
 919          */
 920         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 921         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 922                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 923         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 924         /*
 925          * Look for the matching registrations+reservation from those
 926          * created from APTPL metadata.  Note that multiple registrations
 927          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 928          * TransportIDs.
 929          */
 930         spin_lock(&pr_tmpl->aptpl_reg_lock);
 931         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 932                                 pr_reg_aptpl_list) {
 933                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 934                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 935                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 936                      (pr_reg->pr_reg_tpgt == tpgt) &&
 937                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 938
 939                         pr_reg->pr_reg_nacl = nacl;
 940                         pr_reg->pr_reg_deve = deve;
 941                         pr_reg->pr_reg_tg_pt_lun = lun;
 942
 943                         list_del(&pr_reg->pr_reg_aptpl_list);
 944                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 945                         /*
 946                          * At this point all of the pointers in *pr_reg will
 947                          * be setup, so go ahead and add the registration.
 948                          */
 949
 950                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 951                         /*
 952                          * If this registration is the reservation holder,
 953                          * make that happen now..
 954                          */
 955                         if (pr_reg->pr_res_holder)
 956                                 core_scsi3_aptpl_reserve(dev, tpg,
 957                                                 nacl, pr_reg);
 958                         /*
 959                          * Reenable pr_aptpl_active to accept new metadata
 960                          * updates once the SCSI device is active again..
 961                          */
 962                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 963                         pr_tmpl->pr_aptpl_active = 1;
 964                 }
 965         }
 966         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 967
 968         return 0;
 969 }
 970
 971 int core_scsi3_check_aptpl_registration(
 972         struct se_device *dev,
 973         struct se_portal_group *tpg,
 974         struct se_lun *lun,
 975         struct se_lun_acl *lun_acl)
 976 {
 977         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 978         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 979         struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
 980
 981         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
 982                 return 0;
 983
 984         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 985                                 lun->unpacked_lun, nacl, deve);
 986 }
 987
 988 static void __core_scsi3_dump_registration(
 989         struct target_core_fabric_ops *tfo,
 990         struct se_device *dev,
 991         struct se_node_acl *nacl,
 992         struct t10_pr_registration *pr_reg,
 993         int register_type)
 994 {
 995         struct se_portal_group *se_tpg = nacl->se_tpg;
 996         char i_buf[PR_REG_ISID_ID_LEN];
 997         int prf_isid;
 998
 999         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1000         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1001                                 PR_REG_ISID_ID_LEN);
1002
1003         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1004                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1005                 "_AND_MOVE" : (register_type == 1) ?
1006                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1007                 (prf_isid) ? i_buf : "");
1008         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1009                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1010                 tfo->tpg_get_tag(se_tpg));
1011         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1012                 " Port(s)\n",  tfo->get_fabric_name(),
1013                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1014                 dev->transport->name);
1015         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1016                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1017                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1018                 pr_reg->pr_reg_aptpl);
1019 }
1020
1021 /*
1022  * this function can be called with struct se_device->dev_reservation_lock
1023  * when register_move = 1
1024  */
1025 static void __core_scsi3_add_registration(
1026         struct se_device *dev,
1027         struct se_node_acl *nacl,
1028         struct t10_pr_registration *pr_reg,
1029         int register_type,
1030         int register_move)
1031 {
1032         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1033         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1034         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1035         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1036
1037         /*
1038          * Increment PRgeneration counter for struct se_device upon a successful
1039          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1040          *
1041          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1042          * action, the struct se_device->dev_reservation_lock will already be held,
1043          * so we do not call core_scsi3_pr_generation() which grabs the lock
1044          * for the REGISTER.
1045          */
1046         pr_reg->pr_res_generation = (register_move) ?
1047                         su_dev->t10_pr.pr_generation++ :
1048                         core_scsi3_pr_generation(dev);
1049
1050         spin_lock(&pr_tmpl->registration_lock);
1051         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1052         pr_reg->pr_reg_deve->def_pr_registered = 1;
1053
1054         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1055         spin_unlock(&pr_tmpl->registration_lock);
1056         /*
1057          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1058          */
1059         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1060                 return;
1061         /*
1062          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1063          * allocated in __core_scsi3_alloc_registration()
1064          */
1065         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1066                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1067                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1068
1069                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1070
1071                 spin_lock(&pr_tmpl->registration_lock);
1072                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1073                               &pr_tmpl->registration_list);
1074                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1075
1076                 __core_scsi3_dump_registration(tfo, dev,
1077                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1078                                 register_type);
1079                 spin_unlock(&pr_tmpl->registration_lock);
1080                 /*
1081                  * Drop configfs group dependency reference from
1082                  * __core_scsi3_alloc_registration()
1083                  */
1084                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1085         }
1086 }
1087
1088 static int core_scsi3_alloc_registration(
1089         struct se_device *dev,
1090         struct se_node_acl *nacl,
1091         struct se_dev_entry *deve,
1092         unsigned char *isid,
1093         u64 sa_res_key,
1094         int all_tg_pt,
1095         int aptpl,
1096         int register_type,
1097         int register_move)
1098 {
1099         struct t10_pr_registration *pr_reg;
1100
1101         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1102                         sa_res_key, all_tg_pt, aptpl);
1103         if (!pr_reg)
1104                 return -EPERM;
1105
1106         __core_scsi3_add_registration(dev, nacl, pr_reg,
1107                         register_type, register_move);
1108         return 0;
1109 }
1110
1111 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1112         struct se_device *dev,
1113         struct se_node_acl *nacl,
1114         unsigned char *isid)
1115 {
1116         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1117         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1118         struct se_portal_group *tpg;
1119
1120         spin_lock(&pr_tmpl->registration_lock);
1121         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1122                         &pr_tmpl->registration_list, pr_reg_list) {
1123                 /*
1124                  * First look for a matching struct se_node_acl
1125                  */
1126                 if (pr_reg->pr_reg_nacl != nacl)
1127                         continue;
1128
1129                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1130                 /*
1131                  * If this registration does NOT contain a fabric provided
1132                  * ISID, then we have found a match.
1133                  */
1134                 if (!pr_reg->isid_present_at_reg) {
1135                         /*
1136                          * Determine if this SCSI device server requires that
1137                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1138                          * for fabric modules (iSCSI) requiring them.
1139                          */
1140                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1141                                 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1142                                         continue;
1143                         }
1144                         atomic_inc(&pr_reg->pr_res_holders);
1145                         smp_mb__after_atomic_inc();
1146                         spin_unlock(&pr_tmpl->registration_lock);
1147                         return pr_reg;
1148                 }
1149                 /*
1150                  * If the *pr_reg contains a fabric defined ISID for multi-value
1151                  * SCSI Initiator Port TransportIDs, then we expect a valid
1152                  * matching ISID to be provided by the local SCSI Initiator Port.
1153                  */
1154                 if (!isid)
1155                         continue;
1156                 if (strcmp(isid, pr_reg->pr_reg_isid))
1157                         continue;
1158
1159                 atomic_inc(&pr_reg->pr_res_holders);
1160                 smp_mb__after_atomic_inc();
1161                 spin_unlock(&pr_tmpl->registration_lock);
1162                 return pr_reg;
1163         }
1164         spin_unlock(&pr_tmpl->registration_lock);
1165
1166         return NULL;
1167 }
1168
1169 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1170         struct se_device *dev,
1171         struct se_node_acl *nacl,
1172         struct se_session *sess)
1173 {
1174         struct se_portal_group *tpg = nacl->se_tpg;
1175         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1176
1177         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1178                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1179                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1180                                         PR_REG_ISID_LEN);
1181                 isid_ptr = &buf[0];
1182         }
1183
1184         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1185 }
1186
1187 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1188 {
1189         atomic_dec(&pr_reg->pr_res_holders);
1190         smp_mb__after_atomic_dec();
1191 }
1192
1193 static int core_scsi3_check_implict_release(
1194         struct se_device *dev,
1195         struct t10_pr_registration *pr_reg)
1196 {
1197         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1198         struct t10_pr_registration *pr_res_holder;
1199         int ret = 0;
1200
1201         spin_lock(&dev->dev_reservation_lock);
1202         pr_res_holder = dev->dev_pr_res_holder;
1203         if (!pr_res_holder) {
1204                 spin_unlock(&dev->dev_reservation_lock);
1205                 return ret;
1206         }
1207         if (pr_res_holder == pr_reg) {
1208                 /*
1209                  * Perform an implict RELEASE if the registration that
1210                  * is being released is holding the reservation.
1211                  *
1212                  * From spc4r17, section 5.7.11.1:
1213                  *
1214                  * e) If the I_T nexus is the persistent reservation holder
1215                  *    and the persistent reservation is not an all registrants
1216                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1217                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1218                  *    service action with the SERVICE ACTION RESERVATION KEY
1219                  *    field set to zero (see 5.7.11.3).
1220                  */
1221                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1222                 ret = 1;
1223                 /*
1224                  * For 'All Registrants' reservation types, all existing
1225                  * registrations are still processed as reservation holders
1226                  * in core_scsi3_pr_seq_non_holder() after the initial
1227                  * reservation holder is implictly released here.
1228                  */
1229         } else if (pr_reg->pr_reg_all_tg_pt &&
1230                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1231                           pr_reg->pr_reg_nacl->initiatorname)) &&
1232                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1233                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1234                         " UNREGISTER while existing reservation with matching"
1235                         " key 0x%016Lx is present from another SCSI Initiator"
1236                         " Port\n", pr_reg->pr_res_key);
1237                 ret = -EPERM;
1238         }
1239         spin_unlock(&dev->dev_reservation_lock);
1240
1241         return ret;
1242 }
1243
1244 /*
1245  * Called with struct t10_reservation->registration_lock held.
1246  */
1247 static void __core_scsi3_free_registration(
1248         struct se_device *dev,
1249         struct t10_pr_registration *pr_reg,
1250         struct list_head *preempt_and_abort_list,
1251         int dec_holders)
1252 {
1253         struct target_core_fabric_ops *tfo =
1254                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1255         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1256         char i_buf[PR_REG_ISID_ID_LEN];
1257         int prf_isid;
1258
1259         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1260         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1261                                 PR_REG_ISID_ID_LEN);
1262
1263         pr_reg->pr_reg_deve->def_pr_registered = 0;
1264         pr_reg->pr_reg_deve->pr_res_key = 0;
1265         list_del(&pr_reg->pr_reg_list);
1266         /*
1267          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1268          * so call core_scsi3_put_pr_reg() to decrement our reference.
1269          */
1270         if (dec_holders)
1271                 core_scsi3_put_pr_reg(pr_reg);
1272         /*
1273          * Wait until all reference from any other I_T nexuses for this
1274          * *pr_reg have been released.  Because list_del() is called above,
1275          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1276          * count back to zero, and we release *pr_reg.
1277          */
1278         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1279                 spin_unlock(&pr_tmpl->registration_lock);
1280                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1281                                 tfo->get_fabric_name());
1282                 cpu_relax();
1283                 spin_lock(&pr_tmpl->registration_lock);
1284         }
1285
1286         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1287                 " Node: %s%s\n", tfo->get_fabric_name(),
1288                 pr_reg->pr_reg_nacl->initiatorname,
1289                 (prf_isid) ? &i_buf[0] : "");
1290         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1291                 " Port(s)\n", tfo->get_fabric_name(),
1292                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1293                 dev->transport->name);
1294         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1295                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1296                 pr_reg->pr_res_generation);
1297
1298         if (!preempt_and_abort_list) {
1299                 pr_reg->pr_reg_deve = NULL;
1300                 pr_reg->pr_reg_nacl = NULL;
1301                 kfree(pr_reg->pr_aptpl_buf);
1302                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1303                 return;
1304         }
1305         /*
1306          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1307          * are released once the ABORT_TASK_SET has completed..
1308          */
1309         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1310 }
1311
1312 void core_scsi3_free_pr_reg_from_nacl(
1313         struct se_device *dev,
1314         struct se_node_acl *nacl)
1315 {
1316         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1317         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1318         /*
1319          * If the passed se_node_acl matches the reservation holder,
1320          * release the reservation.
1321          */
1322         spin_lock(&dev->dev_reservation_lock);
1323         pr_res_holder = dev->dev_pr_res_holder;
1324         if ((pr_res_holder != NULL) &&
1325             (pr_res_holder->pr_reg_nacl == nacl))
1326                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1327         spin_unlock(&dev->dev_reservation_lock);
1328         /*
1329          * Release any registration associated with the struct se_node_acl.
