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 <linux/export.h>
  39 #include <net/sock.h>
  40 #include <net/tcp.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_device.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_device.h>
  46 #include <target/target_core_tpg.h>
  47 #include <target/target_core_transport.h>
  48 #include <target/target_core_fabric_ops.h>
  49
  50 #include "target_core_alua.h"
  51 #include "target_core_hba.h"
  52 #include "target_core_pr.h"
  53 #include "target_core_ua.h"
  54
  55 static void se_dev_start(struct se_device *dev);
  56 static void se_dev_stop(struct se_device *dev);
  57
  58 static struct se_hba *lun0_hba;
  59 static struct se_subsystem_dev *lun0_su_dev;
  60 /* not static, needed by tpg.c */
  61 struct se_device *g_lun0_dev;
  62
  63 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  64 {
  65         struct se_lun *se_lun = NULL;
  66         struct se_session *se_sess = se_cmd->se_sess;
  67         struct se_device *dev;
  68         unsigned long flags;
  69
  70         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  71                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  72                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  73                 return -ENODEV;
  74         }
  75
  76         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  77         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
  78         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  79                 struct se_dev_entry *deve = se_cmd->se_deve;
  80
  81                 deve->total_cmds++;
  82                 deve->total_bytes += se_cmd->data_length;
  83
  84                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  85                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  86                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  87                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  88                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  89                                 " Access for 0x%08x\n",
  90                                 se_cmd->se_tfo->get_fabric_name(),
  91                                 unpacked_lun);
  92                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  93                         return -EACCES;
  94                 }
  95
  96                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  97                         deve->write_bytes += se_cmd->data_length;
  98                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  99                         deve->read_bytes += se_cmd->data_length;
 100
 101                 deve->deve_cmds++;
 102
 103                 se_lun = deve->se_lun;
 104                 se_cmd->se_lun = deve->se_lun;
 105                 se_cmd->pr_res_key = deve->pr_res_key;
 106                 se_cmd->orig_fe_lun = unpacked_lun;
 107                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
 108                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 109         }
 110         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 111
 112         if (!se_lun) {
 113                 /*
 114                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 115                  * REPORT_LUNS, et al to be returned when no active
 116                  * MappedLUN=0 exists for this Initiator Port.
 117                  */
 118                 if (unpacked_lun != 0) {
 119                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 120                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 121                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 122                                 " Access for 0x%08x\n",
 123                                 se_cmd->se_tfo->get_fabric_name(),
 124                                 unpacked_lun);
 125                         return -ENODEV;
 126                 }
 127                 /*
 128                  * Force WRITE PROTECT for virtual LUN 0
 129                  */
 130                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 131                     (se_cmd->data_direction != DMA_NONE)) {
 132                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 133                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 134                         return -EACCES;
 135                 }
 136
 137                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 138                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 139                 se_cmd->orig_fe_lun = 0;
 140                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
 141                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 142         }
 143         /*
 144          * Determine if the struct se_lun is online.
 145          * FIXME: Check for LUN_RESET + UNIT Attention
 146          */
 147         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 148                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 149                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 150                 return -ENODEV;
 151         }
 152
 153         /* Directly associate cmd with se_dev */
 154         se_cmd->se_dev = se_lun->lun_se_dev;
 155
 156         /* TODO: get rid of this and use atomics for stats */
 157         dev = se_lun->lun_se_dev;
 158         spin_lock_irqsave(&dev->stats_lock, flags);
 159         dev->num_cmds++;
 160         if (se_cmd->data_direction == DMA_TO_DEVICE)
 161                 dev->write_bytes += se_cmd->data_length;
 162         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 163                 dev->read_bytes += se_cmd->data_length;
 164         spin_unlock_irqrestore(&dev->stats_lock, flags);
 165
 166         /*
 167          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
 168          * for tracking state of struct se_cmds during LUN shutdown events.
 169          */
 170         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 171         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 172         atomic_set(&se_cmd->transport_lun_active, 1);
 173         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 174
 175         return 0;
 176 }
 177 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 178
 179 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 180 {
 181         struct se_dev_entry *deve;
 182         struct se_lun *se_lun = NULL;
 183         struct se_session *se_sess = se_cmd->se_sess;
 184         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 185         unsigned long flags;
 186
 187         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 188                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 189                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 190                 return -ENODEV;
 191         }
 192
 193         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 194         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
 195         deve = se_cmd->se_deve;
 196
 197         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 198                 se_tmr->tmr_lun = deve->se_lun;
 199                 se_cmd->se_lun = deve->se_lun;
 200                 se_lun = deve->se_lun;
 201                 se_cmd->pr_res_key = deve->pr_res_key;
 202                 se_cmd->orig_fe_lun = unpacked_lun;
 203                 se_cmd->se_orig_obj_ptr = se_cmd->se_dev;
 204         }
 205         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 206
 207         if (!se_lun) {
 208                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 209                         " Access for 0x%08x\n",
 210                         se_cmd->se_tfo->get_fabric_name(),
 211                         unpacked_lun);
 212                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 213                 return -ENODEV;
 214         }
 215         /*
 216          * Determine if the struct se_lun is online.
 217          * FIXME: Check for LUN_RESET + UNIT Attention
 218          */
 219         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 220                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 221                 return -ENODEV;
 222         }
 223
 224         /* Directly associate cmd with se_dev */
 225         se_cmd->se_dev = se_lun->lun_se_dev;
 226         se_tmr->tmr_dev = se_lun->lun_se_dev;
 227
 228         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 229         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 230         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 231
 232         return 0;
 233 }
 234 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 235
 236 /*
 237  * This function is called from core_scsi3_emulate_pro_register_and_move()
 238  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 239  * when a matching rtpi is found.
