drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * (c) Copyright 2009-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/file.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38
  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
  62         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  63 }
  64
  65 enum register_type {
  66         REGISTER,
  67         REGISTER_AND_IGNORE_EXISTING_KEY,
  68         REGISTER_AND_MOVE,
  69 };
  70
  71 enum preempt_type {
  72         PREEMPT,
  73         PREEMPT_AND_ABORT,
  74 };
  75
  76 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  77                                               struct t10_pr_registration *, int, int);
  78
  79 static int is_reservation_holder(
  80         struct t10_pr_registration *pr_res_holder,
  81         struct t10_pr_registration *pr_reg)
  82 {
  83         int pr_res_type;
  84
  85         if (pr_res_holder) {
  86                 pr_res_type = pr_res_holder->pr_res_type;
  87
  88                 return pr_res_holder == pr_reg ||
  89                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  90                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  91         }
  92         return 0;
  93 }
  94
  95 static sense_reason_t
  96 target_scsi2_reservation_check(struct se_cmd *cmd)
  97 {
  98         struct se_device *dev = cmd->se_dev;
  99         struct se_session *sess = cmd->se_sess;
 100
 101         switch (cmd->t_task_cdb[0]) {
 102         case INQUIRY:
 103         case RELEASE:
 104         case RELEASE_10:
 105                 return 0;
 106         default:
 107                 break;
 108         }
 109
 110         if (!dev->dev_reserved_node_acl || !sess)
 111                 return 0;
 112
 113         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 114                 return TCM_RESERVATION_CONFLICT;
 115
 116         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 117                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 118                         return TCM_RESERVATION_CONFLICT;
 119         }
 120
 121         return 0;
 122 }
 123
 124 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 125                                         struct se_node_acl *, struct se_session *);
 126 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 127
 128 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 129 {
 130         struct se_session *se_sess = cmd->se_sess;
 131         struct se_device *dev = cmd->se_dev;
 132         struct t10_pr_registration *pr_reg;
 133         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 134         int conflict = 0;
 135
 136         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 137                         se_sess);
 138         if (pr_reg) {
 139                 /*
 140                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 141                  * behavior
 142                  *
 143                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 144                  * status, but no reservation shall be established and the
 145                  * persistent reservation shall not be changed, if the command
 146                  * is received from a) and b) below.
 147                  *
 148                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 149                  * status, but the persistent reservation shall not be released,
 150                  * if the command is received from a) and b)
 151                  *
 152                  * a) An I_T nexus that is a persistent reservation holder; or
 153                  * b) An I_T nexus that is registered if a registrants only or
 154                  *    all registrants type persistent reservation is present.
 155                  *
 156                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 157                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 158                  * as defined in SPC-2.
 159                  */
 160                 if (pr_reg->pr_res_holder) {
 161                         core_scsi3_put_pr_reg(pr_reg);
 162                         return 1;
 163                 }
 164                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 165                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 166                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 168                         core_scsi3_put_pr_reg(pr_reg);
 169                         return 1;
 170                 }
 171                 core_scsi3_put_pr_reg(pr_reg);
 172                 conflict = 1;
 173         } else {
 174                 /*
 175                  * Following spc2r20 5.5.1 Reservations overview:
 176                  *
 177                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 178                  * command with the REGISTER or the REGISTER AND IGNORE
 179                  * EXISTING KEY service action and is still registered by any
 180                  * initiator, all RESERVE commands and all RELEASE commands
 181                  * regardless of initiator shall conflict and shall terminate
 182                  * with a RESERVATION CONFLICT status.
 183                  */
 184                 spin_lock(&pr_tmpl->registration_lock);
 185                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 186                 spin_unlock(&pr_tmpl->registration_lock);
 187         }
 188
 189         if (conflict) {
 190                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 191                         " while active SPC-3 registrations exist,"
 192                         " returning RESERVATION_CONFLICT\n");
 193                 return -EBUSY;
 194         }
 195
 196         return 0;
 197 }
 198
 199 sense_reason_t
 200 target_scsi2_reservation_release(struct se_cmd *cmd)
 201 {
 202         struct se_device *dev = cmd->se_dev;
 203         struct se_session *sess = cmd->se_sess;
 204         struct se_portal_group *tpg;
 205         int rc;
 206
 207         if (!sess || !sess->se_tpg)
 208                 goto out;
 209         rc = target_check_scsi2_reservation_conflict(cmd);
 210         if (rc == 1)
 211                 goto out;
 212         if (rc < 0)
 213                 return TCM_RESERVATION_CONFLICT;
 214
 215         spin_lock(&dev->dev_reservation_lock);
 216         if (!dev->dev_reserved_node_acl || !sess)
 217                 goto out_unlock;
 218
 219         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 220                 goto out_unlock;
 221
 222         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 223                 goto out_unlock;
 224
 225         dev->dev_reserved_node_acl = NULL;
 226         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 227         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 228                 dev->dev_res_bin_isid = 0;
 229                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 230         }
 231         tpg = sess->se_tpg;
 232         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 233                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 234                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 235                 sess->se_node_acl->initiatorname);
 236
 237 out_unlock:
 238         spin_unlock(&dev->dev_reservation_lock);
 239 out:
 240         target_complete_cmd(cmd, GOOD);
 241         return 0;
 242 }
 243
 244 sense_reason_t
 245 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 246 {
 247         struct se_device *dev = cmd->se_dev;
 248         struct se_session *sess = cmd->se_sess;
 249         struct se_portal_group *tpg;
 250         sense_reason_t ret = 0;
 251         int rc;
 252
 253         if ((cmd->t_task_cdb[1] & 0x01) &&
 254             (cmd->t_task_cdb[1] & 0x02)) {
 255                 pr_err("LongIO and Obselete Bits set, returning"
 256                                 " ILLEGAL_REQUEST\n");
 257                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 258         }
 259         /*
 260          * This is currently the case for target_core_mod passthrough struct se_cmd
 261          * ops
 262          */
 263         if (!sess || !sess->se_tpg)
 264                 goto out;
 265         rc = target_check_scsi2_reservation_conflict(cmd);
 266         if (rc == 1)
 267                 goto out;
 268
 269         if (rc < 0)
 270                 return TCM_RESERVATION_CONFLICT;
 271
 272         tpg = sess->se_tpg;
 273         spin_lock(&dev->dev_reservation_lock);
 274         if (dev->dev_reserved_node_acl &&
 275            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 276                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 277                         tpg->se_tpg_tfo->get_fabric_name());
 278                 pr_err("Original reserver LUN: %u %s\n",
 279                         cmd->se_lun->unpacked_lun,
 280                         dev->dev_reserved_node_acl->initiatorname);
 281                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 282                         " from %s \n", cmd->se_lun->unpacked_lun,
 283                         cmd->orig_fe_lun,
 284                         sess->se_node_acl->initiatorname);
 285                 ret = TCM_RESERVATION_CONFLICT;
 286                 goto out_unlock;
 287         }
 288
 289         dev->dev_reserved_node_acl = sess->se_node_acl;
 290         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 291         if (sess->sess_bin_isid != 0) {
 292                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 293                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 294         }
 295         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 296                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 297                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 298                 sess->se_node_acl->initiatorname);
 299
 300 out_unlock:
 301         spin_unlock(&dev->dev_reservation_lock);
 302 out:
 303         if (!ret)
 304                 target_complete_cmd(cmd, GOOD);
 305         return ret;
 306 }
 307
 308
 309 /*
 310  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 311  *
 312  * This function is called by those initiator ports who are *NOT*
 313  * the active PR reservation holder when a reservation is present.
 314  */
 315 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 316                                         bool isid_mismatch)
 317 {
 318         unsigned char *cdb = cmd->t_task_cdb;
 319         struct se_session *se_sess = cmd->se_sess;
 320         struct se_node_acl *nacl = se_sess->se_node_acl;
 321         int other_cdb = 0;
 322         int registered_nexus = 0, ret = 1; /* Conflict by default */
 323         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 324         int we = 0; /* Write Exclusive */
 325         int legacy = 0; /* Act like a legacy device and return
 326                          * RESERVATION CONFLICT on some CDBs */
 327
 328         if (isid_mismatch) {
 329                 registered_nexus = 0;
 330         } else {
 331                 struct se_dev_entry *se_deve;
 332
 333                 rcu_read_lock();
 334                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 335                 if (se_deve)
 336                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 337                                                     &se_deve->deve_flags);
 338                 rcu_read_unlock();
 339         }
 340
 341         switch (pr_reg_type) {
 342         case PR_TYPE_WRITE_EXCLUSIVE:
 343                 we = 1;
 344         case PR_TYPE_EXCLUSIVE_ACCESS:
 345                 /*
 346                  * Some commands are only allowed for the persistent reservation
 347                  * holder.
 348                  */
 349                 break;
 350         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 351                 we = 1;
 352         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 353                 /*
 354                  * Some commands are only allowed for registered I_T Nexuses.
 355                  */
 356                 reg_only = 1;
 357                 break;
 358         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 359                 we = 1;
 360         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 361                 /*
 362                  * Each registered I_T Nexus is a reservation holder.
 363                  */
 364                 all_reg = 1;
 365                 break;
 366         default:
 367                 return -EINVAL;
 368         }
 369         /*
 370          * Referenced from spc4r17 table 45 for *NON* PR holder access
 371          */
 372         switch (cdb[0]) {
 373         case SECURITY_PROTOCOL_IN:
 374                 if (registered_nexus)
 375                         return 0;
 376                 ret = (we) ? 0 : 1;
 377                 break;
 378         case MODE_SENSE:
 379         case MODE_SENSE_10:
 380         case READ_ATTRIBUTE:
 381         case READ_BUFFER:
 382         case RECEIVE_DIAGNOSTIC:
 383                 if (legacy) {
 384                         ret = 1;
 385                         break;
 386                 }
 387                 if (registered_nexus) {
 388                         ret = 0;
 389                         break;
 390                 }
 391                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 392                 break;
 393         case PERSISTENT_RESERVE_OUT:
 394                 /*
 395                  * This follows PERSISTENT_RESERVE_OUT service actions that
 396                  * are allowed in the presence of various reservations.
 397                  * See spc4r17, table 46
 398                  */
 399                 switch (cdb[1] & 0x1f) {
 400                 case PRO_CLEAR:
 401                 case PRO_PREEMPT:
 402                 case PRO_PREEMPT_AND_ABORT:
 403                         ret = (registered_nexus) ? 0 : 1;
 404                         break;
 405                 case PRO_REGISTER:
 406                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 407                         ret = 0;
 408                         break;
 409                 case PRO_REGISTER_AND_MOVE:
 410                 case PRO_RESERVE:
 411                         ret = 1;
 412                         break;
 413                 case PRO_RELEASE:
 414                         ret = (registered_nexus) ? 0 : 1;
 415                         break;
 416                 default:
 417                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 418                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 419                         return -EINVAL;
 420                 }
 421                 break;
 422         case RELEASE:
 423         case RELEASE_10:
 424                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 425                 ret = 0;
 426                 break;
 427         case RESERVE:
 428         case RESERVE_10:
 429                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 430                 ret = 0;
 431                 break;
 432         case TEST_UNIT_READY:
 433                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 434                 break;
 435         case MAINTENANCE_IN:
 436                 switch (cdb[1] & 0x1f) {
 437                 case MI_MANAGEMENT_PROTOCOL_IN:
 438                         if (registered_nexus) {
 439                                 ret = 0;
 440                                 break;
 441                         }
 442                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 443                         break;
 444                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 445                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 446                         if (legacy) {
 447                                 ret = 1;
 448                                 break;
 449                         }
 450                         if (registered_nexus) {
 451                                 ret = 0;
 452                                 break;
 453                         }
 454                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 455                         break;
 456                 case MI_REPORT_ALIASES:
 457                 case MI_REPORT_IDENTIFYING_INFORMATION:
 458                 case MI_REPORT_PRIORITY:
 459                 case MI_REPORT_TARGET_PGS:
 460                 case MI_REPORT_TIMESTAMP:
 461                         ret = 0; /* Allowed */
 462                         break;
 463                 default:
 464                         pr_err("Unknown MI Service Action: 0x%02x\n",
 465                                 (cdb[1] & 0x1f));
 466                         return -EINVAL;
 467                 }
 468                 break;
 469         case ACCESS_CONTROL_IN:
 470         case ACCESS_CONTROL_OUT:
 471         case INQUIRY:
 472         case LOG_SENSE:
 473         case SERVICE_ACTION_IN_12:
 474         case REPORT_LUNS:
 475         case REQUEST_SENSE:
 476         case PERSISTENT_RESERVE_IN:
 477                 ret = 0; /*/ Allowed CDBs */
 478                 break;
 479         default:
 480                 other_cdb = 1;
 481                 break;
 482         }
 483         /*
 484          * Case where the CDB is explicitly allowed in the above switch
 485          * statement.
 486          */
 487         if (!ret && !other_cdb) {
 488                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 489                         " reservation holder\n", cdb[0],
 490                         core_scsi3_pr_dump_type(pr_reg_type));
 491
 492                 return ret;
 493         }
 494         /*
 495          * Check if write exclusive initiator ports *NOT* holding the
 496          * WRITE_EXCLUSIVE_* reservation.
 497          */
 498         if (we && !registered_nexus) {
 499                 if (cmd->data_direction == DMA_TO_DEVICE) {
 500                         /*
 501                          * Conflict for write exclusive
 502                          */
 503                         pr_debug("%s Conflict for unregistered nexus"
 504                                 " %s CDB: 0x%02x to %s reservation\n",
 505                                 transport_dump_cmd_direction(cmd),
 506                                 se_sess->se_node_acl->initiatorname, cdb[0],
 507                                 core_scsi3_pr_dump_type(pr_reg_type));
 508                         return 1;
 509                 } else {
 510                         /*
 511                          * Allow non WRITE CDBs for all Write Exclusive
 512                          * PR TYPEs to pass for registered and
 513                          * non-registered_nexuxes NOT holding the reservation.
 514                          *
 515                          * We only make noise for the unregisterd nexuses,
 516                          * as we expect registered non-reservation holding
 517                          * nexuses to issue CDBs.
 518                          */
 519
 520                         if (!registered_nexus) {
 521                                 pr_debug("Allowing implicit CDB: 0x%02x"
 522                                         " for %s reservation on unregistered"
 523                                         " nexus\n", cdb[0],
 524                                         core_scsi3_pr_dump_type(pr_reg_type));
 525                         }
 526
 527                         return 0;
 528                 }
 529         } else if ((reg_only) || (all_reg)) {
 530                 if (registered_nexus) {
 531                         /*
 532                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 533                          * allow commands from registered nexuses.
 534                          */
 535
 536                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 537                                 " reservation\n", cdb[0],
 538                                 core_scsi3_pr_dump_type(pr_reg_type));
 539
 540                         return 0;
 541                 }
 542        } else if (we && registered_nexus) {
 543                /*
 544                 * Reads are allowed for Write Exclusive locks
 545                 * from all registrants.
 546                 */
 547                if (cmd->data_direction == DMA_FROM_DEVICE) {
 548                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 549                                " reservation\n", cdb[0],
 550                                core_scsi3_pr_dump_type(pr_reg_type));
 551
 552                        return 0;
 553                }
 554         }
 555         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 556                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 557                 (registered_nexus) ? "" : "un",
 558                 se_sess->se_node_acl->initiatorname, cdb[0],
 559                 core_scsi3_pr_dump_type(pr_reg_type));
 560
 561         return 1; /* Conflict by default */
 562 }
 563
 564 static sense_reason_t
 565 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 566 {
 567         struct se_device *dev = cmd->se_dev;
 568         struct se_session *sess = cmd->se_sess;
 569         u32 pr_reg_type;
 570         bool isid_mismatch = false;
 571
 572         if (!dev->dev_pr_res_holder)
 573                 return 0;
 574
 575         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 576         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 577         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 578                 goto check_nonholder;
 579
 580         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 581                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 582                     sess->sess_bin_isid) {
 583                         isid_mismatch = true;
 584                         goto check_nonholder;
 585                 }
 586         }
 587
 588         return 0;
 589
 590 check_nonholder:
 591         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 592                 return TCM_RESERVATION_CONFLICT;
 593         return 0;
 594 }
 595
 596 static u32 core_scsi3_pr_generation(struct se_device *dev)
 597 {
 598         u32 prg;
 599
 600         /*
 601          * PRGeneration field shall contain the value of a 32-bit wrapping
 602          * counter mainted by the device server.
