drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * (c) Copyright 2003-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/net.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kthread.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <linux/t10-pi.h>
  37 #include <asm/unaligned.h>
  38 #include <net/sock.h>
  39 #include <net/tcp.h>
  40 #include <scsi/scsi_common.h>
  41 #include <scsi/scsi_proto.h>
  42
  43 #include <target/target_core_base.h>
  44 #include <target/target_core_backend.h>
  45 #include <target/target_core_fabric.h>
  46
  47 #include "target_core_internal.h"
  48 #include "target_core_alua.h"
  49 #include "target_core_pr.h"
  50 #include "target_core_ua.h"
  51
  52 static DEFINE_MUTEX(device_mutex);
  53 static LIST_HEAD(device_list);
  54 static DEFINE_IDR(devices_idr);
  55
  56 static struct se_hba *lun0_hba;
  57 /* not static, needed by tpg.c */
  58 struct se_device *g_lun0_dev;
  59
  60 sense_reason_t
  61 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
  62 {
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = se_cmd->se_sess;
  65         struct se_node_acl *nacl = se_sess->se_node_acl;
  66         struct se_dev_entry *deve;
  67         sense_reason_t ret = TCM_NO_SENSE;
  68
  69         rcu_read_lock();
  70         deve = target_nacl_find_deve(nacl, unpacked_lun);
  71         if (deve) {
  72                 atomic_long_inc(&deve->total_cmds);
  73
  74                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  75                         atomic_long_add(se_cmd->data_length,
  76                                         &deve->write_bytes);
  77                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  78                         atomic_long_add(se_cmd->data_length,
  79                                         &deve->read_bytes);
  80
  81                 se_lun = rcu_dereference(deve->se_lun);
  82
  83                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  84                         se_lun = NULL;
  85                         goto out_unlock;
  86                 }
  87
  88                 se_cmd->se_lun = se_lun;
  89                 se_cmd->pr_res_key = deve->pr_res_key;
  90                 se_cmd->orig_fe_lun = unpacked_lun;
  91                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  92                 se_cmd->lun_ref_active = true;
  93
  94                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  95                     deve->lun_access_ro) {
  96                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  97                                 " Access for 0x%08llx\n",
  98                                 se_cmd->se_tfo->get_fabric_name(),
  99                                 unpacked_lun);
 100                         rcu_read_unlock();
 101                         ret = TCM_WRITE_PROTECTED;
 102                         goto ref_dev;
 103                 }
 104         }
 105 out_unlock:
 106         rcu_read_unlock();
 107
 108         if (!se_lun) {
 109                 /*
 110                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 111                  * REPORT_LUNS, et al to be returned when no active
 112                  * MappedLUN=0 exists for this Initiator Port.
 113                  */
 114                 if (unpacked_lun != 0) {
 115                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 116                                 " Access for 0x%08llx\n",
 117                                 se_cmd->se_tfo->get_fabric_name(),
 118                                 unpacked_lun);
 119                         return TCM_NON_EXISTENT_LUN;
 120                 }
 121
 122                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 123                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 124                 se_cmd->orig_fe_lun = 0;
 125                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 126
 127                 percpu_ref_get(&se_lun->lun_ref);
 128                 se_cmd->lun_ref_active = true;
 129
 130                 /*
 131                  * Force WRITE PROTECT for virtual LUN 0
 132                  */
 133                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 134                     (se_cmd->data_direction != DMA_NONE)) {
 135                         ret = TCM_WRITE_PROTECTED;
 136                         goto ref_dev;
 137                 }
 138         }
 139         /*
 140          * RCU reference protected by percpu se_lun->lun_ref taken above that
 141          * must drop to zero (including initial reference) before this se_lun
 142          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 143          * target_core_fabric_configfs.c:target_fabric_port_release
 144          */
 145 ref_dev:
 146         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 147         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 148
