Pileus Git - ~andy/linux/blob - drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/export.h>
  39 #include <net/sock.h>
  40 #include <net/tcp.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_device.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_ua.h"
  52
  53 static void se_dev_start(struct se_device *dev);
  54 static void se_dev_stop(struct se_device *dev);
  55
  56 static struct se_hba *lun0_hba;
  57 static struct se_subsystem_dev *lun0_su_dev;
  58 /* not static, needed by tpg.c */
  59 struct se_device *g_lun0_dev;
  60
  61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  62 {
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = se_cmd->se_sess;
  65         struct se_device *dev;
  66         unsigned long flags;
  67
  68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  71                 return -ENODEV;
  72         }
  73
  74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  75         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
  76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                 struct se_dev_entry *deve = se_cmd->se_deve;
  78
  79                 deve->total_cmds++;
  80                 deve->total_bytes += se_cmd->data_length;
  81
  82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  87                                 " Access for 0x%08x\n",
  88                                 se_cmd->se_tfo->get_fabric_name(),
  89                                 unpacked_lun);
  90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  91                         return -EACCES;
  92                 }
  93
  94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  95                         deve->write_bytes += se_cmd->data_length;
  96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  97                         deve->read_bytes += se_cmd->data_length;
  98
  99                 deve->deve_cmds++;
 100
 101                 se_lun = deve->se_lun;
 102                 se_cmd->se_lun = deve->se_lun;
 103                 se_cmd->pr_res_key = deve->pr_res_key;
 104                 se_cmd->orig_fe_lun = unpacked_lun;
 105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 106         }
 107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 108
 109         if (!se_lun) {
 110                 /*
 111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 112                  * REPORT_LUNS, et al to be returned when no active
 113                  * MappedLUN=0 exists for this Initiator Port.
 114                  */
 115                 if (unpacked_lun != 0) {
 116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 119                                 " Access for 0x%08x\n",
 120                                 se_cmd->se_tfo->get_fabric_name(),
 121                                 unpacked_lun);
 122                         return -ENODEV;
 123                 }
 124                 /*
 125                  * Force WRITE PROTECT for virtual LUN 0
 126                  */
 127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                     (se_cmd->data_direction != DMA_NONE)) {
 129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 131                         return -EACCES;
 132                 }
 133
 134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                 se_cmd->orig_fe_lun = 0;
 137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 138         }
 139         /*
 140          * Determine if the struct se_lun is online.
 141          * FIXME: Check for LUN_RESET + UNIT Attention
 142          */
 143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 146                 return -ENODEV;
 147         }
 148
 149         /* Directly associate cmd with se_dev */
 150         se_cmd->se_dev = se_lun->lun_se_dev;
 151
 152         /* TODO: get rid of this and use atomics for stats */
 153         dev = se_lun->lun_se_dev;
 154         spin_lock_irqsave(&dev->stats_lock, flags);
 155         dev->num_cmds++;
 156         if (se_cmd->data_direction == DMA_TO_DEVICE)
 157                 dev->write_bytes += se_cmd->data_length;
 158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 159                 dev->read_bytes += se_cmd->data_length;
 160         spin_unlock_irqrestore(&dev->stats_lock, flags);
 161
 162         /*
 163          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 164          * for tracking state of struct se_cmds during LUN shutdown events.
 165          */
 166         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 167         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 168         atomic_set(&se_cmd->transport_lun_active, 1);
 169         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 170
 171         return 0;
 172 }
 173 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 174
 175 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 176 {
 177         struct se_dev_entry *deve;
 178         struct se_lun *se_lun = NULL;
 179         struct se_session *se_sess = se_cmd->se_sess;
 180         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 181         unsigned long flags;
 182
 183         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 184                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 185                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 186                 return -ENODEV;
 187         }
 188
 189         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 190         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
 191         deve = se_cmd->se_deve;
 192
 193         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 194                 se_tmr->tmr_lun = deve->se_lun;
 195                 se_cmd->se_lun = deve->se_lun;
 196                 se_lun = deve->se_lun;
 197                 se_cmd->pr_res_key = deve->pr_res_key;
 198                 se_cmd->orig_fe_lun = unpacked_lun;
 199         }
 200         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 201
 202         if (!se_lun) {
 203                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 204                         " Access for 0x%08x\n",
 205                         se_cmd->se_tfo->get_fabric_name(),
 206                         unpacked_lun);
 207                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 208                 return -ENODEV;
 209         }
 210         /*
 211          * Determine if the struct se_lun is online.
 212          * FIXME: Check for LUN_RESET + UNIT Attention
 213          */
 214         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 215                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 216                 return -ENODEV;
 217         }
 218
 219         /* Directly associate cmd with se_dev */
 220         se_cmd->se_dev = se_lun->lun_se_dev;
 221         se_tmr->tmr_dev = se_lun->lun_se_dev;
 222
 223         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 224         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 225         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 230
 231 /*
 232  * This function is called from core_scsi3_emulate_pro_register_and_move()
 233  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 234  * when a matching rtpi is found.
