drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <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 static struct se_hba *lun0_hba;
  58 static struct se_subsystem_dev *lun0_su_dev;
  59 /* not static, needed by tpg.c */
  60 struct se_device *g_lun0_dev;
  61
  62 int transport_get_lun_for_cmd(
  63         struct se_cmd *se_cmd,
  64         u32 unpacked_lun)
  65 {
  66         struct se_dev_entry *deve;
  67         struct se_lun *se_lun = NULL;
  68         struct se_session *se_sess = se_cmd->se_sess;
  69         unsigned long flags;
  70         int read_only = 0;
  71
  72         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  73                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  74                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  75                 return -ENODEV;
  76         }
  77
  78         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
  79         deve = se_cmd->se_deve =
  80                         &se_sess->se_node_acl->device_list[unpacked_lun];
  81         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  82                 if (se_cmd) {
  83                         deve->total_cmds++;
  84                         deve->total_bytes += se_cmd->data_length;
  85
  86                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
  87                                 if (deve->lun_flags &
  88                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
  89                                         read_only = 1;
  90                                         goto out;
  91                                 }
  92                                 deve->write_bytes += se_cmd->data_length;
  93                         } else if (se_cmd->data_direction ==
  94                                    DMA_FROM_DEVICE) {
  95                                 deve->read_bytes += se_cmd->data_length;
  96                         }
  97                 }
  98                 deve->deve_cmds++;
  99
 100                 se_lun = se_cmd->se_lun = deve->se_lun;
 101                 se_cmd->pr_res_key = deve->pr_res_key;
 102                 se_cmd->orig_fe_lun = unpacked_lun;
 103                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
 104                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 105         }
 106 out:
 107         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 108
 109         if (!se_lun) {
 110                 if (read_only) {
 111                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 112                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 113                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
 114                                 " Access for 0x%08x\n",
 115                                 se_cmd->se_tfo->get_fabric_name(),
 116                                 unpacked_lun);
 117                         return -EACCES;
 118                 } else {
 119                         /*
 120                          * Use the se_portal_group->tpg_virt_lun0 to allow for
 121                          * REPORT_LUNS, et al to be returned when no active
 122                          * MappedLUN=0 exists for this Initiator Port.
 123                          */
 124                         if (unpacked_lun != 0) {
 125                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 126                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 127                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 128                                         " Access for 0x%08x\n",
 129                                         se_cmd->se_tfo->get_fabric_name(),
 130                                         unpacked_lun);
 131                                 return -ENODEV;
 132                         }
 133                         /*
 134                          * Force WRITE PROTECT for virtual LUN 0
 135                          */
 136                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 137                             (se_cmd->data_direction != DMA_NONE)) {
 138                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 139                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 140                                 return -EACCES;
 141                         }
 142 #if 0
 143                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
 144                                 se_cmd->se_tfo->get_fabric_name());
 145 #endif
 146                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 147                         se_cmd->orig_fe_lun = 0;
 148                         se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
 149                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 150                 }
 151         }
 152         /*
 153          * Determine if the struct se_lun is online.
 154          */
 155 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 156         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 157                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 158                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 159                 return -ENODEV;
 160         }
 161
 162         {
 163         struct se_device *dev = se_lun->lun_se_dev;
 164         spin_lock_irq(&dev->stats_lock);
 165         dev->num_cmds++;
 166         if (se_cmd->data_direction == DMA_TO_DEVICE)
 167                 dev->write_bytes += se_cmd->data_length;
 168         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 169                 dev->read_bytes += se_cmd->data_length;
 170         spin_unlock_irq(&dev->stats_lock);
 171         }
 172
 173         /*
 174          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 175          * for tracking state of struct se_cmds during LUN shutdown events.
 176          */
 177         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 178         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
 179         atomic_set(&se_cmd->t_task->transport_lun_active, 1);
 180 #if 0
 181         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
 182                 se_cmd->se_tfo->get_task_tag(se_cmd), se_lun->unpacked_lun);
 183 #endif
 184         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 185
 186         return 0;
 187 }
 188 EXPORT_SYMBOL(transport_get_lun_for_cmd);
 189
 190 int transport_get_lun_for_tmr(
 191         struct se_cmd *se_cmd,
 192         u32 unpacked_lun)
 193 {
 194         struct se_device *dev = NULL;
 195         struct se_dev_entry *deve;
 196         struct se_lun *se_lun = NULL;
 197         struct se_session *se_sess = se_cmd->se_sess;
 198         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 199
 200         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 201                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 203                 return -ENODEV;
 204         }
 205
 206         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 207         deve = se_cmd->se_deve =
 208                         &se_sess->se_node_acl->device_list[unpacked_lun];
 209         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 210                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
 211                 dev = se_lun->lun_se_dev;
 212                 se_cmd->pr_res_key = deve->pr_res_key;
 213                 se_cmd->orig_fe_lun = unpacked_lun;
 214                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
 215 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
 216         }
 217         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 218
 219         if (!se_lun) {
 220                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 221                         " Access for 0x%08x\n",
 222                         se_cmd->se_tfo->get_fabric_name(),
 223                         unpacked_lun);
 224                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 225                 return -ENODEV;
 226         }
 227         /*
 228          * Determine if the struct se_lun is online.
 229          */
 230 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 231         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 232                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 233                 return -ENODEV;
 234         }
 235         se_tmr->tmr_dev = dev;
 236
 237         spin_lock(&dev->se_tmr_lock);
 238         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
 239         spin_unlock(&dev->se_tmr_lock);
 240
 241         return 0;
 242 }
 243 EXPORT_SYMBOL(transport_get_lun_for_tmr);
 244
 245 /*
 246  * This function is called from core_scsi3_emulate_pro_register_and_move()
 247  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 248  * when a matching rtpi is found.
