drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * (c) Copyright 2003-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/net.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kthread.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <asm/unaligned.h>
  37 #include <net/sock.h>
  38 #include <net/tcp.h>
  39 #include <scsi/scsi_common.h>
  40 #include <scsi/scsi_proto.h>
  41
  42 #include <target/target_core_base.h>
  43 #include <target/target_core_backend.h>
  44 #include <target/target_core_fabric.h>
  45
  46 #include "target_core_internal.h"
  47 #include "target_core_alua.h"
  48 #include "target_core_pr.h"
  49 #include "target_core_ua.h"
  50
  51 DEFINE_MUTEX(g_device_mutex);
  52 LIST_HEAD(g_device_list);
  53
  54 static struct se_hba *lun0_hba;
  55 /* not static, needed by tpg.c */
  56 struct se_device *g_lun0_dev;
  57
  58 sense_reason_t
  59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
  60 {
  61         struct se_lun *se_lun = NULL;
  62         struct se_session *se_sess = se_cmd->se_sess;
  63         struct se_node_acl *nacl = se_sess->se_node_acl;
  64         struct se_dev_entry *deve;
  65         sense_reason_t ret = TCM_NO_SENSE;
  66
  67         rcu_read_lock();
  68         deve = target_nacl_find_deve(nacl, unpacked_lun);
  69         if (deve) {
  70                 atomic_long_inc(&deve->total_cmds);
  71
  72                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  73                         atomic_long_add(se_cmd->data_length,
  74                                         &deve->write_bytes);
  75                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  76                         atomic_long_add(se_cmd->data_length,
  77                                         &deve->read_bytes);
  78
  79                 se_lun = rcu_dereference(deve->se_lun);
  80
  81                 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
  82                         se_lun = NULL;
  83                         goto out_unlock;
  84                 }
  85
  86                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
  87                 se_cmd->pr_res_key = deve->pr_res_key;
  88                 se_cmd->orig_fe_lun = unpacked_lun;
  89                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  90                 se_cmd->lun_ref_active = true;
  91
  92                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  93                     deve->lun_access_ro) {
  94                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  95                                 " Access for 0x%08llx\n",
  96                                 se_cmd->se_tfo->get_fabric_name(),
  97                                 unpacked_lun);
  98                         rcu_read_unlock();
  99                         ret = TCM_WRITE_PROTECTED;
 100                         goto ref_dev;
 101                 }
 102         }
 103 out_unlock:
 104         rcu_read_unlock();
 105
 106         if (!se_lun) {
 107                 /*
 108                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 109                  * REPORT_LUNS, et al to be returned when no active
 110                  * MappedLUN=0 exists for this Initiator Port.
 111                  */
 112                 if (unpacked_lun != 0) {
 113                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 114                                 " Access for 0x%08llx\n",
 115                                 se_cmd->se_tfo->get_fabric_name(),
 116                                 unpacked_lun);
 117                         return TCM_NON_EXISTENT_LUN;
 118                 }
 119
 120                 se_lun = se_sess->se_tpg->tpg_virt_lun0;
 121                 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
 122                 se_cmd->orig_fe_lun = 0;
 123                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 124
 125                 percpu_ref_get(&se_lun->lun_ref);
 126                 se_cmd->lun_ref_active = true;
 127
 128                 /*
 129                  * Force WRITE PROTECT for virtual LUN 0
 130                  */
 131                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 132                     (se_cmd->data_direction != DMA_NONE)) {
 133                         ret = TCM_WRITE_PROTECTED;
 134                         goto ref_dev;
 135                 }
 136         }
 137         /*
 138          * RCU reference protected by percpu se_lun->lun_ref taken above that
 139          * must drop to zero (including initial reference) before this se_lun
 140          * pointer can be kfree_rcu() by the final se_lun->lun_group put via
 141          * target_core_fabric_configfs.c:target_fabric_port_release
 142          */
 143 ref_dev:
 144         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 145         atomic_long_inc(&se_cmd->se_dev->num_cmds);
 146
 147         if (se_cmd->data_direction == DMA_TO_DEVICE)
 148                 atomic_long_add(se_cmd->data_length,
 149                                 &se_cmd->se_dev->write_bytes);
 150         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 151                 atomic_long_add(se_cmd->data_length,
 152                                 &se_cmd->se_dev->read_bytes);
 153
 154         return ret;
 155 }
 156 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 157
 158 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
 159 {
 160         struct se_dev_entry *deve;
 161         struct se_lun *se_lun = NULL;
 162         struct se_session *se_sess = se_cmd->se_sess;
 163         struct se_node_acl *nacl = se_sess->se_node_acl;
 164         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 165         unsigned long flags;
 166
 167         rcu_read_lock();
 168         deve = target_nacl_find_deve(nacl, unpacked_lun);
 169         if (deve) {
 170                 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
 171                 se_cmd->se_lun = rcu_dereference(deve->se_lun);
 172                 se_lun = rcu_dereference(deve->se_lun);
 173                 se_cmd->pr_res_key = deve->pr_res_key;
 174                 se_cmd->orig_fe_lun = unpacked_lun;
 175         }
 176         rcu_read_unlock();
 177
 178         if (!se_lun) {
 179                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 180                         " Access for 0x%08llx\n",
 181                         se_cmd->se_tfo->get_fabric_name(),
 182                         unpacked_lun);
 183                 return -ENODEV;
 184         }
 185         /*
 186          * XXX: Add percpu se_lun->lun_ref reference count for TMR
 187          */
 188         se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 189         se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
 190
 191         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 192         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 193         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 194
 195         return 0;
 196 }
 197 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 198
 199 bool target_lun_is_rdonly(struct se_cmd *cmd)
 200 {
 201         struct se_session *se_sess = cmd->se_sess;
 202         struct se_dev_entry *deve;
 203         bool ret;
 204
 205         rcu_read_lock();
 206         deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
 207         ret = deve && deve->lun_access_ro;
 208         rcu_read_unlock();
 209
 210         return ret;
 211 }
 212 EXPORT_SYMBOL(target_lun_is_rdonly);
 213
 214 /*
 215  * This function is called from core_scsi3_emulate_pro_register_and_move()
 216  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 217  * when a matching rtpi is found.
 218  */
 219 struct se_dev_entry *core_get_se_deve_from_rtpi(
 220         struct se_node_acl *nacl,
 221         u16 rtpi)
 222 {
 223         struct se_dev_entry *deve;
 224         struct se_lun *lun;
 225         struct se_portal_group *tpg = nacl->se_tpg;
 226
 227         rcu_read_lock();
 228         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 229                 lun = rcu_dereference(deve->se_lun);
 230                 if (!lun) {
 231                         pr_err("%s device entries device pointer is"
 232                                 " NULL, but Initiator has access.\n",
 233                                 tpg->se_tpg_tfo->get_fabric_name());
 234                         continue;
 235                 }
 236                 if (lun->lun_rtpi != rtpi)
 237                         continue;
 238
 239                 kref_get(&deve->pr_kref);
 240                 rcu_read_unlock();
 241
 242                 return deve;
 243         }
 244         rcu_read_unlock();
 245
 246         return NULL;
 247 }
 248
 249 void core_free_device_list_for_node(
 250         struct se_node_acl *nacl,
 251         struct se_portal_group *tpg)
 252 {
 253         struct se_dev_entry *deve;
 254
 255         mutex_lock(&nacl->lun_entry_mutex);
 256         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 257                 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
 258                                         lockdep_is_held(&nacl->lun_entry_mutex));
 259                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 260         }
 261         mutex_unlock(&nacl->lun_entry_mutex);
 262 }
 263
 264 void core_update_device_list_access(
 265         u64 mapped_lun,
 266         bool lun_access_ro,
 267         struct se_node_acl *nacl)
 268 {
 269         struct se_dev_entry *deve;
 270
 271         mutex_lock(&nacl->lun_entry_mutex);
 272         deve = target_nacl_find_deve(nacl, mapped_lun);
 273         if (deve)
 274                 deve->lun_access_ro = lun_access_ro;
 275         mutex_unlock(&nacl->lun_entry_mutex);
 276 }
 277
 278 /*
 279  * Called with rcu_read_lock or nacl->device_list_lock held.
