1/*
2 * Copyright (C) 2007 Oracle.  All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/spinlock.h>
22#include <linux/completion.h>
23#include <linux/buffer_head.h>
24#include <linux/kobject.h>
25#include <linux/bug.h>
26#include <linux/genhd.h>
27#include <linux/debugfs.h>
28
29#include "ctree.h"
30#include "disk-io.h"
31#include "transaction.h"
32#include "sysfs.h"
33#include "volumes.h"
34
35static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
36
37static u64 get_features(struct btrfs_fs_info *fs_info,
38			enum btrfs_feature_set set)
39{
40	struct btrfs_super_block *disk_super = fs_info->super_copy;
41	if (set == FEAT_COMPAT)
42		return btrfs_super_compat_flags(disk_super);
43	else if (set == FEAT_COMPAT_RO)
44		return btrfs_super_compat_ro_flags(disk_super);
45	else
46		return btrfs_super_incompat_flags(disk_super);
47}
48
49static void set_features(struct btrfs_fs_info *fs_info,
50			 enum btrfs_feature_set set, u64 features)
51{
52	struct btrfs_super_block *disk_super = fs_info->super_copy;
53	if (set == FEAT_COMPAT)
54		btrfs_set_super_compat_flags(disk_super, features);
55	else if (set == FEAT_COMPAT_RO)
56		btrfs_set_super_compat_ro_flags(disk_super, features);
57	else
58		btrfs_set_super_incompat_flags(disk_super, features);
59}
60
61static int can_modify_feature(struct btrfs_feature_attr *fa)
62{
63	int val = 0;
64	u64 set, clear;
65	switch (fa->feature_set) {
66	case FEAT_COMPAT:
67		set = BTRFS_FEATURE_COMPAT_SAFE_SET;
68		clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
69		break;
70	case FEAT_COMPAT_RO:
71		set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
72		clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
73		break;
74	case FEAT_INCOMPAT:
75		set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
76		clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
77		break;
78	default:
79		printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n",
80				fa->feature_set);
81		return 0;
82	}
83
84	if (set & fa->feature_bit)
85		val |= 1;
86	if (clear & fa->feature_bit)
87		val |= 2;
88
89	return val;
90}
91
92static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
93				       struct kobj_attribute *a, char *buf)
94{
95	int val = 0;
96	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
97	struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
98	if (fs_info) {
99		u64 features = get_features(fs_info, fa->feature_set);
100		if (features & fa->feature_bit)
101			val = 1;
102	} else
103		val = can_modify_feature(fa);
104
105	return snprintf(buf, PAGE_SIZE, "%d\n", val);
106}
107
108static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
109					struct kobj_attribute *a,
110					const char *buf, size_t count)
111{
112	struct btrfs_fs_info *fs_info;
113	struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
114	u64 features, set, clear;
115	unsigned long val;
116	int ret;
117
118	fs_info = to_fs_info(kobj);
119	if (!fs_info)
120		return -EPERM;
121
122	ret = kstrtoul(skip_spaces(buf), 0, &val);
123	if (ret)
124		return ret;
125
126	if (fa->feature_set == FEAT_COMPAT) {
127		set = BTRFS_FEATURE_COMPAT_SAFE_SET;
128		clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
129	} else if (fa->feature_set == FEAT_COMPAT_RO) {
130		set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
131		clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
132	} else {
133		set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
134		clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
135	}
136
137	features = get_features(fs_info, fa->feature_set);
138
139	/* Nothing to do */
140	if ((val && (features & fa->feature_bit)) ||
141	    (!val && !(features & fa->feature_bit)))
142		return count;
143
144	if ((val && !(set & fa->feature_bit)) ||
145	    (!val && !(clear & fa->feature_bit))) {
146		btrfs_info(fs_info,
147			"%sabling feature %s on mounted fs is not supported.",
148			val ? "En" : "Dis", fa->kobj_attr.attr.name);
149		return -EPERM;
150	}
151
152	btrfs_info(fs_info, "%s %s feature flag",
153		   val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
154
155	spin_lock(&fs_info->super_lock);
156	features = get_features(fs_info, fa->feature_set);
157	if (val)
158		features |= fa->feature_bit;
