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 *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                 return 0;
 413         case MAINTENANCE_IN:
 414                 switch (cdb[1] & 0x1f) {
 415                 case MI_REPORT_TARGET_PGS:
 416                         return 0;
 417                 default:
 418                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 419                         return 1;
 420                 }
 421         case MAINTENANCE_OUT:
 422                 switch (cdb[1]) {
 423                 case MO_SET_TARGET_PGS:
 424                         return 0;
 425                 default:
 426                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 427                         return 1;
 428                 }
 429         case REQUEST_SENSE:
 430         case PERSISTENT_RESERVE_IN:
 431         case PERSISTENT_RESERVE_OUT:
 432         case READ_BUFFER:
 433         case WRITE_BUFFER:
 434                 return 0;
 435         default:
 436                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
 437                 return 1;
 438         }
 439
 440         return 0;
 441 }
 442
 443 static inline int core_alua_state_unavailable(
 444         struct se_cmd *cmd,
 445         unsigned char *cdb,
 446         u8 *alua_ascq)
 447 {
 448         /*
 449          * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
 450          * spc4r17 section 5.9.2.4.5
 451          */
 452         switch (cdb[0]) {
 453         case INQUIRY:
 454         case REPORT_LUNS:
 455                 return 0;
 456         case MAINTENANCE_IN:
 457                 switch (cdb[1] & 0x1f) {
 458                 case MI_REPORT_TARGET_PGS:
 459                         return 0;
 460                 default:
 461                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 462                         return 1;
 463                 }
 464         case MAINTENANCE_OUT:
 465                 switch (cdb[1]) {
 466                 case MO_SET_TARGET_PGS:
 467                         return 0;
 468                 default:
 469                         *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 470                         return 1;
 471                 }
 472         case REQUEST_SENSE:
 473         case READ_BUFFER:
 474         case WRITE_BUFFER:
 475                 return 0;
 476         default:
 477                 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
 478                 return 1;
 479         }
 480
 481         return 0;
 482 }
 483
 484 static inline int core_alua_state_transition(
 485         struct se_cmd *cmd,
 486         unsigned char *cdb,
 487         u8 *alua_ascq)
 488 {
 489         /*
 490          * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
 491          * spc4r17 section 5.9.2.5
 492          */
 493         switch (cdb[0]) {
 494         case INQUIRY:
 495         case REPORT_LUNS:
 496                 return 0;
 497         case MAINTENANCE_IN:
 498                 switch (cdb[1] & 0x1f) {
 499                 case MI_REPORT_TARGET_PGS:
 500                         return 0;
 501                 default:
 502                         *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 503                         return 1;
 504                 }
 505         case REQUEST_SENSE:
 506         case READ_BUFFER:
 507         case WRITE_BUFFER:
 508                 return 0;
 509         default:
 510                 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
 511                 return 1;
 512         }
 513
 514         return 0;
 515 }
 516
 517 /*
 518  * return 1: Is used to signal LUN not accecsable, and check condition/not ready
 519  * return 0: Used to signal success
 520  * reutrn -1: Used to signal failure, and invalid cdb field
 521  */
 522 sense_reason_t
 523 target_alua_state_check(struct se_cmd *cmd)
 524 {
 525         struct se_device *dev = cmd->se_dev;
 526         unsigned char *cdb = cmd->t_task_cdb;
 527         struct se_lun *lun = cmd->se_lun;
 528         struct se_port *port = lun->lun_sep;
 529         struct t10_alua_tg_pt_gp *tg_pt_gp;
 530         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 531         int out_alua_state, nonop_delay_msecs;
 532         u8 alua_ascq;
 533         int ret;
 534
 535         if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
 536                 return 0;
 537         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
 538                 return 0;
 539
 540         if (!port)
 541                 return 0;
 542         /*
 543          * First, check for a struct se_port specific secondary ALUA target port
 544          * access state: OFFLINE
 545          */
 546         if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
 547                 pr_debug("ALUA: Got secondary offline status for local"
 548                                 " target port\n");
 549                 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
 550                 ret = 1;
 551                 goto out;
 552         }
 553          /*
 554          * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
 555          * ALUA target port group, to obtain current ALUA access state.
 556          * Otherwise look for the underlying struct se_device association with
 557          * a ALUA logical unit group.
 558          */
 559         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 560         if (!tg_pt_gp_mem)
 561                 return 0;
 562
 563         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 564         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 565         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 566         nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
 567         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 568         /*
 569          * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
 570          * statement so the compiler knows explicitly to check this case first.
 571          * For the Optimized ALUA access state case, we want to process the
 572          * incoming fabric cmd ASAP..
 573          */
 574         if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
 575                 return 0;
 576
 577         switch (out_alua_state) {
 578         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 579                 ret = core_alua_state_nonoptimized(cmd, cdb,
 580                                         nonop_delay_msecs, &alua_ascq);
 581                 break;
 582         case ALUA_ACCESS_STATE_STANDBY:
 583                 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
 584                 break;
 585         case ALUA_ACCESS_STATE_UNAVAILABLE:
 586                 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
 587                 break;
 588         case ALUA_ACCESS_STATE_TRANSITION:
 589                 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
 590                 break;
 591         /*
 592          * OFFLINE is a secondary ALUA target port group access state, that is
 593          * handled above with struct se_port->sep_tg_pt_secondary_offline=1
 594          */
 595         case ALUA_ACCESS_STATE_OFFLINE:
 596         default:
 597                 pr_err("Unknown ALUA access state: 0x%02x\n",
 598                                 out_alua_state);
 599                 return TCM_INVALID_CDB_FIELD;
 600         }
 601
 602 out:
 603         if (ret > 0) {
 604                 /*
 605                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
 606                  * The ALUA additional sense code qualifier (ASCQ) is determined
 607                  * by the ALUA primary or secondary access state..
 608                  */
 609                 pr_debug("[%s]: ALUA TG Port not available, "
 610                         "SenseKey: NOT_READY, ASC/ASCQ: "
 611                         "0x04/0x%02x\n",
 612                         cmd->se_tfo->get_fabric_name(), alua_ascq);
 613
 614                 cmd->scsi_asc = 0x04;
 615                 cmd->scsi_ascq = alua_ascq;
 616                 return TCM_CHECK_CONDITION_NOT_READY;
 617         }
 618
 619         return 0;
 620 }
 621
 622 /*
 623  * Check implict and explict ALUA state change request.
