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         unsigned long flags;
 168
 169         rcu_read_lock();
 170         deve = target_nacl_find_deve(nacl, unpacked_lun);
 171         if (deve) {
 172                 se_lun = rcu_dereference(deve->se_lun);
 173
 174                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 175                         se_lun = NULL;
 176                         goto out_unlock;
 177                 }
 178
 179                 se_cmd->se_lun = se_lun;
 180                 se_cmd->pr_res_key = deve->pr_res_key;
 181                 se_cmd->orig_fe_lun = unpacked_lun;
 182                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 183                 se_cmd->lun_ref_active = true;
 184         }
 185 out_unlock:
 186         rcu_read_unlock();
 187
 188         if (!se_lun) {
 189                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 190                         " Access for 0x%08llx\n",
 191                         se_cmd->se_tfo->get_fabric_name(),
 192                         unpacked_lun);
 193                 return -ENODEV;
 194         }
 195         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 196         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 197
 198         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 199         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 200         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 205
 206 bool target_lun_is_rdonly(struct se_cmd *cmd)
 207 {
 208         struct se_session *se_sess = cmd->se_sess;
 209         struct se_dev_entry *deve;
 210         bool ret;
 211
 212         rcu_read_lock();
 213         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 214         ret = deve && deve->lun_access_ro;
 215         rcu_read_unlock();
 216
 217         return ret;
 218 }
 219 EXPORT_SYMBOL(target_lun_is_rdonly);
 220
 221 /*
 222  * This function is called from core_scsi3_emulate_pro_register_and_move()
 223  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 224  * when a matching rtpi is found.
 225  */
 226 struct se_dev_entry *core_get_se_deve_from_rtpi(
 227         struct se_node_acl *nacl,
 228         u16 rtpi)
 229 {
 230         struct se_dev_entry *deve;
 231         struct se_lun *lun;
 232         struct se_portal_group *tpg = nacl->se_tpg;
 233
 234         rcu_read_lock();
 235         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 236                 lun = rcu_dereference(deve->se_lun);
 237                 if (!lun) {
 238                         pr_err("%s device entries device pointer is"
 239                                 " NULL, but Initiator has access.\n",
 240                                 tpg->se_tpg_tfo->get_fabric_name());
 241                         continue;
 242                 }
 243                 if (lun->lun_rtpi != rtpi)
 244                         continue;
 245
 246                 kref_get(&deve->pr_kref);
 247                 rcu_read_unlock();
 248
 249                 return deve;
 250         }
 251         rcu_read_unlock();
 252
 253         return NULL;
 254 }
 255
 256 void core_free_device_list_for_node(
 257         struct se_node_acl *nacl,
 258         struct se_portal_group *tpg)
 259 {
 260         struct se_dev_entry *deve;
 261
 262         mutex_lock(&nacl->lun_entry_mutex);
 263         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 264                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 265                                         lockdep_is_held(&nacl->lun_entry_mutex));
 266                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 267         }
 268         mutex_unlock(&nacl->lun_entry_mutex);
 269 }
 270
 271 void core_update_device_list_access(
 272         u64 mapped_lun,
 273         bool lun_access_ro,
 274         struct se_node_acl *nacl)
 275 {
 276         struct se_dev_entry *deve;
 277
 278         mutex_lock(&nacl->lun_entry_mutex);
 279         deve = target_nacl_find_deve(nacl, mapped_lun);
 280         if (deve)
 281                 deve->lun_access_ro = lun_access_ro;
 282         mutex_unlock(&nacl->lun_entry_mutex);
 283 }
 284
 285 /*
 286  * Called with rcu_read_lock or nacl->device_list_lock held.
