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, u64 unpacked_lun)
  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, unpacked_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                 se_lun = rcu_dereference(deve->se_lun);
  69
  70                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  71                         se_lun = NULL;
  72                         goto out_unlock;
  73                 }
  74
  75                 se_cmd->se_lun = se_lun;
  76                 se_cmd->pr_res_key = deve->pr_res_key;
  77                 se_cmd->orig_fe_lun = unpacked_lun;
  78                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  79                 se_cmd->lun_ref_active = true;
  80
  81                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  82                     deve->lun_access_ro) {
  83                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  84                                 " Access for 0x%08llx\n",
  85                                 se_cmd->se_tfo->fabric_name,
  86                                 unpacked_lun);
  87                         rcu_read_unlock();
  88                         ret = TCM_WRITE_PROTECTED;
  89                         goto ref_dev;
  90                 }
  91         }
  92 out_unlock:
  93         rcu_read_unlock();
  94
  95         if (!se_lun) {
  96                 /*
  97                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  98                  * REPORT_LUNS, et al to be returned when no active
  99                  * MappedLUN=0 exists for this Initiator Port.
 100                  */
 101                 if (unpacked_lun != 0) {
 102                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 103                                 " Access for 0x%08llx\n",
 104                                 se_cmd->se_tfo->fabric_name,
 105                                 unpacked_lun);
 106                         return TCM_NON_EXISTENT_LUN;
 107                 }
 108
 109                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 110                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 111                 se_cmd->orig_fe_lun = 0;
 112                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 113
 114                 percpu_ref_get(&se_lun->lun_ref);
 115                 se_cmd->lun_ref_active = true;
 116
 117                 /*
 118                  * Force WRITE PROTECT for virtual LUN 0
 119                  */
 120                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 121                     (se_cmd->data_direction != DMA_NONE)) {
 122                         ret = TCM_WRITE_PROTECTED;
 123                         goto ref_dev;
 124                 }
 125         }
 126         /*
 127          * RCU reference protected by percpu se_lun->lun_ref taken above that
 128          * must drop to zero (including initial reference) before this se_lun
 129          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 130          * target_core_fabric_configfs.c:target_fabric_port_release
 131          */
 132 ref_dev:
 133         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 134         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 135
 136         if (se_cmd->data_direction == DMA_TO_DEVICE)
 137                 atomic_long_add(se_cmd->data_length,
 138                                 &se_cmd->se_dev->write_bytes);
 139         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 140                 atomic_long_add(se_cmd->data_length,
 141                                 &se_cmd->se_dev->read_bytes);
 142
 143         return ret;
 144 }
 145 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 146
 147 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 148 {
 149         struct se_dev_entry *deve;
 150         struct se_lun *se_lun = NULL;
 151         struct se_session *se_sess = se_cmd->se_sess;
 152         struct se_node_acl *nacl = se_sess->se_node_acl;
 153         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 154         unsigned long flags;
 155
 156         rcu_read_lock();
 157         deve = target_nacl_find_deve(nacl, unpacked_lun);
 158         if (deve) {
 159                 se_lun = rcu_dereference(deve->se_lun);
 160
 161                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 162                         se_lun = NULL;
 163                         goto out_unlock;
 164                 }
 165
 166                 se_cmd->se_lun = se_lun;
 167                 se_cmd->pr_res_key = deve->pr_res_key;
 168                 se_cmd->orig_fe_lun = unpacked_lun;
 169                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 170                 se_cmd->lun_ref_active = true;
 171         }
 172 out_unlock:
 173         rcu_read_unlock();
 174
 175         if (!se_lun) {
 176                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 177                         " Access for 0x%08llx\n",
 178                         se_cmd->se_tfo->fabric_name,
 179                         unpacked_lun);
 180                 return -ENODEV;
 181         }
 182         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 183         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 184
 185         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 186         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 187         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 188
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 192
 193 bool target_lun_is_rdonly(struct se_cmd *cmd)
 194 {
 195         struct se_session *se_sess = cmd->se_sess;
 196         struct se_dev_entry *deve;
 197         bool ret;
 198
 199         rcu_read_lock();
 200         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 201         ret = deve && deve->lun_access_ro;
 202         rcu_read_unlock();
 203
 204         return ret;
 205 }
 206 EXPORT_SYMBOL(target_lun_is_rdonly);
 207
 208 /*
 209  * This function is called from core_scsi3_emulate_pro_register_and_move()
 210  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 211  * when a matching rtpi is found.
 212  */
 213 struct se_dev_entry *core_get_se_deve_from_rtpi(
 214         struct se_node_acl *nacl,
 215         u16 rtpi)
 216 {
 217         struct se_dev_entry *deve;
 218         struct se_lun *lun;
 219         struct se_portal_group *tpg = nacl->se_tpg;
 220
 221         rcu_read_lock();
 222         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 223                 lun = rcu_dereference(deve->se_lun);
 224                 if (!lun) {
 225                         pr_err("%s device entries device pointer is"
 226                                 " NULL, but Initiator has access.\n",
 227                                 tpg->se_tpg_tfo->fabric_name);
 228                         continue;
 229                 }
 230                 if (lun->lun_rtpi != rtpi)
 231                         continue;
 232
 233                 kref_get(&deve->pr_kref);
 234                 rcu_read_unlock();
 235
 236                 return deve;
 237         }
 238         rcu_read_unlock();
 239
 240         return NULL;
 241 }
 242
 243 void core_free_device_list_for_node(
 244         struct se_node_acl *nacl,
 245         struct se_portal_group *tpg)
 246 {
 247         struct se_dev_entry *deve;
 248
 249         mutex_lock(&nacl->lun_entry_mutex);
 250         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 251                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 252                                         lockdep_is_held(&nacl->lun_entry_mutex));
 253                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 254         }
 255         mutex_unlock(&nacl->lun_entry_mutex);
 256 }
 257
 258 void core_update_device_list_access(
 259         u64 mapped_lun,
 260         bool lun_access_ro,
 261         struct se_node_acl *nacl)
 262 {
 263         struct se_dev_entry *deve;
 264
 265         mutex_lock(&nacl->lun_entry_mutex);
 266         deve = target_nacl_find_deve(nacl, mapped_lun);
 267         if (deve)
 268                 deve->lun_access_ro = lun_access_ro;
 269         mutex_unlock(&nacl->lun_entry_mutex);
 270 }
 271
 272 /*
 273  * Called with rcu_read_lock or nacl->device_list_lock held.
 274  */
 275 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 276 {
 277         struct se_dev_entry *deve;
 278
 279         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 280                 if (deve->mapped_lun == mapped_lun)
 281                         return deve;
 282
 283         return NULL;
 284 }
 285 EXPORT_SYMBOL(target_nacl_find_deve);
 286
 287 void target_pr_kref_release(struct kref *kref)
 288 {
 289         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 290                                                  pr_kref);
 291         complete(&deve->pr_comp);
 292 }
 293
 294 static void
 295 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 296                              bool skip_new)
 297 {
 298         struct se_dev_entry *tmp;
 299
 300         rcu_read_lock();
 301         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 302                 if (skip_new && tmp == new)
 303                         continue;
 304                 core_scsi3_ua_allocate(tmp, 0x3F,
 305                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 306         }
 307         rcu_read_unlock();
 308 }
 309
 310 int core_enable_device_list_for_node(
 311         struct se_lun *lun,
 312         struct se_lun_acl *lun_acl,
 313         u64 mapped_lun,
 314         bool lun_access_ro,
 315         struct se_node_acl *nacl,
 316         struct se_portal_group *tpg)
 317 {
 318         struct se_dev_entry *orig, *new;
 319
 320         new = kzalloc(sizeof(*new), GFP_KERNEL);
 321         if (!new) {
 322                 pr_err("Unable to allocate se_dev_entry memory\n");
 323                 return -ENOMEM;
 324         }
 325
 326         spin_lock_init(&new->ua_lock);
 327         INIT_LIST_HEAD(&new->ua_list);
 328         INIT_LIST_HEAD(&new->lun_link);
 329
 330         new->mapped_lun = mapped_lun;
 331         kref_init(&new->pr_kref);
 332         init_completion(&new->pr_comp);
 333
 334         new->lun_access_ro = lun_access_ro;
 335         new->creation_time = get_jiffies_64();
 336         new->attach_count++;
 337
 338         mutex_lock(&nacl->lun_entry_mutex);
 339         orig = target_nacl_find_deve(nacl, mapped_lun);
 340         if (orig && orig->se_lun) {
