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 LIST_HEAD(device_list);
41 static DEFINE_IDR(devices_idr);
42
43 static struct se_hba *lun0_hba;
44 /* not static, needed by tpg.c */
45 struct se_device *g_lun0_dev;
46
47 sense_reason_t
transport_lookup_cmd_lun(struct se_cmd * se_cmd)48 transport_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 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
69 deve->lun_access_ro) {
70 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
71 " Access for 0x%08llx\n",
72 se_cmd->se_tfo->fabric_name,
73 se_cmd->orig_fe_lun);
74 rcu_read_unlock();
75 return TCM_WRITE_PROTECTED;
76 }
77
78 se_lun = deve->se_lun;
79
80 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
81 se_lun = NULL;
82 goto out_unlock;
83 }
84
85 se_cmd->se_lun = se_lun;
86 se_cmd->pr_res_key = deve->pr_res_key;
87 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
88 se_cmd->lun_ref_active = true;
89 }
90 out_unlock:
91 rcu_read_unlock();
92
93 if (!se_lun) {
94 /*
95 * Use the se_portal_group->tpg_virt_lun0 to allow for
96 * REPORT_LUNS, et al to be returned when no active
97 * MappedLUN=0 exists for this Initiator Port.
98 */
99 if (se_cmd->orig_fe_lun != 0) {
100 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
101 " Access for 0x%08llx from %s\n",
102 se_cmd->se_tfo->fabric_name,
103 se_cmd->orig_fe_lun,
104 nacl->initiatorname);
105 return TCM_NON_EXISTENT_LUN;
106 }
107
108 /*
109 * Force WRITE PROTECT for virtual LUN 0
110 */
111 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
112 (se_cmd->data_direction != DMA_NONE))
113 return TCM_WRITE_PROTECTED;
114
115 se_lun = se_sess->se_tpg->tpg_virt_lun0;
116 if (!percpu_ref_tryget_live(&se_lun->lun_ref))
117 return TCM_NON_EXISTENT_LUN;
118
119 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
120 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
121 se_cmd->lun_ref_active = true;
122 }
123 /*
124 * RCU reference protected by percpu se_lun->lun_ref taken above that
125 * must drop to zero (including initial reference) before this se_lun
126 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
127 * target_core_fabric_configfs.c:target_fabric_port_release
128 */
129 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
130 atomic_long_inc(&se_cmd->se_dev->num_cmds);
131
132 if (se_cmd->data_direction == DMA_TO_DEVICE)
133 atomic_long_add(se_cmd->data_length,
134 &se_cmd->se_dev->write_bytes);
135 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
136 atomic_long_add(se_cmd->data_length,
137 &se_cmd->se_dev->read_bytes);
138
139 return ret;
140 }
141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
142
transport_lookup_tmr_lun(struct se_cmd * se_cmd)143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
144 {
145 struct se_dev_entry *deve;
146 struct se_lun *se_lun = NULL;
147 struct se_session *se_sess = se_cmd->se_sess;
148 struct se_node_acl *nacl = se_sess->se_node_acl;
149 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
150 unsigned long flags;
151
152 rcu_read_lock();
153 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
154 if (deve) {
155 se_lun = deve->se_lun;
156
157 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
158 se_lun = NULL;
159 goto out_unlock;
160 }
161
162 se_cmd->se_lun = se_lun;
163 se_cmd->pr_res_key = deve->pr_res_key;
164 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
165 se_cmd->lun_ref_active = true;
166 }
167 out_unlock:
168 rcu_read_unlock();
169
170 if (!se_lun) {
171 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
172 " Access for 0x%08llx for %s\n",
173 se_cmd->se_tfo->fabric_name,
174 se_cmd->orig_fe_lun,
175 nacl->initiatorname);
176 return -ENODEV;
177 }
178 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
179 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
180
181 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
182 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
183 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
184
185 return 0;
186 }
187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
188
target_lun_is_rdonly(struct se_cmd * cmd)189 bool target_lun_is_rdonly(struct se_cmd *cmd)
190 {
191 struct se_session *se_sess = cmd->se_sess;
192 struct se_dev_entry *deve;
193 bool ret;
194
195 rcu_read_lock();
196 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
197 ret = deve && deve->lun_access_ro;
198 rcu_read_unlock();
199
200 return ret;
201 }
202 EXPORT_SYMBOL(target_lun_is_rdonly);
203
204 /*
205 * This function is called from core_scsi3_emulate_pro_register_and_move()
206 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
207 * when a matching rtpi is found.
