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diff --git a/include/sys/dmu_zfetch.h b/include/sys/dmu_zfetch.h
new file mode 100644
index 0000000..78cadd2
--- /dev/null
+++ b/include/sys/dmu_zfetch.h
@@ -0,0 +1,76 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (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 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_DFETCH_H
+#define	_DFETCH_H
+
+#include <sys/zfs_context.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+extern uint64_t	zfetch_array_rd_sz;
+
+struct dnode;				/* so we can reference dnode */
+
+typedef enum zfetch_dirn {
+	ZFETCH_FORWARD = 1,		/* prefetch increasing block numbers */
+	ZFETCH_BACKWARD	= -1		/* prefetch decreasing block numbers */
+} zfetch_dirn_t;
+
+typedef struct zstream {
+	uint64_t	zst_offset;	/* offset of starting block in range */
+	uint64_t	zst_len;	/* length of range, in blocks */
+	zfetch_dirn_t	zst_direction;	/* direction of prefetch */
+	uint64_t	zst_stride;	/* length of stride, in blocks */
+	uint64_t	zst_ph_offset;	/* prefetch offset, in blocks */
+	uint64_t	zst_cap;	/* prefetch limit (cap), in blocks */
+	kmutex_t	zst_lock;	/* protects stream */
+	clock_t		zst_last;	/* lbolt of last prefetch */
+	avl_node_t	zst_node;	/* embed avl node here */
+} zstream_t;
+
+typedef struct zfetch {
+	krwlock_t	zf_rwlock;	/* protects zfetch structure */
+	list_t		zf_stream;	/* AVL tree of zstream_t's */
+	struct dnode	*zf_dnode;	/* dnode that owns this zfetch */
+	uint32_t	zf_stream_cnt;	/* # of active streams */
+	uint64_t	zf_alloc_fail;	/* # of failed attempts to alloc strm */
+} zfetch_t;
+
+void		zfetch_init(void);
+void		zfetch_fini(void);
+
+void		dmu_zfetch_init(zfetch_t *, struct dnode *);
+void		dmu_zfetch_rele(zfetch_t *);
+void		dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _DFETCH_H */