{"id":816290,"url":"http://patchwork.ozlabs.org/api/covers/816290/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/cover/20170920135833.20472-1-pbutsykin@virtuozzo.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","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":"<20170920135833.20472-1-pbutsykin@virtuozzo.com>","list_archive_url":null,"date":"2017-09-20T13:58:31","name":"[0/2] Truncate the tail of the image file in qcow2 shrinking","submitter":{"id":67271,"url":"http://patchwork.ozlabs.org/api/people/67271/?format=json","name":"Pavel Butsykin","email":"pbutsykin@virtuozzo.com"},"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/cover/20170920135833.20472-1-pbutsykin@virtuozzo.com/mbox/","series":[{"id":4142,"url":"http://patchwork.ozlabs.org/api/series/4142/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=4142","date":"2017-09-20T13:58:33","name":"Truncate the tail of the image file in qcow2 shrinking","version":1,"mbox":"http://patchwork.ozlabs.org/series/4142/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/816290/comments/","headers":{"Return-Path":"","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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SFP:1102; SCL:1; SRVR:HE1PR0802MB2554;\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":"20 Sep 2017 13:58:42.1895\n\t(UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"HE1PR0802MB2554","X-detected-operating-system":"by eggs.gnu.org: Windows 7 or 8 [fuzzy]","X-Received-From":"104.47.2.90","Subject":"[Qemu-devel] [PATCH 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":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"kwolf@redhat.com, den@openvz.org, mreitz@redhat.com,\n\tpbutsykin@virtuozzo.com","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"\"Qemu-devel\"\n\t"},"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\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 | 21 +++++++++++++++++++++\n block/qcow2.c | 23 +++++++++++++++++++++--\n block/qcow2.h | 1 +\n 3 files changed, 43 insertions(+), 2 deletions(-)"}