[lvm-devel] [PATCH lvconvert 4/6] Change lvcreate to use the new mirror APIs

[Jun'ichi Nomura]

Change lvconvert to use add_mirror_images().

The patch simplifies the lvcreate code and we no longer need
to export allocate_extents() directly to tools.

However, this patch slightly changes the allocation logic.
Original code allocated all mirrors at once.
OTOH, this code creates a linear LV first then adds mirrors to it.
It's better to allocate all at once because otherwise the allocation
code may make worse choice at the first attempt.
To do that, we have to be able to create an empty mirror layers.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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