nullfs and named pipes.

[Kostik Belousov]

On Thu, Feb 15, 2007 at 03:22:59PM +0000, Josef Karthauser wrote:
> On Thu, Feb 15, 2007 at 02:57:50PM +0100, Jeremie Le Hen wrote:
> > 
> > Note that all processes within a jail can only intefere with processes
> > from another jail or host as if they were on different machines.  This
> > means they can communicate through PF_INET for instance but not
> > PF_LOCAL.
> > 
> 
> You might think so!  However that's not what's going on here.
> 
> The named pipe/nullfs issue is nothing to do with jails.  It's just
> that nullfs is broken with respect to named pipes as I've previously
> reported.  However with this patch:
> 
>     cvs diff: Diffing .
>     Index: null_subr.c
>     ===================================================================
>     RCS file: /home/ncvs/src/sys/fs/nullfs/null_subr.c,v
>     retrieving revision 1.48.2.1
>     diff -u -r1.48.2.1 null_subr.c
>     --- null_subr.c 13 Mar 2006 03:05:17 -0000      1.48.2.1
>     +++ null_subr.c 14 Feb 2007 00:02:28 -0000
>     @@ -235,6 +235,8 @@
> 	    xp->null_vnode = vp;
> 	    xp->null_lowervp = lowervp;
> 	    vp->v_type = lowervp->v_type;
>     +       if (vp->v_type == VSOCK || vp->v_type == VFIFO)
>     +               vp->v_un = lowervp->v_un;
I'm wondering is some reference counting needed there ?
> 	    vp->v_data = xp;
> 	    vp->v_vnlock = lowervp->v_vnlock;
> 	    if (vp->v_vnlock == NULL)
> 
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