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_sep = NULL;
 650         lun->lun_se_dev = NULL;
 651 }
 652
 653 int target_report_luns(struct se_task *se_task)
 654 {
 655         struct se_cmd *se_cmd = se_task->task_se_cmd;
 656         struct se_dev_entry *deve;
 657         struct se_lun *se_lun;
 658         struct se_session *se_sess = se_cmd->se_sess;
 659         unsigned char *buf;
 660         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 661
 662         buf = transport_kmap_data_sg(se_cmd);
 663         if (!buf)
 664                 return -ENOMEM;
 665
 666         /*
 667          * If no struct se_session pointer is present, this struct se_cmd is
 668          * coming via a target_core_mod PASSTHROUGH op, and not through
 669          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 670          */
 671         if (!se_sess)
 672                 goto done;
 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         /*
 700          * If no LUNs are accessible, report virtual LUN 0.
 701          */
 702         if (lun_count == 0) {
 703                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 704                 lun_count = 1;
 705         }
 706
 707         lun_count *= 8;
 708         buf[0] = ((lun_count >> 24) & 0xff);
 709         buf[1] = ((lun_count >> 16) & 0xff);
 710         buf[2] = ((lun_count >> 8) & 0xff);
 711         buf[3] = (lun_count & 0xff);
 712         transport_kunmap_data_sg(se_cmd);
 713
 714         se_task->task_scsi_status = GOOD;
 715         transport_complete_task(se_task, 1);
 716         return 0;
 717 }
 718
 719 /*      se_release_device_for_hba():
 720  *
 721  *
 722  */
 723 void se_release_device_for_hba(struct se_device *dev)
 724 {
 725         struct se_hba *hba = dev->se_hba;
 726
 727         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 728             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 729             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 730             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 731             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 732                 se_dev_stop(dev);
 733
 734         if (dev->dev_ptr) {
 735                 kthread_stop(dev->process_thread);
 736                 if (dev->transport->free_device)
 737                         dev->transport->free_device(dev->dev_ptr);
 738         }
 739
 740         spin_lock(&hba->device_lock);
 741         list_del(&dev->dev_list);
 742         hba->dev_count--;
 743         spin_unlock(&hba->device_lock);
 744
 745         core_scsi3_free_all_registrations(dev);
 746         se_release_vpd_for_dev(dev);
 747
 748         kfree(dev);
 749 }
 750
 751 void se_release_vpd_for_dev(struct se_device *dev)
 752 {
 753         struct t10_vpd *vpd, *vpd_tmp;
 754
 755         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 756         list_for_each_entry_safe(vpd, vpd_tmp,
 757                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 758                 list_del(&vpd->vpd_list);
 759                 kfree(vpd);
 760         }
 761         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 762 }
 763
 764 /*      se_free_virtual_device():
 765  *
 766  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 767  */
 768 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 769 {
 770         if (!list_empty(&dev->dev_sep_list))
 771                 dump_stack();
 772
 773         core_alua_free_lu_gp_mem(dev);
 774         se_release_device_for_hba(dev);
 775
 776         return 0;
 777 }
 778
 779 static void se_dev_start(struct se_device *dev)
 780 {
 781         struct se_hba *hba = dev->se_hba;
 782
 783         spin_lock(&hba->device_lock);
 784         atomic_inc(&dev->dev_obj.obj_access_count);
 785         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 786                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 787                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 788                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 789                 } else if (dev->dev_status &
 790                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 791                         dev->dev_status &=
 792                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 793                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 794                 }
 795         }
 796         spin_unlock(&hba->device_lock);
 797 }
 798
 799 static void se_dev_stop(struct se_device *dev)
 800 {
 801         struct se_hba *hba = dev->se_hba;
 802
 803         spin_lock(&hba->device_lock);
 804         atomic_dec(&dev->dev_obj.obj_access_count);
 805         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 806                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 807                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 808                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 809                 } else if (dev->dev_status &
 810                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 811                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 812                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 813                 }
 814         }
 815         spin_unlock(&hba->device_lock);
 816 }
 817
 818 int se_dev_check_online(struct se_device *dev)
 819 {
 820         unsigned long flags;
 821         int ret;
 822
 823         spin_lock_irqsave(&dev->dev_status_lock, flags);
 824         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 825                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 826         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 827
 828         return ret;
 829 }
 830
 831 int se_dev_check_shutdown(struct se_device *dev)
 832 {
 833         int ret;
 834
 835         spin_lock_irq(&dev->dev_status_lock);
 836         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 837         spin_unlock_irq(&dev->dev_status_lock);
 838
 839         return ret;
 840 }
 841
 842 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 843 {
 844         u32 aligned_max_sectors;
 845         u32 alignment;
 846         /*
 847          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 848          * transport_allocate_data_tasks() operation.