 249  */
 250 struct se_dev_entry *core_get_se_deve_from_rtpi(
 251         struct se_node_acl *nacl,
 252         u16 rtpi)
 253 {
 254         struct se_dev_entry *deve;
 255         struct se_lun *lun;
 256         struct se_port *port;
 257         struct se_portal_group *tpg = nacl->se_tpg;
 258         u32 i;
 259
 260         spin_lock_irq(&nacl->device_list_lock);
 261         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 262                 deve = &nacl->device_list[i];
 263
 264                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 265                         continue;
 266
 267                 lun = deve->se_lun;
 268                 if (!(lun)) {
 269                         printk(KERN_ERR "%s device entries device pointer is"
 270                                 " NULL, but Initiator has access.\n",
 271                                 tpg->se_tpg_tfo->get_fabric_name());
 272                         continue;
 273                 }
 274                 port = lun->lun_sep;
 275                 if (!(port)) {
 276                         printk(KERN_ERR "%s device entries device pointer is"
 277                                 " NULL, but Initiator has access.\n",
 278                                 tpg->se_tpg_tfo->get_fabric_name());
 279                         continue;
 280                 }
 281                 if (port->sep_rtpi != rtpi)
 282                         continue;
 283
 284                 atomic_inc(&deve->pr_ref_count);
 285                 smp_mb__after_atomic_inc();
 286                 spin_unlock_irq(&nacl->device_list_lock);
 287
 288                 return deve;
 289         }
 290         spin_unlock_irq(&nacl->device_list_lock);
 291
 292         return NULL;
 293 }
 294
 295 int core_free_device_list_for_node(
 296         struct se_node_acl *nacl,
 297         struct se_portal_group *tpg)
 298 {
 299         struct se_dev_entry *deve;
 300         struct se_lun *lun;
 301         u32 i;
 302
 303         if (!nacl->device_list)
 304                 return 0;
 305
 306         spin_lock_irq(&nacl->device_list_lock);
 307         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 308                 deve = &nacl->device_list[i];
 309
 310                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 311                         continue;
 312
 313                 if (!deve->se_lun) {
 314                         printk(KERN_ERR "%s device entries device pointer is"
 315                                 " NULL, but Initiator has access.\n",
 316                                 tpg->se_tpg_tfo->get_fabric_name());
 317                         continue;
 318                 }
 319                 lun = deve->se_lun;
 320
 321                 spin_unlock_irq(&nacl->device_list_lock);
 322                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 323                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 324                 spin_lock_irq(&nacl->device_list_lock);
 325         }
 326         spin_unlock_irq(&nacl->device_list_lock);
 327
 328         kfree(nacl->device_list);
 329         nacl->device_list = NULL;
 330
 331         return 0;
 332 }
 333
 334 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 335 {
 336         struct se_dev_entry *deve;
 337
 338         spin_lock_irq(&se_nacl->device_list_lock);
 339         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 340         deve->deve_cmds--;
 341         spin_unlock_irq(&se_nacl->device_list_lock);
 342 }
 343
 344 void core_update_device_list_access(
 345         u32 mapped_lun,
 346         u32 lun_access,
 347         struct se_node_acl *nacl)
 348 {
 349         struct se_dev_entry *deve;
 350
 351         spin_lock_irq(&nacl->device_list_lock);
 352         deve = &nacl->device_list[mapped_lun];
 353         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 354                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 355                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 356         } else {
 357                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 358                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 359         }
 360         spin_unlock_irq(&nacl->device_list_lock);
 361 }
 362
 363 /*      core_update_device_list_for_node():
 364  *
 365  *
 366  */
 367 int core_update_device_list_for_node(
 368         struct se_lun *lun,
 369         struct se_lun_acl *lun_acl,
 370         u32 mapped_lun,
 371         u32 lun_access,
 372         struct se_node_acl *nacl,
 373         struct se_portal_group *tpg,
 374         int enable)
 375 {
 376         struct se_port *port = lun->lun_sep;
 377         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 378         int trans = 0;
 379         /*
 380          * If the MappedLUN entry is being disabled, the entry in
 381          * port->sep_alua_list must be removed now before clearing the
 382          * struct se_dev_entry pointers below as logic in
 383          * core_alua_do_transition_tg_pt() depends on these being present.
 384          */
 385         if (!(enable)) {
 386                 /*
 387                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 388                  * that have not been explicitly concerted to MappedLUNs ->
 389                  * struct se_lun_acl, but we remove deve->alua_port_list from
 390                  * port->sep_alua_list. This also means that active UAs and
 391                  * NodeACL context specific PR metadata for demo-mode
 392                  * MappedLUN *deve will be released below..
 393                  */
 394                 spin_lock_bh(&port->sep_alua_lock);
 395                 list_del(&deve->alua_port_list);
 396                 spin_unlock_bh(&port->sep_alua_lock);
 397         }
 398
 399         spin_lock_irq(&nacl->device_list_lock);
 400         if (enable) {
 401                 /*
 402                  * Check if the call is handling demo mode -> explict LUN ACL
 403                  * transition.  This transition must be for the same struct se_lun
 404                  * + mapped_lun that was setup in demo mode..