 149         if (se_cmd->data_direction == DMA_TO_DEVICE)
 150                 atomic_long_add(se_cmd->data_length,
 151                                 &se_cmd->se_dev->write_bytes);
 152         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 153                 atomic_long_add(se_cmd->data_length,
 154                                 &se_cmd->se_dev->read_bytes);
 155
 156         return ret;
 157 }
 158 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 159
 160 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 161 {
 162         struct se_dev_entry *deve;
 163         struct se_lun *se_lun = NULL;
 164         struct se_session *se_sess = se_cmd->se_sess;
 165         struct se_node_acl *nacl = se_sess->se_node_acl;
 166         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 167
 168         rcu_read_lock();
 169         deve = target_nacl_find_deve(nacl, unpacked_lun);
 170         if (deve) {
 171                 se_lun = rcu_dereference(deve->se_lun);
 172
 173                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 174                         se_lun = NULL;
 175                         goto out_unlock;
 176                 }
 177
 178                 se_cmd->se_lun = se_lun;
 179                 se_cmd->pr_res_key = deve->pr_res_key;
 180                 se_cmd->orig_fe_lun = unpacked_lun;
 181                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 182                 se_cmd->lun_ref_active = true;
 183         }
 184 out_unlock:
 185         rcu_read_unlock();
 186
 187         if (!se_lun) {
 188                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 189                         " Access for 0x%08llx\n",
 190                         se_cmd->se_tfo->get_fabric_name(),
 191                         unpacked_lun);
 192                 return -ENODEV;
 193         }
 194         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 195         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 196
 197         return 0;
 198 }
 199 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 200
 201 bool target_lun_is_rdonly(struct se_cmd *cmd)
 202 {
 203         struct se_session *se_sess = cmd->se_sess;
 204         struct se_dev_entry *deve;
 205         bool ret;
 206
 207         rcu_read_lock();
 208         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 209         ret = deve && deve->lun_access_ro;
 210         rcu_read_unlock();
 211
 212         return ret;
 213 }
 214 EXPORT_SYMBOL(target_lun_is_rdonly);
 215
 216 /*
 217  * This function is called from core_scsi3_emulate_pro_register_and_move()
 218  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 219  * when a matching rtpi is found.
 220  */
 221 struct se_dev_entry *core_get_se_deve_from_rtpi(
 222         struct se_node_acl *nacl,
 223         u16 rtpi)
 224 {
 225         struct se_dev_entry *deve;
 226         struct se_lun *lun;
 227         struct se_portal_group *tpg = nacl->se_tpg;
 228
 229         rcu_read_lock();
 230         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 231                 lun = rcu_dereference(deve->se_lun);
 232                 if (!lun) {
 233                         pr_err("%s device entries device pointer is"
 234                                 " NULL, but Initiator has access.\n",
 235                                 tpg->se_tpg_tfo->get_fabric_name());
 236                         continue;
 237                 }
 238                 if (lun->lun_rtpi != rtpi)
 239                         continue;
 240
 241                 kref_get(&deve->pr_kref);
 242                 rcu_read_unlock();
 243
 244                 return deve;
 245         }
 246         rcu_read_unlock();
 247
 248         return NULL;
 249 }
 250
 251 void core_free_device_list_for_node(
 252         struct se_node_acl *nacl,
 253         struct se_portal_group *tpg)
 254 {
 255         struct se_dev_entry *deve;
 256
 257         mutex_lock(&nacl->lun_entry_mutex);
 258         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 259                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 260                                         lockdep_is_held(&nacl->lun_entry_mutex));
 261                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 262         }
 263         mutex_unlock(&nacl->lun_entry_mutex);
 264 }
 265
 266 void core_update_device_list_access(
 267         u64 mapped_lun,
 268         bool lun_access_ro,
 269         struct se_node_acl *nacl)
 270 {
 271         struct se_dev_entry *deve;
 272
 273         mutex_lock(&nacl->lun_entry_mutex);
 274         deve = target_nacl_find_deve(nacl, mapped_lun);
 275         if (deve)
 276                 deve->lun_access_ro = lun_access_ro;
 277         mutex_unlock(&nacl->lun_entry_mutex);
 278 }
 279
 280 /*
 281  * Called with rcu_read_lock or nacl->device_list_lock held.
