drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * (c) Copyright 2009-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/file.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/fs.h>
  34 #include <scsi/scsi_proto.h>
  35 #include <asm/unaligned.h>
  36
  37 #include <target/target_core_base.h>
  38 #include <target/target_core_backend.h>
  39 #include <target/target_core_fabric.h>
  40
  41 #include "target_core_internal.h"
  42 #include "target_core_pr.h"
  43 #include "target_core_ua.h"
  44
  45 /*
  46  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  47  */
  48 struct pr_transport_id_holder {
  49         struct t10_pr_registration *dest_pr_reg;
  50         struct se_portal_group *dest_tpg;
  51         struct se_node_acl *dest_node_acl;
  52         struct se_dev_entry *dest_se_deve;
  53         struct list_head dest_list;
  54 };
  55
  56 void core_pr_dump_initiator_port(
  57         struct t10_pr_registration *pr_reg,
  58         char *buf,
  59         u32 size)
  60 {
  61         if (!pr_reg->isid_present_at_reg)
  62                 buf[0] = '\0';
  63
  64         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  65 }
  66
  67 enum register_type {
  68         REGISTER,
  69         REGISTER_AND_IGNORE_EXISTING_KEY,
  70         REGISTER_AND_MOVE,
  71 };
  72
  73 enum preempt_type {
  74         PREEMPT,
  75         PREEMPT_AND_ABORT,
  76 };
  77
  78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  79                                               struct t10_pr_registration *, int, int);
  80
  81 static int is_reservation_holder(
  82         struct t10_pr_registration *pr_res_holder,
  83         struct t10_pr_registration *pr_reg)
  84 {
  85         int pr_res_type;
  86
  87         if (pr_res_holder) {
  88                 pr_res_type = pr_res_holder->pr_res_type;
  89
  90                 return pr_res_holder == pr_reg ||
  91                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  92                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  93         }
  94         return 0;
  95 }
  96
  97 static sense_reason_t
  98 target_scsi2_reservation_check(struct se_cmd *cmd)
  99 {
 100         struct se_device *dev = cmd->se_dev;
 101         struct se_session *sess = cmd->se_sess;
 102
 103         switch (cmd->t_task_cdb[0]) {
 104         case INQUIRY:
 105         case RELEASE:
 106         case RELEASE_10:
 107                 return 0;
 108         default:
 109                 break;
 110         }
 111
 112         if (!dev->dev_reserved_node_acl || !sess)
 113                 return 0;
 114
 115         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 116                 return TCM_RESERVATION_CONFLICT;
 117
 118         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 119                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 120                         return TCM_RESERVATION_CONFLICT;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 127                                         struct se_node_acl *, struct se_session *);
 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 129
 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 131 {
 132         struct se_session *se_sess = cmd->se_sess;
 133         struct se_device *dev = cmd->se_dev;
 134         struct t10_pr_registration *pr_reg;
 135         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 136         int conflict = 0;
 137
 138         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 139                         se_sess);
 140         if (pr_reg) {
 141                 /*
 142                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 143                  * behavior
 144                  *
 145                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 146                  * status, but no reservation shall be established and the
 147                  * persistent reservation shall not be changed, if the command
 148                  * is received from a) and b) below.
 149                  *
 150                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 151                  * status, but the persistent reservation shall not be released,
 152                  * if the command is received from a) and b)
 153                  *
 154                  * a) An I_T nexus that is a persistent reservation holder; or
 155                  * b) An I_T nexus that is registered if a registrants only or
 156                  *    all registrants type persistent reservation is present.
 157                  *
 158                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 159                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 160                  * as defined in SPC-2.
 161                  */
 162                 if (pr_reg->pr_res_holder) {
 163                         core_scsi3_put_pr_reg(pr_reg);
 164                         return 1;
 165                 }
 166                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 168                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 169                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 170                         core_scsi3_put_pr_reg(pr_reg);
 171                         return 1;
 172                 }
 173                 core_scsi3_put_pr_reg(pr_reg);
 174                 conflict = 1;
 175         } else {
 176                 /*
 177                  * Following spc2r20 5.5.1 Reservations overview:
 178                  *
 179                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 180                  * command with the REGISTER or the REGISTER AND IGNORE
 181                  * EXISTING KEY service action and is still registered by any
 182                  * initiator, all RESERVE commands and all RELEASE commands
 183                  * regardless of initiator shall conflict and shall terminate
 184                  * with a RESERVATION CONFLICT status.
 185                  */
 186                 spin_lock(&pr_tmpl->registration_lock);
 187                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 188                 spin_unlock(&pr_tmpl->registration_lock);
 189         }
 190
 191         if (conflict) {
 192                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 193                         " while active SPC-3 registrations exist,"
 194                         " returning RESERVATION_CONFLICT\n");
 195                 return -EBUSY;
 196         }
 197
 198         return 0;
 199 }
 200
 201 sense_reason_t
 202 target_scsi2_reservation_release(struct se_cmd *cmd)
 203 {
 204         struct se_device *dev = cmd->se_dev;
 205         struct se_session *sess = cmd->se_sess;
 206         struct se_portal_group *tpg;
 207         int rc;
 208
 209         if (!sess || !sess->se_tpg)
 210                 goto out;
 211         rc = target_check_scsi2_reservation_conflict(cmd);
 212         if (rc == 1)
 213                 goto out;
 214         if (rc < 0)
 215                 return TCM_RESERVATION_CONFLICT;
 216
 217         spin_lock(&dev->dev_reservation_lock);
 218         if (!dev->dev_reserved_node_acl || !sess)
 219                 goto out_unlock;
 220
 221         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 222                 goto out_unlock;
 223
 224         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 225                 goto out_unlock;
 226
 227         dev->dev_reserved_node_acl = NULL;
 228         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 229         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 230                 dev->dev_res_bin_isid = 0;
 231                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 232         }
 233         tpg = sess->se_tpg;
 234         pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
 235                 " MAPPED LUN: %llu for %s\n",
 236                 tpg->se_tpg_tfo->get_fabric_name(),
 237                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 238                 sess->se_node_acl->initiatorname);
 239
 240 out_unlock:
 241         spin_unlock(&dev->dev_reservation_lock);
 242 out:
 243         target_complete_cmd(cmd, GOOD);
 244         return 0;
 245 }
 246
 247 sense_reason_t
 248 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 249 {
 250         struct se_device *dev = cmd->se_dev;
 251         struct se_session *sess = cmd->se_sess;
 252         struct se_portal_group *tpg;
 253         sense_reason_t ret = 0;
 254         int rc;
 255
 256         if ((cmd->t_task_cdb[1] & 0x01) &&
 257             (cmd->t_task_cdb[1] & 0x02)) {
 258                 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
 259                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 260         }
 261         /*
 262          * This is currently the case for target_core_mod passthrough struct se_cmd
 263          * ops
 264          */
 265         if (!sess || !sess->se_tpg)
 266                 goto out;
 267         rc = target_check_scsi2_reservation_conflict(cmd);
 268         if (rc == 1)
 269                 goto out;
 270
 271         if (rc < 0)
 272                 return TCM_RESERVATION_CONFLICT;
 273
 274         tpg = sess->se_tpg;
 275         spin_lock(&dev->dev_reservation_lock);
 276         if (dev->dev_reserved_node_acl &&
 277            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 278                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 279                         tpg->se_tpg_tfo->get_fabric_name());
 280                 pr_err("Original reserver LUN: %llu %s\n",
 281                         cmd->se_lun->unpacked_lun,
 282                         dev->dev_reserved_node_acl->initiatorname);
 283                 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
 284                         " from %s \n", cmd->se_lun->unpacked_lun,
 285                         cmd->orig_fe_lun,
 286                         sess->se_node_acl->initiatorname);
 287                 ret = TCM_RESERVATION_CONFLICT;
 288                 goto out_unlock;
 289         }
 290
 291         dev->dev_reserved_node_acl = sess->se_node_acl;
 292         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 293         if (sess->sess_bin_isid != 0) {
 294                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 295                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 296         }
 297         pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
 298                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 299                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 300                 sess->se_node_acl->initiatorname);
 301
 302 out_unlock:
 303         spin_unlock(&dev->dev_reservation_lock);
 304 out:
 305         if (!ret)
 306                 target_complete_cmd(cmd, GOOD);
 307         return ret;
 308 }
 309
 310
 311 /*
 312  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 313  *
 314  * This function is called by those initiator ports who are *NOT*
 315  * the active PR reservation holder when a reservation is present.
 316  */
 317 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 318                                         bool isid_mismatch)
 319 {
 320         unsigned char *cdb = cmd->t_task_cdb;
 321         struct se_session *se_sess = cmd->se_sess;
 322         struct se_node_acl *nacl = se_sess->se_node_acl;
 323         int other_cdb = 0;
 324         int registered_nexus = 0, ret = 1; /* Conflict by default */
 325         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 326         int we = 0; /* Write Exclusive */
 327         int legacy = 0; /* Act like a legacy device and return
 328                          * RESERVATION CONFLICT on some CDBs */
 329
 330         if (isid_mismatch) {
 331                 registered_nexus = 0;
 332         } else {
 333                 struct se_dev_entry *se_deve;
 334
 335                 rcu_read_lock();
 336                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 337                 if (se_deve)
 338                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 339                                                     &se_deve->deve_flags);
 340                 rcu_read_unlock();
 341         }
 342
 343         switch (pr_reg_type) {
 344         case PR_TYPE_WRITE_EXCLUSIVE:
 345                 we = 1;
 346         case PR_TYPE_EXCLUSIVE_ACCESS:
 347                 /*
 348                  * Some commands are only allowed for the persistent reservation
 349                  * holder.
 350                  */
 351                 break;
 352         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 353                 we = 1;
 354         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 355                 /*
 356                  * Some commands are only allowed for registered I_T Nexuses.
 357                  */
 358                 reg_only = 1;
 359                 break;
 360         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 361                 we = 1;
 362         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 363                 /*
 364                  * Each registered I_T Nexus is a reservation holder.
 365                  */
 366                 all_reg = 1;
 367                 break;
 368         default:
 369                 return -EINVAL;
 370         }
 371         /*
 372          * Referenced from spc4r17 table 45 for *NON* PR holder access
 373          */
 374         switch (cdb[0]) {
 375         case SECURITY_PROTOCOL_IN:
 376                 if (registered_nexus)
 377                         return 0;
 378                 ret = (we) ? 0 : 1;
 379                 break;
 380         case MODE_SENSE:
 381         case MODE_SENSE_10:
 382         case READ_ATTRIBUTE:
 383         case READ_BUFFER:
 384         case RECEIVE_DIAGNOSTIC:
 385                 if (legacy) {
 386                         ret = 1;
 387                         break;
 388                 }
 389                 if (registered_nexus) {
 390                         ret = 0;
 391                         break;
 392                 }
 393                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 394                 break;
 395         case PERSISTENT_RESERVE_OUT:
 396                 /*
 397                  * This follows PERSISTENT_RESERVE_OUT service actions that
 398                  * are allowed in the presence of various reservations.
 399                  * See spc4r17, table 46
 400                  */
 401                 switch (cdb[1] & 0x1f) {
 402                 case PRO_CLEAR:
 403                 case PRO_PREEMPT:
 404                 case PRO_PREEMPT_AND_ABORT:
 405                         ret = (registered_nexus) ? 0 : 1;
 406                         break;
 407                 case PRO_REGISTER:
 408                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 409                         ret = 0;
 410                         break;
 411                 case PRO_REGISTER_AND_MOVE:
 412                 case PRO_RESERVE:
 413                         ret = 1;
 414                         break;
 415                 case PRO_RELEASE:
 416                         ret = (registered_nexus) ? 0 : 1;
 417                         break;
 418                 default:
 419                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 420                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 421                         return -EINVAL;
 422                 }
 423                 break;
 424         case RELEASE:
 425         case RELEASE_10:
 426                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 427                 ret = 0;
 428                 break;
 429         case RESERVE:
 430         case RESERVE_10:
 431                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 432                 ret = 0;
 433                 break;
 434         case TEST_UNIT_READY:
 435                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 436                 break;
 437         case MAINTENANCE_IN:
 438                 switch (cdb[1] & 0x1f) {
 439                 case MI_MANAGEMENT_PROTOCOL_IN:
 440                         if (registered_nexus) {
 441                                 ret = 0;
 442                                 break;
 443                         }
 444                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 445                         break;
 446                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 447                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 448                         if (legacy) {
 449                                 ret = 1;
 450                                 break;
 451                         }
 452                         if (registered_nexus) {
 453                                 ret = 0;
 454                                 break;
 455                         }
 456                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 457                         break;
 458                 case MI_REPORT_ALIASES:
 459                 case MI_REPORT_IDENTIFYING_INFORMATION:
 460                 case MI_REPORT_PRIORITY:
 461                 case MI_REPORT_TARGET_PGS:
 462                 case MI_REPORT_TIMESTAMP:
 463                         ret = 0; /* Allowed */
 464                         break;
 465                 default:
 466                         pr_err("Unknown MI Service Action: 0x%02x\n",
 467                                 (cdb[1] & 0x1f));
 468                         return -EINVAL;
 469                 }
 470                 break;
 471         case ACCESS_CONTROL_IN:
 472         case ACCESS_CONTROL_OUT:
 473         case INQUIRY:
 474         case LOG_SENSE:
 475         case SERVICE_ACTION_IN_12:
 476         case REPORT_LUNS:
 477         case REQUEST_SENSE:
 478         case PERSISTENT_RESERVE_IN:
 479                 ret = 0; /*/ Allowed CDBs */
 480                 break;
 481         default:
 482                 other_cdb = 1;
 483                 break;
 484         }
 485         /*
 486          * Case where the CDB is explicitly allowed in the above switch
 487          * statement.
 488          */
 489         if (!ret && !other_cdb) {
 490                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 491                         " reservation holder\n", cdb[0],
 492                         core_scsi3_pr_dump_type(pr_reg_type));
 493
 494                 return ret;
 495         }
 496         /*
 497          * Check if write exclusive initiator ports *NOT* holding the
 498          * WRITE_EXCLUSIVE_* reservation.
 499          */
 500         if (we && !registered_nexus) {
 501                 if (cmd->data_direction == DMA_TO_DEVICE) {
 502                         /*
 503                          * Conflict for write exclusive
 504                          */
 505                         pr_debug("%s Conflict for unregistered nexus"
 506                                 " %s CDB: 0x%02x to %s reservation\n",
 507                                 transport_dump_cmd_direction(cmd),
 508                                 se_sess->se_node_acl->initiatorname, cdb[0],
 509                                 core_scsi3_pr_dump_type(pr_reg_type));
 510                         return 1;
 511                 } else {
 512                         /*
 513                          * Allow non WRITE CDBs for all Write Exclusive
 514                          * PR TYPEs to pass for registered and
 515                          * non-registered_nexuxes NOT holding the reservation.
 516                          *
 517                          * We only make noise for the unregisterd nexuses,
 518                          * as we expect registered non-reservation holding
 519                          * nexuses to issue CDBs.
 520                          */
 521
 522                         if (!registered_nexus) {
 523                                 pr_debug("Allowing implicit CDB: 0x%02x"
 524                                         " for %s reservation on unregistered"
 525                                         " nexus\n", cdb[0],
 526                                         core_scsi3_pr_dump_type(pr_reg_type));
 527                         }
 528
 529                         return 0;
 530                 }
 531         } else if ((reg_only) || (all_reg)) {
 532                 if (registered_nexus) {
 533                         /*
 534                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 535                          * allow commands from registered nexuses.
 536                          */
 537
 538                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 539                                 " reservation\n", cdb[0],
 540                                 core_scsi3_pr_dump_type(pr_reg_type));
 541
 542                         return 0;
 543                 }
 544        } else if (we && registered_nexus) {
 545                /*
 546                 * Reads are allowed for Write Exclusive locks
 547                 * from all registrants.
