New option for newfs(3) to make life with GEOM easier

[Ivan Voras]

Bernd Walter wrote:

> Don't get me wrong, I'm not against cutting a few sectors per default,
> just want to have a fallback.

Fallback would be to say "-r 0", presumably.

> However, I would still prefer if users get a warning if they try to
> use a filesystem, which overflows the media.
> I guess the foot-shooting is quite common about this point.

How would the file system overflow the media? The case discussed here is 
shrinking the file system to be a few sectors smaller than the media 
size (i.e. those few sectors would be unused by the fs).

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