1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3  * Filename:  target_core_device.c (based on iscsi_target_device.c)
4  *
5  * This file contains the TCM Virtual Device and Disk Transport
6  * agnostic related functions.
7  *
8  * (c) Copyright 2003-2013 Datera, Inc.
9  *
10  * Nicholas A. Bellinger <nab@kernel.org>
11  *
12  ******************************************************************************/
13 
14 #include <linux/net.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/timer.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/kthread.h>
21 #include <linux/in.h>
22 #include <linux/export.h>
23 #include <linux/t10-pi.h>
24 #include <asm/unaligned.h>
25 #include <net/sock.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi_common.h>
28 #include <scsi/scsi_proto.h>
29 
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33 
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38 
39 static DEFINE_MUTEX(device_mutex);
40 static LIST_HEAD(device_list);
41 static DEFINE_IDR(devices_idr);
42 
43 static struct se_hba *lun0_hba;
44 /* not static, needed by tpg.c */
45 struct se_device *g_lun0_dev;
46 
47 sense_reason_t
48 transport_lookup_cmd_lun(struct se_cmd *se_cmd)
49 {
50 	struct se_lun *se_lun = NULL;
51 	struct se_session *se_sess = se_cmd->se_sess;
52 	struct se_node_acl *nacl = se_sess->se_node_acl;
53 	struct se_dev_entry *deve;
54 	sense_reason_t ret = TCM_NO_SENSE;
55 
56 	rcu_read_lock();
57 	deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
58 	if (deve) {
59 		atomic_long_inc(&deve->total_cmds);
60 
61 		if (se_cmd->data_direction == DMA_TO_DEVICE)
62 			atomic_long_add(se_cmd->data_length,
63 					&deve->write_bytes);
64 		else if (se_cmd->data_direction == DMA_FROM_DEVICE)
65 			atomic_long_add(se_cmd->data_length,
66 					&deve->read_bytes);
67 
68 		if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
69 		    deve->lun_access_ro) {
70 			pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
71 				" Access for 0x%08llx\n",
72 				se_cmd->se_tfo->fabric_name,
73 				se_cmd->orig_fe_lun);
74 			rcu_read_unlock();
75 			return TCM_WRITE_PROTECTED;
76 		}
77 
78 		se_lun = deve->se_lun;
79 
80 		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
81 			se_lun = NULL;
82 			goto out_unlock;
83 		}
84 
85 		se_cmd->se_lun = se_lun;
86 		se_cmd->pr_res_key = deve->pr_res_key;
87 		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
88 		se_cmd->lun_ref_active = true;
89 	}
90 out_unlock:
91 	rcu_read_unlock();
92 
93 	if (!se_lun) {
94 		/*
95 		 * Use the se_portal_group->tpg_virt_lun0 to allow for
96 		 * REPORT_LUNS, et al to be returned when no active
97 		 * MappedLUN=0 exists for this Initiator Port.
98 		 */
99 		if (se_cmd->orig_fe_lun != 0) {
100 			pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
101 				" Access for 0x%08llx from %s\n",
102 				se_cmd->se_tfo->fabric_name,
103 				se_cmd->orig_fe_lun,
104 				nacl->initiatorname);
105 			return TCM_NON_EXISTENT_LUN;
106 		}
107 
108 		/*
109 		 * Force WRITE PROTECT for virtual LUN 0
110 		 */
111 		if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
112 		    (se_cmd->data_direction != DMA_NONE))
113 			return TCM_WRITE_PROTECTED;
114 
115 		se_lun = se_sess->se_tpg->tpg_virt_lun0;
116 		if (!percpu_ref_tryget_live(&se_lun->lun_ref))
117 			return TCM_NON_EXISTENT_LUN;
118 
119 		se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
120 		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
121 		se_cmd->lun_ref_active = true;
122 	}
123 	/*
124 	 * RCU reference protected by percpu se_lun->lun_ref taken above that
125 	 * must drop to zero (including initial reference) before this se_lun
