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
transport_lookup_cmd_lun(struct se_cmd * se_cmd,u64 unpacked_lun)59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
60 {
61 struct se_lun *se_lun = NULL;
62 struct se_session *se_sess = se_cmd->se_sess;
63 struct se_node_acl *nacl = se_sess->se_node_acl;
64 struct se_dev_entry *deve;
65 sense_reason_t ret = TCM_NO_SENSE;
66
67 rcu_read_lock();
68 deve = target_nacl_find_deve(nacl, unpacked_lun);
69 if (deve) {
70 atomic_long_inc(&deve->total_cmds);
71
72 if (se_cmd->data_direction == DMA_TO_DEVICE)
73 atomic_long_add(se_cmd->data_length,
74 &deve->write_bytes);
75 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
76 atomic_long_add(se_cmd->data_length,
77 &deve->read_bytes);
78
79 se_lun = rcu_dereference(deve->se_lun);
80
81 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
82 se_lun = NULL;
83 goto out_unlock;
84 }
85
86 se_cmd->se_lun = rcu_dereference(deve->se_lun);
87 se_cmd->pr_res_key = deve->pr_res_key;
88 se_cmd->orig_fe_lun = unpacked_lun;
89 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
90 se_cmd->lun_ref_active = true;
91
92 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
93 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
94 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
95 " Access for 0x%08llx\n",
96 se_cmd->se_tfo->get_fabric_name(),
97 unpacked_lun);
98 rcu_read_unlock();
99 ret = TCM_WRITE_PROTECTED;
100 goto ref_dev;
101 }
102 }
103 out_unlock:
104 rcu_read_unlock();
105
106 if (!se_lun) {
107 /*
108 * Use the se_portal_group->tpg_virt_lun0 to allow for
109 * REPORT_LUNS, et al to be returned when no active
110 * MappedLUN=0 exists for this Initiator Port.
111 */
112 if (unpacked_lun != 0) {
113 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
114 " Access for 0x%08llx\n",
115 se_cmd->se_tfo->get_fabric_name(),
116 unpacked_lun);
117 return TCM_NON_EXISTENT_LUN;
118 }
119
120 se_lun = se_sess->se_tpg->tpg_virt_lun0;
121 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
122 se_cmd->orig_fe_lun = 0;
123 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
124
125 percpu_ref_get(&se_lun->lun_ref);
126 se_cmd->lun_ref_active = true;
127
128 /*
129 * Force WRITE PROTECT for virtual LUN 0
130 */
131 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
132 (se_cmd->data_direction != DMA_NONE)) {
133 ret = TCM_WRITE_PROTECTED;
134 goto ref_dev;
135 }
136 }
137 /*
138 * RCU reference protected by percpu se_lun->lun_ref taken above that
139 * must drop to zero (including initial reference) before this se_lun
140 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
141 * target_core_fabric_configfs.c:target_fabric_port_release
142 */
143 ref_dev:
144 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
145 atomic_long_inc(&se_cmd->se_dev->num_cmds);
146
147 if (se_cmd->data_direction == DMA_TO_DEVICE)
148 atomic_long_add(se_cmd->data_length,
149 &se_cmd->se_dev->write_bytes);
150 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
151 atomic_long_add(se_cmd->data_length,
152 &se_cmd->se_dev->read_bytes);
153
154 return ret;
155 }
156 EXPORT_SYMBOL(transport_lookup_cmd_lun);
157
transport_lookup_tmr_lun(struct se_cmd * se_cmd,u64 unpacked_lun)158 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
159 {
160 struct se_dev_entry *deve;
161 struct se_lun *se_lun = NULL;
162 struct se_session *se_sess = se_cmd->se_sess;
163 struct se_node_acl *nacl = se_sess->se_node_acl;
164 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
165 unsigned long flags;
166
167 rcu_read_lock();
168 deve = target_nacl_find_deve(nacl, unpacked_lun);
169 if (deve) {
