Pileus Git - ~andy/linux/blob - drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * Copyright (c) 2009, 2010 Rising Tide Systems
   8  * Copyright (c) 2009, 2010 Linux-iSCSI.org
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  *
  26  ******************************************************************************/
  27
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/list.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_pr.h"
  42 #include "target_core_ua.h"
  43
  44 /*
  45  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  46  */
  47 struct pr_transport_id_holder {
  48         int dest_local_nexus;
  49         struct t10_pr_registration *dest_pr_reg;
  50         struct se_portal_group *dest_tpg;
  51         struct se_node_acl *dest_node_acl;
  52         struct se_dev_entry *dest_se_deve;
  53         struct list_head dest_list;
  54 };
  55
  56 int core_pr_dump_initiator_port(
  57         struct t10_pr_registration *pr_reg,
  58         char *buf,
  59         u32 size)
  60 {
  61         if (!pr_reg->isid_present_at_reg)
  62                 return 0;
  63
  64         snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
  65         return 1;
  66 }
  67
  68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  69                         struct t10_pr_registration *, int);
  70
  71 static int core_scsi2_reservation_seq_non_holder(
  72         struct se_cmd *cmd,
  73         unsigned char *cdb,
  74         u32 pr_reg_type)
  75 {
  76         switch (cdb[0]) {
  77         case INQUIRY:
  78         case RELEASE:
  79         case RELEASE_10:
  80                 return 0;
  81         default:
  82                 return 1;
  83         }
  84
  85         return 1;
  86 }
  87
  88 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
  89 {
  90         struct se_device *dev = cmd->se_dev;
  91         struct se_session *sess = cmd->se_sess;
  92         int ret;
  93
  94         if (!sess)
  95                 return 0;
  96
  97         spin_lock(&dev->dev_reservation_lock);
  98         if (!dev->dev_reserved_node_acl || !sess) {
  99                 spin_unlock(&dev->dev_reservation_lock);
 100                 return 0;
 101         }
 102         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 103                 spin_unlock(&dev->dev_reservation_lock);
 104                 return -EINVAL;
 105         }
 106         if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
 107                 spin_unlock(&dev->dev_reservation_lock);
 108                 return 0;
 109         }
 110         ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
 111         spin_unlock(&dev->dev_reservation_lock);
 112
 113         return ret;
 114 }
 115
 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 117                                         struct se_node_acl *, struct se_session *);
 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 119
 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
 121 {
 122         struct se_session *se_sess = cmd->se_sess;
 123         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 124         struct t10_pr_registration *pr_reg;
 125         struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
 126         int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
 127         int conflict = 0;
 128
 129         if (!crh)
 130                 return false;
 131
 132         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 133                         se_sess);
 134         if (pr_reg) {
 135                 /*
 136                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 137                  * behavior
 138                  *
 139                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 140                  * status, but no reservation shall be established and the
 141                  * persistent reservation shall not be changed, if the command
 142                  * is received from a) and b) below.
 143                  *
 144                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 145                  * status, but the persistent reservation shall not be released,
 146                  * if the command is received from a) and b)
 147                  *
 148                  * a) An I_T nexus that is a persistent reservation holder; or
 149                  * b) An I_T nexus that is registered if a registrants only or
 150                  *    all registrants type persistent reservation is present.
 151                  *
 152                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 153                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 154                  * as defined in SPC-2.
 155                  */
 156                 if (pr_reg->pr_res_holder) {
 157                         core_scsi3_put_pr_reg(pr_reg);
 158                         *ret = 0;
 159                         return false;
 160                 }
 161                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 162                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 163                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 164                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 165                         core_scsi3_put_pr_reg(pr_reg);
 166                         *ret = 0;
 167                         return true;
 168                 }
 169                 core_scsi3_put_pr_reg(pr_reg);
 170                 conflict = 1;
 171         } else {
 172                 /*
 173                  * Following spc2r20 5.5.1 Reservations overview:
 174                  *
 175                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 176                  * command with the REGISTER or the REGISTER AND IGNORE
 177                  * EXISTING KEY service action and is still registered by any
 178                  * initiator, all RESERVE commands and all RELEASE commands
 179                  * regardless of initiator shall conflict and shall terminate
 180                  * with a RESERVATION CONFLICT status.
 181                  */
 182                 spin_lock(&pr_tmpl->registration_lock);
 183                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 184                 spin_unlock(&pr_tmpl->registration_lock);
 185         }
 186
 187         if (conflict) {
 188                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 189                         " while active SPC-3 registrations exist,"
 190                         " returning RESERVATION_CONFLICT\n");
 191                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 192                 return true;
 193         }
 194
 195         return false;
 196 }
 197
 198 int target_scsi2_reservation_release(struct se_task *task)
 199 {
 200         struct se_cmd *cmd = task->task_se_cmd;
 201         struct se_device *dev = cmd->se_dev;
 202         struct se_session *sess = cmd->se_sess;
 203         struct se_portal_group *tpg = sess->se_tpg;
 204         int ret = 0;
 205
 206         if (!sess || !tpg)
 207                 goto out;
 208         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 209                 goto out;
 210
 211         ret = 0;
 212         spin_lock(&dev->dev_reservation_lock);
 213         if (!dev->dev_reserved_node_acl || !sess)
 214                 goto out_unlock;
 215
 216         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 217                 goto out_unlock;
 218
 219         dev->dev_reserved_node_acl = NULL;
 220         dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 221         if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
 222                 dev->dev_res_bin_isid = 0;
 223                 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
 224         }
 225         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 226                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 227                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 228                 sess->se_node_acl->initiatorname);
 229
 230 out_unlock:
 231         spin_unlock(&dev->dev_reservation_lock);
 232 out:
 233         if (!ret) {
 234                 task->task_scsi_status = GOOD;
 235                 transport_complete_task(task, 1);
 236         }
 237         return ret;
 238 }
 239
 240 int target_scsi2_reservation_reserve(struct se_task *task)
 241 {
 242         struct se_cmd *cmd = task->task_se_cmd;
 243         struct se_device *dev = cmd->se_dev;
 244         struct se_session *sess = cmd->se_sess;
 245         struct se_portal_group *tpg = sess->se_tpg;
 246         int ret = 0;
 247
 248         if ((cmd->t_task_cdb[1] & 0x01) &&
 249             (cmd->t_task_cdb[1] & 0x02)) {
 250                 pr_err("LongIO and Obselete Bits set, returning"
 251                                 " ILLEGAL_REQUEST\n");
 252                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
 253                 ret = -EINVAL;
 254                 goto out;
 255         }
 256         /*
 257          * This is currently the case for target_core_mod passthrough struct se_cmd
 258          * ops
 259          */
 260         if (!sess || !tpg)
 261                 goto out;
 262         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 263                 goto out;
 264
 265         ret = 0;
 266         spin_lock(&dev->dev_reservation_lock);
 267         if (dev->dev_reserved_node_acl &&
 268            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 269                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 270                         tpg->se_tpg_tfo->get_fabric_name());
 271                 pr_err("Original reserver LUN: %u %s\n",
 272                         cmd->se_lun->unpacked_lun,
 273                         dev->dev_reserved_node_acl->initiatorname);
 274                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 275                         " from %s \n", cmd->se_lun->unpacked_lun,
 276                         cmd->se_deve->mapped_lun,
 277                         sess->se_node_acl->initiatorname);
 278                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
 279                 ret = -EINVAL;
 280                 goto out_unlock;
 281         }
 282
 283         dev->dev_reserved_node_acl = sess->se_node_acl;
 284         dev->dev_flags |= DF_SPC2_RESERVATIONS;
 285         if (sess->sess_bin_isid != 0) {
 286                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 287                 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
 288         }
 289         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 290                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 291                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 292                 sess->se_node_acl->initiatorname);
 293
 294 out_unlock:
 295         spin_unlock(&dev->dev_reservation_lock);
 296 out:
 297         if (!ret) {
 298                 task->task_scsi_status = GOOD;
 299                 transport_complete_task(task, 1);
 300         }
 301         return ret;
 302 }
 303
 304
 305 /*
 306  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 307  *
 308  * This function is called by those initiator ports who are *NOT*
 309  * the active PR reservation holder when a reservation is present.
 310  */
 311 static int core_scsi3_pr_seq_non_holder(
 312         struct se_cmd *cmd,
 313         unsigned char *cdb,
 314         u32 pr_reg_type)
 315 {
 316         struct se_dev_entry *se_deve;
 317         struct se_session *se_sess = cmd->se_sess;
 318         int other_cdb = 0, ignore_reg;
 319         int registered_nexus = 0, ret = 1; /* Conflict by default */
 320         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 321         int we = 0; /* Write Exclusive */
 322         int legacy = 0; /* Act like a legacy device and return
 323                          * RESERVATION CONFLICT on some CDBs */
 324         /*
 325          * A legacy SPC-2 reservation is being held.
 326          */
 327         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
 328                 return core_scsi2_reservation_seq_non_holder(cmd,
 329                                         cdb, pr_reg_type);
 330
 331         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 332         /*
 333          * Determine if the registration should be ignored due to
 334          * non-matching ISIDs in core_scsi3_pr_reservation_check().
 335          */
 336         ignore_reg = (pr_reg_type & 0x80000000);
 337         if (ignore_reg)
 338                 pr_reg_type &= ~0x80000000;
 339
 340         switch (pr_reg_type) {
 341         case PR_TYPE_WRITE_EXCLUSIVE:
 342                 we = 1;
 343         case PR_TYPE_EXCLUSIVE_ACCESS:
 344                 /*
 345                  * Some commands are only allowed for the persistent reservation
 346                  * holder.
 347                  */
 348                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 349                         registered_nexus = 1;
 350                 break;
 351         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 352                 we = 1;
 353         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 354                 /*
 355                  * Some commands are only allowed for registered I_T Nexuses.
 356                  */
 357                 reg_only = 1;
 358                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 359                         registered_nexus = 1;
 360                 break;
 361         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 362                 we = 1;
 363         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 364                 /*
 365                  * Each registered I_T Nexus is a reservation holder.
 366                  */
 367                 all_reg = 1;
 368                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 369                         registered_nexus = 1;
 370                 break;
 371         default:
 372                 return -EINVAL;
 373         }
 374         /*
 375          * Referenced from spc4r17 table 45 for *NON* PR holder access
 376          */
 377         switch (cdb[0]) {
 378         case SECURITY_PROTOCOL_IN:
 379                 if (registered_nexus)
 380                         return 0;
 381                 ret = (we) ? 0 : 1;
 382                 break;
 383         case MODE_SENSE:
 384         case MODE_SENSE_10:
 385         case READ_ATTRIBUTE:
 386         case READ_BUFFER:
 387         case RECEIVE_DIAGNOSTIC:
 388                 if (legacy) {
 389                         ret = 1;
 390                         break;
 391                 }
 392                 if (registered_nexus) {
 393                         ret = 0;
 394                         break;
 395                 }
 396                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 397                 break;
 398         case PERSISTENT_RESERVE_OUT:
 399                 /*
 400                  * This follows PERSISTENT_RESERVE_OUT service actions that
 401                  * are allowed in the presence of various reservations.
 402                  * See spc4r17, table 46
 403                  */
 404                 switch (cdb[1] & 0x1f) {
 405                 case PRO_CLEAR:
 406                 case PRO_PREEMPT:
 407                 case PRO_PREEMPT_AND_ABORT:
 408                         ret = (registered_nexus) ? 0 : 1;
 409                         break;
 410                 case PRO_REGISTER:
 411                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 412                         ret = 0;
 413                         break;
 414                 case PRO_REGISTER_AND_MOVE:
 415                 case PRO_RESERVE:
 416                         ret = 1;
 417                         break;
 418                 case PRO_RELEASE:
 419                         ret = (registered_nexus) ? 0 : 1;
 420                         break;
 421                 default:
 422                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 423                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 424                         return -EINVAL;
 425                 }
 426                 break;
 427         case RELEASE:
 428         case RELEASE_10:
 429                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 430                 ret = 0;
 431                 break;
 432         case RESERVE:
 433         case RESERVE_10:
 434                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 435                 ret = 0;
 436                 break;
 437         case TEST_UNIT_READY:
 438                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 439                 break;
 440         case MAINTENANCE_IN:
 441                 switch (cdb[1] & 0x1f) {
 442                 case MI_MANAGEMENT_PROTOCOL_IN:
 443                         if (registered_nexus) {
 444                                 ret = 0;
 445                                 break;
 446                         }
 447                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 448                         break;
 449                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 450                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 451                         if (legacy) {
 452                                 ret = 1;
 453                                 break;
 454                         }
 455                         if (registered_nexus) {
 456                                 ret = 0;
 457                                 break;
 458                         }
 459                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 460                         break;
 461                 case MI_REPORT_ALIASES:
 462                 case MI_REPORT_IDENTIFYING_INFORMATION:
 463                 case MI_REPORT_PRIORITY:
 464                 case MI_REPORT_TARGET_PGS:
 465                 case MI_REPORT_TIMESTAMP:
 466                         ret = 0; /* Allowed */
 467                         break;
 468                 default:
 469                         pr_err("Unknown MI Service Action: 0x%02x\n",
 470                                 (cdb[1] & 0x1f));
 471                         return -EINVAL;
 472                 }
 473                 break;
 474         case ACCESS_CONTROL_IN:
 475         case ACCESS_CONTROL_OUT:
 476         case INQUIRY:
 477         case LOG_SENSE:
 478         case READ_MEDIA_SERIAL_NUMBER:
 479         case REPORT_LUNS:
 480         case REQUEST_SENSE:
 481                 ret = 0; /*/ Allowed CDBs */
 482                 break;
 483         default:
 484                 other_cdb = 1;
 485                 break;
 486         }
 487         /*
 488          * Case where the CDB is explicitly allowed in the above switch
 489          * statement.
 490          */
 491         if (!ret && !other_cdb) {
 492 #if 0
 493                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 494                         " reservation holder\n", cdb[0],
 495                         core_scsi3_pr_dump_type(pr_reg_type));
 496 #endif
 497                 return ret;
 498         }
 499         /*
 500          * Check if write exclusive initiator ports *NOT* holding the
 501          * WRITE_EXCLUSIVE_* reservation.
 502          */
 503         if ((we) && !(registered_nexus)) {
 504                 if (cmd->data_direction == DMA_TO_DEVICE) {
 505                         /*
 506                          * Conflict for write exclusive
 507                          */
 508                         pr_debug("%s Conflict for unregistered nexus"
 509                                 " %s CDB: 0x%02x to %s reservation\n",
 510                                 transport_dump_cmd_direction(cmd),
 511                                 se_sess->se_node_acl->initiatorname, cdb[0],
 512                                 core_scsi3_pr_dump_type(pr_reg_type));
 513                         return 1;
 514                 } else {
 515                         /*
 516                          * Allow non WRITE CDBs for all Write Exclusive
 517                          * PR TYPEs to pass for registered and
 518                          * non-registered_nexuxes NOT holding the reservation.
 519                          *
 520                          * We only make noise for the unregisterd nexuses,
 521                          * as we expect registered non-reservation holding
 522                          * nexuses to issue CDBs.
 523                          */
 524 #if 0
 525                         if (!registered_nexus) {
 526                                 pr_debug("Allowing implict CDB: 0x%02x"
 527                                         " for %s reservation on unregistered"
 528                                         " nexus\n", cdb[0],
 529                                         core_scsi3_pr_dump_type(pr_reg_type));
 530                         }
 531 #endif
 532                         return 0;
 533                 }
 534         } else if ((reg_only) || (all_reg)) {
 535                 if (registered_nexus) {
 536                         /*
 537                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 538                          * allow commands from registered nexuses.
 539                          */
 540 #if 0
 541                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 542                                 " reservation\n", cdb[0],
 543                                 core_scsi3_pr_dump_type(pr_reg_type));
 544 #endif
 545                         return 0;
 546                 }
 547         }
 548         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 549                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 550                 (registered_nexus) ? "" : "un",
 551                 se_sess->se_node_acl->initiatorname, cdb[0],
 552                 core_scsi3_pr_dump_type(pr_reg_type));
 553
 554         return 1; /* Conflict by default */
 555 }
 556
 557 static u32 core_scsi3_pr_generation(struct se_device *dev)
 558 {
 559         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 560         u32 prg;
 561         /*
 562          * PRGeneration field shall contain the value of a 32-bit wrapping
 563          * counter mainted by the device server.
 564          *
 565          * Note that this is done regardless of Active Persist across
 566          * Target PowerLoss (APTPL)
 567          *
 568          * See spc4r17 section 6.3.12 READ_KEYS service action
 569          */
 570         spin_lock(&dev->dev_reservation_lock);
 571         prg = su_dev->t10_pr.pr_generation++;
 572         spin_unlock(&dev->dev_reservation_lock);
 573
 574         return prg;
 575 }
 576
 577 static int core_scsi3_pr_reservation_check(
 578         struct se_cmd *cmd,
 579         u32 *pr_reg_type)
 580 {
 581         struct se_device *dev = cmd->se_dev;
 582         struct se_session *sess = cmd->se_sess;
 583         int ret;
 584
 585         if (!sess)
 586                 return 0;
 587         /*
 588          * A legacy SPC-2 reservation is being held.
