| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/kobject.h> |
| #include <linux/bug.h> |
| #include <linux/debugfs.h> |
| |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "sysfs.h" |
| #include "volumes.h" |
| |
| static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
| static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
| |
| static u64 get_features(struct btrfs_fs_info *fs_info, |
| enum btrfs_feature_set set) |
| { |
| struct btrfs_super_block *disk_super = fs_info->super_copy; |
| if (set == FEAT_COMPAT) |
| return btrfs_super_compat_flags(disk_super); |
| else if (set == FEAT_COMPAT_RO) |
| return btrfs_super_compat_ro_flags(disk_super); |
| else |
| return btrfs_super_incompat_flags(disk_super); |
| } |
| |
| static void set_features(struct btrfs_fs_info *fs_info, |
| enum btrfs_feature_set set, u64 features) |
| { |
| struct btrfs_super_block *disk_super = fs_info->super_copy; |
| if (set == FEAT_COMPAT) |
| btrfs_set_super_compat_flags(disk_super, features); |
| else if (set == FEAT_COMPAT_RO) |
| btrfs_set_super_compat_ro_flags(disk_super, features); |
| else |
| btrfs_set_super_incompat_flags(disk_super, features); |
| } |
| |
| static int can_modify_feature(struct btrfs_feature_attr *fa) |
| { |
| int val = 0; |
| u64 set, clear; |
| switch (fa->feature_set) { |
| case FEAT_COMPAT: |
| set = BTRFS_FEATURE_COMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; |
| break; |
| case FEAT_COMPAT_RO: |
| set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; |
| break; |
| case FEAT_INCOMPAT: |
| set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
| break; |
| default: |
| pr_warn("btrfs: sysfs: unknown feature set %d\n", |
| fa->feature_set); |
| return 0; |
| } |
| |
| if (set & fa->feature_bit) |
| val |= 1; |
| if (clear & fa->feature_bit) |
| val |= 2; |
| |
| return val; |
| } |
| |
| static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| int val = 0; |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
| if (fs_info) { |
| u64 features = get_features(fs_info, fa->feature_set); |
| if (features & fa->feature_bit) |
| val = 1; |
| } else |
| val = can_modify_feature(fa); |
| |
| return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| } |
| |
| static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t count) |
| { |
| struct btrfs_fs_info *fs_info; |
| struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
| u64 features, set, clear; |
| unsigned long val; |
| int ret; |
| |
| fs_info = to_fs_info(kobj); |
| if (!fs_info) |
| return -EPERM; |
| |
| if (sb_rdonly(fs_info->sb)) |
| return -EROFS; |
| |
| ret = kstrtoul(skip_spaces(buf), 0, &val); |
| if (ret) |
| return ret; |
| |
| if (fa->feature_set == FEAT_COMPAT) { |
| set = BTRFS_FEATURE_COMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; |
| } else if (fa->feature_set == FEAT_COMPAT_RO) { |
| set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; |
| } else { |
| set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
| } |
| |
| features = get_features(fs_info, fa->feature_set); |
| |
| /* Nothing to do */ |
| if ((val && (features & fa->feature_bit)) || |
| (!val && !(features & fa->feature_bit))) |
| return count; |
| |
| if ((val && !(set & fa->feature_bit)) || |
| (!val && !(clear & fa->feature_bit))) { |
| btrfs_info(fs_info, |
| "%sabling feature %s on mounted fs is not supported.", |
| val ? "En" : "Dis", fa->kobj_attr.attr.name); |
| return -EPERM; |
| } |
| |
| btrfs_info(fs_info, "%s %s feature flag", |
| val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); |
| |
| spin_lock(&fs_info->super_lock); |
| features = get_features(fs_info, fa->feature_set); |
| if (val) |
| features |= fa->feature_bit; |
| else |
| features &= ~fa->feature_bit; |
| set_features(fs_info, fa->feature_set, features); |
| spin_unlock(&fs_info->super_lock); |
| |
| /* |
| * We don't want to do full transaction commit from inside sysfs |
| */ |
| btrfs_set_pending(fs_info, COMMIT); |
| wake_up_process(fs_info->transaction_kthread); |
| |
| return count; |
| } |
| |
| static umode_t btrfs_feature_visible(struct kobject *kobj, |
| struct attribute *attr, int unused) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| umode_t mode = attr->mode; |
| |
| if (fs_info) { |
