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From: root@ubh.homeip.net (Charlie Root)
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Subject: nullfs, delete files and behaves super slow
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Moving a file to or from a nullfs mounted part of a filesystem to another
location within the same filesystem results in a complete file copying.

More severe is that  is if I move a file from one place to another
where the two places is the same (one mounted with mount_nullfs) the
file disappear.