This patch introduces new bitmap interface for ext4 filesystems which 
uses the new type blk64_t.

  bitmaps.c |  156 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
  bitops.c  |   36 ++++++++++++++
  bitops.h  |   29 +++++++++++
  ext2fs.h  |   25 +++++++++
  4 files changed, 231 insertions(+), 15 deletions(-)