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
  42 #include <target/target_core_base.h>
  43 #include <target/target_core_device.h>
  44 #include <target/target_core_tpg.h>
  45 #include <target/target_core_transport.h>
  46 #include <target/target_core_fabric_ops.h>
  47
  48 #include "target_core_alua.h"
  49 #include "target_core_hba.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 int transport_get_lun_for_cmd(
  57         struct se_cmd *se_cmd,
  58         unsigned char *cdb,
  59         u32 unpacked_lun)
  60 {
  61         struct se_dev_entry *deve;
  62         struct se_lun *se_lun = NULL;
  63         struct se_session *se_sess = SE_SESS(se_cmd);
  64         unsigned long flags;
  65         int read_only = 0;
  66
  67         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
  68         deve = se_cmd->se_deve =
  69                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
  70         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  71                 if (se_cmd) {
  72                         deve->total_cmds++;
  73                         deve->total_bytes += se_cmd->data_length;
  74
  75                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
  76                                 if (deve->lun_flags &
  77                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
  78                                         read_only = 1;
  79                                         goto out;
  80                                 }
  81                                 deve->write_bytes += se_cmd->data_length;
  82                         } else if (se_cmd->data_direction ==
  83                                    DMA_FROM_DEVICE) {
  84                                 deve->read_bytes += se_cmd->data_length;
  85                         }
  86                 }
  87                 deve->deve_cmds++;
  88
  89                 se_lun = se_cmd->se_lun = deve->se_lun;
  90                 se_cmd->pr_res_key = deve->pr_res_key;
  91                 se_cmd->orig_fe_lun = unpacked_lun;
  92                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
  93                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  94         }
  95 out:
  96         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
  97
  98         if (!se_lun) {
  99                 if (read_only) {
 100                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 101                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 102                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
 103                                 " Access for 0x%08x\n",
 104                                 CMD_TFO(se_cmd)->get_fabric_name(),
 105                                 unpacked_lun);
 106                         return -1;
 107                 } else {
 108                         /*
 109                          * Use the se_portal_group->tpg_virt_lun0 to allow for
 110                          * REPORT_LUNS, et al to be returned when no active
 111                          * MappedLUN=0 exists for this Initiator Port.
 112                          */
 113                         if (unpacked_lun != 0) {
 114                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 115                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 116                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 117                                         " Access for 0x%08x\n",
 118                                         CMD_TFO(se_cmd)->get_fabric_name(),
 119                                         unpacked_lun);
 120                                 return -1;
 121                         }
 122                         /*
 123                          * Force WRITE PROTECT for virtual LUN 0
 124                          */
 125                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 126                             (se_cmd->data_direction != DMA_NONE)) {
 127                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 128                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 129                                 return -1;
 130                         }
 131 #if 0
 132                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
 133                                 CMD_TFO(se_cmd)->get_fabric_name());
 134 #endif
 135                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                         se_cmd->orig_fe_lun = 0;
 137                         se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 138                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 139                 }
 140         }
 141         /*
 142          * Determine if the struct se_lun is online.
 143          */
 144 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 145         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 146                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 147                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 148                 return -1;
 149         }
 150
 151         {
 152         struct se_device *dev = se_lun->lun_se_dev;
 153         spin_lock(&dev->stats_lock);
 154         dev->num_cmds++;
 155         if (se_cmd->data_direction == DMA_TO_DEVICE)
 156                 dev->write_bytes += se_cmd->data_length;
 157         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 158                 dev->read_bytes += se_cmd->data_length;
 159         spin_unlock(&dev->stats_lock);
 160         }
 161
 162         /*
 163          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 164          * for tracking state of struct se_cmds during LUN shutdown events.
 165          */
 166         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 167         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
 168         atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
 169 #if 0
 170         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
 171                 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
 172 #endif
 173         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 174
 175         return 0;
 176 }
 177 EXPORT_SYMBOL(transport_get_lun_for_cmd);
 178
 179 int transport_get_lun_for_tmr(
 180         struct se_cmd *se_cmd,
 181         u32 unpacked_lun)
 182 {
 183         struct se_device *dev = NULL;
 184         struct se_dev_entry *deve;
 185         struct se_lun *se_lun = NULL;
 186         struct se_session *se_sess = SE_SESS(se_cmd);
 187         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 188
 189         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 190         deve = se_cmd->se_deve =
 191                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
 192         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 193                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
 194                 dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
 195                 se_cmd->pr_res_key = deve->pr_res_key;
 196                 se_cmd->orig_fe_lun = unpacked_lun;
 197                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 198 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
 199         }
 200         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 201
 202         if (!se_lun) {
 203                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 204                         " Access for 0x%08x\n",
 205                         CMD_TFO(se_cmd)->get_fabric_name(),
 206                         unpacked_lun);
 207                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 208                 return -1;
 209         }
 210         /*
 211          * Determine if the struct se_lun is online.
 212          */
 213 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 214         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 215                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 216                 return -1;
 217         }
 218
 219         spin_lock(&dev->se_tmr_lock);
 220         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
 221         spin_unlock(&dev->se_tmr_lock);
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(transport_get_lun_for_tmr);
 226
 227 /*
 228  * This function is called from core_scsi3_emulate_pro_register_and_move()
 229  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 230  * when a matching rtpi is found.
