subset detection

[Phillip Susi]

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I'm trying to detect if a given raid_set is a subset or a main set.  It
looks like raid_set->sets is a list_head that serves both as the list
head of a master set, and simultaneously as the next/prev sibling for
sub sets.  Because of this, list_empty() is true for both an independent
raid_set, and also for the subset of a master/subset pair, so you can't
tell the difference, right?  So how can you tell if a given raid_set is
a subset of another, or an independent one?
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