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7bdf406d TG |
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 | ||
0bd31011 TG |
26 | #ifndef _DFETCH_H |
27 | #define _DFETCH_H | |
7bdf406d TG |
28 | |
29 | #include <sys/zfs_context.h> | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | extern unsigned long zfetch_array_rd_sz; | |
36 | ||
37 | struct dnode; /* so we can reference dnode */ | |
38 | ||
0bd31011 TG |
39 | typedef enum zfetch_dirn { |
40 | ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */ | |
41 | ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */ | |
42 | } zfetch_dirn_t; | |
51d97d8f | 43 | |
0bd31011 TG |
44 | typedef struct zstream { |
45 | uint64_t zst_offset; /* offset of starting block in range */ | |
46 | uint64_t zst_len; /* length of range, in blocks */ | |
47 | zfetch_dirn_t zst_direction; /* direction of prefetch */ | |
48 | uint64_t zst_stride; /* length of stride, in blocks */ | |
49 | uint64_t zst_ph_offset; /* prefetch offset, in blocks */ | |
50 | uint64_t zst_cap; /* prefetch limit (cap), in blocks */ | |
51 | kmutex_t zst_lock; /* protects stream */ | |
52 | clock_t zst_last; /* lbolt of last prefetch */ | |
53 | list_node_t zst_node; /* next zstream here */ | |
7bdf406d TG |
54 | } zstream_t; |
55 | ||
56 | typedef struct zfetch { | |
57 | krwlock_t zf_rwlock; /* protects zfetch structure */ | |
0bd31011 | 58 | list_t zf_stream; /* AVL tree of zstream_t's */ |
7bdf406d | 59 | struct dnode *zf_dnode; /* dnode that owns this zfetch */ |
0bd31011 TG |
60 | uint32_t zf_stream_cnt; /* # of active streams */ |
61 | uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */ | |
7bdf406d TG |
62 | } zfetch_t; |
63 | ||
64 | void zfetch_init(void); | |
65 | void zfetch_fini(void); | |
66 | ||
67 | void dmu_zfetch_init(zfetch_t *, struct dnode *); | |
0bd31011 TG |
68 | void dmu_zfetch_rele(zfetch_t *); |
69 | void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int); | |
7bdf406d TG |
70 | |
71 | ||
72 | #ifdef __cplusplus | |
73 | } | |
74 | #endif | |
75 | ||
0bd31011 | 76 | #endif /* _DFETCH_H */ |