From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH v5] libxl: add option for discard support to
 xl disk configuration
Date: Fri, 9 May 2014 14:18:46 +0200
Message-ID: <20140509121846.GA28727@aepfle.de>
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To: stefano.stabellini@eu.citrix.com
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On Fri, May 09, Olaf Hering wrote:

> Handle new boolean option discard/no-discard for disk configuration. It
> is supposed to disable discard support if file based backing storage was
> intentionally created non-sparse to avoid fragmentation of the file.
> 
> The option intended for the backend driver. A new boolean property
> "discard-enable" is written to the backend node. An upcoming patch for
> qemu will make use of this property. The kernel blkback driver may be
> updated as well to disable discard for phy based backing storage.

Stefano,

please backport these changes from qemu.git to qemu-xen.git so that
discard:

58da5b1e01a586eb5a52ba3eec342d6828269839 xen_disk: fix io accounting
f31352041bdde436c3f6d07e1525a42e48dec215 xen_disk: add discard support

Thanks.

Olaf