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 2009-2012 RisingTide Systems LLC.
   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 *primary);
  45 static int core_alua_set_tg_pt_secondary_state(
  46                 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  47                 struct se_port *port, int explict, int offline);
  48
  49 static u16 alua_lu_gps_counter;
  50 static u32 alua_lu_gps_count;
  51
  52 static DEFINE_SPINLOCK(lu_gps_lock);
  53 static LIST_HEAD(lu_gps_list);
  54
  55 struct t10_alua_lu_gp *default_lu_gp;
  56
  57 /*
  58  * REPORT_TARGET_PORT_GROUPS
  59  *
  60  * See spc4r17 section 6.27
  61  */
  62 sense_reason_t
  63 target_emulate_report_target_port_groups(struct se_cmd *cmd)
  64 {
  65         struct se_device *dev = cmd->se_dev;
  66         struct se_port *port;
  67         struct t10_alua_tg_pt_gp *tg_pt_gp;
  68         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  69         unsigned char *buf;
  70         u32 rd_len = 0, off;
  71         int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
  72
  73         /*
  74          * Skip over RESERVED area to first Target port group descriptor
  75          * depending on the PARAMETER DATA FORMAT type..
  76          */
  77         if (ext_hdr != 0)
  78                 off = 8;
  79         else
  80                 off = 4;
  81
  82         if (cmd->data_length < off) {
  83                 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
  84                         " small for %s header\n", cmd->data_length,
  85                         (ext_hdr) ? "extended" : "normal");
  86                 return TCM_INVALID_CDB_FIELD;
  87         }
  88         buf = transport_kmap_data_sg(cmd);
  89         if (!buf)
  90                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  91
  92         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  93         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
  94                         tg_pt_gp_list) {
  95                 /*
  96                  * Check if the Target port group and Target port descriptor list
  97                  * based on tg_pt_gp_members count will fit into the response payload.
  98                  * Otherwise, bump rd_len to let the initiator know we have exceeded
  99                  * the allocation length and the response is truncated.
 100                  */
 101                 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
 102                      cmd->data_length) {
 103                         rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
 104                         continue;
 105                 }
 106                 /*
 107                  * PREF: Preferred target port bit, determine if this
 108                  * bit should be set for port group.
 109                  */
 110                 if (tg_pt_gp->tg_pt_gp_pref)
 111                         buf[off] = 0x80;
 112                 /*
 113                  * Set the ASYMMETRIC ACCESS State
 114                  */
 115                 buf[off++] |= (atomic_read(
 116                         &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
 117                 /*
 118                  * Set supported ASYMMETRIC ACCESS State bits
 119                  */
 120                 buf[off] = 0x80; /* T_SUP */
 121                 buf[off] |= 0x40; /* O_SUP */
 122                 buf[off] |= 0x8; /* U_SUP */
 123                 buf[off] |= 0x4; /* S_SUP */
 124                 buf[off] |= 0x2; /* AN_SUP */
 125                 buf[off++] |= 0x1; /* AO_SUP */
 126                 /*
 127                  * TARGET PORT GROUP
 128                  */
 129                 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
 130                 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
 131
 132                 off++; /* Skip over Reserved */
 133                 /*
 134                  * STATUS CODE
 135                  */
 136                 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
 137                 /*
 138                  * Vendor Specific field
 139                  */
 140                 buf[off++] = 0x00;
 141                 /*
 142                  * TARGET PORT COUNT
 143                  */
 144                 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
 145                 rd_len += 8;
 146
 147                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 148                 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
 149                                 tg_pt_gp_mem_list) {
 150                         port = tg_pt_gp_mem->tg_pt;
 151                         /*
 152                          * Start Target Port descriptor format
 153                          *
 154                          * See spc4r17 section 6.2.7 Table 247
 155                          */
 156                         off += 2; /* Skip over Obsolete */
 157                         /*
 158                          * Set RELATIVE TARGET PORT IDENTIFIER
 159                          */
 160                         buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 161                         buf[off++] = (port->sep_rtpi & 0xff);
 162                         rd_len += 4;
 163                 }
 164                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 165         }
 166         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 167         /*
 168          * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
 169          */
 170         put_unaligned_be32(rd_len, &buf[0]);
 171
 172         /*
 173          * Fill in the Extended header parameter data format if requested
 174          */
 175         if (ext_hdr != 0) {
 176                 buf[4] = 0x10;
 177                 /*
 178                  * Set the implict transition time (in seconds) for the application
 179                  * client to use as a base for it's transition timeout value.
 180                  *
 181                  * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
 182                  * this CDB was received upon to determine this value individually
 183                  * for ALUA target port group.
 184                  */
 185                 port = cmd->se_lun->lun_sep;
 186                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 187                 if (tg_pt_gp_mem) {
 188                         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 189                         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 190                         if (tg_pt_gp)
 191                                 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
 192                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 193                 }
 194         }
 195         transport_kunmap_data_sg(cmd);
 196
 197         target_complete_cmd(cmd, GOOD);
 198         return 0;
 199 }
 200
 201 /*
 202  * SET_TARGET_PORT_GROUPS for explict ALUA operation.
 203  *
 204  * See spc4r17 section 6.35
 205  */
 206 sense_reason_t
 207 target_emulate_set_target_port_groups(struct se_cmd *cmd)
 208 {
 209         struct se_device *dev = cmd->se_dev;
 210         struct se_port *port, *l_port = cmd->se_lun->lun_sep;
 211         struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
 212         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
 213         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
 214         unsigned char *buf;
 215         unsigned char *ptr;
 216         sense_reason_t rc = TCM_NO_SENSE;
 217         u32 len = 4; /* Skip over RESERVED area in header */
 218         int alua_access_state, primary = 0;
 219         u16 tg_pt_id, rtpi;
 220
 221         if (!l_port)
 222                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 223
 224         if (cmd->data_length < 4) {
 225                 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
 226                         " small\n", cmd->data_length);
 227                 return TCM_INVALID_PARAMETER_LIST;
 228         }
 229
 230         buf = transport_kmap_data_sg(cmd);
 231         if (!buf)
 232                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 233
 234         /*
 235          * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
 236          * for the local tg_pt_gp.
 237          */
 238         l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
 239         if (!l_tg_pt_gp_mem) {
 240                 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
 241                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 242                 goto out;
 243         }
 244         spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 245         l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
 246         if (!l_tg_pt_gp) {
 247                 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 248                 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
 249                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 250                 goto out;
 251         }
 252         spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
 253
 254         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) {
 255                 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
 256                                 " while TPGS_EXPLICT_ALUA is disabled\n");
 257                 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
 258                 goto out;
 259         }
 260
 261         ptr = &buf[4]; /* Skip over RESERVED area in header */
 262
 263         while (len < cmd->data_length) {
 264                 bool found = false;
 265                 alua_access_state = (ptr[0] & 0x0f);
 266                 /*
 267                  * Check the received ALUA access state, and determine if
 268                  * the state is a primary or secondary target port asymmetric
 269                  * access state.
 270                  */
 271                 rc = core_alua_check_transition(alua_access_state, &primary);
 272                 if (rc) {
 273                         /*
 274                          * If the SET TARGET PORT GROUPS attempts to establish
 275                          * an invalid combination of target port asymmetric
 276                          * access states or attempts to establish an
 277                          * unsupported target port asymmetric access state,
 278                          * then the command shall be terminated with CHECK
 279                          * CONDITION status, with the sense key set to ILLEGAL
 280                          * REQUEST, and the additional sense code set to INVALID
 281                          * FIELD IN PARAMETER LIST.