 548                 */
 549                if (cmd->data_direction == DMA_FROM_DEVICE) {
 550                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 551                                " reservation\n", cdb[0],
 552                                core_scsi3_pr_dump_type(pr_reg_type));
 553
 554                        return 0;
 555                }
 556         }
 557         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 558                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 559                 (registered_nexus) ? "" : "un",
 560                 se_sess->se_node_acl->initiatorname, cdb[0],
 561                 core_scsi3_pr_dump_type(pr_reg_type));
 562
 563         return 1; /* Conflict by default */
 564 }
 565
 566 static sense_reason_t
 567 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 568 {
 569         struct se_device *dev = cmd->se_dev;
 570         struct se_session *sess = cmd->se_sess;
 571         u32 pr_reg_type;
 572         bool isid_mismatch = false;
 573
 574         if (!dev->dev_pr_res_holder)
 575                 return 0;
 576
 577         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 578         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 579         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 580                 goto check_nonholder;
 581
 582         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 583                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 584                     sess->sess_bin_isid) {
 585                         isid_mismatch = true;
 586                         goto check_nonholder;
 587                 }
 588         }
 589
 590         return 0;
 591
 592 check_nonholder:
 593         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 594                 return TCM_RESERVATION_CONFLICT;
 595         return 0;
 596 }
 597
 598 static u32 core_scsi3_pr_generation(struct se_device *dev)
 599 {
 600         u32 prg;
 601
 602         /*
 603          * PRGeneration field shall contain the value of a 32-bit wrapping
 604          * counter mainted by the device server.
 605          *
 606          * Note that this is done regardless of Active Persist across
 607          * Target PowerLoss (APTPL)
 608          *
 609          * See spc4r17 section 6.3.12 READ_KEYS service action
 610          */
 611         spin_lock(&dev->dev_reservation_lock);
 612         prg = dev->t10_pr.pr_generation++;
 613         spin_unlock(&dev->dev_reservation_lock);
 614
 615         return prg;
 616 }
 617
 618 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 619         struct se_device *dev,
 620         struct se_node_acl *nacl,
 621         struct se_lun *lun,
 622         struct se_dev_entry *dest_deve,
 623         u64 mapped_lun,
 624         unsigned char *isid,
 625         u64 sa_res_key,
 626         int all_tg_pt,
 627         int aptpl)
 628 {
 629         struct t10_pr_registration *pr_reg;
 630
 631         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 632         if (!pr_reg) {
 633                 pr_err("Unable to allocate struct t10_pr_registration\n");
 634                 return NULL;
 635         }
 636
 637         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 640         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 641         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 642         atomic_set(&pr_reg->pr_res_holders, 0);
 643         pr_reg->pr_reg_nacl = nacl;
 644         /*
 645          * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
 646          * the se_dev_entry->pr_ref will have been already obtained by
 647          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 648          *
 649          * Otherwise, locate se_dev_entry now and obtain a reference until
 650          * registration completes in __core_scsi3_add_registration().
 651          */
 652         if (dest_deve) {
 653                 pr_reg->pr_reg_deve = dest_deve;
 654         } else {
 655                 rcu_read_lock();
 656                 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 657                 if (!pr_reg->pr_reg_deve) {
 658                         rcu_read_unlock();
 659                         pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
 660                                 nacl->initiatorname, mapped_lun);
 661                         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 662                         return NULL;
 663                 }
 664                 kref_get(&pr_reg->pr_reg_deve->pr_kref);
 665                 rcu_read_unlock();
 666         }
 667         pr_reg->pr_res_mapped_lun = mapped_lun;
 668         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 669         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 670         pr_reg->pr_res_key = sa_res_key;
 671         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 672         pr_reg->pr_reg_aptpl = aptpl;
 673         /*
 674          * If an ISID value for this SCSI Initiator Port exists,
 675          * save it to the registration now.
 676          */
 677         if (isid != NULL) {
 678                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 679                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 680                 pr_reg->isid_present_at_reg = 1;
 681         }
 682
 683         return pr_reg;
 684 }
 685
 686 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 687 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 688
 689 /*
 690  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 691  * modes.
 692  */
 693 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 694         struct se_device *dev,
 695         struct se_node_acl *nacl,
 696         struct se_lun *lun,
 697         struct se_dev_entry *deve,
 698         u64 mapped_lun,
 699         unsigned char *isid,
 700         u64 sa_res_key,
 701         int all_tg_pt,
 702         int aptpl)
 703 {
 704         struct se_dev_entry *deve_tmp;
 705         struct se_node_acl *nacl_tmp;
 706         struct se_lun_acl *lacl_tmp;
 707         struct se_lun *lun_tmp, *next, *dest_lun;
 708         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 709         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 710         int ret;
 711         /*
 712          * Create a registration for the I_T Nexus upon which the
 713          * PROUT REGISTER was received.
 714          */
 715         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 716                                                     isid, sa_res_key, all_tg_pt,
 717                                                     aptpl);
 718         if (!pr_reg)
 719                 return NULL;
 720         /*
 721          * Return pointer to pr_reg for ALL_TG_PT=0
 722          */
 723         if (!all_tg_pt)
 724                 return pr_reg;
 725         /*
 726          * Create list of matching SCSI Initiator Port registrations
 727          * for ALL_TG_PT=1
 728          */
 729         spin_lock(&dev->se_port_lock);
 730         list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
 731                 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
 732                         continue;
 733                 spin_unlock(&dev->se_port_lock);
 734
 735                 spin_lock(&lun_tmp->lun_deve_lock);
 736                 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 737                         /*
 738                          * This pointer will be NULL for demo mode MappedLUNs
 739                          * that have not been make explicit via a ConfigFS
 740                          * MappedLUN group for the SCSI Initiator Node ACL.
 741                          */
 742                         if (!deve_tmp->se_lun_acl)
 743                                 continue;
 744
 745                         lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
 746                                                 lockdep_is_held(&lun_tmp->lun_deve_lock));
 747                         nacl_tmp = lacl_tmp->se_lun_nacl;
 748                         /*
 749                          * Skip the matching struct se_node_acl that is allocated
 750                          * above..
 751                          */
 752                         if (nacl == nacl_tmp)
 753                                 continue;
 754                         /*
 755                          * Only perform PR registrations for target ports on
 756                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 757                          * arrived.
 758                          */
 759                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 760                                 continue;
 761                         /*
 762                          * Look for a matching Initiator Node ACL in ASCII format
 763                          */
 764                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 765                                 continue;
 766
 767                         kref_get(&deve_tmp->pr_kref);
 768                         spin_unlock(&lun_tmp->lun_deve_lock);
 769                         /*
 770                          * Grab a configfs group dependency that is released
 771                          * for the exception path at label out: below, or upon
 772                          * completion of adding ALL_TG_PT=1 registrations in
 773                          * __core_scsi3_add_registration()
 774                          */
 775                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 776                         if (ret < 0) {
 777                                 pr_err("core_scsi3_lunacl_depend"
 778                                                 "_item() failed\n");
 779                                 percpu_ref_put(&lun_tmp->lun_ref);
 780                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 781                                 goto out;
 782                         }
 783                         /*
 784                          * Located a matching SCSI Initiator Port on a different
 785                          * port, allocate the pr_reg_atp and attach it to the
 786                          * pr_reg->pr_reg_atp_list that will be processed once
 787                          * the original *pr_reg is processed in
 788                          * __core_scsi3_add_registration()
 789                          */
 790                         dest_lun = rcu_dereference_check(deve_tmp->se_lun,
 791                                 kref_read(&deve_tmp->pr_kref) != 0);
 792
 793                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 794                                                 nacl_tmp, dest_lun, deve_tmp,
 795                                                 deve_tmp->mapped_lun, NULL,
 796                                                 sa_res_key, all_tg_pt, aptpl);
 797                         if (!pr_reg_atp) {
 798                                 percpu_ref_put(&lun_tmp->lun_ref);
 799                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 800                                 goto out;
 801                         }
 802
 803                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 804                                       &pr_reg->pr_reg_atp_list);
 805                         spin_lock(&lun_tmp->lun_deve_lock);
 806                 }
 807                 spin_unlock(&lun_tmp->lun_deve_lock);
 808
 809                 spin_lock(&dev->se_port_lock);
 810                 percpu_ref_put(&lun_tmp->lun_ref);
 811         }
 812         spin_unlock(&dev->se_port_lock);
 813
 814         return pr_reg;
 815 out:
 816         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 817                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 818                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 819                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 820                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 821         }
 822         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 823         return NULL;
 824 }
 825
 826 int core_scsi3_alloc_aptpl_registration(
 827         struct t10_reservation *pr_tmpl,
 828         u64 sa_res_key,
 829         unsigned char *i_port,
 830         unsigned char *isid,
 831         u64 mapped_lun,
 832         unsigned char *t_port,
 833         u16 tpgt,
 834         u64 target_lun,
 835         int res_holder,
 836         int all_tg_pt,
 837         u8 type)
 838 {
 839         struct t10_pr_registration *pr_reg;
 840
 841         if (!i_port || !t_port || !sa_res_key) {
 842                 pr_err("Illegal parameters for APTPL registration\n");
 843                 return -EINVAL;
 844         }
 845
 846         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 847         if (!pr_reg) {
 848                 pr_err("Unable to allocate struct t10_pr_registration\n");
 849                 return -ENOMEM;
 850         }
 851
 852         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 853         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 854         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 855         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 856         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 857         atomic_set(&pr_reg->pr_res_holders, 0);
 858         pr_reg->pr_reg_nacl = NULL;
 859         pr_reg->pr_reg_deve = NULL;
 860         pr_reg->pr_res_mapped_lun = mapped_lun;
 861         pr_reg->pr_aptpl_target_lun = target_lun;
 862         pr_reg->pr_res_key = sa_res_key;
 863         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 864         pr_reg->pr_reg_aptpl = 1;
 865         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 866         pr_reg->pr_res_type = type;
 867         /*
 868          * If an ISID value had been saved in APTPL metadata for this
 869          * SCSI Initiator Port, restore it now.
 870          */
 871         if (isid != NULL) {
 872                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 873                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 874                 pr_reg->isid_present_at_reg = 1;
 875         }
 876         /*
 877          * Copy the i_port and t_port information from caller.
 878          */
 879         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 880         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 881         pr_reg->pr_reg_tpgt = tpgt;
 882         /*
 883          * Set pr_res_holder from caller, the pr_reg who is the reservation
 884          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 885          * the Initiator Node LUN ACL from the fabric module is created for
 886          * this registration.
 887          */
 888         pr_reg->pr_res_holder = res_holder;
 889
 890         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 891         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 892                         " metadata\n", (res_holder) ? "+reservation" : "");
 893         return 0;
 894 }
 895
 896 static void core_scsi3_aptpl_reserve(
 897         struct se_device *dev,
 898         struct se_portal_group *tpg,
 899         struct se_node_acl *node_acl,
 900         struct t10_pr_registration *pr_reg)
 901 {
 902         char i_buf[PR_REG_ISID_ID_LEN];
 903
 904         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 905         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 906
 907         spin_lock(&dev->dev_reservation_lock);
 908         dev->dev_pr_res_holder = pr_reg;
 909         spin_unlock(&dev->dev_reservation_lock);
 910
 911         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 912                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 913                 tpg->se_tpg_tfo->get_fabric_name(),
 914                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 915                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 916         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 917                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 918                 i_buf);
 919 }
 920
 921 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 922                                 struct t10_pr_registration *, enum register_type, int);
 923
 924 static int __core_scsi3_check_aptpl_registration(
 925         struct se_device *dev,
 926         struct se_portal_group *tpg,
 927         struct se_lun *lun,
 928         u64 target_lun,
 929         struct se_node_acl *nacl,
 930         u64 mapped_lun)
 931 {
 932         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 933         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 934         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 935         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 936         u16 tpgt;
 937
 938         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 939         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 940         /*
 941          * Copy Initiator Port information from struct se_node_acl
 942          */
 943         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 944         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 945                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 946         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 947         /*
 948          * Look for the matching registrations+reservation from those
 949          * created from APTPL metadata.  Note that multiple registrations
 950          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 951          * TransportIDs.
 952          */
 953         spin_lock(&pr_tmpl->aptpl_reg_lock);
 954         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 955                                 pr_reg_aptpl_list) {
 956
 957                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 958                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 959                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 960                      (pr_reg->pr_reg_tpgt == tpgt) &&
 961                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 962                         /*
 963                          * Obtain the ->pr_reg_deve pointer + reference, that
 964                          * is released by __core_scsi3_add_registration() below.
 965                          */
 966                         rcu_read_lock();
 967                         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 968                         if (!pr_reg->pr_reg_deve) {
 969                                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
 970                                         " %llu\n", nacl->initiatorname, mapped_lun);
 971                                 rcu_read_unlock();
 972                                 continue;
 973                         }
 974                         kref_get(&pr_reg->pr_reg_deve->pr_kref);
 975                         rcu_read_unlock();
 976
 977                         pr_reg->pr_reg_nacl = nacl;
 978                         pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
 979                         list_del(&pr_reg->pr_reg_aptpl_list);
 980                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 981                         /*
 982                          * At this point all of the pointers in *pr_reg will
 983                          * be setup, so go ahead and add the registration.
 984                          */
 985                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 986                         /*
 987                          * If this registration is the reservation holder,
 988                          * make that happen now..
 989                          */
 990                         if (pr_reg->pr_res_holder)
 991                                 core_scsi3_aptpl_reserve(dev, tpg,
 992                                                 nacl, pr_reg);
 993                         /*
 994                          * Reenable pr_aptpl_active to accept new metadata
 995                          * updates once the SCSI device is active again..
 996                          */
 997                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 998                         pr_tmpl->pr_aptpl_active = 1;
 999                 }
1000         }
1001         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1002
1003         return 0;
1004 }
1005
1006 int core_scsi3_check_aptpl_registration(
1007         struct se_device *dev,
1008         struct se_portal_group *tpg,
1009         struct se_lun *lun,
1010         struct se_node_acl *nacl,
1011         u64 mapped_lun)
1012 {
1013         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1014                 return 0;
1015
1016         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1017                                                      lun->unpacked_lun, nacl,
1018                                                      mapped_lun);
1019 }
1020
1021 static void __core_scsi3_dump_registration(
1022         const struct target_core_fabric_ops *tfo,
1023         struct se_device *dev,
1024         struct se_node_acl *nacl,
1025         struct t10_pr_registration *pr_reg,
1026         enum register_type register_type)
1027 {
1028         struct se_portal_group *se_tpg = nacl->se_tpg;
1029         char i_buf[PR_REG_ISID_ID_LEN];
1030
1031         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1032         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1033
1034         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1035                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
1036                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1037                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1038                 i_buf);
1039         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1040                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1041                 tfo->tpg_get_tag(se_tpg));
1042         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1043                 " Port(s)\n",  tfo->get_fabric_name(),
1044                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1045                 dev->transport->name);
1046         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1047                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1048                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1049                 pr_reg->pr_reg_aptpl);
1050 }
1051
1052 static void __core_scsi3_add_registration(
1053         struct se_device *dev,
1054         struct se_node_acl *nacl,
1055         struct t10_pr_registration *pr_reg,
1056         enum register_type register_type,
1057         int register_move)
1058 {
1059         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1060         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1061         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1062         struct se_dev_entry *deve;
1063
1064         /*
1065          * Increment PRgeneration counter for struct se_device upon a successful
1066          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1067          *
1068          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1069          * action, the struct se_device->dev_reservation_lock will already be held,
1070          * so we do not call core_scsi3_pr_generation() which grabs the lock
1071          * for the REGISTER.
1072          */
1073         pr_reg->pr_res_generation = (register_move) ?
