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.\" Copyright (c) 1996 Doug Rabson
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.\" $FreeBSD: src/share/man/man9/VOP_FSYNC.9,v 1.17.2.2.2.1 2010/12/21 17:09:25 kensmith Exp $
.\"
.Dd July 24, 1996
.Dt VOP_FSYNC 9
.Os
.Sh NAME
.Nm VOP_FSYNC
.Nd flush file system buffers for a file
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn VOP_FSYNC "struct vnode *vp" "int waitfor" "struct thread *td"
.Sh DESCRIPTION
This call flushes any dirty file system 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 Fa vp
The vnode of the file.
.It Fa 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 file system syncer.
.El
.It Fa td
The calling thread.
.El
.Pp
The argument
.Fa waitfor
is either
.Dv MNT_WAIT
or
.Dv MNT_NOWAIT
and specifies whether or not the function should wait for the writes
to finish before returning.
.Sh LOCKS
The file should be locked on entry.
.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 file system is full.
.It Bq Er EDQUOT
Quota exceeded.
.El
.Sh SEE ALSO
.Xr vnode 9
.Sh AUTHORS
This manual page was written by
.An Doug Rabson .