cgroup-util: drop unused cg_rmdir()

When removing a cgroup, we always want to eliminate subcgroups
first, i.e. use cg_trim(). And cg_rmdir() (along with
CGROUP_REMOVE flag) is simply unused. Kill it.

src/basic/cgroup-util.c

@@ -291,31 +291,6 @@ int cg_read_subgroup(DIR *d, char **ret) {
         return 0;
 }
 
-int cg_rmdir(const char *controller, const char *path) {
-        _cleanup_free_ char *p = NULL;
-        int r;
-
-        r = cg_get_path(controller, path, NULL, &p);
-        if (r < 0)
-                return r;
-
-        r = rmdir(p);
-        if (r < 0 && errno != ENOENT)
-                return -errno;
-
-        r = cg_hybrid_unified();
-        if (r <= 0)
-                return r;
-
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
-                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;
-}
-
 static int cg_kill_items(
                 const char *path,
                 int sig,
@@ -532,12 +507,6 @@ int cg_kill_recursive(
                 }
         }
 
-        if (FLAGS_SET(flags, CGROUP_REMOVE)) {
-                r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, path);
-                if (!IN_SET(r, -ENOENT, -EBUSY))
-                        RET_GATHER(ret, log_debug_errno(r, "Failed to remove cgroup '%s': %m", path));
-        }
-
         return ret;
 }
 

src/basic/cgroup-util.h

@@ -186,9 +186,8 @@ int cg_cgroupid_open(int fsfd, uint64_t id);
 typedef enum CGroupFlags {
         CGROUP_SIGCONT            = 1 << 0,
         CGROUP_IGNORE_SELF        = 1 << 1,
-        CGROUP_REMOVE             = 1 << 2,
-        CGROUP_DONT_SKIP_UNMAPPED = 1 << 3,
-        CGROUP_NO_PIDFD           = 1 << 4,
+        CGROUP_DONT_SKIP_UNMAPPED = 1 << 2,
+        CGROUP_NO_PIDFD           = 1 << 3,
 } CGroupFlags;
 
 int cg_enumerate_processes(const char *controller, const char *path, FILE **ret);
@@ -214,8 +213,6 @@ int cg_get_path_and_check(const char *controller, const char *path, const char *
 int cg_pid_get_path(const char *controller, pid_t pid, char **ret);
 int cg_pidref_get_path(const char *controller, const PidRef *pidref, char **ret);
 
-int cg_rmdir(const char *controller, const char *path);
-
 int cg_is_threaded(const char *path);
 
 int cg_is_delegated(const char *path);

src/shared/cgroup-setup.c

@@ -917,12 +917,6 @@ int cg_migrate_recursive(
         if (r < 0 && ret >= 0)
                 ret = r;
 
-        if (flags & CGROUP_REMOVE) {
-                r = cg_rmdir(cfrom, pfrom);
-                if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY))
-                        return r;
-        }
-
         return ret;
 }
 

src/test/test-cgroup.c

@@ -122,12 +122,7 @@ TEST(cg_create) {
         assert_se(cg_kill_recursive(test_a, 0, 0, NULL, NULL, NULL) > 0);
         assert_se(cg_kill_recursive(test_b, 0, 0, NULL, NULL, NULL) == 0);
 
-        (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, test_b, false);
-
-        assert_se(cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, test_b) == 0);
-        assert_se(cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, test_a) < 0);
-        assert_se(cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, test_a, SYSTEMD_CGROUP_CONTROLLER, here, 0) > 0);
-        assert_se(cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, test_a) == 0);
+        ASSERT_OK(cg_trim(SYSTEMD_CGROUP_CONTROLLER, test_b, true));
 }
 
 TEST(id) {