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 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_alua.h"
  42 #include "target_core_ua.h"
  43
  44 static sense_reason_t core_alua_check_transition(int state, int valid,
  45                                                  int *primary);
  46 static int core_alua_set_tg_pt_secondary_state(
  47                 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  48                 struct se_port *port, int explicit, int offline);
  49
  50 static char *core_alua_dump_state(int state);
  51
  52 static u16 alua_lu_gps_counter;
  53 static u32 alua_lu_gps_count;
  54
  55 static DEFINE_SPINLOCK(lu_gps_lock);
  56 static LIST_HEAD(lu_gps_list);
  57
  58 struct t10_alua_lu_gp *default_lu_gp;
  59
  60 /*
  61  * REPORT REFERRALS
  62  *
  63  * See sbc3r35 section 5.23
  64  */
  65 sense_reason_t
  66 target_emulate_report_referrals(struct se_cmd *cmd)
  67 {
  68         struct se_device *dev = cmd->se_dev;
  69         struct t10_alua_lba_map *map;
  70         struct t10_alua_lba_map_member *map_mem;
  71         unsigned char *buf;
  72         u32 rd_len = 0, off;
  73
  74         if (cmd->data_length < 4) {
  75                 pr_warn("REPORT REFERRALS allocation length %u too"
  76                         " small\n", cmd->data_length);
  77                 return TCM_INVALID_CDB_FIELD;
  78         }
  79
  80         buf = transport_kmap_data_sg(cmd);
  81         if (!buf)
  82                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  83
  84         off = 4;
  85         spin_lock(&dev->t10_alua.lba_map_lock);
  86         if (list_empty(&dev->t10_alua.lba_map_list)) {
  87                 spin_unlock(&dev->t10_alua.lba_map_lock);
  88                 transport_kunmap_data_sg(cmd);
  89
  90                 return TCM_UNSUPPORTED_SCSI_OPCODE;
  91         }
  92
  93         list_for_each_entry(map, &dev->t10_alua.lba_map_list,
  94                             lba_map_list) {
  95                 int desc_num = off + 3;
  96                 int pg_num;
  97
  98                 off += 4;
  99                 if (cmd->data_length > off)
 100                         put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
 101                 off += 8;
 102                 if (cmd->data_length > off)
 103                         put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
 104                 off += 8;
 105                 rd_len += 20;
 106                 pg_num = 0;
 107                 list_for_each_entry(map_mem, &map->lba_map_mem_list,
 108                                     lba_map_mem_list) {
 109                         int alua_state = map_mem->lba_map_mem_alua_state;
 110                         int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
 111
 112                         if (cmd->data_length > off)
 113                                 buf[off] = alua_state & 0x0f;
 114                         off += 2;
 115                         if (cmd->data_length > off)
 116                                 buf[off] = (alua_pg_id >> 8) & 0xff;
 117                         off++;
 118                         if (cmd->data_length > off)
 119                                 buf[off] = (alua_pg_id & 0xff);
 120                         off++;
 121                         rd_len += 4;
 122                         pg_num++;
 123                 }
 124                 if (cmd->data_length > desc_num)
 125                         buf[desc_num] = pg_num;
 126         }
 127         spin_unlock(&dev->t10_alua.lba_map_lock);
 128
 129         /*
 130          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 131          */
 132         put_unaligned_be16(rd_len, &buf[2]);
 133
 134         transport_kunmap_data_sg(cmd);
 135
 136         target_complete_cmd(cmd, GOOD);
 137         return 0;
 138 }
 139
 140 /*
 141  * REPORT_TARGET_PORT_GROUPS
 142  *
 143  * See spc4r17 section 6.27
 144  */
 145 sense_reason_t
 146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
 147 {
 148         struct se_device *dev = cmd->se_dev;
 149         struct se_port *port;
 150         struct t10_alua_tg_pt_gp *tg_pt_gp;
 151         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 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(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
 227                                 tg_pt_gp_mem_list) {
 228                         port = tg_pt_gp_mem->tg_pt;
 229                         /*
 230                          * Start Target Port descriptor format
 231                          *
 232                          * See spc4r17 section 6.2.7 Table 247
 233                          */
 234                         off += 2; /* Skip over Obsolete */
 235                         /*
 236                          * Set RELATIVE TARGET PORT IDENTIFIER
 237                          */
 238                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 239                         buf[off++] = (port->sep_rtpi & 0xff);
 240                         rd_len += 4;
 241                 }
 242                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 243         }
 244         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 245         /*
 246          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 247          */
 248         put_unaligned_be32(rd_len, &buf[0]);
 249
 250         /*
 251          * Fill in the Extended header parameter data format if requested
 252          */
 253         if (ext_hdr != 0) {
 254                 buf[4] = 0x10;
 255                 /*
 256                  * Set the implicit transition time (in seconds) for the application
 257                  * client to use as a base for it's transition timeout value.
 258                  *
 259                  * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
 260                  * this CDB was received upon to determine this value individually
 261                  * for ALUA target port group.
 262                  */
 263                 port = cmd->se_lun->lun_sep;
 264                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 265                 if (tg_pt_gp_mem) {
 266                         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 267                         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 268                         if (tg_pt_gp)
 269                                 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
 270                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 271                 }
 272         }
 273         transport_kunmap_data_sg(cmd);
 274
 275         target_complete_cmd(cmd, GOOD);
 276         return 0;
 277 }
 278
 279 /*
 280  * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
 281  *
 282  * See spc4r17 section 6.35
 283  */
 284 sense_reason_t
 285 target_emulate_set_target_port_groups(struct se_cmd *cmd)
 286 {
 287         struct se_device *dev = cmd->se_dev;
 288         struct se_port *port, *l_port = cmd->se_lun->lun_sep;
 289         struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
 290         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
 291         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
 292         unsigned char *buf;
 293         unsigned char *ptr;
 294         sense_reason_t rc = TCM_NO_SENSE;
 295         u32 len = 4; /* Skip over RESERVED area in header */
 296         int alua_access_state, primary = 0, valid_states;
 297         u16 tg_pt_id, rtpi;
 298
 299         if (!l_port)
 300                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 301
 302         if (cmd->data_length < 4) {
 303                 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
 304                         " small\n", cmd->data_length);
 305                 return TCM_INVALID_PARAMETER_LIST;
 306         }
 307
 308         buf = transport_kmap_data_sg(cmd);
 309         if (!buf)
 310                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 311
 312         /*
 313          * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
 314          * for the local tg_pt_gp.
 315          */
 316         l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
 317         if (!l_tg_pt_gp_mem) {
 318                 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
 319                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 320                 goto out;
 321         }
 322         spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 323         l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
 324         if (!l_tg_pt_gp) {
 325                 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 326                 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
 327                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 328                 goto out;
 329         }
 330         spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 331
 332         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
 333                 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
 334                                 " while TPGS_EXPLICIT_ALUA is disabled\n");
 335                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 336                 goto out;
 337         }
 338         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
 339
 340         ptr = &buf[4]; /* Skip over RESERVED area in header */
 341
 342         while (len < cmd->data_length) {
 343                 bool found = false;
 344                 alua_access_state = (ptr[0] & 0x0f);
 345                 /*
 346                  * Check the received ALUA access state, and determine if
 347                  * the state is a primary or secondary target port asymmetric
 348                  * access state.
 349                  */
 350                 rc = core_alua_check_transition(alua_access_state,
 351                                                 valid_states, &primary);
 352                 if (rc) {
 353                         /*
 354                          * If the SET TARGET PORT GROUPS attempts to establish
 355                          * an invalid combination of target port asymmetric
 356                          * access states or attempts to establish an
 357                          * unsupported target port asymmetric access state,
 358                          * then the command shall be terminated with CHECK
 359                          * CONDITION status, with the sense key set to ILLEGAL
 360                          * REQUEST, and the additional sense code set to INVALID
 361                          * FIELD IN PARAMETER LIST.
 362                          */
 363                         goto out;
 364                 }
 365
 366                 /*
 367                  * If the ASYMMETRIC ACCESS STATE field (see table 267)
 368                  * specifies a primary target port asymmetric access state,
 369                  * then the TARGET PORT GROUP OR TARGET PORT field specifies
 370                  * a primary target port group for which the primary target
 371                  * port asymmetric access state shall be changed. If the
 372                  * ASYMMETRIC ACCESS STATE field specifies a secondary target
 373                  * port asymmetric access state, then the TARGET PORT GROUP OR
 374                  * TARGET PORT field specifies the relative target port
 375                  * identifier (see 3.1.120) of the target port for which the
 376                  * secondary target port asymmetric access state shall be
 377                  * changed.
