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_backend.h>
  46 #include <target/target_core_fabric.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_ua.h"
  52
  53 static void se_dev_start(struct se_device *dev);
  54 static void se_dev_stop(struct se_device *dev);
  55
  56 static struct se_hba *lun0_hba;
  57 static struct se_subsystem_dev *lun0_su_dev;
  58 /* not static, needed by tpg.c */
  59 struct se_device *g_lun0_dev;
  60
  61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  62 {
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = se_cmd->se_sess;
  65         struct se_device *dev;
  66         unsigned long flags;
  67
  68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  71                 return -ENODEV;
  72         }
  73
  74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  75         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                 struct se_dev_entry *deve = se_cmd->se_deve;
  78
  79                 deve->total_cmds++;
  80                 deve->total_bytes += se_cmd->data_length;
  81
  82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  87                                 " Access for 0x%08x\n",
  88                                 se_cmd->se_tfo->get_fabric_name(),
  89                                 unpacked_lun);
  90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  91                         return -EACCES;
  92                 }
  93
  94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  95                         deve->write_bytes += se_cmd->data_length;
  96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  97                         deve->read_bytes += se_cmd->data_length;
  98
  99                 deve->deve_cmds++;
 100
 101                 se_lun = deve->se_lun;
 102                 se_cmd->se_lun = deve->se_lun;
 103                 se_cmd->pr_res_key = deve->pr_res_key;
 104                 se_cmd->orig_fe_lun = unpacked_lun;
 105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 106         }
 107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 108
 109         if (!se_lun) {
 110                 /*
 111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 112                  * REPORT_LUNS, et al to be returned when no active
 113                  * MappedLUN=0 exists for this Initiator Port.
 114                  */
 115                 if (unpacked_lun != 0) {
 116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 119                                 " Access for 0x%08x\n",
 120                                 se_cmd->se_tfo->get_fabric_name(),
 121                                 unpacked_lun);
 122                         return -ENODEV;
 123                 }
 124                 /*
 125                  * Force WRITE PROTECT for virtual LUN 0
 126                  */
 127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                     (se_cmd->data_direction != DMA_NONE)) {
 129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 131                         return -EACCES;
 132                 }
 133
 134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                 se_cmd->orig_fe_lun = 0;
 137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 138         }
 139         /*
 140          * Determine if the struct se_lun is online.
 141          * FIXME: Check for LUN_RESET + UNIT Attention
 142          */
 143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 146                 return -ENODEV;
 147         }
 148
 149         /* Directly associate cmd with se_dev */
 150         se_cmd->se_dev = se_lun->lun_se_dev;
 151
 152         /* TODO: get rid of this and use atomics for stats */
 153         dev = se_lun->lun_se_dev;
 154         spin_lock_irqsave(&dev->stats_lock, flags);
 155         dev->num_cmds++;
 156         if (se_cmd->data_direction == DMA_TO_DEVICE)
 157                 dev->write_bytes += se_cmd->data_length;
 158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 159                 dev->read_bytes += se_cmd->data_length;
 160         spin_unlock_irqrestore(&dev->stats_lock, flags);
 161
 162         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 163         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 164         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 169
 170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 171 {
 172         struct se_dev_entry *deve;
 173         struct se_lun *se_lun = NULL;
 174         struct se_session *se_sess = se_cmd->se_sess;
 175         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 176         unsigned long flags;
 177
 178         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 179                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 180                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 181                 return -ENODEV;
 182         }
 183
 184         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 185         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 186         deve = se_cmd->se_deve;
 187
 188         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 189                 se_tmr->tmr_lun = deve->se_lun;
 190                 se_cmd->se_lun = deve->se_lun;
 191                 se_lun = deve->se_lun;
 192                 se_cmd->pr_res_key = deve->pr_res_key;
 193                 se_cmd->orig_fe_lun = unpacked_lun;
 194         }
 195         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 196
 197         if (!se_lun) {
 198                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 199                         " Access for 0x%08x\n",
 200                         se_cmd->se_tfo->get_fabric_name(),
 201                         unpacked_lun);
 202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 203                 return -ENODEV;
 204         }
 205         /*
 206          * Determine if the struct se_lun is online.
 207          * FIXME: Check for LUN_RESET + UNIT Attention
 208          */
 209         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 210                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 211                 return -ENODEV;
 212         }
 213
 214         /* Directly associate cmd with se_dev */
 215         se_cmd->se_dev = se_lun->lun_se_dev;
 216         se_tmr->tmr_dev = se_lun->lun_se_dev;
 217
 218         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 219         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 220         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 221
 222         return 0;
 223 }
 224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 225
 226 /*
 227  * This function is called from core_scsi3_emulate_pro_register_and_move()
 228  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 229  * when a matching rtpi is found.