| struct btrfs_feature_attr *fa; |
| u64 features; |
| |
| fa = attr_to_btrfs_feature_attr(attr); |
| features = get_features(fs_info, fa->feature_set); |
| |
| if (can_modify_feature(fa)) |
| mode |= S_IWUSR; |
| else if (!(features & fa->feature_bit)) |
| mode = 0; |
| } |
| |
| return mode; |
| } |
| |
| BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); |
| BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); |
| BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); |
| BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); |
| BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
| BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
| BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); |
| BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); |
| BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); |
| BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
| BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); |
| BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
| |
| static struct attribute *btrfs_supported_feature_attrs[] = { |
| BTRFS_FEAT_ATTR_PTR(mixed_backref), |
| BTRFS_FEAT_ATTR_PTR(default_subvol), |
| BTRFS_FEAT_ATTR_PTR(mixed_groups), |
| BTRFS_FEAT_ATTR_PTR(compress_lzo), |
| BTRFS_FEAT_ATTR_PTR(compress_zstd), |
| BTRFS_FEAT_ATTR_PTR(big_metadata), |
| BTRFS_FEAT_ATTR_PTR(extended_iref), |
| BTRFS_FEAT_ATTR_PTR(raid56), |
| BTRFS_FEAT_ATTR_PTR(skinny_metadata), |
| BTRFS_FEAT_ATTR_PTR(no_holes), |
| BTRFS_FEAT_ATTR_PTR(metadata_uuid), |
| BTRFS_FEAT_ATTR_PTR(free_space_tree), |
| NULL |
| }; |
| |
| /* |
| * Features which depend on feature bits and may differ between each fs. |
| * |
| * /sys/fs/btrfs/features lists all available features of this kernel while |
| * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or |
| * can be changed online. |
| */ |
| static const struct attribute_group btrfs_feature_attr_group = { |
| .name = "features", |
| .is_visible = btrfs_feature_visible, |
| .attrs = btrfs_supported_feature_attrs, |
| }; |
| |
| static ssize_t rmdir_subvol_show(struct kobject *kobj, |
| struct kobj_attribute *ka, char *buf) |
| { |
| return snprintf(buf, PAGE_SIZE, "0\n"); |
| } |
| BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); |
| |
| static struct attribute *btrfs_supported_static_feature_attrs[] = { |
| BTRFS_ATTR_PTR(static_feature, rmdir_subvol), |
| NULL |
| }; |
| |
| /* |
| * Features which only depend on kernel version. |
| * |
| * These are listed in /sys/fs/btrfs/features along with |
| * btrfs_feature_attr_group |
| */ |
| static const struct attribute_group btrfs_static_feature_attr_group = { |
| .name = "features", |
| .attrs = btrfs_supported_static_feature_attrs, |
| }; |
| |
| static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
| { |
| u64 val; |
| if (lock) |
| spin_lock(lock); |
| val = *value_ptr; |
| if (lock) |
| spin_unlock(lock); |
| return snprintf(buf, PAGE_SIZE, "%llu\n", val); |
| } |
| |
| static ssize_t global_rsv_size_show(struct kobject *kobj, |
| struct kobj_attribute *ka, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); |
| struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); |
| } |
| BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
| |
| static ssize_t global_rsv_reserved_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); |
| struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); |
| } |
| BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
| |
| #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) |
| #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
| |
| static ssize_t raid_bytes_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf); |
| BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
| BTRFS_ATTR(raid, used_bytes, raid_bytes_show); |
| |
| static ssize_t raid_bytes_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj->parent); |
| struct btrfs_block_group_cache *block_group; |
| int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
| u64 val = 0; |
| |
| down_read(&sinfo->groups_sem); |
| list_for_each_entry(block_group, &sinfo->block_groups[index], list) { |
| if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
| val += block_group->key.offset; |
| else |
| val += btrfs_block_group_used(&block_group->item); |