 341                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 342                                         lockdep_is_held(&nacl->lun_entry_mutex));
 343
 344                 if (orig_lun != lun) {
 345                         pr_err("Existing orig->se_lun doesn't match new lun"
 346                                " for dynamic -> explicit NodeACL conversion:"
 347                                 " %s\n", nacl->initiatorname);
 348                         mutex_unlock(&nacl->lun_entry_mutex);
 349                         kfree(new);
 350                         return -EINVAL;
 351                 }
 352                 if (orig->se_lun_acl != NULL) {
 353                         pr_warn_ratelimited("Detected existing explicit"
 354                                 " se_lun_acl->se_lun_group reference for %s"
 355                                 " mapped_lun: %llu, failing\n",
 356                                  nacl->initiatorname, mapped_lun);
 357                         mutex_unlock(&nacl->lun_entry_mutex);
 358                         kfree(new);
 359                         return -EINVAL;
 360                 }
 361
 362                 rcu_assign_pointer(new->se_lun, lun);
 363                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 364                 hlist_del_rcu(&orig->link);
 365                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 366                 mutex_unlock(&nacl->lun_entry_mutex);
 367
 368                 spin_lock(&lun->lun_deve_lock);
 369                 list_del(&orig->lun_link);
 370                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 371                 spin_unlock(&lun->lun_deve_lock);
 372
 373                 kref_put(&orig->pr_kref, target_pr_kref_release);
 374                 wait_for_completion(&orig->pr_comp);
 375
 376                 target_luns_data_has_changed(nacl, new, true);
 377                 kfree_rcu(orig, rcu_head);
 378                 return 0;
 379         }
 380
 381         rcu_assign_pointer(new->se_lun, lun);
 382         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 383         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 384         mutex_unlock(&nacl->lun_entry_mutex);
 385
 386         spin_lock(&lun->lun_deve_lock);
 387         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 388         spin_unlock(&lun->lun_deve_lock);
 389
 390         target_luns_data_has_changed(nacl, new, true);
 391         return 0;
 392 }
 393
 394 void core_disable_device_list_for_node(
 395         struct se_lun *lun,
 396         struct se_dev_entry *orig,
 397         struct se_node_acl *nacl,
 398         struct se_portal_group *tpg)
 399 {
 400         /*
 401          * rcu_dereference_raw protected by se_lun->lun_group symlink
 402          * reference to se_device->dev_group.
 403          */
 404         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 405
 406         lockdep_assert_held(&nacl->lun_entry_mutex);
 407
 408         /*
 409          * If the MappedLUN entry is being disabled, the entry in
 410          * lun->lun_deve_list must be removed now before clearing the
 411          * struct se_dev_entry pointers below as logic in
 412          * core_alua_do_transition_tg_pt() depends on these being present.
 413          *
 414          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 415          * that have not been explicitly converted to MappedLUNs ->
 416          * struct se_lun_acl, but we remove deve->lun_link from
 417          * lun->lun_deve_list. This also means that active UAs and
 418          * NodeACL context specific PR metadata for demo-mode
 419          * MappedLUN *deve will be released below..
 420          */
 421         spin_lock(&lun->lun_deve_lock);
 422         list_del(&orig->lun_link);
 423         spin_unlock(&lun->lun_deve_lock);
 424         /*
 425          * Disable struct se_dev_entry LUN ACL mapping
 426          */
 427         core_scsi3_ua_release_all(orig);
 428
 429         hlist_del_rcu(&orig->link);
 430         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 431         orig->lun_access_ro = false;
 432         orig->creation_time = 0;
 433         orig->attach_count--;
 434         /*
 435          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 436          * or REGISTER_AND_MOVE PR operation to complete.
