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mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blobcc38a3509f78ca26f966b521c7207e9d45a9c869
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
81 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
82 se_lun = NULL;
83 goto out_unlock;
84 }
85
86 se_cmd->se_lun = rcu_dereference(deve->se_lun);
87 se_cmd->pr_res_key = deve->pr_res_key;
88 se_cmd->orig_fe_lun = unpacked_lun;
89 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
90 se_cmd->lun_ref_active = true;
91
92 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
93 deve->lun_access_ro) {
94 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
95 " Access for 0x%08llx\n",
96 se_cmd->se_tfo->get_fabric_name(),
97 unpacked_lun);
98 rcu_read_unlock();
99 ret = TCM_WRITE_PROTECTED;
100 goto ref_dev;
101 }
102 }
103 out_unlock:
104 rcu_read_unlock();
105
106 if (!se_lun) {
107 /*
108 * Use the se_portal_group->tpg_virt_lun0 to allow for
109 * REPORT_LUNS, et al to be returned when no active
110 * MappedLUN=0 exists for this Initiator Port.
111 */
112 if (unpacked_lun != 0) {
113 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
114 " Access for 0x%08llx\n",
115 se_cmd->se_tfo->get_fabric_name(),
116 unpacked_lun);
117 return TCM_NON_EXISTENT_LUN;
118 }
119
120 se_lun = se_sess->se_tpg->tpg_virt_lun0;
121 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
122 se_cmd->orig_fe_lun = 0;
123 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
124
125 percpu_ref_get(&se_lun->lun_ref);
126 se_cmd->lun_ref_active = true;
127
128 /*
129 * Force WRITE PROTECT for virtual LUN 0
130 */
131 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
132 (se_cmd->data_direction != DMA_NONE)) {
133 ret = TCM_WRITE_PROTECTED;
134 goto ref_dev;
135 }
136 }
137 /*
138 * RCU reference protected by percpu se_lun->lun_ref taken above that
139 * must drop to zero (including initial reference) before this se_lun
140 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
141 * target_core_fabric_configfs.c:target_fabric_port_release
142 */
143 ref_dev:
144 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
145 atomic_long_inc(&se_cmd->se_dev->num_cmds);
146
147 if (se_cmd->data_direction == DMA_TO_DEVICE)
148 atomic_long_add(se_cmd->data_length,
149 &se_cmd->se_dev->write_bytes);
150 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
151 atomic_long_add(se_cmd->data_length,
152 &se_cmd->se_dev->read_bytes);
153
154 return ret;
155 }
156 EXPORT_SYMBOL(transport_lookup_cmd_lun);
157
158 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
159 {
160 struct se_dev_entry *deve;
161 struct se_lun *se_lun = NULL;
162 struct se_session *se_sess = se_cmd->se_sess;
163 struct se_node_acl *nacl = se_sess->se_node_acl;
164 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
165 unsigned long flags;
166
167 rcu_read_lock();
168 deve = target_nacl_find_deve(nacl, unpacked_lun);
169 if (deve) {
170 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
171 se_cmd->se_lun = rcu_dereference(deve->se_lun);
172 se_lun = rcu_dereference(deve->se_lun);
173 se_cmd->pr_res_key = deve->pr_res_key;
174 se_cmd->orig_fe_lun = unpacked_lun;
175 }
176 rcu_read_unlock();
177
178 if (!se_lun) {
179 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
180 " Access for 0x%08llx\n",
181 se_cmd->se_tfo->get_fabric_name(),
182 unpacked_lun);
183 return -ENODEV;
184 }
185 /*
186 * XXX: Add percpu se_lun->lun_ref reference count for TMR
187 */
188 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
189 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
190
191 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
192 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
193 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
194
195 return 0;
196 }
197 EXPORT_SYMBOL(transport_lookup_tmr_lun);
198
199 bool target_lun_is_rdonly(struct se_cmd *cmd)
200 {
201 struct se_session *se_sess = cmd->se_sess;
202 struct se_dev_entry *deve;
203 bool ret;
204
205 rcu_read_lock();
206 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
207 ret = deve && deve->lun_access_ro;
208 rcu_read_unlock();
209
210 return ret;
211 }
212 EXPORT_SYMBOL(target_lun_is_rdonly);
213
214 /*
215 * This function is called from core_scsi3_emulate_pro_register_and_move()
216 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
217 * when a matching rtpi is found.
