1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/sched.h>
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/completion.h>
10 #include <linux/buffer_head.h>
11 #include <linux/kobject.h>
12 #include <linux/bug.h>
13 #include <linux/genhd.h>
14 #include <linux/debugfs.h>
18 #include "transaction.h"
22 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
23 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
25 static u64 get_features(struct btrfs_fs_info *fs_info,
26 enum btrfs_feature_set set)
28 struct btrfs_super_block *disk_super = fs_info->super_copy;
29 if (set == FEAT_COMPAT)
30 return btrfs_super_compat_flags(disk_super);
31 else if (set == FEAT_COMPAT_RO)
32 return btrfs_super_compat_ro_flags(disk_super);
34 return btrfs_super_incompat_flags(disk_super);
37 static void set_features(struct btrfs_fs_info *fs_info,
38 enum btrfs_feature_set set, u64 features)
40 struct btrfs_super_block *disk_super = fs_info->super_copy;
41 if (set == FEAT_COMPAT)
42 btrfs_set_super_compat_flags(disk_super, features);
43 else if (set == FEAT_COMPAT_RO)
44 btrfs_set_super_compat_ro_flags(disk_super, features);
46 btrfs_set_super_incompat_flags(disk_super, features);
49 static int can_modify_feature(struct btrfs_feature_attr *fa)
53 switch (fa->feature_set) {
55 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
56 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
59 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
60 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
63 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
64 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
67 pr_warn("btrfs: sysfs: unknown feature set %d\n",
72 if (set & fa->feature_bit)
74 if (clear & fa->feature_bit)
80 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
81 struct kobj_attribute *a, char *buf)
84 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
85 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
87 u64 features = get_features(fs_info, fa->feature_set);
88 if (features & fa->feature_bit)
91 val = can_modify_feature(fa);
93 return snprintf(buf, PAGE_SIZE, "%d\n", val);
96 static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
97 struct kobj_attribute *a,
98 const char *buf, size_t count)
100 struct btrfs_fs_info *fs_info;
101 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
102 u64 features, set, clear;
106 fs_info = to_fs_info(kobj);
110 if (sb_rdonly(fs_info->sb))
113 ret = kstrtoul(skip_spaces(buf), 0, &val);
117 if (fa->feature_set == FEAT_COMPAT) {
118 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
119 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
120 } else if (fa->feature_set == FEAT_COMPAT_RO) {
121 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
122 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
124 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
125 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
128 features = get_features(fs_info, fa->feature_set);
131 if ((val && (features & fa->feature_bit)) ||
132 (!val && !(features & fa->feature_bit)))
135 if ((val && !(set & fa->feature_bit)) ||
136 (!val && !(clear & fa->feature_bit))) {
138 "%sabling feature %s on mounted fs is not supported.",
139 val ? "En" : "Dis", fa->kobj_attr.attr.name);
143 btrfs_info(fs_info, "%s %s feature flag",
144 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
146 spin_lock(&fs_info->super_lock);
147 features = get_features(fs_info, fa->feature_set);
149 features |= fa->feature_bit;
151 features &= ~fa->feature_bit;
152 set_features(fs_info, fa->feature_set, features);
153 spin_unlock(&fs_info->super_lock);
156 * We don't want to do full transaction commit from inside sysfs
158 btrfs_set_pending(fs_info, COMMIT);
159 wake_up_process(fs_info->transaction_kthread);
164 static umode_t btrfs_feature_visible(struct kobject *kobj,
165 struct attribute *attr, int unused)
167 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
168 umode_t mode = attr->mode;
171 struct btrfs_feature_attr *fa;
174 fa = attr_to_btrfs_feature_attr(attr);
175 features = get_features(fs_info, fa->feature_set);
177 if (can_modify_feature(fa))
179 else if (!(features & fa->feature_bit))
186 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
187 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
188 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
189 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
190 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
191 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
192 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
193 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
194 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
195 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
196 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
198 static struct attribute *btrfs_supported_feature_attrs[] = {
199 BTRFS_FEAT_ATTR_PTR(mixed_backref),
200 BTRFS_FEAT_ATTR_PTR(default_subvol),
201 BTRFS_FEAT_ATTR_PTR(mixed_groups),
202 BTRFS_FEAT_ATTR_PTR(compress_lzo),
203 BTRFS_FEAT_ATTR_PTR(compress_zstd),
204 BTRFS_FEAT_ATTR_PTR(big_metadata),
205 BTRFS_FEAT_ATTR_PTR(extended_iref),
206 BTRFS_FEAT_ATTR_PTR(raid56),
207 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
208 BTRFS_FEAT_ATTR_PTR(no_holes),
