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-rw-r--r--fs/btrfs/sysfs.c623
1 files changed, 623 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 5b326cd60a4a..865f4cf9a769 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -22,24 +22,647 @@
22#include <linux/completion.h> 22#include <linux/completion.h>
23#include <linux/buffer_head.h> 23#include <linux/buffer_head.h>
24#include <linux/kobject.h> 24#include <linux/kobject.h>
25#include <linux/bug.h>
26#include <linux/genhd.h>
25 27
26#include "ctree.h" 28#include "ctree.h"
27#include "disk-io.h" 29#include "disk-io.h"
28#include "transaction.h" 30#include "transaction.h"
31#include "sysfs.h"
32#include "volumes.h"
33
34static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
35
36static u64 get_features(struct btrfs_fs_info *fs_info,
37 enum btrfs_feature_set set)
38{
39 struct btrfs_super_block *disk_super = fs_info->super_copy;
40 if (set == FEAT_COMPAT)
41 return btrfs_super_compat_flags(disk_super);
42 else if (set == FEAT_COMPAT_RO)
43 return btrfs_super_compat_ro_flags(disk_super);
44 else
45 return btrfs_super_incompat_flags(disk_super);
46}
47
48static void set_features(struct btrfs_fs_info *fs_info,
49 enum btrfs_feature_set set, u64 features)
50{
51 struct btrfs_super_block *disk_super = fs_info->super_copy;
52 if (set == FEAT_COMPAT)
53 btrfs_set_super_compat_flags(disk_super, features);
54 else if (set == FEAT_COMPAT_RO)
55 btrfs_set_super_compat_ro_flags(disk_super, features);
56 else
57 btrfs_set_super_incompat_flags(disk_super, features);
58}
59
60static int can_modify_feature(struct btrfs_feature_attr *fa)
61{
62 int val = 0;
63 u64 set, clear;
64 switch (fa->feature_set) {
65 case FEAT_COMPAT:
66 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
67 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
68 break;
69 case FEAT_COMPAT_RO:
70 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
71 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
72 break;
73 case FEAT_INCOMPAT:
74 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
75 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
76 break;
77 default:
78 printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n",
79 fa->feature_set);
80 return 0;
81 }
82
83 if (set & fa->feature_bit)
84 val |= 1;
85 if (clear & fa->feature_bit)
86 val |= 2;
87
88 return val;
89}
90
91static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
92 struct kobj_attribute *a, char *buf)
93{
94 int val = 0;
95 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
96 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
97 if (fs_info) {
98 u64 features = get_features(fs_info, fa->feature_set);
99 if (features & fa->feature_bit)
100 val = 1;
101 } else
102 val = can_modify_feature(fa);
103
104 return snprintf(buf, PAGE_SIZE, "%d\n", val);
105}
106
107static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
108 struct kobj_attribute *a,
109 const char *buf, size_t count)
110{
111 struct btrfs_fs_info *fs_info;
112 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
113 struct btrfs_trans_handle *trans;
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 trans = btrfs_start_transaction(fs_info->fs_root, 0);
156 if (IS_ERR(trans))
157 return PTR_ERR(trans);
158
159 spin_lock(&fs_info->super_lock);
160 features = get_features(fs_info, fa->feature_set);
161 if (val)
162 features |= fa->feature_bit;
163 else
164 features &= ~fa->feature_bit;
165 set_features(fs_info, fa->feature_set, features);
166 spin_unlock(&fs_info->super_lock);
167
168 ret = btrfs_commit_transaction(trans, fs_info->fs_root);
169 if (ret)
170 return ret;
171
172 return count;
173}
174
175static umode_t btrfs_feature_visible(struct kobject *kobj,
176 struct attribute *attr, int unused)
177{
178 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
179 umode_t mode = attr->mode;
180
181 if (fs_info) {
182 struct btrfs_feature_attr *fa;
183 u64 features;
184
185 fa = attr_to_btrfs_feature_attr(attr);
186 features = get_features(fs_info, fa->feature_set);
187
188 if (can_modify_feature(fa))
189 mode |= S_IWUSR;
190 else if (!(features & fa->feature_bit))
191 mode = 0;
192 }
193
194 return mode;
195}
196
197BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
198BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
199BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
200BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
201BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
202BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
203BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
204BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
205BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
206
207static struct attribute *btrfs_supported_feature_attrs[] = {
208 BTRFS_FEAT_ATTR_PTR(mixed_backref),
209 BTRFS_FEAT_ATTR_PTR(default_subvol),
210 BTRFS_FEAT_ATTR_PTR(mixed_groups),
211 BTRFS_FEAT_ATTR_PTR(compress_lzo),
212 BTRFS_FEAT_ATTR_PTR(big_metadata),
213 BTRFS_FEAT_ATTR_PTR(extended_iref),
214 BTRFS_FEAT_ATTR_PTR(raid56),
215 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
216 BTRFS_FEAT_ATTR_PTR(no_holes),
217 NULL
218};
219
220static const struct attribute_group btrfs_feature_attr_group = {
221 .name = "features",
222 .is_visible = btrfs_feature_visible,
223 .attrs = btrfs_supported_feature_attrs,
224};
225
226static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
227{
228 u64 val;
229 if (lock)
230 spin_lock(lock);
231 val = *value_ptr;
232 if (lock)
233 spin_unlock(lock);
234 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
235}
236
237static ssize_t global_rsv_size_show(struct kobject *kobj,
238 struct kobj_attribute *ka, char *buf)
239{
240 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
241 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
242 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
243}
244BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show);
245
246static ssize_t global_rsv_reserved_show(struct kobject *kobj,
247 struct kobj_attribute *a, char *buf)
248{
249 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
250 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
251 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
252}
253BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show);
254
255#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
256
257static ssize_t raid_bytes_show(struct kobject *kobj,
258 struct kobj_attribute *attr, char *buf);
259BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
260BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
261
262static ssize_t raid_bytes_show(struct kobject *kobj,
263 struct kobj_attribute *attr, char *buf)
264
265{
266 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
267 struct btrfs_block_group_cache *block_group;
268 int index = kobj - sinfo->block_group_kobjs;
269 u64 val = 0;
270
271 down_read(&sinfo->groups_sem);
272 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
273 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes))
274 val += block_group->key.offset;
275 else
276 val += btrfs_block_group_used(&block_group->item);
277 }
278 up_read(&sinfo->groups_sem);
279 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
280}
281
282static struct attribute *raid_attributes[] = {
283 BTRFS_RAID_ATTR_PTR(total_bytes),
284 BTRFS_RAID_ATTR_PTR(used_bytes),
285 NULL
286};
287
288static void release_raid_kobj(struct kobject *kobj)
289{
290 kobject_put(kobj->parent);
291}
292
293struct kobj_type btrfs_raid_ktype = {
294 .sysfs_ops = &kobj_sysfs_ops,
295 .release = release_raid_kobj,
296 .default_attrs = raid_attributes,
297};
298
299#define SPACE_INFO_ATTR(field) \
300static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
301 struct kobj_attribute *a, \
302 char *buf) \
303{ \
304 struct btrfs_space_info *sinfo = to_space_info(kobj); \
305 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
306} \
307BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field)
308
309static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
310 struct kobj_attribute *a,
311 char *buf)
312{
313 struct btrfs_space_info *sinfo = to_space_info(kobj);
314 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
315 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
316}
317
318SPACE_INFO_ATTR(flags);
319SPACE_INFO_ATTR(total_bytes);
320SPACE_INFO_ATTR(bytes_used);
321SPACE_INFO_ATTR(bytes_pinned);
322SPACE_INFO_ATTR(bytes_reserved);
323SPACE_INFO_ATTR(bytes_may_use);
324SPACE_INFO_ATTR(disk_used);
325SPACE_INFO_ATTR(disk_total);
326BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned);
327
328static struct attribute *space_info_attrs[] = {
329 BTRFS_ATTR_PTR(flags),
330 BTRFS_ATTR_PTR(total_bytes),
331 BTRFS_ATTR_PTR(bytes_used),
332 BTRFS_ATTR_PTR(bytes_pinned),
333 BTRFS_ATTR_PTR(bytes_reserved),
334 BTRFS_ATTR_PTR(bytes_may_use),
