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.\" $FreeBSD$ 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 . 63