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 <asm/unaligned.h>
  37 #include <net/sock.h>
  38 #include <net/tcp.h>
  39 #include <scsi/scsi_common.h>
  40 #include <scsi/scsi_proto.h>
  41
  42 #include <target/target_core_base.h>
  43 #include <target/target_core_backend.h>
  44 #include <target/target_core_fabric.h>
  45
  46 #include "target_core_internal.h"
  47 #include "target_core_alua.h"
  48 #include "target_core_pr.h"
  49 #include "target_core_ua.h"
  50
  51 DEFINE_MUTEX(g_device_mutex);
  52 LIST_HEAD(g_device_list);
  53
  54 static struct se_hba *lun0_hba;
  55 /* not static, needed by tpg.c */
  56 struct se_device *g_lun0_dev;
  57
  58 sense_reason_t
  59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
  60 {
  61         struct se_lun *se_lun = NULL;
  62         struct se_session *se_sess = se_cmd->se_sess;
  63         struct se_node_acl *nacl = se_sess->se_node_acl;
  64         struct se_dev_entry *deve;
  65         sense_reason_t ret = TCM_NO_SENSE;
  66
  67         rcu_read_lock();
  68         deve = target_nacl_find_deve(nacl, unpacked_lun);
  69         if (deve) {
  70                 atomic_long_inc(&deve->total_cmds);
  71
  72                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  73                         atomic_long_add(se_cmd->data_length,
  74                                         &deve->write_bytes);
  75                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  76                         atomic_long_add(se_cmd->data_length,
  77                                         &deve->read_bytes);
  78
  79                 se_lun = rcu_dereference(deve->se_lun);
  80                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
  81                 se_cmd->pr_res_key = deve->pr_res_key;
  82                 se_cmd->orig_fe_lun = unpacked_lun;
  83                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  84
  85                 percpu_ref_get(&se_lun->lun_ref);
  86                 se_cmd->lun_ref_active = true;
  87
  88                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  89                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  90                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  91                                 " Access for 0x%08llx\n",
  92                                 se_cmd->se_tfo->get_fabric_name(),
  93                                 unpacked_lun);
  94                         rcu_read_unlock();
  95                         ret = TCM_WRITE_PROTECTED;
  96                         goto ref_dev;
  97                 }
  98         }
  99         rcu_read_unlock();
 100
 101         if (!se_lun) {
 102                 /*
 103                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 104                  * REPORT_LUNS, et al to be returned when no active
 105                  * MappedLUN=0 exists for this Initiator Port.
 106                  */
 107                 if (unpacked_lun != 0) {
 108                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 109                                 " Access for 0x%08llx\n",
 110                                 se_cmd->se_tfo->get_fabric_name(),
 111                                 unpacked_lun);
 112                         return TCM_NON_EXISTENT_LUN;
 113                 }
 114
 115                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 116                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 117                 se_cmd->orig_fe_lun = 0;
 118                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 119
 120                 percpu_ref_get(&se_lun->lun_ref);
 121                 se_cmd->lun_ref_active = true;
 122
 123                 /*
 124                  * Force WRITE PROTECT for virtual LUN 0
 125                  */
 126                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 127                     (se_cmd->data_direction != DMA_NONE)) {
 128                         ret = TCM_WRITE_PROTECTED;
 129                         goto ref_dev;
 130                 }
 131         }
 132         /*
 133          * RCU reference protected by percpu se_lun->lun_ref taken above that
 134          * must drop to zero (including initial reference) before this se_lun
 135          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 136          * target_core_fabric_configfs.c:target_fabric_port_release
 137          */
 138 ref_dev:
 139         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 140         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 141
 142         if (se_cmd->data_direction == DMA_TO_DEVICE)
 143                 atomic_long_add(se_cmd->data_length,
 144                                 &se_cmd->se_dev->write_bytes);
 145         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 146                 atomic_long_add(se_cmd->data_length,
 147                                 &se_cmd->se_dev->read_bytes);
 148
 149         return ret;
 150 }
 151 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 152
 153 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 154 {
 155         struct se_dev_entry *deve;
 156         struct se_lun *se_lun = NULL;
 157         struct se_session *se_sess = se_cmd->se_sess;
 158         struct se_node_acl *nacl = se_sess->se_node_acl;
 159         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 160         unsigned long flags;
 161
 162         rcu_read_lock();
 163         deve = target_nacl_find_deve(nacl, unpacked_lun);
