Re: [QUESTION] Why overlayfs cannot mounted as nfs_export and metacopy?

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On Sat, Aug 7, 2021 at 1:17 PM Zhihao Cheng <chengzhihao1@xxxxxxxxxx> wrote:
>
> Hi, all.
>
> As title said. I wonder to know the reason for overlayfs mount failure
> with '-o nfs_export=on,metacopy=on'.
>
> I modified kernel to enable these two options 'on',  it looks like that
> overlayfs can still work fine under nfs_v4.
>
> Besides, I can get no more information about the reason from source
> code, maybe I missed something.
>

It's because ovl_obtain_alias() (decoding a disconnected non-dir file handle)
does not know how to construct a metacopy overlayfs inode.

Maybe Vivek will be able to point you to the discussion that lead to making
the features mutually exclusive.

I don't remember any other reason.

Thanks,
Amir.



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