drivers/target/target_core_alua.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_alua.c
   4  *
   5  * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
   6  *
   7  * (c) Copyright 2009-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  ******************************************************************************/
  12
  13 #include <linux/slab.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/configfs.h>
  16 #include <linux/delay.h>
  17 #include <linux/export.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/file.h>
  20 #include <linux/fs.h>
  21 #include <scsi/scsi_proto.h>
  22 #include <asm/unaligned.h>
  23
  24 #include <target/target_core_base.h>
  25 #include <target/target_core_backend.h>
  26 #include <target/target_core_fabric.h>
  27
  28 #include "target_core_internal.h"
  29 #include "target_core_alua.h"
  30 #include "target_core_ua.h"
  31
  32 static sense_reason_t core_alua_check_transition(int state, int valid,
  33                                                  int *primary, int explicit);
  34 static int core_alua_set_tg_pt_secondary_state(
  35                 struct se_lun *lun, int explicit, int offline);
  36
  37 static char *core_alua_dump_state(int state);
  38
  39 static void __target_attach_tg_pt_gp(struct se_lun *lun,
  40                 struct t10_alua_tg_pt_gp *tg_pt_gp);
  41
  42 static u16 alua_lu_gps_counter;
  43 static u32 alua_lu_gps_count;
  44
  45 static DEFINE_SPINLOCK(lu_gps_lock);
  46 static LIST_HEAD(lu_gps_list);
  47
  48 struct t10_alua_lu_gp *default_lu_gp;
  49
  50 /*
  51  * REPORT REFERRALS
  52  *
  53  * See sbc3r35 section 5.23
  54  */
  55 sense_reason_t
  56 target_emulate_report_referrals(struct se_cmd *cmd)
  57 {
  58         struct se_device *dev = cmd->se_dev;
  59         struct t10_alua_lba_map *map;
  60         struct t10_alua_lba_map_member *map_mem;
  61         unsigned char *buf;
  62         u32 rd_len = 0, off;
  63
  64         if (cmd->data_length < 4) {
  65                 pr_warn("REPORT REFERRALS allocation length %u too"
  66                         " small\n", cmd->data_length);
  67                 return TCM_INVALID_CDB_FIELD;
  68         }
  69
  70         buf = transport_kmap_data_sg(cmd);
  71         if (!buf)
  72                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  73
  74         off = 4;
  75         spin_lock(&dev->t10_alua.lba_map_lock);
  76         if (list_empty(&dev->t10_alua.lba_map_list)) {
  77                 spin_unlock(&dev->t10_alua.lba_map_lock);
  78                 transport_kunmap_data_sg(cmd);
  79
  80                 return TCM_UNSUPPORTED_SCSI_OPCODE;
  81         }
  82
  83         list_for_each_entry(map, &dev->t10_alua.lba_map_list,
  84                             lba_map_list) {
  85                 int desc_num = off + 3;
  86                 int pg_num;
  87
  88                 off += 4;
  89                 if (cmd->data_length > off)
  90                         put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
  91                 off += 8;
  92                 if (cmd->data_length > off)
  93                         put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
  94                 off += 8;
  95                 rd_len += 20;
  96                 pg_num = 0;
  97                 list_for_each_entry(map_mem, &map->lba_map_mem_list,
  98                                     lba_map_mem_list) {
  99                         int alua_state = map_mem->lba_map_mem_alua_state;
 100                         int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
 101
 102                         if (cmd->data_length > off)
 103                                 buf[off] = alua_state & 0x0f;
 104                         off += 2;
 105                         if (cmd->data_length > off)
 106                                 buf[off] = (alua_pg_id >> 8) & 0xff;
 107                         off++;
 108                         if (cmd->data_length > off)
 109                                 buf[off] = (alua_pg_id & 0xff);
 110                         off++;
 111                         rd_len += 4;
 112                         pg_num++;
 113                 }
 114                 if (cmd->data_length > desc_num)
 115                         buf[desc_num] = pg_num;
 116         }
 117         spin_unlock(&dev->t10_alua.lba_map_lock);
 118
 119         /*
 120          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 121          */
 122         put_unaligned_be16(rd_len, &buf[2]);
 123
 124         transport_kunmap_data_sg(cmd);
 125
 126         target_complete_cmd(cmd, SAM_STAT_GOOD);
 127         return 0;
 128 }
 129
 130 /*
 131  * REPORT_TARGET_PORT_GROUPS
 132  *
 133  * See spc4r17 section 6.27
 134  */
 135 sense_reason_t
 136 target_emulate_report_target_port_groups(struct se_cmd *cmd)
 137 {
 138         struct se_device *dev = cmd->se_dev;
 139         struct t10_alua_tg_pt_gp *tg_pt_gp;
 140         struct se_lun *lun;
 141         unsigned char *buf;
 142         u32 rd_len = 0, off;
 143         int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
 144
 145         /*
 146          * Skip over RESERVED area to first Target port group descriptor
 147          * depending on the PARAMETER DATA FORMAT type..
 148          */
 149         if (ext_hdr != 0)
 150                 off = 8;
 151         else
 152                 off = 4;
 153
 154         if (cmd->data_length < off) {
 155                 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
 156                         " small for %s header\n", cmd->data_length,
 157                         (ext_hdr) ? "extended" : "normal");
 158                 return TCM_INVALID_CDB_FIELD;
 159         }
 160         buf = transport_kmap_data_sg(cmd);
 161         if (!buf)
 162                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 163
 164         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 165         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
 166                         tg_pt_gp_list) {
 167                 /* Skip empty port groups */
 168                 if (!tg_pt_gp->tg_pt_gp_members)
 169                         continue;
 170                 /*
 171                  * Check if the Target port group and Target port descriptor list
 172                  * based on tg_pt_gp_members count will fit into the response payload.
 173                  * Otherwise, bump rd_len to let the initiator know we have exceeded
 174                  * the allocation length and the response is truncated.
 175                  */
 176                 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
 177                      cmd->data_length) {
 178                         rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
 179                         continue;
 180                 }
 181                 /*
 182                  * PREF: Preferred target port bit, determine if this
 183                  * bit should be set for port group.
 184                  */
 185                 if (tg_pt_gp->tg_pt_gp_pref)
 186                         buf[off] = 0x80;
 187                 /*
 188                  * Set the ASYMMETRIC ACCESS State
 189                  */
 190                 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
 191                 /*
 192                  * Set supported ASYMMETRIC ACCESS State bits
 193                  */
 194                 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
 195                 /*
 196                  * TARGET PORT GROUP
 197                  */
 198                 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
 199                 off += 2;
 200
 201                 off++; /* Skip over Reserved */
 202                 /*
 203                  * STATUS CODE
 204                  */
 205                 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
 206                 /*
 207                  * Vendor Specific field
 208                  */
 209                 buf[off++] = 0x00;
 210                 /*
 211                  * TARGET PORT COUNT
 212                  */
 213                 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
 214                 rd_len += 8;
 215
 216                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 217                 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
 218                                 lun_tg_pt_gp_link) {
 219                         /*
 220                          * Start Target Port descriptor format
 221                          *
 222                          * See spc4r17 section 6.2.7 Table 247
 223                          */
 224                         off += 2; /* Skip over Obsolete */
 225                         /*
 226                          * Set RELATIVE TARGET PORT IDENTIFIER
 227                          */
 228                         put_unaligned_be16(lun->lun_tpg->tpg_rtpi, &buf[off]);
 229                         off += 2;
 230                         rd_len += 4;
 231                 }
 232                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 233         }
 234         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 235         /*
 236          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 237          */
 238         put_unaligned_be32(rd_len, &buf[0]);
 239
 240         /*
 241          * Fill in the Extended header parameter data format if requested
 242          */
 243         if (ext_hdr != 0) {
 244                 buf[4] = 0x10;
 245                 /*
 246                  * Set the implicit transition time (in seconds) for the application
 247                  * client to use as a base for it's transition timeout value.
 248                  *
 249                  * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
 250                  * this CDB was received upon to determine this value individually
 251                  * for ALUA target port group.
 252                  */
 253                 rcu_read_lock();
 254                 tg_pt_gp = rcu_dereference(cmd->se_lun->lun_tg_pt_gp);
 255                 if (tg_pt_gp)
 256                         buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
 257                 rcu_read_unlock();
 258         }
 259         transport_kunmap_data_sg(cmd);
 260
 261         target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4);
 262         return 0;
 263 }
 264
 265 /*
 266  * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
 267  *
 268  * See spc4r17 section 6.35
 269  */
 270 sense_reason_t
 271 target_emulate_set_target_port_groups(struct se_cmd *cmd)
 272 {
 273         struct se_device *dev = cmd->se_dev;
 274         struct se_lun *l_lun = cmd->se_lun;
 275         struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
 276         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
 277         unsigned char *buf;
 278         unsigned char *ptr;
 279         sense_reason_t rc = TCM_NO_SENSE;
 280         u32 len = 4; /* Skip over RESERVED area in header */
 281         int alua_access_state, primary = 0, valid_states;
 282         u16 tg_pt_id, rtpi;
 283
 284         if (cmd->data_length < 4) {
 285                 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
 286                         " small\n", cmd->data_length);
 287                 return TCM_INVALID_PARAMETER_LIST;
 288         }
 289
 290         buf = transport_kmap_data_sg(cmd);
 291         if (!buf)
 292                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 293
 294         /*
 295          * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
 296          * for the local tg_pt_gp.