170 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
171 se_cmd->se_lun = rcu_dereference(deve->se_lun);
172 se_lun = rcu_dereference(deve->se_lun);
173 se_cmd->pr_res_key = deve->pr_res_key;
174 se_cmd->orig_fe_lun = unpacked_lun;
175 }
176 rcu_read_unlock();
177
178 if (!se_lun) {
179 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
180 " Access for 0x%08llx\n",
181 se_cmd->se_tfo->get_fabric_name(),
182 unpacked_lun);
183 return -ENODEV;
184 }
185 /*
186 * XXX: Add percpu se_lun->lun_ref reference count for TMR
187 */
188 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
189 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
190
191 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
192 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
193 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
194
195 return 0;
196 }
197 EXPORT_SYMBOL(transport_lookup_tmr_lun);
198
target_lun_is_rdonly(struct se_cmd * cmd)199 bool target_lun_is_rdonly(struct se_cmd *cmd)
200 {
201 struct se_session *se_sess = cmd->se_sess;
202 struct se_dev_entry *deve;
203 bool ret;
204
205 rcu_read_lock();
206 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
207 ret = (deve && deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
208 rcu_read_unlock();
209
210 return ret;
211 }
212 EXPORT_SYMBOL(target_lun_is_rdonly);
213
214 /*
215 * This function is called from core_scsi3_emulate_pro_register_and_move()
216 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
217 * when a matching rtpi is found.
218 */
core_get_se_deve_from_rtpi(struct se_node_acl * nacl,u16 rtpi)219 struct se_dev_entry *core_get_se_deve_from_rtpi(
220 struct se_node_acl *nacl,
221 u16 rtpi)
222 {
223 struct se_dev_entry *deve;
224 struct se_lun *lun;
225 struct se_portal_group *tpg = nacl->se_tpg;
226
227 rcu_read_lock();
228 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
229 lun = rcu_dereference(deve->se_lun);
230 if (!lun) {
231 pr_err("%s device entries device pointer is"
232 " NULL, but Initiator has access.\n",
233 tpg->se_tpg_tfo->get_fabric_name());
234 continue;
235 }
236 if (lun->lun_rtpi != rtpi)
237 continue;
238
239 kref_get(&deve->pr_kref);
240 rcu_read_unlock();
241
242 return deve;
243 }
244 rcu_read_unlock();
245
246 return NULL;
247 }
248
core_free_device_list_for_node(struct se_node_acl * nacl,struct se_portal_group * tpg)249 void core_free_device_list_for_node(
250 struct se_node_acl *nacl,
251 struct se_portal_group *tpg)
252 {
253 struct se_dev_entry *deve;
254
255 mutex_lock(&nacl->lun_entry_mutex);
256 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
257 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
258 lockdep_is_held(&nacl->lun_entry_mutex));
259 core_disable_device_list_for_node(lun, deve, nacl, tpg);
260 }
261 mutex_unlock(&nacl->lun_entry_mutex);
262 }
263
core_update_device_list_access(u64 mapped_lun,u32 lun_access,struct se_node_acl * nacl)264 void core_update_device_list_access(
265 u64 mapped_lun,
266 u32 lun_access,
267 struct se_node_acl *nacl)
268 {
269 struct se_dev_entry *deve;
270
271 mutex_lock(&nacl->lun_entry_mutex);
272 deve = target_nacl_find_deve(nacl, mapped_lun);
273 if (deve) {
274 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
275 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
276 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
277 } else {
278 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
279 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
280 }
281 }
282 mutex_unlock(&nacl->lun_entry_mutex);
283 }
284
285 /*
286 * Called with rcu_read_lock or nacl->device_list_lock held.
