2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/spinlock.h>
22 #include <linux/completion.h>
23 #include <linux/buffer_head.h>
24 #include <linux/kobject.h>
25 #include <linux/bug.h>
26 #include <linux/genhd.h>
27 #include <linux/debugfs.h>
31 #include "transaction.h"
35 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
36 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
38 static u64 get_features(struct btrfs_fs_info *fs_info,
39 enum btrfs_feature_set set)
41 struct btrfs_super_block *disk_super = fs_info->super_copy;
42 if (set == FEAT_COMPAT)
43 return btrfs_super_compat_flags(disk_super);
44 else if (set == FEAT_COMPAT_RO)
45 return btrfs_super_compat_ro_flags(disk_super);
47 return btrfs_super_incompat_flags(disk_super);
50 static void set_features(struct btrfs_fs_info *fs_info,
51 enum btrfs_feature_set set, u64 features)
53 struct btrfs_super_block *disk_super = fs_info->super_copy;
54 if (set == FEAT_COMPAT)
55 btrfs_set_super_compat_flags(disk_super, features);
56 else if (set == FEAT_COMPAT_RO)
57 btrfs_set_super_compat_ro_flags(disk_super, features);
59 btrfs_set_super_incompat_flags(disk_super, features);
62 static int can_modify_feature(struct btrfs_feature_attr *fa)
66 switch (fa->feature_set) {
68 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
69 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
72 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
73 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
76 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
77 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
80 pr_warn("btrfs: sysfs: unknown feature set %d\n",
85 if (set & fa->feature_bit)
87 if (clear & fa->feature_bit)
93 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
94 struct kobj_attribute *a, char *buf)
97 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
98 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
100 u64 features = get_features(fs_info, fa->feature_set);
101 if (features & fa->feature_bit)
104 val = can_modify_feature(fa);
106 return snprintf(buf, PAGE_SIZE, "%d\n", val);
109 static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
110 struct kobj_attribute *a,
111 const char *buf, size_t count)
113 struct btrfs_fs_info *fs_info;
114 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
115 u64 features, set, clear;
119 fs_info = to_fs_info(kobj);
123 if (sb_rdonly(fs_info->sb))
126 ret = kstrtoul(skip_spaces(buf), 0, &val);
130 if (fa->feature_set == FEAT_COMPAT) {
131 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
132 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
133 } else if (fa->feature_set == FEAT_COMPAT_RO) {
134 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
135 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
137 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
138 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
141 features = get_features(fs_info, fa->feature_set);
144 if ((val && (features & fa->feature_bit)) ||
145 (!val && !(features & fa->feature_bit)))
148 if ((val && !(set & fa->feature_bit)) ||
149 (!val && !(clear & fa->feature_bit))) {
151 "%sabling feature %s on mounted fs is not supported.",
152 val ? "En" : "Dis", fa->kobj_attr.attr.name);
156 btrfs_info(fs_info, "%s %s feature flag",
157 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
159 spin_lock(&fs_info->super_lock);
160 features = get_features(fs_info, fa->feature_set);
162 features |= fa->feature_bit;
164 features &= ~fa->feature_bit;
165 set_features(fs_info, fa->feature_set, features);
166 spin_unlock(&fs_info->super_lock);
169 * We don't want to do full transaction commit from inside sysfs
171 btrfs_set_pending(fs_info, COMMIT);
172 wake_up_process(fs_info->transaction_kthread);
177 static umode_t btrfs_feature_visible(struct kobject *kobj,
178 struct attribute *attr, int unused)
180 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
181 umode_t mode = attr->mode;
184 struct btrfs_feature_attr *fa;
187 fa = attr_to_btrfs_feature_attr(attr);
188 features = get_features(fs_info, fa->feature_set);
190 if (can_modify_feature(fa))
192 else if (!(features & fa->feature_bit))
199 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
200 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
201 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
202 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
203 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
204 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
205 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
206 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
207 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
208 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
209 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
211 static struct attribute *btrfs_supported_feature_attrs[] = {
212 BTRFS_FEAT_ATTR_PTR(mixed_backref),
213 BTRFS_FEAT_ATTR_PTR(default_subvol),
214 BTRFS_FEAT_ATTR_PTR(mixed_groups),
215 BTRFS_FEAT_ATTR_PTR(compress_lzo),
216 BTRFS_FEAT_ATTR_PTR(compress_zstd),
217 BTRFS_FEAT_ATTR_PTR(big_metadata),
218 BTRFS_FEAT_ATTR_PTR(extended_iref),
219 BTRFS_FEAT_ATTR_PTR(raid56),
220 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
221 BTRFS_FEAT_ATTR_PTR(no_holes),
222 BTRFS_FEAT_ATTR_PTR(free_space_tree),
