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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 | /* | |
d164b209 | 22 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
26 | #ifndef _SYS_ARC_H | |
27 | #define _SYS_ARC_H | |
28 | ||
34dc7c2f BB |
29 | #include <sys/zfs_context.h> |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | #include <sys/zio.h> | |
36 | #include <sys/dmu.h> | |
37 | #include <sys/spa.h> | |
38 | ||
39 | typedef struct arc_buf_hdr arc_buf_hdr_t; | |
40 | typedef struct arc_buf arc_buf_t; | |
41 | typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); | |
42 | typedef int arc_evict_func_t(void *private); | |
43 | ||
44 | /* generic arc_done_func_t's which you can use */ | |
45 | arc_done_func_t arc_bcopy_func; | |
46 | arc_done_func_t arc_getbuf_func; | |
47 | ||
48 | struct arc_buf { | |
49 | arc_buf_hdr_t *b_hdr; | |
50 | arc_buf_t *b_next; | |
b128c09f | 51 | krwlock_t b_lock; |
34dc7c2f BB |
52 | void *b_data; |
53 | arc_evict_func_t *b_efunc; | |
54 | void *b_private; | |
55 | }; | |
56 | ||
57 | typedef enum arc_buf_contents { | |
58 | ARC_BUFC_DATA, /* buffer contains data */ | |
59 | ARC_BUFC_METADATA, /* buffer contains metadata */ | |
60 | ARC_BUFC_NUMTYPES | |
61 | } arc_buf_contents_t; | |
62 | /* | |
63 | * These are the flags we pass into calls to the arc | |
64 | */ | |
65 | #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ | |
66 | #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ | |
67 | #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ | |
68 | #define ARC_CACHED (1 << 4) /* I/O was already in cache */ | |
b128c09f | 69 | #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */ |
34dc7c2f | 70 | |
d164b209 BB |
71 | /* |
72 | * The following breakdows of arc_size exist for kstat only. | |
73 | */ | |
74 | typedef enum arc_space_type { | |
75 | ARC_SPACE_DATA, | |
76 | ARC_SPACE_HDRS, | |
77 | ARC_SPACE_L2HDRS, | |
78 | ARC_SPACE_OTHER, | |
79 | ARC_SPACE_NUMTYPES | |
80 | } arc_space_type_t; | |
81 | ||
82 | void arc_space_consume(uint64_t space, arc_space_type_t type); | |
83 | void arc_space_return(uint64_t space, arc_space_type_t type); | |
34dc7c2f BB |
84 | void *arc_data_buf_alloc(uint64_t space); |
85 | void arc_data_buf_free(void *buf, uint64_t space); | |
86 | arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, | |
87 | arc_buf_contents_t type); | |
9babb374 BB |
88 | arc_buf_t *arc_loan_buf(spa_t *spa, int size); |
89 | void arc_return_buf(arc_buf_t *buf, void *tag); | |
34dc7c2f BB |
90 | void arc_buf_add_ref(arc_buf_t *buf, void *tag); |
91 | int arc_buf_remove_ref(arc_buf_t *buf, void *tag); | |
92 | int arc_buf_size(arc_buf_t *buf); | |
93 | void arc_release(arc_buf_t *buf, void *tag); | |
94 | int arc_released(arc_buf_t *buf); | |
95 | int arc_has_callback(arc_buf_t *buf); | |
96 | void arc_buf_freeze(arc_buf_t *buf); | |
97 | void arc_buf_thaw(arc_buf_t *buf); | |
98 | #ifdef ZFS_DEBUG | |
99 | int arc_referenced(arc_buf_t *buf); | |
100 | #endif | |
101 | ||
b128c09f BB |
102 | typedef struct writeprops { |
103 | dmu_object_type_t wp_type; | |
104 | uint8_t wp_level; | |
105 | uint8_t wp_copies; | |
106 | uint8_t wp_dncompress, wp_oscompress; | |
107 | uint8_t wp_dnchecksum, wp_oschecksum; | |
108 | } writeprops_t; | |
109 | ||
110 | void write_policy(spa_t *spa, const writeprops_t *wp, zio_prop_t *zp); | |
111 | int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_buf_t *pbuf, | |
112 | arc_done_func_t *done, void *private, int priority, int zio_flags, | |
113 | uint32_t *arc_flags, const zbookmark_t *zb); | |
114 | int arc_read_nolock(zio_t *pio, spa_t *spa, blkptr_t *bp, | |
34dc7c2f | 115 | arc_done_func_t *done, void *private, int priority, int flags, |
b128c09f BB |
116 | uint32_t *arc_flags, const zbookmark_t *zb); |
117 | zio_t *arc_write(zio_t *pio, spa_t *spa, const writeprops_t *wp, | |
118 | boolean_t l2arc, uint64_t txg, blkptr_t *bp, arc_buf_t *buf, | |
34dc7c2f | 119 | arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority, |
b128c09f | 120 | int zio_flags, const zbookmark_t *zb); |
34dc7c2f BB |
121 | int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
122 | zio_done_func_t *done, void *private, uint32_t arc_flags); | |
123 | int arc_tryread(spa_t *spa, blkptr_t *bp, void *data); | |
124 | ||
125 | void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); | |
126 | int arc_buf_evict(arc_buf_t *buf); | |
127 | ||
128 | void arc_flush(spa_t *spa); | |
129 | void arc_tempreserve_clear(uint64_t reserve); | |
130 | int arc_tempreserve_space(uint64_t reserve, uint64_t txg); | |
131 | ||
132 | void arc_init(void); | |
133 | void arc_fini(void); | |
134 | ||
135 | /* | |
136 | * Level 2 ARC | |
137 | */ | |
138 | ||
9babb374 | 139 | void l2arc_add_vdev(spa_t *spa, vdev_t *vd); |
34dc7c2f | 140 | void l2arc_remove_vdev(vdev_t *vd); |
b128c09f | 141 | boolean_t l2arc_vdev_present(vdev_t *vd); |
34dc7c2f BB |
142 | void l2arc_init(void); |
143 | void l2arc_fini(void); | |
b128c09f BB |
144 | void l2arc_start(void); |
145 | void l2arc_stop(void); | |
34dc7c2f BB |
146 | |
147 | #ifdef __cplusplus | |
148 | } | |
149 | #endif | |
150 | ||
151 | #endif /* _SYS_ARC_H */ |