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target: simplify backend driver registration
[deliverable/linux.git] / drivers / target / target_core_device.c
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.h>
40 #include <scsi/scsi_device.h>
41
42 #include <target/target_core_base.h>
43 #include <target/target_core_backend.h>
44 #include <target/target_core_fabric.h>
45
46 #include "target_core_internal.h"
47 #include "target_core_alua.h"
48 #include "target_core_pr.h"
49 #include "target_core_ua.h"
50
51 DEFINE_MUTEX(g_device_mutex);
52 LIST_HEAD(g_device_list);
53
54 static struct se_hba *lun0_hba;
55 /* not static, needed by tpg.c */
56 struct se_device *g_lun0_dev;
57
58 sense_reason_t
59 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 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_device *dev;
65 struct se_dev_entry *deve;
66
67 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
68 return TCM_NON_EXISTENT_LUN;
69
70 rcu_read_lock();
71 deve = target_nacl_find_deve(nacl, unpacked_lun);
72 if (deve) {
73 atomic_long_inc(&deve->total_cmds);
74
75 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
76 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
77 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
78 " Access for 0x%08x\n",
79 se_cmd->se_tfo->get_fabric_name(),
80 unpacked_lun);
81 rcu_read_unlock();
82 return TCM_WRITE_PROTECTED;
83 }
84
85 if (se_cmd->data_direction == DMA_TO_DEVICE)
86 atomic_long_add(se_cmd->data_length,
87 &deve->write_bytes);
88 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
89 atomic_long_add(se_cmd->data_length,
90 &deve->read_bytes);
91
92 se_lun = rcu_dereference(deve->se_lun);
93 se_cmd->se_lun = rcu_dereference(deve->se_lun);
94 se_cmd->pr_res_key = deve->pr_res_key;
95 se_cmd->orig_fe_lun = unpacked_lun;
96 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
97
98 percpu_ref_get(&se_lun->lun_ref);
99 se_cmd->lun_ref_active = true;
100 }
101 rcu_read_unlock();
102
103 if (!se_lun) {
104 /*
105 * Use the se_portal_group->tpg_virt_lun0 to allow for
106 * REPORT_LUNS, et al to be returned when no active
107 * MappedLUN=0 exists for this Initiator Port.
108 */
109 if (unpacked_lun != 0) {
110 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
111 " Access for 0x%08x\n",
112 se_cmd->se_tfo->get_fabric_name(),
113 unpacked_lun);
114 return TCM_NON_EXISTENT_LUN;
115 }
116 /*
117 * Force WRITE PROTECT for virtual LUN 0
118 */
119 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
120 (se_cmd->data_direction != DMA_NONE))
121 return TCM_WRITE_PROTECTED;
122
123 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
124 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
125 se_cmd->orig_fe_lun = 0;
126 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
127
128 percpu_ref_get(&se_lun->lun_ref);
129 se_cmd->lun_ref_active = true;
130 }
131
132 /* Directly associate cmd with se_dev */
133 se_cmd->se_dev = se_lun->lun_se_dev;
134
135 dev = se_lun->lun_se_dev;
136 atomic_long_inc(&dev->num_cmds);
137 if (se_cmd->data_direction == DMA_TO_DEVICE)
138 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
139 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
140 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
141
142 return 0;
143 }
144 EXPORT_SYMBOL(transport_lookup_cmd_lun);
145
146 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
147 {
148 struct se_dev_entry *deve;
149 struct se_lun *se_lun = NULL;
150 struct se_session *se_sess = se_cmd->se_sess;
151 struct se_node_acl *nacl = se_sess->se_node_acl;
152 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
153 unsigned long flags;
154
155 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
156 return -ENODEV;
157
158 rcu_read_lock();
159 deve = target_nacl_find_deve(nacl, unpacked_lun);
160 if (deve) {
161 se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
162 se_cmd->se_lun = rcu_dereference(deve->se_lun);
163 se_lun = rcu_dereference(deve->se_lun);
164 se_cmd->pr_res_key = deve->pr_res_key;
165 se_cmd->orig_fe_lun = unpacked_lun;
166 }
167 rcu_read_unlock();
168
169 if (!se_lun) {
170 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
171 " Access for 0x%08x\n",
172 se_cmd->se_tfo->get_fabric_name(),
173 unpacked_lun);
174 return -ENODEV;
175 }
176
177 /* Directly associate cmd with se_dev */
178 se_cmd->se_dev = se_lun->lun_se_dev;
179 se_tmr->tmr_dev = se_lun->lun_se_dev;
180
181 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
182 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
183 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
184
185 return 0;
186 }
187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
188
189 bool target_lun_is_rdonly(struct se_cmd *cmd)
190 {
191 struct se_session *se_sess = cmd->se_sess;
192 struct se_dev_entry *deve;
193 bool ret;
194
195 if (cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY)
196 return true;
197
198 rcu_read_lock();
199 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
200 ret = (deve && deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
201 rcu_read_unlock();
202
203 return ret;
204 }
205 EXPORT_SYMBOL(target_lun_is_rdonly);
206
207 /*
208 * This function is called from core_scsi3_emulate_pro_register_and_move()
209 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
210 * when a matching rtpi is found.
