drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * (c) Copyright 2009-2012 RisingTide Systems LLC.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/slab.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/file.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_pr.h"
  42 #include "target_core_ua.h"
  43
  44 /*
  45  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  46  */
  47 struct pr_transport_id_holder {
  48         int dest_local_nexus;
  49         struct t10_pr_registration *dest_pr_reg;
  50         struct se_portal_group *dest_tpg;
  51         struct se_node_acl *dest_node_acl;
  52         struct se_dev_entry *dest_se_deve;
  53         struct list_head dest_list;
  54 };
  55
  56 void core_pr_dump_initiator_port(
  57         struct t10_pr_registration *pr_reg,
  58         char *buf,
  59         u32 size)
  60 {
  61         if (!pr_reg->isid_present_at_reg)
  62                 buf[0] = '\0';
  63
  64         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  65 }
  66
  67 enum register_type {
  68         REGISTER,
  69         REGISTER_AND_IGNORE_EXISTING_KEY,
  70         REGISTER_AND_MOVE,
  71 };
  72
  73 enum preempt_type {
  74         PREEMPT,
  75         PREEMPT_AND_ABORT,
  76 };
  77
  78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  79                         struct t10_pr_registration *, int);
  80
  81 static sense_reason_t
  82 target_scsi2_reservation_check(struct se_cmd *cmd)
  83 {
  84         struct se_device *dev = cmd->se_dev;
  85         struct se_session *sess = cmd->se_sess;
  86
  87         switch (cmd->t_task_cdb[0]) {
  88         case INQUIRY:
  89         case RELEASE:
  90         case RELEASE_10:
  91                 return 0;
  92         default:
  93                 break;
  94         }
  95
  96         if (!dev->dev_reserved_node_acl || !sess)
  97                 return 0;
  98
  99         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 100                 return TCM_RESERVATION_CONFLICT;
 101
 102         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 103                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 104                         return TCM_RESERVATION_CONFLICT;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 111                                         struct se_node_acl *, struct se_session *);
 112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 113
 114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 115 {
 116         struct se_session *se_sess = cmd->se_sess;
 117         struct se_device *dev = cmd->se_dev;
 118         struct t10_pr_registration *pr_reg;
 119         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 120         int conflict = 0;
 121
 122         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 123                         se_sess);
 124         if (pr_reg) {
 125                 /*
 126                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 127                  * behavior
 128                  *
 129                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 130                  * status, but no reservation shall be established and the
 131                  * persistent reservation shall not be changed, if the command
 132                  * is received from a) and b) below.
 133                  *
 134                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 135                  * status, but the persistent reservation shall not be released,
 136                  * if the command is received from a) and b)
 137                  *
 138                  * a) An I_T nexus that is a persistent reservation holder; or
 139                  * b) An I_T nexus that is registered if a registrants only or
 140                  *    all registrants type persistent reservation is present.
 141                  *
 142                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 143                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 144                  * as defined in SPC-2.
 145                  */
 146                 if (pr_reg->pr_res_holder) {
 147                         core_scsi3_put_pr_reg(pr_reg);
 148                         return 1;
 149                 }
 150                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 151                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 152                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 153                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 154                         core_scsi3_put_pr_reg(pr_reg);
 155                         return 1;
 156                 }
 157                 core_scsi3_put_pr_reg(pr_reg);
 158                 conflict = 1;
 159         } else {
 160                 /*
 161                  * Following spc2r20 5.5.1 Reservations overview:
 162                  *
 163                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 164                  * command with the REGISTER or the REGISTER AND IGNORE
 165                  * EXISTING KEY service action and is still registered by any
 166                  * initiator, all RESERVE commands and all RELEASE commands
 167                  * regardless of initiator shall conflict and shall terminate
 168                  * with a RESERVATION CONFLICT status.
 169                  */
 170                 spin_lock(&pr_tmpl->registration_lock);
 171                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 172                 spin_unlock(&pr_tmpl->registration_lock);
 173         }
 174
 175         if (conflict) {
 176                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 177                         " while active SPC-3 registrations exist,"
 178                         " returning RESERVATION_CONFLICT\n");
 179                 return -EBUSY;
 180         }
 181
 182         return 0;
 183 }
 184
 185 sense_reason_t
 186 target_scsi2_reservation_release(struct se_cmd *cmd)
 187 {
 188         struct se_device *dev = cmd->se_dev;
 189         struct se_session *sess = cmd->se_sess;
 190         struct se_portal_group *tpg;
 191         int rc;
 192
 193         if (!sess || !sess->se_tpg)
 194                 goto out;
 195         rc = target_check_scsi2_reservation_conflict(cmd);
 196         if (rc == 1)
 197                 goto out;
 198         if (rc < 0)
 199                 return TCM_RESERVATION_CONFLICT;
 200
 201         spin_lock(&dev->dev_reservation_lock);
 202         if (!dev->dev_reserved_node_acl || !sess)
 203                 goto out_unlock;
 204
 205         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 206                 goto out_unlock;
 207
 208         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 209                 goto out_unlock;
 210
 211         dev->dev_reserved_node_acl = NULL;
 212         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 213         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 214                 dev->dev_res_bin_isid = 0;
 215                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 216         }
 217         tpg = sess->se_tpg;
 218         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 219                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 220                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 221                 sess->se_node_acl->initiatorname);
 222
 223 out_unlock:
 224         spin_unlock(&dev->dev_reservation_lock);
 225 out:
 226         target_complete_cmd(cmd, GOOD);
 227         return 0;
 228 }
 229
 230 sense_reason_t
 231 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 232 {
 233         struct se_device *dev = cmd->se_dev;
 234         struct se_session *sess = cmd->se_sess;
 235         struct se_portal_group *tpg;
 236         sense_reason_t ret = 0;
 237         int rc;
 238
 239         if ((cmd->t_task_cdb[1] & 0x01) &&
 240             (cmd->t_task_cdb[1] & 0x02)) {
 241                 pr_err("LongIO and Obselete Bits set, returning"
 242                                 " ILLEGAL_REQUEST\n");
 243                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 244         }
 245         /*
 246          * This is currently the case for target_core_mod passthrough struct se_cmd
 247          * ops
 248          */
 249         if (!sess || !sess->se_tpg)
 250                 goto out;
 251         rc = target_check_scsi2_reservation_conflict(cmd);
 252         if (rc == 1)
 253                 goto out;
 254
 255         if (rc < 0)
 256                 return TCM_RESERVATION_CONFLICT;
 257
 258         tpg = sess->se_tpg;
 259         spin_lock(&dev->dev_reservation_lock);
 260         if (dev->dev_reserved_node_acl &&
 261            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 262                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 263                         tpg->se_tpg_tfo->get_fabric_name());
 264                 pr_err("Original reserver LUN: %u %s\n",
 265                         cmd->se_lun->unpacked_lun,
 266                         dev->dev_reserved_node_acl->initiatorname);
 267                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 268                         " from %s \n", cmd->se_lun->unpacked_lun,
 269                         cmd->se_deve->mapped_lun,
 270                         sess->se_node_acl->initiatorname);
 271                 ret = TCM_RESERVATION_CONFLICT;
 272                 goto out_unlock;
 273         }
 274
 275         dev->dev_reserved_node_acl = sess->se_node_acl;
 276         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 277         if (sess->sess_bin_isid != 0) {
 278                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 279                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 280         }
 281         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 282                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 283                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 284                 sess->se_node_acl->initiatorname);
 285
 286 out_unlock:
 287         spin_unlock(&dev->dev_reservation_lock);
 288 out:
 289         if (!ret)
 290                 target_complete_cmd(cmd, GOOD);
 291         return ret;
 292 }
 293
 294
 295 /*
 296  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 297  *
 298  * This function is called by those initiator ports who are *NOT*
 299  * the active PR reservation holder when a reservation is present.
 300  */
 301 static int core_scsi3_pr_seq_non_holder(
 302         struct se_cmd *cmd,
 303         u32 pr_reg_type)
 304 {
 305         unsigned char *cdb = cmd->t_task_cdb;
 306         struct se_dev_entry *se_deve;
 307         struct se_session *se_sess = cmd->se_sess;
 308         int other_cdb = 0, ignore_reg;
 309         int registered_nexus = 0, ret = 1; /* Conflict by default */
 310         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 311         int we = 0; /* Write Exclusive */
 312         int legacy = 0; /* Act like a legacy device and return
 313                          * RESERVATION CONFLICT on some CDBs */
 314
 315         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 316         /*
 317          * Determine if the registration should be ignored due to
 318          * non-matching ISIDs in target_scsi3_pr_reservation_check().
 319          */
 320         ignore_reg = (pr_reg_type & 0x80000000);
 321         if (ignore_reg)
 322                 pr_reg_type &= ~0x80000000;
 323
 324         switch (pr_reg_type) {
 325         case PR_TYPE_WRITE_EXCLUSIVE:
 326                 we = 1;
 327         case PR_TYPE_EXCLUSIVE_ACCESS:
 328                 /*
 329                  * Some commands are only allowed for the persistent reservation
 330                  * holder.
 331                  */
 332                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 333                         registered_nexus = 1;
 334                 break;
 335         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 336                 we = 1;
 337         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 338                 /*
 339                  * Some commands are only allowed for registered I_T Nexuses.
 340                  */
 341                 reg_only = 1;
 342                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 343                         registered_nexus = 1;
 344                 break;
 345         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 346                 we = 1;
 347         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 348                 /*
 349                  * Each registered I_T Nexus is a reservation holder.
 350                  */
 351                 all_reg = 1;
 352                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 353                         registered_nexus = 1;
 354                 break;
 355         default:
 356                 return -EINVAL;
 357         }
 358         /*
 359          * Referenced from spc4r17 table 45 for *NON* PR holder access
 360          */
 361         switch (cdb[0]) {
 362         case SECURITY_PROTOCOL_IN:
 363                 if (registered_nexus)
 364                         return 0;
 365                 ret = (we) ? 0 : 1;
 366                 break;
 367         case MODE_SENSE:
 368         case MODE_SENSE_10:
 369         case READ_ATTRIBUTE:
 370         case READ_BUFFER:
 371         case RECEIVE_DIAGNOSTIC:
 372                 if (legacy) {
 373                         ret = 1;
 374                         break;
 375                 }
 376                 if (registered_nexus) {
 377                         ret = 0;
 378                         break;
 379                 }
 380                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 381                 break;
 382         case PERSISTENT_RESERVE_OUT:
 383                 /*
 384                  * This follows PERSISTENT_RESERVE_OUT service actions that
 385                  * are allowed in the presence of various reservations.
 386                  * See spc4r17, table 46
 387                  */
 388                 switch (cdb[1] & 0x1f) {
 389                 case PRO_CLEAR:
 390                 case PRO_PREEMPT:
 391                 case PRO_PREEMPT_AND_ABORT:
 392                         ret = (registered_nexus) ? 0 : 1;
 393                         break;
 394                 case PRO_REGISTER:
 395                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 396                         ret = 0;
 397                         break;
 398                 case PRO_REGISTER_AND_MOVE:
 399                 case PRO_RESERVE:
 400                         ret = 1;
 401                         break;
 402                 case PRO_RELEASE:
 403                         ret = (registered_nexus) ? 0 : 1;
 404                         break;
 405                 default:
 406                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 407                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 408                         return -EINVAL;
 409                 }
 410                 break;
 411         case RELEASE:
 412         case RELEASE_10:
 413                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 414                 ret = 0;
 415                 break;
 416         case RESERVE:
 417         case RESERVE_10:
 418                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 419                 ret = 0;
 420                 break;
 421         case TEST_UNIT_READY:
 422                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 423                 break;
 424         case MAINTENANCE_IN:
 425                 switch (cdb[1] & 0x1f) {
 426                 case MI_MANAGEMENT_PROTOCOL_IN:
 427                         if (registered_nexus) {
 428                                 ret = 0;
 429                                 break;
 430                         }
 431                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 432                         break;
 433                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 434                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 435                         if (legacy) {
 436                                 ret = 1;
 437                                 break;
 438                         }
 439                         if (registered_nexus) {
 440                                 ret = 0;
 441                                 break;
 442                         }
 443                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 444                         break;
 445                 case MI_REPORT_ALIASES:
 446                 case MI_REPORT_IDENTIFYING_INFORMATION:
 447                 case MI_REPORT_PRIORITY:
 448                 case MI_REPORT_TARGET_PGS:
 449                 case MI_REPORT_TIMESTAMP:
 450                         ret = 0; /* Allowed */
 451                         break;
 452                 default:
 453                         pr_err("Unknown MI Service Action: 0x%02x\n",
 454                                 (cdb[1] & 0x1f));
 455                         return -EINVAL;
 456                 }
 457                 break;
 458         case ACCESS_CONTROL_IN:
 459         case ACCESS_CONTROL_OUT:
 460         case INQUIRY:
 461         case LOG_SENSE:
 462         case READ_MEDIA_SERIAL_NUMBER:
 463         case REPORT_LUNS:
 464         case REQUEST_SENSE:
 465         case PERSISTENT_RESERVE_IN:
 466                 ret = 0; /*/ Allowed CDBs */
 467                 break;
 468         default:
 469                 other_cdb = 1;
 470                 break;
 471         }
 472         /*
 473          * Case where the CDB is explicitly allowed in the above switch
 474          * statement.
 475          */
 476         if (!ret && !other_cdb) {
 477                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 478                         " reservation holder\n", cdb[0],
 479                         core_scsi3_pr_dump_type(pr_reg_type));
 480
 481                 return ret;
 482         }
 483         /*
 484          * Check if write exclusive initiator ports *NOT* holding the
 485          * WRITE_EXCLUSIVE_* reservation.
 486          */
 487         if (we && !registered_nexus) {
 488                 if (cmd->data_direction == DMA_TO_DEVICE) {
 489                         /*
 490                          * Conflict for write exclusive
 491                          */
 492                         pr_debug("%s Conflict for unregistered nexus"
 493                                 " %s CDB: 0x%02x to %s reservation\n",
 494                                 transport_dump_cmd_direction(cmd),
 495                                 se_sess->se_node_acl->initiatorname, cdb[0],
 496                                 core_scsi3_pr_dump_type(pr_reg_type));
 497                         return 1;
 498                 } else {
 499                         /*
 500                          * Allow non WRITE CDBs for all Write Exclusive
 501                          * PR TYPEs to pass for registered and
 502                          * non-registered_nexuxes NOT holding the reservation.
 503                          *
 504                          * We only make noise for the unregisterd nexuses,
 505                          * as we expect registered non-reservation holding
 506                          * nexuses to issue CDBs.
 507                          */
 508
 509                         if (!registered_nexus) {
 510                                 pr_debug("Allowing implict CDB: 0x%02x"
 511                                         " for %s reservation on unregistered"
 512                                         " nexus\n", cdb[0],
 513                                         core_scsi3_pr_dump_type(pr_reg_type));
 514                         }
 515
 516                         return 0;
 517                 }
 518         } else if ((reg_only) || (all_reg)) {
 519                 if (registered_nexus) {
 520                         /*
 521                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 522                          * allow commands from registered nexuses.
 523                          */
 524
 525                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 526                                 " reservation\n", cdb[0],
 527                                 core_scsi3_pr_dump_type(pr_reg_type));
 528
 529                         return 0;
 530                 }
 531         }
 532         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 533                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 534                 (registered_nexus) ? "" : "un",
 535                 se_sess->se_node_acl->initiatorname, cdb[0],
 536                 core_scsi3_pr_dump_type(pr_reg_type));
 537
 538         return 1; /* Conflict by default */
 539 }
 540
 541 static sense_reason_t
 542 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 543 {
 544         struct se_device *dev = cmd->se_dev;
 545         struct se_session *sess = cmd->se_sess;
 546         u32 pr_reg_type;
 547
 548         if (!dev->dev_pr_res_holder)
 549                 return 0;
 550
 551         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 552         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 553         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 554                 goto check_nonholder;
 555
 556         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 557                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 558                     sess->sess_bin_isid) {
 559                         pr_reg_type |= 0x80000000;
 560                         goto check_nonholder;
 561                 }
 562         }
 563
 564         return 0;
 565
 566 check_nonholder:
 567         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
 568                 return TCM_RESERVATION_CONFLICT;
 569         return 0;
 570 }
 571
 572 static u32 core_scsi3_pr_generation(struct se_device *dev)
 573 {
 574         u32 prg;
 575
 576         /*
 577          * PRGeneration field shall contain the value of a 32-bit wrapping
 578          * counter mainted by the device server.
 579          *
 580          * Note that this is done regardless of Active Persist across
 581          * Target PowerLoss (APTPL)
 582          *
 583          * See spc4r17 section 6.3.12 READ_KEYS service action
 584          */
 585         spin_lock(&dev->dev_reservation_lock);
 586         prg = dev->t10_pr.pr_generation++;
 587         spin_unlock(&dev->dev_reservation_lock);
 588
 589         return prg;
 590 }
 591
 592 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 593         struct se_device *dev,
 594         struct se_node_acl *nacl,
 595         struct se_dev_entry *deve,
 596         unsigned char *isid,
 597         u64 sa_res_key,
 598         int all_tg_pt,
 599         int aptpl)
 600 {
 601         struct t10_pr_registration *pr_reg;
 602
 603         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 604         if (!pr_reg) {
 605                 pr_err("Unable to allocate struct t10_pr_registration\n");
 606                 return NULL;
 607         }
 608
 609         pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len,
 610                                         GFP_ATOMIC);
 611         if (!pr_reg->pr_aptpl_buf) {
 612                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 613                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 614                 return NULL;
 615         }
 616
 617         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 618         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 619         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 620         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 621         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 622         atomic_set(&pr_reg->pr_res_holders, 0);
 623         pr_reg->pr_reg_nacl = nacl;
 624         pr_reg->pr_reg_deve = deve;
 625         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 626         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 627         pr_reg->pr_res_key = sa_res_key;
 628         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 629         pr_reg->pr_reg_aptpl = aptpl;
 630         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 631         /*
 632          * If an ISID value for this SCSI Initiator Port exists,
 633          * save it to the registration now.
 634          */
 635         if (isid != NULL) {
 636                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 637                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 638                 pr_reg->isid_present_at_reg = 1;
 639         }
 640
 641         return pr_reg;
 642 }
 643
 644 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 645 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 646
 647 /*
 648  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 649  * modes.
 650  */
 651 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 652         struct se_device *dev,
 653         struct se_node_acl *nacl,
 654         struct se_dev_entry *deve,
 655         unsigned char *isid,
 656         u64 sa_res_key,
 657         int all_tg_pt,
 658         int aptpl)
 659 {
 660         struct se_dev_entry *deve_tmp;
 661         struct se_node_acl *nacl_tmp;
 662         struct se_port *port, *port_tmp;
 663         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 664         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 665         int ret;
 666         /*
 667          * Create a registration for the I_T Nexus upon which the
 668          * PROUT REGISTER was received.
 669          */
 670         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 671                         sa_res_key, all_tg_pt, aptpl);
 672         if (!pr_reg)
 673                 return NULL;
 674         /*
 675          * Return pointer to pr_reg for ALL_TG_PT=0
 676          */
 677         if (!all_tg_pt)
 678                 return pr_reg;
 679         /*
 680          * Create list of matching SCSI Initiator Port registrations
 681          * for ALL_TG_PT=1
 682          */
 683         spin_lock(&dev->se_port_lock);
 684         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 685                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 686                 smp_mb__after_atomic_inc();
 687                 spin_unlock(&dev->se_port_lock);
 688
 689                 spin_lock_bh(&port->sep_alua_lock);
 690                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 691                                         alua_port_list) {
 692                         /*
 693                          * This pointer will be NULL for demo mode MappedLUNs
 694                          * that have not been make explict via a ConfigFS
 695                          * MappedLUN group for the SCSI Initiator Node ACL.
 696                          */
 697                         if (!deve_tmp->se_lun_acl)
 698                                 continue;
 699
 700                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 701                         /*
 702                          * Skip the matching struct se_node_acl that is allocated
 703                          * above..
 704                          */
 705                         if (nacl == nacl_tmp)
 706                                 continue;
 707                         /*
 708                          * Only perform PR registrations for target ports on
 709                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 710                          * arrived.
 711                          */
 712                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 713                                 continue;
 714                         /*
 715                          * Look for a matching Initiator Node ACL in ASCII format
 716                          */
 717                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 718                                 continue;
 719
 720                         atomic_inc(&deve_tmp->pr_ref_count);
 721                         smp_mb__after_atomic_inc();
 722                         spin_unlock_bh(&port->sep_alua_lock);
 723                         /*
 724                          * Grab a configfs group dependency that is released
 725                          * for the exception path at label out: below, or upon
 726                          * completion of adding ALL_TG_PT=1 registrations in
 727                          * __core_scsi3_add_registration()
 728                          */
 729                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 730                         if (ret < 0) {
 731                                 pr_err("core_scsi3_lunacl_depend"
 732                                                 "_item() failed\n");
 733                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 734                                 smp_mb__after_atomic_dec();
 735                                 atomic_dec(&deve_tmp->pr_ref_count);
 736                                 smp_mb__after_atomic_dec();
 737                                 goto out;
 738                         }
 739                         /*
 740                          * Located a matching SCSI Initiator Port on a different
 741                          * port, allocate the pr_reg_atp and attach it to the
 742                          * pr_reg->pr_reg_atp_list that will be processed once
 743                          * the original *pr_reg is processed in
 744                          * __core_scsi3_add_registration()
 745                          */
 746                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 747                                                 nacl_tmp, deve_tmp, NULL,
 748                                                 sa_res_key, all_tg_pt, aptpl);
 749                         if (!pr_reg_atp) {
 750                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 751                                 smp_mb__after_atomic_dec();
 752                                 atomic_dec(&deve_tmp->pr_ref_count);
 753                                 smp_mb__after_atomic_dec();
 754                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 755                                 goto out;
 756                         }
 757
 758                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 759                                       &pr_reg->pr_reg_atp_list);
 760                         spin_lock_bh(&port->sep_alua_lock);
 761                 }
 762                 spin_unlock_bh(&port->sep_alua_lock);
 763
 764                 spin_lock(&dev->se_port_lock);
 765                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 766                 smp_mb__after_atomic_dec();
 767         }
 768         spin_unlock(&dev->se_port_lock);
 769
 770         return pr_reg;
 771 out:
 772         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 773                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 774                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 775                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 776                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 777         }
 778         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 779         return NULL;
 780 }
 781
 782 int core_scsi3_alloc_aptpl_registration(
 783         struct t10_reservation *pr_tmpl,
 784         u64 sa_res_key,
 785         unsigned char *i_port,
 786         unsigned char *isid,
 787         u32 mapped_lun,
 788         unsigned char *t_port,
 789         u16 tpgt,
 790         u32 target_lun,
 791         int res_holder,
 792         int all_tg_pt,
 793         u8 type)
 794 {
 795         struct t10_pr_registration *pr_reg;
 796
 797         if (!i_port || !t_port || !sa_res_key) {
 798                 pr_err("Illegal parameters for APTPL registration\n");
 799                 return -EINVAL;
 800         }
 801
 802         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 803         if (!pr_reg) {
 804                 pr_err("Unable to allocate struct t10_pr_registration\n");
 805                 return -ENOMEM;
 806         }
 807         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 808
 809         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 810         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 811         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 812         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 813         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 814         atomic_set(&pr_reg->pr_res_holders, 0);
 815         pr_reg->pr_reg_nacl = NULL;
 816         pr_reg->pr_reg_deve = NULL;
 817         pr_reg->pr_res_mapped_lun = mapped_lun;
 818         pr_reg->pr_aptpl_target_lun = target_lun;
 819         pr_reg->pr_res_key = sa_res_key;
 820         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 821         pr_reg->pr_reg_aptpl = 1;
 822         pr_reg->pr_reg_tg_pt_lun = NULL;
 823         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 824         pr_reg->pr_res_type = type;
 825         /*
 826          * If an ISID value had been saved in APTPL metadata for this
 827          * SCSI Initiator Port, restore it now.
 828          */
 829         if (isid != NULL) {
 830                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 831                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 832                 pr_reg->isid_present_at_reg = 1;
 833         }
 834         /*
 835          * Copy the i_port and t_port information from caller.
 836          */
 837         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 838         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 839         pr_reg->pr_reg_tpgt = tpgt;
 840         /*
 841          * Set pr_res_holder from caller, the pr_reg who is the reservation
 842          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 843          * the Initiator Node LUN ACL from the fabric module is created for
 844          * this registration.
 845          */
 846         pr_reg->pr_res_holder = res_holder;
 847
 848         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 849         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 850                         " metadata\n", (res_holder) ? "+reservation" : "");
 851         return 0;
 852 }
 853
 854 static void core_scsi3_aptpl_reserve(
 855         struct se_device *dev,
 856         struct se_portal_group *tpg,
 857         struct se_node_acl *node_acl,
 858         struct t10_pr_registration *pr_reg)
 859 {
 860         char i_buf[PR_REG_ISID_ID_LEN];
 861
 862         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 863         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 864
 865         spin_lock(&dev->dev_reservation_lock);
 866         dev->dev_pr_res_holder = pr_reg;
 867         spin_unlock(&dev->dev_reservation_lock);
 868
 869         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 870                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 871                 tpg->se_tpg_tfo->get_fabric_name(),
 872                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 873                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 874         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 875                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 876                 i_buf);
 877 }
 878
 879 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 880                                 struct t10_pr_registration *, enum register_type, int);
 881
 882 static int __core_scsi3_check_aptpl_registration(
 883         struct se_device *dev,
 884         struct se_portal_group *tpg,
 885         struct se_lun *lun,
 886         u32 target_lun,
 887         struct se_node_acl *nacl,
 888         struct se_dev_entry *deve)
 889 {
 890         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 891         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 892         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 893         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 894         u16 tpgt;
 895
 896         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 897         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 898         /*
 899          * Copy Initiator Port information from struct se_node_acl
 900          */
 901         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 902         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 903                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 904         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 905         /*
 906          * Look for the matching registrations+reservation from those
 907          * created from APTPL metadata.  Note that multiple registrations
 908          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 909          * TransportIDs.
 910          */
 911         spin_lock(&pr_tmpl->aptpl_reg_lock);
 912         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 913                                 pr_reg_aptpl_list) {
 914                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 915                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 916                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 917                      (pr_reg->pr_reg_tpgt == tpgt) &&
 918                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 919
 920                         pr_reg->pr_reg_nacl = nacl;
 921                         pr_reg->pr_reg_deve = deve;
 922                         pr_reg->pr_reg_tg_pt_lun = lun;
 923
 924                         list_del(&pr_reg->pr_reg_aptpl_list);
 925                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 926                         /*
 927                          * At this point all of the pointers in *pr_reg will
 928                          * be setup, so go ahead and add the registration.
 929                          */
 930
 931                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 932                         /*
 933                          * If this registration is the reservation holder,
 934                          * make that happen now..
 935                          */
 936                         if (pr_reg->pr_res_holder)
 937                                 core_scsi3_aptpl_reserve(dev, tpg,
 938                                                 nacl, pr_reg);
 939                         /*
 940                          * Reenable pr_aptpl_active to accept new metadata
 941                          * updates once the SCSI device is active again..
 942                          */
 943                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 944                         pr_tmpl->pr_aptpl_active = 1;
 945                 }
 946         }
 947         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 948
 949         return 0;
 950 }
 951
 952 int core_scsi3_check_aptpl_registration(
 953         struct se_device *dev,
 954         struct se_portal_group *tpg,
 955         struct se_lun *lun,
 956         struct se_lun_acl *lun_acl)
 957 {
 958         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 959         struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
 960
 961         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
 962                 return 0;
 963
 964         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 965                                 lun->unpacked_lun, nacl, deve);
 966 }
 967
 968 static void __core_scsi3_dump_registration(
 969         struct target_core_fabric_ops *tfo,
 970         struct se_device *dev,
 971         struct se_node_acl *nacl,
 972         struct t10_pr_registration *pr_reg,
 973         enum register_type register_type)
 974 {
 975         struct se_portal_group *se_tpg = nacl->se_tpg;
 976         char i_buf[PR_REG_ISID_ID_LEN];
 977
 978         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
 979         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 980
 981         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
 982                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
 983                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
 984                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
 985                 i_buf);
 986         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
 987                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
 988                 tfo->tpg_get_tag(se_tpg));
 989         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
 990                 " Port(s)\n",  tfo->get_fabric_name(),
 991                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
 992                 dev->transport->name);
 993         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
 994                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
 995                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
 996                 pr_reg->pr_reg_aptpl);
 997 }
 998
 999 /*
1000  * this function can be called with struct se_device->dev_reservation_lock
1001  * when register_move = 1
1002  */
1003 static void __core_scsi3_add_registration(
1004         struct se_device *dev,
1005         struct se_node_acl *nacl,
1006         struct t10_pr_registration *pr_reg,
1007         enum register_type register_type,
1008         int register_move)
1009 {
1010         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1011         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1012         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1013
1014         /*
1015          * Increment PRgeneration counter for struct se_device upon a successful
1016          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1017          *
1018          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1019          * action, the struct se_device->dev_reservation_lock will already be held,
1020          * so we do not call core_scsi3_pr_generation() which grabs the lock
1021          * for the REGISTER.
1022          */
1023         pr_reg->pr_res_generation = (register_move) ?
1024                         dev->t10_pr.pr_generation++ :
1025                         core_scsi3_pr_generation(dev);
1026
1027         spin_lock(&pr_tmpl->registration_lock);
1028         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1029         pr_reg->pr_reg_deve->def_pr_registered = 1;
1030
1031         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1032         spin_unlock(&pr_tmpl->registration_lock);
1033         /*
1034          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1035          */
1036         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1037                 return;
1038         /*
1039          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1040          * allocated in __core_scsi3_alloc_registration()
1041          */
1042         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1043                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1044                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1045
1046                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1047
1048                 spin_lock(&pr_tmpl->registration_lock);
1049                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1050                               &pr_tmpl->registration_list);
1051                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1052
1053                 __core_scsi3_dump_registration(tfo, dev,
1054                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1055                                 register_type);
1056                 spin_unlock(&pr_tmpl->registration_lock);
1057                 /*
1058                  * Drop configfs group dependency reference from
1059                  * __core_scsi3_alloc_registration()
1060                  */
1061                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1062         }
1063 }
1064
1065 static int core_scsi3_alloc_registration(
1066         struct se_device *dev,
1067         struct se_node_acl *nacl,
1068         struct se_dev_entry *deve,
1069         unsigned char *isid,
1070         u64 sa_res_key,
1071         int all_tg_pt,
1072         int aptpl,
1073         enum register_type register_type,
1074         int register_move)
1075 {
1076         struct t10_pr_registration *pr_reg;
1077
1078         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1079                         sa_res_key, all_tg_pt, aptpl);
1080         if (!pr_reg)
1081                 return -EPERM;
1082
1083         __core_scsi3_add_registration(dev, nacl, pr_reg,
1084                         register_type, register_move);
1085         return 0;
1086 }
1087
1088 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1089         struct se_device *dev,
1090         struct se_node_acl *nacl,
1091         unsigned char *isid)
1092 {
1093         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1094         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1095         struct se_portal_group *tpg;
1096
1097         spin_lock(&pr_tmpl->registration_lock);
1098         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1099                         &pr_tmpl->registration_list, pr_reg_list) {
1100                 /*
1101                  * First look for a matching struct se_node_acl
1102                  */
1103                 if (pr_reg->pr_reg_nacl != nacl)
1104                         continue;
1105
1106                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1107                 /*
1108                  * If this registration does NOT contain a fabric provided
1109                  * ISID, then we have found a match.
1110                  */
1111                 if (!pr_reg->isid_present_at_reg) {
1112                         /*
1113                          * Determine if this SCSI device server requires that
1114                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1115                          * for fabric modules (iSCSI) requiring them.
1116                          */
1117                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1118                                 if (dev->dev_attrib.enforce_pr_isids)
1119                                         continue;
1120                         }
1121                         atomic_inc(&pr_reg->pr_res_holders);
1122                         smp_mb__after_atomic_inc();
1123                         spin_unlock(&pr_tmpl->registration_lock);
1124                         return pr_reg;
1125                 }
1126                 /*
1127                  * If the *pr_reg contains a fabric defined ISID for multi-value
1128                  * SCSI Initiator Port TransportIDs, then we expect a valid
1129                  * matching ISID to be provided by the local SCSI Initiator Port.
