1 /*******************************************************************************
2  * Filename:  target_core_configfs.c
3  *
4  * This file contains ConfigFS logic for the Generic Target Engine project.
5  *
6  * (c) Copyright 2008-2013 Datera, Inc.
7  *
8  * Nicholas A. Bellinger <nab@kernel.org>
9  *
10  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  ****************************************************************************/
22 
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <generated/utsrelease.h>
26 #include <linux/utsname.h>
27 #include <linux/init.h>
28 #include <linux/fs.h>
29 #include <linux/namei.h>
30 #include <linux/slab.h>
31 #include <linux/types.h>
32 #include <linux/delay.h>
33 #include <linux/unistd.h>
34 #include <linux/string.h>
35 #include <linux/parser.h>
36 #include <linux/syscalls.h>
37 #include <linux/configfs.h>
38 #include <linux/spinlock.h>
39 
40 #include <target/target_core_base.h>
41 #include <target/target_core_backend.h>
42 #include <target/target_core_fabric.h>
43 
44 #include "target_core_internal.h"
45 #include "target_core_alua.h"
46 #include "target_core_pr.h"
47 #include "target_core_rd.h"
48 #include "target_core_xcopy.h"
49 
50 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)		\
51 static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
52 {									\
53 	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
54 									\
55 	cit->ct_item_ops = _item_ops;					\
56 	cit->ct_group_ops = _group_ops;					\
57 	cit->ct_attrs = _attrs;						\
58 	cit->ct_owner = tb->ops->owner;					\
59 	pr_debug("Setup generic %s\n", __stringify(_name));		\
60 }
61 
62 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)			\
63 static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
64 {									\
65 	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
66 									\
67 	cit->ct_item_ops = _item_ops;					\
68 	cit->ct_group_ops = _group_ops;					\
69 	cit->ct_attrs = tb->ops->tb_##_name##_attrs;			\
70 	cit->ct_owner = tb->ops->owner;					\
71 	pr_debug("Setup generic %s\n", __stringify(_name));		\
72 }
73 
74 extern struct t10_alua_lu_gp *default_lu_gp;
75 
76 static LIST_HEAD(g_tf_list);
77 static DEFINE_MUTEX(g_tf_lock);
78 
79 static struct config_group target_core_hbagroup;
80 static struct config_group alua_group;
81 static struct config_group alua_lu_gps_group;
82 
83 static inline struct se_hba *
84 item_to_hba(struct config_item *item)
85 {
86 	return container_of(to_config_group(item), struct se_hba, hba_group);
87 }
88 
89 /*
90  * Attributes for /sys/kernel/config/target/
91  */
92 static ssize_t target_core_item_version_show(struct config_item *item,
93 		char *page)
94 {
95 	return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
96 		" on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
97 		utsname()->sysname, utsname()->machine);
98 }
99 
100 CONFIGFS_ATTR_RO(target_core_item_, version);
101 
102 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
103 static char db_root_stage[DB_ROOT_LEN];
104 
105 static ssize_t target_core_item_dbroot_show(struct config_item *item,
106 					    char *page)
107 {
108 	return sprintf(page, "%s\n", db_root);
109 }
110 
111 static ssize_t target_core_item_dbroot_store(struct config_item *item,
112 					const char *page, size_t count)
113 {
114 	ssize_t read_bytes;
115 	struct file *fp;
116 
117 	mutex_lock(&g_tf_lock);
118 	if (!list_empty(&g_tf_list)) {
119 		mutex_unlock(&g_tf_lock);
120 		pr_err("db_root: cannot be changed: target drivers registered");
121 		return -EINVAL;
122 	}
123 
124 	if (count > (DB_ROOT_LEN - 1)) {
125 		mutex_unlock(&g_tf_lock);
126 		pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
127 		       (int)count, DB_ROOT_LEN - 1);
128 		return -EINVAL;
129 	}
130 
131 	read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
132 	if (!read_bytes) {
133 		mutex_unlock(&g_tf_lock);
134 		return -EINVAL;
135 	}
136 	if (db_root_stage[read_bytes - 1] == '\n')
137 		db_root_stage[read_bytes - 1] = '\0';
138 
139 	/* validate new db root before accepting it */
140 	fp = filp_open(db_root_stage, O_RDONLY, 0);
141 	if (IS_ERR(fp)) {
142 		mutex_unlock(&g_tf_lock);
143 		pr_err("db_root: cannot open: %s\n", db_root_stage);
144 		return -EINVAL;
145 	}
146 	if (!S_ISDIR(file_inode(fp)->i_mode)) {
147 		filp_close(fp, NULL);
148 		mutex_unlock(&g_tf_lock);
149 		pr_err("db_root: not a directory: %s\n", db_root_stage);
150 		return -EINVAL;
151 	}
152 	filp_close(fp, NULL);
153 
154 	strncpy(db_root, db_root_stage, read_bytes);
155 
156 	mutex_unlock(&g_tf_lock);
157 
158 	return read_bytes;
159 }
160 
161 CONFIGFS_ATTR(target_core_item_, dbroot);
162 
163 static struct target_fabric_configfs *target_core_get_fabric(
164 	const char *name)
165 {
166 	struct target_fabric_configfs *tf;
167 
168 	if (!name)
169 		return NULL;
170 
171 	mutex_lock(&g_tf_lock);
172 	list_for_each_entry(tf, &g_tf_list, tf_list) {
173 		if (!strcmp(tf->tf_ops->name, name)) {
174 			atomic_inc(&tf->tf_access_cnt);
175 			mutex_unlock(&g_tf_lock);
176 			return tf;
177 		}
178 	}
179 	mutex_unlock(&g_tf_lock);
180 
181 	return NULL;
182 }
183 
184 /*
185  * Called from struct target_core_group_ops->make_group()
186  */
187 static struct config_group *target_core_register_fabric(
188 	struct config_group *group,
189 	const char *name)
190 {
191 	struct target_fabric_configfs *tf;
192 	int ret;
193 
194 	pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
195 			" %s\n", group, name);
196 
197 	tf = target_core_get_fabric(name);
198 	if (!tf) {
199 		pr_debug("target_core_register_fabric() trying autoload for %s\n",
200 			 name);
201 
202 		/*
203 		 * Below are some hardcoded request_module() calls to automatically
204 		 * local fabric modules when the following is called:
205 		 *
206 		 * mkdir -p /sys/kernel/config/target/$MODULE_NAME
207 		 *
208 		 * Note that this does not limit which TCM fabric module can be
209 		 * registered, but simply provids auto loading logic for modules with
210 		 * mkdir(2) system calls with known TCM fabric modules.
211 		 */
212 
213 		if (!strncmp(name, "iscsi", 5)) {
214 			/*
215 			 * Automatically load the LIO Target fabric module when the
216 			 * following is called:
217 			 *
218 			 * mkdir -p $CONFIGFS/target/iscsi
219 			 */
220 			ret = request_module("iscsi_target_mod");
221 			if (ret < 0) {
222 				pr_debug("request_module() failed for"
223 				         " iscsi_target_mod.ko: %d\n", ret);
224 				return ERR_PTR(-EINVAL);
225 			}
226 		} else if (!strncmp(name, "loopback", 8)) {
227 			/*
228 			 * Automatically load the tcm_loop fabric module when the
229 			 * following is called:
230 			 *
231 			 * mkdir -p $CONFIGFS/target/loopback
232 			 */
233 			ret = request_module("tcm_loop");
234 			if (ret < 0) {
235 				pr_debug("request_module() failed for"
236 				         " tcm_loop.ko: %d\n", ret);
237 				return ERR_PTR(-EINVAL);
238 			}
239 		}
240 
241 		tf = target_core_get_fabric(name);
242 	}
243 
244 	if (!tf) {
245 		pr_debug("target_core_get_fabric() failed for %s\n",
246 		         name);
247 		return ERR_PTR(-EINVAL);
248 	}
249 	pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
250 			" %s\n", tf->tf_ops->name);
251 	/*
252 	 * On a successful target_core_get_fabric() look, the returned
253 	 * struct target_fabric_configfs *tf will contain a usage reference.
254 	 */
255 	pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
256 			&tf->tf_wwn_cit);
257 
258 	config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
259 
260 	config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
261 			&tf->tf_discovery_cit);
262 	configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
263 
264 	pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
265 			" %s\n", tf->tf_group.cg_item.ci_name);
266 	return &tf->tf_group;
267 }
268 
269 /*
270  * Called from struct target_core_group_ops->drop_item()
271  */
272 static void target_core_deregister_fabric(
273 	struct config_group *group,
274 	struct config_item *item)
275 {
276 	struct target_fabric_configfs *tf = container_of(
277 		to_config_group(item), struct target_fabric_configfs, tf_group);
278 
279 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
280 		" tf list\n", config_item_name(item));
281 
282 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
283 			" %s\n", tf->tf_ops->name);
284 	atomic_dec(&tf->tf_access_cnt);
285 
286 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
287 			" %s\n", config_item_name(item));
288 
289 	configfs_remove_default_groups(&tf->tf_group);
290 	config_item_put(item);
291 }
292 
293 static struct configfs_group_operations target_core_fabric_group_ops = {
294 	.make_group	= &target_core_register_fabric,
295 	.drop_item	= &target_core_deregister_fabric,
296 };
297 
298 /*
299  * All item attributes appearing in /sys/kernel/target/ appear here.
300  */
301 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
302 	&target_core_item_attr_version,
303 	&target_core_item_attr_dbroot,
304 	NULL,
305 };
306 
307 /*
308  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
309  */
310 static const struct config_item_type target_core_fabrics_item = {
311 	.ct_group_ops	= &target_core_fabric_group_ops,
312 	.ct_attrs	= target_core_fabric_item_attrs,
313 	.ct_owner	= THIS_MODULE,
314 };
315 
316 static struct configfs_subsystem target_core_fabrics = {
317 	.su_group = {
318 		.cg_item = {
319 			.ci_namebuf = "target",
320 			.ci_type = &target_core_fabrics_item,
321 		},
322 	},
323 };
324 
325 int target_depend_item(struct config_item *item)
326 {
327 	return configfs_depend_item(&target_core_fabrics, item);
328 }
329 EXPORT_SYMBOL(target_depend_item);
330 
331 void target_undepend_item(struct config_item *item)
332 {
333 	return configfs_undepend_item(item);
334 }
335 EXPORT_SYMBOL(target_undepend_item);
336 
337 /*##############################################################################
338 // Start functions called by external Target Fabrics Modules
339 //############################################################################*/
340 
341 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
342 {
343 	if (!tfo->name) {
344 		pr_err("Missing tfo->name\n");
345 		return -EINVAL;
346 	}
347 	if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
348 		pr_err("Passed name: %s exceeds TARGET_FABRIC"
349 			"_NAME_SIZE\n", tfo->name);
350 		return -EINVAL;
351 	}
352 	if (!tfo->get_fabric_name) {
353 		pr_err("Missing tfo->get_fabric_name()\n");
354 		return -EINVAL;
355 	}
356 	if (!tfo->tpg_get_wwn) {
357 		pr_err("Missing tfo->tpg_get_wwn()\n");
358 		return -EINVAL;
359 	}
360 	if (!tfo->tpg_get_tag) {
361 		pr_err("Missing tfo->tpg_get_tag()\n");
362 		return -EINVAL;
363 	}
364 	if (!tfo->tpg_check_demo_mode) {
365 		pr_err("Missing tfo->tpg_check_demo_mode()\n");
366 		return -EINVAL;
367 	}
368 	if (!tfo->tpg_check_demo_mode_cache) {
369 		pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
370 		return -EINVAL;
371 	}
372 	if (!tfo->tpg_check_demo_mode_write_protect) {
373 		pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
374 		return -EINVAL;
375 	}
376 	if (!tfo->tpg_check_prod_mode_write_protect) {
377 		pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
378 		return -EINVAL;
379 	}
380 	if (!tfo->tpg_get_inst_index) {
381 		pr_err("Missing tfo->tpg_get_inst_index()\n");
382 		return -EINVAL;
383 	}
384 	if (!tfo->release_cmd) {
385 		pr_err("Missing tfo->release_cmd()\n");
386 		return -EINVAL;
387 	}
388 	if (!tfo->sess_get_index) {
389 		pr_err("Missing tfo->sess_get_index()\n");
390 		return -EINVAL;
391 	}
392 	if (!tfo->write_pending) {
393 		pr_err("Missing tfo->write_pending()\n");
394 		return -EINVAL;
395 	}
396 	if (!tfo->write_pending_status) {
397 		pr_err("Missing tfo->write_pending_status()\n");
398 		return -EINVAL;
399 	}
400 	if (!tfo->set_default_node_attributes) {
401 		pr_err("Missing tfo->set_default_node_attributes()\n");
402 		return -EINVAL;
403 	}
404 	if (!tfo->get_cmd_state) {
405 		pr_err("Missing tfo->get_cmd_state()\n");
406 		return -EINVAL;
407 	}
408 	if (!tfo->queue_data_in) {
409 		pr_err("Missing tfo->queue_data_in()\n");
410 		return -EINVAL;
411 	}
412 	if (!tfo->queue_status) {
413 		pr_err("Missing tfo->queue_status()\n");
414 		return -EINVAL;
415 	}
416 	if (!tfo->queue_tm_rsp) {
417 		pr_err("Missing tfo->queue_tm_rsp()\n");
418 		return -EINVAL;
419 	}
420 	if (!tfo->aborted_task) {
421 		pr_err("Missing tfo->aborted_task()\n");
422 		return -EINVAL;
423 	}
424 	if (!tfo->check_stop_free) {
425 		pr_err("Missing tfo->check_stop_free()\n");
426 		return -EINVAL;
427 	}
428 	/*
429 	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
430 	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
431 	 * target_core_fabric_configfs.c WWN+TPG group context code.
