?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blob88ea4e4f124b2113cf686f470aed171706304a94
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_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
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_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
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 u32 lun_access,
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 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
270 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
271 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
272 } else {
273 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
274 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
275 }
276 }
277 mutex_unlock(&nacl->lun_entry_mutex);
278 }
279
280 /*
281 * Called with rcu_read_lock or nacl->device_list_lock held.
282 */
283 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
284 {
285 struct se_dev_entry *deve;
286
287 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
288 if (deve->mapped_lun == mapped_lun)
289 return deve;
290
291 return NULL;
292 }
293 EXPORT_SYMBOL(target_nacl_find_deve);
294
295 void target_pr_kref_release(struct kref *kref)
296 {
297 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
298 pr_kref);
299 complete(&deve->pr_comp);
300 }
301
302 static void
303 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
304 bool skip_new)
305 {
306 struct se_dev_entry *tmp;
307
308 rcu_read_lock();
309 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
310 if (skip_new && tmp == new)
311 continue;
312 core_scsi3_ua_allocate(tmp, 0x3F,
313 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
314 }
315 rcu_read_unlock();
316 }
317
318 int core_enable_device_list_for_node(
319 struct se_lun *lun,
320 struct se_lun_acl *lun_acl,
321 u64 mapped_lun,
322 u32 lun_access,
323 struct se_node_acl *nacl,
324 struct se_portal_group *tpg)
325 {
326 struct se_dev_entry *orig, *new;
327
328 new = kzalloc(sizeof(*new), GFP_KERNEL);
329 if (!new) {
330 pr_err("Unable to allocate se_dev_entry memory\n");
331 return -ENOMEM;
332 }
333
334 atomic_set(&new->ua_count, 0);
335 spin_lock_init(&new->ua_lock);
336 INIT_LIST_HEAD(&new->ua_list);
337 INIT_LIST_HEAD(&new->lun_link);
338
339 new->mapped_lun = mapped_lun;
340 kref_init(&new->pr_kref);
341 init_completion(&new->pr_comp);
342
343 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
344 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
345 else
346 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
347
348 new->creation_time = get_jiffies_64();
349 new->attach_count++;
350
351 mutex_lock(&nacl->lun_entry_mutex);
352 orig = target_nacl_find_deve(nacl, mapped_lun);
353 if (orig && orig->se_lun) {
354 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
355 lockdep_is_held(&nacl->lun_entry_mutex));
356
357 if (orig_lun != lun) {
358 pr_err("Existing orig->se_lun doesn't match new lun"
359 " for dynamic -> explicit NodeACL conversion:"
360 " %s\n", nacl->initiatorname);
361 mutex_unlock(&nacl->lun_entry_mutex);
362 kfree(new);
363 return -EINVAL;
364 }
365 BUG_ON(orig->se_lun_acl != NULL);
366
367 rcu_assign_pointer(new->se_lun, lun);
368 rcu_assign_pointer(new->se_lun_acl, lun_acl);
369 hlist_del_rcu(&orig->link);
370 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
371 mutex_unlock(&nacl->lun_entry_mutex);
372
373 spin_lock(&lun->lun_deve_lock);
374 list_del(&orig->lun_link);
375 list_add_tail(&new->lun_link, &lun->lun_deve_list);
376 spin_unlock(&lun->lun_deve_lock);
377
378 kref_put(&orig->pr_kref, target_pr_kref_release);
379 wait_for_completion(&orig->pr_comp);
380
381 target_luns_data_has_changed(nacl, new, true);
382 kfree_rcu(orig, rcu_head);
383 return 0;
384 }
385
386 rcu_assign_pointer(new->se_lun, lun);
387 rcu_assign_pointer(new->se_lun_acl, lun_acl);
388 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
389 mutex_unlock(&nacl->lun_entry_mutex);
390
391 spin_lock(&lun->lun_deve_lock);
392 list_add_tail(&new->lun_link, &lun->lun_deve_list);
393 spin_unlock(&lun->lun_deve_lock);
394
395 target_luns_data_has_changed(nacl, new, true);
396 return 0;
397 }
398
399 /*
400 * Called with se_node_acl->lun_entry_mutex held.
401 */
402 void core_disable_device_list_for_node(
403 struct se_lun *lun,
404 struct se_dev_entry *orig,
405 struct se_node_acl *nacl,
406 struct se_portal_group *tpg)
407 {
408 /*
409 * rcu_dereference_raw protected by se_lun->lun_group symlink
410 * reference to se_device->dev_group.
411 */
412 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
413 /*
414 * If the MappedLUN entry is being disabled, the entry in
415 * lun->lun_deve_list must be removed now before clearing the
416 * struct se_dev_entry pointers below as logic in
417 * core_alua_do_transition_tg_pt() depends on these being present.
