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 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
29 #pragma ident "%Z%%M% %I% %E% SMI"
31 #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 void arc_byteswap_func_t(void *buf, size_t size);
43 typedef int arc_evict_func_t(void *private);
45 /* generic arc_done_func_t's which you can use */
46 arc_done_func_t arc_bcopy_func;
47 arc_done_func_t arc_getbuf_func;
53 arc_evict_func_t *b_efunc;
57 typedef enum arc_buf_contents {
58 ARC_BUFC_UNDEF, /* buffer contents undefined */
59 ARC_BUFC_DATA, /* buffer contains data */
60 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 */
70 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
71 arc_buf_contents_t type);
72 void arc_buf_add_ref(arc_buf_t *buf, void *tag);
73 int arc_buf_remove_ref(arc_buf_t *buf, void *tag);
74 int arc_buf_size(arc_buf_t *buf);
75 void arc_release(arc_buf_t *buf, void *tag);
76 int arc_released(arc_buf_t *buf);
77 int arc_has_callback(arc_buf_t *buf);
78 void arc_buf_freeze(arc_buf_t *buf);
79 void arc_buf_thaw(arc_buf_t *buf);
81 int arc_referenced(arc_buf_t *buf);
84 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap,
85 arc_done_func_t *done, void *private, int priority, int flags,
86 uint32_t *arc_flags, zbookmark_t *zb);
87 zio_t *arc_write(zio_t *pio, spa_t *spa, int checksum, int compress,
88 int ncopies, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
89 arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority,
90 int flags, zbookmark_t *zb);
91 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
92 zio_done_func_t *done, void *private, uint32_t arc_flags);
93 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data);
95 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
96 int arc_buf_evict(arc_buf_t *buf);
99 void arc_tempreserve_clear(uint64_t tempreserve);
100 int arc_tempreserve_space(uint64_t tempreserve);
109 #endif /* _SYS_ARC_H */