- version messageprocedure
The version request corresponds to a 9P Tversion request. The message is a list of two elements; the first is the maximum message size the client supports, and the second is a protocol version string indicating what version of the 9P protocol is expected (my Linux system sends "9P2000.u")
The handler must return a block size which is less than or equal to that requested by the client.
The default implementation just returns the block size requested by the client.