287 */
target_nacl_find_deve(struct se_node_acl * nacl,u64 mapped_lun)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
target_pr_kref_release(struct kref * kref)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
target_luns_data_has_changed(struct se_node_acl * nacl,struct se_dev_entry * new,bool skip_new)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
core_enable_device_list_for_node(struct se_lun * lun,struct se_lun_acl * lun_acl,u64 mapped_lun,u32 lun_access,struct se_node_acl * nacl,struct se_portal_group * tpg)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 u32 lun_access,
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 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
349 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
350 else
351 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
352
353 new->creation_time = get_jiffies_64();
354 new->attach_count++;
355
356 mutex_lock(&nacl->lun_entry_mutex);
357 orig = target_nacl_find_deve(nacl, mapped_lun);
358 if (orig && orig->se_lun) {
359 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
360 lockdep_is_held(&nacl->lun_entry_mutex));
361
362 if (orig_lun != lun) {
363 pr_err("Existing orig->se_lun doesn't match new lun"
364 " for dynamic -> explicit NodeACL conversion:"
365 " %s\n", nacl->initiatorname);
366 mutex_unlock(&nacl->lun_entry_mutex);
367 kfree(new);
368 return -EINVAL;
369 }
370 if (orig->se_lun_acl != NULL) {
371 pr_warn_ratelimited("Detected existing explicit"
372 " se_lun_acl->se_lun_group reference for %s"
373 " mapped_lun: %llu, failing\n",
374 nacl->initiatorname, mapped_lun);
375 mutex_unlock(&nacl->lun_entry_mutex);
376 kfree(new);
377 return -EINVAL;
378 }
379
380 rcu_assign_pointer(new->se_lun, lun);
381 rcu_assign_pointer(new->se_lun_acl, lun_acl);
382 hlist_del_rcu(&orig->link);
383 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
384 mutex_unlock(&nacl->lun_entry_mutex);
385
386 spin_lock(&lun->lun_deve_lock);
387 list_del(&orig->lun_link);
388 list_add_tail(&new->lun_link, &lun->lun_deve_list);
389 spin_unlock(&lun->lun_deve_lock);
390
391 kref_put(&orig->pr_kref, target_pr_kref_release);
392 wait_for_completion(&orig->pr_comp);
393
394 target_luns_data_has_changed(nacl, new, true);
395 kfree_rcu(orig, rcu_head);
396 return 0;
397 }
398
399 rcu_assign_pointer(new->se_lun, lun);
400 rcu_assign_pointer(new->se_lun_acl, lun_acl);
401 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
402 mutex_unlock(&nacl->lun_entry_mutex);
403
404 spin_lock(&lun->lun_deve_lock);
405 list_add_tail(&new->lun_link, &lun->lun_deve_list);
406 spin_unlock(&lun->lun_deve_lock);
407
408 target_luns_data_has_changed(nacl, new, true);
409 return 0;
410 }
411
412 /*
413 * Called with se_node_acl->lun_entry_mutex held.
414 */
core_disable_device_list_for_node(struct se_lun * lun,struct se_dev_entry * orig,struct se_node_acl * nacl,struct se_portal_group * tpg)415 void core_disable_device_list_for_node(
416 struct se_lun *lun,
417 struct se_dev_entry *orig,
418 struct se_node_acl *nacl,
419 struct se_portal_group *tpg)
420 {
421 /*
422 * rcu_dereference_raw protected by se_lun->lun_group symlink
423 * reference to se_device->dev_group.
424 */
425 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
426 /*
427 * If the MappedLUN entry is being disabled, the entry in
428 * lun->lun_deve_list must be removed now before clearing the
429 * struct se_dev_entry pointers below as logic in
430 * core_alua_do_transition_tg_pt() depends on these being present.
431 *
432 * deve->se_lun_acl will be NULL for demo-mode created LUNs
433 * that have not been explicitly converted to MappedLUNs ->
434 * struct se_lun_acl, but we remove deve->lun_link from
435 * lun->lun_deve_list. This also means that active UAs and
436 * NodeACL context specific PR metadata for demo-mode
437 * MappedLUN *deve will be released below..
438 */
439 spin_lock(&lun->lun_deve_lock);
440 list_del(&orig->lun_link);
441 spin_unlock(&lun->lun_deve_lock);
442 /*
443 * Disable struct se_dev_entry LUN ACL mapping
444 */
445 core_scsi3_ua_release_all(orig);
446
447 hlist_del_rcu(&orig->link);
448 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
449 orig->lun_flags = 0;
450 orig->creation_time = 0;
451 orig->attach_count--;
452 /*
453 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
454 * or REGISTER_AND_MOVE PR operation to complete.
455 */
456 kref_put(&orig->pr_kref, target_pr_kref_release);
457 wait_for_completion(&orig->pr_comp);
458
459 rcu_assign_pointer(orig->se_lun, NULL);
460 rcu_assign_pointer(orig->se_lun_acl, NULL);
461
462 kfree_rcu(orig, rcu_head);
463
464 core_scsi3_free_pr_reg_from_nacl(dev, nacl);
465 target_luns_data_has_changed(nacl, NULL, false);
466 }
467
468 /* core_clear_lun_from_tpg():
469 *
470 *
471 */
core_clear_lun_from_tpg(struct se_lun * lun,struct se_portal_group * tpg)472 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
473 {
474 struct se_node_acl *nacl;
475 struct se_dev_entry *deve;
476
477 mutex_lock(&tpg->acl_node_mutex);
478 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
479
480 mutex_lock(&nacl->lun_entry_mutex);
481 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
482 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
483 lockdep_is_held(&nacl->lun_entry_mutex));
484
485 if (lun != tmp_lun)
486 continue;
487
488 core_disable_device_list_for_node(lun, deve, nacl, tpg);
489 }
490 mutex_unlock(&nacl->lun_entry_mutex);
491 }
492 mutex_unlock(&tpg->acl_node_mutex);
493 }
494
core_alloc_rtpi(struct se_lun * lun,struct se_device * dev)495 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
496 {
497 struct se_lun *tmp;
498
499 spin_lock(&dev->se_port_lock);
500 if (dev->export_count == 0x0000ffff) {
501 pr_warn("Reached dev->dev_port_count =="
502 " 0x0000ffff\n");
503 spin_unlock(&dev->se_port_lock);
504 return -ENOSPC;
505 }
506 again:
507 /*
508 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
509 * Here is the table from spc4r17 section 7.7.3.8.
510 *
511 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
512 *
513 * Code Description
514 * 0h Reserved
515 * 1h Relative port 1, historically known as port A
516 * 2h Relative port 2, historically known as port B
517 * 3h to FFFFh Relative port 3 through 65 535
518 */
519 lun->lun_rtpi = dev->dev_rpti_counter++;
520 if (!lun->lun_rtpi)
521 goto again;
522
523 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
524 /*
525 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
526 * for 16-bit wrap..
527 */
528 if (lun->lun_rtpi == tmp->lun_rtpi)
529 goto again;
530 }
531 spin_unlock(&dev->se_port_lock);
532
533 return 0;
534 }
535
se_release_vpd_for_dev(struct se_device * dev)536 static void se_release_vpd_for_dev(struct se_device *dev)
537 {
538 struct t10_vpd *vpd, *vpd_tmp;
539
540 spin_lock(&dev->t10_wwn.t10_vpd_lock);
541 list_for_each_entry_safe(vpd, vpd_tmp,
542 &dev->t10_wwn.t10_vpd_list, vpd_list) {
543 list_del(&vpd->vpd_list);
544 kfree(vpd);
545 }
546 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
547 }
548
se_dev_align_max_sectors(u32 max_sectors,u32 block_size)549 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
550 {
551 u32 aligned_max_sectors;
552 u32 alignment;
553 /*
554 * Limit max_sectors to a PAGE_SIZE aligned value for modern
555 * transport_allocate_data_tasks() operation.
556 */
557 alignment = max(1ul, PAGE_SIZE / block_size);
558 aligned_max_sectors = rounddown(max_sectors, alignment);
559
560 if (max_sectors != aligned_max_sectors)
561 pr_info("Rounding down aligned max_sectors from %u to %u\n",
562 max_sectors, aligned_max_sectors);
563
564 return aligned_max_sectors;
565 }
566
core_dev_add_lun(struct se_portal_group * tpg,struct se_device * dev,struct se_lun * lun)567 int core_dev_add_lun(
568 struct se_portal_group *tpg,
569 struct se_device *dev,
570 struct se_lun *lun)
571 {
572 int rc;
573
574 rc = core_tpg_add_lun(tpg, lun,
575 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
576 if (rc < 0)
577 return rc;
578
579 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
580 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
581 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
582 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
583 /*
584 * Update LUN maps for dynamically added initiators when
585 * generate_node_acl is enabled.