1330          */
1331         spin_lock(&pr_tmpl->registration_lock);
1332         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1333                         &pr_tmpl->registration_list, pr_reg_list) {
1334
1335                 if (pr_reg->pr_reg_nacl != nacl)
1336                         continue;
1337
1338                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1339         }
1340         spin_unlock(&pr_tmpl->registration_lock);
1341 }
1342
1343 void core_scsi3_free_all_registrations(
1344         struct se_device *dev)
1345 {
1346         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1347         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1348
1349         spin_lock(&dev->dev_reservation_lock);
1350         pr_res_holder = dev->dev_pr_res_holder;
1351         if (pr_res_holder != NULL) {
1352                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1353                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1354                                 pr_res_holder, 0);
1355         }
1356         spin_unlock(&dev->dev_reservation_lock);
1357
1358         spin_lock(&pr_tmpl->registration_lock);
1359         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1360                         &pr_tmpl->registration_list, pr_reg_list) {
1361
1362                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1363         }
1364         spin_unlock(&pr_tmpl->registration_lock);
1365
1366         spin_lock(&pr_tmpl->aptpl_reg_lock);
1367         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1368                                 pr_reg_aptpl_list) {
1369                 list_del(&pr_reg->pr_reg_aptpl_list);
1370                 kfree(pr_reg->pr_aptpl_buf);
1371                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1372         }
1373         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1374 }
1375
1376 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1377 {
1378         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1379                         &tpg->tpg_group.cg_item);
1380 }
1381
1382 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1383 {
1384         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1385                         &tpg->tpg_group.cg_item);
1386
1387         atomic_dec(&tpg->tpg_pr_ref_count);
1388         smp_mb__after_atomic_dec();
1389 }
1390
1391 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1392 {
1393         struct se_portal_group *tpg = nacl->se_tpg;
1394
1395         if (nacl->dynamic_node_acl)
1396                 return 0;
1397
1398         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1399                         &nacl->acl_group.cg_item);
1400 }
1401
1402 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1403 {
1404         struct se_portal_group *tpg = nacl->se_tpg;
1405
1406         if (nacl->dynamic_node_acl) {
1407                 atomic_dec(&nacl->acl_pr_ref_count);
1408                 smp_mb__after_atomic_dec();
1409                 return;
1410         }
1411
1412         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1413                         &nacl->acl_group.cg_item);
1414
1415         atomic_dec(&nacl->acl_pr_ref_count);
1416         smp_mb__after_atomic_dec();
1417 }
1418
1419 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1420 {
1421         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1422         struct se_node_acl *nacl;
1423         struct se_portal_group *tpg;
1424         /*
1425          * For nacl->dynamic_node_acl=1
1426          */
1427         if (!lun_acl)
1428                 return 0;
1429
1430         nacl = lun_acl->se_lun_nacl;
1431         tpg = nacl->se_tpg;
1432
1433         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1434                         &lun_acl->se_lun_group.cg_item);
1435 }
1436
1437 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1438 {
1439         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1440         struct se_node_acl *nacl;
1441         struct se_portal_group *tpg;
1442         /*
1443          * For nacl->dynamic_node_acl=1
1444          */
1445         if (!lun_acl) {
1446                 atomic_dec(&se_deve->pr_ref_count);
1447                 smp_mb__after_atomic_dec();
1448                 return;
1449         }
1450         nacl = lun_acl->se_lun_nacl;
1451         tpg = nacl->se_tpg;
1452
1453         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1454                         &lun_acl->se_lun_group.cg_item);
1455
1456         atomic_dec(&se_deve->pr_ref_count);
1457         smp_mb__after_atomic_dec();
1458 }
1459
1460 static int core_scsi3_decode_spec_i_port(
1461         struct se_cmd *cmd,
1462         struct se_portal_group *tpg,
1463         unsigned char *l_isid,
1464         u64 sa_res_key,
1465         int all_tg_pt,
1466         int aptpl)
1467 {
1468         struct se_device *dev = cmd->se_dev;
1469         struct se_port *tmp_port;
1470         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1471         struct se_session *se_sess = cmd->se_sess;
1472         struct se_node_acl *dest_node_acl = NULL;
1473         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1474         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1475         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1476         struct list_head tid_dest_list;
1477         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1478         struct target_core_fabric_ops *tmp_tf_ops;
1479         unsigned char *buf;
1480         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1481         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1482         u32 tpdl, tid_len = 0;
1483         int ret, dest_local_nexus, prf_isid;
1484         u32 dest_rtpi = 0;
1485
1486         memset(dest_iport, 0, 64);
1487         INIT_LIST_HEAD(&tid_dest_list);
1488
1489         local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1490         /*
1491          * Allocate a struct pr_transport_id_holder and setup the
1492          * local_node_acl and local_se_deve pointers and add to
1493          * struct list_head tid_dest_list for add registration
1494          * processing in the loop of tid_dest_list below.
1495          */
1496         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1497         if (!tidh_new) {
1498                 pr_err("Unable to allocate tidh_new\n");
1499                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1500         }
1501         INIT_LIST_HEAD(&tidh_new->dest_list);
1502         tidh_new->dest_tpg = tpg;
1503         tidh_new->dest_node_acl = se_sess->se_node_acl;
1504         tidh_new->dest_se_deve = local_se_deve;
1505
1506         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1507                                 se_sess->se_node_acl, local_se_deve, l_isid,
1508                                 sa_res_key, all_tg_pt, aptpl);
1509         if (!local_pr_reg) {
1510                 kfree(tidh_new);
1511                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1512         }
1513         tidh_new->dest_pr_reg = local_pr_reg;
1514         /*
1515          * The local I_T nexus does not hold any configfs dependances,
1516          * so we set tid_h->dest_local_nexus=1 to prevent the
1517          * configfs_undepend_item() calls in the tid_dest_list loops below.
1518          */
1519         tidh_new->dest_local_nexus = 1;
1520         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1521
1522         buf = transport_kmap_first_data_page(cmd);
1523         /*
1524          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1525          * first extract TransportID Parameter Data Length, and make sure
1526          * the value matches up to the SCSI expected data transfer length.
1527          */
1528         tpdl = (buf[24] & 0xff) << 24;
1529         tpdl |= (buf[25] & 0xff) << 16;
1530         tpdl |= (buf[26] & 0xff) << 8;
1531         tpdl |= buf[27] & 0xff;
1532
1533         if ((tpdl + 28) != cmd->data_length) {
1534                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1535                         " does not equal CDB data_length: %u\n", tpdl,
1536                         cmd->data_length);
1537                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1538                 goto out;
1539         }
1540         /*
1541          * Start processing the received transport IDs using the
1542          * receiving I_T Nexus portal's fabric dependent methods to
1543          * obtain the SCSI Initiator Port/Device Identifiers.
1544          */
1545         ptr = &buf[28];
1546
1547         while (tpdl > 0) {
1548                 proto_ident = (ptr[0] & 0x0f);
1549                 dest_tpg = NULL;
1550
1551                 spin_lock(&dev->se_port_lock);
1552                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1553                         tmp_tpg = tmp_port->sep_tpg;
1554                         if (!tmp_tpg)
1555                                 continue;
1556                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1557                         if (!tmp_tf_ops)
1558                                 continue;
1559                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1560                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1561                                 continue;
1562                         /*
1563                          * Look for the matching proto_ident provided by
1564                          * the received TransportID
1565                          */
1566                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1567                         if (tmp_proto_ident != proto_ident)
1568                                 continue;
1569                         dest_rtpi = tmp_port->sep_rtpi;
1570
1571                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1572                                         tmp_tpg, (const char *)ptr, &tid_len,
1573                                         &iport_ptr);
1574                         if (!i_str)
1575                                 continue;
1576
1577                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1578                         smp_mb__after_atomic_inc();
1579                         spin_unlock(&dev->se_port_lock);
1580
1581                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1582                         if (ret != 0) {
1583                                 pr_err(" core_scsi3_tpg_depend_item()"
1584                                         " for tmp_tpg\n");
1585                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1586                                 smp_mb__after_atomic_dec();
1587                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1588                                 goto out;
1589                         }
1590                         /*
1591                          * Locate the desination initiator ACL to be registered
1592                          * from the decoded fabric module specific TransportID
1593                          * at *i_str.
1594                          */
1595                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1596                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1597                                                 tmp_tpg, i_str);
1598                         if (dest_node_acl) {
1599                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1600                                 smp_mb__after_atomic_inc();
1601                         }
1602                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1603
1604                         if (!dest_node_acl) {
1605                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1606                                 spin_lock(&dev->se_port_lock);
1607                                 continue;
1608                         }
1609
1610                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1611                         if (ret != 0) {
1612                                 pr_err("configfs_depend_item() failed"
1613                                         " for dest_node_acl->acl_group\n");
1614                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1615                                 smp_mb__after_atomic_dec();
1616                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1617                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1618                                 goto out;
1619                         }
1620
1621                         dest_tpg = tmp_tpg;
1622                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1623                                 " %s Port RTPI: %hu\n",
1624                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1625                                 dest_node_acl->initiatorname, dest_rtpi);
1626
1627                         spin_lock(&dev->se_port_lock);
1628                         break;
1629                 }
1630                 spin_unlock(&dev->se_port_lock);
1631
1632                 if (!dest_tpg) {
1633                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1634                                         " dest_tpg\n");
1635                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1636                         goto out;
1637                 }
1638 #if 0
1639                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1640                         " tid_len: %d for %s + %s\n",
1641                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1642                         tpdl, tid_len, i_str, iport_ptr);
1643 #endif
1644                 if (tid_len > tpdl) {
1645                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1646                                 " %u for Transport ID: %s\n", tid_len, ptr);
1647                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1648                         core_scsi3_tpg_undepend_item(dest_tpg);
1649                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1650                         goto out;
1651                 }
1652                 /*
1653                  * Locate the desintation struct se_dev_entry pointer for matching
1654                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1655                  * Target Port.
1656                  */
1657                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1658                                         dest_rtpi);
1659                 if (!dest_se_deve) {
1660                         pr_err("Unable to locate %s dest_se_deve"
1661                                 " from destination RTPI: %hu\n",
1662                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1663                                 dest_rtpi);
1664
1665                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1666                         core_scsi3_tpg_undepend_item(dest_tpg);
1667                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1668                         goto out;
1669                 }
1670
1671                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1672                 if (ret < 0) {
1673                         pr_err("core_scsi3_lunacl_depend_item()"
1674                                         " failed\n");
1675                         atomic_dec(&dest_se_deve->pr_ref_count);
1676                         smp_mb__after_atomic_dec();
1677                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1678                         core_scsi3_tpg_undepend_item(dest_tpg);
1679                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1680                         goto out;
1681                 }
1682 #if 0
1683                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1684                         " dest_se_deve mapped_lun: %u\n",
1685                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1686                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1687 #endif
1688                 /*
1689                  * Skip any TransportIDs that already have a registration for
1690                  * this target port.
1691                  */
1692                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1693                                         iport_ptr);
1694                 if (pr_reg_e) {
1695                         core_scsi3_put_pr_reg(pr_reg_e);
1696                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1697                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1698                         core_scsi3_tpg_undepend_item(dest_tpg);
1699                         ptr += tid_len;
1700                         tpdl -= tid_len;
1701                         tid_len = 0;
1702                         continue;
1703                 }
1704                 /*
1705                  * Allocate a struct pr_transport_id_holder and setup
1706                  * the dest_node_acl and dest_se_deve pointers for the
1707                  * loop below.
1708                  */
1709                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1710                                 GFP_KERNEL);
1711                 if (!tidh_new) {
1712                         pr_err("Unable to allocate tidh_new\n");
1713                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1714                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1715                         core_scsi3_tpg_undepend_item(dest_tpg);
1716                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1717                         goto out;
1718                 }
1719                 INIT_LIST_HEAD(&tidh_new->dest_list);
1720                 tidh_new->dest_tpg = dest_tpg;
1721                 tidh_new->dest_node_acl = dest_node_acl;
1722                 tidh_new->dest_se_deve = dest_se_deve;
1723
1724                 /*
1725                  * Allocate, but do NOT add the registration for the
1726                  * TransportID referenced SCSI Initiator port.  This
1727                  * done because of the following from spc4r17 in section
1728                  * 6.14.3 wrt SPEC_I_PT:
1729                  *
1730                  * "If a registration fails for any initiator port (e.g., if th
1731                  * logical unit does not have enough resources available to
1732                  * hold the registration information), no registrations shall be
1733                  * made, and the command shall be terminated with
1734                  * CHECK CONDITION status."
1735                  *
1736                  * That means we call __core_scsi3_alloc_registration() here,
1737                  * and then call __core_scsi3_add_registration() in the
1738                  * 2nd loop which will never fail.
1739                  */
1740                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1741                                 dest_node_acl, dest_se_deve, iport_ptr,
1742                                 sa_res_key, all_tg_pt, aptpl);
1743                 if (!dest_pr_reg) {
1744                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1745                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1746                         core_scsi3_tpg_undepend_item(dest_tpg);
1747                         kfree(tidh_new);
1748                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1749                         goto out;
1750                 }
1751                 tidh_new->dest_pr_reg = dest_pr_reg;
1752                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1753
1754                 ptr += tid_len;
1755                 tpdl -= tid_len;
1756                 tid_len = 0;
1757
1758         }
1759
1760         transport_kunmap_first_data_page(cmd);
1761
1762         /*
1763          * Go ahead and create a registrations from tid_dest_list for the
1764          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1765          * and dest_se_deve.
1766          *
1767          * The SA Reservation Key from the PROUT is set for the
1768          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1769          * means that the TransportID Initiator port will be
1770          * registered on all of the target ports in the SCSI target device
1771          * ALL_TG_PT=0 means the registration will only be for the
1772          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1773          * was received.
