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_device.h>
  46 #include <target/target_core_tpg.h>
  47 #include <target/target_core_transport.h>
  48 #include <target/target_core_fabric_ops.h>
  49
  50 #include "target_core_alua.h"
  51 #include "target_core_hba.h"
  52 #include "target_core_pr.h"
  53 #include "target_core_ua.h"
  54
  55 static void se_dev_start(struct se_device *dev);
  56 static void se_dev_stop(struct se_device *dev);
  57
  58 static struct se_hba *lun0_hba;
  59 static struct se_subsystem_dev *lun0_su_dev;
  60 /* not static, needed by tpg.c */
  61 struct se_device *g_lun0_dev;
  62
  63 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  64 {
  65         struct se_lun *se_lun = NULL;
  66         struct se_session *se_sess = se_cmd->se_sess;
  67         struct se_device *dev;
  68         unsigned long flags;
  69
  70         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  71                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  72                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  73                 return -ENODEV;
  74         }
  75
  76         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  77         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
  78         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  79                 struct se_dev_entry *deve = se_cmd->se_deve;
  80
  81                 deve->total_cmds++;
  82                 deve->total_bytes += se_cmd->data_length;
  83
  84                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  85                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  86                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  87                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  88                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  89                                 " Access for 0x%08x\n",
  90                                 se_cmd->se_tfo->get_fabric_name(),
  91                                 unpacked_lun);
  92                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  93                         return -EACCES;
  94                 }
  95
  96                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  97                         deve->write_bytes += se_cmd->data_length;
  98                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  99                         deve->read_bytes += se_cmd->data_length;
 100
 101                 deve->deve_cmds++;
 102
 103                 se_lun = deve->se_lun;
 104                 se_cmd->se_lun = deve->se_lun;
 105                 se_cmd->pr_res_key = deve->pr_res_key;
 106                 se_cmd->orig_fe_lun = unpacked_lun;
 107                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 108         }
 109         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 110
 111         if (!se_lun) {
 112                 /*
 113                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 114                  * REPORT_LUNS, et al to be returned when no active
 115                  * MappedLUN=0 exists for this Initiator Port.
 116                  */
 117                 if (unpacked_lun != 0) {
 118                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 119                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 120                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 121                                 " Access for 0x%08x\n",
 122                                 se_cmd->se_tfo->get_fabric_name(),
 123                                 unpacked_lun);
 124                         return -ENODEV;
 125                 }
 126                 /*
 127                  * Force WRITE PROTECT for virtual LUN 0
 128                  */
 129                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 130                     (se_cmd->data_direction != DMA_NONE)) {
 131                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 132                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 133                         return -EACCES;
 134                 }
 135
 136                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 137                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 138                 se_cmd->orig_fe_lun = 0;
 139                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 140         }
 141         /*
 142          * Determine if the struct se_lun is online.
 143          * FIXME: Check for LUN_RESET + UNIT Attention
 144          */
 145         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 146                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 147                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 148                 return -ENODEV;
 149         }
 150
 151         /* Directly associate cmd with se_dev */
 152         se_cmd->se_dev = se_lun->lun_se_dev;
 153
 154         /* TODO: get rid of this and use atomics for stats */
 155         dev = se_lun->lun_se_dev;
 156         spin_lock_irqsave(&dev->stats_lock, flags);
 157         dev->num_cmds++;
 158         if (se_cmd->data_direction == DMA_TO_DEVICE)
 159                 dev->write_bytes += se_cmd->data_length;
 160         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 161                 dev->read_bytes += se_cmd->data_length;
 162         spin_unlock_irqrestore(&dev->stats_lock, flags);
 163
 164         /*
 165          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 166          * for tracking state of struct se_cmds during LUN shutdown events.
 167          */
 168         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 169         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 170         atomic_set(&se_cmd->transport_lun_active, 1);
 171         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 176
 177 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 178 {
 179         struct se_dev_entry *deve;
 180         struct se_lun *se_lun = NULL;
 181         struct se_session *se_sess = se_cmd->se_sess;
 182         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 183         unsigned long flags;
 184
 185         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 186                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 187                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 188                 return -ENODEV;
 189         }
 190
 191         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 192         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
 193         deve = se_cmd->se_deve;
 194
 195         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 196                 se_tmr->tmr_lun = deve->se_lun;
 197                 se_cmd->se_lun = deve->se_lun;
 198                 se_lun = deve->se_lun;
 199                 se_cmd->pr_res_key = deve->pr_res_key;
 200                 se_cmd->orig_fe_lun = unpacked_lun;
 201         }
 202         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 203
 204         if (!se_lun) {
 205                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 206                         " Access for 0x%08x\n",
 207                         se_cmd->se_tfo->get_fabric_name(),
 208                         unpacked_lun);
 209                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 210                 return -ENODEV;
 211         }
 212         /*
 213          * Determine if the struct se_lun is online.
 214          * FIXME: Check for LUN_RESET + UNIT Attention
 215          */
 216         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 217                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 218                 return -ENODEV;
 219         }
 220
 221         /* Directly associate cmd with se_dev */
 222         se_cmd->se_dev = se_lun->lun_se_dev;
 223         se_tmr->tmr_dev = se_lun->lun_se_dev;
 224
 225         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 226         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 227         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 228
 229         return 0;
 230 }
 231 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 232
 233 /*
 234  * This function is called from core_scsi3_emulate_pro_register_and_move()
 235  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 236  * when a matching rtpi is found.