208 */
core_get_se_deve_from_rtpi(struct se_node_acl * nacl,u16 rtpi)209 struct se_dev_entry *core_get_se_deve_from_rtpi(
210 struct se_node_acl *nacl,
211 u16 rtpi)
212 {
213 struct se_dev_entry *deve;
214 struct se_lun *lun;
215 struct se_portal_group *tpg = nacl->se_tpg;
216
217 rcu_read_lock();
218 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
219 lun = deve->se_lun;
220 if (!lun) {
221 pr_err("%s device entries device pointer is"
222 " NULL, but Initiator has access.\n",
223 tpg->se_tpg_tfo->fabric_name);
224 continue;
225 }
226 if (lun->lun_rtpi != rtpi)
227 continue;
228
229 kref_get(&deve->pr_kref);
230 rcu_read_unlock();
231
232 return deve;
233 }
234 rcu_read_unlock();
235
236 return NULL;
237 }
238
core_free_device_list_for_node(struct se_node_acl * nacl,struct se_portal_group * tpg)239 void core_free_device_list_for_node(
240 struct se_node_acl *nacl,
241 struct se_portal_group *tpg)
242 {
243 struct se_dev_entry *deve;
244
245 mutex_lock(&nacl->lun_entry_mutex);
246 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
247 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
248 mutex_unlock(&nacl->lun_entry_mutex);
249 }
250
core_update_device_list_access(u64 mapped_lun,bool lun_access_ro,struct se_node_acl * nacl)251 void core_update_device_list_access(
252 u64 mapped_lun,
253 bool lun_access_ro,
254 struct se_node_acl *nacl)
255 {
256 struct se_dev_entry *deve;
257
258 mutex_lock(&nacl->lun_entry_mutex);
259 deve = target_nacl_find_deve(nacl, mapped_lun);
260 if (deve)
261 deve->lun_access_ro = lun_access_ro;
262 mutex_unlock(&nacl->lun_entry_mutex);
263 }
264
265 /*
266 * Called with rcu_read_lock or nacl->device_list_lock held.
267 */
target_nacl_find_deve(struct se_node_acl * nacl,u64 mapped_lun)268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
269 {
270 struct se_dev_entry *deve;
271
272 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
273 if (deve->mapped_lun == mapped_lun)
274 return deve;
275
276 return NULL;
277 }
278 EXPORT_SYMBOL(target_nacl_find_deve);
279
target_pr_kref_release(struct kref * kref)280 void target_pr_kref_release(struct kref *kref)
281 {
282 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
283 pr_kref);
284 complete(&deve->pr_comp);
285 }
286
287 /*
288 * Establish UA condition on SCSI device - all LUNs
289 */
target_dev_ua_allocate(struct se_device * dev,u8 asc,u8 ascq)290 void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
291 {
292 struct se_dev_entry *se_deve;
293 struct se_lun *lun;
294
295 spin_lock(&dev->se_port_lock);
296 list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
297
298 spin_lock(&lun->lun_deve_lock);
299 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
300 core_scsi3_ua_allocate(se_deve, asc, ascq);
301 spin_unlock(&lun->lun_deve_lock);
302 }
303 spin_unlock(&dev->se_port_lock);
304 }
305
306 static void
target_luns_data_has_changed(struct se_node_acl * nacl,struct se_dev_entry * new,bool skip_new)307 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
308 bool skip_new)
309 {
310 struct se_dev_entry *tmp;
311
312 rcu_read_lock();
313 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
314 if (skip_new && tmp == new)
315 continue;
316 core_scsi3_ua_allocate(tmp, 0x3F,
317 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
318 }
319 rcu_read_unlock();
320 }
321
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)322 int core_enable_device_list_for_node(
323 struct se_lun *lun,
324 struct se_lun_acl *lun_acl,
325 u64 mapped_lun,
326 bool lun_access_ro,
327 struct se_node_acl *nacl,
328 struct se_portal_group *tpg)
329 {
330 struct se_dev_entry *orig, *new;
331
332 new = kzalloc(sizeof(*new), GFP_KERNEL);
333 if (!new) {
334 pr_err("Unable to allocate se_dev_entry memory\n");
335 return -ENOMEM;
336 }
337
338 spin_lock_init(&new->ua_lock);
339 INIT_LIST_HEAD(&new->ua_list);
340 INIT_LIST_HEAD(&new->lun_link);
341
342 new->mapped_lun = mapped_lun;
343 kref_init(&new->pr_kref);
344 init_completion(&new->pr_comp);
345
346 new->lun_access_ro = lun_access_ro;
347 new->creation_time = get_jiffies_64();
348 new->attach_count++;
349
350 mutex_lock(&nacl->lun_entry_mutex);
351 orig = target_nacl_find_deve(nacl, mapped_lun);
352 if (orig && orig->se_lun) {
353 struct se_lun *orig_lun = orig->se_lun;
354
355 if (orig_lun != lun) {
356 pr_err("Existing orig->se_lun doesn't match new lun"
357 " for dynamic -> explicit NodeACL conversion:"
358 " %s\n", nacl->initiatorname);
359 mutex_unlock(&nacl->lun_entry_mutex);
360 kfree(new);
361 return -EINVAL;
362 }
363 if (orig->se_lun_acl != NULL) {
364 pr_warn_ratelimited("Detected existing explicit"
365 " se_lun_acl->se_lun_group reference for %s"
366 " mapped_lun: %llu, failing\n",
367 nacl->initiatorname, mapped_lun);
368 mutex_unlock(&nacl->lun_entry_mutex);
369 kfree(new);
370 return -EINVAL;
371 }
372
373 new->se_lun = lun;
374 new->se_lun_acl = lun_acl;
375 hlist_del_rcu(&orig->link);
376 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
377 mutex_unlock(&nacl->lun_entry_mutex);
378
379 spin_lock(&lun->lun_deve_lock);
380 list_del(&orig->lun_link);
381 list_add_tail(&new->lun_link, &lun->lun_deve_list);
382 spin_unlock(&lun->lun_deve_lock);
383
384 kref_put(&orig->pr_kref, target_pr_kref_release);
385 wait_for_completion(&orig->pr_comp);
386
387 target_luns_data_has_changed(nacl, new, true);
388 kfree_rcu(orig, rcu_head);
389 return 0;
390 }
391
392 new->se_lun = lun;
393 new->se_lun_acl = lun_acl;
394 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
395 mutex_unlock(&nacl->lun_entry_mutex);
396
397 spin_lock(&lun->lun_deve_lock);
398 list_add_tail(&new->lun_link, &lun->lun_deve_list);
399 spin_unlock(&lun->lun_deve_lock);
400
401 target_luns_data_has_changed(nacl, new, true);
402 return 0;
403 }
404
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)405 void 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 lockdep_assert_held(&nacl->lun_entry_mutex);
418
419 /*
420 * If the MappedLUN entry is being disabled, the entry in
421 * lun->lun_deve_list must be removed now before clearing the
422 * struct se_dev_entry pointers below as logic in
423 * core_alua_do_transition_tg_pt() depends on these being present.
424 *
425 * deve->se_lun_acl will be NULL for demo-mode created LUNs
426 * that have not been explicitly converted to MappedLUNs ->
427 * struct se_lun_acl, but we remove deve->lun_link from
428 * lun->lun_deve_list. This also means that active UAs and
429 * NodeACL context specific PR metadata for demo-mode
430 * MappedLUN *deve will be released below..
431 */
432 spin_lock(&lun->lun_deve_lock);
433 list_del(&orig->lun_link);
434 spin_unlock(&lun->lun_deve_lock);
435 /*
436 * Disable struct se_dev_entry LUN ACL mapping
437 */
438 core_scsi3_ua_release_all(orig);
439
440 hlist_del_rcu(&orig->link);
441 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
442 orig->lun_access_ro = false;
443 orig->creation_time = 0;
444 orig->attach_count--;
445 /*
446 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
447 * or REGISTER_AND_MOVE PR operation to complete.
