1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3  * Filename:  target_core_configfs.c
4  *
5  * This file contains ConfigFS logic for the Generic Target Engine project.
6  *
7  * (c) Copyright 2008-2013 Datera, Inc.
8  *
9  * Nicholas A. Bellinger <nab@kernel.org>
10  *
11  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
12  *
13  ****************************************************************************/
14 
15 #include <linux/kstrtox.h>
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <generated/utsrelease.h>
19 #include <linux/utsname.h>
20 #include <linux/init.h>
21 #include <linux/fs.h>
22 #include <linux/namei.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
25 #include <linux/delay.h>
26 #include <linux/unistd.h>
27 #include <linux/string.h>
28 #include <linux/parser.h>
29 #include <linux/syscalls.h>
30 #include <linux/configfs.h>
31 #include <linux/spinlock.h>
32 
33 #include <target/target_core_base.h>
34 #include <target/target_core_backend.h>
35 #include <target/target_core_fabric.h>
36 
37 #include "target_core_internal.h"
38 #include "target_core_alua.h"
39 #include "target_core_pr.h"
40 #include "target_core_rd.h"
41 #include "target_core_xcopy.h"
42 
43 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)		\
44 static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
45 {									\
46 	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
47 									\
48 	cit->ct_item_ops = _item_ops;					\
49 	cit->ct_group_ops = _group_ops;					\
50 	cit->ct_attrs = _attrs;						\
51 	cit->ct_owner = tb->ops->owner;					\
52 	pr_debug("Setup generic %s\n", __stringify(_name));		\
53 }
54 
55 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)			\
56 static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
57 {									\
58 	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
59 									\
60 	cit->ct_item_ops = _item_ops;					\
61 	cit->ct_group_ops = _group_ops;					\
62 	cit->ct_attrs = tb->ops->tb_##_name##_attrs;			\
63 	cit->ct_owner = tb->ops->owner;					\
64 	pr_debug("Setup generic %s\n", __stringify(_name));		\
65 }
66 
67 extern struct t10_alua_lu_gp *default_lu_gp;
68 
69 static LIST_HEAD(g_tf_list);
70 static DEFINE_MUTEX(g_tf_lock);
71 
72 static struct config_group target_core_hbagroup;
73 static struct config_group alua_group;
74 static struct config_group alua_lu_gps_group;
75 
76 static unsigned int target_devices;
77 static DEFINE_MUTEX(target_devices_lock);
78 
79 static inline struct se_hba *
80 item_to_hba(struct config_item *item)
81 {
82 	return container_of(to_config_group(item), struct se_hba, hba_group);
83 }
84 
85 /*
86  * Attributes for /sys/kernel/config/target/
87  */
88 static ssize_t target_core_item_version_show(struct config_item *item,
89 		char *page)
90 {
91 	return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
92 		" on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
93 		utsname()->sysname, utsname()->machine);
94 }
95 
96 CONFIGFS_ATTR_RO(target_core_item_, version);
97 
98 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
99 static char db_root_stage[DB_ROOT_LEN];
100 
101 static ssize_t target_core_item_dbroot_show(struct config_item *item,
102 					    char *page)
103 {
104 	return sprintf(page, "%s\n", db_root);
105 }
106 
107 static ssize_t target_core_item_dbroot_store(struct config_item *item,
108 					const char *page, size_t count)
109 {
110 	ssize_t read_bytes;
111 	struct file *fp;
112 	ssize_t r = -EINVAL;
113 
114 	mutex_lock(&target_devices_lock);
115 	if (target_devices) {
116 		pr_err("db_root: cannot be changed because it's in use\n");
117 		goto unlock;
118 	}
119 
120 	if (count > (DB_ROOT_LEN - 1)) {
121 		pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
122 		       (int)count, DB_ROOT_LEN - 1);
123 		goto unlock;
124 	}
125 
126 	read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
127 	if (!read_bytes)
128 		goto unlock;
129 
130 	if (db_root_stage[read_bytes - 1] == '\n')
131 		db_root_stage[read_bytes - 1] = '\0';
132 
133 	/* validate new db root before accepting it */
134 	fp = filp_open(db_root_stage, O_RDONLY, 0);
135 	if (IS_ERR(fp)) {
136 		pr_err("db_root: cannot open: %s\n", db_root_stage);
137 		goto unlock;
138 	}
139 	if (!S_ISDIR(file_inode(fp)->i_mode)) {
140 		filp_close(fp, NULL);
141 		pr_err("db_root: not a directory: %s\n", db_root_stage);
142 		goto unlock;
143 	}
144 	filp_close(fp, NULL);
145 
146 	strncpy(db_root, db_root_stage, read_bytes);
147 	pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
148 
149 	r = read_bytes;
150 
151 unlock:
152 	mutex_unlock(&target_devices_lock);
153 	return r;
154 }
155 
156 CONFIGFS_ATTR(target_core_item_, dbroot);
157 
158 static struct target_fabric_configfs *target_core_get_fabric(
159 	const char *name)
160 {
161 	struct target_fabric_configfs *tf;
162 
163 	if (!name)
164 		return NULL;
165 
166 	mutex_lock(&g_tf_lock);
167 	list_for_each_entry(tf, &g_tf_list, tf_list) {
168 		const char *cmp_name = tf->tf_ops->fabric_alias;
169 		if (!cmp_name)
170 			cmp_name = tf->tf_ops->fabric_name;
171 		if (!strcmp(cmp_name, name)) {
172 			atomic_inc(&tf->tf_access_cnt);
173 			mutex_unlock(&g_tf_lock);
174 			return tf;
175 		}
176 	}
177 	mutex_unlock(&g_tf_lock);
178 
179 	return NULL;
180 }
181 
182 /*
183  * Called from struct target_core_group_ops->make_group()
184  */
185 static struct config_group *target_core_register_fabric(
186 	struct config_group *group,
187 	const char *name)
188 {
189 	struct target_fabric_configfs *tf;
190 	int ret;
191 
192 	pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
193 			" %s\n", group, name);
194 
195 	tf = target_core_get_fabric(name);
196 	if (!tf) {
197 		pr_debug("target_core_register_fabric() trying autoload for %s\n",
198 			 name);
199 
200 		/*
201 		 * Below are some hardcoded request_module() calls to automatically
202 		 * local fabric modules when the following is called:
203 		 *
204 		 * mkdir -p /sys/kernel/config/target/$MODULE_NAME
205 		 *
206 		 * Note that this does not limit which TCM fabric module can be
207 		 * registered, but simply provids auto loading logic for modules with
208 		 * mkdir(2) system calls with known TCM fabric modules.
209 		 */
210 
211 		if (!strncmp(name, "iscsi", 5)) {
212 			/*
213 			 * Automatically load the LIO Target fabric module when the
214 			 * following is called:
215 			 *
216 			 * mkdir -p $CONFIGFS/target/iscsi
217 			 */
218 			ret = request_module("iscsi_target_mod");
219 			if (ret < 0) {
220 				pr_debug("request_module() failed for"
221 				         " iscsi_target_mod.ko: %d\n", ret);
222 				return ERR_PTR(-EINVAL);
223 			}
224 		} else if (!strncmp(name, "loopback", 8)) {
225 			/*
226 			 * Automatically load the tcm_loop fabric module when the
227 			 * following is called:
228 			 *
229 			 * mkdir -p $CONFIGFS/target/loopback
230 			 */
231 			ret = request_module("tcm_loop");
232 			if (ret < 0) {
233 				pr_debug("request_module() failed for"
234 				         " tcm_loop.ko: %d\n", ret);
235 				return ERR_PTR(-EINVAL);
236 			}
237 		}
238 
239 		tf = target_core_get_fabric(name);
240 	}
241 
242 	if (!tf) {
243 		pr_debug("target_core_get_fabric() failed for %s\n",
244 		         name);
245 		return ERR_PTR(-EINVAL);
246 	}
247 	pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
248 			" %s\n", tf->tf_ops->fabric_name);
249 	/*
250 	 * On a successful target_core_get_fabric() look, the returned
251 	 * struct target_fabric_configfs *tf will contain a usage reference.
252 	 */
253 	pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
254 			&tf->tf_wwn_cit);
255 
256 	config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
257 
258 	config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
259 			&tf->tf_discovery_cit);
260 	configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
261 
262 	pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric: %s\n",
263 		 config_item_name(&tf->tf_group.cg_item));
264 	return &tf->tf_group;
265 }
266 
267 /*
268  * Called from struct target_core_group_ops->drop_item()
269  */
270 static void target_core_deregister_fabric(
271 	struct config_group *group,
272 	struct config_item *item)
273 {
274 	struct target_fabric_configfs *tf = container_of(
275 		to_config_group(item), struct target_fabric_configfs, tf_group);
276 
277 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
278 		" tf list\n", config_item_name(item));
279 
280 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
281 			" %s\n", tf->tf_ops->fabric_name);
282 	atomic_dec(&tf->tf_access_cnt);
283 
284 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
285 			" %s\n", config_item_name(item));
286 
287 	configfs_remove_default_groups(&tf->tf_group);
288 	config_item_put(item);
289 }
290 
291 static struct configfs_group_operations target_core_fabric_group_ops = {
292 	.make_group	= &target_core_register_fabric,
293 	.drop_item	= &target_core_deregister_fabric,
294 };
295 
296 /*
297  * All item attributes appearing in /sys/kernel/target/ appear here.
298  */
299 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
300 	&target_core_item_attr_version,
301 	&target_core_item_attr_dbroot,
302 	NULL,
303 };
304 
305 /*
306  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
307  */
308 static const struct config_item_type target_core_fabrics_item = {
309 	.ct_group_ops	= &target_core_fabric_group_ops,
310 	.ct_attrs	= target_core_fabric_item_attrs,
311 	.ct_owner	= THIS_MODULE,
312 };
313 
314 static struct configfs_subsystem target_core_fabrics = {
315 	.su_group = {
316 		.cg_item = {
317 			.ci_namebuf = "target",
318 			.ci_type = &target_core_fabrics_item,
319 		},
320 	},
321 };
322 
323 int target_depend_item(struct config_item *item)
324 {
325 	return configfs_depend_item(&target_core_fabrics, item);
326 }
327 EXPORT_SYMBOL(target_depend_item);
328 
329 void target_undepend_item(struct config_item *item)
330 {
331 	return configfs_undepend_item(item);
332 }
333 EXPORT_SYMBOL(target_undepend_item);
334 
335 /*##############################################################################
336 // Start functions called by external Target Fabrics Modules
337 //############################################################################*/
338 static int target_disable_feature(struct se_portal_group *se_tpg)
339 {
340 	return 0;
341 }
342 
343 static u32 target_default_get_inst_index(struct se_portal_group *se_tpg)
344 {
345 	return 1;
346 }
347 
348 static u32 target_default_sess_get_index(struct se_session *se_sess)
349 {
350 	return 0;
351 }
352 
353 static void target_set_default_node_attributes(struct se_node_acl *se_acl)
354 {
355 }
356 
357 static int target_default_get_cmd_state(struct se_cmd *se_cmd)
358 {
359 	return 0;
360 }
361 
362 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
363 {
364 	if (tfo->fabric_alias) {
365 		if (strlen(tfo->fabric_alias) >= TARGET_FABRIC_NAME_SIZE) {
366 			pr_err("Passed alias: %s exceeds "
367 				"TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_alias);
368 			return -EINVAL;
369 		}
370 	}
371 	if (!tfo->fabric_name) {
372 		pr_err("Missing tfo->fabric_name\n");
373 		return -EINVAL;
374 	}
375 	if (strlen(tfo->fabric_name) >= TARGET_FABRIC_NAME_SIZE) {
376 		pr_err("Passed name: %s exceeds "
377 			"TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_name);
378 		return -EINVAL;
379 	}
380 	if (!tfo->tpg_get_wwn) {
381 		pr_err("Missing tfo->tpg_get_wwn()\n");
382 		return -EINVAL;
383 	}
384 	if (!tfo->tpg_get_tag) {
385 		pr_err("Missing tfo->tpg_get_tag()\n");
386 		return -EINVAL;
387 	}
388 	if (!tfo->release_cmd) {
389 		pr_err("Missing tfo->release_cmd()\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->queue_data_in) {
397 		pr_err("Missing tfo->queue_data_in()\n");
398 		return -EINVAL;
399 	}
400 	if (!tfo->queue_status) {
401 		pr_err("Missing tfo->queue_status()\n");
402 		return -EINVAL;
403 	}
404 	if (!tfo->queue_tm_rsp) {
405 		pr_err("Missing tfo->queue_tm_rsp()\n");
406 		return -EINVAL;
407 	}
408 	if (!tfo->aborted_task) {
409 		pr_err("Missing tfo->aborted_task()\n");
410 		return -EINVAL;
411 	}
412 	if (!tfo->check_stop_free) {
413 		pr_err("Missing tfo->check_stop_free()\n");
414 		return -EINVAL;
415 	}
416 	/*
417 	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
418 	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
419 	 * target_core_fabric_configfs.c WWN+TPG group context code.
420 	 */
421 	if (!tfo->fabric_make_wwn) {
422 		pr_err("Missing tfo->fabric_make_wwn()\n");
423 		return -EINVAL;
424 	}
425 	if (!tfo->fabric_drop_wwn) {
426 		pr_err("Missing tfo->fabric_drop_wwn()\n");
427 		return -EINVAL;
428 	}
429 	if (!tfo->fabric_make_tpg) {
430 		pr_err("Missing tfo->fabric_make_tpg()\n");
431 		return -EINVAL;
432 	}
433 	if (!tfo->fabric_drop_tpg) {
434 		pr_err("Missing tfo->fabric_drop_tpg()\n");
435 		return -EINVAL;
436 	}
437 
438 	return 0;
439 }
440 
441 static void target_set_default_ops(struct target_core_fabric_ops *tfo)
442 {
443 	if (!tfo->tpg_check_demo_mode)
444 		tfo->tpg_check_demo_mode = target_disable_feature;
445 
446 	if (!tfo->tpg_check_demo_mode_cache)
447 		tfo->tpg_check_demo_mode_cache = target_disable_feature;
448 
449 	if (!tfo->tpg_check_demo_mode_write_protect)
450 		tfo->tpg_check_demo_mode_write_protect = target_disable_feature;
451 
452 	if (!tfo->tpg_check_prod_mode_write_protect)
453 		tfo->tpg_check_prod_mode_write_protect = target_disable_feature;
454 
455 	if (!tfo->tpg_get_inst_index)
456 		tfo->tpg_get_inst_index = target_default_get_inst_index;
457 
458 	if (!tfo->sess_get_index)
459 		tfo->sess_get_index = target_default_sess_get_index;
460 
461 	if (!tfo->set_default_node_attributes)
462 		tfo->set_default_node_attributes = target_set_default_node_attributes;
463 
464 	if (!tfo->get_cmd_state)
465 		tfo->get_cmd_state = target_default_get_cmd_state;
466 }
467 
468 int target_register_template(const struct target_core_fabric_ops *fo)
469 {
470 	struct target_core_fabric_ops *tfo;
471 	struct target_fabric_configfs *tf;
472 	int ret;
473 
474 	ret = target_fabric_tf_ops_check(fo);
475 	if (ret)
476 		return ret;
477 
478 	tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
479 	if (!tf) {
480 		pr_err("%s: could not allocate memory!\n", __func__);
481 		return -ENOMEM;
482 	}
483 	tfo = kzalloc(sizeof(struct target_core_fabric_ops), GFP_KERNEL);
484 	if (!tfo) {
485 		kfree(tf);
486 		pr_err("%s: could not allocate memory!\n", __func__);
487 		return -ENOMEM;
488 	}
489 	memcpy(tfo, fo, sizeof(*tfo));
490 	target_set_default_ops(tfo);
491 
492 	INIT_LIST_HEAD(&tf->tf_list);
493 	atomic_set(&tf->tf_access_cnt, 0);
494 	tf->tf_ops = tfo;
495 	target_fabric_setup_cits(tf);
496 
497 	mutex_lock(&g_tf_lock);
498 	list_add_tail(&tf->tf_list, &g_tf_list);
499 	mutex_unlock(&g_tf_lock);
500 
501 	return 0;
502 }
503 EXPORT_SYMBOL(target_register_template);
504 
505 void target_unregister_template(const struct target_core_fabric_ops *fo)
506 {
507 	struct target_fabric_configfs *t;
508 
509 	mutex_lock(&g_tf_lock);
510 	list_for_each_entry(t, &g_tf_list, tf_list) {
511 		if (!strcmp(t->tf_ops->fabric_name, fo->fabric_name)) {
512 			BUG_ON(atomic_read(&t->tf_access_cnt));
513 			list_del(&t->tf_list);
514 			mutex_unlock(&g_tf_lock);
515 			/*
516 			 * Wait for any outstanding fabric se_deve_entry->rcu_head
517 			 * callbacks to complete post kfree_rcu(), before allowing
518 			 * fabric driver unload of TFO->module to proceed.