| } |
| up_read(&sinfo->groups_sem); |
| return snprintf(buf, PAGE_SIZE, "%llu\n", val); |
| } |
| |
| static struct attribute *raid_attributes[] = { |
| BTRFS_ATTR_PTR(raid, total_bytes), |
| BTRFS_ATTR_PTR(raid, used_bytes), |
| NULL |
| }; |
| |
| static void release_raid_kobj(struct kobject *kobj) |
| { |
| kfree(to_raid_kobj(kobj)); |
| } |
| |
| struct kobj_type btrfs_raid_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = release_raid_kobj, |
| .default_attrs = raid_attributes, |
| }; |
| |
| #define SPACE_INFO_ATTR(field) \ |
| static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ |
| struct kobj_attribute *a, \ |
| char *buf) \ |
| { \ |
| struct btrfs_space_info *sinfo = to_space_info(kobj); \ |
| return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ |
| } \ |
| BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
| |
| static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, |
| struct kobj_attribute *a, |
| char *buf) |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj); |
| s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); |
| return snprintf(buf, PAGE_SIZE, "%lld\n", val); |
| } |
| |
| SPACE_INFO_ATTR(flags); |
| SPACE_INFO_ATTR(total_bytes); |
| SPACE_INFO_ATTR(bytes_used); |
| SPACE_INFO_ATTR(bytes_pinned); |
| SPACE_INFO_ATTR(bytes_reserved); |
| SPACE_INFO_ATTR(bytes_may_use); |
| SPACE_INFO_ATTR(bytes_readonly); |
| SPACE_INFO_ATTR(disk_used); |
| SPACE_INFO_ATTR(disk_total); |
| BTRFS_ATTR(space_info, total_bytes_pinned, |
| btrfs_space_info_show_total_bytes_pinned); |
| |
| static struct attribute *space_info_attrs[] = { |
| BTRFS_ATTR_PTR(space_info, flags), |
| BTRFS_ATTR_PTR(space_info, total_bytes), |
| BTRFS_ATTR_PTR(space_info, bytes_used), |
| BTRFS_ATTR_PTR(space_info, bytes_pinned), |
| BTRFS_ATTR_PTR(space_info, bytes_reserved), |
| BTRFS_ATTR_PTR(space_info, bytes_may_use), |
| BTRFS_ATTR_PTR(space_info, bytes_readonly), |
| BTRFS_ATTR_PTR(space_info, disk_used), |
| BTRFS_ATTR_PTR(space_info, disk_total), |
| BTRFS_ATTR_PTR(space_info, total_bytes_pinned), |
| NULL, |
| }; |
| |
| static void space_info_release(struct kobject *kobj) |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj); |
| percpu_counter_destroy(&sinfo->total_bytes_pinned); |
| kfree(sinfo); |
| } |
| |
| struct kobj_type space_info_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = space_info_release, |
| .default_attrs = space_info_attrs, |
| }; |
| |
| static const struct attribute *allocation_attrs[] = { |
| BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
| BTRFS_ATTR_PTR(allocation, global_rsv_size), |
| NULL, |
| }; |
| |
| static ssize_t btrfs_label_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| char *label = fs_info->super_copy->label; |
| ssize_t ret; |
| |
| spin_lock(&fs_info->super_lock); |
| ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); |
| spin_unlock(&fs_info->super_lock); |
| |
| return ret; |
| } |
| |
| static ssize_t btrfs_label_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t len) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| size_t p_len; |
| |
| if (!fs_info) |
| return -EPERM; |
| |
| if (sb_rdonly(fs_info->sb)) |
| return -EROFS; |
| |
| /* |
| * p_len is the len until the first occurrence of either |
| * '\n' or '\0' |
| */ |
| p_len = strcspn(buf, "\n"); |
| |
| if (p_len >= BTRFS_LABEL_SIZE) |
| return -EINVAL; |
| |
| spin_lock(&fs_info->super_lock); |
| memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
| memcpy(fs_info->super_copy->label, buf, p_len); |
| spin_unlock(&fs_info->super_lock); |
| |
| /* |
| * We don't want to do full transaction commit from inside sysfs |
| */ |
| btrfs_set_pending(fs_info, COMMIT); |
| wake_up_process(fs_info->transaction_kthread); |
| |
| return len; |
| } |
| BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
| |
| static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); |
| } |
| |
| BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
| |
| static ssize_t btrfs_sectorsize_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", |
| fs_info->super_copy->sectorsize); |
| } |
| |
| BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
| |
| static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", |
| fs_info->super_copy->sectorsize); |
