1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * Filename: target_core_device.c (based on iscsi_target_device.c)
4 *
5 * This file contains the TCM Virtual Device and Disk Transport
6 * agnostic related functions.
7 *
8 * (c) Copyright 2003-2013 Datera, Inc.
9 *
10 * Nicholas A. Bellinger <nab@kernel.org>
11 *
12 ******************************************************************************/
13
14 #include <linux/net.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/timer.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/kthread.h>
21 #include <linux/in.h>
22 #include <linux/export.h>
23 #include <linux/t10-pi.h>
24 #include <asm/unaligned.h>
25 #include <net/sock.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi_common.h>
28 #include <scsi/scsi_proto.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38
39 static DEFINE_MUTEX(device_mutex);
40 static DEFINE_IDR(devices_idr);
41
42 static struct se_hba *lun0_hba;
43 /* not static, needed by tpg.c */
44 struct se_device *g_lun0_dev;
45
46 sense_reason_t
transport_lookup_cmd_lun(struct se_cmd * se_cmd)47 transport_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 atomic_long_inc(&deve->total_cmds);
59
60 if (se_cmd->data_direction == DMA_TO_DEVICE)
61 atomic_long_add(se_cmd->data_length,
62 &deve->write_bytes);
63 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
64 atomic_long_add(se_cmd->data_length,
65 &deve->read_bytes);
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(&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 }
89 out_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(&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 atomic_long_inc(&se_cmd->se_dev->num_cmds);
130
131 if (se_cmd->data_direction == DMA_TO_DEVICE)
132 atomic_long_add(se_cmd->data_length,
133 &se_cmd->se_dev->write_bytes);
134 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
135 atomic_long_add(se_cmd->data_length,
136 &se_cmd->se_dev->read_bytes);
137
138 return ret;
139 }
140 EXPORT_SYMBOL(transport_lookup_cmd_lun);
141
transport_lookup_tmr_lun(struct se_cmd * se_cmd)142 int 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(&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 }
165 out_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 }
181 EXPORT_SYMBOL(transport_lookup_tmr_lun);
182
target_lun_is_rdonly(struct se_cmd * cmd)183 bool 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 }
196 EXPORT_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 */
core_get_se_deve_from_rtpi(struct se_node_acl * nacl,u16 rtpi)203 struct 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(&deve->pr_kref);
224 rcu_read_unlock();
225
226 return deve;
227 }
228 rcu_read_unlock();
229
230 return NULL;
231 }
232
core_free_device_list_for_node(struct se_node_acl * nacl,struct se_portal_group * tpg)233 void 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(&nacl->lun_entry_mutex);
243 }
244
core_update_device_list_access(u64 mapped_lun,bool lun_access_ro,struct se_node_acl * nacl)245 void 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(&nacl->lun_entry_mutex);
257 }
258
259 /*
260 * Called with rcu_read_lock or nacl->device_list_lock held.
261 */
target_nacl_find_deve(struct se_node_acl * nacl,u64 mapped_lun)262 struct 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 }
272 EXPORT_SYMBOL(target_nacl_find_deve);
273
target_pr_kref_release(struct kref * kref)274 void 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 */
target_dev_ua_allocate(struct se_device * dev,u8 asc,u8 ascq)284 void 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(&dev->se_port_lock);
290 list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
291
292 spin_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(&lun->lun_deve_lock);
296 }
297 spin_unlock(&dev->se_port_lock);
298 }
299
300 static void
target_luns_data_has_changed(struct se_node_acl * nacl,struct se_dev_entry * new,bool skip_new)301 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
302 bool skip_new)
303 {
304 struct se_dev_entry *tmp;
305
306 rcu_read_lock();
307 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
308 if (skip_new && tmp == new)
309 continue;
310 core_scsi3_ua_allocate(tmp, 0x3F,
311 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
312 }
313 rcu_read_unlock();
314 }
315
core_enable_device_list_for_node(struct se_lun * lun,struct se_lun_acl * lun_acl,u64 mapped_lun,bool lun_access_ro,struct se_node_acl * nacl,struct se_portal_group * tpg)316 int core_enable_device_list_for_node(
317 struct se_lun *lun,
318 struct se_lun_acl *lun_acl,
319 u64 mapped_lun,
320 bool lun_access_ro,
321 struct se_node_acl *nacl,
322 struct se_portal_group *tpg)
323 {
324 struct se_dev_entry *orig, *new;
325
326 new = kzalloc(sizeof(*new), GFP_KERNEL);
327 if (!new) {
328 pr_err("Unable to allocate se_dev_entry memory\n");
329 return -ENOMEM;
330 }
331
332 spin_lock_init(&new->ua_lock);
333 INIT_LIST_HEAD(&new->ua_list);
334 INIT_LIST_HEAD(&new->lun_link);
335
336 new->mapped_lun = mapped_lun;
337 kref_init(&new->pr_kref);
338 init_completion(&new->pr_comp);
339
340 new->lun_access_ro = lun_access_ro;
341 new->creation_time = get_jiffies_64();
342 new->attach_count++;
343
344 mutex_lock(&nacl->lun_entry_mutex);
345 orig = target_nacl_find_deve(nacl, mapped_lun);
346 if (orig && orig->se_lun) {
347 struct se_lun *orig_lun = orig->se_lun;
348
349 if (orig_lun != lun) {
350 pr_err("Existing orig->se_lun doesn't match new lun"
351 " for dynamic -> explicit NodeACL conversion:"
352 " %s\n", nacl->initiatorname);
353 mutex_unlock(&nacl->lun_entry_mutex);
354 kfree(new);
355 return -EINVAL;
356 }
357 if (orig->se_lun_acl != NULL) {
358 pr_warn_ratelimited("Detected existing explicit"
359 " se_lun_acl->se_lun_group reference for %s"
360 " mapped_lun: %llu, failing\n",
361 nacl->initiatorname, mapped_lun);
362 mutex_unlock(&nacl->lun_entry_mutex);
363 kfree(new);
364 return -EINVAL;
365 }
366
367 new->se_lun = lun;
368 new->se_lun_acl = lun_acl;
369 hlist_del_rcu(&orig->link);
370 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
371 mutex_unlock(&nacl->lun_entry_mutex);
372
373 spin_lock(&lun->lun_deve_lock);
374 list_del(&orig->lun_link);
375 list_add_tail(&new->lun_link, &lun->lun_deve_list);
376 spin_unlock(&lun->lun_deve_lock);
377
378 kref_put(&orig->pr_kref, target_pr_kref_release);
379 wait_for_completion(&orig->pr_comp);
380
381 target_luns_data_has_changed(nacl, new, true);
382 kfree_rcu(orig, rcu_head);
383 return 0;
384 }
385
386 new->se_lun = lun;
387 new->se_lun_acl = lun_acl;
388 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
389 mutex_unlock(&nacl->lun_entry_mutex);
390
391 spin_lock(&lun->lun_deve_lock);
392 list_add_tail(&new->lun_link, &lun->lun_deve_list);
393 spin_unlock(&lun->lun_deve_lock);
394
395 target_luns_data_has_changed(nacl, new, true);
396 return 0;
397 }
398
core_disable_device_list_for_node(struct se_lun * lun,struct se_dev_entry * orig,struct se_node_acl * nacl,struct se_portal_group * tpg)399 void core_disable_device_list_for_node(
400 struct se_lun *lun,
401 struct se_dev_entry *orig,
402 struct se_node_acl *nacl,
403 struct se_portal_group *tpg)
404 {
405 /*
406 * rcu_dereference_raw protected by se_lun->lun_group symlink
407 * reference to se_device->dev_group.
408 */
409 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
410
411 lockdep_assert_held(&nacl->lun_entry_mutex);
412
413 /*
414 * If the MappedLUN entry is being disabled, the entry in
415 * lun->lun_deve_list must be removed now before clearing the
416 * struct se_dev_entry pointers below as logic in
417 * core_alua_do_transition_tg_pt() depends on these being present.
418 *
419 * deve->se_lun_acl will be NULL for demo-mode created LUNs
420 * that have not been explicitly converted to MappedLUNs ->
421 * struct se_lun_acl, but we remove deve->lun_link from
422 * lun->lun_deve_list. This also means that active UAs and
423 * NodeACL context specific PR metadata for demo-mode
424 * MappedLUN *deve will be released below..
425 */
426 spin_lock(&lun->lun_deve_lock);
427 list_del(&orig->lun_link);
428 spin_unlock(&lun->lun_deve_lock);
429 /*
430 * Disable struct se_dev_entry LUN ACL mapping
431 */
432 core_scsi3_ua_release_all(orig);
433
434 hlist_del_rcu(&orig->link);
435 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
436 orig->lun_access_ro = false;
437 orig->creation_time = 0;
438 orig->attach_count--;
439 /*
440 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
441 * or REGISTER_AND_MOVE PR operation to complete.