 405                  */
 406                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 407                         if (deve->se_lun_acl != NULL) {
 408                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
 409                                         " already set for demo mode -> explict"
 410                                         " LUN ACL transition\n");
 411                                 spin_unlock_irq(&nacl->device_list_lock);
 412                                 return -EINVAL;
 413                         }
 414                         if (deve->se_lun != lun) {
 415                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
 416                                         " match passed struct se_lun for demo mode"
 417                                         " -> explict LUN ACL transition\n");
 418                                 spin_unlock_irq(&nacl->device_list_lock);
 419                                 return -EINVAL;
 420                         }
 421                         deve->se_lun_acl = lun_acl;
 422                         trans = 1;
 423                 } else {
 424                         deve->se_lun = lun;
 425                         deve->se_lun_acl = lun_acl;
 426                         deve->mapped_lun = mapped_lun;
 427                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 428                 }
 429
 430                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 431                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 432                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 433                 } else {
 434                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 435                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 436                 }
 437
 438                 if (trans) {
 439                         spin_unlock_irq(&nacl->device_list_lock);
 440                         return 0;
 441                 }
 442                 deve->creation_time = get_jiffies_64();
 443                 deve->attach_count++;
 444                 spin_unlock_irq(&nacl->device_list_lock);
 445
 446                 spin_lock_bh(&port->sep_alua_lock);
 447                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 448                 spin_unlock_bh(&port->sep_alua_lock);
 449
 450                 return 0;
 451         }
 452         /*
 453          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 454          * PR operation to complete.
 455          */
 456         spin_unlock_irq(&nacl->device_list_lock);
 457         while (atomic_read(&deve->pr_ref_count) != 0)
 458                 cpu_relax();
 459         spin_lock_irq(&nacl->device_list_lock);
 460         /*
 461          * Disable struct se_dev_entry LUN ACL mapping
 462          */
 463         core_scsi3_ua_release_all(deve);
 464         deve->se_lun = NULL;
 465         deve->se_lun_acl = NULL;
 466         deve->lun_flags = 0;
 467         deve->creation_time = 0;
 468         deve->attach_count--;
 469         spin_unlock_irq(&nacl->device_list_lock);
 470
 471         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 472         return 0;
 473 }
 474
 475 /*      core_clear_lun_from_tpg():
 476  *
 477  *
 478  */
 479 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 480 {
 481         struct se_node_acl *nacl;
 482         struct se_dev_entry *deve;
 483         u32 i;
 484
 485         spin_lock_bh(&tpg->acl_node_lock);
 486         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 487                 spin_unlock_bh(&tpg->acl_node_lock);
 488
 489                 spin_lock_irq(&nacl->device_list_lock);
 490                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 491                         deve = &nacl->device_list[i];
 492                         if (lun != deve->se_lun)
 493                                 continue;
 494                         spin_unlock_irq(&nacl->device_list_lock);
 495
 496                         core_update_device_list_for_node(lun, NULL,
 497                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 498                                 nacl, tpg, 0);
 499
 500                         spin_lock_irq(&nacl->device_list_lock);
 501                 }
 502                 spin_unlock_irq(&nacl->device_list_lock);
 503
 504                 spin_lock_bh(&tpg->acl_node_lock);
 505         }
 506         spin_unlock_bh(&tpg->acl_node_lock);
 507 }
 508
 509 static struct se_port *core_alloc_port(struct se_device *dev)
 510 {
 511         struct se_port *port, *port_tmp;
 512
 513         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 514         if (!(port)) {
 515                 printk(KERN_ERR "Unable to allocate struct se_port\n");
 516                 return ERR_PTR(-ENOMEM);
 517         }
 518         INIT_LIST_HEAD(&port->sep_alua_list);
 519         INIT_LIST_HEAD(&port->sep_list);
 520         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 521         spin_lock_init(&port->sep_alua_lock);
 522         mutex_init(&port->sep_tg_pt_md_mutex);
 523
 524         spin_lock(&dev->se_port_lock);
 525         if (dev->dev_port_count == 0x0000ffff) {
 526                 printk(KERN_WARNING "Reached dev->dev_port_count =="
 527                                 " 0x0000ffff\n");
 528                 spin_unlock(&dev->se_port_lock);
 529                 return ERR_PTR(-ENOSPC);
 530         }
 531 again:
 532         /*
 533          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 534          * Here is the table from spc4r17 section 7.7.3.8.
 535          *
 536          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 537          *
 538          * Code      Description
 539          * 0h        Reserved
 540          * 1h        Relative port 1, historically known as port A
 541          * 2h        Relative port 2, historically known as port B
 542          * 3h to FFFFh    Relative port 3 through 65 535
 543          */
 544         port->sep_rtpi = dev->dev_rpti_counter++;
 545         if (!(port->sep_rtpi))
 546                 goto again;
 547
 548         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 549                 /*
 550                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 551                  * for 16-bit wrap..
 552                  */
 553                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 554                         goto again;
 555         }
 556         spin_unlock(&dev->se_port_lock);
 557
 558         return port;
 559 }
 560
 561 static void core_export_port(
 562         struct se_device *dev,
 563         struct se_portal_group *tpg,
 564         struct se_port *port,
 565         struct se_lun *lun)
 566 {
 567         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 568         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 569
 570         spin_lock(&dev->se_port_lock);
 571         spin_lock(&lun->lun_sep_lock);
 572         port->sep_tpg = tpg;
 573         port->sep_lun = lun;
 574         lun->lun_sep = port;
 575         spin_unlock(&lun->lun_sep_lock);
 576
 577         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 578         spin_unlock(&dev->se_port_lock);
 579
 580         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 581                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 582                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 583                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
 584                                         "_gp_member_t\n");
 585                         return;
 586                 }
 587                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 588                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 589                         su_dev->t10_alua.default_tg_pt_gp);
 590                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 591                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
 592                         " Group: alua/default_tg_pt_gp\n",
 593                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 594         }
 595
 596         dev->dev_port_count++;
 597         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 598 }
 599
 600 /*
 601  *      Called with struct se_device->se_port_lock spinlock held.
