(Sending to both tech-kern and tech-userlevel since I don't know which
part contains the responsible change.  Please feel free to trim the
list when following up with stuff relevant to only one of the two.)

Traditionally, on NetBSD (and on older BSDs), df on a disk device has
shown space on the filesystem on that device, even if the device is not
mounted anywhere at the time.

Doesn't work that way on 2.0; instead, it shows the space on the
filesystem holding the special device file (typically /).

Is this a bug (and thus worth sending-pr), a feature (??), an
unfortunate side effect of something considered more important, or
what?  It's annoying to have to mount a filesystem just to find out how
much space is free on it.

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