Michal Koutný
7b63961415
When we are about to derealize a controller on v1 cgroup, we first attempt to delete the controller cgroup and migrate afterwards. This doesn't work in practice because populated cgroup cannot be deleted. Furthermore, we leave out slices from migration completely, so (un)setting a control value on them won't realize their controller cgroup. Rework actual realization, unit_create_cgroup() becomes unit_update_cgroup() and make sure that controller hierarchies are reduced when given controller cgroup ceased to be needed. Note that with this we introduce slight deviation between v1 and v2 code -- when a descendant unit turns off a delegated controller, we attempt to disable it in ancestor slices. On v2 this may fail (kernel enforced, because of child cgroups using the controller), on v1 we'll migrate whole subtree and trim the subhierachy. (Previously, we wouldn't take away delegated controller, however, derealization was broken anyway.) Fixes: #14149
System and Service Manager
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