209 BTRFS_FEAT_ATTR_PTR(free_space_tree),
213 static const struct attribute_group btrfs_feature_attr_group = {
215 .is_visible = btrfs_feature_visible,
216 .attrs = btrfs_supported_feature_attrs,
219 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
227 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
230 static ssize_t global_rsv_size_show(struct kobject *kobj,
231 struct kobj_attribute *ka, char *buf)
233 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
234 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
235 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
237 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
239 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
240 struct kobj_attribute *a, char *buf)
242 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
243 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
244 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
246 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
248 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
249 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
251 static ssize_t raid_bytes_show(struct kobject *kobj,
252 struct kobj_attribute *attr, char *buf);
253 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
254 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
256 static ssize_t raid_bytes_show(struct kobject *kobj,
257 struct kobj_attribute *attr, char *buf)
260 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
261 struct btrfs_block_group_cache *block_group;
262 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
265 down_read(&sinfo->groups_sem);
266 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
267 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
268 val += block_group->key.offset;
270 val += btrfs_block_group_used(&block_group->item);
272 up_read(&sinfo->groups_sem);
273 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
276 static struct attribute *raid_attributes[] = {
277 BTRFS_ATTR_PTR(raid, total_bytes),
278 BTRFS_ATTR_PTR(raid, used_bytes),
282 static void release_raid_kobj(struct kobject *kobj)
284 kfree(to_raid_kobj(kobj));
287 struct kobj_type btrfs_raid_ktype = {
288 .sysfs_ops = &kobj_sysfs_ops,
289 .release = release_raid_kobj,
290 .default_attrs = raid_attributes,
293 #define SPACE_INFO_ATTR(field) \
294 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
295 struct kobj_attribute *a, \
298 struct btrfs_space_info *sinfo = to_space_info(kobj); \
299 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
301 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
303 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
304 struct kobj_attribute *a,
307 struct btrfs_space_info *sinfo = to_space_info(kobj);
308 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
309 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
312 SPACE_INFO_ATTR(flags);
313 SPACE_INFO_ATTR(total_bytes);
314 SPACE_INFO_ATTR(bytes_used);
315 SPACE_INFO_ATTR(bytes_pinned);
316 SPACE_INFO_ATTR(bytes_reserved);
317 SPACE_INFO_ATTR(bytes_may_use);
318 SPACE_INFO_ATTR(bytes_readonly);
319 SPACE_INFO_ATTR(disk_used);
320 SPACE_INFO_ATTR(disk_total);
321 BTRFS_ATTR(space_info, total_bytes_pinned,
322 btrfs_space_info_show_total_bytes_pinned);
324 static struct attribute *space_info_attrs[] = {
325 BTRFS_ATTR_PTR(space_info, flags),
326 BTRFS_ATTR_PTR(space_info, total_bytes),
327 BTRFS_ATTR_PTR(space_info, bytes_used),
328 BTRFS_ATTR_PTR(space_info, bytes_pinned),
329 BTRFS_ATTR_PTR(space_info, bytes_reserved),
330 BTRFS_ATTR_PTR(space_info, bytes_may_use),
331 BTRFS_ATTR_PTR(space_info, bytes_readonly),
332 BTRFS_ATTR_PTR(space_info, disk_used),
333 BTRFS_ATTR_PTR(space_info, disk_total),
334 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
338 static void space_info_release(struct kobject *kobj)
340 struct btrfs_space_info *sinfo = to_space_info(kobj);
341 percpu_counter_destroy(&sinfo->total_bytes_pinned);
345 struct kobj_type space_info_ktype = {
346 .sysfs_ops = &kobj_sysfs_ops,
347 .release = space_info_release,
348 .default_attrs = space_info_attrs,
351 static const struct attribute *allocation_attrs[] = {
352 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
353 BTRFS_ATTR_PTR(allocation, global_rsv_size),
357 static ssize_t btrfs_label_show(struct kobject *kobj,
358 struct kobj_attribute *a, char *buf)
360 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
361 char *label = fs_info->super_copy->label;
364 spin_lock(&fs_info->super_lock);
365 ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
366 spin_unlock(&fs_info->super_lock);
371 static ssize_t btrfs_label_store(struct kobject *kobj,
372 struct kobj_attribute *a,
373 const char *buf, size_t len)
375 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
381 if (sb_rdonly(fs_info->sb))
385 * p_len is the len until the first occurrence of either
388 p_len = strcspn(buf, "\n");
390 if (p_len >= BTRFS_LABEL_SIZE)
393 spin_lock(&fs_info->super_lock);
394 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
395 memcpy(fs_info->super_copy->label, buf, p_len);
396 spin_unlock(&fs_info->super_lock);
399 * We don't want to do full transaction commit from inside sysfs
401 btrfs_set_pending(fs_info, COMMIT);
402 wake_up_process(fs_info->transaction_kthread);
406 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
