Merge "Exclude holes from the block map."

      for line in f:

        fn, ranges_text = line.rstrip().split(None, 1)

        ranges = rangelib.RangeSet.parse(ranges_text)

        # Note: e2fsdroid records holes in the extent tree as "0" blocks.

        # This causes confusion because clobbered_blocks always includes

        # the superblock (physical block #0). Since the 0 blocks here do

        # not represent actual physical blocks, remove them from the set.

        ranges = ranges.subtract(rangelib.RangeSet("0"))

        ranges.extra['text_str'] = ranges_text

        if allow_shared_blocks: