drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/export.h>
  39 #include <net/sock.h>
  40 #include <net/tcp.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_device.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_ua.h"
  52
  53 static void se_dev_start(struct se_device *dev);
  54 static void se_dev_stop(struct se_device *dev);
  55
  56 static struct se_hba *lun0_hba;
  57 static struct se_subsystem_dev *lun0_su_dev;
  58 /* not static, needed by tpg.c */
  59 struct se_device *g_lun0_dev;
  60
  61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  62 {
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = se_cmd->se_sess;
  65         struct se_device *dev;
  66         unsigned long flags;
  67
  68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  71                 return -ENODEV;
  72         }
  73
  74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  75         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                 struct se_dev_entry *deve = se_cmd->se_deve;
  78
  79                 deve->total_cmds++;
  80                 deve->total_bytes += se_cmd->data_length;
  81
  82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  87                                 " Access for 0x%08x\n",
  88                                 se_cmd->se_tfo->get_fabric_name(),
  89                                 unpacked_lun);
  90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  91                         return -EACCES;
  92                 }
  93
  94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  95                         deve->write_bytes += se_cmd->data_length;
  96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  97                         deve->read_bytes += se_cmd->data_length;
  98
  99                 deve->deve_cmds++;
 100
 101                 se_lun = deve->se_lun;
 102                 se_cmd->se_lun = deve->se_lun;
 103                 se_cmd->pr_res_key = deve->pr_res_key;
 104                 se_cmd->orig_fe_lun = unpacked_lun;
 105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 106         }
 107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 108
 109         if (!se_lun) {
 110                 /*
 111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 112                  * REPORT_LUNS, et al to be returned when no active
 113                  * MappedLUN=0 exists for this Initiator Port.
 114                  */
 115                 if (unpacked_lun != 0) {
 116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 119                                 " Access for 0x%08x\n",
 120                                 se_cmd->se_tfo->get_fabric_name(),
 121                                 unpacked_lun);
 122                         return -ENODEV;
 123                 }
 124                 /*
 125                  * Force WRITE PROTECT for virtual LUN 0
 126                  */
 127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                     (se_cmd->data_direction != DMA_NONE)) {
 129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 131                         return -EACCES;
 132                 }
 133
 134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                 se_cmd->orig_fe_lun = 0;
 137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 138         }
 139         /*
 140          * Determine if the struct se_lun is online.
 141          * FIXME: Check for LUN_RESET + UNIT Attention
 142          */
 143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 146                 return -ENODEV;
 147         }
 148
 149         /* Directly associate cmd with se_dev */
 150         se_cmd->se_dev = se_lun->lun_se_dev;
 151
 152         /* TODO: get rid of this and use atomics for stats */
 153         dev = se_lun->lun_se_dev;
 154         spin_lock_irqsave(&dev->stats_lock, flags);
 155         dev->num_cmds++;
 156         if (se_cmd->data_direction == DMA_TO_DEVICE)
 157                 dev->write_bytes += se_cmd->data_length;
 158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 159                 dev->read_bytes += se_cmd->data_length;
 160         spin_unlock_irqrestore(&dev->stats_lock, flags);
 161
 162         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 163         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 164         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 169
 170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 171 {
 172         struct se_dev_entry *deve;
 173         struct se_lun *se_lun = NULL;
 174         struct se_session *se_sess = se_cmd->se_sess;
 175         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 176         unsigned long flags;
 177
 178         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 179                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 180                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 181                 return -ENODEV;
 182         }
 183
 184         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 185         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 186         deve = se_cmd->se_deve;
 187
 188         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 189                 se_tmr->tmr_lun = deve->se_lun;
 190                 se_cmd->se_lun = deve->se_lun;
 191                 se_lun = deve->se_lun;
 192                 se_cmd->pr_res_key = deve->pr_res_key;
 193                 se_cmd->orig_fe_lun = unpacked_lun;
 194         }
 195         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 196
 197         if (!se_lun) {
 198                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 199                         " Access for 0x%08x\n",
 200                         se_cmd->se_tfo->get_fabric_name(),
 201                         unpacked_lun);
 202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 203                 return -ENODEV;
 204         }
 205         /*
 206          * Determine if the struct se_lun is online.
 207          * FIXME: Check for LUN_RESET + UNIT Attention
 208          */
 209         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 210                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 211                 return -ENODEV;
 212         }
 213
 214         /* Directly associate cmd with se_dev */
 215         se_cmd->se_dev = se_lun->lun_se_dev;
 216         se_tmr->tmr_dev = se_lun->lun_se_dev;
 217
 218         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 219         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 220         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 221
 222         return 0;
 223 }
 224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 225
 226 /*
 227  * This function is called from core_scsi3_emulate_pro_register_and_move()
 228  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 229  * when a matching rtpi is found.
