unit: initialize bpf cgroup realization state properly

Before this patch, the bpf cgroup realization state was implicitly set
to "NO", meaning that the bpf configuration was realized but was turned
off. That means invalidation requests for the bpf stuff (which we issue
in blanket fashion when doing a daemon reload) would actually later
result in a us re-realizing the unit, under the assumption it was
already realized once, even though in reality it never was realized
before.

This had the effect that after each daemon-reload we'd end up realizing
*all* defined units, even the unloaded ones, populating cgroupfs with
lots of unneeded empty cgroups.

With this fix we properly set the realiazation state to "INVALIDATED",
i.e. indicating the bpf stuff was never set up for the unit, and hence
when we try to invalidate it later we won't do anything.

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 0db191590629ab997121f2cec2f357155301a1e6..a0371512da7b504bd83f54bd6bb813bc80a86ed9 100644 (file)
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -2495,7 +2495,7 @@ void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
         if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT))
                 m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT;
 
-        if ((u->cgroup_realized_mask & m) == 0)
+        if ((u->cgroup_realized_mask & m) == 0) /* NOP? */
                 return;
 
         u->cgroup_realized_mask &= ~m;
@@ -2508,7 +2508,7 @@ void unit_invalidate_cgroup_bpf(Unit *u) {
         if (!UNIT_HAS_CGROUP_CONTEXT(u))
                 return;
 
-        if (u->cgroup_bpf_state == UNIT_CGROUP_BPF_INVALIDATED)
+        if (u->cgroup_bpf_state == UNIT_CGROUP_BPF_INVALIDATED) /* NOP? */
                 return;
 
         u->cgroup_bpf_state = UNIT_CGROUP_BPF_INVALIDATED;