From: Paul Clements <paul.clements@steeleye.com>
Date: Mon, 8 Mar 2010 05:02:37 +0000 (+1100)
Subject: md: expose max value of behind writes counter
X-Git-Tag: v2.6.35-rc1~440^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=696fcd535b5a8cfc0617e9cf1d9d69a13895cc1e;p=pandora-kernel.git

md: expose max value of behind writes counter

Keep track of the maximum number of concurrent write-behind requests
for an md array and exposed this number in sysfs at
   md/bitmap/max_backlog_used

Writing any value to this file will clear it.

This allows userspace to be involved in tuning bitmap/backlog.

Signed-off-by: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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