 240  */
 241 struct se_dev_entry *core_get_se_deve_from_rtpi(
 242         struct se_node_acl *nacl,
 243         u16 rtpi)
 244 {
 245         struct se_dev_entry *deve;
 246         struct se_lun *lun;
 247         struct se_port *port;
 248         struct se_portal_group *tpg = nacl->se_tpg;
 249         u32 i;
 250
 251         spin_lock_irq(&nacl->device_list_lock);
 252         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 253                 deve = &nacl->device_list[i];
 254
 255                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 256                         continue;
 257
 258                 lun = deve->se_lun;
 259                 if (!lun) {
 260                         pr_err("%s device entries device pointer is"
 261                                 " NULL, but Initiator has access.\n",
 262                                 tpg->se_tpg_tfo->get_fabric_name());
 263                         continue;
 264                 }
 265                 port = lun->lun_sep;
 266                 if (!port) {
 267                         pr_err("%s device entries device pointer is"
 268                                 " NULL, but Initiator has access.\n",
 269                                 tpg->se_tpg_tfo->get_fabric_name());
 270                         continue;
 271                 }
 272                 if (port->sep_rtpi != rtpi)
 273                         continue;
 274
 275                 atomic_inc(&deve->pr_ref_count);
 276                 smp_mb__after_atomic_inc();
 277                 spin_unlock_irq(&nacl->device_list_lock);
 278
 279                 return deve;
 280         }
 281         spin_unlock_irq(&nacl->device_list_lock);
 282
 283         return NULL;
 284 }
 285
 286 int core_free_device_list_for_node(
 287         struct se_node_acl *nacl,
 288         struct se_portal_group *tpg)
 289 {
 290         struct se_dev_entry *deve;
 291         struct se_lun *lun;
 292         u32 i;
 293
 294         if (!nacl->device_list)
 295                 return 0;
 296
 297         spin_lock_irq(&nacl->device_list_lock);
 298         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 299                 deve = &nacl->device_list[i];
 300
 301                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 302                         continue;
 303
 304                 if (!deve->se_lun) {
 305                         pr_err("%s device entries device pointer is"
 306                                 " NULL, but Initiator has access.\n",
 307                                 tpg->se_tpg_tfo->get_fabric_name());
 308                         continue;
 309                 }
 310                 lun = deve->se_lun;
 311
 312                 spin_unlock_irq(&nacl->device_list_lock);
 313                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 314                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 315                 spin_lock_irq(&nacl->device_list_lock);
 316         }
 317         spin_unlock_irq(&nacl->device_list_lock);
 318
 319         kfree(nacl->device_list);
 320         nacl->device_list = NULL;
 321
 322         return 0;
 323 }
 324
 325 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 326 {
 327         struct se_dev_entry *deve;
 328
 329         spin_lock_irq(&se_nacl->device_list_lock);
 330         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
 331         deve->deve_cmds--;
 332         spin_unlock_irq(&se_nacl->device_list_lock);
 333 }
 334
 335 void core_update_device_list_access(
 336         u32 mapped_lun,
 337         u32 lun_access,
 338         struct se_node_acl *nacl)
 339 {
 340         struct se_dev_entry *deve;
 341
 342         spin_lock_irq(&nacl->device_list_lock);
 343         deve = &nacl->device_list[mapped_lun];
 344         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 345                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 346                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 347         } else {
 348                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 349                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 350         }
 351         spin_unlock_irq(&nacl->device_list_lock);
 352 }
 353
 354 /*      core_update_device_list_for_node():
 355  *
 356  *
 357  */
 358 int core_update_device_list_for_node(
 359         struct se_lun *lun,
 360         struct se_lun_acl *lun_acl,
 361         u32 mapped_lun,
 362         u32 lun_access,
 363         struct se_node_acl *nacl,
 364         struct se_portal_group *tpg,
 365         int enable)
 366 {
 367         struct se_port *port = lun->lun_sep;
 368         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
 369         int trans = 0;
 370         /*
 371          * If the MappedLUN entry is being disabled, the entry in
 372          * port->sep_alua_list must be removed now before clearing the
 373          * struct se_dev_entry pointers below as logic in
 374          * core_alua_do_transition_tg_pt() depends on these being present.
 375          */
 376         if (!enable) {
 377                 /*
 378                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 379                  * that have not been explicitly concerted to MappedLUNs ->
 380                  * struct se_lun_acl, but we remove deve->alua_port_list from
 381                  * port->sep_alua_list. This also means that active UAs and
 382                  * NodeACL context specific PR metadata for demo-mode
 383                  * MappedLUN *deve will be released below..
 384                  */
 385                 spin_lock_bh(&port->sep_alua_lock);
 386                 list_del(&deve->alua_port_list);
 387                 spin_unlock_bh(&port->sep_alua_lock);
 388         }
 389
 390         spin_lock_irq(&nacl->device_list_lock);
 391         if (enable) {
 392                 /*
 393                  * Check if the call is handling demo mode -> explict LUN ACL
 394                  * transition.  This transition must be for the same struct se_lun
 395                  * + mapped_lun that was setup in demo mode..
