NFSv2 boot & OLD_NFSV2

[Toomas Soome]

> On 20. märts 2017, at 23:53, Rick Macklem <rmacklem at uoguelph.ca> wrote:
> 
> Baptiste Daroussin wrote:
>> On Mon, Mar 20, 2017 at 08:22:12PM +0200, Toomas Soome wrote:
>>> Hi!
>>> 
>>> The current boot code is building NFSv3, with preprocessor conditional OLD_NFSV2. Should NFSv2 code still be kept around or can we burn it?
>>> 
>>> rgds,
>>> toomas
>> 
>> I vote burn
>> 
>> Bapt
> I would be happy to see NFSv2 go away. However, depending on how people configure
> their diskless root fs, they do end up using NFSv2 for their root fs.
> 
> Does booting over NFSv3 affect this?
> 
> I think the answer is no for a FreeBSD server (since the NFSv2 File Handle is the same as
> the NFSv3 one, except padded with 0 bytes to 32bytes long).
> However, there might be non-FreeBSD NFS servers where the NFSv2 file handle is different
> than the NFSv3 one and for that case, the user would need NFSv2 boot code (or
> reconfigure their root fs to use NFSv3).
> 
> To be honest, I suspect few realize that they are using NFSv2 for their root fs.
> (They'd see it in a packet trace or via "nfsstat -m", but otherwise they probably
>  think they are using NFSv3 for their root fs.)
> 
> rick

if they do not suspect, they most likely use v3 - due to simple fact that you have to rebuild loader to use NFSv2 - it is compile time option.

rgds,
toomas