Pileus Git - ~andy/linux/blob - drivers/target/target_core_pr.c

   1 /*******************************************************************************
   2  * Filename:  target_core_pr.c
   3  *
   4  * This file contains SPC-3 compliant persistent reservations and
   5  * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
   6  *
   7  * Copyright (c) 2009, 2010 Rising Tide Systems
   8  * Copyright (c) 2009, 2010 Linux-iSCSI.org
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  *
  26  ******************************************************************************/
  27
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/list.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_device.h>
  37 #include <target/target_core_tmr.h>
  38 #include <target/target_core_tpg.h>
  39 #include <target/target_core_transport.h>
  40 #include <target/target_core_fabric_ops.h>
  41 #include <target/target_core_configfs.h>
  42
  43 #include "target_core_hba.h"
  44 #include "target_core_pr.h"
  45 #include "target_core_ua.h"
  46
  47 /*
  48  * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
  49  */
  50 struct pr_transport_id_holder {
  51         int dest_local_nexus;
  52         struct t10_pr_registration *dest_pr_reg;
  53         struct se_portal_group *dest_tpg;
  54         struct se_node_acl *dest_node_acl;
  55         struct se_dev_entry *dest_se_deve;
  56         struct list_head dest_list;
  57 };
  58
  59 int core_pr_dump_initiator_port(
  60         struct t10_pr_registration *pr_reg,
  61         char *buf,
  62         u32 size)
  63 {
  64         if (!pr_reg->isid_present_at_reg)
  65                 return 0;
  66
  67         snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
  68         return 1;
  69 }
  70
  71 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
  72                         struct t10_pr_registration *, int);
  73
  74 static int core_scsi2_reservation_seq_non_holder(
  75         struct se_cmd *cmd,
  76         unsigned char *cdb,
  77         u32 pr_reg_type)
  78 {
  79         switch (cdb[0]) {
  80         case INQUIRY:
  81         case RELEASE:
  82         case RELEASE_10:
  83                 return 0;
  84         default:
  85                 return 1;
  86         }
  87
  88         return 1;
  89 }
  90
  91 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
  92 {
  93         struct se_device *dev = cmd->se_dev;
  94         struct se_session *sess = cmd->se_sess;
  95         int ret;
  96
  97         if (!sess)
  98                 return 0;
  99
 100         spin_lock(&dev->dev_reservation_lock);
 101         if (!dev->dev_reserved_node_acl || !sess) {
 102                 spin_unlock(&dev->dev_reservation_lock);
 103                 return 0;
 104         }
 105         if (dev->dev_reserved_node_acl != sess->se_node_acl) {
 106                 spin_unlock(&dev->dev_reservation_lock);
 107                 return -EINVAL;
 108         }
 109         if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
 110                 spin_unlock(&dev->dev_reservation_lock);
 111                 return 0;
 112         }
 113         ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
 114         spin_unlock(&dev->dev_reservation_lock);
 115
 116         return ret;
 117 }
 118
 119 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
 120                                         struct se_node_acl *, struct se_session *);
 121 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
 122
 123 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
 124 {
 125         struct se_session *se_sess = cmd->se_sess;
 126         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 127         struct t10_pr_registration *pr_reg;
 128         struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
 129         int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
 130         int conflict = 0;
 131
 132         if (!crh)
 133                 return false;
 134
 135         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
 136                         se_sess);
 137         if (pr_reg) {
 138                 /*
 139                  * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
 140                  * behavior
 141                  *
 142                  * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
 143                  * status, but no reservation shall be established and the
 144                  * persistent reservation shall not be changed, if the command
 145                  * is received from a) and b) below.
 146                  *
 147                  * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
 148                  * status, but the persistent reservation shall not be released,
 149                  * if the command is received from a) and b)
 150                  *
 151                  * a) An I_T nexus that is a persistent reservation holder; or
 152                  * b) An I_T nexus that is registered if a registrants only or
 153                  *    all registrants type persistent reservation is present.
 154                  *
 155                  * In all other cases, a RESERVE(6) command, RESERVE(10) command,
 156                  * RELEASE(6) command, or RELEASE(10) command shall be processed
 157                  * as defined in SPC-2.
 158                  */
 159                 if (pr_reg->pr_res_holder) {
 160                         core_scsi3_put_pr_reg(pr_reg);
 161                         *ret = 0;
 162                         return false;
 163                 }
 164                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
 165                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
 166                     (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
 167                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
 168                         core_scsi3_put_pr_reg(pr_reg);
 169                         *ret = 0;
 170                         return true;
 171                 }
 172                 core_scsi3_put_pr_reg(pr_reg);
 173                 conflict = 1;
 174         } else {
 175                 /*
 176                  * Following spc2r20 5.5.1 Reservations overview:
 177                  *
 178                  * If a logical unit has executed a PERSISTENT RESERVE OUT
 179                  * command with the REGISTER or the REGISTER AND IGNORE
 180                  * EXISTING KEY service action and is still registered by any
 181                  * initiator, all RESERVE commands and all RELEASE commands
 182                  * regardless of initiator shall conflict and shall terminate
 183                  * with a RESERVATION CONFLICT status.
 184                  */
 185                 spin_lock(&pr_tmpl->registration_lock);
 186                 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
 187                 spin_unlock(&pr_tmpl->registration_lock);
 188         }
 189
 190         if (conflict) {
 191                 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
 192                         " while active SPC-3 registrations exist,"
 193                         " returning RESERVATION_CONFLICT\n");
 194                 *ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
 195                 return true;
 196         }
 197
 198         return false;
 199 }
 200
 201 int target_scsi2_reservation_release(struct se_task *task)
 202 {
 203         struct se_cmd *cmd = task->task_se_cmd;
 204         struct se_device *dev = cmd->se_dev;
 205         struct se_session *sess = cmd->se_sess;
 206         struct se_portal_group *tpg = sess->se_tpg;
 207         int ret = 0;
 208
 209         if (!sess || !tpg)
 210                 goto out;
 211         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 212                 goto out;
 213
 214         ret = 0;
 215         spin_lock(&dev->dev_reservation_lock);
 216         if (!dev->dev_reserved_node_acl || !sess)
 217                 goto out_unlock;
 218
 219         if (dev->dev_reserved_node_acl != sess->se_node_acl)
 220                 goto out_unlock;
 221
 222         dev->dev_reserved_node_acl = NULL;
 223         dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 224         if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
 225                 dev->dev_res_bin_isid = 0;
 226                 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
 227         }
 228         pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
 229                 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 230                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 231                 sess->se_node_acl->initiatorname);
 232
 233 out_unlock:
 234         spin_unlock(&dev->dev_reservation_lock);
 235 out:
 236         if (!ret) {
 237                 task->task_scsi_status = GOOD;
 238                 transport_complete_task(task, 1);
 239         }
 240         return ret;
 241 }
 242
 243 int target_scsi2_reservation_reserve(struct se_task *task)
 244 {
 245         struct se_cmd *cmd = task->task_se_cmd;
 246         struct se_device *dev = cmd->se_dev;
 247         struct se_session *sess = cmd->se_sess;
 248         struct se_portal_group *tpg = sess->se_tpg;
 249         int ret = 0;
 250
 251         if ((cmd->t_task_cdb[1] & 0x01) &&
 252             (cmd->t_task_cdb[1] & 0x02)) {
 253                 pr_err("LongIO and Obselete Bits set, returning"
 254                                 " ILLEGAL_REQUEST\n");
 255                 ret = PYX_TRANSPORT_ILLEGAL_REQUEST;
 256                 goto out;
 257         }
 258         /*
 259          * This is currently the case for target_core_mod passthrough struct se_cmd
 260          * ops
 261          */
 262         if (!sess || !tpg)
 263                 goto out;
 264         if (target_check_scsi2_reservation_conflict(cmd, &ret))
 265                 goto out;
 266
 267         ret = 0;
 268         spin_lock(&dev->dev_reservation_lock);
 269         if (dev->dev_reserved_node_acl &&
 270            (dev->dev_reserved_node_acl != sess->se_node_acl)) {
 271                 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
 272                         tpg->se_tpg_tfo->get_fabric_name());
 273                 pr_err("Original reserver LUN: %u %s\n",
 274                         cmd->se_lun->unpacked_lun,
 275                         dev->dev_reserved_node_acl->initiatorname);
 276                 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
 277                         " from %s \n", cmd->se_lun->unpacked_lun,
 278                         cmd->se_deve->mapped_lun,
 279                         sess->se_node_acl->initiatorname);
 280                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
 281                 goto out_unlock;
 282         }
 283
 284         dev->dev_reserved_node_acl = sess->se_node_acl;
 285         dev->dev_flags |= DF_SPC2_RESERVATIONS;
 286         if (sess->sess_bin_isid != 0) {
 287                 dev->dev_res_bin_isid = sess->sess_bin_isid;
 288                 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
 289         }
 290         pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
 291                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 292                 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
 293                 sess->se_node_acl->initiatorname);
 294
 295 out_unlock:
 296         spin_unlock(&dev->dev_reservation_lock);
 297 out:
 298         if (!ret) {
 299                 task->task_scsi_status = GOOD;
 300                 transport_complete_task(task, 1);
 301         }
 302         return ret;
 303 }
 304
 305
 306 /*
 307  * Begin SPC-3/SPC-4 Persistent Reservations emulation support
 308  *
 309  * This function is called by those initiator ports who are *NOT*
 310  * the active PR reservation holder when a reservation is present.
 311  */
 312 static int core_scsi3_pr_seq_non_holder(
 313         struct se_cmd *cmd,
 314         unsigned char *cdb,
 315         u32 pr_reg_type)
 316 {
 317         struct se_dev_entry *se_deve;
 318         struct se_session *se_sess = cmd->se_sess;
 319         int other_cdb = 0, ignore_reg;
 320         int registered_nexus = 0, ret = 1; /* Conflict by default */
 321         int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
 322         int we = 0; /* Write Exclusive */
 323         int legacy = 0; /* Act like a legacy device and return
 324                          * RESERVATION CONFLICT on some CDBs */
 325         /*
 326          * A legacy SPC-2 reservation is being held.
 327          */
 328         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
 329                 return core_scsi2_reservation_seq_non_holder(cmd,
 330                                         cdb, pr_reg_type);
 331
 332         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
 333         /*
 334          * Determine if the registration should be ignored due to
 335          * non-matching ISIDs in core_scsi3_pr_reservation_check().
 336          */
 337         ignore_reg = (pr_reg_type & 0x80000000);
 338         if (ignore_reg)
 339                 pr_reg_type &= ~0x80000000;
 340
 341         switch (pr_reg_type) {
 342         case PR_TYPE_WRITE_EXCLUSIVE:
 343                 we = 1;
 344         case PR_TYPE_EXCLUSIVE_ACCESS:
 345                 /*
 346                  * Some commands are only allowed for the persistent reservation
 347                  * holder.
 348                  */
 349                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 350                         registered_nexus = 1;
 351                 break;
 352         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
 353                 we = 1;
 354         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
 355                 /*
 356                  * Some commands are only allowed for registered I_T Nexuses.
 357                  */
 358                 reg_only = 1;
 359                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 360                         registered_nexus = 1;
 361                 break;
 362         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
 363                 we = 1;
 364         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
 365                 /*
 366                  * Each registered I_T Nexus is a reservation holder.
 367                  */
 368                 all_reg = 1;
 369                 if ((se_deve->def_pr_registered) && !(ignore_reg))
 370                         registered_nexus = 1;
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375         /*
 376          * Referenced from spc4r17 table 45 for *NON* PR holder access
 377          */
 378         switch (cdb[0]) {
 379         case SECURITY_PROTOCOL_IN:
 380                 if (registered_nexus)
 381                         return 0;
 382                 ret = (we) ? 0 : 1;
 383                 break;
 384         case MODE_SENSE:
 385         case MODE_SENSE_10:
 386         case READ_ATTRIBUTE:
 387         case READ_BUFFER:
 388         case RECEIVE_DIAGNOSTIC:
 389                 if (legacy) {
 390                         ret = 1;
 391                         break;
 392                 }
 393                 if (registered_nexus) {
 394                         ret = 0;
 395                         break;
 396                 }
 397                 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 398                 break;
 399         case PERSISTENT_RESERVE_OUT:
 400                 /*
 401                  * This follows PERSISTENT_RESERVE_OUT service actions that
 402                  * are allowed in the presence of various reservations.
 403                  * See spc4r17, table 46
 404                  */
 405                 switch (cdb[1] & 0x1f) {
 406                 case PRO_CLEAR:
 407                 case PRO_PREEMPT:
 408                 case PRO_PREEMPT_AND_ABORT:
 409                         ret = (registered_nexus) ? 0 : 1;
 410                         break;
 411                 case PRO_REGISTER:
 412                 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
 413                         ret = 0;
 414                         break;
 415                 case PRO_REGISTER_AND_MOVE:
 416                 case PRO_RESERVE:
 417                         ret = 1;
 418                         break;
 419                 case PRO_RELEASE:
 420                         ret = (registered_nexus) ? 0 : 1;
 421                         break;
 422                 default:
 423                         pr_err("Unknown PERSISTENT_RESERVE_OUT service"
 424                                 " action: 0x%02x\n", cdb[1] & 0x1f);
 425                         return -EINVAL;
 426                 }
 427                 break;
 428         case RELEASE:
 429         case RELEASE_10:
 430                 /* Handled by CRH=1 in target_scsi2_reservation_release() */
 431                 ret = 0;
 432                 break;
 433         case RESERVE:
 434         case RESERVE_10:
 435                 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
 436                 ret = 0;
 437                 break;
 438         case TEST_UNIT_READY:
 439                 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
 440                 break;
 441         case MAINTENANCE_IN:
 442                 switch (cdb[1] & 0x1f) {
 443                 case MI_MANAGEMENT_PROTOCOL_IN:
 444                         if (registered_nexus) {
 445                                 ret = 0;
 446                                 break;
 447                         }
 448                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 449                         break;
 450                 case MI_REPORT_SUPPORTED_OPERATION_CODES:
 451                 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
 452                         if (legacy) {
 453                                 ret = 1;
 454                                 break;
 455                         }
 456                         if (registered_nexus) {
 457                                 ret = 0;
 458                                 break;
 459                         }
 460                         ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
 461                         break;
 462                 case MI_REPORT_ALIASES:
 463                 case MI_REPORT_IDENTIFYING_INFORMATION:
 464                 case MI_REPORT_PRIORITY:
 465                 case MI_REPORT_TARGET_PGS:
 466                 case MI_REPORT_TIMESTAMP:
 467                         ret = 0; /* Allowed */
 468                         break;
 469                 default:
 470                         pr_err("Unknown MI Service Action: 0x%02x\n",
 471                                 (cdb[1] & 0x1f));
 472                         return -EINVAL;
 473                 }
 474                 break;
 475         case ACCESS_CONTROL_IN:
 476         case ACCESS_CONTROL_OUT:
 477         case INQUIRY:
 478         case LOG_SENSE:
 479         case READ_MEDIA_SERIAL_NUMBER:
 480         case REPORT_LUNS:
 481         case REQUEST_SENSE:
 482                 ret = 0; /*/ Allowed CDBs */
 483                 break;
 484         default:
 485                 other_cdb = 1;
 486                 break;
 487         }
 488         /*
 489          * Case where the CDB is explicitly allowed in the above switch
 490          * statement.
 491          */
 492         if (!ret && !other_cdb) {
 493 #if 0
 494                 pr_debug("Allowing explict CDB: 0x%02x for %s"
 495                         " reservation holder\n", cdb[0],
 496                         core_scsi3_pr_dump_type(pr_reg_type));
 497 #endif
 498                 return ret;
 499         }
 500         /*
 501          * Check if write exclusive initiator ports *NOT* holding the
 502          * WRITE_EXCLUSIVE_* reservation.
 503          */
 504         if ((we) && !(registered_nexus)) {
 505                 if (cmd->data_direction == DMA_TO_DEVICE) {
 506                         /*
 507                          * Conflict for write exclusive
 508                          */
 509                         pr_debug("%s Conflict for unregistered nexus"
 510                                 " %s CDB: 0x%02x to %s reservation\n",
 511                                 transport_dump_cmd_direction(cmd),
 512                                 se_sess->se_node_acl->initiatorname, cdb[0],
 513                                 core_scsi3_pr_dump_type(pr_reg_type));
 514                         return 1;
 515                 } else {
 516                         /*
 517                          * Allow non WRITE CDBs for all Write Exclusive
 518                          * PR TYPEs to pass for registered and
 519                          * non-registered_nexuxes NOT holding the reservation.
 520                          *
 521                          * We only make noise for the unregisterd nexuses,
 522                          * as we expect registered non-reservation holding
 523                          * nexuses to issue CDBs.
 524                          */
 525 #if 0
 526                         if (!registered_nexus) {
 527                                 pr_debug("Allowing implict CDB: 0x%02x"
 528                                         " for %s reservation on unregistered"
 529                                         " nexus\n", cdb[0],
 530                                         core_scsi3_pr_dump_type(pr_reg_type));
 531                         }
 532 #endif
 533                         return 0;
 534                 }
 535         } else if ((reg_only) || (all_reg)) {
 536                 if (registered_nexus) {
 537                         /*
 538                          * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
 539                          * allow commands from registered nexuses.
 540                          */
 541 #if 0
 542                         pr_debug("Allowing implict CDB: 0x%02x for %s"
 543                                 " reservation\n", cdb[0],
 544                                 core_scsi3_pr_dump_type(pr_reg_type));
 545 #endif
 546                         return 0;
 547                 }
 548         }
 549         pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
 550                 " for %s reservation\n", transport_dump_cmd_direction(cmd),
 551                 (registered_nexus) ? "" : "un",
 552                 se_sess->se_node_acl->initiatorname, cdb[0],
 553                 core_scsi3_pr_dump_type(pr_reg_type));
 554
 555         return 1; /* Conflict by default */
 556 }
 557
 558 static u32 core_scsi3_pr_generation(struct se_device *dev)
 559 {
 560         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 561         u32 prg;
 562         /*
 563          * PRGeneration field shall contain the value of a 32-bit wrapping
 564          * counter mainted by the device server.
