core: rework cgroup mask propagation

Previously a cgroup setting down tree would result in cgroup membership
additions being propagated up the tree and to the siblings, however a
unit could never lose cgroup memberships again. With this change we'll
make sure that both cgroup additions and removals propagate properly.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 25f40f7b62..be717ad877 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -90,12 +90,19 @@ void cgroup_context_init(CGroupContext *c);
 void cgroup_context_done(CGroupContext *c);
 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix);
 void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path);
+
 CGroupControllerMask cgroup_context_get_mask(CGroupContext *c);
 
 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
 
+CGroupControllerMask unit_get_cgroup_mask(Unit *u);
+CGroupControllerMask unit_get_siblings_mask(Unit *u);
+CGroupControllerMask unit_get_members_mask(Unit *u);
+CGroupControllerMask unit_get_target_mask(Unit *u);
+
+void unit_update_cgroup_members_masks(Unit *u);
 int unit_realize_cgroup(Unit *u);
 void unit_destroy_cgroup(Unit *u);
 
@@ -113,5 +120,3 @@ int manager_notify_cgroup_empty(Manager *m, const char *group);
 
 const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
 CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
-
-void unit_update_member_masks(Unit *u);