432 	 */
433 	if (!tfo->fabric_make_wwn) {
434 		pr_err("Missing tfo->fabric_make_wwn()\n");
435 		return -EINVAL;
436 	}
437 	if (!tfo->fabric_drop_wwn) {
438 		pr_err("Missing tfo->fabric_drop_wwn()\n");
439 		return -EINVAL;
440 	}
441 	if (!tfo->fabric_make_tpg) {
442 		pr_err("Missing tfo->fabric_make_tpg()\n");
443 		return -EINVAL;
444 	}
445 	if (!tfo->fabric_drop_tpg) {
446 		pr_err("Missing tfo->fabric_drop_tpg()\n");
447 		return -EINVAL;
448 	}
449 
450 	return 0;
451 }
452 
453 int target_register_template(const struct target_core_fabric_ops *fo)
454 {
455 	struct target_fabric_configfs *tf;
456 	int ret;
457 
458 	ret = target_fabric_tf_ops_check(fo);
459 	if (ret)
460 		return ret;
461 
462 	tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
463 	if (!tf) {
464 		pr_err("%s: could not allocate memory!\n", __func__);
465 		return -ENOMEM;
466 	}
467 
468 	INIT_LIST_HEAD(&tf->tf_list);
469 	atomic_set(&tf->tf_access_cnt, 0);
470 	tf->tf_ops = fo;
471 	target_fabric_setup_cits(tf);
472 
473 	mutex_lock(&g_tf_lock);
474 	list_add_tail(&tf->tf_list, &g_tf_list);
475 	mutex_unlock(&g_tf_lock);
476 
477 	return 0;
478 }
479 EXPORT_SYMBOL(target_register_template);
480 
481 void target_unregister_template(const struct target_core_fabric_ops *fo)
482 {
483 	struct target_fabric_configfs *t;
484 
485 	mutex_lock(&g_tf_lock);
486 	list_for_each_entry(t, &g_tf_list, tf_list) {
487 		if (!strcmp(t->tf_ops->name, fo->name)) {
488 			BUG_ON(atomic_read(&t->tf_access_cnt));
489 			list_del(&t->tf_list);
490 			mutex_unlock(&g_tf_lock);
491 			/*
492 			 * Wait for any outstanding fabric se_deve_entry->rcu_head
493 			 * callbacks to complete post kfree_rcu(), before allowing
494 			 * fabric driver unload of TFO->module to proceed.
495 			 */
496 			rcu_barrier();
497 			kfree(t);
498 			return;
499 		}
500 	}
501 	mutex_unlock(&g_tf_lock);
502 }
503 EXPORT_SYMBOL(target_unregister_template);
504 
505 /*##############################################################################
506 // Stop functions called by external Target Fabrics Modules
507 //############################################################################*/
508 
509 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
510 {
511 	return container_of(to_config_group(item), struct se_dev_attrib,
512 			da_group);
513 }
514 
515 /* Start functions for struct config_item_type tb_dev_attrib_cit */
516 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)					\
517 static ssize_t _name##_show(struct config_item *item, char *page)	\
518 {									\
519 	return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
520 }
521 
522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
530 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
531 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
532 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
533 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
534 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
535 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_format);
536 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
537 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
538 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
539 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
540 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
541 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
542 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
543 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
544 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
545 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
546 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
547 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
548 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
549 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
550 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
551 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
552 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
553 
554 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)				\
555 static ssize_t _name##_store(struct config_item *item, const char *page,\
556 		size_t count)						\
557 {									\
558 	struct se_dev_attrib *da = to_attrib(item);			\
559 	u32 val;							\
560 	int ret;							\
561 									\
562 	ret = kstrtou32(page, 0, &val);					\
563 	if (ret < 0)							\
564 		return ret;						\
565 	da->_name = val;						\
566 	return count;							\
567 }
568 
569 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
570 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
571 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
572 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
573 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
574 
575 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)				\
576 static ssize_t _name##_store(struct config_item *item, const char *page,	\
577 		size_t count)						\
578 {									\
579 	struct se_dev_attrib *da = to_attrib(item);			\
580 	bool flag;							\
581 	int ret;							\
582 									\
583 	ret = strtobool(page, &flag);					\
584 	if (ret < 0)							\
585 		return ret;						\
586 	da->_name = flag;						\
587 	return count;							\
588 }
589 
590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
592 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
593 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
594 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
595 
596 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)				\
597 static ssize_t _name##_store(struct config_item *item, const char *page,\
598 		size_t count)						\
599 {									\
600 	printk_once(KERN_WARNING					\
601 		"ignoring deprecated %s attribute\n",			\
602 		__stringify(_name));					\
603 	return count;							\
604 }
605 
606 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
607 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
608 
609 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
610 {
611 	const char *configname;
612 
613 	configname = config_item_name(&dev->dev_group.cg_item);
614 	if (strlen(configname) >= 16) {
615 		pr_warn("dev[%p]: Backstore name '%s' is too long for "
616 			"INQUIRY_MODEL, truncating to 16 bytes\n", dev,
617 			configname);
618 	}
619 	snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
620 }
621 
622 static ssize_t emulate_model_alias_store(struct config_item *item,
623 		const char *page, size_t count)
624 {
625 	struct se_dev_attrib *da = to_attrib(item);
626 	struct se_device *dev = da->da_dev;
627 	bool flag;
628 	int ret;
629 
630 	if (dev->export_count) {
631 		pr_err("dev[%p]: Unable to change model alias"
632 			" while export_count is %d\n",
633 			dev, dev->export_count);
634 		return -EINVAL;
635 	}
636 
637 	ret = strtobool(page, &flag);
638 	if (ret < 0)
639 		return ret;
640 
641 	if (flag) {
642 		dev_set_t10_wwn_model_alias(dev);
643 	} else {
644 		strncpy(&dev->t10_wwn.model[0],
645 			dev->transport->inquiry_prod, 16);
646 	}
647 	da->emulate_model_alias = flag;
648 	return count;
649 }
650 
651 static ssize_t emulate_write_cache_store(struct config_item *item,
652 		const char *page, size_t count)
653 {
654 	struct se_dev_attrib *da = to_attrib(item);
655 	bool flag;
656 	int ret;
657 
658 	ret = strtobool(page, &flag);
659 	if (ret < 0)
660 		return ret;
661 
662 	if (flag && da->da_dev->transport->get_write_cache) {
663 		pr_err("emulate_write_cache not supported for this device\n");
664 		return -EINVAL;
665 	}
666 
667 	da->emulate_write_cache = flag;
668 	pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
669 			da->da_dev, flag);
670 	return count;
671 }
672 
673 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
674 		const char *page, size_t count)
675 {
676 	struct se_dev_attrib *da = to_attrib(item);
677 	u32 val;
678 	int ret;
679 
680 	ret = kstrtou32(page, 0, &val);
681 	if (ret < 0)
682 		return ret;
683 
684 	if (val != 0 && val != 1 && val != 2) {
685 		pr_err("Illegal value %d\n", val);
686 		return -EINVAL;
687 	}
688 
689 	if (da->da_dev->export_count) {
690 		pr_err("dev[%p]: Unable to change SE Device"
691 			" UA_INTRLCK_CTRL while export_count is %d\n",
692 			da->da_dev, da->da_dev->export_count);
693 		return -EINVAL;
694 	}
695 	da->emulate_ua_intlck_ctrl = val;
696 	pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
697 		da->da_dev, val);
698 	return count;
699 }
700 
701 static ssize_t emulate_tas_store(struct config_item *item,
702 		const char *page, size_t count)
703 {
704 	struct se_dev_attrib *da = to_attrib(item);
705 	bool flag;
706 	int ret;
707 
708 	ret = strtobool(page, &flag);
709 	if (ret < 0)
710 		return ret;
711 
712 	if (da->da_dev->export_count) {
713 		pr_err("dev[%p]: Unable to change SE Device TAS while"
714 			" export_count is %d\n",
715 			da->da_dev, da->da_dev->export_count);
716 		return -EINVAL;
717 	}
718 	da->emulate_tas = flag;
719 	pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
720 		da->da_dev, flag ? "Enabled" : "Disabled");
721 
722 	return count;
723 }
724 
725 static ssize_t emulate_tpu_store(struct config_item *item,
726 		const char *page, size_t count)
727 {
728 	struct se_dev_attrib *da = to_attrib(item);
729 	bool flag;
730 	int ret;
731 
732 	ret = strtobool(page, &flag);
733 	if (ret < 0)
734 		return ret;
735 
736 	/*
737 	 * We expect this value to be non-zero when generic Block Layer
738 	 * Discard supported is detected iblock_create_virtdevice().
739 	 */
740 	if (flag && !da->max_unmap_block_desc_count) {
741 		pr_err("Generic Block Discard not supported\n");
742 		return -ENOSYS;
743 	}
744 
745 	da->emulate_tpu = flag;
746 	pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
747 		da->da_dev, flag);
748 	return count;
749 }
750 
751 static ssize_t emulate_tpws_store(struct config_item *item,
752 		const char *page, size_t count)
753 {
754 	struct se_dev_attrib *da = to_attrib(item);
755 	bool flag;
756 	int ret;
757 
758 	ret = strtobool(page, &flag);
759 	if (ret < 0)
760 		return ret;
761 
762 	/*
763 	 * We expect this value to be non-zero when generic Block Layer
764 	 * Discard supported is detected iblock_create_virtdevice().
765 	 */
766 	if (flag && !da->max_unmap_block_desc_count) {
767 		pr_err("Generic Block Discard not supported\n");
768 		return -ENOSYS;
769 	}
770 
771 	da->emulate_tpws = flag;
772 	pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
773 				da->da_dev, flag);
774 	return count;
775 }
776 
777 static ssize_t pi_prot_type_store(struct config_item *item,
778 		const char *page, size_t count)
779 {
780 	struct se_dev_attrib *da = to_attrib(item);
781 	int old_prot = da->pi_prot_type, ret;
782 	struct se_device *dev = da->da_dev;
783 	u32 flag;
784 
785 	ret = kstrtou32(page, 0, &flag);
786 	if (ret < 0)
787 		return ret;
788 
789 	if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
790 		pr_err("Illegal value %d for pi_prot_type\n", flag);
791 		return -EINVAL;
792 	}
793 	if (flag == 2) {
794 		pr_err("DIF TYPE2 protection currently not supported\n");
795 		return -ENOSYS;
796 	}
797 	if (da->hw_pi_prot_type) {
798 		pr_warn("DIF protection enabled on underlying hardware,"
799 			" ignoring\n");
800 		return count;
801 	}
802 	if (!dev->transport->init_prot || !dev->transport->free_prot) {
803 		/* 0 is only allowed value for non-supporting backends */
804 		if (flag == 0)
805 			return count;
806 
807 		pr_err("DIF protection not supported by backend: %s\n",
808 		       dev->transport->name);
809 		return -ENOSYS;
810 	}
811 	if (!(dev->dev_flags & DF_CONFIGURED)) {
812 		pr_err("DIF protection requires device to be configured\n");
813 		return -ENODEV;
814 	}
815 	if (dev->export_count) {
816 		pr_err("dev[%p]: Unable to change SE Device PROT type while"
817 		       " export_count is %d\n", dev, dev->export_count);
818 		return -EINVAL;
819 	}
820 
821 	da->pi_prot_type = flag;
822 
823 	if (flag && !old_prot) {
824 		ret = dev->transport->init_prot(dev);
825 		if (ret) {
826 			da->pi_prot_type = old_prot;
827 			da->pi_prot_verify = (bool) da->pi_prot_type;
828 			return ret;
829 		}
830 
831 	} else if (!flag && old_prot) {
832 		dev->transport->free_prot(dev);
833 	}
834 
835 	da->pi_prot_verify = (bool) da->pi_prot_type;
836 	pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
837 	return count;
838 }
839 
840 static ssize_t pi_prot_format_store(struct config_item *item,
841 		const char *page, size_t count)
842 {
843 	struct se_dev_attrib *da = to_attrib(item);
844 	struct se_device *dev = da->da_dev;
845 	bool flag;
846 	int ret;
847 
848 	ret = strtobool(page, &flag);
849 	if (ret < 0)
850 		return ret;
851 
852 	if (!flag)
853 		return count;
854 
855 	if (!dev->transport->format_prot) {
856 		pr_err("DIF protection format not supported by backend %s\n",
857 		       dev->transport->name);
858 		return -ENOSYS;
859 	}
860 	if (!(dev->dev_flags & DF_CONFIGURED)) {
861 		pr_err("DIF protection format requires device to be configured\n");
862 		return -ENODEV;
863 	}
864 	if (dev->export_count) {
865 		pr_err("dev[%p]: Unable to format SE Device PROT type while"
866 		       " export_count is %d\n", dev, dev->export_count);
867 		return -EINVAL;
868 	}
869 
870 	ret = dev->transport->format_prot(dev);
871 	if (ret)
872 		return ret;
873 
874 	pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
875 	return count;
876 }
877 
878 static ssize_t pi_prot_verify_store(struct config_item *item,
879 		const char *page, size_t count)
880 {
881 	struct se_dev_attrib *da = to_attrib(item);
882 	bool flag;
883 	int ret;
884 
885 	ret = strtobool(page, &flag);
886 	if (ret < 0)
887 		return ret;
888 
889 	if (!flag) {
890 		da->pi_prot_verify = flag;
891 		return count;
892 	}
893 	if (da->hw_pi_prot_type) {
894 		pr_warn("DIF protection enabled on underlying hardware,"
895 			" ignoring\n");
896 		return count;
897 	}
898 	if (!da->pi_prot_type) {
899 		pr_warn("DIF protection not supported by backend, ignoring\n");
900 		return count;
901 	}
902 	da->pi_prot_verify = flag;
903 
904 	return count;
905 }
906 
907 static ssize_t force_pr_aptpl_store(struct config_item *item,
908 		const char *page, size_t count)
909 {
910 	struct se_dev_attrib *da = to_attrib(item);
911 	bool flag;
912 	int ret;
913 
914 	ret = strtobool(page, &flag);
915 	if (ret < 0)
916 		return ret;
917 	if (da->da_dev->export_count) {
918 		pr_err("dev[%p]: Unable to set force_pr_aptpl while"
919 		       " export_count is %d\n",
920 		       da->da_dev, da->da_dev->export_count);
921 		return -EINVAL;
922 	}
923 
924 	da->force_pr_aptpl = flag;
925 	pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
926 	return count;
927 }
928 
929 static ssize_t emulate_rest_reord_store(struct config_item *item,
930 		const char *page, size_t count)
931 {
932 	struct se_dev_attrib *da = to_attrib(item);
933 	bool flag;
934 	int ret;
935 
936 	ret = strtobool(page, &flag);
937 	if (ret < 0)
938 		return ret;
939 
940 	if (flag != 0) {
941 		printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
942 			" reordering not implemented\n", da->da_dev);
943 		return -ENOSYS;
944 	}
945 	da->emulate_rest_reord = flag;
946 	pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
947 		da->da_dev, flag);
948 	return count;
949 }
950 
951 static ssize_t unmap_zeroes_data_store(struct config_item *item,
952 		const char *page, size_t count)
953 {
954 	struct se_dev_attrib *da = to_attrib(item);
955 	bool flag;
956 	int ret;
957 
958 	ret = strtobool(page, &flag);
959 	if (ret < 0)
960 		return ret;
961 
962 	if (da->da_dev->export_count) {
963 		pr_err("dev[%p]: Unable to change SE Device"
964 		       " unmap_zeroes_data while export_count is %d\n",
965 		       da->da_dev, da->da_dev->export_count);
966 		return -EINVAL;
967 	}
968 	/*
969 	 * We expect this value to be non-zero when generic Block Layer
970 	 * Discard supported is detected iblock_configure_device().
