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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/module.h>
25#include <linux/kobject.h>
26
27#include "ctree.h"
28#include "disk-io.h"
29#include "transaction.h"
30
31/* /sys/fs/btrfs/ entry */
32static struct kset *btrfs_kset;
33
34int btrfs_init_sysfs(void)
35{
36 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
37 if (!btrfs_kset)
38 return -ENOMEM;
39 return 0;
40}
41
42void btrfs_exit_sysfs(void)
43{
44 kset_unregister(btrfs_kset);
45}
46
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 struct btrfs_trans_handle *trans;
115 u64 features, set, clear;
116 unsigned long val;
117 int ret;
118
119 fs_info = to_fs_info(kobj);
120 if (!fs_info)
121 return -EPERM;
122
123 ret = kstrtoul(skip_spaces(buf), 0, &val);
124 if (ret)
125 return ret;
126
127 if (fa->feature_set == FEAT_COMPAT) {
128 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
129 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
130 } else if (fa->feature_set == FEAT_COMPAT_RO) {
131 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
132 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
133 } else {
134 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
135 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
136 }
137
138 features = get_features(fs_info, fa->feature_set);
139
140 /* Nothing to do */
141 if ((val && (features & fa->feature_bit)) ||
142 (!val && !(features & fa->feature_bit)))
143 return count;
144
145 if ((val && !(set & fa->feature_bit)) ||
146 (!val && !(clear & fa->feature_bit))) {
147 btrfs_info(fs_info,
148 "%sabling feature %s on mounted fs is not supported.",
149 val ? "En" : "Dis", fa->kobj_attr.attr.name);
150 return -EPERM;
151 }
152
153 btrfs_info(fs_info, "%s %s feature flag",
154 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
155
156 trans = btrfs_start_transaction(fs_info->fs_root, 0);
157 if (IS_ERR(trans))
158 return PTR_ERR(trans);
159
160 spin_lock(&fs_info->super_lock);
161 features = get_features(fs_info, fa->feature_set);
162 if (val)
163 features |= fa->feature_bit;
164 else
165 features &= ~fa->feature_bit;
166 set_features(fs_info, fa->feature_set, features);
167 spin_unlock(&fs_info->super_lock);
168
169 ret = btrfs_commit_transaction(trans, fs_info->fs_root);
170 if (ret)
171 return ret;
172
173 return count;
174}
175
176static umode_t btrfs_feature_visible(struct kobject *kobj,
177 struct attribute *attr, int unused)
178{
179 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
180 umode_t mode = attr->mode;
181
182 if (fs_info) {
183 struct btrfs_feature_attr *fa;
184 u64 features;
185
186 fa = attr_to_btrfs_feature_attr(attr);
187 features = get_features(fs_info, fa->feature_set);
188
189 if (can_modify_feature(fa))
190 mode |= S_IWUSR;
191 else if (!(features & fa->feature_bit))
192 mode = 0;
193 }
194
195 return mode;
196}
197
198BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
199BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
200BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
201BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
202BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
203BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
204BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
205BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
206BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
207
208static struct attribute *btrfs_supported_feature_attrs[] = {
209 BTRFS_FEAT_ATTR_PTR(mixed_backref),
210 BTRFS_FEAT_ATTR_PTR(default_subvol),
211 BTRFS_FEAT_ATTR_PTR(mixed_groups),
212 BTRFS_FEAT_ATTR_PTR(compress_lzo),
213 BTRFS_FEAT_ATTR_PTR(big_metadata),
214 BTRFS_FEAT_ATTR_PTR(extended_iref),
215 BTRFS_FEAT_ATTR_PTR(raid56),
216 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
217 BTRFS_FEAT_ATTR_PTR(no_holes),
218 NULL
219};
220
221static const struct attribute_group btrfs_feature_attr_group = {
222 .name = "features",
223 .is_visible = btrfs_feature_visible,
224 .attrs = btrfs_supported_feature_attrs,
225};
226
227static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
228{
229 u64 val;
230 if (lock)
231 spin_lock(lock);
