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 2009-2013 Datera, Inc.
   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 void 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                 buf[0] = '\0';
  63
  64         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  65 }
  66
  67 enum register_type {
  68         REGISTER,
  69         REGISTER_AND_IGNORE_EXISTING_KEY,
  70         REGISTER_AND_MOVE,
  71 };
  72
  73 enum preempt_type {
  74         PREEMPT,
  75         PREEMPT_AND_ABORT,
  76 };
  77
  78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  79                         struct t10_pr_registration *, int);
  80
  81 static sense_reason_t
  82 target_scsi2_reservation_check(struct se_cmd *cmd)
  83 {
  84         struct se_device *dev = cmd->se_dev;
  85         struct se_session *sess = cmd->se_sess;
  86
  87         switch (cmd->t_task_cdb[0]) {
  88         case INQUIRY:
  89         case RELEASE:
  90         case RELEASE_10:
  91                 return 0;
  92         default:
  93                 break;
  94         }
  95
  96         if (!dev->dev_reserved_node_acl || !sess)
  97                 return 0;
  98
  99         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 100                 return TCM_RESERVATION_CONFLICT;
 101
 102         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 103                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 104                         return TCM_RESERVATION_CONFLICT;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 111                                         struct se_node_acl *, struct se_session *);
 112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 113
 114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 115 {
 116         struct se_session *se_sess = cmd->se_sess;
 117         struct se_device *dev = cmd->se_dev;
 118         struct t10_pr_registration *pr_reg;
 119         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 120         int conflict = 0;
 121
 122         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 123                         se_sess);
 124         if (pr_reg) {
 125                 /*
 126                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 127                  * behavior
 128                  *
 129                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 130                  * status, but no reservation shall be established and the
 131                  * persistent reservation shall not be changed, if the command
 132                  * is received from a) and b) below.
 133                  *
 134                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 135                  * status, but the persistent reservation shall not be released,
 136                  * if the command is received from a) and b)
 137                  *
 138                  * a) An I_T nexus that is a persistent reservation holder; or
 139                  * b) An I_T nexus that is registered if a registrants only or
 140                  *    all registrants type persistent reservation is present.
 141                  *
 142                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 143                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 144                  * as defined in SPC-2.
 145                  */
 146                 if (pr_reg->pr_res_holder) {
 147                         core_scsi3_put_pr_reg(pr_reg);
 148                         return 1;
 149                 }
 150                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 151                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 152                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 153                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 154                         core_scsi3_put_pr_reg(pr_reg);
 155                         return 1;
 156                 }
 157                 core_scsi3_put_pr_reg(pr_reg);
 158                 conflict = 1;
 159         } else {
 160                 /*
 161                  * Following spc2r20 5.5.1 Reservations overview:
 162                  *
 163                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 164                  * command with the REGISTER or the REGISTER AND IGNORE
 165                  * EXISTING KEY service action and is still registered by any
 166                  * initiator, all RESERVE commands and all RELEASE commands
 167                  * regardless of initiator shall conflict and shall terminate
 168                  * with a RESERVATION CONFLICT status.
 169                  */
 170                 spin_lock(&pr_tmpl->registration_lock);
 171                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 172                 spin_unlock(&pr_tmpl->registration_lock);
 173         }
 174
 175         if (conflict) {
 176                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 177                         " while active SPC-3 registrations exist,"
 178                         " returning RESERVATION_CONFLICT\n");
 179                 return -EBUSY;
 180         }
 181
 182         return 0;
 183 }
 184
 185 sense_reason_t
 186 target_scsi2_reservation_release(struct se_cmd *cmd)
 187 {
 188         struct se_device *dev = cmd->se_dev;
 189         struct se_session *sess = cmd->se_sess;
 190         struct se_portal_group *tpg;
 191         int rc;
 192
 193         if (!sess || !sess->se_tpg)
 194                 goto out;
 195         rc = target_check_scsi2_reservation_conflict(cmd);
 196         if (rc == 1)
 197                 goto out;
 198         if (rc < 0)
 199                 return TCM_RESERVATION_CONFLICT;
 200
 201         spin_lock(&dev->dev_reservation_lock);
 202         if (!dev->dev_reserved_node_acl || !sess)
 203                 goto out_unlock;
 204
 205         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 206                 goto out_unlock;
 207
 208         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 209                 goto out_unlock;
 210
 211         dev->dev_reserved_node_acl = NULL;
 212         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 213         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 214                 dev->dev_res_bin_isid = 0;
 215                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 216         }
 217         tpg = sess->se_tpg;
 218         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 219                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 220                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 221                 sess->se_node_acl->initiatorname);
 222
 223 out_unlock:
 224         spin_unlock(&dev->dev_reservation_lock);
 225 out:
 226         target_complete_cmd(cmd, GOOD);
 227         return 0;
 228 }
 229
 230 sense_reason_t
 231 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 232 {
 233         struct se_device *dev = cmd->se_dev;
 234         struct se_session *sess = cmd->se_sess;
 235         struct se_portal_group *tpg;
 236         sense_reason_t ret = 0;
 237         int rc;
 238
 239         if ((cmd->t_task_cdb[1] & 0x01) &&
 240             (cmd->t_task_cdb[1] & 0x02)) {
 241                 pr_err("LongIO and Obselete Bits set, returning"
 242                                 " ILLEGAL_REQUEST\n");
 243                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 244         }
 245         /*
 246          * This is currently the case for target_core_mod passthrough struct se_cmd
 247          * ops
 248          */
 249         if (!sess || !sess->se_tpg)
 250                 goto out;
 251         rc = target_check_scsi2_reservation_conflict(cmd);
 252         if (rc == 1)
 253                 goto out;
 254
 255         if (rc < 0)
 256                 return TCM_RESERVATION_CONFLICT;
 257
 258         tpg = sess->se_tpg;
 259         spin_lock(&dev->dev_reservation_lock);
 260         if (dev->dev_reserved_node_acl &&
 261            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 262                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 263                         tpg->se_tpg_tfo->get_fabric_name());
 264                 pr_err("Original reserver LUN: %u %s\n",
 265                         cmd->se_lun->unpacked_lun,
 266                         dev->dev_reserved_node_acl->initiatorname);
 267                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 268                         " from %s \n", cmd->se_lun->unpacked_lun,
 269                         cmd->se_deve->mapped_lun,
 270                         sess->se_node_acl->initiatorname);
 271                 ret = TCM_RESERVATION_CONFLICT;
 272                 goto out_unlock;
 273         }
 274
 275         dev->dev_reserved_node_acl = sess->se_node_acl;
 276         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 277         if (sess->sess_bin_isid != 0) {
 278                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 279                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 280         }
 281         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 282                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 283                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 284                 sess->se_node_acl->initiatorname);
 285
 286 out_unlock:
 287         spin_unlock(&dev->dev_reservation_lock);
 288 out:
 289         if (!ret)
 290                 target_complete_cmd(cmd, GOOD);
 291         return ret;
 292 }
 293
 294
 295 /*
 296  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 297  *
 298  * This function is called by those initiator ports who are *NOT*
 299  * the active PR reservation holder when a reservation is present.
 300  */
 301 static int core_scsi3_pr_seq_non_holder(
 302         struct se_cmd *cmd,
 303         u32 pr_reg_type)
 304 {
 305         unsigned char *cdb = cmd->t_task_cdb;
 306         struct se_dev_entry *se_deve;
 307         struct se_session *se_sess = cmd->se_sess;
 308         int other_cdb = 0, ignore_reg;
 309         int registered_nexus = 0, ret = 1; /* Conflict by default */
 310         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 311         int we = 0; /* Write Exclusive */
 312         int legacy = 0; /* Act like a legacy device and return
 313                          * RESERVATION CONFLICT on some CDBs */
 314
 315         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 316         /*
 317          * Determine if the registration should be ignored due to
 318          * non-matching ISIDs in target_scsi3_pr_reservation_check().
 319          */
 320         ignore_reg = (pr_reg_type & 0x80000000);
 321         if (ignore_reg)
 322                 pr_reg_type &= ~0x80000000;
 323
 324         switch (pr_reg_type) {
 325         case PR_TYPE_WRITE_EXCLUSIVE:
 326                 we = 1;
 327         case PR_TYPE_EXCLUSIVE_ACCESS:
 328                 /*
 329                  * Some commands are only allowed for the persistent reservation
 330                  * holder.
 331                  */
 332                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 333                         registered_nexus = 1;
 334                 break;
 335         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 336                 we = 1;
 337         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 338                 /*
 339                  * Some commands are only allowed for registered I_T Nexuses.
 340                  */
 341                 reg_only = 1;
 342                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 343                         registered_nexus = 1;
 344                 break;
 345         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 346                 we = 1;
 347         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 348                 /*
 349                  * Each registered I_T Nexus is a reservation holder.
 350                  */
 351                 all_reg = 1;
 352                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 353                         registered_nexus = 1;
 354                 break;
 355         default:
 356                 return -EINVAL;
 357         }
 358         /*
 359          * Referenced from spc4r17 table 45 for *NON* PR holder access
 360          */
 361         switch (cdb[0]) {
 362         case SECURITY_PROTOCOL_IN:
 363                 if (registered_nexus)
 364                         return 0;
 365                 ret = (we) ? 0 : 1;
 366                 break;
 367         case MODE_SENSE:
 368         case MODE_SENSE_10:
 369         case READ_ATTRIBUTE:
 370         case READ_BUFFER:
 371         case RECEIVE_DIAGNOSTIC:
 372                 if (legacy) {
 373                         ret = 1;
 374                         break;
 375                 }
 376                 if (registered_nexus) {
 377                         ret = 0;
 378                         break;
 379                 }
 380                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 381                 break;
 382         case PERSISTENT_RESERVE_OUT:
 383                 /*
 384                  * This follows PERSISTENT_RESERVE_OUT service actions that
 385                  * are allowed in the presence of various reservations.
 386                  * See spc4r17, table 46
 387                  */
 388                 switch (cdb[1] & 0x1f) {
 389                 case PRO_CLEAR:
 390                 case PRO_PREEMPT:
 391                 case PRO_PREEMPT_AND_ABORT:
 392                         ret = (registered_nexus) ? 0 : 1;
 393                         break;
 394                 case PRO_REGISTER:
 395                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 396                         ret = 0;
 397                         break;
 398                 case PRO_REGISTER_AND_MOVE:
 399                 case PRO_RESERVE:
 400                         ret = 1;
 401                         break;
 402                 case PRO_RELEASE:
 403                         ret = (registered_nexus) ? 0 : 1;
 404                         break;
 405                 default:
 406                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 407                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 408                         return -EINVAL;
 409                 }
 410                 break;
 411         case RELEASE:
 412         case RELEASE_10:
 413                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 414                 ret = 0;
 415                 break;
 416         case RESERVE:
 417         case RESERVE_10:
 418                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 419                 ret = 0;
 420                 break;
 421         case TEST_UNIT_READY:
 422                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 423                 break;
 424         case MAINTENANCE_IN:
 425                 switch (cdb[1] & 0x1f) {
 426                 case MI_MANAGEMENT_PROTOCOL_IN:
 427                         if (registered_nexus) {
 428                                 ret = 0;
 429                                 break;
 430                         }
 431                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 432                         break;
 433                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 434                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 435                         if (legacy) {
 436                                 ret = 1;
 437                                 break;
 438                         }
 439                         if (registered_nexus) {
 440                                 ret = 0;
 441                                 break;
 442                         }
 443                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 444                         break;
 445                 case MI_REPORT_ALIASES:
 446                 case MI_REPORT_IDENTIFYING_INFORMATION:
 447                 case MI_REPORT_PRIORITY:
 448                 case MI_REPORT_TARGET_PGS:
 449                 case MI_REPORT_TIMESTAMP:
 450                         ret = 0; /* Allowed */
 451                         break;
 452                 default:
 453                         pr_err("Unknown MI Service Action: 0x%02x\n",
 454                                 (cdb[1] & 0x1f));
 455                         return -EINVAL;
 456                 }
 457                 break;
 458         case ACCESS_CONTROL_IN:
 459         case ACCESS_CONTROL_OUT:
 460         case INQUIRY:
 461         case LOG_SENSE:
 462         case READ_MEDIA_SERIAL_NUMBER:
 463         case REPORT_LUNS:
 464         case REQUEST_SENSE:
 465         case PERSISTENT_RESERVE_IN:
 466                 ret = 0; /*/ Allowed CDBs */
 467                 break;
 468         default:
 469                 other_cdb = 1;
 470                 break;
 471         }
 472         /*
 473          * Case where the CDB is explicitly allowed in the above switch
 474          * statement.
 475          */
 476         if (!ret && !other_cdb) {
 477                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 478                         " reservation holder\n", cdb[0],
 479                         core_scsi3_pr_dump_type(pr_reg_type));
 480
 481                 return ret;
 482         }
 483         /*
 484          * Check if write exclusive initiator ports *NOT* holding the
 485          * WRITE_EXCLUSIVE_* reservation.
 486          */
 487         if (we && !registered_nexus) {
 488                 if (cmd->data_direction == DMA_TO_DEVICE) {
 489                         /*
 490                          * Conflict for write exclusive
 491                          */
 492                         pr_debug("%s Conflict for unregistered nexus"
 493                                 " %s CDB: 0x%02x to %s reservation\n",
 494                                 transport_dump_cmd_direction(cmd),
 495                                 se_sess->se_node_acl->initiatorname, cdb[0],
 496                                 core_scsi3_pr_dump_type(pr_reg_type));
 497                         return 1;
 498                 } else {
 499                         /*
 500                          * Allow non WRITE CDBs for all Write Exclusive
 501                          * PR TYPEs to pass for registered and
 502                          * non-registered_nexuxes NOT holding the reservation.
 503                          *
 504                          * We only make noise for the unregisterd nexuses,
 505                          * as we expect registered non-reservation holding
 506                          * nexuses to issue CDBs.
 507                          */
 508
 509                         if (!registered_nexus) {
 510                                 pr_debug("Allowing implicit CDB: 0x%02x"
 511                                         " for %s reservation on unregistered"
 512                                         " nexus\n", cdb[0],
 513                                         core_scsi3_pr_dump_type(pr_reg_type));
 514                         }
 515
 516                         return 0;
 517                 }
 518         } else if ((reg_only) || (all_reg)) {
 519                 if (registered_nexus) {
 520                         /*
 521                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 522                          * allow commands from registered nexuses.
 523                          */
 524
 525                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 526                                 " reservation\n", cdb[0],
 527                                 core_scsi3_pr_dump_type(pr_reg_type));
 528
 529                         return 0;
 530                 }
 531         }
 532         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 533                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 534                 (registered_nexus) ? "" : "un",
 535                 se_sess->se_node_acl->initiatorname, cdb[0],
 536                 core_scsi3_pr_dump_type(pr_reg_type));
 537
 538         return 1; /* Conflict by default */
 539 }
 540
 541 static sense_reason_t
 542 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 543 {
 544         struct se_device *dev = cmd->se_dev;
 545         struct se_session *sess = cmd->se_sess;
 546         u32 pr_reg_type;
 547
 548         if (!dev->dev_pr_res_holder)
 549                 return 0;
 550
 551         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 552         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 553         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 554                 goto check_nonholder;
 555
 556         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 557                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 558                     sess->sess_bin_isid) {
 559                         pr_reg_type |= 0x80000000;
 560                         goto check_nonholder;
 561                 }
 562         }
 563
 564         return 0;
 565
 566 check_nonholder:
 567         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
 568                 return TCM_RESERVATION_CONFLICT;
 569         return 0;
 570 }
 571
 572 static u32 core_scsi3_pr_generation(struct se_device *dev)
 573 {
 574         u32 prg;
 575
 576         /*
 577          * PRGeneration field shall contain the value of a 32-bit wrapping
 578          * counter mainted by the device server.
 579          *
 580          * Note that this is done regardless of Active Persist across
 581          * Target PowerLoss (APTPL)
 582          *
 583          * See spc4r17 section 6.3.12 READ_KEYS service action
 584          */
 585         spin_lock(&dev->dev_reservation_lock);
 586         prg = dev->t10_pr.pr_generation++;
 587         spin_unlock(&dev->dev_reservation_lock);
 588
 589         return prg;
 590 }
 591
 592 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 593         struct se_device *dev,
 594         struct se_node_acl *nacl,
 595         struct se_dev_entry *deve,
 596         unsigned char *isid,
 597         u64 sa_res_key,
 598         int all_tg_pt,
 599         int aptpl)
 600 {
 601         struct t10_pr_registration *pr_reg;
 602
 603         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 604         if (!pr_reg) {
 605                 pr_err("Unable to allocate struct t10_pr_registration\n");
 606                 return NULL;
 607         }
 608
 609         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 610         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 611         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 612         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 613         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 614         atomic_set(&pr_reg->pr_res_holders, 0);
 615         pr_reg->pr_reg_nacl = nacl;
 616         pr_reg->pr_reg_deve = deve;
 617         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 618         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 619         pr_reg->pr_res_key = sa_res_key;
 620         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 621         pr_reg->pr_reg_aptpl = aptpl;
 622         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 623         /*
 624          * If an ISID value for this SCSI Initiator Port exists,
 625          * save it to the registration now.
 626          */
 627         if (isid != NULL) {
 628                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 629                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 630                 pr_reg->isid_present_at_reg = 1;
 631         }
 632
 633         return pr_reg;
 634 }
 635
 636 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 637 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 638
 639 /*
 640  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 641  * modes.
 642  */
 643 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 644         struct se_device *dev,
 645         struct se_node_acl *nacl,
 646         struct se_dev_entry *deve,
 647         unsigned char *isid,
 648         u64 sa_res_key,
 649         int all_tg_pt,
 650         int aptpl)
 651 {
 652         struct se_dev_entry *deve_tmp;
 653         struct se_node_acl *nacl_tmp;
 654         struct se_port *port, *port_tmp;
 655         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 656         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 657         int ret;
 658         /*
 659          * Create a registration for the I_T Nexus upon which the
 660          * PROUT REGISTER was received.
 661          */
 662         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 663                         sa_res_key, all_tg_pt, aptpl);
 664         if (!pr_reg)
 665                 return NULL;
 666         /*
 667          * Return pointer to pr_reg for ALL_TG_PT=0
 668          */
 669         if (!all_tg_pt)
 670                 return pr_reg;
 671         /*
 672          * Create list of matching SCSI Initiator Port registrations
 673          * for ALL_TG_PT=1
 674          */
 675         spin_lock(&dev->se_port_lock);
 676         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 677                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 678                 smp_mb__after_atomic_inc();
 679                 spin_unlock(&dev->se_port_lock);
 680
 681                 spin_lock_bh(&port->sep_alua_lock);
 682                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 683                                         alua_port_list) {
 684                         /*
 685                          * This pointer will be NULL for demo mode MappedLUNs
 686                          * that have not been make explicit via a ConfigFS
 687                          * MappedLUN group for the SCSI Initiator Node ACL.
 688                          */
 689                         if (!deve_tmp->se_lun_acl)
 690                                 continue;
 691
 692                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 693                         /*
 694                          * Skip the matching struct se_node_acl that is allocated
 695                          * above..
 696                          */
 697                         if (nacl == nacl_tmp)
 698                                 continue;
 699                         /*
 700                          * Only perform PR registrations for target ports on
 701                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 702                          * arrived.
 703                          */
 704                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 705                                 continue;
 706                         /*
 707                          * Look for a matching Initiator Node ACL in ASCII format
 708                          */
 709                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 710                                 continue;
 711
 712                         atomic_inc(&deve_tmp->pr_ref_count);
 713                         smp_mb__after_atomic_inc();
 714                         spin_unlock_bh(&port->sep_alua_lock);
 715                         /*
 716                          * Grab a configfs group dependency that is released
 717                          * for the exception path at label out: below, or upon
 718                          * completion of adding ALL_TG_PT=1 registrations in
 719                          * __core_scsi3_add_registration()
 720                          */
 721                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 722                         if (ret < 0) {
 723                                 pr_err("core_scsi3_lunacl_depend"
 724                                                 "_item() failed\n");
 725                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 726                                 smp_mb__after_atomic_dec();
 727                                 atomic_dec(&deve_tmp->pr_ref_count);
 728                                 smp_mb__after_atomic_dec();
 729                                 goto out;
 730                         }
 731                         /*
 732                          * Located a matching SCSI Initiator Port on a different
 733                          * port, allocate the pr_reg_atp and attach it to the
 734                          * pr_reg->pr_reg_atp_list that will be processed once
 735                          * the original *pr_reg is processed in
 736                          * __core_scsi3_add_registration()
 737                          */
 738                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 739                                                 nacl_tmp, deve_tmp, NULL,
 740                                                 sa_res_key, all_tg_pt, aptpl);
 741                         if (!pr_reg_atp) {
 742                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 743                                 smp_mb__after_atomic_dec();
 744                                 atomic_dec(&deve_tmp->pr_ref_count);
 745                                 smp_mb__after_atomic_dec();
 746                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 747                                 goto out;
 748                         }
 749
 750                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 751                                       &pr_reg->pr_reg_atp_list);
 752                         spin_lock_bh(&port->sep_alua_lock);
 753                 }
 754                 spin_unlock_bh(&port->sep_alua_lock);
 755
 756                 spin_lock(&dev->se_port_lock);
 757                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 758                 smp_mb__after_atomic_dec();
 759         }
 760         spin_unlock(&dev->se_port_lock);
 761
 762         return pr_reg;
 763 out:
 764         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 765                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 766                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 767                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 768                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 769         }
 770         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 771         return NULL;
 772 }
 773
 774 int core_scsi3_alloc_aptpl_registration(
 775         struct t10_reservation *pr_tmpl,
 776         u64 sa_res_key,
 777         unsigned char *i_port,
 778         unsigned char *isid,
 779         u32 mapped_lun,
 780         unsigned char *t_port,
 781         u16 tpgt,
 782         u32 target_lun,
 783         int res_holder,
 784         int all_tg_pt,
 785         u8 type)
 786 {
 787         struct t10_pr_registration *pr_reg;
 788
 789         if (!i_port || !t_port || !sa_res_key) {
 790                 pr_err("Illegal parameters for APTPL registration\n");
 791                 return -EINVAL;
 792         }
 793
 794         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 795         if (!pr_reg) {
 796                 pr_err("Unable to allocate struct t10_pr_registration\n");
 797                 return -ENOMEM;
 798         }
 799
 800         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 801         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 802         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 803         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 804         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 805         atomic_set(&pr_reg->pr_res_holders, 0);
 806         pr_reg->pr_reg_nacl = NULL;
 807         pr_reg->pr_reg_deve = NULL;
 808         pr_reg->pr_res_mapped_lun = mapped_lun;
 809         pr_reg->pr_aptpl_target_lun = target_lun;
 810         pr_reg->pr_res_key = sa_res_key;
 811         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 812         pr_reg->pr_reg_aptpl = 1;
 813         pr_reg->pr_reg_tg_pt_lun = NULL;
 814         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 815         pr_reg->pr_res_type = type;
 816         /*
 817          * If an ISID value had been saved in APTPL metadata for this
 818          * SCSI Initiator Port, restore it now.
 819          */
 820         if (isid != NULL) {
 821                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 822                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 823                 pr_reg->isid_present_at_reg = 1;
 824         }
 825         /*
 826          * Copy the i_port and t_port information from caller.
 827          */
 828         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 829         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 830         pr_reg->pr_reg_tpgt = tpgt;
 831         /*
 832          * Set pr_res_holder from caller, the pr_reg who is the reservation
 833          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 834          * the Initiator Node LUN ACL from the fabric module is created for
 835          * this registration.
 836          */
 837         pr_reg->pr_res_holder = res_holder;
 838
 839         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 840         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 841                         " metadata\n", (res_holder) ? "+reservation" : "");
 842         return 0;
 843 }
 844
 845 static void core_scsi3_aptpl_reserve(
 846         struct se_device *dev,
 847         struct se_portal_group *tpg,
 848         struct se_node_acl *node_acl,
 849         struct t10_pr_registration *pr_reg)
 850 {
 851         char i_buf[PR_REG_ISID_ID_LEN];
 852
 853         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 854         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 855
 856         spin_lock(&dev->dev_reservation_lock);
 857         dev->dev_pr_res_holder = pr_reg;
 858         spin_unlock(&dev->dev_reservation_lock);
 859
 860         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 861                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 862                 tpg->se_tpg_tfo->get_fabric_name(),
 863                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 864                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 865         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 866                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 867                 i_buf);
 868 }
 869
 870 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 871                                 struct t10_pr_registration *, enum register_type, int);
 872
 873 static int __core_scsi3_check_aptpl_registration(
 874         struct se_device *dev,
 875         struct se_portal_group *tpg,
 876         struct se_lun *lun,
 877         u32 target_lun,
 878         struct se_node_acl *nacl,
 879         struct se_dev_entry *deve)
 880 {
 881         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 882         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 883         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 884         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 885         u16 tpgt;
 886
 887         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 888         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 889         /*
 890          * Copy Initiator Port information from struct se_node_acl
 891          */
 892         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 893         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 894                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 895         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 896         /*
 897          * Look for the matching registrations+reservation from those
 898          * created from APTPL metadata.  Note that multiple registrations
 899          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 900          * TransportIDs.
 901          */
 902         spin_lock(&pr_tmpl->aptpl_reg_lock);
 903         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 904                                 pr_reg_aptpl_list) {
 905                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 906                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 907                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 908                      (pr_reg->pr_reg_tpgt == tpgt) &&
 909                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 910
 911                         pr_reg->pr_reg_nacl = nacl;
 912                         pr_reg->pr_reg_deve = deve;
 913                         pr_reg->pr_reg_tg_pt_lun = lun;
 914
 915                         list_del(&pr_reg->pr_reg_aptpl_list);
 916                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 917                         /*
 918                          * At this point all of the pointers in *pr_reg will
 919                          * be setup, so go ahead and add the registration.
 920                          */
 921
 922                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 923                         /*
 924                          * If this registration is the reservation holder,
 925                          * make that happen now..
 926                          */
 927                         if (pr_reg->pr_res_holder)
 928                                 core_scsi3_aptpl_reserve(dev, tpg,
 929                                                 nacl, pr_reg);
 930                         /*
 931                          * Reenable pr_aptpl_active to accept new metadata
 932                          * updates once the SCSI device is active again..
 933                          */
 934                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 935                         pr_tmpl->pr_aptpl_active = 1;
 936                 }
 937         }
 938         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 939
 940         return 0;
 941 }
 942
 943 int core_scsi3_check_aptpl_registration(
 944         struct se_device *dev,
 945         struct se_portal_group *tpg,
 946         struct se_lun *lun,
 947         struct se_lun_acl *lun_acl)
 948 {
 949         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 950         struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
 951
 952         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
 953                 return 0;
 954
 955         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 956                                 lun->unpacked_lun, nacl, deve);
 957 }
 958
 959 static void __core_scsi3_dump_registration(
 960         struct target_core_fabric_ops *tfo,
 961         struct se_device *dev,
 962         struct se_node_acl *nacl,
 963         struct t10_pr_registration *pr_reg,
 964         enum register_type register_type)
 965 {
 966         struct se_portal_group *se_tpg = nacl->se_tpg;
 967         char i_buf[PR_REG_ISID_ID_LEN];
 968
 969         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
 970         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 971
 972         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
 973                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
 974                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
 975                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
 976                 i_buf);
 977         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
 978                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
 979                 tfo->tpg_get_tag(se_tpg));
 980         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
 981                 " Port(s)\n",  tfo->get_fabric_name(),
 982                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
 983                 dev->transport->name);
 984         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
 985                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
 986                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
 987                 pr_reg->pr_reg_aptpl);
 988 }
 989
 990 /*
 991  * this function can be called with struct se_device->dev_reservation_lock
 992  * when register_move = 1
 993  */
 994 static void __core_scsi3_add_registration(
 995         struct se_device *dev,
 996         struct se_node_acl *nacl,
 997         struct t10_pr_registration *pr_reg,
 998         enum register_type register_type,
 999         int register_move)
1000 {
1001         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1002         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1003         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1004
1005         /*
1006          * Increment PRgeneration counter for struct se_device upon a successful
1007          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1008          *
1009          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1010          * action, the struct se_device->dev_reservation_lock will already be held,
1011          * so we do not call core_scsi3_pr_generation() which grabs the lock
1012          * for the REGISTER.
1013          */
1014         pr_reg->pr_res_generation = (register_move) ?
1015                         dev->t10_pr.pr_generation++ :
1016                         core_scsi3_pr_generation(dev);
1017
1018         spin_lock(&pr_tmpl->registration_lock);
1019         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1020         pr_reg->pr_reg_deve->def_pr_registered = 1;
1021
1022         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1023         spin_unlock(&pr_tmpl->registration_lock);
1024         /*
1025          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1026          */
1027         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1028                 return;
1029         /*
1030          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1031          * allocated in __core_scsi3_alloc_registration()
1032          */
1033         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1034                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1035                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1036
1037                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1038
1039                 spin_lock(&pr_tmpl->registration_lock);
1040                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1041                               &pr_tmpl->registration_list);
1042                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1043
1044                 __core_scsi3_dump_registration(tfo, dev,
1045                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1046                                 register_type);
1047                 spin_unlock(&pr_tmpl->registration_lock);
1048                 /*
1049                  * Drop configfs group dependency reference from
1050                  * __core_scsi3_alloc_registration()
1051                  */
1052                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1053         }
1054 }
1055
1056 static int core_scsi3_alloc_registration(
1057         struct se_device *dev,
1058         struct se_node_acl *nacl,
1059         struct se_dev_entry *deve,
1060         unsigned char *isid,
1061         u64 sa_res_key,
1062         int all_tg_pt,
1063         int aptpl,
1064         enum register_type register_type,
1065         int register_move)
1066 {
1067         struct t10_pr_registration *pr_reg;
1068
1069         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1070                         sa_res_key, all_tg_pt, aptpl);
1071         if (!pr_reg)
1072                 return -EPERM;
1073
1074         __core_scsi3_add_registration(dev, nacl, pr_reg,
1075                         register_type, register_move);
1076         return 0;
1077 }
1078
1079 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1080         struct se_device *dev,
1081         struct se_node_acl *nacl,
1082         unsigned char *isid)
1083 {
1084         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1085         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1086         struct se_portal_group *tpg;
1087
1088         spin_lock(&pr_tmpl->registration_lock);
1089         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1090                         &pr_tmpl->registration_list, pr_reg_list) {
1091                 /*
1092                  * First look for a matching struct se_node_acl
1093                  */
1094                 if (pr_reg->pr_reg_nacl != nacl)
1095                         continue;
1096
1097                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1098                 /*
1099                  * If this registration does NOT contain a fabric provided
1100                  * ISID, then we have found a match.
1101                  */
1102                 if (!pr_reg->isid_present_at_reg) {
1103                         /*
1104                          * Determine if this SCSI device server requires that
1105                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1106                          * for fabric modules (iSCSI) requiring them.
