kernel/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  * (c) Copyright 2003-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/net.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kthread.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <asm/unaligned.h>
  37 #include <net/sock.h>
  38 #include <net/tcp.h>
  39 #include <scsi/scsi.h>
  40 #include <scsi/scsi_device.h>
  41
  42 #include <target/target_core_base.h>
  43 #include <target/target_core_backend.h>
  44 #include <target/target_core_fabric.h>
  45
  46 #include "target_core_internal.h"
  47 #include "target_core_alua.h"
  48 #include "target_core_pr.h"
  49 #include "target_core_ua.h"
  50
  51 DEFINE_MUTEX(g_device_mutex);
  52 LIST_HEAD(g_device_list);
  53
  54 static struct se_hba *lun0_hba;
  55 /* not static, needed by tpg.c */
  56 struct se_device *g_lun0_dev;
  57
  58 sense_reason_t
  59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  60 {
  61         struct se_lun *se_lun = NULL;
  62         struct se_session *se_sess = se_cmd->se_sess;
  63         struct se_device *dev;
  64         unsigned long flags;
  65
  66         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  67                 return TCM_NON_EXISTENT_LUN;
  68
  69         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  70         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  71         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  72                 struct se_dev_entry *deve = se_cmd->se_deve;
  73
  74                 deve->total_cmds++;
  75
  76                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  77                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  78                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  79                                 " Access for 0x%08x\n",
  80                                 se_cmd->se_tfo->get_fabric_name(),
  81                                 unpacked_lun);
  82                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  83                         return TCM_WRITE_PROTECTED;
  84                 }
  85
  86                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  87                         deve->write_bytes += se_cmd->data_length;
  88                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  89                         deve->read_bytes += se_cmd->data_length;
  90
  91                 se_lun = deve->se_lun;
  92                 se_cmd->se_lun = deve->se_lun;
  93                 se_cmd->pr_res_key = deve->pr_res_key;
  94                 se_cmd->orig_fe_lun = unpacked_lun;
  95                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  96
  97                 percpu_ref_get(&se_lun->lun_ref);
  98                 se_cmd->lun_ref_active = true;
  99         }
 100         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 101
 102         if (!se_lun) {
 103                 /*
 104                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 105                  * REPORT_LUNS, et al to be returned when no active
 106                  * MappedLUN=0 exists for this Initiator Port.
 107                  */
 108                 if (unpacked_lun != 0) {
 109                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 110                                 " Access for 0x%08x\n",
 111                                 se_cmd->se_tfo->get_fabric_name(),
 112                                 unpacked_lun);
 113                         return TCM_NON_EXISTENT_LUN;
 114                 }
 115                 /*
 116                  * Force WRITE PROTECT for virtual LUN 0
 117                  */
 118                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 119                     (se_cmd->data_direction != DMA_NONE))
 120                         return TCM_WRITE_PROTECTED;
 121
 122                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 123                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 124                 se_cmd->orig_fe_lun = 0;
 125                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 126
 127                 percpu_ref_get(&se_lun->lun_ref);
 128                 se_cmd->lun_ref_active = true;
 129         }
 130
 131         /* Directly associate cmd with se_dev */
 132         se_cmd->se_dev = se_lun->lun_se_dev;
 133
 134         dev = se_lun->lun_se_dev;
 135         atomic_long_inc(&dev->num_cmds);
 136         if (se_cmd->data_direction == DMA_TO_DEVICE)
 137                 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
 138         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 139                 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
 140
 141         return 0;
 142 }
 143 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 144
 145 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 146 {
 147         struct se_dev_entry *deve;
 148         struct se_lun *se_lun = NULL;
 149         struct se_session *se_sess = se_cmd->se_sess;
 150         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 151         unsigned long flags;
 152
 153         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 154                 return -ENODEV;
 155
 156         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 157         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 158         deve = se_cmd->se_deve;
 159
 160         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 161                 se_tmr->tmr_lun = deve->se_lun;
 162                 se_cmd->se_lun = deve->se_lun;
 163                 se_lun = deve->se_lun;
 164                 se_cmd->pr_res_key = deve->pr_res_key;
 165                 se_cmd->orig_fe_lun = unpacked_lun;
 166         }
 167         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 168
 169         if (!se_lun) {
 170                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 171                         " Access for 0x%08x\n",
 172                         se_cmd->se_tfo->get_fabric_name(),
 173                         unpacked_lun);
 174                 return -ENODEV;
 175         }
 176
 177         /* Directly associate cmd with se_dev */
 178         se_cmd->se_dev = se_lun->lun_se_dev;
 179         se_tmr->tmr_dev = se_lun->lun_se_dev;
 180
 181         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 182         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 183         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 188
 189 /*
 190  * This function is called from core_scsi3_emulate_pro_register_and_move()
 191  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 192  * when a matching rtpi is found.
