core: general cgroup rework

Replace the very generic cgroup hookup with a much simpler one. With
this change only the high-level cgroup settings remain, the ability to
set arbitrary cgroup attributes is removed, so is support for adding
units to arbitrary cgroup controllers or setting arbitrary paths for
them (especially paths that are different for the various controllers).

This also introduces a new -.slice root slice, that is the parent of
system.slice and friends. This enables easy admin configuration of
root-level cgrouo properties.

This replaces DeviceDeny= by DevicePolicy=, and implicitly adds in
/dev/null, /dev/zero and friends if DeviceAllow= is used (unless this is
turned off by DevicePolicy=).

1 files changed, 7 insertions, 3 deletions

diff --git a/src/core/manager.h b/src/core/manager.h
index f0bb2eb035..68cb2e4a3d 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -27,6 +27,7 @@
 #include <dbus/dbus.h>
 
 #include "fdset.h"
+#include "cgroup-util.h"
 
 /* Enforce upper limit how many names we allow */
 #define MANAGER_MAX_NAMES 131072 /* 128K */
@@ -86,6 +87,7 @@ struct Watch {
 #include "dbus.h"
 #include "path-lookup.h"
 #include "execute.h"
+#include "unit-name.h"
 
 struct Manager {
         /* Note that the set of units we know of is allowed to be
@@ -122,6 +124,9 @@ struct Manager {
         /* Units to check when doing GC */
         LIST_HEAD(Unit, gc_queue);
 
+        /* Units that should be realized */
+        LIST_HEAD(Unit, cgroup_queue);
+
         Hashmap *watch_pids;  /* pid => Unit object n:1 */
 
         char *notify_socket;
@@ -139,7 +144,6 @@ struct Manager {
         Set *unit_path_cache;
 
         char **environment;
-        char **default_controllers;
 
         usec_t runtime_watchdog;
         usec_t shutdown_watchdog;
@@ -198,7 +202,8 @@ struct Manager {
         int dev_autofs_fd;
 
         /* Data specific to the cgroup subsystem */
-        Hashmap *cgroup_bondings; /* path string => CGroupBonding object 1:n */
+        Hashmap *cgroup_unit;
+        CGroupControllerMask cgroup_supported;
         char *cgroup_root;
 
         usec_t gc_queue_timestamp;
@@ -273,7 +278,6 @@ unsigned manager_dispatch_run_queue(Manager *m);
 unsigned manager_dispatch_dbus_queue(Manager *m);
 
 int manager_set_default_environment(Manager *m, char **environment);
-int manager_set_default_controllers(Manager *m, char **controllers);
 int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit);
 
 int manager_loop(Manager *m);