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Subject: Re: [PATCH] manpage: explain why showmount doesn't really work
 against a v4-only server
To:     Jeff Layton <jlayton@kernel.org>
Cc:     linux-nfs@vger.kernel.org, jfajerski@suse.com
References: <20190510215445.1823-1-jlayton@kernel.org>
From:   Steve Dickson <SteveD@RedHat.com>
Message-ID: <cb6af578-63fc-3832-0337-6a109e80dd0d@RedHat.com>
Date:   Mon, 3 Jun 2019 10:27:19 -0400
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On 5/10/19 5:54 PM, Jeff Layton wrote:
> From: Jeff Layton <jlayton@redhat.com>
> 
> I occasionally see people that expect valid info when running showmount
> against a server that may export some or all filesystems via NFSv4.
> Let's make it clear that it only works by talking to the remote MNT
> service, and that that may not be available from a v4-only server.
> 
> Cc: Jan Fajerski <jfajerski@suse.com>
> Signed-off-by: Jeff Layton <jlayton@redhat.com>
Committed... 

steved.

> ---
>  utils/showmount/showmount.man | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/utils/showmount/showmount.man b/utils/showmount/showmount.man
> index a2f510fb5617..35818e1b61c5 100644
> --- a/utils/showmount/showmount.man
> +++ b/utils/showmount/showmount.man
> @@ -56,5 +56,10 @@ Because
>  .B showmount
>  sorts and uniqs the output, it is impossible to determine from
>  the output whether a client is mounting the same directory more than once.
> +.P
> +.B showmount
> +works by contacting the server's MNT service directly. NFSv4-only servers have
> +no need to advertise their exported root filehandles via this method, and may
> +not expose their MNT service to clients.
>  .SH AUTHOR
>  Rick Sladkey <jrs@world.std.com>
> -- 2.21.0
>