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 <linux/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 DEFINE_IDR(devices_idr);
41
42static struct se_hba *lun0_hba;
43/* not static, needed by tpg.c */
44struct se_device *g_lun0_dev;
45
46sense_reason_t
47transport_lookup_cmd_lun(struct se_cmd *se_cmd)
48{
49 struct se_lun *se_lun = NULL;
50 struct se_session *se_sess = se_cmd->se_sess;
51 struct se_node_acl *nacl = se_sess->se_node_acl;
52 struct se_dev_entry *deve;
53 sense_reason_t ret = TCM_NO_SENSE;
54
55 rcu_read_lock();
56 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
57 if (deve) {
58 this_cpu_inc(deve->stats->total_cmds);
59
60 if (se_cmd->data_direction == DMA_TO_DEVICE)
61 this_cpu_add(deve->stats->write_bytes,
62 se_cmd->data_length);
63 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
64 this_cpu_add(deve->stats->read_bytes,
65 se_cmd->data_length);
66
67 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
68 deve->lun_access_ro) {
69 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
70 " Access for 0x%08llx\n",
71 se_cmd->se_tfo->fabric_name,
72 se_cmd->orig_fe_lun);
73 rcu_read_unlock();
74 return TCM_WRITE_PROTECTED;
75 }
76
77 se_lun = deve->se_lun;
78
79 if (!percpu_ref_tryget_live(ref: &se_lun->lun_ref)) {
80 se_lun = NULL;
81 goto out_unlock;
82 }
83
84 se_cmd->se_lun = se_lun;
85 se_cmd->pr_res_key = deve->pr_res_key;
86 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
87 se_cmd->lun_ref_active = true;
88 }
89out_unlock:
90 rcu_read_unlock();
91
92 if (!se_lun) {
93 /*
94 * Use the se_portal_group->tpg_virt_lun0 to allow for
95 * REPORT_LUNS, et al to be returned when no active
96 * MappedLUN=0 exists for this Initiator Port.
97 */
98 if (se_cmd->orig_fe_lun != 0) {
99 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
100 " Access for 0x%08llx from %s\n",
101 se_cmd->se_tfo->fabric_name,
102 se_cmd->orig_fe_lun,
103 nacl->initiatorname);
104 return TCM_NON_EXISTENT_LUN;
105 }
106
107 /*
108 * Force WRITE PROTECT for virtual LUN 0
109 */
110 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
111 (se_cmd->data_direction != DMA_NONE))
112 return TCM_WRITE_PROTECTED;
113
114 se_lun = se_sess->se_tpg->tpg_virt_lun0;
115 if (!percpu_ref_tryget_live(ref: &se_lun->lun_ref))
116 return TCM_NON_EXISTENT_LUN;
117
118 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
119 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
120 se_cmd->lun_ref_active = true;
121 }
122 /*
123 * RCU reference protected by percpu se_lun->lun_ref taken above that
124 * must drop to zero (including initial reference) before this se_lun
125 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
126 * target_core_fabric_configfs.c:target_fabric_port_release
127 */
128 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
129 this_cpu_inc(se_cmd->se_dev->stats->total_cmds);
130
131 if (se_cmd->data_direction == DMA_TO_DEVICE)
132 this_cpu_add(se_cmd->se_dev->stats->write_bytes,
133 se_cmd->data_length);
134 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
135 this_cpu_add(se_cmd->se_dev->stats->read_bytes,
136 se_cmd->data_length);
137
138 return ret;
139}
140EXPORT_SYMBOL(transport_lookup_cmd_lun);
141
142int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
143{
144 struct se_dev_entry *deve;
145 struct se_lun *se_lun = NULL;
146 struct se_session *se_sess = se_cmd->se_sess;
147 struct se_node_acl *nacl = se_sess->se_node_acl;
148 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
149
150 rcu_read_lock();
151 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
152 if (deve) {
153 se_lun = deve->se_lun;
154
155 if (!percpu_ref_tryget_live(ref: &se_lun->lun_ref)) {
156 se_lun = NULL;
157 goto out_unlock;
158 }
159
160 se_cmd->se_lun = se_lun;
161 se_cmd->pr_res_key = deve->pr_res_key;
162 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
163 se_cmd->lun_ref_active = true;
164 }
165out_unlock:
166 rcu_read_unlock();
167
168 if (!se_lun) {
169 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
170 " Access for 0x%08llx for %s\n",
171 se_cmd->se_tfo->fabric_name,
172 se_cmd->orig_fe_lun,
173 nacl->initiatorname);
174 return -ENODEV;
175 }
176 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
177 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
178
179 return 0;
180}
181EXPORT_SYMBOL(transport_lookup_tmr_lun);
182
183bool target_lun_is_rdonly(struct se_cmd *cmd)
184{
185 struct se_session *se_sess = cmd->se_sess;
186 struct se_dev_entry *deve;
187 bool ret;
188
189 rcu_read_lock();
190 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
191 ret = deve && deve->lun_access_ro;
192 rcu_read_unlock();
193
194 return ret;
195}
196EXPORT_SYMBOL(target_lun_is_rdonly);
197
198/*
199 * This function is called from core_scsi3_emulate_pro_register_and_move()
200 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
201 * when a matching rtpi is found.
