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  * (c) Copyright 2009-2012 RisingTide Systems LLC.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/file.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 sense_reason_t
  72 target_scsi2_reservation_check(struct se_cmd *cmd)
  73 {
  74         struct se_device *dev = cmd->se_dev;
  75         struct se_session *sess = cmd->se_sess;
  76
  77         switch (cmd->t_task_cdb[0]) {
  78         case INQUIRY:
  79         case RELEASE:
  80         case RELEASE_10:
  81                 return 0;
  82         default:
  83                 break;
  84         }
  85
  86         if (!dev->dev_reserved_node_acl || !sess)
  87                 return 0;
  88
  89         if (dev->dev_reserved_node_acl != sess->se_node_acl)
  90                 return TCM_RESERVATION_CONFLICT;
  91
  92         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
  93                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
  94                         return TCM_RESERVATION_CONFLICT;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 101                                         struct se_node_acl *, struct se_session *);
 102 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 103
 104 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 105 {
 106         struct se_session *se_sess = cmd->se_sess;
 107         struct se_device *dev = cmd->se_dev;
 108         struct t10_pr_registration *pr_reg;
 109         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 110         int conflict = 0;
 111
 112         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 113                         se_sess);
 114         if (pr_reg) {
 115                 /*
 116                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 117                  * behavior
 118                  *
 119                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 120                  * status, but no reservation shall be established and the
 121                  * persistent reservation shall not be changed, if the command
 122                  * is received from a) and b) below.
 123                  *
 124                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 125                  * status, but the persistent reservation shall not be released,
 126                  * if the command is received from a) and b)
 127                  *
 128                  * a) An I_T nexus that is a persistent reservation holder; or
 129                  * b) An I_T nexus that is registered if a registrants only or
 130                  *    all registrants type persistent reservation is present.
 131                  *
 132                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 133                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 134                  * as defined in SPC-2.
 135                  */
 136                 if (pr_reg->pr_res_holder) {
 137                         core_scsi3_put_pr_reg(pr_reg);
 138                         return 1;
 139                 }
 140                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 141                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 142                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 143                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 144                         core_scsi3_put_pr_reg(pr_reg);
 145                         return 1;
 146                 }
 147                 core_scsi3_put_pr_reg(pr_reg);
 148                 conflict = 1;
 149         } else {
 150                 /*
 151                  * Following spc2r20 5.5.1 Reservations overview:
 152                  *
 153                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 154                  * command with the REGISTER or the REGISTER AND IGNORE
 155                  * EXISTING KEY service action and is still registered by any
 156                  * initiator, all RESERVE commands and all RELEASE commands
 157                  * regardless of initiator shall conflict and shall terminate
 158                  * with a RESERVATION CONFLICT status.
 159                  */
 160                 spin_lock(&pr_tmpl->registration_lock);
 161                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 162                 spin_unlock(&pr_tmpl->registration_lock);
 163         }
 164
 165         if (conflict) {
 166                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 167                         " while active SPC-3 registrations exist,"
 168                         " returning RESERVATION_CONFLICT\n");
 169                 return -EBUSY;
 170         }
 171
 172         return 0;
 173 }
 174
 175 sense_reason_t
 176 target_scsi2_reservation_release(struct se_cmd *cmd)
 177 {
 178         struct se_device *dev = cmd->se_dev;
 179         struct se_session *sess = cmd->se_sess;
 180         struct se_portal_group *tpg;
 181         int rc;
 182
 183         if (!sess || !sess->se_tpg)
 184                 goto out;
 185         rc = target_check_scsi2_reservation_conflict(cmd);
 186         if (rc == 1)
 187                 goto out;
 188         if (rc < 0)
 189                 return TCM_RESERVATION_CONFLICT;
 190
 191         spin_lock(&dev->dev_reservation_lock);
 192         if (!dev->dev_reserved_node_acl || !sess)
 193                 goto out_unlock;
 194
 195         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 196                 goto out_unlock;
 197
 198         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 199                 goto out_unlock;
 200
 201         dev->dev_reserved_node_acl = NULL;
 202         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 203         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 204                 dev->dev_res_bin_isid = 0;
 205                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 206         }
 207         tpg = sess->se_tpg;
 208         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 209                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 210                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 211                 sess->se_node_acl->initiatorname);
 212
 213 out_unlock:
 214         spin_unlock(&dev->dev_reservation_lock);
 215 out:
 216         target_complete_cmd(cmd, GOOD);
 217         return 0;
 218 }
 219
 220 sense_reason_t
 221 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 222 {
 223         struct se_device *dev = cmd->se_dev;
 224         struct se_session *sess = cmd->se_sess;
 225         struct se_portal_group *tpg;
 226         sense_reason_t ret = 0;
 227         int rc;
 228
 229         if ((cmd->t_task_cdb[1] & 0x01) &&
 230             (cmd->t_task_cdb[1] & 0x02)) {
 231                 pr_err("LongIO and Obselete Bits set, returning"
 232                                 " ILLEGAL_REQUEST\n");
 233                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 234         }
 235         /*
 236          * This is currently the case for target_core_mod passthrough struct se_cmd
 237          * ops
 238          */
 239         if (!sess || !sess->se_tpg)
 240                 goto out;
 241         rc = target_check_scsi2_reservation_conflict(cmd);
 242         if (rc == 1)
 243                 goto out;
 244
 245         if (rc < 0)
 246                 return TCM_RESERVATION_CONFLICT;
 247
 248         tpg = sess->se_tpg;
 249         spin_lock(&dev->dev_reservation_lock);
 250         if (dev->dev_reserved_node_acl &&
 251            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 252                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 253                         tpg->se_tpg_tfo->get_fabric_name());
 254                 pr_err("Original reserver LUN: %u %s\n",
 255                         cmd->se_lun->unpacked_lun,
 256                         dev->dev_reserved_node_acl->initiatorname);
 257                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 258                         " from %s \n", cmd->se_lun->unpacked_lun,
 259                         cmd->se_deve->mapped_lun,
 260                         sess->se_node_acl->initiatorname);
 261                 ret = TCM_RESERVATION_CONFLICT;
 262                 goto out_unlock;
 263         }
 264
 265         dev->dev_reserved_node_acl = sess->se_node_acl;
 266         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 267         if (sess->sess_bin_isid != 0) {
 268                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 269                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 270         }
 271         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 272                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 273                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 274                 sess->se_node_acl->initiatorname);
 275
 276 out_unlock:
 277         spin_unlock(&dev->dev_reservation_lock);
 278 out:
 279         if (!ret)
 280                 target_complete_cmd(cmd, GOOD);
 281         return ret;
 282 }
 283
 284
 285 /*
 286  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 287  *
 288  * This function is called by those initiator ports who are *NOT*
 289  * the active PR reservation holder when a reservation is present.
 290  */
 291 static int core_scsi3_pr_seq_non_holder(
 292         struct se_cmd *cmd,
 293         u32 pr_reg_type)
 294 {
 295         unsigned char *cdb = cmd->t_task_cdb;
 296         struct se_dev_entry *se_deve;
 297         struct se_session *se_sess = cmd->se_sess;
 298         int other_cdb = 0, ignore_reg;
 299         int registered_nexus = 0, ret = 1; /* Conflict by default */
 300         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 301         int we = 0; /* Write Exclusive */
 302         int legacy = 0; /* Act like a legacy device and return
 303                          * RESERVATION CONFLICT on some CDBs */
 304
 305         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 306         /*
 307          * Determine if the registration should be ignored due to
 308          * non-matching ISIDs in target_scsi3_pr_reservation_check().
 309          */
 310         ignore_reg = (pr_reg_type & 0x80000000);
 311         if (ignore_reg)
 312                 pr_reg_type &= ~0x80000000;
 313
 314         switch (pr_reg_type) {
 315         case PR_TYPE_WRITE_EXCLUSIVE:
 316                 we = 1;
 317         case PR_TYPE_EXCLUSIVE_ACCESS:
 318                 /*
 319                  * Some commands are only allowed for the persistent reservation
 320                  * holder.
 321                  */
 322                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 323                         registered_nexus = 1;
 324                 break;
 325         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 326                 we = 1;
 327         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 328                 /*
 329                  * Some commands are only allowed for registered I_T Nexuses.
 330                  */
 331                 reg_only = 1;
 332                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 333                         registered_nexus = 1;
 334                 break;
 335         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 336                 we = 1;
 337         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 338                 /*
 339                  * Each registered I_T Nexus is a reservation holder.
 340                  */
 341                 all_reg = 1;
 342                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 343                         registered_nexus = 1;
 344                 break;
 345         default:
 346                 return -EINVAL;
 347         }
 348         /*
 349          * Referenced from spc4r17 table 45 for *NON* PR holder access
 350          */
 351         switch (cdb[0]) {
 352         case SECURITY_PROTOCOL_IN:
 353                 if (registered_nexus)
 354                         return 0;
 355                 ret = (we) ? 0 : 1;
 356                 break;
 357         case MODE_SENSE:
 358         case MODE_SENSE_10:
 359         case READ_ATTRIBUTE:
 360         case READ_BUFFER:
 361         case RECEIVE_DIAGNOSTIC:
 362                 if (legacy) {
 363                         ret = 1;
 364                         break;
 365                 }
 366                 if (registered_nexus) {
 367                         ret = 0;
 368                         break;
 369                 }
 370                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 371                 break;
 372         case PERSISTENT_RESERVE_OUT:
 373                 /*
 374                  * This follows PERSISTENT_RESERVE_OUT service actions that
 375                  * are allowed in the presence of various reservations.
 376                  * See spc4r17, table 46
 377                  */
 378                 switch (cdb[1] & 0x1f) {
 379                 case PRO_CLEAR:
 380                 case PRO_PREEMPT:
 381                 case PRO_PREEMPT_AND_ABORT:
 382                         ret = (registered_nexus) ? 0 : 1;
 383                         break;
 384                 case PRO_REGISTER:
 385                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 386                         ret = 0;
 387                         break;
 388                 case PRO_REGISTER_AND_MOVE:
 389                 case PRO_RESERVE:
 390                         ret = 1;
 391                         break;
 392                 case PRO_RELEASE:
 393                         ret = (registered_nexus) ? 0 : 1;
 394                         break;
 395                 default:
 396                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 397                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 398                         return -EINVAL;
 399                 }
 400                 break;
 401         case RELEASE:
 402         case RELEASE_10:
 403                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 404                 ret = 0;
 405                 break;
 406         case RESERVE:
 407         case RESERVE_10:
 408                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 409                 ret = 0;
 410                 break;
 411         case TEST_UNIT_READY:
 412                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 413                 break;
 414         case MAINTENANCE_IN:
 415                 switch (cdb[1] & 0x1f) {
 416                 case MI_MANAGEMENT_PROTOCOL_IN:
 417                         if (registered_nexus) {
 418                                 ret = 0;
 419                                 break;
 420                         }
 421                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 422                         break;
 423                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 424                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 425                         if (legacy) {
 426                                 ret = 1;
 427                                 break;
 428                         }
 429                         if (registered_nexus) {
 430                                 ret = 0;
 431                                 break;
 432                         }
 433                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 434                         break;
 435                 case MI_REPORT_ALIASES:
 436                 case MI_REPORT_IDENTIFYING_INFORMATION:
 437                 case MI_REPORT_PRIORITY:
 438                 case MI_REPORT_TARGET_PGS:
 439                 case MI_REPORT_TIMESTAMP:
 440                         ret = 0; /* Allowed */
 441                         break;
 442                 default:
 443                         pr_err("Unknown MI Service Action: 0x%02x\n",
 444                                 (cdb[1] & 0x1f));
 445                         return -EINVAL;
 446                 }
 447                 break;
 448         case ACCESS_CONTROL_IN:
 449         case ACCESS_CONTROL_OUT:
 450         case INQUIRY:
 451         case LOG_SENSE:
 452         case READ_MEDIA_SERIAL_NUMBER:
 453         case REPORT_LUNS:
 454         case REQUEST_SENSE:
 455         case PERSISTENT_RESERVE_IN:
 456                 ret = 0; /*/ Allowed CDBs */
 457                 break;
 458         default:
 459                 other_cdb = 1;
 460                 break;
 461         }
 462         /*
 463          * Case where the CDB is explicitly allowed in the above switch
 464          * statement.
 465          */
 466         if (!ret && !other_cdb) {
 467                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 468                         " reservation holder\n", cdb[0],
 469                         core_scsi3_pr_dump_type(pr_reg_type));
 470
 471                 return ret;
 472         }
 473         /*
 474          * Check if write exclusive initiator ports *NOT* holding the
 475          * WRITE_EXCLUSIVE_* reservation.
 476          */
 477         if (we && !registered_nexus) {
 478                 if (cmd->data_direction == DMA_TO_DEVICE) {
 479                         /*
 480                          * Conflict for write exclusive
 481                          */
 482                         pr_debug("%s Conflict for unregistered nexus"
 483                                 " %s CDB: 0x%02x to %s reservation\n",
 484                                 transport_dump_cmd_direction(cmd),
 485                                 se_sess->se_node_acl->initiatorname, cdb[0],
 486                                 core_scsi3_pr_dump_type(pr_reg_type));
 487                         return 1;
 488                 } else {
 489                         /*
 490                          * Allow non WRITE CDBs for all Write Exclusive
 491                          * PR TYPEs to pass for registered and
 492                          * non-registered_nexuxes NOT holding the reservation.
 493                          *
 494                          * We only make noise for the unregisterd nexuses,
 495                          * as we expect registered non-reservation holding
 496                          * nexuses to issue CDBs.
 497                          */
 498
 499                         if (!registered_nexus) {
 500                                 pr_debug("Allowing implict CDB: 0x%02x"
 501                                         " for %s reservation on unregistered"
 502                                         " nexus\n", cdb[0],
 503                                         core_scsi3_pr_dump_type(pr_reg_type));
 504                         }
 505
 506                         return 0;
 507                 }
 508         } else if ((reg_only) || (all_reg)) {
 509                 if (registered_nexus) {
 510                         /*
 511                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 512                          * allow commands from registered nexuses.
 513                          */
 514
 515                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 516                                 " reservation\n", cdb[0],
 517                                 core_scsi3_pr_dump_type(pr_reg_type));
 518
 519                         return 0;
 520                 }
 521         }
 522         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 523                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 524                 (registered_nexus) ? "" : "un",
 525                 se_sess->se_node_acl->initiatorname, cdb[0],
 526                 core_scsi3_pr_dump_type(pr_reg_type));
 527
 528         return 1; /* Conflict by default */
 529 }
 530
 531 static sense_reason_t
 532 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 533 {
 534         struct se_device *dev = cmd->se_dev;
 535         struct se_session *sess = cmd->se_sess;
 536         u32 pr_reg_type;
 537
 538         if (!dev->dev_pr_res_holder)
 539                 return 0;
 540
 541         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 542         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 543         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 544                 goto check_nonholder;
 545
 546         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 547                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 548                     sess->sess_bin_isid) {
 549                         pr_reg_type |= 0x80000000;
 550                         goto check_nonholder;
 551                 }
 552         }
 553
 554         return 0;
 555
 556 check_nonholder:
 557         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
 558                 return TCM_RESERVATION_CONFLICT;
 559         return 0;
 560 }
 561
 562 static u32 core_scsi3_pr_generation(struct se_device *dev)
 563 {
 564         u32 prg;
 565
 566         /*
 567          * PRGeneration field shall contain the value of a 32-bit wrapping
 568          * counter mainted by the device server.
 569          *
 570          * Note that this is done regardless of Active Persist across
 571          * Target PowerLoss (APTPL)
 572          *
 573          * See spc4r17 section 6.3.12 READ_KEYS service action
 574          */
 575         spin_lock(&dev->dev_reservation_lock);
 576         prg = dev->t10_pr.pr_generation++;
 577         spin_unlock(&dev->dev_reservation_lock);
 578
 579         return prg;
 580 }
 581
 582 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 583         struct se_device *dev,
 584         struct se_node_acl *nacl,
 585         struct se_dev_entry *deve,
 586         unsigned char *isid,
 587         u64 sa_res_key,
 588         int all_tg_pt,
 589         int aptpl)
 590 {
 591         struct t10_pr_registration *pr_reg;
 592
 593         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 594         if (!pr_reg) {
 595                 pr_err("Unable to allocate struct t10_pr_registration\n");
 596                 return NULL;
 597         }
 598
 599         pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len,
 600                                         GFP_ATOMIC);
 601         if (!pr_reg->pr_aptpl_buf) {
 602                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 603                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 604                 return NULL;
 605         }
 606
 607         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 608         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 609         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 610         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 611         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 612         atomic_set(&pr_reg->pr_res_holders, 0);
 613         pr_reg->pr_reg_nacl = nacl;
 614         pr_reg->pr_reg_deve = deve;
 615         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 616         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 617         pr_reg->pr_res_key = sa_res_key;
 618         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 619         pr_reg->pr_reg_aptpl = aptpl;
 620         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 621         /*
 622          * If an ISID value for this SCSI Initiator Port exists,
 623          * save it to the registration now.
