return this.ctx.getConfig();
    }

    private synchronized SmbTreeImpl getTree() {
        final SmbTreeImpl t = this.tree;
        if (t != null) {
            return t.acquire(false);
        }
        if (this.delegate != null) {
            this.tree = this.delegate.getTree();
            return this.tree;
        }
        return t;
    }

    /**
     * @return

        SmbPipeInputStream stream = newStreamWithMinimalStubs(true);

        // Arrange mocks for available()
        when(handle.ensureOpen()).thenReturn(fd);
        when(fd.getTree()).thenReturn(tree);
        when(tree.isSMB2()).thenReturn(true);
        when(tree.getConfig()).thenReturn(config);
        when(config.getTransactionBufferSize()).thenReturn(65535);

    // Prepare SMB2 flow with a given response
    private void setupSmb2(NotifyResponse resp, byte[] fileId) throws Exception {
        when(handle.isValid()).thenReturn(true);
        when(handle.getTree()).thenReturn(tree);
        when(tree.isSMB2()).thenReturn(true);
        when(tree.getConfig()).thenReturn(mock(Configuration.class));
        when(handle.getFileId()).thenReturn(fileId);

    }

    @Test
    @DisplayName("getTree() acquires and returns same tree instance")
    void getTree_acquiresAndReturnsTree() {
        when(cfg.isTraceResourceUsage()).thenReturn(false);
        stubValidTree(7L, true, true);

        SmbFileHandleImpl h = new SmbFileHandleImpl(cfg, 123, tree, "//server/share", 0, 0, 0, 0, 0L);

        SmbTreeHandleImpl t1 = h.getTree();
        SmbTreeHandleImpl t2 = h.getTree();

        when(fileHandle.acquire()).thenReturn(fileHandle);
        when(fileHandle.isValid()).thenReturn(true);
        when(fileHandle.getTree()).thenReturn(tree);

        // Initially not open (isStale returns false when handle is null, not true)
        assertFalse(target.isOpen());
        assertFalse(target.isStale());

        when(fh.acquire()).thenReturn(fh);
        lenient().when(fh.isValid()).thenReturn(true);
        lenient().when(fh.getTree()).thenReturn(tree);
        when(fh.getFileId()).thenReturn(new byte[16]);

        // Setup for ioctl request
        when(tree.send(any(Smb2IoctlRequest.class), eq(RequestParam.NO_RETRY))).thenReturn(ioctlResp);

        when(file.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(fh);
        when(fh.acquire()).thenReturn(fh);
        when(fh.isValid()).thenReturn(true);
        when(fh.getTree()).thenReturn(tree);
        when(fh.getFileId()).thenReturn(new byte[16]);
        when(fh.getFid()).thenReturn(1);

        // build via package-private constructor to control unshared flag

        if (len <= 0) {
            return 0;
        }
        final long start = this.fp;

        try (SmbFileHandleImpl fh = ensureOpen(); SmbTreeHandleImpl th = fh.getTree()) {

            int r, n;
            final SmbComReadAndXResponse response = new SmbComReadAndXResponse(th.getConfig(), b, off);
            do {
                r = len > this.readSize ? this.readSize : len;

                }
                
                // Send create request
                Smb2CreateResponse response = (Smb2CreateResponse) 
                    file.getTree().send(createReq);
                
                if (response.isSuccess()) {
                    // Update file with new handle
                    file.setFileId(response.getFileId());

    @Override
    public int sendrecv(final byte[] buf, final int off, final int length, final byte[] inB, final int maxRecvSize) throws IOException {
        try (SmbFileHandleImpl fh = ensureOpen(); SmbTreeHandleImpl th = fh.getTree()) {

            if (th.isSMB2()) {
                final Smb2IoctlRequest req =
                        new Smb2IoctlRequest(th.getConfig(), Smb2IoctlRequest.FSCTL_PIPE_TRANSCEIVE, fh.getFileId(), inB);