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  * Copyright (c) 2009, 2010 Rising Tide Systems
   8  * Copyright (c) 2009, 2010 Linux-iSCSI.org
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  *
  26  ******************************************************************************/
  27
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/list.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_device.h>
  37 #include <target/target_core_tmr.h>
  38 #include <target/target_core_tpg.h>
  39 #include <target/target_core_transport.h>
  40 #include <target/target_core_fabric_ops.h>
  41 #include <target/target_core_configfs.h>
  42
  43 #include "target_core_hba.h"
  44 #include "target_core_pr.h"
  45 #include "target_core_ua.h"
  46
  47 /*
  48  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  49  */
  50 struct pr_transport_id_holder {
  51         int dest_local_nexus;
  52         struct t10_pr_registration *dest_pr_reg;
  53         struct se_portal_group *dest_tpg;
  54         struct se_node_acl *dest_node_acl;
  55         struct se_dev_entry *dest_se_deve;
  56         struct list_head dest_list;
  57 };
  58
  59 int core_pr_dump_initiator_port(
  60         struct t10_pr_registration *pr_reg,
  61         char *buf,
  62         u32 size)
  63 {
  64         if (!pr_reg->isid_present_at_reg)
  65                 return 0;
  66
  67         snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
  68         return 1;
  69 }
  70
  71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  72                         struct t10_pr_registration *, int);
  73
  74 static int core_scsi2_reservation_seq_non_holder(
  75         struct se_cmd *cmd,
  76         unsigned char *cdb,
  77         u32 pr_reg_type)
  78 {
  79         switch (cdb[0]) {
  80         case INQUIRY:
  81         case RELEASE:
  82         case RELEASE_10:
  83                 return 0;
  84         default:
  85                 return 1;
  86         }
  87
  88         return 1;
  89 }
  90
  91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
  92 {
  93         struct se_device *dev = cmd->se_dev;
  94         struct se_session *sess = cmd->se_sess;
  95         int ret;
  96
  97         if (!sess)
  98                 return 0;
  99
 100         spin_lock(&dev->dev_reservation_lock);
 101         if (!dev->dev_reserved_node_acl || !sess) {
 102                 spin_unlock(&dev->dev_reservation_lock);
 103                 return 0;
 104         }
 105         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 106                 spin_unlock(&dev->dev_reservation_lock);
 107                 return -EINVAL;
 108         }
 109         if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
 110                 spin_unlock(&dev->dev_reservation_lock);
 111                 return 0;
 112         }
 113         ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
 114         spin_unlock(&dev->dev_reservation_lock);
 115
 116         return ret;
 117 }
 118
 119 static int core_scsi2_reservation_release(struct se_cmd *cmd)
 120 {
 121         struct se_device *dev = cmd->se_dev;
 122         struct se_session *sess = cmd->se_sess;
 123         struct se_portal_group *tpg = sess->se_tpg;
 124
 125         if (!sess || !tpg)
 126                 return 0;
 127
 128         spin_lock(&dev->dev_reservation_lock);
 129         if (!dev->dev_reserved_node_acl || !sess) {
 130                 spin_unlock(&dev->dev_reservation_lock);
 131                 return 0;
 132         }
 133
 134         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 135                 spin_unlock(&dev->dev_reservation_lock);
 136                 return 0;
 137         }
 138         dev->dev_reserved_node_acl = NULL;
 139         dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 140         if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
 141                 dev->dev_res_bin_isid = 0;
 142                 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
 143         }
 144         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 145                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 146                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 147                 sess->se_node_acl->initiatorname);
 148         spin_unlock(&dev->dev_reservation_lock);
 149
 150         return 0;
 151 }
 152
 153 static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
 154 {
 155         struct se_device *dev = cmd->se_dev;
 156         struct se_session *sess = cmd->se_sess;
 157         struct se_portal_group *tpg = sess->se_tpg;
 158
 159         if ((cmd->t_task_cdb[1] & 0x01) &&
 160             (cmd->t_task_cdb[1] & 0x02)) {
 161                 pr_err("LongIO and Obselete Bits set, returning"
 162                                 " ILLEGAL_REQUEST\n");
 163                 return PYX_TRANSPORT_ILLEGAL_REQUEST;
 164         }
 165         /*
 166          * This is currently the case for target_core_mod passthrough struct se_cmd
 167          * ops
 168          */
 169         if (!sess || !tpg)
 170                 return 0;
 171
 172         spin_lock(&dev->dev_reservation_lock);
 173         if (dev->dev_reserved_node_acl &&
 174            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 175                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 176                         tpg->se_tpg_tfo->get_fabric_name());
 177                 pr_err("Original reserver LUN: %u %s\n",
 178                         cmd->se_lun->unpacked_lun,
 179                         dev->dev_reserved_node_acl->initiatorname);
 180                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 181                         " from %s \n", cmd->se_lun->unpacked_lun,
 182                         cmd->se_deve->mapped_lun,
 183                         sess->se_node_acl->initiatorname);
 184                 spin_unlock(&dev->dev_reservation_lock);
 185                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
 186         }
 187
 188         dev->dev_reserved_node_acl = sess->se_node_acl;
 189         dev->dev_flags |= DF_SPC2_RESERVATIONS;
 190         if (sess->sess_bin_isid != 0) {
 191                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 192                 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
 193         }
 194         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 195                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 196                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 197                 sess->se_node_acl->initiatorname);
 198         spin_unlock(&dev->dev_reservation_lock);
 199
 200         return 0;
 201 }
 202
 203 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 204                                         struct se_node_acl *, struct se_session *);
 205 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 206
 207 /*
 208  * Setup in target_core_transport.c:transport_generic_cmd_sequencer()
 209  * and called via struct se_cmd->transport_emulate_cdb() in TCM processing
 210  * thread context.
 211  */
 212 int core_scsi2_emulate_crh(struct se_cmd *cmd)
 213 {
 214         struct se_session *se_sess = cmd->se_sess;
 215         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 216         struct t10_pr_registration *pr_reg;
 217         struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
 218         unsigned char *cdb = &cmd->t_task_cdb[0];
 219         int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
 220         int conflict = 0;
 221
 222         if (!se_sess)
 223                 return 0;
 224
 225         if (!crh)
 226                 goto after_crh;
 227
 228         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 229                         se_sess);
 230         if (pr_reg) {
 231                 /*
 232                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 233                  * behavior
 234                  *
 235                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 236                  * status, but no reservation shall be established and the
 237                  * persistent reservation shall not be changed, if the command
 238                  * is received from a) and b) below.
 239                  *
 240                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 241                  * status, but the persistent reservation shall not be released,
 242                  * if the command is received from a) and b)
 243                  *
 244                  * a) An I_T nexus that is a persistent reservation holder; or
 245                  * b) An I_T nexus that is registered if a registrants only or
 246                  *    all registrants type persistent reservation is present.
 247                  *
 248                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 249                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 250                  * as defined in SPC-2.
 251                  */
 252                 if (pr_reg->pr_res_holder) {
 253                         core_scsi3_put_pr_reg(pr_reg);
 254                         return 0;
 255                 }
 256                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 257                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 258                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 259                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 260                         core_scsi3_put_pr_reg(pr_reg);
 261                         return 0;
 262                 }
 263                 core_scsi3_put_pr_reg(pr_reg);
 264                 conflict = 1;
 265         } else {
 266                 /*
 267                  * Following spc2r20 5.5.1 Reservations overview:
 268                  *
 269                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 270                  * command with the REGISTER or the REGISTER AND IGNORE
 271                  * EXISTING KEY service action and is still registered by any
 272                  * initiator, all RESERVE commands and all RELEASE commands
 273                  * regardless of initiator shall conflict and shall terminate
 274                  * with a RESERVATION CONFLICT status.
 275                  */
 276                 spin_lock(&pr_tmpl->registration_lock);
 277                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 278                 spin_unlock(&pr_tmpl->registration_lock);
 279         }
 280
 281         if (conflict) {
 282                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 283                         " while active SPC-3 registrations exist,"
 284                         " returning RESERVATION_CONFLICT\n");
 285                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
 286         }
 287
 288 after_crh:
 289         if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10))
 290                 return core_scsi2_reservation_reserve(cmd);
 291         else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10))
 292                 return core_scsi2_reservation_release(cmd);
 293         else
 294                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
 295 }
 296
 297 /*
 298  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 299  *
 300  * This function is called by those initiator ports who are *NOT*
 301  * the active PR reservation holder when a reservation is present.
 302  */
 303 static int core_scsi3_pr_seq_non_holder(
 304         struct se_cmd *cmd,
 305         unsigned char *cdb,
 306         u32 pr_reg_type)
 307 {
 308         struct se_dev_entry *se_deve;
 309         struct se_session *se_sess = cmd->se_sess;
 310         int other_cdb = 0, ignore_reg;
 311         int registered_nexus = 0, ret = 1; /* Conflict by default */
 312         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 313         int we = 0; /* Write Exclusive */
 314         int legacy = 0; /* Act like a legacy device and return
 315                          * RESERVATION CONFLICT on some CDBs */
 316         /*
 317          * A legacy SPC-2 reservation is being held.
 318          */
 319         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
 320                 return core_scsi2_reservation_seq_non_holder(cmd,
 321                                         cdb, pr_reg_type);
 322
 323         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 324         /*
 325          * Determine if the registration should be ignored due to
 326          * non-matching ISIDs in core_scsi3_pr_reservation_check().
 327          */
 328         ignore_reg = (pr_reg_type & 0x80000000);
 329         if (ignore_reg)
 330                 pr_reg_type &= ~0x80000000;
 331
 332         switch (pr_reg_type) {
 333         case PR_TYPE_WRITE_EXCLUSIVE:
 334                 we = 1;
 335         case PR_TYPE_EXCLUSIVE_ACCESS:
 336                 /*
 337                  * Some commands are only allowed for the persistent reservation
 338                  * holder.
 339                  */
 340                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 341                         registered_nexus = 1;
 342                 break;
 343         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 344                 we = 1;
 345         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 346                 /*
 347                  * Some commands are only allowed for registered I_T Nexuses.
 348                  */
 349                 reg_only = 1;
 350                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 351                         registered_nexus = 1;
 352                 break;
 353         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 354                 we = 1;
 355         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 356                 /*
 357                  * Each registered I_T Nexus is a reservation holder.
 358                  */
 359                 all_reg = 1;
 360                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 361                         registered_nexus = 1;
 362                 break;
 363         default:
 364                 return -EINVAL;
 365         }
 366         /*
 367          * Referenced from spc4r17 table 45 for *NON* PR holder access
 368          */
 369         switch (cdb[0]) {
 370         case SECURITY_PROTOCOL_IN:
 371                 if (registered_nexus)
 372                         return 0;
 373                 ret = (we) ? 0 : 1;
 374                 break;
 375         case MODE_SENSE:
 376         case MODE_SENSE_10:
 377         case READ_ATTRIBUTE:
 378         case READ_BUFFER:
 379         case RECEIVE_DIAGNOSTIC:
 380                 if (legacy) {
 381                         ret = 1;
 382                         break;
 383                 }
 384                 if (registered_nexus) {
 385                         ret = 0;
 386                         break;
 387                 }
 388                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 389                 break;
 390         case PERSISTENT_RESERVE_OUT:
 391                 /*
 392                  * This follows PERSISTENT_RESERVE_OUT service actions that
 393                  * are allowed in the presence of various reservations.
 394                  * See spc4r17, table 46
 395                  */
 396                 switch (cdb[1] & 0x1f) {
 397                 case PRO_CLEAR:
 398                 case PRO_PREEMPT:
 399                 case PRO_PREEMPT_AND_ABORT:
 400                         ret = (registered_nexus) ? 0 : 1;
 401                         break;
 402                 case PRO_REGISTER:
 403                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 404                         ret = 0;
 405                         break;
 406                 case PRO_REGISTER_AND_MOVE:
 407                 case PRO_RESERVE:
 408                         ret = 1;
 409                         break;
 410                 case PRO_RELEASE:
 411                         ret = (registered_nexus) ? 0 : 1;
 412                         break;
 413                 default:
 414                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 415                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 416                         return -EINVAL;
 417                 }
 418                 break;
 419         case RELEASE:
 420         case RELEASE_10:
 421                 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
 422                 ret = 0;
 423                 break;
 424         case RESERVE:
 425         case RESERVE_10:
 426                 /* Handled by CRH=1 in core_scsi2_emulate_crh() */
 427                 ret = 0;
 428                 break;
 429         case TEST_UNIT_READY:
 430                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 431                 break;
 432         case MAINTENANCE_IN:
 433                 switch (cdb[1] & 0x1f) {
 434                 case MI_MANAGEMENT_PROTOCOL_IN:
 435                         if (registered_nexus) {
 436                                 ret = 0;
 437                                 break;
 438                         }
 439                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 440                         break;
 441                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 442                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 443                         if (legacy) {
 444                                 ret = 1;
 445                                 break;
 446                         }
 447                         if (registered_nexus) {
 448                                 ret = 0;
 449                                 break;
 450                         }
 451                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 452                         break;
 453                 case MI_REPORT_ALIASES:
 454                 case MI_REPORT_IDENTIFYING_INFORMATION:
 455                 case MI_REPORT_PRIORITY:
 456                 case MI_REPORT_TARGET_PGS:
 457                 case MI_REPORT_TIMESTAMP:
 458                         ret = 0; /* Allowed */
 459                         break;
 460                 default:
 461                         pr_err("Unknown MI Service Action: 0x%02x\n",
 462                                 (cdb[1] & 0x1f));
 463                         return -EINVAL;
 464                 }
 465                 break;
 466         case ACCESS_CONTROL_IN:
 467         case ACCESS_CONTROL_OUT:
 468         case INQUIRY:
 469         case LOG_SENSE:
 470         case READ_MEDIA_SERIAL_NUMBER:
 471         case REPORT_LUNS:
 472         case REQUEST_SENSE:
 473                 ret = 0; /*/ Allowed CDBs */
 474                 break;
 475         default:
 476                 other_cdb = 1;
 477                 break;
 478         }
 479         /*
 480          * Case where the CDB is explicitly allowed in the above switch
 481          * statement.
 482          */
 483         if (!ret && !other_cdb) {
 484 #if 0
 485                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 486                         " reservation holder\n", cdb[0],
 487                         core_scsi3_pr_dump_type(pr_reg_type));
 488 #endif
 489                 return ret;
 490         }
 491         /*
 492          * Check if write exclusive initiator ports *NOT* holding the
 493          * WRITE_EXCLUSIVE_* reservation.
 494          */
 495         if ((we) && !(registered_nexus)) {
 496                 if (cmd->data_direction == DMA_TO_DEVICE) {
 497                         /*
 498                          * Conflict for write exclusive
 499                          */
 500                         pr_debug("%s Conflict for unregistered nexus"
 501                                 " %s CDB: 0x%02x to %s reservation\n",
 502                                 transport_dump_cmd_direction(cmd),
 503                                 se_sess->se_node_acl->initiatorname, cdb[0],
 504                                 core_scsi3_pr_dump_type(pr_reg_type));
 505                         return 1;
 506                 } else {
 507                         /*
 508                          * Allow non WRITE CDBs for all Write Exclusive
 509                          * PR TYPEs to pass for registered and
 510                          * non-registered_nexuxes NOT holding the reservation.
 511                          *
 512                          * We only make noise for the unregisterd nexuses,
 513                          * as we expect registered non-reservation holding
 514                          * nexuses to issue CDBs.
 515                          */
 516 #if 0
 517                         if (!registered_nexus) {
 518                                 pr_debug("Allowing implict CDB: 0x%02x"
 519                                         " for %s reservation on unregistered"
 520                                         " nexus\n", cdb[0],
 521                                         core_scsi3_pr_dump_type(pr_reg_type));
 522                         }
 523 #endif
 524                         return 0;
 525                 }
 526         } else if ((reg_only) || (all_reg)) {
 527                 if (registered_nexus) {
 528                         /*
 529                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 530                          * allow commands from registered nexuses.
 531                          */
 532 #if 0
 533                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 534                                 " reservation\n", cdb[0],
 535                                 core_scsi3_pr_dump_type(pr_reg_type));
 536 #endif
 537                         return 0;
 538                 }
 539         }
 540         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 541                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 542                 (registered_nexus) ? "" : "un",
 543                 se_sess->se_node_acl->initiatorname, cdb[0],
 544                 core_scsi3_pr_dump_type(pr_reg_type));
 545
 546         return 1; /* Conflict by default */
 547 }
 548
 549 static u32 core_scsi3_pr_generation(struct se_device *dev)
 550 {
 551         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 552         u32 prg;
 553         /*
 554          * PRGeneration field shall contain the value of a 32-bit wrapping
 555          * counter mainted by the device server.
 556          *
 557          * Note that this is done regardless of Active Persist across
 558          * Target PowerLoss (APTPL)
 559          *
 560          * See spc4r17 section 6.3.12 READ_KEYS service action
 561          */
 562         spin_lock(&dev->dev_reservation_lock);
 563         prg = su_dev->t10_pr.pr_generation++;
 564         spin_unlock(&dev->dev_reservation_lock);
 565
 566         return prg;
 567 }
 568
 569 static int core_scsi3_pr_reservation_check(
 570         struct se_cmd *cmd,
 571         u32 *pr_reg_type)
 572 {
 573         struct se_device *dev = cmd->se_dev;
 574         struct se_session *sess = cmd->se_sess;
 575         int ret;
 576
 577         if (!sess)
 578                 return 0;
 579         /*
 580          * A legacy SPC-2 reservation is being held.
 581          */
 582         if (dev->dev_flags & DF_SPC2_RESERVATIONS)
 583                 return core_scsi2_reservation_check(cmd, pr_reg_type);
 584
 585         spin_lock(&dev->dev_reservation_lock);
 586         if (!dev->dev_pr_res_holder) {
 587                 spin_unlock(&dev->dev_reservation_lock);
 588                 return 0;
 589         }
 590         *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 591         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 592         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
 593                 spin_unlock(&dev->dev_reservation_lock);
 594                 return -EINVAL;
 595         }
 596         if (!dev->dev_pr_res_holder->isid_present_at_reg) {
 597                 spin_unlock(&dev->dev_reservation_lock);
 598                 return 0;
 599         }
 600         ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
 601                sess->sess_bin_isid) ? 0 : -EINVAL;
 602         /*
 603          * Use bit in *pr_reg_type to notify ISID mismatch in
 604          * core_scsi3_pr_seq_non_holder().
 605          */
 606         if (ret != 0)
 607                 *pr_reg_type |= 0x80000000;
 608         spin_unlock(&dev->dev_reservation_lock);
 609
 610         return ret;
 611 }
 612
 613 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 614         struct se_device *dev,
 615         struct se_node_acl *nacl,
 616         struct se_dev_entry *deve,
 617         unsigned char *isid,
 618         u64 sa_res_key,
 619         int all_tg_pt,
 620         int aptpl)
 621 {
 622         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 623         struct t10_pr_registration *pr_reg;
 624
 625         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 626         if (!pr_reg) {
 627                 pr_err("Unable to allocate struct t10_pr_registration\n");
 628                 return NULL;
 629         }
 630
 631         pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
 632                                         GFP_ATOMIC);
 633         if (!pr_reg->pr_aptpl_buf) {
 634                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 635                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 636                 return NULL;
 637         }
 638
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 640         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 641         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 642         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 643         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 644         atomic_set(&pr_reg->pr_res_holders, 0);
 645         pr_reg->pr_reg_nacl = nacl;
 646         pr_reg->pr_reg_deve = deve;
 647         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 648         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 649         pr_reg->pr_res_key = sa_res_key;
 650         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 651         pr_reg->pr_reg_aptpl = aptpl;
 652         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 653         /*
 654          * If an ISID value for this SCSI Initiator Port exists,
 655          * save it to the registration now.
 656          */
 657         if (isid != NULL) {
 658                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 659                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 660                 pr_reg->isid_present_at_reg = 1;
 661         }
 662
 663         return pr_reg;
 664 }
 665
 666 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 667 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 668
 669 /*
 670  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 671  * modes.
 672  */
 673 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 674         struct se_device *dev,
 675         struct se_node_acl *nacl,
 676         struct se_dev_entry *deve,
 677         unsigned char *isid,
 678         u64 sa_res_key,
 679         int all_tg_pt,
 680         int aptpl)
 681 {
 682         struct se_dev_entry *deve_tmp;
 683         struct se_node_acl *nacl_tmp;
 684         struct se_port *port, *port_tmp;
 685         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 686         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 687         int ret;
 688         /*
 689          * Create a registration for the I_T Nexus upon which the
 690          * PROUT REGISTER was received.
 691          */
 692         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 693                         sa_res_key, all_tg_pt, aptpl);
 694         if (!pr_reg)
 695                 return NULL;
 696         /*
 697          * Return pointer to pr_reg for ALL_TG_PT=0
 698          */
 699         if (!all_tg_pt)
 700                 return pr_reg;
 701         /*
 702          * Create list of matching SCSI Initiator Port registrations
 703          * for ALL_TG_PT=1
 704          */
 705         spin_lock(&dev->se_port_lock);
 706         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 707                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 708                 smp_mb__after_atomic_inc();
 709                 spin_unlock(&dev->se_port_lock);
 710
 711                 spin_lock_bh(&port->sep_alua_lock);
 712                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 713                                         alua_port_list) {
 714                         /*
 715                          * This pointer will be NULL for demo mode MappedLUNs
 716                          * that have not been make explict via a ConfigFS
 717                          * MappedLUN group for the SCSI Initiator Node ACL.
 718                          */
 719                         if (!deve_tmp->se_lun_acl)
 720                                 continue;
 721
 722                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 723                         /*
 724                          * Skip the matching struct se_node_acl that is allocated
 725                          * above..
 726                          */
 727                         if (nacl == nacl_tmp)
 728                                 continue;
 729                         /*
 730                          * Only perform PR registrations for target ports on
 731                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 732                          * arrived.
 733                          */
 734                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 735                                 continue;
 736                         /*
 737                          * Look for a matching Initiator Node ACL in ASCII format
 738                          */
 739                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 740                                 continue;
 741
 742                         atomic_inc(&deve_tmp->pr_ref_count);
 743                         smp_mb__after_atomic_inc();
 744                         spin_unlock_bh(&port->sep_alua_lock);
 745                         /*
 746                          * Grab a configfs group dependency that is released
 747                          * for the exception path at label out: below, or upon
 748                          * completion of adding ALL_TG_PT=1 registrations in
 749                          * __core_scsi3_add_registration()
 750                          */
 751                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 752                         if (ret < 0) {
 753                                 pr_err("core_scsi3_lunacl_depend"
 754                                                 "_item() failed\n");
 755                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 756                                 smp_mb__after_atomic_dec();
 757                                 atomic_dec(&deve_tmp->pr_ref_count);
 758                                 smp_mb__after_atomic_dec();
 759                                 goto out;
 760                         }
 761                         /*
 762                          * Located a matching SCSI Initiator Port on a different
 763                          * port, allocate the pr_reg_atp and attach it to the
 764                          * pr_reg->pr_reg_atp_list that will be processed once
 765                          * the original *pr_reg is processed in
 766                          * __core_scsi3_add_registration()
 767                          */
 768                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 769                                                 nacl_tmp, deve_tmp, NULL,
 770                                                 sa_res_key, all_tg_pt, aptpl);
 771                         if (!pr_reg_atp) {
 772                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 773                                 smp_mb__after_atomic_dec();
 774                                 atomic_dec(&deve_tmp->pr_ref_count);
 775                                 smp_mb__after_atomic_dec();
 776                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 777                                 goto out;
 778                         }
 779
 780                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 781                                       &pr_reg->pr_reg_atp_list);
 782                         spin_lock_bh(&port->sep_alua_lock);
 783                 }
 784                 spin_unlock_bh(&port->sep_alua_lock);
 785
 786                 spin_lock(&dev->se_port_lock);
 787                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 788                 smp_mb__after_atomic_dec();
 789         }
 790         spin_unlock(&dev->se_port_lock);
 791
 792         return pr_reg;
 793 out:
 794         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 795                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 796                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 797                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 798                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 799         }
 800         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 801         return NULL;
 802 }
 803
 804 int core_scsi3_alloc_aptpl_registration(
 805         struct t10_reservation *pr_tmpl,
 806         u64 sa_res_key,
 807         unsigned char *i_port,
 808         unsigned char *isid,
 809         u32 mapped_lun,
 810         unsigned char *t_port,
 811         u16 tpgt,
 812         u32 target_lun,
 813         int res_holder,
 814         int all_tg_pt,
 815         u8 type)
 816 {
 817         struct t10_pr_registration *pr_reg;
 818
 819         if (!i_port || !t_port || !sa_res_key) {
 820                 pr_err("Illegal parameters for APTPL registration\n");
 821                 return -EINVAL;
 822         }
 823
 824         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 825         if (!pr_reg) {
 826                 pr_err("Unable to allocate struct t10_pr_registration\n");
 827                 return -ENOMEM;
 828         }
 829         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 830
 831         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 832         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 833         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 834         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 835         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 836         atomic_set(&pr_reg->pr_res_holders, 0);
 837         pr_reg->pr_reg_nacl = NULL;
 838         pr_reg->pr_reg_deve = NULL;
 839         pr_reg->pr_res_mapped_lun = mapped_lun;
 840         pr_reg->pr_aptpl_target_lun = target_lun;
 841         pr_reg->pr_res_key = sa_res_key;
 842         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 843         pr_reg->pr_reg_aptpl = 1;
 844         pr_reg->pr_reg_tg_pt_lun = NULL;
 845         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 846         pr_reg->pr_res_type = type;
 847         /*
 848          * If an ISID value had been saved in APTPL metadata for this
 849          * SCSI Initiator Port, restore it now.
 850          */
 851         if (isid != NULL) {
 852                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 853                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 854                 pr_reg->isid_present_at_reg = 1;
 855         }
 856         /*
 857          * Copy the i_port and t_port information from caller.
 858          */
 859         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 860         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 861         pr_reg->pr_reg_tpgt = tpgt;
 862         /*
 863          * Set pr_res_holder from caller, the pr_reg who is the reservation
 864          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 865          * the Initiator Node LUN ACL from the fabric module is created for
 866          * this registration.
 867          */
 868         pr_reg->pr_res_holder = res_holder;
 869
 870         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 871         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 872                         " metadata\n", (res_holder) ? "+reservation" : "");
 873         return 0;
 874 }
 875
 876 static void core_scsi3_aptpl_reserve(
 877         struct se_device *dev,
 878         struct se_portal_group *tpg,
 879         struct se_node_acl *node_acl,
 880         struct t10_pr_registration *pr_reg)
 881 {
 882         char i_buf[PR_REG_ISID_ID_LEN];
 883         int prf_isid;
 884
 885         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 886         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 887                                 PR_REG_ISID_ID_LEN);
 888
 889         spin_lock(&dev->dev_reservation_lock);
 890         dev->dev_pr_res_holder = pr_reg;
 891         spin_unlock(&dev->dev_reservation_lock);
 892
 893         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 894                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 895                 tpg->se_tpg_tfo->get_fabric_name(),
 896                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 897                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 898         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 899                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 900                 (prf_isid) ? &i_buf[0] : "");
 901 }
 902
 903 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 904                                 struct t10_pr_registration *, int, int);
 905
 906 static int __core_scsi3_check_aptpl_registration(
 907         struct se_device *dev,
 908         struct se_portal_group *tpg,
 909         struct se_lun *lun,
 910         u32 target_lun,
 911         struct se_node_acl *nacl,
 912         struct se_dev_entry *deve)
 913 {
 914         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 915         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
 916         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 917         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 918         u16 tpgt;
 919
 920         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 921         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 922         /*
 923          * Copy Initiator Port information from struct se_node_acl
 924          */
 925         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 926         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 927                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 928         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 929         /*
 930          * Look for the matching registrations+reservation from those
 931          * created from APTPL metadata.  Note that multiple registrations
 932          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 933          * TransportIDs.
 934          */
 935         spin_lock(&pr_tmpl->aptpl_reg_lock);
 936         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 937                                 pr_reg_aptpl_list) {
 938                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 939                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 940                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 941                      (pr_reg->pr_reg_tpgt == tpgt) &&
 942                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 943
 944                         pr_reg->pr_reg_nacl = nacl;
 945                         pr_reg->pr_reg_deve = deve;
 946                         pr_reg->pr_reg_tg_pt_lun = lun;
 947
 948                         list_del(&pr_reg->pr_reg_aptpl_list);
 949                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 950                         /*
 951                          * At this point all of the pointers in *pr_reg will
 952                          * be setup, so go ahead and add the registration.
 953                          */
 954
 955                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 956                         /*
 957                          * If this registration is the reservation holder,
 958                          * make that happen now..
 959                          */
 960                         if (pr_reg->pr_res_holder)
 961                                 core_scsi3_aptpl_reserve(dev, tpg,
 962                                                 nacl, pr_reg);
 963                         /*
 964                          * Reenable pr_aptpl_active to accept new metadata
 965                          * updates once the SCSI device is active again..
 966                          */
 967                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 968                         pr_tmpl->pr_aptpl_active = 1;
 969                 }
 970         }
 971         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 972
 973         return 0;
 974 }
 975
 976 int core_scsi3_check_aptpl_registration(
 977         struct se_device *dev,
 978         struct se_portal_group *tpg,
 979         struct se_lun *lun,
 980         struct se_lun_acl *lun_acl)
 981 {
 982         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 983         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 984         struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
 985
 986         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
 987                 return 0;
 988
 989         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 990                                 lun->unpacked_lun, nacl, deve);
 991 }
 992
 993 static void __core_scsi3_dump_registration(
 994         struct target_core_fabric_ops *tfo,
 995         struct se_device *dev,
 996         struct se_node_acl *nacl,
 997         struct t10_pr_registration *pr_reg,
 998         int register_type)
 999 {
1000         struct se_portal_group *se_tpg = nacl->se_tpg;
1001         char i_buf[PR_REG_ISID_ID_LEN];
1002         int prf_isid;
1003
1004         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1005         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1006                                 PR_REG_ISID_ID_LEN);
1007
1008         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1009                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1010                 "_AND_MOVE" : (register_type == 1) ?
1011                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1012                 (prf_isid) ? i_buf : "");
1013         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1014                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1015                 tfo->tpg_get_tag(se_tpg));
1016         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1017                 " Port(s)\n",  tfo->get_fabric_name(),
1018                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1019                 dev->transport->name);
1020         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1021                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1022                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1023                 pr_reg->pr_reg_aptpl);
1024 }
1025
1026 /*
1027  * this function can be called with struct se_device->dev_reservation_lock
1028  * when register_move = 1
1029  */
1030 static void __core_scsi3_add_registration(
1031         struct se_device *dev,
1032         struct se_node_acl *nacl,
1033         struct t10_pr_registration *pr_reg,
1034         int register_type,
1035         int register_move)
1036 {
1037         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1038         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1039         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1040         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1041
1042         /*
1043          * Increment PRgeneration counter for struct se_device upon a successful
1044          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1045          *
1046          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1047          * action, the struct se_device->dev_reservation_lock will already be held,
1048          * so we do not call core_scsi3_pr_generation() which grabs the lock
1049          * for the REGISTER.
1050          */
1051         pr_reg->pr_res_generation = (register_move) ?
1052                         su_dev->t10_pr.pr_generation++ :
1053                         core_scsi3_pr_generation(dev);
1054
1055         spin_lock(&pr_tmpl->registration_lock);
1056         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1057         pr_reg->pr_reg_deve->def_pr_registered = 1;
1058
1059         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1060         spin_unlock(&pr_tmpl->registration_lock);
1061         /*
1062          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1063          */
1064         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1065                 return;
1066         /*
1067          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1068          * allocated in __core_scsi3_alloc_registration()
1069          */
1070         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1071                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1072                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1073
1074                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1075
1076                 spin_lock(&pr_tmpl->registration_lock);
1077                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1078                               &pr_tmpl->registration_list);
1079                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1080
1081                 __core_scsi3_dump_registration(tfo, dev,
1082                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1083                                 register_type);
1084                 spin_unlock(&pr_tmpl->registration_lock);
1085                 /*
1086                  * Drop configfs group dependency reference from
1087                  * __core_scsi3_alloc_registration()
1088                  */
1089                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1090         }
1091 }
1092
1093 static int core_scsi3_alloc_registration(
1094         struct se_device *dev,
1095         struct se_node_acl *nacl,
1096         struct se_dev_entry *deve,
1097         unsigned char *isid,
1098         u64 sa_res_key,
1099         int all_tg_pt,
1100         int aptpl,
1101         int register_type,
1102         int register_move)
1103 {
1104         struct t10_pr_registration *pr_reg;
1105
1106         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1107                         sa_res_key, all_tg_pt, aptpl);
1108         if (!pr_reg)
1109                 return -EPERM;
1110
1111         __core_scsi3_add_registration(dev, nacl, pr_reg,
1112                         register_type, register_move);
1113         return 0;
1114 }
1115
1116 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1117         struct se_device *dev,
1118         struct se_node_acl *nacl,
1119         unsigned char *isid)
1120 {
1121         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1122         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1123         struct se_portal_group *tpg;
1124
1125         spin_lock(&pr_tmpl->registration_lock);
1126         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1127                         &pr_tmpl->registration_list, pr_reg_list) {
1128                 /*
1129                  * First look for a matching struct se_node_acl
1130                  */
1131                 if (pr_reg->pr_reg_nacl != nacl)
1132                         continue;
1133
1134                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1135                 /*
1136                  * If this registration does NOT contain a fabric provided
1137                  * ISID, then we have found a match.
1138                  */
1139                 if (!pr_reg->isid_present_at_reg) {
1140                         /*
1141                          * Determine if this SCSI device server requires that
1142                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1143                          * for fabric modules (iSCSI) requiring them.
1144                          */
1145                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1146                                 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1147                                         continue;
1148                         }
1149                         atomic_inc(&pr_reg->pr_res_holders);
1150                         smp_mb__after_atomic_inc();
1151                         spin_unlock(&pr_tmpl->registration_lock);
1152                         return pr_reg;
1153                 }
1154                 /*
1155                  * If the *pr_reg contains a fabric defined ISID for multi-value
1156                  * SCSI Initiator Port TransportIDs, then we expect a valid
1157                  * matching ISID to be provided by the local SCSI Initiator Port.
1158                  */
1159                 if (!isid)
1160                         continue;
1161                 if (strcmp(isid, pr_reg->pr_reg_isid))
1162                         continue;
1163
1164                 atomic_inc(&pr_reg->pr_res_holders);
1165                 smp_mb__after_atomic_inc();
1166                 spin_unlock(&pr_tmpl->registration_lock);
1167                 return pr_reg;
1168         }
1169         spin_unlock(&pr_tmpl->registration_lock);
1170
1171         return NULL;
1172 }
1173
1174 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1175         struct se_device *dev,
1176         struct se_node_acl *nacl,
1177         struct se_session *sess)
1178 {
1179         struct se_portal_group *tpg = nacl->se_tpg;
1180         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1181
1182         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1183                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1184                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1185                                         PR_REG_ISID_LEN);
1186                 isid_ptr = &buf[0];
1187         }
1188
1189         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1190 }
1191
1192 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1193 {
1194         atomic_dec(&pr_reg->pr_res_holders);
1195         smp_mb__after_atomic_dec();
1196 }
1197
1198 static int core_scsi3_check_implict_release(
1199         struct se_device *dev,
1200         struct t10_pr_registration *pr_reg)
1201 {
1202         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1203         struct t10_pr_registration *pr_res_holder;
1204         int ret = 0;
1205
1206         spin_lock(&dev->dev_reservation_lock);
1207         pr_res_holder = dev->dev_pr_res_holder;
1208         if (!pr_res_holder) {
1209                 spin_unlock(&dev->dev_reservation_lock);
1210                 return ret;
1211         }
1212         if (pr_res_holder == pr_reg) {
1213                 /*
1214                  * Perform an implict RELEASE if the registration that
1215                  * is being released is holding the reservation.
1216                  *
1217                  * From spc4r17, section 5.7.11.1:
1218                  *
1219                  * e) If the I_T nexus is the persistent reservation holder
1220                  *    and the persistent reservation is not an all registrants
1221                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1222                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1223                  *    service action with the SERVICE ACTION RESERVATION KEY
1224                  *    field set to zero (see 5.7.11.3).
1225                  */
1226                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1227                 ret = 1;
1228                 /*
1229                  * For 'All Registrants' reservation types, all existing
1230                  * registrations are still processed as reservation holders
1231                  * in core_scsi3_pr_seq_non_holder() after the initial
1232                  * reservation holder is implictly released here.
1233                  */
1234         } else if (pr_reg->pr_reg_all_tg_pt &&
1235                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1236                           pr_reg->pr_reg_nacl->initiatorname)) &&
1237                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1238                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1239                         " UNREGISTER while existing reservation with matching"
1240                         " key 0x%016Lx is present from another SCSI Initiator"
1241                         " Port\n", pr_reg->pr_res_key);
1242                 ret = -EPERM;
1243         }
1244         spin_unlock(&dev->dev_reservation_lock);
1245
1246         return ret;
1247 }
1248
1249 /*
1250  * Called with struct t10_reservation->registration_lock held.
1251  */
1252 static void __core_scsi3_free_registration(
1253         struct se_device *dev,
1254         struct t10_pr_registration *pr_reg,
1255         struct list_head *preempt_and_abort_list,
1256         int dec_holders)
1257 {
1258         struct target_core_fabric_ops *tfo =
1259                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1260         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1261         char i_buf[PR_REG_ISID_ID_LEN];
1262         int prf_isid;
1263
1264         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1265         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1266                                 PR_REG_ISID_ID_LEN);
1267
1268         pr_reg->pr_reg_deve->def_pr_registered = 0;
1269         pr_reg->pr_reg_deve->pr_res_key = 0;
1270         list_del(&pr_reg->pr_reg_list);
1271         /*
1272          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1273          * so call core_scsi3_put_pr_reg() to decrement our reference.
1274          */
1275         if (dec_holders)
1276                 core_scsi3_put_pr_reg(pr_reg);
1277         /*
1278          * Wait until all reference from any other I_T nexuses for this
1279          * *pr_reg have been released.  Because list_del() is called above,
1280          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1281          * count back to zero, and we release *pr_reg.
1282          */
1283         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1284                 spin_unlock(&pr_tmpl->registration_lock);
1285                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1286                                 tfo->get_fabric_name());
1287                 cpu_relax();
1288                 spin_lock(&pr_tmpl->registration_lock);
1289         }
1290
1291         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1292                 " Node: %s%s\n", tfo->get_fabric_name(),
1293                 pr_reg->pr_reg_nacl->initiatorname,
1294                 (prf_isid) ? &i_buf[0] : "");
1295         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1296                 " Port(s)\n", tfo->get_fabric_name(),
1297                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1298                 dev->transport->name);
1299         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1300                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1301                 pr_reg->pr_res_generation);
1302
1303         if (!preempt_and_abort_list) {
1304                 pr_reg->pr_reg_deve = NULL;
1305                 pr_reg->pr_reg_nacl = NULL;
1306                 kfree(pr_reg->pr_aptpl_buf);
1307                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1308                 return;
1309         }
1310         /*
1311          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1312          * are released once the ABORT_TASK_SET has completed..
1313          */
1314         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1315 }
1316
1317 void core_scsi3_free_pr_reg_from_nacl(
1318         struct se_device *dev,
1319         struct se_node_acl *nacl)
1320 {
1321         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1322         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323         /*
1324          * If the passed se_node_acl matches the reservation holder,
1325          * release the reservation.
1326          */
1327         spin_lock(&dev->dev_reservation_lock);
1328         pr_res_holder = dev->dev_pr_res_holder;
1329         if ((pr_res_holder != NULL) &&
1330             (pr_res_holder->pr_reg_nacl == nacl))
1331                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1332         spin_unlock(&dev->dev_reservation_lock);
1333         /*
1334          * Release any registration associated with the struct se_node_acl.
1335          */
1336         spin_lock(&pr_tmpl->registration_lock);
1337         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1338                         &pr_tmpl->registration_list, pr_reg_list) {
1339
1340                 if (pr_reg->pr_reg_nacl != nacl)
1341                         continue;
1342
1343                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1344         }
1345         spin_unlock(&pr_tmpl->registration_lock);
1346 }
1347
1348 void core_scsi3_free_all_registrations(
1349         struct se_device *dev)
1350 {
1351         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1352         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1353
1354         spin_lock(&dev->dev_reservation_lock);
1355         pr_res_holder = dev->dev_pr_res_holder;
1356         if (pr_res_holder != NULL) {
1357                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1358                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1359                                 pr_res_holder, 0);
1360         }
1361         spin_unlock(&dev->dev_reservation_lock);
1362
1363         spin_lock(&pr_tmpl->registration_lock);
1364         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1365                         &pr_tmpl->registration_list, pr_reg_list) {
1366
1367                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1368         }
1369         spin_unlock(&pr_tmpl->registration_lock);
1370
1371         spin_lock(&pr_tmpl->aptpl_reg_lock);
1372         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1373                                 pr_reg_aptpl_list) {
1374                 list_del(&pr_reg->pr_reg_aptpl_list);
1375                 kfree(pr_reg->pr_aptpl_buf);
1376                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1377         }
1378         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1379 }
1380
1381 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1382 {
1383         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1384                         &tpg->tpg_group.cg_item);
1385 }
1386
1387 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1388 {
1389         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1390                         &tpg->tpg_group.cg_item);
1391
1392         atomic_dec(&tpg->tpg_pr_ref_count);
1393         smp_mb__after_atomic_dec();
1394 }
1395
1396 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1397 {
1398         struct se_portal_group *tpg = nacl->se_tpg;
1399
1400         if (nacl->dynamic_node_acl)
1401                 return 0;
1402
1403         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1404                         &nacl->acl_group.cg_item);
1405 }
1406
1407 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1408 {
1409         struct se_portal_group *tpg = nacl->se_tpg;
1410
1411         if (nacl->dynamic_node_acl) {
1412                 atomic_dec(&nacl->acl_pr_ref_count);
1413                 smp_mb__after_atomic_dec();
1414                 return;
1415         }
1416
1417         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1418                         &nacl->acl_group.cg_item);
1419
1420         atomic_dec(&nacl->acl_pr_ref_count);
1421         smp_mb__after_atomic_dec();
1422 }
1423
1424 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1425 {
1426         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1427         struct se_node_acl *nacl;
1428         struct se_portal_group *tpg;
1429         /*
1430          * For nacl->dynamic_node_acl=1
1431          */
1432         if (!lun_acl)
1433                 return 0;
1434
1435         nacl = lun_acl->se_lun_nacl;
1436         tpg = nacl->se_tpg;
1437
1438         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1439                         &lun_acl->se_lun_group.cg_item);
1440 }
1441
1442 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1443 {
1444         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1445         struct se_node_acl *nacl;
1446         struct se_portal_group *tpg;
1447         /*
1448          * For nacl->dynamic_node_acl=1
1449          */
1450         if (!lun_acl) {
1451                 atomic_dec(&se_deve->pr_ref_count);
1452                 smp_mb__after_atomic_dec();
1453                 return;
1454         }
1455         nacl = lun_acl->se_lun_nacl;
1456         tpg = nacl->se_tpg;
1457
1458         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1459                         &lun_acl->se_lun_group.cg_item);
1460
1461         atomic_dec(&se_deve->pr_ref_count);
1462         smp_mb__after_atomic_dec();
1463 }
1464
1465 static int core_scsi3_decode_spec_i_port(
1466         struct se_cmd *cmd,
1467         struct se_portal_group *tpg,
1468         unsigned char *l_isid,
1469         u64 sa_res_key,
1470         int all_tg_pt,
1471         int aptpl)
1472 {
1473         struct se_device *dev = cmd->se_dev;
1474         struct se_port *tmp_port;
1475         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1476         struct se_session *se_sess = cmd->se_sess;
1477         struct se_node_acl *dest_node_acl = NULL;
1478         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1479         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1480         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1481         struct list_head tid_dest_list;
1482         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1483         struct target_core_fabric_ops *tmp_tf_ops;
1484         unsigned char *buf;
1485         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1486         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1487         u32 tpdl, tid_len = 0;
1488         int ret, dest_local_nexus, prf_isid;
1489         u32 dest_rtpi = 0;
1490
1491         memset(dest_iport, 0, 64);
1492         INIT_LIST_HEAD(&tid_dest_list);
1493
1494         local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1495         /*
1496          * Allocate a struct pr_transport_id_holder and setup the
1497          * local_node_acl and local_se_deve pointers and add to
1498          * struct list_head tid_dest_list for add registration
1499          * processing in the loop of tid_dest_list below.
1500          */
1501         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1502         if (!tidh_new) {
1503                 pr_err("Unable to allocate tidh_new\n");
1504                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1505         }
1506         INIT_LIST_HEAD(&tidh_new->dest_list);
1507         tidh_new->dest_tpg = tpg;
1508         tidh_new->dest_node_acl = se_sess->se_node_acl;
1509         tidh_new->dest_se_deve = local_se_deve;
1510
1511         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1512                                 se_sess->se_node_acl, local_se_deve, l_isid,
1513                                 sa_res_key, all_tg_pt, aptpl);
1514         if (!local_pr_reg) {
1515                 kfree(tidh_new);
1516                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1517         }
1518         tidh_new->dest_pr_reg = local_pr_reg;
1519         /*
1520          * The local I_T nexus does not hold any configfs dependances,
1521          * so we set tid_h->dest_local_nexus=1 to prevent the
1522          * configfs_undepend_item() calls in the tid_dest_list loops below.
1523          */
1524         tidh_new->dest_local_nexus = 1;
1525         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1526
1527         buf = transport_kmap_first_data_page(cmd);
1528         /*
1529          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1530          * first extract TransportID Parameter Data Length, and make sure
1531          * the value matches up to the SCSI expected data transfer length.
1532          */
1533         tpdl = (buf[24] & 0xff) << 24;
1534         tpdl |= (buf[25] & 0xff) << 16;
1535         tpdl |= (buf[26] & 0xff) << 8;
1536         tpdl |= buf[27] & 0xff;
1537
1538         if ((tpdl + 28) != cmd->data_length) {
1539                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1540                         " does not equal CDB data_length: %u\n", tpdl,
1541                         cmd->data_length);
1542                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1543                 goto out;
1544         }
1545         /*
1546          * Start processing the received transport IDs using the
1547          * receiving I_T Nexus portal's fabric dependent methods to
1548          * obtain the SCSI Initiator Port/Device Identifiers.
1549          */
1550         ptr = &buf[28];
1551
1552         while (tpdl > 0) {
1553                 proto_ident = (ptr[0] & 0x0f);
1554                 dest_tpg = NULL;
1555
1556                 spin_lock(&dev->se_port_lock);
1557                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1558                         tmp_tpg = tmp_port->sep_tpg;
1559                         if (!tmp_tpg)
1560                                 continue;
1561                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1562                         if (!tmp_tf_ops)
1563                                 continue;
1564                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1565                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1566                                 continue;
1567                         /*
1568                          * Look for the matching proto_ident provided by
1569                          * the received TransportID
1570                          */
1571                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1572                         if (tmp_proto_ident != proto_ident)
1573                                 continue;
1574                         dest_rtpi = tmp_port->sep_rtpi;
1575
1576                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1577                                         tmp_tpg, (const char *)ptr, &tid_len,
1578                                         &iport_ptr);
1579                         if (!i_str)
1580                                 continue;
1581
1582                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1583                         smp_mb__after_atomic_inc();
1584                         spin_unlock(&dev->se_port_lock);
1585
1586                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1587                         if (ret != 0) {
1588                                 pr_err(" core_scsi3_tpg_depend_item()"
1589                                         " for tmp_tpg\n");
1590                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1591                                 smp_mb__after_atomic_dec();
1592                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1593                                 goto out;
1594                         }
1595                         /*
1596                          * Locate the desination initiator ACL to be registered
1597                          * from the decoded fabric module specific TransportID
1598                          * at *i_str.
1599                          */
1600                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1601                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1602                                                 tmp_tpg, i_str);
1603                         if (dest_node_acl) {
1604                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1605                                 smp_mb__after_atomic_inc();
1606                         }
1607                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1608
1609                         if (!dest_node_acl) {
1610                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1611                                 spin_lock(&dev->se_port_lock);
1612                                 continue;
1613                         }
1614
1615                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1616                         if (ret != 0) {
1617                                 pr_err("configfs_depend_item() failed"
1618                                         " for dest_node_acl->acl_group\n");
1619                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1620                                 smp_mb__after_atomic_dec();
1621                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1622                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1623                                 goto out;
1624                         }
1625
1626                         dest_tpg = tmp_tpg;
1627                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1628                                 " %s Port RTPI: %hu\n",
1629                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1630                                 dest_node_acl->initiatorname, dest_rtpi);
1631
1632                         spin_lock(&dev->se_port_lock);
1633                         break;
1634                 }
1635                 spin_unlock(&dev->se_port_lock);
1636
1637                 if (!dest_tpg) {
1638                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1639                                         " dest_tpg\n");
1640                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1641                         goto out;
1642                 }
1643 #if 0
1644                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1645                         " tid_len: %d for %s + %s\n",
1646                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1647                         tpdl, tid_len, i_str, iport_ptr);
1648 #endif
1649                 if (tid_len > tpdl) {
1650                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1651                                 " %u for Transport ID: %s\n", tid_len, ptr);
1652                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1653                         core_scsi3_tpg_undepend_item(dest_tpg);
1654                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1655                         goto out;
1656                 }
1657                 /*
1658                  * Locate the desintation struct se_dev_entry pointer for matching
1659                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1660                  * Target Port.