 849          */
 850         alignment = max(1ul, PAGE_SIZE / block_size);
 851         aligned_max_sectors = rounddown(max_sectors, alignment);
 852
 853         if (max_sectors != aligned_max_sectors)
 854                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 855                         max_sectors, aligned_max_sectors);
 856
 857         return aligned_max_sectors;
 858 }
 859
 860 void se_dev_set_default_attribs(
 861         struct se_device *dev,
 862         struct se_dev_limits *dev_limits)
 863 {
 864         struct queue_limits *limits = &dev_limits->limits;
 865
 866         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 867         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 868         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 869         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 870         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 871         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 872         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 873         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 874         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 875         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 876         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 877         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 878         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 879         /*
 880          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 881          * iblock_create_virtdevice() from struct queue_limits values
 882          * if blk_queue_discard()==1
 883          */
 884         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 885         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 886                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 887         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 888         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 889                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 890         /*
 891          * block_size is based on subsystem plugin dependent requirements.
 892          */
 893         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 894         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 895         /*
 896          * max_sectors is based on subsystem plugin dependent requirements.
 897          */
 898         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 899         /*
 900          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
 901          */
 902         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
 903                                                 limits->logical_block_size);
 904         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 905         /*
 906          * Set optimal_sectors from max_sectors, which can be lowered via
 907          * configfs.
 908          */
 909         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
 910         /*
 911          * queue_depth is based on subsystem plugin dependent requirements.
 912          */
 913         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 914         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 915 }
 916
 917 int se_dev_set_max_unmap_lba_count(
 918         struct se_device *dev,
 919         u32 max_unmap_lba_count)
 920 {
 921         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 922         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 923                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 924         return 0;
 925 }
 926
 927 int se_dev_set_max_unmap_block_desc_count(
 928         struct se_device *dev,
 929         u32 max_unmap_block_desc_count)
 930 {
 931         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 932                 max_unmap_block_desc_count;
 933         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 934                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 935         return 0;
 936 }
 937
 938 int se_dev_set_unmap_granularity(
 939         struct se_device *dev,
 940         u32 unmap_granularity)
 941 {
 942         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 943         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 944                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 945         return 0;
 946 }
 947
 948 int se_dev_set_unmap_granularity_alignment(
 949         struct se_device *dev,
 950         u32 unmap_granularity_alignment)
 951 {
 952         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 953         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 954                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 955         return 0;
 956 }
 957
 958 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 959 {
 960         if (flag != 0 && flag != 1) {
 961                 pr_err("Illegal value %d\n", flag);
 962                 return -EINVAL;
 963         }
 964
 965         if (flag) {
 966                 pr_err("dpo_emulated not supported\n");
 967                 return -EINVAL;
 968         }
 969
 970         return 0;
 971 }
 972
 973 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 974 {
 975         if (flag != 0 && flag != 1) {
 976                 pr_err("Illegal value %d\n", flag);
 977                 return -EINVAL;
 978         }
 979
 980         if (flag && dev->transport->fua_write_emulated == 0) {
 981                 pr_err("fua_write_emulated not supported\n");
 982                 return -EINVAL;
 983         }
 984         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 985         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 986                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 987         return 0;
 988 }
 989
 990 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 991 {
 992         if (flag != 0 && flag != 1) {
 993                 pr_err("Illegal value %d\n", flag);
 994                 return -EINVAL;
 995         }
 996
 997         if (flag) {
 998                 pr_err("ua read emulated not supported\n");
 999                 return -EINVAL;
1000         }
1001
1002         return 0;
1003 }
1004
1005 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1006 {
1007         if (flag != 0 && flag != 1) {
1008                 pr_err("Illegal value %d\n", flag);
1009                 return -EINVAL;
1010         }
1011         if (flag && dev->transport->write_cache_emulated == 0) {
1012                 pr_err("write_cache_emulated not supported\n");
1013                 return -EINVAL;
1014         }
1015         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1016         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1017                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1018         return 0;
1019 }
1020
1021 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1022 {
1023         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1024                 pr_err("Illegal value %d\n", flag);
1025                 return -EINVAL;
1026         }
1027
1028         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1029                 pr_err("dev[%p]: Unable to change SE Device"
1030                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1031                         " exists\n", dev,
1032                         atomic_read(&dev->dev_export_obj.obj_access_count));
1033                 return -EINVAL;
1034         }
1035         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1036         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1037                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1038
1039         return 0;
1040 }
1041
1042 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1043 {
1044         if ((flag != 0) && (flag != 1)) {
1045                 pr_err("Illegal value %d\n", flag);
1046                 return -EINVAL;
1047         }
1048
1049         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1050                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1051                         " dev_export_obj: %d count exists\n", dev,
1052                         atomic_read(&dev->dev_export_obj.obj_access_count));
1053                 return -EINVAL;
1054         }
1055         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1056         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1057                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1058
1059         return 0;
1060 }
1061
1062 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1063 {
1064         if ((flag != 0) && (flag != 1)) {
1065                 pr_err("Illegal value %d\n", flag);
1066                 return -EINVAL;
1067         }
1068         /*
1069          * We expect this value to be non-zero when generic Block Layer
1070          * Discard supported is detected iblock_create_virtdevice().