202 */
203struct se_dev_entry *core_get_se_deve_from_rtpi(
204 struct se_node_acl *nacl,
205 u16 rtpi)
206{
207 struct se_dev_entry *deve;
208 struct se_lun *lun;
209 struct se_portal_group *tpg = nacl->se_tpg;
210
211 rcu_read_lock();
212 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
213 lun = deve->se_lun;
214 if (!lun) {
215 pr_err("%s device entries device pointer is"
216 " NULL, but Initiator has access.\n",
217 tpg->se_tpg_tfo->fabric_name);
218 continue;
219 }
220 if (lun->lun_tpg->tpg_rtpi != rtpi)
221 continue;
222
223 kref_get(kref: &deve->pr_kref);
224 rcu_read_unlock();
225
226 return deve;
227 }
228 rcu_read_unlock();
229
230 return NULL;
231}
232
233void core_free_device_list_for_node(
234 struct se_node_acl *nacl,
235 struct se_portal_group *tpg)
236{
237 struct se_dev_entry *deve;
238
239 mutex_lock(&nacl->lun_entry_mutex);
240 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
241 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
242 mutex_unlock(lock: &nacl->lun_entry_mutex);
243}
244
245void core_update_device_list_access(
246 u64 mapped_lun,
247 bool lun_access_ro,
248 struct se_node_acl *nacl)
249{
250 struct se_dev_entry *deve;
251
252 mutex_lock(&nacl->lun_entry_mutex);
253 deve = target_nacl_find_deve(nacl, mapped_lun);
254 if (deve)
255 deve->lun_access_ro = lun_access_ro;
256 mutex_unlock(lock: &nacl->lun_entry_mutex);
257}
258
259/*
260 * Called with rcu_read_lock or nacl->device_list_lock held.
261 */
262struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
263{
264 struct se_dev_entry *deve;
265
266 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
267 if (deve->mapped_lun == mapped_lun)
268 return deve;
269
270 return NULL;
271}
272EXPORT_SYMBOL(target_nacl_find_deve);
273
274void target_pr_kref_release(struct kref *kref)
275{
276 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
277 pr_kref);
278 complete(&deve->pr_comp);
279}
280
281/*
282 * Establish UA condition on SCSI device - all LUNs
283 */
284void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
285{
286 struct se_dev_entry *se_deve;
287 struct se_lun *lun;
288
289 spin_lock(lock: &dev->se_port_lock);
290 list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
291
292 spin_lock(lock: &lun->lun_deve_lock);
293 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
294 core_scsi3_ua_allocate(se_deve, asc, ascq);
295 spin_unlock(lock: &lun->lun_deve_lock);
296 }
297 spin_unlock(lock: &dev->se_port_lock);
298}
299
300static void
301target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
302 bool skip_new)
303{
304 struct se_dev_entry *tmp;
305
306 rcu_read_lock();
307 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
308 if (skip_new && tmp == new)
309 continue;
310 core_scsi3_ua_allocate(tmp, 0x3F,
311 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
312 }
313 rcu_read_unlock();
314}
315
316int core_enable_device_list_for_node(
317 struct se_lun *lun,
318 struct se_lun_acl *lun_acl,
319 u64 mapped_lun,
320 bool lun_access_ro,
321 struct se_node_acl *nacl,
322 struct se_portal_group *tpg)
323{
324 struct se_dev_entry *orig, *new;
325 int ret = 0;
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 new->stats = alloc_percpu(struct se_dev_entry_io_stats);
334 if (!new->stats) {
335 ret = -ENOMEM;
336 goto free_deve;
337 }
338
339 spin_lock_init(&new->ua_lock);
340 INIT_LIST_HEAD(list: &new->ua_list);
341 INIT_LIST_HEAD(list: &new->lun_link);
342
343 new->mapped_lun = mapped_lun;
344 kref_init(kref: &new->pr_kref);
345 init_completion(x: &new->pr_comp);
346
347 new->lun_access_ro = lun_access_ro;
348 new->creation_time = get_jiffies_64();
349 new->attach_count++;
350
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 = orig->se_lun;
355
356 if (orig_lun != lun) {
357 pr_err("Existing orig->se_lun doesn't match new lun"
358 " for dynamic -> explicit NodeACL conversion:"
359 " %s\n", nacl->initiatorname);
360 mutex_unlock(lock: &nacl->lun_entry_mutex);
361 ret = -EINVAL;
362 goto free_stats;
363 }
364 if (orig->se_lun_acl != NULL) {
365 pr_warn_ratelimited("Detected existing explicit"
366 " se_lun_acl->se_lun_group reference for %s"
367 " mapped_lun: %llu, failing\n",
368 nacl->initiatorname, mapped_lun);
369 mutex_unlock(lock: &nacl->lun_entry_mutex);
370 ret = -EINVAL;
371 goto free_stats;
372 }
373
374 new->se_lun = lun;
375 new->se_lun_acl = lun_acl;
376 hlist_del_rcu(n: &orig->link);
377 hlist_add_head_rcu(n: &new->link, h: &nacl->lun_entry_hlist);
378 mutex_unlock(lock: &nacl->lun_entry_mutex);
379
380 spin_lock(lock: &lun->lun_deve_lock);
381 list_del(entry: &orig->lun_link);
382 list_add_tail(new: &new->lun_link, head: &lun->lun_deve_list);
383 spin_unlock(lock: &lun->lun_deve_lock);
384
385 kref_put(kref: &orig->pr_kref, release: target_pr_kref_release);
386 wait_for_completion(&orig->pr_comp);
387
388 target_luns_data_has_changed(nacl, new, skip_new: true);
389 kfree_rcu(orig, rcu_head);
390 return 0;
391 }
392
393 new->se_lun = lun;
394 new->se_lun_acl = lun_acl;
395 hlist_add_head_rcu(n: &new->link, h: &nacl->lun_entry_hlist);
396 mutex_unlock(lock: &nacl->lun_entry_mutex);
397
398 spin_lock(lock: &lun->lun_deve_lock);
399 list_add_tail(new: &new->lun_link, head: &lun->lun_deve_list);
400 spin_unlock(lock: &lun->lun_deve_lock);
401
402 target_luns_data_has_changed(nacl, new, skip_new: true);
403 return 0;
404
405free_stats:
406 free_percpu(pdata: new->stats);
407free_deve:
408 kfree(objp: new);
409 return ret;
410}
411
412static void target_free_dev_entry(struct rcu_head *head)
413{
414 struct se_dev_entry *deve = container_of(head, struct se_dev_entry,
415 rcu_head);
416 free_percpu(pdata: deve->stats);
417 kfree(objp: deve);
418}
419
420void core_disable_device_list_for_node(
421 struct se_lun *lun,
422 struct se_dev_entry *orig,
423 struct se_node_acl *nacl,
424 struct se_portal_group *tpg)
425{
426 /*
427 * rcu_dereference_raw protected by se_lun->lun_group symlink
428 * reference to se_device->dev_group.
429 */
430 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
431
432 lockdep_assert_held(&nacl->lun_entry_mutex);
433
434 /*
435 * If the MappedLUN entry is being disabled, the entry in
436 * lun->lun_deve_list must be removed now before clearing the
437 * struct se_dev_entry pointers below as logic in
438 * core_alua_do_transition_tg_pt() depends on these being present.
439 *
440 * deve->se_lun_acl will be NULL for demo-mode created LUNs
441 * that have not been explicitly converted to MappedLUNs ->
442 * struct se_lun_acl, but we remove deve->lun_link from
443 * lun->lun_deve_list. This also means that active UAs and
444 * NodeACL context specific PR metadata for demo-mode
445 * MappedLUN *deve will be released below..
446 */
447 spin_lock(lock: &lun->lun_deve_lock);
448 list_del(entry: &orig->lun_link);
449 spin_unlock(lock: &lun->lun_deve_lock);
450 /*
451 * Disable struct se_dev_entry LUN ACL mapping
452 */
453 core_scsi3_ua_release_all(orig);
454
455 hlist_del_rcu(n: &orig->link);
456 clear_bit(DEF_PR_REG_ACTIVE, addr: &orig->deve_flags);
457 orig->lun_access_ro = false;
458 orig->creation_time = 0;
459 orig->attach_count--;
460 /*
461 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
462 * or REGISTER_AND_MOVE PR operation to complete.
