drivers/target/target_core_pr.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_pr.c
   4  *
   5  * This file contains SPC-3 compliant persistent reservations and
   6  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   7  *
   8  * (c) Copyright 2009-2013 Datera, Inc.
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  ******************************************************************************/
  13
  14 #include <linux/slab.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/list.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/file.h>
  19 #include <linux/fcntl.h>
  20 #include <linux/fs.h>
  21 #include <scsi/scsi_proto.h>
  22 #include <asm/unaligned.h>
  23
  24 #include <target/target_core_base.h>
  25 #include <target/target_core_backend.h>
  26 #include <target/target_core_fabric.h>
  27
  28 #include "target_core_internal.h"
  29 #include "target_core_pr.h"
  30 #include "target_core_ua.h"
  31
  32 /*
  33  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  34  */
  35 struct pr_transport_id_holder {
  36         struct t10_pr_registration *dest_pr_reg;
  37         struct se_portal_group *dest_tpg;
  38         struct se_node_acl *dest_node_acl;
  39         struct se_dev_entry *dest_se_deve;
  40         struct list_head dest_list;
  41 };
  42
  43 void core_pr_dump_initiator_port(
  44         struct t10_pr_registration *pr_reg,
  45         char *buf,
  46         u32 size)
  47 {
  48         if (!pr_reg->isid_present_at_reg) {
  49                 buf[0] = '\0';
  50                 return;
  51         }
  52
  53         snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
  54 }
  55
  56 enum register_type {
  57         REGISTER,
  58         REGISTER_AND_IGNORE_EXISTING_KEY,
  59         REGISTER_AND_MOVE,
  60 };
  61
  62 enum preempt_type {
  63         PREEMPT,
  64         PREEMPT_AND_ABORT,
  65 };
  66
  67 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  68                                               struct t10_pr_registration *, int, int);
  69
  70 static int is_reservation_holder(
  71         struct t10_pr_registration *pr_res_holder,
  72         struct t10_pr_registration *pr_reg)
  73 {
  74         int pr_res_type;
  75
  76         if (pr_res_holder) {
  77                 pr_res_type = pr_res_holder->pr_res_type;
  78
  79                 return pr_res_holder == pr_reg ||
  80                        pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
  81                        pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
  82         }
  83         return 0;
  84 }
  85
  86 static sense_reason_t
  87 target_scsi2_reservation_check(struct se_cmd *cmd)
  88 {
  89         struct se_device *dev = cmd->se_dev;
  90         struct se_session *sess = cmd->se_sess;
  91
  92         switch (cmd->t_task_cdb[0]) {
  93         case INQUIRY:
  94         case RELEASE:
  95         case RELEASE_10:
  96                 return 0;
  97         default:
  98                 break;
  99         }
 100
 101         if (!dev->reservation_holder || !sess)
 102                 return 0;
 103
 104         if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
 105                 return TCM_RESERVATION_CONFLICT;
 106
 107         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 108                 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 109                         return TCM_RESERVATION_CONFLICT;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 116                                         struct se_node_acl *, struct se_session *);
 117 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 118
 119 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
 120 {
 121         struct se_session *se_sess = cmd->se_sess;
 122         struct se_device *dev = cmd->se_dev;
 123         struct t10_pr_registration *pr_reg;
 124         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 125         int conflict = 0;
 126
 127         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 128                         se_sess);
 129         if (pr_reg) {
 130                 /*
 131                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 132                  * behavior
 133                  *
 134                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 135                  * status, but no reservation shall be established and the
 136                  * persistent reservation shall not be changed, if the command
 137                  * is received from a) and b) below.
 138                  *
 139                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 140                  * status, but the persistent reservation shall not be released,
 141                  * if the command is received from a) and b)
 142                  *
 143                  * a) An I_T nexus that is a persistent reservation holder; or
 144                  * b) An I_T nexus that is registered if a registrants only or
 145                  *    all registrants type persistent reservation is present.
 146                  *
 147                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 148                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 149                  * as defined in SPC-2.
 150                  */
 151                 if (pr_reg->pr_res_holder) {
 152                         core_scsi3_put_pr_reg(pr_reg);
 153                         return 1;
 154                 }
 155                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 156                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 157                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 158                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 159                         core_scsi3_put_pr_reg(pr_reg);
 160                         return 1;
 161                 }
 162                 core_scsi3_put_pr_reg(pr_reg);
 163                 conflict = 1;
 164         } else {
 165                 /*
 166                  * Following spc2r20 5.5.1 Reservations overview:
 167                  *
 168                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 169                  * command with the REGISTER or the REGISTER AND IGNORE
 170                  * EXISTING KEY service action and is still registered by any
 171                  * initiator, all RESERVE commands and all RELEASE commands
 172                  * regardless of initiator shall conflict and shall terminate
 173                  * with a RESERVATION CONFLICT status.
 174                  */
 175                 spin_lock(&pr_tmpl->registration_lock);
 176                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 177                 spin_unlock(&pr_tmpl->registration_lock);
 178         }
 179
 180         if (conflict) {
 181                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 182                         " while active SPC-3 registrations exist,"
 183                         " returning RESERVATION_CONFLICT\n");
 184                 return -EBUSY;
 185         }
 186
 187         return 0;
 188 }
 189
 190 void target_release_reservation(struct se_device *dev)
 191 {
 192         dev->reservation_holder = NULL;
 193         dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 194         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
 195                 dev->dev_res_bin_isid = 0;
 196                 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
 197         }
 198 }
 199
 200 sense_reason_t
 201 target_scsi2_reservation_release(struct se_cmd *cmd)
 202 {
 203         struct se_device *dev = cmd->se_dev;
 204         struct se_session *sess = cmd->se_sess;
 205         struct se_portal_group *tpg;
 206         int rc;
 207
 208         if (!sess || !sess->se_tpg)
 209                 goto out;
 210         rc = target_check_scsi2_reservation_conflict(cmd);
 211         if (rc == 1)
 212                 goto out;
 213         if (rc < 0)
 214                 return TCM_RESERVATION_CONFLICT;
 215
 216         spin_lock(&dev->dev_reservation_lock);
 217         if (!dev->reservation_holder || !sess)
 218                 goto out_unlock;
 219
 220         if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
 221                 goto out_unlock;
 222
 223         if (dev->dev_res_bin_isid != sess->sess_bin_isid)
 224                 goto out_unlock;
 225
 226         target_release_reservation(dev);
 227         tpg = sess->se_tpg;
 228         pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
 229                 " MAPPED LUN: %llu for %s\n",
 230                 tpg->se_tpg_tfo->fabric_name,
 231                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 232                 sess->se_node_acl->initiatorname);
 233
 234 out_unlock:
 235         spin_unlock(&dev->dev_reservation_lock);
 236 out:
 237         target_complete_cmd(cmd, SAM_STAT_GOOD);
 238         return 0;
 239 }
 240
 241 sense_reason_t
 242 target_scsi2_reservation_reserve(struct se_cmd *cmd)
 243 {
 244         struct se_device *dev = cmd->se_dev;
 245         struct se_session *sess = cmd->se_sess;
 246         struct se_portal_group *tpg;
 247         sense_reason_t ret = 0;
 248         int rc;
 249
 250         if ((cmd->t_task_cdb[1] & 0x01) &&
 251             (cmd->t_task_cdb[1] & 0x02)) {
 252                 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
 253                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 254         }
 255         /*
 256          * This is currently the case for target_core_mod passthrough struct se_cmd
 257          * ops
 258          */
 259         if (!sess || !sess->se_tpg)
 260                 goto out;
 261         rc = target_check_scsi2_reservation_conflict(cmd);
 262         if (rc == 1)
 263                 goto out;
 264
 265         if (rc < 0)
 266                 return TCM_RESERVATION_CONFLICT;
 267
 268         tpg = sess->se_tpg;
 269         spin_lock(&dev->dev_reservation_lock);
 270         if (dev->reservation_holder &&
 271             dev->reservation_holder->se_node_acl != sess->se_node_acl) {
 272                 pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n",
 273                         tpg->se_tpg_tfo->fabric_name);
 274                 pr_err("Original reserver LUN: %llu %s\n",
 275                         cmd->se_lun->unpacked_lun,
 276                         dev->reservation_holder->se_node_acl->initiatorname);
 277                 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
 278                         " from %s \n", cmd->se_lun->unpacked_lun,
 279                         cmd->orig_fe_lun,
 280                         sess->se_node_acl->initiatorname);
 281                 ret = TCM_RESERVATION_CONFLICT;
 282                 goto out_unlock;
 283         }
 284
 285         dev->reservation_holder = sess;
 286         dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
 287         if (sess->sess_bin_isid != 0) {
 288                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 289                 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
 290         }
 291         pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
 292                 " for %s\n", tpg->se_tpg_tfo->fabric_name,
 293                 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
 294                 sess->se_node_acl->initiatorname);
 295
 296 out_unlock:
 297         spin_unlock(&dev->dev_reservation_lock);
 298 out:
 299         if (!ret)
 300                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 301         return ret;
 302 }
 303
 304
 305 /*
 306  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 307  *
 308  * This function is called by those initiator ports who are *NOT*
 309  * the active PR reservation holder when a reservation is present.
 310  */
 311 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
 312                                         bool isid_mismatch)
 313 {
 314         unsigned char *cdb = cmd->t_task_cdb;
 315         struct se_session *se_sess = cmd->se_sess;
 316         struct se_node_acl *nacl = se_sess->se_node_acl;
 317         int other_cdb = 0;
 318         int registered_nexus = 0, ret = 1; /* Conflict by default */
 319         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 320         int we = 0; /* Write Exclusive */
 321         int legacy = 0; /* Act like a legacy device and return
 322                          * RESERVATION CONFLICT on some CDBs */
 323
 324         if (isid_mismatch) {
 325                 registered_nexus = 0;
 326         } else {
 327                 struct se_dev_entry *se_deve;
 328
 329                 rcu_read_lock();
 330                 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
 331                 if (se_deve)
 332                         registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
 333                                                     &se_deve->deve_flags);
 334                 rcu_read_unlock();
 335         }
 336
 337         switch (pr_reg_type) {
 338         case PR_TYPE_WRITE_EXCLUSIVE:
 339                 we = 1;
 340                 fallthrough;
 341         case PR_TYPE_EXCLUSIVE_ACCESS:
 342                 /*
 343                  * Some commands are only allowed for the persistent reservation
 344                  * holder.
 345                  */
 346                 break;
 347         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 348                 we = 1;
 349                 fallthrough;
 350         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 351                 /*
 352                  * Some commands are only allowed for registered I_T Nexuses.
 353                  */
 354                 reg_only = 1;
 355                 break;
 356         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 357                 we = 1;
 358                 fallthrough;
 359         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 360                 /*
 361                  * Each registered I_T Nexus is a reservation holder.
 362                  */
 363                 all_reg = 1;
 364                 break;
 365         default:
 366                 return -EINVAL;
 367         }
 368         /*
 369          * Referenced from spc4r17 table 45 for *NON* PR holder access
 370          */
 371         switch (cdb[0]) {
 372         case SECURITY_PROTOCOL_IN:
 373                 if (registered_nexus)
 374                         return 0;
 375                 ret = (we) ? 0 : 1;
 376                 break;
 377         case MODE_SENSE:
 378         case MODE_SENSE_10:
 379         case READ_ATTRIBUTE:
 380         case READ_BUFFER:
 381         case RECEIVE_DIAGNOSTIC:
 382                 if (legacy) {
 383                         ret = 1;
 384                         break;
 385                 }
 386                 if (registered_nexus) {
 387                         ret = 0;
 388                         break;
 389                 }
 390                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 391                 break;
 392         case PERSISTENT_RESERVE_OUT:
 393                 /*
 394                  * This follows PERSISTENT_RESERVE_OUT service actions that
 395                  * are allowed in the presence of various reservations.
 396                  * See spc4r17, table 46
 397                  */
 398                 switch (cdb[1] & 0x1f) {
 399                 case PRO_CLEAR:
 400                 case PRO_PREEMPT:
 401                 case PRO_PREEMPT_AND_ABORT:
 402                         ret = (registered_nexus) ? 0 : 1;
 403                         break;
 404                 case PRO_REGISTER:
 405                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 406                         ret = 0;
 407                         break;
 408                 case PRO_REGISTER_AND_MOVE:
 409                 case PRO_RESERVE:
 410                         ret = 1;
 411                         break;
 412                 case PRO_RELEASE:
 413                         ret = (registered_nexus) ? 0 : 1;
 414                         break;
 415                 default:
 416                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 417                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 418                         return -EINVAL;
 419                 }
 420                 break;
 421         case RELEASE:
 422         case RELEASE_10:
 423                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 424                 ret = 0;
 425                 break;
 426         case RESERVE:
 427         case RESERVE_10:
 428                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 429                 ret = 0;
 430                 break;
 431         case TEST_UNIT_READY:
 432                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 433                 break;
 434         case MAINTENANCE_IN:
 435                 switch (cdb[1] & 0x1f) {
 436                 case MI_MANAGEMENT_PROTOCOL_IN:
 437                         if (registered_nexus) {
 438                                 ret = 0;
 439                                 break;
 440                         }
 441                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 442                         break;
 443                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 444                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 445                         if (legacy) {
 446                                 ret = 1;
 447                                 break;
 448                         }
 449                         if (registered_nexus) {
 450                                 ret = 0;
 451                                 break;
 452                         }
 453                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 454                         break;
 455                 case MI_REPORT_ALIASES:
 456                 case MI_REPORT_IDENTIFYING_INFORMATION:
 457                 case MI_REPORT_PRIORITY:
 458                 case MI_REPORT_TARGET_PGS:
 459                 case MI_REPORT_TIMESTAMP:
 460                         ret = 0; /* Allowed */
 461                         break;
 462                 default:
 463                         pr_err("Unknown MI Service Action: 0x%02x\n",
 464                                 (cdb[1] & 0x1f));
 465                         return -EINVAL;
 466                 }
 467                 break;
 468         case ACCESS_CONTROL_IN:
 469         case ACCESS_CONTROL_OUT:
 470         case INQUIRY:
 471         case LOG_SENSE:
 472         case SERVICE_ACTION_IN_12:
 473         case READ_CAPACITY:
 474         case REPORT_LUNS:
 475         case REQUEST_SENSE:
 476         case PERSISTENT_RESERVE_IN:
 477                 ret = 0; /*/ Allowed CDBs */
 478                 break;
 479         default:
 480                 other_cdb = 1;
 481                 break;
 482         }
 483         /*
 484          * Case where the CDB is explicitly allowed in the above switch
 485          * statement.
 486          */
 487         if (!ret && !other_cdb) {
 488                 pr_debug("Allowing explicit CDB: 0x%02x for %s"
 489                         " reservation holder\n", cdb[0],
 490                         core_scsi3_pr_dump_type(pr_reg_type));
 491
 492                 return ret;
 493         }
 494         /*
 495          * Check if write exclusive initiator ports *NOT* holding the
 496          * WRITE_EXCLUSIVE_* reservation.
 497          */
 498         if (we && !registered_nexus) {
 499                 if (cmd->data_direction == DMA_TO_DEVICE) {
 500                         /*
 501                          * Conflict for write exclusive
 502                          */
 503                         pr_debug("%s Conflict for unregistered nexus"
 504                                 " %s CDB: 0x%02x to %s reservation\n",
 505                                 transport_dump_cmd_direction(cmd),
 506                                 se_sess->se_node_acl->initiatorname, cdb[0],
 507                                 core_scsi3_pr_dump_type(pr_reg_type));
 508                         return 1;
 509                 } else {
 510                         /*
 511                          * Allow non WRITE CDBs for all Write Exclusive
 512                          * PR TYPEs to pass for registered and
 513                          * non-registered_nexuxes NOT holding the reservation.
 514                          *
 515                          * We only make noise for the unregisterd nexuses,
 516                          * as we expect registered non-reservation holding
 517                          * nexuses to issue CDBs.
 518                          */
 519
 520                         if (!registered_nexus) {
 521                                 pr_debug("Allowing implicit CDB: 0x%02x"
 522                                         " for %s reservation on unregistered"
 523                                         " nexus\n", cdb[0],
 524                                         core_scsi3_pr_dump_type(pr_reg_type));
 525                         }
 526
 527                         return 0;
 528                 }
 529         } else if ((reg_only) || (all_reg)) {
 530                 if (registered_nexus) {
 531                         /*
 532                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 533                          * allow commands from registered nexuses.
 534                          */
 535
 536                         pr_debug("Allowing implicit CDB: 0x%02x for %s"
 537                                 " reservation\n", cdb[0],
 538                                 core_scsi3_pr_dump_type(pr_reg_type));
 539
 540                         return 0;
 541                 }
 542        } else if (we && registered_nexus) {
 543                /*
 544                 * Reads are allowed for Write Exclusive locks
 545                 * from all registrants.
