large ufs2 partitions and 'df'

[Terry Lambert]

Kirk McKusick wrote:
> Julian Elisher wrote:
> > I think that swithing to a new syscall with a fixed structure
> > and using the rules you mention above to populate the structure in an
> > ostatfs call might be the best answer.
> > Old binaries probably only need to know that there is > X blocks free
> > and not necessarily the correct number.
> > New binaries can use the new syscall.
> 
> So right you are. It would be possible to get the space by nibbling
> a bit more space from MNAMELEN, but at some point we need to just bite
> the bullet and define a new structure. I am leaning towards believing
> that time is now. If we do define a new structure, I would like to
> clean up the existing one a bit. I would propose this:

If you're going to change the structure, please put a version
number as the first field, so that it's never a problem again.

Also, put a spare field on the end (64 bits) to allow for
future expansion that maintains binary compatability (by way
of choice about what to copy in).

-- Terry