408 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
409 struct kobj_attribute *a, char *buf)
411 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
413 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
416 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
418 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
419 struct kobj_attribute *a, char *buf)
421 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
423 return snprintf(buf, PAGE_SIZE, "%u\n",
424 fs_info->super_copy->sectorsize);
427 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
429 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
430 struct kobj_attribute *a, char *buf)
432 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
434 return snprintf(buf, PAGE_SIZE, "%u\n",
435 fs_info->super_copy->sectorsize);
438 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
440 static ssize_t quota_override_show(struct kobject *kobj,
441 struct kobj_attribute *a, char *buf)
443 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
446 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
447 return snprintf(buf, PAGE_SIZE, "%d\n", quota_override);
450 static ssize_t quota_override_store(struct kobject *kobj,
451 struct kobj_attribute *a,
452 const char *buf, size_t len)
454 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
461 if (!capable(CAP_SYS_RESOURCE))
464 err = kstrtoul(buf, 10, &knob);
471 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
473 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
478 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
480 static const struct attribute *btrfs_attrs[] = {
481 BTRFS_ATTR_PTR(, label),
482 BTRFS_ATTR_PTR(, nodesize),
483 BTRFS_ATTR_PTR(, sectorsize),
484 BTRFS_ATTR_PTR(, clone_alignment),
485 BTRFS_ATTR_PTR(, quota_override),
489 static void btrfs_release_fsid_kobj(struct kobject *kobj)
491 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
493 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
494 complete(&fs_devs->kobj_unregister);
497 static struct kobj_type btrfs_ktype = {
498 .sysfs_ops = &kobj_sysfs_ops,
499 .release = btrfs_release_fsid_kobj,
502 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
504 if (kobj->ktype != &btrfs_ktype)
506 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
509 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
511 if (kobj->ktype != &btrfs_ktype)
513 return to_fs_devs(kobj)->fs_info;
516 #define NUM_FEATURE_BITS 64
517 static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
518 static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
520 static const u64 supported_feature_masks[3] = {
521 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
522 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
523 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
526 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
530 for (set = 0; set < FEAT_MAX; set++) {
532 struct attribute *attrs[2];
533 struct attribute_group agroup = {
537 u64 features = get_features(fs_info, set);
538 features &= ~supported_feature_masks[set];
544 for (i = 0; i < NUM_FEATURE_BITS; i++) {
545 struct btrfs_feature_attr *fa;
547 if (!(features & (1ULL << i)))
550 fa = &btrfs_feature_attrs[set][i];
551 attrs[0] = &fa->kobj_attr.attr;
554 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
559 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
567 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
569 if (fs_devs->device_dir_kobj) {
570 kobject_del(fs_devs->device_dir_kobj);
571 kobject_put(fs_devs->device_dir_kobj);
572 fs_devs->device_dir_kobj = NULL;
575 if (fs_devs->fsid_kobj.state_initialized) {
576 kobject_del(&fs_devs->fsid_kobj);
577 kobject_put(&fs_devs->fsid_kobj);
578 wait_for_completion(&fs_devs->kobj_unregister);
582 /* when fs_devs is NULL it will remove all fsid kobject */
583 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
585 struct list_head *fs_uuids = btrfs_get_fs_uuids();
588 __btrfs_sysfs_remove_fsid(fs_devs);
592 list_for_each_entry(fs_devs, fs_uuids, list) {
593 __btrfs_sysfs_remove_fsid(fs_devs);
597 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
599 btrfs_reset_fs_info_ptr(fs_info);
601 if (fs_info->space_info_kobj) {
602 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
603 kobject_del(fs_info->space_info_kobj);
604 kobject_put(fs_info->space_info_kobj);
606 addrm_unknown_feature_attrs(fs_info, false);
607 sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group);
608 sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs);
609 btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL);
612 const char * const btrfs_feature_set_names[3] = {
613 [FEAT_COMPAT] = "compat",
614 [FEAT_COMPAT_RO] = "compat_ro",
615 [FEAT_INCOMPAT] = "incompat",
618 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
620 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
625 str = kmalloc(bufsize, GFP_KERNEL);
629 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
632 if (!(flags & (1ULL << i)))
635 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
636 len += snprintf(str + len, bufsize - len, "%s%s",
637 len ? "," : "", name);
643 static void init_feature_attrs(void)
645 struct btrfs_feature_attr *fa;
648 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
649 ARRAY_SIZE(btrfs_feature_attrs));
