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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / target / target_core_device.c
bloba4046ca6e60da85d5e0f489ae58981fd5ba45426
1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the TCM Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * (c) Copyright 2003-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
27 #include <linux/net.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/timer.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
34 #include <linux/in.h>
35 #include <linux/export.h>
36 #include <asm/unaligned.h>
37 #include <net/sock.h>
38 #include <net/tcp.h>
39 #include <scsi/scsi_common.h>
40 #include <scsi/scsi_proto.h>
41
42 #include <target/target_core_base.h>
43 #include <target/target_core_backend.h>
44 #include <target/target_core_fabric.h>
45
46 #include "target_core_internal.h"
47 #include "target_core_alua.h"
48 #include "target_core_pr.h"
49 #include "target_core_ua.h"
50
51 DEFINE_MUTEX(g_device_mutex);
52 LIST_HEAD(g_device_list);
53
54 static struct se_hba *lun0_hba;
55 /* not static, needed by tpg.c */
56 struct se_device *g_lun0_dev;
57
58 sense_reason_t
59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
60 {
61 struct se_lun *se_lun = NULL;
62 struct se_session *se_sess = se_cmd->se_sess;
63 struct se_node_acl *nacl = se_sess->se_node_acl;
64 struct se_dev_entry *deve;
65 sense_reason_t ret = TCM_NO_SENSE;
66
67 rcu_read_lock();
68 deve = target_nacl_find_deve(nacl, unpacked_lun);
69 if (deve) {
70 atomic_long_inc(&deve->total_cmds);
71
72 if (se_cmd->data_direction == DMA_TO_DEVICE)
73 atomic_long_add(se_cmd->data_length,
74 &deve->write_bytes);
75 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
76 atomic_long_add(se_cmd->data_length,
77 &deve->read_bytes);
78
79 se_lun = rcu_dereference(deve->se_lun);
80 se_cmd->se_lun = rcu_dereference(deve->se_lun);
81 se_cmd->pr_res_key = deve->pr_res_key;
82 se_cmd->orig_fe_lun = unpacked_lun;
83 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
84
85 percpu_ref_get(&se_lun->lun_ref);
86 se_cmd->lun_ref_active = true;
87
88 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
89 deve->lun_access_ro) {
90 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
91 " Access for 0x%08llx\n",
92 se_cmd->se_tfo->get_fabric_name(),
93 unpacked_lun);
94 rcu_read_unlock();
95 ret = TCM_WRITE_PROTECTED;
96 goto ref_dev;
97 }
98 }
99 rcu_read_unlock();
100
101 if (!se_lun) {
102 /*
103 * Use the se_portal_group->tpg_virt_lun0 to allow for
104 * REPORT_LUNS, et al to be returned when no active
105 * MappedLUN=0 exists for this Initiator Port.
106 */
107 if (unpacked_lun != 0) {
108 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
109 " Access for 0x%08llx\n",
110 se_cmd->se_tfo->get_fabric_name(),
111 unpacked_lun);
112 return TCM_NON_EXISTENT_LUN;
113 }
114
115 se_lun = se_sess->se_tpg->tpg_virt_lun0;
116 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
117 se_cmd->orig_fe_lun = 0;
118 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
119
120 percpu_ref_get(&se_lun->lun_ref);
121 se_cmd->lun_ref_active = true;
122
123 /*
124 * Force WRITE PROTECT for virtual LUN 0
125 */
126 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
127 (se_cmd->data_direction != DMA_NONE)) {
128 ret = TCM_WRITE_PROTECTED;
129 goto ref_dev;
130 }
131 }
132 /*
133 * RCU reference protected by percpu se_lun->lun_ref taken above that
134 * must drop to zero (including initial reference) before this se_lun
135 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
136 * target_core_fabric_configfs.c:target_fabric_port_release
137 */
138 ref_dev:
139 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
140 atomic_long_inc(&se_cmd->se_dev->num_cmds);
141
