Add a short man page describing the vfs_unmountall() function.

MFC after:	1 week

2 files changed, 47 insertions, 1 deletions

diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index ce130be..05f65e6 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -57,7 +57,7 @@ MAN=	BUF_LOCK.9 BUF_LOCKFREE.9 BUF_LOCKINIT.9 BUF_REFCNT.9 \
 	style.9 suser.9 swi.9 sx.9 sysctl_add_oid.9 sysctl_ctx_init.9 \
 	taskqueue.9 time.9 timeout.9 tvtohz.9 \
 	ucred.9 uidinfo.9 uio.9 \
-	vcount.9 vfs_busy.9 vfs_mount.9 vfs_unbusy.9 vget.9 \
+	vcount.9 vfs_busy.9 vfs_mount.9 vfs_unbusy.9 vfs_unmountall.9 vget.9 \
 	vinvalbuf.9 \
 	vm_page_alloc.9 vm_page_copy.9 vm_page_flag.9 vm_page_hold.9 \
 	vm_page_insert.9 vm_page_io.9 vm_page_lookup.9 \
diff --git a/share/man/man9/vfs_unmountall.9 b/share/man/man9/vfs_unmountall.9
new file mode 100644
index 0000000..99768cf
--- /dev/null
+++ b/share/man/man9/vfs_unmountall.9
@@ -0,0 +1,46 @@
+.\" Copyright (c) 2001 Chris Costello <chris@FreeBSD.org>
+.\" 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.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\" 
+.\" 	$FreeBSD$
+.\" 
+.Dd July 26, 2001
+.Dt VFS_UNMOUNTALL 9
+.Os
+.Sh NAME
+.Nm vfs_unmountall
+.Nd unmount all file systems
+.Sh SYNOPSIS
+.Fd #include <sys/mount.h>
+.Ft void
+.Fn vfs_unmountall "void"
+.Sh DESCRIPTION
+The
+.Nm
+function,
+run only at system shutdown,
+unmounts all file mounted file systems
+from most recent to oldest
+in order to avoid handling dependencies.
+.Sh SEE ALSO
+.Xr boot 9