Making the UUID more informative

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I have been trying to get dmraid to alter the UUID of the devices it creates so that the rest of the system can use that information to differentiate between the different types of devices.  My goal is to make sure that things like kpartx are not run each individual half of a raid10.  I thought I could patch dmraid_uuid() to use "DMRAIDI-" as the prefix instead of "DMRAID-" for internal devices, but I have not been able to find a way to tell whether a given raid_set is itself a subset of another set.  I thought that doing a find_set to see if this set's name can be found in the top level would do it, but find_set always fails to find the set, even when it is the top of the stack.

Any suggestions?
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