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 <asm/unaligned.h>
  25 #include <net/sock.h>
  26 #include <net/tcp.h>
  27 #include <scsi/scsi_common.h>
  28 #include <scsi/scsi_proto.h>
  29
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_backend.h>
  32 #include <target/target_core_fabric.h>
  33
  34 #include "target_core_internal.h"
  35 #include "target_core_alua.h"
  36 #include "target_core_pr.h"
  37 #include "target_core_ua.h"
  38
  39 static DEFINE_MUTEX(device_mutex);
  40 static LIST_HEAD(device_list);
  41 static DEFINE_IDR(devices_idr);
  42
  43 static struct se_hba *lun0_hba;
  44 /* not static, needed by tpg.c */
  45 struct se_device *g_lun0_dev;
  46
  47 sense_reason_t
  48 transport_lookup_cmd_lun(struct se_cmd *se_cmd)
  49 {
  50         struct se_lun *se_lun = NULL;
  51         struct se_session *se_sess = se_cmd->se_sess;
  52         struct se_node_acl *nacl = se_sess->se_node_acl;
  53         struct se_dev_entry *deve;
  54         sense_reason_t ret = TCM_NO_SENSE;
  55
  56         rcu_read_lock();
  57         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
  58         if (deve) {
  59                 atomic_long_inc(&deve->total_cmds);
  60
  61                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  62                         atomic_long_add(se_cmd->data_length,
  63                                         &deve->write_bytes);
  64                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  65                         atomic_long_add(se_cmd->data_length,
  66                                         &deve->read_bytes);
  67
  68                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  69                     deve->lun_access_ro) {
  70                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  71                                 " Access for 0x%08llx\n",
  72                                 se_cmd->se_tfo->fabric_name,
  73                                 se_cmd->orig_fe_lun);
  74                         rcu_read_unlock();
  75                         return TCM_WRITE_PROTECTED;
  76                 }
  77
  78                 se_lun = deve->se_lun;
  79
  80                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  81                         se_lun = NULL;
  82                         goto out_unlock;
  83                 }
  84
  85                 se_cmd->se_lun = se_lun;
  86                 se_cmd->pr_res_key = deve->pr_res_key;
  87                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  88                 se_cmd->lun_ref_active = true;
  89         }
  90 out_unlock:
  91         rcu_read_unlock();
  92
  93         if (!se_lun) {
  94                 /*
  95                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  96                  * REPORT_LUNS, et al to be returned when no active
  97                  * MappedLUN=0 exists for this Initiator Port.
  98                  */
  99                 if (se_cmd->orig_fe_lun != 0) {
 100                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 101                                 " Access for 0x%08llx from %s\n",
 102                                 se_cmd->se_tfo->fabric_name,
 103                                 se_cmd->orig_fe_lun,
 104                                 nacl->initiatorname);
 105                         return TCM_NON_EXISTENT_LUN;
 106                 }
 107
 108                 /*
 109                  * Force WRITE PROTECT for virtual LUN 0
 110                  */
 111                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 112                     (se_cmd->data_direction != DMA_NONE))
 113                         return TCM_WRITE_PROTECTED;
 114
 115                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 116                 if (!percpu_ref_tryget_live(&se_lun->lun_ref))
 117                         return TCM_NON_EXISTENT_LUN;
 118
 119                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 120                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 121                 se_cmd->lun_ref_active = true;
 122         }
 123         /*
 124          * RCU reference protected by percpu se_lun->lun_ref taken above that
 125          * must drop to zero (including initial reference) before this se_lun
 126          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 127          * target_core_fabric_configfs.c:target_fabric_port_release
 128          */
 129         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 130         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 131
 132         if (se_cmd->data_direction == DMA_TO_DEVICE)
 133                 atomic_long_add(se_cmd->data_length,
 134                                 &se_cmd->se_dev->write_bytes);
 135         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 136                 atomic_long_add(se_cmd->data_length,
 137                                 &se_cmd->se_dev->read_bytes);
 138
 139         return ret;
 140 }
 141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 142
 143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
 144 {
 145         struct se_dev_entry *deve;
 146         struct se_lun *se_lun = NULL;
 147         struct se_session *se_sess = se_cmd->se_sess;
 148         struct se_node_acl *nacl = se_sess->se_node_acl;
 149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 150         unsigned long flags;
 151
 152         rcu_read_lock();
 153         deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
 154         if (deve) {
 155                 se_lun = deve->se_lun;
 156
 157                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
 158                         se_lun = NULL;
 159                         goto out_unlock;
 160                 }
 161
 162                 se_cmd->se_lun = se_lun;
 163                 se_cmd->pr_res_key = deve->pr_res_key;
 164                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 165                 se_cmd->lun_ref_active = true;
 166         }
 167 out_unlock:
 168         rcu_read_unlock();
 169
 170         if (!se_lun) {
 171                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 172                         " Access for 0x%08llx for %s\n",
 173                         se_cmd->se_tfo->fabric_name,
 174                         se_cmd->orig_fe_lun,
 175                         nacl->initiatorname);
 176                 return -ENODEV;
 177         }
 178         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 179         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 180
 181         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 182         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 183         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 188
 189 bool target_lun_is_rdonly(struct se_cmd *cmd)
 190 {
 191         struct se_session *se_sess = cmd->se_sess;
 192         struct se_dev_entry *deve;
 193         bool ret;
 194
 195         rcu_read_lock();
 196         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 197         ret = deve && deve->lun_access_ro;
 198         rcu_read_unlock();
 199
 200         return ret;
 201 }
 202 EXPORT_SYMBOL(target_lun_is_rdonly);
 203
 204 /*
 205  * This function is called from core_scsi3_emulate_pro_register_and_move()
 206  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 207  * when a matching rtpi is found.
