return r;
}
-static const char *normalize_controller(const char *controller) {
+static const char *controller_to_dirname(const char *controller) {
+ const char *e;
assert(controller);
- if (startswith(controller, "name="))
- return controller + 5;
- else
- return controller;
+ /* Converts a controller name to the directory name below
+ * /sys/fs/cgroup/ we want to mount it to. Effectively, this
+ * just cuts off the name= prefixed used for named
+ * hierarchies, if it is specified. */
+
+ e = startswith(controller, "name=");
+ if (e)
+ return e;
+
+ return controller;
}
-static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
+static int join_path_legacy(const char *controller_dn, const char *path, const char *suffix, char **fs) {
char *t = NULL;
- if (!isempty(controller)) {
- if (!isempty(path) && !isempty(suffix))
- t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
- else if (!isempty(path))
- t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
- else if (!isempty(suffix))
- t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
- else
- t = strappend("/sys/fs/cgroup/", controller);
- } else {
- if (!isempty(path) && !isempty(suffix))
- t = strjoin(path, "/", suffix, NULL);
- else if (!isempty(path))
- t = strdup(path);
- else
- return -EINVAL;
- }
+ assert(fs);
+ assert(controller_dn);
+
+ if (isempty(path) && isempty(suffix))
+ t = strappend("/sys/fs/cgroup/", controller_dn);
+ else if (isempty(path))
+ t = strjoin("/sys/fs/cgroup/", controller_dn, "/", suffix, NULL);
+ else if (isempty(suffix))
+ t = strjoin("/sys/fs/cgroup/", controller_dn, "/", path, NULL);
+ else
+ t = strjoin("/sys/fs/cgroup/", controller_dn, "/", path, "/", suffix, NULL);
+ if (!t)
+ return -ENOMEM;
+ *fs = t;
+ return 0;
+}
+
+static int join_path_unified(const char *path, const char *suffix, char **fs) {
+ char *t;
+
+ assert(fs);
+
+ if (isempty(path) && isempty(suffix))
+ t = strdup("/sys/fs/cgroup");
+ else if (isempty(path))
+ t = strappend("/sys/fs/cgroup/", suffix);
+ else if (isempty(suffix))
+ t = strappend("/sys/fs/cgroup/", path);
+ else
+ t = strjoin("/sys/fs/cgroup/", path, "/", suffix, NULL);
if (!t)
return -ENOMEM;
- *fs = path_kill_slashes(t);
+ *fs = t;
return 0;
}
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
- const char *p;
- static thread_local bool good = false;
+ int unified, r;
assert(fs);
- if (controller && !cg_controller_is_valid(controller))
+ if (!controller) {
+ char *t;
+
+ /* If no controller is specified, we assume only the
+ * path below the controller matters */
+
+ if (!path && !suffix)
+ return -EINVAL;
+
+ if (isempty(suffix))
+ t = strdup(path);
+ else if (isempty(path))
+ t = strdup(suffix);
+ else
+ t = strjoin(path, "/", suffix, NULL);
+ if (!t)
+ return -ENOMEM;
+
+ *fs = path_kill_slashes(t);
+ return 0;
+ }
+
+ if (!cg_controller_is_valid(controller))
return -EINVAL;
- if (_unlikely_(!good)) {
- int r;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
- r = path_is_mount_point("/sys/fs/cgroup", 0);
- if (r < 0)
- return r;
- if (r == 0)
- return -ENOENT;
+ if (unified > 0)
+ r = join_path_unified(path, suffix, fs);
+ else {
+ const char *dn;
- /* Cache this to save a few stat()s */
- good = true;
+ if (controller)
+ dn = controller_to_dirname(controller);
+ else
+ dn = NULL;
+
+ r = join_path_legacy(dn, path, suffix, fs);
}
- p = controller ? normalize_controller(controller) : NULL;
+ if (r < 0)
+ return r;
- return join_path(p, path, suffix, fs);
+ path_kill_slashes(*fs);
+ return 0;
}
-static int check_hierarchy(const char *p) {
- const char *cc;
+static int controller_is_accessible(const char *controller) {
+ int unified;
- assert(p);
+ assert(controller);
- if (!filename_is_valid(p))
- return 0;
+ /* Checks whether a specific controller is accessible,
+ * i.e. its hierarchy mounted. In the unified hierarchy all
+ * controllers are considered accessible, except for the named
+ * hierarchies */
- /* Check if this controller actually really exists */
- cc = strjoina("/sys/fs/cgroup/", p);
- if (laccess(cc, F_OK) < 0)
- return -errno;
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
+ /* We don't support named hierarchies if we are using
+ * the unified hierarchy. */
+
+ if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
+ return 0;
+
+ if (startswith(controller, "name="))
+ return -EOPNOTSUPP;
+
+ } else {
+ const char *cc, *dn;
+
+ dn = controller_to_dirname(controller);
+ cc = strjoina("/sys/fs/cgroup/", dn);
+
+ if (laccess(cc, F_OK) < 0)
+ return -errno;
+ }
return 0;
}
int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
- const char *p;
int r;
+ assert(controller);
assert(fs);
- if (!cg_controller_is_valid(controller))
- return -EINVAL;
-
- /* Normalize the controller syntax */
- p = normalize_controller(controller);
-
- /* Check if this controller actually really exists */
- r = check_hierarchy(p);
+ /* Check if the specified controller is actually accessible */
+ r = controller_is_accessible(controller);
if (r < 0)
return r;
- return join_path(p, path, suffix, fs);
+ return cg_get_path(controller, path, suffix, fs);
}
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
return r;
}
-int cg_delete(const char *controller, const char *path) {
- _cleanup_free_ char *parent = NULL;
- int r;
-
- assert(path);
-
- r = path_get_parent(path, &parent);
- if (r < 0)
- return r;
-
- r = cg_migrate_recursive(controller, path, controller, parent, false, true);
- return r == -ENOENT ? 0 : r;
-}
-
int cg_create(const char *controller, const char *path) {
_cleanup_free_ char *fs = NULL;
int r;
gid_t gid) {
_cleanup_free_ char *fs = NULL, *procs = NULL;
- int r;
+ int r, unified;
assert(path);
if (r < 0)
return r;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified)
+ return 0;
+
/* Compatibility, Always keep values for "tasks" in sync with
* "cgroup.procs" */
- r = cg_get_path(controller, path, "tasks", &procs);
- if (r < 0)
- return r;
+ if (cg_get_path(controller, path, "tasks", &procs) >= 0)
+ (void) chmod_and_chown(procs, mode, uid, gid);
- return 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;
- size_t cs;
+ size_t cs = 0;
+ int unified;
assert(path);
assert(pid >= 0);
- if (controller) {
- if (!cg_controller_is_valid(controller))
- return -EINVAL;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified == 0) {
+ if (controller) {
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+ } else
+ controller = SYSTEMD_CGROUP_CONTROLLER;
- controller = normalize_controller(controller);
- } else
- controller = SYSTEMD_CGROUP_CONTROLLER;
+ cs = strlen(controller);
+ }
fs = procfs_file_alloca(pid, "cgroup");
-
f = fopen(fs, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
- cs = strlen(controller);
-
FOREACH_LINE(line, f, return -errno) {
- char *l, *p, *e;
- size_t k;
- const char *word, *state;
- bool found = false;
+ char *e, *p;
truncate_nl(line);
- l = strchr(line, ':');
- if (!l)
- continue;
-
- l++;
- e = strchr(l, ':');
- if (!e)
- continue;
+ if (unified) {
+ e = startswith(line, "0:");
+ if (!e)
+ continue;
- *e = 0;
+ e = strchr(e, ':');
+ if (!e)
+ continue;
+ } else {
+ char *l;
+ size_t k;
+ const char *word, *state;
+ bool found = false;
+
+ l = strchr(line, ':');
+ if (!l)
+ continue;
- FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
+ l++;
+ e = strchr(l, ':');
+ if (!e)
+ continue;
- if (k == cs && memcmp(word, controller, cs) == 0) {
- found = true;
- break;
+ *e = 0;
+ FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
+ if (k == cs && memcmp(word, controller, cs) == 0) {
+ found = true;
+ break;
+ }
}
- if (k == 5 + cs &&
- memcmp(word, "name=", 5) == 0 &&
- memcmp(word+5, controller, cs) == 0) {
- found = true;
- break;
- }
+ if (!found)
+ continue;
}
- if (!found)
- continue;
-
p = strdup(e + 1);
if (!p)
return -ENOMEM;
int cg_install_release_agent(const char *controller, const char *agent) {
_cleanup_free_ char *fs = NULL, *contents = NULL;
- char *sc;
- int r;
+ const char *sc;
+ int r, unified;
assert(agent);
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified) /* doesn't apply to unified hierarchy */
+ return -EOPNOTSUPP;
+
r = cg_get_path(controller, NULL, "release_agent", &fs);
if (r < 0)
return r;
int cg_uninstall_release_agent(const char *controller) {
_cleanup_free_ char *fs = NULL;
- int r;
+ int r, unified;
+
+ unified = cg_unified();
+ 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);
if (r < 0)
int cg_is_empty(const char *controller, const char *path) {
_cleanup_fclose_ FILE *f = NULL;
- pid_t pid = 0;
+ pid_t pid;
int r;
assert(path);
}
int cg_is_empty_recursive(const char *controller, const char *path) {
- _cleanup_closedir_ DIR *d = NULL;
- char *fn;
- int r;
+ int unified, r;
assert(path);
/* The root cgroup is always populated */
if (controller && (isempty(path) || path_equal(path, "/")))
- return 0;
+ return false;
- r = cg_is_empty(controller, path);
- if (r <= 0)
- return r;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
- r = cg_enumerate_subgroups(controller, path, &d);
- if (r == -ENOENT)
- return 1;
- if (r < 0)
- return r;
+ if (unified > 0) {
+ _cleanup_free_ char *populated = NULL, *t = NULL;
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- _cleanup_free_ char *p = NULL;
+ /* On the unified hierarchy we can check empty state
+ * via the "cgroup.populated" attribute. */
- p = strjoin(path, "/", fn, NULL);
- free(fn);
- if (!p)
- return -ENOMEM;
+ r = cg_get_path(controller, path, "cgroup.populated", &populated);
+ if (r < 0)
+ return r;
+
+ r = read_one_line_file(populated, &t);
+ if (r < 0)
+ return r;
+
+ return streq(t, "0");
+ } else {
+ _cleanup_closedir_ DIR *d = NULL;
+ char *fn;
- r = cg_is_empty_recursive(controller, p);
+ r = cg_is_empty(controller, path);
if (r <= 0)
return r;
- }
- if (r < 0)
- return r;
+ r = cg_enumerate_subgroups(controller, path, &d);
+ if (r == -ENOENT)
+ return 1;
+ if (r < 0)
+ return r;
- return 1;
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(path, "/", fn, NULL);
+ free(fn);
+ if (!p)
+ return -ENOMEM;
+
+ r = cg_is_empty_recursive(controller, p);
+ if (r <= 0)
+ return r;
+ }
+ if (r < 0)
+ return r;
+
+ return true;
+ }
}
int cg_split_spec(const char *spec, char **controller, char **path) {
- const char *e;
char *t = NULL, *u = NULL;
- _cleanup_free_ char *v = NULL;
+ const char *e;
assert(spec);
return -EINVAL;
if (controller) {
- t = strdup(normalize_controller(spec));
+ t = strdup(spec);
if (!t)
return -ENOMEM;
return 0;
}
- v = strndup(spec, e-spec);
- if (!v)
- return -ENOMEM;
- t = strdup(normalize_controller(v));
+ t = strndup(spec, e-spec);
if (!t)
return -ENOMEM;
if (!cg_controller_is_valid(t)) {
return -EINVAL;
}
- if (streq(e+1, "")) {
- u = strdup("/");
- if (!u) {
- free(t);
- return -ENOMEM;
- }
- } else {
+ if (isempty(e+1))
+ u = NULL;
+ else {
u = strdup(e+1);
if (!u) {
free(t);
if (r < 0)
return r;
- return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
+ return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result);
}
int cg_get_root_path(char **path) {
if (r < 0)
return r;
- e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
+ e = endswith(p, "/" SPECIAL_INIT_SCOPE);
+ if (!e)
+ e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */
+ if (!e)
+ e = endswith(p, "/system"); /* even more legacy */
if (e)
*e = 0;
}
p = path_startswith(cgroup, root);
- if (p)
+ if (p && p > cgroup)
*shifted = p - 1;
else
*shifted = cgroup;
}
int cg_path_get_machine_name(const char *path, char **machine) {
- _cleanup_free_ char *u = NULL, *sl = NULL;
+ _cleanup_free_ char *u = NULL;
+ const char *sl;
int r;
r = cg_path_get_unit(path, &u);
if (r < 0)
return r;
- sl = strjoin("/run/systemd/machines/unit:", u, NULL);
- if (!sl)
- return -ENOMEM;
-
+ sl = strjoina("/run/systemd/machines/unit:", u);
return readlink_malloc(sl, machine);
}
p[0] == '.' ||
streq(p, "notify_on_release") ||
streq(p, "release_agent") ||
- streq(p, "tasks"))
+ streq(p, "tasks") ||
+ startswith(p, "cgroup."))
need_prefix = true;
else {
const char *dot;
dot = strrchr(p, '.');
if (dot) {
+ CGroupController c;
+ size_t l = dot - p;
- if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
- need_prefix = true;
- else {
- char *n;
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
- n = strndupa(p, dot - p);
+ if (l != strlen(n))
+ continue;
- if (check_hierarchy(n) >= 0)
- need_prefix = true;
+ if (memcmp(p, n, l) != 0)
+ continue;
+
+ need_prefix = true;
+ break;
}
}
}
if (need_prefix)
return strappend("_", p);
- else
- return strdup(p);
+
+ return strdup(p);
}
char *cg_unescape(const char *p) {
return read_one_line_file(p, ret);
}
-static const char mask_names[] =
- "cpu\0"
- "cpuacct\0"
- "blkio\0"
- "memory\0"
- "devices\0";
-
-int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
+int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
+ CGroupController c;
+ 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
if (r < 0)
return r;
- /* Then, do the same in the other hierarchies */
- NULSTR_FOREACH(n, mask_names) {
+ /* If we are in the unified hierarchy, we are done now */
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return 0;
+
+ /* Otherwise, do the same in the other hierarchies */
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
+
if (mask & bit)
- cg_create(n, path);
+ (void) cg_create(n, path);
else if (supported & bit)
- cg_trim(n, path, true);
-
- bit <<= 1;
+ (void) cg_trim(n, path, true);
}
return 0;
}
-int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
+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;
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
if (r < 0)
return r;
- NULSTR_FOREACH(n, mask_names) {
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return 0;
- if (supported & bit) {
- const char *p = NULL;
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *p = NULL;
- if (path_callback)
- p = path_callback(bit, userdata);
+ if (!(supported & bit))
+ continue;
- if (!p)
- p = path;
+ if (path_callback)
+ p = path_callback(bit, userdata);
- cg_attach_fallback(n, p, pid);
- }
+ if (!p)
+ p = path;
- bit <<= 1;
+ (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid);
}
return 0;
}
-int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
+int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
Iterator i;
void *pidp;
int r = 0;
int q;
q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
- if (q < 0)
+ if (q < 0 && r >= 0)
r = q;
}
return r;
}
-int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
+int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
+ CGroupController c;
+ int r, unified;
if (!path_equal(from, to)) {
r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
return r;
}
- NULSTR_FOREACH(n, mask_names) {
- if (supported & bit) {
- const char *p = NULL;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return r;
- if (to_callback)
- p = to_callback(bit, userdata);
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *p = NULL;
- if (!p)
- p = to;
+ if (!(supported & bit))
+ continue;
- cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
- }
+ if (to_callback)
+ p = to_callback(bit, userdata);
- bit <<= 1;
+ if (!p)
+ p = to;
+
+ (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, false, false);
}
return 0;
}
-int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
+int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
+ CGroupController c;
+ int r, unified;
r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
if (r < 0)
return r;
- NULSTR_FOREACH(n, mask_names) {
- if (supported & bit)
- cg_trim(n, path, delete_root);
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return r;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+
+ if (!(supported & bit))
+ continue;
- bit <<= 1;
+ (void) cg_trim(cgroup_controller_to_string(c), path, delete_root);
}
return 0;
}
-CGroupControllerMask cg_mask_supported(void) {
- CGroupControllerMask bit = 1, mask = 0;
- const char *n;
+int cg_mask_supported(CGroupMask *ret) {
+ CGroupMask mask = 0;
+ int r, unified;
+
+ /* Determines the mask of supported cgroup controllers. Only
+ * includes controllers we can make sense of and that are
+ * actually accessible. */
- NULSTR_FOREACH(n, mask_names) {
- if (check_hierarchy(n) >= 0)
- mask |= bit;
+ unified = cg_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
+ _cleanup_free_ char *controllers = NULL;
+ const char *c;
+
+ /* In the unified hierarchy we can read the supported
+ * and accessible controllers from a the top-level
+ * cgroup attribute */
+
+ r = read_one_line_file("/sys/fs/cgroup/cgroup.controllers", &controllers);
+ if (r < 0)
+ return r;
- bit <<= 1;
+ c = controllers;
+ for (;;) {
+ _cleanup_free_ char *n = NULL;
+ CGroupController v;
+
+ r = extract_first_word(&c, &n, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ v = cgroup_controller_from_string(n);
+ if (v < 0)
+ continue;
+
+ mask |= CGROUP_CONTROLLER_TO_MASK(v);
+ }
+
+ /* Currently, we only support the memory controller in
+ * the unified hierarchy, mask everything else off. */
+ mask &= CGROUP_MASK_MEMORY;
+
+ } else {
+ CGroupController c;
+
+ /* In the legacy hierarchy, we check whether which
+ * hierarchies are mounted. */
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
+ if (controller_is_accessible(n) >= 0)
+ mask |= CGROUP_CONTROLLER_TO_MASK(c);
+ }
}
- return mask;
+ *ret = mask;
+ return 0;
}
int cg_kernel_controllers(Set *controllers) {
continue;
}
- if (!filename_is_valid(controller)) {
+ if (!cg_controller_is_valid(controller)) {
free(controller);
return -EBADMSG;
}
return 0;
}
+
+static thread_local int unified_cache = -1;
+
+int cg_unified(void) {
+ struct statfs fs;
+
+ /* Checks if we support the unified hierarchy. Returns an
+ * error when the cgroup hierarchies aren't mounted yet or we
+ * have any other trouble determining if the unified hierarchy
+ * is supported. */
+
+ if (unified_cache >= 0)
+ return unified_cache;
+
+ if (statfs("/sys/fs/cgroup/", &fs) < 0)
+ return -errno;
+
+ if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
+ unified_cache = true;
+ else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC))
+ unified_cache = false;
+ else
+ return -ENOEXEC;
+
+ return unified_cache;
+}
+
+void cg_unified_flush(void) {
+ unified_cache = -1;
+}
+
+int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
+ _cleanup_free_ char *fs = NULL;
+ CGroupController c;
+ int r, unified;
+
+ assert(p);
+
+ if (supported == 0)
+ return 0;
+
+ unified = cg_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);
+ if (r < 0)
+ return r;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *n;
+
+ if (!(supported & bit))
+ continue;
+
+ n = cgroup_controller_to_string(c);
+ {
+ char s[1 + strlen(n) + 1];
+
+ s[0] = mask & bit ? '+' : '-';
+ strcpy(s + 1, n);
+
+ r = write_string_file(fs, s, 0);
+ if (r < 0)
+ log_warning_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs);
+ }
+ }
+
+ return 0;
+}
+
+bool cg_is_unified_wanted(void) {
+ static thread_local int wanted = -1;
+ int r, unified;
+
+ /* If the hierarchy is already mounted, then follow whatever
+ * was chosen for it. */
+ unified = cg_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
+ * result. */
+ if (wanted >= 0)
+ return wanted;
+
+ r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy", NULL);
+ if (r > 0)
+ return (wanted = true);
+ else {
+ _cleanup_free_ char *value = NULL;
+
+ r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy=", &value);
+ if (r < 0)
+ return false;
+ if (r == 0)
+ return (wanted = false);
+
+ return (wanted = parse_boolean(value) > 0);
+ }
+}
+
