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 DEFINE_MUTEX(g_device_mutex);
  53 LIST_HEAD(g_device_list);
  54
  55 static struct se_hba *lun0_hba;
  56 /* not static, needed by tpg.c */
  57 struct se_device *g_lun0_dev;
  58
  59 sense_reason_t
  60 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
  61 {
  62         struct se_lun *se_lun = NULL;
  63         struct se_session *se_sess = se_cmd->se_sess;
  64         struct se_node_acl *nacl = se_sess->se_node_acl;
  65         struct se_dev_entry *deve;
  66         sense_reason_t ret = TCM_NO_SENSE;
  67
  68         rcu_read_lock();
  69         deve = target_nacl_find_deve(nacl, unpacked_lun);
  70         if (deve) {
  71                 atomic_long_inc(&deve->total_cmds);
  72
  73                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  74                         atomic_long_add(se_cmd->data_length,
  75                                         &deve->write_bytes);
  76                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  77                         atomic_long_add(se_cmd->data_length,
  78                                         &deve->read_bytes);
  79
  80                 se_lun = rcu_dereference(deve->se_lun);
  81                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
  82                 se_cmd->pr_res_key = deve->pr_res_key;
  83                 se_cmd->orig_fe_lun = unpacked_lun;
  84                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  85
  86                 percpu_ref_get(&se_lun->lun_ref);
  87                 se_cmd->lun_ref_active = true;
  88
  89                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  90                     deve->lun_access_ro) {
  91                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  92                                 " Access for 0x%08llx\n",
  93                                 se_cmd->se_tfo->get_fabric_name(),
  94                                 unpacked_lun);
  95                         rcu_read_unlock();
  96                         ret = TCM_WRITE_PROTECTED;
  97                         goto ref_dev;
  98                 }
  99         }
 100         rcu_read_unlock();
 101
 102         if (!se_lun) {
 103                 /*
 104                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 105                  * REPORT_LUNS, et al to be returned when no active
 106                  * MappedLUN=0 exists for this Initiator Port.
 107                  */
 108                 if (unpacked_lun != 0) {
 109                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 110                                 " Access for 0x%08llx\n",
 111                                 se_cmd->se_tfo->get_fabric_name(),
 112                                 unpacked_lun);
 113                         return TCM_NON_EXISTENT_LUN;
 114                 }
 115
 116                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 117                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 118                 se_cmd->orig_fe_lun = 0;
 119                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 120
 121                 percpu_ref_get(&se_lun->lun_ref);
 122                 se_cmd->lun_ref_active = true;
 123
 124                 /*
 125                  * Force WRITE PROTECT for virtual LUN 0
 126                  */
 127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                     (se_cmd->data_direction != DMA_NONE)) {
 129                         ret = TCM_WRITE_PROTECTED;
 130                         goto ref_dev;
 131                 }
 132         }
 133         /*
 134          * RCU reference protected by percpu se_lun->lun_ref taken above that
 135          * must drop to zero (including initial reference) before this se_lun
 136          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 137          * target_core_fabric_configfs.c:target_fabric_port_release
 138          */
 139 ref_dev:
 140         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 141         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 142
 143         if (se_cmd->data_direction == DMA_TO_DEVICE)
 144                 atomic_long_add(se_cmd->data_length,
 145                                 &se_cmd->se_dev->write_bytes);
 146         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 147                 atomic_long_add(se_cmd->data_length,
 148                                 &se_cmd->se_dev->read_bytes);
 149
 150         return ret;
 151 }
 152 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 153
 154 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 155 {
 156         struct se_dev_entry *deve;
 157         struct se_lun *se_lun = NULL;
 158         struct se_session *se_sess = se_cmd->se_sess;
 159         struct se_node_acl *nacl = se_sess->se_node_acl;
 160         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 161         unsigned long flags;
 162
 163         rcu_read_lock();
 164         deve = target_nacl_find_deve(nacl, unpacked_lun);
 165         if (deve) {
 166                 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
 167                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
 168                 se_lun = rcu_dereference(deve->se_lun);
 169                 se_cmd->pr_res_key = deve->pr_res_key;
 170                 se_cmd->orig_fe_lun = unpacked_lun;
 171         }
 172         rcu_read_unlock();
 173
 174         if (!se_lun) {
 175                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 176                         " Access for 0x%08llx\n",
 177                         se_cmd->se_tfo->get_fabric_name(),
 178                         unpacked_lun);
 179                 return -ENODEV;
 180         }
 181         /*
 182          * XXX: Add percpu se_lun->lun_ref reference count for TMR
 183          */
 184         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 185         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 186
 187         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 188         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 189         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 190
 191         return 0;
 192 }
 193 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 194
 195 bool target_lun_is_rdonly(struct se_cmd *cmd)
 196 {
 197         struct se_session *se_sess = cmd->se_sess;
 198         struct se_dev_entry *deve;
 199         bool ret;
 200
 201         rcu_read_lock();
 202         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 203         ret = deve && deve->lun_access_ro;
 204         rcu_read_unlock();
 205
 206         return ret;
 207 }
 208 EXPORT_SYMBOL(target_lun_is_rdonly);
 209
 210 /*
 211  * This function is called from core_scsi3_emulate_pro_register_and_move()
 212  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 213  * when a matching rtpi is found.
 214  */
 215 struct se_dev_entry *core_get_se_deve_from_rtpi(
 216         struct se_node_acl *nacl,
 217         u16 rtpi)
 218 {
 219         struct se_dev_entry *deve;
 220         struct se_lun *lun;
 221         struct se_portal_group *tpg = nacl->se_tpg;
 222
 223         rcu_read_lock();
 224         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 225                 lun = rcu_dereference(deve->se_lun);
 226                 if (!lun) {
 227                         pr_err("%s device entries device pointer is"
 228                                 " NULL, but Initiator has access.\n",
 229                                 tpg->se_tpg_tfo->get_fabric_name());
 230                         continue;
 231                 }
 232                 if (lun->lun_rtpi != rtpi)
 233                         continue;
 234
 235                 kref_get(&deve->pr_kref);
 236                 rcu_read_unlock();
 237
 238                 return deve;
 239         }
 240         rcu_read_unlock();
 241
 242         return NULL;
 243 }
 244
 245 void core_free_device_list_for_node(
 246         struct se_node_acl *nacl,
 247         struct se_portal_group *tpg)
 248 {
 249         struct se_dev_entry *deve;
 250
 251         mutex_lock(&nacl->lun_entry_mutex);
 252         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 253                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 254                                         lockdep_is_held(&nacl->lun_entry_mutex));
 255                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 256         }
 257         mutex_unlock(&nacl->lun_entry_mutex);
 258 }
 259
 260 void core_update_device_list_access(
 261         u64 mapped_lun,
 262         bool lun_access_ro,
 263         struct se_node_acl *nacl)
 264 {
 265         struct se_dev_entry *deve;
 266
 267         mutex_lock(&nacl->lun_entry_mutex);
 268         deve = target_nacl_find_deve(nacl, mapped_lun);
 269         if (deve)
 270                 deve->lun_access_ro = lun_access_ro;
 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         bool lun_access_ro,
 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         new->lun_access_ro = lun_access_ro;
 338         new->creation_time = get_jiffies_64();
 339         new->attach_count++;
 340
 341         mutex_lock(&nacl->lun_entry_mutex);
 342         orig = target_nacl_find_deve(nacl, mapped_lun);
 343         if (orig && orig->se_lun) {
 344                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 345                                         lockdep_is_held(&nacl->lun_entry_mutex));
 346
 347                 if (orig_lun != lun) {
 348                         pr_err("Existing orig->se_lun doesn't match new lun"
 349                                " for dynamic -> explicit NodeACL conversion:"
 350                                 " %s\n", nacl->initiatorname);
 351                         mutex_unlock(&nacl->lun_entry_mutex);
 352                         kfree(new);
 353                         return -EINVAL;
 354                 }
 355                 if (orig->se_lun_acl != NULL) {
 356                         pr_warn_ratelimited("Detected existing explicit"
 357                                 " se_lun_acl->se_lun_group reference for %s"
 358                                 " mapped_lun: %llu, failing\n",
 359                                  nacl->initiatorname, mapped_lun);
 360                         mutex_unlock(&nacl->lun_entry_mutex);
 361                         kfree(new);
 362                         return -EINVAL;
 363                 }
 364
 365                 rcu_assign_pointer(new->se_lun, lun);
 366                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 367                 hlist_del_rcu(&orig->link);
 368                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 369                 mutex_unlock(&nacl->lun_entry_mutex);
 370
 371                 spin_lock(&lun->lun_deve_lock);
 372                 list_del(&orig->lun_link);
 373                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 374                 spin_unlock(&lun->lun_deve_lock);
 375
 376                 kref_put(&orig->pr_kref, target_pr_kref_release);
 377                 wait_for_completion(&orig->pr_comp);
 378
 379                 target_luns_data_has_changed(nacl, new, true);
 380                 kfree_rcu(orig, rcu_head);
 381                 return 0;
 382         }
 383
 384         rcu_assign_pointer(new->se_lun, lun);
 385         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 386         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 387         mutex_unlock(&nacl->lun_entry_mutex);
 388
 389         spin_lock(&lun->lun_deve_lock);
 390         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 391         spin_unlock(&lun->lun_deve_lock);
 392
 393         target_luns_data_has_changed(nacl, new, true);
 394         return 0;
 395 }
 396
 397 /*
 398  *      Called with se_node_acl->lun_entry_mutex held.
 399  */
 400 void core_disable_device_list_for_node(
 401         struct se_lun *lun,
 402         struct se_dev_entry *orig,
 403         struct se_node_acl *nacl,
 404         struct se_portal_group *tpg)
 405 {
 406         /*
 407          * rcu_dereference_raw protected by se_lun->lun_group symlink
 408          * reference to se_device->dev_group.
 409          */
 410         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 411         /*
 412          * If the MappedLUN entry is being disabled, the entry in
 413          * lun->lun_deve_list must be removed now before clearing the
 414          * struct se_dev_entry pointers below as logic in
 415          * core_alua_do_transition_tg_pt() depends on these being present.
 416          *
 417          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 418          * that have not been explicitly converted to MappedLUNs ->
 419          * struct se_lun_acl, but we remove deve->lun_link from
 420          * lun->lun_deve_list. This also means that active UAs and
 421          * NodeACL context specific PR metadata for demo-mode
 422          * MappedLUN *deve will be released below..
 423          */
 424         spin_lock(&lun->lun_deve_lock);
 425         list_del(&orig->lun_link);
 426         spin_unlock(&lun->lun_deve_lock);
 427         /*
 428          * Disable struct se_dev_entry LUN ACL mapping
 429          */
 430         core_scsi3_ua_release_all(orig);
 431
 432         hlist_del_rcu(&orig->link);
 433         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 434         orig->lun_access_ro = false;
 435         orig->creation_time = 0;
 436         orig->attach_count--;
 437         /*
 438          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 439          * or REGISTER_AND_MOVE PR operation to complete.
