From: NeilBrown <neilb@suse.de>
Date: Thu, 28 Jul 2011 01:32:10 +0000 (+1000)
Subject: md/raid1: store behind-write pages in bi_vecs.
X-Git-Tag: v3.1-rc1~131^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ca68f5ed7383733102ee53cd8fa4021ecc3b275;p=pandora-kernel.git

md/raid1: store behind-write pages in bi_vecs.

When performing write-behind we allocate pages to store the data
during write.
Previously we just keep a list of pages.  Now we keep a list of
bi_vec which includes offset and size.
This means that the r1bio has complete information to create a new
bio which will be needed for retrying after write errors.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
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