2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
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>
31 #include "transaction.h"
35 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
36 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
38 static u64 get_features(struct btrfs_fs_info *fs_info,
39 enum btrfs_feature_set set)
41 struct btrfs_super_block *disk_super = fs_info->super_copy;
42 if (set == FEAT_COMPAT)
43 return btrfs_super_compat_flags(disk_super);
44 else if (set == FEAT_COMPAT_RO)
45 return btrfs_super_compat_ro_flags(disk_super);
47 return btrfs_super_incompat_flags(disk_super);
50 static void set_features(struct btrfs_fs_info *fs_info,
51 enum btrfs_feature_set set, u64 features)
53 struct btrfs_super_block *disk_super = fs_info->super_copy;
54 if (set == FEAT_COMPAT)
55 btrfs_set_super_compat_flags(disk_super, features);
56 else if (set == FEAT_COMPAT_RO)
57 btrfs_set_super_compat_ro_flags(disk_super, features);
59 btrfs_set_super_incompat_flags(disk_super, features);
62 static int can_modify_feature(struct btrfs_feature_attr *fa)
66 switch (fa->feature_set) {
68 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
69 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
72 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
73 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
76 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
77 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
80 printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n",
85 if (set & fa->feature_bit)
87 if (clear & fa->feature_bit)
93 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
94 struct kobj_attribute *a, char *buf)
97 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
98 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
100 u64 features = get_features(fs_info, fa->feature_set);
101 if (features & fa->feature_bit)
104 val = can_modify_feature(fa);
106 return snprintf(buf, PAGE_SIZE, "%d\n", val);
109 static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
110 struct kobj_attribute *a,
111 const char *buf, size_t count)
113 struct btrfs_fs_info *fs_info;
114 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
115 u64 features, set, clear;
119 fs_info = to_fs_info(kobj);
123 ret = kstrtoul(skip_spaces(buf), 0, &val);
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;
134 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
135 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
138 features = get_features(fs_info, fa->feature_set);
141 if ((val && (features & fa->feature_bit)) ||
142 (!val && !(features & fa->feature_bit)))
145 if ((val && !(set & fa->feature_bit)) ||
146 (!val && !(clear & fa->feature_bit))) {
148 "%sabling feature %s on mounted fs is not supported.",
149 val ? "En" : "Dis", fa->kobj_attr.attr.name);
153 btrfs_info(fs_info, "%s %s feature flag",
154 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
156 spin_lock(&fs_info->super_lock);
157 features = get_features(fs_info, fa->feature_set);
159 features |= fa->feature_bit;
161 features &= ~fa->feature_bit;
162 set_features(fs_info, fa->feature_set, features);
163 spin_unlock(&fs_info->super_lock);
166 * We don't want to do full transaction commit from inside sysfs
168 btrfs_set_pending(fs_info, COMMIT);
169 wake_up_process(fs_info->transaction_kthread);
174 static umode_t btrfs_feature_visible(struct kobject *kobj,
175 struct attribute *attr, int unused)
177 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
178 umode_t mode = attr->mode;
181 struct btrfs_feature_attr *fa;
184 fa = attr_to_btrfs_feature_attr(attr);
185 features = get_features(fs_info, fa->feature_set);
187 if (can_modify_feature(fa))
189 else if (!(features & fa->feature_bit))
196 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
197 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
198 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
199 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
200 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
201 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
202 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
203 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
204 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
206 static struct attribute *btrfs_supported_feature_attrs[] = {
207 BTRFS_FEAT_ATTR_PTR(mixed_backref),
208 BTRFS_FEAT_ATTR_PTR(default_subvol),
209 BTRFS_FEAT_ATTR_PTR(mixed_groups),
210 BTRFS_FEAT_ATTR_PTR(compress_lzo),
