dmu_zfetch.h revision 299433 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * Copyright (c) 2014 by Delphix. All rights reserved.
28 */
29
30#ifndef	_DMU_ZFETCH_H
31#define	_DMU_ZFETCH_H
32
33#include <sys/zfs_context.h>
34
35#ifdef	__cplusplus
36extern "C" {
37#endif
38
39extern uint64_t	zfetch_array_rd_sz;
40
41struct dnode;				/* so we can reference dnode */
42
43typedef struct zstream {
44	uint64_t	zs_blkid;	/* expect next access at this blkid */
45	uint64_t	zs_pf_blkid;	/* next block to prefetch */
46
47	/*
48	 * We will next prefetch the L1 indirect block of this level-0
49	 * block id.
50	 */
51	uint64_t	zs_ipf_blkid;
52
53	kmutex_t	zs_lock;	/* protects stream */
54	hrtime_t	zs_atime;	/* time last prefetch issued */
55	list_node_t	zs_node;	/* link for zf_stream */
56} zstream_t;
57
58typedef struct zfetch {
59	krwlock_t	zf_rwlock;	/* protects zfetch structure */
60	list_t		zf_stream;	/* list of zstream_t's */
61	struct dnode	*zf_dnode;	/* dnode that owns this zfetch */
62} zfetch_t;
63
64void		zfetch_init(void);
65void		zfetch_fini(void);
66
67void		dmu_zfetch_init(zfetch_t *, struct dnode *);
68void		dmu_zfetch_fini(zfetch_t *);
69void		dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t);
70
71
72#ifdef	__cplusplus
73}
74#endif
75
76#endif	/* _DMU_ZFETCH_H */
77