586 */
587 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
588 struct se_node_acl *acl;
589
590 mutex_lock(&tpg->acl_node_mutex);
591 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
592 if (acl->dynamic_node_acl &&
593 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
594 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
595 core_tpg_add_node_to_devs(acl, tpg, lun);
596 }
597 }
598 mutex_unlock(&tpg->acl_node_mutex);
599 }
600
601 return 0;
602 }
603
604 /* core_dev_del_lun():
605 *
606 *
607 */
core_dev_del_lun(struct se_portal_group * tpg,struct se_lun * lun)608 void core_dev_del_lun(
609 struct se_portal_group *tpg,
610 struct se_lun *lun)
611 {
612 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
613 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
614 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
615 tpg->se_tpg_tfo->get_fabric_name());
616
617 core_tpg_remove_lun(tpg, lun);
618 }
619
core_dev_init_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_node_acl * nacl,u64 mapped_lun,int * ret)620 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
621 struct se_portal_group *tpg,
622 struct se_node_acl *nacl,
623 u64 mapped_lun,
624 int *ret)
625 {
626 struct se_lun_acl *lacl;
627
628 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
629 pr_err("%s InitiatorName exceeds maximum size.\n",
630 tpg->se_tpg_tfo->get_fabric_name());
631 *ret = -EOVERFLOW;
632 return NULL;
633 }
634 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
635 if (!lacl) {
636 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
637 *ret = -ENOMEM;
638 return NULL;
639 }
640
641 lacl->mapped_lun = mapped_lun;
642 lacl->se_lun_nacl = nacl;
643
644 return lacl;
645 }
646
core_dev_add_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_lun_acl * lacl,struct se_lun * lun,u32 lun_access)647 int core_dev_add_initiator_node_lun_acl(
648 struct se_portal_group *tpg,
649 struct se_lun_acl *lacl,
650 struct se_lun *lun,
651 u32 lun_access)
652 {
653 struct se_node_acl *nacl = lacl->se_lun_nacl;
654 /*
655 * rcu_dereference_raw protected by se_lun->lun_group symlink
656 * reference to se_device->dev_group.
657 */
658 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
659
660 if (!nacl)
661 return -EINVAL;
662
663 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
664 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
665 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
666
667 lacl->se_lun = lun;
668
669 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
670 lun_access, nacl, tpg) < 0)
671 return -EINVAL;
672
673 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
674 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
675 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
676 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
677 nacl->initiatorname);
678 /*
679 * Check to see if there are any existing persistent reservation APTPL
680 * pre-registrations that need to be enabled for this LUN ACL..
681 */
682 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
683 lacl->mapped_lun);
684 return 0;
685 }
686
core_dev_del_initiator_node_lun_acl(struct se_lun * lun,struct se_lun_acl * lacl)687 int core_dev_del_initiator_node_lun_acl(
688 struct se_lun *lun,
689 struct se_lun_acl *lacl)
690 {
691 struct se_portal_group *tpg = lun->lun_tpg;
692 struct se_node_acl *nacl;
693 struct se_dev_entry *deve;
694
695 nacl = lacl->se_lun_nacl;
696 if (!nacl)
697 return -EINVAL;
698
699 mutex_lock(&nacl->lun_entry_mutex);
700 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
701 if (deve)
702 core_disable_device_list_for_node(lun, deve, nacl, tpg);
703 mutex_unlock(&nacl->lun_entry_mutex);
704
705 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
706 " InitiatorNode: %s Mapped LUN: %llu\n",
707 tpg->se_tpg_tfo->get_fabric_name(),
708 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
709 nacl->initiatorname, lacl->mapped_lun);
710
711 return 0;
712 }
713
core_dev_free_initiator_node_lun_acl(struct se_portal_group * tpg,struct se_lun_acl * lacl)714 void core_dev_free_initiator_node_lun_acl(
715 struct se_portal_group *tpg,
716 struct se_lun_acl *lacl)
717 {
718 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
719 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
720 tpg->se_tpg_tfo->tpg_get_tag(tpg),
721 tpg->se_tpg_tfo->get_fabric_name(),
722 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
723
724 kfree(lacl);
725 }
726
scsi_dump_inquiry(struct se_device * dev)727 static void scsi_dump_inquiry(struct se_device *dev)
728 {
729 struct t10_wwn *wwn = &dev->t10_wwn;
730 char buf[17];
731 int i, device_type;
732 /*
733 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
734 */
735 for (i = 0; i < 8; i++)
