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         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
1502         local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1503         /*
1504          * Allocate a struct pr_transport_id_holder and setup the
1505          * local_node_acl and local_se_deve pointers and add to
1506          * struct list_head tid_dest_list for add registration
1507          * processing in the loop of tid_dest_list below.
1508          */
1509         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1510         if (!tidh_new) {
1511                 pr_err("Unable to allocate tidh_new\n");
1512                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1513                 return -EINVAL;
1514         }
1515         INIT_LIST_HEAD(&tidh_new->dest_list);
1516         tidh_new->dest_tpg = tpg;
1517         tidh_new->dest_node_acl = se_sess->se_node_acl;
1518         tidh_new->dest_se_deve = local_se_deve;
1519
1520         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1521                                 se_sess->se_node_acl, local_se_deve, l_isid,
1522                                 sa_res_key, all_tg_pt, aptpl);
1523         if (!local_pr_reg) {
1524                 kfree(tidh_new);
1525                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1526                 return -ENOMEM;
1527         }
1528         tidh_new->dest_pr_reg = local_pr_reg;
1529         /*
1530          * The local I_T nexus does not hold any configfs dependances,
1531          * so we set tid_h->dest_local_nexus=1 to prevent the
1532          * configfs_undepend_item() calls in the tid_dest_list loops below.
1533          */
1534         tidh_new->dest_local_nexus = 1;
1535         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1536
1537         buf = transport_kmap_data_sg(cmd);
1538         /*
1539          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1540          * first extract TransportID Parameter Data Length, and make sure
1541          * the value matches up to the SCSI expected data transfer length.
1542          */
1543         tpdl = (buf[24] & 0xff) << 24;
1544         tpdl |= (buf[25] & 0xff) << 16;
1545         tpdl |= (buf[26] & 0xff) << 8;
1546         tpdl |= buf[27] & 0xff;
1547
1548         if ((tpdl + 28) != cmd->data_length) {
1549                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1550                         " does not equal CDB data_length: %u\n", tpdl,
1551                         cmd->data_length);
1552                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1553                 ret = -EINVAL;
1554                 goto out;
1555         }
1556         /*
1557          * Start processing the received transport IDs using the
1558          * receiving I_T Nexus portal's fabric dependent methods to
1559          * obtain the SCSI Initiator Port/Device Identifiers.
1560          */
1561         ptr = &buf[28];
1562
1563         while (tpdl > 0) {
1564                 proto_ident = (ptr[0] & 0x0f);
1565                 dest_tpg = NULL;
1566
1567                 spin_lock(&dev->se_port_lock);
1568                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1569                         tmp_tpg = tmp_port->sep_tpg;
1570                         if (!tmp_tpg)
1571                                 continue;
1572                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1573                         if (!tmp_tf_ops)
1574                                 continue;
1575                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1576                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1577                                 continue;
1578                         /*
1579                          * Look for the matching proto_ident provided by
1580                          * the received TransportID
1581                          */
1582                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1583                         if (tmp_proto_ident != proto_ident)
1584                                 continue;
1585                         dest_rtpi = tmp_port->sep_rtpi;
1586
1587                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1588                                         tmp_tpg, (const char *)ptr, &tid_len,
1589                                         &iport_ptr);
1590                         if (!i_str)
1591                                 continue;
1592
1593                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1594                         smp_mb__after_atomic_inc();
1595                         spin_unlock(&dev->se_port_lock);
1596
1597                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1598                         if (ret != 0) {
1599                                 pr_err(" core_scsi3_tpg_depend_item()"
1600                                         " for tmp_tpg\n");
1601                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1602                                 smp_mb__after_atomic_dec();
1603                                 cmd->scsi_sense_reason =
1604                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1605                                 ret = -EINVAL;
1606                                 goto out;
1607                         }
1608                         /*
1609                          * Locate the desination initiator ACL to be registered
1610                          * from the decoded fabric module specific TransportID
1611                          * at *i_str.
1612                          */
1613                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1614                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1615                                                 tmp_tpg, i_str);
1616                         if (dest_node_acl) {
1617                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1618                                 smp_mb__after_atomic_inc();
1619                         }
1620                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1621
1622                         if (!dest_node_acl) {
1623                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1624                                 spin_lock(&dev->se_port_lock);
1625                                 continue;
1626                         }
1627
1628                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1629                         if (ret != 0) {
1630                                 pr_err("configfs_depend_item() failed"
1631                                         " for dest_node_acl->acl_group\n");
1632                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1633                                 smp_mb__after_atomic_dec();
1634                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1635                                 cmd->scsi_sense_reason =
1636                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1637                                 ret = -EINVAL;
1638                                 goto out;
1639                         }
1640
1641                         dest_tpg = tmp_tpg;
1642                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1643                                 " %s Port RTPI: %hu\n",
1644                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1645                                 dest_node_acl->initiatorname, dest_rtpi);
1646
1647                         spin_lock(&dev->se_port_lock);
1648                         break;
1649                 }
1650                 spin_unlock(&dev->se_port_lock);
1651
1652                 if (!dest_tpg) {
1653                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1654                                         " dest_tpg\n");
1655                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1656                         ret = -EINVAL;
1657                         goto out;
1658                 }
1659 #if 0
1660                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1661                         " tid_len: %d for %s + %s\n",
1662                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1663                         tpdl, tid_len, i_str, iport_ptr);
1664 #endif
1665                 if (tid_len > tpdl) {
1666                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1667                                 " %u for Transport ID: %s\n", tid_len, ptr);
1668                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669                         core_scsi3_tpg_undepend_item(dest_tpg);
1670                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1671                         ret = -EINVAL;
1672                         goto out;
1673                 }
1674                 /*
1675                  * Locate the desintation struct se_dev_entry pointer for matching
1676                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1677                  * Target Port.
1678                  */
1679                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1680                                         dest_rtpi);
1681                 if (!dest_se_deve) {
1682                         pr_err("Unable to locate %s dest_se_deve"
1683                                 " from destination RTPI: %hu\n",
1684                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1685                                 dest_rtpi);
1686
1687                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1688                         core_scsi3_tpg_undepend_item(dest_tpg);
1689                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1690                         ret = -EINVAL;
1691                         goto out;
1692                 }
1693
1694                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1695                 if (ret < 0) {
1696                         pr_err("core_scsi3_lunacl_depend_item()"
1697                                         " failed\n");
1698                         atomic_dec(&dest_se_deve->pr_ref_count);
1699                         smp_mb__after_atomic_dec();
1700                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1701                         core_scsi3_tpg_undepend_item(dest_tpg);
1702                         cmd->scsi_sense_reason =
1703                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1704                         ret = -EINVAL;
1705                         goto out;
1706                 }
1707 #if 0
1708                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1709                         " dest_se_deve mapped_lun: %u\n",
1710                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1711                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1712 #endif
1713                 /*
1714                  * Skip any TransportIDs that already have a registration for
1715                  * this target port.
1716                  */
1717                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1718                                         iport_ptr);
1719                 if (pr_reg_e) {
1720                         core_scsi3_put_pr_reg(pr_reg_e);
1721                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1722                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1723                         core_scsi3_tpg_undepend_item(dest_tpg);
1724                         ptr += tid_len;
1725                         tpdl -= tid_len;
1726                         tid_len = 0;
1727                         continue;
1728                 }
1729                 /*
1730                  * Allocate a struct pr_transport_id_holder and setup
1731                  * the dest_node_acl and dest_se_deve pointers for the
1732                  * loop below.
1733                  */
1734                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1735                                 GFP_KERNEL);
1736                 if (!tidh_new) {
1737                         pr_err("Unable to allocate tidh_new\n");
1738                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1739                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1740                         core_scsi3_tpg_undepend_item(dest_tpg);
1741                         cmd->scsi_sense_reason =
1742                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1743                         ret = -ENOMEM;
1744                         goto out;
1745                 }
1746                 INIT_LIST_HEAD(&tidh_new->dest_list);
1747                 tidh_new->dest_tpg = dest_tpg;
1748                 tidh_new->dest_node_acl = dest_node_acl;
1749                 tidh_new->dest_se_deve = dest_se_deve;
1750
1751                 /*
1752                  * Allocate, but do NOT add the registration for the
1753                  * TransportID referenced SCSI Initiator port.  This
1754                  * done because of the following from spc4r17 in section
1755                  * 6.14.3 wrt SPEC_I_PT:
1756                  *
1757                  * "If a registration fails for any initiator port (e.g., if th
1758                  * logical unit does not have enough resources available to
1759                  * hold the registration information), no registrations shall be
1760                  * made, and the command shall be terminated with
1761                  * CHECK CONDITION status."
1762                  *
1763                  * That means we call __core_scsi3_alloc_registration() here,
1764                  * and then call __core_scsi3_add_registration() in the
1765                  * 2nd loop which will never fail.
1766                  */
1767                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1768                                 dest_node_acl, dest_se_deve, iport_ptr,
1769                                 sa_res_key, all_tg_pt, aptpl);
1770                 if (!dest_pr_reg) {
1771                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1772                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1773                         core_scsi3_tpg_undepend_item(dest_tpg);
1774                         kfree(tidh_new);
1775                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1776                         ret = -EINVAL;
1777                         goto out;
1778                 }
1779                 tidh_new->dest_pr_reg = dest_pr_reg;
1780                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1781
1782                 ptr += tid_len;
1783                 tpdl -= tid_len;
1784                 tid_len = 0;
1785
1786         }
1787
1788         transport_kunmap_data_sg(cmd);
1789
1790         /*
1791          * Go ahead and create a registrations from tid_dest_list for the
1792          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1793          * and dest_se_deve.
1794          *
1795          * The SA Reservation Key from the PROUT is set for the
1796          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1797          * means that the TransportID Initiator port will be
1798          * registered on all of the target ports in the SCSI target device
1799          * ALL_TG_PT=0 means the registration will only be for the
1800          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1801          * was received.
1802          */
1803         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1804                 dest_tpg = tidh->dest_tpg;
1805                 dest_node_acl = tidh->dest_node_acl;
1806                 dest_se_deve = tidh->dest_se_deve;
1807                 dest_pr_reg = tidh->dest_pr_reg;
1808                 dest_local_nexus = tidh->dest_local_nexus;
1809
1810                 list_del(&tidh->dest_list);
1811                 kfree(tidh);
1812
1813                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1814                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1815                                                 PR_REG_ISID_ID_LEN);
1816
1817                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1818                                         dest_pr_reg, 0, 0);
1819
1820                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1821                         " registered Transport ID for Node: %s%s Mapped LUN:"
1822                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1823                         dest_node_acl->initiatorname, (prf_isid) ?
1824                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1825
1826                 if (dest_local_nexus)
1827                         continue;
1828
1829                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1830                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1831                 core_scsi3_tpg_undepend_item(dest_tpg);
1832         }
1833
1834         return 0;
1835 out:
1836         transport_kunmap_data_sg(cmd);
1837         /*
1838          * For the failure case, release everything from tid_dest_list
1839          * including *dest_pr_reg and the configfs dependances..
1840          */
1841         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1842                 dest_tpg = tidh->dest_tpg;
1843                 dest_node_acl = tidh->dest_node_acl;
1844                 dest_se_deve = tidh->dest_se_deve;
1845                 dest_pr_reg = tidh->dest_pr_reg;
1846                 dest_local_nexus = tidh->dest_local_nexus;
1847
1848                 list_del(&tidh->dest_list);
1849                 kfree(tidh);
1850                 /*
1851                  * Release any extra ALL_TG_PT=1 registrations for
1852                  * the SPEC_I_PT=1 case.