218 */
219 struct se_dev_entry *core_get_se_deve_from_rtpi(
220 struct se_node_acl *nacl,
221 u16 rtpi)
222 {
223 struct se_dev_entry *deve;
224 struct se_lun *lun;
225 struct se_portal_group *tpg = nacl->se_tpg;
226
227 rcu_read_lock();
228 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
229 lun = rcu_dereference(deve->se_lun);
230 if (!lun) {
231 pr_err("%s device entries device pointer is"
232 " NULL, but Initiator has access.\n",
233 tpg->se_tpg_tfo->get_fabric_name());
234 continue;
235 }
236 if (lun->lun_rtpi != rtpi)
237 continue;
238
239 kref_get(&deve->pr_kref);
240 rcu_read_unlock();
241
242 return deve;
243 }
244 rcu_read_unlock();
245
246 return NULL;
247 }
248
249 void core_free_device_list_for_node(
250 struct se_node_acl *nacl,
251 struct se_portal_group *tpg)
252 {
253 struct se_dev_entry *deve;
254
255 mutex_lock(&nacl->lun_entry_mutex);
256 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
257 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
258 lockdep_is_held(&nacl->lun_entry_mutex));
259 core_disable_device_list_for_node(lun, deve, nacl, tpg);
260 }
261 mutex_unlock(&nacl->lun_entry_mutex);
262 }
263
264 void core_update_device_list_access(
265 u64 mapped_lun,
266 bool lun_access_ro,
267 struct se_node_acl *nacl)
268 {
269 struct se_dev_entry *deve;
270
271 mutex_lock(&nacl->lun_entry_mutex);
272 deve = target_nacl_find_deve(nacl, mapped_lun);
273 if (deve)
274 deve->lun_access_ro = lun_access_ro;
275 mutex_unlock(&nacl->lun_entry_mutex);
276 }
277
278 /*
279 * Called with rcu_read_lock or nacl->device_list_lock held.
280 */
281 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
282 {
283 struct se_dev_entry *deve;
284
285 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
286 if (deve->mapped_lun == mapped_lun)
287 return deve;
288
289 return NULL;
290 }
291 EXPORT_SYMBOL(target_nacl_find_deve);
292
293 void target_pr_kref_release(struct kref *kref)
294 {
295 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
296 pr_kref);
297 complete(&deve->pr_comp);
298 }
299
300 static void
301 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
302 bool skip_new)
303 {
304 struct se_dev_entry *tmp;
305
306 rcu_read_lock();
307 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
308 if (skip_new && tmp == new)
309 continue;
310 core_scsi3_ua_allocate(tmp, 0x3F,
311 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
312 }
313 rcu_read_unlock();
314 }
315
316 int core_enable_device_list_for_node(
317 struct se_lun *lun,
318 struct se_lun_acl *lun_acl,
319 u64 mapped_lun,
320 bool lun_access_ro,
321 struct se_node_acl *nacl,
322 struct se_portal_group *tpg)
323 {
324 struct se_dev_entry *orig, *new;
325
326 new = kzalloc(sizeof(*new), GFP_KERNEL);
327 if (!new) {
328 pr_err("Unable to allocate se_dev_entry memory\n");
329 return -ENOMEM;
330 }
331
332 atomic_set(&new->ua_count, 0);
333 spin_lock_init(&new->ua_lock);
334 INIT_LIST_HEAD(&new->ua_list);
335 INIT_LIST_HEAD(&new->lun_link);
336
337 new->mapped_lun = mapped_lun;
338 kref_init(&new->pr_kref);
339 init_completion(&new->pr_comp);
340
341 new->lun_access_ro = lun_access_ro;
342 new->creation_time = get_jiffies_64();
343 new->attach_count++;
344
345 mutex_lock(&nacl->lun_entry_mutex);