 378                  */
 379                 if (primary) {
 380                         tg_pt_id = get_unaligned_be16(ptr + 2);
 381                         /*
 382                          * Locate the matching target port group ID from
 383                          * the global tg_pt_gp list
 384                          */
 385                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 386                         list_for_each_entry(tg_pt_gp,
 387                                         &dev->t10_alua.tg_pt_gps_list,
 388                                         tg_pt_gp_list) {
 389                                 if (!tg_pt_gp->tg_pt_gp_valid_id)
 390                                         continue;
 391
 392                                 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
 393                                         continue;
 394
 395                                 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
 396                                 smp_mb__after_atomic_inc();
 397
 398                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 399
 400                                 if (!core_alua_do_port_transition(tg_pt_gp,
 401                                                 dev, l_port, nacl,
 402                                                 alua_access_state, 1))
 403                                         found = true;
 404
 405                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 406                                 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
 407                                 smp_mb__after_atomic_dec();
 408                                 break;
 409                         }
 410                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 411                 } else {
 412                         /*
 413                          * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
 414                          * the Target Port in question for the the incoming
 415                          * SET_TARGET_PORT_GROUPS op.
 416                          */
 417                         rtpi = get_unaligned_be16(ptr + 2);
 418                         /*
 419                          * Locate the matching relative target port identifier
 420                          * for the struct se_device storage object.
 421                          */
 422                         spin_lock(&dev->se_port_lock);
 423                         list_for_each_entry(port, &dev->dev_sep_list,
 424                                                         sep_list) {
 425                                 if (port->sep_rtpi != rtpi)
 426                                         continue;
 427
 428                                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 429
 430                                 spin_unlock(&dev->se_port_lock);
 431
 432                                 if (!core_alua_set_tg_pt_secondary_state(
 433                                                 tg_pt_gp_mem, port, 1, 1))
 434                                         found = true;
 435
 436                                 spin_lock(&dev->se_port_lock);
 437                                 break;
 438                         }
 439                         spin_unlock(&dev->se_port_lock);
 440                 }
 441
 442                 if (!found) {
 443                         rc = TCM_INVALID_PARAMETER_LIST;
 444                         goto out;
 445                 }
 446
 447                 ptr += 4;
 448                 len += 4;
 449         }
 450
 451 out:
 452         transport_kunmap_data_sg(cmd);
 453         if (!rc)
 454                 target_complete_cmd(cmd, GOOD);
 455         return rc;
 456 }
 457
 458 static inline int core_alua_state_nonoptimized(
 459         struct se_cmd *cmd,
 460         unsigned char *cdb,
 461         int nonop_delay_msecs,
 462         u8 *alua_ascq)
 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         return 0;
 472 }
 473
 474 static inline int core_alua_state_lba_dependent(
 475         struct se_cmd *cmd,
 476         struct t10_alua_tg_pt_gp *tg_pt_gp,
 477         u8 *alua_ascq)
 478 {
 479         struct se_device *dev = cmd->se_dev;
 480         u64 segment_size, segment_mult, sectors, lba;
 481
 482         /* Only need to check for cdb actually containing LBAs */
 483         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
 484                 return 0;
 485
 486         spin_lock(&dev->t10_alua.lba_map_lock);
 487         segment_size = dev->t10_alua.lba_map_segment_size;
 488         segment_mult = dev->t10_alua.lba_map_segment_multiplier;
 489         sectors = cmd->data_length / dev->dev_attrib.block_size;
 490
 491         lba = cmd->t_task_lba;
 492         while (lba < cmd->t_task_lba + sectors) {
 493                 struct t10_alua_lba_map *cur_map = NULL, *map;
 494                 struct t10_alua_lba_map_member *map_mem;
 495
 496                 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
 497                                     lba_map_list) {
 498                         u64 start_lba, last_lba;
 499                         u64 first_lba = map->lba_map_first_lba;
 500
 501                         if (segment_mult) {
 502                                 u64 tmp = lba;
 503                                 start_lba = do_div(tmp, segment_size * segment_mult);
 504
 505                                 last_lba = first_lba + segment_size - 1;
 506                                 if (start_lba >= first_lba &&
 507                                     start_lba <= last_lba) {
 508                                         lba += segment_size;
 509                                         cur_map = map;
 510                                         break;
 511                                 }
 512                         } else {
 513                                 last_lba = map->lba_map_last_lba;
 514                                 if (lba >= first_lba && lba <= last_lba) {
 515                                         lba = last_lba + 1;
 516                                         cur_map = map;
 517                                         break;
 518                                 }
 519                         }
 520                 }
 521                 if (!cur_map) {
 522                         spin_unlock(&dev->t10_alua.lba_map_lock);
 523                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 524                         return 1;
 525                 }
 526                 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
 527                                     lba_map_mem_list) {
 528                         if (map_mem->lba_map_mem_alua_pg_id !=
 529                             tg_pt_gp->tg_pt_gp_id)
 530                                 continue;
 531                         switch(map_mem->lba_map_mem_alua_state) {
 532                         case ALUA_ACCESS_STATE_STANDBY:
 533                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 534                                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 535                                 return 1;
 536                         case ALUA_ACCESS_STATE_UNAVAILABLE:
 537                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 538                                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 539                                 return 1;
 540                         default:
 541                                 break;
 542                         }
 543                 }
 544         }
 545         spin_unlock(&dev->t10_alua.lba_map_lock);
 546         return 0;
 547 }
 548
 549 static inline int core_alua_state_standby(
 550         struct se_cmd *cmd,
 551         unsigned char *cdb,
 552         u8 *alua_ascq)
 553 {
 554         /*
 555          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 556          * spc4r17 section 5.9.2.4.4
 557          */
 558         switch (cdb[0]) {
 559         case INQUIRY:
 560         case LOG_SELECT:
 561         case LOG_SENSE:
 562         case MODE_SELECT:
 563         case MODE_SENSE:
 564         case REPORT_LUNS:
 565         case RECEIVE_DIAGNOSTIC:
 566         case SEND_DIAGNOSTIC:
 567                 return 0;
 568         case MAINTENANCE_IN:
 569                 switch (cdb[1] & 0x1f) {
 570                 case MI_REPORT_TARGET_PGS:
 571                         return 0;
 572                 default:
 573                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 574                         return 1;
 575                 }
 576         case MAINTENANCE_OUT:
 577                 switch (cdb[1]) {
 578                 case MO_SET_TARGET_PGS:
 579                         return 0;
 580                 default:
 581                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 582                         return 1;
 583                 }
 584         case REQUEST_SENSE:
 585         case PERSISTENT_RESERVE_IN:
 586         case PERSISTENT_RESERVE_OUT:
 587         case READ_BUFFER:
 588         case WRITE_BUFFER:
 589                 return 0;
 590         default:
 591                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 592                 return 1;
 593         }
 594
 595         return 0;
 596 }
 597
 598 static inline int core_alua_state_unavailable(
 599         struct se_cmd *cmd,
 600         unsigned char *cdb,
 601         u8 *alua_ascq)
 602 {
 603         /*
 604          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 605          * spc4r17 section 5.9.2.4.5
 606          */
 607         switch (cdb[0]) {
 608         case INQUIRY:
 609         case REPORT_LUNS:
 610                 return 0;
 611         case MAINTENANCE_IN:
 612                 switch (cdb[1] & 0x1f) {
 613                 case MI_REPORT_TARGET_PGS:
 614                         return 0;
 615                 default:
 616                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 617                         return 1;
 618                 }
 619         case MAINTENANCE_OUT:
 620                 switch (cdb[1]) {
 621                 case MO_SET_TARGET_PGS:
 622                         return 0;
 623                 default:
 624                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 625                         return 1;
 626                 }
 627         case REQUEST_SENSE:
 628         case READ_BUFFER:
 629         case WRITE_BUFFER:
 630                 return 0;
 631         default:
 632                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 633                 return 1;
 634         }
 635
 636         return 0;
 637 }
 638
 639 static inline int core_alua_state_transition(
 640         struct se_cmd *cmd,
 641         unsigned char *cdb,
 642         u8 *alua_ascq)
 643 {
 644         /*
 645          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
 646          * spc4r17 section 5.9.2.5
 647          */
 648         switch (cdb[0]) {
 649         case INQUIRY:
 650         case REPORT_LUNS:
 651                 return 0;
 652         case MAINTENANCE_IN:
 653                 switch (cdb[1] & 0x1f) {
 654                 case MI_REPORT_TARGET_PGS:
 655                         return 0;
 656                 default:
 657                         *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 658                         return 1;
 659                 }
 660         case REQUEST_SENSE:
 661         case READ_BUFFER:
 662         case WRITE_BUFFER:
 663                 return 0;
 664         default:
 665                 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 666                 return 1;
 667         }
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * return 1: Is used to signal LUN not accessible, and check condition/not ready
 674  * return 0: Used to signal success
 675  * return -1: Used to signal failure, and invalid cdb field
 676  */
 677 sense_reason_t
 678 target_alua_state_check(struct se_cmd *cmd)
 679 {
 680         struct se_device *dev = cmd->se_dev;
 681         unsigned char *cdb = cmd->t_task_cdb;
 682         struct se_lun *lun = cmd->se_lun;
 683         struct se_port *port = lun->lun_sep;
 684         struct t10_alua_tg_pt_gp *tg_pt_gp;
 685         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 686         int out_alua_state, nonop_delay_msecs;
 687         u8 alua_ascq;
 688         int ret;
 689
 690         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 691                 return 0;
 692         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
 693                 return 0;
 694
 695         if (!port)
 696                 return 0;
 697         /*
 698          * First, check for a struct se_port specific secondary ALUA target port
 699          * access state: OFFLINE
 700          */
 701         if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
 702                 pr_debug("ALUA: Got secondary offline status for local"
 703                                 " target port\n");
 704                 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
 705                 ret = 1;
 706                 goto out;
 707         }
 708          /*
 709          * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
 710          * ALUA target port group, to obtain current ALUA access state.