211 */
212 struct se_dev_entry *core_get_se_deve_from_rtpi(
213 struct se_node_acl *nacl,
214 u16 rtpi)
215 {
216 struct se_dev_entry *deve;
217 struct se_lun *lun;
218 struct se_portal_group *tpg = nacl->se_tpg;
219
220 rcu_read_lock();
221 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
222 lun = rcu_dereference(deve->se_lun);
223 if (!lun) {
224 pr_err("%s device entries device pointer is"
225 " NULL, but Initiator has access.\n",
226 tpg->se_tpg_tfo->get_fabric_name());
227 continue;
228 }
229 if (lun->lun_rtpi != rtpi)
230 continue;
231
232 kref_get(&deve->pr_kref);
233 rcu_read_unlock();
234
235 return deve;
236 }
237 rcu_read_unlock();
238
239 return NULL;
240 }
241
242 void core_free_device_list_for_node(
243 struct se_node_acl *nacl,
244 struct se_portal_group *tpg)
245 {
246 struct se_dev_entry *deve;
247
248 mutex_lock(&nacl->lun_entry_mutex);
249 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
250 struct se_lun *lun = rcu_dereference_check(deve->se_lun,
251 lockdep_is_held(&nacl->lun_entry_mutex));
252 core_disable_device_list_for_node(lun, deve, nacl, tpg);
253 }
254 mutex_unlock(&nacl->lun_entry_mutex);
255 }
256
257 void core_update_device_list_access(
258 u32 mapped_lun,
259 u32 lun_access,
260 struct se_node_acl *nacl)
261 {
262 struct se_dev_entry *deve;
263
264 mutex_lock(&nacl->lun_entry_mutex);
265 deve = target_nacl_find_deve(nacl, mapped_lun);
266 if (deve) {
267 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
268 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
269 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
270 } else {
271 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
272 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
273 }
274 }
275 mutex_unlock(&nacl->lun_entry_mutex);
276 }
277
278 /*
279 * Called with rcu_read_lock or nacl->device_list_lock held.
280 */
281 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u32 mapped_lun)
282 {
283 struct se_dev_entry *deve;
284
285 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
286 if (deve->mapped_lun == mapped_lun)
287 return deve;
288
289 return NULL;
290 }
291 EXPORT_SYMBOL(target_nacl_find_deve);
292
293 void target_pr_kref_release(struct kref *kref)
294 {
295 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
296 pr_kref);
297 complete(&deve->pr_comp);
298 }
299
300 /* core_enable_device_list_for_node():
301 *
302 *
303 */
304 int core_enable_device_list_for_node(
305 struct se_lun *lun,
306 struct se_lun_acl *lun_acl,
307 u32 mapped_lun,
308 u32 lun_access,
309 struct se_node_acl *nacl,
310 struct se_portal_group *tpg)
311 {
312 struct se_port *port = lun->lun_sep;
313 struct se_dev_entry *orig, *new;
314
315 new = kzalloc(sizeof(*new), GFP_KERNEL);
316 if (!new) {
317 pr_err("Unable to allocate se_dev_entry memory\n");
318 return -ENOMEM;
319 }
320
321 atomic_set(&new->ua_count, 0);
322 spin_lock_init(&new->ua_lock);
323 INIT_LIST_HEAD(&new->alua_port_list);
324 INIT_LIST_HEAD(&new->ua_list);
325
326 new->mapped_lun = mapped_lun;
327 kref_init(&new->pr_kref);
328 init_completion(&new->pr_comp);
329
330 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
331 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
332 else
333 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
334
335 new->creation_time = get_jiffies_64();
336 new->attach_count++;
337
338 mutex_lock(&nacl->lun_entry_mutex);
339 orig = target_nacl_find_deve(nacl, mapped_lun);
340 if (orig && orig->se_lun) {
341 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
342 lockdep_is_held(&nacl->lun_entry_mutex));
343
344 if (orig_lun != lun) {
345 pr_err("Existing orig->se_lun doesn't match new lun"
346 " for dynamic -> explicit NodeACL conversion:"
347 " %s\n", nacl->initiatorname);
348 mutex_unlock(&nacl->lun_entry_mutex);
349 kfree(new);
350 return -EINVAL;
351 }
352 BUG_ON(orig->se_lun_acl != NULL);
353
354 rcu_assign_pointer(new->se_lun, lun);
355 rcu_assign_pointer(new->se_lun_acl, lun_acl);
356 hlist_del_rcu(&orig->link);
357 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
358 mutex_unlock(&nacl->lun_entry_mutex);
359
360 spin_lock_bh(&port->sep_alua_lock);
361 list_del(&orig->alua_port_list);
362 list_add_tail(&new->alua_port_list, &port->sep_alua_list);
363 spin_unlock_bh(&port->sep_alua_lock);
364
365 kref_put(&orig->pr_kref, target_pr_kref_release);
366 wait_for_completion(&orig->pr_comp);
367
368 kfree_rcu(orig, rcu_head);
369 return 0;
370 }
371
372 rcu_assign_pointer(new->se_lun, lun);
373 rcu_assign_pointer(new->se_lun_acl, lun_acl);
374 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
375 mutex_unlock(&nacl->lun_entry_mutex);
376
377 spin_lock_bh(&port->sep_alua_lock);
378 list_add_tail(&new->alua_port_list, &port->sep_alua_list);
379 spin_unlock_bh(&port->sep_alua_lock);
380
381 return 0;
382 }
383
384 /*
385 * Called with se_node_acl->lun_entry_mutex held.
386 */
387 void core_disable_device_list_for_node(
388 struct se_lun *lun,
389 struct se_dev_entry *orig,
390 struct se_node_acl *nacl,
391 struct se_portal_group *tpg)
392 {
393 struct se_port *port = lun->lun_sep;
394 /*
395 * If the MappedLUN entry is being disabled, the entry in
396 * port->sep_alua_list must be removed now before clearing the
397 * struct se_dev_entry pointers below as logic in
398 * core_alua_do_transition_tg_pt() depends on these being present.
399 *
400 * deve->se_lun_acl will be NULL for demo-mode created LUNs
401 * that have not been explicitly converted to MappedLUNs ->
402 * struct se_lun_acl, but we remove deve->alua_port_list from
403 * port->sep_alua_list. This also means that active UAs and
404 * NodeACL context specific PR metadata for demo-mode
405 * MappedLUN *deve will be released below..
406 */
407 spin_lock_bh(&port->sep_alua_lock);
408 list_del(&orig->alua_port_list);
409 spin_unlock_bh(&port->sep_alua_lock);
410 /*
411 * Disable struct se_dev_entry LUN ACL mapping
412 */
413 core_scsi3_ua_release_all(orig);
414
415 hlist_del_rcu(&orig->link);
416 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
417 rcu_assign_pointer(orig->se_lun, NULL);
418 rcu_assign_pointer(orig->se_lun_acl, NULL);
419 orig->lun_flags = 0;
420 orig->creation_time = 0;
421 orig->attach_count--;
422 /*
423 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
424 * or REGISTER_AND_MOVE PR operation to complete.
