IoVolumeDeviceToDosName allocates the string buffer pointed to by the Buffer member of the UNICODE_STRING structure that the DosName parameter points to. After this buffer is no longer required, a caller of this routine should call the ExFreePool routine to free the buffer.
Starting with Windows Vista, you must ensure that APCs are not disabled before calling this routine. The KeAreAllApcsDisabled routine can be used to verify that APCs are not disabled.
