def usage(args=None):
    '''
    Return usage information for volumes mounted on this minion

    .. versionchanged:: 2019.2.0

        Default for SunOS changed to 1 kilobyte blocks

    CLI Example:

    .. code-block:: bash

        salt '*' disk.usage
    '''
    flags = _clean_flags(args, 'disk.usage')
    if not os.path.isfile('/etc/mtab') and __grains__['kernel'] == 'Linux':
        log.error('df cannot run without /etc/mtab')
        if __grains__.get('virtual_subtype') == 'LXC':
            log.error('df command failed and LXC detected. If you are running '
                     'a Docker container, consider linking /proc/mounts to '
                     '/etc/mtab or consider running Docker with -privileged')
        return {}
    if __grains__['kernel'] == 'Linux':
        cmd = 'df -P'
    elif __grains__['kernel'] == 'OpenBSD' or __grains__['kernel'] == 'AIX':
        cmd = 'df -kP'
    elif __grains__['kernel'] == 'SunOS':
        cmd = 'df -k'
    else:
        cmd = 'df'
    if flags:
        cmd += ' -{0}'.format(flags)
    ret = {}
    out = __salt__['cmd.run'](cmd, python_shell=False).splitlines()
    oldline = None
    for line in out:
        if not line:
            continue
        if line.startswith('Filesystem'):
            continue
        if oldline:
            line = oldline + " " + line
        comps = line.split()
        if len(comps) == 1:
            oldline = line
            continue
        else:
            oldline = None
        while len(comps) >= 2 and not comps[1].isdigit():
            comps[0] = '{0} {1}'.format(comps[0], comps[1])
            comps.pop(1)
        if len(comps) < 2:
            continue
        try:
            if __grains__['kernel'] == 'Darwin':
                ret[comps[8]] = {
                        'filesystem': comps[0],
                        '512-blocks': comps[1],
                        'used': comps[2],
                        'available': comps[3],
                        'capacity': comps[4],
                        'iused': comps[5],
                        'ifree': comps[6],
                        '%iused': comps[7],
                }
            else:
                ret[comps[5]] = {
                        'filesystem': comps[0],
                        '1K-blocks': comps[1],
                        'used': comps[2],
                        'available': comps[3],
                        'capacity': comps[4],
                }
        except IndexError:
            log.error('Problem parsing disk usage information')
            ret = {}
    return ret