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

[Poul-Henning Kamp]

In message <20070901093035.GA18069 at harmless.hu>, Gergely CZUCZY writes:

>Though for this, geom class manuals should mention how much
>space do they need for the metadata at the end. Or to simplify
>thing an option for like "reserve some space for (gmirror|gstripe|gfoobar)"
>should be introduced. Or specifing the module and newfs could "ask"
>the geom class for its metadata size that should be reserved.
>Just thinking, sorry if it was too wild...

THe original intent was that you would stick the geom class there
first, then make the filesystem.  Doing things in the other order
is asking for trouble.

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