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-rw-r--r--src/basic/cgroup-util.c119
1 files changed, 37 insertions, 82 deletions
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 6948ed3931..48623fb235 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -594,7 +594,7 @@ static int join_path_unified(const char *path, const char *suffix, char **fs) {
}
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
- int unified, r;
+ int r;
assert(fs);
@@ -623,11 +623,7 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
if (!cg_controller_is_valid(controller))
return -EINVAL;
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
-
- if (unified > 0)
+ if (cg_all_unified())
r = join_path_unified(path, suffix, fs);
else
r = join_path_legacy(controller, path, suffix, fs);
@@ -639,7 +635,6 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
}
static int controller_is_accessible(const char *controller) {
- int unified;
assert(controller);
@@ -651,10 +646,7 @@ static int controller_is_accessible(const char *controller) {
if (!cg_controller_is_valid(controller))
return -EINVAL;
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0) {
+ if (cg_all_unified()) {
/* We don't support named hierarchies if we are using
* the unified hierarchy. */
@@ -851,7 +843,7 @@ int cg_set_task_access(
gid_t gid) {
_cleanup_free_ char *fs = NULL, *procs = NULL;
- int r, unified;
+ int r;
assert(path);
@@ -869,10 +861,7 @@ int cg_set_task_access(
if (r < 0)
return r;
- unified = cg_unified(controller);
- if (unified < 0)
- return unified;
- if (unified)
+ if (cg_unified(controller))
return 0;
/* Compatibility, Always keep values for "tasks" in sync with
@@ -925,7 +914,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
char line[LINE_MAX];
const char *fs;
size_t cs = 0;
- int unified;
+ bool unified;
assert(path);
assert(pid >= 0);
@@ -937,9 +926,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
controller = SYSTEMD_CGROUP_CONTROLLER;
unified = cg_unified(controller);
- if (unified < 0)
- return unified;
- if (unified == 0)
+ if (!unified)
cs = strlen(controller);
fs = procfs_file_alloca(pid, "cgroup");
@@ -1001,14 +988,11 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
int cg_install_release_agent(const char *controller, const char *agent) {
_cleanup_free_ char *fs = NULL, *contents = NULL;
const char *sc;
- int r, unified;
+ int r;
assert(agent);
- unified = cg_unified(controller);
- if (unified < 0)
- return unified;
- if (unified) /* doesn't apply to unified hierarchy */
+ if (cg_unified(controller)) /* doesn't apply to unified hierarchy */
return -EOPNOTSUPP;
r = cg_get_path(controller, NULL, "release_agent", &fs);
@@ -1054,12 +1038,9 @@ int cg_install_release_agent(const char *controller, const char *agent) {
int cg_uninstall_release_agent(const char *controller) {
_cleanup_free_ char *fs = NULL;
- int r, unified;
+ int r;
- unified = cg_unified(controller);
- if (unified < 0)
- return unified;
- if (unified) /* Doesn't apply to unified hierarchy */
+ if (cg_unified(controller)) /* Doesn't apply to unified hierarchy */
return -EOPNOTSUPP;
r = cg_get_path(controller, NULL, "notify_on_release", &fs);
@@ -1104,7 +1085,7 @@ int cg_is_empty(const char *controller, const char *path) {
}
int cg_is_empty_recursive(const char *controller, const char *path) {
- int unified, r;
+ int r;
assert(path);
@@ -1112,11 +1093,7 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
if (controller && (isempty(path) || path_equal(path, "/")))
return false;
- unified = cg_unified(controller);
- if (unified < 0)
- return unified;
-
- if (unified > 0) {
+ if (cg_unified(controller)) {
_cleanup_free_ char *t = NULL;
/* On the unified hierarchy we can check empty state
@@ -1986,7 +1963,7 @@ int cg_get_keyed_attribute(const char *controller, const char *path, const char
int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
CGroupController c;
- int r, unified;
+ int r;
/* This one will create a cgroup in our private tree, but also
* duplicate it in the trees specified in mask, and remove it
@@ -1998,10 +1975,7 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
return r;
/* If we are in the unified hierarchy, we are done now */
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0)
