1 files changed, 76 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dmu_zfetch.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dmu_zfetch.h
new file mode 100644
index 000000000000..21a3ff3a2032
--- /dev/null
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/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.
+ */
+
+/*
+ * Copyright (c) 2014 by Delphix. All rights reserved.
+ */
+
+#ifndef	_DMU_ZFETCH_H
+#define	_DMU_ZFETCH_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 struct zstream {
+	uint64_t	zs_blkid;	/* expect next access at this blkid */
+	uint64_t	zs_pf_blkid;	/* next block to prefetch */
+
+	/*
+	 * We will next prefetch the L1 indirect block of this level-0
+	 * block id.
+	 */
+	uint64_t	zs_ipf_blkid;
+
+	kmutex_t	zs_lock;	/* protects stream */
+	hrtime_t	zs_atime;	/* time last prefetch issued */
+	list_node_t	zs_node;	/* link for zf_stream */
+} zstream_t;
+
+typedef struct zfetch {
+	krwlock_t	zf_rwlock;	/* protects zfetch structure */
+	list_t		zf_stream;	/* list of zstream_t's */
+	struct dnode	*zf_dnode;	/* dnode that owns this zfetch */
+} zfetch_t;
+
+void		zfetch_init(void);
+void		zfetch_fini(void);
+
+void		dmu_zfetch_init(zfetch_t *, struct dnode *);
+void		dmu_zfetch_fini(zfetch_t *);
+void		dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _DMU_ZFETCH_H */