 237  */
 238 struct se_dev_entry *core_get_se_deve_from_rtpi(
 239         struct se_node_acl *nacl,
 240         u16 rtpi)
 241 {
 242         struct se_dev_entry *deve;
 243         struct se_lun *lun;
 244         struct se_port *port;
 245         struct se_portal_group *tpg = nacl->se_tpg;
 246         u32 i;
 247
 248         spin_lock_irq(&nacl->device_list_lock);
 249         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 250                 deve = &nacl->device_list[i];
 251
 252                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 253                         continue;
 254
 255                 lun = deve->se_lun;
 256                 if (!lun) {
 257                         pr_err("%s device entries device pointer is"
 258                                 " NULL, but Initiator has access.\n",
 259                                 tpg->se_tpg_tfo->get_fabric_name());
 260                         continue;
 261                 }
 262                 port = lun->lun_sep;
 263                 if (!port) {
 264                         pr_err("%s device entries device pointer is"
 265                                 " NULL, but Initiator has access.\n",
 266                                 tpg->se_tpg_tfo->get_fabric_name());
 267                         continue;
 268                 }
 269                 if (port->sep_rtpi != rtpi)
 270                         continue;
 271
 272                 atomic_inc(&deve->pr_ref_count);
 273                 smp_mb__after_atomic_inc();
 274                 spin_unlock_irq(&nacl->device_list_lock);
 275
 276                 return deve;
 277         }
 278         spin_unlock_irq(&nacl->device_list_lock);
 279
 280         return NULL;
 281 }
 282
 283 int core_free_device_list_for_node(
 284         struct se_node_acl *nacl,
 285         struct se_portal_group *tpg)
 286 {
 287         struct se_dev_entry *deve;
 288         struct se_lun *lun;
 289         u32 i;
 290
 291         if (!nacl->device_list)
 292                 return 0;
 293
 294         spin_lock_irq(&nacl->device_list_lock);
 295         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 296                 deve = &nacl->device_list[i];
 297
 298                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 299                         continue;
 300
 301                 if (!deve->se_lun) {
 302                         pr_err("%s device entries device pointer is"
 303                                 " NULL, but Initiator has access.\n",
 304                                 tpg->se_tpg_tfo->get_fabric_name());
 305                         continue;
 306                 }
 307                 lun = deve->se_lun;
 308
 309                 spin_unlock_irq(&nacl->device_list_lock);
 310                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 311                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 312                 spin_lock_irq(&nacl->device_list_lock);
 313         }
 314         spin_unlock_irq(&nacl->device_list_lock);
 315
 316         kfree(nacl->device_list);
 317         nacl->device_list = NULL;
 318
 319         return 0;
 320 }
 321
 322 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 323 {
 324         struct se_dev_entry *deve;
 325
 326         spin_lock_irq(&se_nacl->device_list_lock);
 327         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 328         deve->deve_cmds--;
 329         spin_unlock_irq(&se_nacl->device_list_lock);
 330 }
 331
 332 void core_update_device_list_access(
 333         u32 mapped_lun,
 334         u32 lun_access,
 335         struct se_node_acl *nacl)
 336 {
 337         struct se_dev_entry *deve;
 338
 339         spin_lock_irq(&nacl->device_list_lock);
 340         deve = &nacl->device_list[mapped_lun];
 341         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 342                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 343                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 344         } else {
 345                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 346                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 347         }
 348         spin_unlock_irq(&nacl->device_list_lock);
 349 }
 350
 351 /*      core_update_device_list_for_node():
 352  *
 353  *
 354  */
 355 int core_update_device_list_for_node(
 356         struct se_lun *lun,
 357         struct se_lun_acl *lun_acl,
 358         u32 mapped_lun,
 359         u32 lun_access,
 360         struct se_node_acl *nacl,
 361         struct se_portal_group *tpg,
 362         int enable)
 363 {
 364         struct se_port *port = lun->lun_sep;
 365         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 366         int trans = 0;
 367         /*
 368          * If the MappedLUN entry is being disabled, the entry in
 369          * port->sep_alua_list must be removed now before clearing the
 370          * struct se_dev_entry pointers below as logic in
 371          * core_alua_do_transition_tg_pt() depends on these being present.
 372          */
 373         if (!enable) {
 374                 /*
 375                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 376                  * that have not been explicitly concerted to MappedLUNs ->
 377                  * struct se_lun_acl, but we remove deve->alua_port_list from
 378                  * port->sep_alua_list. This also means that active UAs and
 379                  * NodeACL context specific PR metadata for demo-mode
 380                  * MappedLUN *deve will be released below..
 381                  */
 382                 spin_lock_bh(&port->sep_alua_lock);
 383                 list_del(&deve->alua_port_list);
 384                 spin_unlock_bh(&port->sep_alua_lock);
 385         }
 386
 387         spin_lock_irq(&nacl->device_list_lock);
 388         if (enable) {
 389                 /*
 390                  * Check if the call is handling demo mode -> explict LUN ACL
 391                  * transition.  This transition must be for the same struct se_lun
 392                  * + mapped_lun that was setup in demo mode..
 393                  */
 394                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 395                         if (deve->se_lun_acl != NULL) {
 396                                 pr_err("struct se_dev_entry->se_lun_acl"
 397                                         " already set for demo mode -> explict"
 398                                         " LUN ACL transition\n");
 399                                 spin_unlock_irq(&nacl->device_list_lock);
 400                                 return -EINVAL;
 401                         }
 402                         if (deve->se_lun != lun) {
 403                                 pr_err("struct se_dev_entry->se_lun does"
 404                                         " match passed struct se_lun for demo mode"
 405                                         " -> explict LUN ACL transition\n");
 406                                 spin_unlock_irq(&nacl->device_list_lock);
 407                                 return -EINVAL;
 408                         }
 409                         deve->se_lun_acl = lun_acl;
 410                         trans = 1;
 411                 } else {
 412                         deve->se_lun = lun;
 413                         deve->se_lun_acl = lun_acl;
 414                         deve->mapped_lun = mapped_lun;
 415                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 416                 }
 417
 418                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 419                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 420                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 421                 } else {
 422                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 423                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 424                 }
 425
 426                 if (trans) {
 427                         spin_unlock_irq(&nacl->device_list_lock);
 428                         return 0;
 429                 }
 430                 deve->creation_time = get_jiffies_64();
 431                 deve->attach_count++;
 432                 spin_unlock_irq(&nacl->device_list_lock);
 433
 434                 spin_lock_bh(&port->sep_alua_lock);
 435                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 436                 spin_unlock_bh(&port->sep_alua_lock);
 437
 438                 return 0;
 439         }
 440         /*
 441          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 442          * PR operation to complete.