1107                          */
1108                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1109                                 if (dev->dev_attrib.enforce_pr_isids)
1110                                         continue;
1111                         }
1112                         atomic_inc(&pr_reg->pr_res_holders);
1113                         smp_mb__after_atomic_inc();
1114                         spin_unlock(&pr_tmpl->registration_lock);
1115                         return pr_reg;
1116                 }
1117                 /*
1118                  * If the *pr_reg contains a fabric defined ISID for multi-value
1119                  * SCSI Initiator Port TransportIDs, then we expect a valid
1120                  * matching ISID to be provided by the local SCSI Initiator Port.
1121                  */
1122                 if (!isid)
1123                         continue;
1124                 if (strcmp(isid, pr_reg->pr_reg_isid))
1125                         continue;
1126
1127                 atomic_inc(&pr_reg->pr_res_holders);
1128                 smp_mb__after_atomic_inc();
1129                 spin_unlock(&pr_tmpl->registration_lock);
1130                 return pr_reg;
1131         }
1132         spin_unlock(&pr_tmpl->registration_lock);
1133
1134         return NULL;
1135 }
1136
1137 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1138         struct se_device *dev,
1139         struct se_node_acl *nacl,
1140         struct se_session *sess)
1141 {
1142         struct se_portal_group *tpg = nacl->se_tpg;
1143         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1144
1145         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1146                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1147                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1148                                         PR_REG_ISID_LEN);
1149                 isid_ptr = &buf[0];
1150         }
1151
1152         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1153 }
1154
1155 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1156 {
1157         atomic_dec(&pr_reg->pr_res_holders);
1158         smp_mb__after_atomic_dec();
1159 }
1160
1161 static int core_scsi3_check_implicit_release(
1162         struct se_device *dev,
1163         struct t10_pr_registration *pr_reg)
1164 {
1165         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1166         struct t10_pr_registration *pr_res_holder;
1167         int ret = 0;
1168
1169         spin_lock(&dev->dev_reservation_lock);
1170         pr_res_holder = dev->dev_pr_res_holder;
1171         if (!pr_res_holder) {
1172                 spin_unlock(&dev->dev_reservation_lock);
1173                 return ret;
1174         }
1175         if (pr_res_holder == pr_reg) {
1176                 /*
1177                  * Perform an implicit RELEASE if the registration that
1178                  * is being released is holding the reservation.
1179                  *
1180                  * From spc4r17, section 5.7.11.1:
1181                  *
1182                  * e) If the I_T nexus is the persistent reservation holder
1183                  *    and the persistent reservation is not an all registrants
1184                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1185                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1186                  *    service action with the SERVICE ACTION RESERVATION KEY
1187                  *    field set to zero (see 5.7.11.3).
1188                  */
1189                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1190                 ret = 1;
1191                 /*
1192                  * For 'All Registrants' reservation types, all existing
1193                  * registrations are still processed as reservation holders
1194                  * in core_scsi3_pr_seq_non_holder() after the initial
1195                  * reservation holder is implicitly released here.
1196                  */
1197         } else if (pr_reg->pr_reg_all_tg_pt &&
1198                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1199                           pr_reg->pr_reg_nacl->initiatorname)) &&
1200                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1201                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1202                         " UNREGISTER while existing reservation with matching"
1203                         " key 0x%016Lx is present from another SCSI Initiator"
1204                         " Port\n", pr_reg->pr_res_key);
1205                 ret = -EPERM;
1206         }
1207         spin_unlock(&dev->dev_reservation_lock);
1208
1209         return ret;
1210 }
1211
1212 /*
1213  * Called with struct t10_reservation->registration_lock held.
1214  */
1215 static void __core_scsi3_free_registration(
1216         struct se_device *dev,
1217         struct t10_pr_registration *pr_reg,
1218         struct list_head *preempt_and_abort_list,
1219         int dec_holders)
1220 {
1221         struct target_core_fabric_ops *tfo =
1222                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1223         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1224         char i_buf[PR_REG_ISID_ID_LEN];
1225
1226         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1227         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1228
1229         pr_reg->pr_reg_deve->def_pr_registered = 0;
1230         pr_reg->pr_reg_deve->pr_res_key = 0;
1231         list_del(&pr_reg->pr_reg_list);
1232         /*
1233          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1234          * so call core_scsi3_put_pr_reg() to decrement our reference.
1235          */
1236         if (dec_holders)
1237                 core_scsi3_put_pr_reg(pr_reg);
1238         /*
1239          * Wait until all reference from any other I_T nexuses for this
1240          * *pr_reg have been released.  Because list_del() is called above,
1241          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1242          * count back to zero, and we release *pr_reg.
1243          */
1244         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1245                 spin_unlock(&pr_tmpl->registration_lock);
1246                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1247                                 tfo->get_fabric_name());
1248                 cpu_relax();
1249                 spin_lock(&pr_tmpl->registration_lock);
1250         }
1251
1252         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1253                 " Node: %s%s\n", tfo->get_fabric_name(),
1254                 pr_reg->pr_reg_nacl->initiatorname,
1255                 i_buf);
1256         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1257                 " Port(s)\n", tfo->get_fabric_name(),
1258                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1259                 dev->transport->name);
1260         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1261                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1262                 pr_reg->pr_res_generation);
1263
1264         if (!preempt_and_abort_list) {
1265                 pr_reg->pr_reg_deve = NULL;
1266                 pr_reg->pr_reg_nacl = NULL;
1267                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1268                 return;
1269         }
1270         /*
1271          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1272          * are released once the ABORT_TASK_SET has completed..
1273          */
1274         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1275 }
1276
1277 void core_scsi3_free_pr_reg_from_nacl(
1278         struct se_device *dev,
1279         struct se_node_acl *nacl)
1280 {
1281         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1282         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1283         /*
1284          * If the passed se_node_acl matches the reservation holder,
1285          * release the reservation.
1286          */
1287         spin_lock(&dev->dev_reservation_lock);
1288         pr_res_holder = dev->dev_pr_res_holder;
1289         if ((pr_res_holder != NULL) &&
1290             (pr_res_holder->pr_reg_nacl == nacl))
1291                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1292         spin_unlock(&dev->dev_reservation_lock);
1293         /*
1294          * Release any registration associated with the struct se_node_acl.
1295          */
1296         spin_lock(&pr_tmpl->registration_lock);
1297         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1298                         &pr_tmpl->registration_list, pr_reg_list) {
1299
1300                 if (pr_reg->pr_reg_nacl != nacl)
1301                         continue;
1302
1303                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1304         }
1305         spin_unlock(&pr_tmpl->registration_lock);
1306 }
1307
1308 void core_scsi3_free_all_registrations(
1309         struct se_device *dev)
1310 {
1311         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1312         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1313
1314         spin_lock(&dev->dev_reservation_lock);
1315         pr_res_holder = dev->dev_pr_res_holder;
1316         if (pr_res_holder != NULL) {
1317                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1318                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1319                                 pr_res_holder, 0);
1320         }
1321         spin_unlock(&dev->dev_reservation_lock);
1322
1323         spin_lock(&pr_tmpl->registration_lock);
1324         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1325                         &pr_tmpl->registration_list, pr_reg_list) {
1326
1327                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1328         }
1329         spin_unlock(&pr_tmpl->registration_lock);
1330
1331         spin_lock(&pr_tmpl->aptpl_reg_lock);
1332         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1333                                 pr_reg_aptpl_list) {
1334                 list_del(&pr_reg->pr_reg_aptpl_list);
1335                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1336         }
1337         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1338 }
1339
1340 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1341 {
1342         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1343                         &tpg->tpg_group.cg_item);
1344 }
1345
1346 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1347 {
1348         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1349                         &tpg->tpg_group.cg_item);
1350
1351         atomic_dec(&tpg->tpg_pr_ref_count);
1352         smp_mb__after_atomic_dec();
1353 }
1354
1355 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1356 {
1357         struct se_portal_group *tpg = nacl->se_tpg;
1358
1359         if (nacl->dynamic_node_acl)
1360                 return 0;
1361
1362         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1363                         &nacl->acl_group.cg_item);
1364 }
1365
1366 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1367 {
1368         struct se_portal_group *tpg = nacl->se_tpg;
1369
1370         if (nacl->dynamic_node_acl) {
1371                 atomic_dec(&nacl->acl_pr_ref_count);
1372                 smp_mb__after_atomic_dec();
1373                 return;
1374         }
1375
1376         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1377                         &nacl->acl_group.cg_item);
1378
1379         atomic_dec(&nacl->acl_pr_ref_count);
1380         smp_mb__after_atomic_dec();
1381 }
1382
1383 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1384 {
1385         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1386         struct se_node_acl *nacl;
1387         struct se_portal_group *tpg;
1388         /*
1389          * For nacl->dynamic_node_acl=1
1390          */
1391         if (!lun_acl)
1392                 return 0;
1393
1394         nacl = lun_acl->se_lun_nacl;
1395         tpg = nacl->se_tpg;
1396
1397         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1398                         &lun_acl->se_lun_group.cg_item);
1399 }
1400
1401 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1402 {
1403         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1404         struct se_node_acl *nacl;
1405         struct se_portal_group *tpg;
1406         /*
1407          * For nacl->dynamic_node_acl=1
1408          */
1409         if (!lun_acl) {
1410                 atomic_dec(&se_deve->pr_ref_count);
1411                 smp_mb__after_atomic_dec();
1412                 return;
1413         }
1414         nacl = lun_acl->se_lun_nacl;
1415         tpg = nacl->se_tpg;
1416
1417         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1418                         &lun_acl->se_lun_group.cg_item);
1419
1420         atomic_dec(&se_deve->pr_ref_count);
1421         smp_mb__after_atomic_dec();
1422 }
1423
1424 static sense_reason_t
1425 core_scsi3_decode_spec_i_port(
1426         struct se_cmd *cmd,
1427         struct se_portal_group *tpg,
1428         unsigned char *l_isid,
1429         u64 sa_res_key,
1430         int all_tg_pt,
1431         int aptpl)
1432 {
1433         struct se_device *dev = cmd->se_dev;
1434         struct se_port *tmp_port;
1435         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1436         struct se_session *se_sess = cmd->se_sess;
1437         struct se_node_acl *dest_node_acl = NULL;
1438         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1439         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1440         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1441         LIST_HEAD(tid_dest_list);
1442         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1443         struct target_core_fabric_ops *tmp_tf_ops;
1444         unsigned char *buf;
1445         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1446         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1447         sense_reason_t ret;
1448         u32 tpdl, tid_len = 0;
1449         int dest_local_nexus;
1450         u32 dest_rtpi = 0;
1451
1452         memset(dest_iport, 0, 64);
1453
1454         local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1455         /*
1456          * Allocate a struct pr_transport_id_holder and setup the
1457          * local_node_acl and local_se_deve pointers and add to
1458          * struct list_head tid_dest_list for add registration
1459          * processing in the loop of tid_dest_list below.
1460          */
1461         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1462         if (!tidh_new) {
1463                 pr_err("Unable to allocate tidh_new\n");
1464                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1465         }
1466         INIT_LIST_HEAD(&tidh_new->dest_list);
1467         tidh_new->dest_tpg = tpg;
1468         tidh_new->dest_node_acl = se_sess->se_node_acl;
1469         tidh_new->dest_se_deve = local_se_deve;
1470
1471         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1472                                 se_sess->se_node_acl, local_se_deve, l_isid,
1473                                 sa_res_key, all_tg_pt, aptpl);
1474         if (!local_pr_reg) {
1475                 kfree(tidh_new);
1476                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1477         }
1478         tidh_new->dest_pr_reg = local_pr_reg;
1479         /*
1480          * The local I_T nexus does not hold any configfs dependances,
1481          * so we set tid_h->dest_local_nexus=1 to prevent the
1482          * configfs_undepend_item() calls in the tid_dest_list loops below.
1483          */
1484         tidh_new->dest_local_nexus = 1;
1485         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1486
1487         if (cmd->data_length < 28) {
1488                 pr_warn("SPC-PR: Received PR OUT parameter list"
1489                         " length too small: %u\n", cmd->data_length);
1490                 ret = TCM_INVALID_PARAMETER_LIST;
1491                 goto out;
1492         }
1493
1494         buf = transport_kmap_data_sg(cmd);
1495         if (!buf) {
1496                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1497                 goto out;
1498         }
1499
1500         /*
1501          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1502          * first extract TransportID Parameter Data Length, and make sure
1503          * the value matches up to the SCSI expected data transfer length.
1504          */
1505         tpdl = (buf[24] & 0xff) << 24;
1506         tpdl |= (buf[25] & 0xff) << 16;
1507         tpdl |= (buf[26] & 0xff) << 8;
1508         tpdl |= buf[27] & 0xff;
1509
1510         if ((tpdl + 28) != cmd->data_length) {
1511                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1512                         " does not equal CDB data_length: %u\n", tpdl,
1513                         cmd->data_length);
1514                 ret = TCM_INVALID_PARAMETER_LIST;
1515                 goto out_unmap;
1516         }
1517         /*
1518          * Start processing the received transport IDs using the
1519          * receiving I_T Nexus portal's fabric dependent methods to
1520          * obtain the SCSI Initiator Port/Device Identifiers.
1521          */
1522         ptr = &buf[28];
1523
1524         while (tpdl > 0) {
1525                 proto_ident = (ptr[0] & 0x0f);
1526                 dest_tpg = NULL;
1527
1528                 spin_lock(&dev->se_port_lock);
1529                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1530                         tmp_tpg = tmp_port->sep_tpg;
1531                         if (!tmp_tpg)
1532                                 continue;
1533                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1534                         if (!tmp_tf_ops)
1535                                 continue;
1536                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1537                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1538                                 continue;
1539                         /*
1540                          * Look for the matching proto_ident provided by
1541                          * the received TransportID
1542                          */
1543                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1544                         if (tmp_proto_ident != proto_ident)
1545                                 continue;
1546                         dest_rtpi = tmp_port->sep_rtpi;
1547
1548                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1549                                         tmp_tpg, (const char *)ptr, &tid_len,
1550                                         &iport_ptr);
1551                         if (!i_str)
1552                                 continue;
1553
1554                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1555                         smp_mb__after_atomic_inc();
1556                         spin_unlock(&dev->se_port_lock);
1557
1558                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1559                                 pr_err(" core_scsi3_tpg_depend_item()"
1560                                         " for tmp_tpg\n");
1561                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1562                                 smp_mb__after_atomic_dec();
1563                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1564                                 goto out_unmap;
1565                         }
1566                         /*
1567                          * Locate the destination initiator ACL to be registered
1568                          * from the decoded fabric module specific TransportID
1569                          * at *i_str.
1570                          */
1571                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1572                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1573                                                 tmp_tpg, i_str);
1574                         if (dest_node_acl) {
1575                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1576                                 smp_mb__after_atomic_inc();
1577                         }
1578                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1579
1580                         if (!dest_node_acl) {
1581                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1582                                 spin_lock(&dev->se_port_lock);
1583                                 continue;
1584                         }
1585
1586                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1587                                 pr_err("configfs_depend_item() failed"
1588                                         " for dest_node_acl->acl_group\n");
1589                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1590                                 smp_mb__after_atomic_dec();
1591                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1592                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1593                                 goto out_unmap;
1594                         }
1595
1596                         dest_tpg = tmp_tpg;
1597                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1598                                 " %s Port RTPI: %hu\n",
1599                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1600                                 dest_node_acl->initiatorname, dest_rtpi);
1601
1602                         spin_lock(&dev->se_port_lock);
1603                         break;
1604                 }
1605                 spin_unlock(&dev->se_port_lock);
1606
1607                 if (!dest_tpg) {
1608                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1609                                         " dest_tpg\n");
1610                         ret = TCM_INVALID_PARAMETER_LIST;
1611                         goto out_unmap;
1612                 }
1613
1614                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1615                         " tid_len: %d for %s + %s\n",
1616                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1617                         tpdl, tid_len, i_str, iport_ptr);
1618
1619                 if (tid_len > tpdl) {
1620                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1621                                 " %u for Transport ID: %s\n", tid_len, ptr);
1622                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1623                         core_scsi3_tpg_undepend_item(dest_tpg);
1624                         ret = TCM_INVALID_PARAMETER_LIST;
1625                         goto out_unmap;
1626                 }
1627                 /*
1628                  * Locate the desintation struct se_dev_entry pointer for matching
1629                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1630                  * Target Port.