 440          */
 441         kref_put(&orig->pr_kref, target_pr_kref_release);
 442         wait_for_completion(&orig->pr_comp);
 443
 444         rcu_assign_pointer(orig->se_lun, NULL);
 445         rcu_assign_pointer(orig->se_lun_acl, NULL);
 446
 447         kfree_rcu(orig, rcu_head);
 448
 449         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 450         target_luns_data_has_changed(nacl, NULL, false);
 451 }
 452
 453 /*      core_clear_lun_from_tpg():
 454  *
 455  *
 456  */
 457 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 458 {
 459         struct se_node_acl *nacl;
 460         struct se_dev_entry *deve;
 461
 462         mutex_lock(&tpg->acl_node_mutex);
 463         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 464
 465                 mutex_lock(&nacl->lun_entry_mutex);
 466                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 467                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 468                                         lockdep_is_held(&nacl->lun_entry_mutex));
 469
 470                         if (lun != tmp_lun)
 471                                 continue;
 472
 473                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 474                 }
 475                 mutex_unlock(&nacl->lun_entry_mutex);
 476         }
 477         mutex_unlock(&tpg->acl_node_mutex);
 478 }
 479
 480 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 481 {
 482         struct se_lun *tmp;
 483
 484         spin_lock(&dev->se_port_lock);
 485         if (dev->export_count == 0x0000ffff) {
 486                 pr_warn("Reached dev->dev_port_count =="
 487                                 " 0x0000ffff\n");
 488                 spin_unlock(&dev->se_port_lock);
 489                 return -ENOSPC;
 490         }
 491 again:
 492         /*
 493          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 494          * Here is the table from spc4r17 section 7.7.3.8.
 495          *
 496          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 497          *
 498          * Code      Description
 499          * 0h        Reserved
 500          * 1h        Relative port 1, historically known as port A
 501          * 2h        Relative port 2, historically known as port B
 502          * 3h to FFFFh    Relative port 3 through 65 535
 503          */
 504         lun->lun_rtpi = dev->dev_rpti_counter++;
 505         if (!lun->lun_rtpi)
 506                 goto again;
 507
 508         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 509                 /*
 510                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 511                  * for 16-bit wrap..
 512                  */
 513                 if (lun->lun_rtpi == tmp->lun_rtpi)
 514                         goto again;
 515         }
 516         spin_unlock(&dev->se_port_lock);
 517
 518         return 0;
 519 }
 520
 521 static void se_release_vpd_for_dev(struct se_device *dev)
 522 {
 523         struct t10_vpd *vpd, *vpd_tmp;
 524
 525         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 526         list_for_each_entry_safe(vpd, vpd_tmp,
 527                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 528                 list_del(&vpd->vpd_list);
 529                 kfree(vpd);
 530         }
 531         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 532 }
 533
 534 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 535 {
 536         u32 aligned_max_sectors;
 537         u32 alignment;
 538         /*
 539          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 540          * transport_allocate_data_tasks() operation.
 541          */
 542         alignment = max(1ul, PAGE_SIZE / block_size);
 543         aligned_max_sectors = rounddown(max_sectors, alignment);
 544
 545         if (max_sectors != aligned_max_sectors)
 546                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 547                         max_sectors, aligned_max_sectors);
 548
 549         return aligned_max_sectors;
 550 }
 551
 552 int core_dev_add_lun(
 553         struct se_portal_group *tpg,
 554         struct se_device *dev,
 555         struct se_lun *lun)
 556 {
 557         int rc;
 558
 559         rc = core_tpg_add_lun(tpg, lun, false, dev);
 560         if (rc < 0)
 561                 return rc;
 562
 563         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 564                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 565                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 566                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 567         /*
 568          * Update LUN maps for dynamically added initiators when
 569          * generate_node_acl is enabled.