 437          */
 438         kref_put(&orig->pr_kref, target_pr_kref_release);
 439         wait_for_completion(&orig->pr_comp);
 440
 441         rcu_assign_pointer(orig->se_lun, NULL);
 442         rcu_assign_pointer(orig->se_lun_acl, NULL);
 443
 444         kfree_rcu(orig, rcu_head);
 445
 446         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 447         target_luns_data_has_changed(nacl, NULL, false);
 448 }
 449
 450 /*      core_clear_lun_from_tpg():
 451  *
 452  *
 453  */
 454 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 455 {
 456         struct se_node_acl *nacl;
 457         struct se_dev_entry *deve;
 458
 459         mutex_lock(&tpg->acl_node_mutex);
 460         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 461
 462                 mutex_lock(&nacl->lun_entry_mutex);
 463                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 464                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 465                                         lockdep_is_held(&nacl->lun_entry_mutex));
 466
 467                         if (lun != tmp_lun)
 468                                 continue;
 469
 470                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 471                 }
 472                 mutex_unlock(&nacl->lun_entry_mutex);
 473         }
 474         mutex_unlock(&tpg->acl_node_mutex);
 475 }
 476
 477 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 478 {
 479         struct se_lun *tmp;
 480
 481         spin_lock(&dev->se_port_lock);
 482         if (dev->export_count == 0x0000ffff) {
 483                 pr_warn("Reached dev->dev_port_count =="
 484                                 " 0x0000ffff\n");
 485                 spin_unlock(&dev->se_port_lock);
 486                 return -ENOSPC;
 487         }
 488 again:
 489         /*
 490          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 491          * Here is the table from spc4r17 section 7.7.3.8.
 492          *
 493          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 494          *
 495          * Code      Description
 496          * 0h        Reserved
 497          * 1h        Relative port 1, historically known as port A
 498          * 2h        Relative port 2, historically known as port B
 499          * 3h to FFFFh    Relative port 3 through 65 535
 500          */
 501         lun->lun_rtpi = dev->dev_rpti_counter++;
 502         if (!lun->lun_rtpi)
 503                 goto again;
 504
 505         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 506                 /*
 507                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 508                  * for 16-bit wrap..
 509                  */
 510                 if (lun->lun_rtpi == tmp->lun_rtpi)
 511                         goto again;
 512         }
 513         spin_unlock(&dev->se_port_lock);
 514
 515         return 0;
 516 }
 517
 518 static void se_release_vpd_for_dev(struct se_device *dev)
 519 {
 520         struct t10_vpd *vpd, *vpd_tmp;
 521
 522         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 523         list_for_each_entry_safe(vpd, vpd_tmp,
 524                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 525                 list_del(&vpd->vpd_list);
 526                 kfree(vpd);
 527         }
 528         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 529 }
 530
 531 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 532 {
 533         u32 aligned_max_sectors;
 534         u32 alignment;
 535         /*
 536          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 537          * transport_allocate_data_tasks() operation.
 538          */
 539         alignment = max(1ul, PAGE_SIZE / block_size);
 540         aligned_max_sectors = rounddown(max_sectors, alignment);
 541
 542         if (max_sectors != aligned_max_sectors)
 543                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 544                         max_sectors, aligned_max_sectors);
 545
 546         return aligned_max_sectors;
 547 }
 548
 549 int core_dev_add_lun(
 550         struct se_portal_group *tpg,
 551         struct se_device *dev,
 552         struct se_lun *lun)
 553 {
 554         int rc;
 555
 556         rc = core_tpg_add_lun(tpg, lun, false, dev);
 557         if (rc < 0)
 558                 return rc;
 559
 560         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 561                 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
 562                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 563                 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
 564         /*
 565          * Update LUN maps for dynamically added initiators when
 566          * generate_node_acl is enabled.
 567          */
 568         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 569                 struct se_node_acl *acl;
 570
 571                 mutex_lock(&tpg->acl_node_mutex);
 572                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 573                         if (acl->dynamic_node_acl &&
 574                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 575                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 576                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 577                         }
 578                 }
 579                 mutex_unlock(&tpg->acl_node_mutex);
 580         }
 581
 582         return 0;
 583 }
 584
 585 /*      core_dev_del_lun():
 586  *
 587  *
 588  */
 589 void core_dev_del_lun(
 590         struct se_portal_group *tpg,
 591         struct se_lun *lun)
 592 {
 593         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 594                 " device object\n", tpg->se_tpg_tfo->fabric_name,
 595                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 596                 tpg->se_tpg_tfo->fabric_name);
 597
 598         core_tpg_remove_lun(tpg, lun);
 599 }
 600
 601 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 602         struct se_portal_group *tpg,
 603         struct se_node_acl *nacl,
 604         u64 mapped_lun,
 605         int *ret)
 606 {
 607         struct se_lun_acl *lacl;
 608
 609         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 610                 pr_err("%s InitiatorName exceeds maximum size.\n",
 611                         tpg->se_tpg_tfo->fabric_name);
 612                 *ret = -EOVERFLOW;
 613                 return NULL;
 614         }
 615         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 616         if (!lacl) {
 617                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 618                 *ret = -ENOMEM;
 619                 return NULL;
 620         }
 621
 622         lacl->mapped_lun = mapped_lun;
 623         lacl->se_lun_nacl = nacl;
 624
 625         return lacl;
 626 }
 627
 628 int core_dev_add_initiator_node_lun_acl(
 629         struct se_portal_group *tpg,
 630         struct se_lun_acl *lacl,
 631         struct se_lun *lun,
 632         bool lun_access_ro)
 633 {
 634         struct se_node_acl *nacl = lacl->se_lun_nacl;
 635         /*
 636          * rcu_dereference_raw protected by se_lun->lun_group symlink
 637          * reference to se_device->dev_group.
