.\" 2008-10-06, mtk: Created this as a new page by splitting
.\" umount/umount2 material out of mount.2
.\"
-.TH UMOUNT 2 2009-09-03 "Linux" "Linux Programmer's Manual"
+.TH UMOUNT 2 2010-06-19 "Linux" "Linux Programmer's Manual"
.SH NAME
umount, umount2 \- unmount file system
.SH SYNOPSIS
.B MNT_FORCE
or
.BR MNT_DETACH .
+.TP
+.BR UMOUNT_NOFOLLOW " (since Linux 2.6.34)"
+Don't dereference
+.I target
+if it is a symbolic link.
+This flag allows security problems to be avoided in in set-user-ID-\fIroot\fP
+programs that allow unprivileged users to unmount file systems.
.SH "RETURN VALUE"
On success, zero is returned.
On error, \-1 is returned, and
.I errno
is set appropriately.
.SH ERRORS
-The error values given below result from filesystem type independent
+The error values given below result from file-system type independent
errors.
-Each filesystem type may have its own special errors and its
+Each file system type may have its own special errors and its
own special behavior.
See the kernel source code for details.
.TP