drivers/target/target_core_device.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   4  *
   5  * This file contains the TCM Virtual Device and Disk Transport
   6  * agnostic related functions.
   7  *
   8  * (c) Copyright 2003-2013 Datera, Inc.
   9  *
  10  * Nicholas A. Bellinger <nab@kernel.org>
  11  *
  12  ******************************************************************************/
  13
  14 #include <linux/net.h>
  15 #include <linux/string.h>
  16 #include <linux/delay.h>
  17 #include <linux/timer.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/kthread.h>
  21 #include <linux/in.h>
  22 #include <linux/export.h>
  23 #include <linux/t10-pi.h>
  24 #include <asm/unaligned.h>
  25 #include <net/sock.h>
  26 #include <net/tcp.h>
  27 #include <scsi/scsi_common.h>
  28 #include <scsi/scsi_proto.h>
  29
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_backend.h>
  32 #include <target/target_core_fabric.h>
  33
  34 #include "target_core_internal.h"
  35 #include "target_core_alua.h"
  36 #include "target_core_pr.h"
  37 #include "target_core_ua.h"
  38
  39 static DEFINE_MUTEX(device_mutex);
  40 static LIST_HEAD(device_list);
  41 static DEFINE_IDR(devices_idr);
  42
  43 static struct se_hba *lun0_hba;
  44 /* not static, needed by tpg.c */
  45 struct se_device *g_lun0_dev;
  46
  47 sense_reason_t
  48 transport_lookup_cmd_lun(struct se_cmd *se_cmd)
  49 {
  50         struct se_lun *se_lun = NULL;
  51         struct se_session *se_sess = se_cmd->se_sess;
  52         struct se_node_acl *nacl = se_sess->se_node_acl;
  53         struct se_dev_entry *deve;
  54         sense_reason_t ret = TCM_NO_SENSE;
  55
  56         rcu_read_lock();
  57         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
  58         if (deve) {
  59                 atomic_long_inc(&deve->total_cmds);
  60
  61                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  62                         atomic_long_add(se_cmd->data_length,
  63                                         &deve->write_bytes);
  64                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  65                         atomic_long_add(se_cmd->data_length,
  66                                         &deve->read_bytes);
  67
  68                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  69                     deve->lun_access_ro) {
  70                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  71                                 " Access for 0x%08llx\n",
  72                                 se_cmd->se_tfo->fabric_name,
  73                                 se_cmd->orig_fe_lun);
  74                         rcu_read_unlock();
  75                         return TCM_WRITE_PROTECTED;
  76                 }
  77
  78                 se_lun = deve->se_lun;
  79
  80                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  81                         se_lun = NULL;
  82                         goto out_unlock;
  83                 }
  84
  85                 se_cmd->se_lun = se_lun;
  86                 se_cmd->pr_res_key = deve->pr_res_key;
  87                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  88                 se_cmd->lun_ref_active = true;
  89         }
  90 out_unlock:
  91         rcu_read_unlock();
  92
  93         if (!se_lun) {
  94                 /*
  95                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  96                  * REPORT_LUNS, et al to be returned when no active
  97                  * MappedLUN=0 exists for this Initiator Port.