 287  */
 288 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 289 {
 290         struct se_dev_entry *deve;
 291
 292         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 293                 if (deve->mapped_lun == mapped_lun)
 294                         return deve;
 295
 296         return NULL;
 297 }
 298 EXPORT_SYMBOL(target_nacl_find_deve);
 299
 300 void target_pr_kref_release(struct kref *kref)
 301 {
 302         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 303                                                  pr_kref);
 304         complete(&deve->pr_comp);
 305 }
 306
 307 static void
 308 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 309                              bool skip_new)
 310 {
 311         struct se_dev_entry *tmp;
 312
 313         rcu_read_lock();
 314         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 315                 if (skip_new && tmp == new)
 316                         continue;
 317                 core_scsi3_ua_allocate(tmp, 0x3F,
 318                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 319         }
 320         rcu_read_unlock();
 321 }
 322
 323 int core_enable_device_list_for_node(
 324         struct se_lun *lun,
 325         struct se_lun_acl *lun_acl,
 326         u64 mapped_lun,
 327         bool lun_access_ro,
 328         struct se_node_acl *nacl,
 329         struct se_portal_group *tpg)
 330 {
 331         struct se_dev_entry *orig, *new;
 332
 333         new = kzalloc(sizeof(*new), GFP_KERNEL);
 334         if (!new) {
 335                 pr_err("Unable to allocate se_dev_entry memory\n");
 336                 return -ENOMEM;
 337         }
 338
 339         atomic_set(&new->ua_count, 0);
 340         spin_lock_init(&new->ua_lock);
 341         INIT_LIST_HEAD(&new->ua_list);
 342         INIT_LIST_HEAD(&new->lun_link);
 343
 344         new->mapped_lun = mapped_lun;
 345         kref_init(&new->pr_kref);
 346         init_completion(&new->pr_comp);
 347
 348         new->lun_access_ro = lun_access_ro;
 349         new->creation_time = get_jiffies_64();
 350         new->attach_count++;
 351
 352         mutex_lock(&nacl->lun_entry_mutex);
 353         orig = target_nacl_find_deve(nacl, mapped_lun);
 354         if (orig && orig->se_lun) {
 355                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 356                                         lockdep_is_held(&nacl->lun_entry_mutex));
 357
 358                 if (orig_lun != lun) {
 359                         pr_err("Existing orig->se_lun doesn't match new lun"
 360                                " for dynamic -> explicit NodeACL conversion:"
 361                                 " %s\n", nacl->initiatorname);
 362                         mutex_unlock(&nacl->lun_entry_mutex);
 363                         kfree(new);
 364                         return -EINVAL;
 365                 }
 366                 if (orig->se_lun_acl != NULL) {
 367                         pr_warn_ratelimited("Detected existing explicit"
 368                                 " se_lun_acl->se_lun_group reference for %s"
 369                                 " mapped_lun: %llu, failing\n",
 370                                  nacl->initiatorname, mapped_lun);
 371                         mutex_unlock(&nacl->lun_entry_mutex);
 372                         kfree(new);
 373                         return -EINVAL;
 374                 }
 375
 376                 rcu_assign_pointer(new->se_lun, lun);
 377                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 378                 hlist_del_rcu(&orig->link);
 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_del(&orig->lun_link);
 384                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 385                 spin_unlock(&lun->lun_deve_lock);
 386
 387                 kref_put(&orig->pr_kref, target_pr_kref_release);
 388                 wait_for_completion(&orig->pr_comp);
 389
 390                 target_luns_data_has_changed(nacl, new, true);
 391                 kfree_rcu(orig, rcu_head);
 392                 return 0;
 393         }
 394
 395         rcu_assign_pointer(new->se_lun, lun);
 396         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 397         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 398         mutex_unlock(&nacl->lun_entry_mutex);
 399
 400         spin_lock(&lun->lun_deve_lock);
 401         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 402         spin_unlock(&lun->lun_deve_lock);
 403
 404         target_luns_data_has_changed(nacl, new, true);
 405         return 0;
 406 }
 407
 408 /*
 409  *      Called with se_node_acl->lun_entry_mutex held.
 410  */
 411 void core_disable_device_list_for_node(
 412         struct se_lun *lun,
 413         struct se_dev_entry *orig,
 414         struct se_node_acl *nacl,
 415         struct se_portal_group *tpg)
 416 {
 417         /*
 418          * rcu_dereference_raw protected by se_lun->lun_group symlink
 419          * reference to se_device->dev_group.