463 */
464 kref_put(kref: &orig->pr_kref, release: target_pr_kref_release);
465 wait_for_completion(&orig->pr_comp);
466
467 call_rcu(head: &orig->rcu_head, func: target_free_dev_entry);
468
469 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
470 target_luns_data_has_changed(nacl, NULL, skip_new: false);
471}
472
473/* core_clear_lun_from_tpg():
474 *
475 *
476 */
477void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
478{
479 struct se_node_acl *nacl;
480 struct se_dev_entry *deve;
481
482 mutex_lock(&tpg->acl_node_mutex);
483 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
484
485 mutex_lock(&nacl->lun_entry_mutex);
486 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
487 if (lun != deve->se_lun)
488 continue;
489
490 core_disable_device_list_for_node(lun, orig: deve, nacl, tpg);
491 }
492 mutex_unlock(lock: &nacl->lun_entry_mutex);
493 }
494 mutex_unlock(lock: &tpg->acl_node_mutex);
495}
496
497static void se_release_vpd_for_dev(struct se_device *dev)
498{
499 struct t10_vpd *vpd, *vpd_tmp;
500
501 spin_lock(lock: &dev->t10_wwn.t10_vpd_lock);
502 list_for_each_entry_safe(vpd, vpd_tmp,
503 &dev->t10_wwn.t10_vpd_list, vpd_list) {
504 list_del(entry: &vpd->vpd_list);
505 kfree(objp: vpd);
506 }
507 spin_unlock(lock: &dev->t10_wwn.t10_vpd_lock);
508}
509
510static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
511{
512 u32 aligned_max_sectors;
513 u32 alignment;
514 /*
515 * Limit max_sectors to a PAGE_SIZE aligned value for modern
516 * transport_allocate_data_tasks() operation.
517 */
518 alignment = max(1ul, PAGE_SIZE / block_size);
519 aligned_max_sectors = rounddown(max_sectors, alignment);
520
521 if (max_sectors != aligned_max_sectors)
522 pr_info("Rounding down aligned max_sectors from %u to %u\n",
523 max_sectors, aligned_max_sectors);
524
525 return aligned_max_sectors;
526}
527
528int core_dev_add_lun(
529 struct se_portal_group *tpg,
530 struct se_device *dev,
531 struct se_lun *lun)
532{
533 int rc;
534
535 rc = core_tpg_add_lun(tpg, lun, false, dev);
536 if (rc < 0)
537 return rc;
538
539 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
540 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
541 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
542 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
543 /*
544 * Update LUN maps for dynamically added initiators when
545 * generate_node_acl is enabled.
546 */
547 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
548 struct se_node_acl *acl;
549
550 mutex_lock(&tpg->acl_node_mutex);
551 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
552 if (acl->dynamic_node_acl &&
553 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
554 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
555 core_tpg_add_node_to_devs(acl, tpg, lun);
556 }
557 }
558 mutex_unlock(lock: &tpg->acl_node_mutex);
559 }
560
561 return 0;
562}
563
564/* core_dev_del_lun():
565 *
566 *
567 */
568void core_dev_del_lun(
569 struct se_portal_group *tpg,
570 struct se_lun *lun)
571{
572 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
573 " device object\n", tpg->se_tpg_tfo->fabric_name,
574 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
575 tpg->se_tpg_tfo->fabric_name);
576
577 core_tpg_remove_lun(tpg, lun);
578}
579
580struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
581 struct se_portal_group *tpg,
582 struct se_node_acl *nacl,
583 u64 mapped_lun,
584 int *ret)
585{
586 struct se_lun_acl *lacl;
587
588 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
589 pr_err("%s InitiatorName exceeds maximum size.\n",
590 tpg->se_tpg_tfo->fabric_name);
591 *ret = -EOVERFLOW;
592 return NULL;
593 }
594 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
595 if (!lacl) {
596 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
597 *ret = -ENOMEM;
598 return NULL;
599 }
600
601 lacl->mapped_lun = mapped_lun;
602 lacl->se_lun_nacl = nacl;
603
604 return lacl;
605}
606
607int core_dev_add_initiator_node_lun_acl(
608 struct se_portal_group *tpg,
609 struct se_lun_acl *lacl,
610 struct se_lun *lun,
611 bool lun_access_ro)
612{
613 struct se_node_acl *nacl = lacl->se_lun_nacl;
614 /*
615 * rcu_dereference_raw protected by se_lun->lun_group symlink
616 * reference to se_device->dev_group.
617 */
618 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
619
620 if (!nacl)
621 return -EINVAL;
622
623 if (lun->lun_access_ro)
624 lun_access_ro = true;
625
626 lacl->se_lun = lun;
627
628 if (core_enable_device_list_for_node(lun, lun_acl: lacl, mapped_lun: lacl->mapped_lun,
629 lun_access_ro, nacl, tpg) < 0)
630 return -EINVAL;
631
632 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
633 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
634 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
635 lun_access_ro ? "RO" : "RW",
636 nacl->initiatorname);
637 /*
638 * Check to see if there are any existing persistent reservation APTPL
639 * pre-registrations that need to be enabled for this LUN ACL..
