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 ssize_t supported_sectorsizes_show(struct kobject *kobj,
364 struct kobj_attribute *a,
369 /* Only sectorsize == PAGE_SIZE is now supported */
370 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%lu\n", PAGE_SIZE);
374 BTRFS_ATTR(static_feature, supported_sectorsizes,
375 supported_sectorsizes_show);
377 static struct attribute *btrfs_supported_static_feature_attrs[] = {
378 BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
379 BTRFS_ATTR_PTR(static_feature, supported_checksums),
380 BTRFS_ATTR_PTR(static_feature, send_stream_version),
381 BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
382 BTRFS_ATTR_PTR(static_feature, supported_sectorsizes),
387 * Features which only depend on kernel version.
389 * These are listed in /sys/fs/btrfs/features along with
390 * btrfs_feature_attr_group
392 static const struct attribute_group btrfs_static_feature_attr_group = {
394 .attrs = btrfs_supported_static_feature_attrs,
397 #ifdef CONFIG_BTRFS_DEBUG
400 * Discard statistics and tunables
402 #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent)
404 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
405 struct kobj_attribute *a,
408 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
410 return scnprintf(buf, PAGE_SIZE, "%lld\n",
411 atomic64_read(&fs_info->discard_ctl.discardable_bytes));
413 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
415 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
416 struct kobj_attribute *a,
419 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
421 return scnprintf(buf, PAGE_SIZE, "%d\n",
422 atomic_read(&fs_info->discard_ctl.discardable_extents));
424 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
426 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
427 struct kobj_attribute *a,
430 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
432 return scnprintf(buf, PAGE_SIZE, "%lld\n",
433 fs_info->discard_ctl.discard_bitmap_bytes);
435 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
437 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
438 struct kobj_attribute *a,
441 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
443 return scnprintf(buf, PAGE_SIZE, "%lld\n",
444 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
446 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
448 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
449 struct kobj_attribute *a,
452 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
454 return scnprintf(buf, PAGE_SIZE, "%lld\n",
455 fs_info->discard_ctl.discard_extent_bytes);
457 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
459 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
460 struct kobj_attribute *a,
463 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
465 return scnprintf(buf, PAGE_SIZE, "%u\n",
466 READ_ONCE(fs_info->discard_ctl.iops_limit));
469 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
470 struct kobj_attribute *a,
471 const char *buf, size_t len)
473 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
474 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
478 ret = kstrtou32(buf, 10, &iops_limit);
482 WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
483 btrfs_discard_calc_delay(discard_ctl);
484 btrfs_discard_schedule_work(discard_ctl, true);
487 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
488 btrfs_discard_iops_limit_store);
490 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
491 struct kobj_attribute *a,
494 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
496 return scnprintf(buf, PAGE_SIZE, "%u\n",
497 READ_ONCE(fs_info->discard_ctl.kbps_limit));
500 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
501 struct kobj_attribute *a,
502 const char *buf, size_t len)
504 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
505 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
509 ret = kstrtou32(buf, 10, &kbps_limit);
513 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
514 btrfs_discard_schedule_work(discard_ctl, true);
517 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
518 btrfs_discard_kbps_limit_store);
520 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
521 struct kobj_attribute *a,
524 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
526 return scnprintf(buf, PAGE_SIZE, "%llu\n",
527 READ_ONCE(fs_info->discard_ctl.max_discard_size));
530 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
531 struct kobj_attribute *a,
532 const char *buf, size_t len)
534 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
535 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
536 u64 max_discard_size;
539 ret = kstrtou64(buf, 10, &max_discard_size);
543 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