 570          */
 571         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 572                 struct se_node_acl *acl;
 573
 574                 mutex_lock(&tpg->acl_node_mutex);
 575                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 576                         if (acl->dynamic_node_acl &&
 577                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 578                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 579                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 580                         }
 581                 }
 582                 mutex_unlock(&tpg->acl_node_mutex);
 583         }
 584
 585         return 0;
 586 }
 587
 588 /*      core_dev_del_lun():
 589  *
 590  *
 591  */
 592 void core_dev_del_lun(
 593         struct se_portal_group *tpg,
 594         struct se_lun *lun)
 595 {
 596         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 597                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 598                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 599                 tpg->se_tpg_tfo->get_fabric_name());
 600
 601         core_tpg_remove_lun(tpg, lun);
 602 }
 603
 604 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 605         struct se_portal_group *tpg,
 606         struct se_node_acl *nacl,
 607         u64 mapped_lun,
 608         int *ret)
 609 {
 610         struct se_lun_acl *lacl;
 611
 612         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 613                 pr_err("%s InitiatorName exceeds maximum size.\n",
 614                         tpg->se_tpg_tfo->get_fabric_name());
 615                 *ret = -EOVERFLOW;
 616                 return NULL;
 617         }
 618         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 619         if (!lacl) {
 620                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 621                 *ret = -ENOMEM;
 622                 return NULL;
 623         }
 624
 625         lacl->mapped_lun = mapped_lun;
 626         lacl->se_lun_nacl = nacl;
 627
 628         return lacl;
 629 }
 630
 631 int core_dev_add_initiator_node_lun_acl(
 632         struct se_portal_group *tpg,
 633         struct se_lun_acl *lacl,
 634         struct se_lun *lun,
 635         bool lun_access_ro)
 636 {
 637         struct se_node_acl *nacl = lacl->se_lun_nacl;
 638         /*
 639          * rcu_dereference_raw protected by se_lun->lun_group symlink
 640          * reference to se_device->dev_group.
 641          */
 642         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 643
 644         if (!nacl)
 645                 return -EINVAL;
 646
 647         if (lun->lun_access_ro)
 648                 lun_access_ro = true;
 649
 650         lacl->se_lun = lun;
 651
 652         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 653                         lun_access_ro, nacl, tpg) < 0)
 654                 return -EINVAL;
 655
 656         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 657                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 658                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 659                 lun_access_ro ? "RO" : "RW",
 660                 nacl->initiatorname);
 661         /*
 662          * Check to see if there are any existing persistent reservation APTPL
 663          * pre-registrations that need to be enabled for this LUN ACL..
 664          */
 665         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 666                                             lacl->mapped_lun);
 667         return 0;
 668 }
 669
 670 int core_dev_del_initiator_node_lun_acl(
 671         struct se_lun *lun,
 672         struct se_lun_acl *lacl)
 673 {
 674         struct se_portal_group *tpg = lun->lun_tpg;
 675         struct se_node_acl *nacl;
 676         struct se_dev_entry *deve;
 677
 678         nacl = lacl->se_lun_nacl;
 679         if (!nacl)
 680                 return -EINVAL;
 681
 682         mutex_lock(&nacl->lun_entry_mutex);
 683         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 684         if (deve)
 685                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 686         mutex_unlock(&nacl->lun_entry_mutex);
 687
 688         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 689                 " InitiatorNode: %s Mapped LUN: %llu\n",
 690                 tpg->se_tpg_tfo->get_fabric_name(),
 691                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 692                 nacl->initiatorname, lacl->mapped_lun);
 693
 694         return 0;
 695 }
 696
 697 void core_dev_free_initiator_node_lun_acl(
 698         struct se_portal_group *tpg,
 699         struct se_lun_acl *lacl)
 700 {
 701         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 702                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 703                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 704                 tpg->se_tpg_tfo->get_fabric_name(),
 705                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 706
 707         kfree(lacl);
 708 }
 709
 710 static void scsi_dump_inquiry(struct se_device *dev)
 711 {
 712         struct t10_wwn *wwn = &dev->t10_wwn;
 713         char buf[17];
 714         int i, device_type;
 715         /*
 716          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 717          */
 718         for (i = 0; i < 8; i++)
 719                 if (wwn->vendor[i] >= 0x20)
 720                         buf[i] = wwn->vendor[i];
 721                 else
 722                         buf[i] = ' ';
 723         buf[i] = '\0';
 724         pr_debug("  Vendor: %s\n", buf);
 725
 726         for (i = 0; i < 16; i++)
 727                 if (wwn->model[i] >= 0x20)
 728                         buf[i] = wwn->model[i];
 729                 else
