Re: Are there really no server-side mount/umount message for NFSv4?

["Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>]

With NFSv4.1 there are indirect hints to mount/umount: create and
destroy session.

Tigran.

----- Original Message -----
> From: "J. Bruce Fields" <bfields@fieldses.org>
> To: "Frank Steiner" <fsteiner-mail1@bio.ifi.lmu.de>
> Cc: linux-nfs@vger.kernel.org
> Sent: Tuesday, July 21, 2015 6:03:38 PM
> Subject: Re: Are there really no server-side mount/umount message for NFSv4?

> On Tue, Jul 21, 2015 at 03:57:26PM +0200, Frank Steiner wrote:
>> we are missing the "authenticated u/mount request..." messages or
>> error messages like "refused mount request from /x (/): not exported"
>> for NFSv4 servers. We were using the mount/umount messages e.g. to
>> detect when some reached a certain point of an installation etc.
>> And the error messages on the server side often were more helpful
>> than the ones on the client.
>> 
>> Is there really no way to get these easy-to-understand messages?
>> Debugging shows a lot but nothing that e.g. gives an understandable
>> error reason.
> 
> There aren't any mount or umount calls in the NFSv4 protocol.
> 
> (For example, an NFSv4 server typically wouldn't have any way to tell
> the difference between a client that has unmounted and one that just
> isn't using the filesystem right now.)
> 
> If you could describe in more detail your use case, someone might be
> able to suggest a different solution.  Or it might influence what sort
> of information the nfs server exports to users in the future.
> 
> --b.
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