211 BTRFS_FEAT_ATTR_PTR(big_metadata),
212 BTRFS_FEAT_ATTR_PTR(extended_iref),
213 BTRFS_FEAT_ATTR_PTR(raid56),
214 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
215 BTRFS_FEAT_ATTR_PTR(no_holes),
219 static const struct attribute_group btrfs_feature_attr_group = {
221 .is_visible = btrfs_feature_visible,
222 .attrs = btrfs_supported_feature_attrs,
225 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
233 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
236 static ssize_t global_rsv_size_show(struct kobject *kobj,
237 struct kobj_attribute *ka, char *buf)
239 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
240 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
241 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
243 BTRFS_ATTR(global_rsv_size, global_rsv_size_show);
245 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
246 struct kobj_attribute *a, char *buf)
248 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
249 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
250 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
252 BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show);
254 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
255 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
257 static ssize_t raid_bytes_show(struct kobject *kobj,
258 struct kobj_attribute *attr, char *buf);
259 BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
260 BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
262 static ssize_t raid_bytes_show(struct kobject *kobj,
263 struct kobj_attribute *attr, char *buf)
266 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
267 struct btrfs_block_group_cache *block_group;
268 int index = to_raid_kobj(kobj)->raid_type;
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;
276 val += btrfs_block_group_used(&block_group->item);
278 up_read(&sinfo->groups_sem);
279 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
282 static struct attribute *raid_attributes[] = {
283 BTRFS_RAID_ATTR_PTR(total_bytes),
284 BTRFS_RAID_ATTR_PTR(used_bytes),
288 static void release_raid_kobj(struct kobject *kobj)
290 kfree(to_raid_kobj(kobj));
293 struct kobj_type btrfs_raid_ktype = {
294 .sysfs_ops = &kobj_sysfs_ops,
295 .release = release_raid_kobj,
296 .default_attrs = raid_attributes,
299 #define SPACE_INFO_ATTR(field) \
300 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
301 struct kobj_attribute *a, \
304 struct btrfs_space_info *sinfo = to_space_info(kobj); \
305 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
307 BTRFS_ATTR(field, btrfs_space_info_show_##field)
309 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
310 struct kobj_attribute *a,
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);
318 SPACE_INFO_ATTR(flags);
319 SPACE_INFO_ATTR(total_bytes);
320 SPACE_INFO_ATTR(bytes_used);
321 SPACE_INFO_ATTR(bytes_pinned);
322 SPACE_INFO_ATTR(bytes_reserved);
323 SPACE_INFO_ATTR(bytes_may_use);
324 SPACE_INFO_ATTR(disk_used);
325 SPACE_INFO_ATTR(disk_total);
326 BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned);
328 static 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),
341 static void space_info_release(struct kobject *kobj)
343 struct btrfs_space_info *sinfo = to_space_info(kobj);
344 percpu_counter_destroy(&sinfo->total_bytes_pinned);
348 struct kobj_type space_info_ktype = {
349 .sysfs_ops = &kobj_sysfs_ops,
350 .release = space_info_release,
351 .default_attrs = space_info_attrs,
354 static const struct attribute *allocation_attrs[] = {
355 BTRFS_ATTR_PTR(global_rsv_reserved),
356 BTRFS_ATTR_PTR(global_rsv_size),
360 static ssize_t btrfs_label_show(struct kobject *kobj,
361 struct kobj_attribute *a, char *buf)
363 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
364 char *label = fs_info->super_copy->label;
365 return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
368 static ssize_t btrfs_label_store(struct kobject *kobj,
369 struct kobj_attribute *a,
370 const char *buf, size_t len)
372 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
375 if (fs_info->sb->s_flags & MS_RDONLY)
379 * p_len is the len until the first occurrence of either
382 p_len = strcspn(buf, "\n");
384 if (p_len >= BTRFS_LABEL_SIZE)
387 spin_lock(&fs_info->super_lock);
388 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
389 memcpy(fs_info->super_copy->label, buf, p_len);
390 spin_unlock(&fs_info->super_lock);
393 * We don't want to do full transaction commit from inside sysfs
395 btrfs_set_pending(fs_info, COMMIT);
396 wake_up_process(fs_info->transaction_kthread);
400 BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);
402 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
403 struct kobj_attribute *a, char *buf)
405 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
407 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
410 BTRFS_ATTR(nodesize, btrfs_nodesize_show);
412 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
413 struct kobj_attribute *a, char *buf)
415 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
417 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
420 BTRFS_ATTR(sectorsize, btrfs_sectorsize_show);
422 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
423 struct kobj_attribute *a, char *buf)
425 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
427 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
430 BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
432 static const struct attribute *btrfs_attrs[] = {
433 BTRFS_ATTR_PTR(label),
434 BTRFS_ATTR_PTR(nodesize),
435 BTRFS_ATTR_PTR(sectorsize),
436 BTRFS_ATTR_PTR(clone_alignment),
440 static void btrfs_release_super_kobj(struct kobject *kobj)
442 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
444 memset(&fs_devs->super_kobj, 0, sizeof(struct kobject));
445 complete(&fs_devs->kobj_unregister);
448 static struct kobj_type btrfs_ktype = {
449 .sysfs_ops = &kobj_sysfs_ops,
450 .release = btrfs_release_super_kobj,
453 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
455 if (kobj->ktype != &btrfs_ktype)
457 return container_of(kobj, struct btrfs_fs_devices, super_kobj);
460 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
462 if (kobj->ktype != &btrfs_ktype)
464 return to_fs_devs(kobj)->fs_info;
467 #define NUM_FEATURE_BITS 64
468 static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
469 static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
471 static const u64 supported_feature_masks[3] = {
472 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
473 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
474 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
477 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
481 for (set = 0; set < FEAT_MAX; set++) {
483 struct attribute *attrs[2];
484 struct attribute_group agroup = {
488 u64 features = get_features(fs_info, set);
489 features &= ~supported_feature_masks[set];
495 for (i = 0; i < NUM_FEATURE_BITS; i++) {
496 struct btrfs_feature_attr *fa;
498 if (!(features & (1ULL << i)))
501 fa = &btrfs_feature_attrs[set][i];
502 attrs[0] = &fa->kobj_attr.attr;
505 ret = sysfs_merge_group(&fs_info->fs_devices->super_kobj,
510 sysfs_unmerge_group(&fs_info->fs_devices->super_kobj,
518 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
520 if (fs_devs->device_dir_kobj) {
521 kobject_del(fs_devs->device_dir_kobj);
522 kobject_put(fs_devs->device_dir_kobj);
523 fs_devs->device_dir_kobj = NULL;
526 kobject_del(&fs_devs->super_kobj);
527 kobject_put(&fs_devs->super_kobj);
528 wait_for_completion(&fs_devs->kobj_unregister);
531 /* when fs_devs is NULL it will remove all fsid kobject */
532 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
534 struct list_head *fs_uuids = btrfs_get_fs_uuids();
537 __btrfs_sysfs_remove_fsid(fs_devs);
541 list_for_each_entry(fs_devs, fs_uuids, list) {
542 __btrfs_sysfs_remove_fsid(fs_devs);
546 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
548 btrfs_reset_fs_info_ptr(fs_info);
550 if (fs_info->space_info_kobj) {
551 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
552 kobject_del(fs_info->space_info_kobj);
553 kobject_put(fs_info->space_info_kobj);
555 addrm_unknown_feature_attrs(fs_info, false);
556 sysfs_remove_group(&fs_info->fs_devices->super_kobj, &btrfs_feature_attr_group);
557 sysfs_remove_files(&fs_info->fs_devices->super_kobj, btrfs_attrs);
558 btrfs_kobj_rm_device(fs_info->fs_devices, NULL);
561 const char * const btrfs_feature_set_names[3] = {
562 [FEAT_COMPAT] = "compat",
563 [FEAT_COMPAT_RO] = "compat_ro",
564 [FEAT_INCOMPAT] = "incompat",
567 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
569 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
574 str = kmalloc(bufsize, GFP_KERNEL);
578 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
581 if (!(flags & (1ULL << i)))
584 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
585 len += snprintf(str + len, bufsize - len, "%s%s",
586 len ? "," : "", name);
592 static void init_feature_attrs(void)
594 struct btrfs_feature_attr *fa;