 282                          */
 283                         goto out;
 284                 }
 285
 286                 /*
 287                  * If the ASYMMETRIC ACCESS STATE field (see table 267)
 288                  * specifies a primary target port asymmetric access state,
 289                  * then the TARGET PORT GROUP OR TARGET PORT field specifies
 290                  * a primary target port group for which the primary target
 291                  * port asymmetric access state shall be changed. If the
 292                  * ASYMMETRIC ACCESS STATE field specifies a secondary target
 293                  * port asymmetric access state, then the TARGET PORT GROUP OR
 294                  * TARGET PORT field specifies the relative target port
 295                  * identifier (see 3.1.120) of the target port for which the
 296                  * secondary target port asymmetric access state shall be
 297                  * changed.
 298                  */
 299                 if (primary) {
 300                         tg_pt_id = get_unaligned_be16(ptr + 2);
 301                         /*
 302                          * Locate the matching target port group ID from
 303                          * the global tg_pt_gp list
 304                          */
 305                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 306                         list_for_each_entry(tg_pt_gp,
 307                                         &dev->t10_alua.tg_pt_gps_list,
 308                                         tg_pt_gp_list) {
 309                                 if (!tg_pt_gp->tg_pt_gp_valid_id)
 310                                         continue;
 311
 312                                 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
 313                                         continue;
 314
 315                                 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
 316                                 smp_mb__after_atomic_inc();
 317
 318                                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 319
 320                                 if (!core_alua_do_port_transition(tg_pt_gp,
 321                                                 dev, l_port, nacl,
 322                                                 alua_access_state, 1))
 323                                         found = true;
 324
 325                                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 326                                 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
 327                                 smp_mb__after_atomic_dec();
 328                                 break;
 329                         }
 330                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 331                 } else {
 332                         /*
 333                          * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
 334                          * the Target Port in question for the the incoming
 335                          * SET_TARGET_PORT_GROUPS op.
 336                          */
 337                         rtpi = get_unaligned_be16(ptr + 2);
 338                         /*
 339                          * Locate the matching relative target port identifier
 340                          * for the struct se_device storage object.
 341                          */
 342                         spin_lock(&dev->se_port_lock);
 343                         list_for_each_entry(port, &dev->dev_sep_list,
 344                                                         sep_list) {
 345                                 if (port->sep_rtpi != rtpi)
 346                                         continue;
 347
 348                                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 349
 350                                 spin_unlock(&dev->se_port_lock);
 351
 352                                 if (!core_alua_set_tg_pt_secondary_state(
 353                                                 tg_pt_gp_mem, port, 1, 1))
 354                                         found = true;
 355
 356                                 spin_lock(&dev->se_port_lock);
 357                                 break;
 358                         }
 359                         spin_unlock(&dev->se_port_lock);
 360                 }
 361
 362                 if (!found) {
 363                         rc = TCM_INVALID_PARAMETER_LIST;
 364                         goto out;
 365                 }
 366
 367                 ptr += 4;
 368                 len += 4;
 369         }
 370
 371 out:
 372         transport_kunmap_data_sg(cmd);
 373         if (!rc)
 374                 target_complete_cmd(cmd, GOOD);
 375         return rc;
 376 }
 377
 378 static inline int core_alua_state_nonoptimized(
 379         struct se_cmd *cmd,
 380         unsigned char *cdb,
 381         int nonop_delay_msecs,
 382         u8 *alua_ascq)
 383 {
 384         /*
 385          * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
 386          * later to determine if processing of this cmd needs to be
 387          * temporarily delayed for the Active/NonOptimized primary access state.
 388          */
 389         cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
 390         cmd->alua_nonop_delay = nonop_delay_msecs;
 391         return 0;
 392 }
 393
 394 static inline int core_alua_state_standby(
 395         struct se_cmd *cmd,
 396         unsigned char *cdb,
 397         u8 *alua_ascq)
 398 {
 399         /*
 400          * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
 401          * spc4r17 section 5.9.2.4.4
 402          */
 403         switch (cdb[0]) {
 404         case INQUIRY:
 405         case LOG_SELECT:
 406         case LOG_SENSE:
 407         case MODE_SELECT:
 408         case MODE_SENSE:
 409         case REPORT_LUNS:
 410         case RECEIVE_DIAGNOSTIC:
 411         case SEND_DIAGNOSTIC:
 412         case MAINTENANCE_IN:
 413                 switch (cdb[1] & 0x1f) {
 414                 case MI_REPORT_TARGET_PGS:
 415                         return 0;
 416                 default:
 417                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 418                         return 1;
 419                 }
 420         case MAINTENANCE_OUT:
 421                 switch (cdb[1]) {
 422                 case MO_SET_TARGET_PGS:
 423                         return 0;
 424                 default:
 425                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 426                         return 1;
 427                 }
 428         case REQUEST_SENSE:
 429         case PERSISTENT_RESERVE_IN:
 430         case PERSISTENT_RESERVE_OUT:
 431         case READ_BUFFER:
 432         case WRITE_BUFFER:
 433                 return 0;
 434         default:
 435                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 436                 return 1;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static inline int core_alua_state_unavailable(
 443         struct se_cmd *cmd,
 444         unsigned char *cdb,
 445         u8 *alua_ascq)
 446 {
 447         /*
 448          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 449          * spc4r17 section 5.9.2.4.5
 450          */
 451         switch (cdb[0]) {
 452         case INQUIRY:
 453         case REPORT_LUNS:
 454         case MAINTENANCE_IN:
 455                 switch (cdb[1] & 0x1f) {
 456                 case MI_REPORT_TARGET_PGS:
 457                         return 0;
 458                 default:
 459                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 460                         return 1;
 461                 }
 462         case MAINTENANCE_OUT:
 463                 switch (cdb[1]) {
 464                 case MO_SET_TARGET_PGS:
 465                         return 0;
 466                 default:
 467                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 468                         return 1;
 469                 }
 470         case REQUEST_SENSE:
 471         case READ_BUFFER:
 472         case WRITE_BUFFER:
 473                 return 0;
 474         default:
 475                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 476                 return 1;
 477         }
 478
 479         return 0;
 480 }
 481
 482 static inline int core_alua_state_transition(
 483         struct se_cmd *cmd,
 484         unsigned char *cdb,
 485         u8 *alua_ascq)
 486 {
 487         /*
 488          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
 489          * spc4r17 section 5.9.2.5
 490          */
 491         switch (cdb[0]) {
 492         case INQUIRY:
 493         case REPORT_LUNS:
 494         case MAINTENANCE_IN:
 495                 switch (cdb[1] & 0x1f) {
 496                 case MI_REPORT_TARGET_PGS:
 497                         return 0;
 498                 default:
 499                         *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 500                         return 1;
 501                 }
 502         case REQUEST_SENSE:
 503         case READ_BUFFER:
 504         case WRITE_BUFFER:
 505                 return 0;
 506         default:
 507                 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 508                 return 1;
 509         }
 510
 511         return 0;
 512 }
 513
 514 /*
 515  * return 1: Is used to signal LUN not accecsable, and check condition/not ready
 516  * return 0: Used to signal success
 517  * reutrn -1: Used to signal failure, and invalid cdb field
 518  */
 519 sense_reason_t
 520 target_alua_state_check(struct se_cmd *cmd)
 521 {
 522         struct se_device *dev = cmd->se_dev;
 523         unsigned char *cdb = cmd->t_task_cdb;
 524         struct se_lun *lun = cmd->se_lun;
 525         struct se_port *port = lun->lun_sep;
 526         struct t10_alua_tg_pt_gp *tg_pt_gp;
 527         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 528         int out_alua_state, nonop_delay_msecs;
 529         u8 alua_ascq;
 530         int ret;
 531
 532         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 533                 return 0;
 534         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
 535                 return 0;
 536
 537         if (!port)
 538                 return 0;
 539         /*
 540          * First, check for a struct se_port specific secondary ALUA target port
 541          * access state: OFFLINE
 542          */
 543         if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
 544                 pr_debug("ALUA: Got secondary offline status for local"
 545                                 " target port\n");
 546                 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
 547                 ret = 1;
 548                 goto out;
 549         }
 550          /*
 551          * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
 552          * ALUA target port group, to obtain current ALUA access state.
