drivers/target/target_core_device.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   4  *
   5  * This file contains the TCM Virtual Device and Disk Transport
   6  * agnostic related functions.
   7  *
   8  * (c) Copyright 2003-2013 Datera, Inc.
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  ******************************************************************************/
  13
  14 #include <linux/net.h>
  15 #include <linux/string.h>
  16 #include <linux/delay.h>
  17 #include <linux/timer.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/kthread.h>
  21 #include <linux/in.h>
  22 #include <linux/export.h>
  23 #include <linux/t10-pi.h>
  24 #include <asm/unaligned.h>
  25 #include <net/sock.h>
  26 #include <net/tcp.h>
  27 #include <scsi/scsi_common.h>
  28 #include <scsi/scsi_proto.h>
  29
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_backend.h>
  32 #include <target/target_core_fabric.h>
  33
  34 #include "target_core_internal.h"
  35 #include "target_core_alua.h"
  36 #include "target_core_pr.h"
  37 #include "target_core_ua.h"
  38
  39 static DEFINE_MUTEX(device_mutex);
  40 static LIST_HEAD(device_list);
  41 static DEFINE_IDR(devices_idr);
  42
  43 static struct se_hba *lun0_hba;
  44 /* not static, needed by tpg.c */
  45 struct se_device *g_lun0_dev;
  46
  47 sense_reason_t
  48 transport_lookup_cmd_lun(struct se_cmd *se_cmd)
  49 {
  50         struct se_lun *se_lun = NULL;
  51         struct se_session *se_sess = se_cmd->se_sess;
  52         struct se_node_acl *nacl = se_sess->se_node_acl;
  53         struct se_dev_entry *deve;
  54         sense_reason_t ret = TCM_NO_SENSE;
  55
  56         rcu_read_lock();
  57         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
  58         if (deve) {
  59                 atomic_long_inc(&deve->total_cmds);
  60
  61                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  62                         atomic_long_add(se_cmd->data_length,
  63                                         &deve->write_bytes);
  64                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  65                         atomic_long_add(se_cmd->data_length,
  66                                         &deve->read_bytes);
  67
  68                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  69                     deve->lun_access_ro) {
  70                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  71                                 " Access for 0x%08llx\n",
  72                                 se_cmd->se_tfo->fabric_name,
  73                                 se_cmd->orig_fe_lun);
  74                         rcu_read_unlock();
  75                         return TCM_WRITE_PROTECTED;
  76                 }
  77
  78                 se_lun = deve->se_lun;
  79
  80                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  81                         se_lun = NULL;
  82                         goto out_unlock;
  83                 }
  84
  85                 se_cmd->se_lun = se_lun;
  86                 se_cmd->pr_res_key = deve->pr_res_key;
  87                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  88                 se_cmd->lun_ref_active = true;
  89         }
  90 out_unlock:
  91         rcu_read_unlock();
  92
  93         if (!se_lun) {
  94                 /*
  95                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  96                  * REPORT_LUNS, et al to be returned when no active
  97                  * MappedLUN=0 exists for this Initiator Port.
  98                  */
  99                 if (se_cmd->orig_fe_lun != 0) {
 100                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 101                                 " Access for 0x%08llx from %s\n",
 102                                 se_cmd->se_tfo->fabric_name,
 103                                 se_cmd->orig_fe_lun,
 104                                 nacl->initiatorname);
 105                         return TCM_NON_EXISTENT_LUN;
 106                 }
 107
 108                 /*
 109                  * Force WRITE PROTECT for virtual LUN 0
 110                  */
 111                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 112                     (se_cmd->data_direction != DMA_NONE))
 113                         return TCM_WRITE_PROTECTED;
 114
 115                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 116                 if (!percpu_ref_tryget_live(&se_lun->lun_ref))
 117                         return TCM_NON_EXISTENT_LUN;
 118
 119                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 120                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 121                 se_cmd->lun_ref_active = true;
 122         }
 123         /*
 124          * RCU reference protected by percpu se_lun->lun_ref taken above that
 125          * must drop to zero (including initial reference) before this se_lun
