From: Li Dongyang <lidongyang@novell.com>
Date: Thu, 1 Sep 2011 10:39:09 +0000 (+0800)
Subject: xen-blkfront: Handle discard requests.
X-Git-Tag: v3.2-rc1~48^2~3^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed30bf317c5ceb25166cdbce3e0b35e33c82b509;p=pandora-kernel.git

xen-blkfront: Handle discard requests.

If the backend advertises 'feature-discard', then interrogate
the backend for alignment and granularity. Setup the request
queue with the appropiate values and send the discard operation
as required.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
[v1: Amended commit description]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---

Reading git-diff-tree failed