drivers/target/target_core_alua.c

   1 /*******************************************************************************
   2  * Filename:  target_core_alua.c
   3  *
   4  * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
   5  *
   6  * (c) Copyright 2009-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/slab.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/configfs.h>
  29 #include <linux/export.h>
  30 #include <linux/file.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38
  39 #include "target_core_internal.h"
  40 #include "target_core_alua.h"
  41 #include "target_core_ua.h"
  42
  43 static sense_reason_t core_alua_check_transition(int state, int valid,
  44                                                  int *primary);
  45 static int core_alua_set_tg_pt_secondary_state(
  46                 struct se_lun *lun, int explicit, int offline);
  47
  48 static char *core_alua_dump_state(int state);
  49
  50 static void __target_attach_tg_pt_gp(struct se_lun *lun,
  51                 struct t10_alua_tg_pt_gp *tg_pt_gp);
  52
  53 static u16 alua_lu_gps_counter;
  54 static u32 alua_lu_gps_count;
  55
  56 static DEFINE_SPINLOCK(lu_gps_lock);
  57 static LIST_HEAD(lu_gps_list);
  58
  59 struct t10_alua_lu_gp *default_lu_gp;
  60
  61 /*
  62  * REPORT REFERRALS
  63  *
  64  * See sbc3r35 section 5.23
  65  */
  66 sense_reason_t
  67 target_emulate_report_referrals(struct se_cmd *cmd)
  68 {
  69         struct se_device *dev = cmd->se_dev;
  70         struct t10_alua_lba_map *map;
  71         struct t10_alua_lba_map_member *map_mem;
  72         unsigned char *buf;
  73         u32 rd_len = 0, off;
  74
  75         if (cmd->data_length < 4) {
  76                 pr_warn("REPORT REFERRALS allocation length %u too"
  77                         " small\n", cmd->data_length);
  78                 return TCM_INVALID_CDB_FIELD;
  79         }
  80
  81         buf = transport_kmap_data_sg(cmd);
  82         if (!buf)
  83                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  84
  85         off = 4;
  86         spin_lock(&dev->t10_alua.lba_map_lock);
  87         if (list_empty(&dev->t10_alua.lba_map_list)) {
  88                 spin_unlock(&dev->t10_alua.lba_map_lock);
  89                 transport_kunmap_data_sg(cmd);
  90
  91                 return TCM_UNSUPPORTED_SCSI_OPCODE;
  92         }
  93
  94         list_for_each_entry(map, &dev->t10_alua.lba_map_list,
  95                             lba_map_list) {
  96                 int desc_num = off + 3;
  97                 int pg_num;
  98
  99                 off += 4;
 100                 if (cmd->data_length > off)
 101                         put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
 102                 off += 8;
 103                 if (cmd->data_length > off)
 104                         put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
 105                 off += 8;
 106                 rd_len += 20;
 107                 pg_num = 0;
 108                 list_for_each_entry(map_mem, &map->lba_map_mem_list,
 109                                     lba_map_mem_list) {
 110                         int alua_state = map_mem->lba_map_mem_alua_state;
 111                         int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
 112
 113                         if (cmd->data_length > off)
 114                                 buf[off] = alua_state & 0x0f;
 115                         off += 2;
 116                         if (cmd->data_length > off)
 117                                 buf[off] = (alua_pg_id >> 8) & 0xff;
 118                         off++;
 119                         if (cmd->data_length > off)
 120                                 buf[off] = (alua_pg_id & 0xff);
 121                         off++;
 122                         rd_len += 4;
 123                         pg_num++;
 124                 }
 125                 if (cmd->data_length > desc_num)
 126                         buf[desc_num] = pg_num;
 127         }
 128         spin_unlock(&dev->t10_alua.lba_map_lock);
 129
 130         /*
 131          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 132          */
 133         put_unaligned_be16(rd_len, &buf[2]);
 134
 135         transport_kunmap_data_sg(cmd);
 136
 137         target_complete_cmd(cmd, GOOD);
 138         return 0;
 139 }
 140
 141 /*
 142  * REPORT_TARGET_PORT_GROUPS
 143  *
 144  * See spc4r17 section 6.27
 145  */
 146 sense_reason_t
 147 target_emulate_report_target_port_groups(struct se_cmd *cmd)
 148 {
 149         struct se_device *dev = cmd->se_dev;
 150         struct t10_alua_tg_pt_gp *tg_pt_gp;
 151         struct se_lun *lun;
 152         unsigned char *buf;
 153         u32 rd_len = 0, off;
 154         int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
 155
 156         /*
 157          * Skip over RESERVED area to first Target port group descriptor
 158          * depending on the PARAMETER DATA FORMAT type..
 159          */
 160         if (ext_hdr != 0)
 161                 off = 8;
 162         else
 163                 off = 4;
 164
 165         if (cmd->data_length < off) {
 166                 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
 167                         " small for %s header\n", cmd->data_length,
 168                         (ext_hdr) ? "extended" : "normal");
 169                 return TCM_INVALID_CDB_FIELD;
 170         }
 171         buf = transport_kmap_data_sg(cmd);
 172         if (!buf)
 173                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 174
 175         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 176         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
 177                         tg_pt_gp_list) {
 178                 /*
 179                  * Check if the Target port group and Target port descriptor list
 180                  * based on tg_pt_gp_members count will fit into the response payload.
 181                  * Otherwise, bump rd_len to let the initiator know we have exceeded
 182                  * the allocation length and the response is truncated.
 183                  */
 184                 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
 185                      cmd->data_length) {
 186                         rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
 187                         continue;
 188                 }
 189                 /*
 190                  * PREF: Preferred target port bit, determine if this
 191                  * bit should be set for port group.
 192                  */
 193                 if (tg_pt_gp->tg_pt_gp_pref)
 194                         buf[off] = 0x80;
 195                 /*
 196                  * Set the ASYMMETRIC ACCESS State
 197                  */
 198                 buf[off++] |= (atomic_read(
 199                         &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
 200                 /*
 201                  * Set supported ASYMMETRIC ACCESS State bits
 202                  */
 203                 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
 204                 /*
 205                  * TARGET PORT GROUP
 206                  */
 207                 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
 208                 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
 209
 210                 off++; /* Skip over Reserved */
 211                 /*
 212                  * STATUS CODE
 213                  */
 214                 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
 215                 /*
 216                  * Vendor Specific field
 217                  */
 218                 buf[off++] = 0x00;
 219                 /*
 220                  * TARGET PORT COUNT
 221                  */
 222                 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
 223                 rd_len += 8;
 224
 225                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 226                 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
 227                                 lun_tg_pt_gp_link) {
 228                         /*
 229                          * Start Target Port descriptor format
 230                          *
 231                          * See spc4r17 section 6.2.7 Table 247
 232                          */
 233                         off += 2; /* Skip over Obsolete */
 234                         /*
 235                          * Set RELATIVE TARGET PORT IDENTIFIER
 236                          */
 237                         buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
 238                         buf[off++] = (lun->lun_rtpi & 0xff);
 239                         rd_len += 4;
 240                 }
 241                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 242         }
 243         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 244         /*
 245          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 246          */
 247         put_unaligned_be32(rd_len, &buf[0]);
 248
 249         /*
 250          * Fill in the Extended header parameter data format if requested
 251          */
 252         if (ext_hdr != 0) {
 253                 buf[4] = 0x10;
 254                 /*
 255                  * Set the implicit transition time (in seconds) for the application
 256                  * client to use as a base for it's transition timeout value.
 257                  *
 258                  * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
 259                  * this CDB was received upon to determine this value individually
 260                  * for ALUA target port group.
 261                  */
 262                 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
 263                 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
 264                 if (tg_pt_gp)
 265                         buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
 266                 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
 267         }
 268         transport_kunmap_data_sg(cmd);
 269
 270         target_complete_cmd(cmd, GOOD);
 271         return 0;
 272 }
 273
 274 /*
 275  * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
 276  *
 277  * See spc4r17 section 6.35
 278  */
 279 sense_reason_t
 280 target_emulate_set_target_port_groups(struct se_cmd *cmd)
 281 {
 282         struct se_device *dev = cmd->se_dev;
 283         struct se_lun *l_lun = cmd->se_lun;
 284         struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
 285         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
 286         unsigned char *buf;
 287         unsigned char *ptr;
 288         sense_reason_t rc = TCM_NO_SENSE;
 289         u32 len = 4; /* Skip over RESERVED area in header */
 290         int alua_access_state, primary = 0, valid_states;
 291         u16 tg_pt_id, rtpi;
 292
 293         if (cmd->data_length < 4) {
 294                 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
 295                         " small\n", cmd->data_length);
 296                 return TCM_INVALID_PARAMETER_LIST;
 297         }
 298
 299         buf = transport_kmap_data_sg(cmd);
 300         if (!buf)
 301                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 302
 303         /*
 304          * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
 305          * for the local tg_pt_gp.