418 *
419 * deve->se_lun_acl will be NULL for demo-mode created LUNs
420 * that have not been explicitly converted to MappedLUNs ->
421 * struct se_lun_acl, but we remove deve->lun_link from
422 * lun->lun_deve_list. This also means that active UAs and
423 * NodeACL context specific PR metadata for demo-mode
424 * MappedLUN *deve will be released below..
425 */
426 spin_lock(&lun->lun_deve_lock);
427 list_del(&orig->lun_link);
428 spin_unlock(&lun->lun_deve_lock);
429 /*
430 * Disable struct se_dev_entry LUN ACL mapping
431 */
432 core_scsi3_ua_release_all(orig);
433
434 hlist_del_rcu(&orig->link);
435 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
436 orig->lun_flags = 0;
437 orig->creation_time = 0;
438 orig->attach_count--;
439 /*
440 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
441 * or REGISTER_AND_MOVE PR operation to complete.
442 */
443 kref_put(&orig->pr_kref, target_pr_kref_release);
444 wait_for_completion(&orig->pr_comp);
445
446 rcu_assign_pointer(orig->se_lun, NULL);
447 rcu_assign_pointer(orig->se_lun_acl, NULL);
448
449 kfree_rcu(orig, rcu_head);
450
451 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
452 target_luns_data_has_changed(nacl, NULL, false);
453 }
454
455 /* core_clear_lun_from_tpg():
456 *
457 *
458 */
459 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
460 {
461 struct se_node_acl *nacl;
462 struct se_dev_entry *deve;
463
464 mutex_lock(&tpg->acl_node_mutex);
465 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
466
467 mutex_lock(&nacl->lun_entry_mutex);
468 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
469 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
470 lockdep_is_held(&nacl->lun_entry_mutex));
471
472 if (lun != tmp_lun)
473 continue;
474
475 core_disable_device_list_for_node(lun, deve, nacl, tpg);
476 }
477 mutex_unlock(&nacl->lun_entry_mutex);
478 }
479 mutex_unlock(&tpg->acl_node_mutex);
480 }
481
482 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
483 {
484 struct se_lun *tmp;
485
486 spin_lock(&dev->se_port_lock);
487 if (dev->export_count == 0x0000ffff) {
488 pr_warn("Reached dev->dev_port_count =="
489 " 0x0000ffff\n");
490 spin_unlock(&dev->se_port_lock);
491 return -ENOSPC;
492 }
493 again:
494 /*
495 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
496 * Here is the table from spc4r17 section 7.7.3.8.
497 *
498 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
499 *
500 * Code Description
501 * 0h Reserved
502 * 1h Relative port 1, historically known as port A
503 * 2h Relative port 2, historically known as port B
504 * 3h to FFFFh Relative port 3 through 65 535
505 */
506 lun->lun_rtpi = dev->dev_rpti_counter++;
507 if (!lun->lun_rtpi)
508 goto again;
509
510 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
511 /*
512 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
513 * for 16-bit wrap..
514 */
515 if (lun->lun_rtpi == tmp->lun_rtpi)
516 goto again;
517 }
518 spin_unlock(&dev->se_port_lock);
519
520 return 0;
521 }
522
523 static void se_release_vpd_for_dev(struct se_device *dev)
524 {
525 struct t10_vpd *vpd, *vpd_tmp;
526
527 spin_lock(&dev->t10_wwn.t10_vpd_lock);
528 list_for_each_entry_safe(vpd, vpd_tmp,
529 &dev->t10_wwn.t10_vpd_list, vpd_list) {
530 list_del(&vpd->vpd_list);
531 kfree(vpd);
532 }
533 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
534 }
535
536 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
537 {
538 u32 aligned_max_sectors;
539 u32 alignment;
540 /*
541 * Limit max_sectors to a PAGE_SIZE aligned value for modern
542 * transport_allocate_data_tasks() operation.
543 */
544 alignment = max(1ul, PAGE_SIZE / block_size);
545 aligned_max_sectors = rounddown(max_sectors, alignment);
546
547 if (max_sectors != aligned_max_sectors)
548 pr_info("Rounding down aligned max_sectors from %u to %u\n",
549 max_sectors, aligned_max_sectors);
550
551 return aligned_max_sectors;
552 }
553
554 int core_dev_add_lun(
555 struct se_portal_group *tpg,
556 struct se_device *dev,
557 struct se_lun *lun)
558 {
559 int rc;
560
561 rc = core_tpg_add_lun(tpg, lun,
562 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
563 if (rc < 0)
564 return rc;
565
566 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
567 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
568 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
569 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
570 /*
571 * Update LUN maps for dynamically added initiators when
572 * generate_node_acl is enabled.
573 */
574 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
575 struct se_node_acl *acl;
576
577 mutex_lock(&tpg->acl_node_mutex);
578 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
579 if (acl->dynamic_node_acl &&
580 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
581 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
582 core_tpg_add_node_to_devs(acl, tpg, lun);
583 }
584 }
585 mutex_unlock(&tpg->acl_node_mutex);
586 }
587
588 return 0;
589 }
590
591 /* core_dev_del_lun():
592 *
593 *
594 */
595 void core_dev_del_lun(
596 struct se_portal_group *tpg,
597 struct se_lun *lun)
598 {
599 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
600 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
601 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
602 tpg->se_tpg_tfo->get_fabric_name());
603
604 core_tpg_remove_lun(tpg, lun);
605 }
606
607 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
608 struct se_portal_group *tpg,
609 struct se_node_acl *nacl,
610 u64 mapped_lun,
611 int *ret)
612 {
613 struct se_lun_acl *lacl;
614
615 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
616 pr_err("%s InitiatorName exceeds maximum size.\n",
617 tpg->se_tpg_tfo->get_fabric_name());
618 *ret = -EOVERFLOW;
619 return NULL;
620 }
621 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
622 if (!lacl) {
623 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
624 *ret = -ENOMEM;
625 return NULL;
626 }
627
628 lacl->mapped_lun = mapped_lun;
629 lacl->se_lun_nacl = nacl;
630
631 return lacl;
632 }
633
634 int core_dev_add_initiator_node_lun_acl(
635 struct se_portal_group *tpg,
636 struct se_lun_acl *lacl,
637 struct se_lun *lun,
638 u32 lun_access)
639 {
640 struct se_node_acl *nacl = lacl->se_lun_nacl;
641 /*
642 * rcu_dereference_raw protected by se_lun->lun_group symlink
643 * reference to se_device->dev_group.
644 */
645 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
646
647 if (!nacl)
648 return -EINVAL;
649
650 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
651 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
652 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
653
654 lacl->se_lun = lun;
655
656 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
657 lun_access, 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 & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
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.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
817
818 xcopy_lun = &dev->xcopy_lun;
819 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
820 init_completion(&xcopy_lun->lun_ref_comp);
821 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
822 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
823 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
824 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
825
826 return dev;
827 }
828
829 int target_configure_device(struct se_device *dev)
830 {
831 struct se_hba *hba = dev->se_hba;
832 int ret;
833
834 if (dev->dev_flags & DF_CONFIGURED) {
835 pr_err("se_dev->se_dev_ptr already set for storage"
836 " object\n");
837 return -EEXIST;
838 }
839
840 ret = dev->transport->configure_device(dev);
841 if (ret)
842 goto out;
843 /*
844 * XXX: there is not much point to have two different values here..
845 */
846 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
847 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
848
849 /*
850 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
851 */
852 dev->dev_attrib.hw_max_sectors =
853 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
854 dev->dev_attrib.hw_block_size);
855 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
856
857 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
858 dev->creation_time = get_jiffies_64();
859
860 ret = core_setup_alua(dev);
861 if (ret)
862 goto out;
863
864 /*
865 * Startup the struct se_device processing thread
866 */
867 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
868 dev->transport->name);
869 if (!dev->tmr_wq) {
870 pr_err("Unable to create tmr workqueue for %s\n",
871 dev->transport->name);
872 ret = -ENOMEM;
873 goto out_free_alua;
874 }
875
876 /*
877 * Setup work_queue for QUEUE_FULL
878 */
879 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
880
881 /*
882 * Preload the initial INQUIRY const values if we are doing
883 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
884 * passthrough because this is being provided by the backend LLD.
