how to resize a zvol (legacy version of zfs)

[tech-lists]

Hi,

I have a bhyve instance mounted on a zvol on a freebsd-12-stable host. I'm not
using any special tool to manage the bhyve apart from screen.

How can I resize the bhyve instance wihtout making it unusable? The zol is
64GB and I'd like to make it 256GB.

thanks,
-- 
J.
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