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