226 static const struct attribute_group btrfs_feature_attr_group = {
228 .is_visible = btrfs_feature_visible,
229 .attrs = btrfs_supported_feature_attrs,
232 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
240 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
243 static ssize_t global_rsv_size_show(struct kobject *kobj,
244 struct kobj_attribute *ka, char *buf)
246 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
247 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
248 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
250 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
252 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
253 struct kobj_attribute *a, char *buf)
255 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
256 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
257 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
259 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
261 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
262 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
264 static ssize_t raid_bytes_show(struct kobject *kobj,
265 struct kobj_attribute *attr, char *buf);
266 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
267 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
269 static ssize_t raid_bytes_show(struct kobject *kobj,
270 struct kobj_attribute *attr, char *buf)
273 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
274 struct btrfs_block_group_cache *block_group;
275 int index = to_raid_kobj(kobj)->raid_type;
278 down_read(&sinfo->groups_sem);
279 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
280 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
281 val += block_group->key.offset;
283 val += btrfs_block_group_used(&block_group->item);
285 up_read(&sinfo->groups_sem);
286 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
289 static struct attribute *raid_attributes[] = {
290 BTRFS_ATTR_PTR(raid, total_bytes),
291 BTRFS_ATTR_PTR(raid, used_bytes),
295 static void release_raid_kobj(struct kobject *kobj)
297 kfree(to_raid_kobj(kobj));
300 struct kobj_type btrfs_raid_ktype = {
301 .sysfs_ops = &kobj_sysfs_ops,
302 .release = release_raid_kobj,
303 .default_attrs = raid_attributes,
306 #define SPACE_INFO_ATTR(field) \
307 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
308 struct kobj_attribute *a, \
311 struct btrfs_space_info *sinfo = to_space_info(kobj); \
312 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
314 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
316 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
317 struct kobj_attribute *a,
320 struct btrfs_space_info *sinfo = to_space_info(kobj);
321 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
322 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
325 SPACE_INFO_ATTR(flags);
326 SPACE_INFO_ATTR(total_bytes);
327 SPACE_INFO_ATTR(bytes_used);
328 SPACE_INFO_ATTR(bytes_pinned);
329 SPACE_INFO_ATTR(bytes_reserved);
330 SPACE_INFO_ATTR(bytes_may_use);
331 SPACE_INFO_ATTR(bytes_readonly);
332 SPACE_INFO_ATTR(disk_used);
333 SPACE_INFO_ATTR(disk_total);
334 BTRFS_ATTR(space_info, total_bytes_pinned,
335 btrfs_space_info_show_total_bytes_pinned);
337 static struct attribute *space_info_attrs[] = {
338 BTRFS_ATTR_PTR(space_info, flags),
339 BTRFS_ATTR_PTR(space_info, total_bytes),
340 BTRFS_ATTR_PTR(space_info, bytes_used),
341 BTRFS_ATTR_PTR(space_info, bytes_pinned),
342 BTRFS_ATTR_PTR(space_info, bytes_reserved),
343 BTRFS_ATTR_PTR(space_info, bytes_may_use),
344 BTRFS_ATTR_PTR(space_info, bytes_readonly),
345 BTRFS_ATTR_PTR(space_info, disk_used),
346 BTRFS_ATTR_PTR(space_info, disk_total),
347 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
351 static void space_info_release(struct kobject *kobj)
353 struct btrfs_space_info *sinfo = to_space_info(kobj);
354 percpu_counter_destroy(&sinfo->total_bytes_pinned);
358 struct kobj_type space_info_ktype = {
359 .sysfs_ops = &kobj_sysfs_ops,
360 .release = space_info_release,
361 .default_attrs = space_info_attrs,
364 static const struct attribute *allocation_attrs[] = {
365 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
366 BTRFS_ATTR_PTR(allocation, global_rsv_size),
370 static ssize_t btrfs_label_show(struct kobject *kobj,
371 struct kobj_attribute *a, char *buf)
373 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
374 char *label = fs_info->super_copy->label;
377 spin_lock(&fs_info->super_lock);
378 ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
379 spin_unlock(&fs_info->super_lock);
384 static ssize_t btrfs_label_store(struct kobject *kobj,
385 struct kobj_attribute *a,
386 const char *buf, size_t len)
388 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
394 if (sb_rdonly(fs_info->sb))
398 * p_len is the len until the first occurrence of either
401 p_len = strcspn(buf, "\n");
403 if (p_len >= BTRFS_LABEL_SIZE)
406 spin_lock(&fs_info->super_lock);
407 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
408 memcpy(fs_info->super_copy->label, buf, p_len);
409 spin_unlock(&fs_info->super_lock);
412 * We don't want to do full transaction commit from inside sysfs
414 btrfs_set_pending(fs_info, COMMIT);
415 wake_up_process(fs_info->transaction_kthread);
419 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