 624          */
 625         if (isid != NULL) {
 626                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 627                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 628                 pr_reg->isid_present_at_reg = 1;
 629         }
 630
 631         return pr_reg;
 632 }
 633
 634 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 635 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 636
 637 /*
 638  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 639  * modes.
 640  */
 641 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 642         struct se_device *dev,
 643         struct se_node_acl *nacl,
 644         struct se_dev_entry *deve,
 645         unsigned char *isid,
 646         u64 sa_res_key,
 647         int all_tg_pt,
 648         int aptpl)
 649 {
 650         struct se_dev_entry *deve_tmp;
 651         struct se_node_acl *nacl_tmp;
 652         struct se_port *port, *port_tmp;
 653         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 654         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 655         int ret;
 656         /*
 657          * Create a registration for the I_T Nexus upon which the
 658          * PROUT REGISTER was received.
 659          */
 660         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 661                         sa_res_key, all_tg_pt, aptpl);
 662         if (!pr_reg)
 663                 return NULL;
 664         /*
 665          * Return pointer to pr_reg for ALL_TG_PT=0
 666          */
 667         if (!all_tg_pt)
 668                 return pr_reg;
 669         /*
 670          * Create list of matching SCSI Initiator Port registrations
 671          * for ALL_TG_PT=1
 672          */
 673         spin_lock(&dev->se_port_lock);
 674         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 675                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 676                 smp_mb__after_atomic_inc();
 677                 spin_unlock(&dev->se_port_lock);
 678
 679                 spin_lock_bh(&port->sep_alua_lock);
 680                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 681                                         alua_port_list) {
 682                         /*
 683                          * This pointer will be NULL for demo mode MappedLUNs
 684                          * that have not been make explict via a ConfigFS
 685                          * MappedLUN group for the SCSI Initiator Node ACL.
 686                          */
 687                         if (!deve_tmp->se_lun_acl)
 688                                 continue;
 689
 690                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 691                         /*
 692                          * Skip the matching struct se_node_acl that is allocated
 693                          * above..
 694                          */
 695                         if (nacl == nacl_tmp)
 696                                 continue;
 697                         /*
 698                          * Only perform PR registrations for target ports on
 699                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 700                          * arrived.
 701                          */
 702                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 703                                 continue;
 704                         /*
 705                          * Look for a matching Initiator Node ACL in ASCII format
 706                          */
 707                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 708                                 continue;
 709
 710                         atomic_inc(&deve_tmp->pr_ref_count);
 711                         smp_mb__after_atomic_inc();
 712                         spin_unlock_bh(&port->sep_alua_lock);
 713                         /*
 714                          * Grab a configfs group dependency that is released
 715                          * for the exception path at label out: below, or upon
 716                          * completion of adding ALL_TG_PT=1 registrations in
 717                          * __core_scsi3_add_registration()
 718                          */
 719                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 720                         if (ret < 0) {
 721                                 pr_err("core_scsi3_lunacl_depend"
 722                                                 "_item() failed\n");
 723                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 724                                 smp_mb__after_atomic_dec();
 725                                 atomic_dec(&deve_tmp->pr_ref_count);
 726                                 smp_mb__after_atomic_dec();
 727                                 goto out;
 728                         }
 729                         /*
 730                          * Located a matching SCSI Initiator Port on a different
 731                          * port, allocate the pr_reg_atp and attach it to the
 732                          * pr_reg->pr_reg_atp_list that will be processed once
 733                          * the original *pr_reg is processed in
 734                          * __core_scsi3_add_registration()
 735                          */
 736                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 737                                                 nacl_tmp, deve_tmp, NULL,
 738                                                 sa_res_key, all_tg_pt, aptpl);
 739                         if (!pr_reg_atp) {
 740                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 741                                 smp_mb__after_atomic_dec();
 742                                 atomic_dec(&deve_tmp->pr_ref_count);
 743                                 smp_mb__after_atomic_dec();
 744                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 745                                 goto out;
 746                         }
 747
 748                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 749                                       &pr_reg->pr_reg_atp_list);
 750                         spin_lock_bh(&port->sep_alua_lock);
 751                 }
 752                 spin_unlock_bh(&port->sep_alua_lock);
 753
 754                 spin_lock(&dev->se_port_lock);
 755                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 756                 smp_mb__after_atomic_dec();
 757         }
 758         spin_unlock(&dev->se_port_lock);
 759
 760         return pr_reg;
 761 out:
 762         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 763                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 764                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 765                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 766                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 767         }
 768         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 769         return NULL;
 770 }
 771
 772 int core_scsi3_alloc_aptpl_registration(
 773         struct t10_reservation *pr_tmpl,
 774         u64 sa_res_key,
 775         unsigned char *i_port,
 776         unsigned char *isid,
 777         u32 mapped_lun,
 778         unsigned char *t_port,
 779         u16 tpgt,
 780         u32 target_lun,
 781         int res_holder,
 782         int all_tg_pt,
 783         u8 type)
 784 {
 785         struct t10_pr_registration *pr_reg;
 786
 787         if (!i_port || !t_port || !sa_res_key) {
 788                 pr_err("Illegal parameters for APTPL registration\n");
 789                 return -EINVAL;
 790         }
 791
 792         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 793         if (!pr_reg) {
 794                 pr_err("Unable to allocate struct t10_pr_registration\n");
 795                 return -ENOMEM;
 796         }
 797         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 798
 799         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 800         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 801         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 802         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 803         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 804         atomic_set(&pr_reg->pr_res_holders, 0);
 805         pr_reg->pr_reg_nacl = NULL;
 806         pr_reg->pr_reg_deve = NULL;
 807         pr_reg->pr_res_mapped_lun = mapped_lun;
 808         pr_reg->pr_aptpl_target_lun = target_lun;
 809         pr_reg->pr_res_key = sa_res_key;
 810         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 811         pr_reg->pr_reg_aptpl = 1;
 812         pr_reg->pr_reg_tg_pt_lun = NULL;
 813         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 814         pr_reg->pr_res_type = type;
 815         /*
 816          * If an ISID value had been saved in APTPL metadata for this
 817          * SCSI Initiator Port, restore it now.
 818          */
 819         if (isid != NULL) {
 820                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 821                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 822                 pr_reg->isid_present_at_reg = 1;
 823         }
 824         /*
 825          * Copy the i_port and t_port information from caller.
 826          */
 827         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 828         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 829         pr_reg->pr_reg_tpgt = tpgt;
 830         /*
 831          * Set pr_res_holder from caller, the pr_reg who is the reservation
 832          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 833          * the Initiator Node LUN ACL from the fabric module is created for
 834          * this registration.
 835          */
 836         pr_reg->pr_res_holder = res_holder;
 837
 838         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 839         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 840                         " metadata\n", (res_holder) ? "+reservation" : "");
 841         return 0;
 842 }
 843
 844 static void core_scsi3_aptpl_reserve(
 845         struct se_device *dev,
 846         struct se_portal_group *tpg,
 847         struct se_node_acl *node_acl,
 848         struct t10_pr_registration *pr_reg)
 849 {
 850         char i_buf[PR_REG_ISID_ID_LEN];
 851         int prf_isid;
 852
 853         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 854         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 855                                 PR_REG_ISID_ID_LEN);
 856
 857         spin_lock(&dev->dev_reservation_lock);
 858         dev->dev_pr_res_holder = pr_reg;
 859         spin_unlock(&dev->dev_reservation_lock);
 860
 861         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 862                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 863                 tpg->se_tpg_tfo->get_fabric_name(),
 864                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 865                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 866         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 867                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 868                 (prf_isid) ? &i_buf[0] : "");
 869 }
 870
 871 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 872                                 struct t10_pr_registration *, int, int);
 873
 874 static int __core_scsi3_check_aptpl_registration(
 875         struct se_device *dev,
 876         struct se_portal_group *tpg,
 877         struct se_lun *lun,
 878         u32 target_lun,
 879         struct se_node_acl *nacl,
 880         struct se_dev_entry *deve)
 881 {
 882         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 883         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 884         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 885         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 886         u16 tpgt;
 887
 888         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 889         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 890         /*
 891          * Copy Initiator Port information from struct se_node_acl
 892          */
 893         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 894         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 895                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 896         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 897         /*
 898          * Look for the matching registrations+reservation from those
 899          * created from APTPL metadata.  Note that multiple registrations
 900          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 901          * TransportIDs.
 902          */
 903         spin_lock(&pr_tmpl->aptpl_reg_lock);
 904         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 905                                 pr_reg_aptpl_list) {
 906                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 907                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 908                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 909                      (pr_reg->pr_reg_tpgt == tpgt) &&
 910                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 911
 912                         pr_reg->pr_reg_nacl = nacl;
 913                         pr_reg->pr_reg_deve = deve;
 914                         pr_reg->pr_reg_tg_pt_lun = lun;
 915
 916                         list_del(&pr_reg->pr_reg_aptpl_list);
 917                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 918                         /*
 919                          * At this point all of the pointers in *pr_reg will
 920                          * be setup, so go ahead and add the registration.
 921                          */
 922
 923                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 924                         /*
 925                          * If this registration is the reservation holder,
 926                          * make that happen now..
 927                          */
 928                         if (pr_reg->pr_res_holder)
 929                                 core_scsi3_aptpl_reserve(dev, tpg,
 930                                                 nacl, pr_reg);
 931                         /*
 932                          * Reenable pr_aptpl_active to accept new metadata
 933                          * updates once the SCSI device is active again..
 934                          */
 935                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 936                         pr_tmpl->pr_aptpl_active = 1;
 937                 }
 938         }
 939         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 940
 941         return 0;
 942 }
 943
 944 int core_scsi3_check_aptpl_registration(
 945         struct se_device *dev,
 946         struct se_portal_group *tpg,
 947         struct se_lun *lun,
 948         struct se_node_acl *nacl,
 949         u32 mapped_lun)
 950 {
 951         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 952
 953         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
 954                 return 0;
 955
 956         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 957                                 lun->unpacked_lun, nacl, deve);
 958 }
 959
 960 static void __core_scsi3_dump_registration(
 961         struct target_core_fabric_ops *tfo,
 962         struct se_device *dev,
 963         struct se_node_acl *nacl,
 964         struct t10_pr_registration *pr_reg,
 965         int register_type)
 966 {
 967         struct se_portal_group *se_tpg = nacl->se_tpg;
 968         char i_buf[PR_REG_ISID_ID_LEN];
 969         int prf_isid;
 970
 971         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
 972         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 973                                 PR_REG_ISID_ID_LEN);
 974
 975         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
 976                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
 977                 "_AND_MOVE" : (register_type == 1) ?
 978                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
 979                 (prf_isid) ? i_buf : "");
 980         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
 981                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
 982                 tfo->tpg_get_tag(se_tpg));
 983         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
 984                 " Port(s)\n",  tfo->get_fabric_name(),
 985                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
 986                 dev->transport->name);
 987         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
 988                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
 989                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
 990                 pr_reg->pr_reg_aptpl);
 991 }
 992
 993 /*
 994  * this function can be called with struct se_device->dev_reservation_lock
 995  * when register_move = 1
 996  */
 997 static void __core_scsi3_add_registration(
 998         struct se_device *dev,
 999         struct se_node_acl *nacl,
1000         struct t10_pr_registration *pr_reg,
1001         int register_type,
1002         int register_move)
1003 {
1004         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1005         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1006         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1007
1008         /*
1009          * Increment PRgeneration counter for struct se_device upon a successful
1010          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1011          *
1012          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1013          * action, the struct se_device->dev_reservation_lock will already be held,
1014          * so we do not call core_scsi3_pr_generation() which grabs the lock
1015          * for the REGISTER.
1016          */
1017         pr_reg->pr_res_generation = (register_move) ?
1018                         dev->t10_pr.pr_generation++ :
1019                         core_scsi3_pr_generation(dev);
1020
1021         spin_lock(&pr_tmpl->registration_lock);
1022         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1023         pr_reg->pr_reg_deve->def_pr_registered = 1;
1024
1025         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1026         spin_unlock(&pr_tmpl->registration_lock);
1027         /*
1028          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1029          */
1030         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1031                 return;
1032         /*
1033          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1034          * allocated in __core_scsi3_alloc_registration()
1035          */
1036         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1037                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1038                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1039
1040                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1041
1042                 spin_lock(&pr_tmpl->registration_lock);
1043                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1044                               &pr_tmpl->registration_list);
1045                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1046
1047                 __core_scsi3_dump_registration(tfo, dev,
1048                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1049                                 register_type);
1050                 spin_unlock(&pr_tmpl->registration_lock);
1051                 /*
1052                  * Drop configfs group dependency reference from
1053                  * __core_scsi3_alloc_registration()
1054                  */
1055                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1056         }
1057 }
1058
1059 static int core_scsi3_alloc_registration(
1060         struct se_device *dev,
1061         struct se_node_acl *nacl,
1062         struct se_dev_entry *deve,
1063         unsigned char *isid,
1064         u64 sa_res_key,
1065         int all_tg_pt,
1066         int aptpl,
1067         int register_type,
1068         int register_move)
1069 {
1070         struct t10_pr_registration *pr_reg;
1071
1072         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1073                         sa_res_key, all_tg_pt, aptpl);
1074         if (!pr_reg)
1075                 return -EPERM;
1076
1077         __core_scsi3_add_registration(dev, nacl, pr_reg,
1078                         register_type, register_move);
1079         return 0;
1080 }
1081
1082 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1083         struct se_device *dev,
1084         struct se_node_acl *nacl,
1085         unsigned char *isid)
1086 {
1087         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1088         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1089         struct se_portal_group *tpg;
1090
1091         spin_lock(&pr_tmpl->registration_lock);
1092         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1093                         &pr_tmpl->registration_list, pr_reg_list) {
1094                 /*
1095                  * First look for a matching struct se_node_acl
1096                  */
1097                 if (pr_reg->pr_reg_nacl != nacl)
1098                         continue;
1099
1100                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1101                 /*
1102                  * If this registration does NOT contain a fabric provided
1103                  * ISID, then we have found a match.
1104                  */
1105                 if (!pr_reg->isid_present_at_reg) {
1106                         /*
1107                          * Determine if this SCSI device server requires that
1108                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1109                          * for fabric modules (iSCSI) requiring them.
1110                          */
1111                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1112                                 if (dev->dev_attrib.enforce_pr_isids)
1113                                         continue;
1114                         }
1115                         atomic_inc(&pr_reg->pr_res_holders);
1116                         smp_mb__after_atomic_inc();
1117                         spin_unlock(&pr_tmpl->registration_lock);
1118                         return pr_reg;
1119                 }
1120                 /*
1121                  * If the *pr_reg contains a fabric defined ISID for multi-value
1122                  * SCSI Initiator Port TransportIDs, then we expect a valid
1123                  * matching ISID to be provided by the local SCSI Initiator Port.
1124                  */
1125                 if (!isid)
1126                         continue;
1127                 if (strcmp(isid, pr_reg->pr_reg_isid))
1128                         continue;
1129
1130                 atomic_inc(&pr_reg->pr_res_holders);
1131                 smp_mb__after_atomic_inc();
1132                 spin_unlock(&pr_tmpl->registration_lock);
1133                 return pr_reg;
1134         }
1135         spin_unlock(&pr_tmpl->registration_lock);
1136
1137         return NULL;
1138 }
1139
1140 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1141         struct se_device *dev,
1142         struct se_node_acl *nacl,
1143         struct se_session *sess)
1144 {
1145         struct se_portal_group *tpg = nacl->se_tpg;
1146         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1147
1148         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1149                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1150                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1151                                         PR_REG_ISID_LEN);
1152                 isid_ptr = &buf[0];
1153         }
1154
1155         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1156 }
1157
1158 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1159 {
1160         atomic_dec(&pr_reg->pr_res_holders);
1161         smp_mb__after_atomic_dec();
1162 }
1163
1164 static int core_scsi3_check_implict_release(
1165         struct se_device *dev,
1166         struct t10_pr_registration *pr_reg)
1167 {
1168         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1169         struct t10_pr_registration *pr_res_holder;
1170         int ret = 0;
1171
1172         spin_lock(&dev->dev_reservation_lock);
1173         pr_res_holder = dev->dev_pr_res_holder;
1174         if (!pr_res_holder) {
1175                 spin_unlock(&dev->dev_reservation_lock);
1176                 return ret;
1177         }
1178         if (pr_res_holder == pr_reg) {
1179                 /*
1180                  * Perform an implict RELEASE if the registration that
1181                  * is being released is holding the reservation.
