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=-7.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 2AD83C43441 for ; Wed, 14 Nov 2018 03:47:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC16C2145D for ; Wed, 14 Nov 2018 03:47:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC16C2145D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=cn.fujitsu.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-btrfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731710AbeKNNtJ (ORCPT ); Wed, 14 Nov 2018 08:49:09 -0500 Received: from mail.cn.fujitsu.com ([183.91.158.132]:47080 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727770AbeKNNtI (ORCPT ); Wed, 14 Nov 2018 08:49:08 -0500 X-IronPort-AV: E=Sophos;i="5.43,368,1503331200"; d="scan'208";a="48058281" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 14 Nov 2018 11:47:45 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 0324D4B6ED4F; Wed, 14 Nov 2018 11:47:42 +0800 (CST) Received: from fnst.localdomain (10.167.226.155) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.408.0; Wed, 14 Nov 2018 11:47:47 +0800 Date: Wed, 14 Nov 2018 11:47:39 +0800 From: Lu Fengqi To: , Subject: Re: [PATCH v15.1 00/13] Btrfs In-band De-duplication Message-ID: <20181114034739.GA1835@fnst.localdomain> References: <20181106064122.6154-1-lufq.fnst@cn.fujitsu.com> <20181113134545.GY24115@twin.jikos.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20181113134545.GY24115@twin.jikos.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-Originating-IP: [10.167.226.155] X-yoursite-MailScanner-ID: 0324D4B6ED4F.AAB30 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: lufq.fnst@cn.fujitsu.com Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Tue, Nov 13, 2018 at 02:45:45PM +0100, David Sterba wrote: >On Tue, Nov 06, 2018 at 02:41:09PM +0800, Lu Fengqi wrote: >> This patchset can be fetched from github: >> https://github.com/littleroad/linux.git dedupe_latest >> >> Now the new base is v4.20-rc1. > >Before anybody spends more time with this patchset: this is a big >feature and quite intrusive to several btrfs subsystems. Currently it's >on hold as it requires finishing the design phase, it's still only the >in-memory backend and before we claim in-band dedupe, the persistent >hash tree needs to be at least drafted or prototyped. Thanks for your explanation. However, I'm not sure why we need to draft a prototype of the persistent hash tree first when we are talking about the memory backend. -- Thanks, Lu > >At this point there are several features that are in a more complete >state so they get preferred when it comes to merging. I would have to >look up what was agreed long time ago as merging plan, but at this point >this series would require a lot of work. > >