 553          * Otherwise look for the underlying struct se_device association with
 554          * a ALUA logical unit group.
 555          */
 556         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 557         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 558         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 559         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 560         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 561         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 562         /*
 563          * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
 564          * statement so the compiler knows explicitly to check this case first.
 565          * For the Optimized ALUA access state case, we want to process the
 566          * incoming fabric cmd ASAP..
 567          */
 568         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
 569                 return 0;
 570
 571         switch (out_alua_state) {
 572         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 573                 ret = core_alua_state_nonoptimized(cmd, cdb,
 574                                         nonop_delay_msecs, &alua_ascq);
 575                 break;
 576         case ALUA_ACCESS_STATE_STANDBY:
 577                 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
 578                 break;
 579         case ALUA_ACCESS_STATE_UNAVAILABLE:
 580                 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
 581                 break;
 582         case ALUA_ACCESS_STATE_TRANSITION:
 583                 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
 584                 break;
 585         /*
 586          * OFFLINE is a secondary ALUA target port group access state, that is
 587          * handled above with struct se_port->sep_tg_pt_secondary_offline=1
 588          */
 589         case ALUA_ACCESS_STATE_OFFLINE:
 590         default:
 591                 pr_err("Unknown ALUA access state: 0x%02x\n",
 592                                 out_alua_state);
 593                 return TCM_INVALID_CDB_FIELD;
 594         }
 595
 596 out:
 597         if (ret > 0) {
 598                 /*
 599                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 600                  * The ALUA additional sense code qualifier (ASCQ) is determined
 601                  * by the ALUA primary or secondary access state..
 602                  */
 603                 pr_debug("[%s]: ALUA TG Port not available, "
 604                         "SenseKey: NOT_READY, ASC/ASCQ: "
 605                         "0x04/0x%02x\n",
 606                         cmd->se_tfo->get_fabric_name(), alua_ascq);
 607
 608                 cmd->scsi_asc = 0x04;
 609                 cmd->scsi_ascq = alua_ascq;
 610                 return TCM_CHECK_CONDITION_NOT_READY;
 611         }
 612
 613         return 0;
 614 }
 615
 616 /*
 617  * Check implict and explict ALUA state change request.
 618  */
 619 static sense_reason_t
 620 core_alua_check_transition(int state, int *primary)
 621 {
 622         switch (state) {
 623         case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
 624         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 625         case ALUA_ACCESS_STATE_STANDBY:
 626         case ALUA_ACCESS_STATE_UNAVAILABLE:
 627                 /*
 628                  * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 629                  * defined as primary target port asymmetric access states.
 630                  */
 631                 *primary = 1;
 632                 break;
 633         case ALUA_ACCESS_STATE_OFFLINE:
 634                 /*
 635                  * OFFLINE state is defined as a secondary target port
 636                  * asymmetric access state.
 637                  */
 638                 *primary = 0;
 639                 break;
 640         default:
 641                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 642                 return TCM_INVALID_PARAMETER_LIST;
 643         }
 644
 645         return 0;
 646 }
 647
 648 static char *core_alua_dump_state(int state)
 649 {
 650         switch (state) {
 651         case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
 652                 return "Active/Optimized";
 653         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 654                 return "Active/NonOptimized";
 655         case ALUA_ACCESS_STATE_STANDBY:
 656                 return "Standby";
 657         case ALUA_ACCESS_STATE_UNAVAILABLE:
 658                 return "Unavailable";
 659         case ALUA_ACCESS_STATE_OFFLINE:
 660                 return "Offline";
 661         default:
 662                 return "Unknown";
 663         }
 664
 665         return NULL;
 666 }
 667
 668 char *core_alua_dump_status(int status)
 669 {
 670         switch (status) {
 671         case ALUA_STATUS_NONE:
 672                 return "None";
 673         case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
 674                 return "Altered by Explict STPG";
 675         case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
 676                 return "Altered by Implict ALUA";
 677         default:
 678                 return "Unknown";
 679         }
 680
 681         return NULL;
 682 }
 683
 684 /*
 685  * Used by fabric modules to determine when we need to delay processing
 686  * for the Active/NonOptimized paths..
 687  */
 688 int core_alua_check_nonop_delay(
 689         struct se_cmd *cmd)
 690 {
 691         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 692                 return 0;
 693         if (in_interrupt())
 694                 return 0;
 695         /*
 696          * The ALUA Active/NonOptimized access state delay can be disabled
 697          * in via configfs with a value of zero
 698          */
 699         if (!cmd->alua_nonop_delay)
 700                 return 0;
 701         /*
 702          * struct se_cmd->alua_nonop_delay gets set by a target port group
 703          * defined interval in core_alua_state_nonoptimized()
 704          */
 705         msleep_interruptible(cmd->alua_nonop_delay);
 706         return 0;
 707 }
 708 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 709
 710 /*
 711  * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
 712  *
 713  */
 714 static int core_alua_write_tpg_metadata(
 715         const char *path,
 716         unsigned char *md_buf,
 717         u32 md_buf_len)
 718 {
 719         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 720         int ret;
 721
 722         if (IS_ERR(file)) {
 723                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 724                 return -ENODEV;
 725         }
 726         ret = kernel_write(file, md_buf, md_buf_len, 0);
 727         if (ret < 0)
 728                 pr_err("Error writing ALUA metadata file: %s\n", path);
 729         fput(file);
 730         return ret ? -EIO : 0;
 731 }
 732
 733 /*
 734  * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 735  */
 736 static int core_alua_update_tpg_primary_metadata(
 737         struct t10_alua_tg_pt_gp *tg_pt_gp,
 738         int primary_state,
 739         unsigned char *md_buf)
 740 {
 741         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 742         char path[ALUA_METADATA_PATH_LEN];
 743         int len;
 744
 745         memset(path, 0, ALUA_METADATA_PATH_LEN);
 746
 747         len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
 748                         "tg_pt_gp_id=%hu\n"
 749                         "alua_access_state=0x%02x\n"
 750                         "alua_access_status=0x%02x\n",
 751                         tg_pt_gp->tg_pt_gp_id, primary_state,
 752                         tg_pt_gp->tg_pt_gp_alua_access_status);
 753
 754         snprintf(path, ALUA_METADATA_PATH_LEN,
 755                 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
 756                 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 757
 758         return core_alua_write_tpg_metadata(path, md_buf, len);
 759 }
 760
 761 static int core_alua_do_transition_tg_pt(
 762         struct t10_alua_tg_pt_gp *tg_pt_gp,
 763         struct se_port *l_port,
 764         struct se_node_acl *nacl,
 765         unsigned char *md_buf,
 766         int new_state,
 767         int explict)
 768 {
 769         struct se_dev_entry *se_deve;
 770         struct se_lun_acl *lacl;
 771         struct se_port *port;
 772         struct t10_alua_tg_pt_gp_member *mem;
 773         int old_state = 0;
 774         /*
 775          * Save the old primary ALUA access state, and set the current state
 776          * to ALUA_ACCESS_STATE_TRANSITION.
