2007/416 NFSv4 Mirror-mounts

[Nicolas Williams]

On Wed, Jul 18, 2007 at 10:32:28AM -0500, Tom Haynes wrote:
> Nicolas Williams wrote:
> >So, no mirror mounts in /net?!  Please say it ain't so :(
> 
> It ain't so.

Excellent, thanks.

> I think the intent here is that if you have a choice over an automount 
> or a mirror mount, we take the
> automount.
> 
> But if there is no automount entry and there is a chance to mirror 
> mount, then we will of course
> mirror mount.

So what was intended is that where there are _explicit_ automount
entries they override mirror mounts.  The -hosts automount map lacks
explicit entries, therefore for NFSv4 mounts mirror mounts always
supercede the v3-centric MOUNT protocol-driven scheme.

One more question, suppose I have an entry like:

foo / someserver:/pool/foo /bar someserver:/tank/bar

and there are further server-side mounts on /pool/foo/baz and
/tank/bar/abc, THEN by the principle of least surprise I'd expect:

 - the automount entry is authoritative for the <autofs path>/foo/bar
   mount-point (hiding whatever is actually in /pool/foo/bar on the
   server),

but

 - mirror mounts are still performed for <autofs path>/foo/baz and
   <autofs path>/foo/bar/abc

Is it so?

Nico
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