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 iSCSI 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 <net/sock.h>
  39 #include <net/tcp.h>
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_device.h>
  42
  43 #include <target/target_core_base.h>
  44 #include <target/target_core_device.h>
  45 #include <target/target_core_tpg.h>
  46 #include <target/target_core_transport.h>
  47 #include <target/target_core_fabric_ops.h>
  48
  49 #include "target_core_alua.h"
  50 #include "target_core_hba.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_ua.h"
  53
  54 static void se_dev_start(struct se_device *dev);
  55 static void se_dev_stop(struct se_device *dev);
  56
  57 int transport_get_lun_for_cmd(
  58         struct se_cmd *se_cmd,
  59         unsigned char *cdb,
  60         u32 unpacked_lun)
  61 {
  62         struct se_dev_entry *deve;
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = SE_SESS(se_cmd);
  65         unsigned long flags;
  66         int read_only = 0;
  67
  68         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
  69         deve = se_cmd->se_deve =
  70                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
  71         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  72                 if (se_cmd) {
  73                         deve->total_cmds++;
  74                         deve->total_bytes += se_cmd->data_length;
  75
  76                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
  77                                 if (deve->lun_flags &
  78                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
  79                                         read_only = 1;
  80                                         goto out;
  81                                 }
  82                                 deve->write_bytes += se_cmd->data_length;
  83                         } else if (se_cmd->data_direction ==
  84                                    DMA_FROM_DEVICE) {
  85                                 deve->read_bytes += se_cmd->data_length;
  86                         }
  87                 }
  88                 deve->deve_cmds++;
  89
  90                 se_lun = se_cmd->se_lun = deve->se_lun;
  91                 se_cmd->pr_res_key = deve->pr_res_key;
  92                 se_cmd->orig_fe_lun = unpacked_lun;
  93                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
  94                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  95         }
  96 out:
  97         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
  98
  99         if (!se_lun) {
 100                 if (read_only) {
 101                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 102                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 103                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
 104                                 " Access for 0x%08x\n",
 105                                 CMD_TFO(se_cmd)->get_fabric_name(),
 106                                 unpacked_lun);
 107                         return -1;
 108                 } else {
 109                         /*
 110                          * Use the se_portal_group->tpg_virt_lun0 to allow for
 111                          * REPORT_LUNS, et al to be returned when no active
 112                          * MappedLUN=0 exists for this Initiator Port.
 113                          */
 114                         if (unpacked_lun != 0) {
 115                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 116                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 117                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 118                                         " Access for 0x%08x\n",
 119                                         CMD_TFO(se_cmd)->get_fabric_name(),
 120                                         unpacked_lun);
 121                                 return -1;
 122                         }
 123                         /*
 124                          * Force WRITE PROTECT for virtual LUN 0
 125                          */
 126                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 127                             (se_cmd->data_direction != DMA_NONE)) {
 128                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 129                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 130                                 return -1;
 131                         }
 132 #if 0
 133                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
 134                                 CMD_TFO(se_cmd)->get_fabric_name());
 135 #endif
 136                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 137                         se_cmd->orig_fe_lun = 0;
 138                         se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 139                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 140                 }
 141         }
 142         /*
 143          * Determine if the struct se_lun is online.
 144          */
 145 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 146         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 147                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 148                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 149                 return -1;
 150         }
 151
 152         {
 153         struct se_device *dev = se_lun->lun_se_dev;
 154         spin_lock_irq(&dev->stats_lock);
 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_irq(&dev->stats_lock);
 161         }
 162
 163         /*
 164          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 165          * for tracking state of struct se_cmds during LUN shutdown events.
 166          */
 167         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 168         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
 169         atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
 170 #if 0
 171         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
 172                 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
 173 #endif
 174         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 175
 176         return 0;
 177 }
 178 EXPORT_SYMBOL(transport_get_lun_for_cmd);
 179
 180 int transport_get_lun_for_tmr(
 181         struct se_cmd *se_cmd,
 182         u32 unpacked_lun)
 183 {
 184         struct se_device *dev = NULL;
 185         struct se_dev_entry *deve;
 186         struct se_lun *se_lun = NULL;
 187         struct se_session *se_sess = SE_SESS(se_cmd);
 188         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 189
 190         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 191         deve = se_cmd->se_deve =
 192                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
 193         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 194                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
 195                 dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
 196                 se_cmd->pr_res_key = deve->pr_res_key;
 197                 se_cmd->orig_fe_lun = unpacked_lun;
 198                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 199 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
 200         }
 201         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 202
 203         if (!se_lun) {
 204                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 205                         " Access for 0x%08x\n",
 206                         CMD_TFO(se_cmd)->get_fabric_name(),
 207                         unpacked_lun);
 208                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 209                 return -1;
 210         }
 211         /*
 212          * Determine if the struct se_lun is online.
 213          */
 214 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 215         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 216                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 217                 return -1;
 218         }
 219
 220         spin_lock(&dev->se_tmr_lock);
 221         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
 222         spin_unlock(&dev->se_tmr_lock);
 223
 224         return 0;
 225 }
 226 EXPORT_SYMBOL(transport_get_lun_for_tmr);
 227
 228 /*
 229  * This function is called from core_scsi3_emulate_pro_register_and_move()
 230  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 231  * when a matching rtpi is found.