1074                         dev->t10_pr.pr_generation++ :
1075                         core_scsi3_pr_generation(dev);
1076
1077         spin_lock(&pr_tmpl->registration_lock);
1078         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1079
1080         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1081         spin_unlock(&pr_tmpl->registration_lock);
1082         /*
1083          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1084          */
1085         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1086                 goto out;
1087         /*
1088          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1089          * allocated in __core_scsi3_alloc_registration()
1090          */
1091         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1092                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1093                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1094
1095                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1096
1097                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1098
1099                 spin_lock(&pr_tmpl->registration_lock);
1100                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1101                               &pr_tmpl->registration_list);
1102
1103                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1104                                                register_type);
1105                 spin_unlock(&pr_tmpl->registration_lock);
1106                 /*
1107                  * Drop configfs group dependency reference and deve->pr_kref
1108                  * obtained from  __core_scsi3_alloc_registration() code.
1109                  */
1110                 rcu_read_lock();
1111                 deve = pr_reg_tmp->pr_reg_deve;
1112                 if (deve) {
1113                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1114                         core_scsi3_lunacl_undepend_item(deve);
1115                         pr_reg_tmp->pr_reg_deve = NULL;
1116                 }
1117                 rcu_read_unlock();
1118         }
1119 out:
1120         /*
1121          * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1122          */
1123         rcu_read_lock();
1124         deve = pr_reg->pr_reg_deve;
1125         if (deve) {
1126                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1127                 kref_put(&deve->pr_kref, target_pr_kref_release);
1128                 pr_reg->pr_reg_deve = NULL;
1129         }
1130         rcu_read_unlock();
1131 }
1132
1133 static int core_scsi3_alloc_registration(
1134         struct se_device *dev,
1135         struct se_node_acl *nacl,
1136         struct se_lun *lun,
1137         struct se_dev_entry *deve,
1138         u64 mapped_lun,
1139         unsigned char *isid,
1140         u64 sa_res_key,
1141         int all_tg_pt,
1142         int aptpl,
1143         enum register_type register_type,
1144         int register_move)
1145 {
1146         struct t10_pr_registration *pr_reg;
1147
1148         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1149                                                  isid, sa_res_key, all_tg_pt,
1150                                                  aptpl);
1151         if (!pr_reg)
1152                 return -EPERM;
1153
1154         __core_scsi3_add_registration(dev, nacl, pr_reg,
1155                         register_type, register_move);
1156         return 0;
1157 }
1158
1159 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1160         struct se_device *dev,
1161         struct se_node_acl *nacl,
1162         unsigned char *isid)
1163 {
1164         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1165         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1166         struct se_portal_group *tpg;
1167
1168         spin_lock(&pr_tmpl->registration_lock);
1169         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1170                         &pr_tmpl->registration_list, pr_reg_list) {
1171                 /*
1172                  * First look for a matching struct se_node_acl
1173                  */
1174                 if (pr_reg->pr_reg_nacl != nacl)
1175                         continue;
1176
1177                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1178                 /*
1179                  * If this registration does NOT contain a fabric provided
1180                  * ISID, then we have found a match.
1181                  */
1182                 if (!pr_reg->isid_present_at_reg) {
1183                         /*
1184                          * Determine if this SCSI device server requires that
1185                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1186                          * for fabric modules (iSCSI) requiring them.
1187                          */
1188                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1189                                 if (dev->dev_attrib.enforce_pr_isids)
1190                                         continue;
1191                         }
1192                         atomic_inc_mb(&pr_reg->pr_res_holders);
1193                         spin_unlock(&pr_tmpl->registration_lock);
1194                         return pr_reg;
1195                 }
1196                 /*
1197                  * If the *pr_reg contains a fabric defined ISID for multi-value
1198                  * SCSI Initiator Port TransportIDs, then we expect a valid
1199                  * matching ISID to be provided by the local SCSI Initiator Port.
1200                  */
1201                 if (!isid)
1202                         continue;
1203                 if (strcmp(isid, pr_reg->pr_reg_isid))
1204                         continue;
1205
1206                 atomic_inc_mb(&pr_reg->pr_res_holders);
1207                 spin_unlock(&pr_tmpl->registration_lock);
1208                 return pr_reg;
1209         }
1210         spin_unlock(&pr_tmpl->registration_lock);
1211
1212         return NULL;
1213 }
1214
1215 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1216         struct se_device *dev,
1217         struct se_node_acl *nacl,
1218         struct se_session *sess)
1219 {
1220         struct se_portal_group *tpg = nacl->se_tpg;
1221         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1222
1223         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1224                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1225                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1226                                         PR_REG_ISID_LEN);
1227                 isid_ptr = &buf[0];
1228         }
1229
1230         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1231 }
1232
1233 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1234 {
1235         atomic_dec_mb(&pr_reg->pr_res_holders);
1236 }
1237
1238 static int core_scsi3_check_implicit_release(
1239         struct se_device *dev,
1240         struct t10_pr_registration *pr_reg)
1241 {
1242         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1243         struct t10_pr_registration *pr_res_holder;
1244         int ret = 0;
1245
1246         spin_lock(&dev->dev_reservation_lock);
1247         pr_res_holder = dev->dev_pr_res_holder;
1248         if (!pr_res_holder) {
1249                 spin_unlock(&dev->dev_reservation_lock);
1250                 return ret;
1251         }
1252         if (pr_res_holder == pr_reg) {
1253                 /*
1254                  * Perform an implicit RELEASE if the registration that
1255                  * is being released is holding the reservation.
1256                  *
1257                  * From spc4r17, section 5.7.11.1:
1258                  *
1259                  * e) If the I_T nexus is the persistent reservation holder
1260                  *    and the persistent reservation is not an all registrants
1261                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1262                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1263                  *    service action with the SERVICE ACTION RESERVATION KEY
1264                  *    field set to zero (see 5.7.11.3).
1265                  */
1266                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1267                 ret = 1;
1268                 /*
1269                  * For 'All Registrants' reservation types, all existing
1270                  * registrations are still processed as reservation holders
1271                  * in core_scsi3_pr_seq_non_holder() after the initial
1272                  * reservation holder is implicitly released here.
1273                  */
1274         } else if (pr_reg->pr_reg_all_tg_pt &&
1275                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1276                           pr_reg->pr_reg_nacl->initiatorname)) &&
1277                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1278                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1279                         " UNREGISTER while existing reservation with matching"
1280                         " key 0x%016Lx is present from another SCSI Initiator"
1281                         " Port\n", pr_reg->pr_res_key);
1282                 ret = -EPERM;
1283         }
1284         spin_unlock(&dev->dev_reservation_lock);
1285
1286         return ret;
1287 }
1288
1289 /*
1290  * Called with struct t10_reservation->registration_lock held.
1291  */
1292 static void __core_scsi3_free_registration(
1293         struct se_device *dev,
1294         struct t10_pr_registration *pr_reg,
1295         struct list_head *preempt_and_abort_list,
1296         int dec_holders)
1297         __releases(&pr_tmpl->registration_lock)
1298         __acquires(&pr_tmpl->registration_lock)
1299 {
1300         const struct target_core_fabric_ops *tfo =
1301                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1302         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1303         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1304         struct se_dev_entry *deve;
1305         char i_buf[PR_REG_ISID_ID_LEN];
1306
1307         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1308         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1309
1310         if (!list_empty(&pr_reg->pr_reg_list))
1311                 list_del(&pr_reg->pr_reg_list);
1312         /*
1313          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1314          * so call core_scsi3_put_pr_reg() to decrement our reference.
1315          */
1316         if (dec_holders)
1317                 core_scsi3_put_pr_reg(pr_reg);
1318
1319         spin_unlock(&pr_tmpl->registration_lock);
1320         /*
1321          * Wait until all reference from any other I_T nexuses for this
1322          * *pr_reg have been released.  Because list_del() is called above,
1323          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1324          * count back to zero, and we release *pr_reg.
1325          */
1326         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1327                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1328                                 tfo->get_fabric_name());
1329                 cpu_relax();
1330         }
1331
1332         rcu_read_lock();
1333         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1334         if (deve)
1335                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1336         rcu_read_unlock();
1337
1338         spin_lock(&pr_tmpl->registration_lock);
1339         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1340                 " Node: %s%s\n", tfo->get_fabric_name(),
1341                 pr_reg->pr_reg_nacl->initiatorname,
1342                 i_buf);
1343         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1344                 " Port(s)\n", tfo->get_fabric_name(),
1345                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1346                 dev->transport->name);
1347         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1348                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1349                 pr_reg->pr_res_generation);
1350
1351         if (!preempt_and_abort_list) {
1352                 pr_reg->pr_reg_deve = NULL;
1353                 pr_reg->pr_reg_nacl = NULL;
1354                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1355                 return;
1356         }
1357         /*
1358          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1359          * are released once the ABORT_TASK_SET has completed..
1360          */
1361         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1362 }
1363
1364 void core_scsi3_free_pr_reg_from_nacl(
1365         struct se_device *dev,
1366         struct se_node_acl *nacl)
1367 {
1368         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1369         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1370         bool free_reg = false;
1371         /*
1372          * If the passed se_node_acl matches the reservation holder,
1373          * release the reservation.
1374          */
1375         spin_lock(&dev->dev_reservation_lock);
1376         pr_res_holder = dev->dev_pr_res_holder;
1377         if ((pr_res_holder != NULL) &&
1378             (pr_res_holder->pr_reg_nacl == nacl)) {
1379                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1380                 free_reg = true;
1381         }
1382         spin_unlock(&dev->dev_reservation_lock);
1383         /*
1384          * Release any registration associated with the struct se_node_acl.
1385          */
1386         spin_lock(&pr_tmpl->registration_lock);
1387         if (pr_res_holder && free_reg)
1388                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1389
1390         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1391                         &pr_tmpl->registration_list, pr_reg_list) {
1392
1393                 if (pr_reg->pr_reg_nacl != nacl)
1394                         continue;
1395
1396                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1397         }
1398         spin_unlock(&pr_tmpl->registration_lock);
1399 }
1400
1401 void core_scsi3_free_all_registrations(
1402         struct se_device *dev)
1403 {
1404         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1405         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1406
1407         spin_lock(&dev->dev_reservation_lock);
1408         pr_res_holder = dev->dev_pr_res_holder;
1409         if (pr_res_holder != NULL) {
1410                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1411                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1412                                                   pr_res_holder, 0, 0);
1413         }
1414         spin_unlock(&dev->dev_reservation_lock);
1415
1416         spin_lock(&pr_tmpl->registration_lock);
1417         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1418                         &pr_tmpl->registration_list, pr_reg_list) {
1419
1420                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1421         }
1422         spin_unlock(&pr_tmpl->registration_lock);
1423
1424         spin_lock(&pr_tmpl->aptpl_reg_lock);
1425         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1426                                 pr_reg_aptpl_list) {
1427                 list_del(&pr_reg->pr_reg_aptpl_list);
1428                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1429         }
1430         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1431 }
1432
1433 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1434 {
1435         return target_depend_item(&tpg->tpg_group.cg_item);
1436 }
1437
1438 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1439 {
1440         target_undepend_item(&tpg->tpg_group.cg_item);
1441         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1442 }
1443
1444 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1445 {
1446         if (nacl->dynamic_node_acl)
1447                 return 0;
1448         return target_depend_item(&nacl->acl_group.cg_item);
1449 }
1450
1451 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1452 {
1453         if (!nacl->dynamic_node_acl)
1454                 target_undepend_item(&nacl->acl_group.cg_item);
1455         atomic_dec_mb(&nacl->acl_pr_ref_count);
1456 }
1457
1458 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1459 {
1460         struct se_lun_acl *lun_acl;
1461
1462         /*
1463          * For nacl->dynamic_node_acl=1
1464          */
1465         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1466                                 kref_read(&se_deve->pr_kref) != 0);
1467         if (!lun_acl)
1468                 return 0;
1469
1470         return target_depend_item(&lun_acl->se_lun_group.cg_item);
1471 }
1472
1473 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1474 {
1475         struct se_lun_acl *lun_acl;
1476
1477         /*
1478          * For nacl->dynamic_node_acl=1
1479          */
1480         lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
1481                                 kref_read(&se_deve->pr_kref) != 0);
1482         if (!lun_acl) {
1483                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1484                 return;
1485         }
1486
1487         target_undepend_item(&lun_acl->se_lun_group.cg_item);
1488         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1489 }
1490
1491 static sense_reason_t
1492 core_scsi3_decode_spec_i_port(
1493         struct se_cmd *cmd,
1494         struct se_portal_group *tpg,
1495         unsigned char *l_isid,
1496         u64 sa_res_key,
1497         int all_tg_pt,
1498         int aptpl)
1499 {
1500         struct se_device *dev = cmd->se_dev;
1501         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1502         struct se_session *se_sess = cmd->se_sess;
1503         struct se_node_acl *dest_node_acl = NULL;
1504         struct se_dev_entry *dest_se_deve = NULL;
1505         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1506         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1507         LIST_HEAD(tid_dest_list);
1508         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1509         unsigned char *buf, *ptr, proto_ident;
1510         const unsigned char *i_str = NULL;
1511         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1512         sense_reason_t ret;
1513         u32 tpdl, tid_len = 0;
1514         u32 dest_rtpi = 0;
1515
1516         /*
1517          * Allocate a struct pr_transport_id_holder and setup the
1518          * local_node_acl pointer and add to struct list_head tid_dest_list
1519          * for add registration processing in the loop of tid_dest_list below.
1520          */
1521         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1522         if (!tidh_new) {
1523                 pr_err("Unable to allocate tidh_new\n");
1524                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1525         }
1526         INIT_LIST_HEAD(&tidh_new->dest_list);
1527         tidh_new->dest_tpg = tpg;
1528         tidh_new->dest_node_acl = se_sess->se_node_acl;
1529
1530         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1531                                 se_sess->se_node_acl, cmd->se_lun,
1532                                 NULL, cmd->orig_fe_lun, l_isid,
1533                                 sa_res_key, all_tg_pt, aptpl);
1534         if (!local_pr_reg) {
1535                 kfree(tidh_new);
1536                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1537         }
1538         tidh_new->dest_pr_reg = local_pr_reg;
1539         /*
1540          * The local I_T nexus does not hold any configfs dependances,
1541          * so we set tidh_new->dest_se_deve to NULL to prevent the
1542          * configfs_undepend_item() calls in the tid_dest_list loops below.
1543          */
1544         tidh_new->dest_se_deve = NULL;
1545         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1546
1547         if (cmd->data_length < 28) {
1548                 pr_warn("SPC-PR: Received PR OUT parameter list"
1549                         " length too small: %u\n", cmd->data_length);
1550                 ret = TCM_INVALID_PARAMETER_LIST;
1551                 goto out;
1552         }
1553
1554         buf = transport_kmap_data_sg(cmd);
1555         if (!buf) {
1556                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1557                 goto out;
1558         }
1559
1560         /*
1561          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1562          * first extract TransportID Parameter Data Length, and make sure
1563          * the value matches up to the SCSI expected data transfer length.
1564          */
1565         tpdl = get_unaligned_be32(&buf[24]);
1566
1567         if ((tpdl + 28) != cmd->data_length) {
1568                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1569                         " does not equal CDB data_length: %u\n", tpdl,
1570                         cmd->data_length);
1571                 ret = TCM_INVALID_PARAMETER_LIST;
1572                 goto out_unmap;
1573         }
1574         /*
1575          * Start processing the received transport IDs using the
1576          * receiving I_T Nexus portal's fabric dependent methods to
1577          * obtain the SCSI Initiator Port/Device Identifiers.
1578          */
1579         ptr = &buf[28];
1580
1581         while (tpdl > 0) {
1582                 struct se_lun *dest_lun, *tmp_lun;
1583
1584                 proto_ident = (ptr[0] & 0x0f);
1585                 dest_tpg = NULL;
1586
1587                 spin_lock(&dev->se_port_lock);
1588                 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1589                         tmp_tpg = tmp_lun->lun_tpg;
1590
1591                         /*
1592                          * Look for the matching proto_ident provided by
1593                          * the received TransportID
1594                          */
1595                         if (tmp_tpg->proto_id != proto_ident)
1596                                 continue;
1597                         dest_rtpi = tmp_lun->lun_rtpi;
1598
1599                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1600                                         (const char *)ptr, &tid_len, &iport_ptr);
1601                         if (!i_str)
1602                                 continue;
1603
1604                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1605                         spin_unlock(&dev->se_port_lock);
1606
1607                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1608                                 pr_err(" core_scsi3_tpg_depend_item()"
1609                                         " for tmp_tpg\n");
1610                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1611                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1612                                 goto out_unmap;
1613                         }
1614                         /*
1615                          * Locate the destination initiator ACL to be registered
1616                          * from the decoded fabric module specific TransportID
1617                          * at *i_str.
