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                 se_lun = rcu_dereference(deve->se_lun);
  69
  70                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  71                         se_lun = NULL;
  72                         goto out_unlock;
  73                 }
  74
  75                 se_cmd->se_lun = se_lun;
  76                 se_cmd->pr_res_key = deve->pr_res_key;
  77                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  78                 se_cmd->lun_ref_active = true;
  79
  80                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  81                     deve->lun_access_ro) {
  82                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  83                                 " Access for 0x%08llx\n",
  84                                 se_cmd->se_tfo->fabric_name,
  85                                 se_cmd->orig_fe_lun);
  86                         rcu_read_unlock();
  87                         ret = TCM_WRITE_PROTECTED;
  88                         goto ref_dev;
  89                 }
  90         }
  91 out_unlock:
  92         rcu_read_unlock();
  93
  94         if (!se_lun) {
  95                 /*
  96                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  97                  * REPORT_LUNS, et al to be returned when no active
  98                  * MappedLUN=0 exists for this Initiator Port.
  99                  */
 100                 if (se_cmd->orig_fe_lun != 0) {
 101                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 102                                 " Access for 0x%08llx from %s\n",
 103                                 se_cmd->se_tfo->fabric_name,
 104                                 se_cmd->orig_fe_lun,
 105                                 nacl->initiatorname);
 106                         return TCM_NON_EXISTENT_LUN;
 107                 }
 108
 109                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 110                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 111                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 112
 113                 percpu_ref_get(&se_lun->lun_ref);
 114                 se_cmd->lun_ref_active = true;
 115
 116                 /*
 117                  * Force WRITE PROTECT for virtual LUN 0
 118                  */
 119                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 120                     (se_cmd->data_direction != DMA_NONE)) {
 121                         ret = TCM_WRITE_PROTECTED;
 122                         goto ref_dev;
 123                 }
 124         }
 125         /*
 126          * RCU reference protected by percpu se_lun->lun_ref taken above that
 127          * must drop to zero (including initial reference) before this se_lun
 128          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 129          * target_core_fabric_configfs.c:target_fabric_port_release
 130          */
 131 ref_dev:
 132         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 133         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 134
 135         if (se_cmd->data_direction == DMA_TO_DEVICE)
 136                 atomic_long_add(se_cmd->data_length,
 137                                 &se_cmd->se_dev->write_bytes);
 138         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 139                 atomic_long_add(se_cmd->data_length,
 140                                 &se_cmd->se_dev->read_bytes);
 141
 142         return ret;
 143 }
 144 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 145
 146 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
 147 {
 148         struct se_dev_entry *deve;
 149         struct se_lun *se_lun = NULL;
 150         struct se_session *se_sess = se_cmd->se_sess;
 151         struct se_node_acl *nacl = se_sess->se_node_acl;
 152         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 153
 154         rcu_read_lock();
 155         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
 156         if (deve) {
 157                 se_lun = rcu_dereference(deve->se_lun);
 158
 159                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 160                         se_lun = NULL;
 161                         goto out_unlock;
 162                 }
 163
 164                 se_cmd->se_lun = se_lun;
 165                 se_cmd->pr_res_key = deve->pr_res_key;
 166                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 167                 se_cmd->lun_ref_active = true;
 168         }
 169 out_unlock:
 170         rcu_read_unlock();
 171
 172         if (!se_lun) {
 173                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 174                         " Access for 0x%08llx for %s\n",
 175                         se_cmd->se_tfo->fabric_name,
 176                         se_cmd->orig_fe_lun,
 177                         nacl->initiatorname);
 178                 return -ENODEV;
 179         }
 180         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 181         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 182
 183         return 0;
 184 }
 185 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 186
 187 bool target_lun_is_rdonly(struct se_cmd *cmd)
 188 {
 189         struct se_session *se_sess = cmd->se_sess;
 190         struct se_dev_entry *deve;
 191         bool ret;
 192
 193         rcu_read_lock();
 194         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 195         ret = deve && deve->lun_access_ro;
 196         rcu_read_unlock();
 197
 198         return ret;
 199 }
 200 EXPORT_SYMBOL(target_lun_is_rdonly);
 201
 202 /*
 203  * This function is called from core_scsi3_emulate_pro_register_and_move()
 204  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 205  * when a matching rtpi is found.