1631                  */
1632                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1633                                         dest_rtpi);
1634                 if (!dest_se_deve) {
1635                         pr_err("Unable to locate %s dest_se_deve"
1636                                 " from destination RTPI: %hu\n",
1637                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1638                                 dest_rtpi);
1639
1640                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1641                         core_scsi3_tpg_undepend_item(dest_tpg);
1642                         ret = TCM_INVALID_PARAMETER_LIST;
1643                         goto out_unmap;
1644                 }
1645
1646                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1647                         pr_err("core_scsi3_lunacl_depend_item()"
1648                                         " failed\n");
1649                         atomic_dec(&dest_se_deve->pr_ref_count);
1650                         smp_mb__after_atomic_dec();
1651                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1652                         core_scsi3_tpg_undepend_item(dest_tpg);
1653                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1654                         goto out_unmap;
1655                 }
1656
1657                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1658                         " dest_se_deve mapped_lun: %u\n",
1659                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1660                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1661
1662                 /*
1663                  * Skip any TransportIDs that already have a registration for
1664                  * this target port.
1665                  */
1666                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1667                                         iport_ptr);
1668                 if (pr_reg_e) {
1669                         core_scsi3_put_pr_reg(pr_reg_e);
1670                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1671                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672                         core_scsi3_tpg_undepend_item(dest_tpg);
1673                         ptr += tid_len;
1674                         tpdl -= tid_len;
1675                         tid_len = 0;
1676                         continue;
1677                 }
1678                 /*
1679                  * Allocate a struct pr_transport_id_holder and setup
1680                  * the dest_node_acl and dest_se_deve pointers for the
1681                  * loop below.
1682                  */
1683                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1684                                 GFP_KERNEL);
1685                 if (!tidh_new) {
1686                         pr_err("Unable to allocate tidh_new\n");
1687                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1688                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1689                         core_scsi3_tpg_undepend_item(dest_tpg);
1690                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1691                         goto out_unmap;
1692                 }
1693                 INIT_LIST_HEAD(&tidh_new->dest_list);
1694                 tidh_new->dest_tpg = dest_tpg;
1695                 tidh_new->dest_node_acl = dest_node_acl;
1696                 tidh_new->dest_se_deve = dest_se_deve;
1697
1698                 /*
1699                  * Allocate, but do NOT add the registration for the
1700                  * TransportID referenced SCSI Initiator port.  This
1701                  * done because of the following from spc4r17 in section
1702                  * 6.14.3 wrt SPEC_I_PT:
1703                  *
1704                  * "If a registration fails for any initiator port (e.g., if th
1705                  * logical unit does not have enough resources available to
1706                  * hold the registration information), no registrations shall be
1707                  * made, and the command shall be terminated with
1708                  * CHECK CONDITION status."
1709                  *
1710                  * That means we call __core_scsi3_alloc_registration() here,
1711                  * and then call __core_scsi3_add_registration() in the
1712                  * 2nd loop which will never fail.
1713                  */
1714                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1715                                 dest_node_acl, dest_se_deve, iport_ptr,
1716                                 sa_res_key, all_tg_pt, aptpl);
1717                 if (!dest_pr_reg) {
1718                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1719                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720                         core_scsi3_tpg_undepend_item(dest_tpg);
1721                         kfree(tidh_new);
1722                         ret = TCM_INVALID_PARAMETER_LIST;
1723                         goto out_unmap;
1724                 }
1725                 tidh_new->dest_pr_reg = dest_pr_reg;
1726                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1727
1728                 ptr += tid_len;
1729                 tpdl -= tid_len;
1730                 tid_len = 0;
1731
1732         }
1733
1734         transport_kunmap_data_sg(cmd);
1735
1736         /*
1737          * Go ahead and create a registrations from tid_dest_list for the
1738          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1739          * and dest_se_deve.
1740          *
1741          * The SA Reservation Key from the PROUT is set for the
1742          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1743          * means that the TransportID Initiator port will be
1744          * registered on all of the target ports in the SCSI target device
1745          * ALL_TG_PT=0 means the registration will only be for the
1746          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1747          * was received.
1748          */
1749         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1750                 dest_tpg = tidh->dest_tpg;
1751                 dest_node_acl = tidh->dest_node_acl;
1752                 dest_se_deve = tidh->dest_se_deve;
1753                 dest_pr_reg = tidh->dest_pr_reg;
1754                 dest_local_nexus = tidh->dest_local_nexus;
1755
1756                 list_del(&tidh->dest_list);
1757                 kfree(tidh);
1758
1759                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1760                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1761
1762                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1763                                         dest_pr_reg, 0, 0);
1764
1765                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1766                         " registered Transport ID for Node: %s%s Mapped LUN:"
1767                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1768                         dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
1769
1770                 if (dest_local_nexus)
1771                         continue;
1772
1773                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1774                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1775                 core_scsi3_tpg_undepend_item(dest_tpg);
1776         }
1777
1778         return 0;
1779 out_unmap:
1780         transport_kunmap_data_sg(cmd);
1781 out:
1782         /*
1783          * For the failure case, release everything from tid_dest_list
1784          * including *dest_pr_reg and the configfs dependances..
1785          */
1786         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1787                 dest_tpg = tidh->dest_tpg;
1788                 dest_node_acl = tidh->dest_node_acl;
1789                 dest_se_deve = tidh->dest_se_deve;
1790                 dest_pr_reg = tidh->dest_pr_reg;
1791                 dest_local_nexus = tidh->dest_local_nexus;
1792
1793                 list_del(&tidh->dest_list);
1794                 kfree(tidh);
1795                 /*
1796                  * Release any extra ALL_TG_PT=1 registrations for
1797                  * the SPEC_I_PT=1 case.
1798                  */
1799                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1800                                 &dest_pr_reg->pr_reg_atp_list,
1801                                 pr_reg_atp_mem_list) {
1802                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1803                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1804                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1805                 }
1806
1807                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1808
1809                 if (dest_local_nexus)
1810                         continue;
1811
1812                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1813                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1814                 core_scsi3_tpg_undepend_item(dest_tpg);
1815         }
1816         return ret;
1817 }
1818
1819 static int core_scsi3_update_aptpl_buf(
1820         struct se_device *dev,
1821         unsigned char *buf,
1822         u32 pr_aptpl_buf_len)
1823 {
1824         struct se_lun *lun;
1825         struct se_portal_group *tpg;
1826         struct t10_pr_registration *pr_reg;
1827         unsigned char tmp[512], isid_buf[32];
1828         ssize_t len = 0;
1829         int reg_count = 0;
1830         int ret = 0;
1831
1832         spin_lock(&dev->dev_reservation_lock);
1833         spin_lock(&dev->t10_pr.registration_lock);
1834         /*
1835          * Walk the registration list..
1836          */
1837         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1838                         pr_reg_list) {
1839
1840                 tmp[0] = '\0';
1841                 isid_buf[0] = '\0';
1842                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1843                 lun = pr_reg->pr_reg_tg_pt_lun;
1844                 /*
1845                  * Write out any ISID value to APTPL metadata that was included
1846                  * in the original registration.
1847                  */
1848                 if (pr_reg->isid_present_at_reg)
1849                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1850                                         pr_reg->pr_reg_isid);
1851                 /*
1852                  * Include special metadata if the pr_reg matches the
1853                  * reservation holder.
1854                  */
1855                 if (dev->dev_pr_res_holder == pr_reg) {
1856                         snprintf(tmp, 512, "PR_REG_START: %d"
1857                                 "\ninitiator_fabric=%s\n"
1858                                 "initiator_node=%s\n%s"
1859                                 "sa_res_key=%llu\n"
1860                                 "res_holder=1\nres_type=%02x\n"
1861                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1862                                 "mapped_lun=%u\n", reg_count,
1863                                 tpg->se_tpg_tfo->get_fabric_name(),
1864                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1865                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1866                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1867                                 pr_reg->pr_res_mapped_lun);
1868                 } else {
1869                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1870                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1871                                 "sa_res_key=%llu\nres_holder=0\n"
1872                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1873                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1874                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1875                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1876                                 pr_reg->pr_res_mapped_lun);
1877                 }
1878
1879                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1880                         pr_err("Unable to update renaming"
1881                                 " APTPL metadata\n");
1882                         ret = -EMSGSIZE;
1883                         goto out;
1884                 }
1885                 len += sprintf(buf+len, "%s", tmp);
1886
1887                 /*
1888                  * Include information about the associated SCSI target port.
1889                  */
1890                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1891                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1892                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1893                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1894                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1895                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1896
1897                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1898                         pr_err("Unable to update renaming"
1899                                 " APTPL metadata\n");
1900                         ret = -EMSGSIZE;
1901                         goto out;
1902                 }
1903                 len += sprintf(buf+len, "%s", tmp);
1904                 reg_count++;
1905         }
1906
1907         if (!reg_count)
1908                 len += sprintf(buf+len, "No Registrations or Reservations");
1909
1910 out:
1911         spin_unlock(&dev->t10_pr.registration_lock);
1912         spin_unlock(&dev->dev_reservation_lock);
1913
1914         return ret;
1915 }
1916
1917 static int __core_scsi3_write_aptpl_to_file(
1918         struct se_device *dev,
1919         unsigned char *buf)
1920 {
1921         struct t10_wwn *wwn = &dev->t10_wwn;
1922         struct file *file;
1923         int flags = O_RDWR | O_CREAT | O_TRUNC;
1924         char path[512];
1925         u32 pr_aptpl_buf_len;
1926         int ret;
1927
1928         memset(path, 0, 512);
1929
1930         if (strlen(&wwn->unit_serial[0]) >= 512) {
1931                 pr_err("WWN value for struct se_device does not fit"
1932                         " into path buffer\n");
1933                 return -EMSGSIZE;
1934         }
1935
1936         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1937         file = filp_open(path, flags, 0600);
1938         if (IS_ERR(file)) {
1939                 pr_err("filp_open(%s) for APTPL metadata"
1940                         " failed\n", path);
1941                 return PTR_ERR(file);
1942         }
1943
1944         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1945
1946         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1947
1948         if (ret < 0)
1949                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1950         fput(file);
1951
1952         return (ret < 0) ? -EIO : 0;
1953 }
1954
1955 /*
1956  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1957  * write out the updated metadata to struct file for this SCSI device.
1958  */
1959 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1960 {
1961         unsigned char *buf;
1962         int rc;
1963
1964         if (!aptpl) {
1965                 char *null_buf = "No Registrations or Reservations\n";
1966
1967                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
1968                 dev->t10_pr.pr_aptpl_active = 0;
1969                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
1970
1971                 if (rc)
1972                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1973
1974                 return 0;
1975         }
1976
1977         buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
1978         if (!buf)
1979                 return TCM_OUT_OF_RESOURCES;
1980
1981         rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN);
1982         if (rc < 0) {
1983                 kfree(buf);
1984                 return TCM_OUT_OF_RESOURCES;
1985         }
1986
1987         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1988         if (rc != 0) {
1989                 pr_err("SPC-3 PR: Could not update APTPL\n");
1990                 kfree(buf);
1991                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1992         }
1993         dev->t10_pr.pr_aptpl_active = 1;
1994         kfree(buf);
1995         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1996         return 0;
1997 }
1998
1999 static sense_reason_t
2000 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2001                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2002 {
2003         struct se_session *se_sess = cmd->se_sess;
2004         struct se_device *dev = cmd->se_dev;
2005         struct se_dev_entry *se_deve;
2006         struct se_lun *se_lun = cmd->se_lun;
2007         struct se_portal_group *se_tpg;
2008         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2009         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2010         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2011         sense_reason_t ret = TCM_NO_SENSE;
2012         int pr_holder = 0;
2013
2014         if (!se_sess || !se_lun) {
2015                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2016                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2017         }
2018         se_tpg = se_sess->se_tpg;
2019         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2020
2021         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2022                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2023                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2024                                 PR_REG_ISID_LEN);
2025                 isid_ptr = &isid_buf[0];
2026         }
2027         /*
2028          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2029          */
2030         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2031         if (!pr_reg) {
2032                 if (res_key) {
2033                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2034                                 " for SA REGISTER, returning CONFLICT\n");
2035                         return TCM_RESERVATION_CONFLICT;
2036                 }
2037                 /*
2038                  * Do nothing but return GOOD status.
2039                  */
2040                 if (!sa_res_key)
2041                         return 0;
2042
2043                 if (!spec_i_pt) {
2044                         /*
2045                          * Perform the Service Action REGISTER on the Initiator
2046                          * Port Endpoint that the PRO was received from on the
2047                          * Logical Unit of the SCSI device server.
2048                          */
2049                         if (core_scsi3_alloc_registration(cmd->se_dev,
2050                                         se_sess->se_node_acl, se_deve, isid_ptr,
2051                                         sa_res_key, all_tg_pt, aptpl,
2052                                         register_type, 0)) {
2053                                 pr_err("Unable to allocate"
2054                                         " struct t10_pr_registration\n");
2055                                 return TCM_INVALID_PARAMETER_LIST;
2056                         }
2057                 } else {
2058                         /*
2059                          * Register both the Initiator port that received
2060                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2061                          * TransportID from Parameter list and loop through
2062                          * fabric dependent parameter list while calling
2063                          * logic from of core_scsi3_alloc_registration() for
2064                          * each TransportID provided SCSI Initiator Port/Device
2065                          */
2066                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2067                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2068                         if (ret != 0)
2069                                 return ret;
2070                 }
2071
2072                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2073         }
2074
2075         /* ok, existing registration */
2076
2077         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2078                 pr_err("SPC-3 PR REGISTER: Received"
2079                        " res_key: 0x%016Lx does not match"
2080                        " existing SA REGISTER res_key:"
2081                        " 0x%016Lx\n", res_key,
2082                        pr_reg->pr_res_key);
2083                 ret = TCM_RESERVATION_CONFLICT;
2084                 goto out;
2085         }
2086
2087         if (spec_i_pt) {
2088                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2089                         " set on a registered nexus\n");
2090                 ret = TCM_INVALID_PARAMETER_LIST;
2091                 goto out;
2092         }
2093
2094         /*
2095          * An existing ALL_TG_PT=1 registration being released
2096          * must also set ALL_TG_PT=1 in the incoming PROUT.
2097          */
2098         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2099                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2100                         " registration exists, but ALL_TG_PT=1 bit not"
2101                         " present in received PROUT\n");
2102                 ret = TCM_INVALID_CDB_FIELD;
2103                 goto out;
2104         }
2105
2106         /*
2107          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2108          */
2109         if (sa_res_key) {
2110                 /*
2111                  * Increment PRgeneration counter for struct se_device"
2112                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2113                  * READ_KEYS service action.