 232  */
 233 struct se_dev_entry *core_get_se_deve_from_rtpi(
 234         struct se_node_acl *nacl,
 235         u16 rtpi)
 236 {
 237         struct se_dev_entry *deve;
 238         struct se_lun *lun;
 239         struct se_port *port;
 240         struct se_portal_group *tpg = nacl->se_tpg;
 241         u32 i;
 242
 243         spin_lock_irq(&nacl->device_list_lock);
 244         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 245                 deve = &nacl->device_list[i];
 246
 247                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 248                         continue;
 249
 250                 lun = deve->se_lun;
 251                 if (!(lun)) {
 252                         printk(KERN_ERR "%s device entries device pointer is"
 253                                 " NULL, but Initiator has access.\n",
 254                                 TPG_TFO(tpg)->get_fabric_name());
 255                         continue;
 256                 }
 257                 port = lun->lun_sep;
 258                 if (!(port)) {
 259                         printk(KERN_ERR "%s device entries device pointer is"
 260                                 " NULL, but Initiator has access.\n",
 261                                 TPG_TFO(tpg)->get_fabric_name());
 262                         continue;
 263                 }
 264                 if (port->sep_rtpi != rtpi)
 265                         continue;
 266
 267                 atomic_inc(&deve->pr_ref_count);
 268                 smp_mb__after_atomic_inc();
 269                 spin_unlock_irq(&nacl->device_list_lock);
 270
 271                 return deve;
 272         }
 273         spin_unlock_irq(&nacl->device_list_lock);
 274
 275         return NULL;
 276 }
 277
 278 int core_free_device_list_for_node(
 279         struct se_node_acl *nacl,
 280         struct se_portal_group *tpg)
 281 {
 282         struct se_dev_entry *deve;
 283         struct se_lun *lun;
 284         u32 i;
 285
 286         if (!nacl->device_list)
 287                 return 0;
 288
 289         spin_lock_irq(&nacl->device_list_lock);
 290         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 291                 deve = &nacl->device_list[i];
 292
 293                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 294                         continue;
 295
 296                 if (!deve->se_lun) {
 297                         printk(KERN_ERR "%s device entries device pointer is"
 298                                 " NULL, but Initiator has access.\n",
 299                                 TPG_TFO(tpg)->get_fabric_name());
 300                         continue;
 301                 }
 302                 lun = deve->se_lun;
 303
 304                 spin_unlock_irq(&nacl->device_list_lock);
 305                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 306                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 307                 spin_lock_irq(&nacl->device_list_lock);
 308         }
 309         spin_unlock_irq(&nacl->device_list_lock);
 310
 311         kfree(nacl->device_list);
 312         nacl->device_list = NULL;
 313
 314         return 0;
 315 }
 316
 317 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 318 {
 319         struct se_dev_entry *deve;
 320
 321         spin_lock_irq(&se_nacl->device_list_lock);
 322         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 323         deve->deve_cmds--;
 324         spin_unlock_irq(&se_nacl->device_list_lock);
 325
 326         return;
 327 }
 328
 329 void core_update_device_list_access(
 330         u32 mapped_lun,
 331         u32 lun_access,
 332         struct se_node_acl *nacl)
 333 {
 334         struct se_dev_entry *deve;
 335
 336         spin_lock_irq(&nacl->device_list_lock);
 337         deve = &nacl->device_list[mapped_lun];
 338         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 341         } else {
 342                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 343                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 344         }
 345         spin_unlock_irq(&nacl->device_list_lock);
 346
 347         return;
 348 }
 349
 350 /*      core_update_device_list_for_node():
 351  *
 352  *
 353  */
 354 int core_update_device_list_for_node(
 355         struct se_lun *lun,
 356         struct se_lun_acl *lun_acl,
 357         u32 mapped_lun,
 358         u32 lun_access,
 359         struct se_node_acl *nacl,
 360         struct se_portal_group *tpg,
 361         int enable)
 362 {
 363         struct se_port *port = lun->lun_sep;
 364         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 365         int trans = 0;
 366         /*
 367          * If the MappedLUN entry is being disabled, the entry in
 368          * port->sep_alua_list must be removed now before clearing the
 369          * struct se_dev_entry pointers below as logic in
 370          * core_alua_do_transition_tg_pt() depends on these being present.
 371          */
 372         if (!(enable)) {
 373                 /*
 374                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 375                  * that have not been explicitly concerted to MappedLUNs ->
 376                  * struct se_lun_acl, but we remove deve->alua_port_list from
 377                  * port->sep_alua_list. This also means that active UAs and
 378                  * NodeACL context specific PR metadata for demo-mode
 379                  * MappedLUN *deve will be released below..
 380                  */
 381                 spin_lock_bh(&port->sep_alua_lock);
 382                 list_del(&deve->alua_port_list);
 383                 spin_unlock_bh(&port->sep_alua_lock);
 384         }
 385
 386         spin_lock_irq(&nacl->device_list_lock);
 387         if (enable) {
 388                 /*
 389                  * Check if the call is handling demo mode -> explict LUN ACL
 390                  * transition.  This transition must be for the same struct se_lun
 391                  * + mapped_lun that was setup in demo mode..
 392                  */
 393                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 394                         if (deve->se_lun_acl != NULL) {
 395                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
 396                                         " already set for demo mode -> explict"
 397                                         " LUN ACL transition\n");
 398                                 spin_unlock_irq(&nacl->device_list_lock);
 399                                 return -1;
 400                         }
 401                         if (deve->se_lun != lun) {
 402                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
 403                                         " match passed struct se_lun for demo mode"
 404                                         " -> explict LUN ACL transition\n");
 405                                 spin_unlock_irq(&nacl->device_list_lock);
 406                                 return -1;
 407                         }
 408                         deve->se_lun_acl = lun_acl;
 409                         trans = 1;
 410                 } else {
 411                         deve->se_lun = lun;
 412                         deve->se_lun_acl = lun_acl;
 413                         deve->mapped_lun = mapped_lun;
 414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 415                 }
 416
 417                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 418                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 419                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 420                 } else {
 421                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 422                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 423                 }
 424
 425                 if (trans) {
 426                         spin_unlock_irq(&nacl->device_list_lock);
 427                         return 0;
 428                 }
 429                 deve->creation_time = get_jiffies_64();
 430                 deve->attach_count++;
 431                 spin_unlock_irq(&nacl->device_list_lock);
 432
 433                 spin_lock_bh(&port->sep_alua_lock);
 434                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 435                 spin_unlock_bh(&port->sep_alua_lock);
 436
 437                 return 0;
 438         }
 439         /*
 440          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 441          * PR operation to complete.
