1.\" -*- nroff -*-
2.\"
3.\" Copyright (c) 1996 Doug Rabson
4.\"
5.\" All rights reserved.
6.\"
7.\" This program is free software.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\"
18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28.\"
| 1.\" -*- nroff -*-
2.\"
3.\" Copyright (c) 1996 Doug Rabson
4.\"
5.\" All rights reserved.
6.\"
7.\" This program is free software.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\"
18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28.\"
|
30.\"
31.Dd July 24, 1996
32.Os
33.Dt VREF 9
34.Sh NAME
35.Nm vref
36.Nd increment the use count for a vnode
37.Sh SYNOPSIS
38.Fd #include <sys/param.h>
39.Fd #include <sys/vnode.h>
40.Ft void
41.Fn vref "struct vnode *vp"
42.Sh DESCRIPTION
43Increment the
44.Dv v_usecount
45field of a vnode.
46.Bl -tag -width vp
47.It Ar vp
48the vnode to increment
49.El
50.Pp
51Each vnode maintains a reference count of how many parts of the system
52are using the vnode. This allows the system to detect when a vnode is
53no longer being used and can be safely recycled for a different file.
54.Pp
55Any code in the system which is using a vnode (e.g. during the
56operation of some algorithm or to store in a data structure) should
57call
58.Xr vref 9 .
59.Sh SEE ALSO
60.Xr vget 9 ,
61.Xr vnode 9 ,
62.Xr vput 9 ,
63.Xr vrele 9
64.Sh AUTHORS
| 30.\"
31.Dd July 24, 1996
32.Os
33.Dt VREF 9
34.Sh NAME
35.Nm vref
36.Nd increment the use count for a vnode
37.Sh SYNOPSIS
38.Fd #include <sys/param.h>
39.Fd #include <sys/vnode.h>
40.Ft void
41.Fn vref "struct vnode *vp"
42.Sh DESCRIPTION
43Increment the
44.Dv v_usecount
45field of a vnode.
46.Bl -tag -width vp
47.It Ar vp
48the vnode to increment
49.El
50.Pp
51Each vnode maintains a reference count of how many parts of the system
52are using the vnode. This allows the system to detect when a vnode is
53no longer being used and can be safely recycled for a different file.
54.Pp
55Any code in the system which is using a vnode (e.g. during the
56operation of some algorithm or to store in a data structure) should
57call
58.Xr vref 9 .
59.Sh SEE ALSO
60.Xr vget 9 ,
61.Xr vnode 9 ,
62.Xr vput 9 ,
63.Xr vrele 9
64.Sh AUTHORS
|