1853                  */
1854                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1855                                 &dest_pr_reg->pr_reg_atp_list,
1856                                 pr_reg_atp_mem_list) {
1857                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1858                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1859                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1860                 }
1861
1862                 kfree(dest_pr_reg->pr_aptpl_buf);
1863                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1864
1865                 if (dest_local_nexus)
1866                         continue;
1867
1868                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1869                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1870                 core_scsi3_tpg_undepend_item(dest_tpg);
1871         }
1872         return ret;
1873 }
1874
1875 /*
1876  * Called with struct se_device->dev_reservation_lock held
1877  */
1878 static int __core_scsi3_update_aptpl_buf(
1879         struct se_device *dev,
1880         unsigned char *buf,
1881         u32 pr_aptpl_buf_len,
1882         int clear_aptpl_metadata)
1883 {
1884         struct se_lun *lun;
1885         struct se_portal_group *tpg;
1886         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1887         struct t10_pr_registration *pr_reg;
1888         unsigned char tmp[512], isid_buf[32];
1889         ssize_t len = 0;
1890         int reg_count = 0;
1891
1892         memset(buf, 0, pr_aptpl_buf_len);
1893         /*
1894          * Called to clear metadata once APTPL has been deactivated.
1895          */
1896         if (clear_aptpl_metadata) {
1897                 snprintf(buf, pr_aptpl_buf_len,
1898                                 "No Registrations or Reservations\n");
1899                 return 0;
1900         }
1901         /*
1902          * Walk the registration list..
1903          */
1904         spin_lock(&su_dev->t10_pr.registration_lock);
1905         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1906                         pr_reg_list) {
1907
1908                 tmp[0] = '\0';
1909                 isid_buf[0] = '\0';
1910                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1911                 lun = pr_reg->pr_reg_tg_pt_lun;
1912                 /*
1913                  * Write out any ISID value to APTPL metadata that was included
1914                  * in the original registration.
1915                  */
1916                 if (pr_reg->isid_present_at_reg)
1917                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1918                                         pr_reg->pr_reg_isid);
1919                 /*
1920                  * Include special metadata if the pr_reg matches the
1921                  * reservation holder.
1922                  */
1923                 if (dev->dev_pr_res_holder == pr_reg) {
1924                         snprintf(tmp, 512, "PR_REG_START: %d"
1925                                 "\ninitiator_fabric=%s\n"
1926                                 "initiator_node=%s\n%s"
1927                                 "sa_res_key=%llu\n"
1928                                 "res_holder=1\nres_type=%02x\n"
1929                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1930                                 "mapped_lun=%u\n", reg_count,
1931                                 tpg->se_tpg_tfo->get_fabric_name(),
1932                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1933                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1934                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1935                                 pr_reg->pr_res_mapped_lun);
1936                 } else {
1937                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1938                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1939                                 "sa_res_key=%llu\nres_holder=0\n"
1940                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1941                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1942                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1943                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1944                                 pr_reg->pr_res_mapped_lun);
1945                 }
1946
1947                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1948                         pr_err("Unable to update renaming"
1949                                 " APTPL metadata\n");
1950                         spin_unlock(&su_dev->t10_pr.registration_lock);
1951                         return -EMSGSIZE;
1952                 }
1953                 len += sprintf(buf+len, "%s", tmp);
1954
1955                 /*
1956                  * Include information about the associated SCSI target port.
1957                  */
1958                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1959                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1960                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1961                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1962                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1963                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1964
1965                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1966                         pr_err("Unable to update renaming"
1967                                 " APTPL metadata\n");
1968                         spin_unlock(&su_dev->t10_pr.registration_lock);
1969                         return -EMSGSIZE;
1970                 }
1971                 len += sprintf(buf+len, "%s", tmp);
1972                 reg_count++;
1973         }
1974         spin_unlock(&su_dev->t10_pr.registration_lock);
1975
1976         if (!reg_count)
1977                 len += sprintf(buf+len, "No Registrations or Reservations");
1978
1979         return 0;
1980 }
1981
1982 static int core_scsi3_update_aptpl_buf(
1983         struct se_device *dev,
1984         unsigned char *buf,
1985         u32 pr_aptpl_buf_len,
1986         int clear_aptpl_metadata)
1987 {
1988         int ret;
1989
1990         spin_lock(&dev->dev_reservation_lock);
1991         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1992                                 clear_aptpl_metadata);
1993         spin_unlock(&dev->dev_reservation_lock);
1994
1995         return ret;
1996 }
1997
1998 /*
1999  * Called with struct se_device->aptpl_file_mutex held
2000  */
2001 static int __core_scsi3_write_aptpl_to_file(
2002         struct se_device *dev,
2003         unsigned char *buf,
2004         u32 pr_aptpl_buf_len)
2005 {
2006         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
2007         struct file *file;
2008         struct iovec iov[1];
2009         mm_segment_t old_fs;
2010         int flags = O_RDWR | O_CREAT | O_TRUNC;
2011         char path[512];
2012         int ret;
2013
2014         memset(iov, 0, sizeof(struct iovec));
2015         memset(path, 0, 512);
2016
2017         if (strlen(&wwn->unit_serial[0]) >= 512) {
2018                 pr_err("WWN value for struct se_device does not fit"
2019                         " into path buffer\n");
2020                 return -EMSGSIZE;
2021         }
2022
2023         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2024         file = filp_open(path, flags, 0600);
2025         if (IS_ERR(file) || !file || !file->f_dentry) {
2026                 pr_err("filp_open(%s) for APTPL metadata"
2027                         " failed\n", path);
2028                 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2029         }
2030
2031         iov[0].iov_base = &buf[0];
2032         if (!pr_aptpl_buf_len)
2033                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2034         else
2035                 iov[0].iov_len = pr_aptpl_buf_len;
2036
2037         old_fs = get_fs();
2038         set_fs(get_ds());
2039         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2040         set_fs(old_fs);
2041
2042         if (ret < 0) {
2043                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2044                 filp_close(file, NULL);
2045                 return -EIO;
2046         }
2047         filp_close(file, NULL);
2048
2049         return 0;
2050 }
2051
2052 static int core_scsi3_update_and_write_aptpl(
2053         struct se_device *dev,
2054         unsigned char *in_buf,
2055         u32 in_pr_aptpl_buf_len)
2056 {
2057         unsigned char null_buf[64], *buf;
2058         u32 pr_aptpl_buf_len;
2059         int ret, clear_aptpl_metadata = 0;
2060         /*
2061          * Can be called with a NULL pointer from PROUT service action CLEAR
2062          */
2063         if (!in_buf) {
2064                 memset(null_buf, 0, 64);
2065                 buf = &null_buf[0];
2066                 /*
2067                  * This will clear the APTPL metadata to:
2068                  * "No Registrations or Reservations" status
2069                  */
2070                 pr_aptpl_buf_len = 64;
2071                 clear_aptpl_metadata = 1;
2072         } else {
2073                 buf = in_buf;
2074                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2075         }
2076
2077         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2078                                 clear_aptpl_metadata);
2079         if (ret != 0)
2080                 return ret;
2081         /*
2082          * __core_scsi3_write_aptpl_to_file() will call strlen()
2083          * on the passed buf to determine pr_aptpl_buf_len.
2084          */
2085         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2086         if (ret != 0)
2087                 return ret;
2088
2089         return ret;
2090 }
2091
2092 static int core_scsi3_emulate_pro_register(
2093         struct se_cmd *cmd,
2094         u64 res_key,
2095         u64 sa_res_key,
2096         int aptpl,
2097         int all_tg_pt,
2098         int spec_i_pt,
2099         int ignore_key)
2100 {
2101         struct se_session *se_sess = cmd->se_sess;
2102         struct se_device *dev = cmd->se_dev;
2103         struct se_dev_entry *se_deve;
2104         struct se_lun *se_lun = cmd->se_lun;
2105         struct se_portal_group *se_tpg;
2106         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2107         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2108         /* Used for APTPL metadata w/ UNREGISTER */
2109         unsigned char *pr_aptpl_buf = NULL;
2110         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2111         int pr_holder = 0, ret = 0, type;
2112
2113         if (!se_sess || !se_lun) {
2114                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2115                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2116                 return -EINVAL;
2117         }
2118         se_tpg = se_sess->se_tpg;
2119         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2120
2121         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2122                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2123                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2124                                 PR_REG_ISID_LEN);
2125                 isid_ptr = &isid_buf[0];
2126         }
2127         /*
2128          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2129          */
2130         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2131         if (!pr_reg_e) {
2132                 if (res_key) {
2133                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2134                                 " for SA REGISTER, returning CONFLICT\n");
2135                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2136                         return -EINVAL;
2137                 }
2138                 /*
2139                  * Do nothing but return GOOD status.
2140                  */
2141                 if (!sa_res_key)
2142                         return 0;
2143
2144                 if (!spec_i_pt) {
2145                         /*
2146                          * Perform the Service Action REGISTER on the Initiator
2147                          * Port Endpoint that the PRO was received from on the
2148                          * Logical Unit of the SCSI device server.
2149                          */
2150                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2151                                         se_sess->se_node_acl, se_deve, isid_ptr,
2152                                         sa_res_key, all_tg_pt, aptpl,
2153                                         ignore_key, 0);
2154                         if (ret != 0) {
2155                                 pr_err("Unable to allocate"
2156                                         " struct t10_pr_registration\n");
2157                                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2158                                 return -EINVAL;
2159                         }
2160                 } else {
2161                         /*
2162                          * Register both the Initiator port that received
2163                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2164                          * TransportID from Parameter list and loop through
2165                          * fabric dependent parameter list while calling
2166                          * logic from of core_scsi3_alloc_registration() for
2167                          * each TransportID provided SCSI Initiator Port/Device
2168                          */
2169                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2170                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2171                         if (ret != 0)
2172                                 return ret;
2173                 }
2174                 /*
2175                  * Nothing left to do for the APTPL=0 case.
2176                  */
2177                 if (!aptpl) {
2178                         pr_tmpl->pr_aptpl_active = 0;
2179                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2180                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2181                                         " REGISTER\n");
2182                         return 0;
2183                 }
2184                 /*
2185                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2186                  * update the APTPL metadata information using its
2187                  * preallocated *pr_reg->pr_aptpl_buf.
2188                  */
2189                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2190                                 se_sess->se_node_acl, se_sess);
2191
2192                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2193                                 &pr_reg->pr_aptpl_buf[0],
2194                                 pr_tmpl->pr_aptpl_buf_len);
2195                 if (!ret) {
2196                         pr_tmpl->pr_aptpl_active = 1;
2197                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2198                 }
2199
2200                 core_scsi3_put_pr_reg(pr_reg);
2201                 return ret;
2202         } else {
2203                 /*
2204                  * Locate the existing *pr_reg via struct se_node_acl pointers
2205                  */
2206                 pr_reg = pr_reg_e;
2207                 type = pr_reg->pr_res_type;
2208
2209                 if (!ignore_key) {
2210                         if (res_key != pr_reg->pr_res_key) {
2211                                 pr_err("SPC-3 PR REGISTER: Received"
2212                                         " res_key: 0x%016Lx does not match"
2213                                         " existing SA REGISTER res_key:"
2214                                         " 0x%016Lx\n", res_key,
2215                                         pr_reg->pr_res_key);
2216                                 core_scsi3_put_pr_reg(pr_reg);
2217                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2218                                 return -EINVAL;
2219                         }
2220                 }
2221                 if (spec_i_pt) {
2222                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2223                                 " set while sa_res_key=0\n");
2224                         core_scsi3_put_pr_reg(pr_reg);
2225                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2226                         return -EINVAL;
2227                 }
2228                 /*
2229                  * An existing ALL_TG_PT=1 registration being released
2230                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2231                  */
2232                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2233                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2234                                 " registration exists, but ALL_TG_PT=1 bit not"
2235                                 " present in received PROUT\n");
2236                         core_scsi3_put_pr_reg(pr_reg);
2237                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2238                         return -EINVAL;
2239                 }
2240                 /*
2241                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2242                  */
2243                 if (aptpl) {
2244                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2245                                                 GFP_KERNEL);
2246                         if (!pr_aptpl_buf) {
2247                                 pr_err("Unable to allocate"
2248                                         " pr_aptpl_buf\n");
2249                                 core_scsi3_put_pr_reg(pr_reg);
2250                                 cmd->scsi_sense_reason =
2251                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2252                                 return -EINVAL;
2253                         }
2254                 }
2255                 /*
2256                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2257                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2258                  * Nexus.