 589          */
 590         if (dev->dev_flags & DF_SPC2_RESERVATIONS)
 591                 return core_scsi2_reservation_check(cmd, pr_reg_type);
 592
 593         spin_lock(&dev->dev_reservation_lock);
 594         if (!dev->dev_pr_res_holder) {
 595                 spin_unlock(&dev->dev_reservation_lock);
 596                 return 0;
 597         }
 598         *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 599         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 600         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
 601                 spin_unlock(&dev->dev_reservation_lock);
 602                 return -EINVAL;
 603         }
 604         if (!dev->dev_pr_res_holder->isid_present_at_reg) {
 605                 spin_unlock(&dev->dev_reservation_lock);
 606                 return 0;
 607         }
 608         ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
 609                sess->sess_bin_isid) ? 0 : -EINVAL;
 610         /*
 611          * Use bit in *pr_reg_type to notify ISID mismatch in
 612          * core_scsi3_pr_seq_non_holder().
 613          */
 614         if (ret != 0)
 615                 *pr_reg_type |= 0x80000000;
 616         spin_unlock(&dev->dev_reservation_lock);
 617
 618         return ret;
 619 }
 620
 621 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 622         struct se_device *dev,
 623         struct se_node_acl *nacl,
 624         struct se_dev_entry *deve,
 625         unsigned char *isid,
 626         u64 sa_res_key,
 627         int all_tg_pt,
 628         int aptpl)
 629 {
 630         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 631         struct t10_pr_registration *pr_reg;
 632
 633         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 634         if (!pr_reg) {
 635                 pr_err("Unable to allocate struct t10_pr_registration\n");
 636                 return NULL;
 637         }
 638
 639         pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
 640                                         GFP_ATOMIC);
 641         if (!pr_reg->pr_aptpl_buf) {
 642                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 643                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 644                 return NULL;
 645         }
 646
 647         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 648         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 649         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 650         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 651         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 652         atomic_set(&pr_reg->pr_res_holders, 0);
 653         pr_reg->pr_reg_nacl = nacl;
 654         pr_reg->pr_reg_deve = deve;
 655         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 656         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 657         pr_reg->pr_res_key = sa_res_key;
 658         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 659         pr_reg->pr_reg_aptpl = aptpl;
 660         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 661         /*
 662          * If an ISID value for this SCSI Initiator Port exists,
 663          * save it to the registration now.
 664          */
 665         if (isid != NULL) {
 666                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 667                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 668                 pr_reg->isid_present_at_reg = 1;
 669         }
 670
 671         return pr_reg;
 672 }
 673
 674 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 675 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 676
 677 /*
 678  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 679  * modes.
 680  */
 681 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 682         struct se_device *dev,
 683         struct se_node_acl *nacl,
 684         struct se_dev_entry *deve,
 685         unsigned char *isid,
 686         u64 sa_res_key,
 687         int all_tg_pt,
 688         int aptpl)
 689 {
 690         struct se_dev_entry *deve_tmp;
 691         struct se_node_acl *nacl_tmp;
 692         struct se_port *port, *port_tmp;
 693         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 694         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 695         int ret;
 696         /*
 697          * Create a registration for the I_T Nexus upon which the
 698          * PROUT REGISTER was received.
 699          */
 700         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 701                         sa_res_key, all_tg_pt, aptpl);
 702         if (!pr_reg)
 703                 return NULL;
 704         /*
 705          * Return pointer to pr_reg for ALL_TG_PT=0
 706          */
 707         if (!all_tg_pt)
 708                 return pr_reg;
 709         /*
 710          * Create list of matching SCSI Initiator Port registrations
 711          * for ALL_TG_PT=1
 712          */
 713         spin_lock(&dev->se_port_lock);
 714         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 715                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 716                 smp_mb__after_atomic_inc();
 717                 spin_unlock(&dev->se_port_lock);
 718
 719                 spin_lock_bh(&port->sep_alua_lock);
 720                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 721                                         alua_port_list) {
 722                         /*
 723                          * This pointer will be NULL for demo mode MappedLUNs
 724                          * that have not been make explict via a ConfigFS
 725                          * MappedLUN group for the SCSI Initiator Node ACL.
 726                          */
 727                         if (!deve_tmp->se_lun_acl)
 728                                 continue;
 729
 730                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 731                         /*
 732                          * Skip the matching struct se_node_acl that is allocated
 733                          * above..
 734                          */
 735                         if (nacl == nacl_tmp)
 736                                 continue;
 737                         /*
 738                          * Only perform PR registrations for target ports on
 739                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 740                          * arrived.
 741                          */
 742                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 743                                 continue;
 744                         /*
 745                          * Look for a matching Initiator Node ACL in ASCII format
 746                          */
 747                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 748                                 continue;
 749
 750                         atomic_inc(&deve_tmp->pr_ref_count);
 751                         smp_mb__after_atomic_inc();
 752                         spin_unlock_bh(&port->sep_alua_lock);
 753                         /*
 754                          * Grab a configfs group dependency that is released
 755                          * for the exception path at label out: below, or upon
 756                          * completion of adding ALL_TG_PT=1 registrations in
 757                          * __core_scsi3_add_registration()
 758                          */
 759                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 760                         if (ret < 0) {
 761                                 pr_err("core_scsi3_lunacl_depend"
 762                                                 "_item() failed\n");
 763                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 764                                 smp_mb__after_atomic_dec();
 765                                 atomic_dec(&deve_tmp->pr_ref_count);
 766                                 smp_mb__after_atomic_dec();
 767                                 goto out;
 768                         }
 769                         /*
 770                          * Located a matching SCSI Initiator Port on a different
 771                          * port, allocate the pr_reg_atp and attach it to the
 772                          * pr_reg->pr_reg_atp_list that will be processed once
 773                          * the original *pr_reg is processed in
 774                          * __core_scsi3_add_registration()
 775                          */
 776                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 777                                                 nacl_tmp, deve_tmp, NULL,
 778                                                 sa_res_key, all_tg_pt, aptpl);
 779                         if (!pr_reg_atp) {
 780                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 781                                 smp_mb__after_atomic_dec();
 782                                 atomic_dec(&deve_tmp->pr_ref_count);
 783                                 smp_mb__after_atomic_dec();
 784                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 785                                 goto out;
 786                         }
 787
 788                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 789                                       &pr_reg->pr_reg_atp_list);
 790                         spin_lock_bh(&port->sep_alua_lock);
 791                 }
 792                 spin_unlock_bh(&port->sep_alua_lock);
 793
 794                 spin_lock(&dev->se_port_lock);
 795                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 796                 smp_mb__after_atomic_dec();
 797         }
 798         spin_unlock(&dev->se_port_lock);
 799
 800         return pr_reg;
 801 out:
 802         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 803                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 804                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 805                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 806                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 807         }
 808         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 809         return NULL;
 810 }
 811
 812 int core_scsi3_alloc_aptpl_registration(
 813         struct t10_reservation *pr_tmpl,
 814         u64 sa_res_key,
 815         unsigned char *i_port,
 816         unsigned char *isid,
 817         u32 mapped_lun,
 818         unsigned char *t_port,
 819         u16 tpgt,
 820         u32 target_lun,
 821         int res_holder,
 822         int all_tg_pt,
 823         u8 type)
 824 {
 825         struct t10_pr_registration *pr_reg;
 826
 827         if (!i_port || !t_port || !sa_res_key) {
 828                 pr_err("Illegal parameters for APTPL registration\n");
 829                 return -EINVAL;
 830         }
 831
 832         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 833         if (!pr_reg) {
 834                 pr_err("Unable to allocate struct t10_pr_registration\n");
 835                 return -ENOMEM;
 836         }
 837         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 838
 839         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 840         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 841         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 842         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 843         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 844         atomic_set(&pr_reg->pr_res_holders, 0);
 845         pr_reg->pr_reg_nacl = NULL;
 846         pr_reg->pr_reg_deve = NULL;
 847         pr_reg->pr_res_mapped_lun = mapped_lun;
 848         pr_reg->pr_aptpl_target_lun = target_lun;
 849         pr_reg->pr_res_key = sa_res_key;
 850         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 851         pr_reg->pr_reg_aptpl = 1;
 852         pr_reg->pr_reg_tg_pt_lun = NULL;
 853         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 854         pr_reg->pr_res_type = type;
 855         /*
 856          * If an ISID value had been saved in APTPL metadata for this
 857          * SCSI Initiator Port, restore it now.
 858          */
 859         if (isid != NULL) {
 860                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 861                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 862                 pr_reg->isid_present_at_reg = 1;
 863         }
 864         /*
 865          * Copy the i_port and t_port information from caller.
 866          */
 867         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 868         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 869         pr_reg->pr_reg_tpgt = tpgt;
 870         /*
 871          * Set pr_res_holder from caller, the pr_reg who is the reservation
 872          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 873          * the Initiator Node LUN ACL from the fabric module is created for
 874          * this registration.
 875          */
 876         pr_reg->pr_res_holder = res_holder;
 877
 878         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 879         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 880                         " metadata\n", (res_holder) ? "+reservation" : "");
 881         return 0;
 882 }
 883
 884 static void core_scsi3_aptpl_reserve(
 885         struct se_device *dev,
 886         struct se_portal_group *tpg,
 887         struct se_node_acl *node_acl,
 888         struct t10_pr_registration *pr_reg)
 889 {
 890         char i_buf[PR_REG_ISID_ID_LEN];
 891         int prf_isid;
 892
 893         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 894         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 895                                 PR_REG_ISID_ID_LEN);
 896
 897         spin_lock(&dev->dev_reservation_lock);
 898         dev->dev_pr_res_holder = pr_reg;
 899         spin_unlock(&dev->dev_reservation_lock);
 900
 901         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 902                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 903                 tpg->se_tpg_tfo->get_fabric_name(),
 904                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 905                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 906         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 907                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 908                 (prf_isid) ? &i_buf[0] : "");
 909 }
 910
 911 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 912                                 struct t10_pr_registration *, int, int);
 913
 914 static int __core_scsi3_check_aptpl_registration(
 915         struct se_device *dev,
 916         struct se_portal_group *tpg,
 917         struct se_lun *lun,
 918         u32 target_lun,
 919         struct se_node_acl *nacl,
 920         struct se_dev_entry *deve)
 921 {
 922         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 923         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
 924         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 925         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 926         u16 tpgt;
 927
 928         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 929         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 930         /*
 931          * Copy Initiator Port information from struct se_node_acl
 932          */
 933         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 934         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 935                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 936         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 937         /*
 938          * Look for the matching registrations+reservation from those
 939          * created from APTPL metadata.  Note that multiple registrations
 940          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 941          * TransportIDs.
 942          */
 943         spin_lock(&pr_tmpl->aptpl_reg_lock);
 944         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 945                                 pr_reg_aptpl_list) {
 946                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 947                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 948                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 949                      (pr_reg->pr_reg_tpgt == tpgt) &&
 950                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 951
 952                         pr_reg->pr_reg_nacl = nacl;
 953                         pr_reg->pr_reg_deve = deve;
 954                         pr_reg->pr_reg_tg_pt_lun = lun;
 955
 956                         list_del(&pr_reg->pr_reg_aptpl_list);
 957                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 958                         /*
 959                          * At this point all of the pointers in *pr_reg will
 960                          * be setup, so go ahead and add the registration.
 961                          */
 962
 963                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 964                         /*
 965                          * If this registration is the reservation holder,
 966                          * make that happen now..
 967                          */
 968                         if (pr_reg->pr_res_holder)
 969                                 core_scsi3_aptpl_reserve(dev, tpg,
 970                                                 nacl, pr_reg);
 971                         /*
 972                          * Reenable pr_aptpl_active to accept new metadata
 973                          * updates once the SCSI device is active again..
 974                          */
 975                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 976                         pr_tmpl->pr_aptpl_active = 1;
 977                 }
 978         }
 979         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 980
 981         return 0;
 982 }
 983
 984 int core_scsi3_check_aptpl_registration(
 985         struct se_device *dev,
 986         struct se_portal_group *tpg,
 987         struct se_lun *lun,
 988         struct se_lun_acl *lun_acl)
 989 {
 990         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 991         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 992         struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
 993
 994         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
 995                 return 0;
 996
 997         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 998                                 lun->unpacked_lun, nacl, deve);
 999 }
1000
1001 static void __core_scsi3_dump_registration(
1002         struct target_core_fabric_ops *tfo,
1003         struct se_device *dev,
1004         struct se_node_acl *nacl,
1005         struct t10_pr_registration *pr_reg,
1006         int register_type)
1007 {
1008         struct se_portal_group *se_tpg = nacl->se_tpg;
1009         char i_buf[PR_REG_ISID_ID_LEN];
1010         int prf_isid;
1011
1012         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1013         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1014                                 PR_REG_ISID_ID_LEN);
1015
1016         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1017                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1018                 "_AND_MOVE" : (register_type == 1) ?
1019                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1020                 (prf_isid) ? i_buf : "");
1021         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1022                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1023                 tfo->tpg_get_tag(se_tpg));
1024         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1025                 " Port(s)\n",  tfo->get_fabric_name(),
1026                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1027                 dev->transport->name);
1028         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1029                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1030                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1031                 pr_reg->pr_reg_aptpl);
1032 }
1033
1034 /*
1035  * this function can be called with struct se_device->dev_reservation_lock
1036  * when register_move = 1
1037  */
1038 static void __core_scsi3_add_registration(
1039         struct se_device *dev,
1040         struct se_node_acl *nacl,
1041         struct t10_pr_registration *pr_reg,
1042         int register_type,
1043         int register_move)
1044 {
1045         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1046         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1047         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1048         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1049
1050         /*
1051          * Increment PRgeneration counter for struct se_device upon a successful
1052          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1053          *
1054          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1055          * action, the struct se_device->dev_reservation_lock will already be held,
1056          * so we do not call core_scsi3_pr_generation() which grabs the lock
1057          * for the REGISTER.
1058          */
1059         pr_reg->pr_res_generation = (register_move) ?
1060                         su_dev->t10_pr.pr_generation++ :
1061                         core_scsi3_pr_generation(dev);
1062
1063         spin_lock(&pr_tmpl->registration_lock);
1064         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1065         pr_reg->pr_reg_deve->def_pr_registered = 1;
1066
1067         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1068         spin_unlock(&pr_tmpl->registration_lock);
1069         /*
1070          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1071          */
1072         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1073                 return;
1074         /*
1075          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1076          * allocated in __core_scsi3_alloc_registration()
1077          */
1078         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1079                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1080                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1081
1082                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1083
1084                 spin_lock(&pr_tmpl->registration_lock);
1085                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1086                               &pr_tmpl->registration_list);
1087                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1088
1089                 __core_scsi3_dump_registration(tfo, dev,
1090                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1091                                 register_type);
1092                 spin_unlock(&pr_tmpl->registration_lock);
1093                 /*
1094                  * Drop configfs group dependency reference from
1095                  * __core_scsi3_alloc_registration()
1096                  */
1097                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1098         }
1099 }
1100
1101 static int core_scsi3_alloc_registration(
1102         struct se_device *dev,
1103         struct se_node_acl *nacl,
1104         struct se_dev_entry *deve,
1105         unsigned char *isid,
1106         u64 sa_res_key,
1107         int all_tg_pt,
1108         int aptpl,
1109         int register_type,
1110         int register_move)
1111 {
1112         struct t10_pr_registration *pr_reg;
1113
1114         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1115                         sa_res_key, all_tg_pt, aptpl);
1116         if (!pr_reg)
1117                 return -EPERM;
1118
1119         __core_scsi3_add_registration(dev, nacl, pr_reg,
1120                         register_type, register_move);
1121         return 0;
1122 }
1123
1124 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1125         struct se_device *dev,
1126         struct se_node_acl *nacl,
1127         unsigned char *isid)
1128 {
1129         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1130         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1131         struct se_portal_group *tpg;
1132
1133         spin_lock(&pr_tmpl->registration_lock);
1134         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1135                         &pr_tmpl->registration_list, pr_reg_list) {
1136                 /*
1137                  * First look for a matching struct se_node_acl
1138                  */
1139                 if (pr_reg->pr_reg_nacl != nacl)
1140                         continue;
1141
1142                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1143                 /*
1144                  * If this registration does NOT contain a fabric provided
1145                  * ISID, then we have found a match.
1146                  */
1147                 if (!pr_reg->isid_present_at_reg) {
1148                         /*
1149                          * Determine if this SCSI device server requires that
1150                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1151                          * for fabric modules (iSCSI) requiring them.
1152                          */
1153                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1154                                 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1155                                         continue;
1156                         }
1157                         atomic_inc(&pr_reg->pr_res_holders);
1158                         smp_mb__after_atomic_inc();
1159                         spin_unlock(&pr_tmpl->registration_lock);
1160                         return pr_reg;
1161                 }
1162                 /*
1163                  * If the *pr_reg contains a fabric defined ISID for multi-value
1164                  * SCSI Initiator Port TransportIDs, then we expect a valid
1165                  * matching ISID to be provided by the local SCSI Initiator Port.