142 if (se_cmd->data_direction == DMA_TO_DEVICE)
143 atomic_long_add(se_cmd->data_length,
144 &se_cmd->se_dev->write_bytes);
145 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
146 atomic_long_add(se_cmd->data_length,
147 &se_cmd->se_dev->read_bytes);
148
149 return ret;
150 }
151 EXPORT_SYMBOL(transport_lookup_cmd_lun);
152
153 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
154 {
155 struct se_dev_entry *deve;
156 struct se_lun *se_lun = NULL;
157 struct se_session *se_sess = se_cmd->se_sess;
158 struct se_node_acl *nacl = se_sess->se_node_acl;
159 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
160 unsigned long flags;
161
162 rcu_read_lock();
163 deve = target_nacl_find_deve(nacl, unpacked_lun);
164 if (deve) {
165 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
166 se_cmd->se_lun = rcu_dereference(deve->se_lun);
167 se_lun = rcu_dereference(deve->se_lun);
168 se_cmd->pr_res_key = deve->pr_res_key;
169 se_cmd->orig_fe_lun = unpacked_lun;
170 }
171 rcu_read_unlock();
172
173 if (!se_lun) {
174 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
175 " Access for 0x%08llx\n",
176 se_cmd->se_tfo->get_fabric_name(),
177 unpacked_lun);
178 return -ENODEV;
179 }
180 /*
181 * XXX: Add percpu se_lun->lun_ref reference count for TMR
182 */
183 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
184 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
185
186 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
187 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
188 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
189
190 return 0;
191 }
192 EXPORT_SYMBOL(transport_lookup_tmr_lun);
193
194 bool target_lun_is_rdonly(struct se_cmd *cmd)
195 {
196 struct se_session *se_sess = cmd->se_sess;
197 struct se_dev_entry *deve;
198 bool ret;
199
200 rcu_read_lock();
201 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
202 ret = deve && deve->lun_access_ro;
203 rcu_read_unlock();
204
205 return ret;
206 }
207 EXPORT_SYMBOL(target_lun_is_rdonly);
208
209 /*
210 * This function is called from core_scsi3_emulate_pro_register_and_move()
211 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
212 * when a matching rtpi is found.
213 */
214 struct se_dev_entry *core_get_se_deve_from_rtpi(
215 struct se_node_acl *nacl,
216 u16 rtpi)
217 {
218 struct se_dev_entry *deve;
219 struct se_lun *lun;
220 struct se_portal_group *tpg = nacl->se_tpg;
221
222 rcu_read_lock();
223 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
224 lun = rcu_dereference(deve->se_lun);
225 if (!lun) {
226 pr_err("%s device entries device pointer is"
227 " NULL, but Initiator has access.\n",
228 tpg->se_tpg_tfo->get_fabric_name());
229 continue;
230 }
231 if (lun->lun_rtpi != rtpi)
232 continue;
233
234 kref_get(&deve->pr_kref);
235 rcu_read_unlock();
236
237 return deve;
238 }
239 rcu_read_unlock();
240
241 return NULL;
242 }
243
244 void core_free_device_list_for_node(
245 struct se_node_acl *nacl,
246 struct se_portal_group *tpg)
247 {
248 struct se_dev_entry *deve;
249
250 mutex_lock(&nacl->lun_entry_mutex);
251 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
252 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
253 lockdep_is_held(&nacl->lun_entry_mutex));
254 core_disable_device_list_for_node(lun, deve, nacl, tpg);
255 }
256 mutex_unlock(&nacl->lun_entry_mutex);
257 }
258
259 void core_update_device_list_access(
260 u64 mapped_lun,
261 bool lun_access_ro,
262 struct se_node_acl *nacl)
263 {
264 struct se_dev_entry *deve;
265
266 mutex_lock(&nacl->lun_entry_mutex);
267 deve = target_nacl_find_deve(nacl, mapped_lun);
268 if (deve)
269 deve->lun_access_ro = lun_access_ro;
270 mutex_unlock(&nacl->lun_entry_mutex);
271 }
272
273 /*
274 * Called with rcu_read_lock or nacl->device_list_lock held.