519 			 */
520 			rcu_barrier();
521 			kfree(t->tf_tpg_base_cit.ct_attrs);
522 			kfree(t->tf_ops);
523 			kfree(t);
524 			return;
525 		}
526 	}
527 	mutex_unlock(&g_tf_lock);
528 }
529 EXPORT_SYMBOL(target_unregister_template);
530 
531 /*##############################################################################
532 // Stop functions called by external Target Fabrics Modules
533 //############################################################################*/
534 
535 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
536 {
537 	return container_of(to_config_group(item), struct se_dev_attrib,
538 			da_group);
539 }
540 
541 /* Start functions for struct config_item_type tb_dev_attrib_cit */
542 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)					\
543 static ssize_t _name##_show(struct config_item *item, char *page)	\
544 {									\
545 	return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
546 }
547 
548 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
549 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
550 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
551 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
552 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
553 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
554 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
555 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
556 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
557 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
558 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
559 DEF_CONFIGFS_ATTRIB_SHOW(emulate_pr);
560 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
561 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
562 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
563 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
564 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
565 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
566 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
567 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
568 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
569 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
570 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
571 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
572 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
573 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
574 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
575 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
576 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
577 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
578 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
579 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rsoc);
580 
581 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)				\
582 static ssize_t _name##_store(struct config_item *item, const char *page,\
583 		size_t count)						\
584 {									\
585 	struct se_dev_attrib *da = to_attrib(item);			\
586 	u32 val;							\
587 	int ret;							\
588 									\
589 	ret = kstrtou32(page, 0, &val);					\
590 	if (ret < 0)							\
591 		return ret;						\
592 	da->_name = val;						\
593 	return count;							\
594 }
595 
596 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
597 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
598 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
599 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
600 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
601 
602 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)				\
603 static ssize_t _name##_store(struct config_item *item, const char *page,	\
604 		size_t count)						\
605 {									\
606 	struct se_dev_attrib *da = to_attrib(item);			\
607 	bool flag;							\
608 	int ret;							\
609 									\
610 	ret = kstrtobool(page, &flag);					\
611 	if (ret < 0)							\
612 		return ret;						\
613 	da->_name = flag;						\
614 	return count;							\
615 }
616 
617 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
618 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
619 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
620 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_pr);
621 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
622 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
623 
624 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)				\
625 static ssize_t _name##_store(struct config_item *item, const char *page,\
626 		size_t count)						\
627 {									\
628 	printk_once(KERN_WARNING					\
629 		"ignoring deprecated %s attribute\n",			\
630 		__stringify(_name));					\
631 	return count;							\
632 }
633 
634 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
635 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
636 
637 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
638 {
639 	const char *configname;
640 
641 	configname = config_item_name(&dev->dev_group.cg_item);
642 	if (strlen(configname) >= INQUIRY_MODEL_LEN) {
643 		pr_warn("dev[%p]: Backstore name '%s' is too long for "
644 			"INQUIRY_MODEL, truncating to 15 characters\n", dev,
645 			configname);
646 	}
647 	/*
648 	 * XXX We can't use sizeof(dev->t10_wwn.model) (INQUIRY_MODEL_LEN + 1)
649 	 * here without potentially breaking existing setups, so continue to
650 	 * truncate one byte shorter than what can be carried in INQUIRY.
651 	 */
652 	strscpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
653 }
654 
655 static ssize_t emulate_model_alias_store(struct config_item *item,
656 		const char *page, size_t count)
657 {
658 	struct se_dev_attrib *da = to_attrib(item);
659 	struct se_device *dev = da->da_dev;
660 	bool flag;
661 	int ret;
662 
663 	if (dev->export_count) {
664 		pr_err("dev[%p]: Unable to change model alias"
665 			" while export_count is %d\n",
666 			dev, dev->export_count);
667 		return -EINVAL;
668 	}
669 
670 	ret = kstrtobool(page, &flag);
671 	if (ret < 0)
672 		return ret;
673 
674 	BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
675 	if (flag) {
676 		dev_set_t10_wwn_model_alias(dev);
677 	} else {
678 		strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
679 			sizeof(dev->t10_wwn.model));
680 	}
681 	da->emulate_model_alias = flag;
682 	return count;
683 }
684 
685 static ssize_t emulate_write_cache_store(struct config_item *item,
686 		const char *page, size_t count)
687 {
688 	struct se_dev_attrib *da = to_attrib(item);
689 	bool flag;
690 	int ret;
691 
692 	ret = kstrtobool(page, &flag);
693 	if (ret < 0)
694 		return ret;
695 
696 	if (flag && da->da_dev->transport->get_write_cache) {
697 		pr_err("emulate_write_cache not supported for this device\n");
698 		return -EINVAL;
699 	}
700 
701 	da->emulate_write_cache = flag;
702 	pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
703 			da->da_dev, flag);
704 	return count;
705 }
706 
707 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
708 		const char *page, size_t count)
709 {
710 	struct se_dev_attrib *da = to_attrib(item);
711 	u32 val;
712 	int ret;
713 
714 	ret = kstrtou32(page, 0, &val);
715 	if (ret < 0)
716 		return ret;
717 
718 	if (val != TARGET_UA_INTLCK_CTRL_CLEAR
719 	 && val != TARGET_UA_INTLCK_CTRL_NO_CLEAR
720 	 && val != TARGET_UA_INTLCK_CTRL_ESTABLISH_UA) {
721 		pr_err("Illegal value %d\n", val);
722 		return -EINVAL;
723 	}
724 
725 	if (da->da_dev->export_count) {
726 		pr_err("dev[%p]: Unable to change SE Device"
727 			" UA_INTRLCK_CTRL while export_count is %d\n",
728 			da->da_dev, da->da_dev->export_count);
729 		return -EINVAL;
730 	}
731 	da->emulate_ua_intlck_ctrl = val;
732 	pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
733 		da->da_dev, val);
734 	return count;
735 }
736 
737 static ssize_t emulate_tas_store(struct config_item *item,
738 		const char *page, size_t count)
739 {
740 	struct se_dev_attrib *da = to_attrib(item);
741 	bool flag;
742 	int ret;
743 
744 	ret = kstrtobool(page, &flag);
745 	if (ret < 0)
746 		return ret;
747 
748 	if (da->da_dev->export_count) {
749 		pr_err("dev[%p]: Unable to change SE Device TAS while"
750 			" export_count is %d\n",
751 			da->da_dev, da->da_dev->export_count);
752 		return -EINVAL;
753 	}
754 	da->emulate_tas = flag;
755 	pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
756 		da->da_dev, flag ? "Enabled" : "Disabled");
757 
758 	return count;
759 }
760 
761 static ssize_t emulate_tpu_store(struct config_item *item,
762 		const char *page, size_t count)
763 {
764 	struct se_dev_attrib *da = to_attrib(item);
765 	struct se_device *dev = da->da_dev;
766 	bool flag;
767 	int ret;
768 
769 	ret = kstrtobool(page, &flag);
770 	if (ret < 0)
771 		return ret;
772 
773 	/*
774 	 * We expect this value to be non-zero when generic Block Layer
775 	 * Discard supported is detected iblock_create_virtdevice().
776 	 */
777 	if (flag && !da->max_unmap_block_desc_count) {
778 		if (!dev->transport->configure_unmap ||
779 		    !dev->transport->configure_unmap(dev)) {
780 			pr_err("Generic Block Discard not supported\n");
781 			return -ENOSYS;
782 		}
783 	}
784 
785 	da->emulate_tpu = flag;
786 	pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
787 		da->da_dev, flag);
788 	return count;
789 }
790 
791 static ssize_t emulate_tpws_store(struct config_item *item,
792 		const char *page, size_t count)
793 {
794 	struct se_dev_attrib *da = to_attrib(item);
795 	struct se_device *dev = da->da_dev;
796 	bool flag;
797 	int ret;
798 
799 	ret = kstrtobool(page, &flag);
800 	if (ret < 0)
801 		return ret;
802 
803 	/*
804 	 * We expect this value to be non-zero when generic Block Layer
805 	 * Discard supported is detected iblock_create_virtdevice().
806 	 */
807 	if (flag && !da->max_unmap_block_desc_count) {
808 		if (!dev->transport->configure_unmap ||
809 		    !dev->transport->configure_unmap(dev)) {
810 			pr_err("Generic Block Discard not supported\n");
811 			return -ENOSYS;
812 		}
813 	}
814 
815 	da->emulate_tpws = flag;
816 	pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
817 				da->da_dev, flag);
818 	return count;
819 }
820 
821 static ssize_t pi_prot_type_store(struct config_item *item,
822 		const char *page, size_t count)
823 {
824 	struct se_dev_attrib *da = to_attrib(item);
825 	int old_prot = da->pi_prot_type, ret;
826 	struct se_device *dev = da->da_dev;
827 	u32 flag;
828 
829 	ret = kstrtou32(page, 0, &flag);
830 	if (ret < 0)
831 		return ret;
832 
833 	if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
834 		pr_err("Illegal value %d for pi_prot_type\n", flag);
835 		return -EINVAL;
836 	}
837 	if (flag == 2) {
838 		pr_err("DIF TYPE2 protection currently not supported\n");
839 		return -ENOSYS;
840 	}
841 	if (da->hw_pi_prot_type) {
842 		pr_warn("DIF protection enabled on underlying hardware,"
843 			" ignoring\n");
844 		return count;
845 	}
846 	if (!dev->transport->init_prot || !dev->transport->free_prot) {
847 		/* 0 is only allowed value for non-supporting backends */
848 		if (flag == 0)
849 			return count;
850 
851 		pr_err("DIF protection not supported by backend: %s\n",
852 		       dev->transport->name);
853 		return -ENOSYS;
854 	}
855 	if (!target_dev_configured(dev)) {
856 		pr_err("DIF protection requires device to be configured\n");
857 		return -ENODEV;
858 	}
859 	if (dev->export_count) {
860 		pr_err("dev[%p]: Unable to change SE Device PROT type while"
861 		       " export_count is %d\n", dev, dev->export_count);
862 		return -EINVAL;
863 	}
864 
865 	da->pi_prot_type = flag;
866 
867 	if (flag && !old_prot) {
868 		ret = dev->transport->init_prot(dev);
869 		if (ret) {
870 			da->pi_prot_type = old_prot;
871 			da->pi_prot_verify = (bool) da->pi_prot_type;
872 			return ret;
873 		}
874 
875 	} else if (!flag && old_prot) {
876 		dev->transport->free_prot(dev);
877 	}
878 
879 	da->pi_prot_verify = (bool) da->pi_prot_type;
880 	pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
881 	return count;
882 }
883 
884 /* always zero, but attr needs to remain RW to avoid userspace breakage */
885 static ssize_t pi_prot_format_show(struct config_item *item, char *page)
886 {
887 	return snprintf(page, PAGE_SIZE, "0\n");
888 }
889 
890 static ssize_t pi_prot_format_store(struct config_item *item,
891 		const char *page, size_t count)
892 {
893 	struct se_dev_attrib *da = to_attrib(item);
894 	struct se_device *dev = da->da_dev;
895 	bool flag;
896 	int ret;
897 
898 	ret = kstrtobool(page, &flag);
899 	if (ret < 0)
900 		return ret;
901 
902 	if (!flag)
903 		return count;
904 
905 	if (!dev->transport->format_prot) {
906 		pr_err("DIF protection format not supported by backend %s\n",
907 		       dev->transport->name);
908 		return -ENOSYS;
909 	}
910 	if (!target_dev_configured(dev)) {
911 		pr_err("DIF protection format requires device to be configured\n");
912 		return -ENODEV;
913 	}
914 	if (dev->export_count) {
915 		pr_err("dev[%p]: Unable to format SE Device PROT type while"
916 		       " export_count is %d\n", dev, dev->export_count);
917 		return -EINVAL;
918 	}
919 
920 	ret = dev->transport->format_prot(dev);
921 	if (ret)
922 		return ret;
923 
924 	pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
925 	return count;
926 }
927 
928 static ssize_t pi_prot_verify_store(struct config_item *item,
929 		const char *page, size_t count)
930 {
931 	struct se_dev_attrib *da = to_attrib(item);
932 	bool flag;
933 	int ret;
934 
935 	ret = kstrtobool(page, &flag);
936 	if (ret < 0)
937 		return ret;
938 
939 	if (!flag) {
940 		da->pi_prot_verify = flag;
941 		return count;
942 	}
943 	if (da->hw_pi_prot_type) {
944 		pr_warn("DIF protection enabled on underlying hardware,"
945 			" ignoring\n");
946 		return count;
947 	}
948 	if (!da->pi_prot_type) {
949 		pr_warn("DIF protection not supported by backend, ignoring\n");
950 		return count;
951 	}
952 	da->pi_prot_verify = flag;
953 
954 	return count;
955 }
956 
957 static ssize_t force_pr_aptpl_store(struct config_item *item,
958 		const char *page, size_t count)
959 {
960 	struct se_dev_attrib *da = to_attrib(item);
961 	bool flag;
962 	int ret;
963 
964 	ret = kstrtobool(page, &flag);
965 	if (ret < 0)
966 		return ret;
967 	if (da->da_dev->export_count) {
968 		pr_err("dev[%p]: Unable to set force_pr_aptpl while"
969 		       " export_count is %d\n",
970 		       da->da_dev, da->da_dev->export_count);
971 		return -EINVAL;
972 	}
973 
974 	da->force_pr_aptpl = flag;
975 	pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
976 	return count;
977 }
978 
979 static ssize_t emulate_rest_reord_store(struct config_item *item,
980 		const char *page, size_t count)
981 {
982 	struct se_dev_attrib *da = to_attrib(item);
983 	bool flag;
984 	int ret;
985 
986 	ret = kstrtobool(page, &flag);
987 	if (ret < 0)
988 		return ret;
989 
990 	if (flag != 0) {
991 		printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
992 			" reordering not implemented\n", da->da_dev);
993 		return -ENOSYS;
994 	}
995 	da->emulate_rest_reord = flag;
996 	pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
997 		da->da_dev, flag);
998 	return count;
999 }
1000 
1001 static ssize_t unmap_zeroes_data_store(struct config_item *item,
1002 		const char *page, size_t count)
1003 {
1004 	struct se_dev_attrib *da = to_attrib(item);
1005 	struct se_device *dev = da->da_dev;
1006 	bool flag;
1007 	int ret;
1008 
1009 	ret = kstrtobool(page, &flag);
1010 	if (ret < 0)
1011 		return ret;
1012 
1013 	if (da->da_dev->export_count) {
1014 		pr_err("dev[%p]: Unable to change SE Device"
1015 		       " unmap_zeroes_data while export_count is %d\n",
1016 		       da->da_dev, da->da_dev->export_count);
1017 		return -EINVAL;
1018 	}
1019 	/*
1020 	 * We expect this value to be non-zero when generic Block Layer
1021 	 * Discard supported is detected iblock_configure_device().
