1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/sched.h>
7 #include <linux/sched/mm.h>
8 #include <linux/slab.h>
9 #include <linux/spinlock.h>
10 #include <linux/completion.h>
11 #include <linux/bug.h>
12 #include <crypto/hash.h>
18 #include "transaction.h"
21 #include "space-info.h"
22 #include "block-group.h"
25 struct btrfs_feature_attr {
26 struct kobj_attribute kobj_attr;
27 enum btrfs_feature_set feature_set;
31 /* For raid type sysfs entries */
37 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
39 .attr = { .name = __stringify(_name), .mode = _mode }, \
44 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
45 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
46 __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
48 #define BTRFS_ATTR(_prefix, _name, _show) \
49 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
50 __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
52 #define BTRFS_ATTR_PTR(_prefix, _name) \
53 (&btrfs_attr_##_prefix##_##_name.attr)
55 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \
56 static struct btrfs_feature_attr btrfs_attr_features_##_name = { \
57 .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
58 btrfs_feature_attr_show, \
59 btrfs_feature_attr_store), \
60 .feature_set = _feature_set, \
61 .feature_bit = _feature_prefix ##_## _feature_bit, \
63 #define BTRFS_FEAT_ATTR_PTR(_name) \
64 (&btrfs_attr_features_##_name.kobj_attr.attr)
66 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
67 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
68 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
69 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
70 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
71 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
73 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
74 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
76 static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a)
78 return container_of(a, struct btrfs_feature_attr, kobj_attr);
81 static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
83 return container_of(attr, struct kobj_attribute, attr);
86 static struct btrfs_feature_attr *attr_to_btrfs_feature_attr(
87 struct attribute *attr)
89 return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
92 static u64 get_features(struct btrfs_fs_info *fs_info,
93 enum btrfs_feature_set set)
95 struct btrfs_super_block *disk_super = fs_info->super_copy;
96 if (set == FEAT_COMPAT)
97 return btrfs_super_compat_flags(disk_super);
98 else if (set == FEAT_COMPAT_RO)
99 return btrfs_super_compat_ro_flags(disk_super);
101 return btrfs_super_incompat_flags(disk_super);
104 static void set_features(struct btrfs_fs_info *fs_info,
105 enum btrfs_feature_set set, u64 features)
107 struct btrfs_super_block *disk_super = fs_info->super_copy;
108 if (set == FEAT_COMPAT)
109 btrfs_set_super_compat_flags(disk_super, features);
110 else if (set == FEAT_COMPAT_RO)
111 btrfs_set_super_compat_ro_flags(disk_super, features);
113 btrfs_set_super_incompat_flags(disk_super, features);
116 static int can_modify_feature(struct btrfs_feature_attr *fa)
120 switch (fa->feature_set) {
122 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
123 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
126 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
127 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
130 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
131 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
134 pr_warn("btrfs: sysfs: unknown feature set %d\n",
139 if (set & fa->feature_bit)
141 if (clear & fa->feature_bit)
147 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
148 struct kobj_attribute *a, char *buf)
151 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
152 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
154 u64 features = get_features(fs_info, fa->feature_set);
155 if (features & fa->feature_bit)
158 val = can_modify_feature(fa);
160 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
163 static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
164 struct kobj_attribute *a,
165 const char *buf, size_t count)
167 struct btrfs_fs_info *fs_info;
168 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
169 u64 features, set, clear;
173 fs_info = to_fs_info(kobj);
177 if (sb_rdonly(fs_info->sb))
180 ret = kstrtoul(skip_spaces(buf), 0, &val);
184 if (fa->feature_set == FEAT_COMPAT) {
185 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
186 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
187 } else if (fa->feature_set == FEAT_COMPAT_RO) {
188 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
189 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
191 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
192 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
195 features = get_features(fs_info, fa->feature_set);
198 if ((val && (features & fa->feature_bit)) ||
199 (!val && !(features & fa->feature_bit)))
202 if ((val && !(set & fa->feature_bit)) ||
203 (!val && !(clear & fa->feature_bit))) {
205 "%sabling feature %s on mounted fs is not supported.",
206 val ? "En" : "Dis", fa->kobj_attr.attr.name);
210 btrfs_info(fs_info, "%s %s feature flag",
211 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
213 spin_lock(&fs_info->super_lock);
214 features = get_features(fs_info, fa->feature_set);
216 features |= fa->feature_bit;
218 features &= ~fa->feature_bit;
219 set_features(fs_info, fa->feature_set, features);
220 spin_unlock(&fs_info->super_lock);
223 * We don't want to do full transaction commit from inside sysfs
225 btrfs_set_pending(fs_info, COMMIT);
226 wake_up_process(fs_info->transaction_kthread);
231 static umode_t btrfs_feature_visible(struct kobject *kobj,
232 struct attribute *attr, int unused)
234 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
235 umode_t mode = attr->mode;
238 struct btrfs_feature_attr *fa;
241 fa = attr_to_btrfs_feature_attr(attr);
242 features = get_features(fs_info, fa->feature_set);
244 if (can_modify_feature(fa))
246 else if (!(features & fa->feature_bit))
253 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
254 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
255 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
256 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
257 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
258 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
259 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
260 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
261 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
262 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
263 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
264 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
265 BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
267 static struct attribute *btrfs_supported_feature_attrs[] = {
268 BTRFS_FEAT_ATTR_PTR(mixed_backref),
269 BTRFS_FEAT_ATTR_PTR(default_subvol),
270 BTRFS_FEAT_ATTR_PTR(mixed_groups),
271 BTRFS_FEAT_ATTR_PTR(compress_lzo),
272 BTRFS_FEAT_ATTR_PTR(compress_zstd),
273 BTRFS_FEAT_ATTR_PTR(big_metadata),
274 BTRFS_FEAT_ATTR_PTR(extended_iref),
275 BTRFS_FEAT_ATTR_PTR(raid56),
276 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
277 BTRFS_FEAT_ATTR_PTR(no_holes),
278 BTRFS_FEAT_ATTR_PTR(metadata_uuid),
279 BTRFS_FEAT_ATTR_PTR(free_space_tree),
280 BTRFS_FEAT_ATTR_PTR(raid1c34),
285 * Features which depend on feature bits and may differ between each fs.
287 * /sys/fs/btrfs/features lists all available features of this kernel while
288 * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
289 * can be changed online.
291 static const struct attribute_group btrfs_feature_attr_group = {
293 .is_visible = btrfs_feature_visible,
294 .attrs = btrfs_supported_feature_attrs,
297 static ssize_t rmdir_subvol_show(struct kobject *kobj,
298 struct kobj_attribute *ka, char *buf)
300 return scnprintf(buf, PAGE_SIZE, "0\n");
302 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
304 static ssize_t supported_checksums_show(struct kobject *kobj,
305 struct kobj_attribute *a, char *buf)
310 for (i = 0; i < btrfs_get_num_csums(); i++) {
312 * This "trick" only works as long as 'enum btrfs_csum_type' has
315 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
316 (i == 0 ? "" : " "), btrfs_super_csum_name(i));
320 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
323 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
325 static ssize_t send_stream_version_show(struct kobject *kobj,
326 struct kobj_attribute *ka, char *buf)
328 return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION);
330 BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);
332 static struct attribute *btrfs_supported_static_feature_attrs[] = {
333 BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
334 BTRFS_ATTR_PTR(static_feature, supported_checksums),
335 BTRFS_ATTR_PTR(static_feature, send_stream_version),
340 * Features which only depend on kernel version.
342 * These are listed in /sys/fs/btrfs/features along with
343 * btrfs_feature_attr_group
345 static const struct attribute_group btrfs_static_feature_attr_group = {
347 .attrs = btrfs_supported_static_feature_attrs,
350 #ifdef CONFIG_BTRFS_DEBUG
353 * Discard statistics and tunables
355 #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent)
357 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
358 struct kobj_attribute *a,
361 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
363 return scnprintf(buf, PAGE_SIZE, "%lld\n",
364 atomic64_read(&fs_info->discard_ctl.discardable_bytes));
366 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
368 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
369 struct kobj_attribute *a,
372 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
374 return scnprintf(buf, PAGE_SIZE, "%d\n",
375 atomic_read(&fs_info->discard_ctl.discardable_extents));
377 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
379 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
380 struct kobj_attribute *a,
383 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
385 return scnprintf(buf, PAGE_SIZE, "%lld\n",
386 fs_info->discard_ctl.discard_bitmap_bytes);
388 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
390 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
391 struct kobj_attribute *a,
394 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
396 return scnprintf(buf, PAGE_SIZE, "%lld\n",
397 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
399 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
401 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
402 struct kobj_attribute *a,
405 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
407 return scnprintf(buf, PAGE_SIZE, "%lld\n",
408 fs_info->discard_ctl.discard_extent_bytes);
410 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
412 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
413 struct kobj_attribute *a,
416 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
418 return scnprintf(buf, PAGE_SIZE, "%u\n",
419 READ_ONCE(fs_info->discard_ctl.iops_limit));
422 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
423 struct kobj_attribute *a,
424 const char *buf, size_t len)
426 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
427 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
431 ret = kstrtou32(buf, 10, &iops_limit);
435 WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
439 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
440 btrfs_discard_iops_limit_store);
442 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
443 struct kobj_attribute *a,
446 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
448 return scnprintf(buf, PAGE_SIZE, "%u\n",
449 READ_ONCE(fs_info->discard_ctl.kbps_limit));
452 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
453 struct kobj_attribute *a,
454 const char *buf, size_t len)
456 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
457 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
461 ret = kstrtou32(buf, 10, &kbps_limit);
465 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
469 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
470 btrfs_discard_kbps_limit_store);
472 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
473 struct kobj_attribute *a,
476 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
478 return scnprintf(buf, PAGE_SIZE, "%llu\n",
479 READ_ONCE(fs_info->discard_ctl.max_discard_size));
482 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
483 struct kobj_attribute *a,
484 const char *buf, size_t len)
486 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
487 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
488 u64 max_discard_size;
491 ret = kstrtou64(buf, 10, &max_discard_size);
495 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
499 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
500 btrfs_discard_max_discard_size_store);
502 static const struct attribute *discard_debug_attrs[] = {
503 BTRFS_ATTR_PTR(discard, discardable_bytes),
504 BTRFS_ATTR_PTR(discard, discardable_extents),
505 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
506 BTRFS_ATTR_PTR(discard, discard_bytes_saved),
507 BTRFS_ATTR_PTR(discard, discard_extent_bytes),
508 BTRFS_ATTR_PTR(discard, iops_limit),
509 BTRFS_ATTR_PTR(discard, kbps_limit),
510 BTRFS_ATTR_PTR(discard, max_discard_size),
515 * Runtime debugging exported via sysfs
517 * /sys/fs/btrfs/debug - applies to module or all filesystems
518 * /sys/fs/btrfs/UUID - applies only to the given filesystem
520 static const struct attribute *btrfs_debug_mount_attrs[] = {
524 static struct attribute *btrfs_debug_feature_attrs[] = {
528 static const struct attribute_group btrfs_debug_feature_attr_group = {
530 .attrs = btrfs_debug_feature_attrs,
535 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
543 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
546 static ssize_t global_rsv_size_show(struct kobject *kobj,
547 struct kobj_attribute *ka, char *buf)
549 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
550 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
551 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
553 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
555 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
556 struct kobj_attribute *a, char *buf)
558 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
559 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
560 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
562 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
564 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
565 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
567 static ssize_t raid_bytes_show(struct kobject *kobj,
568 struct kobj_attribute *attr, char *buf);
569 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
570 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
572 static ssize_t raid_bytes_show(struct kobject *kobj,
573 struct kobj_attribute *attr, char *buf)
576 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
577 struct btrfs_block_group *block_group;
578 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
581 down_read(&sinfo->groups_sem);
582 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
583 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
584 val += block_group->length;
586 val += block_group->used;
588 up_read(&sinfo->groups_sem);
589 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
592 static struct attribute *raid_attrs[] = {
593 BTRFS_ATTR_PTR(raid, total_bytes),
594 BTRFS_ATTR_PTR(raid, used_bytes),
597 ATTRIBUTE_GROUPS(raid);
599 static void release_raid_kobj(struct kobject *kobj)
601 kfree(to_raid_kobj(kobj));
604 static struct kobj_type btrfs_raid_ktype = {
605 .sysfs_ops = &kobj_sysfs_ops,
606 .release = release_raid_kobj,
607 .default_groups = raid_groups,
610 #define SPACE_INFO_ATTR(field) \
611 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
612 struct kobj_attribute *a, \
615 struct btrfs_space_info *sinfo = to_space_info(kobj); \
616 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
618 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
620 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
621 struct kobj_attribute *a,
624 struct btrfs_space_info *sinfo = to_space_info(kobj);
625 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
626 return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
629 SPACE_INFO_ATTR(flags);
630 SPACE_INFO_ATTR(total_bytes);
631 SPACE_INFO_ATTR(bytes_used);
632 SPACE_INFO_ATTR(bytes_pinned);
633 SPACE_INFO_ATTR(bytes_reserved);
634 SPACE_INFO_ATTR(bytes_may_use);
635 SPACE_INFO_ATTR(bytes_readonly);
636 SPACE_INFO_ATTR(disk_used);
637 SPACE_INFO_ATTR(disk_total);
638 BTRFS_ATTR(space_info, total_bytes_pinned,
639 btrfs_space_info_show_total_bytes_pinned);
641 static struct attribute *space_info_attrs[] = {
642 BTRFS_ATTR_PTR(space_info, flags),
643 BTRFS_ATTR_PTR(space_info, total_bytes),
644 BTRFS_ATTR_PTR(space_info, bytes_used),
645 BTRFS_ATTR_PTR(space_info, bytes_pinned),
646 BTRFS_ATTR_PTR(space_info, bytes_reserved),
647 BTRFS_ATTR_PTR(space_info, bytes_may_use),
648 BTRFS_ATTR_PTR(space_info, bytes_readonly),
649 BTRFS_ATTR_PTR(space_info, disk_used),
650 BTRFS_ATTR_PTR(space_info, disk_total),
651 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
654 ATTRIBUTE_GROUPS(space_info);
656 static void space_info_release(struct kobject *kobj)
658 struct btrfs_space_info *sinfo = to_space_info(kobj);
659 percpu_counter_destroy(&sinfo->total_bytes_pinned);
663 static struct kobj_type space_info_ktype = {
664 .sysfs_ops = &kobj_sysfs_ops,
665 .release = space_info_release,
666 .default_groups = space_info_groups,
669 static const struct attribute *allocation_attrs[] = {
670 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
671 BTRFS_ATTR_PTR(allocation, global_rsv_size),
675 static ssize_t btrfs_label_show(struct kobject *kobj,
676 struct kobj_attribute *a, char *buf)
678 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
679 char *label = fs_info->super_copy->label;
682 spin_lock(&fs_info->super_lock);
683 ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
684 spin_unlock(&fs_info->super_lock);
689 static ssize_t btrfs_label_store(struct kobject *kobj,
690 struct kobj_attribute *a,
691 const char *buf, size_t len)
693 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
699 if (sb_rdonly(fs_info->sb))
703 * p_len is the len until the first occurrence of either
706 p_len = strcspn(buf, "\n");
708 if (p_len >= BTRFS_LABEL_SIZE)
711 spin_lock(&fs_info->super_lock);
712 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
713 memcpy(fs_info->super_copy->label, buf, p_len);
714 spin_unlock(&fs_info->super_lock);
717 * We don't want to do full transaction commit from inside sysfs
719 btrfs_set_pending(fs_info, COMMIT);
720 wake_up_process(fs_info->transaction_kthread);
724 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
726 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
727 struct kobj_attribute *a, char *buf)
729 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
731 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
734 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
736 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
737 struct kobj_attribute *a, char *buf)
739 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
741 return scnprintf(buf, PAGE_SIZE, "%u\n",
742 fs_info->super_copy->sectorsize);
745 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
747 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
748 struct kobj_attribute *a, char *buf)
750 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
752 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
755 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
757 static ssize_t quota_override_show(struct kobject *kobj,
758 struct kobj_attribute *a, char *buf)
760 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
763 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
764 return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
767 static ssize_t quota_override_store(struct kobject *kobj,
768 struct kobj_attribute *a,
769 const char *buf, size_t len)
771 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
778 if (!capable(CAP_SYS_RESOURCE))
781 err = kstrtoul(buf, 10, &knob);
788 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
790 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
795 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
797 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
798 struct kobj_attribute *a, char *buf)
800 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
802 return scnprintf(buf, PAGE_SIZE, "%pU\n",
803 fs_info->fs_devices->metadata_uuid);
806 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
808 static ssize_t btrfs_checksum_show(struct kobject *kobj,
809 struct kobj_attribute *a, char *buf)
811 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
812 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
814 return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
815 btrfs_super_csum_name(csum_type),
816 crypto_shash_driver_name(fs_info->csum_shash));
819 BTRFS_ATTR(, checksum, btrfs_checksum_show);
821 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
822 struct kobj_attribute *a, char *buf)
824 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
827 switch (READ_ONCE(fs_info->exclusive_operation)) {
828 case BTRFS_EXCLOP_NONE:
831 case BTRFS_EXCLOP_BALANCE:
834 case BTRFS_EXCLOP_DEV_ADD:
835 str = "device add\n";
837 case BTRFS_EXCLOP_DEV_REMOVE:
838 str = "device remove\n";
840 case BTRFS_EXCLOP_DEV_REPLACE:
841 str = "device replace\n";
843 case BTRFS_EXCLOP_RESIZE:
846 case BTRFS_EXCLOP_SWAP_ACTIVATE:
847 str = "swap activate\n";
853 return scnprintf(buf, PAGE_SIZE, "%s", str);
855 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
857 static const struct attribute *btrfs_attrs[] = {
858 BTRFS_ATTR_PTR(, label),
859 BTRFS_ATTR_PTR(, nodesize),
860 BTRFS_ATTR_PTR(, sectorsize),
861 BTRFS_ATTR_PTR(, clone_alignment),
862 BTRFS_ATTR_PTR(, quota_override),
863 BTRFS_ATTR_PTR(, metadata_uuid),
864 BTRFS_ATTR_PTR(, checksum),
865 BTRFS_ATTR_PTR(, exclusive_operation),
869 static void btrfs_release_fsid_kobj(struct kobject *kobj)
871 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
873 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
874 complete(&fs_devs->kobj_unregister);
877 static struct kobj_type btrfs_ktype = {
878 .sysfs_ops = &kobj_sysfs_ops,
879 .release = btrfs_release_fsid_kobj,
882 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
884 if (kobj->ktype != &btrfs_ktype)
886 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
889 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
891 if (kobj->ktype != &btrfs_ktype)
893 return to_fs_devs(kobj)->fs_info;
896 #define NUM_FEATURE_BITS 64
897 #define BTRFS_FEATURE_NAME_MAX 13
898 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
899 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
901 static const u64 supported_feature_masks[FEAT_MAX] = {
902 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
903 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
904 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
907 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
911 for (set = 0; set < FEAT_MAX; set++) {
913 struct attribute *attrs[2];
914 struct attribute_group agroup = {
918 u64 features = get_features(fs_info, set);
919 features &= ~supported_feature_masks[set];
925 for (i = 0; i < NUM_FEATURE_BITS; i++) {
926 struct btrfs_feature_attr *fa;
928 if (!(features & (1ULL << i)))
931 fa = &btrfs_feature_attrs[set][i];
932 attrs[0] = &fa->kobj_attr.attr;
935 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
940 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
948 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
950 if (fs_devs->devinfo_kobj) {
951 kobject_del(fs_devs->devinfo_kobj);
952 kobject_put(fs_devs->devinfo_kobj);
953 fs_devs->devinfo_kobj = NULL;
956 if (fs_devs->devices_kobj) {
957 kobject_del(fs_devs->devices_kobj);
958 kobject_put(fs_devs->devices_kobj);
959 fs_devs->devices_kobj = NULL;
962 if (fs_devs->fsid_kobj.state_initialized) {
963 kobject_del(&fs_devs->fsid_kobj);
964 kobject_put(&fs_devs->fsid_kobj);
965 wait_for_completion(&fs_devs->kobj_unregister);
969 /* when fs_devs is NULL it will remove all fsid kobject */
970 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
972 struct list_head *fs_uuids = btrfs_get_fs_uuids();
975 __btrfs_sysfs_remove_fsid(fs_devs);
979 list_for_each_entry(fs_devs, fs_uuids, fs_list) {
980 __btrfs_sysfs_remove_fsid(fs_devs);
984 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
986 struct btrfs_device *device;
987 struct btrfs_fs_devices *seed;
989 list_for_each_entry(device, &fs_devices->devices, dev_list)
990 btrfs_sysfs_remove_device(device);
992 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
993 list_for_each_entry(device, &seed->devices, dev_list)
994 btrfs_sysfs_remove_device(device);
998 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
1000 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1002 sysfs_remove_link(fsid_kobj, "bdi");
1004 if (fs_info->space_info_kobj) {
1005 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
1006 kobject_del(fs_info->space_info_kobj);
1007 kobject_put(fs_info->space_info_kobj);
1009 #ifdef CONFIG_BTRFS_DEBUG
1010 if (fs_info->discard_debug_kobj) {
1011 sysfs_remove_files(fs_info->discard_debug_kobj,
1012 discard_debug_attrs);
1013 kobject_del(fs_info->discard_debug_kobj);
1014 kobject_put(fs_info->discard_debug_kobj);
1016 if (fs_info->debug_kobj) {
1017 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1018 kobject_del(fs_info->debug_kobj);
1019 kobject_put(fs_info->debug_kobj);
1022 addrm_unknown_feature_attrs(fs_info, false);
1023 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1024 sysfs_remove_files(fsid_kobj, btrfs_attrs);
1025 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
1028 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
1029 [FEAT_COMPAT] = "compat",
1030 [FEAT_COMPAT_RO] = "compat_ro",
1031 [FEAT_INCOMPAT] = "incompat",
1034 const char *btrfs_feature_set_name(enum btrfs_feature_set set)
1036 return btrfs_feature_set_names[set];
1039 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
1041 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
1046 str = kmalloc(bufsize, GFP_KERNEL);
1050 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1053 if (!(flags & (1ULL << i)))
1056 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
1057 len += scnprintf(str + len, bufsize - len, "%s%s",
1058 len ? "," : "", name);
1064 static void init_feature_attrs(void)
1066 struct btrfs_feature_attr *fa;
1069 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
1070 ARRAY_SIZE(btrfs_feature_attrs));
1071 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
1072 ARRAY_SIZE(btrfs_feature_attrs[0]));
1074 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1075 memset(btrfs_unknown_feature_names, 0,
1076 sizeof(btrfs_unknown_feature_names));
1078 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1079 struct btrfs_feature_attr *sfa;
1080 struct attribute *a = btrfs_supported_feature_attrs[i];
1082 sfa = attr_to_btrfs_feature_attr(a);
1083 bit = ilog2(sfa->feature_bit);
1084 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1086 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1089 for (set = 0; set < FEAT_MAX; set++) {
1090 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1091 char *name = btrfs_unknown_feature_names[set][i];
1092 fa = &btrfs_feature_attrs[set][i];
1094 if (fa->kobj_attr.attr.name)
1097 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1098 btrfs_feature_set_names[set], i);
1100 fa->kobj_attr.attr.name = name;
1101 fa->kobj_attr.attr.mode = S_IRUGO;
1102 fa->feature_set = set;
1103 fa->feature_bit = 1ULL << i;
1109 * Create a sysfs entry for a given block group type at path
1110 * /sys/fs/btrfs/UUID/allocation/data/TYPE
1112 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1114 struct btrfs_fs_info *fs_info = cache->fs_info;
1115 struct btrfs_space_info *space_info = cache->space_info;
1116 struct raid_kobject *rkobj;
1117 const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1118 unsigned int nofs_flag;
1122 * Setup a NOFS context because kobject_add(), deep in its call chain,
1123 * does GFP_KERNEL allocations, and we are often called in a context
1124 * where if reclaim is triggered we can deadlock (we are either holding
1125 * a transaction handle or some lock required for a transaction
1128 nofs_flag = memalloc_nofs_save();
1130 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1132 memalloc_nofs_restore(nofs_flag);
1133 btrfs_warn(cache->fs_info,
1134 "couldn't alloc memory for raid level kobject");
1138 rkobj->flags = cache->flags;
1139 kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1140 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1141 btrfs_bg_type_to_raid_name(rkobj->flags));
1142 memalloc_nofs_restore(nofs_flag);
1144 kobject_put(&rkobj->kobj);
1146 "failed to add kobject for block cache, ignoring");
1150 space_info->block_group_kobjs[index] = &rkobj->kobj;
1154 * Remove sysfs directories for all block group types of a given space info and
1155 * the space info as well
1157 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1161 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1162 struct kobject *kobj;
1164 kobj = space_info->block_group_kobjs[i];
1165 space_info->block_group_kobjs[i] = NULL;
1171 kobject_del(&space_info->kobj);
1172 kobject_put(&space_info->kobj);
1175 static const char *alloc_name(u64 flags)
1178 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1180 case BTRFS_BLOCK_GROUP_METADATA:
1182 case BTRFS_BLOCK_GROUP_DATA:
1184 case BTRFS_BLOCK_GROUP_SYSTEM:
1188 return "invalid-combination";
1193 * Create a sysfs entry for a space info type at path
1194 * /sys/fs/btrfs/UUID/allocation/TYPE
1196 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1197 struct btrfs_space_info *space_info)
1201 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1202 fs_info->space_info_kobj, "%s",
1203 alloc_name(space_info->flags));
1205 kobject_put(&space_info->kobj);
1212 void btrfs_sysfs_remove_device(struct btrfs_device *device)
1214 struct hd_struct *disk;
1215 struct kobject *disk_kobj;
1216 struct kobject *devices_kobj;
1219 * Seed fs_devices devices_kobj aren't used, fetch kobject from the
1220 * fs_info::fs_devices.
1222 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1223 ASSERT(devices_kobj);
1226 disk = device->bdev->bd_part;
1227 disk_kobj = &part_to_dev(disk)->kobj;
1228 sysfs_remove_link(devices_kobj, disk_kobj->name);
1231 if (device->devid_kobj.state_initialized) {
1232 kobject_del(&device->devid_kobj);
1233 kobject_put(&device->devid_kobj);
1234 wait_for_completion(&device->kobj_unregister);
1238 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1239 struct kobj_attribute *a,
1243 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1246 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1248 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1250 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1252 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1253 struct kobj_attribute *a, char *buf)
1256 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1259 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1261 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1263 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1265 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1266 struct kobj_attribute *a,
1270 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1273 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1275 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1277 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1279 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1280 struct kobj_attribute *a, char *buf)
1283 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1286 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1288 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1290 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1292 static struct attribute *devid_attrs[] = {
1293 BTRFS_ATTR_PTR(devid, in_fs_metadata),