1071          */
1072         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1073                 pr_err("Generic Block Discard not supported\n");
1074                 return -ENOSYS;
1075         }
1076
1077         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1078         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1079                                 dev, flag);
1080         return 0;
1081 }
1082
1083 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1084 {
1085         if ((flag != 0) && (flag != 1)) {
1086                 pr_err("Illegal value %d\n", flag);
1087                 return -EINVAL;
1088         }
1089         /*
1090          * We expect this value to be non-zero when generic Block Layer
1091          * Discard supported is detected iblock_create_virtdevice().
1092          */
1093         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1094                 pr_err("Generic Block Discard not supported\n");
1095                 return -ENOSYS;
1096         }
1097
1098         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1099         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1100                                 dev, flag);
1101         return 0;
1102 }
1103
1104 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1105 {
1106         if ((flag != 0) && (flag != 1)) {
1107                 pr_err("Illegal value %d\n", flag);
1108                 return -EINVAL;
1109         }
1110         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1111         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1112                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1113         return 0;
1114 }
1115
1116 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1117 {
1118         if ((flag != 0) && (flag != 1)) {
1119                 printk(KERN_ERR "Illegal value %d\n", flag);
1120                 return -EINVAL;
1121         }
1122         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1123         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1124                dev, flag);
1125         return 0;
1126 }
1127
1128 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1129 {
1130         if (flag != 0) {
1131                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1132                         " reordering not implemented\n", dev);
1133                 return -ENOSYS;
1134         }
1135         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1136         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1137         return 0;
1138 }
1139
1140 /*
1141  * Note, this can only be called on unexported SE Device Object.
1142  */
1143 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1144 {
1145         u32 orig_queue_depth = dev->queue_depth;
1146
1147         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1148                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1149                         " dev_export_obj: %d count exists\n", dev,
1150                         atomic_read(&dev->dev_export_obj.obj_access_count));
1151                 return -EINVAL;
1152         }
1153         if (!queue_depth) {
1154                 pr_err("dev[%p]: Illegal ZERO value for queue"
1155                         "_depth\n", dev);
1156                 return -EINVAL;
1157         }
1158
1159         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1160                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1161                         pr_err("dev[%p]: Passed queue_depth: %u"
1162                                 " exceeds TCM/SE_Device TCQ: %u\n",
1163                                 dev, queue_depth,
1164                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1165                         return -EINVAL;
1166                 }
1167         } else {
1168                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1169                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1170                                 pr_err("dev[%p]: Passed queue_depth:"
1171                                         " %u exceeds TCM/SE_Device MAX"
1172                                         " TCQ: %u\n", dev, queue_depth,
1173                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1174                                 return -EINVAL;
1175                         }
1176                 }
1177         }
1178
1179         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1180         if (queue_depth > orig_queue_depth)
1181                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1182         else if (queue_depth < orig_queue_depth)
1183                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1184
1185         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1186                         dev, queue_depth);
1187         return 0;
1188 }
1189
1190 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1191 {
1192         int force = 0; /* Force setting for VDEVS */
1193
1194         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1195                 pr_err("dev[%p]: Unable to change SE Device"
1196                         " max_sectors while dev_export_obj: %d count exists\n",
1197                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1198                 return -EINVAL;
1199         }
1200         if (!max_sectors) {
1201                 pr_err("dev[%p]: Illegal ZERO value for"
1202                         " max_sectors\n", dev);
1203                 return -EINVAL;
1204         }
1205         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1206                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1207                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1208                                 DA_STATUS_MAX_SECTORS_MIN);
1209                 return -EINVAL;
1210         }