126 	 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
127 	 * target_core_fabric_configfs.c:target_fabric_port_release
128 	 */
129 	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
130 	atomic_long_inc(&se_cmd->se_dev->num_cmds);
131 
132 	if (se_cmd->data_direction == DMA_TO_DEVICE)
133 		atomic_long_add(se_cmd->data_length,
134 				&se_cmd->se_dev->write_bytes);
135 	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
136 		atomic_long_add(se_cmd->data_length,
137 				&se_cmd->se_dev->read_bytes);
138 
139 	return ret;
140 }
141 EXPORT_SYMBOL(transport_lookup_cmd_lun);
142 
143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
144 {
145 	struct se_dev_entry *deve;
146 	struct se_lun *se_lun = NULL;
147 	struct se_session *se_sess = se_cmd->se_sess;
148 	struct se_node_acl *nacl = se_sess->se_node_acl;
149 	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
150 	unsigned long flags;
151 
152 	rcu_read_lock();
153 	deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
154 	if (deve) {
155 		se_lun = deve->se_lun;
156 
157 		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
158 			se_lun = NULL;
159 			goto out_unlock;
160 		}
161 
162 		se_cmd->se_lun = se_lun;
163 		se_cmd->pr_res_key = deve->pr_res_key;
164 		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
165 		se_cmd->lun_ref_active = true;
166 	}
167 out_unlock:
168 	rcu_read_unlock();
169 
170 	if (!se_lun) {
171 		pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
172 			" Access for 0x%08llx for %s\n",
173 			se_cmd->se_tfo->fabric_name,
174 			se_cmd->orig_fe_lun,
175 			nacl->initiatorname);
176 		return -ENODEV;
177 	}
178 	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
179 	se_tmr->tmr_dev = rcu_dereference_raw(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 	rcu_read_lock();
196 	deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
197 	ret = deve && deve->lun_access_ro;
198 	rcu_read_unlock();
199 
200 	return ret;
201 }
202 EXPORT_SYMBOL(target_lun_is_rdonly);
203 
204 /*
205  * This function is called from core_scsi3_emulate_pro_register_and_move()
206  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
207  * when a matching rtpi is found.
208  */
209 struct se_dev_entry *core_get_se_deve_from_rtpi(
210 	struct se_node_acl *nacl,
211 	u16 rtpi)
212 {
213 	struct se_dev_entry *deve;
214 	struct se_lun *lun;
215 	struct se_portal_group *tpg = nacl->se_tpg;
216 
217 	rcu_read_lock();
218 	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
219 		lun = deve->se_lun;
220 		if (!lun) {
221 			pr_err("%s device entries device pointer is"
222 				" NULL, but Initiator has access.\n",
223 				tpg->se_tpg_tfo->fabric_name);
224 			continue;
225 		}
226 		if (lun->lun_tpg->tpg_rtpi != rtpi)
227 			continue;
228 
229 		kref_get(&deve->pr_kref);
230 		rcu_read_unlock();
231 
232 		return deve;
233 	}
234 	rcu_read_unlock();
235 
236 	return NULL;
237 }
238 
239 void core_free_device_list_for_node(
240 	struct se_node_acl *nacl,
241 	struct se_portal_group *tpg)
242 {
243 	struct se_dev_entry *deve;
244 
245 	mutex_lock(&nacl->lun_entry_mutex);
246 	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
247 		core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
248 	mutex_unlock(&nacl->lun_entry_mutex);
249 }
250 
251 void core_update_device_list_access(
252 	u64 mapped_lun,
253 	bool lun_access_ro,
254 	struct se_node_acl *nacl)
255 {
256 	struct se_dev_entry *deve;
257 
258 	mutex_lock(&nacl->lun_entry_mutex);
259 	deve = target_nacl_find_deve(nacl, mapped_lun);
260 	if (deve)
261 		deve->lun_access_ro = lun_access_ro;
262 	mutex_unlock(&nacl->lun_entry_mutex);
263 }
264 
265 /*
266  * Called with rcu_read_lock or nacl->device_list_lock held.