 206  */
 207 struct se_dev_entry *core_get_se_deve_from_rtpi(
 208         struct se_node_acl *nacl,
 209         u16 rtpi)
 210 {
 211         struct se_dev_entry *deve;
 212         struct se_lun *lun;
 213         struct se_portal_group *tpg = nacl->se_tpg;
 214
 215         rcu_read_lock();
 216         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 217                 lun = rcu_dereference(deve->se_lun);
 218                 if (!lun) {
 219                         pr_err("%s device entries device pointer is"
 220                                 " NULL, but Initiator has access.\n",
 221                                 tpg->se_tpg_tfo->fabric_name);
 222                         continue;
 223                 }
 224                 if (lun->lun_rtpi != rtpi)
 225                         continue;
 226
 227                 kref_get(&deve->pr_kref);
 228                 rcu_read_unlock();
 229
 230                 return deve;
 231         }
 232         rcu_read_unlock();
 233
 234         return NULL;
 235 }
 236
 237 void core_free_device_list_for_node(
 238         struct se_node_acl *nacl,
 239         struct se_portal_group *tpg)
 240 {
 241         struct se_dev_entry *deve;
 242
 243         mutex_lock(&nacl->lun_entry_mutex);
 244         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 245                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 246                                         lockdep_is_held(&nacl->lun_entry_mutex));
 247                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 248         }
 249         mutex_unlock(&nacl->lun_entry_mutex);
 250 }
 251
 252 void core_update_device_list_access(
 253         u64 mapped_lun,
 254         bool lun_access_ro,
 255         struct se_node_acl *nacl)
 256 {
 257         struct se_dev_entry *deve;
 258
 259         mutex_lock(&nacl->lun_entry_mutex);
 260         deve = target_nacl_find_deve(nacl, mapped_lun);
 261         if (deve)
 262                 deve->lun_access_ro = lun_access_ro;
 263         mutex_unlock(&nacl->lun_entry_mutex);
 264 }
 265
 266 /*
 267  * Called with rcu_read_lock or nacl->device_list_lock held.
 268  */
 269 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 270 {
 271         struct se_dev_entry *deve;
 272
 273         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 274                 if (deve->mapped_lun == mapped_lun)
 275                         return deve;
 276
 277         return NULL;
 278 }
 279 EXPORT_SYMBOL(target_nacl_find_deve);
 280
 281 void target_pr_kref_release(struct kref *kref)
 282 {
 283         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 284                                                  pr_kref);
 285         complete(&deve->pr_comp);
 286 }
 287
 288 static void
 289 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 290                              bool skip_new)
 291 {
 292         struct se_dev_entry *tmp;
 293
 294         rcu_read_lock();
 295         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 296                 if (skip_new && tmp == new)
 297                         continue;
 298                 core_scsi3_ua_allocate(tmp, 0x3F,
 299                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 300         }
 301         rcu_read_unlock();
 302 }
 303
 304 int core_enable_device_list_for_node(
 305         struct se_lun *lun,
 306         struct se_lun_acl *lun_acl,
 307         u64 mapped_lun,
 308         bool lun_access_ro,
 309         struct se_node_acl *nacl,
 310         struct se_portal_group *tpg)
 311 {
 312         struct se_dev_entry *orig, *new;
 313
 314         new = kzalloc(sizeof(*new), GFP_KERNEL);
 315         if (!new) {
 316                 pr_err("Unable to allocate se_dev_entry memory\n");
 317                 return -ENOMEM;
 318         }
 319
 320         spin_lock_init(&new->ua_lock);
 321         INIT_LIST_HEAD(&new->ua_list);
 322         INIT_LIST_HEAD(&new->lun_link);
 323
 324         new->mapped_lun = mapped_lun;
 325         kref_init(&new->pr_kref);
 326         init_completion(&new->pr_comp);
 327
 328         new->lun_access_ro = lun_access_ro;
 329         new->creation_time = get_jiffies_64();
 330         new->attach_count++;
 331
 332         mutex_lock(&nacl->lun_entry_mutex);
 333         orig = target_nacl_find_deve(nacl, mapped_lun);
 334         if (orig && orig->se_lun) {
