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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
39static DEFINE_MUTEX(device_mutex);
40static LIST_HEAD(device_list);
41static DEFINE_IDR(devices_idr);
42
43static struct se_hba *lun0_hba;
44/* not static, needed by tpg.c */
45struct se_device *g_lun0_dev;
46
47sense_reason_t
48transport_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 }
91out_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 */
131ref_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}
144EXPORT_SYMBOL(transport_lookup_cmd_lun);
145
146int 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 }
170out_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}
190EXPORT_SYMBOL(transport_lookup_tmr_lun);
191
192bool 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}
205EXPORT_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 */
212struct 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
242void 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
257void 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 */
274struct 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}
284EXPORT_SYMBOL(target_nacl_find_deve);
285
286void 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
293static void
294target_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
309int 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
393void 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 */
453void 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
476int 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 }
487again:
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
517static 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
530static 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
548int 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 */
588void 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
600struct 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
627int 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
666int 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
693void 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
706static 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
723struct 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 */
815bool 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}
835EXPORT_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 */
841sector_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}
854EXPORT_SYMBOL(target_to_linux_sector);
855
856struct devices_idr_iter {
857 struct config_item *prev_item;
858 int (*fn)(struct se_device *dev, void *data);
859 void *data;
860};
861
862static 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 */
900int 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
913int 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
979out_destroy_device:
980 dev->transport->destroy_device(dev);
981out_free_index:
982 mutex_lock(&device_mutex);
983 idr_remove(&devices_idr, dev->dev_index);
984 mutex_unlock(&device_mutex);
985out:
986 se_release_vpd_for_dev(dev);
987 return ret;
988}
989
990void 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
1019int 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
1046out_free_se_dev:
1047 target_free_device(dev);
1048out_free_hba:
1049 core_delete_hba(hba);
1050 return ret;
1051}
1052
1053
1054void 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 */
1069sense_reason_t
1070passthrough_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}
1166EXPORT_SYMBOL(passthrough_parse_cdb);
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 <linux/t10-pi.h>
37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi_common.h>
41#include <scsi/scsi_proto.h>
42
43#include <target/target_core_base.h>
44#include <target/target_core_backend.h>
45#include <target/target_core_fabric.h>
46
47#include "target_core_internal.h"
48#include "target_core_alua.h"
49#include "target_core_pr.h"
50#include "target_core_ua.h"
51
52DEFINE_MUTEX(g_device_mutex);
53LIST_HEAD(g_device_list);
54
55static struct se_hba *lun0_hba;
56/* not static, needed by tpg.c */
57struct se_device *g_lun0_dev;
58
59sense_reason_t
60transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
61{
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;
67
68 rcu_read_lock();
69 deve = target_nacl_find_deve(nacl, unpacked_lun);
70 if (deve) {
71 atomic_long_inc(&deve->total_cmds);
72
73 if (se_cmd->data_direction == DMA_TO_DEVICE)
74 atomic_long_add(se_cmd->data_length,
75 &deve->write_bytes);
76 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
77 atomic_long_add(se_cmd->data_length,
78 &deve->read_bytes);
79
80 se_lun = rcu_dereference(deve->se_lun);
81
82 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
83 se_lun = NULL;
84 goto out_unlock;
85 }
86
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;
92
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(),
98 unpacked_lun);
99 rcu_read_unlock();
100 ret = TCM_WRITE_PROTECTED;
101 goto ref_dev;
102 }
103 }
104out_unlock:
105 rcu_read_unlock();
106
107 if (!se_lun) {
108 /*
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.
