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
  66         rcu_read_lock();
  67         deve = target_nacl_find_deve(nacl, unpacked_lun);
  68         if (deve) {
  69                 atomic_long_inc(&deve->total_cmds);
  70
  71                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  72                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  73                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  74                                 " Access for 0x%08llx\n",
  75                                 se_cmd->se_tfo->get_fabric_name(),
  76                                 unpacked_lun);
  77                         rcu_read_unlock();
  78                         return TCM_WRITE_PROTECTED;
  79                 }
  80
  81                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  82                         atomic_long_add(se_cmd->data_length,
  83                                         &deve->write_bytes);
  84                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  85                         atomic_long_add(se_cmd->data_length,
  86                                         &deve->read_bytes);
  87
  88                 se_lun = rcu_dereference(deve->se_lun);
  89                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
  90                 se_cmd->pr_res_key = deve->pr_res_key;
  91                 se_cmd->orig_fe_lun = unpacked_lun;
  92                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  93
  94                 percpu_ref_get(&se_lun->lun_ref);
  95                 se_cmd->lun_ref_active = true;
  96         }
  97         rcu_read_unlock();
  98
  99         if (!se_lun) {
 100                 /*
 101                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 102                  * REPORT_LUNS, et al to be returned when no active
 103                  * MappedLUN=0 exists for this Initiator Port.
 104                  */
 105                 if (unpacked_lun != 0) {
 106                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 107                                 " Access for 0x%08llx\n",
 108                                 se_cmd->se_tfo->get_fabric_name(),
 109                                 unpacked_lun);
 110                         return TCM_NON_EXISTENT_LUN;
 111                 }
 112                 /*
 113                  * Force WRITE PROTECT for virtual LUN 0
 114                  */
 115                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 116                     (se_cmd->data_direction != DMA_NONE))
 117                         return TCM_WRITE_PROTECTED;
 118
 119                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 120                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 121                 se_cmd->orig_fe_lun = 0;
 122                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 123
 124                 percpu_ref_get(&se_lun->lun_ref);
 125                 se_cmd->lun_ref_active = true;
 126         }
 127         /*
 128          * RCU reference protected by percpu se_lun->lun_ref taken above that
 129          * must drop to zero (including initial reference) before this se_lun
 130          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 131          * target_core_fabric_configfs.c:target_fabric_port_release
 132          */
 133         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 134         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 135
 136         if (se_cmd->data_direction == DMA_TO_DEVICE)
 137                 atomic_long_add(se_cmd->data_length,
 138                                 &se_cmd->se_dev->write_bytes);
 139         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 140                 atomic_long_add(se_cmd->data_length,
 141                                 &se_cmd->se_dev->read_bytes);
 142
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 146
 147 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 148 {
 149         struct se_dev_entry *deve;
 150         struct se_lun *se_lun = NULL;
 151         struct se_session *se_sess = se_cmd->se_sess;
 152         struct se_node_acl *nacl = se_sess->se_node_acl;
 153         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 154         unsigned long flags;
 155
 156         rcu_read_lock();
 157         deve = target_nacl_find_deve(nacl, unpacked_lun);
 158         if (deve) {
 159                 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
 160                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
 161                 se_lun = rcu_dereference(deve->se_lun);
 162                 se_cmd->pr_res_key = deve->pr_res_key;
 163                 se_cmd->orig_fe_lun = unpacked_lun;
 164         }
 165         rcu_read_unlock();
 166
 167         if (!se_lun) {
 168                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 169                         " Access for 0x%08llx\n",
 170                         se_cmd->se_tfo->get_fabric_name(),
 171                         unpacked_lun);
 172                 return -ENODEV;
 173         }
 174         /*
 175          * XXX: Add percpu se_lun->lun_ref reference count for TMR
 176          */
 177         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 178         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 179
 180         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 181         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 182         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 183
 184         return 0;
 185 }
 186 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 187
 188 bool target_lun_is_rdonly(struct se_cmd *cmd)
 189 {
 190         struct se_session *se_sess = cmd->se_sess;
 191         struct se_dev_entry *deve;
 192         bool ret;
 193
 194         rcu_read_lock();
 195         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 196         ret = (deve && deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
 197         rcu_read_unlock();
 198
 199         return ret;
 200 }
 201 EXPORT_SYMBOL(target_lun_is_rdonly);
 202
 203 /*
 204  * This function is called from core_scsi3_emulate_pro_register_and_move()
 205  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 206  * when a matching rtpi is found.
 207  */
 208 struct se_dev_entry *core_get_se_deve_from_rtpi(
 209         struct se_node_acl *nacl,
 210         u16 rtpi)
 211 {
 212         struct se_dev_entry *deve;
 213         struct se_lun *lun;
 214         struct se_portal_group *tpg = nacl->se_tpg;
 215
 216         rcu_read_lock();
 217         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 218                 lun = rcu_dereference(deve->se_lun);
 219                 if (!lun) {
 220                         pr_err("%s device entries device pointer is"
 221                                 " NULL, but Initiator has access.\n",
 222                                 tpg->se_tpg_tfo->get_fabric_name());
 223                         continue;
 224                 }
 225                 if (lun->lun_rtpi != rtpi)
 226                         continue;
 227
 228                 kref_get(&deve->pr_kref);
 229                 rcu_read_unlock();
 230
 231                 return deve;
 232         }
 233         rcu_read_unlock();
 234
 235         return NULL;
 236 }
 237
 238 void core_free_device_list_for_node(
 239         struct se_node_acl *nacl,
 240         struct se_portal_group *tpg)
 241 {
 242         struct se_dev_entry *deve;
 243
 244         mutex_lock(&nacl->lun_entry_mutex);
 245         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 246                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 247                                         lockdep_is_held(&nacl->lun_entry_mutex));
 248                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 249         }
 250         mutex_unlock(&nacl->lun_entry_mutex);
 251 }
 252
 253 void core_update_device_list_access(
 254         u64 mapped_lun,
 255         u32 lun_access,
 256         struct se_node_acl *nacl)
 257 {
 258         struct se_dev_entry *deve;
 259
 260         mutex_lock(&nacl->lun_entry_mutex);
 261         deve = target_nacl_find_deve(nacl, mapped_lun);
 262         if (deve) {
 263                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 264                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 265                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 266                 } else {
 267                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 268                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 269                 }
 270         }
 271         mutex_unlock(&nacl->lun_entry_mutex);
 272 }
 273
 274 /*
 275  * Called with rcu_read_lock or nacl->device_list_lock held.
 276  */
 277 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 278 {
 279         struct se_dev_entry *deve;
 280
 281         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 282                 if (deve->mapped_lun == mapped_lun)
 283                         return deve;
 284
 285         return NULL;
 286 }
 287 EXPORT_SYMBOL(target_nacl_find_deve);
 288
 289 void target_pr_kref_release(struct kref *kref)
 290 {
 291         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 292                                                  pr_kref);
 293         complete(&deve->pr_comp);
 294 }
 295
 296 static void
 297 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 298                              bool skip_new)
 299 {
 300         struct se_dev_entry *tmp;
 301
 302         rcu_read_lock();
 303         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 304                 if (skip_new && tmp == new)
 305                         continue;
 306                 core_scsi3_ua_allocate(tmp, 0x3F,
 307                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 308         }
 309         rcu_read_unlock();
 310 }
 311
 312 int core_enable_device_list_for_node(
 313         struct se_lun *lun,
 314         struct se_lun_acl *lun_acl,
 315         u64 mapped_lun,
 316         u32 lun_access,
 317         struct se_node_acl *nacl,
 318         struct se_portal_group *tpg)
 319 {
 320         struct se_dev_entry *orig, *new;
 321
 322         new = kzalloc(sizeof(*new), GFP_KERNEL);
 323         if (!new) {
 324                 pr_err("Unable to allocate se_dev_entry memory\n");
 325                 return -ENOMEM;
 326         }
 327
 328         atomic_set(&new->ua_count, 0);
 329         spin_lock_init(&new->ua_lock);
 330         INIT_LIST_HEAD(&new->ua_list);
 331         INIT_LIST_HEAD(&new->lun_link);
 332
 333         new->mapped_lun = mapped_lun;
 334         kref_init(&new->pr_kref);
 335         init_completion(&new->pr_comp);
 336
 337         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
 338                 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 339         else
 340                 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341
 342         new->creation_time = get_jiffies_64();
 343         new->attach_count++;
 344
 345         mutex_lock(&nacl->lun_entry_mutex);
 346         orig = target_nacl_find_deve(nacl, mapped_lun);
 347         if (orig && orig->se_lun) {
 348                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 349                                         lockdep_is_held(&nacl->lun_entry_mutex));
 350
 351                 if (orig_lun != lun) {
 352                         pr_err("Existing orig->se_lun doesn't match new lun"
 353                                " for dynamic -> explicit NodeACL conversion:"
 354                                 " %s\n", nacl->initiatorname);
