locks: Don't allow mounts in user namespaces to enable mandatory locking

Since no one uses mandatory locking and files with mandatory locks can
cause problems don't allow them in user namespaces.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
1 file changed