Tejun Heo
f08e928720
v232's cgroup hybrid mode mounted v2 on /sys/fs/cgroup/systemd, which unfortunately broke other tools which expect v1 there. From v233 on, hybrid mode instead mounts and uses v2 on /sys/fs/cgroup/unified and keeps /sys/fs/cgroup/systemd on v1 for compatibility with external tools. However, to keep systemd live upgrades working, v233+ should be able to recognize v232 layout and keep using it. This patch adds v232 hybrid mode support. If v232 layout is detected, cg_unified(SYSTEMD_CGRouP_CONTROLLER) keeps returning %true but cg_hybrid_unified() returns %false. This keeps process management on cgroup v2 but turns off the parallel layout.
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