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);
266 /* Remove once support for zoned allocation is feature complete */
267 #ifdef CONFIG_BTRFS_DEBUG
268 BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);
271 static struct attribute *btrfs_supported_feature_attrs[] = {
272 BTRFS_FEAT_ATTR_PTR(mixed_backref),
273 BTRFS_FEAT_ATTR_PTR(default_subvol),
274 BTRFS_FEAT_ATTR_PTR(mixed_groups),
275 BTRFS_FEAT_ATTR_PTR(compress_lzo),
276 BTRFS_FEAT_ATTR_PTR(compress_zstd),
277 BTRFS_FEAT_ATTR_PTR(big_metadata),
278 BTRFS_FEAT_ATTR_PTR(extended_iref),
279 BTRFS_FEAT_ATTR_PTR(raid56),
280 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
281 BTRFS_FEAT_ATTR_PTR(no_holes),
282 BTRFS_FEAT_ATTR_PTR(metadata_uuid),
283 BTRFS_FEAT_ATTR_PTR(free_space_tree),
284 BTRFS_FEAT_ATTR_PTR(raid1c34),
285 #ifdef CONFIG_BTRFS_DEBUG
286 BTRFS_FEAT_ATTR_PTR(zoned),
292 * Features which depend on feature bits and may differ between each fs.
294 * /sys/fs/btrfs/features lists all available features of this kernel while
295 * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
296 * can be changed online.
298 static const struct attribute_group btrfs_feature_attr_group = {
300 .is_visible = btrfs_feature_visible,
301 .attrs = btrfs_supported_feature_attrs,
304 static ssize_t rmdir_subvol_show(struct kobject *kobj,
305 struct kobj_attribute *ka, char *buf)
307 return scnprintf(buf, PAGE_SIZE, "0\n");
309 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
311 static ssize_t supported_checksums_show(struct kobject *kobj,
312 struct kobj_attribute *a, char *buf)
317 for (i = 0; i < btrfs_get_num_csums(); i++) {
319 * This "trick" only works as long as 'enum btrfs_csum_type' has
322 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
323 (i == 0 ? "" : " "), btrfs_super_csum_name(i));
327 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
330 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
332 static ssize_t send_stream_version_show(struct kobject *kobj,
333 struct kobj_attribute *ka, char *buf)
335 return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION);
337 BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);
339 static const char *rescue_opts[] = {
347 static ssize_t supported_rescue_options_show(struct kobject *kobj,
348 struct kobj_attribute *a,
354 for (i = 0; i < ARRAY_SIZE(rescue_opts); i++)
355 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
356 (i ? " " : ""), rescue_opts[i]);
357 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
360 BTRFS_ATTR(static_feature, supported_rescue_options,
361 supported_rescue_options_show);
363 static struct attribute *btrfs_supported_static_feature_attrs[] = {
364 BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
365 BTRFS_ATTR_PTR(static_feature, supported_checksums),
366 BTRFS_ATTR_PTR(static_feature, send_stream_version),
367 BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
372 * Features which only depend on kernel version.
374 * These are listed in /sys/fs/btrfs/features along with
375 * btrfs_feature_attr_group
377 static const struct attribute_group btrfs_static_feature_attr_group = {
379 .attrs = btrfs_supported_static_feature_attrs,
382 #ifdef CONFIG_BTRFS_DEBUG
385 * Discard statistics and tunables
387 #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent)
389 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
390 struct kobj_attribute *a,
393 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
395 return scnprintf(buf, PAGE_SIZE, "%lld\n",
396 atomic64_read(&fs_info->discard_ctl.discardable_bytes));
398 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
400 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
401 struct kobj_attribute *a,
404 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
406 return scnprintf(buf, PAGE_SIZE, "%d\n",
407 atomic_read(&fs_info->discard_ctl.discardable_extents));
409 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
411 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
412 struct kobj_attribute *a,
415 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
417 return scnprintf(buf, PAGE_SIZE, "%lld\n",
418 fs_info->discard_ctl.discard_bitmap_bytes);
420 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
422 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
423 struct kobj_attribute *a,
426 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
428 return scnprintf(buf, PAGE_SIZE, "%lld\n",
429 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
431 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
433 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
434 struct kobj_attribute *a,
437 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
439 return scnprintf(buf, PAGE_SIZE, "%lld\n",
440 fs_info->discard_ctl.discard_extent_bytes);
442 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
444 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
445 struct kobj_attribute *a,
448 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
450 return scnprintf(buf, PAGE_SIZE, "%u\n",
451 READ_ONCE(fs_info->discard_ctl.iops_limit));