 603          *
 604          * Note that this is done regardless of Active Persist across
 605          * Target PowerLoss (APTPL)
 606          *
 607          * See spc4r17 section 6.3.12 READ_KEYS service action
 608          */
 609         spin_lock(&dev->dev_reservation_lock);
 610         prg = dev->t10_pr.pr_generation++;
 611         spin_unlock(&dev->dev_reservation_lock);
 612
 613         return prg;
 614 }
 615
 616 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 617         struct se_device *dev,
 618         struct se_node_acl *nacl,
 619         struct se_lun *lun,
 620         struct se_dev_entry *deve,
 621         u32 mapped_lun,
 622         unsigned char *isid,
 623         u64 sa_res_key,
 624         int all_tg_pt,
 625         int aptpl)
 626 {
 627         struct t10_pr_registration *pr_reg;
 628
 629         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 630         if (!pr_reg) {
 631                 pr_err("Unable to allocate struct t10_pr_registration\n");
 632                 return NULL;
 633         }
 634
 635         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 636         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 637         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 640         atomic_set(&pr_reg->pr_res_holders, 0);
 641         pr_reg->pr_reg_nacl = nacl;
 642         pr_reg->pr_reg_deve = deve;
 643         pr_reg->pr_res_mapped_lun = mapped_lun;
 644         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 645         pr_reg->tg_pt_sep_rtpi = lun->lun_sep->sep_rtpi;
 646         pr_reg->pr_res_key = sa_res_key;
 647         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 648         pr_reg->pr_reg_aptpl = aptpl;
 649         /*
 650          * If an ISID value for this SCSI Initiator Port exists,
 651          * save it to the registration now.
 652          */
 653         if (isid != NULL) {
 654                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 655                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 656                 pr_reg->isid_present_at_reg = 1;
 657         }
 658
 659         return pr_reg;
 660 }
 661
 662 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 663 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 664
 665 /*
 666  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 667  * modes.
 668  */
 669 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 670         struct se_device *dev,
 671         struct se_node_acl *nacl,
 672         struct se_lun *lun,
 673         struct se_dev_entry *deve,
 674         u32 mapped_lun,
 675         unsigned char *isid,
 676         u64 sa_res_key,
 677         int all_tg_pt,
 678         int aptpl)
 679 {
 680         struct se_dev_entry *deve_tmp;
 681         struct se_node_acl *nacl_tmp;
 682         struct se_lun_acl *lacl_tmp;
 683         struct se_lun *lun_tmp;
 684         struct se_port *port, *port_tmp;
 685         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 686         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 687         int ret;
 688         /*
 689          * Create a registration for the I_T Nexus upon which the
 690          * PROUT REGISTER was received.
 691          */
 692         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 693                                                     isid, sa_res_key, all_tg_pt,
 694                                                     aptpl);
 695         if (!pr_reg)
 696                 return NULL;
 697         /*
 698          * Return pointer to pr_reg for ALL_TG_PT=0
 699          */
 700         if (!all_tg_pt)
 701                 return pr_reg;
 702         /*
 703          * Create list of matching SCSI Initiator Port registrations
 704          * for ALL_TG_PT=1
 705          */
 706         spin_lock(&dev->se_port_lock);
 707         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 708                 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
 709                 spin_unlock(&dev->se_port_lock);
 710
 711                 spin_lock_bh(&port->sep_alua_lock);
 712                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 713                                         alua_port_list) {
 714                         /*
 715                          * This pointer will be NULL for demo mode MappedLUNs
 716                          * that have not been make explicit via a ConfigFS
 717                          * MappedLUN group for the SCSI Initiator Node ACL.
 718                          */
 719                         if (!deve_tmp->se_lun_acl)
 720                                 continue;
 721
 722                         lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
 723                                                 lockdep_is_held(&port->sep_alua_lock));
 724                         nacl_tmp = lacl_tmp->se_lun_nacl;
 725                         /*
 726                          * Skip the matching struct se_node_acl that is allocated
 727                          * above..
 728                          */
 729                         if (nacl == nacl_tmp)
 730                                 continue;
 731                         /*
 732                          * Only perform PR registrations for target ports on
 733                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 734                          * arrived.
 735                          */
 736                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 737                                 continue;
 738                         /*
 739                          * Look for a matching Initiator Node ACL in ASCII format
 740                          */
 741                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 742                                 continue;
 743
 744                         kref_get(&deve_tmp->pr_kref);
 745                         spin_unlock_bh(&port->sep_alua_lock);
 746                         /*
 747                          * Grab a configfs group dependency that is released
 748                          * for the exception path at label out: below, or upon
 749                          * completion of adding ALL_TG_PT=1 registrations in
 750                          * __core_scsi3_add_registration()
 751                          */
 752                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 753                         if (ret < 0) {
 754                                 pr_err("core_scsi3_lunacl_depend"
 755                                                 "_item() failed\n");
 756                                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 757                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 758                                 goto out;
 759                         }
 760                         /*
 761                          * Located a matching SCSI Initiator Port on a different
 762                          * port, allocate the pr_reg_atp and attach it to the
 763                          * pr_reg->pr_reg_atp_list that will be processed once
 764                          * the original *pr_reg is processed in
 765                          * __core_scsi3_add_registration()
 766                          */
 767                         lun_tmp = rcu_dereference_check(deve_tmp->se_lun,
 768                                 atomic_read(&deve_tmp->pr_kref.refcount) != 0);
 769
 770                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 771                                                 nacl_tmp, lun_tmp, deve_tmp,
 772                                                 deve_tmp->mapped_lun, NULL,
 773                                                 sa_res_key, all_tg_pt, aptpl);
 774                         if (!pr_reg_atp) {
 775                                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 776                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 777                                 goto out;
 778                         }
 779
 780                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 781                                       &pr_reg->pr_reg_atp_list);
 782                         spin_lock_bh(&port->sep_alua_lock);
 783                 }
 784                 spin_unlock_bh(&port->sep_alua_lock);
 785
 786                 spin_lock(&dev->se_port_lock);
 787                 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
 788         }
 789         spin_unlock(&dev->se_port_lock);
 790
 791         return pr_reg;
 792 out:
 793         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 794                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 795                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 796                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 797                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 798         }
 799         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 800         return NULL;
 801 }
 802
 803 int core_scsi3_alloc_aptpl_registration(
 804         struct t10_reservation *pr_tmpl,
 805         u64 sa_res_key,
 806         unsigned char *i_port,
 807         unsigned char *isid,
 808         u32 mapped_lun,
 809         unsigned char *t_port,
 810         u16 tpgt,
 811         u32 target_lun,
 812         int res_holder,
 813         int all_tg_pt,
 814         u8 type)
 815 {
 816         struct t10_pr_registration *pr_reg;
 817
 818         if (!i_port || !t_port || !sa_res_key) {
 819                 pr_err("Illegal parameters for APTPL registration\n");
 820                 return -EINVAL;
 821         }
 822
 823         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 824         if (!pr_reg) {
 825                 pr_err("Unable to allocate struct t10_pr_registration\n");
 826                 return -ENOMEM;
 827         }
 828
 829         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 830         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 831         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 832         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 833         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 834         atomic_set(&pr_reg->pr_res_holders, 0);
 835         pr_reg->pr_reg_nacl = NULL;
 836         pr_reg->pr_reg_deve = NULL;
 837         pr_reg->pr_res_mapped_lun = mapped_lun;
 838         pr_reg->pr_aptpl_target_lun = target_lun;
 839         pr_reg->pr_res_key = sa_res_key;
 840         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 841         pr_reg->pr_reg_aptpl = 1;
 842         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 843         pr_reg->pr_res_type = type;
 844         /*
 845          * If an ISID value had been saved in APTPL metadata for this
 846          * SCSI Initiator Port, restore it now.
 847          */
 848         if (isid != NULL) {
 849                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 850                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 851                 pr_reg->isid_present_at_reg = 1;
 852         }
 853         /*
 854          * Copy the i_port and t_port information from caller.
 855          */
 856         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 857         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 858         pr_reg->pr_reg_tpgt = tpgt;
 859         /*
 860          * Set pr_res_holder from caller, the pr_reg who is the reservation
 861          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 862          * the Initiator Node LUN ACL from the fabric module is created for
 863          * this registration.
 864          */
 865         pr_reg->pr_res_holder = res_holder;
 866
 867         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 868         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 869                         " metadata\n", (res_holder) ? "+reservation" : "");
 870         return 0;
 871 }
 872
 873 static void core_scsi3_aptpl_reserve(
 874         struct se_device *dev,
 875         struct se_portal_group *tpg,
 876         struct se_node_acl *node_acl,
 877         struct t10_pr_registration *pr_reg)
 878 {
 879         char i_buf[PR_REG_ISID_ID_LEN];
 880
 881         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 882         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 883
 884         spin_lock(&dev->dev_reservation_lock);
 885         dev->dev_pr_res_holder = pr_reg;
 886         spin_unlock(&dev->dev_reservation_lock);
 887
 888         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 889                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 890                 tpg->se_tpg_tfo->get_fabric_name(),
 891                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 892                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 893         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 894                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 895                 i_buf);
 896 }
 897
 898 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 899                                 struct t10_pr_registration *, enum register_type, int);
 900
 901 static int __core_scsi3_check_aptpl_registration(
 902         struct se_device *dev,
 903         struct se_portal_group *tpg,
 904         struct se_lun *lun,
 905         u32 target_lun,
 906         struct se_node_acl *nacl,
 907         u32 mapped_lun)
 908 {
 909         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 910         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 911         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 912         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 913         u16 tpgt;
 914
 915         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 916         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 917         /*
 918          * Copy Initiator Port information from struct se_node_acl
 919          */
 920         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 921         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 922                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 923         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 924         /*
 925          * Look for the matching registrations+reservation from those
 926          * created from APTPL metadata.  Note that multiple registrations
 927          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 928          * TransportIDs.
 929          */
 930         spin_lock(&pr_tmpl->aptpl_reg_lock);
 931         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 932                                 pr_reg_aptpl_list) {
 933
 934                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 935                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 936                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 937                      (pr_reg->pr_reg_tpgt == tpgt) &&
 938                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 939
 940                         pr_reg->pr_reg_nacl = nacl;
 941                         pr_reg->tg_pt_sep_rtpi = lun->lun_sep->sep_rtpi;
 942
 943                         list_del(&pr_reg->pr_reg_aptpl_list);
 944                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 945                         /*
 946                          * At this point all of the pointers in *pr_reg will
 947                          * be setup, so go ahead and add the registration.
 948                          */
 949
 950                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 951                         /*
 952                          * If this registration is the reservation holder,
 953                          * make that happen now..
 954                          */
 955                         if (pr_reg->pr_res_holder)
 956                                 core_scsi3_aptpl_reserve(dev, tpg,
 957                                                 nacl, pr_reg);
 958                         /*
 959                          * Reenable pr_aptpl_active to accept new metadata
 960                          * updates once the SCSI device is active again..
 961                          */
 962                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 963                         pr_tmpl->pr_aptpl_active = 1;
 964                 }
 965         }
 966         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 967
 968         return 0;
 969 }
 970
 971 int core_scsi3_check_aptpl_registration(
 972         struct se_device *dev,
 973         struct se_portal_group *tpg,
 974         struct se_lun *lun,
 975         struct se_node_acl *nacl,
 976         u32 mapped_lun)
 977 {
 978         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
 979                 return 0;
 980
 981         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 982                                                      lun->unpacked_lun, nacl,
 983                                                      mapped_lun);
 984 }
 985
 986 static void __core_scsi3_dump_registration(
 987         const struct target_core_fabric_ops *tfo,
 988         struct se_device *dev,
 989         struct se_node_acl *nacl,
 990         struct t10_pr_registration *pr_reg,
 991         enum register_type register_type)
 992 {
 993         struct se_portal_group *se_tpg = nacl->se_tpg;
 994         char i_buf[PR_REG_ISID_ID_LEN];
 995
 996         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
 997         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 998
 999         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1000                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1001                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1002                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1003                 i_buf);
1004         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1005                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1006                 tfo->tpg_get_tag(se_tpg));
1007         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1008                 " Port(s)\n",  tfo->get_fabric_name(),
1009                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1010                 dev->transport->name);
1011         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1012                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1013                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1014                 pr_reg->pr_reg_aptpl);
1015 }
1016
1017 static void __core_scsi3_add_registration(
1018         struct se_device *dev,
1019         struct se_node_acl *nacl,
1020         struct t10_pr_registration *pr_reg,
1021         enum register_type register_type,
1022         int register_move)
1023 {
1024         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1025         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1026         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1027         struct se_dev_entry *deve;
1028
1029         /*
1030          * Increment PRgeneration counter for struct se_device upon a successful
1031          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1032          *
1033          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1034          * action, the struct se_device->dev_reservation_lock will already be held,
1035          * so we do not call core_scsi3_pr_generation() which grabs the lock
1036          * for the REGISTER.
1037          */
1038         pr_reg->pr_res_generation = (register_move) ?
1039                         dev->t10_pr.pr_generation++ :
1040                         core_scsi3_pr_generation(dev);
1041
1042         spin_lock(&pr_tmpl->registration_lock);
1043         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1044
1045         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1046         spin_unlock(&pr_tmpl->registration_lock);
1047
1048         rcu_read_lock();
1049         deve = pr_reg->pr_reg_deve;
1050         if (deve)
1051                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1052         rcu_read_unlock();
1053
1054         /*
1055          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1056          */
1057         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1058                 return;
1059         /*
1060          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1061          * allocated in __core_scsi3_alloc_registration()
1062          */
1063         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1064                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1065                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1066
1067                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1068
1069                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1070
1071                 spin_lock(&pr_tmpl->registration_lock);
1072                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1073                               &pr_tmpl->registration_list);
1074
1075                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1076                                                register_type);
1077                 spin_unlock(&pr_tmpl->registration_lock);
1078
1079                 rcu_read_lock();
1080                 deve = pr_reg_tmp->pr_reg_deve;
1081                 if (deve)
1082                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1083                 rcu_read_unlock();
1084
1085                 /*
1086                  * Drop configfs group dependency reference from
1087                  * __core_scsi3_alloc_registration()
1088                  */
1089                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1090         }
1091 }
1092
1093 static int core_scsi3_alloc_registration(
1094         struct se_device *dev,
1095         struct se_node_acl *nacl,
1096         struct se_lun *lun,
1097         struct se_dev_entry *deve,
1098         u32 mapped_lun,
1099         unsigned char *isid,
1100         u64 sa_res_key,
1101         int all_tg_pt,
1102         int aptpl,
1103         enum register_type register_type,
1104         int register_move)
1105 {
1106         struct t10_pr_registration *pr_reg;
1107
1108         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1109                                                  isid, sa_res_key, all_tg_pt,
1110                                                  aptpl);
1111         if (!pr_reg)
1112                 return -EPERM;
1113
1114         __core_scsi3_add_registration(dev, nacl, pr_reg,
1115                         register_type, register_move);
1116         return 0;
1117 }
1118
1119 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1120         struct se_device *dev,
1121         struct se_node_acl *nacl,
1122         unsigned char *isid)
1123 {
1124         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1125         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1126         struct se_portal_group *tpg;
1127
1128         spin_lock(&pr_tmpl->registration_lock);
1129         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1130                         &pr_tmpl->registration_list, pr_reg_list) {
1131                 /*
1132                  * First look for a matching struct se_node_acl
1133                  */
1134                 if (pr_reg->pr_reg_nacl != nacl)
1135                         continue;
1136
1137                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1138                 /*
1139                  * If this registration does NOT contain a fabric provided
1140                  * ISID, then we have found a match.
