spaced surfaces disk usage information via a D-Bus interface. Currently, spaced supports the following interfaces:
- Method GetTotalDiskSpace: Gets the total disk space available for usage on the device for a given path (including currently used space).
- Method GetFreeDiskSpace: Gets the available free space for use on the device for a given path.
Those D-Bus methods must be preferred over local library calls / syscalls such
as base::SysInfo::AmountOfFreeDiskSpace because spaced's takes the underlying
thinpool into account, for example.