 420          */
 421         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 422         /*
 423          * If the MappedLUN entry is being disabled, the entry in
 424          * lun->lun_deve_list must be removed now before clearing the
 425          * struct se_dev_entry pointers below as logic in
 426          * core_alua_do_transition_tg_pt() depends on these being present.
 427          *
 428          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 429          * that have not been explicitly converted to MappedLUNs ->
 430          * struct se_lun_acl, but we remove deve->lun_link from
 431          * lun->lun_deve_list. This also means that active UAs and
 432          * NodeACL context specific PR metadata for demo-mode
 433          * MappedLUN *deve will be released below..
 434          */
 435         spin_lock(&lun->lun_deve_lock);
 436         list_del(&orig->lun_link);
 437         spin_unlock(&lun->lun_deve_lock);
 438         /*
 439          * Disable struct se_dev_entry LUN ACL mapping
 440          */
 441         core_scsi3_ua_release_all(orig);
 442
 443         hlist_del_rcu(&orig->link);
 444         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 445         orig->lun_access_ro = false;
 446         orig->creation_time = 0;
 447         orig->attach_count--;
 448         /*
 449          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 450          * or REGISTER_AND_MOVE PR operation to complete.
 451          */
 452         kref_put(&orig->pr_kref, target_pr_kref_release);
 453         wait_for_completion(&orig->pr_comp);
 454
 455         rcu_assign_pointer(orig->se_lun, NULL);
 456         rcu_assign_pointer(orig->se_lun_acl, NULL);
 457
 458         kfree_rcu(orig, rcu_head);
 459
 460         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 461         target_luns_data_has_changed(nacl, NULL, false);
 462 }
 463
 464 /*      core_clear_lun_from_tpg():
 465  *
 466  *
 467  */
 468 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 469 {
 470         struct se_node_acl *nacl;
 471         struct se_dev_entry *deve;
 472
 473         mutex_lock(&tpg->acl_node_mutex);
 474         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 475
 476                 mutex_lock(&nacl->lun_entry_mutex);
 477                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 478                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 479                                         lockdep_is_held(&nacl->lun_entry_mutex));
 480
 481                         if (lun != tmp_lun)
 482                                 continue;
 483
 484                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 485                 }
 486                 mutex_unlock(&nacl->lun_entry_mutex);
 487         }
 488         mutex_unlock(&tpg->acl_node_mutex);
 489 }
 490
 491 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 492 {
 493         struct se_lun *tmp;
 494
 495         spin_lock(&dev->se_port_lock);
 496         if (dev->export_count == 0x0000ffff) {
 497                 pr_warn("Reached dev->dev_port_count =="
 498                                 " 0x0000ffff\n");
 499                 spin_unlock(&dev->se_port_lock);
 500                 return -ENOSPC;
 501         }
 502 again:
 503         /*
 504          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 505          * Here is the table from spc4r17 section 7.7.3.8.
 506          *
 507          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 508          *
 509          * Code      Description
 510          * 0h        Reserved
 511          * 1h        Relative port 1, historically known as port A
 512          * 2h        Relative port 2, historically known as port B
 513          * 3h to FFFFh    Relative port 3 through 65 535
 514          */
 515         lun->lun_rtpi = dev->dev_rpti_counter++;
 516         if (!lun->lun_rtpi)
 517                 goto again;
 518
 519         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 520                 /*
 521                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 522                  * for 16-bit wrap..
 523                  */
 524                 if (lun->lun_rtpi == tmp->lun_rtpi)
 525                         goto again;
 526         }
 527         spin_unlock(&dev->se_port_lock);
 528
 529         return 0;
 530 }
 531
 532 static void se_release_vpd_for_dev(struct se_device *dev)
 533 {
 534         struct t10_vpd *vpd, *vpd_tmp;
 535
 536         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 537         list_for_each_entry_safe(vpd, vpd_tmp,
 538                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 539                 list_del(&vpd->vpd_list);
 540                 kfree(vpd);
 541         }
 542         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 543 }
 544
 545 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 546 {
 547         u32 aligned_max_sectors;
 548         u32 alignment;
 549         /*
 550          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 551          * transport_allocate_data_tasks() operation.
