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f2fs: split discard command in prior to block layer
[linux/fpc-iii.git] / drivers / target / target_core_device.c
blobe27db4d45a9d34bf1e171d298fda4719af1c1725
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 = rcu_dereference(deve->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 = rcu_dereference(deve->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 atomic_set(&new->ua_count, 0);
340 spin_lock_init(&new->ua_lock);
341 INIT_LIST_HEAD(&new->ua_list);
342 INIT_LIST_HEAD(&new->lun_link);
343
344 new->mapped_lun = mapped_lun;
345 kref_init(&new->pr_kref);
346 init_completion(&new->pr_comp);
347
348 new->lun_access_ro = lun_access_ro;
349 new->creation_time = get_jiffies_64();
350 new->attach_count++;
351
352 mutex_lock(&nacl->lun_entry_mutex);
353 orig = target_nacl_find_deve(nacl, mapped_lun);
354 if (orig && orig->se_lun) {
355 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
356 lockdep_is_held(&nacl->lun_entry_mutex));
357
358 if (orig_lun != lun) {
359 pr_err("Existing orig->se_lun doesn't match new lun"
360 " for dynamic -> explicit NodeACL conversion:"
361 " %s\n", nacl->initiatorname);
362 mutex_unlock(&nacl->lun_entry_mutex);
363 kfree(new);
364 return -EINVAL;
365 }
366 if (orig->se_lun_acl != NULL) {
367 pr_warn_ratelimited("Detected existing explicit"
368 " se_lun_acl->se_lun_group reference for %s"
369 " mapped_lun: %llu, failing\n",
370 nacl->initiatorname, mapped_lun);
371 mutex_unlock(&nacl->lun_entry_mutex);
372 kfree(new);
373 return -EINVAL;
374 }
375
376 rcu_assign_pointer(new->se_lun, lun);
377 rcu_assign_pointer(new->se_lun_acl, lun_acl);
378 hlist_del_rcu(&orig->link);
379 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
380 mutex_unlock(&nacl->lun_entry_mutex);
381
382 spin_lock(&lun->lun_deve_lock);
383 list_del(&orig->lun_link);
384 list_add_tail(&new->lun_link, &lun->lun_deve_list);
385 spin_unlock(&lun->lun_deve_lock);
386
387 kref_put(&orig->pr_kref, target_pr_kref_release);
388 wait_for_completion(&orig->pr_comp);
389
390 target_luns_data_has_changed(nacl, new, true);
391 kfree_rcu(orig, rcu_head);
392 return 0;
393 }
394
395 rcu_assign_pointer(new->se_lun, lun);
396 rcu_assign_pointer(new->se_lun_acl, lun_acl);
397 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
398 mutex_unlock(&nacl->lun_entry_mutex);
399
400 spin_lock(&lun->lun_deve_lock);
401 list_add_tail(&new->lun_link, &lun->lun_deve_list);
402 spin_unlock(&lun->lun_deve_lock);
403
404 target_luns_data_has_changed(nacl, new, true);
405 return 0;
406 }
407
408 /*
409 * Called with se_node_acl->lun_entry_mutex held.
410 */
411 void core_disable_device_list_for_node(
412 struct se_lun *lun,
413 struct se_dev_entry *orig,
414 struct se_node_acl *nacl,
415 struct se_portal_group *tpg)
416 {
417 /*
418 * rcu_dereference_raw protected by se_lun->lun_group symlink
419 * reference to se_device->dev_group.
420 */
421 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
422 /*
423 * If the MappedLUN entry is being disabled, the entry in
424 * lun->lun_deve_list must be removed now before clearing the
425 * struct se_dev_entry pointers below as logic in
426 * core_alua_do_transition_tg_pt() depends on these being present.
427 *
428 * deve->se_lun_acl will be NULL for demo-mode created LUNs
429 * that have not been explicitly converted to MappedLUNs ->
430 * struct se_lun_acl, but we remove deve->lun_link from
431 * lun->lun_deve_list. This also means that active UAs and
432 * NodeACL context specific PR metadata for demo-mode
433 * MappedLUN *deve will be released below..
