1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#ifndef _NBMLOCK_H
27#define	_NBMLOCK_H
28
29/*
30 * Non-blocking mandatory locking support.
31 */
32
33#ifdef __cplusplus
34extern "C" {
35#endif
36
37#include <sys/vnode.h>
38#include <sys/rwlock.h>
39#include <sys/cred.h>
40
41/*
42 * Type of operation; used when checking for lock/share conflict.
43 * NBL_READWRITE is used for checking for a conflict with an exclusive lock
44 * (F_WRLCK) or a read-write mmap request.  For checking an actual I/O
45 * request, use NBL_READ or NBL_WRITE.
46 */
47typedef enum {NBL_READ, NBL_WRITE, NBL_RENAME, NBL_REMOVE,
48	    NBL_READWRITE} nbl_op_t;
49
50/* critical region primitives */
51extern void nbl_start_crit(vnode_t *, krw_t);
52extern void nbl_end_crit(vnode_t *);
53extern int nbl_in_crit(vnode_t *);
54
55/* conflict checking */
56extern int nbl_need_check(vnode_t *);
57extern int nbl_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int,
58    caller_context_t *);
59extern int nbl_share_conflict(vnode_t *, nbl_op_t, caller_context_t *);
60extern int nbl_lock_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int,
61    caller_context_t *);
62extern int nbl_svmand(vnode_t *, cred_t *, int *);
63
64
65#ifdef __cplusplus
66}
67#endif
68
69#endif /* _NBMLOCK_H */
70