335 BTRFS_ATTR_PTR(disk_used),
336 BTRFS_ATTR_PTR(disk_total),
337 BTRFS_ATTR_PTR(total_bytes_pinned),
338 NULL,
339};
340
341static void space_info_release(struct kobject *kobj)
342{
343 struct btrfs_space_info *sinfo = to_space_info(kobj);
344 percpu_counter_destroy(&sinfo->total_bytes_pinned);
345 kfree(sinfo);
346}
347
348struct kobj_type space_info_ktype = {
349 .sysfs_ops = &kobj_sysfs_ops,
350 .release = space_info_release,
351 .default_attrs = space_info_attrs,
352};
353
354static const struct attribute *allocation_attrs[] = {
355 BTRFS_ATTR_PTR(global_rsv_reserved),
356 BTRFS_ATTR_PTR(global_rsv_size),
357 NULL,
358};
359
360static ssize_t btrfs_label_show(struct kobject *kobj,
361 struct kobj_attribute *a, char *buf)
362{
363 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
364 return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->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 struct btrfs_trans_handle *trans;
373 struct btrfs_root *root = fs_info->fs_root;
374 int ret;
375
376 if (len >= BTRFS_LABEL_SIZE) {
377 pr_err("BTRFS: unable to set label with more than %d bytes\n",
378 BTRFS_LABEL_SIZE - 1);
379 return -EINVAL;
380 }
381
382 trans = btrfs_start_transaction(root, 0);
383 if (IS_ERR(trans))
384 return PTR_ERR(trans);
385
386 spin_lock(&root->fs_info->super_lock);
387 strcpy(fs_info->super_copy->label, buf);
388 spin_unlock(&root->fs_info->super_lock);
389 ret = btrfs_commit_transaction(trans, root);
390
391 if (!ret)
392 return len;
393
394 return ret;
395}
396BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);
397
398static struct attribute *btrfs_attrs[] = {
399 BTRFS_ATTR_PTR(label),
400 NULL,
401};
402
403static void btrfs_release_super_kobj(struct kobject *kobj)
404{
405 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
406 complete(&fs_info->kobj_unregister);
407}
408
409static struct kobj_type btrfs_ktype = {
410 .sysfs_ops = &kobj_sysfs_ops,
411 .release = btrfs_release_super_kobj,
412 .default_attrs = btrfs_attrs,
413};
414
415static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
416{
417 if (kobj->ktype != &btrfs_ktype)
418 return NULL;
419 return container_of(kobj, struct btrfs_fs_info, super_kobj);
420}
421
422#define NUM_FEATURE_BITS 64
423static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
424static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
425
426static u64 supported_feature_masks[3] = {
427 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
428 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
429 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
430};
431
432static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
433{
434 int set;
435
436 for (set = 0; set < FEAT_MAX; set++) {
437 int i;
438 struct attribute *attrs[2];
439 struct attribute_group agroup = {
440 .name = "features",
441 .attrs = attrs,
442 };
443 u64 features = get_features(fs_info, set);
444 features &= ~supported_feature_masks[set];
445
446 if (!features)
447 continue;
448
449 attrs[1] = NULL;
450 for (i = 0; i < NUM_FEATURE_BITS; i++) {
451 struct btrfs_feature_attr *fa;
452
453 if (!(features & (1ULL << i)))
454 continue;
455
456 fa = &btrfs_feature_attrs[set][i];
457 attrs[0] = &fa->kobj_attr.attr;
458 if (add) {
459 int ret;
460 ret = sysfs_merge_group(&fs_info->super_kobj,
461 &agroup);
462 if (ret)
463 return ret;
464 } else
465 sysfs_unmerge_group(&fs_info->super_kobj,
466 &agroup);
467 }
468
469 }
470 return 0;
471}
472
473static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
474{
475 kobject_del(&fs_info->super_kobj);
476 kobject_put(&fs_info->super_kobj);
477 wait_for_completion(&fs_info->kobj_unregister);
478}
479
480void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
481{
482 if (fs_info->space_info_kobj) {
483 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
484 kobject_del(fs_info->space_info_kobj);
485 kobject_put(fs_info->space_info_kobj);
486 }
487 kobject_del(fs_info->device_dir_kobj);
488 kobject_put(fs_info->device_dir_kobj);
489 addrm_unknown_feature_attrs(fs_info, false);
490 sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
491 __btrfs_sysfs_remove_one(fs_info);
492}
493
494const char * const btrfs_feature_set_names[3] = {
495 [FEAT_COMPAT] = "compat",
496 [FEAT_COMPAT_RO] = "compat_ro",
497 [FEAT_INCOMPAT] = "incompat",
498};
499
500char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
501{