2114                  */
2115                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2116                 pr_reg->pr_res_key = sa_res_key;
2117                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2118                          " Key for %s to: 0x%016Lx PRgeneration:"
2119                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2120                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2121                          pr_reg->pr_reg_nacl->initiatorname,
2122                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2123
2124         } else {
2125                 /*
2126                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2127                  */
2128                 pr_holder = core_scsi3_check_implicit_release(
2129                                 cmd->se_dev, pr_reg);
2130                 if (pr_holder < 0) {
2131                         ret = TCM_RESERVATION_CONFLICT;
2132                         goto out;
2133                 }
2134
2135                 spin_lock(&pr_tmpl->registration_lock);
2136                 /*
2137                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2138                  * and matching pr_res_key.
2139                  */
2140                 if (pr_reg->pr_reg_all_tg_pt) {
2141                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2142                                         &pr_tmpl->registration_list,
2143                                         pr_reg_list) {
2144
2145                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2146                                         continue;
2147                                 if (pr_reg_p->pr_res_key != res_key)
2148                                         continue;
2149                                 if (pr_reg == pr_reg_p)
2150                                         continue;
2151                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2152                                            pr_reg_p->pr_reg_nacl->initiatorname))
2153                                         continue;
2154
2155                                 __core_scsi3_free_registration(dev,
2156                                                 pr_reg_p, NULL, 0);
2157                         }
2158                 }
2159
2160                 /*
2161                  * Release the calling I_T Nexus registration now..
2162                  */
2163                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2164
2165                 /*
2166                  * From spc4r17, section 5.7.11.3 Unregistering
2167                  *
2168                  * If the persistent reservation is a registrants only
2169                  * type, the device server shall establish a unit
2170                  * attention condition for the initiator port associated
2171                  * with every registered I_T nexus except for the I_T
2172                  * nexus on which the PERSISTENT RESERVE OUT command was
2173                  * received, with the additional sense code set to
2174                  * RESERVATIONS RELEASED.
2175                  */
2176                 if (pr_holder &&
2177                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2178                      pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2179                         list_for_each_entry(pr_reg_p,
2180                                         &pr_tmpl->registration_list,
2181                                         pr_reg_list) {
2182
2183                                 core_scsi3_ua_allocate(
2184                                         pr_reg_p->pr_reg_nacl,
2185                                         pr_reg_p->pr_res_mapped_lun,
2186                                         0x2A,
2187                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2188                         }
2189                 }
2190
2191                 spin_unlock(&pr_tmpl->registration_lock);
2192         }
2193
2194         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2195
2196 out:
2197         core_scsi3_put_pr_reg(pr_reg);
2198         return ret;
2199 }
2200
2201 unsigned char *core_scsi3_pr_dump_type(int type)
2202 {
2203         switch (type) {
2204         case PR_TYPE_WRITE_EXCLUSIVE:
2205                 return "Write Exclusive Access";
2206         case PR_TYPE_EXCLUSIVE_ACCESS:
2207                 return "Exclusive Access";
2208         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2209                 return "Write Exclusive Access, Registrants Only";
2210         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2211                 return "Exclusive Access, Registrants Only";
2212         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2213                 return "Write Exclusive Access, All Registrants";
2214         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2215                 return "Exclusive Access, All Registrants";
2216         default:
2217                 break;
2218         }
2219
2220         return "Unknown SPC-3 PR Type";
2221 }
2222
2223 static sense_reason_t
2224 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2225 {
2226         struct se_device *dev = cmd->se_dev;
2227         struct se_session *se_sess = cmd->se_sess;
2228         struct se_lun *se_lun = cmd->se_lun;
2229         struct t10_pr_registration *pr_reg, *pr_res_holder;
2230         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2231         char i_buf[PR_REG_ISID_ID_LEN];
2232         sense_reason_t ret;
2233
2234         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2235
2236         if (!se_sess || !se_lun) {
2237                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2238                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2239         }
2240         /*
2241          * Locate the existing *pr_reg via struct se_node_acl pointers
2242          */
2243         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2244                                 se_sess);
2245         if (!pr_reg) {
2246                 pr_err("SPC-3 PR: Unable to locate"
2247                         " PR_REGISTERED *pr_reg for RESERVE\n");
2248                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2249         }
2250         /*
2251          * From spc4r17 Section 5.7.9: Reserving:
2252          *
2253          * An application client creates a persistent reservation by issuing
2254          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2255          * a registered I_T nexus with the following parameters:
2256          *    a) RESERVATION KEY set to the value of the reservation key that is
2257          *       registered with the logical unit for the I_T nexus; and
2258          */
2259         if (res_key != pr_reg->pr_res_key) {
2260                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2261                         " does not match existing SA REGISTER res_key:"
2262                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2263                 ret = TCM_RESERVATION_CONFLICT;
2264                 goto out_put_pr_reg;
2265         }
2266         /*
2267          * From spc4r17 Section 5.7.9: Reserving:
2268          *
2269          * From above:
2270          *  b) TYPE field and SCOPE field set to the persistent reservation
2271          *     being created.
2272          *
2273          * Only one persistent reservation is allowed at a time per logical unit
2274          * and that persistent reservation has a scope of LU_SCOPE.
2275          */
2276         if (scope != PR_SCOPE_LU_SCOPE) {
2277                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2278                 ret = TCM_INVALID_PARAMETER_LIST;
2279                 goto out_put_pr_reg;
2280         }
2281         /*
2282          * See if we have an existing PR reservation holder pointer at
2283          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2284          * *pr_res_holder.
2285          */
2286         spin_lock(&dev->dev_reservation_lock);
2287         pr_res_holder = dev->dev_pr_res_holder;
2288         if (pr_res_holder) {
2289                 /*
2290                  * From spc4r17 Section 5.7.9: Reserving:
2291                  *
2292                  * If the device server receives a PERSISTENT RESERVE OUT
2293                  * command from an I_T nexus other than a persistent reservation
2294                  * holder (see 5.7.10) that attempts to create a persistent
2295                  * reservation when a persistent reservation already exists for
2296                  * the logical unit, then the command shall be completed with
2297                  * RESERVATION CONFLICT status.
2298                  */
2299                 if (pr_res_holder != pr_reg) {
2300                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2301                         pr_err("SPC-3 PR: Attempted RESERVE from"
2302                                 " [%s]: %s while reservation already held by"
2303                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2304                                 cmd->se_tfo->get_fabric_name(),
2305                                 se_sess->se_node_acl->initiatorname,
2306                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2307                                 pr_res_holder->pr_reg_nacl->initiatorname);
2308
2309                         spin_unlock(&dev->dev_reservation_lock);
2310                         ret = TCM_RESERVATION_CONFLICT;
2311                         goto out_put_pr_reg;
2312                 }
2313                 /*
2314                  * From spc4r17 Section 5.7.9: Reserving:
2315                  *
2316                  * If a persistent reservation holder attempts to modify the
2317                  * type or scope of an existing persistent reservation, the
2318                  * command shall be completed with RESERVATION CONFLICT status.
2319                  */
2320                 if ((pr_res_holder->pr_res_type != type) ||
2321                     (pr_res_holder->pr_res_scope != scope)) {
2322                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2323                         pr_err("SPC-3 PR: Attempted RESERVE from"
2324                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2325                                 " while reservation already held by [%s]: %s,"
2326                                 " returning RESERVATION_CONFLICT\n",
2327                                 cmd->se_tfo->get_fabric_name(),
2328                                 se_sess->se_node_acl->initiatorname,
2329                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2330                                 pr_res_holder->pr_reg_nacl->initiatorname);
2331
2332                         spin_unlock(&dev->dev_reservation_lock);
2333                         ret = TCM_RESERVATION_CONFLICT;
2334                         goto out_put_pr_reg;
2335                 }
2336                 /*
2337                  * From spc4r17 Section 5.7.9: Reserving:
2338                  *
2339                  * If the device server receives a PERSISTENT RESERVE OUT
2340                  * command with RESERVE service action where the TYPE field and
2341                  * the SCOPE field contain the same values as the existing type
2342                  * and scope from a persistent reservation holder, it shall not
2343                  * make any change to the existing persistent reservation and
2344                  * shall completethe command with GOOD status.
2345                  */
2346                 spin_unlock(&dev->dev_reservation_lock);
2347                 ret = 0;
2348                 goto out_put_pr_reg;
2349         }
2350         /*
2351          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2352          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2353          */
2354         pr_reg->pr_res_scope = scope;
2355         pr_reg->pr_res_type = type;
2356         pr_reg->pr_res_holder = 1;
2357         dev->dev_pr_res_holder = pr_reg;
2358         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2359
2360         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2361                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2362                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2363                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2364         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2365                         cmd->se_tfo->get_fabric_name(),
2366                         se_sess->se_node_acl->initiatorname,
2367                         i_buf);
2368         spin_unlock(&dev->dev_reservation_lock);
2369
2370         if (pr_tmpl->pr_aptpl_active)
2371                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2372
2373         ret = 0;
2374 out_put_pr_reg:
2375         core_scsi3_put_pr_reg(pr_reg);
2376         return ret;
2377 }
2378
2379 static sense_reason_t
2380 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2381                 u64 res_key)
2382 {
2383         switch (type) {
2384         case PR_TYPE_WRITE_EXCLUSIVE:
2385         case PR_TYPE_EXCLUSIVE_ACCESS:
2386         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2387         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2388         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2389         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2390                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2391         default:
2392                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2393                         " 0x%02x\n", type);
2394                 return TCM_INVALID_CDB_FIELD;
2395         }
2396 }
2397
2398 /*
2399  * Called with struct se_device->dev_reservation_lock held.
2400  */
2401 static void __core_scsi3_complete_pro_release(
2402         struct se_device *dev,
2403         struct se_node_acl *se_nacl,
2404         struct t10_pr_registration *pr_reg,
2405         int explicit)
2406 {
2407         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2408         char i_buf[PR_REG_ISID_ID_LEN];
2409
2410         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2411         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2412         /*
2413          * Go ahead and release the current PR reservation holder.
2414          */
2415         dev->dev_pr_res_holder = NULL;
2416
2417         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2418                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2419                 tfo->get_fabric_name(), (explicit) ? "explicit" : "implicit",
2420                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2421                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2422         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2423                 tfo->get_fabric_name(), se_nacl->initiatorname,
2424                 i_buf);
2425         /*
2426          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2427          */
2428         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2429 }
2430
2431 static sense_reason_t
2432 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2433                 u64 res_key)
2434 {
2435         struct se_device *dev = cmd->se_dev;
2436         struct se_session *se_sess = cmd->se_sess;
2437         struct se_lun *se_lun = cmd->se_lun;
2438         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2439         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2440         int all_reg = 0;
2441         sense_reason_t ret = 0;
2442
2443         if (!se_sess || !se_lun) {
2444                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2445                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2446         }
2447         /*
2448          * Locate the existing *pr_reg via struct se_node_acl pointers
2449          */
2450         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2451         if (!pr_reg) {
2452                 pr_err("SPC-3 PR: Unable to locate"
2453                         " PR_REGISTERED *pr_reg for RELEASE\n");
2454                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2455         }
2456         /*
2457          * From spc4r17 Section 5.7.11.2 Releasing:
2458          *
2459          * If there is no persistent reservation or in response to a persistent
2460          * reservation release request from a registered I_T nexus that is not a
2461          * persistent reservation holder (see 5.7.10), the device server shall
2462          * do the following:
2463          *
2464          *     a) Not release the persistent reservation, if any;
2465          *     b) Not remove any registrations; and
2466          *     c) Complete the command with GOOD status.
2467          */
2468         spin_lock(&dev->dev_reservation_lock);
2469         pr_res_holder = dev->dev_pr_res_holder;
2470         if (!pr_res_holder) {
2471                 /*
2472                  * No persistent reservation, return GOOD status.
2473                  */
2474                 spin_unlock(&dev->dev_reservation_lock);
2475                 goto out_put_pr_reg;
2476         }
2477         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2478             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2479                 all_reg = 1;
2480
2481         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2482                 /*
2483                  * Non 'All Registrants' PR Type cases..
2484                  * Release request from a registered I_T nexus that is not a
2485                  * persistent reservation holder. return GOOD status.
2486                  */
2487                 spin_unlock(&dev->dev_reservation_lock);
2488                 goto out_put_pr_reg;
2489         }
2490
2491         /*
2492          * From spc4r17 Section 5.7.11.2 Releasing:
2493          *
2494          * Only the persistent reservation holder (see 5.7.10) is allowed to
2495          * release a persistent reservation.
2496          *
2497          * An application client releases the persistent reservation by issuing
2498          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2499          * an I_T nexus that is a persistent reservation holder with the
2500          * following parameters:
2501          *
2502          *     a) RESERVATION KEY field set to the value of the reservation key
2503          *        that is registered with the logical unit for the I_T nexus;
2504          */
2505         if (res_key != pr_reg->pr_res_key) {
2506                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2507                         " does not match existing SA REGISTER res_key:"
2508                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2509                 spin_unlock(&dev->dev_reservation_lock);
2510                 ret = TCM_RESERVATION_CONFLICT;
2511                 goto out_put_pr_reg;
2512         }
2513         /*
2514          * From spc4r17 Section 5.7.11.2 Releasing and above:
2515          *
2516          * b) TYPE field and SCOPE field set to match the persistent
2517          *    reservation being released.
2518          */
2519         if ((pr_res_holder->pr_res_type != type) ||
2520             (pr_res_holder->pr_res_scope != scope)) {
2521                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2522                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2523                         " reservation from [%s]: %s with different TYPE "
2524                         "and/or SCOPE  while reservation already held by"
2525                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2526                         cmd->se_tfo->get_fabric_name(),
2527                         se_sess->se_node_acl->initiatorname,
2528                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2529                         pr_res_holder->pr_reg_nacl->initiatorname);
2530
2531                 spin_unlock(&dev->dev_reservation_lock);
2532                 ret = TCM_RESERVATION_CONFLICT;
2533                 goto out_put_pr_reg;
2534         }
2535         /*
2536          * In response to a persistent reservation release request from the
2537          * persistent reservation holder the device server shall perform a
2538          * release by doing the following as an uninterrupted series of actions:
2539          * a) Release the persistent reservation;
2540          * b) Not remove any registration(s);
2541          * c) If the released persistent reservation is a registrants only type
2542          * or all registrants type persistent reservation,
2543          *    the device server shall establish a unit attention condition for
2544          *    the initiator port associated with every regis-
2545          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2546          *    RESERVE OUT command with RELEASE service action was received,
2547          *    with the additional sense code set to RESERVATIONS RELEASED; and
2548          * d) If the persistent reservation is of any other type, the device
2549          *    server shall not establish a unit attention condition.
2550          */
2551         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2552                         pr_reg, 1);
2553
2554         spin_unlock(&dev->dev_reservation_lock);
2555
2556         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2557             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2558             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2559             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2560                 /*
2561                  * If no UNIT ATTENTION conditions will be established for
2562                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2563                  * go ahead and check for APTPL=1 update+write below
2564                  */
2565                 goto write_aptpl;
2566         }
2567
2568         spin_lock(&pr_tmpl->registration_lock);
2569         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2570                         pr_reg_list) {
2571                 /*
2572                  * Do not establish a UNIT ATTENTION condition
2573                  * for the calling I_T Nexus
2574                  */
2575                 if (pr_reg_p == pr_reg)
2576                         continue;
2577
2578                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2579                                 pr_reg_p->pr_res_mapped_lun,
2580                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2581         }
2582         spin_unlock(&pr_tmpl->registration_lock);
2583
2584 write_aptpl:
2585         if (pr_tmpl->pr_aptpl_active)
2586                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2587
2588 out_put_pr_reg:
2589         core_scsi3_put_pr_reg(pr_reg);
2590         return ret;
2591 }
2592
2593 static sense_reason_t
2594 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2595 {
2596         struct se_device *dev = cmd->se_dev;
2597         struct se_node_acl *pr_reg_nacl;
2598         struct se_session *se_sess = cmd->se_sess;
2599         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2600         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2601         u32 pr_res_mapped_lun = 0;
2602         int calling_it_nexus = 0;
2603         /*
2604          * Locate the existing *pr_reg via struct se_node_acl pointers
2605          */
2606         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2607                         se_sess->se_node_acl, se_sess);
2608         if (!pr_reg_n) {
2609                 pr_err("SPC-3 PR: Unable to locate"
2610                         " PR_REGISTERED *pr_reg for CLEAR\n");
2611                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2612         }
2613         /*
2614          * From spc4r17 section 5.7.11.6, Clearing:
2615          *
2616          * Any application client may release the persistent reservation and
2617          * remove all registrations from a device server by issuing a
2618          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2619          * registered I_T nexus with the following parameter:
2620          *
2621          *      a) RESERVATION KEY field set to the value of the reservation key
2622          *         that is registered with the logical unit for the I_T nexus.