 552          */
 553         alignment = max(1ul, PAGE_SIZE / block_size);
 554         aligned_max_sectors = rounddown(max_sectors, alignment);
 555
 556         if (max_sectors != aligned_max_sectors)
 557                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 558                         max_sectors, aligned_max_sectors);
 559
 560         return aligned_max_sectors;
 561 }
 562
 563 int core_dev_add_lun(
 564         struct se_portal_group *tpg,
 565         struct se_device *dev,
 566         struct se_lun *lun)
 567 {
 568         int rc;
 569
 570         rc = core_tpg_add_lun(tpg, lun, false, dev);
 571         if (rc < 0)
 572                 return rc;
 573
 574         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 575                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 576                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 577                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 578         /*
 579          * Update LUN maps for dynamically added initiators when
 580          * generate_node_acl is enabled.
 581          */
 582         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 583                 struct se_node_acl *acl;
 584
 585                 mutex_lock(&tpg->acl_node_mutex);
 586                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 587                         if (acl->dynamic_node_acl &&
 588                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 589                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 590                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 591                         }
 592                 }
 593                 mutex_unlock(&tpg->acl_node_mutex);
 594         }
 595
 596         return 0;
 597 }
 598
 599 /*      core_dev_del_lun():
 600  *
 601  *
 602  */
 603 void core_dev_del_lun(
 604         struct se_portal_group *tpg,
 605         struct se_lun *lun)
 606 {
 607         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 608                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 609                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 610                 tpg->se_tpg_tfo->get_fabric_name());
 611
 612         core_tpg_remove_lun(tpg, lun);
 613 }
 614
 615 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 616         struct se_portal_group *tpg,
 617         struct se_node_acl *nacl,
 618         u64 mapped_lun,
 619         int *ret)
 620 {
 621         struct se_lun_acl *lacl;
 622
 623         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 624                 pr_err("%s InitiatorName exceeds maximum size.\n",
 625                         tpg->se_tpg_tfo->get_fabric_name());
 626                 *ret = -EOVERFLOW;
 627                 return NULL;
 628         }
 629         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 630         if (!lacl) {
 631                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 632                 *ret = -ENOMEM;
 633                 return NULL;
 634         }
 635
 636         lacl->mapped_lun = mapped_lun;
 637         lacl->se_lun_nacl = nacl;
 638
 639         return lacl;
 640 }
 641
 642 int core_dev_add_initiator_node_lun_acl(
 643         struct se_portal_group *tpg,
 644         struct se_lun_acl *lacl,
 645         struct se_lun *lun,
 646         bool lun_access_ro)
 647 {
 648         struct se_node_acl *nacl = lacl->se_lun_nacl;
 649         /*
 650          * rcu_dereference_raw protected by se_lun->lun_group symlink
 651          * reference to se_device->dev_group.
 652          */
 653         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 654
 655         if (!nacl)
 656                 return -EINVAL;
 657
 658         if (lun->lun_access_ro)
 659                 lun_access_ro = true;
 660
 661         lacl->se_lun = lun;
 662
 663         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 664                         lun_access_ro, nacl, tpg) < 0)
 665                 return -EINVAL;
 666
 667         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 668                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 669                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 670                 lun_access_ro ? "RO" : "RW",
 671                 nacl->initiatorname);
 672         /*
 673          * Check to see if there are any existing persistent reservation APTPL
 674          * pre-registrations that need to be enabled for this LUN ACL..