 396                  */
 397                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 398                         if (deve->se_lun_acl != NULL) {
 399                                 pr_err("struct se_dev_entry->se_lun_acl"
 400                                         " already set for demo mode -> explict"
 401                                         " LUN ACL transition\n");
 402                                 spin_unlock_irq(&nacl->device_list_lock);
 403                                 return -EINVAL;
 404                         }
 405                         if (deve->se_lun != lun) {
 406                                 pr_err("struct se_dev_entry->se_lun does"
 407                                         " match passed struct se_lun for demo mode"
 408                                         " -> explict LUN ACL transition\n");
 409                                 spin_unlock_irq(&nacl->device_list_lock);
 410                                 return -EINVAL;
 411                         }
 412                         deve->se_lun_acl = lun_acl;
 413                         trans = 1;
 414                 } else {
 415                         deve->se_lun = lun;
 416                         deve->se_lun_acl = lun_acl;
 417                         deve->mapped_lun = mapped_lun;
 418                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 419                 }
 420
 421                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 422                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 423                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 424                 } else {
 425                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 426                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 427                 }
 428
 429                 if (trans) {
 430                         spin_unlock_irq(&nacl->device_list_lock);
 431                         return 0;
 432                 }
 433                 deve->creation_time = get_jiffies_64();
 434                 deve->attach_count++;
 435                 spin_unlock_irq(&nacl->device_list_lock);
 436
 437                 spin_lock_bh(&port->sep_alua_lock);
 438                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 439                 spin_unlock_bh(&port->sep_alua_lock);
 440
 441                 return 0;
 442         }
 443         /*
 444          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 445          * PR operation to complete.
 446          */
 447         spin_unlock_irq(&nacl->device_list_lock);
 448         while (atomic_read(&deve->pr_ref_count) != 0)
 449                 cpu_relax();
 450         spin_lock_irq(&nacl->device_list_lock);
 451         /*
 452          * Disable struct se_dev_entry LUN ACL mapping
 453          */
 454         core_scsi3_ua_release_all(deve);
 455         deve->se_lun = NULL;
 456         deve->se_lun_acl = NULL;
 457         deve->lun_flags = 0;
 458         deve->creation_time = 0;
 459         deve->attach_count--;
 460         spin_unlock_irq(&nacl->device_list_lock);
 461
 462         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 463         return 0;
 464 }
 465
 466 /*      core_clear_lun_from_tpg():
 467  *
 468  *
 469  */
 470 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 471 {
 472         struct se_node_acl *nacl;
 473         struct se_dev_entry *deve;
 474         u32 i;
 475
 476         spin_lock_irq(&tpg->acl_node_lock);
 477         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 478                 spin_unlock_irq(&tpg->acl_node_lock);
 479
 480                 spin_lock_irq(&nacl->device_list_lock);
 481                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 482                         deve = &nacl->device_list[i];
 483                         if (lun != deve->se_lun)
 484                                 continue;
 485                         spin_unlock_irq(&nacl->device_list_lock);
 486
 487                         core_update_device_list_for_node(lun, NULL,
 488                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 489                                 nacl, tpg, 0);
 490
 491                         spin_lock_irq(&nacl->device_list_lock);
 492                 }
 493                 spin_unlock_irq(&nacl->device_list_lock);
 494
 495                 spin_lock_irq(&tpg->acl_node_lock);
 496         }
 497         spin_unlock_irq(&tpg->acl_node_lock);
 498 }
 499
 500 static struct se_port *core_alloc_port(struct se_device *dev)
 501 {
 502         struct se_port *port, *port_tmp;
 503
 504         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 505         if (!port) {
 506                 pr_err("Unable to allocate struct se_port\n");
 507                 return ERR_PTR(-ENOMEM);
 508         }
 509         INIT_LIST_HEAD(&port->sep_alua_list);
 510         INIT_LIST_HEAD(&port->sep_list);
 511         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 512         spin_lock_init(&port->sep_alua_lock);
 513         mutex_init(&port->sep_tg_pt_md_mutex);
 514
 515         spin_lock(&dev->se_port_lock);
 516         if (dev->dev_port_count == 0x0000ffff) {
 517                 pr_warn("Reached dev->dev_port_count =="
 518                                 " 0x0000ffff\n");
 519                 spin_unlock(&dev->se_port_lock);
 520                 return ERR_PTR(-ENOSPC);
 521         }
 522 again:
 523         /*
 524          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 525          * Here is the table from spc4r17 section 7.7.3.8.
 526          *
 527          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 528          *
 529          * Code      Description
 530          * 0h        Reserved
 531          * 1h        Relative port 1, historically known as port A
 532          * 2h        Relative port 2, historically known as port B
 533          * 3h to FFFFh    Relative port 3 through 65 535
 534          */
 535         port->sep_rtpi = dev->dev_rpti_counter++;
 536         if (!port->sep_rtpi)
 537                 goto again;
 538
 539         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 540                 /*
 541                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 542                  * for 16-bit wrap..
 543                  */
 544                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 545                         goto again;
 546         }
 547         spin_unlock(&dev->se_port_lock);
 548
 549         return port;
 550 }
 551
 552 static void core_export_port(
 553         struct se_device *dev,
 554         struct se_portal_group *tpg,
 555         struct se_port *port,
 556         struct se_lun *lun)
 557 {
 558         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 559         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 560
 561         spin_lock(&dev->se_port_lock);
 562         spin_lock(&lun->lun_sep_lock);
 563         port->sep_tpg = tpg;
 564         port->sep_lun = lun;
 565         lun->lun_sep = port;
 566         spin_unlock(&lun->lun_sep_lock);
 567
 568         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 569         spin_unlock(&dev->se_port_lock);
 570
 571         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 572                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 573                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 574                         pr_err("Unable to allocate t10_alua_tg_pt"
 575                                         "_gp_member_t\n");
 576                         return;
 577                 }
 578                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 579                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 580                         su_dev->t10_alua.default_tg_pt_gp);
 581                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 582                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 583                         " Group: alua/default_tg_pt_gp\n",
 584                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 585         }
 586
 587         dev->dev_port_count++;
 588         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 589 }
 590
 591 /*
 592  *      Called with struct se_device->se_port_lock spinlock held.
 593  */
 594 static void core_release_port(struct se_device *dev, struct se_port *port)
 595         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 596 {
 597         /*
 598          * Wait for any port reference for PR ALL_TG_PT=1 operation
 599          * to complete in __core_scsi3_alloc_registration()
 600          */
 601         spin_unlock(&dev->se_port_lock);
 602         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 603                 cpu_relax();
 604         spin_lock(&dev->se_port_lock);
 605
 606         core_alua_free_tg_pt_gp_mem(port);
 607
 608         list_del(&port->sep_list);
 609         dev->dev_port_count--;
 610         kfree(port);
 611 }
 612
 613 int core_dev_export(
 614         struct se_device *dev,
 615         struct se_portal_group *tpg,
 616         struct se_lun *lun)
 617 {
 618         struct se_port *port;
 619
 620         port = core_alloc_port(dev);
 621         if (IS_ERR(port))
 622                 return PTR_ERR(port);
 623
 624         lun->lun_se_dev = dev;
 625         se_dev_start(dev);
 626
 627         atomic_inc(&dev->dev_export_obj.obj_access_count);
 628         core_export_port(dev, tpg, port, lun);
 629         return 0;
 630 }
 631
 632 void core_dev_unexport(
 633         struct se_device *dev,
 634         struct se_portal_group *tpg,
 635         struct se_lun *lun)
 636 {
 637         struct se_port *port = lun->lun_sep;
 638
 639         spin_lock(&lun->lun_sep_lock);
 640         if (lun->lun_se_dev == NULL) {
 641                 spin_unlock(&lun->lun_sep_lock);
 642                 return;
 643         }
 644         spin_unlock(&lun->lun_sep_lock);
 645
 646         spin_lock(&dev->se_port_lock);
 647         atomic_dec(&dev->dev_export_obj.obj_access_count);
 648         core_release_port(dev, port);
 649         spin_unlock(&dev->se_port_lock);
 650
 651         se_dev_stop(dev);
 652         lun->lun_se_dev = NULL;
 653 }
 654
 655 int target_report_luns(struct se_task *se_task)
 656 {
 657         struct se_cmd *se_cmd = se_task->task_se_cmd;
 658         struct se_dev_entry *deve;
 659         struct se_lun *se_lun;
 660         struct se_session *se_sess = se_cmd->se_sess;
 661         unsigned char *buf;
 662         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
 663
 664         buf = transport_kmap_first_data_page(se_cmd);
 665
 666         /*
 667          * If no struct se_session pointer is present, this struct se_cmd is
 668          * coming via a target_core_mod PASSTHROUGH op, and not through
 669          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 670          */
 671         if (!se_sess) {
 672                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 673                 lun_count = 1;
 674                 goto done;
 675         }
 676
 677         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 678         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 679                 deve = &se_sess->se_node_acl->device_list[i];
 680                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 681                         continue;
 682                 se_lun = deve->se_lun;
 683                 /*
 684                  * We determine the correct LUN LIST LENGTH even once we
 685                  * have reached the initial allocation length.
 686                  * See SPC2-R20 7.19.
 687                  */
 688                 lun_count++;
 689                 if ((cdb_offset + 8) >= se_cmd->data_length)
 690                         continue;
 691
 692                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 693                 offset += 8;
 694                 cdb_offset += 8;
 695         }
 696         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 697
 698         /*
 699          * See SPC3 r07, page 159.
 700          */
 701 done:
 702         transport_kunmap_first_data_page(se_cmd);
 703         lun_count *= 8;
 704         buf[0] = ((lun_count >> 24) & 0xff);
 705         buf[1] = ((lun_count >> 16) & 0xff);
 706         buf[2] = ((lun_count >> 8) & 0xff);
 707         buf[3] = (lun_count & 0xff);
 708
 709         se_task->task_scsi_status = GOOD;
 710         transport_complete_task(se_task, 1);
 711         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 712 }
 713
 714 /*      se_release_device_for_hba():
 715  *
 716  *
 717  */
 718 void se_release_device_for_hba(struct se_device *dev)
 719 {
 720         struct se_hba *hba = dev->se_hba;
 721
 722         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 723             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 724             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 725             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 726             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 727                 se_dev_stop(dev);
 728
 729         if (dev->dev_ptr) {
 730                 kthread_stop(dev->process_thread);
 731                 if (dev->transport->free_device)
 732                         dev->transport->free_device(dev->dev_ptr);
 733         }
 734
 735         spin_lock(&hba->device_lock);
 736         list_del(&dev->dev_list);
 737         hba->dev_count--;
 738         spin_unlock(&hba->device_lock);
 739
 740         core_scsi3_free_all_registrations(dev);
 741         se_release_vpd_for_dev(dev);
 742
 743         kfree(dev);
 744 }
 745
 746 void se_release_vpd_for_dev(struct se_device *dev)
 747 {
 748         struct t10_vpd *vpd, *vpd_tmp;
 749
 750         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 751         list_for_each_entry_safe(vpd, vpd_tmp,
 752                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 753                 list_del(&vpd->vpd_list);
 754                 kfree(vpd);
 755         }
 756         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 757 }
 758
 759 /*      se_free_virtual_device():
 760  *
 761  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 762  */
 763 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 764 {
 765         if (!list_empty(&dev->dev_sep_list))
 766                 dump_stack();
 767
 768         core_alua_free_lu_gp_mem(dev);
 769         se_release_device_for_hba(dev);
 770
 771         return 0;
 772 }
 773
 774 static void se_dev_start(struct se_device *dev)
 775 {
 776         struct se_hba *hba = dev->se_hba;
 777
 778         spin_lock(&hba->device_lock);
 779         atomic_inc(&dev->dev_obj.obj_access_count);
 780         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 781                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 782                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 783                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 784                 } else if (dev->dev_status &
 785                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 786                         dev->dev_status &=
 787                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 788                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 789                 }
 790         }
 791         spin_unlock(&hba->device_lock);
 792 }
 793
 794 static void se_dev_stop(struct se_device *dev)
 795 {
 796         struct se_hba *hba = dev->se_hba;
 797
 798         spin_lock(&hba->device_lock);
 799         atomic_dec(&dev->dev_obj.obj_access_count);
 800         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 801                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 802                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 803                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 804                 } else if (dev->dev_status &
 805                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 806                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 807                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 808                 }
 809         }
 810         spin_unlock(&hba->device_lock);
 811 }
 812
 813 int se_dev_check_online(struct se_device *dev)
 814 {
 815         unsigned long flags;
 816         int ret;
 817
 818         spin_lock_irqsave(&dev->dev_status_lock, flags);
 819         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 820                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 821         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 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 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 838 {
 839         u32 tmp, aligned_max_sectors;
 840         /*
 841          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 842          * transport_allocate_data_tasks() operation.