 730                         buf[i] = ' ';
 731         buf[i] = '\0';
 732         pr_debug("  Model: %s\n", buf);
 733
 734         for (i = 0; i < 4; i++)
 735                 if (wwn->revision[i] >= 0x20)
 736                         buf[i] = wwn->revision[i];
 737                 else
 738                         buf[i] = ' ';
 739         buf[i] = '\0';
 740         pr_debug("  Revision: %s\n", buf);
 741
 742         device_type = dev->transport->get_device_type(dev);
 743         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 744 }
 745
 746 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 747 {
 748         struct se_device *dev;
 749         struct se_lun *xcopy_lun;
 750
 751         dev = hba->backend->ops->alloc_device(hba, name);
 752         if (!dev)
 753                 return NULL;
 754
 755         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
 756         dev->se_hba = hba;
 757         dev->transport = hba->backend->ops;
 758         dev->prot_length = sizeof(struct t10_pi_tuple);
 759         dev->hba_index = hba->hba_index;
 760
 761         INIT_LIST_HEAD(&dev->dev_list);
 762         INIT_LIST_HEAD(&dev->dev_sep_list);
 763         INIT_LIST_HEAD(&dev->dev_tmr_list);
 764         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 765         INIT_LIST_HEAD(&dev->state_list);
 766         INIT_LIST_HEAD(&dev->qf_cmd_list);
 767         INIT_LIST_HEAD(&dev->g_dev_node);
 768         spin_lock_init(&dev->execute_task_lock);
 769         spin_lock_init(&dev->delayed_cmd_lock);
 770         spin_lock_init(&dev->dev_reservation_lock);
 771         spin_lock_init(&dev->se_port_lock);
 772         spin_lock_init(&dev->se_tmr_lock);
 773         spin_lock_init(&dev->qf_cmd_lock);
 774         sema_init(&dev->caw_sem, 1);
 775         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 776         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 777         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 778         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 779         spin_lock_init(&dev->t10_pr.registration_lock);
 780         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 781         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 782         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 783         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 784         spin_lock_init(&dev->t10_alua.lba_map_lock);
 785
 786         dev->t10_wwn.t10_dev = dev;
 787         dev->t10_alua.t10_dev = dev;
 788
 789         dev->dev_attrib.da_dev = dev;
 790         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 791         dev->dev_attrib.emulate_dpo = 1;
 792         dev->dev_attrib.emulate_fua_write = 1;
 793         dev->dev_attrib.emulate_fua_read = 1;
 794         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 795         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 796         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 797         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 798         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 799         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 800         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 801         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 802         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 803         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 804         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 805         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 806         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 807         dev->dev_attrib.max_unmap_block_desc_count =
 808                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 809         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 810         dev->dev_attrib.unmap_granularity_alignment =
 811                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 812         dev->dev_attrib.unmap_zeroes_data =
 813                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 814         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 815
 816         xcopy_lun = &dev->xcopy_lun;
 817         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 818         init_completion(&xcopy_lun->lun_ref_comp);
 819         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 820         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 821         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 822         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 823
 824         return dev;
 825 }
 826
 827 /*
 828  * Check if the underlying struct block_device request_queue supports
 829  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 830  * in ATA and we need to set TPE=1
 831  */
 832 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 833                                        struct request_queue *q)
 834 {
 835         int block_size = queue_logical_block_size(q);
 836
 837         if (!blk_queue_discard(q))
 838                 return false;
 839
 840         attrib->max_unmap_lba_count =
 841                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 842         /*
 843          * Currently hardcoded to 1 in Linux/SCSI code..
 844          */
 845         attrib->max_unmap_block_desc_count = 1;
 846         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 847         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 848                                                                 block_size;
 849         attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
 850         return true;
 851 }
 852 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 853
 854 /*
 855  * Convert from blocksize advertised to the initiator to the 512 byte
 856  * units unconditionally used by the Linux block layer.