159	else
160		features &= ~fa->feature_bit;
161	set_features(fs_info, fa->feature_set, features);
162	spin_unlock(&fs_info->super_lock);
163
164	/*
165	 * We don't want to do full transaction commit from inside sysfs
166	 */
167	btrfs_set_pending(fs_info, COMMIT);
168	wake_up_process(fs_info->transaction_kthread);
169
170	return count;
171}
172
173static umode_t btrfs_feature_visible(struct kobject *kobj,
174				     struct attribute *attr, int unused)
175{
176	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
177	umode_t mode = attr->mode;
178
179	if (fs_info) {
180		struct btrfs_feature_attr *fa;
181		u64 features;
182
183		fa = attr_to_btrfs_feature_attr(attr);
184		features = get_features(fs_info, fa->feature_set);
185
186		if (can_modify_feature(fa))
187			mode |= S_IWUSR;
188		else if (!(features & fa->feature_bit))
189			mode = 0;
190	}
191
192	return mode;
193}
194
195BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
196BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
197BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
198BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
199BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
200BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
201BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
202BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
203BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
204
205static struct attribute *btrfs_supported_feature_attrs[] = {
206	BTRFS_FEAT_ATTR_PTR(mixed_backref),
207	BTRFS_FEAT_ATTR_PTR(default_subvol),
208	BTRFS_FEAT_ATTR_PTR(mixed_groups),
209	BTRFS_FEAT_ATTR_PTR(compress_lzo),
210	BTRFS_FEAT_ATTR_PTR(big_metadata),
211	BTRFS_FEAT_ATTR_PTR(extended_iref),
212	BTRFS_FEAT_ATTR_PTR(raid56),
213	BTRFS_FEAT_ATTR_PTR(skinny_metadata),
214	BTRFS_FEAT_ATTR_PTR(no_holes),
215	NULL
216};
217
218static const struct attribute_group btrfs_feature_attr_group = {
219	.name = "features",
220	.is_visible = btrfs_feature_visible,
221	.attrs = btrfs_supported_feature_attrs,
222};
223
224static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
225{
226	u64 val;
227	if (lock)
228		spin_lock(lock);
229	val = *value_ptr;
230	if (lock)
231		spin_unlock(lock);
232	return snprintf(buf, PAGE_SIZE, "%llu\n", val);
233}
234
235static ssize_t global_rsv_size_show(struct kobject *kobj,
236				    struct kobj_attribute *ka, char *buf)
237{
238	struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
239	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
240	return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
241}
242BTRFS_ATTR(global_rsv_size, global_rsv_size_show);
243
244static ssize_t global_rsv_reserved_show(struct kobject *kobj,
245					struct kobj_attribute *a, char *buf)
246{
247	struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
248	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
249	return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
250}
251BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show);
252
253#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
254#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
255
256static ssize_t raid_bytes_show(struct kobject *kobj,
257			       struct kobj_attribute *attr, char *buf);
258BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
259BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
260
261static ssize_t raid_bytes_show(struct kobject *kobj,
262			       struct kobj_attribute *attr, char *buf)
263
264{
265	struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
266	struct btrfs_block_group_cache *block_group;
267	int index = to_raid_kobj(kobj)->raid_type;
268	u64 val = 0;
269
270	down_read(&sinfo->groups_sem);
271	list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
272		if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes))
273			val += block_group->key.offset;
274		else
275			val += btrfs_block_group_used(&block_group->item);
276	}
277	up_read(&sinfo->groups_sem);
278	return snprintf(buf, PAGE_SIZE, "%llu\n", val);
279}
280
281static struct attribute *raid_attributes[] = {
282	BTRFS_RAID_ATTR_PTR(total_bytes),
283	BTRFS_RAID_ATTR_PTR(used_bytes),
284	NULL
285};
286
287static void release_raid_kobj(struct kobject *kobj)
288{
