[lvm-devel] [RFC LVM2] (4/6) Add 'pvseg' to AREA_LV lv_segment_area

[Jun'ichi Nomura]

Currently, struct lv_segment_area has a union member and
switches by its type (AREA_PV or AREA_LV).

As a preparation for the patch "(6/6) Allow allocation from LV",
where AREA_LV segment may have pv_segment, this patch changes
struct lv_segment_area.

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