 638          */
 639         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 640
 641         if (!nacl)
 642                 return -EINVAL;
 643
 644         if (lun->lun_access_ro)
 645                 lun_access_ro = true;
 646
 647         lacl->se_lun = lun;
 648
 649         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 650                         lun_access_ro, nacl, tpg) < 0)
 651                 return -EINVAL;
 652
 653         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 654                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
 655                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 656                 lun_access_ro ? "RO" : "RW",
 657                 nacl->initiatorname);
 658         /*
 659          * Check to see if there are any existing persistent reservation APTPL
 660          * pre-registrations that need to be enabled for this LUN ACL..
 661          */
 662         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 663                                             lacl->mapped_lun);
 664         return 0;
 665 }
 666
 667 int core_dev_del_initiator_node_lun_acl(
 668         struct se_lun *lun,
 669         struct se_lun_acl *lacl)
 670 {
 671         struct se_portal_group *tpg = lun->lun_tpg;
 672         struct se_node_acl *nacl;
 673         struct se_dev_entry *deve;
 674
 675         nacl = lacl->se_lun_nacl;
 676         if (!nacl)
 677                 return -EINVAL;
 678
 679         mutex_lock(&nacl->lun_entry_mutex);
 680         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 681         if (deve)
 682                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 683         mutex_unlock(&nacl->lun_entry_mutex);
 684
 685         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 686                 " InitiatorNode: %s Mapped LUN: %llu\n",
 687                 tpg->se_tpg_tfo->fabric_name,
 688                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 689                 nacl->initiatorname, lacl->mapped_lun);
 690
 691         return 0;
 692 }
 693
 694 void core_dev_free_initiator_node_lun_acl(
 695         struct se_portal_group *tpg,
 696         struct se_lun_acl *lacl)
 697 {
 698         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 699                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
 700                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 701                 tpg->se_tpg_tfo->fabric_name,
 702                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 703
 704         kfree(lacl);
 705 }
 706
 707 static void scsi_dump_inquiry(struct se_device *dev)
 708 {
 709         struct t10_wwn *wwn = &dev->t10_wwn;
 710         int device_type = dev->transport->get_device_type(dev);
 711
 712         /*
 713          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 714          */
 715         pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
 716                 wwn->vendor);
 717         pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
 718                 wwn->model);
 719         pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
 720                 wwn->revision);
 721         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 722 }
 723
 724 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 725 {
 726         struct se_device *dev;
 727         struct se_lun *xcopy_lun;
 728
 729         dev = hba->backend->ops->alloc_device(hba, name);
 730         if (!dev)
 731                 return NULL;
 732
 733         dev->se_hba = hba;
 734         dev->transport = hba->backend->ops;
 735         dev->prot_length = sizeof(struct t10_pi_tuple);
 736         dev->hba_index = hba->hba_index;
 737
 738         INIT_LIST_HEAD(&dev->dev_sep_list);
 739         INIT_LIST_HEAD(&dev->dev_tmr_list);
 740         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 741         INIT_LIST_HEAD(&dev->state_list);
 742         INIT_LIST_HEAD(&dev->qf_cmd_list);
 743         spin_lock_init(&dev->execute_task_lock);
 744         spin_lock_init(&dev->delayed_cmd_lock);
 745         spin_lock_init(&dev->dev_reservation_lock);
 746         spin_lock_init(&dev->se_port_lock);
 747         spin_lock_init(&dev->se_tmr_lock);
 748         spin_lock_init(&dev->qf_cmd_lock);
 749         sema_init(&dev->caw_sem, 1);
 750         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 751         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 752         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 753         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 754         spin_lock_init(&dev->t10_pr.registration_lock);
 755         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 756         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 757         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 758         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 759         spin_lock_init(&dev->t10_alua.lba_map_lock);
 760
 761         dev->t10_wwn.t10_dev = dev;
 762         dev->t10_alua.t10_dev = dev;
 763
 764         dev->dev_attrib.da_dev = dev;
 765         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 766         dev->dev_attrib.emulate_dpo = 1;
 767         dev->dev_attrib.emulate_fua_write = 1;
 768         dev->dev_attrib.emulate_fua_read = 1;
