fab63cc413
incomplete and some are just placeholders but I wanted to try to get something at least into 2.2 on the grounds that what I have is a lot better than nothing. I also wanted to commit something which documents the interfaces in 2.2 before I start updating the documentation for 3.0. This is a definite 2.2 candidate and is also relavent to 2.1 if people still care about that branch.
69 lines
2.4 KiB
Groff
69 lines
2.4 KiB
Groff
.\" -*- nroff -*-
|
|
.\"
|
|
.\" Copyright (c) 1996 Doug Rabson
|
|
.\"
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This program is free software.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $Id$
|
|
.\"
|
|
.Dd July 24, 1996
|
|
.Os
|
|
.Dt vget 9
|
|
.Sh NAME
|
|
.Nm vget
|
|
.Nd get a vnode from the free list
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/vnode.h>
|
|
.Ft int
|
|
.Fn vget "struct vnode *vp" "int lockflag"
|
|
.Sh DESCRIPTION
|
|
Get a vnode from the free list and increment its reference count.
|
|
.Bl -tag -width lockflag
|
|
.It Ar vp
|
|
the vnode to remove from the free list
|
|
.It Ar lockflag
|
|
if non-zero, the vnode will also be locked
|
|
.El
|
|
.Pp
|
|
When not in use, vnodes are kept on a free list. The vnodes still
|
|
reference valid files but may be reused to refer to a new file at any
|
|
time. Often, these vnodes are also held in caches in the system, such
|
|
as the name cache.
|
|
.Pp
|
|
When a vnode which is on the free list is used again, for instance if
|
|
the vnode was found in the name cache as a result of a call to
|
|
.Xr VOP_LOOKUP 9
|
|
then the new user must call
|
|
.Xr vget 9
|
|
to increment the reference count and remove it from the free list.
|
|
.Sh SEE ALSO
|
|
.Xr vnode 9 ,
|
|
.Xr vput 9 ,
|
|
.Xr vref 9 ,
|
|
.Xr vrele 9
|
|
.Sh AUTHORS
|
|
This man page was written by Doug Rabson.
|
|
|