NFS write transfers stay in the door if file removed while being transferred

[kofemann]

When the file is removed while being transferred, then NFS door will never receive CLOSE and the transfer stays in the NFS door. The following diagram visualizes the issue:

sequenceDiagram
    client1->>+nfsDoor: CREATE 'foo'
    nfsDoor-->>client1: OK
    client1->>+nfsDoor: WRITE
    nfsDoor-->>client1: OK
    client2->>+nfsDoor: DELETE 'foo'
    nfsDoor-->>client2: OK
    client1->>+nfsDoor: GETATTR+CLOSE
    nfsDoor-->>client1: File not found (GETATTR)

Arter receiving ENOENT client1 will not send CLOSE any more.