547 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
548 btrfs_discard_max_discard_size_store);
550 static const struct attribute *discard_debug_attrs[] = {
551 BTRFS_ATTR_PTR(discard, discardable_bytes),
552 BTRFS_ATTR_PTR(discard, discardable_extents),
553 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
554 BTRFS_ATTR_PTR(discard, discard_bytes_saved),
555 BTRFS_ATTR_PTR(discard, discard_extent_bytes),
556 BTRFS_ATTR_PTR(discard, iops_limit),
557 BTRFS_ATTR_PTR(discard, kbps_limit),
558 BTRFS_ATTR_PTR(discard, max_discard_size),
563 * Runtime debugging exported via sysfs
565 * /sys/fs/btrfs/debug - applies to module or all filesystems
566 * /sys/fs/btrfs/UUID - applies only to the given filesystem
568 static const struct attribute *btrfs_debug_mount_attrs[] = {
572 static struct attribute *btrfs_debug_feature_attrs[] = {
576 static const struct attribute_group btrfs_debug_feature_attr_group = {
578 .attrs = btrfs_debug_feature_attrs,
583 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
591 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
594 static ssize_t global_rsv_size_show(struct kobject *kobj,
595 struct kobj_attribute *ka, char *buf)
597 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
598 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
599 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
601 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
603 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
604 struct kobj_attribute *a, char *buf)
606 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
607 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
608 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
610 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
612 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
613 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
615 static ssize_t raid_bytes_show(struct kobject *kobj,
616 struct kobj_attribute *attr, char *buf);
617 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
618 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
620 static ssize_t raid_bytes_show(struct kobject *kobj,
621 struct kobj_attribute *attr, char *buf)
624 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
625 struct btrfs_block_group *block_group;
626 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
629 down_read(&sinfo->groups_sem);
630 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
631 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
632 val += block_group->length;
634 val += block_group->used;
636 up_read(&sinfo->groups_sem);
637 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
640 static struct attribute *raid_attrs[] = {
641 BTRFS_ATTR_PTR(raid, total_bytes),
642 BTRFS_ATTR_PTR(raid, used_bytes),
645 ATTRIBUTE_GROUPS(raid);
647 static void release_raid_kobj(struct kobject *kobj)
649 kfree(to_raid_kobj(kobj));
652 static struct kobj_type btrfs_raid_ktype = {
653 .sysfs_ops = &kobj_sysfs_ops,
654 .release = release_raid_kobj,
655 .default_groups = raid_groups,
658 #define SPACE_INFO_ATTR(field) \
659 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
660 struct kobj_attribute *a, \
663 struct btrfs_space_info *sinfo = to_space_info(kobj); \
664 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
666 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
668 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
669 struct kobj_attribute *a,
672 struct btrfs_space_info *sinfo = to_space_info(kobj);
673 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
674 return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
677 SPACE_INFO_ATTR(flags);
678 SPACE_INFO_ATTR(total_bytes);
679 SPACE_INFO_ATTR(bytes_used);
680 SPACE_INFO_ATTR(bytes_pinned);
681 SPACE_INFO_ATTR(bytes_reserved);
682 SPACE_INFO_ATTR(bytes_may_use);
683 SPACE_INFO_ATTR(bytes_readonly);
684 SPACE_INFO_ATTR(bytes_zone_unusable);
685 SPACE_INFO_ATTR(disk_used);
686 SPACE_INFO_ATTR(disk_total);
687 BTRFS_ATTR(space_info, total_bytes_pinned,
688 btrfs_space_info_show_total_bytes_pinned);
690 static struct attribute *space_info_attrs[] = {
691 BTRFS_ATTR_PTR(space_info, flags),
692 BTRFS_ATTR_PTR(space_info, total_bytes),
693 BTRFS_ATTR_PTR(space_info, bytes_used),
694 BTRFS_ATTR_PTR(space_info, bytes_pinned),
695 BTRFS_ATTR_PTR(space_info, bytes_reserved),
696 BTRFS_ATTR_PTR(space_info, bytes_may_use),
697 BTRFS_ATTR_PTR(space_info, bytes_readonly),
698 BTRFS_ATTR_PTR(space_info, bytes_zone_unusable),
699 BTRFS_ATTR_PTR(space_info, disk_used),
700 BTRFS_ATTR_PTR(space_info, disk_total),
701 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
704 ATTRIBUTE_GROUPS(space_info);
706 static void space_info_release(struct kobject *kobj)
708 struct btrfs_space_info *sinfo = to_space_info(kobj);
709 percpu_counter_destroy(&sinfo->total_bytes_pinned);