| } |
| |
| BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
| |
| static ssize_t quota_override_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| int quota_override; |
| |
| quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); |
| return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); |
| } |
| |
| static ssize_t quota_override_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t len) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| unsigned long knob; |
| int err; |
| |
| if (!fs_info) |
| return -EPERM; |
| |
| if (!capable(CAP_SYS_RESOURCE)) |
| return -EPERM; |
| |
| err = kstrtoul(buf, 10, &knob); |
| if (err) |
| return err; |
| if (knob > 1) |
| return -EINVAL; |
| |
| if (knob) |
| set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); |
| else |
| clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); |
| |
| return len; |
| } |
| |
| BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
| |
| static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%pU\n", |
| fs_info->fs_devices->metadata_uuid); |
| } |
| |
| BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); |
| |
| static const struct attribute *btrfs_attrs[] = { |
| BTRFS_ATTR_PTR(, label), |
| BTRFS_ATTR_PTR(, nodesize), |
| BTRFS_ATTR_PTR(, sectorsize), |
| BTRFS_ATTR_PTR(, clone_alignment), |
| BTRFS_ATTR_PTR(, quota_override), |
| BTRFS_ATTR_PTR(, metadata_uuid), |
| NULL, |
| }; |
| |
| static void btrfs_release_fsid_kobj(struct kobject *kobj) |
| { |
| struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
| |
| memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
| complete(&fs_devs->kobj_unregister); |
| } |
| |
| static struct kobj_type btrfs_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = btrfs_release_fsid_kobj, |
| }; |
| |
| static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
| { |
| if (kobj->ktype != &btrfs_ktype) |
| return NULL; |
| return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
| } |
| |
| static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
| { |
| if (kobj->ktype != &btrfs_ktype) |
| return NULL; |
| return to_fs_devs(kobj)->fs_info; |
| } |
| |
| #define NUM_FEATURE_BITS 64 |
| #define BTRFS_FEATURE_NAME_MAX 13 |
| static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; |
| static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; |
| |
| static const u64 supported_feature_masks[FEAT_MAX] = { |
| [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
| [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, |
| [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, |
| }; |
| |
| static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) |
| { |
| int set; |
| |
| for (set = 0; set < FEAT_MAX; set++) { |
| int i; |
| struct attribute *attrs[2]; |
| struct attribute_group agroup = { |
| .name = "features", |
| .attrs = attrs, |
| }; |
| u64 features = get_features(fs_info, set); |
| features &= ~supported_feature_masks[set]; |
| |
| if (!features) |
| continue; |
| |
| attrs[1] = NULL; |
| for (i = 0; i < NUM_FEATURE_BITS; i++) { |
| struct btrfs_feature_attr *fa; |
| |
| if (!(features & (1ULL << i))) |
| continue; |
| |
| fa = &btrfs_feature_attrs[set][i]; |
| attrs[0] = &fa->kobj_attr.attr; |
| if (add) { |
| int ret; |
| ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
| &agroup); |
| if (ret) |
| return ret; |
| } else |
| sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
| &agroup); |
| } |
| |
| } |
| return 0; |
| } |
| |
| static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
| { |
| if (fs_devs->device_dir_kobj) { |
| kobject_del(fs_devs->device_dir_kobj); |
| kobject_put(fs_devs->device_dir_kobj); |
| fs_devs->device_dir_kobj = NULL; |
| } |
| |
| if (fs_devs->fsid_kobj.state_initialized) { |
| kobject_del(&fs_devs->fsid_kobj); |
| kobject_put(&fs_devs->fsid_kobj); |
| wait_for_completion(&fs_devs->kobj_unregister); |
| } |
| } |
| |
| /* when fs_devs is NULL it will remove all fsid kobject */ |
| void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
| { |
| struct list_head *fs_uuids = btrfs_get_fs_uuids(); |
| |
| if (fs_devs) { |
| __btrfs_sysfs_remove_fsid(fs_devs); |
| return; |
| } |
| |
| list_for_each_entry(fs_devs, fs_uuids, fs_list) { |
| __btrfs_sysfs_remove_fsid(fs_devs); |