1211         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1212                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1213                         pr_err("dev[%p]: Passed max_sectors: %u"
1214                                 " greater than TCM/SE_Device max_sectors:"
1215                                 " %u\n", dev, max_sectors,
1216                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1217                          return -EINVAL;
1218                 }
1219         } else {
1220                 if (!force && (max_sectors >
1221                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1222                         pr_err("dev[%p]: Passed max_sectors: %u"
1223                                 " greater than TCM/SE_Device max_sectors"
1224                                 ": %u, use force=1 to override.\n", dev,
1225                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1226                         return -EINVAL;
1227                 }
1228                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1229                         pr_err("dev[%p]: Passed max_sectors: %u"
1230                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1231                                 " %u\n", dev, max_sectors,
1232                                 DA_STATUS_MAX_SECTORS_MAX);
1233                         return -EINVAL;
1234                 }
1235         }
1236         /*
1237          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1238          */
1239         max_sectors = se_dev_align_max_sectors(max_sectors,
1240                                 dev->se_sub_dev->se_dev_attrib.block_size);
1241
1242         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1243         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1244                         dev, max_sectors);
1245         return 0;
1246 }
1247
1248 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1249 {
1250         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1251                 pr_err("dev[%p]: Unable to change SE Device"
1252                         " optimal_sectors while dev_export_obj: %d count exists\n",
1253                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1254                 return -EINVAL;
1255         }
1256         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1257                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1258                                 " changed for TCM/pSCSI\n", dev);
1259                 return -EINVAL;
1260         }
1261         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1262                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1263                         " greater than max_sectors: %u\n", dev,
1264                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1265                 return -EINVAL;
1266         }
1267
1268         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1269         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1270                         dev, optimal_sectors);
1271         return 0;
1272 }
1273
1274 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1275 {
1276         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1277                 pr_err("dev[%p]: Unable to change SE Device block_size"
1278                         " while dev_export_obj: %d count exists\n", dev,
1279                         atomic_read(&dev->dev_export_obj.obj_access_count));
1280                 return -EINVAL;
1281         }
1282
1283         if ((block_size != 512) &&
1284             (block_size != 1024) &&
1285             (block_size != 2048) &&
1286             (block_size != 4096)) {
1287                 pr_err("dev[%p]: Illegal value for block_device: %u"
1288                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1289                         dev, block_size);
1290                 return -EINVAL;
1291         }
1292
1293         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1294                 pr_err("dev[%p]: Not allowed to change block_size for"
1295                         " Physical Device, use for Linux/SCSI to change"
1296                         " block_size for underlying hardware\n", dev);
1297                 return -EINVAL;
1298         }
1299
1300         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1301         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1302                         dev, block_size);
1303         return 0;
1304 }
1305
1306 struct se_lun *core_dev_add_lun(
1307         struct se_portal_group *tpg,
1308         struct se_hba *hba,
1309         struct se_device *dev,
1310         u32 lun)
1311 {
1312         struct se_lun *lun_p;
1313         u32 lun_access = 0;
1314
1315         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1316                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1317                         atomic_read(&dev->dev_access_obj.obj_access_count));
1318                 return NULL;
1319         }
1320
1321         lun_p = core_tpg_pre_addlun(tpg, lun);
1322         if ((IS_ERR(lun_p)) || !lun_p)
1323                 return NULL;
1324
1325         if (dev->dev_flags & DF_READ_ONLY)
1326                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1327         else
1328                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1329
1330         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1331                 return NULL;
1332
1333         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1334                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1335                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1336                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1337         /*
1338          * Update LUN maps for dynamically added initiators when
1339          * generate_node_acl is enabled.