 164         if (deve) {
 165                 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
 166                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
 167                 se_lun = rcu_dereference(deve->se_lun);
 168                 se_cmd->pr_res_key = deve->pr_res_key;
 169                 se_cmd->orig_fe_lun = unpacked_lun;
 170         }
 171         rcu_read_unlock();
 172
 173         if (!se_lun) {
 174                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 175                         " Access for 0x%08llx\n",
 176                         se_cmd->se_tfo->get_fabric_name(),
 177                         unpacked_lun);
 178                 return -ENODEV;
 179         }
 180         /*
 181          * XXX: Add percpu se_lun->lun_ref reference count for TMR
 182          */
 183         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 184         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 185
 186         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 187         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 188         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 189
 190         return 0;
 191 }
 192 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 193
 194 bool target_lun_is_rdonly(struct se_cmd *cmd)
 195 {
 196         struct se_session *se_sess = cmd->se_sess;
 197         struct se_dev_entry *deve;
 198         bool ret;
 199
 200         rcu_read_lock();
 201         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 202         ret = (deve && deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
 203         rcu_read_unlock();
 204
 205         return ret;
 206 }
 207 EXPORT_SYMBOL(target_lun_is_rdonly);
 208
 209 /*
 210  * This function is called from core_scsi3_emulate_pro_register_and_move()
 211  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 212  * when a matching rtpi is found.
 213  */
 214 struct se_dev_entry *core_get_se_deve_from_rtpi(
 215         struct se_node_acl *nacl,
 216         u16 rtpi)
 217 {
 218         struct se_dev_entry *deve;
 219         struct se_lun *lun;
 220         struct se_portal_group *tpg = nacl->se_tpg;
 221
 222         rcu_read_lock();
 223         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 224                 lun = rcu_dereference(deve->se_lun);
 225                 if (!lun) {
 226                         pr_err("%s device entries device pointer is"
 227                                 " NULL, but Initiator has access.\n",
 228                                 tpg->se_tpg_tfo->get_fabric_name());
 229                         continue;
 230                 }
 231                 if (lun->lun_rtpi != rtpi)
 232                         continue;
 233
 234                 kref_get(&deve->pr_kref);
 235                 rcu_read_unlock();
 236
 237                 return deve;
 238         }
 239         rcu_read_unlock();
 240
 241         return NULL;
 242 }
 243
 244 void core_free_device_list_for_node(
 245         struct se_node_acl *nacl,
 246         struct se_portal_group *tpg)
 247 {
 248         struct se_dev_entry *deve;
 249
 250         mutex_lock(&nacl->lun_entry_mutex);
 251         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 252                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 253                                         lockdep_is_held(&nacl->lun_entry_mutex));
 254                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 255         }
 256         mutex_unlock(&nacl->lun_entry_mutex);
 257 }
 258
 259 void core_update_device_list_access(
 260         u64 mapped_lun,
 261         u32 lun_access,
 262         struct se_node_acl *nacl)
 263 {
 264         struct se_dev_entry *deve;
 265
 266         mutex_lock(&nacl->lun_entry_mutex);
 267         deve = target_nacl_find_deve(nacl, mapped_lun);
 268         if (deve) {
 269                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 270                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 271                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 272                 } else {
 273                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 274                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 275                 }
 276         }
 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         u32 lun_access,
 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         atomic_set(&new->ua_count, 0);
 335         spin_lock_init(&new->ua_lock);
 336         INIT_LIST_HEAD(&new->ua_list);
 337         INIT_LIST_HEAD(&new->lun_link);
 338
 339         new->mapped_lun = mapped_lun;
 340         kref_init(&new->pr_kref);
 341         init_completion(&new->pr_comp);
 342
 343         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
 344                 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 345         else
 346                 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 347
 348         new->creation_time = get_jiffies_64();
 349         new->attach_count++;
 350
 351         mutex_lock(&nacl->lun_entry_mutex);
 352         orig = target_nacl_find_deve(nacl, mapped_lun);
 353         if (orig && orig->se_lun) {
 354                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 355                                         lockdep_is_held(&nacl->lun_entry_mutex));
 356
 357                 if (orig_lun != lun) {
 358                         pr_err("Existing orig->se_lun doesn't match new lun"