 624  */
 625 static sense_reason_t
 626 core_alua_check_transition(int state, int *primary)
 627 {
 628         switch (state) {
 629         case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
 630         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 631         case ALUA_ACCESS_STATE_STANDBY:
 632         case ALUA_ACCESS_STATE_UNAVAILABLE:
 633                 /*
 634                  * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
 635                  * defined as primary target port asymmetric access states.
 636                  */
 637                 *primary = 1;
 638                 break;
 639         case ALUA_ACCESS_STATE_OFFLINE:
 640                 /*
 641                  * OFFLINE state is defined as a secondary target port
 642                  * asymmetric access state.
 643                  */
 644                 *primary = 0;
 645                 break;
 646         default:
 647                 pr_err("Unknown ALUA access state: 0x%02x\n", state);
 648                 return TCM_INVALID_PARAMETER_LIST;
 649         }
 650
 651         return 0;
 652 }
 653
 654 static char *core_alua_dump_state(int state)
 655 {
 656         switch (state) {
 657         case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
 658                 return "Active/Optimized";
 659         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
 660                 return "Active/NonOptimized";
 661         case ALUA_ACCESS_STATE_STANDBY:
 662                 return "Standby";
 663         case ALUA_ACCESS_STATE_UNAVAILABLE:
 664                 return "Unavailable";
 665         case ALUA_ACCESS_STATE_OFFLINE:
 666                 return "Offline";
 667         default:
 668                 return "Unknown";
 669         }
 670
 671         return NULL;
 672 }
 673
 674 char *core_alua_dump_status(int status)
 675 {
 676         switch (status) {
 677         case ALUA_STATUS_NONE:
 678                 return "None";
 679         case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
 680                 return "Altered by Explict STPG";
 681         case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
 682                 return "Altered by Implict ALUA";
 683         default:
 684                 return "Unknown";
 685         }
 686
 687         return NULL;
 688 }
 689
 690 /*
 691  * Used by fabric modules to determine when we need to delay processing
 692  * for the Active/NonOptimized paths..
 693  */
 694 int core_alua_check_nonop_delay(
 695         struct se_cmd *cmd)
 696 {
 697         if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
 698                 return 0;
 699         if (in_interrupt())
 700                 return 0;
 701         /*
 702          * The ALUA Active/NonOptimized access state delay can be disabled
 703          * in via configfs with a value of zero
 704          */
 705         if (!cmd->alua_nonop_delay)
 706                 return 0;
 707         /*
 708          * struct se_cmd->alua_nonop_delay gets set by a target port group
 709          * defined interval in core_alua_state_nonoptimized()
 710          */
 711         msleep_interruptible(cmd->alua_nonop_delay);
 712         return 0;
 713 }
 714 EXPORT_SYMBOL(core_alua_check_nonop_delay);
 715
 716 /*
 717  * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
 718  *
 719  */
 720 static int core_alua_write_tpg_metadata(
 721         const char *path,
 722         unsigned char *md_buf,
 723         u32 md_buf_len)
 724 {
 725         struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
 726         int ret;
 727
 728         if (IS_ERR(file)) {
 729                 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 730                 return -ENODEV;
 731         }
 732         ret = kernel_write(file, md_buf, md_buf_len, 0);
 733         if (ret < 0)
 734                 pr_err("Error writing ALUA metadata file: %s\n", path);
 735         fput(file);
 736         return (ret < 0) ? -EIO : 0;
 737 }
 738
 739 /*
 740  * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 741  */
 742 static int core_alua_update_tpg_primary_metadata(
 743         struct t10_alua_tg_pt_gp *tg_pt_gp,
 744         int primary_state,
 745         unsigned char *md_buf)
 746 {
 747         struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
 748         char path[ALUA_METADATA_PATH_LEN];
 749         int len;
 750
 751         memset(path, 0, ALUA_METADATA_PATH_LEN);
 752
 753         len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
 754                         "tg_pt_gp_id=%hu\n"
 755                         "alua_access_state=0x%02x\n"
 756                         "alua_access_status=0x%02x\n",
 757                         tg_pt_gp->tg_pt_gp_id, primary_state,
 758                         tg_pt_gp->tg_pt_gp_alua_access_status);
 759
 760         snprintf(path, ALUA_METADATA_PATH_LEN,
 761                 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
 762                 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
 763
 764         return core_alua_write_tpg_metadata(path, md_buf, len);
 765 }
 766
 767 static int core_alua_do_transition_tg_pt(
 768         struct t10_alua_tg_pt_gp *tg_pt_gp,
 769         struct se_port *l_port,
 770         struct se_node_acl *nacl,
 771         unsigned char *md_buf,
 772         int new_state,
 773         int explict)
 774 {
 775         struct se_dev_entry *se_deve;
 776         struct se_lun_acl *lacl;
 777         struct se_port *port;
 778         struct t10_alua_tg_pt_gp_member *mem;
 779         int old_state = 0;
 780         /*
 781          * Save the old primary ALUA access state, and set the current state
 782          * to ALUA_ACCESS_STATE_TRANSITION.
 783          */
 784         old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
 785         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
 786                         ALUA_ACCESS_STATE_TRANSITION);
 787         tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
 788                                 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
 789                                 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
 790         /*
 791          * Check for the optional ALUA primary state transition delay
 792          */
 793         if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
 794                 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
 795
 796         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 797         list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
 798                                 tg_pt_gp_mem_list) {
 799                 port = mem->tg_pt;
 800                 /*
 801                  * After an implicit target port asymmetric access state
 802                  * change, a device server shall establish a unit attention
 803                  * condition for the initiator port associated with every I_T
 804                  * nexus with the additional sense code set to ASYMMETRIC
 805                  * ACCESS STATE CHAGED.
