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Kir Kolyshkin
c85cd2b325
In cgroup v1, the parent of a cgroup mount is on tmpfs (or maybe any other fs but definitely not cgroupfs). Use this to traverse up the tree until we reach non-cgroupfs. This should work in any setups (nested container, non-standard cgroup mounts) so issue [1] won't happen. Theoretically, the only problematic case is when someone mounts cpuset cgroupfs into a directory on another cgroupfs. Let's assume people don't do that -- if they do, they will get other error (e.g. inability to read cpuset.cpus file). [1] https://github.com/opencontainers/runc/issues/1367 Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>