736 if (wwn->vendor[i] >= 0x20)
737 buf[i] = wwn->vendor[i];
738 else
739 buf[i] = ' ';
740 buf[i] = '\0';
741 pr_debug(" Vendor: %s\n", buf);
742
743 for (i = 0; i < 16; i++)
744 if (wwn->model[i] >= 0x20)
745 buf[i] = wwn->model[i];
746 else
747 buf[i] = ' ';
748 buf[i] = '\0';
749 pr_debug(" Model: %s\n", buf);
750
751 for (i = 0; i < 4; i++)
752 if (wwn->revision[i] >= 0x20)
753 buf[i] = wwn->revision[i];
754 else
755 buf[i] = ' ';
756 buf[i] = '\0';
757 pr_debug(" Revision: %s\n", buf);
758
759 device_type = dev->transport->get_device_type(dev);
760 pr_debug(" Type: %s ", scsi_device_type(device_type));
761 }
762
target_alloc_device(struct se_hba * hba,const char * name)763 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
764 {
765 struct se_device *dev;
766 struct se_lun *xcopy_lun;
767
768 dev = hba->backend->ops->alloc_device(hba, name);
769 if (!dev)
770 return NULL;
771
772 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
773 dev->se_hba = hba;
774 dev->transport = hba->backend->ops;
775 dev->prot_length = sizeof(struct t10_pi_tuple);
776 dev->hba_index = hba->hba_index;
777
778 INIT_LIST_HEAD(&dev->dev_list);
779 INIT_LIST_HEAD(&dev->dev_sep_list);
780 INIT_LIST_HEAD(&dev->dev_tmr_list);
781 INIT_LIST_HEAD(&dev->delayed_cmd_list);
782 INIT_LIST_HEAD(&dev->state_list);
783 INIT_LIST_HEAD(&dev->qf_cmd_list);
784 INIT_LIST_HEAD(&dev->g_dev_node);
785 spin_lock_init(&dev->execute_task_lock);
786 spin_lock_init(&dev->delayed_cmd_lock);
787 spin_lock_init(&dev->dev_reservation_lock);
788 spin_lock_init(&dev->se_port_lock);
789 spin_lock_init(&dev->se_tmr_lock);
790 spin_lock_init(&dev->qf_cmd_lock);
791 sema_init(&dev->caw_sem, 1);
792 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
793 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
794 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
795 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
796 spin_lock_init(&dev->t10_pr.registration_lock);
797 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
798 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
799 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
800 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
801 spin_lock_init(&dev->t10_alua.lba_map_lock);
802
803 INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
804
805 dev->t10_wwn.t10_dev = dev;
806 dev->t10_alua.t10_dev = dev;
807
808 dev->dev_attrib.da_dev = dev;
809 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
810 dev->dev_attrib.emulate_dpo = 1;
811 dev->dev_attrib.emulate_fua_write = 1;
812 dev->dev_attrib.emulate_fua_read = 1;
813 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
814 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
815 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
816 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
817 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
818 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
819 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
820 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
821 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
822 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
823 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
824 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
825 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
826 dev->dev_attrib.max_unmap_block_desc_count =
827 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
828 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
829 dev->dev_attrib.unmap_granularity_alignment =
830 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
831 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
832
833 xcopy_lun = &dev->xcopy_lun;
834 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
835 init_completion(&xcopy_lun->lun_ref_comp);
836 init_completion(&xcopy_lun->lun_shutdown_comp);
837 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
838 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
839 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
840 xcopy_lun->lun_tpg = &xcopy_pt_tpg;
841
842 return dev;
843 }
844
845 /*
846 * Check if the underlying struct block_device request_queue supports
847 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
848 * in ATA and we need to set TPE=1
849 */
target_configure_unmap_from_queue(struct se_dev_attrib * attrib,struct request_queue * q)850 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
851 struct request_queue *q)
852 {
853 int block_size = queue_logical_block_size(q);
854
855 if (!blk_queue_discard(q))
856 return false;
857
858 attrib->max_unmap_lba_count =
859 q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
860 /*
861 * Currently hardcoded to 1 in Linux/SCSI code..