1340          */
1341         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1342                 struct se_node_acl *acl;
1343                 spin_lock_irq(&tpg->acl_node_lock);
1344                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1345                         if (acl->dynamic_node_acl &&
1346                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1347                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1348                                 spin_unlock_irq(&tpg->acl_node_lock);
1349                                 core_tpg_add_node_to_devs(acl, tpg);
1350                                 spin_lock_irq(&tpg->acl_node_lock);
1351                         }
1352                 }
1353                 spin_unlock_irq(&tpg->acl_node_lock);
1354         }
1355
1356         return lun_p;
1357 }
1358
1359 /*      core_dev_del_lun():
1360  *
1361  *
1362  */
1363 int core_dev_del_lun(
1364         struct se_portal_group *tpg,
1365         u32 unpacked_lun)
1366 {
1367         struct se_lun *lun;
1368         int ret = 0;
1369
1370         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1371         if (!lun)
1372                 return ret;
1373
1374         core_tpg_post_dellun(tpg, lun);
1375
1376         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1377                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1378                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1379                 tpg->se_tpg_tfo->get_fabric_name());
1380
1381         return 0;
1382 }
1383
1384 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1385 {
1386         struct se_lun *lun;
1387
1388         spin_lock(&tpg->tpg_lun_lock);
1389         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1390                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1391                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1392                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1393                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1394                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1395                 spin_unlock(&tpg->tpg_lun_lock);
1396                 return NULL;
1397         }
1398         lun = &tpg->tpg_lun_list[unpacked_lun];
1399
1400         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1401                 pr_err("%s Logical Unit Number: %u is not free on"
1402                         " Target Portal Group: %hu, ignoring request.\n",
1403                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1404                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1405                 spin_unlock(&tpg->tpg_lun_lock);
1406                 return NULL;
1407         }
1408         spin_unlock(&tpg->tpg_lun_lock);
1409
1410         return lun;
1411 }
1412
1413 /*      core_dev_get_lun():
1414  *
1415  *
1416  */
1417 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1418 {
1419         struct se_lun *lun;
1420
1421         spin_lock(&tpg->tpg_lun_lock);
1422         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1423                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1424                         "_TPG-1: %u for Target Portal Group: %hu\n",
1425                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1426                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1427                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1428                 spin_unlock(&tpg->tpg_lun_lock);
1429                 return NULL;
1430         }
1431         lun = &tpg->tpg_lun_list[unpacked_lun];
1432
1433         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1434                 pr_err("%s Logical Unit Number: %u is not active on"
1435                         " Target Portal Group: %hu, ignoring request.\n",
1436                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1437                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1438                 spin_unlock(&tpg->tpg_lun_lock);
1439                 return NULL;
1440         }
1441         spin_unlock(&tpg->tpg_lun_lock);
1442
1443         return lun;
1444 }
1445
1446 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1447         struct se_portal_group *tpg,
1448         struct se_node_acl *nacl,
1449         u32 mapped_lun,
1450         int *ret)
1451 {
1452         struct se_lun_acl *lacl;
1453
1454         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1455                 pr_err("%s InitiatorName exceeds maximum size.\n",
1456                         tpg->se_tpg_tfo->get_fabric_name());
1457                 *ret = -EOVERFLOW;
1458                 return NULL;
1459         }
1460         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1461         if (!lacl) {
1462                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1463                 *ret = -ENOMEM;
1464                 return NULL;
1465         }
1466
1467         INIT_LIST_HEAD(&lacl->lacl_list);
1468         lacl->mapped_lun = mapped_lun;
1469         lacl->se_lun_nacl = nacl;
1470         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1471                  nacl->initiatorname);
1472
1473         return lacl;
1474 }
1475
1476 int core_dev_add_initiator_node_lun_acl(
1477         struct se_portal_group *tpg,
1478         struct se_lun_acl *lacl,
1479         u32 unpacked_lun,
1480         u32 lun_access)
1481 {
1482         struct se_lun *lun;
1483         struct se_node_acl *nacl;
1484
1485         lun = core_dev_get_lun(tpg, unpacked_lun);
1486         if (!lun) {
1487                 pr_err("%s Logical Unit Number: %u is not active on"
1488                         " Target Portal Group: %hu, ignoring request.\n",
1489                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1490                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1491                 return -EINVAL;
1492         }
1493
1494         nacl = lacl->se_lun_nacl;
1495         if (!nacl)
1496                 return -EINVAL;
1497
1498         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1499             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1500                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1501
1502         lacl->se_lun = lun;
1503
1504         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1505                         lun_access, nacl, tpg, 1) < 0)
1506                 return -EINVAL;
1507
1508         spin_lock(&lun->lun_acl_lock);
1509         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1510         atomic_inc(&lun->lun_acl_count);
1511         smp_mb__after_atomic_inc();
1512         spin_unlock(&lun->lun_acl_lock);
1513
1514         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1515                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1516                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1517                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1518                 lacl->initiatorname);
1519         /*
1520          * Check to see if there are any existing persistent reservation APTPL
1521          * pre-registrations that need to be enabled for this LUN ACL..