 442          */
 443         spin_unlock_irq(&nacl->device_list_lock);
 444         while (atomic_read(&deve->pr_ref_count) != 0)
 445                 cpu_relax();
 446         spin_lock_irq(&nacl->device_list_lock);
 447         /*
 448          * Disable struct se_dev_entry LUN ACL mapping
 449          */
 450         core_scsi3_ua_release_all(deve);
 451         deve->se_lun = NULL;
 452         deve->se_lun_acl = NULL;
 453         deve->lun_flags = 0;
 454         deve->creation_time = 0;
 455         deve->attach_count--;
 456         spin_unlock_irq(&nacl->device_list_lock);
 457
 458         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 459         return 0;
 460 }
 461
 462 /*      core_clear_lun_from_tpg():
 463  *
 464  *
 465  */
 466 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 467 {
 468         struct se_node_acl *nacl;
 469         struct se_dev_entry *deve;
 470         u32 i;
 471
 472         spin_lock_bh(&tpg->acl_node_lock);
 473         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 474                 spin_unlock_bh(&tpg->acl_node_lock);
 475
 476                 spin_lock_irq(&nacl->device_list_lock);
 477                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 478                         deve = &nacl->device_list[i];
 479                         if (lun != deve->se_lun)
 480                                 continue;
 481                         spin_unlock_irq(&nacl->device_list_lock);
 482
 483                         core_update_device_list_for_node(lun, NULL,
 484                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 485                                 nacl, tpg, 0);
 486
 487                         spin_lock_irq(&nacl->device_list_lock);
 488                 }
 489                 spin_unlock_irq(&nacl->device_list_lock);
 490
 491                 spin_lock_bh(&tpg->acl_node_lock);
 492         }
 493         spin_unlock_bh(&tpg->acl_node_lock);
 494
 495         return;
 496 }
 497
 498 static struct se_port *core_alloc_port(struct se_device *dev)
 499 {
 500         struct se_port *port, *port_tmp;
 501
 502         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 503         if (!(port)) {
 504                 printk(KERN_ERR "Unable to allocate struct se_port\n");
 505                 return NULL;
 506         }
 507         INIT_LIST_HEAD(&port->sep_alua_list);
 508         INIT_LIST_HEAD(&port->sep_list);
 509         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 510         spin_lock_init(&port->sep_alua_lock);
 511         mutex_init(&port->sep_tg_pt_md_mutex);
 512
 513         spin_lock(&dev->se_port_lock);
 514         if (dev->dev_port_count == 0x0000ffff) {
 515                 printk(KERN_WARNING "Reached dev->dev_port_count =="
 516                                 " 0x0000ffff\n");
 517                 spin_unlock(&dev->se_port_lock);
 518                 return NULL;
 519         }
 520 again:
 521         /*
 522          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 523          * Here is the table from spc4r17 section 7.7.3.8.
 524          *
 525          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 526          *
 527          * Code      Description
 528          * 0h        Reserved
 529          * 1h        Relative port 1, historically known as port A
 530          * 2h        Relative port 2, historically known as port B
 531          * 3h to FFFFh    Relative port 3 through 65 535
 532          */
 533         port->sep_rtpi = dev->dev_rpti_counter++;
 534         if (!(port->sep_rtpi))
 535                 goto again;
 536
 537         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 538                 /*
 539                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 540                  * for 16-bit wrap..
 541                  */
 542                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 543                         goto again;
 544         }
 545         spin_unlock(&dev->se_port_lock);
 546
 547         return port;
 548 }
 549
 550 static void core_export_port(
 551         struct se_device *dev,
 552         struct se_portal_group *tpg,
 553         struct se_port *port,
 554         struct se_lun *lun)
 555 {
 556         struct se_subsystem_dev *su_dev = SU_DEV(dev);
 557         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 558
 559         spin_lock(&dev->se_port_lock);
 560         spin_lock(&lun->lun_sep_lock);
 561         port->sep_tpg = tpg;
 562         port->sep_lun = lun;
 563         lun->lun_sep = port;
 564         spin_unlock(&lun->lun_sep_lock);
 565
 566         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 567         spin_unlock(&dev->se_port_lock);
 568
 569         if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
 570                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 571                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 572                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
 573                                         "_gp_member_t\n");
 574                         return;
 575                 }
 576                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 577                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 578                         T10_ALUA(su_dev)->default_tg_pt_gp);
 579                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 580                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
 581                         " Group: alua/default_tg_pt_gp\n",
 582                         TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
 583         }
 584
 585         dev->dev_port_count++;
 586         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 587 }
 588
 589 /*
 590  *      Called with struct se_device->se_port_lock spinlock held.