 230  */
 231 struct se_dev_entry *core_get_se_deve_from_rtpi(
 232         struct se_node_acl *nacl,
 233         u16 rtpi)
 234 {
 235         struct se_dev_entry *deve;
 236         struct se_lun *lun;
 237         struct se_port *port;
 238         struct se_portal_group *tpg = nacl->se_tpg;
 239         u32 i;
 240
 241         spin_lock_irq(&nacl->device_list_lock);
 242         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 243                 deve = nacl->device_list[i];
 244
 245                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 246                         continue;
 247
 248                 lun = deve->se_lun;
 249                 if (!lun) {
 250                         pr_err("%s device entries device pointer is"
 251                                 " NULL, but Initiator has access.\n",
 252                                 tpg->se_tpg_tfo->get_fabric_name());
 253                         continue;
 254                 }
 255                 port = lun->lun_sep;
 256                 if (!port) {
 257                         pr_err("%s device entries device pointer is"
 258                                 " NULL, but Initiator has access.\n",
 259                                 tpg->se_tpg_tfo->get_fabric_name());
 260                         continue;
 261                 }
 262                 if (port->sep_rtpi != rtpi)
 263                         continue;
 264
 265                 atomic_inc(&deve->pr_ref_count);
 266                 smp_mb__after_atomic_inc();
 267                 spin_unlock_irq(&nacl->device_list_lock);
 268
 269                 return deve;
 270         }
 271         spin_unlock_irq(&nacl->device_list_lock);
 272
 273         return NULL;
 274 }
 275
 276 int core_free_device_list_for_node(
 277         struct se_node_acl *nacl,
 278         struct se_portal_group *tpg)
 279 {
 280         struct se_dev_entry *deve;
 281         struct se_lun *lun;
 282         u32 i;
 283
 284         if (!nacl->device_list)
 285                 return 0;
 286
 287         spin_lock_irq(&nacl->device_list_lock);
 288         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 289                 deve = nacl->device_list[i];
 290
 291                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 292                         continue;
 293
 294                 if (!deve->se_lun) {
 295                         pr_err("%s device entries device pointer is"
 296                                 " NULL, but Initiator has access.\n",
 297                                 tpg->se_tpg_tfo->get_fabric_name());
 298                         continue;
 299                 }
 300                 lun = deve->se_lun;
 301
 302                 spin_unlock_irq(&nacl->device_list_lock);
 303                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 304                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 305                 spin_lock_irq(&nacl->device_list_lock);
 306         }
 307         spin_unlock_irq(&nacl->device_list_lock);
 308
 309         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 310         nacl->device_list = NULL;
 311
 312         return 0;
 313 }
 314
 315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 316 {
 317         struct se_dev_entry *deve;
 318         unsigned long flags;
 319
 320         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 321         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 322         deve->deve_cmds--;
 323         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 324 }
 325
 326 void core_update_device_list_access(
 327         u32 mapped_lun,
 328         u32 lun_access,
 329         struct se_node_acl *nacl)
 330 {
 331         struct se_dev_entry *deve;
 332
 333         spin_lock_irq(&nacl->device_list_lock);
 334         deve = nacl->device_list[mapped_lun];
 335         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 336                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 337                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 338         } else {
 339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341         }
 342         spin_unlock_irq(&nacl->device_list_lock);
 343 }
 344
 345 /*      core_update_device_list_for_node():
 346  *
 347  *
 348  */
 349 int core_update_device_list_for_node(
 350         struct se_lun *lun,
 351         struct se_lun_acl *lun_acl,
 352         u32 mapped_lun,
 353         u32 lun_access,
 354         struct se_node_acl *nacl,
 355         struct se_portal_group *tpg,
 356         int enable)
 357 {
 358         struct se_port *port = lun->lun_sep;
 359         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 360         int trans = 0;
 361         /*
 362          * If the MappedLUN entry is being disabled, the entry in
 363          * port->sep_alua_list must be removed now before clearing the
 364          * struct se_dev_entry pointers below as logic in
 365          * core_alua_do_transition_tg_pt() depends on these being present.
 366          */
 367         if (!enable) {
 368                 /*
 369                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 370                  * that have not been explicitly concerted to MappedLUNs ->
 371                  * struct se_lun_acl, but we remove deve->alua_port_list from
 372                  * port->sep_alua_list. This also means that active UAs and
 373                  * NodeACL context specific PR metadata for demo-mode
 374                  * MappedLUN *deve will be released below..
 375                  */
 376                 spin_lock_bh(&port->sep_alua_lock);
 377                 list_del(&deve->alua_port_list);
 378                 spin_unlock_bh(&port->sep_alua_lock);
 379         }
 380
 381         spin_lock_irq(&nacl->device_list_lock);
 382         if (enable) {
 383                 /*
 384                  * Check if the call is handling demo mode -> explict LUN ACL
 385                  * transition.  This transition must be for the same struct se_lun
 386                  * + mapped_lun that was setup in demo mode..
 387                  */
 388                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 389                         if (deve->se_lun_acl != NULL) {
 390                                 pr_err("struct se_dev_entry->se_lun_acl"
 391                                         " already set for demo mode -> explict"
 392                                         " LUN ACL transition\n");
 393                                 spin_unlock_irq(&nacl->device_list_lock);
 394                                 return -EINVAL;
 395                         }
 396                         if (deve->se_lun != lun) {
 397                                 pr_err("struct se_dev_entry->se_lun does"
 398                                         " match passed struct se_lun for demo mode"
 399                                         " -> explict LUN ACL transition\n");
 400                                 spin_unlock_irq(&nacl->device_list_lock);
 401                                 return -EINVAL;
 402                         }
 403                         deve->se_lun_acl = lun_acl;
 404                         trans = 1;
 405                 } else {
 406                         deve->se_lun = lun;
 407                         deve->se_lun_acl = lun_acl;
 408                         deve->mapped_lun = mapped_lun;
 409                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 410                 }
 411
 412                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 413                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 415                 } else {
 416                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 417                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 418                 }
 419
 420                 if (trans) {
 421                         spin_unlock_irq(&nacl->device_list_lock);
 422                         return 0;
 423                 }
 424                 deve->creation_time = get_jiffies_64();
 425                 deve->attach_count++;
 426                 spin_unlock_irq(&nacl->device_list_lock);
 427
 428                 spin_lock_bh(&port->sep_alua_lock);
 429                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 430                 spin_unlock_bh(&port->sep_alua_lock);
 431
 432                 return 0;
 433         }
 434         /*
 435          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 436          * PR operation to complete.