 857  */
 858 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 859 {
 860         switch (dev->dev_attrib.block_size) {
 861         case 4096:
 862                 return lb << 3;
 863         case 2048:
 864                 return lb << 2;
 865         case 1024:
 866                 return lb << 1;
 867         default:
 868                 return lb;
 869         }
 870 }
 871 EXPORT_SYMBOL(target_to_linux_sector);
 872
 873 int target_configure_device(struct se_device *dev)
 874 {
 875         struct se_hba *hba = dev->se_hba;
 876         int ret;
 877
 878         if (dev->dev_flags & DF_CONFIGURED) {
 879                 pr_err("se_dev->se_dev_ptr already set for storage"
 880                                 " object\n");
 881                 return -EEXIST;
 882         }
 883
 884         ret = dev->transport->configure_device(dev);
 885         if (ret)
 886                 goto out;
 887         /*
 888          * XXX: there is not much point to have two different values here..
 889          */
 890         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 891         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 892
 893         /*
 894          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 895          */
 896         dev->dev_attrib.hw_max_sectors =
 897                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 898                                          dev->dev_attrib.hw_block_size);
 899         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 900
 901         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
 902         dev->creation_time = get_jiffies_64();
 903
 904         ret = core_setup_alua(dev);
 905         if (ret)
 906                 goto out;
 907
 908         /*
 909          * Startup the struct se_device processing thread
 910          */
 911         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
 912                                       dev->transport->name);
 913         if (!dev->tmr_wq) {
 914                 pr_err("Unable to create tmr workqueue for %s\n",
 915                         dev->transport->name);
 916                 ret = -ENOMEM;
 917                 goto out_free_alua;
 918         }
 919
 920         /*
 921          * Setup work_queue for QUEUE_FULL
 922          */
 923         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 924
 925         /*
 926          * Preload the initial INQUIRY const values if we are doing
 927          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
 928          * passthrough because this is being provided by the backend LLD.
 929          */
 930         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
 931                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
 932                 strncpy(&dev->t10_wwn.model[0],
 933                         dev->transport->inquiry_prod, 16);
 934                 strncpy(&dev->t10_wwn.revision[0],
 935                         dev->transport->inquiry_rev, 4);
 936         }
 937
 938         scsi_dump_inquiry(dev);
 939
 940         spin_lock(&hba->device_lock);
 941         hba->dev_count++;
 942         spin_unlock(&hba->device_lock);
 943
 944         mutex_lock(&g_device_mutex);
 945         list_add_tail(&dev->g_dev_node, &g_device_list);
 946         mutex_unlock(&g_device_mutex);
 947
 948         dev->dev_flags |= DF_CONFIGURED;
 949
 950         return 0;
 951
 952 out_free_alua:
 953         core_alua_free_lu_gp_mem(dev);
 954 out:
 955         se_release_vpd_for_dev(dev);
 956         return ret;
 957 }
 958
 959 void target_free_device(struct se_device *dev)
 960 {
 961         struct se_hba *hba = dev->se_hba;
 962
 963         WARN_ON(!list_empty(&dev->dev_sep_list));
 964
 965         if (dev->dev_flags & DF_CONFIGURED) {
 966                 destroy_workqueue(dev->tmr_wq);
 967
 968                 mutex_lock(&g_device_mutex);
 969                 list_del(&dev->g_dev_node);
 970                 mutex_unlock(&g_device_mutex);
 971
 972                 spin_lock(&hba->device_lock);
 973                 hba->dev_count--;
 974                 spin_unlock(&hba->device_lock);
 975         }
 976
 977         core_alua_free_lu_gp_mem(dev);