 208  */
 209 struct se_dev_entry *core_get_se_deve_from_rtpi(
 210         struct se_node_acl *nacl,
 211         u16 rtpi)
 212 {
 213         struct se_dev_entry *deve;
 214         struct se_lun *lun;
 215         struct se_portal_group *tpg = nacl->se_tpg;
 216
 217         rcu_read_lock();
 218         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 219                 lun = deve->se_lun;
 220                 if (!lun) {
 221                         pr_err("%s device entries device pointer is"
 222                                 " NULL, but Initiator has access.\n",
 223                                 tpg->se_tpg_tfo->fabric_name);
 224                         continue;
 225                 }
 226                 if (lun->lun_rtpi != rtpi)
 227                         continue;
 228
 229                 kref_get(&deve->pr_kref);
 230                 rcu_read_unlock();
 231
 232                 return deve;
 233         }
 234         rcu_read_unlock();
 235
 236         return NULL;
 237 }
 238
 239 void core_free_device_list_for_node(
 240         struct se_node_acl *nacl,
 241         struct se_portal_group *tpg)
 242 {
 243         struct se_dev_entry *deve;
 244
 245         mutex_lock(&nacl->lun_entry_mutex);
 246         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 247                 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
 248         mutex_unlock(&nacl->lun_entry_mutex);
 249 }
 250
 251 void core_update_device_list_access(
 252         u64 mapped_lun,
 253         bool lun_access_ro,
 254         struct se_node_acl *nacl)
 255 {
 256         struct se_dev_entry *deve;
 257
 258         mutex_lock(&nacl->lun_entry_mutex);
 259         deve = target_nacl_find_deve(nacl, mapped_lun);
 260         if (deve)
 261                 deve->lun_access_ro = lun_access_ro;
 262         mutex_unlock(&nacl->lun_entry_mutex);
 263 }
 264
 265 /*
 266  * Called with rcu_read_lock or nacl->device_list_lock held.
