From: J. Bruce Fields <bfields@redhat.com>
Date: Thu, 29 Aug 2013 19:42:52 +0000 (-0400)
Subject: nfsd4: "backfill" using write_bytes_to_xdr_buf
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~67^2~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=082d4bd72a4527c6568f53f4a5de74e804666fa7;p=pandora-kernel.git

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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