112 */
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(),
117 unpacked_lun);
118 return TCM_NON_EXISTENT_LUN;
119 }
120
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;
125
126 percpu_ref_get(&se_lun->lun_ref);
127 se_cmd->lun_ref_active = true;
128
129 /*
130 * Force WRITE PROTECT for virtual LUN 0
131 */
132 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
133 (se_cmd->data_direction != DMA_NONE)) {
134 ret = TCM_WRITE_PROTECTED;
135 goto ref_dev;
136 }
137 }
138 /*
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
143 */
144ref_dev:
145 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
146 atomic_long_inc(&se_cmd->se_dev->num_cmds);
147
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);
154
155 return ret;
156}
157EXPORT_SYMBOL(transport_lookup_cmd_lun);
158
159int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
160{
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;
166 unsigned long flags;
167
168 rcu_read_lock();
169 deve = target_nacl_find_deve(nacl, unpacked_lun);
170 if (deve) {
171 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
172 se_cmd->se_lun = rcu_dereference(deve->se_lun);
173 se_lun = rcu_dereference(deve->se_lun);
174 se_cmd->pr_res_key = deve->pr_res_key;
175 se_cmd->orig_fe_lun = unpacked_lun;
176 }
177 rcu_read_unlock();
178
179 if (!se_lun) {
180 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
181 " Access for 0x%08llx\n",
182 se_cmd->se_tfo->get_fabric_name(),
183 unpacked_lun);
184 return -ENODEV;
185 }
186 /*
187 * XXX: Add percpu se_lun->lun_ref reference count for TMR
188 */
189 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
190 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
191
192 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
193 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
194 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
195
196 return 0;
197}
198EXPORT_SYMBOL(transport_lookup_tmr_lun);
199
200bool target_lun_is_rdonly(struct se_cmd *cmd)
201{
202 struct se_session *se_sess = cmd->se_sess;
203 struct se_dev_entry *deve;
204 bool ret;
205
206 rcu_read_lock();
207 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
208 ret = deve && deve->lun_access_ro;
209 rcu_read_unlock();
210
211 return ret;
212}
213EXPORT_SYMBOL(target_lun_is_rdonly);
214
215/*
216 * This function is called from core_scsi3_emulate_pro_register_and_move()
217 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
218 * when a matching rtpi is found.
219 */
220struct se_dev_entry *core_get_se_deve_from_rtpi(
221 struct se_node_acl *nacl,
222 u16 rtpi)
223{
224 struct se_dev_entry *deve;
225 struct se_lun *lun;
226 struct se_portal_group *tpg = nacl->se_tpg;
227
228 rcu_read_lock();
229 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
230 lun = rcu_dereference(deve->se_lun);
231 if (!lun) {
232 pr_err("%s device entries device pointer is"
233 " NULL, but Initiator has access.\n",
234 tpg->se_tpg_tfo->get_fabric_name());
235 continue;
236 }
237 if (lun->lun_rtpi != rtpi)
238 continue;
239
240 kref_get(&deve->pr_kref);
241 rcu_read_unlock();
242
243 return deve;
244 }
245 rcu_read_unlock();
246
247 return NULL;
248}
249
250void core_free_device_list_for_node(
251 struct se_node_acl *nacl,
252 struct se_portal_group *tpg)
253{
254 struct se_dev_entry *deve;
255
256 mutex_lock(&nacl->lun_entry_mutex);
257 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
258 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
259 lockdep_is_held(&nacl->lun_entry_mutex));
260 core_disable_device_list_for_node(lun, deve, nacl, tpg);
261 }
262 mutex_unlock(&nacl->lun_entry_mutex);
263}
264
265void core_update_device_list_access(
266 u64 mapped_lun,
267 bool lun_access_ro,
268 struct se_node_acl *nacl)
269{
270 struct se_dev_entry *deve;
271
272 mutex_lock(&nacl->lun_entry_mutex);
273 deve = target_nacl_find_deve(nacl, mapped_lun);
274 if (deve)
275 deve->lun_access_ro = lun_access_ro;
276 mutex_unlock(&nacl->lun_entry_mutex);
277}
278
279/*
280 * Called with rcu_read_lock or nacl->device_list_lock held.
