|Make the spec_node table implementation private to spec_vnops.c.
|To retrieve a spec_node, two new lookup functions (by device or by mount)
|are implemented. Both return a referenced vnode, for an opened block device
|the opened vnode is returned so further diagnostic checks "vp == ... sd_bdevvp"
|will not fire. Otherwise any vnode matching the criteria gets returned.
|No objections on tech-kern.
The effect was that ls /kernfs appeared empty in most cases.
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