Comment 3 for bug 259817

The following are the commit comments which explain those changes a bit - perhaps it helps:

commit a0553c9d6e8dd6f538f18ae447c45e52f3c40eb6
Author: Theodore Ts'o <tytso@xxxxxx>
Date: Sun Jul 22 22:59:50 2007 -0400

    libext2fs: 32-bit bitmap refactorization, part 1

    Move the 32-bit specific bitmap code into gen_bitmap.c, and the
    high-level interfaces into bitmaps.c. Eventually we'll move the
    new-style bitmap code into gen_bitmap64.c, but first we need to
    isolate the code with knowledge of the bitmap internals in one place
    first.

    In this patch we move allocation, free, copy, clear, set_padding, and
    fudge_end function into gen_bitmap.c, and make sure that the bitmaps.c
    and bitops.c no longer have any knowledge of the bitmap internals.

    Signed-off-by: "Theodore Ts'o" <tytso@xxxxxx>

commit 50448d3dffc66f86592ee0d4b16e4bbe9d08449e
Author: Theodore Ts'o <tytso@xxxxxx>
Date: Sun Jul 22 23:42:14 2007 -0400

    libext2fs: 32-bit bitmap refactorization, part 2

    Move the contents of rs_bitmap.c and cmp_bitmaps.c into gen_bitmap.c
    and bitmaps.c.

    Signed-off-by: "Theodore Ts'o" <tytso@xxxxxx>

commit f1f115a78f5ea599fc5f8815a741d43fedd5840d
Author: Theodore Ts'o <tytso@xxxxxx>
Date: Mon Jul 23 04:32:48 2007 -0400

    libext2fs: 32-bit bitmap refactorization, part 3

    Create new functions ext2fs_{set,get}_{inode,block}_bitmap_range()
    which allow programs like e2fsck, dumpe2fs, etc. to get and set chunks
    of the bitmap at a time.

    Move the representation details of the 32-bit old-style bitmaps into
    gen_bitmap.c.

    Change calls in dumpe2fs, mke2s, et. al to use the new abstractions.

    Signed-off-by: "Theodore Ts'o" <tytso@xxxxxx>