971 	 */
972 	if (flag && !da->max_unmap_block_desc_count) {
973 		pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
974 		       " because max_unmap_block_desc_count is zero\n",
975 		       da->da_dev);
976 		return -ENOSYS;
977 	}
978 	da->unmap_zeroes_data = flag;
979 	pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
980 		 da->da_dev, flag);
981 	return count;
982 }
983 
984 /*
985  * Note, this can only be called on unexported SE Device Object.
986  */
987 static ssize_t queue_depth_store(struct config_item *item,
988 		const char *page, size_t count)
989 {
990 	struct se_dev_attrib *da = to_attrib(item);
991 	struct se_device *dev = da->da_dev;
992 	u32 val;
993 	int ret;
994 
995 	ret = kstrtou32(page, 0, &val);
996 	if (ret < 0)
997 		return ret;
998 
999 	if (dev->export_count) {
1000 		pr_err("dev[%p]: Unable to change SE Device TCQ while"
1001 			" export_count is %d\n",
1002 			dev, dev->export_count);
1003 		return -EINVAL;
1004 	}
1005 	if (!val) {
1006 		pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1007 		return -EINVAL;
1008 	}
1009 
1010 	if (val > dev->dev_attrib.queue_depth) {
1011 		if (val > dev->dev_attrib.hw_queue_depth) {
1012 			pr_err("dev[%p]: Passed queue_depth:"
1013 				" %u exceeds TCM/SE_Device MAX"
1014 				" TCQ: %u\n", dev, val,
1015 				dev->dev_attrib.hw_queue_depth);
1016 			return -EINVAL;
1017 		}
1018 	}
1019 	da->queue_depth = dev->queue_depth = val;
1020 	pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1021 	return count;
1022 }
1023 
1024 static ssize_t optimal_sectors_store(struct config_item *item,
1025 		const char *page, size_t count)
1026 {
1027 	struct se_dev_attrib *da = to_attrib(item);
1028 	u32 val;
1029 	int ret;
1030 
1031 	ret = kstrtou32(page, 0, &val);
1032 	if (ret < 0)
1033 		return ret;
1034 
1035 	if (da->da_dev->export_count) {
1036 		pr_err("dev[%p]: Unable to change SE Device"
1037 			" optimal_sectors while export_count is %d\n",
1038 			da->da_dev, da->da_dev->export_count);
1039 		return -EINVAL;
1040 	}
1041 	if (val > da->hw_max_sectors) {
1042 		pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1043 			" greater than hw_max_sectors: %u\n",
1044 			da->da_dev, val, da->hw_max_sectors);
1045 		return -EINVAL;
1046 	}
1047 
1048 	da->optimal_sectors = val;
1049 	pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1050 			da->da_dev, val);
1051 	return count;
1052 }
1053 
1054 static ssize_t block_size_store(struct config_item *item,
1055 		const char *page, size_t count)
1056 {
1057 	struct se_dev_attrib *da = to_attrib(item);
1058 	u32 val;
1059 	int ret;
1060 
1061 	ret = kstrtou32(page, 0, &val);
1062 	if (ret < 0)
1063 		return ret;
1064 
1065 	if (da->da_dev->export_count) {
1066 		pr_err("dev[%p]: Unable to change SE Device block_size"
1067 			" while export_count is %d\n",
1068 			da->da_dev, da->da_dev->export_count);
1069 		return -EINVAL;
1070 	}
1071 
1072 	if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1073 		pr_err("dev[%p]: Illegal value for block_device: %u"
1074 			" for SE device, must be 512, 1024, 2048 or 4096\n",
1075 			da->da_dev, val);
1076 		return -EINVAL;
1077 	}
1078 
1079 	da->block_size = val;
1080 	if (da->max_bytes_per_io)
1081 		da->hw_max_sectors = da->max_bytes_per_io / val;
1082 
1083 	pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1084 			da->da_dev, val);
1085 	return count;
1086 }
1087 
1088 static ssize_t alua_support_show(struct config_item *item, char *page)
1089 {
1090 	struct se_dev_attrib *da = to_attrib(item);
1091 	u8 flags = da->da_dev->transport->transport_flags;
1092 
1093 	return snprintf(page, PAGE_SIZE, "%d\n",
1094 			flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1095 }
1096 
1097 static ssize_t pgr_support_show(struct config_item *item, char *page)
1098 {
1099 	struct se_dev_attrib *da = to_attrib(item);
1100 	u8 flags = da->da_dev->transport->transport_flags;
1101 
1102 	return snprintf(page, PAGE_SIZE, "%d\n",
1103 			flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1104 }
1105 
1106 CONFIGFS_ATTR(, emulate_model_alias);
1107 CONFIGFS_ATTR(, emulate_dpo);
1108 CONFIGFS_ATTR(, emulate_fua_write);
1109 CONFIGFS_ATTR(, emulate_fua_read);
1110 CONFIGFS_ATTR(, emulate_write_cache);
1111 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1112 CONFIGFS_ATTR(, emulate_tas);
1113 CONFIGFS_ATTR(, emulate_tpu);
1114 CONFIGFS_ATTR(, emulate_tpws);
1115 CONFIGFS_ATTR(, emulate_caw);
1116 CONFIGFS_ATTR(, emulate_3pc);
1117 CONFIGFS_ATTR(, pi_prot_type);
1118 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1119 CONFIGFS_ATTR(, pi_prot_format);
1120 CONFIGFS_ATTR(, pi_prot_verify);
1121 CONFIGFS_ATTR(, enforce_pr_isids);
1122 CONFIGFS_ATTR(, is_nonrot);
1123 CONFIGFS_ATTR(, emulate_rest_reord);
1124 CONFIGFS_ATTR(, force_pr_aptpl);
1125 CONFIGFS_ATTR_RO(, hw_block_size);
1126 CONFIGFS_ATTR(, block_size);
1127 CONFIGFS_ATTR_RO(, hw_max_sectors);
1128 CONFIGFS_ATTR(, optimal_sectors);
1129 CONFIGFS_ATTR_RO(, hw_queue_depth);
1130 CONFIGFS_ATTR(, queue_depth);
1131 CONFIGFS_ATTR(, max_unmap_lba_count);
1132 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1133 CONFIGFS_ATTR(, unmap_granularity);
1134 CONFIGFS_ATTR(, unmap_granularity_alignment);
1135 CONFIGFS_ATTR(, unmap_zeroes_data);
1136 CONFIGFS_ATTR(, max_write_same_len);
1137 CONFIGFS_ATTR_RO(, alua_support);
1138 CONFIGFS_ATTR_RO(, pgr_support);
1139 
1140 /*
1141  * dev_attrib attributes for devices using the target core SBC/SPC
1142  * interpreter.  Any backend using spc_parse_cdb should be using
1143  * these.
1144  */
1145 struct configfs_attribute *sbc_attrib_attrs[] = {
1146 	&attr_emulate_model_alias,
1147 	&attr_emulate_dpo,
1148 	&attr_emulate_fua_write,
1149 	&attr_emulate_fua_read,
1150 	&attr_emulate_write_cache,
1151 	&attr_emulate_ua_intlck_ctrl,
1152 	&attr_emulate_tas,
1153 	&attr_emulate_tpu,
1154 	&attr_emulate_tpws,
1155 	&attr_emulate_caw,
1156 	&attr_emulate_3pc,
1157 	&attr_pi_prot_type,
1158 	&attr_hw_pi_prot_type,
1159 	&attr_pi_prot_format,
1160 	&attr_pi_prot_verify,
1161 	&attr_enforce_pr_isids,
1162 	&attr_is_nonrot,
1163 	&attr_emulate_rest_reord,
1164 	&attr_force_pr_aptpl,
1165 	&attr_hw_block_size,
1166 	&attr_block_size,
1167 	&attr_hw_max_sectors,
1168 	&attr_optimal_sectors,
1169 	&attr_hw_queue_depth,
1170 	&attr_queue_depth,
1171 	&attr_max_unmap_lba_count,
1172 	&attr_max_unmap_block_desc_count,
1173 	&attr_unmap_granularity,
1174 	&attr_unmap_granularity_alignment,
1175 	&attr_unmap_zeroes_data,
1176 	&attr_max_write_same_len,
1177 	&attr_alua_support,
1178 	&attr_pgr_support,
1179 	NULL,
1180 };
1181 EXPORT_SYMBOL(sbc_attrib_attrs);
1182 
1183 /*
1184  * Minimal dev_attrib attributes for devices passing through CDBs.
1185  * In this case we only provide a few read-only attributes for
1186  * backwards compatibility.
1187  */
1188 struct configfs_attribute *passthrough_attrib_attrs[] = {
1189 	&attr_hw_pi_prot_type,
1190 	&attr_hw_block_size,
1191 	&attr_hw_max_sectors,
1192 	&attr_hw_queue_depth,
1193 	&attr_alua_support,
1194 	&attr_pgr_support,
1195 	NULL,
1196 };
1197 EXPORT_SYMBOL(passthrough_attrib_attrs);
1198 
1199 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1200 TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
1201 
1202 /* End functions for struct config_item_type tb_dev_attrib_cit */
1203 
1204 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1205 
1206 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1207 {
1208 	return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1209 }
1210 
1211 /*
1212  * VPD page 0x80 Unit serial
1213  */
1214 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1215 		char *page)
1216 {
1217 	return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1218 		&to_t10_wwn(item)->unit_serial[0]);
1219 }
1220 
1221 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1222 		const char *page, size_t count)
1223 {
1224 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1225 	struct se_device *dev = t10_wwn->t10_dev;
1226 	unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
1227 
1228 	/*
1229 	 * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1230 	 * from the struct scsi_device level firmware, do not allow
1231 	 * VPD Unit Serial to be emulated.
1232 	 *
1233 	 * Note this struct scsi_device could also be emulating VPD
1234 	 * information from its drivers/scsi LLD.  But for now we assume
1235 	 * it is doing 'the right thing' wrt a world wide unique
1236 	 * VPD Unit Serial Number that OS dependent multipath can depend on.