 235  */
 236 struct se_dev_entry *core_get_se_deve_from_rtpi(
 237         struct se_node_acl *nacl,
 238         u16 rtpi)
 239 {
 240         struct se_dev_entry *deve;
 241         struct se_lun *lun;
 242         struct se_port *port;
 243         struct se_portal_group *tpg = nacl->se_tpg;
 244         u32 i;
 245
 246         spin_lock_irq(&nacl->device_list_lock);
 247         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 248                 deve = &nacl->device_list[i];
 249
 250                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 251                         continue;
 252
 253                 lun = deve->se_lun;
 254                 if (!lun) {
 255                         pr_err("%s device entries device pointer is"
 256                                 " NULL, but Initiator has access.\n",
 257                                 tpg->se_tpg_tfo->get_fabric_name());
 258                         continue;
 259                 }
 260                 port = lun->lun_sep;
 261                 if (!port) {
 262                         pr_err("%s device entries device pointer is"
 263                                 " NULL, but Initiator has access.\n",
 264                                 tpg->se_tpg_tfo->get_fabric_name());
 265                         continue;
 266                 }
 267                 if (port->sep_rtpi != rtpi)
 268                         continue;
 269
 270                 atomic_inc(&deve->pr_ref_count);
 271                 smp_mb__after_atomic_inc();
 272                 spin_unlock_irq(&nacl->device_list_lock);
 273
 274                 return deve;
 275         }
 276         spin_unlock_irq(&nacl->device_list_lock);
 277
 278         return NULL;
 279 }
 280
 281 int core_free_device_list_for_node(
 282         struct se_node_acl *nacl,
 283         struct se_portal_group *tpg)
 284 {
 285         struct se_dev_entry *deve;
 286         struct se_lun *lun;
 287         u32 i;
 288
 289         if (!nacl->device_list)
 290                 return 0;
 291
 292         spin_lock_irq(&nacl->device_list_lock);
 293         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 294                 deve = &nacl->device_list[i];
 295
 296                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 297                         continue;
 298
 299                 if (!deve->se_lun) {
 300                         pr_err("%s device entries device pointer is"
 301                                 " NULL, but Initiator has access.\n",
 302                                 tpg->se_tpg_tfo->get_fabric_name());
 303                         continue;
 304                 }
 305                 lun = deve->se_lun;
 306
 307                 spin_unlock_irq(&nacl->device_list_lock);
 308                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 309                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 310                 spin_lock_irq(&nacl->device_list_lock);
 311         }
 312         spin_unlock_irq(&nacl->device_list_lock);
 313
 314         kfree(nacl->device_list);
 315         nacl->device_list = NULL;
 316
 317         return 0;
 318 }
 319
 320 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 321 {
 322         struct se_dev_entry *deve;
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 326         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 327         deve->deve_cmds--;
 328         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 329 }
 330
 331 void core_update_device_list_access(
 332         u32 mapped_lun,
 333         u32 lun_access,
 334         struct se_node_acl *nacl)
 335 {
 336         struct se_dev_entry *deve;
 337
 338         spin_lock_irq(&nacl->device_list_lock);
 339         deve = &nacl->device_list[mapped_lun];
 340         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 341                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 342                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 343         } else {
 344                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 345                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 346         }
 347         spin_unlock_irq(&nacl->device_list_lock);
 348 }
 349
 350 /*      core_update_device_list_for_node():
 351  *
 352  *
 353  */
 354 int core_update_device_list_for_node(
 355         struct se_lun *lun,
 356         struct se_lun_acl *lun_acl,
 357         u32 mapped_lun,
 358         u32 lun_access,
 359         struct se_node_acl *nacl,
 360         struct se_portal_group *tpg,
 361         int enable)
 362 {
 363         struct se_port *port = lun->lun_sep;
 364         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 365         int trans = 0;
 366         /*
 367          * If the MappedLUN entry is being disabled, the entry in
 368          * port->sep_alua_list must be removed now before clearing the
 369          * struct se_dev_entry pointers below as logic in
 370          * core_alua_do_transition_tg_pt() depends on these being present.
 371          */
 372         if (!enable) {
 373                 /*
 374                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 375                  * that have not been explicitly concerted to MappedLUNs ->
 376                  * struct se_lun_acl, but we remove deve->alua_port_list from
 377                  * port->sep_alua_list. This also means that active UAs and
 378                  * NodeACL context specific PR metadata for demo-mode
 379                  * MappedLUN *deve will be released below..
 380                  */
 381                 spin_lock_bh(&port->sep_alua_lock);
 382                 list_del(&deve->alua_port_list);
 383                 spin_unlock_bh(&port->sep_alua_lock);
 384         }
 385
 386         spin_lock_irq(&nacl->device_list_lock);
 387         if (enable) {
 388                 /*
 389                  * Check if the call is handling demo mode -> explict LUN ACL
 390                  * transition.  This transition must be for the same struct se_lun
 391                  * + mapped_lun that was setup in demo mode..
 392                  */
 393                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 394                         if (deve->se_lun_acl != NULL) {
 395                                 pr_err("struct se_dev_entry->se_lun_acl"
 396                                         " already set for demo mode -> explict"
 397                                         " LUN ACL transition\n");
 398                                 spin_unlock_irq(&nacl->device_list_lock);
 399                                 return -EINVAL;
 400                         }
 401                         if (deve->se_lun != lun) {
 402                                 pr_err("struct se_dev_entry->se_lun does"
 403                                         " match passed struct se_lun for demo mode"
 404                                         " -> explict LUN ACL transition\n");
 405                                 spin_unlock_irq(&nacl->device_list_lock);
 406                                 return -EINVAL;
 407                         }
 408                         deve->se_lun_acl = lun_acl;
 409                         trans = 1;
 410                 } else {
 411                         deve->se_lun = lun;
 412                         deve->se_lun_acl = lun_acl;
 413                         deve->mapped_lun = mapped_lun;
 414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 415                 }
 416
 417                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 418                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 419                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 420                 } else {
 421                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 422                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 423                 }
 424
 425                 if (trans) {
 426                         spin_unlock_irq(&nacl->device_list_lock);
 427                         return 0;
 428                 }
 429                 deve->creation_time = get_jiffies_64();
 430                 deve->attach_count++;
 431                 spin_unlock_irq(&nacl->device_list_lock);
 432
 433                 spin_lock_bh(&port->sep_alua_lock);
 434                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 435                 spin_unlock_bh(&port->sep_alua_lock);
 436
 437                 return 0;
 438         }
 439         /*
 440          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 441          * PR operation to complete.
 442          */
 443         spin_unlock_irq(&nacl->device_list_lock);
 444         while (atomic_read(&deve->pr_ref_count) != 0)
 445                 cpu_relax();
 446         spin_lock_irq(&nacl->device_list_lock);
 447         /*
 448          * Disable struct se_dev_entry LUN ACL mapping
 449          */
 450         core_scsi3_ua_release_all(deve);
 451         deve->se_lun = NULL;
 452         deve->se_lun_acl = NULL;
 453         deve->lun_flags = 0;
 454         deve->creation_time = 0;
 455         deve->attach_count--;
 456         spin_unlock_irq(&nacl->device_list_lock);
 457
 458         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 459         return 0;
 460 }
 461
 462 /*      core_clear_lun_from_tpg():
 463  *
 464  *
 465  */
 466 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 467 {
 468         struct se_node_acl *nacl;
 469         struct se_dev_entry *deve;
 470         u32 i;
 471
 472         spin_lock_irq(&tpg->acl_node_lock);
 473         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 474                 spin_unlock_irq(&tpg->acl_node_lock);
 475
 476                 spin_lock_irq(&nacl->device_list_lock);
 477                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 478                         deve = &nacl->device_list[i];
 479                         if (lun != deve->se_lun)
 480                                 continue;
 481                         spin_unlock_irq(&nacl->device_list_lock);
 482
 483                         core_update_device_list_for_node(lun, NULL,
 484                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 485                                 nacl, tpg, 0);
 486
 487                         spin_lock_irq(&nacl->device_list_lock);
 488                 }
 489                 spin_unlock_irq(&nacl->device_list_lock);
 490
 491                 spin_lock_irq(&tpg->acl_node_lock);
 492         }
 493         spin_unlock_irq(&tpg->acl_node_lock);
 494 }
 495
 496 static struct se_port *core_alloc_port(struct se_device *dev)
 497 {
 498         struct se_port *port, *port_tmp;
 499
 500         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 501         if (!port) {
 502                 pr_err("Unable to allocate struct se_port\n");
 503                 return ERR_PTR(-ENOMEM);
 504         }
 505         INIT_LIST_HEAD(&port->sep_alua_list);
 506         INIT_LIST_HEAD(&port->sep_list);
 507         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 508         spin_lock_init(&port->sep_alua_lock);
 509         mutex_init(&port->sep_tg_pt_md_mutex);
 510
 511         spin_lock(&dev->se_port_lock);
 512         if (dev->dev_port_count == 0x0000ffff) {
 513                 pr_warn("Reached dev->dev_port_count =="
 514                                 " 0x0000ffff\n");
 515                 spin_unlock(&dev->se_port_lock);
 516                 return ERR_PTR(-ENOSPC);
 517         }
 518 again:
 519         /*
 520          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 521          * Here is the table from spc4r17 section 7.7.3.8.
 522          *
 523          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 524          *
 525          * Code      Description
 526          * 0h        Reserved
 527          * 1h        Relative port 1, historically known as port A
 528          * 2h        Relative port 2, historically known as port B
 529          * 3h to FFFFh    Relative port 3 through 65 535
 530          */
 531         port->sep_rtpi = dev->dev_rpti_counter++;
 532         if (!port->sep_rtpi)
 533                 goto again;
 534
 535         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 536                 /*
 537                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 538                  * for 16-bit wrap..
 539                  */
 540                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 541                         goto again;
 542         }
 543         spin_unlock(&dev->se_port_lock);
 544
 545         return port;
 546 }
 547
 548 static void core_export_port(
 549         struct se_device *dev,
 550         struct se_portal_group *tpg,
 551         struct se_port *port,
 552         struct se_lun *lun)
 553 {
 554         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 555         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 556
 557         spin_lock(&dev->se_port_lock);
 558         spin_lock(&lun->lun_sep_lock);
 559         port->sep_tpg = tpg;
 560         port->sep_lun = lun;
 561         lun->lun_sep = port;
 562         spin_unlock(&lun->lun_sep_lock);
 563
 564         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 565         spin_unlock(&dev->se_port_lock);
 566
 567         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 568                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 569                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 570                         pr_err("Unable to allocate t10_alua_tg_pt"
 571                                         "_gp_member_t\n");
 572                         return;
 573                 }
 574                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 575                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 576                         su_dev->t10_alua.default_tg_pt_gp);
 577                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 578                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 579                         " Group: alua/default_tg_pt_gp\n",
 580                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 581         }
 582
 583         dev->dev_port_count++;
 584         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 585 }
 586
 587 /*
 588  *      Called with struct se_device->se_port_lock spinlock held.
