sys/zfs_rlock.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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_FS_ZFS_RLOCK_H
#define _SYS_FS_ZFS_RLOCK_H

#pragma ident   "%Z%%M% %I%     %E% SMI"

#ifdef  __cplusplus
extern "C" {
#endif

#ifdef _KERNEL

#include <sys/zfs_znode.h>

typedef enum {
        RL_READER,
        RL_WRITER,
        RL_APPEND
} rl_type_t;

typedef struct rl {
        znode_t *r_zp;          
        avl_node_t r_node;      
        uint64_t r_off;         
        uint64_t r_len;         
        uint_t r_cnt;           
        rl_type_t r_type;       
        kcondvar_t r_wr_cv;     
        kcondvar_t r_rd_cv;     
        uint8_t r_proxy;        
        uint8_t r_write_wanted; 
        uint8_t r_read_wanted;  
} rl_t;

rl_t *zfs_range_lock(znode_t *zp, uint64_t off, uint64_t len, rl_type_t type);

void zfs_range_unlock(rl_t *rl);

void zfs_range_reduce(rl_t *rl, uint64_t off, uint64_t len);

int zfs_range_compare(const void *arg1, const void *arg2);

#endif /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_FS_ZFS_RLOCK_H */