From: Jens Axboe <jaxboe@fusionio.com>
Date: Tue, 12 Apr 2011 08:17:31 +0000 (+0200)
Subject: block: add callback function for unplug notification
X-Git-Tag: v2.6.39-rc4~22^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f75664570d8b75469cc468f23c2b27220984983b;p=pandora-kernel.git

block: add callback function for unplug notification

MD would like to know when a queue is unplugged, so it can flush
it's bitmap writes. Add such a callback.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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