 306          */
 307         spin_lock(&l_lun->lun_tg_pt_gp_lock);
 308         l_tg_pt_gp = l_lun->lun_tg_pt_gp;
 309         if (!l_tg_pt_gp) {
 310                 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
 311                 pr_err("Unable to access l_lun->tg_pt_gp\n");
 312                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 313                 goto out;
 314         }
 315
 316         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
 317                 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
 318                 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
 319                                 " while TPGS_EXPLICIT_ALUA is disabled\n");
 320                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 321                 goto out;
 322         }
 323         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
 324         spin_unlock(&l_lun->lun_tg_pt_gp_lock);
 325
 326         ptr = &buf[4]; /* Skip over RESERVED area in header */
 327
 328         while (len < cmd->data_length) {
 329                 bool found = false;
 330                 alua_access_state = (ptr[0] & 0x0f);
 331                 /*
 332                  * Check the received ALUA access state, and determine if
 333                  * the state is a primary or secondary target port asymmetric
 334                  * access state.
 335                  */
 336                 rc = core_alua_check_transition(alua_access_state,
 337                                                 valid_states, &primary);
 338                 if (rc) {
 339                         /*
 340                          * If the SET TARGET PORT GROUPS attempts to establish
 341                          * an invalid combination of target port asymmetric
 342                          * access states or attempts to establish an
 343                          * unsupported target port asymmetric access state,
 344                          * then the command shall be terminated with CHECK
 345                          * CONDITION status, with the sense key set to ILLEGAL
 346                          * REQUEST, and the additional sense code set to INVALID
 347                          * FIELD IN PARAMETER LIST.
 348                          */
 349                         goto out;
 350                 }
 351
 352                 /*
 353                  * If the ASYMMETRIC ACCESS STATE field (see table 267)
 354                  * specifies a primary target port asymmetric access state,
 355                  * then the TARGET PORT GROUP OR TARGET PORT field specifies
 356                  * a primary target port group for which the primary target
 357                  * port asymmetric access state shall be changed. If the
 358                  * ASYMMETRIC ACCESS STATE field specifies a secondary target
 359                  * port asymmetric access state, then the TARGET PORT GROUP OR
 360                  * TARGET PORT field specifies the relative target port
 361                  * identifier (see 3.1.120) of the target port for which the
 362                  * secondary target port asymmetric access state shall be
 363                  * changed.
 364                  */
 365                 if (primary) {
 366                         tg_pt_id = get_unaligned_be16(ptr + 2);
 367                         /*
 368                          * Locate the matching target port group ID from
 369                          * the global tg_pt_gp list
 370                          */
 371                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 372                         list_for_each_entry(tg_pt_gp,
 373                                         &dev->t10_alua.tg_pt_gps_list,
 374                                         tg_pt_gp_list) {
 375                                 if (!tg_pt_gp->tg_pt_gp_valid_id)
 376                                         continue;
 377
 378                                 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
 379                                         continue;
 380
 381                                 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 382
 383                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 384
 385                                 if (!core_alua_do_port_transition(tg_pt_gp,
 386                                                 dev, l_lun, nacl,
 387                                                 alua_access_state, 1))
 388                                         found = true;
 389
 390                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 391                                 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 392                                 break;
 393                         }
 394                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 395                 } else {
 396                         struct se_lun *lun;
 397
 398                         /*
 399                          * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
 400                          * the Target Port in question for the the incoming
 401                          * SET_TARGET_PORT_GROUPS op.
 402                          */
 403                         rtpi = get_unaligned_be16(ptr + 2);
 404                         /*
 405                          * Locate the matching relative target port identifier
 406                          * for the struct se_device storage object.
 407                          */
 408                         spin_lock(&dev->se_port_lock);
 409                         list_for_each_entry(lun, &dev->dev_sep_list,
 410                                                         lun_dev_link) {
 411                                 if (lun->lun_rtpi != rtpi)
 412                                         continue;
 413
 414                                 // XXX: racy unlock
 415                                 spin_unlock(&dev->se_port_lock);
 416
 417                                 if (!core_alua_set_tg_pt_secondary_state(
 418                                                 lun, 1, 1))
 419                                         found = true;
 420
 421                                 spin_lock(&dev->se_port_lock);
 422                                 break;
 423                         }
 424                         spin_unlock(&dev->se_port_lock);
 425                 }
 426
 427                 if (!found) {
 428                         rc = TCM_INVALID_PARAMETER_LIST;
 429                         goto out;
 430                 }
 431
 432                 ptr += 4;
 433                 len += 4;
 434         }
 435
 436 out:
 437         transport_kunmap_data_sg(cmd);
 438         if (!rc)
 439                 target_complete_cmd(cmd, GOOD);
 440         return rc;
 441 }
 442
 443 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
 444 {
 445         /*
 446          * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 447          * The ALUA additional sense code qualifier (ASCQ) is determined
 448          * by the ALUA primary or secondary access state..
 449          */
 450         pr_debug("[%s]: ALUA TG Port not available, "
 451                 "SenseKey: NOT_READY, ASC/ASCQ: "
 452                 "0x04/0x%02x\n",
 453                 cmd->se_tfo->get_fabric_name(), alua_ascq);
 454
 455         cmd->scsi_asc = 0x04;
 456         cmd->scsi_ascq = alua_ascq;
 457 }
 458
 459 static inline void core_alua_state_nonoptimized(
 460         struct se_cmd *cmd,
 461         unsigned char *cdb,
 462         int nonop_delay_msecs)
 463 {
 464         /*
 465          * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
 466          * later to determine if processing of this cmd needs to be
 467          * temporarily delayed for the Active/NonOptimized primary access state.
 468          */
 469         cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
 470         cmd->alua_nonop_delay = nonop_delay_msecs;
 471 }
 472
 473 static inline int core_alua_state_lba_dependent(
 474         struct se_cmd *cmd,
 475         struct t10_alua_tg_pt_gp *tg_pt_gp)
 476 {
 477         struct se_device *dev = cmd->se_dev;
 478         u64 segment_size, segment_mult, sectors, lba;
 479
 480         /* Only need to check for cdb actually containing LBAs */
 481         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
 482                 return 0;
 483
 484         spin_lock(&dev->t10_alua.lba_map_lock);
 485         segment_size = dev->t10_alua.lba_map_segment_size;
 486         segment_mult = dev->t10_alua.lba_map_segment_multiplier;
 487         sectors = cmd->data_length / dev->dev_attrib.block_size;
 488
 489         lba = cmd->t_task_lba;
 490         while (lba < cmd->t_task_lba + sectors) {
 491                 struct t10_alua_lba_map *cur_map = NULL, *map;
 492                 struct t10_alua_lba_map_member *map_mem;
 493
 494                 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
 495                                     lba_map_list) {
 496                         u64 start_lba, last_lba;
 497                         u64 first_lba = map->lba_map_first_lba;
 498
 499                         if (segment_mult) {
 500                                 u64 tmp = lba;
 501                                 start_lba = do_div(tmp, segment_size * segment_mult);
 502
 503                                 last_lba = first_lba + segment_size - 1;
 504                                 if (start_lba >= first_lba &&
 505                                     start_lba <= last_lba) {
 506                                         lba += segment_size;
 507                                         cur_map = map;
 508                                         break;
 509                                 }
 510                         } else {
 511                                 last_lba = map->lba_map_last_lba;
 512                                 if (lba >= first_lba && lba <= last_lba) {
 513                                         lba = last_lba + 1;
 514                                         cur_map = map;
 515                                         break;
 516                                 }
 517                         }
 518                 }
 519                 if (!cur_map) {
 520                         spin_unlock(&dev->t10_alua.lba_map_lock);
 521                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 522                         return 1;
 523                 }
 524                 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
 525                                     lba_map_mem_list) {
 526                         if (map_mem->lba_map_mem_alua_pg_id !=
 527                             tg_pt_gp->tg_pt_gp_id)
 528                                 continue;
 529                         switch(map_mem->lba_map_mem_alua_state) {
 530                         case ALUA_ACCESS_STATE_STANDBY:
 531                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 532                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 533                                 return 1;
 534                         case ALUA_ACCESS_STATE_UNAVAILABLE:
 535                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 536                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 537                                 return 1;
 538                         default:
 539                                 break;
 540                         }
 541                 }
 542         }
 543         spin_unlock(&dev->t10_alua.lba_map_lock);
 544         return 0;
 545 }
 546
 547 static inline int core_alua_state_standby(
 548         struct se_cmd *cmd,
 549         unsigned char *cdb)
 550 {
 551         /*
 552          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 553          * spc4r17 section 5.9.2.4.4
 554          */
 555         switch (cdb[0]) {
 556         case INQUIRY:
 557         case LOG_SELECT:
 558         case LOG_SENSE:
 559         case MODE_SELECT:
 560         case MODE_SENSE:
 561         case REPORT_LUNS:
 562         case RECEIVE_DIAGNOSTIC:
 563         case SEND_DIAGNOSTIC:
 564         case READ_CAPACITY:
 565                 return 0;
 566         case SERVICE_ACTION_IN_16:
 567                 switch (cdb[1] & 0x1f) {
 568                 case SAI_READ_CAPACITY_16:
 569                         return 0;
 570                 default:
 571                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 572                         return 1;
 573                 }
 574         case MAINTENANCE_IN:
 575                 switch (cdb[1] & 0x1f) {
 576                 case MI_REPORT_TARGET_PGS:
 577                         return 0;
 578                 default:
 579                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 580                         return 1;
 581                 }
 582         case MAINTENANCE_OUT:
 583                 switch (cdb[1]) {
 584                 case MO_SET_TARGET_PGS:
 585                         return 0;
 586                 default:
 587                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 588                         return 1;
 589                 }
 590         case REQUEST_SENSE:
 591         case PERSISTENT_RESERVE_IN:
 592         case PERSISTENT_RESERVE_OUT:
 593         case READ_BUFFER:
 594         case WRITE_BUFFER:
 595                 return 0;
 596         default:
 597                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 598                 return 1;
 599         }
 600
 601         return 0;
 602 }
 603
 604 static inline int core_alua_state_unavailable(
 605         struct se_cmd *cmd,
 606         unsigned char *cdb)
 607 {
 608         /*
 609          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 610          * spc4r17 section 5.9.2.4.5
 611          */
 612         switch (cdb[0]) {
 613         case INQUIRY:
 614         case REPORT_LUNS:
 615                 return 0;
 616         case MAINTENANCE_IN:
 617                 switch (cdb[1] & 0x1f) {
 618                 case MI_REPORT_TARGET_PGS:
 619                         return 0;
 620                 default:
 621                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 622                         return 1;
 623                 }
 624         case MAINTENANCE_OUT:
 625                 switch (cdb[1]) {
 626                 case MO_SET_TARGET_PGS:
 627                         return 0;
 628                 default:
 629                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 630                         return 1;
 631                 }
 632         case REQUEST_SENSE:
 633         case READ_BUFFER:
 634         case WRITE_BUFFER:
 635                 return 0;
 636         default:
 637                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 638                 return 1;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static inline int core_alua_state_transition(
 645         struct se_cmd *cmd,
 646         unsigned char *cdb)
 647 {
 648         /*
 649          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
 650          * spc4r17 section 5.9.2.5
 651          */
 652         switch (cdb[0]) {
 653         case INQUIRY:
 654         case REPORT_LUNS:
 655                 return 0;
 656         case MAINTENANCE_IN:
 657                 switch (cdb[1] & 0x1f) {
 658                 case MI_REPORT_TARGET_PGS:
 659                         return 0;
 660                 default:
 661                         set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 662                         return 1;
 663                 }
 664         case REQUEST_SENSE:
 665         case READ_BUFFER:
 666         case WRITE_BUFFER:
 667                 return 0;
 668         default:
 669                 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 670                 return 1;
 671         }
 672
 673         return 0;
 674 }
 675
 676 /*
 677  * return 1: Is used to signal LUN not accessible, and check condition/not ready
 678  * return 0: Used to signal success
 679  * return -1: Used to signal failure, and invalid cdb field
 680  */
 681 sense_reason_t
 682 target_alua_state_check(struct se_cmd *cmd)
 683 {
 684         struct se_device *dev = cmd->se_dev;
 685         unsigned char *cdb = cmd->t_task_cdb;
 686         struct se_lun *lun = cmd->se_lun;
 687         struct t10_alua_tg_pt_gp *tg_pt_gp;
 688         int out_alua_state, nonop_delay_msecs;
 689
 690         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 691                 return 0;
 692         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
 693                 return 0;
 694
 695         /*
 696          * First, check for a struct se_port specific secondary ALUA target port
 697          * access state: OFFLINE
 698          */
 699         if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
 700                 pr_debug("ALUA: Got secondary offline status for local"
 701                                 " target port\n");
 702                 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
 703                 return TCM_CHECK_CONDITION_NOT_READY;
 704         }
 705
 706         if (!lun->lun_tg_pt_gp)
 707                 return 0;
 708
 709         spin_lock(&lun->lun_tg_pt_gp_lock);
 710         tg_pt_gp = lun->lun_tg_pt_gp;
 711         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 712         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 713
 714         // XXX: keeps using tg_pt_gp witout reference after unlock
 715         spin_unlock(&lun->lun_tg_pt_gp_lock);
 716         /*
 717          * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
 718          * statement so the compiler knows explicitly to check this case first.
 719          * For the Optimized ALUA access state case, we want to process the
 720          * incoming fabric cmd ASAP..
 721          */
 722         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
 723                 return 0;
 724
 725         switch (out_alua_state) {
 726         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 727                 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
 728                 break;
 729         case ALUA_ACCESS_STATE_STANDBY:
 730                 if (core_alua_state_standby(cmd, cdb))
 731                         return TCM_CHECK_CONDITION_NOT_READY;
 732                 break;
 733         case ALUA_ACCESS_STATE_UNAVAILABLE:
 734                 if (core_alua_state_unavailable(cmd, cdb))
 735                         return TCM_CHECK_CONDITION_NOT_READY;
 736                 break;
 737         case ALUA_ACCESS_STATE_TRANSITION:
 738                 if (core_alua_state_transition(cmd, cdb))
 739                         return TCM_CHECK_CONDITION_NOT_READY;
 740                 break;
 741         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 742                 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
 743                         return TCM_CHECK_CONDITION_NOT_READY;
 744                 break;
 745         /*
 746          * OFFLINE is a secondary ALUA target port group access state, that is
 747          * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
 748          */
 749         case ALUA_ACCESS_STATE_OFFLINE:
 750         default:
 751                 pr_err("Unknown ALUA access state: 0x%02x\n",
 752                                 out_alua_state);
 753                 return TCM_INVALID_CDB_FIELD;
 754         }
 755
 756         return 0;
 757 }
 758
 759 /*
 760  * Check implicit and explicit ALUA state change request.
 761  */
 762 static sense_reason_t
 763 core_alua_check_transition(int state, int valid, int *primary)
 764 {
 765         /*
 766          * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 767          * defined as primary target port asymmetric access states.
 768          */
 769         switch (state) {
 770         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 771                 if (!(valid & ALUA_AO_SUP))
 772                         goto not_supported;
 773                 *primary = 1;
 774                 break;
 775         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 776                 if (!(valid & ALUA_AN_SUP))
 777                         goto not_supported;
 778                 *primary = 1;
 779                 break;
 780         case ALUA_ACCESS_STATE_STANDBY:
 781                 if (!(valid & ALUA_S_SUP))
 782                         goto not_supported;
 783                 *primary = 1;
 784                 break;
 785         case ALUA_ACCESS_STATE_UNAVAILABLE:
 786                 if (!(valid & ALUA_U_SUP))
 787                         goto not_supported;
 788                 *primary = 1;
 789                 break;
 790         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 791                 if (!(valid & ALUA_LBD_SUP))
 792                         goto not_supported;
 793                 *primary = 1;
 794                 break;
 795         case ALUA_ACCESS_STATE_OFFLINE:
 796                 /*
 797                  * OFFLINE state is defined as a secondary target port
 798                  * asymmetric access state.
 799                  */
 800                 if (!(valid & ALUA_O_SUP))
 801                         goto not_supported;
 802                 *primary = 0;
 803                 break;
 804         case ALUA_ACCESS_STATE_TRANSITION:
 805                 /*
 806                  * Transitioning is set internally, and
 807                  * cannot be selected manually.
