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{ "id": 817421, "url": "http://patchwork.ozlabs.org/api/covers/817421/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20170922093926.9723-1-pbutsykin@virtuozzo.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170922093926.9723-1-pbutsykin@virtuozzo.com>", "list_archive_url": null, "date": "2017-09-22T09:39:24", "name": "[v2,0/2] Truncate the tail of the image file in qcow2 shrinking", "submitter": { "id": 67271, "url": "http://patchwork.ozlabs.org/api/people/67271/?format=api", "name": "Pavel Butsykin", "email": "pbutsykin@virtuozzo.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20170922093926.9723-1-pbutsykin@virtuozzo.com/mbox/", "series": [ { "id": 4588, "url": "http://patchwork.ozlabs.org/api/series/4588/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=4588", "date": "2017-09-22T09:39:25", "name": "Truncate the tail of the image file in qcow2 shrinking", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/4588/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/817421/comments/", "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; 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Fri, 22 Sep 2017 05:40:13 -0400", "from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <pbutsykin@virtuozzo.com>) id 1dvKRL-0004a2-Dv\n\tfor qemu-devel@nongnu.org; Fri, 22 Sep 2017 05:40:12 -0400", "from mail-eopbgr00133.outbound.protection.outlook.com\n\t([40.107.0.133]:5029\n\thelo=EUR02-AM5-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 1dvKR9-00047J-Hu; Fri, 22 Sep 2017 05:39:56 -0400", "from pavelb-Z68P-DS3.sw.ru (195.214.232.6) by\n\tVI1PR0802MB2559.eurprd08.prod.outlook.com (2603:10a6:800:ae::9) 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 09:39:52 +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=6o+lkdxgw9Nu0Hpky1ptH3uJ//E0WiCuRMhK/zX0gaU=;\n\tb=H1CpB2yyI39SMqMrGICF+vh077x2QtHvUN6CoxjtebpsYYONcIKuretzUjiQThx0yDwz55eHyS7TB3u9muHT8LfM/Jt7WwvvW39TcbfMzAeU/4zo3wPoZi+NORd0lmBcSB22CHzAR3LIPXmUve3u7O7Y3XXeYkHcQ4jbU9/Ints=", "From": "Pavel Butsykin <pbutsykin@virtuozzo.com>", "To": "qemu-block@nongnu.org,\n\tqemu-devel@nongnu.org", "Date": "Fri, 22 Sep 2017 12:39:24 +0300", "Message-Id": "<20170922093926.9723-1-pbutsykin@virtuozzo.com>", "X-Mailer": "git-send-email 2.14.1", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[195.214.232.6]", "X-ClientProxiedBy": "HE1PR0401CA0046.eurprd04.prod.outlook.com\n\t(2603:10a6:3:19::14) To VI1PR0802MB2559.eurprd08.prod.outlook.com\n\t(2603:10a6:800:ae::9)", "X-MS-PublicTrafficType": "Email", "X-MS-Office365-Filtering-Correlation-Id": "0d133544-9baa-4990-cbd3-08d5019de080", "X-Microsoft-Antispam": "UriScan:; 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SFP:1102; SCL:1; SRVR:VI1PR0802MB2559;\n\tH:pavelb-Z68P-DS3.sw.ru; FPR:; SPF:None; PTR:InfoNoRecords; A:1;\n\tMX:1; LANG:en; ", "Received-SPF": "None (protection.outlook.com: virtuozzo.com does not designate\n\tpermitted sender hosts)", "SpamDiagnosticOutput": "1:99", "SpamDiagnosticMetadata": "NSPM", "X-OriginatorOrg": "virtuozzo.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "22 Sep 2017 09:39:52.1917\n\t(UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "0bc7f26d-0264-416e-a6fc-8352af79c58f", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "VI1PR0802MB2559", "X-detected-operating-system": "by eggs.gnu.org: Windows 7 or 8 [fuzzy]", "X-Received-From": "40.107.0.133", "Subject": "[Qemu-devel] [PATCH v2 0/2] Truncate the tail of the image file in\n\tqcow2 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>", "Cc": "kwolf@redhat.com, pbutsykin@virtuozzo.com, mreitz@redhat.com,\n\tden@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>" }, "content": "Now after shrinking the qcow2 image, at the end of the image file, there might\nbe a tail that probably will never be used. Although it will not bring any\ntangible benefit, we can cut the tail if it is. Yes, it will not free up disk\nspace, but if the blocks were be allocated sequentially and the image is not\nheavily fragmented then the virtual size of the image file will be commensurate\nwith the real size. It also doesn't look like a great plus.. Well, at least we\ncan discuss it.\n\nChanges from v1:\n- rewrite qcow2_get_last_cluster() function according to Max's comments. (2)\n\nPavel Butsykin (2):\n qcow2: fix return error code in qcow2_truncate()\n qcow2: truncate the tail of the image file after shrinking the image\n\n block/qcow2-refcount.c | 22 ++++++++++++++++++++++\n block/qcow2.c | 27 +++++++++++++++++++++++++--\n block/qcow2.h | 1 +\n 3 files changed, 48 insertions(+), 2 deletions(-)" }