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Date: Wed, 14 Jan 2009 19:04:23 -0500
From: "Dylan Cochran" <heliocentric@gmail.com>
To: "=?ISO-8859-1?Q?V=E1clav_Haisman?=" <v.haisman@sh.cvut.cz>
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References: <496E282A.5070004@sh.cvut.cz>
Cc: freebsd-stable@freebsd.org
Subject: Re: Mounting / using /dev/ufs/name
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On Wed, Jan 14, 2009 at 1:00 PM, V=E1clav Haisman <v.haisman@sh.cvut.cz> wr=
ote:
> Hi,
> I tried to mount root slice using the device nodes provided in /dev/ufs
> directory. It works fine for other slices but not for the root slice. If =
I
> try it I get prompt asking for root slice at boot time. It this not possi=
ble
> at all or am I doing something wrong?

You should add vfs.root.mountfrom=3D"ufs:ufs/whatever" to /boot/loader.conf

This will short circuit the bootloader's attempts to resolve it from
the rootdev:/etc/fstab entry for /, which, occasionally, will be
unable to deal with an fstab with an otherwise legal ufs label. I
noticed it a few years ago when I moved every machine I had to using
geom_label to find the root device, but I was unable to find the
source of the bug in the code (src/sys/boot/common/boot.c, the
getrootmount routine).