 231  */
 232 struct se_dev_entry *core_get_se_deve_from_rtpi(
 233         struct se_node_acl *nacl,
 234         u16 rtpi)
 235 {
 236         struct se_dev_entry *deve;
 237         struct se_lun *lun;
 238         struct se_port *port;
 239         struct se_portal_group *tpg = nacl->se_tpg;
 240         u32 i;
 241
 242         spin_lock_irq(&nacl->device_list_lock);
 243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 244                 deve = &nacl->device_list[i];
 245
 246                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 247                         continue;
 248
 249                 lun = deve->se_lun;
 250                 if (!(lun)) {
 251                         printk(KERN_ERR "%s device entries device pointer is"
 252                                 " NULL, but Initiator has access.\n",
 253                                 TPG_TFO(tpg)->get_fabric_name());
 254                         continue;
 255                 }
 256                 port = lun->lun_sep;
 257                 if (!(port)) {
 258                         printk(KERN_ERR "%s device entries device pointer is"
 259                                 " NULL, but Initiator has access.\n",
 260                                 TPG_TFO(tpg)->get_fabric_name());
 261                         continue;
 262                 }
 263                 if (port->sep_rtpi != rtpi)
 264                         continue;
 265
 266                 atomic_inc(&deve->pr_ref_count);
 267                 smp_mb__after_atomic_inc();
 268                 spin_unlock_irq(&nacl->device_list_lock);
 269
 270                 return deve;
 271         }
 272         spin_unlock_irq(&nacl->device_list_lock);
 273
 274         return NULL;
 275 }
 276
 277 int core_free_device_list_for_node(
 278         struct se_node_acl *nacl,
 279         struct se_portal_group *tpg)
 280 {
 281         struct se_dev_entry *deve;
 282         struct se_lun *lun;
 283         u32 i;
 284
 285         if (!nacl->device_list)
 286                 return 0;
 287
 288         spin_lock_irq(&nacl->device_list_lock);
 289         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 290                 deve = &nacl->device_list[i];
 291
 292                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 293                         continue;
 294
 295                 if (!deve->se_lun) {
 296                         printk(KERN_ERR "%s device entries device pointer is"
 297                                 " NULL, but Initiator has access.\n",
 298                                 TPG_TFO(tpg)->get_fabric_name());
 299                         continue;
 300                 }
 301                 lun = deve->se_lun;
 302
 303                 spin_unlock_irq(&nacl->device_list_lock);
 304                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 305                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 306                 spin_lock_irq(&nacl->device_list_lock);
 307         }
 308         spin_unlock_irq(&nacl->device_list_lock);
 309
 310         kfree(nacl->device_list);
 311         nacl->device_list = NULL;
 312
 313         return 0;
 314 }
 315
 316 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 317 {
 318         struct se_dev_entry *deve;
 319
 320         spin_lock_irq(&se_nacl->device_list_lock);
 321         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 322         deve->deve_cmds--;
 323         spin_unlock_irq(&se_nacl->device_list_lock);
 324
 325         return;
 326 }
 327
 328 void core_update_device_list_access(
 329         u32 mapped_lun,
 330         u32 lun_access,
 331         struct se_node_acl *nacl)
 332 {
 333         struct se_dev_entry *deve;
 334
 335         spin_lock_irq(&nacl->device_list_lock);
 336         deve = &nacl->device_list[mapped_lun];
 337         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 338                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 339                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 340         } else {
 341                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 342                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 343         }
 344         spin_unlock_irq(&nacl->device_list_lock);
 345
 346         return;
 347 }
 348
 349 /*      core_update_device_list_for_node():
 350  *
 351  *
 352  */
 353 int core_update_device_list_for_node(
 354         struct se_lun *lun,
 355         struct se_lun_acl *lun_acl,
 356         u32 mapped_lun,
 357         u32 lun_access,
 358         struct se_node_acl *nacl,
 359         struct se_portal_group *tpg,
 360         int enable)
 361 {
 362         struct se_port *port = lun->lun_sep;
 363         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 364         int trans = 0;
 365         /*
 366          * If the MappedLUN entry is being disabled, the entry in
 367          * port->sep_alua_list must be removed now before clearing the
 368          * struct se_dev_entry pointers below as logic in
 369          * core_alua_do_transition_tg_pt() depends on these being present.
 370          */
 371         if (!(enable)) {
 372                 /*
 373                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 374                  * that have not been explictly concerted to MappedLUNs ->
 375                  * struct se_lun_acl, but we remove deve->alua_port_list from
 376                  * port->sep_alua_list. This also means that active UAs and
 377                  * NodeACL context specific PR metadata for demo-mode
 378                  * MappedLUN *deve will be released below..
 379                  */
 380                 spin_lock_bh(&port->sep_alua_lock);
 381                 list_del(&deve->alua_port_list);
 382                 spin_unlock_bh(&port->sep_alua_lock);
 383         }
 384
 385         spin_lock_irq(&nacl->device_list_lock);
 386         if (enable) {
 387                 /*
 388                  * Check if the call is handling demo mode -> explict LUN ACL
 389                  * transition.  This transition must be for the same struct se_lun
 390                  * + mapped_lun that was setup in demo mode..
 391                  */
 392                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 393                         if (deve->se_lun_acl != NULL) {
 394                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
 395                                         " already set for demo mode -> explict"
 396                                         " LUN ACL transition\n");
 397                                 spin_unlock_irq(&nacl->device_list_lock);
 398                                 return -1;
 399                         }
 400                         if (deve->se_lun != lun) {
 401                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
 402                                         " match passed struct se_lun for demo mode"
 403                                         " -> explict LUN ACL transition\n");
 404                                 spin_unlock_irq(&nacl->device_list_lock);
 405                                 return -1;
 406                         }
 407                         deve->se_lun_acl = lun_acl;
 408                         trans = 1;
 409                 } else {
 410                         deve->se_lun = lun;
 411                         deve->se_lun_acl = lun_acl;
 412                         deve->mapped_lun = mapped_lun;
 413                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 414                 }
 415
 416                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 417                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 418                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 419                 } else {
 420                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 421                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 422                 }
 423
 424                 if (trans) {
 425                         spin_unlock_irq(&nacl->device_list_lock);
 426                         return 0;
 427                 }
 428                 deve->creation_time = get_jiffies_64();
 429                 deve->attach_count++;
 430                 spin_unlock_irq(&nacl->device_list_lock);
 431
 432                 spin_lock_bh(&port->sep_alua_lock);
 433                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 434                 spin_unlock_bh(&port->sep_alua_lock);
 435
 436                 return 0;
 437         }
 438         /*
 439          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 440          * PR operation to complete.
