Add a vcount(9) manual page.

Submitted-by:  Stathis Kamperis <ekamperi@gmail.com>
Dragonfly-bug: <http://bugs.dragonflybsd.org/issue1266>

diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index f903f9e..3b258ff 100644 (file)
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -134,6 +134,7 @@ MAN=        accept_filter.9 \
        tvtohz.9 \
        uio.9 \
        usbdi.9 \
+       vcount.9 \
        vflush.9 \
        VFS.9 \
        VFS_CHECKEXP.9 \
@@ -656,6 +657,7 @@ MLINKS+=usbdi.9 usbd_abort_default_pipe.9 \
        usbdi.9 usbd_sync_transfer.9 \
        usbdi.9 usbd_transfer.9 \
        usbdi.9 usb_find_desc.9
+MLINKS+=vcount.9 count_dev.9
 MLINKS+=vhold.9 vdrop.9
 MLINKS+=VOP_ATTRIB.9 VOP_GETATTR.9 \
        VOP_ATTRIB.9 VOP_SETATTR.9

diff --git a/share/man/man9/vcount.9 b/share/man/man9/vcount.9
new file mode 100644 (file)
index 0000000..b8033d7
--- /dev/null
+++ b/share/man/man9/vcount.9
@@ -0,0 +1,72 @@
+.\"
+.\" Copyright (c) 2009
+.\"    The DragonFly Project.  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, 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.
+.\" 3. Neither the name of The DragonFly Project nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific, prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+.\" ``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 HOLDERS OR CONTRIBUTORS 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 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