 565          *
 566          * Note that this is done regardless of Active Persist across
 567          * Target PowerLoss (APTPL)
 568          *
 569          * See spc4r17 section 6.3.12 READ_KEYS service action
 570          */
 571         spin_lock(&dev->dev_reservation_lock);
 572         prg = su_dev->t10_pr.pr_generation++;
 573         spin_unlock(&dev->dev_reservation_lock);
 574
 575         return prg;
 576 }
 577
 578 static int core_scsi3_pr_reservation_check(
 579         struct se_cmd *cmd,
 580         u32 *pr_reg_type)
 581 {
 582         struct se_device *dev = cmd->se_dev;
 583         struct se_session *sess = cmd->se_sess;
 584         int ret;
 585
 586         if (!sess)
 587                 return 0;
 588         /*
 589          * A legacy SPC-2 reservation is being held.
 590          */
 591         if (dev->dev_flags & DF_SPC2_RESERVATIONS)
 592                 return core_scsi2_reservation_check(cmd, pr_reg_type);
 593
 594         spin_lock(&dev->dev_reservation_lock);
 595         if (!dev->dev_pr_res_holder) {
 596                 spin_unlock(&dev->dev_reservation_lock);
 597                 return 0;
 598         }
 599         *pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
 600         cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
 601         if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
 602                 spin_unlock(&dev->dev_reservation_lock);
 603                 return -EINVAL;
 604         }
 605         if (!dev->dev_pr_res_holder->isid_present_at_reg) {
 606                 spin_unlock(&dev->dev_reservation_lock);
 607                 return 0;
 608         }
 609         ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
 610                sess->sess_bin_isid) ? 0 : -EINVAL;
 611         /*
 612          * Use bit in *pr_reg_type to notify ISID mismatch in
 613          * core_scsi3_pr_seq_non_holder().
 614          */
 615         if (ret != 0)
 616                 *pr_reg_type |= 0x80000000;
 617         spin_unlock(&dev->dev_reservation_lock);
 618
 619         return ret;
 620 }
 621
 622 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 623         struct se_device *dev,
 624         struct se_node_acl *nacl,
 625         struct se_dev_entry *deve,
 626         unsigned char *isid,
 627         u64 sa_res_key,
 628         int all_tg_pt,
 629         int aptpl)
 630 {
 631         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 632         struct t10_pr_registration *pr_reg;
 633
 634         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
 635         if (!pr_reg) {
 636                 pr_err("Unable to allocate struct t10_pr_registration\n");
 637                 return NULL;
 638         }
 639
 640         pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
 641                                         GFP_ATOMIC);
 642         if (!pr_reg->pr_aptpl_buf) {
 643                 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 644                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
 645                 return NULL;
 646         }
 647
 648         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 649         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 650         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 651         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 652         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 653         atomic_set(&pr_reg->pr_res_holders, 0);
 654         pr_reg->pr_reg_nacl = nacl;
 655         pr_reg->pr_reg_deve = deve;
 656         pr_reg->pr_res_mapped_lun = deve->mapped_lun;
 657         pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
 658         pr_reg->pr_res_key = sa_res_key;
 659         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 660         pr_reg->pr_reg_aptpl = aptpl;
 661         pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
 662         /*
 663          * If an ISID value for this SCSI Initiator Port exists,
 664          * save it to the registration now.
 665          */
 666         if (isid != NULL) {
 667                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 668                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 669                 pr_reg->isid_present_at_reg = 1;
 670         }
 671
 672         return pr_reg;
 673 }
 674
 675 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
 676 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
 677
 678 /*
 679  * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
 680  * modes.
 681  */
 682 static struct t10_pr_registration *__core_scsi3_alloc_registration(
 683         struct se_device *dev,
 684         struct se_node_acl *nacl,
 685         struct se_dev_entry *deve,
 686         unsigned char *isid,
 687         u64 sa_res_key,
 688         int all_tg_pt,
 689         int aptpl)
 690 {
 691         struct se_dev_entry *deve_tmp;
 692         struct se_node_acl *nacl_tmp;
 693         struct se_port *port, *port_tmp;
 694         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
 695         struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
 696         int ret;
 697         /*
 698          * Create a registration for the I_T Nexus upon which the
 699          * PROUT REGISTER was received.
 700          */
 701         pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
 702                         sa_res_key, all_tg_pt, aptpl);
 703         if (!pr_reg)
 704                 return NULL;
 705         /*
 706          * Return pointer to pr_reg for ALL_TG_PT=0
 707          */
 708         if (!all_tg_pt)
 709                 return pr_reg;
 710         /*
 711          * Create list of matching SCSI Initiator Port registrations
 712          * for ALL_TG_PT=1
 713          */
 714         spin_lock(&dev->se_port_lock);
 715         list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
 716                 atomic_inc(&port->sep_tg_pt_ref_cnt);
 717                 smp_mb__after_atomic_inc();
 718                 spin_unlock(&dev->se_port_lock);
 719
 720                 spin_lock_bh(&port->sep_alua_lock);
 721                 list_for_each_entry(deve_tmp, &port->sep_alua_list,
 722                                         alua_port_list) {
 723                         /*
 724                          * This pointer will be NULL for demo mode MappedLUNs
 725                          * that have not been make explict via a ConfigFS
 726                          * MappedLUN group for the SCSI Initiator Node ACL.
 727                          */
 728                         if (!deve_tmp->se_lun_acl)
 729                                 continue;
 730
 731                         nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
 732                         /*
 733                          * Skip the matching struct se_node_acl that is allocated
 734                          * above..
 735                          */
 736                         if (nacl == nacl_tmp)
 737                                 continue;
 738                         /*
 739                          * Only perform PR registrations for target ports on
 740                          * the same fabric module as the REGISTER w/ ALL_TG_PT=1
 741                          * arrived.
 742                          */
 743                         if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
 744                                 continue;
 745                         /*
 746                          * Look for a matching Initiator Node ACL in ASCII format
 747                          */
 748                         if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
 749                                 continue;
 750
 751                         atomic_inc(&deve_tmp->pr_ref_count);
 752                         smp_mb__after_atomic_inc();
 753                         spin_unlock_bh(&port->sep_alua_lock);
 754                         /*
 755                          * Grab a configfs group dependency that is released
 756                          * for the exception path at label out: below, or upon
 757                          * completion of adding ALL_TG_PT=1 registrations in
 758                          * __core_scsi3_add_registration()
 759                          */
 760                         ret = core_scsi3_lunacl_depend_item(deve_tmp);
 761                         if (ret < 0) {
 762                                 pr_err("core_scsi3_lunacl_depend"
 763                                                 "_item() failed\n");
 764                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 765                                 smp_mb__after_atomic_dec();
 766                                 atomic_dec(&deve_tmp->pr_ref_count);
 767                                 smp_mb__after_atomic_dec();
 768                                 goto out;
 769                         }
 770                         /*
 771                          * Located a matching SCSI Initiator Port on a different
 772                          * port, allocate the pr_reg_atp and attach it to the
 773                          * pr_reg->pr_reg_atp_list that will be processed once
 774                          * the original *pr_reg is processed in
 775                          * __core_scsi3_add_registration()
 776                          */
 777                         pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
 778                                                 nacl_tmp, deve_tmp, NULL,
 779                                                 sa_res_key, all_tg_pt, aptpl);
 780                         if (!pr_reg_atp) {
 781                                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 782                                 smp_mb__after_atomic_dec();
 783                                 atomic_dec(&deve_tmp->pr_ref_count);
 784                                 smp_mb__after_atomic_dec();
 785                                 core_scsi3_lunacl_undepend_item(deve_tmp);
 786                                 goto out;
 787                         }
 788
 789                         list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 790                                       &pr_reg->pr_reg_atp_list);
 791                         spin_lock_bh(&port->sep_alua_lock);
 792                 }
 793                 spin_unlock_bh(&port->sep_alua_lock);
 794
 795                 spin_lock(&dev->se_port_lock);
 796                 atomic_dec(&port->sep_tg_pt_ref_cnt);
 797                 smp_mb__after_atomic_dec();
 798         }
 799         spin_unlock(&dev->se_port_lock);
 800
 801         return pr_reg;
 802 out:
 803         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
 804                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
 805                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
 806                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
 807                 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
 808         }
 809         kmem_cache_free(t10_pr_reg_cache, pr_reg);
 810         return NULL;
 811 }
 812
 813 int core_scsi3_alloc_aptpl_registration(
 814         struct t10_reservation *pr_tmpl,
 815         u64 sa_res_key,
 816         unsigned char *i_port,
 817         unsigned char *isid,
 818         u32 mapped_lun,
 819         unsigned char *t_port,
 820         u16 tpgt,
 821         u32 target_lun,
 822         int res_holder,
 823         int all_tg_pt,
 824         u8 type)
 825 {
 826         struct t10_pr_registration *pr_reg;
 827
 828         if (!i_port || !t_port || !sa_res_key) {
 829                 pr_err("Illegal parameters for APTPL registration\n");
 830                 return -EINVAL;
 831         }
 832
 833         pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
 834         if (!pr_reg) {
 835                 pr_err("Unable to allocate struct t10_pr_registration\n");
 836                 return -ENOMEM;
 837         }
 838         pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
 839
 840         INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 841         INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
 842         INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
 843         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
 844         INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
 845         atomic_set(&pr_reg->pr_res_holders, 0);
 846         pr_reg->pr_reg_nacl = NULL;
 847         pr_reg->pr_reg_deve = NULL;
 848         pr_reg->pr_res_mapped_lun = mapped_lun;
 849         pr_reg->pr_aptpl_target_lun = target_lun;
 850         pr_reg->pr_res_key = sa_res_key;
 851         pr_reg->pr_reg_all_tg_pt = all_tg_pt;
 852         pr_reg->pr_reg_aptpl = 1;
 853         pr_reg->pr_reg_tg_pt_lun = NULL;
 854         pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
 855         pr_reg->pr_res_type = type;
 856         /*
 857          * If an ISID value had been saved in APTPL metadata for this
 858          * SCSI Initiator Port, restore it now.
 859          */
 860         if (isid != NULL) {
 861                 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
 862                 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
 863                 pr_reg->isid_present_at_reg = 1;
 864         }
 865         /*
 866          * Copy the i_port and t_port information from caller.
 867          */
 868         snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
 869         snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
 870         pr_reg->pr_reg_tpgt = tpgt;
 871         /*
 872          * Set pr_res_holder from caller, the pr_reg who is the reservation
 873          * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
 874          * the Initiator Node LUN ACL from the fabric module is created for
 875          * this registration.
 876          */
 877         pr_reg->pr_res_holder = res_holder;
 878
 879         list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
 880         pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
 881                         " metadata\n", (res_holder) ? "+reservation" : "");
 882         return 0;
 883 }
 884
 885 static void core_scsi3_aptpl_reserve(
 886         struct se_device *dev,
 887         struct se_portal_group *tpg,
 888         struct se_node_acl *node_acl,
 889         struct t10_pr_registration *pr_reg)
 890 {
 891         char i_buf[PR_REG_ISID_ID_LEN];
 892         int prf_isid;
 893
 894         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
 895         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
 896                                 PR_REG_ISID_ID_LEN);
 897
 898         spin_lock(&dev->dev_reservation_lock);
 899         dev->dev_pr_res_holder = pr_reg;
 900         spin_unlock(&dev->dev_reservation_lock);
 901
 902         pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
 903                 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
 904                 tpg->se_tpg_tfo->get_fabric_name(),
 905                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
 906                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
 907         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
 908                 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
 909                 (prf_isid) ? &i_buf[0] : "");
 910 }
 911
 912 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
 913                                 struct t10_pr_registration *, int, int);
 914
 915 static int __core_scsi3_check_aptpl_registration(
 916         struct se_device *dev,
 917         struct se_portal_group *tpg,
 918         struct se_lun *lun,
 919         u32 target_lun,
 920         struct se_node_acl *nacl,
 921         struct se_dev_entry *deve)
 922 {
 923         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
 924         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
 925         unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
 926         unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
 927         u16 tpgt;
 928
 929         memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
 930         memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
 931         /*
 932          * Copy Initiator Port information from struct se_node_acl
 933          */
 934         snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
 935         snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
 936                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 937         tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 938         /*
 939          * Look for the matching registrations+reservation from those
 940          * created from APTPL metadata.  Note that multiple registrations
 941          * may exist for fabrics that use ISIDs in their SCSI Initiator Port
 942          * TransportIDs.
 943          */
 944         spin_lock(&pr_tmpl->aptpl_reg_lock);
 945         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
 946                                 pr_reg_aptpl_list) {
 947                 if (!strcmp(pr_reg->pr_iport, i_port) &&
 948                      (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
 949                     !(strcmp(pr_reg->pr_tport, t_port)) &&
 950                      (pr_reg->pr_reg_tpgt == tpgt) &&
 951                      (pr_reg->pr_aptpl_target_lun == target_lun)) {
 952
 953                         pr_reg->pr_reg_nacl = nacl;
 954                         pr_reg->pr_reg_deve = deve;
 955                         pr_reg->pr_reg_tg_pt_lun = lun;
 956
 957                         list_del(&pr_reg->pr_reg_aptpl_list);
 958                         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 959                         /*
 960                          * At this point all of the pointers in *pr_reg will
 961                          * be setup, so go ahead and add the registration.
 962                          */
 963
 964                         __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
 965                         /*
 966                          * If this registration is the reservation holder,
 967                          * make that happen now..
 968                          */
 969                         if (pr_reg->pr_res_holder)
 970                                 core_scsi3_aptpl_reserve(dev, tpg,
 971                                                 nacl, pr_reg);
 972                         /*
 973                          * Reenable pr_aptpl_active to accept new metadata
 974                          * updates once the SCSI device is active again..
 975                          */
 976                         spin_lock(&pr_tmpl->aptpl_reg_lock);
 977                         pr_tmpl->pr_aptpl_active = 1;
 978                 }
 979         }
 980         spin_unlock(&pr_tmpl->aptpl_reg_lock);
 981
 982         return 0;
 983 }
 984
 985 int core_scsi3_check_aptpl_registration(
 986         struct se_device *dev,
 987         struct se_portal_group *tpg,
 988         struct se_lun *lun,
 989         struct se_lun_acl *lun_acl)
 990 {
 991         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 992         struct se_node_acl *nacl = lun_acl->se_lun_nacl;
 993         struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
 994
 995         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
 996                 return 0;
 997
 998         return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
 999                                 lun->unpacked_lun, nacl, deve);
1000 }
1001
1002 static void __core_scsi3_dump_registration(
1003         struct target_core_fabric_ops *tfo,
1004         struct se_device *dev,
1005         struct se_node_acl *nacl,
1006         struct t10_pr_registration *pr_reg,
1007         int register_type)
1008 {
1009         struct se_portal_group *se_tpg = nacl->se_tpg;
1010         char i_buf[PR_REG_ISID_ID_LEN];
1011         int prf_isid;
1012
1013         memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
1014         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1015                                 PR_REG_ISID_ID_LEN);
1016
1017         pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1018                 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
1019                 "_AND_MOVE" : (register_type == 1) ?
1020                 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
1021                 (prf_isid) ? i_buf : "");
1022         pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1023                  tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
1024                 tfo->tpg_get_tag(se_tpg));
1025         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1026                 " Port(s)\n",  tfo->get_fabric_name(),
1027                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1028                 dev->transport->name);
1029         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1030                 " 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
1031                 pr_reg->pr_res_key, pr_reg->pr_res_generation,
1032                 pr_reg->pr_reg_aptpl);
1033 }
1034
1035 /*
1036  * this function can be called with struct se_device->dev_reservation_lock
1037  * when register_move = 1
1038  */
1039 static void __core_scsi3_add_registration(
1040         struct se_device *dev,
1041         struct se_node_acl *nacl,
1042         struct t10_pr_registration *pr_reg,
1043         int register_type,
1044         int register_move)
1045 {
1046         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1047         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
1048         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1049         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1050
1051         /*
1052          * Increment PRgeneration counter for struct se_device upon a successful
1053          * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1054          *
1055          * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1056          * action, the struct se_device->dev_reservation_lock will already be held,
1057          * so we do not call core_scsi3_pr_generation() which grabs the lock
1058          * for the REGISTER.
1059          */
1060         pr_reg->pr_res_generation = (register_move) ?
1061                         su_dev->t10_pr.pr_generation++ :
1062                         core_scsi3_pr_generation(dev);
1063
1064         spin_lock(&pr_tmpl->registration_lock);
1065         list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1066         pr_reg->pr_reg_deve->def_pr_registered = 1;
1067
1068         __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1069         spin_unlock(&pr_tmpl->registration_lock);
1070         /*
1071          * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1072          */
1073         if (!pr_reg->pr_reg_all_tg_pt || register_move)
1074                 return;
1075         /*
1076          * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1077          * allocated in __core_scsi3_alloc_registration()
1078          */
1079         list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1080                         &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1081                 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1082
1083                 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1084
1085                 spin_lock(&pr_tmpl->registration_lock);
1086                 list_add_tail(&pr_reg_tmp->pr_reg_list,
1087                               &pr_tmpl->registration_list);
1088                 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1089
1090                 __core_scsi3_dump_registration(tfo, dev,
1091                                 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1092                                 register_type);
1093                 spin_unlock(&pr_tmpl->registration_lock);
1094                 /*
1095                  * Drop configfs group dependency reference from
1096                  * __core_scsi3_alloc_registration()
1097                  */
1098                 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1099         }
1100 }
1101
1102 static int core_scsi3_alloc_registration(
1103         struct se_device *dev,
1104         struct se_node_acl *nacl,
1105         struct se_dev_entry *deve,
1106         unsigned char *isid,
1107         u64 sa_res_key,
1108         int all_tg_pt,
1109         int aptpl,
1110         int register_type,
1111         int register_move)
1112 {
1113         struct t10_pr_registration *pr_reg;
1114
1115         pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1116                         sa_res_key, all_tg_pt, aptpl);
1117         if (!pr_reg)
1118                 return -EPERM;
1119
1120         __core_scsi3_add_registration(dev, nacl, pr_reg,
1121                         register_type, register_move);
1122         return 0;
1123 }
1124
1125 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1126         struct se_device *dev,
1127         struct se_node_acl *nacl,
1128         unsigned char *isid)
1129 {
1130         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1131         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1132         struct se_portal_group *tpg;
1133
1134         spin_lock(&pr_tmpl->registration_lock);
1135         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1136                         &pr_tmpl->registration_list, pr_reg_list) {
1137                 /*
1138                  * First look for a matching struct se_node_acl
1139                  */
1140                 if (pr_reg->pr_reg_nacl != nacl)
1141                         continue;
1142
1143                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1144                 /*
1145                  * If this registration does NOT contain a fabric provided
1146                  * ISID, then we have found a match.