 546                 */
 547                if (cmd->data_direction == DMA_FROM_DEVICE) {
 548                        pr_debug("Allowing READ CDB: 0x%02x for %s"
 549                                " reservation\n", cdb[0],
 550                                core_scsi3_pr_dump_type(pr_reg_type));
 551
 552                        return 0;
 553                }
 554         }
 555         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 556                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 557                 (registered_nexus) ? "" : "un",
 558                 se_sess->se_node_acl->initiatorname, cdb[0],
 559                 core_scsi3_pr_dump_type(pr_reg_type));
 560
 561         return 1; /* Conflict by default */
 562 }
 563
 564 static sense_reason_t
 565 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
 566 {
 567         struct se_device *dev = cmd->se_dev;
 568         struct se_session *sess = cmd->se_sess;
 569         u32 pr_reg_type;
 570         bool isid_mismatch = false;
 571
 572         if (!dev->dev_pr_res_holder)
 573                 return 0;
 574
 575         pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 576         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 577         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
 578                 goto check_nonholder;
 579
 580         if (dev->dev_pr_res_holder->isid_present_at_reg) {
 581                 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
 582                     sess->sess_bin_isid) {
 583                         isid_mismatch = true;
 584                         goto check_nonholder;
 585                 }
 586         }
 587
 588         return 0;
 589
 590 check_nonholder:
 591         if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
 592                 return TCM_RESERVATION_CONFLICT;
 593         return 0;
 594 }
 595
 596 static u32 core_scsi3_pr_generation(struct se_device *dev)
 597 {
 598         u32 prg;
 599
 600         /*
 601          * PRGeneration field shall contain the value of a 32-bit wrapping
 602          * counter mainted by the device server.
 603          *
 604          * Note that this is done regardless of Active Persist across
 605          * Target PowerLoss (APTPL)
 606          *
 607          * See spc4r17 section 6.3.12 READ_KEYS service action
 608          */
 609         spin_lock(&dev->dev_reservation_lock);
 610         prg = dev->t10_pr.pr_generation++;
 611         spin_unlock(&dev->dev_reservation_lock);
 612
 613         return prg;
 614 }
 615
 616 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 617         struct se_device *dev,
 618         struct se_node_acl *nacl,
 619         struct se_lun *lun,
 620         struct se_dev_entry *dest_deve,
 621         u64 mapped_lun,
 622         unsigned char *isid,
 623         u64 sa_res_key,
 624         int all_tg_pt,
 625         int aptpl)
 626 {
 627         struct t10_pr_registration *pr_reg;
 628
 629         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 630         if (!pr_reg) {
 631                 pr_err("Unable to allocate struct t10_pr_registration\n");
 632                 return NULL;
 633         }
 634
 635         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 636         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 637         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 638         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 639         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 640         atomic_set(&pr_reg->pr_res_holders, 0);
 641         pr_reg->pr_reg_nacl = nacl;
 642         /*
 643          * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
 644          * the se_dev_entry->pr_ref will have been already obtained by
 645          * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
 646          *
 647          * Otherwise, locate se_dev_entry now and obtain a reference until
 648          * registration completes in __core_scsi3_add_registration().
 649          */
 650         if (dest_deve) {
 651                 pr_reg->pr_reg_deve = dest_deve;
 652         } else {
 653                 rcu_read_lock();
 654                 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 655                 if (!pr_reg->pr_reg_deve) {
 656                         rcu_read_unlock();
 657                         pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
 658                                 nacl->initiatorname, mapped_lun);
 659                         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 660                         return NULL;
 661                 }
 662                 kref_get(&pr_reg->pr_reg_deve->pr_kref);
 663                 rcu_read_unlock();
 664         }
 665         pr_reg->pr_res_mapped_lun = mapped_lun;
 666         pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
 667         pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
 668         pr_reg->pr_res_key = sa_res_key;
 669         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 670         pr_reg->pr_reg_aptpl = aptpl;
 671         /*
 672          * If an ISID value for this SCSI Initiator Port exists,
 673          * save it to the registration now.
 674          */
 675         if (isid != NULL) {
 676                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 677                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 678                 pr_reg->isid_present_at_reg = 1;
 679         }
 680
 681         return pr_reg;
 682 }
 683
 684 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 685 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 686
 687 /*
 688  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 689  * modes.
 690  */
 691 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 692         struct se_device *dev,
 693         struct se_node_acl *nacl,
 694         struct se_lun *lun,
 695         struct se_dev_entry *deve,
 696         u64 mapped_lun,
 697         unsigned char *isid,
 698         u64 sa_res_key,
 699         int all_tg_pt,
 700         int aptpl)
 701 {
 702         struct se_dev_entry *deve_tmp;
 703         struct se_node_acl *nacl_tmp;
 704         struct se_lun_acl *lacl_tmp;
 705         struct se_lun *lun_tmp, *next, *dest_lun;
 706         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 707         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 708         int ret;
 709         /*
 710          * Create a registration for the I_T Nexus upon which the
 711          * PROUT REGISTER was received.
 712          */
 713         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
 714                                                     isid, sa_res_key, all_tg_pt,
 715                                                     aptpl);
 716         if (!pr_reg)
 717                 return NULL;
 718         /*
 719          * Return pointer to pr_reg for ALL_TG_PT=0
 720          */
 721         if (!all_tg_pt)
 722                 return pr_reg;
 723         /*
 724          * Create list of matching SCSI Initiator Port registrations
 725          * for ALL_TG_PT=1
 726          */
 727         spin_lock(&dev->se_port_lock);
 728         list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
 729                 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
 730                         continue;
 731                 spin_unlock(&dev->se_port_lock);
 732
 733                 spin_lock(&lun_tmp->lun_deve_lock);
 734                 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 735                         /*
 736                          * This pointer will be NULL for demo mode MappedLUNs
 737                          * that have not been make explicit via a ConfigFS
 738                          * MappedLUN group for the SCSI Initiator Node ACL.
 739                          */
 740                         if (!deve_tmp->se_lun_acl)
 741                                 continue;
 742
 743                         lacl_tmp = deve_tmp->se_lun_acl;
 744                         nacl_tmp = lacl_tmp->se_lun_nacl;
 745                         /*
 746                          * Skip the matching struct se_node_acl that is allocated
 747                          * above..
 748                          */
 749                         if (nacl == nacl_tmp)
 750                                 continue;
 751                         /*
 752                          * Only perform PR registrations for target ports on
 753                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 754                          * arrived.
 755                          */
 756                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 757                                 continue;
 758                         /*
 759                          * Look for a matching Initiator Node ACL in ASCII format
 760                          */
 761                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 762                                 continue;
 763
 764                         kref_get(&deve_tmp->pr_kref);
 765                         spin_unlock(&lun_tmp->lun_deve_lock);
 766                         /*
 767                          * Grab a configfs group dependency that is released
 768                          * for the exception path at label out: below, or upon
 769                          * completion of adding ALL_TG_PT=1 registrations in
 770                          * __core_scsi3_add_registration()
 771                          */
 772                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 773                         if (ret < 0) {
 774                                 pr_err("core_scsi3_lunacl_depend"
 775                                                 "_item() failed\n");
 776                                 percpu_ref_put(&lun_tmp->lun_ref);
 777                                 kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
 778                                 goto out;
 779                         }
 780                         /*
 781                          * Located a matching SCSI Initiator Port on a different
 782                          * port, allocate the pr_reg_atp and attach it to the
 783                          * pr_reg->pr_reg_atp_list that will be processed once
 784                          * the original *pr_reg is processed in
 785                          * __core_scsi3_add_registration()
 786                          */
 787                         dest_lun = deve_tmp->se_lun;
 788
 789                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 790                                                 nacl_tmp, dest_lun, deve_tmp,
 791                                                 deve_tmp->mapped_lun, NULL,
 792                                                 sa_res_key, all_tg_pt, aptpl);
 793                         if (!pr_reg_atp) {
 794                                 percpu_ref_put(&lun_tmp->lun_ref);
 795                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 796                                 goto out;
 797                         }
 798
 799                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 800                                       &pr_reg->pr_reg_atp_list);
 801                         spin_lock(&lun_tmp->lun_deve_lock);
 802                 }
 803                 spin_unlock(&lun_tmp->lun_deve_lock);
 804
 805                 spin_lock(&dev->se_port_lock);
 806                 percpu_ref_put(&lun_tmp->lun_ref);
 807         }
 808         spin_unlock(&dev->se_port_lock);
 809
 810         return pr_reg;
 811 out:
 812         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 813                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 814                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 815                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 816                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 817         }
 818         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 819         return NULL;
 820 }
 821
 822 int core_scsi3_alloc_aptpl_registration(
 823         struct t10_reservation *pr_tmpl,
 824         u64 sa_res_key,
 825         unsigned char *i_port,
 826         unsigned char *isid,
 827         u64 mapped_lun,
 828         unsigned char *t_port,
 829         u16 tpgt,
 830         u64 target_lun,
 831         int res_holder,
 832         int all_tg_pt,
 833         u8 type)
 834 {
 835         struct t10_pr_registration *pr_reg;
 836
 837         if (!i_port || !t_port || !sa_res_key) {
 838                 pr_err("Illegal parameters for APTPL registration\n");
 839                 return -EINVAL;
 840         }
 841
 842         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 843         if (!pr_reg) {
 844                 pr_err("Unable to allocate struct t10_pr_registration\n");
 845                 return -ENOMEM;
 846         }
 847
 848         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 849         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 850         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 851         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 852         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 853         atomic_set(&pr_reg->pr_res_holders, 0);
 854         pr_reg->pr_reg_nacl = NULL;
 855         pr_reg->pr_reg_deve = NULL;
 856         pr_reg->pr_res_mapped_lun = mapped_lun;
 857         pr_reg->pr_aptpl_target_lun = target_lun;
 858         pr_reg->pr_res_key = sa_res_key;
 859         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 860         pr_reg->pr_reg_aptpl = 1;
 861         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 862         pr_reg->pr_res_type = type;
 863         /*
 864          * If an ISID value had been saved in APTPL metadata for this
 865          * SCSI Initiator Port, restore it now.
 866          */
 867         if (isid != NULL) {
 868                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 869                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 870                 pr_reg->isid_present_at_reg = 1;
 871         }
 872         /*
 873          * Copy the i_port and t_port information from caller.
 874          */
 875         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 876         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 877         pr_reg->pr_reg_tpgt = tpgt;
 878         /*
 879          * Set pr_res_holder from caller, the pr_reg who is the reservation
 880          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 881          * the Initiator Node LUN ACL from the fabric module is created for
 882          * this registration.
 883          */
 884         pr_reg->pr_res_holder = res_holder;
 885
 886         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 887         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 888                         " metadata\n", (res_holder) ? "+reservation" : "");
 889         return 0;
 890 }
 891
 892 static void core_scsi3_aptpl_reserve(
 893         struct se_device *dev,
 894         struct se_portal_group *tpg,
 895         struct se_node_acl *node_acl,
 896         struct t10_pr_registration *pr_reg)
 897 {
 898         char i_buf[PR_REG_ISID_ID_LEN] = { };
 899
 900         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
 901
 902         spin_lock(&dev->dev_reservation_lock);
 903         dev->dev_pr_res_holder = pr_reg;
 904         spin_unlock(&dev->dev_reservation_lock);
 905
 906         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 907                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 908                 tpg->se_tpg_tfo->fabric_name,
 909                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 910                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 911         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 912                 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname,
 913                 i_buf);
 914 }
 915
 916 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 917                                 struct t10_pr_registration *, enum register_type, int);
 918
 919 static int __core_scsi3_check_aptpl_registration(
 920         struct se_device *dev,
 921         struct se_portal_group *tpg,
 922         struct se_lun *lun,
 923         u64 target_lun,
 924         struct se_node_acl *nacl,
 925         u64 mapped_lun)
 926 {
 927         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 928         struct t10_reservation *pr_tmpl = &dev->t10_pr;
 929         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };
 930         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };
 931         u16 tpgt;
 932
 933         /*
 934          * Copy Initiator Port information from struct se_node_acl
 935          */
 936         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 937         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 938                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 939         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 940         /*
 941          * Look for the matching registrations+reservation from those
 942          * created from APTPL metadata.  Note that multiple registrations
 943          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 944          * TransportIDs.
 945          */
 946         spin_lock(&pr_tmpl->aptpl_reg_lock);
 947         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 948                                 pr_reg_aptpl_list) {
 949
 950                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 951                      (pr_reg->pr_res_mapped_lun == mapped_lun) &&
 952                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 953                      (pr_reg->pr_reg_tpgt == tpgt) &&
 954                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 955                         /*
 956                          * Obtain the ->pr_reg_deve pointer + reference, that
 957                          * is released by __core_scsi3_add_registration() below.
 958                          */
 959                         rcu_read_lock();
 960                         pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
 961                         if (!pr_reg->pr_reg_deve) {
 962                                 pr_err("Unable to locate PR APTPL %s mapped_lun:"
 963                                         " %llu\n", nacl->initiatorname, mapped_lun);
 964                                 rcu_read_unlock();
 965                                 continue;
 966                         }
 967                         kref_get(&pr_reg->pr_reg_deve->pr_kref);
 968                         rcu_read_unlock();
 969
 970                         pr_reg->pr_reg_nacl = nacl;
 971                         pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
 972                         list_del(&pr_reg->pr_reg_aptpl_list);
 973                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 974                         /*
 975                          * At this point all of the pointers in *pr_reg will
 976                          * be setup, so go ahead and add the registration.
 977                          */
 978                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 979                         /*
 980                          * If this registration is the reservation holder,
 981                          * make that happen now..
 982                          */
 983                         if (pr_reg->pr_res_holder)
 984                                 core_scsi3_aptpl_reserve(dev, tpg,
 985                                                 nacl, pr_reg);
 986                         /*
 987                          * Reenable pr_aptpl_active to accept new metadata
 988                          * updates once the SCSI device is active again..
 989                          */
 990                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 991                         pr_tmpl->pr_aptpl_active = 1;
 992                 }
 993         }
 994         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 995
 996         return 0;
 997 }
 998
 999 int core_scsi3_check_aptpl_registration(
1000         struct se_device *dev,
1001         struct se_portal_group *tpg,
1002         struct se_lun *lun,
1003         struct se_node_acl *nacl,
1004         u64 mapped_lun)
1005 {
1006         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1007                 return 0;
1008
1009         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
1010                                                      lun->unpacked_lun, nacl,
1011                                                      mapped_lun);
1012 }
1013
1014 static void __core_scsi3_dump_registration(
1015         const struct target_core_fabric_ops *tfo,
1016         struct se_device *dev,
1017         struct se_node_acl *nacl,
1018         struct t10_pr_registration *pr_reg,
1019         enum register_type register_type)
1020 {
1021         struct se_portal_group *se_tpg = nacl->se_tpg;
1022         char i_buf[PR_REG_ISID_ID_LEN] = { };
1023
1024         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1025
1026         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1027                 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?
1028                 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
1029                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1030                 i_buf);
1031         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1032                  tfo->fabric_name, tfo->tpg_get_wwn(se_tpg),
1033                 tfo->tpg_get_tag(se_tpg));
1034         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1035                 " Port(s)\n",  tfo->fabric_name,
1036                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1037                 dev->transport->name);
1038         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1039                 " 0x%08x  APTPL: %d\n", tfo->fabric_name,
1040                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1041                 pr_reg->pr_reg_aptpl);
1042 }
1043
1044 static void __core_scsi3_add_registration(
1045         struct se_device *dev,
1046         struct se_node_acl *nacl,
1047         struct t10_pr_registration *pr_reg,
1048         enum register_type register_type,
1049         int register_move)
1050 {
1051         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1052         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1053         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1054         struct se_dev_entry *deve;
1055
1056         /*
1057          * Increment PRgeneration counter for struct se_device upon a successful
1058          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1059          *
1060          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1061          * action, the struct se_device->dev_reservation_lock will already be held,
1062          * so we do not call core_scsi3_pr_generation() which grabs the lock
1063          * for the REGISTER.
1064          */
1065         pr_reg->pr_res_generation = (register_move) ?
1066                         dev->t10_pr.pr_generation++ :
1067                         core_scsi3_pr_generation(dev);
1068
1069         spin_lock(&pr_tmpl->registration_lock);
1070         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1071
1072         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1073         spin_unlock(&pr_tmpl->registration_lock);
1074         /*
1075          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1076          */
1077         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1078                 goto out;
1079         /*
1080          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1081          * allocated in __core_scsi3_alloc_registration()
1082          */
1083         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1084                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1085                 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
1086
1087                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1088
1089                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1090
1091                 spin_lock(&pr_tmpl->registration_lock);
1092                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1093                               &pr_tmpl->registration_list);
1094
1095                 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
1096                                                register_type);
1097                 spin_unlock(&pr_tmpl->registration_lock);
1098                 /*
1099                  * Drop configfs group dependency reference and deve->pr_kref
1100                  * obtained from  __core_scsi3_alloc_registration() code.
1101                  */
1102                 rcu_read_lock();
1103                 deve = pr_reg_tmp->pr_reg_deve;
1104                 if (deve) {
1105                         set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1106                         core_scsi3_lunacl_undepend_item(deve);
1107                         pr_reg_tmp->pr_reg_deve = NULL;
1108                 }
1109                 rcu_read_unlock();
1110         }
1111 out:
1112         /*
1113          * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
1114          */
1115         rcu_read_lock();
1116         deve = pr_reg->pr_reg_deve;
1117         if (deve) {
1118                 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1119                 kref_put(&deve->pr_kref, target_pr_kref_release);
1120                 pr_reg->pr_reg_deve = NULL;
1121         }
1122         rcu_read_unlock();
1123 }
1124
1125 static int core_scsi3_alloc_registration(
1126         struct se_device *dev,
1127         struct se_node_acl *nacl,
1128         struct se_lun *lun,
1129         struct se_dev_entry *deve,
1130         u64 mapped_lun,
1131         unsigned char *isid,
1132         u64 sa_res_key,
1133         int all_tg_pt,
1134         int aptpl,
1135         enum register_type register_type,
1136         int register_move)
1137 {
1138         struct t10_pr_registration *pr_reg;
1139
1140         pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
1141                                                  isid, sa_res_key, all_tg_pt,
1142                                                  aptpl);
1143         if (!pr_reg)
1144                 return -EPERM;
1145
1146         __core_scsi3_add_registration(dev, nacl, pr_reg,
1147                         register_type, register_move);
1148         return 0;
1149 }
1150
1151 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1152         struct se_device *dev,
1153         struct se_node_acl *nacl,
1154         unsigned char *isid)
1155 {
1156         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1157         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1158
1159         spin_lock(&pr_tmpl->registration_lock);
1160         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1161                         &pr_tmpl->registration_list, pr_reg_list) {
1162                 /*
1163                  * First look for a matching struct se_node_acl
1164                  */
1165                 if (pr_reg->pr_reg_nacl != nacl)
1166                         continue;
1167
1168                 /*
1169                  * If this registration does NOT contain a fabric provided
1170                  * ISID, then we have found a match.
1171                  */
1172                 if (!pr_reg->isid_present_at_reg) {
1173                         atomic_inc_mb(&pr_reg->pr_res_holders);
1174                         spin_unlock(&pr_tmpl->registration_lock);
1175                         return pr_reg;
1176                 }
1177                 /*
1178                  * If the *pr_reg contains a fabric defined ISID for multi-value
1179                  * SCSI Initiator Port TransportIDs, then we expect a valid
1180                  * matching ISID to be provided by the local SCSI Initiator Port.
1181                  */
1182                 if (!isid)
1183                         continue;
1184                 if (strcmp(isid, pr_reg->pr_reg_isid))
1185                         continue;
1186
1187                 atomic_inc_mb(&pr_reg->pr_res_holders);
1188                 spin_unlock(&pr_tmpl->registration_lock);
1189                 return pr_reg;
1190         }
1191         spin_unlock(&pr_tmpl->registration_lock);
1192
1193         return NULL;
1194 }
1195
1196 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1197         struct se_device *dev,
1198         struct se_node_acl *nacl,
1199         struct se_session *sess)
1200 {
1201         struct se_portal_group *tpg = nacl->se_tpg;
1202         unsigned char buf[PR_REG_ISID_LEN] = { };
1203         unsigned char *isid_ptr = NULL;
1204
1205         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1206                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1207                                         PR_REG_ISID_LEN);
1208                 isid_ptr = &buf[0];
1209         }
1210
1211         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1212 }
1213
1214 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1215 {
1216         atomic_dec_mb(&pr_reg->pr_res_holders);
1217 }
1218
1219 static int core_scsi3_check_implicit_release(
1220         struct se_device *dev,
1221         struct t10_pr_registration *pr_reg)
1222 {
1223         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1224         struct t10_pr_registration *pr_res_holder;
1225         int ret = 0;
1226
1227         spin_lock(&dev->dev_reservation_lock);
1228         pr_res_holder = dev->dev_pr_res_holder;
1229         if (!pr_res_holder) {
1230                 spin_unlock(&dev->dev_reservation_lock);
1231                 return ret;
1232         }
1233         if (pr_res_holder == pr_reg) {
1234                 /*
1235                  * Perform an implicit RELEASE if the registration that
1236                  * is being released is holding the reservation.
1237                  *
1238                  * From spc4r17, section 5.7.11.1:
1239                  *
1240                  * e) If the I_T nexus is the persistent reservation holder
1241                  *    and the persistent reservation is not an all registrants
1242                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1243                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1244                  *    service action with the SERVICE ACTION RESERVATION KEY
1245                  *    field set to zero (see 5.7.11.3).
1246                  */
1247                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
1248                 ret = 1;
1249                 /*
1250                  * For 'All Registrants' reservation types, all existing
1251                  * registrations are still processed as reservation holders
1252                  * in core_scsi3_pr_seq_non_holder() after the initial
1253                  * reservation holder is implicitly released here.
1254                  */
1255         } else if (pr_reg->pr_reg_all_tg_pt &&
1256                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1257                           pr_reg->pr_reg_nacl->initiatorname)) &&
1258                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1259                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1260                         " UNREGISTER while existing reservation with matching"
1261                         " key 0x%016Lx is present from another SCSI Initiator"
1262                         " Port\n", pr_reg->pr_res_key);
1263                 ret = -EPERM;
1264         }
1265         spin_unlock(&dev->dev_reservation_lock);
1266
1267         return ret;
1268 }
1269
1270 static void __core_scsi3_free_registration(
1271         struct se_device *dev,
1272         struct t10_pr_registration *pr_reg,
1273         struct list_head *preempt_and_abort_list,
1274         int dec_holders)
1275         __releases(&pr_tmpl->registration_lock)
1276         __acquires(&pr_tmpl->registration_lock)
1277 {
1278         const struct target_core_fabric_ops *tfo =
1279                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1280         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1281         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1282         struct se_dev_entry *deve;
1283         char i_buf[PR_REG_ISID_ID_LEN] = { };
1284
1285         lockdep_assert_held(&pr_tmpl->registration_lock);
1286
1287         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1288
1289         if (!list_empty(&pr_reg->pr_reg_list))
1290                 list_del(&pr_reg->pr_reg_list);
1291         /*
1292          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1293          * so call core_scsi3_put_pr_reg() to decrement our reference.
1294          */
1295         if (dec_holders)
1296                 core_scsi3_put_pr_reg(pr_reg);
1297
1298         spin_unlock(&pr_tmpl->registration_lock);
1299         /*
1300          * Wait until all reference from any other I_T nexuses for this
1301          * *pr_reg have been released.  Because list_del() is called above,
1302          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1303          * count back to zero, and we release *pr_reg.
1304          */
1305         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1306                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1307                                 tfo->fabric_name);
1308                 cpu_relax();
1309         }
1310
1311         rcu_read_lock();
1312         deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
1313         if (deve)
1314                 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
1315         rcu_read_unlock();
1316
1317         spin_lock(&pr_tmpl->registration_lock);
1318         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1319                 " Node: %s%s\n", tfo->fabric_name,
1320                 pr_reg->pr_reg_nacl->initiatorname,
1321                 i_buf);
1322         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1323                 " Port(s)\n", tfo->fabric_name,
1324                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1325                 dev->transport->name);
1326         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1327                 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key,
1328                 pr_reg->pr_res_generation);
1329
1330         if (!preempt_and_abort_list) {
1331                 pr_reg->pr_reg_deve = NULL;
1332                 pr_reg->pr_reg_nacl = NULL;
1333                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1334                 return;
1335         }
1336         /*
1337          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1338          * are released once the ABORT_TASK_SET has completed..
1339          */
1340         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1341 }
1342
1343 void core_scsi3_free_pr_reg_from_nacl(
1344         struct se_device *dev,
1345         struct se_node_acl *nacl)
1346 {
1347         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1348         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1349         bool free_reg = false;
1350         /*
1351          * If the passed se_node_acl matches the reservation holder,
1352          * release the reservation.
1353          */
1354         spin_lock(&dev->dev_reservation_lock);
1355         pr_res_holder = dev->dev_pr_res_holder;
1356         if ((pr_res_holder != NULL) &&
1357             (pr_res_holder->pr_reg_nacl == nacl)) {
1358                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
1359                 free_reg = true;
1360         }
1361         spin_unlock(&dev->dev_reservation_lock);
1362         /*
1363          * Release any registration associated with the struct se_node_acl.
1364          */
1365         spin_lock(&pr_tmpl->registration_lock);
1366         if (pr_res_holder && free_reg)
1367                 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
1368
1369         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1370                         &pr_tmpl->registration_list, pr_reg_list) {
1371
1372                 if (pr_reg->pr_reg_nacl != nacl)
1373                         continue;
1374
1375                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1376         }
1377         spin_unlock(&pr_tmpl->registration_lock);
1378 }
1379
1380 void core_scsi3_free_all_registrations(
1381         struct se_device *dev)
1382 {
1383         struct t10_reservation *pr_tmpl = &dev->t10_pr;
1384         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1385
1386         spin_lock(&dev->dev_reservation_lock);
1387         pr_res_holder = dev->dev_pr_res_holder;
1388         if (pr_res_holder != NULL) {
1389                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1390                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1391                                                   pr_res_holder, 0, 0);
1392         }
1393         spin_unlock(&dev->dev_reservation_lock);
1394
1395         spin_lock(&pr_tmpl->registration_lock);
1396         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1397                         &pr_tmpl->registration_list, pr_reg_list) {
1398
1399                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1400         }
1401         spin_unlock(&pr_tmpl->registration_lock);
1402
1403         spin_lock(&pr_tmpl->aptpl_reg_lock);
1404         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1405                                 pr_reg_aptpl_list) {
1406                 list_del(&pr_reg->pr_reg_aptpl_list);
1407                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1408         }
1409         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1410 }
1411
1412 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1413 {
1414         return target_depend_item(&tpg->tpg_group.cg_item);
1415 }
1416
1417 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1418 {
1419         target_undepend_item(&tpg->tpg_group.cg_item);
1420         atomic_dec_mb(&tpg->tpg_pr_ref_count);
1421 }
1422
1423 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1424 {
1425         if (nacl->dynamic_node_acl)
1426                 return 0;
1427         return target_depend_item(&nacl->acl_group.cg_item);
1428 }
1429
1430 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1431 {
1432         if (!nacl->dynamic_node_acl)
1433                 target_undepend_item(&nacl->acl_group.cg_item);
1434         atomic_dec_mb(&nacl->acl_pr_ref_count);
1435 }
1436
1437 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1438 {
1439         /*
1440          * For nacl->dynamic_node_acl=1
1441          */
1442         if (!se_deve->se_lun_acl)
1443                 return 0;
1444
1445         return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
1446 }
1447
1448 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1449 {
1450         /*
1451          * For nacl->dynamic_node_acl=1
1452          */
1453         if (!se_deve->se_lun_acl) {
1454                 kref_put(&se_deve->pr_kref, target_pr_kref_release);
1455                 return;
1456         }
1457
1458         target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
1459         kref_put(&se_deve->pr_kref, target_pr_kref_release);
1460 }
1461
1462 static sense_reason_t
1463 core_scsi3_decode_spec_i_port(
1464         struct se_cmd *cmd,
1465         struct se_portal_group *tpg,
1466         unsigned char *l_isid,
1467         u64 sa_res_key,
1468         int all_tg_pt,
1469         int aptpl)
1470 {
1471         struct se_device *dev = cmd->se_dev;
1472         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1473         struct se_session *se_sess = cmd->se_sess;
1474         struct se_node_acl *dest_node_acl = NULL;
1475         struct se_dev_entry *dest_se_deve = NULL;
1476         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1477         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1478         LIST_HEAD(tid_dest_list);
1479         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1480         unsigned char *buf, *ptr, proto_ident;
1481         const unsigned char *i_str = NULL;
1482         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
1483         sense_reason_t ret;
1484         u32 tpdl, tid_len = 0;
1485         u32 dest_rtpi = 0;
1486
1487         /*
1488          * Allocate a struct pr_transport_id_holder and setup the
1489          * local_node_acl pointer and add to struct list_head tid_dest_list
1490          * for add registration processing in the loop of tid_dest_list below.
1491          */
1492         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1493         if (!tidh_new) {
1494                 pr_err("Unable to allocate tidh_new\n");
1495                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1496         }
1497         INIT_LIST_HEAD(&tidh_new->dest_list);
1498         tidh_new->dest_tpg = tpg;
1499         tidh_new->dest_node_acl = se_sess->se_node_acl;
1500
1501         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1502                                 se_sess->se_node_acl, cmd->se_lun,
1503                                 NULL, cmd->orig_fe_lun, l_isid,
1504                                 sa_res_key, all_tg_pt, aptpl);
1505         if (!local_pr_reg) {
1506                 kfree(tidh_new);
1507                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1508         }
1509
1510         if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
1511                 kfree(tidh_new);
1512                 kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
1513                          target_pr_kref_release);
1514                 kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
1515                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1516         }
1517
1518         tidh_new->dest_pr_reg = local_pr_reg;
1519         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1520
1521         if (cmd->data_length < 28) {
1522                 pr_warn("SPC-PR: Received PR OUT parameter list"
1523                         " length too small: %u\n", cmd->data_length);
1524                 ret = TCM_INVALID_PARAMETER_LIST;
1525                 goto out;
1526         }
1527
1528         buf = transport_kmap_data_sg(cmd);
1529         if (!buf) {
1530                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1531                 goto out;
1532         }
1533
1534         /*
1535          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1536          * first extract TransportID Parameter Data Length, and make sure
1537          * the value matches up to the SCSI expected data transfer length.
1538          */
1539         tpdl = get_unaligned_be32(&buf[24]);
1540
1541         if ((tpdl + 28) != cmd->data_length) {
1542                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1543                         " does not equal CDB data_length: %u\n", tpdl,
1544                         cmd->data_length);
1545                 ret = TCM_INVALID_PARAMETER_LIST;
1546                 goto out_unmap;
1547         }
1548         /*
1549          * Start processing the received transport IDs using the
1550          * receiving I_T Nexus portal's fabric dependent methods to
1551          * obtain the SCSI Initiator Port/Device Identifiers.
1552          */
1553         ptr = &buf[28];
1554
1555         while (tpdl > 0) {
1556                 struct se_lun *dest_lun, *tmp_lun;
1557
1558                 proto_ident = (ptr[0] & 0x0f);
1559                 dest_tpg = NULL;
1560
1561                 spin_lock(&dev->se_port_lock);
1562                 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
1563                         tmp_tpg = tmp_lun->lun_tpg;
1564
1565                         /*
1566                          * Look for the matching proto_ident provided by
1567                          * the received TransportID
1568                          */
1569                         if (tmp_tpg->proto_id != proto_ident)
1570                                 continue;
1571                         dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi;
1572
1573                         iport_ptr = NULL;
1574                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
1575                                         ptr, &tid_len, &iport_ptr);
1576                         if (!i_str)
1577                                 continue;
1578                         /*
1579                          * Determine if this SCSI device server requires that
1580                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1581                          * for fabric modules (iSCSI) requiring them.
1582                          */
1583                         if (tpg->se_tpg_tfo->sess_get_initiator_sid &&
1584                             dev->dev_attrib.enforce_pr_isids &&
1585                             !iport_ptr) {
1586                                 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",
1587                                         i_str);
1588                                 ret = TCM_INVALID_PARAMETER_LIST;
1589                                 spin_unlock(&dev->se_port_lock);
1590                                 goto out_unmap;
1591                         }
1592
1593                         atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1594                         spin_unlock(&dev->se_port_lock);
1595
1596                         if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1597                                 pr_err(" core_scsi3_tpg_depend_item()"
1598                                         " for tmp_tpg\n");
1599                                 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1600                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1601                                 goto out_unmap;
1602                         }
1603                         /*
1604                          * Locate the destination initiator ACL to be registered
1605                          * from the decoded fabric module specific TransportID
1606                          * at *i_str.