442 */
443 kref_put(&orig->pr_kref, target_pr_kref_release);
444 wait_for_completion(&orig->pr_comp);
445
446 kfree_rcu(orig, rcu_head);
447
448 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
449 target_luns_data_has_changed(nacl, NULL, false);
450 }
451
452 /* core_clear_lun_from_tpg():
453 *
454 *
455 */
core_clear_lun_from_tpg(struct se_lun * lun,struct se_portal_group * tpg)456 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
457 {
458 struct se_node_acl *nacl;
459 struct se_dev_entry *deve;
460
461 mutex_lock(&tpg->acl_node_mutex);
462 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
463
464 mutex_lock(&nacl->lun_entry_mutex);
465 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
466 if (lun != deve->se_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
se_release_vpd_for_dev(struct se_device * dev)476 static void se_release_vpd_for_dev(struct se_device *dev)
477 {
478 struct t10_vpd *vpd, *vpd_tmp;
479
480 spin_lock(&dev->t10_wwn.t10_vpd_lock);
481 list_for_each_entry_safe(vpd, vpd_tmp,
482 &dev->t10_wwn.t10_vpd_list, vpd_list) {
483 list_del(&vpd->vpd_list);
484 kfree(vpd);
485 }
486 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
487 }
488
se_dev_align_max_sectors(u32 max_sectors,u32 block_size)489 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
490 {
491 u32 aligned_max_sectors;
492 u32 alignment;
493 /*
494 * Limit max_sectors to a PAGE_SIZE aligned value for modern
495 * transport_allocate_data_tasks() operation.
496 */
497 alignment = max(1ul, PAGE_SIZE / block_size);
498 aligned_max_sectors = rounddown(max_sectors, alignment);
499
500 if (max_sectors != aligned_max_sectors)
501 pr_info("Rounding down aligned max_sectors from %u to %u\n",
502 max_sectors, aligned_max_sectors);
503
504 return aligned_max_sectors;
505 }
506
core_dev_add_lun(struct se_portal_group * tpg,struct se_device * dev,struct se_lun * lun)507 int core_dev_add_lun(
508 struct se_portal_group *tpg,
509 struct se_device *dev,
510 struct se_lun *lun)
511 {
512 int rc;
513
514 rc = core_tpg_add_lun(tpg, lun, false, dev);
515 if (rc < 0)
516 return rc;
517
518 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
519 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
520 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
521 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
522 /*
523 * Update LUN maps for dynamically added initiators when
524 * generate_node_acl is enabled.
525 */
526 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
527 struct se_node_acl *acl;
528
529 mutex_lock(&tpg->acl_node_mutex);
530 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
531 if (acl->dynamic_node_acl &&
532 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
533 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
534 core_tpg_add_node_to_devs(acl, tpg, lun);
535 }
536 }
537 mutex_unlock(&tpg->acl_node_mutex);
538 }
539
540 return 0;
541 }
542
543 /* core_dev_del_lun():
544 *
545 *
546 */
core_dev_del_lun(struct se_portal_group * tpg,struct se_lun * lun)547 void core_dev_del_lun(
548 struct se_portal_group *tpg,
549 struct se_lun *lun)
550 {
551 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
552 " device object\n", tpg->se_tpg_tfo->fabric_name,
553 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
554 tpg->se_tpg_tfo->fabric_name);
555
556 core_tpg_remove_lun(tpg, lun);
557 }
558
core_dev_init_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_node_acl * nacl,u64 mapped_lun,int * ret)559 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
560 struct se_portal_group *tpg,
561 struct se_node_acl *nacl,
562 u64 mapped_lun,
563 int *ret)
564 {
565 struct se_lun_acl *lacl;
566
567 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
568 pr_err("%s InitiatorName exceeds maximum size.\n",
569 tpg->se_tpg_tfo->fabric_name);
570 *ret = -EOVERFLOW;
571 return NULL;
572 }
573 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
574 if (!lacl) {
575 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
576 *ret = -ENOMEM;
577 return NULL;
578 }
579
580 lacl->mapped_lun = mapped_lun;
581 lacl->se_lun_nacl = nacl;
582
583 return lacl;
584 }
585
core_dev_add_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_lun_acl * lacl,struct se_lun * lun,bool lun_access_ro)586 int core_dev_add_initiator_node_lun_acl(
587 struct se_portal_group *tpg,
588 struct se_lun_acl *lacl,
589 struct se_lun *lun,
590 bool lun_access_ro)
591 {
592 struct se_node_acl *nacl = lacl->se_lun_nacl;
593 /*
594 * rcu_dereference_raw protected by se_lun->lun_group symlink
595 * reference to se_device->dev_group.