267  */
268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
269 {
270 	struct se_dev_entry *deve;
271 
272 	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
273 		if (deve->mapped_lun == mapped_lun)
274 			return deve;
275 
276 	return NULL;
277 }
278 EXPORT_SYMBOL(target_nacl_find_deve);
279 
280 void target_pr_kref_release(struct kref *kref)
281 {
282 	struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
283 						 pr_kref);
284 	complete(&deve->pr_comp);
285 }
286 
287 /*
288  * Establish UA condition on SCSI device - all LUNs
289  */
290 void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
291 {
292 	struct se_dev_entry *se_deve;
293 	struct se_lun *lun;
294 
295 	spin_lock(&dev->se_port_lock);
296 	list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
297 
298 		spin_lock(&lun->lun_deve_lock);
299 		list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
300 			core_scsi3_ua_allocate(se_deve, asc, ascq);
301 		spin_unlock(&lun->lun_deve_lock);
302 	}
303 	spin_unlock(&dev->se_port_lock);
304 }
305 
306 static void
307 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
308 			     bool skip_new)
309 {
310 	struct se_dev_entry *tmp;
311 
312 	rcu_read_lock();
313 	hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
314 		if (skip_new && tmp == new)
315 			continue;
316 		core_scsi3_ua_allocate(tmp, 0x3F,
317 				       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
318 	}
319 	rcu_read_unlock();
320 }
321 
322 int core_enable_device_list_for_node(
323 	struct se_lun *lun,
324 	struct se_lun_acl *lun_acl,
325 	u64 mapped_lun,
326 	bool lun_access_ro,
327 	struct se_node_acl *nacl,
328 	struct se_portal_group *tpg)
329 {
330 	struct se_dev_entry *orig, *new;
331 
332 	new = kzalloc(sizeof(*new), GFP_KERNEL);
333 	if (!new) {
334 		pr_err("Unable to allocate se_dev_entry memory\n");
335 		return -ENOMEM;
336 	}
337 
338 	spin_lock_init(&new->ua_lock);
339 	INIT_LIST_HEAD(&new->ua_list);
340 	INIT_LIST_HEAD(&new->lun_link);
341 
342 	new->mapped_lun = mapped_lun;
343 	kref_init(&new->pr_kref);
344 	init_completion(&new->pr_comp);
345 
346 	new->lun_access_ro = lun_access_ro;
347 	new->creation_time = get_jiffies_64();
348 	new->attach_count++;
349 
350 	mutex_lock(&nacl->lun_entry_mutex);
351 	orig = target_nacl_find_deve(nacl, mapped_lun);
352 	if (orig && orig->se_lun) {
353 		struct se_lun *orig_lun = orig->se_lun;
354 
355 		if (orig_lun != lun) {
356 			pr_err("Existing orig->se_lun doesn't match new lun"
357 			       " for dynamic -> explicit NodeACL conversion:"
358 				" %s\n", nacl->initiatorname);
359 			mutex_unlock(&nacl->lun_entry_mutex);
360 			kfree(new);
361 			return -EINVAL;
362 		}
363 		if (orig->se_lun_acl != NULL) {
364 			pr_warn_ratelimited("Detected existing explicit"
365 				" se_lun_acl->se_lun_group reference for %s"
366 				" mapped_lun: %llu, failing\n",
367 				 nacl->initiatorname, mapped_lun);
368 			mutex_unlock(&nacl->lun_entry_mutex);
369 			kfree(new);
370 			return -EINVAL;
371 		}
372 
373 		new->se_lun = lun;
374 		new->se_lun_acl = lun_acl;
375 		hlist_del_rcu(&orig->link);
376 		hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
377 		mutex_unlock(&nacl->lun_entry_mutex);
378 
379 		spin_lock(&lun->lun_deve_lock);
380 		list_del(&orig->lun_link);
381 		list_add_tail(&new->lun_link, &lun->lun_deve_list);
382 		spin_unlock(&lun->lun_deve_lock);
383 
384 		kref_put(&orig->pr_kref, target_pr_kref_release);
385 		wait_for_completion(&orig->pr_comp);
386 
387 		target_luns_data_has_changed(nacl, new, true);
388 		kfree_rcu(orig, rcu_head);
389 		return 0;
390 	}
391 
392 	new->se_lun = lun;
393 	new->se_lun_acl = lun_acl;
394 	hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
395 	mutex_unlock(&nacl->lun_entry_mutex);
396 
397 	spin_lock(&lun->lun_deve_lock);
398 	list_add_tail(&new->lun_link, &lun->lun_deve_list);
399 	spin_unlock(&lun->lun_deve_lock);
400 
401 	target_luns_data_has_changed(nacl, new, true);
402 	return 0;
403 }
404 
405 void core_disable_device_list_for_node(
406 	struct se_lun *lun,
407 	struct se_dev_entry *orig,
408 	struct se_node_acl *nacl,
409 	struct se_portal_group *tpg)
410 {
411 	/*
412 	 * rcu_dereference_raw protected by se_lun->lun_group symlink
413 	 * reference to se_device->dev_group.
414 	 */
415 	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
416 
417 	lockdep_assert_held(&nacl->lun_entry_mutex);
418 
419 	/*
420 	 * If the MappedLUN entry is being disabled, the entry in
421 	 * lun->lun_deve_list must be removed now before clearing the
422 	 * struct se_dev_entry pointers below as logic in
423 	 * core_alua_do_transition_tg_pt() depends on these being present.
424 	 *
425 	 * deve->se_lun_acl will be NULL for demo-mode created LUNs
426 	 * that have not been explicitly converted to MappedLUNs ->
427 	 * struct se_lun_acl, but we remove deve->lun_link from
428 	 * lun->lun_deve_list. This also means that active UAs and
429 	 * NodeACL context specific PR metadata for demo-mode
430 	 * MappedLUN *deve will be released below..