 777          */
 778         old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 779         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
 780                         ALUA_ACCESS_STATE_TRANSITION);
 781         tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
 782                                 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
 783                                 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
 784         /*
 785          * Check for the optional ALUA primary state transition delay
 786          */
 787         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
 788                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
 789
 790         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 791         list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
 792                                 tg_pt_gp_mem_list) {
 793                 port = mem->tg_pt;
 794                 /*
 795                  * After an implicit target port asymmetric access state
 796                  * change, a device server shall establish a unit attention
 797                  * condition for the initiator port associated with every I_T
 798                  * nexus with the additional sense code set to ASYMMETRIC
 799                  * ACCESS STATE CHAGED.
 800                  *
 801                  * After an explicit target port asymmetric access state
 802                  * change, a device server shall establish a unit attention
 803                  * condition with the additional sense code set to ASYMMETRIC
 804                  * ACCESS STATE CHANGED for the initiator port associated with
 805                  * every I_T nexus other than the I_T nexus on which the SET
 806                  * TARGET PORT GROUPS command
 807                  */
 808                 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
 809                 smp_mb__after_atomic_inc();
 810                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 811
 812                 spin_lock_bh(&port->sep_alua_lock);
 813                 list_for_each_entry(se_deve, &port->sep_alua_list,
 814                                         alua_port_list) {
 815                         lacl = se_deve->se_lun_acl;
 816                         /*
 817                          * se_deve->se_lun_acl pointer may be NULL for a
 818                          * entry created without explict Node+MappedLUN ACLs
 819                          */
 820                         if (!lacl)
 821                                 continue;
 822
 823                         if (explict &&
 824                            (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
 825                            (l_port != NULL) && (l_port == port))
 826                                 continue;
 827
 828                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
 829                                 se_deve->mapped_lun, 0x2A,
 830                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
 831                 }
 832                 spin_unlock_bh(&port->sep_alua_lock);
 833
 834                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 835                 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
 836                 smp_mb__after_atomic_dec();
 837         }
 838         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 839         /*
 840          * Update the ALUA metadata buf that has been allocated in
 841          * core_alua_do_port_transition(), this metadata will be written
 842          * to struct file.
 843          *
 844          * Note that there is the case where we do not want to update the
 845          * metadata when the saved metadata is being parsed in userspace
 846          * when setting the existing port access state and access status.
 847          *
 848          * Also note that the failure to write out the ALUA metadata to
 849          * struct file does NOT affect the actual ALUA transition.
 850          */
 851         if (tg_pt_gp->tg_pt_gp_write_metadata) {
 852                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
 853                 core_alua_update_tpg_primary_metadata(tg_pt_gp,
 854                                         new_state, md_buf);
 855                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
 856         }
 857         /*
 858          * Set the current primary ALUA access state to the requested new state
 859          */
 860         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
 861
 862         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
 863                 " from primary access state %s to %s\n", (explict) ? "explict" :
 864                 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
 865                 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
 866                 core_alua_dump_state(new_state));
 867
 868         return 0;
 869 }
 870
 871 int core_alua_do_port_transition(
 872         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
 873         struct se_device *l_dev,
 874         struct se_port *l_port,
 875         struct se_node_acl *l_nacl,
 876         int new_state,
 877         int explict)
 878 {
 879         struct se_device *dev;
 880         struct se_port *port;
 881         struct se_node_acl *nacl;
 882         struct t10_alua_lu_gp *lu_gp;
 883         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
 884         struct t10_alua_tg_pt_gp *tg_pt_gp;
 885         unsigned char *md_buf;
 886         int primary;
 887
 888         if (core_alua_check_transition(new_state, &primary) != 0)
 889                 return -EINVAL;
 890
 891         md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
 892         if (!md_buf) {
 893                 pr_err("Unable to allocate buf for ALUA metadata\n");
 894                 return -ENOMEM;
 895         }
 896
 897         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
 898         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
 899         lu_gp = local_lu_gp_mem->lu_gp;
 900         atomic_inc(&lu_gp->lu_gp_ref_cnt);
 901         smp_mb__after_atomic_inc();
 902         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
 903         /*
 904          * For storage objects that are members of the 'default_lu_gp',
 905          * we only do transition on the passed *l_tp_pt_gp, and not
 906          * on all of the matching target port groups IDs in default_lu_gp.
 907          */
 908         if (!lu_gp->lu_gp_id) {
 909                 /*
 910                  * core_alua_do_transition_tg_pt() will always return
 911                  * success.
 912                  */
 913                 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
 914                                         md_buf, new_state, explict);
 915                 atomic_dec(&lu_gp->lu_gp_ref_cnt);
 916                 smp_mb__after_atomic_dec();
 917                 kfree(md_buf);
 918                 return 0;
 919         }
 920         /*
 921          * For all other LU groups aside from 'default_lu_gp', walk all of
 922          * the associated storage objects looking for a matching target port
 923          * group ID from the local target port group.
 924          */
 925         spin_lock(&lu_gp->lu_gp_lock);
 926         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
 927                                 lu_gp_mem_list) {
 928
 929                 dev = lu_gp_mem->lu_gp_mem_dev;
 930                 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
 931                 smp_mb__after_atomic_inc();
 932                 spin_unlock(&lu_gp->lu_gp_lock);
 933
 934                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 935                 list_for_each_entry(tg_pt_gp,
 936                                 &dev->t10_alua.tg_pt_gps_list,
 937                                 tg_pt_gp_list) {
 938
 939                         if (!tg_pt_gp->tg_pt_gp_valid_id)
 940                                 continue;
 941                         /*
 942                          * If the target behavior port asymmetric access state
 943                          * is changed for any target port group accessiable via
 944                          * a logical unit within a LU group, the target port
 945                          * behavior group asymmetric access states for the same
 946                          * target port group accessible via other logical units
 947                          * in that LU group will also change.
 948                          */
 949                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
 950                                 continue;
 951
 952                         if (l_tg_pt_gp == tg_pt_gp) {
 953                                 port = l_port;
 954                                 nacl = l_nacl;
 955                         } else {
 956                                 port = NULL;
 957                                 nacl = NULL;
 958                         }
 959                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
 960                         smp_mb__after_atomic_inc();
 961                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 962                         /*
 963                          * core_alua_do_transition_tg_pt() will always return
 964                          * success.