 808                  */
 809                 goto not_supported;
 810         default:
 811                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 812                 return TCM_INVALID_PARAMETER_LIST;
 813         }
 814
 815         return 0;
 816
 817 not_supported:
 818         pr_err("ALUA access state %s not supported",
 819                core_alua_dump_state(state));
 820         return TCM_INVALID_PARAMETER_LIST;
 821 }
 822
 823 static char *core_alua_dump_state(int state)
 824 {
 825         switch (state) {
 826         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 827                 return "Active/Optimized";
 828         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 829                 return "Active/NonOptimized";
 830         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 831                 return "LBA Dependent";
 832         case ALUA_ACCESS_STATE_STANDBY:
 833                 return "Standby";
 834         case ALUA_ACCESS_STATE_UNAVAILABLE:
 835                 return "Unavailable";
 836         case ALUA_ACCESS_STATE_OFFLINE:
 837                 return "Offline";
 838         case ALUA_ACCESS_STATE_TRANSITION:
 839                 return "Transitioning";
 840         default:
 841                 return "Unknown";
 842         }
 843
 844         return NULL;
 845 }
 846
 847 char *core_alua_dump_status(int status)
 848 {
 849         switch (status) {
 850         case ALUA_STATUS_NONE:
 851                 return "None";
 852         case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
 853                 return "Altered by Explicit STPG";
 854         case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
 855                 return "Altered by Implicit ALUA";
 856         default:
 857                 return "Unknown";
 858         }
 859
 860         return NULL;
 861 }
 862
 863 /*
 864  * Used by fabric modules to determine when we need to delay processing
 865  * for the Active/NonOptimized paths..
 866  */
 867 int core_alua_check_nonop_delay(
 868         struct se_cmd *cmd)
 869 {
 870         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 871                 return 0;
 872         if (in_interrupt())
 873                 return 0;
 874         /*
 875          * The ALUA Active/NonOptimized access state delay can be disabled
 876          * in via configfs with a value of zero
 877          */
 878         if (!cmd->alua_nonop_delay)
 879                 return 0;
 880         /*
 881          * struct se_cmd->alua_nonop_delay gets set by a target port group
 882          * defined interval in core_alua_state_nonoptimized()
 883          */
 884         msleep_interruptible(cmd->alua_nonop_delay);
 885         return 0;
 886 }
 887 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 888
 889 static int core_alua_write_tpg_metadata(
 890         const char *path,
 891         unsigned char *md_buf,
 892         u32 md_buf_len)
 893 {
 894         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 895         int ret;
 896
 897         if (IS_ERR(file)) {
 898                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 899                 return -ENODEV;
 900         }
 901         ret = kernel_write(file, md_buf, md_buf_len, 0);
 902         if (ret < 0)
 903                 pr_err("Error writing ALUA metadata file: %s\n", path);
 904         fput(file);
 905         return (ret < 0) ? -EIO : 0;
 906 }
 907
 908 /*
 909  * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 910  */
 911 static int core_alua_update_tpg_primary_metadata(
 912         struct t10_alua_tg_pt_gp *tg_pt_gp)
 913 {
 914         unsigned char *md_buf;
 915         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 916         char path[ALUA_METADATA_PATH_LEN];
 917         int len, rc;
 918
 919         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
 920         if (!md_buf) {
 921                 pr_err("Unable to allocate buf for ALUA metadata\n");
 922                 return -ENOMEM;
 923         }
 924
 925         memset(path, 0, ALUA_METADATA_PATH_LEN);
 926
 927         len = snprintf(md_buf, ALUA_MD_BUF_LEN,
 928                         "tg_pt_gp_id=%hu\n"
 929                         "alua_access_state=0x%02x\n"
 930                         "alua_access_status=0x%02x\n",
 931                         tg_pt_gp->tg_pt_gp_id,
 932                         tg_pt_gp->tg_pt_gp_alua_pending_state,
 933                         tg_pt_gp->tg_pt_gp_alua_access_status);
 934
 935         snprintf(path, ALUA_METADATA_PATH_LEN,
 936                 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
 937                 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 938
 939         rc = core_alua_write_tpg_metadata(path, md_buf, len);
 940         kfree(md_buf);
 941         return rc;
 942 }
 943
 944 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
 945 {
 946         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
 947                 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
 948         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
 949         struct se_dev_entry *se_deve;
 950         struct se_lun *lun;
 951         struct se_lun_acl *lacl;
 952         bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
 953                          ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
 954
 955         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 956         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
 957                                 lun_tg_pt_gp_link) {
 958                 /*
 959                  * After an implicit target port asymmetric access state
 960                  * change, a device server shall establish a unit attention
 961                  * condition for the initiator port associated with every I_T
 962                  * nexus with the additional sense code set to ASYMMETRIC
 963                  * ACCESS STATE CHANGED.
 964                  *
 965                  * After an explicit target port asymmetric access state
 966                  * change, a device server shall establish a unit attention
 967                  * condition with the additional sense code set to ASYMMETRIC
 968                  * ACCESS STATE CHANGED for the initiator port associated with
 969                  * every I_T nexus other than the I_T nexus on which the SET
 970                  * TARGET PORT GROUPS command
 971                  */
 972                 atomic_inc_mb(&lun->lun_active);
 973                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 974
 975                 spin_lock_bh(&lun->lun_deve_lock);
 976                 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
 977                         lacl = rcu_dereference_check(se_deve->se_lun_acl,
 978                                         lockdep_is_held(&lun->lun_deve_lock));
 979                         /*
 980                          * se_deve->se_lun_acl pointer may be NULL for a
 981                          * entry created without explicit Node+MappedLUN ACLs
 982                          */
 983                         if (!lacl)
 984                                 continue;
 985
 986                         if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
 987                              ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
 988                            (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
 989                             (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
 990                            (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
 991                             (tg_pt_gp->tg_pt_gp_alua_lun == lun))
 992                                 continue;
 993
 994                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
 995                                 se_deve->mapped_lun, 0x2A,
 996                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
 997                 }
 998                 spin_unlock_bh(&lun->lun_deve_lock);
 999
1000                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1001                 atomic_dec_mb(&lun->lun_active);
1002         }
1003         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1004         /*
1005          * Update the ALUA metadata buf that has been allocated in
1006          * core_alua_do_port_transition(), this metadata will be written
1007          * to struct file.
1008          *
1009          * Note that there is the case where we do not want to update the
1010          * metadata when the saved metadata is being parsed in userspace
1011          * when setting the existing port access state and access status.
1012          *
1013          * Also note that the failure to write out the ALUA metadata to
1014          * struct file does NOT affect the actual ALUA transition.
1015          */
1016         if (tg_pt_gp->tg_pt_gp_write_metadata) {
1017                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1018                 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1019                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1020         }
1021         /*
1022          * Set the current primary ALUA access state to the requested new state
1023          */
1024         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1025                    tg_pt_gp->tg_pt_gp_alua_pending_state);
1026
1027         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1028                 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1029                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1030                 tg_pt_gp->tg_pt_gp_id,
1031                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1032                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1033         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1034         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1035         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1036
1037         if (tg_pt_gp->tg_pt_gp_transition_complete)
1038                 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1039 }
1040
1041 static int core_alua_do_transition_tg_pt(
1042         struct t10_alua_tg_pt_gp *tg_pt_gp,
1043         int new_state,
1044         int explicit)
1045 {
1046         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1047         DECLARE_COMPLETION_ONSTACK(wait);
1048
1049         /* Nothing to be done here */
1050         if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1051                 return 0;
1052
1053         if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1054                 return -EAGAIN;
1055
1056         /*
1057          * Flush any pending transitions
1058          */
1059         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1060             atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1061             ALUA_ACCESS_STATE_TRANSITION) {
1062                 /* Just in case */
1063                 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1064                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1065                 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1066                 wait_for_completion(&wait);
1067                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1068                 return 0;
1069         }
1070
1071         /*
1072          * Save the old primary ALUA access state, and set the current state
1073          * to ALUA_ACCESS_STATE_TRANSITION.
1074          */
1075         tg_pt_gp->tg_pt_gp_alua_previous_state =
1076                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1077         tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1078
1079         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1080                         ALUA_ACCESS_STATE_TRANSITION);
1081         tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1082                                 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1083                                 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1084
1085         /*
1086          * Check for the optional ALUA primary state transition delay
1087          */
1088         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1089                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1090
1091         /*
1092          * Take a reference for workqueue item
1093          */
1094         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1095         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1096         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1097
1098         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1099                 unsigned long transition_tmo;
1100
1101                 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1102                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1103                                    &tg_pt_gp->tg_pt_gp_transition_work,
1104                                    transition_tmo);
1105         } else {
1106                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1107                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1108                                    &tg_pt_gp->tg_pt_gp_transition_work, 0);
1109                 wait_for_completion(&wait);
1110                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1111         }
1112
1113         return 0;
1114 }
1115
1116 int core_alua_do_port_transition(
1117         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1118         struct se_device *l_dev,
1119         struct se_lun *l_lun,
1120         struct se_node_acl *l_nacl,
1121         int new_state,
1122         int explicit)
1123 {
1124         struct se_device *dev;
1125         struct t10_alua_lu_gp *lu_gp;
1126         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1127         struct t10_alua_tg_pt_gp *tg_pt_gp;
1128         int primary, valid_states, rc = 0;
1129
1130         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1131         if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1132                 return -EINVAL;
1133
1134         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1135         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1136         lu_gp = local_lu_gp_mem->lu_gp;
1137         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1138         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1139         /*
1140          * For storage objects that are members of the 'default_lu_gp',
1141          * we only do transition on the passed *l_tp_pt_gp, and not
1142          * on all of the matching target port groups IDs in default_lu_gp.