 806                  *
 807                  * After an explicit target port asymmetric access state
 808                  * change, a device server shall establish a unit attention
 809                  * condition with the additional sense code set to ASYMMETRIC
 810                  * ACCESS STATE CHANGED for the initiator port associated with
 811                  * every I_T nexus other than the I_T nexus on which the SET
 812                  * TARGET PORT GROUPS command
 813                  */
 814                 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
 815                 smp_mb__after_atomic_inc();
 816                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 817
 818                 spin_lock_bh(&port->sep_alua_lock);
 819                 list_for_each_entry(se_deve, &port->sep_alua_list,
 820                                         alua_port_list) {
 821                         lacl = se_deve->se_lun_acl;
 822                         /*
 823                          * se_deve->se_lun_acl pointer may be NULL for a
 824                          * entry created without explict Node+MappedLUN ACLs
 825                          */
 826                         if (!lacl)
 827                                 continue;
 828
 829                         if (explict &&
 830                            (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
 831                            (l_port != NULL) && (l_port == port))
 832                                 continue;
 833
 834                         core_scsi3_ua_allocate(lacl->se_lun_nacl,
 835                                 se_deve->mapped_lun, 0x2A,
 836                                 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
 837                 }
 838                 spin_unlock_bh(&port->sep_alua_lock);
 839
 840                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 841                 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
 842                 smp_mb__after_atomic_dec();
 843         }
 844         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 845         /*
 846          * Update the ALUA metadata buf that has been allocated in
 847          * core_alua_do_port_transition(), this metadata will be written
 848          * to struct file.
 849          *
 850          * Note that there is the case where we do not want to update the
 851          * metadata when the saved metadata is being parsed in userspace
 852          * when setting the existing port access state and access status.
 853          *
 854          * Also note that the failure to write out the ALUA metadata to
 855          * struct file does NOT affect the actual ALUA transition.
 856          */
 857         if (tg_pt_gp->tg_pt_gp_write_metadata) {
 858                 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
 859                 core_alua_update_tpg_primary_metadata(tg_pt_gp,
 860                                         new_state, md_buf);
 861                 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
 862         }
 863         /*
 864          * Set the current primary ALUA access state to the requested new state
 865          */
 866         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
 867
 868         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
 869                 " from primary access state %s to %s\n", (explict) ? "explict" :
 870                 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
 871                 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
 872                 core_alua_dump_state(new_state));
 873
 874         return 0;
 875 }
 876
 877 int core_alua_do_port_transition(
 878         struct t10_alua_tg_pt_gp *l_tg_pt_gp,
 879         struct se_device *l_dev,
 880         struct se_port *l_port,
 881         struct se_node_acl *l_nacl,
 882         int new_state,
 883         int explict)
 884 {
 885         struct se_device *dev;
 886         struct se_port *port;
 887         struct se_node_acl *nacl;
 888         struct t10_alua_lu_gp *lu_gp;
 889         struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
 890         struct t10_alua_tg_pt_gp *tg_pt_gp;
 891         unsigned char *md_buf;
 892         int primary;
 893
 894         if (core_alua_check_transition(new_state, &primary) != 0)
 895                 return -EINVAL;
 896
 897         md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
 898         if (!md_buf) {
 899                 pr_err("Unable to allocate buf for ALUA metadata\n");
 900                 return -ENOMEM;
 901         }
 902
 903         local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
 904         spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
 905         lu_gp = local_lu_gp_mem->lu_gp;
 906         atomic_inc(&lu_gp->lu_gp_ref_cnt);
 907         smp_mb__after_atomic_inc();
 908         spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
 909         /*
 910          * For storage objects that are members of the 'default_lu_gp',
 911          * we only do transition on the passed *l_tp_pt_gp, and not
 912          * on all of the matching target port groups IDs in default_lu_gp.
 913          */
 914         if (!lu_gp->lu_gp_id) {
 915                 /*
 916                  * core_alua_do_transition_tg_pt() will always return
 917                  * success.
 918                  */
 919                 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
 920                                         md_buf, new_state, explict);
 921                 atomic_dec(&lu_gp->lu_gp_ref_cnt);
 922                 smp_mb__after_atomic_dec();
 923                 kfree(md_buf);
 924                 return 0;
 925         }
 926         /*
 927          * For all other LU groups aside from 'default_lu_gp', walk all of
 928          * the associated storage objects looking for a matching target port
 929          * group ID from the local target port group.
 930          */
 931         spin_lock(&lu_gp->lu_gp_lock);
 932         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
 933                                 lu_gp_mem_list) {
 934
 935                 dev = lu_gp_mem->lu_gp_mem_dev;
 936                 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
 937                 smp_mb__after_atomic_inc();
 938                 spin_unlock(&lu_gp->lu_gp_lock);
 939
 940                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 941                 list_for_each_entry(tg_pt_gp,
 942                                 &dev->t10_alua.tg_pt_gps_list,
 943                                 tg_pt_gp_list) {
 944
 945                         if (!tg_pt_gp->tg_pt_gp_valid_id)
 946                                 continue;
 947                         /*
 948                          * If the target behavior port asymmetric access state
 949                          * is changed for any target port group accessiable via
 950                          * a logical unit within a LU group, the target port
 951                          * behavior group asymmetric access states for the same
 952                          * target port group accessible via other logical units
 953                          * in that LU group will also change.
 954                          */
 955                         if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
 956                                 continue;
 957
 958                         if (l_tg_pt_gp == tg_pt_gp) {
 959                                 port = l_port;
 960                                 nacl = l_nacl;
 961                         } else {
 962                                 port = NULL;
 963                                 nacl = NULL;
 964                         }
 965                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
 966                         smp_mb__after_atomic_inc();
 967                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 968                         /*
 969                          * core_alua_do_transition_tg_pt() will always return
 970                          * success.
