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 , vdrop 34.Nd "acquire/release a hold on a vnode" 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 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, 49it will be removed. 50.Pp 51The 52.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 , 58the system will panic. 59If the vnode is no longer referenced, it will freed. 60.Sh SEE ALSO 61.Xr vbusy 9 , 62.Xr vfree 9 63.Sh AUTHORS 64This man page was written by 65.An Chad David Aq davidc@acns.ab.ca . 66