1141                  */
1142                 if (!pr_reg->isid_present_at_reg) {
1143                         /*
1144                          * Determine if this SCSI device server requires that
1145                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1146                          * for fabric modules (iSCSI) requiring them.
1147                          */
1148                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1149                                 if (dev->dev_attrib.enforce_pr_isids)
1150                                         continue;
1151                         }
1152                         atomic_inc_mb(&pr_reg->pr_res_holders);
1153                         spin_unlock(&pr_tmpl->registration_lock);
1154                         return pr_reg;
1155                 }
1156                 /*
1157                  * If the *pr_reg contains a fabric defined ISID for multi-value
1158                  * SCSI Initiator Port TransportIDs, then we expect a valid
1159                  * matching ISID to be provided by the local SCSI Initiator Port.
1160                  */
1161                 if (!isid)
1162                         continue;
1163                 if (strcmp(isid, pr_reg->pr_reg_isid))
1164                         continue;
1165
1166                 atomic_inc_mb(&pr_reg->pr_res_holders);
1167                 spin_unlock(&pr_tmpl->registration_lock);
1168                 return pr_reg;
1169         }
1170         spin_unlock(&pr_tmpl->registration_lock);
1171
1172         return NULL;
1173 }
1174
1175 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1176         struct se_device *dev,
1177         struct se_node_acl *nacl,
1178         struct se_session *sess)
1179 {
1180         struct se_portal_group *tpg = nacl->se_tpg;
1181         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1182
1183         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1184                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1185                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1186                                         PR_REG_ISID_LEN);
1187                 isid_ptr = &buf[0];
1188         }
1189
1190         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1191 }
1192
1193 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1194 {
1195         atomic_dec_mb(&pr_reg->pr_res_holders);
1196 }
1197
1198 static int core_scsi3_check_implicit_release(
1199         struct se_device *dev,
1200         struct t10_pr_registration *pr_reg)
1201 {
1202         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1203         struct t10_pr_registration *pr_res_holder;
1204         int ret = 0;
1205
1206         spin_lock(&dev->dev_reservation_lock);
1207         pr_res_holder = dev->dev_pr_res_holder;
1208         if (!pr_res_holder) {
1209                 spin_unlock(&dev->dev_reservation_lock);
1210                 return ret;
1211         }
1212         if (pr_res_holder == pr_reg) {
1213                 /*
1214                  * Perform an implicit RELEASE if the registration that
1215                  * is being released is holding the reservation.
1216                  *
1217                  * From spc4r17, section 5.7.11.1:
1218                  *
1219                  * e) If the I_T nexus is the persistent reservation holder
1220                  *    and the persistent reservation is not an all registrants
1221                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1222                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1223                  *    service action with the SERVICE ACTION RESERVATION KEY
1224                  *    field set to zero (see 5.7.11.3).
1225                  */
1226                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1227                 ret = 1;
1228                 /*
1229                  * For 'All Registrants' reservation types, all existing
1230                  * registrations are still processed as reservation holders
1231                  * in core_scsi3_pr_seq_non_holder() after the initial
1232                  * reservation holder is implicitly released here.
1233                  */
1234         } else if (pr_reg->pr_reg_all_tg_pt &&
1235                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1236                           pr_reg->pr_reg_nacl->initiatorname)) &&
1237                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1238                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1239                         " UNREGISTER while existing reservation with matching"
1240                         " key 0x%016Lx is present from another SCSI Initiator"
1241                         " Port\n", pr_reg->pr_res_key);
1242                 ret = -EPERM;
1243         }
1244         spin_unlock(&dev->dev_reservation_lock);
1245
1246         return ret;
1247 }
1248
1249 /*
1250  * Called with struct t10_reservation->registration_lock held.
1251  */
1252 static void __core_scsi3_free_registration(
1253         struct se_device *dev,
1254         struct t10_pr_registration *pr_reg,
1255         struct list_head *preempt_and_abort_list,
1256         int dec_holders)
1257         __releases(&pr_tmpl->registration_lock)
1258         __acquires(&pr_tmpl->registration_lock)
1259 {
1260         const struct target_core_fabric_ops *tfo =
1261                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1262         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1263         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1264         struct se_dev_entry *deve;
1265         char i_buf[PR_REG_ISID_ID_LEN];
1266
1267         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1268         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1269
1270         if (!list_empty(&pr_reg->pr_reg_list))
1271                 list_del(&pr_reg->pr_reg_list);
1272         /*
1273          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1274          * so call core_scsi3_put_pr_reg() to decrement our reference.
1275          */
1276         if (dec_holders)
1277                 core_scsi3_put_pr_reg(pr_reg);
1278
1279         spin_unlock(&pr_tmpl->registration_lock);
1280         /*
1281          * Wait until all reference from any other I_T nexuses for this
1282          * *pr_reg have been released.  Because list_del() is called above,
1283          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1284          * count back to zero, and we release *pr_reg.
1285          */
1286         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1287                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1288                                 tfo->get_fabric_name());
1289                 cpu_relax();
1290         }
1291
1292         rcu_read_lock();
1293         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1294         if (deve)
1295                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1296         rcu_read_unlock();
1297
1298         spin_lock(&pr_tmpl->registration_lock);
1299         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1300                 " Node: %s%s\n", tfo->get_fabric_name(),
1301                 pr_reg->pr_reg_nacl->initiatorname,
1302                 i_buf);
1303         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1304                 " Port(s)\n", tfo->get_fabric_name(),
1305                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1306                 dev->transport->name);
1307         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1308                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1309                 pr_reg->pr_res_generation);
1310
1311         if (!preempt_and_abort_list) {
1312                 pr_reg->pr_reg_deve = NULL;
1313                 pr_reg->pr_reg_nacl = NULL;
1314                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1315                 return;
1316         }
1317         /*
1318          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1319          * are released once the ABORT_TASK_SET has completed..
1320          */
1321         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1322 }
1323
1324 void core_scsi3_free_pr_reg_from_nacl(
1325         struct se_device *dev,
1326         struct se_node_acl *nacl)
1327 {
1328         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1329         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1330         bool free_reg = false;
1331         /*
1332          * If the passed se_node_acl matches the reservation holder,
1333          * release the reservation.
1334          */
1335         spin_lock(&dev->dev_reservation_lock);
1336         pr_res_holder = dev->dev_pr_res_holder;
1337         if ((pr_res_holder != NULL) &&
1338             (pr_res_holder->pr_reg_nacl == nacl)) {
1339                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1340                 free_reg = true;
1341         }
1342         spin_unlock(&dev->dev_reservation_lock);
1343         /*
1344          * Release any registration associated with the struct se_node_acl.
1345          */
1346         spin_lock(&pr_tmpl->registration_lock);
1347         if (pr_res_holder && free_reg)
1348                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1349
1350         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1351                         &pr_tmpl->registration_list, pr_reg_list) {
1352
1353                 if (pr_reg->pr_reg_nacl != nacl)
1354                         continue;
1355
1356                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1357         }
1358         spin_unlock(&pr_tmpl->registration_lock);
1359 }
1360
1361 void core_scsi3_free_all_registrations(
1362         struct se_device *dev)
1363 {
1364         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1365         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1366
1367         spin_lock(&dev->dev_reservation_lock);
1368         pr_res_holder = dev->dev_pr_res_holder;
1369         if (pr_res_holder != NULL) {
1370                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1371                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1372                                                   pr_res_holder, 0, 0);
1373         }
1374         spin_unlock(&dev->dev_reservation_lock);
1375
1376         spin_lock(&pr_tmpl->registration_lock);
1377         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1378                         &pr_tmpl->registration_list, pr_reg_list) {
1379
1380                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1381         }
1382         spin_unlock(&pr_tmpl->registration_lock);
1383
1384         spin_lock(&pr_tmpl->aptpl_reg_lock);
1385         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1386                                 pr_reg_aptpl_list) {
1387                 list_del(&pr_reg->pr_reg_aptpl_list);
1388                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1389         }
1390         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1391 }
1392
1393 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1394 {
1395         return target_depend_item(&tpg->tpg_group.cg_item);
1396 }
1397
1398 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1399 {
1400         target_undepend_item(&tpg->tpg_group.cg_item);
1401         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1402 }
1403
1404 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1405 {
1406         if (nacl->dynamic_node_acl)
1407                 return 0;
1408         return target_depend_item(&nacl->acl_group.cg_item);
1409 }
1410
1411 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1412 {
1413         if (!nacl->dynamic_node_acl)
1414                 target_undepend_item(&nacl->acl_group.cg_item);
1415         atomic_dec_mb(&nacl->acl_pr_ref_count);
1416 }
1417
1418 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1419 {
1420         struct se_lun_acl *lun_acl;
1421         struct se_node_acl *nacl;
1422         struct se_portal_group *tpg;
1423         /*
1424          * For nacl->dynamic_node_acl=1
1425          */
1426         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1427                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1428         if (!lun_acl)
1429                 return 0;
1430
1431         nacl = lun_acl->se_lun_nacl;
1432         tpg = nacl->se_tpg;
1433
1434         return target_depend_item(&lun_acl->se_lun_group.cg_item);
1435 }
1436
1437 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1438 {
1439         struct se_lun_acl *lun_acl;
1440         struct se_node_acl *nacl;
1441         struct se_portal_group *tpg;
1442         /*
1443          * For nacl->dynamic_node_acl=1
1444          */
1445         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1446                                 atomic_read(&se_deve->pr_kref.refcount) != 0);
1447         if (!lun_acl) {
1448                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1449                 return;
1450         }
1451         nacl = lun_acl->se_lun_nacl;
1452         tpg = nacl->se_tpg;
1453
1454         target_undepend_item(&lun_acl->se_lun_group.cg_item);
1455         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1456 }
1457
1458 static sense_reason_t
1459 core_scsi3_decode_spec_i_port(
1460         struct se_cmd *cmd,
1461         struct se_portal_group *tpg,
1462         unsigned char *l_isid,
1463         u64 sa_res_key,
1464         int all_tg_pt,
1465         int aptpl)
1466 {
1467         struct se_device *dev = cmd->se_dev;
1468         struct se_port *tmp_port;
1469         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1470         struct se_session *se_sess = cmd->se_sess;
1471         struct se_node_acl *dest_node_acl = NULL;
1472         struct se_dev_entry *dest_se_deve = NULL;
1473         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1474         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1475         LIST_HEAD(tid_dest_list);
1476         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1477         unsigned char *buf, *ptr, proto_ident;
1478         const unsigned char *i_str;
1479         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1480         sense_reason_t ret;
1481         u32 tpdl, tid_len = 0;
1482         u32 dest_rtpi = 0;
1483
1484         /*
1485          * Allocate a struct pr_transport_id_holder and setup the
1486          * local_node_acl pointer and add to struct list_head tid_dest_list
1487          * for add registration processing in the loop of tid_dest_list below.
1488          */
1489         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1490         if (!tidh_new) {
1491                 pr_err("Unable to allocate tidh_new\n");
1492                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1493         }
1494         INIT_LIST_HEAD(&tidh_new->dest_list);
1495         tidh_new->dest_tpg = tpg;
1496         tidh_new->dest_node_acl = se_sess->se_node_acl;
1497
1498         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1499                                 se_sess->se_node_acl, cmd->se_lun,
1500                                 NULL, cmd->orig_fe_lun, l_isid,
1501                                 sa_res_key, all_tg_pt, aptpl);
1502         if (!local_pr_reg) {
1503                 kfree(tidh_new);
1504                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1505         }
1506         tidh_new->dest_pr_reg = local_pr_reg;
1507         /*
1508          * The local I_T nexus does not hold any configfs dependances,
1509          * so we set tidh_new->dest_se_deve to NULL to prevent the
1510          * configfs_undepend_item() calls in the tid_dest_list loops below.
1511          */
1512         tidh_new->dest_se_deve = NULL;
1513         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1514
1515         if (cmd->data_length < 28) {
1516                 pr_warn("SPC-PR: Received PR OUT parameter list"
1517                         " length too small: %u\n", cmd->data_length);
1518                 ret = TCM_INVALID_PARAMETER_LIST;
1519                 goto out;
1520         }
1521
1522         buf = transport_kmap_data_sg(cmd);
1523         if (!buf) {
1524                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1525                 goto out;
1526         }
1527
1528         /*
1529          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1530          * first extract TransportID Parameter Data Length, and make sure
1531          * the value matches up to the SCSI expected data transfer length.
1532          */
1533         tpdl = (buf[24] & 0xff) << 24;
1534         tpdl |= (buf[25] & 0xff) << 16;
1535         tpdl |= (buf[26] & 0xff) << 8;
1536         tpdl |= buf[27] & 0xff;
1537
1538         if ((tpdl + 28) != cmd->data_length) {
1539                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1540                         " does not equal CDB data_length: %u\n", tpdl,
1541                         cmd->data_length);
1542                 ret = TCM_INVALID_PARAMETER_LIST;
1543                 goto out_unmap;
1544         }
1545         /*
1546          * Start processing the received transport IDs using the
1547          * receiving I_T Nexus portal's fabric dependent methods to
1548          * obtain the SCSI Initiator Port/Device Identifiers.
1549          */
1550         ptr = &buf[28];
1551
1552         while (tpdl > 0) {
1553                 struct se_lun *dest_lun;
1554
1555                 proto_ident = (ptr[0] & 0x0f);
1556                 dest_tpg = NULL;
1557
1558                 spin_lock(&dev->se_port_lock);
1559                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1560                         tmp_tpg = tmp_port->sep_tpg;
1561                         if (!tmp_tpg)
1562                                 continue;
1563
1564                         /*
1565                          * Look for the matching proto_ident provided by
1566                          * the received TransportID
1567                          */
1568                         if (tmp_tpg->proto_id != proto_ident)
1569                                 continue;
1570                         dest_rtpi = tmp_port->sep_rtpi;
1571
1572                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1573                                         (const char *)ptr, &tid_len, &iport_ptr);
1574                         if (!i_str)
1575                                 continue;
1576
1577                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1578                         spin_unlock(&dev->se_port_lock);
1579
1580                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1581                                 pr_err(" core_scsi3_tpg_depend_item()"
1582                                         " for tmp_tpg\n");
1583                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1584                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1585                                 goto out_unmap;
1586                         }
1587                         /*
1588                          * Locate the destination initiator ACL to be registered
1589                          * from the decoded fabric module specific TransportID
1590                          * at *i_str.
1591                          */
1592                         mutex_lock(&tmp_tpg->acl_node_mutex);
1593                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1594                                                 tmp_tpg, i_str);
1595                         if (dest_node_acl)
1596                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1597                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1598
1599                         if (!dest_node_acl) {
1600                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1601                                 spin_lock(&dev->se_port_lock);
1602                                 continue;
1603                         }
1604
1605                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1606                                 pr_err("configfs_depend_item() failed"
1607                                         " for dest_node_acl->acl_group\n");
1608                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1609                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1610                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1611                                 goto out_unmap;
1612                         }
1613
1614                         dest_tpg = tmp_tpg;
1615                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1616                                 " %s Port RTPI: %hu\n",
1617                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1618                                 dest_node_acl->initiatorname, dest_rtpi);
1619
1620                         spin_lock(&dev->se_port_lock);
1621                         break;
1622                 }
1623                 spin_unlock(&dev->se_port_lock);
1624
1625                 if (!dest_tpg) {
1626                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1627                                         " dest_tpg\n");
1628                         ret = TCM_INVALID_PARAMETER_LIST;
1629                         goto out_unmap;
1630                 }
1631
1632                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1633                         " tid_len: %d for %s + %s\n",
1634                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1635                         tpdl, tid_len, i_str, iport_ptr);
1636
1637                 if (tid_len > tpdl) {
1638                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1639                                 " %u for Transport ID: %s\n", tid_len, ptr);
1640                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1641                         core_scsi3_tpg_undepend_item(dest_tpg);
1642                         ret = TCM_INVALID_PARAMETER_LIST;
1643                         goto out_unmap;
1644                 }
1645                 /*
1646                  * Locate the desintation struct se_dev_entry pointer for matching
1647                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1648                  * Target Port.