421 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
422 struct kobj_attribute *a, char *buf)
424 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
426 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->nodesize);
429 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
431 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
432 struct kobj_attribute *a, char *buf)
434 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
436 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->sectorsize);
439 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
441 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
442 struct kobj_attribute *a, char *buf)
444 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
446 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->sectorsize);
449 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
451 static ssize_t quota_override_show(struct kobject *kobj,
452 struct kobj_attribute *a, char *buf)
454 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
457 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
458 return snprintf(buf, PAGE_SIZE, "%d\n", quota_override);
461 static ssize_t quota_override_store(struct kobject *kobj,
462 struct kobj_attribute *a,
463 const char *buf, size_t len)
465 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
472 if (!capable(CAP_SYS_RESOURCE))
475 err = kstrtoul(buf, 10, &knob);
482 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
484 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
489 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
491 static const struct attribute *btrfs_attrs[] = {
492 BTRFS_ATTR_PTR(, label),
493 BTRFS_ATTR_PTR(, nodesize),
494 BTRFS_ATTR_PTR(, sectorsize),
495 BTRFS_ATTR_PTR(, clone_alignment),
496 BTRFS_ATTR_PTR(, quota_override),
500 static void btrfs_release_fsid_kobj(struct kobject *kobj)
502 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
504 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
505 complete(&fs_devs->kobj_unregister);
508 static struct kobj_type btrfs_ktype = {
509 .sysfs_ops = &kobj_sysfs_ops,
510 .release = btrfs_release_fsid_kobj,
513 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
515 if (kobj->ktype != &btrfs_ktype)
517 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
520 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
522 if (kobj->ktype != &btrfs_ktype)
524 return to_fs_devs(kobj)->fs_info;
527 #define NUM_FEATURE_BITS 64
528 static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
529 static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
531 static const u64 supported_feature_masks[3] = {
532 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
533 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
534 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
537 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
541 for (set = 0; set < FEAT_MAX; set++) {
543 struct attribute *attrs[2];
544 struct attribute_group agroup = {
548 u64 features = get_features(fs_info, set);
549 features &= ~supported_feature_masks[set];
555 for (i = 0; i < NUM_FEATURE_BITS; i++) {
556 struct btrfs_feature_attr *fa;
558 if (!(features & (1ULL << i)))
561 fa = &btrfs_feature_attrs[set][i];
562 attrs[0] = &fa->kobj_attr.attr;
565 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
570 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
578 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
580 if (fs_devs->device_dir_kobj) {
581 kobject_del(fs_devs->device_dir_kobj);
582 kobject_put(fs_devs->device_dir_kobj);
583 fs_devs->device_dir_kobj = NULL;
586 if (fs_devs->fsid_kobj.state_initialized) {
587 kobject_del(&fs_devs->fsid_kobj);
588 kobject_put(&fs_devs->fsid_kobj);
589 wait_for_completion(&fs_devs->kobj_unregister);
593 /* when fs_devs is NULL it will remove all fsid kobject */
594 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
596 struct list_head *fs_uuids = btrfs_get_fs_uuids();
599 __btrfs_sysfs_remove_fsid(fs_devs);
603 list_for_each_entry(fs_devs, fs_uuids, list) {
604 __btrfs_sysfs_remove_fsid(fs_devs);
608 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
610 btrfs_reset_fs_info_ptr(fs_info);
612 if (fs_info->space_info_kobj) {
613 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
614 kobject_del(fs_info->space_info_kobj);
615 kobject_put(fs_info->space_info_kobj);
617 addrm_unknown_feature_attrs(fs_info, false);
618 sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group);
619 sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs);
620 btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL);
623 const char * const btrfs_feature_set_names[3] = {
624 [FEAT_COMPAT] = "compat",
625 [FEAT_COMPAT_RO] = "compat_ro",
626 [FEAT_INCOMPAT] = "incompat",
629 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
631 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
636 str = kmalloc(bufsize, GFP_KERNEL);
640 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
643 if (!(flags & (1ULL << i)))
646 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
647 len += snprintf(str + len, bufsize - len, "%s%s",
648 len ? "," : "", name);
654 static void init_feature_attrs(void)
656 struct btrfs_feature_attr *fa;
659 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
660 ARRAY_SIZE(btrfs_feature_attrs));
