From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45785) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWCw6-0003HK-Cl for qemu-devel@nongnu.org; Wed, 17 Feb 2016 19:59:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aWCw0-0003OR-Ri for qemu-devel@nongnu.org; Wed, 17 Feb 2016 19:59:14 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50670) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWCw0-0003OF-MV for qemu-devel@nongnu.org; Wed, 17 Feb 2016 19:59:08 -0500 Date: Thu, 18 Feb 2016 08:59:03 +0800 From: Fam Zheng Message-ID: <20160218005903.GC5766@ad.usersys.redhat.com> References: <1454151394-52320-1-git-send-email-vsementsov@virtuozzo.com> <20160203081418.GC25746@ad.usersys.redhat.com> <56B45D3A.405@virtuozzo.com> <20160209142852.GA13149@stefanha-x1.localdomain> <56B9FAAE.8040503@virtuozzo.com> <20160210101004.GB7317@stefanha-x1.localdomain> <20160216170943.GA31393@stefanha-x1.localdomain> <56C4B21F.9030006@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <56C4B21F.9030006@virtuozzo.com> Subject: Re: [Qemu-devel] [PATCH v2 0/6] external backup api List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Vladimir Sementsov-Ogievskiy Cc: kwolf@redhat.com, "Denis V. Lunev" , Stefan Hajnoczi , armbru@redhat.com, qemu-devel@nongnu.org, jsnow@redhat.com On Wed, 02/17 20:47, Vladimir Sementsov-Ogievskiy wrote: > What about exporting bitmap as separate nbd entity? Just implement > block driver, which will read from bitmap? If consider only read > access and disabled (or frozen) bitmaps it should be simple enough. Yes, I think this idea also makes sense. The driver could implement .bdrv_read by memcpy from the bitmap. Fam