  98                  */
  99                 if (se_cmd->orig_fe_lun != 0) {
 100                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 101                                 " Access for 0x%08llx from %s\n",
 102                                 se_cmd->se_tfo->fabric_name,
 103                                 se_cmd->orig_fe_lun,
 104                                 nacl->initiatorname);
 105                         return TCM_NON_EXISTENT_LUN;
 106                 }
 107
 108                 /*
 109                  * Force WRITE PROTECT for virtual LUN 0
 110                  */
 111                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 112                     (se_cmd->data_direction != DMA_NONE))
 113                         return TCM_WRITE_PROTECTED;
 114
 115                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 116                 if (!percpu_ref_tryget_live(&se_lun->lun_ref))
 117                         return TCM_NON_EXISTENT_LUN;
 118
 119                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 120                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 121                 se_cmd->lun_ref_active = true;
 122         }
 123         /*
 124          * RCU reference protected by percpu se_lun->lun_ref taken above that
 125          * must drop to zero (including initial reference) before this se_lun
 126          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 127          * target_core_fabric_configfs.c:target_fabric_port_release
 128          */
 129         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 130         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 131
 132         if (se_cmd->data_direction == DMA_TO_DEVICE)
 133                 atomic_long_add(se_cmd->data_length,
 134                                 &se_cmd->se_dev->write_bytes);
 135         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 136                 atomic_long_add(se_cmd->data_length,
 137                                 &se_cmd->se_dev->read_bytes);
 138
 139         return ret;
 140 }
 141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 142
 143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
 144 {
 145         struct se_dev_entry *deve;
 146         struct se_lun *se_lun = NULL;
 147         struct se_session *se_sess = se_cmd->se_sess;
 148         struct se_node_acl *nacl = se_sess->se_node_acl;
 149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 150         unsigned long flags;
 151
 152         rcu_read_lock();
 153         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
 154         if (deve) {
 155                 se_lun = deve->se_lun;
 156
 157                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 158                         se_lun = NULL;
 159                         goto out_unlock;
 160                 }
 161
 162                 se_cmd->se_lun = se_lun;
 163                 se_cmd->pr_res_key = deve->pr_res_key;
 164                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 165                 se_cmd->lun_ref_active = true;
 166         }
 167 out_unlock:
 168         rcu_read_unlock();
 169
 170         if (!se_lun) {
 171                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 172                         " Access for 0x%08llx for %s\n",
 173                         se_cmd->se_tfo->fabric_name,
 174                         se_cmd->orig_fe_lun,
 175                         nacl->initiatorname);
 176                 return -ENODEV;
 177         }
 178         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 179         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 180
 181         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 182         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 183         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 188
 189 bool target_lun_is_rdonly(struct se_cmd *cmd)
 190 {
 191         struct se_session *se_sess = cmd->se_sess;
 192         struct se_dev_entry *deve;
 193         bool ret;
 194
 195         rcu_read_lock();
 196         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 197         ret = deve && deve->lun_access_ro;
 198         rcu_read_unlock();
 199
 200         return ret;
 201 }
 202 EXPORT_SYMBOL(target_lun_is_rdonly);
 203
 204 /*
 205  * This function is called from core_scsi3_emulate_pro_register_and_move()
 206  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 207  * when a matching rtpi is found.
 208  */
 209 struct se_dev_entry *core_get_se_deve_from_rtpi(
 210         struct se_node_acl *nacl,
 211         u16 rtpi)
 212 {
 213         struct se_dev_entry *deve;
 214         struct se_lun *lun;
 215         struct se_portal_group *tpg = nacl->se_tpg;
 216
 217         rcu_read_lock();
 218         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 219                 lun = deve->se_lun;
 220                 if (!lun) {
 221                         pr_err("%s device entries device pointer is"
 222                                 " NULL, but Initiator has access.\n",
 223                                 tpg->se_tpg_tfo->fabric_name);
 224                         continue;
 225                 }
 226                 if (lun->lun_tpg->tpg_rtpi != rtpi)
 227                         continue;
 228
 229                 kref_get(&deve->pr_kref);
 230                 rcu_read_unlock();
 231
 232                 return deve;
 233         }
 234         rcu_read_unlock();
 235
 236         return NULL;
 237 }
 238
 239 void core_free_device_list_for_node(
 240         struct se_node_acl *nacl,
 241         struct se_portal_group *tpg)
 242 {
 243         struct se_dev_entry *deve;
 244
 245         mutex_lock(&nacl->lun_entry_mutex);
 246         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 247                 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
 248         mutex_unlock(&nacl->lun_entry_mutex);
 249 }
 250
 251 void core_update_device_list_access(
 252         u64 mapped_lun,
 253         bool lun_access_ro,
 254         struct se_node_acl *nacl)
 255 {
 256         struct se_dev_entry *deve;
 257
 258         mutex_lock(&nacl->lun_entry_mutex);
 259         deve = target_nacl_find_deve(nacl, mapped_lun);
 260         if (deve)
 261                 deve->lun_access_ro = lun_access_ro;
 262         mutex_unlock(&nacl->lun_entry_mutex);
 263 }
 264
 265 /*
 266  * Called with rcu_read_lock or nacl->device_list_lock held.