 441          */
 442         spin_unlock_irq(&nacl->device_list_lock);
 443         while (atomic_read(&deve->pr_ref_count) != 0)
 444                 cpu_relax();
 445         spin_lock_irq(&nacl->device_list_lock);
 446         /*
 447          * Disable struct se_dev_entry LUN ACL mapping
 448          */
 449         core_scsi3_ua_release_all(deve);
 450         deve->se_lun = NULL;
 451         deve->se_lun_acl = NULL;
 452         deve->lun_flags = 0;
 453         deve->creation_time = 0;
 454         deve->attach_count--;
 455         spin_unlock_irq(&nacl->device_list_lock);
 456
 457         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 458         return 0;
 459 }
 460
 461 /*      core_clear_lun_from_tpg():
 462  *
 463  *
 464  */
 465 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 466 {
 467         struct se_node_acl *nacl;
 468         struct se_dev_entry *deve;
 469         u32 i;
 470
 471         spin_lock_bh(&tpg->acl_node_lock);
 472         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 473                 spin_unlock_bh(&tpg->acl_node_lock);
 474
 475                 spin_lock_irq(&nacl->device_list_lock);
 476                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 477                         deve = &nacl->device_list[i];
 478                         if (lun != deve->se_lun)
 479                                 continue;
 480                         spin_unlock_irq(&nacl->device_list_lock);
 481
 482                         core_update_device_list_for_node(lun, NULL,
 483                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 484                                 nacl, tpg, 0);
 485
 486                         spin_lock_irq(&nacl->device_list_lock);
 487                 }
 488                 spin_unlock_irq(&nacl->device_list_lock);
 489
 490                 spin_lock_bh(&tpg->acl_node_lock);
 491         }
 492         spin_unlock_bh(&tpg->acl_node_lock);
 493
 494         return;
 495 }
 496
 497 static struct se_port *core_alloc_port(struct se_device *dev)
 498 {
 499         struct se_port *port, *port_tmp;
 500
 501         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 502         if (!(port)) {
 503                 printk(KERN_ERR "Unable to allocate struct se_port\n");
 504                 return NULL;
 505         }
 506         INIT_LIST_HEAD(&port->sep_alua_list);
 507         INIT_LIST_HEAD(&port->sep_list);
 508         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 509         spin_lock_init(&port->sep_alua_lock);
 510         mutex_init(&port->sep_tg_pt_md_mutex);
 511
 512         spin_lock(&dev->se_port_lock);
 513         if (dev->dev_port_count == 0x0000ffff) {
 514                 printk(KERN_WARNING "Reached dev->dev_port_count =="
 515                                 " 0x0000ffff\n");
 516                 spin_unlock(&dev->se_port_lock);
 517                 return NULL;
 518         }
 519 again:
 520         /*
 521          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 522          * Here is the table from spc4r17 section 7.7.3.8.
 523          *
 524          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 525          *
 526          * Code      Description
 527          * 0h        Reserved
 528          * 1h        Relative port 1, historically known as port A
 529          * 2h        Relative port 2, historically known as port B
 530          * 3h to FFFFh    Relative port 3 through 65 535
 531          */
 532         port->sep_rtpi = dev->dev_rpti_counter++;
 533         if (!(port->sep_rtpi))
 534                 goto again;
 535
 536         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 537                 /*
 538                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 539                  * for 16-bit wrap..
 540                  */
 541                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 542                         goto again;
 543         }
 544         spin_unlock(&dev->se_port_lock);
 545
 546         return port;
 547 }
 548
 549 static void core_export_port(
 550         struct se_device *dev,
 551         struct se_portal_group *tpg,
 552         struct se_port *port,
 553         struct se_lun *lun)
 554 {
 555         struct se_subsystem_dev *su_dev = SU_DEV(dev);
 556         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 557
 558         spin_lock(&dev->se_port_lock);
 559         spin_lock(&lun->lun_sep_lock);
 560         port->sep_tpg = tpg;
 561         port->sep_lun = lun;
 562         lun->lun_sep = port;
 563         spin_unlock(&lun->lun_sep_lock);
 564
 565         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 566         spin_unlock(&dev->se_port_lock);
 567
 568         if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
 569                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 570                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 571                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
 572                                         "_gp_member_t\n");
 573                         return;
 574                 }
 575                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 576                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 577                         T10_ALUA(su_dev)->default_tg_pt_gp);
 578                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 579                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
 580                         " Group: alua/default_tg_pt_gp\n",
 581                         TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
 582         }
 583
 584         dev->dev_port_count++;
 585         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 586 }
 587
 588 /*
 589  *      Called with struct se_device->se_port_lock spinlock held.