425 */
426 kref_put(&orig->pr_kref, target_pr_kref_release);
427 wait_for_completion(&orig->pr_comp);
428
429 kfree_rcu(orig, rcu_head);
430
431 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
432 }
433
434 /* core_clear_lun_from_tpg():
435 *
436 *
437 */
438 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
439 {
440 struct se_node_acl *nacl;
441 struct se_dev_entry *deve;
442
443 mutex_lock(&tpg->acl_node_mutex);
444 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
445
446 mutex_lock(&nacl->lun_entry_mutex);
447 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
448 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
449 lockdep_is_held(&nacl->lun_entry_mutex));
450
451 if (lun != tmp_lun)
452 continue;
453
454 core_disable_device_list_for_node(lun, deve, nacl, tpg);
455 }
456 mutex_unlock(&nacl->lun_entry_mutex);
457 }
458 mutex_unlock(&tpg->acl_node_mutex);
459 }
460
461 static struct se_port *core_alloc_port(struct se_device *dev)
462 {
463 struct se_port *port, *port_tmp;
464
465 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
466 if (!port) {
467 pr_err("Unable to allocate struct se_port\n");
468 return ERR_PTR(-ENOMEM);
469 }
470 INIT_LIST_HEAD(&port->sep_alua_list);
471 INIT_LIST_HEAD(&port->sep_list);
472 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
473 spin_lock_init(&port->sep_alua_lock);
474 mutex_init(&port->sep_tg_pt_md_mutex);
475
476 spin_lock(&dev->se_port_lock);
477 if (dev->dev_port_count == 0x0000ffff) {
478 pr_warn("Reached dev->dev_port_count =="
479 " 0x0000ffff\n");
480 spin_unlock(&dev->se_port_lock);
481 return ERR_PTR(-ENOSPC);
482 }
483 again:
484 /*
485 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
486 * Here is the table from spc4r17 section 7.7.3.8.
487 *
488 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
489 *
490 * Code Description
491 * 0h Reserved
492 * 1h Relative port 1, historically known as port A
493 * 2h Relative port 2, historically known as port B
494 * 3h to FFFFh Relative port 3 through 65 535
495 */
496 port->sep_rtpi = dev->dev_rpti_counter++;
497 if (!port->sep_rtpi)
498 goto again;
499
500 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
501 /*
502 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
503 * for 16-bit wrap..
504 */
505 if (port->sep_rtpi == port_tmp->sep_rtpi)
506 goto again;
507 }
508 spin_unlock(&dev->se_port_lock);
509
510 return port;
511 }
512
513 static void core_export_port(
514 struct se_device *dev,
515 struct se_portal_group *tpg,
516 struct se_port *port,
517 struct se_lun *lun)
518 {
519 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
520
521 spin_lock(&dev->se_port_lock);
522 spin_lock(&lun->lun_sep_lock);
523 port->sep_tpg = tpg;
524 port->sep_lun = lun;
525 lun->lun_sep = port;
526 spin_unlock(&lun->lun_sep_lock);
527
528 list_add_tail(&port->sep_list, &dev->dev_sep_list);
529 spin_unlock(&dev->se_port_lock);
530
531 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
532 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
533 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
534 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
535 pr_err("Unable to allocate t10_alua_tg_pt"
536 "_gp_member_t\n");
537 return;
538 }
539 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
540 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
541 dev->t10_alua.default_tg_pt_gp);
542 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
543 pr_debug("%s/%s: Adding to default ALUA Target Port"
544 " Group: alua/default_tg_pt_gp\n",
545 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
546 }
547
548 dev->dev_port_count++;
549 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
550 }
551
552 /*
553 * Called with struct se_device->se_port_lock spinlock held.
554 */
555 static void core_release_port(struct se_device *dev, struct se_port *port)
556 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
557 {
558 /*
559 * Wait for any port reference for PR ALL_TG_PT=1 operation
560 * to complete in __core_scsi3_alloc_registration()
561 */
562 spin_unlock(&dev->se_port_lock);
563 if (atomic_read(&port->sep_tg_pt_ref_cnt))
564 cpu_relax();
565 spin_lock(&dev->se_port_lock);
566
567 core_alua_free_tg_pt_gp_mem(port);
568
569 list_del(&port->sep_list);
570 dev->dev_port_count--;
571 kfree(port);
572 }
573
574 int core_dev_export(
575 struct se_device *dev,
576 struct se_portal_group *tpg,
577 struct se_lun *lun)
578 {
579 struct se_hba *hba = dev->se_hba;
580 struct se_port *port;
581
582 port = core_alloc_port(dev);
583 if (IS_ERR(port))
584 return PTR_ERR(port);
585
586 lun->lun_index = dev->dev_index;
587 lun->lun_se_dev = dev;
588 lun->lun_rtpi = port->sep_rtpi;
589
590 spin_lock(&hba->device_lock);
591 dev->export_count++;
592 spin_unlock(&hba->device_lock);
593
594 core_export_port(dev, tpg, port, lun);
595 return 0;
596 }
597
598 void core_dev_unexport(
599 struct se_device *dev,
600 struct se_portal_group *tpg,
601 struct se_lun *lun)
602 {
603 struct se_hba *hba = dev->se_hba;
604 struct se_port *port = lun->lun_sep;
605
606 spin_lock(&lun->lun_sep_lock);
607 if (lun->lun_se_dev == NULL) {
608 spin_unlock(&lun->lun_sep_lock);
609 return;
610 }
611 spin_unlock(&lun->lun_sep_lock);
612
613 spin_lock(&dev->se_port_lock);
614 core_release_port(dev, port);
615 spin_unlock(&dev->se_port_lock);
616
617 spin_lock(&hba->device_lock);
618 dev->export_count--;
619 spin_unlock(&hba->device_lock);
620
621 lun->lun_sep = NULL;
622 lun->lun_se_dev = NULL;
623 }
624
625 static void se_release_vpd_for_dev(struct se_device *dev)
626 {
627 struct t10_vpd *vpd, *vpd_tmp;
628
629 spin_lock(&dev->t10_wwn.t10_vpd_lock);
630 list_for_each_entry_safe(vpd, vpd_tmp,
631 &dev->t10_wwn.t10_vpd_list, vpd_list) {
632 list_del(&vpd->vpd_list);
633 kfree(vpd);
634 }
635 spin_unlock(&dev->t10_wwn.t10_vpd_lock);
636 }
637
638 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
639 {
640 u32 aligned_max_sectors;
641 u32 alignment;
642 /*
643 * Limit max_sectors to a PAGE_SIZE aligned value for modern
644 * transport_allocate_data_tasks() operation.