 267  */
 268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 269 {
 270         struct se_dev_entry *deve;
 271
 272         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 273                 if (deve->mapped_lun == mapped_lun)
 274                         return deve;
 275
 276         return NULL;
 277 }
 278 EXPORT_SYMBOL(target_nacl_find_deve);
 279
 280 void target_pr_kref_release(struct kref *kref)
 281 {
 282         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 283                                                  pr_kref);
 284         complete(&deve->pr_comp);
 285 }
 286
 287 /*
 288  * Establish UA condition on SCSI device - all LUNs
 289  */
 290 void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
 291 {
 292         struct se_dev_entry *se_deve;
 293         struct se_lun *lun;
 294
 295         spin_lock(&dev->se_port_lock);
 296         list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
 297
 298                 spin_lock(&lun->lun_deve_lock);
 299                 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
 300                         core_scsi3_ua_allocate(se_deve, asc, ascq);
 301                 spin_unlock(&lun->lun_deve_lock);
 302         }
 303         spin_unlock(&dev->se_port_lock);
 304 }
 305
 306 static void
 307 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 308                              bool skip_new)
 309 {
 310         struct se_dev_entry *tmp;
 311
 312         rcu_read_lock();
 313         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 314                 if (skip_new && tmp == new)
 315                         continue;
 316                 core_scsi3_ua_allocate(tmp, 0x3F,
 317                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 318         }
 319         rcu_read_unlock();
 320 }
 321
 322 int core_enable_device_list_for_node(
 323         struct se_lun *lun,
 324         struct se_lun_acl *lun_acl,
 325         u64 mapped_lun,
 326         bool lun_access_ro,
 327         struct se_node_acl *nacl,
 328         struct se_portal_group *tpg)
 329 {
 330         struct se_dev_entry *orig, *new;
 331
 332         new = kzalloc(sizeof(*new), GFP_KERNEL);
 333         if (!new) {
 334                 pr_err("Unable to allocate se_dev_entry memory\n");
 335                 return -ENOMEM;
 336         }
 337
 338         spin_lock_init(&new->ua_lock);
 339         INIT_LIST_HEAD(&new->ua_list);
 340         INIT_LIST_HEAD(&new->lun_link);
 341
 342         new->mapped_lun = mapped_lun;
 343         kref_init(&new->pr_kref);
 344         init_completion(&new->pr_comp);
 345
 346         new->lun_access_ro = lun_access_ro;
 347         new->creation_time = get_jiffies_64();
 348         new->attach_count++;
 349
 350         mutex_lock(&nacl->lun_entry_mutex);
 351         orig = target_nacl_find_deve(nacl, mapped_lun);
 352         if (orig && orig->se_lun) {
 353                 struct se_lun *orig_lun = orig->se_lun;
 354
 355                 if (orig_lun != lun) {
 356                         pr_err("Existing orig->se_lun doesn't match new lun"
 357                                " for dynamic -> explicit NodeACL conversion:"
 358                                 " %s\n", nacl->initiatorname);
 359                         mutex_unlock(&nacl->lun_entry_mutex);
 360                         kfree(new);
 361                         return -EINVAL;
 362                 }
 363                 if (orig->se_lun_acl != NULL) {
 364                         pr_warn_ratelimited("Detected existing explicit"
 365                                 " se_lun_acl->se_lun_group reference for %s"
 366                                 " mapped_lun: %llu, failing\n",
 367                                  nacl->initiatorname, mapped_lun);
 368                         mutex_unlock(&nacl->lun_entry_mutex);
 369                         kfree(new);
 370                         return -EINVAL;
 371                 }
 372
 373                 new->se_lun = lun;
 374                 new->se_lun_acl = lun_acl;
 375                 hlist_del_rcu(&orig->link);
 376                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 377                 mutex_unlock(&nacl->lun_entry_mutex);
 378
 379                 spin_lock(&lun->lun_deve_lock);
 380                 list_del(&orig->lun_link);
 381                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 382                 spin_unlock(&lun->lun_deve_lock);
 383
 384                 kref_put(&orig->pr_kref, target_pr_kref_release);
 385                 wait_for_completion(&orig->pr_comp);
 386
 387                 target_luns_data_has_changed(nacl, new, true);
 388                 kfree_rcu(orig, rcu_head);
 389                 return 0;
 390         }
 391
 392         new->se_lun = lun;
 393         new->se_lun_acl = lun_acl;
 394         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 395         mutex_unlock(&nacl->lun_entry_mutex);
 396
 397         spin_lock(&lun->lun_deve_lock);
 398         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 399         spin_unlock(&lun->lun_deve_lock);
 400
 401         target_luns_data_has_changed(nacl, new, true);
 402         return 0;
 403 }
 404
 405 void core_disable_device_list_for_node(
 406         struct se_lun *lun,
 407         struct se_dev_entry *orig,
 408         struct se_node_acl *nacl,
 409         struct se_portal_group *tpg)
 410 {
 411         /*
 412          * rcu_dereference_raw protected by se_lun->lun_group symlink
 413          * reference to se_device->dev_group.