454 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
455 struct kobj_attribute *a,
456 const char *buf, size_t len)
458 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
459 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
463 ret = kstrtou32(buf, 10, &iops_limit);
467 WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
468 btrfs_discard_calc_delay(discard_ctl);
469 btrfs_discard_schedule_work(discard_ctl, true);
472 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
473 btrfs_discard_iops_limit_store);
475 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
476 struct kobj_attribute *a,
479 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
481 return scnprintf(buf, PAGE_SIZE, "%u\n",
482 READ_ONCE(fs_info->discard_ctl.kbps_limit));
485 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
486 struct kobj_attribute *a,
487 const char *buf, size_t len)
489 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
490 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
494 ret = kstrtou32(buf, 10, &kbps_limit);
498 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
499 btrfs_discard_schedule_work(discard_ctl, true);
502 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
503 btrfs_discard_kbps_limit_store);
505 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
506 struct kobj_attribute *a,
509 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
511 return scnprintf(buf, PAGE_SIZE, "%llu\n",
512 READ_ONCE(fs_info->discard_ctl.max_discard_size));
515 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
516 struct kobj_attribute *a,
517 const char *buf, size_t len)
519 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
520 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
521 u64 max_discard_size;
524 ret = kstrtou64(buf, 10, &max_discard_size);
528 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
532 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
533 btrfs_discard_max_discard_size_store);
535 static const struct attribute *discard_debug_attrs[] = {
536 BTRFS_ATTR_PTR(discard, discardable_bytes),
537 BTRFS_ATTR_PTR(discard, discardable_extents),
538 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
539 BTRFS_ATTR_PTR(discard, discard_bytes_saved),
540 BTRFS_ATTR_PTR(discard, discard_extent_bytes),
541 BTRFS_ATTR_PTR(discard, iops_limit),
542 BTRFS_ATTR_PTR(discard, kbps_limit),
543 BTRFS_ATTR_PTR(discard, max_discard_size),
548 * Runtime debugging exported via sysfs
550 * /sys/fs/btrfs/debug - applies to module or all filesystems
551 * /sys/fs/btrfs/UUID - applies only to the given filesystem
553 static const struct attribute *btrfs_debug_mount_attrs[] = {
557 static struct attribute *btrfs_debug_feature_attrs[] = {
561 static const struct attribute_group btrfs_debug_feature_attr_group = {
563 .attrs = btrfs_debug_feature_attrs,
568 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
576 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
579 static ssize_t global_rsv_size_show(struct kobject *kobj,
580 struct kobj_attribute *ka, char *buf)
582 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
583 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
584 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
586 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
588 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
589 struct kobj_attribute *a, char *buf)
591 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
592 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
593 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
595 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
597 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
598 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
600 static ssize_t raid_bytes_show(struct kobject *kobj,
601 struct kobj_attribute *attr, char *buf);
602 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
603 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
605 static ssize_t raid_bytes_show(struct kobject *kobj,
606 struct kobj_attribute *attr, char *buf)
609 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
610 struct btrfs_block_group *block_group;
611 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
614 down_read(&sinfo->groups_sem);
615 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
616 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
617 val += block_group->length;
619 val += block_group->used;
621 up_read(&sinfo->groups_sem);
622 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
625 static struct attribute *raid_attrs[] = {
626 BTRFS_ATTR_PTR(raid, total_bytes),
627 BTRFS_ATTR_PTR(raid, used_bytes),
630 ATTRIBUTE_GROUPS(raid);
632 static void release_raid_kobj(struct kobject *kobj)
634 kfree(to_raid_kobj(kobj));
637 static struct kobj_type btrfs_raid_ktype = {
638 .sysfs_ops = &kobj_sysfs_ops,
639 .release = release_raid_kobj,
640 .default_groups = raid_groups,
643 #define SPACE_INFO_ATTR(field) \
644 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
645 struct kobj_attribute *a, \
648 struct btrfs_space_info *sinfo = to_space_info(kobj); \