 711          * Otherwise look for the underlying struct se_device association with
 712          * a ALUA logical unit group.
 713          */
 714         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 715         if (!tg_pt_gp_mem)
 716                 return 0;
 717
 718         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 719         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 720         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 721         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 722         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 723         /*
 724          * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
 725          * statement so the compiler knows explicitly to check this case first.
 726          * For the Optimized ALUA access state case, we want to process the
 727          * incoming fabric cmd ASAP..
 728          */
 729         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
 730                 return 0;
 731
 732         switch (out_alua_state) {
 733         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 734                 ret = core_alua_state_nonoptimized(cmd, cdb,
 735                                         nonop_delay_msecs, &alua_ascq);
 736                 break;
 737         case ALUA_ACCESS_STATE_STANDBY:
 738                 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
 739                 break;
 740         case ALUA_ACCESS_STATE_UNAVAILABLE:
 741                 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
 742                 break;
 743         case ALUA_ACCESS_STATE_TRANSITION:
 744                 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
 745                 break;
 746         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 747                 ret = core_alua_state_lba_dependent(cmd, tg_pt_gp, &alua_ascq);
 748                 break;
 749         /*
 750          * OFFLINE is a secondary ALUA target port group access state, that is
 751          * handled above with struct se_port->sep_tg_pt_secondary_offline=1
 752          */
 753         case ALUA_ACCESS_STATE_OFFLINE:
 754         default:
 755                 pr_err("Unknown ALUA access state: 0x%02x\n",
 756                                 out_alua_state);
 757                 return TCM_INVALID_CDB_FIELD;
 758         }
 759
 760 out:
 761         if (ret > 0) {
 762                 /*
 763                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 764                  * The ALUA additional sense code qualifier (ASCQ) is determined
 765                  * by the ALUA primary or secondary access state..
 766                  */
 767                 pr_debug("[%s]: ALUA TG Port not available, "
 768                         "SenseKey: NOT_READY, ASC/ASCQ: "
 769                         "0x04/0x%02x\n",
 770                         cmd->se_tfo->get_fabric_name(), alua_ascq);
 771
 772                 cmd->scsi_asc = 0x04;
 773                 cmd->scsi_ascq = alua_ascq;
 774                 return TCM_CHECK_CONDITION_NOT_READY;
 775         }
 776
 777         return 0;
 778 }
 779
 780 /*
 781  * Check implicit and explicit ALUA state change request.
 782  */
 783 static sense_reason_t
 784 core_alua_check_transition(int state, int valid, int *primary)
 785 {
 786         /*
 787          * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 788          * defined as primary target port asymmetric access states.
 789          */
 790         switch (state) {
 791         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 792                 if (!(valid & ALUA_AO_SUP))
 793                         goto not_supported;
 794                 *primary = 1;
 795                 break;
 796         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 797                 if (!(valid & ALUA_AN_SUP))
 798                         goto not_supported;
 799                 *primary = 1;
 800                 break;
 801         case ALUA_ACCESS_STATE_STANDBY:
 802                 if (!(valid & ALUA_S_SUP))
 803                         goto not_supported;
 804                 *primary = 1;
 805                 break;
 806         case ALUA_ACCESS_STATE_UNAVAILABLE:
 807                 if (!(valid & ALUA_U_SUP))
 808                         goto not_supported;
 809                 *primary = 1;
 810                 break;
 811         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 812                 if (!(valid & ALUA_LBD_SUP))
 813                         goto not_supported;
 814                 *primary = 1;
 815                 break;
 816         case ALUA_ACCESS_STATE_OFFLINE:
 817                 /*
 818                  * OFFLINE state is defined as a secondary target port
 819                  * asymmetric access state.
 820                  */
 821                 if (!(valid & ALUA_O_SUP))
 822                         goto not_supported;
 823                 *primary = 0;
 824                 break;
 825         case ALUA_ACCESS_STATE_TRANSITION:
 826                 /*
 827                  * Transitioning is set internally, and
 828                  * cannot be selected manually.
 829                  */
 830                 goto not_supported;
 831         default:
 832                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 833                 return TCM_INVALID_PARAMETER_LIST;
 834         }
 835
 836         return 0;
 837
 838 not_supported:
 839         pr_err("ALUA access state %s not supported",
 840                core_alua_dump_state(state));
 841         return TCM_INVALID_PARAMETER_LIST;
 842 }
 843
 844 static char *core_alua_dump_state(int state)
 845 {
 846         switch (state) {
 847         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 848                 return "Active/Optimized";
 849         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 850                 return "Active/NonOptimized";
 851         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 852                 return "LBA Dependent";
 853         case ALUA_ACCESS_STATE_STANDBY:
 854                 return "Standby";
 855         case ALUA_ACCESS_STATE_UNAVAILABLE:
 856                 return "Unavailable";
 857         case ALUA_ACCESS_STATE_OFFLINE:
 858                 return "Offline";
 859         case ALUA_ACCESS_STATE_TRANSITION:
 860                 return "Transitioning";
 861         default:
 862                 return "Unknown";
 863         }
 864
 865         return NULL;
 866 }
 867
 868 char *core_alua_dump_status(int status)
 869 {
 870         switch (status) {
 871         case ALUA_STATUS_NONE:
 872                 return "None";
 873         case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
 874                 return "Altered by Explicit STPG";
 875         case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
 876                 return "Altered by Implicit ALUA";
 877         default:
 878                 return "Unknown";
 879         }
 880
 881         return NULL;
 882 }
 883
 884 /*
 885  * Used by fabric modules to determine when we need to delay processing
 886  * for the Active/NonOptimized paths..