346 orig = target_nacl_find_deve(nacl, mapped_lun);
347 if (orig && orig->se_lun) {
348 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
349 lockdep_is_held(&nacl->lun_entry_mutex));
350
351 if (orig_lun != lun) {
352 pr_err("Existing orig->se_lun doesn't match new lun"
353 " for dynamic -> explicit NodeACL conversion:"
354 " %s\n", nacl->initiatorname);
355 mutex_unlock(&nacl->lun_entry_mutex);
356 kfree(new);
357 return -EINVAL;
358 }
359 if (orig->se_lun_acl != NULL) {
360 pr_warn_ratelimited("Detected existing explicit"
361 " se_lun_acl->se_lun_group reference for %s"
362 " mapped_lun: %llu, failing\n",
363 nacl->initiatorname, mapped_lun);
364 mutex_unlock(&nacl->lun_entry_mutex);
365 kfree(new);
366 return -EINVAL;
367 }
368
369 rcu_assign_pointer(new->se_lun, lun);
370 rcu_assign_pointer(new->se_lun_acl, lun_acl);
371 hlist_del_rcu(&orig->link);
372 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
373 mutex_unlock(&nacl->lun_entry_mutex);
374
375 spin_lock(&lun->lun_deve_lock);
376 list_del(&orig->lun_link);
377 list_add_tail(&new->lun_link, &lun->lun_deve_list);
378 spin_unlock(&lun->lun_deve_lock);
379
380 kref_put(&orig->pr_kref, target_pr_kref_release);
381 wait_for_completion(&orig->pr_comp);
382
383 target_luns_data_has_changed(nacl, new, true);
384 kfree_rcu(orig, rcu_head);
385 return 0;
386 }
387
388 rcu_assign_pointer(new->se_lun, lun);
389 rcu_assign_pointer(new->se_lun_acl, lun_acl);
390 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
391 mutex_unlock(&nacl->lun_entry_mutex);
392
393 spin_lock(&lun->lun_deve_lock);
394 list_add_tail(&new->lun_link, &lun->lun_deve_list);
395 spin_unlock(&lun->lun_deve_lock);
396
397 target_luns_data_has_changed(nacl, new, true);
398 return 0;
399 }
400
401 /*
402 * Called with se_node_acl->lun_entry_mutex held.
403 */
404 void core_disable_device_list_for_node(
405 struct se_lun *lun,
406 struct se_dev_entry *orig,
407 struct se_node_acl *nacl,
408 struct se_portal_group *tpg)
409 {
410 /*
411 * rcu_dereference_raw protected by se_lun->lun_group symlink
412 * reference to se_device->dev_group.
413 */
414 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
415 /*
416 * If the MappedLUN entry is being disabled, the entry in
417 * lun->lun_deve_list must be removed now before clearing the
418 * struct se_dev_entry pointers below as logic in
419 * core_alua_do_transition_tg_pt() depends on these being present.
420 *
421 * deve->se_lun_acl will be NULL for demo-mode created LUNs
422 * that have not been explicitly converted to MappedLUNs ->
423 * struct se_lun_acl, but we remove deve->lun_link from
424 * lun->lun_deve_list. This also means that active UAs and
425 * NodeACL context specific PR metadata for demo-mode
426 * MappedLUN *deve will be released below..
427 */
428 spin_lock(&lun->lun_deve_lock);
429 list_del(&orig->lun_link);
430 spin_unlock(&lun->lun_deve_lock);
431 /*
432 * Disable struct se_dev_entry LUN ACL mapping
433 */
434 core_scsi3_ua_release_all(orig);
435
436 hlist_del_rcu(&orig->link);
437 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
438 orig->lun_access_ro = false;
439 orig->creation_time = 0;
440 orig->attach_count--;
441 /*
442 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
443 * or REGISTER_AND_MOVE PR operation to complete.