 437          */
 438         spin_unlock_irq(&nacl->device_list_lock);
 439         while (atomic_read(&deve->pr_ref_count) != 0)
 440                 cpu_relax();
 441         spin_lock_irq(&nacl->device_list_lock);
 442         /*
 443          * Disable struct se_dev_entry LUN ACL mapping
 444          */
 445         core_scsi3_ua_release_all(deve);
 446         deve->se_lun = NULL;
 447         deve->se_lun_acl = NULL;
 448         deve->lun_flags = 0;
 449         deve->creation_time = 0;
 450         deve->attach_count--;
 451         spin_unlock_irq(&nacl->device_list_lock);
 452
 453         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 454         return 0;
 455 }
 456
 457 /*      core_clear_lun_from_tpg():
 458  *
 459  *
 460  */
 461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 462 {
 463         struct se_node_acl *nacl;
 464         struct se_dev_entry *deve;
 465         u32 i;
 466
 467         spin_lock_irq(&tpg->acl_node_lock);
 468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 469                 spin_unlock_irq(&tpg->acl_node_lock);
 470
 471                 spin_lock_irq(&nacl->device_list_lock);
 472                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 473                         deve = nacl->device_list[i];
 474                         if (lun != deve->se_lun)
 475                                 continue;
 476                         spin_unlock_irq(&nacl->device_list_lock);
 477
 478                         core_update_device_list_for_node(lun, NULL,
 479                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 480                                 nacl, tpg, 0);
 481
 482                         spin_lock_irq(&nacl->device_list_lock);
 483                 }
 484                 spin_unlock_irq(&nacl->device_list_lock);
 485
 486                 spin_lock_irq(&tpg->acl_node_lock);
 487         }
 488         spin_unlock_irq(&tpg->acl_node_lock);
 489 }
 490
 491 static struct se_port *core_alloc_port(struct se_device *dev)
 492 {
 493         struct se_port *port, *port_tmp;
 494
 495         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 496         if (!port) {
 497                 pr_err("Unable to allocate struct se_port\n");
 498                 return ERR_PTR(-ENOMEM);
 499         }
 500         INIT_LIST_HEAD(&port->sep_alua_list);
 501         INIT_LIST_HEAD(&port->sep_list);
 502         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 503         spin_lock_init(&port->sep_alua_lock);
 504         mutex_init(&port->sep_tg_pt_md_mutex);
 505
 506         spin_lock(&dev->se_port_lock);
 507         if (dev->dev_port_count == 0x0000ffff) {
 508                 pr_warn("Reached dev->dev_port_count =="
 509                                 " 0x0000ffff\n");
 510                 spin_unlock(&dev->se_port_lock);
 511                 return ERR_PTR(-ENOSPC);
 512         }
 513 again:
 514         /*
 515          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 516          * Here is the table from spc4r17 section 7.7.3.8.
 517          *
 518          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 519          *
 520          * Code      Description
 521          * 0h        Reserved
 522          * 1h        Relative port 1, historically known as port A
 523          * 2h        Relative port 2, historically known as port B
 524          * 3h to FFFFh    Relative port 3 through 65 535
 525          */
 526         port->sep_rtpi = dev->dev_rpti_counter++;
 527         if (!port->sep_rtpi)
 528                 goto again;
 529
 530         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 531                 /*
 532                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 533                  * for 16-bit wrap..
 534                  */
 535                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 536                         goto again;
 537         }
 538         spin_unlock(&dev->se_port_lock);
 539
 540         return port;
 541 }
 542
 543 static void core_export_port(
 544         struct se_device *dev,
 545         struct se_portal_group *tpg,
 546         struct se_port *port,
 547         struct se_lun *lun)
 548 {
 549         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 550         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 551
 552         spin_lock(&dev->se_port_lock);
 553         spin_lock(&lun->lun_sep_lock);
 554         port->sep_tpg = tpg;
 555         port->sep_lun = lun;
 556         lun->lun_sep = port;
 557         spin_unlock(&lun->lun_sep_lock);
 558
 559         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 560         spin_unlock(&dev->se_port_lock);
 561
 562         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 563                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 564                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 565                         pr_err("Unable to allocate t10_alua_tg_pt"
 566                                         "_gp_member_t\n");
 567                         return;
 568                 }
 569                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 570                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 571                         su_dev->t10_alua.default_tg_pt_gp);
 572                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 573                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 574                         " Group: alua/default_tg_pt_gp\n",
 575                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 576         }
 577
 578         dev->dev_port_count++;
 579         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 580 }
 581
 582 /*
 583  *      Called with struct se_device->se_port_lock spinlock held.
 584  */
 585 static void core_release_port(struct se_device *dev, struct se_port *port)
 586         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 587 {
 588         /*
 589          * Wait for any port reference for PR ALL_TG_PT=1 operation
 590          * to complete in __core_scsi3_alloc_registration()
 591          */
 592         spin_unlock(&dev->se_port_lock);
 593         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 594                 cpu_relax();
 595         spin_lock(&dev->se_port_lock);
 596
 597         core_alua_free_tg_pt_gp_mem(port);
 598
 599         list_del(&port->sep_list);
 600         dev->dev_port_count--;
 601         kfree(port);
 602 }
 603
 604 int core_dev_export(
 605         struct se_device *dev,
 606         struct se_portal_group *tpg,
 607         struct se_lun *lun)
 608 {
 609         struct se_port *port;
 610
 611         port = core_alloc_port(dev);
 612         if (IS_ERR(port))
 613                 return PTR_ERR(port);
 614
 615         lun->lun_se_dev = dev;
 616         se_dev_start(dev);
 617
 618         atomic_inc(&dev->dev_export_obj.obj_access_count);
 619         core_export_port(dev, tpg, port, lun);
 620         return 0;
 621 }
 622
 623 void core_dev_unexport(
 624         struct se_device *dev,
 625         struct se_portal_group *tpg,
 626         struct se_lun *lun)
 627 {
 628         struct se_port *port = lun->lun_sep;
 629
 630         spin_lock(&lun->lun_sep_lock);
 631         if (lun->lun_se_dev == NULL) {
 632                 spin_unlock(&lun->lun_sep_lock);
 633                 return;
 634         }
 635         spin_unlock(&lun->lun_sep_lock);
 636
 637         spin_lock(&dev->se_port_lock);
 638         atomic_dec(&dev->dev_export_obj.obj_access_count);
 639         core_release_port(dev, port);
 640         spin_unlock(&dev->se_port_lock);
 641
 642         se_dev_stop(dev);
 643         lun->lun_se_dev = NULL;
 644 }
 645
 646 int target_report_luns(struct se_task *se_task)
 647 {
 648         struct se_cmd *se_cmd = se_task->task_se_cmd;
 649         struct se_dev_entry *deve;
 650         struct se_session *se_sess = se_cmd->se_sess;
 651         unsigned char *buf;
 652         u32 lun_count = 0, offset = 8, i;
 653
 654         buf = transport_kmap_data_sg(se_cmd);
 655         if (!buf)
 656                 return -ENOMEM;
 657
 658         /*
 659          * If no struct se_session pointer is present, this struct se_cmd is
 660          * coming via a target_core_mod PASSTHROUGH op, and not through
 661          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 662          */
 663         if (!se_sess) {
 664                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 665                 lun_count = 1;
 666                 goto done;
 667         }
 668
 669         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 670         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 671                 deve = se_sess->se_node_acl->device_list[i];
 672                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 673                         continue;
 674                 /*
 675                  * We determine the correct LUN LIST LENGTH even once we
 676                  * have reached the initial allocation length.
 677                  * See SPC2-R20 7.19.
 678                  */
 679                 lun_count++;
 680                 if ((offset + 8) > se_cmd->data_length)
 681                         continue;
 682
 683                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 684                 offset += 8;
 685         }
 686         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 687
 688         /*
 689          * See SPC3 r07, page 159.
 690          */
 691 done:
 692         lun_count *= 8;
 693         buf[0] = ((lun_count >> 24) & 0xff);
 694         buf[1] = ((lun_count >> 16) & 0xff);
 695         buf[2] = ((lun_count >> 8) & 0xff);
 696         buf[3] = (lun_count & 0xff);
 697         transport_kunmap_data_sg(se_cmd);
 698
 699         se_task->task_scsi_status = GOOD;
 700         transport_complete_task(se_task, 1);
 701         return 0;
 702 }
 703
 704 /*      se_release_device_for_hba():
 705  *
 706  *
 707  */
 708 void se_release_device_for_hba(struct se_device *dev)
 709 {
 710         struct se_hba *hba = dev->se_hba;
 711
 712         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 713             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 714             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 715             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 716             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 717                 se_dev_stop(dev);
 718
 719         if (dev->dev_ptr) {
 720                 kthread_stop(dev->process_thread);
 721                 if (dev->transport->free_device)
 722                         dev->transport->free_device(dev->dev_ptr);
 723         }
 724
 725         spin_lock(&hba->device_lock);
 726         list_del(&dev->dev_list);
 727         hba->dev_count--;
 728         spin_unlock(&hba->device_lock);
 729
 730         core_scsi3_free_all_registrations(dev);
 731         se_release_vpd_for_dev(dev);
 732
 733         kfree(dev);
 734 }
 735
 736 void se_release_vpd_for_dev(struct se_device *dev)
 737 {
 738         struct t10_vpd *vpd, *vpd_tmp;
 739
 740         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 741         list_for_each_entry_safe(vpd, vpd_tmp,
 742                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 743                 list_del(&vpd->vpd_list);
 744                 kfree(vpd);
 745         }
 746         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 747 }
 748
 749 /*      se_free_virtual_device():
 750  *
 751  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 752  */
 753 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 754 {
 755         if (!list_empty(&dev->dev_sep_list))
 756                 dump_stack();
 757
 758         core_alua_free_lu_gp_mem(dev);
 759         se_release_device_for_hba(dev);
 760
 761         return 0;
 762 }
 763
 764 static void se_dev_start(struct se_device *dev)
 765 {
 766         struct se_hba *hba = dev->se_hba;
 767
 768         spin_lock(&hba->device_lock);
 769         atomic_inc(&dev->dev_obj.obj_access_count);
 770         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 771                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 772                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 773                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 774                 } else if (dev->dev_status &
 775                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 776                         dev->dev_status &=
 777                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 778                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 779                 }
 780         }
 781         spin_unlock(&hba->device_lock);
 782 }
 783
 784 static void se_dev_stop(struct se_device *dev)
 785 {
 786         struct se_hba *hba = dev->se_hba;
 787
 788         spin_lock(&hba->device_lock);
 789         atomic_dec(&dev->dev_obj.obj_access_count);
 790         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 791                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 792                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 793                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 794                 } else if (dev->dev_status &
 795                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 796                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 797                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 798                 }
 799         }
 800         spin_unlock(&hba->device_lock);
 801 }
 802
 803 int se_dev_check_online(struct se_device *dev)
 804 {
 805         unsigned long flags;
 806         int ret;
 807
 808         spin_lock_irqsave(&dev->dev_status_lock, flags);
 809         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 810                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 811         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 812
 813         return ret;
 814 }
 815
 816 int se_dev_check_shutdown(struct se_device *dev)
 817 {
 818         int ret;
 819
 820         spin_lock_irq(&dev->dev_status_lock);
 821         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 822         spin_unlock_irq(&dev->dev_status_lock);
 823
 824         return ret;
 825 }
 826
 827 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 828 {
 829         u32 tmp, aligned_max_sectors;
 830         /*
 831          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 832          * transport_allocate_data_tasks() operation.