 675          */
 676         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 677                                             lacl->mapped_lun);
 678         return 0;
 679 }
 680
 681 int core_dev_del_initiator_node_lun_acl(
 682         struct se_lun *lun,
 683         struct se_lun_acl *lacl)
 684 {
 685         struct se_portal_group *tpg = lun->lun_tpg;
 686         struct se_node_acl *nacl;
 687         struct se_dev_entry *deve;
 688
 689         nacl = lacl->se_lun_nacl;
 690         if (!nacl)
 691                 return -EINVAL;
 692
 693         mutex_lock(&nacl->lun_entry_mutex);
 694         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 695         if (deve)
 696                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 697         mutex_unlock(&nacl->lun_entry_mutex);
 698
 699         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 700                 " InitiatorNode: %s Mapped LUN: %llu\n",
 701                 tpg->se_tpg_tfo->get_fabric_name(),
 702                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 703                 nacl->initiatorname, lacl->mapped_lun);
 704
 705         return 0;
 706 }
 707
 708 void core_dev_free_initiator_node_lun_acl(
 709         struct se_portal_group *tpg,
 710         struct se_lun_acl *lacl)
 711 {
 712         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 713                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 714                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 715                 tpg->se_tpg_tfo->get_fabric_name(),
 716                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 717
 718         kfree(lacl);
 719 }
 720
 721 static void scsi_dump_inquiry(struct se_device *dev)
 722 {
 723         struct t10_wwn *wwn = &dev->t10_wwn;
 724         char buf[17];
 725         int i, device_type;
 726         /*
 727          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 728          */
 729         for (i = 0; i < 8; i++)
 730                 if (wwn->vendor[i] >= 0x20)
 731                         buf[i] = wwn->vendor[i];
 732                 else
 733                         buf[i] = ' ';
 734         buf[i] = '\0';
 735         pr_debug("  Vendor: %s\n", buf);
 736
 737         for (i = 0; i < 16; i++)
 738                 if (wwn->model[i] >= 0x20)
 739                         buf[i] = wwn->model[i];
 740                 else
 741                         buf[i] = ' ';
 742         buf[i] = '\0';
 743         pr_debug("  Model: %s\n", buf);
 744
 745         for (i = 0; i < 4; i++)
 746                 if (wwn->revision[i] >= 0x20)
 747                         buf[i] = wwn->revision[i];
 748                 else
 749                         buf[i] = ' ';
 750         buf[i] = '\0';
 751         pr_debug("  Revision: %s\n", buf);
 752
 753         device_type = dev->transport->get_device_type(dev);
 754         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 755 }
 756
 757 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 758 {
 759         struct se_device *dev;
 760         struct se_lun *xcopy_lun;
 761
 762         dev = hba->backend->ops->alloc_device(hba, name);
 763         if (!dev)
 764                 return NULL;
 765
 766         dev->se_hba = hba;
 767         dev->transport = hba->backend->ops;
 768         dev->prot_length = sizeof(struct t10_pi_tuple);
 769         dev->hba_index = hba->hba_index;
 770
 771         INIT_LIST_HEAD(&dev->dev_sep_list);
 772         INIT_LIST_HEAD(&dev->dev_tmr_list);
 773         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 774         INIT_LIST_HEAD(&dev->state_list);
 775         INIT_LIST_HEAD(&dev->qf_cmd_list);
 776         spin_lock_init(&dev->execute_task_lock);
 777         spin_lock_init(&dev->delayed_cmd_lock);
 778         spin_lock_init(&dev->dev_reservation_lock);
 779         spin_lock_init(&dev->se_port_lock);
 780         spin_lock_init(&dev->se_tmr_lock);
 781         spin_lock_init(&dev->qf_cmd_lock);
 782         sema_init(&dev->caw_sem, 1);
 783         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 784         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 785         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 786         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 787         spin_lock_init(&dev->t10_pr.registration_lock);
 788         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 789         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 790         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 791         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 792         spin_lock_init(&dev->t10_alua.lba_map_lock);
 793
 794         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 795
 796         dev->t10_wwn.t10_dev = dev;
 797         dev->t10_alua.t10_dev = dev;
 798
 799         dev->dev_attrib.da_dev = dev;
 800         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 801         dev->dev_attrib.emulate_dpo = 1;
 802         dev->dev_attrib.emulate_fua_write = 1;
 803         dev->dev_attrib.emulate_fua_read = 1;
 804         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 805         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 806         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 807         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 808         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 809         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 810         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 811         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 812         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 813         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 814         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 815         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 816         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 817         dev->dev_attrib.max_unmap_block_desc_count =
 818                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 819         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 820         dev->dev_attrib.unmap_granularity_alignment =
 821                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 822         dev->dev_attrib.unmap_zeroes_data =
 823                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 824         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 825
 826         xcopy_lun = &dev->xcopy_lun;
 827         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 828         init_completion(&xcopy_lun->lun_ref_comp);
 829         init_completion(&xcopy_lun->lun_shutdown_comp);
 830         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 831         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 832         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 833         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 834
 835         return dev;
 836 }
 837
 838 /*
 839  * Check if the underlying struct block_device request_queue supports
 840  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 841  * in ATA and we need to set TPE=1
 842  */
 843 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 844                                        struct request_queue *q)
 845 {
 846         int block_size = queue_logical_block_size(q);
 847
 848         if (!blk_queue_discard(q))
 849                 return false;
 850
 851         attrib->max_unmap_lba_count =
 852                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 853         /*
 854          * Currently hardcoded to 1 in Linux/SCSI code..
