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If a parent mount point is shared with exteranl mntns, a child will be umounted from the external mntns too. For example: $ mount -t tmpfs xxx /root/tmp/ $ mount --make-shared tmp $ mkdir tmp/xxx $ mount -t tmpfs xxx /root/tmp/xxx $ touch tmp/xxx/a $ unshare -m umount tmp/xxx $ ls -l tmp/xxx/a ls: cannot access tmp/xxx/a: No such file or directory This patch changes a parent mnt to private for umounting childrens. v2: exit if a mount point can not be marked ad private Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
criu ==== An utility to checkpoint/restore tasks. Some code snippets are borrowed from - Linux kernel (http://kernel.org/) - git (http://git-scm.com/) - kvm-tools (https://github.com/penberg/linux-kvm) - ptrace-parasite (https://code.google.com/p/ptrace-parasite/) Many thanks to these projects. Licensed under GPLv2 (http://www.gnu.org/licenses/gpl-2.0.txt)