+bool cg_is_legacy_wanted(void) {
+ return !cg_is_unified_wanted();
+}
+
+static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
+ [CGROUP_CONTROLLER_CPU] = "cpu",
+ [CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
+ [CGROUP_CONTROLLER_BLKIO] = "blkio",
+ [CGROUP_CONTROLLER_MEMORY] = "memory",
+ [CGROUP_CONTROLLER_DEVICE] = "device",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
#include "set.h"
#include "def.h"
+/* An enum of well known cgroup controllers */
+typedef enum CGroupController {
+ CGROUP_CONTROLLER_CPU,
+ CGROUP_CONTROLLER_CPUACCT,
+ CGROUP_CONTROLLER_BLKIO,
+ CGROUP_CONTROLLER_MEMORY,
+ CGROUP_CONTROLLER_DEVICE,
+ _CGROUP_CONTROLLER_MAX,
+ _CGROUP_CONTROLLER_INVALID = -1,
+} CGroupController;
+
+#define CGROUP_CONTROLLER_TO_MASK(c) (1 << (c))
+
/* A bit mask of well known cgroup controllers */
-typedef enum CGroupControllerMask {
- CGROUP_CPU = 1,
- CGROUP_CPUACCT = 2,
- CGROUP_BLKIO = 4,
- CGROUP_MEMORY = 8,
- CGROUP_DEVICE = 16,
- _CGROUP_CONTROLLER_MASK_ALL = 31
-} CGroupControllerMask;
+typedef enum CGroupMask {
+ CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU),
+ CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT),
+ CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO),
+ CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
+ CGROUP_MASK_DEVICE = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICE),
+ _CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
+} CGroupMask;
/*
* General rules:
int cg_trim(const char *controller, const char *path, bool delete_root);
int cg_rmdir(const char *controller, const char *path);
-int cg_delete(const char *controller, const char *path);
int cg_create(const char *controller, const char *path);
int cg_attach(const char *controller, const char *path, pid_t pid);
int cg_slice_to_path(const char *unit, char **ret);
-typedef const char* (*cg_migrate_callback_t)(CGroupControllerMask mask, void *userdata);
+typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata);
-int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path);
-int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t callback, void *userdata);
-int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata);
-int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
-int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root);
+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 callback, void *userdata);
+int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata);
+int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
+int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root);
+int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p);
-CGroupControllerMask cg_mask_supported(void);
+int cg_mask_supported(CGroupMask *ret);
int cg_kernel_controllers(Set *controllers);
+
+int cg_unified(void);
+void cg_unified_flush(void);
+
+bool cg_is_unified_wanted(void);
+bool cg_is_legacy_wanted(void);
+
+const char* cgroup_controller_to_string(CGroupController c) _const_;
+CGroupController cgroup_controller_from_string(const char *s) _pure_;
* the watchdog pings will keep the loop busy. */
#define DEFAULT_EXIT_USEC (30*USEC_PER_SEC)
-#define SYSTEMD_CGROUP_CONTROLLER "systemd"
+#define SYSTEMD_CGROUP_CONTROLLER "name=systemd"
#define SIGNALS_CRASH_HANDLER SIGSEGV,SIGILL,SIGFPE,SIGBUS,SIGQUIT,SIGABRT
#define SIGNALS_IGNORE SIGPIPE
#define BTRFS_SUPER_MAGIC 0x9123683E
#endif
+#ifndef CGROUP_SUPER_MAGIC
+#define CGROUP_SUPER_MAGIC 0x27e0eb
+#endif
+
+#ifndef TMPFS_MAGIC
+#define TMPFS_MAGIC 0x01021994
+#endif
+
#ifndef MS_MOVE
#define MS_MOVE 8192
#endif
#define SPECIAL_USER_SLICE "user.slice"
#define SPECIAL_MACHINE_SLICE "machine.slice"
#define SPECIAL_ROOT_SLICE "-.slice"
+
+/* The scope unit systemd itself lives in. */
+#define SPECIAL_INIT_SCOPE "init.scope"
} else
path = root;
- printf("Controller %s; control group %s:\n", controller, path);
+ if (cg_unified() > 0)
+ printf("Control group %s:\n", path);
+ else
+ printf("Controller %s; control group %s:\n", controller, path);
fflush(stdout);
q = show_cgroup(controller, path, NULL, 0, arg_kernel_threads, output_flags);
if (g->n_tasks > 0)
g->n_tasks_valid = true;
- } else if (streq(controller, "cpuacct")) {
+ } else if (streq(controller, "cpuacct") && cg_unified() <= 0) {
_cleanup_free_ char *p = NULL, *v = NULL;
uint64_t new_usage;
nsec_t timestamp;
} else if (streq(controller, "memory")) {
_cleanup_free_ char *p = NULL, *v = NULL;
- r = cg_get_path(controller, path, "memory.usage_in_bytes", &p);
+ if (cg_unified() <= 0)
+ r = cg_get_path(controller, path, "memory.usage_in_bytes", &p);
+ else
+ r = cg_get_path(controller, path, "memory.current", &p);
if (r < 0)
return r;
if (g->memory > 0)
g->memory_valid = true;
- } else if (streq(controller, "blkio")) {
+ } else if (streq(controller, "blkio") && cg_unified() <= 0) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *p = NULL;
uint64_t wr = 0, rd = 0;
return -errno;
}
-void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state) {
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state) {
bool is_root;
int r;
* cgroup trees (assuming we are running in a container then),
* and missing cgroups, i.e. EROFS and ENOENT. */
- if ((mask & CGROUP_CPU) && !is_root) {
+ if ((mask & CGROUP_MASK_CPU) && !is_root) {
char buf[MAX(DECIMAL_STR_MAX(unsigned long), DECIMAL_STR_MAX(usec_t)) + 1];
sprintf(buf, "%lu\n",
"Failed to set cpu.cfs_quota_us on %s: %m", path);
}
- if (mask & CGROUP_BLKIO) {
+ if (mask & CGROUP_MASK_BLKIO) {
char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1,
DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1,
DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)];
}
}
- if ((mask & CGROUP_MEMORY) && !is_root) {
+ if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
if (c->memory_limit != (uint64_t) -1) {
char buf[DECIMAL_STR_MAX(uint64_t) + 1];
sprintf(buf, "%" PRIu64 "\n", c->memory_limit);
- r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
- } else
- r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1");
+
+ if (cg_unified() <= 0)
+ r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
+ else
+ r = cg_set_attribute("memory", path, "memory.max", buf);
+
+ } else {
+ if (cg_unified() <= 0)
+ r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1");
+ else
+ r = cg_set_attribute("memory", path, "memory.max", "max");
+ }
if (r < 0)
log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
- "Failed to set memory.limit_in_bytes on %s: %m", path);
+ "Failed to set memory.limit_in_bytes/memory.max on %s: %m", path);
}
- if ((mask & CGROUP_DEVICE) && !is_root) {
+ if ((mask & CGROUP_MASK_DEVICE) && !is_root) {
CGroupDeviceAllow *a;
/* Changing the devices list of a populated cgroup
}
}
-CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) {
- CGroupControllerMask mask = 0;
+CGroupMask cgroup_context_get_mask(CGroupContext *c) {
+ CGroupMask mask = 0;
/* Figure out which controllers we need */
c->cpu_shares != (unsigned long) -1 ||
c->startup_cpu_shares != (unsigned long) -1 ||
c->cpu_quota_per_sec_usec != USEC_INFINITY)
- mask |= CGROUP_CPUACCT | CGROUP_CPU;
+ mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
if (c->blockio_accounting ||
c->blockio_weight != (unsigned long) -1 ||
c->startup_blockio_weight != (unsigned long) -1 ||
c->blockio_device_weights ||
c->blockio_device_bandwidths)
- mask |= CGROUP_BLKIO;
+ mask |= CGROUP_MASK_BLKIO;
if (c->memory_accounting ||
c->memory_limit != (uint64_t) -1)
- mask |= CGROUP_MEMORY;
+ mask |= CGROUP_MASK_MEMORY;
if (c->device_allow ||
c->device_policy != CGROUP_AUTO)
- mask |= CGROUP_DEVICE;
+ mask |= CGROUP_MASK_DEVICE;
return mask;
}
-CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
+CGroupMask unit_get_own_mask(Unit *u) {
CGroupContext *c;
+ /* Returns the mask of controllers the unit needs for itself */
+
c = unit_get_cgroup_context(u);
if (!c)
return 0;
e = unit_get_exec_context(u);
if (!e || exec_context_maintains_privileges(e))
- return _CGROUP_CONTROLLER_MASK_ALL;
+ return _CGROUP_MASK_ALL;
}
return cgroup_context_get_mask(c);
}
-CGroupControllerMask unit_get_members_mask(Unit *u) {
+CGroupMask unit_get_members_mask(Unit *u) {
assert(u);
+ /* Returns the mask of controllers all of the unit's children
+ * require, merged */
+
if (u->cgroup_members_mask_valid)
return u->cgroup_members_mask;
continue;
u->cgroup_members_mask |=
- unit_get_cgroup_mask(member) |
+ unit_get_own_mask(member) |
unit_get_members_mask(member);
}
}
return u->cgroup_members_mask;
}
-CGroupControllerMask unit_get_siblings_mask(Unit *u) {
+CGroupMask unit_get_siblings_mask(Unit *u) {
assert(u);
+ /* Returns the mask of controllers all of the unit's siblings
+ * require, i.e. the members mask of the unit's parent slice
+ * if there is one. */
+
if (UNIT_ISSET(u->slice))
return unit_get_members_mask(UNIT_DEREF(u->slice));
- return unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+ return unit_get_own_mask(u) | unit_get_members_mask(u);
}
-CGroupControllerMask unit_get_target_mask(Unit *u) {
- CGroupControllerMask mask;
+CGroupMask unit_get_subtree_mask(Unit *u) {
+
+ /* Returns the mask of this subtree, meaning of the group
+ * itself and its children. */
+
+ return unit_get_own_mask(u) | unit_get_members_mask(u);
+}
+
+CGroupMask unit_get_target_mask(Unit *u) {
+ CGroupMask mask;
+
+ /* This returns the cgroup mask of all controllers to enable
+ * for a specific cgroup, i.e. everything it needs itself,
+ * plus all that its children need, plus all that its siblings
+ * need. This is primarily useful on the legacy cgroup
+ * hierarchy, where we need to duplicate each cgroup in each
+ * hierarchy that shall be enabled for it. */
- mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
+ mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