1130                  */
1131                 if (!isid)
1132                         continue;
1133                 if (strcmp(isid, pr_reg->pr_reg_isid))
1134                         continue;
1135
1136                 atomic_inc(&pr_reg->pr_res_holders);
1137                 smp_mb__after_atomic_inc();
1138                 spin_unlock(&pr_tmpl->registration_lock);
1139                 return pr_reg;
1140         }
1141         spin_unlock(&pr_tmpl->registration_lock);
1142
1143         return NULL;
1144 }
1145
1146 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1147         struct se_device *dev,
1148         struct se_node_acl *nacl,
1149         struct se_session *sess)
1150 {
1151         struct se_portal_group *tpg = nacl->se_tpg;
1152         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1153
1154         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1155                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1156                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1157                                         PR_REG_ISID_LEN);
1158                 isid_ptr = &buf[0];
1159         }
1160
1161         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1162 }
1163
1164 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1165 {
1166         atomic_dec(&pr_reg->pr_res_holders);
1167         smp_mb__after_atomic_dec();
1168 }
1169
1170 static int core_scsi3_check_implict_release(
1171         struct se_device *dev,
1172         struct t10_pr_registration *pr_reg)
1173 {
1174         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1175         struct t10_pr_registration *pr_res_holder;
1176         int ret = 0;
1177
1178         spin_lock(&dev->dev_reservation_lock);
1179         pr_res_holder = dev->dev_pr_res_holder;
1180         if (!pr_res_holder) {
1181                 spin_unlock(&dev->dev_reservation_lock);
1182                 return ret;
1183         }
1184         if (pr_res_holder == pr_reg) {
1185                 /*
1186                  * Perform an implict RELEASE if the registration that
1187                  * is being released is holding the reservation.
1188                  *
1189                  * From spc4r17, section 5.7.11.1:
1190                  *
1191                  * e) If the I_T nexus is the persistent reservation holder
1192                  *    and the persistent reservation is not an all registrants
1193                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1194                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1195                  *    service action with the SERVICE ACTION RESERVATION KEY
1196                  *    field set to zero (see 5.7.11.3).
1197                  */
1198                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1199                 ret = 1;
1200                 /*
1201                  * For 'All Registrants' reservation types, all existing
1202                  * registrations are still processed as reservation holders
1203                  * in core_scsi3_pr_seq_non_holder() after the initial
1204                  * reservation holder is implictly released here.
1205                  */
1206         } else if (pr_reg->pr_reg_all_tg_pt &&
1207                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1208                           pr_reg->pr_reg_nacl->initiatorname)) &&
1209                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1210                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1211                         " UNREGISTER while existing reservation with matching"
1212                         " key 0x%016Lx is present from another SCSI Initiator"
1213                         " Port\n", pr_reg->pr_res_key);
1214                 ret = -EPERM;
1215         }
1216         spin_unlock(&dev->dev_reservation_lock);
1217
1218         return ret;
1219 }
1220
1221 /*
1222  * Called with struct t10_reservation->registration_lock held.
1223  */
1224 static void __core_scsi3_free_registration(
1225         struct se_device *dev,
1226         struct t10_pr_registration *pr_reg,
1227         struct list_head *preempt_and_abort_list,
1228         int dec_holders)
1229 {
1230         struct target_core_fabric_ops *tfo =
1231                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1232         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1233         char i_buf[PR_REG_ISID_ID_LEN];
1234
1235         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1236         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1237
1238         pr_reg->pr_reg_deve->def_pr_registered = 0;
1239         pr_reg->pr_reg_deve->pr_res_key = 0;
1240         list_del(&pr_reg->pr_reg_list);
1241         /*
1242          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1243          * so call core_scsi3_put_pr_reg() to decrement our reference.
1244          */
1245         if (dec_holders)
1246                 core_scsi3_put_pr_reg(pr_reg);
1247         /*
1248          * Wait until all reference from any other I_T nexuses for this
1249          * *pr_reg have been released.  Because list_del() is called above,
1250          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1251          * count back to zero, and we release *pr_reg.
1252          */
1253         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1254                 spin_unlock(&pr_tmpl->registration_lock);
1255                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1256                                 tfo->get_fabric_name());
1257                 cpu_relax();
1258                 spin_lock(&pr_tmpl->registration_lock);
1259         }
1260
1261         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1262                 " Node: %s%s\n", tfo->get_fabric_name(),
1263                 pr_reg->pr_reg_nacl->initiatorname,
1264                 i_buf);
1265         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1266                 " Port(s)\n", tfo->get_fabric_name(),
1267                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1268                 dev->transport->name);
1269         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1270                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1271                 pr_reg->pr_res_generation);
1272
1273         if (!preempt_and_abort_list) {
1274                 pr_reg->pr_reg_deve = NULL;
1275                 pr_reg->pr_reg_nacl = NULL;
1276                 kfree(pr_reg->pr_aptpl_buf);
1277                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1278                 return;
1279         }
1280         /*
1281          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1282          * are released once the ABORT_TASK_SET has completed..
1283          */
1284         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1285 }
1286
1287 void core_scsi3_free_pr_reg_from_nacl(
1288         struct se_device *dev,
1289         struct se_node_acl *nacl)
1290 {
1291         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1292         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1293         /*
1294          * If the passed se_node_acl matches the reservation holder,
1295          * release the reservation.
1296          */
1297         spin_lock(&dev->dev_reservation_lock);
1298         pr_res_holder = dev->dev_pr_res_holder;
1299         if ((pr_res_holder != NULL) &&
1300             (pr_res_holder->pr_reg_nacl == nacl))
1301                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1302         spin_unlock(&dev->dev_reservation_lock);
1303         /*
1304          * Release any registration associated with the struct se_node_acl.
1305          */
1306         spin_lock(&pr_tmpl->registration_lock);
1307         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1308                         &pr_tmpl->registration_list, pr_reg_list) {
1309
1310                 if (pr_reg->pr_reg_nacl != nacl)
1311                         continue;
1312
1313                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1314         }
1315         spin_unlock(&pr_tmpl->registration_lock);
1316 }
1317
1318 void core_scsi3_free_all_registrations(
1319         struct se_device *dev)
1320 {
1321         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1322         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1323
1324         spin_lock(&dev->dev_reservation_lock);
1325         pr_res_holder = dev->dev_pr_res_holder;
1326         if (pr_res_holder != NULL) {
1327                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1328                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1329                                 pr_res_holder, 0);
1330         }
1331         spin_unlock(&dev->dev_reservation_lock);
1332
1333         spin_lock(&pr_tmpl->registration_lock);
1334         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1335                         &pr_tmpl->registration_list, pr_reg_list) {
1336
1337                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1338         }
1339         spin_unlock(&pr_tmpl->registration_lock);
1340
1341         spin_lock(&pr_tmpl->aptpl_reg_lock);
1342         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1343                                 pr_reg_aptpl_list) {
1344                 list_del(&pr_reg->pr_reg_aptpl_list);
1345                 kfree(pr_reg->pr_aptpl_buf);
1346                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1347         }
1348         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1349 }
1350
1351 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1352 {
1353         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1354                         &tpg->tpg_group.cg_item);
1355 }
1356
1357 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1358 {
1359         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1360                         &tpg->tpg_group.cg_item);
1361
1362         atomic_dec(&tpg->tpg_pr_ref_count);
1363         smp_mb__after_atomic_dec();
1364 }
1365
1366 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1367 {
1368         struct se_portal_group *tpg = nacl->se_tpg;
1369
1370         if (nacl->dynamic_node_acl)
1371                 return 0;
1372
1373         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1374                         &nacl->acl_group.cg_item);
1375 }
1376
1377 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1378 {
1379         struct se_portal_group *tpg = nacl->se_tpg;
1380
1381         if (nacl->dynamic_node_acl) {
1382                 atomic_dec(&nacl->acl_pr_ref_count);
1383                 smp_mb__after_atomic_dec();
1384                 return;
1385         }
1386
1387         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1388                         &nacl->acl_group.cg_item);
1389
1390         atomic_dec(&nacl->acl_pr_ref_count);
1391         smp_mb__after_atomic_dec();
1392 }
1393
1394 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1395 {
1396         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1397         struct se_node_acl *nacl;
1398         struct se_portal_group *tpg;
1399         /*
1400          * For nacl->dynamic_node_acl=1
1401          */
1402         if (!lun_acl)
1403                 return 0;
1404
1405         nacl = lun_acl->se_lun_nacl;
1406         tpg = nacl->se_tpg;
1407
1408         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1409                         &lun_acl->se_lun_group.cg_item);
1410 }
1411
1412 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1413 {
1414         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1415         struct se_node_acl *nacl;
1416         struct se_portal_group *tpg;
1417         /*
1418          * For nacl->dynamic_node_acl=1
1419          */
1420         if (!lun_acl) {
1421                 atomic_dec(&se_deve->pr_ref_count);
1422                 smp_mb__after_atomic_dec();
1423                 return;
1424         }
1425         nacl = lun_acl->se_lun_nacl;
1426         tpg = nacl->se_tpg;
1427
1428         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1429                         &lun_acl->se_lun_group.cg_item);
1430
1431         atomic_dec(&se_deve->pr_ref_count);
1432         smp_mb__after_atomic_dec();
1433 }
1434
1435 static sense_reason_t
1436 core_scsi3_decode_spec_i_port(
1437         struct se_cmd *cmd,
1438         struct se_portal_group *tpg,
1439         unsigned char *l_isid,
1440         u64 sa_res_key,
1441         int all_tg_pt,
1442         int aptpl)
1443 {
1444         struct se_device *dev = cmd->se_dev;
1445         struct se_port *tmp_port;
1446         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1447         struct se_session *se_sess = cmd->se_sess;
1448         struct se_node_acl *dest_node_acl = NULL;
1449         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1450         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1451         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1452         LIST_HEAD(tid_dest_list);
1453         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1454         struct target_core_fabric_ops *tmp_tf_ops;
1455         unsigned char *buf;
1456         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1457         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1458         sense_reason_t ret;
1459         u32 tpdl, tid_len = 0;
1460         int dest_local_nexus;
1461         u32 dest_rtpi = 0;
1462
1463         memset(dest_iport, 0, 64);
1464
1465         local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1466         /*
1467          * Allocate a struct pr_transport_id_holder and setup the
1468          * local_node_acl and local_se_deve pointers and add to
1469          * struct list_head tid_dest_list for add registration
1470          * processing in the loop of tid_dest_list below.
1471          */
1472         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1473         if (!tidh_new) {
1474                 pr_err("Unable to allocate tidh_new\n");
1475                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1476         }
1477         INIT_LIST_HEAD(&tidh_new->dest_list);
1478         tidh_new->dest_tpg = tpg;
1479         tidh_new->dest_node_acl = se_sess->se_node_acl;
1480         tidh_new->dest_se_deve = local_se_deve;
1481
1482         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1483                                 se_sess->se_node_acl, local_se_deve, l_isid,
1484                                 sa_res_key, all_tg_pt, aptpl);
1485         if (!local_pr_reg) {
1486                 kfree(tidh_new);
1487                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1488         }
1489         tidh_new->dest_pr_reg = local_pr_reg;
1490         /*
1491          * The local I_T nexus does not hold any configfs dependances,
1492          * so we set tid_h->dest_local_nexus=1 to prevent the
1493          * configfs_undepend_item() calls in the tid_dest_list loops below.
1494          */
1495         tidh_new->dest_local_nexus = 1;
1496         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1497
1498         if (cmd->data_length < 28) {
1499                 pr_warn("SPC-PR: Received PR OUT parameter list"
1500                         " length too small: %u\n", cmd->data_length);
1501                 ret = TCM_INVALID_PARAMETER_LIST;
1502                 goto out;
1503         }
1504
1505         buf = transport_kmap_data_sg(cmd);
1506         if (!buf) {
1507                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1508                 goto out;
1509         }
1510
1511         /*
1512          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1513          * first extract TransportID Parameter Data Length, and make sure
1514          * the value matches up to the SCSI expected data transfer length.
1515          */
1516         tpdl = (buf[24] & 0xff) << 24;
1517         tpdl |= (buf[25] & 0xff) << 16;
1518         tpdl |= (buf[26] & 0xff) << 8;
1519         tpdl |= buf[27] & 0xff;
1520
1521         if ((tpdl + 28) != cmd->data_length) {
1522                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1523                         " does not equal CDB data_length: %u\n", tpdl,
1524                         cmd->data_length);
1525                 ret = TCM_INVALID_PARAMETER_LIST;
1526                 goto out_unmap;
1527         }
1528         /*
1529          * Start processing the received transport IDs using the
1530          * receiving I_T Nexus portal's fabric dependent methods to
1531          * obtain the SCSI Initiator Port/Device Identifiers.
1532          */
1533         ptr = &buf[28];
1534
1535         while (tpdl > 0) {
1536                 proto_ident = (ptr[0] & 0x0f);
1537                 dest_tpg = NULL;
1538
1539                 spin_lock(&dev->se_port_lock);
1540                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1541                         tmp_tpg = tmp_port->sep_tpg;
1542                         if (!tmp_tpg)
1543                                 continue;
1544                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1545                         if (!tmp_tf_ops)
1546                                 continue;
1547                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1548                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1549                                 continue;
1550                         /*
1551                          * Look for the matching proto_ident provided by
1552                          * the received TransportID
1553                          */
1554                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1555                         if (tmp_proto_ident != proto_ident)
1556                                 continue;
1557                         dest_rtpi = tmp_port->sep_rtpi;
1558
1559                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1560                                         tmp_tpg, (const char *)ptr, &tid_len,
1561                                         &iport_ptr);
1562                         if (!i_str)
1563                                 continue;
1564
1565                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1566                         smp_mb__after_atomic_inc();
1567                         spin_unlock(&dev->se_port_lock);
1568
1569                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1570                                 pr_err(" core_scsi3_tpg_depend_item()"
1571                                         " for tmp_tpg\n");
1572                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1573                                 smp_mb__after_atomic_dec();
1574                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1575                                 goto out_unmap;
1576                         }
1577                         /*
1578                          * Locate the destination initiator ACL to be registered
1579                          * from the decoded fabric module specific TransportID
1580                          * at *i_str.
1581                          */
1582                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1583                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1584                                                 tmp_tpg, i_str);
1585                         if (dest_node_acl) {
1586                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1587                                 smp_mb__after_atomic_inc();
1588                         }
1589                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1590
1591                         if (!dest_node_acl) {
1592                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1593                                 spin_lock(&dev->se_port_lock);
1594                                 continue;
1595                         }
1596
1597                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1598                                 pr_err("configfs_depend_item() failed"
1599                                         " for dest_node_acl->acl_group\n");
1600                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1601                                 smp_mb__after_atomic_dec();
1602                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1603                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1604                                 goto out_unmap;
1605                         }
1606
1607                         dest_tpg = tmp_tpg;
1608                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1609                                 " %s Port RTPI: %hu\n",
1610                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1611                                 dest_node_acl->initiatorname, dest_rtpi);
1612
1613                         spin_lock(&dev->se_port_lock);
1614                         break;
1615                 }
1616                 spin_unlock(&dev->se_port_lock);
1617
1618                 if (!dest_tpg) {
1619                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1620                                         " dest_tpg\n");
1621                         ret = TCM_INVALID_PARAMETER_LIST;
1622                         goto out_unmap;
1623                 }
1624
1625                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1626                         " tid_len: %d for %s + %s\n",
1627                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1628                         tpdl, tid_len, i_str, iport_ptr);
1629
1630                 if (tid_len > tpdl) {
1631                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1632                                 " %u for Transport ID: %s\n", tid_len, ptr);
1633                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1634                         core_scsi3_tpg_undepend_item(dest_tpg);
1635                         ret = TCM_INVALID_PARAMETER_LIST;
1636                         goto out_unmap;
1637                 }
1638                 /*
1639                  * Locate the desintation struct se_dev_entry pointer for matching
1640                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1641                  * Target Port.
