5dc6c3a38a
These functions take a `struct cdev *' -- not a dev_t. Inside the kernel, dev_t has the same use as in userspace, namely to store a device identifier. MFC after: 2 weeks
74 lines
2.3 KiB
Groff
74 lines
2.3 KiB
Groff
.\" -*- nroff -*-
|
|
.\"
|
|
.\" Copyright (c) 2000 Andrew Stevenson
|
|
.\"
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This program is free software.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" If this manual page travels to places exotic (like projects other than
|
|
.\" FreeBSD) I would love to hear about it.
|
|
.\" Andrew <andrew@ugh.net.au>
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 19, 2012
|
|
.Dt VCOUNT 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vcount ,
|
|
.Nm count_dev
|
|
.Nd "get total number of references to a device"
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In sys/time.h
|
|
.In sys/conf.h
|
|
.In sys/vnode.h
|
|
.Ft int
|
|
.Fn vcount "struct vnode *vp"
|
|
.Ft int
|
|
.Fn count_dev "struct cdev *dev"
|
|
.Sh DESCRIPTION
|
|
.Fn vcount
|
|
is used to get the number of references to a particular device.
|
|
It allows for the fact that multiple vnodes may reference the same device.
|
|
.Fn count_dev
|
|
does the same thing as
|
|
.Fn vcount ,
|
|
but takes a
|
|
.Vt "struct cdev"
|
|
rather than a
|
|
.Vt "struct vnode"
|
|
pointer as an argument.
|
|
.Sh RETURN VALUES
|
|
.Fn vcount
|
|
and
|
|
.Fn count_dev
|
|
both return the number of references to the device.
|
|
.Sh SEE ALSO
|
|
.Xr VFS 9 ,
|
|
.Xr vnode 9
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Andrew Stevenson .
|