275 */
276 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
277 {
278 struct se_dev_entry *deve;
279
280 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
281 if (deve->mapped_lun == mapped_lun)
282 return deve;
283
284 return NULL;
285 }
286 EXPORT_SYMBOL(target_nacl_find_deve);
287
288 void target_pr_kref_release(struct kref *kref)
289 {
290 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
291 pr_kref);
292 complete(&deve->pr_comp);
293 }
294
295 static void
296 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
297 bool skip_new)
298 {
299 struct se_dev_entry *tmp;
300
301 rcu_read_lock();
302 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
303 if (skip_new && tmp == new)
304 continue;
305 core_scsi3_ua_allocate(tmp, 0x3F,
306 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
307 }
308 rcu_read_unlock();
309 }
310
311 int core_enable_device_list_for_node(
312 struct se_lun *lun,
313 struct se_lun_acl *lun_acl,
314 u64 mapped_lun,
315 bool lun_access_ro,
316 struct se_node_acl *nacl,
317 struct se_portal_group *tpg)
318 {
319 struct se_dev_entry *orig, *new;
320
321 new = kzalloc(sizeof(*new), GFP_KERNEL);
322 if (!new) {
323 pr_err("Unable to allocate se_dev_entry memory\n");
324 return -ENOMEM;
325 }
326
327 atomic_set(&new->ua_count, 0);
328 spin_lock_init(&new->ua_lock);
329 INIT_LIST_HEAD(&new->ua_list);
330 INIT_LIST_HEAD(&new->lun_link);
331
332 new->mapped_lun = mapped_lun;
333 kref_init(&new->pr_kref);
334 init_completion(&new->pr_comp);
335
336 new->lun_access_ro = lun_access_ro;
337 new->creation_time = get_jiffies_64();
338 new->attach_count++;
339
340 mutex_lock(&nacl->lun_entry_mutex);
341 orig = target_nacl_find_deve(nacl, mapped_lun);
342 if (orig && orig->se_lun) {
343 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
344 lockdep_is_held(&nacl->lun_entry_mutex));
345
346 if (orig_lun != lun) {
347 pr_err("Existing orig->se_lun doesn't match new lun"
348 " for dynamic -> explicit NodeACL conversion:"
349 " %s\n", nacl->initiatorname);
350 mutex_unlock(&nacl->lun_entry_mutex);
351 kfree(new);
352 return -EINVAL;
353 }
354 BUG_ON(orig->se_lun_acl != NULL);
355
356 rcu_assign_pointer(new->se_lun, lun);
357 rcu_assign_pointer(new->se_lun_acl, lun_acl);
358 hlist_del_rcu(&orig->link);
359 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
360 mutex_unlock(&nacl->lun_entry_mutex);
361
362 spin_lock(&lun->lun_deve_lock);
363 list_del(&orig->lun_link);
364 list_add_tail(&new->lun_link, &lun->lun_deve_list);
365 spin_unlock(&lun->lun_deve_lock);
366
367 kref_put(&orig->pr_kref, target_pr_kref_release);
368 wait_for_completion(&orig->pr_comp);
369
370 target_luns_data_has_changed(nacl, new, true);
371 kfree_rcu(orig, rcu_head);
372 return 0;
373 }
374
375 rcu_assign_pointer(new->se_lun, lun);
376 rcu_assign_pointer(new->se_lun_acl, lun_acl);
377 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
378 mutex_unlock(&nacl->lun_entry_mutex);
379
380 spin_lock(&lun->lun_deve_lock);
381 list_add_tail(&new->lun_link, &lun->lun_deve_list);
382 spin_unlock(&lun->lun_deve_lock);
383
384 target_luns_data_has_changed(nacl, new, true);
385 return 0;
386 }
387
388 /*
389 * Called with se_node_acl->lun_entry_mutex held.
390 */
391 void core_disable_device_list_for_node(
392 struct se_lun *lun,
393 struct se_dev_entry *orig,
394 struct se_node_acl *nacl,
395 struct se_portal_group *tpg)
396 {
397 /*
398 * rcu_dereference_raw protected by se_lun->lun_group symlink
399 * reference to se_device->dev_group.
