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/vmalloc.h>
  31 #include <linux/file.h>
  32 #include <scsi/scsi_proto.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
  39 #include "target_core_internal.h"
  40 #include "target_core_pr.h"
  41 #include "target_core_ua.h"
  42
  43 /*
  44  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  45  */
  46 struct pr_transport_id_holder {
  47         struct t10_pr_registration *dest_pr_reg;
  48         struct se_portal_group *dest_tpg;
  49         struct se_node_acl *dest_node_acl;
  50         struct se_dev_entry *dest_se_deve;
  51         struct list_head dest_list;
  52 };
  53
  54 void core_pr_dump_initiator_port(
  55         struct t10_pr_registration *pr_reg,
  56         char *buf,
  57         u32 size)
  58 {
  59         if (!pr_reg->isid_present_at_reg) {
  60                 buf[0] = '\0';
  61                 return;
  62         }
  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, int);
  80
  81 static int is_reservation_holder(
  82         struct t10_pr_registration *pr_res_holder,
  83         struct t10_pr_registration *pr_reg)
  84 {
  85         int pr_res_type;
  86
  87         if (pr_res_holder) {
  88                 pr_res_type = pr_res_holder->pr_res_type;
  89
  90                 return pr_res_holder == pr_reg ||
  91                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  92                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  93         }
  94         return 0;
  95 }
  96
  97 static sense_reason_t
  98 target_scsi2_reservation_check(struct se_cmd *cmd)
  99 {
 100         struct se_device *dev = cmd->se_dev;
 101         struct se_session *sess = cmd->se_sess;
 102
 103         switch (cmd->t_task_cdb[0]) {
 104         case INQUIRY:
 105         case RELEASE:
 106         case RELEASE_10:
 107                 return 0;
 108         default:
 109                 break;
 110         }
 111
 112         if (!dev->dev_reserved_node_acl || !sess)
 113                 return 0;
 114
 115         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 116                 return TCM_RESERVATION_CONFLICT;
 117
 118         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 119                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 120                         return TCM_RESERVATION_CONFLICT;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 127                                         struct se_node_acl *, struct se_session *);
 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 129
 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 131 {
 132         struct se_session *se_sess = cmd->se_sess;
 133         struct se_device *dev = cmd->se_dev;
 134         struct t10_pr_registration *pr_reg;
 135         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 136         int conflict = 0;
 137
 138         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 139                         se_sess);
 140         if (pr_reg) {
 141                 /*
 142                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 143                  * behavior
 144                  *
 145                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 146                  * status, but no reservation shall be established and the
 147                  * persistent reservation shall not be changed, if the command
 148                  * is received from a) and b) below.
 149                  *
 150                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 151                  * status, but the persistent reservation shall not be released,
 152                  * if the command is received from a) and b)
 153                  *
 154                  * a) An I_T nexus that is a persistent reservation holder; or
 155                  * b) An I_T nexus that is registered if a registrants only or
 156                  *    all registrants type persistent reservation is present.
 157                  *
 158                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 159                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 160                  * as defined in SPC-2.
 161                  */
 162                 if (pr_reg->pr_res_holder) {
 163                         core_scsi3_put_pr_reg(pr_reg);
 164                         return 1;
 165                 }
 166                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 168                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 169                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 170                         core_scsi3_put_pr_reg(pr_reg);
 171                         return 1;
 172                 }
 173                 core_scsi3_put_pr_reg(pr_reg);
 174                 conflict = 1;
 175         } else {
 176                 /*
 177                  * Following spc2r20 5.5.1 Reservations overview:
 178                  *
 179                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 180                  * command with the REGISTER or the REGISTER AND IGNORE
 181                  * EXISTING KEY service action and is still registered by any
 182                  * initiator, all RESERVE commands and all RELEASE commands
 183                  * regardless of initiator shall conflict and shall terminate
 184                  * with a RESERVATION CONFLICT status.
 185                  */
 186                 spin_lock(&pr_tmpl->registration_lock);
 187                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 188                 spin_unlock(&pr_tmpl->registration_lock);
 189         }
 190
 191         if (conflict) {
 192                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 193                         " while active SPC-3 registrations exist,"
 194                         " returning RESERVATION_CONFLICT\n");
 195                 return -EBUSY;
 196         }
 197
 198         return 0;
 199 }
 200
 201 sense_reason_t
 202 target_scsi2_reservation_release(struct se_cmd *cmd)
 203 {
 204         struct se_device *dev = cmd->se_dev;
 205         struct se_session *sess = cmd->se_sess;
 206         struct se_portal_group *tpg;
 207         int rc;
 208
 209         if (!sess || !sess->se_tpg)
 210                 goto out;
 211         rc = target_check_scsi2_reservation_conflict(cmd);
 212         if (rc == 1)
 213                 goto out;
 214         if (rc < 0)
 215                 return TCM_RESERVATION_CONFLICT;
 216
 217         spin_lock(&dev->dev_reservation_lock);
 218         if (!dev->dev_reserved_node_acl || !sess)
 219                 goto out_unlock;
 220
 221         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 222                 goto out_unlock;
 223
 224         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 225                 goto out_unlock;
 226
 227         dev->dev_reserved_node_acl = NULL;
 228         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 229         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 230                 dev->dev_res_bin_isid = 0;
 231                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 232         }
 233         tpg = sess->se_tpg;
 234         pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
 235                 " MAPPED LUN: %llu for %s\n",
 236                 tpg->se_tpg_tfo->get_fabric_name(),
 237                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 238                 sess->se_node_acl->initiatorname);
 239
 240 out_unlock:
 241         spin_unlock(&dev->dev_reservation_lock);
 242 out:
 243         target_complete_cmd(cmd, GOOD);
 244         return 0;
 245 }
 246
 247 sense_reason_t
 248 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 249 {
 250         struct se_device *dev = cmd->se_dev;
 251         struct se_session *sess = cmd->se_sess;
 252         struct se_portal_group *tpg;
 253         sense_reason_t ret = 0;
 254         int rc;
 255
 256         if ((cmd->t_task_cdb[1] & 0x01) &&
 257             (cmd->t_task_cdb[1] & 0x02)) {
 258                 pr_err("LongIO and Obselete Bits set, returning"
 259                                 " ILLEGAL_REQUEST\n");
 260                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 261         }
 262         /*
 263          * This is currently the case for target_core_mod passthrough struct se_cmd
 264          * ops
 265          */
 266         if (!sess || !sess->se_tpg)
 267                 goto out;
 268         rc = target_check_scsi2_reservation_conflict(cmd);
 269         if (rc == 1)
 270                 goto out;
 271
 272         if (rc < 0)
 273                 return TCM_RESERVATION_CONFLICT;
 274
 275         tpg = sess->se_tpg;
 276         spin_lock(&dev->dev_reservation_lock);
 277         if (dev->dev_reserved_node_acl &&
 278            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 279                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 280                         tpg->se_tpg_tfo->get_fabric_name());
 281                 pr_err("Original reserver LUN: %llu %s\n",
 282                         cmd->se_lun->unpacked_lun,
 283                         dev->dev_reserved_node_acl->initiatorname);
 284                 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
 285                         " from %s \n", cmd->se_lun->unpacked_lun,
 286                         cmd->orig_fe_lun,
 287                         sess->se_node_acl->initiatorname);
 288                 ret = TCM_RESERVATION_CONFLICT;
 289                 goto out_unlock;
 290         }
 291
 292         dev->dev_reserved_node_acl = sess->se_node_acl;
 293         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 294         if (sess->sess_bin_isid != 0) {
 295                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 296                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 297         }
 298         pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
 299                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 300                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 301                 sess->se_node_acl->initiatorname);
 302
 303 out_unlock:
 304         spin_unlock(&dev->dev_reservation_lock);
 305 out:
 306         if (!ret)
 307                 target_complete_cmd(cmd, GOOD);
 308         return ret;
 309 }
 310
 311
 312 /*
 313  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 314  *
 315  * This function is called by those initiator ports who are *NOT*
 316  * the active PR reservation holder when a reservation is present.
 317  */
 318 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 319                                         bool isid_mismatch)
 320 {
 321         unsigned char *cdb = cmd->t_task_cdb;
 322         struct se_session *se_sess = cmd->se_sess;
 323         struct se_node_acl *nacl = se_sess->se_node_acl;
 324         int other_cdb = 0;
 325         int registered_nexus = 0, ret = 1; /* Conflict by default */
 326         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 327         int we = 0; /* Write Exclusive */
 328         int legacy = 0; /* Act like a legacy device and return
 329                          * RESERVATION CONFLICT on some CDBs */
 330
 331         if (isid_mismatch) {
 332                 registered_nexus = 0;
 333         } else {
 334                 struct se_dev_entry *se_deve;
 335
 336                 rcu_read_lock();
 337                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 338                 if (se_deve)
 339                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 340                                                     &se_deve->deve_flags);
 341                 rcu_read_unlock();
 342         }
 343
 344         switch (pr_reg_type) {
 345         case PR_TYPE_WRITE_EXCLUSIVE:
 346                 we = 1;
 347         case PR_TYPE_EXCLUSIVE_ACCESS:
 348                 /*
 349                  * Some commands are only allowed for the persistent reservation
 350                  * holder.
 351                  */
 352                 break;
 353         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 354                 we = 1;
 355         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 356                 /*
 357                  * Some commands are only allowed for registered I_T Nexuses.
 358                  */
 359                 reg_only = 1;
 360                 break;
 361         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 362                 we = 1;
 363         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 364                 /*
 365                  * Each registered I_T Nexus is a reservation holder.
 366                  */
 367                 all_reg = 1;
 368                 break;
 369         default:
 370                 return -EINVAL;
 371         }
 372         /*
 373          * Referenced from spc4r17 table 45 for *NON* PR holder access
 374          */
 375         switch (cdb[0]) {
 376         case SECURITY_PROTOCOL_IN:
 377                 if (registered_nexus)
 378                         return 0;
 379                 ret = (we) ? 0 : 1;
 380                 break;
 381         case MODE_SENSE:
 382         case MODE_SENSE_10:
 383         case READ_ATTRIBUTE:
 384         case READ_BUFFER:
 385         case RECEIVE_DIAGNOSTIC:
 386                 if (legacy) {
 387                         ret = 1;
 388                         break;
 389                 }
 390                 if (registered_nexus) {
 391                         ret = 0;
 392                         break;
 393                 }
 394                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 395                 break;
 396         case PERSISTENT_RESERVE_OUT:
 397                 /*
 398                  * This follows PERSISTENT_RESERVE_OUT service actions that
 399                  * are allowed in the presence of various reservations.
 400                  * See spc4r17, table 46
 401                  */
 402                 switch (cdb[1] & 0x1f) {
 403                 case PRO_CLEAR:
 404                 case PRO_PREEMPT:
 405                 case PRO_PREEMPT_AND_ABORT:
 406                         ret = (registered_nexus) ? 0 : 1;
 407                         break;
 408                 case PRO_REGISTER:
 409                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 410                         ret = 0;
 411                         break;
 412                 case PRO_REGISTER_AND_MOVE:
 413                 case PRO_RESERVE:
 414                         ret = 1;
 415                         break;
 416                 case PRO_RELEASE:
 417                         ret = (registered_nexus) ? 0 : 1;
 418                         break;
 419                 default:
 420                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 421                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 422                         return -EINVAL;
 423                 }
 424                 break;
 425         case RELEASE:
 426         case RELEASE_10:
 427                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 428                 ret = 0;
 429                 break;
 430         case RESERVE:
 431         case RESERVE_10:
 432                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 433                 ret = 0;
 434                 break;
 435         case TEST_UNIT_READY:
 436                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 437                 break;
 438         case MAINTENANCE_IN:
 439                 switch (cdb[1] & 0x1f) {
 440                 case MI_MANAGEMENT_PROTOCOL_IN:
 441                         if (registered_nexus) {
 442                                 ret = 0;
 443                                 break;
 444                         }
 445                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 446                         break;
 447                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 448                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 449                         if (legacy) {
 450                                 ret = 1;
 451                                 break;
 452                         }
 453                         if (registered_nexus) {
 454                                 ret = 0;
 455                                 break;
 456                         }
 457                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 458                         break;
 459                 case MI_REPORT_ALIASES:
 460                 case MI_REPORT_IDENTIFYING_INFORMATION:
 461                 case MI_REPORT_PRIORITY:
 462                 case MI_REPORT_TARGET_PGS:
 463                 case MI_REPORT_TIMESTAMP:
 464                         ret = 0; /* Allowed */
 465                         break;
 466                 default:
 467                         pr_err("Unknown MI Service Action: 0x%02x\n",
 468                                 (cdb[1] & 0x1f));
 469                         return -EINVAL;
 470                 }
 471                 break;
 472         case ACCESS_CONTROL_IN:
 473         case ACCESS_CONTROL_OUT:
 474         case INQUIRY:
 475         case LOG_SENSE:
 476         case SERVICE_ACTION_IN_12:
 477         case REPORT_LUNS:
 478         case REQUEST_SENSE:
 479         case PERSISTENT_RESERVE_IN:
 480                 ret = 0; /*/ Allowed CDBs */
 481                 break;
 482         default:
 483                 other_cdb = 1;
 484                 break;
 485         }
 486         /*
 487          * Case where the CDB is explicitly allowed in the above switch
 488          * statement.
 489          */
 490         if (!ret && !other_cdb) {
 491                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 492                         " reservation holder\n", cdb[0],
 493                         core_scsi3_pr_dump_type(pr_reg_type));
 494
 495                 return ret;
 496         }
 497         /*
 498          * Check if write exclusive initiator ports *NOT* holding the
 499          * WRITE_EXCLUSIVE_* reservation.
 500          */
 501         if (we && !registered_nexus) {
 502                 if (cmd->data_direction == DMA_TO_DEVICE) {
 503                         /*
 504                          * Conflict for write exclusive
 505                          */
 506                         pr_debug("%s Conflict for unregistered nexus"
 507                                 " %s CDB: 0x%02x to %s reservation\n",
 508                                 transport_dump_cmd_direction(cmd),
 509                                 se_sess->se_node_acl->initiatorname, cdb[0],
 510                                 core_scsi3_pr_dump_type(pr_reg_type));
 511                         return 1;
 512                 } else {
 513                         /*
 514                          * Allow non WRITE CDBs for all Write Exclusive
 515                          * PR TYPEs to pass for registered and
 516                          * non-registered_nexuxes NOT holding the reservation.
 517                          *
 518                          * We only make noise for the unregisterd nexuses,
 519                          * as we expect registered non-reservation holding
 520                          * nexuses to issue CDBs.
 521                          */
 522
 523                         if (!registered_nexus) {
 524                                 pr_debug("Allowing implicit CDB: 0x%02x"
 525                                         " for %s reservation on unregistered"
 526                                         " nexus\n", cdb[0],
 527                                         core_scsi3_pr_dump_type(pr_reg_type));
 528                         }
 529
 530                         return 0;
 531                 }
 532         } else if ((reg_only) || (all_reg)) {
 533                 if (registered_nexus) {
 534                         /*
 535                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 536                          * allow commands from registered nexuses.
 537                          */
 538
 539                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 540                                 " reservation\n", cdb[0],
 541                                 core_scsi3_pr_dump_type(pr_reg_type));
 542
 543                         return 0;
 544                 }
 545        } else if (we && registered_nexus) {
 546                /*
 547                 * Reads are allowed for Write Exclusive locks
 548                 * from all registrants.