862 */
863 attrib->max_unmap_block_desc_count = 1;
864 attrib->unmap_granularity = q->limits.discard_granularity / block_size;
865 attrib->unmap_granularity_alignment = q->limits.discard_alignment /
866 block_size;
867 return true;
868 }
869 EXPORT_SYMBOL(target_configure_unmap_from_queue);
870
871 /*
872 * Convert from blocksize advertised to the initiator to the 512 byte
873 * units unconditionally used by the Linux block layer.
874 */
target_to_linux_sector(struct se_device * dev,sector_t lb)875 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
876 {
877 switch (dev->dev_attrib.block_size) {
878 case 4096:
879 return lb << 3;
880 case 2048:
881 return lb << 2;
882 case 1024:
883 return lb << 1;
884 default:
885 return lb;
886 }
887 }
888 EXPORT_SYMBOL(target_to_linux_sector);
889
target_configure_device(struct se_device * dev)890 int target_configure_device(struct se_device *dev)
891 {
892 struct se_hba *hba = dev->se_hba;
893 int ret;
894
895 if (dev->dev_flags & DF_CONFIGURED) {
896 pr_err("se_dev->se_dev_ptr already set for storage"
897 " object\n");
898 return -EEXIST;
899 }
900
901 ret = dev->transport->configure_device(dev);
902 if (ret)
903 goto out;
904 /*
905 * XXX: there is not much point to have two different values here..
906 */
907 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
908 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
909
910 /*
911 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
912 */
913 dev->dev_attrib.hw_max_sectors =
914 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
915 dev->dev_attrib.hw_block_size);
916 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
917
918 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
919 dev->creation_time = get_jiffies_64();
920
921 ret = core_setup_alua(dev);
922 if (ret)
923 goto out;
924
925 /*
926 * Startup the struct se_device processing thread
927 */
928 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
929 dev->transport->name);
930 if (!dev->tmr_wq) {
931 pr_err("Unable to create tmr workqueue for %s\n",
932 dev->transport->name);
933 ret = -ENOMEM;
934 goto out_free_alua;
935 }
936
937 /*
938 * Setup work_queue for QUEUE_FULL
939 */
940 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
941
942 /*
943 * Preload the initial INQUIRY const values if we are doing
944 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
945 * passthrough because this is being provided by the backend LLD.