400 */
401 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
402 /*
403 * If the MappedLUN entry is being disabled, the entry in
404 * lun->lun_deve_list must be removed now before clearing the
405 * struct se_dev_entry pointers below as logic in
406 * core_alua_do_transition_tg_pt() depends on these being present.
407 *
408 * deve->se_lun_acl will be NULL for demo-mode created LUNs
409 * that have not been explicitly converted to MappedLUNs ->
410 * struct se_lun_acl, but we remove deve->lun_link from
411 * lun->lun_deve_list. This also means that active UAs and
412 * NodeACL context specific PR metadata for demo-mode
413 * MappedLUN *deve will be released below..
414 */
415 spin_lock(&lun->lun_deve_lock);
416 list_del(&orig->lun_link);
417 spin_unlock(&lun->lun_deve_lock);
418 /*
419 * Disable struct se_dev_entry LUN ACL mapping
420 */
421 core_scsi3_ua_release_all(orig);
422
423 hlist_del_rcu(&orig->link);
424 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
425 orig->lun_access_ro = false;
426 orig->creation_time = 0;
427 orig->attach_count--;
428 /*
429 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
430 * or REGISTER_AND_MOVE PR operation to complete.
431 */
432 kref_put(&orig->pr_kref, target_pr_kref_release);
433 wait_for_completion(&orig->pr_comp);
434
435 rcu_assign_pointer(orig->se_lun, NULL);
436 rcu_assign_pointer(orig->se_lun_acl, NULL);
437
438 kfree_rcu(orig, rcu_head);
439
440 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
441 target_luns_data_has_changed(nacl, NULL, false);
442 }
443
444 /* core_clear_lun_from_tpg():
445 *
446 *
447 */
448 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
449 {
450 struct se_node_acl *nacl;
451 struct se_dev_entry *deve;
452
453 mutex_lock(&tpg->acl_node_mutex);
454 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
455
456 mutex_lock(&nacl->lun_entry_mutex);
457 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
458 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
459 lockdep_is_held(&nacl->lun_entry_mutex));
460
461 if (lun != tmp_lun)
462 continue;
463
464 core_disable_device_list_for_node(lun, deve, nacl, tpg);
465 }
466 mutex_unlock(&nacl->lun_entry_mutex);
467 }
468 mutex_unlock(&tpg->acl_node_mutex);
469 }
470
471 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
472 {
473 struct se_lun *tmp;
474
475 spin_lock(&dev->se_port_lock);
476 if (dev->export_count == 0x0000ffff) {
477 pr_warn("Reached dev->dev_port_count =="
478 " 0x0000ffff\n");
479 spin_unlock(&dev->se_port_lock);
480 return -ENOSPC;
481 }
482 again:
483 /*
484 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
485 * Here is the table from spc4r17 section 7.7.3.8.
486 *
487 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
488 *
489 * Code Description
490 * 0h Reserved
491 * 1h Relative port 1, historically known as port A
492 * 2h Relative port 2, historically known as port B
493 * 3h to FFFFh Relative port 3 through 65 535
494 */
495 lun->lun_rtpi = dev->dev_rpti_counter++;
496 if (!lun->lun_rtpi)
497 goto again;
498
499 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
500 /*
501 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
502 * for 16-bit wrap..
503 */
504 if (lun->lun_rtpi == tmp->lun_rtpi)
505 goto again;
506 }
507 spin_unlock(&dev->se_port_lock);
508
509 return 0;
510 }
511
512 static void se_release_vpd_for_dev(struct se_device *dev)
513 {
514 struct t10_vpd *vpd, *vpd_tmp;
515
516 spin_lock(&dev->t10_wwn.t10_vpd_lock);
517 list_for_each_entry_safe(vpd, vpd_tmp,
518 &dev->t10_wwn.t10_vpd_list, vpd_list) {
519 list_del(&vpd->vpd_list);
520 kfree(vpd);
521 }
522 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
523 }
524
525 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
526 {
527 u32 aligned_max_sectors;
528 u32 alignment;
529 /*
530 * Limit max_sectors to a PAGE_SIZE aligned value for modern
531 * transport_allocate_data_tasks() operation.