1618                          */
1619                         mutex_lock(&tmp_tpg->acl_node_mutex);
1620                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1621                                                 tmp_tpg, i_str);
1622                         if (dest_node_acl)
1623                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1624                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1625
1626                         if (!dest_node_acl) {
1627                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1628                                 spin_lock(&dev->se_port_lock);
1629                                 continue;
1630                         }
1631
1632                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1633                                 pr_err("configfs_depend_item() failed"
1634                                         " for dest_node_acl->acl_group\n");
1635                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1636                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1637                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1638                                 goto out_unmap;
1639                         }
1640
1641                         dest_tpg = tmp_tpg;
1642                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1643                                 " %s Port RTPI: %hu\n",
1644                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1645                                 dest_node_acl->initiatorname, dest_rtpi);
1646
1647                         spin_lock(&dev->se_port_lock);
1648                         break;
1649                 }
1650                 spin_unlock(&dev->se_port_lock);
1651
1652                 if (!dest_tpg) {
1653                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1654                                         " dest_tpg\n");
1655                         ret = TCM_INVALID_PARAMETER_LIST;
1656                         goto out_unmap;
1657                 }
1658
1659                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1660                         " tid_len: %d for %s + %s\n",
1661                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1662                         tpdl, tid_len, i_str, iport_ptr);
1663
1664                 if (tid_len > tpdl) {
1665                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1666                                 " %u for Transport ID: %s\n", tid_len, ptr);
1667                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1668                         core_scsi3_tpg_undepend_item(dest_tpg);
1669                         ret = TCM_INVALID_PARAMETER_LIST;
1670                         goto out_unmap;
1671                 }
1672                 /*
1673                  * Locate the desintation struct se_dev_entry pointer for matching
1674                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1675                  * Target Port.
1676                  */
1677                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1678                                         dest_rtpi);
1679                 if (!dest_se_deve) {
1680                         pr_err("Unable to locate %s dest_se_deve"
1681                                 " from destination RTPI: %hu\n",
1682                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1683                                 dest_rtpi);
1684
1685                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1686                         core_scsi3_tpg_undepend_item(dest_tpg);
1687                         ret = TCM_INVALID_PARAMETER_LIST;
1688                         goto out_unmap;
1689                 }
1690
1691                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1692                         pr_err("core_scsi3_lunacl_depend_item()"
1693                                         " failed\n");
1694                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1695                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1696                         core_scsi3_tpg_undepend_item(dest_tpg);
1697                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1698                         goto out_unmap;
1699                 }
1700
1701                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1702                         " dest_se_deve mapped_lun: %llu\n",
1703                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1704                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1705
1706                 /*
1707                  * Skip any TransportIDs that already have a registration for
1708                  * this target port.
1709                  */
1710                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1711                                         iport_ptr);
1712                 if (pr_reg_e) {
1713                         core_scsi3_put_pr_reg(pr_reg_e);
1714                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1715                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1716                         core_scsi3_tpg_undepend_item(dest_tpg);
1717                         ptr += tid_len;
1718                         tpdl -= tid_len;
1719                         tid_len = 0;
1720                         continue;
1721                 }
1722                 /*
1723                  * Allocate a struct pr_transport_id_holder and setup
1724                  * the dest_node_acl and dest_se_deve pointers for the
1725                  * loop below.
1726                  */
1727                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1728                                 GFP_KERNEL);
1729                 if (!tidh_new) {
1730                         pr_err("Unable to allocate tidh_new\n");
1731                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1732                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1733                         core_scsi3_tpg_undepend_item(dest_tpg);
1734                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1735                         goto out_unmap;
1736                 }
1737                 INIT_LIST_HEAD(&tidh_new->dest_list);
1738                 tidh_new->dest_tpg = dest_tpg;
1739                 tidh_new->dest_node_acl = dest_node_acl;
1740                 tidh_new->dest_se_deve = dest_se_deve;
1741
1742                 /*
1743                  * Allocate, but do NOT add the registration for the
1744                  * TransportID referenced SCSI Initiator port.  This
1745                  * done because of the following from spc4r17 in section
1746                  * 6.14.3 wrt SPEC_I_PT:
1747                  *
1748                  * "If a registration fails for any initiator port (e.g., if th
1749                  * logical unit does not have enough resources available to
1750                  * hold the registration information), no registrations shall be
1751                  * made, and the command shall be terminated with
1752                  * CHECK CONDITION status."
1753                  *
1754                  * That means we call __core_scsi3_alloc_registration() here,
1755                  * and then call __core_scsi3_add_registration() in the
1756                  * 2nd loop which will never fail.
1757                  */
1758                 dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
1759                                 kref_read(&dest_se_deve->pr_kref) != 0);
1760
1761                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1762                                         dest_node_acl, dest_lun, dest_se_deve,
1763                                         dest_se_deve->mapped_lun, iport_ptr,
1764                                         sa_res_key, all_tg_pt, aptpl);
1765                 if (!dest_pr_reg) {
1766                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1767                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1768                         core_scsi3_tpg_undepend_item(dest_tpg);
1769                         kfree(tidh_new);
1770                         ret = TCM_INVALID_PARAMETER_LIST;
1771                         goto out_unmap;
1772                 }
1773                 tidh_new->dest_pr_reg = dest_pr_reg;
1774                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1775
1776                 ptr += tid_len;
1777                 tpdl -= tid_len;
1778                 tid_len = 0;
1779
1780         }
1781
1782         transport_kunmap_data_sg(cmd);
1783
1784         /*
1785          * Go ahead and create a registrations from tid_dest_list for the
1786          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1787          * and dest_se_deve.
1788          *
1789          * The SA Reservation Key from the PROUT is set for the
1790          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1791          * means that the TransportID Initiator port will be
1792          * registered on all of the target ports in the SCSI target device
1793          * ALL_TG_PT=0 means the registration will only be for the
1794          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1795          * was received.
1796          */
1797         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1798                 dest_tpg = tidh->dest_tpg;
1799                 dest_node_acl = tidh->dest_node_acl;
1800                 dest_se_deve = tidh->dest_se_deve;
1801                 dest_pr_reg = tidh->dest_pr_reg;
1802
1803                 list_del(&tidh->dest_list);
1804                 kfree(tidh);
1805
1806                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1807                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1808
1809                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1810                                         dest_pr_reg, 0, 0);
1811
1812                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1813                         " registered Transport ID for Node: %s%s Mapped LUN:"
1814                         " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1815                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1816                         dest_se_deve->mapped_lun : 0);
1817
1818                 if (!dest_se_deve) {
1819                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1820                                  target_pr_kref_release);
1821                         continue;
1822                 }
1823                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1824                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1825                 core_scsi3_tpg_undepend_item(dest_tpg);
1826         }
1827
1828         return 0;
1829 out_unmap:
1830         transport_kunmap_data_sg(cmd);
1831 out:
1832         /*
1833          * For the failure case, release everything from tid_dest_list
1834          * including *dest_pr_reg and the configfs dependances..
1835          */
1836         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1837                 dest_tpg = tidh->dest_tpg;
1838                 dest_node_acl = tidh->dest_node_acl;
1839                 dest_se_deve = tidh->dest_se_deve;
1840                 dest_pr_reg = tidh->dest_pr_reg;
1841
1842                 list_del(&tidh->dest_list);
1843                 kfree(tidh);
1844                 /*
1845                  * Release any extra ALL_TG_PT=1 registrations for
1846                  * the SPEC_I_PT=1 case.
1847                  */
1848                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1849                                 &dest_pr_reg->pr_reg_atp_list,
1850                                 pr_reg_atp_mem_list) {
1851                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1852                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1853                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1854                 }
1855
1856                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1857
1858                 if (!dest_se_deve) {
1859                         kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1860                                  target_pr_kref_release);
1861                         continue;
1862                 }
1863                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1864                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1865                 core_scsi3_tpg_undepend_item(dest_tpg);
1866         }
1867         return ret;
1868 }
1869
1870 static int core_scsi3_update_aptpl_buf(
1871         struct se_device *dev,
1872         unsigned char *buf,
1873         u32 pr_aptpl_buf_len)
1874 {
1875         struct se_portal_group *tpg;
1876         struct t10_pr_registration *pr_reg;
1877         unsigned char tmp[512], isid_buf[32];
1878         ssize_t len = 0;
1879         int reg_count = 0;
1880         int ret = 0;
1881
1882         spin_lock(&dev->dev_reservation_lock);
1883         spin_lock(&dev->t10_pr.registration_lock);
1884         /*
1885          * Walk the registration list..
1886          */
1887         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1888                         pr_reg_list) {
1889
1890                 tmp[0] = '\0';
1891                 isid_buf[0] = '\0';
1892                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1893                 /*
1894                  * Write out any ISID value to APTPL metadata that was included
1895                  * in the original registration.
1896                  */
1897                 if (pr_reg->isid_present_at_reg)
1898                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1899                                         pr_reg->pr_reg_isid);
1900                 /*
1901                  * Include special metadata if the pr_reg matches the
1902                  * reservation holder.
1903                  */
1904                 if (dev->dev_pr_res_holder == pr_reg) {
1905                         snprintf(tmp, 512, "PR_REG_START: %d"
1906                                 "\ninitiator_fabric=%s\n"
1907                                 "initiator_node=%s\n%s"
1908                                 "sa_res_key=%llu\n"
1909                                 "res_holder=1\nres_type=%02x\n"
1910                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1911                                 "mapped_lun=%llu\n", reg_count,
1912                                 tpg->se_tpg_tfo->get_fabric_name(),
1913                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1914                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1915                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1916                                 pr_reg->pr_res_mapped_lun);
1917                 } else {
1918                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1919                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1920                                 "sa_res_key=%llu\nres_holder=0\n"
1921                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1922                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1923                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1924                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1925                                 pr_reg->pr_res_mapped_lun);
1926                 }
1927
1928                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1929                         pr_err("Unable to update renaming APTPL metadata,"
1930                                " reallocating larger buffer\n");
1931                         ret = -EMSGSIZE;
1932                         goto out;
1933                 }
1934                 len += sprintf(buf+len, "%s", tmp);
1935
1936                 /*
1937                  * Include information about the associated SCSI target port.
1938                  */
1939                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1940                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1941                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1942                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1943                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1944                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1945                         reg_count);
1946
1947                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1948                         pr_err("Unable to update renaming APTPL metadata,"
1949                                " reallocating larger buffer\n");
1950                         ret = -EMSGSIZE;
1951                         goto out;
1952                 }
1953                 len += sprintf(buf+len, "%s", tmp);
1954                 reg_count++;
1955         }
1956
1957         if (!reg_count)
1958                 len += sprintf(buf+len, "No Registrations or Reservations");
1959
1960 out:
1961         spin_unlock(&dev->t10_pr.registration_lock);
1962         spin_unlock(&dev->dev_reservation_lock);
1963
1964         return ret;
1965 }
1966
1967 static int __core_scsi3_write_aptpl_to_file(
1968         struct se_device *dev,
1969         unsigned char *buf)
1970 {
1971         struct t10_wwn *wwn = &dev->t10_wwn;
1972         struct file *file;
1973         int flags = O_RDWR | O_CREAT | O_TRUNC;
1974         char path[512];
1975         u32 pr_aptpl_buf_len;
1976         int ret;
1977
1978         memset(path, 0, 512);
1979
1980         if (strlen(&wwn->unit_serial[0]) >= 512) {
1981                 pr_err("WWN value for struct se_device does not fit"
1982                         " into path buffer\n");
1983                 return -EMSGSIZE;
1984         }
1985
1986         snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]);
1987         file = filp_open(path, flags, 0600);
1988         if (IS_ERR(file)) {
1989                 pr_err("filp_open(%s) for APTPL metadata"
1990                         " failed\n", path);
1991                 return PTR_ERR(file);
1992         }
1993
1994         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1995
1996         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1997
1998         if (ret < 0)
1999                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2000         fput(file);
2001
2002         return (ret < 0) ? -EIO : 0;
2003 }
2004
2005 /*
2006  * Clear the APTPL metadata if APTPL has been disabled, otherwise
2007  * write out the updated metadata to struct file for this SCSI device.
2008  */
2009 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
2010 {
2011         unsigned char *buf;
2012         int rc, len = PR_APTPL_BUF_LEN;
2013
2014         if (!aptpl) {
2015                 char *null_buf = "No Registrations or Reservations\n";
2016
2017                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2018                 dev->t10_pr.pr_aptpl_active = 0;
2019                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2020
2021                 if (rc)
2022                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2023
2024                 return 0;
2025         }
2026 retry:
2027         buf = vzalloc(len);
2028         if (!buf)
2029                 return TCM_OUT_OF_RESOURCES;
2030
2031         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2032         if (rc < 0) {
2033                 vfree(buf);
2034                 len *= 2;
2035                 goto retry;
2036         }
2037
2038         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2039         if (rc != 0) {
2040                 pr_err("SPC-3 PR: Could not update APTPL\n");
2041                 vfree(buf);
2042                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2043         }
2044         dev->t10_pr.pr_aptpl_active = 1;
2045         vfree(buf);
2046         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2047         return 0;
2048 }
2049
2050 static sense_reason_t
2051 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2052                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2053 {
2054         struct se_session *se_sess = cmd->se_sess;
2055         struct se_device *dev = cmd->se_dev;
2056         struct se_lun *se_lun = cmd->se_lun;
2057         struct se_portal_group *se_tpg;
2058         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2059         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2060         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2061         sense_reason_t ret = TCM_NO_SENSE;
2062         int pr_holder = 0, type;
2063
2064         if (!se_sess || !se_lun) {
2065                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2066                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2067         }
2068         se_tpg = se_sess->se_tpg;
2069
2070         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2071                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2072                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2073                                 PR_REG_ISID_LEN);
2074                 isid_ptr = &isid_buf[0];
2075         }
2076         /*
2077          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2078          */
2079         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2080         if (!pr_reg) {
2081                 if (res_key) {
2082                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2083                                 " for SA REGISTER, returning CONFLICT\n");
2084                         return TCM_RESERVATION_CONFLICT;
2085                 }
2086                 /*
2087                  * Do nothing but return GOOD status.
2088                  */
2089                 if (!sa_res_key)
2090                         return 0;
2091
2092                 if (!spec_i_pt) {
2093                         /*
2094                          * Perform the Service Action REGISTER on the Initiator
2095                          * Port Endpoint that the PRO was received from on the
2096                          * Logical Unit of the SCSI device server.
2097                          */
2098                         if (core_scsi3_alloc_registration(cmd->se_dev,
2099                                         se_sess->se_node_acl, cmd->se_lun,
2100                                         NULL, cmd->orig_fe_lun, isid_ptr,
2101                                         sa_res_key, all_tg_pt, aptpl,
2102                                         register_type, 0)) {
2103                                 pr_err("Unable to allocate"
2104                                         " struct t10_pr_registration\n");
2105                                 return TCM_INVALID_PARAMETER_LIST;
2106                         }
2107                 } else {
2108                         /*
2109                          * Register both the Initiator port that received
2110                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2111                          * TransportID from Parameter list and loop through
2112                          * fabric dependent parameter list while calling
2113                          * logic from of core_scsi3_alloc_registration() for
2114                          * each TransportID provided SCSI Initiator Port/Device
2115                          */
2116                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2117                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2118                         if (ret != 0)
2119                                 return ret;
2120                 }
2121                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2122         }
2123
2124         /* ok, existing registration */
2125
2126         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2127                 pr_err("SPC-3 PR REGISTER: Received"
2128                        " res_key: 0x%016Lx does not match"
2129                        " existing SA REGISTER res_key:"
2130                        " 0x%016Lx\n", res_key,
2131                        pr_reg->pr_res_key);
2132                 ret = TCM_RESERVATION_CONFLICT;
2133                 goto out;
2134         }
2135
2136         if (spec_i_pt) {
2137                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2138                         " set on a registered nexus\n");
2139                 ret = TCM_INVALID_PARAMETER_LIST;
2140                 goto out;
2141         }
2142
2143         /*
2144          * An existing ALL_TG_PT=1 registration being released
2145          * must also set ALL_TG_PT=1 in the incoming PROUT.