1642                  */
1643                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1644                                         dest_rtpi);
1645                 if (!dest_se_deve) {
1646                         pr_err("Unable to locate %s dest_se_deve"
1647                                 " from destination RTPI: %hu\n",
1648                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1649                                 dest_rtpi);
1650
1651                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1652                         core_scsi3_tpg_undepend_item(dest_tpg);
1653                         ret = TCM_INVALID_PARAMETER_LIST;
1654                         goto out_unmap;
1655                 }
1656
1657                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1658                         pr_err("core_scsi3_lunacl_depend_item()"
1659                                         " failed\n");
1660                         atomic_dec(&dest_se_deve->pr_ref_count);
1661                         smp_mb__after_atomic_dec();
1662                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1663                         core_scsi3_tpg_undepend_item(dest_tpg);
1664                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1665                         goto out_unmap;
1666                 }
1667
1668                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1669                         " dest_se_deve mapped_lun: %u\n",
1670                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1671                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1672
1673                 /*
1674                  * Skip any TransportIDs that already have a registration for
1675                  * this target port.
1676                  */
1677                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1678                                         iport_ptr);
1679                 if (pr_reg_e) {
1680                         core_scsi3_put_pr_reg(pr_reg_e);
1681                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1682                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1683                         core_scsi3_tpg_undepend_item(dest_tpg);
1684                         ptr += tid_len;
1685                         tpdl -= tid_len;
1686                         tid_len = 0;
1687                         continue;
1688                 }
1689                 /*
1690                  * Allocate a struct pr_transport_id_holder and setup
1691                  * the dest_node_acl and dest_se_deve pointers for the
1692                  * loop below.
1693                  */
1694                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1695                                 GFP_KERNEL);
1696                 if (!tidh_new) {
1697                         pr_err("Unable to allocate tidh_new\n");
1698                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1699                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1700                         core_scsi3_tpg_undepend_item(dest_tpg);
1701                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1702                         goto out_unmap;
1703                 }
1704                 INIT_LIST_HEAD(&tidh_new->dest_list);
1705                 tidh_new->dest_tpg = dest_tpg;
1706                 tidh_new->dest_node_acl = dest_node_acl;
1707                 tidh_new->dest_se_deve = dest_se_deve;
1708
1709                 /*
1710                  * Allocate, but do NOT add the registration for the
1711                  * TransportID referenced SCSI Initiator port.  This
1712                  * done because of the following from spc4r17 in section
1713                  * 6.14.3 wrt SPEC_I_PT:
1714                  *
1715                  * "If a registration fails for any initiator port (e.g., if th
1716                  * logical unit does not have enough resources available to
1717                  * hold the registration information), no registrations shall be
1718                  * made, and the command shall be terminated with
1719                  * CHECK CONDITION status."
1720                  *
1721                  * That means we call __core_scsi3_alloc_registration() here,
1722                  * and then call __core_scsi3_add_registration() in the
1723                  * 2nd loop which will never fail.
1724                  */
1725                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1726                                 dest_node_acl, dest_se_deve, iport_ptr,
1727                                 sa_res_key, all_tg_pt, aptpl);
1728                 if (!dest_pr_reg) {
1729                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1730                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1731                         core_scsi3_tpg_undepend_item(dest_tpg);
1732                         kfree(tidh_new);
1733                         ret = TCM_INVALID_PARAMETER_LIST;
1734                         goto out_unmap;
1735                 }
1736                 tidh_new->dest_pr_reg = dest_pr_reg;
1737                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1738
1739                 ptr += tid_len;
1740                 tpdl -= tid_len;
1741                 tid_len = 0;
1742
1743         }
1744
1745         transport_kunmap_data_sg(cmd);
1746
1747         /*
1748          * Go ahead and create a registrations from tid_dest_list for the
1749          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1750          * and dest_se_deve.
1751          *
1752          * The SA Reservation Key from the PROUT is set for the
1753          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1754          * means that the TransportID Initiator port will be
1755          * registered on all of the target ports in the SCSI target device
1756          * ALL_TG_PT=0 means the registration will only be for the
1757          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1758          * was received.
1759          */
1760         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1761                 dest_tpg = tidh->dest_tpg;
1762                 dest_node_acl = tidh->dest_node_acl;
1763                 dest_se_deve = tidh->dest_se_deve;
1764                 dest_pr_reg = tidh->dest_pr_reg;
1765                 dest_local_nexus = tidh->dest_local_nexus;
1766
1767                 list_del(&tidh->dest_list);
1768                 kfree(tidh);
1769
1770                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1771                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1772
1773                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1774                                         dest_pr_reg, 0, 0);
1775
1776                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1777                         " registered Transport ID for Node: %s%s Mapped LUN:"
1778                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1779                         dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
1780
1781                 if (dest_local_nexus)
1782                         continue;
1783
1784                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1785                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1786                 core_scsi3_tpg_undepend_item(dest_tpg);
1787         }
1788
1789         return 0;
1790 out_unmap:
1791         transport_kunmap_data_sg(cmd);
1792 out:
1793         /*
1794          * For the failure case, release everything from tid_dest_list
1795          * including *dest_pr_reg and the configfs dependances..
1796          */
1797         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1798                 dest_tpg = tidh->dest_tpg;
1799                 dest_node_acl = tidh->dest_node_acl;
1800                 dest_se_deve = tidh->dest_se_deve;
1801                 dest_pr_reg = tidh->dest_pr_reg;
1802                 dest_local_nexus = tidh->dest_local_nexus;
1803
1804                 list_del(&tidh->dest_list);
1805                 kfree(tidh);
1806                 /*
1807                  * Release any extra ALL_TG_PT=1 registrations for
1808                  * the SPEC_I_PT=1 case.
1809                  */
1810                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1811                                 &dest_pr_reg->pr_reg_atp_list,
1812                                 pr_reg_atp_mem_list) {
1813                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1814                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1815                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1816                 }
1817
1818                 kfree(dest_pr_reg->pr_aptpl_buf);
1819                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1820
1821                 if (dest_local_nexus)
1822                         continue;
1823
1824                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1825                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1826                 core_scsi3_tpg_undepend_item(dest_tpg);
1827         }
1828         return ret;
1829 }
1830
1831 /*
1832  * Called with struct se_device->dev_reservation_lock held
1833  */
1834 static int __core_scsi3_update_aptpl_buf(
1835         struct se_device *dev,
1836         unsigned char *buf,
1837         u32 pr_aptpl_buf_len)
1838 {
1839         struct se_lun *lun;
1840         struct se_portal_group *tpg;
1841         struct t10_pr_registration *pr_reg;
1842         unsigned char tmp[512], isid_buf[32];
1843         ssize_t len = 0;
1844         int reg_count = 0;
1845
1846         memset(buf, 0, pr_aptpl_buf_len);
1847
1848         /*
1849          * Walk the registration list..
1850          */
1851         spin_lock(&dev->t10_pr.registration_lock);
1852         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1853                         pr_reg_list) {
1854
1855                 tmp[0] = '\0';
1856                 isid_buf[0] = '\0';
1857                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1858                 lun = pr_reg->pr_reg_tg_pt_lun;
1859                 /*
1860                  * Write out any ISID value to APTPL metadata that was included
1861                  * in the original registration.
1862                  */
1863                 if (pr_reg->isid_present_at_reg)
1864                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1865                                         pr_reg->pr_reg_isid);
1866                 /*
1867                  * Include special metadata if the pr_reg matches the
1868                  * reservation holder.
1869                  */
1870                 if (dev->dev_pr_res_holder == pr_reg) {
1871                         snprintf(tmp, 512, "PR_REG_START: %d"
1872                                 "\ninitiator_fabric=%s\n"
1873                                 "initiator_node=%s\n%s"
1874                                 "sa_res_key=%llu\n"
1875                                 "res_holder=1\nres_type=%02x\n"
1876                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1877                                 "mapped_lun=%u\n", reg_count,
1878                                 tpg->se_tpg_tfo->get_fabric_name(),
1879                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1880                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1881                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1882                                 pr_reg->pr_res_mapped_lun);
1883                 } else {
1884                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1885                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1886                                 "sa_res_key=%llu\nres_holder=0\n"
1887                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1888                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1889                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1890                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1891                                 pr_reg->pr_res_mapped_lun);
1892                 }
1893
1894                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1895                         pr_err("Unable to update renaming"
1896                                 " APTPL metadata\n");
1897                         spin_unlock(&dev->t10_pr.registration_lock);
1898                         return -EMSGSIZE;
1899                 }
1900                 len += sprintf(buf+len, "%s", tmp);
1901
1902                 /*
1903                  * Include information about the associated SCSI target port.
1904                  */
1905                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1906                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1907                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1908                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1909                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1910                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1911
1912                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1913                         pr_err("Unable to update renaming"
1914                                 " APTPL metadata\n");
1915                         spin_unlock(&dev->t10_pr.registration_lock);
1916                         return -EMSGSIZE;
1917                 }
1918                 len += sprintf(buf+len, "%s", tmp);
1919                 reg_count++;
1920         }
1921         spin_unlock(&dev->t10_pr.registration_lock);
1922
1923         if (!reg_count)
1924                 len += sprintf(buf+len, "No Registrations or Reservations");
1925
1926         return 0;
1927 }
1928
1929 static int core_scsi3_update_aptpl_buf(
1930         struct se_device *dev,
1931         unsigned char *buf,
1932         u32 pr_aptpl_buf_len)
1933 {
1934         int ret;
1935
1936         spin_lock(&dev->dev_reservation_lock);
1937         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len);
1938         spin_unlock(&dev->dev_reservation_lock);
1939
1940         return ret;
1941 }
1942
1943 /*
1944  * Called with struct se_device->aptpl_file_mutex held
1945  */
1946 static int __core_scsi3_write_aptpl_to_file(
1947         struct se_device *dev,
1948         unsigned char *buf,
1949         u32 pr_aptpl_buf_len)
1950 {
1951         struct t10_wwn *wwn = &dev->t10_wwn;
1952         struct file *file;
1953         int flags = O_RDWR | O_CREAT | O_TRUNC;
1954         char path[512];
1955         int ret;
1956
1957         memset(path, 0, 512);
1958
1959         if (strlen(&wwn->unit_serial[0]) >= 512) {
1960                 pr_err("WWN value for struct se_device does not fit"
1961                         " into path buffer\n");
1962                 return -EMSGSIZE;
1963         }
1964
1965         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1966         file = filp_open(path, flags, 0600);
1967         if (IS_ERR(file)) {
1968                 pr_err("filp_open(%s) for APTPL metadata"
1969                         " failed\n", path);
1970                 return PTR_ERR(file);
1971         }
1972
1973         if (!pr_aptpl_buf_len)
1974                 pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
1975
1976         ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1977
1978         if (ret < 0)
1979                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1980         fput(file);
1981
1982         return ret ? -EIO : 0;
1983 }
1984
1985 static int
1986 core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf,
1987                 u32 in_pr_aptpl_buf_len)
1988 {
1989         unsigned char null_buf[64], *buf;
1990         int ret;
1991
1992         /*
1993          * Can be called with a NULL pointer from PROUT service action CLEAR
1994          */
1995         if (!in_buf) {
1996                 snprintf(null_buf, 64, "No Registrations or Reservations\n");
1997                 buf = null_buf;
1998         } else {
1999                 ret = core_scsi3_update_aptpl_buf(dev, in_buf, in_pr_aptpl_buf_len);
2000                 if (ret != 0)
2001                         return ret;
2002                 buf = in_buf;
2003         }
2004
2005         /*
2006          * __core_scsi3_write_aptpl_to_file() will call strlen()
2007          * on the passed buf to determine pr_aptpl_buf_len.
2008          */
2009         return __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2010 }
2011
2012 static sense_reason_t
2013 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2014                 int aptpl, int all_tg_pt, int spec_i_pt, enum register_type register_type)
2015 {
2016         struct se_session *se_sess = cmd->se_sess;
2017         struct se_device *dev = cmd->se_dev;
2018         struct se_dev_entry *se_deve;
2019         struct se_lun *se_lun = cmd->se_lun;
2020         struct se_portal_group *se_tpg;
2021         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2022         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2023         /* Used for APTPL metadata w/ UNREGISTER */
2024         unsigned char *pr_aptpl_buf = NULL;
2025         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2026         sense_reason_t ret = TCM_NO_SENSE;
2027         int pr_holder = 0, type;
2028
2029         if (!se_sess || !se_lun) {
2030                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2031                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2032         }
2033         se_tpg = se_sess->se_tpg;
2034         se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2035
2036         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2037                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2038                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2039                                 PR_REG_ISID_LEN);
2040                 isid_ptr = &isid_buf[0];
2041         }
2042         /*
2043          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2044          */
2045         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2046         if (!pr_reg_e) {
2047                 if (res_key) {
2048                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2049                                 " for SA REGISTER, returning CONFLICT\n");
2050                         return TCM_RESERVATION_CONFLICT;
2051                 }
2052                 /*
2053                  * Do nothing but return GOOD status.
2054                  */
2055                 if (!sa_res_key)
2056                         return 0;
2057
2058                 if (!spec_i_pt) {
2059                         /*
2060                          * Perform the Service Action REGISTER on the Initiator
2061                          * Port Endpoint that the PRO was received from on the
2062                          * Logical Unit of the SCSI device server.
2063                          */
2064                         if (core_scsi3_alloc_registration(cmd->se_dev,
2065                                         se_sess->se_node_acl, se_deve, isid_ptr,
2066                                         sa_res_key, all_tg_pt, aptpl,
2067                                         register_type, 0)) {
2068                                 pr_err("Unable to allocate"
2069                                         " struct t10_pr_registration\n");
2070                                 return TCM_INVALID_PARAMETER_LIST;
2071                         }
2072                 } else {
2073                         /*
2074                          * Register both the Initiator port that received
2075                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2076                          * TransportID from Parameter list and loop through
2077                          * fabric dependent parameter list while calling
2078                          * logic from of core_scsi3_alloc_registration() for
2079                          * each TransportID provided SCSI Initiator Port/Device
2080                          */
2081                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2082                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2083                         if (ret != 0)
2084                                 return ret;
2085                 }
2086                 /*
2087                  * Nothing left to do for the APTPL=0 case.
2088                  */
2089                 if (!aptpl) {
2090                         pr_tmpl->pr_aptpl_active = 0;
2091                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2092                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2093                                         " REGISTER\n");
2094                         return 0;
2095                 }
2096                 /*
2097                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2098                  * update the APTPL metadata information using its
2099                  * preallocated *pr_reg->pr_aptpl_buf.
2100                  */
2101                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2102                                 se_sess->se_node_acl, se_sess);
2103
2104                 if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
2105                                 &pr_reg->pr_aptpl_buf[0],
2106                                 pr_tmpl->pr_aptpl_buf_len)) {
2107                         pr_tmpl->pr_aptpl_active = 1;
2108                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2109                 }
2110
2111                 goto out_put_pr_reg;
2112         }
2113
2114         /*
2115          * Locate the existing *pr_reg via struct se_node_acl pointers
2116          */
2117         pr_reg = pr_reg_e;
2118         type = pr_reg->pr_res_type;
2119
2120         if (register_type == REGISTER) {
2121                 if (res_key != pr_reg->pr_res_key) {
2122                         pr_err("SPC-3 PR REGISTER: Received"
2123                                 " res_key: 0x%016Lx does not match"
2124                                 " existing SA REGISTER res_key:"
2125                                 " 0x%016Lx\n", res_key,
2126                                 pr_reg->pr_res_key);
2127                         ret = TCM_RESERVATION_CONFLICT;
2128                         goto out_put_pr_reg;
2129                 }
2130         }
2131
2132         if (spec_i_pt) {
2133                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2134                         " set on a registered nexus\n");
2135                 ret = TCM_INVALID_PARAMETER_LIST;
2136                 goto out_put_pr_reg;
2137         }
2138
2139         /*
2140          * An existing ALL_TG_PT=1 registration being released
2141          * must also set ALL_TG_PT=1 in the incoming PROUT.
2142          */
2143         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2144                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2145                         " registration exists, but ALL_TG_PT=1 bit not"
2146                         " present in received PROUT\n");
2147                 ret = TCM_INVALID_CDB_FIELD;
2148                 goto out_put_pr_reg;
2149         }
2150
2151         /*
2152          * Allocate APTPL metadata buffer used for UNREGISTER ops
2153          */
2154         if (aptpl) {
2155                 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2156                                         GFP_KERNEL);
2157                 if (!pr_aptpl_buf) {
2158                         pr_err("Unable to allocate"
2159                                 " pr_aptpl_buf\n");
2160                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2161                         goto out_put_pr_reg;
2162                 }
2163         }
2164
2165         /*
2166          * sa_res_key=0 Unregister Reservation Key for registered I_T
2167          * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2168          * Nexus.