1166                  */
1167                 if (!isid)
1168                         continue;
1169                 if (strcmp(isid, pr_reg->pr_reg_isid))
1170                         continue;
1171
1172                 atomic_inc(&pr_reg->pr_res_holders);
1173                 smp_mb__after_atomic_inc();
1174                 spin_unlock(&pr_tmpl->registration_lock);
1175                 return pr_reg;
1176         }
1177         spin_unlock(&pr_tmpl->registration_lock);
1178
1179         return NULL;
1180 }
1181
1182 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1183         struct se_device *dev,
1184         struct se_node_acl *nacl,
1185         struct se_session *sess)
1186 {
1187         struct se_portal_group *tpg = nacl->se_tpg;
1188         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1189
1190         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1191                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1192                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1193                                         PR_REG_ISID_LEN);
1194                 isid_ptr = &buf[0];
1195         }
1196
1197         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1198 }
1199
1200 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1201 {
1202         atomic_dec(&pr_reg->pr_res_holders);
1203         smp_mb__after_atomic_dec();
1204 }
1205
1206 static int core_scsi3_check_implict_release(
1207         struct se_device *dev,
1208         struct t10_pr_registration *pr_reg)
1209 {
1210         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1211         struct t10_pr_registration *pr_res_holder;
1212         int ret = 0;
1213
1214         spin_lock(&dev->dev_reservation_lock);
1215         pr_res_holder = dev->dev_pr_res_holder;
1216         if (!pr_res_holder) {
1217                 spin_unlock(&dev->dev_reservation_lock);
1218                 return ret;
1219         }
1220         if (pr_res_holder == pr_reg) {
1221                 /*
1222                  * Perform an implict RELEASE if the registration that
1223                  * is being released is holding the reservation.
1224                  *
1225                  * From spc4r17, section 5.7.11.1:
1226                  *
1227                  * e) If the I_T nexus is the persistent reservation holder
1228                  *    and the persistent reservation is not an all registrants
1229                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1230                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1231                  *    service action with the SERVICE ACTION RESERVATION KEY
1232                  *    field set to zero (see 5.7.11.3).
1233                  */
1234                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1235                 ret = 1;
1236                 /*
1237                  * For 'All Registrants' reservation types, all existing
1238                  * registrations are still processed as reservation holders
1239                  * in core_scsi3_pr_seq_non_holder() after the initial
1240                  * reservation holder is implictly released here.
1241                  */
1242         } else if (pr_reg->pr_reg_all_tg_pt &&
1243                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1244                           pr_reg->pr_reg_nacl->initiatorname)) &&
1245                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1246                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1247                         " UNREGISTER while existing reservation with matching"
1248                         " key 0x%016Lx is present from another SCSI Initiator"
1249                         " Port\n", pr_reg->pr_res_key);
1250                 ret = -EPERM;
1251         }
1252         spin_unlock(&dev->dev_reservation_lock);
1253
1254         return ret;
1255 }
1256
1257 /*
1258  * Called with struct t10_reservation->registration_lock held.
1259  */
1260 static void __core_scsi3_free_registration(
1261         struct se_device *dev,
1262         struct t10_pr_registration *pr_reg,
1263         struct list_head *preempt_and_abort_list,
1264         int dec_holders)
1265 {
1266         struct target_core_fabric_ops *tfo =
1267                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1268         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1269         char i_buf[PR_REG_ISID_ID_LEN];
1270         int prf_isid;
1271
1272         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1273         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1274                                 PR_REG_ISID_ID_LEN);
1275
1276         pr_reg->pr_reg_deve->def_pr_registered = 0;
1277         pr_reg->pr_reg_deve->pr_res_key = 0;
1278         list_del(&pr_reg->pr_reg_list);
1279         /*
1280          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1281          * so call core_scsi3_put_pr_reg() to decrement our reference.
1282          */
1283         if (dec_holders)
1284                 core_scsi3_put_pr_reg(pr_reg);
1285         /*
1286          * Wait until all reference from any other I_T nexuses for this
1287          * *pr_reg have been released.  Because list_del() is called above,
1288          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1289          * count back to zero, and we release *pr_reg.
1290          */
1291         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1292                 spin_unlock(&pr_tmpl->registration_lock);
1293                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1294                                 tfo->get_fabric_name());
1295                 cpu_relax();
1296                 spin_lock(&pr_tmpl->registration_lock);
1297         }
1298
1299         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1300                 " Node: %s%s\n", tfo->get_fabric_name(),
1301                 pr_reg->pr_reg_nacl->initiatorname,
1302                 (prf_isid) ? &i_buf[0] : "");
1303         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1304                 " Port(s)\n", tfo->get_fabric_name(),
1305                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1306                 dev->transport->name);
1307         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1308                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1309                 pr_reg->pr_res_generation);
1310
1311         if (!preempt_and_abort_list) {
1312                 pr_reg->pr_reg_deve = NULL;
1313                 pr_reg->pr_reg_nacl = NULL;
1314                 kfree(pr_reg->pr_aptpl_buf);
1315                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1316                 return;
1317         }
1318         /*
1319          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1320          * are released once the ABORT_TASK_SET has completed..
1321          */
1322         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1323 }
1324
1325 void core_scsi3_free_pr_reg_from_nacl(
1326         struct se_device *dev,
1327         struct se_node_acl *nacl)
1328 {
1329         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1330         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1331         /*
1332          * If the passed se_node_acl matches the reservation holder,
1333          * release the reservation.
1334          */
1335         spin_lock(&dev->dev_reservation_lock);
1336         pr_res_holder = dev->dev_pr_res_holder;
1337         if ((pr_res_holder != NULL) &&
1338             (pr_res_holder->pr_reg_nacl == nacl))
1339                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1340         spin_unlock(&dev->dev_reservation_lock);
1341         /*
1342          * Release any registration associated with the struct se_node_acl.
1343          */
1344         spin_lock(&pr_tmpl->registration_lock);
1345         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1346                         &pr_tmpl->registration_list, pr_reg_list) {
1347
1348                 if (pr_reg->pr_reg_nacl != nacl)
1349                         continue;
1350
1351                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1352         }
1353         spin_unlock(&pr_tmpl->registration_lock);
1354 }
1355
1356 void core_scsi3_free_all_registrations(
1357         struct se_device *dev)
1358 {
1359         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1360         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1361
1362         spin_lock(&dev->dev_reservation_lock);
1363         pr_res_holder = dev->dev_pr_res_holder;
1364         if (pr_res_holder != NULL) {
1365                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1366                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1367                                 pr_res_holder, 0);
1368         }
1369         spin_unlock(&dev->dev_reservation_lock);
1370
1371         spin_lock(&pr_tmpl->registration_lock);
1372         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1373                         &pr_tmpl->registration_list, pr_reg_list) {
1374
1375                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1376         }
1377         spin_unlock(&pr_tmpl->registration_lock);
1378
1379         spin_lock(&pr_tmpl->aptpl_reg_lock);
1380         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1381                                 pr_reg_aptpl_list) {
1382                 list_del(&pr_reg->pr_reg_aptpl_list);
1383                 kfree(pr_reg->pr_aptpl_buf);
1384                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1385         }
1386         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1387 }
1388
1389 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1390 {
1391         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1392                         &tpg->tpg_group.cg_item);
1393 }
1394
1395 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1396 {
1397         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1398                         &tpg->tpg_group.cg_item);
1399
1400         atomic_dec(&tpg->tpg_pr_ref_count);
1401         smp_mb__after_atomic_dec();
1402 }
1403
1404 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1405 {
1406         struct se_portal_group *tpg = nacl->se_tpg;
1407
1408         if (nacl->dynamic_node_acl)
1409                 return 0;
1410
1411         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1412                         &nacl->acl_group.cg_item);
1413 }
1414
1415 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1416 {
1417         struct se_portal_group *tpg = nacl->se_tpg;
1418
1419         if (nacl->dynamic_node_acl) {
1420                 atomic_dec(&nacl->acl_pr_ref_count);
1421                 smp_mb__after_atomic_dec();
1422                 return;
1423         }
1424
1425         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1426                         &nacl->acl_group.cg_item);
1427
1428         atomic_dec(&nacl->acl_pr_ref_count);
1429         smp_mb__after_atomic_dec();
1430 }
1431
1432 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1433 {
1434         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1435         struct se_node_acl *nacl;
1436         struct se_portal_group *tpg;
1437         /*
1438          * For nacl->dynamic_node_acl=1
1439          */
1440         if (!lun_acl)
1441                 return 0;
1442
1443         nacl = lun_acl->se_lun_nacl;
1444         tpg = nacl->se_tpg;
1445
1446         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1447                         &lun_acl->se_lun_group.cg_item);
1448 }
1449
1450 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1451 {
1452         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1453         struct se_node_acl *nacl;
1454         struct se_portal_group *tpg;
1455         /*
1456          * For nacl->dynamic_node_acl=1
1457          */
1458         if (!lun_acl) {
1459                 atomic_dec(&se_deve->pr_ref_count);
1460                 smp_mb__after_atomic_dec();
1461                 return;
1462         }
1463         nacl = lun_acl->se_lun_nacl;
1464         tpg = nacl->se_tpg;
1465
1466         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1467                         &lun_acl->se_lun_group.cg_item);
1468
1469         atomic_dec(&se_deve->pr_ref_count);
1470         smp_mb__after_atomic_dec();
1471 }
1472
1473 static int core_scsi3_decode_spec_i_port(
1474         struct se_cmd *cmd,
1475         struct se_portal_group *tpg,
1476         unsigned char *l_isid,
1477         u64 sa_res_key,
1478         int all_tg_pt,
1479         int aptpl)
1480 {
1481         struct se_device *dev = cmd->se_dev;
1482         struct se_port *tmp_port;
1483         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1484         struct se_session *se_sess = cmd->se_sess;
1485         struct se_node_acl *dest_node_acl = NULL;
1486         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1487         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1488         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1489         struct list_head tid_dest_list;
1490         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1491         struct target_core_fabric_ops *tmp_tf_ops;
1492         unsigned char *buf;
1493         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1494         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1495         u32 tpdl, tid_len = 0;
1496         int ret, dest_local_nexus, prf_isid;
1497         u32 dest_rtpi = 0;
1498
1499         memset(dest_iport, 0, 64);
1500         INIT_LIST_HEAD(&tid_dest_list);
1501
1502         local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1503         /*
1504          * Allocate a struct pr_transport_id_holder and setup the
1505          * local_node_acl and local_se_deve pointers and add to
1506          * struct list_head tid_dest_list for add registration
1507          * processing in the loop of tid_dest_list below.
1508          */
1509         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1510         if (!tidh_new) {
1511                 pr_err("Unable to allocate tidh_new\n");
1512                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1513                 return -EINVAL;
1514         }
1515         INIT_LIST_HEAD(&tidh_new->dest_list);
1516         tidh_new->dest_tpg = tpg;
1517         tidh_new->dest_node_acl = se_sess->se_node_acl;
1518         tidh_new->dest_se_deve = local_se_deve;
1519
1520         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1521                                 se_sess->se_node_acl, local_se_deve, l_isid,
1522                                 sa_res_key, all_tg_pt, aptpl);
1523         if (!local_pr_reg) {
1524                 kfree(tidh_new);
1525                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1526                 return -ENOMEM;
1527         }
1528         tidh_new->dest_pr_reg = local_pr_reg;
1529         /*
1530          * The local I_T nexus does not hold any configfs dependances,
1531          * so we set tid_h->dest_local_nexus=1 to prevent the
1532          * configfs_undepend_item() calls in the tid_dest_list loops below.
1533          */
1534         tidh_new->dest_local_nexus = 1;
1535         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1536
1537         buf = transport_kmap_first_data_page(cmd);
1538         /*
1539          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1540          * first extract TransportID Parameter Data Length, and make sure
1541          * the value matches up to the SCSI expected data transfer length.
1542          */
1543         tpdl = (buf[24] & 0xff) << 24;
1544         tpdl |= (buf[25] & 0xff) << 16;
1545         tpdl |= (buf[26] & 0xff) << 8;
1546         tpdl |= buf[27] & 0xff;
1547
1548         if ((tpdl + 28) != cmd->data_length) {
1549                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1550                         " does not equal CDB data_length: %u\n", tpdl,
1551                         cmd->data_length);
1552                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1553                 ret = -EINVAL;
1554                 goto out;
1555         }
1556         /*
1557          * Start processing the received transport IDs using the
1558          * receiving I_T Nexus portal's fabric dependent methods to
1559          * obtain the SCSI Initiator Port/Device Identifiers.
1560          */
1561         ptr = &buf[28];
1562
1563         while (tpdl > 0) {
1564                 proto_ident = (ptr[0] & 0x0f);
1565                 dest_tpg = NULL;
1566
1567                 spin_lock(&dev->se_port_lock);
1568                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1569                         tmp_tpg = tmp_port->sep_tpg;
1570                         if (!tmp_tpg)
1571                                 continue;
1572                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1573                         if (!tmp_tf_ops)
1574                                 continue;
1575                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1576                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1577                                 continue;
1578                         /*
1579                          * Look for the matching proto_ident provided by
1580                          * the received TransportID
1581                          */
1582                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1583                         if (tmp_proto_ident != proto_ident)
1584                                 continue;
1585                         dest_rtpi = tmp_port->sep_rtpi;
1586
1587                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1588                                         tmp_tpg, (const char *)ptr, &tid_len,
1589                                         &iport_ptr);
1590                         if (!i_str)
1591                                 continue;
1592
1593                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1594                         smp_mb__after_atomic_inc();
1595                         spin_unlock(&dev->se_port_lock);
1596
1597                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1598                         if (ret != 0) {
1599                                 pr_err(" core_scsi3_tpg_depend_item()"
1600                                         " for tmp_tpg\n");
1601                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1602                                 smp_mb__after_atomic_dec();
1603                                 cmd->scsi_sense_reason =
1604                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1605                                 ret = -EINVAL;
1606                                 goto out;
1607                         }
1608                         /*
1609                          * Locate the desination initiator ACL to be registered
1610                          * from the decoded fabric module specific TransportID
1611                          * at *i_str.
1612                          */
1613                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1614                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1615                                                 tmp_tpg, i_str);
1616                         if (dest_node_acl) {
1617                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1618                                 smp_mb__after_atomic_inc();
1619                         }
1620                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1621
1622                         if (!dest_node_acl) {
1623                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1624                                 spin_lock(&dev->se_port_lock);
1625                                 continue;
1626                         }
1627
1628                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1629                         if (ret != 0) {
1630                                 pr_err("configfs_depend_item() failed"
1631                                         " for dest_node_acl->acl_group\n");
1632                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1633                                 smp_mb__after_atomic_dec();
1634                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1635                                 cmd->scsi_sense_reason =
1636                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1637                                 ret = -EINVAL;
1638                                 goto out;
1639                         }
1640
1641                         dest_tpg = tmp_tpg;
1642                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1643                                 " %s Port RTPI: %hu\n",
1644                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1645                                 dest_node_acl->initiatorname, dest_rtpi);
1646
1647                         spin_lock(&dev->se_port_lock);
1648                         break;
1649                 }
1650                 spin_unlock(&dev->se_port_lock);
1651
1652                 if (!dest_tpg) {
1653                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1654                                         " dest_tpg\n");
1655                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1656                         ret = -EINVAL;
1657                         goto out;
1658                 }
1659 #if 0
1660                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1661                         " tid_len: %d for %s + %s\n",
1662                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1663                         tpdl, tid_len, i_str, iport_ptr);
1664 #endif
1665                 if (tid_len > tpdl) {
1666                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1667                                 " %u for Transport ID: %s\n", tid_len, ptr);
1668                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669                         core_scsi3_tpg_undepend_item(dest_tpg);
1670                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1671                         ret = -EINVAL;
1672                         goto out;
1673                 }
1674                 /*
1675                  * Locate the desintation struct se_dev_entry pointer for matching
1676                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1677                  * Target Port.
1678                  */
1679                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1680                                         dest_rtpi);
1681                 if (!dest_se_deve) {
1682                         pr_err("Unable to locate %s dest_se_deve"
1683                                 " from destination RTPI: %hu\n",
1684                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1685                                 dest_rtpi);
1686
1687                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1688                         core_scsi3_tpg_undepend_item(dest_tpg);
1689                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1690                         ret = -EINVAL;
1691                         goto out;
1692                 }
1693
1694                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1695                 if (ret < 0) {
1696                         pr_err("core_scsi3_lunacl_depend_item()"
1697                                         " failed\n");
1698                         atomic_dec(&dest_se_deve->pr_ref_count);
1699                         smp_mb__after_atomic_dec();
1700                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1701                         core_scsi3_tpg_undepend_item(dest_tpg);
1702                         cmd->scsi_sense_reason =
1703                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1704                         ret = -EINVAL;
1705                         goto out;
1706                 }
1707 #if 0
1708                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1709                         " dest_se_deve mapped_lun: %u\n",
1710                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1711                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1712 #endif
1713                 /*
1714                  * Skip any TransportIDs that already have a registration for
1715                  * this target port.