532 */
533 alignment = max(1ul, PAGE_SIZE / block_size);
534 aligned_max_sectors = rounddown(max_sectors, alignment);
535
536 if (max_sectors != aligned_max_sectors)
537 pr_info("Rounding down aligned max_sectors from %u to %u\n",
538 max_sectors, aligned_max_sectors);
539
540 return aligned_max_sectors;
541 }
542
543 int core_dev_add_lun(
544 struct se_portal_group *tpg,
545 struct se_device *dev,
546 struct se_lun *lun)
547 {
548 int rc;
549
550 rc = core_tpg_add_lun(tpg, lun, false, dev);
551 if (rc < 0)
552 return rc;
553
554 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
555 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
556 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
557 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
558 /*
559 * Update LUN maps for dynamically added initiators when
560 * generate_node_acl is enabled.
561 */
562 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
563 struct se_node_acl *acl;
564
565 mutex_lock(&tpg->acl_node_mutex);
566 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
567 if (acl->dynamic_node_acl &&
568 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
569 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
570 core_tpg_add_node_to_devs(acl, tpg, lun);
571 }
572 }
573 mutex_unlock(&tpg->acl_node_mutex);
574 }
575
576 return 0;
577 }
578
579 /* core_dev_del_lun():
580 *
581 *
582 */
583 void core_dev_del_lun(
584 struct se_portal_group *tpg,
585 struct se_lun *lun)
586 {
587 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
588 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
589 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
590 tpg->se_tpg_tfo->get_fabric_name());
591
592 core_tpg_remove_lun(tpg, lun);
593 }
594
595 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
596 struct se_portal_group *tpg,
597 struct se_node_acl *nacl,
598 u64 mapped_lun,
599 int *ret)
600 {
601 struct se_lun_acl *lacl;
602
603 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
604 pr_err("%s InitiatorName exceeds maximum size.\n",
605 tpg->se_tpg_tfo->get_fabric_name());
606 *ret = -EOVERFLOW;
607 return NULL;
608 }
609 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
610 if (!lacl) {
611 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
612 *ret = -ENOMEM;
613 return NULL;
614 }
615
616 lacl->mapped_lun = mapped_lun;
617 lacl->se_lun_nacl = nacl;
618
619 return lacl;
620 }
621
622 int core_dev_add_initiator_node_lun_acl(
623 struct se_portal_group *tpg,
624 struct se_lun_acl *lacl,
625 struct se_lun *lun,
626 bool lun_access_ro)
627 {
628 struct se_node_acl *nacl = lacl->se_lun_nacl;
629 /*
630 * rcu_dereference_raw protected by se_lun->lun_group symlink
631 * reference to se_device->dev_group.
632 */
633 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
634
635 if (!nacl)
636 return -EINVAL;
637
638 if (lun->lun_access_ro)
639 lun_access_ro = true;
640
641 lacl->se_lun = lun;
642
643 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
644 lun_access_ro, nacl, tpg) < 0)
645 return -EINVAL;
646
647 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
648 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
649 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
650 lun_access_ro ? "RO" : "RW",
651 nacl->initiatorname);
652 /*
653 * Check to see if there are any existing persistent reservation APTPL
654 * pre-registrations that need to be enabled for this LUN ACL..