434 */
435 spin_lock(&lun->lun_deve_lock);
436 list_del(&orig->lun_link);
437 spin_unlock(&lun->lun_deve_lock);
438 /*
439 * Disable struct se_dev_entry LUN ACL mapping
440 */
441 core_scsi3_ua_release_all(orig);
442
443 hlist_del_rcu(&orig->link);
444 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
445 orig->lun_access_ro = false;
446 orig->creation_time = 0;
447 orig->attach_count--;
448 /*
449 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
450 * or REGISTER_AND_MOVE PR operation to complete.
451 */
452 kref_put(&orig->pr_kref, target_pr_kref_release);
453 wait_for_completion(&orig->pr_comp);
454
455 rcu_assign_pointer(orig->se_lun, NULL);
456 rcu_assign_pointer(orig->se_lun_acl, NULL);
457
458 kfree_rcu(orig, rcu_head);
459
460 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
461 target_luns_data_has_changed(nacl, NULL, false);
462 }
463
464 /* core_clear_lun_from_tpg():
465 *
466 *
467 */
468 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
469 {
470 struct se_node_acl *nacl;
471 struct se_dev_entry *deve;
472
473 mutex_lock(&tpg->acl_node_mutex);
474 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
475
476 mutex_lock(&nacl->lun_entry_mutex);
477 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
478 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
479 lockdep_is_held(&nacl->lun_entry_mutex));
480
481 if (lun != tmp_lun)
482 continue;
483
484 core_disable_device_list_for_node(lun, deve, nacl, tpg);
485 }
486 mutex_unlock(&nacl->lun_entry_mutex);
487 }
488 mutex_unlock(&tpg->acl_node_mutex);
489 }
490
491 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
492 {
493 struct se_lun *tmp;
494
495 spin_lock(&dev->se_port_lock);
496 if (dev->export_count == 0x0000ffff) {
497 pr_warn("Reached dev->dev_port_count =="
498 " 0x0000ffff\n");
499 spin_unlock(&dev->se_port_lock);
500 return -ENOSPC;
501 }
502 again:
503 /*
504 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
505 * Here is the table from spc4r17 section 7.7.3.8.
506 *
507 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
508 *
509 * Code Description
510 * 0h Reserved
511 * 1h Relative port 1, historically known as port A
512 * 2h Relative port 2, historically known as port B
513 * 3h to FFFFh Relative port 3 through 65 535
514 */
515 lun->lun_rtpi = dev->dev_rpti_counter++;
516 if (!lun->lun_rtpi)
517 goto again;
518
519 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
520 /*
521 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
522 * for 16-bit wrap..
523 */
524 if (lun->lun_rtpi == tmp->lun_rtpi)
525 goto again;
526 }
527 spin_unlock(&dev->se_port_lock);
528
529 return 0;
530 }
531
532 static void se_release_vpd_for_dev(struct se_device *dev)
533 {
534 struct t10_vpd *vpd, *vpd_tmp;
535
536 spin_lock(&dev->t10_wwn.t10_vpd_lock);
537 list_for_each_entry_safe(vpd, vpd_tmp,
538 &dev->t10_wwn.t10_vpd_list, vpd_list) {
539 list_del(&vpd->vpd_list);
540 kfree(vpd);
541 }
542 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
543 }
544
545 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
546 {
547 u32 aligned_max_sectors;
548 u32 alignment;
549 /*
550 * Limit max_sectors to a PAGE_SIZE aligned value for modern
551 * transport_allocate_data_tasks() operation.