1661                  */
1662                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1663                                         dest_rtpi);
1664                 if (!dest_se_deve) {
1665                         pr_err("Unable to locate %s dest_se_deve"
1666                                 " from destination RTPI: %hu\n",
1667                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1668                                 dest_rtpi);
1669
1670                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1671                         core_scsi3_tpg_undepend_item(dest_tpg);
1672                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1673                         goto out;
1674                 }
1675
1676                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1677                 if (ret < 0) {
1678                         pr_err("core_scsi3_lunacl_depend_item()"
1679                                         " failed\n");
1680                         atomic_dec(&dest_se_deve->pr_ref_count);
1681                         smp_mb__after_atomic_dec();
1682                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1683                         core_scsi3_tpg_undepend_item(dest_tpg);
1684                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1685                         goto out;
1686                 }
1687 #if 0
1688                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1689                         " dest_se_deve mapped_lun: %u\n",
1690                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1691                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1692 #endif
1693                 /*
1694                  * Skip any TransportIDs that already have a registration for
1695                  * this target port.
1696                  */
1697                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1698                                         iport_ptr);
1699                 if (pr_reg_e) {
1700                         core_scsi3_put_pr_reg(pr_reg_e);
1701                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1702                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1703                         core_scsi3_tpg_undepend_item(dest_tpg);
1704                         ptr += tid_len;
1705                         tpdl -= tid_len;
1706                         tid_len = 0;
1707                         continue;
1708                 }
1709                 /*
1710                  * Allocate a struct pr_transport_id_holder and setup
1711                  * the dest_node_acl and dest_se_deve pointers for the
1712                  * loop below.
1713                  */
1714                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1715                                 GFP_KERNEL);
1716                 if (!tidh_new) {
1717                         pr_err("Unable to allocate tidh_new\n");
1718                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1719                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720                         core_scsi3_tpg_undepend_item(dest_tpg);
1721                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1722                         goto out;
1723                 }
1724                 INIT_LIST_HEAD(&tidh_new->dest_list);
1725                 tidh_new->dest_tpg = dest_tpg;
1726                 tidh_new->dest_node_acl = dest_node_acl;
1727                 tidh_new->dest_se_deve = dest_se_deve;
1728
1729                 /*
1730                  * Allocate, but do NOT add the registration for the
1731                  * TransportID referenced SCSI Initiator port.  This
1732                  * done because of the following from spc4r17 in section
1733                  * 6.14.3 wrt SPEC_I_PT:
1734                  *
1735                  * "If a registration fails for any initiator port (e.g., if th
1736                  * logical unit does not have enough resources available to
1737                  * hold the registration information), no registrations shall be
1738                  * made, and the command shall be terminated with
1739                  * CHECK CONDITION status."
1740                  *
1741                  * That means we call __core_scsi3_alloc_registration() here,
1742                  * and then call __core_scsi3_add_registration() in the
1743                  * 2nd loop which will never fail.
1744                  */
1745                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1746                                 dest_node_acl, dest_se_deve, iport_ptr,
1747                                 sa_res_key, all_tg_pt, aptpl);
1748                 if (!dest_pr_reg) {
1749                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1750                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1751                         core_scsi3_tpg_undepend_item(dest_tpg);
1752                         kfree(tidh_new);
1753                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1754                         goto out;
1755                 }
1756                 tidh_new->dest_pr_reg = dest_pr_reg;
1757                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1758
1759                 ptr += tid_len;
1760                 tpdl -= tid_len;
1761                 tid_len = 0;
1762
1763         }
1764
1765         transport_kunmap_first_data_page(cmd);
1766
1767         /*
1768          * Go ahead and create a registrations from tid_dest_list for the
1769          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1770          * and dest_se_deve.
1771          *
1772          * The SA Reservation Key from the PROUT is set for the
1773          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1774          * means that the TransportID Initiator port will be
1775          * registered on all of the target ports in the SCSI target device
1776          * ALL_TG_PT=0 means the registration will only be for the
1777          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1778          * was received.
1779          */
1780         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1781                 dest_tpg = tidh->dest_tpg;
1782                 dest_node_acl = tidh->dest_node_acl;
1783                 dest_se_deve = tidh->dest_se_deve;
1784                 dest_pr_reg = tidh->dest_pr_reg;
1785                 dest_local_nexus = tidh->dest_local_nexus;
1786
1787                 list_del(&tidh->dest_list);
1788                 kfree(tidh);
1789
1790                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1791                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1792                                                 PR_REG_ISID_ID_LEN);
1793
1794                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1795                                         dest_pr_reg, 0, 0);
1796
1797                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1798                         " registered Transport ID for Node: %s%s Mapped LUN:"
1799                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1800                         dest_node_acl->initiatorname, (prf_isid) ?
1801                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1802
1803                 if (dest_local_nexus)
1804                         continue;
1805
1806                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1807                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1808                 core_scsi3_tpg_undepend_item(dest_tpg);
1809         }
1810
1811         return 0;
1812 out:
1813         transport_kunmap_first_data_page(cmd);
1814         /*
1815          * For the failure case, release everything from tid_dest_list
1816          * including *dest_pr_reg and the configfs dependances..
1817          */
1818         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1819                 dest_tpg = tidh->dest_tpg;
1820                 dest_node_acl = tidh->dest_node_acl;
1821                 dest_se_deve = tidh->dest_se_deve;
1822                 dest_pr_reg = tidh->dest_pr_reg;
1823                 dest_local_nexus = tidh->dest_local_nexus;
1824
1825                 list_del(&tidh->dest_list);
1826                 kfree(tidh);
1827                 /*
1828                  * Release any extra ALL_TG_PT=1 registrations for
1829                  * the SPEC_I_PT=1 case.
1830                  */
1831                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1832                                 &dest_pr_reg->pr_reg_atp_list,
1833                                 pr_reg_atp_mem_list) {
1834                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1835                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1836                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1837                 }
1838
1839                 kfree(dest_pr_reg->pr_aptpl_buf);
1840                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1841
1842                 if (dest_local_nexus)
1843                         continue;
1844
1845                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1846                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1847                 core_scsi3_tpg_undepend_item(dest_tpg);
1848         }
1849         return ret;
1850 }
1851
1852 /*
1853  * Called with struct se_device->dev_reservation_lock held
1854  */
1855 static int __core_scsi3_update_aptpl_buf(
1856         struct se_device *dev,
1857         unsigned char *buf,
1858         u32 pr_aptpl_buf_len,
1859         int clear_aptpl_metadata)
1860 {
1861         struct se_lun *lun;
1862         struct se_portal_group *tpg;
1863         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1864         struct t10_pr_registration *pr_reg;
1865         unsigned char tmp[512], isid_buf[32];
1866         ssize_t len = 0;
1867         int reg_count = 0;
1868
1869         memset(buf, 0, pr_aptpl_buf_len);
1870         /*
1871          * Called to clear metadata once APTPL has been deactivated.
1872          */
1873         if (clear_aptpl_metadata) {
1874                 snprintf(buf, pr_aptpl_buf_len,
1875                                 "No Registrations or Reservations\n");
1876                 return 0;
1877         }
1878         /*
1879          * Walk the registration list..
1880          */
1881         spin_lock(&su_dev->t10_pr.registration_lock);
1882         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1883                         pr_reg_list) {
1884
1885                 tmp[0] = '\0';
1886                 isid_buf[0] = '\0';
1887                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1888                 lun = pr_reg->pr_reg_tg_pt_lun;
1889                 /*
1890                  * Write out any ISID value to APTPL metadata that was included
1891                  * in the original registration.
1892                  */
1893                 if (pr_reg->isid_present_at_reg)
1894                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1895                                         pr_reg->pr_reg_isid);
1896                 /*
1897                  * Include special metadata if the pr_reg matches the
1898                  * reservation holder.
1899                  */
1900                 if (dev->dev_pr_res_holder == pr_reg) {
1901                         snprintf(tmp, 512, "PR_REG_START: %d"
1902                                 "\ninitiator_fabric=%s\n"
1903                                 "initiator_node=%s\n%s"
1904                                 "sa_res_key=%llu\n"
1905                                 "res_holder=1\nres_type=%02x\n"
1906                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1907                                 "mapped_lun=%u\n", reg_count,
1908                                 tpg->se_tpg_tfo->get_fabric_name(),
1909                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1910                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1911                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1912                                 pr_reg->pr_res_mapped_lun);
1913                 } else {
1914                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1915                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1916                                 "sa_res_key=%llu\nres_holder=0\n"
1917                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1918                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1919                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1920                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1921                                 pr_reg->pr_res_mapped_lun);
1922                 }
1923
1924                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1925                         pr_err("Unable to update renaming"
1926                                 " APTPL metadata\n");
1927                         spin_unlock(&su_dev->t10_pr.registration_lock);
1928                         return -EMSGSIZE;
1929                 }
1930                 len += sprintf(buf+len, "%s", tmp);
1931
1932                 /*
1933                  * Include information about the associated SCSI target port.
1934                  */
1935                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1936                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1937                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1938                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1939                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1940                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1941
1942                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1943                         pr_err("Unable to update renaming"
1944                                 " APTPL metadata\n");
1945                         spin_unlock(&su_dev->t10_pr.registration_lock);
1946                         return -EMSGSIZE;
1947                 }
1948                 len += sprintf(buf+len, "%s", tmp);
1949                 reg_count++;
1950         }
1951         spin_unlock(&su_dev->t10_pr.registration_lock);
1952
1953         if (!reg_count)
1954                 len += sprintf(buf+len, "No Registrations or Reservations");
1955
1956         return 0;
1957 }
1958
1959 static int core_scsi3_update_aptpl_buf(
1960         struct se_device *dev,
1961         unsigned char *buf,
1962         u32 pr_aptpl_buf_len,
1963         int clear_aptpl_metadata)
1964 {
1965         int ret;
1966
1967         spin_lock(&dev->dev_reservation_lock);
1968         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1969                                 clear_aptpl_metadata);
1970         spin_unlock(&dev->dev_reservation_lock);
1971
1972         return ret;
1973 }
1974
1975 /*
1976  * Called with struct se_device->aptpl_file_mutex held
1977  */
1978 static int __core_scsi3_write_aptpl_to_file(
1979         struct se_device *dev,
1980         unsigned char *buf,
1981         u32 pr_aptpl_buf_len)
1982 {
1983         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1984         struct file *file;
1985         struct iovec iov[1];
1986         mm_segment_t old_fs;
1987         int flags = O_RDWR | O_CREAT | O_TRUNC;
1988         char path[512];
1989         int ret;
1990
1991         memset(iov, 0, sizeof(struct iovec));
1992         memset(path, 0, 512);
1993
1994         if (strlen(&wwn->unit_serial[0]) >= 512) {
1995                 pr_err("WWN value for struct se_device does not fit"
1996                         " into path buffer\n");
1997                 return -EMSGSIZE;
1998         }
1999
2000         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2001         file = filp_open(path, flags, 0600);
2002         if (IS_ERR(file) || !file || !file->f_dentry) {
2003                 pr_err("filp_open(%s) for APTPL metadata"
2004                         " failed\n", path);
2005                 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2006         }
2007
2008         iov[0].iov_base = &buf[0];
2009         if (!pr_aptpl_buf_len)
2010                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2011         else
2012                 iov[0].iov_len = pr_aptpl_buf_len;
2013
2014         old_fs = get_fs();
2015         set_fs(get_ds());
2016         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2017         set_fs(old_fs);
2018
2019         if (ret < 0) {
2020                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2021                 filp_close(file, NULL);
2022                 return -EIO;
2023         }
2024         filp_close(file, NULL);
2025
2026         return 0;
2027 }
2028
2029 static int core_scsi3_update_and_write_aptpl(
2030         struct se_device *dev,
2031         unsigned char *in_buf,
2032         u32 in_pr_aptpl_buf_len)
2033 {
2034         unsigned char null_buf[64], *buf;
2035         u32 pr_aptpl_buf_len;
2036         int ret, clear_aptpl_metadata = 0;
2037         /*
2038          * Can be called with a NULL pointer from PROUT service action CLEAR
2039          */
2040         if (!in_buf) {
2041                 memset(null_buf, 0, 64);
2042                 buf = &null_buf[0];
2043                 /*
2044                  * This will clear the APTPL metadata to:
2045                  * "No Registrations or Reservations" status
2046                  */
2047                 pr_aptpl_buf_len = 64;
2048                 clear_aptpl_metadata = 1;
2049         } else {
2050                 buf = in_buf;
2051                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2052         }
2053
2054         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2055                                 clear_aptpl_metadata);
2056         if (ret != 0)
2057                 return ret;
2058         /*
2059          * __core_scsi3_write_aptpl_to_file() will call strlen()
2060          * on the passed buf to determine pr_aptpl_buf_len.
2061          */
2062         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2063         if (ret != 0)
2064                 return ret;
2065
2066         return ret;
2067 }
2068
2069 static int core_scsi3_emulate_pro_register(
2070         struct se_cmd *cmd,
2071         u64 res_key,
2072         u64 sa_res_key,
2073         int aptpl,
2074         int all_tg_pt,
2075         int spec_i_pt,
2076         int ignore_key)
2077 {
2078         struct se_session *se_sess = cmd->se_sess;
2079         struct se_device *dev = cmd->se_dev;
2080         struct se_dev_entry *se_deve;
2081         struct se_lun *se_lun = cmd->se_lun;
2082         struct se_portal_group *se_tpg;
2083         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2084         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2085         /* Used for APTPL metadata w/ UNREGISTER */
2086         unsigned char *pr_aptpl_buf = NULL;
2087         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2088         int pr_holder = 0, ret = 0, type;
2089
2090         if (!se_sess || !se_lun) {
2091                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2092                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2093         }
2094         se_tpg = se_sess->se_tpg;
2095         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2096
2097         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2098                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2099                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2100                                 PR_REG_ISID_LEN);
2101                 isid_ptr = &isid_buf[0];
2102         }
2103         /*
2104          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2105          */
2106         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2107         if (!pr_reg_e) {
2108                 if (res_key) {
2109                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2110                                 " for SA REGISTER, returning CONFLICT\n");
2111                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2112                 }
2113                 /*
2114                  * Do nothing but return GOOD status.
2115                  */
2116                 if (!sa_res_key)
2117                         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2118
2119                 if (!spec_i_pt) {
2120                         /*
2121                          * Perform the Service Action REGISTER on the Initiator
2122                          * Port Endpoint that the PRO was received from on the
2123                          * Logical Unit of the SCSI device server.
2124                          */
2125                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2126                                         se_sess->se_node_acl, se_deve, isid_ptr,
2127                                         sa_res_key, all_tg_pt, aptpl,
2128                                         ignore_key, 0);
2129                         if (ret != 0) {
2130                                 pr_err("Unable to allocate"
2131                                         " struct t10_pr_registration\n");
2132                                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2133                         }
2134                 } else {
2135                         /*
2136                          * Register both the Initiator port that received
2137                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2138                          * TransportID from Parameter list and loop through
2139                          * fabric dependent parameter list while calling
2140                          * logic from of core_scsi3_alloc_registration() for
2141                          * each TransportID provided SCSI Initiator Port/Device
2142                          */
2143                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2144                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2145                         if (ret != 0)
2146                                 return ret;
2147                 }
2148                 /*
2149                  * Nothing left to do for the APTPL=0 case.
2150                  */
2151                 if (!aptpl) {
2152                         pr_tmpl->pr_aptpl_active = 0;
2153                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2154                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2155                                         " REGISTER\n");
2156                         return 0;
2157                 }
2158                 /*
2159                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2160                  * update the APTPL metadata information using its
2161                  * preallocated *pr_reg->pr_aptpl_buf.
2162                  */
2163                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2164                                 se_sess->se_node_acl, se_sess);
2165
2166                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2167                                 &pr_reg->pr_aptpl_buf[0],
2168                                 pr_tmpl->pr_aptpl_buf_len);
2169                 if (!ret) {
2170                         pr_tmpl->pr_aptpl_active = 1;
2171                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2172                 }
2173
2174                 core_scsi3_put_pr_reg(pr_reg);
2175                 return ret;
2176         } else {
2177                 /*
2178                  * Locate the existing *pr_reg via struct se_node_acl pointers
2179                  */
2180                 pr_reg = pr_reg_e;
2181                 type = pr_reg->pr_res_type;
2182
2183                 if (!ignore_key) {
2184                         if (res_key != pr_reg->pr_res_key) {
2185                                 pr_err("SPC-3 PR REGISTER: Received"
2186                                         " res_key: 0x%016Lx does not match"
2187                                         " existing SA REGISTER res_key:"
2188                                         " 0x%016Lx\n", res_key,
2189                                         pr_reg->pr_res_key);
2190                                 core_scsi3_put_pr_reg(pr_reg);
2191                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2192                         }
2193                 }
2194                 if (spec_i_pt) {
2195                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2196                                 " set while sa_res_key=0\n");
2197                         core_scsi3_put_pr_reg(pr_reg);
2198                         return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2199                 }
2200                 /*
2201                  * An existing ALL_TG_PT=1 registration being released
2202                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2203                  */
2204                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2205                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2206                                 " registration exists, but ALL_TG_PT=1 bit not"
2207                                 " present in received PROUT\n");
2208                         core_scsi3_put_pr_reg(pr_reg);
2209                         return PYX_TRANSPORT_INVALID_CDB_FIELD;
2210                 }
2211                 /*
2212                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2213                  */
2214                 if (aptpl) {
2215                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2216                                                 GFP_KERNEL);
2217                         if (!pr_aptpl_buf) {
2218                                 pr_err("Unable to allocate"
2219                                         " pr_aptpl_buf\n");
2220                                 core_scsi3_put_pr_reg(pr_reg);
2221                                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2222                         }
2223                 }
2224                 /*
2225                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2226                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2227                  * Nexus.