 602  */
 603 static void core_release_port(struct se_device *dev, struct se_port *port)
 604         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 605 {
 606         /*
 607          * Wait for any port reference for PR ALL_TG_PT=1 operation
 608          * to complete in __core_scsi3_alloc_registration()
 609          */
 610         spin_unlock(&dev->se_port_lock);
 611         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 612                 cpu_relax();
 613         spin_lock(&dev->se_port_lock);
 614
 615         core_alua_free_tg_pt_gp_mem(port);
 616
 617         list_del(&port->sep_list);
 618         dev->dev_port_count--;
 619         kfree(port);
 620 }
 621
 622 int core_dev_export(
 623         struct se_device *dev,
 624         struct se_portal_group *tpg,
 625         struct se_lun *lun)
 626 {
 627         struct se_port *port;
 628
 629         port = core_alloc_port(dev);
 630         if (IS_ERR(port))
 631                 return PTR_ERR(port);
 632
 633         lun->lun_se_dev = dev;
 634         se_dev_start(dev);
 635
 636         atomic_inc(&dev->dev_export_obj.obj_access_count);
 637         core_export_port(dev, tpg, port, lun);
 638         return 0;
 639 }
 640
 641 void core_dev_unexport(
 642         struct se_device *dev,
 643         struct se_portal_group *tpg,
 644         struct se_lun *lun)
 645 {
 646         struct se_port *port = lun->lun_sep;
 647
 648         spin_lock(&lun->lun_sep_lock);
 649         if (lun->lun_se_dev == NULL) {
 650                 spin_unlock(&lun->lun_sep_lock);
 651                 return;
 652         }
 653         spin_unlock(&lun->lun_sep_lock);
 654
 655         spin_lock(&dev->se_port_lock);
 656         atomic_dec(&dev->dev_export_obj.obj_access_count);
 657         core_release_port(dev, port);
 658         spin_unlock(&dev->se_port_lock);
 659
 660         se_dev_stop(dev);
 661         lun->lun_se_dev = NULL;
 662 }
 663
 664 int transport_core_report_lun_response(struct se_cmd *se_cmd)
 665 {
 666         struct se_dev_entry *deve;
 667         struct se_lun *se_lun;
 668         struct se_session *se_sess = se_cmd->se_sess;
 669         struct se_task *se_task;
 670         unsigned char *buf = se_cmd->t_task->t_task_buf;
 671         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 672
 673         list_for_each_entry(se_task, &se_cmd->t_task->t_task_list, t_list)
 674                 break;
 675
 676         if (!(se_task)) {
 677                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
 678                 return PYX_TRANSPORT_LU_COMM_FAILURE;
 679         }
 680
 681         /*
 682          * If no struct se_session pointer is present, this struct se_cmd is
 683          * coming via a target_core_mod PASSTHROUGH op, and not through
 684          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 685          */
 686         if (!(se_sess)) {
 687                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 688                 lun_count = 1;
 689                 goto done;
 690         }
 691
 692         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 693         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 694                 deve = &se_sess->se_node_acl->device_list[i];
 695                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 696                         continue;
 697                 se_lun = deve->se_lun;
 698                 /*
 699                  * We determine the correct LUN LIST LENGTH even once we
 700                  * have reached the initial allocation length.
 701                  * See SPC2-R20 7.19.
 702                  */
 703                 lun_count++;
 704                 if ((cdb_offset + 8) >= se_cmd->data_length)
 705                         continue;
 706
 707                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 708                 offset += 8;
 709                 cdb_offset += 8;
 710         }
 711         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 712
 713         /*
 714          * See SPC3 r07, page 159.
 715          */
 716 done:
 717         lun_count *= 8;
 718         buf[0] = ((lun_count >> 24) & 0xff);
 719         buf[1] = ((lun_count >> 16) & 0xff);
 720         buf[2] = ((lun_count >> 8) & 0xff);
 721         buf[3] = (lun_count & 0xff);
 722
 723         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 724 }
 725
 726 /*      se_release_device_for_hba():
 727  *
 728  *
 729  */
 730 void se_release_device_for_hba(struct se_device *dev)
 731 {
 732         struct se_hba *hba = dev->se_hba;
 733
 734         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 735             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 736             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 737             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 738             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 739                 se_dev_stop(dev);
 740
 741         if (dev->dev_ptr) {
 742                 kthread_stop(dev->process_thread);
 743                 if (dev->transport->free_device)
 744                         dev->transport->free_device(dev->dev_ptr);
 745         }
 746
 747         spin_lock(&hba->device_lock);
 748         list_del(&dev->dev_list);
 749         hba->dev_count--;
 750         spin_unlock(&hba->device_lock);
 751
 752         core_scsi3_free_all_registrations(dev);
 753         se_release_vpd_for_dev(dev);
 754
 755         kfree(dev);
 756 }
 757
 758 void se_release_vpd_for_dev(struct se_device *dev)
 759 {
 760         struct t10_vpd *vpd, *vpd_tmp;
 761
 762         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 763         list_for_each_entry_safe(vpd, vpd_tmp,
 764                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 765                 list_del(&vpd->vpd_list);
 766                 kfree(vpd);
 767         }
 768         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 769 }
 770
 771 /*      se_free_virtual_device():
 772  *
 773  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 774  */
 775 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 776 {
 777         if (!list_empty(&dev->dev_sep_list))
 778                 dump_stack();
 779
 780         core_alua_free_lu_gp_mem(dev);
 781         se_release_device_for_hba(dev);
 782
 783         return 0;
 784 }
 785
 786 static void se_dev_start(struct se_device *dev)
 787 {
 788         struct se_hba *hba = dev->se_hba;
 789
 790         spin_lock(&hba->device_lock);
 791         atomic_inc(&dev->dev_obj.obj_access_count);
 792         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 793                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 794                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 795                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 796                 } else if (dev->dev_status &
 797                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 798                         dev->dev_status &=
 799                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 800                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 801                 }
 802         }
 803         spin_unlock(&hba->device_lock);
 804 }
 805
 806 static void se_dev_stop(struct se_device *dev)
 807 {
 808         struct se_hba *hba = dev->se_hba;
 809
 810         spin_lock(&hba->device_lock);
 811         atomic_dec(&dev->dev_obj.obj_access_count);
 812         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 813                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 814                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 815                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 816                 } else if (dev->dev_status &
 817                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 818                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 819                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 820                 }
 821         }
 822         spin_unlock(&hba->device_lock);
 823 }
 824
 825 int se_dev_check_online(struct se_device *dev)
 826 {
 827         int ret;
 828
 829         spin_lock_irq(&dev->dev_status_lock);
 830         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 831                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 832         spin_unlock_irq(&dev->dev_status_lock);
 833
 834         return ret;
 835 }
 836
 837 int se_dev_check_shutdown(struct se_device *dev)
 838 {
 839         int ret;
 840
 841         spin_lock_irq(&dev->dev_status_lock);
 842         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 843         spin_unlock_irq(&dev->dev_status_lock);
 844
 845         return ret;
 846 }
 847
 848 void se_dev_set_default_attribs(
 849         struct se_device *dev,
 850         struct se_dev_limits *dev_limits)
 851 {
 852         struct queue_limits *limits = &dev_limits->limits;
 853
