2008-11-20 23:01:55 +03:00
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _DFETCH_H
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#define _DFETCH_H
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2008-12-03 23:09:06 +03:00
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#pragma ident "%Z%%M% %I% %E% SMI"
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2008-11-20 23:01:55 +03:00
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern uint64_t zfetch_array_rd_sz;
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struct dnode; /* so we can reference dnode */
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typedef enum zfetch_dirn {
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ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */
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ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */
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} zfetch_dirn_t;
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typedef struct zstream {
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uint64_t zst_offset; /* offset of starting block in range */
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uint64_t zst_len; /* length of range, in blocks */
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zfetch_dirn_t zst_direction; /* direction of prefetch */
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uint64_t zst_stride; /* length of stride, in blocks */
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uint64_t zst_ph_offset; /* prefetch offset, in blocks */
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uint64_t zst_cap; /* prefetch limit (cap), in blocks */
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kmutex_t zst_lock; /* protects stream */
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clock_t zst_last; /* lbolt of last prefetch */
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avl_node_t zst_node; /* embed avl node here */
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} zstream_t;
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typedef struct zfetch {
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krwlock_t zf_rwlock; /* protects zfetch structure */
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list_t zf_stream; /* AVL tree of zstream_t's */
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struct dnode *zf_dnode; /* dnode that owns this zfetch */
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uint32_t zf_stream_cnt; /* # of active streams */
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uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */
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} zfetch_t;
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void dmu_zfetch_init(zfetch_t *, struct dnode *);
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void dmu_zfetch_rele(zfetch_t *);
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void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DFETCH_H */
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