1716                  */
1717                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1718                                         iport_ptr);
1719                 if (pr_reg_e) {
1720                         core_scsi3_put_pr_reg(pr_reg_e);
1721                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1722                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1723                         core_scsi3_tpg_undepend_item(dest_tpg);
1724                         ptr += tid_len;
1725                         tpdl -= tid_len;
1726                         tid_len = 0;
1727                         continue;
1728                 }
1729                 /*
1730                  * Allocate a struct pr_transport_id_holder and setup
1731                  * the dest_node_acl and dest_se_deve pointers for the
1732                  * loop below.
1733                  */
1734                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1735                                 GFP_KERNEL);
1736                 if (!tidh_new) {
1737                         pr_err("Unable to allocate tidh_new\n");
1738                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1739                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1740                         core_scsi3_tpg_undepend_item(dest_tpg);
1741                         cmd->scsi_sense_reason =
1742                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1743                         ret = -ENOMEM;
1744                         goto out;
1745                 }
1746                 INIT_LIST_HEAD(&tidh_new->dest_list);
1747                 tidh_new->dest_tpg = dest_tpg;
1748                 tidh_new->dest_node_acl = dest_node_acl;
1749                 tidh_new->dest_se_deve = dest_se_deve;
1750
1751                 /*
1752                  * Allocate, but do NOT add the registration for the
1753                  * TransportID referenced SCSI Initiator port.  This
1754                  * done because of the following from spc4r17 in section
1755                  * 6.14.3 wrt SPEC_I_PT:
1756                  *
1757                  * "If a registration fails for any initiator port (e.g., if th
1758                  * logical unit does not have enough resources available to
1759                  * hold the registration information), no registrations shall be
1760                  * made, and the command shall be terminated with
1761                  * CHECK CONDITION status."
1762                  *
1763                  * That means we call __core_scsi3_alloc_registration() here,
1764                  * and then call __core_scsi3_add_registration() in the
1765                  * 2nd loop which will never fail.
1766                  */
1767                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1768                                 dest_node_acl, dest_se_deve, iport_ptr,
1769                                 sa_res_key, all_tg_pt, aptpl);
1770                 if (!dest_pr_reg) {
1771                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1772                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1773                         core_scsi3_tpg_undepend_item(dest_tpg);
1774                         kfree(tidh_new);
1775                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1776                         ret = -EINVAL;
1777                         goto out;
1778                 }
1779                 tidh_new->dest_pr_reg = dest_pr_reg;
1780                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1781
1782                 ptr += tid_len;
1783                 tpdl -= tid_len;
1784                 tid_len = 0;
1785
1786         }
1787
1788         transport_kunmap_first_data_page(cmd);
1789
1790         /*
1791          * Go ahead and create a registrations from tid_dest_list for the
1792          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1793          * and dest_se_deve.
1794          *
1795          * The SA Reservation Key from the PROUT is set for the
1796          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1797          * means that the TransportID Initiator port will be
1798          * registered on all of the target ports in the SCSI target device
1799          * ALL_TG_PT=0 means the registration will only be for the
1800          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1801          * was received.
1802          */
1803         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1804                 dest_tpg = tidh->dest_tpg;
1805                 dest_node_acl = tidh->dest_node_acl;
1806                 dest_se_deve = tidh->dest_se_deve;
1807                 dest_pr_reg = tidh->dest_pr_reg;
1808                 dest_local_nexus = tidh->dest_local_nexus;
1809
1810                 list_del(&tidh->dest_list);
1811                 kfree(tidh);
1812
1813                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1814                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1815                                                 PR_REG_ISID_ID_LEN);
1816
1817                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1818                                         dest_pr_reg, 0, 0);
1819
1820                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1821                         " registered Transport ID for Node: %s%s Mapped LUN:"
1822                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1823                         dest_node_acl->initiatorname, (prf_isid) ?
1824                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1825
1826                 if (dest_local_nexus)
1827                         continue;
1828
1829                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1830                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1831                 core_scsi3_tpg_undepend_item(dest_tpg);
1832         }
1833
1834         return 0;
1835 out:
1836         transport_kunmap_first_data_page(cmd);
1837         /*
1838          * For the failure case, release everything from tid_dest_list
1839          * including *dest_pr_reg and the configfs dependances..
1840          */
1841         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1842                 dest_tpg = tidh->dest_tpg;
1843                 dest_node_acl = tidh->dest_node_acl;
1844                 dest_se_deve = tidh->dest_se_deve;
1845                 dest_pr_reg = tidh->dest_pr_reg;
1846                 dest_local_nexus = tidh->dest_local_nexus;
1847
1848                 list_del(&tidh->dest_list);
1849                 kfree(tidh);
1850                 /*
1851                  * Release any extra ALL_TG_PT=1 registrations for
1852                  * the SPEC_I_PT=1 case.
1853                  */
1854                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1855                                 &dest_pr_reg->pr_reg_atp_list,
1856                                 pr_reg_atp_mem_list) {
1857                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1858                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1859                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1860                 }
1861
1862                 kfree(dest_pr_reg->pr_aptpl_buf);
1863                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1864
1865                 if (dest_local_nexus)
1866                         continue;
1867
1868                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1869                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1870                 core_scsi3_tpg_undepend_item(dest_tpg);
1871         }
1872         return ret;
1873 }
1874
1875 /*
1876  * Called with struct se_device->dev_reservation_lock held
1877  */
1878 static int __core_scsi3_update_aptpl_buf(
1879         struct se_device *dev,
1880         unsigned char *buf,
1881         u32 pr_aptpl_buf_len,
1882         int clear_aptpl_metadata)
1883 {
1884         struct se_lun *lun;
1885         struct se_portal_group *tpg;
1886         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1887         struct t10_pr_registration *pr_reg;
1888         unsigned char tmp[512], isid_buf[32];
1889         ssize_t len = 0;
1890         int reg_count = 0;
1891
1892         memset(buf, 0, pr_aptpl_buf_len);
1893         /*
1894          * Called to clear metadata once APTPL has been deactivated.
1895          */
1896         if (clear_aptpl_metadata) {
1897                 snprintf(buf, pr_aptpl_buf_len,
1898                                 "No Registrations or Reservations\n");
1899                 return 0;
1900         }
1901         /*
1902          * Walk the registration list..
1903          */
1904         spin_lock(&su_dev->t10_pr.registration_lock);
1905         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1906                         pr_reg_list) {
1907
1908                 tmp[0] = '\0';
1909                 isid_buf[0] = '\0';
1910                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1911                 lun = pr_reg->pr_reg_tg_pt_lun;
1912                 /*
1913                  * Write out any ISID value to APTPL metadata that was included
1914                  * in the original registration.
1915                  */
1916                 if (pr_reg->isid_present_at_reg)
1917                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1918                                         pr_reg->pr_reg_isid);
1919                 /*
1920                  * Include special metadata if the pr_reg matches the
1921                  * reservation holder.
1922                  */
1923                 if (dev->dev_pr_res_holder == pr_reg) {
1924                         snprintf(tmp, 512, "PR_REG_START: %d"
1925                                 "\ninitiator_fabric=%s\n"
1926                                 "initiator_node=%s\n%s"
1927                                 "sa_res_key=%llu\n"
1928                                 "res_holder=1\nres_type=%02x\n"
1929                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1930                                 "mapped_lun=%u\n", reg_count,
1931                                 tpg->se_tpg_tfo->get_fabric_name(),
1932                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1933                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1934                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1935                                 pr_reg->pr_res_mapped_lun);
1936                 } else {
1937                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1938                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1939                                 "sa_res_key=%llu\nres_holder=0\n"
1940                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1941                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1942                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1943                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1944                                 pr_reg->pr_res_mapped_lun);
1945                 }
1946
1947                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1948                         pr_err("Unable to update renaming"
1949                                 " APTPL metadata\n");
1950                         spin_unlock(&su_dev->t10_pr.registration_lock);
1951                         return -EMSGSIZE;
1952                 }
1953                 len += sprintf(buf+len, "%s", tmp);
1954
1955                 /*
1956                  * Include information about the associated SCSI target port.
1957                  */
1958                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1959                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1960                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1961                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1962                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1963                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1964
1965                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1966                         pr_err("Unable to update renaming"
1967                                 " APTPL metadata\n");
1968                         spin_unlock(&su_dev->t10_pr.registration_lock);
1969                         return -EMSGSIZE;
1970                 }
1971                 len += sprintf(buf+len, "%s", tmp);
1972                 reg_count++;
1973         }
1974         spin_unlock(&su_dev->t10_pr.registration_lock);
1975
1976         if (!reg_count)
1977                 len += sprintf(buf+len, "No Registrations or Reservations");
1978
1979         return 0;
1980 }
1981
1982 static int core_scsi3_update_aptpl_buf(
1983         struct se_device *dev,
1984         unsigned char *buf,
1985         u32 pr_aptpl_buf_len,
1986         int clear_aptpl_metadata)
1987 {
1988         int ret;
1989
1990         spin_lock(&dev->dev_reservation_lock);
1991         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1992                                 clear_aptpl_metadata);
1993         spin_unlock(&dev->dev_reservation_lock);
1994
1995         return ret;
1996 }
1997
1998 /*
1999  * Called with struct se_device->aptpl_file_mutex held
2000  */
2001 static int __core_scsi3_write_aptpl_to_file(
2002         struct se_device *dev,
2003         unsigned char *buf,
2004         u32 pr_aptpl_buf_len)
2005 {
2006         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
2007         struct file *file;
2008         struct iovec iov[1];
2009         mm_segment_t old_fs;
2010         int flags = O_RDWR | O_CREAT | O_TRUNC;
2011         char path[512];
2012         int ret;
2013
2014         memset(iov, 0, sizeof(struct iovec));
2015         memset(path, 0, 512);
2016
2017         if (strlen(&wwn->unit_serial[0]) >= 512) {
2018                 pr_err("WWN value for struct se_device does not fit"
2019                         " into path buffer\n");
2020                 return -EMSGSIZE;
2021         }
2022
2023         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2024         file = filp_open(path, flags, 0600);
2025         if (IS_ERR(file) || !file || !file->f_dentry) {
2026                 pr_err("filp_open(%s) for APTPL metadata"
2027                         " failed\n", path);
2028                 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2029         }
2030
2031         iov[0].iov_base = &buf[0];
2032         if (!pr_aptpl_buf_len)
2033                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2034         else
2035                 iov[0].iov_len = pr_aptpl_buf_len;
2036
2037         old_fs = get_fs();
2038         set_fs(get_ds());
2039         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2040         set_fs(old_fs);
2041
2042         if (ret < 0) {
2043                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2044                 filp_close(file, NULL);
2045                 return -EIO;
2046         }
2047         filp_close(file, NULL);
2048
2049         return 0;
2050 }
2051
2052 static int core_scsi3_update_and_write_aptpl(
2053         struct se_device *dev,
2054         unsigned char *in_buf,
2055         u32 in_pr_aptpl_buf_len)
2056 {
2057         unsigned char null_buf[64], *buf;
2058         u32 pr_aptpl_buf_len;
2059         int ret, clear_aptpl_metadata = 0;
2060         /*
2061          * Can be called with a NULL pointer from PROUT service action CLEAR
2062          */
2063         if (!in_buf) {
2064                 memset(null_buf, 0, 64);
2065                 buf = &null_buf[0];
2066                 /*
2067                  * This will clear the APTPL metadata to:
2068                  * "No Registrations or Reservations" status
2069                  */
2070                 pr_aptpl_buf_len = 64;
2071                 clear_aptpl_metadata = 1;
2072         } else {
2073                 buf = in_buf;
2074                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2075         }
2076
2077         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2078                                 clear_aptpl_metadata);
2079         if (ret != 0)
2080                 return ret;
2081         /*
2082          * __core_scsi3_write_aptpl_to_file() will call strlen()
2083          * on the passed buf to determine pr_aptpl_buf_len.
2084          */
2085         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2086         if (ret != 0)
2087                 return ret;
2088
2089         return ret;
2090 }
2091
2092 static int core_scsi3_emulate_pro_register(
2093         struct se_cmd *cmd,
2094         u64 res_key,
2095         u64 sa_res_key,
2096         int aptpl,
2097         int all_tg_pt,
2098         int spec_i_pt,
2099         int ignore_key)
2100 {
2101         struct se_session *se_sess = cmd->se_sess;
2102         struct se_device *dev = cmd->se_dev;
2103         struct se_dev_entry *se_deve;
2104         struct se_lun *se_lun = cmd->se_lun;
2105         struct se_portal_group *se_tpg;
2106         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2107         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2108         /* Used for APTPL metadata w/ UNREGISTER */
2109         unsigned char *pr_aptpl_buf = NULL;
2110         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2111         int pr_holder = 0, ret = 0, type;
2112
2113         if (!se_sess || !se_lun) {
2114                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2115                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2116                 return -EINVAL;
2117         }
2118         se_tpg = se_sess->se_tpg;
2119         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2120
2121         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2122                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2123                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2124                                 PR_REG_ISID_LEN);
2125                 isid_ptr = &isid_buf[0];
2126         }
2127         /*
2128          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2129          */
2130         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2131         if (!pr_reg_e) {
2132                 if (res_key) {
2133                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2134                                 " for SA REGISTER, returning CONFLICT\n");
2135                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2136                         return -EINVAL;
2137                 }
2138                 /*
2139                  * Do nothing but return GOOD status.
2140                  */
2141                 if (!sa_res_key)
2142                         return 0;
2143
2144                 if (!spec_i_pt) {
2145                         /*
2146                          * Perform the Service Action REGISTER on the Initiator
2147                          * Port Endpoint that the PRO was received from on the
2148                          * Logical Unit of the SCSI device server.
2149                          */
2150                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2151                                         se_sess->se_node_acl, se_deve, isid_ptr,
2152                                         sa_res_key, all_tg_pt, aptpl,
2153                                         ignore_key, 0);
2154                         if (ret != 0) {
2155                                 pr_err("Unable to allocate"
2156                                         " struct t10_pr_registration\n");
2157                                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2158                                 return -EINVAL;
2159                         }
2160                 } else {
2161                         /*
2162                          * Register both the Initiator port that received
2163                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2164                          * TransportID from Parameter list and loop through
2165                          * fabric dependent parameter list while calling
2166                          * logic from of core_scsi3_alloc_registration() for
2167                          * each TransportID provided SCSI Initiator Port/Device
2168                          */
2169                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2170                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2171                         if (ret != 0)
2172                                 return ret;
2173                 }
2174                 /*
2175                  * Nothing left to do for the APTPL=0 case.
2176                  */
2177                 if (!aptpl) {
2178                         pr_tmpl->pr_aptpl_active = 0;
2179                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2180                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2181                                         " REGISTER\n");
2182                         return 0;
2183                 }
2184                 /*
2185                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2186                  * update the APTPL metadata information using its
2187                  * preallocated *pr_reg->pr_aptpl_buf.
2188                  */
2189                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2190                                 se_sess->se_node_acl, se_sess);
2191
2192                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2193                                 &pr_reg->pr_aptpl_buf[0],
2194                                 pr_tmpl->pr_aptpl_buf_len);
2195                 if (!ret) {
2196                         pr_tmpl->pr_aptpl_active = 1;
2197                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2198                 }
2199
2200                 core_scsi3_put_pr_reg(pr_reg);
2201                 return ret;
2202         } else {
2203                 /*
2204                  * Locate the existing *pr_reg via struct se_node_acl pointers
2205                  */
2206                 pr_reg = pr_reg_e;
2207                 type = pr_reg->pr_res_type;
2208
2209                 if (!ignore_key) {
2210                         if (res_key != pr_reg->pr_res_key) {
2211                                 pr_err("SPC-3 PR REGISTER: Received"
2212                                         " res_key: 0x%016Lx does not match"
2213                                         " existing SA REGISTER res_key:"
2214                                         " 0x%016Lx\n", res_key,
2215                                         pr_reg->pr_res_key);
2216                                 core_scsi3_put_pr_reg(pr_reg);
2217                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2218                                 return -EINVAL;
2219                         }
2220                 }
2221                 if (spec_i_pt) {
2222                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2223                                 " set while sa_res_key=0\n");
2224                         core_scsi3_put_pr_reg(pr_reg);
2225                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2226                         return -EINVAL;
2227                 }
2228                 /*
2229                  * An existing ALL_TG_PT=1 registration being released
2230                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2231                  */
2232                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2233                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2234                                 " registration exists, but ALL_TG_PT=1 bit not"
2235                                 " present in received PROUT\n");
2236                         core_scsi3_put_pr_reg(pr_reg);
2237                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2238                         return -EINVAL;
2239                 }
2240                 /*
2241                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2242                  */
2243                 if (aptpl) {
2244                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2245                                                 GFP_KERNEL);
2246                         if (!pr_aptpl_buf) {
2247                                 pr_err("Unable to allocate"
2248                                         " pr_aptpl_buf\n");
2249                                 core_scsi3_put_pr_reg(pr_reg);
2250                                 cmd->scsi_sense_reason =
2251                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2252                                 return -EINVAL;
2253                         }
2254                 }
2255                 /*
2256                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2257                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2258                  * Nexus.