 887  */
 888 int core_alua_check_nonop_delay(
 889         struct se_cmd *cmd)
 890 {
 891         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 892                 return 0;
 893         if (in_interrupt())
 894                 return 0;
 895         /*
 896          * The ALUA Active/NonOptimized access state delay can be disabled
 897          * in via configfs with a value of zero
 898          */
 899         if (!cmd->alua_nonop_delay)
 900                 return 0;
 901         /*
 902          * struct se_cmd->alua_nonop_delay gets set by a target port group
 903          * defined interval in core_alua_state_nonoptimized()
 904          */
 905         msleep_interruptible(cmd->alua_nonop_delay);
 906         return 0;
 907 }
 908 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 909
 910 /*
 911  * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
 912  *
 913  */
 914 static int core_alua_write_tpg_metadata(
 915         const char *path,
 916         unsigned char *md_buf,
 917         u32 md_buf_len)
 918 {
 919         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 920         int ret;
 921
 922         if (IS_ERR(file)) {
 923                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 924                 return -ENODEV;
 925         }
 926         ret = kernel_write(file, md_buf, md_buf_len, 0);
 927         if (ret < 0)
 928                 pr_err("Error writing ALUA metadata file: %s\n", path);
 929         fput(file);
 930         return (ret < 0) ? -EIO : 0;
 931 }
 932
 933 /*
 934  * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 935  */
 936 static int core_alua_update_tpg_primary_metadata(
 937         struct t10_alua_tg_pt_gp *tg_pt_gp)
 938 {
 939         unsigned char *md_buf;
 940         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 941         char path[ALUA_METADATA_PATH_LEN];
 942         int len, rc;
 943
 944         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
 945         if (!md_buf) {
 946                 pr_err("Unable to allocate buf for ALUA metadata\n");
 947                 return -ENOMEM;
 948         }
 949
 950         memset(path, 0, ALUA_METADATA_PATH_LEN);
 951
 952         len = snprintf(md_buf, ALUA_MD_BUF_LEN,
 953                         "tg_pt_gp_id=%hu\n"
 954                         "alua_access_state=0x%02x\n"
 955                         "alua_access_status=0x%02x\n",
 956                         tg_pt_gp->tg_pt_gp_id,
 957                         tg_pt_gp->tg_pt_gp_alua_pending_state,
 958                         tg_pt_gp->tg_pt_gp_alua_access_status);
 959
 960         snprintf(path, ALUA_METADATA_PATH_LEN,
 961                 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
 962                 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 963
 964         rc = core_alua_write_tpg_metadata(path, md_buf, len);
 965         kfree(md_buf);
 966         return rc;
 967 }
 968
 969 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
 970 {
 971         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
 972                 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
 973         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
 974         struct se_dev_entry *se_deve;
 975         struct se_lun_acl *lacl;
 976         struct se_port *port;
 977         struct t10_alua_tg_pt_gp_member *mem;
 978         bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
 979                          ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
 980
 981         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 982         list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
 983                                 tg_pt_gp_mem_list) {
 984                 port = mem->tg_pt;
 985                 /*
 986                  * After an implicit target port asymmetric access state
 987                  * change, a device server shall establish a unit attention
 988                  * condition for the initiator port associated with every I_T
 989                  * nexus with the additional sense code set to ASYMMETRIC
 990                  * ACCESS STATE CHANGED.
 991                  *
 992                  * After an explicit target port asymmetric access state
 993                  * change, a device server shall establish a unit attention
 994                  * condition with the additional sense code set to ASYMMETRIC
 995                  * ACCESS STATE CHANGED for the initiator port associated with
 996                  * every I_T nexus other than the I_T nexus on which the SET
 997                  * TARGET PORT GROUPS command
 998                  */
 999                 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
1000                 smp_mb__after_atomic_inc();
1001                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1002
1003                 spin_lock_bh(&port->sep_alua_lock);
1004                 list_for_each_entry(se_deve, &port->sep_alua_list,
1005                                         alua_port_list) {
1006                         lacl = se_deve->se_lun_acl;
1007                         /*
1008                          * se_deve->se_lun_acl pointer may be NULL for a
1009                          * entry created without explicit Node+MappedLUN ACLs
1010                          */
1011                         if (!lacl)
1012                                 continue;
1013
1014                         if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1015                              ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1016                            (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1017                             (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1018                            (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1019                             (tg_pt_gp->tg_pt_gp_alua_port == port))
1020                                 continue;
1021
1022                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
1023                                 se_deve->mapped_lun, 0x2A,
1024                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1025                 }
1026                 spin_unlock_bh(&port->sep_alua_lock);
1027
1028                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1029                 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
1030                 smp_mb__after_atomic_dec();
1031         }
1032         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1033         /*
1034          * Update the ALUA metadata buf that has been allocated in
1035          * core_alua_do_port_transition(), this metadata will be written
1036          * to struct file.
1037          *
1038          * Note that there is the case where we do not want to update the
1039          * metadata when the saved metadata is being parsed in userspace
1040          * when setting the existing port access state and access status.
1041          *
1042          * Also note that the failure to write out the ALUA metadata to
1043          * struct file does NOT affect the actual ALUA transition.
1044          */
1045         if (tg_pt_gp->tg_pt_gp_write_metadata) {
1046                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1047                 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1048                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1049         }
1050         /*
1051          * Set the current primary ALUA access state to the requested new state
1052          */
1053         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1054                    tg_pt_gp->tg_pt_gp_alua_pending_state);
1055
1056         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1057                 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1058                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1059                 tg_pt_gp->tg_pt_gp_id,
1060                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1061                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1062         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1063         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1064         smp_mb__after_atomic_dec();
1065         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1066
1067         if (tg_pt_gp->tg_pt_gp_transition_complete)
1068                 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1069 }
1070
1071 static int core_alua_do_transition_tg_pt(
1072         struct t10_alua_tg_pt_gp *tg_pt_gp,
1073         int new_state,
1074         int explicit)
1075 {
1076         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1077         DECLARE_COMPLETION_ONSTACK(wait);
1078
1079         /* Nothing to be done here */
1080         if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1081                 return 0;
1082
1083         if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1084                 return -EAGAIN;
1085
1086         /*
1087          * Flush any pending transitions
1088          */
1089         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1090             atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1091             ALUA_ACCESS_STATE_TRANSITION) {
1092                 /* Just in case */
1093                 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1094                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1095                 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1096                 wait_for_completion(&wait);
1097                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1098                 return 0;
1099         }
1100
1101         /*
1102          * Save the old primary ALUA access state, and set the current state
1103          * to ALUA_ACCESS_STATE_TRANSITION.
1104          */
1105         tg_pt_gp->tg_pt_gp_alua_previous_state =
1106                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1107         tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1108
1109         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1110                         ALUA_ACCESS_STATE_TRANSITION);
1111         tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1112                                 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1113                                 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1114
1115         /*
1116          * Check for the optional ALUA primary state transition delay
1117          */
1118         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1119                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1120
1121         /*
1122          * Take a reference for workqueue item
1123          */
1124         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1125         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1126         smp_mb__after_atomic_inc();
1127         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1128
1129         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1130                 unsigned long transition_tmo;
1131
1132                 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1133                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1134                                    &tg_pt_gp->tg_pt_gp_transition_work,
1135                                    transition_tmo);
1136         } else {
1137                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1138                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1139                                    &tg_pt_gp->tg_pt_gp_transition_work, 0);
1140                 wait_for_completion(&wait);
1141                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1142         }
1143
1144         return 0;
1145 }
1146
1147 int core_alua_do_port_transition(
1148         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1149         struct se_device *l_dev,
1150         struct se_port *l_port,
1151         struct se_node_acl *l_nacl,
1152         int new_state,
1153         int explicit)
1154 {
1155         struct se_device *dev;
1156         struct t10_alua_lu_gp *lu_gp;
1157         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1158         struct t10_alua_tg_pt_gp *tg_pt_gp;
1159         int primary, valid_states, rc = 0;
1160
1161         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1162         if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1163                 return -EINVAL;
1164
1165         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1166         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1167         lu_gp = local_lu_gp_mem->lu_gp;
1168         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1169         smp_mb__after_atomic_inc();
1170         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1171         /*
1172          * For storage objects that are members of the 'default_lu_gp',
1173          * we only do transition on the passed *l_tp_pt_gp, and not
1174          * on all of the matching target port groups IDs in default_lu_gp.
1175          */
1176         if (!lu_gp->lu_gp_id) {
1177                 /*
1178                  * core_alua_do_transition_tg_pt() will always return
1179                  * success.
1180                  */
1181                 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1182                 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1183                 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1184                                                    new_state, explicit);
1185                 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1186                 smp_mb__after_atomic_dec();
1187                 return rc;
1188         }
1189         /*
1190          * For all other LU groups aside from 'default_lu_gp', walk all of
1191          * the associated storage objects looking for a matching target port
1192          * group ID from the local target port group.