2146          */
2147         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2148                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2149                         " registration exists, but ALL_TG_PT=1 bit not"
2150                         " present in received PROUT\n");
2151                 ret = TCM_INVALID_CDB_FIELD;
2152                 goto out;
2153         }
2154
2155         /*
2156          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2157          */
2158         if (sa_res_key) {
2159                 /*
2160                  * Increment PRgeneration counter for struct se_device"
2161                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2162                  * READ_KEYS service action.
2163                  */
2164                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2165                 pr_reg->pr_res_key = sa_res_key;
2166                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2167                          " Key for %s to: 0x%016Lx PRgeneration:"
2168                          " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2169                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2170                          pr_reg->pr_reg_nacl->initiatorname,
2171                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2172
2173         } else {
2174                 /*
2175                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2176                  */
2177                 type = pr_reg->pr_res_type;
2178                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2179                                                               pr_reg);
2180                 if (pr_holder < 0) {
2181                         ret = TCM_RESERVATION_CONFLICT;
2182                         goto out;
2183                 }
2184
2185                 spin_lock(&pr_tmpl->registration_lock);
2186                 /*
2187                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2188                  * and matching pr_res_key.
2189                  */
2190                 if (pr_reg->pr_reg_all_tg_pt) {
2191                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2192                                         &pr_tmpl->registration_list,
2193                                         pr_reg_list) {
2194
2195                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2196                                         continue;
2197                                 if (pr_reg_p->pr_res_key != res_key)
2198                                         continue;
2199                                 if (pr_reg == pr_reg_p)
2200                                         continue;
2201                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2202                                            pr_reg_p->pr_reg_nacl->initiatorname))
2203                                         continue;
2204
2205                                 __core_scsi3_free_registration(dev,
2206                                                 pr_reg_p, NULL, 0);
2207                         }
2208                 }
2209
2210                 /*
2211                  * Release the calling I_T Nexus registration now..
2212                  */
2213                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2214                 pr_reg = NULL;
2215
2216                 /*
2217                  * From spc4r17, section 5.7.11.3 Unregistering
2218                  *
2219                  * If the persistent reservation is a registrants only
2220                  * type, the device server shall establish a unit
2221                  * attention condition for the initiator port associated
2222                  * with every registered I_T nexus except for the I_T
2223                  * nexus on which the PERSISTENT RESERVE OUT command was
2224                  * received, with the additional sense code set to
2225                  * RESERVATIONS RELEASED.
2226                  */
2227                 if (pr_holder &&
2228                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2229                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2230                         list_for_each_entry(pr_reg_p,
2231                                         &pr_tmpl->registration_list,
2232                                         pr_reg_list) {
2233
2234                                 target_ua_allocate_lun(
2235                                         pr_reg_p->pr_reg_nacl,
2236                                         pr_reg_p->pr_res_mapped_lun,
2237                                         0x2A,
2238                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2239                         }
2240                 }
2241
2242                 spin_unlock(&pr_tmpl->registration_lock);
2243         }
2244
2245         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2246
2247 out:
2248         if (pr_reg)
2249                 core_scsi3_put_pr_reg(pr_reg);
2250         return ret;
2251 }
2252
2253 unsigned char *core_scsi3_pr_dump_type(int type)
2254 {
2255         switch (type) {
2256         case PR_TYPE_WRITE_EXCLUSIVE:
2257                 return "Write Exclusive Access";
2258         case PR_TYPE_EXCLUSIVE_ACCESS:
2259                 return "Exclusive Access";
2260         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2261                 return "Write Exclusive Access, Registrants Only";
2262         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2263                 return "Exclusive Access, Registrants Only";
2264         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2265                 return "Write Exclusive Access, All Registrants";
2266         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2267                 return "Exclusive Access, All Registrants";
2268         default:
2269                 break;
2270         }
2271
2272         return "Unknown SPC-3 PR Type";
2273 }
2274
2275 static sense_reason_t
2276 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2277 {
2278         struct se_device *dev = cmd->se_dev;
2279         struct se_session *se_sess = cmd->se_sess;
2280         struct se_lun *se_lun = cmd->se_lun;
2281         struct t10_pr_registration *pr_reg, *pr_res_holder;
2282         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2283         char i_buf[PR_REG_ISID_ID_LEN];
2284         sense_reason_t ret;
2285
2286         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2287
2288         if (!se_sess || !se_lun) {
2289                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2290                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2291         }
2292         /*
2293          * Locate the existing *pr_reg via struct se_node_acl pointers
2294          */
2295         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2296                                 se_sess);
2297         if (!pr_reg) {
2298                 pr_err("SPC-3 PR: Unable to locate"
2299                         " PR_REGISTERED *pr_reg for RESERVE\n");
2300                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2301         }
2302         /*
2303          * From spc4r17 Section 5.7.9: Reserving:
2304          *
2305          * An application client creates a persistent reservation by issuing
2306          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2307          * a registered I_T nexus with the following parameters:
2308          *    a) RESERVATION KEY set to the value of the reservation key that is
2309          *       registered with the logical unit for the I_T nexus; and
2310          */
2311         if (res_key != pr_reg->pr_res_key) {
2312                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2313                         " does not match existing SA REGISTER res_key:"
2314                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2315                 ret = TCM_RESERVATION_CONFLICT;
2316                 goto out_put_pr_reg;
2317         }
2318         /*
2319          * From spc4r17 Section 5.7.9: Reserving:
2320          *
2321          * From above:
2322          *  b) TYPE field and SCOPE field set to the persistent reservation
2323          *     being created.
2324          *
2325          * Only one persistent reservation is allowed at a time per logical unit
2326          * and that persistent reservation has a scope of LU_SCOPE.
2327          */
2328         if (scope != PR_SCOPE_LU_SCOPE) {
2329                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2330                 ret = TCM_INVALID_PARAMETER_LIST;
2331                 goto out_put_pr_reg;
2332         }
2333         /*
2334          * See if we have an existing PR reservation holder pointer at
2335          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2336          * *pr_res_holder.
2337          */
2338         spin_lock(&dev->dev_reservation_lock);
2339         pr_res_holder = dev->dev_pr_res_holder;
2340         if (pr_res_holder) {
2341                 /*
2342                  * From spc4r17 Section 5.7.9: Reserving:
2343                  *
2344                  * If the device server receives a PERSISTENT RESERVE OUT
2345                  * command from an I_T nexus other than a persistent reservation
2346                  * holder (see 5.7.10) that attempts to create a persistent
2347                  * reservation when a persistent reservation already exists for
2348                  * the logical unit, then the command shall be completed with
2349                  * RESERVATION CONFLICT status.
2350                  */
2351                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2352                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2353                         pr_err("SPC-3 PR: Attempted RESERVE from"
2354                                 " [%s]: %s while reservation already held by"
2355                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2356                                 cmd->se_tfo->get_fabric_name(),
2357                                 se_sess->se_node_acl->initiatorname,
2358                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2359                                 pr_res_holder->pr_reg_nacl->initiatorname);
2360
2361                         spin_unlock(&dev->dev_reservation_lock);
2362                         ret = TCM_RESERVATION_CONFLICT;
2363                         goto out_put_pr_reg;
2364                 }
2365                 /*
2366                  * From spc4r17 Section 5.7.9: Reserving:
2367                  *
2368                  * If a persistent reservation holder attempts to modify the
2369                  * type or scope of an existing persistent reservation, the
2370                  * command shall be completed with RESERVATION CONFLICT status.
2371                  */
2372                 if ((pr_res_holder->pr_res_type != type) ||
2373                     (pr_res_holder->pr_res_scope != scope)) {
2374                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2375                         pr_err("SPC-3 PR: Attempted RESERVE from"
2376                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2377                                 " while reservation already held by [%s]: %s,"
2378                                 " returning RESERVATION_CONFLICT\n",
2379                                 cmd->se_tfo->get_fabric_name(),
2380                                 se_sess->se_node_acl->initiatorname,
2381                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2382                                 pr_res_holder->pr_reg_nacl->initiatorname);
2383
2384                         spin_unlock(&dev->dev_reservation_lock);
2385                         ret = TCM_RESERVATION_CONFLICT;
2386                         goto out_put_pr_reg;
2387                 }
2388                 /*
2389                  * From spc4r17 Section 5.7.9: Reserving:
2390                  *
2391                  * If the device server receives a PERSISTENT RESERVE OUT
2392                  * command with RESERVE service action where the TYPE field and
2393                  * the SCOPE field contain the same values as the existing type
2394                  * and scope from a persistent reservation holder, it shall not
2395                  * make any change to the existing persistent reservation and
2396                  * shall completethe command with GOOD status.
2397                  */
2398                 spin_unlock(&dev->dev_reservation_lock);
2399                 ret = 0;
2400                 goto out_put_pr_reg;
2401         }
2402         /*
2403          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2404          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2405          */
2406         pr_reg->pr_res_scope = scope;
2407         pr_reg->pr_res_type = type;
2408         pr_reg->pr_res_holder = 1;
2409         dev->dev_pr_res_holder = pr_reg;
2410         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2411
2412         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2413                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2414                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2415                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2416         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2417                         cmd->se_tfo->get_fabric_name(),
2418                         se_sess->se_node_acl->initiatorname,
2419                         i_buf);
2420         spin_unlock(&dev->dev_reservation_lock);
2421
2422         if (pr_tmpl->pr_aptpl_active)
2423                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2424
2425         ret = 0;
2426 out_put_pr_reg:
2427         core_scsi3_put_pr_reg(pr_reg);
2428         return ret;
2429 }
2430
2431 static sense_reason_t
2432 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2433                 u64 res_key)
2434 {
2435         switch (type) {
2436         case PR_TYPE_WRITE_EXCLUSIVE:
2437         case PR_TYPE_EXCLUSIVE_ACCESS:
2438         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2439         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2440         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2441         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2442                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2443         default:
2444                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2445                         " 0x%02x\n", type);
2446                 return TCM_INVALID_CDB_FIELD;
2447         }
2448 }
2449
2450 /*
2451  * Called with struct se_device->dev_reservation_lock held.
2452  */
2453 static void __core_scsi3_complete_pro_release(
2454         struct se_device *dev,
2455         struct se_node_acl *se_nacl,
2456         struct t10_pr_registration *pr_reg,
2457         int explicit,
2458         int unreg)
2459 {
2460         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2461         char i_buf[PR_REG_ISID_ID_LEN];
2462         int pr_res_type = 0, pr_res_scope = 0;
2463
2464         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2465         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2466         /*
2467          * Go ahead and release the current PR reservation holder.
2468          * If an All Registrants reservation is currently active and
2469          * a unregister operation is requested, replace the current
2470          * dev_pr_res_holder with another active registration.
2471          */
2472         if (dev->dev_pr_res_holder) {
2473                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2474                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2475                 dev->dev_pr_res_holder->pr_res_type = 0;
2476                 dev->dev_pr_res_holder->pr_res_scope = 0;
2477                 dev->dev_pr_res_holder->pr_res_holder = 0;
2478                 dev->dev_pr_res_holder = NULL;
2479         }
2480         if (!unreg)
2481                 goto out;
2482
2483         spin_lock(&dev->t10_pr.registration_lock);
2484         list_del_init(&pr_reg->pr_reg_list);
2485         /*
2486          * If the I_T nexus is a reservation holder, the persistent reservation
2487          * is of an all registrants type, and the I_T nexus is the last remaining
2488          * registered I_T nexus, then the device server shall also release the
2489          * persistent reservation.
2490          */
2491         if (!list_empty(&dev->t10_pr.registration_list) &&
2492             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2493              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2494                 dev->dev_pr_res_holder =
2495                         list_entry(dev->t10_pr.registration_list.next,
2496                                    struct t10_pr_registration, pr_reg_list);
2497                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2498                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2499                 dev->dev_pr_res_holder->pr_res_holder = 1;
2500         }
2501         spin_unlock(&dev->t10_pr.registration_lock);
2502 out:
2503         if (!dev->dev_pr_res_holder) {
2504                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2505                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2506                         tfo->get_fabric_name(), (explicit) ? "explicit" :
2507                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2508                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2509         }
2510         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2511                 tfo->get_fabric_name(), se_nacl->initiatorname,
2512                 i_buf);
2513         /*
2514          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2515          */
2516         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2517 }
2518
2519 static sense_reason_t
2520 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2521                 u64 res_key)
2522 {
2523         struct se_device *dev = cmd->se_dev;
2524         struct se_session *se_sess = cmd->se_sess;
2525         struct se_lun *se_lun = cmd->se_lun;
2526         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2527         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2528         sense_reason_t ret = 0;
2529
2530         if (!se_sess || !se_lun) {
2531                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2532                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2533         }
2534         /*
2535          * Locate the existing *pr_reg via struct se_node_acl pointers
2536          */
2537         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2538         if (!pr_reg) {
2539                 pr_err("SPC-3 PR: Unable to locate"
2540                         " PR_REGISTERED *pr_reg for RELEASE\n");
2541                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2542         }
2543         /*
2544          * From spc4r17 Section 5.7.11.2 Releasing:
2545          *
2546          * If there is no persistent reservation or in response to a persistent
2547          * reservation release request from a registered I_T nexus that is not a
2548          * persistent reservation holder (see 5.7.10), the device server shall
2549          * do the following:
2550          *
2551          *     a) Not release the persistent reservation, if any;
2552          *     b) Not remove any registrations; and
2553          *     c) Complete the command with GOOD status.
2554          */
2555         spin_lock(&dev->dev_reservation_lock);
2556         pr_res_holder = dev->dev_pr_res_holder;
2557         if (!pr_res_holder) {
2558                 /*
2559                  * No persistent reservation, return GOOD status.
2560                  */
2561                 spin_unlock(&dev->dev_reservation_lock);
2562                 goto out_put_pr_reg;
2563         }
2564
2565         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2566                 /*
2567                  * Release request from a registered I_T nexus that is not a
2568                  * persistent reservation holder. return GOOD status.
2569                  */
2570                 spin_unlock(&dev->dev_reservation_lock);
2571                 goto out_put_pr_reg;
2572         }
2573
2574         /*
2575          * From spc4r17 Section 5.7.11.2 Releasing:
2576          *
2577          * Only the persistent reservation holder (see 5.7.10) is allowed to
2578          * release a persistent reservation.
2579          *
2580          * An application client releases the persistent reservation by issuing
2581          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2582          * an I_T nexus that is a persistent reservation holder with the
2583          * following parameters:
2584          *
2585          *     a) RESERVATION KEY field set to the value of the reservation key
2586          *        that is registered with the logical unit for the I_T nexus;
2587          */
2588         if (res_key != pr_reg->pr_res_key) {
2589                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2590                         " does not match existing SA REGISTER res_key:"
2591                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2592                 spin_unlock(&dev->dev_reservation_lock);
2593                 ret = TCM_RESERVATION_CONFLICT;
2594                 goto out_put_pr_reg;
2595         }
2596         /*
2597          * From spc4r17 Section 5.7.11.2 Releasing and above:
2598          *
2599          * b) TYPE field and SCOPE field set to match the persistent
2600          *    reservation being released.