885 */
886 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
887 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
888 strncpy(&dev->t10_wwn.model[0],
889 dev->transport->inquiry_prod, 16);
890 strncpy(&dev->t10_wwn.revision[0],
891 dev->transport->inquiry_rev, 4);
892 }
893
894 scsi_dump_inquiry(dev);
895
896 spin_lock(&hba->device_lock);
897 hba->dev_count++;
898 spin_unlock(&hba->device_lock);
899
900 mutex_lock(&g_device_mutex);
901 list_add_tail(&dev->g_dev_node, &g_device_list);
902 mutex_unlock(&g_device_mutex);
903
904 dev->dev_flags |= DF_CONFIGURED;
905
906 return 0;
907
908 out_free_alua:
909 core_alua_free_lu_gp_mem(dev);
910 out:
911 se_release_vpd_for_dev(dev);
912 return ret;
913 }
914
915 void target_free_device(struct se_device *dev)
916 {
917 struct se_hba *hba = dev->se_hba;
918
919 WARN_ON(!list_empty(&dev->dev_sep_list));
920
921 if (dev->dev_flags & DF_CONFIGURED) {
922 destroy_workqueue(dev->tmr_wq);
923
924 mutex_lock(&g_device_mutex);
925 list_del(&dev->g_dev_node);
926 mutex_unlock(&g_device_mutex);
927
928 spin_lock(&hba->device_lock);
929 hba->dev_count--;
930 spin_unlock(&hba->device_lock);
931 }
932
933 core_alua_free_lu_gp_mem(dev);
934 core_alua_set_lba_map(dev, NULL, 0, 0);
935 core_scsi3_free_all_registrations(dev);
936 se_release_vpd_for_dev(dev);
937
938 if (dev->transport->free_prot)
939 dev->transport->free_prot(dev);
940
941 dev->transport->free_device(dev);
942 }
943
944 int core_dev_setup_virtual_lun0(void)
945 {
946 struct se_hba *hba;
947 struct se_device *dev;
948 char buf[] = "rd_pages=8,rd_nullio=1";
949 int ret;
950
951 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
952 if (IS_ERR(hba))
953 return PTR_ERR(hba);
954
955 dev = target_alloc_device(hba, "virt_lun0");
956 if (!dev) {
957 ret = -ENOMEM;
958 goto out_free_hba;
959 }
960
961 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
962
963 ret = target_configure_device(dev);
964 if (ret)
965 goto out_free_se_dev;
966
967 lun0_hba = hba;
968 g_lun0_dev = dev;
969 return 0;
970
971 out_free_se_dev:
972 target_free_device(dev);
973 out_free_hba:
974 core_delete_hba(hba);
975 return ret;
976 }
977
978
979 void core_dev_release_virtual_lun0(void)
980 {
981 struct se_hba *hba = lun0_hba;
982
983 if (!hba)
984 return;
985
986 if (g_lun0_dev)
987 target_free_device(g_lun0_dev);
988 core_delete_hba(hba);
989 }
990
991 /*
992 * Common CDB parsing for kernel and user passthrough.
993 */
994 sense_reason_t
995 passthrough_parse_cdb(struct se_cmd *cmd,
996 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
997 {
998 unsigned char *cdb = cmd->t_task_cdb;
999
1000 /*
1001 * Clear a lun set in the cdb if the initiator talking to use spoke
1002 * and old standards version, as we can't assume the underlying device
1003 * won't choke up on it.
1004 */
1005 switch (cdb[0]) {
1006 case READ_10: /* SBC - RDProtect */
1007 case READ_12: /* SBC - RDProtect */
1008 case READ_16: /* SBC - RDProtect */
1009 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1010 case VERIFY: /* SBC - VRProtect */
1011 case VERIFY_16: /* SBC - VRProtect */
1012 case WRITE_VERIFY: /* SBC - VRProtect */
1013 case WRITE_VERIFY_12: /* SBC - VRProtect */
1014 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1015 break;
1016 default:
1017 cdb[1] &= 0x1f; /* clear logical unit number */
1018 break;
1019 }
1020
1021 /*
1022 * For REPORT LUNS we always need to emulate the response, for everything
1023 * else, pass it up.
1024 */
1025 if (cdb[0] == REPORT_LUNS) {
1026 cmd->execute_cmd = spc_emulate_report_luns;
1027 return TCM_NO_SENSE;
1028 }
1029
1030 /* Set DATA_CDB flag for ops that should have it */
1031 switch (cdb[0]) {
1032 case READ_6:
1033 case READ_10:
1034 case READ_12:
1035 case READ_16:
1036 case WRITE_6:
1037 case WRITE_10:
1038 case WRITE_12:
1039 case WRITE_16:
1040 case WRITE_VERIFY:
1041 case WRITE_VERIFY_12:
1042 case 0x8e: /* WRITE_VERIFY_16 */
1043 case COMPARE_AND_WRITE:
1044 case XDWRITEREAD_10:
1045 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1046 break;
1047 case VARIABLE_LENGTH_CMD:
1048 switch (get_unaligned_be16(&cdb[8])) {
1049 case READ_32:
1050 case WRITE_32:
1051 case 0x0c: /* WRITE_VERIFY_32 */
1052 case XDWRITEREAD_32:
1053 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1054 break;
1055 }
1056 }
1057
1058 cmd->execute_cmd = exec_cmd;
1059
1060 return TCM_NO_SENSE;
1061 }
1062 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support