 965                          */
 966                         core_alua_do_transition_tg_pt(tg_pt_gp, port,
 967                                         nacl, md_buf, new_state, explict);
 968
 969                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 970                         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
 971                         smp_mb__after_atomic_dec();
 972                 }
 973                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 974
 975                 spin_lock(&lu_gp->lu_gp_lock);
 976                 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
 977                 smp_mb__after_atomic_dec();
 978         }
 979         spin_unlock(&lu_gp->lu_gp_lock);
 980
 981         pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
 982                 " Group IDs: %hu %s transition to primary state: %s\n",
 983                 config_item_name(&lu_gp->lu_gp_group.cg_item),
 984                 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
 985                 core_alua_dump_state(new_state));
 986
 987         atomic_dec(&lu_gp->lu_gp_ref_cnt);
 988         smp_mb__after_atomic_dec();
 989         kfree(md_buf);
 990         return 0;
 991 }
 992
 993 /*
 994  * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
 995  */
 996 static int core_alua_update_tpg_secondary_metadata(
 997         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
 998         struct se_port *port,
 999         unsigned char *md_buf,
1000         u32 md_buf_len)
1001 {
1002         struct se_portal_group *se_tpg = port->sep_tpg;
1003         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1004         int len;
1005
1006         memset(path, 0, ALUA_METADATA_PATH_LEN);
1007         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1008
1009         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1010                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1011
1012         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1013                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1014                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1015
1016         len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
1017                         "alua_tg_pt_status=0x%02x\n",
1018                         atomic_read(&port->sep_tg_pt_secondary_offline),
1019                         port->sep_tg_pt_secondary_stat);
1020
1021         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1022                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1023                         port->sep_lun->unpacked_lun);
1024
1025         return core_alua_write_tpg_metadata(path, md_buf, len);
1026 }
1027
1028 static int core_alua_set_tg_pt_secondary_state(
1029         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1030         struct se_port *port,
1031         int explict,
1032         int offline)
1033 {
1034         struct t10_alua_tg_pt_gp *tg_pt_gp;
1035         unsigned char *md_buf;
1036         u32 md_buf_len;
1037         int trans_delay_msecs;
1038
1039         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1040         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1041         if (!tg_pt_gp) {
1042                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1043                 pr_err("Unable to complete secondary state"
1044                                 " transition\n");
1045                 return -EINVAL;
1046         }
1047         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1048         /*
1049          * Set the secondary ALUA target port access state to OFFLINE
1050          * or release the previously secondary state for struct se_port
1051          */
1052         if (offline)
1053                 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1054         else
1055                 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1056
1057         md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1058         port->sep_tg_pt_secondary_stat = (explict) ?
1059                         ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1060                         ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1061
1062         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1063                 " to secondary access state: %s\n", (explict) ? "explict" :
1064                 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1065                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1066
1067         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1068         /*
1069          * Do the optional transition delay after we set the secondary
1070          * ALUA access state.
1071          */
1072         if (trans_delay_msecs != 0)
1073                 msleep_interruptible(trans_delay_msecs);
1074         /*
1075          * See if we need to update the ALUA fabric port metadata for
1076          * secondary state and status
1077          */
1078         if (port->sep_tg_pt_secondary_write_md) {
1079                 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
1080                 if (!md_buf) {
1081                         pr_err("Unable to allocate md_buf for"
1082                                 " secondary ALUA access metadata\n");
1083                         return -ENOMEM;
1084                 }
1085                 mutex_lock(&port->sep_tg_pt_md_mutex);
1086                 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1087                                 md_buf, md_buf_len);
1088                 mutex_unlock(&port->sep_tg_pt_md_mutex);
1089
1090                 kfree(md_buf);
1091         }
1092
1093         return 0;
1094 }
1095
1096 struct t10_alua_lu_gp *
1097 core_alua_allocate_lu_gp(const char *name, int def_group)
1098 {
1099         struct t10_alua_lu_gp *lu_gp;
1100
1101         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1102         if (!lu_gp) {
1103                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1104                 return ERR_PTR(-ENOMEM);
1105         }
1106         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1107         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1108         spin_lock_init(&lu_gp->lu_gp_lock);
1109         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1110
1111         if (def_group) {
1112                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1113                 lu_gp->lu_gp_valid_id = 1;
1114                 alua_lu_gps_count++;
1115         }
1116
1117         return lu_gp;
1118 }
1119
1120 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1121 {
1122         struct t10_alua_lu_gp *lu_gp_tmp;
1123         u16 lu_gp_id_tmp;
1124         /*
1125          * The lu_gp->lu_gp_id may only be set once..
1126          */
1127         if (lu_gp->lu_gp_valid_id) {
1128                 pr_warn("ALUA LU Group already has a valid ID,"
1129                         " ignoring request\n");
1130                 return -EINVAL;
1131         }
1132
1133         spin_lock(&lu_gps_lock);
1134         if (alua_lu_gps_count == 0x0000ffff) {
1135                 pr_err("Maximum ALUA alua_lu_gps_count:"
1136                                 " 0x0000ffff reached\n");
1137                 spin_unlock(&lu_gps_lock);
1138                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1139                 return -ENOSPC;
1140         }
1141 again:
1142         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1143                                 alua_lu_gps_counter++;
1144
1145         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1146                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1147                         if (!lu_gp_id)
1148                                 goto again;
1149
1150                         pr_warn("ALUA Logical Unit Group ID: %hu"
1151                                 " already exists, ignoring request\n",
1152                                 lu_gp_id);
1153                         spin_unlock(&lu_gps_lock);
1154                         return -EINVAL;
1155                 }
1156         }
1157
1158         lu_gp->lu_gp_id = lu_gp_id_tmp;
1159         lu_gp->lu_gp_valid_id = 1;
1160         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1161         alua_lu_gps_count++;
1162         spin_unlock(&lu_gps_lock);
1163
1164         return 0;
1165 }
1166
1167 static struct t10_alua_lu_gp_member *
1168 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1169 {
1170         struct t10_alua_lu_gp_member *lu_gp_mem;
1171
1172         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1173         if (!lu_gp_mem) {
1174                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1175                 return ERR_PTR(-ENOMEM);
1176         }
1177         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1178         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1179         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1180
1181         lu_gp_mem->lu_gp_mem_dev = dev;
1182         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1183
1184         return lu_gp_mem;
1185 }
1186
1187 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1188 {
1189         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1190         /*
1191          * Once we have reached this point, config_item_put() has
1192          * already been called from target_core_alua_drop_lu_gp().
1193          *
1194          * Here, we remove the *lu_gp from the global list so that
1195          * no associations can be made while we are releasing
1196          * struct t10_alua_lu_gp.
1197          */
1198         spin_lock(&lu_gps_lock);
1199         list_del(&lu_gp->lu_gp_node);
1200         alua_lu_gps_count--;
1201         spin_unlock(&lu_gps_lock);
1202         /*
1203          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1204          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1205          * released with core_alua_put_lu_gp_from_name()
1206          */
1207         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1208                 cpu_relax();
1209         /*
1210          * Release reference to struct t10_alua_lu_gp * from all associated
1211          * struct se_device.
1212          */
1213         spin_lock(&lu_gp->lu_gp_lock);
1214         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1215                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1216                 if (lu_gp_mem->lu_gp_assoc) {
1217                         list_del(&lu_gp_mem->lu_gp_mem_list);
1218                         lu_gp->lu_gp_members--;
1219                         lu_gp_mem->lu_gp_assoc = 0;
1220                 }
1221                 spin_unlock(&lu_gp->lu_gp_lock);
1222                 /*
1223                  *
1224                  * lu_gp_mem is associated with a single
1225                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1226                  * struct se_device is released via core_alua_free_lu_gp_mem().
