I don't know this area of the code at all well, but as I understand
it, there's been some work in the kernel (swap over NFS) which lays
down some of the underlying infrastructure we'd need to support
swapfiles on btrfs, but we don't have anything beyond that. I don't
know of anyone working on it, either.
Hugo.
You can use swapfile on btrfs with mounting it via a loop device. It
won't be incredibly fast, but it will work.
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