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>
38 typedef struct arc_buf_hdr arc_buf_hdr_t
;
39 typedef struct arc_buf arc_buf_t
;
40 typedef void arc_done_func_t(zio_t
*zio
, arc_buf_t
*buf
, void *private);
41 typedef int arc_evict_func_t(void *private);
43 /* generic arc_done_func_t's which you can use */
44 arc_done_func_t arc_bcopy_func
;
45 arc_done_func_t arc_getbuf_func
;
50 kmutex_t b_evict_lock
;
51 krwlock_t b_data_lock
;
53 arc_evict_func_t
*b_efunc
;
57 typedef enum arc_buf_contents
{
58 ARC_BUFC_DATA
, /* buffer contains data */
59 ARC_BUFC_METADATA
, /* buffer contains metadata */
63 * These are the flags we pass into calls to the arc
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 */
69 #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */
72 * The following breakdows of arc_size exist for kstat only.
74 typedef enum arc_space_type
{
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
);
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
);
88 arc_buf_t
*arc_loan_buf(spa_t
*spa
, int size
);
89 void arc_return_buf(arc_buf_t
*buf
, void *tag
);
90 void arc_loan_inuse_buf(arc_buf_t
*buf
, void *tag
);
91 void arc_buf_add_ref(arc_buf_t
*buf
, void *tag
);
92 int arc_buf_remove_ref(arc_buf_t
*buf
, void *tag
);
93 int arc_buf_size(arc_buf_t
*buf
);
94 void arc_release(arc_buf_t
*buf
, void *tag
);
95 int arc_release_bp(arc_buf_t
*buf
, void *tag
, blkptr_t
*bp
, spa_t
*spa
,
97 int arc_released(arc_buf_t
*buf
);
98 int arc_has_callback(arc_buf_t
*buf
);
99 void arc_buf_freeze(arc_buf_t
*buf
);
100 void arc_buf_thaw(arc_buf_t
*buf
);
102 int arc_referenced(arc_buf_t
*buf
);
105 int arc_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
, arc_buf_t
*pbuf
,
106 arc_done_func_t
*done
, void *private, int priority
, int zio_flags
,
107 uint32_t *arc_flags
, const zbookmark_t
*zb
);
108 int arc_read_nolock(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
109 arc_done_func_t
*done
, void *private, int priority
, int flags
,
110 uint32_t *arc_flags
, const zbookmark_t
*zb
);
111 zio_t
*arc_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
,
112 blkptr_t
*bp
, arc_buf_t
*buf
, boolean_t l2arc
, const zio_prop_t
*zp
,
113 arc_done_func_t
*ready
, arc_done_func_t
*done
, void *private,
114 int priority
, int zio_flags
, const zbookmark_t
*zb
);
116 void arc_set_callback(arc_buf_t
*buf
, arc_evict_func_t
*func
, void *private);
117 int arc_buf_evict(arc_buf_t
*buf
);
119 void arc_flush(spa_t
*spa
);
120 void arc_tempreserve_clear(uint64_t reserve
);
121 int arc_tempreserve_space(uint64_t reserve
, uint64_t txg
);
130 void l2arc_add_vdev(spa_t
*spa
, vdev_t
*vd
);
131 void l2arc_remove_vdev(vdev_t
*vd
);
132 boolean_t
l2arc_vdev_present(vdev_t
*vd
);
133 void l2arc_init(void);
134 void l2arc_fini(void);
135 void l2arc_start(void);
136 void l2arc_stop(void);
142 #endif /* _SYS_ARC_H */