 282  */
 283 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 284 {
 285         struct se_dev_entry *deve;
 286
 287         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 288                 if (deve->mapped_lun == mapped_lun)
 289                         return deve;
 290
 291         return NULL;
 292 }
 293 EXPORT_SYMBOL(target_nacl_find_deve);
 294
 295 void target_pr_kref_release(struct kref *kref)
 296 {
 297         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 298                                                  pr_kref);
 299         complete(&deve->pr_comp);
 300 }
 301
 302 static void
 303 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 304                              bool skip_new)
 305 {
 306         struct se_dev_entry *tmp;
 307
 308         rcu_read_lock();
 309         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 310                 if (skip_new && tmp == new)
 311                         continue;
 312                 core_scsi3_ua_allocate(tmp, 0x3F,
 313                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 314         }
 315         rcu_read_unlock();
 316 }
 317
 318 int core_enable_device_list_for_node(
 319         struct se_lun *lun,
 320         struct se_lun_acl *lun_acl,
 321         u64 mapped_lun,
 322         bool lun_access_ro,
 323         struct se_node_acl *nacl,
 324         struct se_portal_group *tpg)
 325 {
 326         struct se_dev_entry *orig, *new;
 327
 328         new = kzalloc(sizeof(*new), GFP_KERNEL);
 329         if (!new) {
 330                 pr_err("Unable to allocate se_dev_entry memory\n");
 331                 return -ENOMEM;
 332         }
 333
 334         spin_lock_init(&new->ua_lock);
 335         INIT_LIST_HEAD(&new->ua_list);
 336         INIT_LIST_HEAD(&new->lun_link);
 337
 338         new->mapped_lun = mapped_lun;
 339         kref_init(&new->pr_kref);
 340         init_completion(&new->pr_comp);
 341
 342         new->lun_access_ro = lun_access_ro;
 343         new->creation_time = get_jiffies_64();
 344         new->attach_count++;
 345
 346         mutex_lock(&nacl->lun_entry_mutex);
 347         orig = target_nacl_find_deve(nacl, mapped_lun);
 348         if (orig && orig->se_lun) {
 349                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 350                                         lockdep_is_held(&nacl->lun_entry_mutex));
 351
 352                 if (orig_lun != lun) {
 353                         pr_err("Existing orig->se_lun doesn't match new lun"
 354                                " for dynamic -> explicit NodeACL conversion:"
 355                                 " %s\n", nacl->initiatorname);
 356                         mutex_unlock(&nacl->lun_entry_mutex);
 357                         kfree(new);
 358                         return -EINVAL;
 359                 }
 360                 if (orig->se_lun_acl != NULL) {
 361                         pr_warn_ratelimited("Detected existing explicit"
 362                                 " se_lun_acl->se_lun_group reference for %s"
 363                                 " mapped_lun: %llu, failing\n",
 364                                  nacl->initiatorname, mapped_lun);
 365                         mutex_unlock(&nacl->lun_entry_mutex);
 366                         kfree(new);
 367                         return -EINVAL;
 368                 }
 369
 370                 rcu_assign_pointer(new->se_lun, lun);
 371                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 372                 hlist_del_rcu(&orig->link);
 373                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 374                 mutex_unlock(&nacl->lun_entry_mutex);
 375
 376                 spin_lock(&lun->lun_deve_lock);
 377                 list_del(&orig->lun_link);
 378                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 379                 spin_unlock(&lun->lun_deve_lock);
 380
 381                 kref_put(&orig->pr_kref, target_pr_kref_release);
 382                 wait_for_completion(&orig->pr_comp);
 383
 384                 target_luns_data_has_changed(nacl, new, true);
 385                 kfree_rcu(orig, rcu_head);
 386                 return 0;
 387         }
 388
 389         rcu_assign_pointer(new->se_lun, lun);
 390         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 391         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 392         mutex_unlock(&nacl->lun_entry_mutex);
 393
 394         spin_lock(&lun->lun_deve_lock);
 395         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 396         spin_unlock(&lun->lun_deve_lock);
 397
 398         target_luns_data_has_changed(nacl, new, true);
 399         return 0;
 400 }
 401
 402 /*
 403  *      Called with se_node_acl->lun_entry_mutex held.
 404  */
 405 void core_disable_device_list_for_node(
 406         struct se_lun *lun,
 407         struct se_dev_entry *orig,
 408         struct se_node_acl *nacl,
 409         struct se_portal_group *tpg)
 410 {
 411         /*
 412          * rcu_dereference_raw protected by se_lun->lun_group symlink
 413          * reference to se_device->dev_group.
 414          */
 415         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 416         /*
 417          * If the MappedLUN entry is being disabled, the entry in
 418          * lun->lun_deve_list must be removed now before clearing the
 419          * struct se_dev_entry pointers below as logic in
 420          * core_alua_do_transition_tg_pt() depends on these being present.