 193  */
 194 struct se_dev_entry *core_get_se_deve_from_rtpi(
 195         struct se_node_acl *nacl,
 196         u16 rtpi)
 197 {
 198         struct se_dev_entry *deve;
 199         struct se_lun *lun;
 200         struct se_port *port;
 201         struct se_portal_group *tpg = nacl->se_tpg;
 202         u32 i;
 203
 204         spin_lock_irq(&nacl->device_list_lock);
 205         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 206                 deve = nacl->device_list[i];
 207
 208                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 209                         continue;
 210
 211                 lun = deve->se_lun;
 212                 if (!lun) {
 213                         pr_err("%s device entries device pointer is"
 214                                 " NULL, but Initiator has access.\n",
 215                                 tpg->se_tpg_tfo->get_fabric_name());
 216                         continue;
 217                 }
 218                 port = lun->lun_sep;
 219                 if (!port) {
 220                         pr_err("%s device entries device pointer is"
 221                                 " NULL, but Initiator has access.\n",
 222                                 tpg->se_tpg_tfo->get_fabric_name());
 223                         continue;
 224                 }
 225                 if (port->sep_rtpi != rtpi)
 226                         continue;
 227
 228                 atomic_inc_mb(&deve->pr_ref_count);
 229                 spin_unlock_irq(&nacl->device_list_lock);
 230
 231                 return deve;
 232         }
 233         spin_unlock_irq(&nacl->device_list_lock);
 234
 235         return NULL;
 236 }
 237
 238 int core_free_device_list_for_node(
 239         struct se_node_acl *nacl,
 240         struct se_portal_group *tpg)
 241 {
 242         struct se_dev_entry *deve;
 243         struct se_lun *lun;
 244         u32 i;
 245
 246         if (!nacl->device_list)
 247                 return 0;
 248
 249         spin_lock_irq(&nacl->device_list_lock);
 250         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 251                 deve = nacl->device_list[i];
 252
 253                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 254                         continue;
 255
 256                 if (!deve->se_lun) {
 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                 lun = deve->se_lun;
 263
 264                 spin_unlock_irq(&nacl->device_list_lock);
 265                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 266                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 267                 spin_lock_irq(&nacl->device_list_lock);
 268         }
 269         spin_unlock_irq(&nacl->device_list_lock);
 270
 271         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 272         nacl->device_list = NULL;
 273
 274         return 0;
 275 }
 276
 277 void core_update_device_list_access(
 278         u32 mapped_lun,
 279         u32 lun_access,
 280         struct se_node_acl *nacl)
 281 {
 282         struct se_dev_entry *deve;
 283
 284         spin_lock_irq(&nacl->device_list_lock);
 285         deve = nacl->device_list[mapped_lun];
 286         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 287                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 288                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 289         } else {
 290                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 291                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 292         }
 293         spin_unlock_irq(&nacl->device_list_lock);
 294 }
 295
 296 /*      core_enable_device_list_for_node():
 297  *
 298  *
 299  */
 300 int core_enable_device_list_for_node(
 301         struct se_lun *lun,
 302         struct se_lun_acl *lun_acl,
 303         u32 mapped_lun,
 304         u32 lun_access,
 305         struct se_node_acl *nacl,
 306         struct se_portal_group *tpg)
 307 {
 308         struct se_port *port = lun->lun_sep;
 309         struct se_dev_entry *deve;
 310
 311         spin_lock_irq(&nacl->device_list_lock);
 312
 313         deve = nacl->device_list[mapped_lun];
 314
 315         /*
 316          * Check if the call is handling demo mode -> explicit LUN ACL
 317          * transition.  This transition must be for the same struct se_lun
 318          * + mapped_lun that was setup in demo mode..
 319          */
 320         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 321                 if (deve->se_lun_acl != NULL) {
 322                         pr_err("struct se_dev_entry->se_lun_acl"
 323                                " already set for demo mode -> explicit"
 324                                " LUN ACL transition\n");
 325                         spin_unlock_irq(&nacl->device_list_lock);
 326                         return -EINVAL;
 327                 }
 328                 if (deve->se_lun != lun) {
 329                         pr_err("struct se_dev_entry->se_lun does"
 330                                " match passed struct se_lun for demo mode"
 331                                " -> explicit LUN ACL transition\n");
 332                         spin_unlock_irq(&nacl->device_list_lock);
 333                         return -EINVAL;
 334                 }
 335                 deve->se_lun_acl = lun_acl;
 336
 337                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 338                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 339                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 340                 } else {
 341                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 342                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 343                 }
 344
 345                 spin_unlock_irq(&nacl->device_list_lock);
 346                 return 0;
 347         }
 348
 349         deve->se_lun = lun;
 350         deve->se_lun_acl = lun_acl;
 351         deve->mapped_lun = mapped_lun;
 352         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 353
 354         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 355                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 356                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 357         } else {
 358                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 359                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 360         }
 361
 362         deve->creation_time = get_jiffies_64();
 363         deve->attach_count++;
 364         spin_unlock_irq(&nacl->device_list_lock);
 365
 366         spin_lock_bh(&port->sep_alua_lock);
 367         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 368         spin_unlock_bh(&port->sep_alua_lock);
 369
 370         return 0;
 371 }
 372
 373 /*      core_disable_device_list_for_node():
 374  *
 375  *
 376  */
 377 int core_disable_device_list_for_node(
 378         struct se_lun *lun,
 379         struct se_lun_acl *lun_acl,
 380         u32 mapped_lun,
 381         u32 lun_access,
 382         struct se_node_acl *nacl,
 383         struct se_portal_group *tpg)
 384 {
 385         struct se_port *port = lun->lun_sep;
 386         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 387
 388         /*
 389          * If the MappedLUN entry is being disabled, the entry in
 390          * port->sep_alua_list must be removed now before clearing the
 391          * struct se_dev_entry pointers below as logic in
 392          * core_alua_do_transition_tg_pt() depends on these being present.
 393          *
 394          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 395          * that have not been explicitly converted to MappedLUNs ->
 396          * struct se_lun_acl, but we remove deve->alua_port_list from
 397          * port->sep_alua_list. This also means that active UAs and
 398          * NodeACL context specific PR metadata for demo-mode
 399          * MappedLUN *deve will be released below..
 400          */
 401         spin_lock_bh(&port->sep_alua_lock);
 402         list_del(&deve->alua_port_list);
 403         spin_unlock_bh(&port->sep_alua_lock);
 404         /*
 405          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 406          * PR operation to complete.
 407          */
 408         while (atomic_read(&deve->pr_ref_count) != 0)
 409                 cpu_relax();
 410
 411         spin_lock_irq(&nacl->device_list_lock);
 412         /*
 413          * Disable struct se_dev_entry LUN ACL mapping
 414          */
 415         core_scsi3_ua_release_all(deve);
 416         deve->se_lun = NULL;
 417         deve->se_lun_acl = NULL;
 418         deve->lun_flags = 0;
 419         deve->creation_time = 0;
 420         deve->attach_count--;
 421         spin_unlock_irq(&nacl->device_list_lock);
 422
 423         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 424         return 0;
 425 }
 426
 427 /*      core_clear_lun_from_tpg():
 428  *
 429  *
 430  */
 431 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 432 {
 433         struct se_node_acl *nacl;
 434         struct se_dev_entry *deve;
 435         u32 i;
 436
 437         spin_lock_irq(&tpg->acl_node_lock);
 438         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 439                 spin_unlock_irq(&tpg->acl_node_lock);
 440
 441                 spin_lock_irq(&nacl->device_list_lock);
 442                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 443                         deve = nacl->device_list[i];
 444                         if (lun != deve->se_lun)
 445                                 continue;
 446                         spin_unlock_irq(&nacl->device_list_lock);
 447
 448                         core_disable_device_list_for_node(lun, NULL,
 449                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 450                                 nacl, tpg);
 451
 452                         spin_lock_irq(&nacl->device_list_lock);
 453                 }
 454                 spin_unlock_irq(&nacl->device_list_lock);
 455
 456                 spin_lock_irq(&tpg->acl_node_lock);
 457         }
 458         spin_unlock_irq(&tpg->acl_node_lock);
 459 }
 460
 461 static struct se_port *core_alloc_port(struct se_device *dev)
 462 {
 463         struct se_port *port, *port_tmp;
 464
 465         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 466         if (!port) {
 467                 pr_err("Unable to allocate struct se_port\n");
 468                 return ERR_PTR(-ENOMEM);
 469         }
 470         INIT_LIST_HEAD(&port->sep_alua_list);
 471         INIT_LIST_HEAD(&port->sep_list);
 472         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 473         spin_lock_init(&port->sep_alua_lock);
 474         mutex_init(&port->sep_tg_pt_md_mutex);
 475
 476         spin_lock(&dev->se_port_lock);
 477         if (dev->dev_port_count == 0x0000ffff) {
 478                 pr_warn("Reached dev->dev_port_count =="
 479                                 " 0x0000ffff\n");
 480                 spin_unlock(&dev->se_port_lock);
 481                 return ERR_PTR(-ENOSPC);
 482         }
 483 again:
 484         /*
 485          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 486          * Here is the table from spc4r17 section 7.7.3.8.