596 */
597 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
598
599 if (!nacl)
600 return -EINVAL;
601
602 if (lun->lun_access_ro)
603 lun_access_ro = true;
604
605 lacl->se_lun = lun;
606
607 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
608 lun_access_ro, nacl, tpg) < 0)
609 return -EINVAL;
610
611 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
612 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
613 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
614 lun_access_ro ? "RO" : "RW",
615 nacl->initiatorname);
616 /*
617 * Check to see if there are any existing persistent reservation APTPL
618 * pre-registrations that need to be enabled for this LUN ACL..
619 */
620 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
621 lacl->mapped_lun);
622 return 0;
623 }
624
core_dev_del_initiator_node_lun_acl(struct se_lun * lun,struct se_lun_acl * lacl)625 int core_dev_del_initiator_node_lun_acl(
626 struct se_lun *lun,
627 struct se_lun_acl *lacl)
628 {
629 struct se_portal_group *tpg = lun->lun_tpg;
630 struct se_node_acl *nacl;
631 struct se_dev_entry *deve;
632
633 nacl = lacl->se_lun_nacl;
634 if (!nacl)
635 return -EINVAL;
636
637 mutex_lock(&nacl->lun_entry_mutex);
638 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
639 if (deve)
640 core_disable_device_list_for_node(lun, deve, nacl, tpg);
641 mutex_unlock(&nacl->lun_entry_mutex);
642
643 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
644 " InitiatorNode: %s Mapped LUN: %llu\n",
645 tpg->se_tpg_tfo->fabric_name,
646 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
647 nacl->initiatorname, lacl->mapped_lun);
648
649 return 0;
650 }
651
core_dev_free_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_lun_acl * lacl)652 void core_dev_free_initiator_node_lun_acl(
653 struct se_portal_group *tpg,
654 struct se_lun_acl *lacl)
655 {
656 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
657 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
658 tpg->se_tpg_tfo->tpg_get_tag(tpg),
659 tpg->se_tpg_tfo->fabric_name,
660 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
661
662 kfree(lacl);
663 }
664
scsi_dump_inquiry(struct se_device * dev)665 static void scsi_dump_inquiry(struct se_device *dev)
666 {
667 struct t10_wwn *wwn = &dev->t10_wwn;
668 int device_type = dev->transport->get_device_type(dev);
669
670 /*
671 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
672 */
673 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
674 wwn->vendor);
675 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
676 wwn->model);
677 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
678 wwn->revision);
679 pr_debug(" Type: %s ", scsi_device_type(device_type));
680 }
681
target_alloc_device(struct se_hba * hba,const char * name)682 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
683 {
684 struct se_device *dev;
685 struct se_lun *xcopy_lun;
686 int i;
687
688 dev = hba->backend->ops->alloc_device(hba, name);
689 if (!dev)
690 return NULL;
691
692 dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
693 if (!dev->queues) {
694 dev->transport->free_device(dev);
695 return NULL;
696 }
697
698 dev->queue_cnt = nr_cpu_ids;
699 for (i = 0; i < dev->queue_cnt; i++) {
700 struct se_device_queue *q;
701
702 q = &dev->queues[i];
703 INIT_LIST_HEAD(&q->state_list);
704 spin_lock_init(&q->lock);
705
706 init_llist_head(&q->sq.cmd_list);
707 INIT_WORK(&q->sq.work, target_queued_submit_work);
708 }
709
710 dev->se_hba = hba;
711 dev->transport = hba->backend->ops;
712 dev->transport_flags = dev->transport->transport_flags_default;
713 dev->prot_length = sizeof(struct t10_pi_tuple);
714 dev->hba_index = hba->hba_index;
715
716 INIT_LIST_HEAD(&dev->dev_sep_list);
717 INIT_LIST_HEAD(&dev->dev_tmr_list);
718 INIT_LIST_HEAD(&dev->delayed_cmd_list);
719 INIT_LIST_HEAD(&dev->qf_cmd_list);
720 spin_lock_init(&dev->delayed_cmd_lock);
721 spin_lock_init(&dev->dev_reservation_lock);
722 spin_lock_init(&dev->se_port_lock);
723 spin_lock_init(&dev->se_tmr_lock);
724 spin_lock_init(&dev->qf_cmd_lock);
725 sema_init(&dev->caw_sem, 1);
726 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
727 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
728 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
729 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
730 spin_lock_init(&dev->t10_pr.registration_lock);
731 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
732 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
733 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
734 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
