'How to force background process, intercepting ctrl-z?

I have a btrfs command that intercepts Ctrl-Z, so I normally run it as

# btrfs command &

Well, today I forgot to add the & and I can't Ctrl Z the process. I don't need to stop the process. How do I make it go into the background?

I thought this should be simple, but for some reason it doesn't seem to be simple.

bash shell process

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