 769         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 770         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 771         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 772         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 773         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 774         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 775         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 776         dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
 777         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 778         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 779         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 780         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 781         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 782         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 783         dev->dev_attrib.max_unmap_block_desc_count =
 784                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 785         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 786         dev->dev_attrib.unmap_granularity_alignment =
 787                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 788         dev->dev_attrib.unmap_zeroes_data =
 789                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 790         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 791
 792         xcopy_lun = &dev->xcopy_lun;
 793         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 794         init_completion(&xcopy_lun->lun_shutdown_comp);
 795         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 796         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 797         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 798         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 799
 800         /* Preload the default INQUIRY const values */
 801         strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
 802         strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 803                 sizeof(dev->t10_wwn.model));
 804         strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 805                 sizeof(dev->t10_wwn.revision));
 806
 807         return dev;
 808 }
 809
 810 /*
 811  * Check if the underlying struct block_device request_queue supports
 812  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 813  * in ATA and we need to set TPE=1
 814  */
 815 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 816                                        struct request_queue *q)
 817 {
 818         int block_size = queue_logical_block_size(q);
 819
 820         if (!blk_queue_discard(q))
 821                 return false;
 822
 823         attrib->max_unmap_lba_count =
 824                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 825         /*
 826          * Currently hardcoded to 1 in Linux/SCSI code..
 827          */
 828         attrib->max_unmap_block_desc_count = 1;
 829         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 830         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 831                                                                 block_size;
 832         attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
 833         return true;
 834 }
 835 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 836
 837 /*
 838  * Convert from blocksize advertised to the initiator to the 512 byte
 839  * units unconditionally used by the Linux block layer.
 840  */
 841 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 842 {
 843         switch (dev->dev_attrib.block_size) {
 844         case 4096:
 845                 return lb << 3;
 846         case 2048:
 847                 return lb << 2;
 848         case 1024:
 849                 return lb << 1;
 850         default:
 851                 return lb;
 852         }
 853 }
 854 EXPORT_SYMBOL(target_to_linux_sector);
 855
 856 struct devices_idr_iter {
 857         struct config_item *prev_item;
 858         int (*fn)(struct se_device *dev, void *data);
 859         void *data;
 860 };
 861
 862 static int target_devices_idr_iter(int id, void *p, void *data)
 863          __must_hold(&device_mutex)
 864 {
 865         struct devices_idr_iter *iter = data;
 866         struct se_device *dev = p;
 867         int ret;
 868
 869         config_item_put(iter->prev_item);
 870         iter->prev_item = NULL;
 871
 872         /*
 873          * We add the device early to the idr, so it can be used
 874          * by backend modules during configuration. We do not want
 875          * to allow other callers to access partially setup devices,
 876          * so we skip them here.
 877          */
 878         if (!target_dev_configured(dev))
 879                 return 0;
 880
 881         iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 882         if (!iter->prev_item)
 883                 return 0;
 884         mutex_unlock(&device_mutex);
 885
 886         ret = iter->fn(dev, iter->data);
 887
 888         mutex_lock(&device_mutex);
 889         return ret;
 890 }
 891
 892 /**
 893  * target_for_each_device - iterate over configured devices
 894  * @fn: iterator function
 895  * @data: pointer to data that will be passed to fn
 896  *
 897  * fn must return 0 to continue looping over devices. non-zero will break
 898  * from the loop and return that value to the caller.