 414          */
 415         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 416
 417         lockdep_assert_held(&nacl->lun_entry_mutex);
 418
 419         /*
 420          * If the MappedLUN entry is being disabled, the entry in
 421          * lun->lun_deve_list must be removed now before clearing the
 422          * struct se_dev_entry pointers below as logic in
 423          * core_alua_do_transition_tg_pt() depends on these being present.
 424          *
 425          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 426          * that have not been explicitly converted to MappedLUNs ->
 427          * struct se_lun_acl, but we remove deve->lun_link from
 428          * lun->lun_deve_list. This also means that active UAs and
 429          * NodeACL context specific PR metadata for demo-mode
 430          * MappedLUN *deve will be released below..
 431          */
 432         spin_lock(&lun->lun_deve_lock);
 433         list_del(&orig->lun_link);
 434         spin_unlock(&lun->lun_deve_lock);
 435         /*
 436          * Disable struct se_dev_entry LUN ACL mapping
 437          */
 438         core_scsi3_ua_release_all(orig);
 439
 440         hlist_del_rcu(&orig->link);
 441         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 442         orig->lun_access_ro = false;
 443         orig->creation_time = 0;
 444         orig->attach_count--;
 445         /*
 446          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 447          * or REGISTER_AND_MOVE PR operation to complete.
 448          */
 449         kref_put(&orig->pr_kref, target_pr_kref_release);
 450         wait_for_completion(&orig->pr_comp);
 451
 452         kfree_rcu(orig, rcu_head);
 453
 454         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 455         target_luns_data_has_changed(nacl, NULL, false);
 456 }
 457
 458 /*      core_clear_lun_from_tpg():
 459  *
 460  *
 461  */
 462 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 463 {
 464         struct se_node_acl *nacl;
 465         struct se_dev_entry *deve;
 466
 467         mutex_lock(&tpg->acl_node_mutex);
 468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 469
 470                 mutex_lock(&nacl->lun_entry_mutex);
 471                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 472                         if (lun != deve->se_lun)
 473                                 continue;
 474
 475                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 476                 }
 477                 mutex_unlock(&nacl->lun_entry_mutex);
 478         }
 479         mutex_unlock(&tpg->acl_node_mutex);
 480 }
 481
 482 static void se_release_vpd_for_dev(struct se_device *dev)
 483 {
 484         struct t10_vpd *vpd, *vpd_tmp;
 485
 486         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 487         list_for_each_entry_safe(vpd, vpd_tmp,
 488                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 489                 list_del(&vpd->vpd_list);
 490                 kfree(vpd);
 491         }
 492         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 493 }
 494
 495 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 496 {
 497         u32 aligned_max_sectors;
 498         u32 alignment;
 499         /*
 500          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 501          * transport_allocate_data_tasks() operation.
 502          */
 503         alignment = max(1ul, PAGE_SIZE / block_size);
 504         aligned_max_sectors = rounddown(max_sectors, alignment);
 505
 506         if (max_sectors != aligned_max_sectors)
 507                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 508                         max_sectors, aligned_max_sectors);
 509
 510         return aligned_max_sectors;
 511 }
 512
 513 int core_dev_add_lun(
 514         struct se_portal_group *tpg,
 515         struct se_device *dev,
 516         struct se_lun *lun)
 517 {
 518         int rc;
 519
 520         rc = core_tpg_add_lun(tpg, lun, false, dev);
 521         if (rc < 0)
 522                 return rc;
 523
 524         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 525                 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
 526                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 527                 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
 528         /*
 529          * Update LUN maps for dynamically added initiators when
 530          * generate_node_acl is enabled.
