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+.\"
+.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
+.\"
+.\" 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(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
+.\"
+.Dd June 28, 2021
+.Dt VN_ISDISK 9
+.Os
+.Sh NAME
+.Nm vn_isdisk
+.Nd "checks if a vnode represents a disk"
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/vnode.h
+.Ft bool
+.Fn vn_isdisk "struct vnode *vp"
+.Ft bool
+.Fn vn_isdisk_error "struct vnode *vp" "int *errp"
+.Sh DESCRIPTION
+The
+.Fn vn_isdisk
+and
+.Fn vn_isdisk_error
+functions check to see if
+.Fa vp
+represents a disk.
+In order for
+.Fa vp
+to be a disk,
+it must be a character device,
+.Va v_rdev
+must be valid, and the
+.Vt cdevsw
+entry's
+.Va flags
+must have
+.Dv D_DISK
+set.
+.Pp
+The arguments are:
+.Bl -tag -width ".Fa errp"
+.It Fa vp
+The vnode to check.
+.It Fa errp
+An integer pointer to store the error number in if the call fails.
+.El
+.Sh RETURN VALUES
+If the vnode represents a disk, true is returned; otherwise, false
+is returned and
+.Fa errp
+will contain the error number.
+.Sh AUTHORS
+This manual page was written by
+.An Chad David Aq Mt davidc@acns.ab.ca .