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| author | David Sterba <dsterba@suse.com> | 2016-01-21 18:50:40 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-01-21 18:50:40 +0100 |
| commit | 444e75169872f668eb890f19ec1f32dfc632e704 (patch) | |
| tree | fcc120a9b3ec12c3398908b9bb4491ef6cb3f603 | |
| parent | 3b5bb73bd88d1d90163c91e7cad50b12725dbb1c (diff) | |
| download | linux-444e75169872f668eb890f19ec1f32dfc632e704.tar.gz linux-444e75169872f668eb890f19ec1f32dfc632e704.tar.bz2 linux-444e75169872f668eb890f19ec1f32dfc632e704.zip | |
btrfs: sysfs: introduce helper for syncing bits with sysfs files
The files under /sys/fs/UUID/features get out of sync with the actual
incompat bits set for the filesystem if they change after mount. We're
going to sync them and need a helper to do that.
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/sysfs.c | 30 | ||||
| -rw-r--r-- | fs/btrfs/sysfs.h | 3 |
2 files changed, 33 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 906f7ed6fc80..6986886243bf 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -782,6 +782,36 @@ failure: 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; + + /* + * 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 diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h index 72408e2c4ea8..d7da1a4c2f6c 100644 --- a/fs/btrfs/sysfs.h +++ b/fs/btrfs/sysfs.h @@ -90,4 +90,7 @@ int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, struct kobject *parent); int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs); void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs); +void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, + u64 bit, enum btrfs_feature_set set); + #endif /* _BTRFS_SYSFS_H_ */ |