1607                          */
1608                         mutex_lock(&tmp_tpg->acl_node_mutex);
1609                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1610                                                 tmp_tpg, i_str);
1611                         if (dest_node_acl)
1612                                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1613                         mutex_unlock(&tmp_tpg->acl_node_mutex);
1614
1615                         if (!dest_node_acl) {
1616                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1617                                 spin_lock(&dev->se_port_lock);
1618                                 continue;
1619                         }
1620
1621                         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1622                                 pr_err("configfs_depend_item() failed"
1623                                         " for dest_node_acl->acl_group\n");
1624                                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1625                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1626                                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1627                                 goto out_unmap;
1628                         }
1629
1630                         dest_tpg = tmp_tpg;
1631                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",
1632                                 dest_tpg->se_tpg_tfo->fabric_name,
1633                                 dest_node_acl->initiatorname, dest_rtpi);
1634
1635                         spin_lock(&dev->se_port_lock);
1636                         break;
1637                 }
1638                 spin_unlock(&dev->se_port_lock);
1639
1640                 if (!dest_tpg) {
1641                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1642                                         " dest_tpg\n");
1643                         ret = TCM_INVALID_PARAMETER_LIST;
1644                         goto out_unmap;
1645                 }
1646
1647                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1648                         " tid_len: %d for %s + %s\n",
1649                         dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length,
1650                         tpdl, tid_len, i_str, iport_ptr);
1651
1652                 if (tid_len > tpdl) {
1653                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1654                                 " %u for Transport ID: %s\n", tid_len, ptr);
1655                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1656                         core_scsi3_tpg_undepend_item(dest_tpg);
1657                         ret = TCM_INVALID_PARAMETER_LIST;
1658                         goto out_unmap;
1659                 }
1660                 /*
1661                  * Locate the desintation struct se_dev_entry pointer for matching
1662                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1663                  * Target Port.
1664                  */
1665                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1666                                         dest_rtpi);
1667                 if (!dest_se_deve) {
1668                         pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n",
1669                                 dest_tpg->se_tpg_tfo->fabric_name,
1670                                 dest_rtpi);
1671
1672                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1673                         core_scsi3_tpg_undepend_item(dest_tpg);
1674                         ret = TCM_INVALID_PARAMETER_LIST;
1675                         goto out_unmap;
1676                 }
1677
1678                 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1679                         pr_err("core_scsi3_lunacl_depend_item()"
1680                                         " failed\n");
1681                         kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
1682                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1683                         core_scsi3_tpg_undepend_item(dest_tpg);
1684                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1685                         goto out_unmap;
1686                 }
1687
1688                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1689                         " dest_se_deve mapped_lun: %llu\n",
1690                         dest_tpg->se_tpg_tfo->fabric_name,
1691                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1692
1693                 /*
1694                  * Skip any TransportIDs that already have a registration for
1695                  * this target port.
1696                  */
1697                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1698                                         iport_ptr);
1699                 if (pr_reg_e) {
1700                         core_scsi3_put_pr_reg(pr_reg_e);
1701                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1702                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1703                         core_scsi3_tpg_undepend_item(dest_tpg);
1704                         ptr += tid_len;
1705                         tpdl -= tid_len;
1706                         tid_len = 0;
1707                         continue;
1708                 }
1709                 /*
1710                  * Allocate a struct pr_transport_id_holder and setup
1711                  * the dest_node_acl and dest_se_deve pointers for the
1712                  * loop below.
1713                  */
1714                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1715                                 GFP_KERNEL);
1716                 if (!tidh_new) {
1717                         pr_err("Unable to allocate tidh_new\n");
1718                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1719                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1720                         core_scsi3_tpg_undepend_item(dest_tpg);
1721                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1722                         goto out_unmap;
1723                 }
1724                 INIT_LIST_HEAD(&tidh_new->dest_list);
1725                 tidh_new->dest_tpg = dest_tpg;
1726                 tidh_new->dest_node_acl = dest_node_acl;
1727                 tidh_new->dest_se_deve = dest_se_deve;
1728
1729                 /*
1730                  * Allocate, but do NOT add the registration for the
1731                  * TransportID referenced SCSI Initiator port.  This
1732                  * done because of the following from spc4r17 in section
1733                  * 6.14.3 wrt SPEC_I_PT:
1734                  *
1735                  * "If a registration fails for any initiator port (e.g., if th
1736                  * logical unit does not have enough resources available to
1737                  * hold the registration information), no registrations shall be
1738                  * made, and the command shall be terminated with
1739                  * CHECK CONDITION status."
1740                  *
1741                  * That means we call __core_scsi3_alloc_registration() here,
1742                  * and then call __core_scsi3_add_registration() in the
1743                  * 2nd loop which will never fail.
1744                  */
1745                 dest_lun = dest_se_deve->se_lun;
1746
1747                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1748                                         dest_node_acl, dest_lun, dest_se_deve,
1749                                         dest_se_deve->mapped_lun, iport_ptr,
1750                                         sa_res_key, all_tg_pt, aptpl);
1751                 if (!dest_pr_reg) {
1752                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1753                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1754                         core_scsi3_tpg_undepend_item(dest_tpg);
1755                         kfree(tidh_new);
1756                         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
1757                         goto out_unmap;
1758                 }
1759                 tidh_new->dest_pr_reg = dest_pr_reg;
1760                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1761
1762                 ptr += tid_len;
1763                 tpdl -= tid_len;
1764                 tid_len = 0;
1765
1766         }
1767
1768         transport_kunmap_data_sg(cmd);
1769
1770         /*
1771          * Go ahead and create a registrations from tid_dest_list for the
1772          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1773          * and dest_se_deve.
1774          *
1775          * The SA Reservation Key from the PROUT is set for the
1776          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1777          * means that the TransportID Initiator port will be
1778          * registered on all of the target ports in the SCSI target device
1779          * ALL_TG_PT=0 means the registration will only be for the
1780          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1781          * was received.
1782          */
1783         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1784                 dest_tpg = tidh->dest_tpg;
1785                 dest_node_acl = tidh->dest_node_acl;
1786                 dest_se_deve = tidh->dest_se_deve;
1787                 dest_pr_reg = tidh->dest_pr_reg;
1788
1789                 list_del(&tidh->dest_list);
1790                 kfree(tidh);
1791
1792                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1793                 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1794
1795                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1796                                         dest_pr_reg, 0, 0);
1797
1798                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1799                         " registered Transport ID for Node: %s%s Mapped LUN:"
1800                         " %llu\n", dest_tpg->se_tpg_tfo->fabric_name,
1801                         dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
1802                         dest_se_deve->mapped_lun : 0);
1803
1804                 if (dest_pr_reg == local_pr_reg)
1805                         continue;
1806
1807                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1808                 core_scsi3_tpg_undepend_item(dest_tpg);
1809         }
1810
1811         return 0;
1812 out_unmap:
1813         transport_kunmap_data_sg(cmd);
1814 out:
1815         /*
1816          * For the failure case, release everything from tid_dest_list
1817          * including *dest_pr_reg and the configfs dependances..
1818          */
1819         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1820                 bool is_local = false;
1821
1822                 dest_tpg = tidh->dest_tpg;
1823                 dest_node_acl = tidh->dest_node_acl;
1824                 dest_se_deve = tidh->dest_se_deve;
1825                 dest_pr_reg = tidh->dest_pr_reg;
1826
1827                 if (dest_pr_reg == local_pr_reg)
1828                         is_local = true;
1829
1830                 list_del(&tidh->dest_list);
1831                 kfree(tidh);
1832                 /*
1833                  * Release any extra ALL_TG_PT=1 registrations for
1834                  * the SPEC_I_PT=1 case.
1835                  */
1836                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1837                                 &dest_pr_reg->pr_reg_atp_list,
1838                                 pr_reg_atp_mem_list) {
1839                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1840                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1841                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1842                 }
1843
1844                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1845                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1846
1847                 if (is_local)
1848                         continue;
1849
1850                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1851                 core_scsi3_tpg_undepend_item(dest_tpg);
1852         }
1853         return ret;
1854 }
1855
1856 static int core_scsi3_update_aptpl_buf(
1857         struct se_device *dev,
1858         unsigned char *buf,
1859         u32 pr_aptpl_buf_len)
1860 {
1861         struct se_portal_group *tpg;
1862         struct t10_pr_registration *pr_reg;
1863         unsigned char tmp[512], isid_buf[32];
1864         ssize_t len = 0;
1865         int reg_count = 0;
1866         int ret = 0;
1867
1868         spin_lock(&dev->dev_reservation_lock);
1869         spin_lock(&dev->t10_pr.registration_lock);
1870         /*
1871          * Walk the registration list..
1872          */
1873         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1874                         pr_reg_list) {
1875
1876                 tmp[0] = '\0';
1877                 isid_buf[0] = '\0';
1878                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1879                 /*
1880                  * Write out any ISID value to APTPL metadata that was included
1881                  * in the original registration.
1882                  */
1883                 if (pr_reg->isid_present_at_reg)
1884                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1885                                         pr_reg->pr_reg_isid);
1886                 /*
1887                  * Include special metadata if the pr_reg matches the
1888                  * reservation holder.
1889                  */
1890                 if (dev->dev_pr_res_holder == pr_reg) {
1891                         snprintf(tmp, 512, "PR_REG_START: %d"
1892                                 "\ninitiator_fabric=%s\n"
1893                                 "initiator_node=%s\n%s"
1894                                 "sa_res_key=%llu\n"
1895                                 "res_holder=1\nres_type=%02x\n"
1896                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1897                                 "mapped_lun=%llu\n", reg_count,
1898                                 tpg->se_tpg_tfo->fabric_name,
1899                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1900                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1901                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1902                                 pr_reg->pr_res_mapped_lun);
1903                 } else {
1904                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1905                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1906                                 "sa_res_key=%llu\nres_holder=0\n"
1907                                 "res_all_tg_pt=%d\nmapped_lun=%llu\n",
1908                                 reg_count, tpg->se_tpg_tfo->fabric_name,
1909                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1910                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1911                                 pr_reg->pr_res_mapped_lun);
1912                 }
1913
1914                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1915                         pr_err("Unable to update renaming APTPL metadata,"
1916                                " reallocating larger buffer\n");
1917                         ret = -EMSGSIZE;
1918                         goto out;
1919                 }
1920                 len += sprintf(buf+len, "%s", tmp);
1921
1922                 /*
1923                  * Include information about the associated SCSI target port.
1924                  */
1925                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1926                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
1927                         " %d\n", tpg->se_tpg_tfo->fabric_name,
1928                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1929                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1930                         pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
1931                         reg_count);
1932
1933                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1934                         pr_err("Unable to update renaming APTPL metadata,"
1935                                " reallocating larger buffer\n");
1936                         ret = -EMSGSIZE;
1937                         goto out;
1938                 }
1939                 len += sprintf(buf+len, "%s", tmp);
1940                 reg_count++;
1941         }
1942
1943         if (!reg_count)
1944                 len += sprintf(buf+len, "No Registrations or Reservations");
1945
1946 out:
1947         spin_unlock(&dev->t10_pr.registration_lock);
1948         spin_unlock(&dev->dev_reservation_lock);
1949
1950         return ret;
1951 }
1952
1953 static int __core_scsi3_write_aptpl_to_file(
1954         struct se_device *dev,
1955         unsigned char *buf)
1956 {
1957         struct t10_wwn *wwn = &dev->t10_wwn;
1958         struct file *file;
1959         int flags = O_RDWR | O_CREAT | O_TRUNC;
1960         char *path;
1961         u32 pr_aptpl_buf_len;
1962         int ret;
1963         loff_t pos = 0;
1964
1965         path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
1966                         &wwn->unit_serial[0]);
1967         if (!path)
1968                 return -ENOMEM;
1969
1970         file = filp_open(path, flags, 0600);
1971         if (IS_ERR(file)) {
1972                 pr_err("filp_open(%s) for APTPL metadata"
1973                         " failed\n", path);
1974                 kfree(path);
1975                 return PTR_ERR(file);
1976         }
1977
1978         pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1979
1980         ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
1981
1982         if (ret < 0)
1983                 pr_debug("Error writing APTPL metadata file: %s\n", path);
1984         fput(file);
1985         kfree(path);
1986
1987         return (ret < 0) ? -EIO : 0;
1988 }
1989
1990 /*
1991  * Clear the APTPL metadata if APTPL has been disabled, otherwise
1992  * write out the updated metadata to struct file for this SCSI device.
1993  */
1994 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1995 {
1996         unsigned char *buf;
1997         int rc, len = PR_APTPL_BUF_LEN;
1998
1999         if (!aptpl) {
2000                 char *null_buf = "No Registrations or Reservations\n";
2001
2002                 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
2003                 dev->t10_pr.pr_aptpl_active = 0;
2004                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
2005
2006                 if (rc)
2007                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2008
2009                 return 0;
2010         }
2011 retry:
2012         buf = vzalloc(len);
2013         if (!buf)
2014                 return TCM_OUT_OF_RESOURCES;
2015
2016         rc = core_scsi3_update_aptpl_buf(dev, buf, len);
2017         if (rc < 0) {
2018                 vfree(buf);
2019                 len *= 2;
2020                 goto retry;
2021         }
2022
2023         rc = __core_scsi3_write_aptpl_to_file(dev, buf);
2024         if (rc != 0) {
2025                 pr_err("SPC-3 PR: Could not update APTPL\n");
2026                 vfree(buf);
2027                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2028         }
2029         dev->t10_pr.pr_aptpl_active = 1;
2030         vfree(buf);
2031         pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
2032         return 0;
2033 }
2034
2035 static sense_reason_t
2036 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
2037                 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
2038 {
2039         struct se_session *se_sess = cmd->se_sess;
2040         struct se_device *dev = cmd->se_dev;
2041         struct se_lun *se_lun = cmd->se_lun;
2042         struct se_portal_group *se_tpg;
2043         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
2044         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2045         unsigned char isid_buf[PR_REG_ISID_LEN] = { };
2046         unsigned char *isid_ptr = NULL;
2047         sense_reason_t ret = TCM_NO_SENSE;
2048         int pr_holder = 0, type;
2049
2050         if (!se_sess || !se_lun) {
2051                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2052                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2053         }
2054         se_tpg = se_sess->se_tpg;
2055
2056         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2057                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2058                                 PR_REG_ISID_LEN);
2059                 isid_ptr = &isid_buf[0];
2060         }
2061         /*
2062          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2063          */
2064         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2065         if (!pr_reg) {
2066                 if (res_key) {
2067                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2068                                 " for SA REGISTER, returning CONFLICT\n");
2069                         return TCM_RESERVATION_CONFLICT;
2070                 }
2071                 /*
2072                  * Do nothing but return GOOD status.
2073                  */
2074                 if (!sa_res_key)
2075                         return 0;
2076
2077                 if (!spec_i_pt) {
2078                         /*
2079                          * Perform the Service Action REGISTER on the Initiator
2080                          * Port Endpoint that the PRO was received from on the
2081                          * Logical Unit of the SCSI device server.
2082                          */
2083                         if (core_scsi3_alloc_registration(cmd->se_dev,
2084                                         se_sess->se_node_acl, cmd->se_lun,
2085                                         NULL, cmd->orig_fe_lun, isid_ptr,
2086                                         sa_res_key, all_tg_pt, aptpl,
2087                                         register_type, 0)) {
2088                                 pr_err("Unable to allocate"
2089                                         " struct t10_pr_registration\n");
2090                                 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
2091                         }
2092                 } else {
2093                         /*
2094                          * Register both the Initiator port that received
2095                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2096                          * TransportID from Parameter list and loop through
2097                          * fabric dependent parameter list while calling
2098                          * logic from of core_scsi3_alloc_registration() for
2099                          * each TransportID provided SCSI Initiator Port/Device
2100                          */
2101                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2102                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2103                         if (ret != 0)
2104                                 return ret;
2105                 }
2106                 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2107         }
2108
2109         /* ok, existing registration */
2110
2111         if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2112                 pr_err("SPC-3 PR REGISTER: Received"
2113                        " res_key: 0x%016Lx does not match"
2114                        " existing SA REGISTER res_key:"
2115                        " 0x%016Lx\n", res_key,
2116                        pr_reg->pr_res_key);
2117                 ret = TCM_RESERVATION_CONFLICT;
2118                 goto out;
2119         }
2120
2121         if (spec_i_pt) {
2122                 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2123                         " set on a registered nexus\n");
2124                 ret = TCM_INVALID_PARAMETER_LIST;
2125                 goto out;
2126         }
2127
2128         /*
2129          * An existing ALL_TG_PT=1 registration being released
2130          * must also set ALL_TG_PT=1 in the incoming PROUT.
2131          */
2132         if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2133                 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2134                         " registration exists, but ALL_TG_PT=1 bit not"
2135                         " present in received PROUT\n");
2136                 ret = TCM_INVALID_CDB_FIELD;
2137                 goto out;
2138         }
2139
2140         /*
2141          * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2142          */
2143         if (sa_res_key) {
2144                 /*
2145                  * Increment PRgeneration counter for struct se_device"
2146                  * upon a successful REGISTER, see spc4r17 section 6.3.2
2147                  * READ_KEYS service action.