2169          */
2170         if (!sa_res_key) {
2171                 pr_holder = core_scsi3_check_implict_release(
2172                                 cmd->se_dev, pr_reg);
2173                 if (pr_holder < 0) {
2174                         kfree(pr_aptpl_buf);
2175                         ret = TCM_RESERVATION_CONFLICT;
2176                         goto out_put_pr_reg;
2177                 }
2178
2179                 spin_lock(&pr_tmpl->registration_lock);
2180                 /*
2181                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2182                  * and matching pr_res_key.
2183                  */
2184                 if (pr_reg->pr_reg_all_tg_pt) {
2185                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2186                                         &pr_tmpl->registration_list,
2187                                         pr_reg_list) {
2188
2189                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2190                                         continue;
2191                                 if (pr_reg_p->pr_res_key != res_key)
2192                                         continue;
2193                                 if (pr_reg == pr_reg_p)
2194                                         continue;
2195                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2196                                            pr_reg_p->pr_reg_nacl->initiatorname))
2197                                         continue;
2198
2199                                 __core_scsi3_free_registration(dev,
2200                                                 pr_reg_p, NULL, 0);
2201                         }
2202                 }
2203
2204                 /*
2205                  * Release the calling I_T Nexus registration now..
2206                  */
2207                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2208
2209                 /*
2210                  * From spc4r17, section 5.7.11.3 Unregistering
2211                  *
2212                  * If the persistent reservation is a registrants only
2213                  * type, the device server shall establish a unit
2214                  * attention condition for the initiator port associated
2215                  * with every registered I_T nexus except for the I_T
2216                  * nexus on which the PERSISTENT RESERVE OUT command was
2217                  * received, with the additional sense code set to
2218                  * RESERVATIONS RELEASED.
2219                  */
2220                 if (pr_holder &&
2221                    (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2222                     type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2223                         list_for_each_entry(pr_reg_p,
2224                                         &pr_tmpl->registration_list,
2225                                         pr_reg_list) {
2226
2227                                 core_scsi3_ua_allocate(
2228                                         pr_reg_p->pr_reg_nacl,
2229                                         pr_reg_p->pr_res_mapped_lun,
2230                                         0x2A,
2231                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2232                         }
2233                 }
2234                 spin_unlock(&pr_tmpl->registration_lock);
2235
2236                 if (!aptpl) {
2237                         pr_tmpl->pr_aptpl_active = 0;
2238                         core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2239                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2240                                         " for UNREGISTER\n");
2241                         return 0;
2242                 }
2243
2244                 if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2245                                 pr_tmpl->pr_aptpl_buf_len)) {
2246                         pr_tmpl->pr_aptpl_active = 1;
2247                         pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2248                                         " for UNREGISTER\n");
2249                 }
2250
2251                 goto out_free_aptpl_buf;
2252         }
2253
2254         /*
2255          * Increment PRgeneration counter for struct se_device"
2256          * upon a successful REGISTER, see spc4r17 section 6.3.2
2257          * READ_KEYS service action.
2258          */
2259         pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2260         pr_reg->pr_res_key = sa_res_key;
2261         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2262                 " Key for %s to: 0x%016Lx PRgeneration:"
2263                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2264                 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2265                 pr_reg->pr_reg_nacl->initiatorname,
2266                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2267
2268         if (!aptpl) {
2269                 pr_tmpl->pr_aptpl_active = 0;
2270                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2271                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2272                                 " for REGISTER\n");
2273                 ret = 0;
2274                 goto out_put_pr_reg;
2275         }
2276
2277         if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
2278                                                 pr_tmpl->pr_aptpl_buf_len)) {
2279                 pr_tmpl->pr_aptpl_active = 1;
2280                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2281                         " for REGISTER\n");
2282         }
2283
2284 out_free_aptpl_buf:
2285         kfree(pr_aptpl_buf);
2286         ret = 0;
2287 out_put_pr_reg:
2288         core_scsi3_put_pr_reg(pr_reg);
2289         return ret;
2290 }
2291
2292 unsigned char *core_scsi3_pr_dump_type(int type)
2293 {
2294         switch (type) {
2295         case PR_TYPE_WRITE_EXCLUSIVE:
2296                 return "Write Exclusive Access";
2297         case PR_TYPE_EXCLUSIVE_ACCESS:
2298                 return "Exclusive Access";
2299         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2300                 return "Write Exclusive Access, Registrants Only";
2301         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2302                 return "Exclusive Access, Registrants Only";
2303         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2304                 return "Write Exclusive Access, All Registrants";
2305         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2306                 return "Exclusive Access, All Registrants";
2307         default:
2308                 break;
2309         }
2310
2311         return "Unknown SPC-3 PR Type";
2312 }
2313
2314 static sense_reason_t
2315 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2316 {
2317         struct se_device *dev = cmd->se_dev;
2318         struct se_session *se_sess = cmd->se_sess;
2319         struct se_lun *se_lun = cmd->se_lun;
2320         struct t10_pr_registration *pr_reg, *pr_res_holder;
2321         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2322         char i_buf[PR_REG_ISID_ID_LEN];
2323         sense_reason_t ret;
2324
2325         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2326
2327         if (!se_sess || !se_lun) {
2328                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2329                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2330         }
2331         /*
2332          * Locate the existing *pr_reg via struct se_node_acl pointers
2333          */
2334         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2335                                 se_sess);
2336         if (!pr_reg) {
2337                 pr_err("SPC-3 PR: Unable to locate"
2338                         " PR_REGISTERED *pr_reg for RESERVE\n");
2339                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2340         }
2341         /*
2342          * From spc4r17 Section 5.7.9: Reserving:
2343          *
2344          * An application client creates a persistent reservation by issuing
2345          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2346          * a registered I_T nexus with the following parameters:
2347          *    a) RESERVATION KEY set to the value of the reservation key that is
2348          *       registered with the logical unit for the I_T nexus; and
2349          */
2350         if (res_key != pr_reg->pr_res_key) {
2351                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2352                         " does not match existing SA REGISTER res_key:"
2353                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2354                 ret = TCM_RESERVATION_CONFLICT;
2355                 goto out_put_pr_reg;
2356         }
2357         /*
2358          * From spc4r17 Section 5.7.9: Reserving:
2359          *
2360          * From above:
2361          *  b) TYPE field and SCOPE field set to the persistent reservation
2362          *     being created.
2363          *
2364          * Only one persistent reservation is allowed at a time per logical unit
2365          * and that persistent reservation has a scope of LU_SCOPE.
2366          */
2367         if (scope != PR_SCOPE_LU_SCOPE) {
2368                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2369                 ret = TCM_INVALID_PARAMETER_LIST;
2370                 goto out_put_pr_reg;
2371         }
2372         /*
2373          * See if we have an existing PR reservation holder pointer at
2374          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2375          * *pr_res_holder.
2376          */
2377         spin_lock(&dev->dev_reservation_lock);
2378         pr_res_holder = dev->dev_pr_res_holder;
2379         if (pr_res_holder) {
2380                 /*
2381                  * From spc4r17 Section 5.7.9: Reserving:
2382                  *
2383                  * If the device server receives a PERSISTENT RESERVE OUT
2384                  * command from an I_T nexus other than a persistent reservation
2385                  * holder (see 5.7.10) that attempts to create a persistent
2386                  * reservation when a persistent reservation already exists for
2387                  * the logical unit, then the command shall be completed with
2388                  * RESERVATION CONFLICT status.
2389                  */
2390                 if (pr_res_holder != pr_reg) {
2391                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2392                         pr_err("SPC-3 PR: Attempted RESERVE from"
2393                                 " [%s]: %s while reservation already held by"
2394                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2395                                 cmd->se_tfo->get_fabric_name(),
2396                                 se_sess->se_node_acl->initiatorname,
2397                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2398                                 pr_res_holder->pr_reg_nacl->initiatorname);
2399
2400                         spin_unlock(&dev->dev_reservation_lock);
2401                         ret = TCM_RESERVATION_CONFLICT;
2402                         goto out_put_pr_reg;
2403                 }
2404                 /*
2405                  * From spc4r17 Section 5.7.9: Reserving:
2406                  *
2407                  * If a persistent reservation holder attempts to modify the
2408                  * type or scope of an existing persistent reservation, the
2409                  * command shall be completed with RESERVATION CONFLICT status.
2410                  */
2411                 if ((pr_res_holder->pr_res_type != type) ||
2412                     (pr_res_holder->pr_res_scope != scope)) {
2413                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2414                         pr_err("SPC-3 PR: Attempted RESERVE from"
2415                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2416                                 " while reservation already held by [%s]: %s,"
2417                                 " returning RESERVATION_CONFLICT\n",
2418                                 cmd->se_tfo->get_fabric_name(),
2419                                 se_sess->se_node_acl->initiatorname,
2420                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2421                                 pr_res_holder->pr_reg_nacl->initiatorname);
2422
2423                         spin_unlock(&dev->dev_reservation_lock);
2424                         ret = TCM_RESERVATION_CONFLICT;
2425                         goto out_put_pr_reg;
2426                 }
2427                 /*
2428                  * From spc4r17 Section 5.7.9: Reserving:
2429                  *
2430                  * If the device server receives a PERSISTENT RESERVE OUT
2431                  * command with RESERVE service action where the TYPE field and
2432                  * the SCOPE field contain the same values as the existing type
2433                  * and scope from a persistent reservation holder, it shall not
2434                  * make any change to the existing persistent reservation and
2435                  * shall completethe command with GOOD status.
2436                  */
2437                 spin_unlock(&dev->dev_reservation_lock);
2438                 ret = 0;
2439                 goto out_put_pr_reg;
2440         }
2441         /*
2442          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2443          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2444          */
2445         pr_reg->pr_res_scope = scope;
2446         pr_reg->pr_res_type = type;
2447         pr_reg->pr_res_holder = 1;
2448         dev->dev_pr_res_holder = pr_reg;
2449         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2450
2451         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2452                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2453                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2454                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2455         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2456                         cmd->se_tfo->get_fabric_name(),
2457                         se_sess->se_node_acl->initiatorname,
2458                         i_buf);
2459         spin_unlock(&dev->dev_reservation_lock);
2460
2461         if (pr_tmpl->pr_aptpl_active) {
2462                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2463                                 &pr_reg->pr_aptpl_buf[0],
2464                                 pr_tmpl->pr_aptpl_buf_len)) {
2465                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2466                                         " for RESERVE\n");
2467                 }
2468         }
2469
2470         ret = 0;
2471 out_put_pr_reg:
2472         core_scsi3_put_pr_reg(pr_reg);
2473         return ret;
2474 }
2475
2476 static sense_reason_t
2477 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2478                 u64 res_key)
2479 {
2480         switch (type) {
2481         case PR_TYPE_WRITE_EXCLUSIVE:
2482         case PR_TYPE_EXCLUSIVE_ACCESS:
2483         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2484         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2485         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2486         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2487                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2488         default:
2489                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2490                         " 0x%02x\n", type);
2491                 return TCM_INVALID_CDB_FIELD;
2492         }
2493 }
2494
2495 /*
2496  * Called with struct se_device->dev_reservation_lock held.
2497  */
2498 static void __core_scsi3_complete_pro_release(
2499         struct se_device *dev,
2500         struct se_node_acl *se_nacl,
2501         struct t10_pr_registration *pr_reg,
2502         int explict)
2503 {
2504         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2505         char i_buf[PR_REG_ISID_ID_LEN];
2506
2507         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2508         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2509         /*
2510          * Go ahead and release the current PR reservation holder.
2511          */
2512         dev->dev_pr_res_holder = NULL;
2513
2514         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2515                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2516                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2517                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2518                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2519         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2520                 tfo->get_fabric_name(), se_nacl->initiatorname,
2521                 i_buf);
2522         /*
2523          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2524          */
2525         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2526 }
2527
2528 static sense_reason_t
2529 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2530                 u64 res_key)
2531 {
2532         struct se_device *dev = cmd->se_dev;
2533         struct se_session *se_sess = cmd->se_sess;
2534         struct se_lun *se_lun = cmd->se_lun;
2535         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2536         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2537         int all_reg = 0;
2538         sense_reason_t ret = 0;
2539
2540         if (!se_sess || !se_lun) {
2541                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2542                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2543         }
2544         /*
2545          * Locate the existing *pr_reg via struct se_node_acl pointers
2546          */
2547         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2548         if (!pr_reg) {
2549                 pr_err("SPC-3 PR: Unable to locate"
2550                         " PR_REGISTERED *pr_reg for RELEASE\n");
2551                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2552         }
2553         /*
2554          * From spc4r17 Section 5.7.11.2 Releasing:
2555          *
2556          * If there is no persistent reservation or in response to a persistent
2557          * reservation release request from a registered I_T nexus that is not a
2558          * persistent reservation holder (see 5.7.10), the device server shall
2559          * do the following:
2560          *
2561          *     a) Not release the persistent reservation, if any;
2562          *     b) Not remove any registrations; and
2563          *     c) Complete the command with GOOD status.
2564          */
2565         spin_lock(&dev->dev_reservation_lock);
2566         pr_res_holder = dev->dev_pr_res_holder;
2567         if (!pr_res_holder) {
2568                 /*
2569                  * No persistent reservation, return GOOD status.
2570                  */
2571                 spin_unlock(&dev->dev_reservation_lock);
2572                 goto out_put_pr_reg;
2573         }
2574         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2575             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2576                 all_reg = 1;
2577
2578         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2579                 /*
2580                  * Non 'All Registrants' PR Type cases..
2581                  * Release request from a registered I_T nexus that is not a
2582                  * persistent reservation holder. return GOOD status.
2583                  */
2584                 spin_unlock(&dev->dev_reservation_lock);
2585                 goto out_put_pr_reg;
2586         }
2587
2588         /*
2589          * From spc4r17 Section 5.7.11.2 Releasing:
2590          *
2591          * Only the persistent reservation holder (see 5.7.10) is allowed to
2592          * release a persistent reservation.
2593          *
2594          * An application client releases the persistent reservation by issuing
2595          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2596          * an I_T nexus that is a persistent reservation holder with the
2597          * following parameters:
2598          *
2599          *     a) RESERVATION KEY field set to the value of the reservation key
2600          *        that is registered with the logical unit for the I_T nexus;
2601          */
2602         if (res_key != pr_reg->pr_res_key) {
2603                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2604                         " does not match existing SA REGISTER res_key:"
2605                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2606                 spin_unlock(&dev->dev_reservation_lock);
2607                 ret = TCM_RESERVATION_CONFLICT;
2608                 goto out_put_pr_reg;
2609         }
2610         /*
2611          * From spc4r17 Section 5.7.11.2 Releasing and above:
2612          *
2613          * b) TYPE field and SCOPE field set to match the persistent
2614          *    reservation being released.
2615          */
2616         if ((pr_res_holder->pr_res_type != type) ||
2617             (pr_res_holder->pr_res_scope != scope)) {
2618                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2619                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2620                         " reservation from [%s]: %s with different TYPE "
2621                         "and/or SCOPE  while reservation already held by"
2622                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2623                         cmd->se_tfo->get_fabric_name(),
2624                         se_sess->se_node_acl->initiatorname,
2625                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2626                         pr_res_holder->pr_reg_nacl->initiatorname);
2627
2628                 spin_unlock(&dev->dev_reservation_lock);
2629                 ret = TCM_RESERVATION_CONFLICT;
2630                 goto out_put_pr_reg;
2631         }
2632         /*
2633          * In response to a persistent reservation release request from the
2634          * persistent reservation holder the device server shall perform a
2635          * release by doing the following as an uninterrupted series of actions:
2636          * a) Release the persistent reservation;
2637          * b) Not remove any registration(s);
2638          * c) If the released persistent reservation is a registrants only type
2639          * or all registrants type persistent reservation,
2640          *    the device server shall establish a unit attention condition for
2641          *    the initiator port associated with every regis-
2642          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2643          *    RESERVE OUT command with RELEASE service action was received,
2644          *    with the additional sense code set to RESERVATIONS RELEASED; and
2645          * d) If the persistent reservation is of any other type, the device
2646          *    server shall not establish a unit attention condition.