444 */
445 kref_put(&orig->pr_kref, target_pr_kref_release);
446 wait_for_completion(&orig->pr_comp);
447
448 rcu_assign_pointer(orig->se_lun, NULL);
449 rcu_assign_pointer(orig->se_lun_acl, NULL);
450
451 kfree_rcu(orig, rcu_head);
452
453 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
454 target_luns_data_has_changed(nacl, NULL, false);
455 }
456
457 /* core_clear_lun_from_tpg():
458 *
459 *
460 */
461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462 {
463 struct se_node_acl *nacl;
464 struct se_dev_entry *deve;
465
466 mutex_lock(&tpg->acl_node_mutex);
467 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
468
469 mutex_lock(&nacl->lun_entry_mutex);
470 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
471 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
472 lockdep_is_held(&nacl->lun_entry_mutex));
473
474 if (lun != tmp_lun)
475 continue;
476
477 core_disable_device_list_for_node(lun, deve, nacl, tpg);
478 }
479 mutex_unlock(&nacl->lun_entry_mutex);
480 }
481 mutex_unlock(&tpg->acl_node_mutex);
482 }
483
484 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
485 {
486 struct se_lun *tmp;
487
488 spin_lock(&dev->se_port_lock);
489 if (dev->export_count == 0x0000ffff) {
490 pr_warn("Reached dev->dev_port_count =="
491 " 0x0000ffff\n");
492 spin_unlock(&dev->se_port_lock);
493 return -ENOSPC;
494 }
495 again:
496 /*
497 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
498 * Here is the table from spc4r17 section 7.7.3.8.
499 *
500 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
501 *
502 * Code Description
503 * 0h Reserved
504 * 1h Relative port 1, historically known as port A
505 * 2h Relative port 2, historically known as port B
506 * 3h to FFFFh Relative port 3 through 65 535
507 */
508 lun->lun_rtpi = dev->dev_rpti_counter++;
509 if (!lun->lun_rtpi)
510 goto again;
511
512 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
513 /*
514 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
515 * for 16-bit wrap..
516 */
517 if (lun->lun_rtpi == tmp->lun_rtpi)
518 goto again;
519 }
520 spin_unlock(&dev->se_port_lock);
521
522 return 0;
523 }
524
525 static void se_release_vpd_for_dev(struct se_device *dev)
526 {
527 struct t10_vpd *vpd, *vpd_tmp;
528
529 spin_lock(&dev->t10_wwn.t10_vpd_lock);
530 list_for_each_entry_safe(vpd, vpd_tmp,
531 &dev->t10_wwn.t10_vpd_list, vpd_list) {
532 list_del(&vpd->vpd_list);
533 kfree(vpd);
534 }
535 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
536 }
537
538 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
539 {
540 u32 aligned_max_sectors;
541 u32 alignment;
542 /*
543 * Limit max_sectors to a PAGE_SIZE aligned value for modern
544 * transport_allocate_data_tasks() operation.
545 */
546 alignment = max(1ul, PAGE_SIZE / block_size);
547 aligned_max_sectors = rounddown(max_sectors, alignment);
548
549 if (max_sectors != aligned_max_sectors)
550 pr_info("Rounding down aligned max_sectors from %u to %u\n",
551 max_sectors, aligned_max_sectors);
552
553 return aligned_max_sectors;
554 }
555
556 int core_dev_add_lun(
557 struct se_portal_group *tpg,
558 struct se_device *dev,
559 struct se_lun *lun)
560 {
561 int rc;
562
563 rc = core_tpg_add_lun(tpg, lun, false, dev);
564 if (rc < 0)
565 return rc;
566
567 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
568 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
569 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
570 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
571 /*
572 * Update LUN maps for dynamically added initiators when
573 * generate_node_acl is enabled.