 126          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 127          * target_core_fabric_configfs.c:target_fabric_port_release
 128          */
 129         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 130         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 131
 132         if (se_cmd->data_direction == DMA_TO_DEVICE)
 133                 atomic_long_add(se_cmd->data_length,
 134                                 &se_cmd->se_dev->write_bytes);
 135         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 136                 atomic_long_add(se_cmd->data_length,
 137                                 &se_cmd->se_dev->read_bytes);
 138
 139         return ret;
 140 }
 141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 142
 143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
 144 {
 145         struct se_dev_entry *deve;
 146         struct se_lun *se_lun = NULL;
 147         struct se_session *se_sess = se_cmd->se_sess;
 148         struct se_node_acl *nacl = se_sess->se_node_acl;
 149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 150         unsigned long flags;
 151
 152         rcu_read_lock();
 153         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
 154         if (deve) {
 155                 se_lun = deve->se_lun;
 156
 157                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 158                         se_lun = NULL;
 159                         goto out_unlock;
 160                 }
 161
 162                 se_cmd->se_lun = se_lun;
 163                 se_cmd->pr_res_key = deve->pr_res_key;
 164                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 165                 se_cmd->lun_ref_active = true;
 166         }
 167 out_unlock:
 168         rcu_read_unlock();
 169
 170         if (!se_lun) {
 171                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 172                         " Access for 0x%08llx for %s\n",
 173                         se_cmd->se_tfo->fabric_name,
 174                         se_cmd->orig_fe_lun,
 175                         nacl->initiatorname);
 176                 return -ENODEV;
 177         }
 178         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 179         se_tmr->tmr_dev = rcu_dereference_raw(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 bool target_lun_is_rdonly(struct se_cmd *cmd)
 190 {
 191         struct se_session *se_sess = cmd->se_sess;
 192         struct se_dev_entry *deve;
 193         bool ret;
 194
 195         rcu_read_lock();
 196         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 197         ret = deve && deve->lun_access_ro;
 198         rcu_read_unlock();
 199
 200         return ret;
 201 }
 202 EXPORT_SYMBOL(target_lun_is_rdonly);
 203
 204 /*
 205  * This function is called from core_scsi3_emulate_pro_register_and_move()
 206  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 207  * when a matching rtpi is found.
 208  */
 209 struct se_dev_entry *core_get_se_deve_from_rtpi(
 210         struct se_node_acl *nacl,
 211         u16 rtpi)
 212 {
 213         struct se_dev_entry *deve;
 214         struct se_lun *lun;
 215         struct se_portal_group *tpg = nacl->se_tpg;
 216
 217         rcu_read_lock();
 218         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 219                 lun = deve->se_lun;
 220                 if (!lun) {
 221                         pr_err("%s device entries device pointer is"
 222                                 " NULL, but Initiator has access.\n",
 223                                 tpg->se_tpg_tfo->fabric_name);
 224                         continue;
 225                 }
 226                 if (lun->lun_rtpi != rtpi)
 227                         continue;
 228
 229                 kref_get(&deve->pr_kref);
 230                 rcu_read_unlock();
 231
 232                 return deve;
 233         }
 234         rcu_read_unlock();
 235
 236         return NULL;
 237 }
 238
 239 void core_free_device_list_for_node(
 240         struct se_node_acl *nacl,
 241         struct se_portal_group *tpg)
 242 {
 243         struct se_dev_entry *deve;
 244
 245         mutex_lock(&nacl->lun_entry_mutex);
 246         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 247                 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
 248         mutex_unlock(&nacl->lun_entry_mutex);
 249 }
 250
 251 void core_update_device_list_access(
 252         u64 mapped_lun,
 253         bool lun_access_ro,
 254         struct se_node_acl *nacl)
 255 {
 256         struct se_dev_entry *deve;
 257
 258         mutex_lock(&nacl->lun_entry_mutex);
 259         deve = target_nacl_find_deve(nacl, mapped_lun);
 260         if (deve)
 261                 deve->lun_access_ro = lun_access_ro;
 262         mutex_unlock(&nacl->lun_entry_mutex);
 263 }
 264
 265 /*
 266  * Called with rcu_read_lock or nacl->device_list_lock held.
