Simple wrapper to interface with bcache SysFS

def _fssys(name, value=None, log_lvl=None, log_msg=None):
    '''
    Simple wrapper to interface with bcache SysFS
    '''
    fspath = _fspath()
    if not fspath:
        return False
    else:
        return _sysfs_attr([fspath, name], value, log_lvl, log_msg)