From: NeilBrown <neilb@suse.de>
Date: Mon, 19 Mar 2012 01:46:39 +0000 (+1100)
Subject: md: add proper merge_bvec handling to RAID0 and Linear.
X-Git-Tag: v3.4-rc1~147^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba13da47ffa202784355561f72160a41350e95cc;p=pandora-kernel.git

md: add proper merge_bvec handling to RAID0 and Linear.

These personalities currently set a max request size of one page
when any member device has a merge_bvec_fn because they don't
bother to call that function.

This causes extra works in splitting and combining requests.

So make the extra effort to call the merge_bvec_fn when it exists
so that we end up with larger requests out the bottom.

Signed-off-by: NeilBrown <neilb@suse.de>
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