if (!cg_controller_is_valid(controller))
return -EINVAL;
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (!cg_controller_is_valid(controller))
return -EINVAL;
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0) {
if (r < 0)
return r;
- unified = cg_unified();
+ unified = cg_unified(controller);
if (unified < 0)
return unified;
if (unified)
assert(path);
assert(pid >= 0);
- unified = cg_unified();
+ if (controller) {
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+ } else
+ controller = SYSTEMD_CGROUP_CONTROLLER;
+
+ unified = cg_unified(controller);
if (unified < 0)
return unified;
- if (unified == 0) {
- if (controller) {
- if (!cg_controller_is_valid(controller))
- return -EINVAL;
- } else
- controller = SYSTEMD_CGROUP_CONTROLLER;
-
+ if (unified == 0)
cs = strlen(controller);
- }
fs = procfs_file_alloca(pid, "cgroup");
f = fopen(fs, "re");
assert(agent);
- unified = cg_unified();
+ unified = cg_unified(controller);
if (unified < 0)
return unified;
if (unified) /* doesn't apply to unified hierarchy */
_cleanup_free_ char *fs = NULL;
int r, unified;
- unified = cg_unified();
+ unified = cg_unified(controller);
if (unified < 0)
return unified;
if (unified) /* Doesn't apply to unified hierarchy */
if (controller && (isempty(path) || path_equal(path, "/")))
return false;
- unified = cg_unified();
+ unified = cg_unified(controller);
if (unified < 0)
return unified;
return r;
/* If we are in the unified hierarchy, we are done now */
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0)
if (r < 0)
return r;
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0)
return r;
}
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0)
if (r < 0)
return r;
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0)
* includes controllers we can make sense of and that are
* actually accessible. */
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (unified > 0) {
return 0;
}
-static thread_local int unified_cache = -1;
+static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN;
+
+static int cg_update_unified(void) {
-int cg_unified(void) {
struct statfs fs;
/* Checks if we support the unified hierarchy. Returns an
* have any other trouble determining if the unified hierarchy
* is supported. */
- if (unified_cache >= 0)
- return unified_cache;
+ if (unified_cache >= CGROUP_UNIFIED_NONE)
+ return 0;
if (statfs("/sys/fs/cgroup/", &fs) < 0)
return -errno;
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
- unified_cache = true;
- else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC))
- unified_cache = false;
- else
+ unified_cache = CGROUP_UNIFIED_ALL;
+ else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
+ if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
+ return -errno;
+
+ unified_cache = F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC) ?
+ CGROUP_UNIFIED_SYSTEMD : CGROUP_UNIFIED_NONE;
+ } else
return -ENOMEDIUM;
- return unified_cache;
+ return 0;
+}
+
+int cg_unified(const char *controller) {
+
+ int r;
+
+ r = cg_update_unified();
+ if (r < 0)
+ return r;
+
+ if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER))
+ return unified_cache >= CGROUP_UNIFIED_SYSTEMD;
+ else
+ return unified_cache >= CGROUP_UNIFIED_ALL;
+}
+
+int cg_all_unified(void) {
+
+ return cg_unified(NULL);
}
void cg_unified_flush(void) {
- unified_cache = -1;
+ unified_cache = CGROUP_UNIFIED_UNKNOWN;
}
int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
if (supported == 0)
return 0;
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified < 0)
return unified;
if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */
/* If the hierarchy is already mounted, then follow whatever
* was chosen for it. */
- unified = cg_unified();
+ unified = cg_all_unified();
if (unified >= 0)
return unified;
return !cg_is_unified_wanted();
}
+bool cg_is_unified_systemd_controller_wanted(void) {
+ static thread_local int wanted = -1;
+ int r, unified;
+
+ /* If the unified hierarchy is requested in full, no need to
+ * bother with this. */
+ if (cg_is_unified_wanted())
+ return 0;
+
+ /* If the hierarchy is already mounted, then follow whatever
+ * was chosen for it. */
+ unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+ if (unified >= 0)
+ return unified;
+
+ /* Otherwise, let's see what the kernel command line has to
+ * say. Since checking that is expensive, let's cache the
+ * result. */
+ if (wanted >= 0)
+ return wanted;
+
+ r = get_proc_cmdline_key("systemd.legacy_systemd_cgroup_controller", NULL);
+ if (r > 0)
+ wanted = false;
+ else {
+ _cleanup_free_ char *value = NULL;
+
+ r = get_proc_cmdline_key("systemd.legacy_systemd_cgroup_controller=", &value);
+ if (r < 0)
+ return true;
+
+ if (r == 0)
+ wanted = true;
+ else
+ wanted = parse_boolean(value) <= 0;
+ }
+
+ return wanted;
+}
+
+bool cg_is_legacy_systemd_controller_wanted(void) {
+ return cg_is_legacy_wanted() && !cg_is_unified_systemd_controller_wanted();
+}
+
int cg_weight_parse(const char *s, uint64_t *ret) {
uint64_t u;
int r;