From nobody Sun Oct 5 19:25:04 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1582814809; cv=none; d=zohomail.com; s=zohoarc; b=LW2wxuZKc/ttpuwOokS2SttrYfBWPl0c9t8O2blcWKsc7DiSxx+gsunjE3YMD8adIAWKn08zM8ojTqxx0HMypc1C5m3dLQYkCXfEcKcCjKTFiOTst2Txg79wkYv4pCiS0pGxwfNmCbbCIpxuQDHpz9nolUu/uVWeGmoB5ttaSJo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1582814809; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=lqRreKUvlKKr8Mhc4Kmd7XzILfN7OdpZLwZTluyP8R0=; b=S9xh+CprC2ikiMLme9pKsotT/ur+0ngMC4dw6TOdJsnVXFZDjASbVBsqRvdRaD0MR8pOWVbutFvG88GJ4a9G+Ef3PlYBNJF0BX29MhAxSMJL7e1N4e+iCjS2PZMwwj6bAtQR2PtwSMDMyYZAzSpBD7WGTs4Sh8FF0q6/aJL5q2s= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1582814809321104.36250473225186; Thu, 27 Feb 2020 06:46:49 -0800 (PST) Received: from localhost ([::1]:32940 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j7KR5-0000aj-PJ for importer@patchew.org; Thu, 27 Feb 2020 09:46:47 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:50035) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j7KPh-0007n8-Qk for qemu-devel@nongnu.org; Thu, 27 Feb 2020 09:45:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j7KPg-0000Ln-EK for qemu-devel@nongnu.org; Thu, 27 Feb 2020 09:45:21 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:31017 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j7KPg-0000Lg-Af for qemu-devel@nongnu.org; Thu, 27 Feb 2020 09:45:20 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-260-ZtgW8vLKMPae3VGIJ-JETg-1; Thu, 27 Feb 2020 09:45:13 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DF12FDBA7; Thu, 27 Feb 2020 14:45:11 +0000 (UTC) Received: from blue.redhat.com (ovpn-116-57.phx2.redhat.com [10.3.116.57]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1E5AB8C090; Thu, 27 Feb 2020 14:45:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582814719; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=lqRreKUvlKKr8Mhc4Kmd7XzILfN7OdpZLwZTluyP8R0=; b=gfL4t8TaXoqEjJRviegWm9ppecqRjihPQue0SMNKeieEZavVTkCXGeSMgtMSHtYyzPLyPQ i/8pmj215T9rHlA7xgY5r6DHsWUlKaXMDoaT0f03lWW/kM1obJmu3/2q5/FuwnU2Zaf1Il KvMuzm/2LIyawmtViTaLOJh3+Q/Z+Lo= X-MC-Unique: ZtgW8vLKMPae3VGIJ-JETg-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH] qcow2: Explicit mention of padding bytes Date: Thu, 27 Feb 2020 08:45:08 -0600 Message-Id: <20200227144508.1078501-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, dplotnikov@virtuozzo.com, vsementsov@virtuozzo.com, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Although we already covered the need for padding bytes with our changes in commit 3ae3fcfa, commit 66fcbca5 just added one byte and relied on the earlier text for implicitly covering 7 padding bytes. For consistency with other parts of the header, it does not hurt to be explicit that this version of the header is using padding bytes, and if we later add other extension fields, we can rework the allocation of those padding bytes to match those additions. Signed-off-by: Eric Blake --- docs/interop/qcow2.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt index 5597e244746e..193ac7c5c1af 100644 --- a/docs/interop/qcow2.txt +++ b/docs/interop/qcow2.txt @@ -209,6 +209,8 @@ version 2. Available compression type values: 0: zlib + 105 - m: Zero padding to round up the header size to the next + multiple of 8. =3D=3D=3D Header padding =3D=3D=3D --=20 2.25.1