 531          */
 532         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 533                 struct se_node_acl *acl;
 534
 535                 mutex_lock(&tpg->acl_node_mutex);
 536                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 537                         if (acl->dynamic_node_acl &&
 538                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 539                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 540                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 541                         }
 542                 }
 543                 mutex_unlock(&tpg->acl_node_mutex);
 544         }
 545
 546         return 0;
 547 }
 548
 549 /*      core_dev_del_lun():
 550  *
 551  *
 552  */
 553 void core_dev_del_lun(
 554         struct se_portal_group *tpg,
 555         struct se_lun *lun)
 556 {
 557         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 558                 " device object\n", tpg->se_tpg_tfo->fabric_name,
 559                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 560                 tpg->se_tpg_tfo->fabric_name);
 561
 562         core_tpg_remove_lun(tpg, lun);
 563 }
 564
 565 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 566         struct se_portal_group *tpg,
 567         struct se_node_acl *nacl,
 568         u64 mapped_lun,
 569         int *ret)
 570 {
 571         struct se_lun_acl *lacl;
 572
 573         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 574                 pr_err("%s InitiatorName exceeds maximum size.\n",
 575                         tpg->se_tpg_tfo->fabric_name);
 576                 *ret = -EOVERFLOW;
 577                 return NULL;
 578         }
 579         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 580         if (!lacl) {
 581                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 582                 *ret = -ENOMEM;
 583                 return NULL;
 584         }
 585
 586         lacl->mapped_lun = mapped_lun;
 587         lacl->se_lun_nacl = nacl;
 588
 589         return lacl;
 590 }
 591
 592 int core_dev_add_initiator_node_lun_acl(
 593         struct se_portal_group *tpg,
 594         struct se_lun_acl *lacl,
 595         struct se_lun *lun,
 596         bool lun_access_ro)
 597 {
 598         struct se_node_acl *nacl = lacl->se_lun_nacl;
 599         /*
 600          * rcu_dereference_raw protected by se_lun->lun_group symlink
 601          * reference to se_device->dev_group.
 602          */
 603         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 604
 605         if (!nacl)
 606                 return -EINVAL;
 607
 608         if (lun->lun_access_ro)
 609                 lun_access_ro = true;
 610
 611         lacl->se_lun = lun;
 612
 613         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 614                         lun_access_ro, nacl, tpg) < 0)
 615                 return -EINVAL;
 616
 617         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 618                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
 619                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 620                 lun_access_ro ? "RO" : "RW",
 621                 nacl->initiatorname);
 622         /*
 623          * Check to see if there are any existing persistent reservation APTPL
 624          * pre-registrations that need to be enabled for this LUN ACL..
 625          */
 626         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 627                                             lacl->mapped_lun);
 628         return 0;
 629 }
 630
 631 int core_dev_del_initiator_node_lun_acl(
 632         struct se_lun *lun,
 633         struct se_lun_acl *lacl)
 634 {
 635         struct se_portal_group *tpg = lun->lun_tpg;
 636         struct se_node_acl *nacl;
 637         struct se_dev_entry *deve;
 638
 639         nacl = lacl->se_lun_nacl;
 640         if (!nacl)
 641                 return -EINVAL;
 642
 643         mutex_lock(&nacl->lun_entry_mutex);
 644         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 645         if (deve)
 646                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 647         mutex_unlock(&nacl->lun_entry_mutex);
 648
 649         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 650                 " InitiatorNode: %s Mapped LUN: %llu\n",
 651                 tpg->se_tpg_tfo->fabric_name,
 652                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 653                 nacl->initiatorname, lacl->mapped_lun);
 654
 655         return 0;
 656 }
 657
 658 void core_dev_free_initiator_node_lun_acl(
 659         struct se_portal_group *tpg,
 660         struct se_lun_acl *lacl)
 661 {
 662         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 663                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
 664                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 665                 tpg->se_tpg_tfo->fabric_name,
 666                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 667
 668         kfree(lacl);
 669 }
 670
 671 static void scsi_dump_inquiry(struct se_device *dev)
 672 {
 673         struct t10_wwn *wwn = &dev->t10_wwn;
 674         int device_type = dev->transport->get_device_type(dev);
 675
 676         /*
 677          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 678          */
 679         pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
 680                 wwn->vendor);
 681         pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
 682                 wwn->model);
 683         pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
 684                 wwn->revision);
 685         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 686 }
 687
 688 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 689 {
 690         struct se_device *dev;
 691         struct se_lun *xcopy_lun;
 692         int i;
 693
 694         dev = hba->backend->ops->alloc_device(hba, name);
 695         if (!dev)
 696                 return NULL;
 697
 698         dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
 699         if (!dev->queues) {
 700                 dev->transport->free_device(dev);
 701                 return NULL;
 702         }
 703
 704         dev->queue_cnt = nr_cpu_ids;
 705         for (i = 0; i < dev->queue_cnt; i++) {
 706                 struct se_device_queue *q;
 707
 708                 q = &dev->queues[i];
 709                 INIT_LIST_HEAD(&q->state_list);
 710                 spin_lock_init(&q->lock);
 711
 712                 init_llist_head(&q->sq.cmd_list);
 713                 INIT_WORK(&q->sq.work, target_queued_submit_work);