281 */
282struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
283{
284 struct se_dev_entry *deve;
285
286 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
287 if (deve->mapped_lun == mapped_lun)
288 return deve;
289
290 return NULL;
291}
292EXPORT_SYMBOL(target_nacl_find_deve);
293
294void target_pr_kref_release(struct kref *kref)
295{
296 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
297 pr_kref);
298 complete(&deve->pr_comp);
299}
300
301static void
302target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
303 bool skip_new)
304{
305 struct se_dev_entry *tmp;
306
307 rcu_read_lock();
308 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
309 if (skip_new && tmp == new)
310 continue;
311 core_scsi3_ua_allocate(tmp, 0x3F,
312 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
313 }
314 rcu_read_unlock();
315}
316
317int core_enable_device_list_for_node(
318 struct se_lun *lun,
319 struct se_lun_acl *lun_acl,
320 u64 mapped_lun,
321 bool lun_access_ro,
322 struct se_node_acl *nacl,
323 struct se_portal_group *tpg)
324{
325 struct se_dev_entry *orig, *new;
326
327 new = kzalloc(sizeof(*new), GFP_KERNEL);
328 if (!new) {
329 pr_err("Unable to allocate se_dev_entry memory\n");
330 return -ENOMEM;
331 }
332
333 atomic_set(&new->ua_count, 0);
334 spin_lock_init(&new->ua_lock);
335 INIT_LIST_HEAD(&new->ua_list);
336 INIT_LIST_HEAD(&new->lun_link);
337
338 new->mapped_lun = mapped_lun;
339 kref_init(&new->pr_kref);
340 init_completion(&new->pr_comp);
341
342 new->lun_access_ro = lun_access_ro;
343 new->creation_time = get_jiffies_64();
344 new->attach_count++;
345
346 mutex_lock(&nacl->lun_entry_mutex);
347 orig = target_nacl_find_deve(nacl, mapped_lun);
348 if (orig && orig->se_lun) {
349 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
350 lockdep_is_held(&nacl->lun_entry_mutex));
351
352 if (orig_lun != lun) {
353 pr_err("Existing orig->se_lun doesn't match new lun"
354 " for dynamic -> explicit NodeACL conversion:"
355 " %s\n", nacl->initiatorname);
356 mutex_unlock(&nacl->lun_entry_mutex);
357 kfree(new);
358 return -EINVAL;
359 }
360 if (orig->se_lun_acl != NULL) {
361 pr_warn_ratelimited("Detected existing explicit"
362 " se_lun_acl->se_lun_group reference for %s"
363 " mapped_lun: %llu, failing\n",
364 nacl->initiatorname, mapped_lun);
365 mutex_unlock(&nacl->lun_entry_mutex);
366 kfree(new);
367 return -EINVAL;
368 }
369
370 rcu_assign_pointer(new->se_lun, lun);
371 rcu_assign_pointer(new->se_lun_acl, lun_acl);
372 hlist_del_rcu(&orig->link);
373 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
374 mutex_unlock(&nacl->lun_entry_mutex);
375
376 spin_lock(&lun->lun_deve_lock);
377 list_del(&orig->lun_link);
378 list_add_tail(&new->lun_link, &lun->lun_deve_list);
379 spin_unlock(&lun->lun_deve_lock);
380
381 kref_put(&orig->pr_kref, target_pr_kref_release);
382 wait_for_completion(&orig->pr_comp);
383
384 target_luns_data_has_changed(nacl, new, true);
385 kfree_rcu(orig, rcu_head);
386 return 0;
387 }
388
389 rcu_assign_pointer(new->se_lun, lun);
390 rcu_assign_pointer(new->se_lun_acl, lun_acl);
391 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
392 mutex_unlock(&nacl->lun_entry_mutex);
393
394 spin_lock(&lun->lun_deve_lock);
395 list_add_tail(&new->lun_link, &lun->lun_deve_list);
396 spin_unlock(&lun->lun_deve_lock);
397
398 target_luns_data_has_changed(nacl, new, true);
399 return 0;
400}
401
402/*
403 * Called with se_node_acl->lun_entry_mutex held.
404 */
405void core_disable_device_list_for_node(
406 struct se_lun *lun,
407 struct se_dev_entry *orig,
408 struct se_node_acl *nacl,
409 struct se_portal_group *tpg)
410{
411 /*
412 * rcu_dereference_raw protected by se_lun->lun_group symlink
413 * reference to se_device->dev_group.
