drivers/target/target_core_alua.c

   1 /*******************************************************************************
   2  * Filename:  target_core_alua.c
   3  *
   4  * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
   5  *
   6  * (c) Copyright 2009-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/slab.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/configfs.h>
  29 #include <linux/export.h>
  30 #include <linux/file.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_alua.h"
  42 #include "target_core_ua.h"
  43
  44 static sense_reason_t core_alua_check_transition(int state, int valid,
  45                                                  int *primary);
  46 static int core_alua_set_tg_pt_secondary_state(
  47                 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  48                 struct se_port *port, int explicit, int offline);
  49
  50 static char *core_alua_dump_state(int state);
  51
  52 static u16 alua_lu_gps_counter;
  53 static u32 alua_lu_gps_count;
  54
  55 static DEFINE_SPINLOCK(lu_gps_lock);
  56 static LIST_HEAD(lu_gps_list);
  57
  58 struct t10_alua_lu_gp *default_lu_gp;
  59
  60 /*
  61  * REPORT REFERRALS
  62  *
  63  * See sbc3r35 section 5.23
  64  */
  65 sense_reason_t
  66 target_emulate_report_referrals(struct se_cmd *cmd)
  67 {
  68         struct se_device *dev = cmd->se_dev;
  69         struct t10_alua_lba_map *map;
  70         struct t10_alua_lba_map_member *map_mem;
  71         unsigned char *buf;
  72         u32 rd_len = 0, off;
  73
  74         if (cmd->data_length < 4) {
  75                 pr_warn("REPORT REFERRALS allocation length %u too"
  76                         " small\n", cmd->data_length);
  77                 return TCM_INVALID_CDB_FIELD;
  78         }
  79
  80         buf = transport_kmap_data_sg(cmd);
  81         if (!buf)
  82                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  83
  84         off = 4;
  85         spin_lock(&dev->t10_alua.lba_map_lock);
  86         if (list_empty(&dev->t10_alua.lba_map_list)) {
  87                 spin_unlock(&dev->t10_alua.lba_map_lock);
  88                 transport_kunmap_data_sg(cmd);
  89
  90                 return TCM_UNSUPPORTED_SCSI_OPCODE;
  91         }
  92
  93         list_for_each_entry(map, &dev->t10_alua.lba_map_list,
  94                             lba_map_list) {
  95                 int desc_num = off + 3;
  96                 int pg_num;
  97
  98                 off += 4;
  99                 if (cmd->data_length > off)
 100                         put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
 101                 off += 8;
 102                 if (cmd->data_length > off)
 103                         put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
 104                 off += 8;
 105                 rd_len += 20;
 106                 pg_num = 0;
 107                 list_for_each_entry(map_mem, &map->lba_map_mem_list,
 108                                     lba_map_mem_list) {
 109                         int alua_state = map_mem->lba_map_mem_alua_state;
 110                         int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
 111
 112                         if (cmd->data_length > off)
 113                                 buf[off] = alua_state & 0x0f;
 114                         off += 2;
 115                         if (cmd->data_length > off)
 116                                 buf[off] = (alua_pg_id >> 8) & 0xff;
 117                         off++;
 118                         if (cmd->data_length > off)
 119                                 buf[off] = (alua_pg_id & 0xff);
 120                         off++;
 121                         rd_len += 4;
 122                         pg_num++;
 123                 }
 124                 if (cmd->data_length > desc_num)
 125                         buf[desc_num] = pg_num;
 126         }
 127         spin_unlock(&dev->t10_alua.lba_map_lock);
 128
 129         /*
 130          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 131          */
 132         put_unaligned_be16(rd_len, &buf[2]);
 133
 134         transport_kunmap_data_sg(cmd);
 135
 136         target_complete_cmd(cmd, GOOD);
 137         return 0;
 138 }
 139
 140 /*
 141  * REPORT_TARGET_PORT_GROUPS
 142  *
 143  * See spc4r17 section 6.27
 144  */
 145 sense_reason_t
 146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
 147 {
 148         struct se_device *dev = cmd->se_dev;
 149         struct se_port *port;
 150         struct t10_alua_tg_pt_gp *tg_pt_gp;
 151         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 152         unsigned char *buf;
 153         u32 rd_len = 0, off;
 154         int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
 155
 156         /*
 157          * Skip over RESERVED area to first Target port group descriptor
 158          * depending on the PARAMETER DATA FORMAT type..
 159          */
 160         if (ext_hdr != 0)
 161                 off = 8;
 162         else
 163                 off = 4;
 164
 165         if (cmd->data_length < off) {
 166                 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
 167                         " small for %s header\n", cmd->data_length,
 168                         (ext_hdr) ? "extended" : "normal");
 169                 return TCM_INVALID_CDB_FIELD;
 170         }
 171         buf = transport_kmap_data_sg(cmd);
 172         if (!buf)
 173                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 174
 175         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 176         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
 177                         tg_pt_gp_list) {
 178                 /*
 179                  * Check if the Target port group and Target port descriptor list
 180                  * based on tg_pt_gp_members count will fit into the response payload.
 181                  * Otherwise, bump rd_len to let the initiator know we have exceeded
 182                  * the allocation length and the response is truncated.
 183                  */
 184                 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
 185                      cmd->data_length) {
 186                         rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
 187                         continue;
 188                 }
 189                 /*
 190                  * PREF: Preferred target port bit, determine if this
 191                  * bit should be set for port group.
 192                  */
 193                 if (tg_pt_gp->tg_pt_gp_pref)
 194                         buf[off] = 0x80;
 195                 /*
 196                  * Set the ASYMMETRIC ACCESS State
 197                  */
 198                 buf[off++] |= (atomic_read(
 199                         &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
 200                 /*
 201                  * Set supported ASYMMETRIC ACCESS State bits
 202                  */
 203                 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
 204                 /*
 205                  * TARGET PORT GROUP
 206                  */
 207                 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
 208                 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
 209
 210                 off++; /* Skip over Reserved */
 211                 /*
 212                  * STATUS CODE
 213                  */
 214                 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
 215                 /*
 216                  * Vendor Specific field
 217                  */
 218                 buf[off++] = 0x00;
 219                 /*
 220                  * TARGET PORT COUNT
 221                  */
 222                 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
 223                 rd_len += 8;
 224
 225                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 226                 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
 227                                 tg_pt_gp_mem_list) {
 228                         port = tg_pt_gp_mem->tg_pt;
 229                         /*
 230                          * Start Target Port descriptor format
 231                          *
 232                          * See spc4r17 section 6.2.7 Table 247
 233                          */
 234                         off += 2; /* Skip over Obsolete */
 235                         /*
 236                          * Set RELATIVE TARGET PORT IDENTIFIER
 237                          */
 238                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 239                         buf[off++] = (port->sep_rtpi & 0xff);
 240                         rd_len += 4;
 241                 }
 242                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 243         }
 244         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 245         /*
 246          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 247          */
 248         put_unaligned_be32(rd_len, &buf[0]);
 249
 250         /*
 251          * Fill in the Extended header parameter data format if requested
 252          */
 253         if (ext_hdr != 0) {
 254                 buf[4] = 0x10;
 255                 /*
 256                  * Set the implicit transition time (in seconds) for the application
 257                  * client to use as a base for it's transition timeout value.
 258                  *
 259                  * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
 260                  * this CDB was received upon to determine this value individually
 261                  * for ALUA target port group.
 262                  */
 263                 port = cmd->se_lun->lun_sep;
 264                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 265                 if (tg_pt_gp_mem) {
 266                         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 267                         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 268                         if (tg_pt_gp)
 269                                 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
 270                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 271                 }
 272         }
 273         transport_kunmap_data_sg(cmd);
 274
 275         target_complete_cmd(cmd, GOOD);
 276         return 0;
 277 }
 278
 279 /*
 280  * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
 281  *
 282  * See spc4r17 section 6.35
 283  */
 284 sense_reason_t
 285 target_emulate_set_target_port_groups(struct se_cmd *cmd)
 286 {
 287         struct se_device *dev = cmd->se_dev;
 288         struct se_port *port, *l_port = cmd->se_lun->lun_sep;
 289         struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
 290         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
 291         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
 292         unsigned char *buf;
 293         unsigned char *ptr;
 294         sense_reason_t rc = TCM_NO_SENSE;
 295         u32 len = 4; /* Skip over RESERVED area in header */
 296         int alua_access_state, primary = 0, valid_states;
 297         u16 tg_pt_id, rtpi;
 298
 299         if (!l_port)
 300                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 301
 302         if (cmd->data_length < 4) {
 303                 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
 304                         " small\n", cmd->data_length);
 305                 return TCM_INVALID_PARAMETER_LIST;
 306         }
 307
 308         buf = transport_kmap_data_sg(cmd);
 309         if (!buf)
 310                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 311
 312         /*
 313          * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
 314          * for the local tg_pt_gp.