735 spin_lock_init(&dev->t10_alua.lba_map_lock);
736
737 INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
738 mutex_init(&dev->lun_reset_mutex);
739
740 dev->t10_wwn.t10_dev = dev;
741 /*
742 * Use OpenFabrics IEEE Company ID: 00 14 05
743 */
744 dev->t10_wwn.company_id = 0x001405;
745
746 dev->t10_alua.t10_dev = dev;
747
748 dev->dev_attrib.da_dev = dev;
749 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
750 dev->dev_attrib.emulate_dpo = 1;
751 dev->dev_attrib.emulate_fua_write = 1;
752 dev->dev_attrib.emulate_fua_read = 1;
753 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
754 dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
755 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
756 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
757 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
758 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
759 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
760 dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
761 dev->dev_attrib.emulate_rsoc = DA_EMULATE_RSOC;
762 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
763 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
764 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
765 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
766 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
767 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
768 dev->dev_attrib.max_unmap_block_desc_count =
769 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
770 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
771 dev->dev_attrib.unmap_granularity_alignment =
772 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
773 dev->dev_attrib.unmap_zeroes_data =
774 DA_UNMAP_ZEROES_DATA_DEFAULT;
775 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
776 dev->dev_attrib.submit_type = TARGET_FABRIC_DEFAULT_SUBMIT;
777
778 xcopy_lun = &dev->xcopy_lun;
779 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
780 init_completion(&xcopy_lun->lun_shutdown_comp);
781 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
782 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
783 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
784 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
785
786 /* Preload the default INQUIRY const values */
787 strscpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
788 strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
789 sizeof(dev->t10_wwn.model));
790 strscpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
791 sizeof(dev->t10_wwn.revision));
792
793 return dev;
794 }
795
796 /*
797 * Check if the underlying struct block_device supports discard and if yes
798 * configure the UNMAP parameters.
799 */
target_configure_unmap_from_queue(struct se_dev_attrib * attrib,struct block_device * bdev)800 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
801 struct block_device *bdev)
802 {
803 int block_size = bdev_logical_block_size(bdev);
804
805 if (!bdev_max_discard_sectors(bdev))
806 return false;
807
808 attrib->max_unmap_lba_count =
809 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
810 /*
811 * Currently hardcoded to 1 in Linux/SCSI code..
812 */
813 attrib->max_unmap_block_desc_count = 1;
814 attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
815 attrib->unmap_granularity_alignment =
816 bdev_discard_alignment(bdev) / block_size;
817 return true;
818 }
819 EXPORT_SYMBOL(target_configure_unmap_from_queue);
820
821 /*
822 * Convert from blocksize advertised to the initiator to the 512 byte
823 * units unconditionally used by the Linux block layer.
824 */
target_to_linux_sector(struct se_device * dev,sector_t lb)825 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
826 {
827 switch (dev->dev_attrib.block_size) {
828 case 4096:
829 return lb << 3;
830 case 2048:
831 return lb << 2;
832 case 1024:
833 return lb << 1;
834 default:
835 return lb;
836 }
837 }
838 EXPORT_SYMBOL(target_to_linux_sector);
839
840 struct devices_idr_iter {
841 int (*fn)(struct se_device *dev, void *data);
842 void *data;
843 };
844
target_devices_idr_iter(int id,void * p,void * data)845 static int target_devices_idr_iter(int id, void *p, void *data)
846 __must_hold(&device_mutex)
847 {
848 struct devices_idr_iter *iter = data;
849 struct se_device *dev = p;
850 struct config_item *item;
851 int ret;
852
853 /*
854 * We add the device early to the idr, so it can be used
855 * by backend modules during configuration. We do not want
856 * to allow other callers to access partially setup devices,
857 * so we skip them here.
