[Bug 242934] WISH: md(4) and mdconfig(8) should support offset for vnodes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242934

            Bug ID: 242934
           Summary: WISH: md(4) and mdconfig(8) should support offset for
                    vnodes
           Product: Base System
           Version: 11.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: feature
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mi at FreeBSD.org

In addition to size, it should be possible to also set the offset for
vnode-backed memory-disks.

For example, dealing with a corrupted disk-image, it may be useful to map the
uncorrupted section of it only -- to recover a filesystem on a partition.

Currently this requires using something like dd to make a copy of the desired
section. Seems like this can be improved with (relative) ease...

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