1147                  */
1148                 if (!pr_reg->isid_present_at_reg) {
1149                         /*
1150                          * Determine if this SCSI device server requires that
1151                          * SCSI Intiatior TransportID w/ ISIDs is enforced
1152                          * for fabric modules (iSCSI) requiring them.
1153                          */
1154                         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1155                                 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1156                                         continue;
1157                         }
1158                         atomic_inc(&pr_reg->pr_res_holders);
1159                         smp_mb__after_atomic_inc();
1160                         spin_unlock(&pr_tmpl->registration_lock);
1161                         return pr_reg;
1162                 }
1163                 /*
1164                  * If the *pr_reg contains a fabric defined ISID for multi-value
1165                  * SCSI Initiator Port TransportIDs, then we expect a valid
1166                  * matching ISID to be provided by the local SCSI Initiator Port.
1167                  */
1168                 if (!isid)
1169                         continue;
1170                 if (strcmp(isid, pr_reg->pr_reg_isid))
1171                         continue;
1172
1173                 atomic_inc(&pr_reg->pr_res_holders);
1174                 smp_mb__after_atomic_inc();
1175                 spin_unlock(&pr_tmpl->registration_lock);
1176                 return pr_reg;
1177         }
1178         spin_unlock(&pr_tmpl->registration_lock);
1179
1180         return NULL;
1181 }
1182
1183 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1184         struct se_device *dev,
1185         struct se_node_acl *nacl,
1186         struct se_session *sess)
1187 {
1188         struct se_portal_group *tpg = nacl->se_tpg;
1189         unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1190
1191         if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1192                 memset(&buf[0], 0, PR_REG_ISID_LEN);
1193                 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1194                                         PR_REG_ISID_LEN);
1195                 isid_ptr = &buf[0];
1196         }
1197
1198         return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1199 }
1200
1201 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1202 {
1203         atomic_dec(&pr_reg->pr_res_holders);
1204         smp_mb__after_atomic_dec();
1205 }
1206
1207 static int core_scsi3_check_implict_release(
1208         struct se_device *dev,
1209         struct t10_pr_registration *pr_reg)
1210 {
1211         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1212         struct t10_pr_registration *pr_res_holder;
1213         int ret = 0;
1214
1215         spin_lock(&dev->dev_reservation_lock);
1216         pr_res_holder = dev->dev_pr_res_holder;
1217         if (!pr_res_holder) {
1218                 spin_unlock(&dev->dev_reservation_lock);
1219                 return ret;
1220         }
1221         if (pr_res_holder == pr_reg) {
1222                 /*
1223                  * Perform an implict RELEASE if the registration that
1224                  * is being released is holding the reservation.
1225                  *
1226                  * From spc4r17, section 5.7.11.1:
1227                  *
1228                  * e) If the I_T nexus is the persistent reservation holder
1229                  *    and the persistent reservation is not an all registrants
1230                  *    type, then a PERSISTENT RESERVE OUT command with REGISTER
1231                  *    service action or REGISTER AND  IGNORE EXISTING KEY
1232                  *    service action with the SERVICE ACTION RESERVATION KEY
1233                  *    field set to zero (see 5.7.11.3).
1234                  */
1235                 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1236                 ret = 1;
1237                 /*
1238                  * For 'All Registrants' reservation types, all existing
1239                  * registrations are still processed as reservation holders
1240                  * in core_scsi3_pr_seq_non_holder() after the initial
1241                  * reservation holder is implictly released here.
1242                  */
1243         } else if (pr_reg->pr_reg_all_tg_pt &&
1244                   (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1245                           pr_reg->pr_reg_nacl->initiatorname)) &&
1246                   (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1247                 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1248                         " UNREGISTER while existing reservation with matching"
1249                         " key 0x%016Lx is present from another SCSI Initiator"
1250                         " Port\n", pr_reg->pr_res_key);
1251                 ret = -EPERM;
1252         }
1253         spin_unlock(&dev->dev_reservation_lock);
1254
1255         return ret;
1256 }
1257
1258 /*
1259  * Called with struct t10_reservation->registration_lock held.
1260  */
1261 static void __core_scsi3_free_registration(
1262         struct se_device *dev,
1263         struct t10_pr_registration *pr_reg,
1264         struct list_head *preempt_and_abort_list,
1265         int dec_holders)
1266 {
1267         struct target_core_fabric_ops *tfo =
1268                         pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1269         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1270         char i_buf[PR_REG_ISID_ID_LEN];
1271         int prf_isid;
1272
1273         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1274         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1275                                 PR_REG_ISID_ID_LEN);
1276
1277         pr_reg->pr_reg_deve->def_pr_registered = 0;
1278         pr_reg->pr_reg_deve->pr_res_key = 0;
1279         list_del(&pr_reg->pr_reg_list);
1280         /*
1281          * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1282          * so call core_scsi3_put_pr_reg() to decrement our reference.
1283          */
1284         if (dec_holders)
1285                 core_scsi3_put_pr_reg(pr_reg);
1286         /*
1287          * Wait until all reference from any other I_T nexuses for this
1288          * *pr_reg have been released.  Because list_del() is called above,
1289          * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1290          * count back to zero, and we release *pr_reg.
1291          */
1292         while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1293                 spin_unlock(&pr_tmpl->registration_lock);
1294                 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1295                                 tfo->get_fabric_name());
1296                 cpu_relax();
1297                 spin_lock(&pr_tmpl->registration_lock);
1298         }
1299
1300         pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1301                 " Node: %s%s\n", tfo->get_fabric_name(),
1302                 pr_reg->pr_reg_nacl->initiatorname,
1303                 (prf_isid) ? &i_buf[0] : "");
1304         pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1305                 " Port(s)\n", tfo->get_fabric_name(),
1306                 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1307                 dev->transport->name);
1308         pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1309                 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1310                 pr_reg->pr_res_generation);
1311
1312         if (!preempt_and_abort_list) {
1313                 pr_reg->pr_reg_deve = NULL;
1314                 pr_reg->pr_reg_nacl = NULL;
1315                 kfree(pr_reg->pr_aptpl_buf);
1316                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1317                 return;
1318         }
1319         /*
1320          * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1321          * are released once the ABORT_TASK_SET has completed..
1322          */
1323         list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1324 }
1325
1326 void core_scsi3_free_pr_reg_from_nacl(
1327         struct se_device *dev,
1328         struct se_node_acl *nacl)
1329 {
1330         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1331         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1332         /*
1333          * If the passed se_node_acl matches the reservation holder,
1334          * release the reservation.
1335          */
1336         spin_lock(&dev->dev_reservation_lock);
1337         pr_res_holder = dev->dev_pr_res_holder;
1338         if ((pr_res_holder != NULL) &&
1339             (pr_res_holder->pr_reg_nacl == nacl))
1340                 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1341         spin_unlock(&dev->dev_reservation_lock);
1342         /*
1343          * Release any registration associated with the struct se_node_acl.
1344          */
1345         spin_lock(&pr_tmpl->registration_lock);
1346         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1347                         &pr_tmpl->registration_list, pr_reg_list) {
1348
1349                 if (pr_reg->pr_reg_nacl != nacl)
1350                         continue;
1351
1352                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1353         }
1354         spin_unlock(&pr_tmpl->registration_lock);
1355 }
1356
1357 void core_scsi3_free_all_registrations(
1358         struct se_device *dev)
1359 {
1360         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1361         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1362
1363         spin_lock(&dev->dev_reservation_lock);
1364         pr_res_holder = dev->dev_pr_res_holder;
1365         if (pr_res_holder != NULL) {
1366                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1367                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1368                                 pr_res_holder, 0);
1369         }
1370         spin_unlock(&dev->dev_reservation_lock);
1371
1372         spin_lock(&pr_tmpl->registration_lock);
1373         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1374                         &pr_tmpl->registration_list, pr_reg_list) {
1375
1376                 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1377         }
1378         spin_unlock(&pr_tmpl->registration_lock);
1379
1380         spin_lock(&pr_tmpl->aptpl_reg_lock);
1381         list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1382                                 pr_reg_aptpl_list) {
1383                 list_del(&pr_reg->pr_reg_aptpl_list);
1384                 kfree(pr_reg->pr_aptpl_buf);
1385                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1386         }
1387         spin_unlock(&pr_tmpl->aptpl_reg_lock);
1388 }
1389
1390 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1391 {
1392         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1393                         &tpg->tpg_group.cg_item);
1394 }
1395
1396 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1397 {
1398         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1399                         &tpg->tpg_group.cg_item);
1400
1401         atomic_dec(&tpg->tpg_pr_ref_count);
1402         smp_mb__after_atomic_dec();
1403 }
1404
1405 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1406 {
1407         struct se_portal_group *tpg = nacl->se_tpg;
1408
1409         if (nacl->dynamic_node_acl)
1410                 return 0;
1411
1412         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1413                         &nacl->acl_group.cg_item);
1414 }
1415
1416 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1417 {
1418         struct se_portal_group *tpg = nacl->se_tpg;
1419
1420         if (nacl->dynamic_node_acl) {
1421                 atomic_dec(&nacl->acl_pr_ref_count);
1422                 smp_mb__after_atomic_dec();
1423                 return;
1424         }
1425
1426         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1427                         &nacl->acl_group.cg_item);
1428
1429         atomic_dec(&nacl->acl_pr_ref_count);
1430         smp_mb__after_atomic_dec();
1431 }
1432
1433 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1434 {
1435         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1436         struct se_node_acl *nacl;
1437         struct se_portal_group *tpg;
1438         /*
1439          * For nacl->dynamic_node_acl=1
1440          */
1441         if (!lun_acl)
1442                 return 0;
1443
1444         nacl = lun_acl->se_lun_nacl;
1445         tpg = nacl->se_tpg;
1446
1447         return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1448                         &lun_acl->se_lun_group.cg_item);
1449 }
1450
1451 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1452 {
1453         struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1454         struct se_node_acl *nacl;
1455         struct se_portal_group *tpg;
1456         /*
1457          * For nacl->dynamic_node_acl=1
1458          */
1459         if (!lun_acl) {
1460                 atomic_dec(&se_deve->pr_ref_count);
1461                 smp_mb__after_atomic_dec();
1462                 return;
1463         }
1464         nacl = lun_acl->se_lun_nacl;
1465         tpg = nacl->se_tpg;
1466
1467         configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1468                         &lun_acl->se_lun_group.cg_item);
1469
1470         atomic_dec(&se_deve->pr_ref_count);
1471         smp_mb__after_atomic_dec();
1472 }
1473
1474 static int core_scsi3_decode_spec_i_port(
1475         struct se_cmd *cmd,
1476         struct se_portal_group *tpg,
1477         unsigned char *l_isid,
1478         u64 sa_res_key,
1479         int all_tg_pt,
1480         int aptpl)
1481 {
1482         struct se_device *dev = cmd->se_dev;
1483         struct se_port *tmp_port;
1484         struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1485         struct se_session *se_sess = cmd->se_sess;
1486         struct se_node_acl *dest_node_acl = NULL;
1487         struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1488         struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1489         struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1490         struct list_head tid_dest_list;
1491         struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1492         struct target_core_fabric_ops *tmp_tf_ops;
1493         unsigned char *buf;
1494         unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1495         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1496         u32 tpdl, tid_len = 0;
1497         int ret, dest_local_nexus, prf_isid;
1498         u32 dest_rtpi = 0;
1499
1500         memset(dest_iport, 0, 64);
1501         INIT_LIST_HEAD(&tid_dest_list);
1502
1503         local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1504         /*
1505          * Allocate a struct pr_transport_id_holder and setup the
1506          * local_node_acl and local_se_deve pointers and add to
1507          * struct list_head tid_dest_list for add registration
1508          * processing in the loop of tid_dest_list below.
1509          */
1510         tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1511         if (!tidh_new) {
1512                 pr_err("Unable to allocate tidh_new\n");
1513                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1514         }
1515         INIT_LIST_HEAD(&tidh_new->dest_list);
1516         tidh_new->dest_tpg = tpg;
1517         tidh_new->dest_node_acl = se_sess->se_node_acl;
1518         tidh_new->dest_se_deve = local_se_deve;
1519
1520         local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1521                                 se_sess->se_node_acl, local_se_deve, l_isid,
1522                                 sa_res_key, all_tg_pt, aptpl);
1523         if (!local_pr_reg) {
1524                 kfree(tidh_new);
1525                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1526         }
1527         tidh_new->dest_pr_reg = local_pr_reg;
1528         /*
1529          * The local I_T nexus does not hold any configfs dependances,
1530          * so we set tid_h->dest_local_nexus=1 to prevent the
1531          * configfs_undepend_item() calls in the tid_dest_list loops below.
1532          */
1533         tidh_new->dest_local_nexus = 1;
1534         list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1535
1536         buf = transport_kmap_first_data_page(cmd);
1537         /*
1538          * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1539          * first extract TransportID Parameter Data Length, and make sure
1540          * the value matches up to the SCSI expected data transfer length.
1541          */
1542         tpdl = (buf[24] & 0xff) << 24;
1543         tpdl |= (buf[25] & 0xff) << 16;
1544         tpdl |= (buf[26] & 0xff) << 8;
1545         tpdl |= buf[27] & 0xff;
1546
1547         if ((tpdl + 28) != cmd->data_length) {
1548                 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1549                         " does not equal CDB data_length: %u\n", tpdl,
1550                         cmd->data_length);
1551                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1552                 goto out;
1553         }
1554         /*
1555          * Start processing the received transport IDs using the
1556          * receiving I_T Nexus portal's fabric dependent methods to
1557          * obtain the SCSI Initiator Port/Device Identifiers.
1558          */
1559         ptr = &buf[28];
1560
1561         while (tpdl > 0) {
1562                 proto_ident = (ptr[0] & 0x0f);
1563                 dest_tpg = NULL;
1564
1565                 spin_lock(&dev->se_port_lock);
1566                 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1567                         tmp_tpg = tmp_port->sep_tpg;
1568                         if (!tmp_tpg)
1569                                 continue;
1570                         tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1571                         if (!tmp_tf_ops)
1572                                 continue;
1573                         if (!tmp_tf_ops->get_fabric_proto_ident ||
1574                             !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1575                                 continue;
1576                         /*
1577                          * Look for the matching proto_ident provided by
1578                          * the received TransportID
1579                          */
1580                         tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1581                         if (tmp_proto_ident != proto_ident)
1582                                 continue;
1583                         dest_rtpi = tmp_port->sep_rtpi;
1584
1585                         i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1586                                         tmp_tpg, (const char *)ptr, &tid_len,
1587                                         &iport_ptr);
1588                         if (!i_str)
1589                                 continue;
1590
1591                         atomic_inc(&tmp_tpg->tpg_pr_ref_count);
1592                         smp_mb__after_atomic_inc();
1593                         spin_unlock(&dev->se_port_lock);
1594
1595                         ret = core_scsi3_tpg_depend_item(tmp_tpg);
1596                         if (ret != 0) {
1597                                 pr_err(" core_scsi3_tpg_depend_item()"
1598                                         " for tmp_tpg\n");
1599                                 atomic_dec(&tmp_tpg->tpg_pr_ref_count);
1600                                 smp_mb__after_atomic_dec();
1601                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1602                                 goto out;
1603                         }
1604                         /*
1605                          * Locate the desination initiator ACL to be registered
1606                          * from the decoded fabric module specific TransportID
1607                          * at *i_str.
1608                          */
1609                         spin_lock_irq(&tmp_tpg->acl_node_lock);
1610                         dest_node_acl = __core_tpg_get_initiator_node_acl(
1611                                                 tmp_tpg, i_str);
1612                         if (dest_node_acl) {
1613                                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
1614                                 smp_mb__after_atomic_inc();
1615                         }
1616                         spin_unlock_irq(&tmp_tpg->acl_node_lock);
1617
1618                         if (!dest_node_acl) {
1619                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1620                                 spin_lock(&dev->se_port_lock);
1621                                 continue;
1622                         }
1623
1624                         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
1625                         if (ret != 0) {
1626                                 pr_err("configfs_depend_item() failed"
1627                                         " for dest_node_acl->acl_group\n");
1628                                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
1629                                 smp_mb__after_atomic_dec();
1630                                 core_scsi3_tpg_undepend_item(tmp_tpg);
1631                                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1632                                 goto out;
1633                         }
1634
1635                         dest_tpg = tmp_tpg;
1636                         pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1637                                 " %s Port RTPI: %hu\n",
1638                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1639                                 dest_node_acl->initiatorname, dest_rtpi);
1640
1641                         spin_lock(&dev->se_port_lock);
1642                         break;
1643                 }
1644                 spin_unlock(&dev->se_port_lock);
1645
1646                 if (!dest_tpg) {
1647                         pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1648                                         " dest_tpg\n");
1649                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1650                         goto out;
1651                 }
1652 #if 0
1653                 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1654                         " tid_len: %d for %s + %s\n",
1655                         dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1656                         tpdl, tid_len, i_str, iport_ptr);
1657 #endif
1658                 if (tid_len > tpdl) {
1659                         pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1660                                 " %u for Transport ID: %s\n", tid_len, ptr);
1661                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1662                         core_scsi3_tpg_undepend_item(dest_tpg);
1663                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1664                         goto out;
1665                 }
1666                 /*
1667                  * Locate the desintation struct se_dev_entry pointer for matching
1668                  * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1669                  * Target Port.
