1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
4 * This file contains the TCM Virtual Device and Disk Transport
5 * agnostic related functions.
7 * (c) Copyright 2003-2013 Datera, Inc.
9 * Nicholas A. Bellinger <nab@kernel.org>
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.
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.
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.
25 ******************************************************************************/
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>
35 #include <linux/export.h>
36 #include <linux/t10-pi.h>
37 #include <asm/unaligned.h>
40 #include <scsi/scsi_common.h>
41 #include <scsi/scsi_proto.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_backend.h>
45 #include <target/target_core_fabric.h>
47 #include "target_core_internal.h"
48 #include "target_core_alua.h"
49 #include "target_core_pr.h"
50 #include "target_core_ua.h"
52 DEFINE_MUTEX(g_device_mutex);
53 LIST_HEAD(g_device_list);
55 static struct se_hba *lun0_hba;
56 /* not static, needed by tpg.c */
57 struct se_device *g_lun0_dev;
60 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
62 struct se_lun *se_lun = NULL;
63 struct se_session *se_sess = se_cmd->se_sess;
64 struct se_node_acl *nacl = se_sess->se_node_acl;
65 struct se_dev_entry *deve;
66 sense_reason_t ret = TCM_NO_SENSE;
69 deve = target_nacl_find_deve(nacl, unpacked_lun);
71 atomic_long_inc(&deve->total_cmds);
73 if (se_cmd->data_direction == DMA_TO_DEVICE)
74 atomic_long_add(se_cmd->data_length,
76 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
77 atomic_long_add(se_cmd->data_length,
80 se_lun = rcu_dereference(deve->se_lun);
82 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
87 se_cmd->se_lun = rcu_dereference(deve->se_lun);
88 se_cmd->pr_res_key = deve->pr_res_key;
89 se_cmd->orig_fe_lun = unpacked_lun;
90 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
91 se_cmd->lun_ref_active = true;
93 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
94 deve->lun_access_ro) {
95 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
96 " Access for 0x%08llx\n",
97 se_cmd->se_tfo->get_fabric_name(),
100 ret = TCM_WRITE_PROTECTED;
109 * Use the se_portal_group->tpg_virt_lun0 to allow for
110 * REPORT_LUNS, et al to be returned when no active
111 * MappedLUN=0 exists for this Initiator Port.
113 if (unpacked_lun != 0) {
114 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
115 " Access for 0x%08llx\n",
116 se_cmd->se_tfo->get_fabric_name(),
118 return TCM_NON_EXISTENT_LUN;
121 se_lun = se_sess->se_tpg->tpg_virt_lun0;
122 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
123 se_cmd->orig_fe_lun = 0;
124 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
126 percpu_ref_get(&se_lun->lun_ref);
127 se_cmd->lun_ref_active = true;
130 * Force WRITE PROTECT for virtual LUN 0
132 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
133 (se_cmd->data_direction != DMA_NONE)) {
134 ret = TCM_WRITE_PROTECTED;
139 * RCU reference protected by percpu se_lun->lun_ref taken above that
140 * must drop to zero (including initial reference) before this se_lun
141 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
142 * target_core_fabric_configfs.c:target_fabric_port_release
145 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
146 atomic_long_inc(&se_cmd->se_dev->num_cmds);
148 if (se_cmd->data_direction == DMA_TO_DEVICE)
149 atomic_long_add(se_cmd->data_length,
150 &se_cmd->se_dev->write_bytes);
151 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
152 atomic_long_add(se_cmd->data_length,
153 &se_cmd->se_dev->read_bytes);
157 EXPORT_SYMBOL(transport_lookup_cmd_lun);
159 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
161 struct se_dev_entry *deve;
162 struct se_lun *se_lun = NULL;
163 struct se_session *se_sess = se_cmd->se_sess;
164 struct se_node_acl *nacl = se_sess->se_node_acl;
165 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
169 deve = target_nacl_find_deve(nacl, unpacked_lun);
171 se_lun = rcu_dereference(deve->se_lun);
173 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
178 se_cmd->se_lun = rcu_dereference(deve->se_lun);
179 se_cmd->pr_res_key = deve->pr_res_key;
180 se_cmd->orig_fe_lun = unpacked_lun;
181 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
182 se_cmd->lun_ref_active = true;
188 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
189 " Access for 0x%08llx\n",
190 se_cmd->se_tfo->get_fabric_name(),
194 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
195 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
197 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
198 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
199 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
203 EXPORT_SYMBOL(transport_lookup_tmr_lun);
205 bool target_lun_is_rdonly(struct se_cmd *cmd)
207 struct se_session *se_sess = cmd->se_sess;
208 struct se_dev_entry *deve;
212 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
213 ret = deve && deve->lun_access_ro;
218 EXPORT_SYMBOL(target_lun_is_rdonly);
221 * This function is called from core_scsi3_emulate_pro_register_and_move()
222 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
223 * when a matching rtpi is found.