 443          */
 444         spin_unlock_irq(&nacl->device_list_lock);
 445         while (atomic_read(&deve->pr_ref_count) != 0)
 446                 cpu_relax();
 447         spin_lock_irq(&nacl->device_list_lock);
 448         /*
 449          * Disable struct se_dev_entry LUN ACL mapping
 450          */
 451         core_scsi3_ua_release_all(deve);
 452         deve->se_lun = NULL;
 453         deve->se_lun_acl = NULL;
 454         deve->lun_flags = 0;
 455         deve->creation_time = 0;
 456         deve->attach_count--;
 457         spin_unlock_irq(&nacl->device_list_lock);
 458
 459         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 460         return 0;
 461 }
 462
 463 /*      core_clear_lun_from_tpg():
 464  *
 465  *
 466  */
 467 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 468 {
 469         struct se_node_acl *nacl;
 470         struct se_dev_entry *deve;
 471         u32 i;
 472
 473         spin_lock_irq(&tpg->acl_node_lock);
 474         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 475                 spin_unlock_irq(&tpg->acl_node_lock);
 476
 477                 spin_lock_irq(&nacl->device_list_lock);
 478                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 479                         deve = &nacl->device_list[i];
 480                         if (lun != deve->se_lun)
 481                                 continue;
 482                         spin_unlock_irq(&nacl->device_list_lock);
 483
 484                         core_update_device_list_for_node(lun, NULL,
 485                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 486                                 nacl, tpg, 0);
 487
 488                         spin_lock_irq(&nacl->device_list_lock);
 489                 }
 490                 spin_unlock_irq(&nacl->device_list_lock);
 491
 492                 spin_lock_irq(&tpg->acl_node_lock);
 493         }
 494         spin_unlock_irq(&tpg->acl_node_lock);
 495 }
 496
 497 static struct se_port *core_alloc_port(struct se_device *dev)
 498 {
 499         struct se_port *port, *port_tmp;
 500
 501         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 502         if (!port) {
 503                 pr_err("Unable to allocate struct se_port\n");
 504                 return ERR_PTR(-ENOMEM);
 505         }
 506         INIT_LIST_HEAD(&port->sep_alua_list);
 507         INIT_LIST_HEAD(&port->sep_list);
 508         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 509         spin_lock_init(&port->sep_alua_lock);
 510         mutex_init(&port->sep_tg_pt_md_mutex);
 511
 512         spin_lock(&dev->se_port_lock);
 513         if (dev->dev_port_count == 0x0000ffff) {
 514                 pr_warn("Reached dev->dev_port_count =="
 515                                 " 0x0000ffff\n");
 516                 spin_unlock(&dev->se_port_lock);
 517                 return ERR_PTR(-ENOSPC);
 518         }
 519 again:
 520         /*
 521          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 522          * Here is the table from spc4r17 section 7.7.3.8.
 523          *
 524          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 525          *
 526          * Code      Description
 527          * 0h        Reserved
 528          * 1h        Relative port 1, historically known as port A
 529          * 2h        Relative port 2, historically known as port B
 530          * 3h to FFFFh    Relative port 3 through 65 535
 531          */
 532         port->sep_rtpi = dev->dev_rpti_counter++;
 533         if (!port->sep_rtpi)
 534                 goto again;
 535
 536         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 537                 /*
 538                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 539                  * for 16-bit wrap..
 540                  */
 541                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 542                         goto again;
 543         }
 544         spin_unlock(&dev->se_port_lock);
 545
 546         return port;
 547 }
 548
 549 static void core_export_port(
 550         struct se_device *dev,
 551         struct se_portal_group *tpg,
 552         struct se_port *port,
 553         struct se_lun *lun)
 554 {
 555         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 556         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 557
 558         spin_lock(&dev->se_port_lock);
 559         spin_lock(&lun->lun_sep_lock);
 560         port->sep_tpg = tpg;
 561         port->sep_lun = lun;
 562         lun->lun_sep = port;
 563         spin_unlock(&lun->lun_sep_lock);
 564
 565         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 566         spin_unlock(&dev->se_port_lock);
 567
 568         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 569                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 570                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 571                         pr_err("Unable to allocate t10_alua_tg_pt"
 572                                         "_gp_member_t\n");
 573                         return;
 574                 }
 575                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 576                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 577                         su_dev->t10_alua.default_tg_pt_gp);
 578                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 579                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 580                         " Group: alua/default_tg_pt_gp\n",
 581                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 582         }
 583
 584         dev->dev_port_count++;
 585         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 586 }
 587
 588 /*
 589  *      Called with struct se_device->se_port_lock spinlock held.
