Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754189Ab1DUIie (ORCPT ); Thu, 21 Apr 2011 04:38:34 -0400 Received: from smtp.eu.citrix.com ([62.200.22.115]:27757 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752966Ab1DUIic (ORCPT ); Thu, 21 Apr 2011 04:38:32 -0400 X-IronPort-AV: E=Sophos;i="4.64,250,1301875200"; d="scan'208";a="5408556" Subject: Re: [Xen-devel] Re: [PATCH v3] xen block backend. From: Ian Campbell To: Christoph Hellwig CC: "xen-devel@lists.xensource.com" , Stefano Stabellini , "jaxboe@fusionio.com" , Konrad Rzeszutek Wilk , "linux-kernel@vger.kernel.org" , "konrad@kernel.org" In-Reply-To: <20110421080638.GA10630@infradead.org> References: <1303333543-5915-1-git-send-email-konrad.wilk@oracle.com> <20110421033735.GA11501@infradead.org> <1303370925.5997.322.camel@zakaz.uk.xensource.com> <1303373003.5997.337.camel@zakaz.uk.xensource.com> <20110421080638.GA10630@infradead.org> Content-Type: text/plain; charset="UTF-8" Organization: Citrix Systems, Inc. Date: Thu, 21 Apr 2011 09:38:31 +0100 Message-ID: <1303375111.5997.341.camel@zakaz.uk.xensource.com> MIME-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1145 Lines: 26 On Thu, 2011-04-21 at 09:06 +0100, Christoph Hellwig wrote: > On Thu, Apr 21, 2011 at 09:03:23AM +0100, Ian Campbell wrote: > > BTW about the only nice property blktap has as it currently stands over > > this plan is that it exports an actual block device from vhd, qcow etc > > files (in some sense blktap is a loopback driver for complex disk image > > file formats). It turns out to occasionally be quite useful to be able > > to mount such files, even on non-virtualisation systems (in its current > > incarnation blktap has no dependency on Xen). > > You can already do that using qemu-nbd today. Good to know, I'd had a vague feeling this was possible but hadn't looked into how. > In most cases the image format support in qemu is much better than in the various Xen trees > anyway, with vhd beeing the only one that looks potentially better in Xen. That's about what I reckon too. Ian. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/