2601          */
2602         if ((pr_res_holder->pr_res_type != type) ||
2603             (pr_res_holder->pr_res_scope != scope)) {
2604                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2605                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2606                         " reservation from [%s]: %s with different TYPE "
2607                         "and/or SCOPE  while reservation already held by"
2608                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2609                         cmd->se_tfo->get_fabric_name(),
2610                         se_sess->se_node_acl->initiatorname,
2611                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2612                         pr_res_holder->pr_reg_nacl->initiatorname);
2613
2614                 spin_unlock(&dev->dev_reservation_lock);
2615                 ret = TCM_RESERVATION_CONFLICT;
2616                 goto out_put_pr_reg;
2617         }
2618         /*
2619          * In response to a persistent reservation release request from the
2620          * persistent reservation holder the device server shall perform a
2621          * release by doing the following as an uninterrupted series of actions:
2622          * a) Release the persistent reservation;
2623          * b) Not remove any registration(s);
2624          * c) If the released persistent reservation is a registrants only type
2625          * or all registrants type persistent reservation,
2626          *    the device server shall establish a unit attention condition for
2627          *    the initiator port associated with every regis-
2628          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2629          *    RESERVE OUT command with RELEASE service action was received,
2630          *    with the additional sense code set to RESERVATIONS RELEASED; and
2631          * d) If the persistent reservation is of any other type, the device
2632          *    server shall not establish a unit attention condition.
2633          */
2634         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2635                                           pr_reg, 1, 0);
2636
2637         spin_unlock(&dev->dev_reservation_lock);
2638
2639         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2640             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2641             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2642             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2643                 /*
2644                  * If no UNIT ATTENTION conditions will be established for
2645                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2646                  * go ahead and check for APTPL=1 update+write below
2647                  */
2648                 goto write_aptpl;
2649         }
2650
2651         spin_lock(&pr_tmpl->registration_lock);
2652         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2653                         pr_reg_list) {
2654                 /*
2655                  * Do not establish a UNIT ATTENTION condition
2656                  * for the calling I_T Nexus
2657                  */
2658                 if (pr_reg_p == pr_reg)
2659                         continue;
2660
2661                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2662                                 pr_reg_p->pr_res_mapped_lun,
2663                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2664         }
2665         spin_unlock(&pr_tmpl->registration_lock);
2666
2667 write_aptpl:
2668         if (pr_tmpl->pr_aptpl_active)
2669                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2670
2671 out_put_pr_reg:
2672         core_scsi3_put_pr_reg(pr_reg);
2673         return ret;
2674 }
2675
2676 static sense_reason_t
2677 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2678 {
2679         struct se_device *dev = cmd->se_dev;
2680         struct se_node_acl *pr_reg_nacl;
2681         struct se_session *se_sess = cmd->se_sess;
2682         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2683         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2684         u64 pr_res_mapped_lun = 0;
2685         int calling_it_nexus = 0;
2686         /*
2687          * Locate the existing *pr_reg via struct se_node_acl pointers
2688          */
2689         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2690                         se_sess->se_node_acl, se_sess);
2691         if (!pr_reg_n) {
2692                 pr_err("SPC-3 PR: Unable to locate"
2693                         " PR_REGISTERED *pr_reg for CLEAR\n");
2694                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2695         }
2696         /*
2697          * From spc4r17 section 5.7.11.6, Clearing:
2698          *
2699          * Any application client may release the persistent reservation and
2700          * remove all registrations from a device server by issuing a
2701          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2702          * registered I_T nexus with the following parameter:
2703          *
2704          *      a) RESERVATION KEY field set to the value of the reservation key
2705          *         that is registered with the logical unit for the I_T nexus.
2706          */
2707         if (res_key != pr_reg_n->pr_res_key) {
2708                 pr_err("SPC-3 PR REGISTER: Received"
2709                         " res_key: 0x%016Lx does not match"
2710                         " existing SA REGISTER res_key:"
2711                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2712                 core_scsi3_put_pr_reg(pr_reg_n);
2713                 return TCM_RESERVATION_CONFLICT;
2714         }
2715         /*
2716          * a) Release the persistent reservation, if any;
2717          */
2718         spin_lock(&dev->dev_reservation_lock);
2719         pr_res_holder = dev->dev_pr_res_holder;
2720         if (pr_res_holder) {
2721                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2722                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2723                                                   pr_res_holder, 0, 0);
2724         }
2725         spin_unlock(&dev->dev_reservation_lock);
2726         /*
2727          * b) Remove all registration(s) (see spc4r17 5.7.7);
2728          */
2729         spin_lock(&pr_tmpl->registration_lock);
2730         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2731                         &pr_tmpl->registration_list, pr_reg_list) {
2732
2733                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2734                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2735                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2736                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2737                                         calling_it_nexus);
2738                 /*
2739                  * e) Establish a unit attention condition for the initiator
2740                  *    port associated with every registered I_T nexus other
2741                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2742                  *    command with CLEAR service action was received, with the
2743                  *    additional sense code set to RESERVATIONS PREEMPTED.
2744                  */
2745                 if (!calling_it_nexus)
2746                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2747                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2748         }
2749         spin_unlock(&pr_tmpl->registration_lock);
2750
2751         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2752                 cmd->se_tfo->get_fabric_name());
2753
2754         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2755
2756         core_scsi3_pr_generation(dev);
2757         return 0;
2758 }
2759
2760 /*
2761  * Called with struct se_device->dev_reservation_lock held.
2762  */
2763 static void __core_scsi3_complete_pro_preempt(
2764         struct se_device *dev,
2765         struct t10_pr_registration *pr_reg,
2766         struct list_head *preempt_and_abort_list,
2767         int type,
2768         int scope,
2769         enum preempt_type preempt_type)
2770 {
2771         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2772         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2773         char i_buf[PR_REG_ISID_ID_LEN];
2774
2775         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2776         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2777         /*
2778          * Do an implicit RELEASE of the existing reservation.
2779          */
2780         if (dev->dev_pr_res_holder)
2781                 __core_scsi3_complete_pro_release(dev, nacl,
2782                                                   dev->dev_pr_res_holder, 0, 0);
2783
2784         dev->dev_pr_res_holder = pr_reg;
2785         pr_reg->pr_res_holder = 1;
2786         pr_reg->pr_res_type = type;
2787         pr_reg->pr_res_scope = scope;
2788
2789         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2790                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2791                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2792                 core_scsi3_pr_dump_type(type),
2793                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2794         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2795                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2796                 nacl->initiatorname, i_buf);
2797         /*
2798          * For PREEMPT_AND_ABORT, add the preempting reservation's
2799          * struct t10_pr_registration to the list that will be compared
2800          * against received CDBs..
2801          */
2802         if (preempt_and_abort_list)
2803                 list_add_tail(&pr_reg->pr_reg_abort_list,
2804                                 preempt_and_abort_list);
2805 }
2806
2807 static void core_scsi3_release_preempt_and_abort(
2808         struct list_head *preempt_and_abort_list,
2809         struct t10_pr_registration *pr_reg_holder)
2810 {
2811         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2812
2813         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2814                                 pr_reg_abort_list) {
2815
2816                 list_del(&pr_reg->pr_reg_abort_list);
2817                 if (pr_reg_holder == pr_reg)
2818                         continue;
2819                 if (pr_reg->pr_res_holder) {
2820                         pr_warn("pr_reg->pr_res_holder still set\n");
2821                         continue;
2822                 }
2823
2824                 pr_reg->pr_reg_deve = NULL;
2825                 pr_reg->pr_reg_nacl = NULL;
2826                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2827         }
2828 }
2829
2830 static sense_reason_t
2831 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2832                 u64 sa_res_key, enum preempt_type preempt_type)
2833 {
2834         struct se_device *dev = cmd->se_dev;
2835         struct se_node_acl *pr_reg_nacl;
2836         struct se_session *se_sess = cmd->se_sess;
2837         LIST_HEAD(preempt_and_abort_list);
2838         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2839         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2840         u64 pr_res_mapped_lun = 0;
2841         int all_reg = 0, calling_it_nexus = 0;
2842         bool sa_res_key_unmatched = sa_res_key != 0;
2843         int prh_type = 0, prh_scope = 0;
2844
2845         if (!se_sess)
2846                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2847
2848         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2849                                 se_sess);
2850         if (!pr_reg_n) {
2851                 pr_err("SPC-3 PR: Unable to locate"
2852                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2853                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2854                 return TCM_RESERVATION_CONFLICT;
2855         }
2856         if (pr_reg_n->pr_res_key != res_key) {
2857                 core_scsi3_put_pr_reg(pr_reg_n);
2858                 return TCM_RESERVATION_CONFLICT;
2859         }
2860         if (scope != PR_SCOPE_LU_SCOPE) {
2861                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2862                 core_scsi3_put_pr_reg(pr_reg_n);
2863                 return TCM_INVALID_PARAMETER_LIST;
2864         }
2865
2866         spin_lock(&dev->dev_reservation_lock);
2867         pr_res_holder = dev->dev_pr_res_holder;
2868         if (pr_res_holder &&
2869            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2870             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2871                 all_reg = 1;
2872
2873         if (!all_reg && !sa_res_key) {
2874                 spin_unlock(&dev->dev_reservation_lock);
2875                 core_scsi3_put_pr_reg(pr_reg_n);
2876                 return TCM_INVALID_PARAMETER_LIST;
2877         }
2878         /*
2879          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2880          *
2881          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2882          * persistent reservation holder or there is no persistent reservation
2883          * holder (i.e., there is no persistent reservation), then the device
2884          * server shall perform a preempt by doing the following in an
2885          * uninterrupted series of actions. (See below..)
2886          */
2887         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2888                 /*
2889                  * No existing or SA Reservation Key matching reservations..
2890                  *
2891                  * PROUT SA PREEMPT with All Registrant type reservations are
2892                  * allowed to be processed without a matching SA Reservation Key
2893                  */
2894                 spin_lock(&pr_tmpl->registration_lock);
2895                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2896                                 &pr_tmpl->registration_list, pr_reg_list) {
2897                         /*
2898                          * Removing of registrations in non all registrants
2899                          * type reservations without a matching SA reservation
2900                          * key.
2901                          *
2902                          * a) Remove the registrations for all I_T nexuses
2903                          *    specified by the SERVICE ACTION RESERVATION KEY
2904                          *    field;
2905                          * b) Ignore the contents of the SCOPE and TYPE fields;
2906                          * c) Process tasks as defined in 5.7.1; and
2907                          * d) Establish a unit attention condition for the
2908                          *    initiator port associated with every I_T nexus
2909                          *    that lost its registration other than the I_T
2910                          *    nexus on which the PERSISTENT RESERVE OUT command
2911                          *    was received, with the additional sense code set
2912                          *    to REGISTRATIONS PREEMPTED.
2913                          */
2914                         if (!all_reg) {
2915                                 if (pr_reg->pr_res_key != sa_res_key)
2916                                         continue;
2917                                 sa_res_key_unmatched = false;
2918
2919                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2920                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2921                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2922                                 __core_scsi3_free_registration(dev, pr_reg,
2923                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2924                                                 NULL, calling_it_nexus);
2925                         } else {
2926                                 /*
2927                                  * Case for any existing all registrants type
2928                                  * reservation, follow logic in spc4r17 section
2929                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2930                                  *
2931                                  * For a ZERO SA Reservation key, release
2932                                  * all other registrations and do an implicit
2933                                  * release of active persistent reservation.
2934                                  *
2935                                  * For a non-ZERO SA Reservation key, only
2936                                  * release the matching reservation key from
2937                                  * registrations.
2938                                  */
2939                                 if ((sa_res_key) &&
2940                                      (pr_reg->pr_res_key != sa_res_key))
2941                                         continue;
2942                                 sa_res_key_unmatched = false;
2943
2944                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2945                                 if (calling_it_nexus)
2946                                         continue;
2947
2948                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2949                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2950                                 __core_scsi3_free_registration(dev, pr_reg,
2951                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2952                                                 NULL, 0);
2953                         }
2954                         if (!calling_it_nexus)
2955                                 target_ua_allocate_lun(pr_reg_nacl,
2956                                         pr_res_mapped_lun, 0x2A,
2957                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2958                 }
2959                 spin_unlock(&pr_tmpl->registration_lock);
2960                 /*
2961                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2962                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2963                  * RESERVATION KEY field to a value that does not match any
2964                  * registered reservation key, then the device server shall
2965                  * complete the command with RESERVATION CONFLICT status.
2966                  */
2967                 if (sa_res_key_unmatched) {
2968                         spin_unlock(&dev->dev_reservation_lock);
2969                         core_scsi3_put_pr_reg(pr_reg_n);
2970                         return TCM_RESERVATION_CONFLICT;
2971                 }
2972                 /*
2973                  * For an existing all registrants type reservation
2974                  * with a zero SA rservation key, preempt the existing
2975                  * reservation with the new PR type and scope.
2976                  */
2977                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2978                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2979                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2980                                 type, scope, preempt_type);
2981
2982                         if (preempt_type == PREEMPT_AND_ABORT)
2983                                 core_scsi3_release_preempt_and_abort(
2984                                         &preempt_and_abort_list, pr_reg_n);
2985                 }
2986                 spin_unlock(&dev->dev_reservation_lock);
2987
2988                 if (pr_tmpl->pr_aptpl_active)
2989                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2990
2991                 core_scsi3_put_pr_reg(pr_reg_n);
2992                 core_scsi3_pr_generation(cmd->se_dev);
2993                 return 0;
2994         }
2995         /*
2996          * The PREEMPTing SA reservation key matches that of the
2997          * existing persistent reservation, first, we check if
2998          * we are preempting our own reservation.
2999          * From spc4r17, section 5.7.11.4.3 Preempting
3000          * persistent reservations and registration handling
3001          *
3002          * If an all registrants persistent reservation is not
3003          * present, it is not an error for the persistent
3004          * reservation holder to preempt itself (i.e., a
3005          * PERSISTENT RESERVE OUT with a PREEMPT service action
3006          * or a PREEMPT AND ABORT service action with the
3007          * SERVICE ACTION RESERVATION KEY value equal to the
3008          * persistent reservation holder's reservation key that
3009          * is received from the persistent reservation holder).
3010          * In that case, the device server shall establish the
3011          * new persistent reservation and maintain the
3012          * registration.
3013          */
3014         prh_type = pr_res_holder->pr_res_type;
3015         prh_scope = pr_res_holder->pr_res_scope;
3016         /*
3017          * If the SERVICE ACTION RESERVATION KEY field identifies a
3018          * persistent reservation holder (see 5.7.10), the device
3019          * server shall perform a preempt by doing the following as
3020          * an uninterrupted series of actions:
3021          *
3022          * a) Release the persistent reservation for the holder
3023          *    identified by the SERVICE ACTION RESERVATION KEY field;
3024          */
3025         if (pr_reg_n != pr_res_holder)
3026                 __core_scsi3_complete_pro_release(dev,
3027                                                   pr_res_holder->pr_reg_nacl,
3028                                                   dev->dev_pr_res_holder, 0, 0);
3029         /*
3030          * b) Remove the registrations for all I_T nexuses identified
3031          *    by the SERVICE ACTION RESERVATION KEY field, except the
3032          *    I_T nexus that is being used for the PERSISTENT RESERVE
3033          *    OUT command. If an all registrants persistent reservation
3034          *    is present and the SERVICE ACTION RESERVATION KEY field
3035          *    is set to zero, then all registrations shall be removed
3036          *    except for that of the I_T nexus that is being used for
3037          *    the PERSISTENT RESERVE OUT command;
3038          */
3039         spin_lock(&pr_tmpl->registration_lock);
3040         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3041                         &pr_tmpl->registration_list, pr_reg_list) {
3042
3043                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3044                 if (calling_it_nexus)
3045                         continue;
3046
3047                 if (pr_reg->pr_res_key != sa_res_key)
3048                         continue;
3049
3050                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3051                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3052                 __core_scsi3_free_registration(dev, pr_reg,
3053                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3054                                 calling_it_nexus);
3055                 /*
3056                  * e) Establish a unit attention condition for the initiator
3057                  *    port associated with every I_T nexus that lost its
3058                  *    persistent reservation and/or registration, with the
3059                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3060                  */
3061                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3062                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3063         }
3064         spin_unlock(&pr_tmpl->registration_lock);
3065         /*
3066          * c) Establish a persistent reservation for the preempting
3067          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3068          */
3069         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3070                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3071                         type, scope, preempt_type);
3072         /*
3073          * d) Process tasks as defined in 5.7.1;
3074          * e) See above..