431 	 */
432 	spin_lock(&lun->lun_deve_lock);
433 	list_del(&orig->lun_link);
434 	spin_unlock(&lun->lun_deve_lock);
435 	/*
436 	 * Disable struct se_dev_entry LUN ACL mapping
437 	 */
438 	core_scsi3_ua_release_all(orig);
439 
440 	hlist_del_rcu(&orig->link);
441 	clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
442 	orig->lun_access_ro = false;
443 	orig->creation_time = 0;
444 	orig->attach_count--;
445 	/*
446 	 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
447 	 * or REGISTER_AND_MOVE PR operation to complete.
448 	 */
449 	kref_put(&orig->pr_kref, target_pr_kref_release);
450 	wait_for_completion(&orig->pr_comp);
451 
452 	kfree_rcu(orig, rcu_head);
453 
454 	core_scsi3_free_pr_reg_from_nacl(dev, nacl);
455 	target_luns_data_has_changed(nacl, NULL, false);
456 }
457 
458 /*      core_clear_lun_from_tpg():
459  *
460  *
461  */
462 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
463 {
464 	struct se_node_acl *nacl;
465 	struct se_dev_entry *deve;
466 
467 	mutex_lock(&tpg->acl_node_mutex);
468 	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469 
470 		mutex_lock(&nacl->lun_entry_mutex);
471 		hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
472 			if (lun != deve->se_lun)
473 				continue;
474 
475 			core_disable_device_list_for_node(lun, deve, nacl, tpg);
476 		}
477 		mutex_unlock(&nacl->lun_entry_mutex);
478 	}
479 	mutex_unlock(&tpg->acl_node_mutex);
480 }
481 
482 static void se_release_vpd_for_dev(struct se_device *dev)
483 {
484 	struct t10_vpd *vpd, *vpd_tmp;
485 
486 	spin_lock(&dev->t10_wwn.t10_vpd_lock);
487 	list_for_each_entry_safe(vpd, vpd_tmp,
488 			&dev->t10_wwn.t10_vpd_list, vpd_list) {
489 		list_del(&vpd->vpd_list);
490 		kfree(vpd);
491 	}
492 	spin_unlock(&dev->t10_wwn.t10_vpd_lock);
493 }
494 
495 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
496 {
497 	u32 aligned_max_sectors;
498 	u32 alignment;
499 	/*
500 	 * Limit max_sectors to a PAGE_SIZE aligned value for modern
501 	 * transport_allocate_data_tasks() operation.
502 	 */
503 	alignment = max(1ul, PAGE_SIZE / block_size);
504 	aligned_max_sectors = rounddown(max_sectors, alignment);
505 
506 	if (max_sectors != aligned_max_sectors)
507 		pr_info("Rounding down aligned max_sectors from %u to %u\n",
508 			max_sectors, aligned_max_sectors);
509 
510 	return aligned_max_sectors;
511 }
512 
513 int core_dev_add_lun(
514 	struct se_portal_group *tpg,
515 	struct se_device *dev,
516 	struct se_lun *lun)
517 {
518 	int rc;
519 
520 	rc = core_tpg_add_lun(tpg, lun, false, dev);
521 	if (rc < 0)
522 		return rc;
523 
524 	pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
525 		" CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
526 		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
527 		tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
528 	/*
529 	 * Update LUN maps for dynamically added initiators when
530 	 * generate_node_acl is enabled.
531 	 */
532 	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
533 		struct se_node_acl *acl;
534 
535 		mutex_lock(&tpg->acl_node_mutex);
536 		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
537 			if (acl->dynamic_node_acl &&
538 			    (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
539 			     !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
540 				core_tpg_add_node_to_devs(acl, tpg, lun);
541 			}
542 		}
543 		mutex_unlock(&tpg->acl_node_mutex);
544 	}
545 
546 	return 0;
547 }
548 
549 /*      core_dev_del_lun():
550  *
551  *
552  */
553 void core_dev_del_lun(
554 	struct se_portal_group *tpg,
555 	struct se_lun *lun)
556 {
557 	pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
558 		" device object\n", tpg->se_tpg_tfo->fabric_name,
559 		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
560 		tpg->se_tpg_tfo->fabric_name);
561 
562 	core_tpg_remove_lun(tpg, lun);
563 }
564 
565 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
566 	struct se_portal_group *tpg,
567 	struct se_node_acl *nacl,
568 	u64 mapped_lun,
569 	int *ret)
570 {
571 	struct se_lun_acl *lacl;
572 
573 	if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
574 		pr_err("%s InitiatorName exceeds maximum size.\n",
575 			tpg->se_tpg_tfo->fabric_name);
576 		*ret = -EOVERFLOW;
577 		return NULL;
578 	}
579 	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
580 	if (!lacl) {
581 		pr_err("Unable to allocate memory for struct se_lun_acl.\n");
582 		*ret = -ENOMEM;
583 		return NULL;
584 	}
585 
586 	lacl->mapped_lun = mapped_lun;
587 	lacl->se_lun_nacl = nacl;
588 
589 	return lacl;
590 }
591 
592 int core_dev_add_initiator_node_lun_acl(
593 	struct se_portal_group *tpg,
594 	struct se_lun_acl *lacl,
595 	struct se_lun *lun,
596 	bool lun_access_ro)
597 {
598 	struct se_node_acl *nacl = lacl->se_lun_nacl;
599 	/*
600 	 * rcu_dereference_raw protected by se_lun->lun_group symlink
601 	 * reference to se_device->dev_group.