 335                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 336                                         lockdep_is_held(&nacl->lun_entry_mutex));
 337
 338                 if (orig_lun != lun) {
 339                         pr_err("Existing orig->se_lun doesn't match new lun"
 340                                " for dynamic -> explicit NodeACL conversion:"
 341                                 " %s\n", nacl->initiatorname);
 342                         mutex_unlock(&nacl->lun_entry_mutex);
 343                         kfree(new);
 344                         return -EINVAL;
 345                 }
 346                 if (orig->se_lun_acl != NULL) {
 347                         pr_warn_ratelimited("Detected existing explicit"
 348                                 " se_lun_acl->se_lun_group reference for %s"
 349                                 " mapped_lun: %llu, failing\n",
 350                                  nacl->initiatorname, mapped_lun);
 351                         mutex_unlock(&nacl->lun_entry_mutex);
 352                         kfree(new);
 353                         return -EINVAL;
 354                 }
 355
 356                 rcu_assign_pointer(new->se_lun, lun);
 357                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 358                 hlist_del_rcu(&orig->link);
 359                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 360                 mutex_unlock(&nacl->lun_entry_mutex);
 361
 362                 spin_lock(&lun->lun_deve_lock);
 363                 list_del(&orig->lun_link);
 364                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 365                 spin_unlock(&lun->lun_deve_lock);
 366
 367                 kref_put(&orig->pr_kref, target_pr_kref_release);
 368                 wait_for_completion(&orig->pr_comp);
 369
 370                 target_luns_data_has_changed(nacl, new, true);
 371                 kfree_rcu(orig, rcu_head);
 372                 return 0;
 373         }
 374
 375         rcu_assign_pointer(new->se_lun, lun);
 376         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 377         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 378         mutex_unlock(&nacl->lun_entry_mutex);
 379
 380         spin_lock(&lun->lun_deve_lock);
 381         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 382         spin_unlock(&lun->lun_deve_lock);
 383
 384         target_luns_data_has_changed(nacl, new, true);
 385         return 0;
 386 }
 387
 388 void core_disable_device_list_for_node(
 389         struct se_lun *lun,
 390         struct se_dev_entry *orig,
 391         struct se_node_acl *nacl,
 392         struct se_portal_group *tpg)
 393 {
 394         /*
 395          * rcu_dereference_raw protected by se_lun->lun_group symlink
 396          * reference to se_device->dev_group.
 397          */
 398         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 399
 400         lockdep_assert_held(&nacl->lun_entry_mutex);
 401
 402         /*
 403          * If the MappedLUN entry is being disabled, the entry in
 404          * lun->lun_deve_list must be removed now before clearing the
 405          * struct se_dev_entry pointers below as logic in
 406          * core_alua_do_transition_tg_pt() depends on these being present.
 407          *
 408          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 409          * that have not been explicitly converted to MappedLUNs ->
 410          * struct se_lun_acl, but we remove deve->lun_link from
 411          * lun->lun_deve_list. This also means that active UAs and
 412          * NodeACL context specific PR metadata for demo-mode
 413          * MappedLUN *deve will be released below..
 414          */
 415         spin_lock(&lun->lun_deve_lock);
 416         list_del(&orig->lun_link);
 417         spin_unlock(&lun->lun_deve_lock);
 418         /*
 419          * Disable struct se_dev_entry LUN ACL mapping
 420          */
 421         core_scsi3_ua_release_all(orig);
 422
 423         hlist_del_rcu(&orig->link);
 424         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 425         orig->lun_access_ro = false;
 426         orig->creation_time = 0;
 427         orig->attach_count--;
 428         /*
 429          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 430          * or REGISTER_AND_MOVE PR operation to complete.