640 */
641 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
642 lacl->mapped_lun);
643 return 0;
644}
645
646int core_dev_del_initiator_node_lun_acl(
647 struct se_lun *lun,
648 struct se_lun_acl *lacl)
649{
650 struct se_portal_group *tpg = lun->lun_tpg;
651 struct se_node_acl *nacl;
652 struct se_dev_entry *deve;
653
654 nacl = lacl->se_lun_nacl;
655 if (!nacl)
656 return -EINVAL;
657
658 mutex_lock(&nacl->lun_entry_mutex);
659 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
660 if (deve)
661 core_disable_device_list_for_node(lun, orig: deve, nacl, tpg);
662 mutex_unlock(lock: &nacl->lun_entry_mutex);
663
664 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
665 " InitiatorNode: %s Mapped LUN: %llu\n",
666 tpg->se_tpg_tfo->fabric_name,
667 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
668 nacl->initiatorname, lacl->mapped_lun);
669
670 return 0;
671}
672
673void core_dev_free_initiator_node_lun_acl(
674 struct se_portal_group *tpg,
675 struct se_lun_acl *lacl)
676{
677 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
678 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
679 tpg->se_tpg_tfo->tpg_get_tag(tpg),
680 tpg->se_tpg_tfo->fabric_name,
681 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
682
683 kfree(objp: lacl);
684}
685
686static void scsi_dump_inquiry(struct se_device *dev)
687{
688 struct t10_wwn *wwn = &dev->t10_wwn;
689 int device_type = dev->transport->get_device_type(dev);
690
691 /*
692 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
693 */
694 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
695 wwn->vendor);
696 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
697 wwn->model);
698 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
699 wwn->revision);
700 pr_debug(" Type: %s ", scsi_device_type(device_type));
701}
702
703static void target_non_ordered_release(struct percpu_ref *ref)
704{
705 struct se_device *dev = container_of(ref, struct se_device,
706 non_ordered);
707 unsigned long flags;
708
709 spin_lock_irqsave(&dev->delayed_cmd_lock, flags);
710 if (!list_empty(head: &dev->delayed_cmd_list))
711 schedule_work(work: &dev->delayed_cmd_work);
712 spin_unlock_irqrestore(lock: &dev->delayed_cmd_lock, flags);
713}
714
715struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
716{
717 struct se_device *dev;
718 struct se_lun *xcopy_lun;
719 int i;
720
721 dev = hba->backend->ops->alloc_device(hba, name);
722 if (!dev)
723 return NULL;
724
725 dev->stats = alloc_percpu(struct se_dev_io_stats);
726 if (!dev->stats)
727 goto free_device;
728
729 dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
730 if (!dev->queues)
731 goto free_stats;
732
733 dev->queue_cnt = nr_cpu_ids;
734 for (i = 0; i < dev->queue_cnt; i++) {
735 struct se_device_queue *q;
736
737 q = &dev->queues[i];
738 INIT_LIST_HEAD(list: &q->state_list);
739 spin_lock_init(&q->lock);
740
741 init_llist_head(list: &q->sq.cmd_list);
742 INIT_WORK(&q->sq.work, target_queued_submit_work);
743 }
744
745 if (percpu_ref_init(ref: &dev->non_ordered, release: target_non_ordered_release,
746 flags: PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
747 goto free_queues;
748
749 dev->se_hba = hba;
750 dev->transport = hba->backend->ops;
751 dev->transport_flags = dev->transport->transport_flags_default;
752 dev->prot_length = sizeof(struct t10_pi_tuple);
753 dev->hba_index = hba->hba_index;
754
755 INIT_LIST_HEAD(list: &dev->dev_sep_list);
756 INIT_LIST_HEAD(list: &dev->dev_tmr_list);
757 INIT_LIST_HEAD(list: &dev->delayed_cmd_list);
758 INIT_LIST_HEAD(list: &dev->qf_cmd_list);
759 spin_lock_init(&dev->delayed_cmd_lock);
760 spin_lock_init(&dev->dev_reservation_lock);
761 spin_lock_init(&dev->se_port_lock);
762 spin_lock_init(&dev->se_tmr_lock);
763 spin_lock_init(&dev->qf_cmd_lock);
764 sema_init(sem: &dev->caw_sem, val: 1);
765 INIT_LIST_HEAD(list: &dev->t10_wwn.t10_vpd_list);
766 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
767 INIT_LIST_HEAD(list: &dev->t10_pr.registration_list);
768 INIT_LIST_HEAD(list: &dev->t10_pr.aptpl_reg_list);
769 spin_lock_init(&dev->t10_pr.registration_lock);
770 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
771 INIT_LIST_HEAD(list: &dev->t10_alua.tg_pt_gps_list);
772 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
773 INIT_LIST_HEAD(list: &dev->t10_alua.lba_map_list);
774 spin_lock_init(&dev->t10_alua.lba_map_lock);
775
776 INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
777 mutex_init(&dev->lun_reset_mutex);
778
779 dev->t10_wwn.t10_dev = dev;
780 /*
781 * Use OpenFabrics IEEE Company ID: 00 14 05
782 */
783 dev->t10_wwn.company_id = 0x001405;
784
785 dev->t10_alua.t10_dev = dev;
786
787 dev->dev_attrib.da_dev = dev;
788 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
789 dev->dev_attrib.emulate_dpo = 1;