 267  */
 268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 269 {
 270         struct se_dev_entry *deve;
 271
 272         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 273                 if (deve->mapped_lun == mapped_lun)
 274                         return deve;
 275
 276         return NULL;
 277 }
 278 EXPORT_SYMBOL(target_nacl_find_deve);
 279
 280 void target_pr_kref_release(struct kref *kref)
 281 {
 282         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 283                                                  pr_kref);
 284         complete(&deve->pr_comp);
 285 }
 286
 287 /*
 288  * Establish UA condition on SCSI device - all LUNs
 289  */
 290 void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
 291 {
 292         struct se_dev_entry *se_deve;
 293         struct se_lun *lun;
 294
 295         spin_lock(&dev->se_port_lock);
 296         list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
 297
 298                 spin_lock(&lun->lun_deve_lock);
 299                 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
 300                         core_scsi3_ua_allocate(se_deve, asc, ascq);
 301                 spin_unlock(&lun->lun_deve_lock);
 302         }
 303         spin_unlock(&dev->se_port_lock);
 304 }
 305
 306 static void
 307 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 308                              bool skip_new)
 309 {
 310         struct se_dev_entry *tmp;
 311
 312         rcu_read_lock();
 313         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 314                 if (skip_new && tmp == new)
 315                         continue;
 316                 core_scsi3_ua_allocate(tmp, 0x3F,
 317                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 318         }
 319         rcu_read_unlock();
 320 }
 321
 322 int core_enable_device_list_for_node(
 323         struct se_lun *lun,
 324         struct se_lun_acl *lun_acl,
 325         u64 mapped_lun,
 326         bool lun_access_ro,
 327         struct se_node_acl *nacl,
 328         struct se_portal_group *tpg)
 329 {
 330         struct se_dev_entry *orig, *new;
 331
 332         new = kzalloc(sizeof(*new), GFP_KERNEL);
 333         if (!new) {
 334                 pr_err("Unable to allocate se_dev_entry memory\n");
 335                 return -ENOMEM;
 336         }
 337
 338         spin_lock_init(&new->ua_lock);
 339         INIT_LIST_HEAD(&new->ua_list);
 340         INIT_LIST_HEAD(&new->lun_link);
 341
 342         new->mapped_lun = mapped_lun;
 343         kref_init(&new->pr_kref);
 344         init_completion(&new->pr_comp);
 345
 346         new->lun_access_ro = lun_access_ro;
 347         new->creation_time = get_jiffies_64();
 348         new->attach_count++;
 349
 350         mutex_lock(&nacl->lun_entry_mutex);
 351         orig = target_nacl_find_deve(nacl, mapped_lun);
 352         if (orig && orig->se_lun) {
 353                 struct se_lun *orig_lun = orig->se_lun;
 354
 355                 if (orig_lun != lun) {
 356                         pr_err("Existing orig->se_lun doesn't match new lun"
 357                                " for dynamic -> explicit NodeACL conversion:"
 358                                 " %s\n", nacl->initiatorname);
 359                         mutex_unlock(&nacl->lun_entry_mutex);
 360                         kfree(new);
 361                         return -EINVAL;
 362                 }
 363                 if (orig->se_lun_acl != NULL) {
 364                         pr_warn_ratelimited("Detected existing explicit"
 365                                 " se_lun_acl->se_lun_group reference for %s"
 366                                 " mapped_lun: %llu, failing\n",
 367                                  nacl->initiatorname, mapped_lun);
 368                         mutex_unlock(&nacl->lun_entry_mutex);
 369                         kfree(new);
 370                         return -EINVAL;
 371                 }
 372
 373                 new->se_lun = lun;
 374                 new->se_lun_acl = lun_acl;
 375                 hlist_del_rcu(&orig->link);
 376                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 377                 mutex_unlock(&nacl->lun_entry_mutex);
 378
 379                 spin_lock(&lun->lun_deve_lock);
 380                 list_del(&orig->lun_link);
 381                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 382                 spin_unlock(&lun->lun_deve_lock);
 383
 384                 kref_put(&orig->pr_kref, target_pr_kref_release);
 385                 wait_for_completion(&orig->pr_comp);
 386
 387                 target_luns_data_has_changed(nacl, new, true);
 388                 kfree_rcu(orig, rcu_head);
 389                 return 0;
 390         }
 391
 392         new->se_lun = lun;
 393         new->se_lun_acl = lun_acl;
 394         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 395         mutex_unlock(&nacl->lun_entry_mutex);
 396
 397         spin_lock(&lun->lun_deve_lock);
 398         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 399         spin_unlock(&lun->lun_deve_lock);
 400
 401         target_luns_data_has_changed(nacl, new, true);
 402         return 0;
 403 }
 404
 405 void core_disable_device_list_for_node(
 406         struct se_lun *lun,
 407         struct se_dev_entry *orig,
 408         struct se_node_acl *nacl,
 409         struct se_portal_group *tpg)
 410 {
 411         /*
 412          * rcu_dereference_raw protected by se_lun->lun_group symlink
 413          * reference to se_device->dev_group.
 414          */
 415         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 416
 417         lockdep_assert_held(&nacl->lun_entry_mutex);
 418
 419         /*
 420          * If the MappedLUN entry is being disabled, the entry in
 421          * lun->lun_deve_list must be removed now before clearing the
 422          * struct se_dev_entry pointers below as logic in
 423          * core_alua_do_transition_tg_pt() depends on these being present.
 424          *
 425          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 426          * that have not been explicitly converted to MappedLUNs ->
 427          * struct se_lun_acl, but we remove deve->lun_link from
 428          * lun->lun_deve_list. This also means that active UAs and
 429          * NodeACL context specific PR metadata for demo-mode
 430          * MappedLUN *deve will be released below..
 431          */
 432         spin_lock(&lun->lun_deve_lock);
 433         list_del(&orig->lun_link);
 434         spin_unlock(&lun->lun_deve_lock);
 435         /*
 436          * Disable struct se_dev_entry LUN ACL mapping
 437          */
 438         core_scsi3_ua_release_all(orig);
 439
 440         hlist_del_rcu(&orig->link);
 441         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 442         orig->lun_access_ro = false;
 443         orig->creation_time = 0;
 444         orig->attach_count--;
 445         /*
 446          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 447          * or REGISTER_AND_MOVE PR operation to complete.
 448          */
 449         kref_put(&orig->pr_kref, target_pr_kref_release);
 450         wait_for_completion(&orig->pr_comp);
 451
 452         kfree_rcu(orig, rcu_head);
 453
 454         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 455         target_luns_data_has_changed(nacl, NULL, false);
 456 }
 457
 458 /*      core_clear_lun_from_tpg():
 459  *
 460  *
 461  */
 462 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 463 {
 464         struct se_node_acl *nacl;
 465         struct se_dev_entry *deve;
 466
 467         mutex_lock(&tpg->acl_node_mutex);
 468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 469
 470                 mutex_lock(&nacl->lun_entry_mutex);
 471                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 472                         if (lun != deve->se_lun)
 473                                 continue;
 474
 475                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 476                 }
 477                 mutex_unlock(&nacl->lun_entry_mutex);
 478         }
 479         mutex_unlock(&tpg->acl_node_mutex);
 480 }
 481
 482 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 483 {
 484         struct se_lun *tmp;
 485
 486         spin_lock(&dev->se_port_lock);
 487         if (dev->export_count == 0x0000ffff) {
 488                 pr_warn("Reached dev->dev_port_count =="
 489                                 " 0x0000ffff\n");
 490                 spin_unlock(&dev->se_port_lock);
 491                 return -ENOSPC;
 492         }
 493 again:
 494         /*
 495          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 496          * Here is the table from spc4r17 section 7.7.3.8.
 497          *
 498          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 499          *
 500          * Code      Description
 501          * 0h        Reserved
 502          * 1h        Relative port 1, historically known as port A
 503          * 2h        Relative port 2, historically known as port B
 504          * 3h to FFFFh    Relative port 3 through 65 535
 505          */
 506         lun->lun_rtpi = dev->dev_rpti_counter++;
 507         if (!lun->lun_rtpi)
 508                 goto again;
 509
 510         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 511                 /*
 512                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 513                  * for 16-bit wrap..
 514                  */
 515                 if (lun->lun_rtpi == tmp->lun_rtpi)
 516                         goto again;
 517         }
 518         spin_unlock(&dev->se_port_lock);
 519
 520         return 0;
 521 }
 522
 523 static void se_release_vpd_for_dev(struct se_device *dev)
 524 {
 525         struct t10_vpd *vpd, *vpd_tmp;
 526
 527         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 528         list_for_each_entry_safe(vpd, vpd_tmp,
 529                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 530                 list_del(&vpd->vpd_list);
 531                 kfree(vpd);
 532         }
 533         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 534 }
 535
 536 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 537 {
 538         u32 aligned_max_sectors;
 539         u32 alignment;
 540         /*
 541          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 542          * transport_allocate_data_tasks() operation.
 543          */
 544         alignment = max(1ul, PAGE_SIZE / block_size);
 545         aligned_max_sectors = rounddown(max_sectors, alignment);
 546
 547         if (max_sectors != aligned_max_sectors)
 548                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 549                         max_sectors, aligned_max_sectors);
 550
 551         return aligned_max_sectors;
 552 }
 553
 554 int core_dev_add_lun(
 555         struct se_portal_group *tpg,
 556         struct se_device *dev,
 557         struct se_lun *lun)
 558 {
 559         int rc;
 560
 561         rc = core_tpg_add_lun(tpg, lun, false, dev);
 562         if (rc < 0)
 563                 return rc;
 564
 565         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 566                 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
 567                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 568                 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
 569         /*
 570          * Update LUN maps for dynamically added initiators when
 571          * generate_node_acl is enabled.