 421          *
 422          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 423          * that have not been explicitly converted to MappedLUNs ->
 424          * struct se_lun_acl, but we remove deve->lun_link from
 425          * lun->lun_deve_list. This also means that active UAs and
 426          * NodeACL context specific PR metadata for demo-mode
 427          * MappedLUN *deve will be released below..
 428          */
 429         spin_lock(&lun->lun_deve_lock);
 430         list_del(&orig->lun_link);
 431         spin_unlock(&lun->lun_deve_lock);
 432         /*
 433          * Disable struct se_dev_entry LUN ACL mapping
 434          */
 435         core_scsi3_ua_release_all(orig);
 436
 437         hlist_del_rcu(&orig->link);
 438         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 439         orig->lun_access_ro = false;
 440         orig->creation_time = 0;
 441         orig->attach_count--;
 442         /*
 443          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 444          * or REGISTER_AND_MOVE PR operation to complete.
 445          */
 446         kref_put(&orig->pr_kref, target_pr_kref_release);
 447         wait_for_completion(&orig->pr_comp);
 448
 449         rcu_assign_pointer(orig->se_lun, NULL);
 450         rcu_assign_pointer(orig->se_lun_acl, NULL);
 451
 452         kfree_rcu(orig, rcu_head);
 453
 454         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 455         target_luns_data_has_changed(nacl, NULL, false);
 456 }
 457
 458 /*      core_clear_lun_from_tpg():
 459  *
 460  *
 461  */
 462 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 463 {
 464         struct se_node_acl *nacl;
 465         struct se_dev_entry *deve;
 466
 467         mutex_lock(&tpg->acl_node_mutex);
 468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 469
 470                 mutex_lock(&nacl->lun_entry_mutex);
 471                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 472                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 473                                         lockdep_is_held(&nacl->lun_entry_mutex));
 474
 475                         if (lun != tmp_lun)
 476                                 continue;
 477
 478                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 479                 }
 480                 mutex_unlock(&nacl->lun_entry_mutex);
 481         }
 482         mutex_unlock(&tpg->acl_node_mutex);
 483 }
 484
 485 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 486 {
 487         struct se_lun *tmp;
 488
 489         spin_lock(&dev->se_port_lock);
 490         if (dev->export_count == 0x0000ffff) {
 491                 pr_warn("Reached dev->dev_port_count =="
 492                                 " 0x0000ffff\n");
 493                 spin_unlock(&dev->se_port_lock);
 494                 return -ENOSPC;
 495         }
 496 again:
 497         /*
 498          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 499          * Here is the table from spc4r17 section 7.7.3.8.
 500          *
 501          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 502          *
 503          * Code      Description
 504          * 0h        Reserved
 505          * 1h        Relative port 1, historically known as port A
 506          * 2h        Relative port 2, historically known as port B
 507          * 3h to FFFFh    Relative port 3 through 65 535
 508          */
 509         lun->lun_rtpi = dev->dev_rpti_counter++;
 510         if (!lun->lun_rtpi)
 511                 goto again;
 512
 513         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 514                 /*
 515                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 516                  * for 16-bit wrap..
 517                  */
 518                 if (lun->lun_rtpi == tmp->lun_rtpi)
 519                         goto again;
 520         }
 521         spin_unlock(&dev->se_port_lock);
 522
 523         return 0;
 524 }
 525
 526 static void se_release_vpd_for_dev(struct se_device *dev)
 527 {
 528         struct t10_vpd *vpd, *vpd_tmp;
 529
 530         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 531         list_for_each_entry_safe(vpd, vpd_tmp,
 532                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 533                 list_del(&vpd->vpd_list);
 534                 kfree(vpd);
 535         }
 536         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 537 }
 538
 539 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 540 {
 541         u32 aligned_max_sectors;
 542         u32 alignment;
 543         /*
 544          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 545          * transport_allocate_data_tasks() operation.
 546          */
 547         alignment = max(1ul, PAGE_SIZE / block_size);
 548         aligned_max_sectors = rounddown(max_sectors, alignment);
 549
 550         if (max_sectors != aligned_max_sectors)
 551                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 552                         max_sectors, aligned_max_sectors);
 553
 554         return aligned_max_sectors;
 555 }
 556
 557 int core_dev_add_lun(
 558         struct se_portal_group *tpg,
 559         struct se_device *dev,
 560         struct se_lun *lun)
 561 {
 562         int rc;
 563
 564         rc = core_tpg_add_lun(tpg, lun, false, dev);
 565         if (rc < 0)
 566                 return rc;
 567
 568         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 569                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 570                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 571                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 572         /*
 573          * Update LUN maps for dynamically added initiators when
 574          * generate_node_acl is enabled.
 575          */
 576         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 577                 struct se_node_acl *acl;
 578
 579                 mutex_lock(&tpg->acl_node_mutex);
 580                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 581                         if (acl->dynamic_node_acl &&
 582                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 583                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 584                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 585                         }
 586                 }
 587                 mutex_unlock(&tpg->acl_node_mutex);
 588         }
 589
 590         return 0;
 591 }
 592
 593 /*      core_dev_del_lun():
 594  *
 595  *
 596  */
 597 void core_dev_del_lun(
 598         struct se_portal_group *tpg,
 599         struct se_lun *lun)
 600 {
 601         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 602                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 603                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 604                 tpg->se_tpg_tfo->get_fabric_name());
 605
 606         core_tpg_remove_lun(tpg, lun);
 607 }
 608
 609 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 610         struct se_portal_group *tpg,
 611         struct se_node_acl *nacl,
 612         u64 mapped_lun,
 613         int *ret)
 614 {
 615         struct se_lun_acl *lacl;
 616
 617         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 618                 pr_err("%s InitiatorName exceeds maximum size.\n",
 619                         tpg->se_tpg_tfo->get_fabric_name());
 620                 *ret = -EOVERFLOW;
 621                 return NULL;
 622         }
 623         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 624         if (!lacl) {
 625                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 626                 *ret = -ENOMEM;
 627                 return NULL;
 628         }
 629
 630         lacl->mapped_lun = mapped_lun;
 631         lacl->se_lun_nacl = nacl;
 632
 633         return lacl;
 634 }
 635
 636 int core_dev_add_initiator_node_lun_acl(
 637         struct se_portal_group *tpg,
 638         struct se_lun_acl *lacl,
 639         struct se_lun *lun,
 640         bool lun_access_ro)
 641 {
 642         struct se_node_acl *nacl = lacl->se_lun_nacl;
 643         /*
 644          * rcu_dereference_raw protected by se_lun->lun_group symlink
 645          * reference to se_device->dev_group.
 646          */
 647         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 648
 649         if (!nacl)
 650                 return -EINVAL;
 651
 652         if (lun->lun_access_ro)
 653                 lun_access_ro = true;
 654
 655         lacl->se_lun = lun;
 656
 657         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 658                         lun_access_ro, nacl, tpg) < 0)
 659                 return -EINVAL;
 660
 661         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 662                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 663                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 664                 lun_access_ro ? "RO" : "RW",
 665                 nacl->initiatorname);
 666         /*
 667          * Check to see if there are any existing persistent reservation APTPL
 668          * pre-registrations that need to be enabled for this LUN ACL..
 669          */
 670         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 671                                             lacl->mapped_lun);
 672         return 0;
 673 }
 674
 675 int core_dev_del_initiator_node_lun_acl(
 676         struct se_lun *lun,
 677         struct se_lun_acl *lacl)
 678 {
 679         struct se_portal_group *tpg = lun->lun_tpg;
 680         struct se_node_acl *nacl;
 681         struct se_dev_entry *deve;
 682
 683         nacl = lacl->se_lun_nacl;
 684         if (!nacl)
 685                 return -EINVAL;
 686
 687         mutex_lock(&nacl->lun_entry_mutex);
 688         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 689         if (deve)
 690                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 691         mutex_unlock(&nacl->lun_entry_mutex);
 692
 693         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 694                 " InitiatorNode: %s Mapped LUN: %llu\n",
 695                 tpg->se_tpg_tfo->get_fabric_name(),
 696                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 697                 nacl->initiatorname, lacl->mapped_lun);
 698
 699         return 0;
 700 }
 701
 702 void core_dev_free_initiator_node_lun_acl(
 703         struct se_portal_group *tpg,
 704         struct se_lun_acl *lacl)
 705 {
 706         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 707                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 708                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 709                 tpg->se_tpg_tfo->get_fabric_name(),
 710                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 711
 712         kfree(lacl);
 713 }
 714
 715 static void scsi_dump_inquiry(struct se_device *dev)
 716 {
 717         struct t10_wwn *wwn = &dev->t10_wwn;
 718         char buf[17];
 719         int i, device_type;
 720         /*
 721          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 722          */
 723         for (i = 0; i < 8; i++)
 724                 if (wwn->vendor[i] >= 0x20)
 725                         buf[i] = wwn->vendor[i];
 726                 else
 727                         buf[i] = ' ';
 728         buf[i] = '\0';
 729         pr_debug("  Vendor: %s\n", buf);
 730
 731         for (i = 0; i < 16; i++)
 732                 if (wwn->model[i] >= 0x20)
 733                         buf[i] = wwn->model[i];
 734                 else
 735                         buf[i] = ' ';
 736         buf[i] = '\0';
 737         pr_debug("  Model: %s\n", buf);
 738
 739         for (i = 0; i < 4; i++)
 740                 if (wwn->revision[i] >= 0x20)
 741                         buf[i] = wwn->revision[i];
 742                 else
 743                         buf[i] = ' ';
 744         buf[i] = '\0';
 745         pr_debug("  Revision: %s\n", buf);
 746
 747         device_type = dev->transport->get_device_type(dev);
 748         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 749 }
 750
 751 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 752 {
 753         struct se_device *dev;
 754         struct se_lun *xcopy_lun;
 755
 756         dev = hba->backend->ops->alloc_device(hba, name);
 757         if (!dev)
 758                 return NULL;
 759
 760         dev->se_hba = hba;
 761         dev->transport = hba->backend->ops;
 762         dev->prot_length = sizeof(struct t10_pi_tuple);
 763         dev->hba_index = hba->hba_index;
 764
 765         INIT_LIST_HEAD(&dev->dev_sep_list);
 766         INIT_LIST_HEAD(&dev->dev_tmr_list);
 767         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 768         INIT_LIST_HEAD(&dev->state_list);
 769         INIT_LIST_HEAD(&dev->qf_cmd_list);
 770         spin_lock_init(&dev->execute_task_lock);
 771         spin_lock_init(&dev->delayed_cmd_lock);
 772         spin_lock_init(&dev->dev_reservation_lock);
 773         spin_lock_init(&dev->se_port_lock);
 774         spin_lock_init(&dev->se_tmr_lock);
 775         spin_lock_init(&dev->qf_cmd_lock);
 776         sema_init(&dev->caw_sem, 1);
 777         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 778         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 779         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 780         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 781         spin_lock_init(&dev->t10_pr.registration_lock);
 782         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 783         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 784         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 785         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 786         spin_lock_init(&dev->t10_alua.lba_map_lock);
 787
 788         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 789
 790         dev->t10_wwn.t10_dev = dev;
 791         dev->t10_alua.t10_dev = dev;
 792
 793         dev->dev_attrib.da_dev = dev;
 794         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 795         dev->dev_attrib.emulate_dpo = 1;
 796         dev->dev_attrib.emulate_fua_write = 1;
 797         dev->dev_attrib.emulate_fua_read = 1;
 798         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 799         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 800         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 801         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 802         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 803         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 804         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 805         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 806         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 807         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 808         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 809         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 810         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 811         dev->dev_attrib.max_unmap_block_desc_count =
 812                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 813         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 814         dev->dev_attrib.unmap_granularity_alignment =
 815                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 816         dev->dev_attrib.unmap_zeroes_data =
 817                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 818         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 819
 820         xcopy_lun = &dev->xcopy_lun;
 821         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 822         init_completion(&xcopy_lun->lun_ref_comp);
 823         init_completion(&xcopy_lun->lun_shutdown_comp);
 824         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 825         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 826         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 827         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 828
 829         return dev;
 830 }
 831
 832 /*
 833  * Check if the underlying struct block_device request_queue supports
 834  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 835  * in ATA and we need to set TPE=1
 836  */
 837 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 838                                        struct request_queue *q)
 839 {
 840         int block_size = queue_logical_block_size(q);
 841
 842         if (!blk_queue_discard(q))
 843                 return false;
 844
 845         attrib->max_unmap_lba_count =
 846                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 847         /*
 848          * Currently hardcoded to 1 in Linux/SCSI code..
 849          */
 850         attrib->max_unmap_block_desc_count = 1;
 851         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 852         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 853                                                                 block_size;
 854         attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
 855         return true;
 856 }
 857 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 858
 859 /*
 860  * Convert from blocksize advertised to the initiator to the 512 byte
 861  * units unconditionally used by the Linux block layer.