1227                  *
1228                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1229                  * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1230                  */
1231                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1232                 if (lu_gp != default_lu_gp)
1233                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1234                                         default_lu_gp);
1235                 else
1236                         lu_gp_mem->lu_gp = NULL;
1237                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1238
1239                 spin_lock(&lu_gp->lu_gp_lock);
1240         }
1241         spin_unlock(&lu_gp->lu_gp_lock);
1242
1243         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1244 }
1245
1246 void core_alua_free_lu_gp_mem(struct se_device *dev)
1247 {
1248         struct t10_alua_lu_gp *lu_gp;
1249         struct t10_alua_lu_gp_member *lu_gp_mem;
1250
1251         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1252         if (!lu_gp_mem)
1253                 return;
1254
1255         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1256                 cpu_relax();
1257
1258         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1259         lu_gp = lu_gp_mem->lu_gp;
1260         if (lu_gp) {
1261                 spin_lock(&lu_gp->lu_gp_lock);
1262                 if (lu_gp_mem->lu_gp_assoc) {
1263                         list_del(&lu_gp_mem->lu_gp_mem_list);
1264                         lu_gp->lu_gp_members--;
1265                         lu_gp_mem->lu_gp_assoc = 0;
1266                 }
1267                 spin_unlock(&lu_gp->lu_gp_lock);
1268                 lu_gp_mem->lu_gp = NULL;
1269         }
1270         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1271
1272         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1273 }
1274
1275 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1276 {
1277         struct t10_alua_lu_gp *lu_gp;
1278         struct config_item *ci;
1279
1280         spin_lock(&lu_gps_lock);
1281         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1282                 if (!lu_gp->lu_gp_valid_id)
1283                         continue;
1284                 ci = &lu_gp->lu_gp_group.cg_item;
1285                 if (!strcmp(config_item_name(ci), name)) {
1286                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1287                         spin_unlock(&lu_gps_lock);
1288                         return lu_gp;
1289                 }
1290         }
1291         spin_unlock(&lu_gps_lock);
1292
1293         return NULL;
1294 }
1295
1296 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1297 {
1298         spin_lock(&lu_gps_lock);
1299         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1300         spin_unlock(&lu_gps_lock);
1301 }
1302
1303 /*
1304  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1305  */
1306 void __core_alua_attach_lu_gp_mem(
1307         struct t10_alua_lu_gp_member *lu_gp_mem,
1308         struct t10_alua_lu_gp *lu_gp)
1309 {
1310         spin_lock(&lu_gp->lu_gp_lock);
1311         lu_gp_mem->lu_gp = lu_gp;
1312         lu_gp_mem->lu_gp_assoc = 1;
1313         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1314         lu_gp->lu_gp_members++;
1315         spin_unlock(&lu_gp->lu_gp_lock);
1316 }
1317
1318 /*
1319  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1320  */
1321 void __core_alua_drop_lu_gp_mem(
1322         struct t10_alua_lu_gp_member *lu_gp_mem,
1323         struct t10_alua_lu_gp *lu_gp)
1324 {
1325         spin_lock(&lu_gp->lu_gp_lock);
1326         list_del(&lu_gp_mem->lu_gp_mem_list);
1327         lu_gp_mem->lu_gp = NULL;
1328         lu_gp_mem->lu_gp_assoc = 0;
1329         lu_gp->lu_gp_members--;
1330         spin_unlock(&lu_gp->lu_gp_lock);
1331 }
1332
1333 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1334                 const char *name, int def_group)
1335 {
1336         struct t10_alua_tg_pt_gp *tg_pt_gp;
1337
1338         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1339         if (!tg_pt_gp) {
1340                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1341                 return NULL;
1342         }
1343         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1344         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1345         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1346         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1347         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1348         tg_pt_gp->tg_pt_gp_dev = dev;
1349         tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1350         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1351                 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1352         /*
1353          * Enable both explict and implict ALUA support by default
1354          */
1355         tg_pt_gp->tg_pt_gp_alua_access_type =
1356                         TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1357         /*
1358          * Set the default Active/NonOptimized Delay in milliseconds
1359          */
1360         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1361         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1362         tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
1363
1364         if (def_group) {
1365                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1366                 tg_pt_gp->tg_pt_gp_id =
1367                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1368                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1369                 dev->t10_alua.alua_tg_pt_gps_count++;
1370                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1371                               &dev->t10_alua.tg_pt_gps_list);
1372                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1373         }
1374
1375         return tg_pt_gp;
1376 }
1377
1378 int core_alua_set_tg_pt_gp_id(
1379         struct t10_alua_tg_pt_gp *tg_pt_gp,
1380         u16 tg_pt_gp_id)
1381 {
1382         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1383         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1384         u16 tg_pt_gp_id_tmp;
1385
1386         /*
1387          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1388          */
1389         if (tg_pt_gp->tg_pt_gp_valid_id) {
1390                 pr_warn("ALUA TG PT Group already has a valid ID,"
1391                         " ignoring request\n");
1392                 return -EINVAL;
1393         }
1394
1395         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1396         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1397                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1398                         " 0x0000ffff reached\n");
1399                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1400                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1401                 return -ENOSPC;
1402         }
1403 again:
1404         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1405                         dev->t10_alua.alua_tg_pt_gps_counter++;
1406
1407         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1408                         tg_pt_gp_list) {
1409                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1410                         if (!tg_pt_gp_id)
1411                                 goto again;
1412
1413                         pr_err("ALUA Target Port Group ID: %hu already"
1414                                 " exists, ignoring request\n", tg_pt_gp_id);
1415                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1416                         return -EINVAL;
1417                 }
1418         }
1419
1420         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1421         tg_pt_gp->tg_pt_gp_valid_id = 1;
1422         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1423                         &dev->t10_alua.tg_pt_gps_list);
1424         dev->t10_alua.alua_tg_pt_gps_count++;
1425         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1426
1427         return 0;
1428 }
1429
1430 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1431         struct se_port *port)
1432 {
1433         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1434
1435         tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1436                                 GFP_KERNEL);
1437         if (!tg_pt_gp_mem) {
1438                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1439                 return ERR_PTR(-ENOMEM);
1440         }
1441         INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1442         spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1443         atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1444
1445         tg_pt_gp_mem->tg_pt = port;
1446         port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1447
1448         return tg_pt_gp_mem;
1449 }
1450
1451 void core_alua_free_tg_pt_gp(
1452         struct t10_alua_tg_pt_gp *tg_pt_gp)
1453 {
1454         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1455         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1456
1457         /*
1458          * Once we have reached this point, config_item_put() has already
1459          * been called from target_core_alua_drop_tg_pt_gp().
1460          *
1461          * Here we remove *tg_pt_gp from the global list so that
1462          * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1463          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1464          */
1465         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1466         list_del(&tg_pt_gp->tg_pt_gp_list);
1467         dev->t10_alua.alua_tg_pt_gps_counter--;
1468         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1469
1470         /*
1471          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1472          * core_alua_get_tg_pt_gp_by_name() in
1473          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1474          * to be released with core_alua_put_tg_pt_gp_from_name().
1475          */
1476         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1477                 cpu_relax();
1478
1479         /*
1480          * Release reference to struct t10_alua_tg_pt_gp from all associated
1481          * struct se_port.