790 dev->dev_attrib.emulate_fua_write = 1;
791 dev->dev_attrib.emulate_fua_read = 1;
792 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
793 dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
794 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
795 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
796 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
797 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
798 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
799 dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
800 dev->dev_attrib.emulate_rsoc = DA_EMULATE_RSOC;
801 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
802 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
803 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
804 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
805 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
806 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
807 dev->dev_attrib.max_unmap_block_desc_count =
808 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
809 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
810 dev->dev_attrib.unmap_granularity_alignment =
811 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
812 dev->dev_attrib.unmap_zeroes_data =
813 DA_UNMAP_ZEROES_DATA_DEFAULT;
814 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
815 dev->dev_attrib.submit_type = TARGET_FABRIC_DEFAULT_SUBMIT;
816
817 /* Skip allocating lun_stats since we can't export them. */
818 xcopy_lun = &dev->xcopy_lun;
819 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
820 init_completion(x: &xcopy_lun->lun_shutdown_comp);
821 INIT_LIST_HEAD(list: &xcopy_lun->lun_deve_list);
822 INIT_LIST_HEAD(list: &xcopy_lun->lun_dev_link);
823 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
824 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
825
826 /* Preload the default INQUIRY const values */
827 strscpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
828 strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
829 sizeof(dev->t10_wwn.model));
830 strscpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
831 sizeof(dev->t10_wwn.revision));
832
833 return dev;
834
835free_queues:
836 kfree(objp: dev->queues);
837free_stats:
838 free_percpu(pdata: dev->stats);
839free_device:
840 hba->backend->ops->free_device(dev);
841 return NULL;
842}
843
844void target_configure_write_atomic_from_bdev(struct se_dev_attrib *attrib,
845 struct block_device *bdev)
846{
847 struct request_queue *q = bdev_get_queue(bdev);
848 int block_size = bdev_logical_block_size(bdev);
849
850 if (!bdev_can_atomic_write(bdev))
851 return;
852
853 attrib->atomic_max_len = queue_atomic_write_max_bytes(q) / block_size;
854 attrib->atomic_granularity = attrib->atomic_alignment =
855 queue_atomic_write_unit_min_bytes(q) / block_size;
856 attrib->atomic_max_with_boundary = 0;
857 attrib->atomic_max_boundary = 0;
858}
859EXPORT_SYMBOL_GPL(target_configure_write_atomic_from_bdev);
860
861/*
862 * Check if the underlying struct block_device supports discard and if yes
863 * configure the UNMAP parameters.
864 */
865bool target_configure_unmap_from_bdev(struct se_dev_attrib *attrib,
866 struct block_device *bdev)
867{
868 int block_size = bdev_logical_block_size(bdev);
869
870 if (!bdev_max_discard_sectors(bdev))
871 return false;
872
873 attrib->max_unmap_lba_count =
874 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
875 /*
876 * Currently hardcoded to 1 in Linux/SCSI code..
877 */
878 attrib->max_unmap_block_desc_count = 1;
879 attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
880 attrib->unmap_granularity_alignment =
881 bdev_discard_alignment(bdev) / block_size;
882 return true;
883}
884EXPORT_SYMBOL(target_configure_unmap_from_bdev);
885
886/*
887 * Convert from blocksize advertised to the initiator to the 512 byte
888 * units unconditionally used by the Linux block layer.
889 */
890sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
891{
892 switch (dev->dev_attrib.block_size) {
893 case 4096:
894 return lb << 3;
895 case 2048:
896 return lb << 2;
897 case 1024:
898 return lb << 1;
899 default:
900 return lb;
901 }
902}
903EXPORT_SYMBOL(target_to_linux_sector);
904
905struct devices_idr_iter {
906 int (*fn)(struct se_device *dev, void *data);
907 void *data;
908};
909
910static int target_devices_idr_iter(int id, void *p, void *data)
911 __must_hold(&device_mutex)
912{
913 struct devices_idr_iter *iter = data;
914 struct se_device *dev = p;
915 struct config_item *item;
916 int ret;
917
918 /*
919 * We add the device early to the idr, so it can be used
920 * by backend modules during configuration. We do not want
921 * to allow other callers to access partially setup devices,
922 * so we skip them here.
