kernel/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_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 396
 397                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 398
 399                                 if (!core_alua_do_port_transition(tg_pt_gp,
 400                                                 dev, l_port, nacl,
 401                                                 alua_access_state, 1))
 402                                         found = true;
 403
 404                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 405                                 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
 406                                 break;
 407                         }
 408                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 409                 } else {
 410                         /*
 411                          * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
 412                          * the Target Port in question for the the incoming
 413                          * SET_TARGET_PORT_GROUPS op.
 414                          */
 415                         rtpi = get_unaligned_be16(ptr + 2);
 416                         /*
 417                          * Locate the matching relative target port identifier
 418                          * for the struct se_device storage object.
 419                          */
 420                         spin_lock(&dev->se_port_lock);
 421                         list_for_each_entry(port, &dev->dev_sep_list,
 422                                                         sep_list) {
 423                                 if (port->sep_rtpi != rtpi)
 424                                         continue;
 425
 426                                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 427
 428                                 spin_unlock(&dev->se_port_lock);
 429
 430                                 if (!core_alua_set_tg_pt_secondary_state(
 431                                                 tg_pt_gp_mem, port, 1, 1))
 432                                         found = true;
 433
 434                                 spin_lock(&dev->se_port_lock);
 435                                 break;
 436                         }
 437                         spin_unlock(&dev->se_port_lock);
 438                 }
 439
 440                 if (!found) {
 441                         rc = TCM_INVALID_PARAMETER_LIST;
 442                         goto out;
 443                 }
 444
 445                 ptr += 4;
 446                 len += 4;
 447         }
 448
 449 out:
 450         transport_kunmap_data_sg(cmd);
 451         if (!rc)
 452                 target_complete_cmd(cmd, GOOD);
 453         return rc;
 454 }
 455
 456 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
 457 {
 458         /*
 459          * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 460          * The ALUA additional sense code qualifier (ASCQ) is determined
 461          * by the ALUA primary or secondary access state..
 462          */
 463         pr_debug("[%s]: ALUA TG Port not available, "
 464                 "SenseKey: NOT_READY, ASC/ASCQ: "
 465                 "0x04/0x%02x\n",
 466                 cmd->se_tfo->get_fabric_name(), alua_ascq);
 467
 468         cmd->scsi_asc = 0x04;
 469         cmd->scsi_ascq = alua_ascq;
 470 }
 471
 472 static inline void core_alua_state_nonoptimized(
 473         struct se_cmd *cmd,
 474         unsigned char *cdb,
 475         int nonop_delay_msecs)
 476 {
 477         /*
 478          * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
 479          * later to determine if processing of this cmd needs to be
 480          * temporarily delayed for the Active/NonOptimized primary access state.
 481          */
 482         cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
 483         cmd->alua_nonop_delay = nonop_delay_msecs;
 484 }
 485
 486 static inline int core_alua_state_lba_dependent(
 487         struct se_cmd *cmd,
 488         struct t10_alua_tg_pt_gp *tg_pt_gp)
 489 {
 490         struct se_device *dev = cmd->se_dev;
 491         u64 segment_size, segment_mult, sectors, lba;
 492
 493         /* Only need to check for cdb actually containing LBAs */
 494         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
 495                 return 0;
 496
 497         spin_lock(&dev->t10_alua.lba_map_lock);
 498         segment_size = dev->t10_alua.lba_map_segment_size;
 499         segment_mult = dev->t10_alua.lba_map_segment_multiplier;
 500         sectors = cmd->data_length / dev->dev_attrib.block_size;
 501
 502         lba = cmd->t_task_lba;
 503         while (lba < cmd->t_task_lba + sectors) {
 504                 struct t10_alua_lba_map *cur_map = NULL, *map;
 505                 struct t10_alua_lba_map_member *map_mem;
 506
 507                 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
 508                                     lba_map_list) {
 509                         u64 start_lba, last_lba;
 510                         u64 first_lba = map->lba_map_first_lba;
 511
 512                         if (segment_mult) {
 513                                 u64 tmp = lba;
 514                                 start_lba = do_div(tmp, segment_size * segment_mult);
 515
 516                                 last_lba = first_lba + segment_size - 1;
 517                                 if (start_lba >= first_lba &&
 518                                     start_lba <= last_lba) {
 519                                         lba += segment_size;
 520                                         cur_map = map;
 521                                         break;
 522                                 }
 523                         } else {
 524                                 last_lba = map->lba_map_last_lba;
 525                                 if (lba >= first_lba && lba <= last_lba) {
 526                                         lba = last_lba + 1;
 527                                         cur_map = map;
 528                                         break;
 529                                 }
 530                         }
 531                 }
 532                 if (!cur_map) {
 533                         spin_unlock(&dev->t10_alua.lba_map_lock);
 534                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 535                         return 1;
 536                 }
 537                 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
 538                                     lba_map_mem_list) {
 539                         if (map_mem->lba_map_mem_alua_pg_id !=
 540                             tg_pt_gp->tg_pt_gp_id)
 541                                 continue;
 542                         switch(map_mem->lba_map_mem_alua_state) {
 543                         case ALUA_ACCESS_STATE_STANDBY:
 544                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 545                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 546                                 return 1;
 547                         case ALUA_ACCESS_STATE_UNAVAILABLE:
 548                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 549                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 550                                 return 1;
 551                         default:
 552                                 break;
 553                         }
 554                 }
 555         }
 556         spin_unlock(&dev->t10_alua.lba_map_lock);
 557         return 0;
 558 }
 559
 560 static inline int core_alua_state_standby(
 561         struct se_cmd *cmd,
 562         unsigned char *cdb)
 563 {
 564         /*
 565          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 566          * spc4r17 section 5.9.2.4.4
 567          */
 568         switch (cdb[0]) {
 569         case INQUIRY:
 570         case LOG_SELECT:
 571         case LOG_SENSE:
 572         case MODE_SELECT:
 573         case MODE_SENSE:
 574         case REPORT_LUNS:
 575         case RECEIVE_DIAGNOSTIC:
 576         case SEND_DIAGNOSTIC:
 577         case READ_CAPACITY:
 578                 return 0;
 579         case SERVICE_ACTION_IN_16:
 580                 switch (cdb[1] & 0x1f) {
 581                 case SAI_READ_CAPACITY_16:
 582                         return 0;
 583                 default:
 584                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 585                         return 1;
 586                 }
 587         case MAINTENANCE_IN:
 588                 switch (cdb[1] & 0x1f) {
 589                 case MI_REPORT_TARGET_PGS:
 590                         return 0;
 591                 default:
 592                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 593                         return 1;
 594                 }
 595         case MAINTENANCE_OUT:
 596                 switch (cdb[1]) {
 597                 case MO_SET_TARGET_PGS:
 598                         return 0;