1649                  */
1650                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1651                                         dest_rtpi);
1652                 if (!dest_se_deve) {
1653                         pr_err("Unable to locate %s dest_se_deve"
1654                                 " from destination RTPI: %hu\n",
1655                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1656                                 dest_rtpi);
1657
1658                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1659                         core_scsi3_tpg_undepend_item(dest_tpg);
1660                         ret = TCM_INVALID_PARAMETER_LIST;
1661                         goto out_unmap;
1662                 }
1663
1664                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1665                         pr_err("core_scsi3_lunacl_depend_item()"
1666                                         " failed\n");
1667                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1668                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669                         core_scsi3_tpg_undepend_item(dest_tpg);
1670                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1671                         goto out_unmap;
1672                 }
1673
1674                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1675                         " dest_se_deve mapped_lun: %u\n",
1676                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1677                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1678
1679                 /*
1680                  * Skip any TransportIDs that already have a registration for
1681                  * this target port.
1682                  */
1683                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1684                                         iport_ptr);
1685                 if (pr_reg_e) {
1686                         core_scsi3_put_pr_reg(pr_reg_e);
1687                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1688                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1689                         core_scsi3_tpg_undepend_item(dest_tpg);
1690                         ptr += tid_len;
1691                         tpdl -= tid_len;
1692                         tid_len = 0;
1693                         continue;
1694                 }
1695                 /*
1696                  * Allocate a struct pr_transport_id_holder and setup
1697                  * the dest_node_acl and dest_se_deve pointers for the
1698                  * loop below.
1699                  */
1700                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1701                                 GFP_KERNEL);
1702                 if (!tidh_new) {
1703                         pr_err("Unable to allocate tidh_new\n");
1704                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1705                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1706                         core_scsi3_tpg_undepend_item(dest_tpg);
1707                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1708                         goto out_unmap;
1709                 }
1710                 INIT_LIST_HEAD(&tidh_new->dest_list);
1711                 tidh_new->dest_tpg = dest_tpg;
1712                 tidh_new->dest_node_acl = dest_node_acl;
1713                 tidh_new->dest_se_deve = dest_se_deve;
1714
1715                 /*
1716                  * Allocate, but do NOT add the registration for the
1717                  * TransportID referenced SCSI Initiator port.  This
1718                  * done because of the following from spc4r17 in section
1719                  * 6.14.3 wrt SPEC_I_PT:
1720                  *
1721                  * "If a registration fails for any initiator port (e.g., if th
1722                  * logical unit does not have enough resources available to
1723                  * hold the registration information), no registrations shall be
1724                  * made, and the command shall be terminated with
1725                  * CHECK CONDITION status."
1726                  *
1727                  * That means we call __core_scsi3_alloc_registration() here,
1728                  * and then call __core_scsi3_add_registration() in the
1729                  * 2nd loop which will never fail.
1730                  */
1731                 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1732                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
1733
1734                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1735                                         dest_node_acl, dest_lun, dest_se_deve,
1736                                         dest_se_deve->mapped_lun, iport_ptr,
1737                                         sa_res_key, all_tg_pt, aptpl);
1738                 if (!dest_pr_reg) {
1739                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1740                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1741                         core_scsi3_tpg_undepend_item(dest_tpg);
1742                         kfree(tidh_new);
1743                         ret = TCM_INVALID_PARAMETER_LIST;
1744                         goto out_unmap;
1745                 }
1746                 tidh_new->dest_pr_reg = dest_pr_reg;
1747                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1748
1749                 ptr += tid_len;
1750                 tpdl -= tid_len;
1751                 tid_len = 0;
1752
1753         }
1754
1755         transport_kunmap_data_sg(cmd);
1756
1757         /*
1758          * Go ahead and create a registrations from tid_dest_list for the
1759          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1760          * and dest_se_deve.
1761          *
1762          * The SA Reservation Key from the PROUT is set for the
1763          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1764          * means that the TransportID Initiator port will be
1765          * registered on all of the target ports in the SCSI target device
1766          * ALL_TG_PT=0 means the registration will only be for the
1767          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1768          * was received.
1769          */
1770         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1771                 dest_tpg = tidh->dest_tpg;
1772                 dest_node_acl = tidh->dest_node_acl;
1773                 dest_se_deve = tidh->dest_se_deve;
1774                 dest_pr_reg = tidh->dest_pr_reg;
1775
1776                 list_del(&tidh->dest_list);
1777                 kfree(tidh);
1778
1779                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1780                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1781
1782                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1783                                         dest_pr_reg, 0, 0);
1784
1785                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1786                         " registered Transport ID for Node: %s%s Mapped LUN:"
1787                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1788                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1789                         dest_se_deve->mapped_lun : 0);
1790
1791                 if (!dest_se_deve)
1792                         continue;
1793
1794                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1795                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1796                 core_scsi3_tpg_undepend_item(dest_tpg);
1797         }
1798
1799         return 0;
1800 out_unmap:
1801         transport_kunmap_data_sg(cmd);
1802 out:
1803         /*
1804          * For the failure case, release everything from tid_dest_list
1805          * including *dest_pr_reg and the configfs dependances..
1806          */
1807         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1808                 dest_tpg = tidh->dest_tpg;
1809                 dest_node_acl = tidh->dest_node_acl;
1810                 dest_se_deve = tidh->dest_se_deve;
1811                 dest_pr_reg = tidh->dest_pr_reg;
1812
1813                 list_del(&tidh->dest_list);
1814                 kfree(tidh);
1815                 /*
1816                  * Release any extra ALL_TG_PT=1 registrations for
1817                  * the SPEC_I_PT=1 case.
1818                  */
1819                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1820                                 &dest_pr_reg->pr_reg_atp_list,
1821                                 pr_reg_atp_mem_list) {
1822                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1823                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1824                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1825                 }
1826
1827                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1828
1829                 if (!dest_se_deve)
1830                         continue;
1831
1832                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1833                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1834                 core_scsi3_tpg_undepend_item(dest_tpg);
1835         }
1836         return ret;
1837 }
1838
1839 static int core_scsi3_update_aptpl_buf(
1840         struct se_device *dev,
1841         unsigned char *buf,
1842         u32 pr_aptpl_buf_len)
1843 {
1844         struct se_portal_group *tpg;
1845         struct t10_pr_registration *pr_reg;
1846         unsigned char tmp[512], isid_buf[32];
1847         ssize_t len = 0;
1848         int reg_count = 0;
1849         int ret = 0;
1850
1851         spin_lock(&dev->dev_reservation_lock);
1852         spin_lock(&dev->t10_pr.registration_lock);
1853         /*
1854          * Walk the registration list..
1855          */
1856         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1857                         pr_reg_list) {
1858
1859                 tmp[0] = '\0';
1860                 isid_buf[0] = '\0';
1861                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1862                 /*
1863                  * Write out any ISID value to APTPL metadata that was included
1864                  * in the original registration.
1865                  */
1866                 if (pr_reg->isid_present_at_reg)
1867                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1868                                         pr_reg->pr_reg_isid);
1869                 /*
1870                  * Include special metadata if the pr_reg matches the
1871                  * reservation holder.
1872                  */
1873                 if (dev->dev_pr_res_holder == pr_reg) {
1874                         snprintf(tmp, 512, "PR_REG_START: %d"
1875                                 "\ninitiator_fabric=%s\n"
1876                                 "initiator_node=%s\n%s"
1877                                 "sa_res_key=%llu\n"
1878                                 "res_holder=1\nres_type=%02x\n"
1879                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1880                                 "mapped_lun=%u\n", reg_count,
1881                                 tpg->se_tpg_tfo->get_fabric_name(),
1882                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1883                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1884                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1885                                 pr_reg->pr_res_mapped_lun);
1886                 } else {
1887                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1888                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1889                                 "sa_res_key=%llu\nres_holder=0\n"
1890                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1891                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1892                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1893                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1894                                 pr_reg->pr_res_mapped_lun);
1895                 }
1896
1897                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1898                         pr_err("Unable to update renaming APTPL metadata,"
1899                                " reallocating larger buffer\n");
1900                         ret = -EMSGSIZE;
1901                         goto out;
1902                 }
1903                 len += sprintf(buf+len, "%s", tmp);
1904
1905                 /*
1906                  * Include information about the associated SCSI target port.
1907                  */
1908                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1909                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1910                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1911                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1912                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1913                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1914                         reg_count);
1915
1916                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1917                         pr_err("Unable to update renaming APTPL metadata,"
1918                                " reallocating larger buffer\n");
1919                         ret = -EMSGSIZE;
1920                         goto out;
1921                 }
1922                 len += sprintf(buf+len, "%s", tmp);
1923                 reg_count++;
1924         }
1925
1926         if (!reg_count)
1927                 len += sprintf(buf+len, "No Registrations or Reservations");
1928
1929 out:
1930         spin_unlock(&dev->t10_pr.registration_lock);
1931         spin_unlock(&dev->dev_reservation_lock);
1932
1933         return ret;
1934 }
1935
1936 static int __core_scsi3_write_aptpl_to_file(
1937         struct se_device *dev,
1938         unsigned char *buf)
1939 {
1940         struct t10_wwn *wwn = &dev->t10_wwn;
1941         struct file *file;
1942         int flags = O_RDWR | O_CREAT | O_TRUNC;
1943         char path[512];
1944         u32 pr_aptpl_buf_len;
1945         int ret;
1946
1947         memset(path, 0, 512);
1948
1949         if (strlen(&wwn->unit_serial[0]) >= 512) {
1950                 pr_err("WWN value for struct se_device does not fit"
1951                         " into path buffer\n");
1952                 return -EMSGSIZE;
1953         }
1954
1955         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1956         file = filp_open(path, flags, 0600);
1957         if (IS_ERR(file)) {
1958                 pr_err("filp_open(%s) for APTPL metadata"
1959                         " failed\n", path);
1960                 return PTR_ERR(file);
1961         }
1962
1963         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1964
1965         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1966
1967         if (ret < 0)
1968                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1969         fput(file);
1970
1971         return (ret < 0) ? -EIO : 0;
1972 }
1973
1974 /*
1975  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1976  * write out the updated metadata to struct file for this SCSI device.
1977  */
1978 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1979 {
1980         unsigned char *buf;
1981         int rc, len = PR_APTPL_BUF_LEN;
1982
1983         if (!aptpl) {
1984                 char *null_buf = "No Registrations or Reservations\n";
1985
1986                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
1987                 dev->t10_pr.pr_aptpl_active = 0;
1988                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
1989
1990                 if (rc)
1991                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1992
1993                 return 0;
1994         }
1995 retry:
1996         buf = vzalloc(len);
1997         if (!buf)
1998                 return TCM_OUT_OF_RESOURCES;
1999
2000         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2001         if (rc < 0) {
2002                 vfree(buf);
2003                 len *= 2;
2004                 goto retry;
2005         }
2006
2007         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2008         if (rc != 0) {
2009                 pr_err("SPC-3 PR: Could not update APTPL\n");
2010                 vfree(buf);
2011                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2012         }
2013         dev->t10_pr.pr_aptpl_active = 1;
2014         vfree(buf);
2015         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2016         return 0;
2017 }
2018
2019 static sense_reason_t
2020 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2021                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2022 {
2023         struct se_session *se_sess = cmd->se_sess;
2024         struct se_device *dev = cmd->se_dev;
2025         struct se_lun *se_lun = cmd->se_lun;
2026         struct se_portal_group *se_tpg;
2027         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2028         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2029         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2030         sense_reason_t ret = TCM_NO_SENSE;
2031         int pr_holder = 0, type;
2032
2033         if (!se_sess || !se_lun) {
2034                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2035                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2036         }
2037         se_tpg = se_sess->se_tpg;
2038
2039         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2040                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2041                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2042                                 PR_REG_ISID_LEN);
2043                 isid_ptr = &isid_buf[0];
2044         }
2045         /*
2046          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2047          */
2048         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2049         if (!pr_reg) {
2050                 if (res_key) {
2051                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2052                                 " for SA REGISTER, returning CONFLICT\n");
2053                         return TCM_RESERVATION_CONFLICT;
2054                 }
2055                 /*
2056                  * Do nothing but return GOOD status.
2057                  */
2058                 if (!sa_res_key)
2059                         return 0;
2060
2061                 if (!spec_i_pt) {
2062                         /*
2063                          * Perform the Service Action REGISTER on the Initiator
2064                          * Port Endpoint that the PRO was received from on the
2065                          * Logical Unit of the SCSI device server.
2066                          */
2067                         if (core_scsi3_alloc_registration(cmd->se_dev,
2068                                         se_sess->se_node_acl, cmd->se_lun,
2069                                         NULL, cmd->orig_fe_lun, isid_ptr,
2070                                         sa_res_key, all_tg_pt, aptpl,
2071                                         register_type, 0)) {
2072                                 pr_err("Unable to allocate"
2073                                         " struct t10_pr_registration\n");
2074                                 return TCM_INVALID_PARAMETER_LIST;
2075                         }
2076                 } else {
2077                         /*
2078                          * Register both the Initiator port that received
2079                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2080                          * TransportID from Parameter list and loop through
2081                          * fabric dependent parameter list while calling
2082                          * logic from of core_scsi3_alloc_registration() for
2083                          * each TransportID provided SCSI Initiator Port/Device
2084                          */
2085                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2086                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2087                         if (ret != 0)
2088                                 return ret;
2089                 }
2090                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2091         }
2092
2093         /* ok, existing registration */
2094
2095         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2096                 pr_err("SPC-3 PR REGISTER: Received"
2097                        " res_key: 0x%016Lx does not match"
2098                        " existing SA REGISTER res_key:"
2099                        " 0x%016Lx\n", res_key,
2100                        pr_reg->pr_res_key);
2101                 ret = TCM_RESERVATION_CONFLICT;
2102                 goto out;
2103         }
2104
2105         if (spec_i_pt) {
2106                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2107                         " set on a registered nexus\n");
2108                 ret = TCM_INVALID_PARAMETER_LIST;
2109                 goto out;
2110         }
2111
2112         /*
2113          * An existing ALL_TG_PT=1 registration being released
2114          * must also set ALL_TG_PT=1 in the incoming PROUT.
2115          */
2116         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2117                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2118                         " registration exists, but ALL_TG_PT=1 bit not"
2119                         " present in received PROUT\n");
2120                 ret = TCM_INVALID_CDB_FIELD;
2121                 goto out;
2122         }
2123
2124         /*
2125          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2126          */
2127         if (sa_res_key) {
2128                 /*
2129                  * Increment PRgeneration counter for struct se_device"
2130                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2131                  * READ_KEYS service action.
2132                  */
2133                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2134                 pr_reg->pr_res_key = sa_res_key;
2135                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2136                          " Key for %s to: 0x%016Lx PRgeneration:"
2137                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2138                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2139                          pr_reg->pr_reg_nacl->initiatorname,
2140                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2141
2142         } else {
2143                 /*
2144                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2145                  */
2146                 type = pr_reg->pr_res_type;
2147                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2148                                                               pr_reg);
2149                 if (pr_holder < 0) {
2150                         ret = TCM_RESERVATION_CONFLICT;
2151                         goto out;
2152                 }
2153
2154                 spin_lock(&pr_tmpl->registration_lock);
2155                 /*
2156                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2157                  * and matching pr_res_key.