1774          */
1775         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1776                 dest_tpg = tidh->dest_tpg;
1777                 dest_node_acl = tidh->dest_node_acl;
1778                 dest_se_deve = tidh->dest_se_deve;
1779                 dest_pr_reg = tidh->dest_pr_reg;
1780                 dest_local_nexus = tidh->dest_local_nexus;
1781
1782                 list_del(&tidh->dest_list);
1783                 kfree(tidh);
1784
1785                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1786                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1787                                                 PR_REG_ISID_ID_LEN);
1788
1789                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1790                                         dest_pr_reg, 0, 0);
1791
1792                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1793                         " registered Transport ID for Node: %s%s Mapped LUN:"
1794                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1795                         dest_node_acl->initiatorname, (prf_isid) ?
1796                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1797
1798                 if (dest_local_nexus)
1799                         continue;
1800
1801                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1802                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1803                 core_scsi3_tpg_undepend_item(dest_tpg);
1804         }
1805
1806         return 0;
1807 out:
1808         transport_kunmap_first_data_page(cmd);
1809         /*
1810          * For the failure case, release everything from tid_dest_list
1811          * including *dest_pr_reg and the configfs dependances..
1812          */
1813         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1814                 dest_tpg = tidh->dest_tpg;
1815                 dest_node_acl = tidh->dest_node_acl;
1816                 dest_se_deve = tidh->dest_se_deve;
1817                 dest_pr_reg = tidh->dest_pr_reg;
1818                 dest_local_nexus = tidh->dest_local_nexus;
1819
1820                 list_del(&tidh->dest_list);
1821                 kfree(tidh);
1822                 /*
1823                  * Release any extra ALL_TG_PT=1 registrations for
1824                  * the SPEC_I_PT=1 case.
1825                  */
1826                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1827                                 &dest_pr_reg->pr_reg_atp_list,
1828                                 pr_reg_atp_mem_list) {
1829                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1830                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1831                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1832                 }
1833
1834                 kfree(dest_pr_reg->pr_aptpl_buf);
1835                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1836
1837                 if (dest_local_nexus)
1838                         continue;
1839
1840                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1841                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1842                 core_scsi3_tpg_undepend_item(dest_tpg);
1843         }
1844         return ret;
1845 }
1846
1847 /*
1848  * Called with struct se_device->dev_reservation_lock held
1849  */
1850 static int __core_scsi3_update_aptpl_buf(
1851         struct se_device *dev,
1852         unsigned char *buf,
1853         u32 pr_aptpl_buf_len,
1854         int clear_aptpl_metadata)
1855 {
1856         struct se_lun *lun;
1857         struct se_portal_group *tpg;
1858         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1859         struct t10_pr_registration *pr_reg;
1860         unsigned char tmp[512], isid_buf[32];
1861         ssize_t len = 0;
1862         int reg_count = 0;
1863
1864         memset(buf, 0, pr_aptpl_buf_len);
1865         /*
1866          * Called to clear metadata once APTPL has been deactivated.
1867          */
1868         if (clear_aptpl_metadata) {
1869                 snprintf(buf, pr_aptpl_buf_len,
1870                                 "No Registrations or Reservations\n");
1871                 return 0;
1872         }
1873         /*
1874          * Walk the registration list..
1875          */
1876         spin_lock(&su_dev->t10_pr.registration_lock);
1877         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1878                         pr_reg_list) {
1879
1880                 tmp[0] = '\0';
1881                 isid_buf[0] = '\0';
1882                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1883                 lun = pr_reg->pr_reg_tg_pt_lun;
1884                 /*
1885                  * Write out any ISID value to APTPL metadata that was included
1886                  * in the original registration.
1887                  */
1888                 if (pr_reg->isid_present_at_reg)
1889                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1890                                         pr_reg->pr_reg_isid);
1891                 /*
1892                  * Include special metadata if the pr_reg matches the
1893                  * reservation holder.
1894                  */
1895                 if (dev->dev_pr_res_holder == pr_reg) {
1896                         snprintf(tmp, 512, "PR_REG_START: %d"
1897                                 "\ninitiator_fabric=%s\n"
1898                                 "initiator_node=%s\n%s"
1899                                 "sa_res_key=%llu\n"
1900                                 "res_holder=1\nres_type=%02x\n"
1901                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1902                                 "mapped_lun=%u\n", reg_count,
1903                                 tpg->se_tpg_tfo->get_fabric_name(),
1904                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1905                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1906                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1907                                 pr_reg->pr_res_mapped_lun);
1908                 } else {
1909                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1910                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1911                                 "sa_res_key=%llu\nres_holder=0\n"
1912                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1913                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1914                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1915                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1916                                 pr_reg->pr_res_mapped_lun);
1917                 }
1918
1919                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1920                         pr_err("Unable to update renaming"
1921                                 " APTPL metadata\n");
1922                         spin_unlock(&su_dev->t10_pr.registration_lock);
1923                         return -EMSGSIZE;
1924                 }
1925                 len += sprintf(buf+len, "%s", tmp);
1926
1927                 /*
1928                  * Include information about the associated SCSI target port.
1929                  */
1930                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1931                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1932                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1933                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1934                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1935                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1936
1937                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1938                         pr_err("Unable to update renaming"
1939                                 " APTPL metadata\n");
1940                         spin_unlock(&su_dev->t10_pr.registration_lock);
1941                         return -EMSGSIZE;
1942                 }
1943                 len += sprintf(buf+len, "%s", tmp);
1944                 reg_count++;
1945         }
1946         spin_unlock(&su_dev->t10_pr.registration_lock);
1947
1948         if (!reg_count)
1949                 len += sprintf(buf+len, "No Registrations or Reservations");
1950
1951         return 0;
1952 }
1953
1954 static int core_scsi3_update_aptpl_buf(
1955         struct se_device *dev,
1956         unsigned char *buf,
1957         u32 pr_aptpl_buf_len,
1958         int clear_aptpl_metadata)
1959 {
1960         int ret;
1961
1962         spin_lock(&dev->dev_reservation_lock);
1963         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1964                                 clear_aptpl_metadata);
1965         spin_unlock(&dev->dev_reservation_lock);
1966
1967         return ret;
1968 }
1969
1970 /*
1971  * Called with struct se_device->aptpl_file_mutex held
1972  */
1973 static int __core_scsi3_write_aptpl_to_file(
1974         struct se_device *dev,
1975         unsigned char *buf,
1976         u32 pr_aptpl_buf_len)
1977 {
1978         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1979         struct file *file;
1980         struct iovec iov[1];
1981         mm_segment_t old_fs;
1982         int flags = O_RDWR | O_CREAT | O_TRUNC;
1983         char path[512];
1984         int ret;
1985
1986         memset(iov, 0, sizeof(struct iovec));
1987         memset(path, 0, 512);
1988
1989         if (strlen(&wwn->unit_serial[0]) >= 512) {
1990                 pr_err("WWN value for struct se_device does not fit"
1991                         " into path buffer\n");
1992                 return -EMSGSIZE;
1993         }
1994
1995         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1996         file = filp_open(path, flags, 0600);
1997         if (IS_ERR(file) || !file || !file->f_dentry) {
1998                 pr_err("filp_open(%s) for APTPL metadata"
1999                         " failed\n", path);
2000                 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2001         }
2002
2003         iov[0].iov_base = &buf[0];
2004         if (!pr_aptpl_buf_len)
2005                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2006         else
2007                 iov[0].iov_len = pr_aptpl_buf_len;
2008
2009         old_fs = get_fs();
2010         set_fs(get_ds());
2011         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2012         set_fs(old_fs);
2013
2014         if (ret < 0) {
2015                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2016                 filp_close(file, NULL);
2017                 return -EIO;
2018         }
2019         filp_close(file, NULL);
2020
2021         return 0;
2022 }
2023
2024 static int core_scsi3_update_and_write_aptpl(
2025         struct se_device *dev,
2026         unsigned char *in_buf,
2027         u32 in_pr_aptpl_buf_len)
2028 {
2029         unsigned char null_buf[64], *buf;
2030         u32 pr_aptpl_buf_len;
2031         int ret, clear_aptpl_metadata = 0;
2032         /*
2033          * Can be called with a NULL pointer from PROUT service action CLEAR
2034          */
2035         if (!in_buf) {
2036                 memset(null_buf, 0, 64);
2037                 buf = &null_buf[0];
2038                 /*
2039                  * This will clear the APTPL metadata to:
2040                  * "No Registrations or Reservations" status
2041                  */
2042                 pr_aptpl_buf_len = 64;
2043                 clear_aptpl_metadata = 1;
2044         } else {
2045                 buf = in_buf;
2046                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2047         }
2048
2049         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2050                                 clear_aptpl_metadata);
2051         if (ret != 0)
2052                 return ret;
2053         /*
2054          * __core_scsi3_write_aptpl_to_file() will call strlen()
2055          * on the passed buf to determine pr_aptpl_buf_len.
2056          */
2057         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2058         if (ret != 0)
2059                 return ret;
2060
2061         return ret;
2062 }
2063
2064 static int core_scsi3_emulate_pro_register(
2065         struct se_cmd *cmd,
2066         u64 res_key,
2067         u64 sa_res_key,
2068         int aptpl,
2069         int all_tg_pt,
2070         int spec_i_pt,
2071         int ignore_key)
2072 {
2073         struct se_session *se_sess = cmd->se_sess;
2074         struct se_device *dev = cmd->se_dev;
2075         struct se_dev_entry *se_deve;
2076         struct se_lun *se_lun = cmd->se_lun;
2077         struct se_portal_group *se_tpg;
2078         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2079         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2080         /* Used for APTPL metadata w/ UNREGISTER */
2081         unsigned char *pr_aptpl_buf = NULL;
2082         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2083         int pr_holder = 0, ret = 0, type;
2084
2085         if (!se_sess || !se_lun) {
2086                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2087                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2088         }
2089         se_tpg = se_sess->se_tpg;
2090         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2091
2092         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2093                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2094                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2095                                 PR_REG_ISID_LEN);
2096                 isid_ptr = &isid_buf[0];
2097         }
2098         /*
2099          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2100          */
2101         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2102         if (!pr_reg_e) {
2103                 if (res_key) {
2104                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2105                                 " for SA REGISTER, returning CONFLICT\n");
2106                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2107                 }
2108                 /*
2109                  * Do nothing but return GOOD status.
2110                  */
2111                 if (!sa_res_key)
2112                         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2113
2114                 if (!spec_i_pt) {
2115                         /*
2116                          * Perform the Service Action REGISTER on the Initiator
2117                          * Port Endpoint that the PRO was received from on the
2118                          * Logical Unit of the SCSI device server.
2119                          */
2120                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2121                                         se_sess->se_node_acl, se_deve, isid_ptr,
2122                                         sa_res_key, all_tg_pt, aptpl,
2123                                         ignore_key, 0);
2124                         if (ret != 0) {
2125                                 pr_err("Unable to allocate"
2126                                         " struct t10_pr_registration\n");
2127                                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2128                         }
2129                 } else {
2130                         /*
2131                          * Register both the Initiator port that received
2132                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2133                          * TransportID from Parameter list and loop through
2134                          * fabric dependent parameter list while calling
2135                          * logic from of core_scsi3_alloc_registration() for
2136                          * each TransportID provided SCSI Initiator Port/Device
2137                          */
2138                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2139                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2140                         if (ret != 0)
2141                                 return ret;
2142                 }
2143                 /*
2144                  * Nothing left to do for the APTPL=0 case.
2145                  */
2146                 if (!aptpl) {
2147                         pr_tmpl->pr_aptpl_active = 0;
2148                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2149                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2150                                         " REGISTER\n");
2151                         return 0;
2152                 }
2153                 /*
2154                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2155                  * update the APTPL metadata information using its
2156                  * preallocated *pr_reg->pr_aptpl_buf.
2157                  */
2158                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2159                                 se_sess->se_node_acl, se_sess);
2160
2161                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2162                                 &pr_reg->pr_aptpl_buf[0],
2163                                 pr_tmpl->pr_aptpl_buf_len);
2164                 if (!ret) {
2165                         pr_tmpl->pr_aptpl_active = 1;
2166                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2167                 }
2168
2169                 core_scsi3_put_pr_reg(pr_reg);
2170                 return ret;
2171         } else {
2172                 /*
2173                  * Locate the existing *pr_reg via struct se_node_acl pointers
2174                  */
2175                 pr_reg = pr_reg_e;
2176                 type = pr_reg->pr_res_type;
2177
2178                 if (!ignore_key) {
2179                         if (res_key != pr_reg->pr_res_key) {
2180                                 pr_err("SPC-3 PR REGISTER: Received"
2181                                         " res_key: 0x%016Lx does not match"
2182                                         " existing SA REGISTER res_key:"
2183                                         " 0x%016Lx\n", res_key,
2184                                         pr_reg->pr_res_key);
2185                                 core_scsi3_put_pr_reg(pr_reg);
2186                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2187                         }
2188                 }
2189                 if (spec_i_pt) {
2190                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2191                                 " set while sa_res_key=0\n");
2192                         core_scsi3_put_pr_reg(pr_reg);
2193                         return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2194                 }
2195                 /*
2196                  * An existing ALL_TG_PT=1 registration being released
2197                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2198                  */
2199                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2200                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2201                                 " registration exists, but ALL_TG_PT=1 bit not"
2202                                 " present in received PROUT\n");
2203                         core_scsi3_put_pr_reg(pr_reg);
2204                         return PYX_TRANSPORT_INVALID_CDB_FIELD;
2205                 }
2206                 /*
2207                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2208                  */
2209                 if (aptpl) {
2210                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2211                                                 GFP_KERNEL);
2212                         if (!pr_aptpl_buf) {
2213                                 pr_err("Unable to allocate"
2214                                         " pr_aptpl_buf\n");
2215                                 core_scsi3_put_pr_reg(pr_reg);
2216                                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2217                         }
2218                 }
2219                 /*
2220                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2221                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2222                  * Nexus.