 590  */
 591 static void core_release_port(struct se_device *dev, struct se_port *port)
 592 {
 593         /*
 594          * Wait for any port reference for PR ALL_TG_PT=1 operation
 595          * to complete in __core_scsi3_alloc_registration()
 596          */
 597         spin_unlock(&dev->se_port_lock);
 598         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 599                 cpu_relax();
 600         spin_lock(&dev->se_port_lock);
 601
 602         core_alua_free_tg_pt_gp_mem(port);
 603
 604         list_del(&port->sep_list);
 605         dev->dev_port_count--;
 606         kfree(port);
 607
 608         return;
 609 }
 610
 611 int core_dev_export(
 612         struct se_device *dev,
 613         struct se_portal_group *tpg,
 614         struct se_lun *lun)
 615 {
 616         struct se_port *port;
 617
 618         port = core_alloc_port(dev);
 619         if (!(port))
 620                 return -1;
 621
 622         lun->lun_se_dev = dev;
 623         se_dev_start(dev);
 624
 625         atomic_inc(&dev->dev_export_obj.obj_access_count);
 626         core_export_port(dev, tpg, port, lun);
 627         return 0;
 628 }
 629
 630 void core_dev_unexport(
 631         struct se_device *dev,
 632         struct se_portal_group *tpg,
 633         struct se_lun *lun)
 634 {
 635         struct se_port *port = lun->lun_sep;
 636
 637         spin_lock(&lun->lun_sep_lock);
 638         if (lun->lun_se_dev == NULL) {
 639                 spin_unlock(&lun->lun_sep_lock);
 640                 return;
 641         }
 642         spin_unlock(&lun->lun_sep_lock);
 643
 644         spin_lock(&dev->se_port_lock);
 645         atomic_dec(&dev->dev_export_obj.obj_access_count);
 646         core_release_port(dev, port);
 647         spin_unlock(&dev->se_port_lock);
 648
 649         se_dev_stop(dev);
 650         lun->lun_se_dev = NULL;
 651 }
 652
 653 int transport_core_report_lun_response(struct se_cmd *se_cmd)
 654 {
 655         struct se_dev_entry *deve;
 656         struct se_lun *se_lun;
 657         struct se_session *se_sess = SE_SESS(se_cmd);
 658         struct se_task *se_task;
 659         unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
 660         u32 cdb_offset = 0, lun_count = 0, offset = 8;
 661         u64 i, lun;
 662
 663         list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
 664                 break;
 665
 666         if (!(se_task)) {
 667                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
 668                 return PYX_TRANSPORT_LU_COMM_FAILURE;
 669         }
 670
 671         /*
 672          * If no struct se_session pointer is present, this struct se_cmd is
 673          * coming via a target_core_mod PASSTHROUGH op, and not through
 674          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 675          */
 676         if (!(se_sess)) {
 677                 lun = 0;
 678                 buf[offset++] = ((lun >> 56) & 0xff);
 679                 buf[offset++] = ((lun >> 48) & 0xff);
 680                 buf[offset++] = ((lun >> 40) & 0xff);
 681                 buf[offset++] = ((lun >> 32) & 0xff);
 682                 buf[offset++] = ((lun >> 24) & 0xff);
 683                 buf[offset++] = ((lun >> 16) & 0xff);
 684                 buf[offset++] = ((lun >> 8) & 0xff);
 685                 buf[offset++] = (lun & 0xff);
 686                 lun_count = 1;
 687                 goto done;
 688         }
 689
 690         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 691         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 692                 deve = &SE_NODE_ACL(se_sess)->device_list[i];
 693                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 694                         continue;
 695                 se_lun = deve->se_lun;
 696                 /*
 697                  * We determine the correct LUN LIST LENGTH even once we
 698                  * have reached the initial allocation length.
 699                  * See SPC2-R20 7.19.
 700                  */
 701                 lun_count++;
 702                 if ((cdb_offset + 8) >= se_cmd->data_length)
 703                         continue;
 704
 705                 lun = cpu_to_be64(CMD_TFO(se_cmd)->pack_lun(deve->mapped_lun));
 706                 buf[offset++] = ((lun >> 56) & 0xff);
 707                 buf[offset++] = ((lun >> 48) & 0xff);
 708                 buf[offset++] = ((lun >> 40) & 0xff);
 709                 buf[offset++] = ((lun >> 32) & 0xff);
 710                 buf[offset++] = ((lun >> 24) & 0xff);
 711                 buf[offset++] = ((lun >> 16) & 0xff);
 712                 buf[offset++] = ((lun >> 8) & 0xff);
 713                 buf[offset++] = (lun & 0xff);
 714                 cdb_offset += 8;
 715         }
 716         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 717
 718         /*
 719          * See SPC3 r07, page 159.
 720          */
 721 done:
 722         lun_count *= 8;
 723         buf[0] = ((lun_count >> 24) & 0xff);
 724         buf[1] = ((lun_count >> 16) & 0xff);
 725         buf[2] = ((lun_count >> 8) & 0xff);
 726         buf[3] = (lun_count & 0xff);
 727
 728         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 729 }
 730
 731 /*      se_release_device_for_hba():
 732  *
 733  *
 734  */
 735 void se_release_device_for_hba(struct se_device *dev)
 736 {
 737         struct se_hba *hba = dev->se_hba;
 738
 739         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 740             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 741             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 742             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 743             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 744                 se_dev_stop(dev);
 745
 746         if (dev->dev_ptr) {
 747                 kthread_stop(dev->process_thread);
 748                 if (dev->transport->free_device)
 749                         dev->transport->free_device(dev->dev_ptr);
 750         }
 751
 752         spin_lock(&hba->device_lock);
 753         list_del(&dev->dev_list);
 754         hba->dev_count--;
 755         spin_unlock(&hba->device_lock);
 756
 757         core_scsi3_free_all_registrations(dev);
 758         se_release_vpd_for_dev(dev);
 759
 760         kfree(dev->dev_status_queue_obj);
 761         kfree(dev->dev_queue_obj);
 762         kfree(dev);
 763
 764         return;
 765 }
 766
 767 void se_release_vpd_for_dev(struct se_device *dev)
 768 {
 769         struct t10_vpd *vpd, *vpd_tmp;
 770
 771         spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 772         list_for_each_entry_safe(vpd, vpd_tmp,
 773                         &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
 774                 list_del(&vpd->vpd_list);
 775                 kfree(vpd);
 776         }
 777         spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 778
 779         return;
 780 }
 781
 782 /*
 783  * Called with struct se_hba->device_lock held.