 843          */
 844         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 845         aligned_max_sectors = (tmp / block_size);
 846         if (max_sectors != aligned_max_sectors) {
 847                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 848                                 " to %u\n", max_sectors, aligned_max_sectors);
 849                 return aligned_max_sectors;
 850         }
 851
 852         return max_sectors;
 853 }
 854
 855 void se_dev_set_default_attribs(
 856         struct se_device *dev,
 857         struct se_dev_limits *dev_limits)
 858 {
 859         struct queue_limits *limits = &dev_limits->limits;
 860
 861         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 862         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 863         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 864         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 865         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 866         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 867         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 868         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 869         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 870         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 871         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 872         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 873         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 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->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 880         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 881                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 882         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 883         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 884                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 885         /*
 886          * block_size is based on subsystem plugin dependent requirements.
 887          */
 888         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 889         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 890         /*
 891          * max_sectors is based on subsystem plugin dependent requirements.
 892          */
 893         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 894         /*
 895          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
 896          */
 897         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
 898                                                 limits->logical_block_size);
 899         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 900         /*
 901          * Set optimal_sectors from max_sectors, which can be lowered via
 902          * configfs.
 903          */
 904         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
 905         /*
 906          * queue_depth is based on subsystem plugin dependent requirements.
 907          */
 908         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 909         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 910 }
 911
 912 int se_dev_set_max_unmap_lba_count(
 913         struct se_device *dev,
 914         u32 max_unmap_lba_count)
 915 {
 916         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 917         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 918                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 919         return 0;
 920 }
 921
 922 int se_dev_set_max_unmap_block_desc_count(
 923         struct se_device *dev,
 924         u32 max_unmap_block_desc_count)
 925 {
 926         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 927                 max_unmap_block_desc_count;
 928         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 929                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 930         return 0;
 931 }
 932
 933 int se_dev_set_unmap_granularity(
 934         struct se_device *dev,
 935         u32 unmap_granularity)
 936 {
 937         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 938         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 939                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 940         return 0;
 941 }
 942
 943 int se_dev_set_unmap_granularity_alignment(
 944         struct se_device *dev,
 945         u32 unmap_granularity_alignment)
 946 {
 947         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 948         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 949                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 950         return 0;
 951 }
 952
 953 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 954 {
 955         if (flag != 0 && flag != 1) {
 956                 pr_err("Illegal value %d\n", flag);
 957                 return -EINVAL;
 958         }
 959
 960         pr_err("dpo_emulated not supported\n");
 961         return -EINVAL;
 962 }
 963
 964 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 965 {
 966         if (flag != 0 && flag != 1) {
 967                 pr_err("Illegal value %d\n", flag);
 968                 return -EINVAL;
 969         }
 970
 971         if (dev->transport->fua_write_emulated == 0) {
 972                 pr_err("fua_write_emulated not supported\n");
 973                 return -EINVAL;
 974         }
 975         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 976         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 977                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 978         return 0;
 979 }
 980
 981 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 982 {
 983         if (flag != 0 && flag != 1) {
 984                 pr_err("Illegal value %d\n", flag);
 985                 return -EINVAL;
 986         }
 987
 988         pr_err("ua read emulated not supported\n");
 989         return -EINVAL;
 990 }
 991
 992 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 993 {
 994         if (flag != 0 && flag != 1) {
 995                 pr_err("Illegal value %d\n", flag);
 996                 return -EINVAL;
 997         }
 998         if (dev->transport->write_cache_emulated == 0) {
 999                 pr_err("write_cache_emulated not supported\n");
1000                 return -EINVAL;
1001         }
1002         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1003         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1004                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1005         return 0;
1006 }
1007
1008 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1009 {
1010         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1011                 pr_err("Illegal value %d\n", flag);
1012                 return -EINVAL;
1013         }
1014
1015         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1016                 pr_err("dev[%p]: Unable to change SE Device"
1017                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1018                         " exists\n", dev,
1019                         atomic_read(&dev->dev_export_obj.obj_access_count));
1020                 return -EINVAL;
1021         }
1022         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1023         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1024                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1025
1026         return 0;
1027 }
1028
1029 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1030 {
1031         if ((flag != 0) && (flag != 1)) {
1032                 pr_err("Illegal value %d\n", flag);
1033                 return -EINVAL;
1034         }
1035
1036         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1037                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1038                         " dev_export_obj: %d count exists\n", dev,
1039                         atomic_read(&dev->dev_export_obj.obj_access_count));
1040                 return -EINVAL;
1041         }
1042         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1043         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1044                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1045
1046         return 0;
1047 }
1048
1049 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1050 {
1051         if ((flag != 0) && (flag != 1)) {
1052                 pr_err("Illegal value %d\n", flag);
1053                 return -EINVAL;
1054         }
1055         /*
1056          * We expect this value to be non-zero when generic Block Layer
1057          * Discard supported is detected iblock_create_virtdevice().