649 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
651 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
653 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
654 struct kobj_attribute *a,
657 struct btrfs_space_info *sinfo = to_space_info(kobj);
658 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
659 return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
662 SPACE_INFO_ATTR(flags);
663 SPACE_INFO_ATTR(total_bytes);
664 SPACE_INFO_ATTR(bytes_used);
665 SPACE_INFO_ATTR(bytes_pinned);
666 SPACE_INFO_ATTR(bytes_reserved);
667 SPACE_INFO_ATTR(bytes_may_use);
668 SPACE_INFO_ATTR(bytes_readonly);
669 SPACE_INFO_ATTR(bytes_zone_unusable);
670 SPACE_INFO_ATTR(disk_used);
671 SPACE_INFO_ATTR(disk_total);
672 BTRFS_ATTR(space_info, total_bytes_pinned,
673 btrfs_space_info_show_total_bytes_pinned);
675 static struct attribute *space_info_attrs[] = {
676 BTRFS_ATTR_PTR(space_info, flags),
677 BTRFS_ATTR_PTR(space_info, total_bytes),
678 BTRFS_ATTR_PTR(space_info, bytes_used),
679 BTRFS_ATTR_PTR(space_info, bytes_pinned),
680 BTRFS_ATTR_PTR(space_info, bytes_reserved),
681 BTRFS_ATTR_PTR(space_info, bytes_may_use),
682 BTRFS_ATTR_PTR(space_info, bytes_readonly),
683 BTRFS_ATTR_PTR(space_info, bytes_zone_unusable),
684 BTRFS_ATTR_PTR(space_info, disk_used),
685 BTRFS_ATTR_PTR(space_info, disk_total),
686 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
689 ATTRIBUTE_GROUPS(space_info);
691 static void space_info_release(struct kobject *kobj)
693 struct btrfs_space_info *sinfo = to_space_info(kobj);
694 percpu_counter_destroy(&sinfo->total_bytes_pinned);
698 static struct kobj_type space_info_ktype = {
699 .sysfs_ops = &kobj_sysfs_ops,
700 .release = space_info_release,
701 .default_groups = space_info_groups,
704 static const struct attribute *allocation_attrs[] = {
705 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
706 BTRFS_ATTR_PTR(allocation, global_rsv_size),
710 static ssize_t btrfs_label_show(struct kobject *kobj,
711 struct kobj_attribute *a, char *buf)
713 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
714 char *label = fs_info->super_copy->label;
717 spin_lock(&fs_info->super_lock);
718 ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
719 spin_unlock(&fs_info->super_lock);
724 static ssize_t btrfs_label_store(struct kobject *kobj,
725 struct kobj_attribute *a,
726 const char *buf, size_t len)
728 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
734 if (sb_rdonly(fs_info->sb))
738 * p_len is the len until the first occurrence of either
741 p_len = strcspn(buf, "\n");
743 if (p_len >= BTRFS_LABEL_SIZE)
746 spin_lock(&fs_info->super_lock);
747 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
748 memcpy(fs_info->super_copy->label, buf, p_len);
749 spin_unlock(&fs_info->super_lock);
752 * We don't want to do full transaction commit from inside sysfs
754 btrfs_set_pending(fs_info, COMMIT);
755 wake_up_process(fs_info->transaction_kthread);
759 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
761 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
762 struct kobj_attribute *a, char *buf)
764 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
766 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
769 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
771 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
772 struct kobj_attribute *a, char *buf)
774 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
776 return scnprintf(buf, PAGE_SIZE, "%u\n",
777 fs_info->super_copy->sectorsize);
780 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
782 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
783 struct kobj_attribute *a, char *buf)
785 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
787 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
790 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
792 static ssize_t quota_override_show(struct kobject *kobj,
793 struct kobj_attribute *a, char *buf)
795 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
798 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
799 return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
802 static ssize_t quota_override_store(struct kobject *kobj,
803 struct kobj_attribute *a,
804 const char *buf, size_t len)
806 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
813 if (!capable(CAP_SYS_RESOURCE))
816 err = kstrtoul(buf, 10, &knob);
823 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
825 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
830 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
832 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
833 struct kobj_attribute *a, char *buf)
835 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
837 return scnprintf(buf, PAGE_SIZE, "%pU\n",
838 fs_info->fs_devices->metadata_uuid);
841 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
843 static ssize_t btrfs_checksum_show(struct kobject *kobj,
844 struct kobj_attribute *a, char *buf)
846 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
847 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
849 return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