 572          */
 573         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 574                 struct se_node_acl *acl;
 575
 576                 mutex_lock(&tpg->acl_node_mutex);
 577                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 578                         if (acl->dynamic_node_acl &&
 579                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 580                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 581                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 582                         }
 583                 }
 584                 mutex_unlock(&tpg->acl_node_mutex);
 585         }
 586
 587         return 0;
 588 }
 589
 590 /*      core_dev_del_lun():
 591  *
 592  *
 593  */
 594 void core_dev_del_lun(
 595         struct se_portal_group *tpg,
 596         struct se_lun *lun)
 597 {
 598         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 599                 " device object\n", tpg->se_tpg_tfo->fabric_name,
 600                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 601                 tpg->se_tpg_tfo->fabric_name);
 602
 603         core_tpg_remove_lun(tpg, lun);
 604 }
 605
 606 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 607         struct se_portal_group *tpg,
 608         struct se_node_acl *nacl,
 609         u64 mapped_lun,
 610         int *ret)
 611 {
 612         struct se_lun_acl *lacl;
 613
 614         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 615                 pr_err("%s InitiatorName exceeds maximum size.\n",
 616                         tpg->se_tpg_tfo->fabric_name);
 617                 *ret = -EOVERFLOW;
 618                 return NULL;
 619         }
 620         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 621         if (!lacl) {
 622                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 623                 *ret = -ENOMEM;
 624                 return NULL;
 625         }
 626
 627         lacl->mapped_lun = mapped_lun;
 628         lacl->se_lun_nacl = nacl;
 629
 630         return lacl;
 631 }
 632
 633 int core_dev_add_initiator_node_lun_acl(
 634         struct se_portal_group *tpg,
 635         struct se_lun_acl *lacl,
 636         struct se_lun *lun,
 637         bool lun_access_ro)
 638 {
 639         struct se_node_acl *nacl = lacl->se_lun_nacl;
 640         /*
 641          * rcu_dereference_raw protected by se_lun->lun_group symlink
 642          * reference to se_device->dev_group.
 643          */
 644         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 645
 646         if (!nacl)
 647                 return -EINVAL;
 648
 649         if (lun->lun_access_ro)
 650                 lun_access_ro = true;
 651
 652         lacl->se_lun = lun;
 653
 654         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 655                         lun_access_ro, nacl, tpg) < 0)
 656                 return -EINVAL;
 657
 658         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 659                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
 660                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 661                 lun_access_ro ? "RO" : "RW",
 662                 nacl->initiatorname);
 663         /*
 664          * Check to see if there are any existing persistent reservation APTPL
 665          * pre-registrations that need to be enabled for this LUN ACL..
 666          */
 667         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 668                                             lacl->mapped_lun);
 669         return 0;
 670 }
 671
 672 int core_dev_del_initiator_node_lun_acl(
 673         struct se_lun *lun,
 674         struct se_lun_acl *lacl)
 675 {
 676         struct se_portal_group *tpg = lun->lun_tpg;
 677         struct se_node_acl *nacl;
 678         struct se_dev_entry *deve;
 679
 680         nacl = lacl->se_lun_nacl;
 681         if (!nacl)
 682                 return -EINVAL;
 683
 684         mutex_lock(&nacl->lun_entry_mutex);
 685         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 686         if (deve)
 687                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 688         mutex_unlock(&nacl->lun_entry_mutex);
 689
 690         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 691                 " InitiatorNode: %s Mapped LUN: %llu\n",
 692                 tpg->se_tpg_tfo->fabric_name,
 693                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 694                 nacl->initiatorname, lacl->mapped_lun);
 695
 696         return 0;
 697 }
 698
 699 void core_dev_free_initiator_node_lun_acl(
 700         struct se_portal_group *tpg,
 701         struct se_lun_acl *lacl)
 702 {
 703         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 704                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
 705                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 706                 tpg->se_tpg_tfo->fabric_name,
 707                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 708
 709         kfree(lacl);
 710 }
 711
 712 static void scsi_dump_inquiry(struct se_device *dev)
 713 {
 714         struct t10_wwn *wwn = &dev->t10_wwn;
 715         int device_type = dev->transport->get_device_type(dev);
 716
 717         /*
 718          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 719          */
 720         pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
 721                 wwn->vendor);
 722         pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
 723                 wwn->model);
 724         pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
 725                 wwn->revision);
 726         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 727 }
 728
 729 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 730 {
 731         struct se_device *dev;
 732         struct se_lun *xcopy_lun;
 733         int i;
 734
 735         dev = hba->backend->ops->alloc_device(hba, name);
 736         if (!dev)
 737                 return NULL;
 738
 739         dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
 740         if (!dev->queues) {
 741                 dev->transport->free_device(dev);
 742                 return NULL;
 743         }
 744
 745         dev->queue_cnt = nr_cpu_ids;
 746         for (i = 0; i < dev->queue_cnt; i++) {
 747                 struct se_device_queue *q;
 748
 749                 q = &dev->queues[i];
 750                 INIT_LIST_HEAD(&q->state_list);
 751                 spin_lock_init(&q->lock);
 752
 753                 init_llist_head(&q->sq.cmd_list);
