fs

type File interface {
	io.Reader
	io.Writer
	io.Closer
	Name() string
	Size() int64
	Sync() error
}

type Filesystem interface {
	Create(path string) (File, error)
	Open(path string) (File, error)
	Remove(path string) error
	Rename(oldname, newname string) error
	Exists(path string) bool
	MkdirAll(path string) error
	Chtimes(path string, atime, mtime time.Time) error
	Walk(root string, walkFn filepath.WalkFunc) error
	Lock(path string) (r Releaser, existed bool, err error)
}

type Releaser interface {
	Release() error
}