448 */
449 kref_put(&orig->pr_kref, target_pr_kref_release);
450 wait_for_completion(&orig->pr_comp);
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 */
core_clear_lun_from_tpg(struct se_lun * lun,struct se_portal_group * tpg)462 void 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 if (lun != deve->se_lun)
473 continue;
474
475 core_disable_device_list_for_node(lun, deve, nacl, tpg);
476 }
477 mutex_unlock(&nacl->lun_entry_mutex);
478 }
479 mutex_unlock(&tpg->acl_node_mutex);
480 }
481
core_alloc_rtpi(struct se_lun * lun,struct se_device * dev)482 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
483 {
484 struct se_lun *tmp;
485
486 spin_lock(&dev->se_port_lock);
487 if (dev->export_count == 0x0000ffff) {
488 pr_warn("Reached dev->dev_port_count =="
489 " 0x0000ffff\n");
490 spin_unlock(&dev->se_port_lock);
491 return -ENOSPC;
492 }
493 again:
494 /*
495 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
496 * Here is the table from spc4r17 section 7.7.3.8.
497 *
498 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
499 *
500 * Code Description
501 * 0h Reserved
502 * 1h Relative port 1, historically known as port A
503 * 2h Relative port 2, historically known as port B
504 * 3h to FFFFh Relative port 3 through 65 535
505 */
506 lun->lun_rtpi = dev->dev_rpti_counter++;
507 if (!lun->lun_rtpi)
508 goto again;
509
510 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
511 /*
512 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
513 * for 16-bit wrap..
514 */
515 if (lun->lun_rtpi == tmp->lun_rtpi)
516 goto again;
517 }
518 spin_unlock(&dev->se_port_lock);
519
520 return 0;
521 }
522
se_release_vpd_for_dev(struct se_device * dev)523 static void se_release_vpd_for_dev(struct se_device *dev)
524 {
525 struct t10_vpd *vpd, *vpd_tmp;
526
527 spin_lock(&dev->t10_wwn.t10_vpd_lock);
528 list_for_each_entry_safe(vpd, vpd_tmp,
529 &dev->t10_wwn.t10_vpd_list, vpd_list) {
530 list_del(&vpd->vpd_list);
531 kfree(vpd);
532 }
533 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
534 }
535
se_dev_align_max_sectors(u32 max_sectors,u32 block_size)536 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
537 {
538 u32 aligned_max_sectors;
539 u32 alignment;
540 /*
541 * Limit max_sectors to a PAGE_SIZE aligned value for modern
542 * transport_allocate_data_tasks() operation.
543 */
544 alignment = max(1ul, PAGE_SIZE / block_size);
545 aligned_max_sectors = rounddown(max_sectors, alignment);
546
547 if (max_sectors != aligned_max_sectors)
548 pr_info("Rounding down aligned max_sectors from %u to %u\n",
549 max_sectors, aligned_max_sectors);
550
551 return aligned_max_sectors;
552 }
553
core_dev_add_lun(struct se_portal_group * tpg,struct se_device * dev,struct se_lun * lun)554 int core_dev_add_lun(
555 struct se_portal_group *tpg,
556 struct se_device *dev,
557 struct se_lun *lun)
558 {
559 int rc;
560
561 rc = core_tpg_add_lun(tpg, lun, false, dev);
562 if (rc < 0)
563 return rc;
564
565 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
566 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
567 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
568 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
569 /*
570 * Update LUN maps for dynamically added initiators when
571 * generate_node_acl is enabled.
572 */
573 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
574 struct se_node_acl *acl;
575
576 mutex_lock(&tpg->acl_node_mutex);
577 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
578 if (acl->dynamic_node_acl &&
579 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
580 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
581 core_tpg_add_node_to_devs(acl, tpg, lun);
582 }
583 }
584 mutex_unlock(&tpg->acl_node_mutex);
585 }
586
587 return 0;
588 }
589
590 /* core_dev_del_lun():
591 *
592 *
593 */
core_dev_del_lun(struct se_portal_group * tpg,struct se_lun * lun)594 void core_dev_del_lun(
595 struct se_portal_group *tpg,
596 struct se_lun *lun)
597 {
598 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
599 " device object\n", tpg->se_tpg_tfo->fabric_name,
600 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
601 tpg->se_tpg_tfo->fabric_name);
602
603 core_tpg_remove_lun(tpg, lun);
604 }
605
core_dev_init_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_node_acl * nacl,u64 mapped_lun,int * ret)606 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
607 struct se_portal_group *tpg,
608 struct se_node_acl *nacl,
609 u64 mapped_lun,
610 int *ret)
611 {
612 struct se_lun_acl *lacl;
613
614 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
615 pr_err("%s InitiatorName exceeds maximum size.\n",
616 tpg->se_tpg_tfo->fabric_name);
617 *ret = -EOVERFLOW;
618 return NULL;
619 }
620 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
621 if (!lacl) {
622 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
623 *ret = -ENOMEM;
624 return NULL;
625 }
626
627 lacl->mapped_lun = mapped_lun;
628 lacl->se_lun_nacl = nacl;
629
630 return lacl;
631 }
632
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)633 int core_dev_add_initiator_node_lun_acl(
634 struct se_portal_group *tpg,
635 struct se_lun_acl *lacl,
636 struct se_lun *lun,
637 bool lun_access_ro)
638 {
639 struct se_node_acl *nacl = lacl->se_lun_nacl;
640 /*
641 * rcu_dereference_raw protected by se_lun->lun_group symlink
642 * reference to se_device->dev_group.