414 */
415 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
416 /*
417 * If the MappedLUN entry is being disabled, the entry in
418 * lun->lun_deve_list must be removed now before clearing the
419 * struct se_dev_entry pointers below as logic in
420 * core_alua_do_transition_tg_pt() depends on these being present.
421 *
422 * deve->se_lun_acl will be NULL for demo-mode created LUNs
423 * that have not been explicitly converted to MappedLUNs ->
424 * struct se_lun_acl, but we remove deve->lun_link from
425 * lun->lun_deve_list. This also means that active UAs and
426 * NodeACL context specific PR metadata for demo-mode
427 * MappedLUN *deve will be released below..
428 */
429 spin_lock(&lun->lun_deve_lock);
430 list_del(&orig->lun_link);
431 spin_unlock(&lun->lun_deve_lock);
432 /*
433 * Disable struct se_dev_entry LUN ACL mapping
434 */
435 core_scsi3_ua_release_all(orig);
436
437 hlist_del_rcu(&orig->link);
438 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
439 orig->lun_access_ro = false;
440 orig->creation_time = 0;
441 orig->attach_count--;
442 /*
443 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
444 * or REGISTER_AND_MOVE PR operation to complete.
445 */
446 kref_put(&orig->pr_kref, target_pr_kref_release);
447 wait_for_completion(&orig->pr_comp);
448
449 rcu_assign_pointer(orig->se_lun, NULL);
450 rcu_assign_pointer(orig->se_lun_acl, NULL);
451
452 kfree_rcu(orig, rcu_head);
453
454 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
455 target_luns_data_has_changed(nacl, NULL, false);
456}
457
458/* core_clear_lun_from_tpg():
459 *
460 *
461 */
462void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
463{
464 struct se_node_acl *nacl;
465 struct se_dev_entry *deve;
466
467 mutex_lock(&tpg->acl_node_mutex);
468 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469
470 mutex_lock(&nacl->lun_entry_mutex);
471 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
472 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
473 lockdep_is_held(&nacl->lun_entry_mutex));
474
475 if (lun != tmp_lun)
476 continue;
477
478 core_disable_device_list_for_node(lun, deve, nacl, tpg);
479 }
480 mutex_unlock(&nacl->lun_entry_mutex);
481 }
482 mutex_unlock(&tpg->acl_node_mutex);
483}
484
485int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
486{
487 struct se_lun *tmp;
488
489 spin_lock(&dev->se_port_lock);
490 if (dev->export_count == 0x0000ffff) {
491 pr_warn("Reached dev->dev_port_count =="
492 " 0x0000ffff\n");
493 spin_unlock(&dev->se_port_lock);
494 return -ENOSPC;
495 }
496again:
497 /*
498 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
499 * Here is the table from spc4r17 section 7.7.3.8.
500 *
501 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
502 *
503 * Code Description
504 * 0h Reserved
505 * 1h Relative port 1, historically known as port A
506 * 2h Relative port 2, historically known as port B
507 * 3h to FFFFh Relative port 3 through 65 535
508 */
509 lun->lun_rtpi = dev->dev_rpti_counter++;
510 if (!lun->lun_rtpi)
511 goto again;
512
513 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
514 /*
515 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
516 * for 16-bit wrap..
517 */
518 if (lun->lun_rtpi == tmp->lun_rtpi)
519 goto again;
520 }
521 spin_unlock(&dev->se_port_lock);
522
523 return 0;
524}
525
526static void se_release_vpd_for_dev(struct se_device *dev)
527{
528 struct t10_vpd *vpd, *vpd_tmp;
529
530 spin_lock(&dev->t10_wwn.t10_vpd_lock);
531 list_for_each_entry_safe(vpd, vpd_tmp,
532 &dev->t10_wwn.t10_vpd_list, vpd_list) {
533 list_del(&vpd->vpd_list);
534 kfree(vpd);
535 }
536 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
537}
538
539static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
540{
541 u32 aligned_max_sectors;
542 u32 alignment;
543 /*
544 * Limit max_sectors to a PAGE_SIZE aligned value for modern
545 * transport_allocate_data_tasks() operation.