 297          */
 298         rcu_read_lock();
 299         l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp);
 300         if (!l_tg_pt_gp) {
 301                 rcu_read_unlock();
 302                 pr_err("Unable to access l_lun->tg_pt_gp\n");
 303                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 304                 goto out;
 305         }
 306
 307         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
 308                 rcu_read_unlock();
 309                 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
 310                                 " while TPGS_EXPLICIT_ALUA is disabled\n");
 311                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 312                 goto out;
 313         }
 314         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
 315         rcu_read_unlock();
 316
 317         ptr = &buf[4]; /* Skip over RESERVED area in header */
 318
 319         while (len < cmd->data_length) {
 320                 bool found = false;
 321                 alua_access_state = (ptr[0] & 0x0f);
 322                 /*
 323                  * Check the received ALUA access state, and determine if
 324                  * the state is a primary or secondary target port asymmetric
 325                  * access state.
 326                  */
 327                 rc = core_alua_check_transition(alua_access_state, valid_states,
 328                                                 &primary, 1);
 329                 if (rc) {
 330                         /*
 331                          * If the SET TARGET PORT GROUPS attempts to establish
 332                          * an invalid combination of target port asymmetric
 333                          * access states or attempts to establish an
 334                          * unsupported target port asymmetric access state,
 335                          * then the command shall be terminated with CHECK
 336                          * CONDITION status, with the sense key set to ILLEGAL
 337                          * REQUEST, and the additional sense code set to INVALID
 338                          * FIELD IN PARAMETER LIST.
 339                          */
 340                         goto out;
 341                 }
 342
 343                 /*
 344                  * If the ASYMMETRIC ACCESS STATE field (see table 267)
 345                  * specifies a primary target port asymmetric access state,
 346                  * then the TARGET PORT GROUP OR TARGET PORT field specifies
 347                  * a primary target port group for which the primary target
 348                  * port asymmetric access state shall be changed. If the
 349                  * ASYMMETRIC ACCESS STATE field specifies a secondary target
 350                  * port asymmetric access state, then the TARGET PORT GROUP OR
 351                  * TARGET PORT field specifies the relative target port
 352                  * identifier (see 3.1.120) of the target port for which the
 353                  * secondary target port asymmetric access state shall be
 354                  * changed.
 355                  */
 356                 if (primary) {
 357                         tg_pt_id = get_unaligned_be16(ptr + 2);
 358                         /*
 359                          * Locate the matching target port group ID from
 360                          * the global tg_pt_gp list
 361                          */
 362                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 363                         list_for_each_entry(tg_pt_gp,
 364                                         &dev->t10_alua.tg_pt_gps_list,
 365                                         tg_pt_gp_list) {
 366                                 if (!tg_pt_gp->tg_pt_gp_valid_id)
 367                                         continue;
 368
 369                                 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
 370                                         continue;
 371
 372                                 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 373
 374                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 375
 376                                 if (!core_alua_do_port_transition(tg_pt_gp,
 377                                                 dev, l_lun, nacl,
 378                                                 alua_access_state, 1))
 379                                         found = true;
 380
 381                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 382                                 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 383                                 break;
 384                         }
 385                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 386                 } else {
 387                         struct se_lun *lun;
 388
 389                         /*
 390                          * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
 391                          * the Target Port in question for the incoming
 392                          * SET_TARGET_PORT_GROUPS op.
 393                          */
 394                         rtpi = get_unaligned_be16(ptr + 2);
 395                         /*
 396                          * Locate the matching relative target port identifier
 397                          * for the struct se_device storage object.
 398                          */
 399                         spin_lock(&dev->se_port_lock);
 400                         list_for_each_entry(lun, &dev->dev_sep_list,
 401                                                         lun_dev_link) {
 402                                 if (lun->lun_tpg->tpg_rtpi != rtpi)
 403                                         continue;
 404
 405                                 // XXX: racy unlock
 406                                 spin_unlock(&dev->se_port_lock);
 407
 408                                 if (!core_alua_set_tg_pt_secondary_state(
 409                                                 lun, 1, 1))
 410                                         found = true;
 411
 412                                 spin_lock(&dev->se_port_lock);
 413                                 break;
 414                         }
 415                         spin_unlock(&dev->se_port_lock);
 416                 }
 417
 418                 if (!found) {
 419                         rc = TCM_INVALID_PARAMETER_LIST;
 420                         goto out;
 421                 }
 422
 423                 ptr += 4;
 424                 len += 4;
 425         }
 426
 427 out:
 428         transport_kunmap_data_sg(cmd);
 429         if (!rc)
 430                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 431         return rc;
 432 }
 433
 434 static inline void core_alua_state_nonoptimized(
 435         struct se_cmd *cmd,
 436         unsigned char *cdb,
 437         int nonop_delay_msecs)
 438 {
 439         /*
 440          * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
 441          * later to determine if processing of this cmd needs to be
 442          * temporarily delayed for the Active/NonOptimized primary access state.
 443          */
 444         cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
 445         cmd->alua_nonop_delay = nonop_delay_msecs;
 446 }
 447
 448 static inline sense_reason_t core_alua_state_lba_dependent(
 449         struct se_cmd *cmd,
 450         u16 tg_pt_gp_id)
 451 {
 452         struct se_device *dev = cmd->se_dev;
 453         u64 segment_size, segment_mult, sectors, lba;
 454
 455         /* Only need to check for cdb actually containing LBAs */
 456         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
 457                 return 0;
 458
 459         spin_lock(&dev->t10_alua.lba_map_lock);
 460         segment_size = dev->t10_alua.lba_map_segment_size;
 461         segment_mult = dev->t10_alua.lba_map_segment_multiplier;
 462         sectors = cmd->data_length / dev->dev_attrib.block_size;
 463
 464         lba = cmd->t_task_lba;
 465         while (lba < cmd->t_task_lba + sectors) {
 466                 struct t10_alua_lba_map *cur_map = NULL, *map;
 467                 struct t10_alua_lba_map_member *map_mem;
 468
 469                 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
 470                                     lba_map_list) {
 471                         u64 start_lba, last_lba;
 472                         u64 first_lba = map->lba_map_first_lba;
 473
 474                         if (segment_mult) {
 475                                 u64 tmp = lba;
 476                                 start_lba = do_div(tmp, segment_size * segment_mult);
 477
 478                                 last_lba = first_lba + segment_size - 1;
 479                                 if (start_lba >= first_lba &&
 480                                     start_lba <= last_lba) {
 481                                         lba += segment_size;
 482                                         cur_map = map;
 483                                         break;
 484                                 }
 485                         } else {
 486                                 last_lba = map->lba_map_last_lba;
 487                                 if (lba >= first_lba && lba <= last_lba) {
 488                                         lba = last_lba + 1;
 489                                         cur_map = map;
 490                                         break;
 491                                 }
 492                         }
 493                 }
 494                 if (!cur_map) {
 495                         spin_unlock(&dev->t10_alua.lba_map_lock);
 496                         return TCM_ALUA_TG_PT_UNAVAILABLE;
 497                 }
 498                 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
 499                                     lba_map_mem_list) {
 500                         if (map_mem->lba_map_mem_alua_pg_id != tg_pt_gp_id)
 501                                 continue;
 502                         switch(map_mem->lba_map_mem_alua_state) {
 503                         case ALUA_ACCESS_STATE_STANDBY:
 504                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 505                                 return TCM_ALUA_TG_PT_STANDBY;