923 */
924 if (!target_dev_configured(se_dev: dev))
925 return 0;
926
927 item = config_item_get_unless_zero(&dev->dev_group.cg_item);
928 if (!item)
929 return 0;
930 mutex_unlock(lock: &device_mutex);
931
932 ret = iter->fn(dev, iter->data);
933 config_item_put(item);
934
935 mutex_lock(&device_mutex);
936 return ret;
937}
938
939/**
940 * target_for_each_device - iterate over configured devices
941 * @fn: iterator function
942 * @data: pointer to data that will be passed to fn
943 *
944 * fn must return 0 to continue looping over devices. non-zero will break
945 * from the loop and return that value to the caller.
946 */
947int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
948 void *data)
949{
950 struct devices_idr_iter iter = { .fn = fn, .data = data };
951 int ret;
952
953 mutex_lock(&device_mutex);
954 ret = idr_for_each(&devices_idr, fn: target_devices_idr_iter, data: &iter);
955 mutex_unlock(lock: &device_mutex);
956 return ret;
957}
958
959int target_configure_device(struct se_device *dev)
960{
961 struct se_hba *hba = dev->se_hba;
962 int ret, id;
963
964 if (target_dev_configured(se_dev: dev)) {
965 pr_err("se_dev->se_dev_ptr already set for storage"
966 " object\n");
967 return -EEXIST;
968 }
969
970 /*
971 * Add early so modules like tcmu can use during its
972 * configuration.
973 */
974 mutex_lock(&device_mutex);
975 /*
976 * Use cyclic to try and avoid collisions with devices
977 * that were recently removed.
978 */
979 id = idr_alloc_cyclic(&devices_idr, ptr: dev, start: 0, INT_MAX, GFP_KERNEL);
980 mutex_unlock(lock: &device_mutex);
981 if (id < 0) {
982 ret = -ENOMEM;
983 goto out;
984 }
985 dev->dev_index = id;
986
987 ret = dev->transport->configure_device(dev);
988 if (ret)
989 goto out_free_index;
990
991 if (dev->transport->configure_unmap &&
992 dev->transport->configure_unmap(dev)) {
993 pr_debug("Discard support available, but disabled by default.\n");
994 }
995
996 /*
997 * XXX: there is not much point to have two different values here..
998 */
999 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1000 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1001
1002 /*
1003 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1004 */
1005 dev->dev_attrib.hw_max_sectors =
1006 se_dev_align_max_sectors(max_sectors: dev->dev_attrib.hw_max_sectors,
1007 block_size: dev->dev_attrib.hw_block_size);
1008 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1009
1010 dev->creation_time = get_jiffies_64();
1011
1012 ret = core_setup_alua(dev);
1013 if (ret)
1014 goto out_destroy_device;
1015
1016 /*
1017 * Setup work_queue for QUEUE_FULL
1018 */
1019 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1020
1021 scsi_dump_inquiry(dev);
1022
1023 spin_lock(lock: &hba->device_lock);
1024 hba->dev_count++;
1025 spin_unlock(lock: &hba->device_lock);
1026
1027 dev->dev_flags |= DF_CONFIGURED;
1028
1029 return 0;
1030
1031out_destroy_device:
1032 dev->transport->destroy_device(dev);
1033out_free_index:
1034 mutex_lock(&device_mutex);
1035 idr_remove(&devices_idr, id: dev->dev_index);
1036 mutex_unlock(lock: &device_mutex);
1037out:
1038 se_release_vpd_for_dev(dev);
1039 return ret;
1040}
1041
1042void target_free_device(struct se_device *dev)
1043{
1044 struct se_hba *hba = dev->se_hba;
1045
1046 WARN_ON(!list_empty(&dev->dev_sep_list));
1047
1048 percpu_ref_exit(ref: &dev->non_ordered);
1049 cancel_work_sync(work: &dev->delayed_cmd_work);
1050
1051 if (target_dev_configured(se_dev: dev)) {
1052 dev->transport->destroy_device(dev);
1053
1054 mutex_lock(&device_mutex);
1055 idr_remove(&devices_idr, id: dev->dev_index);
1056 mutex_unlock(lock: &device_mutex);
1057
1058 spin_lock(lock: &hba->device_lock);
1059 hba->dev_count--;
1060 spin_unlock(lock: &hba->device_lock);
1061 }
1062
1063 core_alua_free_lu_gp_mem(dev);
1064 core_alua_set_lba_map(dev, NULL, 0, 0);
1065 core_scsi3_free_all_registrations(dev);
1066 se_release_vpd_for_dev(dev);
1067
1068 if (dev->transport->free_prot)
1069 dev->transport->free_prot(dev);
1070
1071 kfree(objp: dev->queues);
1072 free_percpu(pdata: dev->stats);
1073 dev->transport->free_device(dev);
1074}
1075
1076int core_dev_setup_virtual_lun0(void)
1077{
1078 struct se_hba *hba;
1079 struct se_device *dev;
1080 char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1081 int ret;
1082
1083 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1084 if (IS_ERR(ptr: hba))
1085 return PTR_ERR(ptr: hba);
1086
1087 dev = target_alloc_device(hba, name: "virt_lun0");
1088 if (!dev) {
1089 ret = -ENOMEM;
1090 goto out_free_hba;
1091 }
1092
1093 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1094
1095 ret = target_configure_device(dev);
1096 if (ret)
1097 goto out_free_se_dev;
1098
1099 lun0_hba = hba;
1100 g_lun0_dev = dev;
1101 return 0;
1102
1103out_free_se_dev:
1104 target_free_device(dev);
1105out_free_hba:
1106 core_delete_hba(hba);
1107 return ret;
1108}
1109
1110
1111void core_dev_release_virtual_lun0(void)
1112{
1113 struct se_hba *hba = lun0_hba;
1114
1115 if (!hba)
1116 return;
1117
1118 if (g_lun0_dev)
1119 target_free_device(dev: g_lun0_dev);
1120 core_delete_hba(hba);
1121}
1122
1123/*
1124 * Common CDB parsing for kernel and user passthrough.
