drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the iSCSI Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <net/sock.h>
  39 #include <net/tcp.h>
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_device.h>
  42
  43 #include <target/target_core_base.h>
  44 #include <target/target_core_device.h>
  45 #include <target/target_core_tpg.h>
  46 #include <target/target_core_transport.h>
  47 #include <target/target_core_fabric_ops.h>
  48
  49 #include "target_core_alua.h"
  50 #include "target_core_hba.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_ua.h"
  53
  54 static void se_dev_start(struct se_device *dev);
  55 static void se_dev_stop(struct se_device *dev);
  56
  57 int transport_get_lun_for_cmd(
  58         struct se_cmd *se_cmd,
  59         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         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  68                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  69                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  70                 return -1;
  71         }
  72
  73         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
  74         deve = se_cmd->se_deve =
  75                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
  76         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                 if (se_cmd) {
  78                         deve->total_cmds++;
  79                         deve->total_bytes += se_cmd->data_length;
  80
  81                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
  82                                 if (deve->lun_flags &
  83                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
  84                                         read_only = 1;
  85                                         goto out;
  86                                 }
  87                                 deve->write_bytes += se_cmd->data_length;
  88                         } else if (se_cmd->data_direction ==
  89                                    DMA_FROM_DEVICE) {
  90                                 deve->read_bytes += se_cmd->data_length;
  91                         }
  92                 }
  93                 deve->deve_cmds++;
  94
  95                 se_lun = se_cmd->se_lun = deve->se_lun;
  96                 se_cmd->pr_res_key = deve->pr_res_key;
  97                 se_cmd->orig_fe_lun = unpacked_lun;
  98                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
  99                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 100         }
 101 out:
 102         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 103
 104         if (!se_lun) {
 105                 if (read_only) {
 106                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 107                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 108                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
 109                                 " Access for 0x%08x\n",
 110                                 CMD_TFO(se_cmd)->get_fabric_name(),
 111                                 unpacked_lun);
 112                         return -1;
 113                 } else {
 114                         /*
 115                          * Use the se_portal_group->tpg_virt_lun0 to allow for
 116                          * REPORT_LUNS, et al to be returned when no active
 117                          * MappedLUN=0 exists for this Initiator Port.
 118                          */
 119                         if (unpacked_lun != 0) {
 120                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 121                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 122                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 123                                         " Access for 0x%08x\n",
 124                                         CMD_TFO(se_cmd)->get_fabric_name(),
 125                                         unpacked_lun);
 126                                 return -1;
 127                         }
 128                         /*
 129                          * Force WRITE PROTECT for virtual LUN 0
 130                          */
 131                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 132                             (se_cmd->data_direction != DMA_NONE)) {
 133                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 134                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 135                                 return -1;
 136                         }
 137 #if 0
 138                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
 139                                 CMD_TFO(se_cmd)->get_fabric_name());
 140 #endif
 141                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 142                         se_cmd->orig_fe_lun = 0;
 143                         se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 144                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 145                 }
 146         }
 147         /*
 148          * Determine if the struct se_lun is online.
 149          */
 150 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 151         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 152                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 153                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 154                 return -1;
 155         }
 156
 157         {
 158         struct se_device *dev = se_lun->lun_se_dev;
 159         spin_lock_irq(&dev->stats_lock);
 160         dev->num_cmds++;
 161         if (se_cmd->data_direction == DMA_TO_DEVICE)
 162                 dev->write_bytes += se_cmd->data_length;
 163         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 164                 dev->read_bytes += se_cmd->data_length;
 165         spin_unlock_irq(&dev->stats_lock);
 166         }
 167
 168         /*
 169          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 170          * for tracking state of struct se_cmds during LUN shutdown events.
 171          */
 172         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 173         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
 174         atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
 175 #if 0
 176         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
 177                 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
 178 #endif
 179         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 180
 181         return 0;
 182 }
 183 EXPORT_SYMBOL(transport_get_lun_for_cmd);
 184
 185 int transport_get_lun_for_tmr(
 186         struct se_cmd *se_cmd,
 187         u32 unpacked_lun)
 188 {
 189         struct se_device *dev = NULL;
 190         struct se_dev_entry *deve;
 191         struct se_lun *se_lun = NULL;
 192         struct se_session *se_sess = SE_SESS(se_cmd);
 193         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 194
 195         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 196                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 197                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 198                 return -1;
 199         }
 200
 201         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 202         deve = se_cmd->se_deve =
 203                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
 204         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 205                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
 206                 dev = se_lun->lun_se_dev;
 207                 se_cmd->pr_res_key = deve->pr_res_key;
 208                 se_cmd->orig_fe_lun = unpacked_lun;
 209                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
 210 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
 211         }
 212         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 213
 214         if (!se_lun) {
 215                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 216                         " Access for 0x%08x\n",
 217                         CMD_TFO(se_cmd)->get_fabric_name(),
 218                         unpacked_lun);
 219                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 220                 return -1;
 221         }
 222         /*
 223          * Determine if the struct se_lun is online.
 224          */
 225 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
 226         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 227                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 228                 return -1;
 229         }
 230         se_tmr->tmr_dev = dev;
 231
 232         spin_lock(&dev->se_tmr_lock);
 233         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
 234         spin_unlock(&dev->se_tmr_lock);
 235
 236         return 0;
 237 }
 238 EXPORT_SYMBOL(transport_get_lun_for_tmr);
 239
 240 /*
 241  * This function is called from core_scsi3_emulate_pro_register_and_move()
 242  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 243  * when a matching rtpi is found.