2259                  */
2260                 if (!sa_res_key) {
2261                         pr_holder = core_scsi3_check_implict_release(
2262                                         cmd->se_dev, pr_reg);
2263                         if (pr_holder < 0) {
2264                                 kfree(pr_aptpl_buf);
2265                                 core_scsi3_put_pr_reg(pr_reg);
2266                                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2267                                 return -EINVAL;
2268                         }
2269
2270                         spin_lock(&pr_tmpl->registration_lock);
2271                         /*
2272                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2273                          * and matching pr_res_key.
2274                          */
2275                         if (pr_reg->pr_reg_all_tg_pt) {
2276                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2277                                                 &pr_tmpl->registration_list,
2278                                                 pr_reg_list) {
2279
2280                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2281                                                 continue;
2282
2283                                         if (pr_reg_p->pr_res_key != res_key)
2284                                                 continue;
2285
2286                                         if (pr_reg == pr_reg_p)
2287                                                 continue;
2288
2289                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2290                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2291                                                 continue;
2292
2293                                         __core_scsi3_free_registration(dev,
2294                                                         pr_reg_p, NULL, 0);
2295                                 }
2296                         }
2297                         /*
2298                          * Release the calling I_T Nexus registration now..
2299                          */
2300                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2301                                                         NULL, 1);
2302                         /*
2303                          * From spc4r17, section 5.7.11.3 Unregistering
2304                          *
2305                          * If the persistent reservation is a registrants only
2306                          * type, the device server shall establish a unit
2307                          * attention condition for the initiator port associated
2308                          * with every registered I_T nexus except for the I_T
2309                          * nexus on which the PERSISTENT RESERVE OUT command was
2310                          * received, with the additional sense code set to
2311                          * RESERVATIONS RELEASED.
2312                          */
2313                         if (pr_holder &&
2314                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2315                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2316                                 list_for_each_entry(pr_reg_p,
2317                                                 &pr_tmpl->registration_list,
2318                                                 pr_reg_list) {
2319
2320                                         core_scsi3_ua_allocate(
2321                                                 pr_reg_p->pr_reg_nacl,
2322                                                 pr_reg_p->pr_res_mapped_lun,
2323                                                 0x2A,
2324                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2325                                 }
2326                         }
2327                         spin_unlock(&pr_tmpl->registration_lock);
2328
2329                         if (!aptpl) {
2330                                 pr_tmpl->pr_aptpl_active = 0;
2331                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2332                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2333                                                 " for UNREGISTER\n");
2334                                 return 0;
2335                         }
2336
2337                         ret = core_scsi3_update_and_write_aptpl(dev,
2338                                         &pr_aptpl_buf[0],
2339                                         pr_tmpl->pr_aptpl_buf_len);
2340                         if (!ret) {
2341                                 pr_tmpl->pr_aptpl_active = 1;
2342                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2343                                                 " for UNREGISTER\n");
2344                         }
2345
2346                         kfree(pr_aptpl_buf);
2347                         return ret;
2348                 } else {
2349                         /*
2350                          * Increment PRgeneration counter for struct se_device"
2351                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2352                          * READ_KEYS service action.
2353                          */
2354                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2355                                                         cmd->se_dev);
2356                         pr_reg->pr_res_key = sa_res_key;
2357                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2358                                 " Key for %s to: 0x%016Lx PRgeneration:"
2359                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2360                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2361                                 pr_reg->pr_reg_nacl->initiatorname,
2362                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2363
2364                         if (!aptpl) {
2365                                 pr_tmpl->pr_aptpl_active = 0;
2366                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2367                                 core_scsi3_put_pr_reg(pr_reg);
2368                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2369                                                 " for REGISTER\n");
2370                                 return 0;
2371                         }
2372
2373                         ret = core_scsi3_update_and_write_aptpl(dev,
2374                                         &pr_aptpl_buf[0],
2375                                         pr_tmpl->pr_aptpl_buf_len);
2376                         if (!ret) {
2377                                 pr_tmpl->pr_aptpl_active = 1;
2378                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2379                                                 " for REGISTER\n");
2380                         }
2381
2382                         kfree(pr_aptpl_buf);
2383                         core_scsi3_put_pr_reg(pr_reg);
2384                 }
2385         }
2386         return 0;
2387 }
2388
2389 unsigned char *core_scsi3_pr_dump_type(int type)
2390 {
2391         switch (type) {
2392         case PR_TYPE_WRITE_EXCLUSIVE:
2393                 return "Write Exclusive Access";
2394         case PR_TYPE_EXCLUSIVE_ACCESS:
2395                 return "Exclusive Access";
2396         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2397                 return "Write Exclusive Access, Registrants Only";
2398         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2399                 return "Exclusive Access, Registrants Only";
2400         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2401                 return "Write Exclusive Access, All Registrants";
2402         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2403                 return "Exclusive Access, All Registrants";
2404         default:
2405                 break;
2406         }
2407
2408         return "Unknown SPC-3 PR Type";
2409 }
2410
2411 static int core_scsi3_pro_reserve(
2412         struct se_cmd *cmd,
2413         struct se_device *dev,
2414         int type,
2415         int scope,
2416         u64 res_key)
2417 {
2418         struct se_session *se_sess = cmd->se_sess;
2419         struct se_dev_entry *se_deve;
2420         struct se_lun *se_lun = cmd->se_lun;
2421         struct se_portal_group *se_tpg;
2422         struct t10_pr_registration *pr_reg, *pr_res_holder;
2423         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2424         char i_buf[PR_REG_ISID_ID_LEN];
2425         int ret, prf_isid;
2426
2427         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2428
2429         if (!se_sess || !se_lun) {
2430                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2431                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2432                 return -EINVAL;
2433         }
2434         se_tpg = se_sess->se_tpg;
2435         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2436         /*
2437          * Locate the existing *pr_reg via struct se_node_acl pointers
2438          */
2439         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2440                                 se_sess);
2441         if (!pr_reg) {
2442                 pr_err("SPC-3 PR: Unable to locate"
2443                         " PR_REGISTERED *pr_reg for RESERVE\n");
2444                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2445                 return -EINVAL;
2446         }
2447         /*
2448          * From spc4r17 Section 5.7.9: Reserving:
2449          *
2450          * An application client creates a persistent reservation by issuing
2451          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2452          * a registered I_T nexus with the following parameters:
2453          *    a) RESERVATION KEY set to the value of the reservation key that is
2454          *       registered with the logical unit for the I_T nexus; and
2455          */
2456         if (res_key != pr_reg->pr_res_key) {
2457                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2458                         " does not match existing SA REGISTER res_key:"
2459                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2460                 core_scsi3_put_pr_reg(pr_reg);
2461                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2462                 return -EINVAL;
2463         }
2464         /*
2465          * From spc4r17 Section 5.7.9: Reserving:
2466          *
2467          * From above:
2468          *  b) TYPE field and SCOPE field set to the persistent reservation
2469          *     being created.
2470          *
2471          * Only one persistent reservation is allowed at a time per logical unit
2472          * and that persistent reservation has a scope of LU_SCOPE.
2473          */
2474         if (scope != PR_SCOPE_LU_SCOPE) {
2475                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2476                 core_scsi3_put_pr_reg(pr_reg);
2477                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2478                 return -EINVAL;
2479         }
2480         /*
2481          * See if we have an existing PR reservation holder pointer at
2482          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2483          * *pr_res_holder.
2484          */
2485         spin_lock(&dev->dev_reservation_lock);
2486         pr_res_holder = dev->dev_pr_res_holder;
2487         if ((pr_res_holder)) {
2488                 /*
2489                  * From spc4r17 Section 5.7.9: Reserving:
2490                  *
2491                  * If the device server receives a PERSISTENT RESERVE OUT
2492                  * command from an I_T nexus other than a persistent reservation
2493                  * holder (see 5.7.10) that attempts to create a persistent
2494                  * reservation when a persistent reservation already exists for
2495                  * the logical unit, then the command shall be completed with
2496                  * RESERVATION CONFLICT status.
2497                  */
2498                 if (pr_res_holder != pr_reg) {
2499                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2500                         pr_err("SPC-3 PR: Attempted RESERVE from"
2501                                 " [%s]: %s while reservation already held by"
2502                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2503                                 cmd->se_tfo->get_fabric_name(),
2504                                 se_sess->se_node_acl->initiatorname,
2505                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2506                                 pr_res_holder->pr_reg_nacl->initiatorname);
2507
2508                         spin_unlock(&dev->dev_reservation_lock);
2509                         core_scsi3_put_pr_reg(pr_reg);
2510                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2511                         return -EINVAL;
2512                 }
2513                 /*
2514                  * From spc4r17 Section 5.7.9: Reserving:
2515                  *
2516                  * If a persistent reservation holder attempts to modify the
2517                  * type or scope of an existing persistent reservation, the
2518                  * command shall be completed with RESERVATION CONFLICT status.
2519                  */
2520                 if ((pr_res_holder->pr_res_type != type) ||
2521                     (pr_res_holder->pr_res_scope != scope)) {
2522                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2523                         pr_err("SPC-3 PR: Attempted RESERVE from"
2524                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2525                                 " while reservation already held by [%s]: %s,"
2526                                 " returning RESERVATION_CONFLICT\n",
2527                                 cmd->se_tfo->get_fabric_name(),
2528                                 se_sess->se_node_acl->initiatorname,
2529                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2530                                 pr_res_holder->pr_reg_nacl->initiatorname);
2531
2532                         spin_unlock(&dev->dev_reservation_lock);
2533                         core_scsi3_put_pr_reg(pr_reg);
2534                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2535                         return -EINVAL;
2536                 }
2537                 /*
2538                  * From spc4r17 Section 5.7.9: Reserving:
2539                  *
2540                  * If the device server receives a PERSISTENT RESERVE OUT
2541                  * command with RESERVE service action where the TYPE field and
2542                  * the SCOPE field contain the same values as the existing type
2543                  * and scope from a persistent reservation holder, it shall not
2544                  * make any change to the existing persistent reservation and
2545                  * shall completethe command with GOOD status.