 754                 INIT_WORK(&q->sq.work, target_queued_submit_work);
 755         }
 756
 757         dev->se_hba = hba;
 758         dev->transport = hba->backend->ops;
 759         dev->transport_flags = dev->transport->transport_flags_default;
 760         dev->prot_length = sizeof(struct t10_pi_tuple);
 761         dev->hba_index = hba->hba_index;
 762
 763         INIT_LIST_HEAD(&dev->dev_sep_list);
 764         INIT_LIST_HEAD(&dev->dev_tmr_list);
 765         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 766         INIT_LIST_HEAD(&dev->qf_cmd_list);
 767         spin_lock_init(&dev->delayed_cmd_lock);
 768         spin_lock_init(&dev->dev_reservation_lock);
 769         spin_lock_init(&dev->se_port_lock);
 770         spin_lock_init(&dev->se_tmr_lock);
 771         spin_lock_init(&dev->qf_cmd_lock);
 772         sema_init(&dev->caw_sem, 1);
 773         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 774         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 775         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 776         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 777         spin_lock_init(&dev->t10_pr.registration_lock);
 778         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 779         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 780         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 781         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 782         spin_lock_init(&dev->t10_alua.lba_map_lock);
 783
 784         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 785         mutex_init(&dev->lun_reset_mutex);
 786
 787         dev->t10_wwn.t10_dev = dev;
 788         /*
 789          * Use OpenFabrics IEEE Company ID: 00 14 05
 790          */
 791         dev->t10_wwn.company_id = 0x001405;
 792
 793         dev->t10_alua.t10_dev = dev;
 794
 795         dev->dev_attrib.da_dev = dev;
 796         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 797         dev->dev_attrib.emulate_dpo = 1;
 798         dev->dev_attrib.emulate_fua_write = 1;
 799         dev->dev_attrib.emulate_fua_read = 1;
 800         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 801         dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
 802         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 803         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 804         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 805         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 806         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 807         dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
 808         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 809         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 810         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 811         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 812         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 813         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 814         dev->dev_attrib.max_unmap_block_desc_count =
 815                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 816         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 817         dev->dev_attrib.unmap_granularity_alignment =
 818                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 819         dev->dev_attrib.unmap_zeroes_data =
 820                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 821         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 822
 823         xcopy_lun = &dev->xcopy_lun;
 824         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 825         init_completion(&xcopy_lun->lun_shutdown_comp);
 826         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 827         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 828         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 829         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 830
 831         /* Preload the default INQUIRY const values */
 832         strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
 833         strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 834                 sizeof(dev->t10_wwn.model));
 835         strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 836                 sizeof(dev->t10_wwn.revision));
 837
 838         return dev;
 839 }
 840
 841 /*
 842  * Check if the underlying struct block_device supports discard and if yes
 843  * configure the UNMAP parameters.
 844  */
 845 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 846                                        struct block_device *bdev)
 847 {
 848         int block_size = bdev_logical_block_size(bdev);
 849
 850         if (!bdev_max_discard_sectors(bdev))
 851                 return false;
 852
 853         attrib->max_unmap_lba_count =
 854                 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
 855         /*
 856          * Currently hardcoded to 1 in Linux/SCSI code..
 857          */
 858         attrib->max_unmap_block_desc_count = 1;
 859         attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
 860         attrib->unmap_granularity_alignment =
 861                 bdev_discard_alignment(bdev) / block_size;
 862         return true;
 863 }
 864 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 865
 866 /*
 867  * Convert from blocksize advertised to the initiator to the 512 byte
 868  * units unconditionally used by the Linux block layer.
 869  */
 870 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 871 {
 872         switch (dev->dev_attrib.block_size) {
 873         case 4096:
 874                 return lb << 3;
 875         case 2048:
 876                 return lb << 2;
 877         case 1024:
 878                 return lb << 1;
 879         default:
 880                 return lb;
 881         }
 882 }
 883 EXPORT_SYMBOL(target_to_linux_sector);
 884
 885 struct devices_idr_iter {
 886         int (*fn)(struct se_device *dev, void *data);
 887         void *data;
 888 };
 889
 890 static int target_devices_idr_iter(int id, void *p, void *data)
 891          __must_hold(&device_mutex)
 892 {
 893         struct devices_idr_iter *iter = data;
 894         struct se_device *dev = p;
 895         struct config_item *item;
 896         int ret;
 897
 898         /*
 899          * We add the device early to the idr, so it can be used
 900          * by backend modules during configuration. We do not want
 901          * to allow other callers to access partially setup devices,
 902          * so we skip them here.