1022 	 */
1023 	if (flag && !da->max_unmap_block_desc_count) {
1024 		if (!dev->transport->configure_unmap ||
1025 		    !dev->transport->configure_unmap(dev)) {
1026 			pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set because max_unmap_block_desc_count is zero\n",
1027 			       da->da_dev);
1028 			return -ENOSYS;
1029 		}
1030 	}
1031 	da->unmap_zeroes_data = flag;
1032 	pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
1033 		 da->da_dev, flag);
1034 	return count;
1035 }
1036 
1037 /*
1038  * Note, this can only be called on unexported SE Device Object.
1039  */
1040 static ssize_t queue_depth_store(struct config_item *item,
1041 		const char *page, size_t count)
1042 {
1043 	struct se_dev_attrib *da = to_attrib(item);
1044 	struct se_device *dev = da->da_dev;
1045 	u32 val;
1046 	int ret;
1047 
1048 	ret = kstrtou32(page, 0, &val);
1049 	if (ret < 0)
1050 		return ret;
1051 
1052 	if (dev->export_count) {
1053 		pr_err("dev[%p]: Unable to change SE Device TCQ while"
1054 			" export_count is %d\n",
1055 			dev, dev->export_count);
1056 		return -EINVAL;
1057 	}
1058 	if (!val) {
1059 		pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1060 		return -EINVAL;
1061 	}
1062 
1063 	if (val > dev->dev_attrib.queue_depth) {
1064 		if (val > dev->dev_attrib.hw_queue_depth) {
1065 			pr_err("dev[%p]: Passed queue_depth:"
1066 				" %u exceeds TCM/SE_Device MAX"
1067 				" TCQ: %u\n", dev, val,
1068 				dev->dev_attrib.hw_queue_depth);
1069 			return -EINVAL;
1070 		}
1071 	}
1072 	da->queue_depth = dev->queue_depth = val;
1073 	pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1074 	return count;
1075 }
1076 
1077 static ssize_t optimal_sectors_store(struct config_item *item,
1078 		const char *page, size_t count)
1079 {
1080 	struct se_dev_attrib *da = to_attrib(item);
1081 	u32 val;
1082 	int ret;
1083 
1084 	ret = kstrtou32(page, 0, &val);
1085 	if (ret < 0)
1086 		return ret;
1087 
1088 	if (da->da_dev->export_count) {
1089 		pr_err("dev[%p]: Unable to change SE Device"
1090 			" optimal_sectors while export_count is %d\n",
1091 			da->da_dev, da->da_dev->export_count);
1092 		return -EINVAL;
1093 	}
1094 	if (val > da->hw_max_sectors) {
1095 		pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1096 			" greater than hw_max_sectors: %u\n",
1097 			da->da_dev, val, da->hw_max_sectors);
1098 		return -EINVAL;
1099 	}
1100 
1101 	da->optimal_sectors = val;
1102 	pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1103 			da->da_dev, val);
1104 	return count;
1105 }
1106 
1107 static ssize_t block_size_store(struct config_item *item,
1108 		const char *page, size_t count)
1109 {
1110 	struct se_dev_attrib *da = to_attrib(item);
1111 	u32 val;
1112 	int ret;
1113 
1114 	ret = kstrtou32(page, 0, &val);
1115 	if (ret < 0)
1116 		return ret;
1117 
1118 	if (da->da_dev->export_count) {
1119 		pr_err("dev[%p]: Unable to change SE Device block_size"
1120 			" while export_count is %d\n",
1121 			da->da_dev, da->da_dev->export_count);
1122 		return -EINVAL;
1123 	}
1124 
1125 	if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1126 		pr_err("dev[%p]: Illegal value for block_device: %u"
1127 			" for SE device, must be 512, 1024, 2048 or 4096\n",
1128 			da->da_dev, val);
1129 		return -EINVAL;
1130 	}
1131 
1132 	da->block_size = val;
1133 
1134 	pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1135 			da->da_dev, val);
1136 	return count;
1137 }
1138 
1139 static ssize_t alua_support_show(struct config_item *item, char *page)
1140 {
1141 	struct se_dev_attrib *da = to_attrib(item);
1142 	u8 flags = da->da_dev->transport_flags;
1143 
1144 	return snprintf(page, PAGE_SIZE, "%d\n",
1145 			flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1146 }
1147 
1148 static ssize_t alua_support_store(struct config_item *item,
1149 		const char *page, size_t count)
1150 {
1151 	struct se_dev_attrib *da = to_attrib(item);
1152 	struct se_device *dev = da->da_dev;
1153 	bool flag, oldflag;
1154 	int ret;
1155 
1156 	ret = kstrtobool(page, &flag);
1157 	if (ret < 0)
1158 		return ret;
1159 
1160 	oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA);
1161 	if (flag == oldflag)
1162 		return count;
1163 
1164 	if (!(dev->transport->transport_flags_changeable &
1165 	      TRANSPORT_FLAG_PASSTHROUGH_ALUA)) {
1166 		pr_err("dev[%p]: Unable to change SE Device alua_support:"
1167 			" alua_support has fixed value\n", dev);
1168 		return -ENOSYS;
1169 	}
1170 
1171 	if (flag)
1172 		dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1173 	else
1174 		dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1175 	return count;
1176 }
1177 
1178 static ssize_t pgr_support_show(struct config_item *item, char *page)
1179 {
1180 	struct se_dev_attrib *da = to_attrib(item);
1181 	u8 flags = da->da_dev->transport_flags;
1182 
1183 	return snprintf(page, PAGE_SIZE, "%d\n",
1184 			flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1185 }
1186 
1187 static ssize_t pgr_support_store(struct config_item *item,
1188 		const char *page, size_t count)
1189 {
1190 	struct se_dev_attrib *da = to_attrib(item);
1191 	struct se_device *dev = da->da_dev;
1192 	bool flag, oldflag;
1193 	int ret;
1194 
1195 	ret = kstrtobool(page, &flag);
1196 	if (ret < 0)
1197 		return ret;
1198 
1199 	oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR);
1200 	if (flag == oldflag)
1201 		return count;
1202 
1203 	if (!(dev->transport->transport_flags_changeable &
1204 	      TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1205 		pr_err("dev[%p]: Unable to change SE Device pgr_support:"
1206 			" pgr_support has fixed value\n", dev);
1207 		return -ENOSYS;
1208 	}
1209 
1210 	if (flag)
1211 		dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_PGR;
1212 	else
1213 		dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_PGR;
1214 	return count;
1215 }
1216 
1217 static ssize_t emulate_rsoc_store(struct config_item *item,
1218 		const char *page, size_t count)
1219 {
1220 	struct se_dev_attrib *da = to_attrib(item);
1221 	bool flag;
1222 	int ret;
1223 
1224 	ret = kstrtobool(page, &flag);
1225 	if (ret < 0)
1226 		return ret;
1227 
1228 	da->emulate_rsoc = flag;
1229 	pr_debug("dev[%p]: SE Device REPORT_SUPPORTED_OPERATION_CODES_EMULATION flag: %d\n",
1230 			da->da_dev, flag);
1231 	return count;
1232 }
1233 
1234 CONFIGFS_ATTR(, emulate_model_alias);
1235 CONFIGFS_ATTR(, emulate_dpo);
1236 CONFIGFS_ATTR(, emulate_fua_write);
1237 CONFIGFS_ATTR(, emulate_fua_read);
1238 CONFIGFS_ATTR(, emulate_write_cache);
1239 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1240 CONFIGFS_ATTR(, emulate_tas);
1241 CONFIGFS_ATTR(, emulate_tpu);
1242 CONFIGFS_ATTR(, emulate_tpws);
1243 CONFIGFS_ATTR(, emulate_caw);
1244 CONFIGFS_ATTR(, emulate_3pc);
1245 CONFIGFS_ATTR(, emulate_pr);
1246 CONFIGFS_ATTR(, emulate_rsoc);
1247 CONFIGFS_ATTR(, pi_prot_type);
1248 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1249 CONFIGFS_ATTR(, pi_prot_format);
1250 CONFIGFS_ATTR(, pi_prot_verify);
1251 CONFIGFS_ATTR(, enforce_pr_isids);
1252 CONFIGFS_ATTR(, is_nonrot);
1253 CONFIGFS_ATTR(, emulate_rest_reord);
1254 CONFIGFS_ATTR(, force_pr_aptpl);
1255 CONFIGFS_ATTR_RO(, hw_block_size);
1256 CONFIGFS_ATTR(, block_size);
1257 CONFIGFS_ATTR_RO(, hw_max_sectors);
1258 CONFIGFS_ATTR(, optimal_sectors);
1259 CONFIGFS_ATTR_RO(, hw_queue_depth);
1260 CONFIGFS_ATTR(, queue_depth);
1261 CONFIGFS_ATTR(, max_unmap_lba_count);
1262 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1263 CONFIGFS_ATTR(, unmap_granularity);
1264 CONFIGFS_ATTR(, unmap_granularity_alignment);
1265 CONFIGFS_ATTR(, unmap_zeroes_data);
1266 CONFIGFS_ATTR(, max_write_same_len);
1267 CONFIGFS_ATTR(, alua_support);
1268 CONFIGFS_ATTR(, pgr_support);
1269 
1270 /*
1271  * dev_attrib attributes for devices using the target core SBC/SPC
1272  * interpreter.  Any backend using spc_parse_cdb should be using
1273  * these.
1274  */
1275 struct configfs_attribute *sbc_attrib_attrs[] = {
1276 	&attr_emulate_model_alias,
1277 	&attr_emulate_dpo,
1278 	&attr_emulate_fua_write,
1279 	&attr_emulate_fua_read,
1280 	&attr_emulate_write_cache,
1281 	&attr_emulate_ua_intlck_ctrl,
1282 	&attr_emulate_tas,
1283 	&attr_emulate_tpu,
1284 	&attr_emulate_tpws,
1285 	&attr_emulate_caw,
1286 	&attr_emulate_3pc,
1287 	&attr_emulate_pr,
1288 	&attr_pi_prot_type,
1289 	&attr_hw_pi_prot_type,
1290 	&attr_pi_prot_format,
1291 	&attr_pi_prot_verify,
1292 	&attr_enforce_pr_isids,
1293 	&attr_is_nonrot,
1294 	&attr_emulate_rest_reord,
1295 	&attr_force_pr_aptpl,
1296 	&attr_hw_block_size,
1297 	&attr_block_size,
1298 	&attr_hw_max_sectors,
1299 	&attr_optimal_sectors,
1300 	&attr_hw_queue_depth,
1301 	&attr_queue_depth,
1302 	&attr_max_unmap_lba_count,
1303 	&attr_max_unmap_block_desc_count,
1304 	&attr_unmap_granularity,
1305 	&attr_unmap_granularity_alignment,
1306 	&attr_unmap_zeroes_data,
1307 	&attr_max_write_same_len,
1308 	&attr_alua_support,
1309 	&attr_pgr_support,
1310 	&attr_emulate_rsoc,
1311 	NULL,
1312 };
1313 EXPORT_SYMBOL(sbc_attrib_attrs);
1314 
1315 /*
1316  * Minimal dev_attrib attributes for devices passing through CDBs.
1317  * In this case we only provide a few read-only attributes for
1318  * backwards compatibility.
1319  */
1320 struct configfs_attribute *passthrough_attrib_attrs[] = {
1321 	&attr_hw_pi_prot_type,
1322 	&attr_hw_block_size,
1323 	&attr_hw_max_sectors,
1324 	&attr_hw_queue_depth,
1325 	&attr_emulate_pr,
1326 	&attr_alua_support,
1327 	&attr_pgr_support,
1328 	NULL,
1329 };
1330 EXPORT_SYMBOL(passthrough_attrib_attrs);
1331 
1332 /*
1333  * pr related dev_attrib attributes for devices passing through CDBs,
1334  * but allowing in core pr emulation.
1335  */
1336 struct configfs_attribute *passthrough_pr_attrib_attrs[] = {
1337 	&attr_enforce_pr_isids,
1338 	&attr_force_pr_aptpl,
1339 	NULL,
1340 };
1341 EXPORT_SYMBOL(passthrough_pr_attrib_attrs);
1342 
1343 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1344 TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
1345 
1346 /* End functions for struct config_item_type tb_dev_attrib_cit */
1347 
1348 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1349 
1350 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1351 {
1352 	return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1353 }
1354 
1355 static ssize_t target_check_inquiry_data(char *buf)
1356 {
1357 	size_t len;
1358 	int i;
1359 
1360 	len = strlen(buf);
1361 
1362 	/*
1363 	 * SPC 4.3.1:
1364 	 * ASCII data fields shall contain only ASCII printable characters
1365 	 * (i.e., code values 20h to 7Eh) and may be terminated with one or
1366 	 * more ASCII null (00h) characters.
1367 	 */
1368 	for (i = 0; i < len; i++) {
1369 		if (buf[i] < 0x20 || buf[i] > 0x7E) {
1370 			pr_err("Emulated T10 Inquiry Data contains non-ASCII-printable characters\n");
1371 			return -EINVAL;
1372 		}
1373 	}
1374 
1375 	return len;
1376 }
1377 
1378 /*
1379  * STANDARD and VPD page 0x83 T10 Vendor Identification
1380  */
1381 static ssize_t target_wwn_vendor_id_show(struct config_item *item,
1382 		char *page)
1383 {
1384 	return sprintf(page, "%s\n", &to_t10_wwn(item)->vendor[0]);
1385 }
1386 
1387 static ssize_t target_wwn_vendor_id_store(struct config_item *item,
1388 		const char *page, size_t count)
1389 {
1390 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1391 	struct se_device *dev = t10_wwn->t10_dev;
1392 	/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1393 	unsigned char buf[INQUIRY_VENDOR_LEN + 2];
1394 	char *stripped = NULL;
1395 	ssize_t len;
1396 	ssize_t ret;
1397 
1398 	len = strscpy(buf, page, sizeof(buf));
1399 	if (len > 0) {
1400 		/* Strip any newline added from userspace. */
1401 		stripped = strstrip(buf);
1402 		len = strlen(stripped);
1403 	}
1404 	if (len < 0 || len > INQUIRY_VENDOR_LEN) {
1405 		pr_err("Emulated T10 Vendor Identification exceeds"
1406 			" INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
1407 			"\n");
1408 		return -EOVERFLOW;
1409 	}
1410 
1411 	ret = target_check_inquiry_data(stripped);
1412 
1413 	if (ret < 0)
1414 		return ret;
1415 
1416 	/*
1417 	 * Check to see if any active exports exist.  If they do exist, fail
1418 	 * here as changing this information on the fly (underneath the
1419 	 * initiator side OS dependent multipath code) could cause negative
1420 	 * effects.
1421 	 */
1422 	if (dev->export_count) {
1423 		pr_err("Unable to set T10 Vendor Identification while"
1424 			" active %d exports exist\n", dev->export_count);
1425 		return -EINVAL;
1426 	}
1427 
1428 	BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
1429 	strscpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));
1430 
1431 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"
1432 		 " %s\n", dev->t10_wwn.vendor);
1433 
1434 	return count;
1435 }
1436 
1437 static ssize_t target_wwn_product_id_show(struct config_item *item,
1438 		char *page)
1439 {
1440 	return sprintf(page, "%s\n", &to_t10_wwn(item)->model[0]);
1441 }
1442 
1443 static ssize_t target_wwn_product_id_store(struct config_item *item,
1444 		const char *page, size_t count)
1445 {
1446 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1447 	struct se_device *dev = t10_wwn->t10_dev;
1448 	/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1449 	unsigned char buf[INQUIRY_MODEL_LEN + 2];
1450 	char *stripped = NULL;
1451 	ssize_t len;
1452 	ssize_t ret;
1453 
1454 	len = strscpy(buf, page, sizeof(buf));
1455 	if (len > 0) {
1456 		/* Strip any newline added from userspace. */
1457 		stripped = strstrip(buf);
1458 		len = strlen(stripped);
1459 	}
1460 	if (len < 0 || len > INQUIRY_MODEL_LEN) {
1461 		pr_err("Emulated T10 Vendor exceeds INQUIRY_MODEL_LEN: "
1462 			 __stringify(INQUIRY_MODEL_LEN)
1463 			"\n");
1464 		return -EOVERFLOW;
1465 	}
1466 
1467 	ret = target_check_inquiry_data(stripped);
1468 
1469 	if (ret < 0)
1470 		return ret;
1471 
1472 	/*
1473 	 * Check to see if any active exports exist.  If they do exist, fail
1474 	 * here as changing this information on the fly (underneath the
1475 	 * initiator side OS dependent multipath code) could cause negative
1476 	 * effects.
1477 	 */
1478 	if (dev->export_count) {
1479 		pr_err("Unable to set T10 Model while active %d exports exist\n",
1480 			dev->export_count);
1481 		return -EINVAL;
1482 	}
1483 
1484 	BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
1485 	strscpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));
1486 
1487 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Model Identification: %s\n",
1488 		 dev->t10_wwn.model);
1489 
1490 	return count;
1491 }
1492 
1493 static ssize_t target_wwn_revision_show(struct config_item *item,
1494 		char *page)
1495 {
1496 	return sprintf(page, "%s\n", &to_t10_wwn(item)->revision[0]);
1497 }
1498 
1499 static ssize_t target_wwn_revision_store(struct config_item *item,
1500 		const char *page, size_t count)
1501 {
1502 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1503 	struct se_device *dev = t10_wwn->t10_dev;
1504 	/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1505 	unsigned char buf[INQUIRY_REVISION_LEN + 2];
1506 	char *stripped = NULL;
1507 	ssize_t len;
1508 	ssize_t ret;
1509 
1510 	len = strscpy(buf, page, sizeof(buf));
1511 	if (len > 0) {
1512 		/* Strip any newline added from userspace. */
1513 		stripped = strstrip(buf);
1514 		len = strlen(stripped);
1515 	}
1516 	if (len < 0 || len > INQUIRY_REVISION_LEN) {
1517 		pr_err("Emulated T10 Revision exceeds INQUIRY_REVISION_LEN: "
1518 			 __stringify(INQUIRY_REVISION_LEN)
1519 			"\n");
1520 		return -EOVERFLOW;
1521 	}
1522 
1523 	ret = target_check_inquiry_data(stripped);
1524 
1525 	if (ret < 0)
1526 		return ret;
1527 
1528 	/*
1529 	 * Check to see if any active exports exist.  If they do exist, fail
1530 	 * here as changing this information on the fly (underneath the
1531 	 * initiator side OS dependent multipath code) could cause negative
1532 	 * effects.
1533 	 */
1534 	if (dev->export_count) {
1535 		pr_err("Unable to set T10 Revision while active %d exports exist\n",
1536 			dev->export_count);
1537 		return -EINVAL;
1538 	}
1539 
1540 	BUILD_BUG_ON(sizeof(dev->t10_wwn.revision) != INQUIRY_REVISION_LEN + 1);
1541 	strscpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));
1542 
1543 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Revision: %s\n",
1544 		 dev->t10_wwn.revision);
1545 
1546 	return count;
1547 }
1548 
1549 static ssize_t
1550 target_wwn_company_id_show(struct config_item *item,
1551 				char *page)
1552 {
1553 	return snprintf(page, PAGE_SIZE, "%#08x\n",
1554 			to_t10_wwn(item)->company_id);
1555 }
1556 
1557 static ssize_t
1558 target_wwn_company_id_store(struct config_item *item,
1559 				 const char *page, size_t count)
1560 {
1561 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1562 	struct se_device *dev = t10_wwn->t10_dev;
1563 	u32 val;
1564 	int ret;
1565 
1566 	/*
1567 	 * The IEEE COMPANY_ID field should contain a 24-bit canonical
1568 	 * form OUI assigned by the IEEE.
1569 	 */
1570 	ret = kstrtou32(page, 0, &val);
1571 	if (ret < 0)
1572 		return ret;
1573 
1574 	if (val >= 0x1000000)
1575 		return -EOVERFLOW;
1576 
1577 	/*
1578 	 * Check to see if any active exports exist. If they do exist, fail
1579 	 * here as changing this information on the fly (underneath the
1580 	 * initiator side OS dependent multipath code) could cause negative
1581 	 * effects.
1582 	 */
1583 	if (dev->export_count) {
1584 		pr_err("Unable to set Company ID while %u exports exist\n",
1585 		       dev->export_count);
1586 		return -EINVAL;
1587 	}
1588 
1589 	t10_wwn->company_id = val;
1590 
1591 	pr_debug("Target_Core_ConfigFS: Set IEEE Company ID: %#08x\n",
1592 		 t10_wwn->company_id);
1593 
1594 	return count;
1595 }
1596 
1597 /*
1598  * VPD page 0x80 Unit serial
1599  */
1600 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1601 		char *page)
1602 {
1603 	return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1604 		&to_t10_wwn(item)->unit_serial[0]);
1605 }
1606 
1607 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1608 		const char *page, size_t count)
1609 {
1610 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1611 	struct se_device *dev = t10_wwn->t10_dev;
1612 	unsigned char buf[INQUIRY_VPD_SERIAL_LEN] = { };
1613 
1614 	/*
1615 	 * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1616 	 * from the struct scsi_device level firmware, do not allow
1617 	 * VPD Unit Serial to be emulated.
1618 	 *
1619 	 * Note this struct scsi_device could also be emulating VPD
1620 	 * information from its drivers/scsi LLD.  But for now we assume
1621 	 * it is doing 'the right thing' wrt a world wide unique
1622 	 * VPD Unit Serial Number that OS dependent multipath can depend on.
1623 	 */
1624 	if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1625 		pr_err("Underlying SCSI device firmware provided VPD"
1626 			" Unit Serial, ignoring request\n");
1627 		return -EOPNOTSUPP;
1628 	}
1629 
1630 	if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1631 		pr_err("Emulated VPD Unit Serial exceeds"
1632 		" INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1633 		return -EOVERFLOW;
1634 	}
1635 	/*
1636 	 * Check to see if any active $FABRIC_MOD exports exist.  If they
1637 	 * do exist, fail here as changing this information on the fly
1638 	 * (underneath the initiator side OS dependent multipath code)
1639 	 * could cause negative effects.
1640 	 */
1641 	if (dev->export_count) {
1642 		pr_err("Unable to set VPD Unit Serial while"
1643 			" active %d $FABRIC_MOD exports exist\n",
1644 			dev->export_count);
1645 		return -EINVAL;
1646 	}
1647 
1648 	/*
1649 	 * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1650 	 *
1651 	 * Also, strip any newline added from the userspace
1652 	 * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1653 	 */
1654 	snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1655 	snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1656 			"%s", strstrip(buf));
1657 	dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1658 
1659 	pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1660 			" %s\n", dev->t10_wwn.unit_serial);
1661 
1662 	return count;
1663 }
1664 
1665 /*
1666  * VPD page 0x83 Protocol Identifier
1667  */
1668 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1669 		char *page)
1670 {
1671 	struct t10_wwn *t10_wwn = to_t10_wwn(item);
1672 	struct t10_vpd *vpd;
1673 	unsigned char buf[VPD_TMP_BUF_SIZE] = { };
1674 	ssize_t len = 0;
1675 
1676 	spin_lock(&t10_wwn->t10_vpd_lock);
1677 	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1678 		if (!vpd->protocol_identifier_set)
1679 			continue;
1680 
1681 		transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1682 
1683 		if (len + strlen(buf) >= PAGE_SIZE)
1684 			break;
1685 
1686 		len += sprintf(page+len, "%s", buf);
1687 	}
1688 	spin_unlock(&t10_wwn->t10_vpd_lock);
1689 
1690 	return len;
1691 }
1692 
1693 /*
1694  * Generic wrapper for dumping VPD identifiers by association.
1695  */
1696 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)				\
1697 static ssize_t target_wwn_##_name##_show(struct config_item *item,	\
1698 		char *page)						\
1699 {									\
1700 	struct t10_wwn *t10_wwn = to_t10_wwn(item);			\
1701 	struct t10_vpd *vpd;						\
1702 	unsigned char buf[VPD_TMP_BUF_SIZE];				\
1703 	ssize_t len = 0;						\
1704 									\
1705 	spin_lock(&t10_wwn->t10_vpd_lock);				\
1706 	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {	\
1707 		if (vpd->association != _assoc)				\
1708 			continue;					\
1709 									\
1710 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1711 		transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);	\
1712 		if (len + strlen(buf) >= PAGE_SIZE)			\
1713 			break;						\
1714 		len += sprintf(page+len, "%s", buf);			\
1715 									\
1716 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1717 		transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1718 		if (len + strlen(buf) >= PAGE_SIZE)			\
1719 			break;						\
1720 		len += sprintf(page+len, "%s", buf);			\
1721 									\
1722 		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
1723 		transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1724 		if (len + strlen(buf) >= PAGE_SIZE)			\
1725 			break;						\
1726 		len += sprintf(page+len, "%s", buf);			\
1727 	}								\
1728 	spin_unlock(&t10_wwn->t10_vpd_lock);				\
1729 									\
1730 	return len;							\
1731 }
1732 
1733 /* VPD page 0x83 Association: Logical Unit */
1734 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1735 /* VPD page 0x83 Association: Target Port */
1736 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1737 /* VPD page 0x83 Association: SCSI Target Device */
1738 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1739 
1740 CONFIGFS_ATTR(target_wwn_, vendor_id);
1741 CONFIGFS_ATTR(target_wwn_, product_id);
1742 CONFIGFS_ATTR(target_wwn_, revision);
1743 CONFIGFS_ATTR(target_wwn_, company_id);
1744 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1745 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1746 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1747 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1748 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1749 
1750 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1751 	&target_wwn_attr_vendor_id,
1752 	&target_wwn_attr_product_id,
1753 	&target_wwn_attr_revision,
1754 	&target_wwn_attr_company_id,
1755 	&target_wwn_attr_vpd_unit_serial,
1756 	&target_wwn_attr_vpd_protocol_identifier,
1757 	&target_wwn_attr_vpd_assoc_logical_unit,
1758 	&target_wwn_attr_vpd_assoc_target_port,
1759 	&target_wwn_attr_vpd_assoc_scsi_target_device,
1760 	NULL,
1761 };
1762 
1763 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1764 
1765 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1766 
1767 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1768 
1769 static struct se_device *pr_to_dev(struct config_item *item)
1770 {
1771 	return container_of(to_config_group(item), struct se_device,
1772 			dev_pr_group);
1773 }
1774 
1775 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1776 		char *page)
1777 {
1778 	struct se_node_acl *se_nacl;
1779 	struct t10_pr_registration *pr_reg;
1780 	char i_buf[PR_REG_ISID_ID_LEN] = { };
1781 
1782 	pr_reg = dev->dev_pr_res_holder;
1783 	if (!pr_reg)
1784 		return sprintf(page, "No SPC-3 Reservation holder\n");
1785 
1786 	se_nacl = pr_reg->pr_reg_nacl;
1787 	core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1788 
1789 	return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1790 		se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1791 		se_nacl->initiatorname, i_buf);
1792 }
1793 
1794 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1795 		char *page)
1796 {
1797 	struct se_session *sess = dev->reservation_holder;
1798 	struct se_node_acl *se_nacl;
1799 	ssize_t len;
1800 
1801 	if (sess) {
1802 		se_nacl = sess->se_node_acl;
1803 		len = sprintf(page,
1804 			      "SPC-2 Reservation: %s Initiator: %s\n",
1805 			      se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1806 			      se_nacl->initiatorname);
1807 	} else {
1808 		len = sprintf(page, "No SPC-2 Reservation holder\n");
1809 	}
1810 	return len;
1811 }
1812 
1813 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1814 {
1815 	struct se_device *dev = pr_to_dev(item);
1816 	int ret;
1817 
1818 	if (!dev->dev_attrib.emulate_pr)
1819 		return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1820 
1821 	if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1822 		return sprintf(page, "Passthrough\n");
1823 
1824 	spin_lock(&dev->dev_reservation_lock);
1825 	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1826 		ret = target_core_dev_pr_show_spc2_res(dev, page);
1827 	else
1828 		ret = target_core_dev_pr_show_spc3_res(dev, page);
1829 	spin_unlock(&dev->dev_reservation_lock);
1830 	return ret;
1831 }
1832 
1833 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1834 		char *page)
1835 {
1836 	struct se_device *dev = pr_to_dev(item);
1837 	ssize_t len = 0;
1838 
1839 	spin_lock(&dev->dev_reservation_lock);
1840 	if (!dev->dev_pr_res_holder) {
1841 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1842 	} else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1843 		len = sprintf(page, "SPC-3 Reservation: All Target"
1844 			" Ports registration\n");
1845 	} else {
1846 		len = sprintf(page, "SPC-3 Reservation: Single"
1847 			" Target Port registration\n");
1848 	}
1849 
1850 	spin_unlock(&dev->dev_reservation_lock);
1851 	return len;
1852 }
1853 
1854 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1855 		char *page)
1856 {
1857 	return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1858 }
1859 
1860 
1861 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1862 		char *page)
1863 {
1864 	struct se_device *dev = pr_to_dev(item);
1865 	struct se_node_acl *se_nacl;
1866 	struct se_portal_group *se_tpg;
1867 	struct t10_pr_registration *pr_reg;
1868 	const struct target_core_fabric_ops *tfo;
1869 	ssize_t len = 0;
1870 
1871 	spin_lock(&dev->dev_reservation_lock);
1872 	pr_reg = dev->dev_pr_res_holder;
1873 	if (!pr_reg) {
1874 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1875 		goto out_unlock;
1876 	}
1877 
1878 	se_nacl = pr_reg->pr_reg_nacl;
1879 	se_tpg = se_nacl->se_tpg;
1880 	tfo = se_tpg->se_tpg_tfo;
1881 
1882 	len += sprintf(page+len, "SPC-3 Reservation: %s"
1883 		" Target Node Endpoint: %s\n", tfo->fabric_name,
1884 		tfo->tpg_get_wwn(se_tpg));
1885 	len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1886 		" Identifier Tag: %hu %s Portal Group Tag: %hu"
1887 		" %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1888 		tfo->fabric_name, tfo->tpg_get_tag(se_tpg),
1889 		tfo->fabric_name, pr_reg->pr_aptpl_target_lun);
1890 
1891 out_unlock:
1892 	spin_unlock(&dev->dev_reservation_lock);