 833          */
 834         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 835         aligned_max_sectors = (tmp / block_size);
 836         if (max_sectors != aligned_max_sectors) {
 837                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 838                                 " to %u\n", max_sectors, aligned_max_sectors);
 839                 return aligned_max_sectors;
 840         }
 841
 842         return max_sectors;
 843 }
 844
 845 void se_dev_set_default_attribs(
 846         struct se_device *dev,
 847         struct se_dev_limits *dev_limits)
 848 {
 849         struct queue_limits *limits = &dev_limits->limits;
 850
 851         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 852         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 853         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 854         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 855         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 856         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 857         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 858         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 859         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 860         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 861         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 862         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 863         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 864         /*
 865          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 866          * iblock_create_virtdevice() from struct queue_limits values
 867          * if blk_queue_discard()==1
 868          */
 869         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 870         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 871                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 872         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 873         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 874                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 875         /*
 876          * block_size is based on subsystem plugin dependent requirements.
 877          */
 878         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 879         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 880         /*
 881          * max_sectors is based on subsystem plugin dependent requirements.
 882          */
 883         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 884         /*
 885          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
 886          */
 887         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
 888                                                 limits->logical_block_size);
 889         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
 890         /*
 891          * Set fabric_max_sectors, which is reported in block limits
 892          * VPD page (B0h).
 893          */
 894         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
 895         /*
 896          * Set optimal_sectors from fabric_max_sectors, which can be
 897          * lowered via configfs.
 898          */
 899         dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
 900         /*
 901          * queue_depth is based on subsystem plugin dependent requirements.
 902          */
 903         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 904         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 905 }
 906
 907 int se_dev_set_max_unmap_lba_count(
 908         struct se_device *dev,
 909         u32 max_unmap_lba_count)
 910 {
 911         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 912         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 913                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 914         return 0;
 915 }
 916
 917 int se_dev_set_max_unmap_block_desc_count(
 918         struct se_device *dev,
 919         u32 max_unmap_block_desc_count)
 920 {
 921         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 922                 max_unmap_block_desc_count;
 923         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 924                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 925         return 0;
 926 }
 927
 928 int se_dev_set_unmap_granularity(
 929         struct se_device *dev,
 930         u32 unmap_granularity)
 931 {
 932         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 933         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 934                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 935         return 0;
 936 }
 937
 938 int se_dev_set_unmap_granularity_alignment(
 939         struct se_device *dev,
 940         u32 unmap_granularity_alignment)
 941 {
 942         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 943         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 944                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 945         return 0;
 946 }
 947
 948 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 949 {
 950         if (flag != 0 && flag != 1) {
 951                 pr_err("Illegal value %d\n", flag);
 952                 return -EINVAL;
 953         }
 954
 955         if (flag) {
 956                 pr_err("dpo_emulated not supported\n");
 957                 return -EINVAL;
 958         }
 959
 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                 pr_err("Illegal value %d\n", flag);
 967                 return -EINVAL;
 968         }
 969
 970         if (flag && dev->transport->fua_write_emulated == 0) {
 971                 pr_err("fua_write_emulated not supported\n");
 972                 return -EINVAL;
 973         }
 974         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 975         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 976                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 977         return 0;
 978 }
 979
 980 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 981 {
 982         if (flag != 0 && flag != 1) {
 983                 pr_err("Illegal value %d\n", flag);
 984                 return -EINVAL;
 985         }
 986
 987         if (flag) {
 988                 pr_err("ua read emulated not supported\n");
 989                 return -EINVAL;
 990         }
 991
 992         return 0;
 993 }
 994
 995 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 996 {
 997         if (flag != 0 && flag != 1) {
 998                 pr_err("Illegal value %d\n", flag);
 999                 return -EINVAL;
1000         }
1001         if (flag && dev->transport->write_cache_emulated == 0) {
1002                 pr_err("write_cache_emulated not supported\n");
1003                 return -EINVAL;
1004         }
1005         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1006         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1007                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1008         return 0;
1009 }
1010
1011 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1012 {
1013         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1014                 pr_err("Illegal value %d\n", flag);
1015                 return -EINVAL;
1016         }
1017
1018         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1019                 pr_err("dev[%p]: Unable to change SE Device"
1020                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1021                         " exists\n", dev,
1022                         atomic_read(&dev->dev_export_obj.obj_access_count));
1023                 return -EINVAL;
1024         }
1025         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1026         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1027                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1028
1029         return 0;
1030 }
1031
1032 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1033 {
1034         if ((flag != 0) && (flag != 1)) {
1035                 pr_err("Illegal value %d\n", flag);
1036                 return -EINVAL;
1037         }
1038
1039         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1040                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1041                         " dev_export_obj: %d count exists\n", dev,
1042                         atomic_read(&dev->dev_export_obj.obj_access_count));
1043                 return -EINVAL;
1044         }
1045         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1046         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1047                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1048
1049         return 0;
1050 }
1051
1052 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1053 {
1054         if ((flag != 0) && (flag != 1)) {
1055                 pr_err("Illegal value %d\n", flag);
1056                 return -EINVAL;
1057         }
1058         /*
1059          * We expect this value to be non-zero when generic Block Layer
1060          * Discard supported is detected iblock_create_virtdevice().
1061          */
1062         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1063                 pr_err("Generic Block Discard not supported\n");
1064                 return -ENOSYS;
1065         }
1066
1067         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1068         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1069                                 dev, flag);
1070         return 0;
1071 }
1072
1073 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1074 {
1075         if ((flag != 0) && (flag != 1)) {
1076                 pr_err("Illegal value %d\n", flag);
1077                 return -EINVAL;
1078         }
1079         /*
1080          * We expect this value to be non-zero when generic Block Layer
1081          * Discard supported is detected iblock_create_virtdevice().
