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