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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blob1ebd13ef7bd333c5cbc488f7543eda58e29a2123
1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the TCM Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * (c) Copyright 2003-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
27 #include <linux/net.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/timer.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
34 #include <linux/in.h>
35 #include <linux/export.h>
36 #include <linux/t10-pi.h>
37 #include <asm/unaligned.h>
38 #include <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi_common.h>
41 #include <scsi/scsi_proto.h>
42
43 #include <target/target_core_base.h>
44 #include <target/target_core_backend.h>
45 #include <target/target_core_fabric.h>
46
47 #include "target_core_internal.h"
48 #include "target_core_alua.h"
49 #include "target_core_pr.h"
50 #include "target_core_ua.h"
51
52 DEFINE_MUTEX(g_device_mutex);
53 LIST_HEAD(g_device_list);
54
55 static struct se_hba *lun0_hba;
56 /* not static, needed by tpg.c */
57 struct se_device *g_lun0_dev;
58
59 sense_reason_t
60 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
61 {
62 struct se_lun *se_lun = NULL;
63 struct se_session *se_sess = se_cmd->se_sess;
64 struct se_node_acl *nacl = se_sess->se_node_acl;
65 struct se_dev_entry *deve;
66 sense_reason_t ret = TCM_NO_SENSE;
67
68 rcu_read_lock();
69 deve = target_nacl_find_deve(nacl, unpacked_lun);
70 if (deve) {
71 atomic_long_inc(&deve->total_cmds);
72
73 if (se_cmd->data_direction == DMA_TO_DEVICE)
74 atomic_long_add(se_cmd->data_length,
75 &deve->write_bytes);
76 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
77 atomic_long_add(se_cmd->data_length,
78 &deve->read_bytes);
79
80 se_lun = rcu_dereference(deve->se_lun);
81 se_cmd->se_lun = rcu_dereference(deve->se_lun);
82 se_cmd->pr_res_key = deve->pr_res_key;
83 se_cmd->orig_fe_lun = unpacked_lun;
84 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
85
86 percpu_ref_get(&se_lun->lun_ref);
87 se_cmd->lun_ref_active = true;
88
89 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
90 deve->lun_access_ro) {
91 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
92 " Access for 0x%08llx\n",
93 se_cmd->se_tfo->get_fabric_name(),
94 unpacked_lun);
95 rcu_read_unlock();
96 ret = TCM_WRITE_PROTECTED;
97 goto ref_dev;
98 }
99 }
100 rcu_read_unlock();
101
102 if (!se_lun) {
103 /*
104 * Use the se_portal_group->tpg_virt_lun0 to allow for
105 * REPORT_LUNS, et al to be returned when no active
106 * MappedLUN=0 exists for this Initiator Port.
107 */
108 if (unpacked_lun != 0) {
109 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
110 " Access for 0x%08llx\n",
111 se_cmd->se_tfo->get_fabric_name(),
112 unpacked_lun);
113 return TCM_NON_EXISTENT_LUN;
114 }
115
116 se_lun = se_sess->se_tpg->tpg_virt_lun0;
117 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
118 se_cmd->orig_fe_lun = 0;
119 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
120
121 percpu_ref_get(&se_lun->lun_ref);
122 se_cmd->lun_ref_active = true;
123
124 /*
125 * Force WRITE PROTECT for virtual LUN 0
126 */
127 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
128 (se_cmd->data_direction != DMA_NONE)) {
129 ret = TCM_WRITE_PROTECTED;
130 goto ref_dev;
131 }
132 }
133 /*
134 * RCU reference protected by percpu se_lun->lun_ref taken above that
135 * must drop to zero (including initial reference) before this se_lun
136 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
137 * target_core_fabric_configfs.c:target_fabric_port_release
138 */
139 ref_dev:
140 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
141 atomic_long_inc(&se_cmd->se_dev->num_cmds);
142