 590  */
 591 static void core_release_port(struct se_device *dev, struct se_port *port)
 592         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 593 {
 594         /*
 595          * Wait for any port reference for PR ALL_TG_PT=1 operation
 596          * to complete in __core_scsi3_alloc_registration()
 597          */
 598         spin_unlock(&dev->se_port_lock);
 599         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 600                 cpu_relax();
 601         spin_lock(&dev->se_port_lock);
 602
 603         core_alua_free_tg_pt_gp_mem(port);
 604
 605         list_del(&port->sep_list);
 606         dev->dev_port_count--;
 607         kfree(port);
 608 }
 609
 610 int core_dev_export(
 611         struct se_device *dev,
 612         struct se_portal_group *tpg,
 613         struct se_lun *lun)
 614 {
 615         struct se_port *port;
 616
 617         port = core_alloc_port(dev);
 618         if (IS_ERR(port))
 619                 return PTR_ERR(port);
 620
 621         lun->lun_se_dev = dev;
 622         se_dev_start(dev);
 623
 624         atomic_inc(&dev->dev_export_obj.obj_access_count);
 625         core_export_port(dev, tpg, port, lun);
 626         return 0;
 627 }
 628
 629 void core_dev_unexport(
 630         struct se_device *dev,
 631         struct se_portal_group *tpg,
 632         struct se_lun *lun)
 633 {
 634         struct se_port *port = lun->lun_sep;
 635
 636         spin_lock(&lun->lun_sep_lock);
 637         if (lun->lun_se_dev == NULL) {
 638                 spin_unlock(&lun->lun_sep_lock);
 639                 return;
 640         }
 641         spin_unlock(&lun->lun_sep_lock);
 642
 643         spin_lock(&dev->se_port_lock);
 644         atomic_dec(&dev->dev_export_obj.obj_access_count);
 645         core_release_port(dev, port);
 646         spin_unlock(&dev->se_port_lock);
 647
 648         se_dev_stop(dev);
 649         lun->lun_se_dev = NULL;
 650 }
 651
 652 int target_report_luns(struct se_task *se_task)
 653 {
 654         struct se_cmd *se_cmd = se_task->task_se_cmd;
 655         struct se_dev_entry *deve;
 656         struct se_lun *se_lun;
 657         struct se_session *se_sess = se_cmd->se_sess;
 658         unsigned char *buf;
 659         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 660
 661         buf = transport_kmap_first_data_page(se_cmd);
 662
 663         /*
 664          * If no struct se_session pointer is present, this struct se_cmd is
 665          * coming via a target_core_mod PASSTHROUGH op, and not through
 666          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 667          */
 668         if (!se_sess) {
 669                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 670                 lun_count = 1;
 671                 goto done;
 672         }
 673
 674         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 675         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 676                 deve = &se_sess->se_node_acl->device_list[i];
 677                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 678                         continue;
 679                 se_lun = deve->se_lun;
 680                 /*
 681                  * We determine the correct LUN LIST LENGTH even once we
 682                  * have reached the initial allocation length.
 683                  * See SPC2-R20 7.19.
 684                  */
 685                 lun_count++;
 686                 if ((cdb_offset + 8) >= se_cmd->data_length)
 687                         continue;
 688
 689                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 690                 offset += 8;
 691                 cdb_offset += 8;
 692         }
 693         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 694
 695         /*
 696          * See SPC3 r07, page 159.
 697          */
 698 done:
 699         transport_kunmap_first_data_page(se_cmd);
 700         lun_count *= 8;
 701         buf[0] = ((lun_count >> 24) & 0xff);
 702         buf[1] = ((lun_count >> 16) & 0xff);
 703         buf[2] = ((lun_count >> 8) & 0xff);
 704         buf[3] = (lun_count & 0xff);
 705
 706         se_task->task_scsi_status = GOOD;
 707         transport_complete_task(se_task, 1);
 708         return 0;
 709 }
 710
 711 /*      se_release_device_for_hba():
 712  *
 713  *
 714  */
 715 void se_release_device_for_hba(struct se_device *dev)
 716 {
 717         struct se_hba *hba = dev->se_hba;
 718
 719         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 720             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 721             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 722             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 723             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 724                 se_dev_stop(dev);
 725
 726         if (dev->dev_ptr) {
 727                 kthread_stop(dev->process_thread);
 728                 if (dev->transport->free_device)
 729                         dev->transport->free_device(dev->dev_ptr);
 730         }
 731
 732         spin_lock(&hba->device_lock);
 733         list_del(&dev->dev_list);
 734         hba->dev_count--;
 735         spin_unlock(&hba->device_lock);
 736
 737         core_scsi3_free_all_registrations(dev);
 738         se_release_vpd_for_dev(dev);
 739
 740         kfree(dev);
 741 }
 742
 743 void se_release_vpd_for_dev(struct se_device *dev)
 744 {
 745         struct t10_vpd *vpd, *vpd_tmp;
 746
 747         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 748         list_for_each_entry_safe(vpd, vpd_tmp,
 749                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 750                 list_del(&vpd->vpd_list);
 751                 kfree(vpd);
 752         }
 753         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 754 }
 755
 756 /*      se_free_virtual_device():
 757  *
 758  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 759  */
 760 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 761 {
 762         if (!list_empty(&dev->dev_sep_list))
 763                 dump_stack();
 764
 765         core_alua_free_lu_gp_mem(dev);
 766         se_release_device_for_hba(dev);
 767
 768         return 0;
 769 }
 770
 771 static void se_dev_start(struct se_device *dev)
 772 {
 773         struct se_hba *hba = dev->se_hba;
 774
 775         spin_lock(&hba->device_lock);
 776         atomic_inc(&dev->dev_obj.obj_access_count);
 777         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 778                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 779                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 780                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 781                 } else if (dev->dev_status &
 782                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 783                         dev->dev_status &=
 784                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 785                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 786                 }
 787         }
 788         spin_unlock(&hba->device_lock);
 789 }
 790
 791 static void se_dev_stop(struct se_device *dev)
 792 {
 793         struct se_hba *hba = dev->se_hba;
 794
 795         spin_lock(&hba->device_lock);
 796         atomic_dec(&dev->dev_obj.obj_access_count);
 797         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 798                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 799                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 800                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 801                 } else if (dev->dev_status &
 802                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 803                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 804                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 805                 }
 806         }
 807         spin_unlock(&hba->device_lock);
 808 }
 809
 810 int se_dev_check_online(struct se_device *dev)
 811 {
 812         unsigned long flags;
 813         int ret;
 814
 815         spin_lock_irqsave(&dev->dev_status_lock, flags);
 816         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 817                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 818         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 819
 820         return ret;
 821 }
 822
 823 int se_dev_check_shutdown(struct se_device *dev)
 824 {
 825         int ret;
 826
 827         spin_lock_irq(&dev->dev_status_lock);
 828         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 829         spin_unlock_irq(&dev->dev_status_lock);
 830
 831         return ret;
 832 }
 833
 834 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 835 {
 836         u32 tmp, aligned_max_sectors;
 837         /*
 838          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 839          * transport_allocate_data_tasks() operation.