| } |
| } |
| |
| void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
| { |
| btrfs_reset_fs_info_ptr(fs_info); |
| |
| if (fs_info->space_info_kobj) { |
| sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); |
| kobject_del(fs_info->space_info_kobj); |
| kobject_put(fs_info->space_info_kobj); |
| } |
| addrm_unknown_feature_attrs(fs_info, false); |
| sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); |
| sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); |
| btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
| } |
| |
| const char * const btrfs_feature_set_names[FEAT_MAX] = { |
| [FEAT_COMPAT] = "compat", |
| [FEAT_COMPAT_RO] = "compat_ro", |
| [FEAT_INCOMPAT] = "incompat", |
| }; |
| |
| char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
| { |
| size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ |
| int len = 0; |
| int i; |
| char *str; |
| |
| str = kmalloc(bufsize, GFP_KERNEL); |
| if (!str) |
| return str; |
| |
| for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
| const char *name; |
| |
| if (!(flags & (1ULL << i))) |
| continue; |
| |
| name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; |
| len += snprintf(str + len, bufsize - len, "%s%s", |
| len ? "," : "", name); |
| } |
| |
| return str; |
| } |
| |
| static void init_feature_attrs(void) |
| { |
| struct btrfs_feature_attr *fa; |
| int set, i; |
| |
| BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != |
| ARRAY_SIZE(btrfs_feature_attrs)); |
| BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != |
| ARRAY_SIZE(btrfs_feature_attrs[0])); |
| |
| memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
| memset(btrfs_unknown_feature_names, 0, |
| sizeof(btrfs_unknown_feature_names)); |
| |
| for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
| struct btrfs_feature_attr *sfa; |
| struct attribute *a = btrfs_supported_feature_attrs[i]; |
| int bit; |
| sfa = attr_to_btrfs_feature_attr(a); |
| bit = ilog2(sfa->feature_bit); |
| fa = &btrfs_feature_attrs[sfa->feature_set][bit]; |
| |
| fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; |
| } |
| |
| for (set = 0; set < FEAT_MAX; set++) { |
| for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
| char *name = btrfs_unknown_feature_names[set][i]; |
| fa = &btrfs_feature_attrs[set][i]; |
| |
| if (fa->kobj_attr.attr.name) |
| continue; |
| |
| snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", |
| btrfs_feature_set_names[set], i); |
| |
| fa->kobj_attr.attr.name = name; |
| fa->kobj_attr.attr.mode = S_IRUGO; |
| fa->feature_set = set; |
| fa->feature_bit = 1ULL << i; |
| } |
| } |
| } |
| |
| /* when one_device is NULL, it removes all device links */ |
| |
| int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
| struct btrfs_device *one_device) |
| { |
| struct hd_struct *disk; |
| struct kobject *disk_kobj; |
| |
| if (!fs_devices->device_dir_kobj) |
| return -EINVAL; |
| |
| if (one_device && one_device->bdev) { |
| disk = one_device->bdev->bd_part; |
| disk_kobj = &part_to_dev(disk)->kobj; |
| |
| sysfs_remove_link(fs_devices->device_dir_kobj, |
| disk_kobj->name); |
| } |
| |
| if (one_device) |
| return 0; |
| |
| list_for_each_entry(one_device, |
| &fs_devices->devices, dev_list) { |
| if (!one_device->bdev) |
| continue; |
| disk = one_device->bdev->bd_part; |
| disk_kobj = &part_to_dev(disk)->kobj; |
| |
| sysfs_remove_link(fs_devices->device_dir_kobj, |
| disk_kobj->name); |
| } |
| |
| return 0; |
| } |
| |
| int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) |
| { |
| if (!fs_devs->device_dir_kobj) |
| fs_devs->device_dir_kobj = kobject_create_and_add("devices", |
| &fs_devs->fsid_kobj); |
| |
| if (!fs_devs->device_dir_kobj) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
| struct btrfs_device *one_device) |
| { |
| int error = 0; |
| struct btrfs_device *dev; |
| |
| list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
| struct hd_struct *disk; |
| struct kobject *disk_kobj; |
| |
| if (!dev->bdev) |
| continue; |
| |
| if (one_device && one_device != dev) |
| continue; |
| |
| disk = dev->bdev->bd_part; |
| disk_kobj = &part_to_dev(disk)->kobj; |
| |
| error = sysfs_create_link(fs_devices->device_dir_kobj, |
| disk_kobj, disk_kobj->name); |
| if (error) |