1893 	return len;
1894 }
1895 
1896 
1897 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1898 		char *page)
1899 {
1900 	struct se_device *dev = pr_to_dev(item);
1901 	const struct target_core_fabric_ops *tfo;
1902 	struct t10_pr_registration *pr_reg;
1903 	unsigned char buf[384];
1904 	char i_buf[PR_REG_ISID_ID_LEN];
1905 	ssize_t len = 0;
1906 	int reg_count = 0;
1907 
1908 	len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1909 
1910 	spin_lock(&dev->t10_pr.registration_lock);
1911 	list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1912 			pr_reg_list) {
1913 
1914 		memset(buf, 0, 384);
1915 		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1916 		tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1917 		core_pr_dump_initiator_port(pr_reg, i_buf,
1918 					PR_REG_ISID_ID_LEN);
1919 		sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1920 			tfo->fabric_name,
1921 			pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1922 			pr_reg->pr_res_generation);
1923 
1924 		if (len + strlen(buf) >= PAGE_SIZE)
1925 			break;
1926 
1927 		len += sprintf(page+len, "%s", buf);
1928 		reg_count++;
1929 	}
1930 	spin_unlock(&dev->t10_pr.registration_lock);
1931 
1932 	if (!reg_count)
1933 		len += sprintf(page+len, "None\n");
1934 
1935 	return len;
1936 }
1937 
1938 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1939 {
1940 	struct se_device *dev = pr_to_dev(item);
1941 	struct t10_pr_registration *pr_reg;
1942 	ssize_t len = 0;
1943 
1944 	spin_lock(&dev->dev_reservation_lock);
1945 	pr_reg = dev->dev_pr_res_holder;
1946 	if (pr_reg) {
1947 		len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1948 			core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1949 	} else {
1950 		len = sprintf(page, "No SPC-3 Reservation holder\n");
1951 	}
1952 
1953 	spin_unlock(&dev->dev_reservation_lock);
1954 	return len;
1955 }
1956 
1957 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1958 {
1959 	struct se_device *dev = pr_to_dev(item);
1960 
1961 	if (!dev->dev_attrib.emulate_pr)
1962 		return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1963 	if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1964 		return sprintf(page, "SPC_PASSTHROUGH\n");
1965 	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1966 		return sprintf(page, "SPC2_RESERVATIONS\n");
1967 
1968 	return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1969 }
1970 
1971 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1972 		char *page)
1973 {
1974 	struct se_device *dev = pr_to_dev(item);
1975 
1976 	if (!dev->dev_attrib.emulate_pr ||
1977 	    (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1978 		return 0;
1979 
1980 	return sprintf(page, "APTPL Bit Status: %s\n",
1981 		(dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1982 }
1983 
1984 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1985 		char *page)
1986 {
1987 	struct se_device *dev = pr_to_dev(item);
1988 
1989 	if (!dev->dev_attrib.emulate_pr ||
1990 	    (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1991 		return 0;
1992 
1993 	return sprintf(page, "Ready to process PR APTPL metadata..\n");
1994 }
1995 
1996 enum {
1997 	Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1998 	Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1999 	Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
2000 	Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
2001 };
2002 
2003 static match_table_t tokens = {
2004 	{Opt_initiator_fabric, "initiator_fabric=%s"},
2005 	{Opt_initiator_node, "initiator_node=%s"},
2006 	{Opt_initiator_sid, "initiator_sid=%s"},
2007 	{Opt_sa_res_key, "sa_res_key=%s"},
2008 	{Opt_res_holder, "res_holder=%d"},
2009 	{Opt_res_type, "res_type=%d"},
2010 	{Opt_res_scope, "res_scope=%d"},
2011 	{Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
2012 	{Opt_mapped_lun, "mapped_lun=%u"},
2013 	{Opt_target_fabric, "target_fabric=%s"},
2014 	{Opt_target_node, "target_node=%s"},
2015 	{Opt_tpgt, "tpgt=%d"},
2016 	{Opt_port_rtpi, "port_rtpi=%d"},
2017 	{Opt_target_lun, "target_lun=%u"},
2018 	{Opt_err, NULL}
2019 };
2020 
2021 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
2022 		const char *page, size_t count)
2023 {
2024 	struct se_device *dev = pr_to_dev(item);
2025 	unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
2026 	unsigned char *t_fabric = NULL, *t_port = NULL;
2027 	char *orig, *ptr, *opts;
2028 	substring_t args[MAX_OPT_ARGS];
2029 	unsigned long long tmp_ll;
2030 	u64 sa_res_key = 0;
2031 	u64 mapped_lun = 0, target_lun = 0;
2032 	int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
2033 	u16 tpgt = 0;
2034 	u8 type = 0;
2035 
2036 	if (!dev->dev_attrib.emulate_pr ||
2037 	    (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
2038 		return count;
2039 	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
2040 		return count;
2041 
2042 	if (dev->export_count) {
2043 		pr_debug("Unable to process APTPL metadata while"
2044 			" active fabric exports exist\n");
2045 		return -EINVAL;
2046 	}
2047 
2048 	opts = kstrdup(page, GFP_KERNEL);
2049 	if (!opts)
2050 		return -ENOMEM;
2051 
2052 	orig = opts;
2053 	while ((ptr = strsep(&opts, ",\n")) != NULL) {
2054 		if (!*ptr)
2055 			continue;
2056 
2057 		token = match_token(ptr, tokens, args);
2058 		switch (token) {
2059 		case Opt_initiator_fabric:
2060 			i_fabric = match_strdup(args);
2061 			if (!i_fabric) {
2062 				ret = -ENOMEM;
2063 				goto out;
2064 			}
2065 			break;
2066 		case Opt_initiator_node:
2067 			i_port = match_strdup(args);
2068 			if (!i_port) {
2069 				ret = -ENOMEM;
2070 				goto out;
2071 			}
2072 			if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
2073 				pr_err("APTPL metadata initiator_node="
2074 					" exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
2075 					PR_APTPL_MAX_IPORT_LEN);
2076 				ret = -EINVAL;
2077 				break;
2078 			}
2079 			break;
2080 		case Opt_initiator_sid:
2081 			isid = match_strdup(args);
2082 			if (!isid) {
2083 				ret = -ENOMEM;
2084 				goto out;
2085 			}
2086 			if (strlen(isid) >= PR_REG_ISID_LEN) {
2087 				pr_err("APTPL metadata initiator_isid"
2088 					"= exceeds PR_REG_ISID_LEN: %d\n",
2089 					PR_REG_ISID_LEN);
2090 				ret = -EINVAL;
2091 				break;
2092 			}
2093 			break;
2094 		case Opt_sa_res_key:
2095 			ret = match_u64(args,  &tmp_ll);
2096 			if (ret < 0) {
2097 				pr_err("kstrtoull() failed for sa_res_key=\n");
2098 				goto out;
2099 			}
2100 			sa_res_key = (u64)tmp_ll;
2101 			break;
2102 		/*
2103 		 * PR APTPL Metadata for Reservation
2104 		 */
2105 		case Opt_res_holder:
2106 			ret = match_int(args, &arg);
2107 			if (ret)
2108 				goto out;
2109 			res_holder = arg;
2110 			break;
2111 		case Opt_res_type:
2112 			ret = match_int(args, &arg);
2113 			if (ret)
2114 				goto out;
2115 			type = (u8)arg;
2116 			break;
2117 		case Opt_res_scope:
2118 			ret = match_int(args, &arg);
2119 			if (ret)
2120 				goto out;
2121 			break;
2122 		case Opt_res_all_tg_pt:
2123 			ret = match_int(args, &arg);
2124 			if (ret)
2125 				goto out;
2126 			all_tg_pt = (int)arg;
2127 			break;
2128 		case Opt_mapped_lun:
2129 			ret = match_u64(args, &tmp_ll);
2130 			if (ret)
2131 				goto out;
2132 			mapped_lun = (u64)tmp_ll;
2133 			break;
2134 		/*
2135 		 * PR APTPL Metadata for Target Port
2136 		 */
2137 		case Opt_target_fabric:
2138 			t_fabric = match_strdup(args);
2139 			if (!t_fabric) {
2140 				ret = -ENOMEM;
2141 				goto out;
2142 			}
2143 			break;
2144 		case Opt_target_node:
2145 			t_port = match_strdup(args);
2146 			if (!t_port) {
2147 				ret = -ENOMEM;
2148 				goto out;
2149 			}
2150 			if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
2151 				pr_err("APTPL metadata target_node="
2152 					" exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
2153 					PR_APTPL_MAX_TPORT_LEN);
2154 				ret = -EINVAL;
2155 				break;
2156 			}
2157 			break;
2158 		case Opt_tpgt:
2159 			ret = match_int(args, &arg);
2160 			if (ret)
2161 				goto out;
2162 			tpgt = (u16)arg;
2163 			break;
2164 		case Opt_port_rtpi:
2165 			ret = match_int(args, &arg);
2166 			if (ret)
2167 				goto out;
2168 			break;
2169 		case Opt_target_lun:
2170 			ret = match_u64(args, &tmp_ll);
2171 			if (ret)
2172 				goto out;
2173 			target_lun = (u64)tmp_ll;
2174 			break;
2175 		default:
2176 			break;
2177 		}
2178 	}
2179 
2180 	if (!i_port || !t_port || !sa_res_key) {
2181 		pr_err("Illegal parameters for APTPL registration\n");
2182 		ret = -EINVAL;
2183 		goto out;
2184 	}
2185 
2186 	if (res_holder && !(type)) {
2187 		pr_err("Illegal PR type: 0x%02x for reservation"
2188 				" holder\n", type);
2189 		ret = -EINVAL;
2190 		goto out;
2191 	}
2192 
2193 	ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
2194 			i_port, isid, mapped_lun, t_port, tpgt, target_lun,
2195 			res_holder, all_tg_pt, type);
2196 out:
2197 	kfree(i_fabric);
2198 	kfree(i_port);
2199 	kfree(isid);
2200 	kfree(t_fabric);
2201 	kfree(t_port);
2202 	kfree(orig);
2203 	return (ret == 0) ? count : ret;
2204 }
2205 
2206 
2207 CONFIGFS_ATTR_RO(target_pr_, res_holder);
2208 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
2209 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
2210 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
2211 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
2212 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
2213 CONFIGFS_ATTR_RO(target_pr_, res_type);
2214 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
2215 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
2216 
2217 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
2218 	&target_pr_attr_res_holder,
2219 	&target_pr_attr_res_pr_all_tgt_pts,
2220 	&target_pr_attr_res_pr_generation,
2221 	&target_pr_attr_res_pr_holder_tg_port,
2222 	&target_pr_attr_res_pr_registered_i_pts,
2223 	&target_pr_attr_res_pr_type,
2224 	&target_pr_attr_res_type,
2225 	&target_pr_attr_res_aptpl_active,
2226 	&target_pr_attr_res_aptpl_metadata,
2227 	NULL,
2228 };
2229 
2230 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
2231 
2232 /*  End functions for struct config_item_type tb_dev_pr_cit */
2233 
2234 /*  Start functions for struct config_item_type tb_dev_cit */
2235 
2236 static inline struct se_device *to_device(struct config_item *item)
2237 {
2238 	return container_of(to_config_group(item), struct se_device, dev_group);
2239 }
2240 
2241 static ssize_t target_dev_info_show(struct config_item *item, char *page)
2242 {
2243 	struct se_device *dev = to_device(item);
2244 	int bl = 0;
2245 	ssize_t read_bytes = 0;
2246 
2247 	transport_dump_dev_state(dev, page, &bl);
2248 	read_bytes += bl;
2249 	read_bytes += dev->transport->show_configfs_dev_params(dev,
2250 			page+read_bytes);
2251 	return read_bytes;
2252 }
2253 
2254 static ssize_t target_dev_control_store(struct config_item *item,
2255 		const char *page, size_t count)
2256 {
2257 	struct se_device *dev = to_device(item);
2258 
2259 	return dev->transport->set_configfs_dev_params(dev, page, count);
2260 }
2261 
2262 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
2263 {
2264 	struct se_device *dev = to_device(item);
2265 
2266 	if (!(dev->dev_flags & DF_USING_ALIAS))
2267 		return 0;
2268 
2269 	return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
2270 }
2271 
2272 static ssize_t target_dev_alias_store(struct config_item *item,
2273 		const char *page, size_t count)
2274 {
2275 	struct se_device *dev = to_device(item);
2276 	struct se_hba *hba = dev->se_hba;
2277 	ssize_t read_bytes;
2278 
2279 	if (count > (SE_DEV_ALIAS_LEN-1)) {
2280 		pr_err("alias count: %d exceeds"
2281 			" SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
2282 			SE_DEV_ALIAS_LEN-1);
2283 		return -EINVAL;
2284 	}
2285 
2286 	read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
2287 	if (!read_bytes)
2288 		return -EINVAL;
2289 	if (dev->dev_alias[read_bytes - 1] == '\n')
2290 		dev->dev_alias[read_bytes - 1] = '\0';
2291 
2292 	dev->dev_flags |= DF_USING_ALIAS;
2293 
2294 	pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
2295 		config_item_name(&hba->hba_group.cg_item),
2296 		config_item_name(&dev->dev_group.cg_item),
2297 		dev->dev_alias);
2298 
2299 	return read_bytes;
2300 }
2301 
2302 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
2303 {
2304 	struct se_device *dev = to_device(item);
2305 
2306 	if (!(dev->dev_flags & DF_USING_UDEV_PATH))
2307 		return 0;
2308 
2309 	return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
2310 }
2311 
2312 static ssize_t target_dev_udev_path_store(struct config_item *item,
2313 		const char *page, size_t count)
2314 {
2315 	struct se_device *dev = to_device(item);
2316 	struct se_hba *hba = dev->se_hba;
2317 	ssize_t read_bytes;
2318 
2319 	if (count > (SE_UDEV_PATH_LEN-1)) {
2320 		pr_err("udev_path count: %d exceeds"
2321 			" SE_UDEV_PATH_LEN-1: %u\n", (int)count,
2322 			SE_UDEV_PATH_LEN-1);
2323 		return -EINVAL;
2324 	}
2325 
2326 	read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
2327 			"%s", page);
2328 	if (!read_bytes)
2329 		return -EINVAL;
2330 	if (dev->udev_path[read_bytes - 1] == '\n')
2331 		dev->udev_path[read_bytes - 1] = '\0';
2332 
2333 	dev->dev_flags |= DF_USING_UDEV_PATH;
2334 
2335 	pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
2336 		config_item_name(&hba->hba_group.cg_item),
2337 		config_item_name(&dev->dev_group.cg_item),
2338 		dev->udev_path);
2339 
2340 	return read_bytes;
2341 }
2342 
2343 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
2344 {
2345 	struct se_device *dev = to_device(item);
2346 
2347 	return snprintf(page, PAGE_SIZE, "%d\n", target_dev_configured(dev));
2348 }
2349 
2350 static ssize_t target_dev_enable_store(struct config_item *item,
2351 		const char *page, size_t count)
2352 {
2353 	struct se_device *dev = to_device(item);
2354 	char *ptr;
2355 	int ret;
2356 
2357 	ptr = strstr(page, "1");
2358 	if (!ptr) {
2359 		pr_err("For dev_enable ops, only valid value"
2360 				" is \"1\"\n");
2361 		return -EINVAL;
2362 	}
2363 
2364 	ret = target_configure_device(dev);
2365 	if (ret)
2366 		return ret;
2367 	return count;
2368 }
2369 
2370 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
2371 {
2372 	struct se_device *dev = to_device(item);
2373 	struct config_item *lu_ci;
2374 	struct t10_alua_lu_gp *lu_gp;
2375 	struct t10_alua_lu_gp_member *lu_gp_mem;
2376 	ssize_t len = 0;
2377 
2378 	lu_gp_mem = dev->dev_alua_lu_gp_mem;
2379 	if (!lu_gp_mem)
2380 		return 0;
2381 
2382 	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2383 	lu_gp = lu_gp_mem->lu_gp;
2384 	if (lu_gp) {
2385 		lu_ci = &lu_gp->lu_gp_group.cg_item;
2386 		len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
2387 			config_item_name(lu_ci), lu_gp->lu_gp_id);
2388 	}
2389 	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2390 
2391 	return len;
2392 }
2393 
2394 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
2395 		const char *page, size_t count)
2396 {
2397 	struct se_device *dev = to_device(item);
2398 	struct se_hba *hba = dev->se_hba;
2399 	struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2400 	struct t10_alua_lu_gp_member *lu_gp_mem;
2401 	unsigned char buf[LU_GROUP_NAME_BUF] = { };
2402 	int move = 0;
2403 
2404 	lu_gp_mem = dev->dev_alua_lu_gp_mem;
2405 	if (!lu_gp_mem)
2406 		return count;
2407 
2408 	if (count > LU_GROUP_NAME_BUF) {
2409 		pr_err("ALUA LU Group Alias too large!\n");
2410 		return -EINVAL;
2411 	}
2412 	memcpy(buf, page, count);
2413 	/*
2414 	 * Any ALUA logical unit alias besides "NULL" means we will be
2415 	 * making a new group association.
