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