 431          */
 432         kref_put(&orig->pr_kref, target_pr_kref_release);
 433         wait_for_completion(&orig->pr_comp);
 434
 435         rcu_assign_pointer(orig->se_lun, NULL);
 436         rcu_assign_pointer(orig->se_lun_acl, NULL);
 437
 438         kfree_rcu(orig, rcu_head);
 439
 440         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 441         target_luns_data_has_changed(nacl, NULL, false);
 442 }
 443
 444 /*      core_clear_lun_from_tpg():
 445  *
 446  *
 447  */
 448 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 449 {
 450         struct se_node_acl *nacl;
 451         struct se_dev_entry *deve;
 452
 453         mutex_lock(&tpg->acl_node_mutex);
 454         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 455
 456                 mutex_lock(&nacl->lun_entry_mutex);
 457                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 458                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 459                                         lockdep_is_held(&nacl->lun_entry_mutex));
 460
 461                         if (lun != tmp_lun)
 462                                 continue;
 463
 464                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 465                 }
 466                 mutex_unlock(&nacl->lun_entry_mutex);
 467         }
 468         mutex_unlock(&tpg->acl_node_mutex);
 469 }
 470
 471 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 472 {
 473         struct se_lun *tmp;
 474
 475         spin_lock(&dev->se_port_lock);
 476         if (dev->export_count == 0x0000ffff) {
 477                 pr_warn("Reached dev->dev_port_count =="
 478                                 " 0x0000ffff\n");
 479                 spin_unlock(&dev->se_port_lock);
 480                 return -ENOSPC;
 481         }
 482 again:
 483         /*
 484          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 485          * Here is the table from spc4r17 section 7.7.3.8.
 486          *
 487          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 488          *
 489          * Code      Description
 490          * 0h        Reserved
 491          * 1h        Relative port 1, historically known as port A
 492          * 2h        Relative port 2, historically known as port B
 493          * 3h to FFFFh    Relative port 3 through 65 535
 494          */
 495         lun->lun_rtpi = dev->dev_rpti_counter++;
 496         if (!lun->lun_rtpi)
 497                 goto again;
 498
 499         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 500                 /*
 501                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 502                  * for 16-bit wrap..
 503                  */
 504                 if (lun->lun_rtpi == tmp->lun_rtpi)
 505                         goto again;
 506         }
 507         spin_unlock(&dev->se_port_lock);
 508
 509         return 0;
 510 }
 511
 512 static void se_release_vpd_for_dev(struct se_device *dev)
 513 {
 514         struct t10_vpd *vpd, *vpd_tmp;
 515
 516         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 517         list_for_each_entry_safe(vpd, vpd_tmp,
 518                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 519                 list_del(&vpd->vpd_list);
 520                 kfree(vpd);
 521         }
 522         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 523 }
 524
 525 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 526 {
 527         u32 aligned_max_sectors;
 528         u32 alignment;
 529         /*
 530          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 531          * transport_allocate_data_tasks() operation.
 532          */
 533         alignment = max(1ul, PAGE_SIZE / block_size);
 534         aligned_max_sectors = rounddown(max_sectors, alignment);
 535
 536         if (max_sectors != aligned_max_sectors)
 537                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 538                         max_sectors, aligned_max_sectors);
 539
 540         return aligned_max_sectors;
 541 }
 542
 543 int core_dev_add_lun(
 544         struct se_portal_group *tpg,
 545         struct se_device *dev,
 546         struct se_lun *lun)
 547 {
 548         int rc;
 549
 550         rc = core_tpg_add_lun(tpg, lun, false, dev);
 551         if (rc < 0)
 552                 return rc;
 553
 554         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 555                 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
 556                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 557                 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
 558         /*
 559          * Update LUN maps for dynamically added initiators when
 560          * generate_node_acl is enabled.