602 	 */
603 	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
604 
605 	if (!nacl)
606 		return -EINVAL;
607 
608 	if (lun->lun_access_ro)
609 		lun_access_ro = true;
610 
611 	lacl->se_lun = lun;
612 
613 	if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
614 			lun_access_ro, nacl, tpg) < 0)
615 		return -EINVAL;
616 
617 	pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
618 		" InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
619 		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
620 		lun_access_ro ? "RO" : "RW",
621 		nacl->initiatorname);
622 	/*
623 	 * Check to see if there are any existing persistent reservation APTPL
624 	 * pre-registrations that need to be enabled for this LUN ACL..
625 	 */
626 	core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
627 					    lacl->mapped_lun);
628 	return 0;
629 }
630 
631 int core_dev_del_initiator_node_lun_acl(
632 	struct se_lun *lun,
633 	struct se_lun_acl *lacl)
634 {
635 	struct se_portal_group *tpg = lun->lun_tpg;
636 	struct se_node_acl *nacl;
637 	struct se_dev_entry *deve;
638 
639 	nacl = lacl->se_lun_nacl;
640 	if (!nacl)
641 		return -EINVAL;
642 
643 	mutex_lock(&nacl->lun_entry_mutex);
644 	deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
645 	if (deve)
646 		core_disable_device_list_for_node(lun, deve, nacl, tpg);
647 	mutex_unlock(&nacl->lun_entry_mutex);
648 
649 	pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
650 		" InitiatorNode: %s Mapped LUN: %llu\n",
651 		tpg->se_tpg_tfo->fabric_name,
652 		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
653 		nacl->initiatorname, lacl->mapped_lun);
654 
655 	return 0;
656 }
657 
658 void core_dev_free_initiator_node_lun_acl(
659 	struct se_portal_group *tpg,
660 	struct se_lun_acl *lacl)
661 {
662 	pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
663 		" Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
664 		tpg->se_tpg_tfo->tpg_get_tag(tpg),
665 		tpg->se_tpg_tfo->fabric_name,
666 		lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
667 
668 	kfree(lacl);
669 }
670 
671 static void scsi_dump_inquiry(struct se_device *dev)
672 {
673 	struct t10_wwn *wwn = &dev->t10_wwn;
674 	int device_type = dev->transport->get_device_type(dev);
675 
676 	/*
677 	 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
678 	 */
679 	pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
680 		wwn->vendor);
681 	pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
682 		wwn->model);
683 	pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
684 		wwn->revision);
685 	pr_debug("  Type:   %s ", scsi_device_type(device_type));
686 }
687 
688 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
689 {
690 	struct se_device *dev;
691 	struct se_lun *xcopy_lun;
692 	int i;
693 
694 	dev = hba->backend->ops->alloc_device(hba, name);
695 	if (!dev)
696 		return NULL;
697 
698 	dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
699 	if (!dev->queues) {
700 		dev->transport->free_device(dev);
701 		return NULL;
702 	}
703 
704 	dev->queue_cnt = nr_cpu_ids;
705 	for (i = 0; i < dev->queue_cnt; i++) {
706 		struct se_device_queue *q;
707 
708 		q = &dev->queues[i];
709 		INIT_LIST_HEAD(&q->state_list);
710 		spin_lock_init(&q->lock);
711 
712 		init_llist_head(&q->sq.cmd_list);
713 		INIT_WORK(&q->sq.work, target_queued_submit_work);
714 	}
715 
716 	dev->se_hba = hba;
717 	dev->transport = hba->backend->ops;
718 	dev->transport_flags = dev->transport->transport_flags_default;
719 	dev->prot_length = sizeof(struct t10_pi_tuple);
720 	dev->hba_index = hba->hba_index;
721 
722 	INIT_LIST_HEAD(&dev->dev_sep_list);
723 	INIT_LIST_HEAD(&dev->dev_tmr_list);
724 	INIT_LIST_HEAD(&dev->delayed_cmd_list);
725 	INIT_LIST_HEAD(&dev->qf_cmd_list);
726 	spin_lock_init(&dev->delayed_cmd_lock);
727 	spin_lock_init(&dev->dev_reservation_lock);
728 	spin_lock_init(&dev->se_port_lock);
729 	spin_lock_init(&dev->se_tmr_lock);
730 	spin_lock_init(&dev->qf_cmd_lock);
731 	sema_init(&dev->caw_sem, 1);
732 	INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
733 	spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
734 	INIT_LIST_HEAD(&dev->t10_pr.registration_list);
735 	INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
736 	spin_lock_init(&dev->t10_pr.registration_lock);
737 	spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
738 	INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
739 	spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
740 	INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
