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Linux 4.19.133
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blob22e97a93728db14c5e6d72fae451638745d19c73
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 static DEFINE_MUTEX(device_mutex);
53 static LIST_HEAD(device_list);
54 static DEFINE_IDR(devices_idr);
55
56 static struct se_hba *lun0_hba;
57 /* not static, needed by tpg.c */
58 struct se_device *g_lun0_dev;
59
60 sense_reason_t
61 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
62 {
63 struct se_lun *se_lun = NULL;
64 struct se_session *se_sess = se_cmd->se_sess;
65 struct se_node_acl *nacl = se_sess->se_node_acl;
66 struct se_dev_entry *deve;
67 sense_reason_t ret = TCM_NO_SENSE;
68
69 rcu_read_lock();
70 deve = target_nacl_find_deve(nacl, unpacked_lun);
71 if (deve) {
72 atomic_long_inc(&deve->total_cmds);
73
74 if (se_cmd->data_direction == DMA_TO_DEVICE)
75 atomic_long_add(se_cmd->data_length,
76 &deve->write_bytes);
77 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
78 atomic_long_add(se_cmd->data_length,
79 &deve->read_bytes);
80
81 se_lun = rcu_dereference(deve->se_lun);
82
83 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
84 se_lun = NULL;
85 goto out_unlock;
86 }
87
88 se_cmd->se_lun = se_lun;
89 se_cmd->pr_res_key = deve->pr_res_key;
90 se_cmd->orig_fe_lun = unpacked_lun;
91 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
92 se_cmd->lun_ref_active = true;
93
94 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
95 deve->lun_access_ro) {
96 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
97 " Access for 0x%08llx\n",
98 se_cmd->se_tfo->get_fabric_name(),
99 unpacked_lun);
100 rcu_read_unlock();
101 ret = TCM_WRITE_PROTECTED;
102 goto ref_dev;
103 }
104 }
105 out_unlock:
106 rcu_read_unlock();
107
108 if (!se_lun) {
109 /*
110 * Use the se_portal_group->tpg_virt_lun0 to allow for
111 * REPORT_LUNS, et al to be returned when no active
112 * MappedLUN=0 exists for this Initiator Port.
113 */
114 if (unpacked_lun != 0) {
115 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
116 " Access for 0x%08llx\n",
117 se_cmd->se_tfo->get_fabric_name(),
118 unpacked_lun);
119 return TCM_NON_EXISTENT_LUN;
120 }
121
122 se_lun = se_sess->se_tpg->tpg_virt_lun0;
123 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
124 se_cmd->orig_fe_lun = 0;
125 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
126
127 percpu_ref_get(&se_lun->lun_ref);
128 se_cmd->lun_ref_active = true;
129
130 /*
131 * Force WRITE PROTECT for virtual LUN 0
132 */
133 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
134 (se_cmd->data_direction != DMA_NONE)) {
135 ret = TCM_WRITE_PROTECTED;
136 goto ref_dev;
137 }
138 }
139 /*
140 * RCU reference protected by percpu se_lun->lun_ref taken above that
141 * must drop to zero (including initial reference) before this se_lun
142 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
143 * target_core_fabric_configfs.c:target_fabric_port_release
144 */
145 ref_dev:
146 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
147 atomic_long_inc(&se_cmd->se_dev->num_cmds);
148
149 if (se_cmd->data_direction == DMA_TO_DEVICE)
150 atomic_long_add(se_cmd->data_length,
151 &se_cmd->se_dev->write_bytes);
152 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
153 atomic_long_add(se_cmd->data_length,
154 &se_cmd->se_dev->read_bytes);
155
156 return ret;
157 }
158 EXPORT_SYMBOL(transport_lookup_cmd_lun);
159
160 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
161 {
162 struct se_dev_entry *deve;
163 struct se_lun *se_lun = NULL;
164 struct se_session *se_sess = se_cmd->se_sess;
165 struct se_node_acl *nacl = se_sess->se_node_acl;
166 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
167 unsigned long flags;
168
169 rcu_read_lock();
170 deve = target_nacl_find_deve(nacl, unpacked_lun);
171 if (deve) {
172 se_lun = rcu_dereference(deve->se_lun);
173
174 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
175 se_lun = NULL;
176 goto out_unlock;
177 }
178
179 se_cmd->se_lun = se_lun;
180 se_cmd->pr_res_key = deve->pr_res_key;
181 se_cmd->orig_fe_lun = unpacked_lun;
182 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
183 se_cmd->lun_ref_active = true;
184 }
185 out_unlock:
186 rcu_read_unlock();
187
188 if (!se_lun) {
189 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
190 " Access for 0x%08llx\n",
191 se_cmd->se_tfo->get_fabric_name(),
192 unpacked_lun);
193 return -ENODEV;
194 }
195 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
196 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
197
198 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
199 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
200 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
201
202 return 0;
203 }
204 EXPORT_SYMBOL(transport_lookup_tmr_lun);
205
206 bool target_lun_is_rdonly(struct se_cmd *cmd)
207 {
208 struct se_session *se_sess = cmd->se_sess;
209 struct se_dev_entry *deve;
210 bool ret;
211
212 rcu_read_lock();
213 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
214 ret = deve && deve->lun_access_ro;
215 rcu_read_unlock();
216
217 return ret;
218 }
219 EXPORT_SYMBOL(target_lun_is_rdonly);
220
221 /*
222 * This function is called from core_scsi3_emulate_pro_register_and_move()
223 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
224 * when a matching rtpi is found.