 549                 */
 550                if (cmd->data_direction == DMA_FROM_DEVICE) {
 551                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 552                                " reservation\n", cdb[0],
 553                                core_scsi3_pr_dump_type(pr_reg_type));
 554
 555                        return 0;
 556                }
 557         }
 558         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 559                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 560                 (registered_nexus) ? "" : "un",
 561                 se_sess->se_node_acl->initiatorname, cdb[0],
 562                 core_scsi3_pr_dump_type(pr_reg_type));
 563
 564         return 1; /* Conflict by default */
 565 }
 566
 567 static sense_reason_t
 568 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 569 {
 570         struct se_device *dev = cmd->se_dev;
 571         struct se_session *sess = cmd->se_sess;
 572         u32 pr_reg_type;
 573         bool isid_mismatch = false;
 574
 575         if (!dev->dev_pr_res_holder)
 576                 return 0;
 577
 578         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 579         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 580         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 581                 goto check_nonholder;
 582
 583         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 584                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 585                     sess->sess_bin_isid) {
 586                         isid_mismatch = true;
 587                         goto check_nonholder;
 588                 }
 589         }
 590
 591         return 0;
 592
 593 check_nonholder:
 594         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 595                 return TCM_RESERVATION_CONFLICT;
 596         return 0;
 597 }
 598
 599 static u32 core_scsi3_pr_generation(struct se_device *dev)
 600 {
 601         u32 prg;
 602
 603         /*
 604          * PRGeneration field shall contain the value of a 32-bit wrapping
 605          * counter mainted by the device server.
 606          *
 607          * Note that this is done regardless of Active Persist across
 608          * Target PowerLoss (APTPL)
 609          *
 610          * See spc4r17 section 6.3.12 READ_KEYS service action
 611          */
 612         spin_lock(&dev->dev_reservation_lock);
 613         prg = dev->t10_pr.pr_generation++;
 614         spin_unlock(&dev->dev_reservation_lock);
 615
 616         return prg;
 617 }
 618
 619 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 620         struct se_device *dev,
 621         struct se_node_acl *nacl,
 622         struct se_lun *lun,
 623         struct se_dev_entry *dest_deve,
 624         u64 mapped_lun,
 625         unsigned char *isid,
 626         u64 sa_res_key,
 627         int all_tg_pt,
 628         int aptpl)
 629 {
 630         struct t10_pr_registration *pr_reg;
 631
 632         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 633         if (!pr_reg) {
 634                 pr_err("Unable to allocate struct t10_pr_registration\n");
 635                 return NULL;
 636         }
 637
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 640         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 641         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 642         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 643         atomic_set(&pr_reg->pr_res_holders, 0);
 644         pr_reg->pr_reg_nacl = nacl;
 645         /*
 646          * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
 647          * the se_dev_entry->pr_ref will have been already obtained by
 648          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 649          *
 650          * Otherwise, locate se_dev_entry now and obtain a reference until
 651          * registration completes in __core_scsi3_add_registration().
 652          */
 653         if (dest_deve) {
 654                 pr_reg->pr_reg_deve = dest_deve;
 655         } else {
 656                 rcu_read_lock();
 657                 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 658                 if (!pr_reg->pr_reg_deve) {
 659                         rcu_read_unlock();
 660                         pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
 661                                 nacl->initiatorname, mapped_lun);
 662                         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 663                         return NULL;
 664                 }
 665                 kref_get(&pr_reg->pr_reg_deve->pr_kref);
 666                 rcu_read_unlock();
 667         }
 668         pr_reg->pr_res_mapped_lun = mapped_lun;
 669         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 670         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 671         pr_reg->pr_res_key = sa_res_key;
 672         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 673         pr_reg->pr_reg_aptpl = aptpl;
 674         /*
 675          * If an ISID value for this SCSI Initiator Port exists,
 676          * save it to the registration now.
 677          */
 678         if (isid != NULL) {
 679                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 680                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 681                 pr_reg->isid_present_at_reg = 1;
 682         }
 683
 684         return pr_reg;
 685 }
 686
 687 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 688 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 689
 690 /*
 691  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 692  * modes.
 693  */
 694 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 695         struct se_device *dev,
 696         struct se_node_acl *nacl,
 697         struct se_lun *lun,
 698         struct se_dev_entry *deve,
 699         u64 mapped_lun,
 700         unsigned char *isid,
 701         u64 sa_res_key,
 702         int all_tg_pt,
 703         int aptpl)
 704 {
 705         struct se_dev_entry *deve_tmp;
 706         struct se_node_acl *nacl_tmp;
 707         struct se_lun_acl *lacl_tmp;
 708         struct se_lun *lun_tmp, *next, *dest_lun;
 709         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 710         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 711         int ret;
 712         /*
 713          * Create a registration for the I_T Nexus upon which the
 714          * PROUT REGISTER was received.
 715          */
 716         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 717                                                     isid, sa_res_key, all_tg_pt,
 718                                                     aptpl);
 719         if (!pr_reg)
 720                 return NULL;
 721         /*
 722          * Return pointer to pr_reg for ALL_TG_PT=0
 723          */
 724         if (!all_tg_pt)
 725                 return pr_reg;
 726         /*
 727          * Create list of matching SCSI Initiator Port registrations
 728          * for ALL_TG_PT=1
 729          */
 730         spin_lock(&dev->se_port_lock);
 731         list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
 732                 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
 733                         continue;
 734                 spin_unlock(&dev->se_port_lock);
 735
 736                 spin_lock(&lun_tmp->lun_deve_lock);
 737                 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 738                         /*
 739                          * This pointer will be NULL for demo mode MappedLUNs
 740                          * that have not been make explicit via a ConfigFS
 741                          * MappedLUN group for the SCSI Initiator Node ACL.
 742                          */
 743                         if (!deve_tmp->se_lun_acl)
 744                                 continue;
 745
 746                         lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
 747                                                 lockdep_is_held(&lun_tmp->lun_deve_lock));
 748                         nacl_tmp = lacl_tmp->se_lun_nacl;
 749                         /*
 750                          * Skip the matching struct se_node_acl that is allocated
 751                          * above..
 752                          */
 753                         if (nacl == nacl_tmp)
 754                                 continue;
 755                         /*
 756                          * Only perform PR registrations for target ports on
 757                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 758                          * arrived.
 759                          */
 760                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 761                                 continue;
 762                         /*
 763                          * Look for a matching Initiator Node ACL in ASCII format
 764                          */
 765                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 766                                 continue;
 767
 768                         kref_get(&deve_tmp->pr_kref);
 769                         spin_unlock(&lun_tmp->lun_deve_lock);
 770                         /*
 771                          * Grab a configfs group dependency that is released
 772                          * for the exception path at label out: below, or upon
 773                          * completion of adding ALL_TG_PT=1 registrations in
 774                          * __core_scsi3_add_registration()
 775                          */
 776                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 777                         if (ret < 0) {
 778                                 pr_err("core_scsi3_lunacl_depend"
 779                                                 "_item() failed\n");
 780                                 percpu_ref_put(&lun_tmp->lun_ref);
 781                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 782                                 goto out;
 783                         }
 784                         /*
 785                          * Located a matching SCSI Initiator Port on a different
 786                          * port, allocate the pr_reg_atp and attach it to the
 787                          * pr_reg->pr_reg_atp_list that will be processed once
 788                          * the original *pr_reg is processed in
 789                          * __core_scsi3_add_registration()
 790                          */
 791                         dest_lun = rcu_dereference_check(deve_tmp->se_lun,
 792                                 atomic_read(&deve_tmp->pr_kref.refcount) != 0);
 793
 794                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 795                                                 nacl_tmp, dest_lun, deve_tmp,
 796                                                 deve_tmp->mapped_lun, NULL,
 797                                                 sa_res_key, all_tg_pt, aptpl);
 798                         if (!pr_reg_atp) {
 799                                 percpu_ref_put(&lun_tmp->lun_ref);
 800                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 801                                 goto out;
 802                         }
 803
 804                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 805                                       &pr_reg->pr_reg_atp_list);
 806                         spin_lock(&lun_tmp->lun_deve_lock);
 807                 }
 808                 spin_unlock(&lun_tmp->lun_deve_lock);
 809
 810                 spin_lock(&dev->se_port_lock);
 811                 percpu_ref_put(&lun_tmp->lun_ref);
 812         }
 813         spin_unlock(&dev->se_port_lock);
 814
 815         return pr_reg;
 816 out:
 817         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 818                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 819                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 820                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 821                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 822         }
 823         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 824         return NULL;
 825 }
 826
 827 int core_scsi3_alloc_aptpl_registration(
 828         struct t10_reservation *pr_tmpl,
 829         u64 sa_res_key,
 830         unsigned char *i_port,
 831         unsigned char *isid,
 832         u64 mapped_lun,
 833         unsigned char *t_port,
 834         u16 tpgt,
 835         u64 target_lun,
 836         int res_holder,
 837         int all_tg_pt,
 838         u8 type)
 839 {
 840         struct t10_pr_registration *pr_reg;
 841
 842         if (!i_port || !t_port || !sa_res_key) {
 843                 pr_err("Illegal parameters for APTPL registration\n");
 844                 return -EINVAL;
 845         }
 846
 847         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 848         if (!pr_reg) {
 849                 pr_err("Unable to allocate struct t10_pr_registration\n");
 850                 return -ENOMEM;
 851         }
 852
 853         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 854         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 855         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 856         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 857         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 858         atomic_set(&pr_reg->pr_res_holders, 0);
 859         pr_reg->pr_reg_nacl = NULL;
 860         pr_reg->pr_reg_deve = NULL;
 861         pr_reg->pr_res_mapped_lun = mapped_lun;
 862         pr_reg->pr_aptpl_target_lun = target_lun;
 863         pr_reg->pr_res_key = sa_res_key;
 864         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 865         pr_reg->pr_reg_aptpl = 1;
 866         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 867         pr_reg->pr_res_type = type;
 868         /*
 869          * If an ISID value had been saved in APTPL metadata for this
 870          * SCSI Initiator Port, restore it now.
 871          */
 872         if (isid != NULL) {
 873                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 874                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 875                 pr_reg->isid_present_at_reg = 1;
 876         }
 877         /*
 878          * Copy the i_port and t_port information from caller.
 879          */
 880         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 881         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 882         pr_reg->pr_reg_tpgt = tpgt;
 883         /*
 884          * Set pr_res_holder from caller, the pr_reg who is the reservation
 885          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 886          * the Initiator Node LUN ACL from the fabric module is created for
 887          * this registration.
 888          */
 889         pr_reg->pr_res_holder = res_holder;
 890
 891         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 892         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 893                         " metadata\n", (res_holder) ? "+reservation" : "");
 894         return 0;
 895 }
 896
 897 static void core_scsi3_aptpl_reserve(
 898         struct se_device *dev,
 899         struct se_portal_group *tpg,
 900         struct se_node_acl *node_acl,
 901         struct t10_pr_registration *pr_reg)
 902 {
 903         char i_buf[PR_REG_ISID_ID_LEN];
 904
 905         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 906         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 907
 908         spin_lock(&dev->dev_reservation_lock);
 909         dev->dev_pr_res_holder = pr_reg;
 910         spin_unlock(&dev->dev_reservation_lock);
 911
 912         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 913                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 914                 tpg->se_tpg_tfo->get_fabric_name(),
 915                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 916                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 917         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 918                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 919                 i_buf);
 920 }
 921
 922 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 923                                 struct t10_pr_registration *, enum register_type, int);
 924
 925 static int __core_scsi3_check_aptpl_registration(
 926         struct se_device *dev,
 927         struct se_portal_group *tpg,
 928         struct se_lun *lun,
 929         u64 target_lun,
 930         struct se_node_acl *nacl,
 931         u64 mapped_lun)
 932 {
 933         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 934         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 935         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 936         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 937         u16 tpgt;
 938
 939         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 940         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 941         /*
 942          * Copy Initiator Port information from struct se_node_acl
 943          */
 944         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 945         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 946                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 947         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 948         /*
 949          * Look for the matching registrations+reservation from those
 950          * created from APTPL metadata.  Note that multiple registrations
 951          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 952          * TransportIDs.
 953          */
 954         spin_lock(&pr_tmpl->aptpl_reg_lock);
 955         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 956                                 pr_reg_aptpl_list) {
 957
 958                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 959                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 960                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 961                      (pr_reg->pr_reg_tpgt == tpgt) &&
 962                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 963                         /*
 964                          * Obtain the ->pr_reg_deve pointer + reference, that
 965                          * is released by __core_scsi3_add_registration() below.
 966                          */
 967                         rcu_read_lock();
 968                         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 969                         if (!pr_reg->pr_reg_deve) {
 970                                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
 971                                         " %llu\n", nacl->initiatorname, mapped_lun);
 972                                 rcu_read_unlock();
 973                                 continue;
 974                         }
 975                         kref_get(&pr_reg->pr_reg_deve->pr_kref);
 976                         rcu_read_unlock();
 977
 978                         pr_reg->pr_reg_nacl = nacl;
 979                         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 980                         list_del(&pr_reg->pr_reg_aptpl_list);
 981                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 982                         /*
 983                          * At this point all of the pointers in *pr_reg will
 984                          * be setup, so go ahead and add the registration.
 985                          */
 986                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 987                         /*
 988                          * If this registration is the reservation holder,
 989                          * make that happen now..
 990                          */
 991                         if (pr_reg->pr_res_holder)
 992                                 core_scsi3_aptpl_reserve(dev, tpg,
 993                                                 nacl, pr_reg);
 994                         /*
 995                          * Reenable pr_aptpl_active to accept new metadata
 996                          * updates once the SCSI device is active again..
 997                          */
 998                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 999                         pr_tmpl->pr_aptpl_active = 1;
1000                 }
1001         }
1002         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1003
1004         return 0;
1005 }
1006
1007 int core_scsi3_check_aptpl_registration(
1008         struct se_device *dev,
1009         struct se_portal_group *tpg,
1010         struct se_lun *lun,
1011         struct se_node_acl *nacl,
1012         u64 mapped_lun)
1013 {
1014         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1015                 return 0;
1016
1017         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1018                                                      lun->unpacked_lun, nacl,
1019                                                      mapped_lun);
1020 }
1021
1022 static void __core_scsi3_dump_registration(
1023         const struct target_core_fabric_ops *tfo,
1024         struct se_device *dev,
1025         struct se_node_acl *nacl,
1026         struct t10_pr_registration *pr_reg,
1027         enum register_type register_type)
1028 {
1029         struct se_portal_group *se_tpg = nacl->se_tpg;
1030         char i_buf[PR_REG_ISID_ID_LEN];
1031
1032         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1033         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1034
1035         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1036                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1037                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1038                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1039                 i_buf);
1040         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1041                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1042                 tfo->tpg_get_tag(se_tpg));
1043         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1044                 " Port(s)\n",  tfo->get_fabric_name(),
1045                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1046                 dev->transport->name);
1047         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1048                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1049                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1050                 pr_reg->pr_reg_aptpl);
1051 }
1052
1053 static void __core_scsi3_add_registration(
1054         struct se_device *dev,
1055         struct se_node_acl *nacl,
1056         struct t10_pr_registration *pr_reg,
1057         enum register_type register_type,
1058         int register_move)
1059 {
1060         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1061         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1062         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1063         struct se_dev_entry *deve;
1064
1065         /*
1066          * Increment PRgeneration counter for struct se_device upon a successful
1067          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1068          *
1069          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1070          * action, the struct se_device->dev_reservation_lock will already be held,
1071          * so we do not call core_scsi3_pr_generation() which grabs the lock
1072          * for the REGISTER.
1073          */
1074         pr_reg->pr_res_generation = (register_move) ?
1075                         dev->t10_pr.pr_generation++ :
1076                         core_scsi3_pr_generation(dev);
1077
1078         spin_lock(&pr_tmpl->registration_lock);
1079         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1080
1081         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1082         spin_unlock(&pr_tmpl->registration_lock);
1083         /*
1084          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1085          */
1086         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1087                 goto out;
1088         /*
1089          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1090          * allocated in __core_scsi3_alloc_registration()
1091          */
1092         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1093                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1094                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1095
1096                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1097
1098                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1099
1100                 spin_lock(&pr_tmpl->registration_lock);
1101                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1102                               &pr_tmpl->registration_list);
1103
1104                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1105                                                register_type);
1106                 spin_unlock(&pr_tmpl->registration_lock);
1107                 /*
1108                  * Drop configfs group dependency reference and deve->pr_kref
1109                  * obtained from  __core_scsi3_alloc_registration() code.