645 */
646 alignment = max(1ul, PAGE_SIZE / block_size);
647 aligned_max_sectors = rounddown(max_sectors, alignment);
648
649 if (max_sectors != aligned_max_sectors)
650 pr_info("Rounding down aligned max_sectors from %u to %u\n",
651 max_sectors, aligned_max_sectors);
652
653 return aligned_max_sectors;
654 }
655
656 bool se_dev_check_wce(struct se_device *dev)
657 {
658 bool wce = false;
659
660 if (dev->transport->get_write_cache)
661 wce = dev->transport->get_write_cache(dev);
662 else if (dev->dev_attrib.emulate_write_cache > 0)
663 wce = true;
664
665 return wce;
666 }
667
668 int se_dev_set_max_unmap_lba_count(
669 struct se_device *dev,
670 u32 max_unmap_lba_count)
671 {
672 dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
673 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
674 dev, dev->dev_attrib.max_unmap_lba_count);
675 return 0;
676 }
677 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
678
679 int se_dev_set_max_unmap_block_desc_count(
680 struct se_device *dev,
681 u32 max_unmap_block_desc_count)
682 {
683 dev->dev_attrib.max_unmap_block_desc_count =
684 max_unmap_block_desc_count;
685 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
686 dev, dev->dev_attrib.max_unmap_block_desc_count);
687 return 0;
688 }
689 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
690
691 int se_dev_set_unmap_granularity(
692 struct se_device *dev,
693 u32 unmap_granularity)
694 {
695 dev->dev_attrib.unmap_granularity = unmap_granularity;
696 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
697 dev, dev->dev_attrib.unmap_granularity);
698 return 0;
699 }
700 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
701
702 int se_dev_set_unmap_granularity_alignment(
703 struct se_device *dev,
704 u32 unmap_granularity_alignment)
705 {
706 dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
707 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
708 dev, dev->dev_attrib.unmap_granularity_alignment);
709 return 0;
710 }
711 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
712
713 int se_dev_set_max_write_same_len(
714 struct se_device *dev,
715 u32 max_write_same_len)
716 {
717 dev->dev_attrib.max_write_same_len = max_write_same_len;
718 pr_debug("dev[%p]: Set max_write_same_len: %u\n",
719 dev, dev->dev_attrib.max_write_same_len);
720 return 0;
721 }
722 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
723
724 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
725 {
726 const char *configname;
727
728 configname = config_item_name(&dev->dev_group.cg_item);
729 if (strlen(configname) >= 16) {
730 pr_warn("dev[%p]: Backstore name '%s' is too long for "
731 "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
732 configname);
733 }
734 snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
735 }
736
737 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
738 {
739 if (dev->export_count) {
740 pr_err("dev[%p]: Unable to change model alias"
741 " while export_count is %d\n",
742 dev, dev->export_count);
743 return -EINVAL;
744 }
745
746 if (flag != 0 && flag != 1) {
747 pr_err("Illegal value %d\n", flag);
748 return -EINVAL;
749 }
750
751 if (flag) {
752 dev_set_t10_wwn_model_alias(dev);
753 } else {
754 strncpy(&dev->t10_wwn.model[0],
755 dev->transport->inquiry_prod, 16);
756 }
757 dev->dev_attrib.emulate_model_alias = flag;
758
759 return 0;
760 }
761 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
762
763 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
764 {
765 printk_once(KERN_WARNING
766 "ignoring deprecated emulate_dpo attribute\n");
767 return 0;
768 }
769 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
770
771 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
772 {
773 if (flag != 0 && flag != 1) {
774 pr_err("Illegal value %d\n", flag);
775 return -EINVAL;
776 }
777 if (flag &&
778 dev->transport->get_write_cache) {
779 pr_warn("emulate_fua_write not supported for this device, ignoring\n");
780 return 0;
781 }
782 if (dev->export_count) {
783 pr_err("emulate_fua_write cannot be changed with active"
784 " exports: %d\n", dev->export_count);
785 return -EINVAL;
786 }
787 dev->dev_attrib.emulate_fua_write = flag;
788 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
789 dev, dev->dev_attrib.emulate_fua_write);
790 return 0;
791 }
792 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
793
794 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
795 {
796 printk_once(KERN_WARNING
797 "ignoring deprecated emulate_fua_read attribute\n");
798 return 0;
799 }
800 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
801
802 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
803 {
804 if (flag != 0 && flag != 1) {
805 pr_err("Illegal value %d\n", flag);
806 return -EINVAL;
807 }
808 if (flag &&
809 dev->transport->get_write_cache) {
810 pr_err("emulate_write_cache not supported for this device\n");
811 return -EINVAL;
812 }
813 if (dev->export_count) {
814 pr_err("emulate_write_cache cannot be changed with active"
815 " exports: %d\n", dev->export_count);
816 return -EINVAL;
817 }
818 dev->dev_attrib.emulate_write_cache = flag;
819 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
820 dev, dev->dev_attrib.emulate_write_cache);
821 return 0;
822 }
823 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
824
825 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
826 {
827 if ((flag != 0) && (flag != 1) && (flag != 2)) {
828 pr_err("Illegal value %d\n", flag);
829 return -EINVAL;
830 }
831
832 if (dev->export_count) {
833 pr_err("dev[%p]: Unable to change SE Device"
834 " UA_INTRLCK_CTRL while export_count is %d\n",
835 dev, dev->export_count);
836 return -EINVAL;
837 }
838 dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
839 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
840 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
841
842 return 0;
843 }
844 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
845
846 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
847 {
848 if ((flag != 0) && (flag != 1)) {
849 pr_err("Illegal value %d\n", flag);
850 return -EINVAL;
851 }
852
853 if (dev->export_count) {
854 pr_err("dev[%p]: Unable to change SE Device TAS while"
855 " export_count is %d\n",
856 dev, dev->export_count);
857 return -EINVAL;
858 }
859 dev->dev_attrib.emulate_tas = flag;
860 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
861 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
862
863 return 0;
864 }
865 EXPORT_SYMBOL(se_dev_set_emulate_tas);
866
867 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
868 {
869 if ((flag != 0) && (flag != 1)) {
870 pr_err("Illegal value %d\n", flag);
871 return -EINVAL;
872 }
873 /*
874 * We expect this value to be non-zero when generic Block Layer
875 * Discard supported is detected iblock_create_virtdevice().