 599                 default:
 600                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 601                         return 1;
 602                 }
 603         case REQUEST_SENSE:
 604         case PERSISTENT_RESERVE_IN:
 605         case PERSISTENT_RESERVE_OUT:
 606         case READ_BUFFER:
 607         case WRITE_BUFFER:
 608                 return 0;
 609         default:
 610                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 611                 return 1;
 612         }
 613
 614         return 0;
 615 }
 616
 617 static inline int core_alua_state_unavailable(
 618         struct se_cmd *cmd,
 619         unsigned char *cdb)
 620 {
 621         /*
 622          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 623          * spc4r17 section 5.9.2.4.5
 624          */
 625         switch (cdb[0]) {
 626         case INQUIRY:
 627         case REPORT_LUNS:
 628                 return 0;
 629         case MAINTENANCE_IN:
 630                 switch (cdb[1] & 0x1f) {
 631                 case MI_REPORT_TARGET_PGS:
 632                         return 0;
 633                 default:
 634                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 635                         return 1;
 636                 }
 637         case MAINTENANCE_OUT:
 638                 switch (cdb[1]) {
 639                 case MO_SET_TARGET_PGS:
 640                         return 0;
 641                 default:
 642                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 643                         return 1;
 644                 }
 645         case REQUEST_SENSE:
 646         case READ_BUFFER:
 647         case WRITE_BUFFER:
 648                 return 0;
 649         default:
 650                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 651                 return 1;
 652         }
 653
 654         return 0;
 655 }
 656
 657 static inline int core_alua_state_transition(
 658         struct se_cmd *cmd,
 659         unsigned char *cdb)
 660 {
 661         /*
 662          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
 663          * spc4r17 section 5.9.2.5
 664          */
 665         switch (cdb[0]) {
 666         case INQUIRY:
 667         case REPORT_LUNS:
 668                 return 0;
 669         case MAINTENANCE_IN:
 670                 switch (cdb[1] & 0x1f) {
 671                 case MI_REPORT_TARGET_PGS:
 672                         return 0;
 673                 default:
 674                         set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 675                         return 1;
 676                 }
 677         case REQUEST_SENSE:
 678         case READ_BUFFER:
 679         case WRITE_BUFFER:
 680                 return 0;
 681         default:
 682                 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 683                 return 1;
 684         }
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * return 1: Is used to signal LUN not accessible, and check condition/not ready
 691  * return 0: Used to signal success
 692  * return -1: Used to signal failure, and invalid cdb field
 693  */
 694 sense_reason_t
 695 target_alua_state_check(struct se_cmd *cmd)
 696 {
 697         struct se_device *dev = cmd->se_dev;
 698         unsigned char *cdb = cmd->t_task_cdb;
 699         struct se_lun *lun = cmd->se_lun;
 700         struct se_port *port = lun->lun_sep;
 701         struct t10_alua_tg_pt_gp *tg_pt_gp;
 702         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 703         int out_alua_state, nonop_delay_msecs;
 704
 705         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 706                 return 0;
 707         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
 708                 return 0;
 709
 710         if (!port)
 711                 return 0;
 712         /*
 713          * First, check for a struct se_port specific secondary ALUA target port
 714          * access state: OFFLINE
 715          */
 716         if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
 717                 pr_debug("ALUA: Got secondary offline status for local"
 718                                 " target port\n");
 719                 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
 720                 return TCM_CHECK_CONDITION_NOT_READY;
 721         }
 722          /*
 723          * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
 724          * ALUA target port group, to obtain current ALUA access state.
 725          * Otherwise look for the underlying struct se_device association with
 726          * a ALUA logical unit group.
 727          */
 728         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 729         if (!tg_pt_gp_mem)
 730                 return 0;
 731
 732         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 733         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 734         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 735         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 736         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 737         /*
 738          * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
 739          * statement so the compiler knows explicitly to check this case first.
 740          * For the Optimized ALUA access state case, we want to process the
 741          * incoming fabric cmd ASAP..
 742          */
 743         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
 744                 return 0;
 745
 746         switch (out_alua_state) {
 747         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 748                 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
 749                 break;
 750         case ALUA_ACCESS_STATE_STANDBY:
 751                 if (core_alua_state_standby(cmd, cdb))
 752                         return TCM_CHECK_CONDITION_NOT_READY;
 753                 break;
 754         case ALUA_ACCESS_STATE_UNAVAILABLE:
 755                 if (core_alua_state_unavailable(cmd, cdb))
 756                         return TCM_CHECK_CONDITION_NOT_READY;
 757                 break;
 758         case ALUA_ACCESS_STATE_TRANSITION:
 759                 if (core_alua_state_transition(cmd, cdb))
 760                         return TCM_CHECK_CONDITION_NOT_READY;
 761                 break;
 762         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 763                 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
 764                         return TCM_CHECK_CONDITION_NOT_READY;
 765                 break;
 766         /*
 767          * OFFLINE is a secondary ALUA target port group access state, that is
 768          * handled above with struct se_port->sep_tg_pt_secondary_offline=1
 769          */
 770         case ALUA_ACCESS_STATE_OFFLINE:
 771         default:
 772                 pr_err("Unknown ALUA access state: 0x%02x\n",
 773                                 out_alua_state);
 774                 return TCM_INVALID_CDB_FIELD;
 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_mb(&mem->tg_pt_gp_mem_ref_cnt);
1000                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1001
1002                 spin_lock_bh(&port->sep_alua_lock);
1003                 list_for_each_entry(se_deve, &port->sep_alua_list,
1004                                         alua_port_list) {
1005                         lacl = se_deve->se_lun_acl;
1006                         /*
1007                          * se_deve->se_lun_acl pointer may be NULL for a
1008                          * entry created without explicit Node+MappedLUN ACLs
1009                          */
1010                         if (!lacl)
1011                                 continue;
1012
1013                         if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1014                              ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1015                            (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1016                             (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1017                            (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1018                             (tg_pt_gp->tg_pt_gp_alua_port == port))
1019                                 continue;
1020
1021                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
1022                                 se_deve->mapped_lun, 0x2A,
1023                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1024                 }
1025                 spin_unlock_bh(&port->sep_alua_lock);
1026
1027                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1028                 atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt);
1029         }
1030         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1031         /*
1032          * Update the ALUA metadata buf that has been allocated in
1033          * core_alua_do_port_transition(), this metadata will be written
1034          * to struct file.