 971                          */
 972                         core_alua_do_transition_tg_pt(tg_pt_gp, port,
 973                                         nacl, md_buf, new_state, explict);
 974
 975                         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
 976                         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
 977                         smp_mb__after_atomic_dec();
 978                 }
 979                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
 980
 981                 spin_lock(&lu_gp->lu_gp_lock);
 982                 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
 983                 smp_mb__after_atomic_dec();
 984         }
 985         spin_unlock(&lu_gp->lu_gp_lock);
 986
 987         pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
 988                 " Group IDs: %hu %s transition to primary state: %s\n",
 989                 config_item_name(&lu_gp->lu_gp_group.cg_item),
 990                 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
 991                 core_alua_dump_state(new_state));
 992
 993         atomic_dec(&lu_gp->lu_gp_ref_cnt);
 994         smp_mb__after_atomic_dec();
 995         kfree(md_buf);
 996         return 0;
 997 }
 998
 999 /*
1000  * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1001  */
1002 static int core_alua_update_tpg_secondary_metadata(
1003         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1004         struct se_port *port,
1005         unsigned char *md_buf,
1006         u32 md_buf_len)
1007 {
1008         struct se_portal_group *se_tpg = port->sep_tpg;
1009         char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1010         int len;
1011
1012         memset(path, 0, ALUA_METADATA_PATH_LEN);
1013         memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1014
1015         len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1016                         se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1017
1018         if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1019                 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1020                                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1021
1022         len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
1023                         "alua_tg_pt_status=0x%02x\n",
1024                         atomic_read(&port->sep_tg_pt_secondary_offline),
1025                         port->sep_tg_pt_secondary_stat);
1026
1027         snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1028                         se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1029                         port->sep_lun->unpacked_lun);
1030
1031         return core_alua_write_tpg_metadata(path, md_buf, len);
1032 }
1033
1034 static int core_alua_set_tg_pt_secondary_state(
1035         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1036         struct se_port *port,
1037         int explict,
1038         int offline)
1039 {
1040         struct t10_alua_tg_pt_gp *tg_pt_gp;
1041         unsigned char *md_buf;
1042         u32 md_buf_len;
1043         int trans_delay_msecs;
1044
1045         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1046         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1047         if (!tg_pt_gp) {
1048                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1049                 pr_err("Unable to complete secondary state"
1050                                 " transition\n");
1051                 return -EINVAL;
1052         }
1053         trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1054         /*
1055          * Set the secondary ALUA target port access state to OFFLINE
1056          * or release the previously secondary state for struct se_port
1057          */
1058         if (offline)
1059                 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1060         else
1061                 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1062
1063         md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1064         port->sep_tg_pt_secondary_stat = (explict) ?
1065                         ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1066                         ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1067
1068         pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1069                 " to secondary access state: %s\n", (explict) ? "explict" :
1070                 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1071                 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1072
1073         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1074         /*
1075          * Do the optional transition delay after we set the secondary
1076          * ALUA access state.
1077          */
1078         if (trans_delay_msecs != 0)
1079                 msleep_interruptible(trans_delay_msecs);
1080         /*
1081          * See if we need to update the ALUA fabric port metadata for
1082          * secondary state and status
1083          */
1084         if (port->sep_tg_pt_secondary_write_md) {
1085                 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
1086                 if (!md_buf) {
1087                         pr_err("Unable to allocate md_buf for"
1088                                 " secondary ALUA access metadata\n");
1089                         return -ENOMEM;
1090                 }
1091                 mutex_lock(&port->sep_tg_pt_md_mutex);
1092                 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1093                                 md_buf, md_buf_len);
1094                 mutex_unlock(&port->sep_tg_pt_md_mutex);
1095
1096                 kfree(md_buf);
1097         }
1098
1099         return 0;
1100 }
1101
1102 struct t10_alua_lu_gp *
1103 core_alua_allocate_lu_gp(const char *name, int def_group)
1104 {
1105         struct t10_alua_lu_gp *lu_gp;
1106
1107         lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1108         if (!lu_gp) {
1109                 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1110                 return ERR_PTR(-ENOMEM);
1111         }
1112         INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1113         INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1114         spin_lock_init(&lu_gp->lu_gp_lock);
1115         atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1116
1117         if (def_group) {
1118                 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1119                 lu_gp->lu_gp_valid_id = 1;
1120                 alua_lu_gps_count++;
1121         }
1122
1123         return lu_gp;
1124 }
1125
1126 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1127 {
1128         struct t10_alua_lu_gp *lu_gp_tmp;
1129         u16 lu_gp_id_tmp;
1130         /*
1131          * The lu_gp->lu_gp_id may only be set once..
1132          */
1133         if (lu_gp->lu_gp_valid_id) {
1134                 pr_warn("ALUA LU Group already has a valid ID,"
1135                         " ignoring request\n");
1136                 return -EINVAL;
1137         }
1138
1139         spin_lock(&lu_gps_lock);
1140         if (alua_lu_gps_count == 0x0000ffff) {
1141                 pr_err("Maximum ALUA alua_lu_gps_count:"
1142                                 " 0x0000ffff reached\n");
1143                 spin_unlock(&lu_gps_lock);
1144                 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1145                 return -ENOSPC;
1146         }
1147 again:
1148         lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1149                                 alua_lu_gps_counter++;
1150
1151         list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1152                 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1153                         if (!lu_gp_id)
1154                                 goto again;
1155
1156                         pr_warn("ALUA Logical Unit Group ID: %hu"
1157                                 " already exists, ignoring request\n",
1158                                 lu_gp_id);
1159                         spin_unlock(&lu_gps_lock);
1160                         return -EINVAL;
1161                 }
1162         }
1163
1164         lu_gp->lu_gp_id = lu_gp_id_tmp;
1165         lu_gp->lu_gp_valid_id = 1;
1166         list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1167         alua_lu_gps_count++;
1168         spin_unlock(&lu_gps_lock);
1169
1170         return 0;
1171 }
1172
1173 static struct t10_alua_lu_gp_member *
1174 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1175 {
1176         struct t10_alua_lu_gp_member *lu_gp_mem;
1177
1178         lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1179         if (!lu_gp_mem) {
1180                 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1181                 return ERR_PTR(-ENOMEM);
1182         }
1183         INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1184         spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1185         atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1186
1187         lu_gp_mem->lu_gp_mem_dev = dev;
1188         dev->dev_alua_lu_gp_mem = lu_gp_mem;
1189
1190         return lu_gp_mem;
1191 }
1192
1193 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1194 {
1195         struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1196         /*
1197          * Once we have reached this point, config_item_put() has
1198          * already been called from target_core_alua_drop_lu_gp().
