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=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 26E47C43603 for ; Wed, 4 Dec 2019 20:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBAD8206DF for ; Wed, 4 Dec 2019 20:47:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728324AbfLDUrq (ORCPT ); Wed, 4 Dec 2019 15:47:46 -0500 Received: from mail.phunq.net ([66.183.183.73]:47250 "EHLO phunq.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727889AbfLDUrq (ORCPT ); Wed, 4 Dec 2019 15:47:46 -0500 Received: from [172.16.1.14] by phunq.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_128_GCM:128) (Exim 4.92.3) (envelope-from ) id 1icbYm-0007WV-HM; Wed, 04 Dec 2019 12:47:44 -0800 Subject: Re: [RFC] Thing 1: Shardmap fox Ext4 To: Andreas Dilger Cc: "Theodore Y. Ts'o" , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, OGAWA Hirofumi References: <176a1773-f5ea-e686-ec7b-5f0a46c6f731@phunq.net> <20191127142508.GB5143@mit.edu> <6b6242d9-f88b-824d-afe9-d42382a93b34@phunq.net> <6C8DAF47-CA09-4F3B-BF32-2D7044C1EE78@dilger.ca> From: Daniel Phillips Message-ID: <22c57727-2826-8945-1964-66e66fe82d39@phunq.net> Date: Wed, 4 Dec 2019 12:47:44 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <6C8DAF47-CA09-4F3B-BF32-2D7044C1EE78@dilger.ca> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-12-04 10:03 a.m., Andreas Dilger wrote: >> Here is a pretty picture to get started: >> >> https://github.com/danielbot/Shardmap/wiki/Shardmap-media-format > > The shardmap diagram is good conceptually, but it would be useful > to add a legend on the empty side of the diagram that shows the on-disk > structures. Sounds good, but not sure exactly what you had in mind. Fields of a shard entry? Fields of the block 0 header? The record entry block has its own diagram, and is polymorphic anyway, so no fixed format. Regards, Daniel