 506                         case ALUA_ACCESS_STATE_UNAVAILABLE:
 507                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 508                                 return TCM_ALUA_TG_PT_UNAVAILABLE;
 509                         default:
 510                                 break;
 511                         }
 512                 }
 513         }
 514         spin_unlock(&dev->t10_alua.lba_map_lock);
 515         return 0;
 516 }
 517
 518 static inline sense_reason_t core_alua_state_standby(
 519         struct se_cmd *cmd,
 520         unsigned char *cdb)
 521 {
 522         /*
 523          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 524          * spc4r17 section 5.9.2.4.4
 525          */
 526         switch (cdb[0]) {
 527         case INQUIRY:
 528         case LOG_SELECT:
 529         case LOG_SENSE:
 530         case MODE_SELECT:
 531         case MODE_SENSE:
 532         case REPORT_LUNS:
 533         case RECEIVE_DIAGNOSTIC:
 534         case SEND_DIAGNOSTIC:
 535         case READ_CAPACITY:
 536                 return 0;
 537         case SERVICE_ACTION_IN_16:
 538                 switch (cdb[1] & 0x1f) {
 539                 case SAI_READ_CAPACITY_16:
 540                         return 0;
 541                 default:
 542                         return TCM_ALUA_TG_PT_STANDBY;
 543                 }
 544         case MAINTENANCE_IN:
 545                 switch (cdb[1] & 0x1f) {
 546                 case MI_REPORT_TARGET_PGS:
 547                         return 0;
 548                 default:
 549                         return TCM_ALUA_TG_PT_STANDBY;
 550                 }
 551         case MAINTENANCE_OUT:
 552                 switch (cdb[1]) {
 553                 case MO_SET_TARGET_PGS:
 554                         return 0;
 555                 default:
 556                         return TCM_ALUA_TG_PT_STANDBY;
 557                 }
 558         case REQUEST_SENSE:
 559         case PERSISTENT_RESERVE_IN:
 560         case PERSISTENT_RESERVE_OUT:
 561         case READ_BUFFER:
 562         case WRITE_BUFFER:
 563                 return 0;
 564         default:
 565                 return TCM_ALUA_TG_PT_STANDBY;
 566         }
 567
 568         return 0;
 569 }
 570
 571 static inline sense_reason_t core_alua_state_unavailable(
 572         struct se_cmd *cmd,
 573         unsigned char *cdb)
 574 {
 575         /*
 576          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 577          * spc4r17 section 5.9.2.4.5
 578          */
 579         switch (cdb[0]) {
 580         case INQUIRY:
 581         case REPORT_LUNS:
 582                 return 0;
 583         case MAINTENANCE_IN:
 584                 switch (cdb[1] & 0x1f) {
 585                 case MI_REPORT_TARGET_PGS:
 586                         return 0;
 587                 default:
 588                         return TCM_ALUA_TG_PT_UNAVAILABLE;
 589                 }
 590         case MAINTENANCE_OUT:
 591                 switch (cdb[1]) {
 592                 case MO_SET_TARGET_PGS:
 593                         return 0;
 594                 default:
 595                         return TCM_ALUA_TG_PT_UNAVAILABLE;
 596                 }
 597         case REQUEST_SENSE:
 598         case READ_BUFFER:
 599         case WRITE_BUFFER:
 600                 return 0;
 601         default:
 602                 return TCM_ALUA_TG_PT_UNAVAILABLE;
 603         }
 604
 605         return 0;
 606 }
 607
 608 static inline sense_reason_t core_alua_state_transition(
 609         struct se_cmd *cmd,
 610         unsigned char *cdb)
 611 {
 612         /*
 613          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
 614          * spc4r17 section 5.9.2.5
 615          */
 616         switch (cdb[0]) {
 617         case INQUIRY:
 618         case REPORT_LUNS:
 619                 return 0;
 620         case MAINTENANCE_IN:
 621                 switch (cdb[1] & 0x1f) {
 622                 case MI_REPORT_TARGET_PGS:
 623                         return 0;
 624                 default:
 625                         return TCM_ALUA_STATE_TRANSITION;
 626                 }
 627         case REQUEST_SENSE:
 628         case READ_BUFFER:
 629         case WRITE_BUFFER:
 630                 return 0;
 631         default:
 632                 return TCM_ALUA_STATE_TRANSITION;
 633         }
 634
 635         return 0;
 636 }
 637
 638 /*
 639  * return 1: Is used to signal LUN not accessible, and check condition/not ready
 640  * return 0: Used to signal success
 641  * return -1: Used to signal failure, and invalid cdb field
 642  */
 643 sense_reason_t
 644 target_alua_state_check(struct se_cmd *cmd)
 645 {
 646         struct se_device *dev = cmd->se_dev;
 647         unsigned char *cdb = cmd->t_task_cdb;
 648         struct se_lun *lun = cmd->se_lun;
 649         struct t10_alua_tg_pt_gp *tg_pt_gp;
 650         int out_alua_state, nonop_delay_msecs;
 651         u16 tg_pt_gp_id;
 652         sense_reason_t rc = TCM_NO_SENSE;
 653
 654         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 655                 return 0;
 656         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
 657                 return 0;
 658
 659         /*
 660          * First, check for a struct se_port specific secondary ALUA target port
 661          * access state: OFFLINE
 662          */
 663         if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
 664                 pr_debug("ALUA: Got secondary offline status for local"
 665                                 " target port\n");
 666                 return TCM_ALUA_OFFLINE;
 667         }
 668         rcu_read_lock();
 669         tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
 670         if (!tg_pt_gp) {
 671                 rcu_read_unlock();
 672                 return 0;
 673         }
 674
 675         out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
 676         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 677         tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 678         rcu_read_unlock();
 679         /*
 680          * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
 681          * statement so the compiler knows explicitly to check this case first.
 682          * For the Optimized ALUA access state case, we want to process the
 683          * incoming fabric cmd ASAP..
 684          */
 685         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
 686                 return 0;
 687
 688         switch (out_alua_state) {
 689         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 690                 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
 691                 break;
 692         case ALUA_ACCESS_STATE_STANDBY:
 693                 rc = core_alua_state_standby(cmd, cdb);
 694                 break;
 695         case ALUA_ACCESS_STATE_UNAVAILABLE:
 696                 rc = core_alua_state_unavailable(cmd, cdb);
 697                 break;
 698         case ALUA_ACCESS_STATE_TRANSITION:
 699                 rc = core_alua_state_transition(cmd, cdb);
 700                 break;
 701         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 702                 rc = core_alua_state_lba_dependent(cmd, tg_pt_gp_id);
 703                 break;
 704         /*
 705          * OFFLINE is a secondary ALUA target port group access state, that is
 706          * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
 707          */
 708         case ALUA_ACCESS_STATE_OFFLINE:
 709         default:
 710                 pr_err("Unknown ALUA access state: 0x%02x\n",
 711                                 out_alua_state);
 712                 rc = TCM_INVALID_CDB_FIELD;
 713         }
 714
 715         if (rc && rc != TCM_INVALID_CDB_FIELD) {
 716                 pr_debug("[%s]: ALUA TG Port not available, "
 717                         "SenseKey: NOT_READY, ASC/rc: 0x04/%d\n",
 718                         cmd->se_tfo->fabric_name, rc);
 719         }
 720
 721         return rc;
 722 }
 723
 724 /*
 725  * Check implicit and explicit ALUA state change request.
 726  */
 727 static sense_reason_t
 728 core_alua_check_transition(int state, int valid, int *primary, int explicit)
 729 {
 730         /*
 731          * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 732          * defined as primary target port asymmetric access states.
 733          */
 734         switch (state) {
 735         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 736                 if (!(valid & ALUA_AO_SUP))
 737                         goto not_supported;
 738                 *primary = 1;
 739                 break;
 740         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 741                 if (!(valid & ALUA_AN_SUP))
 742                         goto not_supported;
 743                 *primary = 1;
 744                 break;
 745         case ALUA_ACCESS_STATE_STANDBY:
 746                 if (!(valid & ALUA_S_SUP))
 747                         goto not_supported;
 748                 *primary = 1;
 749                 break;
 750         case ALUA_ACCESS_STATE_UNAVAILABLE:
 751                 if (!(valid & ALUA_U_SUP))
 752                         goto not_supported;
 753                 *primary = 1;
 754                 break;
 755         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 756                 if (!(valid & ALUA_LBD_SUP))
 757                         goto not_supported;
 758                 *primary = 1;
 759                 break;
 760         case ALUA_ACCESS_STATE_OFFLINE:
 761                 /*
 762                  * OFFLINE state is defined as a secondary target port
 763                  * asymmetric access state.
 764                  */
 765                 if (!(valid & ALUA_O_SUP))
 766                         goto not_supported;
 767                 *primary = 0;
 768                 break;
 769         case ALUA_ACCESS_STATE_TRANSITION:
 770                 if (!(valid & ALUA_T_SUP) || explicit)
 771                         /*
 772                          * Transitioning is set internally and by tcmu daemon,
 773                          * and cannot be selected through a STPG.