1294 BTRFS_ATTR_PTR(devid, missing),
1295 BTRFS_ATTR_PTR(devid, replace_target),
1296 BTRFS_ATTR_PTR(devid, writeable),
1299 ATTRIBUTE_GROUPS(devid);
1301 static void btrfs_release_devid_kobj(struct kobject *kobj)
1303 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1306 memset(&device->devid_kobj, 0, sizeof(struct kobject));
1307 complete(&device->kobj_unregister);
1310 static struct kobj_type devid_ktype = {
1311 .sysfs_ops = &kobj_sysfs_ops,
1312 .default_groups = devid_groups,
1313 .release = btrfs_release_devid_kobj,
1316 int btrfs_sysfs_add_device(struct btrfs_device *device)
1319 unsigned int nofs_flag;
1320 struct kobject *devices_kobj;
1321 struct kobject *devinfo_kobj;
1324 * Make sure we use the fs_info::fs_devices to fetch the kobjects even
1325 * for the seed fs_devices
1327 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1328 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
1329 ASSERT(devices_kobj);
1330 ASSERT(devinfo_kobj);
1332 nofs_flag = memalloc_nofs_save();
1335 struct hd_struct *disk;
1336 struct kobject *disk_kobj;
1338 disk = device->bdev->bd_part;
1339 disk_kobj = &part_to_dev(disk)->kobj;
1341 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
1343 btrfs_warn(device->fs_info,
1344 "creating sysfs device link for devid %llu failed: %d",
1345 device->devid, ret);
1350 init_completion(&device->kobj_unregister);
1351 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
1352 devinfo_kobj, "%llu", device->devid);
1354 kobject_put(&device->devid_kobj);
1355 btrfs_warn(device->fs_info,
1356 "devinfo init for devid %llu failed: %d",
1357 device->devid, ret);
1361 memalloc_nofs_restore(nofs_flag);
1365 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
1368 struct btrfs_device *device;
1369 struct btrfs_fs_devices *seed;
1371 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1372 ret = btrfs_sysfs_add_device(device);
1377 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1378 list_for_each_entry(device, &seed->devices, dev_list) {
1379 ret = btrfs_sysfs_add_device(device);
1388 btrfs_sysfs_remove_fs_devices(fs_devices);
1392 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1396 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1398 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1399 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1400 &disk_to_dev(bdev->bd_disk)->kobj);
1403 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
1406 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1409 * Sprouting changes fsid of the mounted filesystem, rename the fsid
1412 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
1413 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1414 btrfs_warn(fs_devices->fs_info,
1415 "sysfs: failed to create fsid for sprout");
1418 void btrfs_sysfs_update_devid(struct btrfs_device *device)
1422 snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1424 if (kobject_rename(&device->devid_kobj, tmp))
1425 btrfs_warn(device->fs_devices->fs_info,
1426 "sysfs: failed to update devid for %llu",
1430 /* /sys/fs/btrfs/ entry */
1431 static struct kset *btrfs_kset;
1435 * /sys/fs/btrfs/UUID
1437 * Can be called by the device discovery thread.
1439 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1443 init_completion(&fs_devs->kobj_unregister);
1444 fs_devs->fsid_kobj.kset = btrfs_kset;
1445 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1446 "%pU", fs_devs->fsid);
1448 kobject_put(&fs_devs->fsid_kobj);
1452 fs_devs->devices_kobj = kobject_create_and_add("devices",
1453 &fs_devs->fsid_kobj);
1454 if (!fs_devs->devices_kobj) {
1455 btrfs_err(fs_devs->fs_info,
1456 "failed to init sysfs device interface");
1457 btrfs_sysfs_remove_fsid(fs_devs);
1461 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1462 &fs_devs->fsid_kobj);
1463 if (!fs_devs->devinfo_kobj) {
1464 btrfs_err(fs_devs->fs_info,
1465 "failed to init sysfs devinfo kobject");
1466 btrfs_sysfs_remove_fsid(fs_devs);
1473 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1476 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
1477 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
1479 error = btrfs_sysfs_add_fs_devices(fs_devs);
1483 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
1485 btrfs_sysfs_remove_fs_devices(fs_devs);
1489 error = sysfs_create_group(fsid_kobj,
1490 &btrfs_feature_attr_group);
1494 #ifdef CONFIG_BTRFS_DEBUG
1495 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
1496 if (!fs_info->debug_kobj) {
1501 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1505 /* Discard directory */
1506 fs_info->discard_debug_kobj = kobject_create_and_add("discard",
1507 fs_info->debug_kobj);
1508 if (!fs_info->discard_debug_kobj) {
1513 error = sysfs_create_files(fs_info->discard_debug_kobj,
1514 discard_debug_attrs);
1519 error = addrm_unknown_feature_attrs(fs_info, true);
1523 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
1527 fs_info->space_info_kobj = kobject_create_and_add("allocation",
1529 if (!fs_info->space_info_kobj) {
1534 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
1540 btrfs_sysfs_remove_mounted(fs_info);
1544 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
1546 return to_fs_info(kobj->parent->parent);
1549 #define QGROUP_ATTR(_member, _show_name) \
1550 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
1551 struct kobj_attribute *a, \
