On Tue, 8 Dec 2020, 9:30 pm Qiyu Yan, <yanq...@fedoraproject.org> wrote:

> Since swapfile should always be NOCOW, while doing snapshot the subvol
> containing the file will definitely make it COW. You may want to put
> swapfile to a separate subvol.
>

How would you verify if a file is CoW in BTRFS?

>
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