 244  */
 245 struct se_dev_entry *core_get_se_deve_from_rtpi(
 246         struct se_node_acl *nacl,
 247         u16 rtpi)
 248 {
 249         struct se_dev_entry *deve;
 250         struct se_lun *lun;
 251         struct se_port *port;
 252         struct se_portal_group *tpg = nacl->se_tpg;
 253         u32 i;
 254
 255         spin_lock_irq(&nacl->device_list_lock);
 256         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 257                 deve = &nacl->device_list[i];
 258
 259                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 260                         continue;
 261
 262                 lun = deve->se_lun;
 263                 if (!(lun)) {
 264                         printk(KERN_ERR "%s device entries device pointer is"
 265                                 " NULL, but Initiator has access.\n",
 266                                 TPG_TFO(tpg)->get_fabric_name());
 267                         continue;
 268                 }
 269                 port = lun->lun_sep;
 270                 if (!(port)) {
 271                         printk(KERN_ERR "%s device entries device pointer is"
 272                                 " NULL, but Initiator has access.\n",
 273                                 TPG_TFO(tpg)->get_fabric_name());
 274                         continue;
 275                 }
 276                 if (port->sep_rtpi != rtpi)
 277                         continue;
 278
 279                 atomic_inc(&deve->pr_ref_count);
 280                 smp_mb__after_atomic_inc();
 281                 spin_unlock_irq(&nacl->device_list_lock);
 282
 283                 return deve;
 284         }
 285         spin_unlock_irq(&nacl->device_list_lock);
 286
 287         return NULL;
 288 }
 289
 290 int core_free_device_list_for_node(
 291         struct se_node_acl *nacl,
 292         struct se_portal_group *tpg)
 293 {
 294         struct se_dev_entry *deve;
 295         struct se_lun *lun;
 296         u32 i;
 297
 298         if (!nacl->device_list)
 299                 return 0;
 300
 301         spin_lock_irq(&nacl->device_list_lock);
 302         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 303                 deve = &nacl->device_list[i];
 304
 305                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 306                         continue;
 307
 308                 if (!deve->se_lun) {
 309                         printk(KERN_ERR "%s device entries device pointer is"
 310                                 " NULL, but Initiator has access.\n",
 311                                 TPG_TFO(tpg)->get_fabric_name());
 312                         continue;
 313                 }
 314                 lun = deve->se_lun;
 315
 316                 spin_unlock_irq(&nacl->device_list_lock);
 317                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 318                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 319                 spin_lock_irq(&nacl->device_list_lock);
 320         }
 321         spin_unlock_irq(&nacl->device_list_lock);
 322
 323         kfree(nacl->device_list);
 324         nacl->device_list = NULL;
 325
 326         return 0;
 327 }
 328
 329 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 330 {
 331         struct se_dev_entry *deve;
 332
 333         spin_lock_irq(&se_nacl->device_list_lock);
 334         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 335         deve->deve_cmds--;
 336         spin_unlock_irq(&se_nacl->device_list_lock);
 337
 338         return;
 339 }
 340
 341 void core_update_device_list_access(
 342         u32 mapped_lun,
 343         u32 lun_access,
 344         struct se_node_acl *nacl)
 345 {
 346         struct se_dev_entry *deve;
 347
 348         spin_lock_irq(&nacl->device_list_lock);
 349         deve = &nacl->device_list[mapped_lun];
 350         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 351                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 352                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 353         } else {
 354                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 355                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 356         }
 357         spin_unlock_irq(&nacl->device_list_lock);
 358
 359         return;
 360 }
 361
 362 /*      core_update_device_list_for_node():
 363  *
 364  *
 365  */
 366 int core_update_device_list_for_node(
 367         struct se_lun *lun,
 368         struct se_lun_acl *lun_acl,
 369         u32 mapped_lun,
 370         u32 lun_access,
 371         struct se_node_acl *nacl,
 372         struct se_portal_group *tpg,
 373         int enable)
 374 {
 375         struct se_port *port = lun->lun_sep;
 376         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 377         int trans = 0;
 378         /*
 379          * If the MappedLUN entry is being disabled, the entry in
 380          * port->sep_alua_list must be removed now before clearing the
 381          * struct se_dev_entry pointers below as logic in
 382          * core_alua_do_transition_tg_pt() depends on these being present.
 383          */
 384         if (!(enable)) {
 385                 /*
 386                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 387                  * that have not been explicitly concerted to MappedLUNs ->
 388                  * struct se_lun_acl, but we remove deve->alua_port_list from
 389                  * port->sep_alua_list. This also means that active UAs and
 390                  * NodeACL context specific PR metadata for demo-mode
 391                  * MappedLUN *deve will be released below..
 392                  */
 393                 spin_lock_bh(&port->sep_alua_lock);
 394                 list_del(&deve->alua_port_list);
 395                 spin_unlock_bh(&port->sep_alua_lock);
 396         }
 397
 398         spin_lock_irq(&nacl->device_list_lock);
 399         if (enable) {
 400                 /*
 401                  * Check if the call is handling demo mode -> explict LUN ACL
 402                  * transition.  This transition must be for the same struct se_lun
 403                  * + mapped_lun that was setup in demo mode..