1670                  */
1671                 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1672                                         dest_rtpi);
1673                 if (!dest_se_deve) {
1674                         pr_err("Unable to locate %s dest_se_deve"
1675                                 " from destination RTPI: %hu\n",
1676                                 dest_tpg->se_tpg_tfo->get_fabric_name(),
1677                                 dest_rtpi);
1678
1679                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1680                         core_scsi3_tpg_undepend_item(dest_tpg);
1681                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1682                         goto out;
1683                 }
1684
1685                 ret = core_scsi3_lunacl_depend_item(dest_se_deve);
1686                 if (ret < 0) {
1687                         pr_err("core_scsi3_lunacl_depend_item()"
1688                                         " failed\n");
1689                         atomic_dec(&dest_se_deve->pr_ref_count);
1690                         smp_mb__after_atomic_dec();
1691                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1692                         core_scsi3_tpg_undepend_item(dest_tpg);
1693                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1694                         goto out;
1695                 }
1696 #if 0
1697                 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1698                         " dest_se_deve mapped_lun: %u\n",
1699                         dest_tpg->se_tpg_tfo->get_fabric_name(),
1700                         dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1701 #endif
1702                 /*
1703                  * Skip any TransportIDs that already have a registration for
1704                  * this target port.
1705                  */
1706                 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1707                                         iport_ptr);
1708                 if (pr_reg_e) {
1709                         core_scsi3_put_pr_reg(pr_reg_e);
1710                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1711                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1712                         core_scsi3_tpg_undepend_item(dest_tpg);
1713                         ptr += tid_len;
1714                         tpdl -= tid_len;
1715                         tid_len = 0;
1716                         continue;
1717                 }
1718                 /*
1719                  * Allocate a struct pr_transport_id_holder and setup
1720                  * the dest_node_acl and dest_se_deve pointers for the
1721                  * loop below.
1722                  */
1723                 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1724                                 GFP_KERNEL);
1725                 if (!tidh_new) {
1726                         pr_err("Unable to allocate tidh_new\n");
1727                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1728                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1729                         core_scsi3_tpg_undepend_item(dest_tpg);
1730                         ret = PYX_TRANSPORT_LU_COMM_FAILURE;
1731                         goto out;
1732                 }
1733                 INIT_LIST_HEAD(&tidh_new->dest_list);
1734                 tidh_new->dest_tpg = dest_tpg;
1735                 tidh_new->dest_node_acl = dest_node_acl;
1736                 tidh_new->dest_se_deve = dest_se_deve;
1737
1738                 /*
1739                  * Allocate, but do NOT add the registration for the
1740                  * TransportID referenced SCSI Initiator port.  This
1741                  * done because of the following from spc4r17 in section
1742                  * 6.14.3 wrt SPEC_I_PT:
1743                  *
1744                  * "If a registration fails for any initiator port (e.g., if th
1745                  * logical unit does not have enough resources available to
1746                  * hold the registration information), no registrations shall be
1747                  * made, and the command shall be terminated with
1748                  * CHECK CONDITION status."
1749                  *
1750                  * That means we call __core_scsi3_alloc_registration() here,
1751                  * and then call __core_scsi3_add_registration() in the
1752                  * 2nd loop which will never fail.
1753                  */
1754                 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1755                                 dest_node_acl, dest_se_deve, iport_ptr,
1756                                 sa_res_key, all_tg_pt, aptpl);
1757                 if (!dest_pr_reg) {
1758                         core_scsi3_lunacl_undepend_item(dest_se_deve);
1759                         core_scsi3_nodeacl_undepend_item(dest_node_acl);
1760                         core_scsi3_tpg_undepend_item(dest_tpg);
1761                         kfree(tidh_new);
1762                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
1763                         goto out;
1764                 }
1765                 tidh_new->dest_pr_reg = dest_pr_reg;
1766                 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1767
1768                 ptr += tid_len;
1769                 tpdl -= tid_len;
1770                 tid_len = 0;
1771
1772         }
1773
1774         transport_kunmap_first_data_page(cmd);
1775
1776         /*
1777          * Go ahead and create a registrations from tid_dest_list for the
1778          * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1779          * and dest_se_deve.
1780          *
1781          * The SA Reservation Key from the PROUT is set for the
1782          * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
1783          * means that the TransportID Initiator port will be
1784          * registered on all of the target ports in the SCSI target device
1785          * ALL_TG_PT=0 means the registration will only be for the
1786          * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1787          * was received.
1788          */
1789         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1790                 dest_tpg = tidh->dest_tpg;
1791                 dest_node_acl = tidh->dest_node_acl;
1792                 dest_se_deve = tidh->dest_se_deve;
1793                 dest_pr_reg = tidh->dest_pr_reg;
1794                 dest_local_nexus = tidh->dest_local_nexus;
1795
1796                 list_del(&tidh->dest_list);
1797                 kfree(tidh);
1798
1799                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1800                 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
1801                                                 PR_REG_ISID_ID_LEN);
1802
1803                 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1804                                         dest_pr_reg, 0, 0);
1805
1806                 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1807                         " registered Transport ID for Node: %s%s Mapped LUN:"
1808                         " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1809                         dest_node_acl->initiatorname, (prf_isid) ?
1810                         &i_buf[0] : "", dest_se_deve->mapped_lun);
1811
1812                 if (dest_local_nexus)
1813                         continue;
1814
1815                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1816                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1817                 core_scsi3_tpg_undepend_item(dest_tpg);
1818         }
1819
1820         return 0;
1821 out:
1822         transport_kunmap_first_data_page(cmd);
1823         /*
1824          * For the failure case, release everything from tid_dest_list
1825          * including *dest_pr_reg and the configfs dependances..
1826          */
1827         list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1828                 dest_tpg = tidh->dest_tpg;
1829                 dest_node_acl = tidh->dest_node_acl;
1830                 dest_se_deve = tidh->dest_se_deve;
1831                 dest_pr_reg = tidh->dest_pr_reg;
1832                 dest_local_nexus = tidh->dest_local_nexus;
1833
1834                 list_del(&tidh->dest_list);
1835                 kfree(tidh);
1836                 /*
1837                  * Release any extra ALL_TG_PT=1 registrations for
1838                  * the SPEC_I_PT=1 case.
1839                  */
1840                 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1841                                 &dest_pr_reg->pr_reg_atp_list,
1842                                 pr_reg_atp_mem_list) {
1843                         list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1844                         core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1845                         kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1846                 }
1847
1848                 kfree(dest_pr_reg->pr_aptpl_buf);
1849                 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1850
1851                 if (dest_local_nexus)
1852                         continue;
1853
1854                 core_scsi3_lunacl_undepend_item(dest_se_deve);
1855                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1856                 core_scsi3_tpg_undepend_item(dest_tpg);
1857         }
1858         return ret;
1859 }
1860
1861 /*
1862  * Called with struct se_device->dev_reservation_lock held
1863  */
1864 static int __core_scsi3_update_aptpl_buf(
1865         struct se_device *dev,
1866         unsigned char *buf,
1867         u32 pr_aptpl_buf_len,
1868         int clear_aptpl_metadata)
1869 {
1870         struct se_lun *lun;
1871         struct se_portal_group *tpg;
1872         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1873         struct t10_pr_registration *pr_reg;
1874         unsigned char tmp[512], isid_buf[32];
1875         ssize_t len = 0;
1876         int reg_count = 0;
1877
1878         memset(buf, 0, pr_aptpl_buf_len);
1879         /*
1880          * Called to clear metadata once APTPL has been deactivated.
1881          */
1882         if (clear_aptpl_metadata) {
1883                 snprintf(buf, pr_aptpl_buf_len,
1884                                 "No Registrations or Reservations\n");
1885                 return 0;
1886         }
1887         /*
1888          * Walk the registration list..
1889          */
1890         spin_lock(&su_dev->t10_pr.registration_lock);
1891         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1892                         pr_reg_list) {
1893
1894                 tmp[0] = '\0';
1895                 isid_buf[0] = '\0';
1896                 tpg = pr_reg->pr_reg_nacl->se_tpg;
1897                 lun = pr_reg->pr_reg_tg_pt_lun;
1898                 /*
1899                  * Write out any ISID value to APTPL metadata that was included
1900                  * in the original registration.
1901                  */
1902                 if (pr_reg->isid_present_at_reg)
1903                         snprintf(isid_buf, 32, "initiator_sid=%s\n",
1904                                         pr_reg->pr_reg_isid);
1905                 /*
1906                  * Include special metadata if the pr_reg matches the
1907                  * reservation holder.
1908                  */
1909                 if (dev->dev_pr_res_holder == pr_reg) {
1910                         snprintf(tmp, 512, "PR_REG_START: %d"
1911                                 "\ninitiator_fabric=%s\n"
1912                                 "initiator_node=%s\n%s"
1913                                 "sa_res_key=%llu\n"
1914                                 "res_holder=1\nres_type=%02x\n"
1915                                 "res_scope=%02x\nres_all_tg_pt=%d\n"
1916                                 "mapped_lun=%u\n", reg_count,
1917                                 tpg->se_tpg_tfo->get_fabric_name(),
1918                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1919                                 pr_reg->pr_res_key, pr_reg->pr_res_type,
1920                                 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1921                                 pr_reg->pr_res_mapped_lun);
1922                 } else {
1923                         snprintf(tmp, 512, "PR_REG_START: %d\n"
1924                                 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1925                                 "sa_res_key=%llu\nres_holder=0\n"
1926                                 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1927                                 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1928                                 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1929                                 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1930                                 pr_reg->pr_res_mapped_lun);
1931                 }
1932
1933                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1934                         pr_err("Unable to update renaming"
1935                                 " APTPL metadata\n");
1936                         spin_unlock(&su_dev->t10_pr.registration_lock);
1937                         return -EMSGSIZE;
1938                 }
1939                 len += sprintf(buf+len, "%s", tmp);
1940
1941                 /*
1942                  * Include information about the associated SCSI target port.
1943                  */
1944                 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1945                         "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1946                         " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1947                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1948                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
1949                         lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1950
1951                 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1952                         pr_err("Unable to update renaming"
1953                                 " APTPL metadata\n");
1954                         spin_unlock(&su_dev->t10_pr.registration_lock);
1955                         return -EMSGSIZE;
1956                 }
1957                 len += sprintf(buf+len, "%s", tmp);
1958                 reg_count++;
1959         }
1960         spin_unlock(&su_dev->t10_pr.registration_lock);
1961
1962         if (!reg_count)
1963                 len += sprintf(buf+len, "No Registrations or Reservations");
1964
1965         return 0;
1966 }
1967
1968 static int core_scsi3_update_aptpl_buf(
1969         struct se_device *dev,
1970         unsigned char *buf,
1971         u32 pr_aptpl_buf_len,
1972         int clear_aptpl_metadata)
1973 {
1974         int ret;
1975
1976         spin_lock(&dev->dev_reservation_lock);
1977         ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
1978                                 clear_aptpl_metadata);
1979         spin_unlock(&dev->dev_reservation_lock);
1980
1981         return ret;
1982 }
1983
1984 /*
1985  * Called with struct se_device->aptpl_file_mutex held
1986  */
1987 static int __core_scsi3_write_aptpl_to_file(
1988         struct se_device *dev,
1989         unsigned char *buf,
1990         u32 pr_aptpl_buf_len)
1991 {
1992         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1993         struct file *file;
1994         struct iovec iov[1];
1995         mm_segment_t old_fs;
1996         int flags = O_RDWR | O_CREAT | O_TRUNC;
1997         char path[512];
1998         int ret;
1999
2000         memset(iov, 0, sizeof(struct iovec));
2001         memset(path, 0, 512);
2002
2003         if (strlen(&wwn->unit_serial[0]) >= 512) {
2004                 pr_err("WWN value for struct se_device does not fit"
2005                         " into path buffer\n");
2006                 return -EMSGSIZE;
2007         }
2008
2009         snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
2010         file = filp_open(path, flags, 0600);
2011         if (IS_ERR(file) || !file || !file->f_dentry) {
2012                 pr_err("filp_open(%s) for APTPL metadata"
2013                         " failed\n", path);
2014                 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
2015         }
2016
2017         iov[0].iov_base = &buf[0];
2018         if (!pr_aptpl_buf_len)
2019                 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
2020         else
2021                 iov[0].iov_len = pr_aptpl_buf_len;
2022
2023         old_fs = get_fs();
2024         set_fs(get_ds());
2025         ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
2026         set_fs(old_fs);
2027
2028         if (ret < 0) {
2029                 pr_debug("Error writing APTPL metadata file: %s\n", path);
2030                 filp_close(file, NULL);
2031                 return -EIO;
2032         }
2033         filp_close(file, NULL);
2034
2035         return 0;
2036 }
2037
2038 static int core_scsi3_update_and_write_aptpl(
2039         struct se_device *dev,
2040         unsigned char *in_buf,
2041         u32 in_pr_aptpl_buf_len)
2042 {
2043         unsigned char null_buf[64], *buf;
2044         u32 pr_aptpl_buf_len;
2045         int ret, clear_aptpl_metadata = 0;
2046         /*
2047          * Can be called with a NULL pointer from PROUT service action CLEAR
2048          */
2049         if (!in_buf) {
2050                 memset(null_buf, 0, 64);
2051                 buf = &null_buf[0];
2052                 /*
2053                  * This will clear the APTPL metadata to:
2054                  * "No Registrations or Reservations" status
2055                  */
2056                 pr_aptpl_buf_len = 64;
2057                 clear_aptpl_metadata = 1;
2058         } else {
2059                 buf = in_buf;
2060                 pr_aptpl_buf_len = in_pr_aptpl_buf_len;
2061         }
2062
2063         ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
2064                                 clear_aptpl_metadata);
2065         if (ret != 0)
2066                 return ret;
2067         /*
2068          * __core_scsi3_write_aptpl_to_file() will call strlen()
2069          * on the passed buf to determine pr_aptpl_buf_len.
2070          */
2071         ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
2072         if (ret != 0)
2073                 return ret;
2074
2075         return ret;
2076 }
2077
2078 static int core_scsi3_emulate_pro_register(
2079         struct se_cmd *cmd,
2080         u64 res_key,
2081         u64 sa_res_key,
2082         int aptpl,
2083         int all_tg_pt,
2084         int spec_i_pt,
2085         int ignore_key)
2086 {
2087         struct se_session *se_sess = cmd->se_sess;
2088         struct se_device *dev = cmd->se_dev;
2089         struct se_dev_entry *se_deve;
2090         struct se_lun *se_lun = cmd->se_lun;
2091         struct se_portal_group *se_tpg;
2092         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
2093         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2094         /* Used for APTPL metadata w/ UNREGISTER */
2095         unsigned char *pr_aptpl_buf = NULL;
2096         unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
2097         int pr_holder = 0, ret = 0, type;
2098
2099         if (!se_sess || !se_lun) {
2100                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2101                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2102         }
2103         se_tpg = se_sess->se_tpg;
2104         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2105
2106         if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2107                 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2108                 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2109                                 PR_REG_ISID_LEN);
2110                 isid_ptr = &isid_buf[0];
2111         }
2112         /*
2113          * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2114          */
2115         pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2116         if (!pr_reg_e) {
2117                 if (res_key) {
2118                         pr_warn("SPC-3 PR: Reservation Key non-zero"
2119                                 " for SA REGISTER, returning CONFLICT\n");
2120                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2121                 }
2122                 /*
2123                  * Do nothing but return GOOD status.
2124                  */
2125                 if (!sa_res_key)
2126                         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2127
2128                 if (!spec_i_pt) {
2129                         /*
2130                          * Perform the Service Action REGISTER on the Initiator
2131                          * Port Endpoint that the PRO was received from on the
2132                          * Logical Unit of the SCSI device server.
2133                          */
2134                         ret = core_scsi3_alloc_registration(cmd->se_dev,
2135                                         se_sess->se_node_acl, se_deve, isid_ptr,
2136                                         sa_res_key, all_tg_pt, aptpl,
2137                                         ignore_key, 0);
2138                         if (ret != 0) {
2139                                 pr_err("Unable to allocate"
2140                                         " struct t10_pr_registration\n");
2141                                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2142                         }
2143                 } else {
2144                         /*
2145                          * Register both the Initiator port that received
2146                          * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2147                          * TransportID from Parameter list and loop through
2148                          * fabric dependent parameter list while calling
2149                          * logic from of core_scsi3_alloc_registration() for
2150                          * each TransportID provided SCSI Initiator Port/Device
2151                          */
2152                         ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2153                                         isid_ptr, sa_res_key, all_tg_pt, aptpl);
2154                         if (ret != 0)
2155                                 return ret;
2156                 }
2157                 /*
2158                  * Nothing left to do for the APTPL=0 case.
2159                  */
2160                 if (!aptpl) {
2161                         pr_tmpl->pr_aptpl_active = 0;
2162                         core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2163                         pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2164                                         " REGISTER\n");
2165                         return 0;
2166                 }
2167                 /*
2168                  * Locate the newly allocated local I_T Nexus *pr_reg, and
2169                  * update the APTPL metadata information using its
2170                  * preallocated *pr_reg->pr_aptpl_buf.
2171                  */
2172                 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
2173                                 se_sess->se_node_acl, se_sess);
2174
2175                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2176                                 &pr_reg->pr_aptpl_buf[0],
2177                                 pr_tmpl->pr_aptpl_buf_len);
2178                 if (!ret) {
2179                         pr_tmpl->pr_aptpl_active = 1;
2180                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2181                 }
2182
2183                 core_scsi3_put_pr_reg(pr_reg);
2184                 return ret;
2185         } else {
2186                 /*
2187                  * Locate the existing *pr_reg via struct se_node_acl pointers
2188                  */
2189                 pr_reg = pr_reg_e;
2190                 type = pr_reg->pr_res_type;
2191
2192                 if (!ignore_key) {
2193                         if (res_key != pr_reg->pr_res_key) {
2194                                 pr_err("SPC-3 PR REGISTER: Received"
2195                                         " res_key: 0x%016Lx does not match"
2196                                         " existing SA REGISTER res_key:"
2197                                         " 0x%016Lx\n", res_key,
2198                                         pr_reg->pr_res_key);
2199                                 core_scsi3_put_pr_reg(pr_reg);
2200                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2201                         }
2202                 }
2203                 if (spec_i_pt) {
2204                         pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
2205                                 " set while sa_res_key=0\n");
2206                         core_scsi3_put_pr_reg(pr_reg);
2207                         return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2208                 }
2209                 /*
2210                  * An existing ALL_TG_PT=1 registration being released
2211                  * must also set ALL_TG_PT=1 in the incoming PROUT.