 230  */
 231 struct se_dev_entry *core_get_se_deve_from_rtpi(
 232         struct se_node_acl *nacl,
 233         u16 rtpi)
 234 {
 235         struct se_dev_entry *deve;
 236         struct se_lun *lun;
 237         struct se_port *port;
 238         struct se_portal_group *tpg = nacl->se_tpg;
 239         u32 i;
 240
 241         spin_lock_irq(&nacl->device_list_lock);
 242         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 243                 deve = nacl->device_list[i];
 244
 245                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 246                         continue;
 247
 248                 lun = deve->se_lun;
 249                 if (!lun) {
 250                         pr_err("%s device entries device pointer is"
 251                                 " NULL, but Initiator has access.\n",
 252                                 tpg->se_tpg_tfo->get_fabric_name());
 253                         continue;
 254                 }
 255                 port = lun->lun_sep;
 256                 if (!port) {
 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                 if (port->sep_rtpi != rtpi)
 263                         continue;
 264
 265                 atomic_inc(&deve->pr_ref_count);
 266                 smp_mb__after_atomic_inc();
 267                 spin_unlock_irq(&nacl->device_list_lock);
 268
 269                 return deve;
 270         }
 271         spin_unlock_irq(&nacl->device_list_lock);
 272
 273         return NULL;
 274 }
 275
 276 int core_free_device_list_for_node(
 277         struct se_node_acl *nacl,
 278         struct se_portal_group *tpg)
 279 {
 280         struct se_dev_entry *deve;
 281         struct se_lun *lun;
 282         u32 i;
 283
 284         if (!nacl->device_list)
 285                 return 0;
 286
 287         spin_lock_irq(&nacl->device_list_lock);
 288         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 289                 deve = nacl->device_list[i];
 290
 291                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 292                         continue;
 293
 294                 if (!deve->se_lun) {
 295                         pr_err("%s device entries device pointer is"
 296                                 " NULL, but Initiator has access.\n",
 297                                 tpg->se_tpg_tfo->get_fabric_name());
 298                         continue;
 299                 }
 300                 lun = deve->se_lun;
 301
 302                 spin_unlock_irq(&nacl->device_list_lock);
 303                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 304                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 305                 spin_lock_irq(&nacl->device_list_lock);
 306         }
 307         spin_unlock_irq(&nacl->device_list_lock);
 308
 309         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 310         nacl->device_list = NULL;
 311
 312         return 0;
 313 }
 314
 315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 316 {
 317         struct se_dev_entry *deve;
 318         unsigned long flags;
 319
 320         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 321         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 322         deve->deve_cmds--;
 323         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 324 }
 325
 326 void core_update_device_list_access(
 327         u32 mapped_lun,
 328         u32 lun_access,
 329         struct se_node_acl *nacl)
 330 {
 331         struct se_dev_entry *deve;
 332
 333         spin_lock_irq(&nacl->device_list_lock);
 334         deve = nacl->device_list[mapped_lun];
 335         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 336                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 337                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 338         } else {
 339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341         }
 342         spin_unlock_irq(&nacl->device_list_lock);
 343 }
 344
 345 /*      core_enable_device_list_for_node():
 346  *
 347  *
 348  */
 349 int core_enable_device_list_for_node(
 350         struct se_lun *lun,
 351         struct se_lun_acl *lun_acl,
 352         u32 mapped_lun,
 353         u32 lun_access,
 354         struct se_node_acl *nacl,
 355         struct se_portal_group *tpg)
 356 {
 357         struct se_port *port = lun->lun_sep;
 358         struct se_dev_entry *deve;
 359
 360         spin_lock_irq(&nacl->device_list_lock);
 361
 362         deve = nacl->device_list[mapped_lun];
 363
 364         /*
 365          * Check if the call is handling demo mode -> explict LUN ACL
 366          * transition.  This transition must be for the same struct se_lun
 367          * + mapped_lun that was setup in demo mode..
 368          */
 369         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 370                 if (deve->se_lun_acl != NULL) {
 371                         pr_err("struct se_dev_entry->se_lun_acl"
 372                                " already set for demo mode -> explict"
 373                                " LUN ACL transition\n");
 374                         spin_unlock_irq(&nacl->device_list_lock);
 375                         return -EINVAL;
 376                 }
 377                 if (deve->se_lun != lun) {
 378                         pr_err("struct se_dev_entry->se_lun does"
 379                                " match passed struct se_lun for demo mode"
 380                                " -> explict LUN ACL transition\n");
 381                         spin_unlock_irq(&nacl->device_list_lock);
 382                         return -EINVAL;
 383                 }
 384                 deve->se_lun_acl = lun_acl;
 385
 386                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 387                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 388                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 389                 } else {
 390                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 391                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 392                 }
 393
 394                 spin_unlock_irq(&nacl->device_list_lock);
 395                 return 0;
 396         }
 397
 398         deve->se_lun = lun;
 399         deve->se_lun_acl = lun_acl;
 400         deve->mapped_lun = mapped_lun;
 401         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 402
 403         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 404                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 405                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 406         } else {
 407                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 408                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 409         }
 410
 411         deve->creation_time = get_jiffies_64();
 412         deve->attach_count++;
 413         spin_unlock_irq(&nacl->device_list_lock);
 414
 415         spin_lock_bh(&port->sep_alua_lock);
 416         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 417         spin_unlock_bh(&port->sep_alua_lock);
 418
 419         return 0;
 420 }
 421
 422 /*      core_disable_device_list_for_node():
 423  *
 424  *
 425  */
 426 int core_disable_device_list_for_node(
 427         struct se_lun *lun,
 428         struct se_lun_acl *lun_acl,
 429         u32 mapped_lun,
 430         u32 lun_access,
 431         struct se_node_acl *nacl,
 432         struct se_portal_group *tpg)
 433 {
 434         struct se_port *port = lun->lun_sep;
 435         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 436
 437         /*
 438          * If the MappedLUN entry is being disabled, the entry in
 439          * port->sep_alua_list must be removed now before clearing the
 440          * struct se_dev_entry pointers below as logic in
 441          * core_alua_do_transition_tg_pt() depends on these being present.