1237 	 */
1238 	if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1239 		pr_err("Underlying SCSI device firmware provided VPD"
1240 			" Unit Serial, ignoring request\n");
1241 		return -EOPNOTSUPP;
1242 	}
1243 
1244 	if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1245 		pr_err("Emulated VPD Unit Serial exceeds"
1246 		" INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1247 		return -EOVERFLOW;
1248 	}
1249 	/*
1250 	 * Check to see if any active $FABRIC_MOD exports exist.  If they
1251 	 * do exist, fail here as changing this information on the fly
1252 	 * (underneath the initiator side OS dependent multipath code)
1253 	 * could cause negative effects.
1254 	 */
1255 	if (dev->export_count) {
1256 		pr_err("Unable to set VPD Unit Serial while"
1257 			" active %d $FABRIC_MOD exports exist\n",
1258 			dev->export_count);
1259 		return -EINVAL;
1260 	}
1261 
1262 	/*
1263 	 * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1264 	 *
1265 	 * Also, strip any newline added from the userspace
1266 	 * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1267 	 */
1268 	memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
1269 	snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1270 	snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1271 			"%s", strstrip(buf));
1272 	dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1273 
1274 	pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1275 			" %s\n", dev->t10_wwn.unit_serial);
1276 
1277 	return count;
1278 }
1279 
1280 /*
1281  * VPD page 0x83 Protocol Identifier
1282  */
1283 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1284 		char *page)
1285 {
1286 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1287 	struct t10_vpd *vpd;
1288 	unsigned char buf[VPD_TMP_BUF_SIZE];
1289 	ssize_t len = 0;
1290 
1291 	memset(buf, 0, VPD_TMP_BUF_SIZE);
1292 
1293 	spin_lock(&t10_wwn->t10_vpd_lock);
1294 	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1295 		if (!vpd->protocol_identifier_set)
1296 			continue;
1297 
1298 		transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1299 
1300 		if (len + strlen(buf) >= PAGE_SIZE)
1301 			break;
1302 
1303 		len += sprintf(page+len, "%s", buf);
1304 	}
1305 	spin_unlock(&t10_wwn->t10_vpd_lock);
1306 
1307 	return len;
1308 }
1309 
1310 /*
1311  * Generic wrapper for dumping VPD identifiers by association.
1312  */
1313 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)				\
1314 static ssize_t target_wwn_##_name##_show(struct config_item *item,	\
1315 		char *page)						\
1316 {									\
1317 	struct t10_wwn *t10_wwn = to_t10_wwn(item);			\
1318 	struct t10_vpd *vpd;						\
1319 	unsigned char buf[VPD_TMP_BUF_SIZE];				\
1320 	ssize_t len = 0;						\
1321 									\
1322 	spin_lock(&t10_wwn->t10_vpd_lock);				\
1323 	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {	\
1324 		if (vpd->association != _assoc)				\
1325 			continue;					\
1326 									\
1327 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1328 		transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);	\
1329 		if (len + strlen(buf) >= PAGE_SIZE)			\
1330 			break;						\
1331 		len += sprintf(page+len, "%s", buf);			\
1332 									\
1333 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1334 		transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1335 		if (len + strlen(buf) >= PAGE_SIZE)			\
1336 			break;						\
1337 		len += sprintf(page+len, "%s", buf);			\
1338 									\
1339 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1340 		transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1341 		if (len + strlen(buf) >= PAGE_SIZE)			\
1342 			break;						\
1343 		len += sprintf(page+len, "%s", buf);			\
1344 	}								\
1345 	spin_unlock(&t10_wwn->t10_vpd_lock);				\
1346 									\
1347 	return len;							\
1348 }
1349 
1350 /* VPD page 0x83 Association: Logical Unit */
1351 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1352 /* VPD page 0x83 Association: Target Port */
1353 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1354 /* VPD page 0x83 Association: SCSI Target Device */
1355 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1356 
1357 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1358 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1359 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1360 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1361 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1362 
1363 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1364 	&target_wwn_attr_vpd_unit_serial,
1365 	&target_wwn_attr_vpd_protocol_identifier,
1366 	&target_wwn_attr_vpd_assoc_logical_unit,
1367 	&target_wwn_attr_vpd_assoc_target_port,
1368 	&target_wwn_attr_vpd_assoc_scsi_target_device,
1369 	NULL,
1370 };
1371 
1372 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1373 
1374 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1375 
1376 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1377 
1378 static struct se_device *pr_to_dev(struct config_item *item)
1379 {
1380 	return container_of(to_config_group(item), struct se_device,
1381 			dev_pr_group);
1382 }
1383 
1384 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1385 		char *page)
1386 {
1387 	struct se_node_acl *se_nacl;
1388 	struct t10_pr_registration *pr_reg;
1389 	char i_buf[PR_REG_ISID_ID_LEN];
1390 
1391 	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1392 
1393 	pr_reg = dev->dev_pr_res_holder;
1394 	if (!pr_reg)
1395 		return sprintf(page, "No SPC-3 Reservation holder\n");
1396 
1397 	se_nacl = pr_reg->pr_reg_nacl;
1398 	core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1399 
1400 	return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1401 		se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1402 		se_nacl->initiatorname, i_buf);
1403 }
1404 
1405 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1406 		char *page)
1407 {
1408 	struct se_node_acl *se_nacl;
1409 	ssize_t len;
1410 
1411 	se_nacl = dev->dev_reserved_node_acl;
1412 	if (se_nacl) {
1413 		len = sprintf(page,
1414 			      "SPC-2 Reservation: %s Initiator: %s\n",
1415 			      se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1416 			      se_nacl->initiatorname);
1417 	} else {
1418 		len = sprintf(page, "No SPC-2 Reservation holder\n");
1419 	}
1420 	return len;
1421 }
1422 
1423 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1424 {
1425 	struct se_device *dev = pr_to_dev(item);
1426 	int ret;
1427 
1428 	if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1429 		return sprintf(page, "Passthrough\n");
1430 
1431 	spin_lock(&dev->dev_reservation_lock);
1432 	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1433 		ret = target_core_dev_pr_show_spc2_res(dev, page);
1434 	else
1435 		ret = target_core_dev_pr_show_spc3_res(dev, page);
1436 	spin_unlock(&dev->dev_reservation_lock);
1437 	return ret;
1438 }
1439 
1440 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1441 		char *page)
1442 {
1443 	struct se_device *dev = pr_to_dev(item);
1444 	ssize_t len = 0;
1445 
1446 	spin_lock(&dev->dev_reservation_lock);
1447 	if (!dev->dev_pr_res_holder) {
1448 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1449 	} else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1450 		len = sprintf(page, "SPC-3 Reservation: All Target"
1451 			" Ports registration\n");
1452 	} else {
1453 		len = sprintf(page, "SPC-3 Reservation: Single"
1454 			" Target Port registration\n");
1455 	}
1456 
1457 	spin_unlock(&dev->dev_reservation_lock);
1458 	return len;
1459 }
1460 
1461 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1462 		char *page)
1463 {
1464 	return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1465 }
1466 
1467 
1468 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1469 		char *page)
1470 {
1471 	struct se_device *dev = pr_to_dev(item);
1472 	struct se_node_acl *se_nacl;
1473 	struct se_portal_group *se_tpg;
1474 	struct t10_pr_registration *pr_reg;
1475 	const struct target_core_fabric_ops *tfo;
1476 	ssize_t len = 0;
1477 
1478 	spin_lock(&dev->dev_reservation_lock);
1479 	pr_reg = dev->dev_pr_res_holder;
1480 	if (!pr_reg) {
1481 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1482 		goto out_unlock;
1483 	}
1484 
1485 	se_nacl = pr_reg->pr_reg_nacl;
1486 	se_tpg = se_nacl->se_tpg;
1487 	tfo = se_tpg->se_tpg_tfo;
1488 
1489 	len += sprintf(page+len, "SPC-3 Reservation: %s"
1490 		" Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1491 		tfo->tpg_get_wwn(se_tpg));
1492 	len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1493 		" Identifier Tag: %hu %s Portal Group Tag: %hu"
1494 		" %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1495 		tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1496 		tfo->get_fabric_name(), pr_reg->pr_aptpl_target_lun);
1497 
1498 out_unlock:
1499 	spin_unlock(&dev->dev_reservation_lock);
1500 	return len;
1501 }
1502 
1503 
1504 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1505 		char *page)
1506 {
1507 	struct se_device *dev = pr_to_dev(item);
1508 	const struct target_core_fabric_ops *tfo;
1509 	struct t10_pr_registration *pr_reg;
1510 	unsigned char buf[384];
1511 	char i_buf[PR_REG_ISID_ID_LEN];
1512 	ssize_t len = 0;
1513 	int reg_count = 0;
1514 
1515 	len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1516 
1517 	spin_lock(&dev->t10_pr.registration_lock);
1518 	list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1519 			pr_reg_list) {
1520 
1521 		memset(buf, 0, 384);
1522 		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1523 		tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1524 		core_pr_dump_initiator_port(pr_reg, i_buf,
1525 					PR_REG_ISID_ID_LEN);
1526 		sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1527 			tfo->get_fabric_name(),
1528 			pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1529 			pr_reg->pr_res_generation);
1530 
1531 		if (len + strlen(buf) >= PAGE_SIZE)
1532 			break;
1533 
1534 		len += sprintf(page+len, "%s", buf);
1535 		reg_count++;
1536 	}
1537 	spin_unlock(&dev->t10_pr.registration_lock);
1538 
1539 	if (!reg_count)
1540 		len += sprintf(page+len, "None\n");
1541 
1542 	return len;
1543 }
1544 
1545 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1546 {
1547 	struct se_device *dev = pr_to_dev(item);
1548 	struct t10_pr_registration *pr_reg;
1549 	ssize_t len = 0;
1550 
1551 	spin_lock(&dev->dev_reservation_lock);
1552 	pr_reg = dev->dev_pr_res_holder;
1553 	if (pr_reg) {
1554 		len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1555 			core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1556 	} else {
1557 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1558 	}
1559 
1560 	spin_unlock(&dev->dev_reservation_lock);
1561 	return len;
1562 }
1563 
1564 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1565 {
1566 	struct se_device *dev = pr_to_dev(item);
1567 
1568 	if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1569 		return sprintf(page, "SPC_PASSTHROUGH\n");
1570 	else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1571 		return sprintf(page, "SPC2_RESERVATIONS\n");
1572 	else
1573 		return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1574 }
1575 
1576 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1577 		char *page)
1578 {
1579 	struct se_device *dev = pr_to_dev(item);
1580 
1581 	if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1582 		return 0;
1583 
1584 	return sprintf(page, "APTPL Bit Status: %s\n",
1585 		(dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1586 }
1587 
1588 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1589 		char *page)
1590 {
1591 	struct se_device *dev = pr_to_dev(item);
1592 
1593 	if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1594 		return 0;
1595 
1596 	return sprintf(page, "Ready to process PR APTPL metadata..\n");
1597 }
1598 
1599 enum {
1600 	Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1601 	Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1602 	Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1603 	Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1604 };
1605 
1606 static match_table_t tokens = {
1607 	{Opt_initiator_fabric, "initiator_fabric=%s"},
1608 	{Opt_initiator_node, "initiator_node=%s"},
1609 	{Opt_initiator_sid, "initiator_sid=%s"},
1610 	{Opt_sa_res_key, "sa_res_key=%s"},
1611 	{Opt_res_holder, "res_holder=%d"},
1612 	{Opt_res_type, "res_type=%d"},
1613 	{Opt_res_scope, "res_scope=%d"},
1614 	{Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1615 	{Opt_mapped_lun, "mapped_lun=%u"},
1616 	{Opt_target_fabric, "target_fabric=%s"},
1617 	{Opt_target_node, "target_node=%s"},
1618 	{Opt_tpgt, "tpgt=%d"},
1619 	{Opt_port_rtpi, "port_rtpi=%d"},
1620 	{Opt_target_lun, "target_lun=%u"},
1621 	{Opt_err, NULL}
1622 };
1623 