225 struct se_dev_entry *core_get_se_deve_from_rtpi(
226 struct se_node_acl *nacl,
229 struct se_dev_entry *deve;
231 struct se_portal_group *tpg = nacl->se_tpg;
234 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
235 lun = rcu_dereference(deve->se_lun);
237 pr_err("%s device entries device pointer is"
238 " NULL, but Initiator has access.\n",
239 tpg->se_tpg_tfo->get_fabric_name());
242 if (lun->lun_rtpi != rtpi)
245 kref_get(&deve->pr_kref);
255 void core_free_device_list_for_node(
256 struct se_node_acl *nacl,
257 struct se_portal_group *tpg)
259 struct se_dev_entry *deve;
261 mutex_lock(&nacl->lun_entry_mutex);
262 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
263 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
264 lockdep_is_held(&nacl->lun_entry_mutex));
265 core_disable_device_list_for_node(lun, deve, nacl, tpg);
267 mutex_unlock(&nacl->lun_entry_mutex);
270 void core_update_device_list_access(
273 struct se_node_acl *nacl)
275 struct se_dev_entry *deve;
277 mutex_lock(&nacl->lun_entry_mutex);
278 deve = target_nacl_find_deve(nacl, mapped_lun);
280 deve->lun_access_ro = lun_access_ro;
281 mutex_unlock(&nacl->lun_entry_mutex);
285 * Called with rcu_read_lock or nacl->device_list_lock held.
287 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
289 struct se_dev_entry *deve;
291 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
292 if (deve->mapped_lun == mapped_lun)
297 EXPORT_SYMBOL(target_nacl_find_deve);
299 void target_pr_kref_release(struct kref *kref)
301 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
303 complete(&deve->pr_comp);
307 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
310 struct se_dev_entry *tmp;
313 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
314 if (skip_new && tmp == new)
316 core_scsi3_ua_allocate(tmp, 0x3F,
317 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
322 int core_enable_device_list_for_node(
324 struct se_lun_acl *lun_acl,
327 struct se_node_acl *nacl,
328 struct se_portal_group *tpg)
330 struct se_dev_entry *orig, *new;
332 new = kzalloc(sizeof(*new), GFP_KERNEL);
334 pr_err("Unable to allocate se_dev_entry memory\n");
338 atomic_set(&new->ua_count, 0);
339 spin_lock_init(&new->ua_lock);
340 INIT_LIST_HEAD(&new->ua_list);
341 INIT_LIST_HEAD(&new->lun_link);
343 new->mapped_lun = mapped_lun;
344 kref_init(&new->pr_kref);
345 init_completion(&new->pr_comp);
347 new->lun_access_ro = lun_access_ro;
348 new->creation_time = get_jiffies_64();
351 mutex_lock(&nacl->lun_entry_mutex);
352 orig = target_nacl_find_deve(nacl, mapped_lun);
353 if (orig && orig->se_lun) {
354 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
355 lockdep_is_held(&nacl->lun_entry_mutex));
357 if (orig_lun != lun) {
358 pr_err("Existing orig->se_lun doesn't match new lun"
359 " for dynamic -> explicit NodeACL conversion:"
360 " %s\n", nacl->initiatorname);
361 mutex_unlock(&nacl->lun_entry_mutex);
365 if (orig->se_lun_acl != NULL) {
366 pr_warn_ratelimited("Detected existing explicit"
367 " se_lun_acl->se_lun_group reference for %s"
368 " mapped_lun: %llu, failing\n",
369 nacl->initiatorname, mapped_lun);
370 mutex_unlock(&nacl->lun_entry_mutex);
375 rcu_assign_pointer(new->se_lun, lun);
376 rcu_assign_pointer(new->se_lun_acl, lun_acl);
377 hlist_del_rcu(&orig->link);
378 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
379 mutex_unlock(&nacl->lun_entry_mutex);
381 spin_lock(&lun->lun_deve_lock);
382 list_del(&orig->lun_link);
383 list_add_tail(&new->lun_link, &lun->lun_deve_list);
384 spin_unlock(&lun->lun_deve_lock);
386 kref_put(&orig->pr_kref, target_pr_kref_release);
387 wait_for_completion(&orig->pr_comp);
389 target_luns_data_has_changed(nacl, new, true);
390 kfree_rcu(orig, rcu_head);
394 rcu_assign_pointer(new->se_lun, lun);
395 rcu_assign_pointer(new->se_lun_acl, lun_acl);
396 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
397 mutex_unlock(&nacl->lun_entry_mutex);
399 spin_lock(&lun->lun_deve_lock);
400 list_add_tail(&new->lun_link, &lun->lun_deve_list);
401 spin_unlock(&lun->lun_deve_lock);
403 target_luns_data_has_changed(nacl, new, true);
408 * Called with se_node_acl->lun_entry_mutex held.
410 void core_disable_device_list_for_node(
412 struct se_dev_entry *orig,
413 struct se_node_acl *nacl,
414 struct se_portal_group *tpg)
417 * rcu_dereference_raw protected by se_lun->lun_group symlink
418 * reference to se_device->dev_group.
420 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
422 * If the MappedLUN entry is being disabled, the entry in
423 * lun->lun_deve_list must be removed now before clearing the
424 * struct se_dev_entry pointers below as logic in
425 * core_alua_do_transition_tg_pt() depends on these being present.
427 * deve->se_lun_acl will be NULL for demo-mode created LUNs
428 * that have not been explicitly converted to MappedLUNs ->
429 * struct se_lun_acl, but we remove deve->lun_link from
430 * lun->lun_deve_list. This also means that active UAs and
431 * NodeACL context specific PR metadata for demo-mode
432 * MappedLUN *deve will be released below..
434 spin_lock(&lun->lun_deve_lock);
435 list_del(&orig->lun_link);
436 spin_unlock(&lun->lun_deve_lock);
438 * Disable struct se_dev_entry LUN ACL mapping
440 core_scsi3_ua_release_all(orig);
442 hlist_del_rcu(&orig->link);
443 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
444 orig->lun_access_ro = false;
445 orig->creation_time = 0;
446 orig->attach_count--;
448 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
449 * or REGISTER_AND_MOVE PR operation to complete.
451 kref_put(&orig->pr_kref, target_pr_kref_release);
452 wait_for_completion(&orig->pr_comp);
454 rcu_assign_pointer(orig->se_lun, NULL);
455 rcu_assign_pointer(orig->se_lun_acl, NULL);
457 kfree_rcu(orig, rcu_head);
459 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
460 target_luns_data_has_changed(nacl, NULL, false);
463 /* core_clear_lun_from_tpg():
467 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
469 struct se_node_acl *nacl;
470 struct se_dev_entry *deve;
472 mutex_lock(&tpg->acl_node_mutex);
473 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
475 mutex_lock(&nacl->lun_entry_mutex);
476 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
477 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
478 lockdep_is_held(&nacl->lun_entry_mutex));
483 core_disable_device_list_for_node(lun, deve, nacl, tpg);
485 mutex_unlock(&nacl->lun_entry_mutex);
487 mutex_unlock(&tpg->acl_node_mutex);
490 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
494 spin_lock(&dev->se_port_lock);
495 if (dev->export_count == 0x0000ffff) {
496 pr_warn("Reached dev->dev_port_count =="
498 spin_unlock(&dev->se_port_lock);
503 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
504 * Here is the table from spc4r17 section 7.7.3.8.
506 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
510 * 1h Relative port 1, historically known as port A
511 * 2h Relative port 2, historically known as port B
512 * 3h to FFFFh Relative port 3 through 65 535
514 lun->lun_rtpi = dev->dev_rpti_counter++;
518 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
520 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
523 if (lun->lun_rtpi == tmp->lun_rtpi)
526 spin_unlock(&dev->se_port_lock);
531 static void se_release_vpd_for_dev(struct se_device *dev)
533 struct t10_vpd *vpd, *vpd_tmp;
535 spin_lock(&dev->t10_wwn.t10_vpd_lock);
536 list_for_each_entry_safe(vpd, vpd_tmp,
537 &dev->t10_wwn.t10_vpd_list, vpd_list) {
538 list_del(&vpd->vpd_list);
541 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
544 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
546 u32 aligned_max_sectors;
549 * Limit max_sectors to a PAGE_SIZE aligned value for modern
550 * transport_allocate_data_tasks() operation.