858 */
859 if (!target_dev_configured(dev))
860 return 0;
861
862 item = config_item_get_unless_zero(&dev->dev_group.cg_item);
863 if (!item)
864 return 0;
865 mutex_unlock(&device_mutex);
866
867 ret = iter->fn(dev, iter->data);
868 config_item_put(item);
869
870 mutex_lock(&device_mutex);
871 return ret;
872 }
873
874 /**
875 * target_for_each_device - iterate over configured devices
876 * @fn: iterator function
877 * @data: pointer to data that will be passed to fn
878 *
879 * fn must return 0 to continue looping over devices. non-zero will break
880 * from the loop and return that value to the caller.
881 */
target_for_each_device(int (* fn)(struct se_device * dev,void * data),void * data)882 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
883 void *data)
884 {
885 struct devices_idr_iter iter = { .fn = fn, .data = data };
886 int ret;
887
888 mutex_lock(&device_mutex);
889 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
890 mutex_unlock(&device_mutex);
891 return ret;
892 }
893
target_configure_device(struct se_device * dev)894 int target_configure_device(struct se_device *dev)
895 {
896 struct se_hba *hba = dev->se_hba;
897 int ret, id;
898
899 if (target_dev_configured(dev)) {
900 pr_err("se_dev->se_dev_ptr already set for storage"
901 " object\n");
902 return -EEXIST;
903 }
904
905 /*
906 * Add early so modules like tcmu can use during its
907 * configuration.
908 */
909 mutex_lock(&device_mutex);
910 /*
911 * Use cyclic to try and avoid collisions with devices
912 * that were recently removed.
913 */
914 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
915 mutex_unlock(&device_mutex);
916 if (id < 0) {
917 ret = -ENOMEM;
918 goto out;
919 }
920 dev->dev_index = id;
921
922 ret = dev->transport->configure_device(dev);
923 if (ret)
924 goto out_free_index;
925
926 if (dev->transport->configure_unmap &&
927 dev->transport->configure_unmap(dev)) {
928 pr_debug("Discard support available, but disabled by default.\n");
929 }
930
931 /*
932 * XXX: there is not much point to have two different values here..
933 */
934 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
935 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
936
937 /*
938 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
939 */
940 dev->dev_attrib.hw_max_sectors =
941 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
942 dev->dev_attrib.hw_block_size);
943 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
944
945 dev->creation_time = get_jiffies_64();
946
947 ret = core_setup_alua(dev);
948 if (ret)
949 goto out_destroy_device;
950
951 /*
952 * Setup work_queue for QUEUE_FULL
953 */
954 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
955
956 scsi_dump_inquiry(dev);
957
958 spin_lock(&hba->device_lock);
959 hba->dev_count++;
960 spin_unlock(&hba->device_lock);
961
962 dev->dev_flags |= DF_CONFIGURED;
963
964 return 0;
965
966 out_destroy_device:
967 dev->transport->destroy_device(dev);
968 out_free_index:
969 mutex_lock(&device_mutex);
970 idr_remove(&devices_idr, dev->dev_index);
971 mutex_unlock(&device_mutex);
972 out:
973 se_release_vpd_for_dev(dev);
974 return ret;
975 }
976
target_free_device(struct se_device * dev)977 void target_free_device(struct se_device *dev)
978 {
979 struct se_hba *hba = dev->se_hba;
980
981 WARN_ON(!list_empty(&dev->dev_sep_list));
982
983 if (target_dev_configured(dev)) {
984 dev->transport->destroy_device(dev);
985
986 mutex_lock(&device_mutex);
987 idr_remove(&devices_idr, dev->dev_index);
988 mutex_unlock(&device_mutex);
989
990 spin_lock(&hba->device_lock);
991 hba->dev_count--;
992 spin_unlock(&hba->device_lock);
993 }
994
995 core_alua_free_lu_gp_mem(dev);
996 core_alua_set_lba_map(dev, NULL, 0, 0);
997 core_scsi3_free_all_registrations(dev);
998 se_release_vpd_for_dev(dev);
999
1000 if (dev->transport->free_prot)
1001 dev->transport->free_prot(dev);
1002
1003 kfree(dev->queues);
1004 dev->transport->free_device(dev);
1005 }
1006
core_dev_setup_virtual_lun0(void)1007 int core_dev_setup_virtual_lun0(void)
1008 {
1009 struct se_hba *hba;
1010 struct se_device *dev;
1011 char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1012 int ret;
1013
1014 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1015 if (IS_ERR(hba))
1016 return PTR_ERR(hba);
1017
1018 dev = target_alloc_device(hba, "virt_lun0");
1019 if (!dev) {
1020 ret = -ENOMEM;
1021 goto out_free_hba;
1022 }
1023
1024 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1025
1026 ret = target_configure_device(dev);
1027 if (ret)
1028 goto out_free_se_dev;
1029
1030 lun0_hba = hba;
1031 g_lun0_dev = dev;
1032 return 0;
1033
1034 out_free_se_dev:
1035 target_free_device(dev);
1036 out_free_hba:
1037 core_delete_hba(hba);
1038 return ret;
1039 }
1040
1041
core_dev_release_virtual_lun0(void)1042 void core_dev_release_virtual_lun0(void)
1043 {
1044 struct se_hba *hba = lun0_hba;
1045
1046 if (!hba)
1047 return;
1048
1049 if (g_lun0_dev)
1050 target_free_device(g_lun0_dev);
1051 core_delete_hba(hba);
1052 }
1053
1054 /*
1055 * Common CDB parsing for kernel and user passthrough.