 487          *
 488          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 489          *
 490          * Code      Description
 491          * 0h        Reserved
 492          * 1h        Relative port 1, historically known as port A
 493          * 2h        Relative port 2, historically known as port B
 494          * 3h to FFFFh    Relative port 3 through 65 535
 495          */
 496         port->sep_rtpi = dev->dev_rpti_counter++;
 497         if (!port->sep_rtpi)
 498                 goto again;
 499
 500         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 501                 /*
 502                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 503                  * for 16-bit wrap..
 504                  */
 505                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 506                         goto again;
 507         }
 508         spin_unlock(&dev->se_port_lock);
 509
 510         return port;
 511 }
 512
 513 static void core_export_port(
 514         struct se_device *dev,
 515         struct se_portal_group *tpg,
 516         struct se_port *port,
 517         struct se_lun *lun)
 518 {
 519         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 520
 521         spin_lock(&dev->se_port_lock);
 522         spin_lock(&lun->lun_sep_lock);
 523         port->sep_tpg = tpg;
 524         port->sep_lun = lun;
 525         lun->lun_sep = port;
 526         spin_unlock(&lun->lun_sep_lock);
 527
 528         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 529         spin_unlock(&dev->se_port_lock);
 530
 531         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
 532             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 533                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 534                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 535                         pr_err("Unable to allocate t10_alua_tg_pt"
 536                                         "_gp_member_t\n");
 537                         return;
 538                 }
 539                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 540                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 541                         dev->t10_alua.default_tg_pt_gp);
 542                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 543                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 544                         " Group: alua/default_tg_pt_gp\n",
 545                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 546         }
 547
 548         dev->dev_port_count++;
 549         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 550 }
 551
 552 /*
 553  *      Called with struct se_device->se_port_lock spinlock held.
 554  */
 555 static void core_release_port(struct se_device *dev, struct se_port *port)
 556         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 557 {
 558         /*
 559          * Wait for any port reference for PR ALL_TG_PT=1 operation
 560          * to complete in __core_scsi3_alloc_registration()
 561          */
 562         spin_unlock(&dev->se_port_lock);
 563         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 564                 cpu_relax();
 565         spin_lock(&dev->se_port_lock);
 566
 567         core_alua_free_tg_pt_gp_mem(port);
 568
 569         list_del(&port->sep_list);
 570         dev->dev_port_count--;
 571         kfree(port);
 572 }
 573
 574 int core_dev_export(
 575         struct se_device *dev,
 576         struct se_portal_group *tpg,
 577         struct se_lun *lun)
 578 {
 579         struct se_hba *hba = dev->se_hba;
 580         struct se_port *port;
 581
 582         port = core_alloc_port(dev);
 583         if (IS_ERR(port))
 584                 return PTR_ERR(port);
 585
 586         lun->lun_se_dev = dev;
 587
 588         spin_lock(&hba->device_lock);
 589         dev->export_count++;
 590         spin_unlock(&hba->device_lock);
 591
 592         core_export_port(dev, tpg, port, lun);
 593         return 0;
 594 }
 595
 596 void core_dev_unexport(
 597         struct se_device *dev,
 598         struct se_portal_group *tpg,
 599         struct se_lun *lun)
 600 {
 601         struct se_hba *hba = dev->se_hba;
 602         struct se_port *port = lun->lun_sep;
 603
 604         spin_lock(&lun->lun_sep_lock);
 605         if (lun->lun_se_dev == NULL) {
 606                 spin_unlock(&lun->lun_sep_lock);
 607                 return;
 608         }
 609         spin_unlock(&lun->lun_sep_lock);
 610
 611         spin_lock(&dev->se_port_lock);
 612         core_release_port(dev, port);
 613         spin_unlock(&dev->se_port_lock);
 614
 615         spin_lock(&hba->device_lock);
 616         dev->export_count--;
 617         spin_unlock(&hba->device_lock);
 618
 619         lun->lun_sep = NULL;
 620         lun->lun_se_dev = NULL;
 621 }
 622
 623 static void se_release_vpd_for_dev(struct se_device *dev)
 624 {
 625         struct t10_vpd *vpd, *vpd_tmp;
 626
 627         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 628         list_for_each_entry_safe(vpd, vpd_tmp,
 629                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 630                 list_del(&vpd->vpd_list);
 631                 kfree(vpd);
 632         }
 633         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 634 }
 635
 636 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 637 {
 638         u32 aligned_max_sectors;
 639         u32 alignment;
 640         /*
 641          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 642          * transport_allocate_data_tasks() operation.