 714         }
 715
 716         dev->se_hba = hba;
 717         dev->transport = hba->backend->ops;
 718         dev->transport_flags = dev->transport->transport_flags_default;
 719         dev->prot_length = sizeof(struct t10_pi_tuple);
 720         dev->hba_index = hba->hba_index;
 721
 722         INIT_LIST_HEAD(&dev->dev_sep_list);
 723         INIT_LIST_HEAD(&dev->dev_tmr_list);
 724         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 725         INIT_LIST_HEAD(&dev->qf_cmd_list);
 726         spin_lock_init(&dev->delayed_cmd_lock);
 727         spin_lock_init(&dev->dev_reservation_lock);
 728         spin_lock_init(&dev->se_port_lock);
 729         spin_lock_init(&dev->se_tmr_lock);
 730         spin_lock_init(&dev->qf_cmd_lock);
 731         sema_init(&dev->caw_sem, 1);
 732         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 733         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 734         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 735         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 736         spin_lock_init(&dev->t10_pr.registration_lock);
 737         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 738         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 739         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 740         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 741         spin_lock_init(&dev->t10_alua.lba_map_lock);
 742
 743         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 744         mutex_init(&dev->lun_reset_mutex);
 745
 746         dev->t10_wwn.t10_dev = dev;
 747         /*
 748          * Use OpenFabrics IEEE Company ID: 00 14 05
 749          */
 750         dev->t10_wwn.company_id = 0x001405;
 751
 752         dev->t10_alua.t10_dev = dev;
 753
 754         dev->dev_attrib.da_dev = dev;
 755         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 756         dev->dev_attrib.emulate_dpo = 1;
 757         dev->dev_attrib.emulate_fua_write = 1;
 758         dev->dev_attrib.emulate_fua_read = 1;
 759         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 760         dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
 761         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 762         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 763         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 764         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 765         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 766         dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
 767         dev->dev_attrib.emulate_rsoc = DA_EMULATE_RSOC;
 768         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 769         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 770         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 771         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 772         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 773         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 774         dev->dev_attrib.max_unmap_block_desc_count =
 775                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 776         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 777         dev->dev_attrib.unmap_granularity_alignment =
 778                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 779         dev->dev_attrib.unmap_zeroes_data =
 780                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 781         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 782
 783         xcopy_lun = &dev->xcopy_lun;
 784         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 785         init_completion(&xcopy_lun->lun_shutdown_comp);
 786         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 787         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 788         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 789         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 790
 791         /* Preload the default INQUIRY const values */
 792         strscpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
 793         strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 794                 sizeof(dev->t10_wwn.model));
 795         strscpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 796                 sizeof(dev->t10_wwn.revision));
 797
 798         return dev;
 799 }
 800
 801 /*
 802  * Check if the underlying struct block_device supports discard and if yes
 803  * configure the UNMAP parameters.
 804  */
 805 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 806                                        struct block_device *bdev)
 807 {
 808         int block_size = bdev_logical_block_size(bdev);
 809
 810         if (!bdev_max_discard_sectors(bdev))
 811                 return false;
 812
 813         attrib->max_unmap_lba_count =
 814                 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
 815         /*
 816          * Currently hardcoded to 1 in Linux/SCSI code..
 817          */
 818         attrib->max_unmap_block_desc_count = 1;
 819         attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
 820         attrib->unmap_granularity_alignment =
 821                 bdev_discard_alignment(bdev) / block_size;
 822         return true;
 823 }
 824 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 825
 826 /*
 827  * Convert from blocksize advertised to the initiator to the 512 byte
 828  * units unconditionally used by the Linux block layer.
 829  */
 830 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 831 {
 832         switch (dev->dev_attrib.block_size) {
 833         case 4096:
 834                 return lb << 3;
 835         case 2048:
 836                 return lb << 2;
 837         case 1024:
 838                 return lb << 1;
 839         default:
 840                 return lb;
 841         }
 842 }
 843 EXPORT_SYMBOL(target_to_linux_sector);
 844
 845 struct devices_idr_iter {
 846         int (*fn)(struct se_device *dev, void *data);
 847         void *data;
 848 };
 849
 850 static int target_devices_idr_iter(int id, void *p, void *data)
 851          __must_hold(&device_mutex)
 852 {
 853         struct devices_idr_iter *iter = data;
 854         struct se_device *dev = p;
 855         struct config_item *item;
 856         int ret;
 857
 858         /*
 859          * We add the device early to the idr, so it can be used
 860          * by backend modules during configuration. We do not want
 861          * to allow other callers to access partially setup devices,
 862          * so we skip them here.