 862  */
 863 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 864 {
 865         switch (dev->dev_attrib.block_size) {
 866         case 4096:
 867                 return lb << 3;
 868         case 2048:
 869                 return lb << 2;
 870         case 1024:
 871                 return lb << 1;
 872         default:
 873                 return lb;
 874         }
 875 }
 876 EXPORT_SYMBOL(target_to_linux_sector);
 877
 878 struct devices_idr_iter {
 879         int (*fn)(struct se_device *dev, void *data);
 880         void *data;
 881 };
 882
 883 static int target_devices_idr_iter(int id, void *p, void *data)
 884          __must_hold(&device_mutex)
 885 {
 886         struct devices_idr_iter *iter = data;
 887         struct se_device *dev = p;
 888         struct config_item *item;
 889         int ret;
 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         item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 901         if (!item)
 902                 return 0;
 903         mutex_unlock(&device_mutex);
 904
 905         ret = iter->fn(dev, iter->data);
 906         config_item_put(item);
 907
 908         mutex_lock(&device_mutex);
 909         return ret;
 910 }
 911
 912 /**
 913  * target_for_each_device - iterate over configured devices
 914  * @fn: iterator function
 915  * @data: pointer to data that will be passed to fn
 916  *
 917  * fn must return 0 to continue looping over devices. non-zero will break
 918  * from the loop and return that value to the caller.
 919  */
 920 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 921                            void *data)
 922 {
 923         struct devices_idr_iter iter = { .fn = fn, .data = data };
 924         int ret;
 925
 926         mutex_lock(&device_mutex);
 927         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 928         mutex_unlock(&device_mutex);
 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          * Startup the struct se_device processing thread
 985          */
 986         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
 987                                       dev->transport->name);
 988         if (!dev->tmr_wq) {
 989                 pr_err("Unable to create tmr workqueue for %s\n",
 990                         dev->transport->name);
 991                 ret = -ENOMEM;
 992                 goto out_free_alua;
 993         }
 994
 995         /*
 996          * Setup work_queue for QUEUE_FULL
 997          */
 998         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 999
1000         /*
1001          * Preload the initial INQUIRY const values if we are doing
1002          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1003          * passthrough because this is being provided by the backend LLD.
1004          */
1005         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1006                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1007                 strncpy(&dev->t10_wwn.model[0],
1008                         dev->transport->inquiry_prod, 16);
1009                 strncpy(&dev->t10_wwn.revision[0],
1010                         dev->transport->inquiry_rev, 4);
1011         }
1012
1013         scsi_dump_inquiry(dev);
1014
1015         spin_lock(&hba->device_lock);
1016         hba->dev_count++;
1017         spin_unlock(&hba->device_lock);
1018
1019         dev->dev_flags |= DF_CONFIGURED;
1020
1021         return 0;
1022
1023 out_free_alua:
1024         core_alua_free_lu_gp_mem(dev);
1025 out_destroy_device:
1026         dev->transport->destroy_device(dev);
1027 out_free_index:
1028         mutex_lock(&device_mutex);
1029         idr_remove(&devices_idr, dev->dev_index);
1030         mutex_unlock(&device_mutex);
1031 out:
1032         se_release_vpd_for_dev(dev);
1033         return ret;
1034 }
1035
1036 void target_free_device(struct se_device *dev)
1037 {
1038         struct se_hba *hba = dev->se_hba;
1039
1040         WARN_ON(!list_empty(&dev->dev_sep_list));
1041
1042         if (target_dev_configured(dev)) {
1043                 destroy_workqueue(dev->tmr_wq);
1044
1045                 dev->transport->destroy_device(dev);
1046
1047                 mutex_lock(&device_mutex);
1048                 idr_remove(&devices_idr, dev->dev_index);
1049                 mutex_unlock(&device_mutex);
1050
1051                 spin_lock(&hba->device_lock);
1052                 hba->dev_count--;
1053                 spin_unlock(&hba->device_lock);
1054         }
1055
1056         core_alua_free_lu_gp_mem(dev);
1057         core_alua_set_lba_map(dev, NULL, 0, 0);
1058         core_scsi3_free_all_registrations(dev);
1059         se_release_vpd_for_dev(dev);
1060
1061         if (dev->transport->free_prot)
1062                 dev->transport->free_prot(dev);
1063
1064         dev->transport->free_device(dev);
1065 }
1066
1067 int core_dev_setup_virtual_lun0(void)
1068 {
