vhold.9 (2164257702740979d6ffebaba02a3fd778aea2c3) vhold.9 (1f620c2ead117e9b4f698560053721d05a6637a3)
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

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25.\" DAMAGE.
26.\"
27.\" $FreeBSD$
28.\"
29.Dd November 21, 2001
30.Dt VHOLD 9
31.Os
32.Sh NAME
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

--- 16 unchanged lines hidden (view full) ---

25.\" DAMAGE.
26.\"
27.\" $FreeBSD$
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"
33.Nm vhold , vdrop
34.Nd "acquire/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
35.Sh SYNOPSIS
36.In sys/param.h
37.In sys/vnode.h
38.Ft void
39.Fn vhold "struct vnode *vp"
40.Ft void
41.Fn vdrop "struct vnode *vp"
42.Sh DESCRIPTION
43The
44.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
45function increments the
46.Va v_holdcnt
47of the given vnode.
48If the vnode has already been added to the free list and is still referenced,
48it will be removed.
49.Pp
50The
51.Fn vdrop
49it will be removed.
50.Pp
51The
52.Fn vdrop
52function decrements the v_holdcnt of the vnode.
53If the holdcount is zero or less prior to calling
54.Fn vdrop
53function decrements the
54.Va v_holdcnt
55of the vnode.
56If the holdcount is less than or equal zero prior to calling
57.Fn vdrop ,
55the system will panic.
58the system will panic.
56If the vnode is no longer referenced it will freed.
59If the vnode is no longer referenced, it will freed.
57.Sh SEE ALSO
60.Sh SEE ALSO
58.Xr vfree 9 ,
59.Xr vbusy 9
61.Xr vbusy 9 ,
62.Xr vfree 9
60.Sh AUTHORS
61This man page was written by
62.An Chad David Aq davidc@acns.ab.ca .
63.Sh AUTHORS
64This man page was written by
65.An Chad David Aq davidc@acns.ab.ca .