 643          */
 644         alignment = max(1ul, PAGE_SIZE / block_size);
 645         aligned_max_sectors = rounddown(max_sectors, alignment);
 646
 647         if (max_sectors != aligned_max_sectors)
 648                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 649                         max_sectors, aligned_max_sectors);
 650
 651         return aligned_max_sectors;
 652 }
 653
 654 bool se_dev_check_wce(struct se_device *dev)
 655 {
 656         bool wce = false;
 657
 658         if (dev->transport->get_write_cache)
 659                 wce = dev->transport->get_write_cache(dev);
 660         else if (dev->dev_attrib.emulate_write_cache > 0)
 661                 wce = true;
 662
 663         return wce;
 664 }
 665
 666 int se_dev_set_max_unmap_lba_count(
 667         struct se_device *dev,
 668         u32 max_unmap_lba_count)
 669 {
 670         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 671         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 672                         dev, dev->dev_attrib.max_unmap_lba_count);
 673         return 0;
 674 }
 675 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
 676
 677 int se_dev_set_max_unmap_block_desc_count(
 678         struct se_device *dev,
 679         u32 max_unmap_block_desc_count)
 680 {
 681         dev->dev_attrib.max_unmap_block_desc_count =
 682                 max_unmap_block_desc_count;
 683         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 684                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 685         return 0;
 686 }
 687 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
 688
 689 int se_dev_set_unmap_granularity(
 690         struct se_device *dev,
 691         u32 unmap_granularity)
 692 {
 693         dev->dev_attrib.unmap_granularity = unmap_granularity;
 694         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 695                         dev, dev->dev_attrib.unmap_granularity);
 696         return 0;
 697 }
 698 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
 699
 700 int se_dev_set_unmap_granularity_alignment(
 701         struct se_device *dev,
 702         u32 unmap_granularity_alignment)
 703 {
 704         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 705         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 706                         dev, dev->dev_attrib.unmap_granularity_alignment);
 707         return 0;
 708 }
 709 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
 710
 711 int se_dev_set_max_write_same_len(
 712         struct se_device *dev,
 713         u32 max_write_same_len)
 714 {
 715         dev->dev_attrib.max_write_same_len = max_write_same_len;
 716         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 717                         dev, dev->dev_attrib.max_write_same_len);
 718         return 0;
 719 }
 720 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
 721
 722 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 723 {
 724         const char *configname;
 725
 726         configname = config_item_name(&dev->dev_group.cg_item);
 727         if (strlen(configname) >= 16) {
 728                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 729                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 730                         configname);
 731         }
 732         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 733 }
 734
 735 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 736 {
 737         if (dev->export_count) {
 738                 pr_err("dev[%p]: Unable to change model alias"
 739                         " while export_count is %d\n",
 740                         dev, dev->export_count);
 741                         return -EINVAL;
 742         }
 743
 744         if (flag != 0 && flag != 1) {
 745                 pr_err("Illegal value %d\n", flag);
 746                 return -EINVAL;
 747         }
 748
 749         if (flag) {
 750                 dev_set_t10_wwn_model_alias(dev);
 751         } else {
 752                 strncpy(&dev->t10_wwn.model[0],
 753                         dev->transport->inquiry_prod, 16);
 754         }
 755         dev->dev_attrib.emulate_model_alias = flag;
 756
 757         return 0;
 758 }
 759 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
 760
 761 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 762 {
 763         if (flag != 0 && flag != 1) {
 764                 pr_err("Illegal value %d\n", flag);
 765                 return -EINVAL;
 766         }
 767
 768         if (flag) {
 769                 pr_err("dpo_emulated not supported\n");
 770                 return -EINVAL;
 771         }
 772
 773         return 0;
 774 }
 775 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
 776
 777 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 778 {
 779         if (flag != 0 && flag != 1) {
 780                 pr_err("Illegal value %d\n", flag);
 781                 return -EINVAL;
 782         }
 783         if (flag &&
 784             dev->transport->get_write_cache) {
 785                 pr_warn("emulate_fua_write not supported for this device, ignoring\n");
 786                 return 0;
 787         }
 788         if (dev->export_count) {
 789                 pr_err("emulate_fua_write cannot be changed with active"
 790                        " exports: %d\n", dev->export_count);
 791                 return -EINVAL;
 792         }
 793         dev->dev_attrib.emulate_fua_write = flag;
 794         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 795                         dev, dev->dev_attrib.emulate_fua_write);
 796         return 0;
 797 }
 798 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
 799
 800 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 801 {
 802         if (flag != 0 && flag != 1) {
 803                 pr_err("Illegal value %d\n", flag);
 804                 return -EINVAL;
 805         }
 806
 807         if (flag) {
 808                 pr_err("ua read emulated not supported\n");
 809                 return -EINVAL;
 810         }
 811
 812         return 0;
 813 }
 814 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
 815
 816 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 817 {
 818         if (flag != 0 && flag != 1) {
 819                 pr_err("Illegal value %d\n", flag);
 820                 return -EINVAL;
 821         }
 822         if (flag &&
 823             dev->transport->get_write_cache) {
 824                 pr_err("emulate_write_cache not supported for this device\n");
 825                 return -EINVAL;
 826         }
 827         if (dev->export_count) {
 828                 pr_err("emulate_write_cache cannot be changed with active"
 829                        " exports: %d\n", dev->export_count);
 830                 return -EINVAL;
 831         }
 832         dev->dev_attrib.emulate_write_cache = flag;
 833         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 834                         dev, dev->dev_attrib.emulate_write_cache);
 835         return 0;
 836 }
 837 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
 838
 839 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 840 {
 841         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 842                 pr_err("Illegal value %d\n", flag);
 843                 return -EINVAL;
 844         }
 845
 846         if (dev->export_count) {
 847                 pr_err("dev[%p]: Unable to change SE Device"
 848                         " UA_INTRLCK_CTRL while export_count is %d\n",
 849                         dev, dev->export_count);
 850                 return -EINVAL;
 851         }
 852         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 853         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 854                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 855
 856         return 0;
 857 }
 858 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
 859
 860 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 861 {
 862         if ((flag != 0) && (flag != 1)) {
 863                 pr_err("Illegal value %d\n", flag);
 864                 return -EINVAL;
 865         }
 866
 867         if (dev->export_count) {
 868                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 869                         " export_count is %d\n",
 870                         dev, dev->export_count);
 871                 return -EINVAL;
 872         }
 873         dev->dev_attrib.emulate_tas = flag;
 874         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 875                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 876
 877         return 0;
 878 }
 879 EXPORT_SYMBOL(se_dev_set_emulate_tas);
 880
 881 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 882 {
 883         if ((flag != 0) && (flag != 1)) {
 884                 pr_err("Illegal value %d\n", flag);
 885                 return -EINVAL;
 886         }
 887         /*
 888          * We expect this value to be non-zero when generic Block Layer
 889          * Discard supported is detected iblock_create_virtdevice().
 890          */
 891         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 892                 pr_err("Generic Block Discard not supported\n");
 893                 return -ENOSYS;
 894         }
 895
 896         dev->dev_attrib.emulate_tpu = flag;
 897         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 898                                 dev, flag);
 899         return 0;
 900 }
 901 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
 902
 903 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 904 {
 905         if ((flag != 0) && (flag != 1)) {
 906                 pr_err("Illegal value %d\n", flag);
 907                 return -EINVAL;
 908         }
 909         /*
 910          * We expect this value to be non-zero when generic Block Layer
 911          * Discard supported is detected iblock_create_virtdevice().