546 */
547 alignment = max(1ul, PAGE_SIZE / block_size);
548 aligned_max_sectors = rounddown(max_sectors, alignment);
549
550 if (max_sectors != aligned_max_sectors)
551 pr_info("Rounding down aligned max_sectors from %u to %u\n",
552 max_sectors, aligned_max_sectors);
553
554 return aligned_max_sectors;
555}
556
557int core_dev_add_lun(
558 struct se_portal_group *tpg,
559 struct se_device *dev,
560 struct se_lun *lun)
561{
562 int rc;
563
564 rc = core_tpg_add_lun(tpg, lun, false, dev);
565 if (rc < 0)
566 return rc;
567
568 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
569 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
570 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
571 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
572 /*
573 * Update LUN maps for dynamically added initiators when
574 * generate_node_acl is enabled.
575 */
576 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
577 struct se_node_acl *acl;
578
579 mutex_lock(&tpg->acl_node_mutex);
580 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
581 if (acl->dynamic_node_acl &&
582 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
583 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
584 core_tpg_add_node_to_devs(acl, tpg, lun);
585 }
586 }
587 mutex_unlock(&tpg->acl_node_mutex);
588 }
589
590 return 0;
591}
592
593/* core_dev_del_lun():
594 *
595 *
596 */
597void core_dev_del_lun(
598 struct se_portal_group *tpg,
599 struct se_lun *lun)
600{
601 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
602 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
603 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
604 tpg->se_tpg_tfo->get_fabric_name());
605
606 core_tpg_remove_lun(tpg, lun);
607}
608
609struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
610 struct se_portal_group *tpg,
611 struct se_node_acl *nacl,
612 u64 mapped_lun,
613 int *ret)
614{
615 struct se_lun_acl *lacl;
616
617 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
618 pr_err("%s InitiatorName exceeds maximum size.\n",
619 tpg->se_tpg_tfo->get_fabric_name());
620 *ret = -EOVERFLOW;
621 return NULL;
622 }
623 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
624 if (!lacl) {
625 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
626 *ret = -ENOMEM;
627 return NULL;
628 }
629
630 lacl->mapped_lun = mapped_lun;
631 lacl->se_lun_nacl = nacl;
632
633 return lacl;
634}
635
636int core_dev_add_initiator_node_lun_acl(
637 struct se_portal_group *tpg,
638 struct se_lun_acl *lacl,
639 struct se_lun *lun,
640 bool lun_access_ro)
641{
642 struct se_node_acl *nacl = lacl->se_lun_nacl;
643 /*
644 * rcu_dereference_raw protected by se_lun->lun_group symlink
645 * reference to se_device->dev_group.
646 */
647 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
648
649 if (!nacl)
650 return -EINVAL;
651
652 if (lun->lun_access_ro)
653 lun_access_ro = true;
654
655 lacl->se_lun = lun;
656
657 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
658 lun_access_ro, nacl, tpg) < 0)
659 return -EINVAL;
660
661 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
662 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
663 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
664 lun_access_ro ? "RO" : "RW",
665 nacl->initiatorname);
666 /*
667 * Check to see if there are any existing persistent reservation APTPL
668 * pre-registrations that need to be enabled for this LUN ACL..
