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