 404                  */
 405                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 406                         if (deve->se_lun_acl != NULL) {
 407                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
 408                                         " already set for demo mode -> explict"
 409                                         " LUN ACL transition\n");
 410                                 spin_unlock_irq(&nacl->device_list_lock);
 411                                 return -1;
 412                         }
 413                         if (deve->se_lun != lun) {
 414                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
 415                                         " match passed struct se_lun for demo mode"
 416                                         " -> explict LUN ACL transition\n");
 417                                 spin_unlock_irq(&nacl->device_list_lock);
 418                                 return -1;
 419                         }
 420                         deve->se_lun_acl = lun_acl;
 421                         trans = 1;
 422                 } else {
 423                         deve->se_lun = lun;
 424                         deve->se_lun_acl = lun_acl;
 425                         deve->mapped_lun = mapped_lun;
 426                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 427                 }
 428
 429                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 430                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 431                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 432                 } else {
 433                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 434                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 435                 }
 436
 437                 if (trans) {
 438                         spin_unlock_irq(&nacl->device_list_lock);
 439                         return 0;
 440                 }
 441                 deve->creation_time = get_jiffies_64();
 442                 deve->attach_count++;
 443                 spin_unlock_irq(&nacl->device_list_lock);
 444
 445                 spin_lock_bh(&port->sep_alua_lock);
 446                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 447                 spin_unlock_bh(&port->sep_alua_lock);
 448
 449                 return 0;
 450         }
 451         /*
 452          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 453          * PR operation to complete.
 454          */
 455         spin_unlock_irq(&nacl->device_list_lock);
 456         while (atomic_read(&deve->pr_ref_count) != 0)
 457                 cpu_relax();
 458         spin_lock_irq(&nacl->device_list_lock);
 459         /*
 460          * Disable struct se_dev_entry LUN ACL mapping
 461          */
 462         core_scsi3_ua_release_all(deve);
 463         deve->se_lun = NULL;
 464         deve->se_lun_acl = NULL;
 465         deve->lun_flags = 0;
 466         deve->creation_time = 0;
 467         deve->attach_count--;
 468         spin_unlock_irq(&nacl->device_list_lock);
 469
 470         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 471         return 0;
 472 }
 473
 474 /*      core_clear_lun_from_tpg():
 475  *
 476  *
 477  */
 478 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 479 {
 480         struct se_node_acl *nacl;
 481         struct se_dev_entry *deve;
 482         u32 i;
 483
 484         spin_lock_bh(&tpg->acl_node_lock);
 485         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 486                 spin_unlock_bh(&tpg->acl_node_lock);
 487
 488                 spin_lock_irq(&nacl->device_list_lock);
 489                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 490                         deve = &nacl->device_list[i];
 491                         if (lun != deve->se_lun)
 492                                 continue;
 493                         spin_unlock_irq(&nacl->device_list_lock);
 494
 495                         core_update_device_list_for_node(lun, NULL,
 496                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 497                                 nacl, tpg, 0);
 498
 499                         spin_lock_irq(&nacl->device_list_lock);
 500                 }
 501                 spin_unlock_irq(&nacl->device_list_lock);
 502
 503                 spin_lock_bh(&tpg->acl_node_lock);
 504         }
 505         spin_unlock_bh(&tpg->acl_node_lock);
 506
 507         return;
 508 }
 509
 510 static struct se_port *core_alloc_port(struct se_device *dev)
 511 {
 512         struct se_port *port, *port_tmp;
 513
 514         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 515         if (!(port)) {
 516                 printk(KERN_ERR "Unable to allocate struct se_port\n");
 517                 return NULL;
 518         }
 519         INIT_LIST_HEAD(&port->sep_alua_list);
 520         INIT_LIST_HEAD(&port->sep_list);
 521         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 522         spin_lock_init(&port->sep_alua_lock);
 523         mutex_init(&port->sep_tg_pt_md_mutex);
 524
 525         spin_lock(&dev->se_port_lock);
 526         if (dev->dev_port_count == 0x0000ffff) {
 527                 printk(KERN_WARNING "Reached dev->dev_port_count =="
 528                                 " 0x0000ffff\n");
 529                 spin_unlock(&dev->se_port_lock);
 530                 return NULL;
 531         }
 532 again:
 533         /*
 534          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 535          * Here is the table from spc4r17 section 7.7.3.8.
 536          *
 537          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 538          *
 539          * Code      Description
 540          * 0h        Reserved
 541          * 1h        Relative port 1, historically known as port A
 542          * 2h        Relative port 2, historically known as port B
 543          * 3h to FFFFh    Relative port 3 through 65 535
 544          */
 545         port->sep_rtpi = dev->dev_rpti_counter++;
 546         if (!(port->sep_rtpi))
 547                 goto again;
 548
 549         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 550                 /*
 551                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 552                  * for 16-bit wrap..
 553                  */
 554                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 555                         goto again;
 556         }
 557         spin_unlock(&dev->se_port_lock);
 558
 559         return port;
 560 }
 561
 562 static void core_export_port(
 563         struct se_device *dev,
 564         struct se_portal_group *tpg,
 565         struct se_port *port,
 566         struct se_lun *lun)
 567 {
 568         struct se_subsystem_dev *su_dev = SU_DEV(dev);
 569         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 570
 571         spin_lock(&dev->se_port_lock);
 572         spin_lock(&lun->lun_sep_lock);
 573         port->sep_tpg = tpg;
 574         port->sep_lun = lun;
 575         lun->lun_sep = port;
 576         spin_unlock(&lun->lun_sep_lock);
 577
 578         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 579         spin_unlock(&dev->se_port_lock);
 580
 581         if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
 582                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 583                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 584                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
 585                                         "_gp_member_t\n");
 586                         return;
 587                 }
 588                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 589                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 590                         T10_ALUA(su_dev)->default_tg_pt_gp);
 591                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 592                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
 593                         " Group: alua/default_tg_pt_gp\n",
 594                         TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
 595         }
 596
 597         dev->dev_port_count++;
 598         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 599 }
 600
 601 /*
 602  *      Called with struct se_device->se_port_lock spinlock held.