850 btrfs_super_csum_name(csum_type),
851 crypto_shash_driver_name(fs_info->csum_shash));
854 BTRFS_ATTR(, checksum, btrfs_checksum_show);
856 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
857 struct kobj_attribute *a, char *buf)
859 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
862 switch (READ_ONCE(fs_info->exclusive_operation)) {
863 case BTRFS_EXCLOP_NONE:
866 case BTRFS_EXCLOP_BALANCE:
869 case BTRFS_EXCLOP_DEV_ADD:
870 str = "device add\n";
872 case BTRFS_EXCLOP_DEV_REMOVE:
873 str = "device remove\n";
875 case BTRFS_EXCLOP_DEV_REPLACE:
876 str = "device replace\n";
878 case BTRFS_EXCLOP_RESIZE:
881 case BTRFS_EXCLOP_SWAP_ACTIVATE:
882 str = "swap activate\n";
888 return scnprintf(buf, PAGE_SIZE, "%s", str);
890 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
892 static ssize_t btrfs_generation_show(struct kobject *kobj,
893 struct kobj_attribute *a, char *buf)
895 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
897 return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation);
899 BTRFS_ATTR(, generation, btrfs_generation_show);
902 * Look for an exact string @string in @buffer with possible leading or
903 * trailing whitespace
905 static bool strmatch(const char *buffer, const char *string)
907 const size_t len = strlen(string);
909 /* Skip leading whitespace */
910 buffer = skip_spaces(buffer);
912 /* Match entire string, check if the rest is whitespace or empty */
913 if (strncmp(string, buffer, len) == 0 &&
914 strlen(skip_spaces(buffer + len)) == 0)
920 static const char * const btrfs_read_policy_name[] = { "pid" };
922 static ssize_t btrfs_read_policy_show(struct kobject *kobj,
923 struct kobj_attribute *a, char *buf)
925 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
929 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
930 if (fs_devices->read_policy == i)
931 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s[%s]",
932 (ret == 0 ? "" : " "),
933 btrfs_read_policy_name[i]);
935 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
936 (ret == 0 ? "" : " "),
937 btrfs_read_policy_name[i]);
940 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
945 static ssize_t btrfs_read_policy_store(struct kobject *kobj,
946 struct kobj_attribute *a,
947 const char *buf, size_t len)
949 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
952 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
953 if (strmatch(buf, btrfs_read_policy_name[i])) {
954 if (i != fs_devices->read_policy) {
955 fs_devices->read_policy = i;
956 btrfs_info(fs_devices->fs_info,
957 "read policy set to '%s'",
958 btrfs_read_policy_name[i]);
966 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store);
968 static const struct attribute *btrfs_attrs[] = {
969 BTRFS_ATTR_PTR(, label),
970 BTRFS_ATTR_PTR(, nodesize),
971 BTRFS_ATTR_PTR(, sectorsize),
972 BTRFS_ATTR_PTR(, clone_alignment),
973 BTRFS_ATTR_PTR(, quota_override),
974 BTRFS_ATTR_PTR(, metadata_uuid),
975 BTRFS_ATTR_PTR(, checksum),
976 BTRFS_ATTR_PTR(, exclusive_operation),
977 BTRFS_ATTR_PTR(, generation),
978 BTRFS_ATTR_PTR(, read_policy),
982 static void btrfs_release_fsid_kobj(struct kobject *kobj)
984 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
986 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
987 complete(&fs_devs->kobj_unregister);
990 static struct kobj_type btrfs_ktype = {
991 .sysfs_ops = &kobj_sysfs_ops,
992 .release = btrfs_release_fsid_kobj,
995 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
997 if (kobj->ktype != &btrfs_ktype)
999 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
1002 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
1004 if (kobj->ktype != &btrfs_ktype)
1006 return to_fs_devs(kobj)->fs_info;
1009 #define NUM_FEATURE_BITS 64
1010 #define BTRFS_FEATURE_NAME_MAX 13
1011 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
1012 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
1014 static const u64 supported_feature_masks[FEAT_MAX] = {
1015 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
1016 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
1017 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
1020 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
1024 for (set = 0; set < FEAT_MAX; set++) {
1026 struct attribute *attrs[2];
1027 struct attribute_group agroup = {
1031 u64 features = get_features(fs_info, set);
1032 features &= ~supported_feature_masks[set];
1038 for (i = 0; i < NUM_FEATURE_BITS; i++) {
1039 struct btrfs_feature_attr *fa;
1041 if (!(features & (1ULL << i)))
1044 fa = &btrfs_feature_attrs[set][i];
1045 attrs[0] = &fa->kobj_attr.attr;
1048 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
1053 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
1061 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1063 if (fs_devs->devinfo_kobj) {
1064 kobject_del(fs_devs->devinfo_kobj);
1065 kobject_put(fs_devs->devinfo_kobj);
1066 fs_devs->devinfo_kobj = NULL;
1069 if (fs_devs->devices_kobj) {
1070 kobject_del(fs_devs->devices_kobj);
1071 kobject_put(fs_devs->devices_kobj);
1072 fs_devs->devices_kobj = NULL;