225 */
226 struct se_dev_entry *core_get_se_deve_from_rtpi(
227 struct se_node_acl *nacl,
228 u16 rtpi)
229 {
230 struct se_dev_entry *deve;
231 struct se_lun *lun;
232 struct se_portal_group *tpg = nacl->se_tpg;
233
234 rcu_read_lock();
235 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
236 lun = rcu_dereference(deve->se_lun);
237 if (!lun) {
238 pr_err("%s device entries device pointer is"
239 " NULL, but Initiator has access.\n",
240 tpg->se_tpg_tfo->get_fabric_name());
241 continue;
242 }
243 if (lun->lun_rtpi != rtpi)
244 continue;
245
246 kref_get(&deve->pr_kref);
247 rcu_read_unlock();
248
249 return deve;
250 }
251 rcu_read_unlock();
252
253 return NULL;
254 }
255
256 void core_free_device_list_for_node(
257 struct se_node_acl *nacl,
258 struct se_portal_group *tpg)
259 {
260 struct se_dev_entry *deve;
261
262 mutex_lock(&nacl->lun_entry_mutex);
263 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
264 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
265 lockdep_is_held(&nacl->lun_entry_mutex));
266 core_disable_device_list_for_node(lun, deve, nacl, tpg);
267 }
268 mutex_unlock(&nacl->lun_entry_mutex);
269 }
270
271 void core_update_device_list_access(
272 u64 mapped_lun,
273 bool lun_access_ro,
274 struct se_node_acl *nacl)
275 {
276 struct se_dev_entry *deve;
277
278 mutex_lock(&nacl->lun_entry_mutex);
279 deve = target_nacl_find_deve(nacl, mapped_lun);
280 if (deve)
281 deve->lun_access_ro = lun_access_ro;
282 mutex_unlock(&nacl->lun_entry_mutex);
283 }
284
285 /*
286 * Called with rcu_read_lock or nacl->device_list_lock held.
