linux-kernel - Re: Re: dm overlaybd: targets mapping OverlayBD image

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Message-Id: <20230526102855.36774-1-durui@linux.alibaba.com>
Date:   Fri, 26 May 2023 18:28:56 +0800
From:   Du Rui <durui@...ux.alibaba.com>
To:     gscrivan@...hat.com
Cc:     agk@...hat.com, alexl@...hat.com, dm-devel@...hat.com,
        durui@...ux.alibaba.com, hsiangkao@...ux.alibaba.com,
        linux-kernel@...r.kernel.org, snitzer@...nel.org
Subject: Re: Re: dm overlaybd: targets mapping OverlayBD image

Hi Giuseppe,

> The current OCI format, with some tweaks like (e)stargz or zstd:chunked,
> already make its content addressable and a client can retrieve only the
> subset of the files that are needed.  At the same time we maintain the
> simplicity of a tarball and it won't break existing clients.

Yes, I believe backward compatibility is very important. That's why we
have another design called foci (fast oci). It realize a virtual block
device from gzip image blobs. See the following link for details if interested.
https://github.com/containerd/accelerated-container-image/blob/main/docs/FASTOCI.md