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
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
(The comments found at the beginning of the groff file "man9/vfs_unmountall.9freebsd".)
- unmount all file systems
Fn vfs_unmountall void
run only at system shutdown,
unmounts all mounted file systems
from most recent to oldest
in order to avoid handling dependencies.