1110                  */
1111                 rcu_read_lock();
1112                 deve = pr_reg_tmp->pr_reg_deve;
1113                 if (deve) {
1114                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1115                         core_scsi3_lunacl_undepend_item(deve);
1116                         pr_reg_tmp->pr_reg_deve = NULL;
1117                 }
1118                 rcu_read_unlock();
1119         }
1120 out:
1121         /*
1122          * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1123          */
1124         rcu_read_lock();
1125         deve = pr_reg->pr_reg_deve;
1126         if (deve) {
1127                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1128                 kref_put(&deve->pr_kref, target_pr_kref_release);
1129                 pr_reg->pr_reg_deve = NULL;
1130         }
1131         rcu_read_unlock();
1132 }
1133
1134 static int core_scsi3_alloc_registration(
1135         struct se_device *dev,
1136         struct se_node_acl *nacl,
1137         struct se_lun *lun,
1138         struct se_dev_entry *deve,
1139         u64 mapped_lun,
1140         unsigned char *isid,
1141         u64 sa_res_key,
1142         int all_tg_pt,
1143         int aptpl,
1144         enum register_type register_type,
1145         int register_move)
1146 {
1147         struct t10_pr_registration *pr_reg;
1148
1149         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1150                                                  isid, sa_res_key, all_tg_pt,
1151                                                  aptpl);
1152         if (!pr_reg)
1153                 return -EPERM;
1154
1155         __core_scsi3_add_registration(dev, nacl, pr_reg,
1156                         register_type, register_move);
1157         return 0;
1158 }
1159
1160 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1161         struct se_device *dev,
1162         struct se_node_acl *nacl,
1163         unsigned char *isid)
1164 {
1165         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1166         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1167         struct se_portal_group *tpg;
1168
1169         spin_lock(&pr_tmpl->registration_lock);
1170         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1171                         &pr_tmpl->registration_list, pr_reg_list) {
1172                 /*
1173                  * First look for a matching struct se_node_acl
1174                  */
1175                 if (pr_reg->pr_reg_nacl != nacl)
1176                         continue;
1177
1178                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1179                 /*
1180                  * If this registration does NOT contain a fabric provided
1181                  * ISID, then we have found a match.
1182                  */
1183                 if (!pr_reg->isid_present_at_reg) {
1184                         /*
1185                          * Determine if this SCSI device server requires that
1186                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1187                          * for fabric modules (iSCSI) requiring them.
1188                          */
1189                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1190                                 if (dev->dev_attrib.enforce_pr_isids)
1191                                         continue;
1192                         }
1193                         atomic_inc_mb(&pr_reg->pr_res_holders);
1194                         spin_unlock(&pr_tmpl->registration_lock);
1195                         return pr_reg;
1196                 }
1197                 /*
1198                  * If the *pr_reg contains a fabric defined ISID for multi-value
1199                  * SCSI Initiator Port TransportIDs, then we expect a valid
1200                  * matching ISID to be provided by the local SCSI Initiator Port.
1201                  */
1202                 if (!isid)
1203                         continue;
1204                 if (strcmp(isid, pr_reg->pr_reg_isid))
1205                         continue;
1206
1207                 atomic_inc_mb(&pr_reg->pr_res_holders);
1208                 spin_unlock(&pr_tmpl->registration_lock);
1209                 return pr_reg;
1210         }
1211         spin_unlock(&pr_tmpl->registration_lock);
1212
1213         return NULL;
1214 }
1215
1216 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1217         struct se_device *dev,
1218         struct se_node_acl *nacl,
1219         struct se_session *sess)
1220 {
1221         struct se_portal_group *tpg = nacl->se_tpg;
1222         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1223
1224         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1225                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1226                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1227                                         PR_REG_ISID_LEN);
1228                 isid_ptr = &buf[0];
1229         }
1230
1231         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1232 }
1233
1234 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1235 {
1236         atomic_dec_mb(&pr_reg->pr_res_holders);
1237 }
1238
1239 static int core_scsi3_check_implicit_release(
1240         struct se_device *dev,
1241         struct t10_pr_registration *pr_reg)
1242 {
1243         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1244         struct t10_pr_registration *pr_res_holder;
1245         int ret = 0;
1246
1247         spin_lock(&dev->dev_reservation_lock);
1248         pr_res_holder = dev->dev_pr_res_holder;
1249         if (!pr_res_holder) {
1250                 spin_unlock(&dev->dev_reservation_lock);
1251                 return ret;
1252         }
1253         if (pr_res_holder == pr_reg) {
1254                 /*
1255                  * Perform an implicit RELEASE if the registration that
1256                  * is being released is holding the reservation.
1257                  *
1258                  * From spc4r17, section 5.7.11.1:
1259                  *
1260                  * e) If the I_T nexus is the persistent reservation holder
1261                  *    and the persistent reservation is not an all registrants
1262                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1263                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1264                  *    service action with the SERVICE ACTION RESERVATION KEY
1265                  *    field set to zero (see 5.7.11.3).
1266                  */
1267                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1268                 ret = 1;
1269                 /*
1270                  * For 'All Registrants' reservation types, all existing
1271                  * registrations are still processed as reservation holders
1272                  * in core_scsi3_pr_seq_non_holder() after the initial
1273                  * reservation holder is implicitly released here.
1274                  */
1275         } else if (pr_reg->pr_reg_all_tg_pt &&
1276                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1277                           pr_reg->pr_reg_nacl->initiatorname)) &&
1278                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1279                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1280                         " UNREGISTER while existing reservation with matching"
1281                         " key 0x%016Lx is present from another SCSI Initiator"
1282                         " Port\n", pr_reg->pr_res_key);
1283                 ret = -EPERM;
1284         }
1285         spin_unlock(&dev->dev_reservation_lock);
1286
1287         return ret;
1288 }
1289
1290 /*
1291  * Called with struct t10_reservation->registration_lock held.
1292  */
1293 static void __core_scsi3_free_registration(
1294         struct se_device *dev,
1295         struct t10_pr_registration *pr_reg,
1296         struct list_head *preempt_and_abort_list,
1297         int dec_holders)
1298         __releases(&pr_tmpl->registration_lock)
1299         __acquires(&pr_tmpl->registration_lock)
1300 {
1301         const struct target_core_fabric_ops *tfo =
1302                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1303         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1304         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1305         struct se_dev_entry *deve;
1306         char i_buf[PR_REG_ISID_ID_LEN];
1307
1308         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1309         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1310
1311         if (!list_empty(&pr_reg->pr_reg_list))
1312                 list_del(&pr_reg->pr_reg_list);
1313         /*
1314          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1315          * so call core_scsi3_put_pr_reg() to decrement our reference.
1316          */
1317         if (dec_holders)
1318                 core_scsi3_put_pr_reg(pr_reg);
1319
1320         spin_unlock(&pr_tmpl->registration_lock);
1321         /*
1322          * Wait until all reference from any other I_T nexuses for this
1323          * *pr_reg have been released.  Because list_del() is called above,
1324          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1325          * count back to zero, and we release *pr_reg.
1326          */
1327         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1328                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1329                                 tfo->get_fabric_name());
1330                 cpu_relax();
1331         }
1332
1333         rcu_read_lock();
1334         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1335         if (deve)
1336                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1337         rcu_read_unlock();
1338
1339         spin_lock(&pr_tmpl->registration_lock);
1340         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1341                 " Node: %s%s\n", tfo->get_fabric_name(),
1342                 pr_reg->pr_reg_nacl->initiatorname,
1343                 i_buf);
1344         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1345                 " Port(s)\n", tfo->get_fabric_name(),
1346                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1347                 dev->transport->name);
1348         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1349                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1350                 pr_reg->pr_res_generation);
1351
1352         if (!preempt_and_abort_list) {
1353                 pr_reg->pr_reg_deve = NULL;
1354                 pr_reg->pr_reg_nacl = NULL;
1355                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1356                 return;
1357         }
1358         /*
1359          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1360          * are released once the ABORT_TASK_SET has completed..
1361          */
1362         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1363 }
1364
1365 void core_scsi3_free_pr_reg_from_nacl(
1366         struct se_device *dev,
1367         struct se_node_acl *nacl)
1368 {
1369         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1370         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1371         bool free_reg = false;
1372         /*
1373          * If the passed se_node_acl matches the reservation holder,
1374          * release the reservation.
1375          */
1376         spin_lock(&dev->dev_reservation_lock);
1377         pr_res_holder = dev->dev_pr_res_holder;
1378         if ((pr_res_holder != NULL) &&
1379             (pr_res_holder->pr_reg_nacl == nacl)) {
1380                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1381                 free_reg = true;
1382         }
1383         spin_unlock(&dev->dev_reservation_lock);
1384         /*
1385          * Release any registration associated with the struct se_node_acl.
1386          */
1387         spin_lock(&pr_tmpl->registration_lock);
1388         if (pr_res_holder && free_reg)
1389                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1390
1391         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1392                         &pr_tmpl->registration_list, pr_reg_list) {
1393
1394                 if (pr_reg->pr_reg_nacl != nacl)
1395                         continue;
1396
1397                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1398         }
1399         spin_unlock(&pr_tmpl->registration_lock);
1400 }
1401
1402 void core_scsi3_free_all_registrations(
1403         struct se_device *dev)
1404 {
1405         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1406         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1407
1408         spin_lock(&dev->dev_reservation_lock);
1409         pr_res_holder = dev->dev_pr_res_holder;
1410         if (pr_res_holder != NULL) {
1411                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1412                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1413                                                   pr_res_holder, 0, 0);
1414         }
1415         spin_unlock(&dev->dev_reservation_lock);
1416
1417         spin_lock(&pr_tmpl->registration_lock);
1418         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1419                         &pr_tmpl->registration_list, pr_reg_list) {
1420
1421                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1422         }
1423         spin_unlock(&pr_tmpl->registration_lock);
1424
1425         spin_lock(&pr_tmpl->aptpl_reg_lock);
1426         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1427                                 pr_reg_aptpl_list) {
1428                 list_del(&pr_reg->pr_reg_aptpl_list);
1429                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1430         }
1431         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1432 }
1433
1434 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1435 {
1436         return target_depend_item(&tpg->tpg_group.cg_item);
1437 }
1438
1439 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1440 {
1441         target_undepend_item(&tpg->tpg_group.cg_item);
1442         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1443 }
1444
1445 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1446 {
1447         if (nacl->dynamic_node_acl)
1448                 return 0;
1449         return target_depend_item(&nacl->acl_group.cg_item);
1450 }
1451
1452 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1453 {
1454         if (!nacl->dynamic_node_acl)
1455                 target_undepend_item(&nacl->acl_group.cg_item);
1456         atomic_dec_mb(&nacl->acl_pr_ref_count);
1457 }
1458
1459 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1460 {
1461         struct se_lun_acl *lun_acl;
1462
1463         /*
1464          * For nacl->dynamic_node_acl=1
1465          */
1466         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1467                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1468         if (!lun_acl)
1469                 return 0;
1470
1471         return target_depend_item(&lun_acl->se_lun_group.cg_item);
1472 }
1473
1474 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1475 {
1476         struct se_lun_acl *lun_acl;
1477
1478         /*
1479          * For nacl->dynamic_node_acl=1
1480          */
1481         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1482                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1483         if (!lun_acl) {
1484                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1485                 return;
1486         }
1487
1488         target_undepend_item(&lun_acl->se_lun_group.cg_item);
1489         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1490 }
1491
1492 static sense_reason_t
1493 core_scsi3_decode_spec_i_port(
1494         struct se_cmd *cmd,
1495         struct se_portal_group *tpg,
1496         unsigned char *l_isid,
1497         u64 sa_res_key,
1498         int all_tg_pt,
1499         int aptpl)
1500 {
1501         struct se_device *dev = cmd->se_dev;
1502         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1503         struct se_session *se_sess = cmd->se_sess;
1504         struct se_node_acl *dest_node_acl = NULL;
1505         struct se_dev_entry *dest_se_deve = NULL;
1506         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1507         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1508         LIST_HEAD(tid_dest_list);
1509         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1510         unsigned char *buf, *ptr, proto_ident;
1511         const unsigned char *i_str = NULL;
1512         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1513         sense_reason_t ret;
1514         u32 tpdl, tid_len = 0;
1515         u32 dest_rtpi = 0;
1516
1517         /*
1518          * Allocate a struct pr_transport_id_holder and setup the
1519          * local_node_acl pointer and add to struct list_head tid_dest_list
1520          * for add registration processing in the loop of tid_dest_list below.
1521          */
1522         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1523         if (!tidh_new) {
1524                 pr_err("Unable to allocate tidh_new\n");
1525                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1526         }
1527         INIT_LIST_HEAD(&tidh_new->dest_list);
1528         tidh_new->dest_tpg = tpg;
1529         tidh_new->dest_node_acl = se_sess->se_node_acl;
1530
1531         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1532                                 se_sess->se_node_acl, cmd->se_lun,
1533                                 NULL, cmd->orig_fe_lun, l_isid,
1534                                 sa_res_key, all_tg_pt, aptpl);
1535         if (!local_pr_reg) {
1536                 kfree(tidh_new);
1537                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1538         }
1539         tidh_new->dest_pr_reg = local_pr_reg;
1540         /*
1541          * The local I_T nexus does not hold any configfs dependances,
1542          * so we set tidh_new->dest_se_deve to NULL to prevent the
1543          * configfs_undepend_item() calls in the tid_dest_list loops below.
1544          */
1545         tidh_new->dest_se_deve = NULL;
1546         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1547
1548         if (cmd->data_length < 28) {
1549                 pr_warn("SPC-PR: Received PR OUT parameter list"
1550                         " length too small: %u\n", cmd->data_length);
1551                 ret = TCM_INVALID_PARAMETER_LIST;
1552                 goto out;
1553         }
1554
1555         buf = transport_kmap_data_sg(cmd);
1556         if (!buf) {
1557                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1558                 goto out;
1559         }
1560
1561         /*
1562          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1563          * first extract TransportID Parameter Data Length, and make sure
1564          * the value matches up to the SCSI expected data transfer length.
1565          */
1566         tpdl = (buf[24] & 0xff) << 24;
1567         tpdl |= (buf[25] & 0xff) << 16;
1568         tpdl |= (buf[26] & 0xff) << 8;
1569         tpdl |= buf[27] & 0xff;
1570
1571         if ((tpdl + 28) != cmd->data_length) {
1572                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1573                         " does not equal CDB data_length: %u\n", tpdl,
1574                         cmd->data_length);
1575                 ret = TCM_INVALID_PARAMETER_LIST;
1576                 goto out_unmap;
1577         }
1578         /*
1579          * Start processing the received transport IDs using the
1580          * receiving I_T Nexus portal's fabric dependent methods to
1581          * obtain the SCSI Initiator Port/Device Identifiers.
1582          */
1583         ptr = &buf[28];
1584
1585         while (tpdl > 0) {
1586                 struct se_lun *dest_lun, *tmp_lun;
1587
1588                 proto_ident = (ptr[0] & 0x0f);
1589                 dest_tpg = NULL;
1590
1591                 spin_lock(&dev->se_port_lock);
1592                 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1593                         tmp_tpg = tmp_lun->lun_tpg;
1594
1595                         /*
1596                          * Look for the matching proto_ident provided by
1597                          * the received TransportID
1598                          */
1599                         if (tmp_tpg->proto_id != proto_ident)
1600                                 continue;
1601                         dest_rtpi = tmp_lun->lun_rtpi;
1602
1603                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1604                                         (const char *)ptr, &tid_len, &iport_ptr);
1605                         if (!i_str)
1606                                 continue;
1607
1608                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1609                         spin_unlock(&dev->se_port_lock);
1610
1611                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1612                                 pr_err(" core_scsi3_tpg_depend_item()"
1613                                         " for tmp_tpg\n");
1614                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1615                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1616                                 goto out_unmap;
1617                         }
1618                         /*
1619                          * Locate the destination initiator ACL to be registered
1620                          * from the decoded fabric module specific TransportID
1621                          * at *i_str.