2212                  */
2213                 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
2214                         pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
2215                                 " registration exists, but ALL_TG_PT=1 bit not"
2216                                 " present in received PROUT\n");
2217                         core_scsi3_put_pr_reg(pr_reg);
2218                         return PYX_TRANSPORT_INVALID_CDB_FIELD;
2219                 }
2220                 /*
2221                  * Allocate APTPL metadata buffer used for UNREGISTER ops
2222                  */
2223                 if (aptpl) {
2224                         pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
2225                                                 GFP_KERNEL);
2226                         if (!pr_aptpl_buf) {
2227                                 pr_err("Unable to allocate"
2228                                         " pr_aptpl_buf\n");
2229                                 core_scsi3_put_pr_reg(pr_reg);
2230                                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2231                         }
2232                 }
2233                 /*
2234                  * sa_res_key=0 Unregister Reservation Key for registered I_T
2235                  * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2236                  * Nexus.
2237                  */
2238                 if (!sa_res_key) {
2239                         pr_holder = core_scsi3_check_implict_release(
2240                                         cmd->se_dev, pr_reg);
2241                         if (pr_holder < 0) {
2242                                 kfree(pr_aptpl_buf);
2243                                 core_scsi3_put_pr_reg(pr_reg);
2244                                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2245                         }
2246
2247                         spin_lock(&pr_tmpl->registration_lock);
2248                         /*
2249                          * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2250                          * and matching pr_res_key.
2251                          */
2252                         if (pr_reg->pr_reg_all_tg_pt) {
2253                                 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2254                                                 &pr_tmpl->registration_list,
2255                                                 pr_reg_list) {
2256
2257                                         if (!pr_reg_p->pr_reg_all_tg_pt)
2258                                                 continue;
2259
2260                                         if (pr_reg_p->pr_res_key != res_key)
2261                                                 continue;
2262
2263                                         if (pr_reg == pr_reg_p)
2264                                                 continue;
2265
2266                                         if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2267                                                    pr_reg_p->pr_reg_nacl->initiatorname))
2268                                                 continue;
2269
2270                                         __core_scsi3_free_registration(dev,
2271                                                         pr_reg_p, NULL, 0);
2272                                 }
2273                         }
2274                         /*
2275                          * Release the calling I_T Nexus registration now..
2276                          */
2277                         __core_scsi3_free_registration(cmd->se_dev, pr_reg,
2278                                                         NULL, 1);
2279                         /*
2280                          * From spc4r17, section 5.7.11.3 Unregistering
2281                          *
2282                          * If the persistent reservation is a registrants only
2283                          * type, the device server shall establish a unit
2284                          * attention condition for the initiator port associated
2285                          * with every registered I_T nexus except for the I_T
2286                          * nexus on which the PERSISTENT RESERVE OUT command was
2287                          * received, with the additional sense code set to
2288                          * RESERVATIONS RELEASED.
2289                          */
2290                         if (pr_holder &&
2291                            ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
2292                             (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
2293                                 list_for_each_entry(pr_reg_p,
2294                                                 &pr_tmpl->registration_list,
2295                                                 pr_reg_list) {
2296
2297                                         core_scsi3_ua_allocate(
2298                                                 pr_reg_p->pr_reg_nacl,
2299                                                 pr_reg_p->pr_res_mapped_lun,
2300                                                 0x2A,
2301                                                 ASCQ_2AH_RESERVATIONS_RELEASED);
2302                                 }
2303                         }
2304                         spin_unlock(&pr_tmpl->registration_lock);
2305
2306                         if (!aptpl) {
2307                                 pr_tmpl->pr_aptpl_active = 0;
2308                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2309                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2310                                                 " for UNREGISTER\n");
2311                                 return 0;
2312                         }
2313
2314                         ret = core_scsi3_update_and_write_aptpl(dev,
2315                                         &pr_aptpl_buf[0],
2316                                         pr_tmpl->pr_aptpl_buf_len);
2317                         if (!ret) {
2318                                 pr_tmpl->pr_aptpl_active = 1;
2319                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2320                                                 " for UNREGISTER\n");
2321                         }
2322
2323                         kfree(pr_aptpl_buf);
2324                         return ret;
2325                 } else {
2326                         /*
2327                          * Increment PRgeneration counter for struct se_device"
2328                          * upon a successful REGISTER, see spc4r17 section 6.3.2
2329                          * READ_KEYS service action.
2330                          */
2331                         pr_reg->pr_res_generation = core_scsi3_pr_generation(
2332                                                         cmd->se_dev);
2333                         pr_reg->pr_res_key = sa_res_key;
2334                         pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2335                                 " Key for %s to: 0x%016Lx PRgeneration:"
2336                                 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2337                                 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
2338                                 pr_reg->pr_reg_nacl->initiatorname,
2339                                 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2340
2341                         if (!aptpl) {
2342                                 pr_tmpl->pr_aptpl_active = 0;
2343                                 core_scsi3_update_and_write_aptpl(dev, NULL, 0);
2344                                 core_scsi3_put_pr_reg(pr_reg);
2345                                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2346                                                 " for REGISTER\n");
2347                                 return 0;
2348                         }
2349
2350                         ret = core_scsi3_update_and_write_aptpl(dev,
2351                                         &pr_aptpl_buf[0],
2352                                         pr_tmpl->pr_aptpl_buf_len);
2353                         if (!ret) {
2354                                 pr_tmpl->pr_aptpl_active = 1;
2355                                 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2356                                                 " for REGISTER\n");
2357                         }
2358
2359                         kfree(pr_aptpl_buf);
2360                         core_scsi3_put_pr_reg(pr_reg);
2361                 }
2362         }
2363         return 0;
2364 }
2365
2366 unsigned char *core_scsi3_pr_dump_type(int type)
2367 {
2368         switch (type) {
2369         case PR_TYPE_WRITE_EXCLUSIVE:
2370                 return "Write Exclusive Access";
2371         case PR_TYPE_EXCLUSIVE_ACCESS:
2372                 return "Exclusive Access";
2373         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2374                 return "Write Exclusive Access, Registrants Only";
2375         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2376                 return "Exclusive Access, Registrants Only";
2377         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2378                 return "Write Exclusive Access, All Registrants";
2379         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2380                 return "Exclusive Access, All Registrants";
2381         default:
2382                 break;
2383         }
2384
2385         return "Unknown SPC-3 PR Type";
2386 }
2387
2388 static int core_scsi3_pro_reserve(
2389         struct se_cmd *cmd,
2390         struct se_device *dev,
2391         int type,
2392         int scope,
2393         u64 res_key)
2394 {
2395         struct se_session *se_sess = cmd->se_sess;
2396         struct se_dev_entry *se_deve;
2397         struct se_lun *se_lun = cmd->se_lun;
2398         struct se_portal_group *se_tpg;
2399         struct t10_pr_registration *pr_reg, *pr_res_holder;
2400         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2401         char i_buf[PR_REG_ISID_ID_LEN];
2402         int ret, prf_isid;
2403
2404         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2405
2406         if (!se_sess || !se_lun) {
2407                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2408                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2409         }
2410         se_tpg = se_sess->se_tpg;
2411         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2412         /*
2413          * Locate the existing *pr_reg via struct se_node_acl pointers
2414          */
2415         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2416                                 se_sess);
2417         if (!pr_reg) {
2418                 pr_err("SPC-3 PR: Unable to locate"
2419                         " PR_REGISTERED *pr_reg for RESERVE\n");
2420                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2421         }
2422         /*
2423          * From spc4r17 Section 5.7.9: Reserving:
2424          *
2425          * An application client creates a persistent reservation by issuing
2426          * a PERSISTENT RESERVE OUT command with RESERVE service action through
2427          * a registered I_T nexus with the following parameters:
2428          *    a) RESERVATION KEY set to the value of the reservation key that is
2429          *       registered with the logical unit for the I_T nexus; and
2430          */
2431         if (res_key != pr_reg->pr_res_key) {
2432                 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2433                         " does not match existing SA REGISTER res_key:"
2434                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2435                 core_scsi3_put_pr_reg(pr_reg);
2436                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2437         }
2438         /*
2439          * From spc4r17 Section 5.7.9: Reserving:
2440          *
2441          * From above:
2442          *  b) TYPE field and SCOPE field set to the persistent reservation
2443          *     being created.
2444          *
2445          * Only one persistent reservation is allowed at a time per logical unit
2446          * and that persistent reservation has a scope of LU_SCOPE.
2447          */
2448         if (scope != PR_SCOPE_LU_SCOPE) {
2449                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2450                 core_scsi3_put_pr_reg(pr_reg);
2451                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
2452         }
2453         /*
2454          * See if we have an existing PR reservation holder pointer at
2455          * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2456          * *pr_res_holder.
2457          */
2458         spin_lock(&dev->dev_reservation_lock);
2459         pr_res_holder = dev->dev_pr_res_holder;
2460         if ((pr_res_holder)) {
2461                 /*
2462                  * From spc4r17 Section 5.7.9: Reserving:
2463                  *
2464                  * If the device server receives a PERSISTENT RESERVE OUT
2465                  * command from an I_T nexus other than a persistent reservation
2466                  * holder (see 5.7.10) that attempts to create a persistent
2467                  * reservation when a persistent reservation already exists for
2468                  * the logical unit, then the command shall be completed with
2469                  * RESERVATION CONFLICT status.
2470                  */
2471                 if (pr_res_holder != pr_reg) {
2472                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2473                         pr_err("SPC-3 PR: Attempted RESERVE from"
2474                                 " [%s]: %s while reservation already held by"
2475                                 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2476                                 cmd->se_tfo->get_fabric_name(),
2477                                 se_sess->se_node_acl->initiatorname,
2478                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2479                                 pr_res_holder->pr_reg_nacl->initiatorname);
2480
2481                         spin_unlock(&dev->dev_reservation_lock);
2482                         core_scsi3_put_pr_reg(pr_reg);
2483                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2484                 }
2485                 /*
2486                  * From spc4r17 Section 5.7.9: Reserving:
2487                  *
2488                  * If a persistent reservation holder attempts to modify the
2489                  * type or scope of an existing persistent reservation, the
2490                  * command shall be completed with RESERVATION CONFLICT status.
2491                  */
2492                 if ((pr_res_holder->pr_res_type != type) ||
2493                     (pr_res_holder->pr_res_scope != scope)) {
2494                         struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2495                         pr_err("SPC-3 PR: Attempted RESERVE from"
2496                                 " [%s]: %s trying to change TYPE and/or SCOPE,"
2497                                 " while reservation already held by [%s]: %s,"
2498                                 " returning RESERVATION_CONFLICT\n",
2499                                 cmd->se_tfo->get_fabric_name(),
2500                                 se_sess->se_node_acl->initiatorname,
2501                                 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2502                                 pr_res_holder->pr_reg_nacl->initiatorname);
2503
2504                         spin_unlock(&dev->dev_reservation_lock);
2505                         core_scsi3_put_pr_reg(pr_reg);
2506                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
2507                 }
2508                 /*
2509                  * From spc4r17 Section 5.7.9: Reserving:
2510                  *
2511                  * If the device server receives a PERSISTENT RESERVE OUT
2512                  * command with RESERVE service action where the TYPE field and
2513                  * the SCOPE field contain the same values as the existing type
2514                  * and scope from a persistent reservation holder, it shall not
2515                  * make any change to the existing persistent reservation and
2516                  * shall completethe command with GOOD status.
2517                  */
2518                 spin_unlock(&dev->dev_reservation_lock);
2519                 core_scsi3_put_pr_reg(pr_reg);
2520                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2521         }
2522         /*
2523          * Otherwise, our *pr_reg becomes the PR reservation holder for said
2524          * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
2525          */
2526         pr_reg->pr_res_scope = scope;
2527         pr_reg->pr_res_type = type;
2528         pr_reg->pr_res_holder = 1;
2529         dev->dev_pr_res_holder = pr_reg;
2530         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2531                                 PR_REG_ISID_ID_LEN);
2532
2533         pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2534                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2535                 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2536                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2537         pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2538                         cmd->se_tfo->get_fabric_name(),
2539                         se_sess->se_node_acl->initiatorname,
2540                         (prf_isid) ? &i_buf[0] : "");
2541         spin_unlock(&dev->dev_reservation_lock);
2542
2543         if (pr_tmpl->pr_aptpl_active) {
2544                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2545                                 &pr_reg->pr_aptpl_buf[0],
2546                                 pr_tmpl->pr_aptpl_buf_len);
2547                 if (!ret)
2548                         pr_debug("SPC-3 PR: Updated APTPL metadata"
2549                                         " for RESERVE\n");
2550         }
2551
2552         core_scsi3_put_pr_reg(pr_reg);
2553         return 0;
2554 }
2555
2556 static int core_scsi3_emulate_pro_reserve(
2557         struct se_cmd *cmd,
2558         int type,
2559         int scope,
2560         u64 res_key)
2561 {
2562         struct se_device *dev = cmd->se_dev;
2563         int ret = 0;
2564
2565         switch (type) {
2566         case PR_TYPE_WRITE_EXCLUSIVE:
2567         case PR_TYPE_EXCLUSIVE_ACCESS:
2568         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2569         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2570         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2571         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2572                 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
2573                 break;
2574         default:
2575                 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2576                         " 0x%02x\n", type);
2577                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
2578         }
2579
2580         return ret;
2581 }
2582
2583 /*
2584  * Called with struct se_device->dev_reservation_lock held.
2585  */
2586 static void __core_scsi3_complete_pro_release(
2587         struct se_device *dev,
2588         struct se_node_acl *se_nacl,
2589         struct t10_pr_registration *pr_reg,
2590         int explict)
2591 {
2592         struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2593         char i_buf[PR_REG_ISID_ID_LEN];
2594         int prf_isid;
2595
2596         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2597         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2598                                 PR_REG_ISID_ID_LEN);
2599         /*
2600          * Go ahead and release the current PR reservation holder.
2601          */
2602         dev->dev_pr_res_holder = NULL;
2603
2604         pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2605                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2606                 tfo->get_fabric_name(), (explict) ? "explict" : "implict",
2607                 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2608                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2609         pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2610                 tfo->get_fabric_name(), se_nacl->initiatorname,
2611                 (prf_isid) ? &i_buf[0] : "");
2612         /*
2613          * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2614          */
2615         pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2616 }
2617
2618 static int core_scsi3_emulate_pro_release(
2619         struct se_cmd *cmd,
2620         int type,
2621         int scope,
2622         u64 res_key)
2623 {
2624         struct se_device *dev = cmd->se_dev;
2625         struct se_session *se_sess = cmd->se_sess;
2626         struct se_lun *se_lun = cmd->se_lun;
2627         struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2628         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2629         int ret, all_reg = 0;
2630
2631         if (!se_sess || !se_lun) {
2632                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2633                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2634         }
2635         /*
2636          * Locate the existing *pr_reg via struct se_node_acl pointers
2637          */
2638         pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2639         if (!pr_reg) {
2640                 pr_err("SPC-3 PR: Unable to locate"
2641                         " PR_REGISTERED *pr_reg for RELEASE\n");
2642                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2643         }
2644         /*
2645          * From spc4r17 Section 5.7.11.2 Releasing:
2646          *
2647          * If there is no persistent reservation or in response to a persistent
2648          * reservation release request from a registered I_T nexus that is not a
2649          * persistent reservation holder (see 5.7.10), the device server shall
2650          * do the following:
2651          *
2652          *     a) Not release the persistent reservation, if any;
2653          *     b) Not remove any registrations; and
2654          *     c) Complete the command with GOOD status.
2655          */
2656         spin_lock(&dev->dev_reservation_lock);
2657         pr_res_holder = dev->dev_pr_res_holder;
2658         if (!pr_res_holder) {
2659                 /*
2660                  * No persistent reservation, return GOOD status.
2661                  */
2662                 spin_unlock(&dev->dev_reservation_lock);
2663                 core_scsi3_put_pr_reg(pr_reg);
2664                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2665         }
2666         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2667             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2668                 all_reg = 1;
2669
2670         if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2671                 /*
2672                  * Non 'All Registrants' PR Type cases..
2673                  * Release request from a registered I_T nexus that is not a
2674                  * persistent reservation holder. return GOOD status.
2675                  */
2676                 spin_unlock(&dev->dev_reservation_lock);
2677                 core_scsi3_put_pr_reg(pr_reg);
2678                 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
2679         }
2680         /*
2681          * From spc4r17 Section 5.7.11.2 Releasing:
2682          *
2683          * Only the persistent reservation holder (see 5.7.10) is allowed to
2684          * release a persistent reservation.
2685          *
2686          * An application client releases the persistent reservation by issuing
2687          * a PERSISTENT RESERVE OUT command with RELEASE service action through
2688          * an I_T nexus that is a persistent reservation holder with the
2689          * following parameters:
2690          *
2691          *     a) RESERVATION KEY field set to the value of the reservation key
2692          *        that is registered with the logical unit for the I_T nexus;
2693          */
2694         if (res_key != pr_reg->pr_res_key) {
2695                 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2696                         " does not match existing SA REGISTER res_key:"
2697                         " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2698                 spin_unlock(&dev->dev_reservation_lock);
2699                 core_scsi3_put_pr_reg(pr_reg);
2700                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2701         }
2702         /*
2703          * From spc4r17 Section 5.7.11.2 Releasing and above:
2704          *
2705          * b) TYPE field and SCOPE field set to match the persistent
2706          *    reservation being released.
