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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 2008 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
26 | #ifndef _SYS_ARC_H | |
27 | #define _SYS_ARC_H | |
28 | ||
29 | #pragma ident "@(#)arc.h 1.12 08/03/20 SMI" | |
30 | ||
31 | #include <sys/zfs_context.h> | |
32 | ||
33 | #ifdef __cplusplus | |
34 | extern "C" { | |
35 | #endif | |
36 | ||
37 | #include <sys/zio.h> | |
38 | #include <sys/dmu.h> | |
39 | #include <sys/spa.h> | |
40 | ||
41 | typedef struct arc_buf_hdr arc_buf_hdr_t; | |
42 | typedef struct arc_buf arc_buf_t; | |
43 | typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); | |
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 | ||
50 | struct arc_buf { | |
51 | arc_buf_hdr_t *b_hdr; | |
52 | arc_buf_t *b_next; | |
53 | void *b_data; | |
54 | arc_evict_func_t *b_efunc; | |
55 | void *b_private; | |
56 | }; | |
57 | ||
58 | typedef enum arc_buf_contents { | |
59 | ARC_BUFC_DATA, /* buffer contains data */ | |
60 | ARC_BUFC_METADATA, /* buffer contains metadata */ | |
61 | ARC_BUFC_NUMTYPES | |
62 | } arc_buf_contents_t; | |
63 | /* | |
64 | * These are the flags we pass into calls to the arc | |
65 | */ | |
66 | #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ | |
67 | #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ | |
68 | #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ | |
69 | #define ARC_CACHED (1 << 4) /* I/O was already in cache */ | |
70 | ||
71 | void arc_space_consume(uint64_t space); | |
72 | void arc_space_return(uint64_t space); | |
73 | void *arc_data_buf_alloc(uint64_t space); | |
74 | void arc_data_buf_free(void *buf, uint64_t space); | |
75 | arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, | |
76 | arc_buf_contents_t type); | |
77 | void arc_buf_add_ref(arc_buf_t *buf, void *tag); | |
78 | int arc_buf_remove_ref(arc_buf_t *buf, void *tag); | |
79 | int arc_buf_size(arc_buf_t *buf); | |
80 | void arc_release(arc_buf_t *buf, void *tag); | |
81 | int arc_released(arc_buf_t *buf); | |
82 | int arc_has_callback(arc_buf_t *buf); | |
83 | void arc_buf_freeze(arc_buf_t *buf); | |
84 | void arc_buf_thaw(arc_buf_t *buf); | |
85 | #ifdef ZFS_DEBUG | |
86 | int arc_referenced(arc_buf_t *buf); | |
87 | #endif | |
88 | ||
89 | int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap, | |
90 | arc_done_func_t *done, void *private, int priority, int flags, | |
91 | uint32_t *arc_flags, zbookmark_t *zb); | |
92 | zio_t *arc_write(zio_t *pio, spa_t *spa, int checksum, int compress, | |
93 | int ncopies, uint64_t txg, blkptr_t *bp, arc_buf_t *buf, | |
94 | arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority, | |
95 | int flags, zbookmark_t *zb); | |
96 | int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, | |
97 | zio_done_func_t *done, void *private, uint32_t arc_flags); | |
98 | int arc_tryread(spa_t *spa, blkptr_t *bp, void *data); | |
99 | ||
100 | void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); | |
101 | int arc_buf_evict(arc_buf_t *buf); | |
102 | ||
103 | void arc_flush(spa_t *spa); | |
104 | void arc_tempreserve_clear(uint64_t reserve); | |
105 | int arc_tempreserve_space(uint64_t reserve, uint64_t txg); | |
106 | ||
107 | void arc_init(void); | |
108 | void arc_fini(void); | |
109 | ||
110 | /* | |
111 | * Level 2 ARC | |
112 | */ | |
113 | ||
114 | void l2arc_add_vdev(spa_t *spa, vdev_t *vd, uint64_t start, uint64_t end); | |
115 | void l2arc_remove_vdev(vdev_t *vd); | |
116 | void l2arc_init(void); | |
117 | void l2arc_fini(void); | |
118 | ||
119 | #ifdef __cplusplus | |
120 | } | |
121 | #endif | |
122 | ||
123 | #endif /* _SYS_ARC_H */ |