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