713 static struct kobj_type space_info_ktype = {
714 .sysfs_ops = &kobj_sysfs_ops,
715 .release = space_info_release,
716 .default_groups = space_info_groups,
719 static const struct attribute *allocation_attrs[] = {
720 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
721 BTRFS_ATTR_PTR(allocation, global_rsv_size),
725 static ssize_t btrfs_label_show(struct kobject *kobj,
726 struct kobj_attribute *a, char *buf)
728 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
729 char *label = fs_info->super_copy->label;
732 spin_lock(&fs_info->super_lock);
733 ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
734 spin_unlock(&fs_info->super_lock);
739 static ssize_t btrfs_label_store(struct kobject *kobj,
740 struct kobj_attribute *a,
741 const char *buf, size_t len)
743 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
749 if (sb_rdonly(fs_info->sb))
753 * p_len is the len until the first occurrence of either
756 p_len = strcspn(buf, "\n");
758 if (p_len >= BTRFS_LABEL_SIZE)
761 spin_lock(&fs_info->super_lock);
762 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
763 memcpy(fs_info->super_copy->label, buf, p_len);
764 spin_unlock(&fs_info->super_lock);
767 * We don't want to do full transaction commit from inside sysfs
769 btrfs_set_pending(fs_info, COMMIT);
770 wake_up_process(fs_info->transaction_kthread);
774 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
776 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
777 struct kobj_attribute *a, char *buf)
779 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
781 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
784 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
786 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
787 struct kobj_attribute *a, char *buf)
789 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
791 return scnprintf(buf, PAGE_SIZE, "%u\n",
792 fs_info->super_copy->sectorsize);
795 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
797 static ssize_t btrfs_clone_alignment_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, "%u\n", fs_info->super_copy->sectorsize);
805 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
807 static ssize_t quota_override_show(struct kobject *kobj,
808 struct kobj_attribute *a, char *buf)
810 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
813 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
814 return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
817 static ssize_t quota_override_store(struct kobject *kobj,
818 struct kobj_attribute *a,
819 const char *buf, size_t len)
821 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
828 if (!capable(CAP_SYS_RESOURCE))
831 err = kstrtoul(buf, 10, &knob);
838 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
840 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
845 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
847 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
848 struct kobj_attribute *a, char *buf)
850 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
852 return scnprintf(buf, PAGE_SIZE, "%pU\n",
853 fs_info->fs_devices->metadata_uuid);
856 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
858 static ssize_t btrfs_checksum_show(struct kobject *kobj,
859 struct kobj_attribute *a, char *buf)
861 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
862 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
864 return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
865 btrfs_super_csum_name(csum_type),
866 crypto_shash_driver_name(fs_info->csum_shash));
869 BTRFS_ATTR(, checksum, btrfs_checksum_show);
871 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
872 struct kobj_attribute *a, char *buf)
874 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
877 switch (READ_ONCE(fs_info->exclusive_operation)) {
878 case BTRFS_EXCLOP_NONE:
881 case BTRFS_EXCLOP_BALANCE:
884 case BTRFS_EXCLOP_DEV_ADD:
885 str = "device add\n";
887 case BTRFS_EXCLOP_DEV_REMOVE:
888 str = "device remove\n";
890 case BTRFS_EXCLOP_DEV_REPLACE:
891 str = "device replace\n";
893 case BTRFS_EXCLOP_RESIZE:
896 case BTRFS_EXCLOP_SWAP_ACTIVATE:
897 str = "swap activate\n";
903 return scnprintf(buf, PAGE_SIZE, "%s", str);
905 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
907 static ssize_t btrfs_generation_show(struct kobject *kobj,
908 struct kobj_attribute *a, char *buf)
910 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
912 return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation);
914 BTRFS_ATTR(, generation, btrfs_generation_show);
917 * Look for an exact string @string in @buffer with possible leading or
918 * trailing whitespace
920 static bool strmatch(const char *buffer, const char *string)
922 const size_t len = strlen(string);