1182                  *
1183                  * From spc4r17, section 5.7.11.1:
1184                  *
1185                  * e) If the I_T nexus is the persistent reservation holder
1186                  *    and the persistent reservation is not an all registrants
1187                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1188                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1189                  *    service action with the SERVICE ACTION RESERVATION KEY
1190                  *    field set to zero (see 5.7.11.3).
1191                  */
1192                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1193                 ret = 1;
1194                 /*
1195                  * For 'All Registrants' reservation types, all existing
1196                  * registrations are still processed as reservation holders
1197                  * in core_scsi3_pr_seq_non_holder() after the initial
1198                  * reservation holder is implictly released here.
1199                  */
1200         } else if (pr_reg->pr_reg_all_tg_pt &&
1201                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1202                           pr_reg->pr_reg_nacl->initiatorname)) &&
1203                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1204                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1205                         " UNREGISTER while existing reservation with matching"
1206                         " key 0x%016Lx is present from another SCSI Initiator"
1207                         " Port\n", pr_reg->pr_res_key);
1208                 ret = -EPERM;
1209         }
1210         spin_unlock(&dev->dev_reservation_lock);
1211
1212         return ret;
1213 }
1214
1215 /*
1216  * Called with struct t10_reservation->registration_lock held.
1217  */
1218 static void __core_scsi3_free_registration(
1219         struct se_device *dev,
1220         struct t10_pr_registration *pr_reg,
1221         struct list_head *preempt_and_abort_list,
1222         int dec_holders)
1223 {
1224         struct target_core_fabric_ops *tfo =
1225                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1226         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1227         char i_buf[PR_REG_ISID_ID_LEN];
1228         int prf_isid;
1229
1230         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1231         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1232                                 PR_REG_ISID_ID_LEN);
1233
1234         pr_reg->pr_reg_deve->def_pr_registered = 0;
1235         pr_reg->pr_reg_deve->pr_res_key = 0;
1236         list_del(&pr_reg->pr_reg_list);
1237         /*
1238          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1239          * so call core_scsi3_put_pr_reg() to decrement our reference.
1240          */
1241         if (dec_holders)
1242                 core_scsi3_put_pr_reg(pr_reg);
1243         /*
1244          * Wait until all reference from any other I_T nexuses for this
1245          * *pr_reg have been released.  Because list_del() is called above,
1246          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1247          * count back to zero, and we release *pr_reg.
1248          */
1249         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1250                 spin_unlock(&pr_tmpl->registration_lock);
1251                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1252                                 tfo->get_fabric_name());
1253                 cpu_relax();
1254                 spin_lock(&pr_tmpl->registration_lock);
1255         }
1256
1257         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1258                 " Node: %s%s\n", tfo->get_fabric_name(),
1259                 pr_reg->pr_reg_nacl->initiatorname,
1260                 (prf_isid) ? &i_buf[0] : "");
1261         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1262                 " Port(s)\n", tfo->get_fabric_name(),
1263                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1264                 dev->transport->name);
1265         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1266                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1267                 pr_reg->pr_res_generation);
1268
1269         if (!preempt_and_abort_list) {
1270                 pr_reg->pr_reg_deve = NULL;
1271                 pr_reg->pr_reg_nacl = NULL;
1272                 kfree(pr_reg->pr_aptpl_buf);
1273                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1274                 return;
1275         }
1276         /*
1277          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1278          * are released once the ABORT_TASK_SET has completed..
1279          */
1280         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1281 }
1282
1283 void core_scsi3_free_pr_reg_from_nacl(
1284         struct se_device *dev,
1285         struct se_node_acl *nacl)
1286 {
1287         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1288         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1289         /*
1290          * If the passed se_node_acl matches the reservation holder,
1291          * release the reservation.
1292          */
1293         spin_lock(&dev->dev_reservation_lock);
1294         pr_res_holder = dev->dev_pr_res_holder;
1295         if ((pr_res_holder != NULL) &&
1296             (pr_res_holder->pr_reg_nacl == nacl))
1297                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1298         spin_unlock(&dev->dev_reservation_lock);
1299         /*
1300          * Release any registration associated with the struct se_node_acl.
1301          */
1302         spin_lock(&pr_tmpl->registration_lock);
1303         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1304                         &pr_tmpl->registration_list, pr_reg_list) {
1305
1306                 if (pr_reg->pr_reg_nacl != nacl)
1307                         continue;
1308
1309                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1310         }
1311         spin_unlock(&pr_tmpl->registration_lock);
1312 }
1313
1314 void core_scsi3_free_all_registrations(
1315         struct se_device *dev)
1316 {
1317         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1318         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1319
1320         spin_lock(&dev->dev_reservation_lock);
1321         pr_res_holder = dev->dev_pr_res_holder;
1322         if (pr_res_holder != NULL) {
1323                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1324                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1325                                 pr_res_holder, 0);
1326         }
1327         spin_unlock(&dev->dev_reservation_lock);
1328
1329         spin_lock(&pr_tmpl->registration_lock);
1330         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1331                         &pr_tmpl->registration_list, pr_reg_list) {
1332
1333                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1334         }
1335         spin_unlock(&pr_tmpl->registration_lock);
1336
1337         spin_lock(&pr_tmpl->aptpl_reg_lock);
1338         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1339                                 pr_reg_aptpl_list) {
1340                 list_del(&pr_reg->pr_reg_aptpl_list);
1341                 kfree(pr_reg->pr_aptpl_buf);
1342                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1343         }
1344         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1345 }
1346
1347 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1348 {
1349         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1350                         &tpg->tpg_group.cg_item);
1351 }
1352
1353 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1354 {
1355         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1356                         &tpg->tpg_group.cg_item);
1357
1358         atomic_dec(&tpg->tpg_pr_ref_count);
1359         smp_mb__after_atomic_dec();
1360 }
1361
1362 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1363 {
1364         struct se_portal_group *tpg = nacl->se_tpg;
1365
1366         if (nacl->dynamic_node_acl)
1367                 return 0;
1368
1369         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1370                         &nacl->acl_group.cg_item);
1371 }
1372
1373 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1374 {
1375         struct se_portal_group *tpg = nacl->se_tpg;
1376
1377         if (nacl->dynamic_node_acl) {
1378                 atomic_dec(&nacl->acl_pr_ref_count);
1379                 smp_mb__after_atomic_dec();
1380                 return;
1381         }
1382
1383         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1384                         &nacl->acl_group.cg_item);
1385
1386         atomic_dec(&nacl->acl_pr_ref_count);
1387         smp_mb__after_atomic_dec();
1388 }
1389
1390 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1391 {
1392         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1393         struct se_node_acl *nacl;
1394         struct se_portal_group *tpg;
1395         /*
1396          * For nacl->dynamic_node_acl=1
1397          */
1398         if (!lun_acl)
1399                 return 0;
1400
1401         nacl = lun_acl->se_lun_nacl;
1402         tpg = nacl->se_tpg;
1403
1404         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1405                         &lun_acl->se_lun_group.cg_item);
1406 }
1407
1408 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1409 {
1410         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1411         struct se_node_acl *nacl;
1412         struct se_portal_group *tpg;
1413         /*
1414          * For nacl->dynamic_node_acl=1
1415          */
1416         if (!lun_acl) {
1417                 atomic_dec(&se_deve->pr_ref_count);
1418                 smp_mb__after_atomic_dec();
1419                 return;
1420         }
1421         nacl = lun_acl->se_lun_nacl;
1422         tpg = nacl->se_tpg;
1423
1424         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1425                         &lun_acl->se_lun_group.cg_item);
1426
1427         atomic_dec(&se_deve->pr_ref_count);
1428         smp_mb__after_atomic_dec();
1429 }
1430
1431 static sense_reason_t
1432 core_scsi3_decode_spec_i_port(
1433         struct se_cmd *cmd,
1434         struct se_portal_group *tpg,
1435         unsigned char *l_isid,
1436         u64 sa_res_key,
1437         int all_tg_pt,
1438         int aptpl)
1439 {
1440         struct se_device *dev = cmd->se_dev;
1441         struct se_port *tmp_port;
1442         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1443         struct se_session *se_sess = cmd->se_sess;
1444         struct se_node_acl *dest_node_acl = NULL;
1445         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1446         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1447         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1448         LIST_HEAD(tid_dest_list);
1449         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1450         struct target_core_fabric_ops *tmp_tf_ops;
1451         unsigned char *buf;
1452         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1453         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1454         sense_reason_t ret;
1455         u32 tpdl, tid_len = 0;
1456         int dest_local_nexus, prf_isid;
1457         u32 dest_rtpi = 0;
1458
1459         memset(dest_iport, 0, 64);
1460
1461         local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1462         /*
1463          * Allocate a struct pr_transport_id_holder and setup the
1464          * local_node_acl and local_se_deve pointers and add to
1465          * struct list_head tid_dest_list for add registration
1466          * processing in the loop of tid_dest_list below.
1467          */
1468         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1469         if (!tidh_new) {
1470                 pr_err("Unable to allocate tidh_new\n");
1471                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1472         }
1473         INIT_LIST_HEAD(&tidh_new->dest_list);
1474         tidh_new->dest_tpg = tpg;
1475         tidh_new->dest_node_acl = se_sess->se_node_acl;
1476         tidh_new->dest_se_deve = local_se_deve;
1477
1478         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1479                                 se_sess->se_node_acl, local_se_deve, l_isid,
1480                                 sa_res_key, all_tg_pt, aptpl);
1481         if (!local_pr_reg) {
1482                 kfree(tidh_new);
1483                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1484         }
1485         tidh_new->dest_pr_reg = local_pr_reg;
1486         /*
1487          * The local I_T nexus does not hold any configfs dependances,
1488          * so we set tid_h->dest_local_nexus=1 to prevent the
1489          * configfs_undepend_item() calls in the tid_dest_list loops below.
1490          */
1491         tidh_new->dest_local_nexus = 1;
1492         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1493
1494         if (cmd->data_length < 28) {
1495                 pr_warn("SPC-PR: Received PR OUT parameter list"
1496                         " length too small: %u\n", cmd->data_length);
1497                 ret = TCM_INVALID_PARAMETER_LIST;
1498                 goto out;
1499         }
1500
1501         buf = transport_kmap_data_sg(cmd);
1502         if (!buf) {
1503                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1504                 goto out;
1505         }
1506
1507         /*
1508          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1509          * first extract TransportID Parameter Data Length, and make sure
1510          * the value matches up to the SCSI expected data transfer length.
1511          */
1512         tpdl = (buf[24] & 0xff) << 24;
1513         tpdl |= (buf[25] & 0xff) << 16;
1514         tpdl |= (buf[26] & 0xff) << 8;
1515         tpdl |= buf[27] & 0xff;
1516
1517         if ((tpdl + 28) != cmd->data_length) {
1518                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1519                         " does not equal CDB data_length: %u\n", tpdl,
1520                         cmd->data_length);
1521                 ret = TCM_INVALID_PARAMETER_LIST;
1522                 goto out_unmap;
1523         }
1524         /*
1525          * Start processing the received transport IDs using the
1526          * receiving I_T Nexus portal's fabric dependent methods to
1527          * obtain the SCSI Initiator Port/Device Identifiers.
1528          */
1529         ptr = &buf[28];
1530
1531         while (tpdl > 0) {
1532                 proto_ident = (ptr[0] & 0x0f);
1533                 dest_tpg = NULL;
1534
1535                 spin_lock(&dev->se_port_lock);
1536                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1537                         tmp_tpg = tmp_port->sep_tpg;
1538                         if (!tmp_tpg)
1539                                 continue;
1540                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1541                         if (!tmp_tf_ops)
1542                                 continue;
1543                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1544                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1545                                 continue;
1546                         /*
1547                          * Look for the matching proto_ident provided by
1548                          * the received TransportID
1549                          */
1550                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1551                         if (tmp_proto_ident != proto_ident)
1552                                 continue;
1553                         dest_rtpi = tmp_port->sep_rtpi;
1554
1555                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1556                                         tmp_tpg, (const char *)ptr, &tid_len,
1557                                         &iport_ptr);
1558                         if (!i_str)
1559                                 continue;
1560
1561                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1562                         smp_mb__after_atomic_inc();
1563                         spin_unlock(&dev->se_port_lock);
1564
1565                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1566                                 pr_err(" core_scsi3_tpg_depend_item()"
1567                                         " for tmp_tpg\n");
1568                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1569                                 smp_mb__after_atomic_dec();
1570                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1571                                 goto out_unmap;
1572                         }
1573                         /*
1574                          * Locate the destination initiator ACL to be registered
1575                          * from the decoded fabric module specific TransportID
1576                          * at *i_str.
1577                          */
1578                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1579                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1580                                                 tmp_tpg, i_str);
1581                         if (dest_node_acl) {
1582                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1583                                 smp_mb__after_atomic_inc();
1584                         }
1585                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1586
1587                         if (!dest_node_acl) {
1588                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1589                                 spin_lock(&dev->se_port_lock);
1590                                 continue;
1591                         }
1592
1593                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1594                                 pr_err("configfs_depend_item() failed"
1595                                         " for dest_node_acl->acl_group\n");
1596                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1597                                 smp_mb__after_atomic_dec();
1598                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1599                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1600                                 goto out_unmap;
1601                         }
1602
1603                         dest_tpg = tmp_tpg;
1604                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1605                                 " %s Port RTPI: %hu\n",
1606                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1607                                 dest_node_acl->initiatorname, dest_rtpi);
1608
1609                         spin_lock(&dev->se_port_lock);
1610                         break;
1611                 }
1612                 spin_unlock(&dev->se_port_lock);
1613
1614                 if (!dest_tpg) {
1615                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1616                                         " dest_tpg\n");
1617                         ret = TCM_INVALID_PARAMETER_LIST;
1618                         goto out_unmap;
1619                 }
1620
1621                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1622                         " tid_len: %d for %s + %s\n",
1623                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1624                         tpdl, tid_len, i_str, iport_ptr);
1625
1626                 if (tid_len > tpdl) {
1627                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1628                                 " %u for Transport ID: %s\n", tid_len, ptr);
1629                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1630                         core_scsi3_tpg_undepend_item(dest_tpg);
1631                         ret = TCM_INVALID_PARAMETER_LIST;
1632                         goto out_unmap;
1633                 }
1634                 /*
1635                  * Locate the desintation struct se_dev_entry pointer for matching
1636                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1637                  * Target Port.
1638                  */
1639                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1640                                         dest_rtpi);
1641                 if (!dest_se_deve) {
1642                         pr_err("Unable to locate %s dest_se_deve"
1643                                 " from destination RTPI: %hu\n",
1644                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1645                                 dest_rtpi);
1646
1647                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1648                         core_scsi3_tpg_undepend_item(dest_tpg);
1649                         ret = TCM_INVALID_PARAMETER_LIST;
1650                         goto out_unmap;
1651                 }
1652
1653                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1654                         pr_err("core_scsi3_lunacl_depend_item()"
1655                                         " failed\n");
1656                         atomic_dec(&dest_se_deve->pr_ref_count);
1657                         smp_mb__after_atomic_dec();
1658                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1659                         core_scsi3_tpg_undepend_item(dest_tpg);
1660                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1661                         goto out_unmap;
1662                 }
1663
1664                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1665                         " dest_se_deve mapped_lun: %u\n",
1666                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1667                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1668
1669                 /*
1670                  * Skip any TransportIDs that already have a registration for
1671                  * this target port.
1672                  */
1673                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1674                                         iport_ptr);
1675                 if (pr_reg_e) {
1676                         core_scsi3_put_pr_reg(pr_reg_e);
1677                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1678                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1679                         core_scsi3_tpg_undepend_item(dest_tpg);
1680                         ptr += tid_len;
1681                         tpdl -= tid_len;
1682                         tid_len = 0;
1683                         continue;
1684                 }
1685                 /*
1686                  * Allocate a struct pr_transport_id_holder and setup
1687                  * the dest_node_acl and dest_se_deve pointers for the
1688                  * loop below.