2416 	 */
2417 	if (strcmp(strstrip(buf), "NULL")) {
2418 		/*
2419 		 * core_alua_get_lu_gp_by_name() will increment reference to
2420 		 * struct t10_alua_lu_gp.  This reference is released with
2421 		 * core_alua_get_lu_gp_by_name below().
2422 		 */
2423 		lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2424 		if (!lu_gp_new)
2425 			return -ENODEV;
2426 	}
2427 
2428 	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2429 	lu_gp = lu_gp_mem->lu_gp;
2430 	if (lu_gp) {
2431 		/*
2432 		 * Clearing an existing lu_gp association, and replacing
2433 		 * with NULL
2434 		 */
2435 		if (!lu_gp_new) {
2436 			pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2437 				" from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2438 				" %hu\n",
2439 				config_item_name(&hba->hba_group.cg_item),
2440 				config_item_name(&dev->dev_group.cg_item),
2441 				config_item_name(&lu_gp->lu_gp_group.cg_item),
2442 				lu_gp->lu_gp_id);
2443 
2444 			__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2445 			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2446 
2447 			return count;
2448 		}
2449 		/*
2450 		 * Removing existing association of lu_gp_mem with lu_gp
2451 		 */
2452 		__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2453 		move = 1;
2454 	}
2455 	/*
2456 	 * Associate lu_gp_mem with lu_gp_new.
2457 	 */
2458 	__core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2459 	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2460 
2461 	pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2462 		" core/alua/lu_gps/%s, ID: %hu\n",
2463 		(move) ? "Moving" : "Adding",
2464 		config_item_name(&hba->hba_group.cg_item),
2465 		config_item_name(&dev->dev_group.cg_item),
2466 		config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2467 		lu_gp_new->lu_gp_id);
2468 
2469 	core_alua_put_lu_gp_from_name(lu_gp_new);
2470 	return count;
2471 }
2472 
2473 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2474 {
2475 	struct se_device *dev = to_device(item);
2476 	struct t10_alua_lba_map *map;
2477 	struct t10_alua_lba_map_member *mem;
2478 	char *b = page;
2479 	int bl = 0;
2480 	char state;
2481 
2482 	spin_lock(&dev->t10_alua.lba_map_lock);
2483 	if (!list_empty(&dev->t10_alua.lba_map_list))
2484 	    bl += sprintf(b + bl, "%u %u\n",
2485 			  dev->t10_alua.lba_map_segment_size,
2486 			  dev->t10_alua.lba_map_segment_multiplier);
2487 	list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2488 		bl += sprintf(b + bl, "%llu %llu",
2489 			      map->lba_map_first_lba, map->lba_map_last_lba);
2490 		list_for_each_entry(mem, &map->lba_map_mem_list,
2491 				    lba_map_mem_list) {
2492 			switch (mem->lba_map_mem_alua_state) {
2493 			case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2494 				state = 'O';
2495 				break;
2496 			case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2497 				state = 'A';
2498 				break;
2499 			case ALUA_ACCESS_STATE_STANDBY:
2500 				state = 'S';
2501 				break;
2502 			case ALUA_ACCESS_STATE_UNAVAILABLE:
2503 				state = 'U';
2504 				break;
2505 			default:
2506 				state = '.';
2507 				break;
2508 			}
2509 			bl += sprintf(b + bl, " %d:%c",
2510 				      mem->lba_map_mem_alua_pg_id, state);
2511 		}
2512 		bl += sprintf(b + bl, "\n");
2513 	}
2514 	spin_unlock(&dev->t10_alua.lba_map_lock);
2515 	return bl;
2516 }
2517 
2518 static ssize_t target_dev_lba_map_store(struct config_item *item,
2519 		const char *page, size_t count)
2520 {
2521 	struct se_device *dev = to_device(item);
2522 	struct t10_alua_lba_map *lba_map = NULL;
2523 	struct list_head lba_list;
2524 	char *map_entries, *orig, *ptr;
2525 	char state;
2526 	int pg_num = -1, pg;
2527 	int ret = 0, num = 0, pg_id, alua_state;
2528 	unsigned long start_lba = -1, end_lba = -1;
2529 	unsigned long segment_size = -1, segment_mult = -1;
2530 
2531 	orig = map_entries = kstrdup(page, GFP_KERNEL);
2532 	if (!map_entries)
2533 		return -ENOMEM;
2534 
2535 	INIT_LIST_HEAD(&lba_list);
2536 	while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2537 		if (!*ptr)
2538 			continue;
2539 
2540 		if (num == 0) {
2541 			if (sscanf(ptr, "%lu %lu\n",
2542 				   &segment_size, &segment_mult) != 2) {
2543 				pr_err("Invalid line %d\n", num);
2544 				ret = -EINVAL;
2545 				break;
2546 			}
2547 			num++;
2548 			continue;
2549 		}
2550 		if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2551 			pr_err("Invalid line %d\n", num);
2552 			ret = -EINVAL;
2553 			break;
2554 		}
2555 		ptr = strchr(ptr, ' ');
2556 		if (!ptr) {
2557 			pr_err("Invalid line %d, missing end lba\n", num);
2558 			ret = -EINVAL;
2559 			break;
2560 		}
2561 		ptr++;
2562 		ptr = strchr(ptr, ' ');
2563 		if (!ptr) {
2564 			pr_err("Invalid line %d, missing state definitions\n",
2565 			       num);
2566 			ret = -EINVAL;
2567 			break;
2568 		}
2569 		ptr++;
2570 		lba_map = core_alua_allocate_lba_map(&lba_list,
2571 						     start_lba, end_lba);
2572 		if (IS_ERR(lba_map)) {
2573 			ret = PTR_ERR(lba_map);
2574 			break;
2575 		}
2576 		pg = 0;
2577 		while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2578 			switch (state) {
2579 			case 'O':
2580 				alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2581 				break;
2582 			case 'A':
2583 				alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2584 				break;
2585 			case 'S':
2586 				alua_state = ALUA_ACCESS_STATE_STANDBY;
2587 				break;
2588 			case 'U':
2589 				alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2590 				break;
2591 			default:
2592 				pr_err("Invalid ALUA state '%c'\n", state);
2593 				ret = -EINVAL;
2594 				goto out;
2595 			}
2596 
2597 			ret = core_alua_allocate_lba_map_mem(lba_map,
2598 							     pg_id, alua_state);
2599 			if (ret) {
2600 				pr_err("Invalid target descriptor %d:%c "
2601 				       "at line %d\n",
2602 				       pg_id, state, num);
2603 				break;
2604 			}
2605 			pg++;
2606 			ptr = strchr(ptr, ' ');
2607 			if (ptr)
2608 				ptr++;
2609 			else
2610 				break;
2611 		}
2612 		if (pg_num == -1)
2613 		    pg_num = pg;
2614 		else if (pg != pg_num) {
2615 			pr_err("Only %d from %d port groups definitions "
2616 			       "at line %d\n", pg, pg_num, num);
2617 			ret = -EINVAL;
2618 			break;
2619 		}
2620 		num++;
2621 	}
2622 out:
2623 	if (ret) {
2624 		core_alua_free_lba_map(&lba_list);
2625 		count = ret;
2626 	} else
2627 		core_alua_set_lba_map(dev, &lba_list,
2628 				      segment_size, segment_mult);
2629 	kfree(orig);
2630 	return count;
2631 }
2632 
2633 CONFIGFS_ATTR_RO(target_dev_, info);
2634 CONFIGFS_ATTR_WO(target_dev_, control);
2635 CONFIGFS_ATTR(target_dev_, alias);
2636 CONFIGFS_ATTR(target_dev_, udev_path);
2637 CONFIGFS_ATTR(target_dev_, enable);
2638 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2639 CONFIGFS_ATTR(target_dev_, lba_map);
2640 
2641 static struct configfs_attribute *target_core_dev_attrs[] = {
2642 	&target_dev_attr_info,
2643 	&target_dev_attr_control,
2644 	&target_dev_attr_alias,
2645 	&target_dev_attr_udev_path,
2646 	&target_dev_attr_enable,
2647 	&target_dev_attr_alua_lu_gp,
2648 	&target_dev_attr_lba_map,
2649 	NULL,
2650 };
2651 
2652 static void target_core_dev_release(struct config_item *item)
2653 {
2654 	struct config_group *dev_cg = to_config_group(item);
2655 	struct se_device *dev =
2656 		container_of(dev_cg, struct se_device, dev_group);
2657 
2658 	target_free_device(dev);
2659 }
2660 
2661 /*
2662  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2663  * within target_fabric_port_link()
2664  */
2665 struct configfs_item_operations target_core_dev_item_ops = {
2666 	.release		= target_core_dev_release,
2667 };
2668 
2669 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2670 
2671 /* End functions for struct config_item_type tb_dev_cit */
2672 
2673 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2674 
2675 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2676 {
2677 	return container_of(to_config_group(item), struct t10_alua_lu_gp,
2678 			lu_gp_group);
2679 }
2680 
2681 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2682 {
2683 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2684 
2685 	if (!lu_gp->lu_gp_valid_id)
2686 		return 0;
2687 	return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2688 }
2689 
2690 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2691 		const char *page, size_t count)
2692 {
2693 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2694 	struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2695 	unsigned long lu_gp_id;
2696 	int ret;
2697 
2698 	ret = kstrtoul(page, 0, &lu_gp_id);
2699 	if (ret < 0) {
2700 		pr_err("kstrtoul() returned %d for"
2701 			" lu_gp_id\n", ret);
2702 		return ret;
2703 	}
2704 	if (lu_gp_id > 0x0000ffff) {
2705 		pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2706 			" 0x0000ffff\n", lu_gp_id);
2707 		return -EINVAL;
2708 	}
2709 
2710 	ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2711 	if (ret < 0)
2712 		return -EINVAL;
2713 
2714 	pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2715 		" Group: core/alua/lu_gps/%s to ID: %hu\n",
2716 		config_item_name(&alua_lu_gp_cg->cg_item),
2717 		lu_gp->lu_gp_id);
2718 
2719 	return count;
2720 }
2721 
2722 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2723 {
2724 	struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2725 	struct se_device *dev;
2726 	struct se_hba *hba;
2727 	struct t10_alua_lu_gp_member *lu_gp_mem;
2728 	ssize_t len = 0, cur_len;
2729 	unsigned char buf[LU_GROUP_NAME_BUF] = { };
2730 
2731 	spin_lock(&lu_gp->lu_gp_lock);
2732 	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2733 		dev = lu_gp_mem->lu_gp_mem_dev;
2734 		hba = dev->se_hba;
2735 
2736 		cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2737 			config_item_name(&hba->hba_group.cg_item),
2738 			config_item_name(&dev->dev_group.cg_item));
2739 		cur_len++; /* Extra byte for NULL terminator */
2740 
2741 		if ((cur_len + len) > PAGE_SIZE) {
2742 			pr_warn("Ran out of lu_gp_show_attr"
2743 				"_members buffer\n");
2744 			break;
2745 		}
2746 		memcpy(page+len, buf, cur_len);
2747 		len += cur_len;
2748 	}
2749 	spin_unlock(&lu_gp->lu_gp_lock);
2750 
2751 	return len;
2752 }
2753 
2754 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2755 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2756 
2757 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2758 	&target_lu_gp_attr_lu_gp_id,
2759 	&target_lu_gp_attr_members,
2760 	NULL,
2761 };
2762 
2763 static void target_core_alua_lu_gp_release(struct config_item *item)
2764 {
2765 	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2766 			struct t10_alua_lu_gp, lu_gp_group);
2767 
2768 	core_alua_free_lu_gp(lu_gp);
2769 }
2770 
2771 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2772 	.release		= target_core_alua_lu_gp_release,
2773 };
2774 
2775 static const struct config_item_type target_core_alua_lu_gp_cit = {
2776 	.ct_item_ops		= &target_core_alua_lu_gp_ops,
2777 	.ct_attrs		= target_core_alua_lu_gp_attrs,
2778 	.ct_owner		= THIS_MODULE,
2779 };
2780 
2781 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2782 
2783 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2784 
2785 static struct config_group *target_core_alua_create_lu_gp(
2786 	struct config_group *group,
2787 	const char *name)
2788 {
2789 	struct t10_alua_lu_gp *lu_gp;
2790 	struct config_group *alua_lu_gp_cg = NULL;
2791 	struct config_item *alua_lu_gp_ci = NULL;
2792 
2793 	lu_gp = core_alua_allocate_lu_gp(name, 0);
2794 	if (IS_ERR(lu_gp))
2795 		return NULL;
2796 
2797 	alua_lu_gp_cg = &lu_gp->lu_gp_group;
2798 	alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2799 
2800 	config_group_init_type_name(alua_lu_gp_cg, name,
2801 			&target_core_alua_lu_gp_cit);
2802 
2803 	pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2804 		" Group: core/alua/lu_gps/%s\n",
2805 		config_item_name(alua_lu_gp_ci));
2806 
2807 	return alua_lu_gp_cg;
2808 
2809 }
2810 
2811 static void target_core_alua_drop_lu_gp(
2812 	struct config_group *group,
2813 	struct config_item *item)
2814 {
2815 	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2816 			struct t10_alua_lu_gp, lu_gp_group);
2817 
2818 	pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2819 		" Group: core/alua/lu_gps/%s, ID: %hu\n",
2820 		config_item_name(item), lu_gp->lu_gp_id);
2821 	/*
2822 	 * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2823 	 * -> target_core_alua_lu_gp_release()
2824 	 */
2825 	config_item_put(item);
2826 }
2827 
2828 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2829 	.make_group		= &target_core_alua_create_lu_gp,
2830 	.drop_item		= &target_core_alua_drop_lu_gp,
2831 };
2832 
2833 static const struct config_item_type target_core_alua_lu_gps_cit = {
2834 	.ct_item_ops		= NULL,
2835 	.ct_group_ops		= &target_core_alua_lu_gps_group_ops,
2836 	.ct_owner		= THIS_MODULE,
2837 };
2838 
2839 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2840 
2841 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2842 
2843 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2844 {
2845 	return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2846 			tg_pt_gp_group);
2847 }
2848 
2849 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2850 		char *page)
2851 {
2852 	return sprintf(page, "%d\n",
2853 		       to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2854 }
2855 
2856 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2857 		const char *page, size_t count)
2858 {
2859 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2860 	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2861 	unsigned long tmp;
2862 	int new_state, ret;
2863 
2864 	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2865 		pr_err("Unable to do implicit ALUA on invalid tg_pt_gp ID\n");
2866 		return -EINVAL;
2867 	}
2868 	if (!target_dev_configured(dev)) {
