[{"id":1773413,"web_url":"http://patchwork.ozlabs.org/comment/1773413/","msgid":"<20170922095007.GI12725@redhat.com>","list_archive_url":null,"date":"2017-09-22T09:50:07","subject":"Re: [Qemu-devel] [PATCH v2 0/2] Truncate the tail of the image file\n\tin qcow2 shrinking","submitter":{"id":2694,"url":"http://patchwork.ozlabs.org/api/people/2694/","name":"Daniel P. Berrangé","email":"berrange@redhat.com"},"content":"On Fri, Sep 22, 2017 at 12:39:24PM +0300, Pavel Butsykin wrote:\n> Now after shrinking the qcow2 image, at the end of the image file, there might\n> be a tail that probably will never be used. Although it will not bring any\n> tangible benefit, we can cut the tail if it is. Yes, it will not free up disk\n> space, but if the blocks were be allocated sequentially and the image is not\n> heavily fragmented then the virtual size of the image file will be commensurate\n> with the real size. It also doesn't look like a great plus.. Well, at least we\n> can discuss it.\n\nIf the block backend has discard support enabled, can't we get the tail\nto be discarded rather than merely truncated ?\n\nRegards,\nDaniel","headers":{"Return-Path":"<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=<UNKNOWN>)","ext-mx10.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com","ext-mx10.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=berrange@redhat.com"],"Received":["from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xz7yh2zKxz9t3h\n\tfor <incoming@patchwork.ozlabs.org>;\n\tFri, 22 Sep 2017 19:50:51 +1000 (AEST)","from localhost ([::1]:57634 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>)\n\tid 1dvKbh-0004sY-4u\n\tfor incoming@patchwork.ozlabs.org; Fri, 22 Sep 2017 05:50:49 -0400","from eggs.gnu.org ([2001:4830:134:3::10]:42947)\n\tby lists.gnu.org with esmtp (Exim 4.71)\n\t(envelope-from <berrange@redhat.com>) id 1dvKbH-0004qv-Hu\n\tfor qemu-devel@nongnu.org; Fri, 22 Sep 2017 05:50:24 -0400","from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <berrange@redhat.com>) id 1dvKbG-0002S6-NI\n\tfor qemu-devel@nongnu.org; Fri, 22 Sep 2017 05:50:23 -0400","from mx1.redhat.com ([209.132.183.28]:60831)\n\tby eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.71) (envelope-from <berrange@redhat.com>)\n\tid 1dvKbA-0002P8-W1; Fri, 22 Sep 2017 05:50:17 -0400","from smtp.corp.redhat.com\n\t(int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id BDD844B716;\n\tFri, 22 Sep 2017 09:50:15 +0000 (UTC)","from redhat.com (unknown [10.33.36.109])\n\tby smtp.corp.redhat.com (Postfix) with ESMTPS id 507C8619E7;\n\tFri, 22 Sep 2017 09:50:10 +0000 (UTC)"],"DMARC-Filter":"OpenDMARC Filter v1.3.2 mx1.redhat.com BDD844B716","Date":"Fri, 22 Sep 2017 10:50:07 +0100","From":"\"Daniel P. Berrange\" <berrange@redhat.com>","To":"Pavel Butsykin <pbutsykin@virtuozzo.com>","Message-ID":"<20170922095007.GI12725@redhat.com>","References":"<20170922093926.9723-1-pbutsykin@virtuozzo.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","In-Reply-To":"<20170922093926.9723-1-pbutsykin@virtuozzo.com>","User-Agent":"Mutt/1.8.3 (2017-05-23)","X-Scanned-By":"MIMEDefang 2.79 on 10.5.11.12","X-Greylist":"Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.39]);\n\tFri, 22 Sep 2017 09:50:16 +0000 (UTC)","X-detected-operating-system":"by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]\n\t[fuzzy]","X-Received-From":"209.132.183.28","Subject":"Re: [Qemu-devel] [PATCH v2 0/2] Truncate the tail of the image file\n\tin qcow2 shrinking","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Id":"<qemu-devel.nongnu.org>","List-Unsubscribe":"<https://lists.nongnu.org/mailman/options/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>","List-Archive":"<http://lists.nongnu.org/archive/html/qemu-devel/>","List-Post":"<mailto:qemu-devel@nongnu.org>","List-Help":"<mailto:qemu-devel-request@nongnu.org?subject=help>","List-Subscribe":"<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=subscribe>","Reply-To":"\"Daniel P. Berrange\" <berrange@redhat.com>","Cc":"kwolf@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org,\n\tmreitz@redhat.com, den@openvz.org, jsnow@redhat.com","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"\"Qemu-devel\"\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>"}},{"id":1773561,"web_url":"http://patchwork.ozlabs.org/comment/1773561/","msgid":"<feec0aee-291a-236e-bbf0-78eaa9f1d159@virtuozzo.com>","list_archive_url":null,"date":"2017-09-22T12:33:18","subject":"Re: [Qemu-devel] [PATCH v2 0/2] Truncate the tail of the image file\n\tin