 912          */
 913         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 914                 pr_err("Generic Block Discard not supported\n");
 915                 return -ENOSYS;
 916         }
 917
 918         dev->dev_attrib.emulate_tpws = flag;
 919         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 920                                 dev, flag);
 921         return 0;
 922 }
 923 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
 924
 925 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
 926 {
 927         if (flag != 0 && flag != 1) {
 928                 pr_err("Illegal value %d\n", flag);
 929                 return -EINVAL;
 930         }
 931         dev->dev_attrib.emulate_caw = flag;
 932         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
 933                  dev, flag);
 934
 935         return 0;
 936 }
 937 EXPORT_SYMBOL(se_dev_set_emulate_caw);
 938
 939 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
 940 {
 941         if (flag != 0 && flag != 1) {
 942                 pr_err("Illegal value %d\n", flag);
 943                 return -EINVAL;
 944         }
 945         dev->dev_attrib.emulate_3pc = flag;
 946         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
 947                 dev, flag);
 948
 949         return 0;
 950 }
 951 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
 952
 953 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
 954 {
 955         int rc, old_prot = dev->dev_attrib.pi_prot_type;
 956
 957         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 958                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 959                 return -EINVAL;
 960         }
 961         if (flag == 2) {
 962                 pr_err("DIF TYPE2 protection currently not supported\n");
 963                 return -ENOSYS;
 964         }
 965         if (dev->dev_attrib.hw_pi_prot_type) {
 966                 pr_warn("DIF protection enabled on underlying hardware,"
 967                         " ignoring\n");
 968                 return 0;
 969         }
 970         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 971                 /* 0 is only allowed value for non-supporting backends */
 972                 if (flag == 0)
 973                         return 0;
 974
 975                 pr_err("DIF protection not supported by backend: %s\n",
 976                        dev->transport->name);
 977                 return -ENOSYS;
 978         }
 979         if (!(dev->dev_flags & DF_CONFIGURED)) {
 980                 pr_err("DIF protection requires device to be configured\n");
 981                 return -ENODEV;
 982         }
 983         if (dev->export_count) {
 984                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 985                        " export_count is %d\n", dev, dev->export_count);
 986                 return -EINVAL;
 987         }
 988
 989         dev->dev_attrib.pi_prot_type = flag;
 990
 991         if (flag && !old_prot) {
 992                 rc = dev->transport->init_prot(dev);
 993                 if (rc) {
 994                         dev->dev_attrib.pi_prot_type = old_prot;
 995                         return rc;
 996                 }
 997
 998         } else if (!flag && old_prot) {
 999                 dev->transport->free_prot(dev);
1000         }
1001         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
1002
1003         return 0;
1004 }
1005 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
1006
1007 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
1008 {
1009         int rc;
1010
1011         if (!flag)
1012                 return 0;
1013
1014         if (flag != 1) {
1015                 pr_err("Illegal value %d for pi_prot_format\n", flag);
1016                 return -EINVAL;
1017         }
1018         if (!dev->transport->format_prot) {
1019                 pr_err("DIF protection format not supported by backend %s\n",
1020                        dev->transport->name);
1021                 return -ENOSYS;
1022         }
1023         if (!(dev->dev_flags & DF_CONFIGURED)) {
1024                 pr_err("DIF protection format requires device to be configured\n");
1025                 return -ENODEV;
1026         }
1027         if (dev->export_count) {
1028                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1029                        " export_count is %d\n", dev, dev->export_count);
1030                 return -EINVAL;
1031         }
1032
1033         rc = dev->transport->format_prot(dev);
1034         if (rc)
1035                 return rc;
1036
1037         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1038
1039         return 0;
1040 }
1041 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1042
1043 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1044 {
1045         if ((flag != 0) && (flag != 1)) {
1046                 pr_err("Illegal value %d\n", flag);
1047                 return -EINVAL;
1048         }
1049         dev->dev_attrib.enforce_pr_isids = flag;
1050         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1051                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1052         return 0;
1053 }
1054 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1055
1056 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1057 {
1058         if ((flag != 0) && (flag != 1)) {
1059                 printk(KERN_ERR "Illegal value %d\n", flag);
1060                 return -EINVAL;
1061         }
1062         if (dev->export_count) {
1063                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1064                        " export_count is %d\n", dev, dev->export_count);
1065                 return -EINVAL;
1066         }
1067
1068         dev->dev_attrib.force_pr_aptpl = flag;
1069         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1070         return 0;
1071 }
1072 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1073
1074 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1075 {
1076         if ((flag != 0) && (flag != 1)) {
1077                 printk(KERN_ERR "Illegal value %d\n", flag);
1078                 return -EINVAL;
1079         }
1080         dev->dev_attrib.is_nonrot = flag;
1081         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1082                dev, flag);
1083         return 0;
1084 }
1085 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1086
1087 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1088 {
1089         if (flag != 0) {
1090                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1091                         " reordering not implemented\n", dev);
1092                 return -ENOSYS;
1093         }
1094         dev->dev_attrib.emulate_rest_reord = flag;
1095         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1096         return 0;
1097 }
1098 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1099
1100 /*
1101  * Note, this can only be called on unexported SE Device Object.