 589  */
 590 static void core_release_port(struct se_device *dev, struct se_port *port)
 591         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 592 {
 593         /*
 594          * Wait for any port reference for PR ALL_TG_PT=1 operation
 595          * to complete in __core_scsi3_alloc_registration()
 596          */
 597         spin_unlock(&dev->se_port_lock);
 598         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 599                 cpu_relax();
 600         spin_lock(&dev->se_port_lock);
 601
 602         core_alua_free_tg_pt_gp_mem(port);
 603
 604         list_del(&port->sep_list);
 605         dev->dev_port_count--;
 606         kfree(port);
 607 }
 608
 609 int core_dev_export(
 610         struct se_device *dev,
 611         struct se_portal_group *tpg,
 612         struct se_lun *lun)
 613 {
 614         struct se_port *port;
 615
 616         port = core_alloc_port(dev);
 617         if (IS_ERR(port))
 618                 return PTR_ERR(port);
 619
 620         lun->lun_se_dev = dev;
 621         se_dev_start(dev);
 622
 623         atomic_inc(&dev->dev_export_obj.obj_access_count);
 624         core_export_port(dev, tpg, port, lun);
 625         return 0;
 626 }
 627
 628 void core_dev_unexport(
 629         struct se_device *dev,
 630         struct se_portal_group *tpg,
 631         struct se_lun *lun)
 632 {
 633         struct se_port *port = lun->lun_sep;
 634
 635         spin_lock(&lun->lun_sep_lock);
 636         if (lun->lun_se_dev == NULL) {
 637                 spin_unlock(&lun->lun_sep_lock);
 638                 return;
 639         }
 640         spin_unlock(&lun->lun_sep_lock);
 641
 642         spin_lock(&dev->se_port_lock);
 643         atomic_dec(&dev->dev_export_obj.obj_access_count);
 644         core_release_port(dev, port);
 645         spin_unlock(&dev->se_port_lock);
 646
 647         se_dev_stop(dev);
 648         lun->lun_se_dev = NULL;
 649 }
 650
 651 int target_report_luns(struct se_task *se_task)
 652 {
 653         struct se_cmd *se_cmd = se_task->task_se_cmd;
 654         struct se_dev_entry *deve;
 655         struct se_lun *se_lun;
 656         struct se_session *se_sess = se_cmd->se_sess;
 657         unsigned char *buf;
 658         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 659
 660         buf = transport_kmap_first_data_page(se_cmd);
 661
 662         /*
 663          * If no struct se_session pointer is present, this struct se_cmd is
 664          * coming via a target_core_mod PASSTHROUGH op, and not through
 665          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 666          */
 667         if (!se_sess) {
 668                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 669                 lun_count = 1;
 670                 goto done;
 671         }
 672
 673         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 674         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 675                 deve = &se_sess->se_node_acl->device_list[i];
 676                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 677                         continue;
 678                 se_lun = deve->se_lun;
 679                 /*
 680                  * We determine the correct LUN LIST LENGTH even once we
 681                  * have reached the initial allocation length.
 682                  * See SPC2-R20 7.19.
 683                  */
 684                 lun_count++;
 685                 if ((cdb_offset + 8) >= se_cmd->data_length)
 686                         continue;
 687
 688                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 689                 offset += 8;
 690                 cdb_offset += 8;
 691         }
 692         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 693
 694         /*
 695          * See SPC3 r07, page 159.
 696          */
 697 done:
 698         transport_kunmap_first_data_page(se_cmd);
 699         lun_count *= 8;
 700         buf[0] = ((lun_count >> 24) & 0xff);
 701         buf[1] = ((lun_count >> 16) & 0xff);
 702         buf[2] = ((lun_count >> 8) & 0xff);
 703         buf[3] = (lun_count & 0xff);
 704
 705         se_task->task_scsi_status = GOOD;
 706         transport_complete_task(se_task, 1);
 707         return 0;
 708 }
 709
 710 /*      se_release_device_for_hba():
 711  *
 712  *
 713  */
 714 void se_release_device_for_hba(struct se_device *dev)
 715 {
 716         struct se_hba *hba = dev->se_hba;
 717
 718         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 719             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 720             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 721             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 722             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 723                 se_dev_stop(dev);
 724
 725         if (dev->dev_ptr) {
 726                 kthread_stop(dev->process_thread);
 727                 if (dev->transport->free_device)
 728                         dev->transport->free_device(dev->dev_ptr);
 729         }
 730
 731         spin_lock(&hba->device_lock);
 732         list_del(&dev->dev_list);
 733         hba->dev_count--;
 734         spin_unlock(&hba->device_lock);
 735
 736         core_scsi3_free_all_registrations(dev);
 737         se_release_vpd_for_dev(dev);
 738
 739         kfree(dev);
 740 }
 741
 742 void se_release_vpd_for_dev(struct se_device *dev)
 743 {
 744         struct t10_vpd *vpd, *vpd_tmp;
 745
 746         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 747         list_for_each_entry_safe(vpd, vpd_tmp,
 748                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 749                 list_del(&vpd->vpd_list);
 750                 kfree(vpd);
 751         }
 752         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 753 }
 754
 755 /*      se_free_virtual_device():
 756  *
 757  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 758  */
 759 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 760 {
 761         if (!list_empty(&dev->dev_sep_list))
 762                 dump_stack();
 763
 764         core_alua_free_lu_gp_mem(dev);
 765         se_release_device_for_hba(dev);
 766
 767         return 0;
 768 }
 769
 770 static void se_dev_start(struct se_device *dev)
 771 {
 772         struct se_hba *hba = dev->se_hba;
 773
 774         spin_lock(&hba->device_lock);
 775         atomic_inc(&dev->dev_obj.obj_access_count);
 776         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 777                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 778                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 779                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 780                 } else if (dev->dev_status &
 781                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 782                         dev->dev_status &=
 783                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 784                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 785                 }
 786         }
 787         spin_unlock(&hba->device_lock);
 788 }
 789
 790 static void se_dev_stop(struct se_device *dev)
 791 {
 792         struct se_hba *hba = dev->se_hba;
 793
 794         spin_lock(&hba->device_lock);
 795         atomic_dec(&dev->dev_obj.obj_access_count);
 796         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 797                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 798                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 799                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 800                 } else if (dev->dev_status &
 801                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 802                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 803                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 804                 }
 805         }
 806         spin_unlock(&hba->device_lock);
 807 }
 808
 809 int se_dev_check_online(struct se_device *dev)
 810 {
 811         unsigned long flags;
 812         int ret;
 813
 814         spin_lock_irqsave(&dev->dev_status_lock, flags);
 815         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 816                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 817         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 818
 819         return ret;
 820 }
 821
 822 int se_dev_check_shutdown(struct se_device *dev)
 823 {
 824         int ret;
 825
 826         spin_lock_irq(&dev->dev_status_lock);
 827         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 828         spin_unlock_irq(&dev->dev_status_lock);
 829
 830         return ret;
 831 }
 832
 833 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 834 {
 835         u32 tmp, aligned_max_sectors;
 836         /*
 837          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 838          * transport_allocate_data_tasks() operation.