1035          *
1036          * Note that there is the case where we do not want to update the
1037          * metadata when the saved metadata is being parsed in userspace
1038          * when setting the existing port access state and access status.
1039          *
1040          * Also note that the failure to write out the ALUA metadata to
1041          * struct file does NOT affect the actual ALUA transition.
1042          */
1043         if (tg_pt_gp->tg_pt_gp_write_metadata) {
1044                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1045                 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1046                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1047         }
1048         /*
1049          * Set the current primary ALUA access state to the requested new state
1050          */
1051         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1052                    tg_pt_gp->tg_pt_gp_alua_pending_state);
1053
1054         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1055                 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1056                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1057                 tg_pt_gp->tg_pt_gp_id,
1058                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1059                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1060         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1061         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1062         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1063
1064         if (tg_pt_gp->tg_pt_gp_transition_complete)
1065                 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1066 }
1067
1068 static int core_alua_do_transition_tg_pt(
1069         struct t10_alua_tg_pt_gp *tg_pt_gp,
1070         int new_state,
1071         int explicit)
1072 {
1073         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1074         DECLARE_COMPLETION_ONSTACK(wait);
1075
1076         /* Nothing to be done here */
1077         if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1078                 return 0;
1079
1080         if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1081                 return -EAGAIN;
1082
1083         /*
1084          * Flush any pending transitions
1085          */
1086         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1087             atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1088             ALUA_ACCESS_STATE_TRANSITION) {
1089                 /* Just in case */
1090                 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1091                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1092                 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1093                 wait_for_completion(&wait);
1094                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1095                 return 0;
1096         }
1097
1098         /*
1099          * Save the old primary ALUA access state, and set the current state
1100          * to ALUA_ACCESS_STATE_TRANSITION.
1101          */
1102         tg_pt_gp->tg_pt_gp_alua_previous_state =
1103                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1104         tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1105
1106         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1107                         ALUA_ACCESS_STATE_TRANSITION);
1108         tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1109                                 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1110                                 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1111
1112         /*
1113          * Check for the optional ALUA primary state transition delay
1114          */
1115         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1116                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1117
1118         /*
1119          * Take a reference for workqueue item
1120          */
1121         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1122         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1123         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1124
1125         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1126                 unsigned long transition_tmo;
1127
1128                 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1129                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1130                                    &tg_pt_gp->tg_pt_gp_transition_work,
1131                                    transition_tmo);
1132         } else {
1133                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1134                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1135                                    &tg_pt_gp->tg_pt_gp_transition_work, 0);
1136                 wait_for_completion(&wait);
1137                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1138         }
1139
1140         return 0;
1141 }
1142
1143 int core_alua_do_port_transition(
1144         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1145         struct se_device *l_dev,
1146         struct se_port *l_port,
1147         struct se_node_acl *l_nacl,
1148         int new_state,
1149         int explicit)
1150 {
1151         struct se_device *dev;
1152         struct t10_alua_lu_gp *lu_gp;
1153         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1154         struct t10_alua_tg_pt_gp *tg_pt_gp;
1155         int primary, valid_states, rc = 0;
1156
1157         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1158         if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1159                 return -EINVAL;
1160
1161         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1162         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1163         lu_gp = local_lu_gp_mem->lu_gp;
1164         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1165         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1166         /*
1167          * For storage objects that are members of the 'default_lu_gp',
1168          * we only do transition on the passed *l_tp_pt_gp, and not
1169          * on all of the matching target port groups IDs in default_lu_gp.
1170          */
1171         if (!lu_gp->lu_gp_id) {
1172                 /*
1173                  * core_alua_do_transition_tg_pt() will always return
1174                  * success.
1175                  */
1176                 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1177                 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1178                 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1179                                                    new_state, explicit);
1180                 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1181                 return rc;
1182         }
1183         /*
1184          * For all other LU groups aside from 'default_lu_gp', walk all of
1185          * the associated storage objects looking for a matching target port
1186          * group ID from the local target port group.
1187          */
1188         spin_lock(&lu_gp->lu_gp_lock);
1189         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1190                                 lu_gp_mem_list) {
1191
1192                 dev = lu_gp_mem->lu_gp_mem_dev;
1193                 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1194                 spin_unlock(&lu_gp->lu_gp_lock);
1195
1196                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1197                 list_for_each_entry(tg_pt_gp,
1198                                 &dev->t10_alua.tg_pt_gps_list,
1199                                 tg_pt_gp_list) {
1200
1201                         if (!tg_pt_gp->tg_pt_gp_valid_id)
1202                                 continue;
1203                         /*
1204                          * If the target behavior port asymmetric access state
1205                          * is changed for any target port group accessible via
1206                          * a logical unit within a LU group, the target port
1207                          * behavior group asymmetric access states for the same
1208                          * target port group accessible via other logical units
1209                          * in that LU group will also change.
1210                          */
1211                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1212                                 continue;
1213
1214                         if (l_tg_pt_gp == tg_pt_gp) {
1215                                 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1216                                 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1217                         } else {
1218                                 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1219                                 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1220                         }
1221                         atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1222                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1223                         /*
1224                          * core_alua_do_transition_tg_pt() will always return
1225                          * success.