1622                          */
1623                         mutex_lock(&tmp_tpg->acl_node_mutex);
1624                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1625                                                 tmp_tpg, i_str);
1626                         if (dest_node_acl)
1627                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1628                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1629
1630                         if (!dest_node_acl) {
1631                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1632                                 spin_lock(&dev->se_port_lock);
1633                                 continue;
1634                         }
1635
1636                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1637                                 pr_err("configfs_depend_item() failed"
1638                                         " for dest_node_acl->acl_group\n");
1639                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1640                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1641                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1642                                 goto out_unmap;
1643                         }
1644
1645                         dest_tpg = tmp_tpg;
1646                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1647                                 " %s Port RTPI: %hu\n",
1648                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1649                                 dest_node_acl->initiatorname, dest_rtpi);
1650
1651                         spin_lock(&dev->se_port_lock);
1652                         break;
1653                 }
1654                 spin_unlock(&dev->se_port_lock);
1655
1656                 if (!dest_tpg) {
1657                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1658                                         " dest_tpg\n");
1659                         ret = TCM_INVALID_PARAMETER_LIST;
1660                         goto out_unmap;
1661                 }
1662
1663                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1664                         " tid_len: %d for %s + %s\n",
1665                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1666                         tpdl, tid_len, i_str, iport_ptr);
1667
1668                 if (tid_len > tpdl) {
1669                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1670                                 " %u for Transport ID: %s\n", tid_len, ptr);
1671                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1672                         core_scsi3_tpg_undepend_item(dest_tpg);
1673                         ret = TCM_INVALID_PARAMETER_LIST;
1674                         goto out_unmap;
1675                 }
1676                 /*
1677                  * Locate the desintation struct se_dev_entry pointer for matching
1678                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1679                  * Target Port.
1680                  */
1681                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1682                                         dest_rtpi);
1683                 if (!dest_se_deve) {
1684                         pr_err("Unable to locate %s dest_se_deve"
1685                                 " from destination RTPI: %hu\n",
1686                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1687                                 dest_rtpi);
1688
1689                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1690                         core_scsi3_tpg_undepend_item(dest_tpg);
1691                         ret = TCM_INVALID_PARAMETER_LIST;
1692                         goto out_unmap;
1693                 }
1694
1695                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1696                         pr_err("core_scsi3_lunacl_depend_item()"
1697                                         " failed\n");
1698                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1699                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1700                         core_scsi3_tpg_undepend_item(dest_tpg);
1701                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1702                         goto out_unmap;
1703                 }
1704
1705                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1706                         " dest_se_deve mapped_lun: %llu\n",
1707                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1708                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1709
1710                 /*
1711                  * Skip any TransportIDs that already have a registration for
1712                  * this target port.
1713                  */
1714                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1715                                         iport_ptr);
1716                 if (pr_reg_e) {
1717                         core_scsi3_put_pr_reg(pr_reg_e);
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                         ptr += tid_len;
1722                         tpdl -= tid_len;
1723                         tid_len = 0;
1724                         continue;
1725                 }
1726                 /*
1727                  * Allocate a struct pr_transport_id_holder and setup
1728                  * the dest_node_acl and dest_se_deve pointers for the
1729                  * loop below.
1730                  */
1731                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1732                                 GFP_KERNEL);
1733                 if (!tidh_new) {
1734                         pr_err("Unable to allocate tidh_new\n");
1735                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1736                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1737                         core_scsi3_tpg_undepend_item(dest_tpg);
1738                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1739                         goto out_unmap;
1740                 }
1741                 INIT_LIST_HEAD(&tidh_new->dest_list);
1742                 tidh_new->dest_tpg = dest_tpg;
1743                 tidh_new->dest_node_acl = dest_node_acl;
1744                 tidh_new->dest_se_deve = dest_se_deve;
1745
1746                 /*
1747                  * Allocate, but do NOT add the registration for the
1748                  * TransportID referenced SCSI Initiator port.  This
1749                  * done because of the following from spc4r17 in section
1750                  * 6.14.3 wrt SPEC_I_PT:
1751                  *
1752                  * "If a registration fails for any initiator port (e.g., if th
1753                  * logical unit does not have enough resources available to
1754                  * hold the registration information), no registrations shall be
1755                  * made, and the command shall be terminated with
1756                  * CHECK CONDITION status."
1757                  *
1758                  * That means we call __core_scsi3_alloc_registration() here,
1759                  * and then call __core_scsi3_add_registration() in the
1760                  * 2nd loop which will never fail.
1761                  */
1762                 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1763                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
1764
1765                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1766                                         dest_node_acl, dest_lun, dest_se_deve,
1767                                         dest_se_deve->mapped_lun, iport_ptr,
1768                                         sa_res_key, all_tg_pt, aptpl);
1769                 if (!dest_pr_reg) {
1770                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1771                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1772                         core_scsi3_tpg_undepend_item(dest_tpg);
1773                         kfree(tidh_new);
1774                         ret = TCM_INVALID_PARAMETER_LIST;
1775                         goto out_unmap;
1776                 }
1777                 tidh_new->dest_pr_reg = dest_pr_reg;
1778                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1779
1780                 ptr += tid_len;
1781                 tpdl -= tid_len;
1782                 tid_len = 0;
1783
1784         }
1785
1786         transport_kunmap_data_sg(cmd);
1787
1788         /*
1789          * Go ahead and create a registrations from tid_dest_list for the
1790          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1791          * and dest_se_deve.
1792          *
1793          * The SA Reservation Key from the PROUT is set for the
1794          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1795          * means that the TransportID Initiator port will be
1796          * registered on all of the target ports in the SCSI target device
1797          * ALL_TG_PT=0 means the registration will only be for the
1798          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1799          * was received.
1800          */
1801         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1802                 dest_tpg = tidh->dest_tpg;
1803                 dest_node_acl = tidh->dest_node_acl;
1804                 dest_se_deve = tidh->dest_se_deve;
1805                 dest_pr_reg = tidh->dest_pr_reg;
1806
1807                 list_del(&tidh->dest_list);
1808                 kfree(tidh);
1809
1810                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1811                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1812
1813                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1814                                         dest_pr_reg, 0, 0);
1815
1816                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1817                         " registered Transport ID for Node: %s%s Mapped LUN:"
1818                         " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1819                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1820                         dest_se_deve->mapped_lun : 0);
1821
1822                 if (!dest_se_deve) {
1823                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1824                                  target_pr_kref_release);
1825                         continue;
1826                 }
1827                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1828                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1829                 core_scsi3_tpg_undepend_item(dest_tpg);
1830         }
1831
1832         return 0;
1833 out_unmap:
1834         transport_kunmap_data_sg(cmd);
1835 out:
1836         /*
1837          * For the failure case, release everything from tid_dest_list
1838          * including *dest_pr_reg and the configfs dependances..
1839          */
1840         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1841                 dest_tpg = tidh->dest_tpg;
1842                 dest_node_acl = tidh->dest_node_acl;
1843                 dest_se_deve = tidh->dest_se_deve;
1844                 dest_pr_reg = tidh->dest_pr_reg;
1845
1846                 list_del(&tidh->dest_list);
1847                 kfree(tidh);
1848                 /*
1849                  * Release any extra ALL_TG_PT=1 registrations for
1850                  * the SPEC_I_PT=1 case.
1851                  */
1852                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1853                                 &dest_pr_reg->pr_reg_atp_list,
1854                                 pr_reg_atp_mem_list) {
1855                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1856                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1857                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1858                 }
1859
1860                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1861
1862                 if (!dest_se_deve) {
1863                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1864                                  target_pr_kref_release);
1865                         continue;
1866                 }
1867                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1868                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1869                 core_scsi3_tpg_undepend_item(dest_tpg);
1870         }
1871         return ret;
1872 }
1873
1874 static int core_scsi3_update_aptpl_buf(
1875         struct se_device *dev,
1876         unsigned char *buf,
1877         u32 pr_aptpl_buf_len)
1878 {
1879         struct se_portal_group *tpg;
1880         struct t10_pr_registration *pr_reg;
1881         unsigned char tmp[512], isid_buf[32];
1882         ssize_t len = 0;
1883         int reg_count = 0;
1884         int ret = 0;
1885
1886         spin_lock(&dev->dev_reservation_lock);
1887         spin_lock(&dev->t10_pr.registration_lock);
1888         /*
1889          * Walk the registration list..
1890          */
1891         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1892                         pr_reg_list) {
1893
1894                 tmp[0] = '\0';
1895                 isid_buf[0] = '\0';
1896                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1897                 /*
1898                  * Write out any ISID value to APTPL metadata that was included
1899                  * in the original registration.
1900                  */
1901                 if (pr_reg->isid_present_at_reg)
1902                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1903                                         pr_reg->pr_reg_isid);
1904                 /*
1905                  * Include special metadata if the pr_reg matches the
1906                  * reservation holder.
1907                  */
1908                 if (dev->dev_pr_res_holder == pr_reg) {
1909                         snprintf(tmp, 512, "PR_REG_START: %d"
1910                                 "\ninitiator_fabric=%s\n"
1911                                 "initiator_node=%s\n%s"
1912                                 "sa_res_key=%llu\n"
1913                                 "res_holder=1\nres_type=%02x\n"
1914                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1915                                 "mapped_lun=%llu\n", reg_count,
1916                                 tpg->se_tpg_tfo->get_fabric_name(),
1917                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1918                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1919                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1920                                 pr_reg->pr_res_mapped_lun);
1921                 } else {
1922                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1923                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1924                                 "sa_res_key=%llu\nres_holder=0\n"
1925                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1926                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1927                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1928                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1929                                 pr_reg->pr_res_mapped_lun);
1930                 }
1931
1932                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1933                         pr_err("Unable to update renaming APTPL metadata,"
1934                                " reallocating larger buffer\n");
1935                         ret = -EMSGSIZE;
1936                         goto out;
1937                 }
1938                 len += sprintf(buf+len, "%s", tmp);
1939
1940                 /*
1941                  * Include information about the associated SCSI target port.
1942                  */
1943                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1944                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1945                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1946                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1947                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1948                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1949                         reg_count);
1950
1951                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1952                         pr_err("Unable to update renaming APTPL metadata,"
1953                                " reallocating larger buffer\n");
1954                         ret = -EMSGSIZE;
1955                         goto out;
1956                 }
1957                 len += sprintf(buf+len, "%s", tmp);
1958                 reg_count++;
1959         }
1960
1961         if (!reg_count)
1962                 len += sprintf(buf+len, "No Registrations or Reservations");
1963
1964 out:
1965         spin_unlock(&dev->t10_pr.registration_lock);
1966         spin_unlock(&dev->dev_reservation_lock);
1967
1968         return ret;
1969 }
1970
1971 static int __core_scsi3_write_aptpl_to_file(
1972         struct se_device *dev,
1973         unsigned char *buf)
1974 {
1975         struct t10_wwn *wwn = &dev->t10_wwn;
1976         struct file *file;
1977         int flags = O_RDWR | O_CREAT | O_TRUNC;
1978         char path[512];
1979         u32 pr_aptpl_buf_len;
1980         int ret;
1981
1982         memset(path, 0, 512);
1983
1984         if (strlen(&wwn->unit_serial[0]) >= 512) {
1985                 pr_err("WWN value for struct se_device does not fit"
1986                         " into path buffer\n");
1987                 return -EMSGSIZE;
1988         }
1989
1990         snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]);
1991         file = filp_open(path, flags, 0600);
1992         if (IS_ERR(file)) {
1993                 pr_err("filp_open(%s) for APTPL metadata"
1994                         " failed\n", path);
1995                 return PTR_ERR(file);
1996         }
1997
1998         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1999
2000         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
2001
2002         if (ret < 0)
2003                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2004         fput(file);
2005
2006         return (ret < 0) ? -EIO : 0;
2007 }
2008
2009 /*
2010  * Clear the APTPL metadata if APTPL has been disabled, otherwise
2011  * write out the updated metadata to struct file for this SCSI device.
2012  */
2013 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
2014 {
2015         unsigned char *buf;
2016         int rc, len = PR_APTPL_BUF_LEN;
2017
2018         if (!aptpl) {
2019                 char *null_buf = "No Registrations or Reservations\n";
2020
2021                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2022                 dev->t10_pr.pr_aptpl_active = 0;
2023                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2024
2025                 if (rc)
2026                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2027
2028                 return 0;
2029         }
2030 retry:
2031         buf = vzalloc(len);
2032         if (!buf)
2033                 return TCM_OUT_OF_RESOURCES;
2034
2035         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2036         if (rc < 0) {
2037                 vfree(buf);
2038                 len *= 2;
2039                 goto retry;
2040         }
2041
2042         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2043         if (rc != 0) {
2044                 pr_err("SPC-3 PR: Could not update APTPL\n");
2045                 vfree(buf);
2046                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2047         }
2048         dev->t10_pr.pr_aptpl_active = 1;
2049         vfree(buf);
2050         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2051         return 0;
2052 }
2053
2054 static sense_reason_t
2055 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2056                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2057 {
2058         struct se_session *se_sess = cmd->se_sess;
2059         struct se_device *dev = cmd->se_dev;
2060         struct se_lun *se_lun = cmd->se_lun;
2061         struct se_portal_group *se_tpg;
2062         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2063         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2064         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2065         sense_reason_t ret = TCM_NO_SENSE;
2066         int pr_holder = 0, type;
2067
2068         if (!se_sess || !se_lun) {
2069                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2070                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2071         }
2072         se_tpg = se_sess->se_tpg;
2073
2074         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2075                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2076                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2077                                 PR_REG_ISID_LEN);
2078                 isid_ptr = &isid_buf[0];
2079         }
2080         /*
2081          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2082          */
2083         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2084         if (!pr_reg) {
2085                 if (res_key) {
2086                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2087                                 " for SA REGISTER, returning CONFLICT\n");
2088                         return TCM_RESERVATION_CONFLICT;
2089                 }
2090                 /*
2091                  * Do nothing but return GOOD status.
2092                  */
2093                 if (!sa_res_key)
2094                         return 0;
2095
2096                 if (!spec_i_pt) {
2097                         /*
2098                          * Perform the Service Action REGISTER on the Initiator
2099                          * Port Endpoint that the PRO was received from on the
2100                          * Logical Unit of the SCSI device server.
2101                          */
2102                         if (core_scsi3_alloc_registration(cmd->se_dev,
2103                                         se_sess->se_node_acl, cmd->se_lun,
2104                                         NULL, cmd->orig_fe_lun, isid_ptr,
2105                                         sa_res_key, all_tg_pt, aptpl,
2106                                         register_type, 0)) {
2107                                 pr_err("Unable to allocate"
2108                                         " struct t10_pr_registration\n");
2109                                 return TCM_INVALID_PARAMETER_LIST;
2110                         }
2111                 } else {
2112                         /*
2113                          * Register both the Initiator port that received
2114                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2115                          * TransportID from Parameter list and loop through
2116                          * fabric dependent parameter list while calling
2117                          * logic from of core_scsi3_alloc_registration() for
2118                          * each TransportID provided SCSI Initiator Port/Device
2119                          */
2120                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2121                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2122                         if (ret != 0)
2123                                 return ret;
2124                 }
2125                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2126         }
2127
2128         /* ok, existing registration */
2129
2130         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2131                 pr_err("SPC-3 PR REGISTER: Received"
2132                        " res_key: 0x%016Lx does not match"
2133                        " existing SA REGISTER res_key:"
2134                        " 0x%016Lx\n", res_key,
2135                        pr_reg->pr_res_key);
2136                 ret = TCM_RESERVATION_CONFLICT;
2137                 goto out;
2138         }
2139
2140         if (spec_i_pt) {
2141                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2142                         " set on a registered nexus\n");
2143                 ret = TCM_INVALID_PARAMETER_LIST;
2144                 goto out;
2145         }
2146
2147         /*
2148          * An existing ALL_TG_PT=1 registration being released
2149          * must also set ALL_TG_PT=1 in the incoming PROUT.
2150          */
2151         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2152                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2153                         " registration exists, but ALL_TG_PT=1 bit not"
2154                         " present in received PROUT\n");
2155                 ret = TCM_INVALID_CDB_FIELD;
2156                 goto out;
2157         }
2158
2159         /*
2160          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2161          */
2162         if (sa_res_key) {
2163                 /*
2164                  * Increment PRgeneration counter for struct se_device"
2165                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2166                  * READ_KEYS service action.