 315          */
 316         l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
 317         if (!l_tg_pt_gp_mem) {
 318                 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
 319                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 320                 goto out;
 321         }
 322         spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 323         l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
 324         if (!l_tg_pt_gp) {
 325                 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 326                 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
 327                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 328                 goto out;
 329         }
 330         spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 331
 332         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
 333                 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
 334                                 " while TPGS_EXPLICIT_ALUA is disabled\n");
 335                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 336                 goto out;
 337         }
 338         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
 339
 340         ptr = &buf[4]; /* Skip over RESERVED area in header */
 341
 342         while (len < cmd->data_length) {
 343                 bool found = false;
 344                 alua_access_state = (ptr[0] & 0x0f);
 345                 /*
 346                  * Check the received ALUA access state, and determine if
 347                  * the state is a primary or secondary target port asymmetric
 348                  * access state.
 349                  */
 350                 rc = core_alua_check_transition(alua_access_state,
 351                                                 valid_states, &primary);
 352                 if (rc) {
 353                         /*
 354                          * If the SET TARGET PORT GROUPS attempts to establish
 355                          * an invalid combination of target port asymmetric
 356                          * access states or attempts to establish an
 357                          * unsupported target port asymmetric access state,
 358                          * then the command shall be terminated with CHECK
 359                          * CONDITION status, with the sense key set to ILLEGAL
 360                          * REQUEST, and the additional sense code set to INVALID
 361                          * FIELD IN PARAMETER LIST.
 362                          */
 363                         goto out;
 364                 }
 365
 366                 /*
 367                  * If the ASYMMETRIC ACCESS STATE field (see table 267)
 368                  * specifies a primary target port asymmetric access state,
 369                  * then the TARGET PORT GROUP OR TARGET PORT field specifies
 370                  * a primary target port group for which the primary target
 371                  * port asymmetric access state shall be changed. If the
 372                  * ASYMMETRIC ACCESS STATE field specifies a secondary target
 373                  * port asymmetric access state, then the TARGET PORT GROUP OR
 374                  * TARGET PORT field specifies the relative target port
 375                  * identifier (see 3.1.120) of the target port for which the
 376                  * secondary target port asymmetric access state shall be
 377                  * changed.
 378                  */
 379                 if (primary) {
 380                         tg_pt_id = get_unaligned_be16(ptr + 2);
 381                         /*
 382                          * Locate the matching target port group ID from
 383                          * the global tg_pt_gp list
 384                          */
 385                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 386                         list_for_each_entry(tg_pt_gp,
 387                                         &dev->t10_alua.tg_pt_gps_list,
 388                                         tg_pt_gp_list) {
 389                                 if (!tg_pt_gp->tg_pt_gp_valid_id)
 390                                         continue;
 391
 392                                 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
 393                                         continue;
 394
 395                                 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
 396                                 smp_mb__after_atomic();
 397
 398                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 399
 400                                 if (!core_alua_do_port_transition(tg_pt_gp,
 401                                                 dev, l_port, nacl,
 402                                                 alua_access_state, 1))
 403                                         found = true;
 404
 405                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 406                                 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
 407                                 smp_mb__after_atomic();
 408                                 break;
 409                         }
 410                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 411                 } else {
 412                         /*
 413                          * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
 414                          * the Target Port in question for the the incoming
 415                          * SET_TARGET_PORT_GROUPS op.
 416                          */
 417                         rtpi = get_unaligned_be16(ptr + 2);
 418                         /*
 419                          * Locate the matching relative target port identifier
 420                          * for the struct se_device storage object.
 421                          */
 422                         spin_lock(&dev->se_port_lock);
 423                         list_for_each_entry(port, &dev->dev_sep_list,
 424                                                         sep_list) {
 425                                 if (port->sep_rtpi != rtpi)
 426                                         continue;
 427
 428                                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 429
 430                                 spin_unlock(&dev->se_port_lock);
 431
 432                                 if (!core_alua_set_tg_pt_secondary_state(
 433                                                 tg_pt_gp_mem, port, 1, 1))
 434                                         found = true;
 435
 436                                 spin_lock(&dev->se_port_lock);
 437                                 break;
 438                         }
 439                         spin_unlock(&dev->se_port_lock);
 440                 }
 441
 442                 if (!found) {
 443                         rc = TCM_INVALID_PARAMETER_LIST;
 444                         goto out;
 445                 }
 446
 447                 ptr += 4;
 448                 len += 4;
 449         }
 450
 451 out:
 452         transport_kunmap_data_sg(cmd);
 453         if (!rc)
 454                 target_complete_cmd(cmd, GOOD);
 455         return rc;
 456 }
 457
 458 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
 459 {
 460         /*
 461          * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 462          * The ALUA additional sense code qualifier (ASCQ) is determined
 463          * by the ALUA primary or secondary access state..
 464          */
 465         pr_debug("[%s]: ALUA TG Port not available, "
 466                 "SenseKey: NOT_READY, ASC/ASCQ: "
 467                 "0x04/0x%02x\n",
 468                 cmd->se_tfo->get_fabric_name(), alua_ascq);
 469
 470         cmd->scsi_asc = 0x04;
 471         cmd->scsi_ascq = alua_ascq;
 472 }
 473
 474 static inline void core_alua_state_nonoptimized(
 475         struct se_cmd *cmd,
 476         unsigned char *cdb,
 477         int nonop_delay_msecs)
 478 {
 479         /*
 480          * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
 481          * later to determine if processing of this cmd needs to be
 482          * temporarily delayed for the Active/NonOptimized primary access state.
 483          */
 484         cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
 485         cmd->alua_nonop_delay = nonop_delay_msecs;
 486 }
 487
 488 static inline int core_alua_state_lba_dependent(
 489         struct se_cmd *cmd,
 490         struct t10_alua_tg_pt_gp *tg_pt_gp)
 491 {
 492         struct se_device *dev = cmd->se_dev;
 493         u64 segment_size, segment_mult, sectors, lba;
 494
 495         /* Only need to check for cdb actually containing LBAs */
 496         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
 497                 return 0;
 498
 499         spin_lock(&dev->t10_alua.lba_map_lock);
 500         segment_size = dev->t10_alua.lba_map_segment_size;
 501         segment_mult = dev->t10_alua.lba_map_segment_multiplier;
 502         sectors = cmd->data_length / dev->dev_attrib.block_size;
 503
 504         lba = cmd->t_task_lba;
 505         while (lba < cmd->t_task_lba + sectors) {
 506                 struct t10_alua_lba_map *cur_map = NULL, *map;
 507                 struct t10_alua_lba_map_member *map_mem;
 508
 509                 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
 510                                     lba_map_list) {
 511                         u64 start_lba, last_lba;
 512                         u64 first_lba = map->lba_map_first_lba;
 513
 514                         if (segment_mult) {
 515                                 u64 tmp = lba;
 516                                 start_lba = do_div(tmp, segment_size * segment_mult);
 517
 518                                 last_lba = first_lba + segment_size - 1;
 519                                 if (start_lba >= first_lba &&
 520                                     start_lba <= last_lba) {
 521                                         lba += segment_size;
 522                                         cur_map = map;
 523                                         break;
 524                                 }
 525                         } else {
 526                                 last_lba = map->lba_map_last_lba;
 527                                 if (lba >= first_lba && lba <= last_lba) {
 528                                         lba = last_lba + 1;
 529                                         cur_map = map;
 530                                         break;
 531                                 }
 532                         }
 533                 }
 534                 if (!cur_map) {
 535                         spin_unlock(&dev->t10_alua.lba_map_lock);
 536                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 537                         return 1;
 538                 }
 539                 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
 540                                     lba_map_mem_list) {
 541                         if (map_mem->lba_map_mem_alua_pg_id !=
 542                             tg_pt_gp->tg_pt_gp_id)
 543                                 continue;
 544                         switch(map_mem->lba_map_mem_alua_state) {