2546                  */
2547                 spin_unlock(&dev->dev_reservation_lock);
2548                 core_scsi3_put_pr_reg(pr_reg);
2549                 return 0;
2550         }
2551         /*
2552          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2553          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2554          */
2555         pr_reg->pr_res_scope = scope;
2556         pr_reg->pr_res_type = type;
2557         pr_reg->pr_res_holder = 1;
2558         dev->dev_pr_res_holder = pr_reg;
2559         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2560                                 PR_REG_ISID_ID_LEN);
2561
2562         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2563                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2564                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2565                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2566         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2567                         cmd->se_tfo->get_fabric_name(),
2568                         se_sess->se_node_acl->initiatorname,
2569                         (prf_isid) ? &i_buf[0] : "");
2570         spin_unlock(&dev->dev_reservation_lock);
2571
2572         if (pr_tmpl->pr_aptpl_active) {
2573                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2574                                 &pr_reg->pr_aptpl_buf[0],
2575                                 pr_tmpl->pr_aptpl_buf_len);
2576                 if (!ret)
2577                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2578                                         " for RESERVE\n");
2579         }
2580
2581         core_scsi3_put_pr_reg(pr_reg);
2582         return 0;
2583 }
2584
2585 static int core_scsi3_emulate_pro_reserve(
2586         struct se_cmd *cmd,
2587         int type,
2588         int scope,
2589         u64 res_key)
2590 {
2591         struct se_device *dev = cmd->se_dev;
2592         int ret = 0;
2593
2594         switch (type) {
2595         case PR_TYPE_WRITE_EXCLUSIVE:
2596         case PR_TYPE_EXCLUSIVE_ACCESS:
2597         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2598         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2599         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2600         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2601                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2602                 break;
2603         default:
2604                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2605                         " 0x%02x\n", type);
2606                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2607                 return -EINVAL;
2608         }
2609
2610         return ret;
2611 }
2612
2613 /*
2614  * Called with struct se_device->dev_reservation_lock held.
2615  */
2616 static void __core_scsi3_complete_pro_release(
2617         struct se_device *dev,
2618         struct se_node_acl *se_nacl,
2619         struct t10_pr_registration *pr_reg,
2620         int explict)
2621 {
2622         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2623         char i_buf[PR_REG_ISID_ID_LEN];
2624         int prf_isid;
2625
2626         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2627         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2628                                 PR_REG_ISID_ID_LEN);
2629         /*
2630          * Go ahead and release the current PR reservation holder.
2631          */
2632         dev->dev_pr_res_holder = NULL;
2633
2634         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2635                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2636                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2637                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2638                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2639         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2640                 tfo->get_fabric_name(), se_nacl->initiatorname,
2641                 (prf_isid) ? &i_buf[0] : "");
2642         /*
2643          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2644          */
2645         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2646 }
2647
2648 static int core_scsi3_emulate_pro_release(
2649         struct se_cmd *cmd,
2650         int type,
2651         int scope,
2652         u64 res_key)
2653 {
2654         struct se_device *dev = cmd->se_dev;
2655         struct se_session *se_sess = cmd->se_sess;
2656         struct se_lun *se_lun = cmd->se_lun;
2657         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2658         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2659         int ret, all_reg = 0;
2660
2661         if (!se_sess || !se_lun) {
2662                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2663                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2664                 return -EINVAL;
2665         }
2666         /*
2667          * Locate the existing *pr_reg via struct se_node_acl pointers
2668          */
2669         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2670         if (!pr_reg) {
2671                 pr_err("SPC-3 PR: Unable to locate"
2672                         " PR_REGISTERED *pr_reg for RELEASE\n");
2673                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2674                 return -EINVAL;
2675         }
2676         /*
2677          * From spc4r17 Section 5.7.11.2 Releasing:
2678          *
2679          * If there is no persistent reservation or in response to a persistent
2680          * reservation release request from a registered I_T nexus that is not a
2681          * persistent reservation holder (see 5.7.10), the device server shall
2682          * do the following:
2683          *
2684          *     a) Not release the persistent reservation, if any;
2685          *     b) Not remove any registrations; and
2686          *     c) Complete the command with GOOD status.
2687          */
2688         spin_lock(&dev->dev_reservation_lock);
2689         pr_res_holder = dev->dev_pr_res_holder;
2690         if (!pr_res_holder) {
2691                 /*
2692                  * No persistent reservation, return GOOD status.
2693                  */
2694                 spin_unlock(&dev->dev_reservation_lock);
2695                 core_scsi3_put_pr_reg(pr_reg);
2696                 return 0;
2697         }
2698         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2699             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2700                 all_reg = 1;
2701
2702         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2703                 /*
2704                  * Non 'All Registrants' PR Type cases..
2705                  * Release request from a registered I_T nexus that is not a
2706                  * persistent reservation holder. return GOOD status.
2707                  */
2708                 spin_unlock(&dev->dev_reservation_lock);
2709                 core_scsi3_put_pr_reg(pr_reg);
2710                 return 0;
2711         }
2712         /*
2713          * From spc4r17 Section 5.7.11.2 Releasing:
2714          *
2715          * Only the persistent reservation holder (see 5.7.10) is allowed to
2716          * release a persistent reservation.
2717          *
2718          * An application client releases the persistent reservation by issuing
2719          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2720          * an I_T nexus that is a persistent reservation holder with the
2721          * following parameters:
2722          *
2723          *     a) RESERVATION KEY field set to the value of the reservation key
2724          *        that is registered with the logical unit for the I_T nexus;
2725          */
2726         if (res_key != pr_reg->pr_res_key) {
2727                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2728                         " does not match existing SA REGISTER res_key:"
2729                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2730                 spin_unlock(&dev->dev_reservation_lock);
2731                 core_scsi3_put_pr_reg(pr_reg);
2732                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2733                 return -EINVAL;
2734         }
2735         /*
2736          * From spc4r17 Section 5.7.11.2 Releasing and above:
2737          *
2738          * b) TYPE field and SCOPE field set to match the persistent
2739          *    reservation being released.
2740          */
2741         if ((pr_res_holder->pr_res_type != type) ||
2742             (pr_res_holder->pr_res_scope != scope)) {
2743                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2744                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2745                         " reservation from [%s]: %s with different TYPE "
2746                         "and/or SCOPE  while reservation already held by"
2747                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2748                         cmd->se_tfo->get_fabric_name(),
2749                         se_sess->se_node_acl->initiatorname,
2750                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2751                         pr_res_holder->pr_reg_nacl->initiatorname);
2752
2753                 spin_unlock(&dev->dev_reservation_lock);
2754                 core_scsi3_put_pr_reg(pr_reg);
2755                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2756                 return -EINVAL;
2757         }
2758         /*
2759          * In response to a persistent reservation release request from the
2760          * persistent reservation holder the device server shall perform a
2761          * release by doing the following as an uninterrupted series of actions:
2762          * a) Release the persistent reservation;
2763          * b) Not remove any registration(s);
2764          * c) If the released persistent reservation is a registrants only type
2765          * or all registrants type persistent reservation,
2766          *    the device server shall establish a unit attention condition for
2767          *    the initiator port associated with every regis-
2768          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2769          *    RESERVE OUT command with RELEASE service action was received,
2770          *    with the additional sense code set to RESERVATIONS RELEASED; and
2771          * d) If the persistent reservation is of any other type, the device
2772          *    server shall not establish a unit attention condition.
2773          */
2774         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2775                         pr_reg, 1);
2776
2777         spin_unlock(&dev->dev_reservation_lock);
2778
2779         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2780             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2781             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2782             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2783                 /*
2784                  * If no UNIT ATTENTION conditions will be established for
2785                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2786                  * go ahead and check for APTPL=1 update+write below
2787                  */
2788                 goto write_aptpl;
2789         }
2790
2791         spin_lock(&pr_tmpl->registration_lock);
2792         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2793                         pr_reg_list) {
2794                 /*
2795                  * Do not establish a UNIT ATTENTION condition
2796                  * for the calling I_T Nexus
2797                  */
2798                 if (pr_reg_p == pr_reg)
2799                         continue;
2800
2801                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2802                                 pr_reg_p->pr_res_mapped_lun,
2803                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2804         }
2805         spin_unlock(&pr_tmpl->registration_lock);
2806
2807 write_aptpl:
2808         if (pr_tmpl->pr_aptpl_active) {
2809                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2810                                 &pr_reg->pr_aptpl_buf[0],
2811                                 pr_tmpl->pr_aptpl_buf_len);
2812                 if (!ret)
2813                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2814         }
2815
2816         core_scsi3_put_pr_reg(pr_reg);
2817         return 0;
2818 }
2819
2820 static int core_scsi3_emulate_pro_clear(
2821         struct se_cmd *cmd,
2822         u64 res_key)
2823 {
2824         struct se_device *dev = cmd->se_dev;
2825         struct se_node_acl *pr_reg_nacl;
2826         struct se_session *se_sess = cmd->se_sess;
2827         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2828         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2829         u32 pr_res_mapped_lun = 0;
2830         int calling_it_nexus = 0;
2831         /*
2832          * Locate the existing *pr_reg via struct se_node_acl pointers
2833          */
2834         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2835                         se_sess->se_node_acl, se_sess);
2836         if (!pr_reg_n) {
2837                 pr_err("SPC-3 PR: Unable to locate"
2838                         " PR_REGISTERED *pr_reg for CLEAR\n");
2839                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2840                 return -EINVAL;
2841         }
2842         /*
2843          * From spc4r17 section 5.7.11.6, Clearing:
2844          *
2845          * Any application client may release the persistent reservation and
2846          * remove all registrations from a device server by issuing a
2847          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2848          * registered I_T nexus with the following parameter:
2849          *
2850          *      a) RESERVATION KEY field set to the value of the reservation key
2851          *         that is registered with the logical unit for the I_T nexus.
2852          */
2853         if (res_key != pr_reg_n->pr_res_key) {
2854                 pr_err("SPC-3 PR REGISTER: Received"
2855                         " res_key: 0x%016Lx does not match"
2856                         " existing SA REGISTER res_key:"
2857                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2858                 core_scsi3_put_pr_reg(pr_reg_n);
2859                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2860                 return -EINVAL;
2861         }
2862         /*
2863          * a) Release the persistent reservation, if any;
2864          */
2865         spin_lock(&dev->dev_reservation_lock);
2866         pr_res_holder = dev->dev_pr_res_holder;
2867         if (pr_res_holder) {
2868                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2869                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2870                         pr_res_holder, 0);
2871         }
2872         spin_unlock(&dev->dev_reservation_lock);
2873         /*
2874          * b) Remove all registration(s) (see spc4r17 5.7.7);
2875          */
2876         spin_lock(&pr_tmpl->registration_lock);
2877         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2878                         &pr_tmpl->registration_list, pr_reg_list) {
2879
2880                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2881                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2882                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2883                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2884                                         calling_it_nexus);
2885                 /*
2886                  * e) Establish a unit attention condition for the initiator
2887                  *    port associated with every registered I_T nexus other
2888                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2889                  *    command with CLEAR service action was received, with the
2890                  *    additional sense code set to RESERVATIONS PREEMPTED.
2891                  */
2892                 if (!calling_it_nexus)
2893                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2894                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2895         }
2896         spin_unlock(&pr_tmpl->registration_lock);
2897
2898         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2899                 cmd->se_tfo->get_fabric_name());
2900
2901         if (pr_tmpl->pr_aptpl_active) {
2902                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2903                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2904                                 " for CLEAR\n");
2905         }
2906
2907         core_scsi3_pr_generation(dev);
2908         return 0;
2909 }
2910
2911 /*
2912  * Called with struct se_device->dev_reservation_lock held.
2913  */
2914 static void __core_scsi3_complete_pro_preempt(
2915         struct se_device *dev,
2916         struct t10_pr_registration *pr_reg,
2917         struct list_head *preempt_and_abort_list,
2918         int type,
2919         int scope,
2920         int abort)
2921 {
2922         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2923         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2924         char i_buf[PR_REG_ISID_ID_LEN];
2925         int prf_isid;
2926
2927         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2928         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2929                                 PR_REG_ISID_ID_LEN);
2930         /*
2931          * Do an implict RELEASE of the existing reservation.
