[Bug 192948] New: autofs: issues with mv and rename

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192948

            Bug ID: 192948
           Summary: autofs: issues with mv and rename
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: davidjx8p at gmail.com

With an autofs map for /home and my home directory, /home/david, autofs-mounted
with a nullfs mount, I experience (and this has been confirmed by trasz as
happening to him too) issues with mv and rename when the path provided
traverses through the top level of the autofs-mounted filesystem (in this case,
/home/david). This does happen when the directory is mounted.

For example: if we're in working directory /home/david, and our mount output
looks like this:

map auto_home on /home (autofs)
/export/home/david on /home/david (nullfs, local, automounted)

then we can do mv oldfile newfile, and that will work. But if we try mv
../david/oldfile ../david/newfile, or mv /home/david/oldfile
/home/david/newfile, it will give an error: "Operation Not Supported".

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