 854         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 855         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 856         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 857         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 858         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 859         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 860         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 861         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 862         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 863         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 864         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 865         /*
 866          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 867          * iblock_create_virtdevice() from struct queue_limits values
 868          * if blk_queue_discard()==1
 869          */
 870         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 871         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 872                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 873         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 874         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 875                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 876         /*
 877          * block_size is based on subsystem plugin dependent requirements.
 878          */
 879         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 880         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 881         /*
 882          * max_sectors is based on subsystem plugin dependent requirements.
 883          */
 884         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 885         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 886         /*
 887          * Set optimal_sectors from max_sectors, which can be lowered via
 888          * configfs.
 889          */
 890         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
 891         /*
 892          * queue_depth is based on subsystem plugin dependent requirements.
 893          */
 894         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 895         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 896 }
 897
 898 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
 899 {
 900         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
 901                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
 902                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
 903                 return -EINVAL;
 904         } else {
 905                 dev->se_sub_dev->se_dev_attrib.task_timeout = task_timeout;
 906                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
 907                         dev, task_timeout);
 908         }
 909
 910         return 0;
 911 }
 912
 913 int se_dev_set_max_unmap_lba_count(
 914         struct se_device *dev,
 915         u32 max_unmap_lba_count)
 916 {
 917         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 918         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
 919                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 920         return 0;
 921 }
 922
 923 int se_dev_set_max_unmap_block_desc_count(
 924         struct se_device *dev,
 925         u32 max_unmap_block_desc_count)
 926 {
 927         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 928                 max_unmap_block_desc_count;
 929         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
 930                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 931         return 0;
 932 }
 933
 934 int se_dev_set_unmap_granularity(
 935         struct se_device *dev,
 936         u32 unmap_granularity)
 937 {
 938         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 939         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
 940                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 941         return 0;
 942 }
 943
 944 int se_dev_set_unmap_granularity_alignment(
 945         struct se_device *dev,
 946         u32 unmap_granularity_alignment)
 947 {
 948         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 949         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
 950                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 951         return 0;
 952 }
 953
 954 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 955 {
 956         if ((flag != 0) && (flag != 1)) {
 957                 printk(KERN_ERR "Illegal value %d\n", flag);
 958                 return -EINVAL;
 959         }
 960         if (dev->transport->dpo_emulated == NULL) {
 961                 printk(KERN_ERR "dev->transport->dpo_emulated is NULL\n");
 962                 return -EINVAL;
 963         }
 964         if (dev->transport->dpo_emulated(dev) == 0) {
 965                 printk(KERN_ERR "dev->transport->dpo_emulated not supported\n");
 966                 return -EINVAL;
 967         }
 968         dev->se_sub_dev->se_dev_attrib.emulate_dpo = flag;
 969         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
 970                         " bit: %d\n", dev, dev->se_sub_dev->se_dev_attrib.emulate_dpo);
 971         return 0;
 972 }
 973
 974 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 975 {
 976         if ((flag != 0) && (flag != 1)) {
 977                 printk(KERN_ERR "Illegal value %d\n", flag);
 978                 return -EINVAL;
 979         }
 980         if (dev->transport->fua_write_emulated == NULL) {
 981                 printk(KERN_ERR "dev->transport->fua_write_emulated is NULL\n");
 982                 return -EINVAL;
 983         }
 984         if (dev->transport->fua_write_emulated(dev) == 0) {
 985                 printk(KERN_ERR "dev->transport->fua_write_emulated not supported\n");
 986                 return -EINVAL;
 987         }
 988         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 989         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 990                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 991         return 0;
 992 }
 993
 994 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 995 {
 996         if ((flag != 0) && (flag != 1)) {
 997                 printk(KERN_ERR "Illegal value %d\n", flag);
 998                 return -EINVAL;
 999         }
1000         if (dev->transport->fua_read_emulated == NULL) {
1001                 printk(KERN_ERR "dev->transport->fua_read_emulated is NULL\n");
1002                 return -EINVAL;
1003         }
1004         if (dev->transport->fua_read_emulated(dev) == 0) {
1005                 printk(KERN_ERR "dev->transport->fua_read_emulated not supported\n");
1006                 return -EINVAL;
1007         }
1008         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = flag;
1009         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1010                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_read);
1011         return 0;
1012 }
1013
1014 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1015 {
1016         if ((flag != 0) && (flag != 1)) {
1017                 printk(KERN_ERR "Illegal value %d\n", flag);
1018                 return -EINVAL;
1019         }
1020         if (dev->transport->write_cache_emulated == NULL) {
1021                 printk(KERN_ERR "dev->transport->write_cache_emulated is NULL\n");
1022                 return -EINVAL;
1023         }
1024         if (dev->transport->write_cache_emulated(dev) == 0) {
1025                 printk(KERN_ERR "dev->transport->write_cache_emulated not supported\n");
1026                 return -EINVAL;
1027         }
1028         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1029         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1030                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1031         return 0;
1032 }
1033
1034 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1035 {
1036         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1037                 printk(KERN_ERR "Illegal value %d\n", flag);
1038                 return -EINVAL;
1039         }
1040
1041         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1042                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1043                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1044                         " exists\n", dev,
1045                         atomic_read(&dev->dev_export_obj.obj_access_count));
1046                 return -EINVAL;
1047         }
1048         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1049         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1050                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1051
1052         return 0;
1053 }
1054
1055 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1056 {
1057         if ((flag != 0) && (flag != 1)) {
1058                 printk(KERN_ERR "Illegal value %d\n", flag);
1059                 return -EINVAL;
1060         }
1061
1062         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1063                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1064                         " dev_export_obj: %d count exists\n", dev,
1065                         atomic_read(&dev->dev_export_obj.obj_access_count));
1066                 return -EINVAL;
1067         }
1068         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1069         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1070                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1071