 442          *
 443          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 444          * that have not been explicitly converted to MappedLUNs ->
 445          * struct se_lun_acl, but we remove deve->alua_port_list from
 446          * port->sep_alua_list. This also means that active UAs and
 447          * NodeACL context specific PR metadata for demo-mode
 448          * MappedLUN *deve will be released below..
 449          */
 450         spin_lock_bh(&port->sep_alua_lock);
 451         list_del(&deve->alua_port_list);
 452         spin_unlock_bh(&port->sep_alua_lock);
 453         /*
 454          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 455          * PR operation to complete.
 456          */
 457         while (atomic_read(&deve->pr_ref_count) != 0)
 458                 cpu_relax();
 459
 460         spin_lock_irq(&nacl->device_list_lock);
 461         /*
 462          * Disable struct se_dev_entry LUN ACL mapping
 463          */
 464         core_scsi3_ua_release_all(deve);
 465         deve->se_lun = NULL;
 466         deve->se_lun_acl = NULL;
 467         deve->lun_flags = 0;
 468         deve->creation_time = 0;
 469         deve->attach_count--;
 470         spin_unlock_irq(&nacl->device_list_lock);
 471
 472         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 473         return 0;
 474 }
 475
 476 /*      core_clear_lun_from_tpg():
 477  *
 478  *
 479  */
 480 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 481 {
 482         struct se_node_acl *nacl;
 483         struct se_dev_entry *deve;
 484         u32 i;
 485
 486         spin_lock_irq(&tpg->acl_node_lock);
 487         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 488                 spin_unlock_irq(&tpg->acl_node_lock);
 489
 490                 spin_lock_irq(&nacl->device_list_lock);
 491                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 492                         deve = nacl->device_list[i];
 493                         if (lun != deve->se_lun)
 494                                 continue;
 495                         spin_unlock_irq(&nacl->device_list_lock);
 496
 497                         core_disable_device_list_for_node(lun, NULL,
 498                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 499                                 nacl, tpg);
 500
 501                         spin_lock_irq(&nacl->device_list_lock);
 502                 }
 503                 spin_unlock_irq(&nacl->device_list_lock);
 504
 505                 spin_lock_irq(&tpg->acl_node_lock);
 506         }
 507         spin_unlock_irq(&tpg->acl_node_lock);
 508 }
 509
 510 static struct se_port *core_alloc_port(struct se_device *dev)
 511 {
 512         struct se_port *port, *port_tmp;
 513
 514         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 515         if (!port) {
 516                 pr_err("Unable to allocate struct se_port\n");
 517                 return ERR_PTR(-ENOMEM);
 518         }
 519         INIT_LIST_HEAD(&port->sep_alua_list);
 520         INIT_LIST_HEAD(&port->sep_list);
 521         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 522         spin_lock_init(&port->sep_alua_lock);
 523         mutex_init(&port->sep_tg_pt_md_mutex);
 524
 525         spin_lock(&dev->se_port_lock);
 526         if (dev->dev_port_count == 0x0000ffff) {
 527                 pr_warn("Reached dev->dev_port_count =="
 528                                 " 0x0000ffff\n");
 529                 spin_unlock(&dev->se_port_lock);
 530                 return ERR_PTR(-ENOSPC);
 531         }
 532 again:
 533         /*
 534          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 535          * Here is the table from spc4r17 section 7.7.3.8.
 536          *
 537          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 538          *
 539          * Code      Description
 540          * 0h        Reserved
 541          * 1h        Relative port 1, historically known as port A
 542          * 2h        Relative port 2, historically known as port B
 543          * 3h to FFFFh    Relative port 3 through 65 535
 544          */
 545         port->sep_rtpi = dev->dev_rpti_counter++;
 546         if (!port->sep_rtpi)
 547                 goto again;
 548
 549         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 550                 /*
 551                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 552                  * for 16-bit wrap..
 553                  */
 554                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 555                         goto again;
 556         }
 557         spin_unlock(&dev->se_port_lock);
 558
 559         return port;
 560 }
 561
 562 static void core_export_port(
 563         struct se_device *dev,
 564         struct se_portal_group *tpg,
 565         struct se_port *port,
 566         struct se_lun *lun)
 567 {
 568         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 569         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 570
 571         spin_lock(&dev->se_port_lock);
 572         spin_lock(&lun->lun_sep_lock);
 573         port->sep_tpg = tpg;
 574         port->sep_lun = lun;
 575         lun->lun_sep = port;
 576         spin_unlock(&lun->lun_sep_lock);
 577
 578         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 579         spin_unlock(&dev->se_port_lock);
 580
 581         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 582                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 583                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 584                         pr_err("Unable to allocate t10_alua_tg_pt"
 585                                         "_gp_member_t\n");
 586                         return;
 587                 }
 588                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 589                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 590                         su_dev->t10_alua.default_tg_pt_gp);
 591                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 592                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 593                         " Group: alua/default_tg_pt_gp\n",
 594                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 595         }
 596
 597         dev->dev_port_count++;
 598         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 599 }
 600
 601 /*
 602  *      Called with struct se_device->se_port_lock spinlock held.