1143          */
1144         if (!lu_gp->lu_gp_id) {
1145                 /*
1146                  * core_alua_do_transition_tg_pt() will always return
1147                  * success.
1148                  */
1149                 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1150                 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1151                 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1152                                                    new_state, explicit);
1153                 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1154                 return rc;
1155         }
1156         /*
1157          * For all other LU groups aside from 'default_lu_gp', walk all of
1158          * the associated storage objects looking for a matching target port
1159          * group ID from the local target port group.
1160          */
1161         spin_lock(&lu_gp->lu_gp_lock);
1162         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1163                                 lu_gp_mem_list) {
1164
1165                 dev = lu_gp_mem->lu_gp_mem_dev;
1166                 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1167                 spin_unlock(&lu_gp->lu_gp_lock);
1168
1169                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1170                 list_for_each_entry(tg_pt_gp,
1171                                 &dev->t10_alua.tg_pt_gps_list,
1172                                 tg_pt_gp_list) {
1173
1174                         if (!tg_pt_gp->tg_pt_gp_valid_id)
1175                                 continue;
1176                         /*
1177                          * If the target behavior port asymmetric access state
1178                          * is changed for any target port group accessible via
1179                          * a logical unit within a LU group, the target port
1180                          * behavior group asymmetric access states for the same
1181                          * target port group accessible via other logical units
1182                          * in that LU group will also change.
1183                          */
1184                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1185                                 continue;
1186
1187                         if (l_tg_pt_gp == tg_pt_gp) {
1188                                 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1189                                 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1190                         } else {
1191                                 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1192                                 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1193                         }
1194                         atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1195                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1196                         /*
1197                          * core_alua_do_transition_tg_pt() will always return
1198                          * success.
1199                          */
1200                         rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1201                                         new_state, explicit);
1202
1203                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1204                         atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1205                         if (rc)
1206                                 break;
1207                 }
1208                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1209
1210                 spin_lock(&lu_gp->lu_gp_lock);
1211                 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1212         }
1213         spin_unlock(&lu_gp->lu_gp_lock);
1214
1215         if (!rc) {
1216                 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1217                          " Group IDs: %hu %s transition to primary state: %s\n",
1218                          config_item_name(&lu_gp->lu_gp_group.cg_item),
1219                          l_tg_pt_gp->tg_pt_gp_id,
1220                          (explicit) ? "explicit" : "implicit",
1221                          core_alua_dump_state(new_state));
1222         }
1223
1224         atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1225         return rc;
1226 }
1227
1228 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1229 {
1230         struct se_portal_group *se_tpg = lun->lun_tpg;
1231         unsigned char *md_buf;
1232         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1233         int len, rc;
1234
1235         mutex_lock(&lun->lun_tg_pt_md_mutex);
1236
1237         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1238         if (!md_buf) {
1239                 pr_err("Unable to allocate buf for ALUA metadata\n");
1240                 rc = -ENOMEM;
1241                 goto out_unlock;
1242         }
1243
1244         memset(path, 0, ALUA_METADATA_PATH_LEN);
1245         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1246
1247         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1248                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1249
1250         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1251                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1252                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1253
1254         len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1255                         "alua_tg_pt_status=0x%02x\n",
1256                         atomic_read(&lun->lun_tg_pt_secondary_offline),
1257                         lun->lun_tg_pt_secondary_stat);
1258
1259         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1260                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1261                         lun->unpacked_lun);
1262
1263         rc = core_alua_write_tpg_metadata(path, md_buf, len);
1264         kfree(md_buf);
1265
1266 out_unlock:
1267         mutex_unlock(&lun->lun_tg_pt_md_mutex);
1268         return rc;
1269 }
1270
1271 static int core_alua_set_tg_pt_secondary_state(
1272         struct se_lun *lun,
1273         int explicit,
1274         int offline)
1275 {
1276         struct t10_alua_tg_pt_gp *tg_pt_gp;
1277         int trans_delay_msecs;
1278
1279         spin_lock(&lun->lun_tg_pt_gp_lock);
1280         tg_pt_gp = lun->lun_tg_pt_gp;
1281         if (!tg_pt_gp) {
1282                 spin_unlock(&lun->lun_tg_pt_gp_lock);
1283                 pr_err("Unable to complete secondary state"
1284                                 " transition\n");
1285                 return -EINVAL;
1286         }
1287         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1288         /*
1289          * Set the secondary ALUA target port access state to OFFLINE
1290          * or release the previously secondary state for struct se_lun
1291          */
1292         if (offline)
1293                 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1294         else
1295                 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1296
1297         lun->lun_tg_pt_secondary_stat = (explicit) ?
1298                         ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1299                         ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1300
1301         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1302                 " to secondary access state: %s\n", (explicit) ? "explicit" :
1303                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1304                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1305
1306         spin_unlock(&lun->lun_tg_pt_gp_lock);
1307         /*
1308          * Do the optional transition delay after we set the secondary
1309          * ALUA access state.
1310          */
1311         if (trans_delay_msecs != 0)
1312                 msleep_interruptible(trans_delay_msecs);
1313         /*
1314          * See if we need to update the ALUA fabric port metadata for
1315          * secondary state and status
1316          */
1317         if (lun->lun_tg_pt_secondary_write_md)
1318                 core_alua_update_tpg_secondary_metadata(lun);
1319
1320         return 0;
1321 }
1322
1323 struct t10_alua_lba_map *
1324 core_alua_allocate_lba_map(struct list_head *list,
1325                            u64 first_lba, u64 last_lba)
1326 {
1327         struct t10_alua_lba_map *lba_map;
1328
1329         lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1330         if (!lba_map) {
1331                 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1332                 return ERR_PTR(-ENOMEM);
1333         }
1334         INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1335         lba_map->lba_map_first_lba = first_lba;
1336         lba_map->lba_map_last_lba = last_lba;
1337
1338         list_add_tail(&lba_map->lba_map_list, list);
1339         return lba_map;
1340 }
1341
1342 int
1343 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1344                                int pg_id, int state)
1345 {
1346         struct t10_alua_lba_map_member *lba_map_mem;
1347
1348         list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1349                             lba_map_mem_list) {
1350                 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1351                         pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1352                         return -EINVAL;
1353                 }
1354         }
1355
1356         lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1357         if (!lba_map_mem) {
1358                 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1359                 return -ENOMEM;
1360         }
1361         lba_map_mem->lba_map_mem_alua_state = state;
1362         lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1363
1364         list_add_tail(&lba_map_mem->lba_map_mem_list,
1365                       &lba_map->lba_map_mem_list);
1366         return 0;
1367 }
1368
1369 void
1370 core_alua_free_lba_map(struct list_head *lba_list)
1371 {
1372         struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1373         struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1374
1375         list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1376                                  lba_map_list) {
1377                 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1378                                          &lba_map->lba_map_mem_list,
1379                                          lba_map_mem_list) {
1380                         list_del(&lba_map_mem->lba_map_mem_list);
1381                         kmem_cache_free(t10_alua_lba_map_mem_cache,
1382                                         lba_map_mem);
1383                 }
1384                 list_del(&lba_map->lba_map_list);
1385                 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1386         }
1387 }
1388
1389 void
1390 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1391                       int segment_size, int segment_mult)
1392 {
1393         struct list_head old_lba_map_list;
1394         struct t10_alua_tg_pt_gp *tg_pt_gp;
1395         int activate = 0, supported;
1396
1397         INIT_LIST_HEAD(&old_lba_map_list);
1398         spin_lock(&dev->t10_alua.lba_map_lock);
1399         dev->t10_alua.lba_map_segment_size = segment_size;
1400         dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1401         list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1402         if (lba_map_list) {
1403                 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1404                 activate = 1;
1405         }
1406         spin_unlock(&dev->t10_alua.lba_map_lock);
1407         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1408         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1409                             tg_pt_gp_list) {
1410
1411                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1412                         continue;
1413                 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1414                 if (activate)
1415                         supported |= ALUA_LBD_SUP;
1416                 else
1417                         supported &= ~ALUA_LBD_SUP;
1418                 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1419         }
1420         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1421         core_alua_free_lba_map(&old_lba_map_list);
1422 }
1423
1424 struct t10_alua_lu_gp *
1425 core_alua_allocate_lu_gp(const char *name, int def_group)
1426 {
1427         struct t10_alua_lu_gp *lu_gp;
1428
1429         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1430         if (!lu_gp) {
1431                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1432                 return ERR_PTR(-ENOMEM);
1433         }
1434         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1435         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1436         spin_lock_init(&lu_gp->lu_gp_lock);
1437         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1438
1439         if (def_group) {
1440                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1441                 lu_gp->lu_gp_valid_id = 1;
1442                 alua_lu_gps_count++;
1443         }
1444
1445         return lu_gp;
1446 }
1447
1448 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1449 {
1450         struct t10_alua_lu_gp *lu_gp_tmp;
1451         u16 lu_gp_id_tmp;
1452         /*
1453          * The lu_gp->lu_gp_id may only be set once..