 280  */
 281 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
 282 {
 283         struct se_dev_entry *deve;
 284
 285         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 286                 if (deve->mapped_lun == mapped_lun)
 287                         return deve;
 288
 289         return NULL;
 290 }
 291 EXPORT_SYMBOL(target_nacl_find_deve);
 292
 293 void target_pr_kref_release(struct kref *kref)
 294 {
 295         struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
 296                                                  pr_kref);
 297         complete(&deve->pr_comp);
 298 }
 299
 300 static void
 301 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 302                              bool skip_new)
 303 {
 304         struct se_dev_entry *tmp;
 305
 306         rcu_read_lock();
 307         hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
 308                 if (skip_new && tmp == new)
 309                         continue;
 310                 core_scsi3_ua_allocate(tmp, 0x3F,
 311                                        ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
 312         }
 313         rcu_read_unlock();
 314 }
 315
 316 int core_enable_device_list_for_node(
 317         struct se_lun *lun,
 318         struct se_lun_acl *lun_acl,
 319         u64 mapped_lun,
 320         bool lun_access_ro,
 321         struct se_node_acl *nacl,
 322         struct se_portal_group *tpg)
 323 {
 324         struct se_dev_entry *orig, *new;
 325
 326         new = kzalloc(sizeof(*new), GFP_KERNEL);
 327         if (!new) {
 328                 pr_err("Unable to allocate se_dev_entry memory\n");
 329                 return -ENOMEM;
 330         }
 331
 332         atomic_set(&new->ua_count, 0);
 333         spin_lock_init(&new->ua_lock);
 334         INIT_LIST_HEAD(&new->ua_list);
 335         INIT_LIST_HEAD(&new->lun_link);
 336
 337         new->mapped_lun = mapped_lun;
 338         kref_init(&new->pr_kref);
 339         init_completion(&new->pr_comp);
 340
 341         new->lun_access_ro = lun_access_ro;
 342         new->creation_time = get_jiffies_64();
 343         new->attach_count++;
 344
 345         mutex_lock(&nacl->lun_entry_mutex);
 346         orig = target_nacl_find_deve(nacl, mapped_lun);
 347         if (orig && orig->se_lun) {
 348                 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
 349                                         lockdep_is_held(&nacl->lun_entry_mutex));
 350
 351                 if (orig_lun != lun) {
 352                         pr_err("Existing orig->se_lun doesn't match new lun"
 353                                " for dynamic -> explicit NodeACL conversion:"
 354                                 " %s\n", nacl->initiatorname);
 355                         mutex_unlock(&nacl->lun_entry_mutex);
 356                         kfree(new);
 357                         return -EINVAL;
 358                 }
 359                 if (orig->se_lun_acl != NULL) {
 360                         pr_warn_ratelimited("Detected existing explicit"
 361                                 " se_lun_acl->se_lun_group reference for %s"
 362                                 " mapped_lun: %llu, failing\n",
 363                                  nacl->initiatorname, mapped_lun);
 364                         mutex_unlock(&nacl->lun_entry_mutex);
 365                         kfree(new);
 366                         return -EINVAL;
 367                 }
 368
 369                 rcu_assign_pointer(new->se_lun, lun);
 370                 rcu_assign_pointer(new->se_lun_acl, lun_acl);
 371                 hlist_del_rcu(&orig->link);
 372                 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 373                 mutex_unlock(&nacl->lun_entry_mutex);
 374
 375                 spin_lock(&lun->lun_deve_lock);
 376                 list_del(&orig->lun_link);
 377                 list_add_tail(&new->lun_link, &lun->lun_deve_list);
 378                 spin_unlock(&lun->lun_deve_lock);
 379
 380                 kref_put(&orig->pr_kref, target_pr_kref_release);
 381                 wait_for_completion(&orig->pr_comp);
 382
 383                 target_luns_data_has_changed(nacl, new, true);
 384                 kfree_rcu(orig, rcu_head);
 385                 return 0;
 386         }
 387
 388         rcu_assign_pointer(new->se_lun, lun);
 389         rcu_assign_pointer(new->se_lun_acl, lun_acl);
 390         hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 391         mutex_unlock(&nacl->lun_entry_mutex);
 392
 393         spin_lock(&lun->lun_deve_lock);
 394         list_add_tail(&new->lun_link, &lun->lun_deve_list);
 395         spin_unlock(&lun->lun_deve_lock);
 396
 397         target_luns_data_has_changed(nacl, new, true);
 398         return 0;
 399 }
 400
 401 /*
 402  *      Called with se_node_acl->lun_entry_mutex held.