 774                          */
 775                         goto not_supported;
 776                 *primary = 0;
 777                 break;
 778         default:
 779                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 780                 return TCM_INVALID_PARAMETER_LIST;
 781         }
 782
 783         return 0;
 784
 785 not_supported:
 786         pr_err("ALUA access state %s not supported",
 787                core_alua_dump_state(state));
 788         return TCM_INVALID_PARAMETER_LIST;
 789 }
 790
 791 static char *core_alua_dump_state(int state)
 792 {
 793         switch (state) {
 794         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 795                 return "Active/Optimized";
 796         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 797                 return "Active/NonOptimized";
 798         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 799                 return "LBA Dependent";
 800         case ALUA_ACCESS_STATE_STANDBY:
 801                 return "Standby";
 802         case ALUA_ACCESS_STATE_UNAVAILABLE:
 803                 return "Unavailable";
 804         case ALUA_ACCESS_STATE_OFFLINE:
 805                 return "Offline";
 806         case ALUA_ACCESS_STATE_TRANSITION:
 807                 return "Transitioning";
 808         default:
 809                 return "Unknown";
 810         }
 811
 812         return NULL;
 813 }
 814
 815 char *core_alua_dump_status(int status)
 816 {
 817         switch (status) {
 818         case ALUA_STATUS_NONE:
 819                 return "None";
 820         case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
 821                 return "Altered by Explicit STPG";
 822         case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
 823                 return "Altered by Implicit ALUA";
 824         default:
 825                 return "Unknown";
 826         }
 827
 828         return NULL;
 829 }
 830
 831 /*
 832  * Used by fabric modules to determine when we need to delay processing
 833  * for the Active/NonOptimized paths..
 834  */
 835 int core_alua_check_nonop_delay(
 836         struct se_cmd *cmd)
 837 {
 838         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 839                 return 0;
 840         /*
 841          * The ALUA Active/NonOptimized access state delay can be disabled
 842          * in via configfs with a value of zero
 843          */
 844         if (!cmd->alua_nonop_delay)
 845                 return 0;
 846         /*
 847          * struct se_cmd->alua_nonop_delay gets set by a target port group
 848          * defined interval in core_alua_state_nonoptimized()
 849          */
 850         msleep_interruptible(cmd->alua_nonop_delay);
 851         return 0;
 852 }
 853 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 854
 855 static int core_alua_write_tpg_metadata(
 856         const char *path,
 857         unsigned char *md_buf,
 858         u32 md_buf_len)
 859 {
 860         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 861         loff_t pos = 0;
 862         int ret;
 863
 864         if (IS_ERR(file)) {
 865                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 866                 return -ENODEV;
 867         }
 868         ret = kernel_write(file, md_buf, md_buf_len, &pos);
 869         if (ret < 0)
 870                 pr_err("Error writing ALUA metadata file: %s\n", path);
 871         fput(file);
 872         return (ret < 0) ? -EIO : 0;
 873 }
 874
 875 static int core_alua_update_tpg_primary_metadata(
 876         struct t10_alua_tg_pt_gp *tg_pt_gp)
 877 {
 878         unsigned char *md_buf;
 879         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 880         char *path;
 881         int len, rc;
 882
 883         lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
 884
 885         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
 886         if (!md_buf) {
 887                 pr_err("Unable to allocate buf for ALUA metadata\n");
 888                 return -ENOMEM;
 889         }
 890
 891         len = snprintf(md_buf, ALUA_MD_BUF_LEN,
 892                         "tg_pt_gp_id=%hu\n"
 893                         "alua_access_state=0x%02x\n"
 894                         "alua_access_status=0x%02x\n",
 895                         tg_pt_gp->tg_pt_gp_id,
 896                         tg_pt_gp->tg_pt_gp_alua_access_state,
 897                         tg_pt_gp->tg_pt_gp_alua_access_status);
 898
 899         rc = -ENOMEM;
 900         path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
 901                         &wwn->unit_serial[0],
 902                         config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 903         if (path) {
 904                 rc = core_alua_write_tpg_metadata(path, md_buf, len);
 905                 kfree(path);
 906         }
 907         kfree(md_buf);
 908         return rc;
 909 }
 910
 911 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
 912 {
 913         struct se_dev_entry *se_deve;
 914         struct se_lun *lun;
 915         struct se_lun_acl *lacl;
 916
 917         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 918         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
 919                                 lun_tg_pt_gp_link) {
 920                 /*
 921                  * After an implicit target port asymmetric access state
 922                  * change, a device server shall establish a unit attention
 923                  * condition for the initiator port associated with every I_T
 924                  * nexus with the additional sense code set to ASYMMETRIC
 925                  * ACCESS STATE CHANGED.
 926                  *
 927                  * After an explicit target port asymmetric access state
 928                  * change, a device server shall establish a unit attention
 929                  * condition with the additional sense code set to ASYMMETRIC
 930                  * ACCESS STATE CHANGED for the initiator port associated with
 931                  * every I_T nexus other than the I_T nexus on which the SET
 932                  * TARGET PORT GROUPS command
 933                  */
 934                 if (!percpu_ref_tryget_live(&lun->lun_ref))
 935                         continue;
 936                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 937
 938                 spin_lock(&lun->lun_deve_lock);
 939                 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
 940                         lacl = se_deve->se_lun_acl;
 941
 942                         /*
 943                          * spc4r37 p.242:
 944                          * After an explicit target port asymmetric access
 945                          * state change, a device server shall establish a
 946                          * unit attention condition with the additional sense
 947                          * code set to ASYMMETRIC ACCESS STATE CHANGED for
 948                          * the initiator port associated with every I_T nexus
 949                          * other than the I_T nexus on which the SET TARGET
 950                          * PORT GROUPS command was received.
 951                          */
 952                         if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
 953                              ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
 954                            (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
 955                             (tg_pt_gp->tg_pt_gp_alua_lun == lun))
 956                                 continue;
 957
 958                         /*
 959                          * se_deve->se_lun_acl pointer may be NULL for a
 960                          * entry created without explicit Node+MappedLUN ACLs
 961                          */
 962                         if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
 963                             (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
 964                                 continue;
 965
 966                         core_scsi3_ua_allocate(se_deve, 0x2A,
 967                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
 968                 }
 969                 spin_unlock(&lun->lun_deve_lock);
 970
 971                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 972                 percpu_ref_put(&lun->lun_ref);
 973         }
 974         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 975 }
 976
 977 static int core_alua_do_transition_tg_pt(
 978         struct t10_alua_tg_pt_gp *tg_pt_gp,
 979         int new_state,
 980         int explicit)
 981 {
 982         int prev_state;
 983
 984         mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
 985         /* Nothing to be done here */
 986         if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
 987                 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
 988                 return 0;
 989         }
 990
 991         if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
 992                 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
 993                 return -EAGAIN;
 994         }
 995
 996         /*
 997          * Save the old primary ALUA access state, and set the current state
 998          * to ALUA_ACCESS_STATE_TRANSITION.
 999          */
1000         prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1001         tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1002         tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1003                                 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1004                                 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1005
1006         core_alua_queue_state_change_ua(tg_pt_gp);
1007
1008         if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1009                 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1010                 return 0;
1011         }
1012
1013         /*
1014          * Check for the optional ALUA primary state transition delay
1015          */
1016         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1017                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1018
1019         /*
1020          * Set the current primary ALUA access state to the requested new state
1021          */
1022         tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1023
1024         /*
1025          * Update the ALUA metadata buf that has been allocated in
1026          * core_alua_do_port_transition(), this metadata will be written
1027          * to struct file.
1028          *
1029          * Note that there is the case where we do not want to update the
1030          * metadata when the saved metadata is being parsed in userspace
1031          * when setting the existing port access state and access status.
1032          *
1033          * Also note that the failure to write out the ALUA metadata to
1034          * struct file does NOT affect the actual ALUA transition.
1035          */
1036         if (tg_pt_gp->tg_pt_gp_write_metadata) {
1037                 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1038         }
1039
1040         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1041                 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1042                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1043                 tg_pt_gp->tg_pt_gp_id,
1044                 core_alua_dump_state(prev_state),
1045                 core_alua_dump_state(new_state));
1046
1047         core_alua_queue_state_change_ua(tg_pt_gp);
1048
1049         mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1050         return 0;
1051 }
1052
1053 int core_alua_do_port_transition(
1054         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1055         struct se_device *l_dev,
1056         struct se_lun *l_lun,
1057         struct se_node_acl *l_nacl,
1058         int new_state,
1059         int explicit)
1060 {
1061         struct se_device *dev;
1062         struct t10_alua_lu_gp *lu_gp;
1063         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1064         struct t10_alua_tg_pt_gp *tg_pt_gp;
1065         int primary, valid_states, rc = 0;
1066
1067         if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1068                 return -ENODEV;
1069
1070         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1071         if (core_alua_check_transition(new_state, valid_states, &primary,
1072                                        explicit) != 0)
1073                 return -EINVAL;
1074
1075         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1076         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1077         lu_gp = local_lu_gp_mem->lu_gp;
1078         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1079         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1080         /*
1081          * For storage objects that are members of the 'default_lu_gp',
1082          * we only do transition on the passed *l_tp_pt_gp, and not
1083          * on all of the matching target port groups IDs in default_lu_gp.