2932          */
2933         if (dev->dev_pr_res_holder)
2934                 __core_scsi3_complete_pro_release(dev, nacl,
2935                                 dev->dev_pr_res_holder, 0);
2936
2937         dev->dev_pr_res_holder = pr_reg;
2938         pr_reg->pr_res_holder = 1;
2939         pr_reg->pr_res_type = type;
2940         pr_reg->pr_res_scope = scope;
2941
2942         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2943                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2944                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2945                 core_scsi3_pr_dump_type(type),
2946                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2947         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2948                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2949                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2950         /*
2951          * For PREEMPT_AND_ABORT, add the preempting reservation's
2952          * struct t10_pr_registration to the list that will be compared
2953          * against received CDBs..
2954          */
2955         if (preempt_and_abort_list)
2956                 list_add_tail(&pr_reg->pr_reg_abort_list,
2957                                 preempt_and_abort_list);
2958 }
2959
2960 static void core_scsi3_release_preempt_and_abort(
2961         struct list_head *preempt_and_abort_list,
2962         struct t10_pr_registration *pr_reg_holder)
2963 {
2964         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2965
2966         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2967                                 pr_reg_abort_list) {
2968
2969                 list_del(&pr_reg->pr_reg_abort_list);
2970                 if (pr_reg_holder == pr_reg)
2971                         continue;
2972                 if (pr_reg->pr_res_holder) {
2973                         pr_warn("pr_reg->pr_res_holder still set\n");
2974                         continue;
2975                 }
2976
2977                 pr_reg->pr_reg_deve = NULL;
2978                 pr_reg->pr_reg_nacl = NULL;
2979                 kfree(pr_reg->pr_aptpl_buf);
2980                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2981         }
2982 }
2983
2984 static int core_scsi3_pro_preempt(
2985         struct se_cmd *cmd,
2986         int type,
2987         int scope,
2988         u64 res_key,
2989         u64 sa_res_key,
2990         int abort)
2991 {
2992         struct se_device *dev = cmd->se_dev;
2993         struct se_dev_entry *se_deve;
2994         struct se_node_acl *pr_reg_nacl;
2995         struct se_session *se_sess = cmd->se_sess;
2996         LIST_HEAD(preempt_and_abort_list);
2997         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2998         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2999         u32 pr_res_mapped_lun = 0;
3000         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
3001         int prh_type = 0, prh_scope = 0, ret;
3002
3003         if (!se_sess) {
3004                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3005                 return -EINVAL;
3006         }
3007
3008         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3009         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3010                                 se_sess);
3011         if (!pr_reg_n) {
3012                 pr_err("SPC-3 PR: Unable to locate"
3013                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
3014                         (abort) ? "_AND_ABORT" : "");
3015                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3016                 return -EINVAL;
3017         }
3018         if (pr_reg_n->pr_res_key != res_key) {
3019                 core_scsi3_put_pr_reg(pr_reg_n);
3020                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3021                 return -EINVAL;
3022         }
3023         if (scope != PR_SCOPE_LU_SCOPE) {
3024                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
3025                 core_scsi3_put_pr_reg(pr_reg_n);
3026                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3027                 return -EINVAL;
3028         }
3029
3030         spin_lock(&dev->dev_reservation_lock);
3031         pr_res_holder = dev->dev_pr_res_holder;
3032         if (pr_res_holder &&
3033            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3034             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3035                 all_reg = 1;
3036
3037         if (!all_reg && !sa_res_key) {
3038                 spin_unlock(&dev->dev_reservation_lock);
3039                 core_scsi3_put_pr_reg(pr_reg_n);
3040                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3041                 return -EINVAL;
3042         }
3043         /*
3044          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3045          *
3046          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3047          * persistent reservation holder or there is no persistent reservation
3048          * holder (i.e., there is no persistent reservation), then the device
3049          * server shall perform a preempt by doing the following in an
3050          * uninterrupted series of actions. (See below..)
3051          */
3052         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3053                 /*
3054                  * No existing or SA Reservation Key matching reservations..
3055                  *
3056                  * PROUT SA PREEMPT with All Registrant type reservations are
3057                  * allowed to be processed without a matching SA Reservation Key
3058                  */
3059                 spin_lock(&pr_tmpl->registration_lock);
3060                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3061                                 &pr_tmpl->registration_list, pr_reg_list) {
3062                         /*
3063                          * Removing of registrations in non all registrants
3064                          * type reservations without a matching SA reservation
3065                          * key.
3066                          *
3067                          * a) Remove the registrations for all I_T nexuses
3068                          *    specified by the SERVICE ACTION RESERVATION KEY
3069                          *    field;
3070                          * b) Ignore the contents of the SCOPE and TYPE fields;
3071                          * c) Process tasks as defined in 5.7.1; and
3072                          * d) Establish a unit attention condition for the
3073                          *    initiator port associated with every I_T nexus
3074                          *    that lost its registration other than the I_T
3075                          *    nexus on which the PERSISTENT RESERVE OUT command
3076                          *    was received, with the additional sense code set
3077                          *    to REGISTRATIONS PREEMPTED.
3078                          */
3079                         if (!all_reg) {
3080                                 if (pr_reg->pr_res_key != sa_res_key)
3081                                         continue;
3082
3083                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3084                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3085                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3086                                 __core_scsi3_free_registration(dev, pr_reg,
3087                                         (abort) ? &preempt_and_abort_list :
3088                                                 NULL, calling_it_nexus);
3089                                 released_regs++;
3090                         } else {
3091                                 /*
3092                                  * Case for any existing all registrants type
3093                                  * reservation, follow logic in spc4r17 section
3094                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3095                                  *
3096                                  * For a ZERO SA Reservation key, release
3097                                  * all other registrations and do an implict
3098                                  * release of active persistent reservation.
3099                                  *
3100                                  * For a non-ZERO SA Reservation key, only
3101                                  * release the matching reservation key from
3102                                  * registrations.
3103                                  */
3104                                 if ((sa_res_key) &&
3105                                      (pr_reg->pr_res_key != sa_res_key))
3106                                         continue;
3107
3108                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3109                                 if (calling_it_nexus)
3110                                         continue;
3111
3112                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3113                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3114                                 __core_scsi3_free_registration(dev, pr_reg,
3115                                         (abort) ? &preempt_and_abort_list :
3116                                                 NULL, 0);
3117                                 released_regs++;
3118                         }
3119                         if (!calling_it_nexus)
3120                                 core_scsi3_ua_allocate(pr_reg_nacl,
3121                                         pr_res_mapped_lun, 0x2A,
3122                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3123                 }
3124                 spin_unlock(&pr_tmpl->registration_lock);
3125                 /*
3126                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3127                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3128                  * RESERVATION KEY field to a value that does not match any
3129                  * registered reservation key, then the device server shall
3130                  * complete the command with RESERVATION CONFLICT status.
3131                  */
3132                 if (!released_regs) {
3133                         spin_unlock(&dev->dev_reservation_lock);
3134                         core_scsi3_put_pr_reg(pr_reg_n);
3135                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3136                         return -EINVAL;
3137                 }
3138                 /*
3139                  * For an existing all registrants type reservation
3140                  * with a zero SA rservation key, preempt the existing
3141                  * reservation with the new PR type and scope.
3142                  */
3143                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3144                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3145                                 (abort) ? &preempt_and_abort_list : NULL,
3146                                 type, scope, abort);
3147
3148                         if (abort)
3149                                 core_scsi3_release_preempt_and_abort(
3150                                         &preempt_and_abort_list, pr_reg_n);
3151                 }
3152                 spin_unlock(&dev->dev_reservation_lock);
3153
3154                 if (pr_tmpl->pr_aptpl_active) {
3155                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3156                                         &pr_reg_n->pr_aptpl_buf[0],
3157                                         pr_tmpl->pr_aptpl_buf_len);
3158                         if (!ret)
3159                                 pr_debug("SPC-3 PR: Updated APTPL"
3160                                         " metadata for  PREEMPT%s\n", (abort) ?
3161                                         "_AND_ABORT" : "");
3162                 }
3163
3164                 core_scsi3_put_pr_reg(pr_reg_n);
3165                 core_scsi3_pr_generation(cmd->se_dev);
3166                 return 0;
3167         }
3168         /*
3169          * The PREEMPTing SA reservation key matches that of the
3170          * existing persistent reservation, first, we check if
3171          * we are preempting our own reservation.
3172          * From spc4r17, section 5.7.11.4.3 Preempting
3173          * persistent reservations and registration handling
3174          *
3175          * If an all registrants persistent reservation is not
3176          * present, it is not an error for the persistent
3177          * reservation holder to preempt itself (i.e., a
3178          * PERSISTENT RESERVE OUT with a PREEMPT service action
3179          * or a PREEMPT AND ABORT service action with the
3180          * SERVICE ACTION RESERVATION KEY value equal to the
3181          * persistent reservation holder's reservation key that
3182          * is received from the persistent reservation holder).
3183          * In that case, the device server shall establish the
3184          * new persistent reservation and maintain the
3185          * registration.
3186          */
3187         prh_type = pr_res_holder->pr_res_type;
3188         prh_scope = pr_res_holder->pr_res_scope;
3189         /*
3190          * If the SERVICE ACTION RESERVATION KEY field identifies a
3191          * persistent reservation holder (see 5.7.10), the device
3192          * server shall perform a preempt by doing the following as
3193          * an uninterrupted series of actions:
3194          *
3195          * a) Release the persistent reservation for the holder
3196          *    identified by the SERVICE ACTION RESERVATION KEY field;
3197          */
3198         if (pr_reg_n != pr_res_holder)
3199                 __core_scsi3_complete_pro_release(dev,
3200                                 pr_res_holder->pr_reg_nacl,
3201                                 dev->dev_pr_res_holder, 0);
3202         /*
3203          * b) Remove the registrations for all I_T nexuses identified
3204          *    by the SERVICE ACTION RESERVATION KEY field, except the
3205          *    I_T nexus that is being used for the PERSISTENT RESERVE
3206          *    OUT command. If an all registrants persistent reservation
3207          *    is present and the SERVICE ACTION RESERVATION KEY field
3208          *    is set to zero, then all registrations shall be removed
3209          *    except for that of the I_T nexus that is being used for
3210          *    the PERSISTENT RESERVE OUT command;
3211          */
3212         spin_lock(&pr_tmpl->registration_lock);
3213         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3214                         &pr_tmpl->registration_list, pr_reg_list) {
3215
3216                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3217                 if (calling_it_nexus)
3218                         continue;
3219
3220                 if (pr_reg->pr_res_key != sa_res_key)
3221                         continue;
3222
3223                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3224                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3225                 __core_scsi3_free_registration(dev, pr_reg,
3226                                 (abort) ? &preempt_and_abort_list : NULL,
3227                                 calling_it_nexus);
3228                 /*
3229                  * e) Establish a unit attention condition for the initiator
3230                  *    port associated with every I_T nexus that lost its
3231                  *    persistent reservation and/or registration, with the
3232                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3233                  */
3234                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3235                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3236         }
3237         spin_unlock(&pr_tmpl->registration_lock);
3238         /*
3239          * c) Establish a persistent reservation for the preempting
3240          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3241          */
3242         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3243                         (abort) ? &preempt_and_abort_list : NULL,
3244                         type, scope, abort);
3245         /*
3246          * d) Process tasks as defined in 5.7.1;
3247          * e) See above..
