Date: Mon, 12 May 2003 07:53:49 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Kirk McKusick <mckusick@beastie.mckusick.com> Cc: Julian Elischer <julian@elischer.org> Subject: Re: large ufs2 partitions and 'df' Message-ID: <3EBFB57D.7376D4A8@mindspring.com> References: <200305112244.h4BMiFTh036221@beastie.mckusick.com>
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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
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