#unconditional
#val_type uint64_t
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID
BTRFS_FEATURE_COMPAT_RO_VERITY
BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE