| 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 | |