1199          *
1200          * Here, we remove the *lu_gp from the global list so that
1201          * no associations can be made while we are releasing
1202          * struct t10_alua_lu_gp.
1203          */
1204         spin_lock(&lu_gps_lock);
1205         list_del(&lu_gp->lu_gp_node);
1206         alua_lu_gps_count--;
1207         spin_unlock(&lu_gps_lock);
1208         /*
1209          * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1210          * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1211          * released with core_alua_put_lu_gp_from_name()
1212          */
1213         while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1214                 cpu_relax();
1215         /*
1216          * Release reference to struct t10_alua_lu_gp * from all associated
1217          * struct se_device.
1218          */
1219         spin_lock(&lu_gp->lu_gp_lock);
1220         list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1221                                 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1222                 if (lu_gp_mem->lu_gp_assoc) {
1223                         list_del(&lu_gp_mem->lu_gp_mem_list);
1224                         lu_gp->lu_gp_members--;
1225                         lu_gp_mem->lu_gp_assoc = 0;
1226                 }
1227                 spin_unlock(&lu_gp->lu_gp_lock);
1228                 /*
1229                  *
1230                  * lu_gp_mem is associated with a single
1231                  * struct se_device->dev_alua_lu_gp_mem, and is released when
1232                  * struct se_device is released via core_alua_free_lu_gp_mem().
1233                  *
1234                  * If the passed lu_gp does NOT match the default_lu_gp, assume
1235                  * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1236                  */
1237                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1238                 if (lu_gp != default_lu_gp)
1239                         __core_alua_attach_lu_gp_mem(lu_gp_mem,
1240                                         default_lu_gp);
1241                 else
1242                         lu_gp_mem->lu_gp = NULL;
1243                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1244
1245                 spin_lock(&lu_gp->lu_gp_lock);
1246         }
1247         spin_unlock(&lu_gp->lu_gp_lock);
1248
1249         kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1250 }
1251
1252 void core_alua_free_lu_gp_mem(struct se_device *dev)
1253 {
1254         struct t10_alua_lu_gp *lu_gp;
1255         struct t10_alua_lu_gp_member *lu_gp_mem;
1256
1257         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1258         if (!lu_gp_mem)
1259                 return;
1260
1261         while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1262                 cpu_relax();
1263
1264         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1265         lu_gp = lu_gp_mem->lu_gp;
1266         if (lu_gp) {
1267                 spin_lock(&lu_gp->lu_gp_lock);
1268                 if (lu_gp_mem->lu_gp_assoc) {
1269                         list_del(&lu_gp_mem->lu_gp_mem_list);
1270                         lu_gp->lu_gp_members--;
1271                         lu_gp_mem->lu_gp_assoc = 0;
1272                 }
1273                 spin_unlock(&lu_gp->lu_gp_lock);
1274                 lu_gp_mem->lu_gp = NULL;
1275         }
1276         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1277
1278         kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1279 }
1280
1281 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1282 {
1283         struct t10_alua_lu_gp *lu_gp;
1284         struct config_item *ci;
1285
1286         spin_lock(&lu_gps_lock);
1287         list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1288                 if (!lu_gp->lu_gp_valid_id)
1289                         continue;
1290                 ci = &lu_gp->lu_gp_group.cg_item;
1291                 if (!strcmp(config_item_name(ci), name)) {
1292                         atomic_inc(&lu_gp->lu_gp_ref_cnt);
1293                         spin_unlock(&lu_gps_lock);
1294                         return lu_gp;
1295                 }
1296         }
1297         spin_unlock(&lu_gps_lock);
1298
1299         return NULL;
1300 }
1301
1302 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1303 {
1304         spin_lock(&lu_gps_lock);
1305         atomic_dec(&lu_gp->lu_gp_ref_cnt);
1306         spin_unlock(&lu_gps_lock);
1307 }
1308
1309 /*
1310  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1311  */
1312 void __core_alua_attach_lu_gp_mem(
1313         struct t10_alua_lu_gp_member *lu_gp_mem,
1314         struct t10_alua_lu_gp *lu_gp)
1315 {
1316         spin_lock(&lu_gp->lu_gp_lock);
1317         lu_gp_mem->lu_gp = lu_gp;
1318         lu_gp_mem->lu_gp_assoc = 1;
1319         list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1320         lu_gp->lu_gp_members++;
1321         spin_unlock(&lu_gp->lu_gp_lock);
1322 }
1323
1324 /*
1325  * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1326  */
1327 void __core_alua_drop_lu_gp_mem(
1328         struct t10_alua_lu_gp_member *lu_gp_mem,
1329         struct t10_alua_lu_gp *lu_gp)
1330 {
1331         spin_lock(&lu_gp->lu_gp_lock);
1332         list_del(&lu_gp_mem->lu_gp_mem_list);
1333         lu_gp_mem->lu_gp = NULL;
1334         lu_gp_mem->lu_gp_assoc = 0;
1335         lu_gp->lu_gp_members--;
1336         spin_unlock(&lu_gp->lu_gp_lock);
1337 }
1338
1339 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1340                 const char *name, int def_group)
1341 {
1342         struct t10_alua_tg_pt_gp *tg_pt_gp;
1343
1344         tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1345         if (!tg_pt_gp) {
1346                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1347                 return NULL;
1348         }
1349         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1350         INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1351         mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1352         spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1353         atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1354         tg_pt_gp->tg_pt_gp_dev = dev;
1355         tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1356         atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1357                 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1358         /*
1359          * Enable both explict and implict ALUA support by default
1360          */
1361         tg_pt_gp->tg_pt_gp_alua_access_type =
1362                         TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1363         /*
1364          * Set the default Active/NonOptimized Delay in milliseconds
1365          */
1366         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1367         tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1368         tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
1369
1370         if (def_group) {
1371                 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1372                 tg_pt_gp->tg_pt_gp_id =
1373                                 dev->t10_alua.alua_tg_pt_gps_counter++;
1374                 tg_pt_gp->tg_pt_gp_valid_id = 1;
1375                 dev->t10_alua.alua_tg_pt_gps_count++;
1376                 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1377                               &dev->t10_alua.tg_pt_gps_list);
1378                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1379         }
1380
1381         return tg_pt_gp;
1382 }
1383
1384 int core_alua_set_tg_pt_gp_id(
1385         struct t10_alua_tg_pt_gp *tg_pt_gp,
1386         u16 tg_pt_gp_id)
1387 {
1388         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1389         struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1390         u16 tg_pt_gp_id_tmp;
1391
1392         /*
1393          * The tg_pt_gp->tg_pt_gp_id may only be set once..