2259                  */
2260                 if (!sa_res_key) {
2261                         pr_holder = core_scsi3_check_implict_release(
2262                                         cmd->se_dev, pr_reg);
2263                         if (pr_holder < 0) {
2264                                 kfree(pr_aptpl_buf);
2265                                 core_scsi3_put_pr_reg(pr_reg);
2266                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2267                                 return -EINVAL;
2268                         }
2269
2270                         spin_lock(&pr_tmpl->registration_lock);
2271                         /*
2272                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2273                          * and matching pr_res_key.
2274                          */
2275                         if (pr_reg->pr_reg_all_tg_pt) {
2276                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2277                                                 &pr_tmpl->registration_list,
2278                                                 pr_reg_list) {
2279
2280                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2281                                                 continue;
2282
2283                                         if (pr_reg_p->pr_res_key != res_key)
2284                                                 continue;
2285
2286                                         if (pr_reg == pr_reg_p)
2287                                                 continue;
2288
2289                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2290                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2291                                                 continue;
2292
2293                                         __core_scsi3_free_registration(dev,
2294                                                         pr_reg_p, NULL, 0);
2295                                 }
2296                         }
2297                         /*
2298                          * Release the calling I_T Nexus registration now..
2299                          */
2300                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2301                                                         NULL, 1);
2302                         /*
2303                          * From spc4r17, section 5.7.11.3 Unregistering
2304                          *
2305                          * If the persistent reservation is a registrants only
2306                          * type, the device server shall establish a unit
2307                          * attention condition for the initiator port associated
2308                          * with every registered I_T nexus except for the I_T
2309                          * nexus on which the PERSISTENT RESERVE OUT command was
2310                          * received, with the additional sense code set to
2311                          * RESERVATIONS RELEASED.
2312                          */
2313                         if (pr_holder &&
2314                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2315                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2316                                 list_for_each_entry(pr_reg_p,
2317                                                 &pr_tmpl->registration_list,
2318                                                 pr_reg_list) {
2319
2320                                         core_scsi3_ua_allocate(
2321                                                 pr_reg_p->pr_reg_nacl,
2322                                                 pr_reg_p->pr_res_mapped_lun,
2323                                                 0x2A,
2324                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2325                                 }
2326                         }
2327                         spin_unlock(&pr_tmpl->registration_lock);
2328
2329                         if (!aptpl) {
2330                                 pr_tmpl->pr_aptpl_active = 0;
2331                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2332                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2333                                                 " for UNREGISTER\n");
2334                                 return 0;
2335                         }
2336
2337                         ret = core_scsi3_update_and_write_aptpl(dev,
2338                                         &pr_aptpl_buf[0],
2339                                         pr_tmpl->pr_aptpl_buf_len);
2340                         if (!ret) {
2341                                 pr_tmpl->pr_aptpl_active = 1;
2342                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2343                                                 " for UNREGISTER\n");
2344                         }
2345
2346                         kfree(pr_aptpl_buf);
2347                         return ret;
2348                 } else {
2349                         /*
2350                          * Increment PRgeneration counter for struct se_device"
2351                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2352                          * READ_KEYS service action.
2353                          */
2354                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2355                                                         cmd->se_dev);
2356                         pr_reg->pr_res_key = sa_res_key;
2357                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2358                                 " Key for %s to: 0x%016Lx PRgeneration:"
2359                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2360                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2361                                 pr_reg->pr_reg_nacl->initiatorname,
2362                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2363
2364                         if (!aptpl) {
2365                                 pr_tmpl->pr_aptpl_active = 0;
2366                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2367                                 core_scsi3_put_pr_reg(pr_reg);
2368                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2369                                                 " for REGISTER\n");
2370                                 return 0;
2371                         }
2372
2373                         ret = core_scsi3_update_and_write_aptpl(dev,
2374                                         &pr_aptpl_buf[0],
2375                                         pr_tmpl->pr_aptpl_buf_len);
2376                         if (!ret) {
2377                                 pr_tmpl->pr_aptpl_active = 1;
2378                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2379                                                 " for REGISTER\n");
2380                         }
2381
2382                         kfree(pr_aptpl_buf);
2383                         core_scsi3_put_pr_reg(pr_reg);
2384                 }
2385         }
2386         return 0;
2387 }
2388
2389 unsigned char *core_scsi3_pr_dump_type(int type)
2390 {
2391         switch (type) {
2392         case PR_TYPE_WRITE_EXCLUSIVE:
2393                 return "Write Exclusive Access";
2394         case PR_TYPE_EXCLUSIVE_ACCESS:
2395                 return "Exclusive Access";
2396         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2397                 return "Write Exclusive Access, Registrants Only";
2398         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2399                 return "Exclusive Access, Registrants Only";
2400         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2401                 return "Write Exclusive Access, All Registrants";
2402         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2403                 return "Exclusive Access, All Registrants";
2404         default:
2405                 break;
2406         }
2407
2408         return "Unknown SPC-3 PR Type";
2409 }
2410
2411 static int core_scsi3_pro_reserve(
2412         struct se_cmd *cmd,
2413         struct se_device *dev,
2414         int type,
2415         int scope,
2416         u64 res_key)
2417 {
2418         struct se_session *se_sess = cmd->se_sess;
2419         struct se_dev_entry *se_deve;
2420         struct se_lun *se_lun = cmd->se_lun;
2421         struct se_portal_group *se_tpg;
2422         struct t10_pr_registration *pr_reg, *pr_res_holder;
2423         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2424         char i_buf[PR_REG_ISID_ID_LEN];
2425         int ret, prf_isid;
2426
2427         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2428
2429         if (!se_sess || !se_lun) {
2430                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2431                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2432                 return -EINVAL;
2433         }
2434         se_tpg = se_sess->se_tpg;
2435         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2436         /*
2437          * Locate the existing *pr_reg via struct se_node_acl pointers
2438          */
2439         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2440                                 se_sess);
2441         if (!pr_reg) {
2442                 pr_err("SPC-3 PR: Unable to locate"
2443                         " PR_REGISTERED *pr_reg for RESERVE\n");
2444                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2445                 return -EINVAL;
2446         }
2447         /*
2448          * From spc4r17 Section 5.7.9: Reserving:
2449          *
2450          * An application client creates a persistent reservation by issuing
2451          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2452          * a registered I_T nexus with the following parameters:
2453          *    a) RESERVATION KEY set to the value of the reservation key that is
2454          *       registered with the logical unit for the I_T nexus; and
2455          */
2456         if (res_key != pr_reg->pr_res_key) {
2457                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2458                         " does not match existing SA REGISTER res_key:"
2459                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2460                 core_scsi3_put_pr_reg(pr_reg);
2461                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2462                 return -EINVAL;
2463         }
2464         /*
2465          * From spc4r17 Section 5.7.9: Reserving:
2466          *
2467          * From above:
2468          *  b) TYPE field and SCOPE field set to the persistent reservation
2469          *     being created.
2470          *
2471          * Only one persistent reservation is allowed at a time per logical unit
2472          * and that persistent reservation has a scope of LU_SCOPE.
2473          */
2474         if (scope != PR_SCOPE_LU_SCOPE) {
2475                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2476                 core_scsi3_put_pr_reg(pr_reg);
2477                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2478                 return -EINVAL;
2479         }
2480         /*
2481          * See if we have an existing PR reservation holder pointer at
2482          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2483          * *pr_res_holder.
2484          */
2485         spin_lock(&dev->dev_reservation_lock);
2486         pr_res_holder = dev->dev_pr_res_holder;
2487         if ((pr_res_holder)) {
2488                 /*
2489                  * From spc4r17 Section 5.7.9: Reserving:
2490                  *
2491                  * If the device server receives a PERSISTENT RESERVE OUT
2492                  * command from an I_T nexus other than a persistent reservation
2493                  * holder (see 5.7.10) that attempts to create a persistent
2494                  * reservation when a persistent reservation already exists for
2495                  * the logical unit, then the command shall be completed with
2496                  * RESERVATION CONFLICT status.
2497                  */
2498                 if (pr_res_holder != pr_reg) {
2499                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2500                         pr_err("SPC-3 PR: Attempted RESERVE from"
2501                                 " [%s]: %s while reservation already held by"
2502                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2503                                 cmd->se_tfo->get_fabric_name(),
2504                                 se_sess->se_node_acl->initiatorname,
2505                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2506                                 pr_res_holder->pr_reg_nacl->initiatorname);
2507
2508                         spin_unlock(&dev->dev_reservation_lock);
2509                         core_scsi3_put_pr_reg(pr_reg);
2510                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2511                         return -EINVAL;
2512                 }
2513                 /*
2514                  * From spc4r17 Section 5.7.9: Reserving:
2515                  *
2516                  * If a persistent reservation holder attempts to modify the
2517                  * type or scope of an existing persistent reservation, the
2518                  * command shall be completed with RESERVATION CONFLICT status.
2519                  */
2520                 if ((pr_res_holder->pr_res_type != type) ||
2521                     (pr_res_holder->pr_res_scope != scope)) {
2522                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2523                         pr_err("SPC-3 PR: Attempted RESERVE from"
2524                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2525                                 " while reservation already held by [%s]: %s,"
2526                                 " returning RESERVATION_CONFLICT\n",
2527                                 cmd->se_tfo->get_fabric_name(),
2528                                 se_sess->se_node_acl->initiatorname,
2529                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2530                                 pr_res_holder->pr_reg_nacl->initiatorname);
2531
2532                         spin_unlock(&dev->dev_reservation_lock);
2533                         core_scsi3_put_pr_reg(pr_reg);
2534                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2535                         return -EINVAL;
2536                 }
2537                 /*
2538                  * From spc4r17 Section 5.7.9: Reserving:
2539                  *
2540                  * If the device server receives a PERSISTENT RESERVE OUT
2541                  * command with RESERVE service action where the TYPE field and
2542                  * the SCOPE field contain the same values as the existing type
2543                  * and scope from a persistent reservation holder, it shall not
2544                  * make any change to the existing persistent reservation and
2545                  * shall completethe command with GOOD status.
2546                  */
2547                 spin_unlock(&dev->dev_reservation_lock);
2548                 core_scsi3_put_pr_reg(pr_reg);
2549                 return 0;
2550         }
2551         /*
2552          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2553          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2554          */
2555         pr_reg->pr_res_scope = scope;
2556         pr_reg->pr_res_type = type;
2557         pr_reg->pr_res_holder = 1;
2558         dev->dev_pr_res_holder = pr_reg;
2559         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2560                                 PR_REG_ISID_ID_LEN);
2561
2562         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2563                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2564                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2565                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2566         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2567                         cmd->se_tfo->get_fabric_name(),
2568                         se_sess->se_node_acl->initiatorname,
2569                         (prf_isid) ? &i_buf[0] : "");
2570         spin_unlock(&dev->dev_reservation_lock);
2571
2572         if (pr_tmpl->pr_aptpl_active) {
2573                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2574                                 &pr_reg->pr_aptpl_buf[0],
2575                                 pr_tmpl->pr_aptpl_buf_len);
2576                 if (!ret)
2577                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2578                                         " for RESERVE\n");
2579         }
2580
2581         core_scsi3_put_pr_reg(pr_reg);
2582         return 0;
2583 }
2584
2585 static int core_scsi3_emulate_pro_reserve(
2586         struct se_cmd *cmd,
2587         int type,
2588         int scope,
2589         u64 res_key)
2590 {
2591         struct se_device *dev = cmd->se_dev;
2592         int ret = 0;
2593
2594         switch (type) {
2595         case PR_TYPE_WRITE_EXCLUSIVE:
2596         case PR_TYPE_EXCLUSIVE_ACCESS:
2597         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2598         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2599         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2600         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2601                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2602                 break;
2603         default:
2604                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2605                         " 0x%02x\n", type);
2606                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2607                 return -EINVAL;
2608         }
2609
2610         return ret;
2611 }
2612
2613 /*
2614  * Called with struct se_device->dev_reservation_lock held.
2615  */
2616 static void __core_scsi3_complete_pro_release(
2617         struct se_device *dev,
2618         struct se_node_acl *se_nacl,
2619         struct t10_pr_registration *pr_reg,
2620         int explict)
2621 {
2622         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2623         char i_buf[PR_REG_ISID_ID_LEN];
2624         int prf_isid;
2625
2626         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2627         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2628                                 PR_REG_ISID_ID_LEN);
2629         /*
2630          * Go ahead and release the current PR reservation holder.
2631          */
2632         dev->dev_pr_res_holder = NULL;
2633
2634         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2635                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2636                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2637                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2638                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2639         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2640                 tfo->get_fabric_name(), se_nacl->initiatorname,
2641                 (prf_isid) ? &i_buf[0] : "");
2642         /*
2643          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2644          */
2645         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2646 }
2647
2648 static int core_scsi3_emulate_pro_release(
2649         struct se_cmd *cmd,
2650         int type,
2651         int scope,
2652         u64 res_key)
2653 {
2654         struct se_device *dev = cmd->se_dev;
2655         struct se_session *se_sess = cmd->se_sess;
2656         struct se_lun *se_lun = cmd->se_lun;
2657         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2658         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2659         int ret, all_reg = 0;
2660
2661         if (!se_sess || !se_lun) {
2662                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2663                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2664                 return -EINVAL;
2665         }
2666         /*
2667          * Locate the existing *pr_reg via struct se_node_acl pointers
2668          */
2669         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2670         if (!pr_reg) {
2671                 pr_err("SPC-3 PR: Unable to locate"
2672                         " PR_REGISTERED *pr_reg for RELEASE\n");
2673                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2674                 return -EINVAL;
2675         }
2676         /*
2677          * From spc4r17 Section 5.7.11.2 Releasing:
2678          *
2679          * If there is no persistent reservation or in response to a persistent
2680          * reservation release request from a registered I_T nexus that is not a
2681          * persistent reservation holder (see 5.7.10), the device server shall
2682          * do the following:
2683          *
2684          *     a) Not release the persistent reservation, if any;
2685          *     b) Not remove any registrations; and
2686          *     c) Complete the command with GOOD status.
2687          */
2688         spin_lock(&dev->dev_reservation_lock);
2689         pr_res_holder = dev->dev_pr_res_holder;
2690         if (!pr_res_holder) {
2691                 /*
2692                  * No persistent reservation, return GOOD status.
2693                  */
2694                 spin_unlock(&dev->dev_reservation_lock);
2695                 core_scsi3_put_pr_reg(pr_reg);
2696                 return 0;
2697         }
2698         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2699             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2700                 all_reg = 1;
2701
2702         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2703                 /*
2704                  * Non 'All Registrants' PR Type cases..
2705                  * Release request from a registered I_T nexus that is not a
2706                  * persistent reservation holder. return GOOD status.
2707                  */
2708                 spin_unlock(&dev->dev_reservation_lock);
2709                 core_scsi3_put_pr_reg(pr_reg);
2710                 return 0;
2711         }
2712         /*
2713          * From spc4r17 Section 5.7.11.2 Releasing:
2714          *
2715          * Only the persistent reservation holder (see 5.7.10) is allowed to
2716          * release a persistent reservation.
2717          *
2718          * An application client releases the persistent reservation by issuing
2719          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2720          * an I_T nexus that is a persistent reservation holder with the
2721          * following parameters:
2722          *
2723          *     a) RESERVATION KEY field set to the value of the reservation key
2724          *        that is registered with the logical unit for the I_T nexus;
2725          */
2726         if (res_key != pr_reg->pr_res_key) {
2727                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2728                         " does not match existing SA REGISTER res_key:"
2729                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2730                 spin_unlock(&dev->dev_reservation_lock);
2731                 core_scsi3_put_pr_reg(pr_reg);
2732                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2733                 return -EINVAL;
2734         }
2735         /*
2736          * From spc4r17 Section 5.7.11.2 Releasing and above:
2737          *
2738          * b) TYPE field and SCOPE field set to match the persistent
2739          *    reservation being released.
2740          */
2741         if ((pr_res_holder->pr_res_type != type) ||
2742             (pr_res_holder->pr_res_scope != scope)) {
2743                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2744                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2745                         " reservation from [%s]: %s with different TYPE "
2746                         "and/or SCOPE  while reservation already held by"
2747                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2748                         cmd->se_tfo->get_fabric_name(),
2749                         se_sess->se_node_acl->initiatorname,
2750                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2751                         pr_res_holder->pr_reg_nacl->initiatorname);
2752
2753                 spin_unlock(&dev->dev_reservation_lock);
2754                 core_scsi3_put_pr_reg(pr_reg);
2755                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2756                 return -EINVAL;
2757         }
2758         /*
2759          * In response to a persistent reservation release request from the
2760          * persistent reservation holder the device server shall perform a
2761          * release by doing the following as an uninterrupted series of actions:
2762          * a) Release the persistent reservation;
2763          * b) Not remove any registration(s);
2764          * c) If the released persistent reservation is a registrants only type
2765          * or all registrants type persistent reservation,
2766          *    the device server shall establish a unit attention condition for
2767          *    the initiator port associated with every regis-
2768          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2769          *    RESERVE OUT command with RELEASE service action was received,
2770          *    with the additional sense code set to RESERVATIONS RELEASED; and
2771          * d) If the persistent reservation is of any other type, the device
2772          *    server shall not establish a unit attention condition.