2623          */
2624         if (res_key != pr_reg_n->pr_res_key) {
2625                 pr_err("SPC-3 PR REGISTER: Received"
2626                         " res_key: 0x%016Lx does not match"
2627                         " existing SA REGISTER res_key:"
2628                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2629                 core_scsi3_put_pr_reg(pr_reg_n);
2630                 return TCM_RESERVATION_CONFLICT;
2631         }
2632         /*
2633          * a) Release the persistent reservation, if any;
2634          */
2635         spin_lock(&dev->dev_reservation_lock);
2636         pr_res_holder = dev->dev_pr_res_holder;
2637         if (pr_res_holder) {
2638                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2639                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2640                         pr_res_holder, 0);
2641         }
2642         spin_unlock(&dev->dev_reservation_lock);
2643         /*
2644          * b) Remove all registration(s) (see spc4r17 5.7.7);
2645          */
2646         spin_lock(&pr_tmpl->registration_lock);
2647         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2648                         &pr_tmpl->registration_list, pr_reg_list) {
2649
2650                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2651                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2652                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2653                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2654                                         calling_it_nexus);
2655                 /*
2656                  * e) Establish a unit attention condition for the initiator
2657                  *    port associated with every registered I_T nexus other
2658                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2659                  *    command with CLEAR service action was received, with the
2660                  *    additional sense code set to RESERVATIONS PREEMPTED.
2661                  */
2662                 if (!calling_it_nexus)
2663                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2664                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2665         }
2666         spin_unlock(&pr_tmpl->registration_lock);
2667
2668         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2669                 cmd->se_tfo->get_fabric_name());
2670
2671         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2672
2673         core_scsi3_pr_generation(dev);
2674         return 0;
2675 }
2676
2677 /*
2678  * Called with struct se_device->dev_reservation_lock held.
2679  */
2680 static void __core_scsi3_complete_pro_preempt(
2681         struct se_device *dev,
2682         struct t10_pr_registration *pr_reg,
2683         struct list_head *preempt_and_abort_list,
2684         int type,
2685         int scope,
2686         enum preempt_type preempt_type)
2687 {
2688         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2689         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2690         char i_buf[PR_REG_ISID_ID_LEN];
2691
2692         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2693         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2694         /*
2695          * Do an implicit RELEASE of the existing reservation.
2696          */
2697         if (dev->dev_pr_res_holder)
2698                 __core_scsi3_complete_pro_release(dev, nacl,
2699                                 dev->dev_pr_res_holder, 0);
2700
2701         dev->dev_pr_res_holder = pr_reg;
2702         pr_reg->pr_res_holder = 1;
2703         pr_reg->pr_res_type = type;
2704         pr_reg->pr_res_scope = scope;
2705
2706         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2707                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2708                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2709                 core_scsi3_pr_dump_type(type),
2710                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2711         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2712                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2713                 nacl->initiatorname, i_buf);
2714         /*
2715          * For PREEMPT_AND_ABORT, add the preempting reservation's
2716          * struct t10_pr_registration to the list that will be compared
2717          * against received CDBs..
2718          */
2719         if (preempt_and_abort_list)
2720                 list_add_tail(&pr_reg->pr_reg_abort_list,
2721                                 preempt_and_abort_list);
2722 }
2723
2724 static void core_scsi3_release_preempt_and_abort(
2725         struct list_head *preempt_and_abort_list,
2726         struct t10_pr_registration *pr_reg_holder)
2727 {
2728         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2729
2730         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2731                                 pr_reg_abort_list) {
2732
2733                 list_del(&pr_reg->pr_reg_abort_list);
2734                 if (pr_reg_holder == pr_reg)
2735                         continue;
2736                 if (pr_reg->pr_res_holder) {
2737                         pr_warn("pr_reg->pr_res_holder still set\n");
2738                         continue;
2739                 }
2740
2741                 pr_reg->pr_reg_deve = NULL;
2742                 pr_reg->pr_reg_nacl = NULL;
2743                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2744         }
2745 }
2746
2747 static sense_reason_t
2748 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2749                 u64 sa_res_key, enum preempt_type preempt_type)
2750 {
2751         struct se_device *dev = cmd->se_dev;
2752         struct se_node_acl *pr_reg_nacl;
2753         struct se_session *se_sess = cmd->se_sess;
2754         LIST_HEAD(preempt_and_abort_list);
2755         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2756         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2757         u32 pr_res_mapped_lun = 0;
2758         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2759         int prh_type = 0, prh_scope = 0;
2760
2761         if (!se_sess)
2762                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2763
2764         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2765                                 se_sess);
2766         if (!pr_reg_n) {
2767                 pr_err("SPC-3 PR: Unable to locate"
2768                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2769                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2770                 return TCM_RESERVATION_CONFLICT;
2771         }
2772         if (pr_reg_n->pr_res_key != res_key) {
2773                 core_scsi3_put_pr_reg(pr_reg_n);
2774                 return TCM_RESERVATION_CONFLICT;
2775         }
2776         if (scope != PR_SCOPE_LU_SCOPE) {
2777                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2778                 core_scsi3_put_pr_reg(pr_reg_n);
2779                 return TCM_INVALID_PARAMETER_LIST;
2780         }
2781
2782         spin_lock(&dev->dev_reservation_lock);
2783         pr_res_holder = dev->dev_pr_res_holder;
2784         if (pr_res_holder &&
2785            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2786             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2787                 all_reg = 1;
2788
2789         if (!all_reg && !sa_res_key) {
2790                 spin_unlock(&dev->dev_reservation_lock);
2791                 core_scsi3_put_pr_reg(pr_reg_n);
2792                 return TCM_INVALID_PARAMETER_LIST;
2793         }
2794         /*
2795          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2796          *
2797          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2798          * persistent reservation holder or there is no persistent reservation
2799          * holder (i.e., there is no persistent reservation), then the device
2800          * server shall perform a preempt by doing the following in an
2801          * uninterrupted series of actions. (See below..)
2802          */
2803         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2804                 /*
2805                  * No existing or SA Reservation Key matching reservations..
2806                  *
2807                  * PROUT SA PREEMPT with All Registrant type reservations are
2808                  * allowed to be processed without a matching SA Reservation Key
2809                  */
2810                 spin_lock(&pr_tmpl->registration_lock);
2811                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2812                                 &pr_tmpl->registration_list, pr_reg_list) {
2813                         /*
2814                          * Removing of registrations in non all registrants
2815                          * type reservations without a matching SA reservation
2816                          * key.
2817                          *
2818                          * a) Remove the registrations for all I_T nexuses
2819                          *    specified by the SERVICE ACTION RESERVATION KEY
2820                          *    field;
2821                          * b) Ignore the contents of the SCOPE and TYPE fields;
2822                          * c) Process tasks as defined in 5.7.1; and
2823                          * d) Establish a unit attention condition for the
2824                          *    initiator port associated with every I_T nexus
2825                          *    that lost its registration other than the I_T
2826                          *    nexus on which the PERSISTENT RESERVE OUT command
2827                          *    was received, with the additional sense code set
2828                          *    to REGISTRATIONS PREEMPTED.
2829                          */
2830                         if (!all_reg) {
2831                                 if (pr_reg->pr_res_key != sa_res_key)
2832                                         continue;
2833
2834                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2835                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2836                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2837                                 __core_scsi3_free_registration(dev, pr_reg,
2838                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2839                                                 NULL, calling_it_nexus);
2840                                 released_regs++;
2841                         } else {
2842                                 /*
2843                                  * Case for any existing all registrants type
2844                                  * reservation, follow logic in spc4r17 section
2845                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2846                                  *
2847                                  * For a ZERO SA Reservation key, release
2848                                  * all other registrations and do an implicit
2849                                  * release of active persistent reservation.
2850                                  *
2851                                  * For a non-ZERO SA Reservation key, only
2852                                  * release the matching reservation key from
2853                                  * registrations.
2854                                  */
2855                                 if ((sa_res_key) &&
2856                                      (pr_reg->pr_res_key != sa_res_key))
2857                                         continue;
2858
2859                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2860                                 if (calling_it_nexus)
2861                                         continue;
2862
2863                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2864                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2865                                 __core_scsi3_free_registration(dev, pr_reg,
2866                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2867                                                 NULL, 0);
2868                                 released_regs++;
2869                         }
2870                         if (!calling_it_nexus)
2871                                 core_scsi3_ua_allocate(pr_reg_nacl,
2872                                         pr_res_mapped_lun, 0x2A,
2873                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2874                 }
2875                 spin_unlock(&pr_tmpl->registration_lock);
2876                 /*
2877                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2878                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2879                  * RESERVATION KEY field to a value that does not match any
2880                  * registered reservation key, then the device server shall
2881                  * complete the command with RESERVATION CONFLICT status.
2882                  */
2883                 if (!released_regs) {
2884                         spin_unlock(&dev->dev_reservation_lock);
2885                         core_scsi3_put_pr_reg(pr_reg_n);
2886                         return TCM_RESERVATION_CONFLICT;
2887                 }
2888                 /*
2889                  * For an existing all registrants type reservation
2890                  * with a zero SA rservation key, preempt the existing
2891                  * reservation with the new PR type and scope.
2892                  */
2893                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2894                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2895                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2896                                 type, scope, preempt_type);
2897
2898                         if (preempt_type == PREEMPT_AND_ABORT)
2899                                 core_scsi3_release_preempt_and_abort(
2900                                         &preempt_and_abort_list, pr_reg_n);
2901                 }
2902                 spin_unlock(&dev->dev_reservation_lock);
2903
2904                 if (pr_tmpl->pr_aptpl_active)
2905                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2906
2907                 core_scsi3_put_pr_reg(pr_reg_n);
2908                 core_scsi3_pr_generation(cmd->se_dev);
2909                 return 0;
2910         }
2911         /*
2912          * The PREEMPTing SA reservation key matches that of the
2913          * existing persistent reservation, first, we check if
2914          * we are preempting our own reservation.
2915          * From spc4r17, section 5.7.11.4.3 Preempting
2916          * persistent reservations and registration handling
2917          *
2918          * If an all registrants persistent reservation is not
2919          * present, it is not an error for the persistent
2920          * reservation holder to preempt itself (i.e., a
2921          * PERSISTENT RESERVE OUT with a PREEMPT service action
2922          * or a PREEMPT AND ABORT service action with the
2923          * SERVICE ACTION RESERVATION KEY value equal to the
2924          * persistent reservation holder's reservation key that
2925          * is received from the persistent reservation holder).
2926          * In that case, the device server shall establish the
2927          * new persistent reservation and maintain the
2928          * registration.
2929          */
2930         prh_type = pr_res_holder->pr_res_type;
2931         prh_scope = pr_res_holder->pr_res_scope;
2932         /*
2933          * If the SERVICE ACTION RESERVATION KEY field identifies a
2934          * persistent reservation holder (see 5.7.10), the device
2935          * server shall perform a preempt by doing the following as
2936          * an uninterrupted series of actions:
2937          *
2938          * a) Release the persistent reservation for the holder
2939          *    identified by the SERVICE ACTION RESERVATION KEY field;
2940          */
2941         if (pr_reg_n != pr_res_holder)
2942                 __core_scsi3_complete_pro_release(dev,
2943                                 pr_res_holder->pr_reg_nacl,
2944                                 dev->dev_pr_res_holder, 0);
2945         /*
2946          * b) Remove the registrations for all I_T nexuses identified
2947          *    by the SERVICE ACTION RESERVATION KEY field, except the
2948          *    I_T nexus that is being used for the PERSISTENT RESERVE
2949          *    OUT command. If an all registrants persistent reservation
2950          *    is present and the SERVICE ACTION RESERVATION KEY field
2951          *    is set to zero, then all registrations shall be removed
2952          *    except for that of the I_T nexus that is being used for
2953          *    the PERSISTENT RESERVE OUT command;
2954          */
2955         spin_lock(&pr_tmpl->registration_lock);
2956         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2957                         &pr_tmpl->registration_list, pr_reg_list) {
2958
2959                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2960                 if (calling_it_nexus)
2961                         continue;
2962
2963                 if (pr_reg->pr_res_key != sa_res_key)
2964                         continue;
2965
2966                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2967                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2968                 __core_scsi3_free_registration(dev, pr_reg,
2969                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2970                                 calling_it_nexus);
2971                 /*
2972                  * e) Establish a unit attention condition for the initiator
2973                  *    port associated with every I_T nexus that lost its
2974                  *    persistent reservation and/or registration, with the
2975                  *    additional sense code set to REGISTRATIONS PREEMPTED;
2976                  */
2977                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
2978                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2979         }
2980         spin_unlock(&pr_tmpl->registration_lock);
2981         /*
2982          * c) Establish a persistent reservation for the preempting
2983          *    I_T nexus using the contents of the SCOPE and TYPE fields;
2984          */
2985         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2986                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2987                         type, scope, preempt_type);
2988         /*
2989          * d) Process tasks as defined in 5.7.1;
2990          * e) See above..
2991          * f) If the type or scope has changed, then for every I_T nexus
2992          *    whose reservation key was not removed, except for the I_T
2993          *    nexus on which the PERSISTENT RESERVE OUT command was
2994          *    received, the device server shall establish a unit
2995          *    attention condition for the initiator port associated with
2996          *    that I_T nexus, with the additional sense code set to
2997          *    RESERVATIONS RELEASED. If the type or scope have not
2998          *    changed, then no unit attention condition(s) shall be
2999          *    established for this reason.
3000          */
3001         if ((prh_type != type) || (prh_scope != scope)) {
3002                 spin_lock(&pr_tmpl->registration_lock);
3003                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3004                                 &pr_tmpl->registration_list, pr_reg_list) {
3005
3006                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3007                         if (calling_it_nexus)
3008                                 continue;
3009
3010                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3011                                         pr_reg->pr_res_mapped_lun, 0x2A,
3012                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3013                 }
3014                 spin_unlock(&pr_tmpl->registration_lock);
3015         }
3016         spin_unlock(&dev->dev_reservation_lock);
3017         /*
3018          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3019          * All received CDBs for the matching existing reservation and
3020          * registrations undergo ABORT_TASK logic.
3021          *
3022          * From there, core_scsi3_release_preempt_and_abort() will
3023          * release every registration in the list (which have already
3024          * been removed from the primary pr_reg list), except the
3025          * new persistent reservation holder, the calling Initiator Port.