1084          */
1085         if (!lu_gp->lu_gp_id) {
1086                 /*
1087                  * core_alua_do_transition_tg_pt() will always return
1088                  * success.
1089                  */
1090                 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1091                 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1092                 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1093                                                    new_state, explicit);
1094                 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1095                 return rc;
1096         }
1097         /*
1098          * For all other LU groups aside from 'default_lu_gp', walk all of
1099          * the associated storage objects looking for a matching target port
1100          * group ID from the local target port group.
1101          */
1102         spin_lock(&lu_gp->lu_gp_lock);
1103         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1104                                 lu_gp_mem_list) {
1105
1106                 dev = lu_gp_mem->lu_gp_mem_dev;
1107                 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1108                 spin_unlock(&lu_gp->lu_gp_lock);
1109
1110                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1111                 list_for_each_entry(tg_pt_gp,
1112                                 &dev->t10_alua.tg_pt_gps_list,
1113                                 tg_pt_gp_list) {
1114
1115                         if (!tg_pt_gp->tg_pt_gp_valid_id)
1116                                 continue;
1117                         /*
1118                          * If the target behavior port asymmetric access state
1119                          * is changed for any target port group accessible via
1120                          * a logical unit within a LU group, the target port
1121                          * behavior group asymmetric access states for the same
1122                          * target port group accessible via other logical units
1123                          * in that LU group will also change.
1124                          */
1125                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1126                                 continue;
1127
1128                         if (l_tg_pt_gp == tg_pt_gp) {
1129                                 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1130                                 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1131                         } else {
1132                                 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1133                                 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1134                         }
1135                         atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1136                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1137                         /*
1138                          * core_alua_do_transition_tg_pt() will always return
1139                          * success.
1140                          */
1141                         rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1142                                         new_state, explicit);
1143
1144                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1145                         atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1146                         if (rc)
1147                                 break;
1148                 }
1149                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1150
1151                 spin_lock(&lu_gp->lu_gp_lock);
1152                 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1153         }
1154         spin_unlock(&lu_gp->lu_gp_lock);
1155
1156         if (!rc) {
1157                 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1158                          " Group IDs: %hu %s transition to primary state: %s\n",
1159                          config_item_name(&lu_gp->lu_gp_group.cg_item),
1160                          l_tg_pt_gp->tg_pt_gp_id,
1161                          (explicit) ? "explicit" : "implicit",
1162                          core_alua_dump_state(new_state));
1163         }
1164
1165         atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1166         return rc;
1167 }
1168
1169 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1170 {
1171         struct se_portal_group *se_tpg = lun->lun_tpg;
1172         unsigned char *md_buf;
1173         char *path;
1174         int len, rc;
1175
1176         mutex_lock(&lun->lun_tg_pt_md_mutex);
1177
1178         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1179         if (!md_buf) {
1180                 pr_err("Unable to allocate buf for ALUA metadata\n");
1181                 rc = -ENOMEM;
1182                 goto out_unlock;
1183         }
1184
1185         len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1186                         "alua_tg_pt_status=0x%02x\n",
1187                         atomic_read(&lun->lun_tg_pt_secondary_offline),
1188                         lun->lun_tg_pt_secondary_stat);
1189
1190         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
1191                 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
1192                                 db_root, se_tpg->se_tpg_tfo->fabric_name,
1193                                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1194                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
1195                                 lun->unpacked_lun);
1196         } else {
1197                 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
1198                                 db_root, se_tpg->se_tpg_tfo->fabric_name,
1199                                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1200                                 lun->unpacked_lun);
1201         }
1202         if (!path) {
1203                 rc = -ENOMEM;
1204                 goto out_free;
1205         }
1206
1207         rc = core_alua_write_tpg_metadata(path, md_buf, len);
1208         kfree(path);
1209 out_free:
1210         kfree(md_buf);
1211 out_unlock:
1212         mutex_unlock(&lun->lun_tg_pt_md_mutex);
1213         return rc;
1214 }
1215
1216 static int core_alua_set_tg_pt_secondary_state(
1217         struct se_lun *lun,
1218         int explicit,
1219         int offline)
1220 {
1221         struct t10_alua_tg_pt_gp *tg_pt_gp;
1222         int trans_delay_msecs;
1223
1224         rcu_read_lock();
1225         tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
1226         if (!tg_pt_gp) {
1227                 rcu_read_unlock();
1228                 pr_err("Unable to complete secondary state"
1229                                 " transition\n");
1230                 return -EINVAL;
1231         }
1232         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1233         /*
1234          * Set the secondary ALUA target port access state to OFFLINE
1235          * or release the previously secondary state for struct se_lun
1236          */
1237         if (offline)
1238                 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1239         else
1240                 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1241
1242         lun->lun_tg_pt_secondary_stat = (explicit) ?
1243                         ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1244                         ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1245
1246         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1247                 " to secondary access state: %s\n", (explicit) ? "explicit" :
1248                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1249                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1250
1251         rcu_read_unlock();
1252         /*
1253          * Do the optional transition delay after we set the secondary
1254          * ALUA access state.
1255          */
1256         if (trans_delay_msecs != 0)
1257                 msleep_interruptible(trans_delay_msecs);
1258         /*
1259          * See if we need to update the ALUA fabric port metadata for
1260          * secondary state and status
1261          */
1262         if (lun->lun_tg_pt_secondary_write_md)
1263                 core_alua_update_tpg_secondary_metadata(lun);
1264
1265         return 0;
1266 }
1267
1268 struct t10_alua_lba_map *
1269 core_alua_allocate_lba_map(struct list_head *list,
1270                            u64 first_lba, u64 last_lba)
1271 {
1272         struct t10_alua_lba_map *lba_map;
1273
1274         lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1275         if (!lba_map) {
1276                 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1277                 return ERR_PTR(-ENOMEM);
1278         }
1279         INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1280         lba_map->lba_map_first_lba = first_lba;
1281         lba_map->lba_map_last_lba = last_lba;
1282
1283         list_add_tail(&lba_map->lba_map_list, list);
1284         return lba_map;
1285 }
1286
1287 int
1288 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1289                                int pg_id, int state)
1290 {
1291         struct t10_alua_lba_map_member *lba_map_mem;
1292
1293         list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1294                             lba_map_mem_list) {
1295                 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1296                         pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1297                         return -EINVAL;
1298                 }
1299         }
1300
1301         lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1302         if (!lba_map_mem) {
1303                 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1304                 return -ENOMEM;
1305         }
1306         lba_map_mem->lba_map_mem_alua_state = state;
1307         lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1308
1309         list_add_tail(&lba_map_mem->lba_map_mem_list,
1310                       &lba_map->lba_map_mem_list);
1311         return 0;
1312 }
1313
1314 void
1315 core_alua_free_lba_map(struct list_head *lba_list)
1316 {
1317         struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1318         struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1319
1320         list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1321                                  lba_map_list) {
1322                 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1323                                          &lba_map->lba_map_mem_list,
1324                                          lba_map_mem_list) {
1325                         list_del(&lba_map_mem->lba_map_mem_list);
1326                         kmem_cache_free(t10_alua_lba_map_mem_cache,
1327                                         lba_map_mem);
1328                 }
1329                 list_del(&lba_map->lba_map_list);
1330                 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1331         }
1332 }
1333
1334 void
1335 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1336                       int segment_size, int segment_mult)
1337 {
1338         struct list_head old_lba_map_list;
1339         struct t10_alua_tg_pt_gp *tg_pt_gp;
1340         int activate = 0, supported;
1341
1342         INIT_LIST_HEAD(&old_lba_map_list);
1343         spin_lock(&dev->t10_alua.lba_map_lock);
1344         dev->t10_alua.lba_map_segment_size = segment_size;
1345         dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1346         list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1347         if (lba_map_list) {
1348                 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1349                 activate = 1;
1350         }
1351         spin_unlock(&dev->t10_alua.lba_map_lock);
1352         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1353         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1354                             tg_pt_gp_list) {
1355
1356                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1357                         continue;
1358                 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1359                 if (activate)
1360                         supported |= ALUA_LBD_SUP;
1361                 else
1362                         supported &= ~ALUA_LBD_SUP;
1363                 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1364         }
1365         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1366         core_alua_free_lba_map(&old_lba_map_list);
1367 }
1368
1369 struct t10_alua_lu_gp *
1370 core_alua_allocate_lu_gp(const char *name, int def_group)
1371 {
1372         struct t10_alua_lu_gp *lu_gp;
1373
1374         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1375         if (!lu_gp) {
1376                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1377                 return ERR_PTR(-ENOMEM);
1378         }
1379         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1380         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1381         spin_lock_init(&lu_gp->lu_gp_lock);
1382         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1383
1384         if (def_group) {
1385                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1386                 lu_gp->lu_gp_valid_id = 1;
1387                 alua_lu_gps_count++;
1388         }
1389
1390         return lu_gp;
1391 }
1392
1393 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1394 {
1395         struct t10_alua_lu_gp *lu_gp_tmp;
1396         u16 lu_gp_id_tmp;
1397         /*
1398          * The lu_gp->lu_gp_id may only be set once..