2773          */
2774         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2775                         pr_reg, 1);
2776
2777         spin_unlock(&dev->dev_reservation_lock);
2778
2779         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2780             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2781             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2782             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2783                 /*
2784                  * If no UNIT ATTENTION conditions will be established for
2785                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2786                  * go ahead and check for APTPL=1 update+write below
2787                  */
2788                 goto write_aptpl;
2789         }
2790
2791         spin_lock(&pr_tmpl->registration_lock);
2792         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2793                         pr_reg_list) {
2794                 /*
2795                  * Do not establish a UNIT ATTENTION condition
2796                  * for the calling I_T Nexus
2797                  */
2798                 if (pr_reg_p == pr_reg)
2799                         continue;
2800
2801                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2802                                 pr_reg_p->pr_res_mapped_lun,
2803                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2804         }
2805         spin_unlock(&pr_tmpl->registration_lock);
2806
2807 write_aptpl:
2808         if (pr_tmpl->pr_aptpl_active) {
2809                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2810                                 &pr_reg->pr_aptpl_buf[0],
2811                                 pr_tmpl->pr_aptpl_buf_len);
2812                 if (!ret)
2813                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2814         }
2815
2816         core_scsi3_put_pr_reg(pr_reg);
2817         return 0;
2818 }
2819
2820 static int core_scsi3_emulate_pro_clear(
2821         struct se_cmd *cmd,
2822         u64 res_key)
2823 {
2824         struct se_device *dev = cmd->se_dev;
2825         struct se_node_acl *pr_reg_nacl;
2826         struct se_session *se_sess = cmd->se_sess;
2827         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2828         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2829         u32 pr_res_mapped_lun = 0;
2830         int calling_it_nexus = 0;
2831         /*
2832          * Locate the existing *pr_reg via struct se_node_acl pointers
2833          */
2834         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2835                         se_sess->se_node_acl, se_sess);
2836         if (!pr_reg_n) {
2837                 pr_err("SPC-3 PR: Unable to locate"
2838                         " PR_REGISTERED *pr_reg for CLEAR\n");
2839                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2840                 return -EINVAL;
2841         }
2842         /*
2843          * From spc4r17 section 5.7.11.6, Clearing:
2844          *
2845          * Any application client may release the persistent reservation and
2846          * remove all registrations from a device server by issuing a
2847          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2848          * registered I_T nexus with the following parameter:
2849          *
2850          *      a) RESERVATION KEY field set to the value of the reservation key
2851          *         that is registered with the logical unit for the I_T nexus.
2852          */
2853         if (res_key != pr_reg_n->pr_res_key) {
2854                 pr_err("SPC-3 PR REGISTER: Received"
2855                         " res_key: 0x%016Lx does not match"
2856                         " existing SA REGISTER res_key:"
2857                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2858                 core_scsi3_put_pr_reg(pr_reg_n);
2859                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2860                 return -EINVAL;
2861         }
2862         /*
2863          * a) Release the persistent reservation, if any;
2864          */
2865         spin_lock(&dev->dev_reservation_lock);
2866         pr_res_holder = dev->dev_pr_res_holder;
2867         if (pr_res_holder) {
2868                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2869                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2870                         pr_res_holder, 0);
2871         }
2872         spin_unlock(&dev->dev_reservation_lock);
2873         /*
2874          * b) Remove all registration(s) (see spc4r17 5.7.7);
2875          */
2876         spin_lock(&pr_tmpl->registration_lock);
2877         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2878                         &pr_tmpl->registration_list, pr_reg_list) {
2879
2880                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2881                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2882                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2883                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2884                                         calling_it_nexus);
2885                 /*
2886                  * e) Establish a unit attention condition for the initiator
2887                  *    port associated with every registered I_T nexus other
2888                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2889                  *    command with CLEAR service action was received, with the
2890                  *    additional sense code set to RESERVATIONS PREEMPTED.
2891                  */
2892                 if (!calling_it_nexus)
2893                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2894                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2895         }
2896         spin_unlock(&pr_tmpl->registration_lock);
2897
2898         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2899                 cmd->se_tfo->get_fabric_name());
2900
2901         if (pr_tmpl->pr_aptpl_active) {
2902                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2903                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2904                                 " for CLEAR\n");
2905         }
2906
2907         core_scsi3_pr_generation(dev);
2908         return 0;
2909 }
2910
2911 /*
2912  * Called with struct se_device->dev_reservation_lock held.
2913  */
2914 static void __core_scsi3_complete_pro_preempt(
2915         struct se_device *dev,
2916         struct t10_pr_registration *pr_reg,
2917         struct list_head *preempt_and_abort_list,
2918         int type,
2919         int scope,
2920         int abort)
2921 {
2922         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2923         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2924         char i_buf[PR_REG_ISID_ID_LEN];
2925         int prf_isid;
2926
2927         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2928         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2929                                 PR_REG_ISID_ID_LEN);
2930         /*
2931          * Do an implict RELEASE of the existing reservation.
2932          */
2933         if (dev->dev_pr_res_holder)
2934                 __core_scsi3_complete_pro_release(dev, nacl,
2935                                 dev->dev_pr_res_holder, 0);
2936
2937         dev->dev_pr_res_holder = pr_reg;
2938         pr_reg->pr_res_holder = 1;
2939         pr_reg->pr_res_type = type;
2940         pr_reg->pr_res_scope = scope;
2941
2942         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2943                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2944                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2945                 core_scsi3_pr_dump_type(type),
2946                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2947         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2948                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2949                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2950         /*
2951          * For PREEMPT_AND_ABORT, add the preempting reservation's
2952          * struct t10_pr_registration to the list that will be compared
2953          * against received CDBs..
2954          */
2955         if (preempt_and_abort_list)
2956                 list_add_tail(&pr_reg->pr_reg_abort_list,
2957                                 preempt_and_abort_list);
2958 }
2959
2960 static void core_scsi3_release_preempt_and_abort(
2961         struct list_head *preempt_and_abort_list,
2962         struct t10_pr_registration *pr_reg_holder)
2963 {
2964         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2965
2966         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2967                                 pr_reg_abort_list) {
2968
2969                 list_del(&pr_reg->pr_reg_abort_list);
2970                 if (pr_reg_holder == pr_reg)
2971                         continue;
2972                 if (pr_reg->pr_res_holder) {
2973                         pr_warn("pr_reg->pr_res_holder still set\n");
2974                         continue;
2975                 }
2976
2977                 pr_reg->pr_reg_deve = NULL;
2978                 pr_reg->pr_reg_nacl = NULL;
2979                 kfree(pr_reg->pr_aptpl_buf);
2980                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2981         }
2982 }
2983
2984 static int core_scsi3_pro_preempt(
2985         struct se_cmd *cmd,
2986         int type,
2987         int scope,
2988         u64 res_key,
2989         u64 sa_res_key,
2990         int abort)
2991 {
2992         struct se_device *dev = cmd->se_dev;
2993         struct se_dev_entry *se_deve;
2994         struct se_node_acl *pr_reg_nacl;
2995         struct se_session *se_sess = cmd->se_sess;
2996         struct list_head preempt_and_abort_list;
2997         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2998         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2999         u32 pr_res_mapped_lun = 0;
3000         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
3001         int prh_type = 0, prh_scope = 0, ret;
3002
3003         if (!se_sess) {
3004                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3005                 return -EINVAL;
3006         }
3007
3008         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3009         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3010                                 se_sess);
3011         if (!pr_reg_n) {
3012                 pr_err("SPC-3 PR: Unable to locate"
3013                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
3014                         (abort) ? "_AND_ABORT" : "");
3015                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3016                 return -EINVAL;
3017         }
3018         if (pr_reg_n->pr_res_key != res_key) {
3019                 core_scsi3_put_pr_reg(pr_reg_n);
3020                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3021                 return -EINVAL;
3022         }
3023         if (scope != PR_SCOPE_LU_SCOPE) {
3024                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
3025                 core_scsi3_put_pr_reg(pr_reg_n);
3026                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3027                 return -EINVAL;
3028         }
3029         INIT_LIST_HEAD(&preempt_and_abort_list);
3030
3031         spin_lock(&dev->dev_reservation_lock);
3032         pr_res_holder = dev->dev_pr_res_holder;
3033         if (pr_res_holder &&
3034            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3035             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3036                 all_reg = 1;
3037
3038         if (!all_reg && !sa_res_key) {
3039                 spin_unlock(&dev->dev_reservation_lock);
3040                 core_scsi3_put_pr_reg(pr_reg_n);
3041                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3042                 return -EINVAL;
3043         }
3044         /*
3045          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3046          *
3047          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3048          * persistent reservation holder or there is no persistent reservation
3049          * holder (i.e., there is no persistent reservation), then the device
3050          * server shall perform a preempt by doing the following in an
3051          * uninterrupted series of actions. (See below..)
3052          */
3053         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3054                 /*
3055                  * No existing or SA Reservation Key matching reservations..
3056                  *
3057                  * PROUT SA PREEMPT with All Registrant type reservations are
3058                  * allowed to be processed without a matching SA Reservation Key
3059                  */
3060                 spin_lock(&pr_tmpl->registration_lock);
3061                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3062                                 &pr_tmpl->registration_list, pr_reg_list) {
3063                         /*
3064                          * Removing of registrations in non all registrants
3065                          * type reservations without a matching SA reservation
3066                          * key.
3067                          *
3068                          * a) Remove the registrations for all I_T nexuses
3069                          *    specified by the SERVICE ACTION RESERVATION KEY
3070                          *    field;
3071                          * b) Ignore the contents of the SCOPE and TYPE fields;
3072                          * c) Process tasks as defined in 5.7.1; and
3073                          * d) Establish a unit attention condition for the
3074                          *    initiator port associated with every I_T nexus
3075                          *    that lost its registration other than the I_T
3076                          *    nexus on which the PERSISTENT RESERVE OUT command
3077                          *    was received, with the additional sense code set
3078                          *    to REGISTRATIONS PREEMPTED.
3079                          */
3080                         if (!all_reg) {
3081                                 if (pr_reg->pr_res_key != sa_res_key)
3082                                         continue;
3083
3084                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3085                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3086                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3087                                 __core_scsi3_free_registration(dev, pr_reg,
3088                                         (abort) ? &preempt_and_abort_list :
3089                                                 NULL, calling_it_nexus);
3090                                 released_regs++;
3091                         } else {
3092                                 /*
3093                                  * Case for any existing all registrants type
3094                                  * reservation, follow logic in spc4r17 section
3095                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3096                                  *
3097                                  * For a ZERO SA Reservation key, release
3098                                  * all other registrations and do an implict
3099                                  * release of active persistent reservation.
3100                                  *
3101                                  * For a non-ZERO SA Reservation key, only
3102                                  * release the matching reservation key from
3103                                  * registrations.
3104                                  */
3105                                 if ((sa_res_key) &&
3106                                      (pr_reg->pr_res_key != sa_res_key))
3107                                         continue;
3108
3109                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3110                                 if (calling_it_nexus)
3111                                         continue;
3112
3113                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3114                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3115                                 __core_scsi3_free_registration(dev, pr_reg,
3116                                         (abort) ? &preempt_and_abort_list :
3117                                                 NULL, 0);
3118                                 released_regs++;
3119                         }
3120                         if (!calling_it_nexus)
3121                                 core_scsi3_ua_allocate(pr_reg_nacl,
3122                                         pr_res_mapped_lun, 0x2A,
3123                                         ASCQ_2AH_RESERVATIONS_PREEMPTED);
3124                 }
3125                 spin_unlock(&pr_tmpl->registration_lock);
3126                 /*
3127                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3128                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3129                  * RESERVATION KEY field to a value that does not match any
3130                  * registered reservation key, then the device server shall
3131                  * complete the command with RESERVATION CONFLICT status.
3132                  */
3133                 if (!released_regs) {
3134                         spin_unlock(&dev->dev_reservation_lock);
3135                         core_scsi3_put_pr_reg(pr_reg_n);
3136                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3137                         return -EINVAL;
3138                 }
3139                 /*
3140                  * For an existing all registrants type reservation
3141                  * with a zero SA rservation key, preempt the existing
3142                  * reservation with the new PR type and scope.
3143                  */
3144                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3145                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3146                                 (abort) ? &preempt_and_abort_list : NULL,
3147                                 type, scope, abort);
3148
3149                         if (abort)
3150                                 core_scsi3_release_preempt_and_abort(
3151                                         &preempt_and_abort_list, pr_reg_n);
3152                 }
3153                 spin_unlock(&dev->dev_reservation_lock);
3154
3155                 if (pr_tmpl->pr_aptpl_active) {
3156                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3157                                         &pr_reg_n->pr_aptpl_buf[0],
3158                                         pr_tmpl->pr_aptpl_buf_len);
3159                         if (!ret)
3160                                 pr_debug("SPC-3 PR: Updated APTPL"
3161                                         " metadata for  PREEMPT%s\n", (abort) ?
3162                                         "_AND_ABORT" : "");
3163                 }
3164
3165                 core_scsi3_put_pr_reg(pr_reg_n);
3166                 core_scsi3_pr_generation(cmd->se_dev);
3167                 return 0;
3168         }
3169         /*
3170          * The PREEMPTing SA reservation key matches that of the
3171          * existing persistent reservation, first, we check if
3172          * we are preempting our own reservation.
3173          * From spc4r17, section 5.7.11.4.3 Preempting
3174          * persistent reservations and registration handling
3175          *
3176          * If an all registrants persistent reservation is not
3177          * present, it is not an error for the persistent
3178          * reservation holder to preempt itself (i.e., a
3179          * PERSISTENT RESERVE OUT with a PREEMPT service action
3180          * or a PREEMPT AND ABORT service action with the
3181          * SERVICE ACTION RESERVATION KEY value equal to the
3182          * persistent reservation holder's reservation key that
3183          * is received from the persistent reservation holder).
3184          * In that case, the device server shall establish the
3185          * new persistent reservation and maintain the
3186          * registration.
3187          */
3188         prh_type = pr_res_holder->pr_res_type;
3189         prh_scope = pr_res_holder->pr_res_scope;
3190         /*
3191          * If the SERVICE ACTION RESERVATION KEY field identifies a
3192          * persistent reservation holder (see 5.7.10), the device
3193          * server shall perform a preempt by doing the following as
3194          * an uninterrupted series of actions:
3195          *
3196          * a) Release the persistent reservation for the holder
3197          *    identified by the SERVICE ACTION RESERVATION KEY field;
3198          */
3199         if (pr_reg_n != pr_res_holder)
3200                 __core_scsi3_complete_pro_release(dev,
3201                                 pr_res_holder->pr_reg_nacl,
3202                                 dev->dev_pr_res_holder, 0);
3203         /*
3204          * b) Remove the registrations for all I_T nexuses identified
3205          *    by the SERVICE ACTION RESERVATION KEY field, except the
3206          *    I_T nexus that is being used for the PERSISTENT RESERVE
3207          *    OUT command. If an all registrants persistent reservation
3208          *    is present and the SERVICE ACTION RESERVATION KEY field
3209          *    is set to zero, then all registrations shall be removed
3210          *    except for that of the I_T nexus that is being used for
3211          *    the PERSISTENT RESERVE OUT command;
3212          */
3213         spin_lock(&pr_tmpl->registration_lock);
3214         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3215                         &pr_tmpl->registration_list, pr_reg_list) {
3216
3217                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3218                 if (calling_it_nexus)
3219                         continue;
3220
3221                 if (pr_reg->pr_res_key != sa_res_key)
3222                         continue;
3223
3224                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3225                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3226                 __core_scsi3_free_registration(dev, pr_reg,
3227                                 (abort) ? &preempt_and_abort_list : NULL,
3228                                 calling_it_nexus);
3229                 /*
3230                  * e) Establish a unit attention condition for the initiator
3231                  *    port associated with every I_T nexus that lost its
3232                  *    persistent reservation and/or registration, with the
3233                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3234                  */
3235                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3236                                 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3237         }
3238         spin_unlock(&pr_tmpl->registration_lock);
3239         /*
3240          * c) Establish a persistent reservation for the preempting
3241          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3242          */
3243         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3244                         (abort) ? &preempt_and_abort_list : NULL,
3245                         type, scope, abort);
3246         /*
3247          * d) Process tasks as defined in 5.7.1;
3248          * e) See above..
3249          * f) If the type or scope has changed, then for every I_T nexus
3250          *    whose reservation key was not removed, except for the I_T
3251          *    nexus on which the PERSISTENT RESERVE OUT command was
3252          *    received, the device server shall establish a unit
3253          *    attention condition for the initiator port associated with
3254          *    that I_T nexus, with the additional sense code set to
3255          *    RESERVATIONS RELEASED. If the type or scope have not
3256          *    changed, then no unit attention condition(s) shall be
3257          *    established for this reason.