143 if (se_cmd->data_direction == DMA_TO_DEVICE)
144 atomic_long_add(se_cmd->data_length,
145 &se_cmd->se_dev->write_bytes);
146 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
147 atomic_long_add(se_cmd->data_length,
148 &se_cmd->se_dev->read_bytes);
149
150 return ret;
151 }
152 EXPORT_SYMBOL(transport_lookup_cmd_lun);
153
154 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
155 {
156 struct se_dev_entry *deve;
157 struct se_lun *se_lun = NULL;
158 struct se_session *se_sess = se_cmd->se_sess;
159 struct se_node_acl *nacl = se_sess->se_node_acl;
160 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
161 unsigned long flags;
162
163 rcu_read_lock();
164 deve = target_nacl_find_deve(nacl, unpacked_lun);
165 if (deve) {
166 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
167 se_cmd->se_lun = rcu_dereference(deve->se_lun);
168 se_lun = rcu_dereference(deve->se_lun);
169 se_cmd->pr_res_key = deve->pr_res_key;
170 se_cmd->orig_fe_lun = unpacked_lun;
171 }
172 rcu_read_unlock();
173
174 if (!se_lun) {
175 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
176 " Access for 0x%08llx\n",
177 se_cmd->se_tfo->get_fabric_name(),
178 unpacked_lun);
179 return -ENODEV;
180 }
181 /*
182 * XXX: Add percpu se_lun->lun_ref reference count for TMR
183 */
184 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
185 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
186
187 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
188 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
189 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
190
191 return 0;
192 }
193 EXPORT_SYMBOL(transport_lookup_tmr_lun);
194
195 bool target_lun_is_rdonly(struct se_cmd *cmd)
196 {
197 struct se_session *se_sess = cmd->se_sess;
198 struct se_dev_entry *deve;
199 bool ret;
200
201 rcu_read_lock();
202 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
203 ret = deve && deve->lun_access_ro;
204 rcu_read_unlock();
205
206 return ret;
207 }
208 EXPORT_SYMBOL(target_lun_is_rdonly);
209
210 /*
211 * This function is called from core_scsi3_emulate_pro_register_and_move()
212 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
213 * when a matching rtpi is found.
214 */
215 struct se_dev_entry *core_get_se_deve_from_rtpi(
216 struct se_node_acl *nacl,
217 u16 rtpi)
218 {
219 struct se_dev_entry *deve;
220 struct se_lun *lun;
221 struct se_portal_group *tpg = nacl->se_tpg;
222
223 rcu_read_lock();
224 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
225 lun = rcu_dereference(deve->se_lun);
226 if (!lun) {
227 pr_err("%s device entries device pointer is"
228 " NULL, but Initiator has access.\n",
229 tpg->se_tpg_tfo->get_fabric_name());
230 continue;
231 }
232 if (lun->lun_rtpi != rtpi)
233 continue;
234
235 kref_get(&deve->pr_kref);
236 rcu_read_unlock();
237
238 return deve;
239 }
240 rcu_read_unlock();
241
242 return NULL;
243 }
244
245 void core_free_device_list_for_node(
246 struct se_node_acl *nacl,
247 struct se_portal_group *tpg)
248 {
249 struct se_dev_entry *deve;
250
251 mutex_lock(&nacl->lun_entry_mutex);
252 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
253 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
254 lockdep_is_held(&nacl->lun_entry_mutex));
255 core_disable_device_list_for_node(lun, deve, nacl, tpg);
256 }
257 mutex_unlock(&nacl->lun_entry_mutex);
258 }
259
260 void core_update_device_list_access(
261 u64 mapped_lun,
262 bool lun_access_ro,
263 struct se_node_acl *nacl)
264 {
265 struct se_dev_entry *deve;
266
267 mutex_lock(&nacl->lun_entry_mutex);
268 deve = target_nacl_find_deve(nacl, mapped_lun);
269 if (deve)
270 deve->lun_access_ro = lun_access_ro;
271 mutex_unlock(&nacl->lun_entry_mutex);
272 }
273
274 /*
275 * Called with rcu_read_lock or nacl->device_list_lock held.
276 */
277 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
278 {
279 struct se_dev_entry *deve;
280
281 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
282 if (deve->mapped_lun == mapped_lun)
283 return deve;
284
285 return NULL;
286 }
287 EXPORT_SYMBOL(target_nacl_find_deve);
288
289 void target_pr_kref_release(struct kref *kref)
290 {
291 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
292 pr_kref);
293 complete(&deve->pr_comp);
294 }
295
296 static void
297 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
298 bool skip_new)
299 {
300 struct se_dev_entry *tmp;
301
302 rcu_read_lock();
303 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
304 if (skip_new && tmp == new)
305 continue;
306 core_scsi3_ua_allocate(tmp, 0x3F,
307 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
308 }
309 rcu_read_unlock();
310 }
311
312 int core_enable_device_list_for_node(
313 struct se_lun *lun,
314 struct se_lun_acl *lun_acl,
315 u64 mapped_lun,
316 bool lun_access_ro,
317 struct se_node_acl *nacl,
318 struct se_portal_group *tpg)
319 {
320 struct se_dev_entry *orig, *new;
321
322 new = kzalloc(sizeof(*new), GFP_KERNEL);
323 if (!new) {
324 pr_err("Unable to allocate se_dev_entry memory\n");
325 return -ENOMEM;
326 }
327
328 atomic_set(&new->ua_count, 0);
329 spin_lock_init(&new->ua_lock);
330 INIT_LIST_HEAD(&new->ua_list);
331 INIT_LIST_HEAD(&new->lun_link);
332
333 new->mapped_lun = mapped_lun;
334 kref_init(&new->pr_kref);
335 init_completion(&new->pr_comp);
336
337 new->lun_access_ro = lun_access_ro;
338 new->creation_time = get_jiffies_64();
339 new->attach_count++;
340
341 mutex_lock(&nacl->lun_entry_mutex);
342 orig = target_nacl_find_deve(nacl, mapped_lun);
343 if (orig && orig->se_lun) {
344 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
345 lockdep_is_held(&nacl->lun_entry_mutex));
346
347 if (orig_lun != lun) {
348 pr_err("Existing orig->se_lun doesn't match new lun"
349 " for dynamic -> explicit NodeACL conversion:"
350 " %s\n", nacl->initiatorname);
351 mutex_unlock(&nacl->lun_entry_mutex);
352 kfree(new);
353 return -EINVAL;
354 }
355 BUG_ON(orig->se_lun_acl != NULL);
356
357 rcu_assign_pointer(new->se_lun, lun);
358 rcu_assign_pointer(new->se_lun_acl, lun_acl);
359 hlist_del_rcu(&orig->link);
360 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
361 mutex_unlock(&nacl->lun_entry_mutex);
362
363 spin_lock(&lun->lun_deve_lock);
364 list_del(&orig->lun_link);
365 list_add_tail(&new->lun_link, &lun->lun_deve_list);
366 spin_unlock(&lun->lun_deve_lock);
367
368 kref_put(&orig->pr_kref, target_pr_kref_release);
369 wait_for_completion(&orig->pr_comp);
370
371 target_luns_data_has_changed(nacl, new, true);
372 kfree_rcu(orig, rcu_head);
373 return 0;
374 }
375
376 rcu_assign_pointer(new->se_lun, lun);
377 rcu_assign_pointer(new->se_lun_acl, lun_acl);
378 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
379 mutex_unlock(&nacl->lun_entry_mutex);
380
381 spin_lock(&lun->lun_deve_lock);
382 list_add_tail(&new->lun_link, &lun->lun_deve_list);
383 spin_unlock(&lun->lun_deve_lock);
384
385 target_luns_data_has_changed(nacl, new, true);
386 return 0;
387 }
388
389 /*
390 * Called with se_node_acl->lun_entry_mutex held.
391 */
392 void core_disable_device_list_for_node(
393 struct se_lun *lun,
394 struct se_dev_entry *orig,
395 struct se_node_acl *nacl,
396 struct se_portal_group *tpg)
397 {
398 /*
399 * rcu_dereference_raw protected by se_lun->lun_group symlink
400 * reference to se_device->dev_group.
401 */
402 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
403 /*
404 * If the MappedLUN entry is being disabled, the entry in
405 * lun->lun_deve_list must be removed now before clearing the
406 * struct se_dev_entry pointers below as logic in
407 * core_alua_do_transition_tg_pt() depends on these being present.
408 *
409 * deve->se_lun_acl will be NULL for demo-mode created LUNs
410 * that have not been explicitly converted to MappedLUNs ->
411 * struct se_lun_acl, but we remove deve->lun_link from
412 * lun->lun_deve_list. This also means that active UAs and
413 * NodeACL context specific PR metadata for demo-mode
414 * MappedLUN *deve will be released below..
415 */
416 spin_lock(&lun->lun_deve_lock);
417 list_del(&orig->lun_link);
418 spin_unlock(&lun->lun_deve_lock);
419 /*
420 * Disable struct se_dev_entry LUN ACL mapping
421 */
422 core_scsi3_ua_release_all(orig);
423
424 hlist_del_rcu(&orig->link);
425 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
426 orig->lun_access_ro = false;
427 orig->creation_time = 0;
428 orig->attach_count--;
429 /*
430 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
431 * or REGISTER_AND_MOVE PR operation to complete.
432 */
433 kref_put(&orig->pr_kref, target_pr_kref_release);
434 wait_for_completion(&orig->pr_comp);
435
436 rcu_assign_pointer(orig->se_lun, NULL);
437 rcu_assign_pointer(orig->se_lun_acl, NULL);
438
439 kfree_rcu(orig, rcu_head);
440
441 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
442 target_luns_data_has_changed(nacl, NULL, false);
443 }
444
445 /* core_clear_lun_from_tpg():
446 *
447 *
448 */
449 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
450 {
451 struct se_node_acl *nacl;
452 struct se_dev_entry *deve;
453
454 mutex_lock(&tpg->acl_node_mutex);
455 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
456
457 mutex_lock(&nacl->lun_entry_mutex);
458 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
459 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
460 lockdep_is_held(&nacl->lun_entry_mutex));
461
462 if (lun != tmp_lun)
463 continue;
464
465 core_disable_device_list_for_node(lun, deve, nacl, tpg);
466 }
467 mutex_unlock(&nacl->lun_entry_mutex);
468 }
469 mutex_unlock(&tpg->acl_node_mutex);
470 }
471
472 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
473 {
474 struct se_lun *tmp;
475
476 spin_lock(&dev->se_port_lock);
477 if (dev->export_count == 0x0000ffff) {
478 pr_warn("Reached dev->dev_port_count =="
479 " 0x0000ffff\n");
480 spin_unlock(&dev->se_port_lock);
481 return -ENOSPC;
482 }
483 again:
484 /*
485 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
486 * Here is the table from spc4r17 section 7.7.3.8.
487 *
488 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
489 *
490 * Code Description
491 * 0h Reserved
492 * 1h Relative port 1, historically known as port A
493 * 2h Relative port 2, historically known as port B
494 * 3h to FFFFh Relative port 3 through 65 535
495 */
496 lun->lun_rtpi = dev->dev_rpti_counter++;
497 if (!lun->lun_rtpi)
498 goto again;
499
500 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
501 /*
502 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
503 * for 16-bit wrap..
504 */
505 if (lun->lun_rtpi == tmp->lun_rtpi)
506 goto again;
507 }
508 spin_unlock(&dev->se_port_lock);
509
510 return 0;
511 }
512
513 static void se_release_vpd_for_dev(struct se_device *dev)
514 {
515 struct t10_vpd *vpd, *vpd_tmp;
516
517 spin_lock(&dev->t10_wwn.t10_vpd_lock);
518 list_for_each_entry_safe(vpd, vpd_tmp,
519 &dev->t10_wwn.t10_vpd_list, vpd_list) {
520 list_del(&vpd->vpd_list);
521 kfree(vpd);
522 }
523 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
524 }
525
526 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
527 {
528 u32 aligned_max_sectors;
529 u32 alignment;
530 /*
531 * Limit max_sectors to a PAGE_SIZE aligned value for modern
532 * transport_allocate_data_tasks() operation.