1482          */
1483         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1484         list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1485                         &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1486                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1487                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1488                         tg_pt_gp->tg_pt_gp_members--;
1489                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1490                 }
1491                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1492                 /*
1493                  * tg_pt_gp_mem is associated with a single
1494                  * se_port->sep_alua_tg_pt_gp_mem, and is released via
1495                  * core_alua_free_tg_pt_gp_mem().
1496                  *
1497                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1498                  * assume we want to re-assocate a given tg_pt_gp_mem with
1499                  * default_tg_pt_gp.
1500                  */
1501                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1502                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1503                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1504                                         dev->t10_alua.default_tg_pt_gp);
1505                 } else
1506                         tg_pt_gp_mem->tg_pt_gp = NULL;
1507                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1508
1509                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1510         }
1511         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1512
1513         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1514 }
1515
1516 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1517 {
1518         struct t10_alua_tg_pt_gp *tg_pt_gp;
1519         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1520
1521         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1522         if (!tg_pt_gp_mem)
1523                 return;
1524
1525         while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1526                 cpu_relax();
1527
1528         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1529         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1530         if (tg_pt_gp) {
1531                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1532                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1533                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1534                         tg_pt_gp->tg_pt_gp_members--;
1535                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1536                 }
1537                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1538                 tg_pt_gp_mem->tg_pt_gp = NULL;
1539         }
1540         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1541
1542         kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1543 }
1544
1545 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1546                 struct se_device *dev, const char *name)
1547 {
1548         struct t10_alua_tg_pt_gp *tg_pt_gp;
1549         struct config_item *ci;
1550
1551         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1552         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1553                         tg_pt_gp_list) {
1554                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1555                         continue;
1556                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1557                 if (!strcmp(config_item_name(ci), name)) {
1558                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1559                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1560                         return tg_pt_gp;
1561                 }
1562         }
1563         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1564
1565         return NULL;
1566 }
1567
1568 static void core_alua_put_tg_pt_gp_from_name(
1569         struct t10_alua_tg_pt_gp *tg_pt_gp)
1570 {
1571         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1572
1573         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1574         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1575         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1576 }
1577
1578 /*
1579  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1580  */
1581 void __core_alua_attach_tg_pt_gp_mem(
1582         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1583         struct t10_alua_tg_pt_gp *tg_pt_gp)
1584 {
1585         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1586         tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1587         tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1588         list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1589                         &tg_pt_gp->tg_pt_gp_mem_list);
1590         tg_pt_gp->tg_pt_gp_members++;
1591         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1592 }
1593
1594 /*
1595  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1596  */
1597 static void __core_alua_drop_tg_pt_gp_mem(
1598         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1599         struct t10_alua_tg_pt_gp *tg_pt_gp)
1600 {
1601         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1602         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1603         tg_pt_gp_mem->tg_pt_gp = NULL;
1604         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1605         tg_pt_gp->tg_pt_gp_members--;
1606         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1607 }
1608
1609 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1610 {
1611         struct config_item *tg_pt_ci;
1612         struct t10_alua_tg_pt_gp *tg_pt_gp;
1613         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1614         ssize_t len = 0;
1615
1616         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1617         if (!tg_pt_gp_mem)
1618                 return len;
1619
1620         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1621         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1622         if (tg_pt_gp) {
1623                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1624                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1625                         " %hu\nTG Port Primary Access State: %s\nTG Port "
1626                         "Primary Access Status: %s\nTG Port Secondary Access"
1627                         " State: %s\nTG Port Secondary Access Status: %s\n",
1628                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1629                         core_alua_dump_state(atomic_read(
1630                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
1631                         core_alua_dump_status(
1632                                 tg_pt_gp->tg_pt_gp_alua_access_status),
1633                         (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1634                         "Offline" : "None",
1635                         core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1636         }
1637         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1638
1639         return len;
1640 }
1641
1642 ssize_t core_alua_store_tg_pt_gp_info(
1643         struct se_port *port,
1644         const char *page,
1645         size_t count)
1646 {
1647         struct se_portal_group *tpg;
1648         struct se_lun *lun;
1649         struct se_device *dev = port->sep_lun->lun_se_dev;
1650         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1651         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1652         unsigned char buf[TG_PT_GROUP_NAME_BUF];
1653         int move = 0;
1654
1655         tpg = port->sep_tpg;
1656         lun = port->sep_lun;
1657
1658         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1659         if (!tg_pt_gp_mem)
1660                 return 0;
1661
1662         if (count > TG_PT_GROUP_NAME_BUF) {
1663                 pr_err("ALUA Target Port Group alias too large!\n");
1664                 return -EINVAL;
1665         }
1666         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1667         memcpy(buf, page, count);
1668         /*
1669          * Any ALUA target port group alias besides "NULL" means we will be
1670          * making a new group association.
1671          */
1672         if (strcmp(strstrip(buf), "NULL")) {
1673                 /*
1674                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
1675                  * struct t10_alua_tg_pt_gp.  This reference is released with
1676                  * core_alua_put_tg_pt_gp_from_name() below.
1677                  */
1678                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1679                                         strstrip(buf));
1680                 if (!tg_pt_gp_new)
1681                         return -ENODEV;
1682         }
1683
1684         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1685         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1686         if (tg_pt_gp) {
1687                 /*
1688                  * Clearing an existing tg_pt_gp association, and replacing
1689                  * with the default_tg_pt_gp.
1690                  */
1691                 if (!tg_pt_gp_new) {
1692                         pr_debug("Target_Core_ConfigFS: Moving"
1693                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1694                                 " alua/%s, ID: %hu back to"
1695                                 " default_tg_pt_gp\n",
1696                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1697                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1698                                 config_item_name(&lun->lun_group.cg_item),
1699                                 config_item_name(
1700                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
1701                                 tg_pt_gp->tg_pt_gp_id);
1702
1703                         __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1704                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1705                                         dev->t10_alua.default_tg_pt_gp);
1706                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1707
1708                         return count;
1709                 }
1710                 /*
1711                  * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1712                  */
1713                 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1714                 move = 1;
1715         }
1716         /*
1717          * Associate tg_pt_gp_mem with tg_pt_gp_new.
