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