clone - duplicate a fid
Tclone tag  fid  newfid 
Rclone tag  fid 
The Tclone request carries as arguments an existing fid and a proposed newfid (which must not be in use) that the client wishes to associate with the same file as fid. The fid must be valid in the current session and must not have been opened for I/O by an open or create message. After a successful clone, and before any subsequent messages, fid and newfid are indistinguishable.
A clone message is generated by any system call that evaluates a path name and by a read of a union directory.
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