946 */
947 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
948 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
949 strncpy(&dev->t10_wwn.model[0],
950 dev->transport->inquiry_prod, 16);
951 strncpy(&dev->t10_wwn.revision[0],
952 dev->transport->inquiry_rev, 4);
953 }
954
955 scsi_dump_inquiry(dev);
956
957 spin_lock(&hba->device_lock);
958 hba->dev_count++;
959 spin_unlock(&hba->device_lock);
960
961 mutex_lock(&g_device_mutex);
962 list_add_tail(&dev->g_dev_node, &g_device_list);
963 mutex_unlock(&g_device_mutex);
964
965 dev->dev_flags |= DF_CONFIGURED;
966
967 return 0;
968
969 out_free_alua:
970 core_alua_free_lu_gp_mem(dev);
971 out:
972 se_release_vpd_for_dev(dev);
973 return ret;
974 }
975
target_free_device(struct se_device * dev)976 void target_free_device(struct se_device *dev)
977 {
978 struct se_hba *hba = dev->se_hba;
979
980 WARN_ON(!list_empty(&dev->dev_sep_list));
981
982 if (dev->dev_flags & DF_CONFIGURED) {
983 destroy_workqueue(dev->tmr_wq);
984
985 mutex_lock(&g_device_mutex);
986 list_del(&dev->g_dev_node);
987 mutex_unlock(&g_device_mutex);
988
989 spin_lock(&hba->device_lock);
990 hba->dev_count--;
991 spin_unlock(&hba->device_lock);
992 }
993
994 core_alua_free_lu_gp_mem(dev);
995 core_alua_set_lba_map(dev, NULL, 0, 0);
996 core_scsi3_free_all_registrations(dev);
997 se_release_vpd_for_dev(dev);
998
999 if (dev->transport->free_prot)
1000 dev->transport->free_prot(dev);
1001
1002 dev->transport->free_device(dev);
1003 }
1004
core_dev_setup_virtual_lun0(void)1005 int core_dev_setup_virtual_lun0(void)
1006 {
1007 struct se_hba *hba;
1008 struct se_device *dev;
1009 char buf[] = "rd_pages=8,rd_nullio=1";
1010 int ret;
1011
1012 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1013 if (IS_ERR(hba))
1014 return PTR_ERR(hba);
1015
1016 dev = target_alloc_device(hba, "virt_lun0");
1017 if (!dev) {
1018 ret = -ENOMEM;
1019 goto out_free_hba;
1020 }
1021
1022 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1023
1024 ret = target_configure_device(dev);
1025 if (ret)
1026 goto out_free_se_dev;
1027
1028 lun0_hba = hba;
1029 g_lun0_dev = dev;
1030 return 0;
1031
1032 out_free_se_dev:
1033 target_free_device(dev);
1034 out_free_hba:
1035 core_delete_hba(hba);
1036 return ret;
1037 }
1038
1039
core_dev_release_virtual_lun0(void)1040 void core_dev_release_virtual_lun0(void)
1041 {
1042 struct se_hba *hba = lun0_hba;
1043
1044 if (!hba)
1045 return;
1046
1047 if (g_lun0_dev)
1048 target_free_device(g_lun0_dev);
1049 core_delete_hba(hba);
1050 }
1051
1052 /*
1053 * Common CDB parsing for kernel and user passthrough.
1054 */
1055 sense_reason_t
passthrough_parse_cdb(struct se_cmd * cmd,sense_reason_t (* exec_cmd)(struct se_cmd * cmd))1056 passthrough_parse_cdb(struct se_cmd *cmd,
1057 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1058 {
1059 unsigned char *cdb = cmd->t_task_cdb;
1060
1061 /*
1062 * For REPORT LUNS we always need to emulate the response, for everything
1063 * else, pass it up.
1064 */
1065 if (cdb[0] == REPORT_LUNS) {
1066 cmd->execute_cmd = spc_emulate_report_luns;
1067 return TCM_NO_SENSE;
1068 }
1069
1070 /* Set DATA_CDB flag for ops that should have it */
1071 switch (cdb[0]) {
1072 case READ_6:
1073 case READ_10:
1074 case READ_12:
1075 case READ_16:
1076 case WRITE_6:
1077 case WRITE_10:
1078 case WRITE_12:
1079 case WRITE_16:
1080 case WRITE_VERIFY:
1081 case WRITE_VERIFY_12:
1082 case 0x8e: /* WRITE_VERIFY_16 */
1083 case COMPARE_AND_WRITE:
1084 case XDWRITEREAD_10:
1085 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1086 break;
1087 case VARIABLE_LENGTH_CMD:
1088 switch (get_unaligned_be16(&cdb[8])) {
1089 case READ_32:
1090 case WRITE_32:
1091 case 0x0c: /* WRITE_VERIFY_32 */
1092 case XDWRITEREAD_32:
1093 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1094 break;
1095 }
1096 }
1097
1098 cmd->execute_cmd = exec_cmd;
1099
1100 return TCM_NO_SENSE;
1101 }
1102 EXPORT_SYMBOL(passthrough_parse_cdb);
1103