1075 if (fs_devs->fsid_kobj.state_initialized) {
1076 kobject_del(&fs_devs->fsid_kobj);
1077 kobject_put(&fs_devs->fsid_kobj);
1078 wait_for_completion(&fs_devs->kobj_unregister);
1082 /* when fs_devs is NULL it will remove all fsid kobject */
1083 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1085 struct list_head *fs_uuids = btrfs_get_fs_uuids();
1088 __btrfs_sysfs_remove_fsid(fs_devs);
1092 list_for_each_entry(fs_devs, fs_uuids, fs_list) {
1093 __btrfs_sysfs_remove_fsid(fs_devs);
1097 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
1099 struct btrfs_device *device;
1100 struct btrfs_fs_devices *seed;
1102 list_for_each_entry(device, &fs_devices->devices, dev_list)
1103 btrfs_sysfs_remove_device(device);
1105 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1106 list_for_each_entry(device, &seed->devices, dev_list)
1107 btrfs_sysfs_remove_device(device);
1111 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
1113 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1115 sysfs_remove_link(fsid_kobj, "bdi");
1117 if (fs_info->space_info_kobj) {
1118 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
1119 kobject_del(fs_info->space_info_kobj);
1120 kobject_put(fs_info->space_info_kobj);
1122 #ifdef CONFIG_BTRFS_DEBUG
1123 if (fs_info->discard_debug_kobj) {
1124 sysfs_remove_files(fs_info->discard_debug_kobj,
1125 discard_debug_attrs);
1126 kobject_del(fs_info->discard_debug_kobj);
1127 kobject_put(fs_info->discard_debug_kobj);
1129 if (fs_info->debug_kobj) {
1130 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1131 kobject_del(fs_info->debug_kobj);
1132 kobject_put(fs_info->debug_kobj);
1135 addrm_unknown_feature_attrs(fs_info, false);
1136 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1137 sysfs_remove_files(fsid_kobj, btrfs_attrs);
1138 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
1141 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
1142 [FEAT_COMPAT] = "compat",
1143 [FEAT_COMPAT_RO] = "compat_ro",
1144 [FEAT_INCOMPAT] = "incompat",
1147 const char *btrfs_feature_set_name(enum btrfs_feature_set set)
1149 return btrfs_feature_set_names[set];
1152 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
1154 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
1159 str = kmalloc(bufsize, GFP_KERNEL);
1163 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1166 if (!(flags & (1ULL << i)))
1169 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
1170 len += scnprintf(str + len, bufsize - len, "%s%s",
1171 len ? "," : "", name);
1177 static void init_feature_attrs(void)
1179 struct btrfs_feature_attr *fa;
1182 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
1183 ARRAY_SIZE(btrfs_feature_attrs));
1184 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
1185 ARRAY_SIZE(btrfs_feature_attrs[0]));
1187 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1188 memset(btrfs_unknown_feature_names, 0,
1189 sizeof(btrfs_unknown_feature_names));
1191 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1192 struct btrfs_feature_attr *sfa;
1193 struct attribute *a = btrfs_supported_feature_attrs[i];
1195 sfa = attr_to_btrfs_feature_attr(a);
1196 bit = ilog2(sfa->feature_bit);
1197 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1199 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1202 for (set = 0; set < FEAT_MAX; set++) {
1203 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1204 char *name = btrfs_unknown_feature_names[set][i];
1205 fa = &btrfs_feature_attrs[set][i];
1207 if (fa->kobj_attr.attr.name)
1210 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1211 btrfs_feature_set_names[set], i);
1213 fa->kobj_attr.attr.name = name;
1214 fa->kobj_attr.attr.mode = S_IRUGO;
1215 fa->feature_set = set;
1216 fa->feature_bit = 1ULL << i;
1222 * Create a sysfs entry for a given block group type at path
1223 * /sys/fs/btrfs/UUID/allocation/data/TYPE
1225 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1227 struct btrfs_fs_info *fs_info = cache->fs_info;
1228 struct btrfs_space_info *space_info = cache->space_info;
1229 struct raid_kobject *rkobj;
1230 const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1231 unsigned int nofs_flag;
1235 * Setup a NOFS context because kobject_add(), deep in its call chain,
1236 * does GFP_KERNEL allocations, and we are often called in a context
1237 * where if reclaim is triggered we can deadlock (we are either holding
1238 * a transaction handle or some lock required for a transaction
1241 nofs_flag = memalloc_nofs_save();
1243 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1245 memalloc_nofs_restore(nofs_flag);
1246 btrfs_warn(cache->fs_info,
1247 "couldn't alloc memory for raid level kobject");
1251 rkobj->flags = cache->flags;
1252 kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1255 * We call this either on mount, or if we've created a block group for a
1256 * new index type while running (i.e. when restriping). The running
1257 * case is tricky because we could race with other threads, so we need
1258 * to have this check to make sure we didn't already init the kobject.