1689                  */
1690                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1691                                 GFP_KERNEL);
1692                 if (!tidh_new) {
1693                         pr_err("Unable to allocate tidh_new\n");
1694                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1695                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1696                         core_scsi3_tpg_undepend_item(dest_tpg);
1697                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1698                         goto out_unmap;
1699                 }
1700                 INIT_LIST_HEAD(&tidh_new->dest_list);
1701                 tidh_new->dest_tpg = dest_tpg;
1702                 tidh_new->dest_node_acl = dest_node_acl;
1703                 tidh_new->dest_se_deve = dest_se_deve;
1704
1705                 /*
1706                  * Allocate, but do NOT add the registration for the
1707                  * TransportID referenced SCSI Initiator port.  This
1708                  * done because of the following from spc4r17 in section
1709                  * 6.14.3 wrt SPEC_I_PT:
1710                  *
1711                  * "If a registration fails for any initiator port (e.g., if th
1712                  * logical unit does not have enough resources available to
1713                  * hold the registration information), no registrations shall be
1714                  * made, and the command shall be terminated with
1715                  * CHECK CONDITION status."
1716                  *
1717                  * That means we call __core_scsi3_alloc_registration() here,
1718                  * and then call __core_scsi3_add_registration() in the
1719                  * 2nd loop which will never fail.
1720                  */
1721                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1722                                 dest_node_acl, dest_se_deve, iport_ptr,
1723                                 sa_res_key, all_tg_pt, aptpl);
1724                 if (!dest_pr_reg) {
1725                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1726                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1727                         core_scsi3_tpg_undepend_item(dest_tpg);
1728                         kfree(tidh_new);
1729                         ret = TCM_INVALID_PARAMETER_LIST;
1730                         goto out_unmap;
1731                 }
1732                 tidh_new->dest_pr_reg = dest_pr_reg;
1733                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1734
1735                 ptr += tid_len;
1736                 tpdl -= tid_len;
1737                 tid_len = 0;
1738
1739         }
1740
1741         transport_kunmap_data_sg(cmd);
1742
1743         /*
1744          * Go ahead and create a registrations from tid_dest_list for the
1745          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1746          * and dest_se_deve.
1747          *
1748          * The SA Reservation Key from the PROUT is set for the
1749          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1750          * means that the TransportID Initiator port will be
1751          * registered on all of the target ports in the SCSI target device
1752          * ALL_TG_PT=0 means the registration will only be for the
1753          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1754          * was received.
1755          */
1756         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1757                 dest_tpg = tidh->dest_tpg;
1758                 dest_node_acl = tidh->dest_node_acl;
1759                 dest_se_deve = tidh->dest_se_deve;
1760                 dest_pr_reg = tidh->dest_pr_reg;
1761                 dest_local_nexus = tidh->dest_local_nexus;
1762
1763                 list_del(&tidh->dest_list);
1764                 kfree(tidh);
1765
1766                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1767                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1768                                                 PR_REG_ISID_ID_LEN);
1769
1770                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1771                                         dest_pr_reg, 0, 0);
1772
1773                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1774                         " registered Transport ID for Node: %s%s Mapped LUN:"
1775                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1776                         dest_node_acl->initiatorname, (prf_isid) ?
1777                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1778
1779                 if (dest_local_nexus)
1780                         continue;
1781
1782                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1783                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1784                 core_scsi3_tpg_undepend_item(dest_tpg);
1785         }
1786
1787         return 0;
1788 out_unmap:
1789         transport_kunmap_data_sg(cmd);
1790 out:
1791         /*
1792          * For the failure case, release everything from tid_dest_list
1793          * including *dest_pr_reg and the configfs dependances..
1794          */
1795         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1796                 dest_tpg = tidh->dest_tpg;
1797                 dest_node_acl = tidh->dest_node_acl;
1798                 dest_se_deve = tidh->dest_se_deve;
1799                 dest_pr_reg = tidh->dest_pr_reg;
1800                 dest_local_nexus = tidh->dest_local_nexus;
1801
1802                 list_del(&tidh->dest_list);
1803                 kfree(tidh);
1804                 /*
1805                  * Release any extra ALL_TG_PT=1 registrations for
1806                  * the SPEC_I_PT=1 case.
1807                  */
1808                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1809                                 &dest_pr_reg->pr_reg_atp_list,
1810                                 pr_reg_atp_mem_list) {
1811                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1812                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1813                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1814                 }
1815
1816                 kfree(dest_pr_reg->pr_aptpl_buf);
1817                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1818
1819                 if (dest_local_nexus)
1820                         continue;
1821
1822                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1823                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1824                 core_scsi3_tpg_undepend_item(dest_tpg);
1825         }
1826         return ret;
1827 }
1828
1829 /*
1830  * Called with struct se_device->dev_reservation_lock held
1831  */
1832 static int __core_scsi3_update_aptpl_buf(
1833         struct se_device *dev,
1834         unsigned char *buf,
1835         u32 pr_aptpl_buf_len,
1836         int clear_aptpl_metadata)
1837 {
1838         struct se_lun *lun;
1839         struct se_portal_group *tpg;
1840         struct t10_pr_registration *pr_reg;
1841         unsigned char tmp[512], isid_buf[32];
1842         ssize_t len = 0;
1843         int reg_count = 0;
1844
1845         memset(buf, 0, pr_aptpl_buf_len);
1846         /*
1847          * Called to clear metadata once APTPL has been deactivated.
1848          */
1849         if (clear_aptpl_metadata) {
1850                 snprintf(buf, pr_aptpl_buf_len,
1851                                 "No Registrations or Reservations\n");
1852                 return 0;
1853         }
1854         /*
1855          * Walk the registration list..
1856          */
1857         spin_lock(&dev->t10_pr.registration_lock);
1858         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1859                         pr_reg_list) {
1860
1861                 tmp[0] = '\0';
1862                 isid_buf[0] = '\0';
1863                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1864                 lun = pr_reg->pr_reg_tg_pt_lun;
1865                 /*
1866                  * Write out any ISID value to APTPL metadata that was included
1867                  * in the original registration.
1868                  */
1869                 if (pr_reg->isid_present_at_reg)
1870                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1871                                         pr_reg->pr_reg_isid);
1872                 /*
1873                  * Include special metadata if the pr_reg matches the
1874                  * reservation holder.
1875                  */
1876                 if (dev->dev_pr_res_holder == pr_reg) {
1877                         snprintf(tmp, 512, "PR_REG_START: %d"
1878                                 "\ninitiator_fabric=%s\n"
1879                                 "initiator_node=%s\n%s"
1880                                 "sa_res_key=%llu\n"
1881                                 "res_holder=1\nres_type=%02x\n"
1882                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1883                                 "mapped_lun=%u\n", reg_count,
1884                                 tpg->se_tpg_tfo->get_fabric_name(),
1885                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1886                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1887                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1888                                 pr_reg->pr_res_mapped_lun);
1889                 } else {
1890                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1891                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1892                                 "sa_res_key=%llu\nres_holder=0\n"
1893                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1894                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1895                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1896                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1897                                 pr_reg->pr_res_mapped_lun);
1898                 }
1899
1900                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1901                         pr_err("Unable to update renaming"
1902                                 " APTPL metadata\n");
1903                         spin_unlock(&dev->t10_pr.registration_lock);
1904                         return -EMSGSIZE;
1905                 }
1906                 len += sprintf(buf+len, "%s", tmp);
1907
1908                 /*
1909                  * Include information about the associated SCSI target port.
1910                  */
1911                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1912                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1913                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1914                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1915                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1916                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1917
1918                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1919                         pr_err("Unable to update renaming"
1920                                 " APTPL metadata\n");
1921                         spin_unlock(&dev->t10_pr.registration_lock);
1922                         return -EMSGSIZE;
1923                 }
1924                 len += sprintf(buf+len, "%s", tmp);
1925                 reg_count++;
1926         }
1927         spin_unlock(&dev->t10_pr.registration_lock);
1928
1929         if (!reg_count)
1930                 len += sprintf(buf+len, "No Registrations or Reservations");
1931
1932         return 0;
1933 }
1934
1935 static int core_scsi3_update_aptpl_buf(
1936         struct se_device *dev,
1937         unsigned char *buf,
1938         u32 pr_aptpl_buf_len,
1939         int clear_aptpl_metadata)
1940 {
1941         int ret;
1942
1943         spin_lock(&dev->dev_reservation_lock);
1944         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1945                                 clear_aptpl_metadata);
1946         spin_unlock(&dev->dev_reservation_lock);
1947
1948         return ret;
1949 }
1950
1951 /*
1952  * Called with struct se_device->aptpl_file_mutex held
1953  */
1954 static int __core_scsi3_write_aptpl_to_file(
1955         struct se_device *dev,
1956         unsigned char *buf,
1957         u32 pr_aptpl_buf_len)
1958 {
1959         struct t10_wwn *wwn = &dev->t10_wwn;
1960         struct file *file;
1961         int flags = O_RDWR | O_CREAT | O_TRUNC;
1962         char path[512];
1963         int ret;
1964
1965         memset(path, 0, 512);
1966
1967         if (strlen(&wwn->unit_serial[0]) >= 512) {
1968                 pr_err("WWN value for struct se_device does not fit"
1969                         " into path buffer\n");
1970                 return -EMSGSIZE;
1971         }
1972
1973         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1974         file = filp_open(path, flags, 0600);
1975         if (IS_ERR(file)) {
1976                 pr_err("filp_open(%s) for APTPL metadata"
1977                         " failed\n", path);
1978                 return PTR_ERR(file);
1979         }
1980
1981         if (!pr_aptpl_buf_len)
1982                 pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
1983
1984         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1985
1986         if (ret < 0)
1987                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1988         fput(file);
1989
1990         return (ret < 0) ? -EIO : 0;
1991 }
1992
1993 static int
1994 core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf,
1995                 u32 in_pr_aptpl_buf_len)
1996 {
1997         unsigned char null_buf[64], *buf;
1998         u32 pr_aptpl_buf_len;
1999         int clear_aptpl_metadata = 0;
2000         int ret;
2001
2002         /*
2003          * Can be called with a NULL pointer from PROUT service action CLEAR
2004          */
2005         if (!in_buf) {
2006                 memset(null_buf, 0, 64);
2007                 buf = &null_buf[0];
2008                 /*
2009                  * This will clear the APTPL metadata to:
2010                  * "No Registrations or Reservations" status
2011                  */
2012                 pr_aptpl_buf_len = 64;
2013                 clear_aptpl_metadata = 1;
2014         } else {
2015                 buf = in_buf;
2016                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2017         }
2018
2019         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2020                                 clear_aptpl_metadata);
2021         if (ret != 0)
2022                 return ret;
2023
2024         /*
2025          * __core_scsi3_write_aptpl_to_file() will call strlen()
2026          * on the passed buf to determine pr_aptpl_buf_len.
2027          */
2028         return __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2029 }
2030
2031 static sense_reason_t
2032 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2033                 int aptpl, int all_tg_pt, int spec_i_pt, int ignore_key)
2034 {
2035         struct se_session *se_sess = cmd->se_sess;
2036         struct se_device *dev = cmd->se_dev;
2037         struct se_dev_entry *se_deve;
2038         struct se_lun *se_lun = cmd->se_lun;
2039         struct se_portal_group *se_tpg;
2040         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2041         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2042         /* Used for APTPL metadata w/ UNREGISTER */
2043         unsigned char *pr_aptpl_buf = NULL;
2044         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2045         sense_reason_t ret = TCM_NO_SENSE;
2046         int pr_holder = 0, type;
2047
2048         if (!se_sess || !se_lun) {
2049                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2050                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2051         }
2052         se_tpg = se_sess->se_tpg;
2053         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2054
2055         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2056                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2057                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2058                                 PR_REG_ISID_LEN);
2059                 isid_ptr = &isid_buf[0];
2060         }
2061         /*
2062          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2063          */
2064         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2065         if (!pr_reg_e) {
2066                 if (res_key) {
2067                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2068                                 " for SA REGISTER, returning CONFLICT\n");
2069                         return TCM_RESERVATION_CONFLICT;
2070                 }
2071                 /*
2072                  * Do nothing but return GOOD status.
2073                  */
2074                 if (!sa_res_key)
2075                         return 0;
2076
2077                 if (!spec_i_pt) {
2078                         /*
2079                          * Perform the Service Action REGISTER on the Initiator
2080                          * Port Endpoint that the PRO was received from on the
2081                          * Logical Unit of the SCSI device server.
2082                          */
2083                         if (core_scsi3_alloc_registration(cmd->se_dev,
2084                                         se_sess->se_node_acl, se_deve, isid_ptr,
2085                                         sa_res_key, all_tg_pt, aptpl,
2086                                         ignore_key, 0)) {
2087                                 pr_err("Unable to allocate"
2088                                         " struct t10_pr_registration\n");
2089                                 return TCM_INVALID_PARAMETER_LIST;
2090                         }
2091                 } else {
2092                         /*
2093                          * Register both the Initiator port that received
2094                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2095                          * TransportID from Parameter list and loop through
2096                          * fabric dependent parameter list while calling
2097                          * logic from of core_scsi3_alloc_registration() for
2098                          * each TransportID provided SCSI Initiator Port/Device
2099                          */
2100                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2101                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2102                         if (ret != 0)
2103                                 return ret;
2104                 }
2105                 /*
2106                  * Nothing left to do for the APTPL=0 case.
2107                  */
2108                 if (!aptpl) {
2109                         pr_tmpl->pr_aptpl_active = 0;
2110                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2111                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2112                                         " REGISTER\n");
2113                         return 0;
2114                 }
2115                 /*
2116                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2117                  * update the APTPL metadata information using its
2118                  * preallocated *pr_reg->pr_aptpl_buf.
2119                  */
2120                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2121                                 se_sess->se_node_acl, se_sess);
2122
2123                 if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
2124                                 &pr_reg->pr_aptpl_buf[0],
2125                                 pr_tmpl->pr_aptpl_buf_len)) {
2126                         pr_tmpl->pr_aptpl_active = 1;
2127                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2128                 }
2129
2130                 goto out_put_pr_reg;
2131         }
2132
2133         /*
2134          * Locate the existing *pr_reg via struct se_node_acl pointers
2135          */
2136         pr_reg = pr_reg_e;
2137         type = pr_reg->pr_res_type;
2138
2139         if (!ignore_key) {
2140                 if (res_key != pr_reg->pr_res_key) {
2141                         pr_err("SPC-3 PR REGISTER: Received"
2142                                 " res_key: 0x%016Lx does not match"
2143                                 " existing SA REGISTER res_key:"
2144                                 " 0x%016Lx\n", res_key,
2145                                 pr_reg->pr_res_key);
2146                         ret = TCM_RESERVATION_CONFLICT;
2147                         goto out_put_pr_reg;
2148                 }
2149         }
2150
2151         if (spec_i_pt) {
2152                 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2153                         " set while sa_res_key=0\n");
2154                 ret = TCM_INVALID_PARAMETER_LIST;
2155                 goto out_put_pr_reg;
2156         }
2157
2158         /*
2159          * An existing ALL_TG_PT=1 registration being released
2160          * must also set ALL_TG_PT=1 in the incoming PROUT.
2161          */
2162         if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2163                 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2164                         " registration exists, but ALL_TG_PT=1 bit not"
2165                         " present in received PROUT\n");
2166                 ret = TCM_INVALID_CDB_FIELD;
2167                 goto out_put_pr_reg;
2168         }
2169
2170         /*
2171          * Allocate APTPL metadata buffer used for UNREGISTER ops
2172          */
2173         if (aptpl) {
2174                 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2175                                         GFP_KERNEL);
2176                 if (!pr_aptpl_buf) {
2177                         pr_err("Unable to allocate"
2178                                 " pr_aptpl_buf\n");
2179                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2180                         goto out_put_pr_reg;
2181                 }
2182         }
2183
2184         /*
2185          * sa_res_key=0 Unregister Reservation Key for registered I_T
2186          * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2187          * Nexus.
