From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LKc97-00078d-TZ for qemu-devel@nongnu.org; Wed, 07 Jan 2009 12:24:46 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LKc96-00077I-CJ for qemu-devel@nongnu.org; Wed, 07 Jan 2009 12:24:45 -0500 Received: from [199.232.76.173] (port=53919 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LKc95-000779-W2 for qemu-devel@nongnu.org; Wed, 07 Jan 2009 12:24:44 -0500 Received: from mx2.suse.de ([195.135.220.15]:44837) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LKc95-0002ql-LW for qemu-devel@nongnu.org; Wed, 07 Jan 2009 12:24:43 -0500 Received: from Relay1.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id DB92346E95 for ; Wed, 7 Jan 2009 18:24:40 +0100 (CET) From: Ulrich Hecht Date: Wed, 7 Jan 2009 18:24:39 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Message-Id: <200901071824.40113.uli@suse.de> Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] qcow1 compression Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Hi! I have received a bug report from one of our users about compression in=20 qcow(1). He converted disk images to qcow with compression, and the=20 resulting images did not work. I looked into block-qcow.c and found=20 several huge and, as it seems, long-standing bugs. For instance,=20 QCOW_OFLAG_COMPRESSED is never set anywhere, causing compressed data to=20 be returned verbatim on reading. I'd like to get people's opinion on whether there is any point in fixing=20 this stuff, considering that there is qcow2, and that it never worked to=20 begin with. Perhaps a patch removing it would make more sense... CU Uli --=20 SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG N=FCrnberg)