1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 1996 Doug Rabson 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd January 7, 2005 32.Os 33.Dt VFS_SYNC 9 34.Sh NAME 35.Nm VFS_SYNC 36.Nd flush unwritten data 37.Sh SYNOPSIS 38.In sys/param.h 39.In sys/mount.h 40.In sys/vnode.h 41.Ft int 42.Fn VFS_SYNC "struct mount *mp" "int waitfor" "struct ucred *cred" "struct thread *td" 43.Sh DESCRIPTION 44The 45.Fn VFS_SYNC 46macro writes out all unwritten data in the file system mounted as 47.Fa mp . 48.Pp 49The arguments it expects are: 50.Bl -tag -width ".Fa waitfor" 51.It Fa mp 52The file system. 53.It Fa waitfor 54Whether the function should wait for I/O to complete. 55Possible values are: 56.Bl -tag -width MNT_NOWAIT 57.It Dv MNT_WAIT 58synchronously wait for I/O to complete 59.It Dv MNT_NOWAIT 60start all I/O, but do not wait for it 61.It Dv MNT_LAZY 62push data not written by file system syncer 63.El 64.It Fa cred 65The caller's credentials. 66.It Fa td 67The calling thread. 68.El 69.Pp 70The 71.Fn VFS_SYNC 72macro calls the 73.Va vfs_sync 74method of the file system, which normally calls 75.Xr VOP_FSYNC 9 76for all the vnodes in the file system. 77.Sh SEE ALSO 78.Xr fsync 2 , 79.Xr sync 2 , 80.Xr VFS 9 , 81.Xr vnode 9 , 82.Xr VOP_FSYNC 9 83.Sh AUTHORS 84This manual page was written by 85.An Doug Rabson . 86