 591  */
 592 static void core_release_port(struct se_device *dev, struct se_port *port)
 593         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 594 {
 595         /*
 596          * Wait for any port reference for PR ALL_TG_PT=1 operation
 597          * to complete in __core_scsi3_alloc_registration()
 598          */
 599         spin_unlock(&dev->se_port_lock);
 600         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 601                 cpu_relax();
 602         spin_lock(&dev->se_port_lock);
 603
 604         core_alua_free_tg_pt_gp_mem(port);
 605
 606         list_del(&port->sep_list);
 607         dev->dev_port_count--;
 608         kfree(port);
 609
 610         return;
 611 }
 612
 613 int core_dev_export(
 614         struct se_device *dev,
 615         struct se_portal_group *tpg,
 616         struct se_lun *lun)
 617 {
 618         struct se_port *port;
 619
 620         port = core_alloc_port(dev);
 621         if (!(port))
 622                 return -1;
 623
 624         lun->lun_se_dev = dev;
 625         se_dev_start(dev);
 626
 627         atomic_inc(&dev->dev_export_obj.obj_access_count);
 628         core_export_port(dev, tpg, port, lun);
 629         return 0;
 630 }
 631
 632 void core_dev_unexport(
 633         struct se_device *dev,
 634         struct se_portal_group *tpg,
 635         struct se_lun *lun)
 636 {
 637         struct se_port *port = lun->lun_sep;
 638
 639         spin_lock(&lun->lun_sep_lock);
 640         if (lun->lun_se_dev == NULL) {
 641                 spin_unlock(&lun->lun_sep_lock);
 642                 return;
 643         }
 644         spin_unlock(&lun->lun_sep_lock);
 645
 646         spin_lock(&dev->se_port_lock);
 647         atomic_dec(&dev->dev_export_obj.obj_access_count);
 648         core_release_port(dev, port);
 649         spin_unlock(&dev->se_port_lock);
 650
 651         se_dev_stop(dev);
 652         lun->lun_se_dev = NULL;
 653 }
 654
 655 int transport_core_report_lun_response(struct se_cmd *se_cmd)
 656 {
 657         struct se_dev_entry *deve;
 658         struct se_lun *se_lun;
 659         struct se_session *se_sess = SE_SESS(se_cmd);
 660         struct se_task *se_task;
 661         unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
 662         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 663
 664         list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
 665                 break;
 666
 667         if (!(se_task)) {
 668                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
 669                 return PYX_TRANSPORT_LU_COMM_FAILURE;
 670         }
 671
 672         /*
 673          * If no struct se_session pointer is present, this struct se_cmd is
 674          * coming via a target_core_mod PASSTHROUGH op, and not through
 675          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 676          */
 677         if (!(se_sess)) {
 678                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 679                 lun_count = 1;
 680                 goto done;
 681         }
 682
 683         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 684         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 685                 deve = &SE_NODE_ACL(se_sess)->device_list[i];
 686                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 687                         continue;
 688                 se_lun = deve->se_lun;
 689                 /*
 690                  * We determine the correct LUN LIST LENGTH even once we
 691                  * have reached the initial allocation length.
 692                  * See SPC2-R20 7.19.
 693                  */
 694                 lun_count++;
 695                 if ((cdb_offset + 8) >= se_cmd->data_length)
 696                         continue;
 697
 698                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 699                 offset += 8;
 700                 cdb_offset += 8;
 701         }
 702         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 703
 704         /*
 705          * See SPC3 r07, page 159.
 706          */
 707 done:
 708         lun_count *= 8;
 709         buf[0] = ((lun_count >> 24) & 0xff);
 710         buf[1] = ((lun_count >> 16) & 0xff);
 711         buf[2] = ((lun_count >> 8) & 0xff);
 712         buf[3] = (lun_count & 0xff);
 713
 714         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 715 }
 716
 717 /*      se_release_device_for_hba():
 718  *
 719  *
 720  */
 721 void se_release_device_for_hba(struct se_device *dev)
 722 {
 723         struct se_hba *hba = dev->se_hba;
 724
 725         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 726             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 727             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 728             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 729             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 730                 se_dev_stop(dev);
 731
 732         if (dev->dev_ptr) {
 733                 kthread_stop(dev->process_thread);
 734                 if (dev->transport->free_device)
 735                         dev->transport->free_device(dev->dev_ptr);
 736         }
 737
 738         spin_lock(&hba->device_lock);
 739         list_del(&dev->dev_list);
 740         hba->dev_count--;
 741         spin_unlock(&hba->device_lock);
 742
 743         core_scsi3_free_all_registrations(dev);
 744         se_release_vpd_for_dev(dev);
 745
 746         kfree(dev->dev_status_queue_obj);
 747         kfree(dev->dev_queue_obj);
 748         kfree(dev);
 749
 750         return;
 751 }
 752
 753 void se_release_vpd_for_dev(struct se_device *dev)
 754 {
 755         struct t10_vpd *vpd, *vpd_tmp;
 756
 757         spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 758         list_for_each_entry_safe(vpd, vpd_tmp,
 759                         &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
 760                 list_del(&vpd->vpd_list);
 761                 kfree(vpd);
 762         }
 763         spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 764
 765         return;
 766 }
 767
 768 /*      se_free_virtual_device():
 769  *
 770  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 771  */
 772 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 773 {
 774         if (!list_empty(&dev->dev_sep_list))
 775                 dump_stack();
 776
 777         core_alua_free_lu_gp_mem(dev);
 778         se_release_device_for_hba(dev);
 779
 780         return 0;
 781 }
 782
 783 static void se_dev_start(struct se_device *dev)
 784 {
 785         struct se_hba *hba = dev->se_hba;
 786
 787         spin_lock(&hba->device_lock);
 788         atomic_inc(&dev->dev_obj.obj_access_count);
 789         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 790                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 791                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 792                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 793                 } else if (dev->dev_status &
 794                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 795                         dev->dev_status &=
 796                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 797                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 798                 }
 799         }
 800         spin_unlock(&hba->device_lock);
 801 }
 802
 803 static void se_dev_stop(struct se_device *dev)
 804 {
 805         struct se_hba *hba = dev->se_hba;
 806
 807         spin_lock(&hba->device_lock);
 808         atomic_dec(&dev->dev_obj.obj_access_count);
 809         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 810                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 811                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 812                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 813                 } else if (dev->dev_status &
 814                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 815                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 816                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 817                 }
 818         }
 819         spin_unlock(&hba->device_lock);
 820 }
 821
 822 int se_dev_check_online(struct se_device *dev)
 823 {
 824         int ret;
 825
 826         spin_lock_irq(&dev->dev_status_lock);
 827         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 828                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 829         spin_unlock_irq(&dev->dev_status_lock);
 830
 831         return ret;
 832 }
 833
 834 int se_dev_check_shutdown(struct se_device *dev)
 835 {
 836         int ret;
 837
 838         spin_lock_irq(&dev->dev_status_lock);
 839         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 840         spin_unlock_irq(&dev->dev_status_lock);
 841
 842         return ret;
 843 }
 844
 845 void se_dev_set_default_attribs(
 846         struct se_device *dev,
 847         struct se_dev_limits *dev_limits)
 848 {
 849         struct queue_limits *limits = &dev_limits->limits;
 850
 851         DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
 852         DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
 853         DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