1454          */
1455         if (lu_gp->lu_gp_valid_id) {
1456                 pr_warn("ALUA LU Group already has a valid ID,"
1457                         " ignoring request\n");
1458                 return -EINVAL;
1459         }
1460
1461         spin_lock(&lu_gps_lock);
1462         if (alua_lu_gps_count == 0x0000ffff) {
1463                 pr_err("Maximum ALUA alua_lu_gps_count:"
1464                                 " 0x0000ffff reached\n");
1465                 spin_unlock(&lu_gps_lock);
1466                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1467                 return -ENOSPC;
1468         }
1469 again:
1470         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1471                                 alua_lu_gps_counter++;
1472
1473         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1474                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1475                         if (!lu_gp_id)
1476                                 goto again;
1477
1478                         pr_warn("ALUA Logical Unit Group ID: %hu"
1479                                 " already exists, ignoring request\n",
1480                                 lu_gp_id);
1481                         spin_unlock(&lu_gps_lock);
1482                         return -EINVAL;
1483                 }
1484         }
1485
1486         lu_gp->lu_gp_id = lu_gp_id_tmp;
1487         lu_gp->lu_gp_valid_id = 1;
1488         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1489         alua_lu_gps_count++;
1490         spin_unlock(&lu_gps_lock);
1491
1492         return 0;
1493 }
1494
1495 static struct t10_alua_lu_gp_member *
1496 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1497 {
1498         struct t10_alua_lu_gp_member *lu_gp_mem;
1499
1500         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1501         if (!lu_gp_mem) {
1502                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1503                 return ERR_PTR(-ENOMEM);
1504         }
1505         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1506         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1507         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1508
1509         lu_gp_mem->lu_gp_mem_dev = dev;
1510         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1511
1512         return lu_gp_mem;
1513 }
1514
1515 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1516 {
1517         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1518         /*
1519          * Once we have reached this point, config_item_put() has
1520          * already been called from target_core_alua_drop_lu_gp().
1521          *
1522          * Here, we remove the *lu_gp from the global list so that
1523          * no associations can be made while we are releasing
1524          * struct t10_alua_lu_gp.
1525          */
1526         spin_lock(&lu_gps_lock);
1527         list_del(&lu_gp->lu_gp_node);
1528         alua_lu_gps_count--;
1529         spin_unlock(&lu_gps_lock);
1530         /*
1531          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1532          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1533          * released with core_alua_put_lu_gp_from_name()
1534          */
1535         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1536                 cpu_relax();
1537         /*
1538          * Release reference to struct t10_alua_lu_gp * from all associated
1539          * struct se_device.
1540          */
1541         spin_lock(&lu_gp->lu_gp_lock);
1542         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1543                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1544                 if (lu_gp_mem->lu_gp_assoc) {
1545                         list_del(&lu_gp_mem->lu_gp_mem_list);
1546                         lu_gp->lu_gp_members--;
1547                         lu_gp_mem->lu_gp_assoc = 0;
1548                 }
1549                 spin_unlock(&lu_gp->lu_gp_lock);
1550                 /*
1551                  *
1552                  * lu_gp_mem is associated with a single
1553                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1554                  * struct se_device is released via core_alua_free_lu_gp_mem().
1555                  *
1556                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1557                  * we want to re-associate a given lu_gp_mem with default_lu_gp.
1558                  */
1559                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1560                 if (lu_gp != default_lu_gp)
1561                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1562                                         default_lu_gp);
1563                 else
1564                         lu_gp_mem->lu_gp = NULL;
1565                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1566
1567                 spin_lock(&lu_gp->lu_gp_lock);
1568         }
1569         spin_unlock(&lu_gp->lu_gp_lock);
1570
1571         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1572 }
1573
1574 void core_alua_free_lu_gp_mem(struct se_device *dev)
1575 {
1576         struct t10_alua_lu_gp *lu_gp;
1577         struct t10_alua_lu_gp_member *lu_gp_mem;
1578
1579         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1580         if (!lu_gp_mem)
1581                 return;
1582
1583         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1584                 cpu_relax();
1585
1586         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1587         lu_gp = lu_gp_mem->lu_gp;
1588         if (lu_gp) {
1589                 spin_lock(&lu_gp->lu_gp_lock);
1590                 if (lu_gp_mem->lu_gp_assoc) {
1591                         list_del(&lu_gp_mem->lu_gp_mem_list);
1592                         lu_gp->lu_gp_members--;
1593                         lu_gp_mem->lu_gp_assoc = 0;
1594                 }
1595                 spin_unlock(&lu_gp->lu_gp_lock);
1596                 lu_gp_mem->lu_gp = NULL;
1597         }
1598         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1599
1600         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1601 }
1602
1603 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1604 {
1605         struct t10_alua_lu_gp *lu_gp;
1606         struct config_item *ci;
1607
1608         spin_lock(&lu_gps_lock);
1609         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1610                 if (!lu_gp->lu_gp_valid_id)
1611                         continue;
1612                 ci = &lu_gp->lu_gp_group.cg_item;
1613                 if (!strcmp(config_item_name(ci), name)) {
1614                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1615                         spin_unlock(&lu_gps_lock);
1616                         return lu_gp;
1617                 }
1618         }
1619         spin_unlock(&lu_gps_lock);
1620
1621         return NULL;
1622 }
1623
1624 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1625 {
1626         spin_lock(&lu_gps_lock);
1627         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1628         spin_unlock(&lu_gps_lock);
1629 }
1630
1631 /*
1632  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1633  */
1634 void __core_alua_attach_lu_gp_mem(
1635         struct t10_alua_lu_gp_member *lu_gp_mem,
1636         struct t10_alua_lu_gp *lu_gp)
1637 {
1638         spin_lock(&lu_gp->lu_gp_lock);
1639         lu_gp_mem->lu_gp = lu_gp;
1640         lu_gp_mem->lu_gp_assoc = 1;
1641         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1642         lu_gp->lu_gp_members++;
1643         spin_unlock(&lu_gp->lu_gp_lock);
1644 }
1645
1646 /*
1647  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1648  */
1649 void __core_alua_drop_lu_gp_mem(
1650         struct t10_alua_lu_gp_member *lu_gp_mem,
1651         struct t10_alua_lu_gp *lu_gp)
1652 {
1653         spin_lock(&lu_gp->lu_gp_lock);
1654         list_del(&lu_gp_mem->lu_gp_mem_list);
1655         lu_gp_mem->lu_gp = NULL;
1656         lu_gp_mem->lu_gp_assoc = 0;
1657         lu_gp->lu_gp_members--;
1658         spin_unlock(&lu_gp->lu_gp_lock);
1659 }
1660
1661 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1662                 const char *name, int def_group)
1663 {
1664         struct t10_alua_tg_pt_gp *tg_pt_gp;
1665
1666         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1667         if (!tg_pt_gp) {
1668                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1669                 return NULL;
1670         }
1671         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1672         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1673         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1674         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1675         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1676         INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1677                           core_alua_do_transition_tg_pt_work);
1678         tg_pt_gp->tg_pt_gp_dev = dev;
1679         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1680                 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1681         /*
1682          * Enable both explicit and implicit ALUA support by default
1683          */
1684         tg_pt_gp->tg_pt_gp_alua_access_type =
1685                         TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1686         /*
1687          * Set the default Active/NonOptimized Delay in milliseconds
1688          */
1689         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1690         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1691         tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1692
1693         /*
1694          * Enable all supported states
1695          */
1696         tg_pt_gp->tg_pt_gp_alua_supported_states =
1697             ALUA_T_SUP | ALUA_O_SUP |
1698             ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1699
1700         if (def_group) {
1701                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1702                 tg_pt_gp->tg_pt_gp_id =
1703                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1704                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1705                 dev->t10_alua.alua_tg_pt_gps_count++;
1706                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1707                               &dev->t10_alua.tg_pt_gps_list);
1708                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1709         }
1710
1711         return tg_pt_gp;
1712 }
1713
1714 int core_alua_set_tg_pt_gp_id(
1715         struct t10_alua_tg_pt_gp *tg_pt_gp,
1716         u16 tg_pt_gp_id)
1717 {
1718         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1719         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1720         u16 tg_pt_gp_id_tmp;
1721
1722         /*
1723          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1724          */
1725         if (tg_pt_gp->tg_pt_gp_valid_id) {
1726                 pr_warn("ALUA TG PT Group already has a valid ID,"
1727                         " ignoring request\n");
1728                 return -EINVAL;
1729         }
1730
1731         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1732         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1733                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1734                         " 0x0000ffff reached\n");
1735                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1736                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1737                 return -ENOSPC;
1738         }
1739 again:
1740         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1741                         dev->t10_alua.alua_tg_pt_gps_counter++;
1742
1743         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1744                         tg_pt_gp_list) {
1745                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1746                         if (!tg_pt_gp_id)
1747                                 goto again;
1748
1749                         pr_err("ALUA Target Port Group ID: %hu already"
1750                                 " exists, ignoring request\n", tg_pt_gp_id);
1751                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1752                         return -EINVAL;
1753                 }
1754         }
1755
1756         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1757         tg_pt_gp->tg_pt_gp_valid_id = 1;
1758         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1759                         &dev->t10_alua.tg_pt_gps_list);
1760         dev->t10_alua.alua_tg_pt_gps_count++;
1761         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1762
1763         return 0;
1764 }
1765
1766 void core_alua_free_tg_pt_gp(
1767         struct t10_alua_tg_pt_gp *tg_pt_gp)
1768 {
1769         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1770         struct se_lun *lun, *next;
1771
1772         /*
1773          * Once we have reached this point, config_item_put() has already
1774          * been called from target_core_alua_drop_tg_pt_gp().