3248          * f) If the type or scope has changed, then for every I_T nexus
3249          *    whose reservation key was not removed, except for the I_T
3250          *    nexus on which the PERSISTENT RESERVE OUT command was
3251          *    received, the device server shall establish a unit
3252          *    attention condition for the initiator port associated with
3253          *    that I_T nexus, with the additional sense code set to
3254          *    RESERVATIONS RELEASED. If the type or scope have not
3255          *    changed, then no unit attention condition(s) shall be
3256          *    established for this reason.
3257          */
3258         if ((prh_type != type) || (prh_scope != scope)) {
3259                 spin_lock(&pr_tmpl->registration_lock);
3260                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3261                                 &pr_tmpl->registration_list, pr_reg_list) {
3262
3263                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3264                         if (calling_it_nexus)
3265                                 continue;
3266
3267                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3268                                         pr_reg->pr_res_mapped_lun, 0x2A,
3269                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3270                 }
3271                 spin_unlock(&pr_tmpl->registration_lock);
3272         }
3273         spin_unlock(&dev->dev_reservation_lock);
3274         /*
3275          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3276          * All received CDBs for the matching existing reservation and
3277          * registrations undergo ABORT_TASK logic.
3278          *
3279          * From there, core_scsi3_release_preempt_and_abort() will
3280          * release every registration in the list (which have already
3281          * been removed from the primary pr_reg list), except the
3282          * new persistent reservation holder, the calling Initiator Port.
3283          */
3284         if (abort) {
3285                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3286                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3287                                                 pr_reg_n);
3288         }
3289
3290         if (pr_tmpl->pr_aptpl_active) {
3291                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3292                                 &pr_reg_n->pr_aptpl_buf[0],
3293                                 pr_tmpl->pr_aptpl_buf_len);
3294                 if (!ret)
3295                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3296                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3297         }
3298
3299         core_scsi3_put_pr_reg(pr_reg_n);
3300         core_scsi3_pr_generation(cmd->se_dev);
3301         return 0;
3302 }
3303
3304 static int core_scsi3_emulate_pro_preempt(
3305         struct se_cmd *cmd,
3306         int type,
3307         int scope,
3308         u64 res_key,
3309         u64 sa_res_key,
3310         int abort)
3311 {
3312         int ret = 0;
3313
3314         switch (type) {
3315         case PR_TYPE_WRITE_EXCLUSIVE:
3316         case PR_TYPE_EXCLUSIVE_ACCESS:
3317         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3318         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3319         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3320         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3321                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3322                                 res_key, sa_res_key, abort);
3323                 break;
3324         default:
3325                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3326                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3327                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3328                 return -EINVAL;
3329         }
3330
3331         return ret;
3332 }
3333
3334
3335 static int core_scsi3_emulate_pro_register_and_move(
3336         struct se_cmd *cmd,
3337         u64 res_key,
3338         u64 sa_res_key,
3339         int aptpl,
3340         int unreg)
3341 {
3342         struct se_session *se_sess = cmd->se_sess;
3343         struct se_device *dev = cmd->se_dev;
3344         struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3345         struct se_lun *se_lun = cmd->se_lun;
3346         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3347         struct se_port *se_port;
3348         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3349         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3350         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3351         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3352         unsigned char *buf;
3353         unsigned char *initiator_str;
3354         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3355         u32 tid_len, tmp_tid_len;
3356         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3357         unsigned short rtpi;
3358         unsigned char proto_ident;
3359
3360         if (!se_sess || !se_lun) {
3361                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3362                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3363                 return -EINVAL;
3364         }
3365         memset(dest_iport, 0, 64);
3366         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3367         se_tpg = se_sess->se_tpg;
3368         tf_ops = se_tpg->se_tpg_tfo;
3369         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3370         /*
3371          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3372          *      Register behaviors for a REGISTER AND MOVE service action
3373          *
3374          * Locate the existing *pr_reg via struct se_node_acl pointers
3375          */
3376         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3377                                 se_sess);
3378         if (!pr_reg) {
3379                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3380                         " *pr_reg for REGISTER_AND_MOVE\n");
3381                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3382                 return -EINVAL;
3383         }
3384         /*
3385          * The provided reservation key much match the existing reservation key
3386          * provided during this initiator's I_T nexus registration.
3387          */
3388         if (res_key != pr_reg->pr_res_key) {
3389                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3390                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3391                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3392                 core_scsi3_put_pr_reg(pr_reg);
3393                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3394                 return -EINVAL;
3395         }
3396         /*
3397          * The service active reservation key needs to be non zero
3398          */
3399         if (!sa_res_key) {
3400                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3401                         " sa_res_key\n");
3402                 core_scsi3_put_pr_reg(pr_reg);
3403                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3404                 return -EINVAL;
3405         }
3406
3407         /*
3408          * Determine the Relative Target Port Identifier where the reservation
3409          * will be moved to for the TransportID containing SCSI initiator WWN
3410          * information.
3411          */
3412         buf = transport_kmap_data_sg(cmd);
3413         rtpi = (buf[18] & 0xff) << 8;
3414         rtpi |= buf[19] & 0xff;
3415         tid_len = (buf[20] & 0xff) << 24;
3416         tid_len |= (buf[21] & 0xff) << 16;
3417         tid_len |= (buf[22] & 0xff) << 8;
3418         tid_len |= buf[23] & 0xff;
3419         transport_kunmap_data_sg(cmd);
3420         buf = NULL;
3421
3422         if ((tid_len + 24) != cmd->data_length) {
3423                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3424                         " does not equal CDB data_length: %u\n", tid_len,
3425                         cmd->data_length);
3426                 core_scsi3_put_pr_reg(pr_reg);
3427                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3428                 return -EINVAL;
3429         }
3430
3431         spin_lock(&dev->se_port_lock);
3432         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3433                 if (se_port->sep_rtpi != rtpi)
3434                         continue;
3435                 dest_se_tpg = se_port->sep_tpg;
3436                 if (!dest_se_tpg)
3437                         continue;
3438                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3439                 if (!dest_tf_ops)
3440                         continue;
3441
3442                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3443                 smp_mb__after_atomic_inc();
3444                 spin_unlock(&dev->se_port_lock);
3445
3446                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3447                 if (ret != 0) {
3448                         pr_err("core_scsi3_tpg_depend_item() failed"
3449                                 " for dest_se_tpg\n");
3450                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3451                         smp_mb__after_atomic_dec();
3452                         core_scsi3_put_pr_reg(pr_reg);
3453                         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3454                         return -EINVAL;
3455                 }
3456
3457                 spin_lock(&dev->se_port_lock);
3458                 break;
3459         }
3460         spin_unlock(&dev->se_port_lock);
3461
3462         if (!dest_se_tpg || !dest_tf_ops) {
3463                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3464                         " fabric ops from Relative Target Port Identifier:"
3465                         " %hu\n", rtpi);
3466                 core_scsi3_put_pr_reg(pr_reg);
3467                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3468                 return -EINVAL;
3469         }
3470
3471         buf = transport_kmap_data_sg(cmd);
3472         proto_ident = (buf[24] & 0x0f);
3473 #if 0
3474         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3475                         " 0x%02x\n", proto_ident);
3476 #endif
3477         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3478                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3479                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3480                         " from fabric: %s\n", proto_ident,
3481                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3482                         dest_tf_ops->get_fabric_name());
3483                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3484                 ret = -EINVAL;
3485                 goto out;
3486         }
3487         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3488                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3489                         " containg a valid tpg_parse_pr_out_transport_id"
3490                         " function pointer\n");
3491                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3492                 ret = -EINVAL;
3493                 goto out;
3494         }
3495         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3496                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3497         if (!initiator_str) {
3498                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3499                         " initiator_str from Transport ID\n");
3500                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3501                 ret = -EINVAL;
3502                 goto out;
3503         }
3504
3505         transport_kunmap_data_sg(cmd);
3506         buf = NULL;
3507
3508         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3509                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3510                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3511                 iport_ptr : "");
3512         /*
3513          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3514          * action specifies a TransportID that is the same as the initiator port
3515          * of the I_T nexus for the command received, then the command shall
3516          * be terminated with CHECK CONDITION status, with the sense key set to
3517          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3518          * IN PARAMETER LIST.
3519          */
3520         pr_reg_nacl = pr_reg->pr_reg_nacl;
3521         matching_iname = (!strcmp(initiator_str,
3522                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3523         if (!matching_iname)
3524                 goto after_iport_check;
3525
3526         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3527                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3528                         " matches: %s on received I_T Nexus\n", initiator_str,
3529                         pr_reg_nacl->initiatorname);
3530                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3531                 ret = -EINVAL;
3532                 goto out;
3533         }
3534         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3535                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3536                         " matches: %s %s on received I_T Nexus\n",
3537                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3538                         pr_reg->pr_reg_isid);
3539                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3540                 ret = -EINVAL;
3541                 goto out;
3542         }
3543 after_iport_check:
3544         /*
3545          * Locate the destination struct se_node_acl from the received Transport ID
3546          */
3547         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3548         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3549                                 initiator_str);
3550         if (dest_node_acl) {
3551                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3552                 smp_mb__after_atomic_inc();
3553         }
3554         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3555
3556         if (!dest_node_acl) {
3557                 pr_err("Unable to locate %s dest_node_acl for"
3558                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3559                         initiator_str);
3560                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3561                 ret = -EINVAL;
3562                 goto out;
3563         }
3564         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3565         if (ret != 0) {
3566                 pr_err("core_scsi3_nodeacl_depend_item() for"
3567                         " dest_node_acl\n");
3568                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3569                 smp_mb__after_atomic_dec();
3570                 dest_node_acl = NULL;
3571                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3572                 ret = -EINVAL;
3573                 goto out;
3574         }
3575 #if 0
3576         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3577                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3578                 dest_node_acl->initiatorname);
3579 #endif
3580         /*
3581          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3582          * PORT IDENTIFIER.
3583          */
3584         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3585         if (!dest_se_deve) {
3586                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3587                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3588                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3589                 ret = -EINVAL;
3590                 goto out;
3591         }
3592
3593         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3594         if (ret < 0) {
3595                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3596                 atomic_dec(&dest_se_deve->pr_ref_count);
3597                 smp_mb__after_atomic_dec();
3598                 dest_se_deve = NULL;
3599                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3600                 ret = -EINVAL;
3601                 goto out;
3602         }
3603 #if 0
3604         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3605                 " ACL for dest_se_deve->mapped_lun: %u\n",
3606                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3607                 dest_se_deve->mapped_lun);
3608 #endif
3609         /*
3610          * A persistent reservation needs to already existing in order to
3611          * successfully complete the REGISTER_AND_MOVE service action..
3612          */
3613         spin_lock(&dev->dev_reservation_lock);
3614         pr_res_holder = dev->dev_pr_res_holder;
3615         if (!pr_res_holder) {
3616                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3617                         " currently held\n");
3618                 spin_unlock(&dev->dev_reservation_lock);
3619                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3620                 ret = -EINVAL;
3621                 goto out;
3622         }
3623         /*
3624          * The received on I_T Nexus must be the reservation holder.
3625          *
3626          * From spc4r17 section 5.7.8  Table 50 --
3627          *      Register behaviors for a REGISTER AND MOVE service action
3628          */
3629         if (pr_res_holder != pr_reg) {
3630                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3631                         " Nexus is not reservation holder\n");
3632                 spin_unlock(&dev->dev_reservation_lock);
3633                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3634                 ret = -EINVAL;
3635                 goto out;
3636         }
3637         /*
3638          * From spc4r17 section 5.7.8: registering and moving reservation
3639          *
3640          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3641          * action is received and the established persistent reservation is a
3642          * Write Exclusive - All Registrants type or Exclusive Access -
3643          * All Registrants type reservation, then the command shall be completed
3644          * with RESERVATION CONFLICT status.