1069         struct se_hba *hba;
1070         struct se_device *dev;
1071         char buf[] = "rd_pages=8,rd_nullio=1";
1072         int ret;
1073
1074         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1075         if (IS_ERR(hba))
1076                 return PTR_ERR(hba);
1077
1078         dev = target_alloc_device(hba, "virt_lun0");
1079         if (!dev) {
1080                 ret = -ENOMEM;
1081                 goto out_free_hba;
1082         }
1083
1084         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1085
1086         ret = target_configure_device(dev);
1087         if (ret)
1088                 goto out_free_se_dev;
1089
1090         lun0_hba = hba;
1091         g_lun0_dev = dev;
1092         return 0;
1093
1094 out_free_se_dev:
1095         target_free_device(dev);
1096 out_free_hba:
1097         core_delete_hba(hba);
1098         return ret;
1099 }
1100
1101
1102 void core_dev_release_virtual_lun0(void)
1103 {
1104         struct se_hba *hba = lun0_hba;
1105
1106         if (!hba)
1107                 return;
1108
1109         if (g_lun0_dev)
1110                 target_free_device(g_lun0_dev);
1111         core_delete_hba(hba);
1112 }
1113
1114 /*
1115  * Common CDB parsing for kernel and user passthrough.
1116  */
1117 sense_reason_t
1118 passthrough_parse_cdb(struct se_cmd *cmd,
1119         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1120 {
1121         unsigned char *cdb = cmd->t_task_cdb;
1122         struct se_device *dev = cmd->se_dev;
1123         unsigned int size;
1124
1125         /*
1126          * For REPORT LUNS we always need to emulate the response, for everything
1127          * else, pass it up.
1128          */
1129         if (cdb[0] == REPORT_LUNS) {
1130                 cmd->execute_cmd = spc_emulate_report_luns;
1131                 return TCM_NO_SENSE;
1132         }
1133
1134         /*
1135          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1136          * emulate the response, since tcmu does not have the information
1137          * required to process these commands.
1138          */
1139         if (!(dev->transport->transport_flags &
1140               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1141                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1142                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1143                         size = get_unaligned_be16(&cdb[7]);
1144                         return target_cmd_size_check(cmd, size);
1145                 }
1146                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1147                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1148                         size = get_unaligned_be32(&cdb[5]);
1149                         return target_cmd_size_check(cmd, size);
1150                 }
1151
1152                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1153                         cmd->execute_cmd = target_scsi2_reservation_release;
1154                         if (cdb[0] == RELEASE_10)
1155                                 size = get_unaligned_be16(&cdb[7]);
1156                         else
1157                                 size = cmd->data_length;
1158                         return target_cmd_size_check(cmd, size);
1159                 }
1160                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1161                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1162                         if (cdb[0] == RESERVE_10)
1163                                 size = get_unaligned_be16(&cdb[7]);
1164                         else
1165                                 size = cmd->data_length;
1166                         return target_cmd_size_check(cmd, size);
1167                 }
1168         }
1169
1170         /* Set DATA_CDB flag for ops that should have it */
1171         switch (cdb[0]) {
1172         case READ_6:
1173         case READ_10:
1174         case READ_12:
1175         case READ_16:
1176         case WRITE_6:
1177         case WRITE_10:
1178         case WRITE_12:
1179         case WRITE_16:
1180         case WRITE_VERIFY:
1181         case WRITE_VERIFY_12:
1182         case WRITE_VERIFY_16:
1183         case COMPARE_AND_WRITE:
1184         case XDWRITEREAD_10:
1185                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1186                 break;
1187         case VARIABLE_LENGTH_CMD:
1188                 switch (get_unaligned_be16(&cdb[8])) {
1189                 case READ_32:
1190                 case WRITE_32:
1191                 case WRITE_VERIFY_32:
1192                 case XDWRITEREAD_32:
1193                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1194                         break;
1195                 }
1196         }
1197
1198         cmd->execute_cmd = exec_cmd;
1199
1200         return TCM_NO_SENSE;
1201 }
1202 EXPORT_SYMBOL(passthrough_parse_cdb);