 603  */
 604 static void core_release_port(struct se_device *dev, struct se_port *port)
 605         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 606 {
 607         /*
 608          * Wait for any port reference for PR ALL_TG_PT=1 operation
 609          * to complete in __core_scsi3_alloc_registration()
 610          */
 611         spin_unlock(&dev->se_port_lock);
 612         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 613                 cpu_relax();
 614         spin_lock(&dev->se_port_lock);
 615
 616         core_alua_free_tg_pt_gp_mem(port);
 617
 618         list_del(&port->sep_list);
 619         dev->dev_port_count--;
 620         kfree(port);
 621
 622         return;
 623 }
 624
 625 int core_dev_export(
 626         struct se_device *dev,
 627         struct se_portal_group *tpg,
 628         struct se_lun *lun)
 629 {
 630         struct se_port *port;
 631
 632         port = core_alloc_port(dev);
 633         if (!(port))
 634                 return -1;
 635
 636         lun->lun_se_dev = dev;
 637         se_dev_start(dev);
 638
 639         atomic_inc(&dev->dev_export_obj.obj_access_count);
 640         core_export_port(dev, tpg, port, lun);
 641         return 0;
 642 }
 643
 644 void core_dev_unexport(
 645         struct se_device *dev,
 646         struct se_portal_group *tpg,
 647         struct se_lun *lun)
 648 {
 649         struct se_port *port = lun->lun_sep;
 650
 651         spin_lock(&lun->lun_sep_lock);
 652         if (lun->lun_se_dev == NULL) {
 653                 spin_unlock(&lun->lun_sep_lock);
 654                 return;
 655         }
 656         spin_unlock(&lun->lun_sep_lock);
 657
 658         spin_lock(&dev->se_port_lock);
 659         atomic_dec(&dev->dev_export_obj.obj_access_count);
 660         core_release_port(dev, port);
 661         spin_unlock(&dev->se_port_lock);
 662
 663         se_dev_stop(dev);
 664         lun->lun_se_dev = NULL;
 665 }
 666
 667 int transport_core_report_lun_response(struct se_cmd *se_cmd)
 668 {
 669         struct se_dev_entry *deve;
 670         struct se_lun *se_lun;
 671         struct se_session *se_sess = SE_SESS(se_cmd);
 672         struct se_task *se_task;
 673         unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
 674         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 675
 676         list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
 677                 break;
 678
 679         if (!(se_task)) {
 680                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
 681                 return PYX_TRANSPORT_LU_COMM_FAILURE;
 682         }
 683
 684         /*
 685          * If no struct se_session pointer is present, this struct se_cmd is
 686          * coming via a target_core_mod PASSTHROUGH op, and not through
 687          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 688          */
 689         if (!(se_sess)) {
 690                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 691                 lun_count = 1;
 692                 goto done;
 693         }
 694
 695         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 696         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 697                 deve = &SE_NODE_ACL(se_sess)->device_list[i];
 698                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 699                         continue;
 700                 se_lun = deve->se_lun;
 701                 /*
 702                  * We determine the correct LUN LIST LENGTH even once we
 703                  * have reached the initial allocation length.
 704                  * See SPC2-R20 7.19.
 705                  */
 706                 lun_count++;
 707                 if ((cdb_offset + 8) >= se_cmd->data_length)
 708                         continue;
 709
 710                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 711                 offset += 8;
 712                 cdb_offset += 8;
 713         }
 714         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
 715
 716         /*
 717          * See SPC3 r07, page 159.
 718          */
 719 done:
 720         lun_count *= 8;
 721         buf[0] = ((lun_count >> 24) & 0xff);
 722         buf[1] = ((lun_count >> 16) & 0xff);
 723         buf[2] = ((lun_count >> 8) & 0xff);
 724         buf[3] = (lun_count & 0xff);
 725
 726         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 727 }
 728
 729 /*      se_release_device_for_hba():
 730  *
 731  *
 732  */
 733 void se_release_device_for_hba(struct se_device *dev)
 734 {
 735         struct se_hba *hba = dev->se_hba;
 736
 737         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 738             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 739             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 740             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 741             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 742                 se_dev_stop(dev);
 743
 744         if (dev->dev_ptr) {
 745                 kthread_stop(dev->process_thread);
 746                 if (dev->transport->free_device)
 747                         dev->transport->free_device(dev->dev_ptr);
 748         }
 749
 750         spin_lock(&hba->device_lock);
 751         list_del(&dev->dev_list);
 752         hba->dev_count--;
 753         spin_unlock(&hba->device_lock);
 754
 755         core_scsi3_free_all_registrations(dev);
 756         se_release_vpd_for_dev(dev);
 757
 758         kfree(dev->dev_status_queue_obj);
 759         kfree(dev->dev_queue_obj);
 760         kfree(dev);
 761
 762         return;
 763 }
 764
 765 void se_release_vpd_for_dev(struct se_device *dev)
 766 {
 767         struct t10_vpd *vpd, *vpd_tmp;
 768
 769         spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 770         list_for_each_entry_safe(vpd, vpd_tmp,
 771                         &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
 772                 list_del(&vpd->vpd_list);
 773                 kfree(vpd);
 774         }
 775         spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
 776
 777         return;
 778 }
 779
 780 /*      se_free_virtual_device():
 781  *
 782  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 783  */
 784 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 785 {
 786         if (!list_empty(&dev->dev_sep_list))
 787                 dump_stack();
 788
 789         core_alua_free_lu_gp_mem(dev);
 790         se_release_device_for_hba(dev);
 791
 792         return 0;
 793 }
 794
 795 static void se_dev_start(struct se_device *dev)
 796 {
 797         struct se_hba *hba = dev->se_hba;
 798
 799         spin_lock(&hba->device_lock);
 800         atomic_inc(&dev->dev_obj.obj_access_count);
 801         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 802                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 803                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 804                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 805                 } else if (dev->dev_status &
 806                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 807                         dev->dev_status &=
 808                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 809                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 810                 }
 811         }
 812         spin_unlock(&hba->device_lock);
 813 }
 814
 815 static void se_dev_stop(struct se_device *dev)
 816 {
 817         struct se_hba *hba = dev->se_hba;
 818
 819         spin_lock(&hba->device_lock);
 820         atomic_dec(&dev->dev_obj.obj_access_count);
 821         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 822                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 823                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 824                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 825                 } else if (dev->dev_status &
 826                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 827                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 828                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 829                 }
 830         }
 831         spin_unlock(&hba->device_lock);
 832 }
 833
 834 int se_dev_check_online(struct se_device *dev)
 835 {
 836         int ret;
 837
 838         spin_lock_irq(&dev->dev_status_lock);
 839         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 840                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 841         spin_unlock_irq(&dev->dev_status_lock);
 842
 843         return ret;
 844 }
 845
 846 int se_dev_check_shutdown(struct se_device *dev)
 847 {
 848         int ret;
 849
 850         spin_lock_irq(&dev->dev_status_lock);
 851         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 852         spin_unlock_irq(&dev->dev_status_lock);
 853
 854         return ret;
 855 }
 856
 857 void se_dev_set_default_attribs(
 858         struct se_device *dev,
 859         struct se_dev_limits *dev_limits)
 860 {
 861         struct queue_limits *limits = &dev_limits->limits;
 862
 863         DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
 864         DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
 865         DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
 866         DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 867         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 868         DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