232 val = *value_ptr;
233 if (lock)
234 spin_unlock(lock);
235 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
236}
237
238static ssize_t global_rsv_size_show(struct kobject *kobj,
239 struct kobj_attribute *ka, char *buf)
240{
241 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
242 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
243 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
244}
245BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show);
246
247static ssize_t global_rsv_reserved_show(struct kobject *kobj,
248 struct kobj_attribute *a, char *buf)
249{
250 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
251 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
252 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
253}
254BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show);
255
256#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
257
258static ssize_t raid_bytes_show(struct kobject *kobj,
259 struct kobj_attribute *attr, char *buf);
260BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
261BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
262
263static ssize_t raid_bytes_show(struct kobject *kobj,
264 struct kobj_attribute *attr, char *buf)
265
266{
267 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
268 struct btrfs_block_group_cache *block_group;
269 int index = kobj - sinfo->block_group_kobjs;
270 u64 val = 0;
271
272 down_read(&sinfo->groups_sem);
273 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
274 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes))
275 val += block_group->key.offset;
276 else
277 val += btrfs_block_group_used(&block_group->item);
278 }
279 up_read(&sinfo->groups_sem);
280 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
281}
282
283static struct attribute *raid_attributes[] = {
284 BTRFS_RAID_ATTR_PTR(total_bytes),
285 BTRFS_RAID_ATTR_PTR(used_bytes),
286 NULL
287};
288
289static void release_raid_kobj(struct kobject *kobj)
290{
291 kobject_put(kobj->parent);
292}
293
294struct kobj_type btrfs_raid_ktype = {
295 .sysfs_ops = &kobj_sysfs_ops,
296 .release = release_raid_kobj,
297 .default_attrs = raid_attributes,
298};
299
300#define SPACE_INFO_ATTR(field) \
301static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
302 struct kobj_attribute *a, \
303 char *buf) \
304{ \
305 struct btrfs_space_info *sinfo = to_space_info(kobj); \
306 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
307} \
308BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field)
309
310static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
311 struct kobj_attribute *a,
312 char *buf)
313{
314 struct btrfs_space_info *sinfo = to_space_info(kobj);
315 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
316 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
317}
318
319SPACE_INFO_ATTR(flags);
320SPACE_INFO_ATTR(total_bytes);
321SPACE_INFO_ATTR(bytes_used);
322SPACE_INFO_ATTR(bytes_pinned);
323SPACE_INFO_ATTR(bytes_reserved);
324SPACE_INFO_ATTR(bytes_may_use);
325SPACE_INFO_ATTR(disk_used);
326SPACE_INFO_ATTR(disk_total);
327BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned);
328
329static struct attribute *space_info_attrs[] = {
330 BTRFS_ATTR_PTR(flags),
331 BTRFS_ATTR_PTR(total_bytes),
332 BTRFS_ATTR_PTR(bytes_used),
333 BTRFS_ATTR_PTR(bytes_pinned),
334 BTRFS_ATTR_PTR(bytes_reserved),
335 BTRFS_ATTR_PTR(bytes_may_use),
336 BTRFS_ATTR_PTR(disk_used),
337 BTRFS_ATTR_PTR(disk_total),
338 BTRFS_ATTR_PTR(total_bytes_pinned),
339 NULL,
340};
341
342static void space_info_release(struct kobject *kobj)
343{
344 struct btrfs_space_info *sinfo = to_space_info(kobj);
345 percpu_counter_destroy(&sinfo->total_bytes_pinned);
346 kfree(sinfo);
347}
348
349struct kobj_type space_info_ktype = {
350 .sysfs_ops = &kobj_sysfs_ops,
351 .release = space_info_release,
352 .default_attrs = space_info_attrs,
353};
354
355static const struct attribute *allocation_attrs[] = {
356 BTRFS_ATTR_PTR(global_rsv_reserved),
357 BTRFS_ATTR_PTR(global_rsv_size),
358 NULL,
359};
360
361static ssize_t btrfs_label_show(struct kobject *kobj,
362 struct kobj_attribute *a, char *buf)
363{
364 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
