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