 839          */
 840         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 841         aligned_max_sectors = (tmp / block_size);
 842         if (max_sectors != aligned_max_sectors) {
 843                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 844                                 " to %u\n", max_sectors, aligned_max_sectors);
 845                 return aligned_max_sectors;
 846         }
 847
 848         return max_sectors;
 849 }
 850
 851 void se_dev_set_default_attribs(
 852         struct se_device *dev,
 853         struct se_dev_limits *dev_limits)
 854 {
 855         struct queue_limits *limits = &dev_limits->limits;
 856
 857         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 858         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 859         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 860         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 861         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 862         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 863         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 864         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 865         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 866         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 867         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 868         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 869         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 870         /*
 871          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 872          * iblock_create_virtdevice() from struct queue_limits values
 873          * if blk_queue_discard()==1
 874          */
 875         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 876         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 877                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 878         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 879         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 880                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 881         /*
 882          * block_size is based on subsystem plugin dependent requirements.
 883          */
 884         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 885         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 886         /*
 887          * max_sectors is based on subsystem plugin dependent requirements.
 888          */
 889         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 890         /*
 891          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
 892          */
 893         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
 894                                                 limits->logical_block_size);
 895         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 896         /*
 897          * Set optimal_sectors from max_sectors, which can be lowered via
 898          * configfs.
 899          */
 900         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
 901         /*
 902          * queue_depth is based on subsystem plugin dependent requirements.
 903          */
 904         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 905         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 906 }
 907
 908 int se_dev_set_max_unmap_lba_count(
 909         struct se_device *dev,
 910         u32 max_unmap_lba_count)
 911 {
 912         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 913         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 914                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 915         return 0;
 916 }
 917
 918 int se_dev_set_max_unmap_block_desc_count(
 919         struct se_device *dev,
 920         u32 max_unmap_block_desc_count)
 921 {
 922         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 923                 max_unmap_block_desc_count;
 924         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 925                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 926         return 0;
 927 }
 928
 929 int se_dev_set_unmap_granularity(
 930         struct se_device *dev,
 931         u32 unmap_granularity)
 932 {
 933         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 934         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 935                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 936         return 0;
 937 }
 938
 939 int se_dev_set_unmap_granularity_alignment(
 940         struct se_device *dev,
 941         u32 unmap_granularity_alignment)
 942 {
 943         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 944         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 945                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 946         return 0;
 947 }
 948
 949 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 950 {
 951         if (flag != 0 && flag != 1) {
 952                 pr_err("Illegal value %d\n", flag);
 953                 return -EINVAL;
 954         }
 955
 956         if (flag) {
 957                 pr_err("dpo_emulated not supported\n");
 958                 return -EINVAL;
 959         }
 960
 961         return 0;
 962 }
 963
 964 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 965 {
 966         if (flag != 0 && flag != 1) {
 967                 pr_err("Illegal value %d\n", flag);
 968                 return -EINVAL;
 969         }
 970
 971         if (flag && dev->transport->fua_write_emulated == 0) {
 972                 pr_err("fua_write_emulated not supported\n");
 973                 return -EINVAL;
 974         }
 975         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 976         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 977                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 978         return 0;
 979 }
 980
 981 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 982 {
 983         if (flag != 0 && flag != 1) {
 984                 pr_err("Illegal value %d\n", flag);
 985                 return -EINVAL;
 986         }
 987
 988         if (flag) {
 989                 pr_err("ua read emulated not supported\n");
 990                 return -EINVAL;
 991         }
 992
 993         return 0;
 994 }
 995
 996 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 997 {
 998         if (flag != 0 && flag != 1) {
 999                 pr_err("Illegal value %d\n", flag);
1000                 return -EINVAL;
1001         }
1002         if (flag && dev->transport->write_cache_emulated == 0) {
1003                 pr_err("write_cache_emulated not supported\n");
1004                 return -EINVAL;
1005         }
1006         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1007         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1008                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1009         return 0;
1010 }
1011
1012 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1013 {
1014         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1015                 pr_err("Illegal value %d\n", flag);
1016                 return -EINVAL;
1017         }
1018
1019         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1020                 pr_err("dev[%p]: Unable to change SE Device"
1021                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1022                         " exists\n", dev,
1023                         atomic_read(&dev->dev_export_obj.obj_access_count));
1024                 return -EINVAL;
1025         }
1026         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1027         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1028                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1029
1030         return 0;
1031 }
1032
1033 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1034 {
1035         if ((flag != 0) && (flag != 1)) {
1036                 pr_err("Illegal value %d\n", flag);
1037                 return -EINVAL;
1038         }
1039
1040         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1041                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1042                         " dev_export_obj: %d count exists\n", dev,
1043                         atomic_read(&dev->dev_export_obj.obj_access_count));
1044                 return -EINVAL;
1045         }
1046         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1047         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1048                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1049
1050         return 0;
1051 }
1052
1053 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1054 {
1055         if ((flag != 0) && (flag != 1)) {
1056                 pr_err("Illegal value %d\n", flag);
1057                 return -EINVAL;
1058         }
1059         /*
1060          * We expect this value to be non-zero when generic Block Layer
1061          * Discard supported is detected iblock_create_virtdevice().