1554 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1555 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1556 struct btrfs_qgroup, kobj); \
1557 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
1559 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
1561 #define QGROUP_RSV_ATTR(_name, _type) \
1562 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
1563 struct kobj_attribute *a, \
1566 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1567 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1568 struct btrfs_qgroup, kobj); \
1569 return btrfs_show_u64(&qgroup->rsv.values[_type], \
1570 &fs_info->qgroup_lock, buf); \
1572 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
1574 QGROUP_ATTR(rfer, referenced);
1575 QGROUP_ATTR(excl, exclusive);
1576 QGROUP_ATTR(max_rfer, max_referenced);
1577 QGROUP_ATTR(max_excl, max_exclusive);
1578 QGROUP_ATTR(lim_flags, limit_flags);
1579 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
1580 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
1581 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
1583 static struct attribute *qgroup_attrs[] = {
1584 BTRFS_ATTR_PTR(qgroup, referenced),
1585 BTRFS_ATTR_PTR(qgroup, exclusive),
1586 BTRFS_ATTR_PTR(qgroup, max_referenced),
1587 BTRFS_ATTR_PTR(qgroup, max_exclusive),
1588 BTRFS_ATTR_PTR(qgroup, limit_flags),
1589 BTRFS_ATTR_PTR(qgroup, rsv_data),
1590 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
1591 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
1594 ATTRIBUTE_GROUPS(qgroup);
1596 static void qgroup_release(struct kobject *kobj)
1598 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
1600 memset(&qgroup->kobj, 0, sizeof(*kobj));
1603 static struct kobj_type qgroup_ktype = {
1604 .sysfs_ops = &kobj_sysfs_ops,
1605 .release = qgroup_release,
1606 .default_groups = qgroup_groups,
1609 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
1610 struct btrfs_qgroup *qgroup)
1612 struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
1615 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1617 if (qgroup->kobj.state_initialized)
1622 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
1623 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
1624 btrfs_qgroup_subvolid(qgroup->qgroupid));
1626 kobject_put(&qgroup->kobj);
1631 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
1633 struct btrfs_qgroup *qgroup;
1634 struct btrfs_qgroup *next;
1636 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1639 rbtree_postorder_for_each_entry_safe(qgroup, next,
1640 &fs_info->qgroup_tree, node)
1641 btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
1642 if (fs_info->qgroups_kobj) {
1643 kobject_del(fs_info->qgroups_kobj);
1644 kobject_put(fs_info->qgroups_kobj);
1645 fs_info->qgroups_kobj = NULL;
1649 /* Called when qgroups get initialized, thus there is no need for locking */
1650 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
1652 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1653 struct btrfs_qgroup *qgroup;
1654 struct btrfs_qgroup *next;
1657 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1661 if (fs_info->qgroups_kobj)
1664 fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj);
1665 if (!fs_info->qgroups_kobj) {
1669 rbtree_postorder_for_each_entry_safe(qgroup, next,
1670 &fs_info->qgroup_tree, node) {
1671 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
1678 btrfs_sysfs_del_qgroups(fs_info);
1682 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
1683 struct btrfs_qgroup *qgroup)
1685 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1688 if (qgroup->kobj.state_initialized) {
1689 kobject_del(&qgroup->kobj);
1690 kobject_put(&qgroup->kobj);
1695 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
1696 * values in superblock. Call after any changes to incompat/compat_ro flags
1698 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
1699 u64 bit, enum btrfs_feature_set set)
1701 struct btrfs_fs_devices *fs_devs;
1702 struct kobject *fsid_kobj;
1703 u64 __maybe_unused features;
1704 int __maybe_unused ret;
1710 * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
1711 * safe when called from some contexts (eg. balance)
1713 features = get_features(fs_info, set);
1714 ASSERT(bit & supported_feature_masks[set]);
1716 fs_devs = fs_info->fs_devices;
1717 fsid_kobj = &fs_devs->fsid_kobj;
1719 if (!fsid_kobj->state_initialized)
1723 * FIXME: this is too heavy to update just one value, ideally we'd like
1724 * to use sysfs_update_group but some refactoring is needed first.
1726 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1727 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
1730 int __init btrfs_init_sysfs(void)
1734 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
1738 init_feature_attrs();
1739 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1742 ret = sysfs_merge_group(&btrfs_kset->kobj,
1743 &btrfs_static_feature_attr_group);
1745 goto out_remove_group;
1747 #ifdef CONFIG_BTRFS_DEBUG
1748 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1756 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1758 kset_unregister(btrfs_kset);
1763 void __cold btrfs_exit_sysfs(void)
1765 sysfs_unmerge_group(&btrfs_kset->kobj,
1766 &btrfs_static_feature_attr_group);
1767 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1768 #ifdef CONFIG_BTRFS_DEBUG
1769 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1771 kset_unregister(btrfs_kset);