Re: NFSv4 to be a default on RHEL-6

[Ian Kent <ikent@redhat.com>]

On Wed, 2010-12-08 at 13:51 +0100, Ondrej Valousek wrote:
> On 08.12.2010 13:36, Ian Kent wrote: 
> > The default should be determined by mount.nfs(8) since that's what
> > autofs uses to perform mounts.
> I see, but it works only if the nfs4 root export is the same as /. It
> does not work otherwise. Example:
> Server 'dorado' exporting directory /exports which is also fsid=0 for
> nfs4.
> There is (also shared) subdirectory 'ext1' in this one. When I do:
> 
> cd /net/dorado/exports/ext1
> 
> ... the export is mounted using NFSv3. Theoretically if I did:
> 
> cd /net/dorado/ext1
> 
> ... I should have the same mounted via NFSv4, right? Unfortunately it
> does not work. But it should because:
> 
> mount dorado:/ext1 /mnt
> 
> works (giving nfs4 mount)....

The only information the hosts map has to go on is the export list
received from the server.

There is no way for autofs to know that /exports is the global root from
the mountd exports information. It only knows that /exports is an export
and neither does it know what NFS version the server may offer for this
mount. That information just isn't available.

As I said, I thought in recent Fedora releases (not sure now when this
should have happened), that

mount <server>:/exports /<some mount point>

and 

mount <server>:/ /<some mount point>

should both work and mount as NFSv4. Correct me if I'm wrong but your
point is that it is mounting as NFSv3 so perhaps we should log a bug and
see what the experts have to say on this.

Ian