1072         return 0;
1073 }
1074
1075 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1076 {
1077         if ((flag != 0) && (flag != 1)) {
1078                 printk(KERN_ERR "Illegal value %d\n", flag);
1079                 return -EINVAL;
1080         }
1081         /*
1082          * We expect this value to be non-zero when generic Block Layer
1083          * Discard supported is detected iblock_create_virtdevice().
1084          */
1085         if (!(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count)) {
1086                 printk(KERN_ERR "Generic Block Discard not supported\n");
1087                 return -ENOSYS;
1088         }
1089
1090         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1091         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1092                                 dev, flag);
1093         return 0;
1094 }
1095
1096 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1097 {
1098         if ((flag != 0) && (flag != 1)) {
1099                 printk(KERN_ERR "Illegal value %d\n", flag);
1100                 return -EINVAL;
1101         }
1102         /*
1103          * We expect this value to be non-zero when generic Block Layer
1104          * Discard supported is detected iblock_create_virtdevice().
1105          */
1106         if (!(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count)) {
1107                 printk(KERN_ERR "Generic Block Discard not supported\n");
1108                 return -ENOSYS;
1109         }
1110
1111         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1112         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1113                                 dev, flag);
1114         return 0;
1115 }
1116
1117 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1118 {
1119         if ((flag != 0) && (flag != 1)) {
1120                 printk(KERN_ERR "Illegal value %d\n", flag);
1121                 return -EINVAL;
1122         }
1123         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1124         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1125                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1126         return 0;
1127 }
1128
1129 /*
1130  * Note, this can only be called on unexported SE Device Object.
1131  */
1132 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1133 {
1134         u32 orig_queue_depth = dev->queue_depth;
1135
1136         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1137                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1138                         " dev_export_obj: %d count exists\n", dev,
1139                         atomic_read(&dev->dev_export_obj.obj_access_count));
1140                 return -EINVAL;
1141         }
1142         if (!(queue_depth)) {
1143                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1144                         "_depth\n", dev);
1145                 return -EINVAL;
1146         }
1147
1148         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1149                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1150                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1151                                 " exceeds TCM/SE_Device TCQ: %u\n",
1152                                 dev, queue_depth,
1153                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1154                         return -EINVAL;
1155                 }
1156         } else {
1157                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1158                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1159                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1160                                         " %u exceeds TCM/SE_Device MAX"
1161                                         " TCQ: %u\n", dev, queue_depth,
1162                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1163                                 return -EINVAL;
1164                         }
1165                 }
1166         }
1167
1168         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1169         if (queue_depth > orig_queue_depth)
1170                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1171         else if (queue_depth < orig_queue_depth)
1172                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1173
1174         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1175                         dev, queue_depth);
1176         return 0;
1177 }
1178
1179 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1180 {
1181         int force = 0; /* Force setting for VDEVS */
1182
1183         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1184                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1185                         " max_sectors while dev_export_obj: %d count exists\n",
1186                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1187                 return -EINVAL;
1188         }
1189         if (!(max_sectors)) {
1190                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1191                         " max_sectors\n", dev);
1192                 return -EINVAL;
1193         }
1194         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1195                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1196                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1197                                 DA_STATUS_MAX_SECTORS_MIN);
1198                 return -EINVAL;
1199         }
1200         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1201                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1202                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1203                                 " greater than TCM/SE_Device max_sectors:"
1204                                 " %u\n", dev, max_sectors,
1205                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1206                          return -EINVAL;
1207                 }
1208         } else {
1209                 if (!(force) && (max_sectors >
1210                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1211                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1212                                 " greater than TCM/SE_Device max_sectors"
1213                                 ": %u, use force=1 to override.\n", dev,
1214                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1215                         return -EINVAL;
1216                 }
1217                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1218                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1219                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1220                                 " %u\n", dev, max_sectors,
1221                                 DA_STATUS_MAX_SECTORS_MAX);
1222                         return -EINVAL;
1223                 }
1224         }
1225
1226         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1227         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1228                         dev, max_sectors);
1229         return 0;
1230 }
1231
1232 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1233 {
1234         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1235                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1236                         " optimal_sectors while dev_export_obj: %d count exists\n",
1237                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1238                 return -EINVAL;
1239         }
1240         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1241                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1242                                 " changed for TCM/pSCSI\n", dev);
1243                 return -EINVAL;
1244         }
1245         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1246                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1247                         " greater than max_sectors: %u\n", dev,
1248                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1249                 return -EINVAL;
1250         }
1251
1252         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1253         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1254                         dev, optimal_sectors);
1255         return 0;
1256 }
1257
1258 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1259 {
1260         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1261                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1262                         " while dev_export_obj: %d count exists\n", dev,
1263                         atomic_read(&dev->dev_export_obj.obj_access_count));
1264                 return -EINVAL;
1265         }
1266
1267         if ((block_size != 512) &&
1268             (block_size != 1024) &&
1269             (block_size != 2048) &&
1270             (block_size != 4096)) {
1271                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1272                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1273                         dev, block_size);