2148                  */
2149                 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2150                 pr_reg->pr_res_key = sa_res_key;
2151                 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2152                          " Key for %s to: 0x%016Lx PRgeneration:"
2153                          " 0x%08x\n", cmd->se_tfo->fabric_name,
2154                          (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2155                          pr_reg->pr_reg_nacl->initiatorname,
2156                          pr_reg->pr_res_key, pr_reg->pr_res_generation);
2157
2158         } else {
2159                 /*
2160                  * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2161                  */
2162                 type = pr_reg->pr_res_type;
2163                 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
2164                                                               pr_reg);
2165                 if (pr_holder < 0) {
2166                         ret = TCM_RESERVATION_CONFLICT;
2167                         goto out;
2168                 }
2169
2170                 spin_lock(&pr_tmpl->registration_lock);
2171                 /*
2172                  * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2173                  * and matching pr_res_key.
2174                  */
2175                 if (pr_reg->pr_reg_all_tg_pt) {
2176                         list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2177                                         &pr_tmpl->registration_list,
2178                                         pr_reg_list) {
2179
2180                                 if (!pr_reg_p->pr_reg_all_tg_pt)
2181                                         continue;
2182                                 if (pr_reg_p->pr_res_key != res_key)
2183                                         continue;
2184                                 if (pr_reg == pr_reg_p)
2185                                         continue;
2186                                 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2187                                            pr_reg_p->pr_reg_nacl->initiatorname))
2188                                         continue;
2189
2190                                 __core_scsi3_free_registration(dev,
2191                                                 pr_reg_p, NULL, 0);
2192                         }
2193                 }
2194
2195                 /*
2196                  * Release the calling I_T Nexus registration now..
2197                  */
2198                 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2199                 pr_reg = NULL;
2200
2201                 /*
2202                  * From spc4r17, section 5.7.11.3 Unregistering
2203                  *
2204                  * If the persistent reservation is a registrants only
2205                  * type, the device server shall establish a unit
2206                  * attention condition for the initiator port associated
2207                  * with every registered I_T nexus except for the I_T
2208                  * nexus on which the PERSISTENT RESERVE OUT command was
2209                  * received, with the additional sense code set to
2210                  * RESERVATIONS RELEASED.
2211                  */
2212                 if (pr_holder &&
2213                     (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2214                      type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2215                         list_for_each_entry(pr_reg_p,
2216                                         &pr_tmpl->registration_list,
2217                                         pr_reg_list) {
2218
2219                                 target_ua_allocate_lun(
2220                                         pr_reg_p->pr_reg_nacl,
2221                                         pr_reg_p->pr_res_mapped_lun,
2222                                         0x2A,
2223                                         ASCQ_2AH_RESERVATIONS_RELEASED);
2224                         }
2225                 }
2226
2227                 spin_unlock(&pr_tmpl->registration_lock);
2228         }
2229
2230         ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2231
2232 out:
2233         if (pr_reg)
2234                 core_scsi3_put_pr_reg(pr_reg);
2235         return ret;
2236 }
2237
2238 unsigned char *core_scsi3_pr_dump_type(int type)
2239 {
2240         switch (type) {
2241         case PR_TYPE_WRITE_EXCLUSIVE:
2242                 return "Write Exclusive Access";
2243         case PR_TYPE_EXCLUSIVE_ACCESS:
2244                 return "Exclusive Access";
2245         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2246                 return "Write Exclusive Access, Registrants Only";
2247         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2248                 return "Exclusive Access, Registrants Only";
2249         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2250                 return "Write Exclusive Access, All Registrants";
2251         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2252                 return "Exclusive Access, All Registrants";
2253         default:
2254                 break;
2255         }
2256
2257         return "Unknown SPC-3 PR Type";
2258 }
2259
2260 static sense_reason_t
2261 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2262 {
2263         struct se_device *dev = cmd->se_dev;
2264         struct se_session *se_sess = cmd->se_sess;
2265         struct se_lun *se_lun = cmd->se_lun;
2266         struct t10_pr_registration *pr_reg, *pr_res_holder;
2267         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2268         char i_buf[PR_REG_ISID_ID_LEN] = { };
2269         sense_reason_t ret;
2270
2271         if (!se_sess || !se_lun) {
2272                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2273                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2274         }
2275         /*
2276          * Locate the existing *pr_reg via struct se_node_acl pointers
2277          */
2278         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2279                                 se_sess);
2280         if (!pr_reg) {
2281                 pr_err("SPC-3 PR: Unable to locate"
2282                         " PR_REGISTERED *pr_reg for RESERVE\n");
2283                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2284         }
2285         /*
2286          * From spc4r17 Section 5.7.9: Reserving:
2287          *
2288          * An application client creates a persistent reservation by issuing
2289          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2290          * a registered I_T nexus with the following parameters:
2291          *    a) RESERVATION KEY set to the value of the reservation key that is
2292          *       registered with the logical unit for the I_T nexus; and
2293          */
2294         if (res_key != pr_reg->pr_res_key) {
2295                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2296                         " does not match existing SA REGISTER res_key:"
2297                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2298                 ret = TCM_RESERVATION_CONFLICT;
2299                 goto out_put_pr_reg;
2300         }
2301         /*
2302          * From spc4r17 Section 5.7.9: Reserving:
2303          *
2304          * From above:
2305          *  b) TYPE field and SCOPE field set to the persistent reservation
2306          *     being created.
2307          *
2308          * Only one persistent reservation is allowed at a time per logical unit
2309          * and that persistent reservation has a scope of LU_SCOPE.
2310          */
2311         if (scope != PR_SCOPE_LU_SCOPE) {
2312                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2313                 ret = TCM_INVALID_PARAMETER_LIST;
2314                 goto out_put_pr_reg;
2315         }
2316         /*
2317          * See if we have an existing PR reservation holder pointer at
2318          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2319          * *pr_res_holder.
2320          */
2321         spin_lock(&dev->dev_reservation_lock);
2322         pr_res_holder = dev->dev_pr_res_holder;
2323         if (pr_res_holder) {
2324                 /*
2325                  * From spc4r17 Section 5.7.9: Reserving:
2326                  *
2327                  * If the device server receives a PERSISTENT RESERVE OUT
2328                  * command from an I_T nexus other than a persistent reservation
2329                  * holder (see 5.7.10) that attempts to create a persistent
2330                  * reservation when a persistent reservation already exists for
2331                  * the logical unit, then the command shall be completed with
2332                  * RESERVATION CONFLICT status.
2333                  */
2334                 if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2335                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2336                         pr_err("SPC-3 PR: Attempted RESERVE from"
2337                                 " [%s]: %s while reservation already held by"
2338                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2339                                 cmd->se_tfo->fabric_name,
2340                                 se_sess->se_node_acl->initiatorname,
2341                                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2342                                 pr_res_holder->pr_reg_nacl->initiatorname);
2343
2344                         spin_unlock(&dev->dev_reservation_lock);
2345                         ret = TCM_RESERVATION_CONFLICT;
2346                         goto out_put_pr_reg;
2347                 }
2348                 /*
2349                  * From spc4r17 Section 5.7.9: Reserving:
2350                  *
2351                  * If a persistent reservation holder attempts to modify the
2352                  * type or scope of an existing persistent reservation, the
2353                  * command shall be completed with RESERVATION CONFLICT status.
2354                  */
2355                 if ((pr_res_holder->pr_res_type != type) ||
2356                     (pr_res_holder->pr_res_scope != scope)) {
2357                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2358                         pr_err("SPC-3 PR: Attempted RESERVE from"
2359                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2360                                 " while reservation already held by [%s]: %s,"
2361                                 " returning RESERVATION_CONFLICT\n",
2362                                 cmd->se_tfo->fabric_name,
2363                                 se_sess->se_node_acl->initiatorname,
2364                                 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2365                                 pr_res_holder->pr_reg_nacl->initiatorname);
2366
2367                         spin_unlock(&dev->dev_reservation_lock);
2368                         ret = TCM_RESERVATION_CONFLICT;
2369                         goto out_put_pr_reg;
2370                 }
2371                 /*
2372                  * From spc4r17 Section 5.7.9: Reserving:
2373                  *
2374                  * If the device server receives a PERSISTENT RESERVE OUT
2375                  * command with RESERVE service action where the TYPE field and
2376                  * the SCOPE field contain the same values as the existing type
2377                  * and scope from a persistent reservation holder, it shall not
2378                  * make any change to the existing persistent reservation and
2379                  * shall completethe command with GOOD status.
2380                  */
2381                 spin_unlock(&dev->dev_reservation_lock);
2382                 ret = 0;
2383                 goto out_put_pr_reg;
2384         }
2385         /*
2386          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2387          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2388          */
2389         pr_reg->pr_res_scope = scope;
2390         pr_reg->pr_res_type = type;
2391         pr_reg->pr_res_holder = 1;
2392         dev->dev_pr_res_holder = pr_reg;
2393         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2394
2395         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2396                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2397                 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),
2398                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2399         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2400                         cmd->se_tfo->fabric_name,
2401                         se_sess->se_node_acl->initiatorname,
2402                         i_buf);
2403         spin_unlock(&dev->dev_reservation_lock);
2404
2405         if (pr_tmpl->pr_aptpl_active)
2406                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2407
2408         ret = 0;
2409 out_put_pr_reg:
2410         core_scsi3_put_pr_reg(pr_reg);
2411         return ret;
2412 }
2413
2414 static sense_reason_t
2415 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2416                 u64 res_key)
2417 {
2418         switch (type) {
2419         case PR_TYPE_WRITE_EXCLUSIVE:
2420         case PR_TYPE_EXCLUSIVE_ACCESS:
2421         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2422         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2423         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2424         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2425                 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2426         default:
2427                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2428                         " 0x%02x\n", type);
2429                 return TCM_INVALID_CDB_FIELD;
2430         }
2431 }
2432
2433 static void __core_scsi3_complete_pro_release(
2434         struct se_device *dev,
2435         struct se_node_acl *se_nacl,
2436         struct t10_pr_registration *pr_reg,
2437         int explicit,
2438         int unreg)
2439 {
2440         const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2441         char i_buf[PR_REG_ISID_ID_LEN] = { };
2442         int pr_res_type = 0, pr_res_scope = 0;
2443
2444         lockdep_assert_held(&dev->dev_reservation_lock);
2445
2446         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2447         /*
2448          * Go ahead and release the current PR reservation holder.
2449          * If an All Registrants reservation is currently active and
2450          * a unregister operation is requested, replace the current
2451          * dev_pr_res_holder with another active registration.
2452          */
2453         if (dev->dev_pr_res_holder) {
2454                 pr_res_type = dev->dev_pr_res_holder->pr_res_type;
2455                 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
2456                 dev->dev_pr_res_holder->pr_res_type = 0;
2457                 dev->dev_pr_res_holder->pr_res_scope = 0;
2458                 dev->dev_pr_res_holder->pr_res_holder = 0;
2459                 dev->dev_pr_res_holder = NULL;
2460         }
2461         if (!unreg)
2462                 goto out;
2463
2464         spin_lock(&dev->t10_pr.registration_lock);
2465         list_del_init(&pr_reg->pr_reg_list);
2466         /*
2467          * If the I_T nexus is a reservation holder, the persistent reservation
2468          * is of an all registrants type, and the I_T nexus is the last remaining
2469          * registered I_T nexus, then the device server shall also release the
2470          * persistent reservation.
2471          */
2472         if (!list_empty(&dev->t10_pr.registration_list) &&
2473             ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2474              (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
2475                 dev->dev_pr_res_holder =
2476                         list_entry(dev->t10_pr.registration_list.next,
2477                                    struct t10_pr_registration, pr_reg_list);
2478                 dev->dev_pr_res_holder->pr_res_type = pr_res_type;
2479                 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
2480                 dev->dev_pr_res_holder->pr_res_holder = 1;
2481         }
2482         spin_unlock(&dev->t10_pr.registration_lock);
2483 out:
2484         if (!dev->dev_pr_res_holder) {
2485                 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2486                         " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2487                         tfo->fabric_name, (explicit) ? "explicit" :
2488                         "implicit", core_scsi3_pr_dump_type(pr_res_type),
2489                         (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2490         }
2491         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2492                 tfo->fabric_name, se_nacl->initiatorname,
2493                 i_buf);
2494         /*
2495          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2496          */
2497         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2498 }
2499
2500 static sense_reason_t
2501 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2502                 u64 res_key)
2503 {
2504         struct se_device *dev = cmd->se_dev;
2505         struct se_session *se_sess = cmd->se_sess;
2506         struct se_lun *se_lun = cmd->se_lun;
2507         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2508         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2509         sense_reason_t ret = 0;
2510
2511         if (!se_sess || !se_lun) {
2512                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2513                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2514         }
2515         /*
2516          * Locate the existing *pr_reg via struct se_node_acl pointers
2517          */
2518         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2519         if (!pr_reg) {
2520                 pr_err("SPC-3 PR: Unable to locate"
2521                         " PR_REGISTERED *pr_reg for RELEASE\n");
2522                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2523         }
2524         /*
2525          * From spc4r17 Section 5.7.11.2 Releasing:
2526          *
2527          * If there is no persistent reservation or in response to a persistent
2528          * reservation release request from a registered I_T nexus that is not a
2529          * persistent reservation holder (see 5.7.10), the device server shall
2530          * do the following:
2531          *
2532          *     a) Not release the persistent reservation, if any;
2533          *     b) Not remove any registrations; and
2534          *     c) Complete the command with GOOD status.
2535          */
2536         spin_lock(&dev->dev_reservation_lock);
2537         pr_res_holder = dev->dev_pr_res_holder;
2538         if (!pr_res_holder) {
2539                 /*
2540                  * No persistent reservation, return GOOD status.
2541                  */
2542                 spin_unlock(&dev->dev_reservation_lock);
2543                 goto out_put_pr_reg;
2544         }
2545
2546         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
2547                 /*
2548                  * Release request from a registered I_T nexus that is not a
2549                  * persistent reservation holder. return GOOD status.
2550                  */
2551                 spin_unlock(&dev->dev_reservation_lock);
2552                 goto out_put_pr_reg;
2553         }
2554
2555         /*
2556          * From spc4r17 Section 5.7.11.2 Releasing:
2557          *
2558          * Only the persistent reservation holder (see 5.7.10) is allowed to
2559          * release a persistent reservation.
2560          *
2561          * An application client releases the persistent reservation by issuing
2562          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2563          * an I_T nexus that is a persistent reservation holder with the
2564          * following parameters:
2565          *
2566          *     a) RESERVATION KEY field set to the value of the reservation key
2567          *        that is registered with the logical unit for the I_T nexus;
2568          */
2569         if (res_key != pr_reg->pr_res_key) {
2570                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2571                         " does not match existing SA REGISTER res_key:"
2572                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2573                 spin_unlock(&dev->dev_reservation_lock);
2574                 ret = TCM_RESERVATION_CONFLICT;
2575                 goto out_put_pr_reg;
2576         }
2577         /*
2578          * From spc4r17 Section 5.7.11.2 Releasing and above:
2579          *
2580          * b) TYPE field and SCOPE field set to match the persistent
2581          *    reservation being released.
2582          */
2583         if ((pr_res_holder->pr_res_type != type) ||
2584             (pr_res_holder->pr_res_scope != scope)) {
2585                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2586                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2587                         " reservation from [%s]: %s with different TYPE "
2588                         "and/or SCOPE  while reservation already held by"
2589                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2590                         cmd->se_tfo->fabric_name,
2591                         se_sess->se_node_acl->initiatorname,
2592                         pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
2593                         pr_res_holder->pr_reg_nacl->initiatorname);
2594
2595                 spin_unlock(&dev->dev_reservation_lock);
2596                 ret = TCM_RESERVATION_CONFLICT;
2597                 goto out_put_pr_reg;
2598         }
2599         /*
2600          * In response to a persistent reservation release request from the
2601          * persistent reservation holder the device server shall perform a
2602          * release by doing the following as an uninterrupted series of actions:
2603          * a) Release the persistent reservation;
2604          * b) Not remove any registration(s);
2605          * c) If the released persistent reservation is a registrants only type
2606          * or all registrants type persistent reservation,
2607          *    the device server shall establish a unit attention condition for
2608          *    the initiator port associated with every regis-
2609          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2610          *    RESERVE OUT command with RELEASE service action was received,
2611          *    with the additional sense code set to RESERVATIONS RELEASED; and
2612          * d) If the persistent reservation is of any other type, the device
2613          *    server shall not establish a unit attention condition.