669 */
670 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
671 lacl->mapped_lun);
672 return 0;
673}
674
675int core_dev_del_initiator_node_lun_acl(
676 struct se_lun *lun,
677 struct se_lun_acl *lacl)
678{
679 struct se_portal_group *tpg = lun->lun_tpg;
680 struct se_node_acl *nacl;
681 struct se_dev_entry *deve;
682
683 nacl = lacl->se_lun_nacl;
684 if (!nacl)
685 return -EINVAL;
686
687 mutex_lock(&nacl->lun_entry_mutex);
688 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
689 if (deve)
690 core_disable_device_list_for_node(lun, deve, nacl, tpg);
691 mutex_unlock(&nacl->lun_entry_mutex);
692
693 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
694 " InitiatorNode: %s Mapped LUN: %llu\n",
695 tpg->se_tpg_tfo->get_fabric_name(),
696 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
697 nacl->initiatorname, lacl->mapped_lun);
698
699 return 0;
700}
701
702void core_dev_free_initiator_node_lun_acl(
703 struct se_portal_group *tpg,
704 struct se_lun_acl *lacl)
705{
706 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
707 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
708 tpg->se_tpg_tfo->tpg_get_tag(tpg),
709 tpg->se_tpg_tfo->get_fabric_name(),
710 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
711
712 kfree(lacl);
713}
714
715static void scsi_dump_inquiry(struct se_device *dev)
716{
717 struct t10_wwn *wwn = &dev->t10_wwn;
718 char buf[17];
719 int i, device_type;
720 /*
721 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
722 */
723 for (i = 0; i < 8; i++)
724 if (wwn->vendor[i] >= 0x20)
725 buf[i] = wwn->vendor[i];
726 else
727 buf[i] = ' ';
728 buf[i] = '\0';
729 pr_debug(" Vendor: %s\n", buf);
730
731 for (i = 0; i < 16; i++)
732 if (wwn->model[i] >= 0x20)
733 buf[i] = wwn->model[i];
734 else
735 buf[i] = ' ';
736 buf[i] = '\0';
737 pr_debug(" Model: %s\n", buf);
738
739 for (i = 0; i < 4; i++)
740 if (wwn->revision[i] >= 0x20)
741 buf[i] = wwn->revision[i];
742 else
743 buf[i] = ' ';
744 buf[i] = '\0';
745 pr_debug(" Revision: %s\n", buf);
746
747 device_type = dev->transport->get_device_type(dev);
748 pr_debug(" Type: %s ", scsi_device_type(device_type));
749}
750
751struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
752{
753 struct se_device *dev;
754 struct se_lun *xcopy_lun;
755
756 dev = hba->backend->ops->alloc_device(hba, name);
757 if (!dev)
758 return NULL;
759
760 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
761 dev->se_hba = hba;
762 dev->transport = hba->backend->ops;
763 dev->prot_length = sizeof(struct t10_pi_tuple);
764 dev->hba_index = hba->hba_index;
765
766 INIT_LIST_HEAD(&dev->dev_list);
767 INIT_LIST_HEAD(&dev->dev_sep_list);
768 INIT_LIST_HEAD(&dev->dev_tmr_list);
769 INIT_LIST_HEAD(&dev->delayed_cmd_list);
770 INIT_LIST_HEAD(&dev->state_list);
771 INIT_LIST_HEAD(&dev->qf_cmd_list);
772 INIT_LIST_HEAD(&dev->g_dev_node);
773 spin_lock_init(&dev->execute_task_lock);
774 spin_lock_init(&dev->delayed_cmd_lock);
775 spin_lock_init(&dev->dev_reservation_lock);
776 spin_lock_init(&dev->se_port_lock);
777 spin_lock_init(&dev->se_tmr_lock);
778 spin_lock_init(&dev->qf_cmd_lock);
779 sema_init(&dev->caw_sem, 1);
780 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
781 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
782 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
783 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
784 spin_lock_init(&dev->t10_pr.registration_lock);
785 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
786 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
787 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
788 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
789 spin_lock_init(&dev->t10_alua.lba_map_lock);
790
791 dev->t10_wwn.t10_dev = dev;
792 dev->t10_alua.t10_dev = dev;
793
794 dev->dev_attrib.da_dev = dev;
795 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
796 dev->dev_attrib.emulate_dpo = 1;
797 dev->dev_attrib.emulate_fua_write = 1;
798 dev->dev_attrib.emulate_fua_read = 1;
799 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
800 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
801 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
802 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
803 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
804 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
805 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
806 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
807 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
808 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
809 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
810 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
811 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
812 dev->dev_attrib.max_unmap_block_desc_count =
813 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
814 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
815 dev->dev_attrib.unmap_granularity_alignment =
816 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
817 dev->dev_attrib.unmap_zeroes_data =
818 DA_UNMAP_ZEROES_DATA_DEFAULT;
819 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
820
821 xcopy_lun = &dev->xcopy_lun;
822 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
823 init_completion(&xcopy_lun->lun_ref_comp);
824 init_completion(&xcopy_lun->lun_shutdown_comp);
825 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
826 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
827 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
828 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
829
830 return dev;
831}
832
833/*
834 * Check if the underlying struct block_device request_queue supports
835 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
836 * in ATA and we need to set TPE=1
837 */
838bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
839 struct request_queue *q)
840{
841 int block_size = queue_logical_block_size(q);
842
843 if (!blk_queue_discard(q))
844 return false;
845
846 attrib->max_unmap_lba_count =
847 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
848 /*
849 * Currently hardcoded to 1 in Linux/SCSI code..
