sys/dmu_zfetch.h

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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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _DFETCH_H
#define _DFETCH_H

#include <sys/zfs_context.h>

#ifdef  __cplusplus
extern "C" {
#endif

extern uint64_t zfetch_array_rd_sz;

struct dnode;                           
typedef enum zfetch_dirn {
        ZFETCH_FORWARD = 1,             
        ZFETCH_BACKWARD = -1            
} zfetch_dirn_t;

typedef struct zstream {
        uint64_t        zst_offset;     
        uint64_t        zst_len;        
        zfetch_dirn_t   zst_direction;  
        uint64_t        zst_stride;     
        uint64_t        zst_ph_offset;  
        uint64_t        zst_cap;        
        kmutex_t        zst_lock;       
        clock_t         zst_last;       
        avl_node_t      zst_node;       
} zstream_t;

typedef struct zfetch {
        krwlock_t       zf_rwlock;      
        list_t          zf_stream;      
        struct dnode    *zf_dnode;      
        uint32_t        zf_stream_cnt;  
        uint64_t        zf_alloc_fail;  
} zfetch_t;

void            zfetch_init(void);
void            zfetch_fini(void);

void            dmu_zfetch_init(zfetch_t *, struct dnode *);
void            dmu_zfetch_rele(zfetch_t *);
void            dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int);


#ifdef  __cplusplus
}
#endif

#endif  /* _DFETCH_H */