2614          */
2615         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2616                                           pr_reg, 1, 0);
2617
2618         spin_unlock(&dev->dev_reservation_lock);
2619
2620         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2621             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2622             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2623             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2624                 /*
2625                  * If no UNIT ATTENTION conditions will be established for
2626                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2627                  * go ahead and check for APTPL=1 update+write below
2628                  */
2629                 goto write_aptpl;
2630         }
2631
2632         spin_lock(&pr_tmpl->registration_lock);
2633         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2634                         pr_reg_list) {
2635                 /*
2636                  * Do not establish a UNIT ATTENTION condition
2637                  * for the calling I_T Nexus
2638                  */
2639                 if (pr_reg_p == pr_reg)
2640                         continue;
2641
2642                 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
2643                                 pr_reg_p->pr_res_mapped_lun,
2644                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2645         }
2646         spin_unlock(&pr_tmpl->registration_lock);
2647
2648 write_aptpl:
2649         if (pr_tmpl->pr_aptpl_active)
2650                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2651
2652 out_put_pr_reg:
2653         core_scsi3_put_pr_reg(pr_reg);
2654         return ret;
2655 }
2656
2657 static sense_reason_t
2658 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2659 {
2660         struct se_device *dev = cmd->se_dev;
2661         struct se_node_acl *pr_reg_nacl;
2662         struct se_session *se_sess = cmd->se_sess;
2663         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2664         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2665         u64 pr_res_mapped_lun = 0;
2666         int calling_it_nexus = 0;
2667         /*
2668          * Locate the existing *pr_reg via struct se_node_acl pointers
2669          */
2670         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2671                         se_sess->se_node_acl, se_sess);
2672         if (!pr_reg_n) {
2673                 pr_err("SPC-3 PR: Unable to locate"
2674                         " PR_REGISTERED *pr_reg for CLEAR\n");
2675                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2676         }
2677         /*
2678          * From spc4r17 section 5.7.11.6, Clearing:
2679          *
2680          * Any application client may release the persistent reservation and
2681          * remove all registrations from a device server by issuing a
2682          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2683          * registered I_T nexus with the following parameter:
2684          *
2685          *      a) RESERVATION KEY field set to the value of the reservation key
2686          *         that is registered with the logical unit for the I_T nexus.
2687          */
2688         if (res_key != pr_reg_n->pr_res_key) {
2689                 pr_err("SPC-3 PR REGISTER: Received"
2690                         " res_key: 0x%016Lx does not match"
2691                         " existing SA REGISTER res_key:"
2692                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2693                 core_scsi3_put_pr_reg(pr_reg_n);
2694                 return TCM_RESERVATION_CONFLICT;
2695         }
2696         /*
2697          * a) Release the persistent reservation, if any;
2698          */
2699         spin_lock(&dev->dev_reservation_lock);
2700         pr_res_holder = dev->dev_pr_res_holder;
2701         if (pr_res_holder) {
2702                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2703                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2704                                                   pr_res_holder, 0, 0);
2705         }
2706         spin_unlock(&dev->dev_reservation_lock);
2707         /*
2708          * b) Remove all registration(s) (see spc4r17 5.7.7);
2709          */
2710         spin_lock(&pr_tmpl->registration_lock);
2711         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2712                         &pr_tmpl->registration_list, pr_reg_list) {
2713
2714                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2715                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2716                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2717                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2718                                         calling_it_nexus);
2719                 /*
2720                  * e) Establish a unit attention condition for the initiator
2721                  *    port associated with every registered I_T nexus other
2722                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2723                  *    command with CLEAR service action was received, with the
2724                  *    additional sense code set to RESERVATIONS PREEMPTED.
2725                  */
2726                 if (!calling_it_nexus)
2727                         target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
2728                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2729         }
2730         spin_unlock(&pr_tmpl->registration_lock);
2731
2732         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2733                 cmd->se_tfo->fabric_name);
2734
2735         core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2736
2737         core_scsi3_pr_generation(dev);
2738         return 0;
2739 }
2740
2741 static void __core_scsi3_complete_pro_preempt(
2742         struct se_device *dev,
2743         struct t10_pr_registration *pr_reg,
2744         struct list_head *preempt_and_abort_list,
2745         int type,
2746         int scope,
2747         enum preempt_type preempt_type)
2748 {
2749         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2750         const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2751         char i_buf[PR_REG_ISID_ID_LEN] = { };
2752
2753         lockdep_assert_held(&dev->dev_reservation_lock);
2754
2755         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2756         /*
2757          * Do an implicit RELEASE of the existing reservation.
2758          */
2759         if (dev->dev_pr_res_holder)
2760                 __core_scsi3_complete_pro_release(dev, nacl,
2761                                                   dev->dev_pr_res_holder, 0, 0);
2762
2763         dev->dev_pr_res_holder = pr_reg;
2764         pr_reg->pr_res_holder = 1;
2765         pr_reg->pr_res_type = type;
2766         pr_reg->pr_res_scope = scope;
2767
2768         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2769                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2770                 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2771                 core_scsi3_pr_dump_type(type),
2772                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2773         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2774                 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2775                 nacl->initiatorname, i_buf);
2776         /*
2777          * For PREEMPT_AND_ABORT, add the preempting reservation's
2778          * struct t10_pr_registration to the list that will be compared
2779          * against received CDBs..
2780          */
2781         if (preempt_and_abort_list)
2782                 list_add_tail(&pr_reg->pr_reg_abort_list,
2783                                 preempt_and_abort_list);
2784 }
2785
2786 static void core_scsi3_release_preempt_and_abort(
2787         struct list_head *preempt_and_abort_list,
2788         struct t10_pr_registration *pr_reg_holder)
2789 {
2790         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2791
2792         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2793                                 pr_reg_abort_list) {
2794
2795                 list_del(&pr_reg->pr_reg_abort_list);
2796                 if (pr_reg_holder == pr_reg)
2797                         continue;
2798                 if (pr_reg->pr_res_holder) {
2799                         pr_warn("pr_reg->pr_res_holder still set\n");
2800                         continue;
2801                 }
2802
2803                 pr_reg->pr_reg_deve = NULL;
2804                 pr_reg->pr_reg_nacl = NULL;
2805                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2806         }
2807 }
2808
2809 static sense_reason_t
2810 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2811                 u64 sa_res_key, enum preempt_type preempt_type)
2812 {
2813         struct se_device *dev = cmd->se_dev;
2814         struct se_node_acl *pr_reg_nacl;
2815         struct se_session *se_sess = cmd->se_sess;
2816         LIST_HEAD(preempt_and_abort_list);
2817         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2818         struct t10_reservation *pr_tmpl = &dev->t10_pr;
2819         u64 pr_res_mapped_lun = 0;
2820         int all_reg = 0, calling_it_nexus = 0;
2821         bool sa_res_key_unmatched = sa_res_key != 0;
2822         int prh_type = 0, prh_scope = 0;
2823
2824         if (!se_sess)
2825                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2826
2827         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2828                                 se_sess);
2829         if (!pr_reg_n) {
2830                 pr_err("SPC-3 PR: Unable to locate"
2831                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2832                         (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2833                 return TCM_RESERVATION_CONFLICT;
2834         }
2835         if (pr_reg_n->pr_res_key != res_key) {
2836                 core_scsi3_put_pr_reg(pr_reg_n);
2837                 return TCM_RESERVATION_CONFLICT;
2838         }
2839         if (scope != PR_SCOPE_LU_SCOPE) {
2840                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2841                 core_scsi3_put_pr_reg(pr_reg_n);
2842                 return TCM_INVALID_PARAMETER_LIST;
2843         }
2844
2845         spin_lock(&dev->dev_reservation_lock);
2846         pr_res_holder = dev->dev_pr_res_holder;
2847         if (pr_res_holder &&
2848            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2849             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2850                 all_reg = 1;
2851
2852         if (!all_reg && !sa_res_key) {
2853                 spin_unlock(&dev->dev_reservation_lock);
2854                 core_scsi3_put_pr_reg(pr_reg_n);
2855                 return TCM_INVALID_PARAMETER_LIST;
2856         }
2857         /*
2858          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2859          *
2860          * If the SERVICE ACTION RESERVATION KEY field does not identify a
2861          * persistent reservation holder or there is no persistent reservation
2862          * holder (i.e., there is no persistent reservation), then the device
2863          * server shall perform a preempt by doing the following in an
2864          * uninterrupted series of actions. (See below..)
2865          */
2866         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2867                 /*
2868                  * No existing or SA Reservation Key matching reservations..
2869                  *
2870                  * PROUT SA PREEMPT with All Registrant type reservations are
2871                  * allowed to be processed without a matching SA Reservation Key
2872                  */
2873                 spin_lock(&pr_tmpl->registration_lock);
2874                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2875                                 &pr_tmpl->registration_list, pr_reg_list) {
2876                         /*
2877                          * Removing of registrations in non all registrants
2878                          * type reservations without a matching SA reservation
2879                          * key.
2880                          *
2881                          * a) Remove the registrations for all I_T nexuses
2882                          *    specified by the SERVICE ACTION RESERVATION KEY
2883                          *    field;
2884                          * b) Ignore the contents of the SCOPE and TYPE fields;
2885                          * c) Process tasks as defined in 5.7.1; and
2886                          * d) Establish a unit attention condition for the
2887                          *    initiator port associated with every I_T nexus
2888                          *    that lost its registration other than the I_T
2889                          *    nexus on which the PERSISTENT RESERVE OUT command
2890                          *    was received, with the additional sense code set
2891                          *    to REGISTRATIONS PREEMPTED.
2892                          */
2893                         if (!all_reg) {
2894                                 if (pr_reg->pr_res_key != sa_res_key)
2895                                         continue;
2896                                 sa_res_key_unmatched = false;
2897
2898                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2899                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2900                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2901                                 __core_scsi3_free_registration(dev, pr_reg,
2902                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2903                                                 NULL, calling_it_nexus);
2904                         } else {
2905                                 /*
2906                                  * Case for any existing all registrants type
2907                                  * reservation, follow logic in spc4r17 section
2908                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
2909                                  *
2910                                  * For a ZERO SA Reservation key, release
2911                                  * all other registrations and do an implicit
2912                                  * release of active persistent reservation.
2913                                  *
2914                                  * For a non-ZERO SA Reservation key, only
2915                                  * release the matching reservation key from
2916                                  * registrations.
2917                                  */
2918                                 if ((sa_res_key) &&
2919                                      (pr_reg->pr_res_key != sa_res_key))
2920                                         continue;
2921                                 sa_res_key_unmatched = false;
2922
2923                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2924                                 if (calling_it_nexus)
2925                                         continue;
2926
2927                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2928                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2929                                 __core_scsi3_free_registration(dev, pr_reg,
2930                                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2931                                                 NULL, 0);
2932                         }
2933                         if (!calling_it_nexus)
2934                                 target_ua_allocate_lun(pr_reg_nacl,
2935                                         pr_res_mapped_lun, 0x2A,
2936                                         ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2937                 }
2938                 spin_unlock(&pr_tmpl->registration_lock);
2939                 /*
2940                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2941                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2942                  * RESERVATION KEY field to a value that does not match any
2943                  * registered reservation key, then the device server shall
2944                  * complete the command with RESERVATION CONFLICT status.
2945                  */
2946                 if (sa_res_key_unmatched) {
2947                         spin_unlock(&dev->dev_reservation_lock);
2948                         core_scsi3_put_pr_reg(pr_reg_n);
2949                         return TCM_RESERVATION_CONFLICT;
2950                 }
2951                 /*
2952                  * For an existing all registrants type reservation
2953                  * with a zero SA rservation key, preempt the existing
2954                  * reservation with the new PR type and scope.
2955                  */
2956                 if (pr_res_holder && all_reg && !(sa_res_key)) {
2957                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2958                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2959                                 type, scope, preempt_type);
2960                 }
2961
2962                 spin_unlock(&dev->dev_reservation_lock);
2963
2964                 /*
2965                  * SPC-4 5.12.11.2.6 Preempting and aborting
2966                  * The actions described in this subclause shall be performed
2967                  * for all I_T nexuses that are registered with the non-zero
2968                  * SERVICE ACTION RESERVATION KEY value, without regard for
2969                  * whether the preempted I_T nexuses hold the persistent
2970                  * reservation. If the SERVICE ACTION RESERVATION KEY field is
2971                  * set to zero and an all registrants persistent reservation is
2972                  * present, the device server shall abort all commands for all
2973                  * registered I_T nexuses.
2974                  */
2975                 if (preempt_type == PREEMPT_AND_ABORT) {
2976                         core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list,
2977                                            cmd);
2978                         core_scsi3_release_preempt_and_abort(
2979                                 &preempt_and_abort_list, pr_reg_n);
2980                 }
2981
2982                 if (pr_tmpl->pr_aptpl_active)
2983                         core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2984
2985                 core_scsi3_put_pr_reg(pr_reg_n);
2986                 core_scsi3_pr_generation(cmd->se_dev);
2987                 return 0;
2988         }
2989         /*
2990          * The PREEMPTing SA reservation key matches that of the
2991          * existing persistent reservation, first, we check if
2992          * we are preempting our own reservation.
2993          * From spc4r17, section 5.7.11.4.3 Preempting
2994          * persistent reservations and registration handling
2995          *
2996          * If an all registrants persistent reservation is not
2997          * present, it is not an error for the persistent
2998          * reservation holder to preempt itself (i.e., a
2999          * PERSISTENT RESERVE OUT with a PREEMPT service action
3000          * or a PREEMPT AND ABORT service action with the
3001          * SERVICE ACTION RESERVATION KEY value equal to the
3002          * persistent reservation holder's reservation key that
3003          * is received from the persistent reservation holder).
3004          * In that case, the device server shall establish the
3005          * new persistent reservation and maintain the
3006          * registration.
3007          */
3008         prh_type = pr_res_holder->pr_res_type;
3009         prh_scope = pr_res_holder->pr_res_scope;
3010         /*
3011          * If the SERVICE ACTION RESERVATION KEY field identifies a
3012          * persistent reservation holder (see 5.7.10), the device
3013          * server shall perform a preempt by doing the following as
3014          * an uninterrupted series of actions:
3015          *
3016          * a) Release the persistent reservation for the holder
3017          *    identified by the SERVICE ACTION RESERVATION KEY field;
3018          */
3019         if (pr_reg_n != pr_res_holder)
3020                 __core_scsi3_complete_pro_release(dev,
3021                                                   pr_res_holder->pr_reg_nacl,
3022                                                   dev->dev_pr_res_holder, 0, 0);
3023         /*
3024          * b) Remove the registrations for all I_T nexuses identified
3025          *    by the SERVICE ACTION RESERVATION KEY field, except the
3026          *    I_T nexus that is being used for the PERSISTENT RESERVE
3027          *    OUT command. If an all registrants persistent reservation
3028          *    is present and the SERVICE ACTION RESERVATION KEY field
3029          *    is set to zero, then all registrations shall be removed
3030          *    except for that of the I_T nexus that is being used for
3031          *    the PERSISTENT RESERVE OUT command;
3032          */
3033         spin_lock(&pr_tmpl->registration_lock);
3034         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3035                         &pr_tmpl->registration_list, pr_reg_list) {
3036
3037                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3038                 if (calling_it_nexus)
3039                         continue;
3040
3041                 if (sa_res_key && pr_reg->pr_res_key != sa_res_key)
3042                         continue;
3043
3044                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3045                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3046                 __core_scsi3_free_registration(dev, pr_reg,
3047                                 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3048                                 calling_it_nexus);
3049                 /*
3050                  * e) Establish a unit attention condition for the initiator
3051                  *    port associated with every I_T nexus that lost its
3052                  *    persistent reservation and/or registration, with the
3053                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3054                  */
3055                 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3056                                 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
3057         }
3058         spin_unlock(&pr_tmpl->registration_lock);
3059         /*
3060          * c) Establish a persistent reservation for the preempting
3061          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3062          */
3063         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3064                         (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
3065                         type, scope, preempt_type);
3066         /*
3067          * d) Process tasks as defined in 5.7.1;
3068          * e) See above..
3069          * f) If the type or scope has changed, then for every I_T nexus
3070          *    whose reservation key was not removed, except for the I_T
3071          *    nexus on which the PERSISTENT RESERVE OUT command was
3072          *    received, the device server shall establish a unit
3073          *    attention condition for the initiator port associated with
3074          *    that I_T nexus, with the additional sense code set to
3075          *    RESERVATIONS RELEASED. If the type or scope have not
3076          *    changed, then no unit attention condition(s) shall be
3077          *    established for this reason.
3078          */
3079         if ((prh_type != type) || (prh_scope != scope)) {
3080                 spin_lock(&pr_tmpl->registration_lock);
3081                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3082                                 &pr_tmpl->registration_list, pr_reg_list) {
3083
3084                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3085                         if (calling_it_nexus)
3086                                 continue;
3087
3088                         target_ua_allocate_lun(pr_reg->pr_reg_nacl,
3089                                         pr_reg->pr_res_mapped_lun, 0x2A,
3090                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3091                 }
3092                 spin_unlock(&pr_tmpl->registration_lock);
3093         }
3094         spin_unlock(&dev->dev_reservation_lock);
3095         /*
3096          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3097          * All received CDBs for the matching existing reservation and
3098          * registrations undergo ABORT_TASK logic.
3099          *
3100          * From there, core_scsi3_release_preempt_and_abort() will
3101          * release every registration in the list (which have already
3102          * been removed from the primary pr_reg list), except the
3103          * new persistent reservation holder, the calling Initiator Port.
