Re: [PATCH] mount: make sure mount correctly when kernel not support NFSv4

[Mi Jinlong <mijinlong@cn.fujitsu.com>]

Chuck Lever :
> On Nov 25, 2010, at 12:54 AM, Mi Jinlong wrote:
> 
>> When user's nfs client(kernel) don't support NFSv4, maybe they build
>> kernel without NFSv4, there is a problem.
>>
>> When using command "mount SERVER-IP:/nfsv3 /mnt/" to mount NFSv3
>> filesystem, mount will fail and get error:
>>
>> "mount.nfs: an incorrect mount option was specified"
>>
>> as above, the mount should success, but it fail.
>>
>> When the mount command without specific NFS version, nfs-utils will
>> try to mount NFSv4 at first, but the kernel don't support, the kernel
>> will return with error EINVAL for parsing option (vers=4) fail.
> 
> Maybe the kernel should return EOPNOTSUPP in that case?

  Yes, what about the following patch.

--
thanks
Mi Jinlong
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