 603  */
 604 static void core_release_port(struct se_device *dev, struct se_port *port)
 605         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 606 {
 607         /*
 608          * Wait for any port reference for PR ALL_TG_PT=1 operation
 609          * to complete in __core_scsi3_alloc_registration()
 610          */
 611         spin_unlock(&dev->se_port_lock);
 612         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 613                 cpu_relax();
 614         spin_lock(&dev->se_port_lock);
 615
 616         core_alua_free_tg_pt_gp_mem(port);
 617
 618         list_del(&port->sep_list);
 619         dev->dev_port_count--;
 620         kfree(port);
 621 }
 622
 623 int core_dev_export(
 624         struct se_device *dev,
 625         struct se_portal_group *tpg,
 626         struct se_lun *lun)
 627 {
 628         struct se_port *port;
 629
 630         port = core_alloc_port(dev);
 631         if (IS_ERR(port))
 632                 return PTR_ERR(port);
 633
 634         lun->lun_se_dev = dev;
 635         se_dev_start(dev);
 636
 637         atomic_inc(&dev->dev_export_obj.obj_access_count);
 638         core_export_port(dev, tpg, port, lun);
 639         return 0;
 640 }
 641
 642 void core_dev_unexport(
 643         struct se_device *dev,
 644         struct se_portal_group *tpg,
 645         struct se_lun *lun)
 646 {
 647         struct se_port *port = lun->lun_sep;
 648
 649         spin_lock(&lun->lun_sep_lock);
 650         if (lun->lun_se_dev == NULL) {
 651                 spin_unlock(&lun->lun_sep_lock);
 652                 return;
 653         }
 654         spin_unlock(&lun->lun_sep_lock);
 655
 656         spin_lock(&dev->se_port_lock);
 657         atomic_dec(&dev->dev_export_obj.obj_access_count);
 658         core_release_port(dev, port);
 659         spin_unlock(&dev->se_port_lock);
 660
 661         se_dev_stop(dev);
 662         lun->lun_se_dev = NULL;
 663 }
 664
 665 int target_report_luns(struct se_cmd *se_cmd)
 666 {
 667         struct se_dev_entry *deve;
 668         struct se_session *se_sess = se_cmd->se_sess;
 669         unsigned char *buf;
 670         u32 lun_count = 0, offset = 8, i;
 671
 672         if (se_cmd->data_length < 16) {
 673                 pr_warn("REPORT LUNS allocation length %u too small\n",
 674                         se_cmd->data_length);
 675                 se_cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 676                 return -EINVAL;
 677         }
 678
 679         buf = transport_kmap_data_sg(se_cmd);
 680         if (!buf)
 681                 return -ENOMEM;
 682
 683         /*
 684          * If no struct se_session pointer is present, this struct se_cmd is
 685          * coming via a target_core_mod PASSTHROUGH op, and not through
 686          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 687          */
 688         if (!se_sess) {
 689                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 690                 lun_count = 1;
 691                 goto done;
 692         }
 693
 694         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 695         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 696                 deve = se_sess->se_node_acl->device_list[i];
 697                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 698                         continue;
 699                 /*
 700                  * We determine the correct LUN LIST LENGTH even once we
 701                  * have reached the initial allocation length.
 702                  * See SPC2-R20 7.19.
 703                  */
 704                 lun_count++;
 705                 if ((offset + 8) > se_cmd->data_length)
 706                         continue;
 707
 708                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 709                 offset += 8;
 710         }
 711         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 712
 713         /*
 714          * See SPC3 r07, page 159.
 715          */
 716 done:
 717         lun_count *= 8;
 718         buf[0] = ((lun_count >> 24) & 0xff);
 719         buf[1] = ((lun_count >> 16) & 0xff);
 720         buf[2] = ((lun_count >> 8) & 0xff);
 721         buf[3] = (lun_count & 0xff);
 722         transport_kunmap_data_sg(se_cmd);
 723
 724         target_complete_cmd(se_cmd, GOOD);
 725         return 0;
 726 }
 727
 728 /*      se_release_device_for_hba():
 729  *
 730  *
 731  */
 732 void se_release_device_for_hba(struct se_device *dev)
 733 {
 734         struct se_hba *hba = dev->se_hba;
 735
 736         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 737             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 738             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 739             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 740             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 741                 se_dev_stop(dev);
 742
 743         if (dev->dev_ptr) {
 744                 destroy_workqueue(dev->tmr_wq);
 745                 if (dev->transport->free_device)
 746                         dev->transport->free_device(dev->dev_ptr);
 747         }
 748
 749         spin_lock(&hba->device_lock);
 750         list_del(&dev->dev_list);
 751         hba->dev_count--;
 752         spin_unlock(&hba->device_lock);
 753
 754         core_scsi3_free_all_registrations(dev);
 755         se_release_vpd_for_dev(dev);
 756
 757         kfree(dev);
 758 }
 759
 760 void se_release_vpd_for_dev(struct se_device *dev)
 761 {
 762         struct t10_vpd *vpd, *vpd_tmp;
 763
 764         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 765         list_for_each_entry_safe(vpd, vpd_tmp,
 766                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 767                 list_del(&vpd->vpd_list);
 768                 kfree(vpd);
 769         }
 770         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 771 }
 772
 773 /*      se_free_virtual_device():
 774  *
 775  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 776  */
 777 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 778 {
 779         if (!list_empty(&dev->dev_sep_list))
 780                 dump_stack();
 781
 782         core_alua_free_lu_gp_mem(dev);
 783         se_release_device_for_hba(dev);
 784
 785         return 0;
 786 }
 787
 788 static void se_dev_start(struct se_device *dev)
 789 {
 790         struct se_hba *hba = dev->se_hba;
 791
 792         spin_lock(&hba->device_lock);
 793         atomic_inc(&dev->dev_obj.obj_access_count);
 794         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 795                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 796                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 797                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 798                 } else if (dev->dev_status &
 799                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 800                         dev->dev_status &=
 801                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 802                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 803                 }
 804         }
 805         spin_unlock(&hba->device_lock);
 806 }
 807
 808 static void se_dev_stop(struct se_device *dev)
 809 {
 810         struct se_hba *hba = dev->se_hba;
 811
 812         spin_lock(&hba->device_lock);
 813         atomic_dec(&dev->dev_obj.obj_access_count);
 814         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 815                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 816                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 817                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 818                 } else if (dev->dev_status &
 819                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 820                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 821                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 822                 }
 823         }
 824         spin_unlock(&hba->device_lock);
 825 }
 826
 827 int se_dev_check_online(struct se_device *dev)
 828 {
 829         unsigned long flags;
 830         int ret;
 831
 832         spin_lock_irqsave(&dev->dev_status_lock, flags);
 833         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 834                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 835         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 836
 837         return ret;
 838 }
 839
