From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3896C3A59E for ; Sat, 24 Aug 2019 03:38:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A639921019 for ; Sat, 24 Aug 2019 03:38:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726111AbfHXDiB (ORCPT ); Fri, 23 Aug 2019 23:38:01 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:36443 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725807AbfHXDiB (ORCPT ); Fri, 23 Aug 2019 23:38:01 -0400 Received: by mail-pl1-f195.google.com with SMTP id f19so6716134plr.3 for ; Fri, 23 Aug 2019 20:38:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=kTVoI+i1OzxyD1KK+Mc6yIpwDJh7u1+gbcsQAqIkmG8=; b=ZSbyzcY2IRdHhQH+tjo6FXB9DBSg9LQvNx3VI/Zk01WMEyTktWRLdUU5WEtavTkqM7 8a2tyD5ZXp+RfaF7dcDV32Fmg51zXgRtbunMudHfhBH98UgjBvktAU++1B1pJp/e4ivh ozPqAVdOkPbt7sBvVFQe3SsWIa0xyMwEzVgIpRoMAmMJoD1Hdo+CQ4P8MrRbm+qwn5k3 1rALifPp0n3rWNZun3/NMYfvvEjyPjMERn0lILtOpgG9qQy25uRKdsI4oiYpYnDUHFTH sp0IlNQgKS/TQu1ol0qGJnC+3rDi+WhNLB43gmm3v/Ytp5uPPXysUMLVDK6ZlyxfcbSA WW4Q== X-Gm-Message-State: APjAAAV+tQSwF1xpn+wqXX5Sj0jdoXSiVRtdYr8glQqY7Z4H3Wav3qgf aI65ymu2SQhwfPV0WtJ3tMme0znf X-Google-Smtp-Source: APXvYqztrrthsfKL5xGiT+ZdGC8oWDOge+EN2vf8SXdOpzYrWaCqseVFgYSsg71653gQeBVUk+78tA== X-Received: by 2002:a17:902:aa09:: with SMTP id be9mr8020443plb.52.1566617880587; Fri, 23 Aug 2019 20:38:00 -0700 (PDT) Received: from asus.site ([2601:647:4000:1349:56c2:95e9:3c7:9c11]) by smtp.gmail.com with ESMTPSA id v8sm3892863pjb.6.2019.08.23.20.37.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Aug 2019 20:37:59 -0700 (PDT) Subject: Re: [PATCH 0/5] block: loop: add file format subsystem and QCOW2 file format driver To: development@manuel-bentele.de, linux-block@vger.kernel.org References: <20190823225619.15530-1-development@manuel-bentele.de> From: Bart Van Assche Message-ID: Date: Fri, 23 Aug 2019 20:37:58 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190823225619.15530-1-development@manuel-bentele.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 8/23/19 3:56 PM, development@manuel-bentele.de wrote: > During the discussion, it turned out that the implementation as device > mapper target is not applicable. The device mapper stacks different > functionality such as compression or encryption on multiple block device > layers whereas an implementation for the QCOW2 container format provides > these functionalities on one block device layer. Hi Manuel, Is there a more detailed discussion available of this subject? Are you familiar with the dm-crypt driver? Thanks, Bart.