655 */
656 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
657 lacl->mapped_lun);
658 return 0;
659 }
660
661 int core_dev_del_initiator_node_lun_acl(
662 struct se_lun *lun,
663 struct se_lun_acl *lacl)
664 {
665 struct se_portal_group *tpg = lun->lun_tpg;
666 struct se_node_acl *nacl;
667 struct se_dev_entry *deve;
668
669 nacl = lacl->se_lun_nacl;
670 if (!nacl)
671 return -EINVAL;
672
673 mutex_lock(&nacl->lun_entry_mutex);
674 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
675 if (deve)
676 core_disable_device_list_for_node(lun, deve, nacl, tpg);
677 mutex_unlock(&nacl->lun_entry_mutex);
678
679 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
680 " InitiatorNode: %s Mapped LUN: %llu\n",
681 tpg->se_tpg_tfo->get_fabric_name(),
682 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
683 nacl->initiatorname, lacl->mapped_lun);
684
685 return 0;
686 }
687
688 void core_dev_free_initiator_node_lun_acl(
689 struct se_portal_group *tpg,
690 struct se_lun_acl *lacl)
691 {
692 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
693 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
694 tpg->se_tpg_tfo->tpg_get_tag(tpg),
695 tpg->se_tpg_tfo->get_fabric_name(),
696 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
697
698 kfree(lacl);
699 }
700
701 static void scsi_dump_inquiry(struct se_device *dev)
702 {
703 struct t10_wwn *wwn = &dev->t10_wwn;
704 char buf[17];
705 int i, device_type;
706 /*
707 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
708 */
709 for (i = 0; i < 8; i++)
710 if (wwn->vendor[i] >= 0x20)
711 buf[i] = wwn->vendor[i];
712 else
713 buf[i] = ' ';
714 buf[i] = '\0';
715 pr_debug(" Vendor: %s\n", buf);
716
717 for (i = 0; i < 16; i++)
718 if (wwn->model[i] >= 0x20)
719 buf[i] = wwn->model[i];
720 else
721 buf[i] = ' ';
722 buf[i] = '\0';
723 pr_debug(" Model: %s\n", buf);
724
725 for (i = 0; i < 4; i++)
726 if (wwn->revision[i] >= 0x20)
727 buf[i] = wwn->revision[i];
728 else
729 buf[i] = ' ';
730 buf[i] = '\0';
731 pr_debug(" Revision: %s\n", buf);
732
733 device_type = dev->transport->get_device_type(dev);
734 pr_debug(" Type: %s ", scsi_device_type(device_type));
735 }
736
737 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
738 {
739 struct se_device *dev;
740 struct se_lun *xcopy_lun;
741
742 dev = hba->backend->ops->alloc_device(hba, name);
743 if (!dev)
744 return NULL;
745
746 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
747 dev->se_hba = hba;
748 dev->transport = hba->backend->ops;
749 dev->prot_length = sizeof(struct t10_pi_tuple);
750 dev->hba_index = hba->hba_index;
751
752 INIT_LIST_HEAD(&dev->dev_list);
753 INIT_LIST_HEAD(&dev->dev_sep_list);
754 INIT_LIST_HEAD(&dev->dev_tmr_list);
755 INIT_LIST_HEAD(&dev->delayed_cmd_list);
756 INIT_LIST_HEAD(&dev->state_list);
757 INIT_LIST_HEAD(&dev->qf_cmd_list);
758 INIT_LIST_HEAD(&dev->g_dev_node);
759 spin_lock_init(&dev->execute_task_lock);
760 spin_lock_init(&dev->delayed_cmd_lock);
761 spin_lock_init(&dev->dev_reservation_lock);
762 spin_lock_init(&dev->se_port_lock);
763 spin_lock_init(&dev->se_tmr_lock);
764 spin_lock_init(&dev->qf_cmd_lock);
765 sema_init(&dev->caw_sem, 1);
766 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
767 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
768 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
769 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
770 spin_lock_init(&dev->t10_pr.registration_lock);
771 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
772 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
773 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
774 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
775 spin_lock_init(&dev->t10_alua.lba_map_lock);
776
777 dev->t10_wwn.t10_dev = dev;
778 dev->t10_alua.t10_dev = dev;
779
780 dev->dev_attrib.da_dev = dev;
781 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
782 dev->dev_attrib.emulate_dpo = 1;
783 dev->dev_attrib.emulate_fua_write = 1;
784 dev->dev_attrib.emulate_fua_read = 1;
785 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
786 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
787 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
788 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
789 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
790 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
791 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
792 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
793 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
794 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
795 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
796 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
797 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
798 dev->dev_attrib.max_unmap_block_desc_count =
799 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
800 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
801 dev->dev_attrib.unmap_granularity_alignment =
802 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
803 dev->dev_attrib.unmap_zeroes_data =
804 DA_UNMAP_ZEROES_DATA_DEFAULT;
805 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
806
807 xcopy_lun = &dev->xcopy_lun;
808 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
809 init_completion(&xcopy_lun->lun_ref_comp);
810 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
811 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
812 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
813 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
814
815 return dev;
816 }
817
818 /*
819 * Check if the underlying struct block_device request_queue supports
820 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
821 * in ATA and we need to set TPE=1
822 */
823 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
824 struct request_queue *q, int block_size)
825 {
826 if (!blk_queue_discard(q))
827 return false;
828
829 attrib->max_unmap_lba_count = (q->limits.max_discard_sectors << 9) /
830 block_size;
831 /*
832 * Currently hardcoded to 1 in Linux/SCSI code..
