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