 854         DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 855         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 856         DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
 857         DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
 858         DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
 859         DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
 860         DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
 861         DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 862         /*
 863          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 864          * iblock_create_virtdevice() from struct queue_limits values
 865          * if blk_queue_discard()==1
 866          */
 867         DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 868         DEV_ATTRIB(dev)->max_unmap_block_desc_count =
 869                                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 870         DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 871         DEV_ATTRIB(dev)->unmap_granularity_alignment =
 872                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 873         /*
 874          * block_size is based on subsystem plugin dependent requirements.
 875          */
 876         DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
 877         DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
 878         /*
 879          * max_sectors is based on subsystem plugin dependent requirements.
 880          */
 881         DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
 882         DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
 883         /*
 884          * Set optimal_sectors from max_sectors, which can be lowered via
 885          * configfs.
 886          */
 887         DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
 888         /*
 889          * queue_depth is based on subsystem plugin dependent requirements.
 890          */
 891         DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
 892         DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
 893 }
 894
 895 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
 896 {
 897         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
 898                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
 899                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
 900                 return -1;
 901         } else {
 902                 DEV_ATTRIB(dev)->task_timeout = task_timeout;
 903                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
 904                         dev, task_timeout);
 905         }
 906
 907         return 0;
 908 }
 909
 910 int se_dev_set_max_unmap_lba_count(
 911         struct se_device *dev,
 912         u32 max_unmap_lba_count)
 913 {
 914         DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
 915         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
 916                         dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
 917         return 0;
 918 }
 919
 920 int se_dev_set_max_unmap_block_desc_count(
 921         struct se_device *dev,
 922         u32 max_unmap_block_desc_count)
 923 {
 924         DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
 925         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
 926                         dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
 927         return 0;
 928 }
 929
 930 int se_dev_set_unmap_granularity(
 931         struct se_device *dev,
 932         u32 unmap_granularity)
 933 {
 934         DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
 935         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
 936                         dev, DEV_ATTRIB(dev)->unmap_granularity);
 937         return 0;
 938 }
 939
 940 int se_dev_set_unmap_granularity_alignment(
 941         struct se_device *dev,
 942         u32 unmap_granularity_alignment)
 943 {
 944         DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
 945         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
 946                         dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
 947         return 0;
 948 }
 949
 950 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 951 {
 952         if ((flag != 0) && (flag != 1)) {
 953                 printk(KERN_ERR "Illegal value %d\n", flag);
 954                 return -1;
 955         }
 956         if (TRANSPORT(dev)->dpo_emulated == NULL) {
 957                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
 958                 return -1;
 959         }
 960         if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
 961                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
 962                 return -1;
 963         }
 964         DEV_ATTRIB(dev)->emulate_dpo = flag;
 965         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
 966                         " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
 967         return 0;
 968 }
 969
 970 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 971 {
 972         if ((flag != 0) && (flag != 1)) {
 973                 printk(KERN_ERR "Illegal value %d\n", flag);
 974                 return -1;
 975         }
 976         if (TRANSPORT(dev)->fua_write_emulated == NULL) {
 977                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
 978                 return -1;
 979         }
 980         if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
 981                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
 982                 return -1;
 983         }
 984         DEV_ATTRIB(dev)->emulate_fua_write = flag;
 985         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 986                         dev, DEV_ATTRIB(dev)->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                 printk(KERN_ERR "Illegal value %d\n", flag);
 994                 return -1;
 995         }
 996         if (TRANSPORT(dev)->fua_read_emulated == NULL) {
 997                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
 998                 return -1;
 999         }
1000         if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1001                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1002                 return -1;
1003         }
1004         DEV_ATTRIB(dev)->emulate_fua_read = flag;
1005         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1006                         dev, DEV_ATTRIB(dev)->emulate_fua_read);
1007         return 0;
1008 }
1009
1010 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1011 {
1012         if ((flag != 0) && (flag != 1)) {
1013                 printk(KERN_ERR "Illegal value %d\n", flag);
1014                 return -1;
1015         }
1016         if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1017                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1018                 return -1;
1019         }
1020         if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1021                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1022                 return -1;
1023         }
1024         DEV_ATTRIB(dev)->emulate_write_cache = flag;
1025         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1026                         dev, DEV_ATTRIB(dev)->emulate_write_cache);
1027         return 0;
1028 }
1029
1030 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1031 {
1032         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1033                 printk(KERN_ERR "Illegal value %d\n", flag);
1034                 return -1;
1035         }
1036
1037         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1038                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1039                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1040                         " exists\n", dev,
1041                         atomic_read(&dev->dev_export_obj.obj_access_count));
1042                 return -1;
1043         }
1044         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1045         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1046                 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1047
1048         return 0;
1049 }
1050
1051 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1052 {
1053         if ((flag != 0) && (flag != 1)) {
1054                 printk(KERN_ERR "Illegal value %d\n", flag);
1055                 return -1;
1056         }
1057
1058         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1059                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1060                         " dev_export_obj: %d count exists\n", dev,
1061                         atomic_read(&dev->dev_export_obj.obj_access_count));
1062                 return -1;
1063         }
1064         DEV_ATTRIB(dev)->emulate_tas = flag;
1065         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1066                 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1067
1068         return 0;
1069 }
1070
1071 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1072 {
1073         if ((flag != 0) && (flag != 1)) {
1074                 printk(KERN_ERR "Illegal value %d\n", flag);
1075                 return -1;
1076         }
1077         /*
1078          * We expect this value to be non-zero when generic Block Layer
1079          * Discard supported is detected iblock_create_virtdevice().
1080          */
1081         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1082                 printk(KERN_ERR "Generic Block Discard not supported\n");
1083                 return -ENOSYS;
1084         }
1085
1086         DEV_ATTRIB(dev)->emulate_tpu = flag;
1087         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1088                                 dev, flag);
1089         return 0;
1090 }
1091
1092 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1093 {
1094         if ((flag != 0) && (flag != 1)) {
1095                 printk(KERN_ERR "Illegal value %d\n", flag);
1096                 return -1;
1097         }
1098         /*
1099          * We expect this value to be non-zero when generic Block Layer
1100          * Discard supported is detected iblock_create_virtdevice().
1101          */
1102         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1103                 printk(KERN_ERR "Generic Block Discard not supported\n");
1104                 return -ENOSYS;
1105         }
1106
1107         DEV_ATTRIB(dev)->emulate_tpws = flag;
1108         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1109                                 dev, flag);
1110         return 0;
1111 }
1112
1113 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1114 {
1115         if ((flag != 0) && (flag != 1)) {
1116                 printk(KERN_ERR "Illegal value %d\n", flag);
1117                 return -1;
1118         }
1119         DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1120         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1121                 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1122         return 0;
1123 }
1124
1125 /*
1126  * Note, this can only be called on unexported SE Device Object.
1127  */
1128 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1129 {
1130         u32 orig_queue_depth = dev->queue_depth;
1131
1132         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1133                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1134                         " dev_export_obj: %d count exists\n", dev,
1135                         atomic_read(&dev->dev_export_obj.obj_access_count));
1136                 return -1;
1137         }
1138         if (!(queue_depth)) {
1139                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1140                         "_depth\n", dev);
1141                 return -1;
1142         }
1143
1144         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1145                 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1146                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1147                                 " exceeds TCM/SE_Device TCQ: %u\n",
1148                                 dev, queue_depth,
1149                                 DEV_ATTRIB(dev)->hw_queue_depth);
1150                         return -1;
1151                 }
1152         } else {
1153                 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1154                         if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1155                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1156                                         " %u exceeds TCM/SE_Device MAX"
1157                                         " TCQ: %u\n", dev, queue_depth,
1158                                         DEV_ATTRIB(dev)->hw_queue_depth);
1159                                 return -1;
1160                         }
1161                 }
1162         }
1163
1164         DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1165         if (queue_depth > orig_queue_depth)
1166                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1167         else if (queue_depth < orig_queue_depth)
1168                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1169
1170         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1171                         dev, queue_depth);
1172         return 0;
1173 }
1174
1175 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1176 {
1177         int force = 0; /* Force setting for VDEVS */
1178
1179         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1180                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1181                         " max_sectors while dev_export_obj: %d count exists\n",
1182                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1183                 return -1;
1184         }
1185         if (!(max_sectors)) {
1186                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1187                         " max_sectors\n", dev);
1188                 return -1;
1189         }
1190         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1191                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1192                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1193                                 DA_STATUS_MAX_SECTORS_MIN);
1194                 return -1;
1195         }
1196         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1197                 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1198                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1199                                 " greater than TCM/SE_Device max_sectors:"
1200                                 " %u\n", dev, max_sectors,
1201                                 DEV_ATTRIB(dev)->hw_max_sectors);
1202                          return -1;
1203                 }
1204         } else {
1205                 if (!(force) && (max_sectors >
1206                                  DEV_ATTRIB(dev)->hw_max_sectors)) {
1207                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1208                                 " greater than TCM/SE_Device max_sectors"
1209                                 ": %u, use force=1 to override.\n", dev,
1210                                 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1211                         return -1;
1212                 }
1213                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1214                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1215                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1216                                 " %u\n", dev, max_sectors,
1217                                 DA_STATUS_MAX_SECTORS_MAX);
1218                         return -1;
1219                 }
1220         }
1221
1222         DEV_ATTRIB(dev)->max_sectors = max_sectors;
1223         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1224                         dev, max_sectors);
1225         return 0;
1226 }
1227
1228 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1229 {
1230         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1231                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1232                         " optimal_sectors while dev_export_obj: %d count exists\n",
1233                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1234                 return -EINVAL;
1235         }
1236         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1237                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1238                                 " changed for TCM/pSCSI\n", dev);
1239                 return -EINVAL;
1240         }
1241         if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1242                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1243                         " greater than max_sectors: %u\n", dev,
1244                         optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1245                 return -EINVAL;
1246         }
1247
1248         DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1249         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1250                         dev, optimal_sectors);
1251         return 0;
1252 }
1253
1254 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1255 {
1256         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1257                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1258                         " while dev_export_obj: %d count exists\n", dev,
1259                         atomic_read(&dev->dev_export_obj.obj_access_count));
1260                 return -1;
1261         }
1262
1263         if ((block_size != 512) &&
1264             (block_size != 1024) &&
1265             (block_size != 2048) &&
1266             (block_size != 4096)) {
1267                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1268                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1269                         dev, block_size);
1270                 return -1;
1271         }
1272
1273         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1274                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1275                         " Physical Device, use for Linux/SCSI to change"
1276                         " block_size for underlying hardware\n", dev);
1277                 return -1;
1278         }
1279
1280         DEV_ATTRIB(dev)->block_size = block_size;
1281         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1282                         dev, block_size);
1283         return 0;
1284 }
1285
1286 struct se_lun *core_dev_add_lun(
1287         struct se_portal_group *tpg,
1288         struct se_hba *hba,
1289         struct se_device *dev,
1290         u32 lun)
1291 {
1292         struct se_lun *lun_p;
1293         u32 lun_access = 0;
1294
1295         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1296                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1297                         atomic_read(&dev->dev_access_obj.obj_access_count));
1298                 return NULL;
1299         }
1300
1301         lun_p = core_tpg_pre_addlun(tpg, lun);
1302         if ((IS_ERR(lun_p)) || !(lun_p))
1303                 return NULL;
1304
1305         if (dev->dev_flags & DF_READ_ONLY)
1306                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1307         else
1308                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1309
1310         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1311                 return NULL;
1312
1313         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1314                 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1315                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1316                 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1317         /*
1318          * Update LUN maps for dynamically added initiators when
1319          * generate_node_acl is enabled.
1320          */
1321         if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1322                 struct se_node_acl *acl;
1323                 spin_lock_bh(&tpg->acl_node_lock);
1324                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1325                         if (acl->dynamic_node_acl) {
1326                                 spin_unlock_bh(&tpg->acl_node_lock);
1327                                 core_tpg_add_node_to_devs(acl, tpg);
1328                                 spin_lock_bh(&tpg->acl_node_lock);
1329                         }
1330                 }
1331                 spin_unlock_bh(&tpg->acl_node_lock);
1332         }
1333
1334         return lun_p;
1335 }
1336
1337 /*      core_dev_del_lun():
1338  *
1339  *
1340  */
1341 int core_dev_del_lun(
1342         struct se_portal_group *tpg,
1343         u32 unpacked_lun)
1344 {
1345         struct se_lun *lun;
1346         int ret = 0;
1347
1348         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1349         if (!(lun))
1350                 return ret;
1351
1352         core_tpg_post_dellun(tpg, lun);
1353
1354         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1355                 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1356                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1357                 TPG_TFO(tpg)->get_fabric_name());
1358
1359         return 0;
1360 }
1361
1362 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1363 {
1364         struct se_lun *lun;
1365
1366         spin_lock(&tpg->tpg_lun_lock);
1367         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1368                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1369                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1370                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1371                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1372                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1373                 spin_unlock(&tpg->tpg_lun_lock);
1374                 return NULL;
1375         }
1376         lun = &tpg->tpg_lun_list[unpacked_lun];
1377
1378         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1379                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1380                         " Target Portal Group: %hu, ignoring request.\n",
1381                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1382                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1383                 spin_unlock(&tpg->tpg_lun_lock);
1384                 return NULL;
1385         }
1386         spin_unlock(&tpg->tpg_lun_lock);
1387
1388         return lun;
1389 }
1390
1391 /*      core_dev_get_lun():
1392  *
1393  *
1394  */
1395 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1396 {
1397         struct se_lun *lun;
1398
1399         spin_lock(&tpg->tpg_lun_lock);
1400         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1401                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1402                         "_TPG-1: %u for Target Portal Group: %hu\n",
1403                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1404                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1405                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1406                 spin_unlock(&tpg->tpg_lun_lock);
1407                 return NULL;
1408         }
1409         lun = &tpg->tpg_lun_list[unpacked_lun];
1410
1411         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1412                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1413                         " Target Portal Group: %hu, ignoring request.\n",
1414                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1415                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1416                 spin_unlock(&tpg->tpg_lun_lock);
1417                 return NULL;
1418         }
1419         spin_unlock(&tpg->tpg_lun_lock);
1420
1421         return lun;
1422 }
1423
1424 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1425         struct se_portal_group *tpg,
1426         u32 mapped_lun,
1427         char *initiatorname,
1428         int *ret)
1429 {
1430         struct se_lun_acl *lacl;
1431         struct se_node_acl *nacl;
1432
1433         if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1434                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1435                         TPG_TFO(tpg)->get_fabric_name());
1436                 *ret = -EOVERFLOW;
1437                 return NULL;
1438         }
1439         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1440         if (!(nacl)) {
1441                 *ret = -EINVAL;
1442                 return NULL;
1443         }
1444         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1445         if (!(lacl)) {
1446                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1447                 *ret = -ENOMEM;
1448                 return NULL;
1449         }
1450
1451         INIT_LIST_HEAD(&lacl->lacl_list);
1452         lacl->mapped_lun = mapped_lun;
1453         lacl->se_lun_nacl = nacl;
1454         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1455
1456         return lacl;
1457 }
1458
1459 int core_dev_add_initiator_node_lun_acl(
1460         struct se_portal_group *tpg,
1461         struct se_lun_acl *lacl,
1462         u32 unpacked_lun,
1463         u32 lun_access)
1464 {
1465         struct se_lun *lun;
1466         struct se_node_acl *nacl;
1467
1468         lun = core_dev_get_lun(tpg, unpacked_lun);
1469         if (!(lun)) {
1470                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1471                         " Target Portal Group: %hu, ignoring request.\n",
1472                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1473                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1474                 return -EINVAL;
1475         }
1476
1477         nacl = lacl->se_lun_nacl;
1478         if (!(nacl))
1479                 return -EINVAL;
1480
1481         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1482             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1483                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1484
1485         lacl->se_lun = lun;
1486
1487         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1488                         lun_access, nacl, tpg, 1) < 0)
1489                 return -EINVAL;
1490
1491         spin_lock(&lun->lun_acl_lock);
1492         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1493         atomic_inc(&lun->lun_acl_count);
1494         smp_mb__after_atomic_inc();
1495         spin_unlock(&lun->lun_acl_lock);
1496
1497         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1498                 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1499                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1500                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1501                 lacl->initiatorname);
1502         /*
1503          * Check to see if there are any existing persistent reservation APTPL
1504          * pre-registrations that need to be enabled for this LUN ACL..
1505          */
1506         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1507         return 0;
1508 }
1509
1510 /*      core_dev_del_initiator_node_lun_acl():
1511  *
1512  *
1513  */
1514 int core_dev_del_initiator_node_lun_acl(
1515         struct se_portal_group *tpg,
1516         struct se_lun *lun,
1517         struct se_lun_acl *lacl)
1518 {
1519         struct se_node_acl *nacl;
1520
1521         nacl = lacl->se_lun_nacl;
1522         if (!(nacl))
1523                 return -EINVAL;
1524
1525         spin_lock(&lun->lun_acl_lock);
1526         list_del(&lacl->lacl_list);
1527         atomic_dec(&lun->lun_acl_count);
1528         smp_mb__after_atomic_dec();
1529         spin_unlock(&lun->lun_acl_lock);
1530
1531         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1532                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1533
1534         lacl->se_lun = NULL;
1535
1536         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1537                 " InitiatorNode: %s Mapped LUN: %u\n",
1538                 TPG_TFO(tpg)->get_fabric_name(),
1539                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1540                 lacl->initiatorname, lacl->mapped_lun);
1541
1542         return 0;
1543 }
1544
1545 void core_dev_free_initiator_node_lun_acl(
1546         struct se_portal_group *tpg,
1547         struct se_lun_acl *lacl)
1548 {
1549         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1550                 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1551                 TPG_TFO(tpg)->tpg_get_tag(tpg),
1552                 TPG_TFO(tpg)->get_fabric_name(),
1553                 lacl->initiatorname, lacl->mapped_lun);
1554
1555         kfree(lacl);
1556 }
1557
1558 int core_dev_setup_virtual_lun0(void)
1559 {
1560         struct se_hba *hba;
1561         struct se_device *dev;
1562         struct se_subsystem_dev *se_dev = NULL;
1563         struct se_subsystem_api *t;
1564         char buf[16];
1565         int ret;
1566
1567         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1568         if (IS_ERR(hba))
1569                 return PTR_ERR(hba);
1570
1571         se_global->g_lun0_hba = hba;
1572         t = hba->transport;
1573
1574         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1575         if (!(se_dev)) {
1576                 printk(KERN_ERR "Unable to allocate memory for"
1577                                 " struct se_subsystem_dev\n");
1578                 ret = -ENOMEM;
1579                 goto out;
1580         }
1581         INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1582         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1583         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1584         INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1585         INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1586         spin_lock_init(&se_dev->t10_reservation.registration_lock);
1587         spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1588         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1589         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1590         spin_lock_init(&se_dev->se_dev_lock);
1591         se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1592         se_dev->t10_wwn.t10_sub_dev = se_dev;
1593         se_dev->t10_alua.t10_sub_dev = se_dev;
1594         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1595         se_dev->se_dev_hba = hba;
1596
1597         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1598         if (!(se_dev->se_dev_su_ptr)) {
1599                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1600                         " from allocate_virtdevice()\n");
1601                 ret = -ENOMEM;
1602                 goto out;
1603         }
1604         se_global->g_lun0_su_dev = se_dev;
1605
1606         memset(buf, 0, 16);
1607         sprintf(buf, "rd_pages=8");
1608         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1609
1610         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1611         if (!(dev) || IS_ERR(dev)) {
1612                 ret = -ENOMEM;
1613                 goto out;
1614         }
1615         se_dev->se_dev_ptr = dev;
1616         se_global->g_lun0_dev = dev;
1617
1618         return 0;
1619 out:
1620         se_global->g_lun0_su_dev = NULL;
1621         kfree(se_dev);
1622         if (se_global->g_lun0_hba) {
1623                 core_delete_hba(se_global->g_lun0_hba);
1624                 se_global->g_lun0_hba = NULL;
1625         }
1626         return ret;
1627 }
1628
1629
1630 void core_dev_release_virtual_lun0(void)
1631 {
1632         struct se_hba *hba = se_global->g_lun0_hba;
1633         struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1634
1635         if (!(hba))
1636                 return;
1637
1638         if (se_global->g_lun0_dev)
1639                 se_free_virtual_device(se_global->g_lun0_dev, hba);
1640
1641         kfree(su_dev);
1642         core_delete_hba(hba);
1643 }