 403  */
 404 void core_disable_device_list_for_node(
 405         struct se_lun *lun,
 406         struct se_dev_entry *orig,
 407         struct se_node_acl *nacl,
 408         struct se_portal_group *tpg)
 409 {
 410         /*
 411          * rcu_dereference_raw protected by se_lun->lun_group symlink
 412          * reference to se_device->dev_group.
 413          */
 414         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 415         /*
 416          * If the MappedLUN entry is being disabled, the entry in
 417          * lun->lun_deve_list must be removed now before clearing the
 418          * struct se_dev_entry pointers below as logic in
 419          * core_alua_do_transition_tg_pt() depends on these being present.
 420          *
 421          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 422          * that have not been explicitly converted to MappedLUNs ->
 423          * struct se_lun_acl, but we remove deve->lun_link from
 424          * lun->lun_deve_list. This also means that active UAs and
 425          * NodeACL context specific PR metadata for demo-mode
 426          * MappedLUN *deve will be released below..
 427          */
 428         spin_lock(&lun->lun_deve_lock);
 429         list_del(&orig->lun_link);
 430         spin_unlock(&lun->lun_deve_lock);
 431         /*
 432          * Disable struct se_dev_entry LUN ACL mapping
 433          */
 434         core_scsi3_ua_release_all(orig);
 435
 436         hlist_del_rcu(&orig->link);
 437         clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
 438         orig->lun_access_ro = false;
 439         orig->creation_time = 0;
 440         orig->attach_count--;
 441         /*
 442          * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
 443          * or REGISTER_AND_MOVE PR operation to complete.
 444          */
 445         kref_put(&orig->pr_kref, target_pr_kref_release);
 446         wait_for_completion(&orig->pr_comp);
 447
 448         rcu_assign_pointer(orig->se_lun, NULL);
 449         rcu_assign_pointer(orig->se_lun_acl, NULL);
 450
 451         kfree_rcu(orig, rcu_head);
 452
 453         core_scsi3_free_pr_reg_from_nacl(dev, nacl);
 454         target_luns_data_has_changed(nacl, NULL, false);
 455 }
 456
 457 /*      core_clear_lun_from_tpg():
 458  *
 459  *
 460  */
 461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 462 {
 463         struct se_node_acl *nacl;
 464         struct se_dev_entry *deve;
 465
 466         mutex_lock(&tpg->acl_node_mutex);
 467         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 468
 469                 mutex_lock(&nacl->lun_entry_mutex);
 470                 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 471                         struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
 472                                         lockdep_is_held(&nacl->lun_entry_mutex));
 473
 474                         if (lun != tmp_lun)
 475                                 continue;
 476
 477                         core_disable_device_list_for_node(lun, deve, nacl, tpg);
 478                 }
 479                 mutex_unlock(&nacl->lun_entry_mutex);
 480         }
 481         mutex_unlock(&tpg->acl_node_mutex);
 482 }
 483
 484 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
 485 {
 486         struct se_lun *tmp;
 487
 488         spin_lock(&dev->se_port_lock);
 489         if (dev->export_count == 0x0000ffff) {
 490                 pr_warn("Reached dev->dev_port_count =="
 491                                 " 0x0000ffff\n");
 492                 spin_unlock(&dev->se_port_lock);
 493                 return -ENOSPC;
 494         }
 495 again:
 496         /*
 497          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 498          * Here is the table from spc4r17 section 7.7.3.8.
 499          *
 500          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 501          *
 502          * Code      Description
 503          * 0h        Reserved
 504          * 1h        Relative port 1, historically known as port A
 505          * 2h        Relative port 2, historically known as port B
 506          * 3h to FFFFh    Relative port 3 through 65 535
 507          */
 508         lun->lun_rtpi = dev->dev_rpti_counter++;
 509         if (!lun->lun_rtpi)
 510                 goto again;
 511
 512         list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
 513                 /*
 514                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 515                  * for 16-bit wrap..
 516                  */
 517                 if (lun->lun_rtpi == tmp->lun_rtpi)
 518                         goto again;
 519         }
 520         spin_unlock(&dev->se_port_lock);
 521
 522         return 0;
 523 }
 524
 525 static void se_release_vpd_for_dev(struct se_device *dev)
 526 {
 527         struct t10_vpd *vpd, *vpd_tmp;
 528
 529         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 530         list_for_each_entry_safe(vpd, vpd_tmp,
 531                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 532                 list_del(&vpd->vpd_list);
 533                 kfree(vpd);
 534         }
 535         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 536 }
 537
 538 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 539 {
 540         u32 aligned_max_sectors;
 541         u32 alignment;
 542         /*
 543          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 544          * transport_allocate_data_tasks() operation.