287 */
288 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
289 {
290 struct se_dev_entry *deve;
291
292 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
293 if (deve->mapped_lun == mapped_lun)
294 return deve;
295
296 return NULL;
297 }
298 EXPORT_SYMBOL(target_nacl_find_deve);
299
300 void target_pr_kref_release(struct kref *kref)
301 {
302 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
303 pr_kref);
304 complete(&deve->pr_comp);
305 }
306
307 static void
308 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
309 bool skip_new)
310 {
311 struct se_dev_entry *tmp;
312
313 rcu_read_lock();
314 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
315 if (skip_new && tmp == new)
316 continue;
317 core_scsi3_ua_allocate(tmp, 0x3F,
318 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
319 }
320 rcu_read_unlock();
321 }
322
323 int core_enable_device_list_for_node(
324 struct se_lun *lun,
325 struct se_lun_acl *lun_acl,
326 u64 mapped_lun,
327 bool lun_access_ro,
328 struct se_node_acl *nacl,
329 struct se_portal_group *tpg)
330 {
331 struct se_dev_entry *orig, *new;
332
333 new = kzalloc(sizeof(*new), GFP_KERNEL);
334 if (!new) {
335 pr_err("Unable to allocate se_dev_entry memory\n");
336 return -ENOMEM;
337 }
338
339 spin_lock_init(&new->ua_lock);
340 INIT_LIST_HEAD(&new->ua_list);
341 INIT_LIST_HEAD(&new->lun_link);
342
343 new->mapped_lun = mapped_lun;
344 kref_init(&new->pr_kref);
345 init_completion(&new->pr_comp);
346
347 new->lun_access_ro = lun_access_ro;
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 if (orig->se_lun_acl != NULL) {
366 pr_warn_ratelimited("Detected existing explicit"
367 " se_lun_acl->se_lun_group reference for %s"
368 " mapped_lun: %llu, failing\n",
369 nacl->initiatorname, mapped_lun);
370 mutex_unlock(&nacl->lun_entry_mutex);
371 kfree(new);
372 return -EINVAL;
373 }
374
375 rcu_assign_pointer(new->se_lun, lun);
376 rcu_assign_pointer(new->se_lun_acl, lun_acl);
377 hlist_del_rcu(&orig->link);
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_del(&orig->lun_link);
383 list_add_tail(&new->lun_link, &lun->lun_deve_list);
384 spin_unlock(&lun->lun_deve_lock);
385
386 kref_put(&orig->pr_kref, target_pr_kref_release);
387 wait_for_completion(&orig->pr_comp);
388
389 target_luns_data_has_changed(nacl, new, true);
390 kfree_rcu(orig, rcu_head);
391 return 0;
392 }
393
394 rcu_assign_pointer(new->se_lun, lun);
395 rcu_assign_pointer(new->se_lun_acl, lun_acl);
396 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
397 mutex_unlock(&nacl->lun_entry_mutex);
398
399 spin_lock(&lun->lun_deve_lock);
400 list_add_tail(&new->lun_link, &lun->lun_deve_list);
401 spin_unlock(&lun->lun_deve_lock);
402
403 target_luns_data_has_changed(nacl, new, true);
404 return 0;
405 }
406
407 /*
408 * Called with se_node_acl->lun_entry_mutex held.
409 */
410 void core_disable_device_list_for_node(
411 struct se_lun *lun,
412 struct se_dev_entry *orig,
413 struct se_node_acl *nacl,
414 struct se_portal_group *tpg)
415 {
416 /*
417 * rcu_dereference_raw protected by se_lun->lun_group symlink
418 * reference to se_device->dev_group.
419 */
420 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
421 /*
422 * If the MappedLUN entry is being disabled, the entry in
423 * lun->lun_deve_list must be removed now before clearing the
424 * struct se_dev_entry pointers below as logic in
425 * core_alua_do_transition_tg_pt() depends on these being present.
426 *
427 * deve->se_lun_acl will be NULL for demo-mode created LUNs
428 * that have not been explicitly converted to MappedLUNs ->
429 * struct se_lun_acl, but we remove deve->lun_link from
430 * lun->lun_deve_list. This also means that active UAs and
431 * NodeACL context specific PR metadata for demo-mode
432 * MappedLUN *deve will be released below..
433 */
434 spin_lock(&lun->lun_deve_lock);
435 list_del(&orig->lun_link);
436 spin_unlock(&lun->lun_deve_lock);
437 /*
438 * Disable struct se_dev_entry LUN ACL mapping
439 */
440 core_scsi3_ua_release_all(orig);
441
442 hlist_del_rcu(&orig->link);
443 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
444 orig->lun_access_ro = false;
445 orig->creation_time = 0;
446 orig->attach_count--;
447 /*
448 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
449 * or REGISTER_AND_MOVE PR operation to complete.
