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