1/* $NetBSD: fstrans.h,v 1.10 2008/11/07 00:15:42 joerg Exp $ */
2
3/*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Juergen Hannken-Illjes.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * File system transaction operations.
34 */
35
36#ifndef _SYS_FSTRANS_H_
37#define _SYS_FSTRANS_H_
38
39#include <sys/mount.h>
40
41#define SUSPEND_SUSPEND 0x0001 /* VFS_SUSPENDCTL: suspend */
42#define SUSPEND_RESUME 0x0002 /* VFS_SUSPENDCTL: resume */
43
44enum fstrans_lock_type {
45 FSTRANS_LAZY = 1, /* Granted while not suspended */
46 FSTRANS_SHARED = 2 /* Granted while not suspending */
47#ifdef _FSTRANS_API_PRIVATE
48 ,
49 FSTRANS_EXCL = 3 /* Internal: exclusive lock */
50#endif /* _FSTRANS_API_PRIVATE */
51};
52
53enum fstrans_state {
54 FSTRANS_NORMAL,
55 FSTRANS_SUSPENDING,
56 FSTRANS_SUSPENDED
57};
58
59void fstrans_init(void);
60#define fstrans_start(mp, t) _fstrans_start((mp), (t), 1)
61#define fstrans_start_nowait(mp, t) _fstrans_start((mp), (t), 0)
62int _fstrans_start(struct mount *, enum fstrans_lock_type, int);
63void fstrans_done(struct mount *);
64int fstrans_is_owner(struct mount *);
65int fstrans_mount(struct mount *);
66void fstrans_unmount(struct mount *);
67
68int fstrans_setstate(struct mount *, enum fstrans_state);
69enum fstrans_state fstrans_getstate(struct mount *);
70
71int fscow_establish(struct mount *, int (*)(void *, struct buf *, bool),
72 void *);
73int fscow_disestablish(struct mount *, int (*)(void *, struct buf *, bool),
74 void *);
75int fscow_run(struct buf *, bool);
76
77int vfs_suspend(struct mount *, int);
78void vfs_resume(struct mount *);
79
80#endif /* _SYS_FSTRANS_H_ */
81