2223                  */
2224                 if (!sa_res_key) {
2225                         pr_holder = core_scsi3_check_implict_release(
2226                                         cmd->se_dev, pr_reg);
2227                         if (pr_holder < 0) {
2228                                 kfree(pr_aptpl_buf);
2229                                 core_scsi3_put_pr_reg(pr_reg);
2230                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2231                         }
2232
2233                         spin_lock(&pr_tmpl->registration_lock);
2234                         /*
2235                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2236                          * and matching pr_res_key.
2237                          */
2238                         if (pr_reg->pr_reg_all_tg_pt) {
2239                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2240                                                 &pr_tmpl->registration_list,
2241                                                 pr_reg_list) {
2242
2243                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2244                                                 continue;
2245
2246                                         if (pr_reg_p->pr_res_key != res_key)
2247                                                 continue;
2248
2249                                         if (pr_reg == pr_reg_p)
2250                                                 continue;
2251
2252                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2253                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2254                                                 continue;
2255
2256                                         __core_scsi3_free_registration(dev,
2257                                                         pr_reg_p, NULL, 0);
2258                                 }
2259                         }
2260                         /*
2261                          * Release the calling I_T Nexus registration now..
2262                          */
2263                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2264                                                         NULL, 1);
2265                         /*
2266                          * From spc4r17, section 5.7.11.3 Unregistering
2267                          *
2268                          * If the persistent reservation is a registrants only
2269                          * type, the device server shall establish a unit
2270                          * attention condition for the initiator port associated
2271                          * with every registered I_T nexus except for the I_T
2272                          * nexus on which the PERSISTENT RESERVE OUT command was
2273                          * received, with the additional sense code set to
2274                          * RESERVATIONS RELEASED.
2275                          */
2276                         if (pr_holder &&
2277                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2278                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2279                                 list_for_each_entry(pr_reg_p,
2280                                                 &pr_tmpl->registration_list,
2281                                                 pr_reg_list) {
2282
2283                                         core_scsi3_ua_allocate(
2284                                                 pr_reg_p->pr_reg_nacl,
2285                                                 pr_reg_p->pr_res_mapped_lun,
2286                                                 0x2A,
2287                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2288                                 }
2289                         }
2290                         spin_unlock(&pr_tmpl->registration_lock);
2291
2292                         if (!aptpl) {
2293                                 pr_tmpl->pr_aptpl_active = 0;
2294                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2295                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2296                                                 " for UNREGISTER\n");
2297                                 return 0;
2298                         }
2299
2300                         ret = core_scsi3_update_and_write_aptpl(dev,
2301                                         &pr_aptpl_buf[0],
2302                                         pr_tmpl->pr_aptpl_buf_len);
2303                         if (!ret) {
2304                                 pr_tmpl->pr_aptpl_active = 1;
2305                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2306                                                 " for UNREGISTER\n");
2307                         }
2308
2309                         kfree(pr_aptpl_buf);
2310                         return ret;
2311                 } else {
2312                         /*
2313                          * Increment PRgeneration counter for struct se_device"
2314                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2315                          * READ_KEYS service action.
2316                          */
2317                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2318                                                         cmd->se_dev);
2319                         pr_reg->pr_res_key = sa_res_key;
2320                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2321                                 " Key for %s to: 0x%016Lx PRgeneration:"
2322                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2323                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2324                                 pr_reg->pr_reg_nacl->initiatorname,
2325                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2326
2327                         if (!aptpl) {
2328                                 pr_tmpl->pr_aptpl_active = 0;
2329                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2330                                 core_scsi3_put_pr_reg(pr_reg);
2331                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2332                                                 " for REGISTER\n");
2333                                 return 0;
2334                         }
2335
2336                         ret = core_scsi3_update_and_write_aptpl(dev,
2337                                         &pr_aptpl_buf[0],
2338                                         pr_tmpl->pr_aptpl_buf_len);
2339                         if (!ret) {
2340                                 pr_tmpl->pr_aptpl_active = 1;
2341                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2342                                                 " for REGISTER\n");
2343                         }
2344
2345                         kfree(pr_aptpl_buf);
2346                         core_scsi3_put_pr_reg(pr_reg);
2347                 }
2348         }
2349         return 0;
2350 }
2351
2352 unsigned char *core_scsi3_pr_dump_type(int type)
2353 {
2354         switch (type) {
2355         case PR_TYPE_WRITE_EXCLUSIVE:
2356                 return "Write Exclusive Access";
2357         case PR_TYPE_EXCLUSIVE_ACCESS:
2358                 return "Exclusive Access";
2359         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2360                 return "Write Exclusive Access, Registrants Only";
2361         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2362                 return "Exclusive Access, Registrants Only";
2363         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2364                 return "Write Exclusive Access, All Registrants";
2365         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2366                 return "Exclusive Access, All Registrants";
2367         default:
2368                 break;
2369         }
2370
2371         return "Unknown SPC-3 PR Type";
2372 }
2373
2374 static int core_scsi3_pro_reserve(
2375         struct se_cmd *cmd,
2376         struct se_device *dev,
2377         int type,
2378         int scope,
2379         u64 res_key)
2380 {
2381         struct se_session *se_sess = cmd->se_sess;
2382         struct se_dev_entry *se_deve;
2383         struct se_lun *se_lun = cmd->se_lun;
2384         struct se_portal_group *se_tpg;
2385         struct t10_pr_registration *pr_reg, *pr_res_holder;
2386         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2387         char i_buf[PR_REG_ISID_ID_LEN];
2388         int ret, prf_isid;
2389
2390         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2391
2392         if (!se_sess || !se_lun) {
2393                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2394                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2395         }
2396         se_tpg = se_sess->se_tpg;
2397         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2398         /*
2399          * Locate the existing *pr_reg via struct se_node_acl pointers
2400          */
2401         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2402                                 se_sess);
2403         if (!pr_reg) {
2404                 pr_err("SPC-3 PR: Unable to locate"
2405                         " PR_REGISTERED *pr_reg for RESERVE\n");
2406                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2407         }
2408         /*
2409          * From spc4r17 Section 5.7.9: Reserving:
2410          *
2411          * An application client creates a persistent reservation by issuing
2412          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2413          * a registered I_T nexus with the following parameters:
2414          *    a) RESERVATION KEY set to the value of the reservation key that is
2415          *       registered with the logical unit for the I_T nexus; and
2416          */
2417         if (res_key != pr_reg->pr_res_key) {
2418                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2419                         " does not match existing SA REGISTER res_key:"
2420                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2421                 core_scsi3_put_pr_reg(pr_reg);
2422                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2423         }
2424         /*
2425          * From spc4r17 Section 5.7.9: Reserving:
2426          *
2427          * From above:
2428          *  b) TYPE field and SCOPE field set to the persistent reservation
2429          *     being created.
2430          *
2431          * Only one persistent reservation is allowed at a time per logical unit
2432          * and that persistent reservation has a scope of LU_SCOPE.
2433          */
2434         if (scope != PR_SCOPE_LU_SCOPE) {
2435                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2436                 core_scsi3_put_pr_reg(pr_reg);
2437                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2438         }
2439         /*
2440          * See if we have an existing PR reservation holder pointer at
2441          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2442          * *pr_res_holder.
2443          */
2444         spin_lock(&dev->dev_reservation_lock);
2445         pr_res_holder = dev->dev_pr_res_holder;
2446         if ((pr_res_holder)) {
2447                 /*
2448                  * From spc4r17 Section 5.7.9: Reserving:
2449                  *
2450                  * If the device server receives a PERSISTENT RESERVE OUT
2451                  * command from an I_T nexus other than a persistent reservation
2452                  * holder (see 5.7.10) that attempts to create a persistent
2453                  * reservation when a persistent reservation already exists for
2454                  * the logical unit, then the command shall be completed with
2455                  * RESERVATION CONFLICT status.
2456                  */
2457                 if (pr_res_holder != pr_reg) {
2458                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2459                         pr_err("SPC-3 PR: Attempted RESERVE from"
2460                                 " [%s]: %s while reservation already held by"
2461                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2462                                 cmd->se_tfo->get_fabric_name(),
2463                                 se_sess->se_node_acl->initiatorname,
2464                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2465                                 pr_res_holder->pr_reg_nacl->initiatorname);
2466
2467                         spin_unlock(&dev->dev_reservation_lock);
2468                         core_scsi3_put_pr_reg(pr_reg);
2469                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2470                 }
2471                 /*
2472                  * From spc4r17 Section 5.7.9: Reserving:
2473                  *
2474                  * If a persistent reservation holder attempts to modify the
2475                  * type or scope of an existing persistent reservation, the
2476                  * command shall be completed with RESERVATION CONFLICT status.
2477                  */
2478                 if ((pr_res_holder->pr_res_type != type) ||
2479                     (pr_res_holder->pr_res_scope != scope)) {
2480                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2481                         pr_err("SPC-3 PR: Attempted RESERVE from"
2482                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2483                                 " while reservation already held by [%s]: %s,"
2484                                 " returning RESERVATION_CONFLICT\n",
2485                                 cmd->se_tfo->get_fabric_name(),
2486                                 se_sess->se_node_acl->initiatorname,
2487                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2488                                 pr_res_holder->pr_reg_nacl->initiatorname);
2489
2490                         spin_unlock(&dev->dev_reservation_lock);
2491                         core_scsi3_put_pr_reg(pr_reg);
2492                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2493                 }
2494                 /*
2495                  * From spc4r17 Section 5.7.9: Reserving:
2496                  *
2497                  * If the device server receives a PERSISTENT RESERVE OUT
2498                  * command with RESERVE service action where the TYPE field and
2499                  * the SCOPE field contain the same values as the existing type
2500                  * and scope from a persistent reservation holder, it shall not
2501                  * make any change to the existing persistent reservation and
2502                  * shall completethe command with GOOD status.
2503                  */
2504                 spin_unlock(&dev->dev_reservation_lock);
2505                 core_scsi3_put_pr_reg(pr_reg);
2506                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2507         }
2508         /*
2509          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2510          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2511          */
2512         pr_reg->pr_res_scope = scope;
2513         pr_reg->pr_res_type = type;
2514         pr_reg->pr_res_holder = 1;
2515         dev->dev_pr_res_holder = pr_reg;
2516         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2517                                 PR_REG_ISID_ID_LEN);
2518
2519         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2520                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2521                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2522                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2523         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2524                         cmd->se_tfo->get_fabric_name(),
2525                         se_sess->se_node_acl->initiatorname,
2526                         (prf_isid) ? &i_buf[0] : "");
2527         spin_unlock(&dev->dev_reservation_lock);
2528
2529         if (pr_tmpl->pr_aptpl_active) {
2530                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2531                                 &pr_reg->pr_aptpl_buf[0],
2532                                 pr_tmpl->pr_aptpl_buf_len);
2533                 if (!ret)
2534                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2535                                         " for RESERVE\n");
2536         }
2537
2538         core_scsi3_put_pr_reg(pr_reg);
2539         return 0;
2540 }
2541
2542 static int core_scsi3_emulate_pro_reserve(
2543         struct se_cmd *cmd,
2544         int type,
2545         int scope,
2546         u64 res_key)
2547 {
2548         struct se_device *dev = cmd->se_dev;
2549         int ret = 0;
2550
2551         switch (type) {
2552         case PR_TYPE_WRITE_EXCLUSIVE:
2553         case PR_TYPE_EXCLUSIVE_ACCESS:
2554         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2555         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2556         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2557         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2558                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2559                 break;
2560         default:
2561                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2562                         " 0x%02x\n", type);
2563                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2564         }
2565
2566         return ret;
2567 }
2568
2569 /*
2570  * Called with struct se_device->dev_reservation_lock held.
2571  */
2572 static void __core_scsi3_complete_pro_release(
2573         struct se_device *dev,
2574         struct se_node_acl *se_nacl,
2575         struct t10_pr_registration *pr_reg,
2576         int explict)
2577 {
2578         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2579         char i_buf[PR_REG_ISID_ID_LEN];
2580         int prf_isid;
2581
2582         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2583         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2584                                 PR_REG_ISID_ID_LEN);
2585         /*
2586          * Go ahead and release the current PR reservation holder.
2587          */
2588         dev->dev_pr_res_holder = NULL;
2589
2590         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2591                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2592                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2593                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2594                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2595         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2596                 tfo->get_fabric_name(), se_nacl->initiatorname,
2597                 (prf_isid) ? &i_buf[0] : "");
2598         /*
2599          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2600          */
2601         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2602 }
2603
2604 static int core_scsi3_emulate_pro_release(
2605         struct se_cmd *cmd,
2606         int type,
2607         int scope,
2608         u64 res_key)
2609 {
2610         struct se_device *dev = cmd->se_dev;
2611         struct se_session *se_sess = cmd->se_sess;
2612         struct se_lun *se_lun = cmd->se_lun;
2613         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2614         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2615         int ret, all_reg = 0;
2616
2617         if (!se_sess || !se_lun) {
2618                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2619                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2620         }
2621         /*
2622          * Locate the existing *pr_reg via struct se_node_acl pointers
2623          */
2624         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2625         if (!pr_reg) {
2626                 pr_err("SPC-3 PR: Unable to locate"
2627                         " PR_REGISTERED *pr_reg for RELEASE\n");
2628                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2629         }
2630         /*
2631          * From spc4r17 Section 5.7.11.2 Releasing:
2632          *
2633          * If there is no persistent reservation or in response to a persistent
2634          * reservation release request from a registered I_T nexus that is not a
2635          * persistent reservation holder (see 5.7.10), the device server shall
2636          * do the following:
2637          *
2638          *     a) Not release the persistent reservation, if any;
2639          *     b) Not remove any registrations; and
2640          *     c) Complete the command with GOOD status.
2641          */
2642         spin_lock(&dev->dev_reservation_lock);
2643         pr_res_holder = dev->dev_pr_res_holder;
2644         if (!pr_res_holder) {
2645                 /*
2646                  * No persistent reservation, return GOOD status.
2647                  */
2648                 spin_unlock(&dev->dev_reservation_lock);
2649                 core_scsi3_put_pr_reg(pr_reg);
2650                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2651         }
2652         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2653             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2654                 all_reg = 1;
2655
2656         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2657                 /*
2658                  * Non 'All Registrants' PR Type cases..
2659                  * Release request from a registered I_T nexus that is not a
2660                  * persistent reservation holder. return GOOD status.
2661                  */
2662                 spin_unlock(&dev->dev_reservation_lock);
2663                 core_scsi3_put_pr_reg(pr_reg);
2664                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2665         }
2666         /*
2667          * From spc4r17 Section 5.7.11.2 Releasing:
2668          *
2669          * Only the persistent reservation holder (see 5.7.10) is allowed to
2670          * release a persistent reservation.
2671          *
2672          * An application client releases the persistent reservation by issuing
2673          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2674          * an I_T nexus that is a persistent reservation holder with the
2675          * following parameters:
2676          *
2677          *     a) RESERVATION KEY field set to the value of the reservation key
2678          *        that is registered with the logical unit for the I_T nexus;
2679          */
2680         if (res_key != pr_reg->pr_res_key) {
2681                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2682                         " does not match existing SA REGISTER res_key:"
2683                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2684                 spin_unlock(&dev->dev_reservation_lock);
2685                 core_scsi3_put_pr_reg(pr_reg);
2686                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2687         }
2688         /*
2689          * From spc4r17 Section 5.7.11.2 Releasing and above:
2690          *
2691          * b) TYPE field and SCOPE field set to match the persistent
2692          *    reservation being released.
2693          */
2694         if ((pr_res_holder->pr_res_type != type) ||
2695             (pr_res_holder->pr_res_scope != scope)) {
2696                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2697                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2698                         " reservation from [%s]: %s with different TYPE "
2699                         "and/or SCOPE  while reservation already held by"
2700                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2701                         cmd->se_tfo->get_fabric_name(),
2702                         se_sess->se_node_acl->initiatorname,
2703                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2704                         pr_res_holder->pr_reg_nacl->initiatorname);
2705
2706                 spin_unlock(&dev->dev_reservation_lock);
2707                 core_scsi3_put_pr_reg(pr_reg);
2708                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2709         }
2710         /*
2711          * In response to a persistent reservation release request from the
2712          * persistent reservation holder the device server shall perform a
2713          * release by doing the following as an uninterrupted series of actions:
2714          * a) Release the persistent reservation;
2715          * b) Not remove any registration(s);
2716          * c) If the released persistent reservation is a registrants only type
2717          * or all registrants type persistent reservation,
2718          *    the device server shall establish a unit attention condition for
2719          *    the initiator port associated with every regis-
2720          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2721          *    RESERVE OUT command with RELEASE service action was received,
2722          *    with the additional sense code set to RESERVATIONS RELEASED; and
2723          * d) If the persistent reservation is of any other type, the device
2724          *    server shall not establish a unit attention condition.
2725          */
2726         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2727                         pr_reg, 1);
2728
2729         spin_unlock(&dev->dev_reservation_lock);
2730
2731         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2732             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2733             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2734             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2735                 /*
2736                  * If no UNIT ATTENTION conditions will be established for
2737                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2738                  * go ahead and check for APTPL=1 update+write below
2739                  */
2740                 goto write_aptpl;
2741         }
2742
2743         spin_lock(&pr_tmpl->registration_lock);
2744         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2745                         pr_reg_list) {
2746                 /*
2747                  * Do not establish a UNIT ATTENTION condition
2748                  * for the calling I_T Nexus
2749                  */
2750                 if (pr_reg_p == pr_reg)
2751                         continue;
2752
2753                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2754                                 pr_reg_p->pr_res_mapped_lun,
2755                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2756         }
2757         spin_unlock(&pr_tmpl->registration_lock);
2758
2759 write_aptpl:
2760         if (pr_tmpl->pr_aptpl_active) {
2761                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2762                                 &pr_reg->pr_aptpl_buf[0],
2763                                 pr_tmpl->pr_aptpl_buf_len);
2764                 if (!ret)
2765                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2766         }
2767
2768         core_scsi3_put_pr_reg(pr_reg);
2769         return 0;
2770 }
2771
2772 static int core_scsi3_emulate_pro_clear(
2773         struct se_cmd *cmd,
2774         u64 res_key)
2775 {
2776         struct se_device *dev = cmd->se_dev;
2777         struct se_node_acl *pr_reg_nacl;
2778         struct se_session *se_sess = cmd->se_sess;
2779         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2780         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2781         u32 pr_res_mapped_lun = 0;
2782         int calling_it_nexus = 0;
2783         /*
2784          * Locate the existing *pr_reg via struct se_node_acl pointers
2785          */
2786         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2787                         se_sess->se_node_acl, se_sess);
2788         if (!pr_reg_n) {
2789                 pr_err("SPC-3 PR: Unable to locate"
2790                         " PR_REGISTERED *pr_reg for CLEAR\n");
2791                         return PYX_TRANSPORT_LU_COMM_FAILURE;
2792         }
2793         /*
2794          * From spc4r17 section 5.7.11.6, Clearing:
2795          *
2796          * Any application client may release the persistent reservation and
2797          * remove all registrations from a device server by issuing a
2798          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2799          * registered I_T nexus with the following parameter:
2800          *
2801          *      a) RESERVATION KEY field set to the value of the reservation key
2802          *         that is registered with the logical unit for the I_T nexus.
2803          */
2804         if (res_key != pr_reg_n->pr_res_key) {
2805                 pr_err("SPC-3 PR REGISTER: Received"
2806                         " res_key: 0x%016Lx does not match"
2807                         " existing SA REGISTER res_key:"
2808                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2809                 core_scsi3_put_pr_reg(pr_reg_n);
2810                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2811         }
2812         /*
2813          * a) Release the persistent reservation, if any;
2814          */
2815         spin_lock(&dev->dev_reservation_lock);
2816         pr_res_holder = dev->dev_pr_res_holder;
2817         if (pr_res_holder) {
2818                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2819                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2820                         pr_res_holder, 0);
2821         }
2822         spin_unlock(&dev->dev_reservation_lock);
2823         /*
2824          * b) Remove all registration(s) (see spc4r17 5.7.7);
2825          */
2826         spin_lock(&pr_tmpl->registration_lock);
2827         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2828                         &pr_tmpl->registration_list, pr_reg_list) {
2829
2830                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2831                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2832                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2833                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2834                                         calling_it_nexus);
2835                 /*
2836                  * e) Establish a unit attention condition for the initiator
2837                  *    port associated with every registered I_T nexus other
2838                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2839                  *    command with CLEAR service action was received, with the
2840                  *    additional sense code set to RESERVATIONS PREEMPTED.
2841                  */
2842                 if (!calling_it_nexus)
2843                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2844                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2845         }
2846         spin_unlock(&pr_tmpl->registration_lock);
2847
2848         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2849                 cmd->se_tfo->get_fabric_name());
2850
2851         if (pr_tmpl->pr_aptpl_active) {
2852                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2853                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2854                                 " for CLEAR\n");
2855         }
2856
2857         core_scsi3_pr_generation(dev);
2858         return 0;
2859 }
2860
2861 /*
2862  * Called with struct se_device->dev_reservation_lock held.
2863  */
2864 static void __core_scsi3_complete_pro_preempt(
2865         struct se_device *dev,
2866         struct t10_pr_registration *pr_reg,
2867         struct list_head *preempt_and_abort_list,
2868         int type,
2869         int scope,
2870         int abort)
2871 {
2872         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2873         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2874         char i_buf[PR_REG_ISID_ID_LEN];
2875         int prf_isid;
2876
2877         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2878         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2879                                 PR_REG_ISID_ID_LEN);
2880         /*
2881          * Do an implict RELEASE of the existing reservation.
2882          */
2883         if (dev->dev_pr_res_holder)
2884                 __core_scsi3_complete_pro_release(dev, nacl,
2885                                 dev->dev_pr_res_holder, 0);
2886
2887         dev->dev_pr_res_holder = pr_reg;
2888         pr_reg->pr_res_holder = 1;
2889         pr_reg->pr_res_type = type;
2890         pr_reg->pr_res_scope = scope;
2891
2892         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2893                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2894                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2895                 core_scsi3_pr_dump_type(type),
2896                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2897         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2898                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2899                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2900         /*
2901          * For PREEMPT_AND_ABORT, add the preempting reservation's
2902          * struct t10_pr_registration to the list that will be compared
2903          * against received CDBs..
2904          */
2905         if (preempt_and_abort_list)
2906                 list_add_tail(&pr_reg->pr_reg_abort_list,
2907                                 preempt_and_abort_list);
2908 }
2909
2910 static void core_scsi3_release_preempt_and_abort(
2911         struct list_head *preempt_and_abort_list,
2912         struct t10_pr_registration *pr_reg_holder)
2913 {
2914         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2915
2916         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2917                                 pr_reg_abort_list) {
2918
2919                 list_del(&pr_reg->pr_reg_abort_list);
2920                 if (pr_reg_holder == pr_reg)
2921                         continue;
2922                 if (pr_reg->pr_res_holder) {
2923                         pr_warn("pr_reg->pr_res_holder still set\n");
2924                         continue;
2925                 }
2926
2927                 pr_reg->pr_reg_deve = NULL;
2928                 pr_reg->pr_reg_nacl = NULL;
2929                 kfree(pr_reg->pr_aptpl_buf);
2930                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2931         }
2932 }
2933
2934 int core_scsi3_check_cdb_abort_and_preempt(
2935         struct list_head *preempt_and_abort_list,
2936         struct se_cmd *cmd)
2937 {
2938         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2939
2940         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2941                                 pr_reg_abort_list) {
2942                 if (pr_reg->pr_res_key == cmd->pr_res_key)
2943                         return 0;
2944         }
2945
2946         return 1;
2947 }
2948
2949 static int core_scsi3_pro_preempt(
2950         struct se_cmd *cmd,
2951         int type,
2952         int scope,
2953         u64 res_key,
2954         u64 sa_res_key,
2955         int abort)
2956 {
2957         struct se_device *dev = cmd->se_dev;
2958         struct se_dev_entry *se_deve;
2959         struct se_node_acl *pr_reg_nacl;
2960         struct se_session *se_sess = cmd->se_sess;
2961         struct list_head preempt_and_abort_list;
2962         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2963         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2964         u32 pr_res_mapped_lun = 0;
2965         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2966         int prh_type = 0, prh_scope = 0, ret;
2967
2968         if (!se_sess)
2969                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2970
2971         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2972         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2973                                 se_sess);
2974         if (!pr_reg_n) {
2975                 pr_err("SPC-3 PR: Unable to locate"
2976                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2977                         (abort) ? "_AND_ABORT" : "");
2978                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2979         }
2980         if (pr_reg_n->pr_res_key != res_key) {
2981                 core_scsi3_put_pr_reg(pr_reg_n);
2982                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2983         }
2984         if (scope != PR_SCOPE_LU_SCOPE) {
2985                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2986                 core_scsi3_put_pr_reg(pr_reg_n);
2987                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2988         }
2989         INIT_LIST_HEAD(&preempt_and_abort_list);
2990
2991         spin_lock(&dev->dev_reservation_lock);
2992         pr_res_holder = dev->dev_pr_res_holder;
2993         if (pr_res_holder &&
2994            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2995             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2996                 all_reg = 1;
2997
2998         if (!all_reg && !sa_res_key) {
2999                 spin_unlock(&dev->dev_reservation_lock);
3000                 core_scsi3_put_pr_reg(pr_reg_n);
3001                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3002         }
3003         /*
3004          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3005          *
3006          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3007          * persistent reservation holder or there is no persistent reservation
3008          * holder (i.e., there is no persistent reservation), then the device
3009          * server shall perform a preempt by doing the following in an
3010          * uninterrupted series of actions. (See below..)
3011          */
3012         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3013                 /*
3014                  * No existing or SA Reservation Key matching reservations..
3015                  *
3016                  * PROUT SA PREEMPT with All Registrant type reservations are
3017                  * allowed to be processed without a matching SA Reservation Key
3018                  */
3019                 spin_lock(&pr_tmpl->registration_lock);
3020                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3021                                 &pr_tmpl->registration_list, pr_reg_list) {
3022                         /*
3023                          * Removing of registrations in non all registrants
3024                          * type reservations without a matching SA reservation
3025                          * key.