 903          */
 904         if (!target_dev_configured(dev))
 905                 return 0;
 906
 907         item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 908         if (!item)
 909                 return 0;
 910         mutex_unlock(&device_mutex);
 911
 912         ret = iter->fn(dev, iter->data);
 913         config_item_put(item);
 914
 915         mutex_lock(&device_mutex);
 916         return ret;
 917 }
 918
 919 /**
 920  * target_for_each_device - iterate over configured devices
 921  * @fn: iterator function
 922  * @data: pointer to data that will be passed to fn
 923  *
 924  * fn must return 0 to continue looping over devices. non-zero will break
 925  * from the loop and return that value to the caller.
 926  */
 927 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 928                            void *data)
 929 {
 930         struct devices_idr_iter iter = { .fn = fn, .data = data };
 931         int ret;
 932
 933         mutex_lock(&device_mutex);
 934         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 935         mutex_unlock(&device_mutex);
 936         return ret;
 937 }
 938
 939 int target_configure_device(struct se_device *dev)
 940 {
 941         struct se_hba *hba = dev->se_hba;
 942         int ret, id;
 943
 944         if (target_dev_configured(dev)) {
 945                 pr_err("se_dev->se_dev_ptr already set for storage"
 946                                 " object\n");
 947                 return -EEXIST;
 948         }
 949
 950         /*
 951          * Add early so modules like tcmu can use during its
 952          * configuration.
 953          */
 954         mutex_lock(&device_mutex);
 955         /*
 956          * Use cyclic to try and avoid collisions with devices
 957          * that were recently removed.
 958          */
 959         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 960         mutex_unlock(&device_mutex);
 961         if (id < 0) {
 962                 ret = -ENOMEM;
 963                 goto out;
 964         }
 965         dev->dev_index = id;
 966
 967         ret = dev->transport->configure_device(dev);
 968         if (ret)
 969                 goto out_free_index;
 970
 971         if (dev->transport->configure_unmap &&
 972             dev->transport->configure_unmap(dev)) {
 973                 pr_debug("Discard support available, but disabled by default.\n");
 974         }
 975
 976         /*
 977          * XXX: there is not much point to have two different values here..
 978          */
 979         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 980         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 981
 982         /*
 983          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 984          */
 985         dev->dev_attrib.hw_max_sectors =
 986                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 987                                          dev->dev_attrib.hw_block_size);
 988         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 989
 990         dev->creation_time = get_jiffies_64();
 991
 992         ret = core_setup_alua(dev);
 993         if (ret)
 994                 goto out_destroy_device;
 995
 996         /*
 997          * Setup work_queue for QUEUE_FULL
 998          */
 999         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1000
1001         scsi_dump_inquiry(dev);
1002
1003         spin_lock(&hba->device_lock);
1004         hba->dev_count++;
1005         spin_unlock(&hba->device_lock);
1006
1007         dev->dev_flags |= DF_CONFIGURED;
1008
1009         return 0;
1010
1011 out_destroy_device:
1012         dev->transport->destroy_device(dev);
1013 out_free_index:
1014         mutex_lock(&device_mutex);
1015         idr_remove(&devices_idr, dev->dev_index);
1016         mutex_unlock(&device_mutex);
1017 out:
1018         se_release_vpd_for_dev(dev);
1019         return ret;
1020 }
1021
1022 void target_free_device(struct se_device *dev)
1023 {
1024         struct se_hba *hba = dev->se_hba;
1025
1026         WARN_ON(!list_empty(&dev->dev_sep_list));
1027
1028         if (target_dev_configured(dev)) {
1029                 dev->transport->destroy_device(dev);
1030
1031                 mutex_lock(&device_mutex);
1032                 idr_remove(&devices_idr, dev->dev_index);
1033                 mutex_unlock(&device_mutex);
1034
1035                 spin_lock(&hba->device_lock);
1036                 hba->dev_count--;
1037                 spin_unlock(&hba->device_lock);
1038         }
1039
1040         core_alua_free_lu_gp_mem(dev);
1041         core_alua_set_lba_map(dev, NULL, 0, 0);
1042         core_scsi3_free_all_registrations(dev);
1043         se_release_vpd_for_dev(dev);
1044
1045         if (dev->transport->free_prot)
1046                 dev->transport->free_prot(dev);
1047
1048         kfree(dev->queues);
1049         dev->transport->free_device(dev);
1050 }
1051
1052 int core_dev_setup_virtual_lun0(void)
1053 {
1054         struct se_hba *hba;
1055         struct se_device *dev;
1056         char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1057         int ret;
1058
1059         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1060         if (IS_ERR(hba))