924 /* Skip leading whitespace */
925 buffer = skip_spaces(buffer);
927 /* Match entire string, check if the rest is whitespace or empty */
928 if (strncmp(string, buffer, len) == 0 &&
929 strlen(skip_spaces(buffer + len)) == 0)
935 static const char * const btrfs_read_policy_name[] = { "pid" };
937 static ssize_t btrfs_read_policy_show(struct kobject *kobj,
938 struct kobj_attribute *a, char *buf)
940 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
944 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
945 if (fs_devices->read_policy == i)
946 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s[%s]",
947 (ret == 0 ? "" : " "),
948 btrfs_read_policy_name[i]);
950 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
951 (ret == 0 ? "" : " "),
952 btrfs_read_policy_name[i]);
955 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
960 static ssize_t btrfs_read_policy_store(struct kobject *kobj,
961 struct kobj_attribute *a,
962 const char *buf, size_t len)
964 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
967 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
968 if (strmatch(buf, btrfs_read_policy_name[i])) {
969 if (i != fs_devices->read_policy) {
970 fs_devices->read_policy = i;
971 btrfs_info(fs_devices->fs_info,
972 "read policy set to '%s'",
973 btrfs_read_policy_name[i]);
981 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store);
983 static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj,
984 struct kobj_attribute *a,
987 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
990 ret = scnprintf(buf, PAGE_SIZE, "%d\n", fs_info->bg_reclaim_threshold);
995 static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj,
996 struct kobj_attribute *a,
997 const char *buf, size_t len)
999 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1003 ret = kstrtoint(buf, 10, &thresh);
1007 if (thresh <= 50 || thresh > 100)
1010 fs_info->bg_reclaim_threshold = thresh;
1014 BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show,
1015 btrfs_bg_reclaim_threshold_store);
1017 static const struct attribute *btrfs_attrs[] = {
1018 BTRFS_ATTR_PTR(, label),
1019 BTRFS_ATTR_PTR(, nodesize),
1020 BTRFS_ATTR_PTR(, sectorsize),
1021 BTRFS_ATTR_PTR(, clone_alignment),
1022 BTRFS_ATTR_PTR(, quota_override),
1023 BTRFS_ATTR_PTR(, metadata_uuid),
1024 BTRFS_ATTR_PTR(, checksum),
1025 BTRFS_ATTR_PTR(, exclusive_operation),
1026 BTRFS_ATTR_PTR(, generation),
1027 BTRFS_ATTR_PTR(, read_policy),
1028 BTRFS_ATTR_PTR(, bg_reclaim_threshold),
1032 static void btrfs_release_fsid_kobj(struct kobject *kobj)
1034 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
1036 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
1037 complete(&fs_devs->kobj_unregister);
1040 static struct kobj_type btrfs_ktype = {
1041 .sysfs_ops = &kobj_sysfs_ops,
1042 .release = btrfs_release_fsid_kobj,
1045 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
1047 if (kobj->ktype != &btrfs_ktype)
1049 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
1052 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
1054 if (kobj->ktype != &btrfs_ktype)
1056 return to_fs_devs(kobj)->fs_info;
1059 #define NUM_FEATURE_BITS 64
1060 #define BTRFS_FEATURE_NAME_MAX 13
1061 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
1062 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
1064 static const u64 supported_feature_masks[FEAT_MAX] = {
1065 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
1066 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
1067 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
1070 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
1074 for (set = 0; set < FEAT_MAX; set++) {
1076 struct attribute *attrs[2];
1077 struct attribute_group agroup = {
1081 u64 features = get_features(fs_info, set);
1082 features &= ~supported_feature_masks[set];
1088 for (i = 0; i < NUM_FEATURE_BITS; i++) {
1089 struct btrfs_feature_attr *fa;
1091 if (!(features & (1ULL << i)))
1094 fa = &btrfs_feature_attrs[set][i];
1095 attrs[0] = &fa->kobj_attr.attr;
1098 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
1103 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
1111 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1113 if (fs_devs->devinfo_kobj) {
1114 kobject_del(fs_devs->devinfo_kobj);
1115 kobject_put(fs_devs->devinfo_kobj);
1116 fs_devs->devinfo_kobj = NULL;
1119 if (fs_devs->devices_kobj) {
1120 kobject_del(fs_devs->devices_kobj);
1121 kobject_put(fs_devs->devices_kobj);
1122 fs_devs->devices_kobj = NULL;
1125 if (fs_devs->fsid_kobj.state_initialized) {
1126 kobject_del(&fs_devs->fsid_kobj);
1127 kobject_put(&fs_devs->fsid_kobj);
1128 wait_for_completion(&fs_devs->kobj_unregister);
1132 /* when fs_devs is NULL it will remove all fsid kobject */