643 */
644 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
645
646 if (!nacl)
647 return -EINVAL;
648
649 if (lun->lun_access_ro)
650 lun_access_ro = true;
651
652 lacl->se_lun = lun;
653
654 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
655 lun_access_ro, nacl, tpg) < 0)
656 return -EINVAL;
657
658 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
659 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
660 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
661 lun_access_ro ? "RO" : "RW",
662 nacl->initiatorname);
663 /*
664 * Check to see if there are any existing persistent reservation APTPL
665 * pre-registrations that need to be enabled for this LUN ACL..
666 */
667 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
668 lacl->mapped_lun);
669 return 0;
670 }
671
core_dev_del_initiator_node_lun_acl(struct se_lun * lun,struct se_lun_acl * lacl)672 int core_dev_del_initiator_node_lun_acl(
673 struct se_lun *lun,
674 struct se_lun_acl *lacl)
675 {
676 struct se_portal_group *tpg = lun->lun_tpg;
677 struct se_node_acl *nacl;
678 struct se_dev_entry *deve;
679
680 nacl = lacl->se_lun_nacl;
681 if (!nacl)
682 return -EINVAL;
683
684 mutex_lock(&nacl->lun_entry_mutex);
685 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
686 if (deve)
687 core_disable_device_list_for_node(lun, deve, nacl, tpg);
688 mutex_unlock(&nacl->lun_entry_mutex);
689
690 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
691 " InitiatorNode: %s Mapped LUN: %llu\n",
692 tpg->se_tpg_tfo->fabric_name,
693 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
694 nacl->initiatorname, lacl->mapped_lun);
695
696 return 0;
697 }
698
core_dev_free_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_lun_acl * lacl)699 void core_dev_free_initiator_node_lun_acl(
700 struct se_portal_group *tpg,
701 struct se_lun_acl *lacl)
702 {
703 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
704 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
705 tpg->se_tpg_tfo->tpg_get_tag(tpg),
706 tpg->se_tpg_tfo->fabric_name,
707 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
708
709 kfree(lacl);
710 }
711
scsi_dump_inquiry(struct se_device * dev)712 static void scsi_dump_inquiry(struct se_device *dev)
713 {
714 struct t10_wwn *wwn = &dev->t10_wwn;
715 int device_type = dev->transport->get_device_type(dev);
716
717 /*
718 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
719 */
720 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
721 wwn->vendor);
722 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
723 wwn->model);
724 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
725 wwn->revision);
726 pr_debug(" Type: %s ", scsi_device_type(device_type));
727 }
728
target_alloc_device(struct se_hba * hba,const char * name)729 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
730 {
731 struct se_device *dev;
732 struct se_lun *xcopy_lun;
733 int i;
734
735 dev = hba->backend->ops->alloc_device(hba, name);
736 if (!dev)
737 return NULL;
738
739 dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
740 if (!dev->queues) {
741 dev->transport->free_device(dev);
742 return NULL;
743 }
744
745 dev->queue_cnt = nr_cpu_ids;
746 for (i = 0; i < dev->queue_cnt; i++) {
747 struct se_device_queue *q;
748
749 q = &dev->queues[i];
750 INIT_LIST_HEAD(&q->state_list);
751 spin_lock_init(&q->lock);
752
753 init_llist_head(&q->sq.cmd_list);
754 INIT_WORK(&q->sq.work, target_queued_submit_work);
755 }
756
757 dev->se_hba = hba;
758 dev->transport = hba->backend->ops;
759 dev->transport_flags = dev->transport->transport_flags_default;
760 dev->prot_length = sizeof(struct t10_pi_tuple);
761 dev->hba_index = hba->hba_index;
762
763 INIT_LIST_HEAD(&dev->dev_sep_list);
764 INIT_LIST_HEAD(&dev->dev_tmr_list);
765 INIT_LIST_HEAD(&dev->delayed_cmd_list);
766 INIT_LIST_HEAD(&dev->qf_cmd_list);
767 spin_lock_init(&dev->delayed_cmd_lock);
768 spin_lock_init(&dev->dev_reservation_lock);
769 spin_lock_init(&dev->se_port_lock);
770 spin_lock_init(&dev->se_tmr_lock);
771 spin_lock_init(&dev->qf_cmd_lock);
772 sema_init(&dev->caw_sem, 1);
773 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