 561          */
 562         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 563                 struct se_node_acl *acl;
 564
 565                 mutex_lock(&tpg->acl_node_mutex);
 566                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 567                         if (acl->dynamic_node_acl &&
 568                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 569                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 570                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 571                         }
 572                 }
 573                 mutex_unlock(&tpg->acl_node_mutex);
 574         }
 575
 576         return 0;
 577 }
 578
 579 /*      core_dev_del_lun():
 580  *
 581  *
 582  */
 583 void core_dev_del_lun(
 584         struct se_portal_group *tpg,
 585         struct se_lun *lun)
 586 {
 587         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 588                 " device object\n", tpg->se_tpg_tfo->fabric_name,
 589                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 590                 tpg->se_tpg_tfo->fabric_name);
 591
 592         core_tpg_remove_lun(tpg, lun);
 593 }
 594
 595 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 596         struct se_portal_group *tpg,
 597         struct se_node_acl *nacl,
 598         u64 mapped_lun,
 599         int *ret)
 600 {
 601         struct se_lun_acl *lacl;
 602
 603         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 604                 pr_err("%s InitiatorName exceeds maximum size.\n",
 605                         tpg->se_tpg_tfo->fabric_name);
 606                 *ret = -EOVERFLOW;
 607                 return NULL;
 608         }
 609         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 610         if (!lacl) {
 611                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 612                 *ret = -ENOMEM;
 613                 return NULL;
 614         }
 615
 616         lacl->mapped_lun = mapped_lun;
 617         lacl->se_lun_nacl = nacl;
 618
 619         return lacl;
 620 }
 621
 622 int core_dev_add_initiator_node_lun_acl(
 623         struct se_portal_group *tpg,
 624         struct se_lun_acl *lacl,
 625         struct se_lun *lun,
 626         bool lun_access_ro)
 627 {
 628         struct se_node_acl *nacl = lacl->se_lun_nacl;
 629         /*
 630          * rcu_dereference_raw protected by se_lun->lun_group symlink
 631          * reference to se_device->dev_group.
 632          */
 633         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 634
 635         if (!nacl)
 636                 return -EINVAL;
 637
 638         if (lun->lun_access_ro)
 639                 lun_access_ro = true;
 640
 641         lacl->se_lun = lun;
 642
 643         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 644                         lun_access_ro, nacl, tpg) < 0)
 645                 return -EINVAL;
 646
 647         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 648                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
 649                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 650                 lun_access_ro ? "RO" : "RW",
 651                 nacl->initiatorname);
 652         /*
 653          * Check to see if there are any existing persistent reservation APTPL
 654          * pre-registrations that need to be enabled for this LUN ACL..
 655          */
 656         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 657                                             lacl->mapped_lun);
 658         return 0;
 659 }
 660
 661 int core_dev_del_initiator_node_lun_acl(
 662         struct se_lun *lun,
 663         struct se_lun_acl *lacl)
 664 {
 665         struct se_portal_group *tpg = lun->lun_tpg;
 666         struct se_node_acl *nacl;
 667         struct se_dev_entry *deve;
 668
 669         nacl = lacl->se_lun_nacl;
 670         if (!nacl)
 671                 return -EINVAL;
 672
 673         mutex_lock(&nacl->lun_entry_mutex);
 674         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 675         if (deve)
 676                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 677         mutex_unlock(&nacl->lun_entry_mutex);
 678
 679         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 680                 " InitiatorNode: %s Mapped LUN: %llu\n",
 681                 tpg->se_tpg_tfo->fabric_name,
 682                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 683                 nacl->initiatorname, lacl->mapped_lun);
 684
 685         return 0;
 686 }
 687
 688 void core_dev_free_initiator_node_lun_acl(
 689         struct se_portal_group *tpg,
 690         struct se_lun_acl *lacl)
 691 {
 692         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 693                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
 694                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 695                 tpg->se_tpg_tfo->fabric_name,
 696                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 697
 698         kfree(lacl);
 699 }
 700
 701 static void scsi_dump_inquiry(struct se_device *dev)
 702 {
 703         struct t10_wwn *wwn = &dev->t10_wwn;
 704         int device_type = dev->transport->get_device_type(dev);
 705
 706         /*
 707          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 708          */
 709         pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
 710                 wwn->vendor);
 711         pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
 712                 wwn->model);
 713         pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
 714                 wwn->revision);
 715         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 716 }
 717
 718 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 719 {
 720         struct se_device *dev;
 721         struct se_lun *xcopy_lun;
 722         int i;
 723
 724         dev = hba->backend->ops->alloc_device(hba, name);
 725         if (!dev)
 726                 return NULL;
 727
 728         dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
 729         if (!dev->queues) {
 730                 dev->transport->free_device(dev);
 731                 return NULL;
 732         }
 733
 734         dev->queue_cnt = nr_cpu_ids;
 735         for (i = 0; i < dev->queue_cnt; i++) {
 736                 INIT_LIST_HEAD(&dev->queues[i].state_list);
 737                 spin_lock_init(&dev->queues[i].lock);