1133 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1135 struct list_head *fs_uuids = btrfs_get_fs_uuids();
1138 __btrfs_sysfs_remove_fsid(fs_devs);
1142 list_for_each_entry(fs_devs, fs_uuids, fs_list) {
1143 __btrfs_sysfs_remove_fsid(fs_devs);
1147 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
1149 struct btrfs_device *device;
1150 struct btrfs_fs_devices *seed;
1152 list_for_each_entry(device, &fs_devices->devices, dev_list)
1153 btrfs_sysfs_remove_device(device);
1155 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1156 list_for_each_entry(device, &seed->devices, dev_list)
1157 btrfs_sysfs_remove_device(device);
1161 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
1163 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1165 sysfs_remove_link(fsid_kobj, "bdi");
1167 if (fs_info->space_info_kobj) {
1168 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
1169 kobject_del(fs_info->space_info_kobj);
1170 kobject_put(fs_info->space_info_kobj);
1172 #ifdef CONFIG_BTRFS_DEBUG
1173 if (fs_info->discard_debug_kobj) {
1174 sysfs_remove_files(fs_info->discard_debug_kobj,
1175 discard_debug_attrs);
1176 kobject_del(fs_info->discard_debug_kobj);
1177 kobject_put(fs_info->discard_debug_kobj);
1179 if (fs_info->debug_kobj) {
1180 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1181 kobject_del(fs_info->debug_kobj);
1182 kobject_put(fs_info->debug_kobj);
1185 addrm_unknown_feature_attrs(fs_info, false);
1186 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1187 sysfs_remove_files(fsid_kobj, btrfs_attrs);
1188 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
1191 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
1192 [FEAT_COMPAT] = "compat",
1193 [FEAT_COMPAT_RO] = "compat_ro",
1194 [FEAT_INCOMPAT] = "incompat",
1197 const char *btrfs_feature_set_name(enum btrfs_feature_set set)
1199 return btrfs_feature_set_names[set];
1202 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
1204 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
1209 str = kmalloc(bufsize, GFP_KERNEL);
1213 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1216 if (!(flags & (1ULL << i)))
1219 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
1220 len += scnprintf(str + len, bufsize - len, "%s%s",
1221 len ? "," : "", name);
1227 static void init_feature_attrs(void)
1229 struct btrfs_feature_attr *fa;
1232 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
1233 ARRAY_SIZE(btrfs_feature_attrs));
1234 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
1235 ARRAY_SIZE(btrfs_feature_attrs[0]));
1237 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1238 memset(btrfs_unknown_feature_names, 0,
1239 sizeof(btrfs_unknown_feature_names));
1241 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1242 struct btrfs_feature_attr *sfa;
1243 struct attribute *a = btrfs_supported_feature_attrs[i];
1245 sfa = attr_to_btrfs_feature_attr(a);
1246 bit = ilog2(sfa->feature_bit);
1247 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1249 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1252 for (set = 0; set < FEAT_MAX; set++) {
1253 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1254 char *name = btrfs_unknown_feature_names[set][i];
1255 fa = &btrfs_feature_attrs[set][i];
1257 if (fa->kobj_attr.attr.name)
1260 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1261 btrfs_feature_set_names[set], i);
1263 fa->kobj_attr.attr.name = name;
1264 fa->kobj_attr.attr.mode = S_IRUGO;
1265 fa->feature_set = set;
1266 fa->feature_bit = 1ULL << i;
1272 * Create a sysfs entry for a given block group type at path
1273 * /sys/fs/btrfs/UUID/allocation/data/TYPE
1275 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1277 struct btrfs_fs_info *fs_info = cache->fs_info;
1278 struct btrfs_space_info *space_info = cache->space_info;
1279 struct raid_kobject *rkobj;
1280 const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1281 unsigned int nofs_flag;
1285 * Setup a NOFS context because kobject_add(), deep in its call chain,
1286 * does GFP_KERNEL allocations, and we are often called in a context
1287 * where if reclaim is triggered we can deadlock (we are either holding
1288 * a transaction handle or some lock required for a transaction
1291 nofs_flag = memalloc_nofs_save();
1293 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1295 memalloc_nofs_restore(nofs_flag);
1296 btrfs_warn(cache->fs_info,
1297 "couldn't alloc memory for raid level kobject");
1301 rkobj->flags = cache->flags;
1302 kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1305 * We call this either on mount, or if we've created a block group for a
1306 * new index type while running (i.e. when restriping). The running
1307 * case is tricky because we could race with other threads, so we need
1308 * to have this check to make sure we didn't already init the kobject.
