1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2000 Andrew Stevenson 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" If this manual page travels to places exotic (like projects other than 30.\" FreeBSD) I would love to hear about it. 31.\" Andrew <andrew@ugh.net.au> 32.\" 33.\" $FreeBSD$ 34.\" 35.Dd January 19, 2012 36.Dt VCOUNT 9 37.Os 38.Sh NAME 39.Nm vcount , 40.Nm count_dev 41.Nd "get total number of references to a device" 42.Sh SYNOPSIS 43.In sys/param.h 44.In sys/time.h 45.In sys/conf.h 46.In sys/vnode.h 47.Ft int 48.Fn vcount "struct vnode *vp" 49.Ft int 50.Fn count_dev "struct cdev *dev" 51.Sh DESCRIPTION 52.Fn vcount 53is used to get the number of references to a particular device. 54It allows for the fact that multiple vnodes may reference the same device. 55.Fn count_dev 56does the same thing as 57.Fn vcount , 58but takes a 59.Vt "struct cdev" 60rather than a 61.Vt "struct vnode" 62pointer as an argument. 63.Sh RETURN VALUES 64.Fn vcount 65and 66.Fn count_dev 67both return the number of references to the device. 68.Sh SEE ALSO 69.Xr VFS 9 , 70.Xr vnode 9 71.Sh AUTHORS 72This manual page was written by 73.An Andrew Stevenson . 74