450 */
451 kref_put(&orig->pr_kref, target_pr_kref_release);
452 wait_for_completion(&orig->pr_comp);
453
454 rcu_assign_pointer(orig->se_lun, NULL);
455 rcu_assign_pointer(orig->se_lun_acl, NULL);
456
457 kfree_rcu(orig, rcu_head);
458
459 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
460 target_luns_data_has_changed(nacl, NULL, false);
461 }
462
463 /* core_clear_lun_from_tpg():
464 *
465 *
466 */
467 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
468 {
469 struct se_node_acl *nacl;
470 struct se_dev_entry *deve;
471
472 mutex_lock(&tpg->acl_node_mutex);
473 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
474
475 mutex_lock(&nacl->lun_entry_mutex);
476 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
477 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
478 lockdep_is_held(&nacl->lun_entry_mutex));
479
480 if (lun != tmp_lun)
481 continue;
482
483 core_disable_device_list_for_node(lun, deve, nacl, tpg);
484 }
485 mutex_unlock(&nacl->lun_entry_mutex);
486 }
487 mutex_unlock(&tpg->acl_node_mutex);
488 }
489
490 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
491 {
492 struct se_lun *tmp;
493
494 spin_lock(&dev->se_port_lock);
495 if (dev->export_count == 0x0000ffff) {
496 pr_warn("Reached dev->dev_port_count =="
497 " 0x0000ffff\n");
498 spin_unlock(&dev->se_port_lock);
499 return -ENOSPC;
500 }
501 again:
502 /*
503 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
504 * Here is the table from spc4r17 section 7.7.3.8.
505 *
506 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
507 *
508 * Code Description
509 * 0h Reserved
510 * 1h Relative port 1, historically known as port A
511 * 2h Relative port 2, historically known as port B
512 * 3h to FFFFh Relative port 3 through 65 535
513 */
514 lun->lun_rtpi = dev->dev_rpti_counter++;
515 if (!lun->lun_rtpi)
516 goto again;
517
518 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
519 /*
520 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
521 * for 16-bit wrap..
522 */
523 if (lun->lun_rtpi == tmp->lun_rtpi)
524 goto again;
525 }
526 spin_unlock(&dev->se_port_lock);
527
528 return 0;
529 }
530
531 static void se_release_vpd_for_dev(struct se_device *dev)
532 {
533 struct t10_vpd *vpd, *vpd_tmp;
534
535 spin_lock(&dev->t10_wwn.t10_vpd_lock);
536 list_for_each_entry_safe(vpd, vpd_tmp,
537 &dev->t10_wwn.t10_vpd_list, vpd_list) {
538 list_del(&vpd->vpd_list);
539 kfree(vpd);
540 }
541 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
542 }
543
544 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
545 {
546 u32 aligned_max_sectors;
547 u32 alignment;
548 /*
549 * Limit max_sectors to a PAGE_SIZE aligned value for modern
550 * transport_allocate_data_tasks() operation.
551 */
552 alignment = max(1ul, PAGE_SIZE / block_size);
553 aligned_max_sectors = rounddown(max_sectors, alignment);
554
555 if (max_sectors != aligned_max_sectors)
556 pr_info("Rounding down aligned max_sectors from %u to %u\n",
557 max_sectors, aligned_max_sectors);
558
559 return aligned_max_sectors;
560 }
561
562 int core_dev_add_lun(
563 struct se_portal_group *tpg,
564 struct se_device *dev,
565 struct se_lun *lun)
566 {
567 int rc;
568
569 rc = core_tpg_add_lun(tpg, lun, false, dev);
570 if (rc < 0)
571 return rc;
572
573 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
574 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
575 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
576 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
577 /*
578 * Update LUN maps for dynamically added initiators when
579 * generate_node_acl is enabled.
580 */
581 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
582 struct se_node_acl *acl;
583
584 mutex_lock(&tpg->acl_node_mutex);
585 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
586 if (acl->dynamic_node_acl &&
587 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
588 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
589 core_tpg_add_node_to_devs(acl, tpg, lun);
590 }
591 }
592 mutex_unlock(&tpg->acl_node_mutex);
593 }
594
595 return 0;
596 }
597
598 /* core_dev_del_lun():
599 *
600 *
601 */
602 void core_dev_del_lun(
603 struct se_portal_group *tpg,
604 struct se_lun *lun)
605 {
606 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
607 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
608 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
609 tpg->se_tpg_tfo->get_fabric_name());
610
611 core_tpg_remove_lun(tpg, lun);
612 }
613
614 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
615 struct se_portal_group *tpg,
616 struct se_node_acl *nacl,
617 u64 mapped_lun,
618 int *ret)
619 {
620 struct se_lun_acl *lacl;
621
622 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
623 pr_err("%s InitiatorName exceeds maximum size.\n",
624 tpg->se_tpg_tfo->get_fabric_name());
625 *ret = -EOVERFLOW;
626 return NULL;
627 }
628 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
629 if (!lacl) {
630 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
631 *ret = -ENOMEM;
632 return NULL;
633 }
634
635 lacl->mapped_lun = mapped_lun;
636 lacl->se_lun_nacl = nacl;
637
638 return lacl;
639 }
640
641 int core_dev_add_initiator_node_lun_acl(
642 struct se_portal_group *tpg,
643 struct se_lun_acl *lacl,
644 struct se_lun *lun,
645 bool lun_access_ro)
646 {
647 struct se_node_acl *nacl = lacl->se_lun_nacl;
648 /*
649 * rcu_dereference_raw protected by se_lun->lun_group symlink
650 * reference to se_device->dev_group.