 355                         mutex_unlock(&nacl->lun_entry_mutex);
 356                         kfree(new);
 357                         return -EINVAL;
 358                 }
 359                 BUG_ON(orig->se_lun_acl != NULL);
 360
 361                 rcu_assign_pointer(new->se_lun, lun);
 362                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 363                 hlist_del_rcu(&orig->link);
 364                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 365                 mutex_unlock(&nacl->lun_entry_mutex);
 366
 367                 spin_lock(&lun->lun_deve_lock);
 368                 list_del(&orig->lun_link);
 369                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 370                 spin_unlock(&lun->lun_deve_lock);
 371
 372                 kref_put(&orig->pr_kref, target_pr_kref_release);
 373                 wait_for_completion(&orig->pr_comp);
 374
 375                 target_luns_data_has_changed(nacl, new, true);
 376                 kfree_rcu(orig, rcu_head);
 377                 return 0;
 378         }
 379
 380         rcu_assign_pointer(new->se_lun, lun);
 381         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 382         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 383         mutex_unlock(&nacl->lun_entry_mutex);
 384
 385         spin_lock(&lun->lun_deve_lock);
 386         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 387         spin_unlock(&lun->lun_deve_lock);
 388
 389         target_luns_data_has_changed(nacl, new, true);
 390         return 0;
 391 }
 392
 393 /*
 394  *      Called with se_node_acl->lun_entry_mutex held.
 395  */
 396 void core_disable_device_list_for_node(
 397         struct se_lun *lun,
 398         struct se_dev_entry *orig,
 399         struct se_node_acl *nacl,
 400         struct se_portal_group *tpg)
 401 {
 402         /*
 403          * rcu_dereference_raw protected by se_lun->lun_group symlink
 404          * reference to se_device->dev_group.
 405          */
 406         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 407         /*
 408          * If the MappedLUN entry is being disabled, the entry in
 409          * lun->lun_deve_list must be removed now before clearing the
 410          * struct se_dev_entry pointers below as logic in
 411          * core_alua_do_transition_tg_pt() depends on these being present.
 412          *
 413          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 414          * that have not been explicitly converted to MappedLUNs ->
 415          * struct se_lun_acl, but we remove deve->lun_link from
 416          * lun->lun_deve_list. This also means that active UAs and
 417          * NodeACL context specific PR metadata for demo-mode
 418          * MappedLUN *deve will be released below..
 419          */
 420         spin_lock(&lun->lun_deve_lock);
 421         list_del(&orig->lun_link);
 422         spin_unlock(&lun->lun_deve_lock);
 423         /*
 424          * Disable struct se_dev_entry LUN ACL mapping
 425          */
 426         core_scsi3_ua_release_all(orig);
 427
 428         hlist_del_rcu(&orig->link);
 429         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 430         rcu_assign_pointer(orig->se_lun, NULL);
 431         rcu_assign_pointer(orig->se_lun_acl, NULL);
 432         orig->lun_flags = 0;
 433         orig->creation_time = 0;
 434         orig->attach_count--;
 435         /*
 436          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 437          * or REGISTER_AND_MOVE PR operation to complete.
 438          */
 439         kref_put(&orig->pr_kref, target_pr_kref_release);
 440         wait_for_completion(&orig->pr_comp);
 441
 442         kfree_rcu(orig, rcu_head);
 443
 444         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 445         target_luns_data_has_changed(nacl, NULL, false);
 446 }
 447
 448 /*      core_clear_lun_from_tpg():
 449  *
 450  *
 451  */
 452 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 453 {
 454         struct se_node_acl *nacl;
 455         struct se_dev_entry *deve;
 456
 457         mutex_lock(&tpg->acl_node_mutex);
 458         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 459
 460                 mutex_lock(&nacl->lun_entry_mutex);
 461                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 462                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 463                                         lockdep_is_held(&nacl->lun_entry_mutex));
 464
 465                         if (lun != tmp_lun)
 466                                 continue;
 467
 468                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 469                 }
 470                 mutex_unlock(&nacl->lun_entry_mutex);
 471         }
 472         mutex_unlock(&tpg->acl_node_mutex);
 473 }
 474
 475 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 476 {
 477         struct se_lun *tmp;
 478
 479         spin_lock(&dev->se_port_lock);
 480         if (dev->export_count == 0x0000ffff) {
 481                 pr_warn("Reached dev->dev_port_count =="
 482                                 " 0x0000ffff\n");
 483                 spin_unlock(&dev->se_port_lock);
 484                 return -ENOSPC;
 485         }
 486 again:
 487         /*
 488          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 489          * Here is the table from spc4r17 section 7.7.3.8.
