On Fri, Jun 10, 2005 at 10:32:04AM +0800, David Adam wrote:
> (The mail to this node is rather slow, so I'm sure someone else will have
> replied by now.)
> 
> On Fri, 10 Jun 2005, Jean-Yves Lefort wrote:
> > Filesystem                             Size    Used   Avail Capacity  
> > Mounted on
> > /dev/ad0s1e                            989M    -46M    956M    -5%    
> > /var/tmp
> >
> > Any hints?
> 
> Yep: delete some files on /var/tmp. :-)
> 
> If you're asking 'how can I have negative disk space?', you might want to
> read newfs(8) and tunefs(8), particularly the sections dealing with the
> -m flag.

Look closer :-)

In comment to the original question: when unmounting filesystems on
5.x and 6.x which have had a lot of activity I commonly see status
messages about negative number of files/blocks being used:

ffs_vfsops.c:           printf("%s: unmount pending error: blocks %jd files 
%d\n",

Kris

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