3258          */
3259         if ((prh_type != type) || (prh_scope != scope)) {
3260                 spin_lock(&pr_tmpl->registration_lock);
3261                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3262                                 &pr_tmpl->registration_list, pr_reg_list) {
3263
3264                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3265                         if (calling_it_nexus)
3266                                 continue;
3267
3268                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3269                                         pr_reg->pr_res_mapped_lun, 0x2A,
3270                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3271                 }
3272                 spin_unlock(&pr_tmpl->registration_lock);
3273         }
3274         spin_unlock(&dev->dev_reservation_lock);
3275         /*
3276          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3277          * All received CDBs for the matching existing reservation and
3278          * registrations undergo ABORT_TASK logic.
3279          *
3280          * From there, core_scsi3_release_preempt_and_abort() will
3281          * release every registration in the list (which have already
3282          * been removed from the primary pr_reg list), except the
3283          * new persistent reservation holder, the calling Initiator Port.
3284          */
3285         if (abort) {
3286                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3287                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3288                                                 pr_reg_n);
3289         }
3290
3291         if (pr_tmpl->pr_aptpl_active) {
3292                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3293                                 &pr_reg_n->pr_aptpl_buf[0],
3294                                 pr_tmpl->pr_aptpl_buf_len);
3295                 if (!ret)
3296                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3297                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3298         }
3299
3300         core_scsi3_put_pr_reg(pr_reg_n);
3301         core_scsi3_pr_generation(cmd->se_dev);
3302         return 0;
3303 }
3304
3305 static int core_scsi3_emulate_pro_preempt(
3306         struct se_cmd *cmd,
3307         int type,
3308         int scope,
3309         u64 res_key,
3310         u64 sa_res_key,
3311         int abort)
3312 {
3313         int ret = 0;
3314
3315         switch (type) {
3316         case PR_TYPE_WRITE_EXCLUSIVE:
3317         case PR_TYPE_EXCLUSIVE_ACCESS:
3318         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3319         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3320         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3321         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3322                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3323                                 res_key, sa_res_key, abort);
3324                 break;
3325         default:
3326                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3327                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3328                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3329                 return -EINVAL;
3330         }
3331
3332         return ret;
3333 }
3334
3335
3336 static int core_scsi3_emulate_pro_register_and_move(
3337         struct se_cmd *cmd,
3338         u64 res_key,
3339         u64 sa_res_key,
3340         int aptpl,
3341         int unreg)
3342 {
3343         struct se_session *se_sess = cmd->se_sess;
3344         struct se_device *dev = cmd->se_dev;
3345         struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3346         struct se_lun *se_lun = cmd->se_lun;
3347         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3348         struct se_port *se_port;
3349         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3350         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3351         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3352         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3353         unsigned char *buf;
3354         unsigned char *initiator_str;
3355         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3356         u32 tid_len, tmp_tid_len;
3357         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3358         unsigned short rtpi;
3359         unsigned char proto_ident;
3360
3361         if (!se_sess || !se_lun) {
3362                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3363                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3364                 return -EINVAL;
3365         }
3366         memset(dest_iport, 0, 64);
3367         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3368         se_tpg = se_sess->se_tpg;
3369         tf_ops = se_tpg->se_tpg_tfo;
3370         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3371         /*
3372          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3373          *      Register behaviors for a REGISTER AND MOVE service action
3374          *
3375          * Locate the existing *pr_reg via struct se_node_acl pointers
3376          */
3377         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3378                                 se_sess);
3379         if (!pr_reg) {
3380                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3381                         " *pr_reg for REGISTER_AND_MOVE\n");
3382                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3383                 return -EINVAL;
3384         }
3385         /*
3386          * The provided reservation key much match the existing reservation key
3387          * provided during this initiator's I_T nexus registration.
3388          */
3389         if (res_key != pr_reg->pr_res_key) {
3390                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3391                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3392                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3393                 core_scsi3_put_pr_reg(pr_reg);
3394                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3395                 return -EINVAL;
3396         }
3397         /*
3398          * The service active reservation key needs to be non zero
3399          */
3400         if (!sa_res_key) {
3401                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3402                         " sa_res_key\n");
3403                 core_scsi3_put_pr_reg(pr_reg);
3404                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3405                 return -EINVAL;
3406         }
3407
3408         /*
3409          * Determine the Relative Target Port Identifier where the reservation
3410          * will be moved to for the TransportID containing SCSI initiator WWN
3411          * information.
3412          */
3413         buf = transport_kmap_first_data_page(cmd);
3414         rtpi = (buf[18] & 0xff) << 8;
3415         rtpi |= buf[19] & 0xff;
3416         tid_len = (buf[20] & 0xff) << 24;
3417         tid_len |= (buf[21] & 0xff) << 16;
3418         tid_len |= (buf[22] & 0xff) << 8;
3419         tid_len |= buf[23] & 0xff;
3420         transport_kunmap_first_data_page(cmd);
3421         buf = NULL;
3422
3423         if ((tid_len + 24) != cmd->data_length) {
3424                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3425                         " does not equal CDB data_length: %u\n", tid_len,
3426                         cmd->data_length);
3427                 core_scsi3_put_pr_reg(pr_reg);
3428                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3429                 return -EINVAL;
3430         }
3431
3432         spin_lock(&dev->se_port_lock);
3433         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3434                 if (se_port->sep_rtpi != rtpi)
3435                         continue;
3436                 dest_se_tpg = se_port->sep_tpg;
3437                 if (!dest_se_tpg)
3438                         continue;
3439                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3440                 if (!dest_tf_ops)
3441                         continue;
3442
3443                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3444                 smp_mb__after_atomic_inc();
3445                 spin_unlock(&dev->se_port_lock);
3446
3447                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3448                 if (ret != 0) {
3449                         pr_err("core_scsi3_tpg_depend_item() failed"
3450                                 " for dest_se_tpg\n");
3451                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3452                         smp_mb__after_atomic_dec();
3453                         core_scsi3_put_pr_reg(pr_reg);
3454                         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3455                         return -EINVAL;
3456                 }
3457
3458                 spin_lock(&dev->se_port_lock);
3459                 break;
3460         }
3461         spin_unlock(&dev->se_port_lock);
3462
3463         if (!dest_se_tpg || !dest_tf_ops) {
3464                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3465                         " fabric ops from Relative Target Port Identifier:"
3466                         " %hu\n", rtpi);
3467                 core_scsi3_put_pr_reg(pr_reg);
3468                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3469                 return -EINVAL;
3470         }
3471
3472         buf = transport_kmap_first_data_page(cmd);
3473         proto_ident = (buf[24] & 0x0f);
3474 #if 0
3475         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3476                         " 0x%02x\n", proto_ident);
3477 #endif
3478         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3479                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3480                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3481                         " from fabric: %s\n", proto_ident,
3482                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3483                         dest_tf_ops->get_fabric_name());
3484                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3485                 ret = -EINVAL;
3486                 goto out;
3487         }
3488         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3489                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3490                         " containg a valid tpg_parse_pr_out_transport_id"
3491                         " function pointer\n");
3492                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3493                 ret = -EINVAL;
3494                 goto out;
3495         }
3496         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3497                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3498         if (!initiator_str) {
3499                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3500                         " initiator_str from Transport ID\n");
3501                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3502                 ret = -EINVAL;
3503                 goto out;
3504         }
3505
3506         transport_kunmap_first_data_page(cmd);
3507         buf = NULL;
3508
3509         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3510                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3511                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3512                 iport_ptr : "");
3513         /*
3514          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3515          * action specifies a TransportID that is the same as the initiator port
3516          * of the I_T nexus for the command received, then the command shall
3517          * be terminated with CHECK CONDITION status, with the sense key set to
3518          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3519          * IN PARAMETER LIST.
3520          */
3521         pr_reg_nacl = pr_reg->pr_reg_nacl;
3522         matching_iname = (!strcmp(initiator_str,
3523                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3524         if (!matching_iname)
3525                 goto after_iport_check;
3526
3527         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3528                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3529                         " matches: %s on received I_T Nexus\n", initiator_str,
3530                         pr_reg_nacl->initiatorname);
3531                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3532                 ret = -EINVAL;
3533                 goto out;
3534         }
3535         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3536                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3537                         " matches: %s %s on received I_T Nexus\n",
3538                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3539                         pr_reg->pr_reg_isid);
3540                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3541                 ret = -EINVAL;
3542                 goto out;
3543         }
3544 after_iport_check:
3545         /*
3546          * Locate the destination struct se_node_acl from the received Transport ID
3547          */
3548         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3549         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3550                                 initiator_str);
3551         if (dest_node_acl) {
3552                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3553                 smp_mb__after_atomic_inc();
3554         }
3555         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3556
3557         if (!dest_node_acl) {
3558                 pr_err("Unable to locate %s dest_node_acl for"
3559                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3560                         initiator_str);
3561                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3562                 ret = -EINVAL;
3563                 goto out;
3564         }
3565         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3566         if (ret != 0) {
3567                 pr_err("core_scsi3_nodeacl_depend_item() for"
3568                         " dest_node_acl\n");
3569                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3570                 smp_mb__after_atomic_dec();
3571                 dest_node_acl = NULL;
3572                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3573                 ret = -EINVAL;
3574                 goto out;
3575         }
3576 #if 0
3577         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3578                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3579                 dest_node_acl->initiatorname);
3580 #endif
3581         /*
3582          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3583          * PORT IDENTIFIER.
3584          */
3585         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3586         if (!dest_se_deve) {
3587                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3588                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3589                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3590                 ret = -EINVAL;
3591                 goto out;
3592         }
3593
3594         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3595         if (ret < 0) {
3596                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3597                 atomic_dec(&dest_se_deve->pr_ref_count);
3598                 smp_mb__after_atomic_dec();
3599                 dest_se_deve = NULL;
3600                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3601                 ret = -EINVAL;
3602                 goto out;
3603         }
3604 #if 0
3605         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3606                 " ACL for dest_se_deve->mapped_lun: %u\n",
3607                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3608                 dest_se_deve->mapped_lun);
3609 #endif
3610         /*
3611          * A persistent reservation needs to already existing in order to
3612          * successfully complete the REGISTER_AND_MOVE service action..
3613          */
3614         spin_lock(&dev->dev_reservation_lock);
3615         pr_res_holder = dev->dev_pr_res_holder;
3616         if (!pr_res_holder) {
3617                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3618                         " currently held\n");
3619                 spin_unlock(&dev->dev_reservation_lock);
3620                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3621                 ret = -EINVAL;
3622                 goto out;
3623         }
3624         /*
3625          * The received on I_T Nexus must be the reservation holder.
3626          *
3627          * From spc4r17 section 5.7.8  Table 50 --
3628          *      Register behaviors for a REGISTER AND MOVE service action
3629          */
3630         if (pr_res_holder != pr_reg) {
3631                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3632                         " Nexus is not reservation holder\n");
3633                 spin_unlock(&dev->dev_reservation_lock);
3634                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3635                 ret = -EINVAL;
3636                 goto out;
3637         }
3638         /*
3639          * From spc4r17 section 5.7.8: registering and moving reservation
3640          *
3641          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3642          * action is received and the established persistent reservation is a
3643          * Write Exclusive - All Registrants type or Exclusive Access -
3644          * All Registrants type reservation, then the command shall be completed
3645          * with RESERVATION CONFLICT status.
3646          */
3647         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3648             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3649                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3650                         " reservation for type: %s\n",
3651                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3652                 spin_unlock(&dev->dev_reservation_lock);
3653                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3654                 ret = -EINVAL;
3655                 goto out;
3656         }
3657         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3658         /*
3659          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3660          */
3661         type = pr_res_holder->pr_res_type;
3662         scope = pr_res_holder->pr_res_type;
3663         /*
3664          * c) Associate the reservation key specified in the SERVICE ACTION
3665          *    RESERVATION KEY field with the I_T nexus specified as the
3666          *    destination of the register and move, where:
3667          *    A) The I_T nexus is specified by the TransportID and the
3668          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3669          *    B) Regardless of the TransportID format used, the association for
3670          *       the initiator port is based on either the initiator port name
3671          *       (see 3.1.71) on SCSI transport protocols where port names are
3672          *       required or the initiator port identifier (see 3.1.70) on SCSI
3673          *       transport protocols where port names are not required;
3674          * d) Register the reservation key specified in the SERVICE ACTION
3675          *    RESERVATION KEY field;
3676          * e) Retain the reservation key specified in the SERVICE ACTION
3677          *    RESERVATION KEY field and associated information;
3678          *
3679          * Also, It is not an error for a REGISTER AND MOVE service action to
3680          * register an I_T nexus that is already registered with the same
3681          * reservation key or a different reservation key.
3682          */
3683         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3684                                         iport_ptr);
3685         if (!dest_pr_reg) {
3686                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3687                                 dest_node_acl, dest_se_deve, iport_ptr,
3688                                 sa_res_key, 0, aptpl, 2, 1);
3689                 if (ret != 0) {
3690                         spin_unlock(&dev->dev_reservation_lock);
3691                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3692                         ret = -EINVAL;
3693                         goto out;
3694                 }
3695                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3696                                                 iport_ptr);
3697                 new_reg = 1;
3698         }
3699         /*
3700          * f) Release the persistent reservation for the persistent reservation
3701          *    holder (i.e., the I_T nexus on which the
3702          */
3703         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3704                         dev->dev_pr_res_holder, 0);
3705         /*
3706          * g) Move the persistent reservation to the specified I_T nexus using
3707          *    the same scope and type as the persistent reservation released in
3708          *    item f); and
3709          */
3710         dev->dev_pr_res_holder = dest_pr_reg;
3711         dest_pr_reg->pr_res_holder = 1;
3712         dest_pr_reg->pr_res_type = type;
3713         pr_reg->pr_res_scope = scope;
3714         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3715                                 PR_REG_ISID_ID_LEN);
3716         /*
3717          * Increment PRGeneration for existing registrations..
3718          */
3719         if (!new_reg)
3720                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3721         spin_unlock(&dev->dev_reservation_lock);
3722
3723         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3724                 " created new reservation holder TYPE: %s on object RTPI:"
3725                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3726                 core_scsi3_pr_dump_type(type), rtpi,
3727                 dest_pr_reg->pr_res_generation);
3728         pr_debug("SPC-3 PR Successfully moved reservation from"
3729                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3730                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3731                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3732                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3733                 iport_ptr : "");
3734         /*
3735          * It is now safe to release configfs group dependencies for destination
3736          * of Transport ID Initiator Device/Port Identifier
3737          */
3738         core_scsi3_lunacl_undepend_item(dest_se_deve);
3739         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3740         core_scsi3_tpg_undepend_item(dest_se_tpg);
3741         /*
3742          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3743          * nexus on which PERSISTENT RESERVE OUT command was received.
3744          */
3745         if (unreg) {
3746                 spin_lock(&pr_tmpl->registration_lock);
3747                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3748                 spin_unlock(&pr_tmpl->registration_lock);
3749         } else
3750                 core_scsi3_put_pr_reg(pr_reg);
3751
3752         /*
3753          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3754          * write out the updated metadata to struct file for this SCSI device.
3755          */
3756         if (!aptpl) {
3757                 pr_tmpl->pr_aptpl_active = 0;
3758                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3759                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3760                                 " REGISTER_AND_MOVE\n");
3761         } else {
3762                 pr_tmpl->pr_aptpl_active = 1;
3763                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3764                                 &dest_pr_reg->pr_aptpl_buf[0],
3765                                 pr_tmpl->pr_aptpl_buf_len);
3766                 if (!ret)
3767                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3768                                         " REGISTER_AND_MOVE\n");
3769         }
3770
3771         transport_kunmap_first_data_page(cmd);
3772
3773         core_scsi3_put_pr_reg(dest_pr_reg);
3774         return 0;
3775 out:
3776         if (buf)
3777                 transport_kunmap_first_data_page(cmd);
3778         if (dest_se_deve)
3779                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3780         if (dest_node_acl)
3781                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3782         core_scsi3_tpg_undepend_item(dest_se_tpg);
3783         core_scsi3_put_pr_reg(pr_reg);
3784         return ret;
3785 }
3786
3787 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3788 {
3789         unsigned int __v1, __v2;
3790
3791         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3792         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3793
3794         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3795 }
3796
3797 /*
3798  * See spc4r17 section 6.14 Table 170
3799  */
3800 int target_scsi3_emulate_pr_out(struct se_task *task)
3801 {
3802         struct se_cmd *cmd = task->task_se_cmd;
3803         unsigned char *cdb = &cmd->t_task_cdb[0];
3804         unsigned char *buf;
3805         u64 res_key, sa_res_key;
3806         int sa, scope, type, aptpl;
3807         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3808         int ret;
3809
3810         /*
3811          * Following spc2r20 5.5.1 Reservations overview:
3812          *
3813          * If a logical unit has been reserved by any RESERVE command and is
3814          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3815          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3816          * initiator or service action and shall terminate with a RESERVATION
3817          * CONFLICT status.
