if (de->d_type != DT_DIR)
continue;
- if (dot_or_dot_dot(de->d_name))
+ if (streq(de->d_name, ".") ||
+ streq(de->d_name, ".."))
continue;
b = strdup(de->d_name);
if (r < 0 && errno != ENOENT)
return -errno;
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
- if (r < 0)
- log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path);
- }
-
return 0;
}
* just cuts off the name= prefixed used for named
* hierarchies, if it is specified. */
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
- if (cg_hybrid_unified())
- controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID;
- else
- controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
- }
-
e = startswith(controller, "name=");
if (e)
return e;
}
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
- int r;
+ int unified, r;
assert(fs);
if (!cg_controller_is_valid(controller))
return -EINVAL;
- if (cg_all_unified())
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+
+ if (unified > 0)
r = join_path_unified(path, suffix, fs);
else
r = join_path_legacy(controller, path, suffix, fs);
}
static int controller_is_accessible(const char *controller) {
+ int unified;
assert(controller);
if (!cg_controller_is_valid(controller))
return -EINVAL;
- if (cg_all_unified()) {
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
/* We don't support named hierarchies if we are using
* the unified hierarchy. */
int cg_trim(const char *controller, const char *path, bool delete_root) {
_cleanup_free_ char *fs = NULL;
- int r = 0, q;
+ int r = 0;
assert(path);
return -errno;
}
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root);
- if (q < 0)
- log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path);
- }
-
return r;
}
return -errno;
}
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
- if (r < 0)
- log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path);
- }
-
return 1;
}
xsprintf(c, PID_FMT "\n", pid);
- r = write_string_file(fs, c, 0);
- if (r < 0)
- return r;
-
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid);
- if (r < 0)
- log_warning_errno(r, "Failed to attach %d to compat systemd cgroup %s: %m", pid, path);
- }
-
- return 0;
+ return write_string_file(fs, c, 0);
}
int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
if (r < 0)
return r;
- r = chmod_and_chown(fs, mode, uid, gid);
- if (r < 0)
- return r;
-
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid);
- if (r < 0)
- log_warning_errno(r, "Failed to set group access on compat systemd cgroup %s: %m", path);
- }
-
- return 0;
+ return chmod_and_chown(fs, mode, uid, gid);
}
int cg_set_task_access(
gid_t gid) {
_cleanup_free_ char *fs = NULL, *procs = NULL;
- int r;
+ int r, unified;
assert(path);
if (r < 0)
return r;
- if (!cg_unified(controller)) {
- /* Compatibility, Always keep values for "tasks" in sync with
- * "cgroup.procs" */
- if (cg_get_path(controller, path, "tasks", &procs) >= 0)
- (void) chmod_and_chown(procs, mode, uid, gid);
- }
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified)
+ return 0;
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
- r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid);
- if (r < 0)
- log_warning_errno(r, "Failed to set task access on compat systemd cgroup %s: %m", path);
- }
+ /* Compatibility, Always keep values for "tasks" in sync with
+ * "cgroup.procs" */
+ if (cg_get_path(controller, path, "tasks", &procs) >= 0)
+ (void) chmod_and_chown(procs, mode, uid, gid);
return 0;
}
int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
_cleanup_fclose_ FILE *f = NULL;
char line[LINE_MAX];
- const char *fs, *controller_str;
+ const char *fs;
size_t cs = 0;
- bool unified;
+ int unified;
assert(path);
assert(pid >= 0);
controller = SYSTEMD_CGROUP_CONTROLLER;
unified = cg_unified(controller);
- if (!unified) {
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
- controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
- else
- controller_str = controller;
-
- cs = strlen(controller_str);
- }
+ if (unified < 0)
+ return unified;
+ if (unified == 0)
+ cs = strlen(controller);
fs = procfs_file_alloca(pid, "cgroup");
log_debug_elogind("Searching for PID %u in \"%s\" (controller \"%s\")",
*e = 0;
FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
- if (k == cs && memcmp(word, controller_str, cs) == 0) {
+ if (k == cs && memcmp(word, controller, cs) == 0) {
found = true;
break;
}
int cg_install_release_agent(const char *controller, const char *agent) {
_cleanup_free_ char *fs = NULL, *contents = NULL;
const char *sc;
- int r;
+ int r, unified;
assert(agent);
- if (cg_unified(controller)) /* doesn't apply to unified hierarchy */
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified) /* doesn't apply to unified hierarchy */
return -EOPNOTSUPP;
r = cg_get_path(controller, NULL, "release_agent", &fs);
int cg_uninstall_release_agent(const char *controller) {
_cleanup_free_ char *fs = NULL;
- int r;
+ int r, unified;
- if (cg_unified(controller)) /* Doesn't apply to unified hierarchy */
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified) /* Doesn't apply to unified hierarchy */
return -EOPNOTSUPP;
r = cg_get_path(controller, NULL, "notify_on_release", &fs);
}
int cg_is_empty_recursive(const char *controller, const char *path) {
- int r;
+ int unified, r;
assert(path);
if (controller && (isempty(path) || path_equal(path, "/")))
return false;
- if (cg_unified(controller)) {
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+
