From: NeilBrown <neilb@suse.de>
Date: Mon, 18 Apr 2011 08:25:43 +0000 (+1000)
Subject: md: incorporate new plugging into raid5.
X-Git-Tag: v2.6.39-rc4~3^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c13edc87510f665da3094174e1fd633e06649f4;p=pandora-kernel.git

md: incorporate new plugging into raid5.

In raid5 plugging is used for 2 things:
 1/ collecting writes that require a bitmap update
 2/ collecting writes in the hope that we can create full
    stripes - or at least more-full.

We now release these different sets of stripes when plug_cnt
is zero.

Also in make_request, we call mddev_check_plug to hopefully increase
plug_cnt, and wake up the thread at the end if plugging wasn't
achieved for some reason.

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

Reading git-diff-tree failed