tree 14b02283f72d5f1345af0cd8c0f305306f6925a6
parent 9b6e31021122babe3b3a67b102479f740928b5eb
author Al Viro <viro@zeniv.linux.org.uk> 1263664568 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1263664568 -0500

may_umount() needs namespace_sem

otherwise it races with clone_mnt() changing mnt_share/mnt_slaves

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>