+ mask &= u->manager->cgroup_supported;
+
+ return mask;
+}
+
+CGroupMask unit_get_enable_mask(Unit *u) {
+ CGroupMask mask;
+
+ /* This returns the cgroup mask of all controllers to enable
+ * for the children of a specific cgroup. This is primarily
+ * useful for the unified cgroup hierarchy, where each cgroup
+ * controls which controllers are enabled for its children. */
+
+ mask = unit_get_members_mask(u);
mask &= u->manager->cgroup_supported;
return mask;
/* Recurse from a unit up through its containing slices, propagating
* mask bits upward. A unit is also member of itself. */
void unit_update_cgroup_members_masks(Unit *u) {
- CGroupControllerMask m;
+ CGroupMask m;
bool more;
assert(u);
/* Calculate subtree mask */
- m = unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+ m = unit_get_subtree_mask(u);
/* See if anything changed from the previous invocation. If
* not, we're done. */
}
}
-static const char *migrate_callback(CGroupControllerMask mask, void *userdata) {
+static const char *migrate_callback(CGroupMask mask, void *userdata) {
Unit *u = userdata;
assert(mask != 0);
return NULL;
}
-static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
+char *unit_default_cgroup_path(Unit *u) {
+ _cleanup_free_ char *escaped = NULL, *slice = NULL;
+ int r;
+
+ assert(u);
+
+ if (unit_has_name(u, SPECIAL_ROOT_SLICE))
+ return strdup(u->manager->cgroup_root);
+
+ if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
+ r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
+ if (r < 0)
+ return NULL;
+ }
+
+ escaped = cg_escape(u->id);
+ if (!escaped)
+ return NULL;
+
+ if (slice)
+ return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
+ else
+ return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
+}
+
+int unit_set_cgroup_path(Unit *u, const char *path) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(u);
+
+ if (path) {
+ p = strdup(path);
+ if (!p)
+ return -ENOMEM;
+ } else
+ p = NULL;
+
+ if (streq_ptr(u->cgroup_path, p))
+ return 0;
+
+ if (p) {
+ r = hashmap_put(u->manager->cgroup_unit, p, u);
+ if (r < 0)
+ return r;
+ }
+
+ unit_release_cgroup(u);
+
+ u->cgroup_path = p;
+ p = NULL;
+
+ return 1;
+}
+
+int unit_watch_cgroup(Unit *u) {
+ _cleanup_free_ char *populated = NULL;
+ int r;
+
+ assert(u);
+
+ if (!u->cgroup_path)
+ return 0;
+
+ if (u->cgroup_inotify_wd >= 0)
+ return 0;
+
+ /* Only applies to the unified hierarchy */
+ r = cg_unified();
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed detect wether the unified hierarchy is used: %m");
+ if (r == 0)
+ return 0;
+
+ /* Don't watch the root slice, it's pointless. */
+ if (unit_has_name(u, SPECIAL_ROOT_SLICE))
+ return 0;
+
+ r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
+ if (r < 0)
+ return log_oom();
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated);
+ if (r < 0)
+ return log_oom();
+
+ u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY);
+ if (u->cgroup_inotify_wd < 0) {
+
+ if (errno == ENOENT) /* If the directory is already
+ * gone we don't need to track
+ * it, so this is not an error */
+ return 0;
+
+ return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
+ }
+
+ r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
+
+ return 0;
+}
+
+static int unit_create_cgroup(
+ Unit *u,
+ CGroupMask target_mask,
+ CGroupMask enable_mask) {
+
CGroupContext *c;
int r;
if (!path)
return log_oom();
- r = hashmap_put(u->manager->cgroup_unit, path, u);
- if (r < 0) {
- log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r));
- return r;
- }
- if (r > 0) {
- u->cgroup_path = path;
- path = NULL;
- }
+ r = unit_set_cgroup_path(u, path);
+ if (r == -EEXIST)
+ return log_unit_error_errno(u, r, "Control group %s exists already.", path);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
}
/* First, create our own group */
- r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path);
+ r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
+
+ /* Start watching it */
+ (void) unit_watch_cgroup(u);
+
+ /* Enable all controllers we need */
+ r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
if (r < 0)
- return log_error_errno(r, "Failed to create cgroup %s: %m", u->cgroup_path);
+ log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
/* Keep track that this is now realized */
u->cgroup_realized = true;
- u->cgroup_realized_mask = mask;
+ u->cgroup_realized_mask = target_mask;
if (u->type != UNIT_SLICE && !c->delegate) {
* for slice and delegation units. */
r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
if (r < 0)
- log_warning_errno(r, "Failed to migrate cgroup from to %s: %m", u->cgroup_path);
+ log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
}
return 0;
return 0;
}
-static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) {
+static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) {
assert(u);
- return u->cgroup_realized && u->cgroup_realized_mask == mask;
+ return u->cgroup_realized && u->cgroup_realized_mask == target_mask;
}
/* Check if necessary controllers and attributes for a unit are in place.
*
* Returns 0 on success and < 0 on failure. */
static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
- CGroupControllerMask mask;
+ CGroupMask target_mask, enable_mask;
int r;
assert(u);
u->in_cgroup_queue = false;
}
- mask = unit_get_target_mask(u);
-
- if (unit_has_mask_realized(u, mask))
+ target_mask = unit_get_target_mask(u);
+ if (unit_has_mask_realized(u, target_mask))
return 0;
/* First, realize parents */
}
/* And then do the real work */
- r = unit_create_cgroups(u, mask);
+ enable_mask = unit_get_enable_mask(u);
+ r = unit_create_cgroup(u, target_mask, enable_mask);
if (r < 0)
return r;
/* Finally, apply the necessary attributes. */
- cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path, state);
+ cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, state);
return 0;
}
r = unit_realize_cgroup_now(i, state);
if (r < 0)
- log_warning_errno(r, "Failed to realize cgroups for queued unit %s: %m", i->id);
+ log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
n++;
}
return unit_realize_cgroup_now(u, manager_state(u->manager));
}
-void unit_destroy_cgroup_if_empty(Unit *u) {
+void unit_release_cgroup(Unit *u) {
+ assert(u);
+
+ /* Forgets all cgroup details for this cgroup */
+
+ if (u->cgroup_path) {
+ (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
+ u->cgroup_path = mfree(u->cgroup_path);
+ }
+
+ if (u->cgroup_inotify_wd >= 0) {
+ if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
+ log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
+
+ (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
+ u->cgroup_inotify_wd = -1;
+ }
+}
+
+void unit_prune_cgroup(Unit *u) {
int r;
+ bool is_root_slice;
assert(u);
+ /* Removes the cgroup, if empty and possible, and stops watching it. */
+
if (!u->cgroup_path)
return;
- r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE));
+ is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
+
+ r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
if (r < 0) {
- log_debug_errno(r, "Failed to destroy cgroup %s: %m", u->cgroup_path);
+ log_debug_errno(r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
return;
}
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
+ if (is_root_slice)
+ return;
+
+ unit_release_cgroup(u);
- free(u->cgroup_path);
- u->cgroup_path = NULL;
u->cgroup_realized = false;
u->cgroup_realized_mask = 0;
}
-pid_t unit_search_main_pid(Unit *u) {
+int unit_search_main_pid(Unit *u, pid_t *ret) {
_cleanup_fclose_ FILE *f = NULL;
pid_t pid = 0, npid, mypid;
+ int r;
assert(u);
+ assert(ret);
if (!u->cgroup_path)
- return 0;
+ return -ENXIO;
- if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0)
- return 0;
+ r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
+ if (r < 0)
+ return r;
mypid = getpid();
while (cg_read_pid(f, &npid) > 0) {
if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
continue;
- if (pid != 0) {
+ if (pid != 0)
/* Dang, there's more than one daemonized PID
in this group, so we don't know what process
is the main process. */
- pid = 0;
- break;
- }
+
+ return -ENODATA;
pid = npid;
}
- return pid;
+ *ret = pid;
+ return 0;
+}
+
+static int unit_watch_pids_in_path(Unit *u, const char *path) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int ret = 0, r;
+
+ assert(u);
+ assert(path);
+
+ r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
+ if (r < 0)
+ ret = r;
+ else {
+ pid_t pid;
+
+ while ((r = cg_read_pid(f, &pid)) > 0) {
+ r = unit_watch_pid(u, pid);
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+ } else {
+ char *fn;
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(path, "/", fn, NULL);
+ free(fn);
+
+ if (!p)
+ return -ENOMEM;
+
+ r = unit_watch_pids_in_path(u, p);
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ return ret;
+}
+
+int unit_watch_all_pids(Unit *u) {
+ assert(u);
+
+ /* Adds all PIDs from our cgroup to the set of PIDs we
+ * watch. This is a fallback logic for cases where we do not
+ * get reliable cgroup empty notifications: we try to use
+ * SIGCHLD as replacement. */
+
+ if (!u->cgroup_path)
+ return -ENOENT;
+
+ if (cg_unified() > 0) /* On unified we can use proper notifications */
+ return 0;
+
+ return unit_watch_pids_in_path(u, u->cgroup_path);
+}
+
+int unit_notify_cgroup_empty(Unit *u) {
+ int r;
+
+ assert(u);
+
+ if (!u->cgroup_path)
+ return 0;
+
+ r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
+ if (r <= 0)
+ return r;
+
+ unit_add_to_gc_queue(u);
+
+ if (UNIT_VTABLE(u)->notify_cgroup_empty)
+ UNIT_VTABLE(u)->notify_cgroup_empty(u);
+
+ return 0;
+}
+
+static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *m = userdata;
+
+ assert(s);
+ assert(fd >= 0);
+ assert(m);
+
+ for (;;) {
+ union inotify_event_buffer buffer;
