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{ "id": 2229019, "url": "http://patchwork.ozlabs.org/api/1.1/covers/2229019/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260427170520.101242-1-kwolf@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/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": "" }, "msgid": "<20260427170520.101242-1-kwolf@redhat.com>", "date": "2026-04-27T17:05:16", "name": "[0/4] qcow2: Fix corruption on discard during write with COW", "submitter": { "id": 2714, "url": "http://patchwork.ozlabs.org/api/1.1/people/2714/?format=api", "name": "Kevin Wolf", "email": "kwolf@redhat.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260427170520.101242-1-kwolf@redhat.com/mbox/", "series": [ { "id": 501688, "url": "http://patchwork.ozlabs.org/api/1.1/series/501688/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501688", "date": "2026-04-27T17:05:16", "name": "qcow2: Fix corruption on discard during write with COW", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501688/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2229019/comments/", "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=NUKfexdq;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g491y2dWGz1xvV\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 28 Apr 2026 03:05:58 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wHPP2-0007Y0-9E; Mon, 27 Apr 2026 13:05:48 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <kwolf@redhat.com>) id 1wHPP0-0007U0-1e\n for qemu-devel@nongnu.org; Mon, 27 Apr 2026 13:05:46 -0400", "from us-smtp-delivery-124.mimecast.com ([170.10.129.124])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <kwolf@redhat.com>) id 1wHPOy-0006NE-KU\n for qemu-devel@nongnu.org; Mon, 27 Apr 2026 13:05:45 -0400", "from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com\n (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by\n relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3,\n cipher=TLS_AES_256_GCM_SHA384) id us-mta-421-K8iLuBRbM_2UTbEIT5v4CA-1; Mon,\n 27 Apr 2026 13:05:40 -0400", "from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com\n (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS\n id 2C72B19560AB; Mon, 27 Apr 2026 17:05:39 +0000 (UTC)", "from merkur.fritz.box (unknown [10.44.49.22])\n by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP\n id D1838180047F; Mon, 27 Apr 2026 17:05:36 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1777309543;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n bh=zGre//01tH2c35nomgMy5ZkAJ2hN3fs8V+xTYufnCEk=;\n b=NUKfexdqVSnxQEqtBawLcpNUAIBkqthjmZ++0v70OQRrCKBlx5Z1drY//MYeZzeknR1aGc\n NOwUX70kLmFDxqomUu9cJsi9SXmRRRIlnfePrsyxxYMOHW2nTPGV36H6v8vq2hPh/KOJ0i\n phzEMUddlgs85UwH2RMxpj+gJcO1MEg=", "X-MC-Unique": "K8iLuBRbM_2UTbEIT5v4CA-1", "X-Mimecast-MFC-AGG-ID": "K8iLuBRbM_2UTbEIT5v4CA_1777309539", "From": "Kevin Wolf <kwolf@redhat.com>", "To": "qemu-block@nongnu.org", "Cc": "kwolf@redhat.com, hreitz@redhat.com, den@openvz.org, stefanha@redhat.com,\n qemu-stable@nongnu.org, qemu-devel@nongnu.org", "Subject": "[PATCH 0/4] qcow2: Fix corruption on discard during write with COW", "Date": "Mon, 27 Apr 2026 19:05:16 +0200", "Message-ID": "<20260427170520.101242-1-kwolf@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "Received-SPF": "pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://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 <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "This is an alternative fix for the corruption problem reported by Denis:\nhttps://patchew.org/QEMU/20260421155628.3600671-1-den@openvz.org/\n\nI think it really is a qcow2 level bug and should be fixed on the qcow2\nlevel. The test is also more targeted than just doing random I/O for a\nwhile, and therefore runs faster and documents the problem better.\n\nKevin Wolf (4):\n commit: Drain nodes across all of bdrv_commit()\n qemu-io: Add 'aio_discard' command\n qcow2: Fix corruption on discard during write with COW\n iotests/046: Test that discard/write_zeroes wait for dependencies\n\n block/commit.c | 10 +++-\n block/qcow2-cluster.c | 52 ++++++++++++++++-\n qemu-io-cmds.c | 113 +++++++++++++++++++++++++++++++++++++\n tests/qemu-iotests/046 | 46 +++++++++++++++\n tests/qemu-iotests/046.out | 36 ++++++++++++\n 5 files changed, 252 insertions(+), 5 deletions(-)" }