1260 * We don't have to protect on the free side because it only happens on
1263 spin_lock(&space_info->lock);
1264 if (space_info->block_group_kobjs[index]) {
1265 spin_unlock(&space_info->lock);
1266 kobject_put(&rkobj->kobj);
1269 space_info->block_group_kobjs[index] = &rkobj->kobj;
1271 spin_unlock(&space_info->lock);
1273 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1274 btrfs_bg_type_to_raid_name(rkobj->flags));
1275 memalloc_nofs_restore(nofs_flag);
1277 spin_lock(&space_info->lock);
1278 space_info->block_group_kobjs[index] = NULL;
1279 spin_unlock(&space_info->lock);
1280 kobject_put(&rkobj->kobj);
1282 "failed to add kobject for block cache, ignoring");
1288 * Remove sysfs directories for all block group types of a given space info and
1289 * the space info as well
1291 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1295 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1296 struct kobject *kobj;
1298 kobj = space_info->block_group_kobjs[i];
1299 space_info->block_group_kobjs[i] = NULL;
1305 kobject_del(&space_info->kobj);
1306 kobject_put(&space_info->kobj);
1309 static const char *alloc_name(u64 flags)
1312 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1314 case BTRFS_BLOCK_GROUP_METADATA:
1316 case BTRFS_BLOCK_GROUP_DATA:
1318 case BTRFS_BLOCK_GROUP_SYSTEM:
1322 return "invalid-combination";
1327 * Create a sysfs entry for a space info type at path
1328 * /sys/fs/btrfs/UUID/allocation/TYPE
1330 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1331 struct btrfs_space_info *space_info)
1335 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1336 fs_info->space_info_kobj, "%s",
1337 alloc_name(space_info->flags));
1339 kobject_put(&space_info->kobj);
1346 void btrfs_sysfs_remove_device(struct btrfs_device *device)
1348 struct kobject *devices_kobj;
1351 * Seed fs_devices devices_kobj aren't used, fetch kobject from the
1352 * fs_info::fs_devices.
1354 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1355 ASSERT(devices_kobj);
1358 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name);
1360 if (device->devid_kobj.state_initialized) {
1361 kobject_del(&device->devid_kobj);
1362 kobject_put(&device->devid_kobj);
1363 wait_for_completion(&device->kobj_unregister);
1367 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1368 struct kobj_attribute *a,
1372 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1375 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1377 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1379 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1381 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1382 struct kobj_attribute *a, char *buf)
1385 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1388 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1390 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1392 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1394 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1395 struct kobj_attribute *a,
1399 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1402 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1404 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1406 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1408 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1409 struct kobj_attribute *a, char *buf)
1412 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1415 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1417 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1419 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1421 static struct attribute *devid_attrs[] = {
1422 BTRFS_ATTR_PTR(devid, in_fs_metadata),
1423 BTRFS_ATTR_PTR(devid, missing),
1424 BTRFS_ATTR_PTR(devid, replace_target),
1425 BTRFS_ATTR_PTR(devid, writeable),
1428 ATTRIBUTE_GROUPS(devid);
1430 static void btrfs_release_devid_kobj(struct kobject *kobj)
1432 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1435 memset(&device->devid_kobj, 0, sizeof(struct kobject));
1436 complete(&device->kobj_unregister);
1439 static struct kobj_type devid_ktype = {
1440 .sysfs_ops = &kobj_sysfs_ops,
1441 .default_groups = devid_groups,
1442 .release = btrfs_release_devid_kobj,
1445 int btrfs_sysfs_add_device(struct btrfs_device *device)
1448 unsigned int nofs_flag;
1449 struct kobject *devices_kobj;
1450 struct kobject *devinfo_kobj;
1453 * Make sure we use the fs_info::fs_devices to fetch the kobjects even
1454 * for the seed fs_devices
1456 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1457 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
1458 ASSERT(devices_kobj);
1459 ASSERT(devinfo_kobj);
1461 nofs_flag = memalloc_nofs_save();
1464 struct kobject *disk_kobj = bdev_kobj(device->bdev);
1466 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