1775          *
1776          * Here we remove *tg_pt_gp from the global list so that
1777          * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1778          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1779          */
1780         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1781         list_del(&tg_pt_gp->tg_pt_gp_list);
1782         dev->t10_alua.alua_tg_pt_gps_counter--;
1783         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1784
1785         flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1786
1787         /*
1788          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1789          * core_alua_get_tg_pt_gp_by_name() in
1790          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1791          * to be released with core_alua_put_tg_pt_gp_from_name().
1792          */
1793         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1794                 cpu_relax();
1795
1796         /*
1797          * Release reference to struct t10_alua_tg_pt_gp from all associated
1798          * struct se_port.
1799          */
1800         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1801         list_for_each_entry_safe(lun, next,
1802                         &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1803                 list_del_init(&lun->lun_tg_pt_gp_link);
1804                 tg_pt_gp->tg_pt_gp_members--;
1805
1806                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1807                 /*
1808                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1809                  * assume we want to re-associate a given tg_pt_gp_mem with
1810                  * default_tg_pt_gp.
1811                  */
1812                 spin_lock(&lun->lun_tg_pt_gp_lock);
1813                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1814                         __target_attach_tg_pt_gp(lun,
1815                                         dev->t10_alua.default_tg_pt_gp);
1816                 } else
1817                         lun->lun_tg_pt_gp = NULL;
1818                 spin_unlock(&lun->lun_tg_pt_gp_lock);
1819
1820                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1821         }
1822         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1823
1824         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1825 }
1826
1827 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1828                 struct se_device *dev, const char *name)
1829 {
1830         struct t10_alua_tg_pt_gp *tg_pt_gp;
1831         struct config_item *ci;
1832
1833         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1834         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1835                         tg_pt_gp_list) {
1836                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1837                         continue;
1838                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1839                 if (!strcmp(config_item_name(ci), name)) {
1840                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1841                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1842                         return tg_pt_gp;
1843                 }
1844         }
1845         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1846
1847         return NULL;
1848 }
1849
1850 static void core_alua_put_tg_pt_gp_from_name(
1851         struct t10_alua_tg_pt_gp *tg_pt_gp)
1852 {
1853         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1854
1855         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1856         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1857         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1858 }
1859
1860 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1861                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1862 {
1863         assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1864
1865         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1866         lun->lun_tg_pt_gp = tg_pt_gp;
1867         list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1868         tg_pt_gp->tg_pt_gp_members++;
1869         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1870 }
1871
1872 void target_attach_tg_pt_gp(struct se_lun *lun,
1873                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1874 {
1875         spin_lock(&lun->lun_tg_pt_gp_lock);
1876         __target_attach_tg_pt_gp(lun, tg_pt_gp);
1877         spin_unlock(&lun->lun_tg_pt_gp_lock);
1878 }
1879
1880 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1881                 struct t10_alua_tg_pt_gp *tg_pt_gp)
1882 {
1883         assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1884
1885         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1886         list_del_init(&lun->lun_tg_pt_gp_link);
1887         tg_pt_gp->tg_pt_gp_members--;
1888         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1889
1890         lun->lun_tg_pt_gp = NULL;
1891 }
1892
1893 void target_detach_tg_pt_gp(struct se_lun *lun)
1894 {
1895         struct t10_alua_tg_pt_gp *tg_pt_gp;
1896
1897         spin_lock(&lun->lun_tg_pt_gp_lock);
1898         tg_pt_gp = lun->lun_tg_pt_gp;
1899         if (tg_pt_gp)
1900                 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1901         spin_unlock(&lun->lun_tg_pt_gp_lock);
1902 }
1903
1904 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1905 {
1906         struct config_item *tg_pt_ci;
1907         struct t10_alua_tg_pt_gp *tg_pt_gp;
1908         ssize_t len = 0;
1909
1910         spin_lock(&lun->lun_tg_pt_gp_lock);
1911         tg_pt_gp = lun->lun_tg_pt_gp;
1912         if (tg_pt_gp) {
1913                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1914                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1915                         " %hu\nTG Port Primary Access State: %s\nTG Port "
1916                         "Primary Access Status: %s\nTG Port Secondary Access"
1917                         " State: %s\nTG Port Secondary Access Status: %s\n",
1918                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1919                         core_alua_dump_state(atomic_read(
1920                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
1921                         core_alua_dump_status(
1922                                 tg_pt_gp->tg_pt_gp_alua_access_status),
1923                         atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1924                         "Offline" : "None",
1925                         core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1926         }
1927         spin_unlock(&lun->lun_tg_pt_gp_lock);
1928
1929         return len;
1930 }
1931
1932 ssize_t core_alua_store_tg_pt_gp_info(
1933         struct se_lun *lun,
1934         const char *page,
1935         size_t count)
1936 {
1937         struct se_portal_group *tpg = lun->lun_tpg;
1938         struct se_device *dev = lun->lun_se_dev;
1939         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1940         unsigned char buf[TG_PT_GROUP_NAME_BUF];
1941         int move = 0;
1942
1943         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
1944             (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1945                 return -ENODEV;
1946
1947         if (count > TG_PT_GROUP_NAME_BUF) {
1948                 pr_err("ALUA Target Port Group alias too large!\n");
1949                 return -EINVAL;
1950         }
1951         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1952         memcpy(buf, page, count);
1953         /*
1954          * Any ALUA target port group alias besides "NULL" means we will be
1955          * making a new group association.
1956          */
1957         if (strcmp(strstrip(buf), "NULL")) {
1958                 /*
1959                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
1960                  * struct t10_alua_tg_pt_gp.  This reference is released with
1961                  * core_alua_put_tg_pt_gp_from_name() below.
1962                  */
1963                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1964                                         strstrip(buf));
1965                 if (!tg_pt_gp_new)
1966                         return -ENODEV;
1967         }
1968
1969         spin_lock(&lun->lun_tg_pt_gp_lock);
1970         tg_pt_gp = lun->lun_tg_pt_gp;
1971         if (tg_pt_gp) {
1972                 /*
1973                  * Clearing an existing tg_pt_gp association, and replacing
1974                  * with the default_tg_pt_gp.
