Re: [PATCH] NFS: add mount options 'v4.0' and 'v4.1'

[Steve Dickson <SteveD@redhat.com>]

On 02/07/2012 01:48 PM, Myklebust, Trond wrote:
> On Tue, 2012-02-07 at 13:41 -0500, Trond Myklebust wrote:
>> That said, I see the 'vers=4' being reserved for auto-negotiation of
>> minor version, and the 'vers=4.x' as requiring a specific minor version
>> number.
>> The way auto-negotiation is supposed to work is laid out in
>> RFC3530(-bis): the client attempts the largest minor version that it
>> supports, and the server replies with an OK, or a MINOR_VERSION_MISMATCH
>> depending on whether it supports that minor version or not. If not, the
>> client retries with the next largest minor version, .... rince, repeat
>> until successful...
> 
> BTW: There is no reason why we should need to do this auto-negotiation
> in kernel space. As we've learned with major version negotiation, it can
> be more flexible to just teach the 'mount' command to do the actual
> probing, since that allows the user better control over the process via
> global configuration files...
> 
+1 

Its also much easier to debug and fix bugs... People are much more willing
to take a mount command update than a kernel update...  

steved.