533 */
534 alignment = max(1ul, PAGE_SIZE / block_size);
535 aligned_max_sectors = rounddown(max_sectors, alignment);
536
537 if (max_sectors != aligned_max_sectors)
538 pr_info("Rounding down aligned max_sectors from %u to %u\n",
539 max_sectors, aligned_max_sectors);
540
541 return aligned_max_sectors;
542 }
543
544 int core_dev_add_lun(
545 struct se_portal_group *tpg,
546 struct se_device *dev,
547 struct se_lun *lun)
548 {
549 int rc;
550
551 rc = core_tpg_add_lun(tpg, lun, false, dev);
552 if (rc < 0)
553 return rc;
554
555 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
556 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
557 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
558 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
559 /*
560 * Update LUN maps for dynamically added initiators when
561 * generate_node_acl is enabled.
562 */
563 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
564 struct se_node_acl *acl;
565
566 mutex_lock(&tpg->acl_node_mutex);
567 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
568 if (acl->dynamic_node_acl &&
569 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
570 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
571 core_tpg_add_node_to_devs(acl, tpg, lun);
572 }
573 }
574 mutex_unlock(&tpg->acl_node_mutex);
575 }
576
577 return 0;
578 }
579
580 /* core_dev_del_lun():
581 *
582 *
583 */
584 void core_dev_del_lun(
585 struct se_portal_group *tpg,
586 struct se_lun *lun)
587 {
588 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
589 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
590 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
591 tpg->se_tpg_tfo->get_fabric_name());
592
593 core_tpg_remove_lun(tpg, lun);
594 }
595
596 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
597 struct se_portal_group *tpg,
598 struct se_node_acl *nacl,
599 u64 mapped_lun,
600 int *ret)
601 {
602 struct se_lun_acl *lacl;
603
604 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
605 pr_err("%s InitiatorName exceeds maximum size.\n",
606 tpg->se_tpg_tfo->get_fabric_name());
607 *ret = -EOVERFLOW;
608 return NULL;
609 }
610 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
611 if (!lacl) {
612 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
613 *ret = -ENOMEM;
614 return NULL;
615 }
616
617 lacl->mapped_lun = mapped_lun;
618 lacl->se_lun_nacl = nacl;
619
620 return lacl;
621 }
622
623 int core_dev_add_initiator_node_lun_acl(
624 struct se_portal_group *tpg,
625 struct se_lun_acl *lacl,
626 struct se_lun *lun,
627 bool lun_access_ro)
628 {
629 struct se_node_acl *nacl = lacl->se_lun_nacl;
630 /*
631 * rcu_dereference_raw protected by se_lun->lun_group symlink
632 * reference to se_device->dev_group.
633 */
634 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
635
636 if (!nacl)
637 return -EINVAL;
638
639 if (lun->lun_access_ro)
640 lun_access_ro = true;
641
642 lacl->se_lun = lun;
643
644 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
645 lun_access_ro, nacl, tpg) < 0)
646 return -EINVAL;
647
648 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
649 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
650 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
651 lun_access_ro ? "RO" : "RW",
652 nacl->initiatorname);
653 /*
654 * Check to see if there are any existing persistent reservation APTPL
655 * pre-registrations that need to be enabled for this LUN ACL..
656 */
657 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
658 lacl->mapped_lun);
659 return 0;
660 }
661
662 int core_dev_del_initiator_node_lun_acl(
663 struct se_lun *lun,
664 struct se_lun_acl *lacl)
665 {
666 struct se_portal_group *tpg = lun->lun_tpg;
667 struct se_node_acl *nacl;
668 struct se_dev_entry *deve;
669
670 nacl = lacl->se_lun_nacl;
671 if (!nacl)
672 return -EINVAL;
673
674 mutex_lock(&nacl->lun_entry_mutex);
675 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
676 if (deve)
677 core_disable_device_list_for_node(lun, deve, nacl, tpg);
678 mutex_unlock(&nacl->lun_entry_mutex);
679
680 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
681 " InitiatorNode: %s Mapped LUN: %llu\n",
682 tpg->se_tpg_tfo->get_fabric_name(),
683 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
684 nacl->initiatorname, lacl->mapped_lun);
685
686 return 0;
687 }
688
689 void core_dev_free_initiator_node_lun_acl(
690 struct se_portal_group *tpg,
691 struct se_lun_acl *lacl)
692 {
693 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
694 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
695 tpg->se_tpg_tfo->tpg_get_tag(tpg),
696 tpg->se_tpg_tfo->get_fabric_name(),
697 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
698
699 kfree(lacl);
700 }
701
702 static void scsi_dump_inquiry(struct se_device *dev)
703 {
704 struct t10_wwn *wwn = &dev->t10_wwn;
705 char buf[17];
706 int i, device_type;
707 /*
708 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
709 */
710 for (i = 0; i < 8; i++)
711 if (wwn->vendor[i] >= 0x20)
712 buf[i] = wwn->vendor[i];
713 else
714 buf[i] = ' ';
715 buf[i] = '\0';
716 pr_debug(" Vendor: %s\n", buf);
717
718 for (i = 0; i < 16; i++)
719 if (wwn->model[i] >= 0x20)
720 buf[i] = wwn->model[i];
721 else
722 buf[i] = ' ';
723 buf[i] = '\0';
724 pr_debug(" Model: %s\n", buf);
725
726 for (i = 0; i < 4; i++)
727 if (wwn->revision[i] >= 0x20)
728 buf[i] = wwn->revision[i];
729 else
730 buf[i] = ' ';
731 buf[i] = '\0';
732 pr_debug(" Revision: %s\n", buf);
733
734 device_type = dev->transport->get_device_type(dev);
735 pr_debug(" Type: %s ", scsi_device_type(device_type));
736 }
737
738 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
739 {
740 struct se_device *dev;
741 struct se_lun *xcopy_lun;
742
743 dev = hba->backend->ops->alloc_device(hba, name);
744 if (!dev)
745 return NULL;
746
747 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
748 dev->se_hba = hba;
749 dev->transport = hba->backend->ops;
750 dev->prot_length = sizeof(struct t10_pi_tuple);
751 dev->hba_index = hba->hba_index;
752
753 INIT_LIST_HEAD(&dev->dev_list);
754 INIT_LIST_HEAD(&dev->dev_sep_list);
755 INIT_LIST_HEAD(&dev->dev_tmr_list);
756 INIT_LIST_HEAD(&dev->delayed_cmd_list);
757 INIT_LIST_HEAD(&dev->state_list);
758 INIT_LIST_HEAD(&dev->qf_cmd_list);
759 INIT_LIST_HEAD(&dev->g_dev_node);
760 spin_lock_init(&dev->execute_task_lock);
761 spin_lock_init(&dev->delayed_cmd_lock);
762 spin_lock_init(&dev->dev_reservation_lock);
763 spin_lock_init(&dev->se_port_lock);
764 spin_lock_init(&dev->se_tmr_lock);
765 spin_lock_init(&dev->qf_cmd_lock);
766 sema_init(&dev->caw_sem, 1);
767 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
768 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
769 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
770 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
771 spin_lock_init(&dev->t10_pr.registration_lock);
772 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
773 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
774 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
775 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
776 spin_lock_init(&dev->t10_alua.lba_map_lock);
777
778 dev->t10_wwn.t10_dev = dev;
779 dev->t10_alua.t10_dev = dev;
780
781 dev->dev_attrib.da_dev = dev;
782 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
783 dev->dev_attrib.emulate_dpo = 1;
784 dev->dev_attrib.emulate_fua_write = 1;
785 dev->dev_attrib.emulate_fua_read = 1;
786 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
787 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
788 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
789 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
790 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
791 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
792 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
793 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
794 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
795 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
796 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
797 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
798 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
799 dev->dev_attrib.max_unmap_block_desc_count =
800 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
801 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
802 dev->dev_attrib.unmap_granularity_alignment =
803 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
804 dev->dev_attrib.unmap_zeroes_data =
805 DA_UNMAP_ZEROES_DATA_DEFAULT;
806 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
807
808 xcopy_lun = &dev->xcopy_lun;
809 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
810 init_completion(&xcopy_lun->lun_ref_comp);
811 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
812 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
813 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
814 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
815
816 return dev;
817 }
818
819 /*
820 * Check if the underlying struct block_device request_queue supports
821 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
822 * in ATA and we need to set TPE=1
823 */
824 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
825 struct request_queue *q)
826 {
827 int block_size = queue_logical_block_size(q);
828
829 if (!blk_queue_discard(q))
830 return false;
831
832 attrib->max_unmap_lba_count =
833 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
834 /*
835 * Currently hardcoded to 1 in Linux/SCSI code..