2167                  */
2168                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2169                 pr_reg->pr_res_key = sa_res_key;
2170                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2171                          " Key for %s to: 0x%016Lx PRgeneration:"
2172                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2173                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2174                          pr_reg->pr_reg_nacl->initiatorname,
2175                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2176
2177         } else {
2178                 /*
2179                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2180                  */
2181                 type = pr_reg->pr_res_type;
2182                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2183                                                               pr_reg);
2184                 if (pr_holder < 0) {
2185                         ret = TCM_RESERVATION_CONFLICT;
2186                         goto out;
2187                 }
2188
2189                 spin_lock(&pr_tmpl->registration_lock);
2190                 /*
2191                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2192                  * and matching pr_res_key.
2193                  */
2194                 if (pr_reg->pr_reg_all_tg_pt) {
2195                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2196                                         &pr_tmpl->registration_list,
2197                                         pr_reg_list) {
2198
2199                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2200                                         continue;
2201                                 if (pr_reg_p->pr_res_key != res_key)
2202                                         continue;
2203                                 if (pr_reg == pr_reg_p)
2204                                         continue;
2205                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2206                                            pr_reg_p->pr_reg_nacl->initiatorname))
2207                                         continue;
2208
2209                                 __core_scsi3_free_registration(dev,
2210                                                 pr_reg_p, NULL, 0);
2211                         }
2212                 }
2213
2214                 /*
2215                  * Release the calling I_T Nexus registration now..
2216                  */
2217                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2218                 pr_reg = NULL;
2219
2220                 /*
2221                  * From spc4r17, section 5.7.11.3 Unregistering
2222                  *
2223                  * If the persistent reservation is a registrants only
2224                  * type, the device server shall establish a unit
2225                  * attention condition for the initiator port associated
2226                  * with every registered I_T nexus except for the I_T
2227                  * nexus on which the PERSISTENT RESERVE OUT command was
2228                  * received, with the additional sense code set to
2229                  * RESERVATIONS RELEASED.
2230                  */
2231                 if (pr_holder &&
2232                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2233                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2234                         list_for_each_entry(pr_reg_p,
2235                                         &pr_tmpl->registration_list,
2236                                         pr_reg_list) {
2237
2238                                 target_ua_allocate_lun(
2239                                         pr_reg_p->pr_reg_nacl,
2240                                         pr_reg_p->pr_res_mapped_lun,
2241                                         0x2A,
2242                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2243                         }
2244                 }
2245
2246                 spin_unlock(&pr_tmpl->registration_lock);
2247         }
2248
2249         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2250
2251 out:
2252         if (pr_reg)
2253                 core_scsi3_put_pr_reg(pr_reg);
2254         return ret;
2255 }
2256
2257 unsigned char *core_scsi3_pr_dump_type(int type)
2258 {
2259         switch (type) {
2260         case PR_TYPE_WRITE_EXCLUSIVE:
2261                 return "Write Exclusive Access";
2262         case PR_TYPE_EXCLUSIVE_ACCESS:
2263                 return "Exclusive Access";
2264         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2265                 return "Write Exclusive Access, Registrants Only";
2266         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2267                 return "Exclusive Access, Registrants Only";
2268         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2269                 return "Write Exclusive Access, All Registrants";
2270         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2271                 return "Exclusive Access, All Registrants";
2272         default:
2273                 break;
2274         }
2275
2276         return "Unknown SPC-3 PR Type";
2277 }
2278
2279 static sense_reason_t
2280 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2281 {
2282         struct se_device *dev = cmd->se_dev;
2283         struct se_session *se_sess = cmd->se_sess;
2284         struct se_lun *se_lun = cmd->se_lun;
2285         struct t10_pr_registration *pr_reg, *pr_res_holder;
2286         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2287         char i_buf[PR_REG_ISID_ID_LEN];
2288         sense_reason_t ret;
2289
2290         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2291
2292         if (!se_sess || !se_lun) {
2293                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2294                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2295         }
2296         /*
2297          * Locate the existing *pr_reg via struct se_node_acl pointers
2298          */
2299         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2300                                 se_sess);
2301         if (!pr_reg) {
2302                 pr_err("SPC-3 PR: Unable to locate"
2303                         " PR_REGISTERED *pr_reg for RESERVE\n");
2304                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2305         }
2306         /*
2307          * From spc4r17 Section 5.7.9: Reserving:
2308          *
2309          * An application client creates a persistent reservation by issuing
2310          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2311          * a registered I_T nexus with the following parameters:
2312          *    a) RESERVATION KEY set to the value of the reservation key that is
2313          *       registered with the logical unit for the I_T nexus; and
2314          */
2315         if (res_key != pr_reg->pr_res_key) {
2316                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2317                         " does not match existing SA REGISTER res_key:"
2318                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2319                 ret = TCM_RESERVATION_CONFLICT;
2320                 goto out_put_pr_reg;
2321         }
2322         /*
2323          * From spc4r17 Section 5.7.9: Reserving:
2324          *
2325          * From above:
2326          *  b) TYPE field and SCOPE field set to the persistent reservation
2327          *     being created.
2328          *
2329          * Only one persistent reservation is allowed at a time per logical unit
2330          * and that persistent reservation has a scope of LU_SCOPE.
2331          */
2332         if (scope != PR_SCOPE_LU_SCOPE) {
2333                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2334                 ret = TCM_INVALID_PARAMETER_LIST;
2335                 goto out_put_pr_reg;
2336         }
2337         /*
2338          * See if we have an existing PR reservation holder pointer at
2339          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2340          * *pr_res_holder.
2341          */
2342         spin_lock(&dev->dev_reservation_lock);
2343         pr_res_holder = dev->dev_pr_res_holder;
2344         if (pr_res_holder) {
2345                 /*
2346                  * From spc4r17 Section 5.7.9: Reserving:
2347                  *
2348                  * If the device server receives a PERSISTENT RESERVE OUT
2349                  * command from an I_T nexus other than a persistent reservation
2350                  * holder (see 5.7.10) that attempts to create a persistent
2351                  * reservation when a persistent reservation already exists for
2352                  * the logical unit, then the command shall be completed with
2353                  * RESERVATION CONFLICT status.
2354                  */
2355                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2356                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2357                         pr_err("SPC-3 PR: Attempted RESERVE from"
2358                                 " [%s]: %s while reservation already held by"
2359                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2360                                 cmd->se_tfo->get_fabric_name(),
2361                                 se_sess->se_node_acl->initiatorname,
2362                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2363                                 pr_res_holder->pr_reg_nacl->initiatorname);
2364
2365                         spin_unlock(&dev->dev_reservation_lock);
2366                         ret = TCM_RESERVATION_CONFLICT;
2367                         goto out_put_pr_reg;
2368                 }
2369                 /*
2370                  * From spc4r17 Section 5.7.9: Reserving:
2371                  *
2372                  * If a persistent reservation holder attempts to modify the
2373                  * type or scope of an existing persistent reservation, the
2374                  * command shall be completed with RESERVATION CONFLICT status.
2375                  */
2376                 if ((pr_res_holder->pr_res_type != type) ||
2377                     (pr_res_holder->pr_res_scope != scope)) {
2378                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2379                         pr_err("SPC-3 PR: Attempted RESERVE from"
2380                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2381                                 " while reservation already held by [%s]: %s,"
2382                                 " returning RESERVATION_CONFLICT\n",
2383                                 cmd->se_tfo->get_fabric_name(),
2384                                 se_sess->se_node_acl->initiatorname,
2385                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2386                                 pr_res_holder->pr_reg_nacl->initiatorname);
2387
2388                         spin_unlock(&dev->dev_reservation_lock);
2389                         ret = TCM_RESERVATION_CONFLICT;
2390                         goto out_put_pr_reg;
2391                 }
2392                 /*
2393                  * From spc4r17 Section 5.7.9: Reserving:
2394                  *
2395                  * If the device server receives a PERSISTENT RESERVE OUT
2396                  * command with RESERVE service action where the TYPE field and
2397                  * the SCOPE field contain the same values as the existing type
2398                  * and scope from a persistent reservation holder, it shall not
2399                  * make any change to the existing persistent reservation and
2400                  * shall completethe command with GOOD status.
2401                  */
2402                 spin_unlock(&dev->dev_reservation_lock);
2403                 ret = 0;
2404                 goto out_put_pr_reg;
2405         }
2406         /*
2407          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2408          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2409          */
2410         pr_reg->pr_res_scope = scope;
2411         pr_reg->pr_res_type = type;
2412         pr_reg->pr_res_holder = 1;
2413         dev->dev_pr_res_holder = pr_reg;
2414         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2415
2416         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2417                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2418                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2419                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2420         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2421                         cmd->se_tfo->get_fabric_name(),
2422                         se_sess->se_node_acl->initiatorname,
2423                         i_buf);
2424         spin_unlock(&dev->dev_reservation_lock);
2425
2426         if (pr_tmpl->pr_aptpl_active)
2427                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2428
2429         ret = 0;
2430 out_put_pr_reg:
2431         core_scsi3_put_pr_reg(pr_reg);
2432         return ret;
2433 }
2434
2435 static sense_reason_t
2436 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2437                 u64 res_key)
2438 {
2439         switch (type) {
2440         case PR_TYPE_WRITE_EXCLUSIVE:
2441         case PR_TYPE_EXCLUSIVE_ACCESS:
2442         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2443         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2444         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2445         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2446                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2447         default:
2448                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2449                         " 0x%02x\n", type);
2450                 return TCM_INVALID_CDB_FIELD;
2451         }
2452 }
2453
2454 /*
2455  * Called with struct se_device->dev_reservation_lock held.
2456  */
2457 static void __core_scsi3_complete_pro_release(
2458         struct se_device *dev,
2459         struct se_node_acl *se_nacl,
2460         struct t10_pr_registration *pr_reg,
2461         int explicit,
2462         int unreg)
2463 {
2464         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2465         char i_buf[PR_REG_ISID_ID_LEN];
2466         int pr_res_type = 0, pr_res_scope = 0;
2467
2468         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2469         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2470         /*
2471          * Go ahead and release the current PR reservation holder.
2472          * If an All Registrants reservation is currently active and
2473          * a unregister operation is requested, replace the current
2474          * dev_pr_res_holder with another active registration.
2475          */
2476         if (dev->dev_pr_res_holder) {
2477                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2478                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2479                 dev->dev_pr_res_holder->pr_res_type = 0;
2480                 dev->dev_pr_res_holder->pr_res_scope = 0;
2481                 dev->dev_pr_res_holder->pr_res_holder = 0;
2482                 dev->dev_pr_res_holder = NULL;
2483         }
2484         if (!unreg)
2485                 goto out;
2486
2487         spin_lock(&dev->t10_pr.registration_lock);
2488         list_del_init(&pr_reg->pr_reg_list);
2489         /*
2490          * If the I_T nexus is a reservation holder, the persistent reservation
2491          * is of an all registrants type, and the I_T nexus is the last remaining
2492          * registered I_T nexus, then the device server shall also release the
2493          * persistent reservation.
2494          */
2495         if (!list_empty(&dev->t10_pr.registration_list) &&
2496             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2497              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2498                 dev->dev_pr_res_holder =
2499                         list_entry(dev->t10_pr.registration_list.next,
2500                                    struct t10_pr_registration, pr_reg_list);
2501                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2502                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2503                 dev->dev_pr_res_holder->pr_res_holder = 1;
2504         }
2505         spin_unlock(&dev->t10_pr.registration_lock);
2506 out:
2507         if (!dev->dev_pr_res_holder) {
2508                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2509                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2510                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2511                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2512                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2513         }
2514         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2515                 tfo->get_fabric_name(), se_nacl->initiatorname,
2516                 i_buf);
2517         /*
2518          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2519          */
2520         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2521 }
2522
2523 static sense_reason_t
2524 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2525                 u64 res_key)
2526 {
2527         struct se_device *dev = cmd->se_dev;
2528         struct se_session *se_sess = cmd->se_sess;
2529         struct se_lun *se_lun = cmd->se_lun;
2530         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2531         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2532         sense_reason_t ret = 0;
2533
2534         if (!se_sess || !se_lun) {
2535                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2536                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2537         }
2538         /*
2539          * Locate the existing *pr_reg via struct se_node_acl pointers
2540          */
2541         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2542         if (!pr_reg) {
2543                 pr_err("SPC-3 PR: Unable to locate"
2544                         " PR_REGISTERED *pr_reg for RELEASE\n");
2545                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2546         }
2547         /*
2548          * From spc4r17 Section 5.7.11.2 Releasing:
2549          *
2550          * If there is no persistent reservation or in response to a persistent
2551          * reservation release request from a registered I_T nexus that is not a
2552          * persistent reservation holder (see 5.7.10), the device server shall
2553          * do the following:
2554          *
2555          *     a) Not release the persistent reservation, if any;
2556          *     b) Not remove any registrations; and
2557          *     c) Complete the command with GOOD status.
2558          */
2559         spin_lock(&dev->dev_reservation_lock);
2560         pr_res_holder = dev->dev_pr_res_holder;
2561         if (!pr_res_holder) {
2562                 /*
2563                  * No persistent reservation, return GOOD status.
2564                  */
2565                 spin_unlock(&dev->dev_reservation_lock);
2566                 goto out_put_pr_reg;
2567         }
2568
2569         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2570                 /*
2571                  * Release request from a registered I_T nexus that is not a
2572                  * persistent reservation holder. return GOOD status.
2573                  */
2574                 spin_unlock(&dev->dev_reservation_lock);
2575                 goto out_put_pr_reg;
2576         }
2577
2578         /*
2579          * From spc4r17 Section 5.7.11.2 Releasing:
2580          *
2581          * Only the persistent reservation holder (see 5.7.10) is allowed to
2582          * release a persistent reservation.
2583          *
2584          * An application client releases the persistent reservation by issuing
2585          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2586          * an I_T nexus that is a persistent reservation holder with the
2587          * following parameters:
2588          *
2589          *     a) RESERVATION KEY field set to the value of the reservation key
2590          *        that is registered with the logical unit for the I_T nexus;
2591          */
2592         if (res_key != pr_reg->pr_res_key) {
2593                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2594                         " does not match existing SA REGISTER res_key:"
2595                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2596                 spin_unlock(&dev->dev_reservation_lock);
2597                 ret = TCM_RESERVATION_CONFLICT;
2598                 goto out_put_pr_reg;
2599         }
2600         /*
2601          * From spc4r17 Section 5.7.11.2 Releasing and above:
2602          *
2603          * b) TYPE field and SCOPE field set to match the persistent
2604          *    reservation being released.
2605          */
2606         if ((pr_res_holder->pr_res_type != type) ||
2607             (pr_res_holder->pr_res_scope != scope)) {
2608                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2609                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2610                         " reservation from [%s]: %s with different TYPE "
2611                         "and/or SCOPE  while reservation already held by"
2612                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2613                         cmd->se_tfo->get_fabric_name(),
2614                         se_sess->se_node_acl->initiatorname,
2615                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2616                         pr_res_holder->pr_reg_nacl->initiatorname);
2617
2618                 spin_unlock(&dev->dev_reservation_lock);
2619                 ret = TCM_RESERVATION_CONFLICT;
2620                 goto out_put_pr_reg;
2621         }
2622         /*
2623          * In response to a persistent reservation release request from the
2624          * persistent reservation holder the device server shall perform a
2625          * release by doing the following as an uninterrupted series of actions:
2626          * a) Release the persistent reservation;
2627          * b) Not remove any registration(s);
2628          * c) If the released persistent reservation is a registrants only type
2629          * or all registrants type persistent reservation,
2630          *    the device server shall establish a unit attention condition for
2631          *    the initiator port associated with every regis-
2632          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2633          *    RESERVE OUT command with RELEASE service action was received,
2634          *    with the additional sense code set to RESERVATIONS RELEASED; and
2635          * d) If the persistent reservation is of any other type, the device
2636          *    server shall not establish a unit attention condition.