 545                         case ALUA_ACCESS_STATE_STANDBY:
 546                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 547                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 548                                 return 1;
 549                         case ALUA_ACCESS_STATE_UNAVAILABLE:
 550                                 spin_unlock(&dev->t10_alua.lba_map_lock);
 551                                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 552                                 return 1;
 553                         default:
 554                                 break;
 555                         }
 556                 }
 557         }
 558         spin_unlock(&dev->t10_alua.lba_map_lock);
 559         return 0;
 560 }
 561
 562 static inline int core_alua_state_standby(
 563         struct se_cmd *cmd,
 564         unsigned char *cdb)
 565 {
 566         /*
 567          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 568          * spc4r17 section 5.9.2.4.4
 569          */
 570         switch (cdb[0]) {
 571         case INQUIRY:
 572         case LOG_SELECT:
 573         case LOG_SENSE:
 574         case MODE_SELECT:
 575         case MODE_SENSE:
 576         case REPORT_LUNS:
 577         case RECEIVE_DIAGNOSTIC:
 578         case SEND_DIAGNOSTIC:
 579         case READ_CAPACITY:
 580                 return 0;
 581         case SERVICE_ACTION_IN:
 582                 switch (cdb[1] & 0x1f) {
 583                 case SAI_READ_CAPACITY_16:
 584                         return 0;
 585                 default:
 586                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 587                         return 1;
 588                 }
 589         case MAINTENANCE_IN:
 590                 switch (cdb[1] & 0x1f) {
 591                 case MI_REPORT_TARGET_PGS:
 592                         return 0;
 593                 default:
 594                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 595                         return 1;
 596                 }
 597         case MAINTENANCE_OUT:
 598                 switch (cdb[1]) {
 599                 case MO_SET_TARGET_PGS:
 600                         return 0;
 601                 default:
 602                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 603                         return 1;
 604                 }
 605         case REQUEST_SENSE:
 606         case PERSISTENT_RESERVE_IN:
 607         case PERSISTENT_RESERVE_OUT:
 608         case READ_BUFFER:
 609         case WRITE_BUFFER:
 610                 return 0;
 611         default:
 612                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
 613                 return 1;
 614         }
 615
 616         return 0;
 617 }
 618
 619 static inline int core_alua_state_unavailable(
 620         struct se_cmd *cmd,
 621         unsigned char *cdb)
 622 {
 623         /*
 624          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 625          * spc4r17 section 5.9.2.4.5
 626          */
 627         switch (cdb[0]) {
 628         case INQUIRY:
 629         case REPORT_LUNS:
 630                 return 0;
 631         case MAINTENANCE_IN:
 632                 switch (cdb[1] & 0x1f) {
 633                 case MI_REPORT_TARGET_PGS:
 634                         return 0;
 635                 default:
 636                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 637                         return 1;
 638                 }
 639         case MAINTENANCE_OUT:
 640                 switch (cdb[1]) {
 641                 case MO_SET_TARGET_PGS:
 642                         return 0;
 643                 default:
 644                         set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 645                         return 1;
 646                 }
 647         case REQUEST_SENSE:
 648         case READ_BUFFER:
 649         case WRITE_BUFFER:
 650                 return 0;
 651         default:
 652                 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
 653                 return 1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static inline int core_alua_state_transition(
 660         struct se_cmd *cmd,
 661         unsigned char *cdb)
 662 {
 663         /*
 664          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
 665          * spc4r17 section 5.9.2.5
 666          */
 667         switch (cdb[0]) {
 668         case INQUIRY:
 669         case REPORT_LUNS:
 670                 return 0;
 671         case MAINTENANCE_IN:
 672                 switch (cdb[1] & 0x1f) {
 673                 case MI_REPORT_TARGET_PGS:
 674                         return 0;
 675                 default:
 676                         set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 677                         return 1;
 678                 }
 679         case REQUEST_SENSE:
 680         case READ_BUFFER:
 681         case WRITE_BUFFER:
 682                 return 0;
 683         default:
 684                 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
 685                 return 1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 /*
 692  * return 1: Is used to signal LUN not accessible, and check condition/not ready
 693  * return 0: Used to signal success
 694  * return -1: Used to signal failure, and invalid cdb field
 695  */
 696 sense_reason_t
 697 target_alua_state_check(struct se_cmd *cmd)
 698 {
 699         struct se_device *dev = cmd->se_dev;
 700         unsigned char *cdb = cmd->t_task_cdb;
 701         struct se_lun *lun = cmd->se_lun;
 702         struct se_port *port = lun->lun_sep;
 703         struct t10_alua_tg_pt_gp *tg_pt_gp;
 704         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 705         int out_alua_state, nonop_delay_msecs;
 706
 707         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 708                 return 0;
 709         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
 710                 return 0;
 711
 712         if (!port)
 713                 return 0;
 714         /*
 715          * First, check for a struct se_port specific secondary ALUA target port
 716          * access state: OFFLINE
 717          */
 718         if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
 719                 pr_debug("ALUA: Got secondary offline status for local"
 720                                 " target port\n");
 721                 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
 722                 return TCM_CHECK_CONDITION_NOT_READY;
 723         }
 724          /*
 725          * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
 726          * ALUA target port group, to obtain current ALUA access state.
 727          * Otherwise look for the underlying struct se_device association with
 728          * a ALUA logical unit group.
 729          */
 730         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 731         if (!tg_pt_gp_mem)
 732                 return 0;
 733
 734         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 735         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 736         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 737         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 738         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 739         /*
 740          * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
 741          * statement so the compiler knows explicitly to check this case first.
 742          * For the Optimized ALUA access state case, we want to process the
 743          * incoming fabric cmd ASAP..
 744          */
 745         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
 746                 return 0;
 747
 748         switch (out_alua_state) {
 749         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 750                 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
 751                 break;
 752         case ALUA_ACCESS_STATE_STANDBY:
 753                 if (core_alua_state_standby(cmd, cdb))
 754                         return TCM_CHECK_CONDITION_NOT_READY;
 755                 break;
 756         case ALUA_ACCESS_STATE_UNAVAILABLE:
 757                 if (core_alua_state_unavailable(cmd, cdb))
 758                         return TCM_CHECK_CONDITION_NOT_READY;
 759                 break;
 760         case ALUA_ACCESS_STATE_TRANSITION:
 761                 if (core_alua_state_transition(cmd, cdb))
 762                         return TCM_CHECK_CONDITION_NOT_READY;
 763                 break;
 764         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 765                 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
 766                         return TCM_CHECK_CONDITION_NOT_READY;
 767                 break;
 768         /*
 769          * OFFLINE is a secondary ALUA target port group access state, that is
 770          * handled above with struct se_port->sep_tg_pt_secondary_offline=1
 771          */
 772         case ALUA_ACCESS_STATE_OFFLINE:
 773         default:
 774                 pr_err("Unknown ALUA access state: 0x%02x\n",
 775                                 out_alua_state);
 776                 return TCM_INVALID_CDB_FIELD;
 777         }
 778
 779         return 0;
 780 }
 781
 782 /*
 783  * Check implicit and explicit ALUA state change request.
 784  */
 785 static sense_reason_t
 786 core_alua_check_transition(int state, int valid, int *primary)
 787 {
 788         /*
 789          * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 790          * defined as primary target port asymmetric access states.
 791          */
 792         switch (state) {
 793         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 794                 if (!(valid & ALUA_AO_SUP))
 795                         goto not_supported;
 796                 *primary = 1;
 797                 break;
 798         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 799                 if (!(valid & ALUA_AN_SUP))
 800                         goto not_supported;
 801                 *primary = 1;
 802                 break;
 803         case ALUA_ACCESS_STATE_STANDBY:
 804                 if (!(valid & ALUA_S_SUP))
 805                         goto not_supported;
 806                 *primary = 1;
 807                 break;
 808         case ALUA_ACCESS_STATE_UNAVAILABLE:
 809                 if (!(valid & ALUA_U_SUP))
 810                         goto not_supported;
 811                 *primary = 1;
 812                 break;
 813         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 814                 if (!(valid & ALUA_LBD_SUP))
 815                         goto not_supported;
 816                 *primary = 1;
 817                 break;
 818         case ALUA_ACCESS_STATE_OFFLINE:
 819                 /*
 820                  * OFFLINE state is defined as a secondary target port
 821                  * asymmetric access state.
 822                  */
 823                 if (!(valid & ALUA_O_SUP))
 824                         goto not_supported;
 825                 *primary = 0;
 826                 break;
 827         case ALUA_ACCESS_STATE_TRANSITION:
 828                 /*
 829                  * Transitioning is set internally, and
 830                  * cannot be selected manually.
