[Bug 230220] UFS: the freezing ioctl (i.e.UFSSUSPEND) causes panic or EBUSY

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230220

--- Comment #10 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
You might want to look at the tool the ffs freeze mechanism was created for:
growfs(8).

There is no equivalent of fsfreeze(8), because it would be inherently
dangerous: you'd easily end up with a frozen machine that can only be
power-cycled.  With the current design you can safely ^C the utility and the
writes will unfreeze.

>From a big picture point of view, why is this required in the first place?  I
mean, why do you need to freeze the filesystems "from the inside" instead of
just pausing them in the hypervisor?

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