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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_ARC_H
#define _SYS_ARC_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/zfs_context.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/zio.h>
typedef struct arc_buf_hdr arc_buf_hdr_t;
typedef struct arc_buf arc_buf_t;
typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
typedef void arc_byteswap_func_t(void *buf, size_t size);
typedef int arc_evict_func_t(void *private);
/* generic arc_done_func_t's which you can use */
arc_done_func_t arc_bcopy_func;
arc_done_func_t arc_getbuf_func;
struct arc_buf {
arc_buf_hdr_t *b_hdr;
arc_buf_t *b_next;
void *b_data;
arc_evict_func_t *b_efunc;
void *b_private;
};
typedef enum arc_buf_contents {
ARC_BUFC_UNDEF, /* buffer contents undefined */
ARC_BUFC_DATA, /* buffer contains data */
ARC_BUFC_METADATA /* buffer contains metadata */
} arc_buf_contents_t;
/*
* These are the flags we pass into calls to the arc
*/
#define ARC_WAIT (1 << 1) /* perform I/O synchronously */
#define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */
#define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */
#define ARC_CACHED (1 << 4) /* I/O was already in cache */
arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
arc_buf_contents_t type);
void arc_buf_add_ref(arc_buf_t *buf, void *tag);
int arc_buf_remove_ref(arc_buf_t *buf, void *tag);
int arc_buf_size(arc_buf_t *buf);
void arc_release(arc_buf_t *buf, void *tag);
int arc_released(arc_buf_t *buf);
int arc_has_callback(arc_buf_t *buf);
void arc_buf_freeze(arc_buf_t *buf);
void arc_buf_thaw(arc_buf_t *buf);
#ifdef ZFS_DEBUG
int arc_referenced(arc_buf_t *buf);
#endif
int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap,
arc_done_func_t *done, void *private, int priority, int flags,
uint32_t *arc_flags, zbookmark_t *zb);
zio_t *arc_write(zio_t *pio, spa_t *spa, int checksum, int compress,
int ncopies, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority,
int flags, zbookmark_t *zb);
int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
zio_done_func_t *done, void *private, uint32_t arc_flags);
int arc_tryread(spa_t *spa, blkptr_t *bp, void *data);
void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
int arc_buf_evict(arc_buf_t *buf);
void arc_flush(void);
void arc_tempreserve_clear(uint64_t tempreserve);
int arc_tempreserve_space(uint64_t tempreserve);
void arc_init(void);
void arc_fini(void);
#ifdef __cplusplus
}
#endif
#endif /* _SYS_ARC_H */
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