.\"     $OpenBSD: vinvalbuf.9,v 1.10 2016/03/19 12:04:15 natano Exp $
.\"
.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\" $FreeBSD: src/share/man/man9/vinvalbuf.9,v 1.6 2001/10/06 11:19:41 sheldonh Exp $
.\"
.Dd $Mdocdate: March 19 2016 $
.Dt VINVALBUF 9
.Os
.Sh NAME
.Nm vinvalbuf
.Nd flush and invalidate all buffers associated with a vnode
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn vinvalbuf "struct vnode *vp" "int flags" "struct ucred *cred" \
    "struct proc *p" "int slpflag" "int slptimeo"
.Sh DESCRIPTION
The
.Fn vinvalbuf
function invalidates all of the buffers associated with the given vnode.
This includes buffers on the clean list and the dirty list.
If the
.Dv V_SAVE
flag is specified then the buffers on the dirty list are synced prior to being
released.
If the
.Dv V_SAVEMETA
flag is set, indirect blocks will not be flushed.
.Pp
Its arguments are:
.Bl -tag -width ".Fa slptimeo"
.It Fa vp
A pointer to the vnode whose buffers will be invalidated.
.It Fa flags
The supported flags are
.Dv V_SAVE
and
.Dv V_SAVEMETA .
.Dv V_SAVE
indicates that dirty buffers should be synced with the disk.
.Dv V_SAVEMETA
indicates that indirect blocks should not be flushed.
.It Fa cred
The user credentials that are used to
.Xr VOP_FSYNC 9
buffers if
.Dv V_SAVE
is set.
.It Fa p
The process responsible for this call.
.It Fa slpflag
The slp flag that will be used in the priority of any sleeps in the function.
.It Fa slptimeo
The timeout for any sleeps in the function.
.El
.Sh LOCKS
The vnode is assumed to be locked prior to the call and remains locked upon
return.
.Sh RETURN VALUES
A value of 0 is returned on success.
.Sh PSEUDOCODE
.Bd -literal -offset indent
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0);
VOP_UNLOCK(devvp, p);
if (error)
	return (error);
.Ed
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENOSPC
The file system is full.
(With
.Dv V_SAVE )
.It Bq Er EDQUOT
Disc quota exceeded.
(With
.Dv V_SAVE )
.It Bq Er EWOULDBLOCK
Sleep operation timed out.
(See
.Fa slptimeo )
.It Bq Er ERESTART
A signal needs to be delivered and the system call should be restarted.
(With
.Dv PCATCH
set in
.Fa slpflag )
.It Bq Er EINTR
The system has been interrupted by a signal.
(With
.Dv PCATCH
set in
.Fa slpflag )
.El
.Sh SEE ALSO
.Xr tsleep 9 ,
.Xr vnode 9
.Sh AUTHORS
This man page was originally written by
.An Chad David Aq Mt davidc@acns.ab.ca
for
.Fx .