From patchwork Wed May 17 16:51:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13245360 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1C621C77B7D for ; Wed, 17 May 2023 16:53:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pzKND-0003wt-8Y; Wed, 17 May 2023 12:51:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pzKNC-0003we-CF for qemu-devel@nongnu.org; Wed, 17 May 2023 12:51:34 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pzKNA-0001PO-P0 for qemu-devel@nongnu.org; Wed, 17 May 2023 12:51:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684342292; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zstI19rKVNa+kdrsTIs7vlvr1F7iq82cM+TZD7FBpS8=; b=BeLH7y8LoceW1UsWJvhHfdLTb4yHsfis26UI1j79vXVX859pwAX3exlj806MZV3H9+LV+Q YxGjBmaKv3t5RPfyOlOrJAqELUvjMehiszboVgfhf8XSEuP4HZdM86VU5vtJlmm4719mZi j2+XSceEXsdnQ5jC1TPiozTEHgfmt5U= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-458-3iiP3wSYMvi2nMagyPFIJA-1; Wed, 17 May 2023 12:51:30 -0400 X-MC-Unique: 3iiP3wSYMvi2nMagyPFIJA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 57AF529AB3EC; Wed, 17 May 2023 16:51:30 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.194.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id A054940C6EC4; Wed, 17 May 2023 16:51:29 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org Subject: [PULL 07/18] docs/interop/qcow2.txt: fix description about "zlib" clusters Date: Wed, 17 May 2023 18:51:05 +0200 Message-Id: <20230517165116.475123-8-kwolf@redhat.com> In-Reply-To: <20230517165116.475123-1-kwolf@redhat.com> References: <20230517165116.475123-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Akihiro Suda "zlib" clusters are actually raw deflate (RFC1951) clusters without zlib headers. Signed-off-by: Akihiro Suda Message-Id: <168424874322.11954.1340942046351859521-0@git.sr.ht> Reviewed-by: Eric Blake Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- docs/interop/qcow2.txt | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt index f7dc304ff6..e7f036c286 100644 --- a/docs/interop/qcow2.txt +++ b/docs/interop/qcow2.txt @@ -214,14 +214,18 @@ version 2. type. If the incompatible bit "Compression type" is set: the field - must be present and non-zero (which means non-zlib + must be present and non-zero (which means non-deflate compression type). Otherwise, this field must not be present - or must be zero (which means zlib). + or must be zero (which means deflate). Available compression type values: - 0: zlib + 0: deflate 1: zstd + The deflate compression type is called "zlib" + in QEMU. However, clusters with the + deflate compression type do not have zlib headers. + === Header padding ===