1061                 return PTR_ERR(hba);
1062
1063         dev = target_alloc_device(hba, "virt_lun0");
1064         if (!dev) {
1065                 ret = -ENOMEM;
1066                 goto out_free_hba;
1067         }
1068
1069         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1070
1071         ret = target_configure_device(dev);
1072         if (ret)
1073                 goto out_free_se_dev;
1074
1075         lun0_hba = hba;
1076         g_lun0_dev = dev;
1077         return 0;
1078
1079 out_free_se_dev:
1080         target_free_device(dev);
1081 out_free_hba:
1082         core_delete_hba(hba);
1083         return ret;
1084 }
1085
1086
1087 void core_dev_release_virtual_lun0(void)
1088 {
1089         struct se_hba *hba = lun0_hba;
1090
1091         if (!hba)
1092                 return;
1093
1094         if (g_lun0_dev)
1095                 target_free_device(g_lun0_dev);
1096         core_delete_hba(hba);
1097 }
1098
1099 /*
1100  * Common CDB parsing for kernel and user passthrough.
1101  */
1102 sense_reason_t
1103 passthrough_parse_cdb(struct se_cmd *cmd,
1104         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1105 {
1106         unsigned char *cdb = cmd->t_task_cdb;
1107         struct se_device *dev = cmd->se_dev;
1108         unsigned int size;
1109
1110         /*
1111          * For REPORT LUNS we always need to emulate the response, for everything
1112          * else, pass it up.
1113          */
1114         if (cdb[0] == REPORT_LUNS) {
1115                 cmd->execute_cmd = spc_emulate_report_luns;
1116                 return TCM_NO_SENSE;
1117         }
1118
1119         /*
1120          * With emulate_pr disabled, all reservation requests should fail,
1121          * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1122          */
1123         if (!dev->dev_attrib.emulate_pr &&
1124             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1125              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1126              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1127              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1128                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1129         }
1130
1131         /*
1132          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1133          * emulate the response, since tcmu does not have the information
1134          * required to process these commands.
1135          */
1136         if (!(dev->transport_flags &
1137               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1138                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1139                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1140                         size = get_unaligned_be16(&cdb[7]);
1141                         return target_cmd_size_check(cmd, size);
1142                 }
1143                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1144                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1145                         size = get_unaligned_be32(&cdb[5]);
1146                         return target_cmd_size_check(cmd, size);
1147                 }
1148
1149                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1150                         cmd->execute_cmd = target_scsi2_reservation_release;
1151                         if (cdb[0] == RELEASE_10)
1152                                 size = get_unaligned_be16(&cdb[7]);
1153                         else
1154                                 size = cmd->data_length;
1155                         return target_cmd_size_check(cmd, size);
1156                 }
1157                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1158                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1159                         if (cdb[0] == RESERVE_10)
1160                                 size = get_unaligned_be16(&cdb[7]);
1161                         else
1162                                 size = cmd->data_length;
1163                         return target_cmd_size_check(cmd, size);
1164                 }
1165         }
1166
1167         /* Set DATA_CDB flag for ops that should have it */
1168         switch (cdb[0]) {
1169         case READ_6:
1170         case READ_10:
1171         case READ_12:
1172         case READ_16:
1173         case WRITE_6:
1174         case WRITE_10:
1175         case WRITE_12:
1176         case WRITE_16:
1177         case WRITE_VERIFY:
1178         case WRITE_VERIFY_12:
1179         case WRITE_VERIFY_16:
1180         case COMPARE_AND_WRITE:
1181         case XDWRITEREAD_10:
1182                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1183                 break;
1184         case VARIABLE_LENGTH_CMD:
1185                 switch (get_unaligned_be16(&cdb[8])) {
1186                 case READ_32:
1187                 case WRITE_32:
1188                 case WRITE_VERIFY_32:
1189                 case XDWRITEREAD_32:
1190                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1191                         break;
1192                 }
1193         }
1194
1195         cmd->execute_cmd = exec_cmd;
1196
1197         return TCM_NO_SENSE;
1198 }
1199 EXPORT_SYMBOL(passthrough_parse_cdb);