552 alignment = max(1ul, PAGE_SIZE / block_size);
553 aligned_max_sectors = rounddown(max_sectors, alignment);
555 if (max_sectors != aligned_max_sectors)
556 pr_info("Rounding down aligned max_sectors from %u to %u\n",
557 max_sectors, aligned_max_sectors);
559 return aligned_max_sectors;
562 int core_dev_add_lun(
563 struct se_portal_group *tpg,
564 struct se_device *dev,
569 rc = core_tpg_add_lun(tpg, lun, false, dev);
573 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
574 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
575 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
576 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
578 * Update LUN maps for dynamically added initiators when
579 * generate_node_acl is enabled.
581 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
582 struct se_node_acl *acl;
584 mutex_lock(&tpg->acl_node_mutex);
585 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
586 if (acl->dynamic_node_acl &&
587 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
588 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
589 core_tpg_add_node_to_devs(acl, tpg, lun);
592 mutex_unlock(&tpg->acl_node_mutex);
598 /* core_dev_del_lun():
602 void core_dev_del_lun(
603 struct se_portal_group *tpg,
606 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
607 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
608 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
609 tpg->se_tpg_tfo->get_fabric_name());
611 core_tpg_remove_lun(tpg, lun);
614 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
615 struct se_portal_group *tpg,
616 struct se_node_acl *nacl,
620 struct se_lun_acl *lacl;
622 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
623 pr_err("%s InitiatorName exceeds maximum size.\n",
624 tpg->se_tpg_tfo->get_fabric_name());
628 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
630 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
635 lacl->mapped_lun = mapped_lun;
636 lacl->se_lun_nacl = nacl;
641 int core_dev_add_initiator_node_lun_acl(
642 struct se_portal_group *tpg,
643 struct se_lun_acl *lacl,
647 struct se_node_acl *nacl = lacl->se_lun_nacl;
649 * rcu_dereference_raw protected by se_lun->lun_group symlink
650 * reference to se_device->dev_group.
652 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
657 if (lun->lun_access_ro)
658 lun_access_ro = true;
662 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
663 lun_access_ro, nacl, tpg) < 0)
666 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
667 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
668 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
669 lun_access_ro ? "RO" : "RW",
670 nacl->initiatorname);
672 * Check to see if there are any existing persistent reservation APTPL
673 * pre-registrations that need to be enabled for this LUN ACL..
675 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
680 int core_dev_del_initiator_node_lun_acl(
682 struct se_lun_acl *lacl)
684 struct se_portal_group *tpg = lun->lun_tpg;
685 struct se_node_acl *nacl;
686 struct se_dev_entry *deve;
688 nacl = lacl->se_lun_nacl;
692 mutex_lock(&nacl->lun_entry_mutex);
693 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
695 core_disable_device_list_for_node(lun, deve, nacl, tpg);
696 mutex_unlock(&nacl->lun_entry_mutex);
698 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
699 " InitiatorNode: %s Mapped LUN: %llu\n",
700 tpg->se_tpg_tfo->get_fabric_name(),
701 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
702 nacl->initiatorname, lacl->mapped_lun);
707 void core_dev_free_initiator_node_lun_acl(
708 struct se_portal_group *tpg,
709 struct se_lun_acl *lacl)
711 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
712 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
713 tpg->se_tpg_tfo->tpg_get_tag(tpg),
714 tpg->se_tpg_tfo->get_fabric_name(),
715 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
720 static void scsi_dump_inquiry(struct se_device *dev)
722 struct t10_wwn *wwn = &dev->t10_wwn;
726 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
728 for (i = 0; i < 8; i++)
729 if (wwn->vendor[i] >= 0x20)
730 buf[i] = wwn->vendor[i];
734 pr_debug(" Vendor: %s\n", buf);
736 for (i = 0; i < 16; i++)
737 if (wwn->model[i] >= 0x20)
738 buf[i] = wwn->model[i];
742 pr_debug(" Model: %s\n", buf);
744 for (i = 0; i < 4; i++)
745 if (wwn->revision[i] >= 0x20)
746 buf[i] = wwn->revision[i];
750 pr_debug(" Revision: %s\n", buf);
752 device_type = dev->transport->get_device_type(dev);
753 pr_debug(" Type: %s ", scsi_device_type(device_type));
756 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
758 struct se_device *dev;
759 struct se_lun *xcopy_lun;
761 dev = hba->backend->ops->alloc_device(hba, name);
766 dev->transport = hba->backend->ops;
767 dev->prot_length = sizeof(struct t10_pi_tuple);
768 dev->hba_index = hba->hba_index;
770 INIT_LIST_HEAD(&dev->dev_list);
771 INIT_LIST_HEAD(&dev->dev_sep_list);
772 INIT_LIST_HEAD(&dev->dev_tmr_list);
773 INIT_LIST_HEAD(&dev->delayed_cmd_list);
774 INIT_LIST_HEAD(&dev->state_list);
775 INIT_LIST_HEAD(&dev->qf_cmd_list);
