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diff --git a/lib/libspl/include/rpc/xdr.h b/lib/libspl/include/rpc/xdr.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License"). You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ *
+ * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
+ * All Rights Reserved
+ *
+ * Portions of this source code were derived from Berkeley 4.3 BSD
+ * under license from the Regents of the University of California.
+ */
+
+#ifndef LIBSPL_RPC_XDR_H
+#define LIBSPL_RPC_XDR_H
+
+#include_next <rpc/xdr.h>
+
+/*
+ * These are XDR control operators
+ */
+
+#define XDR_GET_BYTES_AVAIL 1
+
+typedef struct xdr_bytesrec {
+ bool_t xc_is_last_record;
+ size_t xc_num_avail;
+} xdr_bytesrec_t;
+
+/*
+ * These are the request arguments to XDR_CONTROL.
+ *
+ * XDR_PEEK - returns the contents of the next XDR unit on the XDR stream.
+ * XDR_SKIPBYTES - skips the next N bytes in the XDR stream.
+ * XDR_RDMAGET - for xdr implementation over RDMA, gets private flags from
+ * the XDR stream being moved over RDMA
+ * XDR_RDMANOCHUNK - for xdr implementaion over RDMA, sets private flags in
+ * the XDR stream moving over RDMA.
+ */
+#define XDR_PEEK 2
+#define XDR_SKIPBYTES 3
+#define XDR_RDMAGET 4
+#define XDR_RDMASET 5
+
+extern bool_t xdr_control(XDR *xdrs, int request, void *info);
+
+#endif