574 */
575 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
576 struct se_node_acl *acl;
577
578 mutex_lock(&tpg->acl_node_mutex);
579 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
580 if (acl->dynamic_node_acl &&
581 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
582 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
583 core_tpg_add_node_to_devs(acl, tpg, lun);
584 }
585 }
586 mutex_unlock(&tpg->acl_node_mutex);
587 }
588
589 return 0;
590 }
591
592 /* core_dev_del_lun():
593 *
594 *
595 */
596 void core_dev_del_lun(
597 struct se_portal_group *tpg,
598 struct se_lun *lun)
599 {
600 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
601 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
602 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
603 tpg->se_tpg_tfo->get_fabric_name());
604
605 core_tpg_remove_lun(tpg, lun);
606 }
607
608 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
609 struct se_portal_group *tpg,
610 struct se_node_acl *nacl,
611 u64 mapped_lun,
612 int *ret)
613 {
614 struct se_lun_acl *lacl;
615
616 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
617 pr_err("%s InitiatorName exceeds maximum size.\n",
618 tpg->se_tpg_tfo->get_fabric_name());
619 *ret = -EOVERFLOW;
620 return NULL;
621 }
622 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
623 if (!lacl) {
624 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
625 *ret = -ENOMEM;
626 return NULL;
627 }
628
629 lacl->mapped_lun = mapped_lun;
630 lacl->se_lun_nacl = nacl;
631
632 return lacl;
633 }
634
635 int core_dev_add_initiator_node_lun_acl(
636 struct se_portal_group *tpg,
637 struct se_lun_acl *lacl,
638 struct se_lun *lun,
639 bool lun_access_ro)
640 {
641 struct se_node_acl *nacl = lacl->se_lun_nacl;
642 /*
643 * rcu_dereference_raw protected by se_lun->lun_group symlink
644 * reference to se_device->dev_group.
645 */
646 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
647
648 if (!nacl)
649 return -EINVAL;
650
651 if (lun->lun_access_ro)
652 lun_access_ro = true;
653
654 lacl->se_lun = lun;
655
656 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
657 lun_access_ro, nacl, tpg) < 0)
658 return -EINVAL;
659
660 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
661 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
662 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
663 lun_access_ro ? "RO" : "RW",
664 nacl->initiatorname);
665 /*
666 * Check to see if there are any existing persistent reservation APTPL
667 * pre-registrations that need to be enabled for this LUN ACL..
668 */
669 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
670 lacl->mapped_lun);
671 return 0;
672 }
673
674 int core_dev_del_initiator_node_lun_acl(
675 struct se_lun *lun,
676 struct se_lun_acl *lacl)
677 {
678 struct se_portal_group *tpg = lun->lun_tpg;
679 struct se_node_acl *nacl;
680 struct se_dev_entry *deve;
681
682 nacl = lacl->se_lun_nacl;
683 if (!nacl)
684 return -EINVAL;
685
686 mutex_lock(&nacl->lun_entry_mutex);
687 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
688 if (deve)
689 core_disable_device_list_for_node(lun, deve, nacl, tpg);
690 mutex_unlock(&nacl->lun_entry_mutex);
691
692 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
693 " InitiatorNode: %s Mapped LUN: %llu\n",
694 tpg->se_tpg_tfo->get_fabric_name(),
695 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
696 nacl->initiatorname, lacl->mapped_lun);
697
698 return 0;
699 }
700
701 void core_dev_free_initiator_node_lun_acl(
702 struct se_portal_group *tpg,
703 struct se_lun_acl *lacl)
704 {
705 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
706 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
707 tpg->se_tpg_tfo->tpg_get_tag(tpg),
708 tpg->se_tpg_tfo->get_fabric_name(),
709 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
710
711 kfree(lacl);
712 }
713
714 static void scsi_dump_inquiry(struct se_device *dev)
715 {
716 struct t10_wwn *wwn = &dev->t10_wwn;
717 char buf[17];
718 int i, device_type;
719 /*
720 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
721 */
722 for (i = 0; i < 8; i++)
723 if (wwn->vendor[i] >= 0x20)
724 buf[i] = wwn->vendor[i];
725 else
726 buf[i] = ' ';
727 buf[i] = '\0';
728 pr_debug(" Vendor: %s\n", buf);
729
730 for (i = 0; i < 16; i++)
731 if (wwn->model[i] >= 0x20)
732 buf[i] = wwn->model[i];
733 else
734 buf[i] = ' ';