+ struct inotify_event *e;
+ ssize_t l;
+
+ l = read(fd, &buffer, sizeof(buffer));
+ if (l < 0) {
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
+
+ return log_error_errno(errno, "Failed to read control group inotify events: %m");
+ }
+
+ FOREACH_INOTIFY_EVENT(e, buffer, l) {
+ Unit *u;
+
+ if (e->wd < 0)
+ /* Queue overflow has no watch descriptor */
+ continue;
+
+ if (e->mask & IN_IGNORED)
+ /* The watch was just removed */
+ continue;
+
+ u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
+ if (!u) /* Not that inotify might deliver
+ * events for a watch even after it
+ * was removed, because it was queued
+ * before the removal. Let's ignore
+ * this here safely. */
+ continue;
+
+ (void) unit_notify_cgroup_empty(u);
+ }
+ }
}
int manager_setup_cgroup(Manager *m) {
_cleanup_free_ char *path = NULL;
- int r;
+ CGroupController c;
+ int r, unified;
+ char *e;
assert(m);
/* 1. Determine hierarchy */
- free(m->cgroup_root);
- m->cgroup_root = NULL;
-
+ m->cgroup_root = mfree(m->cgroup_root);
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
if (r < 0)
return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
- /* LEGACY: Already in /system.slice? If so, let's cut this
- * off. This is to support live upgrades from older systemd
- * versions where PID 1 was moved there. */
- if (m->running_as == MANAGER_SYSTEM) {
- char *e;
+ /* Chop off the init scope, if we are already located in it */
+ e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
+ /* LEGACY: Also chop off the system slice if we are in
+ * it. This is to support live upgrades from older systemd
+ * versions where PID 1 was moved there. Also see
+ * cg_get_root_path(). */
+ if (!e && m->running_as == MANAGER_SYSTEM) {
e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
if (!e)
- e = endswith(m->cgroup_root, "/system");
- if (e)
- *e = 0;
+ e = endswith(m->cgroup_root, "/system"); /* even more legacy */
}
+ if (e)
+ *e = 0;
/* And make sure to store away the root value without trailing
* slash, even for the root dir, so that we can easily prepend
* it everywhere. */
- if (streq(m->cgroup_root, "/"))
- m->cgroup_root[0] = 0;
+ while ((e = endswith(m->cgroup_root, "/")))
+ *e = 0;
/* 2. Show data */
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
if (r < 0)
return log_error_errno(r, "Cannot find cgroup mount point: %m");
- log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+ unified = cg_unified();
+ if (unified < 0)
+ return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
+ if (unified > 0)
+ log_debug("Unified cgroup hierarchy is located at %s.", path);
+ else
+ log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+
if (!m->test_run) {
+ const char *scope_path;
/* 3. Install agent */
- if (m->running_as == MANAGER_SYSTEM) {
+ if (unified) {
+
+ /* In the unified hierarchy we can can get
+ * cgroup empty notifications via inotify. */
+
+ m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
+ safe_close(m->cgroup_inotify_fd);
+
+ m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
+ if (m->cgroup_inotify_fd < 0)
+ return log_error_errno(errno, "Failed to create control group inotify object: %m");
+
+ r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to watch control group inotify object: %m");
+
+ r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_IDLE - 5);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set priority of inotify event source: %m");
+
+ (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
+
+ } else if (m->running_as == MANAGER_SYSTEM) {
+
+ /* On the legacy hierarchy we only get
+ * notifications via cgroup agents. (Which
+ * isn't really reliable, since it does not
+ * generate events when control groups with
+ * children run empty. */
+
r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
if (r < 0)
log_warning_errno(r, "Failed to install release agent, ignoring: %m");
else if (r > 0)
log_debug("Installed release agent.");
- else
+ else if (r == 0)
log_debug("Release agent already installed.");
}
- /* 4. Make sure we are in the root cgroup */
- r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0);
+ /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
+ scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
if (r < 0)
- return log_error_errno(r, "Failed to create root cgroup hierarchy: %m");
+ return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
+
+ /* also, move all other userspace processes remaining
+ * in the root cgroup into that scope. */
+ r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, false);
+ if (r < 0)
+ log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
/* 5. And pin it, so that it cannot be unmounted */
safe_close(m->pin_cgroupfs_fd);
-
m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
if (m->pin_cgroupfs_fd < 0)
return log_error_errno(errno, "Failed to open pin file: %m");
/* 6. Always enable hierarchical support if it exists... */
- cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
+ if (!unified)
+ (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
}
/* 7. Figure out which controllers are supported */
- m->cgroup_supported = cg_mask_supported();
+ r = cg_mask_supported(&m->cgroup_supported);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine supported controllers: %m");
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
+ log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & c));
return 0;
}
/* We can't really delete the group, since we are in it. But
* let's trim it. */
if (delete && m->cgroup_root)
- cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
+ (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
+
+ m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
+
+ m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
+ m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
- free(m->cgroup_root);
- m->cgroup_root = NULL;
+ m->cgroup_root = mfree(m->cgroup_root);
}
Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
char *e;
e = strrchr(p, '/');
- if (e == p || !e)
- return NULL;
+ if (!e || e == p)
+ return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
*e = 0;
assert(m);
- if (pid <= 1)
+ if (pid <= 0)
return NULL;
+ if (pid == 1)
+ return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
+
u = hashmap_get(m->watch_pids1, LONG_TO_PTR(pid));
if (u)
return u;
int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
Unit *u;
- int r;
assert(m);
assert(cgroup);
if (!u)
return 0;
- r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
- if (r <= 0)
- return r;
-
- if (UNIT_VTABLE(u)->notify_cgroup_empty)
- UNIT_VTABLE(u)->notify_cgroup_empty(u);
-
- unit_add_to_gc_queue(u);
- return 0;
+ return unit_notify_cgroup_empty(u);
}
int unit_get_memory_current(Unit *u, uint64_t *ret) {
if (!u->cgroup_path)
return -ENODATA;
- if ((u->cgroup_realized_mask & CGROUP_MEMORY) == 0)
+ if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
return -ENODATA;
- r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
+ if (cg_unified() <= 0)
+ r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
+ else
+ r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
if (!u->cgroup_path)
return -ENODATA;
- if ((u->cgroup_realized_mask & CGROUP_CPUACCT) == 0)
+ if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
return -ENODATA;
r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
void cgroup_context_init(CGroupContext *c);
void cgroup_context_done(CGroupContext *c);
void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix);
-void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state);
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state);
-CGroupControllerMask cgroup_context_get_mask(CGroupContext *c);
+CGroupMask cgroup_context_get_mask(CGroupContext *c);
void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
-CGroupControllerMask unit_get_cgroup_mask(Unit *u);
-CGroupControllerMask unit_get_siblings_mask(Unit *u);
-CGroupControllerMask unit_get_members_mask(Unit *u);
-CGroupControllerMask unit_get_target_mask(Unit *u);
+CGroupMask unit_get_own_mask(Unit *u);
+CGroupMask unit_get_siblings_mask(Unit *u);
+CGroupMask unit_get_members_mask(Unit *u);
+CGroupMask unit_get_subtree_mask(Unit *u);
+
+CGroupMask unit_get_target_mask(Unit *u);
+CGroupMask unit_get_enable_mask(Unit *u);
void unit_update_cgroup_members_masks(Unit *u);
+
+char *unit_default_cgroup_path(Unit *u);
+int unit_set_cgroup_path(Unit *u, const char *path);
+
int unit_realize_cgroup(Unit *u);
-void unit_destroy_cgroup_if_empty(Unit *u);
+void unit_release_cgroup(Unit *u);
+void unit_prune_cgroup(Unit *u);
+int unit_watch_cgroup(Unit *u);
+
int unit_attach_pids_to_cgroup(Unit *u);
int manager_setup_cgroup(Manager *m);
Unit *manager_get_unit_by_cgroup(Manager *m, const char *cgroup);
Unit* manager_get_unit_by_pid(Manager *m, pid_t pid);
-pid_t unit_search_main_pid(Unit *u);
-
-int manager_notify_cgroup_empty(Manager *m, const char *group);
+int unit_search_main_pid(Unit *u, pid_t *ret);
+int unit_watch_all_pids(Unit *u);
int unit_get_memory_current(Unit *u, uint64_t *ret);
int unit_get_cpu_usage(Unit *u, nsec_t *ret);
bool unit_cgroup_delegate(Unit *u);
+int unit_notify_cgroup_empty(Unit *u);
+int manager_notify_cgroup_empty(Manager *m, const char *group);
+
const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
if (mode != UNIT_CHECK) {
c->cpu_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_CPUACCT;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPUACCT;
unit_write_drop_in_private(u, mode, name, b ? "CPUAccounting=yes" : "CPUAccounting=no");
}
if (mode != UNIT_CHECK) {
c->cpu_shares = ul;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, name, "CPUShares=%lu", ul);
}
if (mode != UNIT_CHECK) {