 545          */
 546         alignment = max(1ul, PAGE_SIZE / block_size);
 547         aligned_max_sectors = rounddown(max_sectors, alignment);
 548
 549         if (max_sectors != aligned_max_sectors)
 550                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 551                         max_sectors, aligned_max_sectors);
 552
 553         return aligned_max_sectors;
 554 }
 555
 556 int core_dev_add_lun(
 557         struct se_portal_group *tpg,
 558         struct se_device *dev,
 559         struct se_lun *lun)
 560 {
 561         int rc;
 562
 563         rc = core_tpg_add_lun(tpg, lun, false, dev);
 564         if (rc < 0)
 565                 return rc;
 566
 567         pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
 568                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
 569                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 570                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
 571         /*
 572          * Update LUN maps for dynamically added initiators when
 573          * generate_node_acl is enabled.
 574          */
 575         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
 576                 struct se_node_acl *acl;
 577
 578                 mutex_lock(&tpg->acl_node_mutex);
 579                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 580                         if (acl->dynamic_node_acl &&
 581                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
 582                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
 583                                 core_tpg_add_node_to_devs(acl, tpg, lun);
 584                         }
 585                 }
 586                 mutex_unlock(&tpg->acl_node_mutex);
 587         }
 588
 589         return 0;
 590 }
 591
 592 /*      core_dev_del_lun():
 593  *
 594  *
 595  */
 596 void core_dev_del_lun(
 597         struct se_portal_group *tpg,
 598         struct se_lun *lun)
 599 {
 600         pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
 601                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
 602                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 603                 tpg->se_tpg_tfo->get_fabric_name());
 604
 605         core_tpg_remove_lun(tpg, lun);
 606 }
 607
 608 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
 609         struct se_portal_group *tpg,
 610         struct se_node_acl *nacl,
 611         u64 mapped_lun,
 612         int *ret)
 613 {
 614         struct se_lun_acl *lacl;
 615
 616         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
 617                 pr_err("%s InitiatorName exceeds maximum size.\n",
 618                         tpg->se_tpg_tfo->get_fabric_name());
 619                 *ret = -EOVERFLOW;
 620                 return NULL;
 621         }
 622         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
 623         if (!lacl) {
 624                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
 625                 *ret = -ENOMEM;
 626                 return NULL;
 627         }
 628
 629         lacl->mapped_lun = mapped_lun;
 630         lacl->se_lun_nacl = nacl;
 631
 632         return lacl;
 633 }
 634
 635 int core_dev_add_initiator_node_lun_acl(
 636         struct se_portal_group *tpg,
 637         struct se_lun_acl *lacl,
 638         struct se_lun *lun,
 639         bool lun_access_ro)
 640 {
 641         struct se_node_acl *nacl = lacl->se_lun_nacl;
 642         /*
 643          * rcu_dereference_raw protected by se_lun->lun_group symlink
 644          * reference to se_device->dev_group.
 645          */
 646         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 647
 648         if (!nacl)
 649                 return -EINVAL;
 650
 651         if (lun->lun_access_ro)
 652                 lun_access_ro = true;
 653
 654         lacl->se_lun = lun;
 655
 656         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
 657                         lun_access_ro, nacl, tpg) < 0)
 658                 return -EINVAL;
 659
 660         pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
 661                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 662                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
 663                 lun_access_ro ? "RO" : "RW",
 664                 nacl->initiatorname);
 665         /*
 666          * Check to see if there are any existing persistent reservation APTPL
 667          * pre-registrations that need to be enabled for this LUN ACL..
