linux-kernel - Re: [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem

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Message-ID: <339d2a18-1c5b-998b-29f5-830d8904bcb3@linux.alibaba.com>
Date:   Tue, 24 Jan 2023 08:08:09 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Giuseppe Scrivano <gscrivan@...hat.com>,
        Amir Goldstein <amir73il@...il.com>
Cc:     Alexander Larsson <alexl@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        david@...morbit.com, brauner@...nel.org, viro@...iv.linux.org.uk,
        Vivek Goyal <vgoyal@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 0/6] Composefs: an opportunistically sharing verified
 image filesystem



On 2023/1/22 17:32, Giuseppe Scrivano wrote:
> Giuseppe Scrivano <gscrivan@...hat.com> writes:
> 

...

>>
>> How does validation work in EROFS for files served from fscache and that
>> are on a remote file system?
> 
> nevermind my last question, I guess it would still go through the block
> device in EROFS.
> This is clearly a point in favor of a block device approach that a
> stacking file system like overlay or composefs cannot achieve without
> support from the underlying file system.

nevermind my last answer,

I was thinking with Amir's advice, you could just use FUSE+overlayfs option
for this. I wonder if such option can meet all your requirements (including
unprivileged mounts) without increasing on-disk formats in kernel to do
unprivileged mounts.

If there are still missing features, you could enhance FUSE or overlayfs.

Thanks,
Gao Xiang