Support custom build directories and move includes

[zfs.git] / include / sys / dmu_zfetch.h

diff --git a/include/sys/dmu_zfetch.h b/include/sys/dmu_zfetch.h
new file mode 100644 (file)
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--- /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 */