 784  */
 785 void se_clear_dev_ports(struct se_device *dev)
 786 {
 787         struct se_hba *hba = dev->se_hba;
 788         struct se_lun *lun;
 789         struct se_portal_group *tpg;
 790         struct se_port *sep, *sep_tmp;
 791
 792         spin_lock(&dev->se_port_lock);
 793         list_for_each_entry_safe(sep, sep_tmp, &dev->dev_sep_list, sep_list) {
 794                 spin_unlock(&dev->se_port_lock);
 795                 spin_unlock(&hba->device_lock);
 796
 797                 lun = sep->sep_lun;
 798                 tpg = sep->sep_tpg;
 799                 spin_lock(&lun->lun_sep_lock);
 800                 if (lun->lun_se_dev == NULL) {
 801                         spin_unlock(&lun->lun_sep_lock);
 802                         continue;
 803                 }
 804                 spin_unlock(&lun->lun_sep_lock);
 805
 806                 core_dev_del_lun(tpg, lun->unpacked_lun);
 807
 808                 spin_lock(&hba->device_lock);
 809                 spin_lock(&dev->se_port_lock);
 810         }
 811         spin_unlock(&dev->se_port_lock);
 812
 813         return;
 814 }
 815
 816 /*      se_free_virtual_device():
 817  *
 818  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 819  */
 820 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 821 {
 822         spin_lock(&hba->device_lock);
 823         se_clear_dev_ports(dev);
 824         spin_unlock(&hba->device_lock);
 825
 826         core_alua_free_lu_gp_mem(dev);
 827         se_release_device_for_hba(dev);
 828
 829         return 0;
 830 }
 831
 832 static void se_dev_start(struct se_device *dev)
 833 {
 834         struct se_hba *hba = dev->se_hba;
 835
 836         spin_lock(&hba->device_lock);
 837         atomic_inc(&dev->dev_obj.obj_access_count);
 838         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 839                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 840                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 841                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 842                 } else if (dev->dev_status &
 843                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 844                         dev->dev_status &=
 845                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 846                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 847                 }
 848         }
 849         spin_unlock(&hba->device_lock);
 850 }
 851
 852 static void se_dev_stop(struct se_device *dev)
 853 {
 854         struct se_hba *hba = dev->se_hba;
 855
 856         spin_lock(&hba->device_lock);
 857         atomic_dec(&dev->dev_obj.obj_access_count);
 858         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 859                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 860                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 861                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 862                 } else if (dev->dev_status &
 863                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 864                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 865                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 866                 }
 867         }
 868         spin_unlock(&hba->device_lock);
 869 }
 870
 871 int se_dev_check_online(struct se_device *dev)
 872 {
 873         int ret;
 874
 875         spin_lock_irq(&dev->dev_status_lock);
 876         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 877                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 878         spin_unlock_irq(&dev->dev_status_lock);
 879
 880         return ret;
 881 }
 882
 883 int se_dev_check_shutdown(struct se_device *dev)
 884 {
 885         int ret;
 886
 887         spin_lock_irq(&dev->dev_status_lock);
 888         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 889         spin_unlock_irq(&dev->dev_status_lock);
 890
 891         return ret;
 892 }
 893
 894 void se_dev_set_default_attribs(
 895         struct se_device *dev,
 896         struct se_dev_limits *dev_limits)
 897 {
 898         struct queue_limits *limits = &dev_limits->limits;
 899
 900         DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
 901         DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
 902         DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
 903         DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 904         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 905         DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
 906         DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
 907         DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
 908         DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
 909         DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
 910         DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 911         /*
 912          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 913          * iblock_create_virtdevice() from struct queue_limits values
 914          * if blk_queue_discard()==1
 915          */
 916         DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 917         DEV_ATTRIB(dev)->max_unmap_block_desc_count =
 918                                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 919         DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 920         DEV_ATTRIB(dev)->unmap_granularity_alignment =
 921                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 922         /*
 923          * block_size is based on subsystem plugin dependent requirements.
 924          */
 925         DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
 926         DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
 927         /*
 928          * max_sectors is based on subsystem plugin dependent requirements.
 929          */
 930         DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
 931         DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
 932         /*
 933          * Set optimal_sectors from max_sectors, which can be lowered via
 934          * configfs.
 935          */
 936         DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
 937         /*
 938          * queue_depth is based on subsystem plugin dependent requirements.
 939          */
 940         DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
 941         DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
 942 }
 943
 944 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
 945 {
 946         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
 947                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
 948                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
 949                 return -1;
 950         } else {
 951                 DEV_ATTRIB(dev)->task_timeout = task_timeout;
 952                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
 953                         dev, task_timeout);
 954         }
 955
 956         return 0;
 957 }
 958
 959 int se_dev_set_max_unmap_lba_count(
 960         struct se_device *dev,
 961         u32 max_unmap_lba_count)
 962 {
 963         DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
 964         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
 965                         dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
 966         return 0;
 967 }
 968
 969 int se_dev_set_max_unmap_block_desc_count(
 970         struct se_device *dev,
 971         u32 max_unmap_block_desc_count)
 972 {
 973         DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
 974         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
 975                         dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
 976         return 0;
 977 }
 978
 979 int se_dev_set_unmap_granularity(
 980         struct se_device *dev,
 981         u32 unmap_granularity)
 982 {
 983         DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
 984         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
 985                         dev, DEV_ATTRIB(dev)->unmap_granularity);
 986         return 0;
 987 }
 988
 989 int se_dev_set_unmap_granularity_alignment(
 990         struct se_device *dev,
 991         u32 unmap_granularity_alignment)
 992 {
 993         DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
 994         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
 995                         dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
 996         return 0;
 997 }
 998
 999 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
1000 {
1001         if ((flag != 0) && (flag != 1)) {
1002                 printk(KERN_ERR "Illegal value %d\n", flag);
1003                 return -1;
1004         }
1005         if (TRANSPORT(dev)->dpo_emulated == NULL) {
1006                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
1007                 return -1;
1008         }
1009         if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
1010                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
1011                 return -1;
1012         }
1013         DEV_ATTRIB(dev)->emulate_dpo = flag;
1014         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
1015                         " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
1016         return 0;
1017 }
1018
1019 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
1020 {
1021         if ((flag != 0) && (flag != 1)) {
1022                 printk(KERN_ERR "Illegal value %d\n", flag);
1023                 return -1;
1024         }
1025         if (TRANSPORT(dev)->fua_write_emulated == NULL) {
1026                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
1027                 return -1;
1028         }
1029         if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
1030                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
1031                 return -1;
1032         }
1033         DEV_ATTRIB(dev)->emulate_fua_write = flag;
1034         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
1035                         dev, DEV_ATTRIB(dev)->emulate_fua_write);
1036         return 0;
1037 }
1038
1039 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1040 {
1041         if ((flag != 0) && (flag != 1)) {
1042                 printk(KERN_ERR "Illegal value %d\n", flag);
1043                 return -1;
1044         }
1045         if (TRANSPORT(dev)->fua_read_emulated == NULL) {
1046                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
1047                 return -1;