1274                 return -EINVAL;
1275         }
1276
1277         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1278                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1279                         " Physical Device, use for Linux/SCSI to change"
1280                         " block_size for underlying hardware\n", dev);
1281                 return -EINVAL;
1282         }
1283
1284         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1285         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1286                         dev, block_size);
1287         return 0;
1288 }
1289
1290 struct se_lun *core_dev_add_lun(
1291         struct se_portal_group *tpg,
1292         struct se_hba *hba,
1293         struct se_device *dev,
1294         u32 lun)
1295 {
1296         struct se_lun *lun_p;
1297         u32 lun_access = 0;
1298
1299         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1300                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1301                         atomic_read(&dev->dev_access_obj.obj_access_count));
1302                 return NULL;
1303         }
1304
1305         lun_p = core_tpg_pre_addlun(tpg, lun);
1306         if ((IS_ERR(lun_p)) || !(lun_p))
1307                 return NULL;
1308
1309         if (dev->dev_flags & DF_READ_ONLY)
1310                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1311         else
1312                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1313
1314         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1315                 return NULL;
1316
1317         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1318                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1319                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1320                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1321         /*
1322          * Update LUN maps for dynamically added initiators when
1323          * generate_node_acl is enabled.
1324          */
1325         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1326                 struct se_node_acl *acl;
1327                 spin_lock_bh(&tpg->acl_node_lock);
1328                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1329                         if (acl->dynamic_node_acl) {
1330                                 spin_unlock_bh(&tpg->acl_node_lock);
1331                                 core_tpg_add_node_to_devs(acl, tpg);
1332                                 spin_lock_bh(&tpg->acl_node_lock);
1333                         }
1334                 }
1335                 spin_unlock_bh(&tpg->acl_node_lock);
1336         }
1337
1338         return lun_p;
1339 }
1340
1341 /*      core_dev_del_lun():
1342  *
1343  *
1344  */
1345 int core_dev_del_lun(
1346         struct se_portal_group *tpg,
1347         u32 unpacked_lun)
1348 {
1349         struct se_lun *lun;
1350         int ret = 0;
1351
1352         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1353         if (!(lun))
1354                 return ret;
1355
1356         core_tpg_post_dellun(tpg, lun);
1357
1358         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1359                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1360                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1361                 tpg->se_tpg_tfo->get_fabric_name());
1362
1363         return 0;
1364 }
1365
1366 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1367 {
1368         struct se_lun *lun;
1369
1370         spin_lock(&tpg->tpg_lun_lock);
1371         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1372                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1373                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1374                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1375                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1376                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1377                 spin_unlock(&tpg->tpg_lun_lock);
1378                 return NULL;
1379         }
1380         lun = &tpg->tpg_lun_list[unpacked_lun];
1381
1382         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1383                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1384                         " Target Portal Group: %hu, ignoring request.\n",
1385                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1386                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1387                 spin_unlock(&tpg->tpg_lun_lock);
1388                 return NULL;
1389         }
1390         spin_unlock(&tpg->tpg_lun_lock);
1391
1392         return lun;
1393 }
1394
1395 /*      core_dev_get_lun():
1396  *
1397  *
1398  */
1399 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1400 {
1401         struct se_lun *lun;
1402
1403         spin_lock(&tpg->tpg_lun_lock);
1404         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1405                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1406                         "_TPG-1: %u for Target Portal Group: %hu\n",
1407                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1408                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1409                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1410                 spin_unlock(&tpg->tpg_lun_lock);
1411                 return NULL;
1412         }
1413         lun = &tpg->tpg_lun_list[unpacked_lun];
1414
1415         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1416                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1417                         " Target Portal Group: %hu, ignoring request.\n",
1418                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1419                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1420                 spin_unlock(&tpg->tpg_lun_lock);
1421                 return NULL;
1422         }
1423         spin_unlock(&tpg->tpg_lun_lock);
1424
1425         return lun;
1426 }
1427
1428 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1429         struct se_portal_group *tpg,
1430         u32 mapped_lun,
1431         char *initiatorname,
1432         int *ret)
1433 {
1434         struct se_lun_acl *lacl;
1435         struct se_node_acl *nacl;
1436
1437         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1438                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1439                         tpg->se_tpg_tfo->get_fabric_name());
1440                 *ret = -EOVERFLOW;
1441                 return NULL;
1442         }
1443         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1444         if (!(nacl)) {
1445                 *ret = -EINVAL;
1446                 return NULL;
1447         }
1448         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1449         if (!(lacl)) {
1450                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1451                 *ret = -ENOMEM;
1452                 return NULL;
1453         }
1454
1455         INIT_LIST_HEAD(&lacl->lacl_list);
1456         lacl->mapped_lun = mapped_lun;
1457         lacl->se_lun_nacl = nacl;
1458         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1459
1460         return lacl;
1461 }
1462
1463 int core_dev_add_initiator_node_lun_acl(
1464         struct se_portal_group *tpg,
1465         struct se_lun_acl *lacl,
1466         u32 unpacked_lun,
1467         u32 lun_access)
1468 {
1469         struct se_lun *lun;
1470         struct se_node_acl *nacl;
1471
1472         lun = core_dev_get_lun(tpg, unpacked_lun);
1473         if (!(lun)) {
1474                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1475                         " Target Portal Group: %hu, ignoring request.\n",
1476                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1477                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1478                 return -EINVAL;
1479         }
1480
1481         nacl = lacl->se_lun_nacl;
1482         if (!(nacl))
1483                 return -EINVAL;
1484
1485         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1486             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1487                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1488
1489         lacl->se_lun = lun;
1490
1491         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1492                         lun_access, nacl, tpg, 1) < 0)
1493                 return -EINVAL;
1494
1495         spin_lock(&lun->lun_acl_lock);
1496         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1497         atomic_inc(&lun->lun_acl_count);
1498         smp_mb__after_atomic_inc();
1499         spin_unlock(&lun->lun_acl_lock);
1500
1501         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1502                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1503                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1504                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1505                 lacl->initiatorname);
1506         /*
1507          * Check to see if there are any existing persistent reservation APTPL
1508          * pre-registrations that need to be enabled for this LUN ACL..
1509          */
1510         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1511         return 0;
1512 }
1513
1514 /*      core_dev_del_initiator_node_lun_acl():
1515  *
1516  *
1517  */
1518 int core_dev_del_initiator_node_lun_acl(
1519         struct se_portal_group *tpg,
1520         struct se_lun *lun,
1521         struct se_lun_acl *lacl)
1522 {
1523         struct se_node_acl *nacl;
1524
1525         nacl = lacl->se_lun_nacl;
1526         if (!(nacl))
1527                 return -EINVAL;
1528
1529         spin_lock(&lun->lun_acl_lock);
1530         list_del(&lacl->lacl_list);
1531         atomic_dec(&lun->lun_acl_count);
1532         smp_mb__after_atomic_dec();
1533         spin_unlock(&lun->lun_acl_lock);
1534
1535         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1536                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1537
1538         lacl->se_lun = NULL;
1539
1540         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1541                 " InitiatorNode: %s Mapped LUN: %u\n",
1542                 tpg->se_tpg_tfo->get_fabric_name(),
1543                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1544                 lacl->initiatorname, lacl->mapped_lun);
1545
1546         return 0;
1547 }
1548
1549 void core_dev_free_initiator_node_lun_acl(
1550         struct se_portal_group *tpg,
1551         struct se_lun_acl *lacl)
1552 {
1553         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1554                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1555                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1556                 tpg->se_tpg_tfo->get_fabric_name(),
1557                 lacl->initiatorname, lacl->mapped_lun);
1558
1559         kfree(lacl);
1560 }
1561
1562 int core_dev_setup_virtual_lun0(void)
1563 {
1564         struct se_hba *hba;
1565         struct se_device *dev;
1566         struct se_subsystem_dev *se_dev = NULL;
1567         struct se_subsystem_api *t;
1568         char buf[16];
1569         int ret;
1570
1571         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1572         if (IS_ERR(hba))
1573                 return PTR_ERR(hba);
1574
1575         lun0_hba = hba;
1576         t = hba->transport;
1577
1578         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1579         if (!(se_dev)) {
1580                 printk(KERN_ERR "Unable to allocate memory for"
1581                                 " struct se_subsystem_dev\n");
1582                 ret = -ENOMEM;
1583                 goto out;
1584         }
1585         INIT_LIST_HEAD(&se_dev->se_dev_node);
1586         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1587         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1588         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1589         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1590         spin_lock_init(&se_dev->t10_pr.registration_lock);
1591         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1592         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1593         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1594         spin_lock_init(&se_dev->se_dev_lock);
1595         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1596         se_dev->t10_wwn.t10_sub_dev = se_dev;
1597         se_dev->t10_alua.t10_sub_dev = se_dev;
1598         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1599         se_dev->se_dev_hba = hba;
1600
1601         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1602         if (!(se_dev->se_dev_su_ptr)) {
1603                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1604                         " from allocate_virtdevice()\n");
1605                 ret = -ENOMEM;
1606                 goto out;
1607         }
1608         lun0_su_dev = se_dev;
1609
1610         memset(buf, 0, 16);
1611         sprintf(buf, "rd_pages=8");
1612         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1613
1614         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1615         if (IS_ERR(dev)) {
1616                 ret = PTR_ERR(dev);
1617                 goto out;
1618         }
1619         se_dev->se_dev_ptr = dev;
1620         g_lun0_dev = dev;
1621
1622         return 0;
1623 out:
1624         lun0_su_dev = NULL;
1625         kfree(se_dev);
1626         if (lun0_hba) {
1627                 core_delete_hba(lun0_hba);
1628                 lun0_hba = NULL;
1629         }
1630         return ret;
1631 }
1632
1633
1634 void core_dev_release_virtual_lun0(void)
1635 {
1636         struct se_hba *hba = lun0_hba;
1637         struct se_subsystem_dev *su_dev = lun0_su_dev;
1638
1639         if (!(hba))
1640                 return;
1641
1642         if (g_lun0_dev)
1643                 se_free_virtual_device(g_lun0_dev, hba);
1644
1645         kfree(su_dev);
1646         core_delete_hba(hba);
1647 }