2637          */
2638         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2639                                           pr_reg, 1, 0);
2640
2641         spin_unlock(&dev->dev_reservation_lock);
2642
2643         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2644             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2645             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2646             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2647                 /*
2648                  * If no UNIT ATTENTION conditions will be established for
2649                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2650                  * go ahead and check for APTPL=1 update+write below
2651                  */
2652                 goto write_aptpl;
2653         }
2654
2655         spin_lock(&pr_tmpl->registration_lock);
2656         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2657                         pr_reg_list) {
2658                 /*
2659                  * Do not establish a UNIT ATTENTION condition
2660                  * for the calling I_T Nexus
2661                  */
2662                 if (pr_reg_p == pr_reg)
2663                         continue;
2664
2665                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2666                                 pr_reg_p->pr_res_mapped_lun,
2667                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2668         }
2669         spin_unlock(&pr_tmpl->registration_lock);
2670
2671 write_aptpl:
2672         if (pr_tmpl->pr_aptpl_active)
2673                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2674
2675 out_put_pr_reg:
2676         core_scsi3_put_pr_reg(pr_reg);
2677         return ret;
2678 }
2679
2680 static sense_reason_t
2681 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2682 {
2683         struct se_device *dev = cmd->se_dev;
2684         struct se_node_acl *pr_reg_nacl;
2685         struct se_session *se_sess = cmd->se_sess;
2686         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2687         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2688         u64 pr_res_mapped_lun = 0;
2689         int calling_it_nexus = 0;
2690         /*
2691          * Locate the existing *pr_reg via struct se_node_acl pointers
2692          */
2693         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2694                         se_sess->se_node_acl, se_sess);
2695         if (!pr_reg_n) {
2696                 pr_err("SPC-3 PR: Unable to locate"
2697                         " PR_REGISTERED *pr_reg for CLEAR\n");
2698                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2699         }
2700         /*
2701          * From spc4r17 section 5.7.11.6, Clearing:
2702          *
2703          * Any application client may release the persistent reservation and
2704          * remove all registrations from a device server by issuing a
2705          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2706          * registered I_T nexus with the following parameter:
2707          *
2708          *      a) RESERVATION KEY field set to the value of the reservation key
2709          *         that is registered with the logical unit for the I_T nexus.
2710          */
2711         if (res_key != pr_reg_n->pr_res_key) {
2712                 pr_err("SPC-3 PR REGISTER: Received"
2713                         " res_key: 0x%016Lx does not match"
2714                         " existing SA REGISTER res_key:"
2715                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2716                 core_scsi3_put_pr_reg(pr_reg_n);
2717                 return TCM_RESERVATION_CONFLICT;
2718         }
2719         /*
2720          * a) Release the persistent reservation, if any;
2721          */
2722         spin_lock(&dev->dev_reservation_lock);
2723         pr_res_holder = dev->dev_pr_res_holder;
2724         if (pr_res_holder) {
2725                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2726                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2727                                                   pr_res_holder, 0, 0);
2728         }
2729         spin_unlock(&dev->dev_reservation_lock);
2730         /*
2731          * b) Remove all registration(s) (see spc4r17 5.7.7);
2732          */
2733         spin_lock(&pr_tmpl->registration_lock);
2734         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2735                         &pr_tmpl->registration_list, pr_reg_list) {
2736
2737                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2738                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2739                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2740                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2741                                         calling_it_nexus);
2742                 /*
2743                  * e) Establish a unit attention condition for the initiator
2744                  *    port associated with every registered I_T nexus other
2745                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2746                  *    command with CLEAR service action was received, with the
2747                  *    additional sense code set to RESERVATIONS PREEMPTED.
2748                  */
2749                 if (!calling_it_nexus)
2750                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2751                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2752         }
2753         spin_unlock(&pr_tmpl->registration_lock);
2754
2755         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2756                 cmd->se_tfo->get_fabric_name());
2757
2758         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2759
2760         core_scsi3_pr_generation(dev);
2761         return 0;
2762 }
2763
2764 /*
2765  * Called with struct se_device->dev_reservation_lock held.
2766  */
2767 static void __core_scsi3_complete_pro_preempt(
2768         struct se_device *dev,
2769         struct t10_pr_registration *pr_reg,
2770         struct list_head *preempt_and_abort_list,
2771         int type,
2772         int scope,
2773         enum preempt_type preempt_type)
2774 {
2775         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2776         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2777         char i_buf[PR_REG_ISID_ID_LEN];
2778
2779         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2780         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2781         /*
2782          * Do an implicit RELEASE of the existing reservation.
2783          */
2784         if (dev->dev_pr_res_holder)
2785                 __core_scsi3_complete_pro_release(dev, nacl,
2786                                                   dev->dev_pr_res_holder, 0, 0);
2787
2788         dev->dev_pr_res_holder = pr_reg;
2789         pr_reg->pr_res_holder = 1;
2790         pr_reg->pr_res_type = type;
2791         pr_reg->pr_res_scope = scope;
2792
2793         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2794                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2795                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2796                 core_scsi3_pr_dump_type(type),
2797                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2798         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2799                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2800                 nacl->initiatorname, i_buf);
2801         /*
2802          * For PREEMPT_AND_ABORT, add the preempting reservation's
2803          * struct t10_pr_registration to the list that will be compared
2804          * against received CDBs..
2805          */
2806         if (preempt_and_abort_list)
2807                 list_add_tail(&pr_reg->pr_reg_abort_list,
2808                                 preempt_and_abort_list);
2809 }
2810
2811 static void core_scsi3_release_preempt_and_abort(
2812         struct list_head *preempt_and_abort_list,
2813         struct t10_pr_registration *pr_reg_holder)
2814 {
2815         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2816
2817         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2818                                 pr_reg_abort_list) {
2819
2820                 list_del(&pr_reg->pr_reg_abort_list);
2821                 if (pr_reg_holder == pr_reg)
2822                         continue;
2823                 if (pr_reg->pr_res_holder) {
2824                         pr_warn("pr_reg->pr_res_holder still set\n");
2825                         continue;
2826                 }
2827
2828                 pr_reg->pr_reg_deve = NULL;
2829                 pr_reg->pr_reg_nacl = NULL;
2830                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2831         }
2832 }
2833
2834 static sense_reason_t
2835 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2836                 u64 sa_res_key, enum preempt_type preempt_type)
2837 {
2838         struct se_device *dev = cmd->se_dev;
2839         struct se_node_acl *pr_reg_nacl;
2840         struct se_session *se_sess = cmd->se_sess;
2841         LIST_HEAD(preempt_and_abort_list);
2842         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2843         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2844         u64 pr_res_mapped_lun = 0;
2845         int all_reg = 0, calling_it_nexus = 0;
2846         bool sa_res_key_unmatched = sa_res_key != 0;
2847         int prh_type = 0, prh_scope = 0;
2848
2849         if (!se_sess)
2850                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2851
2852         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2853                                 se_sess);
2854         if (!pr_reg_n) {
2855                 pr_err("SPC-3 PR: Unable to locate"
2856                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2857                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2858                 return TCM_RESERVATION_CONFLICT;
2859         }
2860         if (pr_reg_n->pr_res_key != res_key) {
2861                 core_scsi3_put_pr_reg(pr_reg_n);
2862                 return TCM_RESERVATION_CONFLICT;
2863         }
2864         if (scope != PR_SCOPE_LU_SCOPE) {
2865                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2866                 core_scsi3_put_pr_reg(pr_reg_n);
2867                 return TCM_INVALID_PARAMETER_LIST;
2868         }
2869
2870         spin_lock(&dev->dev_reservation_lock);
2871         pr_res_holder = dev->dev_pr_res_holder;
2872         if (pr_res_holder &&
2873            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2874             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2875                 all_reg = 1;
2876
2877         if (!all_reg && !sa_res_key) {
2878                 spin_unlock(&dev->dev_reservation_lock);
2879                 core_scsi3_put_pr_reg(pr_reg_n);
2880                 return TCM_INVALID_PARAMETER_LIST;
2881         }
2882         /*
2883          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2884          *
2885          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2886          * persistent reservation holder or there is no persistent reservation
2887          * holder (i.e., there is no persistent reservation), then the device
2888          * server shall perform a preempt by doing the following in an
2889          * uninterrupted series of actions. (See below..)
2890          */
2891         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2892                 /*
2893                  * No existing or SA Reservation Key matching reservations..
2894                  *
2895                  * PROUT SA PREEMPT with All Registrant type reservations are
2896                  * allowed to be processed without a matching SA Reservation Key
2897                  */
2898                 spin_lock(&pr_tmpl->registration_lock);
2899                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2900                                 &pr_tmpl->registration_list, pr_reg_list) {
2901                         /*
2902                          * Removing of registrations in non all registrants
2903                          * type reservations without a matching SA reservation
2904                          * key.
2905                          *
2906                          * a) Remove the registrations for all I_T nexuses
2907                          *    specified by the SERVICE ACTION RESERVATION KEY
2908                          *    field;
2909                          * b) Ignore the contents of the SCOPE and TYPE fields;
2910                          * c) Process tasks as defined in 5.7.1; and
2911                          * d) Establish a unit attention condition for the
2912                          *    initiator port associated with every I_T nexus
2913                          *    that lost its registration other than the I_T
2914                          *    nexus on which the PERSISTENT RESERVE OUT command
2915                          *    was received, with the additional sense code set
2916                          *    to REGISTRATIONS PREEMPTED.
2917                          */
2918                         if (!all_reg) {
2919                                 if (pr_reg->pr_res_key != sa_res_key)
2920                                         continue;
2921                                 sa_res_key_unmatched = false;
2922
2923                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2924                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2925                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2926                                 __core_scsi3_free_registration(dev, pr_reg,
2927                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2928                                                 NULL, calling_it_nexus);
2929                         } else {
2930                                 /*
2931                                  * Case for any existing all registrants type
2932                                  * reservation, follow logic in spc4r17 section
2933                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2934                                  *
2935                                  * For a ZERO SA Reservation key, release
2936                                  * all other registrations and do an implicit
2937                                  * release of active persistent reservation.
2938                                  *
2939                                  * For a non-ZERO SA Reservation key, only
2940                                  * release the matching reservation key from
2941                                  * registrations.
2942                                  */
2943                                 if ((sa_res_key) &&
2944                                      (pr_reg->pr_res_key != sa_res_key))
2945                                         continue;
2946                                 sa_res_key_unmatched = false;
2947
2948                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2949                                 if (calling_it_nexus)
2950                                         continue;
2951
2952                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2953                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2954                                 __core_scsi3_free_registration(dev, pr_reg,
2955                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2956                                                 NULL, 0);
2957                         }
2958                         if (!calling_it_nexus)
2959                                 target_ua_allocate_lun(pr_reg_nacl,
2960                                         pr_res_mapped_lun, 0x2A,
2961                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2962                 }
2963                 spin_unlock(&pr_tmpl->registration_lock);
2964                 /*
2965                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2966                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2967                  * RESERVATION KEY field to a value that does not match any
2968                  * registered reservation key, then the device server shall
2969                  * complete the command with RESERVATION CONFLICT status.
2970                  */
2971                 if (sa_res_key_unmatched) {
2972                         spin_unlock(&dev->dev_reservation_lock);
2973                         core_scsi3_put_pr_reg(pr_reg_n);
2974                         return TCM_RESERVATION_CONFLICT;
2975                 }
2976                 /*
2977                  * For an existing all registrants type reservation
2978                  * with a zero SA rservation key, preempt the existing
2979                  * reservation with the new PR type and scope.
2980                  */
2981                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2982                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2983                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2984                                 type, scope, preempt_type);
2985
2986                         if (preempt_type == PREEMPT_AND_ABORT)
2987                                 core_scsi3_release_preempt_and_abort(
2988                                         &preempt_and_abort_list, pr_reg_n);
2989                 }
2990                 spin_unlock(&dev->dev_reservation_lock);
2991
2992                 if (pr_tmpl->pr_aptpl_active)
2993                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2994
2995                 core_scsi3_put_pr_reg(pr_reg_n);
2996                 core_scsi3_pr_generation(cmd->se_dev);
2997                 return 0;
2998         }
2999         /*
3000          * The PREEMPTing SA reservation key matches that of the
3001          * existing persistent reservation, first, we check if
3002          * we are preempting our own reservation.
3003          * From spc4r17, section 5.7.11.4.3 Preempting
3004          * persistent reservations and registration handling
3005          *
3006          * If an all registrants persistent reservation is not
3007          * present, it is not an error for the persistent
3008          * reservation holder to preempt itself (i.e., a
3009          * PERSISTENT RESERVE OUT with a PREEMPT service action
3010          * or a PREEMPT AND ABORT service action with the
3011          * SERVICE ACTION RESERVATION KEY value equal to the
3012          * persistent reservation holder's reservation key that
3013          * is received from the persistent reservation holder).
3014          * In that case, the device server shall establish the
3015          * new persistent reservation and maintain the
3016          * registration.
3017          */
3018         prh_type = pr_res_holder->pr_res_type;
3019         prh_scope = pr_res_holder->pr_res_scope;
3020         /*
3021          * If the SERVICE ACTION RESERVATION KEY field identifies a
3022          * persistent reservation holder (see 5.7.10), the device
3023          * server shall perform a preempt by doing the following as
3024          * an uninterrupted series of actions:
3025          *
3026          * a) Release the persistent reservation for the holder
3027          *    identified by the SERVICE ACTION RESERVATION KEY field;
3028          */
3029         if (pr_reg_n != pr_res_holder)
3030                 __core_scsi3_complete_pro_release(dev,
3031                                                   pr_res_holder->pr_reg_nacl,
3032                                                   dev->dev_pr_res_holder, 0, 0);
3033         /*
3034          * b) Remove the registrations for all I_T nexuses identified
3035          *    by the SERVICE ACTION RESERVATION KEY field, except the
3036          *    I_T nexus that is being used for the PERSISTENT RESERVE
3037          *    OUT command. If an all registrants persistent reservation
3038          *    is present and the SERVICE ACTION RESERVATION KEY field
3039          *    is set to zero, then all registrations shall be removed
3040          *    except for that of the I_T nexus that is being used for
3041          *    the PERSISTENT RESERVE OUT command;
3042          */
3043         spin_lock(&pr_tmpl->registration_lock);
3044         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3045                         &pr_tmpl->registration_list, pr_reg_list) {
3046
3047                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3048                 if (calling_it_nexus)
3049                         continue;
3050
3051                 if (pr_reg->pr_res_key != sa_res_key)
3052                         continue;
3053
3054                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3055                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3056                 __core_scsi3_free_registration(dev, pr_reg,
3057                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3058                                 calling_it_nexus);
3059                 /*
3060                  * e) Establish a unit attention condition for the initiator
3061                  *    port associated with every I_T nexus that lost its
3062                  *    persistent reservation and/or registration, with the
3063                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3064                  */
3065                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3066                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3067         }
3068         spin_unlock(&pr_tmpl->registration_lock);
3069         /*
3070          * c) Establish a persistent reservation for the preempting
3071          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3072          */
3073         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3074                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3075                         type, scope, preempt_type);
3076         /*
3077          * d) Process tasks as defined in 5.7.1;
3078          * e) See above..
3079          * f) If the type or scope has changed, then for every I_T nexus
3080          *    whose reservation key was not removed, except for the I_T
3081          *    nexus on which the PERSISTENT RESERVE OUT command was
3082          *    received, the device server shall establish a unit
3083          *    attention condition for the initiator port associated with
3084          *    that I_T nexus, with the additional sense code set to
3085          *    RESERVATIONS RELEASED. If the type or scope have not
3086          *    changed, then no unit attention condition(s) shall be
3087          *    established for this reason.
3088          */
3089         if ((prh_type != type) || (prh_scope != scope)) {
3090                 spin_lock(&pr_tmpl->registration_lock);
3091                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3092                                 &pr_tmpl->registration_list, pr_reg_list) {
3093
3094                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3095                         if (calling_it_nexus)
3096                                 continue;
3097
3098                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3099                                         pr_reg->pr_res_mapped_lun, 0x2A,
3100                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3101                 }
3102                 spin_unlock(&pr_tmpl->registration_lock);
3103         }
3104         spin_unlock(&dev->dev_reservation_lock);
3105         /*
3106          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3107          * All received CDBs for the matching existing reservation and
3108          * registrations undergo ABORT_TASK logic.