876 */
877 if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
878 pr_err("Generic Block Discard not supported\n");
879 return -ENOSYS;
880 }
881
882 dev->dev_attrib.emulate_tpu = flag;
883 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
884 dev, flag);
885 return 0;
886 }
887 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
888
889 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
890 {
891 if ((flag != 0) && (flag != 1)) {
892 pr_err("Illegal value %d\n", flag);
893 return -EINVAL;
894 }
895 /*
896 * We expect this value to be non-zero when generic Block Layer
897 * Discard supported is detected iblock_create_virtdevice().
898 */
899 if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
900 pr_err("Generic Block Discard not supported\n");
901 return -ENOSYS;
902 }
903
904 dev->dev_attrib.emulate_tpws = flag;
905 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
906 dev, flag);
907 return 0;
908 }
909 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
910
911 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
912 {
913 if (flag != 0 && flag != 1) {
914 pr_err("Illegal value %d\n", flag);
915 return -EINVAL;
916 }
917 dev->dev_attrib.emulate_caw = flag;
918 pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
919 dev, flag);
920
921 return 0;
922 }
923 EXPORT_SYMBOL(se_dev_set_emulate_caw);
924
925 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
926 {
927 if (flag != 0 && flag != 1) {
928 pr_err("Illegal value %d\n", flag);
929 return -EINVAL;
930 }
931 dev->dev_attrib.emulate_3pc = flag;
932 pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
933 dev, flag);
934
935 return 0;
936 }
937 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
938
939 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
940 {
941 int rc, old_prot = dev->dev_attrib.pi_prot_type;
942
943 if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
944 pr_err("Illegal value %d for pi_prot_type\n", flag);
945 return -EINVAL;
946 }
947 if (flag == 2) {
948 pr_err("DIF TYPE2 protection currently not supported\n");
949 return -ENOSYS;
950 }
951 if (dev->dev_attrib.hw_pi_prot_type) {
952 pr_warn("DIF protection enabled on underlying hardware,"
953 " ignoring\n");
954 return 0;
955 }
956 if (!dev->transport->init_prot || !dev->transport->free_prot) {
957 /* 0 is only allowed value for non-supporting backends */
958 if (flag == 0)
959 return 0;
960
961 pr_err("DIF protection not supported by backend: %s\n",
962 dev->transport->name);
963 return -ENOSYS;
964 }
965 if (!(dev->dev_flags & DF_CONFIGURED)) {
966 pr_err("DIF protection requires device to be configured\n");
967 return -ENODEV;
968 }
969 if (dev->export_count) {
970 pr_err("dev[%p]: Unable to change SE Device PROT type while"
971 " export_count is %d\n", dev, dev->export_count);
972 return -EINVAL;
973 }
974
975 dev->dev_attrib.pi_prot_type = flag;
976
977 if (flag && !old_prot) {
978 rc = dev->transport->init_prot(dev);
979 if (rc) {
980 dev->dev_attrib.pi_prot_type = old_prot;
981 return rc;
982 }
983
984 } else if (!flag && old_prot) {
985 dev->transport->free_prot(dev);
986 }
987 pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
988
989 return 0;
990 }
991 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
992
993 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
994 {
995 int rc;
996
997 if (!flag)
998 return 0;
999
1000 if (flag != 1) {
1001 pr_err("Illegal value %d for pi_prot_format\n", flag);
1002 return -EINVAL;
1003 }
1004 if (!dev->transport->format_prot) {
1005 pr_err("DIF protection format not supported by backend %s\n",
1006 dev->transport->name);
1007 return -ENOSYS;
1008 }
1009 if (!(dev->dev_flags & DF_CONFIGURED)) {
1010 pr_err("DIF protection format requires device to be configured\n");
1011 return -ENODEV;
1012 }
1013 if (dev->export_count) {
1014 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1015 " export_count is %d\n", dev, dev->export_count);
1016 return -EINVAL;
1017 }
1018
1019 rc = dev->transport->format_prot(dev);
1020 if (rc)
1021 return rc;
1022
1023 pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1024
1025 return 0;
1026 }
1027 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1028
1029 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1030 {
1031 if ((flag != 0) && (flag != 1)) {
1032 pr_err("Illegal value %d\n", flag);
1033 return -EINVAL;
1034 }
1035 dev->dev_attrib.enforce_pr_isids = flag;
1036 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1037 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1038 return 0;
1039 }
1040 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1041
1042 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1043 {
1044 if ((flag != 0) && (flag != 1)) {
1045 printk(KERN_ERR "Illegal value %d\n", flag);
1046 return -EINVAL;
1047 }
1048 if (dev->export_count) {
1049 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1050 " export_count is %d\n", dev, dev->export_count);
1051 return -EINVAL;
1052 }
1053
1054 dev->dev_attrib.force_pr_aptpl = flag;
1055 pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1056 return 0;
1057 }
1058 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1059
1060 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1061 {
1062 if ((flag != 0) && (flag != 1)) {
1063 printk(KERN_ERR "Illegal value %d\n", flag);
1064 return -EINVAL;
1065 }
1066 dev->dev_attrib.is_nonrot = flag;
1067 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1068 dev, flag);
1069 return 0;
1070 }
1071 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1072
1073 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1074 {
1075 if (flag != 0) {
1076 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
1077 " reordering not implemented\n", dev);
1078 return -ENOSYS;
1079 }
1080 dev->dev_attrib.emulate_rest_reord = flag;
1081 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1082 return 0;
1083 }
1084 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1085
1086 /*
1087 * Note, this can only be called on unexported SE Device Object.