 831                  */
 832                 goto not_supported;
 833         default:
 834                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 835                 return TCM_INVALID_PARAMETER_LIST;
 836         }
 837
 838         return 0;
 839
 840 not_supported:
 841         pr_err("ALUA access state %s not supported",
 842                core_alua_dump_state(state));
 843         return TCM_INVALID_PARAMETER_LIST;
 844 }
 845
 846 static char *core_alua_dump_state(int state)
 847 {
 848         switch (state) {
 849         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
 850                 return "Active/Optimized";
 851         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 852                 return "Active/NonOptimized";
 853         case ALUA_ACCESS_STATE_LBA_DEPENDENT:
 854                 return "LBA Dependent";
 855         case ALUA_ACCESS_STATE_STANDBY:
 856                 return "Standby";
 857         case ALUA_ACCESS_STATE_UNAVAILABLE:
 858                 return "Unavailable";
 859         case ALUA_ACCESS_STATE_OFFLINE:
 860                 return "Offline";
 861         case ALUA_ACCESS_STATE_TRANSITION:
 862                 return "Transitioning";
 863         default:
 864                 return "Unknown";
 865         }
 866
 867         return NULL;
 868 }
 869
 870 char *core_alua_dump_status(int status)
 871 {
 872         switch (status) {
 873         case ALUA_STATUS_NONE:
 874                 return "None";
 875         case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
 876                 return "Altered by Explicit STPG";
 877         case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
 878                 return "Altered by Implicit ALUA";
 879         default:
 880                 return "Unknown";
 881         }
 882
 883         return NULL;
 884 }
 885
 886 /*
 887  * Used by fabric modules to determine when we need to delay processing
 888  * for the Active/NonOptimized paths..
 889  */
 890 int core_alua_check_nonop_delay(
 891         struct se_cmd *cmd)
 892 {
 893         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 894                 return 0;
 895         if (in_interrupt())
 896                 return 0;
 897         /*
 898          * The ALUA Active/NonOptimized access state delay can be disabled
 899          * in via configfs with a value of zero
 900          */
 901         if (!cmd->alua_nonop_delay)
 902                 return 0;
 903         /*
 904          * struct se_cmd->alua_nonop_delay gets set by a target port group
 905          * defined interval in core_alua_state_nonoptimized()
 906          */
 907         msleep_interruptible(cmd->alua_nonop_delay);
 908         return 0;
 909 }
 910 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 911
 912 /*
 913  * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
 914  *
 915  */
 916 static int core_alua_write_tpg_metadata(
 917         const char *path,
 918         unsigned char *md_buf,
 919         u32 md_buf_len)
 920 {
 921         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 922         int ret;
 923
 924         if (IS_ERR(file)) {
 925                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 926                 return -ENODEV;
 927         }
 928         ret = kernel_write(file, md_buf, md_buf_len, 0);
 929         if (ret < 0)
 930                 pr_err("Error writing ALUA metadata file: %s\n", path);
 931         fput(file);
 932         return (ret < 0) ? -EIO : 0;
 933 }
 934
 935 /*
 936  * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 937  */
 938 static int core_alua_update_tpg_primary_metadata(
 939         struct t10_alua_tg_pt_gp *tg_pt_gp)
 940 {
 941         unsigned char *md_buf;
 942         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 943         char path[ALUA_METADATA_PATH_LEN];
 944         int len, rc;
 945
 946         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
 947         if (!md_buf) {
 948                 pr_err("Unable to allocate buf for ALUA metadata\n");
 949                 return -ENOMEM;
 950         }
 951
 952         memset(path, 0, ALUA_METADATA_PATH_LEN);
 953
 954         len = snprintf(md_buf, ALUA_MD_BUF_LEN,
 955                         "tg_pt_gp_id=%hu\n"
 956                         "alua_access_state=0x%02x\n"
 957                         "alua_access_status=0x%02x\n",
 958                         tg_pt_gp->tg_pt_gp_id,
 959                         tg_pt_gp->tg_pt_gp_alua_pending_state,
 960                         tg_pt_gp->tg_pt_gp_alua_access_status);
 961
 962         snprintf(path, ALUA_METADATA_PATH_LEN,
 963                 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
 964                 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 965
 966         rc = core_alua_write_tpg_metadata(path, md_buf, len);
 967         kfree(md_buf);
 968         return rc;
 969 }
 970
 971 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
 972 {
 973         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
 974                 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
 975         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
 976         struct se_dev_entry *se_deve;
 977         struct se_lun_acl *lacl;
 978         struct se_port *port;
 979         struct t10_alua_tg_pt_gp_member *mem;
 980         bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
 981                          ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
 982
 983         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 984         list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
 985                                 tg_pt_gp_mem_list) {
 986                 port = mem->tg_pt;
 987                 /*
 988                  * After an implicit target port asymmetric access state
 989                  * change, a device server shall establish a unit attention
 990                  * condition for the initiator port associated with every I_T
 991                  * nexus with the additional sense code set to ASYMMETRIC
 992                  * ACCESS STATE CHANGED.
 993                  *
 994                  * After an explicit target port asymmetric access state
 995                  * change, a device server shall establish a unit attention
 996                  * condition with the additional sense code set to ASYMMETRIC
 997                  * ACCESS STATE CHANGED for the initiator port associated with
 998                  * every I_T nexus other than the I_T nexus on which the SET
 999                  * TARGET PORT GROUPS command
1000                  */
1001                 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
1002                 smp_mb__after_atomic();
1003                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1004
1005                 spin_lock_bh(&port->sep_alua_lock);
1006                 list_for_each_entry(se_deve, &port->sep_alua_list,
1007                                         alua_port_list) {
1008                         lacl = se_deve->se_lun_acl;
1009                         /*
1010                          * se_deve->se_lun_acl pointer may be NULL for a
1011                          * entry created without explicit Node+MappedLUN ACLs
1012                          */
1013                         if (!lacl)
1014                                 continue;
1015
1016                         if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1017                              ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1018                            (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1019                             (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1020                            (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1021                             (tg_pt_gp->tg_pt_gp_alua_port == port))
1022                                 continue;
1023
1024                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
1025                                 se_deve->mapped_lun, 0x2A,
1026                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1027                 }
1028                 spin_unlock_bh(&port->sep_alua_lock);
1029
1030                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1031                 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
1032                 smp_mb__after_atomic();
1033         }
1034         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1035         /*
1036          * Update the ALUA metadata buf that has been allocated in
1037          * core_alua_do_port_transition(), this metadata will be written
1038          * to struct file.
1039          *
1040          * Note that there is the case where we do not want to update the
1041          * metadata when the saved metadata is being parsed in userspace
1042          * when setting the existing port access state and access status.
1043          *
1044          * Also note that the failure to write out the ALUA metadata to
1045          * struct file does NOT affect the actual ALUA transition.
1046          */
1047         if (tg_pt_gp->tg_pt_gp_write_metadata) {
1048                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1049                 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1050                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1051         }
1052         /*
1053          * Set the current primary ALUA access state to the requested new state
1054          */
1055         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1056                    tg_pt_gp->tg_pt_gp_alua_pending_state);
1057
1058         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1059                 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1060                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1061                 tg_pt_gp->tg_pt_gp_id,
1062                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1063                 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1064         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1065         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1066         smp_mb__after_atomic();
1067         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1068
1069         if (tg_pt_gp->tg_pt_gp_transition_complete)
1070                 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1071 }
1072
1073 static int core_alua_do_transition_tg_pt(
1074         struct t10_alua_tg_pt_gp *tg_pt_gp,
1075         int new_state,
1076         int explicit)
1077 {
1078         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1079         DECLARE_COMPLETION_ONSTACK(wait);
1080
1081         /* Nothing to be done here */
1082         if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1083                 return 0;
1084
1085         if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1086                 return -EAGAIN;
1087
1088         /*
1089          * Flush any pending transitions
1090          */
1091         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1092             atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1093             ALUA_ACCESS_STATE_TRANSITION) {
1094                 /* Just in case */
1095                 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1096                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1097                 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1098                 wait_for_completion(&wait);
1099                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1100                 return 0;
1101         }
1102
1103         /*
1104          * Save the old primary ALUA access state, and set the current state
1105          * to ALUA_ACCESS_STATE_TRANSITION.
1106          */
1107         tg_pt_gp->tg_pt_gp_alua_previous_state =
1108                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1109         tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1110
1111         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1112                         ALUA_ACCESS_STATE_TRANSITION);
1113         tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1114                                 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1115                                 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1116
1117         /*
1118          * Check for the optional ALUA primary state transition delay
1119          */
1120         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1121                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1122
1123         /*
1124          * Take a reference for workqueue item
1125          */
1126         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1127         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1128         smp_mb__after_atomic();
1129         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1130
1131         if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1132                 unsigned long transition_tmo;
1133
1134                 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1135                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1136                                    &tg_pt_gp->tg_pt_gp_transition_work,
1137                                    transition_tmo);
1138         } else {
1139                 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1140                 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1141                                    &tg_pt_gp->tg_pt_gp_transition_work, 0);
1142                 wait_for_completion(&wait);
1143                 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1144         }
1145
1146         return 0;
1147 }
1148
1149 int core_alua_do_port_transition(
1150         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1151         struct se_device *l_dev,
1152         struct se_port *l_port,
1153         struct se_node_acl *l_nacl,
1154         int new_state,
1155         int explicit)
1156 {
1157         struct se_device *dev;
1158         struct t10_alua_lu_gp *lu_gp;
1159         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1160         struct t10_alua_tg_pt_gp *tg_pt_gp;
1161         int primary, valid_states, rc = 0;
1162
1163         valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1164         if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1165                 return -EINVAL;
1166
1167         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1168         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1169         lu_gp = local_lu_gp_mem->lu_gp;
1170         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1171         smp_mb__after_atomic();
1172         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1173         /*
1174          * For storage objects that are members of the 'default_lu_gp',
1175          * we only do transition on the passed *l_tp_pt_gp, and not
1176          * on all of the matching target port groups IDs in default_lu_gp.