2158                  */
2159                 if (pr_reg->pr_reg_all_tg_pt) {
2160                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2161                                         &pr_tmpl->registration_list,
2162                                         pr_reg_list) {
2163
2164                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2165                                         continue;
2166                                 if (pr_reg_p->pr_res_key != res_key)
2167                                         continue;
2168                                 if (pr_reg == pr_reg_p)
2169                                         continue;
2170                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2171                                            pr_reg_p->pr_reg_nacl->initiatorname))
2172                                         continue;
2173
2174                                 __core_scsi3_free_registration(dev,
2175                                                 pr_reg_p, NULL, 0);
2176                         }
2177                 }
2178
2179                 /*
2180                  * Release the calling I_T Nexus registration now..
2181                  */
2182                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2183                 pr_reg = NULL;
2184
2185                 /*
2186                  * From spc4r17, section 5.7.11.3 Unregistering
2187                  *
2188                  * If the persistent reservation is a registrants only
2189                  * type, the device server shall establish a unit
2190                  * attention condition for the initiator port associated
2191                  * with every registered I_T nexus except for the I_T
2192                  * nexus on which the PERSISTENT RESERVE OUT command was
2193                  * received, with the additional sense code set to
2194                  * RESERVATIONS RELEASED.
2195                  */
2196                 if (pr_holder &&
2197                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2198                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2199                         list_for_each_entry(pr_reg_p,
2200                                         &pr_tmpl->registration_list,
2201                                         pr_reg_list) {
2202
2203                                 core_scsi3_ua_allocate(
2204                                         pr_reg_p->pr_reg_nacl,
2205                                         pr_reg_p->pr_res_mapped_lun,
2206                                         0x2A,
2207                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2208                         }
2209                 }
2210
2211                 spin_unlock(&pr_tmpl->registration_lock);
2212         }
2213
2214         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2215
2216 out:
2217         if (pr_reg)
2218                 core_scsi3_put_pr_reg(pr_reg);
2219         return ret;
2220 }
2221
2222 unsigned char *core_scsi3_pr_dump_type(int type)
2223 {
2224         switch (type) {
2225         case PR_TYPE_WRITE_EXCLUSIVE:
2226                 return "Write Exclusive Access";
2227         case PR_TYPE_EXCLUSIVE_ACCESS:
2228                 return "Exclusive Access";
2229         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2230                 return "Write Exclusive Access, Registrants Only";
2231         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2232                 return "Exclusive Access, Registrants Only";
2233         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2234                 return "Write Exclusive Access, All Registrants";
2235         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2236                 return "Exclusive Access, All Registrants";
2237         default:
2238                 break;
2239         }
2240
2241         return "Unknown SPC-3 PR Type";
2242 }
2243
2244 static sense_reason_t
2245 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2246 {
2247         struct se_device *dev = cmd->se_dev;
2248         struct se_session *se_sess = cmd->se_sess;
2249         struct se_lun *se_lun = cmd->se_lun;
2250         struct t10_pr_registration *pr_reg, *pr_res_holder;
2251         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2252         char i_buf[PR_REG_ISID_ID_LEN];
2253         sense_reason_t ret;
2254
2255         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2256
2257         if (!se_sess || !se_lun) {
2258                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2259                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2260         }
2261         /*
2262          * Locate the existing *pr_reg via struct se_node_acl pointers
2263          */
2264         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2265                                 se_sess);
2266         if (!pr_reg) {
2267                 pr_err("SPC-3 PR: Unable to locate"
2268                         " PR_REGISTERED *pr_reg for RESERVE\n");
2269                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2270         }
2271         /*
2272          * From spc4r17 Section 5.7.9: Reserving:
2273          *
2274          * An application client creates a persistent reservation by issuing
2275          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2276          * a registered I_T nexus with the following parameters:
2277          *    a) RESERVATION KEY set to the value of the reservation key that is
2278          *       registered with the logical unit for the I_T nexus; and
2279          */
2280         if (res_key != pr_reg->pr_res_key) {
2281                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2282                         " does not match existing SA REGISTER res_key:"
2283                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2284                 ret = TCM_RESERVATION_CONFLICT;
2285                 goto out_put_pr_reg;
2286         }
2287         /*
2288          * From spc4r17 Section 5.7.9: Reserving:
2289          *
2290          * From above:
2291          *  b) TYPE field and SCOPE field set to the persistent reservation
2292          *     being created.
2293          *
2294          * Only one persistent reservation is allowed at a time per logical unit
2295          * and that persistent reservation has a scope of LU_SCOPE.
2296          */
2297         if (scope != PR_SCOPE_LU_SCOPE) {
2298                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2299                 ret = TCM_INVALID_PARAMETER_LIST;
2300                 goto out_put_pr_reg;
2301         }
2302         /*
2303          * See if we have an existing PR reservation holder pointer at
2304          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2305          * *pr_res_holder.
2306          */
2307         spin_lock(&dev->dev_reservation_lock);
2308         pr_res_holder = dev->dev_pr_res_holder;
2309         if (pr_res_holder) {
2310                 /*
2311                  * From spc4r17 Section 5.7.9: Reserving:
2312                  *
2313                  * If the device server receives a PERSISTENT RESERVE OUT
2314                  * command from an I_T nexus other than a persistent reservation
2315                  * holder (see 5.7.10) that attempts to create a persistent
2316                  * reservation when a persistent reservation already exists for
2317                  * the logical unit, then the command shall be completed with
2318                  * RESERVATION CONFLICT status.
2319                  */
2320                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2321                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2322                         pr_err("SPC-3 PR: Attempted RESERVE from"
2323                                 " [%s]: %s while reservation already held by"
2324                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2325                                 cmd->se_tfo->get_fabric_name(),
2326                                 se_sess->se_node_acl->initiatorname,
2327                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2328                                 pr_res_holder->pr_reg_nacl->initiatorname);
2329
2330                         spin_unlock(&dev->dev_reservation_lock);
2331                         ret = TCM_RESERVATION_CONFLICT;
2332                         goto out_put_pr_reg;
2333                 }
2334                 /*
2335                  * From spc4r17 Section 5.7.9: Reserving:
2336                  *
2337                  * If a persistent reservation holder attempts to modify the
2338                  * type or scope of an existing persistent reservation, the
2339                  * command shall be completed with RESERVATION CONFLICT status.
2340                  */
2341                 if ((pr_res_holder->pr_res_type != type) ||
2342                     (pr_res_holder->pr_res_scope != scope)) {
2343                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2344                         pr_err("SPC-3 PR: Attempted RESERVE from"
2345                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2346                                 " while reservation already held by [%s]: %s,"
2347                                 " returning RESERVATION_CONFLICT\n",
2348                                 cmd->se_tfo->get_fabric_name(),
2349                                 se_sess->se_node_acl->initiatorname,
2350                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2351                                 pr_res_holder->pr_reg_nacl->initiatorname);
2352
2353                         spin_unlock(&dev->dev_reservation_lock);
2354                         ret = TCM_RESERVATION_CONFLICT;
2355                         goto out_put_pr_reg;
2356                 }
2357                 /*
2358                  * From spc4r17 Section 5.7.9: Reserving:
2359                  *
2360                  * If the device server receives a PERSISTENT RESERVE OUT
2361                  * command with RESERVE service action where the TYPE field and
2362                  * the SCOPE field contain the same values as the existing type
2363                  * and scope from a persistent reservation holder, it shall not
2364                  * make any change to the existing persistent reservation and
2365                  * shall completethe command with GOOD status.
2366                  */
2367                 spin_unlock(&dev->dev_reservation_lock);
2368                 ret = 0;
2369                 goto out_put_pr_reg;
2370         }
2371         /*
2372          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2373          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2374          */
2375         pr_reg->pr_res_scope = scope;
2376         pr_reg->pr_res_type = type;
2377         pr_reg->pr_res_holder = 1;
2378         dev->dev_pr_res_holder = pr_reg;
2379         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2380
2381         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2382                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2383                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2384                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2385         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2386                         cmd->se_tfo->get_fabric_name(),
2387                         se_sess->se_node_acl->initiatorname,
2388                         i_buf);
2389         spin_unlock(&dev->dev_reservation_lock);
2390
2391         if (pr_tmpl->pr_aptpl_active)
2392                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2393
2394         ret = 0;
2395 out_put_pr_reg:
2396         core_scsi3_put_pr_reg(pr_reg);
2397         return ret;
2398 }
2399
2400 static sense_reason_t
2401 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2402                 u64 res_key)
2403 {
2404         switch (type) {
2405         case PR_TYPE_WRITE_EXCLUSIVE:
2406         case PR_TYPE_EXCLUSIVE_ACCESS:
2407         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2408         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2409         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2410         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2411                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2412         default:
2413                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2414                         " 0x%02x\n", type);
2415                 return TCM_INVALID_CDB_FIELD;
2416         }
2417 }
2418
2419 /*
2420  * Called with struct se_device->dev_reservation_lock held.
2421  */
2422 static void __core_scsi3_complete_pro_release(
2423         struct se_device *dev,
2424         struct se_node_acl *se_nacl,
2425         struct t10_pr_registration *pr_reg,
2426         int explicit,
2427         int unreg)
2428 {
2429         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2430         char i_buf[PR_REG_ISID_ID_LEN];
2431         int pr_res_type = 0, pr_res_scope = 0;
2432
2433         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2434         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2435         /*
2436          * Go ahead and release the current PR reservation holder.
2437          * If an All Registrants reservation is currently active and
2438          * a unregister operation is requested, replace the current
2439          * dev_pr_res_holder with another active registration.
2440          */
2441         if (dev->dev_pr_res_holder) {
2442                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2443                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2444                 dev->dev_pr_res_holder->pr_res_type = 0;
2445                 dev->dev_pr_res_holder->pr_res_scope = 0;
2446                 dev->dev_pr_res_holder->pr_res_holder = 0;
2447                 dev->dev_pr_res_holder = NULL;
2448         }
2449         if (!unreg)
2450                 goto out;
2451
2452         spin_lock(&dev->t10_pr.registration_lock);
2453         list_del_init(&pr_reg->pr_reg_list);
2454         /*
2455          * If the I_T nexus is a reservation holder, the persistent reservation
2456          * is of an all registrants type, and the I_T nexus is the last remaining
2457          * registered I_T nexus, then the device server shall also release the
2458          * persistent reservation.
2459          */
2460         if (!list_empty(&dev->t10_pr.registration_list) &&
2461             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2462              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2463                 dev->dev_pr_res_holder =
2464                         list_entry(dev->t10_pr.registration_list.next,
2465                                    struct t10_pr_registration, pr_reg_list);
2466                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2467                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2468                 dev->dev_pr_res_holder->pr_res_holder = 1;
2469         }
2470         spin_unlock(&dev->t10_pr.registration_lock);
2471 out:
2472         if (!dev->dev_pr_res_holder) {
2473                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2474                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2475                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2476                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2477                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2478         }
2479         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2480                 tfo->get_fabric_name(), se_nacl->initiatorname,
2481                 i_buf);
2482         /*
2483          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2484          */
2485         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2486 }
2487
2488 static sense_reason_t
2489 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2490                 u64 res_key)
2491 {
2492         struct se_device *dev = cmd->se_dev;
2493         struct se_session *se_sess = cmd->se_sess;
2494         struct se_lun *se_lun = cmd->se_lun;
2495         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2496         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2497         sense_reason_t ret = 0;
2498
2499         if (!se_sess || !se_lun) {
2500                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2501                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2502         }
2503         /*
2504          * Locate the existing *pr_reg via struct se_node_acl pointers
2505          */
2506         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2507         if (!pr_reg) {
2508                 pr_err("SPC-3 PR: Unable to locate"
2509                         " PR_REGISTERED *pr_reg for RELEASE\n");
2510                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2511         }
2512         /*
2513          * From spc4r17 Section 5.7.11.2 Releasing:
2514          *
2515          * If there is no persistent reservation or in response to a persistent
2516          * reservation release request from a registered I_T nexus that is not a
2517          * persistent reservation holder (see 5.7.10), the device server shall
2518          * do the following:
2519          *
2520          *     a) Not release the persistent reservation, if any;
2521          *     b) Not remove any registrations; and
2522          *     c) Complete the command with GOOD status.
2523          */
2524         spin_lock(&dev->dev_reservation_lock);
2525         pr_res_holder = dev->dev_pr_res_holder;
2526         if (!pr_res_holder) {
2527                 /*
2528                  * No persistent reservation, return GOOD status.
2529                  */
2530                 spin_unlock(&dev->dev_reservation_lock);
2531                 goto out_put_pr_reg;
2532         }
2533
2534         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2535                 /*
2536                  * Release request from a registered I_T nexus that is not a
2537                  * persistent reservation holder. return GOOD status.
2538                  */
2539                 spin_unlock(&dev->dev_reservation_lock);
2540                 goto out_put_pr_reg;
2541         }
2542
2543         /*
2544          * From spc4r17 Section 5.7.11.2 Releasing:
2545          *
2546          * Only the persistent reservation holder (see 5.7.10) is allowed to
2547          * release a persistent reservation.
2548          *
2549          * An application client releases the persistent reservation by issuing
2550          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2551          * an I_T nexus that is a persistent reservation holder with the
2552          * following parameters:
2553          *
2554          *     a) RESERVATION KEY field set to the value of the reservation key
2555          *        that is registered with the logical unit for the I_T nexus;
2556          */
2557         if (res_key != pr_reg->pr_res_key) {
2558                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2559                         " does not match existing SA REGISTER res_key:"
2560                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2561                 spin_unlock(&dev->dev_reservation_lock);
2562                 ret = TCM_RESERVATION_CONFLICT;
2563                 goto out_put_pr_reg;
2564         }
2565         /*
2566          * From spc4r17 Section 5.7.11.2 Releasing and above:
2567          *
2568          * b) TYPE field and SCOPE field set to match the persistent
2569          *    reservation being released.
2570          */
2571         if ((pr_res_holder->pr_res_type != type) ||
2572             (pr_res_holder->pr_res_scope != scope)) {
2573                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2574                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2575                         " reservation from [%s]: %s with different TYPE "
2576                         "and/or SCOPE  while reservation already held by"
2577                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2578                         cmd->se_tfo->get_fabric_name(),
2579                         se_sess->se_node_acl->initiatorname,
2580                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2581                         pr_res_holder->pr_reg_nacl->initiatorname);
2582
2583                 spin_unlock(&dev->dev_reservation_lock);
2584                 ret = TCM_RESERVATION_CONFLICT;
2585                 goto out_put_pr_reg;
2586         }
2587         /*
2588          * In response to a persistent reservation release request from the
2589          * persistent reservation holder the device server shall perform a
2590          * release by doing the following as an uninterrupted series of actions:
2591          * a) Release the persistent reservation;
2592          * b) Not remove any registration(s);
2593          * c) If the released persistent reservation is a registrants only type
2594          * or all registrants type persistent reservation,
2595          *    the device server shall establish a unit attention condition for
2596          *    the initiator port associated with every regis-
2597          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2598          *    RESERVE OUT command with RELEASE service action was received,
2599          *    with the additional sense code set to RESERVATIONS RELEASED; and
2600          * d) If the persistent reservation is of any other type, the device
2601          *    server shall not establish a unit attention condition.