741 	spin_lock_init(&dev->t10_alua.lba_map_lock);
742 
743 	INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
744 	mutex_init(&dev->lun_reset_mutex);
745 
746 	dev->t10_wwn.t10_dev = dev;
747 	/*
748 	 * Use OpenFabrics IEEE Company ID: 00 14 05
749 	 */
750 	dev->t10_wwn.company_id = 0x001405;
751 
752 	dev->t10_alua.t10_dev = dev;
753 
754 	dev->dev_attrib.da_dev = dev;
755 	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
756 	dev->dev_attrib.emulate_dpo = 1;
757 	dev->dev_attrib.emulate_fua_write = 1;
758 	dev->dev_attrib.emulate_fua_read = 1;
759 	dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
760 	dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
761 	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
762 	dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
763 	dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
764 	dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
765 	dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
766 	dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
767 	dev->dev_attrib.emulate_rsoc = DA_EMULATE_RSOC;
768 	dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
769 	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
770 	dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
771 	dev->dev_attrib.is_nonrot = DA_IS_NONROT;
772 	dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
773 	dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
774 	dev->dev_attrib.max_unmap_block_desc_count =
775 		DA_MAX_UNMAP_BLOCK_DESC_COUNT;
776 	dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
777 	dev->dev_attrib.unmap_granularity_alignment =
778 				DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
779 	dev->dev_attrib.unmap_zeroes_data =
780 				DA_UNMAP_ZEROES_DATA_DEFAULT;
781 	dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
782 
783 	xcopy_lun = &dev->xcopy_lun;
784 	rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
785 	init_completion(&xcopy_lun->lun_shutdown_comp);
786 	INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
787 	INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
788 	mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
789 	xcopy_lun->lun_tpg = &xcopy_pt_tpg;
790 
791 	/* Preload the default INQUIRY const values */
792 	strscpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
793 	strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
794 		sizeof(dev->t10_wwn.model));
795 	strscpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
796 		sizeof(dev->t10_wwn.revision));
797 
798 	return dev;
799 }
800 
801 /*
802  * Check if the underlying struct block_device supports discard and if yes
803  * configure the UNMAP parameters.
804  */
805 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
806 				       struct block_device *bdev)
807 {
808 	int block_size = bdev_logical_block_size(bdev);
809 
810 	if (!bdev_max_discard_sectors(bdev))
811 		return false;
812 
813 	attrib->max_unmap_lba_count =
814 		bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
815 	/*
816 	 * Currently hardcoded to 1 in Linux/SCSI code..
817 	 */
818 	attrib->max_unmap_block_desc_count = 1;
819 	attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
820 	attrib->unmap_granularity_alignment =
821 		bdev_discard_alignment(bdev) / block_size;
822 	return true;
823 }
824 EXPORT_SYMBOL(target_configure_unmap_from_queue);
825 
826 /*
827  * Convert from blocksize advertised to the initiator to the 512 byte
828  * units unconditionally used by the Linux block layer.
829  */
830 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
831 {
832 	switch (dev->dev_attrib.block_size) {
833 	case 4096:
834 		return lb << 3;
835 	case 2048:
836 		return lb << 2;
837 	case 1024:
838 		return lb << 1;
839 	default:
840 		return lb;
841 	}
842 }
843 EXPORT_SYMBOL(target_to_linux_sector);
844 
845 struct devices_idr_iter {
846 	struct config_item *prev_item;
847 	int (*fn)(struct se_device *dev, void *data);
848 	void *data;
849 };
850 
851 static int target_devices_idr_iter(int id, void *p, void *data)
852 	 __must_hold(&device_mutex)
853 {
854 	struct devices_idr_iter *iter = data;
855 	struct se_device *dev = p;
856 	int ret;
857 
858 	config_item_put(iter->prev_item);
859 	iter->prev_item = NULL;
860 
861 	/*
862 	 * We add the device early to the idr, so it can be used
863 	 * by backend modules during configuration. We do not want
864 	 * to allow other callers to access partially setup devices,
865 	 * so we skip them here.