 840          */
 841         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 842         aligned_max_sectors = (tmp / block_size);
 843         if (max_sectors != aligned_max_sectors) {
 844                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 845                                 " to %u\n", max_sectors, aligned_max_sectors);
 846                 return aligned_max_sectors;
 847         }
 848
 849         return max_sectors;
 850 }
 851
 852 void se_dev_set_default_attribs(
 853         struct se_device *dev,
 854         struct se_dev_limits *dev_limits)
 855 {
 856         struct queue_limits *limits = &dev_limits->limits;
 857
 858         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 859         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 860         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 861         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 862         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 863         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 864         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 865         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 866         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 867         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 868         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 869         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 870         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 871         /*
 872          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 873          * iblock_create_virtdevice() from struct queue_limits values
 874          * if blk_queue_discard()==1
 875          */
 876         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 877         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 878                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 879         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 880         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 881                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 882         /*
 883          * block_size is based on subsystem plugin dependent requirements.
 884          */
 885         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 886         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 887         /*
 888          * max_sectors is based on subsystem plugin dependent requirements.
 889          */
 890         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 891         /*
 892          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
 893          */
 894         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
 895                                                 limits->logical_block_size);
 896         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 897         /*
 898          * Set optimal_sectors from max_sectors, which can be lowered via
 899          * configfs.
 900          */
 901         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
 902         /*
 903          * queue_depth is based on subsystem plugin dependent requirements.
 904          */
 905         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 906         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 907 }
 908
 909 int se_dev_set_max_unmap_lba_count(
 910         struct se_device *dev,
 911         u32 max_unmap_lba_count)
 912 {
 913         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 914         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 915                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 916         return 0;
 917 }
 918
 919 int se_dev_set_max_unmap_block_desc_count(
 920         struct se_device *dev,
 921         u32 max_unmap_block_desc_count)
 922 {
 923         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 924                 max_unmap_block_desc_count;
 925         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 926                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 927         return 0;
 928 }
 929
 930 int se_dev_set_unmap_granularity(
 931         struct se_device *dev,
 932         u32 unmap_granularity)
 933 {
 934         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 935         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 936                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 937         return 0;
 938 }
 939
 940 int se_dev_set_unmap_granularity_alignment(
 941         struct se_device *dev,
 942         u32 unmap_granularity_alignment)
 943 {
 944         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 945         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 946                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 947         return 0;
 948 }
 949
 950 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 951 {
 952         if (flag != 0 && flag != 1) {
 953                 pr_err("Illegal value %d\n", flag);
 954                 return -EINVAL;
 955         }
 956
 957         if (flag) {
 958                 pr_err("dpo_emulated not supported\n");
 959                 return -EINVAL;
 960         }
 961
 962         return 0;
 963 }
 964
 965 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 966 {
 967         if (flag != 0 && flag != 1) {
 968                 pr_err("Illegal value %d\n", flag);
 969                 return -EINVAL;
 970         }
 971
 972         if (flag && dev->transport->fua_write_emulated == 0) {
 973                 pr_err("fua_write_emulated not supported\n");
 974                 return -EINVAL;
 975         }
 976         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 977         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 978                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 979         return 0;
 980 }
 981
 982 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 983 {
 984         if (flag != 0 && flag != 1) {
 985                 pr_err("Illegal value %d\n", flag);
 986                 return -EINVAL;
 987         }
 988
 989         if (flag) {
 990                 pr_err("ua read emulated not supported\n");
 991                 return -EINVAL;
 992         }
 993
 994         return 0;
 995 }
 996
 997 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 998 {
 999         if (flag != 0 && flag != 1) {
1000                 pr_err("Illegal value %d\n", flag);
1001                 return -EINVAL;
1002         }
1003         if (flag && dev->transport->write_cache_emulated == 0) {
1004                 pr_err("write_cache_emulated not supported\n");
1005                 return -EINVAL;
1006         }
1007         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1008         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1009                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1010         return 0;
1011 }
1012
1013 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1014 {
1015         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1016                 pr_err("Illegal value %d\n", flag);
1017                 return -EINVAL;
1018         }
1019
1020         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1021                 pr_err("dev[%p]: Unable to change SE Device"
1022                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1023                         " exists\n", dev,
1024                         atomic_read(&dev->dev_export_obj.obj_access_count));
1025                 return -EINVAL;
1026         }
1027         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1028         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1029                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1030
1031         return 0;
1032 }
1033
1034 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1035 {
1036         if ((flag != 0) && (flag != 1)) {
1037                 pr_err("Illegal value %d\n", flag);
1038                 return -EINVAL;
1039         }
1040
1041         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1042                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1043                         " dev_export_obj: %d count exists\n", dev,
1044                         atomic_read(&dev->dev_export_obj.obj_access_count));
1045                 return -EINVAL;
1046         }
1047         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1048         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1049                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1050
1051         return 0;
1052 }
1053
1054 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1055 {
1056         if ((flag != 0) && (flag != 1)) {
1057                 pr_err("Illegal value %d\n", flag);
1058                 return -EINVAL;
1059         }
1060         /*
1061          * We expect this value to be non-zero when generic Block Layer
1062          * Discard supported is detected iblock_create_virtdevice().