 978         core_alua_set_lba_map(dev, NULL, 0, 0);
 979         core_scsi3_free_all_registrations(dev);
 980         se_release_vpd_for_dev(dev);
 981
 982         if (dev->transport->free_prot)
 983                 dev->transport->free_prot(dev);
 984
 985         dev->transport->free_device(dev);
 986 }
 987
 988 int core_dev_setup_virtual_lun0(void)
 989 {
 990         struct se_hba *hba;
 991         struct se_device *dev;
 992         char buf[] = "rd_pages=8,rd_nullio=1";
 993         int ret;
 994
 995         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
 996         if (IS_ERR(hba))
 997                 return PTR_ERR(hba);
 998
 999         dev = target_alloc_device(hba, "virt_lun0");
1000         if (!dev) {
1001                 ret = -ENOMEM;
1002                 goto out_free_hba;
1003         }
1004
1005         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1006
1007         ret = target_configure_device(dev);
1008         if (ret)
1009                 goto out_free_se_dev;
1010
1011         lun0_hba = hba;
1012         g_lun0_dev = dev;
1013         return 0;
1014
1015 out_free_se_dev:
1016         target_free_device(dev);
1017 out_free_hba:
1018         core_delete_hba(hba);
1019         return ret;
1020 }
1021
1022
1023 void core_dev_release_virtual_lun0(void)
1024 {
1025         struct se_hba *hba = lun0_hba;
1026
1027         if (!hba)
1028                 return;
1029
1030         if (g_lun0_dev)
1031                 target_free_device(g_lun0_dev);
1032         core_delete_hba(hba);
1033 }
1034
1035 /*
1036  * Common CDB parsing for kernel and user passthrough.
1037  */
1038 sense_reason_t
1039 passthrough_parse_cdb(struct se_cmd *cmd,
1040         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1041 {
1042         unsigned char *cdb = cmd->t_task_cdb;
1043
1044         /*
1045          * Clear a lun set in the cdb if the initiator talking to use spoke
1046          * and old standards version, as we can't assume the underlying device
1047          * won't choke up on it.
1048          */
1049         switch (cdb[0]) {
1050         case READ_10: /* SBC - RDProtect */
1051         case READ_12: /* SBC - RDProtect */
1052         case READ_16: /* SBC - RDProtect */
1053         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1054         case VERIFY: /* SBC - VRProtect */
1055         case VERIFY_16: /* SBC - VRProtect */
1056         case WRITE_VERIFY: /* SBC - VRProtect */
1057         case WRITE_VERIFY_12: /* SBC - VRProtect */
1058         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1059                 break;
1060         default:
1061                 cdb[1] &= 0x1f; /* clear logical unit number */
1062                 break;
1063         }
1064
1065         /*
1066          * For REPORT LUNS we always need to emulate the response, for everything
1067          * else, pass it up.
1068          */
1069         if (cdb[0] == REPORT_LUNS) {
1070                 cmd->execute_cmd = spc_emulate_report_luns;
1071                 return TCM_NO_SENSE;
1072         }
1073
1074         /* Set DATA_CDB flag for ops that should have it */
1075         switch (cdb[0]) {
1076         case READ_6:
1077         case READ_10:
1078         case READ_12:
1079         case READ_16:
1080         case WRITE_6:
1081         case WRITE_10:
1082         case WRITE_12:
1083         case WRITE_16:
1084         case WRITE_VERIFY:
1085         case WRITE_VERIFY_12:
1086         case 0x8e: /* WRITE_VERIFY_16 */
1087         case COMPARE_AND_WRITE:
1088         case XDWRITEREAD_10:
1089                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1090                 break;
1091         case VARIABLE_LENGTH_CMD:
1092                 switch (get_unaligned_be16(&cdb[8])) {
1093                 case READ_32:
1094                 case WRITE_32:
1095                 case 0x0c: /* WRITE_VERIFY_32 */
1096                 case XDWRITEREAD_32:
1097                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1098                         break;
1099                 }
1100         }
1101
1102         cmd->execute_cmd = exec_cmd;
1103
1104         return TCM_NO_SENSE;
1105 }
1106 EXPORT_SYMBOL(passthrough_parse_cdb);