1394          */
1395         if (tg_pt_gp->tg_pt_gp_valid_id) {
1396                 pr_warn("ALUA TG PT Group already has a valid ID,"
1397                         " ignoring request\n");
1398                 return -EINVAL;
1399         }
1400
1401         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1402         if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1403                 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1404                         " 0x0000ffff reached\n");
1405                 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1406                 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1407                 return -ENOSPC;
1408         }
1409 again:
1410         tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1411                         dev->t10_alua.alua_tg_pt_gps_counter++;
1412
1413         list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1414                         tg_pt_gp_list) {
1415                 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1416                         if (!tg_pt_gp_id)
1417                                 goto again;
1418
1419                         pr_err("ALUA Target Port Group ID: %hu already"
1420                                 " exists, ignoring request\n", tg_pt_gp_id);
1421                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1422                         return -EINVAL;
1423                 }
1424         }
1425
1426         tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1427         tg_pt_gp->tg_pt_gp_valid_id = 1;
1428         list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1429                         &dev->t10_alua.tg_pt_gps_list);
1430         dev->t10_alua.alua_tg_pt_gps_count++;
1431         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1432
1433         return 0;
1434 }
1435
1436 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1437         struct se_port *port)
1438 {
1439         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1440
1441         tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1442                                 GFP_KERNEL);
1443         if (!tg_pt_gp_mem) {
1444                 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1445                 return ERR_PTR(-ENOMEM);
1446         }
1447         INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1448         spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1449         atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1450
1451         tg_pt_gp_mem->tg_pt = port;
1452         port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1453
1454         return tg_pt_gp_mem;
1455 }
1456
1457 void core_alua_free_tg_pt_gp(
1458         struct t10_alua_tg_pt_gp *tg_pt_gp)
1459 {
1460         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1461         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1462
1463         /*
1464          * Once we have reached this point, config_item_put() has already
1465          * been called from target_core_alua_drop_tg_pt_gp().
1466          *
1467          * Here we remove *tg_pt_gp from the global list so that
1468          * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1469          * can be made while we are releasing struct t10_alua_tg_pt_gp.
1470          */
1471         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1472         list_del(&tg_pt_gp->tg_pt_gp_list);
1473         dev->t10_alua.alua_tg_pt_gps_counter--;
1474         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1475
1476         /*
1477          * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1478          * core_alua_get_tg_pt_gp_by_name() in
1479          * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1480          * to be released with core_alua_put_tg_pt_gp_from_name().
1481          */
1482         while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1483                 cpu_relax();
1484
1485         /*
1486          * Release reference to struct t10_alua_tg_pt_gp from all associated
1487          * struct se_port.
1488          */
1489         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1490         list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1491                         &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1492                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1493                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1494                         tg_pt_gp->tg_pt_gp_members--;
1495                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1496                 }
1497                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1498                 /*
1499                  * tg_pt_gp_mem is associated with a single
1500                  * se_port->sep_alua_tg_pt_gp_mem, and is released via
1501                  * core_alua_free_tg_pt_gp_mem().
1502                  *
1503                  * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1504                  * assume we want to re-assocate a given tg_pt_gp_mem with
1505                  * default_tg_pt_gp.
1506                  */
1507                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1508                 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1509                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1510                                         dev->t10_alua.default_tg_pt_gp);
1511                 } else
1512                         tg_pt_gp_mem->tg_pt_gp = NULL;
1513                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1514
1515                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1516         }
1517         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1518
1519         kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1520 }
1521
1522 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1523 {
1524         struct t10_alua_tg_pt_gp *tg_pt_gp;
1525         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1526
1527         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1528         if (!tg_pt_gp_mem)
1529                 return;
1530
1531         while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1532                 cpu_relax();
1533
1534         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1535         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1536         if (tg_pt_gp) {
1537                 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1538                 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1539                         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1540                         tg_pt_gp->tg_pt_gp_members--;
1541                         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1542                 }
1543                 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1544                 tg_pt_gp_mem->tg_pt_gp = NULL;
1545         }
1546         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1547
1548         kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1549 }
1550
1551 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1552                 struct se_device *dev, const char *name)
1553 {
1554         struct t10_alua_tg_pt_gp *tg_pt_gp;
1555         struct config_item *ci;
1556
1557         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1558         list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1559                         tg_pt_gp_list) {
1560                 if (!tg_pt_gp->tg_pt_gp_valid_id)
1561                         continue;
1562                 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1563                 if (!strcmp(config_item_name(ci), name)) {
1564                         atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1565                         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1566                         return tg_pt_gp;
1567                 }
1568         }
1569         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1570
1571         return NULL;
1572 }
1573
1574 static void core_alua_put_tg_pt_gp_from_name(
1575         struct t10_alua_tg_pt_gp *tg_pt_gp)
1576 {
1577         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1578
1579         spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1580         atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1581         spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1582 }
1583
1584 /*
1585  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1586  */
1587 void __core_alua_attach_tg_pt_gp_mem(
1588         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1589         struct t10_alua_tg_pt_gp *tg_pt_gp)
