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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
28 #include <sys/zfs_context.h>
37 #include <sys/refcount.h>
39 typedef struct arc_buf_hdr arc_buf_hdr_t
;
40 typedef struct arc_buf arc_buf_t
;
41 typedef struct arc_prune arc_prune_t
;
42 typedef void arc_done_func_t(zio_t
*zio
, arc_buf_t
*buf
, void *private);
43 typedef void arc_prune_func_t(int64_t bytes
, void *private);
44 typedef int arc_evict_func_t(void *private);
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
;
50 /* generic arc_prune_func_t wrapper for callbacks */
52 arc_prune_func_t
*p_pfunc
;
61 kmutex_t b_evict_lock
;
62 krwlock_t b_data_lock
;
64 arc_evict_func_t
*b_efunc
;
68 typedef enum arc_buf_contents
{
69 ARC_BUFC_DATA
, /* buffer contains data */
70 ARC_BUFC_METADATA
, /* buffer contains metadata */
74 * These are the flags we pass into calls to the arc
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 */
80 #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */
83 * The following breakdows of arc_size exist for kstat only.
85 typedef enum arc_space_type
{
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
);
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
);
99 arc_buf_t
*arc_loan_buf(spa_t
*spa
, int size
);
100 void arc_return_buf(arc_buf_t
*buf
, void *tag
);
101 void arc_loan_inuse_buf(arc_buf_t
*buf
, void *tag
);
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
);
106 int arc_release_bp(arc_buf_t
*buf
, void *tag
, blkptr_t
*bp
, spa_t
*spa
,
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
);
113 int arc_referenced(arc_buf_t
*buf
);
116 int arc_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
, arc_buf_t
*pbuf
,
117 arc_done_func_t
*done
, void *private, int priority
, int zio_flags
,
118 uint32_t *arc_flags
, const zbookmark_t
*zb
);
119 int arc_read_nolock(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
120 arc_done_func_t
*done
, void *private, int priority
, int flags
,
121 uint32_t *arc_flags
, const zbookmark_t
*zb
);
122 zio_t
*arc_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
,
123 blkptr_t
*bp
, arc_buf_t
*buf
, boolean_t l2arc
, const zio_prop_t
*zp
,
124 arc_done_func_t
*ready
, arc_done_func_t
*done
, void *private,
125 int priority
, int zio_flags
, const zbookmark_t
*zb
);
127 arc_prune_t
*arc_add_prune_callback(arc_prune_func_t
*func
, void *private);
128 void arc_remove_prune_callback(arc_prune_t
*p
);
130 void arc_set_callback(arc_buf_t
*buf
, arc_evict_func_t
*func
, void *private);
131 int arc_buf_evict(arc_buf_t
*buf
);
133 void arc_adjust_meta(int64_t adjustment
, boolean_t may_prune
);
134 void arc_flush(spa_t
*spa
);
135 void arc_tempreserve_clear(uint64_t reserve
);
136 int arc_tempreserve_space(uint64_t reserve
, uint64_t txg
);
145 void l2arc_add_vdev(spa_t
*spa
, vdev_t
*vd
);
146 void l2arc_remove_vdev(vdev_t
*vd
);
147 boolean_t
l2arc_vdev_present(vdev_t
*vd
);
148 void l2arc_init(void);
149 void l2arc_fini(void);
150 void l2arc_start(void);
151 void l2arc_stop(void);
157 #endif /* _SYS_ARC_H */