597 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
598 ARRAY_SIZE(btrfs_feature_attrs));
599 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
600 ARRAY_SIZE(btrfs_feature_attrs[0]));
602 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
603 memset(btrfs_unknown_feature_names, 0,
604 sizeof(btrfs_unknown_feature_names));
606 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
607 struct btrfs_feature_attr *sfa;
608 struct attribute *a = btrfs_supported_feature_attrs[i];
610 sfa = attr_to_btrfs_feature_attr(a);
611 bit = ilog2(sfa->feature_bit);
612 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
614 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
617 for (set = 0; set < FEAT_MAX; set++) {
618 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
619 char *name = btrfs_unknown_feature_names[set][i];
620 fa = &btrfs_feature_attrs[set][i];
622 if (fa->kobj_attr.attr.name)
625 snprintf(name, 13, "%s:%u",
626 btrfs_feature_set_names[set], i);
628 fa->kobj_attr.attr.name = name;
629 fa->kobj_attr.attr.mode = S_IRUGO;
630 fa->feature_set = set;
631 fa->feature_bit = 1ULL << i;
636 /* when one_device is NULL, it removes all device links */
638 int btrfs_kobj_rm_device(struct btrfs_fs_devices *fs_devices,
639 struct btrfs_device *one_device)
641 struct hd_struct *disk;
642 struct kobject *disk_kobj;
644 if (!fs_devices->device_dir_kobj)
647 if (one_device && one_device->bdev) {
648 disk = one_device->bdev->bd_part;
649 disk_kobj = &part_to_dev(disk)->kobj;
651 sysfs_remove_link(fs_devices->device_dir_kobj,
658 list_for_each_entry(one_device,
659 &fs_devices->devices, dev_list) {
660 if (!one_device->bdev)
662 disk = one_device->bdev->bd_part;
663 disk_kobj = &part_to_dev(disk)->kobj;
665 sysfs_remove_link(fs_devices->device_dir_kobj,
672 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
674 if (!fs_devs->device_dir_kobj)
675 fs_devs->device_dir_kobj = kobject_create_and_add("devices",
676 &fs_devs->super_kobj);
678 if (!fs_devs->device_dir_kobj)
684 int btrfs_kobj_add_device(struct btrfs_fs_devices *fs_devices,
685 struct btrfs_device *one_device)
688 struct btrfs_device *dev;
690 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
691 struct hd_struct *disk;
692 struct kobject *disk_kobj;
697 if (one_device && one_device != dev)
700 disk = dev->bdev->bd_part;
701 disk_kobj = &part_to_dev(disk)->kobj;
703 error = sysfs_create_link(fs_devices->device_dir_kobj,
704 disk_kobj, disk_kobj->name);
712 /* /sys/fs/btrfs/ entry */
713 static struct kset *btrfs_kset;
715 /* /sys/kernel/debug/btrfs */
716 static struct dentry *btrfs_debugfs_root_dentry;
718 /* Debugging tunables and exported data */
719 u64 btrfs_debugfs_test;
722 * Can be called by the device discovery thread.
723 * And parent can be specified for seed device
725 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
726 struct kobject *parent)
730 init_completion(&fs_devs->kobj_unregister);
731 fs_devs->super_kobj.kset = btrfs_kset;
732 error = kobject_init_and_add(&fs_devs->super_kobj, &btrfs_ktype, NULL,
733 "%pU", fs_devs->fsid);
737 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
740 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
741 struct kobject *super_kobj = &fs_devs->super_kobj;
743 btrfs_set_fs_info_ptr(fs_info);
745 error = btrfs_kobj_add_device(fs_devs, NULL);
749 error = sysfs_create_files(super_kobj, btrfs_attrs);
751 btrfs_kobj_rm_device(fs_devs, NULL);
755 error = sysfs_create_group(super_kobj,
756 &btrfs_feature_attr_group);
760 error = addrm_unknown_feature_attrs(fs_info, true);
764 fs_info->space_info_kobj = kobject_create_and_add("allocation",
766 if (!fs_info->space_info_kobj) {
771 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
777 btrfs_sysfs_remove_one(fs_info);
781 static int btrfs_init_debugfs(void)
783 #ifdef CONFIG_DEBUG_FS
784 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
785 if (!btrfs_debugfs_root_dentry)
788 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
789 &btrfs_debugfs_test);
794 int btrfs_init_sysfs(void)
798 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
802 ret = btrfs_init_debugfs();
806 init_feature_attrs();
807 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
813 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
815 kset_unregister(btrfs_kset);
820 void btrfs_exit_sysfs(void)
822 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
823 kset_unregister(btrfs_kset);
824 debugfs_remove_recursive(btrfs_debugfs_root_dentry);