 490          *
 491          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 492          *
 493          * Code      Description
 494          * 0h        Reserved
 495          * 1h        Relative port 1, historically known as port A
 496          * 2h        Relative port 2, historically known as port B
 497          * 3h to FFFFh    Relative port 3 through 65 535
 498          */
 499         lun->lun_rtpi = dev->dev_rpti_counter++;
 500         if (!lun->lun_rtpi)
 501                 goto again;
 502
 503         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 504                 /*
 505                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 506                  * for 16-bit wrap..
 507                  */
 508                 if (lun->lun_rtpi == tmp->lun_rtpi)
 509                         goto again;
 510         }
 511         spin_unlock(&dev->se_port_lock);
 512
 513         return 0;
 514 }
 515
 516 static void se_release_vpd_for_dev(struct se_device *dev)
 517 {
 518         struct t10_vpd *vpd, *vpd_tmp;
 519
 520         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 521         list_for_each_entry_safe(vpd, vpd_tmp,
 522                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 523                 list_del(&vpd->vpd_list);
 524                 kfree(vpd);
 525         }
 526         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 527 }
 528
 529 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 530 {
 531         u32 aligned_max_sectors;
 532         u32 alignment;
 533         /*
 534          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 535          * transport_allocate_data_tasks() operation.
 536          */
 537         alignment = max(1ul, PAGE_SIZE / block_size);
 538         aligned_max_sectors = rounddown(max_sectors, alignment);
 539
 540         if (max_sectors != aligned_max_sectors)
 541                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 542                         max_sectors, aligned_max_sectors);
 543
 544         return aligned_max_sectors;
 545 }
 546
 547 int core_dev_add_lun(
 548         struct se_portal_group *tpg,
 549         struct se_device *dev,
 550         struct se_lun *lun)
 551 {
 552         int rc;
 553
 554         rc = core_tpg_add_lun(tpg, lun,
 555                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
 556         if (rc < 0)
 557                 return rc;
 558
 559         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 560                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 561                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 562                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 563         /*
 564          * Update LUN maps for dynamically added initiators when
 565          * generate_node_acl is enabled.
 566          */
 567         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 568                 struct se_node_acl *acl;
 569
 570                 mutex_lock(&tpg->acl_node_mutex);
 571                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 572                         if (acl->dynamic_node_acl &&
 573                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 574                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 575                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 576                         }
 577                 }
 578                 mutex_unlock(&tpg->acl_node_mutex);
 579         }
 580
 581         return 0;
 582 }
 583
 584 /*      core_dev_del_lun():
 585  *
 586  *
 587  */
 588 void core_dev_del_lun(
 589         struct se_portal_group *tpg,
 590         struct se_lun *lun)
 591 {
 592         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 593                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 594                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 595                 tpg->se_tpg_tfo->get_fabric_name());
 596
 597         core_tpg_remove_lun(tpg, lun);
 598 }
 599
 600 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 601         struct se_portal_group *tpg,
 602         struct se_node_acl *nacl,
 603         u64 mapped_lun,
 604         int *ret)
 605 {
 606         struct se_lun_acl *lacl;
 607
 608         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 609                 pr_err("%s InitiatorName exceeds maximum size.\n",
 610                         tpg->se_tpg_tfo->get_fabric_name());
 611                 *ret = -EOVERFLOW;
 612                 return NULL;
 613         }
 614         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 615         if (!lacl) {
 616                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 617                 *ret = -ENOMEM;
 618                 return NULL;
 619         }
 620
 621         lacl->mapped_lun = mapped_lun;
 622         lacl->se_lun_nacl = nacl;
 623
 624         return lacl;
 625 }
 626
 627 int core_dev_add_initiator_node_lun_acl(
 628         struct se_portal_group *tpg,
 629         struct se_lun_acl *lacl,
 630         struct se_lun *lun,
 631         u32 lun_access)
 632 {
 633         struct se_node_acl *nacl = lacl->se_lun_nacl;
 634         /*
 635          * rcu_dereference_raw protected by se_lun->lun_group symlink
 636          * reference to se_device->dev_group.