1102  */
1103 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1104 {
1105         if (dev->export_count) {
1106                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1107                         " export_count is %d\n",
1108                         dev, dev->export_count);
1109                 return -EINVAL;
1110         }
1111         if (!queue_depth) {
1112                 pr_err("dev[%p]: Illegal ZERO value for queue"
1113                         "_depth\n", dev);
1114                 return -EINVAL;
1115         }
1116
1117         if (queue_depth > dev->dev_attrib.queue_depth) {
1118                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1119                         pr_err("dev[%p]: Passed queue_depth:"
1120                                 " %u exceeds TCM/SE_Device MAX"
1121                                 " TCQ: %u\n", dev, queue_depth,
1122                                 dev->dev_attrib.hw_queue_depth);
1123                         return -EINVAL;
1124                 }
1125         }
1126         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1127         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1128                         dev, queue_depth);
1129         return 0;
1130 }
1131 EXPORT_SYMBOL(se_dev_set_queue_depth);
1132
1133 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1134 {
1135         if (dev->export_count) {
1136                 pr_err("dev[%p]: Unable to change SE Device"
1137                         " optimal_sectors while export_count is %d\n",
1138                         dev, dev->export_count);
1139                 return -EINVAL;
1140         }
1141         if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1142                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1143                         " greater than hw_max_sectors: %u\n", dev,
1144                         optimal_sectors, dev->dev_attrib.hw_max_sectors);
1145                 return -EINVAL;
1146         }
1147
1148         dev->dev_attrib.optimal_sectors = optimal_sectors;
1149         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1150                         dev, optimal_sectors);
1151         return 0;
1152 }
1153 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1154
1155 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1156 {
1157         if (dev->export_count) {
1158                 pr_err("dev[%p]: Unable to change SE Device block_size"
1159                         " while export_count is %d\n",
1160                         dev, dev->export_count);
1161                 return -EINVAL;
1162         }
1163
1164         if ((block_size != 512) &&
1165             (block_size != 1024) &&
1166             (block_size != 2048) &&
1167             (block_size != 4096)) {
1168                 pr_err("dev[%p]: Illegal value for block_device: %u"
1169                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1170                         dev, block_size);
1171                 return -EINVAL;
1172         }
1173
1174         dev->dev_attrib.block_size = block_size;
1175         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1176                         dev, block_size);
1177
1178         if (dev->dev_attrib.max_bytes_per_io)
1179                 dev->dev_attrib.hw_max_sectors =
1180                         dev->dev_attrib.max_bytes_per_io / block_size;
1181
1182         return 0;
1183 }
1184 EXPORT_SYMBOL(se_dev_set_block_size);
1185
1186 struct se_lun *core_dev_add_lun(
1187         struct se_portal_group *tpg,
1188         struct se_device *dev,
1189         u32 unpacked_lun)
1190 {
1191         struct se_lun *lun;
1192         int rc;
1193
1194         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1195         if (IS_ERR(lun))
1196                 return lun;
1197
1198         rc = core_tpg_add_lun(tpg, lun,
1199                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1200         if (rc < 0)
1201                 return ERR_PTR(rc);
1202
1203         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1204                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1205                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1206                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1207         /*
1208          * Update LUN maps for dynamically added initiators when
1209          * generate_node_acl is enabled.
1210          */
1211         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1212                 struct se_node_acl *acl;
1213                 spin_lock_irq(&tpg->acl_node_lock);
1214                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1215                         if (acl->dynamic_node_acl &&
1216                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1217                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1218                                 spin_unlock_irq(&tpg->acl_node_lock);
1219                                 core_tpg_add_node_to_devs(acl, tpg);
1220                                 spin_lock_irq(&tpg->acl_node_lock);
1221                         }
1222                 }
1223                 spin_unlock_irq(&tpg->acl_node_lock);
1224         }
1225
1226         return lun;
1227 }
1228
1229 /*      core_dev_del_lun():
1230  *
1231  *
1232  */
1233 void core_dev_del_lun(
1234         struct se_portal_group *tpg,
1235         struct se_lun *lun)
1236 {
1237         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1238                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1239                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1240                 tpg->se_tpg_tfo->get_fabric_name());
1241
1242         core_tpg_remove_lun(tpg, lun);
1243 }
1244
1245 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1246 {
1247         struct se_lun *lun;
1248
1249         spin_lock(&tpg->tpg_lun_lock);
1250         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1251                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1252                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1253                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1254                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1255                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1256                 spin_unlock(&tpg->tpg_lun_lock);
1257                 return NULL;
1258         }
1259         lun = tpg->tpg_lun_list[unpacked_lun];
1260
1261         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1262                 pr_err("%s Logical Unit Number: %u is not free on"
1263                         " Target Portal Group: %hu, ignoring request.\n",
1264                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1265                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1266                 spin_unlock(&tpg->tpg_lun_lock);
1267                 return NULL;
1268         }
1269         spin_unlock(&tpg->tpg_lun_lock);
1270
1271         return lun;
1272 }
1273
1274 /*      core_dev_get_lun():
1275  *
1276  *
1277  */
1278 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1279 {
1280         struct se_lun *lun;
1281
1282         spin_lock(&tpg->tpg_lun_lock);
1283         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1284                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1285                         "_TPG-1: %u for Target Portal Group: %hu\n",
1286                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1287                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1288                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1289                 spin_unlock(&tpg->tpg_lun_lock);
1290                 return NULL;
1291         }
1292         lun = tpg->tpg_lun_list[unpacked_lun];
1293
1294         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1295                 pr_err("%s Logical Unit Number: %u is not active on"
1296                         " Target Portal Group: %hu, ignoring request.\n",
1297                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1298                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1299                 spin_unlock(&tpg->tpg_lun_lock);
1300                 return NULL;
1301         }
1302         spin_unlock(&tpg->tpg_lun_lock);
1303
1304         return lun;
1305 }
1306
1307 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1308         struct se_portal_group *tpg,
1309         struct se_node_acl *nacl,
1310         u32 mapped_lun,
1311         int *ret)
1312 {
1313         struct se_lun_acl *lacl;
1314
1315         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1316                 pr_err("%s InitiatorName exceeds maximum size.\n",
1317                         tpg->se_tpg_tfo->get_fabric_name());
1318                 *ret = -EOVERFLOW;
1319                 return NULL;
1320         }
1321         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1322         if (!lacl) {
1323                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1324                 *ret = -ENOMEM;
1325                 return NULL;
1326         }
1327
1328         INIT_LIST_HEAD(&lacl->lacl_list);
1329         lacl->mapped_lun = mapped_lun;
1330         lacl->se_lun_nacl = nacl;
1331         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1332                  nacl->initiatorname);
1333
1334         return lacl;
1335 }
1336
1337 int core_dev_add_initiator_node_lun_acl(
1338         struct se_portal_group *tpg,
1339         struct se_lun_acl *lacl,
1340         u32 unpacked_lun,
1341         u32 lun_access)
1342 {
1343         struct se_lun *lun;
1344         struct se_node_acl *nacl;
1345
1346         lun = core_dev_get_lun(tpg, unpacked_lun);
1347         if (!lun) {
1348                 pr_err("%s Logical Unit Number: %u is not active on"
1349                         " Target Portal Group: %hu, ignoring request.\n",
1350                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1351                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1352                 return -EINVAL;
1353         }
1354
1355         nacl = lacl->se_lun_nacl;
1356         if (!nacl)
1357                 return -EINVAL;
1358
1359         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1360             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1361                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1362
1363         lacl->se_lun = lun;
1364
1365         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1366                         lun_access, nacl, tpg) < 0)
1367                 return -EINVAL;
1368
1369         spin_lock(&lun->lun_acl_lock);
1370         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1371         atomic_inc_mb(&lun->lun_acl_count);
1372         spin_unlock(&lun->lun_acl_lock);
1373
1374         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1375                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1376                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1377                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1378                 lacl->initiatorname);
1379         /*
1380          * Check to see if there are any existing persistent reservation APTPL
1381          * pre-registrations that need to be enabled for this LUN ACL..