552 */
553 alignment = max(1ul, PAGE_SIZE / block_size);
554 aligned_max_sectors = rounddown(max_sectors, alignment);
555
556 if (max_sectors != aligned_max_sectors)
557 pr_info("Rounding down aligned max_sectors from %u to %u\n",
558 max_sectors, aligned_max_sectors);
559
560 return aligned_max_sectors;
561 }
562
563 int core_dev_add_lun(
564 struct se_portal_group *tpg,
565 struct se_device *dev,
566 struct se_lun *lun)
567 {
568 int rc;
569
570 rc = core_tpg_add_lun(tpg, lun, false, dev);
571 if (rc < 0)
572 return rc;
573
574 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
575 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
576 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
577 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
578 /*
579 * Update LUN maps for dynamically added initiators when
580 * generate_node_acl is enabled.
581 */
582 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
583 struct se_node_acl *acl;
584
585 mutex_lock(&tpg->acl_node_mutex);
586 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
587 if (acl->dynamic_node_acl &&
588 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
589 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
590 core_tpg_add_node_to_devs(acl, tpg, lun);
591 }
592 }
593 mutex_unlock(&tpg->acl_node_mutex);
594 }
595
596 return 0;
597 }
598
599 /* core_dev_del_lun():
600 *
601 *
602 */
603 void core_dev_del_lun(
604 struct se_portal_group *tpg,
605 struct se_lun *lun)
606 {
607 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
608 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
609 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
610 tpg->se_tpg_tfo->get_fabric_name());
611
612 core_tpg_remove_lun(tpg, lun);
613 }
614
615 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
616 struct se_portal_group *tpg,
617 struct se_node_acl *nacl,
618 u64 mapped_lun,
619 int *ret)
620 {
621 struct se_lun_acl *lacl;
622
623 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
624 pr_err("%s InitiatorName exceeds maximum size.\n",
625 tpg->se_tpg_tfo->get_fabric_name());
626 *ret = -EOVERFLOW;
627 return NULL;
628 }
629 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
630 if (!lacl) {
631 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
632 *ret = -ENOMEM;
633 return NULL;
634 }
635
636 lacl->mapped_lun = mapped_lun;
637 lacl->se_lun_nacl = nacl;
638
639 return lacl;
640 }
641
642 int core_dev_add_initiator_node_lun_acl(
643 struct se_portal_group *tpg,
644 struct se_lun_acl *lacl,
645 struct se_lun *lun,
646 bool lun_access_ro)
647 {
648 struct se_node_acl *nacl = lacl->se_lun_nacl;
649 /*
650 * rcu_dereference_raw protected by se_lun->lun_group symlink
651 * reference to se_device->dev_group.
652 */
653 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
654
655 if (!nacl)
656 return -EINVAL;
657
658 if (lun->lun_access_ro)
659 lun_access_ro = true;
660
661 lacl->se_lun = lun;
662
663 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
664 lun_access_ro, nacl, tpg) < 0)
665 return -EINVAL;
666
667 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
668 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
669 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
670 lun_access_ro ? "RO" : "RW",
671 nacl->initiatorname);
672 /*
673 * Check to see if there are any existing persistent reservation APTPL
674 * pre-registrations that need to be enabled for this LUN ACL..
