From: NeilBrown <neilb@suse.de>
Date: Mon, 18 Apr 2011 07:52:22 +0000 (+0200)
Subject: block: Enhance new plugging support to support general callbacks
X-Git-Tag: v2.6.39-rc4~3^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=048c9374a749a27f16493cea033fa4a8ff492356;p=pandora-kernel.git

block: Enhance new plugging support to support general callbacks

md/raid requires an unplug callback, but as it does not uses
requests the current code cannot provide one.

So allow arbitrary callbacks to be attached to the blk_plug.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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