Re: sd .img partition loop support

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case insensitive, I can see how that would be a problem.

Now that I understand that I'll stop trying to make it work
thank you.

On Tue, Oct 19, 2021 at 1:53 AM Amir Goldstein <amir73il@xxxxxxxxx> wrote:
>
> On Mon, Oct 18, 2021 at 9:46 PM Carl Karsten <carl@xxxxxxxxxxxxxxxx> wrote:
> >
> > I'm trying to overlay an empty upper dir onto a fat/loop/img fs and getting:
> >
> > juser@negk:~/boot$ sudo mount -o ro /dev/mapper/loop0p1 img
> > juser@negk:~/boot$ sudo mount -t overlay overlay
> > -olowerdir=img,upperdir=upper,workdir=work merged
> > mount: /home/juser/boot/merged: wrong fs type, bad option, bad superblock
> > on overlay, missing codepage or helper program, or other error.
> >
> > [ 2449.670177] overlayfs: filesystem on 'lower' not supported
> >
>
> fat was never supported as lower or upper layer AFAIK, see:
> https://lore.kernel.org/linux-unionfs/2527352.xHhNOModH5@nerdopolis/
>
> This is due to the case insensitive and special name encoding of fat.
> It is not unfixable, but it was never a priority for anyone to fix it.
>
> I suppose it would be easier for you to copy the image to another filesystem
> before constructing the overlay.
>
> Thanks,
> Amir.



-- 
Carl K



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