661 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
662 ARRAY_SIZE(btrfs_feature_attrs[0]));
664 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
665 memset(btrfs_unknown_feature_names, 0,
666 sizeof(btrfs_unknown_feature_names));
668 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
669 struct btrfs_feature_attr *sfa;
670 struct attribute *a = btrfs_supported_feature_attrs[i];
672 sfa = attr_to_btrfs_feature_attr(a);
673 bit = ilog2(sfa->feature_bit);
674 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
676 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
679 for (set = 0; set < FEAT_MAX; set++) {
680 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
681 char *name = btrfs_unknown_feature_names[set][i];
682 fa = &btrfs_feature_attrs[set][i];
684 if (fa->kobj_attr.attr.name)
687 snprintf(name, 13, "%s:%u",
688 btrfs_feature_set_names[set], i);
690 fa->kobj_attr.attr.name = name;
691 fa->kobj_attr.attr.mode = S_IRUGO;
692 fa->feature_set = set;
693 fa->feature_bit = 1ULL << i;
698 /* when one_device is NULL, it removes all device links */
700 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
701 struct btrfs_device *one_device)
703 struct hd_struct *disk;
704 struct kobject *disk_kobj;
706 if (!fs_devices->device_dir_kobj)
709 if (one_device && one_device->bdev) {
710 disk = one_device->bdev->bd_part;
711 disk_kobj = &part_to_dev(disk)->kobj;
713 sysfs_remove_link(fs_devices->device_dir_kobj,
720 list_for_each_entry(one_device,
721 &fs_devices->devices, dev_list) {
722 if (!one_device->bdev)
724 disk = one_device->bdev->bd_part;
725 disk_kobj = &part_to_dev(disk)->kobj;
727 sysfs_remove_link(fs_devices->device_dir_kobj,
734 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
736 if (!fs_devs->device_dir_kobj)
737 fs_devs->device_dir_kobj = kobject_create_and_add("devices",
738 &fs_devs->fsid_kobj);
740 if (!fs_devs->device_dir_kobj)
746 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
747 struct btrfs_device *one_device)
750 struct btrfs_device *dev;
752 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
753 struct hd_struct *disk;
754 struct kobject *disk_kobj;
759 if (one_device && one_device != dev)
762 disk = dev->bdev->bd_part;
763 disk_kobj = &part_to_dev(disk)->kobj;
765 error = sysfs_create_link(fs_devices->device_dir_kobj,
766 disk_kobj, disk_kobj->name);
774 /* /sys/fs/btrfs/ entry */
775 static struct kset *btrfs_kset;
777 /* /sys/kernel/debug/btrfs */
778 static struct dentry *btrfs_debugfs_root_dentry;
780 /* Debugging tunables and exported data */
781 u64 btrfs_debugfs_test;
784 * Can be called by the device discovery thread.
785 * And parent can be specified for seed device
787 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
788 struct kobject *parent)
792 init_completion(&fs_devs->kobj_unregister);
793 fs_devs->fsid_kobj.kset = btrfs_kset;
794 error = kobject_init_and_add(&fs_devs->fsid_kobj,
795 &btrfs_ktype, parent, "%pU", fs_devs->fsid);
799 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
802 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
803 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
805 btrfs_set_fs_info_ptr(fs_info);
807 error = btrfs_sysfs_add_device_link(fs_devs, NULL);
811 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
813 btrfs_sysfs_rm_device_link(fs_devs, NULL);
817 error = sysfs_create_group(fsid_kobj,
818 &btrfs_feature_attr_group);
822 error = addrm_unknown_feature_attrs(fs_info, true);
826 fs_info->space_info_kobj = kobject_create_and_add("allocation",
828 if (!fs_info->space_info_kobj) {
833 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
839 btrfs_sysfs_remove_mounted(fs_info);
845 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
846 * values in superblock. Call after any changes to incompat/compat_ro flags
848 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
849 u64 bit, enum btrfs_feature_set set)
851 struct btrfs_fs_devices *fs_devs;
852 struct kobject *fsid_kobj;
859 features = get_features(fs_info, set);
860 ASSERT(bit & supported_feature_masks[set]);
862 fs_devs = fs_info->fs_devices;
863 fsid_kobj = &fs_devs->fsid_kobj;
865 if (!fsid_kobj->state_initialized)
869 * FIXME: this is too heavy to update just one value, ideally we'd like
870 * to use sysfs_update_group but some refactoring is needed first.
872 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
873 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
876 static int btrfs_init_debugfs(void)
878 #ifdef CONFIG_DEBUG_FS
879 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
880 if (!btrfs_debugfs_root_dentry)
884 * Example code, how to export data through debugfs.
886 * file: /sys/kernel/debug/btrfs/test
887 * contents of: btrfs_debugfs_test
889 #ifdef CONFIG_BTRFS_DEBUG
890 debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry,
891 &btrfs_debugfs_test);
898 int __init btrfs_init_sysfs(void)
902 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
906 ret = btrfs_init_debugfs();
910 init_feature_attrs();
911 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
917 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
919 kset_unregister(btrfs_kset);
924 void btrfs_exit_sysfs(void)
926 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
927 kset_unregister(btrfs_kset);
928 debugfs_remove_recursive(btrfs_debugfs_root_dentry);