 863          */
 864         if (!target_dev_configured(dev))
 865                 return 0;
 866
 867         item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 868         if (!item)
 869                 return 0;
 870         mutex_unlock(&device_mutex);
 871
 872         ret = iter->fn(dev, iter->data);
 873         config_item_put(item);
 874
 875         mutex_lock(&device_mutex);
 876         return ret;
 877 }
 878
 879 /**
 880  * target_for_each_device - iterate over configured devices
 881  * @fn: iterator function
 882  * @data: pointer to data that will be passed to fn
 883  *
 884  * fn must return 0 to continue looping over devices. non-zero will break
 885  * from the loop and return that value to the caller.
 886  */
 887 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 888                            void *data)
 889 {
 890         struct devices_idr_iter iter = { .fn = fn, .data = data };
 891         int ret;
 892
 893         mutex_lock(&device_mutex);
 894         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 895         mutex_unlock(&device_mutex);
 896         return ret;
 897 }
 898
 899 int target_configure_device(struct se_device *dev)
 900 {
 901         struct se_hba *hba = dev->se_hba;
 902         int ret, id;
 903
 904         if (target_dev_configured(dev)) {
 905                 pr_err("se_dev->se_dev_ptr already set for storage"
 906                                 " object\n");
 907                 return -EEXIST;
 908         }
 909
 910         /*
 911          * Add early so modules like tcmu can use during its
 912          * configuration.
 913          */
 914         mutex_lock(&device_mutex);
 915         /*
 916          * Use cyclic to try and avoid collisions with devices
 917          * that were recently removed.
 918          */
 919         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 920         mutex_unlock(&device_mutex);
 921         if (id < 0) {
 922                 ret = -ENOMEM;
 923                 goto out;
 924         }
 925         dev->dev_index = id;
 926
 927         ret = dev->transport->configure_device(dev);
 928         if (ret)
 929                 goto out_free_index;
 930
 931         if (dev->transport->configure_unmap &&
 932             dev->transport->configure_unmap(dev)) {
 933                 pr_debug("Discard support available, but disabled by default.\n");
 934         }
 935
 936         /*
 937          * XXX: there is not much point to have two different values here..
 938          */
 939         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 940         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 941
 942         /*
 943          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 944          */
 945         dev->dev_attrib.hw_max_sectors =
 946                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 947                                          dev->dev_attrib.hw_block_size);
 948         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 949
 950         dev->creation_time = get_jiffies_64();
 951
 952         ret = core_setup_alua(dev);
 953         if (ret)
 954                 goto out_destroy_device;
 955
 956         /*
 957          * Setup work_queue for QUEUE_FULL
 958          */
 959         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 960
 961         scsi_dump_inquiry(dev);
 962
 963         spin_lock(&hba->device_lock);
 964         hba->dev_count++;
 965         spin_unlock(&hba->device_lock);
 966
 967         dev->dev_flags |= DF_CONFIGURED;
 968
 969         return 0;
 970
 971 out_destroy_device:
 972         dev->transport->destroy_device(dev);
 973 out_free_index:
 974         mutex_lock(&device_mutex);
 975         idr_remove(&devices_idr, dev->dev_index);
 976         mutex_unlock(&device_mutex);
 977 out:
 978         se_release_vpd_for_dev(dev);
 979         return ret;
 980 }
 981
 982 void target_free_device(struct se_device *dev)
 983 {
 984         struct se_hba *hba = dev->se_hba;
 985
 986         WARN_ON(!list_empty(&dev->dev_sep_list));
 987
 988         if (target_dev_configured(dev)) {
 989                 dev->transport->destroy_device(dev);
 990
 991                 mutex_lock(&device_mutex);
 992                 idr_remove(&devices_idr, dev->dev_index);
 993                 mutex_unlock(&device_mutex);
 994
 995                 spin_lock(&hba->device_lock);
 996                 hba->dev_count--;
 997                 spin_unlock(&hba->device_lock);
 998         }
 999
1000         core_alua_free_lu_gp_mem(dev);
1001         core_alua_set_lba_map(dev, NULL, 0, 0);
1002         core_scsi3_free_all_registrations(dev);
1003         se_release_vpd_for_dev(dev);
1004
1005         if (dev->transport->free_prot)
1006                 dev->transport->free_prot(dev);
1007
1008         kfree(dev->queues);
1009         dev->transport->free_device(dev);
1010 }
1011
1012 int core_dev_setup_virtual_lun0(void)
1013 {
1014         struct se_hba *hba;
1015         struct se_device *dev;
1016         char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1017         int ret;
1018
1019         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1020         if (IS_ERR(hba))
