clunk - forget about a fid
Tclunk tag  fid 
Rclunk tag  fid 
The clunk request informs the file server that the current file represented by fid is no longer needed by the client. The actual file is not removed on the server.
Once a fid has been clunk'ed, the same fid can be reused in a new clone request.
Even if the clunk returns an error, the fid is no longer valid.
A clunk message is generated when a file descriptor is closed (usually by the garbage collector) and indirectly by other actions such as failed open calls.
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