Re: [uml-user] can not export a hostfs-directory via nfs

[J. B. F. <bf...@fi...>]

On Fri, Jan 30, 2004 at 11:40:50AM -0500, Jeff Dike wrote:
> On Wed, Jan 28, 2004 at 07:49:33PM +0100, Matthias Meyer wrote:
> > On another node named "server" I try to mount the exported directory:
> > mount -t nfs VirtualServer:/Backup /mnt/VROM2
> > mount: VirtualServer:/Backup failed, reason given by server: Permission
> > denied
> > 
> > On VirtualServer:/var/log/messages I can see:
> > VirtualServer rpc.mountd: authenticated mount request from
> > server.privatelan.at:664 for /Backup (/Backup)
> > VirtualServer rpc.mountd: getfh failed: Operation not permitted
> > 
> > It is not possible to export a hostfs directory via nfs?
> 
> It should be.

NFS exportability isn't automatic; note that you need to define the
s_export_op superblock field at a minimum.  And you need to have some
way of encoding filehandles that makes it easy to find the inodes they
refer to when the client sends them back to you.  This is likely to be
highly non-trivial in the case of hostfs, because the underlying
filesystems it exports can be so different.

--Bruce Fields