 267  */
 268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 269 {
 270         struct se_dev_entry *deve;
 271
 272         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 273                 if (deve->mapped_lun == mapped_lun)
 274                         return deve;
 275
 276         return NULL;
 277 }
 278 EXPORT_SYMBOL(target_nacl_find_deve);
 279
 280 void target_pr_kref_release(struct kref *kref)
 281 {
 282         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 283                                                  pr_kref);
 284         complete(&deve->pr_comp);
 285 }
 286
 287 static void
 288 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 289                              bool skip_new)
 290 {
 291         struct se_dev_entry *tmp;
 292
 293         rcu_read_lock();
 294         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 295                 if (skip_new && tmp == new)
 296                         continue;
 297                 core_scsi3_ua_allocate(tmp, 0x3F,
 298                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 299         }
 300         rcu_read_unlock();
 301 }
 302
 303 int core_enable_device_list_for_node(
 304         struct se_lun *lun,
 305         struct se_lun_acl *lun_acl,
 306         u64 mapped_lun,
 307         bool lun_access_ro,
 308         struct se_node_acl *nacl,
 309         struct se_portal_group *tpg)
 310 {
 311         struct se_dev_entry *orig, *new;
 312
 313         new = kzalloc(sizeof(*new), GFP_KERNEL);
 314         if (!new) {
 315                 pr_err("Unable to allocate se_dev_entry memory\n");
 316                 return -ENOMEM;
 317         }
 318
 319         spin_lock_init(&new->ua_lock);
 320         INIT_LIST_HEAD(&new->ua_list);
 321         INIT_LIST_HEAD(&new->lun_link);
 322
 323         new->mapped_lun = mapped_lun;
 324         kref_init(&new->pr_kref);
 325         init_completion(&new->pr_comp);
 326
 327         new->lun_access_ro = lun_access_ro;
 328         new->creation_time = get_jiffies_64();
 329         new->attach_count++;
 330
 331         mutex_lock(&nacl->lun_entry_mutex);
 332         orig = target_nacl_find_deve(nacl, mapped_lun);
 333         if (orig && orig->se_lun) {
 334                 struct se_lun *orig_lun = orig->se_lun;
 335
 336                 if (orig_lun != lun) {
 337                         pr_err("Existing orig->se_lun doesn't match new lun"
 338                                " for dynamic -> explicit NodeACL conversion:"
 339                                 " %s\n", nacl->initiatorname);
 340                         mutex_unlock(&nacl->lun_entry_mutex);
 341                         kfree(new);
 342                         return -EINVAL;
 343                 }
 344                 if (orig->se_lun_acl != NULL) {
 345                         pr_warn_ratelimited("Detected existing explicit"
 346                                 " se_lun_acl->se_lun_group reference for %s"
 347                                 " mapped_lun: %llu, failing\n",
 348                                  nacl->initiatorname, mapped_lun);
 349                         mutex_unlock(&nacl->lun_entry_mutex);
 350                         kfree(new);
 351                         return -EINVAL;
 352                 }
 353
 354                 new->se_lun = lun;
 355                 new->se_lun_acl = lun_acl;
 356                 hlist_del_rcu(&orig->link);
 357                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 358                 mutex_unlock(&nacl->lun_entry_mutex);
 359
 360                 spin_lock(&lun->lun_deve_lock);
 361                 list_del(&orig->lun_link);
 362                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 363                 spin_unlock(&lun->lun_deve_lock);
 364
 365                 kref_put(&orig->pr_kref, target_pr_kref_release);
 366                 wait_for_completion(&orig->pr_comp);
 367
 368                 target_luns_data_has_changed(nacl, new, true);
 369                 kfree_rcu(orig, rcu_head);
 370                 return 0;
 371         }
 372
 373         new->se_lun = lun;
 374         new->se_lun_acl = lun_acl;
 375         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 376         mutex_unlock(&nacl->lun_entry_mutex);
 377
 378         spin_lock(&lun->lun_deve_lock);
 379         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 380         spin_unlock(&lun->lun_deve_lock);
 381
 382         target_luns_data_has_changed(nacl, new, true);
 383         return 0;
 384 }
 385
 386 void core_disable_device_list_for_node(
 387         struct se_lun *lun,
 388         struct se_dev_entry *orig,
 389         struct se_node_acl *nacl,
 390         struct se_portal_group *tpg)
 391 {
 392         /*
 393          * rcu_dereference_raw protected by se_lun->lun_group symlink
 394          * reference to se_device->dev_group.
 395          */
 396         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 397
 398         lockdep_assert_held(&nacl->lun_entry_mutex);
 399
 400         /*
 401          * If the MappedLUN entry is being disabled, the entry in
 402          * lun->lun_deve_list must be removed now before clearing the
 403          * struct se_dev_entry pointers below as logic in
 404          * core_alua_do_transition_tg_pt() depends on these being present.
 405          *
 406          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 407          * that have not been explicitly converted to MappedLUNs ->
 408          * struct se_lun_acl, but we remove deve->lun_link from
 409          * lun->lun_deve_list. This also means that active UAs and
 410          * NodeACL context specific PR metadata for demo-mode
 411          * MappedLUN *deve will be released below..
 412          */
 413         spin_lock(&lun->lun_deve_lock);
 414         list_del(&orig->lun_link);
 415         spin_unlock(&lun->lun_deve_lock);
 416         /*
 417          * Disable struct se_dev_entry LUN ACL mapping
 418          */
 419         core_scsi3_ua_release_all(orig);
 420
 421         hlist_del_rcu(&orig->link);
 422         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 423         orig->lun_access_ro = false;
 424         orig->creation_time = 0;
 425         orig->attach_count--;
 426         /*
 427          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 428          * or REGISTER_AND_MOVE PR operation to complete.