 899  */
 900 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 901                            void *data)
 902 {
 903         struct devices_idr_iter iter = { .fn = fn, .data = data };
 904         int ret;
 905
 906         mutex_lock(&device_mutex);
 907         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 908         mutex_unlock(&device_mutex);
 909         config_item_put(iter.prev_item);
 910         return ret;
 911 }
 912
 913 int target_configure_device(struct se_device *dev)
 914 {
 915         struct se_hba *hba = dev->se_hba;
 916         int ret, id;
 917
 918         if (target_dev_configured(dev)) {
 919                 pr_err("se_dev->se_dev_ptr already set for storage"
 920                                 " object\n");
 921                 return -EEXIST;
 922         }
 923
 924         /*
 925          * Add early so modules like tcmu can use during its
 926          * configuration.
 927          */
 928         mutex_lock(&device_mutex);
 929         /*
 930          * Use cyclic to try and avoid collisions with devices
 931          * that were recently removed.
 932          */
 933         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 934         mutex_unlock(&device_mutex);
 935         if (id < 0) {
 936                 ret = -ENOMEM;
 937                 goto out;
 938         }
 939         dev->dev_index = id;
 940
 941         ret = dev->transport->configure_device(dev);
 942         if (ret)
 943                 goto out_free_index;
 944         /*
 945          * XXX: there is not much point to have two different values here..
 946          */
 947         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 948         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 949
 950         /*
 951          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 952          */
 953         dev->dev_attrib.hw_max_sectors =
 954                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 955                                          dev->dev_attrib.hw_block_size);
 956         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 957
 958         dev->creation_time = get_jiffies_64();
 959
 960         ret = core_setup_alua(dev);
 961         if (ret)
 962                 goto out_destroy_device;
 963
 964         /*
 965          * Setup work_queue for QUEUE_FULL
 966          */
 967         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 968
 969         scsi_dump_inquiry(dev);
 970
 971         spin_lock(&hba->device_lock);
 972         hba->dev_count++;
 973         spin_unlock(&hba->device_lock);
 974
 975         dev->dev_flags |= DF_CONFIGURED;
 976
 977         return 0;
 978
 979 out_destroy_device:
 980         dev->transport->destroy_device(dev);
 981 out_free_index:
 982         mutex_lock(&device_mutex);
 983         idr_remove(&devices_idr, dev->dev_index);
 984         mutex_unlock(&device_mutex);
 985 out:
 986         se_release_vpd_for_dev(dev);
 987         return ret;
 988 }
 989
 990 void target_free_device(struct se_device *dev)
 991 {
 992         struct se_hba *hba = dev->se_hba;
 993
 994         WARN_ON(!list_empty(&dev->dev_sep_list));
 995
 996         if (target_dev_configured(dev)) {
 997                 dev->transport->destroy_device(dev);
 998
 999                 mutex_lock(&device_mutex);
1000                 idr_remove(&devices_idr, dev->dev_index);
1001                 mutex_unlock(&device_mutex);
1002
1003                 spin_lock(&hba->device_lock);
1004                 hba->dev_count--;
1005                 spin_unlock(&hba->device_lock);
1006         }
1007
1008         core_alua_free_lu_gp_mem(dev);
1009         core_alua_set_lba_map(dev, NULL, 0, 0);
1010         core_scsi3_free_all_registrations(dev);
1011         se_release_vpd_for_dev(dev);
1012
1013         if (dev->transport->free_prot)
1014                 dev->transport->free_prot(dev);
1015
1016         dev->transport->free_device(dev);
1017 }
1018
1019 int core_dev_setup_virtual_lun0(void)
1020 {
1021         struct se_hba *hba;
1022         struct se_device *dev;
1023         char buf[] = "rd_pages=8,rd_nullio=1";
1024         int ret;
1025
1026         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1027         if (IS_ERR(hba))
1028                 return PTR_ERR(hba);
1029
1030         dev = target_alloc_device(hba, "virt_lun0");
1031         if (!dev) {
1032                 ret = -ENOMEM;
1033                 goto out_free_hba;
1034         }
1035
1036         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1037
1038         ret = target_configure_device(dev);
1039         if (ret)
1040                 goto out_free_se_dev;
1041
1042         lun0_hba = hba;
1043         g_lun0_dev = dev;
1044         return 0;
1045
1046 out_free_se_dev:
1047         target_free_device(dev);
1048 out_free_hba:
1049         core_delete_hba(hba);
1050         return ret;
1051 }
1052
1053
1054 void core_dev_release_virtual_lun0(void)
1055 {
1056         struct se_hba *hba = lun0_hba;
1057
1058         if (!hba)
1059                 return;
1060
1061         if (g_lun0_dev)
1062                 target_free_device(g_lun0_dev);
1063         core_delete_hba(hba);
1064 }
1065
1066 /*
1067  * Common CDB parsing for kernel and user passthrough.
