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 | |
44 | enum 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 | |
53 | enum fstrans_state { |
54 | FSTRANS_NORMAL, |
55 | FSTRANS_SUSPENDING, |
56 | FSTRANS_SUSPENDED |
57 | }; |
58 | |
59 | void 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) |
62 | int _fstrans_start(struct mount *, enum fstrans_lock_type, int); |
63 | void fstrans_done(struct mount *); |
64 | int fstrans_is_owner(struct mount *); |
65 | int fstrans_mount(struct mount *); |
66 | void fstrans_unmount(struct mount *); |
67 | |
68 | int fstrans_setstate(struct mount *, enum fstrans_state); |
69 | enum fstrans_state fstrans_getstate(struct mount *); |
70 | |
71 | int fscow_establish(struct mount *, int (*)(void *, struct buf *, bool), |
72 | void *); |
73 | int fscow_disestablish(struct mount *, int (*)(void *, struct buf *, bool), |
74 | void *); |
75 | int fscow_run(struct buf *, bool); |
76 | |
77 | int vfs_suspend(struct mount *, int); |
78 | void vfs_resume(struct mount *); |
79 | |
80 | #endif /* _SYS_FSTRANS_H_ */ |
81 | |