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