xref: /netbsd/sys/sys/fstrans.h (revision 13da92d3)
1 /*	$NetBSD: fstrans.h,v 1.14 2020/05/13 09:21:30 hannken 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_state {
45 	FSTRANS_NORMAL,
46 	FSTRANS_SUSPENDED,
47 	FSTRANS_SUSPENDING
48 };
49 
50 void	fstrans_init(void);
51 void	fstrans_lwp_dtor(lwp_t *);
52 void	fstrans_start(struct mount *);
53 int	fstrans_start_nowait(struct mount *);
54 void	fstrans_start_lazy(struct mount *);
55 void	fstrans_done(struct mount *);
56 int	fstrans_held(struct mount *);
57 int	fstrans_is_owner(struct mount *);
58 int	fstrans_mount(struct mount *);
59 void	fstrans_unmount(struct mount *);
60 
61 int	fstrans_setstate(struct mount *, enum fstrans_state);
62 enum fstrans_state fstrans_getstate(struct mount *);
63 
64 int	fscow_establish(struct mount *, int (*)(void *, struct buf *, bool),
65 	    void *);
66 int	fscow_disestablish(struct mount *, int (*)(void *, struct buf *, bool),
67 	    void *);
68 int	fscow_run(struct buf *, bool);
69 
70 int	vfs_suspend(struct mount *, int);
71 void	vfs_resume(struct mount *);
72 
73 #endif /* _SYS_FSTRANS_H_ */
74