2188          */
2189         if (!sa_res_key) {
2190                 pr_holder = core_scsi3_check_implict_release(
2191                                 cmd->se_dev, pr_reg);
2192                 if (pr_holder < 0) {
2193                         kfree(pr_aptpl_buf);
2194                         ret = TCM_RESERVATION_CONFLICT;
2195                         goto out_put_pr_reg;
2196                 }
2197
2198                 spin_lock(&pr_tmpl->registration_lock);
2199                 /*
2200                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2201                  * and matching pr_res_key.
2202                  */
2203                 if (pr_reg->pr_reg_all_tg_pt) {
2204                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2205                                         &pr_tmpl->registration_list,
2206                                         pr_reg_list) {
2207
2208                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2209                                         continue;
2210                                 if (pr_reg_p->pr_res_key != res_key)
2211                                         continue;
2212                                 if (pr_reg == pr_reg_p)
2213                                         continue;
2214                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2215                                            pr_reg_p->pr_reg_nacl->initiatorname))
2216                                         continue;
2217
2218                                 __core_scsi3_free_registration(dev,
2219                                                 pr_reg_p, NULL, 0);
2220                         }
2221                 }
2222
2223                 /*
2224                  * Release the calling I_T Nexus registration now..
2225                  */
2226                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2227
2228                 /*
2229                  * From spc4r17, section 5.7.11.3 Unregistering
2230                  *
2231                  * If the persistent reservation is a registrants only
2232                  * type, the device server shall establish a unit
2233                  * attention condition for the initiator port associated
2234                  * with every registered I_T nexus except for the I_T
2235                  * nexus on which the PERSISTENT RESERVE OUT command was
2236                  * received, with the additional sense code set to
2237                  * RESERVATIONS RELEASED.
2238                  */
2239                 if (pr_holder &&
2240                    (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2241                     type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2242                         list_for_each_entry(pr_reg_p,
2243                                         &pr_tmpl->registration_list,
2244                                         pr_reg_list) {
2245
2246                                 core_scsi3_ua_allocate(
2247                                         pr_reg_p->pr_reg_nacl,
2248                                         pr_reg_p->pr_res_mapped_lun,
2249                                         0x2A,
2250                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2251                         }
2252                 }
2253                 spin_unlock(&pr_tmpl->registration_lock);
2254
2255                 if (!aptpl) {
2256                         pr_tmpl->pr_aptpl_active = 0;
2257                         core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2258                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2259                                         " for UNREGISTER\n");
2260                         return 0;
2261                 }
2262
2263                 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2264                                 pr_tmpl->pr_aptpl_buf_len)) {
2265                         pr_tmpl->pr_aptpl_active = 1;
2266                         pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2267                                         " for UNREGISTER\n");
2268                 }
2269
2270                 goto out_free_aptpl_buf;
2271         }
2272
2273         /*
2274          * Increment PRgeneration counter for struct se_device"
2275          * upon a successful REGISTER, see spc4r17 section 6.3.2
2276          * READ_KEYS service action.
2277          */
2278         pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2279         pr_reg->pr_res_key = sa_res_key;
2280         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2281                 " Key for %s to: 0x%016Lx PRgeneration:"
2282                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2283                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2284                 pr_reg->pr_reg_nacl->initiatorname,
2285                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2286
2287         if (!aptpl) {
2288                 pr_tmpl->pr_aptpl_active = 0;
2289                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2290                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2291                                 " for REGISTER\n");
2292                 ret = 0;
2293                 goto out_put_pr_reg;
2294         }
2295
2296         if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2297                                                 pr_tmpl->pr_aptpl_buf_len)) {
2298                 pr_tmpl->pr_aptpl_active = 1;
2299                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2300                         " for REGISTER\n");
2301         }
2302
2303 out_free_aptpl_buf:
2304         kfree(pr_aptpl_buf);
2305         ret = 0;
2306 out_put_pr_reg:
2307         core_scsi3_put_pr_reg(pr_reg);
2308         return ret;
2309 }
2310
2311 unsigned char *core_scsi3_pr_dump_type(int type)
2312 {
2313         switch (type) {
2314         case PR_TYPE_WRITE_EXCLUSIVE:
2315                 return "Write Exclusive Access";
2316         case PR_TYPE_EXCLUSIVE_ACCESS:
2317                 return "Exclusive Access";
2318         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2319                 return "Write Exclusive Access, Registrants Only";
2320         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2321                 return "Exclusive Access, Registrants Only";
2322         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2323                 return "Write Exclusive Access, All Registrants";
2324         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2325                 return "Exclusive Access, All Registrants";
2326         default:
2327                 break;
2328         }
2329
2330         return "Unknown SPC-3 PR Type";
2331 }
2332
2333 static sense_reason_t
2334 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2335 {
2336         struct se_device *dev = cmd->se_dev;
2337         struct se_session *se_sess = cmd->se_sess;
2338         struct se_lun *se_lun = cmd->se_lun;
2339         struct t10_pr_registration *pr_reg, *pr_res_holder;
2340         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2341         char i_buf[PR_REG_ISID_ID_LEN];
2342         sense_reason_t ret;
2343         int prf_isid;
2344
2345         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2346
2347         if (!se_sess || !se_lun) {
2348                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2349                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2350         }
2351         /*
2352          * Locate the existing *pr_reg via struct se_node_acl pointers
2353          */
2354         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2355                                 se_sess);
2356         if (!pr_reg) {
2357                 pr_err("SPC-3 PR: Unable to locate"
2358                         " PR_REGISTERED *pr_reg for RESERVE\n");
2359                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2360         }
2361         /*
2362          * From spc4r17 Section 5.7.9: Reserving:
2363          *
2364          * An application client creates a persistent reservation by issuing
2365          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2366          * a registered I_T nexus with the following parameters:
2367          *    a) RESERVATION KEY set to the value of the reservation key that is
2368          *       registered with the logical unit for the I_T nexus; and
2369          */
2370         if (res_key != pr_reg->pr_res_key) {
2371                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2372                         " does not match existing SA REGISTER res_key:"
2373                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2374                 ret = TCM_RESERVATION_CONFLICT;
2375                 goto out_put_pr_reg;
2376         }
2377         /*
2378          * From spc4r17 Section 5.7.9: Reserving:
2379          *
2380          * From above:
2381          *  b) TYPE field and SCOPE field set to the persistent reservation
2382          *     being created.
2383          *
2384          * Only one persistent reservation is allowed at a time per logical unit
2385          * and that persistent reservation has a scope of LU_SCOPE.
2386          */
2387         if (scope != PR_SCOPE_LU_SCOPE) {
2388                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2389                 ret = TCM_INVALID_PARAMETER_LIST;
2390                 goto out_put_pr_reg;
2391         }
2392         /*
2393          * See if we have an existing PR reservation holder pointer at
2394          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2395          * *pr_res_holder.
2396          */
2397         spin_lock(&dev->dev_reservation_lock);
2398         pr_res_holder = dev->dev_pr_res_holder;
2399         if (pr_res_holder) {
2400                 /*
2401                  * From spc4r17 Section 5.7.9: Reserving:
2402                  *
2403                  * If the device server receives a PERSISTENT RESERVE OUT
2404                  * command from an I_T nexus other than a persistent reservation
2405                  * holder (see 5.7.10) that attempts to create a persistent
2406                  * reservation when a persistent reservation already exists for
2407                  * the logical unit, then the command shall be completed with
2408                  * RESERVATION CONFLICT status.
2409                  */
2410                 if (pr_res_holder != pr_reg) {
2411                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2412                         pr_err("SPC-3 PR: Attempted RESERVE from"
2413                                 " [%s]: %s while reservation already held by"
2414                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2415                                 cmd->se_tfo->get_fabric_name(),
2416                                 se_sess->se_node_acl->initiatorname,
2417                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2418                                 pr_res_holder->pr_reg_nacl->initiatorname);
2419
2420                         spin_unlock(&dev->dev_reservation_lock);
2421                         ret = TCM_RESERVATION_CONFLICT;
2422                         goto out_put_pr_reg;
2423                 }
2424                 /*
2425                  * From spc4r17 Section 5.7.9: Reserving:
2426                  *
2427                  * If a persistent reservation holder attempts to modify the
2428                  * type or scope of an existing persistent reservation, the
2429                  * command shall be completed with RESERVATION CONFLICT status.
2430                  */
2431                 if ((pr_res_holder->pr_res_type != type) ||
2432                     (pr_res_holder->pr_res_scope != scope)) {
2433                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2434                         pr_err("SPC-3 PR: Attempted RESERVE from"
2435                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2436                                 " while reservation already held by [%s]: %s,"
2437                                 " returning RESERVATION_CONFLICT\n",
2438                                 cmd->se_tfo->get_fabric_name(),
2439                                 se_sess->se_node_acl->initiatorname,
2440                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2441                                 pr_res_holder->pr_reg_nacl->initiatorname);
2442
2443                         spin_unlock(&dev->dev_reservation_lock);
2444                         ret = TCM_RESERVATION_CONFLICT;
2445                         goto out_put_pr_reg;
2446                 }
2447                 /*
2448                  * From spc4r17 Section 5.7.9: Reserving:
2449                  *
2450                  * If the device server receives a PERSISTENT RESERVE OUT
2451                  * command with RESERVE service action where the TYPE field and
2452                  * the SCOPE field contain the same values as the existing type
2453                  * and scope from a persistent reservation holder, it shall not
2454                  * make any change to the existing persistent reservation and
2455                  * shall completethe command with GOOD status.
2456                  */
2457                 spin_unlock(&dev->dev_reservation_lock);
2458                 ret = 0;
2459                 goto out_put_pr_reg;
2460         }
2461         /*
2462          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2463          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2464          */
2465         pr_reg->pr_res_scope = scope;
2466         pr_reg->pr_res_type = type;
2467         pr_reg->pr_res_holder = 1;
2468         dev->dev_pr_res_holder = pr_reg;
2469         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2470                                 PR_REG_ISID_ID_LEN);
2471
2472         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2473                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2474                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2475                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2476         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2477                         cmd->se_tfo->get_fabric_name(),
2478                         se_sess->se_node_acl->initiatorname,
2479                         (prf_isid) ? &i_buf[0] : "");
2480         spin_unlock(&dev->dev_reservation_lock);
2481
2482         if (pr_tmpl->pr_aptpl_active) {
2483                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2484                                 &pr_reg->pr_aptpl_buf[0],
2485                                 pr_tmpl->pr_aptpl_buf_len)) {
2486                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2487                                         " for RESERVE\n");
2488                 }
2489         }
2490
2491         ret = 0;
2492 out_put_pr_reg:
2493         core_scsi3_put_pr_reg(pr_reg);
2494         return ret;
2495 }
2496
2497 static sense_reason_t
2498 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2499                 u64 res_key)
2500 {
2501         switch (type) {
2502         case PR_TYPE_WRITE_EXCLUSIVE:
2503         case PR_TYPE_EXCLUSIVE_ACCESS:
2504         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2505         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2506         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2507         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2508                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2509         default:
2510                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2511                         " 0x%02x\n", type);
2512                 return TCM_INVALID_CDB_FIELD;
2513         }
2514 }
2515
2516 /*
2517  * Called with struct se_device->dev_reservation_lock held.
2518  */
2519 static void __core_scsi3_complete_pro_release(
2520         struct se_device *dev,
2521         struct se_node_acl *se_nacl,
2522         struct t10_pr_registration *pr_reg,
2523         int explict)
2524 {
2525         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2526         char i_buf[PR_REG_ISID_ID_LEN];
2527         int prf_isid;
2528
2529         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2530         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2531                                 PR_REG_ISID_ID_LEN);
2532         /*
2533          * Go ahead and release the current PR reservation holder.
2534          */
2535         dev->dev_pr_res_holder = NULL;
2536
2537         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2538                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2539                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2540                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2541                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2542         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2543                 tfo->get_fabric_name(), se_nacl->initiatorname,
2544                 (prf_isid) ? &i_buf[0] : "");
2545         /*
2546          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2547          */
2548         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2549 }
2550
2551 static sense_reason_t
2552 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2553                 u64 res_key)
2554 {
2555         struct se_device *dev = cmd->se_dev;
2556         struct se_session *se_sess = cmd->se_sess;
2557         struct se_lun *se_lun = cmd->se_lun;
2558         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2559         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2560         int all_reg = 0;
2561         sense_reason_t ret = 0;
2562
2563         if (!se_sess || !se_lun) {
2564                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2565                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2566         }
2567         /*
2568          * Locate the existing *pr_reg via struct se_node_acl pointers
2569          */
2570         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2571         if (!pr_reg) {
2572                 pr_err("SPC-3 PR: Unable to locate"
2573                         " PR_REGISTERED *pr_reg for RELEASE\n");
2574                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2575         }
2576         /*
2577          * From spc4r17 Section 5.7.11.2 Releasing:
2578          *
2579          * If there is no persistent reservation or in response to a persistent
2580          * reservation release request from a registered I_T nexus that is not a
2581          * persistent reservation holder (see 5.7.10), the device server shall
2582          * do the following:
2583          *
2584          *     a) Not release the persistent reservation, if any;
2585          *     b) Not remove any registrations; and
2586          *     c) Complete the command with GOOD status.
2587          */
2588         spin_lock(&dev->dev_reservation_lock);
2589         pr_res_holder = dev->dev_pr_res_holder;
2590         if (!pr_res_holder) {
2591                 /*
2592                  * No persistent reservation, return GOOD status.
2593                  */
2594                 spin_unlock(&dev->dev_reservation_lock);
2595                 goto out_put_pr_reg;
2596         }
2597         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2598             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2599                 all_reg = 1;
2600
2601         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2602                 /*
2603                  * Non 'All Registrants' PR Type cases..
2604                  * Release request from a registered I_T nexus that is not a
2605                  * persistent reservation holder. return GOOD status.
2606                  */
2607                 spin_unlock(&dev->dev_reservation_lock);
2608                 goto out_put_pr_reg;
2609         }
2610
2611         /*
2612          * From spc4r17 Section 5.7.11.2 Releasing:
2613          *
2614          * Only the persistent reservation holder (see 5.7.10) is allowed to
2615          * release a persistent reservation.
2616          *
2617          * An application client releases the persistent reservation by issuing
2618          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2619          * an I_T nexus that is a persistent reservation holder with the
2620          * following parameters:
2621          *
2622          *     a) RESERVATION KEY field set to the value of the reservation key
2623          *        that is registered with the logical unit for the I_T nexus;
2624          */
2625         if (res_key != pr_reg->pr_res_key) {
2626                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2627                         " does not match existing SA REGISTER res_key:"
2628                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2629                 spin_unlock(&dev->dev_reservation_lock);
2630                 ret = TCM_RESERVATION_CONFLICT;
2631                 goto out_put_pr_reg;
2632         }
2633         /*
2634          * From spc4r17 Section 5.7.11.2 Releasing and above:
2635          *
2636          * b) TYPE field and SCOPE field set to match the persistent
2637          *    reservation being released.
2638          */
2639         if ((pr_res_holder->pr_res_type != type) ||
2640             (pr_res_holder->pr_res_scope != scope)) {
2641                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2642                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2643                         " reservation from [%s]: %s with different TYPE "
2644                         "and/or SCOPE  while reservation already held by"
2645                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2646                         cmd->se_tfo->get_fabric_name(),
2647                         se_sess->se_node_acl->initiatorname,
2648                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2649                         pr_res_holder->pr_reg_nacl->initiatorname);
2650
2651                 spin_unlock(&dev->dev_reservation_lock);
2652                 ret = TCM_RESERVATION_CONFLICT;
2653                 goto out_put_pr_reg;
2654         }
2655         /*
2656          * In response to a persistent reservation release request from the
2657          * persistent reservation holder the device server shall perform a
2658          * release by doing the following as an uninterrupted series of actions:
2659          * a) Release the persistent reservation;
2660          * b) Not remove any registration(s);
2661          * c) If the released persistent reservation is a registrants only type
2662          * or all registrants type persistent reservation,
2663          *    the device server shall establish a unit attention condition for
2664          *    the initiator port associated with every regis-
2665          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2666          *    RESERVE OUT command with RELEASE service action was received,
2667          *    with the additional sense code set to RESERVATIONS RELEASED; and
2668          * d) If the persistent reservation is of any other type, the device
2669          *    server shall not establish a unit attention condition.