651 */
652 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
653
654 if (!nacl)
655 return -EINVAL;
656
657 if (lun->lun_access_ro)
658 lun_access_ro = true;
659
660 lacl->se_lun = lun;
661
662 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
663 lun_access_ro, nacl, tpg) < 0)
664 return -EINVAL;
665
666 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
667 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
668 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
669 lun_access_ro ? "RO" : "RW",
670 nacl->initiatorname);
671 /*
672 * Check to see if there are any existing persistent reservation APTPL
673 * pre-registrations that need to be enabled for this LUN ACL..
674 */
675 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
676 lacl->mapped_lun);
677 return 0;
678 }
679
680 int core_dev_del_initiator_node_lun_acl(
681 struct se_lun *lun,
682 struct se_lun_acl *lacl)
683 {
684 struct se_portal_group *tpg = lun->lun_tpg;
685 struct se_node_acl *nacl;
686 struct se_dev_entry *deve;
687
688 nacl = lacl->se_lun_nacl;
689 if (!nacl)
690 return -EINVAL;
691
692 mutex_lock(&nacl->lun_entry_mutex);
693 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
694 if (deve)
695 core_disable_device_list_for_node(lun, deve, nacl, tpg);
696 mutex_unlock(&nacl->lun_entry_mutex);
697
698 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
699 " InitiatorNode: %s Mapped LUN: %llu\n",
700 tpg->se_tpg_tfo->get_fabric_name(),
701 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
702 nacl->initiatorname, lacl->mapped_lun);
703
704 return 0;
705 }
706
707 void core_dev_free_initiator_node_lun_acl(
708 struct se_portal_group *tpg,
709 struct se_lun_acl *lacl)
710 {
711 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
712 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
713 tpg->se_tpg_tfo->tpg_get_tag(tpg),
714 tpg->se_tpg_tfo->get_fabric_name(),
715 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
716
717 kfree(lacl);
718 }
719
720 static void scsi_dump_inquiry(struct se_device *dev)
721 {
722 struct t10_wwn *wwn = &dev->t10_wwn;
723 char buf[17];
724 int i, device_type;
725 /*
726 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
727 */
728 for (i = 0; i < 8; i++)
729 if (wwn->vendor[i] >= 0x20)
730 buf[i] = wwn->vendor[i];
731 else
732 buf[i] = ' ';
733 buf[i] = '\0';
734 pr_debug(" Vendor: %s\n", buf);
735
736 for (i = 0; i < 16; i++)
737 if (wwn->model[i] >= 0x20)
738 buf[i] = wwn->model[i];
739 else
740 buf[i] = ' ';
741 buf[i] = '\0';
742 pr_debug(" Model: %s\n", buf);
743
744 for (i = 0; i < 4; i++)
745 if (wwn->revision[i] >= 0x20)
746 buf[i] = wwn->revision[i];
747 else
748 buf[i] = ' ';
749 buf[i] = '\0';
750 pr_debug(" Revision: %s\n", buf);
751
752 device_type = dev->transport->get_device_type(dev);
753 pr_debug(" Type: %s ", scsi_device_type(device_type));
754 }
755
756 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
757 {
758 struct se_device *dev;
759 struct se_lun *xcopy_lun;
760
761 dev = hba->backend->ops->alloc_device(hba, name);
762 if (!dev)
763 return NULL;
764
765 dev->se_hba = hba;
766 dev->transport = hba->backend->ops;
767 dev->prot_length = sizeof(struct t10_pi_tuple);
768 dev->hba_index = hba->hba_index;
769
770 INIT_LIST_HEAD(&dev->dev_sep_list);
771 INIT_LIST_HEAD(&dev->dev_tmr_list);
772 INIT_LIST_HEAD(&dev->delayed_cmd_list);
773 INIT_LIST_HEAD(&dev->state_list);
774 INIT_LIST_HEAD(&dev->qf_cmd_list);
775 spin_lock_init(&dev->execute_task_lock);
776 spin_lock_init(&dev->delayed_cmd_lock);
777 spin_lock_init(&dev->dev_reservation_lock);
778 spin_lock_init(&dev->se_port_lock);
779 spin_lock_init(&dev->se_tmr_lock);
780 spin_lock_init(&dev->qf_cmd_lock);
781 sema_init(&dev->caw_sem, 1);
782 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
783 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
784 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
785 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
786 spin_lock_init(&dev->t10_pr.registration_lock);
787 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
788 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
789 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
790 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
791 spin_lock_init(&dev->t10_alua.lba_map_lock);
792
793 dev->t10_wwn.t10_dev = dev;
794 dev->t10_alua.t10_dev = dev;
795