qcow2 shrinking","submitter":{"id":67271,"url":"http://patchwork.ozlabs.org/api/people/67271/","name":"Pavel Butsykin","email":"pbutsykin@virtuozzo.com"},"content":"On 22.09.2017 12:50, Daniel P. Berrange wrote:\n> On Fri, Sep 22, 2017 at 12:39:24PM +0300, Pavel Butsykin wrote:\n>> Now after shrinking the qcow2 image, at the end of the image file, there might\n>> be a tail that probably will never be used. Although it will not bring any\n>> tangible benefit, we can cut the tail if it is. Yes, it will not free up disk\n>> space, but if the blocks were be allocated sequentially and the image is not\n>> heavily fragmented then the virtual size of the image file will be commensurate\n>> with the real size. It also doesn't look like a great plus.. Well, at least we\n>> can discuss it.\n> \n> If the block backend has discard support enabled, can't we get the tail\n> to be discarded rather than merely truncated ?\n\n\nIt has already been implemented. (see \nhttps://lists.gnu.org/archive/html/qemu-devel/2017-09/msg04581.html)\nSorry, I just forgot to mention that this patch rebased on Max's block\nbranch (https://github.com/XanClic/qemu/commits/block). Actually the\ntruncation will always be done on the already discarded area. It can\nbe useful only if the block backend doesn't support discard or a file\nsystem doesn't support sparse files.\n\n> Regards,\n> Daniel\n>","headers":{"Return-Path":"<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=<UNKNOWN>)","ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=virtuozzo.com header.i=@virtuozzo.com\n\theader.b=\"e0Ze7Da4\"; dkim-atps=neutral","spf=none (sender IP is )\n\tsmtp.mailfrom=pbutsykin@virtuozzo.com; "],"Received":["from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xzCty6kPhz9sPm\n\tfor <incoming@patchwork.ozlabs.org>;\n\tFri, 22 Sep 2017 22:47:54 +1000 (AEST)","from localhost ([::1]:58696 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>)\n\tid 1dvNN2-0004oe-UE\n\tfor incoming@patchwork.ozlabs.org; Fri, 22 Sep 2017 08:47:52 -0400","from eggs.gnu.org ([2001:4830:134:3::10]:57019)\n\tby lists.gnu.org with esmtp (Exim 4.71)\n\t(envelope-from <pbutsykin@virtuozzo.com>) id 1dvN9B-0001IT-C0\n\tfor qemu-devel@nongnu.org; Fri, 22 Sep 2017 08:33:34 -0400","from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <pbutsykin@virtuozzo.com>) id 1dvN98-0006MN-7O\n\tfor qemu-devel@nongnu.org; Fri, 22 Sep 2017 08:33:33 -0400","from mail-eopbgr40120.outbound.protection.outlook.com\n\t([40.107.4.120]:56960\n\thelo=EUR03-DB5-obe.outbound.protection.outlook.com)\n\tby eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.71) (envelope-from <pbutsykin@virtuozzo.com>)\n\tid 1dvN97-0006Lk-GV; Fri, 22 Sep 2017 08:33:30 -0400","from [172.16.25.50] (195.214.232.6) by\n\tVI1PR0802MB2558.eurprd08.prod.outlook.com (2603:10a6:800:ae::8) with\n\tMicrosoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.77.7;\n\tFri, 22 Sep 2017 12:33:25 +0000"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=virtuozzo.com;\n\ts=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version;\n\tbh=mljhIbxKryUyFTmghUg7xasogwQhFOshCiCCNSfQKN4=;\n\tb=e0Ze7Da4cjbmss9M4vgJrTqCVtox5jZuvm+4bBQCXqSWS1KGrhSi6m5KQS6WsqCnA9iyk5/HwtJSqcs/2G07MlYkduIXld6vMLhswMgDLUp0UUl1SAfmSQ/ELP22JGl2qjTgfHv0a442Y2CY7nR/ZsOJYzd8gj5jnOgm33BW8zA=","To":"\"Daniel P. Berrange\" <berrange@redhat.com>","References":"<20170922093926.9723-1-pbutsykin@virtuozzo.com>\n\t<20170922095007.GI12725@redhat.com>","From":"Pavel Butsykin <pbutsykin@virtuozzo.com>","Message-ID":"<feec0aee-291a-236e-bbf0-78eaa9f1d159@virtuozzo.com>","Date":"Fri, 22 Sep 2017 15:33:18 +0300","User-Agent":"Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101\n\tThunderbird/52.2.1","MIME-Version":"1.0","In-Reply-To":"<20170922095007.GI12725@redhat.com>","Content-Type":"text/plain; charset=utf-8; format=flowed","Content-Language":"en-US","Content-Transfer-Encoding":"7bit","X-Originating-IP":"[195.214.232.6]","X-ClientProxiedBy":"AM5P194CA0002.EURP194.PROD.OUTLOOK.COM\n\t(2603:10a6:203:8f::12) To VI1PR0802MB2558.eurprd08.prod.outlook.com\n\t(2603:10a6:800:ae::8)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"656734ba-feee-4e85-2a9b-08d501b61f65","X-Microsoft-Antispam":"UriScan:; BCL:0; PCL:0;\n\tRULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254152)(300000503095)(300135400095)(2017052603199)(201703131423075)(201703031133081)(201702281549075)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095);\n\tSRVR:VI1PR0802MB2558; 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