 738         }
 739
 740         dev->se_hba = hba;
 741         dev->transport = hba->backend->ops;
 742         dev->transport_flags = dev->transport->transport_flags_default;
 743         dev->prot_length = sizeof(struct t10_pi_tuple);
 744         dev->hba_index = hba->hba_index;
 745
 746         INIT_LIST_HEAD(&dev->dev_sep_list);
 747         INIT_LIST_HEAD(&dev->dev_tmr_list);
 748         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 749         INIT_LIST_HEAD(&dev->qf_cmd_list);
 750         spin_lock_init(&dev->delayed_cmd_lock);
 751         spin_lock_init(&dev->dev_reservation_lock);
 752         spin_lock_init(&dev->se_port_lock);
 753         spin_lock_init(&dev->se_tmr_lock);
 754         spin_lock_init(&dev->qf_cmd_lock);
 755         sema_init(&dev->caw_sem, 1);
 756         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 757         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 758         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 759         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 760         spin_lock_init(&dev->t10_pr.registration_lock);
 761         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 762         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 763         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 764         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 765         spin_lock_init(&dev->t10_alua.lba_map_lock);
 766
 767         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 768         mutex_init(&dev->lun_reset_mutex);
 769
 770         dev->t10_wwn.t10_dev = dev;
 771         dev->t10_alua.t10_dev = dev;
 772
 773         dev->dev_attrib.da_dev = dev;
 774         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 775         dev->dev_attrib.emulate_dpo = 1;
 776         dev->dev_attrib.emulate_fua_write = 1;
 777         dev->dev_attrib.emulate_fua_read = 1;
 778         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 779         dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
 780         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 781         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 782         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 783         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 784         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 785         dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
 786         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 787         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 788         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 789         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 790         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 791         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 792         dev->dev_attrib.max_unmap_block_desc_count =
 793                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 794         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 795         dev->dev_attrib.unmap_granularity_alignment =
 796                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 797         dev->dev_attrib.unmap_zeroes_data =
 798                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 799         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 800
 801         xcopy_lun = &dev->xcopy_lun;
 802         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 803         init_completion(&xcopy_lun->lun_shutdown_comp);
 804         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 805         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 806         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 807         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 808
 809         /* Preload the default INQUIRY const values */
 810         strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
 811         strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 812                 sizeof(dev->t10_wwn.model));
 813         strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 814                 sizeof(dev->t10_wwn.revision));
 815
 816         return dev;
 817 }
 818
 819 /*
 820  * Check if the underlying struct block_device request_queue supports
 821  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 822  * in ATA and we need to set TPE=1
 823  */
 824 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 825                                        struct request_queue *q)
 826 {
 827         int block_size = queue_logical_block_size(q);
 828
 829         if (!blk_queue_discard(q))
 830                 return false;
 831
 832         attrib->max_unmap_lba_count =
 833                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 834         /*
 835          * Currently hardcoded to 1 in Linux/SCSI code..
 836          */
 837         attrib->max_unmap_block_desc_count = 1;
 838         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 839         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 840                                                                 block_size;
 841         return true;
 842 }
 843 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 844
 845 /*
 846  * Convert from blocksize advertised to the initiator to the 512 byte
 847  * units unconditionally used by the Linux block layer.
 848  */
 849 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 850 {
 851         switch (dev->dev_attrib.block_size) {
 852         case 4096:
 853                 return lb << 3;
 854         case 2048:
 855                 return lb << 2;
 856         case 1024:
 857                 return lb << 1;
 858         default:
 859                 return lb;
 860         }
 861 }
 862 EXPORT_SYMBOL(target_to_linux_sector);
 863
 864 struct devices_idr_iter {
 865         int (*fn)(struct se_device *dev, void *data);
 866         void *data;
 867 };
 868
 869 static int target_devices_idr_iter(int id, void *p, void *data)
 870          __must_hold(&device_mutex)
 871 {
 872         struct devices_idr_iter *iter = data;
 873         struct se_device *dev = p;
 874         struct config_item *item;
 875         int ret;
 876
 877         /*
 878          * We add the device early to the idr, so it can be used
 879          * by backend modules during configuration. We do not want
 880          * to allow other callers to access partially setup devices,
 881          * so we skip them here.