1718          */
1719         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1720         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1721         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1722                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1723                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1724                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1725                 config_item_name(&lun->lun_group.cg_item),
1726                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1727                 tg_pt_gp_new->tg_pt_gp_id);
1728
1729         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1730         return count;
1731 }
1732
1733 ssize_t core_alua_show_access_type(
1734         struct t10_alua_tg_pt_gp *tg_pt_gp,
1735         char *page)
1736 {
1737         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1738             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1739                 return sprintf(page, "Implict and Explict\n");
1740         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1741                 return sprintf(page, "Implict\n");
1742         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1743                 return sprintf(page, "Explict\n");
1744         else
1745                 return sprintf(page, "None\n");
1746 }
1747
1748 ssize_t core_alua_store_access_type(
1749         struct t10_alua_tg_pt_gp *tg_pt_gp,
1750         const char *page,
1751         size_t count)
1752 {
1753         unsigned long tmp;
1754         int ret;
1755
1756         ret = strict_strtoul(page, 0, &tmp);
1757         if (ret < 0) {
1758                 pr_err("Unable to extract alua_access_type\n");
1759                 return -EINVAL;
1760         }
1761         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
1762                 pr_err("Illegal value for alua_access_type:"
1763                                 " %lu\n", tmp);
1764                 return -EINVAL;
1765         }
1766         if (tmp == 3)
1767                 tg_pt_gp->tg_pt_gp_alua_access_type =
1768                         TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1769         else if (tmp == 2)
1770                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1771         else if (tmp == 1)
1772                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1773         else
1774                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1775
1776         return count;
1777 }
1778
1779 ssize_t core_alua_show_nonop_delay_msecs(
1780         struct t10_alua_tg_pt_gp *tg_pt_gp,
1781         char *page)
1782 {
1783         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1784 }
1785
1786 ssize_t core_alua_store_nonop_delay_msecs(
1787         struct t10_alua_tg_pt_gp *tg_pt_gp,
1788         const char *page,
1789         size_t count)
1790 {
1791         unsigned long tmp;
1792         int ret;
1793
1794         ret = strict_strtoul(page, 0, &tmp);
1795         if (ret < 0) {
1796                 pr_err("Unable to extract nonop_delay_msecs\n");
1797                 return -EINVAL;
1798         }
1799         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
1800                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1801                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1802                         ALUA_MAX_NONOP_DELAY_MSECS);
1803                 return -EINVAL;
1804         }
1805         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1806
1807         return count;
1808 }
1809
1810 ssize_t core_alua_show_trans_delay_msecs(
1811         struct t10_alua_tg_pt_gp *tg_pt_gp,
1812         char *page)
1813 {
1814         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1815 }
1816
1817 ssize_t core_alua_store_trans_delay_msecs(
1818         struct t10_alua_tg_pt_gp *tg_pt_gp,
1819         const char *page,
1820         size_t count)
1821 {
1822         unsigned long tmp;
1823         int ret;
1824
1825         ret = strict_strtoul(page, 0, &tmp);
1826         if (ret < 0) {
1827                 pr_err("Unable to extract trans_delay_msecs\n");
1828                 return -EINVAL;
1829         }
1830         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
1831                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1832                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1833                         ALUA_MAX_TRANS_DELAY_MSECS);
1834                 return -EINVAL;
1835         }
1836         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1837
1838         return count;
1839 }
1840
1841 ssize_t core_alua_show_implict_trans_secs(
1842         struct t10_alua_tg_pt_gp *tg_pt_gp,
1843         char *page)
1844 {
1845         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
1846 }
1847
1848 ssize_t core_alua_store_implict_trans_secs(
1849         struct t10_alua_tg_pt_gp *tg_pt_gp,
1850         const char *page,
1851         size_t count)
1852 {
1853         unsigned long tmp;
1854         int ret;
1855
1856         ret = strict_strtoul(page, 0, &tmp);
1857         if (ret < 0) {
1858                 pr_err("Unable to extract implict_trans_secs\n");
1859                 return -EINVAL;
1860         }
1861         if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
1862                 pr_err("Passed implict_trans_secs: %lu, exceeds"
1863                         " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
1864                         ALUA_MAX_IMPLICT_TRANS_SECS);
1865                 return  -EINVAL;
1866         }
1867         tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
1868
1869         return count;
1870 }
1871
1872 ssize_t core_alua_show_preferred_bit(
1873         struct t10_alua_tg_pt_gp *tg_pt_gp,
1874         char *page)
1875 {
1876         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1877 }
1878
1879 ssize_t core_alua_store_preferred_bit(
1880         struct t10_alua_tg_pt_gp *tg_pt_gp,
1881         const char *page,
1882         size_t count)
1883 {
1884         unsigned long tmp;
1885         int ret;
1886
1887         ret = strict_strtoul(page, 0, &tmp);
1888         if (ret < 0) {
1889                 pr_err("Unable to extract preferred ALUA value\n");
1890                 return -EINVAL;
1891         }
1892         if ((tmp != 0) && (tmp != 1)) {
1893                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
1894                 return -EINVAL;
1895         }
1896         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1897
1898         return count;
1899 }
1900
1901 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1902 {
1903         if (!lun->lun_sep)
1904                 return -ENODEV;
1905
1906         return sprintf(page, "%d\n",
1907                 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1908 }
1909
1910 ssize_t core_alua_store_offline_bit(
1911         struct se_lun *lun,
1912         const char *page,
1913         size_t count)
1914 {
1915         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1916         unsigned long tmp;
1917         int ret;
1918
1919         if (!lun->lun_sep)
1920                 return -ENODEV;
1921
1922         ret = strict_strtoul(page, 0, &tmp);
1923         if (ret < 0) {
1924                 pr_err("Unable to extract alua_tg_pt_offline value\n");
1925                 return -EINVAL;
1926         }
1927         if ((tmp != 0) && (tmp != 1)) {
1928                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1929                                 tmp);
1930                 return -EINVAL;
1931         }
1932         tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
1933         if (!tg_pt_gp_mem) {
1934                 pr_err("Unable to locate *tg_pt_gp_mem\n");
1935                 return -EINVAL;
1936         }
1937
1938         ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1939                         lun->lun_sep, 0, (int)tmp);
1940         if (ret < 0)
1941                 return -EINVAL;
1942
1943         return count;
1944 }
1945
1946 ssize_t core_alua_show_secondary_status(
1947         struct se_lun *lun,
1948         char *page)
1949 {
1950         return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1951 }
1952
1953 ssize_t core_alua_store_secondary_status(
1954         struct se_lun *lun,
1955         const char *page,
1956         size_t count)
1957 {
1958         unsigned long tmp;
1959         int ret;
1960
1961         ret = strict_strtoul(page, 0, &tmp);
1962         if (ret < 0) {
1963                 pr_err("Unable to extract alua_tg_pt_status\n");
1964                 return -EINVAL;
1965         }
1966         if ((tmp != ALUA_STATUS_NONE) &&
1967             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
1968             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
1969                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1970                                 tmp);
1971                 return -EINVAL;
1972         }
1973         lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
1974
1975         return count;
1976 }
1977
1978 ssize_t core_alua_show_secondary_write_metadata(
1979         struct se_lun *lun,
1980         char *page)
1981 {
1982         return sprintf(page, "%d\n",
1983                         lun->lun_sep->sep_tg_pt_secondary_write_md);
1984 }
1985
1986 ssize_t core_alua_store_secondary_write_metadata(
1987         struct se_lun *lun,
1988         const char *page,
1989         size_t count)
1990 {
1991         unsigned long tmp;
1992         int ret;
1993
1994         ret = strict_strtoul(page, 0, &tmp);
1995         if (ret < 0) {
1996                 pr_err("Unable to extract alua_tg_pt_write_md\n");
1997                 return -EINVAL;
1998         }
1999         if ((tmp != 0) && (tmp != 1)) {
2000                 pr_err("Illegal value for alua_tg_pt_write_md:"
2001                                 " %lu\n", tmp);
2002                 return -EINVAL;
2003         }
2004         lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2005
2006         return count;
2007 }
2008
2009 int core_setup_alua(struct se_device *dev)
2010 {
2011         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2012             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2013                 struct t10_alua_lu_gp_member *lu_gp_mem;
2014
2015                 /*
2016                  * Associate this struct se_device with the default ALUA
2017                  * LUN Group.
2018                  */
2019                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2020                 if (IS_ERR(lu_gp_mem))
2021                         return PTR_ERR(lu_gp_mem);
2022
2023                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2024                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2025                                 default_lu_gp);
2026                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2027
2028                 pr_debug("%s: Adding to default ALUA LU Group:"
2029                         " core/alua/lu_gps/default_lu_gp\n",
2030                         dev->transport->name);
2031         }
2032
2033         return 0;
2034 }