2647          */
2648         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2649                         pr_reg, 1);
2650
2651         spin_unlock(&dev->dev_reservation_lock);
2652
2653         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2654             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2655             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2656             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2657                 /*
2658                  * If no UNIT ATTENTION conditions will be established for
2659                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2660                  * go ahead and check for APTPL=1 update+write below
2661                  */
2662                 goto write_aptpl;
2663         }
2664
2665         spin_lock(&pr_tmpl->registration_lock);
2666         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2667                         pr_reg_list) {
2668                 /*
2669                  * Do not establish a UNIT ATTENTION condition
2670                  * for the calling I_T Nexus
2671                  */
2672                 if (pr_reg_p == pr_reg)
2673                         continue;
2674
2675                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2676                                 pr_reg_p->pr_res_mapped_lun,
2677                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2678         }
2679         spin_unlock(&pr_tmpl->registration_lock);
2680
2681 write_aptpl:
2682         if (pr_tmpl->pr_aptpl_active) {
2683                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
2684                         &pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) {
2685                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2686                 }
2687         }
2688 out_put_pr_reg:
2689         core_scsi3_put_pr_reg(pr_reg);
2690         return ret;
2691 }
2692
2693 static sense_reason_t
2694 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2695 {
2696         struct se_device *dev = cmd->se_dev;
2697         struct se_node_acl *pr_reg_nacl;
2698         struct se_session *se_sess = cmd->se_sess;
2699         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2700         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2701         u32 pr_res_mapped_lun = 0;
2702         int calling_it_nexus = 0;
2703         /*
2704          * Locate the existing *pr_reg via struct se_node_acl pointers
2705          */
2706         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2707                         se_sess->se_node_acl, se_sess);
2708         if (!pr_reg_n) {
2709                 pr_err("SPC-3 PR: Unable to locate"
2710                         " PR_REGISTERED *pr_reg for CLEAR\n");
2711                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2712         }
2713         /*
2714          * From spc4r17 section 5.7.11.6, Clearing:
2715          *
2716          * Any application client may release the persistent reservation and
2717          * remove all registrations from a device server by issuing a
2718          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2719          * registered I_T nexus with the following parameter:
2720          *
2721          *      a) RESERVATION KEY field set to the value of the reservation key
2722          *         that is registered with the logical unit for the I_T nexus.
2723          */
2724         if (res_key != pr_reg_n->pr_res_key) {
2725                 pr_err("SPC-3 PR REGISTER: Received"
2726                         " res_key: 0x%016Lx does not match"
2727                         " existing SA REGISTER res_key:"
2728                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2729                 core_scsi3_put_pr_reg(pr_reg_n);
2730                 return TCM_RESERVATION_CONFLICT;
2731         }
2732         /*
2733          * a) Release the persistent reservation, if any;
2734          */
2735         spin_lock(&dev->dev_reservation_lock);
2736         pr_res_holder = dev->dev_pr_res_holder;
2737         if (pr_res_holder) {
2738                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2739                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2740                         pr_res_holder, 0);
2741         }
2742         spin_unlock(&dev->dev_reservation_lock);
2743         /*
2744          * b) Remove all registration(s) (see spc4r17 5.7.7);
2745          */
2746         spin_lock(&pr_tmpl->registration_lock);
2747         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2748                         &pr_tmpl->registration_list, pr_reg_list) {
2749
2750                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2751                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2752                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2753                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2754                                         calling_it_nexus);
2755                 /*
2756                  * e) Establish a unit attention condition for the initiator
2757                  *    port associated with every registered I_T nexus other
2758                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2759                  *    command with CLEAR service action was received, with the
2760                  *    additional sense code set to RESERVATIONS PREEMPTED.
2761                  */
2762                 if (!calling_it_nexus)
2763                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2764                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2765         }
2766         spin_unlock(&pr_tmpl->registration_lock);
2767
2768         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2769                 cmd->se_tfo->get_fabric_name());
2770
2771         if (pr_tmpl->pr_aptpl_active) {
2772                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2773                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2774                                 " for CLEAR\n");
2775         }
2776
2777         core_scsi3_pr_generation(dev);
2778         return 0;
2779 }
2780
2781 /*
2782  * Called with struct se_device->dev_reservation_lock held.
2783  */
2784 static void __core_scsi3_complete_pro_preempt(
2785         struct se_device *dev,
2786         struct t10_pr_registration *pr_reg,
2787         struct list_head *preempt_and_abort_list,
2788         int type,
2789         int scope,
2790         enum preempt_type preempt_type)
2791 {
2792         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2793         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2794         char i_buf[PR_REG_ISID_ID_LEN];
2795
2796         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2797         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2798         /*
2799          * Do an implict RELEASE of the existing reservation.
2800          */
2801         if (dev->dev_pr_res_holder)
2802                 __core_scsi3_complete_pro_release(dev, nacl,
2803                                 dev->dev_pr_res_holder, 0);
2804
2805         dev->dev_pr_res_holder = pr_reg;
2806         pr_reg->pr_res_holder = 1;
2807         pr_reg->pr_res_type = type;
2808         pr_reg->pr_res_scope = scope;
2809
2810         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2811                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2812                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2813                 core_scsi3_pr_dump_type(type),
2814                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2815         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2816                 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2817                 nacl->initiatorname, i_buf);
2818         /*
2819          * For PREEMPT_AND_ABORT, add the preempting reservation's
2820          * struct t10_pr_registration to the list that will be compared
2821          * against received CDBs..
2822          */
2823         if (preempt_and_abort_list)
2824                 list_add_tail(&pr_reg->pr_reg_abort_list,
2825                                 preempt_and_abort_list);
2826 }
2827
2828 static void core_scsi3_release_preempt_and_abort(
2829         struct list_head *preempt_and_abort_list,
2830         struct t10_pr_registration *pr_reg_holder)
2831 {
2832         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2833
2834         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2835                                 pr_reg_abort_list) {
2836
2837                 list_del(&pr_reg->pr_reg_abort_list);
2838                 if (pr_reg_holder == pr_reg)
2839                         continue;
2840                 if (pr_reg->pr_res_holder) {
2841                         pr_warn("pr_reg->pr_res_holder still set\n");
2842                         continue;
2843                 }
2844
2845                 pr_reg->pr_reg_deve = NULL;
2846                 pr_reg->pr_reg_nacl = NULL;
2847                 kfree(pr_reg->pr_aptpl_buf);
2848                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2849         }
2850 }
2851
2852 static sense_reason_t
2853 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2854                 u64 sa_res_key, enum preempt_type preempt_type)
2855 {
2856         struct se_device *dev = cmd->se_dev;
2857         struct se_node_acl *pr_reg_nacl;
2858         struct se_session *se_sess = cmd->se_sess;
2859         LIST_HEAD(preempt_and_abort_list);
2860         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2861         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2862         u32 pr_res_mapped_lun = 0;
2863         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2864         int prh_type = 0, prh_scope = 0;
2865
2866         if (!se_sess)
2867                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2868
2869         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2870                                 se_sess);
2871         if (!pr_reg_n) {
2872                 pr_err("SPC-3 PR: Unable to locate"
2873                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2874                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2875                 return TCM_RESERVATION_CONFLICT;
2876         }
2877         if (pr_reg_n->pr_res_key != res_key) {
2878                 core_scsi3_put_pr_reg(pr_reg_n);
2879                 return TCM_RESERVATION_CONFLICT;
2880         }
2881         if (scope != PR_SCOPE_LU_SCOPE) {
2882                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2883                 core_scsi3_put_pr_reg(pr_reg_n);
2884                 return TCM_INVALID_PARAMETER_LIST;
2885         }
2886
2887         spin_lock(&dev->dev_reservation_lock);
2888         pr_res_holder = dev->dev_pr_res_holder;
2889         if (pr_res_holder &&
2890            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2891             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2892                 all_reg = 1;
2893
2894         if (!all_reg && !sa_res_key) {
2895                 spin_unlock(&dev->dev_reservation_lock);
2896                 core_scsi3_put_pr_reg(pr_reg_n);
2897                 return TCM_INVALID_PARAMETER_LIST;
2898         }
2899         /*
2900          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2901          *
2902          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2903          * persistent reservation holder or there is no persistent reservation
2904          * holder (i.e., there is no persistent reservation), then the device
2905          * server shall perform a preempt by doing the following in an
2906          * uninterrupted series of actions. (See below..)
2907          */
2908         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2909                 /*
2910                  * No existing or SA Reservation Key matching reservations..
2911                  *
2912                  * PROUT SA PREEMPT with All Registrant type reservations are
2913                  * allowed to be processed without a matching SA Reservation Key
2914                  */
2915                 spin_lock(&pr_tmpl->registration_lock);
2916                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2917                                 &pr_tmpl->registration_list, pr_reg_list) {
2918                         /*
2919                          * Removing of registrations in non all registrants
2920                          * type reservations without a matching SA reservation
2921                          * key.
2922                          *
2923                          * a) Remove the registrations for all I_T nexuses
2924                          *    specified by the SERVICE ACTION RESERVATION KEY
2925                          *    field;
2926                          * b) Ignore the contents of the SCOPE and TYPE fields;
2927                          * c) Process tasks as defined in 5.7.1; and
2928                          * d) Establish a unit attention condition for the
2929                          *    initiator port associated with every I_T nexus
2930                          *    that lost its registration other than the I_T
2931                          *    nexus on which the PERSISTENT RESERVE OUT command
2932                          *    was received, with the additional sense code set
2933                          *    to REGISTRATIONS PREEMPTED.
2934                          */
2935                         if (!all_reg) {
2936                                 if (pr_reg->pr_res_key != sa_res_key)
2937                                         continue;
2938
2939                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2940                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2941                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2942                                 __core_scsi3_free_registration(dev, pr_reg,
2943                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2944                                                 NULL, calling_it_nexus);
2945                                 released_regs++;
2946                         } else {
2947                                 /*
2948                                  * Case for any existing all registrants type
2949                                  * reservation, follow logic in spc4r17 section
2950                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2951                                  *
2952                                  * For a ZERO SA Reservation key, release
2953                                  * all other registrations and do an implict
2954                                  * release of active persistent reservation.
2955                                  *
2956                                  * For a non-ZERO SA Reservation key, only
2957                                  * release the matching reservation key from
2958                                  * registrations.
2959                                  */
2960                                 if ((sa_res_key) &&
2961                                      (pr_reg->pr_res_key != sa_res_key))
2962                                         continue;
2963
2964                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2965                                 if (calling_it_nexus)
2966                                         continue;
2967
2968                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2969                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2970                                 __core_scsi3_free_registration(dev, pr_reg,
2971                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2972                                                 NULL, 0);
2973                                 released_regs++;
2974                         }
2975                         if (!calling_it_nexus)
2976                                 core_scsi3_ua_allocate(pr_reg_nacl,
2977                                         pr_res_mapped_lun, 0x2A,
2978                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2979                 }
2980                 spin_unlock(&pr_tmpl->registration_lock);
2981                 /*
2982                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2983                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2984                  * RESERVATION KEY field to a value that does not match any
2985                  * registered reservation key, then the device server shall
2986                  * complete the command with RESERVATION CONFLICT status.
2987                  */
2988                 if (!released_regs) {
2989                         spin_unlock(&dev->dev_reservation_lock);
2990                         core_scsi3_put_pr_reg(pr_reg_n);
2991                         return TCM_RESERVATION_CONFLICT;
2992                 }
2993                 /*
2994                  * For an existing all registrants type reservation
2995                  * with a zero SA rservation key, preempt the existing
2996                  * reservation with the new PR type and scope.
2997                  */
2998                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2999                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3000                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3001                                 type, scope, preempt_type);
3002
3003                         if (preempt_type == PREEMPT_AND_ABORT)
3004                                 core_scsi3_release_preempt_and_abort(
3005                                         &preempt_and_abort_list, pr_reg_n);
3006                 }
3007                 spin_unlock(&dev->dev_reservation_lock);
3008
3009                 if (pr_tmpl->pr_aptpl_active) {
3010                         if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3011                                         &pr_reg_n->pr_aptpl_buf[0],
3012                                         pr_tmpl->pr_aptpl_buf_len)) {
3013                                 pr_debug("SPC-3 PR: Updated APTPL"
3014                                         " metadata for  PREEMPT%s\n", (preempt_type == PREEMPT_AND_ABORT) ?
3015                                         "_AND_ABORT" : "");
3016                         }
3017                 }
3018
3019                 core_scsi3_put_pr_reg(pr_reg_n);
3020                 core_scsi3_pr_generation(cmd->se_dev);
3021                 return 0;
3022         }
3023         /*
3024          * The PREEMPTing SA reservation key matches that of the
3025          * existing persistent reservation, first, we check if
3026          * we are preempting our own reservation.
3027          * From spc4r17, section 5.7.11.4.3 Preempting
3028          * persistent reservations and registration handling
3029          *
3030          * If an all registrants persistent reservation is not
3031          * present, it is not an error for the persistent
3032          * reservation holder to preempt itself (i.e., a
3033          * PERSISTENT RESERVE OUT with a PREEMPT service action
3034          * or a PREEMPT AND ABORT service action with the
3035          * SERVICE ACTION RESERVATION KEY value equal to the
3036          * persistent reservation holder's reservation key that
3037          * is received from the persistent reservation holder).
3038          * In that case, the device server shall establish the
3039          * new persistent reservation and maintain the
3040          * registration.
3041          */
3042         prh_type = pr_res_holder->pr_res_type;
3043         prh_scope = pr_res_holder->pr_res_scope;
3044         /*
3045          * If the SERVICE ACTION RESERVATION KEY field identifies a
3046          * persistent reservation holder (see 5.7.10), the device
3047          * server shall perform a preempt by doing the following as
3048          * an uninterrupted series of actions:
3049          *
3050          * a) Release the persistent reservation for the holder
3051          *    identified by the SERVICE ACTION RESERVATION KEY field;
3052          */
3053         if (pr_reg_n != pr_res_holder)
3054                 __core_scsi3_complete_pro_release(dev,
3055                                 pr_res_holder->pr_reg_nacl,
3056                                 dev->dev_pr_res_holder, 0);
3057         /*
3058          * b) Remove the registrations for all I_T nexuses identified
3059          *    by the SERVICE ACTION RESERVATION KEY field, except the
3060          *    I_T nexus that is being used for the PERSISTENT RESERVE
3061          *    OUT command. If an all registrants persistent reservation
3062          *    is present and the SERVICE ACTION RESERVATION KEY field
3063          *    is set to zero, then all registrations shall be removed
3064          *    except for that of the I_T nexus that is being used for
3065          *    the PERSISTENT RESERVE OUT command;
3066          */
3067         spin_lock(&pr_tmpl->registration_lock);
3068         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3069                         &pr_tmpl->registration_list, pr_reg_list) {
3070
3071                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3072                 if (calling_it_nexus)
3073                         continue;
3074
3075                 if (pr_reg->pr_res_key != sa_res_key)
3076                         continue;
3077
3078                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3079                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3080                 __core_scsi3_free_registration(dev, pr_reg,
3081                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3082                                 calling_it_nexus);
3083                 /*
3084                  * e) Establish a unit attention condition for the initiator
3085                  *    port associated with every I_T nexus that lost its
3086                  *    persistent reservation and/or registration, with the
3087                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3088                  */
3089                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3090                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3091         }
3092         spin_unlock(&pr_tmpl->registration_lock);
3093         /*
3094          * c) Establish a persistent reservation for the preempting
3095          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3096          */
3097         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3098                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3099                         type, scope, preempt_type);
3100         /*
3101          * d) Process tasks as defined in 5.7.1;
3102          * e) See above..
3103          * f) If the type or scope has changed, then for every I_T nexus
3104          *    whose reservation key was not removed, except for the I_T
3105          *    nexus on which the PERSISTENT RESERVE OUT command was
3106          *    received, the device server shall establish a unit
3107          *    attention condition for the initiator port associated with
3108          *    that I_T nexus, with the additional sense code set to
3109          *    RESERVATIONS RELEASED. If the type or scope have not
3110          *    changed, then no unit attention condition(s) shall be
3111          *    established for this reason.
3112          */
3113         if ((prh_type != type) || (prh_scope != scope)) {
3114                 spin_lock(&pr_tmpl->registration_lock);
3115                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3116                                 &pr_tmpl->registration_list, pr_reg_list) {
3117
3118                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3119                         if (calling_it_nexus)
3120                                 continue;
3121
3122                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3123                                         pr_reg->pr_res_mapped_lun, 0x2A,
3124                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3125                 }
3126                 spin_unlock(&pr_tmpl->registration_lock);
3127         }
3128         spin_unlock(&dev->dev_reservation_lock);
3129         /*
3130          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3131          * All received CDBs for the matching existing reservation and
3132          * registrations undergo ABORT_TASK logic.