 637          */
 638         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 639
 640         if (!nacl)
 641                 return -EINVAL;
 642
 643         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
 644             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
 645                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 646
 647         lacl->se_lun = lun;
 648
 649         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 650                         lun_access, nacl, tpg) < 0)
 651                 return -EINVAL;
 652
 653         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 654                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 655                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 656                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
 657                 nacl->initiatorname);
 658         /*
 659          * Check to see if there are any existing persistent reservation APTPL
 660          * pre-registrations that need to be enabled for this LUN ACL..
 661          */
 662         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 663                                             lacl->mapped_lun);
 664         return 0;
 665 }
 666
 667 int core_dev_del_initiator_node_lun_acl(
 668         struct se_lun *lun,
 669         struct se_lun_acl *lacl)
 670 {
 671         struct se_portal_group *tpg = lun->lun_tpg;
 672         struct se_node_acl *nacl;
 673         struct se_dev_entry *deve;
 674
 675         nacl = lacl->se_lun_nacl;
 676         if (!nacl)
 677                 return -EINVAL;
 678
 679         mutex_lock(&nacl->lun_entry_mutex);
 680         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 681         if (deve)
 682                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 683         mutex_unlock(&nacl->lun_entry_mutex);
 684
 685         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 686                 " InitiatorNode: %s Mapped LUN: %llu\n",
 687                 tpg->se_tpg_tfo->get_fabric_name(),
 688                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 689                 nacl->initiatorname, lacl->mapped_lun);
 690
 691         return 0;
 692 }
 693
 694 void core_dev_free_initiator_node_lun_acl(
 695         struct se_portal_group *tpg,
 696         struct se_lun_acl *lacl)
 697 {
 698         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 699                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 700                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 701                 tpg->se_tpg_tfo->get_fabric_name(),
 702                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 703
 704         kfree(lacl);
 705 }
 706
 707 static void scsi_dump_inquiry(struct se_device *dev)
 708 {
 709         struct t10_wwn *wwn = &dev->t10_wwn;
 710         char buf[17];
 711         int i, device_type;
 712         /*
 713          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 714          */
 715         for (i = 0; i < 8; i++)
 716                 if (wwn->vendor[i] >= 0x20)
 717                         buf[i] = wwn->vendor[i];
 718                 else
 719                         buf[i] = ' ';
 720         buf[i] = '\0';
 721         pr_debug("  Vendor: %s\n", buf);
 722
 723         for (i = 0; i < 16; i++)
 724                 if (wwn->model[i] >= 0x20)
 725                         buf[i] = wwn->model[i];
 726                 else
 727                         buf[i] = ' ';
 728         buf[i] = '\0';
 729         pr_debug("  Model: %s\n", buf);
 730
 731         for (i = 0; i < 4; i++)
 732                 if (wwn->revision[i] >= 0x20)
 733                         buf[i] = wwn->revision[i];
 734                 else
 735                         buf[i] = ' ';
 736         buf[i] = '\0';
 737         pr_debug("  Revision: %s\n", buf);
 738
 739         device_type = dev->transport->get_device_type(dev);
 740         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 741 }
 742
 743 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 744 {
 745         struct se_device *dev;
 746         struct se_lun *xcopy_lun;
 747
 748         dev = hba->backend->ops->alloc_device(hba, name);
 749         if (!dev)
 750                 return NULL;
 751
 752         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
 753         dev->se_hba = hba;
 754         dev->transport = hba->backend->ops;
 755         dev->prot_length = sizeof(struct t10_pi_tuple);
 756         dev->hba_index = hba->hba_index;
 757
 758         INIT_LIST_HEAD(&dev->dev_list);
 759         INIT_LIST_HEAD(&dev->dev_sep_list);
 760         INIT_LIST_HEAD(&dev->dev_tmr_list);
 761         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 762         INIT_LIST_HEAD(&dev->state_list);
 763         INIT_LIST_HEAD(&dev->qf_cmd_list);
 764         INIT_LIST_HEAD(&dev->g_dev_node);
 765         spin_lock_init(&dev->execute_task_lock);
 766         spin_lock_init(&dev->delayed_cmd_lock);
 767         spin_lock_init(&dev->dev_reservation_lock);
 768         spin_lock_init(&dev->se_port_lock);
 769         spin_lock_init(&dev->se_tmr_lock);
 770         spin_lock_init(&dev->qf_cmd_lock);
 771         sema_init(&dev->caw_sem, 1);