3075          * f) If the type or scope has changed, then for every I_T nexus
3076          *    whose reservation key was not removed, except for the I_T
3077          *    nexus on which the PERSISTENT RESERVE OUT command was
3078          *    received, the device server shall establish a unit
3079          *    attention condition for the initiator port associated with
3080          *    that I_T nexus, with the additional sense code set to
3081          *    RESERVATIONS RELEASED. If the type or scope have not
3082          *    changed, then no unit attention condition(s) shall be
3083          *    established for this reason.
3084          */
3085         if ((prh_type != type) || (prh_scope != scope)) {
3086                 spin_lock(&pr_tmpl->registration_lock);
3087                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3088                                 &pr_tmpl->registration_list, pr_reg_list) {
3089
3090                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3091                         if (calling_it_nexus)
3092                                 continue;
3093
3094                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3095                                         pr_reg->pr_res_mapped_lun, 0x2A,
3096                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3097                 }
3098                 spin_unlock(&pr_tmpl->registration_lock);
3099         }
3100         spin_unlock(&dev->dev_reservation_lock);
3101         /*
3102          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3103          * All received CDBs for the matching existing reservation and
3104          * registrations undergo ABORT_TASK logic.
3105          *
3106          * From there, core_scsi3_release_preempt_and_abort() will
3107          * release every registration in the list (which have already
3108          * been removed from the primary pr_reg list), except the
3109          * new persistent reservation holder, the calling Initiator Port.
3110          */
3111         if (preempt_type == PREEMPT_AND_ABORT) {
3112                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3113                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3114                                                 pr_reg_n);
3115         }
3116
3117         if (pr_tmpl->pr_aptpl_active)
3118                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3119
3120         core_scsi3_put_pr_reg(pr_reg_n);
3121         core_scsi3_pr_generation(cmd->se_dev);
3122         return 0;
3123 }
3124
3125 static sense_reason_t
3126 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3127                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3128 {
3129         switch (type) {
3130         case PR_TYPE_WRITE_EXCLUSIVE:
3131         case PR_TYPE_EXCLUSIVE_ACCESS:
3132         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3133         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3134         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3135         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3136                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3137                                               sa_res_key, preempt_type);
3138         default:
3139                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3140                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3141                 return TCM_INVALID_CDB_FIELD;
3142         }
3143 }
3144
3145
3146 static sense_reason_t
3147 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3148                 u64 sa_res_key, int aptpl, int unreg)
3149 {
3150         struct se_session *se_sess = cmd->se_sess;
3151         struct se_device *dev = cmd->se_dev;
3152         struct se_dev_entry *dest_se_deve = NULL;
3153         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3154         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3155         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3156         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3157         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3158         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3159         unsigned char *buf;
3160         const unsigned char *initiator_str;
3161         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
3162         u32 tid_len, tmp_tid_len;
3163         int new_reg = 0, type, scope, matching_iname;
3164         sense_reason_t ret;
3165         unsigned short rtpi;
3166         unsigned char proto_ident;
3167
3168         if (!se_sess || !se_lun) {
3169                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3170                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3171         }
3172
3173         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3174         se_tpg = se_sess->se_tpg;
3175         tf_ops = se_tpg->se_tpg_tfo;
3176         /*
3177          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3178          *      Register behaviors for a REGISTER AND MOVE service action
3179          *
3180          * Locate the existing *pr_reg via struct se_node_acl pointers
3181          */
3182         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3183                                 se_sess);
3184         if (!pr_reg) {
3185                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3186                         " *pr_reg for REGISTER_AND_MOVE\n");
3187                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3188         }
3189         /*
3190          * The provided reservation key much match the existing reservation key
3191          * provided during this initiator's I_T nexus registration.
3192          */
3193         if (res_key != pr_reg->pr_res_key) {
3194                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3195                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3196                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3197                 ret = TCM_RESERVATION_CONFLICT;
3198                 goto out_put_pr_reg;
3199         }
3200         /*
3201          * The service active reservation key needs to be non zero
3202          */
3203         if (!sa_res_key) {
3204                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3205                         " sa_res_key\n");
3206                 ret = TCM_INVALID_PARAMETER_LIST;
3207                 goto out_put_pr_reg;
3208         }
3209
3210         /*
3211          * Determine the Relative Target Port Identifier where the reservation
3212          * will be moved to for the TransportID containing SCSI initiator WWN
3213          * information.
3214          */
3215         buf = transport_kmap_data_sg(cmd);
3216         if (!buf) {
3217                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3218                 goto out_put_pr_reg;
3219         }
3220
3221         rtpi = get_unaligned_be16(&buf[18]);
3222         tid_len = get_unaligned_be32(&buf[20]);
3223         transport_kunmap_data_sg(cmd);
3224         buf = NULL;
3225
3226         if ((tid_len + 24) != cmd->data_length) {
3227                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3228                         " does not equal CDB data_length: %u\n", tid_len,
3229                         cmd->data_length);
3230                 ret = TCM_INVALID_PARAMETER_LIST;
3231                 goto out_put_pr_reg;
3232         }
3233
3234         spin_lock(&dev->se_port_lock);
3235         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3236                 if (tmp_lun->lun_rtpi != rtpi)
3237                         continue;
3238                 dest_se_tpg = tmp_lun->lun_tpg;
3239                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3240                 if (!dest_tf_ops)
3241                         continue;
3242
3243                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3244                 spin_unlock(&dev->se_port_lock);
3245
3246                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3247                         pr_err("core_scsi3_tpg_depend_item() failed"
3248                                 " for dest_se_tpg\n");
3249                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3250                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3251                         goto out_put_pr_reg;
3252                 }
3253
3254                 spin_lock(&dev->se_port_lock);
3255                 break;
3256         }
3257         spin_unlock(&dev->se_port_lock);
3258
3259         if (!dest_se_tpg || !dest_tf_ops) {
3260                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3261                         " fabric ops from Relative Target Port Identifier:"
3262                         " %hu\n", rtpi);
3263                 ret = TCM_INVALID_PARAMETER_LIST;
3264                 goto out_put_pr_reg;
3265         }
3266
3267         buf = transport_kmap_data_sg(cmd);
3268         if (!buf) {
3269                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3270                 goto out_put_pr_reg;
3271         }
3272         proto_ident = (buf[24] & 0x0f);
3273
3274         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3275                         " 0x%02x\n", proto_ident);
3276
3277         if (proto_ident != dest_se_tpg->proto_id) {
3278                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3279                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3280                         " from fabric: %s\n", proto_ident,
3281                         dest_se_tpg->proto_id,
3282                         dest_tf_ops->get_fabric_name());
3283                 ret = TCM_INVALID_PARAMETER_LIST;
3284                 goto out;
3285         }
3286         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3287                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3288         if (!initiator_str) {
3289                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3290                         " initiator_str from Transport ID\n");
3291                 ret = TCM_INVALID_PARAMETER_LIST;
3292                 goto out;
3293         }
3294
3295         transport_kunmap_data_sg(cmd);
3296         buf = NULL;
3297
3298         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3299                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3300                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3301                 iport_ptr : "");
3302         /*
3303          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3304          * action specifies a TransportID that is the same as the initiator port
3305          * of the I_T nexus for the command received, then the command shall
3306          * be terminated with CHECK CONDITION status, with the sense key set to
3307          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3308          * IN PARAMETER LIST.
3309          */
3310         pr_reg_nacl = pr_reg->pr_reg_nacl;
3311         matching_iname = (!strcmp(initiator_str,
3312                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3313         if (!matching_iname)
3314                 goto after_iport_check;
3315
3316         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3317                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3318                         " matches: %s on received I_T Nexus\n", initiator_str,
3319                         pr_reg_nacl->initiatorname);
3320                 ret = TCM_INVALID_PARAMETER_LIST;
3321                 goto out;
3322         }
3323         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3324                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3325                         " matches: %s %s on received I_T Nexus\n",
3326                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3327                         pr_reg->pr_reg_isid);
3328                 ret = TCM_INVALID_PARAMETER_LIST;
3329                 goto out;
3330         }
3331 after_iport_check:
3332         /*
3333          * Locate the destination struct se_node_acl from the received Transport ID
3334          */
3335         mutex_lock(&dest_se_tpg->acl_node_mutex);
3336         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3337                                 initiator_str);
3338         if (dest_node_acl)
3339                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3340         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3341
3342         if (!dest_node_acl) {
3343                 pr_err("Unable to locate %s dest_node_acl for"
3344                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3345                         initiator_str);
3346                 ret = TCM_INVALID_PARAMETER_LIST;
3347                 goto out;
3348         }
3349
3350         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3351                 pr_err("core_scsi3_nodeacl_depend_item() for"
3352                         " dest_node_acl\n");
3353                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3354                 dest_node_acl = NULL;
3355                 ret = TCM_INVALID_PARAMETER_LIST;
3356                 goto out;
3357         }
3358
3359         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3360                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3361                 dest_node_acl->initiatorname);
3362
3363         /*
3364          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3365          * PORT IDENTIFIER.
3366          */
3367         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3368         if (!dest_se_deve) {
3369                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3370                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3371                 ret = TCM_INVALID_PARAMETER_LIST;
3372                 goto out;
3373         }
3374
3375         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3376                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3377                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3378                 dest_se_deve = NULL;
3379                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3380                 goto out;
3381         }
3382
3383         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3384                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3385                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3386                 dest_se_deve->mapped_lun);
3387
3388         /*
3389          * A persistent reservation needs to already existing in order to
3390          * successfully complete the REGISTER_AND_MOVE service action..
3391          */
3392         spin_lock(&dev->dev_reservation_lock);
3393         pr_res_holder = dev->dev_pr_res_holder;
3394         if (!pr_res_holder) {
3395                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3396                         " currently held\n");
3397                 spin_unlock(&dev->dev_reservation_lock);
3398                 ret = TCM_INVALID_CDB_FIELD;
3399                 goto out;
3400         }
3401         /*
3402          * The received on I_T Nexus must be the reservation holder.
3403          *
3404          * From spc4r17 section 5.7.8  Table 50 --
3405          *      Register behaviors for a REGISTER AND MOVE service action
3406          */
3407         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3408                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3409                         " Nexus is not reservation holder\n");
3410                 spin_unlock(&dev->dev_reservation_lock);
3411                 ret = TCM_RESERVATION_CONFLICT;
3412                 goto out;
3413         }
3414         /*
3415          * From spc4r17 section 5.7.8: registering and moving reservation
3416          *
3417          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3418          * action is received and the established persistent reservation is a
3419          * Write Exclusive - All Registrants type or Exclusive Access -
3420          * All Registrants type reservation, then the command shall be completed
3421          * with RESERVATION CONFLICT status.
3422          */
3423         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3424             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3425                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3426                         " reservation for type: %s\n",
3427                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3428                 spin_unlock(&dev->dev_reservation_lock);
3429                 ret = TCM_RESERVATION_CONFLICT;
3430                 goto out;
3431         }
3432         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3433         /*
3434          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3435          */
3436         type = pr_res_holder->pr_res_type;
3437         scope = pr_res_holder->pr_res_type;
3438         /*
3439          * c) Associate the reservation key specified in the SERVICE ACTION
3440          *    RESERVATION KEY field with the I_T nexus specified as the
3441          *    destination of the register and move, where:
3442          *    A) The I_T nexus is specified by the TransportID and the
3443          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3444          *    B) Regardless of the TransportID format used, the association for
3445          *       the initiator port is based on either the initiator port name
3446          *       (see 3.1.71) on SCSI transport protocols where port names are
3447          *       required or the initiator port identifier (see 3.1.70) on SCSI
3448          *       transport protocols where port names are not required;
3449          * d) Register the reservation key specified in the SERVICE ACTION
3450          *    RESERVATION KEY field;
3451          * e) Retain the reservation key specified in the SERVICE ACTION
3452          *    RESERVATION KEY field and associated information;
3453          *
3454          * Also, It is not an error for a REGISTER AND MOVE service action to
3455          * register an I_T nexus that is already registered with the same
3456          * reservation key or a different reservation key.
3457          */
3458         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3459                                         iport_ptr);
3460         if (!dest_pr_reg) {
3461                 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
3462                                 kref_read(&dest_se_deve->pr_kref) != 0);
3463
3464                 spin_unlock(&dev->dev_reservation_lock);
3465                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3466                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3467                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3468                         ret = TCM_INVALID_PARAMETER_LIST;
3469                         goto out;
3470                 }
3471                 spin_lock(&dev->dev_reservation_lock);
3472                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3473                                                 iport_ptr);
3474                 new_reg = 1;
3475         }
3476         /*
3477          * f) Release the persistent reservation for the persistent reservation
3478          *    holder (i.e., the I_T nexus on which the
3479          */
3480         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3481                                           dev->dev_pr_res_holder, 0, 0);
3482         /*
3483          * g) Move the persistent reservation to the specified I_T nexus using
3484          *    the same scope and type as the persistent reservation released in
3485          *    item f); and
3486          */
3487         dev->dev_pr_res_holder = dest_pr_reg;
3488         dest_pr_reg->pr_res_holder = 1;
3489         dest_pr_reg->pr_res_type = type;
3490         pr_reg->pr_res_scope = scope;
3491         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3492         /*
3493          * Increment PRGeneration for existing registrations..
3494          */
3495         if (!new_reg)
3496                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3497         spin_unlock(&dev->dev_reservation_lock);
3498
3499         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3500                 " created new reservation holder TYPE: %s on object RTPI:"
3501                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3502                 core_scsi3_pr_dump_type(type), rtpi,
3503                 dest_pr_reg->pr_res_generation);
3504         pr_debug("SPC-3 PR Successfully moved reservation from"
3505                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3506                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3507                 i_buf, dest_tf_ops->get_fabric_name(),
3508                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3509                 iport_ptr : "");
3510         /*
3511          * It is now safe to release configfs group dependencies for destination
3512          * of Transport ID Initiator Device/Port Identifier
3513          */
3514         core_scsi3_lunacl_undepend_item(dest_se_deve);
3515         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3516         core_scsi3_tpg_undepend_item(dest_se_tpg);
3517         /*
3518          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3519          * nexus on which PERSISTENT RESERVE OUT command was received.
3520          */
3521         if (unreg) {
3522                 spin_lock(&pr_tmpl->registration_lock);
3523                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3524                 spin_unlock(&pr_tmpl->registration_lock);
3525         } else
3526                 core_scsi3_put_pr_reg(pr_reg);
3527
3528         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3529
3530         transport_kunmap_data_sg(cmd);
3531
3532         core_scsi3_put_pr_reg(dest_pr_reg);
3533         return 0;
3534 out:
3535         if (buf)
3536                 transport_kunmap_data_sg(cmd);
3537         if (dest_se_deve)
3538                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3539         if (dest_node_acl)
3540                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3541         core_scsi3_tpg_undepend_item(dest_se_tpg);
3542
3543 out_put_pr_reg:
3544         core_scsi3_put_pr_reg(pr_reg);
3545         return ret;
3546 }
3547
3548 /*
3549  * See spc4r17 section 6.14 Table 170
3550  */
3551 sense_reason_t
3552 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3553 {
3554         struct se_device *dev = cmd->se_dev;
3555         unsigned char *cdb = &cmd->t_task_cdb[0];
3556         unsigned char *buf;
3557         u64 res_key, sa_res_key;
3558         int sa, scope, type, aptpl;
3559         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3560         sense_reason_t ret;
3561
3562         /*
3563          * Following spc2r20 5.5.1 Reservations overview:
3564          *
3565          * If a logical unit has been reserved by any RESERVE command and is
3566          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3567          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3568          * initiator or service action and shall terminate with a RESERVATION
3569          * CONFLICT status.