1088 */
1089 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1090 {
1091 if (dev->export_count) {
1092 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1093 " export_count is %d\n",
1094 dev, dev->export_count);
1095 return -EINVAL;
1096 }
1097 if (!queue_depth) {
1098 pr_err("dev[%p]: Illegal ZERO value for queue"
1099 "_depth\n", dev);
1100 return -EINVAL;
1101 }
1102
1103 if (queue_depth > dev->dev_attrib.queue_depth) {
1104 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1105 pr_err("dev[%p]: Passed queue_depth:"
1106 " %u exceeds TCM/SE_Device MAX"
1107 " TCQ: %u\n", dev, queue_depth,
1108 dev->dev_attrib.hw_queue_depth);
1109 return -EINVAL;
1110 }
1111 }
1112 dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1113 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1114 dev, queue_depth);
1115 return 0;
1116 }
1117 EXPORT_SYMBOL(se_dev_set_queue_depth);
1118
1119 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1120 {
1121 if (dev->export_count) {
1122 pr_err("dev[%p]: Unable to change SE Device"
1123 " optimal_sectors while export_count is %d\n",
1124 dev, dev->export_count);
1125 return -EINVAL;
1126 }
1127 if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1128 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1129 " greater than hw_max_sectors: %u\n", dev,
1130 optimal_sectors, dev->dev_attrib.hw_max_sectors);
1131 return -EINVAL;
1132 }
1133
1134 dev->dev_attrib.optimal_sectors = optimal_sectors;
1135 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1136 dev, optimal_sectors);
1137 return 0;
1138 }
1139 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1140
1141 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1142 {
1143 if (dev->export_count) {
1144 pr_err("dev[%p]: Unable to change SE Device block_size"
1145 " while export_count is %d\n",
1146 dev, dev->export_count);
1147 return -EINVAL;
1148 }
1149
1150 if ((block_size != 512) &&
1151 (block_size != 1024) &&
1152 (block_size != 2048) &&
1153 (block_size != 4096)) {
1154 pr_err("dev[%p]: Illegal value for block_device: %u"
1155 " for SE device, must be 512, 1024, 2048 or 4096\n",
1156 dev, block_size);
1157 return -EINVAL;
1158 }
1159
1160 dev->dev_attrib.block_size = block_size;
1161 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1162 dev, block_size);
1163
1164 if (dev->dev_attrib.max_bytes_per_io)
1165 dev->dev_attrib.hw_max_sectors =
1166 dev->dev_attrib.max_bytes_per_io / block_size;
1167
1168 return 0;
1169 }
1170 EXPORT_SYMBOL(se_dev_set_block_size);
1171
1172 int core_dev_add_lun(
1173 struct se_portal_group *tpg,
1174 struct se_device *dev,
1175 struct se_lun *lun)
1176 {
1177 int rc;
1178
1179 rc = core_tpg_add_lun(tpg, lun,
1180 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1181 if (rc < 0)
1182 return rc;
1183
1184 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1185 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1186 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1187 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1188 /*
1189 * Update LUN maps for dynamically added initiators when
1190 * generate_node_acl is enabled.
1191 */
1192 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1193 struct se_node_acl *acl;
1194
1195 mutex_lock(&tpg->acl_node_mutex);
1196 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1197 if (acl->dynamic_node_acl &&
1198 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1199 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1200 core_tpg_add_node_to_devs(acl, tpg, lun);
1201 }
1202 }
1203 mutex_unlock(&tpg->acl_node_mutex);
1204 }
1205
1206 return 0;
1207 }
1208
1209 /* core_dev_del_lun():
1210 *
1211 *
1212 */
1213 void core_dev_del_lun(
1214 struct se_portal_group *tpg,
1215 struct se_lun *lun)
1216 {
1217 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1218 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1219 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1220 tpg->se_tpg_tfo->get_fabric_name());
1221
1222 core_tpg_remove_lun(tpg, lun);
1223 }
1224
1225 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1226 struct se_portal_group *tpg,
1227 struct se_node_acl *nacl,
1228 u32 mapped_lun,
1229 int *ret)
1230 {
1231 struct se_lun_acl *lacl;
1232
1233 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1234 pr_err("%s InitiatorName exceeds maximum size.\n",
1235 tpg->se_tpg_tfo->get_fabric_name());
1236 *ret = -EOVERFLOW;
1237 return NULL;
1238 }
1239 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1240 if (!lacl) {
1241 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1242 *ret = -ENOMEM;
1243 return NULL;
1244 }
1245
1246 lacl->mapped_lun = mapped_lun;
1247 lacl->se_lun_nacl = nacl;
1248 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1249 nacl->initiatorname);
1250
1251 return lacl;
1252 }
1253
1254 int core_dev_add_initiator_node_lun_acl(
1255 struct se_portal_group *tpg,
1256 struct se_lun_acl *lacl,
1257 struct se_lun *lun,
1258 u32 lun_access)
1259 {
1260 struct se_node_acl *nacl = lacl->se_lun_nacl;
1261
1262 if (!nacl)
1263 return -EINVAL;
1264
1265 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1266 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1267 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1268
1269 lacl->se_lun = lun;
1270
1271 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1272 lun_access, nacl, tpg) < 0)
1273 return -EINVAL;
1274
1275 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1276 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1277 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
1278 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1279 lacl->initiatorname);
1280 /*
1281 * Check to see if there are any existing persistent reservation APTPL
1282 * pre-registrations that need to be enabled for this LUN ACL..
