[pnfs] sequence xdr fix

[Trond Myklebust]

On Wed, 2007-10-03 at 14:52 -0700, dean hildebrand wrote:
> Here is a quick patch which removes duplicate sequence xdr allocations
> from all operations using sessions.  With this patch, our read
> performance increases 10x since the data doesn't need to be copied on
> the client after it is received.
> 
> This is something we can talk about at the bakeathon, but for now I
> removed the global variable nr_sequence_quads and just set the buffer
> sizes statically. We need to develop an approach that will support
> NFSv4.0 and NFSv4.1.

Just pass the replen as an argument to encode_readdir/encode_read/... so
that the caller can decide how much padding is needed.
The only reason why we haven't done this previously is that there is
only one caller (NFSv4.0).

Cheers
  Trond