New g_part class

[Joerg Pernfuss]

On Tue, 06 Feb 2007 10:35:24 +0000
"Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:

> 
> If the geom classes are implemented correctly, you should never
> need to set kern.geom.debugflags.

So in theory, the following should work?

- set up a server with 2 160g sata drives (standard example that i
  hope everyone can relate to)
- gmirror them
- set up one slice covering the whole gmirror
- create a disklabel for example with:
		a	2g	/
		b	4g	swap
		c	voodoo
		d	4g	/tmp
		e	16g	/var
		f	20g	/usr
		g	54g	/jails
  This leaves the h partition and around 56g free for "later usage"
  in case something comes up/happens or g needs to be grown.
- add the 'h' partition later on while the system is running

Because currently this does not work. I am not very fluent in C, but
wouldn't this require a flag to pass down to tell it, it is ok to
modify a bsdlabel from which partitions are mounted, because none
of the mounted ones have been changed? Is there such a mechanism in
place but unused? I haven't stumpled upon any, but I might have easily
missed it.

Regards,
	Joerg

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