2228                  */
2229                 if (!sa_res_key) {
2230                         pr_holder = core_scsi3_check_implict_release(
2231                                         cmd->se_dev, pr_reg);
2232                         if (pr_holder < 0) {
2233                                 kfree(pr_aptpl_buf);
2234                                 core_scsi3_put_pr_reg(pr_reg);
2235                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2236                         }
2237
2238                         spin_lock(&pr_tmpl->registration_lock);
2239                         /*
2240                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2241                          * and matching pr_res_key.
2242                          */
2243                         if (pr_reg->pr_reg_all_tg_pt) {
2244                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2245                                                 &pr_tmpl->registration_list,
2246                                                 pr_reg_list) {
2247
2248                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2249                                                 continue;
2250
2251                                         if (pr_reg_p->pr_res_key != res_key)
2252                                                 continue;
2253
2254                                         if (pr_reg == pr_reg_p)
2255                                                 continue;
2256
2257                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2258                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2259                                                 continue;
2260
2261                                         __core_scsi3_free_registration(dev,
2262                                                         pr_reg_p, NULL, 0);
2263                                 }
2264                         }
2265                         /*
2266                          * Release the calling I_T Nexus registration now..
2267                          */
2268                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2269                                                         NULL, 1);
2270                         /*
2271                          * From spc4r17, section 5.7.11.3 Unregistering
2272                          *
2273                          * If the persistent reservation is a registrants only
2274                          * type, the device server shall establish a unit
2275                          * attention condition for the initiator port associated
2276                          * with every registered I_T nexus except for the I_T
2277                          * nexus on which the PERSISTENT RESERVE OUT command was
2278                          * received, with the additional sense code set to
2279                          * RESERVATIONS RELEASED.
2280                          */
2281                         if (pr_holder &&
2282                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2283                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2284                                 list_for_each_entry(pr_reg_p,
2285                                                 &pr_tmpl->registration_list,
2286                                                 pr_reg_list) {
2287
2288                                         core_scsi3_ua_allocate(
2289                                                 pr_reg_p->pr_reg_nacl,
2290                                                 pr_reg_p->pr_res_mapped_lun,
2291                                                 0x2A,
2292                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2293                                 }
2294                         }
2295                         spin_unlock(&pr_tmpl->registration_lock);
2296
2297                         if (!aptpl) {
2298                                 pr_tmpl->pr_aptpl_active = 0;
2299                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2300                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2301                                                 " for UNREGISTER\n");
2302                                 return 0;
2303                         }
2304
2305                         ret = core_scsi3_update_and_write_aptpl(dev,
2306                                         &pr_aptpl_buf[0],
2307                                         pr_tmpl->pr_aptpl_buf_len);
2308                         if (!ret) {
2309                                 pr_tmpl->pr_aptpl_active = 1;
2310                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2311                                                 " for UNREGISTER\n");
2312                         }
2313
2314                         kfree(pr_aptpl_buf);
2315                         return ret;
2316                 } else {
2317                         /*
2318                          * Increment PRgeneration counter for struct se_device"
2319                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2320                          * READ_KEYS service action.
2321                          */
2322                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2323                                                         cmd->se_dev);
2324                         pr_reg->pr_res_key = sa_res_key;
2325                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2326                                 " Key for %s to: 0x%016Lx PRgeneration:"
2327                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2328                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2329                                 pr_reg->pr_reg_nacl->initiatorname,
2330                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2331
2332                         if (!aptpl) {
2333                                 pr_tmpl->pr_aptpl_active = 0;
2334                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2335                                 core_scsi3_put_pr_reg(pr_reg);
2336                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2337                                                 " for REGISTER\n");
2338                                 return 0;
2339                         }
2340
2341                         ret = core_scsi3_update_and_write_aptpl(dev,
2342                                         &pr_aptpl_buf[0],
2343                                         pr_tmpl->pr_aptpl_buf_len);
2344                         if (!ret) {
2345                                 pr_tmpl->pr_aptpl_active = 1;
2346                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2347                                                 " for REGISTER\n");
2348                         }
2349
2350                         kfree(pr_aptpl_buf);
2351                         core_scsi3_put_pr_reg(pr_reg);
2352                 }
2353         }
2354         return 0;
2355 }
2356
2357 unsigned char *core_scsi3_pr_dump_type(int type)
2358 {
2359         switch (type) {
2360         case PR_TYPE_WRITE_EXCLUSIVE:
2361                 return "Write Exclusive Access";
2362         case PR_TYPE_EXCLUSIVE_ACCESS:
2363                 return "Exclusive Access";
2364         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2365                 return "Write Exclusive Access, Registrants Only";
2366         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2367                 return "Exclusive Access, Registrants Only";
2368         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2369                 return "Write Exclusive Access, All Registrants";
2370         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2371                 return "Exclusive Access, All Registrants";
2372         default:
2373                 break;
2374         }
2375
2376         return "Unknown SPC-3 PR Type";
2377 }
2378
2379 static int core_scsi3_pro_reserve(
2380         struct se_cmd *cmd,
2381         struct se_device *dev,
2382         int type,
2383         int scope,
2384         u64 res_key)
2385 {
2386         struct se_session *se_sess = cmd->se_sess;
2387         struct se_dev_entry *se_deve;
2388         struct se_lun *se_lun = cmd->se_lun;
2389         struct se_portal_group *se_tpg;
2390         struct t10_pr_registration *pr_reg, *pr_res_holder;
2391         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2392         char i_buf[PR_REG_ISID_ID_LEN];
2393         int ret, prf_isid;
2394
2395         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2396
2397         if (!se_sess || !se_lun) {
2398                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2399                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2400         }
2401         se_tpg = se_sess->se_tpg;
2402         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2403         /*
2404          * Locate the existing *pr_reg via struct se_node_acl pointers
2405          */
2406         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2407                                 se_sess);
2408         if (!pr_reg) {
2409                 pr_err("SPC-3 PR: Unable to locate"
2410                         " PR_REGISTERED *pr_reg for RESERVE\n");
2411                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2412         }
2413         /*
2414          * From spc4r17 Section 5.7.9: Reserving:
2415          *
2416          * An application client creates a persistent reservation by issuing
2417          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2418          * a registered I_T nexus with the following parameters:
2419          *    a) RESERVATION KEY set to the value of the reservation key that is
2420          *       registered with the logical unit for the I_T nexus; and
2421          */
2422         if (res_key != pr_reg->pr_res_key) {
2423                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2424                         " does not match existing SA REGISTER res_key:"
2425                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2426                 core_scsi3_put_pr_reg(pr_reg);
2427                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2428         }
2429         /*
2430          * From spc4r17 Section 5.7.9: Reserving:
2431          *
2432          * From above:
2433          *  b) TYPE field and SCOPE field set to the persistent reservation
2434          *     being created.
2435          *
2436          * Only one persistent reservation is allowed at a time per logical unit
2437          * and that persistent reservation has a scope of LU_SCOPE.
2438          */
2439         if (scope != PR_SCOPE_LU_SCOPE) {
2440                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2441                 core_scsi3_put_pr_reg(pr_reg);
2442                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2443         }
2444         /*
2445          * See if we have an existing PR reservation holder pointer at
2446          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2447          * *pr_res_holder.
2448          */
2449         spin_lock(&dev->dev_reservation_lock);
2450         pr_res_holder = dev->dev_pr_res_holder;
2451         if ((pr_res_holder)) {
2452                 /*
2453                  * From spc4r17 Section 5.7.9: Reserving:
2454                  *
2455                  * If the device server receives a PERSISTENT RESERVE OUT
2456                  * command from an I_T nexus other than a persistent reservation
2457                  * holder (see 5.7.10) that attempts to create a persistent
2458                  * reservation when a persistent reservation already exists for
2459                  * the logical unit, then the command shall be completed with
2460                  * RESERVATION CONFLICT status.
2461                  */
2462                 if (pr_res_holder != pr_reg) {
2463                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2464                         pr_err("SPC-3 PR: Attempted RESERVE from"
2465                                 " [%s]: %s while reservation already held by"
2466                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2467                                 cmd->se_tfo->get_fabric_name(),
2468                                 se_sess->se_node_acl->initiatorname,
2469                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2470                                 pr_res_holder->pr_reg_nacl->initiatorname);
2471
2472                         spin_unlock(&dev->dev_reservation_lock);
2473                         core_scsi3_put_pr_reg(pr_reg);
2474                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2475                 }
2476                 /*
2477                  * From spc4r17 Section 5.7.9: Reserving:
2478                  *
2479                  * If a persistent reservation holder attempts to modify the
2480                  * type or scope of an existing persistent reservation, the
2481                  * command shall be completed with RESERVATION CONFLICT status.
2482                  */
2483                 if ((pr_res_holder->pr_res_type != type) ||
2484                     (pr_res_holder->pr_res_scope != scope)) {
2485                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2486                         pr_err("SPC-3 PR: Attempted RESERVE from"
2487                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2488                                 " while reservation already held by [%s]: %s,"
2489                                 " returning RESERVATION_CONFLICT\n",
2490                                 cmd->se_tfo->get_fabric_name(),
2491                                 se_sess->se_node_acl->initiatorname,
2492                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2493                                 pr_res_holder->pr_reg_nacl->initiatorname);
2494
2495                         spin_unlock(&dev->dev_reservation_lock);
2496                         core_scsi3_put_pr_reg(pr_reg);
2497                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2498                 }
2499                 /*
2500                  * From spc4r17 Section 5.7.9: Reserving:
2501                  *
2502                  * If the device server receives a PERSISTENT RESERVE OUT
2503                  * command with RESERVE service action where the TYPE field and
2504                  * the SCOPE field contain the same values as the existing type
2505                  * and scope from a persistent reservation holder, it shall not
2506                  * make any change to the existing persistent reservation and
2507                  * shall completethe command with GOOD status.
2508                  */
2509                 spin_unlock(&dev->dev_reservation_lock);
2510                 core_scsi3_put_pr_reg(pr_reg);
2511                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2512         }
2513         /*
2514          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2515          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2516          */
2517         pr_reg->pr_res_scope = scope;
2518         pr_reg->pr_res_type = type;
2519         pr_reg->pr_res_holder = 1;
2520         dev->dev_pr_res_holder = pr_reg;
2521         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2522                                 PR_REG_ISID_ID_LEN);
2523
2524         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2525                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2526                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2527                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2528         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2529                         cmd->se_tfo->get_fabric_name(),
2530                         se_sess->se_node_acl->initiatorname,
2531                         (prf_isid) ? &i_buf[0] : "");
2532         spin_unlock(&dev->dev_reservation_lock);
2533
2534         if (pr_tmpl->pr_aptpl_active) {
2535                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2536                                 &pr_reg->pr_aptpl_buf[0],
2537                                 pr_tmpl->pr_aptpl_buf_len);
2538                 if (!ret)
2539                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2540                                         " for RESERVE\n");
2541         }
2542
2543         core_scsi3_put_pr_reg(pr_reg);
2544         return 0;
2545 }
2546
2547 static int core_scsi3_emulate_pro_reserve(
2548         struct se_cmd *cmd,
2549         int type,
2550         int scope,
2551         u64 res_key)
2552 {
2553         struct se_device *dev = cmd->se_dev;
2554         int ret = 0;
2555
2556         switch (type) {
2557         case PR_TYPE_WRITE_EXCLUSIVE:
2558         case PR_TYPE_EXCLUSIVE_ACCESS:
2559         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2560         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2561         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2562         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2563                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2564                 break;
2565         default:
2566                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2567                         " 0x%02x\n", type);
2568                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2569         }
2570
2571         return ret;
2572 }
2573
2574 /*
2575  * Called with struct se_device->dev_reservation_lock held.
2576  */
2577 static void __core_scsi3_complete_pro_release(
2578         struct se_device *dev,
2579         struct se_node_acl *se_nacl,
2580         struct t10_pr_registration *pr_reg,
2581         int explict)
2582 {
2583         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2584         char i_buf[PR_REG_ISID_ID_LEN];
2585         int prf_isid;
2586
2587         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2588         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2589                                 PR_REG_ISID_ID_LEN);
2590         /*
2591          * Go ahead and release the current PR reservation holder.
2592          */
2593         dev->dev_pr_res_holder = NULL;
2594
2595         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2596                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2597                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2598                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2599                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2600         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2601                 tfo->get_fabric_name(), se_nacl->initiatorname,
2602                 (prf_isid) ? &i_buf[0] : "");
2603         /*
2604          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2605          */
2606         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2607 }
2608
2609 static int core_scsi3_emulate_pro_release(
2610         struct se_cmd *cmd,
2611         int type,
2612         int scope,
2613         u64 res_key)
2614 {
2615         struct se_device *dev = cmd->se_dev;
2616         struct se_session *se_sess = cmd->se_sess;
2617         struct se_lun *se_lun = cmd->se_lun;
2618         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2619         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2620         int ret, all_reg = 0;
2621
2622         if (!se_sess || !se_lun) {
2623                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2624                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2625         }
2626         /*
2627          * Locate the existing *pr_reg via struct se_node_acl pointers
2628          */
2629         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2630         if (!pr_reg) {
2631                 pr_err("SPC-3 PR: Unable to locate"
2632                         " PR_REGISTERED *pr_reg for RELEASE\n");
2633                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2634         }
2635         /*
2636          * From spc4r17 Section 5.7.11.2 Releasing:
2637          *
2638          * If there is no persistent reservation or in response to a persistent
2639          * reservation release request from a registered I_T nexus that is not a
2640          * persistent reservation holder (see 5.7.10), the device server shall
2641          * do the following:
2642          *
2643          *     a) Not release the persistent reservation, if any;
2644          *     b) Not remove any registrations; and
2645          *     c) Complete the command with GOOD status.
2646          */
2647         spin_lock(&dev->dev_reservation_lock);
2648         pr_res_holder = dev->dev_pr_res_holder;
2649         if (!pr_res_holder) {
2650                 /*
2651                  * No persistent reservation, return GOOD status.
2652                  */
2653                 spin_unlock(&dev->dev_reservation_lock);
2654                 core_scsi3_put_pr_reg(pr_reg);
2655                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2656         }
2657         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2658             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2659                 all_reg = 1;
2660
2661         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2662                 /*
2663                  * Non 'All Registrants' PR Type cases..
2664                  * Release request from a registered I_T nexus that is not a
2665                  * persistent reservation holder. return GOOD status.
2666                  */
2667                 spin_unlock(&dev->dev_reservation_lock);
2668                 core_scsi3_put_pr_reg(pr_reg);
2669                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2670         }
2671         /*
2672          * From spc4r17 Section 5.7.11.2 Releasing:
2673          *
2674          * Only the persistent reservation holder (see 5.7.10) is allowed to
2675          * release a persistent reservation.
2676          *
2677          * An application client releases the persistent reservation by issuing
2678          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2679          * an I_T nexus that is a persistent reservation holder with the
2680          * following parameters:
2681          *
2682          *     a) RESERVATION KEY field set to the value of the reservation key
2683          *        that is registered with the logical unit for the I_T nexus;
2684          */
2685         if (res_key != pr_reg->pr_res_key) {
2686                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2687                         " does not match existing SA REGISTER res_key:"
2688                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2689                 spin_unlock(&dev->dev_reservation_lock);
2690                 core_scsi3_put_pr_reg(pr_reg);
2691                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2692         }
2693         /*
2694          * From spc4r17 Section 5.7.11.2 Releasing and above:
2695          *
2696          * b) TYPE field and SCOPE field set to match the persistent
2697          *    reservation being released.