1063          */
1064         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1065                 pr_err("Generic Block Discard not supported\n");
1066                 return -ENOSYS;
1067         }
1068
1069         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1070         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1071                                 dev, flag);
1072         return 0;
1073 }
1074
1075 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1076 {
1077         if ((flag != 0) && (flag != 1)) {
1078                 pr_err("Illegal value %d\n", flag);
1079                 return -EINVAL;
1080         }
1081         /*
1082          * We expect this value to be non-zero when generic Block Layer
1083          * Discard supported is detected iblock_create_virtdevice().
1084          */
1085         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1086                 pr_err("Generic Block Discard not supported\n");
1087                 return -ENOSYS;
1088         }
1089
1090         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1091         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1092                                 dev, flag);
1093         return 0;
1094 }
1095
1096 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1097 {
1098         if ((flag != 0) && (flag != 1)) {
1099                 pr_err("Illegal value %d\n", flag);
1100                 return -EINVAL;
1101         }
1102         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1103         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1104                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1105         return 0;
1106 }
1107
1108 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1109 {
1110         if ((flag != 0) && (flag != 1)) {
1111                 printk(KERN_ERR "Illegal value %d\n", flag);
1112                 return -EINVAL;
1113         }
1114         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1115         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1116                dev, flag);
1117         return 0;
1118 }
1119
1120 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1121 {
1122         if (flag != 0) {
1123                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1124                         " reordering not implemented\n", dev);
1125                 return -ENOSYS;
1126         }
1127         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1128         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1129         return 0;
1130 }
1131
1132 /*
1133  * Note, this can only be called on unexported SE Device Object.
1134  */
1135 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1136 {
1137         u32 orig_queue_depth = dev->queue_depth;
1138
1139         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1140                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1141                         " dev_export_obj: %d count exists\n", dev,
1142                         atomic_read(&dev->dev_export_obj.obj_access_count));
1143                 return -EINVAL;
1144         }
1145         if (!queue_depth) {
1146                 pr_err("dev[%p]: Illegal ZERO value for queue"
1147                         "_depth\n", dev);
1148                 return -EINVAL;
1149         }
1150
1151         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1152                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1153                         pr_err("dev[%p]: Passed queue_depth: %u"
1154                                 " exceeds TCM/SE_Device TCQ: %u\n",
1155                                 dev, queue_depth,
1156                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1157                         return -EINVAL;
1158                 }
1159         } else {
1160                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1161                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1162                                 pr_err("dev[%p]: Passed queue_depth:"
1163                                         " %u exceeds TCM/SE_Device MAX"
1164                                         " TCQ: %u\n", dev, queue_depth,
1165                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1166                                 return -EINVAL;
1167                         }
1168                 }
1169         }
1170
1171         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1172         if (queue_depth > orig_queue_depth)
1173                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1174         else if (queue_depth < orig_queue_depth)
1175                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1176
1177         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1178                         dev, queue_depth);
1179         return 0;
1180 }
1181
1182 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1183 {
1184         int force = 0; /* Force setting for VDEVS */
1185
1186         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1187                 pr_err("dev[%p]: Unable to change SE Device"
1188                         " max_sectors while dev_export_obj: %d count exists\n",
1189                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1190                 return -EINVAL;
1191         }
1192         if (!max_sectors) {
1193                 pr_err("dev[%p]: Illegal ZERO value for"
1194                         " max_sectors\n", dev);
1195                 return -EINVAL;
1196         }
1197         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1198                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1199                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1200                                 DA_STATUS_MAX_SECTORS_MIN);
1201                 return -EINVAL;
1202         }
1203         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1204                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1205                         pr_err("dev[%p]: Passed max_sectors: %u"
1206                                 " greater than TCM/SE_Device max_sectors:"
1207                                 " %u\n", dev, max_sectors,
1208                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1209                          return -EINVAL;
1210                 }
1211         } else {
1212                 if (!force && (max_sectors >
1213                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1214                         pr_err("dev[%p]: Passed max_sectors: %u"
1215                                 " greater than TCM/SE_Device max_sectors"
1216                                 ": %u, use force=1 to override.\n", dev,
1217                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1218                         return -EINVAL;
1219                 }
1220                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1221                         pr_err("dev[%p]: Passed max_sectors: %u"
1222                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1223                                 " %u\n", dev, max_sectors,
1224                                 DA_STATUS_MAX_SECTORS_MAX);
1225                         return -EINVAL;
1226                 }
1227         }
1228         /*
1229          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1230          */
1231         max_sectors = se_dev_align_max_sectors(max_sectors,
1232                                 dev->se_sub_dev->se_dev_attrib.block_size);
1233
1234         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1235         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1236                         dev, max_sectors);
1237         return 0;
1238 }
1239
1240 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1241 {
1242         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1243                 pr_err("dev[%p]: Unable to change SE Device"
1244                         " optimal_sectors while dev_export_obj: %d count exists\n",
1245                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1246                 return -EINVAL;
1247         }
1248         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1249                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1250                                 " changed for TCM/pSCSI\n", dev);
1251                 return -EINVAL;
1252         }
1253         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1254                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1255                         " greater than max_sectors: %u\n", dev,
1256                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1257                 return -EINVAL;
1258         }
1259
1260         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1261         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1262                         dev, optimal_sectors);
1263         return 0;
1264 }
1265
1266 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1267 {
1268         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1269                 pr_err("dev[%p]: Unable to change SE Device block_size"
1270                         " while dev_export_obj: %d count exists\n", dev,
1271                         atomic_read(&dev->dev_export_obj.obj_access_count));
1272                 return -EINVAL;
1273         }
1274
1275         if ((block_size != 512) &&
1276             (block_size != 1024) &&
1277             (block_size != 2048) &&
1278             (block_size != 4096)) {