3104          */
3105         if (preempt_type == PREEMPT_AND_ABORT) {
3106                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3107                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3108                                                 pr_reg_n);
3109         }
3110
3111         if (pr_tmpl->pr_aptpl_active)
3112                 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3113
3114         core_scsi3_put_pr_reg(pr_reg_n);
3115         core_scsi3_pr_generation(cmd->se_dev);
3116         return 0;
3117 }
3118
3119 static sense_reason_t
3120 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3121                 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3122 {
3123         switch (type) {
3124         case PR_TYPE_WRITE_EXCLUSIVE:
3125         case PR_TYPE_EXCLUSIVE_ACCESS:
3126         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3127         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3128         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3129         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3130                 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3131                                               sa_res_key, preempt_type);
3132         default:
3133                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3134                         " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3135                 return TCM_INVALID_CDB_FIELD;
3136         }
3137 }
3138
3139
3140 static sense_reason_t
3141 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3142                 u64 sa_res_key, int aptpl, int unreg)
3143 {
3144         struct se_session *se_sess = cmd->se_sess;
3145         struct se_device *dev = cmd->se_dev;
3146         struct se_dev_entry *dest_se_deve = NULL;
3147         struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
3148         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3149         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3150         const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3151         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3152         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3153         unsigned char *buf;
3154         const unsigned char *initiator_str;
3155         char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
3156         u32 tid_len, tmp_tid_len;
3157         int new_reg = 0, type, scope, matching_iname;
3158         sense_reason_t ret;
3159         unsigned short rtpi;
3160         unsigned char proto_ident;
3161
3162         if (!se_sess || !se_lun) {
3163                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3164                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3165         }
3166
3167         se_tpg = se_sess->se_tpg;
3168         tf_ops = se_tpg->se_tpg_tfo;
3169         /*
3170          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3171          *      Register behaviors for a REGISTER AND MOVE service action
3172          *
3173          * Locate the existing *pr_reg via struct se_node_acl pointers
3174          */
3175         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3176                                 se_sess);
3177         if (!pr_reg) {
3178                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3179                         " *pr_reg for REGISTER_AND_MOVE\n");
3180                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3181         }
3182         /*
3183          * The provided reservation key much match the existing reservation key
3184          * provided during this initiator's I_T nexus registration.
3185          */
3186         if (res_key != pr_reg->pr_res_key) {
3187                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3188                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3189                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3190                 ret = TCM_RESERVATION_CONFLICT;
3191                 goto out_put_pr_reg;
3192         }
3193         /*
3194          * The service active reservation key needs to be non zero
3195          */
3196         if (!sa_res_key) {
3197                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3198                         " sa_res_key\n");
3199                 ret = TCM_INVALID_PARAMETER_LIST;
3200                 goto out_put_pr_reg;
3201         }
3202
3203         /*
3204          * Determine the Relative Target Port Identifier where the reservation
3205          * will be moved to for the TransportID containing SCSI initiator WWN
3206          * information.
3207          */
3208         buf = transport_kmap_data_sg(cmd);
3209         if (!buf) {
3210                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3211                 goto out_put_pr_reg;
3212         }
3213
3214         rtpi = get_unaligned_be16(&buf[18]);
3215         tid_len = get_unaligned_be32(&buf[20]);
3216         transport_kunmap_data_sg(cmd);
3217         buf = NULL;
3218
3219         if ((tid_len + 24) != cmd->data_length) {
3220                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3221                         " does not equal CDB data_length: %u\n", tid_len,
3222                         cmd->data_length);
3223                 ret = TCM_INVALID_PARAMETER_LIST;
3224                 goto out_put_pr_reg;
3225         }
3226
3227         spin_lock(&dev->se_port_lock);
3228         list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
3229                 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi)
3230                         continue;
3231                 dest_se_tpg = tmp_lun->lun_tpg;
3232                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3233                 if (!dest_tf_ops)
3234                         continue;
3235
3236                 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3237                 spin_unlock(&dev->se_port_lock);
3238
3239                 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3240                         pr_err("core_scsi3_tpg_depend_item() failed"
3241                                 " for dest_se_tpg\n");
3242                         atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3243                         ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3244                         goto out_put_pr_reg;
3245                 }
3246
3247                 spin_lock(&dev->se_port_lock);
3248                 break;
3249         }
3250         spin_unlock(&dev->se_port_lock);
3251
3252         if (!dest_se_tpg || !dest_tf_ops) {
3253                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3254                         " fabric ops from Relative Target Port Identifier:"
3255                         " %hu\n", rtpi);
3256                 ret = TCM_INVALID_PARAMETER_LIST;
3257                 goto out_put_pr_reg;
3258         }
3259
3260         buf = transport_kmap_data_sg(cmd);
3261         if (!buf) {
3262                 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3263                 goto out_put_pr_reg;
3264         }
3265         proto_ident = (buf[24] & 0x0f);
3266
3267         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3268                         " 0x%02x\n", proto_ident);
3269
3270         if (proto_ident != dest_se_tpg->proto_id) {
3271                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3272                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3273                         " from fabric: %s\n", proto_ident,
3274                         dest_se_tpg->proto_id,
3275                         dest_tf_ops->fabric_name);
3276                 ret = TCM_INVALID_PARAMETER_LIST;
3277                 goto out;
3278         }
3279         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
3280                         &buf[24], &tmp_tid_len, &iport_ptr);
3281         if (!initiator_str) {
3282                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3283                         " initiator_str from Transport ID\n");
3284                 ret = TCM_INVALID_PARAMETER_LIST;
3285                 goto out;
3286         }
3287
3288         transport_kunmap_data_sg(cmd);
3289         buf = NULL;
3290
3291         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3292                 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?
3293                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3294                 iport_ptr : "");
3295         /*
3296          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3297          * action specifies a TransportID that is the same as the initiator port
3298          * of the I_T nexus for the command received, then the command shall
3299          * be terminated with CHECK CONDITION status, with the sense key set to
3300          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3301          * IN PARAMETER LIST.
3302          */
3303         pr_reg_nacl = pr_reg->pr_reg_nacl;
3304         matching_iname = (!strcmp(initiator_str,
3305                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3306         if (!matching_iname)
3307                 goto after_iport_check;
3308
3309         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3310                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3311                         " matches: %s on received I_T Nexus\n", initiator_str,
3312                         pr_reg_nacl->initiatorname);
3313                 ret = TCM_INVALID_PARAMETER_LIST;
3314                 goto out;
3315         }
3316         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3317                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3318                         " matches: %s %s on received I_T Nexus\n",
3319                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3320                         pr_reg->pr_reg_isid);
3321                 ret = TCM_INVALID_PARAMETER_LIST;
3322                 goto out;
3323         }
3324 after_iport_check:
3325         /*
3326          * Locate the destination struct se_node_acl from the received Transport ID
3327          */
3328         mutex_lock(&dest_se_tpg->acl_node_mutex);
3329         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3330                                 initiator_str);
3331         if (dest_node_acl)
3332                 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3333         mutex_unlock(&dest_se_tpg->acl_node_mutex);
3334
3335         if (!dest_node_acl) {
3336                 pr_err("Unable to locate %s dest_node_acl for"
3337                         " TransportID%s\n", dest_tf_ops->fabric_name,
3338                         initiator_str);
3339                 ret = TCM_INVALID_PARAMETER_LIST;
3340                 goto out;
3341         }
3342
3343         if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3344                 pr_err("core_scsi3_nodeacl_depend_item() for"
3345                         " dest_node_acl\n");
3346                 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3347                 dest_node_acl = NULL;
3348                 ret = TCM_INVALID_PARAMETER_LIST;
3349                 goto out;
3350         }
3351
3352         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3353                 " %s from TransportID\n", dest_tf_ops->fabric_name,
3354                 dest_node_acl->initiatorname);
3355
3356         /*
3357          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3358          * PORT IDENTIFIER.
3359          */
3360         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3361         if (!dest_se_deve) {
3362                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3363                         " %hu\n",  dest_tf_ops->fabric_name, rtpi);
3364                 ret = TCM_INVALID_PARAMETER_LIST;
3365                 goto out;
3366         }
3367
3368         if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3369                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3370                 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
3371                 dest_se_deve = NULL;
3372                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3373                 goto out;
3374         }
3375
3376         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3377                 " ACL for dest_se_deve->mapped_lun: %llu\n",
3378                 dest_tf_ops->fabric_name, dest_node_acl->initiatorname,
3379                 dest_se_deve->mapped_lun);
3380
3381         /*
3382          * A persistent reservation needs to already existing in order to
3383          * successfully complete the REGISTER_AND_MOVE service action..
3384          */
3385         spin_lock(&dev->dev_reservation_lock);
3386         pr_res_holder = dev->dev_pr_res_holder;
3387         if (!pr_res_holder) {
3388                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3389                         " currently held\n");
3390                 spin_unlock(&dev->dev_reservation_lock);
3391                 ret = TCM_INVALID_CDB_FIELD;
3392                 goto out;
3393         }
3394         /*
3395          * The received on I_T Nexus must be the reservation holder.
3396          *
3397          * From spc4r17 section 5.7.8  Table 50 --
3398          *      Register behaviors for a REGISTER AND MOVE service action
3399          */
3400         if (!is_reservation_holder(pr_res_holder, pr_reg)) {
3401                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3402                         " Nexus is not reservation holder\n");
3403                 spin_unlock(&dev->dev_reservation_lock);
3404                 ret = TCM_RESERVATION_CONFLICT;
3405                 goto out;
3406         }
3407         /*
3408          * From spc4r17 section 5.7.8: registering and moving reservation
3409          *
3410          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3411          * action is received and the established persistent reservation is a
3412          * Write Exclusive - All Registrants type or Exclusive Access -
3413          * All Registrants type reservation, then the command shall be completed
3414          * with RESERVATION CONFLICT status.
3415          */
3416         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3417             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3418                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3419                         " reservation for type: %s\n",
3420                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3421                 spin_unlock(&dev->dev_reservation_lock);
3422                 ret = TCM_RESERVATION_CONFLICT;
3423                 goto out;
3424         }
3425         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3426         /*
3427          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3428          */
3429         type = pr_res_holder->pr_res_type;
3430         scope = pr_res_holder->pr_res_type;
3431         /*
3432          * c) Associate the reservation key specified in the SERVICE ACTION
3433          *    RESERVATION KEY field with the I_T nexus specified as the
3434          *    destination of the register and move, where:
3435          *    A) The I_T nexus is specified by the TransportID and the
3436          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3437          *    B) Regardless of the TransportID format used, the association for
3438          *       the initiator port is based on either the initiator port name
3439          *       (see 3.1.71) on SCSI transport protocols where port names are
3440          *       required or the initiator port identifier (see 3.1.70) on SCSI
3441          *       transport protocols where port names are not required;
3442          * d) Register the reservation key specified in the SERVICE ACTION
3443          *    RESERVATION KEY field;
3444          *
3445          * Also, It is not an error for a REGISTER AND MOVE service action to
3446          * register an I_T nexus that is already registered with the same
3447          * reservation key or a different reservation key.
3448          */
3449         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3450                                         iport_ptr);
3451         if (!dest_pr_reg) {
3452                 struct se_lun *dest_lun = dest_se_deve->se_lun;
3453
3454                 spin_unlock(&dev->dev_reservation_lock);
3455                 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
3456                                         dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
3457                                         iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
3458                         ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
3459                         goto out;
3460                 }
3461                 spin_lock(&dev->dev_reservation_lock);
3462                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3463                                                 iport_ptr);
3464                 new_reg = 1;
3465         } else {
3466                 /*
3467                  * e) Retain the reservation key specified in the SERVICE ACTION
3468                  *    RESERVATION KEY field and associated information;
3469                  */
3470                 dest_pr_reg->pr_res_key = sa_res_key;
3471         }
3472         /*
3473          * f) Release the persistent reservation for the persistent reservation
3474          *    holder (i.e., the I_T nexus on which the
3475          */
3476         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3477                                           dev->dev_pr_res_holder, 0, 0);
3478         /*
3479          * g) Move the persistent reservation to the specified I_T nexus using
3480          *    the same scope and type as the persistent reservation released in
3481          *    item f); and
3482          */
3483         dev->dev_pr_res_holder = dest_pr_reg;
3484         dest_pr_reg->pr_res_holder = 1;
3485         dest_pr_reg->pr_res_type = type;
3486         pr_reg->pr_res_scope = scope;
3487         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3488         /*
3489          * Increment PRGeneration for existing registrations..
3490          */
3491         if (!new_reg)
3492                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3493         spin_unlock(&dev->dev_reservation_lock);
3494
3495         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3496                 " created new reservation holder TYPE: %s on object RTPI:"
3497                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,
3498                 core_scsi3_pr_dump_type(type), rtpi,
3499                 dest_pr_reg->pr_res_generation);
3500         pr_debug("SPC-3 PR Successfully moved reservation from"
3501                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3502                 tf_ops->fabric_name, pr_reg_nacl->initiatorname,
3503                 i_buf, dest_tf_ops->fabric_name,
3504                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3505                 iport_ptr : "");
3506         /*
3507          * It is now safe to release configfs group dependencies for destination
3508          * of Transport ID Initiator Device/Port Identifier
3509          */
3510         core_scsi3_lunacl_undepend_item(dest_se_deve);
3511         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3512         core_scsi3_tpg_undepend_item(dest_se_tpg);
3513         /*
3514          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3515          * nexus on which PERSISTENT RESERVE OUT command was received.
3516          */
3517         if (unreg) {
3518                 spin_lock(&pr_tmpl->registration_lock);
3519                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3520                 spin_unlock(&pr_tmpl->registration_lock);
3521         } else
3522                 core_scsi3_put_pr_reg(pr_reg);
3523
3524         core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3525
3526         core_scsi3_put_pr_reg(dest_pr_reg);
3527         return 0;
3528 out:
3529         if (buf)
3530                 transport_kunmap_data_sg(cmd);
3531         if (dest_se_deve)
3532                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3533         if (dest_node_acl)
3534                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3535         core_scsi3_tpg_undepend_item(dest_se_tpg);
3536
3537 out_put_pr_reg:
3538         core_scsi3_put_pr_reg(pr_reg);
3539         return ret;
3540 }
3541
3542 static sense_reason_t
3543 target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key,
3544                      u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt)
3545 {
3546         struct exec_cmd_ops *ops = cmd->protocol_data;
3547
3548         if (!cmd->se_sess || !cmd->se_lun) {
3549                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3550                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3551         }
3552
3553         if (!ops->execute_pr_out) {
3554                 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
3555                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3556         }
3557
3558         switch (sa) {
3559         case PRO_REGISTER_AND_MOVE:
3560         case PRO_REPLACE_LOST_RESERVATION:
3561                 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n");
3562                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3563         }
3564
3565         if (spec_i_pt || all_tg_pt) {
3566                 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n");
3567                 return TCM_UNSUPPORTED_SCSI_OPCODE;
3568         }
3569
3570         return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl);
3571 }
3572
3573 /*
3574  * See spc4r17 section 6.14 Table 170
3575  */
3576 sense_reason_t
3577 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3578 {
3579         struct se_device *dev = cmd->se_dev;
3580         unsigned char *cdb = &cmd->t_task_cdb[0];
3581         unsigned char *buf;
3582         u64 res_key, sa_res_key;
3583         int sa, scope, type, aptpl;
3584         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3585         sense_reason_t ret;
3586
3587         /*
3588          * Following spc2r20 5.5.1 Reservations overview:
3589          *
3590          * If a logical unit has been reserved by any RESERVE command and is
3591          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3592          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3593          * initiator or service action and shall terminate with a RESERVATION
3594          * CONFLICT status.
3595          */
3596         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3597                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3598                         " SPC-2 reservation is held, returning"
3599                         " RESERVATION_CONFLICT\n");
3600                 return TCM_RESERVATION_CONFLICT;
3601         }
3602
3603         /*
3604          * FIXME: A NULL struct se_session pointer means an this is not coming from
3605          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3606          */
3607         if (!cmd->se_sess)
3608                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3609
3610         if (cmd->data_length < 24) {
3611                 pr_warn("SPC-PR: Received PR OUT parameter list"
3612                         " length too small: %u\n", cmd->data_length);
3613                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3614         }
3615
3616         /*
3617          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3618          */
3619         sa = (cdb[1] & 0x1f);
3620         scope = (cdb[2] & 0xf0);
3621         type = (cdb[2] & 0x0f);
3622
3623         buf = transport_kmap_data_sg(cmd);
3624         if (!buf)
3625                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3626
3627         /*
3628          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3629          */
3630         res_key = get_unaligned_be64(&buf[0]);
3631         sa_res_key = get_unaligned_be64(&buf[8]);
3632         /*
3633          * REGISTER_AND_MOVE uses a different SA parameter list containing
3634          * SCSI TransportIDs.
