From 48e03bc515cff75718de5460458680a230ae997e Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@fys.uio.no>
Date: Fri, 5 Jun 2009 12:35:15 -0400
Subject: [PATCH] nfsd: Use write gathering only with NFSv2

NFSv3 and above can use unstable writes whenever they are sending more
than one write, rather than relying on the flaky write gathering
heuristics. More often than not, write gathering is currently getting it
wrong when the NFSv3 clients are sending a single write with FILE_SYNC
for efficiency reasons.

This patch turns off write gathering for NFSv3/v4, and ensures that
it only applies to the one case that can actually benefit: namely NFSv2.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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