3570          */
3571         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3572                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3573                         " SPC-2 reservation is held, returning"
3574                         " RESERVATION_CONFLICT\n");
3575                 return TCM_RESERVATION_CONFLICT;
3576         }
3577
3578         /*
3579          * FIXME: A NULL struct se_session pointer means an this is not coming from
3580          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3581          */
3582         if (!cmd->se_sess)
3583                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3584
3585         if (cmd->data_length < 24) {
3586                 pr_warn("SPC-PR: Received PR OUT parameter list"
3587                         " length too small: %u\n", cmd->data_length);
3588                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3589         }
3590
3591         /*
3592          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3593          */
3594         sa = (cdb[1] & 0x1f);
3595         scope = (cdb[2] & 0xf0);
3596         type = (cdb[2] & 0x0f);
3597
3598         buf = transport_kmap_data_sg(cmd);
3599         if (!buf)
3600                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3601
3602         /*
3603          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3604          */
3605         res_key = get_unaligned_be64(&buf[0]);
3606         sa_res_key = get_unaligned_be64(&buf[8]);
3607         /*
3608          * REGISTER_AND_MOVE uses a different SA parameter list containing
3609          * SCSI TransportIDs.
3610          */
3611         if (sa != PRO_REGISTER_AND_MOVE) {
3612                 spec_i_pt = (buf[20] & 0x08);
3613                 all_tg_pt = (buf[20] & 0x04);
3614                 aptpl = (buf[20] & 0x01);
3615         } else {
3616                 aptpl = (buf[17] & 0x01);
3617                 unreg = (buf[17] & 0x02);
3618         }
3619         /*
3620          * If the backend device has been configured to force APTPL metadata
3621          * write-out, go ahead and propigate aptpl=1 down now.
3622          */
3623         if (dev->dev_attrib.force_pr_aptpl)
3624                 aptpl = 1;
3625
3626         transport_kunmap_data_sg(cmd);
3627         buf = NULL;
3628
3629         /*
3630          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3631          */
3632         if (spec_i_pt && (sa != PRO_REGISTER))
3633                 return TCM_INVALID_PARAMETER_LIST;
3634
3635         /*
3636          * From spc4r17 section 6.14:
3637          *
3638          * If the SPEC_I_PT bit is set to zero, the service action is not
3639          * REGISTER AND MOVE, and the parameter list length is not 24, then
3640          * the command shall be terminated with CHECK CONDITION status, with
3641          * the sense key set to ILLEGAL REQUEST, and the additional sense
3642          * code set to PARAMETER LIST LENGTH ERROR.
3643          */
3644         if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
3645             (cmd->data_length != 24)) {
3646                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3647                         " list length: %u\n", cmd->data_length);
3648                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3649         }
3650
3651         /*
3652          * (core_scsi3_emulate_pro_* function parameters
3653          * are defined by spc4r17 Table 174:
3654          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3655          */
3656         switch (sa) {
3657         case PRO_REGISTER:
3658                 ret = core_scsi3_emulate_pro_register(cmd,
3659                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3660                 break;
3661         case PRO_RESERVE:
3662                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3663                 break;
3664         case PRO_RELEASE:
3665                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3666                 break;
3667         case PRO_CLEAR:
3668                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3669                 break;
3670         case PRO_PREEMPT:
3671                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3672                                         res_key, sa_res_key, PREEMPT);
3673                 break;
3674         case PRO_PREEMPT_AND_ABORT:
3675                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3676                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3677                 break;
3678         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3679                 ret = core_scsi3_emulate_pro_register(cmd,
3680                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3681                 break;
3682         case PRO_REGISTER_AND_MOVE:
3683                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3684                                 sa_res_key, aptpl, unreg);
3685                 break;
3686         default:
3687                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3688                         " action: 0x%02x\n", sa);
3689                 return TCM_INVALID_CDB_FIELD;
3690         }
3691
3692         if (!ret)
3693                 target_complete_cmd(cmd, GOOD);
3694         return ret;
3695 }
3696
3697 /*
3698  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3699  *
3700  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3701  */
3702 static sense_reason_t
3703 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3704 {
3705         struct se_device *dev = cmd->se_dev;
3706         struct t10_pr_registration *pr_reg;
3707         unsigned char *buf;
3708         u32 add_len = 0, off = 8;
3709
3710         if (cmd->data_length < 8) {
3711                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3712                         " too small\n", cmd->data_length);
3713                 return TCM_INVALID_CDB_FIELD;
3714         }
3715
3716         buf = transport_kmap_data_sg(cmd);
3717         if (!buf)
3718                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3719
3720         put_unaligned_be32(dev->t10_pr.pr_generation, buf);
3721
3722         spin_lock(&dev->t10_pr.registration_lock);
3723         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3724                         pr_reg_list) {
3725                 /*
3726                  * Check for overflow of 8byte PRI READ_KEYS payload and
3727                  * next reservation key list descriptor.
3728                  */
3729                 if ((add_len + 8) > (cmd->data_length - 8))
3730                         break;
3731
3732                 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3733                 off += 8;
3734                 add_len += 8;
3735         }
3736         spin_unlock(&dev->t10_pr.registration_lock);
3737
3738         put_unaligned_be32(add_len, &buf[4]);
3739
3740         transport_kunmap_data_sg(cmd);
3741
3742         return 0;
3743 }
3744
3745 /*
3746  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3747  *
3748  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3749  */
3750 static sense_reason_t
3751 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3752 {
3753         struct se_device *dev = cmd->se_dev;
3754         struct t10_pr_registration *pr_reg;
3755         unsigned char *buf;
3756         u64 pr_res_key;
3757         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3758
3759         if (cmd->data_length < 8) {
3760                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3761                         " too small\n", cmd->data_length);
3762                 return TCM_INVALID_CDB_FIELD;
3763         }
3764
3765         buf = transport_kmap_data_sg(cmd);
3766         if (!buf)
3767                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3768
3769         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3770
3771         spin_lock(&dev->dev_reservation_lock);
3772         pr_reg = dev->dev_pr_res_holder;
3773         if (pr_reg) {
3774                 /*
3775                  * Set the hardcoded Additional Length
3776                  */
3777                 put_unaligned_be32(add_len, &buf[4]);
3778
3779                 if (cmd->data_length < 22)
3780                         goto err;
3781
3782                 /*
3783                  * Set the Reservation key.
3784                  *
3785                  * From spc4r17, section 5.7.10:
3786                  * A persistent reservation holder has its reservation key
3787                  * returned in the parameter data from a PERSISTENT
3788                  * RESERVE IN command with READ RESERVATION service action as
3789                  * follows:
3790                  * a) For a persistent reservation of the type Write Exclusive
3791                  *    - All Registrants or Exclusive Access  All Regitrants,
3792                  *      the reservation key shall be set to zero; or
3793                  * b) For all other persistent reservation types, the
3794                  *    reservation key shall be set to the registered
3795                  *    reservation key for the I_T nexus that holds the
3796                  *    persistent reservation.
3797                  */
3798                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3799                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3800                         pr_res_key = 0;
3801                 else
3802                         pr_res_key = pr_reg->pr_res_key;
3803
3804                 put_unaligned_be64(pr_res_key, &buf[8]);
3805                 /*
3806                  * Set the SCOPE and TYPE
3807                  */
3808                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3809                           (pr_reg->pr_res_type & 0x0f);
3810         }
3811
3812 err:
3813         spin_unlock(&dev->dev_reservation_lock);
3814         transport_kunmap_data_sg(cmd);
3815
3816         return 0;
3817 }
3818
3819 /*
3820  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3821  *
3822  * See spc4r17 section 6.13.4 Table 165
3823  */
3824 static sense_reason_t
3825 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3826 {
3827         struct se_device *dev = cmd->se_dev;
3828         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3829         unsigned char *buf;
3830         u16 add_len = 8; /* Hardcoded to 8. */
3831
3832         if (cmd->data_length < 6) {
3833                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3834                         " %u too small\n", cmd->data_length);
3835                 return TCM_INVALID_CDB_FIELD;
3836         }
3837
3838         buf = transport_kmap_data_sg(cmd);
3839         if (!buf)
3840                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3841
3842         put_unaligned_be16(add_len, &buf[0]);
3843         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3844         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3845         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3846         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3847         /*
3848          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3849          * set the TMV: Task Mask Valid bit.
3850          */
3851         buf[3] |= 0x80;
3852         /*
3853          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3854          */
3855         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3856         /*
3857          * PTPL_A: Persistence across Target Power Loss Active bit
3858          */
3859         if (pr_tmpl->pr_aptpl_active)
3860                 buf[3] |= 0x01;
3861         /*
3862          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3863          */
3864         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3865         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3866         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3867         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3868         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3869         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3870
3871         transport_kunmap_data_sg(cmd);
3872
3873         return 0;
3874 }
3875
3876 /*
3877  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3878  *
3879  * See spc4r17 section 6.13.5 Table 168 and 169
3880  */
3881 static sense_reason_t
3882 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3883 {
3884         struct se_device *dev = cmd->se_dev;
3885         struct se_node_acl *se_nacl;
3886         struct se_portal_group *se_tpg;
3887         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3888         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3889         unsigned char *buf;
3890         u32 add_desc_len = 0, add_len = 0;
3891         u32 off = 8; /* off into first Full Status descriptor */
3892         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3893         int exp_desc_len, desc_len;
3894         bool all_reg = false;
3895
3896         if (cmd->data_length < 8) {
3897                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3898                         " too small\n", cmd->data_length);
3899                 return TCM_INVALID_CDB_FIELD;
3900         }
3901
3902         buf = transport_kmap_data_sg(cmd);
3903         if (!buf)
3904                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3905
3906         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3907
3908         spin_lock(&dev->dev_reservation_lock);
3909         if (dev->dev_pr_res_holder) {
3910                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3911
3912                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3913                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3914                         all_reg = true;
3915                         pr_res_type = pr_holder->pr_res_type;
3916                         pr_res_scope = pr_holder->pr_res_scope;
3917                 }
3918         }
3919         spin_unlock(&dev->dev_reservation_lock);
3920
3921         spin_lock(&pr_tmpl->registration_lock);
3922         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3923                         &pr_tmpl->registration_list, pr_reg_list) {
3924
3925                 se_nacl = pr_reg->pr_reg_nacl;
3926                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3927                 add_desc_len = 0;
3928
3929                 atomic_inc_mb(&pr_reg->pr_res_holders);
3930                 spin_unlock(&pr_tmpl->registration_lock);
3931                 /*
3932                  * Determine expected length of $FABRIC_MOD specific
3933                  * TransportID full status descriptor..
3934                  */
3935                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3936                                         &format_code);
3937                 if (exp_desc_len < 0 ||
3938                     exp_desc_len + add_len > cmd->data_length) {
3939                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3940                                 " out of buffer: %d\n", cmd->data_length);
3941                         spin_lock(&pr_tmpl->registration_lock);
3942                         atomic_dec_mb(&pr_reg->pr_res_holders);
3943                         break;
3944                 }
3945                 /*
3946                  * Set RESERVATION KEY
3947                  */
3948                 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3949                 off += 8;
3950                 off += 4; /* Skip Over Reserved area */
3951
3952                 /*
3953                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3954                  */
3955                 if (pr_reg->pr_reg_all_tg_pt)
3956                         buf[off] = 0x02;
3957                 /*
3958                  * The struct se_lun pointer will be present for the
3959                  * reservation holder for PR_HOLDER bit.
3960                  *
3961                  * Also, if this registration is the reservation
3962                  * holder or there is an All Registrants reservation
3963                  * active, fill in SCOPE and TYPE in the next byte.
3964                  */
3965                 if (pr_reg->pr_res_holder) {
3966                         buf[off++] |= 0x01;
3967                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3968                                      (pr_reg->pr_res_type & 0x0f);
3969                 } else if (all_reg) {
3970                         buf[off++] |= 0x01;
3971                         buf[off++] = (pr_res_scope & 0xf0) |
3972                                      (pr_res_type & 0x0f);
3973                 } else {
3974                         off += 2;
3975                 }
3976
3977                 off += 4; /* Skip over reserved area */
3978                 /*
3979                  * From spc4r17 6.3.15:
3980                  *
3981                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3982                  * IDENTIFIER field contains the relative port identifier (see
3983                  * 3.1.120) of the target port that is part of the I_T nexus
3984                  * described by this full status descriptor. If the ALL_TG_PT
3985                  * bit is set to one, the contents of the RELATIVE TARGET PORT
3986                  * IDENTIFIER field are not defined by this standard.
3987                  */
3988                 if (!pr_reg->pr_reg_all_tg_pt) {
3989                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
3990
3991                         put_unaligned_be16(sep_rtpi, &buf[off]);
3992                         off += 2;
3993                 } else
3994                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
3995
3996                 buf[off+4] = se_tpg->proto_id;
3997
3998                 /*
3999                  * Now, have the $FABRIC_MOD fill in the transport ID.
4000                  */
4001                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4002                                 &format_code, &buf[off+4]);
4003
4004                 spin_lock(&pr_tmpl->registration_lock);
4005                 atomic_dec_mb(&pr_reg->pr_res_holders);
4006
4007                 if (desc_len < 0)
4008                         break;
4009                 /*
4010                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4011                  */
4012                 put_unaligned_be32(desc_len, &buf[off]);
4013                 /*
4014                  * Size of full desctipor header minus TransportID
4015                  * containing $FABRIC_MOD specific) initiator device/port
4016                  * WWN information.
4017                  *
4018                  *  See spc4r17 Section 6.13.5 Table 169
4019                  */
4020                 add_desc_len = (24 + desc_len);
4021
4022                 off += desc_len;
4023                 add_len += add_desc_len;
4024         }
4025         spin_unlock(&pr_tmpl->registration_lock);
4026         /*
4027          * Set ADDITIONAL_LENGTH
4028          */
4029         put_unaligned_be32(add_len, &buf[4]);
4030
4031         transport_kunmap_data_sg(cmd);
4032
4033         return 0;
4034 }
4035
4036 sense_reason_t
4037 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4038 {
4039         sense_reason_t ret;
4040
4041         /*
4042          * Following spc2r20 5.5.1 Reservations overview:
4043          *
4044          * If a logical unit has been reserved by any RESERVE command and is
4045          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4046          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4047          * initiator or service action and shall terminate with a RESERVATION
4048          * CONFLICT status.
4049          */
4050         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4051                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4052                         " SPC-2 reservation is held, returning"
4053                         " RESERVATION_CONFLICT\n");
4054                 return TCM_RESERVATION_CONFLICT;
4055         }
4056
4057         switch (cmd->t_task_cdb[1] & 0x1f) {
4058         case PRI_READ_KEYS:
4059                 ret = core_scsi3_pri_read_keys(cmd);
4060                 break;
4061         case PRI_READ_RESERVATION:
4062                 ret = core_scsi3_pri_read_reservation(cmd);
4063                 break;
4064         case PRI_REPORT_CAPABILITIES:
4065                 ret = core_scsi3_pri_report_capabilities(cmd);
4066                 break;
4067         case PRI_READ_FULL_STATUS:
4068                 ret = core_scsi3_pri_read_full_status(cmd);
4069                 break;
4070         default:
4071                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4072                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4073                 return TCM_INVALID_CDB_FIELD;
4074         }
4075
4076         if (!ret)
4077                 target_complete_cmd(cmd, GOOD);
4078         return ret;
4079 }
4080
4081 sense_reason_t
4082 target_check_reservation(struct se_cmd *cmd)
4083 {
4084         struct se_device *dev = cmd->se_dev;
4085         sense_reason_t ret;
4086
4087         if (!cmd->se_sess)
4088                 return 0;
4089         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4090                 return 0;
4091         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
4092                 return 0;
4093
4094         spin_lock(&dev->dev_reservation_lock);
4095         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4096                 ret = target_scsi2_reservation_check(cmd);
4097         else
4098                 ret = target_scsi3_pr_reservation_check(cmd);
4099         spin_unlock(&dev->dev_reservation_lock);
4100
4101         return ret;
4102 }