365 return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label);
366}
367
368static ssize_t btrfs_label_store(struct kobject *kobj,
369 struct kobj_attribute *a,
370 const char *buf, size_t len)
371{
372 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
373 struct btrfs_trans_handle *trans;
374 struct btrfs_root *root = fs_info->fs_root;
375 int ret;
376
377 if (len >= BTRFS_LABEL_SIZE) {
378 pr_err("BTRFS: unable to set label with more than %d bytes\n",
379 BTRFS_LABEL_SIZE - 1);
380 return -EINVAL;
381 }
382
383 trans = btrfs_start_transaction(root, 0);
384 if (IS_ERR(trans))
385 return PTR_ERR(trans);
386
387 spin_lock(&root->fs_info->super_lock);
388 strcpy(fs_info->super_copy->label, buf);
389 spin_unlock(&root->fs_info->super_lock);
390 ret = btrfs_commit_transaction(trans, root);
391
392 if (!ret)
393 return len;
394
395 return ret;
396}
397BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);
398
399static struct attribute *btrfs_attrs[] = {
400 BTRFS_ATTR_PTR(label),
401 NULL,
402};
403
404static void btrfs_release_super_kobj(struct kobject *kobj)
405{
406 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
407 complete(&fs_info->kobj_unregister);
408}
409
410static struct kobj_type btrfs_ktype = {
411 .sysfs_ops = &kobj_sysfs_ops,
412 .release = btrfs_release_super_kobj,
413 .default_attrs = btrfs_attrs,
414};
415
416static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
417{
418 if (kobj->ktype != &btrfs_ktype)
419 return NULL;
420 return container_of(kobj, struct btrfs_fs_info, super_kobj);
421}
422
423#define NUM_FEATURE_BITS 64
424static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
425static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
426
427static u64 supported_feature_masks[3] = {
428 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
429 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
430 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
431};
432
433static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
434{
435 int set;
436
437 for (set = 0; set < FEAT_MAX; set++) {
438 int i;
439 struct attribute *attrs[2];
440 struct attribute_group agroup = {
441 .name = "features",
442 .attrs = attrs,
443 };
444 u64 features = get_features(fs_info, set);
445 features &= ~supported_feature_masks[set];
446
447 if (!features)
448 continue;
449
450 attrs[1] = NULL;
451 for (i = 0; i < NUM_FEATURE_BITS; i++) {
452 struct btrfs_feature_attr *fa;
453
454 if (!(features & (1ULL << i)))
455 continue;
456
457 fa = &btrfs_feature_attrs[set][i];
458 attrs[0] = &fa->kobj_attr.attr;
459 if (add) {
460 int ret;
461 ret = sysfs_merge_group(&fs_info->super_kobj,
462 &agroup);
463 if (ret)
464 return ret;
465 } else
466 sysfs_unmerge_group(&fs_info->super_kobj,
467 &agroup);
468 }
469
470 }
471 return 0;
472}
473
474static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
475{
476 kobject_del(&fs_info->super_kobj);
477 kobject_put(&fs_info->super_kobj);
478 wait_for_completion(&fs_info->kobj_unregister);
479}
480
481void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
482{
483 if (fs_info->space_info_kobj) {
484 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
485 kobject_del(fs_info->space_info_kobj);
486 kobject_put(fs_info->space_info_kobj);
487 }
488 kobject_del(fs_info->device_dir_kobj);
489 kobject_put(fs_info->device_dir_kobj);
490 addrm_unknown_feature_attrs(fs_info, false);
491 sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
492 __btrfs_sysfs_remove_one(fs_info);
493}
494
495const char * const btrfs_feature_set_names[3] = {
496 [FEAT_COMPAT] = "compat",
497 [FEAT_COMPAT_RO] = "compat_ro",
498 [FEAT_INCOMPAT] = "incompat",
499};
500
501char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
502{
503 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
504 int len = 0;
505 int i;
506 char *str;
507
508 str = kmalloc(bufsize, GFP_KERNEL);
509 if (!str)
510 return str;
511
512 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
513 const char *name;
514
515 if (!(flags & (1ULL << i)))
516 continue;
517
518 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
519 len += snprintf(str + len, bufsize - len, "%s%s",
