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Anderson Rosenberg:
>      3. create-snapshot must respect rw="False".
> 
> Otherwise, create-snapshot fails for large images (>~2 GB) such as
> templates under volatile dom0. For images tagged as rw="False", 
> https://github.com/QubesOS/qubes-core-admin/blob/main/linux/system-config/create-snapshot
> should invoke losetup with the --readonly flag. The condition is to
> be identified within 
> https://github.com/QubesOS/qubes-core-admin/blob/main/qubes/storage/file.py
> and passed to create-snapshot as a commandline argument. Since
> readonly images must not be modified, this should not contain any
> breaking changes and can be seamlessly implemented without opt-in
> flags.

Can you switch to the 'file-reflink' storage driver? The legacy 'file'
storage driver is deprecated and due to be ripped out:

https://github.com/QubesOS/qubes-issues/issues/6399

Rusty
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