 429          */
 430         kref_put(&orig->pr_kref, target_pr_kref_release);
 431         wait_for_completion(&orig->pr_comp);
 432
 433         kfree_rcu(orig, rcu_head);
 434
 435         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 436         target_luns_data_has_changed(nacl, NULL, false);
 437 }
 438
 439 /*      core_clear_lun_from_tpg():
 440  *
 441  *
 442  */
 443 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 444 {
 445         struct se_node_acl *nacl;
 446         struct se_dev_entry *deve;
 447
 448         mutex_lock(&tpg->acl_node_mutex);
 449         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 450
 451                 mutex_lock(&nacl->lun_entry_mutex);
 452                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 453                         if (lun != deve->se_lun)
 454                                 continue;
 455
 456                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 457                 }
 458                 mutex_unlock(&nacl->lun_entry_mutex);
 459         }
 460         mutex_unlock(&tpg->acl_node_mutex);
 461 }
 462
 463 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 464 {
 465         struct se_lun *tmp;
 466
 467         spin_lock(&dev->se_port_lock);
 468         if (dev->export_count == 0x0000ffff) {
 469                 pr_warn("Reached dev->dev_port_count =="
 470                                 " 0x0000ffff\n");
 471                 spin_unlock(&dev->se_port_lock);
 472                 return -ENOSPC;
 473         }
 474 again:
 475         /*
 476          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 477          * Here is the table from spc4r17 section 7.7.3.8.
 478          *
 479          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 480          *
 481          * Code      Description
 482          * 0h        Reserved
 483          * 1h        Relative port 1, historically known as port A
 484          * 2h        Relative port 2, historically known as port B
 485          * 3h to FFFFh    Relative port 3 through 65 535
 486          */
 487         lun->lun_rtpi = dev->dev_rpti_counter++;
 488         if (!lun->lun_rtpi)
 489                 goto again;
 490
 491         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 492                 /*
 493                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 494                  * for 16-bit wrap..
 495                  */
 496                 if (lun->lun_rtpi == tmp->lun_rtpi)
 497                         goto again;
 498         }
 499         spin_unlock(&dev->se_port_lock);
 500
 501         return 0;
 502 }
 503
 504 static void se_release_vpd_for_dev(struct se_device *dev)
 505 {
 506         struct t10_vpd *vpd, *vpd_tmp;
 507
 508         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 509         list_for_each_entry_safe(vpd, vpd_tmp,
 510                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 511                 list_del(&vpd->vpd_list);
 512                 kfree(vpd);
 513         }
 514         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 515 }
 516
 517 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 518 {
 519         u32 aligned_max_sectors;
 520         u32 alignment;
 521         /*
 522          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 523          * transport_allocate_data_tasks() operation.
 524          */
 525         alignment = max(1ul, PAGE_SIZE / block_size);
 526         aligned_max_sectors = rounddown(max_sectors, alignment);
 527
 528         if (max_sectors != aligned_max_sectors)
 529                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 530                         max_sectors, aligned_max_sectors);
 531
 532         return aligned_max_sectors;
 533 }
 534
 535 int core_dev_add_lun(
 536         struct se_portal_group *tpg,
 537         struct se_device *dev,
 538         struct se_lun *lun)
 539 {
 540         int rc;
 541
 542         rc = core_tpg_add_lun(tpg, lun, false, dev);
 543         if (rc < 0)
 544                 return rc;
 545
 546         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 547                 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
 548                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 549                 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
 550         /*
 551          * Update LUN maps for dynamically added initiators when
 552          * generate_node_acl is enabled.