 668          */
 669         core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
 670                                             lacl->mapped_lun);
 671         return 0;
 672 }
 673
 674 int core_dev_del_initiator_node_lun_acl(
 675         struct se_lun *lun,
 676         struct se_lun_acl *lacl)
 677 {
 678         struct se_portal_group *tpg = lun->lun_tpg;
 679         struct se_node_acl *nacl;
 680         struct se_dev_entry *deve;
 681
 682         nacl = lacl->se_lun_nacl;
 683         if (!nacl)
 684                 return -EINVAL;
 685
 686         mutex_lock(&nacl->lun_entry_mutex);
 687         deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
 688         if (deve)
 689                 core_disable_device_list_for_node(lun, deve, nacl, tpg);
 690         mutex_unlock(&nacl->lun_entry_mutex);
 691
 692         pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
 693                 " InitiatorNode: %s Mapped LUN: %llu\n",
 694                 tpg->se_tpg_tfo->get_fabric_name(),
 695                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 696                 nacl->initiatorname, lacl->mapped_lun);
 697
 698         return 0;
 699 }
 700
 701 void core_dev_free_initiator_node_lun_acl(
 702         struct se_portal_group *tpg,
 703         struct se_lun_acl *lacl)
 704 {
 705         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
 706                 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
 707                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 708                 tpg->se_tpg_tfo->get_fabric_name(),
 709                 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
 710
 711         kfree(lacl);
 712 }
 713
 714 static void scsi_dump_inquiry(struct se_device *dev)
 715 {
 716         struct t10_wwn *wwn = &dev->t10_wwn;
 717         char buf[17];
 718         int i, device_type;
 719         /*
 720          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
 721          */
 722         for (i = 0; i < 8; i++)
 723                 if (wwn->vendor[i] >= 0x20)
 724                         buf[i] = wwn->vendor[i];
 725                 else
 726                         buf[i] = ' ';
 727         buf[i] = '\0';
 728         pr_debug("  Vendor: %s\n", buf);
 729
 730         for (i = 0; i < 16; i++)
 731                 if (wwn->model[i] >= 0x20)
 732                         buf[i] = wwn->model[i];
 733                 else
 734                         buf[i] = ' ';
 735         buf[i] = '\0';
 736         pr_debug("  Model: %s\n", buf);
 737
 738         for (i = 0; i < 4; i++)
 739                 if (wwn->revision[i] >= 0x20)
 740                         buf[i] = wwn->revision[i];
 741                 else
 742                         buf[i] = ' ';
 743         buf[i] = '\0';
 744         pr_debug("  Revision: %s\n", buf);
 745
 746         device_type = dev->transport->get_device_type(dev);
 747         pr_debug("  Type:   %s ", scsi_device_type(device_type));
 748 }
 749
 750 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 751 {
 752         struct se_device *dev;
 753         struct se_lun *xcopy_lun;
 754
 755         dev = hba->backend->ops->alloc_device(hba, name);
 756         if (!dev)
 757                 return NULL;
 758
 759         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
 760         dev->se_hba = hba;
 761         dev->transport = hba->backend->ops;
 762         dev->prot_length = sizeof(struct t10_pi_tuple);
 763         dev->hba_index = hba->hba_index;
 764
 765         INIT_LIST_HEAD(&dev->dev_list);
 766         INIT_LIST_HEAD(&dev->dev_sep_list);
 767         INIT_LIST_HEAD(&dev->dev_tmr_list);
 768         INIT_LIST_HEAD(&dev->delayed_cmd_list);
 769         INIT_LIST_HEAD(&dev->state_list);
 770         INIT_LIST_HEAD(&dev->qf_cmd_list);
 771         INIT_LIST_HEAD(&dev->g_dev_node);
 772         spin_lock_init(&dev->execute_task_lock);
 773         spin_lock_init(&dev->delayed_cmd_lock);
 774         spin_lock_init(&dev->dev_reservation_lock);
 775         spin_lock_init(&dev->se_port_lock);
 776         spin_lock_init(&dev->se_tmr_lock);
 777         spin_lock_init(&dev->qf_cmd_lock);
 778         sema_init(&dev->caw_sem, 1);
 779         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
 780         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
 781         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
 782         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
 783         spin_lock_init(&dev->t10_pr.registration_lock);
 784         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
 785         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 786         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 787         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
 788         spin_lock_init(&dev->t10_alua.lba_map_lock);
 789
 790         INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
 791
 792         dev->t10_wwn.t10_dev = dev;
 793         dev->t10_alua.t10_dev = dev;
 794
 795         dev->dev_attrib.da_dev = dev;
 796         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
 797         dev->dev_attrib.emulate_dpo = 1;
 798         dev->dev_attrib.emulate_fua_write = 1;
 799         dev->dev_attrib.emulate_fua_read = 1;
 800         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 801         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 802         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
 803         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 804         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 805         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
 806         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
 807         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
 808         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 809         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
 810         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
 811         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 812         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 813         dev->dev_attrib.max_unmap_block_desc_count =
 814                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 815         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 816         dev->dev_attrib.unmap_granularity_alignment =
 817                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 818         dev->dev_attrib.unmap_zeroes_data =
 819                                 DA_UNMAP_ZEROES_DATA_DEFAULT;
 820         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
 821
 822         xcopy_lun = &dev->xcopy_lun;
 823         rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
 824         init_completion(&xcopy_lun->lun_ref_comp);
 825         init_completion(&xcopy_lun->lun_shutdown_comp);
 826         INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
 827         INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
 828         mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
 829         xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 830
 831         return dev;
 832 }
 833
 834 /*
 835  * Check if the underlying struct block_device request_queue supports
 836  * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 837  * in ATA and we need to set TPE=1
 838  */
 839 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 840                                        struct request_queue *q)
 841 {
 842         int block_size = queue_logical_block_size(q);
 843
 844         if (!blk_queue_discard(q))
 845                 return false;
 846
 847         attrib->max_unmap_lba_count =
 848                 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
 849         /*
 850          * Currently hardcoded to 1 in Linux/SCSI code..
 851          */
 852         attrib->max_unmap_block_desc_count = 1;
 853         attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 854         attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 855                                                                 block_size;
 856         attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
 857         return true;
 858 }
 859 EXPORT_SYMBOL(target_configure_unmap_from_queue);
 860
 861 /*
 862  * Convert from blocksize advertised to the initiator to the 512 byte
 863  * units unconditionally used by the Linux block layer.
 864  */
 865 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
 866 {
 867         switch (dev->dev_attrib.block_size) {
 868         case 4096:
 869                 return lb << 3;
 870         case 2048:
 871                 return lb << 2;
 872         case 1024:
 873                 return lb << 1;
 874         default:
 875                 return lb;
 876         }
 877 }
 878 EXPORT_SYMBOL(target_to_linux_sector);
 879
 880 int target_configure_device(struct se_device *dev)
 881 {
 882         struct se_hba *hba = dev->se_hba;
 883         int ret;
 884
 885         if (dev->dev_flags & DF_CONFIGURED) {
 886                 pr_err("se_dev->se_dev_ptr already set for storage"
 887                                 " object\n");
 888                 return -EEXIST;
 889         }
 890
 891         ret = dev->transport->configure_device(dev);
 892         if (ret)
 893                 goto out;
 894         /*
 895          * XXX: there is not much point to have two different values here..
 896          */
 897         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
 898         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
 899
 900         /*
 901          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 902          */
 903         dev->dev_attrib.hw_max_sectors =
 904                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
 905                                          dev->dev_attrib.hw_block_size);
 906         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
 907
 908         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
 909         dev->creation_time = get_jiffies_64();
 910
 911         ret = core_setup_alua(dev);
 912         if (ret)
 913                 goto out;
 914
 915         /*
 916          * Startup the struct se_device processing thread
 917          */
 918         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
 919                                       dev->transport->name);
 920         if (!dev->tmr_wq) {
 921                 pr_err("Unable to create tmr workqueue for %s\n",
 922                         dev->transport->name);
 923                 ret = -ENOMEM;
 924                 goto out_free_alua;
 925         }
 926
 927         /*
 928          * Setup work_queue for QUEUE_FULL
 929          */
 930         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
 931
 932         /*
 933          * Preload the initial INQUIRY const values if we are doing
 934          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
 935          * passthrough because this is being provided by the backend LLD.