 840 int se_dev_check_shutdown(struct se_device *dev)
 841 {
 842         int ret;
 843
 844         spin_lock_irq(&dev->dev_status_lock);
 845         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 846         spin_unlock_irq(&dev->dev_status_lock);
 847
 848         return ret;
 849 }
 850
 851 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 852 {
 853         u32 tmp, aligned_max_sectors;
 854         /*
 855          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 856          * transport_allocate_data_tasks() operation.
 857          */
 858         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 859         aligned_max_sectors = (tmp / block_size);
 860         if (max_sectors != aligned_max_sectors) {
 861                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 862                                 " to %u\n", max_sectors, aligned_max_sectors);
 863                 return aligned_max_sectors;
 864         }
 865
 866         return max_sectors;
 867 }
 868
 869 void se_dev_set_default_attribs(
 870         struct se_device *dev,
 871         struct se_dev_limits *dev_limits)
 872 {
 873         struct queue_limits *limits = &dev_limits->limits;
 874
 875         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 876         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 877         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 878         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 879         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 880         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 881         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 882         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 883         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 884         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 885         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 886         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 887         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 888         /*
 889          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 890          * iblock_create_virtdevice() from struct queue_limits values
 891          * if blk_queue_discard()==1
 892          */
 893         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 894         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 895                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 896         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 897         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 898                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 899         /*
 900          * block_size is based on subsystem plugin dependent requirements.
 901          */
 902         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 903         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 904         /*
 905          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 906          */
 907         limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
 908                                                 limits->logical_block_size);
 909         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 910
 911         /*
 912          * Set fabric_max_sectors, which is reported in block limits
 913          * VPD page (B0h).
 914          */
 915         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
 916         /*
 917          * Set optimal_sectors from fabric_max_sectors, which can be
 918          * lowered via configfs.
 919          */
 920         dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
 921         /*
 922          * queue_depth is based on subsystem plugin dependent requirements.
 923          */
 924         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 925         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 926 }
 927
 928 int se_dev_set_max_unmap_lba_count(
 929         struct se_device *dev,
 930         u32 max_unmap_lba_count)
 931 {
 932         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 933         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 934                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 935         return 0;
 936 }
 937
 938 int se_dev_set_max_unmap_block_desc_count(
 939         struct se_device *dev,
 940         u32 max_unmap_block_desc_count)
 941 {
 942         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 943                 max_unmap_block_desc_count;
 944         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 945                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 946         return 0;
 947 }
 948
 949 int se_dev_set_unmap_granularity(
 950         struct se_device *dev,
 951         u32 unmap_granularity)
 952 {
 953         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 954         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 955                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 956         return 0;
 957 }
 958
 959 int se_dev_set_unmap_granularity_alignment(
 960         struct se_device *dev,
 961         u32 unmap_granularity_alignment)
 962 {
 963         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 964         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 965                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 966         return 0;
 967 }
 968
 969 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 970 {
 971         if (flag != 0 && flag != 1) {
 972                 pr_err("Illegal value %d\n", flag);
 973                 return -EINVAL;
 974         }
 975
 976         if (flag) {
 977                 pr_err("dpo_emulated not supported\n");
 978                 return -EINVAL;
 979         }
 980
 981         return 0;
 982 }
 983
 984 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 985 {
 986         if (flag != 0 && flag != 1) {
 987                 pr_err("Illegal value %d\n", flag);
 988                 return -EINVAL;
 989         }
 990
 991         if (flag &&
 992             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 993                 pr_err("emulate_fua_write not supported for pSCSI\n");
 994                 return -EINVAL;
 995         }
 996         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 997         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 998                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 999         return 0;
1000 }
1001
1002 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1003 {
1004         if (flag != 0 && flag != 1) {
1005                 pr_err("Illegal value %d\n", flag);
1006                 return -EINVAL;
1007         }
1008
1009         if (flag) {
1010                 pr_err("ua read emulated not supported\n");
1011                 return -EINVAL;
1012         }
1013
1014         return 0;
1015 }
1016
1017 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1018 {
1019         if (flag != 0 && flag != 1) {
1020                 pr_err("Illegal value %d\n", flag);
1021                 return -EINVAL;
1022         }
1023         if (flag &&
1024             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1025                 pr_err("emulate_write_cache not supported for pSCSI\n");
1026                 return -EINVAL;
1027         }
1028         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1029         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1030                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1031         return 0;
1032 }
1033
1034 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1035 {
1036         if ((flag != 0) && (flag != 1) && (flag != 2)) {
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"
1043                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1044                         " exists\n", dev,
1045                         atomic_read(&dev->dev_export_obj.obj_access_count));
1046                 return -EINVAL;
1047         }
1048         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1049         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1050                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1051
1052         return 0;
1053 }
1054
1055 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1056 {
1057         if ((flag != 0) && (flag != 1)) {
1058                 pr_err("Illegal value %d\n", flag);
1059                 return -EINVAL;
1060         }
1061
