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.\" Copyright (c) 1996 Doug Rabson
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.\" $FreeBSD$
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.Dd July 24, 1996
.Os
.Dt VFS_SYNC 9
.Sh NAME
.Nm VFS_SYNC
.Nd flush unwritten data
.Sh SYNOPSIS
.In sys/param.h
.In sys/mount.h
.In sys/vnode.h
.Ft int
.Fn VFS_SYNC "struct mount *mp" "int waitfor" "struct ucred *cred" "struct thread *td"
.Sh DESCRIPTION
This writes out all unwritten data in a filesystem.
.Pp
Its arguments are:
.Bl -tag -width waitfor
.It Ar mp
The filesystem.
.It Ar waitfor
Whether the function should wait for I/O to complete.
Possible values are:
.Bl -tag -width MNT_NOWAIT
.It Dv MNT_WAIT
synchronously wait for I/O to complete
.It Dv MNT_NOWAIT
start all I/O, but do not wait for it
.It Dv MNT_LAZY
push data not written by filesystem syncer
.El
.It Ar cred
The caller's credentials.
.It Ar td
The calling thread.
.El
.Pp
This would normally call
.Xr VOP_FSYNC 9
for all the vnodes in the filesystem.
.Sh SEE ALSO
.Xr fsync 2 ,
.Xr sync 2 ,
.Xr VFS 9 ,
.Xr vnode 9 ,
.Xr VOP_FSYNC 9
.Sh AUTHORS
This man page was written by
.An Doug Rabson .