1279                 pr_err("dev[%p]: Illegal value for block_device: %u"
1280                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1281                         dev, block_size);
1282                 return -EINVAL;
1283         }
1284
1285         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1286                 pr_err("dev[%p]: Not allowed to change block_size for"
1287                         " Physical Device, use for Linux/SCSI to change"
1288                         " block_size for underlying hardware\n", dev);
1289                 return -EINVAL;
1290         }
1291
1292         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1293         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1294                         dev, block_size);
1295         return 0;
1296 }
1297
1298 struct se_lun *core_dev_add_lun(
1299         struct se_portal_group *tpg,
1300         struct se_hba *hba,
1301         struct se_device *dev,
1302         u32 lun)
1303 {
1304         struct se_lun *lun_p;
1305         u32 lun_access = 0;
1306
1307         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1308                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1309                         atomic_read(&dev->dev_access_obj.obj_access_count));
1310                 return NULL;
1311         }
1312
1313         lun_p = core_tpg_pre_addlun(tpg, lun);
1314         if ((IS_ERR(lun_p)) || !lun_p)
1315                 return NULL;
1316
1317         if (dev->dev_flags & DF_READ_ONLY)
1318                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1319         else
1320                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1321
1322         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1323                 return NULL;
1324
1325         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1326                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1327                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1328                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1329         /*
1330          * Update LUN maps for dynamically added initiators when
1331          * generate_node_acl is enabled.
1332          */
1333         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1334                 struct se_node_acl *acl;
1335                 spin_lock_irq(&tpg->acl_node_lock);
1336                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1337                         if (acl->dynamic_node_acl &&
1338                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1339                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1340                                 spin_unlock_irq(&tpg->acl_node_lock);
1341                                 core_tpg_add_node_to_devs(acl, tpg);
1342                                 spin_lock_irq(&tpg->acl_node_lock);
1343                         }
1344                 }
1345                 spin_unlock_irq(&tpg->acl_node_lock);
1346         }
1347
1348         return lun_p;
1349 }
1350
1351 /*      core_dev_del_lun():
1352  *
1353  *
1354  */
1355 int core_dev_del_lun(
1356         struct se_portal_group *tpg,
1357         u32 unpacked_lun)
1358 {
1359         struct se_lun *lun;
1360         int ret = 0;
1361
1362         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1363         if (!lun)
1364                 return ret;
1365
1366         core_tpg_post_dellun(tpg, lun);
1367
1368         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1369                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1370                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1371                 tpg->se_tpg_tfo->get_fabric_name());
1372
1373         return 0;
1374 }
1375
1376 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1377 {
1378         struct se_lun *lun;
1379
1380         spin_lock(&tpg->tpg_lun_lock);
1381         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1382                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1383                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1384                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1385                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1386                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1387                 spin_unlock(&tpg->tpg_lun_lock);
1388                 return NULL;
1389         }
1390         lun = &tpg->tpg_lun_list[unpacked_lun];
1391
1392         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1393                 pr_err("%s Logical Unit Number: %u is not free on"
1394                         " Target Portal Group: %hu, ignoring request.\n",
1395                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1396                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1397                 spin_unlock(&tpg->tpg_lun_lock);
1398                 return NULL;
1399         }
1400         spin_unlock(&tpg->tpg_lun_lock);
1401
1402         return lun;
1403 }
1404
1405 /*      core_dev_get_lun():
1406  *
1407  *
1408  */
1409 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1410 {
1411         struct se_lun *lun;
1412
1413         spin_lock(&tpg->tpg_lun_lock);
1414         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1415                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1416                         "_TPG-1: %u for Target Portal Group: %hu\n",
1417                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1418                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1419                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1420                 spin_unlock(&tpg->tpg_lun_lock);
1421                 return NULL;
1422         }
1423         lun = &tpg->tpg_lun_list[unpacked_lun];
1424
1425         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1426                 pr_err("%s Logical Unit Number: %u is not active on"
1427                         " Target Portal Group: %hu, ignoring request.\n",
1428                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1429                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1430                 spin_unlock(&tpg->tpg_lun_lock);
1431                 return NULL;
1432         }
1433         spin_unlock(&tpg->tpg_lun_lock);
1434
1435         return lun;
1436 }
1437
1438 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1439         struct se_portal_group *tpg,
1440         u32 mapped_lun,
1441         char *initiatorname,
1442         int *ret)
1443 {
1444         struct se_lun_acl *lacl;
1445         struct se_node_acl *nacl;
1446
1447         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1448                 pr_err("%s InitiatorName exceeds maximum size.\n",
1449                         tpg->se_tpg_tfo->get_fabric_name());
1450                 *ret = -EOVERFLOW;
1451                 return NULL;
1452         }
1453         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1454         if (!nacl) {
1455                 *ret = -EINVAL;
1456                 return NULL;
1457         }
1458         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1459         if (!lacl) {
1460                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1461                 *ret = -ENOMEM;
1462                 return NULL;
1463         }
1464
1465         INIT_LIST_HEAD(&lacl->lacl_list);
1466         lacl->mapped_lun = mapped_lun;
1467         lacl->se_lun_nacl = nacl;
1468         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1469
1470         return lacl;
1471 }
1472
1473 int core_dev_add_initiator_node_lun_acl(
1474         struct se_portal_group *tpg,
1475         struct se_lun_acl *lacl,
1476         u32 unpacked_lun,
1477         u32 lun_access)
1478 {
1479         struct se_lun *lun;
1480         struct se_node_acl *nacl;
1481
1482         lun = core_dev_get_lun(tpg, unpacked_lun);
1483         if (!lun) {
1484                 pr_err("%s Logical Unit Number: %u is not active on"
1485                         " Target Portal Group: %hu, ignoring request.\n",
1486                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1487                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1488                 return -EINVAL;
1489         }
1490
1491         nacl = lacl->se_lun_nacl;
1492         if (!nacl)
1493                 return -EINVAL;
1494
1495         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1496             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1497                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1498
1499         lacl->se_lun = lun;
1500
1501         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1502                         lun_access, nacl, tpg, 1) < 0)
1503                 return -EINVAL;
1504
1505         spin_lock(&lun->lun_acl_lock);
1506         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1507         atomic_inc(&lun->lun_acl_count);
1508         smp_mb__after_atomic_inc();
1509         spin_unlock(&lun->lun_acl_lock);
1510
1511         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1512                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1513                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1514                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1515                 lacl->initiatorname);
1516         /*
1517          * Check to see if there are any existing persistent reservation APTPL
1518          * pre-registrations that need to be enabled for this LUN ACL..