1177          */
1178         if (!lu_gp->lu_gp_id) {
1179                 /*
1180                  * core_alua_do_transition_tg_pt() will always return
1181                  * success.
1182                  */
1183                 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1184                 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1185                 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1186                                                    new_state, explicit);
1187                 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1188                 smp_mb__after_atomic();
1189                 return rc;
1190         }
1191         /*
1192          * For all other LU groups aside from 'default_lu_gp', walk all of
1193          * the associated storage objects looking for a matching target port
1194          * group ID from the local target port group.
1195          */
1196         spin_lock(&lu_gp->lu_gp_lock);
1197         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1198                                 lu_gp_mem_list) {
1199
1200                 dev = lu_gp_mem->lu_gp_mem_dev;
1201                 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
1202                 smp_mb__after_atomic();
1203                 spin_unlock(&lu_gp->lu_gp_lock);
1204
1205                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1206                 list_for_each_entry(tg_pt_gp,
1207                                 &dev->t10_alua.tg_pt_gps_list,
1208                                 tg_pt_gp_list) {
1209
1210                         if (!tg_pt_gp->tg_pt_gp_valid_id)
1211                                 continue;
1212                         /*
1213                          * If the target behavior port asymmetric access state
1214                          * is changed for any target port group accessible via
1215                          * a logical unit within a LU group, the target port
1216                          * behavior group asymmetric access states for the same
1217                          * target port group accessible via other logical units
1218                          * in that LU group will also change.
1219                          */
1220                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1221                                 continue;
1222
1223                         if (l_tg_pt_gp == tg_pt_gp) {
1224                                 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1225                                 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1226                         } else {
1227                                 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1228                                 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1229                         }
1230                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1231                         smp_mb__after_atomic();
1232                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1233                         /*
1234                          * core_alua_do_transition_tg_pt() will always return
1235                          * success.
1236                          */
1237                         rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1238                                         new_state, explicit);
1239
1240                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1241                         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1242                         smp_mb__after_atomic();
1243                         if (rc)
1244                                 break;
1245                 }
1246                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1247
1248                 spin_lock(&lu_gp->lu_gp_lock);
1249                 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
1250                 smp_mb__after_atomic();
1251         }
1252         spin_unlock(&lu_gp->lu_gp_lock);
1253
1254         if (!rc) {
1255                 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1256                          " Group IDs: %hu %s transition to primary state: %s\n",
1257                          config_item_name(&lu_gp->lu_gp_group.cg_item),
1258                          l_tg_pt_gp->tg_pt_gp_id,
1259                          (explicit) ? "explicit" : "implicit",
1260                          core_alua_dump_state(new_state));
1261         }
1262
1263         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1264         smp_mb__after_atomic();
1265         return rc;
1266 }
1267
1268 /*
1269  * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1270  */
1271 static int core_alua_update_tpg_secondary_metadata(
1272         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1273         struct se_port *port)
1274 {
1275         unsigned char *md_buf;
1276         struct se_portal_group *se_tpg = port->sep_tpg;
1277         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1278         int len, rc;
1279
1280         md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1281         if (!md_buf) {
1282                 pr_err("Unable to allocate buf for ALUA metadata\n");
1283                 return -ENOMEM;
1284         }
1285
1286         memset(path, 0, ALUA_METADATA_PATH_LEN);
1287         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1288
1289         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1290                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1291
1292         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1293                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1294                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1295
1296         len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1297                         "alua_tg_pt_status=0x%02x\n",
1298                         atomic_read(&port->sep_tg_pt_secondary_offline),
1299                         port->sep_tg_pt_secondary_stat);
1300
1301         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1302                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1303                         port->sep_lun->unpacked_lun);
1304
1305         rc = core_alua_write_tpg_metadata(path, md_buf, len);
1306         kfree(md_buf);
1307
1308         return rc;
1309 }
1310
1311 static int core_alua_set_tg_pt_secondary_state(
1312         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1313         struct se_port *port,
1314         int explicit,
1315         int offline)
1316 {
1317         struct t10_alua_tg_pt_gp *tg_pt_gp;
1318         int trans_delay_msecs;
1319
1320         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1321         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1322         if (!tg_pt_gp) {
1323                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1324                 pr_err("Unable to complete secondary state"
1325                                 " transition\n");
1326                 return -EINVAL;
1327         }
1328         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1329         /*
1330          * Set the secondary ALUA target port access state to OFFLINE
1331          * or release the previously secondary state for struct se_port
1332          */
1333         if (offline)
1334                 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1335         else
1336                 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1337
1338         port->sep_tg_pt_secondary_stat = (explicit) ?
1339                         ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1340                         ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1341
1342         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1343                 " to secondary access state: %s\n", (explicit) ? "explicit" :
1344                 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1345                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1346
1347         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1348         /*
1349          * Do the optional transition delay after we set the secondary
1350          * ALUA access state.
1351          */
1352         if (trans_delay_msecs != 0)
1353                 msleep_interruptible(trans_delay_msecs);
1354         /*
1355          * See if we need to update the ALUA fabric port metadata for
1356          * secondary state and status
1357          */
1358         if (port->sep_tg_pt_secondary_write_md) {
1359                 mutex_lock(&port->sep_tg_pt_md_mutex);
1360                 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1361                 mutex_unlock(&port->sep_tg_pt_md_mutex);
1362         }
1363
1364         return 0;
1365 }
1366
1367 struct t10_alua_lba_map *
1368 core_alua_allocate_lba_map(struct list_head *list,
1369                            u64 first_lba, u64 last_lba)
1370 {
1371         struct t10_alua_lba_map *lba_map;
1372
1373         lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1374         if (!lba_map) {
1375                 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1376                 return ERR_PTR(-ENOMEM);
1377         }
1378         INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1379         lba_map->lba_map_first_lba = first_lba;
1380         lba_map->lba_map_last_lba = last_lba;
1381
1382         list_add_tail(&lba_map->lba_map_list, list);
1383         return lba_map;
1384 }
1385
1386 int
1387 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1388                                int pg_id, int state)
1389 {
1390         struct t10_alua_lba_map_member *lba_map_mem;
1391
1392         list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1393                             lba_map_mem_list) {
1394                 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1395                         pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1396                         return -EINVAL;
1397                 }
1398         }
1399
1400         lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1401         if (!lba_map_mem) {
1402                 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1403                 return -ENOMEM;
1404         }
1405         lba_map_mem->lba_map_mem_alua_state = state;
1406         lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1407
1408         list_add_tail(&lba_map_mem->lba_map_mem_list,
1409                       &lba_map->lba_map_mem_list);
1410         return 0;
1411 }
1412
1413 void
1414 core_alua_free_lba_map(struct list_head *lba_list)
1415 {
1416         struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1417         struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1418
1419         list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1420                                  lba_map_list) {
1421                 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1422                                          &lba_map->lba_map_mem_list,
1423                                          lba_map_mem_list) {
1424                         list_del(&lba_map_mem->lba_map_mem_list);
1425                         kmem_cache_free(t10_alua_lba_map_mem_cache,
1426                                         lba_map_mem);
1427                 }
1428                 list_del(&lba_map->lba_map_list);
1429                 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1430         }
1431 }
1432
1433 void
1434 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1435                       int segment_size, int segment_mult)
1436 {
1437         struct list_head old_lba_map_list;
1438         struct t10_alua_tg_pt_gp *tg_pt_gp;
1439         int activate = 0, supported;
1440
1441         INIT_LIST_HEAD(&old_lba_map_list);
1442         spin_lock(&dev->t10_alua.lba_map_lock);
1443         dev->t10_alua.lba_map_segment_size = segment_size;
1444         dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1445         list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1446         if (lba_map_list) {
1447                 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1448                 activate = 1;
1449         }
1450         spin_unlock(&dev->t10_alua.lba_map_lock);
1451         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1452         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1453                             tg_pt_gp_list) {
1454
1455                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1456                         continue;
1457                 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1458                 if (activate)
1459                         supported |= ALUA_LBD_SUP;
1460                 else
1461                         supported &= ~ALUA_LBD_SUP;
1462                 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1463         }
1464         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1465         core_alua_free_lba_map(&old_lba_map_list);
1466 }
1467
1468 struct t10_alua_lu_gp *
1469 core_alua_allocate_lu_gp(const char *name, int def_group)
1470 {
1471         struct t10_alua_lu_gp *lu_gp;
1472
1473         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1474         if (!lu_gp) {
1475                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1476                 return ERR_PTR(-ENOMEM);
1477         }
1478         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1479         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1480         spin_lock_init(&lu_gp->lu_gp_lock);
1481         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1482
1483         if (def_group) {
1484                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1485                 lu_gp->lu_gp_valid_id = 1;
1486                 alua_lu_gps_count++;
1487         }
1488
1489         return lu_gp;
1490 }
1491
1492 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1493 {
1494         struct t10_alua_lu_gp *lu_gp_tmp;
1495         u16 lu_gp_id_tmp;
1496         /*
1497          * The lu_gp->lu_gp_id may only be set once..