675 */
676 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
677 lacl->mapped_lun);
678 return 0;
679 }
680
681 int core_dev_del_initiator_node_lun_acl(
682 struct se_lun *lun,
683 struct se_lun_acl *lacl)
684 {
685 struct se_portal_group *tpg = lun->lun_tpg;
686 struct se_node_acl *nacl;
687 struct se_dev_entry *deve;
688
689 nacl = lacl->se_lun_nacl;
690 if (!nacl)
691 return -EINVAL;
692
693 mutex_lock(&nacl->lun_entry_mutex);
694 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
695 if (deve)
696 core_disable_device_list_for_node(lun, deve, nacl, tpg);
697 mutex_unlock(&nacl->lun_entry_mutex);
698
699 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
700 " InitiatorNode: %s Mapped LUN: %llu\n",
701 tpg->se_tpg_tfo->get_fabric_name(),
702 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
703 nacl->initiatorname, lacl->mapped_lun);
704
705 return 0;
706 }
707
708 void core_dev_free_initiator_node_lun_acl(
709 struct se_portal_group *tpg,
710 struct se_lun_acl *lacl)
711 {
712 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
713 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
714 tpg->se_tpg_tfo->tpg_get_tag(tpg),
715 tpg->se_tpg_tfo->get_fabric_name(),
716 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
717
718 kfree(lacl);
719 }
720
721 static void scsi_dump_inquiry(struct se_device *dev)
722 {
723 struct t10_wwn *wwn = &dev->t10_wwn;
724 char buf[17];
725 int i, device_type;
726 /*
727 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
728 */
729 for (i = 0; i < 8; i++)
730 if (wwn->vendor[i] >= 0x20)
731 buf[i] = wwn->vendor[i];
732 else
733 buf[i] = ' ';
734 buf[i] = '\0';
735 pr_debug(" Vendor: %s\n", buf);
736
737 for (i = 0; i < 16; i++)
738 if (wwn->model[i] >= 0x20)
739 buf[i] = wwn->model[i];
740 else
741 buf[i] = ' ';
742 buf[i] = '\0';
743 pr_debug(" Model: %s\n", buf);
744
745 for (i = 0; i < 4; i++)
746 if (wwn->revision[i] >= 0x20)
747 buf[i] = wwn->revision[i];
748 else
749 buf[i] = ' ';
750 buf[i] = '\0';
751 pr_debug(" Revision: %s\n", buf);
752
753 device_type = dev->transport->get_device_type(dev);
754 pr_debug(" Type: %s ", scsi_device_type(device_type));
755 }
756
757 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
758 {
759 struct se_device *dev;
760 struct se_lun *xcopy_lun;
761
762 dev = hba->backend->ops->alloc_device(hba, name);
763 if (!dev)
764 return NULL;
765
766 dev->se_hba = hba;
767 dev->transport = hba->backend->ops;
768 dev->prot_length = sizeof(struct t10_pi_tuple);
769 dev->hba_index = hba->hba_index;
770
771 INIT_LIST_HEAD(&dev->dev_sep_list);
772 INIT_LIST_HEAD(&dev->dev_tmr_list);
773 INIT_LIST_HEAD(&dev->delayed_cmd_list);
774 INIT_LIST_HEAD(&dev->state_list);
775 INIT_LIST_HEAD(&dev->qf_cmd_list);
776 spin_lock_init(&dev->execute_task_lock);
777 spin_lock_init(&dev->delayed_cmd_lock);
778 spin_lock_init(&dev->dev_reservation_lock);
779 spin_lock_init(&dev->se_port_lock);
780 spin_lock_init(&dev->se_tmr_lock);
781 spin_lock_init(&dev->qf_cmd_lock);
782 sema_init(&dev->caw_sem, 1);
783 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
784 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
785 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
786 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
787 spin_lock_init(&dev->t10_pr.registration_lock);
788 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
789 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
790 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
791 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
792 spin_lock_init(&dev->t10_alua.lba_map_lock);
793
794 dev->t10_wwn.t10_dev = dev;
795 dev->t10_alua.t10_dev = dev;
796
797 dev->dev_attrib.da_dev = dev;
798 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
799 dev->dev_attrib.emulate_dpo = 1;
800 dev->dev_attrib.emulate_fua_write = 1;
801 dev->dev_attrib.emulate_fua_read = 1;
802 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
803 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
804 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
805 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
806 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
807 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
808 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
809 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
810 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
811 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
812 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
813 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
814 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
815 dev->dev_attrib.max_unmap_block_desc_count =
816 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
817 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
818 dev->dev_attrib.unmap_granularity_alignment =
819 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
820 dev->dev_attrib.unmap_zeroes_data =
821 DA_UNMAP_ZEROES_DATA_DEFAULT;
822 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
823
824 xcopy_lun = &dev->xcopy_lun;
825 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
826 init_completion(&xcopy_lun->lun_ref_comp);
827 init_completion(&xcopy_lun->lun_shutdown_comp);
828 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
829 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
830 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
831 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
832
833 return dev;
834 }
835
836 /*
837 * Check if the underlying struct block_device request_queue supports
838 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
839 * in ATA and we need to set TPE=1
840 */
841 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
842 struct request_queue *q)
843 {
844 int block_size = queue_logical_block_size(q);
845
846 if (!blk_queue_discard(q))
847 return false;
848
849 attrib->max_unmap_lba_count =
850 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
851 /*
852 * Currently hardcoded to 1 in Linux/SCSI code..