796 dev->dev_attrib.da_dev = dev;
797 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
798 dev->dev_attrib.emulate_dpo = 1;
799 dev->dev_attrib.emulate_fua_write = 1;
800 dev->dev_attrib.emulate_fua_read = 1;
801 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
802 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
803 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
804 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
805 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
806 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
807 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
808 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
809 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
810 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
811 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
812 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
813 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
814 dev->dev_attrib.max_unmap_block_desc_count =
815 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
816 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
817 dev->dev_attrib.unmap_granularity_alignment =
818 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
819 dev->dev_attrib.unmap_zeroes_data =
820 DA_UNMAP_ZEROES_DATA_DEFAULT;
821 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
822
823 xcopy_lun = &dev->xcopy_lun;
824 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
825 init_completion(&xcopy_lun->lun_ref_comp);
826 init_completion(&xcopy_lun->lun_shutdown_comp);
827 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
828 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
829 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
830 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
831
832 return dev;
833 }
834
835 /*
836 * Check if the underlying struct block_device request_queue supports
837 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
838 * in ATA and we need to set TPE=1
839 */
840 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
841 struct request_queue *q)
842 {
843 int block_size = queue_logical_block_size(q);
844
845 if (!blk_queue_discard(q))
846 return false;
847
848 attrib->max_unmap_lba_count =
849 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
850 /*
851 * Currently hardcoded to 1 in Linux/SCSI code..
852 */
853 attrib->max_unmap_block_desc_count = 1;
854 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
855 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
856 block_size;
857 attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
858 return true;
859 }
860 EXPORT_SYMBOL(target_configure_unmap_from_queue);
861
862 /*
863 * Convert from blocksize advertised to the initiator to the 512 byte
864 * units unconditionally used by the Linux block layer.
865 */
866 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
867 {
868 switch (dev->dev_attrib.block_size) {
869 case 4096:
870 return lb << 3;
871 case 2048:
872 return lb << 2;
873 case 1024:
874 return lb << 1;
875 default:
876 return lb;
877 }
878 }
879 EXPORT_SYMBOL(target_to_linux_sector);
880
881 struct devices_idr_iter {
882 struct config_item *prev_item;
883 int (*fn)(struct se_device *dev, void *data);
884 void *data;
885 };
886
887 static int target_devices_idr_iter(int id, void *p, void *data)
888 __must_hold(&device_mutex)
889 {
890 struct devices_idr_iter *iter = data;
891 struct se_device *dev = p;
892 int ret;
893
894 config_item_put(iter->prev_item);
895 iter->prev_item = NULL;
896
897 /*
898 * We add the device early to the idr, so it can be used
899 * by backend modules during configuration. We do not want
900 * to allow other callers to access partially setup devices,
901 * so we skip them here.
902 */
903 if (!target_dev_configured(dev))
904 return 0;
905
906 iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
907 if (!iter->prev_item)
908 return 0;
909 mutex_unlock(&device_mutex);
910
911 ret = iter->fn(dev, iter->data);
912
913 mutex_lock(&device_mutex);
914 return ret;
915 }
916
917 /**
918 * target_for_each_device - iterate over configured devices
919 * @fn: iterator function
920 * @data: pointer to data that will be passed to fn
921 *
922 * fn must return 0 to continue looping over devices. non-zero will break
923 * from the loop and return that value to the caller.
