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-rw-r--r--uts/common/fs/zfs/sys/dmu_zfetch.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/sys/dmu_zfetch.h b/uts/common/fs/zfs/sys/dmu_zfetch.h
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index 000000000000..78cadd2b1ee1
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+++ b/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.
+ */
+
+#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 */