1624 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1625 		const char *page, size_t count)
1626 {
1627 	struct se_device *dev = pr_to_dev(item);
1628 	unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1629 	unsigned char *t_fabric = NULL, *t_port = NULL;
1630 	char *orig, *ptr, *opts;
1631 	substring_t args[MAX_OPT_ARGS];
1632 	unsigned long long tmp_ll;
1633 	u64 sa_res_key = 0;
1634 	u64 mapped_lun = 0, target_lun = 0;
1635 	int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1636 	u16 tpgt = 0;
1637 	u8 type = 0;
1638 
1639 	if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1640 		return count;
1641 	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1642 		return count;
1643 
1644 	if (dev->export_count) {
1645 		pr_debug("Unable to process APTPL metadata while"
1646 			" active fabric exports exist\n");
1647 		return -EINVAL;
1648 	}
1649 
1650 	opts = kstrdup(page, GFP_KERNEL);
1651 	if (!opts)
1652 		return -ENOMEM;
1653 
1654 	orig = opts;
1655 	while ((ptr = strsep(&opts, ",\n")) != NULL) {
1656 		if (!*ptr)
1657 			continue;
1658 
1659 		token = match_token(ptr, tokens, args);
1660 		switch (token) {
1661 		case Opt_initiator_fabric:
1662 			i_fabric = match_strdup(args);
1663 			if (!i_fabric) {
1664 				ret = -ENOMEM;
1665 				goto out;
1666 			}
1667 			break;
1668 		case Opt_initiator_node:
1669 			i_port = match_strdup(args);
1670 			if (!i_port) {
1671 				ret = -ENOMEM;
1672 				goto out;
1673 			}
1674 			if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1675 				pr_err("APTPL metadata initiator_node="
1676 					" exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1677 					PR_APTPL_MAX_IPORT_LEN);
1678 				ret = -EINVAL;
1679 				break;
1680 			}
1681 			break;
1682 		case Opt_initiator_sid:
1683 			isid = match_strdup(args);
1684 			if (!isid) {
1685 				ret = -ENOMEM;
1686 				goto out;
1687 			}
1688 			if (strlen(isid) >= PR_REG_ISID_LEN) {
1689 				pr_err("APTPL metadata initiator_isid"
1690 					"= exceeds PR_REG_ISID_LEN: %d\n",
1691 					PR_REG_ISID_LEN);
1692 				ret = -EINVAL;
1693 				break;
1694 			}
1695 			break;
1696 		case Opt_sa_res_key:
1697 			ret = match_u64(args,  &tmp_ll);
1698 			if (ret < 0) {
1699 				pr_err("kstrtoull() failed for sa_res_key=\n");
1700 				goto out;
1701 			}
1702 			sa_res_key = (u64)tmp_ll;
1703 			break;
1704 		/*
1705 		 * PR APTPL Metadata for Reservation
1706 		 */
1707 		case Opt_res_holder:
1708 			ret = match_int(args, &arg);
1709 			if (ret)
1710 				goto out;
1711 			res_holder = arg;
1712 			break;
1713 		case Opt_res_type:
1714 			ret = match_int(args, &arg);
1715 			if (ret)
1716 				goto out;
1717 			type = (u8)arg;
1718 			break;
1719 		case Opt_res_scope:
1720 			ret = match_int(args, &arg);
1721 			if (ret)
1722 				goto out;
1723 			break;
1724 		case Opt_res_all_tg_pt:
1725 			ret = match_int(args, &arg);
1726 			if (ret)
1727 				goto out;
1728 			all_tg_pt = (int)arg;
1729 			break;
1730 		case Opt_mapped_lun:
1731 			ret = match_u64(args, &tmp_ll);
1732 			if (ret)
1733 				goto out;
1734 			mapped_lun = (u64)tmp_ll;
1735 			break;
1736 		/*
1737 		 * PR APTPL Metadata for Target Port
1738 		 */
1739 		case Opt_target_fabric:
1740 			t_fabric = match_strdup(args);
1741 			if (!t_fabric) {
1742 				ret = -ENOMEM;
1743 				goto out;
1744 			}
1745 			break;
1746 		case Opt_target_node:
1747 			t_port = match_strdup(args);
1748 			if (!t_port) {
1749 				ret = -ENOMEM;
1750 				goto out;
1751 			}
1752 			if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1753 				pr_err("APTPL metadata target_node="
1754 					" exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1755 					PR_APTPL_MAX_TPORT_LEN);
1756 				ret = -EINVAL;
1757 				break;
1758 			}
1759 			break;
1760 		case Opt_tpgt:
1761 			ret = match_int(args, &arg);
1762 			if (ret)
1763 				goto out;
1764 			tpgt = (u16)arg;
1765 			break;
1766 		case Opt_port_rtpi:
1767 			ret = match_int(args, &arg);
1768 			if (ret)
1769 				goto out;
1770 			break;
1771 		case Opt_target_lun:
1772 			ret = match_u64(args, &tmp_ll);
1773 			if (ret)
1774 				goto out;
1775 			target_lun = (u64)tmp_ll;
1776 			break;
1777 		default:
1778 			break;
1779 		}
1780 	}
1781 
1782 	if (!i_port || !t_port || !sa_res_key) {
1783 		pr_err("Illegal parameters for APTPL registration\n");
1784 		ret = -EINVAL;
1785 		goto out;
1786 	}
1787 
1788 	if (res_holder && !(type)) {
1789 		pr_err("Illegal PR type: 0x%02x for reservation"
1790 				" holder\n", type);
1791 		ret = -EINVAL;
1792 		goto out;
1793 	}
1794 
1795 	ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
1796 			i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1797 			res_holder, all_tg_pt, type);
1798 out:
1799 	kfree(i_fabric);
1800 	kfree(i_port);
1801 	kfree(isid);
1802 	kfree(t_fabric);
1803 	kfree(t_port);
1804 	kfree(orig);
1805 	return (ret == 0) ? count : ret;
1806 }
1807 
1808 
1809 CONFIGFS_ATTR_RO(target_pr_, res_holder);
1810 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
1811 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
1812 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
1813 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
1814 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
1815 CONFIGFS_ATTR_RO(target_pr_, res_type);
1816 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
1817 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
1818 
1819 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1820 	&target_pr_attr_res_holder,
1821 	&target_pr_attr_res_pr_all_tgt_pts,
1822 	&target_pr_attr_res_pr_generation,
1823 	&target_pr_attr_res_pr_holder_tg_port,
1824 	&target_pr_attr_res_pr_registered_i_pts,
1825 	&target_pr_attr_res_pr_type,
1826 	&target_pr_attr_res_type,
1827 	&target_pr_attr_res_aptpl_active,
1828 	&target_pr_attr_res_aptpl_metadata,
1829 	NULL,
1830 };
1831 
1832 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
1833 
1834 /*  End functions for struct config_item_type tb_dev_pr_cit */
1835 
1836 /*  Start functions for struct config_item_type tb_dev_cit */
1837 
1838 static inline struct se_device *to_device(struct config_item *item)
1839 {
1840 	return container_of(to_config_group(item), struct se_device, dev_group);
1841 }
1842 
1843 static ssize_t target_dev_info_show(struct config_item *item, char *page)
1844 {
1845 	struct se_device *dev = to_device(item);
1846 	int bl = 0;
1847 	ssize_t read_bytes = 0;
1848 
1849 	transport_dump_dev_state(dev, page, &bl);
1850 	read_bytes += bl;
1851 	read_bytes += dev->transport->show_configfs_dev_params(dev,
1852 			page+read_bytes);
1853 	return read_bytes;
1854 }
1855 
1856 static ssize_t target_dev_control_store(struct config_item *item,
1857 		const char *page, size_t count)
1858 {
1859 	struct se_device *dev = to_device(item);
1860 
1861 	return dev->transport->set_configfs_dev_params(dev, page, count);
1862 }
1863 
1864 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
1865 {
1866 	struct se_device *dev = to_device(item);
1867 
1868 	if (!(dev->dev_flags & DF_USING_ALIAS))
1869 		return 0;
1870 
1871 	return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
1872 }
1873 
1874 static ssize_t target_dev_alias_store(struct config_item *item,
1875 		const char *page, size_t count)
1876 {
1877 	struct se_device *dev = to_device(item);
1878 	struct se_hba *hba = dev->se_hba;
1879 	ssize_t read_bytes;
1880 
1881 	if (count > (SE_DEV_ALIAS_LEN-1)) {
1882 		pr_err("alias count: %d exceeds"
1883 			" SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1884 			SE_DEV_ALIAS_LEN-1);
1885 		return -EINVAL;
1886 	}
1887 
1888 	read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
1889 	if (!read_bytes)
1890 		return -EINVAL;
1891 	if (dev->dev_alias[read_bytes - 1] == '\n')
1892 		dev->dev_alias[read_bytes - 1] = '\0';
1893 
1894 	dev->dev_flags |= DF_USING_ALIAS;
1895 
1896 	pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1897 		config_item_name(&hba->hba_group.cg_item),
1898 		config_item_name(&dev->dev_group.cg_item),
1899 		dev->dev_alias);
1900 
1901 	return read_bytes;
1902 }
1903 
1904 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
1905 {
1906 	struct se_device *dev = to_device(item);
1907 
1908 	if (!(dev->dev_flags & DF_USING_UDEV_PATH))
1909 		return 0;
1910 
1911 	return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
1912 }
1913 
1914 static ssize_t target_dev_udev_path_store(struct config_item *item,
1915 		const char *page, size_t count)
1916 {
1917 	struct se_device *dev = to_device(item);
1918 	struct se_hba *hba = dev->se_hba;
1919 	ssize_t read_bytes;
1920 
1921 	if (count > (SE_UDEV_PATH_LEN-1)) {
1922 		pr_err("udev_path count: %d exceeds"
1923 			" SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1924 			SE_UDEV_PATH_LEN-1);
1925 		return -EINVAL;
1926 	}
1927 
1928 	read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
1929 			"%s", page);
1930 	if (!read_bytes)
1931 		return -EINVAL;
1932 	if (dev->udev_path[read_bytes - 1] == '\n')
1933 		dev->udev_path[read_bytes - 1] = '\0';
1934 
1935 	dev->dev_flags |= DF_USING_UDEV_PATH;
1936 
1937 	pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1938 		config_item_name(&hba->hba_group.cg_item),
1939 		config_item_name(&dev->dev_group.cg_item),
1940 		dev->udev_path);
1941 
1942 	return read_bytes;
1943 }
1944 
1945 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
1946 {
1947 	struct se_device *dev = to_device(item);
1948 
1949 	return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
1950 }
1951 
1952 static ssize_t target_dev_enable_store(struct config_item *item,
1953 		const char *page, size_t count)
1954 {
1955 	struct se_device *dev = to_device(item);
1956 	char *ptr;
1957 	int ret;
1958 
1959 	ptr = strstr(page, "1");
1960 	if (!ptr) {
1961 		pr_err("For dev_enable ops, only valid value"
1962 				" is \"1\"\n");
1963 		return -EINVAL;
1964 	}
1965 
1966 	ret = target_configure_device(dev);
1967 	if (ret)
1968 		return ret;
1969 	return count;
1970 }
1971 
1972 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
1973 {
1974 	struct se_device *dev = to_device(item);
1975 	struct config_item *lu_ci;
1976 	struct t10_alua_lu_gp *lu_gp;
1977 	struct t10_alua_lu_gp_member *lu_gp_mem;
1978 	ssize_t len = 0;
1979 
1980 	lu_gp_mem = dev->dev_alua_lu_gp_mem;
1981 	if (!lu_gp_mem)
1982 		return 0;
1983 
1984 	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1985 	lu_gp = lu_gp_mem->lu_gp;
1986 	if (lu_gp) {
1987 		lu_ci = &lu_gp->lu_gp_group.cg_item;
1988 		len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1989 			config_item_name(lu_ci), lu_gp->lu_gp_id);
1990 	}
1991 	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1992 
1993 	return len;
1994 }
1995 
1996 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
1997 		const char *page, size_t count)
1998 {
1999 	struct se_device *dev = to_device(item);
2000 	struct se_hba *hba = dev->se_hba;
2001 	struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2002 	struct t10_alua_lu_gp_member *lu_gp_mem;
2003 	unsigned char buf[LU_GROUP_NAME_BUF];
2004 	int move = 0;
2005 
2006 	lu_gp_mem = dev->dev_alua_lu_gp_mem;
2007 	if (!lu_gp_mem)
2008 		return count;
2009 
2010 	if (count > LU_GROUP_NAME_BUF) {
2011 		pr_err("ALUA LU Group Alias too large!\n");
2012 		return -EINVAL;
2013 	}
2014 	memset(buf, 0, LU_GROUP_NAME_BUF);
2015 	memcpy(buf, page, count);
2016 	/*
2017 	 * Any ALUA logical unit alias besides "NULL" means we will be
2018 	 * making a new group association.
2019 	 */
2020 	if (strcmp(strstrip(buf), "NULL")) {
2021 		/*
2022 		 * core_alua_get_lu_gp_by_name() will increment reference to
2023 		 * struct t10_alua_lu_gp.  This reference is released with
2024 		 * core_alua_get_lu_gp_by_name below().
2025 		 */
2026 		lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2027 		if (!lu_gp_new)
2028 			return -ENODEV;
2029 	}
2030 
2031 	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2032 	lu_gp = lu_gp_mem->lu_gp;
2033 	if (lu_gp) {
2034 		/*
2035 		 * Clearing an existing lu_gp association, and replacing
2036 		 * with NULL
2037 		 */
2038 		if (!lu_gp_new) {
2039 			pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2040 				" from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2041 				" %hu\n",
2042 				config_item_name(&hba->hba_group.cg_item),
2043 				config_item_name(&dev->dev_group.cg_item),
2044 				config_item_name(&lu_gp->lu_gp_group.cg_item),
2045 				lu_gp->lu_gp_id);
2046 
2047 			__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2048 			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2049 
2050 			return count;
2051 		}
2052 		/*
2053 		 * Removing existing association of lu_gp_mem with lu_gp
2054 		 */
2055 		__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2056 		move = 1;
2057 	}
2058 	/*
2059 	 * Associate lu_gp_mem with lu_gp_new.