1975                  */
1976                 if (!tg_pt_gp_new) {
1977                         pr_debug("Target_Core_ConfigFS: Moving"
1978                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1979                                 " alua/%s, ID: %hu back to"
1980                                 " default_tg_pt_gp\n",
1981                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1982                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1983                                 config_item_name(&lun->lun_group.cg_item),
1984                                 config_item_name(
1985                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
1986                                 tg_pt_gp->tg_pt_gp_id);
1987
1988                         __target_detach_tg_pt_gp(lun, tg_pt_gp);
1989                         __target_attach_tg_pt_gp(lun,
1990                                         dev->t10_alua.default_tg_pt_gp);
1991                         spin_unlock(&lun->lun_tg_pt_gp_lock);
1992
1993                         return count;
1994                 }
1995                 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1996                 move = 1;
1997         }
1998
1999         __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
2000         spin_unlock(&lun->lun_tg_pt_gp_lock);
2001         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2002                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2003                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2004                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2005                 config_item_name(&lun->lun_group.cg_item),
2006                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2007                 tg_pt_gp_new->tg_pt_gp_id);
2008
2009         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2010         return count;
2011 }
2012
2013 ssize_t core_alua_show_access_type(
2014         struct t10_alua_tg_pt_gp *tg_pt_gp,
2015         char *page)
2016 {
2017         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2018             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2019                 return sprintf(page, "Implicit and Explicit\n");
2020         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2021                 return sprintf(page, "Implicit\n");
2022         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2023                 return sprintf(page, "Explicit\n");
2024         else
2025                 return sprintf(page, "None\n");
2026 }
2027
2028 ssize_t core_alua_store_access_type(
2029         struct t10_alua_tg_pt_gp *tg_pt_gp,
2030         const char *page,
2031         size_t count)
2032 {
2033         unsigned long tmp;
2034         int ret;
2035
2036         ret = kstrtoul(page, 0, &tmp);
2037         if (ret < 0) {
2038                 pr_err("Unable to extract alua_access_type\n");
2039                 return ret;
2040         }
2041         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2042                 pr_err("Illegal value for alua_access_type:"
2043                                 " %lu\n", tmp);
2044                 return -EINVAL;
2045         }
2046         if (tmp == 3)
2047                 tg_pt_gp->tg_pt_gp_alua_access_type =
2048                         TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2049         else if (tmp == 2)
2050                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2051         else if (tmp == 1)
2052                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2053         else
2054                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2055
2056         return count;
2057 }
2058
2059 ssize_t core_alua_show_nonop_delay_msecs(
2060         struct t10_alua_tg_pt_gp *tg_pt_gp,
2061         char *page)
2062 {
2063         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2064 }
2065
2066 ssize_t core_alua_store_nonop_delay_msecs(
2067         struct t10_alua_tg_pt_gp *tg_pt_gp,
2068         const char *page,
2069         size_t count)
2070 {
2071         unsigned long tmp;
2072         int ret;
2073
2074         ret = kstrtoul(page, 0, &tmp);
2075         if (ret < 0) {
2076                 pr_err("Unable to extract nonop_delay_msecs\n");
2077                 return ret;
2078         }
2079         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2080                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2081                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2082                         ALUA_MAX_NONOP_DELAY_MSECS);
2083                 return -EINVAL;
2084         }
2085         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2086
2087         return count;
2088 }
2089
2090 ssize_t core_alua_show_trans_delay_msecs(
2091         struct t10_alua_tg_pt_gp *tg_pt_gp,
2092         char *page)
2093 {
2094         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2095 }
2096
2097 ssize_t core_alua_store_trans_delay_msecs(
2098         struct t10_alua_tg_pt_gp *tg_pt_gp,
2099         const char *page,
2100         size_t count)
2101 {
2102         unsigned long tmp;
2103         int ret;
2104
2105         ret = kstrtoul(page, 0, &tmp);
2106         if (ret < 0) {
2107                 pr_err("Unable to extract trans_delay_msecs\n");
2108                 return ret;
2109         }
2110         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2111                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2112                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2113                         ALUA_MAX_TRANS_DELAY_MSECS);
2114                 return -EINVAL;
2115         }
2116         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2117
2118         return count;
2119 }
2120
2121 ssize_t core_alua_show_implicit_trans_secs(
2122         struct t10_alua_tg_pt_gp *tg_pt_gp,
2123         char *page)
2124 {
2125         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2126 }
2127
2128 ssize_t core_alua_store_implicit_trans_secs(
2129         struct t10_alua_tg_pt_gp *tg_pt_gp,
2130         const char *page,
2131         size_t count)
2132 {
2133         unsigned long tmp;
2134         int ret;
2135
2136         ret = kstrtoul(page, 0, &tmp);
2137         if (ret < 0) {
2138                 pr_err("Unable to extract implicit_trans_secs\n");
2139                 return ret;
2140         }
2141         if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2142                 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2143                         " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2144                         ALUA_MAX_IMPLICIT_TRANS_SECS);
2145                 return  -EINVAL;
2146         }
2147         tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2148
2149         return count;
2150 }
2151
2152 ssize_t core_alua_show_preferred_bit(
2153         struct t10_alua_tg_pt_gp *tg_pt_gp,
2154         char *page)
2155 {
2156         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2157 }
2158
2159 ssize_t core_alua_store_preferred_bit(
2160         struct t10_alua_tg_pt_gp *tg_pt_gp,
2161         const char *page,
2162         size_t count)
2163 {
2164         unsigned long tmp;
2165         int ret;
2166
2167         ret = kstrtoul(page, 0, &tmp);
2168         if (ret < 0) {
2169                 pr_err("Unable to extract preferred ALUA value\n");
2170                 return ret;
2171         }
2172         if ((tmp != 0) && (tmp != 1)) {
2173                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2174                 return -EINVAL;
2175         }
2176         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2177
2178         return count;
2179 }
2180
2181 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2182 {
2183         return sprintf(page, "%d\n",
2184                 atomic_read(&lun->lun_tg_pt_secondary_offline));
2185 }
2186
2187 ssize_t core_alua_store_offline_bit(
2188         struct se_lun *lun,
2189         const char *page,
2190         size_t count)
2191 {
2192         struct se_device *dev = lun->lun_se_dev;
2193         unsigned long tmp;
2194         int ret;
2195
2196         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
2197             (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2198                 return -ENODEV;
2199
2200         ret = kstrtoul(page, 0, &tmp);
2201         if (ret < 0) {
2202                 pr_err("Unable to extract alua_tg_pt_offline value\n");
2203                 return ret;
2204         }
2205         if ((tmp != 0) && (tmp != 1)) {
2206                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2207                                 tmp);
2208                 return -EINVAL;
2209         }
2210
2211         ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2212         if (ret < 0)
2213                 return -EINVAL;
2214
2215         return count;
2216 }
2217
2218 ssize_t core_alua_show_secondary_status(
2219         struct se_lun *lun,
2220         char *page)
2221 {
2222         return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2223 }
2224
2225 ssize_t core_alua_store_secondary_status(
2226         struct se_lun *lun,
2227         const char *page,
2228         size_t count)
2229 {
2230         unsigned long tmp;
2231         int ret;
2232
2233         ret = kstrtoul(page, 0, &tmp);
2234         if (ret < 0) {
2235                 pr_err("Unable to extract alua_tg_pt_status\n");
2236                 return ret;
2237         }
2238         if ((tmp != ALUA_STATUS_NONE) &&
2239             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2240             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2241                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2242                                 tmp);
2243                 return -EINVAL;
2244         }
2245         lun->lun_tg_pt_secondary_stat = (int)tmp;
2246
2247         return count;
2248 }
2249
2250 ssize_t core_alua_show_secondary_write_metadata(
2251         struct se_lun *lun,
2252         char *page)
2253 {
2254         return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2255 }
2256
2257 ssize_t core_alua_store_secondary_write_metadata(
2258         struct se_lun *lun,
2259         const char *page,
2260         size_t count)
2261 {
2262         unsigned long tmp;
2263         int ret;
2264
2265         ret = kstrtoul(page, 0, &tmp);
2266         if (ret < 0) {
2267                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2268                 return ret;
2269         }
2270         if ((tmp != 0) && (tmp != 1)) {
2271                 pr_err("Illegal value for alua_tg_pt_write_md:"
2272                                 " %lu\n", tmp);
2273                 return -EINVAL;
2274         }
2275         lun->lun_tg_pt_secondary_write_md = (int)tmp;
2276
2277         return count;
2278 }
2279
2280 int core_setup_alua(struct se_device *dev)
2281 {
2282         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2283             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2284                 struct t10_alua_lu_gp_member *lu_gp_mem;
2285
2286                 /*
2287                  * Associate this struct se_device with the default ALUA
2288                  * LUN Group.
2289                  */
2290                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2291                 if (IS_ERR(lu_gp_mem))
2292                         return PTR_ERR(lu_gp_mem);
2293
2294                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2295                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2296                                 default_lu_gp);
2297                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2298
2299                 pr_debug("%s: Adding to default ALUA LU Group:"
2300                         " core/alua/lu_gps/default_lu_gp\n",
2301                         dev->transport->name);
2302         }
2303
2304         return 0;
2305 }