866 	 */
867 	if (!target_dev_configured(dev))
868 		return 0;
869 
870 	iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
871 	if (!iter->prev_item)
872 		return 0;
873 	mutex_unlock(&device_mutex);
874 
875 	ret = iter->fn(dev, iter->data);
876 
877 	mutex_lock(&device_mutex);
878 	return ret;
879 }
880 
881 /**
882  * target_for_each_device - iterate over configured devices
883  * @fn: iterator function
884  * @data: pointer to data that will be passed to fn
885  *
886  * fn must return 0 to continue looping over devices. non-zero will break
887  * from the loop and return that value to the caller.
888  */
889 int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
890 			   void *data)
891 {
892 	struct devices_idr_iter iter = { .fn = fn, .data = data };
893 	int ret;
894 
895 	mutex_lock(&device_mutex);
896 	ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
897 	mutex_unlock(&device_mutex);
898 	config_item_put(iter.prev_item);
899 	return ret;
900 }
901 
902 int target_configure_device(struct se_device *dev)
903 {
904 	struct se_hba *hba = dev->se_hba;
905 	int ret, id;
906 
907 	if (target_dev_configured(dev)) {
908 		pr_err("se_dev->se_dev_ptr already set for storage"
909 				" object\n");
910 		return -EEXIST;
911 	}
912 
913 	/*
914 	 * Add early so modules like tcmu can use during its
915 	 * configuration.
916 	 */
917 	mutex_lock(&device_mutex);
918 	/*
919 	 * Use cyclic to try and avoid collisions with devices
920 	 * that were recently removed.
921 	 */
922 	id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
923 	mutex_unlock(&device_mutex);
924 	if (id < 0) {
925 		ret = -ENOMEM;
926 		goto out;
927 	}
928 	dev->dev_index = id;
929 
930 	ret = dev->transport->configure_device(dev);
931 	if (ret)
932 		goto out_free_index;
933 
934 	if (dev->transport->configure_unmap &&
935 	    dev->transport->configure_unmap(dev)) {
936 		pr_debug("Discard support available, but disabled by default.\n");
937 	}
938 
939 	/*
940 	 * XXX: there is not much point to have two different values here..
941 	 */
942 	dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
943 	dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
944 
945 	/*
946 	 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
947 	 */
948 	dev->dev_attrib.hw_max_sectors =
949 		se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
950 					 dev->dev_attrib.hw_block_size);
951 	dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
952 
953 	dev->creation_time = get_jiffies_64();
954 
955 	ret = core_setup_alua(dev);
956 	if (ret)
957 		goto out_destroy_device;
958 
959 	/*
960 	 * Setup work_queue for QUEUE_FULL
961 	 */
962 	INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
963 
964 	scsi_dump_inquiry(dev);
965 
966 	spin_lock(&hba->device_lock);
967 	hba->dev_count++;
968 	spin_unlock(&hba->device_lock);
969 
970 	dev->dev_flags |= DF_CONFIGURED;
971 
972 	return 0;
973 
974 out_destroy_device:
975 	dev->transport->destroy_device(dev);
976 out_free_index:
977 	mutex_lock(&device_mutex);
978 	idr_remove(&devices_idr, dev->dev_index);
979 	mutex_unlock(&device_mutex);
980 out:
981 	se_release_vpd_for_dev(dev);
982 	return ret;
983 }
984 
985 void target_free_device(struct se_device *dev)
986 {
987 	struct se_hba *hba = dev->se_hba;
988 
989 	WARN_ON(!list_empty(&dev->dev_sep_list));
990 
991 	if (target_dev_configured(dev)) {
992 		dev->transport->destroy_device(dev);
993 
994 		mutex_lock(&device_mutex);
995 		idr_remove(&devices_idr, dev->dev_index);
996 		mutex_unlock(&device_mutex);
997 
998 		spin_lock(&hba->device_lock);
999 		hba->dev_count--;
1000 		spin_unlock(&hba->device_lock);
1001 	}
1002 
1003 	core_alua_free_lu_gp_mem(dev);
1004 	core_alua_set_lba_map(dev, NULL, 0, 0);
1005 	core_scsi3_free_all_registrations(dev);
1006 	se_release_vpd_for_dev(dev);
1007 
1008 	if (dev->transport->free_prot)
1009 		dev->transport->free_prot(dev);
1010 
1011 	kfree(dev->queues);
1012 	dev->transport->free_device(dev);
1013 }
1014 
1015 int core_dev_setup_virtual_lun0(void)
1016 {
1017 	struct se_hba *hba;
1018 	struct se_device *dev;
1019 	char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
1020 	int ret;
1021 
1022 	hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1023 	if (IS_ERR(hba))
1024 		return PTR_ERR(hba);
1025 
1026 	dev = target_alloc_device(hba, "virt_lun0");
1027 	if (!dev) {
1028 		ret = -ENOMEM;
1029 		goto out_free_hba;
1030 	}
1031 
1032 	hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1033 
1034 	ret = target_configure_device(dev);
1035 	if (ret)
1036 		goto out_free_se_dev;
1037 
1038 	lun0_hba = hba;
1039 	g_lun0_dev = dev;
1040 	return 0;
1041 
1042 out_free_se_dev:
1043 	target_free_device(dev);
1044 out_free_hba:
1045 	core_delete_hba(hba);
1046 	return ret;
1047 }
1048 
1049 
1050 void core_dev_release_virtual_lun0(void)
1051 {
1052 	struct se_hba *hba = lun0_hba;
1053 
1054 	if (!hba)
1055 		return;
1056 
1057 	if (g_lun0_dev)
1058 		target_free_device(g_lun0_dev);
1059 	core_delete_hba(hba);
1060 }
1061 
1062 /*
1063  * Common CDB parsing for kernel and user passthrough.