 553          */
 554         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 555                 struct se_node_acl *acl;
 556
 557                 mutex_lock(&tpg->acl_node_mutex);
 558                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 559                         if (acl->dynamic_node_acl &&
 560                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 561                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 562                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 563                         }
 564                 }
 565                 mutex_unlock(&tpg->acl_node_mutex);
 566         }
 567
 568         return 0;
 569 }
 570
 571 /*      core_dev_del_lun():
 572  *
 573  *
 574  */
 575 void core_dev_del_lun(
 576         struct se_portal_group *tpg,
 577         struct se_lun *lun)
 578 {
 579         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 580                 " device object\n", tpg->se_tpg_tfo->fabric_name,
 581                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 582                 tpg->se_tpg_tfo->fabric_name);
 583
 584         core_tpg_remove_lun(tpg, lun);
 585 }
 586
 587 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 588         struct se_portal_group *tpg,
 589         struct se_node_acl *nacl,
 590         u64 mapped_lun,
 591         int *ret)
 592 {
 593         struct se_lun_acl *lacl;
 594
 595         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 596                 pr_err("%s InitiatorName exceeds maximum size.\n",
 597                         tpg->se_tpg_tfo->fabric_name);
 598                 *ret = -EOVERFLOW;
 599                 return NULL;
 600         }
 601         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 602         if (!lacl) {
 603                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 604                 *ret = -ENOMEM;
 605                 return NULL;
 606         }
 607
 608         lacl->mapped_lun = mapped_lun;
 609         lacl->se_lun_nacl = nacl;
 610
 611         return lacl;
 612 }
 613
 614 int core_dev_add_initiator_node_lun_acl(
 615         struct se_portal_group *tpg,
 616         struct se_lun_acl *lacl,
 617         struct se_lun *lun,
 618         bool lun_access_ro)
 619 {
 620         struct se_node_acl *nacl = lacl->se_lun_nacl;
 621         /*
 622          * rcu_dereference_raw protected by se_lun->lun_group symlink
 623          * reference to se_device->dev_group.
 624          */
 625         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 626
 627         if (!nacl)
 628                 return -EINVAL;
 629
 630         if (lun->lun_access_ro)
 631                 lun_access_ro = true;
 632
 633         lacl->se_lun = lun;
 634
 635         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 636                         lun_access_ro, nacl, tpg) < 0)
 637                 return -EINVAL;
 638
 639         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 640                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
 641                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 642                 lun_access_ro ? "RO" : "RW",
 643                 nacl->initiatorname);
 644         /*
 645          * Check to see if there are any existing persistent reservation APTPL
 646          * pre-registrations that need to be enabled for this LUN ACL..
 647          */
 648         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 649                                             lacl->mapped_lun);
 650         return 0;
 651 }
 652
 653 int core_dev_del_initiator_node_lun_acl(
 654         struct se_lun *lun,
 655         struct se_lun_acl *lacl)
 656 {
 657         struct se_portal_group *tpg = lun->lun_tpg;
 658         struct se_node_acl *nacl;
 659         struct se_dev_entry *deve;
 660
 661         nacl = lacl->se_lun_nacl;
 662         if (!nacl)
 663                 return -EINVAL;
 664
 665         mutex_lock(&nacl->lun_entry_mutex);
 666         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 667         if (deve)
 668                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 669         mutex_unlock(&nacl->lun_entry_mutex);
 670
 671         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 672                 " InitiatorNode: %s Mapped LUN: %llu\n",
 673                 tpg->se_tpg_tfo->fabric_name,
 674                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 675                 nacl->initiatorname, lacl->mapped_lun);
 676
 677         return 0;
 678 }
 679
 680 void core_dev_free_initiator_node_lun_acl(
 681         struct se_portal_group *tpg,
 682         struct se_lun_acl *lacl)
 683 {
 684         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 685                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
 686                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 687                 tpg->se_tpg_tfo->fabric_name,
 688                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 689
 690         kfree(lacl);
 691 }
 692
 693 static void scsi_dump_inquiry(struct se_device *dev)
 694 {
 695         struct t10_wwn *wwn = &dev->t10_wwn;
 696         int device_type = dev->transport->get_device_type(dev);
 697
 698         /*
 699          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 700          */
 701         pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
 702                 wwn->vendor);
 703         pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
 704                 wwn->model);
 705         pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
 706                 wwn->revision);
 707         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 708 }
 709
 710 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 711 {
 712         struct se_device *dev;
 713         struct se_lun *xcopy_lun;
 714         int i;
 715
 716         dev = hba->backend->ops->alloc_device(hba, name);
 717         if (!dev)
 718                 return NULL;
 719
 720         dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
 721         if (!dev->queues) {
 722                 dev->transport->free_device(dev);
 723                 return NULL;
 724         }
 725
 726         dev->queue_cnt = nr_cpu_ids;
 727         for (i = 0; i < dev->queue_cnt; i++) {
 728                 struct se_device_queue *q;
 729
 730                 q = &dev->queues[i];
 731                 INIT_LIST_HEAD(&q->state_list);
 732                 spin_lock_init(&q->lock);
 733
 734                 init_llist_head(&q->sq.cmd_list);
