From 30596768b31069a3ae08fc305f394efb8c42b473 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Mon, 19 May 2014 16:18:23 -0400
Subject: [PATCH] nfsd4: fix buflen calculation after read encoding

We don't necessarily want to assume that the buflen is the same
as the number of bytes available in the pages.  We may have some reason
to set it to something less (for example, later patches will use a
smaller buflen to enforce session limits).

So, calculate the buflen relative to the previous buflen instead of
recalculating it from scratch.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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