1082          */
1083         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1084                 pr_err("Generic Block Discard not supported\n");
1085                 return -ENOSYS;
1086         }
1087
1088         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1089         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1090                                 dev, flag);
1091         return 0;
1092 }
1093
1094 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1095 {
1096         if ((flag != 0) && (flag != 1)) {
1097                 pr_err("Illegal value %d\n", flag);
1098                 return -EINVAL;
1099         }
1100         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1101         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1102                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1103         return 0;
1104 }
1105
1106 int se_dev_set_is_nonrot(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.is_nonrot = flag;
1113         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1114                dev, flag);
1115         return 0;
1116 }
1117
1118 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1119 {
1120         if (flag != 0) {
1121                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1122                         " reordering not implemented\n", dev);
1123                 return -ENOSYS;
1124         }
1125         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1126         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1127         return 0;
1128 }
1129
1130 /*
1131  * Note, this can only be called on unexported SE Device Object.
1132  */
1133 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1134 {
1135         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1136                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1137                         " dev_export_obj: %d count exists\n", dev,
1138                         atomic_read(&dev->dev_export_obj.obj_access_count));
1139                 return -EINVAL;
1140         }
1141         if (!queue_depth) {
1142                 pr_err("dev[%p]: Illegal ZERO value for queue"
1143                         "_depth\n", dev);
1144                 return -EINVAL;
1145         }
1146
1147         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1149                         pr_err("dev[%p]: Passed queue_depth: %u"
1150                                 " exceeds TCM/SE_Device TCQ: %u\n",
1151                                 dev, queue_depth,
1152                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1153                         return -EINVAL;
1154                 }
1155         } else {
1156                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1157                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1158                                 pr_err("dev[%p]: Passed queue_depth:"
1159                                         " %u exceeds TCM/SE_Device MAX"
1160                                         " TCQ: %u\n", dev, queue_depth,
1161                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1162                                 return -EINVAL;
1163                         }
1164                 }
1165         }
1166
1167         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1168         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1169                         dev, queue_depth);
1170         return 0;
1171 }
1172
1173 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1174 {
1175         int force = 0; /* Force setting for VDEVS */
1176
1177         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1178                 pr_err("dev[%p]: Unable to change SE Device"
1179                         " max_sectors while dev_export_obj: %d count exists\n",
1180                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1181                 return -EINVAL;
1182         }
1183         if (!max_sectors) {
1184                 pr_err("dev[%p]: Illegal ZERO value for"
1185                         " max_sectors\n", dev);
1186                 return -EINVAL;
1187         }
1188         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1189                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1190                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1191                                 DA_STATUS_MAX_SECTORS_MIN);
1192                 return -EINVAL;
1193         }
1194         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1195                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1196                         pr_err("dev[%p]: Passed max_sectors: %u"
1197                                 " greater than TCM/SE_Device max_sectors:"
1198                                 " %u\n", dev, max_sectors,
1199                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1200                          return -EINVAL;
1201                 }
1202         } else {
1203                 if (!force && (max_sectors >
1204                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1205                         pr_err("dev[%p]: Passed max_sectors: %u"
1206                                 " greater than TCM/SE_Device max_sectors"
1207                                 ": %u, use force=1 to override.\n", dev,
1208                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1209                         return -EINVAL;
1210                 }
1211                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1212                         pr_err("dev[%p]: Passed max_sectors: %u"
1213                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1214                                 " %u\n", dev, max_sectors,
1215                                 DA_STATUS_MAX_SECTORS_MAX);
1216                         return -EINVAL;
1217                 }
1218         }
1219         /*
1220          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1221          */
1222         max_sectors = se_dev_align_max_sectors(max_sectors,
1223                                 dev->se_sub_dev->se_dev_attrib.block_size);
1224
1225         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1226         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1227                         dev, max_sectors);
1228         return 0;
1229 }
1230
1231 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1232 {
1233         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1234                 pr_err("dev[%p]: Unable to change SE Device"
1235                         " fabric_max_sectors while dev_export_obj: %d count exists\n",
1236                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1237                 return -EINVAL;
1238         }
1239         if (!fabric_max_sectors) {
1240                 pr_err("dev[%p]: Illegal ZERO value for"
1241                         " fabric_max_sectors\n", dev);
1242                 return -EINVAL;
1243         }
1244         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1245                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1246                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1247                                 DA_STATUS_MAX_SECTORS_MIN);
1248                 return -EINVAL;
1249         }
1250         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1251                 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1252                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1253                                 " greater than TCM/SE_Device max_sectors:"
1254                                 " %u\n", dev, fabric_max_sectors,
1255                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1256                          return -EINVAL;
1257                 }
1258         } else {
1259                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1260                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1261                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1262                                 " %u\n", dev, fabric_max_sectors,
1263                                 DA_STATUS_MAX_SECTORS_MAX);
1264                         return -EINVAL;
1265                 }
1266         }
1267         /*
1268          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1269          */
1270         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1271                                                       dev->se_sub_dev->se_dev_attrib.block_size);
1272
1273         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1274         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1275                         dev, fabric_max_sectors);
1276         return 0;
1277 }
1278
1279 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1280 {
1281         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1282                 pr_err("dev[%p]: Unable to change SE Device"
1283                         " optimal_sectors while dev_export_obj: %d count exists\n",
1284                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1285                 return -EINVAL;
1286         }
1287         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1288                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1289                                 " changed for TCM/pSCSI\n", dev);
1290                 return -EINVAL;
1291         }
1292         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1293                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1294                         " greater than fabric_max_sectors: %u\n", dev,
1295                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1296                 return -EINVAL;
1297         }
1298
1299         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1300         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1301                         dev, optimal_sectors);
1302         return 0;
1303 }
1304
1305 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1306 {