2602          */
2603         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2604                                           pr_reg, 1, 0);
2605
2606         spin_unlock(&dev->dev_reservation_lock);
2607
2608         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2609             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2610             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2611             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2612                 /*
2613                  * If no UNIT ATTENTION conditions will be established for
2614                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2615                  * go ahead and check for APTPL=1 update+write below
2616                  */
2617                 goto write_aptpl;
2618         }
2619
2620         spin_lock(&pr_tmpl->registration_lock);
2621         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2622                         pr_reg_list) {
2623                 /*
2624                  * Do not establish a UNIT ATTENTION condition
2625                  * for the calling I_T Nexus
2626                  */
2627                 if (pr_reg_p == pr_reg)
2628                         continue;
2629
2630                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2631                                 pr_reg_p->pr_res_mapped_lun,
2632                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2633         }
2634         spin_unlock(&pr_tmpl->registration_lock);
2635
2636 write_aptpl:
2637         if (pr_tmpl->pr_aptpl_active)
2638                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2639
2640 out_put_pr_reg:
2641         core_scsi3_put_pr_reg(pr_reg);
2642         return ret;
2643 }
2644
2645 static sense_reason_t
2646 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2647 {
2648         struct se_device *dev = cmd->se_dev;
2649         struct se_node_acl *pr_reg_nacl;
2650         struct se_session *se_sess = cmd->se_sess;
2651         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2652         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2653         u32 pr_res_mapped_lun = 0;
2654         int calling_it_nexus = 0;
2655         /*
2656          * Locate the existing *pr_reg via struct se_node_acl pointers
2657          */
2658         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2659                         se_sess->se_node_acl, se_sess);
2660         if (!pr_reg_n) {
2661                 pr_err("SPC-3 PR: Unable to locate"
2662                         " PR_REGISTERED *pr_reg for CLEAR\n");
2663                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2664         }
2665         /*
2666          * From spc4r17 section 5.7.11.6, Clearing:
2667          *
2668          * Any application client may release the persistent reservation and
2669          * remove all registrations from a device server by issuing a
2670          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2671          * registered I_T nexus with the following parameter:
2672          *
2673          *      a) RESERVATION KEY field set to the value of the reservation key
2674          *         that is registered with the logical unit for the I_T nexus.
2675          */
2676         if (res_key != pr_reg_n->pr_res_key) {
2677                 pr_err("SPC-3 PR REGISTER: Received"
2678                         " res_key: 0x%016Lx does not match"
2679                         " existing SA REGISTER res_key:"
2680                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2681                 core_scsi3_put_pr_reg(pr_reg_n);
2682                 return TCM_RESERVATION_CONFLICT;
2683         }
2684         /*
2685          * a) Release the persistent reservation, if any;
2686          */
2687         spin_lock(&dev->dev_reservation_lock);
2688         pr_res_holder = dev->dev_pr_res_holder;
2689         if (pr_res_holder) {
2690                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2691                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2692                                                   pr_res_holder, 0, 0);
2693         }
2694         spin_unlock(&dev->dev_reservation_lock);
2695         /*
2696          * b) Remove all registration(s) (see spc4r17 5.7.7);
2697          */
2698         spin_lock(&pr_tmpl->registration_lock);
2699         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2700                         &pr_tmpl->registration_list, pr_reg_list) {
2701
2702                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2703                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2704                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2705                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2706                                         calling_it_nexus);
2707                 /*
2708                  * e) Establish a unit attention condition for the initiator
2709                  *    port associated with every registered I_T nexus other
2710                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2711                  *    command with CLEAR service action was received, with the
2712                  *    additional sense code set to RESERVATIONS PREEMPTED.
2713                  */
2714                 if (!calling_it_nexus)
2715                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2716                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2717         }
2718         spin_unlock(&pr_tmpl->registration_lock);
2719
2720         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2721                 cmd->se_tfo->get_fabric_name());
2722
2723         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2724
2725         core_scsi3_pr_generation(dev);
2726         return 0;
2727 }
2728
2729 /*
2730  * Called with struct se_device->dev_reservation_lock held.
2731  */
2732 static void __core_scsi3_complete_pro_preempt(
2733         struct se_device *dev,
2734         struct t10_pr_registration *pr_reg,
2735         struct list_head *preempt_and_abort_list,
2736         int type,
2737         int scope,
2738         enum preempt_type preempt_type)
2739 {
2740         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2741         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2742         char i_buf[PR_REG_ISID_ID_LEN];
2743
2744         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2745         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2746         /*
2747          * Do an implicit RELEASE of the existing reservation.
2748          */
2749         if (dev->dev_pr_res_holder)
2750                 __core_scsi3_complete_pro_release(dev, nacl,
2751                                                   dev->dev_pr_res_holder, 0, 0);
2752
2753         dev->dev_pr_res_holder = pr_reg;
2754         pr_reg->pr_res_holder = 1;
2755         pr_reg->pr_res_type = type;
2756         pr_reg->pr_res_scope = scope;
2757
2758         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2759                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2760                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2761                 core_scsi3_pr_dump_type(type),
2762                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2763         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2764                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2765                 nacl->initiatorname, i_buf);
2766         /*
2767          * For PREEMPT_AND_ABORT, add the preempting reservation's
2768          * struct t10_pr_registration to the list that will be compared
2769          * against received CDBs..
2770          */
2771         if (preempt_and_abort_list)
2772                 list_add_tail(&pr_reg->pr_reg_abort_list,
2773                                 preempt_and_abort_list);
2774 }
2775
2776 static void core_scsi3_release_preempt_and_abort(
2777         struct list_head *preempt_and_abort_list,
2778         struct t10_pr_registration *pr_reg_holder)
2779 {
2780         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2781
2782         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2783                                 pr_reg_abort_list) {
2784
2785                 list_del(&pr_reg->pr_reg_abort_list);
2786                 if (pr_reg_holder == pr_reg)
2787                         continue;
2788                 if (pr_reg->pr_res_holder) {
2789                         pr_warn("pr_reg->pr_res_holder still set\n");
2790                         continue;
2791                 }
2792
2793                 pr_reg->pr_reg_deve = NULL;
2794                 pr_reg->pr_reg_nacl = NULL;
2795                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2796         }
2797 }
2798
2799 static sense_reason_t
2800 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2801                 u64 sa_res_key, enum preempt_type preempt_type)
2802 {
2803         struct se_device *dev = cmd->se_dev;
2804         struct se_node_acl *pr_reg_nacl;
2805         struct se_session *se_sess = cmd->se_sess;
2806         LIST_HEAD(preempt_and_abort_list);
2807         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2808         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2809         u32 pr_res_mapped_lun = 0;
2810         int all_reg = 0, calling_it_nexus = 0;
2811         bool sa_res_key_unmatched = sa_res_key != 0;
2812         int prh_type = 0, prh_scope = 0;
2813
2814         if (!se_sess)
2815                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2816
2817         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2818                                 se_sess);
2819         if (!pr_reg_n) {
2820                 pr_err("SPC-3 PR: Unable to locate"
2821                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2822                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2823                 return TCM_RESERVATION_CONFLICT;
2824         }
2825         if (pr_reg_n->pr_res_key != res_key) {
2826                 core_scsi3_put_pr_reg(pr_reg_n);
2827                 return TCM_RESERVATION_CONFLICT;
2828         }
2829         if (scope != PR_SCOPE_LU_SCOPE) {
2830                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2831                 core_scsi3_put_pr_reg(pr_reg_n);
2832                 return TCM_INVALID_PARAMETER_LIST;
2833         }
2834
2835         spin_lock(&dev->dev_reservation_lock);
2836         pr_res_holder = dev->dev_pr_res_holder;
2837         if (pr_res_holder &&
2838            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2839             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2840                 all_reg = 1;
2841
2842         if (!all_reg && !sa_res_key) {
2843                 spin_unlock(&dev->dev_reservation_lock);
2844                 core_scsi3_put_pr_reg(pr_reg_n);
2845                 return TCM_INVALID_PARAMETER_LIST;
2846         }
2847         /*
2848          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2849          *
2850          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2851          * persistent reservation holder or there is no persistent reservation
2852          * holder (i.e., there is no persistent reservation), then the device
2853          * server shall perform a preempt by doing the following in an
2854          * uninterrupted series of actions. (See below..)
2855          */
2856         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2857                 /*
2858                  * No existing or SA Reservation Key matching reservations..
2859                  *
2860                  * PROUT SA PREEMPT with All Registrant type reservations are
2861                  * allowed to be processed without a matching SA Reservation Key
2862                  */
2863                 spin_lock(&pr_tmpl->registration_lock);
2864                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2865                                 &pr_tmpl->registration_list, pr_reg_list) {
2866                         /*
2867                          * Removing of registrations in non all registrants
2868                          * type reservations without a matching SA reservation
2869                          * key.
2870                          *
2871                          * a) Remove the registrations for all I_T nexuses
2872                          *    specified by the SERVICE ACTION RESERVATION KEY
2873                          *    field;
2874                          * b) Ignore the contents of the SCOPE and TYPE fields;
2875                          * c) Process tasks as defined in 5.7.1; and
2876                          * d) Establish a unit attention condition for the
2877                          *    initiator port associated with every I_T nexus
2878                          *    that lost its registration other than the I_T
2879                          *    nexus on which the PERSISTENT RESERVE OUT command
2880                          *    was received, with the additional sense code set
2881                          *    to REGISTRATIONS PREEMPTED.
2882                          */
2883                         if (!all_reg) {
2884                                 if (pr_reg->pr_res_key != sa_res_key)
2885                                         continue;
2886                                 sa_res_key_unmatched = false;
2887
2888                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2889                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2890                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2891                                 __core_scsi3_free_registration(dev, pr_reg,
2892                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2893                                                 NULL, calling_it_nexus);
2894                         } else {
2895                                 /*
2896                                  * Case for any existing all registrants type
2897                                  * reservation, follow logic in spc4r17 section
2898                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2899                                  *
2900                                  * For a ZERO SA Reservation key, release
2901                                  * all other registrations and do an implicit
2902                                  * release of active persistent reservation.
2903                                  *
2904                                  * For a non-ZERO SA Reservation key, only
2905                                  * release the matching reservation key from
2906                                  * registrations.
2907                                  */
2908                                 if ((sa_res_key) &&
2909                                      (pr_reg->pr_res_key != sa_res_key))
2910                                         continue;
2911                                 sa_res_key_unmatched = false;
2912
2913                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2914                                 if (calling_it_nexus)
2915                                         continue;
2916
2917                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2918                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2919                                 __core_scsi3_free_registration(dev, pr_reg,
2920                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2921                                                 NULL, 0);
2922                         }
2923                         if (!calling_it_nexus)
2924                                 core_scsi3_ua_allocate(pr_reg_nacl,
2925                                         pr_res_mapped_lun, 0x2A,
2926                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2927                 }
2928                 spin_unlock(&pr_tmpl->registration_lock);
2929                 /*
2930                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2931                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2932                  * RESERVATION KEY field to a value that does not match any
2933                  * registered reservation key, then the device server shall
2934                  * complete the command with RESERVATION CONFLICT status.
2935                  */
2936                 if (sa_res_key_unmatched) {
2937                         spin_unlock(&dev->dev_reservation_lock);
2938                         core_scsi3_put_pr_reg(pr_reg_n);
2939                         return TCM_RESERVATION_CONFLICT;
2940                 }
2941                 /*
2942                  * For an existing all registrants type reservation
2943                  * with a zero SA rservation key, preempt the existing
2944                  * reservation with the new PR type and scope.
2945                  */
2946                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2947                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2948                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2949                                 type, scope, preempt_type);
2950
2951                         if (preempt_type == PREEMPT_AND_ABORT)
2952                                 core_scsi3_release_preempt_and_abort(
2953                                         &preempt_and_abort_list, pr_reg_n);
2954                 }
2955                 spin_unlock(&dev->dev_reservation_lock);
2956
2957                 if (pr_tmpl->pr_aptpl_active)
2958                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2959
2960                 core_scsi3_put_pr_reg(pr_reg_n);
2961                 core_scsi3_pr_generation(cmd->se_dev);
2962                 return 0;
2963         }
2964         /*
2965          * The PREEMPTing SA reservation key matches that of the
2966          * existing persistent reservation, first, we check if
2967          * we are preempting our own reservation.
2968          * From spc4r17, section 5.7.11.4.3 Preempting
2969          * persistent reservations and registration handling
2970          *
2971          * If an all registrants persistent reservation is not
2972          * present, it is not an error for the persistent
2973          * reservation holder to preempt itself (i.e., a
2974          * PERSISTENT RESERVE OUT with a PREEMPT service action
2975          * or a PREEMPT AND ABORT service action with the
2976          * SERVICE ACTION RESERVATION KEY value equal to the
2977          * persistent reservation holder's reservation key that
2978          * is received from the persistent reservation holder).
2979          * In that case, the device server shall establish the
2980          * new persistent reservation and maintain the
2981          * registration.
2982          */
2983         prh_type = pr_res_holder->pr_res_type;
2984         prh_scope = pr_res_holder->pr_res_scope;
2985         /*
2986          * If the SERVICE ACTION RESERVATION KEY field identifies a
2987          * persistent reservation holder (see 5.7.10), the device
2988          * server shall perform a preempt by doing the following as
2989          * an uninterrupted series of actions:
2990          *
2991          * a) Release the persistent reservation for the holder
2992          *    identified by the SERVICE ACTION RESERVATION KEY field;
2993          */
2994         if (pr_reg_n != pr_res_holder)
2995                 __core_scsi3_complete_pro_release(dev,
2996                                                   pr_res_holder->pr_reg_nacl,
2997                                                   dev->dev_pr_res_holder, 0, 0);
2998         /*
2999          * b) Remove the registrations for all I_T nexuses identified
3000          *    by the SERVICE ACTION RESERVATION KEY field, except the
3001          *    I_T nexus that is being used for the PERSISTENT RESERVE
3002          *    OUT command. If an all registrants persistent reservation
3003          *    is present and the SERVICE ACTION RESERVATION KEY field
3004          *    is set to zero, then all registrations shall be removed
3005          *    except for that of the I_T nexus that is being used for
3006          *    the PERSISTENT RESERVE OUT command;
3007          */
3008         spin_lock(&pr_tmpl->registration_lock);
3009         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3010                         &pr_tmpl->registration_list, pr_reg_list) {
3011
3012                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3013                 if (calling_it_nexus)
3014                         continue;
3015
3016                 if (pr_reg->pr_res_key != sa_res_key)
3017                         continue;
3018
3019                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3020                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3021                 __core_scsi3_free_registration(dev, pr_reg,
3022                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3023                                 calling_it_nexus);
3024                 /*
3025                  * e) Establish a unit attention condition for the initiator
3026                  *    port associated with every I_T nexus that lost its
3027                  *    persistent reservation and/or registration, with the
3028                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3029                  */
3030                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3031                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3032         }
3033         spin_unlock(&pr_tmpl->registration_lock);
3034         /*
3035          * c) Establish a persistent reservation for the preempting
3036          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3037          */
3038         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3039                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3040                         type, scope, preempt_type);
3041         /*
3042          * d) Process tasks as defined in 5.7.1;
3043          * e) See above..
3044          * f) If the type or scope has changed, then for every I_T nexus
3045          *    whose reservation key was not removed, except for the I_T
3046          *    nexus on which the PERSISTENT RESERVE OUT command was
3047          *    received, the device server shall establish a unit
3048          *    attention condition for the initiator port associated with
3049          *    that I_T nexus, with the additional sense code set to
3050          *    RESERVATIONS RELEASED. If the type or scope have not
3051          *    changed, then no unit attention condition(s) shall be
3052          *    established for this reason.
3053          */
3054         if ((prh_type != type) || (prh_scope != scope)) {
3055                 spin_lock(&pr_tmpl->registration_lock);
3056                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3057                                 &pr_tmpl->registration_list, pr_reg_list) {
3058
3059                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3060                         if (calling_it_nexus)
3061                                 continue;
3062
3063                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3064                                         pr_reg->pr_res_mapped_lun, 0x2A,
3065                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3066                 }
3067                 spin_unlock(&pr_tmpl->registration_lock);
3068         }
3069         spin_unlock(&dev->dev_reservation_lock);
3070         /*
3071          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3072          * All received CDBs for the matching existing reservation and
3073          * registrations undergo ABORT_TASK logic.
3074          *
3075          * From there, core_scsi3_release_preempt_and_abort() will
3076          * release every registration in the list (which have already
3077          * been removed from the primary pr_reg list), except the
3078          * new persistent reservation holder, the calling Initiator Port.