1062          */
1063         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1064                 pr_err("Generic Block Discard not supported\n");
1065                 return -ENOSYS;
1066         }
1067
1068         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1069         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1070                                 dev, flag);
1071         return 0;
1072 }
1073
1074 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1075 {
1076         if ((flag != 0) && (flag != 1)) {
1077                 pr_err("Illegal value %d\n", flag);
1078                 return -EINVAL;
1079         }
1080         /*
1081          * We expect this value to be non-zero when generic Block Layer
1082          * Discard supported is detected iblock_create_virtdevice().
1083          */
1084         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1085                 pr_err("Generic Block Discard not supported\n");
1086                 return -ENOSYS;
1087         }
1088
1089         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1090         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1091                                 dev, flag);
1092         return 0;
1093 }
1094
1095 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1096 {
1097         if ((flag != 0) && (flag != 1)) {
1098                 pr_err("Illegal value %d\n", flag);
1099                 return -EINVAL;
1100         }
1101         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1102         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1103                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1104         return 0;
1105 }
1106
1107 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1108 {
1109         if ((flag != 0) && (flag != 1)) {
1110                 printk(KERN_ERR "Illegal value %d\n", flag);
1111                 return -EINVAL;
1112         }
1113         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1114         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1115                dev, flag);
1116         return 0;
1117 }
1118
1119 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1120 {
1121         if (flag != 0) {
1122                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1123                         " reordering not implemented\n", dev);
1124                 return -ENOSYS;
1125         }
1126         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1127         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1128         return 0;
1129 }
1130
1131 /*
1132  * Note, this can only be called on unexported SE Device Object.
1133  */
1134 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1135 {
1136         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1137                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1138                         " dev_export_obj: %d count exists\n", dev,
1139                         atomic_read(&dev->dev_export_obj.obj_access_count));
1140                 return -EINVAL;
1141         }
1142         if (!queue_depth) {
1143                 pr_err("dev[%p]: Illegal ZERO value for queue"
1144                         "_depth\n", dev);
1145                 return -EINVAL;
1146         }
1147
1148         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1149                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1150                         pr_err("dev[%p]: Passed queue_depth: %u"
1151                                 " exceeds TCM/SE_Device TCQ: %u\n",
1152                                 dev, queue_depth,
1153                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1154                         return -EINVAL;
1155                 }
1156         } else {
1157                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1158                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1159                                 pr_err("dev[%p]: Passed queue_depth:"
1160                                         " %u exceeds TCM/SE_Device MAX"
1161                                         " TCQ: %u\n", dev, queue_depth,
1162                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1163                                 return -EINVAL;
1164                         }
1165                 }
1166         }
1167
1168         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1169         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1170                         dev, queue_depth);
1171         return 0;
1172 }
1173
1174 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1175 {
1176         int force = 0; /* Force setting for VDEVS */
1177
1178         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1179                 pr_err("dev[%p]: Unable to change SE Device"
1180                         " max_sectors while dev_export_obj: %d count exists\n",
1181                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1182                 return -EINVAL;
1183         }
1184         if (!max_sectors) {
1185                 pr_err("dev[%p]: Illegal ZERO value for"
1186                         " max_sectors\n", dev);
1187                 return -EINVAL;
1188         }
1189         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1190                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1191                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1192                                 DA_STATUS_MAX_SECTORS_MIN);
1193                 return -EINVAL;
1194         }
1195         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1196                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1197                         pr_err("dev[%p]: Passed max_sectors: %u"
1198                                 " greater than TCM/SE_Device max_sectors:"
1199                                 " %u\n", dev, max_sectors,
1200                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1201                          return -EINVAL;
1202                 }
1203         } else {
1204                 if (!force && (max_sectors >
1205                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1206                         pr_err("dev[%p]: Passed max_sectors: %u"
1207                                 " greater than TCM/SE_Device max_sectors"
1208                                 ": %u, use force=1 to override.\n", dev,
1209                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1210                         return -EINVAL;
1211                 }
1212                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1213                         pr_err("dev[%p]: Passed max_sectors: %u"
1214                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1215                                 " %u\n", dev, max_sectors,
1216                                 DA_STATUS_MAX_SECTORS_MAX);
1217                         return -EINVAL;
1218                 }
1219         }
1220         /*
1221          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1222          */
1223         max_sectors = se_dev_align_max_sectors(max_sectors,
1224                                 dev->se_sub_dev->se_dev_attrib.block_size);
1225
1226         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1227         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1228                         dev, max_sectors);
1229         return 0;
1230 }
1231
1232 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1233 {
1234         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1235                 pr_err("dev[%p]: Unable to change SE Device"
1236                         " optimal_sectors while dev_export_obj: %d count exists\n",
1237                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1238                 return -EINVAL;
1239         }
1240         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1241                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1242                                 " changed for TCM/pSCSI\n", dev);
1243                 return -EINVAL;
1244         }
1245         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1246                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1247                         " greater than max_sectors: %u\n", dev,
1248                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1249                 return -EINVAL;
1250         }
1251
1252         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1253         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1254                         dev, optimal_sectors);
1255         return 0;
1256 }
1257
1258 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1259 {
1260         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1261                 pr_err("dev[%p]: Unable to change SE Device block_size"
1262                         " while dev_export_obj: %d count exists\n", dev,
1263                         atomic_read(&dev->dev_export_obj.obj_access_count));
1264                 return -EINVAL;
1265         }
1266
1267         if ((block_size != 512) &&
1268             (block_size != 1024) &&
1269             (block_size != 2048) &&
1270             (block_size != 4096)) {
1271                 pr_err("dev[%p]: Illegal value for block_device: %u"
1272                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1273                         dev, block_size);