1058          */
1059         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1060                 pr_err("Generic Block Discard not supported\n");
1061                 return -ENOSYS;
1062         }
1063
1064         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1065         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1066                                 dev, flag);
1067         return 0;
1068 }
1069
1070 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1071 {
1072         if ((flag != 0) && (flag != 1)) {
1073                 pr_err("Illegal value %d\n", flag);
1074                 return -EINVAL;
1075         }
1076         /*
1077          * We expect this value to be non-zero when generic Block Layer
1078          * Discard supported is detected iblock_create_virtdevice().
1079          */
1080         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1081                 pr_err("Generic Block Discard not supported\n");
1082                 return -ENOSYS;
1083         }
1084
1085         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1086         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1087                                 dev, flag);
1088         return 0;
1089 }
1090
1091 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1092 {
1093         if ((flag != 0) && (flag != 1)) {
1094                 pr_err("Illegal value %d\n", flag);
1095                 return -EINVAL;
1096         }
1097         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1098         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1099                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1100         return 0;
1101 }
1102
1103 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1104 {
1105         if ((flag != 0) && (flag != 1)) {
1106                 printk(KERN_ERR "Illegal value %d\n", flag);
1107                 return -EINVAL;
1108         }
1109         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1110         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1111                dev, flag);
1112         return 0;
1113 }
1114
1115 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1116 {
1117         if (flag != 0) {
1118                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1119                         " reordering not implemented\n", dev);
1120                 return -ENOSYS;
1121         }
1122         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1123         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1124         return 0;
1125 }
1126
1127 /*
1128  * Note, this can only be called on unexported SE Device Object.
1129  */
1130 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1131 {
1132         u32 orig_queue_depth = dev->queue_depth;
1133
1134         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1135                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1136                         " dev_export_obj: %d count exists\n", dev,
1137                         atomic_read(&dev->dev_export_obj.obj_access_count));
1138                 return -EINVAL;
1139         }
1140         if (!queue_depth) {
1141                 pr_err("dev[%p]: Illegal ZERO value for queue"
1142                         "_depth\n", dev);
1143                 return -EINVAL;
1144         }
1145
1146         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1147                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1148                         pr_err("dev[%p]: Passed queue_depth: %u"
1149                                 " exceeds TCM/SE_Device TCQ: %u\n",
1150                                 dev, queue_depth,
1151                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1152                         return -EINVAL;
1153                 }
1154         } else {
1155                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1156                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1157                                 pr_err("dev[%p]: Passed queue_depth:"
1158                                         " %u exceeds TCM/SE_Device MAX"
1159                                         " TCQ: %u\n", dev, queue_depth,
1160                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1161                                 return -EINVAL;
1162                         }
1163                 }
1164         }
1165
1166         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1167         if (queue_depth > orig_queue_depth)
1168                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1169         else if (queue_depth < orig_queue_depth)
1170                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1171
1172         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1173                         dev, queue_depth);
1174         return 0;
1175 }
1176
1177 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1178 {
1179         int force = 0; /* Force setting for VDEVS */
1180
1181         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1182                 pr_err("dev[%p]: Unable to change SE Device"
1183                         " max_sectors while dev_export_obj: %d count exists\n",
1184                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1185                 return -EINVAL;
1186         }
1187         if (!max_sectors) {
1188                 pr_err("dev[%p]: Illegal ZERO value for"
1189                         " max_sectors\n", dev);
1190                 return -EINVAL;
1191         }
1192         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1193                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1194                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1195                                 DA_STATUS_MAX_SECTORS_MIN);
1196                 return -EINVAL;
1197         }
1198         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1199                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1200                         pr_err("dev[%p]: Passed max_sectors: %u"
1201                                 " greater than TCM/SE_Device max_sectors:"
1202                                 " %u\n", dev, max_sectors,
1203                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1204                          return -EINVAL;
1205                 }
1206         } else {
1207                 if (!force && (max_sectors >
1208                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1209                         pr_err("dev[%p]: Passed max_sectors: %u"
1210                                 " greater than TCM/SE_Device max_sectors"
1211                                 ": %u, use force=1 to override.\n", dev,
1212                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1213                         return -EINVAL;
1214                 }
1215                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1216                         pr_err("dev[%p]: Passed max_sectors: %u"
1217                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1218                                 " %u\n", dev, max_sectors,
1219                                 DA_STATUS_MAX_SECTORS_MAX);
1220                         return -EINVAL;
1221                 }
1222         }
1223         /*
1224          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1225          */
1226         max_sectors = se_dev_align_max_sectors(max_sectors,
1227                                 dev->se_sub_dev->se_dev_attrib.block_size);
1228
1229         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1230         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1231                         dev, max_sectors);
1232         return 0;
1233 }
1234
1235 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1236 {
1237         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1238                 pr_err("dev[%p]: Unable to change SE Device"
1239                         " optimal_sectors while dev_export_obj: %d count exists\n",
1240                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1241                 return -EINVAL;
1242         }
1243         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1244                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1245                                 " changed for TCM/pSCSI\n", dev);
1246                 return -EINVAL;
1247         }
1248         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1249                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1250                         " greater than max_sectors: %u\n", dev,
1251                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1252                 return -EINVAL;
1253         }
1254
1255         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1256         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1257                         dev, optimal_sectors);
1258         return 0;
1259 }
1260
1261 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1262 {
1263         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1264                 pr_err("dev[%p]: Unable to change SE Device block_size"
1265                         " while dev_export_obj: %d count exists\n", dev,
1266                         atomic_read(&dev->dev_export_obj.obj_access_count));
1267                 return -EINVAL;
1268         }
1269
1270         if ((block_size != 512) &&
1271             (block_size != 1024) &&
1272             (block_size != 2048) &&
1273             (block_size != 4096)) {
1274                 pr_err("dev[%p]: Illegal value for block_device: %u"
1275                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1276                         dev, block_size);
1277                 return -EINVAL;
1278         }
1279
1280         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1281                 pr_err("dev[%p]: Not allowed to change block_size for"
1282                         " Physical Device, use for Linux/SCSI to change"
1283                         " block_size for underlying hardware\n", dev);
1284                 return -EINVAL;
1285         }
1286
1287         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1288         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1289                         dev, block_size);
1290         return 0;
1291 }
1292
1293 struct se_lun *core_dev_add_lun(
1294         struct se_portal_group *tpg,
1295         struct se_hba *hba,
1296         struct se_device *dev,
1297         u32 lun)
1298 {
1299         struct se_lun *lun_p;
1300         u32 lun_access = 0;
1301
1302         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1303                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1304                         atomic_read(&dev->dev_access_obj.obj_access_count));
1305                 return NULL;
1306         }
1307
1308         lun_p = core_tpg_pre_addlun(tpg, lun);
1309         if ((IS_ERR(lun_p)) || !lun_p)
1310                 return NULL;
1311
1312         if (dev->dev_flags & DF_READ_ONLY)
1313                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1314         else
1315                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1316
1317         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1318                 return NULL;
1319
1320         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1321                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1322                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1323                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1324         /*
1325          * Update LUN maps for dynamically added initiators when
1326          * generate_node_acl is enabled.
1327          */
1328         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1329                 struct se_node_acl *acl;
1330                 spin_lock_irq(&tpg->acl_node_lock);
1331                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1332                         if (acl->dynamic_node_acl &&
1333                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1334                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1335                                 spin_unlock_irq(&tpg->acl_node_lock);
1336                                 core_tpg_add_node_to_devs(acl, tpg);
1337                                 spin_lock_irq(&tpg->acl_node_lock);
1338                         }
1339                 }
1340                 spin_unlock_irq(&tpg->acl_node_lock);
1341         }
1342
1343         return lun_p;
1344 }
1345
1346 /*      core_dev_del_lun():
1347  *
1348  *
1349  */
1350 int core_dev_del_lun(
1351         struct se_portal_group *tpg,
1352         u32 unpacked_lun)
1353 {
1354         struct se_lun *lun;
1355         int ret = 0;
1356
1357         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1358         if (!lun)
1359                 return ret;
1360
1361         core_tpg_post_dellun(tpg, lun);
1362
1363         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1364                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1365                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1366                 tpg->se_tpg_tfo->get_fabric_name());
1367
1368         return 0;
1369 }
1370
1371 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1372 {
1373         struct se_lun *lun;
1374
1375         spin_lock(&tpg->tpg_lun_lock);
1376         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1377                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1378                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1379                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1380                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1381                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1382                 spin_unlock(&tpg->tpg_lun_lock);
1383                 return NULL;
1384         }
1385         lun = &tpg->tpg_lun_list[unpacked_lun];
1386
1387         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1388                 pr_err("%s Logical Unit Number: %u is not free on"
1389                         " Target Portal Group: %hu, ignoring request.\n",
1390                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1391                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1392                 spin_unlock(&tpg->tpg_lun_lock);
1393                 return NULL;
1394         }
1395         spin_unlock(&tpg->tpg_lun_lock);
1396
1397         return lun;
1398 }
1399
1400 /*      core_dev_get_lun():
1401  *
1402  *
1403  */
1404 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1405 {
1406         struct se_lun *lun;
1407
1408         spin_lock(&tpg->tpg_lun_lock);
1409         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1410                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1411                         "_TPG-1: %u for Target Portal Group: %hu\n",
1412                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1413                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1414                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1415                 spin_unlock(&tpg->tpg_lun_lock);
1416                 return NULL;
1417         }
1418         lun = &tpg->tpg_lun_list[unpacked_lun];
1419
1420         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1421                 pr_err("%s Logical Unit Number: %u is not active on"
1422                         " Target Portal Group: %hu, ignoring request.\n",
1423                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1424                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1425                 spin_unlock(&tpg->tpg_lun_lock);
1426                 return NULL;
1427         }
1428         spin_unlock(&tpg->tpg_lun_lock);
1429
1430         return lun;
1431 }
1432
1433 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1434         struct se_portal_group *tpg,
1435         u32 mapped_lun,
1436         char *initiatorname,
1437         int *ret)
1438 {
1439         struct se_lun_acl *lacl;
1440         struct se_node_acl *nacl;
1441
1442         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1443                 pr_err("%s InitiatorName exceeds maximum size.\n",
1444                         tpg->se_tpg_tfo->get_fabric_name());
1445                 *ret = -EOVERFLOW;
1446                 return NULL;
1447         }
1448         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1449         if (!nacl) {
1450                 *ret = -EINVAL;
1451                 return NULL;
1452         }
1453         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1454         if (!lacl) {
1455                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1456                 *ret = -ENOMEM;
1457                 return NULL;
1458         }
1459
1460         INIT_LIST_HEAD(&lacl->lacl_list);
1461         lacl->mapped_lun = mapped_lun;
1462         lacl->se_lun_nacl = nacl;
1463         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1464
1465         return lacl;
1466 }
1467
1468 int core_dev_add_initiator_node_lun_acl(
1469         struct se_portal_group *tpg,
1470         struct se_lun_acl *lacl,
1471         u32 unpacked_lun,
1472         u32 lun_access)
1473 {
1474         struct se_lun *lun;
1475         struct se_node_acl *nacl;
1476
1477         lun = core_dev_get_lun(tpg, unpacked_lun);
1478         if (!lun) {
1479                 pr_err("%s Logical Unit Number: %u is not active on"
1480                         " Target Portal Group: %hu, ignoring request.\n",
1481                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1482                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1483                 return -EINVAL;
1484         }
1485
1486         nacl = lacl->se_lun_nacl;
1487         if (!nacl)
1488                 return -EINVAL;
1489
1490         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1491             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1492                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1493
1494         lacl->se_lun = lun;
1495
1496         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1497                         lun_access, nacl, tpg, 1) < 0)
1498                 return -EINVAL;
1499
1500         spin_lock(&lun->lun_acl_lock);
1501         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1502         atomic_inc(&lun->lun_acl_count);
1503         smp_mb__after_atomic_inc();
1504         spin_unlock(&lun->lun_acl_lock);
1505
1506         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1507                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1508                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1509                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1510                 lacl->initiatorname);
1511         /*
1512          * Check to see if there are any existing persistent reservation APTPL
1513          * pre-registrations that need to be enabled for this LUN ACL..