1310 * We don't have to protect on the free side because it only happens on
1313 spin_lock(&space_info->lock);
1314 if (space_info->block_group_kobjs[index]) {
1315 spin_unlock(&space_info->lock);
1316 kobject_put(&rkobj->kobj);
1319 space_info->block_group_kobjs[index] = &rkobj->kobj;
1321 spin_unlock(&space_info->lock);
1323 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1324 btrfs_bg_type_to_raid_name(rkobj->flags));
1325 memalloc_nofs_restore(nofs_flag);
1327 spin_lock(&space_info->lock);
1328 space_info->block_group_kobjs[index] = NULL;
1329 spin_unlock(&space_info->lock);
1330 kobject_put(&rkobj->kobj);
1332 "failed to add kobject for block cache, ignoring");
1338 * Remove sysfs directories for all block group types of a given space info and
1339 * the space info as well
1341 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1345 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1346 struct kobject *kobj;
1348 kobj = space_info->block_group_kobjs[i];
1349 space_info->block_group_kobjs[i] = NULL;
1355 kobject_del(&space_info->kobj);
1356 kobject_put(&space_info->kobj);
1359 static const char *alloc_name(u64 flags)
1362 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1364 case BTRFS_BLOCK_GROUP_METADATA:
1366 case BTRFS_BLOCK_GROUP_DATA:
1368 case BTRFS_BLOCK_GROUP_SYSTEM:
1372 return "invalid-combination";
1377 * Create a sysfs entry for a space info type at path
1378 * /sys/fs/btrfs/UUID/allocation/TYPE
1380 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1381 struct btrfs_space_info *space_info)
1385 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1386 fs_info->space_info_kobj, "%s",
1387 alloc_name(space_info->flags));
1389 kobject_put(&space_info->kobj);
1396 void btrfs_sysfs_remove_device(struct btrfs_device *device)
1398 struct kobject *devices_kobj;
1401 * Seed fs_devices devices_kobj aren't used, fetch kobject from the
1402 * fs_info::fs_devices.
1404 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1405 ASSERT(devices_kobj);
1408 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name);
1410 if (device->devid_kobj.state_initialized) {
1411 kobject_del(&device->devid_kobj);
1412 kobject_put(&device->devid_kobj);
1413 wait_for_completion(&device->kobj_unregister);
1417 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1418 struct kobj_attribute *a,
1422 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1425 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1427 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1429 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1431 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1432 struct kobj_attribute *a, char *buf)
1435 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1438 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1440 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1442 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1444 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1445 struct kobj_attribute *a,
1449 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1452 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1454 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1456 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1458 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1459 struct kobj_attribute *a, char *buf)
1462 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1465 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1467 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1469 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1471 static struct attribute *devid_attrs[] = {
1472 BTRFS_ATTR_PTR(devid, in_fs_metadata),
1473 BTRFS_ATTR_PTR(devid, missing),
1474 BTRFS_ATTR_PTR(devid, replace_target),
1475 BTRFS_ATTR_PTR(devid, writeable),
1478 ATTRIBUTE_GROUPS(devid);
1480 static void btrfs_release_devid_kobj(struct kobject *kobj)
1482 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1485 memset(&device->devid_kobj, 0, sizeof(struct kobject));
1486 complete(&device->kobj_unregister);
1489 static struct kobj_type devid_ktype = {
1490 .sysfs_ops = &kobj_sysfs_ops,
1491 .default_groups = devid_groups,
1492 .release = btrfs_release_devid_kobj,
1495 int btrfs_sysfs_add_device(struct btrfs_device *device)
1498 unsigned int nofs_flag;
1499 struct kobject *devices_kobj;
1500 struct kobject *devinfo_kobj;
1503 * Make sure we use the fs_info::fs_devices to fetch the kobjects even
1504 * for the seed fs_devices
1506 devices_kobj = device->fs_info->fs_devices->devices_kobj;
1507 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
1508 ASSERT(devices_kobj);
1509 ASSERT(devinfo_kobj);
1511 nofs_flag = memalloc_nofs_save();
1514 struct kobject *disk_kobj = bdev_kobj(device->bdev);
1516 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