1062         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1063                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1064                         " dev_export_obj: %d count exists\n", dev,
1065                         atomic_read(&dev->dev_export_obj.obj_access_count));
1066                 return -EINVAL;
1067         }
1068         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1069         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1070                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1071
1072         return 0;
1073 }
1074
1075 int se_dev_set_emulate_tpu(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_tpu = flag;
1091         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1092                                 dev, flag);
1093         return 0;
1094 }
1095
1096 int se_dev_set_emulate_tpws(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         /*
1103          * We expect this value to be non-zero when generic Block Layer
1104          * Discard supported is detected iblock_create_virtdevice().
1105          */
1106         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1107                 pr_err("Generic Block Discard not supported\n");
1108                 return -ENOSYS;
1109         }
1110
1111         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1112         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1113                                 dev, flag);
1114         return 0;
1115 }
1116
1117 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1118 {
1119         if ((flag != 0) && (flag != 1)) {
1120                 pr_err("Illegal value %d\n", flag);
1121                 return -EINVAL;
1122         }
1123         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1124         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1125                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1126         return 0;
1127 }
1128
1129 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1130 {
1131         if ((flag != 0) && (flag != 1)) {
1132                 printk(KERN_ERR "Illegal value %d\n", flag);
1133                 return -EINVAL;
1134         }
1135         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1136         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1137                dev, flag);
1138         return 0;
1139 }
1140
1141 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1142 {
1143         if (flag != 0) {
1144                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1145                         " reordering not implemented\n", dev);
1146                 return -ENOSYS;
1147         }
1148         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1149         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1150         return 0;
1151 }
1152
1153 /*
1154  * Note, this can only be called on unexported SE Device Object.
1155  */
1156 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1157 {
1158         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1159                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1160                         " dev_export_obj: %d count exists\n", dev,
1161                         atomic_read(&dev->dev_export_obj.obj_access_count));
1162                 return -EINVAL;
1163         }
1164         if (!queue_depth) {
1165                 pr_err("dev[%p]: Illegal ZERO value for queue"
1166                         "_depth\n", dev);
1167                 return -EINVAL;
1168         }
1169
1170         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1171                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1172                         pr_err("dev[%p]: Passed queue_depth: %u"
1173                                 " exceeds TCM/SE_Device TCQ: %u\n",
1174                                 dev, queue_depth,
1175                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1176                         return -EINVAL;
1177                 }
1178         } else {
1179                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1180                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1181                                 pr_err("dev[%p]: Passed queue_depth:"
1182                                         " %u exceeds TCM/SE_Device MAX"
1183                                         " TCQ: %u\n", dev, queue_depth,
1184                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1185                                 return -EINVAL;
1186                         }
1187                 }
1188         }
1189
1190         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1191         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1192                         dev, queue_depth);
1193         return 0;
1194 }
1195
1196 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1197 {
1198         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1199                 pr_err("dev[%p]: Unable to change SE Device"
1200                         " fabric_max_sectors while dev_export_obj: %d count exists\n",
1201                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1202                 return -EINVAL;
1203         }
1204         if (!fabric_max_sectors) {
1205                 pr_err("dev[%p]: Illegal ZERO value for"
1206                         " fabric_max_sectors\n", dev);
1207                 return -EINVAL;
1208         }
1209         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1210                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1211                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1212                                 DA_STATUS_MAX_SECTORS_MIN);
1213                 return -EINVAL;
1214         }
1215         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1216                 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1217                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1218                                 " greater than TCM/SE_Device max_sectors:"
1219                                 " %u\n", dev, fabric_max_sectors,
1220                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1221                          return -EINVAL;
1222                 }
1223         } else {
1224                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1225                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1226                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1227                                 " %u\n", dev, fabric_max_sectors,
1228                                 DA_STATUS_MAX_SECTORS_MAX);
1229                         return -EINVAL;
1230                 }
1231         }
1232         /*
1233          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1234          */
1235         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1236                                                       dev->se_sub_dev->se_dev_attrib.block_size);
1237
1238         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1239         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1240                         dev, fabric_max_sectors);
1241         return 0;
1242 }
1243
1244 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1245 {
1246         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1247                 pr_err("dev[%p]: Unable to change SE Device"
1248                         " optimal_sectors while dev_export_obj: %d count exists\n",
1249                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1250                 return -EINVAL;
1251         }
1252         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1253                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1254                                 " changed for TCM/pSCSI\n", dev);
1255                 return -EINVAL;
1256         }
1257         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1258                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1259                         " greater than fabric_max_sectors: %u\n", dev,
1260                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1261                 return -EINVAL;
1262         }
1263
1264         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1265         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1266                         dev, optimal_sectors);
1267         return 0;
1268 }
1269
1270 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1271 {