776 INIT_LIST_HEAD(&dev->g_dev_node);
777 spin_lock_init(&dev->execute_task_lock);
778 spin_lock_init(&dev->delayed_cmd_lock);
779 spin_lock_init(&dev->dev_reservation_lock);
780 spin_lock_init(&dev->se_port_lock);
781 spin_lock_init(&dev->se_tmr_lock);
782 spin_lock_init(&dev->qf_cmd_lock);
783 sema_init(&dev->caw_sem, 1);
784 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
785 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
786 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
787 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
788 spin_lock_init(&dev->t10_pr.registration_lock);
789 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
790 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
791 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
792 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
793 spin_lock_init(&dev->t10_alua.lba_map_lock);
795 dev->t10_wwn.t10_dev = dev;
796 dev->t10_alua.t10_dev = dev;
798 dev->dev_attrib.da_dev = dev;
799 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
800 dev->dev_attrib.emulate_dpo = 1;
801 dev->dev_attrib.emulate_fua_write = 1;
802 dev->dev_attrib.emulate_fua_read = 1;
803 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
804 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
805 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
806 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
807 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
808 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
809 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
810 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
811 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
812 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
813 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
814 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
815 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
816 dev->dev_attrib.max_unmap_block_desc_count =
817 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
818 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
819 dev->dev_attrib.unmap_granularity_alignment =
820 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
821 dev->dev_attrib.unmap_zeroes_data =
822 DA_UNMAP_ZEROES_DATA_DEFAULT;
823 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
825 xcopy_lun = &dev->xcopy_lun;
826 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
827 init_completion(&xcopy_lun->lun_ref_comp);
828 init_completion(&xcopy_lun->lun_shutdown_comp);
829 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
830 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
831 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
832 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
838 * Check if the underlying struct block_device request_queue supports
839 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
840 * in ATA and we need to set TPE=1
842 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
843 struct request_queue *q)
845 int block_size = queue_logical_block_size(q);
847 if (!blk_queue_discard(q))
850 attrib->max_unmap_lba_count =
851 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
853 * Currently hardcoded to 1 in Linux/SCSI code..
855 attrib->max_unmap_block_desc_count = 1;
856 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
857 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
859 attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
862 EXPORT_SYMBOL(target_configure_unmap_from_queue);
865 * Convert from blocksize advertised to the initiator to the 512 byte
866 * units unconditionally used by the Linux block layer.
868 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
870 switch (dev->dev_attrib.block_size) {
881 EXPORT_SYMBOL(target_to_linux_sector);
883 int target_configure_device(struct se_device *dev)
885 struct se_hba *hba = dev->se_hba;
888 if (dev->dev_flags & DF_CONFIGURED) {
889 pr_err("se_dev->se_dev_ptr already set for storage"
894 ret = dev->transport->configure_device(dev);
898 * XXX: there is not much point to have two different values here..
900 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
901 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
904 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
906 dev->dev_attrib.hw_max_sectors =
907 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
908 dev->dev_attrib.hw_block_size);
909 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
911 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
912 dev->creation_time = get_jiffies_64();
914 ret = core_setup_alua(dev);
919 * Startup the struct se_device processing thread
921 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
922 dev->transport->name);
924 pr_err("Unable to create tmr workqueue for %s\n",
925 dev->transport->name);
931 * Setup work_queue for QUEUE_FULL
933 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
936 * Preload the initial INQUIRY const values if we are doing
937 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
938 * passthrough because this is being provided by the backend LLD.