735 buf[i] = '\0';
736 pr_debug(" Model: %s\n", buf);
737
738 for (i = 0; i < 4; i++)
739 if (wwn->revision[i] >= 0x20)
740 buf[i] = wwn->revision[i];
741 else
742 buf[i] = ' ';
743 buf[i] = '\0';
744 pr_debug(" Revision: %s\n", buf);
745
746 device_type = dev->transport->get_device_type(dev);
747 pr_debug(" Type: %s ", scsi_device_type(device_type));
748 }
749
750 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
751 {
752 struct se_device *dev;
753 struct se_lun *xcopy_lun;
754
755 dev = hba->backend->ops->alloc_device(hba, name);
756 if (!dev)
757 return NULL;
758
759 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
760 dev->se_hba = hba;
761 dev->transport = hba->backend->ops;
762 dev->prot_length = sizeof(struct t10_pi_tuple);
763 dev->hba_index = hba->hba_index;
764
765 INIT_LIST_HEAD(&dev->dev_list);
766 INIT_LIST_HEAD(&dev->dev_sep_list);
767 INIT_LIST_HEAD(&dev->dev_tmr_list);
768 INIT_LIST_HEAD(&dev->delayed_cmd_list);
769 INIT_LIST_HEAD(&dev->state_list);
770 INIT_LIST_HEAD(&dev->qf_cmd_list);
771 INIT_LIST_HEAD(&dev->g_dev_node);
772 spin_lock_init(&dev->execute_task_lock);
773 spin_lock_init(&dev->delayed_cmd_lock);
774 spin_lock_init(&dev->dev_reservation_lock);
775 spin_lock_init(&dev->se_port_lock);
776 spin_lock_init(&dev->se_tmr_lock);
777 spin_lock_init(&dev->qf_cmd_lock);
778 sema_init(&dev->caw_sem, 1);
779 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
780 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
781 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
782 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
783 spin_lock_init(&dev->t10_pr.registration_lock);
784 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
785 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
786 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
787 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
788 spin_lock_init(&dev->t10_alua.lba_map_lock);
789
790 dev->t10_wwn.t10_dev = dev;
791 dev->t10_alua.t10_dev = dev;
792
793 dev->dev_attrib.da_dev = dev;
794 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
795 dev->dev_attrib.emulate_dpo = 1;
796 dev->dev_attrib.emulate_fua_write = 1;
797 dev->dev_attrib.emulate_fua_read = 1;
798 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
799 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
800 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
801 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
802 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
803 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
804 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
805 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
806 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
807 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
808 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
809 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
810 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
811 dev->dev_attrib.max_unmap_block_desc_count =
812 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
813 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
814 dev->dev_attrib.unmap_granularity_alignment =
815 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
816 dev->dev_attrib.unmap_zeroes_data =
817 DA_UNMAP_ZEROES_DATA_DEFAULT;
818 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
819
820 xcopy_lun = &dev->xcopy_lun;
821 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
822 init_completion(&xcopy_lun->lun_ref_comp);
823 init_completion(&xcopy_lun->lun_shutdown_comp);
824 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
825 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
826 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
827 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
828
829 return dev;
830 }
831
832 /*
833 * Check if the underlying struct block_device request_queue supports
834 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
835 * in ATA and we need to set TPE=1
836 */
837 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
838 struct request_queue *q)
839 {
840 int block_size = queue_logical_block_size(q);
841
842 if (!blk_queue_discard(q))
843 return false;
844
845 attrib->max_unmap_lba_count =
846 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
847 /*
848 * Currently hardcoded to 1 in Linux/SCSI code..