1498          */
1499         if (lu_gp->lu_gp_valid_id) {
1500                 pr_warn("ALUA LU Group already has a valid ID,"
1501                         " ignoring request\n");
1502                 return -EINVAL;
1503         }
1504
1505         spin_lock(&lu_gps_lock);
1506         if (alua_lu_gps_count == 0x0000ffff) {
1507                 pr_err("Maximum ALUA alua_lu_gps_count:"
1508                                 " 0x0000ffff reached\n");
1509                 spin_unlock(&lu_gps_lock);
1510                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1511                 return -ENOSPC;
1512         }
1513 again:
1514         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1515                                 alua_lu_gps_counter++;
1516
1517         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1518                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1519                         if (!lu_gp_id)
1520                                 goto again;
1521
1522                         pr_warn("ALUA Logical Unit Group ID: %hu"
1523                                 " already exists, ignoring request\n",
1524                                 lu_gp_id);
1525                         spin_unlock(&lu_gps_lock);
1526                         return -EINVAL;
1527                 }
1528         }
1529
1530         lu_gp->lu_gp_id = lu_gp_id_tmp;
1531         lu_gp->lu_gp_valid_id = 1;
1532         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1533         alua_lu_gps_count++;
1534         spin_unlock(&lu_gps_lock);
1535
1536         return 0;
1537 }
1538
1539 static struct t10_alua_lu_gp_member *
1540 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1541 {
1542         struct t10_alua_lu_gp_member *lu_gp_mem;
1543
1544         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1545         if (!lu_gp_mem) {
1546                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1547                 return ERR_PTR(-ENOMEM);
1548         }
1549         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1550         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1551         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1552
1553         lu_gp_mem->lu_gp_mem_dev = dev;
1554         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1555
1556         return lu_gp_mem;
1557 }
1558
1559 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1560 {
1561         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1562         /*
1563          * Once we have reached this point, config_item_put() has
1564          * already been called from target_core_alua_drop_lu_gp().
1565          *
1566          * Here, we remove the *lu_gp from the global list so that
1567          * no associations can be made while we are releasing
1568          * struct t10_alua_lu_gp.
1569          */
1570         spin_lock(&lu_gps_lock);
1571         list_del(&lu_gp->lu_gp_node);
1572         alua_lu_gps_count--;
1573         spin_unlock(&lu_gps_lock);
1574         /*
1575          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1576          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1577          * released with core_alua_put_lu_gp_from_name()
1578          */
1579         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1580                 cpu_relax();
1581         /*
1582          * Release reference to struct t10_alua_lu_gp * from all associated
1583          * struct se_device.
1584          */
1585         spin_lock(&lu_gp->lu_gp_lock);
1586         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1587                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1588                 if (lu_gp_mem->lu_gp_assoc) {
1589                         list_del(&lu_gp_mem->lu_gp_mem_list);
1590                         lu_gp->lu_gp_members--;
1591                         lu_gp_mem->lu_gp_assoc = 0;
1592                 }
1593                 spin_unlock(&lu_gp->lu_gp_lock);
1594                 /*
1595                  *
1596                  * lu_gp_mem is associated with a single
1597                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1598                  * struct se_device is released via core_alua_free_lu_gp_mem().
1599                  *
1600                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1601                  * we want to re-associate a given lu_gp_mem with default_lu_gp.
1602                  */
1603                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1604                 if (lu_gp != default_lu_gp)
1605                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1606                                         default_lu_gp);
1607                 else
1608                         lu_gp_mem->lu_gp = NULL;
1609                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1610
1611                 spin_lock(&lu_gp->lu_gp_lock);
1612         }
1613         spin_unlock(&lu_gp->lu_gp_lock);
1614
1615         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1616 }
1617
1618 void core_alua_free_lu_gp_mem(struct se_device *dev)
1619 {
1620         struct t10_alua_lu_gp *lu_gp;
1621         struct t10_alua_lu_gp_member *lu_gp_mem;
1622
1623         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1624         if (!lu_gp_mem)
1625                 return;
1626
1627         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1628                 cpu_relax();
1629
1630         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1631         lu_gp = lu_gp_mem->lu_gp;
1632         if (lu_gp) {
1633                 spin_lock(&lu_gp->lu_gp_lock);
1634                 if (lu_gp_mem->lu_gp_assoc) {
1635                         list_del(&lu_gp_mem->lu_gp_mem_list);
1636                         lu_gp->lu_gp_members--;
1637                         lu_gp_mem->lu_gp_assoc = 0;
1638                 }
1639                 spin_unlock(&lu_gp->lu_gp_lock);
1640                 lu_gp_mem->lu_gp = NULL;
1641         }
1642         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1643
1644         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1645 }
1646
1647 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1648 {
1649         struct t10_alua_lu_gp *lu_gp;
1650         struct config_item *ci;
1651
1652         spin_lock(&lu_gps_lock);
1653         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1654                 if (!lu_gp->lu_gp_valid_id)
1655                         continue;
1656                 ci = &lu_gp->lu_gp_group.cg_item;
1657                 if (!strcmp(config_item_name(ci), name)) {
1658                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1659                         spin_unlock(&lu_gps_lock);
1660                         return lu_gp;
1661                 }
1662         }
1663         spin_unlock(&lu_gps_lock);
1664
1665         return NULL;
1666 }
1667
1668 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1669 {
1670         spin_lock(&lu_gps_lock);
1671         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1672         spin_unlock(&lu_gps_lock);
1673 }
1674
1675 /*
1676  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1677  */
1678 void __core_alua_attach_lu_gp_mem(
1679         struct t10_alua_lu_gp_member *lu_gp_mem,
1680         struct t10_alua_lu_gp *lu_gp)
1681 {
1682         spin_lock(&lu_gp->lu_gp_lock);
1683         lu_gp_mem->lu_gp = lu_gp;
1684         lu_gp_mem->lu_gp_assoc = 1;
1685         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1686         lu_gp->lu_gp_members++;
1687         spin_unlock(&lu_gp->lu_gp_lock);
1688 }
1689
1690 /*
1691  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1692  */
1693 void __core_alua_drop_lu_gp_mem(
1694         struct t10_alua_lu_gp_member *lu_gp_mem,
1695         struct t10_alua_lu_gp *lu_gp)
1696 {
1697         spin_lock(&lu_gp->lu_gp_lock);
1698         list_del(&lu_gp_mem->lu_gp_mem_list);
1699         lu_gp_mem->lu_gp = NULL;
1700         lu_gp_mem->lu_gp_assoc = 0;
1701         lu_gp->lu_gp_members--;
1702         spin_unlock(&lu_gp->lu_gp_lock);
1703 }
1704
1705 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1706                 const char *name, int def_group)
1707 {
1708         struct t10_alua_tg_pt_gp *tg_pt_gp;
1709
1710         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1711         if (!tg_pt_gp) {
1712                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1713                 return NULL;
1714         }
1715         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1716         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1717         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1718         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1719         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1720         INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1721                           core_alua_do_transition_tg_pt_work);
1722         tg_pt_gp->tg_pt_gp_dev = dev;
1723         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1724                 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1725         /*
1726          * Enable both explicit and implicit ALUA support by default
1727          */
1728         tg_pt_gp->tg_pt_gp_alua_access_type =
1729                         TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1730         /*
1731          * Set the default Active/NonOptimized Delay in milliseconds
1732          */
1733         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1734         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1735         tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1736
1737         /*
1738          * Enable all supported states
1739          */
1740         tg_pt_gp->tg_pt_gp_alua_supported_states =
1741             ALUA_T_SUP | ALUA_O_SUP |
1742             ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1743
1744         if (def_group) {
1745                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1746                 tg_pt_gp->tg_pt_gp_id =
1747                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1748                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1749                 dev->t10_alua.alua_tg_pt_gps_count++;
1750                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1751                               &dev->t10_alua.tg_pt_gps_list);
1752                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1753         }
1754
1755         return tg_pt_gp;
1756 }
1757
1758 int core_alua_set_tg_pt_gp_id(
1759         struct t10_alua_tg_pt_gp *tg_pt_gp,
1760         u16 tg_pt_gp_id)
1761 {
1762         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1763         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1764         u16 tg_pt_gp_id_tmp;
1765
1766         /*
1767          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1768          */
1769         if (tg_pt_gp->tg_pt_gp_valid_id) {
1770                 pr_warn("ALUA TG PT Group already has a valid ID,"
1771                         " ignoring request\n");
1772                 return -EINVAL;
1773         }
1774
1775         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1776         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1777                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1778                         " 0x0000ffff reached\n");
1779                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1780                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1781                 return -ENOSPC;
1782         }
1783 again:
1784         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1785                         dev->t10_alua.alua_tg_pt_gps_counter++;
1786
1787         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1788                         tg_pt_gp_list) {
1789                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1790                         if (!tg_pt_gp_id)
1791                                 goto again;
1792
1793                         pr_err("ALUA Target Port Group ID: %hu already"
1794                                 " exists, ignoring request\n", tg_pt_gp_id);
1795                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1796                         return -EINVAL;
1797                 }
1798         }
1799
1800         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1801         tg_pt_gp->tg_pt_gp_valid_id = 1;
1802         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1803                         &dev->t10_alua.tg_pt_gps_list);
1804         dev->t10_alua.alua_tg_pt_gps_count++;
1805         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1806
1807         return 0;
1808 }
1809
1810 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1811         struct se_port *port)
1812 {
1813         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1814
1815         tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1816                                 GFP_KERNEL);
1817         if (!tg_pt_gp_mem) {
1818                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1819                 return ERR_PTR(-ENOMEM);
1820         }
1821         INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1822         spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1823         atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1824
1825         tg_pt_gp_mem->tg_pt = port;
1826         port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1827
1828         return tg_pt_gp_mem;
1829 }
1830
1831 void core_alua_free_tg_pt_gp(
1832         struct t10_alua_tg_pt_gp *tg_pt_gp)
1833 {
1834         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1835         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1836
1837         /*
1838          * Once we have reached this point, config_item_put() has already
1839          * been called from target_core_alua_drop_tg_pt_gp().