2707          */
2708         if ((pr_res_holder->pr_res_type != type) ||
2709             (pr_res_holder->pr_res_scope != scope)) {
2710                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2711                 pr_err("SPC-3 PR RELEASE: Attempted to release"
2712                         " reservation from [%s]: %s with different TYPE "
2713                         "and/or SCOPE  while reservation already held by"
2714                         " [%s]: %s, returning RESERVATION_CONFLICT\n",
2715                         cmd->se_tfo->get_fabric_name(),
2716                         se_sess->se_node_acl->initiatorname,
2717                         pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2718                         pr_res_holder->pr_reg_nacl->initiatorname);
2719
2720                 spin_unlock(&dev->dev_reservation_lock);
2721                 core_scsi3_put_pr_reg(pr_reg);
2722                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2723         }
2724         /*
2725          * In response to a persistent reservation release request from the
2726          * persistent reservation holder the device server shall perform a
2727          * release by doing the following as an uninterrupted series of actions:
2728          * a) Release the persistent reservation;
2729          * b) Not remove any registration(s);
2730          * c) If the released persistent reservation is a registrants only type
2731          * or all registrants type persistent reservation,
2732          *    the device server shall establish a unit attention condition for
2733          *    the initiator port associated with every regis-
2734          *    tered I_T nexus other than I_T nexus on which the PERSISTENT
2735          *    RESERVE OUT command with RELEASE service action was received,
2736          *    with the additional sense code set to RESERVATIONS RELEASED; and
2737          * d) If the persistent reservation is of any other type, the device
2738          *    server shall not establish a unit attention condition.
2739          */
2740         __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2741                         pr_reg, 1);
2742
2743         spin_unlock(&dev->dev_reservation_lock);
2744
2745         if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2746             (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2747             (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2748             (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2749                 /*
2750                  * If no UNIT ATTENTION conditions will be established for
2751                  * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2752                  * go ahead and check for APTPL=1 update+write below
2753                  */
2754                 goto write_aptpl;
2755         }
2756
2757         spin_lock(&pr_tmpl->registration_lock);
2758         list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2759                         pr_reg_list) {
2760                 /*
2761                  * Do not establish a UNIT ATTENTION condition
2762                  * for the calling I_T Nexus
2763                  */
2764                 if (pr_reg_p == pr_reg)
2765                         continue;
2766
2767                 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2768                                 pr_reg_p->pr_res_mapped_lun,
2769                                 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2770         }
2771         spin_unlock(&pr_tmpl->registration_lock);
2772
2773 write_aptpl:
2774         if (pr_tmpl->pr_aptpl_active) {
2775                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
2776                                 &pr_reg->pr_aptpl_buf[0],
2777                                 pr_tmpl->pr_aptpl_buf_len);
2778                 if (!ret)
2779                         pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2780         }
2781
2782         core_scsi3_put_pr_reg(pr_reg);
2783         return 0;
2784 }
2785
2786 static int core_scsi3_emulate_pro_clear(
2787         struct se_cmd *cmd,
2788         u64 res_key)
2789 {
2790         struct se_device *dev = cmd->se_dev;
2791         struct se_node_acl *pr_reg_nacl;
2792         struct se_session *se_sess = cmd->se_sess;
2793         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2794         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2795         u32 pr_res_mapped_lun = 0;
2796         int calling_it_nexus = 0;
2797         /*
2798          * Locate the existing *pr_reg via struct se_node_acl pointers
2799          */
2800         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2801                         se_sess->se_node_acl, se_sess);
2802         if (!pr_reg_n) {
2803                 pr_err("SPC-3 PR: Unable to locate"
2804                         " PR_REGISTERED *pr_reg for CLEAR\n");
2805                         return PYX_TRANSPORT_LU_COMM_FAILURE;
2806         }
2807         /*
2808          * From spc4r17 section 5.7.11.6, Clearing:
2809          *
2810          * Any application client may release the persistent reservation and
2811          * remove all registrations from a device server by issuing a
2812          * PERSISTENT RESERVE OUT command with CLEAR service action through a
2813          * registered I_T nexus with the following parameter:
2814          *
2815          *      a) RESERVATION KEY field set to the value of the reservation key
2816          *         that is registered with the logical unit for the I_T nexus.
2817          */
2818         if (res_key != pr_reg_n->pr_res_key) {
2819                 pr_err("SPC-3 PR REGISTER: Received"
2820                         " res_key: 0x%016Lx does not match"
2821                         " existing SA REGISTER res_key:"
2822                         " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2823                 core_scsi3_put_pr_reg(pr_reg_n);
2824                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2825         }
2826         /*
2827          * a) Release the persistent reservation, if any;
2828          */
2829         spin_lock(&dev->dev_reservation_lock);
2830         pr_res_holder = dev->dev_pr_res_holder;
2831         if (pr_res_holder) {
2832                 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2833                 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2834                         pr_res_holder, 0);
2835         }
2836         spin_unlock(&dev->dev_reservation_lock);
2837         /*
2838          * b) Remove all registration(s) (see spc4r17 5.7.7);
2839          */
2840         spin_lock(&pr_tmpl->registration_lock);
2841         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2842                         &pr_tmpl->registration_list, pr_reg_list) {
2843
2844                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2845                 pr_reg_nacl = pr_reg->pr_reg_nacl;
2846                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2847                 __core_scsi3_free_registration(dev, pr_reg, NULL,
2848                                         calling_it_nexus);
2849                 /*
2850                  * e) Establish a unit attention condition for the initiator
2851                  *    port associated with every registered I_T nexus other
2852                  *    than the I_T nexus on which the PERSISTENT RESERVE OUT
2853                  *    command with CLEAR service action was received, with the
2854                  *    additional sense code set to RESERVATIONS PREEMPTED.
2855                  */
2856                 if (!calling_it_nexus)
2857                         core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2858                                 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2859         }
2860         spin_unlock(&pr_tmpl->registration_lock);
2861
2862         pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2863                 cmd->se_tfo->get_fabric_name());
2864
2865         if (pr_tmpl->pr_aptpl_active) {
2866                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
2867                 pr_debug("SPC-3 PR: Updated APTPL metadata"
2868                                 " for CLEAR\n");
2869         }
2870
2871         core_scsi3_pr_generation(dev);
2872         return 0;
2873 }
2874
2875 /*
2876  * Called with struct se_device->dev_reservation_lock held.
2877  */
2878 static void __core_scsi3_complete_pro_preempt(
2879         struct se_device *dev,
2880         struct t10_pr_registration *pr_reg,
2881         struct list_head *preempt_and_abort_list,
2882         int type,
2883         int scope,
2884         int abort)
2885 {
2886         struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2887         struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2888         char i_buf[PR_REG_ISID_ID_LEN];
2889         int prf_isid;
2890
2891         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2892         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
2893                                 PR_REG_ISID_ID_LEN);
2894         /*
2895          * Do an implict RELEASE of the existing reservation.
2896          */
2897         if (dev->dev_pr_res_holder)
2898                 __core_scsi3_complete_pro_release(dev, nacl,
2899                                 dev->dev_pr_res_holder, 0);
2900
2901         dev->dev_pr_res_holder = pr_reg;
2902         pr_reg->pr_res_holder = 1;
2903         pr_reg->pr_res_type = type;
2904         pr_reg->pr_res_scope = scope;
2905
2906         pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2907                 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2908                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2909                 core_scsi3_pr_dump_type(type),
2910                 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2911         pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2912                 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
2913                 nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
2914         /*
2915          * For PREEMPT_AND_ABORT, add the preempting reservation's
2916          * struct t10_pr_registration to the list that will be compared
2917          * against received CDBs..
2918          */
2919         if (preempt_and_abort_list)
2920                 list_add_tail(&pr_reg->pr_reg_abort_list,
2921                                 preempt_and_abort_list);
2922 }
2923
2924 static void core_scsi3_release_preempt_and_abort(
2925         struct list_head *preempt_and_abort_list,
2926         struct t10_pr_registration *pr_reg_holder)
2927 {
2928         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2929
2930         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2931                                 pr_reg_abort_list) {
2932
2933                 list_del(&pr_reg->pr_reg_abort_list);
2934                 if (pr_reg_holder == pr_reg)
2935                         continue;
2936                 if (pr_reg->pr_res_holder) {
2937                         pr_warn("pr_reg->pr_res_holder still set\n");
2938                         continue;
2939                 }
2940
2941                 pr_reg->pr_reg_deve = NULL;
2942                 pr_reg->pr_reg_nacl = NULL;
2943                 kfree(pr_reg->pr_aptpl_buf);
2944                 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2945         }
2946 }
2947
2948 int core_scsi3_check_cdb_abort_and_preempt(
2949         struct list_head *preempt_and_abort_list,
2950         struct se_cmd *cmd)
2951 {
2952         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2953
2954         list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2955                                 pr_reg_abort_list) {
2956                 if (pr_reg->pr_res_key == cmd->pr_res_key)
2957                         return 0;
2958         }
2959
2960         return 1;
2961 }
2962
2963 static int core_scsi3_pro_preempt(
2964         struct se_cmd *cmd,
2965         int type,
2966         int scope,
2967         u64 res_key,
2968         u64 sa_res_key,
2969         int abort)
2970 {
2971         struct se_device *dev = cmd->se_dev;
2972         struct se_dev_entry *se_deve;
2973         struct se_node_acl *pr_reg_nacl;
2974         struct se_session *se_sess = cmd->se_sess;
2975         struct list_head preempt_and_abort_list;
2976         struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2977         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
2978         u32 pr_res_mapped_lun = 0;
2979         int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2980         int prh_type = 0, prh_scope = 0, ret;
2981
2982         if (!se_sess)
2983                 return PYX_TRANSPORT_LU_COMM_FAILURE;
2984
2985         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2986         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2987                                 se_sess);
2988         if (!pr_reg_n) {
2989                 pr_err("SPC-3 PR: Unable to locate"
2990                         " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2991                         (abort) ? "_AND_ABORT" : "");
2992                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2993         }
2994         if (pr_reg_n->pr_res_key != res_key) {
2995                 core_scsi3_put_pr_reg(pr_reg_n);
2996                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
2997         }
2998         if (scope != PR_SCOPE_LU_SCOPE) {
2999                 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
3000                 core_scsi3_put_pr_reg(pr_reg_n);
3001                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3002         }
3003         INIT_LIST_HEAD(&preempt_and_abort_list);
3004
3005         spin_lock(&dev->dev_reservation_lock);
3006         pr_res_holder = dev->dev_pr_res_holder;
3007         if (pr_res_holder &&
3008            ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3009             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
3010                 all_reg = 1;
3011
3012         if (!all_reg && !sa_res_key) {
3013                 spin_unlock(&dev->dev_reservation_lock);
3014                 core_scsi3_put_pr_reg(pr_reg_n);
3015                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3016         }
3017         /*
3018          * From spc4r17, section 5.7.11.4.4 Removing Registrations:
3019          *
3020          * If the SERVICE ACTION RESERVATION KEY field does not identify a
3021          * persistent reservation holder or there is no persistent reservation
3022          * holder (i.e., there is no persistent reservation), then the device
3023          * server shall perform a preempt by doing the following in an
3024          * uninterrupted series of actions. (See below..)
3025          */
3026         if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
3027                 /*
3028                  * No existing or SA Reservation Key matching reservations..
3029                  *
3030                  * PROUT SA PREEMPT with All Registrant type reservations are
3031                  * allowed to be processed without a matching SA Reservation Key
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                          * Removing of registrations in non all registrants
3038                          * type reservations without a matching SA reservation
3039                          * key.
3040                          *
3041                          * a) Remove the registrations for all I_T nexuses
3042                          *    specified by the SERVICE ACTION RESERVATION KEY
3043                          *    field;
3044                          * b) Ignore the contents of the SCOPE and TYPE fields;
3045                          * c) Process tasks as defined in 5.7.1; and
3046                          * d) Establish a unit attention condition for the
3047                          *    initiator port associated with every I_T nexus
3048                          *    that lost its registration other than the I_T
3049                          *    nexus on which the PERSISTENT RESERVE OUT command
3050                          *    was received, with the additional sense code set
3051                          *    to REGISTRATIONS PREEMPTED.
3052                          */
3053                         if (!all_reg) {
3054                                 if (pr_reg->pr_res_key != sa_res_key)
3055                                         continue;
3056
3057                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3058                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3059                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3060                                 __core_scsi3_free_registration(dev, pr_reg,
3061                                         (abort) ? &preempt_and_abort_list :
3062                                                 NULL, calling_it_nexus);
3063                                 released_regs++;
3064                         } else {
3065                                 /*
3066                                  * Case for any existing all registrants type
3067                                  * reservation, follow logic in spc4r17 section
3068                                  * 5.7.11.4 Preempting, Table 52 and Figure 7.
3069                                  *
3070                                  * For a ZERO SA Reservation key, release
3071                                  * all other registrations and do an implict
3072                                  * release of active persistent reservation.
3073                                  *
3074                                  * For a non-ZERO SA Reservation key, only
3075                                  * release the matching reservation key from
3076                                  * registrations.
3077                                  */
3078                                 if ((sa_res_key) &&
3079                                      (pr_reg->pr_res_key != sa_res_key))
3080                                         continue;
3081
3082                                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3083                                 if (calling_it_nexus)
3084                                         continue;
3085
3086                                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3087                                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3088                                 __core_scsi3_free_registration(dev, pr_reg,
3089                                         (abort) ? &preempt_and_abort_list :
3090                                                 NULL, 0);
3091                                 released_regs++;
3092                         }
3093                         if (!calling_it_nexus)
3094                                 core_scsi3_ua_allocate(pr_reg_nacl,
3095                                         pr_res_mapped_lun, 0x2A,
3096                                         ASCQ_2AH_RESERVATIONS_PREEMPTED);
3097                 }
3098                 spin_unlock(&pr_tmpl->registration_lock);
3099                 /*
3100                  * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3101                  * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3102                  * RESERVATION KEY field to a value that does not match any
3103                  * registered reservation key, then the device server shall
3104                  * complete the command with RESERVATION CONFLICT status.
3105                  */
3106                 if (!released_regs) {
3107                         spin_unlock(&dev->dev_reservation_lock);
3108                         core_scsi3_put_pr_reg(pr_reg_n);
3109                         return PYX_TRANSPORT_RESERVATION_CONFLICT;
3110                 }
3111                 /*
3112                  * For an existing all registrants type reservation
3113                  * with a zero SA rservation key, preempt the existing
3114                  * reservation with the new PR type and scope.
3115                  */
3116                 if (pr_res_holder && all_reg && !(sa_res_key)) {
3117                         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3118                                 (abort) ? &preempt_and_abort_list : NULL,
3119                                 type, scope, abort);
3120
3121                         if (abort)
3122                                 core_scsi3_release_preempt_and_abort(
3123                                         &preempt_and_abort_list, pr_reg_n);
3124                 }
3125                 spin_unlock(&dev->dev_reservation_lock);
3126
3127                 if (pr_tmpl->pr_aptpl_active) {
3128                         ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3129                                         &pr_reg_n->pr_aptpl_buf[0],
3130                                         pr_tmpl->pr_aptpl_buf_len);
3131                         if (!ret)
3132                                 pr_debug("SPC-3 PR: Updated APTPL"
3133                                         " metadata for  PREEMPT%s\n", (abort) ?
3134                                         "_AND_ABORT" : "");
3135                 }
3136
3137                 core_scsi3_put_pr_reg(pr_reg_n);
3138                 core_scsi3_pr_generation(cmd->se_dev);
3139                 return 0;
3140         }
3141         /*
3142          * The PREEMPTing SA reservation key matches that of the
3143          * existing persistent reservation, first, we check if
3144          * we are preempting our own reservation.
3145          * From spc4r17, section 5.7.11.4.3 Preempting
3146          * persistent reservations and registration handling
3147          *
3148          * If an all registrants persistent reservation is not
3149          * present, it is not an error for the persistent
3150          * reservation holder to preempt itself (i.e., a
3151          * PERSISTENT RESERVE OUT with a PREEMPT service action
3152          * or a PREEMPT AND ABORT service action with the
3153          * SERVICE ACTION RESERVATION KEY value equal to the
3154          * persistent reservation holder's reservation key that
3155          * is received from the persistent reservation holder).
3156          * In that case, the device server shall establish the
3157          * new persistent reservation and maintain the
3158          * registration.
3159          */
3160         prh_type = pr_res_holder->pr_res_type;
3161         prh_scope = pr_res_holder->pr_res_scope;
3162         /*
3163          * If the SERVICE ACTION RESERVATION KEY field identifies a
3164          * persistent reservation holder (see 5.7.10), the device
3165          * server shall perform a preempt by doing the following as
3166          * an uninterrupted series of actions:
3167          *
3168          * a) Release the persistent reservation for the holder
3169          *    identified by the SERVICE ACTION RESERVATION KEY field;
3170          */
3171         if (pr_reg_n != pr_res_holder)
3172                 __core_scsi3_complete_pro_release(dev,
3173                                 pr_res_holder->pr_reg_nacl,
3174                                 dev->dev_pr_res_holder, 0);
3175         /*
3176          * b) Remove the registrations for all I_T nexuses identified
3177          *    by the SERVICE ACTION RESERVATION KEY field, except the
3178          *    I_T nexus that is being used for the PERSISTENT RESERVE
3179          *    OUT command. If an all registrants persistent reservation
3180          *    is present and the SERVICE ACTION RESERVATION KEY field
3181          *    is set to zero, then all registrations shall be removed
3182          *    except for that of the I_T nexus that is being used for
3183          *    the PERSISTENT RESERVE OUT command;
3184          */
3185         spin_lock(&pr_tmpl->registration_lock);
3186         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3187                         &pr_tmpl->registration_list, pr_reg_list) {
3188
3189                 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3190                 if (calling_it_nexus)
3191                         continue;
3192
3193                 if (pr_reg->pr_res_key != sa_res_key)
3194                         continue;
3195
3196                 pr_reg_nacl = pr_reg->pr_reg_nacl;
3197                 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
3198                 __core_scsi3_free_registration(dev, pr_reg,
3199                                 (abort) ? &preempt_and_abort_list : NULL,
3200                                 calling_it_nexus);
3201                 /*
3202                  * e) Establish a unit attention condition for the initiator
3203                  *    port associated with every I_T nexus that lost its
3204                  *    persistent reservation and/or registration, with the
3205                  *    additional sense code set to REGISTRATIONS PREEMPTED;
3206                  */
3207                 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
3208                                 ASCQ_2AH_RESERVATIONS_PREEMPTED);
3209         }
3210         spin_unlock(&pr_tmpl->registration_lock);
3211         /*
3212          * c) Establish a persistent reservation for the preempting
3213          *    I_T nexus using the contents of the SCOPE and TYPE fields;
3214          */
3215         __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
3216                         (abort) ? &preempt_and_abort_list : NULL,
3217                         type, scope, abort);
3218         /*
3219          * d) Process tasks as defined in 5.7.1;
3220          * e) See above..