1064  */
1065 sense_reason_t
1066 passthrough_parse_cdb(struct se_cmd *cmd,
1067 	sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1068 {
1069 	unsigned char *cdb = cmd->t_task_cdb;
1070 	struct se_device *dev = cmd->se_dev;
1071 	unsigned int size;
1072 
1073 	/*
1074 	 * For REPORT LUNS we always need to emulate the response, for everything
1075 	 * else, pass it up.
1076 	 */
1077 	if (cdb[0] == REPORT_LUNS) {
1078 		cmd->execute_cmd = spc_emulate_report_luns;
1079 		return TCM_NO_SENSE;
1080 	}
1081 
1082 	/*
1083 	 * With emulate_pr disabled, all reservation requests should fail,
1084 	 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
1085 	 */
1086 	if (!dev->dev_attrib.emulate_pr &&
1087 	    ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1088 	     (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1089 	     (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1090 	     (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1091 		return TCM_UNSUPPORTED_SCSI_OPCODE;
1092 	}
1093 
1094 	/*
1095 	 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
1096 	 * emulate the response, since tcmu does not have the information
1097 	 * required to process these commands.
1098 	 */
1099 	if (!(dev->transport_flags &
1100 	      TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1101 		if (cdb[0] == PERSISTENT_RESERVE_IN) {
1102 			cmd->execute_cmd = target_scsi3_emulate_pr_in;
1103 			size = get_unaligned_be16(&cdb[7]);
1104 			return target_cmd_size_check(cmd, size);
1105 		}
1106 		if (cdb[0] == PERSISTENT_RESERVE_OUT) {
1107 			cmd->execute_cmd = target_scsi3_emulate_pr_out;
1108 			size = get_unaligned_be32(&cdb[5]);
1109 			return target_cmd_size_check(cmd, size);
1110 		}
1111 
1112 		if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
1113 			cmd->execute_cmd = target_scsi2_reservation_release;
1114 			if (cdb[0] == RELEASE_10)
1115 				size = get_unaligned_be16(&cdb[7]);
1116 			else
1117 				size = cmd->data_length;
1118 			return target_cmd_size_check(cmd, size);
1119 		}
1120 		if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
1121 			cmd->execute_cmd = target_scsi2_reservation_reserve;
1122 			if (cdb[0] == RESERVE_10)
1123 				size = get_unaligned_be16(&cdb[7]);
1124 			else
1125 				size = cmd->data_length;
1126 			return target_cmd_size_check(cmd, size);
1127 		}
1128 	}
1129 
1130 	/* Set DATA_CDB flag for ops that should have it */
1131 	switch (cdb[0]) {
1132 	case READ_6:
1133 	case READ_10:
1134 	case READ_12:
1135 	case READ_16:
1136 	case WRITE_6:
1137 	case WRITE_10:
1138 	case WRITE_12:
1139 	case WRITE_16:
1140 	case WRITE_VERIFY:
1141 	case WRITE_VERIFY_12:
1142 	case WRITE_VERIFY_16:
1143 	case COMPARE_AND_WRITE:
1144 	case XDWRITEREAD_10:
1145 		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1146 		break;
1147 	case VARIABLE_LENGTH_CMD:
1148 		switch (get_unaligned_be16(&cdb[8])) {
1149 		case READ_32:
1150 		case WRITE_32:
1151 		case WRITE_VERIFY_32:
1152 		case XDWRITEREAD_32:
1153 			cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1154 			break;
1155 		}
1156 	}
1157 
1158 	cmd->execute_cmd = exec_cmd;
1159 
1160 	return TCM_NO_SENSE;
1161 }
1162 EXPORT_SYMBOL(passthrough_parse_cdb);
1163