[lvm-devel] [PATCH pvmove 1/9] Add insert_layer_for_segments_on_pv()

[Jun'ichi Nomura]

Add insert_layer_for_segments_on_pv().

The function can be used to insert a layer below the LV,
only for the segments on a specified PV.

Part of the code is derived from pvmove.

Changes since rev2:
  * Use move_lv_segment_area() for layer insertion
  * Add error message for insert_layer_for_segments_on_pv()
  * Use PRIu32 instead of "%u"
  * Replace 'stack; return 0;' with 'return_0;'
  * Changed internal function names to more specific ones
      - _extend_layer_lv() -> _extend_layer_lv_for_segment()
      - _seg_pv_match() -> _match_seg_area_to_pe_range()
      - _align_segment_boundary() -> _align_segment_boundary_to_pe_ranges()

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