1468 btrfs_warn(device->fs_info,
1469 "creating sysfs device link for devid %llu failed: %d",
1470 device->devid, ret);
1475 init_completion(&device->kobj_unregister);
1476 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
1477 devinfo_kobj, "%llu", device->devid);
1479 kobject_put(&device->devid_kobj);
1480 btrfs_warn(device->fs_info,
1481 "devinfo init for devid %llu failed: %d",
1482 device->devid, ret);
1486 memalloc_nofs_restore(nofs_flag);
1490 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
1493 struct btrfs_device *device;
1494 struct btrfs_fs_devices *seed;
1496 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1497 ret = btrfs_sysfs_add_device(device);
1502 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1503 list_for_each_entry(device, &seed->devices, dev_list) {
1504 ret = btrfs_sysfs_add_device(device);
1513 btrfs_sysfs_remove_fs_devices(fs_devices);
1517 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1521 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1523 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1524 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1525 &disk_to_dev(bdev->bd_disk)->kobj);
1528 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
1531 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1534 * Sprouting changes fsid of the mounted filesystem, rename the fsid
1537 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
1538 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1539 btrfs_warn(fs_devices->fs_info,
1540 "sysfs: failed to create fsid for sprout");
1543 void btrfs_sysfs_update_devid(struct btrfs_device *device)
1547 snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1549 if (kobject_rename(&device->devid_kobj, tmp))
1550 btrfs_warn(device->fs_devices->fs_info,
1551 "sysfs: failed to update devid for %llu",
1555 /* /sys/fs/btrfs/ entry */
1556 static struct kset *btrfs_kset;
1560 * /sys/fs/btrfs/UUID
1562 * Can be called by the device discovery thread.
1564 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1568 init_completion(&fs_devs->kobj_unregister);
1569 fs_devs->fsid_kobj.kset = btrfs_kset;
1570 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1571 "%pU", fs_devs->fsid);
1573 kobject_put(&fs_devs->fsid_kobj);
1577 fs_devs->devices_kobj = kobject_create_and_add("devices",
1578 &fs_devs->fsid_kobj);
1579 if (!fs_devs->devices_kobj) {
1580 btrfs_err(fs_devs->fs_info,
1581 "failed to init sysfs device interface");
1582 btrfs_sysfs_remove_fsid(fs_devs);
1586 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1587 &fs_devs->fsid_kobj);
1588 if (!fs_devs->devinfo_kobj) {
1589 btrfs_err(fs_devs->fs_info,
1590 "failed to init sysfs devinfo kobject");
1591 btrfs_sysfs_remove_fsid(fs_devs);
1598 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1601 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
1602 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
1604 error = btrfs_sysfs_add_fs_devices(fs_devs);
1608 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
1610 btrfs_sysfs_remove_fs_devices(fs_devs);
1614 error = sysfs_create_group(fsid_kobj,
1615 &btrfs_feature_attr_group);
1619 #ifdef CONFIG_BTRFS_DEBUG
1620 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
1621 if (!fs_info->debug_kobj) {
1626 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1630 /* Discard directory */
1631 fs_info->discard_debug_kobj = kobject_create_and_add("discard",
1632 fs_info->debug_kobj);
1633 if (!fs_info->discard_debug_kobj) {
1638 error = sysfs_create_files(fs_info->discard_debug_kobj,
1639 discard_debug_attrs);
1644 error = addrm_unknown_feature_attrs(fs_info, true);
1648 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
1652 fs_info->space_info_kobj = kobject_create_and_add("allocation",
1654 if (!fs_info->space_info_kobj) {
1659 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
1665 btrfs_sysfs_remove_mounted(fs_info);
1669 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
1671 return to_fs_info(kobj->parent->parent);
1674 #define QGROUP_ATTR(_member, _show_name) \
1675 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
1676 struct kobj_attribute *a, \
1679 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1680 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1681 struct btrfs_qgroup, kobj); \
1682 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
1684 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
1686 #define QGROUP_RSV_ATTR(_name, _type) \
1687 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
1688 struct kobj_attribute *a, \
1691 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1692 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1693 struct btrfs_qgroup, kobj); \
1694 return btrfs_show_u64(&qgroup->rsv.values[_type], \
1695 &fs_info->qgroup_lock, buf); \