 735                 INIT_WORK(&q->sq.work, target_queued_submit_work);
 736         }
 737
 738         dev->se_hba = hba;
 739         dev->transport = hba->backend->ops;
 740         dev->transport_flags = dev->transport->transport_flags_default;
 741         dev->prot_length = sizeof(struct t10_pi_tuple);
 742         dev->hba_index = hba->hba_index;
 743
 744         INIT_LIST_HEAD(&dev->dev_sep_list);
 745         INIT_LIST_HEAD(&dev->dev_tmr_list);
 746         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 747         INIT_LIST_HEAD(&dev->qf_cmd_list);
 748         spin_lock_init(&dev->delayed_cmd_lock);
 749         spin_lock_init(&dev->dev_reservation_lock);
 750         spin_lock_init(&dev->se_port_lock);
 751         spin_lock_init(&dev->se_tmr_lock);
 752         spin_lock_init(&dev->qf_cmd_lock);
 753         sema_init(&dev->caw_sem, 1);
 754         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 755         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 756         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 757         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 758         spin_lock_init(&dev->t10_pr.registration_lock);
 759         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 760         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 761         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 762         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 763         spin_lock_init(&dev->t10_alua.lba_map_lock);
 764
 765         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 766
 767         dev->t10_wwn.t10_dev = dev;
 768         /*
 769          * Use OpenFabrics IEEE Company ID: 00 14 05
 770          */
 771         dev->t10_wwn.company_id = 0x001405;
 772
 773         dev->t10_alua.t10_dev = dev;
 774
 775         dev->dev_attrib.da_dev = dev;
 776         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 777         dev->dev_attrib.emulate_dpo = 1;
 778         dev->dev_attrib.emulate_fua_write = 1;
 779         dev->dev_attrib.emulate_fua_read = 1;
 780         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 781         dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
 782         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 783         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 784         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 785         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 786         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 787         dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
 788         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 789         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 790         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 791         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 792         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 793         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 794         dev->dev_attrib.max_unmap_block_desc_count =
 795                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 796         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 797         dev->dev_attrib.unmap_granularity_alignment =
 798                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 799         dev->dev_attrib.unmap_zeroes_data =
 800                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 801         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 802
 803         xcopy_lun = &dev->xcopy_lun;
 804         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 805         init_completion(&xcopy_lun->lun_shutdown_comp);
 806         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 807         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 808         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 809         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 810
 811         /* Preload the default INQUIRY const values */
 812         strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
 813         strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 814                 sizeof(dev->t10_wwn.model));
 815         strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 816                 sizeof(dev->t10_wwn.revision));
 817
 818         return dev;
 819 }
 820
 821 /*
 822  * Check if the underlying struct block_device supports discard and if yes
 823  * configure the UNMAP parameters.
 824  */
 825 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 826                                        struct block_device *bdev)
 827 {
 828         int block_size = bdev_logical_block_size(bdev);
 829
 830         if (!bdev_max_discard_sectors(bdev))
 831                 return false;
 832
 833         attrib->max_unmap_lba_count =
 834                 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
 835         /*
 836          * Currently hardcoded to 1 in Linux/SCSI code..
 837          */
 838         attrib->max_unmap_block_desc_count = 1;
 839         attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
 840         attrib->unmap_granularity_alignment =
 841                 bdev_discard_alignment(bdev) / block_size;
 842         return true;
 843 }
 844 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 845
 846 /*
 847  * Convert from blocksize advertised to the initiator to the 512 byte
 848  * units unconditionally used by the Linux block layer.
 849  */
 850 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 851 {
 852         switch (dev->dev_attrib.block_size) {
 853         case 4096:
 854                 return lb << 3;
 855         case 2048:
 856                 return lb << 2;
 857         case 1024:
 858                 return lb << 1;
 859         default:
 860                 return lb;
 861         }
 862 }
 863 EXPORT_SYMBOL(target_to_linux_sector);
 864
 865 struct devices_idr_iter {
 866         struct config_item *prev_item;
 867         int (*fn)(struct se_device *dev, void *data);
 868         void *data;
 869 };
 870
 871 static int target_devices_idr_iter(int id, void *p, void *data)
 872          __must_hold(&device_mutex)
 873 {
 874         struct devices_idr_iter *iter = data;
 875         struct se_device *dev = p;
 876         int ret;
 877
 878         config_item_put(iter->prev_item);
 879         iter->prev_item = NULL;
 880
 881         /*
 882          * We add the device early to the idr, so it can be used
 883          * by backend modules during configuration. We do not want
 884          * to allow other callers to access partially setup devices,
 885          * so we skip them here.