| break; |
| } |
| |
| return error; |
| } |
| |
| /* /sys/fs/btrfs/ entry */ |
| static struct kset *btrfs_kset; |
| |
| /* /sys/kernel/debug/btrfs */ |
| static struct dentry *btrfs_debugfs_root_dentry; |
| |
| /* Debugging tunables and exported data */ |
| u64 btrfs_debugfs_test; |
| |
| /* |
| * Can be called by the device discovery thread. |
| * And parent can be specified for seed device |
| */ |
| int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, |
| struct kobject *parent) |
| { |
| int error; |
| |
| init_completion(&fs_devs->kobj_unregister); |
| fs_devs->fsid_kobj.kset = btrfs_kset; |
| error = kobject_init_and_add(&fs_devs->fsid_kobj, |
| &btrfs_ktype, parent, "%pU", fs_devs->fsid); |
| if (error) { |
| kobject_put(&fs_devs->fsid_kobj); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
| { |
| int error; |
| struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
| struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
| |
| btrfs_set_fs_info_ptr(fs_info); |
| |
| error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
| if (error) |
| return error; |
| |
| error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
| if (error) { |
| btrfs_sysfs_rm_device_link(fs_devs, NULL); |
| return error; |
| } |
| |
| error = sysfs_create_group(fsid_kobj, |
| &btrfs_feature_attr_group); |
| if (error) |
| goto failure; |
| |
| error = addrm_unknown_feature_attrs(fs_info, true); |
| if (error) |
| goto failure; |
| |
| fs_info->space_info_kobj = kobject_create_and_add("allocation", |
| fsid_kobj); |
| if (!fs_info->space_info_kobj) { |
| error = -ENOMEM; |
| goto failure; |
| } |
| |
| error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); |
| if (error) |
| goto failure; |
| |
| return 0; |
| failure: |
| btrfs_sysfs_remove_mounted(fs_info); |
| return error; |
| } |
| |
| |
| /* |
| * Change per-fs features in /sys/fs/btrfs/UUID/features to match current |
| * values in superblock. Call after any changes to incompat/compat_ro flags |
| */ |
| void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, |
| u64 bit, enum btrfs_feature_set set) |
| { |
| struct btrfs_fs_devices *fs_devs; |
| struct kobject *fsid_kobj; |
| u64 features; |
| int ret; |
| |
| if (!fs_info) |
| return; |
| |
| features = get_features(fs_info, set); |
| ASSERT(bit & supported_feature_masks[set]); |
| |
| fs_devs = fs_info->fs_devices; |
| fsid_kobj = &fs_devs->fsid_kobj; |
| |
| if (!fsid_kobj->state_initialized) |
| return; |
| |
| /* |
| * FIXME: this is too heavy to update just one value, ideally we'd like |
| * to use sysfs_update_group but some refactoring is needed first. |
| */ |
| sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); |
| ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); |
| } |
| |
| static int btrfs_init_debugfs(void) |
| { |
| #ifdef CONFIG_DEBUG_FS |
| btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); |
| if (!btrfs_debugfs_root_dentry) |
| return -ENOMEM; |
| |
| /* |
| * Example code, how to export data through debugfs. |
| * |
| * file: /sys/kernel/debug/btrfs/test |
| * contents of: btrfs_debugfs_test |
| */ |
| #ifdef CONFIG_BTRFS_DEBUG |
| debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, |
| &btrfs_debugfs_test); |
| #endif |
| |
| #endif |
| return 0; |
| } |
| |
| int __init btrfs_init_sysfs(void) |
| { |
| int ret; |
| |
| btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
| if (!btrfs_kset) |
| return -ENOMEM; |
| |
| ret = btrfs_init_debugfs(); |
| if (ret) |
| goto out1; |
| |
| init_feature_attrs(); |
| ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
| if (ret) |
| goto out2; |
| ret = sysfs_merge_group(&btrfs_kset->kobj, |
| &btrfs_static_feature_attr_group); |
| if (ret) |
| goto out_remove_group; |
| |
| return 0; |
| |
| out_remove_group: |
| sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
| out2: |
| debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
| out1: |
| kset_unregister(btrfs_kset); |
| |
| return ret; |
| } |
| |
| void __cold btrfs_exit_sysfs(void) |
| { |
| sysfs_unmerge_group(&btrfs_kset->kobj, |
| &btrfs_static_feature_attr_group); |
| sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
| kset_unregister(btrfs_kset); |
| debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
| } |
| |