289	kfree(to_raid_kobj(kobj));
290}
291
292struct kobj_type btrfs_raid_ktype = {
293	.sysfs_ops = &kobj_sysfs_ops,
294	.release = release_raid_kobj,
295	.default_attrs = raid_attributes,
296};
297
298#define SPACE_INFO_ATTR(field)						\
299static ssize_t btrfs_space_info_show_##field(struct kobject *kobj,	\
300					     struct kobj_attribute *a,	\
301					     char *buf)			\
302{									\
303	struct btrfs_space_info *sinfo = to_space_info(kobj);		\
304	return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf);	\
305}									\
306BTRFS_ATTR(field, btrfs_space_info_show_##field)
307
308static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
309						       struct kobj_attribute *a,
310						       char *buf)
311{
312	struct btrfs_space_info *sinfo = to_space_info(kobj);
313	s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
314	return snprintf(buf, PAGE_SIZE, "%lld\n", val);
315}
316
317SPACE_INFO_ATTR(flags);
318SPACE_INFO_ATTR(total_bytes);
319SPACE_INFO_ATTR(bytes_used);
320SPACE_INFO_ATTR(bytes_pinned);
321SPACE_INFO_ATTR(bytes_reserved);
322SPACE_INFO_ATTR(bytes_may_use);
323SPACE_INFO_ATTR(disk_used);
324SPACE_INFO_ATTR(disk_total);
325BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned);
326
327static struct attribute *space_info_attrs[] = {
328	BTRFS_ATTR_PTR(flags),
329	BTRFS_ATTR_PTR(total_bytes),
330	BTRFS_ATTR_PTR(bytes_used),
331	BTRFS_ATTR_PTR(bytes_pinned),
332	BTRFS_ATTR_PTR(bytes_reserved),
333	BTRFS_ATTR_PTR(bytes_may_use),
334	BTRFS_ATTR_PTR(disk_used),
335	BTRFS_ATTR_PTR(disk_total),
336	BTRFS_ATTR_PTR(total_bytes_pinned),
337	NULL,
338};
339
340static void space_info_release(struct kobject *kobj)
341{
342	struct btrfs_space_info *sinfo = to_space_info(kobj);
343	percpu_counter_destroy(&sinfo->total_bytes_pinned);
344	kfree(sinfo);
345}
346
347struct kobj_type space_info_ktype = {
348	.sysfs_ops = &kobj_sysfs_ops,
349	.release = space_info_release,
350	.default_attrs = space_info_attrs,
351};
352
353static const struct attribute *allocation_attrs[] = {
354	BTRFS_ATTR_PTR(global_rsv_reserved),
355	BTRFS_ATTR_PTR(global_rsv_size),
356	NULL,
357};
358
359static ssize_t btrfs_label_show(struct kobject *kobj,
360				struct kobj_attribute *a, char *buf)
361{
362	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
363	char *label = fs_info->super_copy->label;
364	return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
365}
366
367static ssize_t btrfs_label_store(struct kobject *kobj,
368				 struct kobj_attribute *a,
369				 const char *buf, size_t len)
370{
371	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
372	size_t p_len;
373
374	if (fs_info->sb->s_flags & MS_RDONLY)
375		return -EROFS;
376
377	/*
378	 * p_len is the len until the first occurrence of either
379	 * '\n' or '\0'
380	 */
381	p_len = strcspn(buf, "\n");
382
383	if (p_len >= BTRFS_LABEL_SIZE)
384		return -EINVAL;
385
386	spin_lock(&fs_info->super_lock);
387	memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
388	memcpy(fs_info->super_copy->label, buf, p_len);
389	spin_unlock(&fs_info->super_lock);
390
391	/*
392	 * We don't want to do full transaction commit from inside sysfs
393	 */
394	btrfs_set_pending(fs_info, COMMIT);
395	wake_up_process(fs_info->transaction_kthread);
396
397	return len;
398}
399BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);
400
401static ssize_t btrfs_nodesize_show(struct kobject *kobj,
402				struct kobj_attribute *a, char *buf)
403{
404	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
405
406	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
407}
408
409BTRFS_ATTR(nodesize, btrfs_nodesize_show);
410
411static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
412				struct kobj_attribute *a, char *buf)
413{
414	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
415
416	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
417}
418
419BTRFS_ATTR(sectorsize, btrfs_sectorsize_show);
420
421static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
422				struct kobj_attribute *a, char *buf)
423{
424	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
425
426	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
427}
428
429BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
430