 882          */
 883         if (!target_dev_configured(dev))
 884                 return 0;
 885
 886         item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 887         if (!item)
 888                 return 0;
 889         mutex_unlock(&device_mutex);
 890
 891         ret = iter->fn(dev, iter->data);
 892         config_item_put(item);
 893
 894         mutex_lock(&device_mutex);
 895         return ret;
 896 }
 897
 898 /**
 899  * target_for_each_device - iterate over configured devices
 900  * @fn: iterator function
 901  * @data: pointer to data that will be passed to fn
 902  *
 903  * fn must return 0 to continue looping over devices. non-zero will break
 904  * from the loop and return that value to the caller.
 905  */
 906 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 907                            void *data)
 908 {
 909         struct devices_idr_iter iter = { .fn = fn, .data = data };
 910         int ret;
 911
 912         mutex_lock(&device_mutex);
 913         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 914         mutex_unlock(&device_mutex);
 915         return ret;
 916 }
 917
 918 int target_configure_device(struct se_device *dev)
 919 {
 920         struct se_hba *hba = dev->se_hba;
 921         int ret, id;
 922
 923         if (target_dev_configured(dev)) {
 924                 pr_err("se_dev->se_dev_ptr already set for storage"
 925                                 " object\n");
 926                 return -EEXIST;
 927         }
 928
 929         /*
 930          * Add early so modules like tcmu can use during its
 931          * configuration.
 932          */
 933         mutex_lock(&device_mutex);
 934         /*
 935          * Use cyclic to try and avoid collisions with devices
 936          * that were recently removed.
 937          */
 938         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 939         mutex_unlock(&device_mutex);
 940         if (id < 0) {
 941                 ret = -ENOMEM;
 942                 goto out;
 943         }
 944         dev->dev_index = id;
 945
 946         ret = dev->transport->configure_device(dev);
 947         if (ret)
 948                 goto out_free_index;
 949         /*
 950          * XXX: there is not much point to have two different values here..
 951          */
 952         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 953         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 954
 955         /*
 956          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 957          */
 958         dev->dev_attrib.hw_max_sectors =
 959                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 960                                          dev->dev_attrib.hw_block_size);
 961         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 962
 963         dev->creation_time = get_jiffies_64();
 964
 965         ret = core_setup_alua(dev);
 966         if (ret)
 967                 goto out_destroy_device;
 968
 969         /*
 970          * Setup work_queue for QUEUE_FULL
 971          */
 972         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 973
 974         scsi_dump_inquiry(dev);
 975
 976         spin_lock(&hba->device_lock);
 977         hba->dev_count++;
 978         spin_unlock(&hba->device_lock);
 979
 980         dev->dev_flags |= DF_CONFIGURED;
 981
 982         return 0;
 983
 984 out_destroy_device:
 985         dev->transport->destroy_device(dev);
 986 out_free_index:
 987         mutex_lock(&device_mutex);
 988         idr_remove(&devices_idr, dev->dev_index);
 989         mutex_unlock(&device_mutex);
 990 out:
 991         se_release_vpd_for_dev(dev);
 992         return ret;
 993 }
 994
 995 void target_free_device(struct se_device *dev)
 996 {
 997         struct se_hba *hba = dev->se_hba;
 998
 999         WARN_ON(!list_empty(&dev->dev_sep_list));
1000
1001         if (target_dev_configured(dev)) {
1002                 dev->transport->destroy_device(dev);
1003
1004                 mutex_lock(&device_mutex);
1005                 idr_remove(&devices_idr, dev->dev_index);
1006                 mutex_unlock(&device_mutex);
1007
1008                 spin_lock(&hba->device_lock);
1009                 hba->dev_count--;
1010                 spin_unlock(&hba->device_lock);
1011         }
1012
1013         core_alua_free_lu_gp_mem(dev);
1014         core_alua_set_lba_map(dev, NULL, 0, 0);
1015         core_scsi3_free_all_registrations(dev);
1016         se_release_vpd_for_dev(dev);
1017
1018         if (dev->transport->free_prot)
1019                 dev->transport->free_prot(dev);
1020
1021         kfree(dev->queues);
1022         dev->transport->free_device(dev);
1023 }
1024
1025 int core_dev_setup_virtual_lun0(void)
1026 {
1027         struct se_hba *hba;
1028         struct se_device *dev;
1029         char buf[] = "rd_pages=8,rd_nullio=1";
1030         int ret;
1031
1032         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1033         if (IS_ERR(hba))
1034                 return PTR_ERR(hba);
1035
1036         dev = target_alloc_device(hba, "virt_lun0");
1037         if (!dev) {
1038                 ret = -ENOMEM;
1039                 goto out_free_hba;
1040         }
1041
1042         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1043
1044         ret = target_configure_device(dev);
1045         if (ret)
1046                 goto out_free_se_dev;
1047
1048         lun0_hba = hba;
1049         g_lun0_dev = dev;
1050         return 0;
1051
1052 out_free_se_dev:
1053         target_free_device(dev);
1054 out_free_hba:
1055         core_delete_hba(hba);
1056         return ret;
1057 }
1058
1059
1060 void core_dev_release_virtual_lun0(void)
1061 {
1062         struct se_hba *hba = lun0_hba;
1063
1064         if (!hba)
1065                 return;
1066
1067         if (g_lun0_dev)
1068                 target_free_device(g_lun0_dev);
1069         core_delete_hba(hba);
1070 }
1071
1072 /*
1073  * Common CDB parsing for kernel and user passthrough.
