From 082d4bd72a4527c6568f53f4a5de74e804666fa7 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Thu, 29 Aug 2013 15:42:52 -0400
Subject: [PATCH] nfsd4: "backfill" using write_bytes_to_xdr_buf

Normally xdr encoding proceeds in a single pass from start of a buffer
to end, but sometimes we have to write a few bytes to an earlier
position.

Use write_bytes_to_xdr_buf for these cases rather than saving a pointer
to write to.  We plan to rewrite xdr_reserve_space to handle encoding
across page boundaries using a scratch buffer, and don't want to risk
writing to a pointer that was contained in a scratch buffer.

Also it will no longer be safe to calculate lengths by subtracting two
pointers, so use xdr_buf offsets instead.

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