1048         }
1049         if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1050                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1051                 return -1;
1052         }
1053         DEV_ATTRIB(dev)->emulate_fua_read = flag;
1054         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1055                         dev, DEV_ATTRIB(dev)->emulate_fua_read);
1056         return 0;
1057 }
1058
1059 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1060 {
1061         if ((flag != 0) && (flag != 1)) {
1062                 printk(KERN_ERR "Illegal value %d\n", flag);
1063                 return -1;
1064         }
1065         if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1066                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1067                 return -1;
1068         }
1069         if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1070                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1071                 return -1;
1072         }
1073         DEV_ATTRIB(dev)->emulate_write_cache = flag;
1074         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1075                         dev, DEV_ATTRIB(dev)->emulate_write_cache);
1076         return 0;
1077 }
1078
1079 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1080 {
1081         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1082                 printk(KERN_ERR "Illegal value %d\n", flag);
1083                 return -1;
1084         }
1085
1086         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1087                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1088                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1089                         " exists\n", dev,
1090                         atomic_read(&dev->dev_export_obj.obj_access_count));
1091                 return -1;
1092         }
1093         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1094         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1095                 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1096
1097         return 0;
1098 }
1099
1100 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1101 {
1102         if ((flag != 0) && (flag != 1)) {
1103                 printk(KERN_ERR "Illegal value %d\n", flag);
1104                 return -1;
1105         }
1106
1107         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1108                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1109                         " dev_export_obj: %d count exists\n", dev,
1110                         atomic_read(&dev->dev_export_obj.obj_access_count));
1111                 return -1;
1112         }
1113         DEV_ATTRIB(dev)->emulate_tas = flag;
1114         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1115                 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1116
1117         return 0;
1118 }
1119
1120 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1121 {
1122         if ((flag != 0) && (flag != 1)) {
1123                 printk(KERN_ERR "Illegal value %d\n", flag);
1124                 return -1;
1125         }
1126         /*
1127          * We expect this value to be non-zero when generic Block Layer
1128          * Discard supported is detected iblock_create_virtdevice().
1129          */
1130         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1131                 printk(KERN_ERR "Generic Block Discard not supported\n");
1132                 return -ENOSYS;
1133         }
1134
1135         DEV_ATTRIB(dev)->emulate_tpu = flag;
1136         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1137                                 dev, flag);
1138         return 0;
1139 }
1140
1141 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1142 {
1143         if ((flag != 0) && (flag != 1)) {
1144                 printk(KERN_ERR "Illegal value %d\n", flag);
1145                 return -1;
1146         }
1147         /*
1148          * We expect this value to be non-zero when generic Block Layer
1149          * Discard supported is detected iblock_create_virtdevice().
1150          */
1151         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1152                 printk(KERN_ERR "Generic Block Discard not supported\n");
1153                 return -ENOSYS;
1154         }
1155
1156         DEV_ATTRIB(dev)->emulate_tpws = flag;
1157         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1158                                 dev, flag);
1159         return 0;
1160 }
1161
1162 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1163 {
1164         if ((flag != 0) && (flag != 1)) {
1165                 printk(KERN_ERR "Illegal value %d\n", flag);
1166                 return -1;
1167         }
1168         DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1169         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1170                 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1171         return 0;
1172 }
1173
1174 /*
1175  * Note, this can only be called on unexported SE Device Object.
1176  */
1177 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1178 {
1179         u32 orig_queue_depth = dev->queue_depth;
1180
1181         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1182                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1183                         " dev_export_obj: %d count exists\n", dev,
1184                         atomic_read(&dev->dev_export_obj.obj_access_count));
1185                 return -1;
1186         }
1187         if (!(queue_depth)) {
1188                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1189                         "_depth\n", dev);
1190                 return -1;
1191         }
1192
1193         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1194                 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1195                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1196                                 " exceeds TCM/SE_Device TCQ: %u\n",
1197                                 dev, queue_depth,
1198                                 DEV_ATTRIB(dev)->hw_queue_depth);
1199                         return -1;
1200                 }
1201         } else {
1202                 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1203                         if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1204                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1205                                         " %u exceeds TCM/SE_Device MAX"
1206                                         " TCQ: %u\n", dev, queue_depth,
1207                                         DEV_ATTRIB(dev)->hw_queue_depth);
1208                                 return -1;
1209                         }
1210                 }
1211         }
1212
1213         DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1214         if (queue_depth > orig_queue_depth)
1215                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1216         else if (queue_depth < orig_queue_depth)
1217                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1218
1219         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1220                         dev, queue_depth);
1221         return 0;
1222 }
1223
1224 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1225 {
1226         int force = 0; /* Force setting for VDEVS */
1227
1228         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1229                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1230                         " max_sectors while dev_export_obj: %d count exists\n",
1231                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1232                 return -1;
1233         }
1234         if (!(max_sectors)) {
1235                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1236                         " max_sectors\n", dev);
1237                 return -1;
1238         }
1239         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1240                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1241                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1242                                 DA_STATUS_MAX_SECTORS_MIN);
1243                 return -1;
1244         }
1245         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1246                 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1247                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1248                                 " greater than TCM/SE_Device max_sectors:"
1249                                 " %u\n", dev, max_sectors,
1250                                 DEV_ATTRIB(dev)->hw_max_sectors);
1251                          return -1;
1252                 }
1253         } else {
1254                 if (!(force) && (max_sectors >
1255                                  DEV_ATTRIB(dev)->hw_max_sectors)) {
1256                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1257                                 " greater than TCM/SE_Device max_sectors"
1258                                 ": %u, use force=1 to override.\n", dev,
1259                                 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1260                         return -1;
1261                 }
1262                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1263                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1264                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1265                                 " %u\n", dev, max_sectors,
1266                                 DA_STATUS_MAX_SECTORS_MAX);
1267                         return -1;
1268                 }
1269         }
1270
1271         DEV_ATTRIB(dev)->max_sectors = max_sectors;
1272         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1273                         dev, max_sectors);
1274         return 0;
1275 }
1276
1277 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1278 {
1279         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1280                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1281                         " optimal_sectors while dev_export_obj: %d count exists\n",
1282                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1283                 return -EINVAL;
1284         }
1285         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1286                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1287                                 " changed for TCM/pSCSI\n", dev);
1288                 return -EINVAL;
