[PATCH LVM2] (1/12) add flattened index to _for_each_pv()

[Jun'ichi Nomura <j-nomura@ce.jp.nec.com>]

This patch adds "flattened index" to _for_each_pv().

o Using this index, you can map the stacked LV segment into
  the array of PVs.
  This is useful for allocation code to find index of areas[]
  corresponding to the prev_lvseg.

o _for_each_pv() doesn't execute call back function if it's NULL.
  It's useful if you just need to count the number of PVs.
  (_count_parallel_areas).

o The patch adds "start_index" and "end_index" to restrict
  the function call back while maintaining the flattened index.

o Also the patch adds "walk_log_lv" flag instead of reusing
  !only_single_area_segments as workaround, because it is no
  longer correct.


$ diffstat -p1 01.for_each_pv.patch
 lib/metadata/lv_manip.c |   76 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 57 insertions(+), 19 deletions(-)


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


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