1519          */
1520         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1521         return 0;
1522 }
1523
1524 /*      core_dev_del_initiator_node_lun_acl():
1525  *
1526  *
1527  */
1528 int core_dev_del_initiator_node_lun_acl(
1529         struct se_portal_group *tpg,
1530         struct se_lun *lun,
1531         struct se_lun_acl *lacl)
1532 {
1533         struct se_node_acl *nacl;
1534
1535         nacl = lacl->se_lun_nacl;
1536         if (!nacl)
1537                 return -EINVAL;
1538
1539         spin_lock(&lun->lun_acl_lock);
1540         list_del(&lacl->lacl_list);
1541         atomic_dec(&lun->lun_acl_count);
1542         smp_mb__after_atomic_dec();
1543         spin_unlock(&lun->lun_acl_lock);
1544
1545         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1546                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1547
1548         lacl->se_lun = NULL;
1549
1550         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1551                 " InitiatorNode: %s Mapped LUN: %u\n",
1552                 tpg->se_tpg_tfo->get_fabric_name(),
1553                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1554                 lacl->initiatorname, lacl->mapped_lun);
1555
1556         return 0;
1557 }
1558
1559 void core_dev_free_initiator_node_lun_acl(
1560         struct se_portal_group *tpg,
1561         struct se_lun_acl *lacl)
1562 {
1563         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1564                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1565                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1566                 tpg->se_tpg_tfo->get_fabric_name(),
1567                 lacl->initiatorname, lacl->mapped_lun);
1568
1569         kfree(lacl);
1570 }
1571
1572 int core_dev_setup_virtual_lun0(void)
1573 {
1574         struct se_hba *hba;
1575         struct se_device *dev;
1576         struct se_subsystem_dev *se_dev = NULL;
1577         struct se_subsystem_api *t;
1578         char buf[16];
1579         int ret;
1580
1581         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1582         if (IS_ERR(hba))
1583                 return PTR_ERR(hba);
1584
1585         lun0_hba = hba;
1586         t = hba->transport;
1587
1588         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1589         if (!se_dev) {
1590                 pr_err("Unable to allocate memory for"
1591                                 " struct se_subsystem_dev\n");
1592                 ret = -ENOMEM;
1593                 goto out;
1594         }
1595         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1596         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1597         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1598         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1599         spin_lock_init(&se_dev->t10_pr.registration_lock);
1600         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1601         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1602         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1603         spin_lock_init(&se_dev->se_dev_lock);
1604         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1605         se_dev->t10_wwn.t10_sub_dev = se_dev;
1606         se_dev->t10_alua.t10_sub_dev = se_dev;
1607         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1608         se_dev->se_dev_hba = hba;
1609
1610         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1611         if (!se_dev->se_dev_su_ptr) {
1612                 pr_err("Unable to locate subsystem dependent pointer"
1613                         " from allocate_virtdevice()\n");
1614                 ret = -ENOMEM;
1615                 goto out;
1616         }
1617         lun0_su_dev = se_dev;
1618
1619         memset(buf, 0, 16);
1620         sprintf(buf, "rd_pages=8");
1621         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1622
1623         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1624         if (IS_ERR(dev)) {
1625                 ret = PTR_ERR(dev);
1626                 goto out;
1627         }
1628         se_dev->se_dev_ptr = dev;
1629         g_lun0_dev = dev;
1630
1631         return 0;
1632 out:
1633         lun0_su_dev = NULL;
1634         kfree(se_dev);
1635         if (lun0_hba) {
1636                 core_delete_hba(lun0_hba);
1637                 lun0_hba = NULL;
1638         }
1639         return ret;
1640 }
1641
1642
1643 void core_dev_release_virtual_lun0(void)
1644 {
1645         struct se_hba *hba = lun0_hba;
1646         struct se_subsystem_dev *su_dev = lun0_su_dev;
1647
1648         if (!hba)
1649                 return;
1650
1651         if (g_lun0_dev)
1652                 se_free_virtual_device(g_lun0_dev, hba);
1653
1654         kfree(su_dev);
1655         core_delete_hba(hba);
1656 }