+ if (cg_all_unified())
return 0;
/* Otherwise, do the same in the other hierarchies */
@@ -2022,16 +1996,13 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
CGroupController c;
- int r, unified;
+ int r;
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
if (r < 0)
return r;
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0)
+ if (cg_all_unified())
return 0;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2072,7 +2043,7 @@ int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids,
int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
CGroupController c;
- int r = 0, unified;
+ int r = 0;
if (!path_equal(from, to)) {
r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE);
@@ -2080,10 +2051,7 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
return r;
}
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0)
+ if (cg_all_unified())
return r;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2107,16 +2075,13 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
CGroupController c;
- int r, unified;
+ int r;
r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
if (r < 0)
return r;
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0)
+ if (cg_all_unified())
return r;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2133,16 +2098,13 @@ int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root)
int cg_mask_supported(CGroupMask *ret) {
CGroupMask mask = 0;
- int r, unified;
+ int r;
/* Determines the mask of supported cgroup controllers. Only
* includes controllers we can make sense of and that are
* actually accessible. */
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (unified > 0) {
+ if (cg_all_unified()) {
_cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
const char *c;
@@ -2291,13 +2253,9 @@ static int cg_update_unified(void) {
return 0;
}
-int cg_unified(const char *controller) {
-
- int r;
+bool cg_unified(const char *controller) {
- r = cg_update_unified();
- if (r < 0)
- return r;
+ assert(cg_update_unified() >= 0);
if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER))
return unified_cache >= CGROUP_UNIFIED_SYSTEMD;
@@ -2305,29 +2263,28 @@ int cg_unified(const char *controller) {
return unified_cache >= CGROUP_UNIFIED_ALL;
}
-int cg_all_unified(void) {
+bool cg_all_unified(void) {
return cg_unified(NULL);
}
-void cg_unified_flush(void) {
+int cg_unified_flush(void) {
unified_cache = CGROUP_UNIFIED_UNKNOWN;
+
+ return cg_update_unified();
}
int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
_cleanup_free_ char *fs = NULL;
CGroupController c;
- int r, unified;
+ int r;
assert(p);
if (supported == 0)
return 0;
- unified = cg_all_unified();
- if (unified < 0)
- return unified;
- if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */
+ if (!cg_all_unified()) /* on the legacy hiearchy there's no joining of controllers defined */
return 0;
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
@@ -2359,14 +2316,13 @@ int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
bool cg_is_unified_wanted(void) {
static thread_local int wanted = -1;
- int r, unified;
+ int r;
bool b;
/* If the hierarchy is already mounted, then follow whatever
* was chosen for it. */
- unified = cg_all_unified();
- if (unified >= 0)
- return unified;
+ if (cg_unified_flush() >= 0)
+ return cg_all_unified();
/* Otherwise, let's see what the kernel command line has to
* say. Since checking that is expensive, let's cache the
@@ -2387,7 +2343,7 @@ bool cg_is_legacy_wanted(void) {
bool cg_is_unified_systemd_controller_wanted(void) {
static thread_local int wanted = -1;
- int r, unified;
+ int r;
bool b;
/* If the unified hierarchy is requested in full, no need to
@@ -2397,9 +2353,8 @@ bool cg_is_unified_systemd_controller_wanted(void) {
/* If the hierarchy is already mounted, then follow whatever
* was chosen for it. */
- unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
- if (unified >= 0)
- return unified;
+ if (cg_unified_flush() >= 0)
+ return cg_unified(SYSTEMD_CGROUP_CONTROLLER);
/* Otherwise, let's see what the kernel command line has to
* say. Since checking that is expensive, let's cache the
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-03 08:25:04 +0000