836 */
837 attrib->max_unmap_block_desc_count = 1;
838 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
839 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
840 block_size;
841 attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
842 return true;
843 }
844 EXPORT_SYMBOL(target_configure_unmap_from_queue);
845
846 /*
847 * Convert from blocksize advertised to the initiator to the 512 byte
848 * units unconditionally used by the Linux block layer.
849 */
850 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
851 {
852 switch (dev->dev_attrib.block_size) {
853 case 4096:
854 return lb << 3;
855 case 2048:
856 return lb << 2;
857 case 1024:
858 return lb << 1;
859 default:
860 return lb;
861 }
862 }
863 EXPORT_SYMBOL(target_to_linux_sector);
864
865 int target_configure_device(struct se_device *dev)
866 {
867 struct se_hba *hba = dev->se_hba;
868 int ret;
869
870 if (dev->dev_flags & DF_CONFIGURED) {
871 pr_err("se_dev->se_dev_ptr already set for storage"
872 " object\n");
873 return -EEXIST;
874 }
875
876 ret = dev->transport->configure_device(dev);
877 if (ret)
878 goto out;
879 /*
880 * XXX: there is not much point to have two different values here..
881 */
882 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
883 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
884
885 /*
886 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
887 */
888 dev->dev_attrib.hw_max_sectors =
889 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
890 dev->dev_attrib.hw_block_size);
891 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
892
893 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
894 dev->creation_time = get_jiffies_64();
895
896 ret = core_setup_alua(dev);
897 if (ret)
898 goto out;
899
900 /*
901 * Startup the struct se_device processing thread
902 */
903 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
904 dev->transport->name);
905 if (!dev->tmr_wq) {
906 pr_err("Unable to create tmr workqueue for %s\n",
907 dev->transport->name);
908 ret = -ENOMEM;
909 goto out_free_alua;
910 }
911
912 /*
913 * Setup work_queue for QUEUE_FULL
914 */
915 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
916
917 /*
918 * Preload the initial INQUIRY const values if we are doing
919 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
920 * passthrough because this is being provided by the backend LLD.
921 */
922 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
923 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
924 strncpy(&dev->t10_wwn.model[0],
925 dev->transport->inquiry_prod, 16);
926 strncpy(&dev->t10_wwn.revision[0],
927 dev->transport->inquiry_rev, 4);
928 }
929
930 scsi_dump_inquiry(dev);
931
932 spin_lock(&hba->device_lock);
933 hba->dev_count++;
934 spin_unlock(&hba->device_lock);
935
936 mutex_lock(&g_device_mutex);
937 list_add_tail(&dev->g_dev_node, &g_device_list);
938 mutex_unlock(&g_device_mutex);
939
940 dev->dev_flags |= DF_CONFIGURED;
941
942 return 0;
943
944 out_free_alua:
945 core_alua_free_lu_gp_mem(dev);
946 out:
947 se_release_vpd_for_dev(dev);
948 return ret;
949 }
950
951 void target_free_device(struct se_device *dev)
952 {
953 struct se_hba *hba = dev->se_hba;
954
955 WARN_ON(!list_empty(&dev->dev_sep_list));
956
957 if (dev->dev_flags & DF_CONFIGURED) {
958 destroy_workqueue(dev->tmr_wq);
959
960 mutex_lock(&g_device_mutex);
961 list_del(&dev->g_dev_node);
962 mutex_unlock(&g_device_mutex);
963