 359                                " for dynamic -> explicit NodeACL conversion:"
 360                                 " %s\n", nacl->initiatorname);
 361                         mutex_unlock(&nacl->lun_entry_mutex);
 362                         kfree(new);
 363                         return -EINVAL;
 364                 }
 365                 BUG_ON(orig->se_lun_acl != NULL);
 366
 367                 rcu_assign_pointer(new->se_lun, lun);
 368                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 369                 hlist_del_rcu(&orig->link);
 370                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 371                 mutex_unlock(&nacl->lun_entry_mutex);
 372
 373                 spin_lock(&lun->lun_deve_lock);
 374                 list_del(&orig->lun_link);
 375                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 376                 spin_unlock(&lun->lun_deve_lock);
 377
 378                 kref_put(&orig->pr_kref, target_pr_kref_release);
 379                 wait_for_completion(&orig->pr_comp);
 380
 381                 target_luns_data_has_changed(nacl, new, true);
 382                 kfree_rcu(orig, rcu_head);
 383                 return 0;
 384         }
 385
 386         rcu_assign_pointer(new->se_lun, lun);
 387         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 388         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 389         mutex_unlock(&nacl->lun_entry_mutex);
 390
 391         spin_lock(&lun->lun_deve_lock);
 392         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 393         spin_unlock(&lun->lun_deve_lock);
 394
 395         target_luns_data_has_changed(nacl, new, true);
 396         return 0;
 397 }
 398
 399 /*
 400  *      Called with se_node_acl->lun_entry_mutex held.
 401  */
 402 void core_disable_device_list_for_node(
 403         struct se_lun *lun,
 404         struct se_dev_entry *orig,
 405         struct se_node_acl *nacl,
 406         struct se_portal_group *tpg)
 407 {
 408         /*
 409          * rcu_dereference_raw protected by se_lun->lun_group symlink
 410          * reference to se_device->dev_group.
 411          */
 412         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 413         /*
 414          * If the MappedLUN entry is being disabled, the entry in
 415          * lun->lun_deve_list must be removed now before clearing the
 416          * struct se_dev_entry pointers below as logic in
 417          * core_alua_do_transition_tg_pt() depends on these being present.
 418          *
 419          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 420          * that have not been explicitly converted to MappedLUNs ->
 421          * struct se_lun_acl, but we remove deve->lun_link from
 422          * lun->lun_deve_list. This also means that active UAs and
 423          * NodeACL context specific PR metadata for demo-mode
 424          * MappedLUN *deve will be released below..
 425          */
 426         spin_lock(&lun->lun_deve_lock);
 427         list_del(&orig->lun_link);
 428         spin_unlock(&lun->lun_deve_lock);
 429         /*
 430          * Disable struct se_dev_entry LUN ACL mapping
 431          */
 432         core_scsi3_ua_release_all(orig);
 433
 434         hlist_del_rcu(&orig->link);
 435         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 436         orig->lun_flags = 0;
 437         orig->creation_time = 0;
 438         orig->attach_count--;
 439         /*
 440          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 441          * or REGISTER_AND_MOVE PR operation to complete.
 442          */
 443         kref_put(&orig->pr_kref, target_pr_kref_release);
 444         wait_for_completion(&orig->pr_comp);
 445
 446         rcu_assign_pointer(orig->se_lun, NULL);
 447         rcu_assign_pointer(orig->se_lun_acl, NULL);
 448
 449         kfree_rcu(orig, rcu_head);
 450
 451         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 452         target_luns_data_has_changed(nacl, NULL, false);
 453 }
 454
 455 /*      core_clear_lun_from_tpg():
 456  *
 457  *
 458  */
 459 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 460 {
 461         struct se_node_acl *nacl;
 462         struct se_dev_entry *deve;
 463
 464         mutex_lock(&tpg->acl_node_mutex);
 465         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 466
 467                 mutex_lock(&nacl->lun_entry_mutex);
 468                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 469                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 470                                         lockdep_is_held(&nacl->lun_entry_mutex));
 471
 472                         if (lun != tmp_lun)
 473                                 continue;
 474
 475                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 476                 }
 477                 mutex_unlock(&nacl->lun_entry_mutex);
 478         }
 479         mutex_unlock(&tpg->acl_node_mutex);
 480 }
 481
 482 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 483 {
 484         struct se_lun *tmp;
 485
 486         spin_lock(&dev->se_port_lock);
 487         if (dev->export_count == 0x0000ffff) {
 488                 pr_warn("Reached dev->dev_port_count =="
 489                                 " 0x0000ffff\n");
 490                 spin_unlock(&dev->se_port_lock);
 491                 return -ENOSPC;
 492         }
 493 again:
 494         /*
 495          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 496          * Here is the table from spc4r17 section 7.7.3.8.