1193          */
1194         spin_lock(&lu_gp->lu_gp_lock);
1195         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1196                                 lu_gp_mem_list) {
1197
1198                 dev = lu_gp_mem->lu_gp_mem_dev;
1199                 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
1200                 smp_mb__after_atomic_inc();
1201                 spin_unlock(&lu_gp->lu_gp_lock);
1202
1203                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1204                 list_for_each_entry(tg_pt_gp,
1205                                 &dev->t10_alua.tg_pt_gps_list,
1206                                 tg_pt_gp_list) {
1207
1208                         if (!tg_pt_gp->tg_pt_gp_valid_id)
1209                                 continue;
1210                         /*
1211                          * If the target behavior port asymmetric access state
1212                          * is changed for any target port group accessible via
1213                          * a logical unit within a LU group, the target port
1214                          * behavior group asymmetric access states for the same
1215                          * target port group accessible via other logical units
1216                          * in that LU group will also change.
1217                          */
1218                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1219                                 continue;
1220
1221                         if (l_tg_pt_gp == tg_pt_gp) {
1222                                 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1223                                 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1224                         } else {
1225                                 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1226                                 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1227                         }
1228                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1229                         smp_mb__after_atomic_inc();
1230                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1231                         /*
1232                          * core_alua_do_transition_tg_pt() will always return
1233                          * success.
1234                          */
1235                         rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1236                                         new_state, explicit);
1237
1238                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1239                         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1240                         smp_mb__after_atomic_dec();
1241                         if (rc)
1242                                 break;
1243                 }
1244                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1245
1246                 spin_lock(&lu_gp->lu_gp_lock);
1247                 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
1248                 smp_mb__after_atomic_dec();
1249         }
1250         spin_unlock(&lu_gp->lu_gp_lock);
1251
1252         if (!rc) {
1253                 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1254                          " Group IDs: %hu %s transition to primary state: %s\n",
1255                          config_item_name(&lu_gp->lu_gp_group.cg_item),
1256                          l_tg_pt_gp->tg_pt_gp_id,
1257                          (explicit) ? "explicit" : "implicit",
1258                          core_alua_dump_state(new_state));
1259         }
1260
1261         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1262         smp_mb__after_atomic_dec();
1263         return rc;
1264 }
1265
1266 /*
1267  * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1268  */
1269 static int core_alua_update_tpg_secondary_metadata(
1270         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1271         struct se_port *port)
1272 {
1273         unsigned char *md_buf;
1274         struct se_portal_group *se_tpg = port->sep_tpg;
1275         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1276         int len, rc;
1277
1278         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1279         if (!md_buf) {
1280                 pr_err("Unable to allocate buf for ALUA metadata\n");
1281                 return -ENOMEM;
1282         }
1283
1284         memset(path, 0, ALUA_METADATA_PATH_LEN);
1285         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1286
1287         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1288                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1289
1290         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1291                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1292                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1293
1294         len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1295                         "alua_tg_pt_status=0x%02x\n",
1296                         atomic_read(&port->sep_tg_pt_secondary_offline),
1297                         port->sep_tg_pt_secondary_stat);
1298
1299         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1300                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1301                         port->sep_lun->unpacked_lun);
1302
1303         rc = core_alua_write_tpg_metadata(path, md_buf, len);
1304         kfree(md_buf);
1305
1306         return rc;
1307 }
1308
1309 static int core_alua_set_tg_pt_secondary_state(
1310         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1311         struct se_port *port,
1312         int explicit,
1313         int offline)
1314 {
1315         struct t10_alua_tg_pt_gp *tg_pt_gp;
1316         int trans_delay_msecs;
1317
1318         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1319         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1320         if (!tg_pt_gp) {
1321                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1322                 pr_err("Unable to complete secondary state"
1323                                 " transition\n");
1324                 return -EINVAL;
1325         }
1326         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1327         /*
1328          * Set the secondary ALUA target port access state to OFFLINE
1329          * or release the previously secondary state for struct se_port
1330          */
1331         if (offline)
1332                 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1333         else
1334                 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1335
1336         port->sep_tg_pt_secondary_stat = (explicit) ?
1337                         ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1338                         ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1339
1340         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1341                 " to secondary access state: %s\n", (explicit) ? "explicit" :
1342                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1343                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1344
1345         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1346         /*
1347          * Do the optional transition delay after we set the secondary
1348          * ALUA access state.
1349          */
1350         if (trans_delay_msecs != 0)
1351                 msleep_interruptible(trans_delay_msecs);
1352         /*
1353          * See if we need to update the ALUA fabric port metadata for
1354          * secondary state and status
1355          */
1356         if (port->sep_tg_pt_secondary_write_md) {
1357                 mutex_lock(&port->sep_tg_pt_md_mutex);
1358                 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1359                 mutex_unlock(&port->sep_tg_pt_md_mutex);
1360         }
1361
1362         return 0;
1363 }
1364
1365 struct t10_alua_lba_map *
1366 core_alua_allocate_lba_map(struct list_head *list,
1367                            u64 first_lba, u64 last_lba)
1368 {
1369         struct t10_alua_lba_map *lba_map;
1370
1371         lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1372         if (!lba_map) {
1373                 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1374                 return ERR_PTR(-ENOMEM);
1375         }
1376         INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1377         lba_map->lba_map_first_lba = first_lba;
1378         lba_map->lba_map_last_lba = last_lba;
1379
1380         list_add_tail(&lba_map->lba_map_list, list);
1381         return lba_map;
1382 }
1383
1384 int
1385 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1386                                int pg_id, int state)
1387 {
1388         struct t10_alua_lba_map_member *lba_map_mem;
1389
1390         list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1391                             lba_map_mem_list) {
1392                 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1393                         pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1394                         return -EINVAL;
1395                 }
1396         }
1397
1398         lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1399         if (!lba_map_mem) {
1400                 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1401                 return -ENOMEM;
1402         }
1403         lba_map_mem->lba_map_mem_alua_state = state;
1404         lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1405
1406         list_add_tail(&lba_map_mem->lba_map_mem_list,
1407                       &lba_map->lba_map_mem_list);
1408         return 0;
1409 }
1410
1411 void
1412 core_alua_free_lba_map(struct list_head *lba_list)
1413 {
1414         struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1415         struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1416
1417         list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1418                                  lba_map_list) {
1419                 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1420                                          &lba_map->lba_map_mem_list,
1421                                          lba_map_mem_list) {
1422                         list_del(&lba_map_mem->lba_map_mem_list);
1423                         kmem_cache_free(t10_alua_lba_map_mem_cache,
1424                                         lba_map_mem);
1425                 }
1426                 list_del(&lba_map->lba_map_list);
1427                 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1428         }
1429 }
1430
1431 void
1432 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1433                       int segment_size, int segment_mult)
1434 {
1435         struct list_head old_lba_map_list;
1436         struct t10_alua_tg_pt_gp *tg_pt_gp;
1437         int activate = 0, supported;
1438
1439         INIT_LIST_HEAD(&old_lba_map_list);
1440         spin_lock(&dev->t10_alua.lba_map_lock);
1441         dev->t10_alua.lba_map_segment_size = segment_size;
1442         dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1443         list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1444         if (lba_map_list) {
1445                 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1446                 activate = 1;
1447         }
1448         spin_unlock(&dev->t10_alua.lba_map_lock);
1449         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1450         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1451                             tg_pt_gp_list) {
1452
1453                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1454                         continue;
1455                 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1456                 if (activate)
1457                         supported |= ALUA_LBD_SUP;
1458                 else
1459                         supported &= ~ALUA_LBD_SUP;
1460                 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1461         }
1462         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1463         core_alua_free_lba_map(&old_lba_map_list);
1464 }
1465
1466 struct t10_alua_lu_gp *
1467 core_alua_allocate_lu_gp(const char *name, int def_group)
1468 {
1469         struct t10_alua_lu_gp *lu_gp;
1470
1471         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1472         if (!lu_gp) {
1473                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1474                 return ERR_PTR(-ENOMEM);
1475         }
1476         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1477         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1478         spin_lock_init(&lu_gp->lu_gp_lock);
1479         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1480
1481         if (def_group) {
1482                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1483                 lu_gp->lu_gp_valid_id = 1;
1484                 alua_lu_gps_count++;
1485         }
1486
1487         return lu_gp;
1488 }
1489
1490 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1491 {
1492         struct t10_alua_lu_gp *lu_gp_tmp;
1493         u16 lu_gp_id_tmp;
1494         /*
1495          * The lu_gp->lu_gp_id may only be set once..
1496          */
1497         if (lu_gp->lu_gp_valid_id) {
1498                 pr_warn("ALUA LU Group already has a valid ID,"
1499                         " ignoring request\n");
1500                 return -EINVAL;
1501         }
1502
1503         spin_lock(&lu_gps_lock);
1504         if (alua_lu_gps_count == 0x0000ffff) {
1505                 pr_err("Maximum ALUA alua_lu_gps_count:"
1506                                 " 0x0000ffff reached\n");
1507                 spin_unlock(&lu_gps_lock);
1508                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1509                 return -ENOSPC;
1510         }
1511 again:
1512         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1513                                 alua_lu_gps_counter++;
1514
1515         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1516                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1517                         if (!lu_gp_id)
1518                                 goto again;
1519
1520                         pr_warn("ALUA Logical Unit Group ID: %hu"
1521                                 " already exists, ignoring request\n",
1522                                 lu_gp_id);
1523                         spin_unlock(&lu_gps_lock);
1524                         return -EINVAL;
1525                 }
1526         }
1527
1528         lu_gp->lu_gp_id = lu_gp_id_tmp;
1529         lu_gp->lu_gp_valid_id = 1;
1530         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1531         alua_lu_gps_count++;
1532         spin_unlock(&lu_gps_lock);
1533
1534         return 0;
1535 }
1536
1537 static struct t10_alua_lu_gp_member *
1538 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1539 {
1540         struct t10_alua_lu_gp_member *lu_gp_mem;
1541
1542         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1543         if (!lu_gp_mem) {
1544                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1545                 return ERR_PTR(-ENOMEM);
1546         }
1547         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1548         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1549         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1550
1551         lu_gp_mem->lu_gp_mem_dev = dev;
1552         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1553
1554         return lu_gp_mem;
1555 }
1556
1557 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1558 {
1559         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1560         /*
1561          * Once we have reached this point, config_item_put() has
1562          * already been called from target_core_alua_drop_lu_gp().
1563          *
1564          * Here, we remove the *lu_gp from the global list so that
1565          * no associations can be made while we are releasing
1566          * struct t10_alua_lu_gp.
1567          */
1568         spin_lock(&lu_gps_lock);
1569         list_del(&lu_gp->lu_gp_node);
1570         alua_lu_gps_count--;
1571         spin_unlock(&lu_gps_lock);
1572         /*
1573          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1574          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1575          * released with core_alua_put_lu_gp_from_name()
1576          */
1577         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1578                 cpu_relax();
1579         /*
1580          * Release reference to struct t10_alua_lu_gp * from all associated
1581          * struct se_device.
1582          */
1583         spin_lock(&lu_gp->lu_gp_lock);
1584         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1585                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1586                 if (lu_gp_mem->lu_gp_assoc) {
1587                         list_del(&lu_gp_mem->lu_gp_mem_list);
1588                         lu_gp->lu_gp_members--;
1589                         lu_gp_mem->lu_gp_assoc = 0;
1590                 }
1591                 spin_unlock(&lu_gp->lu_gp_lock);
1592                 /*
1593                  *
1594                  * lu_gp_mem is associated with a single
1595                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1596                  * struct se_device is released via core_alua_free_lu_gp_mem().
1597                  *
1598                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1599                  * we want to re-associate a given lu_gp_mem with default_lu_gp.
1600                  */
1601                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1602                 if (lu_gp != default_lu_gp)
1603                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1604                                         default_lu_gp);
1605                 else
1606                         lu_gp_mem->lu_gp = NULL;
1607                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1608
1609                 spin_lock(&lu_gp->lu_gp_lock);
1610         }
1611         spin_unlock(&lu_gp->lu_gp_lock);
1612
1613         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1614 }
1615
1616 void core_alua_free_lu_gp_mem(struct se_device *dev)
1617 {
1618         struct t10_alua_lu_gp *lu_gp;
1619         struct t10_alua_lu_gp_member *lu_gp_mem;
1620
1621         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1622         if (!lu_gp_mem)
1623                 return;
1624
1625         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1626                 cpu_relax();
1627
1628         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1629         lu_gp = lu_gp_mem->lu_gp;
1630         if (lu_gp) {
1631                 spin_lock(&lu_gp->lu_gp_lock);
1632                 if (lu_gp_mem->lu_gp_assoc) {
1633                         list_del(&lu_gp_mem->lu_gp_mem_list);
1634                         lu_gp->lu_gp_members--;
1635                         lu_gp_mem->lu_gp_assoc = 0;
1636                 }
1637                 spin_unlock(&lu_gp->lu_gp_lock);
1638                 lu_gp_mem->lu_gp = NULL;
1639         }
1640         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1641
1642         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1643 }
1644
1645 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1646 {
1647         struct t10_alua_lu_gp *lu_gp;
1648         struct config_item *ci;
1649
1650         spin_lock(&lu_gps_lock);
1651         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1652                 if (!lu_gp->lu_gp_valid_id)
1653                         continue;
1654                 ci = &lu_gp->lu_gp_group.cg_item;
1655                 if (!strcmp(config_item_name(ci), name)) {
1656                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1657                         spin_unlock(&lu_gps_lock);
1658                         return lu_gp;
1659                 }
1660         }
1661         spin_unlock(&lu_gps_lock);
1662
1663         return NULL;
1664 }
1665
1666 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1667 {
1668         spin_lock(&lu_gps_lock);
1669         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1670         spin_unlock(&lu_gps_lock);
1671 }
1672
1673 /*
1674  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1675  */
1676 void __core_alua_attach_lu_gp_mem(
1677         struct t10_alua_lu_gp_member *lu_gp_mem,
1678         struct t10_alua_lu_gp *lu_gp)
1679 {
1680         spin_lock(&lu_gp->lu_gp_lock);
1681         lu_gp_mem->lu_gp = lu_gp;
1682         lu_gp_mem->lu_gp_assoc = 1;
1683         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1684         lu_gp->lu_gp_members++;
1685         spin_unlock(&lu_gp->lu_gp_lock);
1686 }
1687
1688 /*
1689  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1690  */
1691 void __core_alua_drop_lu_gp_mem(
1692         struct t10_alua_lu_gp_member *lu_gp_mem,
1693         struct t10_alua_lu_gp *lu_gp)
1694 {
1695         spin_lock(&lu_gp->lu_gp_lock);
1696         list_del(&lu_gp_mem->lu_gp_mem_list);
1697         lu_gp_mem->lu_gp = NULL;
1698         lu_gp_mem->lu_gp_assoc = 0;
1699         lu_gp->lu_gp_members--;
1700         spin_unlock(&lu_gp->lu_gp_lock);
1701 }
1702
1703 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1704                 const char *name, int def_group)
1705 {
1706         struct t10_alua_tg_pt_gp *tg_pt_gp;
1707
1708         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1709         if (!tg_pt_gp) {
1710                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1711                 return NULL;
1712         }
1713         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1714         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1715         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1716         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1717         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1718         INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1719                           core_alua_do_transition_tg_pt_work);
1720         tg_pt_gp->tg_pt_gp_dev = dev;
1721         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1722                 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1723         /*
1724          * Enable both explicit and implicit ALUA support by default
1725          */
1726         tg_pt_gp->tg_pt_gp_alua_access_type =
1727                         TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1728         /*
1729          * Set the default Active/NonOptimized Delay in milliseconds
1730          */
1731         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1732         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1733         tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1734
1735         /*
1736          * Enable all supported states
1737          */
1738         tg_pt_gp->tg_pt_gp_alua_supported_states =
1739             ALUA_T_SUP | ALUA_O_SUP |
1740             ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1741
1742         if (def_group) {
1743                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1744                 tg_pt_gp->tg_pt_gp_id =
1745                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1746                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1747                 dev->t10_alua.alua_tg_pt_gps_count++;
1748                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1749                               &dev->t10_alua.tg_pt_gps_list);
1750                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1751         }
1752
1753         return tg_pt_gp;
1754 }
1755
1756 int core_alua_set_tg_pt_gp_id(
1757         struct t10_alua_tg_pt_gp *tg_pt_gp,
1758         u16 tg_pt_gp_id)
1759 {
1760         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1761         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1762         u16 tg_pt_gp_id_tmp;
1763
1764         /*
1765          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1766          */
1767         if (tg_pt_gp->tg_pt_gp_valid_id) {
1768                 pr_warn("ALUA TG PT Group already has a valid ID,"
1769                         " ignoring request\n");
1770                 return -EINVAL;
1771         }
1772
1773         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1774         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1775                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1776                         " 0x0000ffff reached\n");
1777                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1778                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1779                 return -ENOSPC;
1780         }
1781 again:
1782         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1783                         dev->t10_alua.alua_tg_pt_gps_counter++;
1784
1785         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1786                         tg_pt_gp_list) {
1787                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1788                         if (!tg_pt_gp_id)
1789                                 goto again;
1790
1791                         pr_err("ALUA Target Port Group ID: %hu already"
1792                                 " exists, ignoring request\n", tg_pt_gp_id);
1793                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1794                         return -EINVAL;
1795                 }
1796         }
1797
1798         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1799         tg_pt_gp->tg_pt_gp_valid_id = 1;
1800         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1801                         &dev->t10_alua.tg_pt_gps_list);
1802         dev->t10_alua.alua_tg_pt_gps_count++;
1803         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1804
1805         return 0;
1806 }
1807
1808 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1809         struct se_port *port)
1810 {
1811         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1812
1813         tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1814                                 GFP_KERNEL);
1815         if (!tg_pt_gp_mem) {
1816                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1817                 return ERR_PTR(-ENOMEM);
1818         }
1819         INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1820         spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1821         atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1822
1823         tg_pt_gp_mem->tg_pt = port;
1824         port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1825
1826         return tg_pt_gp_mem;
1827 }
1828
1829 void core_alua_free_tg_pt_gp(
1830         struct t10_alua_tg_pt_gp *tg_pt_gp)
1831 {
1832         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1833         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1834
1835         /*
1836          * Once we have reached this point, config_item_put() has already
1837          * been called from target_core_alua_drop_tg_pt_gp().
