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