1382          */
1383         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1384                                             lacl->mapped_lun);
1385         return 0;
1386 }
1387
1388 /*      core_dev_del_initiator_node_lun_acl():
1389  *
1390  *
1391  */
1392 int core_dev_del_initiator_node_lun_acl(
1393         struct se_portal_group *tpg,
1394         struct se_lun *lun,
1395         struct se_lun_acl *lacl)
1396 {
1397         struct se_node_acl *nacl;
1398
1399         nacl = lacl->se_lun_nacl;
1400         if (!nacl)
1401                 return -EINVAL;
1402
1403         spin_lock(&lun->lun_acl_lock);
1404         list_del(&lacl->lacl_list);
1405         atomic_dec_mb(&lun->lun_acl_count);
1406         spin_unlock(&lun->lun_acl_lock);
1407
1408         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1409                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1410
1411         lacl->se_lun = NULL;
1412
1413         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1414                 " InitiatorNode: %s Mapped LUN: %u\n",
1415                 tpg->se_tpg_tfo->get_fabric_name(),
1416                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1417                 lacl->initiatorname, lacl->mapped_lun);
1418
1419         return 0;
1420 }
1421
1422 void core_dev_free_initiator_node_lun_acl(
1423         struct se_portal_group *tpg,
1424         struct se_lun_acl *lacl)
1425 {
1426         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1427                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1428                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1429                 tpg->se_tpg_tfo->get_fabric_name(),
1430                 lacl->initiatorname, lacl->mapped_lun);
1431
1432         kfree(lacl);
1433 }
1434
1435 static void scsi_dump_inquiry(struct se_device *dev)
1436 {
1437         struct t10_wwn *wwn = &dev->t10_wwn;
1438         char buf[17];
1439         int i, device_type;
1440         /*
1441          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1442          */
1443         for (i = 0; i < 8; i++)
1444                 if (wwn->vendor[i] >= 0x20)
1445                         buf[i] = wwn->vendor[i];
1446                 else
1447                         buf[i] = ' ';
1448         buf[i] = '\0';
1449         pr_debug("  Vendor: %s\n", buf);
1450
1451         for (i = 0; i < 16; i++)
1452                 if (wwn->model[i] >= 0x20)
1453                         buf[i] = wwn->model[i];
1454                 else
1455                         buf[i] = ' ';
1456         buf[i] = '\0';
1457         pr_debug("  Model: %s\n", buf);
1458
1459         for (i = 0; i < 4; i++)
1460                 if (wwn->revision[i] >= 0x20)
1461                         buf[i] = wwn->revision[i];
1462                 else
1463                         buf[i] = ' ';
1464         buf[i] = '\0';
1465         pr_debug("  Revision: %s\n", buf);
1466
1467         device_type = dev->transport->get_device_type(dev);
1468         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1469 }
1470
1471 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1472 {
1473         struct se_device *dev;
1474         struct se_lun *xcopy_lun;
1475
1476         dev = hba->transport->alloc_device(hba, name);
1477         if (!dev)
1478                 return NULL;
1479
1480         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1481         dev->se_hba = hba;
1482         dev->transport = hba->transport;
1483         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1484
1485         INIT_LIST_HEAD(&dev->dev_list);
1486         INIT_LIST_HEAD(&dev->dev_sep_list);
1487         INIT_LIST_HEAD(&dev->dev_tmr_list);
1488         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1489         INIT_LIST_HEAD(&dev->state_list);
1490         INIT_LIST_HEAD(&dev->qf_cmd_list);
1491         INIT_LIST_HEAD(&dev->g_dev_node);
1492         spin_lock_init(&dev->execute_task_lock);
1493         spin_lock_init(&dev->delayed_cmd_lock);
1494         spin_lock_init(&dev->dev_reservation_lock);
1495         spin_lock_init(&dev->se_port_lock);
1496         spin_lock_init(&dev->se_tmr_lock);
1497         spin_lock_init(&dev->qf_cmd_lock);
1498         sema_init(&dev->caw_sem, 1);
1499         atomic_set(&dev->dev_ordered_id, 0);
1500         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1501         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1502         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1503         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1504         spin_lock_init(&dev->t10_pr.registration_lock);
1505         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1506         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1507         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1508         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1509         spin_lock_init(&dev->t10_alua.lba_map_lock);
1510
1511         dev->t10_wwn.t10_dev = dev;
1512         dev->t10_alua.t10_dev = dev;
1513
1514         dev->dev_attrib.da_dev = dev;
1515         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1516         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1517         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1518         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1519         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1520         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1521         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1522         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1523         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1524         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1525         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1526         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1527         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1528         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1529         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1530         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1531         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1532         dev->dev_attrib.max_unmap_block_desc_count =
1533                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1534         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1535         dev->dev_attrib.unmap_granularity_alignment =
1536                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1537         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1538
1539         xcopy_lun = &dev->xcopy_lun;
1540         xcopy_lun->lun_se_dev = dev;
1541         init_completion(&xcopy_lun->lun_shutdown_comp);
1542         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1543         spin_lock_init(&xcopy_lun->lun_acl_lock);
1544         spin_lock_init(&xcopy_lun->lun_sep_lock);
1545         init_completion(&xcopy_lun->lun_ref_comp);
1546
1547         return dev;
1548 }
1549
1550 int target_configure_device(struct se_device *dev)
1551 {
1552         struct se_hba *hba = dev->se_hba;
1553         int ret;
1554
1555         if (dev->dev_flags & DF_CONFIGURED) {
1556                 pr_err("se_dev->se_dev_ptr already set for storage"
1557                                 " object\n");
1558                 return -EEXIST;
1559         }
1560
1561         ret = dev->transport->configure_device(dev);
1562         if (ret)
1563                 goto out;
1564         /*
1565          * XXX: there is not much point to have two different values here..