1068  */
1069 sense_reason_t
1070 passthrough_parse_cdb(struct se_cmd *cmd,
1071         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1072 {
1073         unsigned char *cdb = cmd->t_task_cdb;
1074         struct se_device *dev = cmd->se_dev;
1075         unsigned int size;
1076
1077         /*
1078          * Clear a lun set in the cdb if the initiator talking to use spoke
1079          * and old standards version, as we can't assume the underlying device
1080          * won't choke up on it.
1081          */
1082         switch (cdb[0]) {
1083         case READ_10: /* SBC - RDProtect */
1084         case READ_12: /* SBC - RDProtect */
1085         case READ_16: /* SBC - RDProtect */
1086         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1087         case VERIFY: /* SBC - VRProtect */
1088         case VERIFY_16: /* SBC - VRProtect */
1089         case WRITE_VERIFY: /* SBC - VRProtect */
1090         case WRITE_VERIFY_12: /* SBC - VRProtect */
1091         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1092                 break;
1093         default:
1094                 cdb[1] &= 0x1f; /* clear logical unit number */
1095                 break;
1096         }
1097
1098         /*
1099          * For REPORT LUNS we always need to emulate the response, for everything
1100          * else, pass it up.
1101          */
1102         if (cdb[0] == REPORT_LUNS) {
1103                 cmd->execute_cmd = spc_emulate_report_luns;
1104                 return TCM_NO_SENSE;
1105         }
1106
1107         /*
1108          * With emulate_pr disabled, all reservation requests should fail,
1109          * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1110          */
1111         if (!dev->dev_attrib.emulate_pr &&
1112             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1113              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1114              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1115              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1116                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1117         }
1118
1119         /*
1120          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1121          * emulate the response, since tcmu does not have the information
1122          * required to process these commands.
1123          */
1124         if (!(dev->transport->transport_flags &
1125               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1126                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1127                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1128                         size = get_unaligned_be16(&cdb[7]);
1129                         return target_cmd_size_check(cmd, size);
1130                 }
1131                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1132                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1133                         size = get_unaligned_be32(&cdb[5]);
1134                         return target_cmd_size_check(cmd, size);
1135                 }
1136
1137                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1138                         cmd->execute_cmd = target_scsi2_reservation_release;
1139                         if (cdb[0] == RELEASE_10)
1140                                 size = get_unaligned_be16(&cdb[7]);
1141                         else
1142                                 size = cmd->data_length;
1143                         return target_cmd_size_check(cmd, size);
1144                 }
1145                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1146                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1147                         if (cdb[0] == RESERVE_10)
1148                                 size = get_unaligned_be16(&cdb[7]);
1149                         else
1150                                 size = cmd->data_length;
1151                         return target_cmd_size_check(cmd, size);
1152                 }
1153         }
1154
1155         /* Set DATA_CDB flag for ops that should have it */
1156         switch (cdb[0]) {
1157         case READ_6:
1158         case READ_10:
1159         case READ_12:
1160         case READ_16:
1161         case WRITE_6:
1162         case WRITE_10:
1163         case WRITE_12:
1164         case WRITE_16:
1165         case WRITE_VERIFY:
1166         case WRITE_VERIFY_12:
1167         case WRITE_VERIFY_16:
1168         case COMPARE_AND_WRITE:
1169         case XDWRITEREAD_10:
1170                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1171                 break;
1172         case VARIABLE_LENGTH_CMD:
1173                 switch (get_unaligned_be16(&cdb[8])) {
1174                 case READ_32:
1175                 case WRITE_32:
1176                 case WRITE_VERIFY_32:
1177                 case XDWRITEREAD_32:
1178                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1179                         break;
1180                 }
1181         }
1182
1183         cmd->execute_cmd = exec_cmd;
1184
1185         return TCM_NO_SENSE;
1186 }
1187 EXPORT_SYMBOL(passthrough_parse_cdb);