2670          */
2671         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2672                         pr_reg, 1);
2673
2674         spin_unlock(&dev->dev_reservation_lock);
2675
2676         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2677             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2678             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2679             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2680                 /*
2681                  * If no UNIT ATTENTION conditions will be established for
2682                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2683                  * go ahead and check for APTPL=1 update+write below
2684                  */
2685                 goto write_aptpl;
2686         }
2687
2688         spin_lock(&pr_tmpl->registration_lock);
2689         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2690                         pr_reg_list) {
2691                 /*
2692                  * Do not establish a UNIT ATTENTION condition
2693                  * for the calling I_T Nexus
2694                  */
2695                 if (pr_reg_p == pr_reg)
2696                         continue;
2697
2698                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2699                                 pr_reg_p->pr_res_mapped_lun,
2700                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2701         }
2702         spin_unlock(&pr_tmpl->registration_lock);
2703
2704 write_aptpl:
2705         if (pr_tmpl->pr_aptpl_active) {
2706                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2707                         &pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) {
2708                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2709                 }
2710         }
2711 out_put_pr_reg:
2712         core_scsi3_put_pr_reg(pr_reg);
2713         return ret;
2714 }
2715
2716 static sense_reason_t
2717 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2718 {
2719         struct se_device *dev = cmd->se_dev;
2720         struct se_node_acl *pr_reg_nacl;
2721         struct se_session *se_sess = cmd->se_sess;
2722         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2723         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2724         u32 pr_res_mapped_lun = 0;
2725         int calling_it_nexus = 0;
2726         /*
2727          * Locate the existing *pr_reg via struct se_node_acl pointers
2728          */
2729         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2730                         se_sess->se_node_acl, se_sess);
2731         if (!pr_reg_n) {
2732                 pr_err("SPC-3 PR: Unable to locate"
2733                         " PR_REGISTERED *pr_reg for CLEAR\n");
2734                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2735         }
2736         /*
2737          * From spc4r17 section 5.7.11.6, Clearing:
2738          *
2739          * Any application client may release the persistent reservation and
2740          * remove all registrations from a device server by issuing a
2741          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2742          * registered I_T nexus with the following parameter:
2743          *
2744          *      a) RESERVATION KEY field set to the value of the reservation key
2745          *         that is registered with the logical unit for the I_T nexus.
2746          */
2747         if (res_key != pr_reg_n->pr_res_key) {
2748                 pr_err("SPC-3 PR REGISTER: Received"
2749                         " res_key: 0x%016Lx does not match"
2750                         " existing SA REGISTER res_key:"
2751                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2752                 core_scsi3_put_pr_reg(pr_reg_n);
2753                 return TCM_RESERVATION_CONFLICT;
2754         }
2755         /*
2756          * a) Release the persistent reservation, if any;
2757          */
2758         spin_lock(&dev->dev_reservation_lock);
2759         pr_res_holder = dev->dev_pr_res_holder;
2760         if (pr_res_holder) {
2761                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2762                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2763                         pr_res_holder, 0);
2764         }
2765         spin_unlock(&dev->dev_reservation_lock);
2766         /*
2767          * b) Remove all registration(s) (see spc4r17 5.7.7);
2768          */
2769         spin_lock(&pr_tmpl->registration_lock);
2770         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2771                         &pr_tmpl->registration_list, pr_reg_list) {
2772
2773                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2774                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2775                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2776                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2777                                         calling_it_nexus);
2778                 /*
2779                  * e) Establish a unit attention condition for the initiator
2780                  *    port associated with every registered I_T nexus other
2781                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2782                  *    command with CLEAR service action was received, with the
2783                  *    additional sense code set to RESERVATIONS PREEMPTED.
2784                  */
2785                 if (!calling_it_nexus)
2786                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2787                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2788         }
2789         spin_unlock(&pr_tmpl->registration_lock);
2790
2791         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2792                 cmd->se_tfo->get_fabric_name());
2793
2794         if (pr_tmpl->pr_aptpl_active) {
2795                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2796                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2797                                 " for CLEAR\n");
2798         }
2799
2800         core_scsi3_pr_generation(dev);
2801         return 0;
2802 }
2803
2804 /*
2805  * Called with struct se_device->dev_reservation_lock held.
2806  */
2807 static void __core_scsi3_complete_pro_preempt(
2808         struct se_device *dev,
2809         struct t10_pr_registration *pr_reg,
2810         struct list_head *preempt_and_abort_list,
2811         int type,
2812         int scope,
2813         int abort)
2814 {
2815         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2816         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2817         char i_buf[PR_REG_ISID_ID_LEN];
2818         int prf_isid;
2819
2820         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2821         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2822                                 PR_REG_ISID_ID_LEN);
2823         /*
2824          * Do an implict RELEASE of the existing reservation.
2825          */
2826         if (dev->dev_pr_res_holder)
2827                 __core_scsi3_complete_pro_release(dev, nacl,
2828                                 dev->dev_pr_res_holder, 0);
2829
2830         dev->dev_pr_res_holder = pr_reg;
2831         pr_reg->pr_res_holder = 1;
2832         pr_reg->pr_res_type = type;
2833         pr_reg->pr_res_scope = scope;
2834
2835         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2836                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2837                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2838                 core_scsi3_pr_dump_type(type),
2839                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2840         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2841                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2842                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2843         /*
2844          * For PREEMPT_AND_ABORT, add the preempting reservation's
2845          * struct t10_pr_registration to the list that will be compared
2846          * against received CDBs..
2847          */
2848         if (preempt_and_abort_list)
2849                 list_add_tail(&pr_reg->pr_reg_abort_list,
2850                                 preempt_and_abort_list);
2851 }
2852
2853 static void core_scsi3_release_preempt_and_abort(
2854         struct list_head *preempt_and_abort_list,
2855         struct t10_pr_registration *pr_reg_holder)
2856 {
2857         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2858
2859         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2860                                 pr_reg_abort_list) {
2861
2862                 list_del(&pr_reg->pr_reg_abort_list);
2863                 if (pr_reg_holder == pr_reg)
2864                         continue;
2865                 if (pr_reg->pr_res_holder) {
2866                         pr_warn("pr_reg->pr_res_holder still set\n");
2867                         continue;
2868                 }
2869
2870                 pr_reg->pr_reg_deve = NULL;
2871                 pr_reg->pr_reg_nacl = NULL;
2872                 kfree(pr_reg->pr_aptpl_buf);
2873                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2874         }
2875 }
2876
2877 static sense_reason_t
2878 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2879                 u64 sa_res_key, int abort)
2880 {
2881         struct se_device *dev = cmd->se_dev;
2882         struct se_node_acl *pr_reg_nacl;
2883         struct se_session *se_sess = cmd->se_sess;
2884         LIST_HEAD(preempt_and_abort_list);
2885         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2886         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2887         u32 pr_res_mapped_lun = 0;
2888         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2889         int prh_type = 0, prh_scope = 0;
2890
2891         if (!se_sess)
2892                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2893
2894         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2895                                 se_sess);
2896         if (!pr_reg_n) {
2897                 pr_err("SPC-3 PR: Unable to locate"
2898                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2899                         (abort) ? "_AND_ABORT" : "");
2900                 return TCM_RESERVATION_CONFLICT;
2901         }
2902         if (pr_reg_n->pr_res_key != res_key) {
2903                 core_scsi3_put_pr_reg(pr_reg_n);
2904                 return TCM_RESERVATION_CONFLICT;
2905         }
2906         if (scope != PR_SCOPE_LU_SCOPE) {
2907                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2908                 core_scsi3_put_pr_reg(pr_reg_n);
2909                 return TCM_INVALID_PARAMETER_LIST;
2910         }
2911
2912         spin_lock(&dev->dev_reservation_lock);
2913         pr_res_holder = dev->dev_pr_res_holder;
2914         if (pr_res_holder &&
2915            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2916             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2917                 all_reg = 1;
2918
2919         if (!all_reg && !sa_res_key) {
2920                 spin_unlock(&dev->dev_reservation_lock);
2921                 core_scsi3_put_pr_reg(pr_reg_n);
2922                 return TCM_INVALID_PARAMETER_LIST;
2923         }
2924         /*
2925          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2926          *
2927          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2928          * persistent reservation holder or there is no persistent reservation
2929          * holder (i.e., there is no persistent reservation), then the device
2930          * server shall perform a preempt by doing the following in an
2931          * uninterrupted series of actions. (See below..)
2932          */
2933         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2934                 /*
2935                  * No existing or SA Reservation Key matching reservations..
2936                  *
2937                  * PROUT SA PREEMPT with All Registrant type reservations are
2938                  * allowed to be processed without a matching SA Reservation Key
2939                  */
2940                 spin_lock(&pr_tmpl->registration_lock);
2941                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2942                                 &pr_tmpl->registration_list, pr_reg_list) {
2943                         /*
2944                          * Removing of registrations in non all registrants
2945                          * type reservations without a matching SA reservation
2946                          * key.
2947                          *
2948                          * a) Remove the registrations for all I_T nexuses
2949                          *    specified by the SERVICE ACTION RESERVATION KEY
2950                          *    field;
2951                          * b) Ignore the contents of the SCOPE and TYPE fields;
2952                          * c) Process tasks as defined in 5.7.1; and
2953                          * d) Establish a unit attention condition for the
2954                          *    initiator port associated with every I_T nexus
2955                          *    that lost its registration other than the I_T
2956                          *    nexus on which the PERSISTENT RESERVE OUT command
2957                          *    was received, with the additional sense code set
2958                          *    to REGISTRATIONS PREEMPTED.
2959                          */
2960                         if (!all_reg) {
2961                                 if (pr_reg->pr_res_key != sa_res_key)
2962                                         continue;
2963
2964                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2965                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2966                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2967                                 __core_scsi3_free_registration(dev, pr_reg,
2968                                         (abort) ? &preempt_and_abort_list :
2969                                                 NULL, calling_it_nexus);
2970                                 released_regs++;
2971                         } else {
2972                                 /*
2973                                  * Case for any existing all registrants type
2974                                  * reservation, follow logic in spc4r17 section
2975                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2976                                  *
2977                                  * For a ZERO SA Reservation key, release
2978                                  * all other registrations and do an implict
2979                                  * release of active persistent reservation.
2980                                  *
2981                                  * For a non-ZERO SA Reservation key, only
2982                                  * release the matching reservation key from
2983                                  * registrations.
2984                                  */
2985                                 if ((sa_res_key) &&
2986                                      (pr_reg->pr_res_key != sa_res_key))
2987                                         continue;
2988
2989                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2990                                 if (calling_it_nexus)
2991                                         continue;
2992
2993                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2994                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2995                                 __core_scsi3_free_registration(dev, pr_reg,
2996                                         (abort) ? &preempt_and_abort_list :
2997                                                 NULL, 0);
2998                                 released_regs++;
2999                         }
3000                         if (!calling_it_nexus)
3001                                 core_scsi3_ua_allocate(pr_reg_nacl,
3002                                         pr_res_mapped_lun, 0x2A,
3003                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3004                 }
3005                 spin_unlock(&pr_tmpl->registration_lock);
3006                 /*
3007                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3008                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3009                  * RESERVATION KEY field to a value that does not match any
3010                  * registered reservation key, then the device server shall
3011                  * complete the command with RESERVATION CONFLICT status.
3012                  */
3013                 if (!released_regs) {
3014                         spin_unlock(&dev->dev_reservation_lock);
3015                         core_scsi3_put_pr_reg(pr_reg_n);
3016                         return TCM_RESERVATION_CONFLICT;
3017                 }
3018                 /*
3019                  * For an existing all registrants type reservation
3020                  * with a zero SA rservation key, preempt the existing
3021                  * reservation with the new PR type and scope.
3022                  */
3023                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3024                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3025                                 (abort) ? &preempt_and_abort_list : NULL,
3026                                 type, scope, abort);
3027
3028                         if (abort)
3029                                 core_scsi3_release_preempt_and_abort(
3030                                         &preempt_and_abort_list, pr_reg_n);
3031                 }
3032                 spin_unlock(&dev->dev_reservation_lock);
3033
3034                 if (pr_tmpl->pr_aptpl_active) {
3035                         if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3036                                         &pr_reg_n->pr_aptpl_buf[0],
3037                                         pr_tmpl->pr_aptpl_buf_len)) {
3038                                 pr_debug("SPC-3 PR: Updated APTPL"
3039                                         " metadata for  PREEMPT%s\n", (abort) ?
3040                                         "_AND_ABORT" : "");
3041                         }
3042                 }
3043
3044                 core_scsi3_put_pr_reg(pr_reg_n);
3045                 core_scsi3_pr_generation(cmd->se_dev);
3046                 return 0;
3047         }
3048         /*
3049          * The PREEMPTing SA reservation key matches that of the
3050          * existing persistent reservation, first, we check if
3051          * we are preempting our own reservation.
3052          * From spc4r17, section 5.7.11.4.3 Preempting
3053          * persistent reservations and registration handling
3054          *
3055          * If an all registrants persistent reservation is not
3056          * present, it is not an error for the persistent
3057          * reservation holder to preempt itself (i.e., a
3058          * PERSISTENT RESERVE OUT with a PREEMPT service action
3059          * or a PREEMPT AND ABORT service action with the
3060          * SERVICE ACTION RESERVATION KEY value equal to the
3061          * persistent reservation holder's reservation key that
3062          * is received from the persistent reservation holder).
3063          * In that case, the device server shall establish the
3064          * new persistent reservation and maintain the
3065          * registration.
3066          */
3067         prh_type = pr_res_holder->pr_res_type;
3068         prh_scope = pr_res_holder->pr_res_scope;
3069         /*
3070          * If the SERVICE ACTION RESERVATION KEY field identifies a
3071          * persistent reservation holder (see 5.7.10), the device
3072          * server shall perform a preempt by doing the following as
3073          * an uninterrupted series of actions:
3074          *
3075          * a) Release the persistent reservation for the holder
3076          *    identified by the SERVICE ACTION RESERVATION KEY field;
3077          */
3078         if (pr_reg_n != pr_res_holder)
3079                 __core_scsi3_complete_pro_release(dev,
3080                                 pr_res_holder->pr_reg_nacl,
3081                                 dev->dev_pr_res_holder, 0);
3082         /*
3083          * b) Remove the registrations for all I_T nexuses identified
3084          *    by the SERVICE ACTION RESERVATION KEY field, except the
3085          *    I_T nexus that is being used for the PERSISTENT RESERVE
3086          *    OUT command. If an all registrants persistent reservation
3087          *    is present and the SERVICE ACTION RESERVATION KEY field
3088          *    is set to zero, then all registrations shall be removed
3089          *    except for that of the I_T nexus that is being used for
3090          *    the PERSISTENT RESERVE OUT command;
3091          */
3092         spin_lock(&pr_tmpl->registration_lock);
3093         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3094                         &pr_tmpl->registration_list, pr_reg_list) {
3095
3096                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3097                 if (calling_it_nexus)
3098                         continue;
3099
3100                 if (pr_reg->pr_res_key != sa_res_key)
3101                         continue;
3102
3103                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3104                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3105                 __core_scsi3_free_registration(dev, pr_reg,
3106                                 (abort) ? &preempt_and_abort_list : NULL,
3107                                 calling_it_nexus);
3108                 /*
3109                  * e) Establish a unit attention condition for the initiator
3110                  *    port associated with every I_T nexus that lost its
3111                  *    persistent reservation and/or registration, with the
3112                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3113                  */
3114                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3115                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3116         }
3117         spin_unlock(&pr_tmpl->registration_lock);
3118         /*
3119          * c) Establish a persistent reservation for the preempting
3120          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3121          */
3122         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3123                         (abort) ? &preempt_and_abort_list : NULL,
3124                         type, scope, abort);
3125         /*
3126          * d) Process tasks as defined in 5.7.1;
3127          * e) See above..
3128          * f) If the type or scope has changed, then for every I_T nexus
3129          *    whose reservation key was not removed, except for the I_T
3130          *    nexus on which the PERSISTENT RESERVE OUT command was
3131          *    received, the device server shall establish a unit
3132          *    attention condition for the initiator port associated with
3133          *    that I_T nexus, with the additional sense code set to
3134          *    RESERVATIONS RELEASED. If the type or scope have not
3135          *    changed, then no unit attention condition(s) shall be
3136          *    established for this reason.
3137          */
3138         if ((prh_type != type) || (prh_scope != scope)) {
3139                 spin_lock(&pr_tmpl->registration_lock);
3140                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3141                                 &pr_tmpl->registration_list, pr_reg_list) {
3142
3143                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3144                         if (calling_it_nexus)
3145                                 continue;
3146
3147                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3148                                         pr_reg->pr_res_mapped_lun, 0x2A,
3149                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3150                 }
3151                 spin_unlock(&pr_tmpl->registration_lock);
3152         }
3153         spin_unlock(&dev->dev_reservation_lock);
3154         /*
3155          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3156          * All received CDBs for the matching existing reservation and
3157          * registrations undergo ABORT_TASK logic.