1307         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1308                 pr_err("dev[%p]: Unable to change SE Device block_size"
1309                         " while dev_export_obj: %d count exists\n", dev,
1310                         atomic_read(&dev->dev_export_obj.obj_access_count));
1311                 return -EINVAL;
1312         }
1313
1314         if ((block_size != 512) &&
1315             (block_size != 1024) &&
1316             (block_size != 2048) &&
1317             (block_size != 4096)) {
1318                 pr_err("dev[%p]: Illegal value for block_device: %u"
1319                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1320                         dev, block_size);
1321                 return -EINVAL;
1322         }
1323
1324         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1325                 pr_err("dev[%p]: Not allowed to change block_size for"
1326                         " Physical Device, use for Linux/SCSI to change"
1327                         " block_size for underlying hardware\n", dev);
1328                 return -EINVAL;
1329         }
1330
1331         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1332         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1333                         dev, block_size);
1334         return 0;
1335 }
1336
1337 struct se_lun *core_dev_add_lun(
1338         struct se_portal_group *tpg,
1339         struct se_hba *hba,
1340         struct se_device *dev,
1341         u32 lun)
1342 {
1343         struct se_lun *lun_p;
1344         u32 lun_access = 0;
1345         int rc;
1346
1347         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1348                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1349                         atomic_read(&dev->dev_access_obj.obj_access_count));
1350                 return ERR_PTR(-EACCES);
1351         }
1352
1353         lun_p = core_tpg_pre_addlun(tpg, lun);
1354         if (IS_ERR(lun_p))
1355                 return lun_p;
1356
1357         if (dev->dev_flags & DF_READ_ONLY)
1358                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1359         else
1360                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1361
1362         rc = core_tpg_post_addlun(tpg, lun_p, lun_access, dev);
1363         if (rc < 0)
1364                 return ERR_PTR(rc);
1365
1366         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1367                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1368                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1369                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1370         /*
1371          * Update LUN maps for dynamically added initiators when
1372          * generate_node_acl is enabled.
1373          */
1374         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1375                 struct se_node_acl *acl;
1376                 spin_lock_irq(&tpg->acl_node_lock);
1377                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1378                         if (acl->dynamic_node_acl &&
1379                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1380                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1381                                 spin_unlock_irq(&tpg->acl_node_lock);
1382                                 core_tpg_add_node_to_devs(acl, tpg);
1383                                 spin_lock_irq(&tpg->acl_node_lock);
1384                         }
1385                 }
1386                 spin_unlock_irq(&tpg->acl_node_lock);
1387         }
1388
1389         return lun_p;
1390 }
1391
1392 /*      core_dev_del_lun():
1393  *
1394  *
1395  */
1396 int core_dev_del_lun(
1397         struct se_portal_group *tpg,
1398         u32 unpacked_lun)
1399 {
1400         struct se_lun *lun;
1401
1402         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1403         if (IS_ERR(lun))
1404                 return PTR_ERR(lun);
1405
1406         core_tpg_post_dellun(tpg, lun);
1407
1408         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1409                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1410                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1411                 tpg->se_tpg_tfo->get_fabric_name());
1412
1413         return 0;
1414 }
1415
1416 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1417 {
1418         struct se_lun *lun;
1419
1420         spin_lock(&tpg->tpg_lun_lock);
1421         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1422                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1423                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1424                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1425                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1426                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1427                 spin_unlock(&tpg->tpg_lun_lock);
1428                 return NULL;
1429         }
1430         lun = tpg->tpg_lun_list[unpacked_lun];
1431
1432         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1433                 pr_err("%s Logical Unit Number: %u is not free on"
1434                         " Target Portal Group: %hu, ignoring request.\n",
1435                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1436                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1437                 spin_unlock(&tpg->tpg_lun_lock);
1438                 return NULL;
1439         }
1440         spin_unlock(&tpg->tpg_lun_lock);
1441
1442         return lun;
1443 }
1444
1445 /*      core_dev_get_lun():
1446  *
1447  *
1448  */
1449 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1450 {
1451         struct se_lun *lun;
1452
1453         spin_lock(&tpg->tpg_lun_lock);
1454         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1455                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1456                         "_TPG-1: %u for Target Portal Group: %hu\n",
1457                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1458                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1459                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1460                 spin_unlock(&tpg->tpg_lun_lock);
1461                 return NULL;
1462         }
1463         lun = tpg->tpg_lun_list[unpacked_lun];
1464
1465         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1466                 pr_err("%s Logical Unit Number: %u is not active on"
1467                         " Target Portal Group: %hu, ignoring request.\n",
1468                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1469                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1470                 spin_unlock(&tpg->tpg_lun_lock);
1471                 return NULL;
1472         }
1473         spin_unlock(&tpg->tpg_lun_lock);
1474
1475         return lun;
1476 }
1477
1478 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1479         struct se_portal_group *tpg,
1480         u32 mapped_lun,
1481         char *initiatorname,
1482         int *ret)
1483 {
1484         struct se_lun_acl *lacl;
1485         struct se_node_acl *nacl;
1486
1487         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1488                 pr_err("%s InitiatorName exceeds maximum size.\n",
1489                         tpg->se_tpg_tfo->get_fabric_name());
1490                 *ret = -EOVERFLOW;
1491                 return NULL;
1492         }
1493         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1494         if (!nacl) {
1495                 *ret = -EINVAL;
1496                 return NULL;
1497         }
1498         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1499         if (!lacl) {
1500                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1501                 *ret = -ENOMEM;
1502                 return NULL;
1503         }
1504
1505         INIT_LIST_HEAD(&lacl->lacl_list);
1506         lacl->mapped_lun = mapped_lun;
1507         lacl->se_lun_nacl = nacl;
1508         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1509
1510         return lacl;
1511 }
1512
1513 int core_dev_add_initiator_node_lun_acl(
1514         struct se_portal_group *tpg,
1515         struct se_lun_acl *lacl,
1516         u32 unpacked_lun,
1517         u32 lun_access)
1518 {
1519         struct se_lun *lun;
1520         struct se_node_acl *nacl;
1521
1522         lun = core_dev_get_lun(tpg, unpacked_lun);
1523         if (!lun) {
1524                 pr_err("%s Logical Unit Number: %u is not active on"
1525                         " Target Portal Group: %hu, ignoring request.\n",
1526                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1527                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1528                 return -EINVAL;
1529         }
1530
1531         nacl = lacl->se_lun_nacl;
1532         if (!nacl)
1533                 return -EINVAL;
1534
1535         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1536             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1537                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1538
1539         lacl->se_lun = lun;
1540
1541         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1542                         lun_access, nacl, tpg, 1) < 0)
1543                 return -EINVAL;
1544
1545         spin_lock(&lun->lun_acl_lock);
1546         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1547         atomic_inc(&lun->lun_acl_count);
1548         smp_mb__after_atomic_inc();
1549         spin_unlock(&lun->lun_acl_lock);
1550
1551         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1552                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1553                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1554                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1555                 lacl->initiatorname);
1556         /*
1557          * Check to see if there are any existing persistent reservation APTPL
1558          * pre-registrations that need to be enabled for this LUN ACL..