+ if (unified > 0) {
_cleanup_free_ char *t = NULL;
/* On the unified hierarchy we can check empty state
if (!p)
return false;
- if (streq(p, SYSTEMD_CGROUP_CONTROLLER))
- return true;
-
s = startswith(p, "name=");
if (s)
p = s;
int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
CGroupController c;
- int r;
+ int r, unified;
/* This one will create a cgroup in our private tree, but also
* duplicate it in the trees specified in mask, and remove it
return r;
/* If we are in the unified hierarchy, we are done now */
- if (cg_all_unified())
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
return 0;
/* Otherwise, do the same in the other hierarchies */
int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
CGroupController c;
- int r;
+ int r, unified;
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
if (r < 0)
return r;
- if (cg_all_unified())
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
return 0;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
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;
+ int r = 0, unified;
if (!path_equal(from, to)) {
r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE);
return r;
}
- if (cg_all_unified())
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
return r;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
CGroupController c;
- int r;
+ int r, unified;
r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
if (r < 0)
return r;
- if (cg_all_unified())
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
return r;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
int cg_mask_supported(CGroupMask *ret) {
CGroupMask mask = 0;
- int r;
+ int r, unified;
/* Determines the mask of supported cgroup controllers. Only
* includes controllers we can make sense of and that are
* actually accessible. */
- if (cg_all_unified()) {
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
_cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
const char *c;
static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN;
-/* The hybrid mode was initially implemented in v232 and simply mounted
- * cgroup v2 on /sys/fs/cgroup/systemd. This unfortunately broke other
- * tools (such as docker) which expected the v1 "name=systemd" hierarchy
- * on /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mountnbs
- * v2 on /sys/fs/cgroup/unified and maintains "name=systemd" hierarchy
- * on /sys/fs/cgroup/systemd for compatibility with other tools.
- *
- * To keep live upgrade working, we detect and support v232 layout. When
- * v232 layout is detected, to keep cgroup v2 process management but
- * disable the compat dual layout, we return %true on
- * cg_unified(SYSTEMD_CGROUP_CONTROLLER) and %false on cg_hybrid_unified().
- */
-static thread_local bool unified_systemd_v232;
-
static int cg_update_unified(void) {
struct statfs fs;
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
unified_cache = CGROUP_UNIFIED_ALL;
else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
- if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
- F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
- unified_cache = CGROUP_UNIFIED_SYSTEMD;
- unified_systemd_v232 = false;
- } else if (statfs("/sys/fs/cgroup/systemd/", &fs) == 0 &&
- F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
- unified_cache = CGROUP_UNIFIED_SYSTEMD;
- unified_systemd_v232 = true;
- } else {
- if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
- return -errno;
- if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
- return -ENOMEDIUM;
- unified_cache = CGROUP_UNIFIED_NONE;
- }
+ 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;
#else
return 0;
}
-bool cg_unified(const char *controller) {
+int cg_unified(const char *controller) {
+
+ int r;
- assert(cg_update_unified() >= 0);
+ r = cg_update_unified();
+ if (r < 0)
+ return r;
if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER))
return unified_cache >= CGROUP_UNIFIED_SYSTEMD;
return unified_cache >= CGROUP_UNIFIED_ALL;
}
-bool cg_all_unified(void) {
+int cg_all_unified(void) {
return cg_unified(NULL);
}
#if 0 /// UNNEEDED by elogind
-bool cg_hybrid_unified(void) {
-
- assert(cg_update_unified() >= 0);
-
- return unified_cache == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232;
-}
-
-int cg_unified_flush(void) {
+void 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;
+ int r, unified;
assert(p);
if (supported == 0)
return 0;
- if (!cg_all_unified()) /* on the legacy hiearchy there's no joining of controllers defined */
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (!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);
bool cg_is_unified_wanted(void) {
static thread_local int wanted = -1;
- int r;
+ int r, unified;
bool b;
/* If the hierarchy is already mounted, then follow whatever
* was chosen for it. */
- if (cg_unified_flush() >= 0)
- return cg_all_unified();
+ unified = cg_all_unified();
+ 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
bool cg_is_unified_systemd_controller_wanted(void) {
static thread_local int wanted = -1;
- int r;
+ int r, unified;
bool b;
/* If the unified hierarchy is requested in full, no need to
/* If the hierarchy is already mounted, then follow whatever
* was chosen for it. */
- if (cg_unified_flush() >= 0)
- return cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+ 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
~ianmdlvl / elogind.git / blobdiff