may_umount() needs namespace_sem
otherwise it races with clone_mnt() changing mnt_share/mnt_slaves
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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otherwise it races with clone_mnt() changing mnt_share/mnt_slaves
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>