 855          */
 856         attrib->max_unmap_block_desc_count = 1;
 857         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 858         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 859                                                                 block_size;
 860         attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
 861         return true;
 862 }
 863 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 864
 865 /*
 866  * Convert from blocksize advertised to the initiator to the 512 byte
 867  * units unconditionally used by the Linux block layer.
 868  */
 869 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 870 {
 871         switch (dev->dev_attrib.block_size) {
 872         case 4096:
 873                 return lb << 3;
 874         case 2048:
 875                 return lb << 2;
 876         case 1024:
 877                 return lb << 1;
 878         default:
 879                 return lb;
 880         }
 881 }
 882 EXPORT_SYMBOL(target_to_linux_sector);
 883
 884 /**
 885  * target_find_device - find a se_device by its dev_index
 886  * @id: dev_index
 887  * @do_depend: true if caller needs target_depend_item to be done
 888  *
 889  * If do_depend is true, the caller must do a target_undepend_item
 890  * when finished using the device.
 891  *
 892  * If do_depend is false, the caller must be called in a configfs
 893  * callback or during removal.
 894  */
 895 struct se_device *target_find_device(int id, bool do_depend)
 896 {
 897         struct se_device *dev;
 898
 899         mutex_lock(&device_mutex);
 900         dev = idr_find(&devices_idr, id);
 901         if (dev && do_depend && target_depend_item(&dev->dev_group.cg_item))
 902                 dev = NULL;
 903         mutex_unlock(&device_mutex);
 904         return dev;
 905 }
 906 EXPORT_SYMBOL(target_find_device);
 907
 908 struct devices_idr_iter {
 909         struct config_item *prev_item;
 910         int (*fn)(struct se_device *dev, void *data);
 911         void *data;
 912 };
 913
 914 static int target_devices_idr_iter(int id, void *p, void *data)
 915          __must_hold(&device_mutex)
 916 {
 917         struct devices_idr_iter *iter = data;
 918         struct se_device *dev = p;
 919         int ret;
 920
 921         config_item_put(iter->prev_item);
 922         iter->prev_item = NULL;
 923
 924         /*
 925          * We add the device early to the idr, so it can be used
 926          * by backend modules during configuration. We do not want
 927          * to allow other callers to access partially setup devices,
 928          * so we skip them here.
 929          */
 930         if (!(dev->dev_flags & DF_CONFIGURED))
 931                 return 0;
 932
 933         iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 934         if (!iter->prev_item)
 935                 return 0;
 936         mutex_unlock(&device_mutex);
 937
 938         ret = iter->fn(dev, iter->data);
 939
 940         mutex_lock(&device_mutex);
 941         return ret;
 942 }
 943
 944 /**
 945  * target_for_each_device - iterate over configured devices
 946  * @fn: iterator function
 947  * @data: pointer to data that will be passed to fn
 948  *
 949  * fn must return 0 to continue looping over devices. non-zero will break
 950  * from the loop and return that value to the caller.
