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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 2006 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
26 | #ifndef _DFETCH_H | |
27 | #define _DFETCH_H | |
28 | ||
29 | #pragma ident "@(#)dmu_zfetch.h 1.2 06/07/17 SMI" | |
30 | ||
31 | #include <sys/zfs_context.h> | |
32 | ||
33 | #ifdef __cplusplus | |
34 | extern "C" { | |
35 | #endif | |
36 | ||
37 | extern uint64_t zfetch_array_rd_sz; | |
38 | ||
39 | struct dnode; /* so we can reference dnode */ | |
40 | ||
41 | typedef enum zfetch_dirn { | |
42 | ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */ | |
43 | ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */ | |
44 | } zfetch_dirn_t; | |
45 | ||
46 | typedef struct zstream { | |
47 | uint64_t zst_offset; /* offset of starting block in range */ | |
48 | uint64_t zst_len; /* length of range, in blocks */ | |
49 | zfetch_dirn_t zst_direction; /* direction of prefetch */ | |
50 | uint64_t zst_stride; /* length of stride, in blocks */ | |
51 | uint64_t zst_ph_offset; /* prefetch offset, in blocks */ | |
52 | uint64_t zst_cap; /* prefetch limit (cap), in blocks */ | |
53 | kmutex_t zst_lock; /* protects stream */ | |
54 | clock_t zst_last; /* lbolt of last prefetch */ | |
55 | avl_node_t zst_node; /* embed avl node here */ | |
56 | } zstream_t; | |
57 | ||
58 | typedef struct zfetch { | |
59 | krwlock_t zf_rwlock; /* protects zfetch structure */ | |
60 | list_t zf_stream; /* AVL tree of zstream_t's */ | |
61 | struct dnode *zf_dnode; /* dnode that owns this zfetch */ | |
62 | uint32_t zf_stream_cnt; /* # of active streams */ | |
63 | uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */ | |
64 | } zfetch_t; | |
65 | ||
66 | void dmu_zfetch_init(zfetch_t *, struct dnode *); | |
67 | void dmu_zfetch_rele(zfetch_t *); | |
68 | void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int); | |
69 | ||
70 | ||
71 | #ifdef __cplusplus | |
72 | } | |
73 | #endif | |
74 | ||
75 | #endif /* _DFETCH_H */ |