From: Christoph Hellwig <hch@lst.de>
Date: Thu, 21 Aug 2014 16:09:25 +0000 (-0500)
Subject: pnfs: allow splicing pre-encoded pages into the layoutcommit args
X-Git-Tag: fixes-for-v3.18-merge-window~10^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f919c9f10c1cf821ee5f414683214a361a1b98c;p=pandora-kernel.git

pnfs: allow splicing pre-encoded pages into the layoutcommit args

Currently there is no XDR buffer space allocated for the per-layout driver
layoutcommit payload, which leads to server buffer overflows in the
blocklayout driver even under simple workloads.  As we can't do per-layout
sizes for XDR operations we'll have to splice a previously encoded list
of pages into the XDR stream, similar to how we handle ACL buffers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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