3635          */
3636         if (sa != PRO_REGISTER_AND_MOVE) {
3637                 spec_i_pt = (buf[20] & 0x08);
3638                 all_tg_pt = (buf[20] & 0x04);
3639                 aptpl = (buf[20] & 0x01);
3640         } else {
3641                 aptpl = (buf[17] & 0x01);
3642                 unreg = (buf[17] & 0x02);
3643         }
3644         /*
3645          * If the backend device has been configured to force APTPL metadata
3646          * write-out, go ahead and propigate aptpl=1 down now.
3647          */
3648         if (dev->dev_attrib.force_pr_aptpl)
3649                 aptpl = 1;
3650
3651         transport_kunmap_data_sg(cmd);
3652         buf = NULL;
3653
3654         /*
3655          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3656          */
3657         if (spec_i_pt && (sa != PRO_REGISTER))
3658                 return TCM_INVALID_PARAMETER_LIST;
3659
3660         /*
3661          * From spc4r17 section 6.14:
3662          *
3663          * If the SPEC_I_PT bit is set to zero, the service action is not
3664          * REGISTER AND MOVE, and the parameter list length is not 24, then
3665          * the command shall be terminated with CHECK CONDITION status, with
3666          * the sense key set to ILLEGAL REQUEST, and the additional sense
3667          * code set to PARAMETER LIST LENGTH ERROR.
3668          */
3669         if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
3670             (cmd->data_length != 24)) {
3671                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3672                         " list length: %u\n", cmd->data_length);
3673                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
3674         }
3675
3676         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
3677                 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type,
3678                                            aptpl, all_tg_pt, spec_i_pt);
3679                 goto done;
3680         }
3681
3682         /*
3683          * (core_scsi3_emulate_pro_* function parameters
3684          * are defined by spc4r17 Table 174:
3685          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3686          */
3687         switch (sa) {
3688         case PRO_REGISTER:
3689                 ret = core_scsi3_emulate_pro_register(cmd,
3690                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3691                 break;
3692         case PRO_RESERVE:
3693                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3694                 break;
3695         case PRO_RELEASE:
3696                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3697                 break;
3698         case PRO_CLEAR:
3699                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3700                 break;
3701         case PRO_PREEMPT:
3702                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3703                                         res_key, sa_res_key, PREEMPT);
3704                 break;
3705         case PRO_PREEMPT_AND_ABORT:
3706                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3707                                         res_key, sa_res_key, PREEMPT_AND_ABORT);
3708                 break;
3709         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3710                 ret = core_scsi3_emulate_pro_register(cmd,
3711                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3712                 break;
3713         case PRO_REGISTER_AND_MOVE:
3714                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3715                                 sa_res_key, aptpl, unreg);
3716                 break;
3717         default:
3718                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3719                         " action: 0x%02x\n", sa);
3720                 return TCM_INVALID_CDB_FIELD;
3721         }
3722
3723 done:
3724         if (!ret)
3725                 target_complete_cmd(cmd, SAM_STAT_GOOD);
3726         return ret;
3727 }
3728
3729 /*
3730  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3731  *
3732  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3733  */
3734 static sense_reason_t
3735 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3736 {
3737         struct se_device *dev = cmd->se_dev;
3738         struct t10_pr_registration *pr_reg;
3739         unsigned char *buf;
3740         u32 add_len = 0, off = 8;
3741
3742         if (cmd->data_length < 8) {
3743                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3744                         " too small\n", cmd->data_length);
3745                 return TCM_INVALID_CDB_FIELD;
3746         }
3747
3748         buf = transport_kmap_data_sg(cmd);
3749         if (!buf)
3750                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3751
3752         put_unaligned_be32(dev->t10_pr.pr_generation, buf);
3753
3754         spin_lock(&dev->t10_pr.registration_lock);
3755         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3756                         pr_reg_list) {
3757                 /*
3758                  * Check for overflow of 8byte PRI READ_KEYS payload and
3759                  * next reservation key list descriptor.
3760                  */
3761                 if (off + 8 <= cmd->data_length) {
3762                         put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3763                         off += 8;
3764                 }
3765                 /*
3766                  * SPC5r17: 6.16.2 READ KEYS service action
3767                  * The ADDITIONAL LENGTH field indicates the number of bytes in
3768                  * the Reservation key list. The contents of the ADDITIONAL
3769                  * LENGTH field are not altered based on the allocation length
3770                  */
3771                 add_len += 8;
3772         }
3773         spin_unlock(&dev->t10_pr.registration_lock);
3774
3775         put_unaligned_be32(add_len, &buf[4]);
3776         target_set_cmd_data_length(cmd, 8 + add_len);
3777
3778         transport_kunmap_data_sg(cmd);
3779
3780         return 0;
3781 }
3782
3783 /*
3784  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3785  *
3786  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3787  */
3788 static sense_reason_t
3789 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3790 {
3791         struct se_device *dev = cmd->se_dev;
3792         struct t10_pr_registration *pr_reg;
3793         unsigned char *buf;
3794         u64 pr_res_key;
3795         u32 add_len = 0;
3796
3797         if (cmd->data_length < 8) {
3798                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3799                         " too small\n", cmd->data_length);
3800                 return TCM_INVALID_CDB_FIELD;
3801         }
3802
3803         buf = transport_kmap_data_sg(cmd);
3804         if (!buf)
3805                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3806
3807         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3808
3809         spin_lock(&dev->dev_reservation_lock);
3810         pr_reg = dev->dev_pr_res_holder;
3811         if (pr_reg) {
3812                 /*
3813                  * Set the Additional Length to 16 when a reservation is held
3814                  */
3815                 add_len = 16;
3816                 put_unaligned_be32(add_len, &buf[4]);
3817
3818                 if (cmd->data_length < 22)
3819                         goto err;
3820
3821                 /*
3822                  * Set the Reservation key.
3823                  *
3824                  * From spc4r17, section 5.7.10:
3825                  * A persistent reservation holder has its reservation key
3826                  * returned in the parameter data from a PERSISTENT
3827                  * RESERVE IN command with READ RESERVATION service action as
3828                  * follows:
3829                  * a) For a persistent reservation of the type Write Exclusive
3830                  *    - All Registrants or Exclusive Access  All Regitrants,
3831                  *      the reservation key shall be set to zero; or
3832                  * b) For all other persistent reservation types, the
3833                  *    reservation key shall be set to the registered
3834                  *    reservation key for the I_T nexus that holds the
3835                  *    persistent reservation.
3836                  */
3837                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3838                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3839                         pr_res_key = 0;
3840                 else
3841                         pr_res_key = pr_reg->pr_res_key;
3842
3843                 put_unaligned_be64(pr_res_key, &buf[8]);
3844                 /*
3845                  * Set the SCOPE and TYPE
3846                  */
3847                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3848                           (pr_reg->pr_res_type & 0x0f);
3849         }
3850
3851         target_set_cmd_data_length(cmd, 8 + add_len);
3852
3853 err:
3854         spin_unlock(&dev->dev_reservation_lock);
3855         transport_kunmap_data_sg(cmd);
3856
3857         return 0;
3858 }
3859
3860 /*
3861  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3862  *
3863  * See spc4r17 section 6.13.4 Table 165
3864  */
3865 static sense_reason_t
3866 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3867 {
3868         struct se_device *dev = cmd->se_dev;
3869         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3870         unsigned char *buf;
3871         u16 len = 8; /* Hardcoded to 8. */
3872
3873         if (cmd->data_length < 6) {
3874                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3875                         " %u too small\n", cmd->data_length);
3876                 return TCM_INVALID_CDB_FIELD;
3877         }
3878
3879         buf = transport_kmap_data_sg(cmd);
3880         if (!buf)
3881                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3882
3883         put_unaligned_be16(len, &buf[0]);
3884         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3885         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3886         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3887         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3888         /*
3889          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3890          * set the TMV: Task Mask Valid bit.
3891          */
3892         buf[3] |= 0x80;
3893         /*
3894          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3895          */
3896         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3897         /*
3898          * PTPL_A: Persistence across Target Power Loss Active bit
3899          */
3900         if (pr_tmpl->pr_aptpl_active)
3901                 buf[3] |= 0x01;
3902         /*
3903          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3904          */
3905         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3906         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3907         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3908         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3909         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3910         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3911
3912         target_set_cmd_data_length(cmd, len);
3913
3914         transport_kunmap_data_sg(cmd);
3915
3916         return 0;
3917 }
3918
3919 /*
3920  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3921  *
3922  * See spc4r17 section 6.13.5 Table 168 and 169
3923  */
3924 static sense_reason_t
3925 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3926 {
3927         struct se_device *dev = cmd->se_dev;
3928         struct se_node_acl *se_nacl;
3929         struct se_portal_group *se_tpg;
3930         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3931         struct t10_reservation *pr_tmpl = &dev->t10_pr;
3932         unsigned char *buf;
3933         u32 add_desc_len = 0, add_len = 0;
3934         u32 off = 8; /* off into first Full Status descriptor */
3935         int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
3936         int exp_desc_len, desc_len;
3937         bool all_reg = false;
3938
3939         if (cmd->data_length < 8) {
3940                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3941                         " too small\n", cmd->data_length);
3942                 return TCM_INVALID_CDB_FIELD;
3943         }
3944
3945         buf = transport_kmap_data_sg(cmd);
3946         if (!buf)
3947                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3948
3949         put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
3950
3951         spin_lock(&dev->dev_reservation_lock);
3952         if (dev->dev_pr_res_holder) {
3953                 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
3954
3955                 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
3956                     pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
3957                         all_reg = true;
3958                         pr_res_type = pr_holder->pr_res_type;
3959                         pr_res_scope = pr_holder->pr_res_scope;
3960                 }
3961         }
3962         spin_unlock(&dev->dev_reservation_lock);
3963
3964         spin_lock(&pr_tmpl->registration_lock);
3965         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3966                         &pr_tmpl->registration_list, pr_reg_list) {
3967
3968                 se_nacl = pr_reg->pr_reg_nacl;
3969                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3970                 add_desc_len = 0;
3971
3972                 atomic_inc_mb(&pr_reg->pr_res_holders);
3973                 spin_unlock(&pr_tmpl->registration_lock);
3974                 /*
3975                  * Determine expected length of $FABRIC_MOD specific
3976                  * TransportID full status descriptor..
3977                  */
3978                 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
3979                                         &format_code);
3980                 if (exp_desc_len < 0 ||
3981                     exp_desc_len + add_len > cmd->data_length) {
3982                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3983                                 " out of buffer: %d\n", cmd->data_length);
3984                         spin_lock(&pr_tmpl->registration_lock);
3985                         atomic_dec_mb(&pr_reg->pr_res_holders);
3986                         break;
3987                 }
3988                 /*
3989                  * Set RESERVATION KEY
3990                  */
3991                 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
3992                 off += 8;
3993                 off += 4; /* Skip Over Reserved area */
3994
3995                 /*
3996                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3997                  */
3998                 if (pr_reg->pr_reg_all_tg_pt)
3999                         buf[off] = 0x02;
4000                 /*
4001                  * The struct se_lun pointer will be present for the
4002                  * reservation holder for PR_HOLDER bit.
4003                  *
4004                  * Also, if this registration is the reservation
4005                  * holder or there is an All Registrants reservation
4006                  * active, fill in SCOPE and TYPE in the next byte.
4007                  */
4008                 if (pr_reg->pr_res_holder) {
4009                         buf[off++] |= 0x01;
4010                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4011                                      (pr_reg->pr_res_type & 0x0f);
4012                 } else if (all_reg) {
4013                         buf[off++] |= 0x01;
4014                         buf[off++] = (pr_res_scope & 0xf0) |
4015                                      (pr_res_type & 0x0f);
4016                 } else {
4017                         off += 2;
4018                 }
4019
4020                 off += 4; /* Skip over reserved area */
4021                 /*
4022                  * From spc4r17 6.3.15:
4023                  *
4024                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4025                  * IDENTIFIER field contains the relative port identifier (see
4026                  * 3.1.120) of the target port that is part of the I_T nexus
4027                  * described by this full status descriptor. If the ALL_TG_PT
4028                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4029                  * IDENTIFIER field are not defined by this standard.
4030                  */
4031                 if (!pr_reg->pr_reg_all_tg_pt) {
4032                         u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
4033
4034                         put_unaligned_be16(sep_rtpi, &buf[off]);
4035                         off += 2;
4036                 } else
4037                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4038
4039                 buf[off+4] = se_tpg->proto_id;
4040
4041                 /*
4042                  * Now, have the $FABRIC_MOD fill in the transport ID.
4043                  */
4044                 desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
4045                                 &format_code, &buf[off+4]);
4046
4047                 spin_lock(&pr_tmpl->registration_lock);
4048                 atomic_dec_mb(&pr_reg->pr_res_holders);
4049
4050                 if (desc_len < 0)
4051                         break;
4052                 /*
4053                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4054                  */
4055                 put_unaligned_be32(desc_len, &buf[off]);
4056                 off += 4;
4057                 /*
4058                  * Size of full desctipor header minus TransportID
4059                  * containing $FABRIC_MOD specific) initiator device/port
4060                  * WWN information.
4061                  *
4062                  *  See spc4r17 Section 6.13.5 Table 169
4063                  */
4064                 add_desc_len = (24 + desc_len);
4065
4066                 off += desc_len;
4067                 add_len += add_desc_len;
4068         }
4069         spin_unlock(&pr_tmpl->registration_lock);
4070         /*
4071          * Set ADDITIONAL_LENGTH
4072          */
4073         put_unaligned_be32(add_len, &buf[4]);
4074         target_set_cmd_data_length(cmd, 8 + add_len);
4075
4076         transport_kunmap_data_sg(cmd);
4077
4078         return 0;
4079 }
4080
4081 static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa)
4082 {
4083         struct exec_cmd_ops *ops = cmd->protocol_data;
4084         unsigned char *buf;
4085         sense_reason_t ret;
4086
4087         if (cmd->data_length < 8) {
4088                 pr_err("PRIN SA SCSI Data Length: %u too small\n",
4089                        cmd->data_length);
4090                 return TCM_INVALID_CDB_FIELD;
4091         }
4092
4093         if (!ops->execute_pr_in) {
4094                 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
4095                 return TCM_UNSUPPORTED_SCSI_OPCODE;
4096         }
4097
4098         if (sa == PRI_READ_FULL_STATUS) {
4099                 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n");
4100                 return TCM_UNSUPPORTED_SCSI_OPCODE;
4101         }
4102
4103         buf = transport_kmap_data_sg(cmd);
4104         if (!buf)
4105                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4106
4107         ret = ops->execute_pr_in(cmd, sa, buf);
4108
4109         transport_kunmap_data_sg(cmd);
4110         return ret;
4111 }
4112
4113 sense_reason_t
4114 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
4115 {
4116         u8 sa = cmd->t_task_cdb[1] & 0x1f;
4117         sense_reason_t ret;
4118
4119         /*
4120          * Following spc2r20 5.5.1 Reservations overview:
4121          *
4122          * If a logical unit has been reserved by any RESERVE command and is
4123          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4124          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4125          * initiator or service action and shall terminate with a RESERVATION
4126          * CONFLICT status.
4127          */
4128         if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
4129                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4130                         " SPC-2 reservation is held, returning"
4131                         " RESERVATION_CONFLICT\n");
4132                 return TCM_RESERVATION_CONFLICT;
4133         }
4134
4135         if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
4136                 ret = target_try_pr_in_pt(cmd, sa);
4137                 goto done;
4138         }
4139
4140         switch (sa) {
4141         case PRI_READ_KEYS:
4142                 ret = core_scsi3_pri_read_keys(cmd);
4143                 break;
4144         case PRI_READ_RESERVATION:
4145                 ret = core_scsi3_pri_read_reservation(cmd);
4146                 break;
4147         case PRI_REPORT_CAPABILITIES:
4148                 ret = core_scsi3_pri_report_capabilities(cmd);
4149                 break;
4150         case PRI_READ_FULL_STATUS:
4151                 ret = core_scsi3_pri_read_full_status(cmd);
4152                 break;
4153         default:
4154                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4155                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4156                 return TCM_INVALID_CDB_FIELD;
4157         }
4158
4159 done:
4160         if (!ret)
4161                 target_complete_cmd(cmd, SAM_STAT_GOOD);
4162         return ret;
4163 }
4164
4165 sense_reason_t
4166 target_check_reservation(struct se_cmd *cmd)
4167 {
4168         struct se_device *dev = cmd->se_dev;
4169         sense_reason_t ret;
4170
4171         if (!cmd->se_sess)
4172                 return 0;
4173         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4174                 return 0;
4175         if (!dev->dev_attrib.emulate_pr)
4176                 return 0;
4177         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
4178                 return 0;
4179
4180         spin_lock(&dev->dev_reservation_lock);
4181         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4182                 ret = target_scsi2_reservation_check(cmd);
4183         else
4184                 ret = target_scsi3_pr_reservation_check(cmd);
4185         spin_unlock(&dev->dev_reservation_lock);
4186
4187         return ret;
4188 }