1272         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1273                 pr_err("dev[%p]: Unable to change SE Device block_size"
1274                         " while dev_export_obj: %d count exists\n", dev,
1275                         atomic_read(&dev->dev_export_obj.obj_access_count));
1276                 return -EINVAL;
1277         }
1278
1279         if ((block_size != 512) &&
1280             (block_size != 1024) &&
1281             (block_size != 2048) &&
1282             (block_size != 4096)) {
1283                 pr_err("dev[%p]: Illegal value for block_device: %u"
1284                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1285                         dev, block_size);
1286                 return -EINVAL;
1287         }
1288
1289         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1290                 pr_err("dev[%p]: Not allowed to change block_size for"
1291                         " Physical Device, use for Linux/SCSI to change"
1292                         " block_size for underlying hardware\n", dev);
1293                 return -EINVAL;
1294         }
1295
1296         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1297         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1298                         dev, block_size);
1299         return 0;
1300 }
1301
1302 struct se_lun *core_dev_add_lun(
1303         struct se_portal_group *tpg,
1304         struct se_device *dev,
1305         u32 lun)
1306 {
1307         struct se_lun *lun_p;
1308         int rc;
1309
1310         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1311                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1312                         atomic_read(&dev->dev_access_obj.obj_access_count));
1313                 return ERR_PTR(-EACCES);
1314         }
1315
1316         lun_p = core_tpg_pre_addlun(tpg, lun);
1317         if (IS_ERR(lun_p))
1318                 return lun_p;
1319
1320         rc = core_tpg_post_addlun(tpg, lun_p,
1321                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1322         if (rc < 0)
1323                 return ERR_PTR(rc);
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(), dev->se_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
1361         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1362         if (IS_ERR(lun))
1363                 return PTR_ERR(lun);
1364
1365         core_tpg_post_dellun(tpg, lun);
1366
1367         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1368                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1369                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1370                 tpg->se_tpg_tfo->get_fabric_name());
1371
1372         return 0;
1373 }
1374
1375 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1376 {
1377         struct se_lun *lun;
1378
1379         spin_lock(&tpg->tpg_lun_lock);
1380         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1381                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1382                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1383                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1384                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1385                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1386                 spin_unlock(&tpg->tpg_lun_lock);
1387                 return NULL;
1388         }
1389         lun = tpg->tpg_lun_list[unpacked_lun];
1390
1391         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1392                 pr_err("%s Logical Unit Number: %u is not free on"
1393                         " Target Portal Group: %hu, ignoring request.\n",
1394                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1395                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1396                 spin_unlock(&tpg->tpg_lun_lock);
1397                 return NULL;
1398         }
1399         spin_unlock(&tpg->tpg_lun_lock);
1400
1401         return lun;
1402 }
1403
1404 /*      core_dev_get_lun():
1405  *
1406  *
1407  */
1408 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1409 {
1410         struct se_lun *lun;
1411
1412         spin_lock(&tpg->tpg_lun_lock);
1413         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1414                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1415                         "_TPG-1: %u for Target Portal Group: %hu\n",
1416                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1417                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1418                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1419                 spin_unlock(&tpg->tpg_lun_lock);
1420                 return NULL;
1421         }
1422         lun = tpg->tpg_lun_list[unpacked_lun];
1423
1424         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1425                 pr_err("%s Logical Unit Number: %u is not active on"
1426                         " Target Portal Group: %hu, ignoring request.\n",
1427                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1428                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1429                 spin_unlock(&tpg->tpg_lun_lock);
1430                 return NULL;
1431         }
1432         spin_unlock(&tpg->tpg_lun_lock);
1433
1434         return lun;
1435 }
1436
1437 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1438         struct se_portal_group *tpg,
1439         u32 mapped_lun,
1440         char *initiatorname,
1441         int *ret)
1442 {
1443         struct se_lun_acl *lacl;
1444         struct se_node_acl *nacl;
1445
1446         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1447                 pr_err("%s InitiatorName exceeds maximum size.\n",
1448                         tpg->se_tpg_tfo->get_fabric_name());
1449                 *ret = -EOVERFLOW;
1450                 return NULL;
1451         }
1452         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1453         if (!nacl) {
1454                 *ret = -EINVAL;
1455                 return NULL;
1456         }
1457         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1458         if (!lacl) {
1459                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1460                 *ret = -ENOMEM;
1461                 return NULL;
1462         }
1463
1464         INIT_LIST_HEAD(&lacl->lacl_list);
1465         lacl->mapped_lun = mapped_lun;
1466         lacl->se_lun_nacl = nacl;
1467         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1468
1469         return lacl;
1470 }
1471
1472 int core_dev_add_initiator_node_lun_acl(
1473         struct se_portal_group *tpg,
1474         struct se_lun_acl *lacl,
1475         u32 unpacked_lun,
1476         u32 lun_access)
1477 {
1478         struct se_lun *lun;
1479         struct se_node_acl *nacl;
1480
1481         lun = core_dev_get_lun(tpg, unpacked_lun);
1482         if (!lun) {
1483                 pr_err("%s Logical Unit Number: %u is not active on"
1484                         " Target Portal Group: %hu, ignoring request.\n",
1485                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1486                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1487                 return -EINVAL;
1488         }
1489
1490         nacl = lacl->se_lun_nacl;
1491         if (!nacl)
1492                 return -EINVAL;
1493
1494         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1495             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1496                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1497
1498         lacl->se_lun = lun;
1499
1500         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1501                         lun_access, nacl, tpg) < 0)
1502                 return -EINVAL;
1503
1504         spin_lock(&lun->lun_acl_lock);
1505         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1506         atomic_inc(&lun->lun_acl_count);
1507         smp_mb__after_atomic_inc();
1508         spin_unlock(&lun->lun_acl_lock);
1509
1510         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1511                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1512                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1513                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1514                 lacl->initiatorname);
1515         /*
1516          * Check to see if there are any existing persistent reservation APTPL
1517          * pre-registrations that need to be enabled for this LUN ACL..