924 */
925 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
926 void *data)
927 {
928 struct devices_idr_iter iter = { .fn = fn, .data = data };
929 int ret;
930
931 mutex_lock(&device_mutex);
932 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
933 mutex_unlock(&device_mutex);
934 config_item_put(iter.prev_item);
935 return ret;
936 }
937
938 int target_configure_device(struct se_device *dev)
939 {
940 struct se_hba *hba = dev->se_hba;
941 int ret, id;
942
943 if (target_dev_configured(dev)) {
944 pr_err("se_dev->se_dev_ptr already set for storage"
945 " object\n");
946 return -EEXIST;
947 }
948
949 /*
950 * Add early so modules like tcmu can use during its
951 * configuration.
952 */
953 mutex_lock(&device_mutex);
954 /*
955 * Use cyclic to try and avoid collisions with devices
956 * that were recently removed.
957 */
958 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
959 mutex_unlock(&device_mutex);
960 if (id < 0) {
961 ret = -ENOMEM;
962 goto out;
963 }
964 dev->dev_index = id;
965
966 ret = dev->transport->configure_device(dev);
967 if (ret)
968 goto out_free_index;
969 /*
970 * XXX: there is not much point to have two different values here..
971 */
972 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
973 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
974
975 /*
976 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
977 */
978 dev->dev_attrib.hw_max_sectors =
979 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
980 dev->dev_attrib.hw_block_size);
981 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
982
983 dev->creation_time = get_jiffies_64();
984
985 ret = core_setup_alua(dev);
986 if (ret)
987 goto out_destroy_device;
988
989 /*
990 * Startup the struct se_device processing thread
991 */
992 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
993 dev->transport->name);
994 if (!dev->tmr_wq) {
995 pr_err("Unable to create tmr workqueue for %s\n",
996 dev->transport->name);
997 ret = -ENOMEM;
998 goto out_free_alua;
999 }
1000
1001 /*
1002 * Setup work_queue for QUEUE_FULL
1003 */
1004 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1005
1006 /*
1007 * Preload the initial INQUIRY const values if we are doing
1008 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1009 * passthrough because this is being provided by the backend LLD.
1010 */
1011 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1012 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1013 strncpy(&dev->t10_wwn.model[0],
1014 dev->transport->inquiry_prod, 16);
1015 strncpy(&dev->t10_wwn.revision[0],
1016 dev->transport->inquiry_rev, 4);
1017 }
1018
1019 scsi_dump_inquiry(dev);
1020
1021 spin_lock(&hba->device_lock);
1022 hba->dev_count++;
1023 spin_unlock(&hba->device_lock);
1024
1025 dev->dev_flags |= DF_CONFIGURED;
1026
1027 return 0;
1028
1029 out_free_alua:
1030 core_alua_free_lu_gp_mem(dev);
1031 out_destroy_device:
1032 dev->transport->destroy_device(dev);
1033 out_free_index:
1034 mutex_lock(&device_mutex);
1035 idr_remove(&devices_idr, dev->dev_index);
1036 mutex_unlock(&device_mutex);
1037 out:
1038 se_release_vpd_for_dev(dev);
1039 return ret;
1040 }
1041
1042 void target_free_device(struct se_device *dev)
1043 {
1044 struct se_hba *hba = dev->se_hba;
1045
1046 WARN_ON(!list_empty(&dev->dev_sep_list));
1047
1048 if (target_dev_configured(dev)) {
1049 destroy_workqueue(dev->tmr_wq);
1050
1051 dev->transport->destroy_device(dev);
1052
1053 mutex_lock(&device_mutex);
1054 idr_remove(&devices_idr, dev->dev_index);
1055 mutex_unlock(&device_mutex);
1056
1057 spin_lock(&hba->device_lock);
1058 hba->dev_count--;
1059 spin_unlock(&hba->device_lock);
1060 }
1061
1062 core_alua_free_lu_gp_mem(dev);
1063 core_alua_set_lba_map(dev, NULL, 0, 0);
1064 core_scsi3_free_all_registrations(dev);
1065 se_release_vpd_for_dev(dev);