833 */
834 attrib->max_unmap_block_desc_count = 1;
835 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
836 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
837 block_size;
838 attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
839 return true;
840 }
841 EXPORT_SYMBOL(target_configure_unmap_from_queue);
842
843 /*
844 * Convert from blocksize advertised to the initiator to the 512 byte
845 * units unconditionally used by the Linux block layer.
846 */
847 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
848 {
849 switch (dev->dev_attrib.block_size) {
850 case 4096:
851 return lb << 3;
852 case 2048:
853 return lb << 2;
854 case 1024:
855 return lb << 1;
856 default:
857 return lb;
858 }
859 }
860 EXPORT_SYMBOL(target_to_linux_sector);
861
862 int target_configure_device(struct se_device *dev)
863 {
864 struct se_hba *hba = dev->se_hba;
865 int ret;
866
867 if (dev->dev_flags & DF_CONFIGURED) {
868 pr_err("se_dev->se_dev_ptr already set for storage"
869 " object\n");
870 return -EEXIST;
871 }
872
873 ret = dev->transport->configure_device(dev);
874 if (ret)
875 goto out;
876 /*
877 * XXX: there is not much point to have two different values here..
878 */
879 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
880 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
881
882 /*
883 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
884 */
885 dev->dev_attrib.hw_max_sectors =
886 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
887 dev->dev_attrib.hw_block_size);
888 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
889
890 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
891 dev->creation_time = get_jiffies_64();
892
893 ret = core_setup_alua(dev);
894 if (ret)
895 goto out;
896
897 /*
898 * Startup the struct se_device processing thread
899 */
900 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
901 dev->transport->name);
902 if (!dev->tmr_wq) {
903 pr_err("Unable to create tmr workqueue for %s\n",
904 dev->transport->name);
905 ret = -ENOMEM;
906 goto out_free_alua;
907 }
908
909 /*
910 * Setup work_queue for QUEUE_FULL
911 */
912 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
913
914 /*
915 * Preload the initial INQUIRY const values if we are doing
916 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
917 * passthrough because this is being provided by the backend LLD.
918 */
919 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
920 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
921 strncpy(&dev->t10_wwn.model[0],
922 dev->transport->inquiry_prod, 16);
923 strncpy(&dev->t10_wwn.revision[0],
924 dev->transport->inquiry_rev, 4);
925 }
926
927 scsi_dump_inquiry(dev);
928
929 spin_lock(&hba->device_lock);
930 hba->dev_count++;
931 spin_unlock(&hba->device_lock);
932
933 mutex_lock(&g_device_mutex);
934 list_add_tail(&dev->g_dev_node, &g_device_list);
935 mutex_unlock(&g_device_mutex);
936
937 dev->dev_flags |= DF_CONFIGURED;
938
939 return 0;
940
941 out_free_alua:
942 core_alua_free_lu_gp_mem(dev);
943 out:
944 se_release_vpd_for_dev(dev);
945 return ret;
946 }
947
948 void target_free_device(struct se_device *dev)
949 {
950 struct se_hba *hba = dev->se_hba;
951
952 WARN_ON(!list_empty(&dev->dev_sep_list));
953
954 if (dev->dev_flags & DF_CONFIGURED) {
955 destroy_workqueue(dev->tmr_wq);
956
957 mutex_lock(&g_device_mutex);
958 list_del(&dev->g_dev_node);
959 mutex_unlock(&g_device_mutex);
960
961 spin_lock(&hba->device_lock);
962 hba->dev_count--;
963 spin_unlock(&hba->device_lock);
964 }
965
966 core_alua_free_lu_gp_mem(dev);
967 core_alua_set_lba_map(dev, NULL, 0, 0);
968 core_scsi3_free_all_registrations(dev);
969 se_release_vpd_for_dev(dev);
970
971 if (dev->transport->free_prot)
972 dev->transport->free_prot(dev);
973
974 dev->transport->free_device(dev);
975 }
976
977 int core_dev_setup_virtual_lun0(void)
978 {
979 struct se_hba *hba;
980 struct se_device *dev;
981 char buf[] = "rd_pages=8,rd_nullio=1";
982 int ret;
983
984 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
985 if (IS_ERR(hba))
986 return PTR_ERR(hba);
987
988 dev = target_alloc_device(hba, "virt_lun0");
989 if (!dev) {
990 ret = -ENOMEM;
991 goto out_free_hba;
992 }
993
994 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
995
996 ret = target_configure_device(dev);
997 if (ret)
998 goto out_free_se_dev;
999
1000 lun0_hba = hba;
1001 g_lun0_dev = dev;
1002 return 0;
1003
1004 out_free_se_dev:
1005 target_free_device(dev);
1006 out_free_hba:
1007 core_delete_hba(hba);
1008 return ret;
1009 }
1010
1011
1012 void core_dev_release_virtual_lun0(void)
1013 {
1014 struct se_hba *hba = lun0_hba;
1015
1016 if (!hba)
1017 return;
1018
1019 if (g_lun0_dev)
1020 target_free_device(g_lun0_dev);
1021 core_delete_hba(hba);
1022 }
1023
1024 /*
1025 * Common CDB parsing for kernel and user passthrough.
1026 */
1027 sense_reason_t
1028 passthrough_parse_cdb(struct se_cmd *cmd,
1029 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1030 {
1031 unsigned char *cdb = cmd->t_task_cdb;
1032
1033 /*
1034 * Clear a lun set in the cdb if the initiator talking to use spoke
1035 * and old standards version, as we can't assume the underlying device
1036 * won't choke up on it.
1037 */
1038 switch (cdb[0]) {
1039 case READ_10: /* SBC - RDProtect */
1040 case READ_12: /* SBC - RDProtect */
1041 case READ_16: /* SBC - RDProtect */
1042 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1043 case VERIFY: /* SBC - VRProtect */
1044 case VERIFY_16: /* SBC - VRProtect */
1045 case WRITE_VERIFY: /* SBC - VRProtect */
1046 case WRITE_VERIFY_12: /* SBC - VRProtect */
1047 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1048 break;
1049 default:
1050 cdb[1] &= 0x1f; /* clear logical unit number */
1051 break;
1052 }
1053
1054 /*
1055 * For REPORT LUNS we always need to emulate the response, for everything
1056 * else, pass it up.
1057 */
1058 if (cdb[0] == REPORT_LUNS) {
1059 cmd->execute_cmd = spc_emulate_report_luns;
1060 return TCM_NO_SENSE;
1061 }
1062
1063 /* Set DATA_CDB flag for ops that should have it */
1064 switch (cdb[0]) {
1065 case READ_6:
1066 case READ_10:
1067 case READ_12:
1068 case READ_16:
1069 case WRITE_6:
1070 case WRITE_10:
1071 case WRITE_12:
1072 case WRITE_16:
1073 case WRITE_VERIFY:
1074 case WRITE_VERIFY_12:
1075 case 0x8e: /* WRITE_VERIFY_16 */
1076 case COMPARE_AND_WRITE:
1077 case XDWRITEREAD_10:
1078 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1079 break;
1080 case VARIABLE_LENGTH_CMD:
1081 switch (get_unaligned_be16(&cdb[8])) {
1082 case READ_32:
1083 case WRITE_32:
1084 case 0x0c: /* WRITE_VERIFY_32 */
1085 case XDWRITEREAD_32:
1086 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1087 break;
1088 }
1089 }
1090
1091 cmd->execute_cmd = exec_cmd;
1092
1093 return TCM_NO_SENSE;
1094 }
1095 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support