3026                          *
3027                          * a) Remove the registrations for all I_T nexuses
3028                          *    specified by the SERVICE ACTION RESERVATION KEY
3029                          *    field;
3030                          * b) Ignore the contents of the SCOPE and TYPE fields;
3031                          * c) Process tasks as defined in 5.7.1; and
3032                          * d) Establish a unit attention condition for the
3033                          *    initiator port associated with every I_T nexus
3034                          *    that lost its registration other than the I_T
3035                          *    nexus on which the PERSISTENT RESERVE OUT command
3036                          *    was received, with the additional sense code set
3037                          *    to REGISTRATIONS PREEMPTED.
3038                          */
3039                         if (!all_reg) {
3040                                 if (pr_reg->pr_res_key != sa_res_key)
3041                                         continue;
3042
3043                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3044                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3045                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3046                                 __core_scsi3_free_registration(dev, pr_reg,
3047                                         (abort) ? &preempt_and_abort_list :
3048                                                 NULL, calling_it_nexus);
3049                                 released_regs++;
3050                         } else {
3051                                 /*
3052                                  * Case for any existing all registrants type
3053                                  * reservation, follow logic in spc4r17 section
3054                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3055                                  *
3056                                  * For a ZERO SA Reservation key, release
3057                                  * all other registrations and do an implict
3058                                  * release of active persistent reservation.
3059                                  *
3060                                  * For a non-ZERO SA Reservation key, only
3061                                  * release the matching reservation key from
3062                                  * registrations.
3063                                  */
3064                                 if ((sa_res_key) &&
3065                                      (pr_reg->pr_res_key != sa_res_key))
3066                                         continue;
3067
3068                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3069                                 if (calling_it_nexus)
3070                                         continue;
3071
3072                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3073                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3074                                 __core_scsi3_free_registration(dev, pr_reg,
3075                                         (abort) ? &preempt_and_abort_list :
3076                                                 NULL, 0);
3077                                 released_regs++;
3078                         }
3079                         if (!calling_it_nexus)
3080                                 core_scsi3_ua_allocate(pr_reg_nacl,
3081                                         pr_res_mapped_lun, 0x2A,
3082                                         ASCQ_2AH_RESERVATIONS_PREEMPTED);
3083                 }
3084                 spin_unlock(&pr_tmpl->registration_lock);
3085                 /*
3086                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3087                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3088                  * RESERVATION KEY field to a value that does not match any
3089                  * registered reservation key, then the device server shall
3090                  * complete the command with RESERVATION CONFLICT status.
3091                  */
3092                 if (!released_regs) {
3093                         spin_unlock(&dev->dev_reservation_lock);
3094                         core_scsi3_put_pr_reg(pr_reg_n);
3095                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
3096                 }
3097                 /*
3098                  * For an existing all registrants type reservation
3099                  * with a zero SA rservation key, preempt the existing
3100                  * reservation with the new PR type and scope.
3101                  */
3102                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3103                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3104                                 (abort) ? &preempt_and_abort_list : NULL,
3105                                 type, scope, abort);
3106
3107                         if (abort)
3108                                 core_scsi3_release_preempt_and_abort(
3109                                         &preempt_and_abort_list, pr_reg_n);
3110                 }
3111                 spin_unlock(&dev->dev_reservation_lock);
3112
3113                 if (pr_tmpl->pr_aptpl_active) {
3114                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3115                                         &pr_reg_n->pr_aptpl_buf[0],
3116                                         pr_tmpl->pr_aptpl_buf_len);
3117                         if (!ret)
3118                                 pr_debug("SPC-3 PR: Updated APTPL"
3119                                         " metadata for  PREEMPT%s\n", (abort) ?
3120                                         "_AND_ABORT" : "");
3121                 }
3122
3123                 core_scsi3_put_pr_reg(pr_reg_n);
3124                 core_scsi3_pr_generation(cmd->se_dev);
3125                 return 0;
3126         }
3127         /*
3128          * The PREEMPTing SA reservation key matches that of the
3129          * existing persistent reservation, first, we check if
3130          * we are preempting our own reservation.
3131          * From spc4r17, section 5.7.11.4.3 Preempting
3132          * persistent reservations and registration handling
3133          *
3134          * If an all registrants persistent reservation is not
3135          * present, it is not an error for the persistent
3136          * reservation holder to preempt itself (i.e., a
3137          * PERSISTENT RESERVE OUT with a PREEMPT service action
3138          * or a PREEMPT AND ABORT service action with the
3139          * SERVICE ACTION RESERVATION KEY value equal to the
3140          * persistent reservation holder's reservation key that
3141          * is received from the persistent reservation holder).
3142          * In that case, the device server shall establish the
3143          * new persistent reservation and maintain the
3144          * registration.
3145          */
3146         prh_type = pr_res_holder->pr_res_type;
3147         prh_scope = pr_res_holder->pr_res_scope;
3148         /*
3149          * If the SERVICE ACTION RESERVATION KEY field identifies a
3150          * persistent reservation holder (see 5.7.10), the device
3151          * server shall perform a preempt by doing the following as
3152          * an uninterrupted series of actions:
3153          *
3154          * a) Release the persistent reservation for the holder
3155          *    identified by the SERVICE ACTION RESERVATION KEY field;
3156          */
3157         if (pr_reg_n != pr_res_holder)
3158                 __core_scsi3_complete_pro_release(dev,
3159                                 pr_res_holder->pr_reg_nacl,
3160                                 dev->dev_pr_res_holder, 0);
3161         /*
3162          * b) Remove the registrations for all I_T nexuses identified
3163          *    by the SERVICE ACTION RESERVATION KEY field, except the
3164          *    I_T nexus that is being used for the PERSISTENT RESERVE
3165          *    OUT command. If an all registrants persistent reservation
3166          *    is present and the SERVICE ACTION RESERVATION KEY field
3167          *    is set to zero, then all registrations shall be removed
3168          *    except for that of the I_T nexus that is being used for
3169          *    the PERSISTENT RESERVE OUT command;
3170          */
3171         spin_lock(&pr_tmpl->registration_lock);
3172         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3173                         &pr_tmpl->registration_list, pr_reg_list) {
3174
3175                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3176                 if (calling_it_nexus)
3177                         continue;
3178
3179                 if (pr_reg->pr_res_key != sa_res_key)
3180                         continue;
3181
3182                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3183                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3184                 __core_scsi3_free_registration(dev, pr_reg,
3185                                 (abort) ? &preempt_and_abort_list : NULL,
3186                                 calling_it_nexus);
3187                 /*
3188                  * e) Establish a unit attention condition for the initiator
3189                  *    port associated with every I_T nexus that lost its
3190                  *    persistent reservation and/or registration, with the
3191                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3192                  */
3193                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3194                                 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3195         }
3196         spin_unlock(&pr_tmpl->registration_lock);
3197         /*
3198          * c) Establish a persistent reservation for the preempting
3199          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3200          */
3201         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3202                         (abort) ? &preempt_and_abort_list : NULL,
3203                         type, scope, abort);
3204         /*
3205          * d) Process tasks as defined in 5.7.1;
3206          * e) See above..
3207          * f) If the type or scope has changed, then for every I_T nexus
3208          *    whose reservation key was not removed, except for the I_T
3209          *    nexus on which the PERSISTENT RESERVE OUT command was
3210          *    received, the device server shall establish a unit
3211          *    attention condition for the initiator port associated with
3212          *    that I_T nexus, with the additional sense code set to
3213          *    RESERVATIONS RELEASED. If the type or scope have not
3214          *    changed, then no unit attention condition(s) shall be
3215          *    established for this reason.
3216          */
3217         if ((prh_type != type) || (prh_scope != scope)) {
3218                 spin_lock(&pr_tmpl->registration_lock);
3219                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3220                                 &pr_tmpl->registration_list, pr_reg_list) {
3221
3222                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3223                         if (calling_it_nexus)
3224                                 continue;
3225
3226                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3227                                         pr_reg->pr_res_mapped_lun, 0x2A,
3228                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3229                 }
3230                 spin_unlock(&pr_tmpl->registration_lock);
3231         }
3232         spin_unlock(&dev->dev_reservation_lock);
3233         /*
3234          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3235          * All received CDBs for the matching existing reservation and
3236          * registrations undergo ABORT_TASK logic.
3237          *
3238          * From there, core_scsi3_release_preempt_and_abort() will
3239          * release every registration in the list (which have already
3240          * been removed from the primary pr_reg list), except the
3241          * new persistent reservation holder, the calling Initiator Port.
3242          */
3243         if (abort) {
3244                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3245                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3246                                                 pr_reg_n);
3247         }
3248
3249         if (pr_tmpl->pr_aptpl_active) {
3250                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3251                                 &pr_reg_n->pr_aptpl_buf[0],
3252                                 pr_tmpl->pr_aptpl_buf_len);
3253                 if (!ret)
3254                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3255                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3256         }
3257
3258         core_scsi3_put_pr_reg(pr_reg_n);
3259         core_scsi3_pr_generation(cmd->se_dev);
3260         return 0;
3261 }
3262
3263 static int core_scsi3_emulate_pro_preempt(
3264         struct se_cmd *cmd,
3265         int type,
3266         int scope,
3267         u64 res_key,
3268         u64 sa_res_key,
3269         int abort)
3270 {
3271         int ret = 0;
3272
3273         switch (type) {
3274         case PR_TYPE_WRITE_EXCLUSIVE:
3275         case PR_TYPE_EXCLUSIVE_ACCESS:
3276         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3277         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3278         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3279         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3280                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3281                                 res_key, sa_res_key, abort);
3282                 break;
3283         default:
3284                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3285                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3286                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3287         }
3288
3289         return ret;
3290 }
3291
3292
3293 static int core_scsi3_emulate_pro_register_and_move(
3294         struct se_cmd *cmd,
3295         u64 res_key,
3296         u64 sa_res_key,
3297         int aptpl,
3298         int unreg)
3299 {
3300         struct se_session *se_sess = cmd->se_sess;
3301         struct se_device *dev = cmd->se_dev;
3302         struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3303         struct se_lun *se_lun = cmd->se_lun;
3304         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3305         struct se_port *se_port;
3306         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3307         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3308         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3309         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3310         unsigned char *buf;
3311         unsigned char *initiator_str;
3312         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3313         u32 tid_len, tmp_tid_len;
3314         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3315         unsigned short rtpi;
3316         unsigned char proto_ident;
3317
3318         if (!se_sess || !se_lun) {
3319                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3320                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3321         }
3322         memset(dest_iport, 0, 64);
3323         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3324         se_tpg = se_sess->se_tpg;
3325         tf_ops = se_tpg->se_tpg_tfo;
3326         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3327         /*
3328          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3329          *      Register behaviors for a REGISTER AND MOVE service action
3330          *
3331          * Locate the existing *pr_reg via struct se_node_acl pointers
3332          */
3333         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3334                                 se_sess);
3335         if (!pr_reg) {
3336                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3337                         " *pr_reg for REGISTER_AND_MOVE\n");
3338                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3339         }
3340         /*
3341          * The provided reservation key much match the existing reservation key
3342          * provided during this initiator's I_T nexus registration.
3343          */
3344         if (res_key != pr_reg->pr_res_key) {
3345                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3346                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3347                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3348                 core_scsi3_put_pr_reg(pr_reg);
3349                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3350         }
3351         /*
3352          * The service active reservation key needs to be non zero
3353          */
3354         if (!sa_res_key) {
3355                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3356                         " sa_res_key\n");
3357                 core_scsi3_put_pr_reg(pr_reg);
3358                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3359         }
3360
3361         /*
3362          * Determine the Relative Target Port Identifier where the reservation
3363          * will be moved to for the TransportID containing SCSI initiator WWN
3364          * information.