1274                 return -EINVAL;
1275         }
1276
1277         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1278                 pr_err("dev[%p]: Not allowed to change block_size for"
1279                         " Physical Device, use for Linux/SCSI to change"
1280                         " block_size for underlying hardware\n", dev);
1281                 return -EINVAL;
1282         }
1283
1284         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1285         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1286                         dev, block_size);
1287         return 0;
1288 }
1289
1290 struct se_lun *core_dev_add_lun(
1291         struct se_portal_group *tpg,
1292         struct se_hba *hba,
1293         struct se_device *dev,
1294         u32 lun)
1295 {
1296         struct se_lun *lun_p;
1297         u32 lun_access = 0;
1298
1299         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1300                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1301                         atomic_read(&dev->dev_access_obj.obj_access_count));
1302                 return NULL;
1303         }
1304
1305         lun_p = core_tpg_pre_addlun(tpg, lun);
1306         if ((IS_ERR(lun_p)) || !lun_p)
1307                 return NULL;
1308
1309         if (dev->dev_flags & DF_READ_ONLY)
1310                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1311         else
1312                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1313
1314         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1315                 return NULL;
1316
1317         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1318                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1319                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1320                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1321         /*
1322          * Update LUN maps for dynamically added initiators when
1323          * generate_node_acl is enabled.
1324          */
1325         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1326                 struct se_node_acl *acl;
1327                 spin_lock_irq(&tpg->acl_node_lock);
1328                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1329                         if (acl->dynamic_node_acl &&
1330                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1331                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1332                                 spin_unlock_irq(&tpg->acl_node_lock);
1333                                 core_tpg_add_node_to_devs(acl, tpg);
1334                                 spin_lock_irq(&tpg->acl_node_lock);
1335                         }
1336                 }
1337                 spin_unlock_irq(&tpg->acl_node_lock);
1338         }
1339
1340         return lun_p;
1341 }
1342
1343 /*      core_dev_del_lun():
1344  *
1345  *
1346  */
1347 int core_dev_del_lun(
1348         struct se_portal_group *tpg,
1349         u32 unpacked_lun)
1350 {
1351         struct se_lun *lun;
1352         int ret = 0;
1353
1354         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1355         if (!lun)
1356                 return ret;
1357
1358         core_tpg_post_dellun(tpg, lun);
1359
1360         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1361                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1362                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1363                 tpg->se_tpg_tfo->get_fabric_name());
1364
1365         return 0;
1366 }
1367
1368 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1369 {
1370         struct se_lun *lun;
1371
1372         spin_lock(&tpg->tpg_lun_lock);
1373         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1374                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1375                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1376                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1377                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1378                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1379                 spin_unlock(&tpg->tpg_lun_lock);
1380                 return NULL;
1381         }
1382         lun = &tpg->tpg_lun_list[unpacked_lun];
1383
1384         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1385                 pr_err("%s Logical Unit Number: %u is not free on"
1386                         " Target Portal Group: %hu, ignoring request.\n",
1387                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1388                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1389                 spin_unlock(&tpg->tpg_lun_lock);
1390                 return NULL;
1391         }
1392         spin_unlock(&tpg->tpg_lun_lock);
1393
1394         return lun;
1395 }
1396
1397 /*      core_dev_get_lun():
1398  *
1399  *
1400  */
1401 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1402 {
1403         struct se_lun *lun;
1404
1405         spin_lock(&tpg->tpg_lun_lock);
1406         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1407                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1408                         "_TPG-1: %u for Target Portal Group: %hu\n",
1409                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1410                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1411                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1412                 spin_unlock(&tpg->tpg_lun_lock);
1413                 return NULL;
1414         }
1415         lun = &tpg->tpg_lun_list[unpacked_lun];
1416
1417         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1418                 pr_err("%s Logical Unit Number: %u is not active on"
1419                         " Target Portal Group: %hu, ignoring request.\n",
1420                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1421                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1422                 spin_unlock(&tpg->tpg_lun_lock);
1423                 return NULL;
1424         }
1425         spin_unlock(&tpg->tpg_lun_lock);
1426
1427         return lun;
1428 }
1429
1430 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1431         struct se_portal_group *tpg,
1432         u32 mapped_lun,
1433         char *initiatorname,
1434         int *ret)
1435 {
1436         struct se_lun_acl *lacl;
1437         struct se_node_acl *nacl;
1438
1439         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1440                 pr_err("%s InitiatorName exceeds maximum size.\n",
1441                         tpg->se_tpg_tfo->get_fabric_name());
1442                 *ret = -EOVERFLOW;
1443                 return NULL;
1444         }
1445         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1446         if (!nacl) {
1447                 *ret = -EINVAL;
1448                 return NULL;
1449         }
1450         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1451         if (!lacl) {
1452                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1453                 *ret = -ENOMEM;
1454                 return NULL;
1455         }
1456
1457         INIT_LIST_HEAD(&lacl->lacl_list);
1458         lacl->mapped_lun = mapped_lun;
1459         lacl->se_lun_nacl = nacl;
1460         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1461
1462         return lacl;
1463 }
1464
1465 int core_dev_add_initiator_node_lun_acl(
1466         struct se_portal_group *tpg,
1467         struct se_lun_acl *lacl,
1468         u32 unpacked_lun,
1469         u32 lun_access)
1470 {
1471         struct se_lun *lun;
1472         struct se_node_acl *nacl;
1473
1474         lun = core_dev_get_lun(tpg, unpacked_lun);
1475         if (!lun) {
1476                 pr_err("%s Logical Unit Number: %u is not active on"
1477                         " Target Portal Group: %hu, ignoring request.\n",
1478                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1479                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1480                 return -EINVAL;
1481         }
1482
1483         nacl = lacl->se_lun_nacl;
1484         if (!nacl)
1485                 return -EINVAL;
1486
1487         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1488             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1489                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1490
1491         lacl->se_lun = lun;
1492
1493         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1494                         lun_access, nacl, tpg, 1) < 0)
1495                 return -EINVAL;
1496
1497         spin_lock(&lun->lun_acl_lock);
1498         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1499         atomic_inc(&lun->lun_acl_count);
1500         smp_mb__after_atomic_inc();
1501         spin_unlock(&lun->lun_acl_lock);
1502
1503         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1504                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1505                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1506                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1507                 lacl->initiatorname);
1508         /*
1509          * Check to see if there are any existing persistent reservation APTPL
1510          * pre-registrations that need to be enabled for this LUN ACL..