2698          */
2699         if ((pr_res_holder->pr_res_type != type) ||
2700             (pr_res_holder->pr_res_scope != scope)) {
2701                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2702                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2703                         " reservation from [%s]: %s with different TYPE "
2704                         "and/or SCOPE  while reservation already held by"
2705                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2706                         cmd->se_tfo->get_fabric_name(),
2707                         se_sess->se_node_acl->initiatorname,
2708                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2709                         pr_res_holder->pr_reg_nacl->initiatorname);
2710
2711                 spin_unlock(&dev->dev_reservation_lock);
2712                 core_scsi3_put_pr_reg(pr_reg);
2713                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2714         }
2715         /*
2716          * In response to a persistent reservation release request from the
2717          * persistent reservation holder the device server shall perform a
2718          * release by doing the following as an uninterrupted series of actions:
2719          * a) Release the persistent reservation;
2720          * b) Not remove any registration(s);
2721          * c) If the released persistent reservation is a registrants only type
2722          * or all registrants type persistent reservation,
2723          *    the device server shall establish a unit attention condition for
2724          *    the initiator port associated with every regis-
2725          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2726          *    RESERVE OUT command with RELEASE service action was received,
2727          *    with the additional sense code set to RESERVATIONS RELEASED; and
2728          * d) If the persistent reservation is of any other type, the device
2729          *    server shall not establish a unit attention condition.
2730          */
2731         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2732                         pr_reg, 1);
2733
2734         spin_unlock(&dev->dev_reservation_lock);
2735
2736         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2737             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2738             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2739             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2740                 /*
2741                  * If no UNIT ATTENTION conditions will be established for
2742                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2743                  * go ahead and check for APTPL=1 update+write below
2744                  */
2745                 goto write_aptpl;
2746         }
2747
2748         spin_lock(&pr_tmpl->registration_lock);
2749         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2750                         pr_reg_list) {
2751                 /*
2752                  * Do not establish a UNIT ATTENTION condition
2753                  * for the calling I_T Nexus
2754                  */
2755                 if (pr_reg_p == pr_reg)
2756                         continue;
2757
2758                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2759                                 pr_reg_p->pr_res_mapped_lun,
2760                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2761         }
2762         spin_unlock(&pr_tmpl->registration_lock);
2763
2764 write_aptpl:
2765         if (pr_tmpl->pr_aptpl_active) {
2766                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2767                                 &pr_reg->pr_aptpl_buf[0],
2768                                 pr_tmpl->pr_aptpl_buf_len);
2769                 if (!ret)
2770                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2771         }
2772
2773         core_scsi3_put_pr_reg(pr_reg);
2774         return 0;
2775 }
2776
2777 static int core_scsi3_emulate_pro_clear(
2778         struct se_cmd *cmd,
2779         u64 res_key)
2780 {
2781         struct se_device *dev = cmd->se_dev;
2782         struct se_node_acl *pr_reg_nacl;
2783         struct se_session *se_sess = cmd->se_sess;
2784         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2785         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2786         u32 pr_res_mapped_lun = 0;
2787         int calling_it_nexus = 0;
2788         /*
2789          * Locate the existing *pr_reg via struct se_node_acl pointers
2790          */
2791         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2792                         se_sess->se_node_acl, se_sess);
2793         if (!pr_reg_n) {
2794                 pr_err("SPC-3 PR: Unable to locate"
2795                         " PR_REGISTERED *pr_reg for CLEAR\n");
2796                         return PYX_TRANSPORT_LU_COMM_FAILURE;
2797         }
2798         /*
2799          * From spc4r17 section 5.7.11.6, Clearing:
2800          *
2801          * Any application client may release the persistent reservation and
2802          * remove all registrations from a device server by issuing a
2803          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2804          * registered I_T nexus with the following parameter:
2805          *
2806          *      a) RESERVATION KEY field set to the value of the reservation key
2807          *         that is registered with the logical unit for the I_T nexus.
2808          */
2809         if (res_key != pr_reg_n->pr_res_key) {
2810                 pr_err("SPC-3 PR REGISTER: Received"
2811                         " res_key: 0x%016Lx does not match"
2812                         " existing SA REGISTER res_key:"
2813                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2814                 core_scsi3_put_pr_reg(pr_reg_n);
2815                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2816         }
2817         /*
2818          * a) Release the persistent reservation, if any;
2819          */
2820         spin_lock(&dev->dev_reservation_lock);
2821         pr_res_holder = dev->dev_pr_res_holder;
2822         if (pr_res_holder) {
2823                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2824                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2825                         pr_res_holder, 0);
2826         }
2827         spin_unlock(&dev->dev_reservation_lock);
2828         /*
2829          * b) Remove all registration(s) (see spc4r17 5.7.7);
2830          */
2831         spin_lock(&pr_tmpl->registration_lock);
2832         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2833                         &pr_tmpl->registration_list, pr_reg_list) {
2834
2835                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2836                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2837                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2838                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2839                                         calling_it_nexus);
2840                 /*
2841                  * e) Establish a unit attention condition for the initiator
2842                  *    port associated with every registered I_T nexus other
2843                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2844                  *    command with CLEAR service action was received, with the
2845                  *    additional sense code set to RESERVATIONS PREEMPTED.
2846                  */
2847                 if (!calling_it_nexus)
2848                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2849                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2850         }
2851         spin_unlock(&pr_tmpl->registration_lock);
2852
2853         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2854                 cmd->se_tfo->get_fabric_name());
2855
2856         if (pr_tmpl->pr_aptpl_active) {
2857                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2858                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2859                                 " for CLEAR\n");
2860         }
2861
2862         core_scsi3_pr_generation(dev);
2863         return 0;
2864 }
2865
2866 /*
2867  * Called with struct se_device->dev_reservation_lock held.
2868  */
2869 static void __core_scsi3_complete_pro_preempt(
2870         struct se_device *dev,
2871         struct t10_pr_registration *pr_reg,
2872         struct list_head *preempt_and_abort_list,
2873         int type,
2874         int scope,
2875         int abort)
2876 {
2877         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2878         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2879         char i_buf[PR_REG_ISID_ID_LEN];
2880         int prf_isid;
2881
2882         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2883         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2884                                 PR_REG_ISID_ID_LEN);
2885         /*
2886          * Do an implict RELEASE of the existing reservation.
2887          */
2888         if (dev->dev_pr_res_holder)
2889                 __core_scsi3_complete_pro_release(dev, nacl,
2890                                 dev->dev_pr_res_holder, 0);
2891
2892         dev->dev_pr_res_holder = pr_reg;
2893         pr_reg->pr_res_holder = 1;
2894         pr_reg->pr_res_type = type;
2895         pr_reg->pr_res_scope = scope;
2896
2897         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2898                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2899                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2900                 core_scsi3_pr_dump_type(type),
2901                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2902         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2903                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2904                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2905         /*
2906          * For PREEMPT_AND_ABORT, add the preempting reservation's
2907          * struct t10_pr_registration to the list that will be compared
2908          * against received CDBs..
2909          */
2910         if (preempt_and_abort_list)
2911                 list_add_tail(&pr_reg->pr_reg_abort_list,
2912                                 preempt_and_abort_list);
2913 }
2914
2915 static void core_scsi3_release_preempt_and_abort(
2916         struct list_head *preempt_and_abort_list,
2917         struct t10_pr_registration *pr_reg_holder)
2918 {
2919         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2920
2921         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2922                                 pr_reg_abort_list) {
2923
2924                 list_del(&pr_reg->pr_reg_abort_list);
2925                 if (pr_reg_holder == pr_reg)
2926                         continue;
2927                 if (pr_reg->pr_res_holder) {
2928                         pr_warn("pr_reg->pr_res_holder still set\n");
2929                         continue;
2930                 }
2931
2932                 pr_reg->pr_reg_deve = NULL;
2933                 pr_reg->pr_reg_nacl = NULL;
2934                 kfree(pr_reg->pr_aptpl_buf);
2935                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2936         }
2937 }
2938
2939 int core_scsi3_check_cdb_abort_and_preempt(
2940         struct list_head *preempt_and_abort_list,
2941         struct se_cmd *cmd)
2942 {
2943         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2944
2945         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2946                                 pr_reg_abort_list) {
2947                 if (pr_reg->pr_res_key == cmd->pr_res_key)
2948                         return 0;
2949         }
2950
2951         return 1;
2952 }
2953
2954 static int core_scsi3_pro_preempt(
2955         struct se_cmd *cmd,
2956         int type,
2957         int scope,
2958         u64 res_key,
2959         u64 sa_res_key,
2960         int abort)
2961 {
2962         struct se_device *dev = cmd->se_dev;
2963         struct se_dev_entry *se_deve;
2964         struct se_node_acl *pr_reg_nacl;
2965         struct se_session *se_sess = cmd->se_sess;
2966         struct list_head preempt_and_abort_list;
2967         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2968         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2969         u32 pr_res_mapped_lun = 0;
2970         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2971         int prh_type = 0, prh_scope = 0, ret;
2972
2973         if (!se_sess)
2974                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2975
2976         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2977         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2978                                 se_sess);
2979         if (!pr_reg_n) {
2980                 pr_err("SPC-3 PR: Unable to locate"
2981                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2982                         (abort) ? "_AND_ABORT" : "");
2983                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2984         }
2985         if (pr_reg_n->pr_res_key != res_key) {
2986                 core_scsi3_put_pr_reg(pr_reg_n);
2987                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2988         }
2989         if (scope != PR_SCOPE_LU_SCOPE) {
2990                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2991                 core_scsi3_put_pr_reg(pr_reg_n);
2992                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2993         }
2994         INIT_LIST_HEAD(&preempt_and_abort_list);
2995
2996         spin_lock(&dev->dev_reservation_lock);
2997         pr_res_holder = dev->dev_pr_res_holder;
2998         if (pr_res_holder &&
2999            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3000             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3001                 all_reg = 1;
3002
3003         if (!all_reg && !sa_res_key) {
3004                 spin_unlock(&dev->dev_reservation_lock);
3005                 core_scsi3_put_pr_reg(pr_reg_n);
3006                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3007         }
3008         /*
3009          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3010          *
3011          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3012          * persistent reservation holder or there is no persistent reservation
3013          * holder (i.e., there is no persistent reservation), then the device
3014          * server shall perform a preempt by doing the following in an
3015          * uninterrupted series of actions. (See below..)
3016          */
3017         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3018                 /*
3019                  * No existing or SA Reservation Key matching reservations..
3020                  *
3021                  * PROUT SA PREEMPT with All Registrant type reservations are
3022                  * allowed to be processed without a matching SA Reservation Key
3023                  */
3024                 spin_lock(&pr_tmpl->registration_lock);
3025                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3026                                 &pr_tmpl->registration_list, pr_reg_list) {
3027                         /*
3028                          * Removing of registrations in non all registrants
3029                          * type reservations without a matching SA reservation
3030                          * key.
3031                          *
3032                          * a) Remove the registrations for all I_T nexuses
3033                          *    specified by the SERVICE ACTION RESERVATION KEY
3034                          *    field;
3035                          * b) Ignore the contents of the SCOPE and TYPE fields;
3036                          * c) Process tasks as defined in 5.7.1; and
3037                          * d) Establish a unit attention condition for the
3038                          *    initiator port associated with every I_T nexus
3039                          *    that lost its registration other than the I_T
3040                          *    nexus on which the PERSISTENT RESERVE OUT command
3041                          *    was received, with the additional sense code set
3042                          *    to REGISTRATIONS PREEMPTED.
3043                          */
3044                         if (!all_reg) {
3045                                 if (pr_reg->pr_res_key != sa_res_key)
3046                                         continue;
3047
3048                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3049                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3050                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3051                                 __core_scsi3_free_registration(dev, pr_reg,
3052                                         (abort) ? &preempt_and_abort_list :
3053                                                 NULL, calling_it_nexus);
3054                                 released_regs++;
3055                         } else {
3056                                 /*
3057                                  * Case for any existing all registrants type
3058                                  * reservation, follow logic in spc4r17 section
3059                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3060                                  *
3061                                  * For a ZERO SA Reservation key, release
3062                                  * all other registrations and do an implict
3063                                  * release of active persistent reservation.
3064                                  *
3065                                  * For a non-ZERO SA Reservation key, only
3066                                  * release the matching reservation key from
3067                                  * registrations.
3068                                  */
3069                                 if ((sa_res_key) &&
3070                                      (pr_reg->pr_res_key != sa_res_key))
3071                                         continue;
3072
3073                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3074                                 if (calling_it_nexus)
3075                                         continue;
3076
3077                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3078                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3079                                 __core_scsi3_free_registration(dev, pr_reg,
3080                                         (abort) ? &preempt_and_abort_list :
3081                                                 NULL, 0);
3082                                 released_regs++;
3083                         }
3084                         if (!calling_it_nexus)
3085                                 core_scsi3_ua_allocate(pr_reg_nacl,
3086                                         pr_res_mapped_lun, 0x2A,
3087                                         ASCQ_2AH_RESERVATIONS_PREEMPTED);
3088                 }
3089                 spin_unlock(&pr_tmpl->registration_lock);
3090                 /*
3091                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3092                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3093                  * RESERVATION KEY field to a value that does not match any
3094                  * registered reservation key, then the device server shall
3095                  * complete the command with RESERVATION CONFLICT status.
3096                  */
3097                 if (!released_regs) {
3098                         spin_unlock(&dev->dev_reservation_lock);
3099                         core_scsi3_put_pr_reg(pr_reg_n);
3100                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
3101                 }
3102                 /*
3103                  * For an existing all registrants type reservation
3104                  * with a zero SA rservation key, preempt the existing
3105                  * reservation with the new PR type and scope.
3106                  */
3107                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3108                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3109                                 (abort) ? &preempt_and_abort_list : NULL,
3110                                 type, scope, abort);
3111
3112                         if (abort)
3113                                 core_scsi3_release_preempt_and_abort(
3114                                         &preempt_and_abort_list, pr_reg_n);
3115                 }
3116                 spin_unlock(&dev->dev_reservation_lock);
3117
3118                 if (pr_tmpl->pr_aptpl_active) {
3119                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3120                                         &pr_reg_n->pr_aptpl_buf[0],
3121                                         pr_tmpl->pr_aptpl_buf_len);
3122                         if (!ret)
3123                                 pr_debug("SPC-3 PR: Updated APTPL"
3124                                         " metadata for  PREEMPT%s\n", (abort) ?
3125                                         "_AND_ABORT" : "");
3126                 }
3127
3128                 core_scsi3_put_pr_reg(pr_reg_n);
3129                 core_scsi3_pr_generation(cmd->se_dev);
3130                 return 0;
3131         }
3132         /*
3133          * The PREEMPTing SA reservation key matches that of the
3134          * existing persistent reservation, first, we check if
3135          * we are preempting our own reservation.
3136          * From spc4r17, section 5.7.11.4.3 Preempting
3137          * persistent reservations and registration handling
3138          *
3139          * If an all registrants persistent reservation is not
3140          * present, it is not an error for the persistent
3141          * reservation holder to preempt itself (i.e., a
3142          * PERSISTENT RESERVE OUT with a PREEMPT service action
3143          * or a PREEMPT AND ABORT service action with the
3144          * SERVICE ACTION RESERVATION KEY value equal to the
3145          * persistent reservation holder's reservation key that
3146          * is received from the persistent reservation holder).
3147          * In that case, the device server shall establish the
3148          * new persistent reservation and maintain the
3149          * registration.
3150          */
3151         prh_type = pr_res_holder->pr_res_type;
3152         prh_scope = pr_res_holder->pr_res_scope;
3153         /*
3154          * If the SERVICE ACTION RESERVATION KEY field identifies a
3155          * persistent reservation holder (see 5.7.10), the device
3156          * server shall perform a preempt by doing the following as
3157          * an uninterrupted series of actions:
3158          *
3159          * a) Release the persistent reservation for the holder
3160          *    identified by the SERVICE ACTION RESERVATION KEY field;
3161          */
3162         if (pr_reg_n != pr_res_holder)
3163                 __core_scsi3_complete_pro_release(dev,
3164                                 pr_res_holder->pr_reg_nacl,
3165                                 dev->dev_pr_res_holder, 0);
3166         /*
3167          * b) Remove the registrations for all I_T nexuses identified
3168          *    by the SERVICE ACTION RESERVATION KEY field, except the
3169          *    I_T nexus that is being used for the PERSISTENT RESERVE
3170          *    OUT command. If an all registrants persistent reservation
3171          *    is present and the SERVICE ACTION RESERVATION KEY field
3172          *    is set to zero, then all registrations shall be removed
3173          *    except for that of the I_T nexus that is being used for
3174          *    the PERSISTENT RESERVE OUT command;
3175          */
3176         spin_lock(&pr_tmpl->registration_lock);
3177         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3178                         &pr_tmpl->registration_list, pr_reg_list) {
3179
3180                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3181                 if (calling_it_nexus)
3182                         continue;
3183
3184                 if (pr_reg->pr_res_key != sa_res_key)
3185                         continue;
3186
3187                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3188                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3189                 __core_scsi3_free_registration(dev, pr_reg,
3190                                 (abort) ? &preempt_and_abort_list : NULL,
3191                                 calling_it_nexus);
3192                 /*
3193                  * e) Establish a unit attention condition for the initiator
3194                  *    port associated with every I_T nexus that lost its
3195                  *    persistent reservation and/or registration, with the
3196                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3197                  */
3198                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3199                                 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3200         }
3201         spin_unlock(&pr_tmpl->registration_lock);
3202         /*
3203          * c) Establish a persistent reservation for the preempting
3204          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3205          */
3206         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3207                         (abort) ? &preempt_and_abort_list : NULL,
3208                         type, scope, abort);
3209         /*
3210          * d) Process tasks as defined in 5.7.1;
3211          * e) See above..
