Date: Tue, 17 Apr 2001 12:58:38 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Matt Dillon <dillon@earth.backplane.com>, Kirk McKusick <mckusick@mckusick.com>, Julian Elischer <julian@elischer.org>, Rik van Riel <riel@conectiva.com.br>, freebsd-hackers@FreeBSD.ORG, David Xu <bsddiy@21cn.com> Subject: Re: vm balance Message-ID: <20010417125838.J976@fw.wintelcom.net> In-Reply-To: <24891.987530101@critter>; from phk@critter.freebsd.dk on Tue, Apr 17, 2001 at 07:55:01PM %2B0200 References: <200104171745.f3HHj2K95255@earth.backplane.com> <24891.987530101@critter>
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* Poul-Henning Kamp <phk@critter.freebsd.dk> [010417 10:56] wrote:
> In message <200104171745.f3HHj2K95255@earth.backplane.com>, Matt Dillon writes:
> >:> I don't think NFS relies on vnodes never being freed.
> >:
> >:It does, in some case nfs stashes a vnode pointer and the v_id
> >:value away, and some time later tries to use that pair to try to
> >:refind the vnode again. If you free vnodes, it will still think
> >:the pointer is a vnode and if junk happens to be right it will
> >:think it is still a vnode. QED: Bad things (TM) will happen.
> >:
> >:# cd /sys/nfs
> >:# grep v_id *
> >:nfs_nqlease.c: vpid = vp->v_id;
> >:nfs_nqlease.c: if (vpid == vp->v_id) {
> >:nfs_nqlease.c: if (vpid == vp->v_id &&
> >:nfs_vnops.c: vpid = newvp->v_id;
> >:nfs_vnops.c: if (vpid == newvp->v_id) {
> >:
> >:--
> >:Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> >
> > hahahahahahahaha.. Look at the code more closely. v_id is not
> > managed by NFS, it's managed by vfs_cache.c. There's a big XXX
> > comment just before cache_purge() that explains it. Believe me,
> > NFS is the least of your worries here.
>
> Matt, you try to free vnodes back to the malloc pool and you will
> see what happens OK ?
I thought vnodes were in stable storage?
Note that I really don't care for using stable storeage as a hack
to deal with this sort of thing.
--
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
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