1226                          */
1227                         rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1228                                         new_state, explicit);
1229
1230                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1231                         atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1232                         if (rc)
1233                                 break;
1234                 }
1235                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1236
1237                 spin_lock(&lu_gp->lu_gp_lock);
1238                 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1239         }
1240         spin_unlock(&lu_gp->lu_gp_lock);
1241
1242         if (!rc) {
1243                 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1244                          " Group IDs: %hu %s transition to primary state: %s\n",
1245                          config_item_name(&lu_gp->lu_gp_group.cg_item),
1246                          l_tg_pt_gp->tg_pt_gp_id,
1247                          (explicit) ? "explicit" : "implicit",
1248                          core_alua_dump_state(new_state));
1249         }
1250
1251         atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1252         return rc;
1253 }
1254
1255 /*
1256  * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1257  */
1258 static int core_alua_update_tpg_secondary_metadata(
1259         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1260         struct se_port *port)
1261 {
1262         unsigned char *md_buf;
1263         struct se_portal_group *se_tpg = port->sep_tpg;
1264         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1265         int len, rc;
1266
1267         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1268         if (!md_buf) {
1269                 pr_err("Unable to allocate buf for ALUA metadata\n");
1270                 return -ENOMEM;
1271         }
1272
1273         memset(path, 0, ALUA_METADATA_PATH_LEN);
1274         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1275
1276         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1277                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1278
1279         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1280                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1281                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1282
1283         len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1284                         "alua_tg_pt_status=0x%02x\n",
1285                         atomic_read(&port->sep_tg_pt_secondary_offline),
1286                         port->sep_tg_pt_secondary_stat);
1287
1288         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1289                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1290                         port->sep_lun->unpacked_lun);
1291
1292         rc = core_alua_write_tpg_metadata(path, md_buf, len);
1293         kfree(md_buf);
1294
1295         return rc;
1296 }
1297
1298 static int core_alua_set_tg_pt_secondary_state(
1299         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1300         struct se_port *port,
1301         int explicit,
1302         int offline)
1303 {
1304         struct t10_alua_tg_pt_gp *tg_pt_gp;
1305         int trans_delay_msecs;
1306
1307         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1308         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1309         if (!tg_pt_gp) {
1310                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1311                 pr_err("Unable to complete secondary state"
1312                                 " transition\n");
1313                 return -EINVAL;
1314         }
1315         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1316         /*
1317          * Set the secondary ALUA target port access state to OFFLINE
1318          * or release the previously secondary state for struct se_port
1319          */
1320         if (offline)
1321                 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1322         else
1323                 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1324
1325         port->sep_tg_pt_secondary_stat = (explicit) ?
1326                         ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1327                         ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1328
1329         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1330                 " to secondary access state: %s\n", (explicit) ? "explicit" :
1331                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1332                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1333
1334         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1335         /*
1336          * Do the optional transition delay after we set the secondary
1337          * ALUA access state.
1338          */
1339         if (trans_delay_msecs != 0)
1340                 msleep_interruptible(trans_delay_msecs);
1341         /*
1342          * See if we need to update the ALUA fabric port metadata for
1343          * secondary state and status
1344          */
1345         if (port->sep_tg_pt_secondary_write_md) {
1346                 mutex_lock(&port->sep_tg_pt_md_mutex);
1347                 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1348                 mutex_unlock(&port->sep_tg_pt_md_mutex);
1349         }
1350
1351         return 0;
1352 }
1353
1354 struct t10_alua_lba_map *
1355 core_alua_allocate_lba_map(struct list_head *list,
1356                            u64 first_lba, u64 last_lba)
1357 {
1358         struct t10_alua_lba_map *lba_map;
1359
1360         lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1361         if (!lba_map) {
1362                 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1363                 return ERR_PTR(-ENOMEM);
1364         }
1365         INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1366         lba_map->lba_map_first_lba = first_lba;
1367         lba_map->lba_map_last_lba = last_lba;
1368
1369         list_add_tail(&lba_map->lba_map_list, list);
1370         return lba_map;
1371 }
1372
1373 int
1374 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1375                                int pg_id, int state)
1376 {
1377         struct t10_alua_lba_map_member *lba_map_mem;
1378
1379         list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1380                             lba_map_mem_list) {
1381                 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1382                         pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1383                         return -EINVAL;
1384                 }
1385         }
1386
1387         lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1388         if (!lba_map_mem) {
1389                 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1390                 return -ENOMEM;
1391         }
1392         lba_map_mem->lba_map_mem_alua_state = state;
1393         lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1394
1395         list_add_tail(&lba_map_mem->lba_map_mem_list,
1396                       &lba_map->lba_map_mem_list);
1397         return 0;
1398 }
1399
1400 void
1401 core_alua_free_lba_map(struct list_head *lba_list)
1402 {
1403         struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1404         struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1405
1406         list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1407                                  lba_map_list) {
1408                 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1409                                          &lba_map->lba_map_mem_list,
1410                                          lba_map_mem_list) {
1411                         list_del(&lba_map_mem->lba_map_mem_list);
1412                         kmem_cache_free(t10_alua_lba_map_mem_cache,
1413                                         lba_map_mem);
1414                 }
1415                 list_del(&lba_map->lba_map_list);
1416                 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1417         }
1418 }
1419
1420 void
1421 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1422                       int segment_size, int segment_mult)
1423 {
1424         struct list_head old_lba_map_list;
1425         struct t10_alua_tg_pt_gp *tg_pt_gp;
1426         int activate = 0, supported;
1427
1428         INIT_LIST_HEAD(&old_lba_map_list);
1429         spin_lock(&dev->t10_alua.lba_map_lock);
1430         dev->t10_alua.lba_map_segment_size = segment_size;
1431         dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1432         list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1433         if (lba_map_list) {
1434                 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1435                 activate = 1;
1436         }
1437         spin_unlock(&dev->t10_alua.lba_map_lock);
1438         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1439         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1440                             tg_pt_gp_list) {
1441
1442                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1443                         continue;
1444                 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1445                 if (activate)
1446                         supported |= ALUA_LBD_SUP;
1447                 else
1448                         supported &= ~ALUA_LBD_SUP;
1449                 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1450         }
1451         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1452         core_alua_free_lba_map(&old_lba_map_list);
1453 }
1454
1455 struct t10_alua_lu_gp *
1456 core_alua_allocate_lu_gp(const char *name, int def_group)
1457 {
1458         struct t10_alua_lu_gp *lu_gp;
1459
1460         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1461         if (!lu_gp) {
1462                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1463                 return ERR_PTR(-ENOMEM);
1464         }
1465         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1466         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1467         spin_lock_init(&lu_gp->lu_gp_lock);
1468         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1469
1470         if (def_group) {
1471                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1472                 lu_gp->lu_gp_valid_id = 1;
1473                 alua_lu_gps_count++;
1474         }
1475
1476         return lu_gp;
1477 }
1478
1479 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1480 {
1481         struct t10_alua_lu_gp *lu_gp_tmp;
1482         u16 lu_gp_id_tmp;
1483         /*
1484          * The lu_gp->lu_gp_id may only be set once..