1514          */
1515         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1516         return 0;
1517 }
1518
1519 /*      core_dev_del_initiator_node_lun_acl():
1520  *
1521  *
1522  */
1523 int core_dev_del_initiator_node_lun_acl(
1524         struct se_portal_group *tpg,
1525         struct se_lun *lun,
1526         struct se_lun_acl *lacl)
1527 {
1528         struct se_node_acl *nacl;
1529
1530         nacl = lacl->se_lun_nacl;
1531         if (!nacl)
1532                 return -EINVAL;
1533
1534         spin_lock(&lun->lun_acl_lock);
1535         list_del(&lacl->lacl_list);
1536         atomic_dec(&lun->lun_acl_count);
1537         smp_mb__after_atomic_dec();
1538         spin_unlock(&lun->lun_acl_lock);
1539
1540         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1541                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1542
1543         lacl->se_lun = NULL;
1544
1545         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1546                 " InitiatorNode: %s Mapped LUN: %u\n",
1547                 tpg->se_tpg_tfo->get_fabric_name(),
1548                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1549                 lacl->initiatorname, lacl->mapped_lun);
1550
1551         return 0;
1552 }
1553
1554 void core_dev_free_initiator_node_lun_acl(
1555         struct se_portal_group *tpg,
1556         struct se_lun_acl *lacl)
1557 {
1558         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1559                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1560                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1561                 tpg->se_tpg_tfo->get_fabric_name(),
1562                 lacl->initiatorname, lacl->mapped_lun);
1563
1564         kfree(lacl);
1565 }
1566
1567 int core_dev_setup_virtual_lun0(void)
1568 {
1569         struct se_hba *hba;
1570         struct se_device *dev;
1571         struct se_subsystem_dev *se_dev = NULL;
1572         struct se_subsystem_api *t;
1573         char buf[16];
1574         int ret;
1575
1576         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1577         if (IS_ERR(hba))
1578                 return PTR_ERR(hba);
1579
1580         lun0_hba = hba;
1581         t = hba->transport;
1582
1583         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1584         if (!se_dev) {
1585                 pr_err("Unable to allocate memory for"
1586                                 " struct se_subsystem_dev\n");
1587                 ret = -ENOMEM;
1588                 goto out;
1589         }
1590         INIT_LIST_HEAD(&se_dev->se_dev_node);
1591         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1592         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1593         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1594         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1595         spin_lock_init(&se_dev->t10_pr.registration_lock);
1596         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1597         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1598         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1599         spin_lock_init(&se_dev->se_dev_lock);
1600         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1601         se_dev->t10_wwn.t10_sub_dev = se_dev;
1602         se_dev->t10_alua.t10_sub_dev = se_dev;
1603         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1604         se_dev->se_dev_hba = hba;
1605
1606         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1607         if (!se_dev->se_dev_su_ptr) {
1608                 pr_err("Unable to locate subsystem dependent pointer"
1609                         " from allocate_virtdevice()\n");
1610                 ret = -ENOMEM;
1611                 goto out;
1612         }
1613         lun0_su_dev = se_dev;
1614
1615         memset(buf, 0, 16);
1616         sprintf(buf, "rd_pages=8");
1617         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1618
1619         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1620         if (IS_ERR(dev)) {
1621                 ret = PTR_ERR(dev);
1622                 goto out;
1623         }
1624         se_dev->se_dev_ptr = dev;
1625         g_lun0_dev = dev;
1626
1627         return 0;
1628 out:
1629         lun0_su_dev = NULL;
1630         kfree(se_dev);
1631         if (lun0_hba) {
1632                 core_delete_hba(lun0_hba);
1633                 lun0_hba = NULL;
1634         }
1635         return ret;
1636 }
1637
1638
1639 void core_dev_release_virtual_lun0(void)
1640 {
1641         struct se_hba *hba = lun0_hba;
1642         struct se_subsystem_dev *su_dev = lun0_su_dev;
1643
1644         if (!hba)
1645                 return;
1646
1647         if (g_lun0_dev)
1648                 se_free_virtual_device(g_lun0_dev, hba);
1649
1650         kfree(su_dev);
1651         core_delete_hba(hba);
1652 }