3133          *
3134          * From there, core_scsi3_release_preempt_and_abort() will
3135          * release every registration in the list (which have already
3136          * been removed from the primary pr_reg list), except the
3137          * new persistent reservation holder, the calling Initiator Port.
3138          */
3139         if (preempt_type == PREEMPT_AND_ABORT) {
3140                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3141                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3142                                                 pr_reg_n);
3143         }
3144
3145         if (pr_tmpl->pr_aptpl_active) {
3146                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3147                                 &pr_reg_n->pr_aptpl_buf[0],
3148                                 pr_tmpl->pr_aptpl_buf_len)) {
3149                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3150                                 "%s\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
3151                 }
3152         }
3153
3154         core_scsi3_put_pr_reg(pr_reg_n);
3155         core_scsi3_pr_generation(cmd->se_dev);
3156         return 0;
3157 }
3158
3159 static sense_reason_t
3160 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3161                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3162 {
3163         switch (type) {
3164         case PR_TYPE_WRITE_EXCLUSIVE:
3165         case PR_TYPE_EXCLUSIVE_ACCESS:
3166         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3167         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3168         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3169         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3170                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3171                                               sa_res_key, preempt_type);
3172         default:
3173                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3174                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3175                 return TCM_INVALID_CDB_FIELD;
3176         }
3177 }
3178
3179
3180 static sense_reason_t
3181 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3182                 u64 sa_res_key, int aptpl, int unreg)
3183 {
3184         struct se_session *se_sess = cmd->se_sess;
3185         struct se_device *dev = cmd->se_dev;
3186         struct se_dev_entry *dest_se_deve = NULL;
3187         struct se_lun *se_lun = cmd->se_lun;
3188         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3189         struct se_port *se_port;
3190         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3191         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3192         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3193         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3194         unsigned char *buf;
3195         unsigned char *initiator_str;
3196         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3197         u32 tid_len, tmp_tid_len;
3198         int new_reg = 0, type, scope, matching_iname;
3199         sense_reason_t ret;
3200         unsigned short rtpi;
3201         unsigned char proto_ident;
3202
3203         if (!se_sess || !se_lun) {
3204                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3205                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3206         }
3207
3208         memset(dest_iport, 0, 64);
3209         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3210         se_tpg = se_sess->se_tpg;
3211         tf_ops = se_tpg->se_tpg_tfo;
3212         /*
3213          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3214          *      Register behaviors for a REGISTER AND MOVE service action
3215          *
3216          * Locate the existing *pr_reg via struct se_node_acl pointers
3217          */
3218         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3219                                 se_sess);
3220         if (!pr_reg) {
3221                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3222                         " *pr_reg for REGISTER_AND_MOVE\n");
3223                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3224         }
3225         /*
3226          * The provided reservation key much match the existing reservation key
3227          * provided during this initiator's I_T nexus registration.
3228          */
3229         if (res_key != pr_reg->pr_res_key) {
3230                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3231                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3232                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3233                 ret = TCM_RESERVATION_CONFLICT;
3234                 goto out_put_pr_reg;
3235         }
3236         /*
3237          * The service active reservation key needs to be non zero
3238          */
3239         if (!sa_res_key) {
3240                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3241                         " sa_res_key\n");
3242                 ret = TCM_INVALID_PARAMETER_LIST;
3243                 goto out_put_pr_reg;
3244         }
3245
3246         /*
3247          * Determine the Relative Target Port Identifier where the reservation
3248          * will be moved to for the TransportID containing SCSI initiator WWN
3249          * information.
3250          */
3251         buf = transport_kmap_data_sg(cmd);
3252         if (!buf) {
3253                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3254                 goto out_put_pr_reg;
3255         }
3256
3257         rtpi = (buf[18] & 0xff) << 8;
3258         rtpi |= buf[19] & 0xff;
3259         tid_len = (buf[20] & 0xff) << 24;
3260         tid_len |= (buf[21] & 0xff) << 16;
3261         tid_len |= (buf[22] & 0xff) << 8;
3262         tid_len |= buf[23] & 0xff;
3263         transport_kunmap_data_sg(cmd);
3264         buf = NULL;
3265
3266         if ((tid_len + 24) != cmd->data_length) {
3267                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3268                         " does not equal CDB data_length: %u\n", tid_len,
3269                         cmd->data_length);
3270                 ret = TCM_INVALID_PARAMETER_LIST;
3271                 goto out_put_pr_reg;
3272         }
3273
3274         spin_lock(&dev->se_port_lock);
3275         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3276                 if (se_port->sep_rtpi != rtpi)
3277                         continue;
3278                 dest_se_tpg = se_port->sep_tpg;
3279                 if (!dest_se_tpg)
3280                         continue;
3281                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3282                 if (!dest_tf_ops)
3283                         continue;
3284
3285                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3286                 smp_mb__after_atomic_inc();
3287                 spin_unlock(&dev->se_port_lock);
3288
3289                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3290                         pr_err("core_scsi3_tpg_depend_item() failed"
3291                                 " for dest_se_tpg\n");
3292                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3293                         smp_mb__after_atomic_dec();
3294                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3295                         goto out_put_pr_reg;
3296                 }
3297
3298                 spin_lock(&dev->se_port_lock);
3299                 break;
3300         }
3301         spin_unlock(&dev->se_port_lock);
3302
3303         if (!dest_se_tpg || !dest_tf_ops) {
3304                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3305                         " fabric ops from Relative Target Port Identifier:"
3306                         " %hu\n", rtpi);
3307                 ret = TCM_INVALID_PARAMETER_LIST;
3308                 goto out_put_pr_reg;
3309         }
3310
3311         buf = transport_kmap_data_sg(cmd);
3312         if (!buf) {
3313                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3314                 goto out_put_pr_reg;
3315         }
3316         proto_ident = (buf[24] & 0x0f);
3317
3318         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3319                         " 0x%02x\n", proto_ident);
3320
3321         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3322                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3323                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3324                         " from fabric: %s\n", proto_ident,
3325                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3326                         dest_tf_ops->get_fabric_name());
3327                 ret = TCM_INVALID_PARAMETER_LIST;
3328                 goto out;
3329         }
3330         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3331                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3332                         " containg a valid tpg_parse_pr_out_transport_id"
3333                         " function pointer\n");
3334                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3335                 goto out;
3336         }
3337         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3338                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3339         if (!initiator_str) {
3340                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3341                         " initiator_str from Transport ID\n");
3342                 ret = TCM_INVALID_PARAMETER_LIST;
3343                 goto out;
3344         }
3345
3346         transport_kunmap_data_sg(cmd);
3347         buf = NULL;
3348
3349         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3350                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3351                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3352                 iport_ptr : "");
3353         /*
3354          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3355          * action specifies a TransportID that is the same as the initiator port
3356          * of the I_T nexus for the command received, then the command shall
3357          * be terminated with CHECK CONDITION status, with the sense key set to
3358          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3359          * IN PARAMETER LIST.
3360          */
3361         pr_reg_nacl = pr_reg->pr_reg_nacl;
3362         matching_iname = (!strcmp(initiator_str,
3363                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3364         if (!matching_iname)
3365                 goto after_iport_check;
3366
3367         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3368                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3369                         " matches: %s on received I_T Nexus\n", initiator_str,
3370                         pr_reg_nacl->initiatorname);
3371                 ret = TCM_INVALID_PARAMETER_LIST;
3372                 goto out;
3373         }
3374         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3375                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3376                         " matches: %s %s on received I_T Nexus\n",
3377                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3378                         pr_reg->pr_reg_isid);
3379                 ret = TCM_INVALID_PARAMETER_LIST;
3380                 goto out;
3381         }
3382 after_iport_check:
3383         /*
3384          * Locate the destination struct se_node_acl from the received Transport ID
3385          */
3386         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3387         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3388                                 initiator_str);
3389         if (dest_node_acl) {
3390                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3391                 smp_mb__after_atomic_inc();
3392         }
3393         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3394
3395         if (!dest_node_acl) {
3396                 pr_err("Unable to locate %s dest_node_acl for"
3397                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3398                         initiator_str);
3399                 ret = TCM_INVALID_PARAMETER_LIST;
3400                 goto out;
3401         }
3402
3403         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3404                 pr_err("core_scsi3_nodeacl_depend_item() for"
3405                         " dest_node_acl\n");
3406                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3407                 smp_mb__after_atomic_dec();
3408                 dest_node_acl = NULL;
3409                 ret = TCM_INVALID_PARAMETER_LIST;
3410                 goto out;
3411         }
3412
3413         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3414                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3415                 dest_node_acl->initiatorname);
3416
3417         /*
3418          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3419          * PORT IDENTIFIER.
3420          */
3421         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3422         if (!dest_se_deve) {
3423                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3424                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3425                 ret = TCM_INVALID_PARAMETER_LIST;
3426                 goto out;
3427         }
3428
3429         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3430                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3431                 atomic_dec(&dest_se_deve->pr_ref_count);
3432                 smp_mb__after_atomic_dec();
3433                 dest_se_deve = NULL;
3434                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3435                 goto out;
3436         }
3437
3438         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3439                 " ACL for dest_se_deve->mapped_lun: %u\n",
3440                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3441                 dest_se_deve->mapped_lun);
3442
3443         /*
3444          * A persistent reservation needs to already existing in order to
3445          * successfully complete the REGISTER_AND_MOVE service action..
3446          */
3447         spin_lock(&dev->dev_reservation_lock);
3448         pr_res_holder = dev->dev_pr_res_holder;
3449         if (!pr_res_holder) {
3450                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3451                         " currently held\n");
3452                 spin_unlock(&dev->dev_reservation_lock);
3453                 ret = TCM_INVALID_CDB_FIELD;
3454                 goto out;
3455         }
3456         /*
3457          * The received on I_T Nexus must be the reservation holder.
3458          *
3459          * From spc4r17 section 5.7.8  Table 50 --
3460          *      Register behaviors for a REGISTER AND MOVE service action
3461          */
3462         if (pr_res_holder != pr_reg) {
3463                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3464                         " Nexus is not reservation holder\n");
3465                 spin_unlock(&dev->dev_reservation_lock);
3466                 ret = TCM_RESERVATION_CONFLICT;
3467                 goto out;
3468         }
3469         /*
3470          * From spc4r17 section 5.7.8: registering and moving reservation
3471          *
3472          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3473          * action is received and the established persistent reservation is a
3474          * Write Exclusive - All Registrants type or Exclusive Access -
3475          * All Registrants type reservation, then the command shall be completed
3476          * with RESERVATION CONFLICT status.
3477          */
3478         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3479             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3480                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3481                         " reservation for type: %s\n",
3482                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3483                 spin_unlock(&dev->dev_reservation_lock);
3484                 ret = TCM_RESERVATION_CONFLICT;
3485                 goto out;
3486         }
3487         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3488         /*
3489          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3490          */
3491         type = pr_res_holder->pr_res_type;
3492         scope = pr_res_holder->pr_res_type;
3493         /*
3494          * c) Associate the reservation key specified in the SERVICE ACTION
3495          *    RESERVATION KEY field with the I_T nexus specified as the
3496          *    destination of the register and move, where:
3497          *    A) The I_T nexus is specified by the TransportID and the
3498          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3499          *    B) Regardless of the TransportID format used, the association for
3500          *       the initiator port is based on either the initiator port name
3501          *       (see 3.1.71) on SCSI transport protocols where port names are
3502          *       required or the initiator port identifier (see 3.1.70) on SCSI
3503          *       transport protocols where port names are not required;
3504          * d) Register the reservation key specified in the SERVICE ACTION
3505          *    RESERVATION KEY field;
3506          * e) Retain the reservation key specified in the SERVICE ACTION
3507          *    RESERVATION KEY field and associated information;
3508          *
3509          * Also, It is not an error for a REGISTER AND MOVE service action to
3510          * register an I_T nexus that is already registered with the same
3511          * reservation key or a different reservation key.
3512          */
3513         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3514                                         iport_ptr);
3515         if (!dest_pr_reg) {
3516                 if (core_scsi3_alloc_registration(cmd->se_dev,
3517                                 dest_node_acl, dest_se_deve, iport_ptr,
3518                                 sa_res_key, 0, aptpl, 2, 1)) {
3519                         spin_unlock(&dev->dev_reservation_lock);
3520                         ret = TCM_INVALID_PARAMETER_LIST;
3521                         goto out;
3522                 }
3523                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3524                                                 iport_ptr);
3525                 new_reg = 1;
3526         }
3527         /*
3528          * f) Release the persistent reservation for the persistent reservation
3529          *    holder (i.e., the I_T nexus on which the
3530          */
3531         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3532                         dev->dev_pr_res_holder, 0);
3533         /*
3534          * g) Move the persistent reservation to the specified I_T nexus using
3535          *    the same scope and type as the persistent reservation released in
3536          *    item f); and
3537          */
3538         dev->dev_pr_res_holder = dest_pr_reg;
3539         dest_pr_reg->pr_res_holder = 1;
3540         dest_pr_reg->pr_res_type = type;
3541         pr_reg->pr_res_scope = scope;
3542         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3543         /*
3544          * Increment PRGeneration for existing registrations..
3545          */
3546         if (!new_reg)
3547                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3548         spin_unlock(&dev->dev_reservation_lock);
3549
3550         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3551                 " created new reservation holder TYPE: %s on object RTPI:"
3552                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3553                 core_scsi3_pr_dump_type(type), rtpi,
3554                 dest_pr_reg->pr_res_generation);
3555         pr_debug("SPC-3 PR Successfully moved reservation from"
3556                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3557                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3558                 i_buf, dest_tf_ops->get_fabric_name(),
3559                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3560                 iport_ptr : "");
3561         /*
3562          * It is now safe to release configfs group dependencies for destination
3563          * of Transport ID Initiator Device/Port Identifier
3564          */
3565         core_scsi3_lunacl_undepend_item(dest_se_deve);
3566         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3567         core_scsi3_tpg_undepend_item(dest_se_tpg);
3568         /*
3569          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3570          * nexus on which PERSISTENT RESERVE OUT command was received.
3571          */
3572         if (unreg) {
3573                 spin_lock(&pr_tmpl->registration_lock);
3574                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3575                 spin_unlock(&pr_tmpl->registration_lock);
3576         } else
3577                 core_scsi3_put_pr_reg(pr_reg);
3578
3579         /*
3580          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3581          * write out the updated metadata to struct file for this SCSI device.
3582          */
3583         if (!aptpl) {
3584                 pr_tmpl->pr_aptpl_active = 0;
3585                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3586                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3587                                 " REGISTER_AND_MOVE\n");
3588         } else {
3589                 pr_tmpl->pr_aptpl_active = 1;
3590                 if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
3591                                 &dest_pr_reg->pr_aptpl_buf[0],
3592                                 pr_tmpl->pr_aptpl_buf_len)) {
3593                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3594                                         " REGISTER_AND_MOVE\n");
3595                 }
3596         }
3597
3598         transport_kunmap_data_sg(cmd);
3599
3600         core_scsi3_put_pr_reg(dest_pr_reg);
3601         return 0;
3602 out:
3603         if (buf)
3604                 transport_kunmap_data_sg(cmd);
3605         if (dest_se_deve)
3606                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3607         if (dest_node_acl)
3608                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3609         core_scsi3_tpg_undepend_item(dest_se_tpg);
3610
3611 out_put_pr_reg:
3612         core_scsi3_put_pr_reg(pr_reg);
3613         return ret;
3614 }
3615
3616 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3617 {
3618         unsigned int __v1, __v2;
3619
3620         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3621         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3622
3623         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3624 }
3625
3626 /*
3627  * See spc4r17 section 6.14 Table 170
3628  */
3629 sense_reason_t
3630 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3631 {
3632         unsigned char *cdb = &cmd->t_task_cdb[0];
3633         unsigned char *buf;
3634         u64 res_key, sa_res_key;
3635         int sa, scope, type, aptpl;
3636         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3637         sense_reason_t ret;
3638
3639         /*
3640          * Following spc2r20 5.5.1 Reservations overview:
3641          *
3642          * If a logical unit has been reserved by any RESERVE command and is
3643          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3644          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3645          * initiator or service action and shall terminate with a RESERVATION
3646          * CONFLICT status.