850 */
851 attrib->max_unmap_block_desc_count = 1;
852 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
853 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
854 block_size;
855 attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
856 return true;
857}
858EXPORT_SYMBOL(target_configure_unmap_from_queue);
859
860/*
861 * Convert from blocksize advertised to the initiator to the 512 byte
862 * units unconditionally used by the Linux block layer.
863 */
864sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
865{
866 switch (dev->dev_attrib.block_size) {
867 case 4096:
868 return lb << 3;
869 case 2048:
870 return lb << 2;
871 case 1024:
872 return lb << 1;
873 default:
874 return lb;
875 }
876}
877EXPORT_SYMBOL(target_to_linux_sector);
878
879int target_configure_device(struct se_device *dev)
880{
881 struct se_hba *hba = dev->se_hba;
882 int ret;
883
884 if (dev->dev_flags & DF_CONFIGURED) {
885 pr_err("se_dev->se_dev_ptr already set for storage"
886 " object\n");
887 return -EEXIST;
888 }
889
890 ret = dev->transport->configure_device(dev);
891 if (ret)
892 goto out;
893 /*
894 * XXX: there is not much point to have two different values here..
895 */
896 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
897 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
898
899 /*
900 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
901 */
902 dev->dev_attrib.hw_max_sectors =
903 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
904 dev->dev_attrib.hw_block_size);
905 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
906
907 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
908 dev->creation_time = get_jiffies_64();
909
910 ret = core_setup_alua(dev);
911 if (ret)
912 goto out;
913
914 /*
915 * Startup the struct se_device processing thread
916 */
917 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
918 dev->transport->name);
919 if (!dev->tmr_wq) {
920 pr_err("Unable to create tmr workqueue for %s\n",
921 dev->transport->name);
922 ret = -ENOMEM;
923 goto out_free_alua;
924 }
925
926 /*
927 * Setup work_queue for QUEUE_FULL
928 */
929 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
930
931 /*
932 * Preload the initial INQUIRY const values if we are doing
933 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
934 * passthrough because this is being provided by the backend LLD.
935 */
936 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
937 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
938 strncpy(&dev->t10_wwn.model[0],
939 dev->transport->inquiry_prod, 16);
940 strncpy(&dev->t10_wwn.revision[0],
941 dev->transport->inquiry_rev, 4);
942 }
943
944 scsi_dump_inquiry(dev);
945
946 spin_lock(&hba->device_lock);
947 hba->dev_count++;
948 spin_unlock(&hba->device_lock);
949
950 mutex_lock(&g_device_mutex);
951 list_add_tail(&dev->g_dev_node, &g_device_list);
952 mutex_unlock(&g_device_mutex);
953
954 dev->dev_flags |= DF_CONFIGURED;
955
956 return 0;
957
958out_free_alua:
959 core_alua_free_lu_gp_mem(dev);
960out:
961 se_release_vpd_for_dev(dev);
962 return ret;
963}
964
965void target_free_device(struct se_device *dev)
966{
967 struct se_hba *hba = dev->se_hba;
968
969 WARN_ON(!list_empty(&dev->dev_sep_list));
970
971 if (dev->dev_flags & DF_CONFIGURED) {
972 destroy_workqueue(dev->tmr_wq);
973
974 mutex_lock(&g_device_mutex);
975 list_del(&dev->g_dev_node);
976 mutex_unlock(&g_device_mutex);
977
978 spin_lock(&hba->device_lock);
979 hba->dev_count--;
980 spin_unlock(&hba->device_lock);
981 }
982
983 core_alua_free_lu_gp_mem(dev);
984 core_alua_set_lba_map(dev, NULL, 0, 0);
985 core_scsi3_free_all_registrations(dev);
986 se_release_vpd_for_dev(dev);
987
988 if (dev->transport->free_prot)
989 dev->transport->free_prot(dev);
990
991 dev->transport->free_device(dev);
992}
993
994int core_dev_setup_virtual_lun0(void)
995{
996 struct se_hba *hba;
997 struct se_device *dev;
998 char buf[] = "rd_pages=8,rd_nullio=1";
999 int ret;
1000
1001 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1002 if (IS_ERR(hba))
1003 return PTR_ERR(hba);
1004
1005 dev = target_alloc_device(hba, "virt_lun0");
1006 if (!dev) {
1007 ret = -ENOMEM;
1008 goto out_free_hba;
1009 }
1010
1011 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1012
1013 ret = target_configure_device(dev);
1014 if (ret)
1015 goto out_free_se_dev;
1016
1017 lun0_hba = hba;
1018 g_lun0_dev = dev;
1019 return 0;
1020
1021out_free_se_dev:
1022 target_free_device(dev);
1023out_free_hba:
1024 core_delete_hba(hba);
1025 return ret;
1026}
1027
1028
1029void core_dev_release_virtual_lun0(void)
1030{
1031 struct se_hba *hba = lun0_hba;
1032
1033 if (!hba)
1034 return;
1035
1036 if (g_lun0_dev)
1037 target_free_device(g_lun0_dev);
1038 core_delete_hba(hba);
1039}
1040
1041/*
1042 * Common CDB parsing for kernel and user passthrough.
1043 */
1044sense_reason_t
1045passthrough_parse_cdb(struct se_cmd *cmd,
1046 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1047{
1048 unsigned char *cdb = cmd->t_task_cdb;
1049
1050 /*
1051 * Clear a lun set in the cdb if the initiator talking to use spoke
1052 * and old standards version, as we can't assume the underlying device
1053 * won't choke up on it.
1054 */
1055 switch (cdb[0]) {
1056 case READ_10: /* SBC - RDProtect */
1057 case READ_12: /* SBC - RDProtect */
1058 case READ_16: /* SBC - RDProtect */
1059 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1060 case VERIFY: /* SBC - VRProtect */
1061 case VERIFY_16: /* SBC - VRProtect */
1062 case WRITE_VERIFY: /* SBC - VRProtect */
1063 case WRITE_VERIFY_12: /* SBC - VRProtect */
1064 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1065 break;
1066 default:
1067 cdb[1] &= 0x1f; /* clear logical unit number */
1068 break;
1069 }
1070
1071 /*
1072 * For REPORT LUNS we always need to emulate the response, for everything
1073 * else, pass it up.
1074 */
1075 if (cdb[0] == REPORT_LUNS) {
1076 cmd->execute_cmd = spc_emulate_report_luns;
1077 return TCM_NO_SENSE;
1078 }
1079
1080 /* Set DATA_CDB flag for ops that should have it */
1081 switch (cdb[0]) {
1082 case READ_6:
1083 case READ_10:
1084 case READ_12:
1085 case READ_16:
1086 case WRITE_6:
1087 case WRITE_10:
1088 case WRITE_12:
1089 case WRITE_16:
1090 case WRITE_VERIFY:
1091 case WRITE_VERIFY_12:
1092 case 0x8e: /* WRITE_VERIFY_16 */
1093 case COMPARE_AND_WRITE:
1094 case XDWRITEREAD_10:
1095 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1096 break;
1097 case VARIABLE_LENGTH_CMD:
1098 switch (get_unaligned_be16(&cdb[8])) {
1099 case READ_32:
1100 case WRITE_32:
1101 case 0x0c: /* WRITE_VERIFY_32 */
1102 case XDWRITEREAD_32:
1103 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1104 break;
1105 }
1106 }
1107
1108 cmd->execute_cmd = exec_cmd;
1109
1110 return TCM_NO_SENSE;
1111}
1112EXPORT_SYMBOL(passthrough_parse_cdb);