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

[Gao Xiang]

On 2023/1/22 17:32, Giuseppe Scrivano wrote:
> Giuseppe Scrivano <gscrivan@xxxxxxxxxx> 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