3645          */
3646         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3647             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3648                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3649                         " reservation for type: %s\n",
3650                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3651                 spin_unlock(&dev->dev_reservation_lock);
3652                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3653                 ret = -EINVAL;
3654                 goto out;
3655         }
3656         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3657         /*
3658          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3659          */
3660         type = pr_res_holder->pr_res_type;
3661         scope = pr_res_holder->pr_res_type;
3662         /*
3663          * c) Associate the reservation key specified in the SERVICE ACTION
3664          *    RESERVATION KEY field with the I_T nexus specified as the
3665          *    destination of the register and move, where:
3666          *    A) The I_T nexus is specified by the TransportID and the
3667          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3668          *    B) Regardless of the TransportID format used, the association for
3669          *       the initiator port is based on either the initiator port name
3670          *       (see 3.1.71) on SCSI transport protocols where port names are
3671          *       required or the initiator port identifier (see 3.1.70) on SCSI
3672          *       transport protocols where port names are not required;
3673          * d) Register the reservation key specified in the SERVICE ACTION
3674          *    RESERVATION KEY field;
3675          * e) Retain the reservation key specified in the SERVICE ACTION
3676          *    RESERVATION KEY field and associated information;
3677          *
3678          * Also, It is not an error for a REGISTER AND MOVE service action to
3679          * register an I_T nexus that is already registered with the same
3680          * reservation key or a different reservation key.
3681          */
3682         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3683                                         iport_ptr);
3684         if (!dest_pr_reg) {
3685                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3686                                 dest_node_acl, dest_se_deve, iport_ptr,
3687                                 sa_res_key, 0, aptpl, 2, 1);
3688                 if (ret != 0) {
3689                         spin_unlock(&dev->dev_reservation_lock);
3690                         cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3691                         ret = -EINVAL;
3692                         goto out;
3693                 }
3694                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3695                                                 iport_ptr);
3696                 new_reg = 1;
3697         }
3698         /*
3699          * f) Release the persistent reservation for the persistent reservation
3700          *    holder (i.e., the I_T nexus on which the
3701          */
3702         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3703                         dev->dev_pr_res_holder, 0);
3704         /*
3705          * g) Move the persistent reservation to the specified I_T nexus using
3706          *    the same scope and type as the persistent reservation released in
3707          *    item f); and
3708          */
3709         dev->dev_pr_res_holder = dest_pr_reg;
3710         dest_pr_reg->pr_res_holder = 1;
3711         dest_pr_reg->pr_res_type = type;
3712         pr_reg->pr_res_scope = scope;
3713         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3714                                 PR_REG_ISID_ID_LEN);
3715         /*
3716          * Increment PRGeneration for existing registrations..
3717          */
3718         if (!new_reg)
3719                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3720         spin_unlock(&dev->dev_reservation_lock);
3721
3722         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3723                 " created new reservation holder TYPE: %s on object RTPI:"
3724                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3725                 core_scsi3_pr_dump_type(type), rtpi,
3726                 dest_pr_reg->pr_res_generation);
3727         pr_debug("SPC-3 PR Successfully moved reservation from"
3728                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3729                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3730                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3731                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3732                 iport_ptr : "");
3733         /*
3734          * It is now safe to release configfs group dependencies for destination
3735          * of Transport ID Initiator Device/Port Identifier
3736          */
3737         core_scsi3_lunacl_undepend_item(dest_se_deve);
3738         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3739         core_scsi3_tpg_undepend_item(dest_se_tpg);
3740         /*
3741          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3742          * nexus on which PERSISTENT RESERVE OUT command was received.
3743          */
3744         if (unreg) {
3745                 spin_lock(&pr_tmpl->registration_lock);
3746                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3747                 spin_unlock(&pr_tmpl->registration_lock);
3748         } else
3749                 core_scsi3_put_pr_reg(pr_reg);
3750
3751         /*
3752          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3753          * write out the updated metadata to struct file for this SCSI device.
3754          */
3755         if (!aptpl) {
3756                 pr_tmpl->pr_aptpl_active = 0;
3757                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3758                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3759                                 " REGISTER_AND_MOVE\n");
3760         } else {
3761                 pr_tmpl->pr_aptpl_active = 1;
3762                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3763                                 &dest_pr_reg->pr_aptpl_buf[0],
3764                                 pr_tmpl->pr_aptpl_buf_len);
3765                 if (!ret)
3766                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3767                                         " REGISTER_AND_MOVE\n");
3768         }
3769
3770         transport_kunmap_data_sg(cmd);
3771
3772         core_scsi3_put_pr_reg(dest_pr_reg);
3773         return 0;
3774 out:
3775         if (buf)
3776                 transport_kunmap_data_sg(cmd);
3777         if (dest_se_deve)
3778                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3779         if (dest_node_acl)
3780                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3781         core_scsi3_tpg_undepend_item(dest_se_tpg);
3782         core_scsi3_put_pr_reg(pr_reg);
3783         return ret;
3784 }
3785
3786 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3787 {
3788         unsigned int __v1, __v2;
3789
3790         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3791         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3792
3793         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3794 }
3795
3796 /*
3797  * See spc4r17 section 6.14 Table 170
3798  */
3799 int target_scsi3_emulate_pr_out(struct se_task *task)
3800 {
3801         struct se_cmd *cmd = task->task_se_cmd;
3802         unsigned char *cdb = &cmd->t_task_cdb[0];
3803         unsigned char *buf;
3804         u64 res_key, sa_res_key;
3805         int sa, scope, type, aptpl;
3806         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3807         int ret;
3808
3809         /*
3810          * Following spc2r20 5.5.1 Reservations overview:
3811          *
3812          * If a logical unit has been reserved by any RESERVE command and is
3813          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3814          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3815          * initiator or service action and shall terminate with a RESERVATION
3816          * CONFLICT status.
3817          */
3818         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
3819                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3820                         " SPC-2 reservation is held, returning"
3821                         " RESERVATION_CONFLICT\n");
3822                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
3823                 ret = EINVAL;
3824                 goto out;
3825         }
3826
3827         /*
3828          * FIXME: A NULL struct se_session pointer means an this is not coming from
3829          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3830          */
3831         if (!cmd->se_sess) {
3832                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3833                 return -EINVAL;
3834         }
3835
3836         if (cmd->data_length < 24) {
3837                 pr_warn("SPC-PR: Received PR OUT parameter list"
3838                         " length too small: %u\n", cmd->data_length);
3839                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3840                 ret = -EINVAL;
3841                 goto out;
3842         }
3843         /*
3844          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3845          */
3846         sa = (cdb[1] & 0x1f);
3847         scope = (cdb[2] & 0xf0);
3848         type = (cdb[2] & 0x0f);
3849
3850         buf = transport_kmap_data_sg(cmd);
3851         /*
3852          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3853          */
3854         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3855         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3856         /*
3857          * REGISTER_AND_MOVE uses a different SA parameter list containing
3858          * SCSI TransportIDs.
3859          */
3860         if (sa != PRO_REGISTER_AND_MOVE) {
3861                 spec_i_pt = (buf[20] & 0x08);
3862                 all_tg_pt = (buf[20] & 0x04);
3863                 aptpl = (buf[20] & 0x01);
3864         } else {
3865                 aptpl = (buf[17] & 0x01);
3866                 unreg = (buf[17] & 0x02);
3867         }
3868         transport_kunmap_data_sg(cmd);
3869         buf = NULL;
3870
3871         /*
3872          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3873          */
3874         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
3875                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3876                 ret = -EINVAL;
3877                 goto out;
3878         }
3879
3880         /*
3881          * From spc4r17 section 6.14:
3882          *
3883          * If the SPEC_I_PT bit is set to zero, the service action is not
3884          * REGISTER AND MOVE, and the parameter list length is not 24, then
3885          * the command shall be terminated with CHECK CONDITION status, with
3886          * the sense key set to ILLEGAL REQUEST, and the additional sense
3887          * code set to PARAMETER LIST LENGTH ERROR.
3888          */
3889         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3890             (cmd->data_length != 24)) {
3891                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3892                         " list length: %u\n", cmd->data_length);
3893                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
3894                 ret = -EINVAL;
3895                 goto out;
3896         }
3897         /*
3898          * (core_scsi3_emulate_pro_* function parameters
3899          * are defined by spc4r17 Table 174:
3900          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3901          */
3902         switch (sa) {
3903         case PRO_REGISTER:
3904                 ret = core_scsi3_emulate_pro_register(cmd,
3905                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3906                 break;
3907         case PRO_RESERVE:
3908                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3909                 break;
3910         case PRO_RELEASE:
3911                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3912                 break;
3913         case PRO_CLEAR:
3914                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3915                 break;
3916         case PRO_PREEMPT:
3917                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3918                                         res_key, sa_res_key, 0);
3919                 break;
3920         case PRO_PREEMPT_AND_ABORT:
3921                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3922                                         res_key, sa_res_key, 1);
3923                 break;
3924         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3925                 ret = core_scsi3_emulate_pro_register(cmd,
3926                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3927                 break;
3928         case PRO_REGISTER_AND_MOVE:
3929                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3930                                 sa_res_key, aptpl, unreg);
3931                 break;
3932         default:
3933                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3934                         " action: 0x%02x\n", cdb[1] & 0x1f);
3935                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3936                 ret = -EINVAL;
3937                 break;
3938         }
3939
3940 out:
3941         if (!ret) {
3942                 task->task_scsi_status = GOOD;
3943                 transport_complete_task(task, 1);
3944         }
3945         return ret;
3946 }
3947
3948 /*
3949  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3950  *
3951  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3952  */
3953 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3954 {
3955         struct se_device *se_dev = cmd->se_dev;
3956         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3957         struct t10_pr_registration *pr_reg;
3958         unsigned char *buf;
3959         u32 add_len = 0, off = 8;
3960
3961         if (cmd->data_length < 8) {
3962                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3963                         " too small\n", cmd->data_length);
3964                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3965                 return -EINVAL;
3966         }
3967
3968         buf = transport_kmap_data_sg(cmd);
3969         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3970         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3971         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3972         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3973
3974         spin_lock(&su_dev->t10_pr.registration_lock);
3975         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3976                         pr_reg_list) {
3977                 /*
3978                  * Check for overflow of 8byte PRI READ_KEYS payload and
3979                  * next reservation key list descriptor.