 886          */
 887         if (!target_dev_configured(dev))
 888                 return 0;
 889
 890         iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
 891         if (!iter->prev_item)
 892                 return 0;
 893         mutex_unlock(&device_mutex);
 894
 895         ret = iter->fn(dev, iter->data);
 896
 897         mutex_lock(&device_mutex);
 898         return ret;
 899 }
 900
 901 /**
 902  * target_for_each_device - iterate over configured devices
 903  * @fn: iterator function
 904  * @data: pointer to data that will be passed to fn
 905  *
 906  * fn must return 0 to continue looping over devices. non-zero will break
 907  * from the loop and return that value to the caller.
 908  */
 909 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 910                            void *data)
 911 {
 912         struct devices_idr_iter iter = { .fn = fn, .data = data };
 913         int ret;
 914
 915         mutex_lock(&device_mutex);
 916         ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
 917         mutex_unlock(&device_mutex);
 918         config_item_put(iter.prev_item);
 919         return ret;
 920 }
 921
 922 int target_configure_device(struct se_device *dev)
 923 {
 924         struct se_hba *hba = dev->se_hba;
 925         int ret, id;
 926
 927         if (target_dev_configured(dev)) {
 928                 pr_err("se_dev->se_dev_ptr already set for storage"
 929                                 " object\n");
 930                 return -EEXIST;
 931         }
 932
 933         /*
 934          * Add early so modules like tcmu can use during its
 935          * configuration.
 936          */
 937         mutex_lock(&device_mutex);
 938         /*
 939          * Use cyclic to try and avoid collisions with devices
 940          * that were recently removed.
 941          */
 942         id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
 943         mutex_unlock(&device_mutex);
 944         if (id < 0) {
 945                 ret = -ENOMEM;
 946                 goto out;
 947         }
 948         dev->dev_index = id;
 949
 950         ret = dev->transport->configure_device(dev);
 951         if (ret)
 952                 goto out_free_index;
 953
 954         if (dev->transport->configure_unmap &&
 955             dev->transport->configure_unmap(dev)) {
 956                 pr_debug("Discard support available, but disabled by default.\n");
 957         }
 958
 959         /*
 960          * XXX: there is not much point to have two different values here..
 961          */
 962         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 963         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 964
 965         /*
 966          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 967          */
 968         dev->dev_attrib.hw_max_sectors =
 969                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 970                                          dev->dev_attrib.hw_block_size);
 971         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 972
 973         dev->creation_time = get_jiffies_64();
 974
 975         ret = core_setup_alua(dev);
 976         if (ret)
 977                 goto out_destroy_device;
 978
 979         /*
 980          * Setup work_queue for QUEUE_FULL
 981          */
 982         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 983
 984         scsi_dump_inquiry(dev);
 985
 986         spin_lock(&hba->device_lock);
 987         hba->dev_count++;
 988         spin_unlock(&hba->device_lock);
 989
 990         dev->dev_flags |= DF_CONFIGURED;
 991
 992         return 0;
 993
 994 out_destroy_device:
 995         dev->transport->destroy_device(dev);
 996 out_free_index:
 997         mutex_lock(&device_mutex);
 998         idr_remove(&devices_idr, dev->dev_index);
 999         mutex_unlock(&device_mutex);
1000 out:
1001         se_release_vpd_for_dev(dev);
1002         return ret;
1003 }
1004
1005 void target_free_device(struct se_device *dev)
1006 {
1007         struct se_hba *hba = dev->se_hba;
1008
1009         WARN_ON(!list_empty(&dev->dev_sep_list));
1010
1011         if (target_dev_configured(dev)) {
1012                 dev->transport->destroy_device(dev);
1013
1014                 mutex_lock(&device_mutex);
1015                 idr_remove(&devices_idr, dev->dev_index);
1016                 mutex_unlock(&device_mutex);
1017
1018                 spin_lock(&hba->device_lock);
1019                 hba->dev_count--;
1020                 spin_unlock(&hba->device_lock);
1021         }
1022
1023         core_alua_free_lu_gp_mem(dev);
1024         core_alua_set_lba_map(dev, NULL, 0, 0);
1025         core_scsi3_free_all_registrations(dev);
1026         se_release_vpd_for_dev(dev);
1027
1028         if (dev->transport->free_prot)
1029                 dev->transport->free_prot(dev);
1030
1031         kfree(dev->queues);
1032         dev->transport->free_device(dev);
1033 }
1034
1035 int core_dev_setup_virtual_lun0(void)
1036 {
1037         struct se_hba *hba;
1038         struct se_device *dev;
1039         char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1040         int ret;
1041
1042         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1043         if (IS_ERR(hba))
1044                 return PTR_ERR(hba);
1045
1046         dev = target_alloc_device(hba, "virt_lun0");
1047         if (!dev) {
1048                 ret = -ENOMEM;
1049                 goto out_free_hba;
1050         }
1051
1052         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1053
1054         ret = target_configure_device(dev);
1055         if (ret)
1056                 goto out_free_se_dev;
1057
1058         lun0_hba = hba;
1059         g_lun0_dev = dev;
1060         return 0;
1061
1062 out_free_se_dev:
1063         target_free_device(dev);
1064 out_free_hba:
1065         core_delete_hba(hba);
1066         return ret;
1067 }
1068
1069
1070 void core_dev_release_virtual_lun0(void)
1071 {
1072         struct se_hba *hba = lun0_hba;
1073
1074         if (!hba)
1075                 return;
1076
1077         if (g_lun0_dev)
1078                 target_free_device(g_lun0_dev);
1079         core_delete_hba(hba);
1080 }
1081
1082 /*
1083  * Common CDB parsing for kernel and user passthrough.