3212          * f) If the type or scope has changed, then for every I_T nexus
3213          *    whose reservation key was not removed, except for the I_T
3214          *    nexus on which the PERSISTENT RESERVE OUT command was
3215          *    received, the device server shall establish a unit
3216          *    attention condition for the initiator port associated with
3217          *    that I_T nexus, with the additional sense code set to
3218          *    RESERVATIONS RELEASED. If the type or scope have not
3219          *    changed, then no unit attention condition(s) shall be
3220          *    established for this reason.
3221          */
3222         if ((prh_type != type) || (prh_scope != scope)) {
3223                 spin_lock(&pr_tmpl->registration_lock);
3224                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3225                                 &pr_tmpl->registration_list, pr_reg_list) {
3226
3227                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3228                         if (calling_it_nexus)
3229                                 continue;
3230
3231                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3232                                         pr_reg->pr_res_mapped_lun, 0x2A,
3233                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3234                 }
3235                 spin_unlock(&pr_tmpl->registration_lock);
3236         }
3237         spin_unlock(&dev->dev_reservation_lock);
3238         /*
3239          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3240          * All received CDBs for the matching existing reservation and
3241          * registrations undergo ABORT_TASK logic.
3242          *
3243          * From there, core_scsi3_release_preempt_and_abort() will
3244          * release every registration in the list (which have already
3245          * been removed from the primary pr_reg list), except the
3246          * new persistent reservation holder, the calling Initiator Port.
3247          */
3248         if (abort) {
3249                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3250                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3251                                                 pr_reg_n);
3252         }
3253
3254         if (pr_tmpl->pr_aptpl_active) {
3255                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3256                                 &pr_reg_n->pr_aptpl_buf[0],
3257                                 pr_tmpl->pr_aptpl_buf_len);
3258                 if (!ret)
3259                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3260                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3261         }
3262
3263         core_scsi3_put_pr_reg(pr_reg_n);
3264         core_scsi3_pr_generation(cmd->se_dev);
3265         return 0;
3266 }
3267
3268 static int core_scsi3_emulate_pro_preempt(
3269         struct se_cmd *cmd,
3270         int type,
3271         int scope,
3272         u64 res_key,
3273         u64 sa_res_key,
3274         int abort)
3275 {
3276         int ret = 0;
3277
3278         switch (type) {
3279         case PR_TYPE_WRITE_EXCLUSIVE:
3280         case PR_TYPE_EXCLUSIVE_ACCESS:
3281         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3282         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3283         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3284         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3285                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3286                                 res_key, sa_res_key, abort);
3287                 break;
3288         default:
3289                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3290                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3291                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3292         }
3293
3294         return ret;
3295 }
3296
3297
3298 static int core_scsi3_emulate_pro_register_and_move(
3299         struct se_cmd *cmd,
3300         u64 res_key,
3301         u64 sa_res_key,
3302         int aptpl,
3303         int unreg)
3304 {
3305         struct se_session *se_sess = cmd->se_sess;
3306         struct se_device *dev = cmd->se_dev;
3307         struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3308         struct se_lun *se_lun = cmd->se_lun;
3309         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3310         struct se_port *se_port;
3311         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3312         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3313         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3314         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3315         unsigned char *buf;
3316         unsigned char *initiator_str;
3317         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3318         u32 tid_len, tmp_tid_len;
3319         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3320         unsigned short rtpi;
3321         unsigned char proto_ident;
3322
3323         if (!se_sess || !se_lun) {
3324                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3325                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3326         }
3327         memset(dest_iport, 0, 64);
3328         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3329         se_tpg = se_sess->se_tpg;
3330         tf_ops = se_tpg->se_tpg_tfo;
3331         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3332         /*
3333          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3334          *      Register behaviors for a REGISTER AND MOVE service action
3335          *
3336          * Locate the existing *pr_reg via struct se_node_acl pointers
3337          */
3338         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3339                                 se_sess);
3340         if (!pr_reg) {
3341                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3342                         " *pr_reg for REGISTER_AND_MOVE\n");
3343                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3344         }
3345         /*
3346          * The provided reservation key much match the existing reservation key
3347          * provided during this initiator's I_T nexus registration.
3348          */
3349         if (res_key != pr_reg->pr_res_key) {
3350                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3351                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3352                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3353                 core_scsi3_put_pr_reg(pr_reg);
3354                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3355         }
3356         /*
3357          * The service active reservation key needs to be non zero
3358          */
3359         if (!sa_res_key) {
3360                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3361                         " sa_res_key\n");
3362                 core_scsi3_put_pr_reg(pr_reg);
3363                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3364         }
3365
3366         /*
3367          * Determine the Relative Target Port Identifier where the reservation
3368          * will be moved to for the TransportID containing SCSI initiator WWN
3369          * information.
3370          */
3371         buf = transport_kmap_first_data_page(cmd);
3372         rtpi = (buf[18] & 0xff) << 8;
3373         rtpi |= buf[19] & 0xff;
3374         tid_len = (buf[20] & 0xff) << 24;
3375         tid_len |= (buf[21] & 0xff) << 16;
3376         tid_len |= (buf[22] & 0xff) << 8;
3377         tid_len |= buf[23] & 0xff;
3378         transport_kunmap_first_data_page(cmd);
3379         buf = NULL;
3380
3381         if ((tid_len + 24) != cmd->data_length) {
3382                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3383                         " does not equal CDB data_length: %u\n", tid_len,
3384                         cmd->data_length);
3385                 core_scsi3_put_pr_reg(pr_reg);
3386                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3387         }
3388
3389         spin_lock(&dev->se_port_lock);
3390         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3391                 if (se_port->sep_rtpi != rtpi)
3392                         continue;
3393                 dest_se_tpg = se_port->sep_tpg;
3394                 if (!dest_se_tpg)
3395                         continue;
3396                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3397                 if (!dest_tf_ops)
3398                         continue;
3399
3400                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3401                 smp_mb__after_atomic_inc();
3402                 spin_unlock(&dev->se_port_lock);
3403
3404                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3405                 if (ret != 0) {
3406                         pr_err("core_scsi3_tpg_depend_item() failed"
3407                                 " for dest_se_tpg\n");
3408                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3409                         smp_mb__after_atomic_dec();
3410                         core_scsi3_put_pr_reg(pr_reg);
3411                         return PYX_TRANSPORT_LU_COMM_FAILURE;
3412                 }
3413
3414                 spin_lock(&dev->se_port_lock);
3415                 break;
3416         }
3417         spin_unlock(&dev->se_port_lock);
3418
3419         if (!dest_se_tpg || !dest_tf_ops) {
3420                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3421                         " fabric ops from Relative Target Port Identifier:"
3422                         " %hu\n", rtpi);
3423                 core_scsi3_put_pr_reg(pr_reg);
3424                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3425         }
3426
3427         buf = transport_kmap_first_data_page(cmd);
3428         proto_ident = (buf[24] & 0x0f);
3429 #if 0
3430         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3431                         " 0x%02x\n", proto_ident);
3432 #endif
3433         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3434                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3435                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3436                         " from fabric: %s\n", proto_ident,
3437                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3438                         dest_tf_ops->get_fabric_name());
3439                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3440                 goto out;
3441         }
3442         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3443                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3444                         " containg a valid tpg_parse_pr_out_transport_id"
3445                         " function pointer\n");
3446                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3447                 goto out;
3448         }
3449         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3450                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3451         if (!initiator_str) {
3452                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3453                         " initiator_str from Transport ID\n");
3454                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3455                 goto out;
3456         }
3457
3458         transport_kunmap_first_data_page(cmd);
3459         buf = NULL;
3460
3461         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3462                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3463                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3464                 iport_ptr : "");
3465         /*
3466          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3467          * action specifies a TransportID that is the same as the initiator port
3468          * of the I_T nexus for the command received, then the command shall
3469          * be terminated with CHECK CONDITION status, with the sense key set to
3470          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3471          * IN PARAMETER LIST.
3472          */
3473         pr_reg_nacl = pr_reg->pr_reg_nacl;
3474         matching_iname = (!strcmp(initiator_str,
3475                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3476         if (!matching_iname)
3477                 goto after_iport_check;
3478
3479         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3480                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3481                         " matches: %s on received I_T Nexus\n", initiator_str,
3482                         pr_reg_nacl->initiatorname);
3483                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3484                 goto out;
3485         }
3486         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3487                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3488                         " matches: %s %s on received I_T Nexus\n",
3489                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3490                         pr_reg->pr_reg_isid);
3491                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3492                 goto out;
3493         }
3494 after_iport_check:
3495         /*
3496          * Locate the destination struct se_node_acl from the received Transport ID
3497          */
3498         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3499         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3500                                 initiator_str);
3501         if (dest_node_acl) {
3502                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3503                 smp_mb__after_atomic_inc();
3504         }
3505         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3506
3507         if (!dest_node_acl) {
3508                 pr_err("Unable to locate %s dest_node_acl for"
3509                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3510                         initiator_str);
3511                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3512                 goto out;
3513         }
3514         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3515         if (ret != 0) {
3516                 pr_err("core_scsi3_nodeacl_depend_item() for"
3517                         " dest_node_acl\n");
3518                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3519                 smp_mb__after_atomic_dec();
3520                 dest_node_acl = NULL;
3521                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3522                 goto out;
3523         }
3524 #if 0
3525         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3526                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3527                 dest_node_acl->initiatorname);
3528 #endif
3529         /*
3530          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3531          * PORT IDENTIFIER.
3532          */
3533         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3534         if (!dest_se_deve) {
3535                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3536                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3537                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3538                 goto out;
3539         }
3540
3541         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3542         if (ret < 0) {
3543                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3544                 atomic_dec(&dest_se_deve->pr_ref_count);
3545                 smp_mb__after_atomic_dec();
3546                 dest_se_deve = NULL;
3547                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3548                 goto out;
3549         }
3550 #if 0
3551         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3552                 " ACL for dest_se_deve->mapped_lun: %u\n",
3553                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3554                 dest_se_deve->mapped_lun);
3555 #endif
3556         /*
3557          * A persistent reservation needs to already existing in order to
3558          * successfully complete the REGISTER_AND_MOVE service action..
3559          */
3560         spin_lock(&dev->dev_reservation_lock);
3561         pr_res_holder = dev->dev_pr_res_holder;
3562         if (!pr_res_holder) {
3563                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3564                         " currently held\n");
3565                 spin_unlock(&dev->dev_reservation_lock);
3566                 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3567                 goto out;
3568         }
3569         /*
3570          * The received on I_T Nexus must be the reservation holder.
3571          *
3572          * From spc4r17 section 5.7.8  Table 50 --
3573          *      Register behaviors for a REGISTER AND MOVE service action
3574          */
3575         if (pr_res_holder != pr_reg) {
3576                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3577                         " Nexus is not reservation holder\n");
3578                 spin_unlock(&dev->dev_reservation_lock);
3579                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3580                 goto out;
3581         }
3582         /*
3583          * From spc4r17 section 5.7.8: registering and moving reservation
3584          *
3585          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3586          * action is received and the established persistent reservation is a
3587          * Write Exclusive - All Registrants type or Exclusive Access -
3588          * All Registrants type reservation, then the command shall be completed
3589          * with RESERVATION CONFLICT status.
3590          */
3591         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3592             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3593                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3594                         " reservation for type: %s\n",
3595                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3596                 spin_unlock(&dev->dev_reservation_lock);
3597                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3598                 goto out;
3599         }
3600         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3601         /*
3602          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3603          */
3604         type = pr_res_holder->pr_res_type;
3605         scope = pr_res_holder->pr_res_type;
3606         /*
3607          * c) Associate the reservation key specified in the SERVICE ACTION
3608          *    RESERVATION KEY field with the I_T nexus specified as the
3609          *    destination of the register and move, where:
3610          *    A) The I_T nexus is specified by the TransportID and the
3611          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3612          *    B) Regardless of the TransportID format used, the association for
3613          *       the initiator port is based on either the initiator port name
3614          *       (see 3.1.71) on SCSI transport protocols where port names are
3615          *       required or the initiator port identifier (see 3.1.70) on SCSI
3616          *       transport protocols where port names are not required;
3617          * d) Register the reservation key specified in the SERVICE ACTION
3618          *    RESERVATION KEY field;
3619          * e) Retain the reservation key specified in the SERVICE ACTION
3620          *    RESERVATION KEY field and associated information;
3621          *
3622          * Also, It is not an error for a REGISTER AND MOVE service action to
3623          * register an I_T nexus that is already registered with the same
3624          * reservation key or a different reservation key.
3625          */
3626         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3627                                         iport_ptr);
3628         if (!dest_pr_reg) {
3629                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3630                                 dest_node_acl, dest_se_deve, iport_ptr,
3631                                 sa_res_key, 0, aptpl, 2, 1);
3632                 if (ret != 0) {
3633                         spin_unlock(&dev->dev_reservation_lock);
3634                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3635                         goto out;
3636                 }
3637                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3638                                                 iport_ptr);
3639                 new_reg = 1;
3640         }
3641         /*
3642          * f) Release the persistent reservation for the persistent reservation
3643          *    holder (i.e., the I_T nexus on which the
3644          */
3645         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3646                         dev->dev_pr_res_holder, 0);
3647         /*
3648          * g) Move the persistent reservation to the specified I_T nexus using
3649          *    the same scope and type as the persistent reservation released in
3650          *    item f); and
3651          */
3652         dev->dev_pr_res_holder = dest_pr_reg;
3653         dest_pr_reg->pr_res_holder = 1;
3654         dest_pr_reg->pr_res_type = type;
3655         pr_reg->pr_res_scope = scope;
3656         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3657                                 PR_REG_ISID_ID_LEN);
3658         /*
3659          * Increment PRGeneration for existing registrations..
3660          */
3661         if (!new_reg)
3662                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3663         spin_unlock(&dev->dev_reservation_lock);
3664
3665         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3666                 " created new reservation holder TYPE: %s on object RTPI:"
3667                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3668                 core_scsi3_pr_dump_type(type), rtpi,
3669                 dest_pr_reg->pr_res_generation);
3670         pr_debug("SPC-3 PR Successfully moved reservation from"
3671                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3672                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3673                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3674                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3675                 iport_ptr : "");
3676         /*
3677          * It is now safe to release configfs group dependencies for destination
3678          * of Transport ID Initiator Device/Port Identifier
3679          */
3680         core_scsi3_lunacl_undepend_item(dest_se_deve);
3681         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3682         core_scsi3_tpg_undepend_item(dest_se_tpg);
3683         /*
3684          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3685          * nexus on which PERSISTENT RESERVE OUT command was received.
3686          */
3687         if (unreg) {
3688                 spin_lock(&pr_tmpl->registration_lock);
3689                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3690                 spin_unlock(&pr_tmpl->registration_lock);
3691         } else
3692                 core_scsi3_put_pr_reg(pr_reg);
3693
3694         /*
3695          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3696          * write out the updated metadata to struct file for this SCSI device.
