1.\"
2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice(s), this list of conditions and the following disclaimer as
9.\" the first lines of this file unmodified other than the possible
10.\" addition of one or more copyright notices.
11.\" 2. Redistributions in binary form must reproduce the above copyright
12.\" notice(s), this list of conditions and the following disclaimer in the
13.\" documentation and/or other materials provided with the distribution.
14.\"
15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
16.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
25.\" DAMAGE.
26.\"
27.\" $FreeBSD: head/share/man/man9/vhold.9 87182 2001-12-02 02:13:35Z alfred $
28.\"
29.Dd November 21, 2001
30.Dt VHOLD 9
31.Os
32.Sh NAME
33.Nm vhold
34.Nm vdrop
35.Nd "aquire/release a hold on a vnode"
36.Sh SYNOPSIS
37.In sys/param.h
38.In sys/vnode.h
39.Ft void
40.Fn vhold "struct vnode *vp"
41.Ft void
42.Fn vdrop "struct vnode *vp"
43.Sh DESCRIPTION
44The
45.Fn vhold
46function increments the v_holdcnt of the given vnode.
47If the vnode has already been added to the free list and is still referenced
48it will be removed.
49.Pp
50The
51.Fn vdrop
52function decrements the v_holdcnt of the vnode.
53If the holdcount is zero or less prior to calling
54.Fn vdrop
55the system will panic.
56If the vnode is no longer referenced it will freed.
57.Sh SEE ALSO
58.Xr vfree 9 ,
59.Xr vbusy 9
60.Sh AUTHORS
61This man page was written by
62.An Chad David Aq davidc@acns.ab.ca .
2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice(s), this list of conditions and the following disclaimer as
9.\" the first lines of this file unmodified other than the possible
10.\" addition of one or more copyright notices.
11.\" 2. Redistributions in binary form must reproduce the above copyright
12.\" notice(s), this list of conditions and the following disclaimer in the
13.\" documentation and/or other materials provided with the distribution.
14.\"
15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
16.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
25.\" DAMAGE.
26.\"
27.\" $FreeBSD: head/share/man/man9/vhold.9 87182 2001-12-02 02:13:35Z alfred $
28.\"
29.Dd November 21, 2001
30.Dt VHOLD 9
31.Os
32.Sh NAME
33.Nm vhold
34.Nm vdrop
35.Nd "aquire/release a hold on a vnode"
36.Sh SYNOPSIS
37.In sys/param.h
38.In sys/vnode.h
39.Ft void
40.Fn vhold "struct vnode *vp"
41.Ft void
42.Fn vdrop "struct vnode *vp"
43.Sh DESCRIPTION
44The
45.Fn vhold
46function increments the v_holdcnt of the given vnode.
47If the vnode has already been added to the free list and is still referenced
48it will be removed.
49.Pp
50The
51.Fn vdrop
52function decrements the v_holdcnt of the vnode.
53If the holdcount is zero or less prior to calling
54.Fn vdrop
55the system will panic.
56If the vnode is no longer referenced it will freed.
57.Sh SEE ALSO
58.Xr vfree 9 ,
59.Xr vbusy 9
60.Sh AUTHORS
61This man page was written by
62.An Chad David Aq davidc@acns.ab.ca .