1021                 return PTR_ERR(hba);
1022
1023         dev = target_alloc_device(hba, "virt_lun0");
1024         if (!dev) {
1025                 ret = -ENOMEM;
1026                 goto out_free_hba;
1027         }
1028
1029         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1030
1031         ret = target_configure_device(dev);
1032         if (ret)
1033                 goto out_free_se_dev;
1034
1035         lun0_hba = hba;
1036         g_lun0_dev = dev;
1037         return 0;
1038
1039 out_free_se_dev:
1040         target_free_device(dev);
1041 out_free_hba:
1042         core_delete_hba(hba);
1043         return ret;
1044 }
1045
1046
1047 void core_dev_release_virtual_lun0(void)
1048 {
1049         struct se_hba *hba = lun0_hba;
1050
1051         if (!hba)
1052                 return;
1053
1054         if (g_lun0_dev)
1055                 target_free_device(g_lun0_dev);
1056         core_delete_hba(hba);
1057 }
1058
1059 /*
1060  * Common CDB parsing for kernel and user passthrough.
1061  */
1062 sense_reason_t
1063 passthrough_parse_cdb(struct se_cmd *cmd,
1064         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1065 {
1066         unsigned char *cdb = cmd->t_task_cdb;
1067         struct se_device *dev = cmd->se_dev;
1068         unsigned int size;
1069
1070         /*
1071          * For REPORT LUNS we always need to emulate the response, for everything
1072          * else, pass it up.
1073          */
1074         if (cdb[0] == REPORT_LUNS) {
1075                 cmd->execute_cmd = spc_emulate_report_luns;
1076                 return TCM_NO_SENSE;
1077         }
1078
1079         /*
1080          * With emulate_pr disabled, all reservation requests should fail,
1081          * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1082          */
1083         if (!dev->dev_attrib.emulate_pr &&
1084             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1085              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1086              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1087              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1088                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1089         }
1090
1091         /*
1092          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1093          * emulate the response, since tcmu does not have the information
1094          * required to process these commands.
1095          */
1096         if (!(dev->transport_flags &
1097               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1098                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1099                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1100                         size = get_unaligned_be16(&cdb[7]);
1101                         return target_cmd_size_check(cmd, size);
1102                 }
1103                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1104                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1105                         size = get_unaligned_be32(&cdb[5]);
1106                         return target_cmd_size_check(cmd, size);
1107                 }
1108
1109                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1110                         cmd->execute_cmd = target_scsi2_reservation_release;
1111                         if (cdb[0] == RELEASE_10)
1112                                 size = get_unaligned_be16(&cdb[7]);
1113                         else
1114                                 size = cmd->data_length;
1115                         return target_cmd_size_check(cmd, size);
1116                 }
1117                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1118                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1119                         if (cdb[0] == RESERVE_10)
1120                                 size = get_unaligned_be16(&cdb[7]);
1121                         else
1122                                 size = cmd->data_length;
1123                         return target_cmd_size_check(cmd, size);
1124                 }
1125         }
1126
1127         /* Set DATA_CDB flag for ops that should have it */
1128         switch (cdb[0]) {
1129         case READ_6:
1130         case READ_10:
1131         case READ_12:
1132         case READ_16:
1133         case WRITE_6:
1134         case WRITE_10:
1135         case WRITE_12:
1136         case WRITE_16:
1137         case WRITE_VERIFY:
1138         case WRITE_VERIFY_12:
1139         case WRITE_VERIFY_16:
1140         case COMPARE_AND_WRITE:
1141         case XDWRITEREAD_10:
1142                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1143                 break;
1144         case VARIABLE_LENGTH_CMD:
1145                 switch (get_unaligned_be16(&cdb[8])) {
1146                 case READ_32:
1147                 case WRITE_32:
1148                 case WRITE_VERIFY_32:
1149                 case XDWRITEREAD_32:
1150                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1151                         break;
1152                 }
1153         }
1154
1155         cmd->execute_cmd = exec_cmd;
1156
1157         return TCM_NO_SENSE;
1158 }
1159 EXPORT_SYMBOL(passthrough_parse_cdb);