3980                  */
3981                 if ((add_len + 8) > (cmd->data_length - 8))
3982                         break;
3983
3984                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3985                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3986                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3987                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3988                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3989                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3990                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3991                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3992
3993                 add_len += 8;
3994         }
3995         spin_unlock(&su_dev->t10_pr.registration_lock);
3996
3997         buf[4] = ((add_len >> 24) & 0xff);
3998         buf[5] = ((add_len >> 16) & 0xff);
3999         buf[6] = ((add_len >> 8) & 0xff);
4000         buf[7] = (add_len & 0xff);
4001
4002         transport_kunmap_data_sg(cmd);
4003
4004         return 0;
4005 }
4006
4007 /*
4008  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
4009  *
4010  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
4011  */
4012 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
4013 {
4014         struct se_device *se_dev = cmd->se_dev;
4015         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4016         struct t10_pr_registration *pr_reg;
4017         unsigned char *buf;
4018         u64 pr_res_key;
4019         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
4020
4021         if (cmd->data_length < 8) {
4022                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
4023                         " too small\n", cmd->data_length);
4024                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4025                 return -EINVAL;
4026         }
4027
4028         buf = transport_kmap_data_sg(cmd);
4029         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4030         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4031         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4032         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4033
4034         spin_lock(&se_dev->dev_reservation_lock);
4035         pr_reg = se_dev->dev_pr_res_holder;
4036         if ((pr_reg)) {
4037                 /*
4038                  * Set the hardcoded Additional Length
4039                  */
4040                 buf[4] = ((add_len >> 24) & 0xff);
4041                 buf[5] = ((add_len >> 16) & 0xff);
4042                 buf[6] = ((add_len >> 8) & 0xff);
4043                 buf[7] = (add_len & 0xff);
4044
4045                 if (cmd->data_length < 22)
4046                         goto err;
4047
4048                 /*
4049                  * Set the Reservation key.
4050                  *
4051                  * From spc4r17, section 5.7.10:
4052                  * A persistent reservation holder has its reservation key
4053                  * returned in the parameter data from a PERSISTENT
4054                  * RESERVE IN command with READ RESERVATION service action as
4055                  * follows:
4056                  * a) For a persistent reservation of the type Write Exclusive
4057                  *    - All Registrants or Exclusive Access  All Regitrants,
4058                  *      the reservation key shall be set to zero; or
4059                  * b) For all other persistent reservation types, the
4060                  *    reservation key shall be set to the registered
4061                  *    reservation key for the I_T nexus that holds the
4062                  *    persistent reservation.
4063                  */
4064                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
4065                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
4066                         pr_res_key = 0;
4067                 else
4068                         pr_res_key = pr_reg->pr_res_key;
4069
4070                 buf[8] = ((pr_res_key >> 56) & 0xff);
4071                 buf[9] = ((pr_res_key >> 48) & 0xff);
4072                 buf[10] = ((pr_res_key >> 40) & 0xff);
4073                 buf[11] = ((pr_res_key >> 32) & 0xff);
4074                 buf[12] = ((pr_res_key >> 24) & 0xff);
4075                 buf[13] = ((pr_res_key >> 16) & 0xff);
4076                 buf[14] = ((pr_res_key >> 8) & 0xff);
4077                 buf[15] = (pr_res_key & 0xff);
4078                 /*
4079                  * Set the SCOPE and TYPE
4080                  */
4081                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
4082                           (pr_reg->pr_res_type & 0x0f);
4083         }
4084
4085 err:
4086         spin_unlock(&se_dev->dev_reservation_lock);
4087         transport_kunmap_data_sg(cmd);
4088
4089         return 0;
4090 }
4091
4092 /*
4093  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
4094  *
4095  * See spc4r17 section 6.13.4 Table 165
4096  */
4097 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
4098 {
4099         struct se_device *dev = cmd->se_dev;
4100         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
4101         unsigned char *buf;
4102         u16 add_len = 8; /* Hardcoded to 8. */
4103
4104         if (cmd->data_length < 6) {
4105                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4106                         " %u too small\n", cmd->data_length);
4107                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4108                 return -EINVAL;
4109         }
4110
4111         buf = transport_kmap_data_sg(cmd);
4112
4113         buf[0] = ((add_len << 8) & 0xff);
4114         buf[1] = (add_len & 0xff);
4115         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4116         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4117         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4118         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4119         /*
4120          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4121          * set the TMV: Task Mask Valid bit.
4122          */
4123         buf[3] |= 0x80;
4124         /*
4125          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4126          */
4127         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4128         /*
4129          * PTPL_A: Persistence across Target Power Loss Active bit
4130          */
4131         if (pr_tmpl->pr_aptpl_active)
4132                 buf[3] |= 0x01;
4133         /*
4134          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4135          */
4136         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4137         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4138         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4139         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4140         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4141         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4142
4143         transport_kunmap_data_sg(cmd);
4144
4145         return 0;
4146 }
4147
4148 /*
4149  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4150  *
4151  * See spc4r17 section 6.13.5 Table 168 and 169
4152  */
4153 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4154 {
4155         struct se_device *se_dev = cmd->se_dev;
4156         struct se_node_acl *se_nacl;
4157         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4158         struct se_portal_group *se_tpg;
4159         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4160         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4161         unsigned char *buf;
4162         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4163         u32 off = 8; /* off into first Full Status descriptor */
4164         int format_code = 0;
4165
4166         if (cmd->data_length < 8) {
4167                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4168                         " too small\n", cmd->data_length);
4169                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4170                 return -EINVAL;
4171         }
4172
4173         buf = transport_kmap_data_sg(cmd);
4174
4175         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4176         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4177         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4178         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4179
4180         spin_lock(&pr_tmpl->registration_lock);
4181         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4182                         &pr_tmpl->registration_list, pr_reg_list) {
4183
4184                 se_nacl = pr_reg->pr_reg_nacl;
4185                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4186                 add_desc_len = 0;
4187
4188                 atomic_inc(&pr_reg->pr_res_holders);
4189                 smp_mb__after_atomic_inc();
4190                 spin_unlock(&pr_tmpl->registration_lock);
4191                 /*
4192                  * Determine expected length of $FABRIC_MOD specific
4193                  * TransportID full status descriptor..
4194                  */
4195                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4196                                 se_tpg, se_nacl, pr_reg, &format_code);
4197
4198                 if ((exp_desc_len + add_len) > cmd->data_length) {
4199                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4200                                 " out of buffer: %d\n", cmd->data_length);
4201                         spin_lock(&pr_tmpl->registration_lock);
4202                         atomic_dec(&pr_reg->pr_res_holders);
4203                         smp_mb__after_atomic_dec();
4204                         break;
4205                 }
4206                 /*
4207                  * Set RESERVATION KEY
4208                  */
4209                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4210                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4211                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4212                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4213                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4214                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4215                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4216                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4217                 off += 4; /* Skip Over Reserved area */
4218
4219                 /*
4220                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4221                  */
4222                 if (pr_reg->pr_reg_all_tg_pt)
4223                         buf[off] = 0x02;
4224                 /*
4225                  * The struct se_lun pointer will be present for the
4226                  * reservation holder for PR_HOLDER bit.
4227                  *
4228                  * Also, if this registration is the reservation
4229                  * holder, fill in SCOPE and TYPE in the next byte.
4230                  */
4231                 if (pr_reg->pr_res_holder) {
4232                         buf[off++] |= 0x01;
4233                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4234                                      (pr_reg->pr_res_type & 0x0f);
4235                 } else
4236                         off += 2;
4237
4238                 off += 4; /* Skip over reserved area */
4239                 /*
4240                  * From spc4r17 6.3.15:
4241                  *
4242                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4243                  * IDENTIFIER field contains the relative port identifier (see
4244                  * 3.1.120) of the target port that is part of the I_T nexus
4245                  * described by this full status descriptor. If the ALL_TG_PT
4246                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4247                  * IDENTIFIER field are not defined by this standard.
4248                  */
4249                 if (!pr_reg->pr_reg_all_tg_pt) {
4250                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4251
4252                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4253                         buf[off++] = (port->sep_rtpi & 0xff);
4254                 } else
4255                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4256
4257                 /*
4258                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4259                  */
4260                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4261                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4262
4263                 spin_lock(&pr_tmpl->registration_lock);
4264                 atomic_dec(&pr_reg->pr_res_holders);
4265                 smp_mb__after_atomic_dec();
4266                 /*
4267                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4268                  */
4269                 buf[off++] = ((desc_len >> 24) & 0xff);
4270                 buf[off++] = ((desc_len >> 16) & 0xff);
4271                 buf[off++] = ((desc_len >> 8) & 0xff);
4272                 buf[off++] = (desc_len & 0xff);
4273                 /*
4274                  * Size of full desctipor header minus TransportID
4275                  * containing $FABRIC_MOD specific) initiator device/port
4276                  * WWN information.
4277                  *
4278                  *  See spc4r17 Section 6.13.5 Table 169
4279                  */
4280                 add_desc_len = (24 + desc_len);
4281
4282                 off += desc_len;
4283                 add_len += add_desc_len;
4284         }
4285         spin_unlock(&pr_tmpl->registration_lock);
4286         /*
4287          * Set ADDITIONAL_LENGTH
4288          */
4289         buf[4] = ((add_len >> 24) & 0xff);
4290         buf[5] = ((add_len >> 16) & 0xff);
4291         buf[6] = ((add_len >> 8) & 0xff);
4292         buf[7] = (add_len & 0xff);
4293
4294         transport_kunmap_data_sg(cmd);
4295
4296         return 0;
4297 }
4298
4299 int target_scsi3_emulate_pr_in(struct se_task *task)
4300 {
4301         struct se_cmd *cmd = task->task_se_cmd;
4302         int ret;
4303
4304         /*
4305          * Following spc2r20 5.5.1 Reservations overview:
4306          *
4307          * If a logical unit has been reserved by any RESERVE command and is
4308          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4309          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4310          * initiator or service action and shall terminate with a RESERVATION
4311          * CONFLICT status.
4312          */
4313         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
4314                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4315                         " SPC-2 reservation is held, returning"
4316                         " RESERVATION_CONFLICT\n");
4317                 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
4318                 return -EINVAL;
4319         }
4320
4321         switch (cmd->t_task_cdb[1] & 0x1f) {
4322         case PRI_READ_KEYS:
4323                 ret = core_scsi3_pri_read_keys(cmd);
4324                 break;
4325         case PRI_READ_RESERVATION:
4326                 ret = core_scsi3_pri_read_reservation(cmd);
4327                 break;
4328         case PRI_REPORT_CAPABILITIES:
4329                 ret = core_scsi3_pri_report_capabilities(cmd);
4330                 break;
4331         case PRI_READ_FULL_STATUS:
4332                 ret = core_scsi3_pri_read_full_status(cmd);
4333                 break;
4334         default:
4335                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4336                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4337                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
4338                 ret = -EINVAL;
4339                 break;
4340         }
4341
4342         if (!ret) {
4343                 task->task_scsi_status = GOOD;
4344                 transport_complete_task(task, 1);
4345         }
4346         return ret;
4347 }
4348
4349 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4350 {
4351         return 0;
4352 }
4353
4354 static int core_pt_seq_non_holder(
4355         struct se_cmd *cmd,
4356         unsigned char *cdb,
4357         u32 pr_reg_type)
4358 {
4359         return 0;
4360 }
4361
4362 int core_setup_reservations(struct se_device *dev, int force_pt)
4363 {
4364         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4365         struct t10_reservation *rest = &su_dev->t10_pr;
4366         /*
4367          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4368          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4369          * cause a problem because libata and some SATA RAID HBAs appear
4370          * under Linux/SCSI, but to emulate reservations themselves.
4371          */
4372         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4373             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4374                 rest->res_type = SPC_PASSTHROUGH;
4375                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4376                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4377                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4378                         " emulation\n", dev->transport->name);
4379                 return 0;
4380         }
4381         /*
4382          * If SPC-3 or above is reported by real or emulated struct se_device,
4383          * use emulated Persistent Reservations.
4384          */
4385         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4386                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4387                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4388                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4389                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4390                         " emulation\n", dev->transport->name);
4391         } else {
4392                 rest->res_type = SPC2_RESERVATIONS;
4393                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4394                 rest->pr_ops.t10_seq_non_holder =
4395                                 &core_scsi2_reservation_seq_non_holder;
4396                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4397                         dev->transport->name);
4398         }
4399
4400         return 0;
4401 }