431static struct attribute *btrfs_attrs[] = {
432	BTRFS_ATTR_PTR(label),
433	BTRFS_ATTR_PTR(nodesize),
434	BTRFS_ATTR_PTR(sectorsize),
435	BTRFS_ATTR_PTR(clone_alignment),
436	NULL,
437};
438
439static void btrfs_release_super_kobj(struct kobject *kobj)
440{
441	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
442	complete(&fs_info->kobj_unregister);
443}
444
445static struct kobj_type btrfs_ktype = {
446	.sysfs_ops	= &kobj_sysfs_ops,
447	.release	= btrfs_release_super_kobj,
448	.default_attrs	= btrfs_attrs,
449};
450
451static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
452{
453	if (kobj->ktype != &btrfs_ktype)
454		return NULL;
455	return container_of(kobj, struct btrfs_fs_info, super_kobj);
456}
457
458#define NUM_FEATURE_BITS 64
459static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
460static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
461
462static const u64 supported_feature_masks[3] = {
463	[FEAT_COMPAT]    = BTRFS_FEATURE_COMPAT_SUPP,
464	[FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
465	[FEAT_INCOMPAT]  = BTRFS_FEATURE_INCOMPAT_SUPP,
466};
467
468static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
469{
470	int set;
471
472	for (set = 0; set < FEAT_MAX; set++) {
473		int i;
474		struct attribute *attrs[2];
475		struct attribute_group agroup = {
476			.name = "features",
477			.attrs = attrs,
478		};
479		u64 features = get_features(fs_info, set);
480		features &= ~supported_feature_masks[set];
481
482		if (!features)
483			continue;
484
485		attrs[1] = NULL;
486		for (i = 0; i < NUM_FEATURE_BITS; i++) {
487			struct btrfs_feature_attr *fa;
488
489			if (!(features & (1ULL << i)))
490				continue;
491
492			fa = &btrfs_feature_attrs[set][i];
493			attrs[0] = &fa->kobj_attr.attr;
494			if (add) {
495				int ret;
496				ret = sysfs_merge_group(&fs_info->super_kobj,
497							&agroup);
498				if (ret)
499					return ret;
500			} else
501				sysfs_unmerge_group(&fs_info->super_kobj,
502						    &agroup);
503		}
504
505	}
506	return 0;
507}
508
509static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
510{
511	kobject_del(&fs_info->super_kobj);
512	kobject_put(&fs_info->super_kobj);
513	wait_for_completion(&fs_info->kobj_unregister);
514}
515
516void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
517{
518	if (fs_info->space_info_kobj) {
519		sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
520		kobject_del(fs_info->space_info_kobj);
521		kobject_put(fs_info->space_info_kobj);
522	}
523	kobject_del(fs_info->device_dir_kobj);
524	kobject_put(fs_info->device_dir_kobj);
525	addrm_unknown_feature_attrs(fs_info, false);
526	sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
527	__btrfs_sysfs_remove_one(fs_info);
528}
529
530const char * const btrfs_feature_set_names[3] = {
531	[FEAT_COMPAT]	 = "compat",
532	[FEAT_COMPAT_RO] = "compat_ro",
533	[FEAT_INCOMPAT]	 = "incompat",
534};
535
536char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
537{
538	size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
539	int len = 0;
540	int i;
541	char *str;
542
543	str = kmalloc(bufsize, GFP_KERNEL);
544	if (!str)
545		return str;
546
547	for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
548		const char *name;
549
550		if (!(flags & (1ULL << i)))
551			continue;
552
553		name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
554		len += snprintf(str + len, bufsize - len, "%s%s",
555				len ? "," : "", name);
556	}
557
558	return str;
559}
560
561static void init_feature_attrs(void)
562{
563	struct btrfs_feature_attr *fa;
564	int set, i;
565
566	BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
567		     ARRAY_SIZE(btrfs_feature_attrs));
568	BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
569		     ARRAY_SIZE(btrfs_feature_attrs[0]));
570
571	memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
572	memset(btrfs_unknown_feature_names, 0,
573	       sizeof(btrfs_unknown_feature_names));
574
575	for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
576		struct btrfs_feature_attr *sfa;
577		struct attribute *a = btrfs_supported_feature_attrs[i];
578		int bit;
579		sfa = attr_to_btrfs_feature_attr(a);
580		bit = ilog2(sfa->feature_bit);
581		fa = &btrfs_feature_attrs[sfa->feature_set][bit];
582
583		fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
584	}
585
586	for (set = 0; set < FEAT_MAX; set++) {
587		for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
588			char *name = btrfs_unknown_feature_names[set][i];
589			fa = &btrfs_feature_attrs[set][i];
590
591			if (fa->kobj_attr.attr.name)
592				continue;
593
594			snprintf(name, 13, "%s:%u",
595				 btrfs_feature_set_names[set], i);
596
597			fa->kobj_attr.attr.name = name;
598			fa->kobj_attr.attr.mode = S_IRUGO;
599			fa->feature_set = set;
600			fa->feature_bit = 1ULL << i;
601		}
602	}
603}
604
605int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
606		struct btrfs_device *one_device)
607{
608	struct hd_struct *disk;
609	struct kobject *disk_kobj;
610
611	if (!fs_info->device_dir_kobj)
612		return -EINVAL;
613
614	if (one_device && one_device->bdev) {
615		disk = one_device->bdev->bd_part;
616		disk_kobj = &part_to_dev(disk)->kobj;
617
618		sysfs_remove_link(fs_info->device_dir_kobj,
619						disk_kobj->name);
620	}
621
622	return 0;
623}
624
625int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
626		struct btrfs_device *one_device)
627{
628	int error = 0;
629	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
630	struct btrfs_device *dev;
631
632	if (!fs_info->device_dir_kobj)
633		fs_info->device_dir_kobj = kobject_create_and_add("devices",
634						&fs_info->super_kobj);
635
636	if (!fs_info->device_dir_kobj)
637		return -ENOMEM;
638
639	list_for_each_entry(dev, &fs_devices->devices, dev_list) {
640		struct hd_struct *disk;
641		struct kobject *disk_kobj;
642
643		if (!dev->bdev)
644			continue;
645
646		if (one_device && one_device != dev)
647			continue;
648
649		disk = dev->bdev->bd_part;
650		disk_kobj = &part_to_dev(disk)->kobj;
651
652		error = sysfs_create_link(fs_info->device_dir_kobj,
653					  disk_kobj, disk_kobj->name);
654		if (error)
655			break;
656	}
657
658	return error;
659}
660
661/* /sys/fs/btrfs/ entry */
662static struct kset *btrfs_kset;
663
664/* /sys/kernel/debug/btrfs */
665static struct dentry *btrfs_debugfs_root_dentry;
666
667/* Debugging tunables and exported data */
668u64 btrfs_debugfs_test;
669
670int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
671{
672	int error;
673
674	init_completion(&fs_info->kobj_unregister);
675	fs_info->super_kobj.kset = btrfs_kset;
676	error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
677				     "%pU", fs_info->fsid);
678	if (error)
679		return error;
680
681	error = sysfs_create_group(&fs_info->super_kobj,
682				   &btrfs_feature_attr_group);
683	if (error) {
684		__btrfs_sysfs_remove_one(fs_info);
685		return error;
686	}
687
688	error = addrm_unknown_feature_attrs(fs_info, true);
689	if (error)
690		goto failure;
691
692	error = btrfs_kobj_add_device(fs_info, NULL);
693	if (error)
694		goto failure;
695
696	fs_info->space_info_kobj = kobject_create_and_add("allocation",
697						  &fs_info->super_kobj);
698	if (!fs_info->space_info_kobj) {
699		error = -ENOMEM;
700		goto failure;
701	}
702
703	error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
704	if (error)
705		goto failure;
706
707	return 0;
708failure:
709	btrfs_sysfs_remove_one(fs_info);
710	return error;
711}
712
713static int btrfs_init_debugfs(void)
714{
715#ifdef CONFIG_DEBUG_FS
716	btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
717	if (!btrfs_debugfs_root_dentry)
718		return -ENOMEM;
719
720	debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
721			&btrfs_debugfs_test);
722#endif
723	return 0;
724}
725
726int btrfs_init_sysfs(void)
727{
728	int ret;
729
730	btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
731	if (!btrfs_kset)
732		return -ENOMEM;
733
734	ret = btrfs_init_debugfs();
735	if (ret)
736		goto out1;
737
738	init_feature_attrs();
739	ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
740	if (ret)
741		goto out2;
742
743	return 0;
744out2:
745	debugfs_remove_recursive(btrfs_debugfs_root_dentry);
746out1:
747	kset_unregister(btrfs_kset);
748
749	return ret;
750}
751
752void btrfs_exit_sysfs(void)
753{
754	sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
755	kset_unregister(btrfs_kset);
756	debugfs_remove_recursive(btrfs_debugfs_root_dentry);
757}
758
759