3109          *
3110          * From there, core_scsi3_release_preempt_and_abort() will
3111          * release every registration in the list (which have already
3112          * been removed from the primary pr_reg list), except the
3113          * new persistent reservation holder, the calling Initiator Port.
3114          */
3115         if (preempt_type == PREEMPT_AND_ABORT) {
3116                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3117                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3118                                                 pr_reg_n);
3119         }
3120
3121         if (pr_tmpl->pr_aptpl_active)
3122                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3123
3124         core_scsi3_put_pr_reg(pr_reg_n);
3125         core_scsi3_pr_generation(cmd->se_dev);
3126         return 0;
3127 }
3128
3129 static sense_reason_t
3130 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3131                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3132 {
3133         switch (type) {
3134         case PR_TYPE_WRITE_EXCLUSIVE:
3135         case PR_TYPE_EXCLUSIVE_ACCESS:
3136         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3137         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3138         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3139         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3140                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3141                                               sa_res_key, preempt_type);
3142         default:
3143                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3144                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3145                 return TCM_INVALID_CDB_FIELD;
3146         }
3147 }
3148
3149
3150 static sense_reason_t
3151 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3152                 u64 sa_res_key, int aptpl, int unreg)
3153 {
3154         struct se_session *se_sess = cmd->se_sess;
3155         struct se_device *dev = cmd->se_dev;
3156         struct se_dev_entry *dest_se_deve = NULL;
3157         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3158         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3159         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3160         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3161         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3162         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3163         unsigned char *buf;
3164         const unsigned char *initiator_str;
3165         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3166         u32 tid_len, tmp_tid_len;
3167         int new_reg = 0, type, scope, matching_iname;
3168         sense_reason_t ret;
3169         unsigned short rtpi;
3170         unsigned char proto_ident;
3171
3172         if (!se_sess || !se_lun) {
3173                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3174                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3175         }
3176
3177         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3178         se_tpg = se_sess->se_tpg;
3179         tf_ops = se_tpg->se_tpg_tfo;
3180         /*
3181          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3182          *      Register behaviors for a REGISTER AND MOVE service action
3183          *
3184          * Locate the existing *pr_reg via struct se_node_acl pointers
3185          */
3186         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3187                                 se_sess);
3188         if (!pr_reg) {
3189                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3190                         " *pr_reg for REGISTER_AND_MOVE\n");
3191                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3192         }
3193         /*
3194          * The provided reservation key much match the existing reservation key
3195          * provided during this initiator's I_T nexus registration.
3196          */
3197         if (res_key != pr_reg->pr_res_key) {
3198                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3199                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3200                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3201                 ret = TCM_RESERVATION_CONFLICT;
3202                 goto out_put_pr_reg;
3203         }
3204         /*
3205          * The service active reservation key needs to be non zero
3206          */
3207         if (!sa_res_key) {
3208                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3209                         " sa_res_key\n");
3210                 ret = TCM_INVALID_PARAMETER_LIST;
3211                 goto out_put_pr_reg;
3212         }
3213
3214         /*
3215          * Determine the Relative Target Port Identifier where the reservation
3216          * will be moved to for the TransportID containing SCSI initiator WWN
3217          * information.
3218          */
3219         buf = transport_kmap_data_sg(cmd);
3220         if (!buf) {
3221                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3222                 goto out_put_pr_reg;
3223         }
3224
3225         rtpi = (buf[18] & 0xff) << 8;
3226         rtpi |= buf[19] & 0xff;
3227         tid_len = (buf[20] & 0xff) << 24;
3228         tid_len |= (buf[21] & 0xff) << 16;
3229         tid_len |= (buf[22] & 0xff) << 8;
3230         tid_len |= buf[23] & 0xff;
3231         transport_kunmap_data_sg(cmd);
3232         buf = NULL;
3233
3234         if ((tid_len + 24) != cmd->data_length) {
3235                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3236                         " does not equal CDB data_length: %u\n", tid_len,
3237                         cmd->data_length);
3238                 ret = TCM_INVALID_PARAMETER_LIST;
3239                 goto out_put_pr_reg;
3240         }
3241
3242         spin_lock(&dev->se_port_lock);
3243         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3244                 if (tmp_lun->lun_rtpi != rtpi)
3245                         continue;
3246                 dest_se_tpg = tmp_lun->lun_tpg;
3247                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3248                 if (!dest_tf_ops)
3249                         continue;
3250
3251                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3252                 spin_unlock(&dev->se_port_lock);
3253
3254                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3255                         pr_err("core_scsi3_tpg_depend_item() failed"
3256                                 " for dest_se_tpg\n");
3257                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3258                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3259                         goto out_put_pr_reg;
3260                 }
3261
3262                 spin_lock(&dev->se_port_lock);
3263                 break;
3264         }
3265         spin_unlock(&dev->se_port_lock);
3266
3267         if (!dest_se_tpg || !dest_tf_ops) {
3268                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3269                         " fabric ops from Relative Target Port Identifier:"
3270                         " %hu\n", rtpi);
3271                 ret = TCM_INVALID_PARAMETER_LIST;
3272                 goto out_put_pr_reg;
3273         }
3274
3275         buf = transport_kmap_data_sg(cmd);
3276         if (!buf) {
3277                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3278                 goto out_put_pr_reg;
3279         }
3280         proto_ident = (buf[24] & 0x0f);
3281
3282         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3283                         " 0x%02x\n", proto_ident);
3284
3285         if (proto_ident != dest_se_tpg->proto_id) {
3286                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3287                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3288                         " from fabric: %s\n", proto_ident,
3289                         dest_se_tpg->proto_id,
3290                         dest_tf_ops->get_fabric_name());
3291                 ret = TCM_INVALID_PARAMETER_LIST;
3292                 goto out;
3293         }
3294         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3295                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3296         if (!initiator_str) {
3297                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3298                         " initiator_str from Transport ID\n");
3299                 ret = TCM_INVALID_PARAMETER_LIST;
3300                 goto out;
3301         }
3302
3303         transport_kunmap_data_sg(cmd);
3304         buf = NULL;
3305
3306         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3307                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3308                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3309                 iport_ptr : "");
3310         /*
3311          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3312          * action specifies a TransportID that is the same as the initiator port
3313          * of the I_T nexus for the command received, then the command shall
3314          * be terminated with CHECK CONDITION status, with the sense key set to
3315          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3316          * IN PARAMETER LIST.
3317          */
3318         pr_reg_nacl = pr_reg->pr_reg_nacl;
3319         matching_iname = (!strcmp(initiator_str,
3320                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3321         if (!matching_iname)
3322                 goto after_iport_check;
3323
3324         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3325                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3326                         " matches: %s on received I_T Nexus\n", initiator_str,
3327                         pr_reg_nacl->initiatorname);
3328                 ret = TCM_INVALID_PARAMETER_LIST;
3329                 goto out;
3330         }
3331         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3332                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3333                         " matches: %s %s on received I_T Nexus\n",
3334                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3335                         pr_reg->pr_reg_isid);
3336                 ret = TCM_INVALID_PARAMETER_LIST;
3337                 goto out;
3338         }
3339 after_iport_check:
3340         /*
3341          * Locate the destination struct se_node_acl from the received Transport ID
3342          */
3343         mutex_lock(&dest_se_tpg->acl_node_mutex);
3344         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3345                                 initiator_str);
3346         if (dest_node_acl)
3347                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3348         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3349
3350         if (!dest_node_acl) {
3351                 pr_err("Unable to locate %s dest_node_acl for"
3352                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3353                         initiator_str);
3354                 ret = TCM_INVALID_PARAMETER_LIST;
3355                 goto out;
3356         }
3357
3358         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3359                 pr_err("core_scsi3_nodeacl_depend_item() for"
3360                         " dest_node_acl\n");
3361                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3362                 dest_node_acl = NULL;
3363                 ret = TCM_INVALID_PARAMETER_LIST;
3364                 goto out;
3365         }
3366
3367         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3368                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3369                 dest_node_acl->initiatorname);
3370
3371         /*
3372          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3373          * PORT IDENTIFIER.
3374          */
3375         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3376         if (!dest_se_deve) {
3377                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3378                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3379                 ret = TCM_INVALID_PARAMETER_LIST;
3380                 goto out;
3381         }
3382
3383         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3384                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3385                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3386                 dest_se_deve = NULL;
3387                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3388                 goto out;
3389         }
3390
3391         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3392                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3393                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3394                 dest_se_deve->mapped_lun);
3395
3396         /*
3397          * A persistent reservation needs to already existing in order to
3398          * successfully complete the REGISTER_AND_MOVE service action..
3399          */
3400         spin_lock(&dev->dev_reservation_lock);
3401         pr_res_holder = dev->dev_pr_res_holder;
3402         if (!pr_res_holder) {
3403                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3404                         " currently held\n");
3405                 spin_unlock(&dev->dev_reservation_lock);
3406                 ret = TCM_INVALID_CDB_FIELD;
3407                 goto out;
3408         }
3409         /*
3410          * The received on I_T Nexus must be the reservation holder.
3411          *
3412          * From spc4r17 section 5.7.8  Table 50 --
3413          *      Register behaviors for a REGISTER AND MOVE service action
3414          */
3415         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3416                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3417                         " Nexus is not reservation holder\n");
3418                 spin_unlock(&dev->dev_reservation_lock);
3419                 ret = TCM_RESERVATION_CONFLICT;
3420                 goto out;
3421         }
3422         /*
3423          * From spc4r17 section 5.7.8: registering and moving reservation
3424          *
3425          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3426          * action is received and the established persistent reservation is a
3427          * Write Exclusive - All Registrants type or Exclusive Access -
3428          * All Registrants type reservation, then the command shall be completed
3429          * with RESERVATION CONFLICT status.
3430          */
3431         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3432             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3433                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3434                         " reservation for type: %s\n",
3435                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3436                 spin_unlock(&dev->dev_reservation_lock);
3437                 ret = TCM_RESERVATION_CONFLICT;
3438                 goto out;
3439         }
3440         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3441         /*
3442          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3443          */
3444         type = pr_res_holder->pr_res_type;
3445         scope = pr_res_holder->pr_res_type;
3446         /*
3447          * c) Associate the reservation key specified in the SERVICE ACTION
3448          *    RESERVATION KEY field with the I_T nexus specified as the
3449          *    destination of the register and move, where:
3450          *    A) The I_T nexus is specified by the TransportID and the
3451          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3452          *    B) Regardless of the TransportID format used, the association for
3453          *       the initiator port is based on either the initiator port name
3454          *       (see 3.1.71) on SCSI transport protocols where port names are
3455          *       required or the initiator port identifier (see 3.1.70) on SCSI
3456          *       transport protocols where port names are not required;
3457          * d) Register the reservation key specified in the SERVICE ACTION
3458          *    RESERVATION KEY field;
3459          * e) Retain the reservation key specified in the SERVICE ACTION
3460          *    RESERVATION KEY field and associated information;
3461          *
3462          * Also, It is not an error for a REGISTER AND MOVE service action to
3463          * register an I_T nexus that is already registered with the same
3464          * reservation key or a different reservation key.
3465          */
3466         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3467                                         iport_ptr);
3468         if (!dest_pr_reg) {
3469                 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3470                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
3471
3472                 spin_unlock(&dev->dev_reservation_lock);
3473                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3474                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3475                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3476                         ret = TCM_INVALID_PARAMETER_LIST;
3477                         goto out;
3478                 }
3479                 spin_lock(&dev->dev_reservation_lock);
3480                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3481                                                 iport_ptr);
3482                 new_reg = 1;
3483         }
3484         /*
3485          * f) Release the persistent reservation for the persistent reservation
3486          *    holder (i.e., the I_T nexus on which the
3487          */
3488         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3489                                           dev->dev_pr_res_holder, 0, 0);
3490         /*
3491          * g) Move the persistent reservation to the specified I_T nexus using
3492          *    the same scope and type as the persistent reservation released in
3493          *    item f); and
3494          */
3495         dev->dev_pr_res_holder = dest_pr_reg;
3496         dest_pr_reg->pr_res_holder = 1;
3497         dest_pr_reg->pr_res_type = type;
3498         pr_reg->pr_res_scope = scope;
3499         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3500         /*
3501          * Increment PRGeneration for existing registrations..
3502          */
3503         if (!new_reg)
3504                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3505         spin_unlock(&dev->dev_reservation_lock);
3506
3507         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3508                 " created new reservation holder TYPE: %s on object RTPI:"
3509                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3510                 core_scsi3_pr_dump_type(type), rtpi,
3511                 dest_pr_reg->pr_res_generation);
3512         pr_debug("SPC-3 PR Successfully moved reservation from"
3513                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3514                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3515                 i_buf, dest_tf_ops->get_fabric_name(),
3516                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3517                 iport_ptr : "");
3518         /*
3519          * It is now safe to release configfs group dependencies for destination
3520          * of Transport ID Initiator Device/Port Identifier
3521          */
3522         core_scsi3_lunacl_undepend_item(dest_se_deve);
3523         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3524         core_scsi3_tpg_undepend_item(dest_se_tpg);
3525         /*
3526          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3527          * nexus on which PERSISTENT RESERVE OUT command was received.
3528          */
3529         if (unreg) {
3530                 spin_lock(&pr_tmpl->registration_lock);
3531                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3532                 spin_unlock(&pr_tmpl->registration_lock);
3533         } else
3534                 core_scsi3_put_pr_reg(pr_reg);
3535
3536         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3537
3538         transport_kunmap_data_sg(cmd);
3539
3540         core_scsi3_put_pr_reg(dest_pr_reg);
3541         return 0;
3542 out:
3543         if (buf)
3544                 transport_kunmap_data_sg(cmd);
3545         if (dest_se_deve)
3546                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3547         if (dest_node_acl)
3548                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3549         core_scsi3_tpg_undepend_item(dest_se_tpg);
3550
3551 out_put_pr_reg:
3552         core_scsi3_put_pr_reg(pr_reg);
3553         return ret;
3554 }
3555
3556 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3557 {
3558         unsigned int __v1, __v2;
3559
3560         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3561         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3562
3563         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3564 }
3565
3566 /*
3567  * See spc4r17 section 6.14 Table 170
3568  */
3569 sense_reason_t
3570 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3571 {
3572         struct se_device *dev = cmd->se_dev;
3573         unsigned char *cdb = &cmd->t_task_cdb[0];
3574         unsigned char *buf;
3575         u64 res_key, sa_res_key;
3576         int sa, scope, type, aptpl;
3577         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3578         sense_reason_t ret;
3579
3580         /*
3581          * Following spc2r20 5.5.1 Reservations overview:
3582          *
3583          * If a logical unit has been reserved by any RESERVE command and is
3584          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3585          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3586          * initiator or service action and shall terminate with a RESERVATION
3587          * CONFLICT status.
3588          */
3589         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3590                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3591                         " SPC-2 reservation is held, returning"
3592                         " RESERVATION_CONFLICT\n");
3593                 return TCM_RESERVATION_CONFLICT;
3594         }
3595
3596         /*
3597          * FIXME: A NULL struct se_session pointer means an this is not coming from
3598          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3599          */
3600         if (!cmd->se_sess)
3601                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3602
3603         if (cmd->data_length < 24) {
3604                 pr_warn("SPC-PR: Received PR OUT parameter list"
3605                         " length too small: %u\n", cmd->data_length);
3606                 return TCM_INVALID_PARAMETER_LIST;
3607         }
3608
3609         /*
3610          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3611          */
3612         sa = (cdb[1] & 0x1f);
3613         scope = (cdb[2] & 0xf0);
3614         type = (cdb[2] & 0x0f);
3615
3616         buf = transport_kmap_data_sg(cmd);
3617         if (!buf)
3618                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3619
3620         /*
3621          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3622          */
3623         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3624         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3625         /*
3626          * REGISTER_AND_MOVE uses a different SA parameter list containing
3627          * SCSI TransportIDs.