1511          */
1512         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1513         return 0;
1514 }
1515
1516 /*      core_dev_del_initiator_node_lun_acl():
1517  *
1518  *
1519  */
1520 int core_dev_del_initiator_node_lun_acl(
1521         struct se_portal_group *tpg,
1522         struct se_lun *lun,
1523         struct se_lun_acl *lacl)
1524 {
1525         struct se_node_acl *nacl;
1526
1527         nacl = lacl->se_lun_nacl;
1528         if (!nacl)
1529                 return -EINVAL;
1530
1531         spin_lock(&lun->lun_acl_lock);
1532         list_del(&lacl->lacl_list);
1533         atomic_dec(&lun->lun_acl_count);
1534         smp_mb__after_atomic_dec();
1535         spin_unlock(&lun->lun_acl_lock);
1536
1537         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1538                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1539
1540         lacl->se_lun = NULL;
1541
1542         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1543                 " InitiatorNode: %s Mapped LUN: %u\n",
1544                 tpg->se_tpg_tfo->get_fabric_name(),
1545                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1546                 lacl->initiatorname, lacl->mapped_lun);
1547
1548         return 0;
1549 }
1550
1551 void core_dev_free_initiator_node_lun_acl(
1552         struct se_portal_group *tpg,
1553         struct se_lun_acl *lacl)
1554 {
1555         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1556                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1557                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1558                 tpg->se_tpg_tfo->get_fabric_name(),
1559                 lacl->initiatorname, lacl->mapped_lun);
1560
1561         kfree(lacl);
1562 }
1563
1564 int core_dev_setup_virtual_lun0(void)
1565 {
1566         struct se_hba *hba;
1567         struct se_device *dev;
1568         struct se_subsystem_dev *se_dev = NULL;
1569         struct se_subsystem_api *t;
1570         char buf[16];
1571         int ret;
1572
1573         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1574         if (IS_ERR(hba))
1575                 return PTR_ERR(hba);
1576
1577         lun0_hba = hba;
1578         t = hba->transport;
1579
1580         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1581         if (!se_dev) {
1582                 pr_err("Unable to allocate memory for"
1583                                 " struct se_subsystem_dev\n");
1584                 ret = -ENOMEM;
1585                 goto out;
1586         }
1587         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1588         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1589         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1590         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1591         spin_lock_init(&se_dev->t10_pr.registration_lock);
1592         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1593         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1594         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1595         spin_lock_init(&se_dev->se_dev_lock);
1596         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1597         se_dev->t10_wwn.t10_sub_dev = se_dev;
1598         se_dev->t10_alua.t10_sub_dev = se_dev;
1599         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1600         se_dev->se_dev_hba = hba;
1601
1602         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1603         if (!se_dev->se_dev_su_ptr) {
1604                 pr_err("Unable to locate subsystem dependent pointer"
1605                         " from allocate_virtdevice()\n");
1606                 ret = -ENOMEM;
1607                 goto out;
1608         }
1609         lun0_su_dev = se_dev;
1610
1611         memset(buf, 0, 16);
1612         sprintf(buf, "rd_pages=8");
1613         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1614
1615         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1616         if (IS_ERR(dev)) {
1617                 ret = PTR_ERR(dev);
1618                 goto out;
1619         }
1620         se_dev->se_dev_ptr = dev;
1621         g_lun0_dev = dev;
1622
1623         return 0;
1624 out:
1625         lun0_su_dev = NULL;
1626         kfree(se_dev);
1627         if (lun0_hba) {
1628                 core_delete_hba(lun0_hba);
1629                 lun0_hba = NULL;
1630         }
1631         return ret;
1632 }
1633
1634
1635 void core_dev_release_virtual_lun0(void)
1636 {
1637         struct se_hba *hba = lun0_hba;
1638         struct se_subsystem_dev *su_dev = lun0_su_dev;
1639
1640         if (!hba)
1641                 return;
1642
1643         if (g_lun0_dev)
1644                 se_free_virtual_device(g_lun0_dev, hba);
1645
1646         kfree(su_dev);
1647         core_delete_hba(hba);
1648 }