3158          *
3159          * From there, core_scsi3_release_preempt_and_abort() will
3160          * release every registration in the list (which have already
3161          * been removed from the primary pr_reg list), except the
3162          * new persistent reservation holder, the calling Initiator Port.
3163          */
3164         if (abort) {
3165                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3166                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3167                                                 pr_reg_n);
3168         }
3169
3170         if (pr_tmpl->pr_aptpl_active) {
3171                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3172                                 &pr_reg_n->pr_aptpl_buf[0],
3173                                 pr_tmpl->pr_aptpl_buf_len)) {
3174                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3175                                 "%s\n", abort ? "_AND_ABORT" : "");
3176                 }
3177         }
3178
3179         core_scsi3_put_pr_reg(pr_reg_n);
3180         core_scsi3_pr_generation(cmd->se_dev);
3181         return 0;
3182 }
3183
3184 static sense_reason_t
3185 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3186                 u64 res_key, u64 sa_res_key, int abort)
3187 {
3188         switch (type) {
3189         case PR_TYPE_WRITE_EXCLUSIVE:
3190         case PR_TYPE_EXCLUSIVE_ACCESS:
3191         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3192         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3193         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3194         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3195                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3196                                               sa_res_key, abort);
3197         default:
3198                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3199                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3200                 return TCM_INVALID_CDB_FIELD;
3201         }
3202 }
3203
3204
3205 static sense_reason_t
3206 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3207                 u64 sa_res_key, int aptpl, int unreg)
3208 {
3209         struct se_session *se_sess = cmd->se_sess;
3210         struct se_device *dev = cmd->se_dev;
3211         struct se_dev_entry *dest_se_deve = NULL;
3212         struct se_lun *se_lun = cmd->se_lun;
3213         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3214         struct se_port *se_port;
3215         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3216         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3217         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3218         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3219         unsigned char *buf;
3220         unsigned char *initiator_str;
3221         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3222         u32 tid_len, tmp_tid_len;
3223         int new_reg = 0, type, scope, matching_iname, prf_isid;
3224         sense_reason_t ret;
3225         unsigned short rtpi;
3226         unsigned char proto_ident;
3227
3228         if (!se_sess || !se_lun) {
3229                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3230                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3231         }
3232
3233         memset(dest_iport, 0, 64);
3234         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3235         se_tpg = se_sess->se_tpg;
3236         tf_ops = se_tpg->se_tpg_tfo;
3237         /*
3238          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3239          *      Register behaviors for a REGISTER AND MOVE service action
3240          *
3241          * Locate the existing *pr_reg via struct se_node_acl pointers
3242          */
3243         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3244                                 se_sess);
3245         if (!pr_reg) {
3246                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3247                         " *pr_reg for REGISTER_AND_MOVE\n");
3248                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3249         }
3250         /*
3251          * The provided reservation key much match the existing reservation key
3252          * provided during this initiator's I_T nexus registration.
3253          */
3254         if (res_key != pr_reg->pr_res_key) {
3255                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3256                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3257                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3258                 ret = TCM_RESERVATION_CONFLICT;
3259                 goto out_put_pr_reg;
3260         }
3261         /*
3262          * The service active reservation key needs to be non zero
3263          */
3264         if (!sa_res_key) {
3265                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3266                         " sa_res_key\n");
3267                 ret = TCM_INVALID_PARAMETER_LIST;
3268                 goto out_put_pr_reg;
3269         }
3270
3271         /*
3272          * Determine the Relative Target Port Identifier where the reservation
3273          * will be moved to for the TransportID containing SCSI initiator WWN
3274          * information.
3275          */
3276         buf = transport_kmap_data_sg(cmd);
3277         if (!buf) {
3278                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3279                 goto out_put_pr_reg;
3280         }
3281
3282         rtpi = (buf[18] & 0xff) << 8;
3283         rtpi |= buf[19] & 0xff;
3284         tid_len = (buf[20] & 0xff) << 24;
3285         tid_len |= (buf[21] & 0xff) << 16;
3286         tid_len |= (buf[22] & 0xff) << 8;
3287         tid_len |= buf[23] & 0xff;
3288         transport_kunmap_data_sg(cmd);
3289         buf = NULL;
3290
3291         if ((tid_len + 24) != cmd->data_length) {
3292                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3293                         " does not equal CDB data_length: %u\n", tid_len,
3294                         cmd->data_length);
3295                 ret = TCM_INVALID_PARAMETER_LIST;
3296                 goto out_put_pr_reg;
3297         }
3298
3299         spin_lock(&dev->se_port_lock);
3300         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3301                 if (se_port->sep_rtpi != rtpi)
3302                         continue;
3303                 dest_se_tpg = se_port->sep_tpg;
3304                 if (!dest_se_tpg)
3305                         continue;
3306                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3307                 if (!dest_tf_ops)
3308                         continue;
3309
3310                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3311                 smp_mb__after_atomic_inc();
3312                 spin_unlock(&dev->se_port_lock);
3313
3314                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3315                         pr_err("core_scsi3_tpg_depend_item() failed"
3316                                 " for dest_se_tpg\n");
3317                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3318                         smp_mb__after_atomic_dec();
3319                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3320                         goto out_put_pr_reg;
3321                 }
3322
3323                 spin_lock(&dev->se_port_lock);
3324                 break;
3325         }
3326         spin_unlock(&dev->se_port_lock);
3327
3328         if (!dest_se_tpg || !dest_tf_ops) {
3329                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3330                         " fabric ops from Relative Target Port Identifier:"
3331                         " %hu\n", rtpi);
3332                 ret = TCM_INVALID_PARAMETER_LIST;
3333                 goto out_put_pr_reg;
3334         }
3335
3336         buf = transport_kmap_data_sg(cmd);
3337         if (!buf) {
3338                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3339                 goto out_put_pr_reg;
3340         }
3341         proto_ident = (buf[24] & 0x0f);
3342
3343         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3344                         " 0x%02x\n", proto_ident);
3345
3346         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3347                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3348                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3349                         " from fabric: %s\n", proto_ident,
3350                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3351                         dest_tf_ops->get_fabric_name());
3352                 ret = TCM_INVALID_PARAMETER_LIST;
3353                 goto out;
3354         }
3355         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3356                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3357                         " containg a valid tpg_parse_pr_out_transport_id"
3358                         " function pointer\n");
3359                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3360                 goto out;
3361         }
3362         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3363                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3364         if (!initiator_str) {
3365                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3366                         " initiator_str from Transport ID\n");
3367                 ret = TCM_INVALID_PARAMETER_LIST;
3368                 goto out;
3369         }
3370
3371         transport_kunmap_data_sg(cmd);
3372         buf = NULL;
3373
3374         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3375                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3376                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3377                 iport_ptr : "");
3378         /*
3379          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3380          * action specifies a TransportID that is the same as the initiator port
3381          * of the I_T nexus for the command received, then the command shall
3382          * be terminated with CHECK CONDITION status, with the sense key set to
3383          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3384          * IN PARAMETER LIST.
3385          */
3386         pr_reg_nacl = pr_reg->pr_reg_nacl;
3387         matching_iname = (!strcmp(initiator_str,
3388                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3389         if (!matching_iname)
3390                 goto after_iport_check;
3391
3392         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3393                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3394                         " matches: %s on received I_T Nexus\n", initiator_str,
3395                         pr_reg_nacl->initiatorname);
3396                 ret = TCM_INVALID_PARAMETER_LIST;
3397                 goto out;
3398         }
3399         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3400                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3401                         " matches: %s %s on received I_T Nexus\n",
3402                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3403                         pr_reg->pr_reg_isid);
3404                 ret = TCM_INVALID_PARAMETER_LIST;
3405                 goto out;
3406         }
3407 after_iport_check:
3408         /*
3409          * Locate the destination struct se_node_acl from the received Transport ID
3410          */
3411         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3412         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3413                                 initiator_str);
3414         if (dest_node_acl) {
3415                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3416                 smp_mb__after_atomic_inc();
3417         }
3418         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3419
3420         if (!dest_node_acl) {
3421                 pr_err("Unable to locate %s dest_node_acl for"
3422                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3423                         initiator_str);
3424                 ret = TCM_INVALID_PARAMETER_LIST;
3425                 goto out;
3426         }
3427
3428         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3429                 pr_err("core_scsi3_nodeacl_depend_item() for"
3430                         " dest_node_acl\n");
3431                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3432                 smp_mb__after_atomic_dec();
3433                 dest_node_acl = NULL;
3434                 ret = TCM_INVALID_PARAMETER_LIST;
3435                 goto out;
3436         }
3437
3438         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3439                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3440                 dest_node_acl->initiatorname);
3441
3442         /*
3443          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3444          * PORT IDENTIFIER.
3445          */
3446         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3447         if (!dest_se_deve) {
3448                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3449                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3450                 ret = TCM_INVALID_PARAMETER_LIST;
3451                 goto out;
3452         }
3453
3454         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3455                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3456                 atomic_dec(&dest_se_deve->pr_ref_count);
3457                 smp_mb__after_atomic_dec();
3458                 dest_se_deve = NULL;
3459                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3460                 goto out;
3461         }
3462
3463         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3464                 " ACL for dest_se_deve->mapped_lun: %u\n",
3465                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3466                 dest_se_deve->mapped_lun);
3467
3468         /*
3469          * A persistent reservation needs to already existing in order to
3470          * successfully complete the REGISTER_AND_MOVE service action..
3471          */
3472         spin_lock(&dev->dev_reservation_lock);
3473         pr_res_holder = dev->dev_pr_res_holder;
3474         if (!pr_res_holder) {
3475                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3476                         " currently held\n");
3477                 spin_unlock(&dev->dev_reservation_lock);
3478                 ret = TCM_INVALID_CDB_FIELD;
3479                 goto out;
3480         }
3481         /*
3482          * The received on I_T Nexus must be the reservation holder.
3483          *
3484          * From spc4r17 section 5.7.8  Table 50 --
3485          *      Register behaviors for a REGISTER AND MOVE service action
3486          */
3487         if (pr_res_holder != pr_reg) {
3488                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3489                         " Nexus is not reservation holder\n");
3490                 spin_unlock(&dev->dev_reservation_lock);
3491                 ret = TCM_RESERVATION_CONFLICT;
3492                 goto out;
3493         }
3494         /*
3495          * From spc4r17 section 5.7.8: registering and moving reservation
3496          *
3497          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3498          * action is received and the established persistent reservation is a
3499          * Write Exclusive - All Registrants type or Exclusive Access -
3500          * All Registrants type reservation, then the command shall be completed
3501          * with RESERVATION CONFLICT status.
3502          */
3503         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3504             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3505                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3506                         " reservation for type: %s\n",
3507                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3508                 spin_unlock(&dev->dev_reservation_lock);
3509                 ret = TCM_RESERVATION_CONFLICT;
3510                 goto out;
3511         }
3512         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3513         /*
3514          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3515          */
3516         type = pr_res_holder->pr_res_type;
3517         scope = pr_res_holder->pr_res_type;
3518         /*
3519          * c) Associate the reservation key specified in the SERVICE ACTION
3520          *    RESERVATION KEY field with the I_T nexus specified as the
3521          *    destination of the register and move, where:
3522          *    A) The I_T nexus is specified by the TransportID and the
3523          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3524          *    B) Regardless of the TransportID format used, the association for
3525          *       the initiator port is based on either the initiator port name
3526          *       (see 3.1.71) on SCSI transport protocols where port names are
3527          *       required or the initiator port identifier (see 3.1.70) on SCSI
3528          *       transport protocols where port names are not required;
3529          * d) Register the reservation key specified in the SERVICE ACTION
3530          *    RESERVATION KEY field;
3531          * e) Retain the reservation key specified in the SERVICE ACTION
3532          *    RESERVATION KEY field and associated information;
3533          *
3534          * Also, It is not an error for a REGISTER AND MOVE service action to
3535          * register an I_T nexus that is already registered with the same
3536          * reservation key or a different reservation key.
3537          */
3538         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3539                                         iport_ptr);
3540         if (!dest_pr_reg) {
3541                 if (core_scsi3_alloc_registration(cmd->se_dev,
3542                                 dest_node_acl, dest_se_deve, iport_ptr,
3543                                 sa_res_key, 0, aptpl, 2, 1)) {
3544                         spin_unlock(&dev->dev_reservation_lock);
3545                         ret = TCM_INVALID_PARAMETER_LIST;
3546                         goto out;
3547                 }
3548                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3549                                                 iport_ptr);
3550                 new_reg = 1;
3551         }
3552         /*
3553          * f) Release the persistent reservation for the persistent reservation
3554          *    holder (i.e., the I_T nexus on which the
3555          */
3556         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3557                         dev->dev_pr_res_holder, 0);
3558         /*
3559          * g) Move the persistent reservation to the specified I_T nexus using
3560          *    the same scope and type as the persistent reservation released in
3561          *    item f); and
3562          */
3563         dev->dev_pr_res_holder = dest_pr_reg;
3564         dest_pr_reg->pr_res_holder = 1;
3565         dest_pr_reg->pr_res_type = type;
3566         pr_reg->pr_res_scope = scope;
3567         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3568                                 PR_REG_ISID_ID_LEN);
3569         /*
3570          * Increment PRGeneration for existing registrations..
3571          */
3572         if (!new_reg)
3573                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3574         spin_unlock(&dev->dev_reservation_lock);
3575
3576         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3577                 " created new reservation holder TYPE: %s on object RTPI:"
3578                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3579                 core_scsi3_pr_dump_type(type), rtpi,
3580                 dest_pr_reg->pr_res_generation);
3581         pr_debug("SPC-3 PR Successfully moved reservation from"
3582                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3583                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3584                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3585                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3586                 iport_ptr : "");
3587         /*
3588          * It is now safe to release configfs group dependencies for destination
3589          * of Transport ID Initiator Device/Port Identifier
3590          */
3591         core_scsi3_lunacl_undepend_item(dest_se_deve);
3592         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3593         core_scsi3_tpg_undepend_item(dest_se_tpg);
3594         /*
3595          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3596          * nexus on which PERSISTENT RESERVE OUT command was received.
3597          */
3598         if (unreg) {
3599                 spin_lock(&pr_tmpl->registration_lock);
3600                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3601                 spin_unlock(&pr_tmpl->registration_lock);
3602         } else
3603                 core_scsi3_put_pr_reg(pr_reg);
3604
3605         /*
3606          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3607          * write out the updated metadata to struct file for this SCSI device.
3608          */
3609         if (!aptpl) {
3610                 pr_tmpl->pr_aptpl_active = 0;
3611                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3612                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3613                                 " REGISTER_AND_MOVE\n");
3614         } else {
3615                 pr_tmpl->pr_aptpl_active = 1;
3616                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3617                                 &dest_pr_reg->pr_aptpl_buf[0],
3618                                 pr_tmpl->pr_aptpl_buf_len)) {
3619                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3620                                         " REGISTER_AND_MOVE\n");
3621                 }
3622         }
3623
3624         transport_kunmap_data_sg(cmd);
3625
3626         core_scsi3_put_pr_reg(dest_pr_reg);
3627         return 0;
3628 out:
3629         if (buf)
3630                 transport_kunmap_data_sg(cmd);
3631         if (dest_se_deve)
3632                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3633         if (dest_node_acl)
3634                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3635         core_scsi3_tpg_undepend_item(dest_se_tpg);
3636
3637 out_put_pr_reg:
3638         core_scsi3_put_pr_reg(pr_reg);
3639         return ret;
3640 }
3641
3642 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3643 {
3644         unsigned int __v1, __v2;
3645
3646         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3647         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3648
3649         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3650 }
3651
3652 /*
3653  * See spc4r17 section 6.14 Table 170
3654  */
3655 sense_reason_t
3656 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3657 {
3658         unsigned char *cdb = &cmd->t_task_cdb[0];
3659         unsigned char *buf;
3660         u64 res_key, sa_res_key;
3661         int sa, scope, type, aptpl;
3662         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3663         sense_reason_t ret;
3664
3665         /*
3666          * Following spc2r20 5.5.1 Reservations overview:
3667          *
3668          * If a logical unit has been reserved by any RESERVE command and is
3669          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3670          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3671          * initiator or service action and shall terminate with a RESERVATION
3672          * CONFLICT status.
