Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [RFC] Thing 1: Shardmap fox Ext4
To:     Andreas Dilger <adilger@dilger.ca>
Cc:     "Theodore Y. Ts'o" <tytso@mit.edu>, linux-ext4@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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 <daniel@phunq.net>
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

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