SpaceUsed
ACPI_SIZE *SpaceUsed);
ACPI_SIZE *SpaceUsed)
*SpaceUsed = Info.Length;
UINT32 *SpaceUsed);
return fVolume->BlockSize() - SpaceUsed() - sizeof(btrfs_header);
if (length < 0 && abs(length) >= SpaceUsed())
int SpaceUsed() const;