520 len ? "," : "", name);
521 }
522
523 return str;
524}
525
526static void init_feature_attrs(void)
527{
528 struct btrfs_feature_attr *fa;
529 int set, i;
530
531 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
532 ARRAY_SIZE(btrfs_feature_attrs));
533 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
534 ARRAY_SIZE(btrfs_feature_attrs[0]));
535
536 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
537 memset(btrfs_unknown_feature_names, 0,
538 sizeof(btrfs_unknown_feature_names));
539
540 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
541 struct btrfs_feature_attr *sfa;
542 struct attribute *a = btrfs_supported_feature_attrs[i];
543 int bit;
544 sfa = attr_to_btrfs_feature_attr(a);
545 bit = ilog2(sfa->feature_bit);
546 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
547
548 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
549 }
550
551 for (set = 0; set < FEAT_MAX; set++) {
552 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
553 char *name = btrfs_unknown_feature_names[set][i];
554 fa = &btrfs_feature_attrs[set][i];
555
556 if (fa->kobj_attr.attr.name)
557 continue;
558
559 snprintf(name, 13, "%s:%u",
560 btrfs_feature_set_names[set], i);
561
562 fa->kobj_attr.attr.name = name;
563 fa->kobj_attr.attr.mode = S_IRUGO;
564 fa->feature_set = set;
565 fa->feature_bit = 1ULL << i;
566 }
567 }
568}
569
570static int add_device_membership(struct btrfs_fs_info *fs_info)
571{
572 int error = 0;
573 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
574 struct btrfs_device *dev;
575
576 fs_info->device_dir_kobj = kobject_create_and_add("devices",
577 &fs_info->super_kobj);
578 if (!fs_info->device_dir_kobj)
579 return -ENOMEM;
580
581 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
582 struct hd_struct *disk;
583 struct kobject *disk_kobj;
584
585 if (!dev->bdev)
586 continue;
587
588 disk = dev->bdev->bd_part;
589 disk_kobj = &part_to_dev(disk)->kobj;
590
591 error = sysfs_create_link(fs_info->device_dir_kobj,
592 disk_kobj, disk_kobj->name);
593 if (error)
594 break;
595 }
596
597 return error;
598}
599
600/* /sys/fs/btrfs/ entry */
601static struct kset *btrfs_kset;
602
603/* /sys/kernel/debug/btrfs */
604static struct dentry *btrfs_debugfs_root_dentry;
605
606/* Debugging tunables and exported data */
607u64 btrfs_debugfs_test;
608
609int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
610{
611 int error;
612
613 init_completion(&fs_info->kobj_unregister);
614 fs_info->super_kobj.kset = btrfs_kset;
615 error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
616 "%pU", fs_info->fsid);
617 if (error)
618 return error;
619
620 error = sysfs_create_group(&fs_info->super_kobj,
621 &btrfs_feature_attr_group);
622 if (error) {
623 __btrfs_sysfs_remove_one(fs_info);
624 return error;
625 }
626
627 error = addrm_unknown_feature_attrs(fs_info, true);
628 if (error)
629 goto failure;
630
631 error = add_device_membership(fs_info);
632 if (error)
633 goto failure;
634
635 fs_info->space_info_kobj = kobject_create_and_add("allocation",
636 &fs_info->super_kobj);
637 if (!fs_info->space_info_kobj) {
638 error = -ENOMEM;
639 goto failure;
640 }
641
642 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
643 if (error)
644 goto failure;
645
646 return 0;
647failure:
648 btrfs_sysfs_remove_one(fs_info);
649 return error;
650}
651
652static int btrfs_init_debugfs(void)
653{
654#ifdef CONFIG_DEBUG_FS
655 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
656 if (!btrfs_debugfs_root_dentry)
657 return -ENOMEM;
658
659 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
660 &btrfs_debugfs_test);
661#endif
662 return 0;
663}
664
665int btrfs_init_sysfs(void)
666{
667 int ret;
668
669 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
670 if (!btrfs_kset)
671 return -ENOMEM;
672
673 ret = btrfs_init_debugfs();
674 if (ret)
675 return ret;
676
677 init_feature_attrs();
678 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
679
680 return ret;
681}
682
683void btrfs_exit_sysfs(void)
684{
685 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
686 kset_unregister(btrfs_kset);
687 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
688}
689