1289         }
1290         if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1291                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1292                         " greater than max_sectors: %u\n", dev,
1293                         optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1294                 return -EINVAL;
1295         }
1296
1297         DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1298         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1299                         dev, optimal_sectors);
1300         return 0;
1301 }
1302
1303 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1304 {
1305         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1306                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1307                         " while dev_export_obj: %d count exists\n", dev,
1308                         atomic_read(&dev->dev_export_obj.obj_access_count));
1309                 return -1;
1310         }
1311
1312         if ((block_size != 512) &&
1313             (block_size != 1024) &&
1314             (block_size != 2048) &&
1315             (block_size != 4096)) {
1316                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1317                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1318                         dev, block_size);
1319                 return -1;
1320         }
1321
1322         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1323                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1324                         " Physical Device, use for Linux/SCSI to change"
1325                         " block_size for underlying hardware\n", dev);
1326                 return -1;
1327         }
1328
1329         DEV_ATTRIB(dev)->block_size = block_size;
1330         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1331                         dev, block_size);
1332         return 0;
1333 }
1334
1335 struct se_lun *core_dev_add_lun(
1336         struct se_portal_group *tpg,
1337         struct se_hba *hba,
1338         struct se_device *dev,
1339         u32 lun)
1340 {
1341         struct se_lun *lun_p;
1342         u32 lun_access = 0;
1343
1344         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1345                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1346                         atomic_read(&dev->dev_access_obj.obj_access_count));
1347                 return NULL;
1348         }
1349
1350         lun_p = core_tpg_pre_addlun(tpg, lun);
1351         if ((IS_ERR(lun_p)) || !(lun_p))
1352                 return NULL;
1353
1354         if (dev->dev_flags & DF_READ_ONLY)
1355                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1356         else
1357                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1358
1359         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1360                 return NULL;
1361
1362         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1363                 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1364                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1365                 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1366         /*
1367          * Update LUN maps for dynamically added initiators when
1368          * generate_node_acl is enabled.
1369          */
1370         if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1371                 struct se_node_acl *acl;
1372                 spin_lock_bh(&tpg->acl_node_lock);
1373                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1374                         if (acl->dynamic_node_acl) {
1375                                 spin_unlock_bh(&tpg->acl_node_lock);
1376                                 core_tpg_add_node_to_devs(acl, tpg);
1377                                 spin_lock_bh(&tpg->acl_node_lock);
1378                         }
1379                 }
1380                 spin_unlock_bh(&tpg->acl_node_lock);
1381         }
1382
1383         return lun_p;
1384 }
1385
1386 /*      core_dev_del_lun():
1387  *
1388  *
1389  */
1390 int core_dev_del_lun(
1391         struct se_portal_group *tpg,
1392         u32 unpacked_lun)
1393 {
1394         struct se_lun *lun;
1395         int ret = 0;
1396
1397         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1398         if (!(lun))
1399                 return ret;
1400
1401         core_tpg_post_dellun(tpg, lun);
1402
1403         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1404                 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1405                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1406                 TPG_TFO(tpg)->get_fabric_name());
1407
1408         return 0;
1409 }
1410
1411 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1412 {
1413         struct se_lun *lun;
1414
1415         spin_lock(&tpg->tpg_lun_lock);
1416         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1417                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1418                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1419                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1420                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1421                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1422                 spin_unlock(&tpg->tpg_lun_lock);
1423                 return NULL;
1424         }
1425         lun = &tpg->tpg_lun_list[unpacked_lun];
1426
1427         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1428                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1429                         " Target Portal Group: %hu, ignoring request.\n",
1430                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1431                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1432                 spin_unlock(&tpg->tpg_lun_lock);
1433                 return NULL;
1434         }
1435         spin_unlock(&tpg->tpg_lun_lock);
1436
1437         return lun;
1438 }
1439
1440 /*      core_dev_get_lun():
1441  *
1442  *
1443  */
1444 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1445 {
1446         struct se_lun *lun;
1447
1448         spin_lock(&tpg->tpg_lun_lock);
1449         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1450                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1451                         "_TPG-1: %u for Target Portal Group: %hu\n",
1452                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1453                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1454                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1455                 spin_unlock(&tpg->tpg_lun_lock);
1456                 return NULL;
1457         }
1458         lun = &tpg->tpg_lun_list[unpacked_lun];
1459
1460         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1461                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1462                         " Target Portal Group: %hu, ignoring request.\n",
1463                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1464                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1465                 spin_unlock(&tpg->tpg_lun_lock);
1466                 return NULL;
1467         }
1468         spin_unlock(&tpg->tpg_lun_lock);
1469
1470         return lun;
1471 }
1472
1473 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1474         struct se_portal_group *tpg,
1475         u32 mapped_lun,
1476         char *initiatorname,
1477         int *ret)
1478 {
1479         struct se_lun_acl *lacl;
1480         struct se_node_acl *nacl;
1481
1482         if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1483                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1484                         TPG_TFO(tpg)->get_fabric_name());
1485                 *ret = -EOVERFLOW;
1486                 return NULL;
1487         }
1488         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1489         if (!(nacl)) {
1490                 *ret = -EINVAL;
1491                 return NULL;
1492         }
1493         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1494         if (!(lacl)) {
1495                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1496                 *ret = -ENOMEM;
1497                 return NULL;
1498         }
1499
1500         INIT_LIST_HEAD(&lacl->lacl_list);
1501         lacl->mapped_lun = mapped_lun;
1502         lacl->se_lun_nacl = nacl;
1503         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1504
1505         return lacl;
1506 }
1507
1508 int core_dev_add_initiator_node_lun_acl(
1509         struct se_portal_group *tpg,
1510         struct se_lun_acl *lacl,
1511         u32 unpacked_lun,
1512         u32 lun_access)
1513 {
1514         struct se_lun *lun;
1515         struct se_node_acl *nacl;
1516
1517         lun = core_dev_get_lun(tpg, unpacked_lun);
1518         if (!(lun)) {
1519                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1520                         " Target Portal Group: %hu, ignoring request.\n",
1521                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1522                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1523                 return -EINVAL;
1524         }
1525
1526         nacl = lacl->se_lun_nacl;
1527         if (!(nacl))
1528                 return -EINVAL;
1529
1530         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1531             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1532                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1533
1534         lacl->se_lun = lun;
1535
1536         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1537                         lun_access, nacl, tpg, 1) < 0)
1538                 return -EINVAL;
1539
1540         spin_lock(&lun->lun_acl_lock);
1541         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1542         atomic_inc(&lun->lun_acl_count);
1543         smp_mb__after_atomic_inc();
1544         spin_unlock(&lun->lun_acl_lock);
1545
1546         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1547                 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1548                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1549                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1550                 lacl->initiatorname);
1551         /*
1552          * Check to see if there are any existing persistent reservation APTPL
1553          * pre-registrations that need to be enabled for this LUN ACL..
1554          */
1555         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1556         return 0;
1557 }
1558
1559 /*      core_dev_del_initiator_node_lun_acl():
1560  *
1561  *
1562  */
1563 int core_dev_del_initiator_node_lun_acl(
1564         struct se_portal_group *tpg,
1565         struct se_lun *lun,
1566         struct se_lun_acl *lacl)
1567 {
1568         struct se_node_acl *nacl;
1569
1570         nacl = lacl->se_lun_nacl;
1571         if (!(nacl))
1572                 return -EINVAL;
1573
1574         spin_lock(&lun->lun_acl_lock);
1575         list_del(&lacl->lacl_list);
1576         atomic_dec(&lun->lun_acl_count);
1577         smp_mb__after_atomic_dec();
1578         spin_unlock(&lun->lun_acl_lock);
1579
1580         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1581                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1582
1583         lacl->se_lun = NULL;
1584
1585         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1586                 " InitiatorNode: %s Mapped LUN: %u\n",
1587                 TPG_TFO(tpg)->get_fabric_name(),
1588                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1589                 lacl->initiatorname, lacl->mapped_lun);
1590
1591         return 0;
1592 }
1593
1594 void core_dev_free_initiator_node_lun_acl(
1595         struct se_portal_group *tpg,
1596         struct se_lun_acl *lacl)
1597 {
1598         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1599                 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1600                 TPG_TFO(tpg)->tpg_get_tag(tpg),
1601                 TPG_TFO(tpg)->get_fabric_name(),
1602                 lacl->initiatorname, lacl->mapped_lun);
1603
1604         kfree(lacl);
1605 }
1606
1607 int core_dev_setup_virtual_lun0(void)
1608 {
1609         struct se_hba *hba;
1610         struct se_device *dev;
1611         struct se_subsystem_dev *se_dev = NULL;
1612         struct se_subsystem_api *t;
1613         char buf[16];
1614         int ret;
1615
1616         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1617         if (IS_ERR(hba))
1618                 return PTR_ERR(hba);
1619
1620         se_global->g_lun0_hba = hba;
1621         t = hba->transport;
1622
1623         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1624         if (!(se_dev)) {
1625                 printk(KERN_ERR "Unable to allocate memory for"
1626                                 " struct se_subsystem_dev\n");
1627                 ret = -ENOMEM;
1628                 goto out;
1629         }
1630         INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1631         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1632         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1633         INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1634         INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1635         spin_lock_init(&se_dev->t10_reservation.registration_lock);
1636         spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1637         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1638         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1639         spin_lock_init(&se_dev->se_dev_lock);
1640         se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1641         se_dev->t10_wwn.t10_sub_dev = se_dev;
1642         se_dev->t10_alua.t10_sub_dev = se_dev;
1643         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1644         se_dev->se_dev_hba = hba;
1645
1646         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1647         if (!(se_dev->se_dev_su_ptr)) {
1648                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1649                         " from allocate_virtdevice()\n");
1650                 ret = -ENOMEM;
1651                 goto out;
1652         }
1653         se_global->g_lun0_su_dev = se_dev;
1654
1655         memset(buf, 0, 16);
1656         sprintf(buf, "rd_pages=8");
1657         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1658
1659         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1660         if (!(dev) || IS_ERR(dev)) {
1661                 ret = -ENOMEM;
1662                 goto out;
1663         }
1664         se_dev->se_dev_ptr = dev;
1665         se_global->g_lun0_dev = dev;
1666
1667         return 0;
1668 out:
1669         se_global->g_lun0_su_dev = NULL;
1670         kfree(se_dev);
1671         if (se_global->g_lun0_hba) {
1672                 core_delete_hba(se_global->g_lun0_hba);
1673                 se_global->g_lun0_hba = NULL;
1674         }
1675         return ret;
1676 }
1677
1678
1679 void core_dev_release_virtual_lun0(void)
1680 {
1681         struct se_hba *hba = se_global->g_lun0_hba;
1682         struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1683
1684         if (!(hba))
1685                 return;
1686
1687         if (se_global->g_lun0_dev)
1688                 se_free_virtual_device(se_global->g_lun0_dev, hba);
1689
1690         kfree(su_dev);
1691         core_delete_hba(hba);
1692 }