1066
1067 if (dev->transport->free_prot)
1068 dev->transport->free_prot(dev);
1069
1070 dev->transport->free_device(dev);
1071 }
1072
1073 int core_dev_setup_virtual_lun0(void)
1074 {
1075 struct se_hba *hba;
1076 struct se_device *dev;
1077 char buf[] = "rd_pages=8,rd_nullio=1";
1078 int ret;
1079
1080 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1081 if (IS_ERR(hba))
1082 return PTR_ERR(hba);
1083
1084 dev = target_alloc_device(hba, "virt_lun0");
1085 if (!dev) {
1086 ret = -ENOMEM;
1087 goto out_free_hba;
1088 }
1089
1090 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1091
1092 ret = target_configure_device(dev);
1093 if (ret)
1094 goto out_free_se_dev;
1095
1096 lun0_hba = hba;
1097 g_lun0_dev = dev;
1098 return 0;
1099
1100 out_free_se_dev:
1101 target_free_device(dev);
1102 out_free_hba:
1103 core_delete_hba(hba);
1104 return ret;
1105 }
1106
1107
1108 void core_dev_release_virtual_lun0(void)
1109 {
1110 struct se_hba *hba = lun0_hba;
1111
1112 if (!hba)
1113 return;
1114
1115 if (g_lun0_dev)
1116 target_free_device(g_lun0_dev);
1117 core_delete_hba(hba);
1118 }
1119
1120 /*
1121 * Common CDB parsing for kernel and user passthrough.
1122 */
1123 sense_reason_t
1124 passthrough_parse_cdb(struct se_cmd *cmd,
1125 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1126 {
1127 unsigned char *cdb = cmd->t_task_cdb;
1128 struct se_device *dev = cmd->se_dev;
1129 unsigned int size;
1130
1131 /*
1132 * For REPORT LUNS we always need to emulate the response, for everything
1133 * else, pass it up.
1134 */
1135 if (cdb[0] == REPORT_LUNS) {
1136 cmd->execute_cmd = spc_emulate_report_luns;
1137 return TCM_NO_SENSE;
1138 }
1139
1140 /*
1141 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1142 * emulate the response, since tcmu does not have the information
1143 * required to process these commands.
1144 */
1145 if (!(dev->transport->transport_flags &
1146 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1147 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1148 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1149 size = get_unaligned_be16(&cdb[7]);
1150 return target_cmd_size_check(cmd, size);
1151 }
1152 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1153 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1154 size = get_unaligned_be32(&cdb[5]);
1155 return target_cmd_size_check(cmd, size);
1156 }
1157
1158 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1159 cmd->execute_cmd = target_scsi2_reservation_release;
1160 if (cdb[0] == RELEASE_10)
1161 size = get_unaligned_be16(&cdb[7]);
1162 else
1163 size = cmd->data_length;
1164 return target_cmd_size_check(cmd, size);
1165 }
1166 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1167 cmd->execute_cmd = target_scsi2_reservation_reserve;
1168 if (cdb[0] == RESERVE_10)
1169 size = get_unaligned_be16(&cdb[7]);
1170 else
1171 size = cmd->data_length;
1172 return target_cmd_size_check(cmd, size);
1173 }
1174 }
1175
1176 /* Set DATA_CDB flag for ops that should have it */
1177 switch (cdb[0]) {
1178 case READ_6:
1179 case READ_10:
1180 case READ_12:
1181 case READ_16:
1182 case WRITE_6:
1183 case WRITE_10:
1184 case WRITE_12:
1185 case WRITE_16:
1186 case WRITE_VERIFY:
1187 case WRITE_VERIFY_12:
1188 case WRITE_VERIFY_16:
1189 case COMPARE_AND_WRITE:
1190 case XDWRITEREAD_10:
1191 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1192 break;
1193 case VARIABLE_LENGTH_CMD:
1194 switch (get_unaligned_be16(&cdb[8])) {
1195 case READ_32:
1196 case WRITE_32:
1197 case WRITE_VERIFY_32:
1198 case XDWRITEREAD_32:
1199 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1200 break;
1201 }
1202 }
1203
1204 cmd->execute_cmd = exec_cmd;
1205
1206 return TCM_NO_SENSE;
1207 }
1208 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support