 497          *
 498          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 499          *
 500          * Code      Description
 501          * 0h        Reserved
 502          * 1h        Relative port 1, historically known as port A
 503          * 2h        Relative port 2, historically known as port B
 504          * 3h to FFFFh    Relative port 3 through 65 535
 505          */
 506         lun->lun_rtpi = dev->dev_rpti_counter++;
 507         if (!lun->lun_rtpi)
 508                 goto again;
 509
 510         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 511                 /*
 512                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 513                  * for 16-bit wrap..
 514                  */
 515                 if (lun->lun_rtpi == tmp->lun_rtpi)
 516                         goto again;
 517         }
 518         spin_unlock(&dev->se_port_lock);
 519
 520         return 0;
 521 }
 522
 523 static void se_release_vpd_for_dev(struct se_device *dev)
 524 {
 525         struct t10_vpd *vpd, *vpd_tmp;
 526
 527         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 528         list_for_each_entry_safe(vpd, vpd_tmp,
 529                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 530                 list_del(&vpd->vpd_list);
 531                 kfree(vpd);
 532         }
 533         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 534 }
 535
 536 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 537 {
 538         u32 aligned_max_sectors;
 539         u32 alignment;
 540         /*
 541          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 542          * transport_allocate_data_tasks() operation.
 543          */
 544         alignment = max(1ul, PAGE_SIZE / block_size);
 545         aligned_max_sectors = rounddown(max_sectors, alignment);
 546
 547         if (max_sectors != aligned_max_sectors)
 548                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 549                         max_sectors, aligned_max_sectors);
 550
 551         return aligned_max_sectors;
 552 }
 553
 554 int core_dev_add_lun(
 555         struct se_portal_group *tpg,
 556         struct se_device *dev,
 557         struct se_lun *lun)
 558 {
 559         int rc;
 560
 561         rc = core_tpg_add_lun(tpg, lun,
 562                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
 563         if (rc < 0)
 564                 return rc;
 565
 566         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 567                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 568                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 569                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 570         /*
 571          * Update LUN maps for dynamically added initiators when
 572          * generate_node_acl is enabled.
 573          */
 574         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 575                 struct se_node_acl *acl;
 576
 577                 mutex_lock(&tpg->acl_node_mutex);
 578                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 579                         if (acl->dynamic_node_acl &&
 580                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 581                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 582                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 583                         }
 584                 }
 585                 mutex_unlock(&tpg->acl_node_mutex);
 586         }
 587
 588         return 0;
 589 }
 590
 591 /*      core_dev_del_lun():
 592  *
 593  *
 594  */
 595 void core_dev_del_lun(
 596         struct se_portal_group *tpg,
 597         struct se_lun *lun)
 598 {
 599         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 600                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 601                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 602                 tpg->se_tpg_tfo->get_fabric_name());
 603
 604         core_tpg_remove_lun(tpg, lun);
 605 }
 606
 607 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 608         struct se_portal_group *tpg,
 609         struct se_node_acl *nacl,
 610         u64 mapped_lun,
 611         int *ret)
 612 {
 613         struct se_lun_acl *lacl;
 614
 615         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 616                 pr_err("%s InitiatorName exceeds maximum size.\n",
 617                         tpg->se_tpg_tfo->get_fabric_name());
 618                 *ret = -EOVERFLOW;
 619                 return NULL;
 620         }
 621         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 622         if (!lacl) {
 623                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 624                 *ret = -ENOMEM;
 625                 return NULL;
 626         }
 627
 628         lacl->mapped_lun = mapped_lun;
 629         lacl->se_lun_nacl = nacl;
 630
 631         return lacl;
 632 }
 633
 634 int core_dev_add_initiator_node_lun_acl(
 635         struct se_portal_group *tpg,
 636         struct se_lun_acl *lacl,
 637         struct se_lun *lun,
 638         u32 lun_access)
 639 {
 640         struct se_node_acl *nacl = lacl->se_lun_nacl;
 641         /*
 642          * rcu_dereference_raw protected by se_lun->lun_group symlink
 643          * reference to se_device->dev_group.