964 spin_lock(&hba->device_lock);
965 hba->dev_count--;
966 spin_unlock(&hba->device_lock);
967 }
968
969 core_alua_free_lu_gp_mem(dev);
970 core_alua_set_lba_map(dev, NULL, 0, 0);
971 core_scsi3_free_all_registrations(dev);
972 se_release_vpd_for_dev(dev);
973
974 if (dev->transport->free_prot)
975 dev->transport->free_prot(dev);
976
977 dev->transport->free_device(dev);
978 }
979
980 int core_dev_setup_virtual_lun0(void)
981 {
982 struct se_hba *hba;
983 struct se_device *dev;
984 char buf[] = "rd_pages=8,rd_nullio=1";
985 int ret;
986
987 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
988 if (IS_ERR(hba))
989 return PTR_ERR(hba);
990
991 dev = target_alloc_device(hba, "virt_lun0");
992 if (!dev) {
993 ret = -ENOMEM;
994 goto out_free_hba;
995 }
996
997 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
998
999 ret = target_configure_device(dev);
1000 if (ret)
1001 goto out_free_se_dev;
1002
1003 lun0_hba = hba;
1004 g_lun0_dev = dev;
1005 return 0;
1006
1007 out_free_se_dev:
1008 target_free_device(dev);
1009 out_free_hba:
1010 core_delete_hba(hba);
1011 return ret;
1012 }
1013
1014
1015 void core_dev_release_virtual_lun0(void)
1016 {
1017 struct se_hba *hba = lun0_hba;
1018
1019 if (!hba)
1020 return;
1021
1022 if (g_lun0_dev)
1023 target_free_device(g_lun0_dev);
1024 core_delete_hba(hba);
1025 }
1026
1027 /*
1028 * Common CDB parsing for kernel and user passthrough.
1029 */
1030 sense_reason_t
1031 passthrough_parse_cdb(struct se_cmd *cmd,
1032 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1033 {
1034 unsigned char *cdb = cmd->t_task_cdb;
1035
1036 /*
1037 * Clear a lun set in the cdb if the initiator talking to use spoke
1038 * and old standards version, as we can't assume the underlying device
1039 * won't choke up on it.
1040 */
1041 switch (cdb[0]) {
1042 case READ_10: /* SBC - RDProtect */
1043 case READ_12: /* SBC - RDProtect */
1044 case READ_16: /* SBC - RDProtect */
1045 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046 case VERIFY: /* SBC - VRProtect */
1047 case VERIFY_16: /* SBC - VRProtect */
1048 case WRITE_VERIFY: /* SBC - VRProtect */
1049 case WRITE_VERIFY_12: /* SBC - VRProtect */
1050 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051 break;
1052 default:
1053 cdb[1] &= 0x1f; /* clear logical unit number */
1054 break;
1055 }
1056
1057 /*
1058 * For REPORT LUNS we always need to emulate the response, for everything
1059 * else, pass it up.
1060 */
1061 if (cdb[0] == REPORT_LUNS) {
1062 cmd->execute_cmd = spc_emulate_report_luns;
1063 return TCM_NO_SENSE;
1064 }
1065
1066 /* Set DATA_CDB flag for ops that should have it */
1067 switch (cdb[0]) {
1068 case READ_6:
1069 case READ_10:
1070 case READ_12:
1071 case READ_16:
1072 case WRITE_6:
1073 case WRITE_10:
1074 case WRITE_12:
1075 case WRITE_16:
1076 case WRITE_VERIFY:
1077 case WRITE_VERIFY_12:
1078 case 0x8e: /* WRITE_VERIFY_16 */
1079 case COMPARE_AND_WRITE:
1080 case XDWRITEREAD_10:
1081 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1082 break;
1083 case VARIABLE_LENGTH_CMD:
1084 switch (get_unaligned_be16(&cdb[8])) {
1085 case READ_32:
1086 case WRITE_32:
1087 case 0x0c: /* WRITE_VERIFY_32 */
1088 case XDWRITEREAD_32:
1089 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1090 break;
1091 }
1092 }
1093
1094 cmd->execute_cmd = exec_cmd;
1095
1096 return TCM_NO_SENSE;
1097 }
1098 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support