1283 */
1284 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1285 lacl->mapped_lun);
1286 return 0;
1287 }
1288
1289 int core_dev_del_initiator_node_lun_acl(
1290 struct se_portal_group *tpg,
1291 struct se_lun *lun,
1292 struct se_lun_acl *lacl)
1293 {
1294 struct se_node_acl *nacl;
1295 struct se_dev_entry *deve;
1296
1297 nacl = lacl->se_lun_nacl;
1298 if (!nacl)
1299 return -EINVAL;
1300
1301 mutex_lock(&nacl->lun_entry_mutex);
1302 deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
1303 if (deve)
1304 core_disable_device_list_for_node(lun, deve, nacl, tpg);
1305 mutex_unlock(&nacl->lun_entry_mutex);
1306
1307 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1308 " InitiatorNode: %s Mapped LUN: %u\n",
1309 tpg->se_tpg_tfo->get_fabric_name(),
1310 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1311 lacl->initiatorname, lacl->mapped_lun);
1312
1313 return 0;
1314 }
1315
1316 void core_dev_free_initiator_node_lun_acl(
1317 struct se_portal_group *tpg,
1318 struct se_lun_acl *lacl)
1319 {
1320 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1321 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1322 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1323 tpg->se_tpg_tfo->get_fabric_name(),
1324 lacl->initiatorname, lacl->mapped_lun);
1325
1326 kfree(lacl);
1327 }
1328
1329 static void scsi_dump_inquiry(struct se_device *dev)
1330 {
1331 struct t10_wwn *wwn = &dev->t10_wwn;
1332 char buf[17];
1333 int i, device_type;
1334 /*
1335 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1336 */
1337 for (i = 0; i < 8; i++)
1338 if (wwn->vendor[i] >= 0x20)
1339 buf[i] = wwn->vendor[i];
1340 else
1341 buf[i] = ' ';
1342 buf[i] = '\0';
1343 pr_debug(" Vendor: %s\n", buf);
1344
1345 for (i = 0; i < 16; i++)
1346 if (wwn->model[i] >= 0x20)
1347 buf[i] = wwn->model[i];
1348 else
1349 buf[i] = ' ';
1350 buf[i] = '\0';
1351 pr_debug(" Model: %s\n", buf);
1352
1353 for (i = 0; i < 4; i++)
1354 if (wwn->revision[i] >= 0x20)
1355 buf[i] = wwn->revision[i];
1356 else
1357 buf[i] = ' ';
1358 buf[i] = '\0';
1359 pr_debug(" Revision: %s\n", buf);
1360
1361 device_type = dev->transport->get_device_type(dev);
1362 pr_debug(" Type: %s ", scsi_device_type(device_type));
1363 }
1364
1365 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1366 {
1367 struct se_device *dev;
1368 struct se_lun *xcopy_lun;
1369
1370 dev = hba->backend->ops->alloc_device(hba, name);
1371 if (!dev)
1372 return NULL;
1373
1374 dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1375 dev->se_hba = hba;
1376 dev->transport = hba->backend->ops;
1377 dev->prot_length = sizeof(struct se_dif_v1_tuple);
1378
1379 INIT_LIST_HEAD(&dev->dev_list);
1380 INIT_LIST_HEAD(&dev->dev_sep_list);
1381 INIT_LIST_HEAD(&dev->dev_tmr_list);
1382 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1383 INIT_LIST_HEAD(&dev->state_list);
1384 INIT_LIST_HEAD(&dev->qf_cmd_list);
1385 INIT_LIST_HEAD(&dev->g_dev_node);
1386 spin_lock_init(&dev->execute_task_lock);
1387 spin_lock_init(&dev->delayed_cmd_lock);
1388 spin_lock_init(&dev->dev_reservation_lock);
1389 spin_lock_init(&dev->se_port_lock);
1390 spin_lock_init(&dev->se_tmr_lock);
1391 spin_lock_init(&dev->qf_cmd_lock);
1392 sema_init(&dev->caw_sem, 1);
1393 atomic_set(&dev->dev_ordered_id, 0);
1394 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1395 spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1396 INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1397 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1398 spin_lock_init(&dev->t10_pr.registration_lock);
1399 spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1400 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1401 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1402 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1403 spin_lock_init(&dev->t10_alua.lba_map_lock);
1404
1405 dev->t10_wwn.t10_dev = dev;
1406 dev->t10_alua.t10_dev = dev;
1407
1408 dev->dev_attrib.da_dev = dev;
1409 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1410 dev->dev_attrib.emulate_dpo = 1;
1411 dev->dev_attrib.emulate_fua_write = 1;
1412 dev->dev_attrib.emulate_fua_read = 1;
1413 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1414 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1415 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1416 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1417 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1418 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1419 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1420 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1421 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1422 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1423 dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1424 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1425 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1426 dev->dev_attrib.max_unmap_block_desc_count =
1427 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1428 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1429 dev->dev_attrib.unmap_granularity_alignment =
1430 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1431 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1432
1433 xcopy_lun = &dev->xcopy_lun;
1434 xcopy_lun->lun_se_dev = dev;
1435 init_completion(&xcopy_lun->lun_shutdown_comp);
1436 spin_lock_init(&xcopy_lun->lun_sep_lock);
1437 init_completion(&xcopy_lun->lun_ref_comp);
1438
1439 return dev;
1440 }
1441
1442 int target_configure_device(struct se_device *dev)
1443 {
1444 struct se_hba *hba = dev->se_hba;
1445 int ret;
1446
1447 if (dev->dev_flags & DF_CONFIGURED) {
1448 pr_err("se_dev->se_dev_ptr already set for storage"
1449 " object\n");
1450 return -EEXIST;
1451 }
1452
1453 ret = dev->transport->configure_device(dev);
1454 if (ret)
1455 goto out;
1456 /*
1457 * XXX: there is not much point to have two different values here..
1458 */
1459 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1460 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1461
1462 /*
1463 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1464 */
1465 dev->dev_attrib.hw_max_sectors =
1466 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1467 dev->dev_attrib.hw_block_size);
1468 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1469
1470 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1471 dev->creation_time = get_jiffies_64();
1472
1473 ret = core_setup_alua(dev);
1474 if (ret)
1475 goto out;
1476
1477 /*
1478 * Startup the struct se_device processing thread
1479 */
1480 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1481 dev->transport->name);
1482 if (!dev->tmr_wq) {
1483 pr_err("Unable to create tmr workqueue for %s\n",
1484 dev->transport->name);
1485 ret = -ENOMEM;
1486 goto out_free_alua;
1487 }
1488
1489 /*
1490 * Setup work_queue for QUEUE_FULL
1491 */
1492 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1493
1494 /*
1495 * Preload the initial INQUIRY const values if we are doing
1496 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1497 * passthrough because this is being provided by the backend LLD.