 951  */
 952 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 953                            void *data)
 954 {
 955         struct devices_idr_iter iter = { .fn = fn, .data = data };
 956         int ret;
 957
 958         mutex_lock(&device_mutex);
 959         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 960         mutex_unlock(&device_mutex);
 961         config_item_put(iter.prev_item);
 962         return ret;
 963 }
 964
 965 int target_configure_device(struct se_device *dev)
 966 {
 967         struct se_hba *hba = dev->se_hba;
 968         int ret, id;
 969
 970         if (dev->dev_flags & DF_CONFIGURED) {
 971                 pr_err("se_dev->se_dev_ptr already set for storage"
 972                                 " object\n");
 973                 return -EEXIST;
 974         }
 975
 976         /*
 977          * Add early so modules like tcmu can use during its
 978          * configuration.
 979          */
 980         mutex_lock(&device_mutex);
 981         /*
 982          * Use cyclic to try and avoid collisions with devices
 983          * that were recently removed.
 984          */
 985         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 986         mutex_unlock(&device_mutex);
 987         if (id < 0) {
 988                 ret = -ENOMEM;
 989                 goto out;
 990         }
 991         dev->dev_index = id;
 992
 993         ret = dev->transport->configure_device(dev);
 994         if (ret)
 995                 goto out_free_index;
 996         /*
 997          * XXX: there is not much point to have two different values here..
 998          */
 999         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1000         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1001
1002         /*
1003          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1004          */
1005         dev->dev_attrib.hw_max_sectors =
1006                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1007                                          dev->dev_attrib.hw_block_size);
1008         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1009
1010         dev->creation_time = get_jiffies_64();
1011
1012         ret = core_setup_alua(dev);
1013         if (ret)
1014                 goto out_free_index;
1015
1016         /*
1017          * Startup the struct se_device processing thread
1018          */
1019         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1020                                       dev->transport->name);
1021         if (!dev->tmr_wq) {
1022                 pr_err("Unable to create tmr workqueue for %s\n",
1023                         dev->transport->name);
1024                 ret = -ENOMEM;
1025                 goto out_free_alua;
1026         }
1027
1028         /*
1029          * Setup work_queue for QUEUE_FULL
1030          */
1031         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1032
1033         /*
1034          * Preload the initial INQUIRY const values if we are doing
1035          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1036          * passthrough because this is being provided by the backend LLD.
1037          */
1038         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1039                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1040                 strncpy(&dev->t10_wwn.model[0],
1041                         dev->transport->inquiry_prod, 16);
1042                 strncpy(&dev->t10_wwn.revision[0],
1043                         dev->transport->inquiry_rev, 4);
1044         }
1045
1046         scsi_dump_inquiry(dev);
1047
1048         spin_lock(&hba->device_lock);
1049         hba->dev_count++;
1050         spin_unlock(&hba->device_lock);
1051
1052         dev->dev_flags |= DF_CONFIGURED;
1053
1054         return 0;
1055
1056 out_free_alua:
1057         core_alua_free_lu_gp_mem(dev);
1058 out_free_index:
1059         mutex_lock(&device_mutex);
1060         idr_remove(&devices_idr, dev->dev_index);
1061         mutex_unlock(&device_mutex);
1062 out:
1063         se_release_vpd_for_dev(dev);
1064         return ret;
1065 }
1066
1067 void target_free_device(struct se_device *dev)
1068 {
1069         struct se_hba *hba = dev->se_hba;
1070
1071         WARN_ON(!list_empty(&dev->dev_sep_list));
1072
1073         if (dev->dev_flags & DF_CONFIGURED) {
1074                 destroy_workqueue(dev->tmr_wq);
1075
1076                 dev->transport->destroy_device(dev);
1077
1078                 mutex_lock(&device_mutex);
1079                 idr_remove(&devices_idr, dev->dev_index);
1080                 mutex_unlock(&device_mutex);
1081
1082                 spin_lock(&hba->device_lock);
1083                 hba->dev_count--;
1084                 spin_unlock(&hba->device_lock);
1085         }
1086
1087         core_alua_free_lu_gp_mem(dev);
1088         core_alua_set_lba_map(dev, NULL, 0, 0);
1089         core_scsi3_free_all_registrations(dev);
1090         se_release_vpd_for_dev(dev);
1091
1092         if (dev->transport->free_prot)