1697 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
1699 QGROUP_ATTR(rfer, referenced);
1700 QGROUP_ATTR(excl, exclusive);
1701 QGROUP_ATTR(max_rfer, max_referenced);
1702 QGROUP_ATTR(max_excl, max_exclusive);
1703 QGROUP_ATTR(lim_flags, limit_flags);
1704 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
1705 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
1706 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
1708 static struct attribute *qgroup_attrs[] = {
1709 BTRFS_ATTR_PTR(qgroup, referenced),
1710 BTRFS_ATTR_PTR(qgroup, exclusive),
1711 BTRFS_ATTR_PTR(qgroup, max_referenced),
1712 BTRFS_ATTR_PTR(qgroup, max_exclusive),
1713 BTRFS_ATTR_PTR(qgroup, limit_flags),
1714 BTRFS_ATTR_PTR(qgroup, rsv_data),
1715 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
1716 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
1719 ATTRIBUTE_GROUPS(qgroup);
1721 static void qgroup_release(struct kobject *kobj)
1723 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
1725 memset(&qgroup->kobj, 0, sizeof(*kobj));
1728 static struct kobj_type qgroup_ktype = {
1729 .sysfs_ops = &kobj_sysfs_ops,
1730 .release = qgroup_release,
1731 .default_groups = qgroup_groups,
1734 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
1735 struct btrfs_qgroup *qgroup)
1737 struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
1740 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1742 if (qgroup->kobj.state_initialized)
1747 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
1748 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
1749 btrfs_qgroup_subvolid(qgroup->qgroupid));
1751 kobject_put(&qgroup->kobj);
1756 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
1758 struct btrfs_qgroup *qgroup;
1759 struct btrfs_qgroup *next;
1761 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1764 rbtree_postorder_for_each_entry_safe(qgroup, next,
1765 &fs_info->qgroup_tree, node)
1766 btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
1767 if (fs_info->qgroups_kobj) {
1768 kobject_del(fs_info->qgroups_kobj);
1769 kobject_put(fs_info->qgroups_kobj);
1770 fs_info->qgroups_kobj = NULL;
1774 /* Called when qgroups get initialized, thus there is no need for locking */
1775 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
1777 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1778 struct btrfs_qgroup *qgroup;
1779 struct btrfs_qgroup *next;
1782 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1786 if (fs_info->qgroups_kobj)
1789 fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj);
1790 if (!fs_info->qgroups_kobj) {
1794 rbtree_postorder_for_each_entry_safe(qgroup, next,
1795 &fs_info->qgroup_tree, node) {
1796 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
1803 btrfs_sysfs_del_qgroups(fs_info);
1807 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
1808 struct btrfs_qgroup *qgroup)
1810 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1813 if (qgroup->kobj.state_initialized) {
1814 kobject_del(&qgroup->kobj);
1815 kobject_put(&qgroup->kobj);
1820 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
1821 * values in superblock. Call after any changes to incompat/compat_ro flags
1823 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
1824 u64 bit, enum btrfs_feature_set set)
1826 struct btrfs_fs_devices *fs_devs;
1827 struct kobject *fsid_kobj;
1828 u64 __maybe_unused features;
1829 int __maybe_unused ret;
1835 * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
1836 * safe when called from some contexts (eg. balance)
1838 features = get_features(fs_info, set);
1839 ASSERT(bit & supported_feature_masks[set]);
1841 fs_devs = fs_info->fs_devices;
1842 fsid_kobj = &fs_devs->fsid_kobj;
1844 if (!fsid_kobj->state_initialized)
1848 * FIXME: this is too heavy to update just one value, ideally we'd like
1849 * to use sysfs_update_group but some refactoring is needed first.
1851 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1852 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
1855 int __init btrfs_init_sysfs(void)
1859 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
1863 init_feature_attrs();
1864 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1867 ret = sysfs_merge_group(&btrfs_kset->kobj,
1868 &btrfs_static_feature_attr_group);
1870 goto out_remove_group;
1872 #ifdef CONFIG_BTRFS_DEBUG
1873 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1881 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1883 kset_unregister(btrfs_kset);
1888 void __cold btrfs_exit_sysfs(void)
1890 sysfs_unmerge_group(&btrfs_kset->kobj,
1891 &btrfs_static_feature_attr_group);
1892 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1893 #ifdef CONFIG_BTRFS_DEBUG
1894 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1896 kset_unregister(btrfs_kset);