Date: Wed, 31 May 2006 16:42:24 -0400 (EDT) From: Jerry McAllister <jerrymc@clunix.cl.msu.edu> To: roberthuff@rcn.com (Robert Huff) Cc: questions@freebsd.org Subject: Re: using bsdlabel Message-ID: <200605312042.k4VKgOSU008664@clunix.cl.msu.edu> In-Reply-To: <17533.61128.28295.514215@jerusalem.litteratus.org>
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>
> I've never used bsdlabel before; would someone please confirm
> I've got this right?
> Status quo:
>
> huff@>> bsdlabel da0s1
> # /dev/da0s1:
> 8 partitions:
> # size offset fstype [fsize bsize bps/cpg]
> a: 1024000 0 4.2BSD 0 0 0
> b: 2097152 1024000 swap
> c: 8916012 0 unused 0 0 # "raw" part, don't edit
> d: 2097152 3121152 4.2BSD 0 0 0
>
> As I understand it, if I run this:
>
> huff@>> bsdlabel -w da0s1 -f /label.new
>
> where /label.new has:
>
> # /dev/da0s1:
> 8 partitions:
> # size offset fstype [fsize bsize bps/cpg]
> a: 1024000 0 4.2BSD 0 0 0
> b: 2097152 1024000 swap
> c: 8916012 0 unused 0 0 # "raw" part, don't edit
> d: 2097152 3121152 4.2BSD 0 0 0
> e: 3697708 5128304 4.2BSD 0 0 0
>
> this will allocate the rest of the slice to partition 'e'.
> (And we're ready to newfs.)
If I am doing it by hand, I would prefer using direct edit as in:
(NOTE, you apparently already have some usable label on the disk)
>> bsdlabel -e -r da0s1
This will bring up an edit session (vi unless you have your editor
set to something else - I use vi)
as follows.
> # /dev/da0s1:
> 8 partitions:
> # size offset fstype [fsize bsize bps/cpg]
> a: 1024000 0 4.2BSD 0 0 0
> b: 2097152 * swap
> c: * 0 unused 0 0 # "raw" part, don't edit
> d: 2097152 * 4.2BSD 0 0 0
> e: * * 4.2BSD 0 0 0
>
Then, just write and quit the edit session
It will calculate the last partition size and all the offsets for you
just the way you want it.
I use this method in our programs that automatically build variable
sized disks for our clients. I fix the size of root (da0s1a), swap (da0s1b)
and tmp (da0s1e) and then make the last partition (da0s1f) contain all the
remainder, whatever it is. It works just fine.
If you really want to work from a file, put the output of your bsdlabel
into the file and then edit it as I show above.
bsdlabel -r da0s1 >> label.new
vi label.new
Then do:
disklabel -R da0s1 label.new
The only thing you aren't doing in either of these cases is making
that da0s1a bootable. If you want that, you need to do:
either
bsdlabel -B da0s1
bsdlabel -r -e and then do the edits as above
or to do it from a file as created above do:
disklabel -R -B da0s1 label.new
////jerry
>
> Robert Huff
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