849 */
850 attrib->max_unmap_block_desc_count = 1;
851 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
852 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
853 block_size;
854 attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
855 return true;
856 }
857 EXPORT_SYMBOL(target_configure_unmap_from_queue);
858
859 /*
860 * Convert from blocksize advertised to the initiator to the 512 byte
861 * units unconditionally used by the Linux block layer.
862 */
863 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
864 {
865 switch (dev->dev_attrib.block_size) {
866 case 4096:
867 return lb << 3;
868 case 2048:
869 return lb << 2;
870 case 1024:
871 return lb << 1;
872 default:
873 return lb;
874 }
875 }
876 EXPORT_SYMBOL(target_to_linux_sector);
877
878 int target_configure_device(struct se_device *dev)
879 {
880 struct se_hba *hba = dev->se_hba;
881 int ret;
882
883 if (dev->dev_flags & DF_CONFIGURED) {
884 pr_err("se_dev->se_dev_ptr already set for storage"
885 " object\n");
886 return -EEXIST;
887 }
888
889 ret = dev->transport->configure_device(dev);
890 if (ret)
891 goto out;
892 /*
893 * XXX: there is not much point to have two different values here..
894 */
895 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
896 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
897
898 /*
899 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
900 */
901 dev->dev_attrib.hw_max_sectors =
902 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
903 dev->dev_attrib.hw_block_size);
904 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
905
906 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
907 dev->creation_time = get_jiffies_64();
908
909 ret = core_setup_alua(dev);
910 if (ret)
911 goto out;
912
913 /*
914 * Startup the struct se_device processing thread
915 */
916 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
917 dev->transport->name);
918 if (!dev->tmr_wq) {
919 pr_err("Unable to create tmr workqueue for %s\n",
920 dev->transport->name);
921 ret = -ENOMEM;
922 goto out_free_alua;
923 }
924
925 /*
926 * Setup work_queue for QUEUE_FULL
927 */
928 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
929
930 /*
931 * Preload the initial INQUIRY const values if we are doing
932 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
933 * passthrough because this is being provided by the backend LLD.
934 */
935 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
936 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
937 strncpy(&dev->t10_wwn.model[0],
938 dev->transport->inquiry_prod, 16);
939 strncpy(&dev->t10_wwn.revision[0],
940 dev->transport->inquiry_rev, 4);
941 }
942
943 scsi_dump_inquiry(dev);
944
945 spin_lock(&hba->device_lock);
946 hba->dev_count++;
947 spin_unlock(&hba->device_lock);
948
949 mutex_lock(&g_device_mutex);
950 list_add_tail(&dev->g_dev_node, &g_device_list);
951 mutex_unlock(&g_device_mutex);
952
953 dev->dev_flags |= DF_CONFIGURED;
954
955 return 0;
956
957 out_free_alua:
958 core_alua_free_lu_gp_mem(dev);
959 out:
960 se_release_vpd_for_dev(dev);
961 return ret;
962 }
963
964 void target_free_device(struct se_device *dev)
965 {
966 struct se_hba *hba = dev->se_hba;
967
968 WARN_ON(!list_empty(&dev->dev_sep_list));
969
970 if (dev->dev_flags & DF_CONFIGURED) {
971 destroy_workqueue(dev->tmr_wq);
972
973 mutex_lock(&g_device_mutex);
974 list_del(&dev->g_dev_node);
975 mutex_unlock(&g_device_mutex);
976
977 spin_lock(&hba->device_lock);
978 hba->dev_count--;
979 spin_unlock(&hba->device_lock);
980 }
981
982 core_alua_free_lu_gp_mem(dev);
983 core_alua_set_lba_map(dev, NULL, 0, 0);
984 core_scsi3_free_all_registrations(dev);
985 se_release_vpd_for_dev(dev);
986
987 if (dev->transport->free_prot)
988 dev->transport->free_prot(dev);
989
990 dev->transport->free_device(dev);
991 }
992
993 int core_dev_setup_virtual_lun0(void)
994 {
995 struct se_hba *hba;
996 struct se_device *dev;
997 char buf[] = "rd_pages=8,rd_nullio=1";
998 int ret;
999
1000 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1001 if (IS_ERR(hba))
1002 return PTR_ERR(hba);
1003
1004 dev = target_alloc_device(hba, "virt_lun0");
1005 if (!dev) {
1006 ret = -ENOMEM;
1007 goto out_free_hba;
1008 }
1009
1010 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1011
1012 ret = target_configure_device(dev);
1013 if (ret)
1014 goto out_free_se_dev;
1015
1016 lun0_hba = hba;
1017 g_lun0_dev = dev;
1018 return 0;
1019
1020 out_free_se_dev:
1021 target_free_device(dev);
1022 out_free_hba:
1023 core_delete_hba(hba);
1024 return ret;
1025 }
1026
1027
1028 void core_dev_release_virtual_lun0(void)
1029 {
1030 struct se_hba *hba = lun0_hba;
1031
1032 if (!hba)
1033 return;
1034
1035 if (g_lun0_dev)
1036 target_free_device(g_lun0_dev);
1037 core_delete_hba(hba);
1038 }
1039
1040 /*
1041 * Common CDB parsing for kernel and user passthrough.
1042 */
1043 sense_reason_t
1044 passthrough_parse_cdb(struct se_cmd *cmd,
1045 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1046 {
1047 unsigned char *cdb = cmd->t_task_cdb;
1048
1049 /*
1050 * Clear a lun set in the cdb if the initiator talking to use spoke
1051 * and old standards version, as we can't assume the underlying device
1052 * won't choke up on it.
1053 */
1054 switch (cdb[0]) {
1055 case READ_10: /* SBC - RDProtect */
1056 case READ_12: /* SBC - RDProtect */
1057 case READ_16: /* SBC - RDProtect */
1058 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1059 case VERIFY: /* SBC - VRProtect */
1060 case VERIFY_16: /* SBC - VRProtect */
1061 case WRITE_VERIFY: /* SBC - VRProtect */
1062 case WRITE_VERIFY_12: /* SBC - VRProtect */
1063 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1064 break;
1065 default:
1066 cdb[1] &= 0x1f; /* clear logical unit number */
1067 break;
1068 }
1069
1070 /*
1071 * For REPORT LUNS we always need to emulate the response, for everything
1072 * else, pass it up.
1073 */
1074 if (cdb[0] == REPORT_LUNS) {
1075 cmd->execute_cmd = spc_emulate_report_luns;
1076 return TCM_NO_SENSE;
1077 }
1078
1079 /* Set DATA_CDB flag for ops that should have it */
1080 switch (cdb[0]) {
1081 case READ_6:
1082 case READ_10:
1083 case READ_12:
1084 case READ_16:
1085 case WRITE_6:
1086 case WRITE_10:
1087 case WRITE_12:
1088 case WRITE_16:
1089 case WRITE_VERIFY:
1090 case WRITE_VERIFY_12:
1091 case 0x8e: /* WRITE_VERIFY_16 */
1092 case COMPARE_AND_WRITE:
1093 case XDWRITEREAD_10:
1094 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1095 break;
1096 case VARIABLE_LENGTH_CMD:
1097 switch (get_unaligned_be16(&cdb[8])) {
1098 case READ_32:
1099 case WRITE_32:
1100 case 0x0c: /* WRITE_VERIFY_32 */
1101 case XDWRITEREAD_32:
1102 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1103 break;
1104 }
1105 }
1106
1107 cmd->execute_cmd = exec_cmd;
1108
1109 return TCM_NO_SENSE;
1110 }
1111 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support