774 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
775 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
776 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
777 spin_lock_init(&dev->t10_pr.registration_lock);
778 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
779 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
780 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
781 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
782 spin_lock_init(&dev->t10_alua.lba_map_lock);
783
784 INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
785
786 dev->t10_wwn.t10_dev = dev;
787 /*
788 * Use OpenFabrics IEEE Company ID: 00 14 05
789 */
790 dev->t10_wwn.company_id = 0x001405;
791
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 = TARGET_UA_INTLCK_CTRL_CLEAR;
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.emulate_pr = DA_EMULATE_PR;
807 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
808 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
809 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
810 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
811 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
812 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
813 dev->dev_attrib.max_unmap_block_desc_count =
814 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
815 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
816 dev->dev_attrib.unmap_granularity_alignment =
817 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
818 dev->dev_attrib.unmap_zeroes_data =
819 DA_UNMAP_ZEROES_DATA_DEFAULT;
820 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
821
822 xcopy_lun = &dev->xcopy_lun;
823 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
824 init_completion(&xcopy_lun->lun_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 /* Preload the default INQUIRY const values */
831 strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
832 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
833 sizeof(dev->t10_wwn.model));
834 strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
835 sizeof(dev->t10_wwn.revision));
836
837 return dev;
838 }
839
840 /*
841 * Check if the underlying struct block_device supports discard and if yes
842 * configure the UNMAP parameters.
843 */
target_configure_unmap_from_queue(struct se_dev_attrib * attrib,struct block_device * bdev)844 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
845 struct block_device *bdev)
846 {
847 int block_size = bdev_logical_block_size(bdev);
848
849 if (!bdev_max_discard_sectors(bdev))
850 return false;
851
852 attrib->max_unmap_lba_count =
853 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
854 /*
855 * Currently hardcoded to 1 in Linux/SCSI code..
856 */
857 attrib->max_unmap_block_desc_count = 1;
858 attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
859 attrib->unmap_granularity_alignment =
860 bdev_discard_alignment(bdev) / block_size;
861 return true;
862 }
863 EXPORT_SYMBOL(target_configure_unmap_from_queue);
864
865 /*
866 * Convert from blocksize advertised to the initiator to the 512 byte
867 * units unconditionally used by the Linux block layer.
868 */
target_to_linux_sector(struct se_device * dev,sector_t lb)869 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
870 {
871 switch (dev->dev_attrib.block_size) {
872 case 4096:
873 return lb << 3;
874 case 2048:
875 return lb << 2;
876 case 1024:
877 return lb << 1;
878 default:
879 return lb;
880 }
881 }
882 EXPORT_SYMBOL(target_to_linux_sector);
883
884 struct devices_idr_iter {
885 struct config_item *prev_item;
886 int (*fn)(struct se_device *dev, void *data);
887 void *data;
888 };
889
target_devices_idr_iter(int id,void * p,void * data)890 static int target_devices_idr_iter(int id, void *p, void *data)
891 __must_hold(&device_mutex)
892 {
893 struct devices_idr_iter *iter = data;
894 struct se_device *dev = p;
895 int ret;
896
897 config_item_put(iter->prev_item);
898 iter->prev_item = NULL;
899
900 /*
901 * We add the device early to the idr, so it can be used
902 * by backend modules during configuration. We do not want
903 * to allow other callers to access partially setup devices,
904 * so we skip them here.
