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由 NeilBrown 提交于
When RAID10 supports reshape it will need a 'previous' and a 'current' geometry, so introduce that here. Use the 'prev' geometry when before the reshape_position, and the current 'geo' when beyond it. At other times, use both as appropriate. For now, both are identical (And reshape_position is never set). When we use the 'prev' geometry, we must use the old data_offset. When we use the current (And a reshape is happening) we must use the new_data_offset. Signed-off-by: NNeilBrown <neilb@suse.de>
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