 869         DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
 870         DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
 871         DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
 872         DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
 873         DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 874         /*
 875          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 876          * iblock_create_virtdevice() from struct queue_limits values
 877          * if blk_queue_discard()==1
 878          */
 879         DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 880         DEV_ATTRIB(dev)->max_unmap_block_desc_count =
 881                                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 882         DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 883         DEV_ATTRIB(dev)->unmap_granularity_alignment =
 884                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 885         /*
 886          * block_size is based on subsystem plugin dependent requirements.
 887          */
 888         DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
 889         DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
 890         /*
 891          * max_sectors is based on subsystem plugin dependent requirements.
 892          */
 893         DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
 894         DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
 895         /*
 896          * Set optimal_sectors from max_sectors, which can be lowered via
 897          * configfs.
 898          */
 899         DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
 900         /*
 901          * queue_depth is based on subsystem plugin dependent requirements.
 902          */
 903         DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
 904         DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
 905 }
 906
 907 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
 908 {
 909         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
 910                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
 911                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
 912                 return -1;
 913         } else {
 914                 DEV_ATTRIB(dev)->task_timeout = task_timeout;
 915                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
 916                         dev, task_timeout);
 917         }
 918
 919         return 0;
 920 }
 921
 922 int se_dev_set_max_unmap_lba_count(
 923         struct se_device *dev,
 924         u32 max_unmap_lba_count)
 925 {
 926         DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
 927         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
 928                         dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
 929         return 0;
 930 }
 931
 932 int se_dev_set_max_unmap_block_desc_count(
 933         struct se_device *dev,
 934         u32 max_unmap_block_desc_count)
 935 {
 936         DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
 937         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
 938                         dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
 939         return 0;
 940 }
 941
 942 int se_dev_set_unmap_granularity(
 943         struct se_device *dev,
 944         u32 unmap_granularity)
 945 {
 946         DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
 947         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
 948                         dev, DEV_ATTRIB(dev)->unmap_granularity);
 949         return 0;
 950 }
 951
 952 int se_dev_set_unmap_granularity_alignment(
 953         struct se_device *dev,
 954         u32 unmap_granularity_alignment)
 955 {
 956         DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
 957         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
 958                         dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
 959         return 0;
 960 }
 961
 962 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 963 {
 964         if ((flag != 0) && (flag != 1)) {
 965                 printk(KERN_ERR "Illegal value %d\n", flag);
 966                 return -1;
 967         }
 968         if (TRANSPORT(dev)->dpo_emulated == NULL) {
 969                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
 970                 return -1;
 971         }
 972         if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
 973                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
 974                 return -1;
 975         }
 976         DEV_ATTRIB(dev)->emulate_dpo = flag;
 977         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
 978                         " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
 979         return 0;
 980 }
 981
 982 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 983 {
 984         if ((flag != 0) && (flag != 1)) {
 985                 printk(KERN_ERR "Illegal value %d\n", flag);
 986                 return -1;
 987         }
 988         if (TRANSPORT(dev)->fua_write_emulated == NULL) {
 989                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
 990                 return -1;
 991         }
 992         if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
 993                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
 994                 return -1;
 995         }
 996         DEV_ATTRIB(dev)->emulate_fua_write = flag;
 997         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 998                         dev, DEV_ATTRIB(dev)->emulate_fua_write);
 999         return 0;
1000 }
1001
1002 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1003 {
1004         if ((flag != 0) && (flag != 1)) {
1005                 printk(KERN_ERR "Illegal value %d\n", flag);
1006                 return -1;
1007         }
1008         if (TRANSPORT(dev)->fua_read_emulated == NULL) {
1009                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
1010                 return -1;
1011         }
1012         if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1013                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1014                 return -1;
1015         }
1016         DEV_ATTRIB(dev)->emulate_fua_read = flag;
1017         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1018                         dev, DEV_ATTRIB(dev)->emulate_fua_read);
1019         return 0;
1020 }
1021
1022 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1023 {
1024         if ((flag != 0) && (flag != 1)) {
1025                 printk(KERN_ERR "Illegal value %d\n", flag);
1026                 return -1;
1027         }
1028         if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1029                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1030                 return -1;
1031         }
1032         if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1033                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1034                 return -1;
1035         }
1036         DEV_ATTRIB(dev)->emulate_write_cache = flag;
1037         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1038                         dev, DEV_ATTRIB(dev)->emulate_write_cache);
1039         return 0;
1040 }
1041
1042 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1043 {
1044         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1045                 printk(KERN_ERR "Illegal value %d\n", flag);
1046                 return -1;
1047         }
1048
1049         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1050                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1051                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1052                         " exists\n", dev,
1053                         atomic_read(&dev->dev_export_obj.obj_access_count));
1054                 return -1;
1055         }
1056         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1057         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1058                 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1059
1060         return 0;
1061 }
1062
1063 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1064 {
1065         if ((flag != 0) && (flag != 1)) {
1066                 printk(KERN_ERR "Illegal value %d\n", flag);
1067                 return -1;
1068         }
1069
1070         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1071                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1072                         " dev_export_obj: %d count exists\n", dev,
1073                         atomic_read(&dev->dev_export_obj.obj_access_count));
1074                 return -1;
1075         }
1076         DEV_ATTRIB(dev)->emulate_tas = flag;
1077         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1078                 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1079
1080         return 0;
1081 }
1082
1083 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1084 {
1085         if ((flag != 0) && (flag != 1)) {
1086                 printk(KERN_ERR "Illegal value %d\n", flag);
1087                 return -1;
1088         }
1089         /*
1090          * We expect this value to be non-zero when generic Block Layer
1091          * Discard supported is detected iblock_create_virtdevice().