 772         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 773         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 774         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 775         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 776         spin_lock_init(&dev->t10_pr.registration_lock);
 777         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 778         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 779         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 780         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 781         spin_lock_init(&dev->t10_alua.lba_map_lock);
 782
 783         dev->t10_wwn.t10_dev = dev;
 784         dev->t10_alua.t10_dev = dev;
 785
 786         dev->dev_attrib.da_dev = dev;
 787         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 788         dev->dev_attrib.emulate_dpo = 1;
 789         dev->dev_attrib.emulate_fua_write = 1;
 790         dev->dev_attrib.emulate_fua_read = 1;
 791         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 792         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 793         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 794         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 795         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 796         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 797         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 798         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 799         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 800         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 801         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 802         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 803         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 804         dev->dev_attrib.max_unmap_block_desc_count =
 805                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 806         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 807         dev->dev_attrib.unmap_granularity_alignment =
 808                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 809         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 810
 811         xcopy_lun = &dev->xcopy_lun;
 812         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 813         init_completion(&xcopy_lun->lun_ref_comp);
 814         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 815         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 816         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 817         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 818
 819         return dev;
 820 }
 821
 822 int target_configure_device(struct se_device *dev)
 823 {
 824         struct se_hba *hba = dev->se_hba;
 825         int ret;
 826
 827         if (dev->dev_flags & DF_CONFIGURED) {
 828                 pr_err("se_dev->se_dev_ptr already set for storage"
 829                                 " object\n");
 830                 return -EEXIST;
 831         }
 832
 833         ret = dev->transport->configure_device(dev);
 834         if (ret)
 835                 goto out;
 836         /*
 837          * XXX: there is not much point to have two different values here..
 838          */
 839         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 840         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 841
 842         /*
 843          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 844          */
 845         dev->dev_attrib.hw_max_sectors =
 846                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 847                                          dev->dev_attrib.hw_block_size);
 848         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 849
 850         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
 851         dev->creation_time = get_jiffies_64();
 852
 853         ret = core_setup_alua(dev);
 854         if (ret)
 855                 goto out;
 856
 857         /*
 858          * Startup the struct se_device processing thread
 859          */
 860         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
 861                                       dev->transport->name);
 862         if (!dev->tmr_wq) {
 863                 pr_err("Unable to create tmr workqueue for %s\n",
 864                         dev->transport->name);
 865                 ret = -ENOMEM;
 866                 goto out_free_alua;
 867         }
 868
 869         /*
 870          * Setup work_queue for QUEUE_FULL
 871          */
 872         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 873
 874         /*
 875          * Preload the initial INQUIRY const values if we are doing
 876          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
 877          * passthrough because this is being provided by the backend LLD.
 878          */
 879         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
 880                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
 881                 strncpy(&dev->t10_wwn.model[0],
 882                         dev->transport->inquiry_prod, 16);
 883                 strncpy(&dev->t10_wwn.revision[0],
 884                         dev->transport->inquiry_rev, 4);
 885         }
 886
 887         scsi_dump_inquiry(dev);
 888
 889         spin_lock(&hba->device_lock);
