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