853 */
854 attrib->max_unmap_block_desc_count = 1;
855 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
856 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
857 block_size;
858 attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
859 return true;
860 }
861 EXPORT_SYMBOL(target_configure_unmap_from_queue);
862
863 /*
864 * Convert from blocksize advertised to the initiator to the 512 byte
865 * units unconditionally used by the Linux block layer.
866 */
867 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
868 {
869 switch (dev->dev_attrib.block_size) {
870 case 4096:
871 return lb << 3;
872 case 2048:
873 return lb << 2;
874 case 1024:
875 return lb << 1;
876 default:
877 return lb;
878 }
879 }
880 EXPORT_SYMBOL(target_to_linux_sector);
881
882 /**
883 * target_find_device - find a se_device by its dev_index
884 * @id: dev_index
885 * @do_depend: true if caller needs target_depend_item to be done
886 *
887 * If do_depend is true, the caller must do a target_undepend_item
888 * when finished using the device.
889 *
890 * If do_depend is false, the caller must be called in a configfs
891 * callback or during removal.
892 */
893 struct se_device *target_find_device(int id, bool do_depend)
894 {
895 struct se_device *dev;
896
897 mutex_lock(&device_mutex);
898 dev = idr_find(&devices_idr, id);
899 if (dev && do_depend && target_depend_item(&dev->dev_group.cg_item))
900 dev = NULL;
901 mutex_unlock(&device_mutex);
902 return dev;
903 }
904 EXPORT_SYMBOL(target_find_device);
905
906 struct devices_idr_iter {
907 int (*fn)(struct se_device *dev, void *data);
908 void *data;
909 };
910
911 static int target_devices_idr_iter(int id, void *p, void *data)
912 {
913 struct devices_idr_iter *iter = data;
914 struct se_device *dev = p;
915
916 /*
917 * We add the device early to the idr, so it can be used
918 * by backend modules during configuration. We do not want
919 * to allow other callers to access partially setup devices,
920 * so we skip them here.
921 */
922 if (!(dev->dev_flags & DF_CONFIGURED))
923 return 0;
924
925 return iter->fn(dev, iter->data);
926 }
927
928 /**
929 * target_for_each_device - iterate over configured devices
930 * @fn: iterator function
931 * @data: pointer to data that will be passed to fn
932 *
933 * fn must return 0 to continue looping over devices. non-zero will break
934 * from the loop and return that value to the caller.
935 */
936 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
937 void *data)
938 {
939 struct devices_idr_iter iter;
940 int ret;
941
942 iter.fn = fn;
943 iter.data = data;
944
945 mutex_lock(&device_mutex);
946 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
947 mutex_unlock(&device_mutex);
948 return ret;
949 }
950
951 int target_configure_device(struct se_device *dev)
952 {
953 struct se_hba *hba = dev->se_hba;
954 int ret, id;
955
956 if (dev->dev_flags & DF_CONFIGURED) {
957 pr_err("se_dev->se_dev_ptr already set for storage"
958 " object\n");
959 return -EEXIST;
960 }
961
962 /*
963 * Add early so modules like tcmu can use during its
964 * configuration.
965 */
966 mutex_lock(&device_mutex);
967 /*
968 * Use cyclic to try and avoid collisions with devices
969 * that were recently removed.
970 */
971 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
972 mutex_unlock(&device_mutex);
973 if (id < 0) {
974 ret = -ENOMEM;
975 goto out;
976 }
977 dev->dev_index = id;
978
979 ret = dev->transport->configure_device(dev);
980 if (ret)
981 goto out_free_index;
982 /*
983 * XXX: there is not much point to have two different values here..
984 */
985 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
986 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
987
988 /*
989 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
990 */
991 dev->dev_attrib.hw_max_sectors =
992 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
993 dev->dev_attrib.hw_block_size);
994 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
995
996 dev->creation_time = get_jiffies_64();
997
998 ret = core_setup_alua(dev);
999 if (ret)
1000 goto out_destroy_device;
1001
1002 /*
1003 * Startup the struct se_device processing thread
1004 */
1005 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1006 dev->transport->name);
1007 if (!dev->tmr_wq) {
1008 pr_err("Unable to create tmr workqueue for %s\n",
1009 dev->transport->name);
1010 ret = -ENOMEM;
1011 goto out_free_alua;
1012 }
1013
1014 /*
1015 * Setup work_queue for QUEUE_FULL
1016 */
1017 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1018
1019 /*
1020 * Preload the initial INQUIRY const values if we are doing
1021 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1022 * passthrough because this is being provided by the backend LLD.
1023 */
1024 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1025 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1026 strncpy(&dev->t10_wwn.model[0],
1027 dev->transport->inquiry_prod, 16);
1028 strncpy(&dev->t10_wwn.revision[0],
1029 dev->transport->inquiry_rev, 4);
1030 }
1031
1032 scsi_dump_inquiry(dev);
1033
1034 spin_lock(&hba->device_lock);
1035 hba->dev_count++;
1036 spin_unlock(&hba->device_lock);
1037
1038 dev->dev_flags |= DF_CONFIGURED;
1039
1040 return 0;
1041
1042 out_free_alua:
1043 core_alua_free_lu_gp_mem(dev);
1044 out_destroy_device:
1045 dev->transport->destroy_device(dev);
1046 out_free_index:
1047 mutex_lock(&device_mutex);
1048 idr_remove(&devices_idr, dev->dev_index);
1049 mutex_unlock(&device_mutex);
1050 out:
1051 se_release_vpd_for_dev(dev);
1052 return ret;
1053 }
1054
1055 void target_free_device(struct se_device *dev)
1056 {
1057 struct se_hba *hba = dev->se_hba;
1058
1059 WARN_ON(!list_empty(&dev->dev_sep_list));
1060
1061 if (dev->dev_flags & DF_CONFIGURED) {
1062 destroy_workqueue(dev->tmr_wq);
1063
1064 dev->transport->destroy_device(dev);
1065
1066 mutex_lock(&device_mutex);
1067 idr_remove(&devices_idr, dev->dev_index);
1068 mutex_unlock(&device_mutex);
1069
1070 spin_lock(&hba->device_lock);
1071 hba->dev_count--;
1072 spin_unlock(&hba->device_lock);
1073 }
1074
1075 core_alua_free_lu_gp_mem(dev);
1076 core_alua_set_lba_map(dev, NULL, 0, 0);
1077 core_scsi3_free_all_registrations(dev);
1078 se_release_vpd_for_dev(dev);
1079
1080 if (dev->transport->free_prot)
1081 dev->transport->free_prot(dev);
1082
1083 dev->transport->free_device(dev);
1084 }
1085
1086 int core_dev_setup_virtual_lun0(void)
1087 {
1088 struct se_hba *hba;
1089 struct se_device *dev;
1090 char buf[] = "rd_pages=8,rd_nullio=1";
1091 int ret;
1092
1093 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1094 if (IS_ERR(hba))
1095 return PTR_ERR(hba);
1096
1097 dev = target_alloc_device(hba, "virt_lun0");
1098 if (!dev) {
1099 ret = -ENOMEM;
1100 goto out_free_hba;
1101 }
1102
1103 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1104
1105 ret = target_configure_device(dev);
1106 if (ret)
1107 goto out_free_se_dev;
1108
1109 lun0_hba = hba;
1110 g_lun0_dev = dev;
1111 return 0;
1112
1113 out_free_se_dev:
1114 target_free_device(dev);
1115 out_free_hba:
1116 core_delete_hba(hba);
1117 return ret;
1118 }
1119
1120
1121 void core_dev_release_virtual_lun0(void)
1122 {
1123 struct se_hba *hba = lun0_hba;
1124
1125 if (!hba)
1126 return;
1127
1128 if (g_lun0_dev)
1129 target_free_device(g_lun0_dev);
1130 core_delete_hba(hba);
1131 }
1132
1133 /*
1134 * Common CDB parsing for kernel and user passthrough.