1590 {
1591         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1592         tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1593         tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1594         list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1595                         &tg_pt_gp->tg_pt_gp_mem_list);
1596         tg_pt_gp->tg_pt_gp_members++;
1597         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1598 }
1599
1600 /*
1601  * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1602  */
1603 static void __core_alua_drop_tg_pt_gp_mem(
1604         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1605         struct t10_alua_tg_pt_gp *tg_pt_gp)
1606 {
1607         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1608         list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1609         tg_pt_gp_mem->tg_pt_gp = NULL;
1610         tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1611         tg_pt_gp->tg_pt_gp_members--;
1612         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1613 }
1614
1615 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1616 {
1617         struct config_item *tg_pt_ci;
1618         struct t10_alua_tg_pt_gp *tg_pt_gp;
1619         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1620         ssize_t len = 0;
1621
1622         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1623         if (!tg_pt_gp_mem)
1624                 return len;
1625
1626         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1627         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1628         if (tg_pt_gp) {
1629                 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1630                 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1631                         " %hu\nTG Port Primary Access State: %s\nTG Port "
1632                         "Primary Access Status: %s\nTG Port Secondary Access"
1633                         " State: %s\nTG Port Secondary Access Status: %s\n",
1634                         config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1635                         core_alua_dump_state(atomic_read(
1636                                         &tg_pt_gp->tg_pt_gp_alua_access_state)),
1637                         core_alua_dump_status(
1638                                 tg_pt_gp->tg_pt_gp_alua_access_status),
1639                         (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1640                         "Offline" : "None",
1641                         core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1642         }
1643         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1644
1645         return len;
1646 }
1647
1648 ssize_t core_alua_store_tg_pt_gp_info(
1649         struct se_port *port,
1650         const char *page,
1651         size_t count)
1652 {
1653         struct se_portal_group *tpg;
1654         struct se_lun *lun;
1655         struct se_device *dev = port->sep_lun->lun_se_dev;
1656         struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1657         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1658         unsigned char buf[TG_PT_GROUP_NAME_BUF];
1659         int move = 0;
1660
1661         tpg = port->sep_tpg;
1662         lun = port->sep_lun;
1663
1664         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1665         if (!tg_pt_gp_mem)
1666                 return 0;
1667
1668         if (count > TG_PT_GROUP_NAME_BUF) {
1669                 pr_err("ALUA Target Port Group alias too large!\n");
1670                 return -EINVAL;
1671         }
1672         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1673         memcpy(buf, page, count);
1674         /*
1675          * Any ALUA target port group alias besides "NULL" means we will be
1676          * making a new group association.
1677          */
1678         if (strcmp(strstrip(buf), "NULL")) {
1679                 /*
1680                  * core_alua_get_tg_pt_gp_by_name() will increment reference to
1681                  * struct t10_alua_tg_pt_gp.  This reference is released with
1682                  * core_alua_put_tg_pt_gp_from_name() below.
1683                  */
1684                 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1685                                         strstrip(buf));
1686                 if (!tg_pt_gp_new)
1687                         return -ENODEV;
1688         }
1689
1690         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1691         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1692         if (tg_pt_gp) {
1693                 /*
1694                  * Clearing an existing tg_pt_gp association, and replacing
1695                  * with the default_tg_pt_gp.
1696                  */
1697                 if (!tg_pt_gp_new) {
1698                         pr_debug("Target_Core_ConfigFS: Moving"
1699                                 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1700                                 " alua/%s, ID: %hu back to"
1701                                 " default_tg_pt_gp\n",
1702                                 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1703                                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1704                                 config_item_name(&lun->lun_group.cg_item),
1705                                 config_item_name(
1706                                         &tg_pt_gp->tg_pt_gp_group.cg_item),
1707                                 tg_pt_gp->tg_pt_gp_id);
1708
1709                         __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1710                         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1711                                         dev->t10_alua.default_tg_pt_gp);
1712                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1713
1714                         return count;
1715                 }
1716                 /*
1717                  * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1718                  */
1719                 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1720                 move = 1;
1721         }
1722         /*
1723          * Associate tg_pt_gp_mem with tg_pt_gp_new.
1724          */
1725         __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1726         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1727         pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1728                 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1729                 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1730                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1731                 config_item_name(&lun->lun_group.cg_item),
1732                 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1733                 tg_pt_gp_new->tg_pt_gp_id);
1734
1735         core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1736         return count;
1737 }
1738
1739 ssize_t core_alua_show_access_type(
1740         struct t10_alua_tg_pt_gp *tg_pt_gp,
1741         char *page)
1742 {
1743         if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1744             (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1745                 return sprintf(page, "Implict and Explict\n");
1746         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1747                 return sprintf(page, "Implict\n");
1748         else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1749                 return sprintf(page, "Explict\n");
1750         else
1751                 return sprintf(page, "None\n");
1752 }
1753
1754 ssize_t core_alua_store_access_type(
1755         struct t10_alua_tg_pt_gp *tg_pt_gp,
1756         const char *page,
1757         size_t count)
1758 {
1759         unsigned long tmp;
1760         int ret;
1761
1762         ret = kstrtoul(page, 0, &tmp);
1763         if (ret < 0) {
1764                 pr_err("Unable to extract alua_access_type\n");
1765                 return ret;
1766         }
1767         if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
1768                 pr_err("Illegal value for alua_access_type:"
1769                                 " %lu\n", tmp);
1770                 return -EINVAL;
1771         }
1772         if (tmp == 3)
1773                 tg_pt_gp->tg_pt_gp_alua_access_type =
1774                         TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1775         else if (tmp == 2)
1776                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1777         else if (tmp == 1)
1778                 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1779         else
1780                 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1781