c->startup_cpu_shares = ul;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, name, "StartupCPUShares=%lu", ul);
}
if (mode != UNIT_CHECK) {
c->cpu_quota_per_sec_usec = u64;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, "CPUQuota", "CPUQuota=%0.f%%", (double) (c->cpu_quota_per_sec_usec / 10000));
}
if (mode != UNIT_CHECK) {
c->blockio_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private(u, mode, name, b ? "BlockIOAccounting=yes" : "BlockIOAccounting=no");
}
if (mode != UNIT_CHECK) {
c->blockio_weight = ul;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "BlockIOWeight=%lu", ul);
}
if (mode != UNIT_CHECK) {
c->startup_blockio_weight = ul;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "StartupBlockIOWeight=%lu", ul);
}
cgroup_context_free_blockio_device_bandwidth(c, a);
}
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
}
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
if (mode != UNIT_CHECK) {
c->memory_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_MEMORY;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_MEMORY;
unit_write_drop_in_private(u, mode, name, b ? "MemoryAccounting=yes" : "MemoryAccounting=no");
}
if (mode != UNIT_CHECK) {
c->memory_limit = limit;
- u->cgroup_realized_mask &= ~CGROUP_MEMORY;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_MEMORY;
unit_write_drop_in_private_format(u, mode, name, "%s=%" PRIu64, name, limit);
}
char *buf;
c->device_policy = p;
- u->cgroup_realized_mask &= ~CGROUP_DEVICE;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_DEVICE;
buf = strjoina("DevicePolicy=", policy);
unit_write_drop_in_private(u, mode, name, buf);
cgroup_context_free_device_allow(c, c->device_allow);
}
- u->cgroup_realized_mask &= ~CGROUP_DEVICE;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_DEVICE;
f = open_memstream(&buf, &size);
if (!f)
#include "cgroup-util.h"
#include "strv.h"
#include "bus-common-errors.h"
+#include "special.h"
#include "dbus.h"
#include "dbus-unit.h"
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
if (u->type == UNIT_SLICE)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
r = sd_bus_message_read(message, "s", &s);
if (r < 0)
bool apply_tty_stdin;
bool confirm_spawn;
bool selinux_context_net;
- CGroupControllerMask cgroup_supported;
+ CGroupMask cgroup_supported;
const char *cgroup_path;
bool cgroup_delegate;
const char *runtime_prefix;
m->idle_pipe[0] = m->idle_pipe[1] = m->idle_pipe[2] = m->idle_pipe[3] = -1;
- m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd = m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = m->utab_inotify_fd = -1;
+ m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd =
+ m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = m->utab_inotify_fd =
+ m->cgroup_inotify_fd = -1;
m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
m->ask_password_inotify_fd = -1;
SET_FOREACH(u, m->startup_units, i)
if (u->cgroup_path)
- cgroup_context_apply(unit_get_cgroup_context(u), unit_get_cgroup_mask(u), u->cgroup_path, manager_state(m));
+ cgroup_context_apply(unit_get_cgroup_context(u), unit_get_own_mask(u), u->cgroup_path, manager_state(m));
}
static int create_generator_dir(Manager *m, char **generator, const char *name) {
/* Data specific to the cgroup subsystem */
Hashmap *cgroup_unit;
- CGroupControllerMask cgroup_supported;
+ CGroupMask cgroup_supported;
char *cgroup_root;
- int gc_marker;
- unsigned n_in_gc_queue;
+ /* Notifications from cgroups, when the unified hierarchy is
+ * used is done via inotify. */
+ int cgroup_inotify_fd;
+ sd_event_source *cgroup_inotify_event_source;
+ Hashmap *cgroup_inotify_wd_unit;
/* Make sure the user cannot accidentally unmount our cgroup
* file system */
int pin_cgroupfs_fd;
+ int gc_marker;
+ unsigned n_in_gc_queue;
+
/* Flags */
ManagerRunningAs running_as;
ManagerExitCode exit_code:5;
#endif
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ { "cgroup", "/sys/fs/cgroup", "cgroup", "__DEVEL__sane_behavior", MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ cg_is_unified_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
- NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV,
- NULL, MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_IN_CONTAINER },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
- NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
NULL, MNT_NONE },
#ifdef ENABLE_EFI
_cleanup_set_free_free_ Set *controllers = NULL;
int r;
+ if (!cg_is_legacy_wanted())
+ return 0;
+
/* Mount all available cgroup controllers that are built into the kernel. */
controllers = set_new(&string_hash_ops);
#include <errno.h>
#include <unistd.h>
-#include "unit.h"
-#include "scope.h"
#include "log.h"
-#include "dbus-scope.h"
+#include "strv.h"
#include "special.h"
#include "unit-name.h"
+#include "unit.h"
+#include "scope.h"
+#include "dbus-scope.h"
#include "load-dropin.h"
static const UnitActiveState state_translation_table[_SCOPE_STATE_MAX] = {
if (UNIT(s)->load_state != UNIT_LOADED)
return 0;
- if (set_isempty(UNIT(s)->pids) && UNIT(s)->manager->n_reloading <= 0) {
+ if (set_isempty(UNIT(s)->pids) &&
+ !manager_is_reloading_or_reexecuting(UNIT(s)->manager) <= 0 &&
+ !unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE)) {
log_unit_error(UNIT(s), "Scope has no PIDs. Refusing.");
return -EINVAL;
}
assert(s);
assert(u->load_state == UNIT_STUB);
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
+ if (!u->transient && !manager_is_reloading_or_reexecuting(u->manager))
return -ENOENT;
u->load_state = UNIT_LOADED;
assert(s);
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE))
+ return -EPERM;
+
if (s->state == SCOPE_FAILED)
return -EPERM;
assert(s->state == SCOPE_DEAD);
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
+ if (!u->transient && !manager_is_reloading_or_reexecuting(u->manager))
return -ENOENT;
(void) unit_realize_cgroup(u);
int scope_abandon(Scope *s) {
assert(s);
+ if (unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE))
+ return -EPERM;
+
if (!IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED))
return -ESTALE;
return scope_state_to_string(SCOPE(u)->state);
}
+static int scope_enumerate(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ /* Let's unconditionally add the "init.scope" special unit
+ * that encapsulates PID 1. Note that PID 1 already is in the
+ * cgroup for this, we hence just need to allocate the object
+ * for it and that's it. */
+
+ u = manager_get_unit(m, SPECIAL_INIT_SCOPE);
+ if (!u) {
+ u = unit_new(m, sizeof(Scope));
+ if (!u)
+ return log_oom();
+
+ r = unit_add_name(u, SPECIAL_INIT_SCOPE);
+ if (r < 0) {
+ unit_free(u);
+ return log_error_errno(r, "Failed to add init.scope name");
+ }
+ }
+
+ u->transient = true;
+ u->default_dependencies = false;
+ u->no_gc = true;
+ SCOPE(u)->deserialized_state = SCOPE_RUNNING;
+ SCOPE(u)->kill_context.kill_signal = SIGRTMIN+14;
+
+ /* Prettify things, if we can. */
+ if (!u->description)
+ u->description = strdup("System and Service Manager");
+ if (!u->documentation)
+ (void) strv_extend(&u->documentation, "man:systemd(1)");
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+}
+
static const char* const scope_state_table[_SCOPE_STATE_MAX] = {
[SCOPE_DEAD] = "dead",
[SCOPE_RUNNING] = "running",
.bus_set_property = bus_scope_set_property,
.bus_commit_properties = bus_scope_commit_properties,
- .can_transient = true
+ .can_transient = true,
+
+ .enumerate = scope_enumerate,
};
}
static int service_search_main_pid(Service *s) {
- pid_t pid;
+ pid_t pid = 0;
int r;
assert(s);
assert(s->main_pid <= 0);
- pid = unit_search_main_pid(UNIT(s));
- if (pid <= 0)
- return -ENOENT;
+ r = unit_search_main_pid(UNIT(s), &pid);
+ if (r < 0)
+ return r;
log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
r = service_set_main_pid(s, pid);
/* For the inactive states unit_notify() will trim the cgroup,
* but for exit we have to do that ourselves... */
if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0)
- unit_destroy_cgroup_if_empty(UNIT(s));
+ unit_prune_cgroup(UNIT(s));
/* For remain_after_exit services, let's see if we can "release" the
* hold on the console, since unit_notify() only does that in case of
break;
}
} else
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
service_enter_start_post(s);
break;
break;
}
} else
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
service_enter_running(s, SERVICE_SUCCESS);
break;
case SERVICE_RELOAD:
if (f == SERVICE_SUCCESS) {
service_load_pid_file(s, true);
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
}
s->reload_result = f;
#include <errno.h>
-#include "unit.h"
-#include "slice.h"
#include "log.h"
-#include "dbus-slice.h"
+#include "strv.h"
#include "special.h"
#include "unit-name.h"
+#include "unit.h"
+#include "slice.h"
+#include "dbus-slice.h"
static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
[SLICE_DEAD] = UNIT_INACTIVE,
return slice_state_to_string(SLICE(u)->state);
}
+static int slice_enumerate(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
+ if (!u) {
+ u = unit_new(m, sizeof(Slice));
+ if (!u)
+ return log_oom();
+
+ r = unit_add_name(u, SPECIAL_ROOT_SLICE);
+ if (r < 0) {
+ unit_free(u);
+ return log_error_errno(r, "Failed to add -.slice name");
+ }
+ }
+
+ u->default_dependencies = false;
+ u->no_gc = true;
+ SLICE(u)->deserialized_state = SLICE_ACTIVE;
+
+ if (!u->description)
+ u->description = strdup("Root Slice");
+ if (!u->documentation)
+ (void) strv_extend(&u->documentation, "man:systemd.special(7)");
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+}
+
static const char* const slice_state_table[_SLICE_STATE_MAX] = {
[SLICE_DEAD] = "dead",
[SLICE_ACTIVE] = "active"
.bus_set_property = bus_slice_set_property,
.bus_commit_properties = bus_slice_commit_properties,
+ .enumerate = slice_enumerate,
+
.status_message_formats = {
.finished_start_job = {
[JOB_DONE] = "Created slice %s.",
u->unit_file_state = _UNIT_FILE_STATE_INVALID;
u->unit_file_preset = -1;
u->on_failure_job_mode = JOB_REPLACE;
+ u->cgroup_inotify_wd = -1;
RATELIMIT_INIT(u->auto_stop_ratelimit, 10 * USEC_PER_SEC, 16);
if (u->in_cgroup_queue)
LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
- if (u->cgroup_path) {
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
- free(u->cgroup_path);
- }
+ unit_release_cgroup(u);
manager_update_failed_units(u->manager, u, false);
set_remove(u->manager->startup_units, u);
/* Make sure the cgroup is always removed when we become inactive */
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
- unit_destroy_cgroup_if_empty(u);
+ unit_prune_cgroup(u);
/* Note that this doesn't apply to RemainAfterExit services exiting
* successfully, since there's no change of state in that case. Which is
while (!set_isempty(u->pids))
unit_unwatch_pid(u, PTR_TO_LONG(set_first(u->pids)));
- set_free(u->pids);
- u->pids = NULL;
-}
-
-static int unit_watch_pids_in_path(Unit *u, const char *path) {
- _cleanup_closedir_ DIR *d = NULL;
- _cleanup_fclose_ FILE *f = NULL;
- int ret = 0, r;
-
- assert(u);
- assert(path);
-
- /* Adds all PIDs from a specific cgroup path to the set of PIDs we watch. */
-
- r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
- if (r >= 0) {
- pid_t pid;
-
- while ((r = cg_read_pid(f, &pid)) > 0) {
- r = unit_watch_pid(u, pid);
- if (r < 0 && ret >= 0)
- ret = r;
- }
- if (r < 0 && ret >= 0)
- ret = r;
-
- } else if (ret >= 0)
- ret = r;
-
- r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
- if (r >= 0) {
- char *fn;
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- _cleanup_free_ char *p = NULL;
-
- p = strjoin(path, "/", fn, NULL);
- free(fn);
-
- if (!p)
- return -ENOMEM;
-
- r = unit_watch_pids_in_path(u, p);
- if (r < 0 && ret >= 0)
- ret = r;
- }
- if (r < 0 && ret >= 0)
- ret = r;
-
- } else if (ret >= 0)
- ret = r;
-
- return ret;
-}
-
-int unit_watch_all_pids(Unit *u) {
- assert(u);
-
- /* Adds all PIDs from our cgroup to the set of PIDs we watch */
-
- if (!u->cgroup_path)
- return -ENOENT;
-
- return unit_watch_pids_in_path(u, u->cgroup_path);
+ u->pids = set_free(u->pids);
}
void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2) {
return unit_dbus_path_from_name(u->id);
}
-char *unit_default_cgroup_path(Unit *u) {
- _cleanup_free_ char *escaped = NULL, *slice = NULL;
- int r;
-
- assert(u);
-
- if (unit_has_name(u, SPECIAL_ROOT_SLICE))
- return strdup(u->manager->cgroup_root);
-
- if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
- r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
- if (r < 0)
- return NULL;
- }
-
- escaped = cg_escape(u->id);
- if (!escaped)
- return NULL;
-
- if (slice)
- return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
- else
- return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
-}
-
int unit_set_slice(Unit *u, Unit *slice) {
assert(u);
assert(slice);
if (slice->type != UNIT_SLICE)
return -EINVAL;
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE) &&
+ !unit_has_name(slice, SPECIAL_ROOT_SLICE))
+ return -EPERM;
+
if (UNIT_DEREF(u->slice) == slice)
return 0;
slice_name = b;
} else
slice_name =
- u->manager->running_as == MANAGER_SYSTEM
+ u->manager->running_as == MANAGER_SYSTEM && !unit_has_name(u, SPECIAL_INIT_SCOPE)
? SPECIAL_SYSTEM_SLICE
: SPECIAL_ROOT_SLICE;
fprintf(f, "%s=%s\n", key, value);
}
-static int unit_set_cgroup_path(Unit *u, const char *path) {
- _cleanup_free_ char *p = NULL;
- int r;
-
- assert(u);
-
- if (path) {
- p = strdup(path);
- if (!p)
- return -ENOMEM;
- } else
- p = NULL;
-
- if (streq_ptr(u->cgroup_path, p))
- return 0;
-
- if (p) {
- r = hashmap_put(u->manager->cgroup_unit, p, u);
- if (r < 0)
- return r;
- }
-
- if (u->cgroup_path) {
- log_unit_debug(u, "Changing cgroup path from %s to %s.", u->cgroup_path, strna(p));
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
- free(u->cgroup_path);
- }
-
- u->cgroup_path = p;
- p = NULL;
-
- return 0;
-}
-
int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
ExecRuntime **rt = NULL;
size_t offset;
if (r < 0)
log_unit_debug_errno(u, r, "Failed to set cgroup path %s, ignoring: %m", v);
+ (void) unit_watch_cgroup(u);
+
continue;
} else if (streq(l, "cgroup-realized")) {
int b;
} else if (r > 0) {
- /* FIXME: For now, we will not wait for the
- * cgroup members to die if we are running in
- * a container or if this is a delegation
- * unit, simply because cgroup notification is
- * unreliable in these cases. It doesn't work
- * at all in containers, and outside of
- * containers it can be confused easily by
- * left-over directories in the cgroup --
- * which however should not exist in
- * non-delegated units. */
-
- if (detect_container(NULL) == 0 && !unit_cgroup_delegate(u))
+ /* FIXME: For now, on the legacy hierarchy, we
+ * will not wait for the cgroup members to die
+ * if we are running in a container or if this
+ * is a delegation unit, simply because cgroup
+ * notification is unreliable in these
+ * cases. It doesn't work at all in
+ * containers, and outside of containers it
+ * can be confused easily by left-over
+ * directories in the cgroup -- which however
+ * should not exist in non-delegated units. On
+ * the unified hierarchy that's different,
+ * there we get proper events. Hence rely on
+ * them.*/
+
+ if (cg_unified() > 0 ||
+ (detect_container(NULL) == 0 && !unit_cgroup_delegate(u)))
wait_for_exit = true;
if (c->send_sighup && k != KILL_KILL) {
/* Counterparts in the cgroup filesystem */
char *cgroup_path;
- CGroupControllerMask cgroup_realized_mask;
- CGroupControllerMask cgroup_subtree_mask;
- CGroupControllerMask cgroup_members_mask;
+ CGroupMask cgroup_realized_mask;
+ CGroupMask cgroup_subtree_mask;
+ CGroupMask cgroup_members_mask;
+ int cgroup_inotify_wd;
/* How to start OnFailure units */
JobMode on_failure_job_mode;
int unit_watch_pid(Unit *u, pid_t pid);
void unit_unwatch_pid(Unit *u, pid_t pid);
-int unit_watch_all_pids(Unit *u);
void unit_unwatch_all_pids(Unit *u);
void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
int unit_add_default_target_dependency(Unit *u, Unit *target);
-char *unit_default_cgroup_path(Unit *u);
-
void unit_start_on_failure(Unit *u);
void unit_trigger_notify(Unit *u);
static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
static bool arg_userns = false;
static int arg_kill_signal = 0;
+static bool arg_unified_cgroup_hierarchy = false;
static void help(void) {
printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
return 0;
}
+static int detect_unified_cgroup_hierarchy(void) {
+ const char *e;
+ int r;
+
+ /* Allow the user to control whether the unified hierarchy is used */
+ e = getenv("UNIFIED_CGROUP_HIERARCHY");
+ if (e) {
+ r = parse_boolean(e);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
+
+ arg_unified_cgroup_hierarchy = r;
+ return 0;
+ }
+
+ /* Otherwise inherit the default from the host system */
+ r = cg_unified();
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
+
+ arg_unified_cgroup_hierarchy = r;
+ return 0;
+}
+
static int parse_argv(int argc, char *argv[]) {
enum {
if (arg_boot && arg_kill_signal <= 0)
arg_kill_signal = SIGRTMIN+3;
+ r = detect_unified_cgroup_hierarchy();
+ if (r < 0)
+ return r;
+
return 1;
}
{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */
{ NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */
{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false },
- { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, true, false },
{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false },
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
return 0;
}
-static int mount_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
+static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
char *to;
int r;
return 1;
}
-static int mount_cgroup(const char *dest) {
+static int mount_legacy_cgroups(const char *dest) {
_cleanup_set_free_free_ Set *controllers = NULL;
const char *cgroup_root;
int r;
+ cgroup_root = prefix_roota(dest, "/sys/fs/cgroup");
+
+ /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */
+ r = path_is_mount_point(cgroup_root, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m");
+ if (r == 0) {
+ _cleanup_free_ char *options = NULL;
+
+ r = tmpfs_patch_options("mode=755", &options);
+ if (r < 0)
+ return log_oom();
+
+ if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options) < 0)
+ return log_error_errno(errno, "Failed to mount /sys/fs/cgroup: %m");
+ }
+
+ if (cg_unified() > 0)
+ goto skip_controllers;
+
controllers = set_new(&string_hash_ops);
if (!controllers)
return log_oom();
if (r == -EINVAL) {
/* Not a symbolic link, but directly a single cgroup hierarchy */
- r = mount_cgroup_hierarchy(dest, controller, controller, true);
+ r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true);
if (r < 0)
return r;
continue;
}
- r = mount_cgroup_hierarchy(dest, combined, combined, true);
+ r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true);
if (r < 0)
return r;
}
}
- r = mount_cgroup_hierarchy(dest, "name=systemd,xattr", "systemd", false);
+skip_controllers:
+ r = mount_legacy_cgroup_hierarchy(dest, "none,name=systemd,xattr", "systemd", false);
if (r < 0)
return r;
- cgroup_root = prefix_roota(dest, "/sys/fs/cgroup");
if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
return 0;
}
+static int mount_unified_cgroups(const char *dest) {
+ const char *p;
+ int r;
+
+ assert(dest);
+
+ p = strjoina(dest, "/sys/fs/cgroup");
+
+ r = path_is_mount_point(p, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p);
+ if (r > 0) {
+ p = strjoina(dest, "/sys/fs/cgroup/cgroup.procs");
+ if (access(p, F_OK) >= 0)
+ return 0;