3365          */
3366         buf = transport_kmap_first_data_page(cmd);
3367         rtpi = (buf[18] & 0xff) << 8;
3368         rtpi |= buf[19] & 0xff;
3369         tid_len = (buf[20] & 0xff) << 24;
3370         tid_len |= (buf[21] & 0xff) << 16;
3371         tid_len |= (buf[22] & 0xff) << 8;
3372         tid_len |= buf[23] & 0xff;
3373         transport_kunmap_first_data_page(cmd);
3374         buf = NULL;
3375
3376         if ((tid_len + 24) != cmd->data_length) {
3377                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3378                         " does not equal CDB data_length: %u\n", tid_len,
3379                         cmd->data_length);
3380                 core_scsi3_put_pr_reg(pr_reg);
3381                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3382         }
3383
3384         spin_lock(&dev->se_port_lock);
3385         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3386                 if (se_port->sep_rtpi != rtpi)
3387                         continue;
3388                 dest_se_tpg = se_port->sep_tpg;
3389                 if (!dest_se_tpg)
3390                         continue;
3391                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3392                 if (!dest_tf_ops)
3393                         continue;
3394
3395                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3396                 smp_mb__after_atomic_inc();
3397                 spin_unlock(&dev->se_port_lock);
3398
3399                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3400                 if (ret != 0) {
3401                         pr_err("core_scsi3_tpg_depend_item() failed"
3402                                 " for dest_se_tpg\n");
3403                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3404                         smp_mb__after_atomic_dec();
3405                         core_scsi3_put_pr_reg(pr_reg);
3406                         return PYX_TRANSPORT_LU_COMM_FAILURE;
3407                 }
3408
3409                 spin_lock(&dev->se_port_lock);
3410                 break;
3411         }
3412         spin_unlock(&dev->se_port_lock);
3413
3414         if (!dest_se_tpg || !dest_tf_ops) {
3415                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3416                         " fabric ops from Relative Target Port Identifier:"
3417                         " %hu\n", rtpi);
3418                 core_scsi3_put_pr_reg(pr_reg);
3419                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3420         }
3421
3422         buf = transport_kmap_first_data_page(cmd);
3423         proto_ident = (buf[24] & 0x0f);
3424 #if 0
3425         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3426                         " 0x%02x\n", proto_ident);
3427 #endif
3428         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3429                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3430                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3431                         " from fabric: %s\n", proto_ident,
3432                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3433                         dest_tf_ops->get_fabric_name());
3434                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3435                 goto out;
3436         }
3437         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3438                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3439                         " containg a valid tpg_parse_pr_out_transport_id"
3440                         " function pointer\n");
3441                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3442                 goto out;
3443         }
3444         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3445                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3446         if (!initiator_str) {
3447                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3448                         " initiator_str from Transport ID\n");
3449                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3450                 goto out;
3451         }
3452
3453         transport_kunmap_first_data_page(cmd);
3454         buf = NULL;
3455
3456         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3457                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3458                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3459                 iport_ptr : "");
3460         /*
3461          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3462          * action specifies a TransportID that is the same as the initiator port
3463          * of the I_T nexus for the command received, then the command shall
3464          * be terminated with CHECK CONDITION status, with the sense key set to
3465          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3466          * IN PARAMETER LIST.
3467          */
3468         pr_reg_nacl = pr_reg->pr_reg_nacl;
3469         matching_iname = (!strcmp(initiator_str,
3470                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3471         if (!matching_iname)
3472                 goto after_iport_check;
3473
3474         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3475                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3476                         " matches: %s on received I_T Nexus\n", initiator_str,
3477                         pr_reg_nacl->initiatorname);
3478                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3479                 goto out;
3480         }
3481         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3482                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3483                         " matches: %s %s on received I_T Nexus\n",
3484                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3485                         pr_reg->pr_reg_isid);
3486                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3487                 goto out;
3488         }
3489 after_iport_check:
3490         /*
3491          * Locate the destination struct se_node_acl from the received Transport ID
3492          */
3493         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3494         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3495                                 initiator_str);
3496         if (dest_node_acl) {
3497                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3498                 smp_mb__after_atomic_inc();
3499         }
3500         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3501
3502         if (!dest_node_acl) {
3503                 pr_err("Unable to locate %s dest_node_acl for"
3504                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3505                         initiator_str);
3506                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3507                 goto out;
3508         }
3509         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3510         if (ret != 0) {
3511                 pr_err("core_scsi3_nodeacl_depend_item() for"
3512                         " dest_node_acl\n");
3513                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3514                 smp_mb__after_atomic_dec();
3515                 dest_node_acl = NULL;
3516                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3517                 goto out;
3518         }
3519 #if 0
3520         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3521                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3522                 dest_node_acl->initiatorname);
3523 #endif
3524         /*
3525          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3526          * PORT IDENTIFIER.
3527          */
3528         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3529         if (!dest_se_deve) {
3530                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3531                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3532                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3533                 goto out;
3534         }
3535
3536         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3537         if (ret < 0) {
3538                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3539                 atomic_dec(&dest_se_deve->pr_ref_count);
3540                 smp_mb__after_atomic_dec();
3541                 dest_se_deve = NULL;
3542                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3543                 goto out;
3544         }
3545 #if 0
3546         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3547                 " ACL for dest_se_deve->mapped_lun: %u\n",
3548                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3549                 dest_se_deve->mapped_lun);
3550 #endif
3551         /*
3552          * A persistent reservation needs to already existing in order to
3553          * successfully complete the REGISTER_AND_MOVE service action..
3554          */
3555         spin_lock(&dev->dev_reservation_lock);
3556         pr_res_holder = dev->dev_pr_res_holder;
3557         if (!pr_res_holder) {
3558                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3559                         " currently held\n");
3560                 spin_unlock(&dev->dev_reservation_lock);
3561                 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3562                 goto out;
3563         }
3564         /*
3565          * The received on I_T Nexus must be the reservation holder.
3566          *
3567          * From spc4r17 section 5.7.8  Table 50 --
3568          *      Register behaviors for a REGISTER AND MOVE service action
3569          */
3570         if (pr_res_holder != pr_reg) {
3571                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3572                         " Nexus is not reservation holder\n");
3573                 spin_unlock(&dev->dev_reservation_lock);
3574                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3575                 goto out;
3576         }
3577         /*
3578          * From spc4r17 section 5.7.8: registering and moving reservation
3579          *
3580          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3581          * action is received and the established persistent reservation is a
3582          * Write Exclusive - All Registrants type or Exclusive Access -
3583          * All Registrants type reservation, then the command shall be completed
3584          * with RESERVATION CONFLICT status.
3585          */
3586         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3587             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3588                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3589                         " reservation for type: %s\n",
3590                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3591                 spin_unlock(&dev->dev_reservation_lock);
3592                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3593                 goto out;
3594         }
3595         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3596         /*
3597          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3598          */
3599         type = pr_res_holder->pr_res_type;
3600         scope = pr_res_holder->pr_res_type;
3601         /*
3602          * c) Associate the reservation key specified in the SERVICE ACTION
3603          *    RESERVATION KEY field with the I_T nexus specified as the
3604          *    destination of the register and move, where:
3605          *    A) The I_T nexus is specified by the TransportID and the
3606          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3607          *    B) Regardless of the TransportID format used, the association for
3608          *       the initiator port is based on either the initiator port name
3609          *       (see 3.1.71) on SCSI transport protocols where port names are
3610          *       required or the initiator port identifier (see 3.1.70) on SCSI
3611          *       transport protocols where port names are not required;
3612          * d) Register the reservation key specified in the SERVICE ACTION
3613          *    RESERVATION KEY field;
3614          * e) Retain the reservation key specified in the SERVICE ACTION
3615          *    RESERVATION KEY field and associated information;
3616          *
3617          * Also, It is not an error for a REGISTER AND MOVE service action to
3618          * register an I_T nexus that is already registered with the same
3619          * reservation key or a different reservation key.
3620          */
3621         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3622                                         iport_ptr);
3623         if (!dest_pr_reg) {
3624                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3625                                 dest_node_acl, dest_se_deve, iport_ptr,
3626                                 sa_res_key, 0, aptpl, 2, 1);
3627                 if (ret != 0) {
3628                         spin_unlock(&dev->dev_reservation_lock);
3629                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3630                         goto out;
3631                 }
3632                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3633                                                 iport_ptr);
3634                 new_reg = 1;
3635         }
3636         /*
3637          * f) Release the persistent reservation for the persistent reservation
3638          *    holder (i.e., the I_T nexus on which the
3639          */
3640         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3641                         dev->dev_pr_res_holder, 0);
3642         /*
3643          * g) Move the persistent reservation to the specified I_T nexus using
3644          *    the same scope and type as the persistent reservation released in
3645          *    item f); and
3646          */
3647         dev->dev_pr_res_holder = dest_pr_reg;
3648         dest_pr_reg->pr_res_holder = 1;
3649         dest_pr_reg->pr_res_type = type;
3650         pr_reg->pr_res_scope = scope;
3651         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3652                                 PR_REG_ISID_ID_LEN);
3653         /*
3654          * Increment PRGeneration for existing registrations..
3655          */
3656         if (!new_reg)
3657                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3658         spin_unlock(&dev->dev_reservation_lock);
3659
3660         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3661                 " created new reservation holder TYPE: %s on object RTPI:"
3662                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3663                 core_scsi3_pr_dump_type(type), rtpi,
3664                 dest_pr_reg->pr_res_generation);
3665         pr_debug("SPC-3 PR Successfully moved reservation from"
3666                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3667                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3668                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3669                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3670                 iport_ptr : "");
3671         /*
3672          * It is now safe to release configfs group dependencies for destination
3673          * of Transport ID Initiator Device/Port Identifier
3674          */
3675         core_scsi3_lunacl_undepend_item(dest_se_deve);
3676         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3677         core_scsi3_tpg_undepend_item(dest_se_tpg);
3678         /*
3679          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3680          * nexus on which PERSISTENT RESERVE OUT command was received.
3681          */
3682         if (unreg) {
3683                 spin_lock(&pr_tmpl->registration_lock);
3684                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3685                 spin_unlock(&pr_tmpl->registration_lock);
3686         } else
3687                 core_scsi3_put_pr_reg(pr_reg);
3688
3689         /*
3690          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3691          * write out the updated metadata to struct file for this SCSI device.
3692          */
3693         if (!aptpl) {
3694                 pr_tmpl->pr_aptpl_active = 0;
3695                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3696                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3697                                 " REGISTER_AND_MOVE\n");
3698         } else {
3699                 pr_tmpl->pr_aptpl_active = 1;
3700                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3701                                 &dest_pr_reg->pr_aptpl_buf[0],
3702                                 pr_tmpl->pr_aptpl_buf_len);
3703                 if (!ret)
3704                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3705                                         " REGISTER_AND_MOVE\n");
3706         }
3707
3708         transport_kunmap_first_data_page(cmd);
3709
3710         core_scsi3_put_pr_reg(dest_pr_reg);
3711         return 0;
3712 out:
3713         if (buf)
3714                 transport_kunmap_first_data_page(cmd);
3715         if (dest_se_deve)
3716                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3717         if (dest_node_acl)
3718                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3719         core_scsi3_tpg_undepend_item(dest_se_tpg);
3720         core_scsi3_put_pr_reg(pr_reg);
3721         return ret;
3722 }
3723
3724 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3725 {
3726         unsigned int __v1, __v2;
3727
3728         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3729         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3730
3731         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3732 }
3733
3734 /*
3735  * See spc4r17 section 6.14 Table 170
3736  */
3737 static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
3738 {
3739         unsigned char *buf;
3740         u64 res_key, sa_res_key;
3741         int sa, scope, type, aptpl;
3742         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3743         /*
3744          * FIXME: A NULL struct se_session pointer means an this is not coming from
3745          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3746          */
3747         if (!cmd->se_sess)
3748                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3749
3750         if (cmd->data_length < 24) {
3751                 pr_warn("SPC-PR: Received PR OUT parameter list"
3752                         " length too small: %u\n", cmd->data_length);
3753                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3754         }
3755         /*
3756          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3757          */
3758         sa = (cdb[1] & 0x1f);
3759         scope = (cdb[2] & 0xf0);
3760         type = (cdb[2] & 0x0f);
3761
3762         buf = transport_kmap_first_data_page(cmd);
3763         /*
3764          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3765          */
3766         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3767         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3768         /*
3769          * REGISTER_AND_MOVE uses a different SA parameter list containing
3770          * SCSI TransportIDs.
3771          */
3772         if (sa != PRO_REGISTER_AND_MOVE) {
3773                 spec_i_pt = (buf[20] & 0x08);
3774                 all_tg_pt = (buf[20] & 0x04);
3775                 aptpl = (buf[20] & 0x01);
3776         } else {
3777                 aptpl = (buf[17] & 0x01);
3778                 unreg = (buf[17] & 0x02);
3779         }
3780         transport_kunmap_first_data_page(cmd);
3781         buf = NULL;
3782
3783         /*
3784          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3785          */
3786         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3787                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3788         /*
3789          * From spc4r17 section 6.14:
3790          *
3791          * If the SPEC_I_PT bit is set to zero, the service action is not
3792          * REGISTER AND MOVE, and the parameter list length is not 24, then
3793          * the command shall be terminated with CHECK CONDITION status, with
3794          * the sense key set to ILLEGAL REQUEST, and the additional sense
3795          * code set to PARAMETER LIST LENGTH ERROR.
3796          */
3797         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3798             (cmd->data_length != 24)) {
3799                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3800                         " list length: %u\n", cmd->data_length);
3801                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3802         }
3803         /*
3804          * (core_scsi3_emulate_pro_* function parameters
3805          * are defined by spc4r17 Table 174:
3806          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3807          */
3808         switch (sa) {
3809         case PRO_REGISTER:
3810                 return core_scsi3_emulate_pro_register(cmd,
3811                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3812         case PRO_RESERVE:
3813                 return core_scsi3_emulate_pro_reserve(cmd,
3814                         type, scope, res_key);
3815         case PRO_RELEASE:
3816                 return core_scsi3_emulate_pro_release(cmd,
3817                         type, scope, res_key);
3818         case PRO_CLEAR:
3819                 return core_scsi3_emulate_pro_clear(cmd, res_key);
3820         case PRO_PREEMPT:
3821                 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3822                                         res_key, sa_res_key, 0);
3823         case PRO_PREEMPT_AND_ABORT:
3824                 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3825                                         res_key, sa_res_key, 1);
3826         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3827                 return core_scsi3_emulate_pro_register(cmd,
3828                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3829         case PRO_REGISTER_AND_MOVE:
3830                 return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3831                                 sa_res_key, aptpl, unreg);
3832         default:
3833                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3834                         " action: 0x%02x\n", cdb[1] & 0x1f);
3835                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3836         }
3837
3838         return PYX_TRANSPORT_INVALID_CDB_FIELD;
3839 }
3840
3841 /*
3842  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3843  *
3844  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3845  */
3846 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3847 {
3848         struct se_device *se_dev = cmd->se_dev;
3849         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3850         struct t10_pr_registration *pr_reg;
3851         unsigned char *buf;
3852         u32 add_len = 0, off = 8;
3853
3854         if (cmd->data_length < 8) {
3855                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3856                         " too small\n", cmd->data_length);
3857                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3858         }
3859
3860         buf = transport_kmap_first_data_page(cmd);
3861         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3862         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3863         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3864         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3865
3866         spin_lock(&su_dev->t10_pr.registration_lock);
3867         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3868                         pr_reg_list) {
3869                 /*
3870                  * Check for overflow of 8byte PRI READ_KEYS payload and
3871                  * next reservation key list descriptor.