1782         return count;
1783 }
1784
1785 ssize_t core_alua_show_nonop_delay_msecs(
1786         struct t10_alua_tg_pt_gp *tg_pt_gp,
1787         char *page)
1788 {
1789         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1790 }
1791
1792 ssize_t core_alua_store_nonop_delay_msecs(
1793         struct t10_alua_tg_pt_gp *tg_pt_gp,
1794         const char *page,
1795         size_t count)
1796 {
1797         unsigned long tmp;
1798         int ret;
1799
1800         ret = kstrtoul(page, 0, &tmp);
1801         if (ret < 0) {
1802                 pr_err("Unable to extract nonop_delay_msecs\n");
1803                 return ret;
1804         }
1805         if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
1806                 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1807                         " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1808                         ALUA_MAX_NONOP_DELAY_MSECS);
1809                 return -EINVAL;
1810         }
1811         tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1812
1813         return count;
1814 }
1815
1816 ssize_t core_alua_show_trans_delay_msecs(
1817         struct t10_alua_tg_pt_gp *tg_pt_gp,
1818         char *page)
1819 {
1820         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1821 }
1822
1823 ssize_t core_alua_store_trans_delay_msecs(
1824         struct t10_alua_tg_pt_gp *tg_pt_gp,
1825         const char *page,
1826         size_t count)
1827 {
1828         unsigned long tmp;
1829         int ret;
1830
1831         ret = kstrtoul(page, 0, &tmp);
1832         if (ret < 0) {
1833                 pr_err("Unable to extract trans_delay_msecs\n");
1834                 return ret;
1835         }
1836         if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
1837                 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1838                         " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1839                         ALUA_MAX_TRANS_DELAY_MSECS);
1840                 return -EINVAL;
1841         }
1842         tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1843
1844         return count;
1845 }
1846
1847 ssize_t core_alua_show_implict_trans_secs(
1848         struct t10_alua_tg_pt_gp *tg_pt_gp,
1849         char *page)
1850 {
1851         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
1852 }
1853
1854 ssize_t core_alua_store_implict_trans_secs(
1855         struct t10_alua_tg_pt_gp *tg_pt_gp,
1856         const char *page,
1857         size_t count)
1858 {
1859         unsigned long tmp;
1860         int ret;
1861
1862         ret = kstrtoul(page, 0, &tmp);
1863         if (ret < 0) {
1864                 pr_err("Unable to extract implict_trans_secs\n");
1865                 return ret;
1866         }
1867         if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
1868                 pr_err("Passed implict_trans_secs: %lu, exceeds"
1869                         " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
1870                         ALUA_MAX_IMPLICT_TRANS_SECS);
1871                 return  -EINVAL;
1872         }
1873         tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
1874
1875         return count;
1876 }
1877
1878 ssize_t core_alua_show_preferred_bit(
1879         struct t10_alua_tg_pt_gp *tg_pt_gp,
1880         char *page)
1881 {
1882         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1883 }
1884
1885 ssize_t core_alua_store_preferred_bit(
1886         struct t10_alua_tg_pt_gp *tg_pt_gp,
1887         const char *page,
1888         size_t count)
1889 {
1890         unsigned long tmp;
1891         int ret;
1892
1893         ret = kstrtoul(page, 0, &tmp);
1894         if (ret < 0) {
1895                 pr_err("Unable to extract preferred ALUA value\n");
1896                 return ret;
1897         }
1898         if ((tmp != 0) && (tmp != 1)) {
1899                 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
1900                 return -EINVAL;
1901         }
1902         tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1903
1904         return count;
1905 }
1906
1907 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1908 {
1909         if (!lun->lun_sep)
1910                 return -ENODEV;
1911
1912         return sprintf(page, "%d\n",
1913                 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1914 }
1915
1916 ssize_t core_alua_store_offline_bit(
1917         struct se_lun *lun,
1918         const char *page,
1919         size_t count)
1920 {
1921         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1922         unsigned long tmp;
1923         int ret;
1924
1925         if (!lun->lun_sep)
1926                 return -ENODEV;
1927
1928         ret = kstrtoul(page, 0, &tmp);
1929         if (ret < 0) {
1930                 pr_err("Unable to extract alua_tg_pt_offline value\n");
1931                 return ret;
1932         }
1933         if ((tmp != 0) && (tmp != 1)) {
1934                 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1935                                 tmp);
1936                 return -EINVAL;
1937         }
1938         tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
1939         if (!tg_pt_gp_mem) {
1940                 pr_err("Unable to locate *tg_pt_gp_mem\n");
1941                 return -EINVAL;
1942         }
1943
1944         ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1945                         lun->lun_sep, 0, (int)tmp);
1946         if (ret < 0)
1947                 return -EINVAL;
1948
1949         return count;
1950 }
1951
1952 ssize_t core_alua_show_secondary_status(
1953         struct se_lun *lun,
1954         char *page)
1955 {
1956         return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1957 }
1958
1959 ssize_t core_alua_store_secondary_status(
1960         struct se_lun *lun,
1961         const char *page,
1962         size_t count)
1963 {
1964         unsigned long tmp;
1965         int ret;
1966
1967         ret = kstrtoul(page, 0, &tmp);
1968         if (ret < 0) {
1969                 pr_err("Unable to extract alua_tg_pt_status\n");
1970                 return ret;
1971         }
1972         if ((tmp != ALUA_STATUS_NONE) &&
1973             (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
1974             (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
1975                 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1976                                 tmp);
1977                 return -EINVAL;
1978         }
1979         lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
1980
1981         return count;
1982 }
1983
1984 ssize_t core_alua_show_secondary_write_metadata(
1985         struct se_lun *lun,
1986         char *page)
1987 {
1988         return sprintf(page, "%d\n",
1989                         lun->lun_sep->sep_tg_pt_secondary_write_md);
1990 }
1991
1992 ssize_t core_alua_store_secondary_write_metadata(
1993         struct se_lun *lun,
1994         const char *page,
1995         size_t count)
1996 {
1997         unsigned long tmp;
1998         int ret;
1999
2000         ret = kstrtoul(page, 0, &tmp);
2001         if (ret < 0) {
2002                 pr_err("Unable to extract alua_tg_pt_write_md\n");
2003                 return ret;
2004         }
2005         if ((tmp != 0) && (tmp != 1)) {
2006                 pr_err("Illegal value for alua_tg_pt_write_md:"
2007                                 " %lu\n", tmp);
2008                 return -EINVAL;
2009         }
2010         lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2011
2012         return count;
2013 }
2014
2015 int core_setup_alua(struct se_device *dev)
2016 {
2017         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2018             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2019                 struct t10_alua_lu_gp_member *lu_gp_mem;
2020
2021                 /*
2022                  * Associate this struct se_device with the default ALUA
2023                  * LUN Group.
2024                  */
2025                 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2026                 if (IS_ERR(lu_gp_mem))
2027                         return PTR_ERR(lu_gp_mem);
2028
2029                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2030                 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2031                                 default_lu_gp);
2032                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2033
2034                 pr_debug("%s: Adding to default ALUA LU Group:"
2035                         " core/alua/lu_gps/default_lu_gp\n",
2036                         dev->transport->name);
2037         }
2038
2039         return 0;
2040 }