3079          */
3080         if (preempt_type == PREEMPT_AND_ABORT) {
3081                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3082                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3083                                                 pr_reg_n);
3084         }
3085
3086         if (pr_tmpl->pr_aptpl_active)
3087                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3088
3089         core_scsi3_put_pr_reg(pr_reg_n);
3090         core_scsi3_pr_generation(cmd->se_dev);
3091         return 0;
3092 }
3093
3094 static sense_reason_t
3095 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3096                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3097 {
3098         switch (type) {
3099         case PR_TYPE_WRITE_EXCLUSIVE:
3100         case PR_TYPE_EXCLUSIVE_ACCESS:
3101         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3102         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3103         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3104         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3105                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3106                                               sa_res_key, preempt_type);
3107         default:
3108                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3109                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3110                 return TCM_INVALID_CDB_FIELD;
3111         }
3112 }
3113
3114
3115 static sense_reason_t
3116 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3117                 u64 sa_res_key, int aptpl, int unreg)
3118 {
3119         struct se_session *se_sess = cmd->se_sess;
3120         struct se_device *dev = cmd->se_dev;
3121         struct se_dev_entry *dest_se_deve = NULL;
3122         struct se_lun *se_lun = cmd->se_lun;
3123         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3124         struct se_port *se_port;
3125         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3126         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3127         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3128         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3129         unsigned char *buf;
3130         const unsigned char *initiator_str;
3131         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3132         u32 tid_len, tmp_tid_len;
3133         int new_reg = 0, type, scope, matching_iname;
3134         sense_reason_t ret;
3135         unsigned short rtpi;
3136         unsigned char proto_ident;
3137
3138         if (!se_sess || !se_lun) {
3139                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3140                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3141         }
3142
3143         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3144         se_tpg = se_sess->se_tpg;
3145         tf_ops = se_tpg->se_tpg_tfo;
3146         /*
3147          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3148          *      Register behaviors for a REGISTER AND MOVE service action
3149          *
3150          * Locate the existing *pr_reg via struct se_node_acl pointers
3151          */
3152         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3153                                 se_sess);
3154         if (!pr_reg) {
3155                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3156                         " *pr_reg for REGISTER_AND_MOVE\n");
3157                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3158         }
3159         /*
3160          * The provided reservation key much match the existing reservation key
3161          * provided during this initiator's I_T nexus registration.
3162          */
3163         if (res_key != pr_reg->pr_res_key) {
3164                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3165                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3166                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3167                 ret = TCM_RESERVATION_CONFLICT;
3168                 goto out_put_pr_reg;
3169         }
3170         /*
3171          * The service active reservation key needs to be non zero
3172          */
3173         if (!sa_res_key) {
3174                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3175                         " sa_res_key\n");
3176                 ret = TCM_INVALID_PARAMETER_LIST;
3177                 goto out_put_pr_reg;
3178         }
3179
3180         /*
3181          * Determine the Relative Target Port Identifier where the reservation
3182          * will be moved to for the TransportID containing SCSI initiator WWN
3183          * information.
3184          */
3185         buf = transport_kmap_data_sg(cmd);
3186         if (!buf) {
3187                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3188                 goto out_put_pr_reg;
3189         }
3190
3191         rtpi = (buf[18] & 0xff) << 8;
3192         rtpi |= buf[19] & 0xff;
3193         tid_len = (buf[20] & 0xff) << 24;
3194         tid_len |= (buf[21] & 0xff) << 16;
3195         tid_len |= (buf[22] & 0xff) << 8;
3196         tid_len |= buf[23] & 0xff;
3197         transport_kunmap_data_sg(cmd);
3198         buf = NULL;
3199
3200         if ((tid_len + 24) != cmd->data_length) {
3201                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3202                         " does not equal CDB data_length: %u\n", tid_len,
3203                         cmd->data_length);
3204                 ret = TCM_INVALID_PARAMETER_LIST;
3205                 goto out_put_pr_reg;
3206         }
3207
3208         spin_lock(&dev->se_port_lock);
3209         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3210                 if (se_port->sep_rtpi != rtpi)
3211                         continue;
3212                 dest_se_tpg = se_port->sep_tpg;
3213                 if (!dest_se_tpg)
3214                         continue;
3215                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3216                 if (!dest_tf_ops)
3217                         continue;
3218
3219                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3220                 spin_unlock(&dev->se_port_lock);
3221
3222                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3223                         pr_err("core_scsi3_tpg_depend_item() failed"
3224                                 " for dest_se_tpg\n");
3225                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3226                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3227                         goto out_put_pr_reg;
3228                 }
3229
3230                 spin_lock(&dev->se_port_lock);
3231                 break;
3232         }
3233         spin_unlock(&dev->se_port_lock);
3234
3235         if (!dest_se_tpg || !dest_tf_ops) {
3236                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3237                         " fabric ops from Relative Target Port Identifier:"
3238                         " %hu\n", rtpi);
3239                 ret = TCM_INVALID_PARAMETER_LIST;
3240                 goto out_put_pr_reg;
3241         }
3242
3243         buf = transport_kmap_data_sg(cmd);
3244         if (!buf) {
3245                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3246                 goto out_put_pr_reg;
3247         }
3248         proto_ident = (buf[24] & 0x0f);
3249
3250         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3251                         " 0x%02x\n", proto_ident);
3252
3253         if (proto_ident != dest_se_tpg->proto_id) {
3254                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3255                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3256                         " from fabric: %s\n", proto_ident,
3257                         dest_se_tpg->proto_id,
3258                         dest_tf_ops->get_fabric_name());
3259                 ret = TCM_INVALID_PARAMETER_LIST;
3260                 goto out;
3261         }
3262         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3263                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3264         if (!initiator_str) {
3265                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3266                         " initiator_str from Transport ID\n");
3267                 ret = TCM_INVALID_PARAMETER_LIST;
3268                 goto out;
3269         }
3270
3271         transport_kunmap_data_sg(cmd);
3272         buf = NULL;
3273
3274         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3275                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3276                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3277                 iport_ptr : "");
3278         /*
3279          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3280          * action specifies a TransportID that is the same as the initiator port
3281          * of the I_T nexus for the command received, then the command shall
3282          * be terminated with CHECK CONDITION status, with the sense key set to
3283          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3284          * IN PARAMETER LIST.
3285          */
3286         pr_reg_nacl = pr_reg->pr_reg_nacl;
3287         matching_iname = (!strcmp(initiator_str,
3288                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3289         if (!matching_iname)
3290                 goto after_iport_check;
3291
3292         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3293                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3294                         " matches: %s on received I_T Nexus\n", initiator_str,
3295                         pr_reg_nacl->initiatorname);
3296                 ret = TCM_INVALID_PARAMETER_LIST;
3297                 goto out;
3298         }
3299         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3300                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3301                         " matches: %s %s on received I_T Nexus\n",
3302                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3303                         pr_reg->pr_reg_isid);
3304                 ret = TCM_INVALID_PARAMETER_LIST;
3305                 goto out;
3306         }
3307 after_iport_check:
3308         /*
3309          * Locate the destination struct se_node_acl from the received Transport ID
3310          */
3311         mutex_lock(&dest_se_tpg->acl_node_mutex);
3312         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3313                                 initiator_str);
3314         if (dest_node_acl)
3315                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3316         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3317
3318         if (!dest_node_acl) {
3319                 pr_err("Unable to locate %s dest_node_acl for"
3320                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3321                         initiator_str);
3322                 ret = TCM_INVALID_PARAMETER_LIST;
3323                 goto out;
3324         }
3325
3326         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3327                 pr_err("core_scsi3_nodeacl_depend_item() for"
3328                         " dest_node_acl\n");
3329                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3330                 dest_node_acl = NULL;
3331                 ret = TCM_INVALID_PARAMETER_LIST;
3332                 goto out;
3333         }
3334
3335         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3336                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3337                 dest_node_acl->initiatorname);
3338
3339         /*
3340          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3341          * PORT IDENTIFIER.
3342          */
3343         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3344         if (!dest_se_deve) {
3345                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3346                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3347                 ret = TCM_INVALID_PARAMETER_LIST;
3348                 goto out;
3349         }
3350
3351         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3352                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3353                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3354                 dest_se_deve = NULL;
3355                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3356                 goto out;
3357         }
3358
3359         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3360                 " ACL for dest_se_deve->mapped_lun: %u\n",
3361                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3362                 dest_se_deve->mapped_lun);
3363
3364         /*
3365          * A persistent reservation needs to already existing in order to
3366          * successfully complete the REGISTER_AND_MOVE service action..
3367          */
3368         spin_lock(&dev->dev_reservation_lock);
3369         pr_res_holder = dev->dev_pr_res_holder;
3370         if (!pr_res_holder) {
3371                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3372                         " currently held\n");
3373                 spin_unlock(&dev->dev_reservation_lock);
3374                 ret = TCM_INVALID_CDB_FIELD;
3375                 goto out;
3376         }
3377         /*
3378          * The received on I_T Nexus must be the reservation holder.
3379          *
3380          * From spc4r17 section 5.7.8  Table 50 --
3381          *      Register behaviors for a REGISTER AND MOVE service action
3382          */
3383         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3384                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3385                         " Nexus is not reservation holder\n");
3386                 spin_unlock(&dev->dev_reservation_lock);
3387                 ret = TCM_RESERVATION_CONFLICT;
3388                 goto out;
3389         }
3390         /*
3391          * From spc4r17 section 5.7.8: registering and moving reservation
3392          *
3393          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3394          * action is received and the established persistent reservation is a
3395          * Write Exclusive - All Registrants type or Exclusive Access -
3396          * All Registrants type reservation, then the command shall be completed
3397          * with RESERVATION CONFLICT status.
3398          */
3399         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3400             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3401                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3402                         " reservation for type: %s\n",
3403                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3404                 spin_unlock(&dev->dev_reservation_lock);
3405                 ret = TCM_RESERVATION_CONFLICT;
3406                 goto out;
3407         }
3408         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3409         /*
3410          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3411          */
3412         type = pr_res_holder->pr_res_type;
3413         scope = pr_res_holder->pr_res_type;
3414         /*
3415          * c) Associate the reservation key specified in the SERVICE ACTION
3416          *    RESERVATION KEY field with the I_T nexus specified as the
3417          *    destination of the register and move, where:
3418          *    A) The I_T nexus is specified by the TransportID and the
3419          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3420          *    B) Regardless of the TransportID format used, the association for
3421          *       the initiator port is based on either the initiator port name
3422          *       (see 3.1.71) on SCSI transport protocols where port names are
3423          *       required or the initiator port identifier (see 3.1.70) on SCSI
3424          *       transport protocols where port names are not required;
3425          * d) Register the reservation key specified in the SERVICE ACTION
3426          *    RESERVATION KEY field;
3427          * e) Retain the reservation key specified in the SERVICE ACTION
3428          *    RESERVATION KEY field and associated information;
3429          *
3430          * Also, It is not an error for a REGISTER AND MOVE service action to
3431          * register an I_T nexus that is already registered with the same
3432          * reservation key or a different reservation key.
3433          */
3434         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3435                                         iport_ptr);
3436         if (!dest_pr_reg) {
3437                 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3438                                 atomic_read(&dest_se_deve->pr_kref.refcount) != 0);
3439
3440                 spin_unlock(&dev->dev_reservation_lock);
3441                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3442                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3443                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3444                         ret = TCM_INVALID_PARAMETER_LIST;
3445                         goto out;
3446                 }
3447                 spin_lock(&dev->dev_reservation_lock);
3448                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3449                                                 iport_ptr);
3450                 new_reg = 1;
3451         }
3452         /*
3453          * f) Release the persistent reservation for the persistent reservation
3454          *    holder (i.e., the I_T nexus on which the
3455          */
3456         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3457                                           dev->dev_pr_res_holder, 0, 0);
3458         /*
3459          * g) Move the persistent reservation to the specified I_T nexus using
3460          *    the same scope and type as the persistent reservation released in
3461          *    item f); and
3462          */
3463         dev->dev_pr_res_holder = dest_pr_reg;
3464         dest_pr_reg->pr_res_holder = 1;
3465         dest_pr_reg->pr_res_type = type;
3466         pr_reg->pr_res_scope = scope;
3467         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3468         /*
3469          * Increment PRGeneration for existing registrations..
3470          */
3471         if (!new_reg)
3472                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3473         spin_unlock(&dev->dev_reservation_lock);
3474
3475         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3476                 " created new reservation holder TYPE: %s on object RTPI:"
3477                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3478                 core_scsi3_pr_dump_type(type), rtpi,
3479                 dest_pr_reg->pr_res_generation);
3480         pr_debug("SPC-3 PR Successfully moved reservation from"
3481                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3482                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3483                 i_buf, dest_tf_ops->get_fabric_name(),
3484                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3485                 iport_ptr : "");
3486         /*
3487          * It is now safe to release configfs group dependencies for destination
3488          * of Transport ID Initiator Device/Port Identifier
3489          */
3490         core_scsi3_lunacl_undepend_item(dest_se_deve);
3491         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3492         core_scsi3_tpg_undepend_item(dest_se_tpg);
3493         /*
3494          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3495          * nexus on which PERSISTENT RESERVE OUT command was received.
3496          */
3497         if (unreg) {
3498                 spin_lock(&pr_tmpl->registration_lock);
3499                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3500                 spin_unlock(&pr_tmpl->registration_lock);
3501         } else
3502                 core_scsi3_put_pr_reg(pr_reg);
3503
3504         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3505
3506         transport_kunmap_data_sg(cmd);
3507
3508         core_scsi3_put_pr_reg(dest_pr_reg);
3509         return 0;
3510 out:
3511         if (buf)
3512                 transport_kunmap_data_sg(cmd);
3513         if (dest_se_deve)
3514                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3515         if (dest_node_acl)
3516                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3517         core_scsi3_tpg_undepend_item(dest_se_tpg);
3518
3519 out_put_pr_reg:
3520         core_scsi3_put_pr_reg(pr_reg);
3521         return ret;
3522 }
3523
3524 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3525 {
3526         unsigned int __v1, __v2;
3527
3528         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3529         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3530
3531         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3532 }
3533
3534 /*
3535  * See spc4r17 section 6.14 Table 170
3536  */
3537 sense_reason_t
3538 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3539 {
3540         struct se_device *dev = cmd->se_dev;
3541         unsigned char *cdb = &cmd->t_task_cdb[0];
3542         unsigned char *buf;
3543         u64 res_key, sa_res_key;
3544         int sa, scope, type, aptpl;
3545         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3546         sense_reason_t ret;
3547
3548         /*
3549          * Following spc2r20 5.5.1 Reservations overview:
3550          *
3551          * If a logical unit has been reserved by any RESERVE command and is
3552          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3553          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3554          * initiator or service action and shall terminate with a RESERVATION
3555          * CONFLICT status.
3556          */
3557         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3558                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3559                         " SPC-2 reservation is held, returning"
3560                         " RESERVATION_CONFLICT\n");
3561                 return TCM_RESERVATION_CONFLICT;
3562         }
3563
3564         /*
3565          * FIXME: A NULL struct se_session pointer means an this is not coming from
3566          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3567          */
3568         if (!cmd->se_sess)
3569                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3570
3571         if (cmd->data_length < 24) {
3572                 pr_warn("SPC-PR: Received PR OUT parameter list"
3573                         " length too small: %u\n", cmd->data_length);
3574                 return TCM_INVALID_PARAMETER_LIST;
3575         }
3576
3577         /*
3578          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3579          */
3580         sa = (cdb[1] & 0x1f);
3581         scope = (cdb[2] & 0xf0);
3582         type = (cdb[2] & 0x0f);
3583
3584         buf = transport_kmap_data_sg(cmd);
3585         if (!buf)
3586                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3587
3588         /*
3589          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3590          */
3591         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3592         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3593         /*
3594          * REGISTER_AND_MOVE uses a different SA parameter list containing
3595          * SCSI TransportIDs.
3596          */
3597         if (sa != PRO_REGISTER_AND_MOVE) {
3598                 spec_i_pt = (buf[20] & 0x08);
3599                 all_tg_pt = (buf[20] & 0x04);
3600                 aptpl = (buf[20] & 0x01);
3601         } else {
3602                 aptpl = (buf[17] & 0x01);
3603                 unreg = (buf[17] & 0x02);
3604         }
3605         /*
3606          * If the backend device has been configured to force APTPL metadata
3607          * write-out, go ahead and propigate aptpl=1 down now.
