nbmlock.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 (c) 2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#ifndef _NBMLOCK_H
#define _NBMLOCK_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Non-blocking mandatory locking support.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/vnode.h>
#include <sys/rwlock.h>
#include <sys/cred.h>
/*
* Type of operation; used when checking for lock/share conflict.
* NBL_READWRITE is used for checking for a conflict with an exclusive lock
* (F_WRLCK) or a read-write mmap request. For checking an actual I/O
* request, use NBL_READ or NBL_WRITE.
*/
typedef enum {NBL_READ, NBL_WRITE, NBL_RENAME, NBL_REMOVE,
NBL_READWRITE} nbl_op_t;
/* critical region primitives */
extern void nbl_start_crit(vnode_t *, krw_t);
extern void nbl_end_crit(vnode_t *);
extern int nbl_in_crit(vnode_t *);
/* conflict checking */
extern int nbl_need_check(vnode_t *);
extern int nbl_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int);
extern int nbl_share_conflict(vnode_t *, nbl_op_t);
extern int nbl_lock_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int);
extern int nbl_svmand(vnode_t *, cred_t *, int *);
extern nbl_op_t nbl_lock_to_op(int);
#ifdef __cplusplus
}
#endif
#endif /* _NBMLOCK_H */