1518 btrfs_warn(device->fs_info,
1519 "creating sysfs device link for devid %llu failed: %d",
1520 device->devid, ret);
1525 init_completion(&device->kobj_unregister);
1526 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
1527 devinfo_kobj, "%llu", device->devid);
1529 kobject_put(&device->devid_kobj);
1530 btrfs_warn(device->fs_info,
1531 "devinfo init for devid %llu failed: %d",
1532 device->devid, ret);
1536 memalloc_nofs_restore(nofs_flag);
1540 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
1543 struct btrfs_device *device;
1544 struct btrfs_fs_devices *seed;
1546 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1547 ret = btrfs_sysfs_add_device(device);
1552 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1553 list_for_each_entry(device, &seed->devices, dev_list) {
1554 ret = btrfs_sysfs_add_device(device);
1563 btrfs_sysfs_remove_fs_devices(fs_devices);
1567 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1571 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1573 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1574 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1575 &disk_to_dev(bdev->bd_disk)->kobj);
1578 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
1581 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1584 * Sprouting changes fsid of the mounted filesystem, rename the fsid
1587 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
1588 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1589 btrfs_warn(fs_devices->fs_info,
1590 "sysfs: failed to create fsid for sprout");
1593 void btrfs_sysfs_update_devid(struct btrfs_device *device)
1597 snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1599 if (kobject_rename(&device->devid_kobj, tmp))
1600 btrfs_warn(device->fs_devices->fs_info,
1601 "sysfs: failed to update devid for %llu",
1605 /* /sys/fs/btrfs/ entry */
1606 static struct kset *btrfs_kset;
1610 * /sys/fs/btrfs/UUID
1612 * Can be called by the device discovery thread.
1614 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1618 init_completion(&fs_devs->kobj_unregister);
1619 fs_devs->fsid_kobj.kset = btrfs_kset;
1620 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1621 "%pU", fs_devs->fsid);
1623 kobject_put(&fs_devs->fsid_kobj);
1627 fs_devs->devices_kobj = kobject_create_and_add("devices",
1628 &fs_devs->fsid_kobj);
1629 if (!fs_devs->devices_kobj) {
1630 btrfs_err(fs_devs->fs_info,
1631 "failed to init sysfs device interface");
1632 btrfs_sysfs_remove_fsid(fs_devs);
1636 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1637 &fs_devs->fsid_kobj);
1638 if (!fs_devs->devinfo_kobj) {
1639 btrfs_err(fs_devs->fs_info,
1640 "failed to init sysfs devinfo kobject");
1641 btrfs_sysfs_remove_fsid(fs_devs);
1648 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1651 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
1652 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
1654 error = btrfs_sysfs_add_fs_devices(fs_devs);
1658 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
1660 btrfs_sysfs_remove_fs_devices(fs_devs);
1664 error = sysfs_create_group(fsid_kobj,
1665 &btrfs_feature_attr_group);
1669 #ifdef CONFIG_BTRFS_DEBUG
1670 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
1671 if (!fs_info->debug_kobj) {
1676 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1680 /* Discard directory */
1681 fs_info->discard_debug_kobj = kobject_create_and_add("discard",
1682 fs_info->debug_kobj);
1683 if (!fs_info->discard_debug_kobj) {
1688 error = sysfs_create_files(fs_info->discard_debug_kobj,
1689 discard_debug_attrs);
1694 error = addrm_unknown_feature_attrs(fs_info, true);
1698 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
1702 fs_info->space_info_kobj = kobject_create_and_add("allocation",
1704 if (!fs_info->space_info_kobj) {
1709 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
1715 btrfs_sysfs_remove_mounted(fs_info);
1719 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
1721 return to_fs_info(kobj->parent->parent);
1724 #define QGROUP_ATTR(_member, _show_name) \
1725 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
1726 struct kobj_attribute *a, \
1729 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1730 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1731 struct btrfs_qgroup, kobj); \
1732 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
1734 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
1736 #define QGROUP_RSV_ATTR(_name, _type) \
1737 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
1738 struct kobj_attribute *a, \
1741 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1742 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1743 struct btrfs_qgroup, kobj); \
1744 return btrfs_show_u64(&qgroup->rsv.values[_type], \
1745 &fs_info->qgroup_lock, buf); \