1093                 dev->transport->free_prot(dev);
1094
1095         dev->transport->free_device(dev);
1096 }
1097
1098 int core_dev_setup_virtual_lun0(void)
1099 {
1100         struct se_hba *hba;
1101         struct se_device *dev;
1102         char buf[] = "rd_pages=8,rd_nullio=1";
1103         int ret;
1104
1105         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1106         if (IS_ERR(hba))
1107                 return PTR_ERR(hba);
1108
1109         dev = target_alloc_device(hba, "virt_lun0");
1110         if (!dev) {
1111                 ret = -ENOMEM;
1112                 goto out_free_hba;
1113         }
1114
1115         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1116
1117         ret = target_configure_device(dev);
1118         if (ret)
1119                 goto out_free_se_dev;
1120
1121         lun0_hba = hba;
1122         g_lun0_dev = dev;
1123         return 0;
1124
1125 out_free_se_dev:
1126         target_free_device(dev);
1127 out_free_hba:
1128         core_delete_hba(hba);
1129         return ret;
1130 }
1131
1132
1133 void core_dev_release_virtual_lun0(void)
1134 {
1135         struct se_hba *hba = lun0_hba;
1136
1137         if (!hba)
1138                 return;
1139
1140         if (g_lun0_dev)
1141                 target_free_device(g_lun0_dev);
1142         core_delete_hba(hba);
1143 }
1144
1145 /*
1146  * Common CDB parsing for kernel and user passthrough.
1147  */
1148 sense_reason_t
1149 passthrough_parse_cdb(struct se_cmd *cmd,
1150         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1151 {
1152         unsigned char *cdb = cmd->t_task_cdb;
1153         struct se_device *dev = cmd->se_dev;
1154         unsigned int size;
1155
1156         /*
1157          * For REPORT LUNS we always need to emulate the response, for everything
1158          * else, pass it up.
1159          */
1160         if (cdb[0] == REPORT_LUNS) {
1161                 cmd->execute_cmd = spc_emulate_report_luns;
1162                 return TCM_NO_SENSE;
1163         }
1164
1165         /*
1166          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1167          * emulate the response, since tcmu does not have the information
1168          * required to process these commands.
1169          */
1170         if (!(dev->transport->transport_flags &
1171               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1172                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1173                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1174                         size = get_unaligned_be16(&cdb[7]);
1175                         return target_cmd_size_check(cmd, size);
1176                 }
1177                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1178                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1179                         size = get_unaligned_be32(&cdb[5]);
1180                         return target_cmd_size_check(cmd, size);
1181                 }
1182
1183                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1184                         cmd->execute_cmd = target_scsi2_reservation_release;
1185                         if (cdb[0] == RELEASE_10)
1186                                 size = get_unaligned_be16(&cdb[7]);
1187                         else
1188                                 size = cmd->data_length;
1189                         return target_cmd_size_check(cmd, size);
1190                 }
1191                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1192                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1193                         if (cdb[0] == RESERVE_10)
1194                                 size = get_unaligned_be16(&cdb[7]);
1195                         else
1196                                 size = cmd->data_length;
1197                         return target_cmd_size_check(cmd, size);
1198                 }
1199         }
1200
1201         /* Set DATA_CDB flag for ops that should have it */
1202         switch (cdb[0]) {
1203         case READ_6:
1204         case READ_10:
1205         case READ_12:
1206         case READ_16:
1207         case WRITE_6:
1208         case WRITE_10:
1209         case WRITE_12:
1210         case WRITE_16:
1211         case WRITE_VERIFY:
1212         case WRITE_VERIFY_12:
1213         case WRITE_VERIFY_16:
1214         case COMPARE_AND_WRITE:
1215         case XDWRITEREAD_10:
1216                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1217                 break;
1218         case VARIABLE_LENGTH_CMD:
1219                 switch (get_unaligned_be16(&cdb[8])) {
1220                 case READ_32:
1221                 case WRITE_32:
1222                 case WRITE_VERIFY_32:
1223                 case XDWRITEREAD_32:
1224                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1225                         break;
1226                 }
1227         }
1228
1229         cmd->execute_cmd = exec_cmd;
1230
1231         return TCM_NO_SENSE;
1232 }
1233 EXPORT_SYMBOL(passthrough_parse_cdb);