3026          */
3027         if (preempt_type == PREEMPT_AND_ABORT) {
3028                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3029                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3030                                                 pr_reg_n);
3031         }
3032
3033         if (pr_tmpl->pr_aptpl_active)
3034                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3035
3036         core_scsi3_put_pr_reg(pr_reg_n);
3037         core_scsi3_pr_generation(cmd->se_dev);
3038         return 0;
3039 }
3040
3041 static sense_reason_t
3042 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3043                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3044 {
3045         switch (type) {
3046         case PR_TYPE_WRITE_EXCLUSIVE:
3047         case PR_TYPE_EXCLUSIVE_ACCESS:
3048         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3049         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3050         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3051         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3052                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3053                                               sa_res_key, preempt_type);
3054         default:
3055                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3056                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3057                 return TCM_INVALID_CDB_FIELD;
3058         }
3059 }
3060
3061
3062 static sense_reason_t
3063 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3064                 u64 sa_res_key, int aptpl, int unreg)
3065 {
3066         struct se_session *se_sess = cmd->se_sess;
3067         struct se_device *dev = cmd->se_dev;
3068         struct se_dev_entry *dest_se_deve = NULL;
3069         struct se_lun *se_lun = cmd->se_lun;
3070         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3071         struct se_port *se_port;
3072         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3073         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3074         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3075         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3076         unsigned char *buf;
3077         unsigned char *initiator_str;
3078         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3079         u32 tid_len, tmp_tid_len;
3080         int new_reg = 0, type, scope, matching_iname;
3081         sense_reason_t ret;
3082         unsigned short rtpi;
3083         unsigned char proto_ident;
3084
3085         if (!se_sess || !se_lun) {
3086                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3087                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3088         }
3089
3090         memset(dest_iport, 0, 64);
3091         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3092         se_tpg = se_sess->se_tpg;
3093         tf_ops = se_tpg->se_tpg_tfo;
3094         /*
3095          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3096          *      Register behaviors for a REGISTER AND MOVE service action
3097          *
3098          * Locate the existing *pr_reg via struct se_node_acl pointers
3099          */
3100         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3101                                 se_sess);
3102         if (!pr_reg) {
3103                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3104                         " *pr_reg for REGISTER_AND_MOVE\n");
3105                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3106         }
3107         /*
3108          * The provided reservation key much match the existing reservation key
3109          * provided during this initiator's I_T nexus registration.
3110          */
3111         if (res_key != pr_reg->pr_res_key) {
3112                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3113                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3114                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3115                 ret = TCM_RESERVATION_CONFLICT;
3116                 goto out_put_pr_reg;
3117         }
3118         /*
3119          * The service active reservation key needs to be non zero
3120          */
3121         if (!sa_res_key) {
3122                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3123                         " sa_res_key\n");
3124                 ret = TCM_INVALID_PARAMETER_LIST;
3125                 goto out_put_pr_reg;
3126         }
3127
3128         /*
3129          * Determine the Relative Target Port Identifier where the reservation
3130          * will be moved to for the TransportID containing SCSI initiator WWN
3131          * information.
3132          */
3133         buf = transport_kmap_data_sg(cmd);
3134         if (!buf) {
3135                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3136                 goto out_put_pr_reg;
3137         }
3138
3139         rtpi = (buf[18] & 0xff) << 8;
3140         rtpi |= buf[19] & 0xff;
3141         tid_len = (buf[20] & 0xff) << 24;
3142         tid_len |= (buf[21] & 0xff) << 16;
3143         tid_len |= (buf[22] & 0xff) << 8;
3144         tid_len |= buf[23] & 0xff;
3145         transport_kunmap_data_sg(cmd);
3146         buf = NULL;
3147
3148         if ((tid_len + 24) != cmd->data_length) {
3149                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3150                         " does not equal CDB data_length: %u\n", tid_len,
3151                         cmd->data_length);
3152                 ret = TCM_INVALID_PARAMETER_LIST;
3153                 goto out_put_pr_reg;
3154         }
3155
3156         spin_lock(&dev->se_port_lock);
3157         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3158                 if (se_port->sep_rtpi != rtpi)
3159                         continue;
3160                 dest_se_tpg = se_port->sep_tpg;
3161                 if (!dest_se_tpg)
3162                         continue;
3163                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3164                 if (!dest_tf_ops)
3165                         continue;
3166
3167                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3168                 smp_mb__after_atomic_inc();
3169                 spin_unlock(&dev->se_port_lock);
3170
3171                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3172                         pr_err("core_scsi3_tpg_depend_item() failed"
3173                                 " for dest_se_tpg\n");
3174                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3175                         smp_mb__after_atomic_dec();
3176                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3177                         goto out_put_pr_reg;
3178                 }
3179
3180                 spin_lock(&dev->se_port_lock);
3181                 break;
3182         }
3183         spin_unlock(&dev->se_port_lock);
3184
3185         if (!dest_se_tpg || !dest_tf_ops) {
3186                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3187                         " fabric ops from Relative Target Port Identifier:"
3188                         " %hu\n", rtpi);
3189                 ret = TCM_INVALID_PARAMETER_LIST;
3190                 goto out_put_pr_reg;
3191         }
3192
3193         buf = transport_kmap_data_sg(cmd);
3194         if (!buf) {
3195                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3196                 goto out_put_pr_reg;
3197         }
3198         proto_ident = (buf[24] & 0x0f);
3199
3200         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3201                         " 0x%02x\n", proto_ident);
3202
3203         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3204                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3205                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3206                         " from fabric: %s\n", proto_ident,
3207                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3208                         dest_tf_ops->get_fabric_name());
3209                 ret = TCM_INVALID_PARAMETER_LIST;
3210                 goto out;
3211         }
3212         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3213                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3214                         " containg a valid tpg_parse_pr_out_transport_id"
3215                         " function pointer\n");
3216                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3217                 goto out;
3218         }
3219         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3220                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3221         if (!initiator_str) {
3222                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3223                         " initiator_str from Transport ID\n");
3224                 ret = TCM_INVALID_PARAMETER_LIST;
3225                 goto out;
3226         }
3227
3228         transport_kunmap_data_sg(cmd);
3229         buf = NULL;
3230
3231         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3232                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3233                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3234                 iport_ptr : "");
3235         /*
3236          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3237          * action specifies a TransportID that is the same as the initiator port
3238          * of the I_T nexus for the command received, then the command shall
3239          * be terminated with CHECK CONDITION status, with the sense key set to
3240          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3241          * IN PARAMETER LIST.
3242          */
3243         pr_reg_nacl = pr_reg->pr_reg_nacl;
3244         matching_iname = (!strcmp(initiator_str,
3245                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3246         if (!matching_iname)
3247                 goto after_iport_check;
3248
3249         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3250                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3251                         " matches: %s on received I_T Nexus\n", initiator_str,
3252                         pr_reg_nacl->initiatorname);
3253                 ret = TCM_INVALID_PARAMETER_LIST;
3254                 goto out;
3255         }
3256         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3257                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3258                         " matches: %s %s on received I_T Nexus\n",
3259                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3260                         pr_reg->pr_reg_isid);
3261                 ret = TCM_INVALID_PARAMETER_LIST;
3262                 goto out;
3263         }
3264 after_iport_check:
3265         /*
3266          * Locate the destination struct se_node_acl from the received Transport ID
3267          */
3268         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3269         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3270                                 initiator_str);
3271         if (dest_node_acl) {
3272                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3273                 smp_mb__after_atomic_inc();
3274         }
3275         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3276
3277         if (!dest_node_acl) {
3278                 pr_err("Unable to locate %s dest_node_acl for"
3279                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3280                         initiator_str);
3281                 ret = TCM_INVALID_PARAMETER_LIST;
3282                 goto out;
3283         }
3284
3285         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3286                 pr_err("core_scsi3_nodeacl_depend_item() for"
3287                         " dest_node_acl\n");
3288                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3289                 smp_mb__after_atomic_dec();
3290                 dest_node_acl = NULL;
3291                 ret = TCM_INVALID_PARAMETER_LIST;
3292                 goto out;
3293         }
3294
3295         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3296                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3297                 dest_node_acl->initiatorname);
3298
3299         /*
3300          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3301          * PORT IDENTIFIER.
3302          */
3303         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3304         if (!dest_se_deve) {
3305                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3306                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3307                 ret = TCM_INVALID_PARAMETER_LIST;
3308                 goto out;
3309         }
3310
3311         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3312                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3313                 atomic_dec(&dest_se_deve->pr_ref_count);
3314                 smp_mb__after_atomic_dec();
3315                 dest_se_deve = NULL;
3316                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3317                 goto out;
3318         }
3319
3320         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3321                 " ACL for dest_se_deve->mapped_lun: %u\n",
3322                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3323                 dest_se_deve->mapped_lun);
3324
3325         /*
3326          * A persistent reservation needs to already existing in order to
3327          * successfully complete the REGISTER_AND_MOVE service action..
3328          */
3329         spin_lock(&dev->dev_reservation_lock);
3330         pr_res_holder = dev->dev_pr_res_holder;
3331         if (!pr_res_holder) {
3332                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3333                         " currently held\n");
3334                 spin_unlock(&dev->dev_reservation_lock);
3335                 ret = TCM_INVALID_CDB_FIELD;
3336                 goto out;
3337         }
3338         /*
3339          * The received on I_T Nexus must be the reservation holder.
3340          *
3341          * From spc4r17 section 5.7.8  Table 50 --
3342          *      Register behaviors for a REGISTER AND MOVE service action
3343          */
3344         if (pr_res_holder != pr_reg) {
3345                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3346                         " Nexus is not reservation holder\n");
3347                 spin_unlock(&dev->dev_reservation_lock);
3348                 ret = TCM_RESERVATION_CONFLICT;
3349                 goto out;
3350         }
3351         /*
3352          * From spc4r17 section 5.7.8: registering and moving reservation
3353          *
3354          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3355          * action is received and the established persistent reservation is a
3356          * Write Exclusive - All Registrants type or Exclusive Access -
3357          * All Registrants type reservation, then the command shall be completed
3358          * with RESERVATION CONFLICT status.
3359          */
3360         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3361             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3362                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3363                         " reservation for type: %s\n",
3364                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3365                 spin_unlock(&dev->dev_reservation_lock);
3366                 ret = TCM_RESERVATION_CONFLICT;
3367                 goto out;
3368         }
3369         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3370         /*
3371          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3372          */
3373         type = pr_res_holder->pr_res_type;
3374         scope = pr_res_holder->pr_res_type;
3375         /*
3376          * c) Associate the reservation key specified in the SERVICE ACTION
3377          *    RESERVATION KEY field with the I_T nexus specified as the
3378          *    destination of the register and move, where:
3379          *    A) The I_T nexus is specified by the TransportID and the
3380          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3381          *    B) Regardless of the TransportID format used, the association for
3382          *       the initiator port is based on either the initiator port name
3383          *       (see 3.1.71) on SCSI transport protocols where port names are
3384          *       required or the initiator port identifier (see 3.1.70) on SCSI
3385          *       transport protocols where port names are not required;
3386          * d) Register the reservation key specified in the SERVICE ACTION
3387          *    RESERVATION KEY field;
3388          * e) Retain the reservation key specified in the SERVICE ACTION
3389          *    RESERVATION KEY field and associated information;
3390          *
3391          * Also, It is not an error for a REGISTER AND MOVE service action to
3392          * register an I_T nexus that is already registered with the same
3393          * reservation key or a different reservation key.
3394          */
3395         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3396                                         iport_ptr);
3397         if (!dest_pr_reg) {
3398                 if (core_scsi3_alloc_registration(cmd->se_dev,
3399                                 dest_node_acl, dest_se_deve, iport_ptr,
3400                                 sa_res_key, 0, aptpl, 2, 1)) {
3401                         spin_unlock(&dev->dev_reservation_lock);
3402                         ret = TCM_INVALID_PARAMETER_LIST;
3403                         goto out;
3404                 }
3405                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3406                                                 iport_ptr);
3407                 new_reg = 1;
3408         }
3409         /*
3410          * f) Release the persistent reservation for the persistent reservation
3411          *    holder (i.e., the I_T nexus on which the
3412          */
3413         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3414                         dev->dev_pr_res_holder, 0);
3415         /*
3416          * g) Move the persistent reservation to the specified I_T nexus using
3417          *    the same scope and type as the persistent reservation released in
3418          *    item f); and
3419          */
3420         dev->dev_pr_res_holder = dest_pr_reg;
3421         dest_pr_reg->pr_res_holder = 1;
3422         dest_pr_reg->pr_res_type = type;
3423         pr_reg->pr_res_scope = scope;
3424         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3425         /*
3426          * Increment PRGeneration for existing registrations..
3427          */
3428         if (!new_reg)
3429                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3430         spin_unlock(&dev->dev_reservation_lock);
3431
3432         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3433                 " created new reservation holder TYPE: %s on object RTPI:"
3434                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3435                 core_scsi3_pr_dump_type(type), rtpi,
3436                 dest_pr_reg->pr_res_generation);
3437         pr_debug("SPC-3 PR Successfully moved reservation from"
3438                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3439                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3440                 i_buf, dest_tf_ops->get_fabric_name(),
3441                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3442                 iport_ptr : "");
3443         /*
3444          * It is now safe to release configfs group dependencies for destination
3445          * of Transport ID Initiator Device/Port Identifier
3446          */
3447         core_scsi3_lunacl_undepend_item(dest_se_deve);
3448         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3449         core_scsi3_tpg_undepend_item(dest_se_tpg);
3450         /*
3451          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3452          * nexus on which PERSISTENT RESERVE OUT command was received.
3453          */
3454         if (unreg) {
3455                 spin_lock(&pr_tmpl->registration_lock);
3456                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3457                 spin_unlock(&pr_tmpl->registration_lock);
3458         } else
3459                 core_scsi3_put_pr_reg(pr_reg);
3460
3461         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3462
3463         transport_kunmap_data_sg(cmd);
3464
3465         core_scsi3_put_pr_reg(dest_pr_reg);
3466         return 0;
3467 out:
3468         if (buf)
3469                 transport_kunmap_data_sg(cmd);
3470         if (dest_se_deve)
3471                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3472         if (dest_node_acl)
3473                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3474         core_scsi3_tpg_undepend_item(dest_se_tpg);
3475
3476 out_put_pr_reg:
3477         core_scsi3_put_pr_reg(pr_reg);
3478         return ret;
3479 }
3480
3481 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3482 {
3483         unsigned int __v1, __v2;
3484
3485         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3486         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3487
3488         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3489 }
3490
3491 /*
3492  * See spc4r17 section 6.14 Table 170
3493  */
3494 sense_reason_t
3495 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3496 {
3497         unsigned char *cdb = &cmd->t_task_cdb[0];
3498         unsigned char *buf;
3499         u64 res_key, sa_res_key;
3500         int sa, scope, type, aptpl;
3501         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3502         sense_reason_t ret;
3503
3504         /*
3505          * Following spc2r20 5.5.1 Reservations overview:
3506          *
3507          * If a logical unit has been reserved by any RESERVE command and is
3508          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3509          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3510          * initiator or service action and shall terminate with a RESERVATION
3511          * CONFLICT status.
3512          */
3513         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3514                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3515                         " SPC-2 reservation is held, returning"
3516                         " RESERVATION_CONFLICT\n");
3517                 return TCM_RESERVATION_CONFLICT;
3518         }
3519
3520         /*
3521          * FIXME: A NULL struct se_session pointer means an this is not coming from
3522          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3523          */
3524         if (!cmd->se_sess)
3525                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3526
3527         if (cmd->data_length < 24) {
3528                 pr_warn("SPC-PR: Received PR OUT parameter list"
3529                         " length too small: %u\n", cmd->data_length);
3530                 return TCM_INVALID_PARAMETER_LIST;
3531         }
3532
3533         /*
3534          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3535          */
3536         sa = (cdb[1] & 0x1f);
3537         scope = (cdb[2] & 0xf0);
3538         type = (cdb[2] & 0x0f);
3539
3540         buf = transport_kmap_data_sg(cmd);
3541         if (!buf)
3542                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3543
3544         /*
3545          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3546          */
3547         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3548         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3549         /*
3550          * REGISTER_AND_MOVE uses a different SA parameter list containing
3551          * SCSI TransportIDs.