3221          * f) If the type or scope has changed, then for every I_T nexus
3222          *    whose reservation key was not removed, except for the I_T
3223          *    nexus on which the PERSISTENT RESERVE OUT command was
3224          *    received, the device server shall establish a unit
3225          *    attention condition for the initiator port associated with
3226          *    that I_T nexus, with the additional sense code set to
3227          *    RESERVATIONS RELEASED. If the type or scope have not
3228          *    changed, then no unit attention condition(s) shall be
3229          *    established for this reason.
3230          */
3231         if ((prh_type != type) || (prh_scope != scope)) {
3232                 spin_lock(&pr_tmpl->registration_lock);
3233                 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3234                                 &pr_tmpl->registration_list, pr_reg_list) {
3235
3236                         calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
3237                         if (calling_it_nexus)
3238                                 continue;
3239
3240                         core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
3241                                         pr_reg->pr_res_mapped_lun, 0x2A,
3242                                         ASCQ_2AH_RESERVATIONS_RELEASED);
3243                 }
3244                 spin_unlock(&pr_tmpl->registration_lock);
3245         }
3246         spin_unlock(&dev->dev_reservation_lock);
3247         /*
3248          * Call LUN_RESET logic upon list of struct t10_pr_registration,
3249          * All received CDBs for the matching existing reservation and
3250          * registrations undergo ABORT_TASK logic.
3251          *
3252          * From there, core_scsi3_release_preempt_and_abort() will
3253          * release every registration in the list (which have already
3254          * been removed from the primary pr_reg list), except the
3255          * new persistent reservation holder, the calling Initiator Port.
3256          */
3257         if (abort) {
3258                 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3259                 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3260                                                 pr_reg_n);
3261         }
3262
3263         if (pr_tmpl->pr_aptpl_active) {
3264                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3265                                 &pr_reg_n->pr_aptpl_buf[0],
3266                                 pr_tmpl->pr_aptpl_buf_len);
3267                 if (!ret)
3268                         pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3269                                 "%s\n", (abort) ? "_AND_ABORT" : "");
3270         }
3271
3272         core_scsi3_put_pr_reg(pr_reg_n);
3273         core_scsi3_pr_generation(cmd->se_dev);
3274         return 0;
3275 }
3276
3277 static int core_scsi3_emulate_pro_preempt(
3278         struct se_cmd *cmd,
3279         int type,
3280         int scope,
3281         u64 res_key,
3282         u64 sa_res_key,
3283         int abort)
3284 {
3285         int ret = 0;
3286
3287         switch (type) {
3288         case PR_TYPE_WRITE_EXCLUSIVE:
3289         case PR_TYPE_EXCLUSIVE_ACCESS:
3290         case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3291         case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3292         case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3293         case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3294                 ret = core_scsi3_pro_preempt(cmd, type, scope,
3295                                 res_key, sa_res_key, abort);
3296                 break;
3297         default:
3298                 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3299                         " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
3300                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3301         }
3302
3303         return ret;
3304 }
3305
3306
3307 static int core_scsi3_emulate_pro_register_and_move(
3308         struct se_cmd *cmd,
3309         u64 res_key,
3310         u64 sa_res_key,
3311         int aptpl,
3312         int unreg)
3313 {
3314         struct se_session *se_sess = cmd->se_sess;
3315         struct se_device *dev = cmd->se_dev;
3316         struct se_dev_entry *se_deve, *dest_se_deve = NULL;
3317         struct se_lun *se_lun = cmd->se_lun;
3318         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3319         struct se_port *se_port;
3320         struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3321         struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3322         struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3323         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
3324         unsigned char *buf;
3325         unsigned char *initiator_str;
3326         char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3327         u32 tid_len, tmp_tid_len;
3328         int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
3329         unsigned short rtpi;
3330         unsigned char proto_ident;
3331
3332         if (!se_sess || !se_lun) {
3333                 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3334                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3335         }
3336         memset(dest_iport, 0, 64);
3337         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3338         se_tpg = se_sess->se_tpg;
3339         tf_ops = se_tpg->se_tpg_tfo;
3340         se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
3341         /*
3342          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3343          *      Register behaviors for a REGISTER AND MOVE service action
3344          *
3345          * Locate the existing *pr_reg via struct se_node_acl pointers
3346          */
3347         pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3348                                 se_sess);
3349         if (!pr_reg) {
3350                 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3351                         " *pr_reg for REGISTER_AND_MOVE\n");
3352                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3353         }
3354         /*
3355          * The provided reservation key much match the existing reservation key
3356          * provided during this initiator's I_T nexus registration.
3357          */
3358         if (res_key != pr_reg->pr_res_key) {
3359                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3360                         " res_key: 0x%016Lx does not match existing SA REGISTER"
3361                         " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3362                 core_scsi3_put_pr_reg(pr_reg);
3363                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
3364         }
3365         /*
3366          * The service active reservation key needs to be non zero
3367          */
3368         if (!sa_res_key) {
3369                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3370                         " sa_res_key\n");
3371                 core_scsi3_put_pr_reg(pr_reg);
3372                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3373         }
3374
3375         /*
3376          * Determine the Relative Target Port Identifier where the reservation
3377          * will be moved to for the TransportID containing SCSI initiator WWN
3378          * information.
3379          */
3380         buf = transport_kmap_first_data_page(cmd);
3381         rtpi = (buf[18] & 0xff) << 8;
3382         rtpi |= buf[19] & 0xff;
3383         tid_len = (buf[20] & 0xff) << 24;
3384         tid_len |= (buf[21] & 0xff) << 16;
3385         tid_len |= (buf[22] & 0xff) << 8;
3386         tid_len |= buf[23] & 0xff;
3387         transport_kunmap_first_data_page(cmd);
3388         buf = NULL;
3389
3390         if ((tid_len + 24) != cmd->data_length) {
3391                 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3392                         " does not equal CDB data_length: %u\n", tid_len,
3393                         cmd->data_length);
3394                 core_scsi3_put_pr_reg(pr_reg);
3395                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3396         }
3397
3398         spin_lock(&dev->se_port_lock);
3399         list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3400                 if (se_port->sep_rtpi != rtpi)
3401                         continue;
3402                 dest_se_tpg = se_port->sep_tpg;
3403                 if (!dest_se_tpg)
3404                         continue;
3405                 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3406                 if (!dest_tf_ops)
3407                         continue;
3408
3409                 atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
3410                 smp_mb__after_atomic_inc();
3411                 spin_unlock(&dev->se_port_lock);
3412
3413                 ret = core_scsi3_tpg_depend_item(dest_se_tpg);
3414                 if (ret != 0) {
3415                         pr_err("core_scsi3_tpg_depend_item() failed"
3416                                 " for dest_se_tpg\n");
3417                         atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
3418                         smp_mb__after_atomic_dec();
3419                         core_scsi3_put_pr_reg(pr_reg);
3420                         return PYX_TRANSPORT_LU_COMM_FAILURE;
3421                 }
3422
3423                 spin_lock(&dev->se_port_lock);
3424                 break;
3425         }
3426         spin_unlock(&dev->se_port_lock);
3427
3428         if (!dest_se_tpg || !dest_tf_ops) {
3429                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3430                         " fabric ops from Relative Target Port Identifier:"
3431                         " %hu\n", rtpi);
3432                 core_scsi3_put_pr_reg(pr_reg);
3433                 return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3434         }
3435
3436         buf = transport_kmap_first_data_page(cmd);
3437         proto_ident = (buf[24] & 0x0f);
3438 #if 0
3439         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3440                         " 0x%02x\n", proto_ident);
3441 #endif
3442         if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3443                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3444                         " proto_ident: 0x%02x does not match ident: 0x%02x"
3445                         " from fabric: %s\n", proto_ident,
3446                         dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3447                         dest_tf_ops->get_fabric_name());
3448                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3449                 goto out;
3450         }
3451         if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3452                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3453                         " containg a valid tpg_parse_pr_out_transport_id"
3454                         " function pointer\n");
3455                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3456                 goto out;
3457         }
3458         initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3459                         (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3460         if (!initiator_str) {
3461                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3462                         " initiator_str from Transport ID\n");
3463                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3464                 goto out;
3465         }
3466
3467         transport_kunmap_first_data_page(cmd);
3468         buf = NULL;
3469
3470         pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3471                 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3472                 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3473                 iport_ptr : "");
3474         /*
3475          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3476          * action specifies a TransportID that is the same as the initiator port
3477          * of the I_T nexus for the command received, then the command shall
3478          * be terminated with CHECK CONDITION status, with the sense key set to
3479          * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3480          * IN PARAMETER LIST.
3481          */
3482         pr_reg_nacl = pr_reg->pr_reg_nacl;
3483         matching_iname = (!strcmp(initiator_str,
3484                                   pr_reg_nacl->initiatorname)) ? 1 : 0;
3485         if (!matching_iname)
3486                 goto after_iport_check;
3487
3488         if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3489                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3490                         " matches: %s on received I_T Nexus\n", initiator_str,
3491                         pr_reg_nacl->initiatorname);
3492                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3493                 goto out;
3494         }
3495         if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3496                 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3497                         " matches: %s %s on received I_T Nexus\n",
3498                         initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3499                         pr_reg->pr_reg_isid);
3500                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3501                 goto out;
3502         }
3503 after_iport_check:
3504         /*
3505          * Locate the destination struct se_node_acl from the received Transport ID
3506          */
3507         spin_lock_irq(&dest_se_tpg->acl_node_lock);
3508         dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3509                                 initiator_str);
3510         if (dest_node_acl) {
3511                 atomic_inc(&dest_node_acl->acl_pr_ref_count);
3512                 smp_mb__after_atomic_inc();
3513         }
3514         spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3515
3516         if (!dest_node_acl) {
3517                 pr_err("Unable to locate %s dest_node_acl for"
3518                         " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3519                         initiator_str);
3520                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3521                 goto out;
3522         }
3523         ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
3524         if (ret != 0) {
3525                 pr_err("core_scsi3_nodeacl_depend_item() for"
3526                         " dest_node_acl\n");
3527                 atomic_dec(&dest_node_acl->acl_pr_ref_count);
3528                 smp_mb__after_atomic_dec();
3529                 dest_node_acl = NULL;
3530                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3531                 goto out;
3532         }
3533 #if 0
3534         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3535                 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3536                 dest_node_acl->initiatorname);
3537 #endif
3538         /*
3539          * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3540          * PORT IDENTIFIER.
3541          */
3542         dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3543         if (!dest_se_deve) {
3544                 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3545                         " %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
3546                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3547                 goto out;
3548         }
3549
3550         ret = core_scsi3_lunacl_depend_item(dest_se_deve);
3551         if (ret < 0) {
3552                 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3553                 atomic_dec(&dest_se_deve->pr_ref_count);
3554                 smp_mb__after_atomic_dec();
3555                 dest_se_deve = NULL;
3556                 ret = PYX_TRANSPORT_LU_COMM_FAILURE;
3557                 goto out;
3558         }
3559 #if 0
3560         pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3561                 " ACL for dest_se_deve->mapped_lun: %u\n",
3562                 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3563                 dest_se_deve->mapped_lun);
3564 #endif
3565         /*
3566          * A persistent reservation needs to already existing in order to
3567          * successfully complete the REGISTER_AND_MOVE service action..
3568          */
3569         spin_lock(&dev->dev_reservation_lock);
3570         pr_res_holder = dev->dev_pr_res_holder;
3571         if (!pr_res_holder) {
3572                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3573                         " currently held\n");
3574                 spin_unlock(&dev->dev_reservation_lock);
3575                 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3576                 goto out;
3577         }
3578         /*
3579          * The received on I_T Nexus must be the reservation holder.
3580          *
3581          * From spc4r17 section 5.7.8  Table 50 --
3582          *      Register behaviors for a REGISTER AND MOVE service action
3583          */
3584         if (pr_res_holder != pr_reg) {
3585                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3586                         " Nexus is not reservation holder\n");
3587                 spin_unlock(&dev->dev_reservation_lock);
3588                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3589                 goto out;
3590         }
3591         /*
3592          * From spc4r17 section 5.7.8: registering and moving reservation
3593          *
3594          * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3595          * action is received and the established persistent reservation is a
3596          * Write Exclusive - All Registrants type or Exclusive Access -
3597          * All Registrants type reservation, then the command shall be completed
3598          * with RESERVATION CONFLICT status.
3599          */
3600         if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3601             (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3602                 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3603                         " reservation for type: %s\n",
3604                         core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3605                 spin_unlock(&dev->dev_reservation_lock);
3606                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3607                 goto out;
3608         }
3609         pr_res_nacl = pr_res_holder->pr_reg_nacl;
3610         /*
3611          * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3612          */
3613         type = pr_res_holder->pr_res_type;
3614         scope = pr_res_holder->pr_res_type;
3615         /*
3616          * c) Associate the reservation key specified in the SERVICE ACTION
3617          *    RESERVATION KEY field with the I_T nexus specified as the
3618          *    destination of the register and move, where:
3619          *    A) The I_T nexus is specified by the TransportID and the
3620          *       RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3621          *    B) Regardless of the TransportID format used, the association for
3622          *       the initiator port is based on either the initiator port name
3623          *       (see 3.1.71) on SCSI transport protocols where port names are
3624          *       required or the initiator port identifier (see 3.1.70) on SCSI
3625          *       transport protocols where port names are not required;
3626          * d) Register the reservation key specified in the SERVICE ACTION
3627          *    RESERVATION KEY field;
3628          * e) Retain the reservation key specified in the SERVICE ACTION
3629          *    RESERVATION KEY field and associated information;
3630          *
3631          * Also, It is not an error for a REGISTER AND MOVE service action to
3632          * register an I_T nexus that is already registered with the same
3633          * reservation key or a different reservation key.
3634          */
3635         dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3636                                         iport_ptr);
3637         if (!dest_pr_reg) {
3638                 ret = core_scsi3_alloc_registration(cmd->se_dev,
3639                                 dest_node_acl, dest_se_deve, iport_ptr,
3640                                 sa_res_key, 0, aptpl, 2, 1);
3641                 if (ret != 0) {
3642                         spin_unlock(&dev->dev_reservation_lock);
3643                         ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3644                         goto out;
3645                 }
3646                 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3647                                                 iport_ptr);
3648                 new_reg = 1;
3649         }
3650         /*
3651          * f) Release the persistent reservation for the persistent reservation
3652          *    holder (i.e., the I_T nexus on which the
3653          */
3654         __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3655                         dev->dev_pr_res_holder, 0);
3656         /*
3657          * g) Move the persistent reservation to the specified I_T nexus using
3658          *    the same scope and type as the persistent reservation released in
3659          *    item f); and
3660          */
3661         dev->dev_pr_res_holder = dest_pr_reg;
3662         dest_pr_reg->pr_res_holder = 1;
3663         dest_pr_reg->pr_res_type = type;
3664         pr_reg->pr_res_scope = scope;
3665         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
3666                                 PR_REG_ISID_ID_LEN);
3667         /*
3668          * Increment PRGeneration for existing registrations..
3669          */
3670         if (!new_reg)
3671                 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3672         spin_unlock(&dev->dev_reservation_lock);
3673
3674         pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3675                 " created new reservation holder TYPE: %s on object RTPI:"
3676                 " %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3677                 core_scsi3_pr_dump_type(type), rtpi,
3678                 dest_pr_reg->pr_res_generation);
3679         pr_debug("SPC-3 PR Successfully moved reservation from"
3680                 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3681                 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3682                 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
3683                 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3684                 iport_ptr : "");
3685         /*
3686          * It is now safe to release configfs group dependencies for destination
3687          * of Transport ID Initiator Device/Port Identifier
3688          */
3689         core_scsi3_lunacl_undepend_item(dest_se_deve);
3690         core_scsi3_nodeacl_undepend_item(dest_node_acl);
3691         core_scsi3_tpg_undepend_item(dest_se_tpg);
3692         /*
3693          * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3694          * nexus on which PERSISTENT RESERVE OUT command was received.
3695          */
3696         if (unreg) {
3697                 spin_lock(&pr_tmpl->registration_lock);
3698                 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3699                 spin_unlock(&pr_tmpl->registration_lock);
3700         } else
3701                 core_scsi3_put_pr_reg(pr_reg);
3702
3703         /*
3704          * Clear the APTPL metadata if APTPL has been disabled, otherwise
3705          * write out the updated metadata to struct file for this SCSI device.
3706          */
3707         if (!aptpl) {
3708                 pr_tmpl->pr_aptpl_active = 0;
3709                 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
3710                 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3711                                 " REGISTER_AND_MOVE\n");
3712         } else {
3713                 pr_tmpl->pr_aptpl_active = 1;
3714                 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
3715                                 &dest_pr_reg->pr_aptpl_buf[0],
3716                                 pr_tmpl->pr_aptpl_buf_len);
3717                 if (!ret)
3718                         pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3719                                         " REGISTER_AND_MOVE\n");
3720         }
3721
3722         transport_kunmap_first_data_page(cmd);
3723
3724         core_scsi3_put_pr_reg(dest_pr_reg);
3725         return 0;
3726 out:
3727         if (buf)
3728                 transport_kunmap_first_data_page(cmd);
3729         if (dest_se_deve)
3730                 core_scsi3_lunacl_undepend_item(dest_se_deve);
3731         if (dest_node_acl)
3732                 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3733         core_scsi3_tpg_undepend_item(dest_se_tpg);
3734         core_scsi3_put_pr_reg(pr_reg);
3735         return ret;
3736 }
3737
3738 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3739 {
3740         unsigned int __v1, __v2;
3741
3742         __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3743         __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3744
3745         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3746 }
3747
3748 /*
3749  * See spc4r17 section 6.14 Table 170
3750  */
3751 int target_scsi3_emulate_pr_out(struct se_task *task)
3752 {
3753         struct se_cmd *cmd = task->task_se_cmd;
3754         unsigned char *cdb = &cmd->t_task_cdb[0];
3755         unsigned char *buf;
3756         u64 res_key, sa_res_key;
3757         int sa, scope, type, aptpl;
3758         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3759         int ret;
3760
3761         /*
3762          * Following spc2r20 5.5.1 Reservations overview:
3763          *
3764          * If a logical unit has been reserved by any RESERVE command and is
3765          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3766          * PERSISTENT RESERVE OUT commands shall conflict regardless of
3767          * initiator or service action and shall terminate with a RESERVATION
3768          * CONFLICT status.