1485          */
1486         if (lu_gp->lu_gp_valid_id) {
1487                 pr_warn("ALUA LU Group already has a valid ID,"
1488                         " ignoring request\n");
1489                 return -EINVAL;
1490         }
1491
1492         spin_lock(&lu_gps_lock);
1493         if (alua_lu_gps_count == 0x0000ffff) {
1494                 pr_err("Maximum ALUA alua_lu_gps_count:"
1495                                 " 0x0000ffff reached\n");
1496                 spin_unlock(&lu_gps_lock);
1497                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1498                 return -ENOSPC;
1499         }
1500 again:
1501         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1502                                 alua_lu_gps_counter++;
1503
1504         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1505                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1506                         if (!lu_gp_id)
1507                                 goto again;
1508
1509                         pr_warn("ALUA Logical Unit Group ID: %hu"
1510                                 " already exists, ignoring request\n",
1511                                 lu_gp_id);
1512                         spin_unlock(&lu_gps_lock);
1513                         return -EINVAL;
1514                 }
1515         }
1516
1517         lu_gp->lu_gp_id = lu_gp_id_tmp;
1518         lu_gp->lu_gp_valid_id = 1;
1519         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1520         alua_lu_gps_count++;
1521         spin_unlock(&lu_gps_lock);
1522
1523         return 0;
1524 }
1525
1526 static struct t10_alua_lu_gp_member *
1527 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1528 {
1529         struct t10_alua_lu_gp_member *lu_gp_mem;
1530
1531         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1532         if (!lu_gp_mem) {
1533                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1534                 return ERR_PTR(-ENOMEM);
1535         }
1536         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1537         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1538         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1539
1540         lu_gp_mem->lu_gp_mem_dev = dev;
1541         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1542
1543         return lu_gp_mem;
1544 }
1545
1546 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1547 {
1548         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1549         /*
1550          * Once we have reached this point, config_item_put() has
1551          * already been called from target_core_alua_drop_lu_gp().
1552          *
1553          * Here, we remove the *lu_gp from the global list so that
1554          * no associations can be made while we are releasing
1555          * struct t10_alua_lu_gp.
1556          */
1557         spin_lock(&lu_gps_lock);
1558         list_del(&lu_gp->lu_gp_node);
1559         alua_lu_gps_count--;
1560         spin_unlock(&lu_gps_lock);
1561         /*
1562          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1563          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1564          * released with core_alua_put_lu_gp_from_name()
1565          */
1566         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1567                 cpu_relax();
1568         /*
1569          * Release reference to struct t10_alua_lu_gp * from all associated
1570          * struct se_device.
1571          */
1572         spin_lock(&lu_gp->lu_gp_lock);
1573         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1574                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1575                 if (lu_gp_mem->lu_gp_assoc) {
1576                         list_del(&lu_gp_mem->lu_gp_mem_list);
1577                         lu_gp->lu_gp_members--;
1578                         lu_gp_mem->lu_gp_assoc = 0;
1579                 }
1580                 spin_unlock(&lu_gp->lu_gp_lock);
1581                 /*
1582                  *
1583                  * lu_gp_mem is associated with a single
1584                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1585                  * struct se_device is released via core_alua_free_lu_gp_mem().
1586                  *
1587                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1588                  * we want to re-associate a given lu_gp_mem with default_lu_gp.
1589                  */
1590                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1591                 if (lu_gp != default_lu_gp)
1592                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1593                                         default_lu_gp);
1594                 else
1595                         lu_gp_mem->lu_gp = NULL;
1596                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1597
1598                 spin_lock(&lu_gp->lu_gp_lock);
1599         }
1600         spin_unlock(&lu_gp->lu_gp_lock);
1601
1602         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1603 }
1604
1605 void core_alua_free_lu_gp_mem(struct se_device *dev)
1606 {
1607         struct t10_alua_lu_gp *lu_gp;
1608         struct t10_alua_lu_gp_member *lu_gp_mem;
1609
1610         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1611         if (!lu_gp_mem)
1612                 return;
1613
1614         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1615                 cpu_relax();
1616
1617         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1618         lu_gp = lu_gp_mem->lu_gp;
1619         if (lu_gp) {
1620                 spin_lock(&lu_gp->lu_gp_lock);
1621                 if (lu_gp_mem->lu_gp_assoc) {
1622                         list_del(&lu_gp_mem->lu_gp_mem_list);
1623                         lu_gp->lu_gp_members--;
1624                         lu_gp_mem->lu_gp_assoc = 0;
1625                 }
1626                 spin_unlock(&lu_gp->lu_gp_lock);
1627                 lu_gp_mem->lu_gp = NULL;
1628         }
1629         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1630
1631         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1632 }
1633
1634 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1635 {
1636         struct t10_alua_lu_gp *lu_gp;
1637         struct config_item *ci;
1638
1639         spin_lock(&lu_gps_lock);
1640         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1641                 if (!lu_gp->lu_gp_valid_id)
1642                         continue;
1643                 ci = &lu_gp->lu_gp_group.cg_item;
1644                 if (!strcmp(config_item_name(ci), name)) {
1645                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1646                         spin_unlock(&lu_gps_lock);
1647                         return lu_gp;
1648                 }
1649         }
1650         spin_unlock(&lu_gps_lock);
1651
1652         return NULL;
1653 }
1654
1655 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1656 {
1657         spin_lock(&lu_gps_lock);
1658         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1659         spin_unlock(&lu_gps_lock);
1660 }
1661
1662 /*
1663  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1664  */
1665 void __core_alua_attach_lu_gp_mem(
1666         struct t10_alua_lu_gp_member *lu_gp_mem,
1667         struct t10_alua_lu_gp *lu_gp)
1668 {
1669         spin_lock(&lu_gp->lu_gp_lock);
1670         lu_gp_mem->lu_gp = lu_gp;
1671         lu_gp_mem->lu_gp_assoc = 1;
1672         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1673         lu_gp->lu_gp_members++;
1674         spin_unlock(&lu_gp->lu_gp_lock);
1675 }
1676
1677 /*
1678  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1679  */
1680 void __core_alua_drop_lu_gp_mem(
1681         struct t10_alua_lu_gp_member *lu_gp_mem,
1682         struct t10_alua_lu_gp *lu_gp)
1683 {
1684         spin_lock(&lu_gp->lu_gp_lock);
1685         list_del(&lu_gp_mem->lu_gp_mem_list);
1686         lu_gp_mem->lu_gp = NULL;
1687         lu_gp_mem->lu_gp_assoc = 0;
1688         lu_gp->lu_gp_members--;