3552          */
3553         if (sa != PRO_REGISTER_AND_MOVE) {
3554                 spec_i_pt = (buf[20] & 0x08);
3555                 all_tg_pt = (buf[20] & 0x04);
3556                 aptpl = (buf[20] & 0x01);
3557         } else {
3558                 aptpl = (buf[17] & 0x01);
3559                 unreg = (buf[17] & 0x02);
3560         }
3561         transport_kunmap_data_sg(cmd);
3562         buf = NULL;
3563
3564         /*
3565          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3566          */
3567         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3568                 return TCM_INVALID_PARAMETER_LIST;
3569
3570         /*
3571          * From spc4r17 section 6.14:
3572          *
3573          * If the SPEC_I_PT bit is set to zero, the service action is not
3574          * REGISTER AND MOVE, and the parameter list length is not 24, then
3575          * the command shall be terminated with CHECK CONDITION status, with
3576          * the sense key set to ILLEGAL REQUEST, and the additional sense
3577          * code set to PARAMETER LIST LENGTH ERROR.
3578          */
3579         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3580             (cmd->data_length != 24)) {
3581                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3582                         " list length: %u\n", cmd->data_length);
3583                 return TCM_INVALID_PARAMETER_LIST;
3584         }
3585
3586         /*
3587          * (core_scsi3_emulate_pro_* function parameters
3588          * are defined by spc4r17 Table 174:
3589          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3590          */
3591         switch (sa) {
3592         case PRO_REGISTER:
3593                 ret = core_scsi3_emulate_pro_register(cmd,
3594                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3595                 break;
3596         case PRO_RESERVE:
3597                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3598                 break;
3599         case PRO_RELEASE:
3600                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3601                 break;
3602         case PRO_CLEAR:
3603                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3604                 break;
3605         case PRO_PREEMPT:
3606                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3607                                         res_key, sa_res_key, PREEMPT);
3608                 break;
3609         case PRO_PREEMPT_AND_ABORT:
3610                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3611                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3612                 break;
3613         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3614                 ret = core_scsi3_emulate_pro_register(cmd,
3615                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3616                 break;
3617         case PRO_REGISTER_AND_MOVE:
3618                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3619                                 sa_res_key, aptpl, unreg);
3620                 break;
3621         default:
3622                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3623                         " action: 0x%02x\n", cdb[1] & 0x1f);
3624                 return TCM_INVALID_CDB_FIELD;
3625         }
3626
3627         if (!ret)
3628                 target_complete_cmd(cmd, GOOD);
3629         return ret;
3630 }
3631
3632 /*
3633  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3634  *
3635  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3636  */
3637 static sense_reason_t
3638 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3639 {
3640         struct se_device *dev = cmd->se_dev;
3641         struct t10_pr_registration *pr_reg;
3642         unsigned char *buf;
3643         u32 add_len = 0, off = 8;
3644
3645         if (cmd->data_length < 8) {
3646                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3647                         " too small\n", cmd->data_length);
3648                 return TCM_INVALID_CDB_FIELD;
3649         }
3650
3651         buf = transport_kmap_data_sg(cmd);
3652         if (!buf)
3653                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3654
3655         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3656         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3657         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3658         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3659
3660         spin_lock(&dev->t10_pr.registration_lock);
3661         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3662                         pr_reg_list) {
3663                 /*
3664                  * Check for overflow of 8byte PRI READ_KEYS payload and
3665                  * next reservation key list descriptor.
3666                  */
3667                 if ((add_len + 8) > (cmd->data_length - 8))
3668                         break;
3669
3670                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3671                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3672                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3673                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3674                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3675                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3676                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3677                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3678
3679                 add_len += 8;
3680         }
3681         spin_unlock(&dev->t10_pr.registration_lock);
3682
3683         buf[4] = ((add_len >> 24) & 0xff);
3684         buf[5] = ((add_len >> 16) & 0xff);
3685         buf[6] = ((add_len >> 8) & 0xff);
3686         buf[7] = (add_len & 0xff);
3687
3688         transport_kunmap_data_sg(cmd);
3689
3690         return 0;
3691 }
3692
3693 /*
3694  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3695  *
3696  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3697  */
3698 static sense_reason_t
3699 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3700 {
3701         struct se_device *dev = cmd->se_dev;
3702         struct t10_pr_registration *pr_reg;
3703         unsigned char *buf;
3704         u64 pr_res_key;
3705         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3706
3707         if (cmd->data_length < 8) {
3708                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3709                         " too small\n", cmd->data_length);
3710                 return TCM_INVALID_CDB_FIELD;
3711         }
3712
3713         buf = transport_kmap_data_sg(cmd);
3714         if (!buf)
3715                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3716
3717         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3718         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3719         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3720         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3721
3722         spin_lock(&dev->dev_reservation_lock);
3723         pr_reg = dev->dev_pr_res_holder;
3724         if (pr_reg) {
3725                 /*
3726                  * Set the hardcoded Additional Length
3727                  */
3728                 buf[4] = ((add_len >> 24) & 0xff);
3729                 buf[5] = ((add_len >> 16) & 0xff);
3730                 buf[6] = ((add_len >> 8) & 0xff);
3731                 buf[7] = (add_len & 0xff);
3732
3733                 if (cmd->data_length < 22)
3734                         goto err;
3735
3736                 /*
3737                  * Set the Reservation key.
3738                  *
3739                  * From spc4r17, section 5.7.10:
3740                  * A persistent reservation holder has its reservation key
3741                  * returned in the parameter data from a PERSISTENT
3742                  * RESERVE IN command with READ RESERVATION service action as
3743                  * follows:
3744                  * a) For a persistent reservation of the type Write Exclusive
3745                  *    - All Registrants or Exclusive Access  All Regitrants,
3746                  *      the reservation key shall be set to zero; or
3747                  * b) For all other persistent reservation types, the
3748                  *    reservation key shall be set to the registered
3749                  *    reservation key for the I_T nexus that holds the
3750                  *    persistent reservation.
3751                  */
3752                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3753                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3754                         pr_res_key = 0;
3755                 else
3756                         pr_res_key = pr_reg->pr_res_key;
3757
3758                 buf[8] = ((pr_res_key >> 56) & 0xff);
3759                 buf[9] = ((pr_res_key >> 48) & 0xff);
3760                 buf[10] = ((pr_res_key >> 40) & 0xff);
3761                 buf[11] = ((pr_res_key >> 32) & 0xff);
3762                 buf[12] = ((pr_res_key >> 24) & 0xff);
3763                 buf[13] = ((pr_res_key >> 16) & 0xff);
3764                 buf[14] = ((pr_res_key >> 8) & 0xff);
3765                 buf[15] = (pr_res_key & 0xff);
3766                 /*
3767                  * Set the SCOPE and TYPE
3768                  */
3769                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3770                           (pr_reg->pr_res_type & 0x0f);
3771         }
3772
3773 err:
3774         spin_unlock(&dev->dev_reservation_lock);
3775         transport_kunmap_data_sg(cmd);
3776
3777         return 0;
3778 }
3779
3780 /*
3781  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3782  *
3783  * See spc4r17 section 6.13.4 Table 165
3784  */
3785 static sense_reason_t
3786 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3787 {
3788         struct se_device *dev = cmd->se_dev;
3789         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3790         unsigned char *buf;
3791         u16 add_len = 8; /* Hardcoded to 8. */
3792
3793         if (cmd->data_length < 6) {
3794                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3795                         " %u too small\n", cmd->data_length);
3796                 return TCM_INVALID_CDB_FIELD;
3797         }
3798
3799         buf = transport_kmap_data_sg(cmd);
3800         if (!buf)
3801                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3802
3803         buf[0] = ((add_len << 8) & 0xff);
3804         buf[1] = (add_len & 0xff);
3805         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3806         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3807         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3808         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3809         /*
3810          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3811          * set the TMV: Task Mask Valid bit.
3812          */
3813         buf[3] |= 0x80;
3814         /*
3815          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3816          */
3817         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3818         /*
3819          * PTPL_A: Persistence across Target Power Loss Active bit
3820          */
3821         if (pr_tmpl->pr_aptpl_active)
3822                 buf[3] |= 0x01;
3823         /*
3824          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3825          */
3826         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3827         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3828         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3829         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3830         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3831         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3832
3833         transport_kunmap_data_sg(cmd);
3834
3835         return 0;
3836 }
3837
3838 /*
3839  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3840  *
3841  * See spc4r17 section 6.13.5 Table 168 and 169
3842  */
3843 static sense_reason_t
3844 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3845 {
3846         struct se_device *dev = cmd->se_dev;
3847         struct se_node_acl *se_nacl;
3848         struct se_portal_group *se_tpg;
3849         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3850         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3851         unsigned char *buf;
3852         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3853         u32 off = 8; /* off into first Full Status descriptor */
3854         int format_code = 0;
3855
3856         if (cmd->data_length < 8) {
3857                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3858                         " too small\n", cmd->data_length);
3859                 return TCM_INVALID_CDB_FIELD;
3860         }
3861
3862         buf = transport_kmap_data_sg(cmd);
3863         if (!buf)
3864                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3865
3866         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3867         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3868         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3869         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3870
3871         spin_lock(&pr_tmpl->registration_lock);
3872         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3873                         &pr_tmpl->registration_list, pr_reg_list) {
3874
3875                 se_nacl = pr_reg->pr_reg_nacl;
3876                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3877                 add_desc_len = 0;
3878
3879                 atomic_inc(&pr_reg->pr_res_holders);
3880                 smp_mb__after_atomic_inc();
3881                 spin_unlock(&pr_tmpl->registration_lock);
3882                 /*
3883                  * Determine expected length of $FABRIC_MOD specific
3884                  * TransportID full status descriptor..
3885                  */
3886                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
3887                                 se_tpg, se_nacl, pr_reg, &format_code);
3888
3889                 if ((exp_desc_len + add_len) > cmd->data_length) {
3890                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3891                                 " out of buffer: %d\n", cmd->data_length);
3892                         spin_lock(&pr_tmpl->registration_lock);
3893                         atomic_dec(&pr_reg->pr_res_holders);
3894                         smp_mb__after_atomic_dec();
3895                         break;
3896                 }
3897                 /*
3898                  * Set RESERVATION KEY
3899                  */
3900                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3901                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3902                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3903                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3904                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3905                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3906                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3907                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3908                 off += 4; /* Skip Over Reserved area */
3909
3910                 /*
3911                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3912                  */
3913                 if (pr_reg->pr_reg_all_tg_pt)
3914                         buf[off] = 0x02;
3915                 /*
3916                  * The struct se_lun pointer will be present for the
3917                  * reservation holder for PR_HOLDER bit.
3918                  *
3919                  * Also, if this registration is the reservation
3920                  * holder, fill in SCOPE and TYPE in the next byte.
3921                  */
3922                 if (pr_reg->pr_res_holder) {
3923                         buf[off++] |= 0x01;
3924                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3925                                      (pr_reg->pr_res_type & 0x0f);
3926                 } else
3927                         off += 2;
3928
3929                 off += 4; /* Skip over reserved area */
3930                 /*
3931                  * From spc4r17 6.3.15:
3932                  *
3933                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3934                  * IDENTIFIER field contains the relative port identifier (see
3935                  * 3.1.120) of the target port that is part of the I_T nexus
3936                  * described by this full status descriptor. If the ALL_TG_PT
3937                  * bit is set to one, the contents of the RELATIVE TARGET PORT
3938                  * IDENTIFIER field are not defined by this standard.
3939                  */
3940                 if (!pr_reg->pr_reg_all_tg_pt) {
3941                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
3942
3943                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
3944                         buf[off++] = (port->sep_rtpi & 0xff);
3945                 } else
3946                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
3947
3948                 /*
3949                  * Now, have the $FABRIC_MOD fill in the protocol identifier
3950                  */
3951                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
3952                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
3953
3954                 spin_lock(&pr_tmpl->registration_lock);
3955                 atomic_dec(&pr_reg->pr_res_holders);
3956                 smp_mb__after_atomic_dec();
3957                 /*
3958                  * Set the ADDITIONAL DESCRIPTOR LENGTH
3959                  */
3960                 buf[off++] = ((desc_len >> 24) & 0xff);
3961                 buf[off++] = ((desc_len >> 16) & 0xff);
3962                 buf[off++] = ((desc_len >> 8) & 0xff);
3963                 buf[off++] = (desc_len & 0xff);
3964                 /*
3965                  * Size of full desctipor header minus TransportID
3966                  * containing $FABRIC_MOD specific) initiator device/port
3967                  * WWN information.
3968                  *
3969                  *  See spc4r17 Section 6.13.5 Table 169
3970                  */
3971                 add_desc_len = (24 + desc_len);
3972
3973                 off += desc_len;
3974                 add_len += add_desc_len;
3975         }
3976         spin_unlock(&pr_tmpl->registration_lock);
3977         /*
3978          * Set ADDITIONAL_LENGTH
3979          */
3980         buf[4] = ((add_len >> 24) & 0xff);
3981         buf[5] = ((add_len >> 16) & 0xff);
3982         buf[6] = ((add_len >> 8) & 0xff);
3983         buf[7] = (add_len & 0xff);
3984
3985         transport_kunmap_data_sg(cmd);
3986
3987         return 0;
3988 }
3989
3990 sense_reason_t
3991 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
3992 {
3993         sense_reason_t ret;
3994
3995         /*
3996          * Following spc2r20 5.5.1 Reservations overview:
3997          *
3998          * If a logical unit has been reserved by any RESERVE command and is
3999          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4000          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4001          * initiator or service action and shall terminate with a RESERVATION
4002          * CONFLICT status.
4003          */
4004         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4005                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4006                         " SPC-2 reservation is held, returning"
4007                         " RESERVATION_CONFLICT\n");
4008                 return TCM_RESERVATION_CONFLICT;
4009         }
4010
4011         switch (cmd->t_task_cdb[1] & 0x1f) {
4012         case PRI_READ_KEYS:
4013                 ret = core_scsi3_pri_read_keys(cmd);
4014                 break;
4015         case PRI_READ_RESERVATION:
4016                 ret = core_scsi3_pri_read_reservation(cmd);
4017                 break;
4018         case PRI_REPORT_CAPABILITIES:
4019                 ret = core_scsi3_pri_report_capabilities(cmd);
4020                 break;
4021         case PRI_READ_FULL_STATUS:
4022                 ret = core_scsi3_pri_read_full_status(cmd);
4023                 break;
4024         default:
4025                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4026                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4027                 return TCM_INVALID_CDB_FIELD;
4028         }
4029
4030         if (!ret)
4031                 target_complete_cmd(cmd, GOOD);
4032         return ret;
4033 }
4034
4035 sense_reason_t
4036 target_check_reservation(struct se_cmd *cmd)
4037 {
4038         struct se_device *dev = cmd->se_dev;
4039         sense_reason_t ret;
4040
4041         if (!cmd->se_sess)
4042                 return 0;
4043         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4044                 return 0;
4045         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4046                 return 0;
4047
4048         spin_lock(&dev->dev_reservation_lock);
4049         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4050                 ret = target_scsi2_reservation_check(cmd);
4051         else
4052                 ret = target_scsi3_pr_reservation_check(cmd);
4053         spin_unlock(&dev->dev_reservation_lock);
4054
4055         return ret;
4056 }