1518          */
1519         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1520         return 0;
1521 }
1522
1523 /*      core_dev_del_initiator_node_lun_acl():
1524  *
1525  *
1526  */
1527 int core_dev_del_initiator_node_lun_acl(
1528         struct se_portal_group *tpg,
1529         struct se_lun *lun,
1530         struct se_lun_acl *lacl)
1531 {
1532         struct se_node_acl *nacl;
1533
1534         nacl = lacl->se_lun_nacl;
1535         if (!nacl)
1536                 return -EINVAL;
1537
1538         spin_lock(&lun->lun_acl_lock);
1539         list_del(&lacl->lacl_list);
1540         atomic_dec(&lun->lun_acl_count);
1541         smp_mb__after_atomic_dec();
1542         spin_unlock(&lun->lun_acl_lock);
1543
1544         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1545                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1546
1547         lacl->se_lun = NULL;
1548
1549         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1550                 " InitiatorNode: %s Mapped LUN: %u\n",
1551                 tpg->se_tpg_tfo->get_fabric_name(),
1552                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1553                 lacl->initiatorname, lacl->mapped_lun);
1554
1555         return 0;
1556 }
1557
1558 void core_dev_free_initiator_node_lun_acl(
1559         struct se_portal_group *tpg,
1560         struct se_lun_acl *lacl)
1561 {
1562         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1563                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1564                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1565                 tpg->se_tpg_tfo->get_fabric_name(),
1566                 lacl->initiatorname, lacl->mapped_lun);
1567
1568         kfree(lacl);
1569 }
1570
1571 int core_dev_setup_virtual_lun0(void)
1572 {
1573         struct se_hba *hba;
1574         struct se_device *dev;
1575         struct se_subsystem_dev *se_dev = NULL;
1576         struct se_subsystem_api *t;
1577         char buf[16];
1578         int ret;
1579
1580         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1581         if (IS_ERR(hba))
1582                 return PTR_ERR(hba);
1583
1584         lun0_hba = hba;
1585         t = hba->transport;
1586
1587         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1588         if (!se_dev) {
1589                 pr_err("Unable to allocate memory for"
1590                                 " struct se_subsystem_dev\n");
1591                 ret = -ENOMEM;
1592                 goto out;
1593         }
1594         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1595         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1596         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1597         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1598         spin_lock_init(&se_dev->t10_pr.registration_lock);
1599         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1600         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1601         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1602         spin_lock_init(&se_dev->se_dev_lock);
1603         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1604         se_dev->t10_wwn.t10_sub_dev = se_dev;
1605         se_dev->t10_alua.t10_sub_dev = se_dev;
1606         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1607         se_dev->se_dev_hba = hba;
1608
1609         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1610         if (!se_dev->se_dev_su_ptr) {
1611                 pr_err("Unable to locate subsystem dependent pointer"
1612                         " from allocate_virtdevice()\n");
1613                 ret = -ENOMEM;
1614                 goto out;
1615         }
1616         lun0_su_dev = se_dev;
1617
1618         memset(buf, 0, 16);
1619         sprintf(buf, "rd_pages=8");
1620         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1621
1622         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1623         if (IS_ERR(dev)) {
1624                 ret = PTR_ERR(dev);
1625                 goto out;
1626         }
1627         se_dev->se_dev_ptr = dev;
1628         g_lun0_dev = dev;
1629
1630         return 0;
1631 out:
1632         lun0_su_dev = NULL;
1633         kfree(se_dev);
1634         if (lun0_hba) {
1635                 core_delete_hba(lun0_hba);
1636                 lun0_hba = NULL;
1637         }
1638         return ret;
1639 }
1640
1641
1642 void core_dev_release_virtual_lun0(void)
1643 {
1644         struct se_hba *hba = lun0_hba;
1645         struct se_subsystem_dev *su_dev = lun0_su_dev;
1646
1647         if (!hba)
1648                 return;
1649
1650         if (g_lun0_dev)
1651                 se_free_virtual_device(g_lun0_dev, hba);
1652
1653         kfree(su_dev);
1654         core_delete_hba(hba);
1655 }