1074  */
1075 sense_reason_t
1076 passthrough_parse_cdb(struct se_cmd *cmd,
1077         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1078 {
1079         unsigned char *cdb = cmd->t_task_cdb;
1080         struct se_device *dev = cmd->se_dev;
1081         unsigned int size;
1082
1083         /*
1084          * For REPORT LUNS we always need to emulate the response, for everything
1085          * else, pass it up.
1086          */
1087         if (cdb[0] == REPORT_LUNS) {
1088                 cmd->execute_cmd = spc_emulate_report_luns;
1089                 return TCM_NO_SENSE;
1090         }
1091
1092         /*
1093          * With emulate_pr disabled, all reservation requests should fail,
1094          * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1095          */
1096         if (!dev->dev_attrib.emulate_pr &&
1097             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1098              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1099              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1100              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1101                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1102         }
1103
1104         /*
1105          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1106          * emulate the response, since tcmu does not have the information
1107          * required to process these commands.
1108          */
1109         if (!(dev->transport_flags &
1110               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1111                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1112                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1113                         size = get_unaligned_be16(&cdb[7]);
1114                         return target_cmd_size_check(cmd, size);
1115                 }
1116                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1117                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1118                         size = get_unaligned_be32(&cdb[5]);
1119                         return target_cmd_size_check(cmd, size);
1120                 }
1121
1122                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1123                         cmd->execute_cmd = target_scsi2_reservation_release;
1124                         if (cdb[0] == RELEASE_10)
1125                                 size = get_unaligned_be16(&cdb[7]);
1126                         else
1127                                 size = cmd->data_length;
1128                         return target_cmd_size_check(cmd, size);
1129                 }
1130                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1131                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1132                         if (cdb[0] == RESERVE_10)
1133                                 size = get_unaligned_be16(&cdb[7]);
1134                         else
1135                                 size = cmd->data_length;
1136                         return target_cmd_size_check(cmd, size);
1137                 }
1138         }
1139
1140         /* Set DATA_CDB flag for ops that should have it */
1141         switch (cdb[0]) {
1142         case READ_6:
1143         case READ_10:
1144         case READ_12:
1145         case READ_16:
1146         case WRITE_6:
1147         case WRITE_10:
1148         case WRITE_12:
1149         case WRITE_16:
1150         case WRITE_VERIFY:
1151         case WRITE_VERIFY_12:
1152         case WRITE_VERIFY_16:
1153         case COMPARE_AND_WRITE:
1154         case XDWRITEREAD_10:
1155                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1156                 break;
1157         case VARIABLE_LENGTH_CMD:
1158                 switch (get_unaligned_be16(&cdb[8])) {
1159                 case READ_32:
1160                 case WRITE_32:
1161                 case WRITE_VERIFY_32:
1162                 case XDWRITEREAD_32:
1163                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1164                         break;
1165                 }
1166         }
1167
1168         cmd->execute_cmd = exec_cmd;
1169
1170         return TCM_NO_SENSE;
1171 }
1172 EXPORT_SYMBOL(passthrough_parse_cdb);