Comment 4 for bug 1535349

Here's an updated patch with proper attribution, and references to the upstream commits. I decided to do a backport of the relevant portions of df.c from vivid as that is already known to work well rather than attempt to follow the endless trail of patches that exist upstream. That being said I did document the commit id's that relate to the areas of code that were used in the dep3 header.

I would now appreciate some review and sponsorship of this patch.