1399          */
1400         if (lu_gp->lu_gp_valid_id) {
1401                 pr_warn("ALUA LU Group already has a valid ID,"
1402                         " ignoring request\n");
1403                 return -EINVAL;
1404         }
1405
1406         spin_lock(&lu_gps_lock);
1407         if (alua_lu_gps_count == 0x0000ffff) {
1408                 pr_err("Maximum ALUA alua_lu_gps_count:"
1409                                 " 0x0000ffff reached\n");
1410                 spin_unlock(&lu_gps_lock);
1411                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1412                 return -ENOSPC;
1413         }
1414 again:
1415         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1416                                 alua_lu_gps_counter++;
1417
1418         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1419                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1420                         if (!lu_gp_id)
1421                                 goto again;
1422
1423                         pr_warn("ALUA Logical Unit Group ID: %hu"
1424                                 " already exists, ignoring request\n",
1425                                 lu_gp_id);
1426                         spin_unlock(&lu_gps_lock);
1427                         return -EINVAL;
1428                 }
1429         }
1430
1431         lu_gp->lu_gp_id = lu_gp_id_tmp;
1432         lu_gp->lu_gp_valid_id = 1;
1433         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1434         alua_lu_gps_count++;
1435         spin_unlock(&lu_gps_lock);
1436
1437         return 0;
1438 }
1439
1440 static struct t10_alua_lu_gp_member *
1441 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1442 {
1443         struct t10_alua_lu_gp_member *lu_gp_mem;
1444
1445         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1446         if (!lu_gp_mem) {
1447                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1448                 return ERR_PTR(-ENOMEM);
1449         }
1450         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1451         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1452         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1453
1454         lu_gp_mem->lu_gp_mem_dev = dev;
1455         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1456
1457         return lu_gp_mem;
1458 }
1459
1460 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1461 {
1462         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1463         /*
1464          * Once we have reached this point, config_item_put() has
1465          * already been called from target_core_alua_drop_lu_gp().
1466          *
1467          * Here, we remove the *lu_gp from the global list so that
1468          * no associations can be made while we are releasing
1469          * struct t10_alua_lu_gp.
1470          */
1471         spin_lock(&lu_gps_lock);
1472         list_del(&lu_gp->lu_gp_node);
1473         alua_lu_gps_count--;
1474         spin_unlock(&lu_gps_lock);
1475         /*
1476          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1477          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1478          * released with core_alua_put_lu_gp_from_name()
1479          */
1480         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1481                 cpu_relax();
1482         /*
1483          * Release reference to struct t10_alua_lu_gp * from all associated
1484          * struct se_device.
1485          */
1486         spin_lock(&lu_gp->lu_gp_lock);
1487         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1488                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1489                 if (lu_gp_mem->lu_gp_assoc) {
1490                         list_del(&lu_gp_mem->lu_gp_mem_list);
1491                         lu_gp->lu_gp_members--;
1492                         lu_gp_mem->lu_gp_assoc = 0;
1493                 }
1494                 spin_unlock(&lu_gp->lu_gp_lock);
1495                 /*
1496                  *
1497                  * lu_gp_mem is associated with a single
1498                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1499                  * struct se_device is released via core_alua_free_lu_gp_mem().
1500                  *
1501                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1502                  * we want to re-associate a given lu_gp_mem with default_lu_gp.
1503                  */
1504                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1505                 if (lu_gp != default_lu_gp)
1506                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1507                                         default_lu_gp);
1508                 else
1509                         lu_gp_mem->lu_gp = NULL;
1510                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1511
1512                 spin_lock(&lu_gp->lu_gp_lock);
1513         }
1514         spin_unlock(&lu_gp->lu_gp_lock);
1515
1516         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1517 }
1518
1519 void core_alua_free_lu_gp_mem(struct se_device *dev)
1520 {
1521         struct t10_alua_lu_gp *lu_gp;
1522         struct t10_alua_lu_gp_member *lu_gp_mem;
1523
1524         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1525         if (!lu_gp_mem)
1526                 return;
1527
1528         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1529                 cpu_relax();
1530
1531         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1532         lu_gp = lu_gp_mem->lu_gp;
1533         if (lu_gp) {
1534                 spin_lock(&lu_gp->lu_gp_lock);
1535                 if (lu_gp_mem->lu_gp_assoc) {
1536                         list_del(&lu_gp_mem->lu_gp_mem_list);
1537                         lu_gp->lu_gp_members--;
1538                         lu_gp_mem->lu_gp_assoc = 0;
1539                 }
1540                 spin_unlock(&lu_gp->lu_gp_lock);
1541                 lu_gp_mem->lu_gp = NULL;
1542         }
1543         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1544
1545         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1546 }
1547
1548 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1549 {
1550         struct t10_alua_lu_gp *lu_gp;
1551         struct config_item *ci;
1552
1553         spin_lock(&lu_gps_lock);
1554         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1555                 if (!lu_gp->lu_gp_valid_id)
1556                         continue;
1557                 ci = &lu_gp->lu_gp_group.cg_item;
1558                 if (!strcmp(config_item_name(ci), name)) {
1559                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1560                         spin_unlock(&lu_gps_lock);
1561                         return lu_gp;
1562                 }
1563         }
1564         spin_unlock(&lu_gps_lock);
1565
1566         return NULL;
1567 }
1568
1569 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1570 {
1571         spin_lock(&lu_gps_lock);
1572         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1573         spin_unlock(&lu_gps_lock);
1574 }
1575
1576 /*
1577  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1578  */
1579 void __core_alua_attach_lu_gp_mem(
1580         struct t10_alua_lu_gp_member *lu_gp_mem,
1581         struct t10_alua_lu_gp *lu_gp)
1582 {
1583         spin_lock(&lu_gp->lu_gp_lock);
1584         lu_gp_mem->lu_gp = lu_gp;
1585         lu_gp_mem->lu_gp_assoc = 1;
1586         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1587         lu_gp->lu_gp_members++;
1588         spin_unlock(&lu_gp->lu_gp_lock);
1589 }
1590
1591 /*
1592  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1593  */
1594 void __core_alua_drop_lu_gp_mem(
1595         struct t10_alua_lu_gp_member *lu_gp_mem,
1596         struct t10_alua_lu_gp *lu_gp)
1597 {
1598         spin_lock(&lu_gp->lu_gp_lock);
1599         list_del(&lu_gp_mem->lu_gp_mem_list);
1600         lu_gp_mem->lu_gp = NULL;
1601         lu_gp_mem->lu_gp_assoc = 0;
1602         lu_gp->lu_gp_members--;
1603         spin_unlock(&lu_gp->lu_gp_lock);
1604 }
1605
1606 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1607                 const char *name, int def_group)
1608 {
1609         struct t10_alua_tg_pt_gp *tg_pt_gp;
1610
1611         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1612         if (!tg_pt_gp) {
1613                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1614                 return NULL;
1615         }
1616         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1617         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1618         mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1619         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1620         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1621         tg_pt_gp->tg_pt_gp_dev = dev;
1622         tg_pt_gp->tg_pt_gp_alua_access_state =
1623                         ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1624         /*
1625          * Enable both explicit and implicit ALUA support by default
1626          */
1627         tg_pt_gp->tg_pt_gp_alua_access_type =
1628                         TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1629         /*
1630          * Set the default Active/NonOptimized Delay in milliseconds
1631          */
1632         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1633         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1634         tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1635
1636         /*
1637          * Enable all supported states
1638          */
1639         tg_pt_gp->tg_pt_gp_alua_supported_states =
1640             ALUA_T_SUP | ALUA_O_SUP |
1641             ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1642
1643         if (def_group) {
1644                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1645                 tg_pt_gp->tg_pt_gp_id =
1646                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1647                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1648                 dev->t10_alua.alua_tg_pt_gps_count++;
1649                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1650                               &dev->t10_alua.tg_pt_gps_list);
1651                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1652         }
1653
1654         return tg_pt_gp;
1655 }
1656
1657 int core_alua_set_tg_pt_gp_id(
1658         struct t10_alua_tg_pt_gp *tg_pt_gp,
1659         u16 tg_pt_gp_id)
1660 {
1661         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1662         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1663         u16 tg_pt_gp_id_tmp;
1664
1665         /*
1666          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1667          */
1668         if (tg_pt_gp->tg_pt_gp_valid_id) {
1669                 pr_warn("ALUA TG PT Group already has a valid ID,"
1670                         " ignoring request\n");
1671                 return -EINVAL;
1672         }
1673
1674         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1675         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1676                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1677                         " 0x0000ffff reached\n");
1678                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1679                 return -ENOSPC;
1680         }
1681 again:
1682         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1683                         dev->t10_alua.alua_tg_pt_gps_counter++;
1684
1685         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1686                         tg_pt_gp_list) {
1687                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1688                         if (!tg_pt_gp_id)
1689                                 goto again;
1690
1691                         pr_err("ALUA Target Port Group ID: %hu already"
1692                                 " exists, ignoring request\n", tg_pt_gp_id);
1693                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1694                         return -EINVAL;
1695                 }
1696         }
1697
1698         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1699         tg_pt_gp->tg_pt_gp_valid_id = 1;
1700         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1701                         &dev->t10_alua.tg_pt_gps_list);
1702         dev->t10_alua.alua_tg_pt_gps_count++;
1703         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1704
1705         return 0;
1706 }
1707
1708 void core_alua_free_tg_pt_gp(
1709         struct t10_alua_tg_pt_gp *tg_pt_gp)
1710 {
1711         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1712         struct se_lun *lun, *next;
1713
1714         /*
1715          * Once we have reached this point, config_item_put() has already
1716          * been called from target_core_alua_drop_tg_pt_gp().
1717          *
1718          * Here we remove *tg_pt_gp from the global list so that
1719          * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1720          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1721          */
1722         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1723         if (tg_pt_gp->tg_pt_gp_valid_id) {
1724                 list_del(&tg_pt_gp->tg_pt_gp_list);
1725                 dev->t10_alua.alua_tg_pt_gps_count--;
1726         }
1727         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1728
1729         /*
1730          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1731          * core_alua_get_tg_pt_gp_by_name() in
1732          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1733          * to be released with core_alua_put_tg_pt_gp_from_name().
1734          */
1735         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1736                 cpu_relax();
1737
1738         /*
1739          * Release reference to struct t10_alua_tg_pt_gp from all associated
1740          * struct se_port.
1741          */
1742         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1743         list_for_each_entry_safe(lun, next,
1744                         &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1745                 list_del_init(&lun->lun_tg_pt_gp_link);
1746                 tg_pt_gp->tg_pt_gp_members--;
1747
1748                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1749                 /*
1750                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1751                  * assume we want to re-associate a given tg_pt_gp_mem with
1752                  * default_tg_pt_gp.
1753                  */
1754                 spin_lock(&lun->lun_tg_pt_gp_lock);
1755                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1756                         __target_attach_tg_pt_gp(lun,
1757                                         dev->t10_alua.default_tg_pt_gp);
1758                 } else
1759                         rcu_assign_pointer(lun->lun_tg_pt_gp, NULL);
1760                 spin_unlock(&lun->lun_tg_pt_gp_lock);
1761
1762                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1763         }
1764         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1765
1766         synchronize_rcu();
1767         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1768 }
1769
1770 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1771                 struct se_device *dev, const char *name)
1772 {
1773         struct t10_alua_tg_pt_gp *tg_pt_gp;
1774         struct config_item *ci;
1775
1776         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1777         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1778                         tg_pt_gp_list) {
1779                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1780                         continue;
1781                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1782                 if (!strcmp(config_item_name(ci), name)) {
1783                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1784                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1785                         return tg_pt_gp;
1786                 }
1787         }
1788         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1789
1790         return NULL;
1791 }
1792
1793 static void core_alua_put_tg_pt_gp_from_name(
1794         struct t10_alua_tg_pt_gp *tg_pt_gp)
1795 {
1796         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1797
1798         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1799         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1800         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1801 }
1802
1803 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1804                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1805 {
1806         struct se_dev_entry *se_deve;
1807
1808         assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1809
1810         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1811         rcu_assign_pointer(lun->lun_tg_pt_gp, tg_pt_gp);
1812         list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1813         tg_pt_gp->tg_pt_gp_members++;
1814         spin_lock(&lun->lun_deve_lock);
1815         list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1816                 core_scsi3_ua_allocate(se_deve, 0x3f,
1817                                        ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1818         spin_unlock(&lun->lun_deve_lock);
1819         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1820 }
1821
1822 void target_attach_tg_pt_gp(struct se_lun *lun,
1823                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1824 {
1825         spin_lock(&lun->lun_tg_pt_gp_lock);
1826         __target_attach_tg_pt_gp(lun, tg_pt_gp);
1827         spin_unlock(&lun->lun_tg_pt_gp_lock);
1828         synchronize_rcu();
1829 }
1830
1831 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1832                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1833 {
1834         assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1835
1836         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1837         list_del_init(&lun->lun_tg_pt_gp_link);
1838         tg_pt_gp->tg_pt_gp_members--;
1839         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1840 }
1841
1842 void target_detach_tg_pt_gp(struct se_lun *lun)
1843 {
1844         struct t10_alua_tg_pt_gp *tg_pt_gp;
1845
1846         spin_lock(&lun->lun_tg_pt_gp_lock);
1847         tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp,
1848                                 lockdep_is_held(&lun->lun_tg_pt_gp_lock));
1849         if (tg_pt_gp) {
1850                 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1851                 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL);
1852         }
1853         spin_unlock(&lun->lun_tg_pt_gp_lock);
1854         synchronize_rcu();
1855 }
1856
1857 static void target_swap_tg_pt_gp(struct se_lun *lun,
1858                                  struct t10_alua_tg_pt_gp *old_tg_pt_gp,
1859                                  struct t10_alua_tg_pt_gp *new_tg_pt_gp)
1860 {
1861         assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1862
1863         if (old_tg_pt_gp)
1864                 __target_detach_tg_pt_gp(lun, old_tg_pt_gp);
1865         __target_attach_tg_pt_gp(lun, new_tg_pt_gp);
1866 }
1867
1868 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1869 {
1870         struct config_item *tg_pt_ci;
1871         struct t10_alua_tg_pt_gp *tg_pt_gp;
1872         ssize_t len = 0;
1873
1874         rcu_read_lock();
1875         tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
1876         if (tg_pt_gp) {
1877                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1878                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1879                         " %hu\nTG Port Primary Access State: %s\nTG Port "
1880                         "Primary Access Status: %s\nTG Port Secondary Access"
1881                         " State: %s\nTG Port Secondary Access Status: %s\n",
1882                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1883                         core_alua_dump_state(
1884                                 tg_pt_gp->tg_pt_gp_alua_access_state),
1885                         core_alua_dump_status(
1886                                 tg_pt_gp->tg_pt_gp_alua_access_status),
1887                         atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1888                         "Offline" : "None",
1889                         core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1890         }
1891         rcu_read_unlock();
1892
1893         return len;
1894 }
1895
1896 ssize_t core_alua_store_tg_pt_gp_info(
1897         struct se_lun *lun,
1898         const char *page,
1899         size_t count)
1900 {
1901         struct se_portal_group *tpg = lun->lun_tpg;
1902         /*
1903          * rcu_dereference_raw protected by se_lun->lun_group symlink
1904          * reference to se_device->dev_group.
1905          */
1906         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1907         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1908         unsigned char buf[TG_PT_GROUP_NAME_BUF];
1909         int move = 0;
1910
1911         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1912             (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1913                 return -ENODEV;
1914
1915         if (count > TG_PT_GROUP_NAME_BUF) {
1916                 pr_err("ALUA Target Port Group alias too large!\n");
1917                 return -EINVAL;
1918         }
1919         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1920         memcpy(buf, page, count);
1921         /*
1922          * Any ALUA target port group alias besides "NULL" means we will be
1923          * making a new group association.
1924          */
1925         if (strcmp(strstrip(buf), "NULL")) {
1926                 /*
1927                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
1928                  * struct t10_alua_tg_pt_gp.  This reference is released with
1929                  * core_alua_put_tg_pt_gp_from_name() below.
1930                  */
1931                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1932                                         strstrip(buf));
1933                 if (!tg_pt_gp_new)
1934                         return -ENODEV;
1935         }
1936
1937         spin_lock(&lun->lun_tg_pt_gp_lock);
1938         tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp,
1939                                 lockdep_is_held(&lun->lun_tg_pt_gp_lock));
1940         if (tg_pt_gp) {
1941                 /*
1942                  * Clearing an existing tg_pt_gp association, and replacing
1943                  * with the default_tg_pt_gp.
1944                  */
1945                 if (!tg_pt_gp_new) {
1946                         pr_debug("Target_Core_ConfigFS: Moving"
1947                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1948                                 " alua/%s, ID: %hu back to"
1949                                 " default_tg_pt_gp\n",
1950                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1951                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1952                                 config_item_name(&lun->lun_group.cg_item),
1953                                 config_item_name(
1954                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
1955                                 tg_pt_gp->tg_pt_gp_id);
1956
1957                         target_swap_tg_pt_gp(lun, tg_pt_gp,
1958                                         dev->t10_alua.default_tg_pt_gp);
1959                         spin_unlock(&lun->lun_tg_pt_gp_lock);
1960
1961                         goto sync_rcu;
1962                 }
1963                 move = 1;
1964         }
1965
1966         target_swap_tg_pt_gp(lun, tg_pt_gp, tg_pt_gp_new);
1967         spin_unlock(&lun->lun_tg_pt_gp_lock);
1968         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1969                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1970                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1971                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1972                 config_item_name(&lun->lun_group.cg_item),
1973                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1974                 tg_pt_gp_new->tg_pt_gp_id);
1975
1976         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1977 sync_rcu:
1978         synchronize_rcu();
1979         return count;
1980 }
1981
1982 ssize_t core_alua_show_access_type(
1983         struct t10_alua_tg_pt_gp *tg_pt_gp,
1984         char *page)
1985 {
1986         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
1987             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
1988                 return sprintf(page, "Implicit and Explicit\n");
1989         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
1990                 return sprintf(page, "Implicit\n");
1991         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
1992                 return sprintf(page, "Explicit\n");
1993         else
1994                 return sprintf(page, "None\n");
1995 }
1996
1997 ssize_t core_alua_store_access_type(
1998         struct t10_alua_tg_pt_gp *tg_pt_gp,
1999         const char *page,
2000         size_t count)
2001 {
2002         unsigned long tmp;
2003         int ret;
2004
2005         ret = kstrtoul(page, 0, &tmp);
2006         if (ret < 0) {
2007                 pr_err("Unable to extract alua_access_type\n");
2008                 return ret;
2009         }
2010         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2011                 pr_err("Illegal value for alua_access_type:"
2012                                 " %lu\n", tmp);
2013                 return -EINVAL;
2014         }
2015         if (tmp == 3)
2016                 tg_pt_gp->tg_pt_gp_alua_access_type =
2017                         TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2018         else if (tmp == 2)
2019                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2020         else if (tmp == 1)
2021                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2022         else
2023                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2024
2025         return count;
2026 }
2027
2028 ssize_t core_alua_show_nonop_delay_msecs(
2029         struct t10_alua_tg_pt_gp *tg_pt_gp,
2030         char *page)
2031 {
2032         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2033 }
2034
2035 ssize_t core_alua_store_nonop_delay_msecs(
2036         struct t10_alua_tg_pt_gp *tg_pt_gp,
2037         const char *page,
2038         size_t count)
2039 {
2040         unsigned long tmp;
2041         int ret;
2042
2043         ret = kstrtoul(page, 0, &tmp);
2044         if (ret < 0) {
2045                 pr_err("Unable to extract nonop_delay_msecs\n");
2046                 return ret;
2047         }
2048         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2049                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2050                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2051                         ALUA_MAX_NONOP_DELAY_MSECS);
2052                 return -EINVAL;
2053         }
2054         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2055
2056         return count;
2057 }
2058
2059 ssize_t core_alua_show_trans_delay_msecs(
2060         struct t10_alua_tg_pt_gp *tg_pt_gp,
2061         char *page)
2062 {
2063         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2064 }
2065
2066 ssize_t core_alua_store_trans_delay_msecs(
2067         struct t10_alua_tg_pt_gp *tg_pt_gp,
2068         const char *page,
2069         size_t count)
2070 {
2071         unsigned long tmp;
2072         int ret;
2073
2074         ret = kstrtoul(page, 0, &tmp);
2075         if (ret < 0) {
2076                 pr_err("Unable to extract trans_delay_msecs\n");
2077                 return ret;
2078         }
2079         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2080                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2081                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2082                         ALUA_MAX_TRANS_DELAY_MSECS);
2083                 return -EINVAL;
2084         }
2085         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2086
2087         return count;
2088 }
2089
2090 ssize_t core_alua_show_implicit_trans_secs(
2091         struct t10_alua_tg_pt_gp *tg_pt_gp,
2092         char *page)
2093 {
2094         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2095 }
2096
2097 ssize_t core_alua_store_implicit_trans_secs(
2098         struct t10_alua_tg_pt_gp *tg_pt_gp,
2099         const char *page,
2100         size_t count)
2101 {
2102         unsigned long tmp;
2103         int ret;
2104
2105         ret = kstrtoul(page, 0, &tmp);
2106         if (ret < 0) {
2107                 pr_err("Unable to extract implicit_trans_secs\n");
2108                 return ret;
2109         }
2110         if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2111                 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2112                         " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2113                         ALUA_MAX_IMPLICIT_TRANS_SECS);
2114                 return  -EINVAL;
2115         }
2116         tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2117
2118         return count;
2119 }
2120
2121 ssize_t core_alua_show_preferred_bit(
2122         struct t10_alua_tg_pt_gp *tg_pt_gp,
2123         char *page)
2124 {
2125         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2126 }
2127
2128 ssize_t core_alua_store_preferred_bit(
2129         struct t10_alua_tg_pt_gp *tg_pt_gp,
2130         const char *page,
2131         size_t count)
2132 {
2133         unsigned long tmp;
2134         int ret;
2135
2136         ret = kstrtoul(page, 0, &tmp);
2137         if (ret < 0) {
2138                 pr_err("Unable to extract preferred ALUA value\n");
2139                 return ret;
2140         }
2141         if ((tmp != 0) && (tmp != 1)) {
2142                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2143                 return -EINVAL;
2144         }
2145         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2146
2147         return count;
2148 }
2149
2150 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2151 {
2152         return sprintf(page, "%d\n",
2153                 atomic_read(&lun->lun_tg_pt_secondary_offline));
2154 }
2155
2156 ssize_t core_alua_store_offline_bit(
2157         struct se_lun *lun,
2158         const char *page,
2159         size_t count)
2160 {
2161         /*
2162          * rcu_dereference_raw protected by se_lun->lun_group symlink
2163          * reference to se_device->dev_group.
2164          */
2165         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2166         unsigned long tmp;
2167         int ret;
2168
2169         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2170             (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2171                 return -ENODEV;
2172
2173         ret = kstrtoul(page, 0, &tmp);
2174         if (ret < 0) {
2175                 pr_err("Unable to extract alua_tg_pt_offline value\n");
2176                 return ret;
2177         }
2178         if ((tmp != 0) && (tmp != 1)) {
2179                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2180                                 tmp);
2181                 return -EINVAL;
2182         }
2183
2184         ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2185         if (ret < 0)
2186                 return -EINVAL;
2187
2188         return count;
2189 }
2190
2191 ssize_t core_alua_show_secondary_status(
2192         struct se_lun *lun,
2193         char *page)
2194 {
2195         return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2196 }
2197
2198 ssize_t core_alua_store_secondary_status(
2199         struct se_lun *lun,
2200         const char *page,
2201         size_t count)
2202 {
2203         unsigned long tmp;
2204         int ret;
2205
2206         ret = kstrtoul(page, 0, &tmp);
2207         if (ret < 0) {
2208                 pr_err("Unable to extract alua_tg_pt_status\n");
2209                 return ret;
2210         }
2211         if ((tmp != ALUA_STATUS_NONE) &&
2212             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2213             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2214                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2215                                 tmp);
2216                 return -EINVAL;
2217         }
2218         lun->lun_tg_pt_secondary_stat = (int)tmp;
2219
2220         return count;
2221 }
2222
2223 ssize_t core_alua_show_secondary_write_metadata(
2224         struct se_lun *lun,
2225         char *page)
2226 {
2227         return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2228 }
2229
2230 ssize_t core_alua_store_secondary_write_metadata(
2231         struct se_lun *lun,
2232         const char *page,
2233         size_t count)
2234 {
2235         unsigned long tmp;
2236         int ret;
2237
2238         ret = kstrtoul(page, 0, &tmp);
2239         if (ret < 0) {
2240                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2241                 return ret;
2242         }
2243         if ((tmp != 0) && (tmp != 1)) {
2244                 pr_err("Illegal value for alua_tg_pt_write_md:"
2245                                 " %lu\n", tmp);
2246                 return -EINVAL;
2247         }
2248         lun->lun_tg_pt_secondary_write_md = (int)tmp;
2249
2250         return count;
2251 }
2252
2253 int core_setup_alua(struct se_device *dev)
2254 {
2255         if (!(dev->transport_flags &
2256              TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2257             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2258                 struct t10_alua_lu_gp_member *lu_gp_mem;
2259
2260                 /*
2261                  * Associate this struct se_device with the default ALUA
2262                  * LUN Group.
2263                  */
2264                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2265                 if (IS_ERR(lu_gp_mem))
2266                         return PTR_ERR(lu_gp_mem);
2267
2268                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2269                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2270                                 default_lu_gp);
2271                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2272
2273                 pr_debug("%s: Adding to default ALUA LU Group:"
2274                         " core/alua/lu_gps/default_lu_gp\n",
2275                         dev->transport->name);
2276         }
2277
2278         return 0;
2279 }