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to determine if mount point %s contains the unified cgroup hierarchy: %m", p);
+
+ log_error("%s is already mounted but not a unified cgroup hierarchy. Refusing.", p);
+ return -EINVAL;
+ }
+
+ if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0)
+ return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p);
+
+ return 0;
+}
+
+static int mount_cgroups(const char *dest) {
+ if (arg_unified_cgroup_hierarchy)
+ return mount_unified_cgroups(dest);
+ else
+ return mount_legacy_cgroups(dest);
+}
+
static int mount_systemd_cgroup_writable(const char *dest) {
_cleanup_free_ char *own_cgroup_path = NULL;
const char *systemd_root, *systemd_own;
if (r < 0)
return log_error_errno(r, "Failed to determine our own cgroup path: %m");
+ /* If we are living in the top-level, then there's nothing to do... */
+ if (path_equal(own_cgroup_path, "/"))
+ return 0;
+
+ if (arg_unified_cgroup_hierarchy) {
+ systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path);
+ systemd_root = prefix_roota(dest, "/sys/fs/cgroup");
+ } else {
+ systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
+ systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd");
+ }
+
/* Make our own cgroup a (writable) bind mount */
- systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
/* And then remount the systemd cgroup root read-only */
- systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd");
if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
assert(directory);
assert(kmsg_socket >= 0);
+ cg_unified_flush();
+
if (arg_userns) {
/* Tell the parent, that it now can write the UID map. */
(void) barrier_place(barrier); /* #1 */
assert(pid_socket >= 0);
assert(kmsg_socket >= 0);
+ cg_unified_flush();
+
if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
if (r < 0)
return r;
- r = mount_cgroup(directory);
+ r = mount_cgroups(directory);
if (r < 0)
return r;
NULL);
if (pid < 0)
return log_error_errno(errno, "Failed to fork inner child: %m");
-
if (pid == 0) {
pid_socket = safe_close(pid_socket);
uid_shift_socket = safe_close(uid_shift_socket);
if (fd < 0)
return log_error_errno(errno, "Failed to open %s: %m", fs);
- FOREACH_STRING(fn, ".", "tasks", "notify_on_release", "cgroup.procs", "cgroup.clone_children")
+ FOREACH_STRING(fn,
+ ".",
+ "tasks",
+ "notify_on_release",
+ "cgroup.procs",
+ "cgroup.clone_children",
+ "cgroup.controllers",
+ "cgroup.subtree_control",
+ "cgroup.populated")
if (fchownat(fd, fn, arg_uid_shift, arg_uid_shift, 0) < 0)
- log_warning_errno(errno, "Failed to chown() cgroup file %s, ignoring: %m", fn);
+ log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
+ "Failed to chown() cgroup file %s, ignoring: %m", fn);
+
+ return 0;
+}
+
+static int sync_cgroup(pid_t pid) {
+ _cleanup_free_ char *cgroup = NULL;
+ char tree[] = "/tmp/unifiedXXXXXX", pid_string[DECIMAL_STR_MAX(pid) + 1];
+ bool undo_mount = false;
+ const char *fn;
+ int unified, r;
+
+ unified = cg_unified();
+ if (unified < 0)
+ return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m");
+
+ if ((unified > 0) == arg_unified_cgroup_hierarchy)
+ return 0;
+
+ /* When the host uses the legacy cgroup setup, but the
+ * container shall use the unified hierarchy, let's make sure
+ * we copy the path from the name=systemd hierarchy into the
+ * unified hierarchy. Similar for the reverse situation. */
+
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get control group of " PID_FMT ": %m", pid);
+
+ /* In order to access the unified hierarchy we need to mount it */
+ if (!mkdtemp(tree))
+ return log_error_errno(errno, "Failed to generate temporary mount point for unified hierarchy: %m");
+
+ if (unified)
+ r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "none,name=systemd,xattr");
+ else
+ r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior");
+ if (r < 0) {
+ r = log_error_errno(errno, "Failed to mount unified hierarchy: %m");
+ goto finish;
+ }
+
+ undo_mount = true;
+
+ fn = strjoina(tree, cgroup, "/cgroup.procs");
+ (void) mkdir_parents(fn, 0755);
+
+ sprintf(pid_string, PID_FMT, pid);
+ r = write_string_file(fn, pid_string, 0);
+ if (r < 0)
+ log_error_errno(r, "Failed to move process: %m");
+
+finish:
+ if (undo_mount)
+ (void) umount(tree);
+
+ (void) rmdir(tree);
+ return r;
+}
+
+static int create_subcgroup(pid_t pid) {
+ _cleanup_free_ char *cgroup = NULL;
+ const char *child;
+ int unified, r;
+
+ /* In the unified hierarchy inner nodes may only only contain
+ * subgroups, but not processes. Hence, if we running in the
+ * unified hierarchy and the container does the same, and we
+ * did not create a scope unit for the container move us and
+ * the container into two separate subcgroups. */
+
+ if (!arg_keep_unit)
+ return 0;
+
+ if (!arg_unified_cgroup_hierarchy)
+ return 0;
+
+ unified = cg_unified();
+ if (unified < 0)
+ return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m");
+ if (unified == 0)
+ return 0;
+
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get our control group: %m");
+
+ child = strjoina(cgroup, "/payload");
+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, pid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create %s subcgroup: %m", child);
+
+ child = strjoina(cgroup, "/supervisor");
+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create %s subcgroup: %m", child);
return 0;
}
if (r < 0)
goto finish;
+ r = sync_cgroup(pid);
+ if (r < 0)
+ goto finish;
+
+ r = create_subcgroup(pid);
+ if (r < 0)
+ goto finish;
+
r = chown_cgroup(pid);
if (r < 0)
goto finish;
root = UNIT_DEREF(parent->slice);
/* Verify per-unit cgroups settings. */
- assert_se(unit_get_cgroup_mask(son) == (CGROUP_CPU | CGROUP_CPUACCT));
- assert_se(unit_get_cgroup_mask(daughter) == 0);
- assert_se(unit_get_cgroup_mask(grandchild) == 0);
- assert_se(unit_get_cgroup_mask(parent_deep) == CGROUP_MEMORY);
- assert_se(unit_get_cgroup_mask(parent) == CGROUP_BLKIO);
- assert_se(unit_get_cgroup_mask(root) == 0);
+ assert_se(unit_get_own_mask(son) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT));
+ assert_se(unit_get_own_mask(daughter) == 0);
+ assert_se(unit_get_own_mask(grandchild) == 0);
+ assert_se(unit_get_own_mask(parent_deep) == CGROUP_MASK_MEMORY);
+ assert_se(unit_get_own_mask(parent) == CGROUP_MASK_BLKIO);
+ assert_se(unit_get_own_mask(root) == 0);
/* Verify aggregation of member masks */
assert_se(unit_get_members_mask(son) == 0);
assert_se(unit_get_members_mask(daughter) == 0);
assert_se(unit_get_members_mask(grandchild) == 0);
assert_se(unit_get_members_mask(parent_deep) == 0);
- assert_se(unit_get_members_mask(parent) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY));
- assert_se(unit_get_members_mask(root) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_BLKIO | CGROUP_MEMORY));
+ assert_se(unit_get_members_mask(parent) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
+ assert_se(unit_get_members_mask(root) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
/* Verify aggregation of sibling masks. */
- assert_se(unit_get_siblings_mask(son) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY));
- assert_se(unit_get_siblings_mask(daughter) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY));
+ assert_se(unit_get_siblings_mask(son) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
+ assert_se(unit_get_siblings_mask(daughter) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
assert_se(unit_get_siblings_mask(grandchild) == 0);
- assert_se(unit_get_siblings_mask(parent_deep) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY));
- assert_se(unit_get_siblings_mask(parent) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_BLKIO | CGROUP_MEMORY));
- assert_se(unit_get_siblings_mask(root) == (CGROUP_CPU | CGROUP_CPUACCT | CGROUP_BLKIO | CGROUP_MEMORY));
+ assert_se(unit_get_siblings_mask(parent_deep) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
+ assert_se(unit_get_siblings_mask(parent) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
+ assert_se(unit_get_siblings_mask(root) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
/* Verify aggregation of target masks. */
- assert_se(unit_get_target_mask(son) == ((CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY) & m->cgroup_supported));
- assert_se(unit_get_target_mask(daughter) == ((CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY) & m->cgroup_supported));
+ assert_se(unit_get_target_mask(son) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
+ assert_se(unit_get_target_mask(daughter) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
assert_se(unit_get_target_mask(grandchild) == 0);
- assert_se(unit_get_target_mask(parent_deep) == ((CGROUP_CPU | CGROUP_CPUACCT | CGROUP_MEMORY) & m->cgroup_supported));
- assert_se(unit_get_target_mask(parent) == ((CGROUP_CPU | CGROUP_CPUACCT | CGROUP_BLKIO | CGROUP_MEMORY) & m->cgroup_supported));
- assert_se(unit_get_target_mask(root) == ((CGROUP_CPU | CGROUP_CPUACCT | CGROUP_BLKIO | CGROUP_MEMORY) & m->cgroup_supported));
+ assert_se(unit_get_target_mask(parent_deep) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
+ assert_se(unit_get_target_mask(parent) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
+ assert_se(unit_get_target_mask(root) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
manager_free(m);
cg_trim(SYSTEMD_CGROUP_CONTROLLER, "/", false);
- assert_se(cg_delete(SYSTEMD_CGROUP_CONTROLLER, "/test-b") < 0);
- assert_se(cg_delete(SYSTEMD_CGROUP_CONTROLLER, "/test-a") >= 0);
+ assert_se(cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, "/test-b") < 0);
+ assert_se(cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, "/test-a") >= 0);
assert_se(cg_split_spec("foobar:/", &c, &p) == 0);
assert_se(streq(c, "foobar"));
projects / thirdparty / systemd.git / commitdiff