1092          */
1093         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1094                 printk(KERN_ERR "Generic Block Discard not supported\n");
1095                 return -ENOSYS;
1096         }
1097
1098         DEV_ATTRIB(dev)->emulate_tpu = flag;
1099         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1100                                 dev, flag);
1101         return 0;
1102 }
1103
1104 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1105 {
1106         if ((flag != 0) && (flag != 1)) {
1107                 printk(KERN_ERR "Illegal value %d\n", flag);
1108                 return -1;
1109         }
1110         /*
1111          * We expect this value to be non-zero when generic Block Layer
1112          * Discard supported is detected iblock_create_virtdevice().
1113          */
1114         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1115                 printk(KERN_ERR "Generic Block Discard not supported\n");
1116                 return -ENOSYS;
1117         }
1118
1119         DEV_ATTRIB(dev)->emulate_tpws = flag;
1120         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1121                                 dev, flag);
1122         return 0;
1123 }
1124
1125 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1126 {
1127         if ((flag != 0) && (flag != 1)) {
1128                 printk(KERN_ERR "Illegal value %d\n", flag);
1129                 return -1;
1130         }
1131         DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1132         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1133                 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1134         return 0;
1135 }
1136
1137 /*
1138  * Note, this can only be called on unexported SE Device Object.
1139  */
1140 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1141 {
1142         u32 orig_queue_depth = dev->queue_depth;
1143
1144         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1145                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1146                         " dev_export_obj: %d count exists\n", dev,
1147                         atomic_read(&dev->dev_export_obj.obj_access_count));
1148                 return -1;
1149         }
1150         if (!(queue_depth)) {
1151                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1152                         "_depth\n", dev);
1153                 return -1;
1154         }
1155
1156         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1157                 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1158                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1159                                 " exceeds TCM/SE_Device TCQ: %u\n",
1160                                 dev, queue_depth,
1161                                 DEV_ATTRIB(dev)->hw_queue_depth);
1162                         return -1;
1163                 }
1164         } else {
1165                 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1166                         if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1167                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1168                                         " %u exceeds TCM/SE_Device MAX"
1169                                         " TCQ: %u\n", dev, queue_depth,
1170                                         DEV_ATTRIB(dev)->hw_queue_depth);
1171                                 return -1;
1172                         }
1173                 }
1174         }
1175
1176         DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1177         if (queue_depth > orig_queue_depth)
1178                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1179         else if (queue_depth < orig_queue_depth)
1180                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1181
1182         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1183                         dev, queue_depth);
1184         return 0;
1185 }
1186
1187 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1188 {
1189         int force = 0; /* Force setting for VDEVS */
1190
1191         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1192                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1193                         " max_sectors while dev_export_obj: %d count exists\n",
1194                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1195                 return -1;
1196         }
1197         if (!(max_sectors)) {
1198                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1199                         " max_sectors\n", dev);
1200                 return -1;
1201         }
1202         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1203                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1204                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1205                                 DA_STATUS_MAX_SECTORS_MIN);
1206                 return -1;
1207         }
1208         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1209                 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1210                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1211                                 " greater than TCM/SE_Device max_sectors:"
1212                                 " %u\n", dev, max_sectors,
1213                                 DEV_ATTRIB(dev)->hw_max_sectors);
1214                          return -1;
1215                 }
1216         } else {
1217                 if (!(force) && (max_sectors >
1218                                  DEV_ATTRIB(dev)->hw_max_sectors)) {
1219                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1220                                 " greater than TCM/SE_Device max_sectors"
1221                                 ": %u, use force=1 to override.\n", dev,
1222                                 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1223                         return -1;
1224                 }
1225                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1226                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1227                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1228                                 " %u\n", dev, max_sectors,
1229                                 DA_STATUS_MAX_SECTORS_MAX);
1230                         return -1;
1231                 }
1232         }
1233
1234         DEV_ATTRIB(dev)->max_sectors = max_sectors;
1235         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1236                         dev, max_sectors);
1237         return 0;
1238 }
1239
1240 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1241 {
1242         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1243                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1244                         " optimal_sectors while dev_export_obj: %d count exists\n",
1245                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1246                 return -EINVAL;
1247         }
1248         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1249                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1250                                 " changed for TCM/pSCSI\n", dev);
1251                 return -EINVAL;
1252         }
1253         if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1254                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1255                         " greater than max_sectors: %u\n", dev,
1256                         optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1257                 return -EINVAL;
1258         }
1259
1260         DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1261         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1262                         dev, optimal_sectors);
1263         return 0;
1264 }
1265
1266 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1267 {
1268         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1269                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1270                         " while dev_export_obj: %d count exists\n", dev,
1271                         atomic_read(&dev->dev_export_obj.obj_access_count));
1272                 return -1;
1273         }
1274
1275         if ((block_size != 512) &&
1276             (block_size != 1024) &&
1277             (block_size != 2048) &&
1278             (block_size != 4096)) {
1279                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1280                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1281                         dev, block_size);
1282                 return -1;
1283         }
1284
1285         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1286                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1287                         " Physical Device, use for Linux/SCSI to change"