1747 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
1749 QGROUP_ATTR(rfer, referenced);
1750 QGROUP_ATTR(excl, exclusive);
1751 QGROUP_ATTR(max_rfer, max_referenced);
1752 QGROUP_ATTR(max_excl, max_exclusive);
1753 QGROUP_ATTR(lim_flags, limit_flags);
1754 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
1755 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
1756 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
1758 static struct attribute *qgroup_attrs[] = {
1759 BTRFS_ATTR_PTR(qgroup, referenced),
1760 BTRFS_ATTR_PTR(qgroup, exclusive),
1761 BTRFS_ATTR_PTR(qgroup, max_referenced),
1762 BTRFS_ATTR_PTR(qgroup, max_exclusive),
1763 BTRFS_ATTR_PTR(qgroup, limit_flags),
1764 BTRFS_ATTR_PTR(qgroup, rsv_data),
1765 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
1766 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
1769 ATTRIBUTE_GROUPS(qgroup);
1771 static void qgroup_release(struct kobject *kobj)
1773 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
1775 memset(&qgroup->kobj, 0, sizeof(*kobj));
1778 static struct kobj_type qgroup_ktype = {
1779 .sysfs_ops = &kobj_sysfs_ops,
1780 .release = qgroup_release,
1781 .default_groups = qgroup_groups,
1784 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
1785 struct btrfs_qgroup *qgroup)
1787 struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
1790 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1792 if (qgroup->kobj.state_initialized)
1797 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
1798 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
1799 btrfs_qgroup_subvolid(qgroup->qgroupid));
1801 kobject_put(&qgroup->kobj);
1806 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
1808 struct btrfs_qgroup *qgroup;
1809 struct btrfs_qgroup *next;
1811 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1814 rbtree_postorder_for_each_entry_safe(qgroup, next,
1815 &fs_info->qgroup_tree, node)
1816 btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
1817 if (fs_info->qgroups_kobj) {
1818 kobject_del(fs_info->qgroups_kobj);
1819 kobject_put(fs_info->qgroups_kobj);
1820 fs_info->qgroups_kobj = NULL;
1824 /* Called when qgroups get initialized, thus there is no need for locking */
1825 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
1827 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1828 struct btrfs_qgroup *qgroup;
1829 struct btrfs_qgroup *next;
1832 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1836 if (fs_info->qgroups_kobj)
1839 fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj);
1840 if (!fs_info->qgroups_kobj) {
1844 rbtree_postorder_for_each_entry_safe(qgroup, next,
1845 &fs_info->qgroup_tree, node) {
1846 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
1853 btrfs_sysfs_del_qgroups(fs_info);
1857 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
1858 struct btrfs_qgroup *qgroup)
1860 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1863 if (qgroup->kobj.state_initialized) {
1864 kobject_del(&qgroup->kobj);
1865 kobject_put(&qgroup->kobj);
1870 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
1871 * values in superblock. Call after any changes to incompat/compat_ro flags
1873 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
1874 u64 bit, enum btrfs_feature_set set)
1876 struct btrfs_fs_devices *fs_devs;
1877 struct kobject *fsid_kobj;
1878 u64 __maybe_unused features;
1879 int __maybe_unused ret;
1885 * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
1886 * safe when called from some contexts (eg. balance)
1888 features = get_features(fs_info, set);
1889 ASSERT(bit & supported_feature_masks[set]);
1891 fs_devs = fs_info->fs_devices;
1892 fsid_kobj = &fs_devs->fsid_kobj;
1894 if (!fsid_kobj->state_initialized)
1898 * FIXME: this is too heavy to update just one value, ideally we'd like
1899 * to use sysfs_update_group but some refactoring is needed first.
1901 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1902 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
1905 int __init btrfs_init_sysfs(void)
1909 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
1913 init_feature_attrs();
1914 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1917 ret = sysfs_merge_group(&btrfs_kset->kobj,
1918 &btrfs_static_feature_attr_group);
1920 goto out_remove_group;
1922 #ifdef CONFIG_BTRFS_DEBUG
1923 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1931 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1933 kset_unregister(btrfs_kset);
1938 void __cold btrfs_exit_sysfs(void)
1940 sysfs_unmerge_group(&btrfs_kset->kobj,
1941 &btrfs_static_feature_attr_group);
1942 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1943 #ifdef CONFIG_BTRFS_DEBUG
1944 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1946 kset_unregister(btrfs_kset);