 890         hba->dev_count++;
 891         spin_unlock(&hba->device_lock);
 892
 893         mutex_lock(&g_device_mutex);
 894         list_add_tail(&dev->g_dev_node, &g_device_list);
 895         mutex_unlock(&g_device_mutex);
 896
 897         dev->dev_flags |= DF_CONFIGURED;
 898
 899         return 0;
 900
 901 out_free_alua:
 902         core_alua_free_lu_gp_mem(dev);
 903 out:
 904         se_release_vpd_for_dev(dev);
 905         return ret;
 906 }
 907
 908 void target_free_device(struct se_device *dev)
 909 {
 910         struct se_hba *hba = dev->se_hba;
 911
 912         WARN_ON(!list_empty(&dev->dev_sep_list));
 913
 914         if (dev->dev_flags & DF_CONFIGURED) {
 915                 destroy_workqueue(dev->tmr_wq);
 916
 917                 mutex_lock(&g_device_mutex);
 918                 list_del(&dev->g_dev_node);
 919                 mutex_unlock(&g_device_mutex);
 920
 921                 spin_lock(&hba->device_lock);
 922                 hba->dev_count--;
 923                 spin_unlock(&hba->device_lock);
 924         }
 925
 926         core_alua_free_lu_gp_mem(dev);
 927         core_alua_set_lba_map(dev, NULL, 0, 0);
 928         core_scsi3_free_all_registrations(dev);
 929         se_release_vpd_for_dev(dev);
 930
 931         if (dev->transport->free_prot)
 932                 dev->transport->free_prot(dev);
 933
 934         dev->transport->free_device(dev);
 935 }
 936
 937 int core_dev_setup_virtual_lun0(void)
 938 {
 939         struct se_hba *hba;
 940         struct se_device *dev;
 941         char buf[] = "rd_pages=8,rd_nullio=1";
 942         int ret;
 943
 944         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
 945         if (IS_ERR(hba))
 946                 return PTR_ERR(hba);
 947
 948         dev = target_alloc_device(hba, "virt_lun0");
 949         if (!dev) {
 950                 ret = -ENOMEM;
 951                 goto out_free_hba;
 952         }
 953
 954         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
 955
 956         ret = target_configure_device(dev);
 957         if (ret)
 958                 goto out_free_se_dev;
 959
 960         lun0_hba = hba;
 961         g_lun0_dev = dev;
 962         return 0;
 963
 964 out_free_se_dev:
 965         target_free_device(dev);
 966 out_free_hba:
 967         core_delete_hba(hba);
 968         return ret;
 969 }
 970
 971
 972 void core_dev_release_virtual_lun0(void)
 973 {
 974         struct se_hba *hba = lun0_hba;
 975
 976         if (!hba)
 977                 return;
 978
 979         if (g_lun0_dev)
 980                 target_free_device(g_lun0_dev);
 981         core_delete_hba(hba);
 982 }
 983
 984 /*
 985  * Common CDB parsing for kernel and user passthrough.
 986  */
 987 sense_reason_t
 988 passthrough_parse_cdb(struct se_cmd *cmd,
 989         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
 990 {
 991         unsigned char *cdb = cmd->t_task_cdb;
 992
 993         /*
 994          * Clear a lun set in the cdb if the initiator talking to use spoke
 995          * and old standards version, as we can't assume the underlying device
 996          * won't choke up on it.
 997          */
 998         switch (cdb[0]) {
 999         case READ_10: /* SBC - RDProtect */
1000         case READ_12: /* SBC - RDProtect */
1001         case READ_16: /* SBC - RDProtect */
1002         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1003         case VERIFY: /* SBC - VRProtect */
1004         case VERIFY_16: /* SBC - VRProtect */
1005         case WRITE_VERIFY: /* SBC - VRProtect */
1006         case WRITE_VERIFY_12: /* SBC - VRProtect */
1007         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1008                 break;
1009         default:
1010                 cdb[1] &= 0x1f; /* clear logical unit number */
1011                 break;
1012         }
1013
1014         /*
1015          * For REPORT LUNS we always need to emulate the response, for everything
1016          * else, pass it up.
1017          */
1018         if (cdb[0] == REPORT_LUNS) {
1019                 cmd->execute_cmd = spc_emulate_report_luns;
1020                 return TCM_NO_SENSE;
1021         }
1022
1023         /* Set DATA_CDB flag for ops that should have it */
1024         switch (cdb[0]) {
1025         case READ_6:
1026         case READ_10:
1027         case READ_12:
1028         case READ_16:
1029         case WRITE_6:
1030         case WRITE_10:
1031         case WRITE_12:
1032         case WRITE_16:
1033         case WRITE_VERIFY:
1034         case WRITE_VERIFY_12:
1035         case 0x8e: /* WRITE_VERIFY_16 */
1036         case COMPARE_AND_WRITE:
1037         case XDWRITEREAD_10:
1038                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1039                 break;
1040         case VARIABLE_LENGTH_CMD:
1041                 switch (get_unaligned_be16(&cdb[8])) {
1042                 case READ_32:
1043                 case WRITE_32:
1044                 case 0x0c: /* WRITE_VERIFY_32 */
1045                 case XDWRITEREAD_32:
1046                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1047                         break;
1048                 }
1049         }
1050
1051         cmd->execute_cmd = exec_cmd;
1052
1053         return TCM_NO_SENSE;
1054 }
1055 EXPORT_SYMBOL(passthrough_parse_cdb);