Function extract_disk_access 

pub fn extract_disk_access<T>(
    value: Result<T>,
    path: &Path,
) -> Result<Option<T>>

Converts a disk access Result<T> into a Result<Some<T>>, where a ErrorKind::NotFound (or ErrorKind::InvalidFilename) error results in a None value. This is purely to reduce boilerplate code comparing ErrorKind::NotFound errors against all other errors.