1838          *
1839          * Here we remove *tg_pt_gp from the global list so that
1840          * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1841          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1842          */
1843         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1844         list_del(&tg_pt_gp->tg_pt_gp_list);
1845         dev->t10_alua.alua_tg_pt_gps_counter--;
1846         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1847
1848         flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1849
1850         /*
1851          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1852          * core_alua_get_tg_pt_gp_by_name() in
1853          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1854          * to be released with core_alua_put_tg_pt_gp_from_name().
1855          */
1856         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1857                 cpu_relax();
1858
1859         /*
1860          * Release reference to struct t10_alua_tg_pt_gp from all associated
1861          * struct se_port.
1862          */
1863         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1864         list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1865                         &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1866                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1867                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1868                         tg_pt_gp->tg_pt_gp_members--;
1869                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1870                 }
1871                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1872                 /*
1873                  * tg_pt_gp_mem is associated with a single
1874                  * se_port->sep_alua_tg_pt_gp_mem, and is released via
1875                  * core_alua_free_tg_pt_gp_mem().
1876                  *
1877                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1878                  * assume we want to re-associate a given tg_pt_gp_mem with
1879                  * default_tg_pt_gp.
1880                  */
1881                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1882                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1883                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1884                                         dev->t10_alua.default_tg_pt_gp);
1885                 } else
1886                         tg_pt_gp_mem->tg_pt_gp = NULL;
1887                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1888
1889                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1890         }
1891         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1892
1893         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1894 }
1895
1896 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1897 {
1898         struct t10_alua_tg_pt_gp *tg_pt_gp;
1899         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1900
1901         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1902         if (!tg_pt_gp_mem)
1903                 return;
1904
1905         while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1906                 cpu_relax();
1907
1908         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1909         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1910         if (tg_pt_gp) {
1911                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1912                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1913                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1914                         tg_pt_gp->tg_pt_gp_members--;
1915                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1916                 }
1917                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1918                 tg_pt_gp_mem->tg_pt_gp = NULL;
1919         }
1920         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1921
1922         kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1923 }
1924
1925 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1926                 struct se_device *dev, const char *name)
1927 {
1928         struct t10_alua_tg_pt_gp *tg_pt_gp;
1929         struct config_item *ci;
1930
1931         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1932         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1933                         tg_pt_gp_list) {
1934                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1935                         continue;
1936                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1937                 if (!strcmp(config_item_name(ci), name)) {
1938                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1939                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1940                         return tg_pt_gp;
1941                 }
1942         }
1943         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1944
1945         return NULL;
1946 }
1947
1948 static void core_alua_put_tg_pt_gp_from_name(
1949         struct t10_alua_tg_pt_gp *tg_pt_gp)
1950 {
1951         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1952
1953         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1954         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1955         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1956 }
1957
1958 /*
1959  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1960  */
1961 void __core_alua_attach_tg_pt_gp_mem(
1962         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1963         struct t10_alua_tg_pt_gp *tg_pt_gp)
1964 {
1965         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1966         tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1967         tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1968         list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1969                         &tg_pt_gp->tg_pt_gp_mem_list);
1970         tg_pt_gp->tg_pt_gp_members++;
1971         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1972 }
1973
1974 /*
1975  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1976  */
1977 static void __core_alua_drop_tg_pt_gp_mem(
1978         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1979         struct t10_alua_tg_pt_gp *tg_pt_gp)
1980 {
1981         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1982         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1983         tg_pt_gp_mem->tg_pt_gp = NULL;
1984         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1985         tg_pt_gp->tg_pt_gp_members--;
1986         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1987 }
1988
1989 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1990 {
1991         struct config_item *tg_pt_ci;
1992         struct t10_alua_tg_pt_gp *tg_pt_gp;
1993         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1994         ssize_t len = 0;
1995
1996         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1997         if (!tg_pt_gp_mem)
1998                 return len;
1999
2000         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2001         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2002         if (tg_pt_gp) {
2003                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
2004                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
2005                         " %hu\nTG Port Primary Access State: %s\nTG Port "
2006                         "Primary Access Status: %s\nTG Port Secondary Access"
2007                         " State: %s\nTG Port Secondary Access Status: %s\n",
2008                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
2009                         core_alua_dump_state(atomic_read(
2010                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
2011                         core_alua_dump_status(
2012                                 tg_pt_gp->tg_pt_gp_alua_access_status),
2013                         (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2014                         "Offline" : "None",
2015                         core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2016         }
2017         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2018
2019         return len;
2020 }
2021
2022 ssize_t core_alua_store_tg_pt_gp_info(
2023         struct se_port *port,
2024         const char *page,
2025         size_t count)
2026 {
2027         struct se_portal_group *tpg;
2028         struct se_lun *lun;
2029         struct se_device *dev = port->sep_lun->lun_se_dev;
2030         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2031         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2032         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2033         int move = 0;
2034
2035         tpg = port->sep_tpg;
2036         lun = port->sep_lun;
2037
2038         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2039         if (!tg_pt_gp_mem)
2040                 return 0;
2041
2042         if (count > TG_PT_GROUP_NAME_BUF) {
2043                 pr_err("ALUA Target Port Group alias too large!\n");
2044                 return -EINVAL;
2045         }
2046         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2047         memcpy(buf, page, count);
2048         /*
2049          * Any ALUA target port group alias besides "NULL" means we will be
2050          * making a new group association.
2051          */
2052         if (strcmp(strstrip(buf), "NULL")) {
2053                 /*
2054                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
2055                  * struct t10_alua_tg_pt_gp.  This reference is released with
2056                  * core_alua_put_tg_pt_gp_from_name() below.
2057                  */
2058                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2059                                         strstrip(buf));
2060                 if (!tg_pt_gp_new)
2061                         return -ENODEV;
2062         }
2063
2064         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2065         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2066         if (tg_pt_gp) {
2067                 /*
2068                  * Clearing an existing tg_pt_gp association, and replacing
2069                  * with the default_tg_pt_gp.
2070                  */
2071                 if (!tg_pt_gp_new) {
2072                         pr_debug("Target_Core_ConfigFS: Moving"
2073                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2074                                 " alua/%s, ID: %hu back to"
2075                                 " default_tg_pt_gp\n",
2076                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2077                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2078                                 config_item_name(&lun->lun_group.cg_item),
2079                                 config_item_name(
2080                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
2081                                 tg_pt_gp->tg_pt_gp_id);
2082
2083                         __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2084                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2085                                         dev->t10_alua.default_tg_pt_gp);
2086                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2087
2088                         return count;
2089                 }
2090                 /*
2091                  * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2092                  */
2093                 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2094                 move = 1;
2095         }
2096         /*
2097          * Associate tg_pt_gp_mem with tg_pt_gp_new.
2098          */
2099         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2100         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2101         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2102                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2103                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2104                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2105                 config_item_name(&lun->lun_group.cg_item),
2106                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2107                 tg_pt_gp_new->tg_pt_gp_id);
2108
2109         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2110         return count;
2111 }
2112
2113 ssize_t core_alua_show_access_type(
2114         struct t10_alua_tg_pt_gp *tg_pt_gp,
2115         char *page)
2116 {
2117         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2118             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2119                 return sprintf(page, "Implicit and Explicit\n");
2120         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2121                 return sprintf(page, "Implicit\n");
2122         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2123                 return sprintf(page, "Explicit\n");
2124         else
2125                 return sprintf(page, "None\n");
2126 }
2127
2128 ssize_t core_alua_store_access_type(
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 alua_access_type\n");
2139                 return ret;
2140         }
2141         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2142                 pr_err("Illegal value for alua_access_type:"
2143                                 " %lu\n", tmp);
2144                 return -EINVAL;
2145         }
2146         if (tmp == 3)
2147                 tg_pt_gp->tg_pt_gp_alua_access_type =
2148                         TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2149         else if (tmp == 2)
2150                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2151         else if (tmp == 1)
2152                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2153         else
2154                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2155
2156         return count;
2157 }
2158
2159 ssize_t core_alua_show_nonop_delay_msecs(
2160         struct t10_alua_tg_pt_gp *tg_pt_gp,
2161         char *page)
2162 {
2163         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2164 }
2165
2166 ssize_t core_alua_store_nonop_delay_msecs(
2167         struct t10_alua_tg_pt_gp *tg_pt_gp,
2168         const char *page,
2169         size_t count)
2170 {
2171         unsigned long tmp;
2172         int ret;
2173
2174         ret = kstrtoul(page, 0, &tmp);
2175         if (ret < 0) {
2176                 pr_err("Unable to extract nonop_delay_msecs\n");
2177                 return ret;
2178         }
2179         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2180                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2181                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2182                         ALUA_MAX_NONOP_DELAY_MSECS);
2183                 return -EINVAL;
2184         }
2185         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2186
2187         return count;
2188 }
2189
2190 ssize_t core_alua_show_trans_delay_msecs(
2191         struct t10_alua_tg_pt_gp *tg_pt_gp,
2192         char *page)
2193 {
2194         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2195 }
2196
2197 ssize_t core_alua_store_trans_delay_msecs(
2198         struct t10_alua_tg_pt_gp *tg_pt_gp,
2199         const char *page,
2200         size_t count)
2201 {
2202         unsigned long tmp;
2203         int ret;
2204
2205         ret = kstrtoul(page, 0, &tmp);
2206         if (ret < 0) {
2207                 pr_err("Unable to extract trans_delay_msecs\n");
2208                 return ret;
2209         }
2210         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2211                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2212                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2213                         ALUA_MAX_TRANS_DELAY_MSECS);
2214                 return -EINVAL;
2215         }
2216         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2217
2218         return count;
2219 }
2220
2221 ssize_t core_alua_show_implicit_trans_secs(
2222         struct t10_alua_tg_pt_gp *tg_pt_gp,
2223         char *page)
2224 {
2225         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2226 }
2227
2228 ssize_t core_alua_store_implicit_trans_secs(
2229         struct t10_alua_tg_pt_gp *tg_pt_gp,
2230         const char *page,
2231         size_t count)
2232 {
2233         unsigned long tmp;
2234         int ret;
2235
2236         ret = kstrtoul(page, 0, &tmp);
2237         if (ret < 0) {
2238                 pr_err("Unable to extract implicit_trans_secs\n");
2239                 return ret;
2240         }
2241         if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2242                 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2243                         " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2244                         ALUA_MAX_IMPLICIT_TRANS_SECS);
2245                 return  -EINVAL;
2246         }
2247         tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2248
2249         return count;
2250 }
2251
2252 ssize_t core_alua_show_preferred_bit(
2253         struct t10_alua_tg_pt_gp *tg_pt_gp,
2254         char *page)
2255 {
2256         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2257 }
2258
2259 ssize_t core_alua_store_preferred_bit(
2260         struct t10_alua_tg_pt_gp *tg_pt_gp,
2261         const char *page,
2262         size_t count)
2263 {
2264         unsigned long tmp;
2265         int ret;
2266
2267         ret = kstrtoul(page, 0, &tmp);
2268         if (ret < 0) {
2269                 pr_err("Unable to extract preferred ALUA value\n");
2270                 return ret;
2271         }
2272         if ((tmp != 0) && (tmp != 1)) {
2273                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2274                 return -EINVAL;
2275         }
2276         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2277
2278         return count;
2279 }
2280
2281 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2282 {
2283         if (!lun->lun_sep)
2284                 return -ENODEV;
2285
2286         return sprintf(page, "%d\n",
2287                 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2288 }
2289
2290 ssize_t core_alua_store_offline_bit(
2291         struct se_lun *lun,
2292         const char *page,
2293         size_t count)
2294 {
2295         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2296         unsigned long tmp;
2297         int ret;
2298
2299         if (!lun->lun_sep)
2300                 return -ENODEV;
2301
2302         ret = kstrtoul(page, 0, &tmp);
2303         if (ret < 0) {
2304                 pr_err("Unable to extract alua_tg_pt_offline value\n");
2305                 return ret;
2306         }
2307         if ((tmp != 0) && (tmp != 1)) {
2308                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2309                                 tmp);
2310                 return -EINVAL;
2311         }
2312         tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2313         if (!tg_pt_gp_mem) {
2314                 pr_err("Unable to locate *tg_pt_gp_mem\n");
2315                 return -EINVAL;
2316         }
2317
2318         ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2319                         lun->lun_sep, 0, (int)tmp);
2320         if (ret < 0)
2321                 return -EINVAL;
2322
2323         return count;
2324 }
2325
2326 ssize_t core_alua_show_secondary_status(
2327         struct se_lun *lun,
2328         char *page)
2329 {
2330         return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2331 }
2332
2333 ssize_t core_alua_store_secondary_status(
2334         struct se_lun *lun,
2335         const char *page,
2336         size_t count)
2337 {
2338         unsigned long tmp;
2339         int ret;
2340
2341         ret = kstrtoul(page, 0, &tmp);
2342         if (ret < 0) {
2343                 pr_err("Unable to extract alua_tg_pt_status\n");
2344                 return ret;
2345         }
2346         if ((tmp != ALUA_STATUS_NONE) &&
2347             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2348             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2349                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2350                                 tmp);
2351                 return -EINVAL;
2352         }
2353         lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2354
2355         return count;
2356 }
2357
2358 ssize_t core_alua_show_secondary_write_metadata(
2359         struct se_lun *lun,
2360         char *page)
2361 {
2362         return sprintf(page, "%d\n",
2363                         lun->lun_sep->sep_tg_pt_secondary_write_md);
2364 }
2365
2366 ssize_t core_alua_store_secondary_write_metadata(
2367         struct se_lun *lun,
2368         const char *page,
2369         size_t count)
2370 {
2371         unsigned long tmp;
2372         int ret;
2373
2374         ret = kstrtoul(page, 0, &tmp);
2375         if (ret < 0) {
2376                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2377                 return ret;
2378         }
2379         if ((tmp != 0) && (tmp != 1)) {
2380                 pr_err("Illegal value for alua_tg_pt_write_md:"
2381                                 " %lu\n", tmp);
2382                 return -EINVAL;
2383         }
2384         lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2385
2386         return count;
2387 }
2388
2389 int core_setup_alua(struct se_device *dev)
2390 {
2391         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2392             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2393                 struct t10_alua_lu_gp_member *lu_gp_mem;
2394
2395                 /*
2396                  * Associate this struct se_device with the default ALUA
2397                  * LUN Group.
2398                  */
2399                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2400                 if (IS_ERR(lu_gp_mem))
2401                         return PTR_ERR(lu_gp_mem);
2402
2403                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2404                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2405                                 default_lu_gp);
2406                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2407
2408                 pr_debug("%s: Adding to default ALUA LU Group:"
2409                         " core/alua/lu_gps/default_lu_gp\n",
2410                         dev->transport->name);
2411         }
2412
2413         return 0;
2414 }