940 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
941 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
942 strncpy(&dev->t10_wwn.model[0],
943 dev->transport->inquiry_prod, 16);
944 strncpy(&dev->t10_wwn.revision[0],
945 dev->transport->inquiry_rev, 4);
948 scsi_dump_inquiry(dev);
950 spin_lock(&hba->device_lock);
952 spin_unlock(&hba->device_lock);
954 mutex_lock(&g_device_mutex);
955 list_add_tail(&dev->g_dev_node, &g_device_list);
956 mutex_unlock(&g_device_mutex);
958 dev->dev_flags |= DF_CONFIGURED;
963 core_alua_free_lu_gp_mem(dev);
965 se_release_vpd_for_dev(dev);
969 void target_free_device(struct se_device *dev)
971 struct se_hba *hba = dev->se_hba;
973 WARN_ON(!list_empty(&dev->dev_sep_list));
975 if (dev->dev_flags & DF_CONFIGURED) {
976 destroy_workqueue(dev->tmr_wq);
978 mutex_lock(&g_device_mutex);
979 list_del(&dev->g_dev_node);
980 mutex_unlock(&g_device_mutex);
982 spin_lock(&hba->device_lock);
984 spin_unlock(&hba->device_lock);
987 core_alua_free_lu_gp_mem(dev);
988 core_alua_set_lba_map(dev, NULL, 0, 0);
989 core_scsi3_free_all_registrations(dev);
990 se_release_vpd_for_dev(dev);
992 if (dev->transport->free_prot)
993 dev->transport->free_prot(dev);
995 dev->transport->free_device(dev);
998 int core_dev_setup_virtual_lun0(void)
1001 struct se_device *dev;
1002 char buf[] = "rd_pages=8,rd_nullio=1";
1005 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1007 return PTR_ERR(hba);
1009 dev = target_alloc_device(hba, "virt_lun0");
1015 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1017 ret = target_configure_device(dev);
1019 goto out_free_se_dev;
1026 target_free_device(dev);
1028 core_delete_hba(hba);
1033 void core_dev_release_virtual_lun0(void)
1035 struct se_hba *hba = lun0_hba;
1041 target_free_device(g_lun0_dev);
1042 core_delete_hba(hba);
1046 * Common CDB parsing for kernel and user passthrough.
1049 passthrough_parse_cdb(struct se_cmd *cmd,
1050 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1052 unsigned char *cdb = cmd->t_task_cdb;
1053 struct se_device *dev = cmd->se_dev;
1057 * Clear a lun set in the cdb if the initiator talking to use spoke
1058 * and old standards version, as we can't assume the underlying device
1059 * won't choke up on it.
1062 case READ_10: /* SBC - RDProtect */
1063 case READ_12: /* SBC - RDProtect */
1064 case READ_16: /* SBC - RDProtect */
1065 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1066 case VERIFY: /* SBC - VRProtect */
1067 case VERIFY_16: /* SBC - VRProtect */
1068 case WRITE_VERIFY: /* SBC - VRProtect */
1069 case WRITE_VERIFY_12: /* SBC - VRProtect */
1070 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1073 cdb[1] &= 0x1f; /* clear logical unit number */
1078 * For REPORT LUNS we always need to emulate the response, for everything
1081 if (cdb[0] == REPORT_LUNS) {
1082 cmd->execute_cmd = spc_emulate_report_luns;
1083 return TCM_NO_SENSE;
1087 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1088 * emulate the response, since tcmu does not have the information
1089 * required to process these commands.
1091 if (!(dev->transport->transport_flags &
1092 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1093 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1094 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1095 size = (cdb[7] << 8) + cdb[8];
1096 return target_cmd_size_check(cmd, size);
1098 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1099 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1100 size = (cdb[7] << 8) + cdb[8];
1101 return target_cmd_size_check(cmd, size);
1104 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1105 cmd->execute_cmd = target_scsi2_reservation_release;
1106 if (cdb[0] == RELEASE_10)
1107 size = (cdb[7] << 8) | cdb[8];
1109 size = cmd->data_length;
1110 return target_cmd_size_check(cmd, size);
1112 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1113 cmd->execute_cmd = target_scsi2_reservation_reserve;
1114 if (cdb[0] == RESERVE_10)
1115 size = (cdb[7] << 8) | cdb[8];
1117 size = cmd->data_length;
1118 return target_cmd_size_check(cmd, size);
1122 /* Set DATA_CDB flag for ops that should have it */
1133 case WRITE_VERIFY_12:
1134 case WRITE_VERIFY_16:
1135 case COMPARE_AND_WRITE:
1136 case XDWRITEREAD_10:
1137 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1139 case VARIABLE_LENGTH_CMD:
1140 switch (get_unaligned_be16(&cdb[8])) {
1143 case 0x0c: /* WRITE_VERIFY_32 */
1144 case XDWRITEREAD_32:
1145 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1150 cmd->execute_cmd = exec_cmd;
1152 return TCM_NO_SENSE;
1154 EXPORT_SYMBOL(passthrough_parse_cdb);