1135 */
1136 sense_reason_t
1137 passthrough_parse_cdb(struct se_cmd *cmd,
1138 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1139 {
1140 unsigned char *cdb = cmd->t_task_cdb;
1141 struct se_device *dev = cmd->se_dev;
1142 unsigned int size;
1143
1144 /*
1145 * Clear a lun set in the cdb if the initiator talking to use spoke
1146 * and old standards version, as we can't assume the underlying device
1147 * won't choke up on it.
1148 */
1149 switch (cdb[0]) {
1150 case READ_10: /* SBC - RDProtect */
1151 case READ_12: /* SBC - RDProtect */
1152 case READ_16: /* SBC - RDProtect */
1153 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1154 case VERIFY: /* SBC - VRProtect */
1155 case VERIFY_16: /* SBC - VRProtect */
1156 case WRITE_VERIFY: /* SBC - VRProtect */
1157 case WRITE_VERIFY_12: /* SBC - VRProtect */
1158 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1159 break;
1160 default:
1161 cdb[1] &= 0x1f; /* clear logical unit number */
1162 break;
1163 }
1164
1165 /*
1166 * For REPORT LUNS we always need to emulate the response, for everything
1167 * else, pass it up.
1168 */
1169 if (cdb[0] == REPORT_LUNS) {
1170 cmd->execute_cmd = spc_emulate_report_luns;
1171 return TCM_NO_SENSE;
1172 }
1173
1174 /*
1175 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1176 * emulate the response, since tcmu does not have the information
1177 * required to process these commands.
1178 */
1179 if (!(dev->transport->transport_flags &
1180 TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1181 if (cdb[0] == PERSISTENT_RESERVE_IN) {
1182 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1183 size = get_unaligned_be16(&cdb[7]);
1184 return target_cmd_size_check(cmd, size);
1185 }
1186 if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1187 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1188 size = get_unaligned_be32(&cdb[5]);
1189 return target_cmd_size_check(cmd, size);
1190 }
1191
1192 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1193 cmd->execute_cmd = target_scsi2_reservation_release;
1194 if (cdb[0] == RELEASE_10)
1195 size = get_unaligned_be16(&cdb[7]);
1196 else
1197 size = cmd->data_length;
1198 return target_cmd_size_check(cmd, size);
1199 }
1200 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1201 cmd->execute_cmd = target_scsi2_reservation_reserve;
1202 if (cdb[0] == RESERVE_10)
1203 size = get_unaligned_be16(&cdb[7]);
1204 else
1205 size = cmd->data_length;
1206 return target_cmd_size_check(cmd, size);
1207 }
1208 }
1209
1210 /* Set DATA_CDB flag for ops that should have it */
1211 switch (cdb[0]) {
1212 case READ_6:
1213 case READ_10:
1214 case READ_12:
1215 case READ_16:
1216 case WRITE_6:
1217 case WRITE_10:
1218 case WRITE_12:
1219 case WRITE_16:
1220 case WRITE_VERIFY:
1221 case WRITE_VERIFY_12:
1222 case WRITE_VERIFY_16:
1223 case COMPARE_AND_WRITE:
1224 case XDWRITEREAD_10:
1225 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1226 break;
1227 case VARIABLE_LENGTH_CMD:
1228 switch (get_unaligned_be16(&cdb[8])) {
1229 case READ_32:
1230 case WRITE_32:
1231 case WRITE_VERIFY_32:
1232 case XDWRITEREAD_32:
1233 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1234 break;
1235 }
1236 }
1237
1238 cmd->execute_cmd = exec_cmd;
1239
1240 return TCM_NO_SENSE;
1241 }
1242 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux with added FPC-III support