3697          */
3698         if (!aptpl) {
3699                 pr_tmpl->pr_aptpl_active = 0;
3700                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3701                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3702                                 " REGISTER_AND_MOVE\n");
3703         } else {
3704                 pr_tmpl->pr_aptpl_active = 1;
3705                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3706                                 &dest_pr_reg->pr_aptpl_buf[0],
3707                                 pr_tmpl->pr_aptpl_buf_len);
3708                 if (!ret)
3709                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3710                                         " REGISTER_AND_MOVE\n");
3711         }
3712
3713         transport_kunmap_first_data_page(cmd);
3714
3715         core_scsi3_put_pr_reg(dest_pr_reg);
3716         return 0;
3717 out:
3718         if (buf)
3719                 transport_kunmap_first_data_page(cmd);
3720         if (dest_se_deve)
3721                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3722         if (dest_node_acl)
3723                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3724         core_scsi3_tpg_undepend_item(dest_se_tpg);
3725         core_scsi3_put_pr_reg(pr_reg);
3726         return ret;
3727 }
3728
3729 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3730 {
3731         unsigned int __v1, __v2;
3732
3733         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3734         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3735
3736         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3737 }
3738
3739 /*
3740  * See spc4r17 section 6.14 Table 170
3741  */
3742 static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
3743 {
3744         unsigned char *buf;
3745         u64 res_key, sa_res_key;
3746         int sa, scope, type, aptpl;
3747         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3748         /*
3749          * FIXME: A NULL struct se_session pointer means an this is not coming from
3750          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3751          */
3752         if (!cmd->se_sess)
3753                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3754
3755         if (cmd->data_length < 24) {
3756                 pr_warn("SPC-PR: Received PR OUT parameter list"
3757                         " length too small: %u\n", cmd->data_length);
3758                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3759         }
3760         /*
3761          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3762          */
3763         sa = (cdb[1] & 0x1f);
3764         scope = (cdb[2] & 0xf0);
3765         type = (cdb[2] & 0x0f);
3766
3767         buf = transport_kmap_first_data_page(cmd);
3768         /*
3769          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3770          */
3771         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3772         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3773         /*
3774          * REGISTER_AND_MOVE uses a different SA parameter list containing
3775          * SCSI TransportIDs.
3776          */
3777         if (sa != PRO_REGISTER_AND_MOVE) {
3778                 spec_i_pt = (buf[20] & 0x08);
3779                 all_tg_pt = (buf[20] & 0x04);
3780                 aptpl = (buf[20] & 0x01);
3781         } else {
3782                 aptpl = (buf[17] & 0x01);
3783                 unreg = (buf[17] & 0x02);
3784         }
3785         transport_kunmap_first_data_page(cmd);
3786         buf = NULL;
3787
3788         /*
3789          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3790          */
3791         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3792                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3793         /*
3794          * From spc4r17 section 6.14:
3795          *
3796          * If the SPEC_I_PT bit is set to zero, the service action is not
3797          * REGISTER AND MOVE, and the parameter list length is not 24, then
3798          * the command shall be terminated with CHECK CONDITION status, with
3799          * the sense key set to ILLEGAL REQUEST, and the additional sense
3800          * code set to PARAMETER LIST LENGTH ERROR.
3801          */
3802         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3803             (cmd->data_length != 24)) {
3804                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3805                         " list length: %u\n", cmd->data_length);
3806                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3807         }
3808         /*
3809          * (core_scsi3_emulate_pro_* function parameters
3810          * are defined by spc4r17 Table 174:
3811          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3812          */
3813         switch (sa) {
3814         case PRO_REGISTER:
3815                 return core_scsi3_emulate_pro_register(cmd,
3816                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3817         case PRO_RESERVE:
3818                 return core_scsi3_emulate_pro_reserve(cmd,
3819                         type, scope, res_key);
3820         case PRO_RELEASE:
3821                 return core_scsi3_emulate_pro_release(cmd,
3822                         type, scope, res_key);
3823         case PRO_CLEAR:
3824                 return core_scsi3_emulate_pro_clear(cmd, res_key);
3825         case PRO_PREEMPT:
3826                 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3827                                         res_key, sa_res_key, 0);
3828         case PRO_PREEMPT_AND_ABORT:
3829                 return core_scsi3_emulate_pro_preempt(cmd, type, scope,
3830                                         res_key, sa_res_key, 1);
3831         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3832                 return core_scsi3_emulate_pro_register(cmd,
3833                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3834         case PRO_REGISTER_AND_MOVE:
3835                 return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3836                                 sa_res_key, aptpl, unreg);
3837         default:
3838                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3839                         " action: 0x%02x\n", cdb[1] & 0x1f);
3840                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3841         }
3842
3843         return PYX_TRANSPORT_INVALID_CDB_FIELD;
3844 }
3845
3846 /*
3847  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3848  *
3849  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3850  */
3851 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3852 {
3853         struct se_device *se_dev = cmd->se_dev;
3854         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3855         struct t10_pr_registration *pr_reg;
3856         unsigned char *buf;
3857         u32 add_len = 0, off = 8;
3858
3859         if (cmd->data_length < 8) {
3860                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3861                         " too small\n", cmd->data_length);
3862                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3863         }
3864
3865         buf = transport_kmap_first_data_page(cmd);
3866         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3867         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3868         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3869         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3870
3871         spin_lock(&su_dev->t10_pr.registration_lock);
3872         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3873                         pr_reg_list) {
3874                 /*
3875                  * Check for overflow of 8byte PRI READ_KEYS payload and
3876                  * next reservation key list descriptor.
3877                  */
3878                 if ((add_len + 8) > (cmd->data_length - 8))
3879                         break;
3880
3881                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3882                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3883                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3884                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3885                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3886                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3887                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3888                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3889
3890                 add_len += 8;
3891         }
3892         spin_unlock(&su_dev->t10_pr.registration_lock);
3893
3894         buf[4] = ((add_len >> 24) & 0xff);
3895         buf[5] = ((add_len >> 16) & 0xff);
3896         buf[6] = ((add_len >> 8) & 0xff);
3897         buf[7] = (add_len & 0xff);
3898
3899         transport_kunmap_first_data_page(cmd);
3900
3901         return 0;
3902 }
3903
3904 /*
3905  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3906  *
3907  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3908  */
3909 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3910 {
3911         struct se_device *se_dev = cmd->se_dev;
3912         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3913         struct t10_pr_registration *pr_reg;
3914         unsigned char *buf;
3915         u64 pr_res_key;
3916         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3917
3918         if (cmd->data_length < 8) {
3919                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3920                         " too small\n", cmd->data_length);
3921                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3922         }
3923
3924         buf = transport_kmap_first_data_page(cmd);
3925         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3926         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3927         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3928         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3929
3930         spin_lock(&se_dev->dev_reservation_lock);
3931         pr_reg = se_dev->dev_pr_res_holder;
3932         if ((pr_reg)) {
3933                 /*
3934                  * Set the hardcoded Additional Length
3935                  */
3936                 buf[4] = ((add_len >> 24) & 0xff);
3937                 buf[5] = ((add_len >> 16) & 0xff);
3938                 buf[6] = ((add_len >> 8) & 0xff);
3939                 buf[7] = (add_len & 0xff);
3940
3941                 if (cmd->data_length < 22)
3942                         goto err;
3943
3944                 /*
3945                  * Set the Reservation key.
3946                  *
3947                  * From spc4r17, section 5.7.10:
3948                  * A persistent reservation holder has its reservation key
3949                  * returned in the parameter data from a PERSISTENT
3950                  * RESERVE IN command with READ RESERVATION service action as
3951                  * follows:
3952                  * a) For a persistent reservation of the type Write Exclusive
3953                  *    - All Registrants or Exclusive Access  All Regitrants,
3954                  *      the reservation key shall be set to zero; or
3955                  * b) For all other persistent reservation types, the
3956                  *    reservation key shall be set to the registered
3957                  *    reservation key for the I_T nexus that holds the
3958                  *    persistent reservation.
3959                  */
3960                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3961                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3962                         pr_res_key = 0;
3963                 else
3964                         pr_res_key = pr_reg->pr_res_key;
3965
3966                 buf[8] = ((pr_res_key >> 56) & 0xff);
3967                 buf[9] = ((pr_res_key >> 48) & 0xff);
3968                 buf[10] = ((pr_res_key >> 40) & 0xff);
3969                 buf[11] = ((pr_res_key >> 32) & 0xff);
3970                 buf[12] = ((pr_res_key >> 24) & 0xff);
3971                 buf[13] = ((pr_res_key >> 16) & 0xff);
3972                 buf[14] = ((pr_res_key >> 8) & 0xff);
3973                 buf[15] = (pr_res_key & 0xff);
3974                 /*
3975                  * Set the SCOPE and TYPE
3976                  */
3977                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3978                           (pr_reg->pr_res_type & 0x0f);
3979         }
3980
3981 err:
3982         spin_unlock(&se_dev->dev_reservation_lock);
3983         transport_kunmap_first_data_page(cmd);
3984
3985         return 0;
3986 }
3987
3988 /*
3989  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3990  *
3991  * See spc4r17 section 6.13.4 Table 165
3992  */
3993 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3994 {
3995         struct se_device *dev = cmd->se_dev;
3996         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3997         unsigned char *buf;
3998         u16 add_len = 8; /* Hardcoded to 8. */
3999
4000         if (cmd->data_length < 6) {
4001                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4002                         " %u too small\n", cmd->data_length);
4003                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4004         }
4005
4006         buf = transport_kmap_first_data_page(cmd);
4007
4008         buf[0] = ((add_len << 8) & 0xff);
4009         buf[1] = (add_len & 0xff);
4010         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4011         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4012         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4013         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4014         /*
4015          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4016          * set the TMV: Task Mask Valid bit.
4017          */
4018         buf[3] |= 0x80;
4019         /*
4020          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4021          */
4022         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4023         /*
4024          * PTPL_A: Persistence across Target Power Loss Active bit
4025          */
4026         if (pr_tmpl->pr_aptpl_active)
4027                 buf[3] |= 0x01;
4028         /*
4029          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4030          */
4031         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4032         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4033         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4034         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4035         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4036         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4037
4038         transport_kunmap_first_data_page(cmd);
4039
4040         return 0;
4041 }
4042
4043 /*
4044  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4045  *
4046  * See spc4r17 section 6.13.5 Table 168 and 169
4047  */
4048 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4049 {
4050         struct se_device *se_dev = cmd->se_dev;
4051         struct se_node_acl *se_nacl;
4052         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4053         struct se_portal_group *se_tpg;
4054         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4055         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4056         unsigned char *buf;
4057         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4058         u32 off = 8; /* off into first Full Status descriptor */
4059         int format_code = 0;
4060
4061         if (cmd->data_length < 8) {
4062                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4063                         " too small\n", cmd->data_length);
4064                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4065         }
4066
4067         buf = transport_kmap_first_data_page(cmd);
4068
4069         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4070         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4071         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4072         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4073
4074         spin_lock(&pr_tmpl->registration_lock);
4075         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4076                         &pr_tmpl->registration_list, pr_reg_list) {
4077
4078                 se_nacl = pr_reg->pr_reg_nacl;
4079                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4080                 add_desc_len = 0;
4081
4082                 atomic_inc(&pr_reg->pr_res_holders);
4083                 smp_mb__after_atomic_inc();
4084                 spin_unlock(&pr_tmpl->registration_lock);
4085                 /*
4086                  * Determine expected length of $FABRIC_MOD specific
4087                  * TransportID full status descriptor..
4088                  */
4089                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4090                                 se_tpg, se_nacl, pr_reg, &format_code);
4091
4092                 if ((exp_desc_len + add_len) > cmd->data_length) {
4093                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4094                                 " out of buffer: %d\n", cmd->data_length);
4095                         spin_lock(&pr_tmpl->registration_lock);
4096                         atomic_dec(&pr_reg->pr_res_holders);
4097                         smp_mb__after_atomic_dec();
4098                         break;
4099                 }
4100                 /*
4101                  * Set RESERVATION KEY
4102                  */
4103                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4104                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4105                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4106                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4107                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4108                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4109                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4110                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4111                 off += 4; /* Skip Over Reserved area */
4112
4113                 /*
4114                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4115                  */
4116                 if (pr_reg->pr_reg_all_tg_pt)
4117                         buf[off] = 0x02;
4118                 /*
4119                  * The struct se_lun pointer will be present for the
4120                  * reservation holder for PR_HOLDER bit.
4121                  *
4122                  * Also, if this registration is the reservation
4123                  * holder, fill in SCOPE and TYPE in the next byte.
4124                  */
4125                 if (pr_reg->pr_res_holder) {
4126                         buf[off++] |= 0x01;
4127                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4128                                      (pr_reg->pr_res_type & 0x0f);
4129                 } else
4130                         off += 2;
4131
4132                 off += 4; /* Skip over reserved area */
4133                 /*
4134                  * From spc4r17 6.3.15:
4135                  *
4136                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4137                  * IDENTIFIER field contains the relative port identifier (see
4138                  * 3.1.120) of the target port that is part of the I_T nexus
4139                  * described by this full status descriptor. If the ALL_TG_PT
4140                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4141                  * IDENTIFIER field are not defined by this standard.
4142                  */
4143                 if (!pr_reg->pr_reg_all_tg_pt) {
4144                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4145
4146                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4147                         buf[off++] = (port->sep_rtpi & 0xff);
4148                 } else
4149                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4150
4151                 /*
4152                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4153                  */
4154                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4155                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4156
4157                 spin_lock(&pr_tmpl->registration_lock);
4158                 atomic_dec(&pr_reg->pr_res_holders);
4159                 smp_mb__after_atomic_dec();
4160                 /*
4161                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4162                  */
4163                 buf[off++] = ((desc_len >> 24) & 0xff);
4164                 buf[off++] = ((desc_len >> 16) & 0xff);
4165                 buf[off++] = ((desc_len >> 8) & 0xff);
4166                 buf[off++] = (desc_len & 0xff);
4167                 /*
4168                  * Size of full desctipor header minus TransportID
4169                  * containing $FABRIC_MOD specific) initiator device/port
4170                  * WWN information.
4171                  *
4172                  *  See spc4r17 Section 6.13.5 Table 169
4173                  */
4174                 add_desc_len = (24 + desc_len);
4175
4176                 off += desc_len;
4177                 add_len += add_desc_len;
4178         }
4179         spin_unlock(&pr_tmpl->registration_lock);
4180         /*
4181          * Set ADDITIONAL_LENGTH
4182          */
4183         buf[4] = ((add_len >> 24) & 0xff);
4184         buf[5] = ((add_len >> 16) & 0xff);
4185         buf[6] = ((add_len >> 8) & 0xff);
4186         buf[7] = (add_len & 0xff);
4187
4188         transport_kunmap_first_data_page(cmd);
4189
4190         return 0;
4191 }
4192
4193 static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
4194 {
4195         switch (cdb[1] & 0x1f) {
4196         case PRI_READ_KEYS:
4197                 return core_scsi3_pri_read_keys(cmd);
4198         case PRI_READ_RESERVATION:
4199                 return core_scsi3_pri_read_reservation(cmd);
4200         case PRI_REPORT_CAPABILITIES:
4201                 return core_scsi3_pri_report_capabilities(cmd);
4202         case PRI_READ_FULL_STATUS:
4203                 return core_scsi3_pri_read_full_status(cmd);
4204         default:
4205                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4206                         " action: 0x%02x\n", cdb[1] & 0x1f);
4207                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4208         }
4209
4210 }
4211
4212 int core_scsi3_emulate_pr(struct se_cmd *cmd)
4213 {
4214         unsigned char *cdb = &cmd->t_task_cdb[0];
4215         struct se_device *dev = cmd->se_dev;
4216         /*
4217          * Following spc2r20 5.5.1 Reservations overview:
4218          *
4219          * If a logical unit has been reserved by any RESERVE command and is
4220          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4221          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4222          * initiator or service action and shall terminate with a RESERVATION
4223          * CONFLICT status.
4224          */
4225         if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
4226                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4227                         " SPC-2 reservation is held, returning"
4228                         " RESERVATION_CONFLICT\n");
4229                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4230         }
4231
4232         return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
4233                core_scsi3_emulate_pr_out(cmd, cdb) :
4234                core_scsi3_emulate_pr_in(cmd, cdb);
4235 }
4236
4237 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4238 {
4239         return 0;
4240 }
4241
4242 static int core_pt_seq_non_holder(
4243         struct se_cmd *cmd,
4244         unsigned char *cdb,
4245         u32 pr_reg_type)
4246 {
4247         return 0;
4248 }
4249
4250 int core_setup_reservations(struct se_device *dev, int force_pt)
4251 {
4252         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4253         struct t10_reservation *rest = &su_dev->t10_pr;
4254         /*
4255          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4256          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4257          * cause a problem because libata and some SATA RAID HBAs appear
4258          * under Linux/SCSI, but to emulate reservations themselves.
4259          */
4260         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4261             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4262                 rest->res_type = SPC_PASSTHROUGH;
4263                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4264                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4265                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4266                         " emulation\n", dev->transport->name);
4267                 return 0;
4268         }
4269         /*
4270          * If SPC-3 or above is reported by real or emulated struct se_device,
4271          * use emulated Persistent Reservations.
4272          */
4273         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4274                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4275                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4276                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4277                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4278                         " emulation\n", dev->transport->name);
4279         } else {
4280                 rest->res_type = SPC2_RESERVATIONS;
4281                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4282                 rest->pr_ops.t10_seq_non_holder =
4283                                 &core_scsi2_reservation_seq_non_holder;
4284                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4285                         dev->transport->name);
4286         }
4287
4288         return 0;
4289 }