What's wrong with tmpfs?

[Rob Landley <rob@landley.net>]

Under User Mode Linux in 2.6.14, would someone please explain to me why this 
test:

static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
{
        int err;

        if (mnt->mnt_sb->s_flags & MS_NOUSER)
                return -EINVAL;

Is triggering when I try to mount tmpfs?  Is this happening for anybody else?  
Shouldn't I be getting a fresh superblock or something?  (Is this just a User 
Mode Linux issue?  Haven't got a spare box set up to boot it on real hardware 
just yet...)

If somebody needs a reproduction sequence, I'm happy to oblige.  In theory 
"mount -t tmpfs /mnt /mnt" should do it, but if it was _that_ simple it 
wouldn't have shipped...

Rob
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