1840          *
1841          * Here we remove *tg_pt_gp from the global list so that
1842          * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1843          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1844          */
1845         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1846         list_del(&tg_pt_gp->tg_pt_gp_list);
1847         dev->t10_alua.alua_tg_pt_gps_counter--;
1848         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1849
1850         flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1851
1852         /*
1853          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1854          * core_alua_get_tg_pt_gp_by_name() in
1855          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1856          * to be released with core_alua_put_tg_pt_gp_from_name().
1857          */
1858         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1859                 cpu_relax();
1860
1861         /*
1862          * Release reference to struct t10_alua_tg_pt_gp from all associated
1863          * struct se_port.
1864          */
1865         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1866         list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1867                         &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1868                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1869                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1870                         tg_pt_gp->tg_pt_gp_members--;
1871                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1872                 }
1873                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1874                 /*
1875                  * tg_pt_gp_mem is associated with a single
1876                  * se_port->sep_alua_tg_pt_gp_mem, and is released via
1877                  * core_alua_free_tg_pt_gp_mem().
1878                  *
1879                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1880                  * assume we want to re-associate a given tg_pt_gp_mem with
1881                  * default_tg_pt_gp.
1882                  */
1883                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1884                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1885                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1886                                         dev->t10_alua.default_tg_pt_gp);
1887                 } else
1888                         tg_pt_gp_mem->tg_pt_gp = NULL;
1889                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1890
1891                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1892         }
1893         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1894
1895         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1896 }
1897
1898 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1899 {
1900         struct t10_alua_tg_pt_gp *tg_pt_gp;
1901         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1902
1903         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1904         if (!tg_pt_gp_mem)
1905                 return;
1906
1907         while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1908                 cpu_relax();
1909
1910         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1911         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1912         if (tg_pt_gp) {
1913                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1914                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1915                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1916                         tg_pt_gp->tg_pt_gp_members--;
1917                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1918                 }
1919                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1920                 tg_pt_gp_mem->tg_pt_gp = NULL;
1921         }
1922         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1923
1924         kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1925 }
1926
1927 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1928                 struct se_device *dev, const char *name)
1929 {
1930         struct t10_alua_tg_pt_gp *tg_pt_gp;
1931         struct config_item *ci;
1932
1933         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1934         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1935                         tg_pt_gp_list) {
1936                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1937                         continue;
1938                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1939                 if (!strcmp(config_item_name(ci), name)) {
1940                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1941                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1942                         return tg_pt_gp;
1943                 }
1944         }
1945         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1946
1947         return NULL;
1948 }
1949
1950 static void core_alua_put_tg_pt_gp_from_name(
1951         struct t10_alua_tg_pt_gp *tg_pt_gp)
1952 {
1953         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1954
1955         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1956         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1957         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1958 }
1959
1960 /*
1961  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1962  */
1963 void __core_alua_attach_tg_pt_gp_mem(
1964         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1965         struct t10_alua_tg_pt_gp *tg_pt_gp)
1966 {
1967         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1968         tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1969         tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1970         list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1971                         &tg_pt_gp->tg_pt_gp_mem_list);
1972         tg_pt_gp->tg_pt_gp_members++;
1973         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1974 }
1975
1976 /*
1977  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1978  */
1979 static void __core_alua_drop_tg_pt_gp_mem(
1980         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1981         struct t10_alua_tg_pt_gp *tg_pt_gp)
1982 {
1983         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1984         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1985         tg_pt_gp_mem->tg_pt_gp = NULL;
1986         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1987         tg_pt_gp->tg_pt_gp_members--;
1988         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1989 }
1990
1991 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1992 {
1993         struct config_item *tg_pt_ci;
1994         struct t10_alua_tg_pt_gp *tg_pt_gp;
1995         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1996         ssize_t len = 0;
1997
1998         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1999         if (!tg_pt_gp_mem)
2000                 return len;
2001
2002         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2003         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2004         if (tg_pt_gp) {
2005                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
2006                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
2007                         " %hu\nTG Port Primary Access State: %s\nTG Port "
2008                         "Primary Access Status: %s\nTG Port Secondary Access"
2009                         " State: %s\nTG Port Secondary Access Status: %s\n",
2010                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
2011                         core_alua_dump_state(atomic_read(
2012                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
2013                         core_alua_dump_status(
2014                                 tg_pt_gp->tg_pt_gp_alua_access_status),
2015                         (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2016                         "Offline" : "None",
2017                         core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2018         }
2019         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2020
2021         return len;
2022 }
2023
2024 ssize_t core_alua_store_tg_pt_gp_info(
2025         struct se_port *port,
2026         const char *page,
2027         size_t count)
2028 {
2029         struct se_portal_group *tpg;
2030         struct se_lun *lun;
2031         struct se_device *dev = port->sep_lun->lun_se_dev;
2032         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2033         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2034         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2035         int move = 0;
2036
2037         tpg = port->sep_tpg;
2038         lun = port->sep_lun;
2039
2040         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2041         if (!tg_pt_gp_mem)
2042                 return 0;
2043
2044         if (count > TG_PT_GROUP_NAME_BUF) {
2045                 pr_err("ALUA Target Port Group alias too large!\n");
2046                 return -EINVAL;
2047         }
2048         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2049         memcpy(buf, page, count);
2050         /*
2051          * Any ALUA target port group alias besides "NULL" means we will be
2052          * making a new group association.
2053          */
2054         if (strcmp(strstrip(buf), "NULL")) {
2055                 /*
2056                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
2057                  * struct t10_alua_tg_pt_gp.  This reference is released with
2058                  * core_alua_put_tg_pt_gp_from_name() below.
2059                  */
2060                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2061                                         strstrip(buf));
2062                 if (!tg_pt_gp_new)
2063                         return -ENODEV;
2064         }
2065
2066         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2067         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2068         if (tg_pt_gp) {
2069                 /*
2070                  * Clearing an existing tg_pt_gp association, and replacing
2071                  * with the default_tg_pt_gp.
2072                  */
2073                 if (!tg_pt_gp_new) {
2074                         pr_debug("Target_Core_ConfigFS: Moving"
2075                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2076                                 " alua/%s, ID: %hu back to"
2077                                 " default_tg_pt_gp\n",
2078                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2079                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2080                                 config_item_name(&lun->lun_group.cg_item),
2081                                 config_item_name(
2082                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
2083                                 tg_pt_gp->tg_pt_gp_id);
2084
2085                         __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2086                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2087                                         dev->t10_alua.default_tg_pt_gp);
2088                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2089
2090                         return count;
2091                 }
2092                 /*
2093                  * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2094                  */
2095                 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2096                 move = 1;
2097         }
2098         /*
2099          * Associate tg_pt_gp_mem with tg_pt_gp_new.
2100          */
2101         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2102         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2103         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2104                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2105                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2106                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2107                 config_item_name(&lun->lun_group.cg_item),
2108                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2109                 tg_pt_gp_new->tg_pt_gp_id);
2110
2111         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2112         return count;
2113 }
2114
2115 ssize_t core_alua_show_access_type(
2116         struct t10_alua_tg_pt_gp *tg_pt_gp,
2117         char *page)
2118 {
2119         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2120             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2121                 return sprintf(page, "Implicit and Explicit\n");
2122         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2123                 return sprintf(page, "Implicit\n");
2124         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2125                 return sprintf(page, "Explicit\n");
2126         else
2127                 return sprintf(page, "None\n");
2128 }
2129
2130 ssize_t core_alua_store_access_type(
2131         struct t10_alua_tg_pt_gp *tg_pt_gp,
2132         const char *page,
2133         size_t count)
2134 {
2135         unsigned long tmp;
2136         int ret;
2137
2138         ret = kstrtoul(page, 0, &tmp);
2139         if (ret < 0) {
2140                 pr_err("Unable to extract alua_access_type\n");
2141                 return ret;
2142         }
2143         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2144                 pr_err("Illegal value for alua_access_type:"
2145                                 " %lu\n", tmp);
2146                 return -EINVAL;
2147         }
2148         if (tmp == 3)
2149                 tg_pt_gp->tg_pt_gp_alua_access_type =
2150                         TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2151         else if (tmp == 2)
2152                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2153         else if (tmp == 1)
2154                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2155         else
2156                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2157
2158         return count;
2159 }
2160
2161 ssize_t core_alua_show_nonop_delay_msecs(
2162         struct t10_alua_tg_pt_gp *tg_pt_gp,
2163         char *page)
2164 {
2165         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2166 }
2167
2168 ssize_t core_alua_store_nonop_delay_msecs(
2169         struct t10_alua_tg_pt_gp *tg_pt_gp,
2170         const char *page,
2171         size_t count)
2172 {
2173         unsigned long tmp;
2174         int ret;
2175
2176         ret = kstrtoul(page, 0, &tmp);
2177         if (ret < 0) {
2178                 pr_err("Unable to extract nonop_delay_msecs\n");
2179                 return ret;
2180         }
2181         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2182                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2183                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2184                         ALUA_MAX_NONOP_DELAY_MSECS);
2185                 return -EINVAL;
2186         }
2187         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2188
2189         return count;
2190 }
2191
2192 ssize_t core_alua_show_trans_delay_msecs(
2193         struct t10_alua_tg_pt_gp *tg_pt_gp,
2194         char *page)
2195 {
2196         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2197 }
2198
2199 ssize_t core_alua_store_trans_delay_msecs(
2200         struct t10_alua_tg_pt_gp *tg_pt_gp,
2201         const char *page,
2202         size_t count)
2203 {
2204         unsigned long tmp;
2205         int ret;
2206
2207         ret = kstrtoul(page, 0, &tmp);
2208         if (ret < 0) {
2209                 pr_err("Unable to extract trans_delay_msecs\n");
2210                 return ret;
2211         }
2212         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2213                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2214                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2215                         ALUA_MAX_TRANS_DELAY_MSECS);
2216                 return -EINVAL;
2217         }
2218         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2219
2220         return count;
2221 }
2222
2223 ssize_t core_alua_show_implicit_trans_secs(
2224         struct t10_alua_tg_pt_gp *tg_pt_gp,
2225         char *page)
2226 {
2227         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2228 }
2229
2230 ssize_t core_alua_store_implicit_trans_secs(
2231         struct t10_alua_tg_pt_gp *tg_pt_gp,
2232         const char *page,
2233         size_t count)
2234 {
2235         unsigned long tmp;
2236         int ret;
2237
2238         ret = kstrtoul(page, 0, &tmp);
2239         if (ret < 0) {
2240                 pr_err("Unable to extract implicit_trans_secs\n");
2241                 return ret;
2242         }
2243         if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2244                 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2245                         " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2246                         ALUA_MAX_IMPLICIT_TRANS_SECS);
2247                 return  -EINVAL;
2248         }
2249         tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2250
2251         return count;
2252 }
2253
2254 ssize_t core_alua_show_preferred_bit(
2255         struct t10_alua_tg_pt_gp *tg_pt_gp,
2256         char *page)
2257 {
2258         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2259 }
2260
2261 ssize_t core_alua_store_preferred_bit(
2262         struct t10_alua_tg_pt_gp *tg_pt_gp,
2263         const char *page,
2264         size_t count)
2265 {
2266         unsigned long tmp;
2267         int ret;
2268
2269         ret = kstrtoul(page, 0, &tmp);
2270         if (ret < 0) {
2271                 pr_err("Unable to extract preferred ALUA value\n");
2272                 return ret;
2273         }
2274         if ((tmp != 0) && (tmp != 1)) {
2275                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2276                 return -EINVAL;
2277         }
2278         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2279
2280         return count;
2281 }
2282
2283 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2284 {
2285         if (!lun->lun_sep)
2286                 return -ENODEV;
2287
2288         return sprintf(page, "%d\n",
2289                 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2290 }
2291
2292 ssize_t core_alua_store_offline_bit(
2293         struct se_lun *lun,
2294         const char *page,
2295         size_t count)
2296 {
2297         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2298         unsigned long tmp;
2299         int ret;
2300
2301         if (!lun->lun_sep)
2302                 return -ENODEV;
2303
2304         ret = kstrtoul(page, 0, &tmp);
2305         if (ret < 0) {
2306                 pr_err("Unable to extract alua_tg_pt_offline value\n");
2307                 return ret;
2308         }
2309         if ((tmp != 0) && (tmp != 1)) {
2310                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2311                                 tmp);
2312                 return -EINVAL;
2313         }
2314         tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2315         if (!tg_pt_gp_mem) {
2316                 pr_err("Unable to locate *tg_pt_gp_mem\n");
2317                 return -EINVAL;
2318         }
2319
2320         ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2321                         lun->lun_sep, 0, (int)tmp);
2322         if (ret < 0)
2323                 return -EINVAL;
2324
2325         return count;
2326 }
2327
2328 ssize_t core_alua_show_secondary_status(
2329         struct se_lun *lun,
2330         char *page)
2331 {
2332         return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2333 }
2334
2335 ssize_t core_alua_store_secondary_status(
2336         struct se_lun *lun,
2337         const char *page,
2338         size_t count)
2339 {
2340         unsigned long tmp;
2341         int ret;
2342
2343         ret = kstrtoul(page, 0, &tmp);
2344         if (ret < 0) {
2345                 pr_err("Unable to extract alua_tg_pt_status\n");
2346                 return ret;
2347         }
2348         if ((tmp != ALUA_STATUS_NONE) &&
2349             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2350             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2351                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2352                                 tmp);
2353                 return -EINVAL;
2354         }
2355         lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2356
2357         return count;
2358 }
2359
2360 ssize_t core_alua_show_secondary_write_metadata(
2361         struct se_lun *lun,
2362         char *page)
2363 {
2364         return sprintf(page, "%d\n",
2365                         lun->lun_sep->sep_tg_pt_secondary_write_md);
2366 }
2367
2368 ssize_t core_alua_store_secondary_write_metadata(
2369         struct se_lun *lun,
2370         const char *page,
2371         size_t count)
2372 {
2373         unsigned long tmp;
2374         int ret;
2375
2376         ret = kstrtoul(page, 0, &tmp);
2377         if (ret < 0) {
2378                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2379                 return ret;
2380         }
2381         if ((tmp != 0) && (tmp != 1)) {
2382                 pr_err("Illegal value for alua_tg_pt_write_md:"
2383                                 " %lu\n", tmp);
2384                 return -EINVAL;
2385         }
2386         lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2387
2388         return count;
2389 }
2390
2391 int core_setup_alua(struct se_device *dev)
2392 {
2393         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2394             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2395                 struct t10_alua_lu_gp_member *lu_gp_mem;
2396
2397                 /*
2398                  * Associate this struct se_device with the default ALUA
2399                  * LUN Group.
2400                  */
2401                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2402                 if (IS_ERR(lu_gp_mem))
2403                         return PTR_ERR(lu_gp_mem);
2404
2405                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2406                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2407                                 default_lu_gp);
2408                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2409
2410                 pr_debug("%s: Adding to default ALUA LU Group:"
2411                         " core/alua/lu_gps/default_lu_gp\n",
2412                         dev->transport->name);
2413         }
2414
2415         return 0;
2416 }