3872                  */
3873                 if ((add_len + 8) > (cmd->data_length - 8))
3874                         break;
3875
3876                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3877                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3878                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3879                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3880                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3881                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3882                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3883                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3884
3885                 add_len += 8;
3886         }
3887         spin_unlock(&su_dev->t10_pr.registration_lock);
3888
3889         buf[4] = ((add_len >> 24) & 0xff);
3890         buf[5] = ((add_len >> 16) & 0xff);
3891         buf[6] = ((add_len >> 8) & 0xff);
3892         buf[7] = (add_len & 0xff);
3893
3894         transport_kunmap_first_data_page(cmd);
3895
3896         return 0;
3897 }
3898
3899 /*
3900  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3901  *
3902  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3903  */
3904 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3905 {
3906         struct se_device *se_dev = cmd->se_dev;
3907         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3908         struct t10_pr_registration *pr_reg;
3909         unsigned char *buf;
3910         u64 pr_res_key;
3911         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3912
3913         if (cmd->data_length < 8) {
3914                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3915                         " too small\n", cmd->data_length);
3916                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3917         }
3918
3919         buf = transport_kmap_first_data_page(cmd);
3920         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3921         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3922         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3923         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3924
3925         spin_lock(&se_dev->dev_reservation_lock);
3926         pr_reg = se_dev->dev_pr_res_holder;
3927         if ((pr_reg)) {
3928                 /*
3929                  * Set the hardcoded Additional Length
3930                  */
3931                 buf[4] = ((add_len >> 24) & 0xff);
3932                 buf[5] = ((add_len >> 16) & 0xff);
3933                 buf[6] = ((add_len >> 8) & 0xff);
3934                 buf[7] = (add_len & 0xff);
3935
3936                 if (cmd->data_length < 22)
3937                         goto err;
3938
3939                 /*
3940                  * Set the Reservation key.
3941                  *
3942                  * From spc4r17, section 5.7.10:
3943                  * A persistent reservation holder has its reservation key
3944                  * returned in the parameter data from a PERSISTENT
3945                  * RESERVE IN command with READ RESERVATION service action as
3946                  * follows:
3947                  * a) For a persistent reservation of the type Write Exclusive
3948                  *    - All Registrants or Exclusive Access  All Regitrants,
3949                  *      the reservation key shall be set to zero; or
3950                  * b) For all other persistent reservation types, the
3951                  *    reservation key shall be set to the registered
3952                  *    reservation key for the I_T nexus that holds the
3953                  *    persistent reservation.
3954                  */
3955                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3956                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3957                         pr_res_key = 0;
3958                 else
3959                         pr_res_key = pr_reg->pr_res_key;
3960
3961                 buf[8] = ((pr_res_key >> 56) & 0xff);
3962                 buf[9] = ((pr_res_key >> 48) & 0xff);
3963                 buf[10] = ((pr_res_key >> 40) & 0xff);
3964                 buf[11] = ((pr_res_key >> 32) & 0xff);
3965                 buf[12] = ((pr_res_key >> 24) & 0xff);
3966                 buf[13] = ((pr_res_key >> 16) & 0xff);
3967                 buf[14] = ((pr_res_key >> 8) & 0xff);
3968                 buf[15] = (pr_res_key & 0xff);
3969                 /*
3970                  * Set the SCOPE and TYPE
3971                  */
3972                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3973                           (pr_reg->pr_res_type & 0x0f);
3974         }
3975
3976 err:
3977         spin_unlock(&se_dev->dev_reservation_lock);
3978         transport_kunmap_first_data_page(cmd);
3979
3980         return 0;
3981 }
3982
3983 /*
3984  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3985  *
3986  * See spc4r17 section 6.13.4 Table 165
3987  */
3988 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3989 {
3990         struct se_device *dev = cmd->se_dev;
3991         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3992         unsigned char *buf;
3993         u16 add_len = 8; /* Hardcoded to 8. */
3994
3995         if (cmd->data_length < 6) {
3996                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3997                         " %u too small\n", cmd->data_length);
3998                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3999         }
4000
4001         buf = transport_kmap_first_data_page(cmd);
4002
4003         buf[0] = ((add_len << 8) & 0xff);
4004         buf[1] = (add_len & 0xff);
4005         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4006         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4007         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4008         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4009         /*
4010          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4011          * set the TMV: Task Mask Valid bit.
4012          */
4013         buf[3] |= 0x80;
4014         /*
4015          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4016          */
4017         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4018         /*
4019          * PTPL_A: Persistence across Target Power Loss Active bit
4020          */
4021         if (pr_tmpl->pr_aptpl_active)
4022                 buf[3] |= 0x01;
4023         /*
4024          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4025          */
4026         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4027         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4028         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4029         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4030         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4031         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4032
4033         transport_kunmap_first_data_page(cmd);
4034
4035         return 0;
4036 }
4037
4038 /*
4039  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4040  *
4041  * See spc4r17 section 6.13.5 Table 168 and 169
4042  */
4043 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4044 {
4045         struct se_device *se_dev = cmd->se_dev;
4046         struct se_node_acl *se_nacl;
4047         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4048         struct se_portal_group *se_tpg;
4049         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4050         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4051         unsigned char *buf;
4052         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4053         u32 off = 8; /* off into first Full Status descriptor */
4054         int format_code = 0;
4055
4056         if (cmd->data_length < 8) {
4057                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4058                         " too small\n", cmd->data_length);
4059                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4060         }
4061
4062         buf = transport_kmap_first_data_page(cmd);
4063
4064         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4065         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4066         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4067         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4068
4069         spin_lock(&pr_tmpl->registration_lock);
4070         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4071                         &pr_tmpl->registration_list, pr_reg_list) {
4072
4073                 se_nacl = pr_reg->pr_reg_nacl;
4074                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4075                 add_desc_len = 0;
4076
4077                 atomic_inc(&pr_reg->pr_res_holders);
4078                 smp_mb__after_atomic_inc();
4079                 spin_unlock(&pr_tmpl->registration_lock);
4080                 /*
4081                  * Determine expected length of $FABRIC_MOD specific
4082                  * TransportID full status descriptor..
4083                  */
4084                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4085                                 se_tpg, se_nacl, pr_reg, &format_code);
4086
4087                 if ((exp_desc_len + add_len) > cmd->data_length) {
4088                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4089                                 " out of buffer: %d\n", cmd->data_length);
4090                         spin_lock(&pr_tmpl->registration_lock);
4091                         atomic_dec(&pr_reg->pr_res_holders);
4092                         smp_mb__after_atomic_dec();
4093                         break;
4094                 }
4095                 /*
4096                  * Set RESERVATION KEY
4097                  */
4098                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4099                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4100                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4101                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4102                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4103                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4104                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4105                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4106                 off += 4; /* Skip Over Reserved area */
4107
4108                 /*
4109                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4110                  */
4111                 if (pr_reg->pr_reg_all_tg_pt)
4112                         buf[off] = 0x02;
4113                 /*
4114                  * The struct se_lun pointer will be present for the
4115                  * reservation holder for PR_HOLDER bit.
4116                  *
4117                  * Also, if this registration is the reservation
4118                  * holder, fill in SCOPE and TYPE in the next byte.
4119                  */
4120                 if (pr_reg->pr_res_holder) {
4121                         buf[off++] |= 0x01;
4122                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4123                                      (pr_reg->pr_res_type & 0x0f);
4124                 } else
4125                         off += 2;
4126
4127                 off += 4; /* Skip over reserved area */
4128                 /*
4129                  * From spc4r17 6.3.15:
4130                  *
4131                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4132                  * IDENTIFIER field contains the relative port identifier (see
4133                  * 3.1.120) of the target port that is part of the I_T nexus
4134                  * described by this full status descriptor. If the ALL_TG_PT
4135                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4136                  * IDENTIFIER field are not defined by this standard.
4137                  */
4138                 if (!pr_reg->pr_reg_all_tg_pt) {
4139                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4140
4141                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4142                         buf[off++] = (port->sep_rtpi & 0xff);
4143                 } else
4144                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4145
4146                 /*
4147                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4148                  */
4149                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4150                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4151
4152                 spin_lock(&pr_tmpl->registration_lock);
4153                 atomic_dec(&pr_reg->pr_res_holders);
4154                 smp_mb__after_atomic_dec();
4155                 /*
4156                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4157                  */
4158                 buf[off++] = ((desc_len >> 24) & 0xff);
4159                 buf[off++] = ((desc_len >> 16) & 0xff);
4160                 buf[off++] = ((desc_len >> 8) & 0xff);
4161                 buf[off++] = (desc_len & 0xff);
4162                 /*
4163                  * Size of full desctipor header minus TransportID
4164                  * containing $FABRIC_MOD specific) initiator device/port
4165                  * WWN information.
4166                  *
4167                  *  See spc4r17 Section 6.13.5 Table 169
4168                  */
4169                 add_desc_len = (24 + desc_len);
4170
4171                 off += desc_len;
4172                 add_len += add_desc_len;
4173         }
4174         spin_unlock(&pr_tmpl->registration_lock);
4175         /*
4176          * Set ADDITIONAL_LENGTH
4177          */
4178         buf[4] = ((add_len >> 24) & 0xff);
4179         buf[5] = ((add_len >> 16) & 0xff);
4180         buf[6] = ((add_len >> 8) & 0xff);
4181         buf[7] = (add_len & 0xff);
4182
4183         transport_kunmap_first_data_page(cmd);
4184
4185         return 0;
4186 }
4187
4188 static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
4189 {
4190         switch (cdb[1] & 0x1f) {
4191         case PRI_READ_KEYS:
4192                 return core_scsi3_pri_read_keys(cmd);
4193         case PRI_READ_RESERVATION:
4194                 return core_scsi3_pri_read_reservation(cmd);
4195         case PRI_REPORT_CAPABILITIES:
4196                 return core_scsi3_pri_report_capabilities(cmd);
4197         case PRI_READ_FULL_STATUS:
4198                 return core_scsi3_pri_read_full_status(cmd);
4199         default:
4200                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4201                         " action: 0x%02x\n", cdb[1] & 0x1f);
4202                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4203         }
4204
4205 }
4206
4207 int core_scsi3_emulate_pr(struct se_cmd *cmd)
4208 {
4209         unsigned char *cdb = &cmd->t_task_cdb[0];
4210         struct se_device *dev = cmd->se_dev;
4211         /*
4212          * Following spc2r20 5.5.1 Reservations overview:
4213          *
4214          * If a logical unit has been reserved by any RESERVE command and is
4215          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4216          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4217          * initiator or service action and shall terminate with a RESERVATION
4218          * CONFLICT status.
4219          */
4220         if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
4221                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4222                         " SPC-2 reservation is held, returning"
4223                         " RESERVATION_CONFLICT\n");
4224                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4225         }
4226
4227         return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
4228                core_scsi3_emulate_pr_out(cmd, cdb) :
4229                core_scsi3_emulate_pr_in(cmd, cdb);
4230 }
4231
4232 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4233 {
4234         return 0;
4235 }
4236
4237 static int core_pt_seq_non_holder(
4238         struct se_cmd *cmd,
4239         unsigned char *cdb,
4240         u32 pr_reg_type)
4241 {
4242         return 0;
4243 }
4244
4245 int core_setup_reservations(struct se_device *dev, int force_pt)
4246 {
4247         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4248         struct t10_reservation *rest = &su_dev->t10_pr;
4249         /*
4250          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4251          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4252          * cause a problem because libata and some SATA RAID HBAs appear
4253          * under Linux/SCSI, but to emulate reservations themselves.
4254          */
4255         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4256             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4257                 rest->res_type = SPC_PASSTHROUGH;
4258                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4259                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4260                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4261                         " emulation\n", dev->transport->name);
4262                 return 0;
4263         }
4264         /*
4265          * If SPC-3 or above is reported by real or emulated struct se_device,
4266          * use emulated Persistent Reservations.
4267          */
4268         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4269                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4270                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4271                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4272                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4273                         " emulation\n", dev->transport->name);
4274         } else {
4275                 rest->res_type = SPC2_RESERVATIONS;
4276                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4277                 rest->pr_ops.t10_seq_non_holder =
4278                                 &core_scsi2_reservation_seq_non_holder;
4279                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4280                         dev->transport->name);
4281         }
4282
4283         return 0;
4284 }