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: src/share/man/man9/vhold.9,v 1.4 2005/07/22 00:28:22 rodrigc Exp $ 28.\" $DragonFly: src/share/man/man9/vhold.9,v 1.1 2007/03/04 02:45:08 swildner Exp $ 29.\" 30.Dd March 4, 2007 31.Dt VHOLD 9 32.Os 33.Sh NAME 34.Nm vhold , vdrop 35.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 46function increments the 47.Va v_holdcnt 48of the given vnode. 49If the vnode has already been added to the free list and is still referenced, 50it will be removed. 51.Pp 52The 53.Fn vdrop 54function decrements the 55.Va v_holdcnt 56of the vnode. 57If the holdcount is less than or equal to zero prior to calling 58.Fn vdrop , 59the system will panic. 60If the vnode is no longer referenced, it will be freed. 61.Sh SEE ALSO 62.Xr vbusy 9 , 63.Xr vfree 9 64.Sh AUTHORS 65This manual page was written by 66.An Chad David Aq davidc@acns.ab.ca . 67