2869 		pr_err("Unable to set alua_access_state while device is"
2870 		       " not configured\n");
2871 		return -ENODEV;
2872 	}
2873 
2874 	ret = kstrtoul(page, 0, &tmp);
2875 	if (ret < 0) {
2876 		pr_err("Unable to extract new ALUA access state from"
2877 				" %s\n", page);
2878 		return ret;
2879 	}
2880 	new_state = (int)tmp;
2881 
2882 	if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2883 		pr_err("Unable to process implicit configfs ALUA"
2884 			" transition while TPGS_IMPLICIT_ALUA is disabled\n");
2885 		return -EINVAL;
2886 	}
2887 	if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2888 	    new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2889 		/* LBA DEPENDENT is only allowed with implicit ALUA */
2890 		pr_err("Unable to process implicit configfs ALUA transition"
2891 		       " while explicit ALUA management is enabled\n");
2892 		return -EINVAL;
2893 	}
2894 
2895 	ret = core_alua_do_port_transition(tg_pt_gp, dev,
2896 					NULL, NULL, new_state, 0);
2897 	return (!ret) ? count : -EINVAL;
2898 }
2899 
2900 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2901 		char *page)
2902 {
2903 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2904 	return sprintf(page, "%s\n",
2905 		core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2906 }
2907 
2908 static ssize_t target_tg_pt_gp_alua_access_status_store(
2909 		struct config_item *item, const char *page, size_t count)
2910 {
2911 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2912 	unsigned long tmp;
2913 	int new_status, ret;
2914 
2915 	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2916 		pr_err("Unable to set ALUA access status on invalid tg_pt_gp ID\n");
2917 		return -EINVAL;
2918 	}
2919 
2920 	ret = kstrtoul(page, 0, &tmp);
2921 	if (ret < 0) {
2922 		pr_err("Unable to extract new ALUA access status"
2923 				" from %s\n", page);
2924 		return ret;
2925 	}
2926 	new_status = (int)tmp;
2927 
2928 	if ((new_status != ALUA_STATUS_NONE) &&
2929 	    (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2930 	    (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2931 		pr_err("Illegal ALUA access status: 0x%02x\n",
2932 				new_status);
2933 		return -EINVAL;
2934 	}
2935 
2936 	tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2937 	return count;
2938 }
2939 
2940 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2941 		char *page)
2942 {
2943 	return core_alua_show_access_type(to_tg_pt_gp(item), page);
2944 }
2945 
2946 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2947 		const char *page, size_t count)
2948 {
2949 	return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2950 }
2951 
2952 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)				\
2953 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(		\
2954 		struct config_item *item, char *p)			\
2955 {									\
2956 	struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);		\
2957 	return sprintf(p, "%d\n",					\
2958 		!!(t->tg_pt_gp_alua_supported_states & _bit));		\
2959 }									\
2960 									\
2961 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(		\
2962 		struct config_item *item, const char *p, size_t c)	\
2963 {									\
2964 	struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);		\
2965 	unsigned long tmp;						\
2966 	int ret;							\
2967 									\
2968 	if (!t->tg_pt_gp_valid_id) {					\
2969 		pr_err("Unable to set " #_name " ALUA state on invalid tg_pt_gp ID\n"); \
2970 		return -EINVAL;						\
2971 	}								\
2972 									\
2973 	ret = kstrtoul(p, 0, &tmp);					\
2974 	if (ret < 0) {							\
2975 		pr_err("Invalid value '%s', must be '0' or '1'\n", p);	\
2976 		return -EINVAL;						\
2977 	}								\
2978 	if (tmp > 1) {							\
2979 		pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2980 		return -EINVAL;						\
2981 	}								\
2982 	if (tmp)							\
2983 		t->tg_pt_gp_alua_supported_states |= _bit;		\
2984 	else								\
2985 		t->tg_pt_gp_alua_supported_states &= ~_bit;		\
2986 									\
2987 	return c;							\
2988 }
2989 
2990 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2991 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2992 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2993 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2994 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2995 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2996 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2997 
2998 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2999 		struct config_item *item, char *page)
3000 {
3001 	return sprintf(page, "%d\n",
3002 		to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
3003 }
3004 
3005 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
3006 		struct config_item *item, const char *page, size_t count)
3007 {
3008 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3009 	unsigned long tmp;
3010 	int ret;
3011 
3012 	ret = kstrtoul(page, 0, &tmp);
3013 	if (ret < 0) {
3014 		pr_err("Unable to extract alua_write_metadata\n");
3015 		return ret;
3016 	}
3017 
3018 	if ((tmp != 0) && (tmp != 1)) {
3019 		pr_err("Illegal value for alua_write_metadata:"
3020 			" %lu\n", tmp);
3021 		return -EINVAL;
3022 	}
3023 	tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
3024 
3025 	return count;
3026 }
3027 
3028 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
3029 		char *page)
3030 {
3031 	return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
3032 }
3033 
3034 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
3035 		const char *page, size_t count)
3036 {
3037 	return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
3038 			count);
3039 }
3040 
3041 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
3042 		char *page)
3043 {
3044 	return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
3045 }
3046 
3047 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
3048 		const char *page, size_t count)
3049 {
3050 	return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
3051 			count);
3052 }
3053 
3054 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
3055 		struct config_item *item, char *page)
3056 {
3057 	return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
3058 }
3059 
3060 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
3061 		struct config_item *item, const char *page, size_t count)
3062 {
3063 	return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
3064 			count);
3065 }
3066 
3067 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
3068 		char *page)
3069 {
3070 	return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
3071 }
3072 
3073 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
3074 		const char *page, size_t count)
3075 {
3076 	return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
3077 }
3078 
3079 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
3080 		char *page)
3081 {
3082 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3083 
3084 	if (!tg_pt_gp->tg_pt_gp_valid_id)
3085 		return 0;
3086 	return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
3087 }
3088 
3089 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
3090 		const char *page, size_t count)
3091 {
3092 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3093 	struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3094 	unsigned long tg_pt_gp_id;
3095 	int ret;
3096 
3097 	ret = kstrtoul(page, 0, &tg_pt_gp_id);
3098 	if (ret < 0) {
3099 		pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
3100 		       page);
3101 		return ret;
3102 	}
3103 	if (tg_pt_gp_id > 0x0000ffff) {
3104 		pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
3105 		       tg_pt_gp_id);
3106 		return -EINVAL;
3107 	}
3108 
3109 	ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
3110 	if (ret < 0)
3111 		return -EINVAL;
3112 
3113 	pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
3114 		"core/alua/tg_pt_gps/%s to ID: %hu\n",
3115 		config_item_name(&alua_tg_pt_gp_cg->cg_item),
3116 		tg_pt_gp->tg_pt_gp_id);
3117 
3118 	return count;
3119 }
3120 
3121 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
3122 		char *page)
3123 {
3124 	struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3125 	struct se_lun *lun;
3126 	ssize_t len = 0, cur_len;
3127 	unsigned char buf[TG_PT_GROUP_NAME_BUF] = { };
3128 
3129 	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
3130 	list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
3131 			lun_tg_pt_gp_link) {
3132 		struct se_portal_group *tpg = lun->lun_tpg;
3133 
3134 		cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
3135 			"/%s\n", tpg->se_tpg_tfo->fabric_name,
3136 			tpg->se_tpg_tfo->tpg_get_wwn(tpg),
3137 			tpg->se_tpg_tfo->tpg_get_tag(tpg),
3138 			config_item_name(&lun->lun_group.cg_item));
3139 		cur_len++; /* Extra byte for NULL terminator */
3140 
3141 		if ((cur_len + len) > PAGE_SIZE) {
3142 			pr_warn("Ran out of lu_gp_show_attr"
3143 				"_members buffer\n");
3144 			break;
3145 		}
3146 		memcpy(page+len, buf, cur_len);
3147 		len += cur_len;
3148 	}
3149 	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
3150 
3151 	return len;
3152 }
3153 
3154 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
3155 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
3156 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
3157 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
3158 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
3159 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
3160 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
3161 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
3162 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
3163 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
3164 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
3165 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
3166 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
3167 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
3168 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
3169 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
3170 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
3171 
3172 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
3173 	&target_tg_pt_gp_attr_alua_access_state,
3174 	&target_tg_pt_gp_attr_alua_access_status,
3175 	&target_tg_pt_gp_attr_alua_access_type,
3176 	&target_tg_pt_gp_attr_alua_support_transitioning,
3177 	&target_tg_pt_gp_attr_alua_support_offline,
3178 	&target_tg_pt_gp_attr_alua_support_lba_dependent,
3179 	&target_tg_pt_gp_attr_alua_support_unavailable,
3180 	&target_tg_pt_gp_attr_alua_support_standby,
3181 	&target_tg_pt_gp_attr_alua_support_active_nonoptimized,
3182 	&target_tg_pt_gp_attr_alua_support_active_optimized,
3183 	&target_tg_pt_gp_attr_alua_write_metadata,
3184 	&target_tg_pt_gp_attr_nonop_delay_msecs,
3185 	&target_tg_pt_gp_attr_trans_delay_msecs,
3186 	&target_tg_pt_gp_attr_implicit_trans_secs,
3187 	&target_tg_pt_gp_attr_preferred,
3188 	&target_tg_pt_gp_attr_tg_pt_gp_id,
3189 	&target_tg_pt_gp_attr_members,
3190 	NULL,
3191 };
3192 
3193 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
3194 {
3195 	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3196 			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3197 
3198 	core_alua_free_tg_pt_gp(tg_pt_gp);
3199 }
3200 
3201 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
3202 	.release		= target_core_alua_tg_pt_gp_release,
3203 };
3204 
3205 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
3206 	.ct_item_ops		= &target_core_alua_tg_pt_gp_ops,
3207 	.ct_attrs		= target_core_alua_tg_pt_gp_attrs,
3208 	.ct_owner		= THIS_MODULE,
3209 };
3210 
3211 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
3212 
3213 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3214 
3215 static struct config_group *target_core_alua_create_tg_pt_gp(
3216 	struct config_group *group,
3217 	const char *name)
3218 {
3219 	struct t10_alua *alua = container_of(group, struct t10_alua,
3220 					alua_tg_pt_gps_group);
3221 	struct t10_alua_tg_pt_gp *tg_pt_gp;
3222 	struct config_group *alua_tg_pt_gp_cg = NULL;
3223 	struct config_item *alua_tg_pt_gp_ci = NULL;
3224 
3225 	tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
3226 	if (!tg_pt_gp)
3227 		return NULL;
3228 
3229 	alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3230 	alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
3231 
3232 	config_group_init_type_name(alua_tg_pt_gp_cg, name,
3233 			&target_core_alua_tg_pt_gp_cit);
3234 
3235 	pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
3236 		" Group: alua/tg_pt_gps/%s\n",
3237 		config_item_name(alua_tg_pt_gp_ci));
3238 
3239 	return alua_tg_pt_gp_cg;
3240 }
3241 
3242 static void target_core_alua_drop_tg_pt_gp(
3243 	struct config_group *group,
3244 	struct config_item *item)
3245 {
3246 	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3247 			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3248 
3249 	pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
3250 		" Group: alua/tg_pt_gps/%s, ID: %hu\n",
3251 		config_item_name(item), tg_pt_gp->tg_pt_gp_id);
3252 	/*
3253 	 * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
3254 	 * -> target_core_alua_tg_pt_gp_release().
3255 	 */
3256 	config_item_put(item);
3257 }
3258 
3259 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
3260 	.make_group		= &target_core_alua_create_tg_pt_gp,
3261 	.drop_item		= &target_core_alua_drop_tg_pt_gp,
3262 };
3263 
3264 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
3265 
3266 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3267 
3268 /* Start functions for struct config_item_type target_core_alua_cit */
3269 
3270 /*
3271  * target_core_alua_cit is a ConfigFS group that lives under
3272  * /sys/kernel/config/target/core/alua.  There are default groups
3273  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
3274  * target_core_alua_cit in target_core_init_configfs() below.
