[Bug 261603] sysctl kern.vnode disabled in 2003, can we re-enable now?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261603

            Bug ID: 261603
           Summary: sysctl kern.vnode disabled in 2003, can we re-enable
                    now?
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: risner@stdio.com

sysctl kern.vnode was disabled in commit:
https://github.com/freebsd/freebsd-src/commit/acb18acfec97aa7fe26ff48f80a5c3f89c9b542d

At the time the concern was with diskless machines and general it may be
dangerous in its requirements for locked down memory on large RAM systems.

NetBSD and OpenBSD both appear to have kern.vnode from looking at lsof's
dialects. So it appears to be safe there in there implementation.

Currently the lsof team is waiting on this to be enabled to merge a change to
the FreeBSD dialect to use more ABI calls instead of /dev/kmem reads. That
leaves the FreeBSD port of lsof unable to read zfs file's locations. There may
be other ports that are difficult to maintain because this sysctl is disabled.

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