 936          */
 937         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
 938                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
 939                 strncpy(&dev->t10_wwn.model[0],
 940                         dev->transport->inquiry_prod, 16);
 941                 strncpy(&dev->t10_wwn.revision[0],
 942                         dev->transport->inquiry_rev, 4);
 943         }
 944
 945         scsi_dump_inquiry(dev);
 946
 947         spin_lock(&hba->device_lock);
 948         hba->dev_count++;
 949         spin_unlock(&hba->device_lock);
 950
 951         mutex_lock(&g_device_mutex);
 952         list_add_tail(&dev->g_dev_node, &g_device_list);
 953         mutex_unlock(&g_device_mutex);
 954
 955         dev->dev_flags |= DF_CONFIGURED;
 956
 957         return 0;
 958
 959 out_free_alua:
 960         core_alua_free_lu_gp_mem(dev);
 961 out:
 962         se_release_vpd_for_dev(dev);
 963         return ret;
 964 }
 965
 966 void target_free_device(struct se_device *dev)
 967 {
 968         struct se_hba *hba = dev->se_hba;
 969
 970         WARN_ON(!list_empty(&dev->dev_sep_list));
 971
 972         if (dev->dev_flags & DF_CONFIGURED) {
 973                 destroy_workqueue(dev->tmr_wq);
 974
 975                 mutex_lock(&g_device_mutex);
 976                 list_del(&dev->g_dev_node);
 977                 mutex_unlock(&g_device_mutex);
 978
 979                 spin_lock(&hba->device_lock);
 980                 hba->dev_count--;
 981                 spin_unlock(&hba->device_lock);
 982         }
 983
 984         core_alua_free_lu_gp_mem(dev);
 985         core_alua_set_lba_map(dev, NULL, 0, 0);
 986         core_scsi3_free_all_registrations(dev);
 987         se_release_vpd_for_dev(dev);
 988
 989         if (dev->transport->free_prot)
 990                 dev->transport->free_prot(dev);
 991
 992         dev->transport->free_device(dev);
 993 }
 994
 995 int core_dev_setup_virtual_lun0(void)
 996 {
 997         struct se_hba *hba;
 998         struct se_device *dev;
 999         char buf[] = "rd_pages=8,rd_nullio=1";
1000         int ret;
1001
1002         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1003         if (IS_ERR(hba))
1004                 return PTR_ERR(hba);
1005
1006         dev = target_alloc_device(hba, "virt_lun0");
1007         if (!dev) {
1008                 ret = -ENOMEM;
1009                 goto out_free_hba;
1010         }
1011
1012         hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1013
1014         ret = target_configure_device(dev);
1015         if (ret)
1016                 goto out_free_se_dev;
1017
1018         lun0_hba = hba;
1019         g_lun0_dev = dev;
1020         return 0;
1021
1022 out_free_se_dev:
1023         target_free_device(dev);
1024 out_free_hba:
1025         core_delete_hba(hba);
1026         return ret;
1027 }
1028
1029
1030 void core_dev_release_virtual_lun0(void)
1031 {
1032         struct se_hba *hba = lun0_hba;
1033
1034         if (!hba)
1035                 return;
1036
1037         if (g_lun0_dev)
1038                 target_free_device(g_lun0_dev);
1039         core_delete_hba(hba);
1040 }
1041
1042 /*
1043  * Common CDB parsing for kernel and user passthrough.
1044  */
1045 sense_reason_t
1046 passthrough_parse_cdb(struct se_cmd *cmd,
1047         sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1048 {
1049         unsigned char *cdb = cmd->t_task_cdb;
1050
1051         /*
1052          * For REPORT LUNS we always need to emulate the response, for everything
1053          * else, pass it up.
1054          */
1055         if (cdb[0] == REPORT_LUNS) {
1056                 cmd->execute_cmd = spc_emulate_report_luns;
1057                 return TCM_NO_SENSE;
1058         }
1059
1060         /* Set DATA_CDB flag for ops that should have it */
1061         switch (cdb[0]) {
1062         case READ_6:
1063         case READ_10:
1064         case READ_12:
1065         case READ_16:
1066         case WRITE_6:
1067         case WRITE_10:
1068         case WRITE_12:
1069         case WRITE_16:
1070         case WRITE_VERIFY:
1071         case WRITE_VERIFY_12:
1072         case 0x8e: /* WRITE_VERIFY_16 */
1073         case COMPARE_AND_WRITE:
1074         case XDWRITEREAD_10:
1075                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1076                 break;
1077         case VARIABLE_LENGTH_CMD:
1078                 switch (get_unaligned_be16(&cdb[8])) {
1079                 case READ_32:
1080                 case WRITE_32:
1081                 case 0x0c: /* WRITE_VERIFY_32 */
1082                 case XDWRITEREAD_32:
1083                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1084                         break;
1085                 }
1086         }
1087
1088         cmd->execute_cmd = exec_cmd;
1089
1090         return TCM_NO_SENSE;
1091 }
1092 EXPORT_SYMBOL(passthrough_parse_cdb);