 644          */
 645         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 646
 647         if (!nacl)
 648                 return -EINVAL;
 649
 650         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
 651             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
 652                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 653
 654         lacl->se_lun = lun;
 655
 656         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 657                         lun_access, nacl, tpg) < 0)
 658                 return -EINVAL;
 659
 660         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 661                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 662                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 663                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
 664                 nacl->initiatorname);
 665         /*
 666          * Check to see if there are any existing persistent reservation APTPL
 667          * pre-registrations that need to be enabled for this LUN ACL..
 668          */
 669         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 670                                             lacl->mapped_lun);
 671         return 0;
 672 }
 673
 674 int core_dev_del_initiator_node_lun_acl(
 675         struct se_lun *lun,
 676         struct se_lun_acl *lacl)
 677 {
 678         struct se_portal_group *tpg = lun->lun_tpg;
 679         struct se_node_acl *nacl;
 680         struct se_dev_entry *deve;
 681
 682         nacl = lacl->se_lun_nacl;
 683         if (!nacl)
 684                 return -EINVAL;
 685
 686         mutex_lock(&nacl->lun_entry_mutex);
 687         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 688         if (deve)
 689                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 690         mutex_unlock(&nacl->lun_entry_mutex);
 691
 692         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 693                 " InitiatorNode: %s Mapped LUN: %llu\n",
 694                 tpg->se_tpg_tfo->get_fabric_name(),
 695                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 696                 nacl->initiatorname, lacl->mapped_lun);
 697
 698         return 0;
 699 }
 700
 701 void core_dev_free_initiator_node_lun_acl(
 702         struct se_portal_group *tpg,
 703         struct se_lun_acl *lacl)
 704 {
 705         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 706                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 707                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 708                 tpg->se_tpg_tfo->get_fabric_name(),
 709                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 710
 711         kfree(lacl);
 712 }
 713
 714 static void scsi_dump_inquiry(struct se_device *dev)
 715 {
 716         struct t10_wwn *wwn = &dev->t10_wwn;
 717         char buf[17];
 718         int i, device_type;
 719         /*
 720          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 721          */
 722         for (i = 0; i < 8; i++)
 723                 if (wwn->vendor[i] >= 0x20)
 724                         buf[i] = wwn->vendor[i];
 725                 else
 726                         buf[i] = ' ';
 727         buf[i] = '\0';
 728         pr_debug("  Vendor: %s\n", buf);
 729
 730         for (i = 0; i < 16; i++)
 731                 if (wwn->model[i] >= 0x20)
 732                         buf[i] = wwn->model[i];
 733                 else
 734                         buf[i] = ' ';
 735         buf[i] = '\0';
 736         pr_debug("  Model: %s\n", buf);
 737
 738         for (i = 0; i < 4; i++)
 739                 if (wwn->revision[i] >= 0x20)
 740                         buf[i] = wwn->revision[i];
 741                 else
 742                         buf[i] = ' ';
 743         buf[i] = '\0';
 744         pr_debug("  Revision: %s\n", buf);
 745
 746         device_type = dev->transport->get_device_type(dev);
 747         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 748 }
 749
 750 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 751 {
 752         struct se_device *dev;
 753         struct se_lun *xcopy_lun;
 754
 755         dev = hba->backend->ops->alloc_device(hba, name);
 756         if (!dev)
 757                 return NULL;
 758
 759         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
 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_list);
 766         INIT_LIST_HEAD(&dev->dev_sep_list);
 767         INIT_LIST_HEAD(&dev->dev_tmr_list);
 768         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 769         INIT_LIST_HEAD(&dev->state_list);
 770         INIT_LIST_HEAD(&dev->qf_cmd_list);
 771         INIT_LIST_HEAD(&dev->g_dev_node);
 772         spin_lock_init(&dev->execute_task_lock);
 773         spin_lock_init(&dev->delayed_cmd_lock);
 774         spin_lock_init(&dev->dev_reservation_lock);
 775         spin_lock_init(&dev->se_port_lock);
 776         spin_lock_init(&dev->se_tmr_lock);
 777         spin_lock_init(&dev->qf_cmd_lock);
 778         sema_init(&dev->caw_sem, 1);
 779         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 780         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 781         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 782         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 783         spin_lock_init(&dev->t10_pr.registration_lock);
 784         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 785         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 786         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 787         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 788         spin_lock_init(&dev->t10_alua.lba_map_lock);
 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_LIST_HEAD(&xcopy_lun->lun_deve_list);
 824         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 825         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 826         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 827
 828         return dev;
 829 }
 830
 831 /*
 832  * Check if the underlying struct block_device request_queue supports
 833  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 834  * in ATA and we need to set TPE=1
 835  */
 836 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 837                                        struct request_queue *q, int block_size)
 838 {
 839         if (!blk_queue_discard(q))
 840                 return false;
 841
 842         attrib->max_unmap_lba_count = (q->limits.max_discard_sectors << 9) /
 843                                                                 block_size;
 844         /*
 845          * Currently hardcoded to 1 in Linux/SCSI code..
 846          */
 847         attrib->max_unmap_block_desc_count = 1;
 848         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 849         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 850                                                                 block_size;
 851         attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
 852         return true;
 853 }
 854 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 855
 856 /*
 857  * Convert from blocksize advertised to the initiator to the 512 byte
 858  * units unconditionally used by the Linux block layer.
 859  */
 860 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 861 {
 862         switch (dev->dev_attrib.block_size) {
 863         case 4096:
 864                 return lb << 3;
 865         case 2048:
 866                 return lb << 2;
 867         case 1024:
 868                 return lb << 1;
 869         default:
 870                 return lb;
 871         }
 872 }
 873 EXPORT_SYMBOL(target_to_linux_sector);
 874
 875 int target_configure_device(struct se_device *dev)
 876 {
 877         struct se_hba *hba = dev->se_hba;
 878         int ret;
 879
 880         if (dev->dev_flags & DF_CONFIGURED) {
 881                 pr_err("se_dev->se_dev_ptr already set for storage"
 882                                 " object\n");
 883                 return -EEXIST;
 884         }
 885
 886         ret = dev->transport->configure_device(dev);
 887         if (ret)
 888                 goto out;
 889         /*
 890          * XXX: there is not much point to have two different values here..
 891          */
 892         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 893         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 894
 895         /*
 896          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 897          */
 898         dev->dev_attrib.hw_max_sectors =
 899                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 900                                          dev->dev_attrib.hw_block_size);
 901         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 902
 903         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
 904         dev->creation_time = get_jiffies_64();
 905
 906         ret = core_setup_alua(dev);
 907         if (ret)
 908                 goto out;
 909
 910         /*
 911          * Startup the struct se_device processing thread
 912          */
 913         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
 914                                       dev->transport->name);
 915         if (!dev->tmr_wq) {
 916                 pr_err("Unable to create tmr workqueue for %s\n",
 917                         dev->transport->name);
 918                 ret = -ENOMEM;
 919                 goto out_free_alua;
 920         }
 921
 922         /*
 923          * Setup work_queue for QUEUE_FULL
 924          */
 925         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 926
 927         /*
 928          * Preload the initial INQUIRY const values if we are doing
 929          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
 930          * passthrough because this is being provided by the backend LLD.
 931          */
 932         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
 933                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
 934                 strncpy(&dev->t10_wwn.model[0],
 935                         dev->transport->inquiry_prod, 16);
 936                 strncpy(&dev->t10_wwn.revision[0],
 937                         dev->transport->inquiry_rev, 4);
 938         }
 939
 940         scsi_dump_inquiry(dev);
 941
 942         spin_lock(&hba->device_lock);
 943         hba->dev_count++;
 944         spin_unlock(&hba->device_lock);
 945
 946         mutex_lock(&g_device_mutex);
 947         list_add_tail(&dev->g_dev_node, &g_device_list);
 948         mutex_unlock(&g_device_mutex);
 949
 950         dev->dev_flags |= DF_CONFIGURED;
 951
 952         return 0;
 953
 954 out_free_alua:
 955         core_alua_free_lu_gp_mem(dev);
 956 out:
 957         se_release_vpd_for_dev(dev);
 958         return ret;
 959 }
 960
 961 void target_free_device(struct se_device *dev)
 962 {
 963         struct se_hba *hba = dev->se_hba;
 964
 965         WARN_ON(!list_empty(&dev->dev_sep_list));
 966
 967         if (dev->dev_flags & DF_CONFIGURED) {
 968                 destroy_workqueue(dev->tmr_wq);
 969
 970                 mutex_lock(&g_device_mutex);
 971                 list_del(&dev->g_dev_node);
 972                 mutex_unlock(&g_device_mutex);
 973
 974                 spin_lock(&hba->device_lock);
 975                 hba->dev_count--;
 976                 spin_unlock(&hba->device_lock);
 977         }
 978
 979         core_alua_free_lu_gp_mem(dev);
 980         core_alua_set_lba_map(dev, NULL, 0, 0);
 981         core_scsi3_free_all_registrations(dev);
 982         se_release_vpd_for_dev(dev);
 983
 984         if (dev->transport->free_prot)
 985                 dev->transport->free_prot(dev);
 986
 987         dev->transport->free_device(dev);
 988 }
 989
 990 int core_dev_setup_virtual_lun0(void)
 991 {
 992         struct se_hba *hba;
 993         struct se_device *dev;
 994         char buf[] = "rd_pages=8,rd_nullio=1";
 995         int ret;
 996
 997         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
 998         if (IS_ERR(hba))
 999                 return PTR_ERR(hba);
1000
1001         dev = target_alloc_device(hba, "virt_lun0");
1002         if (!dev) {
1003                 ret = -ENOMEM;
1004                 goto out_free_hba;
1005         }
1006
1007         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1008
1009         ret = target_configure_device(dev);
1010         if (ret)
1011                 goto out_free_se_dev;
1012
1013         lun0_hba = hba;
1014         g_lun0_dev = dev;
1015         return 0;
1016
1017 out_free_se_dev:
1018         target_free_device(dev);
1019 out_free_hba:
1020         core_delete_hba(hba);
1021         return ret;
1022 }
1023
1024
1025 void core_dev_release_virtual_lun0(void)
1026 {
1027         struct se_hba *hba = lun0_hba;
1028
1029         if (!hba)
1030                 return;
1031
1032         if (g_lun0_dev)
1033                 target_free_device(g_lun0_dev);
1034         core_delete_hba(hba);
1035 }
1036
1037 /*
1038  * Common CDB parsing for kernel and user passthrough.
1039  */
1040 sense_reason_t
1041 passthrough_parse_cdb(struct se_cmd *cmd,
1042         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1043 {
1044         unsigned char *cdb = cmd->t_task_cdb;
1045
1046         /*
1047          * Clear a lun set in the cdb if the initiator talking to use spoke
1048          * and old standards version, as we can't assume the underlying device
1049          * won't choke up on it.
1050          */
1051         switch (cdb[0]) {
1052         case READ_10: /* SBC - RDProtect */
1053         case READ_12: /* SBC - RDProtect */
1054         case READ_16: /* SBC - RDProtect */
1055         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1056         case VERIFY: /* SBC - VRProtect */
1057         case VERIFY_16: /* SBC - VRProtect */
1058         case WRITE_VERIFY: /* SBC - VRProtect */
1059         case WRITE_VERIFY_12: /* SBC - VRProtect */
1060         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1061                 break;
1062         default:
1063                 cdb[1] &= 0x1f; /* clear logical unit number */
1064                 break;
1065         }
1066
1067         /*
1068          * For REPORT LUNS we always need to emulate the response, for everything
1069          * else, pass it up.
1070          */
1071         if (cdb[0] == REPORT_LUNS) {
1072                 cmd->execute_cmd = spc_emulate_report_luns;
1073                 return TCM_NO_SENSE;
1074         }
1075
1076         /* Set DATA_CDB flag for ops that should have it */
1077         switch (cdb[0]) {
1078         case READ_6:
1079         case READ_10:
1080         case READ_12:
1081         case READ_16:
1082         case WRITE_6:
1083         case WRITE_10:
1084         case WRITE_12:
1085         case WRITE_16:
1086         case WRITE_VERIFY:
1087         case WRITE_VERIFY_12:
1088         case 0x8e: /* WRITE_VERIFY_16 */
1089         case COMPARE_AND_WRITE:
1090         case XDWRITEREAD_10:
1091                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1092                 break;
1093         case VARIABLE_LENGTH_CMD:
1094                 switch (get_unaligned_be16(&cdb[8])) {
1095                 case READ_32:
1096                 case WRITE_32:
1097                 case 0x0c: /* WRITE_VERIFY_32 */
1098                 case XDWRITEREAD_32:
1099                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1100                         break;
1101                 }
1102         }
1103
1104         cmd->execute_cmd = exec_cmd;
1105
1106         return TCM_NO_SENSE;
1107 }
1108 EXPORT_SYMBOL(passthrough_parse_cdb);