3275  */
3276 static const struct config_item_type target_core_alua_cit = {
3277 	.ct_item_ops		= NULL,
3278 	.ct_attrs		= NULL,
3279 	.ct_owner		= THIS_MODULE,
3280 };
3281 
3282 /* End functions for struct config_item_type target_core_alua_cit */
3283 
3284 /* Start functions for struct config_item_type tb_dev_stat_cit */
3285 
3286 static struct config_group *target_core_stat_mkdir(
3287 	struct config_group *group,
3288 	const char *name)
3289 {
3290 	return ERR_PTR(-ENOSYS);
3291 }
3292 
3293 static void target_core_stat_rmdir(
3294 	struct config_group *group,
3295 	struct config_item *item)
3296 {
3297 	return;
3298 }
3299 
3300 static struct configfs_group_operations target_core_stat_group_ops = {
3301 	.make_group		= &target_core_stat_mkdir,
3302 	.drop_item		= &target_core_stat_rmdir,
3303 };
3304 
3305 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
3306 
3307 /* End functions for struct config_item_type tb_dev_stat_cit */
3308 
3309 /* Start functions for struct config_item_type target_core_hba_cit */
3310 
3311 static struct config_group *target_core_make_subdev(
3312 	struct config_group *group,
3313 	const char *name)
3314 {
3315 	struct t10_alua_tg_pt_gp *tg_pt_gp;
3316 	struct config_item *hba_ci = &group->cg_item;
3317 	struct se_hba *hba = item_to_hba(hba_ci);
3318 	struct target_backend *tb = hba->backend;
3319 	struct se_device *dev;
3320 	int errno = -ENOMEM, ret;
3321 
3322 	ret = mutex_lock_interruptible(&hba->hba_access_mutex);
3323 	if (ret)
3324 		return ERR_PTR(ret);
3325 
3326 	dev = target_alloc_device(hba, name);
3327 	if (!dev)
3328 		goto out_unlock;
3329 
3330 	config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
3331 
3332 	config_group_init_type_name(&dev->dev_action_group, "action",
3333 			&tb->tb_dev_action_cit);
3334 	configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
3335 
3336 	config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
3337 			&tb->tb_dev_attrib_cit);
3338 	configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
3339 
3340 	config_group_init_type_name(&dev->dev_pr_group, "pr",
3341 			&tb->tb_dev_pr_cit);
3342 	configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
3343 
3344 	config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
3345 			&tb->tb_dev_wwn_cit);
3346 	configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
3347 			&dev->dev_group);
3348 
3349 	config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
3350 			"alua", &tb->tb_dev_alua_tg_pt_gps_cit);
3351 	configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
3352 			&dev->dev_group);
3353 
3354 	config_group_init_type_name(&dev->dev_stat_grps.stat_group,
3355 			"statistics", &tb->tb_dev_stat_cit);
3356 	configfs_add_default_group(&dev->dev_stat_grps.stat_group,
3357 			&dev->dev_group);
3358 
3359 	/*
3360 	 * Add core/$HBA/$DEV/alua/default_tg_pt_gp
3361 	 */
3362 	tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
3363 	if (!tg_pt_gp)
3364 		goto out_free_device;
3365 	dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
3366 
3367 	config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
3368 			"default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
3369 	configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
3370 			&dev->t10_alua.alua_tg_pt_gps_group);
3371 
3372 	/*
3373 	 * Add core/$HBA/$DEV/statistics/ default groups
3374 	 */
3375 	target_stat_setup_dev_default_groups(dev);
3376 
3377 	mutex_lock(&target_devices_lock);
3378 	target_devices++;
3379 	mutex_unlock(&target_devices_lock);
3380 
3381 	mutex_unlock(&hba->hba_access_mutex);
3382 	return &dev->dev_group;
3383 
3384 out_free_device:
3385 	target_free_device(dev);
3386 out_unlock:
3387 	mutex_unlock(&hba->hba_access_mutex);
3388 	return ERR_PTR(errno);
3389 }
3390 
3391 static void target_core_drop_subdev(
3392 	struct config_group *group,
3393 	struct config_item *item)
3394 {
3395 	struct config_group *dev_cg = to_config_group(item);
3396 	struct se_device *dev =
3397 		container_of(dev_cg, struct se_device, dev_group);
3398 	struct se_hba *hba;
3399 
3400 	hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3401 
3402 	mutex_lock(&hba->hba_access_mutex);
3403 
3404 	configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3405 	configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3406 
3407 	/*
3408 	 * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3409 	 * directly from target_core_alua_tg_pt_gp_release().
3410 	 */
3411 	dev->t10_alua.default_tg_pt_gp = NULL;
3412 
3413 	configfs_remove_default_groups(dev_cg);
3414 
3415 	/*
3416 	 * se_dev is released from target_core_dev_item_ops->release()
3417 	 */
3418 	config_item_put(item);
3419 
3420 	mutex_lock(&target_devices_lock);
3421 	target_devices--;
3422 	mutex_unlock(&target_devices_lock);
3423 
3424 	mutex_unlock(&hba->hba_access_mutex);
3425 }
3426 
3427 static struct configfs_group_operations target_core_hba_group_ops = {
3428 	.make_group		= target_core_make_subdev,
3429 	.drop_item		= target_core_drop_subdev,
3430 };
3431 
3432 
3433 static inline struct se_hba *to_hba(struct config_item *item)
3434 {
3435 	return container_of(to_config_group(item), struct se_hba, hba_group);
3436 }
3437 
3438 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3439 {
3440 	struct se_hba *hba = to_hba(item);
3441 
3442 	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3443 			hba->hba_id, hba->backend->ops->name,
3444 			TARGET_CORE_VERSION);
3445 }
3446 
3447 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3448 {
3449 	struct se_hba *hba = to_hba(item);
3450 	int hba_mode = 0;
3451 
3452 	if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3453 		hba_mode = 1;
3454 
3455 	return sprintf(page, "%d\n", hba_mode);
3456 }
3457 
3458 static ssize_t target_hba_mode_store(struct config_item *item,
3459 		const char *page, size_t count)
3460 {
3461 	struct se_hba *hba = to_hba(item);
3462 	unsigned long mode_flag;
3463 	int ret;
3464 
3465 	if (hba->backend->ops->pmode_enable_hba == NULL)
3466 		return -EINVAL;
3467 
3468 	ret = kstrtoul(page, 0, &mode_flag);
3469 	if (ret < 0) {
3470 		pr_err("Unable to extract hba mode flag: %d\n", ret);
3471 		return ret;
3472 	}
3473 
3474 	if (hba->dev_count) {
3475 		pr_err("Unable to set hba_mode with active devices\n");
3476 		return -EINVAL;
3477 	}
3478 
3479 	ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3480 	if (ret < 0)
3481 		return -EINVAL;
3482 	if (ret > 0)
3483 		hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3484 	else if (ret == 0)
3485 		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3486 
3487 	return count;
3488 }
3489 
3490 CONFIGFS_ATTR_RO(target_, hba_info);
3491 CONFIGFS_ATTR(target_, hba_mode);
3492 
3493 static void target_core_hba_release(struct config_item *item)
3494 {
3495 	struct se_hba *hba = container_of(to_config_group(item),
3496 				struct se_hba, hba_group);
3497 	core_delete_hba(hba);
3498 }
3499 
3500 static struct configfs_attribute *target_core_hba_attrs[] = {
3501 	&target_attr_hba_info,
3502 	&target_attr_hba_mode,
3503 	NULL,
3504 };
3505 
3506 static struct configfs_item_operations target_core_hba_item_ops = {
3507 	.release		= target_core_hba_release,
3508 };
3509 
3510 static const struct config_item_type target_core_hba_cit = {
3511 	.ct_item_ops		= &target_core_hba_item_ops,
3512 	.ct_group_ops		= &target_core_hba_group_ops,
3513 	.ct_attrs		= target_core_hba_attrs,
3514 	.ct_owner		= THIS_MODULE,
3515 };
3516 
3517 static struct config_group *target_core_call_addhbatotarget(
3518 	struct config_group *group,
3519 	const char *name)
3520 {
3521 	char *se_plugin_str, *str, *str2;
3522 	struct se_hba *hba;
3523 	char buf[TARGET_CORE_NAME_MAX_LEN] = { };
3524 	unsigned long plugin_dep_id = 0;
3525 	int ret;
3526 
3527 	if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3528 		pr_err("Passed *name strlen(): %d exceeds"
3529 			" TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3530 			TARGET_CORE_NAME_MAX_LEN);
3531 		return ERR_PTR(-ENAMETOOLONG);
3532 	}
3533 	snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3534 
3535 	str = strstr(buf, "_");
3536 	if (!str) {
3537 		pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3538 		return ERR_PTR(-EINVAL);
3539 	}
3540 	se_plugin_str = buf;
3541 	/*
3542 	 * Special case for subsystem plugins that have "_" in their names.
3543 	 * Namely rd_direct and rd_mcp..
3544 	 */
3545 	str2 = strstr(str+1, "_");
3546 	if (str2) {
3547 		*str2 = '\0'; /* Terminate for *se_plugin_str */
3548 		str2++; /* Skip to start of plugin dependent ID */
3549 		str = str2;
3550 	} else {
3551 		*str = '\0'; /* Terminate for *se_plugin_str */
3552 		str++; /* Skip to start of plugin dependent ID */
3553 	}
3554 
3555 	ret = kstrtoul(str, 0, &plugin_dep_id);
3556 	if (ret < 0) {
3557 		pr_err("kstrtoul() returned %d for"
3558 				" plugin_dep_id\n", ret);
3559 		return ERR_PTR(ret);
3560 	}
3561 	/*
3562 	 * Load up TCM subsystem plugins if they have not already been loaded.
3563 	 */
3564 	transport_subsystem_check_init();
3565 
3566 	hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3567 	if (IS_ERR(hba))
3568 		return ERR_CAST(hba);
3569 
3570 	config_group_init_type_name(&hba->hba_group, name,
3571 			&target_core_hba_cit);
3572 
3573 	return &hba->hba_group;
3574 }
3575 
3576 static void target_core_call_delhbafromtarget(
3577 	struct config_group *group,
3578 	struct config_item *item)
3579 {
3580 	/*
3581 	 * core_delete_hba() is called from target_core_hba_item_ops->release()
3582 	 * -> target_core_hba_release()
3583 	 */
3584 	config_item_put(item);
3585 }
3586 
3587 static struct configfs_group_operations target_core_group_ops = {
3588 	.make_group	= target_core_call_addhbatotarget,
3589 	.drop_item	= target_core_call_delhbafromtarget,
3590 };
3591 
3592 static const struct config_item_type target_core_cit = {
3593 	.ct_item_ops	= NULL,
3594 	.ct_group_ops	= &target_core_group_ops,
3595 	.ct_attrs	= NULL,
3596 	.ct_owner	= THIS_MODULE,
3597 };
3598 
3599 /* Stop functions for struct config_item_type target_core_hba_cit */
3600 
3601 void target_setup_backend_cits(struct target_backend *tb)
3602 {
3603 	target_core_setup_dev_cit(tb);
3604 	target_core_setup_dev_action_cit(tb);
3605 	target_core_setup_dev_attrib_cit(tb);
3606 	target_core_setup_dev_pr_cit(tb);
3607 	target_core_setup_dev_wwn_cit(tb);
3608 	target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3609 	target_core_setup_dev_stat_cit(tb);
3610 }
3611 
3612 static void target_init_dbroot(void)
3613 {
3614 	struct file *fp;
3615 
3616 	snprintf(db_root_stage, DB_ROOT_LEN, DB_ROOT_PREFERRED);
3617 	fp = filp_open(db_root_stage, O_RDONLY, 0);
3618 	if (IS_ERR(fp)) {
3619 		pr_err("db_root: cannot open: %s\n", db_root_stage);
3620 		return;
3621 	}
3622 	if (!S_ISDIR(file_inode(fp)->i_mode)) {
3623 		filp_close(fp, NULL);
3624 		pr_err("db_root: not a valid directory: %s\n", db_root_stage);
3625 		return;
3626 	}
3627 	filp_close(fp, NULL);
3628 
3629 	strncpy(db_root, db_root_stage, DB_ROOT_LEN);
3630 	pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
3631 }
3632 
3633 static int __init target_core_init_configfs(void)
3634 {
3635 	struct configfs_subsystem *subsys = &target_core_fabrics;
3636 	struct t10_alua_lu_gp *lu_gp;
3637 	int ret;
3638 
3639 	pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3640 		" Engine: %s on %s/%s on "UTS_RELEASE"\n",
3641 		TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3642 
3643 	config_group_init(&subsys->su_group);
3644 	mutex_init(&subsys->su_mutex);
3645 
3646 	ret = init_se_kmem_caches();
3647 	if (ret < 0)
3648 		return ret;
3649 	/*
3650 	 * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3651 	 * and ALUA Logical Unit Group and Target Port Group infrastructure.
3652 	 */
3653 	config_group_init_type_name(&target_core_hbagroup, "core",
3654 			&target_core_cit);
3655 	configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3656 
3657 	/*
3658 	 * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3659 	 */
3660 	config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3661 	configfs_add_default_group(&alua_group, &target_core_hbagroup);
3662 
3663 	/*
3664 	 * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3665 	 * groups under /sys/kernel/config/target/core/alua/
3666 	 */
3667 	config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3668 			&target_core_alua_lu_gps_cit);
3669 	configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3670 
3671 	/*
3672 	 * Add core/alua/lu_gps/default_lu_gp
3673 	 */
3674 	lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3675 	if (IS_ERR(lu_gp)) {
3676 		ret = -ENOMEM;
3677 		goto out_global;
3678 	}
3679 
3680 	config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3681 				&target_core_alua_lu_gp_cit);
3682 	configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3683 
3684 	default_lu_gp = lu_gp;
3685 
3686 	/*
3687 	 * Register the target_core_mod subsystem with configfs.
3688 	 */
3689 	ret = configfs_register_subsystem(subsys);
3690 	if (ret < 0) {
3691 		pr_err("Error %d while registering subsystem %s\n",
3692 			ret, subsys->su_group.cg_item.ci_namebuf);
3693 		goto out_global;
3694 	}
3695 	pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3696 		" Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3697 		" on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3698 	/*
3699 	 * Register built-in RAMDISK subsystem logic for virtual LUN 0
3700 	 */
3701 	ret = rd_module_init();
3702 	if (ret < 0)
3703 		goto out;
3704 
3705 	ret = core_dev_setup_virtual_lun0();
3706 	if (ret < 0)
3707 		goto out;
3708 
3709 	ret = target_xcopy_setup_pt();
3710 	if (ret < 0)
3711 		goto out;
3712 
3713 	target_init_dbroot();
3714 
3715 	return 0;
3716 
3717 out:
3718 	configfs_unregister_subsystem(subsys);
3719 	core_dev_release_virtual_lun0();
3720 	rd_module_exit();
3721 out_global:
3722 	if (default_lu_gp) {
3723 		core_alua_free_lu_gp(default_lu_gp);
3724 		default_lu_gp = NULL;
3725 	}
3726 	release_se_kmem_caches();
3727 	return ret;
3728 }
3729 
3730 static void __exit target_core_exit_configfs(void)
3731 {
3732 	configfs_remove_default_groups(&alua_lu_gps_group);
3733 	configfs_remove_default_groups(&alua_group);
3734 	configfs_remove_default_groups(&target_core_hbagroup);
3735 
3736 	/*
3737 	 * We expect subsys->su_group.default_groups to be released
3738 	 * by configfs subsystem provider logic..
3739 	 */
3740 	configfs_unregister_subsystem(&target_core_fabrics);
3741 
3742 	core_alua_free_lu_gp(default_lu_gp);
3743 	default_lu_gp = NULL;
3744 
3745 	pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3746 			" Infrastructure\n");
3747 
3748 	core_dev_release_virtual_lun0();
3749 	rd_module_exit();
3750 	target_xcopy_release_pt();
3751 	release_se_kmem_caches();
3752 }
3753 
3754 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3755 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3756 MODULE_LICENSE("GPL");
3757 
3758 module_init(target_core_init_configfs);
3759 module_exit(target_core_exit_configfs);
3760