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34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
25 | #ifndef _SYS_ARC_H | |
26 | #define _SYS_ARC_H | |
27 | ||
34dc7c2f BB |
28 | #include <sys/zfs_context.h> |
29 | ||
30 | #ifdef __cplusplus | |
31 | extern "C" { | |
32 | #endif | |
33 | ||
34 | #include <sys/zio.h> | |
35 | #include <sys/dmu.h> | |
36 | #include <sys/spa.h> | |
ab26409d | 37 | #include <sys/refcount.h> |
34dc7c2f BB |
38 | |
39 | typedef struct arc_buf_hdr arc_buf_hdr_t; | |
40 | typedef struct arc_buf arc_buf_t; | |
ab26409d | 41 | typedef struct arc_prune arc_prune_t; |
34dc7c2f | 42 | typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); |
ab26409d | 43 | typedef void arc_prune_func_t(int64_t bytes, void *private); |
34dc7c2f BB |
44 | typedef int arc_evict_func_t(void *private); |
45 | ||
46 | /* generic arc_done_func_t's which you can use */ | |
47 | arc_done_func_t arc_bcopy_func; | |
48 | arc_done_func_t arc_getbuf_func; | |
49 | ||
ab26409d BB |
50 | /* generic arc_prune_func_t wrapper for callbacks */ |
51 | struct arc_prune { | |
52 | arc_prune_func_t *p_pfunc; | |
53 | void *p_private; | |
54 | list_node_t p_node; | |
55 | refcount_t p_refcnt; | |
56 | }; | |
57 | ||
34dc7c2f BB |
58 | struct arc_buf { |
59 | arc_buf_hdr_t *b_hdr; | |
60 | arc_buf_t *b_next; | |
428870ff BB |
61 | kmutex_t b_evict_lock; |
62 | krwlock_t b_data_lock; | |
34dc7c2f BB |
63 | void *b_data; |
64 | arc_evict_func_t *b_efunc; | |
65 | void *b_private; | |
66 | }; | |
67 | ||
68 | typedef enum arc_buf_contents { | |
69 | ARC_BUFC_DATA, /* buffer contains data */ | |
70 | ARC_BUFC_METADATA, /* buffer contains metadata */ | |
71 | ARC_BUFC_NUMTYPES | |
72 | } arc_buf_contents_t; | |
73 | /* | |
74 | * These are the flags we pass into calls to the arc | |
75 | */ | |
76 | #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ | |
77 | #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ | |
78 | #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ | |
79 | #define ARC_CACHED (1 << 4) /* I/O was already in cache */ | |
b128c09f | 80 | #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */ |
34dc7c2f | 81 | |
d164b209 BB |
82 | /* |
83 | * The following breakdows of arc_size exist for kstat only. | |
84 | */ | |
85 | typedef enum arc_space_type { | |
86 | ARC_SPACE_DATA, | |
87 | ARC_SPACE_HDRS, | |
88 | ARC_SPACE_L2HDRS, | |
89 | ARC_SPACE_OTHER, | |
90 | ARC_SPACE_NUMTYPES | |
91 | } arc_space_type_t; | |
92 | ||
93 | void arc_space_consume(uint64_t space, arc_space_type_t type); | |
94 | void arc_space_return(uint64_t space, arc_space_type_t type); | |
34dc7c2f BB |
95 | void *arc_data_buf_alloc(uint64_t space); |
96 | void arc_data_buf_free(void *buf, uint64_t space); | |
97 | arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, | |
98 | arc_buf_contents_t type); | |
9babb374 BB |
99 | arc_buf_t *arc_loan_buf(spa_t *spa, int size); |
100 | void arc_return_buf(arc_buf_t *buf, void *tag); | |
428870ff | 101 | void arc_loan_inuse_buf(arc_buf_t *buf, void *tag); |
34dc7c2f BB |
102 | void arc_buf_add_ref(arc_buf_t *buf, void *tag); |
103 | int arc_buf_remove_ref(arc_buf_t *buf, void *tag); | |
104 | int arc_buf_size(arc_buf_t *buf); | |
105 | void arc_release(arc_buf_t *buf, void *tag); | |
428870ff BB |
106 | int arc_release_bp(arc_buf_t *buf, void *tag, blkptr_t *bp, spa_t *spa, |
107 | zbookmark_t *zb); | |
34dc7c2f BB |
108 | int arc_released(arc_buf_t *buf); |
109 | int arc_has_callback(arc_buf_t *buf); | |
110 | void arc_buf_freeze(arc_buf_t *buf); | |
111 | void arc_buf_thaw(arc_buf_t *buf); | |
1eb5bfa3 | 112 | boolean_t arc_buf_eviction_needed(arc_buf_t *buf); |
34dc7c2f BB |
113 | #ifdef ZFS_DEBUG |
114 | int arc_referenced(arc_buf_t *buf); | |
115 | #endif | |
116 | ||
428870ff | 117 | int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, arc_buf_t *pbuf, |
b128c09f BB |
118 | arc_done_func_t *done, void *private, int priority, int zio_flags, |
119 | uint32_t *arc_flags, const zbookmark_t *zb); | |
428870ff | 120 | int arc_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
34dc7c2f | 121 | arc_done_func_t *done, void *private, int priority, int flags, |
b128c09f | 122 | uint32_t *arc_flags, const zbookmark_t *zb); |
428870ff BB |
123 | zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg, |
124 | blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp, | |
125 | arc_done_func_t *ready, arc_done_func_t *done, void *private, | |
126 | int priority, int zio_flags, const zbookmark_t *zb); | |
34dc7c2f | 127 | |
ab26409d BB |
128 | arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *private); |
129 | void arc_remove_prune_callback(arc_prune_t *p); | |
130 | ||
34dc7c2f BB |
131 | void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); |
132 | int arc_buf_evict(arc_buf_t *buf); | |
133 | ||
ab26409d | 134 | void arc_adjust_meta(int64_t adjustment, boolean_t may_prune); |
34dc7c2f BB |
135 | void arc_flush(spa_t *spa); |
136 | void arc_tempreserve_clear(uint64_t reserve); | |
137 | int arc_tempreserve_space(uint64_t reserve, uint64_t txg); | |
138 | ||
139 | void arc_init(void); | |
140 | void arc_fini(void); | |
141 | ||
142 | /* | |
143 | * Level 2 ARC | |
144 | */ | |
145 | ||
9babb374 | 146 | void l2arc_add_vdev(spa_t *spa, vdev_t *vd); |
34dc7c2f | 147 | void l2arc_remove_vdev(vdev_t *vd); |
b128c09f | 148 | boolean_t l2arc_vdev_present(vdev_t *vd); |
34dc7c2f BB |
149 | void l2arc_init(void); |
150 | void l2arc_fini(void); | |
b128c09f BB |
151 | void l2arc_start(void); |
152 | void l2arc_stop(void); | |
34dc7c2f | 153 | |
7df05a42 RY |
154 | /* Global tunings */ |
155 | extern int zfs_write_limit_shift; | |
156 | extern unsigned long zfs_write_limit_max; | |
157 | extern kmutex_t zfs_write_limit_lock; | |
158 | ||
34dc7c2f BB |
159 | #ifdef __cplusplus |
160 | } | |
161 | #endif | |
162 | ||
163 | #endif /* _SYS_ARC_H */ |