[Bug 241070] dumpon: dumpon opens geom devices non-exclusively

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241070

            Bug ID: 241070
           Summary: dumpon: dumpon opens geom devices non-exclusively
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

dumpon opens geom devices non-exclusively.  This might be required in order to
share a device for swap and dump purposes.  However, it's also dangerous as it
allows a single device to be used as both a dump device and a storage device.

Steps to reproduce:

> sudo dumpon vtbd1
> sudo zpool create foo vtbd1

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