2060 	 */
2061 	__core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2062 	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2063 
2064 	pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2065 		" core/alua/lu_gps/%s, ID: %hu\n",
2066 		(move) ? "Moving" : "Adding",
2067 		config_item_name(&hba->hba_group.cg_item),
2068 		config_item_name(&dev->dev_group.cg_item),
2069 		config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2070 		lu_gp_new->lu_gp_id);
2071 
2072 	core_alua_put_lu_gp_from_name(lu_gp_new);
2073 	return count;
2074 }
2075 
2076 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2077 {
2078 	struct se_device *dev = to_device(item);
2079 	struct t10_alua_lba_map *map;
2080 	struct t10_alua_lba_map_member *mem;
2081 	char *b = page;
2082 	int bl = 0;
2083 	char state;
2084 
2085 	spin_lock(&dev->t10_alua.lba_map_lock);
2086 	if (!list_empty(&dev->t10_alua.lba_map_list))
2087 	    bl += sprintf(b + bl, "%u %u\n",
2088 			  dev->t10_alua.lba_map_segment_size,
2089 			  dev->t10_alua.lba_map_segment_multiplier);
2090 	list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2091 		bl += sprintf(b + bl, "%llu %llu",
2092 			      map->lba_map_first_lba, map->lba_map_last_lba);
2093 		list_for_each_entry(mem, &map->lba_map_mem_list,
2094 				    lba_map_mem_list) {
2095 			switch (mem->lba_map_mem_alua_state) {
2096 			case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2097 				state = 'O';
2098 				break;
2099 			case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2100 				state = 'A';
2101 				break;
2102 			case ALUA_ACCESS_STATE_STANDBY:
2103 				state = 'S';
2104 				break;
2105 			case ALUA_ACCESS_STATE_UNAVAILABLE:
2106 				state = 'U';
2107 				break;
2108 			default:
2109 				state = '.';
2110 				break;
2111 			}
2112 			bl += sprintf(b + bl, " %d:%c",
2113 				      mem->lba_map_mem_alua_pg_id, state);
2114 		}
2115 		bl += sprintf(b + bl, "\n");
2116 	}
2117 	spin_unlock(&dev->t10_alua.lba_map_lock);
2118 	return bl;
2119 }
2120 
2121 static ssize_t target_dev_lba_map_store(struct config_item *item,
2122 		const char *page, size_t count)
2123 {
2124 	struct se_device *dev = to_device(item);
2125 	struct t10_alua_lba_map *lba_map = NULL;
2126 	struct list_head lba_list;
2127 	char *map_entries, *orig, *ptr;
2128 	char state;
2129 	int pg_num = -1, pg;
2130 	int ret = 0, num = 0, pg_id, alua_state;
2131 	unsigned long start_lba = -1, end_lba = -1;
2132 	unsigned long segment_size = -1, segment_mult = -1;
2133 
2134 	orig = map_entries = kstrdup(page, GFP_KERNEL);
2135 	if (!map_entries)
2136 		return -ENOMEM;
2137 
2138 	INIT_LIST_HEAD(&lba_list);
2139 	while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2140 		if (!*ptr)
2141 			continue;
2142 
2143 		if (num == 0) {
2144 			if (sscanf(ptr, "%lu %lu\n",
2145 				   &segment_size, &segment_mult) != 2) {
2146 				pr_err("Invalid line %d\n", num);
2147 				ret = -EINVAL;
2148 				break;
2149 			}
2150 			num++;
2151 			continue;
2152 		}
2153 		if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2154 			pr_err("Invalid line %d\n", num);
2155 			ret = -EINVAL;
2156 			break;
2157 		}
2158 		ptr = strchr(ptr, ' ');
2159 		if (!ptr) {
2160 			pr_err("Invalid line %d, missing end lba\n", num);
2161 			ret = -EINVAL;
2162 			break;
2163 		}
2164 		ptr++;
2165 		ptr = strchr(ptr, ' ');
2166 		if (!ptr) {
2167 			pr_err("Invalid line %d, missing state definitions\n",
2168 			       num);
2169 			ret = -EINVAL;
2170 			break;
2171 		}
2172 		ptr++;
2173 		lba_map = core_alua_allocate_lba_map(&lba_list,
2174 						     start_lba, end_lba);
2175 		if (IS_ERR(lba_map)) {
2176 			ret = PTR_ERR(lba_map);
2177 			break;
2178 		}
2179 		pg = 0;
2180 		while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2181 			switch (state) {
2182 			case 'O':
2183 				alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2184 				break;
2185 			case 'A':
2186 				alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2187 				break;
2188 			case 'S':
2189 				alua_state = ALUA_ACCESS_STATE_STANDBY;
2190 				break;
2191 			case 'U':
2192 				alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2193 				break;
2194 			default:
2195 				pr_err("Invalid ALUA state '%c'\n", state);
2196 				ret = -EINVAL;
2197 				goto out;
2198 			}
2199 
2200 			ret = core_alua_allocate_lba_map_mem(lba_map,
2201 							     pg_id, alua_state);
2202 			if (ret) {
2203 				pr_err("Invalid target descriptor %d:%c "
2204 				       "at line %d\n",
2205 				       pg_id, state, num);
2206 				break;
2207 			}
2208 			pg++;
2209 			ptr = strchr(ptr, ' ');
2210 			if (ptr)
2211 				ptr++;
2212 			else
2213 				break;
2214 		}
2215 		if (pg_num == -1)
2216 		    pg_num = pg;
2217 		else if (pg != pg_num) {
2218 			pr_err("Only %d from %d port groups definitions "
2219 			       "at line %d\n", pg, pg_num, num);
2220 			ret = -EINVAL;
2221 			break;
2222 		}
2223 		num++;
2224 	}
2225 out:
2226 	if (ret) {
2227 		core_alua_free_lba_map(&lba_list);
2228 		count = ret;
2229 	} else
2230 		core_alua_set_lba_map(dev, &lba_list,
2231 				      segment_size, segment_mult);
2232 	kfree(orig);
2233 	return count;
2234 }
2235 
2236 CONFIGFS_ATTR_RO(target_dev_, info);
2237 CONFIGFS_ATTR_WO(target_dev_, control);
2238 CONFIGFS_ATTR(target_dev_, alias);
2239 CONFIGFS_ATTR(target_dev_, udev_path);
2240 CONFIGFS_ATTR(target_dev_, enable);
2241 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2242 CONFIGFS_ATTR(target_dev_, lba_map);
2243 
2244 static struct configfs_attribute *target_core_dev_attrs[] = {
2245 	&target_dev_attr_info,
2246 	&target_dev_attr_control,
2247 	&target_dev_attr_alias,
2248 	&target_dev_attr_udev_path,
2249 	&target_dev_attr_enable,
2250 	&target_dev_attr_alua_lu_gp,
2251 	&target_dev_attr_lba_map,
2252 	NULL,
2253 };
2254 
2255 static void target_core_dev_release(struct config_item *item)
2256 {
2257 	struct config_group *dev_cg = to_config_group(item);
2258 	struct se_device *dev =
2259 		container_of(dev_cg, struct se_device, dev_group);
2260 
2261 	target_free_device(dev);
2262 }
2263 
2264 /*
2265  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2266  * within target_fabric_port_link()
2267  */
2268 struct configfs_item_operations target_core_dev_item_ops = {
2269 	.release		= target_core_dev_release,
2270 };
2271 
2272 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2273 
2274 /* End functions for struct config_item_type tb_dev_cit */
2275 
2276 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2277 
2278 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2279 {
2280 	return container_of(to_config_group(item), struct t10_alua_lu_gp,
2281 			lu_gp_group);
2282 }
2283 
2284 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2285 {
2286 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2287 
2288 	if (!lu_gp->lu_gp_valid_id)
2289 		return 0;
2290 	return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2291 }
2292 
2293 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2294 		const char *page, size_t count)
2295 {
2296 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2297 	struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2298 	unsigned long lu_gp_id;
2299 	int ret;
2300 
2301 	ret = kstrtoul(page, 0, &lu_gp_id);
2302 	if (ret < 0) {
2303 		pr_err("kstrtoul() returned %d for"
2304 			" lu_gp_id\n", ret);
2305 		return ret;
2306 	}
2307 	if (lu_gp_id > 0x0000ffff) {
2308 		pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2309 			" 0x0000ffff\n", lu_gp_id);
2310 		return -EINVAL;
2311 	}
2312 
2313 	ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2314 	if (ret < 0)
2315 		return -EINVAL;
2316 
2317 	pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2318 		" Group: core/alua/lu_gps/%s to ID: %hu\n",
2319 		config_item_name(&alua_lu_gp_cg->cg_item),
2320 		lu_gp->lu_gp_id);
2321 
2322 	return count;
2323 }
2324 
2325 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2326 {
2327 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2328 	struct se_device *dev;
2329 	struct se_hba *hba;
2330 	struct t10_alua_lu_gp_member *lu_gp_mem;
2331 	ssize_t len = 0, cur_len;
2332 	unsigned char buf[LU_GROUP_NAME_BUF];
2333 
2334 	memset(buf, 0, LU_GROUP_NAME_BUF);
2335 
2336 	spin_lock(&lu_gp->lu_gp_lock);
2337 	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2338 		dev = lu_gp_mem->lu_gp_mem_dev;
2339 		hba = dev->se_hba;
2340 
2341 		cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2342 			config_item_name(&hba->hba_group.cg_item),
2343 			config_item_name(&dev->dev_group.cg_item));
2344 		cur_len++; /* Extra byte for NULL terminator */
2345 
2346 		if ((cur_len + len) > PAGE_SIZE) {
2347 			pr_warn("Ran out of lu_gp_show_attr"
2348 				"_members buffer\n");
2349 			break;
2350 		}
2351 		memcpy(page+len, buf, cur_len);
2352 		len += cur_len;
2353 	}
2354 	spin_unlock(&lu_gp->lu_gp_lock);
2355 
2356 	return len;
2357 }
2358 
2359 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2360 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2361 
2362 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2363 	&target_lu_gp_attr_lu_gp_id,
2364 	&target_lu_gp_attr_members,
2365 	NULL,
2366 };
2367 
2368 static void target_core_alua_lu_gp_release(struct config_item *item)
2369 {
2370 	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2371 			struct t10_alua_lu_gp, lu_gp_group);
2372 
2373 	core_alua_free_lu_gp(lu_gp);
2374 }
2375 
2376 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2377 	.release		= target_core_alua_lu_gp_release,
2378 };
2379 
2380 static const struct config_item_type target_core_alua_lu_gp_cit = {
2381 	.ct_item_ops		= &target_core_alua_lu_gp_ops,
2382 	.ct_attrs		= target_core_alua_lu_gp_attrs,
2383 	.ct_owner		= THIS_MODULE,
2384 };
2385 
2386 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2387 
2388 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2389 
2390 static struct config_group *target_core_alua_create_lu_gp(
2391 	struct config_group *group,
2392 	const char *name)
2393 {
2394 	struct t10_alua_lu_gp *lu_gp;
2395 	struct config_group *alua_lu_gp_cg = NULL;
2396 	struct config_item *alua_lu_gp_ci = NULL;
2397 
2398 	lu_gp = core_alua_allocate_lu_gp(name, 0);
2399 	if (IS_ERR(lu_gp))
2400 		return NULL;
2401 
2402 	alua_lu_gp_cg = &lu_gp->lu_gp_group;
2403 	alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2404 
2405 	config_group_init_type_name(alua_lu_gp_cg, name,
2406 			&target_core_alua_lu_gp_cit);
2407 
2408 	pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2409 		" Group: core/alua/lu_gps/%s\n",
2410 		config_item_name(alua_lu_gp_ci));
2411 
2412 	return alua_lu_gp_cg;
2413 
2414 }
2415 
2416 static void target_core_alua_drop_lu_gp(
2417 	struct config_group *group,
2418 	struct config_item *item)
2419 {
2420 	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2421 			struct t10_alua_lu_gp, lu_gp_group);
2422 
2423 	pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2424 		" Group: core/alua/lu_gps/%s, ID: %hu\n",
2425 		config_item_name(item), lu_gp->lu_gp_id);
2426 	/*
2427 	 * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2428 	 * -> target_core_alua_lu_gp_release()
2429 	 */
2430 	config_item_put(item);
2431 }
2432 
2433 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2434 	.make_group		= &target_core_alua_create_lu_gp,
2435 	.drop_item		= &target_core_alua_drop_lu_gp,
2436 };
2437 
2438 static const struct config_item_type target_core_alua_lu_gps_cit = {
2439 	.ct_item_ops		= NULL,
2440 	.ct_group_ops		= &target_core_alua_lu_gps_group_ops,
2441 	.ct_owner		= THIS_MODULE,
2442 };
2443 
2444 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2445 
2446 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2447 
2448 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2449 {
2450 	return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2451 			tg_pt_gp_group);
2452 }
2453 
2454 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2455 		char *page)
2456 {
2457 	return sprintf(page, "%d\n",
2458 		       to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2459 }
2460 
2461 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2462 		const char *page, size_t count)
2463 {
2464 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2465 	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2466 	unsigned long tmp;
2467 	int new_state, ret;
2468 
2469 	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2470 		pr_err("Unable to do implicit ALUA on non valid"
2471 			" tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2472 		return -EINVAL;
2473 	}
2474 	if (!(dev->dev_flags & DF_CONFIGURED)) {
2475 		pr_err("Unable to set alua_access_state while device is"
2476 		       " not configured\n");
2477 		return -ENODEV;
2478 	}
2479 
2480 	ret = kstrtoul(page, 0, &tmp);
2481 	if (ret < 0) {
2482 		pr_err("Unable to extract new ALUA access state from"
2483 				" %s\n", page);
2484 		return ret;
2485 	}
2486 	new_state = (int)tmp;
2487 
2488 	if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2489 		pr_err("Unable to process implicit configfs ALUA"
2490 			" transition while TPGS_IMPLICIT_ALUA is disabled\n");
2491 		return -EINVAL;
2492 	}
2493 	if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2494 	    new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2495 		/* LBA DEPENDENT is only allowed with implicit ALUA */