3608          */
3609         if (dev->dev_attrib.force_pr_aptpl)
3610                 aptpl = 1;
3611
3612         transport_kunmap_data_sg(cmd);
3613         buf = NULL;
3614
3615         /*
3616          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3617          */
3618         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3619                 return TCM_INVALID_PARAMETER_LIST;
3620
3621         /*
3622          * From spc4r17 section 6.14:
3623          *
3624          * If the SPEC_I_PT bit is set to zero, the service action is not
3625          * REGISTER AND MOVE, and the parameter list length is not 24, then
3626          * the command shall be terminated with CHECK CONDITION status, with
3627          * the sense key set to ILLEGAL REQUEST, and the additional sense
3628          * code set to PARAMETER LIST LENGTH ERROR.
3629          */
3630         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3631             (cmd->data_length != 24)) {
3632                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3633                         " list length: %u\n", cmd->data_length);
3634                 return TCM_INVALID_PARAMETER_LIST;
3635         }
3636
3637         /*
3638          * (core_scsi3_emulate_pro_* function parameters
3639          * are defined by spc4r17 Table 174:
3640          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3641          */
3642         switch (sa) {
3643         case PRO_REGISTER:
3644                 ret = core_scsi3_emulate_pro_register(cmd,
3645                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3646                 break;
3647         case PRO_RESERVE:
3648                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3649                 break;
3650         case PRO_RELEASE:
3651                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3652                 break;
3653         case PRO_CLEAR:
3654                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3655                 break;
3656         case PRO_PREEMPT:
3657                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3658                                         res_key, sa_res_key, PREEMPT);
3659                 break;
3660         case PRO_PREEMPT_AND_ABORT:
3661                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3662                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3663                 break;
3664         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3665                 ret = core_scsi3_emulate_pro_register(cmd,
3666                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3667                 break;
3668         case PRO_REGISTER_AND_MOVE:
3669                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3670                                 sa_res_key, aptpl, unreg);
3671                 break;
3672         default:
3673                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3674                         " action: 0x%02x\n", cdb[1] & 0x1f);
3675                 return TCM_INVALID_CDB_FIELD;
3676         }
3677
3678         if (!ret)
3679                 target_complete_cmd(cmd, GOOD);
3680         return ret;
3681 }
3682
3683 /*
3684  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3685  *
3686  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3687  */
3688 static sense_reason_t
3689 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3690 {
3691         struct se_device *dev = cmd->se_dev;
3692         struct t10_pr_registration *pr_reg;
3693         unsigned char *buf;
3694         u32 add_len = 0, off = 8;
3695
3696         if (cmd->data_length < 8) {
3697                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3698                         " too small\n", cmd->data_length);
3699                 return TCM_INVALID_CDB_FIELD;
3700         }
3701
3702         buf = transport_kmap_data_sg(cmd);
3703         if (!buf)
3704                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3705
3706         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3707         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3708         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3709         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3710
3711         spin_lock(&dev->t10_pr.registration_lock);
3712         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3713                         pr_reg_list) {
3714                 /*
3715                  * Check for overflow of 8byte PRI READ_KEYS payload and
3716                  * next reservation key list descriptor.
3717                  */
3718                 if ((add_len + 8) > (cmd->data_length - 8))
3719                         break;
3720
3721                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3722                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3723                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3724                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3725                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3726                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3727                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3728                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3729
3730                 add_len += 8;
3731         }
3732         spin_unlock(&dev->t10_pr.registration_lock);
3733
3734         buf[4] = ((add_len >> 24) & 0xff);
3735         buf[5] = ((add_len >> 16) & 0xff);
3736         buf[6] = ((add_len >> 8) & 0xff);
3737         buf[7] = (add_len & 0xff);
3738
3739         transport_kunmap_data_sg(cmd);
3740
3741         return 0;
3742 }
3743
3744 /*
3745  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3746  *
3747  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3748  */
3749 static sense_reason_t
3750 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3751 {
3752         struct se_device *dev = cmd->se_dev;
3753         struct t10_pr_registration *pr_reg;
3754         unsigned char *buf;
3755         u64 pr_res_key;
3756         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3757
3758         if (cmd->data_length < 8) {
3759                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3760                         " too small\n", cmd->data_length);
3761                 return TCM_INVALID_CDB_FIELD;
3762         }
3763
3764         buf = transport_kmap_data_sg(cmd);
3765         if (!buf)
3766                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3767
3768         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3769         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3770         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3771         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3772
3773         spin_lock(&dev->dev_reservation_lock);
3774         pr_reg = dev->dev_pr_res_holder;
3775         if (pr_reg) {
3776                 /*
3777                  * Set the hardcoded Additional Length
3778                  */
3779                 buf[4] = ((add_len >> 24) & 0xff);
3780                 buf[5] = ((add_len >> 16) & 0xff);
3781                 buf[6] = ((add_len >> 8) & 0xff);
3782                 buf[7] = (add_len & 0xff);
3783
3784                 if (cmd->data_length < 22)
3785                         goto err;
3786
3787                 /*
3788                  * Set the Reservation key.
3789                  *
3790                  * From spc4r17, section 5.7.10:
3791                  * A persistent reservation holder has its reservation key
3792                  * returned in the parameter data from a PERSISTENT
3793                  * RESERVE IN command with READ RESERVATION service action as
3794                  * follows:
3795                  * a) For a persistent reservation of the type Write Exclusive
3796                  *    - All Registrants or Exclusive Access  All Regitrants,
3797                  *      the reservation key shall be set to zero; or
3798                  * b) For all other persistent reservation types, the
3799                  *    reservation key shall be set to the registered
3800                  *    reservation key for the I_T nexus that holds the
3801                  *    persistent reservation.
3802                  */
3803                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3804                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3805                         pr_res_key = 0;
3806                 else
3807                         pr_res_key = pr_reg->pr_res_key;
3808
3809                 buf[8] = ((pr_res_key >> 56) & 0xff);
3810                 buf[9] = ((pr_res_key >> 48) & 0xff);
3811                 buf[10] = ((pr_res_key >> 40) & 0xff);
3812                 buf[11] = ((pr_res_key >> 32) & 0xff);
3813                 buf[12] = ((pr_res_key >> 24) & 0xff);
3814                 buf[13] = ((pr_res_key >> 16) & 0xff);
3815                 buf[14] = ((pr_res_key >> 8) & 0xff);
3816                 buf[15] = (pr_res_key & 0xff);
3817                 /*
3818                  * Set the SCOPE and TYPE
3819                  */
3820                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3821                           (pr_reg->pr_res_type & 0x0f);
3822         }
3823
3824 err:
3825         spin_unlock(&dev->dev_reservation_lock);
3826         transport_kunmap_data_sg(cmd);
3827
3828         return 0;
3829 }
3830
3831 /*
3832  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3833  *
3834  * See spc4r17 section 6.13.4 Table 165
3835  */
3836 static sense_reason_t
3837 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3838 {
3839         struct se_device *dev = cmd->se_dev;
3840         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3841         unsigned char *buf;
3842         u16 add_len = 8; /* Hardcoded to 8. */
3843
3844         if (cmd->data_length < 6) {
3845                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3846                         " %u too small\n", cmd->data_length);
3847                 return TCM_INVALID_CDB_FIELD;
3848         }
3849
3850         buf = transport_kmap_data_sg(cmd);
3851         if (!buf)
3852                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3853
3854         buf[0] = ((add_len >> 8) & 0xff);
3855         buf[1] = (add_len & 0xff);
3856         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3857         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3858         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3859         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3860         /*
3861          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3862          * set the TMV: Task Mask Valid bit.
3863          */
3864         buf[3] |= 0x80;
3865         /*
3866          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3867          */
3868         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3869         /*
3870          * PTPL_A: Persistence across Target Power Loss Active bit
3871          */
3872         if (pr_tmpl->pr_aptpl_active)
3873                 buf[3] |= 0x01;
3874         /*
3875          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3876          */
3877         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3878         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3879         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3880         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3881         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3882         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3883
3884         transport_kunmap_data_sg(cmd);
3885
3886         return 0;
3887 }
3888
3889 /*
3890  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3891  *
3892  * See spc4r17 section 6.13.5 Table 168 and 169
3893  */
3894 static sense_reason_t
3895 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3896 {
3897         struct se_device *dev = cmd->se_dev;
3898         struct se_node_acl *se_nacl;
3899         struct se_portal_group *se_tpg;
3900         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3901         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3902         unsigned char *buf;
3903         u32 add_desc_len = 0, add_len = 0;
3904         u32 off = 8; /* off into first Full Status descriptor */
3905         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3906         int exp_desc_len, desc_len;
3907         bool all_reg = false;
3908
3909         if (cmd->data_length < 8) {
3910                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3911                         " too small\n", cmd->data_length);
3912                 return TCM_INVALID_CDB_FIELD;
3913         }
3914
3915         buf = transport_kmap_data_sg(cmd);
3916         if (!buf)
3917                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3918
3919         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3920         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3921         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3922         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3923
3924         spin_lock(&dev->dev_reservation_lock);
3925         if (dev->dev_pr_res_holder) {
3926                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3927
3928                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3929                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3930                         all_reg = true;
3931                         pr_res_type = pr_holder->pr_res_type;
3932                         pr_res_scope = pr_holder->pr_res_scope;
3933                 }
3934         }
3935         spin_unlock(&dev->dev_reservation_lock);
3936
3937         spin_lock(&pr_tmpl->registration_lock);
3938         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3939                         &pr_tmpl->registration_list, pr_reg_list) {
3940
3941                 se_nacl = pr_reg->pr_reg_nacl;
3942                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3943                 add_desc_len = 0;
3944
3945                 atomic_inc_mb(&pr_reg->pr_res_holders);
3946                 spin_unlock(&pr_tmpl->registration_lock);
3947                 /*
3948                  * Determine expected length of $FABRIC_MOD specific
3949                  * TransportID full status descriptor..
3950                  */
3951                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3952                                         &format_code);
3953                 if (exp_desc_len < 0 ||
3954                     exp_desc_len + add_len > cmd->data_length) {
3955                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3956                                 " out of buffer: %d\n", cmd->data_length);
3957                         spin_lock(&pr_tmpl->registration_lock);
3958                         atomic_dec_mb(&pr_reg->pr_res_holders);
3959                         break;
3960                 }
3961                 /*
3962                  * Set RESERVATION KEY
3963                  */
3964                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3965                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3966                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3967                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3968                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3969                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3970                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3971                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3972                 off += 4; /* Skip Over Reserved area */
3973
3974                 /*
3975                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3976                  */
3977                 if (pr_reg->pr_reg_all_tg_pt)
3978                         buf[off] = 0x02;
3979                 /*
3980                  * The struct se_lun pointer will be present for the
3981                  * reservation holder for PR_HOLDER bit.
3982                  *
3983                  * Also, if this registration is the reservation
3984                  * holder or there is an All Registrants reservation
3985                  * active, fill in SCOPE and TYPE in the next byte.
3986                  */
3987                 if (pr_reg->pr_res_holder) {
3988                         buf[off++] |= 0x01;
3989                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3990                                      (pr_reg->pr_res_type & 0x0f);
3991                 } else if (all_reg) {
3992                         buf[off++] |= 0x01;
3993                         buf[off++] = (pr_res_scope & 0xf0) |
3994                                      (pr_res_type & 0x0f);
3995                 } else {
3996                         off += 2;
3997                 }
3998
3999                 off += 4; /* Skip over reserved area */
4000                 /*
4001                  * From spc4r17 6.3.15:
4002                  *
4003                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4004                  * IDENTIFIER field contains the relative port identifier (see
4005                  * 3.1.120) of the target port that is part of the I_T nexus
4006                  * described by this full status descriptor. If the ALL_TG_PT
4007                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4008                  * IDENTIFIER field are not defined by this standard.
4009                  */
4010                 if (!pr_reg->pr_reg_all_tg_pt) {
4011                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
4012
4013                         buf[off++] = ((sep_rtpi >> 8) & 0xff);
4014                         buf[off++] = (sep_rtpi & 0xff);
4015                 } else
4016                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4017
4018                 buf[off+4] = se_tpg->proto_id;
4019
4020                 /*
4021                  * Now, have the $FABRIC_MOD fill in the transport ID.
4022                  */
4023                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4024                                 &format_code, &buf[off+4]);
4025
4026                 spin_lock(&pr_tmpl->registration_lock);
4027                 atomic_dec_mb(&pr_reg->pr_res_holders);
4028
4029                 if (desc_len < 0)
4030                         break;
4031                 /*
4032                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4033                  */
4034                 buf[off++] = ((desc_len >> 24) & 0xff);
4035                 buf[off++] = ((desc_len >> 16) & 0xff);
4036                 buf[off++] = ((desc_len >> 8) & 0xff);
4037                 buf[off++] = (desc_len & 0xff);
4038                 /*
4039                  * Size of full desctipor header minus TransportID
4040                  * containing $FABRIC_MOD specific) initiator device/port
4041                  * WWN information.
4042                  *
4043                  *  See spc4r17 Section 6.13.5 Table 169
4044                  */
4045                 add_desc_len = (24 + desc_len);
4046
4047                 off += desc_len;
4048                 add_len += add_desc_len;
4049         }
4050         spin_unlock(&pr_tmpl->registration_lock);
4051         /*
4052          * Set ADDITIONAL_LENGTH
4053          */
4054         buf[4] = ((add_len >> 24) & 0xff);
4055         buf[5] = ((add_len >> 16) & 0xff);
4056         buf[6] = ((add_len >> 8) & 0xff);
4057         buf[7] = (add_len & 0xff);
4058
4059         transport_kunmap_data_sg(cmd);
4060
4061         return 0;
4062 }
4063
4064 sense_reason_t
4065 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4066 {
4067         sense_reason_t ret;
4068
4069         /*
4070          * Following spc2r20 5.5.1 Reservations overview:
4071          *
4072          * If a logical unit has been reserved by any RESERVE command and is
4073          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4074          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4075          * initiator or service action and shall terminate with a RESERVATION
4076          * CONFLICT status.
4077          */
4078         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4079                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4080                         " SPC-2 reservation is held, returning"
4081                         " RESERVATION_CONFLICT\n");
4082                 return TCM_RESERVATION_CONFLICT;
4083         }
4084
4085         switch (cmd->t_task_cdb[1] & 0x1f) {
4086         case PRI_READ_KEYS:
4087                 ret = core_scsi3_pri_read_keys(cmd);
4088                 break;
4089         case PRI_READ_RESERVATION:
4090                 ret = core_scsi3_pri_read_reservation(cmd);
4091                 break;
4092         case PRI_REPORT_CAPABILITIES:
4093                 ret = core_scsi3_pri_report_capabilities(cmd);
4094                 break;
4095         case PRI_READ_FULL_STATUS:
4096                 ret = core_scsi3_pri_read_full_status(cmd);
4097                 break;
4098         default:
4099                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4100                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4101                 return TCM_INVALID_CDB_FIELD;
4102         }
4103
4104         if (!ret)
4105                 target_complete_cmd(cmd, GOOD);
4106         return ret;
4107 }
4108
4109 sense_reason_t
4110 target_check_reservation(struct se_cmd *cmd)
4111 {
4112         struct se_device *dev = cmd->se_dev;
4113         sense_reason_t ret;
4114
4115         if (!cmd->se_sess)
4116                 return 0;
4117         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4118                 return 0;
4119         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
4120                 return 0;
4121
4122         spin_lock(&dev->dev_reservation_lock);
4123         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4124                 ret = target_scsi2_reservation_check(cmd);
4125         else
4126                 ret = target_scsi3_pr_reservation_check(cmd);
4127         spin_unlock(&dev->dev_reservation_lock);
4128
4129         return ret;
4130 }