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.\" $FreeBSD: src/share/man/man9/VOP_FSYNC.9,v 1.6.2.2 2001/12/17 11:30:18 ru Exp $
.\"
.Dd October 8, 2014
.Dt VOP_FSYNC 9
.Os
.Sh NAME
.Nm VOP_FSYNC
.Nd flush filesystem buffers for a file
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn VOP_FSYNC "struct vnode *vp" "int waitfor" "int flags"
.Sh DESCRIPTION
This call flushes any dirty filesystem buffers for the file.
It is used to implement the
.Xr sync 2
and
.Xr fsync 2
system calls.
.Pp
Its arguments are:
.Bl -tag -width waitfor
.It Ar vp
the vnode of the file.
.It Ar waitfor
whether the function should do data, meta-data updates or be full-synchronous.
.It Ar flags
are additional flags to be passed to the filesystem specific
.Xr fsync 2
function.
.El
.Pp
The argument
.Fa waitfor
can use the following flags:
.Bl -tag -width ".Dv MNT_NOWAIT"
.It Dv MNT_NOWAIT
is for an asynchronous data pass and a meta-data pass as well.
.It Dv MNT_LAZY
means a limited amount of data from dirty buffers and a full meta-data synchronization pass.
.It Dv MNT_WAIT
will make
.Xr syncer 4
try to do a full synchronization pass.
That is, a meta-data pass and multiple data passes.
.El
.Pp
The argument
.Fa flags
is to specify additional flags passed to the filesystem specific
.Xr fsync 2
call.
The only supported flag at the moment is
.Dv VOP_FSYNC_SYSCALL
which indicates the file synchronization was requested from userland.
.Sh RETURN VALUES
Zero is returned if the call is successful, otherwise an appropriate
error code is returned.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENOSPC
The filesystem is full.
.It Bq Er EDQUOT
Quota exceeded.
.El
.Sh SEE ALSO
.Xr syncer 4 ,
.Xr vnode 9
.Sh AUTHORS
This man page was written by
.An Doug Rabson .