3673          */
3674         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3675                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3676                         " SPC-2 reservation is held, returning"
3677                         " RESERVATION_CONFLICT\n");
3678                 return TCM_RESERVATION_CONFLICT;
3679         }
3680
3681         /*
3682          * FIXME: A NULL struct se_session pointer means an this is not coming from
3683          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3684          */
3685         if (!cmd->se_sess)
3686                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3687
3688         if (cmd->data_length < 24) {
3689                 pr_warn("SPC-PR: Received PR OUT parameter list"
3690                         " length too small: %u\n", cmd->data_length);
3691                 return TCM_INVALID_PARAMETER_LIST;
3692         }
3693
3694         /*
3695          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3696          */
3697         sa = (cdb[1] & 0x1f);
3698         scope = (cdb[2] & 0xf0);
3699         type = (cdb[2] & 0x0f);
3700
3701         buf = transport_kmap_data_sg(cmd);
3702         if (!buf)
3703                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3704
3705         /*
3706          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3707          */
3708         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3709         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3710         /*
3711          * REGISTER_AND_MOVE uses a different SA parameter list containing
3712          * SCSI TransportIDs.
3713          */
3714         if (sa != PRO_REGISTER_AND_MOVE) {
3715                 spec_i_pt = (buf[20] & 0x08);
3716                 all_tg_pt = (buf[20] & 0x04);
3717                 aptpl = (buf[20] & 0x01);
3718         } else {
3719                 aptpl = (buf[17] & 0x01);
3720                 unreg = (buf[17] & 0x02);
3721         }
3722         transport_kunmap_data_sg(cmd);
3723         buf = NULL;
3724
3725         /*
3726          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3727          */
3728         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3729                 return TCM_INVALID_PARAMETER_LIST;
3730
3731         /*
3732          * From spc4r17 section 6.14:
3733          *
3734          * If the SPEC_I_PT bit is set to zero, the service action is not
3735          * REGISTER AND MOVE, and the parameter list length is not 24, then
3736          * the command shall be terminated with CHECK CONDITION status, with
3737          * the sense key set to ILLEGAL REQUEST, and the additional sense
3738          * code set to PARAMETER LIST LENGTH ERROR.
3739          */
3740         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3741             (cmd->data_length != 24)) {
3742                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3743                         " list length: %u\n", cmd->data_length);
3744                 return TCM_INVALID_PARAMETER_LIST;
3745         }
3746
3747         /*
3748          * (core_scsi3_emulate_pro_* function parameters
3749          * are defined by spc4r17 Table 174:
3750          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3751          */
3752         switch (sa) {
3753         case PRO_REGISTER:
3754                 ret = core_scsi3_emulate_pro_register(cmd,
3755                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3756                 break;
3757         case PRO_RESERVE:
3758                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3759                 break;
3760         case PRO_RELEASE:
3761                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3762                 break;
3763         case PRO_CLEAR:
3764                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3765                 break;
3766         case PRO_PREEMPT:
3767                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3768                                         res_key, sa_res_key, 0);
3769                 break;
3770         case PRO_PREEMPT_AND_ABORT:
3771                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3772                                         res_key, sa_res_key, 1);
3773                 break;
3774         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3775                 ret = core_scsi3_emulate_pro_register(cmd,
3776                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3777                 break;
3778         case PRO_REGISTER_AND_MOVE:
3779                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3780                                 sa_res_key, aptpl, unreg);
3781                 break;
3782         default:
3783                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3784                         " action: 0x%02x\n", cdb[1] & 0x1f);
3785                 return TCM_INVALID_CDB_FIELD;
3786         }
3787
3788         if (!ret)
3789                 target_complete_cmd(cmd, GOOD);
3790         return ret;
3791 }
3792
3793 /*
3794  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3795  *
3796  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3797  */
3798 static sense_reason_t
3799 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3800 {
3801         struct se_device *dev = cmd->se_dev;
3802         struct t10_pr_registration *pr_reg;
3803         unsigned char *buf;
3804         u32 add_len = 0, off = 8;
3805
3806         if (cmd->data_length < 8) {
3807                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3808                         " too small\n", cmd->data_length);
3809                 return TCM_INVALID_CDB_FIELD;
3810         }
3811
3812         buf = transport_kmap_data_sg(cmd);
3813         if (!buf)
3814                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3815
3816         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3817         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3818         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3819         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3820
3821         spin_lock(&dev->t10_pr.registration_lock);
3822         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3823                         pr_reg_list) {
3824                 /*
3825                  * Check for overflow of 8byte PRI READ_KEYS payload and
3826                  * next reservation key list descriptor.
3827                  */
3828                 if ((add_len + 8) > (cmd->data_length - 8))
3829                         break;
3830
3831                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3832                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3833                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3834                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3835                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3836                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3837                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3838                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3839
3840                 add_len += 8;
3841         }
3842         spin_unlock(&dev->t10_pr.registration_lock);
3843
3844         buf[4] = ((add_len >> 24) & 0xff);
3845         buf[5] = ((add_len >> 16) & 0xff);
3846         buf[6] = ((add_len >> 8) & 0xff);
3847         buf[7] = (add_len & 0xff);
3848
3849         transport_kunmap_data_sg(cmd);
3850
3851         return 0;
3852 }
3853
3854 /*
3855  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3856  *
3857  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3858  */
3859 static sense_reason_t
3860 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3861 {
3862         struct se_device *dev = cmd->se_dev;
3863         struct t10_pr_registration *pr_reg;
3864         unsigned char *buf;
3865         u64 pr_res_key;
3866         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3867
3868         if (cmd->data_length < 8) {
3869                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3870                         " too small\n", cmd->data_length);
3871                 return TCM_INVALID_CDB_FIELD;
3872         }
3873
3874         buf = transport_kmap_data_sg(cmd);
3875         if (!buf)
3876                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3877
3878         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3879         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3880         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3881         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3882
3883         spin_lock(&dev->dev_reservation_lock);
3884         pr_reg = dev->dev_pr_res_holder;
3885         if (pr_reg) {
3886                 /*
3887                  * Set the hardcoded Additional Length
3888                  */
3889                 buf[4] = ((add_len >> 24) & 0xff);
3890                 buf[5] = ((add_len >> 16) & 0xff);
3891                 buf[6] = ((add_len >> 8) & 0xff);
3892                 buf[7] = (add_len & 0xff);
3893
3894                 if (cmd->data_length < 22)
3895                         goto err;
3896
3897                 /*
3898                  * Set the Reservation key.
3899                  *
3900                  * From spc4r17, section 5.7.10:
3901                  * A persistent reservation holder has its reservation key
3902                  * returned in the parameter data from a PERSISTENT
3903                  * RESERVE IN command with READ RESERVATION service action as
3904                  * follows:
3905                  * a) For a persistent reservation of the type Write Exclusive
3906                  *    - All Registrants or Exclusive Access  All Regitrants,
3907                  *      the reservation key shall be set to zero; or
3908                  * b) For all other persistent reservation types, the
3909                  *    reservation key shall be set to the registered
3910                  *    reservation key for the I_T nexus that holds the
3911                  *    persistent reservation.
3912                  */
3913                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3914                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3915                         pr_res_key = 0;
3916                 else
3917                         pr_res_key = pr_reg->pr_res_key;
3918
3919                 buf[8] = ((pr_res_key >> 56) & 0xff);
3920                 buf[9] = ((pr_res_key >> 48) & 0xff);
3921                 buf[10] = ((pr_res_key >> 40) & 0xff);
3922                 buf[11] = ((pr_res_key >> 32) & 0xff);
3923                 buf[12] = ((pr_res_key >> 24) & 0xff);
3924                 buf[13] = ((pr_res_key >> 16) & 0xff);
3925                 buf[14] = ((pr_res_key >> 8) & 0xff);
3926                 buf[15] = (pr_res_key & 0xff);
3927                 /*
3928                  * Set the SCOPE and TYPE
3929                  */
3930                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3931                           (pr_reg->pr_res_type & 0x0f);
3932         }
3933
3934 err:
3935         spin_unlock(&dev->dev_reservation_lock);
3936         transport_kunmap_data_sg(cmd);
3937
3938         return 0;
3939 }
3940
3941 /*
3942  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3943  *
3944  * See spc4r17 section 6.13.4 Table 165
3945  */
3946 static sense_reason_t
3947 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3948 {
3949         struct se_device *dev = cmd->se_dev;
3950         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3951         unsigned char *buf;
3952         u16 add_len = 8; /* Hardcoded to 8. */
3953
3954         if (cmd->data_length < 6) {
3955                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3956                         " %u too small\n", cmd->data_length);
3957                 return TCM_INVALID_CDB_FIELD;
3958         }
3959
3960         buf = transport_kmap_data_sg(cmd);
3961         if (!buf)
3962                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3963
3964         buf[0] = ((add_len << 8) & 0xff);
3965         buf[1] = (add_len & 0xff);
3966         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3967         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3968         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3969         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3970         /*
3971          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3972          * set the TMV: Task Mask Valid bit.
3973          */
3974         buf[3] |= 0x80;
3975         /*
3976          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3977          */
3978         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3979         /*
3980          * PTPL_A: Persistence across Target Power Loss Active bit
3981          */
3982         if (pr_tmpl->pr_aptpl_active)
3983                 buf[3] |= 0x01;
3984         /*
3985          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3986          */
3987         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3988         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3989         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3990         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3991         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3992         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3993
3994         transport_kunmap_data_sg(cmd);
3995
3996         return 0;
3997 }
3998
3999 /*
4000  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4001  *
4002  * See spc4r17 section 6.13.5 Table 168 and 169
4003  */
4004 static sense_reason_t
4005 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4006 {
4007         struct se_device *dev = cmd->se_dev;
4008         struct se_node_acl *se_nacl;
4009         struct se_portal_group *se_tpg;
4010         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4011         struct t10_reservation *pr_tmpl = &dev->t10_pr;
4012         unsigned char *buf;
4013         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4014         u32 off = 8; /* off into first Full Status descriptor */
4015         int format_code = 0;
4016
4017         if (cmd->data_length < 8) {
4018                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4019                         " too small\n", cmd->data_length);
4020                 return TCM_INVALID_CDB_FIELD;
4021         }
4022
4023         buf = transport_kmap_data_sg(cmd);
4024         if (!buf)
4025                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4026
4027         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
4028         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
4029         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
4030         buf[3] = (dev->t10_pr.pr_generation & 0xff);
4031
4032         spin_lock(&pr_tmpl->registration_lock);
4033         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4034                         &pr_tmpl->registration_list, pr_reg_list) {
4035
4036                 se_nacl = pr_reg->pr_reg_nacl;
4037                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4038                 add_desc_len = 0;
4039
4040                 atomic_inc(&pr_reg->pr_res_holders);
4041                 smp_mb__after_atomic_inc();
4042                 spin_unlock(&pr_tmpl->registration_lock);
4043                 /*
4044                  * Determine expected length of $FABRIC_MOD specific
4045                  * TransportID full status descriptor..
4046                  */
4047                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4048                                 se_tpg, se_nacl, pr_reg, &format_code);
4049
4050                 if ((exp_desc_len + add_len) > cmd->data_length) {
4051                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4052                                 " out of buffer: %d\n", cmd->data_length);
4053                         spin_lock(&pr_tmpl->registration_lock);
4054                         atomic_dec(&pr_reg->pr_res_holders);
4055                         smp_mb__after_atomic_dec();
4056                         break;
4057                 }
4058                 /*
4059                  * Set RESERVATION KEY
4060                  */
4061                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4062                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4063                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4064                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4065                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4066                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4067                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4068                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4069                 off += 4; /* Skip Over Reserved area */
4070
4071                 /*
4072                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4073                  */
4074                 if (pr_reg->pr_reg_all_tg_pt)
4075                         buf[off] = 0x02;
4076                 /*
4077                  * The struct se_lun pointer will be present for the
4078                  * reservation holder for PR_HOLDER bit.
4079                  *
4080                  * Also, if this registration is the reservation
4081                  * holder, fill in SCOPE and TYPE in the next byte.
4082                  */
4083                 if (pr_reg->pr_res_holder) {
4084                         buf[off++] |= 0x01;
4085                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4086                                      (pr_reg->pr_res_type & 0x0f);
4087                 } else
4088                         off += 2;
4089
4090                 off += 4; /* Skip over reserved area */
4091                 /*
4092                  * From spc4r17 6.3.15:
4093                  *
4094                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4095                  * IDENTIFIER field contains the relative port identifier (see
4096                  * 3.1.120) of the target port that is part of the I_T nexus
4097                  * described by this full status descriptor. If the ALL_TG_PT
4098                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4099                  * IDENTIFIER field are not defined by this standard.
4100                  */
4101                 if (!pr_reg->pr_reg_all_tg_pt) {
4102                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4103
4104                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4105                         buf[off++] = (port->sep_rtpi & 0xff);
4106                 } else
4107                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4108
4109                 /*
4110                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4111                  */
4112                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4113                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4114
4115                 spin_lock(&pr_tmpl->registration_lock);
4116                 atomic_dec(&pr_reg->pr_res_holders);
4117                 smp_mb__after_atomic_dec();
4118                 /*
4119                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4120                  */
4121                 buf[off++] = ((desc_len >> 24) & 0xff);
4122                 buf[off++] = ((desc_len >> 16) & 0xff);
4123                 buf[off++] = ((desc_len >> 8) & 0xff);
4124                 buf[off++] = (desc_len & 0xff);
4125                 /*
4126                  * Size of full desctipor header minus TransportID
4127                  * containing $FABRIC_MOD specific) initiator device/port
4128                  * WWN information.
4129                  *
4130                  *  See spc4r17 Section 6.13.5 Table 169
4131                  */
4132                 add_desc_len = (24 + desc_len);
4133
4134                 off += desc_len;
4135                 add_len += add_desc_len;
4136         }
4137         spin_unlock(&pr_tmpl->registration_lock);
4138         /*
4139          * Set ADDITIONAL_LENGTH
4140          */
4141         buf[4] = ((add_len >> 24) & 0xff);
4142         buf[5] = ((add_len >> 16) & 0xff);
4143         buf[6] = ((add_len >> 8) & 0xff);
4144         buf[7] = (add_len & 0xff);
4145
4146         transport_kunmap_data_sg(cmd);
4147
4148         return 0;
4149 }
4150
4151 sense_reason_t
4152 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4153 {
4154         sense_reason_t ret;
4155
4156         /*
4157          * Following spc2r20 5.5.1 Reservations overview:
4158          *
4159          * If a logical unit has been reserved by any RESERVE command and is
4160          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4161          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4162          * initiator or service action and shall terminate with a RESERVATION
4163          * CONFLICT status.
4164          */
4165         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4166                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4167                         " SPC-2 reservation is held, returning"
4168                         " RESERVATION_CONFLICT\n");
4169                 return TCM_RESERVATION_CONFLICT;
4170         }
4171
4172         switch (cmd->t_task_cdb[1] & 0x1f) {
4173         case PRI_READ_KEYS:
4174                 ret = core_scsi3_pri_read_keys(cmd);
4175                 break;
4176         case PRI_READ_RESERVATION:
4177                 ret = core_scsi3_pri_read_reservation(cmd);
4178                 break;
4179         case PRI_REPORT_CAPABILITIES:
4180                 ret = core_scsi3_pri_report_capabilities(cmd);
4181                 break;
4182         case PRI_READ_FULL_STATUS:
4183                 ret = core_scsi3_pri_read_full_status(cmd);
4184                 break;
4185         default:
4186                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4187                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4188                 return TCM_INVALID_CDB_FIELD;
4189         }
4190
4191         if (!ret)
4192                 target_complete_cmd(cmd, GOOD);
4193         return ret;
4194 }
4195
4196 sense_reason_t
4197 target_check_reservation(struct se_cmd *cmd)
4198 {
4199         struct se_device *dev = cmd->se_dev;
4200         sense_reason_t ret;
4201
4202         if (!cmd->se_sess)
4203                 return 0;
4204         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4205                 return 0;
4206         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4207                 return 0;
4208
4209         spin_lock(&dev->dev_reservation_lock);
4210         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4211                 ret = target_scsi2_reservation_check(cmd);
4212         else
4213                 ret = target_scsi3_pr_reservation_check(cmd);
4214         spin_unlock(&dev->dev_reservation_lock);
4215
4216         return ret;
4217 }