650 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
651 ARRAY_SIZE(btrfs_feature_attrs[0]));
653 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
654 memset(btrfs_unknown_feature_names, 0,
655 sizeof(btrfs_unknown_feature_names));
657 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
658 struct btrfs_feature_attr *sfa;
659 struct attribute *a = btrfs_supported_feature_attrs[i];
661 sfa = attr_to_btrfs_feature_attr(a);
662 bit = ilog2(sfa->feature_bit);
663 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
665 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
668 for (set = 0; set < FEAT_MAX; set++) {
669 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
670 char *name = btrfs_unknown_feature_names[set][i];
671 fa = &btrfs_feature_attrs[set][i];
673 if (fa->kobj_attr.attr.name)
676 snprintf(name, 13, "%s:%u",
677 btrfs_feature_set_names[set], i);
679 fa->kobj_attr.attr.name = name;
680 fa->kobj_attr.attr.mode = S_IRUGO;
681 fa->feature_set = set;
682 fa->feature_bit = 1ULL << i;
687 /* when one_device is NULL, it removes all device links */
689 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
690 struct btrfs_device *one_device)
692 struct hd_struct *disk;
693 struct kobject *disk_kobj;
695 if (!fs_devices->device_dir_kobj)
698 if (one_device && one_device->bdev) {
699 disk = one_device->bdev->bd_part;
700 disk_kobj = &part_to_dev(disk)->kobj;
702 sysfs_remove_link(fs_devices->device_dir_kobj,
709 list_for_each_entry(one_device,
710 &fs_devices->devices, dev_list) {
711 if (!one_device->bdev)
713 disk = one_device->bdev->bd_part;
714 disk_kobj = &part_to_dev(disk)->kobj;
716 sysfs_remove_link(fs_devices->device_dir_kobj,
723 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
725 if (!fs_devs->device_dir_kobj)
726 fs_devs->device_dir_kobj = kobject_create_and_add("devices",
727 &fs_devs->fsid_kobj);
729 if (!fs_devs->device_dir_kobj)
735 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
736 struct btrfs_device *one_device)
739 struct btrfs_device *dev;
741 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
742 struct hd_struct *disk;
743 struct kobject *disk_kobj;
748 if (one_device && one_device != dev)
751 disk = dev->bdev->bd_part;
752 disk_kobj = &part_to_dev(disk)->kobj;
754 error = sysfs_create_link(fs_devices->device_dir_kobj,
755 disk_kobj, disk_kobj->name);
763 /* /sys/fs/btrfs/ entry */
764 static struct kset *btrfs_kset;
766 /* /sys/kernel/debug/btrfs */
767 static struct dentry *btrfs_debugfs_root_dentry;
769 /* Debugging tunables and exported data */
770 u64 btrfs_debugfs_test;
773 * Can be called by the device discovery thread.
774 * And parent can be specified for seed device
776 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
777 struct kobject *parent)
781 init_completion(&fs_devs->kobj_unregister);
782 fs_devs->fsid_kobj.kset = btrfs_kset;
783 error = kobject_init_and_add(&fs_devs->fsid_kobj,
784 &btrfs_ktype, parent, "%pU", fs_devs->fsid);
788 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
791 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
792 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
794 btrfs_set_fs_info_ptr(fs_info);
796 error = btrfs_sysfs_add_device_link(fs_devs, NULL);
800 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
802 btrfs_sysfs_rm_device_link(fs_devs, NULL);
806 error = sysfs_create_group(fsid_kobj,
807 &btrfs_feature_attr_group);
811 error = addrm_unknown_feature_attrs(fs_info, true);
815 fs_info->space_info_kobj = kobject_create_and_add("allocation",
817 if (!fs_info->space_info_kobj) {
822 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
828 btrfs_sysfs_remove_mounted(fs_info);
834 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
835 * values in superblock. Call after any changes to incompat/compat_ro flags
837 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
838 u64 bit, enum btrfs_feature_set set)
840 struct btrfs_fs_devices *fs_devs;
841 struct kobject *fsid_kobj;
848 features = get_features(fs_info, set);
849 ASSERT(bit & supported_feature_masks[set]);
851 fs_devs = fs_info->fs_devices;
852 fsid_kobj = &fs_devs->fsid_kobj;
854 if (!fsid_kobj->state_initialized)
858 * FIXME: this is too heavy to update just one value, ideally we'd like
859 * to use sysfs_update_group but some refactoring is needed first.
861 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
862 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
865 static int btrfs_init_debugfs(void)
867 #ifdef CONFIG_DEBUG_FS
868 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
869 if (!btrfs_debugfs_root_dentry)
873 * Example code, how to export data through debugfs.
875 * file: /sys/kernel/debug/btrfs/test
876 * contents of: btrfs_debugfs_test
878 #ifdef CONFIG_BTRFS_DEBUG
879 debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry,
880 &btrfs_debugfs_test);
887 int __init btrfs_init_sysfs(void)
891 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
895 ret = btrfs_init_debugfs();
899 init_feature_attrs();
900 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
906 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
908 kset_unregister(btrfs_kset);
913 void __cold btrfs_exit_sysfs(void)
915 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
916 kset_unregister(btrfs_kset);
917 debugfs_remove_recursive(btrfs_debugfs_root_dentry);