3818          */
3819         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
3820                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3821                         " SPC-2 reservation is held, returning"
3822                         " RESERVATION_CONFLICT\n");
3823                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3824                 ret = EINVAL;
3825                 goto out;
3826         }
3827
3828         /*
3829          * FIXME: A NULL struct se_session pointer means an this is not coming from
3830          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3831          */
3832         if (!cmd->se_sess) {
3833                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3834                 return -EINVAL;
3835         }
3836
3837         if (cmd->data_length < 24) {
3838                 pr_warn("SPC-PR: Received PR OUT parameter list"
3839                         " length too small: %u\n", cmd->data_length);
3840                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3841                 ret = -EINVAL;
3842                 goto out;
3843         }
3844         /*
3845          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3846          */
3847         sa = (cdb[1] & 0x1f);
3848         scope = (cdb[2] & 0xf0);
3849         type = (cdb[2] & 0x0f);
3850
3851         buf = transport_kmap_first_data_page(cmd);
3852         /*
3853          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3854          */
3855         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3856         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3857         /*
3858          * REGISTER_AND_MOVE uses a different SA parameter list containing
3859          * SCSI TransportIDs.
3860          */
3861         if (sa != PRO_REGISTER_AND_MOVE) {
3862                 spec_i_pt = (buf[20] & 0x08);
3863                 all_tg_pt = (buf[20] & 0x04);
3864                 aptpl = (buf[20] & 0x01);
3865         } else {
3866                 aptpl = (buf[17] & 0x01);
3867                 unreg = (buf[17] & 0x02);
3868         }
3869         transport_kunmap_first_data_page(cmd);
3870         buf = NULL;
3871
3872         /*
3873          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3874          */
3875         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
3876                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3877                 ret = -EINVAL;
3878                 goto out;
3879         }
3880
3881         /*
3882          * From spc4r17 section 6.14:
3883          *
3884          * If the SPEC_I_PT bit is set to zero, the service action is not
3885          * REGISTER AND MOVE, and the parameter list length is not 24, then
3886          * the command shall be terminated with CHECK CONDITION status, with
3887          * the sense key set to ILLEGAL REQUEST, and the additional sense
3888          * code set to PARAMETER LIST LENGTH ERROR.
3889          */
3890         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3891             (cmd->data_length != 24)) {
3892                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3893                         " list length: %u\n", cmd->data_length);
3894                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3895                 ret = -EINVAL;
3896                 goto out;
3897         }
3898         /*
3899          * (core_scsi3_emulate_pro_* function parameters
3900          * are defined by spc4r17 Table 174:
3901          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3902          */
3903         switch (sa) {
3904         case PRO_REGISTER:
3905                 ret = core_scsi3_emulate_pro_register(cmd,
3906                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3907                 break;
3908         case PRO_RESERVE:
3909                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3910                 break;
3911         case PRO_RELEASE:
3912                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3913                 break;
3914         case PRO_CLEAR:
3915                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3916                 break;
3917         case PRO_PREEMPT:
3918                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3919                                         res_key, sa_res_key, 0);
3920                 break;
3921         case PRO_PREEMPT_AND_ABORT:
3922                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3923                                         res_key, sa_res_key, 1);
3924                 break;
3925         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3926                 ret = core_scsi3_emulate_pro_register(cmd,
3927                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3928                 break;
3929         case PRO_REGISTER_AND_MOVE:
3930                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3931                                 sa_res_key, aptpl, unreg);
3932                 break;
3933         default:
3934                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3935                         " action: 0x%02x\n", cdb[1] & 0x1f);
3936                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3937                 ret = -EINVAL;
3938                 break;
3939         }
3940
3941 out:
3942         if (!ret) {
3943                 task->task_scsi_status = GOOD;
3944                 transport_complete_task(task, 1);
3945         }
3946         return ret;
3947 }
3948
3949 /*
3950  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3951  *
3952  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3953  */
3954 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3955 {
3956         struct se_device *se_dev = cmd->se_dev;
3957         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3958         struct t10_pr_registration *pr_reg;
3959         unsigned char *buf;
3960         u32 add_len = 0, off = 8;
3961
3962         if (cmd->data_length < 8) {
3963                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3964                         " too small\n", cmd->data_length);
3965                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3966                 return -EINVAL;
3967         }
3968
3969         buf = transport_kmap_first_data_page(cmd);
3970         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3971         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3972         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3973         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3974
3975         spin_lock(&su_dev->t10_pr.registration_lock);
3976         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3977                         pr_reg_list) {
3978                 /*
3979                  * Check for overflow of 8byte PRI READ_KEYS payload and
3980                  * next reservation key list descriptor.
3981                  */
3982                 if ((add_len + 8) > (cmd->data_length - 8))
3983                         break;
3984
3985                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3986                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3987                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3988                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3989                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3990                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3991                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3992                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3993
3994                 add_len += 8;
3995         }
3996         spin_unlock(&su_dev->t10_pr.registration_lock);
3997
3998         buf[4] = ((add_len >> 24) & 0xff);
3999         buf[5] = ((add_len >> 16) & 0xff);
4000         buf[6] = ((add_len >> 8) & 0xff);
4001         buf[7] = (add_len & 0xff);
4002
4003         transport_kunmap_first_data_page(cmd);
4004
4005         return 0;
4006 }
4007
4008 /*
4009  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
4010  *
4011  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
4012  */
4013 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
4014 {
4015         struct se_device *se_dev = cmd->se_dev;
4016         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4017         struct t10_pr_registration *pr_reg;
4018         unsigned char *buf;
4019         u64 pr_res_key;
4020         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
4021
4022         if (cmd->data_length < 8) {
4023                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
4024                         " too small\n", cmd->data_length);
4025                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4026                 return -EINVAL;
4027         }
4028
4029         buf = transport_kmap_first_data_page(cmd);
4030         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4031         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4032         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4033         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4034
4035         spin_lock(&se_dev->dev_reservation_lock);
4036         pr_reg = se_dev->dev_pr_res_holder;
4037         if ((pr_reg)) {
4038                 /*
4039                  * Set the hardcoded Additional Length
4040                  */
4041                 buf[4] = ((add_len >> 24) & 0xff);
4042                 buf[5] = ((add_len >> 16) & 0xff);
4043                 buf[6] = ((add_len >> 8) & 0xff);
4044                 buf[7] = (add_len & 0xff);
4045
4046                 if (cmd->data_length < 22)
4047                         goto err;
4048
4049                 /*
4050                  * Set the Reservation key.
4051                  *
4052                  * From spc4r17, section 5.7.10:
4053                  * A persistent reservation holder has its reservation key
4054                  * returned in the parameter data from a PERSISTENT
4055                  * RESERVE IN command with READ RESERVATION service action as
4056                  * follows:
4057                  * a) For a persistent reservation of the type Write Exclusive
4058                  *    - All Registrants or Exclusive Access  All Regitrants,
4059                  *      the reservation key shall be set to zero; or
4060                  * b) For all other persistent reservation types, the
4061                  *    reservation key shall be set to the registered
4062                  *    reservation key for the I_T nexus that holds the
4063                  *    persistent reservation.
4064                  */
4065                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
4066                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
4067                         pr_res_key = 0;
4068                 else
4069                         pr_res_key = pr_reg->pr_res_key;
4070
4071                 buf[8] = ((pr_res_key >> 56) & 0xff);
4072                 buf[9] = ((pr_res_key >> 48) & 0xff);
4073                 buf[10] = ((pr_res_key >> 40) & 0xff);
4074                 buf[11] = ((pr_res_key >> 32) & 0xff);
4075                 buf[12] = ((pr_res_key >> 24) & 0xff);
4076                 buf[13] = ((pr_res_key >> 16) & 0xff);
4077                 buf[14] = ((pr_res_key >> 8) & 0xff);
4078                 buf[15] = (pr_res_key & 0xff);
4079                 /*
4080                  * Set the SCOPE and TYPE
4081                  */
4082                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
4083                           (pr_reg->pr_res_type & 0x0f);
4084         }
4085
4086 err:
4087         spin_unlock(&se_dev->dev_reservation_lock);
4088         transport_kunmap_first_data_page(cmd);
4089
4090         return 0;
4091 }
4092
4093 /*
4094  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
4095  *
4096  * See spc4r17 section 6.13.4 Table 165
4097  */
4098 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
4099 {
4100         struct se_device *dev = cmd->se_dev;
4101         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
4102         unsigned char *buf;
4103         u16 add_len = 8; /* Hardcoded to 8. */
4104
4105         if (cmd->data_length < 6) {
4106                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4107                         " %u too small\n", cmd->data_length);
4108                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4109                 return -EINVAL;
4110         }
4111
4112         buf = transport_kmap_first_data_page(cmd);
4113
4114         buf[0] = ((add_len << 8) & 0xff);
4115         buf[1] = (add_len & 0xff);
4116         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4117         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4118         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4119         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4120         /*
4121          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4122          * set the TMV: Task Mask Valid bit.
4123          */
4124         buf[3] |= 0x80;
4125         /*
4126          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4127          */
4128         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4129         /*
4130          * PTPL_A: Persistence across Target Power Loss Active bit
4131          */
4132         if (pr_tmpl->pr_aptpl_active)
4133                 buf[3] |= 0x01;
4134         /*
4135          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4136          */
4137         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4138         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4139         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4140         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4141         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4142         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4143
4144         transport_kunmap_first_data_page(cmd);
4145
4146         return 0;
4147 }
4148
4149 /*
4150  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4151  *
4152  * See spc4r17 section 6.13.5 Table 168 and 169
4153  */
4154 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4155 {
4156         struct se_device *se_dev = cmd->se_dev;
4157         struct se_node_acl *se_nacl;
4158         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4159         struct se_portal_group *se_tpg;
4160         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4161         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4162         unsigned char *buf;
4163         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4164         u32 off = 8; /* off into first Full Status descriptor */
4165         int format_code = 0;
4166
4167         if (cmd->data_length < 8) {
4168                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4169                         " too small\n", cmd->data_length);
4170                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4171                 return -EINVAL;
4172         }
4173
4174         buf = transport_kmap_first_data_page(cmd);
4175
4176         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4177         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4178         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4179         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4180
4181         spin_lock(&pr_tmpl->registration_lock);
4182         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4183                         &pr_tmpl->registration_list, pr_reg_list) {
4184
4185                 se_nacl = pr_reg->pr_reg_nacl;
4186                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4187                 add_desc_len = 0;
4188
4189                 atomic_inc(&pr_reg->pr_res_holders);
4190                 smp_mb__after_atomic_inc();
4191                 spin_unlock(&pr_tmpl->registration_lock);
4192                 /*
4193                  * Determine expected length of $FABRIC_MOD specific
4194                  * TransportID full status descriptor..
4195                  */
4196                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4197                                 se_tpg, se_nacl, pr_reg, &format_code);
4198
4199                 if ((exp_desc_len + add_len) > cmd->data_length) {
4200                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4201                                 " out of buffer: %d\n", cmd->data_length);
4202                         spin_lock(&pr_tmpl->registration_lock);
4203                         atomic_dec(&pr_reg->pr_res_holders);
4204                         smp_mb__after_atomic_dec();
4205                         break;
4206                 }
4207                 /*
4208                  * Set RESERVATION KEY
4209                  */
4210                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4211                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4212                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4213                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4214                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4215                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4216                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4217                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4218                 off += 4; /* Skip Over Reserved area */
4219
4220                 /*
4221                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4222                  */
4223                 if (pr_reg->pr_reg_all_tg_pt)
4224                         buf[off] = 0x02;
4225                 /*
4226                  * The struct se_lun pointer will be present for the
4227                  * reservation holder for PR_HOLDER bit.
4228                  *
4229                  * Also, if this registration is the reservation
4230                  * holder, fill in SCOPE and TYPE in the next byte.
4231                  */
4232                 if (pr_reg->pr_res_holder) {
4233                         buf[off++] |= 0x01;
4234                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4235                                      (pr_reg->pr_res_type & 0x0f);
4236                 } else
4237                         off += 2;
4238
4239                 off += 4; /* Skip over reserved area */
4240                 /*
4241                  * From spc4r17 6.3.15:
4242                  *
4243                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4244                  * IDENTIFIER field contains the relative port identifier (see
4245                  * 3.1.120) of the target port that is part of the I_T nexus
4246                  * described by this full status descriptor. If the ALL_TG_PT
4247                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4248                  * IDENTIFIER field are not defined by this standard.
4249                  */
4250                 if (!pr_reg->pr_reg_all_tg_pt) {
4251                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4252
4253                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4254                         buf[off++] = (port->sep_rtpi & 0xff);
4255                 } else
4256                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4257
4258                 /*
4259                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4260                  */
4261                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4262                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4263
4264                 spin_lock(&pr_tmpl->registration_lock);
4265                 atomic_dec(&pr_reg->pr_res_holders);
4266                 smp_mb__after_atomic_dec();
4267                 /*
4268                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4269                  */
4270                 buf[off++] = ((desc_len >> 24) & 0xff);
4271                 buf[off++] = ((desc_len >> 16) & 0xff);
4272                 buf[off++] = ((desc_len >> 8) & 0xff);
4273                 buf[off++] = (desc_len & 0xff);
4274                 /*
4275                  * Size of full desctipor header minus TransportID
4276                  * containing $FABRIC_MOD specific) initiator device/port
4277                  * WWN information.
4278                  *
4279                  *  See spc4r17 Section 6.13.5 Table 169
4280                  */
4281                 add_desc_len = (24 + desc_len);
4282
4283                 off += desc_len;
4284                 add_len += add_desc_len;
4285         }
4286         spin_unlock(&pr_tmpl->registration_lock);
4287         /*
4288          * Set ADDITIONAL_LENGTH
4289          */
4290         buf[4] = ((add_len >> 24) & 0xff);
4291         buf[5] = ((add_len >> 16) & 0xff);
4292         buf[6] = ((add_len >> 8) & 0xff);
4293         buf[7] = (add_len & 0xff);
4294
4295         transport_kunmap_first_data_page(cmd);
4296
4297         return 0;
4298 }
4299
4300 int target_scsi3_emulate_pr_in(struct se_task *task)
4301 {
4302         struct se_cmd *cmd = task->task_se_cmd;
4303         int ret;
4304
4305         /*
4306          * Following spc2r20 5.5.1 Reservations overview:
4307          *
4308          * If a logical unit has been reserved by any RESERVE command and is
4309          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4310          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4311          * initiator or service action and shall terminate with a RESERVATION
4312          * CONFLICT status.
4313          */
4314         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
4315                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4316                         " SPC-2 reservation is held, returning"
4317                         " RESERVATION_CONFLICT\n");
4318                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
4319                 return -EINVAL;
4320         }
4321
4322         switch (cmd->t_task_cdb[1] & 0x1f) {
4323         case PRI_READ_KEYS:
4324                 ret = core_scsi3_pri_read_keys(cmd);
4325                 break;
4326         case PRI_READ_RESERVATION:
4327                 ret = core_scsi3_pri_read_reservation(cmd);
4328                 break;
4329         case PRI_REPORT_CAPABILITIES:
4330                 ret = core_scsi3_pri_report_capabilities(cmd);
4331                 break;
4332         case PRI_READ_FULL_STATUS:
4333                 ret = core_scsi3_pri_read_full_status(cmd);
4334                 break;
4335         default:
4336                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4337                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4338                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4339                 ret = -EINVAL;
4340                 break;
4341         }
4342
4343         if (!ret) {
4344                 task->task_scsi_status = GOOD;
4345                 transport_complete_task(task, 1);
4346         }
4347         return ret;
4348 }
4349
4350 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4351 {
4352         return 0;
4353 }
4354
4355 static int core_pt_seq_non_holder(
4356         struct se_cmd *cmd,
4357         unsigned char *cdb,
4358         u32 pr_reg_type)
4359 {
4360         return 0;
4361 }
4362
4363 int core_setup_reservations(struct se_device *dev, int force_pt)
4364 {
4365         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4366         struct t10_reservation *rest = &su_dev->t10_pr;
4367         /*
4368          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4369          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4370          * cause a problem because libata and some SATA RAID HBAs appear
4371          * under Linux/SCSI, but to emulate reservations themselves.
4372          */
4373         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4374             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4375                 rest->res_type = SPC_PASSTHROUGH;
4376                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4377                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4378                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4379                         " emulation\n", dev->transport->name);
4380                 return 0;
4381         }
4382         /*
4383          * If SPC-3 or above is reported by real or emulated struct se_device,
4384          * use emulated Persistent Reservations.
4385          */
4386         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4387                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4388                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4389                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4390                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4391                         " emulation\n", dev->transport->name);
4392         } else {
4393                 rest->res_type = SPC2_RESERVATIONS;
4394                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4395                 rest->pr_ops.t10_seq_non_holder =
4396                                 &core_scsi2_reservation_seq_non_holder;
4397                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4398                         dev->transport->name);
4399         }
4400
4401         return 0;
4402 }