1056 */
1057 sense_reason_t
passthrough_parse_cdb(struct se_cmd * cmd,sense_reason_t (* exec_cmd)(struct se_cmd * cmd))1058 passthrough_parse_cdb(struct se_cmd *cmd,
1059 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1060 {
1061 unsigned char *cdb = cmd->t_task_cdb;
1062 struct se_device *dev = cmd->se_dev;
1063 unsigned int size;
1064
1065 /*
1066 * For REPORT LUNS we always need to emulate the response, for everything
1067 * else, pass it up.
1068 */
1069 if (cdb[0] == REPORT_LUNS) {
1070 cmd->execute_cmd = spc_emulate_report_luns;
1071 return TCM_NO_SENSE;
1072 }
1073
1074 /*
1075 * With emulate_pr disabled, all reservation requests should fail,
1076 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1077 */
1078 if (!dev->dev_attrib.emulate_pr &&
1079 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1080 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1081 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1082 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1083 return TCM_UNSUPPORTED_SCSI_OPCODE;
1084 }
1085
1086 /*
1087 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1088 * emulate the response, since tcmu does not have the information
1089 * required to process these commands.
1090 */
1091 if (!(dev->transport_flags &
1092 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1093 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1094 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1095 size = get_unaligned_be16(&cdb[7]);
1096 return target_cmd_size_check(cmd, size);
1097 }
1098 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1099 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1100 size = get_unaligned_be32(&cdb[5]);
1101 return target_cmd_size_check(cmd, size);
1102 }
1103
1104 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1105 cmd->execute_cmd = target_scsi2_reservation_release;
1106 if (cdb[0] == RELEASE_10)
1107 size = get_unaligned_be16(&cdb[7]);
1108 else
1109 size = cmd->data_length;
1110 return target_cmd_size_check(cmd, size);
1111 }
1112 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1113 cmd->execute_cmd = target_scsi2_reservation_reserve;
1114 if (cdb[0] == RESERVE_10)
1115 size = get_unaligned_be16(&cdb[7]);
1116 else
1117 size = cmd->data_length;
1118 return target_cmd_size_check(cmd, size);
1119 }
1120 }
1121
1122 /* Set DATA_CDB flag for ops that should have it */
1123 switch (cdb[0]) {
1124 case READ_6:
1125 case READ_10:
1126 case READ_12:
1127 case READ_16:
1128 case WRITE_6:
1129 case WRITE_10:
1130 case WRITE_12:
1131 case WRITE_16:
1132 case WRITE_VERIFY:
1133 case WRITE_VERIFY_12:
1134 case WRITE_VERIFY_16:
1135 case COMPARE_AND_WRITE:
1136 case XDWRITEREAD_10:
1137 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1138 break;
1139 case VARIABLE_LENGTH_CMD:
1140 switch (get_unaligned_be16(&cdb[8])) {
1141 case READ_32:
1142 case WRITE_32:
1143 case WRITE_VERIFY_32:
1144 case XDWRITEREAD_32:
1145 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1146 break;
1147 }
1148 }
1149
1150 cmd->execute_cmd = exec_cmd;
1151
1152 return TCM_NO_SENSE;
1153 }
1154 EXPORT_SYMBOL(passthrough_parse_cdb);
1155