2496 		pr_err("Unable to process implicit configfs ALUA transition"
2497 		       " while explicit ALUA management is enabled\n");
2498 		return -EINVAL;
2499 	}
2500 
2501 	ret = core_alua_do_port_transition(tg_pt_gp, dev,
2502 					NULL, NULL, new_state, 0);
2503 	return (!ret) ? count : -EINVAL;
2504 }
2505 
2506 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2507 		char *page)
2508 {
2509 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2510 	return sprintf(page, "%s\n",
2511 		core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2512 }
2513 
2514 static ssize_t target_tg_pt_gp_alua_access_status_store(
2515 		struct config_item *item, const char *page, size_t count)
2516 {
2517 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2518 	unsigned long tmp;
2519 	int new_status, ret;
2520 
2521 	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2522 		pr_err("Unable to do set ALUA access status on non"
2523 			" valid tg_pt_gp ID: %hu\n",
2524 			tg_pt_gp->tg_pt_gp_valid_id);
2525 		return -EINVAL;
2526 	}
2527 
2528 	ret = kstrtoul(page, 0, &tmp);
2529 	if (ret < 0) {
2530 		pr_err("Unable to extract new ALUA access status"
2531 				" from %s\n", page);
2532 		return ret;
2533 	}
2534 	new_status = (int)tmp;
2535 
2536 	if ((new_status != ALUA_STATUS_NONE) &&
2537 	    (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2538 	    (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2539 		pr_err("Illegal ALUA access status: 0x%02x\n",
2540 				new_status);
2541 		return -EINVAL;
2542 	}
2543 
2544 	tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2545 	return count;
2546 }
2547 
2548 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2549 		char *page)
2550 {
2551 	return core_alua_show_access_type(to_tg_pt_gp(item), page);
2552 }
2553 
2554 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2555 		const char *page, size_t count)
2556 {
2557 	return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2558 }
2559 
2560 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)				\
2561 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(		\
2562 		struct config_item *item, char *p)			\
2563 {									\
2564 	struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);		\
2565 	return sprintf(p, "%d\n",					\
2566 		!!(t->tg_pt_gp_alua_supported_states & _bit));		\
2567 }									\
2568 									\
2569 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(		\
2570 		struct config_item *item, const char *p, size_t c)	\
2571 {									\
2572 	struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);		\
2573 	unsigned long tmp;						\
2574 	int ret;							\
2575 									\
2576 	if (!t->tg_pt_gp_valid_id) {					\
2577 		pr_err("Unable to do set " #_name " ALUA state on non"	\
2578 		       " valid tg_pt_gp ID: %hu\n",			\
2579 		       t->tg_pt_gp_valid_id);				\
2580 		return -EINVAL;						\
2581 	}								\
2582 									\
2583 	ret = kstrtoul(p, 0, &tmp);					\
2584 	if (ret < 0) {							\
2585 		pr_err("Invalid value '%s', must be '0' or '1'\n", p);	\
2586 		return -EINVAL;						\
2587 	}								\
2588 	if (tmp > 1) {							\
2589 		pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2590 		return -EINVAL;						\
2591 	}								\
2592 	if (tmp)							\
2593 		t->tg_pt_gp_alua_supported_states |= _bit;		\
2594 	else								\
2595 		t->tg_pt_gp_alua_supported_states &= ~_bit;		\
2596 									\
2597 	return c;							\
2598 }
2599 
2600 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2601 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2602 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2603 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2604 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2605 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2606 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2607 
2608 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2609 		struct config_item *item, char *page)
2610 {
2611 	return sprintf(page, "%d\n",
2612 		to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2613 }
2614 
2615 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2616 		struct config_item *item, const char *page, size_t count)
2617 {
2618 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2619 	unsigned long tmp;
2620 	int ret;
2621 
2622 	ret = kstrtoul(page, 0, &tmp);
2623 	if (ret < 0) {
2624 		pr_err("Unable to extract alua_write_metadata\n");
2625 		return ret;
2626 	}
2627 
2628 	if ((tmp != 0) && (tmp != 1)) {
2629 		pr_err("Illegal value for alua_write_metadata:"
2630 			" %lu\n", tmp);
2631 		return -EINVAL;
2632 	}
2633 	tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2634 
2635 	return count;
2636 }
2637 
2638 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2639 		char *page)
2640 {
2641 	return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2642 }
2643 
2644 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2645 		const char *page, size_t count)
2646 {
2647 	return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2648 			count);
2649 }
2650 
2651 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2652 		char *page)
2653 {
2654 	return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2655 }
2656 
2657 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
2658 		const char *page, size_t count)
2659 {
2660 	return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
2661 			count);
2662 }
2663 
2664 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
2665 		struct config_item *item, char *page)
2666 {
2667 	return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
2668 }
2669 
2670 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
2671 		struct config_item *item, const char *page, size_t count)
2672 {
2673 	return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
2674 			count);
2675 }
2676 
2677 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
2678 		char *page)
2679 {
2680 	return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
2681 }
2682 
2683 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
2684 		const char *page, size_t count)
2685 {
2686 	return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
2687 }
2688 
2689 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
2690 		char *page)
2691 {
2692 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2693 
2694 	if (!tg_pt_gp->tg_pt_gp_valid_id)
2695 		return 0;
2696 	return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2697 }
2698 
2699 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
2700 		const char *page, size_t count)
2701 {
2702 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2703 	struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2704 	unsigned long tg_pt_gp_id;
2705 	int ret;
2706 
2707 	ret = kstrtoul(page, 0, &tg_pt_gp_id);
2708 	if (ret < 0) {
2709 		pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
2710 		       page);
2711 		return ret;
2712 	}
2713 	if (tg_pt_gp_id > 0x0000ffff) {
2714 		pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
2715 		       tg_pt_gp_id);
2716 		return -EINVAL;
2717 	}
2718 
2719 	ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2720 	if (ret < 0)
2721 		return -EINVAL;
2722 
2723 	pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2724 		"core/alua/tg_pt_gps/%s to ID: %hu\n",
2725 		config_item_name(&alua_tg_pt_gp_cg->cg_item),
2726 		tg_pt_gp->tg_pt_gp_id);
2727 
2728 	return count;
2729 }
2730 
2731 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
2732 		char *page)
2733 {
2734 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2735 	struct se_lun *lun;
2736 	ssize_t len = 0, cur_len;
2737 	unsigned char buf[TG_PT_GROUP_NAME_BUF];
2738 
2739 	memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2740 
2741 	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2742 	list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
2743 			lun_tg_pt_gp_link) {
2744 		struct se_portal_group *tpg = lun->lun_tpg;
2745 
2746 		cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2747 			"/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2748 			tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2749 			tpg->se_tpg_tfo->tpg_get_tag(tpg),
2750 			config_item_name(&lun->lun_group.cg_item));
2751 		cur_len++; /* Extra byte for NULL terminator */
2752 
2753 		if ((cur_len + len) > PAGE_SIZE) {
2754 			pr_warn("Ran out of lu_gp_show_attr"
2755 				"_members buffer\n");
2756 			break;
2757 		}
2758 		memcpy(page+len, buf, cur_len);
2759 		len += cur_len;
2760 	}
2761 	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2762 
2763 	return len;
2764 }
2765 
2766 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
2767 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
2768 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
2769 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
2770 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
2771 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
2772 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
2773 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
2774 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
2775 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
2776 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
2777 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
2778 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
2779 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
2780 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
2781 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
2782 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
2783 
2784 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2785 	&target_tg_pt_gp_attr_alua_access_state,
2786 	&target_tg_pt_gp_attr_alua_access_status,
2787 	&target_tg_pt_gp_attr_alua_access_type,
2788 	&target_tg_pt_gp_attr_alua_support_transitioning,
2789 	&target_tg_pt_gp_attr_alua_support_offline,
2790 	&target_tg_pt_gp_attr_alua_support_lba_dependent,
2791 	&target_tg_pt_gp_attr_alua_support_unavailable,
2792 	&target_tg_pt_gp_attr_alua_support_standby,
2793 	&target_tg_pt_gp_attr_alua_support_active_nonoptimized,
2794 	&target_tg_pt_gp_attr_alua_support_active_optimized,
2795 	&target_tg_pt_gp_attr_alua_write_metadata,
2796 	&target_tg_pt_gp_attr_nonop_delay_msecs,
2797 	&target_tg_pt_gp_attr_trans_delay_msecs,
2798 	&target_tg_pt_gp_attr_implicit_trans_secs,
2799 	&target_tg_pt_gp_attr_preferred,
2800 	&target_tg_pt_gp_attr_tg_pt_gp_id,
2801 	&target_tg_pt_gp_attr_members,
2802 	NULL,
2803 };
2804 
2805 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2806 {
2807 	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2808 			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2809 
2810 	core_alua_free_tg_pt_gp(tg_pt_gp);
2811 }
2812 
2813 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2814 	.release		= target_core_alua_tg_pt_gp_release,
2815 };
2816 
2817 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
2818 	.ct_item_ops		= &target_core_alua_tg_pt_gp_ops,
2819 	.ct_attrs		= target_core_alua_tg_pt_gp_attrs,
2820 	.ct_owner		= THIS_MODULE,
2821 };
2822 
2823 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2824 
2825 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2826 
2827 static struct config_group *target_core_alua_create_tg_pt_gp(
2828 	struct config_group *group,
2829 	const char *name)
2830 {
2831 	struct t10_alua *alua = container_of(group, struct t10_alua,
2832 					alua_tg_pt_gps_group);
2833 	struct t10_alua_tg_pt_gp *tg_pt_gp;
2834 	struct config_group *alua_tg_pt_gp_cg = NULL;
2835 	struct config_item *alua_tg_pt_gp_ci = NULL;
2836 
2837 	tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
2838 	if (!tg_pt_gp)
2839 		return NULL;
2840 
2841 	alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2842 	alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2843 
2844 	config_group_init_type_name(alua_tg_pt_gp_cg, name,
2845 			&target_core_alua_tg_pt_gp_cit);
2846 
2847 	pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2848 		" Group: alua/tg_pt_gps/%s\n",
2849 		config_item_name(alua_tg_pt_gp_ci));
2850 
2851 	return alua_tg_pt_gp_cg;
2852 }
2853 
2854 static void target_core_alua_drop_tg_pt_gp(
2855 	struct config_group *group,
2856 	struct config_item *item)
2857 {
2858 	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2859 			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2860 
2861 	pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2862 		" Group: alua/tg_pt_gps/%s, ID: %hu\n",
2863 		config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2864 	/*
2865 	 * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2866 	 * -> target_core_alua_tg_pt_gp_release().
2867 	 */
2868 	config_item_put(item);
2869 }
2870 
2871 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2872 	.make_group		= &target_core_alua_create_tg_pt_gp,
2873 	.drop_item		= &target_core_alua_drop_tg_pt_gp,
2874 };
2875 
2876 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
2877 
2878 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2879 
2880 /* Start functions for struct config_item_type target_core_alua_cit */
2881 
2882 /*
2883  * target_core_alua_cit is a ConfigFS group that lives under
2884  * /sys/kernel/config/target/core/alua.  There are default groups
2885  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2886  * target_core_alua_cit in target_core_init_configfs() below.