1566          */
1567         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1568         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1569
1570         /*
1571          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1572          */
1573         dev->dev_attrib.hw_max_sectors =
1574                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1575                                          dev->dev_attrib.hw_block_size);
1576         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1577
1578         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1579         dev->creation_time = get_jiffies_64();
1580
1581         ret = core_setup_alua(dev);
1582         if (ret)
1583                 goto out;
1584
1585         /*
1586          * Startup the struct se_device processing thread
1587          */
1588         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1589                                       dev->transport->name);
1590         if (!dev->tmr_wq) {
1591                 pr_err("Unable to create tmr workqueue for %s\n",
1592                         dev->transport->name);
1593                 ret = -ENOMEM;
1594                 goto out_free_alua;
1595         }
1596
1597         /*
1598          * Setup work_queue for QUEUE_FULL
1599          */
1600         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1601
1602         /*
1603          * Preload the initial INQUIRY const values if we are doing
1604          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1605          * passthrough because this is being provided by the backend LLD.
1606          */
1607         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1608                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1609                 strncpy(&dev->t10_wwn.model[0],
1610                         dev->transport->inquiry_prod, 16);
1611                 strncpy(&dev->t10_wwn.revision[0],
1612                         dev->transport->inquiry_rev, 4);
1613         }
1614
1615         scsi_dump_inquiry(dev);
1616
1617         spin_lock(&hba->device_lock);
1618         hba->dev_count++;
1619         spin_unlock(&hba->device_lock);
1620
1621         mutex_lock(&g_device_mutex);
1622         list_add_tail(&dev->g_dev_node, &g_device_list);
1623         mutex_unlock(&g_device_mutex);
1624
1625         dev->dev_flags |= DF_CONFIGURED;
1626
1627         return 0;
1628
1629 out_free_alua:
1630         core_alua_free_lu_gp_mem(dev);
1631 out:
1632         se_release_vpd_for_dev(dev);
1633         return ret;
1634 }
1635
1636 void target_free_device(struct se_device *dev)
1637 {
1638         struct se_hba *hba = dev->se_hba;
1639
1640         WARN_ON(!list_empty(&dev->dev_sep_list));
1641
1642         if (dev->dev_flags & DF_CONFIGURED) {
1643                 destroy_workqueue(dev->tmr_wq);
1644
1645                 mutex_lock(&g_device_mutex);
1646                 list_del(&dev->g_dev_node);
1647                 mutex_unlock(&g_device_mutex);
1648
1649                 spin_lock(&hba->device_lock);
1650                 hba->dev_count--;
1651                 spin_unlock(&hba->device_lock);
1652         }
1653
1654         core_alua_free_lu_gp_mem(dev);
1655         core_alua_set_lba_map(dev, NULL, 0, 0);
1656         core_scsi3_free_all_registrations(dev);
1657         se_release_vpd_for_dev(dev);
1658
1659         if (dev->transport->free_prot)
1660                 dev->transport->free_prot(dev);
1661
1662         dev->transport->free_device(dev);
1663 }
1664
1665 int core_dev_setup_virtual_lun0(void)
1666 {
1667         struct se_hba *hba;
1668         struct se_device *dev;
1669         char buf[] = "rd_pages=8,rd_nullio=1";
1670         int ret;
1671
1672         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1673         if (IS_ERR(hba))
1674                 return PTR_ERR(hba);
1675
1676         dev = target_alloc_device(hba, "virt_lun0");
1677         if (!dev) {
1678                 ret = -ENOMEM;
1679                 goto out_free_hba;
1680         }
1681
1682         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1683
1684         ret = target_configure_device(dev);
1685         if (ret)
1686                 goto out_free_se_dev;
1687
1688         lun0_hba = hba;
1689         g_lun0_dev = dev;
1690         return 0;
1691
1692 out_free_se_dev:
1693         target_free_device(dev);
1694 out_free_hba:
1695         core_delete_hba(hba);
1696         return ret;
1697 }
1698
1699
1700 void core_dev_release_virtual_lun0(void)
1701 {
1702         struct se_hba *hba = lun0_hba;
1703
1704         if (!hba)
1705                 return;
1706
1707         if (g_lun0_dev)
1708                 target_free_device(g_lun0_dev);
1709         core_delete_hba(hba);
1710 }
1711
1712 /*
1713  * Common CDB parsing for kernel and user passthrough.
1714  */
1715 sense_reason_t
1716 passthrough_parse_cdb(struct se_cmd *cmd,
1717         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1718 {
1719         unsigned char *cdb = cmd->t_task_cdb;
1720
1721         /*
1722          * Clear a lun set in the cdb if the initiator talking to use spoke
1723          * and old standards version, as we can't assume the underlying device
1724          * won't choke up on it.
1725          */
1726         switch (cdb[0]) {
1727         case READ_10: /* SBC - RDProtect */
1728         case READ_12: /* SBC - RDProtect */
1729         case READ_16: /* SBC - RDProtect */
1730         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1731         case VERIFY: /* SBC - VRProtect */
1732         case VERIFY_16: /* SBC - VRProtect */
1733         case WRITE_VERIFY: /* SBC - VRProtect */
1734         case WRITE_VERIFY_12: /* SBC - VRProtect */
1735         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1736                 break;
1737         default:
1738                 cdb[1] &= 0x1f; /* clear logical unit number */
1739                 break;
1740         }
1741
1742         /*
1743          * For REPORT LUNS we always need to emulate the response, for everything
1744          * else, pass it up.
1745          */
1746         if (cdb[0] == REPORT_LUNS) {
1747                 cmd->execute_cmd = spc_emulate_report_luns;
1748                 return TCM_NO_SENSE;
1749         }
1750
1751         /* Set DATA_CDB flag for ops that should have it */
1752         switch (cdb[0]) {
1753         case READ_6:
1754         case READ_10:
1755         case READ_12:
1756         case READ_16:
1757         case WRITE_6:
1758         case WRITE_10:
1759         case WRITE_12:
1760         case WRITE_16:
1761         case WRITE_VERIFY:
1762         case WRITE_VERIFY_12:
1763         case 0x8e: /* WRITE_VERIFY_16 */
1764         case COMPARE_AND_WRITE:
1765         case XDWRITEREAD_10:
1766                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1767                 break;
1768         case VARIABLE_LENGTH_CMD:
1769                 switch (get_unaligned_be16(&cdb[8])) {
1770                 case READ_32:
1771                 case WRITE_32:
1772                 case 0x0c: /* WRITE_VERIFY_32 */
1773                 case XDWRITEREAD_32:
1774                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1775                         break;
1776                 }
1777         }
1778
1779         cmd->execute_cmd = exec_cmd;
1780
1781         return TCM_NO_SENSE;
1782 }
1783 EXPORT_SYMBOL(passthrough_parse_cdb);