1559          */
1560         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1561         return 0;
1562 }
1563
1564 /*      core_dev_del_initiator_node_lun_acl():
1565  *
1566  *
1567  */
1568 int core_dev_del_initiator_node_lun_acl(
1569         struct se_portal_group *tpg,
1570         struct se_lun *lun,
1571         struct se_lun_acl *lacl)
1572 {
1573         struct se_node_acl *nacl;
1574
1575         nacl = lacl->se_lun_nacl;
1576         if (!nacl)
1577                 return -EINVAL;
1578
1579         spin_lock(&lun->lun_acl_lock);
1580         list_del(&lacl->lacl_list);
1581         atomic_dec(&lun->lun_acl_count);
1582         smp_mb__after_atomic_dec();
1583         spin_unlock(&lun->lun_acl_lock);
1584
1585         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1586                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1587
1588         lacl->se_lun = NULL;
1589
1590         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1591                 " InitiatorNode: %s Mapped LUN: %u\n",
1592                 tpg->se_tpg_tfo->get_fabric_name(),
1593                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1594                 lacl->initiatorname, lacl->mapped_lun);
1595
1596         return 0;
1597 }
1598
1599 void core_dev_free_initiator_node_lun_acl(
1600         struct se_portal_group *tpg,
1601         struct se_lun_acl *lacl)
1602 {
1603         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1604                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1605                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1606                 tpg->se_tpg_tfo->get_fabric_name(),
1607                 lacl->initiatorname, lacl->mapped_lun);
1608
1609         kfree(lacl);
1610 }
1611
1612 int core_dev_setup_virtual_lun0(void)
1613 {
1614         struct se_hba *hba;
1615         struct se_device *dev;
1616         struct se_subsystem_dev *se_dev = NULL;
1617         struct se_subsystem_api *t;
1618         char buf[16];
1619         int ret;
1620
1621         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1622         if (IS_ERR(hba))
1623                 return PTR_ERR(hba);
1624
1625         lun0_hba = hba;
1626         t = hba->transport;
1627
1628         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1629         if (!se_dev) {
1630                 pr_err("Unable to allocate memory for"
1631                                 " struct se_subsystem_dev\n");
1632                 ret = -ENOMEM;
1633                 goto out;
1634         }
1635         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1636         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1637         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1638         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1639         spin_lock_init(&se_dev->t10_pr.registration_lock);
1640         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1641         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1642         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1643         spin_lock_init(&se_dev->se_dev_lock);
1644         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1645         se_dev->t10_wwn.t10_sub_dev = se_dev;
1646         se_dev->t10_alua.t10_sub_dev = se_dev;
1647         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1648         se_dev->se_dev_hba = hba;
1649
1650         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1651         if (!se_dev->se_dev_su_ptr) {
1652                 pr_err("Unable to locate subsystem dependent pointer"
1653                         " from allocate_virtdevice()\n");
1654                 ret = -ENOMEM;
1655                 goto out;
1656         }
1657         lun0_su_dev = se_dev;
1658
1659         memset(buf, 0, 16);
1660         sprintf(buf, "rd_pages=8");
1661         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1662
1663         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1664         if (IS_ERR(dev)) {
1665                 ret = PTR_ERR(dev);
1666                 goto out;
1667         }
1668         se_dev->se_dev_ptr = dev;
1669         g_lun0_dev = dev;
1670
1671         return 0;
1672 out:
1673         lun0_su_dev = NULL;
1674         kfree(se_dev);
1675         if (lun0_hba) {
1676                 core_delete_hba(lun0_hba);
1677                 lun0_hba = NULL;
1678         }
1679         return ret;
1680 }
1681
1682
1683 void core_dev_release_virtual_lun0(void)
1684 {
1685         struct se_hba *hba = lun0_hba;
1686         struct se_subsystem_dev *su_dev = lun0_su_dev;
1687
1688         if (!hba)
1689                 return;
1690
1691         if (g_lun0_dev)
1692                 se_free_virtual_device(g_lun0_dev, hba);
1693
1694         kfree(su_dev);
1695         core_delete_hba(hba);
1696 }