--- /dev/null
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+.Dd February 3, 2009
+.Os
+.Dt VCOUNT 9
+.Sh NAME
+.Nm vcount ,
+.Nm count_dev
+.Nd "get total number of references to a device"
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/vnode.h
+.Ft int
+.Fn vcount "struct vnode *vp"
+.Ft int
+.Fn count_dev "cdev_t dev"
+.Sh DESCRIPTION
+.Fn vcount
+is used to get the number of references to a special device.
+This makes sense because multiple vnodes may reference the same device.
+.Pp
+.Fn count_dev
+does the same thing as
+.Fn vcount ,
+but takes a
+.Vt cdev_t
+rather than a
+.Vt "struct vnode"
+pointer as an argument.
+It may only be called for
+.Dv VBLK
+and
+.Dv VCHR
+vnodes since
+.Fa v_rdev
+is an overloaded field.
+.Sh RETURN VALUES
+.Fn vcount
+and
+.Fn count_dev
+both return the number of references to the device.
+.Sh SEE ALSO
+.Xr vnode 9