1498 */
1499 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
1500 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1501 strncpy(&dev->t10_wwn.model[0],
1502 dev->transport->inquiry_prod, 16);
1503 strncpy(&dev->t10_wwn.revision[0],
1504 dev->transport->inquiry_rev, 4);
1505 }
1506
1507 scsi_dump_inquiry(dev);
1508
1509 spin_lock(&hba->device_lock);
1510 hba->dev_count++;
1511 spin_unlock(&hba->device_lock);
1512
1513 mutex_lock(&g_device_mutex);
1514 list_add_tail(&dev->g_dev_node, &g_device_list);
1515 mutex_unlock(&g_device_mutex);
1516
1517 dev->dev_flags |= DF_CONFIGURED;
1518
1519 return 0;
1520
1521 out_free_alua:
1522 core_alua_free_lu_gp_mem(dev);
1523 out:
1524 se_release_vpd_for_dev(dev);
1525 return ret;
1526 }
1527
1528 void target_free_device(struct se_device *dev)
1529 {
1530 struct se_hba *hba = dev->se_hba;
1531
1532 WARN_ON(!list_empty(&dev->dev_sep_list));
1533
1534 if (dev->dev_flags & DF_CONFIGURED) {
1535 destroy_workqueue(dev->tmr_wq);
1536
1537 mutex_lock(&g_device_mutex);
1538 list_del(&dev->g_dev_node);
1539 mutex_unlock(&g_device_mutex);
1540
1541 spin_lock(&hba->device_lock);
1542 hba->dev_count--;
1543 spin_unlock(&hba->device_lock);
1544 }
1545
1546 core_alua_free_lu_gp_mem(dev);
1547 core_alua_set_lba_map(dev, NULL, 0, 0);
1548 core_scsi3_free_all_registrations(dev);
1549 se_release_vpd_for_dev(dev);
1550
1551 if (dev->transport->free_prot)
1552 dev->transport->free_prot(dev);
1553
1554 dev->transport->free_device(dev);
1555 }
1556
1557 int core_dev_setup_virtual_lun0(void)
1558 {
1559 struct se_hba *hba;
1560 struct se_device *dev;
1561 char buf[] = "rd_pages=8,rd_nullio=1";
1562 int ret;
1563
1564 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1565 if (IS_ERR(hba))
1566 return PTR_ERR(hba);
1567
1568 dev = target_alloc_device(hba, "virt_lun0");
1569 if (!dev) {
1570 ret = -ENOMEM;
1571 goto out_free_hba;
1572 }
1573
1574 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1575
1576 ret = target_configure_device(dev);
1577 if (ret)
1578 goto out_free_se_dev;
1579
1580 lun0_hba = hba;
1581 g_lun0_dev = dev;
1582 return 0;
1583
1584 out_free_se_dev:
1585 target_free_device(dev);
1586 out_free_hba:
1587 core_delete_hba(hba);
1588 return ret;
1589 }
1590
1591
1592 void core_dev_release_virtual_lun0(void)
1593 {
1594 struct se_hba *hba = lun0_hba;
1595
1596 if (!hba)
1597 return;
1598
1599 if (g_lun0_dev)
1600 target_free_device(g_lun0_dev);
1601 core_delete_hba(hba);
1602 }
1603
1604 /*
1605 * Common CDB parsing for kernel and user passthrough.
1606 */
1607 sense_reason_t
1608 passthrough_parse_cdb(struct se_cmd *cmd,
1609 sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1610 {
1611 unsigned char *cdb = cmd->t_task_cdb;
1612
1613 /*
1614 * Clear a lun set in the cdb if the initiator talking to use spoke
1615 * and old standards version, as we can't assume the underlying device
1616 * won't choke up on it.
1617 */
1618 switch (cdb[0]) {
1619 case READ_10: /* SBC - RDProtect */
1620 case READ_12: /* SBC - RDProtect */
1621 case READ_16: /* SBC - RDProtect */
1622 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1623 case VERIFY: /* SBC - VRProtect */
1624 case VERIFY_16: /* SBC - VRProtect */
1625 case WRITE_VERIFY: /* SBC - VRProtect */
1626 case WRITE_VERIFY_12: /* SBC - VRProtect */
1627 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1628 break;
1629 default:
1630 cdb[1] &= 0x1f; /* clear logical unit number */
1631 break;
1632 }
1633
1634 /*
1635 * For REPORT LUNS we always need to emulate the response, for everything
1636 * else, pass it up.
1637 */
1638 if (cdb[0] == REPORT_LUNS) {
1639 cmd->execute_cmd = spc_emulate_report_luns;
1640 return TCM_NO_SENSE;
1641 }
1642
1643 /* Set DATA_CDB flag for ops that should have it */
1644 switch (cdb[0]) {
1645 case READ_6:
1646 case READ_10:
1647 case READ_12:
1648 case READ_16:
1649 case WRITE_6:
1650 case WRITE_10:
1651 case WRITE_12:
1652 case WRITE_16:
1653 case WRITE_VERIFY:
1654 case WRITE_VERIFY_12:
1655 case 0x8e: /* WRITE_VERIFY_16 */
1656 case COMPARE_AND_WRITE:
1657 case XDWRITEREAD_10:
1658 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1659 break;
1660 case VARIABLE_LENGTH_CMD:
1661 switch (get_unaligned_be16(&cdb[8])) {
1662 case READ_32:
1663 case WRITE_32:
1664 case 0x0c: /* WRITE_VERIFY_32 */
1665 case XDWRITEREAD_32:
1666 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1667 break;
1668 }
1669 }
1670
1671 cmd->execute_cmd = exec_cmd;
1672
1673 return TCM_NO_SENSE;
1674 }
1675 EXPORT_SYMBOL(passthrough_parse_cdb);
Linux kernel - Deliverables
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