1689         spin_unlock(&lu_gp->lu_gp_lock);
1690 }
1691
1692 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1693                 const char *name, int def_group)
1694 {
1695         struct t10_alua_tg_pt_gp *tg_pt_gp;
1696
1697         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1698         if (!tg_pt_gp) {
1699                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1700                 return NULL;
1701         }
1702         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1703         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1704         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1705         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1706         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1707         INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1708                           core_alua_do_transition_tg_pt_work);
1709         tg_pt_gp->tg_pt_gp_dev = dev;
1710         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1711                 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1712         /*
1713          * Enable both explicit and implicit ALUA support by default
1714          */
1715         tg_pt_gp->tg_pt_gp_alua_access_type =
1716                         TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1717         /*
1718          * Set the default Active/NonOptimized Delay in milliseconds
1719          */
1720         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1721         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1722         tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1723
1724         /*
1725          * Enable all supported states
1726          */
1727         tg_pt_gp->tg_pt_gp_alua_supported_states =
1728             ALUA_T_SUP | ALUA_O_SUP |
1729             ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1730
1731         if (def_group) {
1732                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1733                 tg_pt_gp->tg_pt_gp_id =
1734                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1735                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1736                 dev->t10_alua.alua_tg_pt_gps_count++;
1737                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1738                               &dev->t10_alua.tg_pt_gps_list);
1739                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1740         }
1741
1742         return tg_pt_gp;
1743 }
1744
1745 int core_alua_set_tg_pt_gp_id(
1746         struct t10_alua_tg_pt_gp *tg_pt_gp,
1747         u16 tg_pt_gp_id)
1748 {
1749         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1750         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1751         u16 tg_pt_gp_id_tmp;
1752
1753         /*
1754          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1755          */
1756         if (tg_pt_gp->tg_pt_gp_valid_id) {
1757                 pr_warn("ALUA TG PT Group already has a valid ID,"
1758                         " ignoring request\n");
1759                 return -EINVAL;
1760         }
1761
1762         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1763         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1764                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1765                         " 0x0000ffff reached\n");
1766                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1767                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1768                 return -ENOSPC;
1769         }
1770 again:
1771         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1772                         dev->t10_alua.alua_tg_pt_gps_counter++;
1773
1774         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1775                         tg_pt_gp_list) {
1776                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1777                         if (!tg_pt_gp_id)
1778                                 goto again;
1779
1780                         pr_err("ALUA Target Port Group ID: %hu already"
1781                                 " exists, ignoring request\n", tg_pt_gp_id);
1782                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1783                         return -EINVAL;
1784                 }
1785         }
1786
1787         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1788         tg_pt_gp->tg_pt_gp_valid_id = 1;
1789         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1790                         &dev->t10_alua.tg_pt_gps_list);
1791         dev->t10_alua.alua_tg_pt_gps_count++;
1792         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1793
1794         return 0;
1795 }
1796
1797 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1798         struct se_port *port)
1799 {
1800         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1801
1802         tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1803                                 GFP_KERNEL);
1804         if (!tg_pt_gp_mem) {
1805                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1806                 return ERR_PTR(-ENOMEM);
1807         }
1808         INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1809         spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1810         atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1811
1812         tg_pt_gp_mem->tg_pt = port;
1813         port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1814
1815         return tg_pt_gp_mem;
1816 }
1817
1818 void core_alua_free_tg_pt_gp(
1819         struct t10_alua_tg_pt_gp *tg_pt_gp)
1820 {
1821         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1822         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1823
1824         /*
1825          * Once we have reached this point, config_item_put() has already
1826          * been called from target_core_alua_drop_tg_pt_gp().
1827          *
1828          * Here we remove *tg_pt_gp from the global list so that
1829          * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1830          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1831          */
1832         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1833         list_del(&tg_pt_gp->tg_pt_gp_list);
1834         dev->t10_alua.alua_tg_pt_gps_counter--;
1835         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1836
1837         flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1838
1839         /*
1840          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1841          * core_alua_get_tg_pt_gp_by_name() in
1842          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1843          * to be released with core_alua_put_tg_pt_gp_from_name().
1844          */
1845         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1846                 cpu_relax();
1847
1848         /*
1849          * Release reference to struct t10_alua_tg_pt_gp from all associated
1850          * struct se_port.
1851          */
1852         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1853         list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1854                         &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1855                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1856                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1857                         tg_pt_gp->tg_pt_gp_members--;
1858                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1859                 }
1860                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1861                 /*
1862                  * tg_pt_gp_mem is associated with a single
1863                  * se_port->sep_alua_tg_pt_gp_mem, and is released via
1864                  * core_alua_free_tg_pt_gp_mem().
1865                  *
1866                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1867                  * assume we want to re-associate a given tg_pt_gp_mem with
1868                  * default_tg_pt_gp.
1869                  */
1870                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1871                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1872                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1873                                         dev->t10_alua.default_tg_pt_gp);
1874                 } else
1875                         tg_pt_gp_mem->tg_pt_gp = NULL;
1876                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1877
1878                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1879         }
1880         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1881
1882         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1883 }
1884
1885 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1886 {
1887         struct t10_alua_tg_pt_gp *tg_pt_gp;
1888         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1889
1890         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1891         if (!tg_pt_gp_mem)
1892                 return;
1893
1894         while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1895                 cpu_relax();
1896
1897         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1898         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1899         if (tg_pt_gp) {
1900                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1901                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1902                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1903                         tg_pt_gp->tg_pt_gp_members--;
1904                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1905                 }
1906                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1907                 tg_pt_gp_mem->tg_pt_gp = NULL;
1908         }
1909         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1910
1911         kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1912 }
1913
1914 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1915                 struct se_device *dev, const char *name)
1916 {
1917         struct t10_alua_tg_pt_gp *tg_pt_gp;
1918         struct config_item *ci;
1919
1920         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1921         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1922                         tg_pt_gp_list) {
1923                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1924                         continue;
1925                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1926                 if (!strcmp(config_item_name(ci), name)) {
1927                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1928                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1929                         return tg_pt_gp;
1930                 }
1931         }
1932         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1933
1934         return NULL;
1935 }
1936
1937 static void core_alua_put_tg_pt_gp_from_name(
1938         struct t10_alua_tg_pt_gp *tg_pt_gp)
1939 {
1940         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1941
1942         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1943         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1944         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1945 }
1946
1947 /*
1948  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1949  */
1950 void __core_alua_attach_tg_pt_gp_mem(
1951         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1952         struct t10_alua_tg_pt_gp *tg_pt_gp)
1953 {
1954         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1955         tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1956         tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1957         list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1958                         &tg_pt_gp->tg_pt_gp_mem_list);
1959         tg_pt_gp->tg_pt_gp_members++;
1960         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1961 }
1962
1963 /*
1964  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1965  */
1966 static void __core_alua_drop_tg_pt_gp_mem(
1967         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1968         struct t10_alua_tg_pt_gp *tg_pt_gp)
1969 {
1970         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1971         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1972         tg_pt_gp_mem->tg_pt_gp = NULL;
1973         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1974         tg_pt_gp->tg_pt_gp_members--;
1975         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1976 }
1977
1978 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1979 {
1980         struct config_item *tg_pt_ci;
1981         struct t10_alua_tg_pt_gp *tg_pt_gp;
1982         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1983         ssize_t len = 0;
1984
1985         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1986         if (!tg_pt_gp_mem)
1987                 return len;
1988
1989         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1990         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1991         if (tg_pt_gp) {
1992                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1993                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1994                         " %hu\nTG Port Primary Access State: %s\nTG Port "
1995                         "Primary Access Status: %s\nTG Port Secondary Access"
1996                         " State: %s\nTG Port Secondary Access Status: %s\n",
1997                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1998                         core_alua_dump_state(atomic_read(
1999                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
2000                         core_alua_dump_status(
2001                                 tg_pt_gp->tg_pt_gp_alua_access_status),
2002                         (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2003                         "Offline" : "None",
2004                         core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2005         }
2006         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2007
2008         return len;
2009 }
2010
2011 ssize_t core_alua_store_tg_pt_gp_info(
2012         struct se_port *port,
2013         const char *page,
2014         size_t count)
2015 {
2016         struct se_portal_group *tpg;
2017         struct se_lun *lun;
2018         struct se_device *dev = port->sep_lun->lun_se_dev;
2019         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2020         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2021         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2022         int move = 0;
2023
2024         tpg = port->sep_tpg;
2025         lun = port->sep_lun;
2026
2027         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2028         if (!tg_pt_gp_mem)
2029                 return 0;
2030
2031         if (count > TG_PT_GROUP_NAME_BUF) {
2032                 pr_err("ALUA Target Port Group alias too large!\n");
2033                 return -EINVAL;
2034         }
2035         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2036         memcpy(buf, page, count);
2037         /*
2038          * Any ALUA target port group alias besides "NULL" means we will be
2039          * making a new group association.
2040          */
2041         if (strcmp(strstrip(buf), "NULL")) {
2042                 /*
2043                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
2044                  * struct t10_alua_tg_pt_gp.  This reference is released with
2045                  * core_alua_put_tg_pt_gp_from_name() below.
2046                  */
2047                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2048                                         strstrip(buf));
2049                 if (!tg_pt_gp_new)
2050                         return -ENODEV;
2051         }
2052
2053         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2054         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2055         if (tg_pt_gp) {
2056                 /*
2057                  * Clearing an existing tg_pt_gp association, and replacing
2058                  * with the default_tg_pt_gp.
2059                  */
2060                 if (!tg_pt_gp_new) {
2061                         pr_debug("Target_Core_ConfigFS: Moving"
2062                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2063                                 " alua/%s, ID: %hu back to"
2064                                 " default_tg_pt_gp\n",
2065                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2066                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2067                                 config_item_name(&lun->lun_group.cg_item),
2068                                 config_item_name(
2069                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
2070                                 tg_pt_gp->tg_pt_gp_id);
2071
2072                         __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2073                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2074                                         dev->t10_alua.default_tg_pt_gp);
2075                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2076
2077                         return count;
2078                 }
2079                 /*
2080                  * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2081                  */
2082                 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2083                 move = 1;
2084         }
2085         /*
2086          * Associate tg_pt_gp_mem with tg_pt_gp_new.
2087          */
2088         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2089         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2090         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2091                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2092                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2093                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2094                 config_item_name(&lun->lun_group.cg_item),
2095                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2096                 tg_pt_gp_new->tg_pt_gp_id);
2097
2098         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2099         return count;
2100 }
