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 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
29 #include <sys/zfs_context.h>
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);
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;
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 */
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);
86 int arc_referenced(arc_buf_t *buf);
89 typedef struct writeprops {
90 dmu_object_type_t wp_type;
93 uint8_t wp_dncompress, wp_oscompress;
94 uint8_t wp_dnchecksum, wp_oschecksum;
97 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_buf_t *pbuf,
98 arc_done_func_t *done, void *private, int priority, int zio_flags,
99 uint32_t *arc_flags, const zbookmark_t *zb);
100 int arc_read_nolock(zio_t *pio, spa_t *spa, blkptr_t *bp,
101 arc_done_func_t *done, void *private, int priority, int flags,
102 uint32_t *arc_flags, const zbookmark_t *zb);
103 zio_t *arc_write(zio_t *pio, spa_t *spa, const writeprops_t *wp,
104 boolean_t l2arc, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
105 arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority,
106 int zio_flags, const zbookmark_t *zb);
107 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
108 zio_done_func_t *done, void *private, uint32_t arc_flags);
109 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data);
111 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
112 int arc_buf_evict(arc_buf_t *buf);
114 void arc_flush(spa_t *spa);
115 void arc_tempreserve_clear(uint64_t reserve);
116 int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
125 void l2arc_add_vdev(spa_t *spa, vdev_t *vd, uint64_t start, uint64_t end);
126 void l2arc_remove_vdev(vdev_t *vd);
127 boolean_t l2arc_vdev_present(vdev_t *vd);
128 void l2arc_init(void);
129 void l2arc_fini(void);
130 void l2arc_start(void);
131 void l2arc_stop(void);
137 #endif /* _SYS_ARC_H */