3628          */
3629         if (sa != PRO_REGISTER_AND_MOVE) {
3630                 spec_i_pt = (buf[20] & 0x08);
3631                 all_tg_pt = (buf[20] & 0x04);
3632                 aptpl = (buf[20] & 0x01);
3633         } else {
3634                 aptpl = (buf[17] & 0x01);
3635                 unreg = (buf[17] & 0x02);
3636         }
3637         /*
3638          * If the backend device has been configured to force APTPL metadata
3639          * write-out, go ahead and propigate aptpl=1 down now.
3640          */
3641         if (dev->dev_attrib.force_pr_aptpl)
3642                 aptpl = 1;
3643
3644         transport_kunmap_data_sg(cmd);
3645         buf = NULL;
3646
3647         /*
3648          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3649          */
3650         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3651                 return TCM_INVALID_PARAMETER_LIST;
3652
3653         /*
3654          * From spc4r17 section 6.14:
3655          *
3656          * If the SPEC_I_PT bit is set to zero, the service action is not
3657          * REGISTER AND MOVE, and the parameter list length is not 24, then
3658          * the command shall be terminated with CHECK CONDITION status, with
3659          * the sense key set to ILLEGAL REQUEST, and the additional sense
3660          * code set to PARAMETER LIST LENGTH ERROR.
3661          */
3662         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3663             (cmd->data_length != 24)) {
3664                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3665                         " list length: %u\n", cmd->data_length);
3666                 return TCM_INVALID_PARAMETER_LIST;
3667         }
3668
3669         /*
3670          * (core_scsi3_emulate_pro_* function parameters
3671          * are defined by spc4r17 Table 174:
3672          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3673          */
3674         switch (sa) {
3675         case PRO_REGISTER:
3676                 ret = core_scsi3_emulate_pro_register(cmd,
3677                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3678                 break;
3679         case PRO_RESERVE:
3680                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3681                 break;
3682         case PRO_RELEASE:
3683                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3684                 break;
3685         case PRO_CLEAR:
3686                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3687                 break;
3688         case PRO_PREEMPT:
3689                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3690                                         res_key, sa_res_key, PREEMPT);
3691                 break;
3692         case PRO_PREEMPT_AND_ABORT:
3693                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3694                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3695                 break;
3696         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3697                 ret = core_scsi3_emulate_pro_register(cmd,
3698                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3699                 break;
3700         case PRO_REGISTER_AND_MOVE:
3701                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3702                                 sa_res_key, aptpl, unreg);
3703                 break;
3704         default:
3705                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3706                         " action: 0x%02x\n", cdb[1] & 0x1f);
3707                 return TCM_INVALID_CDB_FIELD;
3708         }
3709
3710         if (!ret)
3711                 target_complete_cmd(cmd, GOOD);
3712         return ret;
3713 }
3714
3715 /*
3716  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3717  *
3718  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3719  */
3720 static sense_reason_t
3721 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3722 {
3723         struct se_device *dev = cmd->se_dev;
3724         struct t10_pr_registration *pr_reg;
3725         unsigned char *buf;
3726         u32 add_len = 0, off = 8;
3727
3728         if (cmd->data_length < 8) {
3729                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3730                         " too small\n", cmd->data_length);
3731                 return TCM_INVALID_CDB_FIELD;
3732         }
3733
3734         buf = transport_kmap_data_sg(cmd);
3735         if (!buf)
3736                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3737
3738         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3739         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3740         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3741         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3742
3743         spin_lock(&dev->t10_pr.registration_lock);
3744         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3745                         pr_reg_list) {
3746                 /*
3747                  * Check for overflow of 8byte PRI READ_KEYS payload and
3748                  * next reservation key list descriptor.
3749                  */
3750                 if ((add_len + 8) > (cmd->data_length - 8))
3751                         break;
3752
3753                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3754                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3755                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3756                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3757                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3758                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3759                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3760                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3761
3762                 add_len += 8;
3763         }
3764         spin_unlock(&dev->t10_pr.registration_lock);
3765
3766         buf[4] = ((add_len >> 24) & 0xff);
3767         buf[5] = ((add_len >> 16) & 0xff);
3768         buf[6] = ((add_len >> 8) & 0xff);
3769         buf[7] = (add_len & 0xff);
3770
3771         transport_kunmap_data_sg(cmd);
3772
3773         return 0;
3774 }
3775
3776 /*
3777  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3778  *
3779  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3780  */
3781 static sense_reason_t
3782 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3783 {
3784         struct se_device *dev = cmd->se_dev;
3785         struct t10_pr_registration *pr_reg;
3786         unsigned char *buf;
3787         u64 pr_res_key;
3788         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3789
3790         if (cmd->data_length < 8) {
3791                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3792                         " too small\n", cmd->data_length);
3793                 return TCM_INVALID_CDB_FIELD;
3794         }
3795
3796         buf = transport_kmap_data_sg(cmd);
3797         if (!buf)
3798                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3799
3800         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3801         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3802         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3803         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3804
3805         spin_lock(&dev->dev_reservation_lock);
3806         pr_reg = dev->dev_pr_res_holder;
3807         if (pr_reg) {
3808                 /*
3809                  * Set the hardcoded Additional Length
3810                  */
3811                 buf[4] = ((add_len >> 24) & 0xff);
3812                 buf[5] = ((add_len >> 16) & 0xff);
3813                 buf[6] = ((add_len >> 8) & 0xff);
3814                 buf[7] = (add_len & 0xff);
3815
3816                 if (cmd->data_length < 22)
3817                         goto err;
3818
3819                 /*
3820                  * Set the Reservation key.
3821                  *
3822                  * From spc4r17, section 5.7.10:
3823                  * A persistent reservation holder has its reservation key
3824                  * returned in the parameter data from a PERSISTENT
3825                  * RESERVE IN command with READ RESERVATION service action as
3826                  * follows:
3827                  * a) For a persistent reservation of the type Write Exclusive
3828                  *    - All Registrants or Exclusive Access  All Regitrants,
3829                  *      the reservation key shall be set to zero; or
3830                  * b) For all other persistent reservation types, the
3831                  *    reservation key shall be set to the registered
3832                  *    reservation key for the I_T nexus that holds the
3833                  *    persistent reservation.
3834                  */
3835                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3836                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3837                         pr_res_key = 0;
3838                 else
3839                         pr_res_key = pr_reg->pr_res_key;
3840
3841                 buf[8] = ((pr_res_key >> 56) & 0xff);
3842                 buf[9] = ((pr_res_key >> 48) & 0xff);
3843                 buf[10] = ((pr_res_key >> 40) & 0xff);
3844                 buf[11] = ((pr_res_key >> 32) & 0xff);
3845                 buf[12] = ((pr_res_key >> 24) & 0xff);
3846                 buf[13] = ((pr_res_key >> 16) & 0xff);
3847                 buf[14] = ((pr_res_key >> 8) & 0xff);
3848                 buf[15] = (pr_res_key & 0xff);
3849                 /*
3850                  * Set the SCOPE and TYPE
3851                  */
3852                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3853                           (pr_reg->pr_res_type & 0x0f);
3854         }
3855
3856 err:
3857         spin_unlock(&dev->dev_reservation_lock);
3858         transport_kunmap_data_sg(cmd);
3859
3860         return 0;
3861 }
3862
3863 /*
3864  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3865  *
3866  * See spc4r17 section 6.13.4 Table 165
3867  */
3868 static sense_reason_t
3869 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3870 {
3871         struct se_device *dev = cmd->se_dev;
3872         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3873         unsigned char *buf;
3874         u16 add_len = 8; /* Hardcoded to 8. */
3875
3876         if (cmd->data_length < 6) {
3877                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3878                         " %u too small\n", cmd->data_length);
3879                 return TCM_INVALID_CDB_FIELD;
3880         }
3881
3882         buf = transport_kmap_data_sg(cmd);
3883         if (!buf)
3884                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3885
3886         buf[0] = ((add_len >> 8) & 0xff);
3887         buf[1] = (add_len & 0xff);
3888         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3889         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3890         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3891         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3892         /*
3893          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3894          * set the TMV: Task Mask Valid bit.
3895          */
3896         buf[3] |= 0x80;
3897         /*
3898          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3899          */
3900         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3901         /*
3902          * PTPL_A: Persistence across Target Power Loss Active bit
3903          */
3904         if (pr_tmpl->pr_aptpl_active)
3905                 buf[3] |= 0x01;
3906         /*
3907          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3908          */
3909         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3910         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3911         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3912         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3913         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3914         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3915
3916         transport_kunmap_data_sg(cmd);
3917
3918         return 0;
3919 }
3920
3921 /*
3922  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3923  *
3924  * See spc4r17 section 6.13.5 Table 168 and 169
3925  */
3926 static sense_reason_t
3927 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3928 {
3929         struct se_device *dev = cmd->se_dev;
3930         struct se_node_acl *se_nacl;
3931         struct se_portal_group *se_tpg;
3932         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3933         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3934         unsigned char *buf;
3935         u32 add_desc_len = 0, add_len = 0;
3936         u32 off = 8; /* off into first Full Status descriptor */
3937         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3938         int exp_desc_len, desc_len;
3939         bool all_reg = false;
3940
3941         if (cmd->data_length < 8) {
3942                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3943                         " too small\n", cmd->data_length);
3944                 return TCM_INVALID_CDB_FIELD;
3945         }
3946
3947         buf = transport_kmap_data_sg(cmd);
3948         if (!buf)
3949                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3950
3951         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3952         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3953         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3954         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3955
3956         spin_lock(&dev->dev_reservation_lock);
3957         if (dev->dev_pr_res_holder) {
3958                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3959
3960                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3961                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3962                         all_reg = true;
3963                         pr_res_type = pr_holder->pr_res_type;
3964                         pr_res_scope = pr_holder->pr_res_scope;
3965                 }
3966         }
3967         spin_unlock(&dev->dev_reservation_lock);
3968
3969         spin_lock(&pr_tmpl->registration_lock);
3970         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3971                         &pr_tmpl->registration_list, pr_reg_list) {
3972
3973                 se_nacl = pr_reg->pr_reg_nacl;
3974                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3975                 add_desc_len = 0;
3976
3977                 atomic_inc_mb(&pr_reg->pr_res_holders);
3978                 spin_unlock(&pr_tmpl->registration_lock);
3979                 /*
3980                  * Determine expected length of $FABRIC_MOD specific
3981                  * TransportID full status descriptor..
3982                  */
3983                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3984                                         &format_code);
3985                 if (exp_desc_len < 0 ||
3986                     exp_desc_len + add_len > cmd->data_length) {
3987                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3988                                 " out of buffer: %d\n", cmd->data_length);
3989                         spin_lock(&pr_tmpl->registration_lock);
3990                         atomic_dec_mb(&pr_reg->pr_res_holders);
3991                         break;
3992                 }
3993                 /*
3994                  * Set RESERVATION KEY
3995                  */
3996                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3997                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3998                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3999                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4000                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4001                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4002                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4003                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4004                 off += 4; /* Skip Over Reserved area */
4005
4006                 /*
4007                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4008                  */
4009                 if (pr_reg->pr_reg_all_tg_pt)
4010                         buf[off] = 0x02;
4011                 /*
4012                  * The struct se_lun pointer will be present for the
4013                  * reservation holder for PR_HOLDER bit.
4014                  *
4015                  * Also, if this registration is the reservation
4016                  * holder or there is an All Registrants reservation
4017                  * active, fill in SCOPE and TYPE in the next byte.
4018                  */
4019                 if (pr_reg->pr_res_holder) {
4020                         buf[off++] |= 0x01;
4021                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4022                                      (pr_reg->pr_res_type & 0x0f);
4023                 } else if (all_reg) {
4024                         buf[off++] |= 0x01;
4025                         buf[off++] = (pr_res_scope & 0xf0) |
4026                                      (pr_res_type & 0x0f);
4027                 } else {
4028                         off += 2;
4029                 }
4030
4031                 off += 4; /* Skip over reserved area */
4032                 /*
4033                  * From spc4r17 6.3.15:
4034                  *
4035                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4036                  * IDENTIFIER field contains the relative port identifier (see
4037                  * 3.1.120) of the target port that is part of the I_T nexus
4038                  * described by this full status descriptor. If the ALL_TG_PT
4039                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4040                  * IDENTIFIER field are not defined by this standard.
4041                  */
4042                 if (!pr_reg->pr_reg_all_tg_pt) {
4043                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
4044
4045                         buf[off++] = ((sep_rtpi >> 8) & 0xff);
4046                         buf[off++] = (sep_rtpi & 0xff);
4047                 } else
4048                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4049
4050                 buf[off+4] = se_tpg->proto_id;
4051
4052                 /*
4053                  * Now, have the $FABRIC_MOD fill in the transport ID.
4054                  */
4055                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4056                                 &format_code, &buf[off+4]);
4057
4058                 spin_lock(&pr_tmpl->registration_lock);
4059                 atomic_dec_mb(&pr_reg->pr_res_holders);
4060
4061                 if (desc_len < 0)
4062                         break;
4063                 /*
4064                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4065                  */
4066                 buf[off++] = ((desc_len >> 24) & 0xff);
4067                 buf[off++] = ((desc_len >> 16) & 0xff);
4068                 buf[off++] = ((desc_len >> 8) & 0xff);
4069                 buf[off++] = (desc_len & 0xff);
4070                 /*
4071                  * Size of full desctipor header minus TransportID
4072                  * containing $FABRIC_MOD specific) initiator device/port
4073                  * WWN information.
4074                  *
4075                  *  See spc4r17 Section 6.13.5 Table 169
4076                  */
4077                 add_desc_len = (24 + desc_len);
4078
4079                 off += desc_len;
4080                 add_len += add_desc_len;
4081         }
4082         spin_unlock(&pr_tmpl->registration_lock);
4083         /*
4084          * Set ADDITIONAL_LENGTH
4085          */
4086         buf[4] = ((add_len >> 24) & 0xff);
4087         buf[5] = ((add_len >> 16) & 0xff);
4088         buf[6] = ((add_len >> 8) & 0xff);
4089         buf[7] = (add_len & 0xff);
4090
4091         transport_kunmap_data_sg(cmd);
4092
4093         return 0;
4094 }
4095
4096 sense_reason_t
4097 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4098 {
4099         sense_reason_t ret;
4100
4101         /*
4102          * Following spc2r20 5.5.1 Reservations overview:
4103          *
4104          * If a logical unit has been reserved by any RESERVE command and is
4105          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4106          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4107          * initiator or service action and shall terminate with a RESERVATION
4108          * CONFLICT status.
4109          */
4110         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4111                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4112                         " SPC-2 reservation is held, returning"
4113                         " RESERVATION_CONFLICT\n");
4114                 return TCM_RESERVATION_CONFLICT;
4115         }
4116
4117         switch (cmd->t_task_cdb[1] & 0x1f) {
4118         case PRI_READ_KEYS:
4119                 ret = core_scsi3_pri_read_keys(cmd);
4120                 break;
4121         case PRI_READ_RESERVATION:
4122                 ret = core_scsi3_pri_read_reservation(cmd);
4123                 break;
4124         case PRI_REPORT_CAPABILITIES:
4125                 ret = core_scsi3_pri_report_capabilities(cmd);
4126                 break;
4127         case PRI_READ_FULL_STATUS:
4128                 ret = core_scsi3_pri_read_full_status(cmd);
4129                 break;
4130         default:
4131                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4132                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4133                 return TCM_INVALID_CDB_FIELD;
4134         }
4135
4136         if (!ret)
4137                 target_complete_cmd(cmd, GOOD);
4138         return ret;
4139 }
4140
4141 sense_reason_t
4142 target_check_reservation(struct se_cmd *cmd)
4143 {
4144         struct se_device *dev = cmd->se_dev;
4145         sense_reason_t ret;
4146
4147         if (!cmd->se_sess)
4148                 return 0;
4149         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4150                 return 0;
4151         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
4152                 return 0;
4153
4154         spin_lock(&dev->dev_reservation_lock);
4155         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4156                 ret = target_scsi2_reservation_check(cmd);
4157         else
4158                 ret = target_scsi3_pr_reservation_check(cmd);
4159         spin_unlock(&dev->dev_reservation_lock);
4160
4161         return ret;
4162 }