2101
2102 ssize_t core_alua_show_access_type(
2103         struct t10_alua_tg_pt_gp *tg_pt_gp,
2104         char *page)
2105 {
2106         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2107             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2108                 return sprintf(page, "Implicit and Explicit\n");
2109         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2110                 return sprintf(page, "Implicit\n");
2111         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2112                 return sprintf(page, "Explicit\n");
2113         else
2114                 return sprintf(page, "None\n");
2115 }
2116
2117 ssize_t core_alua_store_access_type(
2118         struct t10_alua_tg_pt_gp *tg_pt_gp,
2119         const char *page,
2120         size_t count)
2121 {
2122         unsigned long tmp;
2123         int ret;
2124
2125         ret = kstrtoul(page, 0, &tmp);
2126         if (ret < 0) {
2127                 pr_err("Unable to extract alua_access_type\n");
2128                 return ret;
2129         }
2130         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2131                 pr_err("Illegal value for alua_access_type:"
2132                                 " %lu\n", tmp);
2133                 return -EINVAL;
2134         }
2135         if (tmp == 3)
2136                 tg_pt_gp->tg_pt_gp_alua_access_type =
2137                         TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2138         else if (tmp == 2)
2139                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2140         else if (tmp == 1)
2141                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2142         else
2143                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2144
2145         return count;
2146 }
2147
2148 ssize_t core_alua_show_nonop_delay_msecs(
2149         struct t10_alua_tg_pt_gp *tg_pt_gp,
2150         char *page)
2151 {
2152         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2153 }
2154
2155 ssize_t core_alua_store_nonop_delay_msecs(
2156         struct t10_alua_tg_pt_gp *tg_pt_gp,
2157         const char *page,
2158         size_t count)
2159 {
2160         unsigned long tmp;
2161         int ret;
2162
2163         ret = kstrtoul(page, 0, &tmp);
2164         if (ret < 0) {
2165                 pr_err("Unable to extract nonop_delay_msecs\n");
2166                 return ret;
2167         }
2168         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2169                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2170                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2171                         ALUA_MAX_NONOP_DELAY_MSECS);
2172                 return -EINVAL;
2173         }
2174         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2175
2176         return count;
2177 }
2178
2179 ssize_t core_alua_show_trans_delay_msecs(
2180         struct t10_alua_tg_pt_gp *tg_pt_gp,
2181         char *page)
2182 {
2183         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2184 }
2185
2186 ssize_t core_alua_store_trans_delay_msecs(
2187         struct t10_alua_tg_pt_gp *tg_pt_gp,
2188         const char *page,
2189         size_t count)
2190 {
2191         unsigned long tmp;
2192         int ret;
2193
2194         ret = kstrtoul(page, 0, &tmp);
2195         if (ret < 0) {
2196                 pr_err("Unable to extract trans_delay_msecs\n");
2197                 return ret;
2198         }
2199         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2200                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2201                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2202                         ALUA_MAX_TRANS_DELAY_MSECS);
2203                 return -EINVAL;
2204         }
2205         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2206
2207         return count;
2208 }
2209
2210 ssize_t core_alua_show_implicit_trans_secs(
2211         struct t10_alua_tg_pt_gp *tg_pt_gp,
2212         char *page)
2213 {
2214         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2215 }
2216
2217 ssize_t core_alua_store_implicit_trans_secs(
2218         struct t10_alua_tg_pt_gp *tg_pt_gp,
2219         const char *page,
2220         size_t count)
2221 {
2222         unsigned long tmp;
2223         int ret;
2224
2225         ret = kstrtoul(page, 0, &tmp);
2226         if (ret < 0) {
2227                 pr_err("Unable to extract implicit_trans_secs\n");
2228                 return ret;
2229         }
2230         if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2231                 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2232                         " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2233                         ALUA_MAX_IMPLICIT_TRANS_SECS);
2234                 return  -EINVAL;
2235         }
2236         tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2237
2238         return count;
2239 }
2240
2241 ssize_t core_alua_show_preferred_bit(
2242         struct t10_alua_tg_pt_gp *tg_pt_gp,
2243         char *page)
2244 {
2245         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2246 }
2247
2248 ssize_t core_alua_store_preferred_bit(
2249         struct t10_alua_tg_pt_gp *tg_pt_gp,
2250         const char *page,
2251         size_t count)
2252 {
2253         unsigned long tmp;
2254         int ret;
2255
2256         ret = kstrtoul(page, 0, &tmp);
2257         if (ret < 0) {
2258                 pr_err("Unable to extract preferred ALUA value\n");
2259                 return ret;
2260         }
2261         if ((tmp != 0) && (tmp != 1)) {
2262                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2263                 return -EINVAL;
2264         }
2265         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2266
2267         return count;
2268 }
2269
2270 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2271 {
2272         if (!lun->lun_sep)
2273                 return -ENODEV;
2274
2275         return sprintf(page, "%d\n",
2276                 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2277 }
2278
2279 ssize_t core_alua_store_offline_bit(
2280         struct se_lun *lun,
2281         const char *page,
2282         size_t count)
2283 {
2284         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2285         unsigned long tmp;
2286         int ret;
2287
2288         if (!lun->lun_sep)
2289                 return -ENODEV;
2290
2291         ret = kstrtoul(page, 0, &tmp);
2292         if (ret < 0) {
2293                 pr_err("Unable to extract alua_tg_pt_offline value\n");
2294                 return ret;
2295         }
2296         if ((tmp != 0) && (tmp != 1)) {
2297                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2298                                 tmp);
2299                 return -EINVAL;
2300         }
2301         tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2302         if (!tg_pt_gp_mem) {
2303                 pr_err("Unable to locate *tg_pt_gp_mem\n");
2304                 return -EINVAL;
2305         }
2306
2307         ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2308                         lun->lun_sep, 0, (int)tmp);
2309         if (ret < 0)
2310                 return -EINVAL;
2311
2312         return count;
2313 }
2314
2315 ssize_t core_alua_show_secondary_status(
2316         struct se_lun *lun,
2317         char *page)
2318 {
2319         return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2320 }
2321
2322 ssize_t core_alua_store_secondary_status(
2323         struct se_lun *lun,
2324         const char *page,
2325         size_t count)
2326 {
2327         unsigned long tmp;
2328         int ret;
2329
2330         ret = kstrtoul(page, 0, &tmp);
2331         if (ret < 0) {
2332                 pr_err("Unable to extract alua_tg_pt_status\n");
2333                 return ret;
2334         }
2335         if ((tmp != ALUA_STATUS_NONE) &&
2336             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2337             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2338                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2339                                 tmp);
2340                 return -EINVAL;
2341         }
2342         lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2343
2344         return count;
2345 }
2346
2347 ssize_t core_alua_show_secondary_write_metadata(
2348         struct se_lun *lun,
2349         char *page)
2350 {
2351         return sprintf(page, "%d\n",
2352                         lun->lun_sep->sep_tg_pt_secondary_write_md);
2353 }
2354
2355 ssize_t core_alua_store_secondary_write_metadata(
2356         struct se_lun *lun,
2357         const char *page,
2358         size_t count)
2359 {
2360         unsigned long tmp;
2361         int ret;
2362
2363         ret = kstrtoul(page, 0, &tmp);
2364         if (ret < 0) {
2365                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2366                 return ret;
2367         }
2368         if ((tmp != 0) && (tmp != 1)) {
2369                 pr_err("Illegal value for alua_tg_pt_write_md:"
2370                                 " %lu\n", tmp);
2371                 return -EINVAL;
2372         }
2373         lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2374
2375         return count;
2376 }
2377
2378 int core_setup_alua(struct se_device *dev)
2379 {
2380         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2381             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2382                 struct t10_alua_lu_gp_member *lu_gp_mem;
2383
2384                 /*
2385                  * Associate this struct se_device with the default ALUA
2386                  * LUN Group.
2387                  */
2388                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2389                 if (IS_ERR(lu_gp_mem))
2390                         return PTR_ERR(lu_gp_mem);
2391
2392                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2393                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2394                                 default_lu_gp);
2395                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2396
2397                 pr_debug("%s: Adding to default ALUA LU Group:"
2398                         " core/alua/lu_gps/default_lu_gp\n",
2399                         dev->transport->name);
2400         }
2401
2402         return 0;
2403 }