905 */
906 if (!target_dev_configured(dev))
907 return 0;
908
909 iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
910 if (!iter->prev_item)
911 return 0;
912 mutex_unlock(&device_mutex);
913
914 ret = iter->fn(dev, iter->data);
915
916 mutex_lock(&device_mutex);
917 return ret;
918 }
919
920 /**
921 * target_for_each_device - iterate over configured devices
922 * @fn: iterator function
923 * @data: pointer to data that will be passed to fn
924 *
925 * fn must return 0 to continue looping over devices. non-zero will break
926 * from the loop and return that value to the caller.
927 */
target_for_each_device(int (* fn)(struct se_device * dev,void * data),void * data)928 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
929 void *data)
930 {
931 struct devices_idr_iter iter = { .fn = fn, .data = data };
932 int ret;
933
934 mutex_lock(&device_mutex);
935 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
936 mutex_unlock(&device_mutex);
937 config_item_put(iter.prev_item);
938 return ret;
939 }
940
target_configure_device(struct se_device * dev)941 int target_configure_device(struct se_device *dev)
942 {
943 struct se_hba *hba = dev->se_hba;
944 int ret, id;
945
946 if (target_dev_configured(dev)) {
947 pr_err("se_dev->se_dev_ptr already set for storage"
948 " object\n");
949 return -EEXIST;
950 }
951
952 /*
953 * Add early so modules like tcmu can use during its
954 * configuration.
955 */
956 mutex_lock(&device_mutex);
957 /*
958 * Use cyclic to try and avoid collisions with devices
959 * that were recently removed.
960 */
961 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
962 mutex_unlock(&device_mutex);
963 if (id < 0) {
964 ret = -ENOMEM;
965 goto out;
966 }
967 dev->dev_index = id;
968
969 ret = dev->transport->configure_device(dev);
970 if (ret)
971 goto out_free_index;
972
973 if (dev->transport->configure_unmap &&
974 dev->transport->configure_unmap(dev)) {
975 pr_debug("Discard support available, but disabled by default.\n");
976 }
977
978 /*
979 * XXX: there is not much point to have two different values here..
980 */
981 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
982 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
983
984 /*
985 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
986 */
987 dev->dev_attrib.hw_max_sectors =
988 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
989 dev->dev_attrib.hw_block_size);
990 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
991
992 dev->creation_time = get_jiffies_64();
993
994 ret = core_setup_alua(dev);
995 if (ret)
996 goto out_destroy_device;
997
998 /*
999 * Setup work_queue for QUEUE_FULL
1000 */
1001 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1002
1003 scsi_dump_inquiry(dev);
1004
1005 spin_lock(&hba->device_lock);
1006 hba->dev_count++;
1007 spin_unlock(&hba->device_lock);
1008
1009 dev->dev_flags |= DF_CONFIGURED;
1010
1011 return 0;
1012
1013 out_destroy_device:
1014 dev->transport->destroy_device(dev);
1015 out_free_index:
1016 mutex_lock(&device_mutex);
1017 idr_remove(&devices_idr, dev->dev_index);
1018 mutex_unlock(&device_mutex);
1019 out:
1020 se_release_vpd_for_dev(dev);
1021 return ret;
1022 }
1023
target_free_device(struct se_device * dev)1024 void target_free_device(struct se_device *dev)
1025 {
1026 struct se_hba *hba = dev->se_hba;
1027
1028 WARN_ON(!list_empty(&dev->dev_sep_list));
1029
1030 if (target_dev_configured(dev)) {
1031 dev->transport->destroy_device(dev);
1032
1033 mutex_lock(&device_mutex);
1034 idr_remove(&devices_idr, dev->dev_index);
1035 mutex_unlock(&device_mutex);
1036
1037 spin_lock(&hba->device_lock);
1038 hba->dev_count--;
1039 spin_unlock(&hba->device_lock);
1040 }
1041
1042 core_alua_free_lu_gp_mem(dev);
1043 core_alua_set_lba_map(dev, NULL, 0, 0);
1044 core_scsi3_free_all_registrations(dev);
1045 se_release_vpd_for_dev(dev);
1046
1047 if (dev->transport->free_prot)
1048 dev->transport->free_prot(dev);
1049
1050 kfree(dev->queues);
1051 dev->transport->free_device(dev);
1052 }
1053
core_dev_setup_virtual_lun0(void)1054 int core_dev_setup_virtual_lun0(void)
1055 {
1056 struct se_hba *hba;
1057 struct se_device *dev;
1058 char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1059 int ret;
1060
1061 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1062 if (IS_ERR(hba))
1063 return PTR_ERR(hba);
1064
1065 dev = target_alloc_device(hba, "virt_lun0");
1066 if (!dev) {
1067 ret = -ENOMEM;
1068 goto out_free_hba;
1069 }
1070
1071 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1072
1073 ret = target_configure_device(dev);
1074 if (ret)
1075 goto out_free_se_dev;
1076
1077 lun0_hba = hba;
1078 g_lun0_dev = dev;
1079 return 0;
1080
1081 out_free_se_dev:
1082 target_free_device(dev);
1083 out_free_hba:
1084 core_delete_hba(hba);
1085 return ret;
1086 }
1087
1088
core_dev_release_virtual_lun0(void)1089 void core_dev_release_virtual_lun0(void)
1090 {
1091 struct se_hba *hba = lun0_hba;
1092
1093 if (!hba)
1094 return;
1095
1096 if (g_lun0_dev)
1097 target_free_device(g_lun0_dev);
1098 core_delete_hba(hba);
1099 }
1100
1101 /*
1102 * Common CDB parsing for kernel and user passthrough.
1103 */
1104 sense_reason_t
passthrough_parse_cdb(struct se_cmd * cmd,sense_reason_t (* exec_cmd)(struct se_cmd * cmd))1105 passthrough_parse_cdb(struct se_cmd *cmd,
1106 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1107 {
1108 unsigned char *cdb = cmd->t_task_cdb;
1109 struct se_device *dev = cmd->se_dev;
1110 unsigned int size;
1111
1112 /*
1113 * For REPORT LUNS we always need to emulate the response, for everything
1114 * else, pass it up.
1115 */
1116 if (cdb[0] == REPORT_LUNS) {
1117 cmd->execute_cmd = spc_emulate_report_luns;
1118 return TCM_NO_SENSE;
1119 }
1120
1121 /*
1122 * With emulate_pr disabled, all reservation requests should fail,
1123 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1124 */
1125 if (!dev->dev_attrib.emulate_pr &&
1126 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1127 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1128 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1129 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1130 return TCM_UNSUPPORTED_SCSI_OPCODE;
1131 }
1132
1133 /*
1134 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1135 * emulate the response, since tcmu does not have the information
1136 * required to process these commands.
1137 */
1138 if (!(dev->transport_flags &
1139 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1140 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1141 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1142 size = get_unaligned_be16(&cdb[7]);
1143 return target_cmd_size_check(cmd, size);
1144 }
1145 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1146 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1147 size = get_unaligned_be32(&cdb[5]);
1148 return target_cmd_size_check(cmd, size);
1149 }
1150
1151 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1152 cmd->execute_cmd = target_scsi2_reservation_release;
1153 if (cdb[0] == RELEASE_10)
1154 size = get_unaligned_be16(&cdb[7]);
1155 else
1156 size = cmd->data_length;
1157 return target_cmd_size_check(cmd, size);
1158 }
1159 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1160 cmd->execute_cmd = target_scsi2_reservation_reserve;
1161 if (cdb[0] == RESERVE_10)
1162 size = get_unaligned_be16(&cdb[7]);
1163 else
1164 size = cmd->data_length;
1165 return target_cmd_size_check(cmd, size);
1166 }
1167 }
1168
1169 /* Set DATA_CDB flag for ops that should have it */
1170 switch (cdb[0]) {
1171 case READ_6:
1172 case READ_10:
1173 case READ_12:
1174 case READ_16:
1175 case WRITE_6:
1176 case WRITE_10:
1177 case WRITE_12:
1178 case WRITE_16:
1179 case WRITE_VERIFY:
1180 case WRITE_VERIFY_12:
1181 case WRITE_VERIFY_16:
1182 case COMPARE_AND_WRITE:
1183 case XDWRITEREAD_10:
1184 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1185 break;
1186 case VARIABLE_LENGTH_CMD:
1187 switch (get_unaligned_be16(&cdb[8])) {
1188 case READ_32:
1189 case WRITE_32:
1190 case WRITE_VERIFY_32:
1191 case XDWRITEREAD_32:
1192 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1193 break;
1194 }
1195 }
1196
1197 cmd->execute_cmd = exec_cmd;
1198
1199 return TCM_NO_SENSE;
1200 }
1201 EXPORT_SYMBOL(passthrough_parse_cdb);
1202