2887  */
2888 static const struct config_item_type target_core_alua_cit = {
2889 	.ct_item_ops		= NULL,
2890 	.ct_attrs		= NULL,
2891 	.ct_owner		= THIS_MODULE,
2892 };
2893 
2894 /* End functions for struct config_item_type target_core_alua_cit */
2895 
2896 /* Start functions for struct config_item_type tb_dev_stat_cit */
2897 
2898 static struct config_group *target_core_stat_mkdir(
2899 	struct config_group *group,
2900 	const char *name)
2901 {
2902 	return ERR_PTR(-ENOSYS);
2903 }
2904 
2905 static void target_core_stat_rmdir(
2906 	struct config_group *group,
2907 	struct config_item *item)
2908 {
2909 	return;
2910 }
2911 
2912 static struct configfs_group_operations target_core_stat_group_ops = {
2913 	.make_group		= &target_core_stat_mkdir,
2914 	.drop_item		= &target_core_stat_rmdir,
2915 };
2916 
2917 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
2918 
2919 /* End functions for struct config_item_type tb_dev_stat_cit */
2920 
2921 /* Start functions for struct config_item_type target_core_hba_cit */
2922 
2923 static struct config_group *target_core_make_subdev(
2924 	struct config_group *group,
2925 	const char *name)
2926 {
2927 	struct t10_alua_tg_pt_gp *tg_pt_gp;
2928 	struct config_item *hba_ci = &group->cg_item;
2929 	struct se_hba *hba = item_to_hba(hba_ci);
2930 	struct target_backend *tb = hba->backend;
2931 	struct se_device *dev;
2932 	int errno = -ENOMEM, ret;
2933 
2934 	ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2935 	if (ret)
2936 		return ERR_PTR(ret);
2937 
2938 	dev = target_alloc_device(hba, name);
2939 	if (!dev)
2940 		goto out_unlock;
2941 
2942 	config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
2943 
2944 	config_group_init_type_name(&dev->dev_action_group, "action",
2945 			&tb->tb_dev_action_cit);
2946 	configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
2947 
2948 	config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
2949 			&tb->tb_dev_attrib_cit);
2950 	configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
2951 
2952 	config_group_init_type_name(&dev->dev_pr_group, "pr",
2953 			&tb->tb_dev_pr_cit);
2954 	configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
2955 
2956 	config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
2957 			&tb->tb_dev_wwn_cit);
2958 	configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
2959 			&dev->dev_group);
2960 
2961 	config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
2962 			"alua", &tb->tb_dev_alua_tg_pt_gps_cit);
2963 	configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
2964 			&dev->dev_group);
2965 
2966 	config_group_init_type_name(&dev->dev_stat_grps.stat_group,
2967 			"statistics", &tb->tb_dev_stat_cit);
2968 	configfs_add_default_group(&dev->dev_stat_grps.stat_group,
2969 			&dev->dev_group);
2970 
2971 	/*
2972 	 * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2973 	 */
2974 	tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
2975 	if (!tg_pt_gp)
2976 		goto out_free_device;
2977 	dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2978 
2979 	config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2980 			"default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2981 	configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
2982 			&dev->t10_alua.alua_tg_pt_gps_group);
2983 
2984 	/*
2985 	 * Add core/$HBA/$DEV/statistics/ default groups
2986 	 */
2987 	target_stat_setup_dev_default_groups(dev);
2988 
2989 	mutex_unlock(&hba->hba_access_mutex);
2990 	return &dev->dev_group;
2991 
2992 out_free_device:
2993 	target_free_device(dev);
2994 out_unlock:
2995 	mutex_unlock(&hba->hba_access_mutex);
2996 	return ERR_PTR(errno);
2997 }
2998 
2999 static void target_core_drop_subdev(
3000 	struct config_group *group,
3001 	struct config_item *item)
3002 {
3003 	struct config_group *dev_cg = to_config_group(item);
3004 	struct se_device *dev =
3005 		container_of(dev_cg, struct se_device, dev_group);
3006 	struct se_hba *hba;
3007 
3008 	hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3009 
3010 	mutex_lock(&hba->hba_access_mutex);
3011 
3012 	configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3013 	configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3014 
3015 	/*
3016 	 * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3017 	 * directly from target_core_alua_tg_pt_gp_release().
3018 	 */
3019 	dev->t10_alua.default_tg_pt_gp = NULL;
3020 
3021 	configfs_remove_default_groups(dev_cg);
3022 
3023 	/*
3024 	 * se_dev is released from target_core_dev_item_ops->release()
3025 	 */
3026 	config_item_put(item);
3027 	mutex_unlock(&hba->hba_access_mutex);
3028 }
3029 
3030 static struct configfs_group_operations target_core_hba_group_ops = {
3031 	.make_group		= target_core_make_subdev,
3032 	.drop_item		= target_core_drop_subdev,
3033 };
3034 
3035 
3036 static inline struct se_hba *to_hba(struct config_item *item)
3037 {
3038 	return container_of(to_config_group(item), struct se_hba, hba_group);
3039 }
3040 
3041 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3042 {
3043 	struct se_hba *hba = to_hba(item);
3044 
3045 	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3046 			hba->hba_id, hba->backend->ops->name,
3047 			TARGET_CORE_VERSION);
3048 }
3049 
3050 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3051 {
3052 	struct se_hba *hba = to_hba(item);
3053 	int hba_mode = 0;
3054 
3055 	if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3056 		hba_mode = 1;
3057 
3058 	return sprintf(page, "%d\n", hba_mode);
3059 }
3060 
3061 static ssize_t target_hba_mode_store(struct config_item *item,
3062 		const char *page, size_t count)
3063 {
3064 	struct se_hba *hba = to_hba(item);
3065 	unsigned long mode_flag;
3066 	int ret;
3067 
3068 	if (hba->backend->ops->pmode_enable_hba == NULL)
3069 		return -EINVAL;
3070 
3071 	ret = kstrtoul(page, 0, &mode_flag);
3072 	if (ret < 0) {
3073 		pr_err("Unable to extract hba mode flag: %d\n", ret);
3074 		return ret;
3075 	}
3076 
3077 	if (hba->dev_count) {
3078 		pr_err("Unable to set hba_mode with active devices\n");
3079 		return -EINVAL;
3080 	}
3081 
3082 	ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3083 	if (ret < 0)
3084 		return -EINVAL;
3085 	if (ret > 0)
3086 		hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3087 	else if (ret == 0)
3088 		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3089 
3090 	return count;
3091 }
3092 
3093 CONFIGFS_ATTR_RO(target_, hba_info);
3094 CONFIGFS_ATTR(target_, hba_mode);
3095 
3096 static void target_core_hba_release(struct config_item *item)
3097 {
3098 	struct se_hba *hba = container_of(to_config_group(item),
3099 				struct se_hba, hba_group);
3100 	core_delete_hba(hba);
3101 }
3102 
3103 static struct configfs_attribute *target_core_hba_attrs[] = {
3104 	&target_attr_hba_info,
3105 	&target_attr_hba_mode,
3106 	NULL,
3107 };
3108 
3109 static struct configfs_item_operations target_core_hba_item_ops = {
3110 	.release		= target_core_hba_release,
3111 };
3112 
3113 static const struct config_item_type target_core_hba_cit = {
3114 	.ct_item_ops		= &target_core_hba_item_ops,
3115 	.ct_group_ops		= &target_core_hba_group_ops,
3116 	.ct_attrs		= target_core_hba_attrs,
3117 	.ct_owner		= THIS_MODULE,
3118 };
3119 
3120 static struct config_group *target_core_call_addhbatotarget(
3121 	struct config_group *group,
3122 	const char *name)
3123 {
3124 	char *se_plugin_str, *str, *str2;
3125 	struct se_hba *hba;
3126 	char buf[TARGET_CORE_NAME_MAX_LEN];
3127 	unsigned long plugin_dep_id = 0;
3128 	int ret;
3129 
3130 	memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3131 	if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3132 		pr_err("Passed *name strlen(): %d exceeds"
3133 			" TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3134 			TARGET_CORE_NAME_MAX_LEN);
3135 		return ERR_PTR(-ENAMETOOLONG);
3136 	}
3137 	snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3138 
3139 	str = strstr(buf, "_");
3140 	if (!str) {
3141 		pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3142 		return ERR_PTR(-EINVAL);
3143 	}
3144 	se_plugin_str = buf;
3145 	/*
3146 	 * Special case for subsystem plugins that have "_" in their names.
3147 	 * Namely rd_direct and rd_mcp..
3148 	 */
3149 	str2 = strstr(str+1, "_");
3150 	if (str2) {
3151 		*str2 = '\0'; /* Terminate for *se_plugin_str */
3152 		str2++; /* Skip to start of plugin dependent ID */
3153 		str = str2;
3154 	} else {
3155 		*str = '\0'; /* Terminate for *se_plugin_str */
3156 		str++; /* Skip to start of plugin dependent ID */
3157 	}
3158 
3159 	ret = kstrtoul(str, 0, &plugin_dep_id);
3160 	if (ret < 0) {
3161 		pr_err("kstrtoul() returned %d for"
3162 				" plugin_dep_id\n", ret);
3163 		return ERR_PTR(ret);
3164 	}
3165 	/*
3166 	 * Load up TCM subsystem plugins if they have not already been loaded.
3167 	 */
3168 	transport_subsystem_check_init();
3169 
3170 	hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3171 	if (IS_ERR(hba))
3172 		return ERR_CAST(hba);
3173 
3174 	config_group_init_type_name(&hba->hba_group, name,
3175 			&target_core_hba_cit);
3176 
3177 	return &hba->hba_group;
3178 }
3179 
3180 static void target_core_call_delhbafromtarget(
3181 	struct config_group *group,
3182 	struct config_item *item)
3183 {
3184 	/*
3185 	 * core_delete_hba() is called from target_core_hba_item_ops->release()
3186 	 * -> target_core_hba_release()
3187 	 */
3188 	config_item_put(item);
3189 }
3190 
3191 static struct configfs_group_operations target_core_group_ops = {
3192 	.make_group	= target_core_call_addhbatotarget,
3193 	.drop_item	= target_core_call_delhbafromtarget,
3194 };
3195 
3196 static const struct config_item_type target_core_cit = {
3197 	.ct_item_ops	= NULL,
3198 	.ct_group_ops	= &target_core_group_ops,
3199 	.ct_attrs	= NULL,
3200 	.ct_owner	= THIS_MODULE,
3201 };
3202 
3203 /* Stop functions for struct config_item_type target_core_hba_cit */
3204 
3205 void target_setup_backend_cits(struct target_backend *tb)
3206 {
3207 	target_core_setup_dev_cit(tb);
3208 	target_core_setup_dev_action_cit(tb);
3209 	target_core_setup_dev_attrib_cit(tb);
3210 	target_core_setup_dev_pr_cit(tb);
3211 	target_core_setup_dev_wwn_cit(tb);
3212 	target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3213 	target_core_setup_dev_stat_cit(tb);
3214 }
3215 
3216 static int __init target_core_init_configfs(void)
3217 {
3218 	struct configfs_subsystem *subsys = &target_core_fabrics;
3219 	struct t10_alua_lu_gp *lu_gp;
3220 	int ret;
3221 
3222 	pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3223 		" Engine: %s on %s/%s on "UTS_RELEASE"\n",
3224 		TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3225 
3226 	config_group_init(&subsys->su_group);
3227 	mutex_init(&subsys->su_mutex);
3228 
3229 	ret = init_se_kmem_caches();
3230 	if (ret < 0)
3231 		return ret;
3232 	/*
3233 	 * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3234 	 * and ALUA Logical Unit Group and Target Port Group infrastructure.
3235 	 */
3236 	config_group_init_type_name(&target_core_hbagroup, "core",
3237 			&target_core_cit);
3238 	configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3239 
3240 	/*
3241 	 * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3242 	 */
3243 	config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3244 	configfs_add_default_group(&alua_group, &target_core_hbagroup);
3245 
3246 	/*
3247 	 * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3248 	 * groups under /sys/kernel/config/target/core/alua/
3249 	 */
3250 	config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3251 			&target_core_alua_lu_gps_cit);
3252 	configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3253 
3254 	/*
3255 	 * Add core/alua/lu_gps/default_lu_gp
3256 	 */
3257 	lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3258 	if (IS_ERR(lu_gp)) {
3259 		ret = -ENOMEM;
3260 		goto out_global;
3261 	}
3262 
3263 	config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3264 				&target_core_alua_lu_gp_cit);
3265 	configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3266 
3267 	default_lu_gp = lu_gp;
3268 
3269 	/*
3270 	 * Register the target_core_mod subsystem with configfs.
3271 	 */
3272 	ret = configfs_register_subsystem(subsys);
3273 	if (ret < 0) {
3274 		pr_err("Error %d while registering subsystem %s\n",
3275 			ret, subsys->su_group.cg_item.ci_namebuf);
3276 		goto out_global;
3277 	}
3278 	pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3279 		" Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3280 		" on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3281 	/*
3282 	 * Register built-in RAMDISK subsystem logic for virtual LUN 0
3283 	 */
3284 	ret = rd_module_init();
3285 	if (ret < 0)
3286 		goto out;
3287 
3288 	ret = core_dev_setup_virtual_lun0();
3289 	if (ret < 0)
3290 		goto out;
3291 
3292 	ret = target_xcopy_setup_pt();
3293 	if (ret < 0)
3294 		goto out;
3295 
3296 	return 0;
3297 
3298 out:
3299 	configfs_unregister_subsystem(subsys);
3300 	core_dev_release_virtual_lun0();
3301 	rd_module_exit();
3302 out_global:
3303 	if (default_lu_gp) {
3304 		core_alua_free_lu_gp(default_lu_gp);
3305 		default_lu_gp = NULL;
3306 	}
3307 	release_se_kmem_caches();
3308 	return ret;
3309 }
3310 
3311 static void __exit target_core_exit_configfs(void)
3312 {
3313 	configfs_remove_default_groups(&alua_lu_gps_group);
3314 	configfs_remove_default_groups(&alua_group);
3315 	configfs_remove_default_groups(&target_core_hbagroup);
3316 
3317 	/*
3318 	 * We expect subsys->su_group.default_groups to be released
3319 	 * by configfs subsystem provider logic..
3320 	 */
3321 	configfs_unregister_subsystem(&target_core_fabrics);
3322 
3323 	core_alua_free_lu_gp(default_lu_gp);
3324 	default_lu_gp = NULL;
3325 
3326 	pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3327 			" Infrastructure\n");
3328 
3329 	core_dev_release_virtual_lun0();
3330 	rd_module_exit();
3331 	target_xcopy_release_pt();
3332 	release_se_kmem_caches();
3333 }
3334 
3335 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3336 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3337 MODULE_LICENSE("GPL");
3338 
3339 module_init(target_core_init_configfs);
3340 module_exit(target_core_exit_configfs);
3341