From: Li Dongyang <lidongyang@novell.com>
Date: Thu, 10 Nov 2011 07:52:06 +0000 (+0800)
Subject: xen-blkback: convert hole punching to discard request on loop devices
X-Git-Tag: v3.3-rc1~49^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae18be11b5ccc3be9e268592616488c5f9d987f5;p=pandora-kernel.git

xen-blkback: convert hole punching to discard request on loop devices

As of dfaa2ef68e80c378e610e3c8c536f1c239e8d3ef, loop devices support
discard request now. We could just issue a discard request, and
the loop driver will punch the hole for us, so we don't need to touch
the internals of loop device and punch the hole ourselves, Thanks.

V0->V1: rebased on devel/for-jens-3.3

Signed-off-by: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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