1288                         " block_size for underlying hardware\n", dev);
1289                 return -1;
1290         }
1291
1292         DEV_ATTRIB(dev)->block_size = block_size;
1293         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1294                         dev, block_size);
1295         return 0;
1296 }
1297
1298 struct se_lun *core_dev_add_lun(
1299         struct se_portal_group *tpg,
1300         struct se_hba *hba,
1301         struct se_device *dev,
1302         u32 lun)
1303 {
1304         struct se_lun *lun_p;
1305         u32 lun_access = 0;
1306
1307         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1308                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1309                         atomic_read(&dev->dev_access_obj.obj_access_count));
1310                 return NULL;
1311         }
1312
1313         lun_p = core_tpg_pre_addlun(tpg, lun);
1314         if ((IS_ERR(lun_p)) || !(lun_p))
1315                 return NULL;
1316
1317         if (dev->dev_flags & DF_READ_ONLY)
1318                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1319         else
1320                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1321
1322         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1323                 return NULL;
1324
1325         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1326                 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1327                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1328                 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1329         /*
1330          * Update LUN maps for dynamically added initiators when
1331          * generate_node_acl is enabled.
1332          */
1333         if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1334                 struct se_node_acl *acl;
1335                 spin_lock_bh(&tpg->acl_node_lock);
1336                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1337                         if (acl->dynamic_node_acl) {
1338                                 spin_unlock_bh(&tpg->acl_node_lock);
1339                                 core_tpg_add_node_to_devs(acl, tpg);
1340                                 spin_lock_bh(&tpg->acl_node_lock);
1341                         }
1342                 }
1343                 spin_unlock_bh(&tpg->acl_node_lock);
1344         }
1345
1346         return lun_p;
1347 }
1348
1349 /*      core_dev_del_lun():
1350  *
1351  *
1352  */
1353 int core_dev_del_lun(
1354         struct se_portal_group *tpg,
1355         u32 unpacked_lun)
1356 {
1357         struct se_lun *lun;
1358         int ret = 0;
1359
1360         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1361         if (!(lun))
1362                 return ret;
1363
1364         core_tpg_post_dellun(tpg, lun);
1365
1366         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1367                 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1368                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1369                 TPG_TFO(tpg)->get_fabric_name());
1370
1371         return 0;
1372 }
1373
1374 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1375 {
1376         struct se_lun *lun;
1377
1378         spin_lock(&tpg->tpg_lun_lock);
1379         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1380                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1381                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1382                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1383                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1384                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1385                 spin_unlock(&tpg->tpg_lun_lock);
1386                 return NULL;
1387         }
1388         lun = &tpg->tpg_lun_list[unpacked_lun];
1389
1390         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1391                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1392                         " Target Portal Group: %hu, ignoring request.\n",
1393                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1394                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1395                 spin_unlock(&tpg->tpg_lun_lock);
1396                 return NULL;
1397         }
1398         spin_unlock(&tpg->tpg_lun_lock);
1399
1400         return lun;
1401 }
1402
1403 /*      core_dev_get_lun():
1404  *
1405  *
1406  */
1407 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1408 {
1409         struct se_lun *lun;
1410
1411         spin_lock(&tpg->tpg_lun_lock);
1412         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1413                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1414                         "_TPG-1: %u for Target Portal Group: %hu\n",
1415                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1416                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1417                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1418                 spin_unlock(&tpg->tpg_lun_lock);
1419                 return NULL;
1420         }
1421         lun = &tpg->tpg_lun_list[unpacked_lun];
1422
1423         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1424                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1425                         " Target Portal Group: %hu, ignoring request.\n",
1426                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1427                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1428                 spin_unlock(&tpg->tpg_lun_lock);
1429                 return NULL;
1430         }
1431         spin_unlock(&tpg->tpg_lun_lock);
1432
1433         return lun;
1434 }
1435
1436 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1437         struct se_portal_group *tpg,
1438         u32 mapped_lun,
1439         char *initiatorname,
1440         int *ret)
1441 {
1442         struct se_lun_acl *lacl;
1443         struct se_node_acl *nacl;
1444
1445         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1446                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1447                         TPG_TFO(tpg)->get_fabric_name());
1448                 *ret = -EOVERFLOW;
1449                 return NULL;
1450         }
1451         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1452         if (!(nacl)) {
1453                 *ret = -EINVAL;
1454                 return NULL;
1455         }
1456         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1457         if (!(lacl)) {
1458                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1459                 *ret = -ENOMEM;
1460                 return NULL;
1461         }
1462
1463         INIT_LIST_HEAD(&lacl->lacl_list);
1464         lacl->mapped_lun = mapped_lun;
1465         lacl->se_lun_nacl = nacl;
1466         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1467
1468         return lacl;
1469 }
1470
1471 int core_dev_add_initiator_node_lun_acl(
1472         struct se_portal_group *tpg,
1473         struct se_lun_acl *lacl,
1474         u32 unpacked_lun,
1475         u32 lun_access)
1476 {
1477         struct se_lun *lun;
1478         struct se_node_acl *nacl;
1479
1480         lun = core_dev_get_lun(tpg, unpacked_lun);
1481         if (!(lun)) {
1482                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1483                         " Target Portal Group: %hu, ignoring request.\n",
1484                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1485                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1486                 return -EINVAL;
1487         }
1488
1489         nacl = lacl->se_lun_nacl;
1490         if (!(nacl))
1491                 return -EINVAL;
1492
1493         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1494             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1495                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1496
1497         lacl->se_lun = lun;
1498
1499         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1500                         lun_access, nacl, tpg, 1) < 0)
1501                 return -EINVAL;
1502
1503         spin_lock(&lun->lun_acl_lock);
1504         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1505         atomic_inc(&lun->lun_acl_count);
1506         smp_mb__after_atomic_inc();
1507         spin_unlock(&lun->lun_acl_lock);
1508
1509         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1510                 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1511                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1512                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1513                 lacl->initiatorname);
1514         /*
1515          * Check to see if there are any existing persistent reservation APTPL
1516          * pre-registrations that need to be enabled for this LUN ACL..
1517          */
1518         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1519         return 0;
1520 }
1521
1522 /*      core_dev_del_initiator_node_lun_acl():
1523  *
1524  *
1525  */
1526 int core_dev_del_initiator_node_lun_acl(
1527         struct se_portal_group *tpg,
1528         struct se_lun *lun,
1529         struct se_lun_acl *lacl)
1530 {
1531         struct se_node_acl *nacl;
1532
1533         nacl = lacl->se_lun_nacl;
1534         if (!(nacl))
1535                 return -EINVAL;
1536
1537         spin_lock(&lun->lun_acl_lock);
1538         list_del(&lacl->lacl_list);
1539         atomic_dec(&lun->lun_acl_count);
1540         smp_mb__after_atomic_dec();
1541         spin_unlock(&lun->lun_acl_lock);
1542
1543         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1544                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1545
1546         lacl->se_lun = NULL;
1547
1548         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1549                 " InitiatorNode: %s Mapped LUN: %u\n",
1550                 TPG_TFO(tpg)->get_fabric_name(),
1551                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1552                 lacl->initiatorname, lacl->mapped_lun);
1553
1554         return 0;
1555 }
1556
1557 void core_dev_free_initiator_node_lun_acl(
1558         struct se_portal_group *tpg,
1559         struct se_lun_acl *lacl)
1560 {
1561         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1562                 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1563                 TPG_TFO(tpg)->tpg_get_tag(tpg),
1564                 TPG_TFO(tpg)->get_fabric_name(),
1565                 lacl->initiatorname, lacl->mapped_lun);
1566
1567         kfree(lacl);
1568 }
1569
1570 int core_dev_setup_virtual_lun0(void)
1571 {
1572         struct se_hba *hba;
1573         struct se_device *dev;
1574         struct se_subsystem_dev *se_dev = NULL;
1575         struct se_subsystem_api *t;
1576         char buf[16];
1577         int ret;
1578
1579         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1580         if (IS_ERR(hba))
1581                 return PTR_ERR(hba);
1582
1583         se_global->g_lun0_hba = hba;
1584         t = hba->transport;
1585
1586         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1587         if (!(se_dev)) {
1588                 printk(KERN_ERR "Unable to allocate memory for"
1589                                 " struct se_subsystem_dev\n");
1590                 ret = -ENOMEM;
1591                 goto out;
1592         }
1593         INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1594         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1595         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1596         INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1597         INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1598         spin_lock_init(&se_dev->t10_reservation.registration_lock);
1599         spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1600         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1601         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1602         spin_lock_init(&se_dev->se_dev_lock);
1603         se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1604         se_dev->t10_wwn.t10_sub_dev = se_dev;
1605         se_dev->t10_alua.t10_sub_dev = se_dev;
1606         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1607         se_dev->se_dev_hba = hba;
1608
1609         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1610         if (!(se_dev->se_dev_su_ptr)) {
1611                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1612                         " from allocate_virtdevice()\n");
1613                 ret = -ENOMEM;
1614                 goto out;
1615         }
1616         se_global->g_lun0_su_dev = se_dev;
1617
1618         memset(buf, 0, 16);
1619         sprintf(buf, "rd_pages=8");
1620         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1621
1622         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1623         if (!(dev) || IS_ERR(dev)) {
1624                 ret = -ENOMEM;
1625                 goto out;
1626         }
1627         se_dev->se_dev_ptr = dev;
1628         se_global->g_lun0_dev = dev;
1629
1630         return 0;
1631 out:
1632         se_global->g_lun0_su_dev = NULL;
1633         kfree(se_dev);
1634         if (se_global->g_lun0_hba) {
1635                 core_delete_hba(se_global->g_lun0_hba);
1636                 se_global->g_lun0_hba = NULL;
1637         }
1638         return ret;
1639 }
1640
1641
1642 void core_dev_release_virtual_lun0(void)
1643 {
1644         struct se_hba *hba = se_global->g_lun0_hba;
1645         struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1646
1647         if (!(hba))
1648                 return;
1649
1650         if (se_global->g_lun0_dev)
1651                 se_free_virtual_device(se_global->g_lun0_dev, hba);
1652
1653         kfree(su_dev);
1654         core_delete_hba(hba);
1655 }