1125 */
1126sense_reason_t
1127passthrough_parse_cdb(struct se_cmd *cmd,
1128 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1129{
1130 unsigned char *cdb = cmd->t_task_cdb;
1131 struct se_device *dev = cmd->se_dev;
1132 unsigned int size;
1133
1134 /*
1135 * For REPORT LUNS we always need to emulate the response, for everything
1136 * else, pass it up.
1137 */
1138 if (cdb[0] == REPORT_LUNS) {
1139 cmd->execute_cmd = spc_emulate_report_luns;
1140 return TCM_NO_SENSE;
1141 }
1142
1143 /*
1144 * With emulate_pr disabled, all reservation requests should fail,
1145 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1146 */
1147 if (!dev->dev_attrib.emulate_pr &&
1148 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1149 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1150 (cdb[0] == RELEASE_6 || cdb[0] == RELEASE_10) ||
1151 (cdb[0] == RESERVE_6 || cdb[0] == RESERVE_10))) {
1152 return TCM_UNSUPPORTED_SCSI_OPCODE;
1153 }
1154
1155 /*
1156 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1157 * emulate the response, since tcmu does not have the information
1158 * required to process these commands.
1159 */
1160 if (!(dev->transport_flags &
1161 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1162 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1163 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1164 size = get_unaligned_be16(p: &cdb[7]);
1165 return target_cmd_size_check(cmd, size);
1166 }
1167 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1168 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1169 size = get_unaligned_be32(p: &cdb[5]);
1170 return target_cmd_size_check(cmd, size);
1171 }
1172
1173 if (cdb[0] == RELEASE_6 || cdb[0] == RELEASE_10) {
1174 cmd->execute_cmd = target_scsi2_reservation_release;
1175 if (cdb[0] == RELEASE_10)
1176 size = get_unaligned_be16(p: &cdb[7]);
1177 else
1178 size = cmd->data_length;
1179 return target_cmd_size_check(cmd, size);
1180 }
1181 if (cdb[0] == RESERVE_6 || cdb[0] == RESERVE_10) {
1182 cmd->execute_cmd = target_scsi2_reservation_reserve;
1183 if (cdb[0] == RESERVE_10)
1184 size = get_unaligned_be16(p: &cdb[7]);
1185 else
1186 size = cmd->data_length;
1187 return target_cmd_size_check(cmd, size);
1188 }
1189 }
1190
1191 /* Set DATA_CDB flag for ops that should have it */
1192 switch (cdb[0]) {
1193 case READ_6:
1194 case READ_10:
1195 case READ_12:
1196 case READ_16:
1197 case WRITE_6:
1198 case WRITE_10:
1199 case WRITE_12:
1200 case WRITE_16:
1201 case WRITE_VERIFY:
1202 case WRITE_VERIFY_12:
1203 case WRITE_VERIFY_16:
1204 case COMPARE_AND_WRITE:
1205 case XDWRITEREAD_10:
1206 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1207 break;
1208 case VARIABLE_LENGTH_CMD:
1209 switch (get_unaligned_be16(p: &cdb[8])) {
1210 case READ_32:
1211 case WRITE_32:
1212 case WRITE_VERIFY_32:
1213 case XDWRITEREAD_32:
1214 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1215 break;
1216 }
1217 }
1218
1219 cmd->execute_cmd = exec_cmd;
1220
1221 return TCM_NO_SENSE;
1222}
1223EXPORT_SYMBOL(passthrough_parse_cdb);
1224

source code of linux/drivers/target/target_core_device.c