On Tue Sep 11 2007 at 19:32:57 +0200, Zafer Aydogan wrote:
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> > Ah, ok, I found the problem.  The real problem, I guess, is that devi=
ce
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> > nodes on layered file systems don't appear to really work.
> >
> > When a layered vnode is initialized, it has a special specinfo struct=
ure
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> > allocated for it.  The specmountpoint field, which is causing EBUSY
> > to be returned, is uninitialized memory (deadbeef on a debug kernel),
> > so this is clearly wrong.  If I initialize it to NULL to allow mount =
to
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> > proceed, I get a panic at unmount for dangling buffers.
> >
> > Another point is that layered vnodes don't appear to be considered
> > aliases, although I think they should; at least in the sense that the=
y
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> > should share specinfo with all the other nodes in the stack.
> >
> > All this needs a bit more than my next 5min timeslice.  For now the b=
est
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> > solution is to not null-mount /dev and e.g. mount a second tmpfs for =
it.
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> >
> Excellent. Not null mounting /dev solved all problems.
> I will release a new version with this fix and send a patch to xtraeme.

Cool!  Please file a PR about the layerfs problem.  I don't have time
to deal with the issue in the coming days.

--=20
Antti Kantee <pooka@iki.fi>                     Of course he runs NetBSD
http://www.iki.fi/pooka/                          http://www.NetBSD.org/
    "la qualit=E9 la plus indispensable du cuisinier est l'exactitude"