3647          */
3648         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3649                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3650                         " SPC-2 reservation is held, returning"
3651                         " RESERVATION_CONFLICT\n");
3652                 return TCM_RESERVATION_CONFLICT;
3653         }
3654
3655         /*
3656          * FIXME: A NULL struct se_session pointer means an this is not coming from
3657          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3658          */
3659         if (!cmd->se_sess)
3660                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3661
3662         if (cmd->data_length < 24) {
3663                 pr_warn("SPC-PR: Received PR OUT parameter list"
3664                         " length too small: %u\n", cmd->data_length);
3665                 return TCM_INVALID_PARAMETER_LIST;
3666         }
3667
3668         /*
3669          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3670          */
3671         sa = (cdb[1] & 0x1f);
3672         scope = (cdb[2] & 0xf0);
3673         type = (cdb[2] & 0x0f);
3674
3675         buf = transport_kmap_data_sg(cmd);
3676         if (!buf)
3677                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3678
3679         /*
3680          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3681          */
3682         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3683         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3684         /*
3685          * REGISTER_AND_MOVE uses a different SA parameter list containing
3686          * SCSI TransportIDs.
3687          */
3688         if (sa != PRO_REGISTER_AND_MOVE) {
3689                 spec_i_pt = (buf[20] & 0x08);
3690                 all_tg_pt = (buf[20] & 0x04);
3691                 aptpl = (buf[20] & 0x01);
3692         } else {
3693                 aptpl = (buf[17] & 0x01);
3694                 unreg = (buf[17] & 0x02);
3695         }
3696         transport_kunmap_data_sg(cmd);
3697         buf = NULL;
3698
3699         /*
3700          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3701          */
3702         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3703                 return TCM_INVALID_PARAMETER_LIST;
3704
3705         /*
3706          * From spc4r17 section 6.14:
3707          *
3708          * If the SPEC_I_PT bit is set to zero, the service action is not
3709          * REGISTER AND MOVE, and the parameter list length is not 24, then
3710          * the command shall be terminated with CHECK CONDITION status, with
3711          * the sense key set to ILLEGAL REQUEST, and the additional sense
3712          * code set to PARAMETER LIST LENGTH ERROR.
3713          */
3714         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3715             (cmd->data_length != 24)) {
3716                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3717                         " list length: %u\n", cmd->data_length);
3718                 return TCM_INVALID_PARAMETER_LIST;
3719         }
3720
3721         /*
3722          * (core_scsi3_emulate_pro_* function parameters
3723          * are defined by spc4r17 Table 174:
3724          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3725          */
3726         switch (sa) {
3727         case PRO_REGISTER:
3728                 ret = core_scsi3_emulate_pro_register(cmd,
3729                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3730                 break;
3731         case PRO_RESERVE:
3732                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3733                 break;
3734         case PRO_RELEASE:
3735                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3736                 break;
3737         case PRO_CLEAR:
3738                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3739                 break;
3740         case PRO_PREEMPT:
3741                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3742                                         res_key, sa_res_key, PREEMPT);
3743                 break;
3744         case PRO_PREEMPT_AND_ABORT:
3745                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3746                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3747                 break;
3748         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3749                 ret = core_scsi3_emulate_pro_register(cmd,
3750                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3751                 break;
3752         case PRO_REGISTER_AND_MOVE:
3753                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3754                                 sa_res_key, aptpl, unreg);
3755                 break;
3756         default:
3757                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3758                         " action: 0x%02x\n", cdb[1] & 0x1f);
3759                 return TCM_INVALID_CDB_FIELD;
3760         }
3761
3762         if (!ret)
3763                 target_complete_cmd(cmd, GOOD);
3764         return ret;
3765 }
3766
3767 /*
3768  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3769  *
3770  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3771  */
3772 static sense_reason_t
3773 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3774 {
3775         struct se_device *dev = cmd->se_dev;
3776         struct t10_pr_registration *pr_reg;
3777         unsigned char *buf;
3778         u32 add_len = 0, off = 8;
3779
3780         if (cmd->data_length < 8) {
3781                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3782                         " too small\n", cmd->data_length);
3783                 return TCM_INVALID_CDB_FIELD;
3784         }
3785
3786         buf = transport_kmap_data_sg(cmd);
3787         if (!buf)
3788                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3789
3790         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3791         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3792         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3793         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3794
3795         spin_lock(&dev->t10_pr.registration_lock);
3796         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3797                         pr_reg_list) {
3798                 /*
3799                  * Check for overflow of 8byte PRI READ_KEYS payload and
3800                  * next reservation key list descriptor.
3801                  */
3802                 if ((add_len + 8) > (cmd->data_length - 8))
3803                         break;
3804
3805                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3806                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3807                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3808                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3809                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3810                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3811                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3812                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3813
3814                 add_len += 8;
3815         }
3816         spin_unlock(&dev->t10_pr.registration_lock);
3817
3818         buf[4] = ((add_len >> 24) & 0xff);
3819         buf[5] = ((add_len >> 16) & 0xff);
3820         buf[6] = ((add_len >> 8) & 0xff);
3821         buf[7] = (add_len & 0xff);
3822
3823         transport_kunmap_data_sg(cmd);
3824
3825         return 0;
3826 }
3827
3828 /*
3829  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3830  *
3831  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3832  */
3833 static sense_reason_t
3834 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3835 {
3836         struct se_device *dev = cmd->se_dev;
3837         struct t10_pr_registration *pr_reg;
3838         unsigned char *buf;
3839         u64 pr_res_key;
3840         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3841
3842         if (cmd->data_length < 8) {
3843                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3844                         " too small\n", cmd->data_length);
3845                 return TCM_INVALID_CDB_FIELD;
3846         }
3847
3848         buf = transport_kmap_data_sg(cmd);
3849         if (!buf)
3850                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3851
3852         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3853         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3854         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3855         buf[3] = (dev->t10_pr.pr_generation & 0xff);
3856
3857         spin_lock(&dev->dev_reservation_lock);
3858         pr_reg = dev->dev_pr_res_holder;
3859         if (pr_reg) {
3860                 /*
3861                  * Set the hardcoded Additional Length
3862                  */
3863                 buf[4] = ((add_len >> 24) & 0xff);
3864                 buf[5] = ((add_len >> 16) & 0xff);
3865                 buf[6] = ((add_len >> 8) & 0xff);
3866                 buf[7] = (add_len & 0xff);
3867
3868                 if (cmd->data_length < 22)
3869                         goto err;
3870
3871                 /*
3872                  * Set the Reservation key.
3873                  *
3874                  * From spc4r17, section 5.7.10:
3875                  * A persistent reservation holder has its reservation key
3876                  * returned in the parameter data from a PERSISTENT
3877                  * RESERVE IN command with READ RESERVATION service action as
3878                  * follows:
3879                  * a) For a persistent reservation of the type Write Exclusive
3880                  *    - All Registrants or Exclusive Access  All Regitrants,
3881                  *      the reservation key shall be set to zero; or
3882                  * b) For all other persistent reservation types, the
3883                  *    reservation key shall be set to the registered
3884                  *    reservation key for the I_T nexus that holds the
3885                  *    persistent reservation.
3886                  */
3887                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3888                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3889                         pr_res_key = 0;
3890                 else
3891                         pr_res_key = pr_reg->pr_res_key;
3892
3893                 buf[8] = ((pr_res_key >> 56) & 0xff);
3894                 buf[9] = ((pr_res_key >> 48) & 0xff);
3895                 buf[10] = ((pr_res_key >> 40) & 0xff);
3896                 buf[11] = ((pr_res_key >> 32) & 0xff);
3897                 buf[12] = ((pr_res_key >> 24) & 0xff);
3898                 buf[13] = ((pr_res_key >> 16) & 0xff);
3899                 buf[14] = ((pr_res_key >> 8) & 0xff);
3900                 buf[15] = (pr_res_key & 0xff);
3901                 /*
3902                  * Set the SCOPE and TYPE
3903                  */
3904                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3905                           (pr_reg->pr_res_type & 0x0f);
3906         }
3907
3908 err:
3909         spin_unlock(&dev->dev_reservation_lock);
3910         transport_kunmap_data_sg(cmd);
3911
3912         return 0;
3913 }
3914
3915 /*
3916  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3917  *
3918  * See spc4r17 section 6.13.4 Table 165
3919  */
3920 static sense_reason_t
3921 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3922 {
3923         struct se_device *dev = cmd->se_dev;
3924         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3925         unsigned char *buf;
3926         u16 add_len = 8; /* Hardcoded to 8. */
3927
3928         if (cmd->data_length < 6) {
3929                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3930                         " %u too small\n", cmd->data_length);
3931                 return TCM_INVALID_CDB_FIELD;
3932         }
3933
3934         buf = transport_kmap_data_sg(cmd);
3935         if (!buf)
3936                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3937
3938         buf[0] = ((add_len << 8) & 0xff);
3939         buf[1] = (add_len & 0xff);
3940         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3941         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3942         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3943         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3944         /*
3945          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3946          * set the TMV: Task Mask Valid bit.
3947          */
3948         buf[3] |= 0x80;
3949         /*
3950          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3951          */
3952         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3953         /*
3954          * PTPL_A: Persistence across Target Power Loss Active bit
3955          */
3956         if (pr_tmpl->pr_aptpl_active)
3957                 buf[3] |= 0x01;
3958         /*
3959          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3960          */
3961         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3962         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3963         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3964         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3965         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3966         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3967
3968         transport_kunmap_data_sg(cmd);
3969
3970         return 0;
3971 }
3972
3973 /*
3974  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3975  *
3976  * See spc4r17 section 6.13.5 Table 168 and 169
3977  */
3978 static sense_reason_t
3979 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3980 {
3981         struct se_device *dev = cmd->se_dev;
3982         struct se_node_acl *se_nacl;
3983         struct se_portal_group *se_tpg;
3984         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3985         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3986         unsigned char *buf;
3987         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3988         u32 off = 8; /* off into first Full Status descriptor */
3989         int format_code = 0;
3990
3991         if (cmd->data_length < 8) {
3992                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3993                         " too small\n", cmd->data_length);
3994                 return TCM_INVALID_CDB_FIELD;
3995         }
3996
3997         buf = transport_kmap_data_sg(cmd);
3998         if (!buf)
3999                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4000
4001         buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
4002         buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
4003         buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
4004         buf[3] = (dev->t10_pr.pr_generation & 0xff);
4005
4006         spin_lock(&pr_tmpl->registration_lock);
4007         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4008                         &pr_tmpl->registration_list, pr_reg_list) {
4009
4010                 se_nacl = pr_reg->pr_reg_nacl;
4011                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4012                 add_desc_len = 0;
4013
4014                 atomic_inc(&pr_reg->pr_res_holders);
4015                 smp_mb__after_atomic_inc();
4016                 spin_unlock(&pr_tmpl->registration_lock);
4017                 /*
4018                  * Determine expected length of $FABRIC_MOD specific
4019                  * TransportID full status descriptor..
4020                  */
4021                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4022                                 se_tpg, se_nacl, pr_reg, &format_code);
4023
4024                 if ((exp_desc_len + add_len) > cmd->data_length) {
4025                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4026                                 " out of buffer: %d\n", cmd->data_length);
4027                         spin_lock(&pr_tmpl->registration_lock);
4028                         atomic_dec(&pr_reg->pr_res_holders);
4029                         smp_mb__after_atomic_dec();
4030                         break;
4031                 }
4032                 /*
4033                  * Set RESERVATION KEY
4034                  */
4035                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4036                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4037                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4038                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4039                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4040                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4041                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4042                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4043                 off += 4; /* Skip Over Reserved area */
4044
4045                 /*
4046                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4047                  */
4048                 if (pr_reg->pr_reg_all_tg_pt)
4049                         buf[off] = 0x02;
4050                 /*
4051                  * The struct se_lun pointer will be present for the
4052                  * reservation holder for PR_HOLDER bit.
4053                  *
4054                  * Also, if this registration is the reservation
4055                  * holder, fill in SCOPE and TYPE in the next byte.
4056                  */
4057                 if (pr_reg->pr_res_holder) {
4058                         buf[off++] |= 0x01;
4059                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4060                                      (pr_reg->pr_res_type & 0x0f);
4061                 } else
4062                         off += 2;
4063
4064                 off += 4; /* Skip over reserved area */
4065                 /*
4066                  * From spc4r17 6.3.15:
4067                  *
4068                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4069                  * IDENTIFIER field contains the relative port identifier (see
4070                  * 3.1.120) of the target port that is part of the I_T nexus
4071                  * described by this full status descriptor. If the ALL_TG_PT
4072                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4073                  * IDENTIFIER field are not defined by this standard.
4074                  */
4075                 if (!pr_reg->pr_reg_all_tg_pt) {
4076                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4077
4078                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4079                         buf[off++] = (port->sep_rtpi & 0xff);
4080                 } else
4081                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4082
4083                 /*
4084                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4085                  */
4086                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4087                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4088
4089                 spin_lock(&pr_tmpl->registration_lock);
4090                 atomic_dec(&pr_reg->pr_res_holders);
4091                 smp_mb__after_atomic_dec();
4092                 /*
4093                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4094                  */
4095                 buf[off++] = ((desc_len >> 24) & 0xff);
4096                 buf[off++] = ((desc_len >> 16) & 0xff);
4097                 buf[off++] = ((desc_len >> 8) & 0xff);
4098                 buf[off++] = (desc_len & 0xff);
4099                 /*
4100                  * Size of full desctipor header minus TransportID
4101                  * containing $FABRIC_MOD specific) initiator device/port
4102                  * WWN information.
4103                  *
4104                  *  See spc4r17 Section 6.13.5 Table 169
4105                  */
4106                 add_desc_len = (24 + desc_len);
4107
4108                 off += desc_len;
4109                 add_len += add_desc_len;
4110         }
4111         spin_unlock(&pr_tmpl->registration_lock);
4112         /*
4113          * Set ADDITIONAL_LENGTH
4114          */
4115         buf[4] = ((add_len >> 24) & 0xff);
4116         buf[5] = ((add_len >> 16) & 0xff);
4117         buf[6] = ((add_len >> 8) & 0xff);
4118         buf[7] = (add_len & 0xff);
4119
4120         transport_kunmap_data_sg(cmd);
4121
4122         return 0;
4123 }
4124
4125 sense_reason_t
4126 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4127 {
4128         sense_reason_t ret;
4129
4130         /*
4131          * Following spc2r20 5.5.1 Reservations overview:
4132          *
4133          * If a logical unit has been reserved by any RESERVE command and is
4134          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4135          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4136          * initiator or service action and shall terminate with a RESERVATION
4137          * CONFLICT status.
4138          */
4139         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4140                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4141                         " SPC-2 reservation is held, returning"
4142                         " RESERVATION_CONFLICT\n");
4143                 return TCM_RESERVATION_CONFLICT;
4144         }
4145
4146         switch (cmd->t_task_cdb[1] & 0x1f) {
4147         case PRI_READ_KEYS:
4148                 ret = core_scsi3_pri_read_keys(cmd);
4149                 break;
4150         case PRI_READ_RESERVATION:
4151                 ret = core_scsi3_pri_read_reservation(cmd);
4152                 break;
4153         case PRI_REPORT_CAPABILITIES:
4154                 ret = core_scsi3_pri_report_capabilities(cmd);
4155                 break;
4156         case PRI_READ_FULL_STATUS:
4157                 ret = core_scsi3_pri_read_full_status(cmd);
4158                 break;
4159         default:
4160                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4161                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4162                 return TCM_INVALID_CDB_FIELD;
4163         }
4164
4165         if (!ret)
4166                 target_complete_cmd(cmd, GOOD);
4167         return ret;
4168 }
4169
4170 sense_reason_t
4171 target_check_reservation(struct se_cmd *cmd)
4172 {
4173         struct se_device *dev = cmd->se_dev;
4174         sense_reason_t ret;
4175
4176         if (!cmd->se_sess)
4177                 return 0;
4178         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4179                 return 0;
4180         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4181                 return 0;
4182
4183         spin_lock(&dev->dev_reservation_lock);
4184         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4185                 ret = target_scsi2_reservation_check(cmd);
4186         else
4187                 ret = target_scsi3_pr_reservation_check(cmd);
4188         spin_unlock(&dev->dev_reservation_lock);
4189
4190         return ret;
4191 }