[Bug 221906] sys/cddl: Allow to modify the ZFS deadman sysctls after the system is up

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221906

            Bug ID: 221906
           Summary: sys/cddl: Allow to modify the ZFS deadman sysctls
                    after the system is up
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fk at fabiankeil.de
             Flags: mfc-stable11?

Created attachment 185875
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185875&action=edit
sys/cddl: Allow to modify the ZFS deadman sysctls after the system is up

The attached patch changes the ZFS deadman sysctls from CTLFLAG_RDTUN
to CTLFLAG_RWTUN so they can be changed after the system is up.

There does not seem to be a technical reason why it shouldn't
be done and being able to temporarily disable the deadman
is useful when importing a pool that is backed by remote
storage (such as ggated running as onion service).

Obtained from: ElectroBSD

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