502 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
503 int len = 0;
504 int i;
505 char *str;
506
507 str = kmalloc(bufsize, GFP_KERNEL);
508 if (!str)
509 return str;
510
511 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
512 const char *name;
513
514 if (!(flags & (1ULL << i)))
515 continue;
516
517 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
518 len += snprintf(str + len, bufsize - len, "%s%s",
519 len ? "," : "", name);
520 }
521
522 return str;
523}
524
525static void init_feature_attrs(void)
526{
527 struct btrfs_feature_attr *fa;
528 int set, i;
529
530 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
531 ARRAY_SIZE(btrfs_feature_attrs));
532 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
533 ARRAY_SIZE(btrfs_feature_attrs[0]));
534
535 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
536 memset(btrfs_unknown_feature_names, 0,
537 sizeof(btrfs_unknown_feature_names));
538
539 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
540 struct btrfs_feature_attr *sfa;
541 struct attribute *a = btrfs_supported_feature_attrs[i];
542 int bit;
543 sfa = attr_to_btrfs_feature_attr(a);
544 bit = ilog2(sfa->feature_bit);
545 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
546
547 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
548 }
549
550 for (set = 0; set < FEAT_MAX; set++) {
551 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
552 char *name = btrfs_unknown_feature_names[set][i];
553 fa = &btrfs_feature_attrs[set][i];
554
555 if (fa->kobj_attr.attr.name)
556 continue;
557
558 snprintf(name, 13, "%s:%u",
559 btrfs_feature_set_names[set], i);
560
561 fa->kobj_attr.attr.name = name;
562 fa->kobj_attr.attr.mode = S_IRUGO;
563 fa->feature_set = set;
564 fa->feature_bit = 1ULL << i;
565 }
566 }
567}
568
569static int add_device_membership(struct btrfs_fs_info *fs_info)
570{
571 int error = 0;
572 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
573 struct btrfs_device *dev;
574
575 fs_info->device_dir_kobj = kobject_create_and_add("devices",
576 &fs_info->super_kobj);
577 if (!fs_info->device_dir_kobj)
578 return -ENOMEM;
579
580 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
581 struct hd_struct *disk;
582 struct kobject *disk_kobj;
583
584 if (!dev->bdev)
585 continue;
586
587 disk = dev->bdev->bd_part;
588 disk_kobj = &part_to_dev(disk)->kobj;
589
590 error = sysfs_create_link(fs_info->device_dir_kobj,
591 disk_kobj, disk_kobj->name);
592 if (error)
593 break;
594 }
595
596 return error;
597}
29 598
30/* /sys/fs/btrfs/ entry */ 599/* /sys/fs/btrfs/ entry */
31static struct kset *btrfs_kset; 600static struct kset *btrfs_kset;
32 601
602int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
603{
604 int error;
605
606 init_completion(&fs_info->kobj_unregister);
607 fs_info->super_kobj.kset = btrfs_kset;
608 error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
609 "%pU", fs_info->fsid);
610 if (error)
611 return error;
612
613 error = sysfs_create_group(&fs_info->super_kobj,
614 &btrfs_feature_attr_group);
615 if (error) {
616 __btrfs_sysfs_remove_one(fs_info);
617 return error;
618 }
619
620 error = addrm_unknown_feature_attrs(fs_info, true);
621 if (error)
622 goto failure;
623
624 error = add_device_membership(fs_info);
625 if (error)
626 goto failure;
627
628 fs_info->space_info_kobj = kobject_create_and_add("allocation",
629 &fs_info->super_kobj);
630 if (!fs_info->space_info_kobj) {
631 error = -ENOMEM;
632 goto failure;
633 }
634
635 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
636 if (error)
637 goto failure;
638
639 return 0;
640failure:
641 btrfs_sysfs_remove_one(fs_info);
642 return error;
643}
644
33int btrfs_init_sysfs(void) 645int btrfs_init_sysfs(void)
34{ 646{
647 int ret;
35 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 648 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
36 if (!btrfs_kset) 649 if (!btrfs_kset)
37 return -ENOMEM; 650 return -ENOMEM;
651
652 init_feature_attrs();
653
654 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
655 if (ret) {
656 kset_unregister(btrfs_kset);
657 return ret;
658 }
659
38 return 0; 660 return 0;
39} 661}
40 662
41void btrfs_exit_sysfs(void) 663void btrfs_exit_sysfs(void)
42{ 664{
665 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
43 kset_unregister(btrfs_kset); 666 kset_unregister(btrfs_kset);
44} 667}
45 668
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-04 13:29:27 -0400