1522          */
1523         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1524         return 0;
1525 }
1526
1527 /*      core_dev_del_initiator_node_lun_acl():
1528  *
1529  *
1530  */
1531 int core_dev_del_initiator_node_lun_acl(
1532         struct se_portal_group *tpg,
1533         struct se_lun *lun,
1534         struct se_lun_acl *lacl)
1535 {
1536         struct se_node_acl *nacl;
1537
1538         nacl = lacl->se_lun_nacl;
1539         if (!nacl)
1540                 return -EINVAL;
1541
1542         spin_lock(&lun->lun_acl_lock);
1543         list_del(&lacl->lacl_list);
1544         atomic_dec(&lun->lun_acl_count);
1545         smp_mb__after_atomic_dec();
1546         spin_unlock(&lun->lun_acl_lock);
1547
1548         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1549                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1550
1551         lacl->se_lun = NULL;
1552
1553         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1554                 " InitiatorNode: %s Mapped LUN: %u\n",
1555                 tpg->se_tpg_tfo->get_fabric_name(),
1556                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1557                 lacl->initiatorname, lacl->mapped_lun);
1558
1559         return 0;
1560 }
1561
1562 void core_dev_free_initiator_node_lun_acl(
1563         struct se_portal_group *tpg,
1564         struct se_lun_acl *lacl)
1565 {
1566         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1567                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1568                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1569                 tpg->se_tpg_tfo->get_fabric_name(),
1570                 lacl->initiatorname, lacl->mapped_lun);
1571
1572         kfree(lacl);
1573 }
1574
1575 int core_dev_setup_virtual_lun0(void)
1576 {
1577         struct se_hba *hba;
1578         struct se_device *dev;
1579         struct se_subsystem_dev *se_dev = NULL;
1580         struct se_subsystem_api *t;
1581         char buf[16];
1582         int ret;
1583
1584         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1585         if (IS_ERR(hba))
1586                 return PTR_ERR(hba);
1587
1588         lun0_hba = hba;
1589         t = hba->transport;
1590
1591         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1592         if (!se_dev) {
1593                 pr_err("Unable to allocate memory for"
1594                                 " struct se_subsystem_dev\n");
1595                 ret = -ENOMEM;
1596                 goto out;
1597         }
1598         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1599         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1600         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1601         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1602         spin_lock_init(&se_dev->t10_pr.registration_lock);
1603         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1604         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1605         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1606         spin_lock_init(&se_dev->se_dev_lock);
1607         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1608         se_dev->t10_wwn.t10_sub_dev = se_dev;
1609         se_dev->t10_alua.t10_sub_dev = se_dev;
1610         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1611         se_dev->se_dev_hba = hba;
1612
1613         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1614         if (!se_dev->se_dev_su_ptr) {
1615                 pr_err("Unable to locate subsystem dependent pointer"
1616                         " from allocate_virtdevice()\n");
1617                 ret = -ENOMEM;
1618                 goto out;
1619         }
1620         lun0_su_dev = se_dev;
1621
1622         memset(buf, 0, 16);
1623         sprintf(buf, "rd_pages=8");
1624         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1625
1626         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1627         if (IS_ERR(dev)) {
1628                 ret = PTR_ERR(dev);
1629                 goto out;
1630         }
1631         se_dev->se_dev_ptr = dev;
1632         g_lun0_dev = dev;
1633
1634         return 0;
1635 out:
1636         lun0_su_dev = NULL;
1637         kfree(se_dev);
1638         if (lun0_hba) {
1639                 core_delete_hba(lun0_hba);
1640                 lun0_hba = NULL;
1641         }
1642         return ret;
1643 }
1644
1645
1646 void core_dev_release_virtual_lun0(void)
1647 {
1648         struct se_hba *hba = lun0_hba;
1649         struct se_subsystem_dev *su_dev = lun0_su_dev;
1650
1651         if (!hba)
1652                 return;
1653
1654         if (g_lun0_dev)
1655                 se_free_virtual_device(g_lun0_dev, hba);
1656
1657         kfree(su_dev);
1658         core_delete_hba(hba);
1659 }