LXC: don't unmount mounts for shared root
Also after commit 5ff9d8a65ce80efb509ce4e8051394e9ed2cd942
vfs: Lock in place mounts from more privileged users,
unprivileged user has no rights to umount the mounts that
inherited from parent mountns.
right now, I have no good idea to fix this problem, we need
to do more research. this patch just skip unmounting these
mounts for shared root.
BTW, I think when libvirt lxc enables user namespace, the
configuation that shares root with host is very rara.
Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com>
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