3769          */
3770         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
3771                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3772                         " SPC-2 reservation is held, returning"
3773                         " RESERVATION_CONFLICT\n");
3774                 ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
3775                 goto out;
3776         }
3777
3778         /*
3779          * FIXME: A NULL struct se_session pointer means an this is not coming from
3780          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3781          */
3782         if (!cmd->se_sess)
3783                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3784
3785         if (cmd->data_length < 24) {
3786                 pr_warn("SPC-PR: Received PR OUT parameter list"
3787                         " length too small: %u\n", cmd->data_length);
3788                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3789                 goto out;
3790         }
3791         /*
3792          * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3793          */
3794         sa = (cdb[1] & 0x1f);
3795         scope = (cdb[2] & 0xf0);
3796         type = (cdb[2] & 0x0f);
3797
3798         buf = transport_kmap_first_data_page(cmd);
3799         /*
3800          * From PERSISTENT_RESERVE_OUT parameter list (payload)
3801          */
3802         res_key = core_scsi3_extract_reservation_key(&buf[0]);
3803         sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3804         /*
3805          * REGISTER_AND_MOVE uses a different SA parameter list containing
3806          * SCSI TransportIDs.
3807          */
3808         if (sa != PRO_REGISTER_AND_MOVE) {
3809                 spec_i_pt = (buf[20] & 0x08);
3810                 all_tg_pt = (buf[20] & 0x04);
3811                 aptpl = (buf[20] & 0x01);
3812         } else {
3813                 aptpl = (buf[17] & 0x01);
3814                 unreg = (buf[17] & 0x02);
3815         }
3816         transport_kunmap_first_data_page(cmd);
3817         buf = NULL;
3818
3819         /*
3820          * SPEC_I_PT=1 is only valid for Service action: REGISTER
3821          */
3822         if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
3823                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3824                 goto out;
3825         }
3826
3827         /*
3828          * From spc4r17 section 6.14:
3829          *
3830          * If the SPEC_I_PT bit is set to zero, the service action is not
3831          * REGISTER AND MOVE, and the parameter list length is not 24, then
3832          * the command shall be terminated with CHECK CONDITION status, with
3833          * the sense key set to ILLEGAL REQUEST, and the additional sense
3834          * code set to PARAMETER LIST LENGTH ERROR.
3835          */
3836         if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3837             (cmd->data_length != 24)) {
3838                 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3839                         " list length: %u\n", cmd->data_length);
3840                 ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
3841                 goto out;
3842         }
3843         /*
3844          * (core_scsi3_emulate_pro_* function parameters
3845          * are defined by spc4r17 Table 174:
3846          * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3847          */
3848         switch (sa) {
3849         case PRO_REGISTER:
3850                 ret = core_scsi3_emulate_pro_register(cmd,
3851                         res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
3852                 break;
3853         case PRO_RESERVE:
3854                 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3855                 break;
3856         case PRO_RELEASE:
3857                 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3858                 break;
3859         case PRO_CLEAR:
3860                 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3861                 break;
3862         case PRO_PREEMPT:
3863                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3864                                         res_key, sa_res_key, 0);
3865                 break;
3866         case PRO_PREEMPT_AND_ABORT:
3867                 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3868                                         res_key, sa_res_key, 1);
3869                 break;
3870         case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3871                 ret = core_scsi3_emulate_pro_register(cmd,
3872                         0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
3873                 break;
3874         case PRO_REGISTER_AND_MOVE:
3875                 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3876                                 sa_res_key, aptpl, unreg);
3877                 break;
3878         default:
3879                 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3880                         " action: 0x%02x\n", cdb[1] & 0x1f);
3881                 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
3882                 break;
3883         }
3884
3885 out:
3886         if (!ret) {
3887                 task->task_scsi_status = GOOD;
3888                 transport_complete_task(task, 1);
3889         }
3890         return ret;
3891 }
3892
3893 /*
3894  * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3895  *
3896  * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3897  */
3898 static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
3899 {
3900         struct se_device *se_dev = cmd->se_dev;
3901         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3902         struct t10_pr_registration *pr_reg;
3903         unsigned char *buf;
3904         u32 add_len = 0, off = 8;
3905
3906         if (cmd->data_length < 8) {
3907                 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3908                         " too small\n", cmd->data_length);
3909                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3910         }
3911
3912         buf = transport_kmap_first_data_page(cmd);
3913         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3914         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3915         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3916         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3917
3918         spin_lock(&su_dev->t10_pr.registration_lock);
3919         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
3920                         pr_reg_list) {
3921                 /*
3922                  * Check for overflow of 8byte PRI READ_KEYS payload and
3923                  * next reservation key list descriptor.
3924                  */
3925                 if ((add_len + 8) > (cmd->data_length - 8))
3926                         break;
3927
3928                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3929                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3930                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3931                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3932                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3933                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3934                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3935                 buf[off++] = (pr_reg->pr_res_key & 0xff);
3936
3937                 add_len += 8;
3938         }
3939         spin_unlock(&su_dev->t10_pr.registration_lock);
3940
3941         buf[4] = ((add_len >> 24) & 0xff);
3942         buf[5] = ((add_len >> 16) & 0xff);
3943         buf[6] = ((add_len >> 8) & 0xff);
3944         buf[7] = (add_len & 0xff);
3945
3946         transport_kunmap_first_data_page(cmd);
3947
3948         return 0;
3949 }
3950
3951 /*
3952  * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3953  *
3954  * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3955  */
3956 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3957 {
3958         struct se_device *se_dev = cmd->se_dev;
3959         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
3960         struct t10_pr_registration *pr_reg;
3961         unsigned char *buf;
3962         u64 pr_res_key;
3963         u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3964
3965         if (cmd->data_length < 8) {
3966                 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3967                         " too small\n", cmd->data_length);
3968                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
3969         }
3970
3971         buf = transport_kmap_first_data_page(cmd);
3972         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
3973         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
3974         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
3975         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
3976
3977         spin_lock(&se_dev->dev_reservation_lock);
3978         pr_reg = se_dev->dev_pr_res_holder;
3979         if ((pr_reg)) {
3980                 /*
3981                  * Set the hardcoded Additional Length
3982                  */
3983                 buf[4] = ((add_len >> 24) & 0xff);
3984                 buf[5] = ((add_len >> 16) & 0xff);
3985                 buf[6] = ((add_len >> 8) & 0xff);
3986                 buf[7] = (add_len & 0xff);
3987
3988                 if (cmd->data_length < 22)
3989                         goto err;
3990
3991                 /*
3992                  * Set the Reservation key.
3993                  *
3994                  * From spc4r17, section 5.7.10:
3995                  * A persistent reservation holder has its reservation key
3996                  * returned in the parameter data from a PERSISTENT
3997                  * RESERVE IN command with READ RESERVATION service action as
3998                  * follows:
3999                  * a) For a persistent reservation of the type Write Exclusive
4000                  *    - All Registrants or Exclusive Access  All Regitrants,
4001                  *      the reservation key shall be set to zero; or
4002                  * b) For all other persistent reservation types, the
4003                  *    reservation key shall be set to the registered
4004                  *    reservation key for the I_T nexus that holds the
4005                  *    persistent reservation.
4006                  */
4007                 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
4008                     (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
4009                         pr_res_key = 0;
4010                 else
4011                         pr_res_key = pr_reg->pr_res_key;
4012
4013                 buf[8] = ((pr_res_key >> 56) & 0xff);
4014                 buf[9] = ((pr_res_key >> 48) & 0xff);
4015                 buf[10] = ((pr_res_key >> 40) & 0xff);
4016                 buf[11] = ((pr_res_key >> 32) & 0xff);
4017                 buf[12] = ((pr_res_key >> 24) & 0xff);
4018                 buf[13] = ((pr_res_key >> 16) & 0xff);
4019                 buf[14] = ((pr_res_key >> 8) & 0xff);
4020                 buf[15] = (pr_res_key & 0xff);
4021                 /*
4022                  * Set the SCOPE and TYPE
4023                  */
4024                 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
4025                           (pr_reg->pr_res_type & 0x0f);
4026         }
4027
4028 err:
4029         spin_unlock(&se_dev->dev_reservation_lock);
4030         transport_kunmap_first_data_page(cmd);
4031
4032         return 0;
4033 }
4034
4035 /*
4036  * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
4037  *
4038  * See spc4r17 section 6.13.4 Table 165
4039  */
4040 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
4041 {
4042         struct se_device *dev = cmd->se_dev;
4043         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
4044         unsigned char *buf;
4045         u16 add_len = 8; /* Hardcoded to 8. */
4046
4047         if (cmd->data_length < 6) {
4048                 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
4049                         " %u too small\n", cmd->data_length);
4050                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4051         }
4052
4053         buf = transport_kmap_first_data_page(cmd);
4054
4055         buf[0] = ((add_len << 8) & 0xff);
4056         buf[1] = (add_len & 0xff);
4057         buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
4058         buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
4059         buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
4060         buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
4061         /*
4062          * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
4063          * set the TMV: Task Mask Valid bit.
4064          */
4065         buf[3] |= 0x80;
4066         /*
4067          * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
4068          */
4069         buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
4070         /*
4071          * PTPL_A: Persistence across Target Power Loss Active bit
4072          */
4073         if (pr_tmpl->pr_aptpl_active)
4074                 buf[3] |= 0x01;
4075         /*
4076          * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
4077          */
4078         buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4079         buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
4080         buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
4081         buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
4082         buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
4083         buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
4084
4085         transport_kunmap_first_data_page(cmd);
4086
4087         return 0;
4088 }
4089
4090 /*
4091  * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
4092  *
4093  * See spc4r17 section 6.13.5 Table 168 and 169
4094  */
4095 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
4096 {
4097         struct se_device *se_dev = cmd->se_dev;
4098         struct se_node_acl *se_nacl;
4099         struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
4100         struct se_portal_group *se_tpg;
4101         struct t10_pr_registration *pr_reg, *pr_reg_tmp;
4102         struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
4103         unsigned char *buf;
4104         u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
4105         u32 off = 8; /* off into first Full Status descriptor */
4106         int format_code = 0;
4107
4108         if (cmd->data_length < 8) {
4109                 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4110                         " too small\n", cmd->data_length);
4111                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
4112         }
4113
4114         buf = transport_kmap_first_data_page(cmd);
4115
4116         buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
4117         buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
4118         buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
4119         buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
4120
4121         spin_lock(&pr_tmpl->registration_lock);
4122         list_for_each_entry_safe(pr_reg, pr_reg_tmp,
4123                         &pr_tmpl->registration_list, pr_reg_list) {
4124
4125                 se_nacl = pr_reg->pr_reg_nacl;
4126                 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
4127                 add_desc_len = 0;
4128
4129                 atomic_inc(&pr_reg->pr_res_holders);
4130                 smp_mb__after_atomic_inc();
4131                 spin_unlock(&pr_tmpl->registration_lock);
4132                 /*
4133                  * Determine expected length of $FABRIC_MOD specific
4134                  * TransportID full status descriptor..
4135                  */
4136                 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
4137                                 se_tpg, se_nacl, pr_reg, &format_code);
4138
4139                 if ((exp_desc_len + add_len) > cmd->data_length) {
4140                         pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4141                                 " out of buffer: %d\n", cmd->data_length);
4142                         spin_lock(&pr_tmpl->registration_lock);
4143                         atomic_dec(&pr_reg->pr_res_holders);
4144                         smp_mb__after_atomic_dec();
4145                         break;
4146                 }
4147                 /*
4148                  * Set RESERVATION KEY
4149                  */
4150                 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
4151                 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
4152                 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
4153                 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
4154                 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
4155                 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
4156                 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
4157                 buf[off++] = (pr_reg->pr_res_key & 0xff);
4158                 off += 4; /* Skip Over Reserved area */
4159
4160                 /*
4161                  * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4162                  */
4163                 if (pr_reg->pr_reg_all_tg_pt)
4164                         buf[off] = 0x02;
4165                 /*
4166                  * The struct se_lun pointer will be present for the
4167                  * reservation holder for PR_HOLDER bit.
4168                  *
4169                  * Also, if this registration is the reservation
4170                  * holder, fill in SCOPE and TYPE in the next byte.
4171                  */
4172                 if (pr_reg->pr_res_holder) {
4173                         buf[off++] |= 0x01;
4174                         buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
4175                                      (pr_reg->pr_res_type & 0x0f);
4176                 } else
4177                         off += 2;
4178
4179                 off += 4; /* Skip over reserved area */
4180                 /*
4181                  * From spc4r17 6.3.15:
4182                  *
4183                  * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4184                  * IDENTIFIER field contains the relative port identifier (see
4185                  * 3.1.120) of the target port that is part of the I_T nexus
4186                  * described by this full status descriptor. If the ALL_TG_PT
4187                  * bit is set to one, the contents of the RELATIVE TARGET PORT
4188                  * IDENTIFIER field are not defined by this standard.
4189                  */
4190                 if (!pr_reg->pr_reg_all_tg_pt) {
4191                         struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
4192
4193                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
4194                         buf[off++] = (port->sep_rtpi & 0xff);
4195                 } else
4196                         off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
4197
4198                 /*
4199                  * Now, have the $FABRIC_MOD fill in the protocol identifier
4200                  */
4201                 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
4202                                 se_nacl, pr_reg, &format_code, &buf[off+4]);
4203
4204                 spin_lock(&pr_tmpl->registration_lock);
4205                 atomic_dec(&pr_reg->pr_res_holders);
4206                 smp_mb__after_atomic_dec();
4207                 /*
4208                  * Set the ADDITIONAL DESCRIPTOR LENGTH
4209                  */
4210                 buf[off++] = ((desc_len >> 24) & 0xff);
4211                 buf[off++] = ((desc_len >> 16) & 0xff);
4212                 buf[off++] = ((desc_len >> 8) & 0xff);
4213                 buf[off++] = (desc_len & 0xff);
4214                 /*
4215                  * Size of full desctipor header minus TransportID
4216                  * containing $FABRIC_MOD specific) initiator device/port
4217                  * WWN information.
4218                  *
4219                  *  See spc4r17 Section 6.13.5 Table 169
4220                  */
4221                 add_desc_len = (24 + desc_len);
4222
4223                 off += desc_len;
4224                 add_len += add_desc_len;
4225         }
4226         spin_unlock(&pr_tmpl->registration_lock);
4227         /*
4228          * Set ADDITIONAL_LENGTH
4229          */
4230         buf[4] = ((add_len >> 24) & 0xff);
4231         buf[5] = ((add_len >> 16) & 0xff);
4232         buf[6] = ((add_len >> 8) & 0xff);
4233         buf[7] = (add_len & 0xff);
4234
4235         transport_kunmap_first_data_page(cmd);
4236
4237         return 0;
4238 }
4239
4240 int target_scsi3_emulate_pr_in(struct se_task *task)
4241 {
4242         struct se_cmd *cmd = task->task_se_cmd;
4243         int ret;
4244
4245         /*
4246          * Following spc2r20 5.5.1 Reservations overview:
4247          *
4248          * If a logical unit has been reserved by any RESERVE command and is
4249          * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4250          * PERSISTENT RESERVE OUT commands shall conflict regardless of
4251          * initiator or service action and shall terminate with a RESERVATION
4252          * CONFLICT status.
4253          */
4254         if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
4255                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4256                         " SPC-2 reservation is held, returning"
4257                         " RESERVATION_CONFLICT\n");
4258                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
4259         }
4260
4261         switch (cmd->t_task_cdb[1] & 0x1f) {
4262         case PRI_READ_KEYS:
4263                 ret = core_scsi3_pri_read_keys(cmd);
4264                 break;
4265         case PRI_READ_RESERVATION:
4266                 ret = core_scsi3_pri_read_reservation(cmd);
4267                 break;
4268         case PRI_REPORT_CAPABILITIES:
4269                 ret = core_scsi3_pri_report_capabilities(cmd);
4270                 break;
4271         case PRI_READ_FULL_STATUS:
4272                 ret = core_scsi3_pri_read_full_status(cmd);
4273                 break;
4274         default:
4275                 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4276                         " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4277                 ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
4278                 break;
4279         }
4280
4281         if (!ret) {
4282                 task->task_scsi_status = GOOD;
4283                 transport_complete_task(task, 1);
4284         }
4285         return ret;
4286 }
4287
4288 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
4289 {
4290         return 0;
4291 }
4292
4293 static int core_pt_seq_non_holder(
4294         struct se_cmd *cmd,
4295         unsigned char *cdb,
4296         u32 pr_reg_type)
4297 {
4298         return 0;
4299 }
4300
4301 int core_setup_reservations(struct se_device *dev, int force_pt)
4302 {
4303         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
4304         struct t10_reservation *rest = &su_dev->t10_pr;
4305         /*
4306          * If this device is from Target_Core_Mod/pSCSI, use the reservations
4307          * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
4308          * cause a problem because libata and some SATA RAID HBAs appear
4309          * under Linux/SCSI, but to emulate reservations themselves.
4310          */
4311         if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
4312             !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
4313                 rest->res_type = SPC_PASSTHROUGH;
4314                 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
4315                 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
4316                 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
4317                         " emulation\n", dev->transport->name);
4318                 return 0;
4319         }
4320         /*
4321          * If SPC-3 or above is reported by real or emulated struct se_device,
4322          * use emulated Persistent Reservations.
4323          */
4324         if (dev->transport->get_device_rev(dev) >= SCSI_3) {
4325                 rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
4326                 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
4327                 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
4328                 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
4329                         " emulation\n", dev->transport->name);
4330         } else {
4331                 rest->res_type = SPC2_RESERVATIONS;
4332                 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
4333                 rest->pr_ops.t10_seq_non_holder =
4334                                 &core_scsi2_reservation_seq_non_holder;
4335                 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
4336                         dev->transport->name);
4337         }
4338
4339         return 0;
4340 }