1084  */
1085 sense_reason_t
1086 passthrough_parse_cdb(struct se_cmd *cmd,
1087         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1088 {
1089         unsigned char *cdb = cmd->t_task_cdb;
1090         struct se_device *dev = cmd->se_dev;
1091         unsigned int size;
1092
1093         /*
1094          * For REPORT LUNS we always need to emulate the response, for everything
1095          * else, pass it up.
1096          */
1097         if (cdb[0] == REPORT_LUNS) {
1098                 cmd->execute_cmd = spc_emulate_report_luns;
1099                 return TCM_NO_SENSE;
1100         }
1101
1102         /*
1103          * With emulate_pr disabled, all reservation requests should fail,
1104          * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1105          */
1106         if (!dev->dev_attrib.emulate_pr &&
1107             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1108              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1109              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1110              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1111                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1112         }
1113
1114         /*
1115          * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1116          * emulate the response, since tcmu does not have the information
1117          * required to process these commands.
1118          */
1119         if (!(dev->transport_flags &
1120               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1121                 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1122                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
1123                         size = get_unaligned_be16(&cdb[7]);
1124                         return target_cmd_size_check(cmd, size);
1125                 }
1126                 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1127                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
1128                         size = get_unaligned_be32(&cdb[5]);
1129                         return target_cmd_size_check(cmd, size);
1130                 }
1131
1132                 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1133                         cmd->execute_cmd = target_scsi2_reservation_release;
1134                         if (cdb[0] == RELEASE_10)
1135                                 size = get_unaligned_be16(&cdb[7]);
1136                         else
1137                                 size = cmd->data_length;
1138                         return target_cmd_size_check(cmd, size);
1139                 }
1140                 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1141                         cmd->execute_cmd = target_scsi2_reservation_reserve;
1142                         if (cdb[0] == RESERVE_10)
1143                                 size = get_unaligned_be16(&cdb[7]);
1144                         else
1145                                 size = cmd->data_length;
1146                         return target_cmd_size_check(cmd, size);
1147                 }
1148         }
1149
1150         /* Set DATA_CDB flag for ops that should have it */
1151         switch (cdb[0]) {
1152         case READ_6:
1153         case READ_10:
1154         case READ_12:
1155         case READ_16:
1156         case WRITE_6:
1157         case WRITE_10:
1158         case WRITE_12:
1159         case WRITE_16:
1160         case WRITE_VERIFY:
1161         case WRITE_VERIFY_12:
1162         case WRITE_VERIFY_16:
1163         case COMPARE_AND_WRITE:
1164         case XDWRITEREAD_10:
1165                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1166                 break;
1167         case VARIABLE_LENGTH_CMD:
1168                 switch (get_unaligned_be16(&cdb[8])) {
1169                 case READ_32:
1170                 case WRITE_32:
1171                 case WRITE_VERIFY_32:
1172                 case XDWRITEREAD_32:
1173                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1174                         break;
1175                 }
1176         }
1177
1178         cmd->execute_cmd = exec_cmd;
1179
1180         return TCM_NO_SENSE;
1181 }
1182 EXPORT_SYMBOL(passthrough_parse_cdb);