tests: add a test for cgroup kernel controller props

Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
CC: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/.gitignore

@@ -12,6 +12,7 @@
 /static/cgroup01
 /static/cgroup02
 /static/cgroup03
+/static/cgroup04
 /static/cgroupns
 /static/cgroup_stray
 /static/child_opened_proc

test/zdtm/static/Makefile

@@ -224,6 +224,7 @@ TST_DIR		=				\
 		cgroup01			\
 		cgroup02			\
 		cgroup03			\
+		cgroup04			\
 		cgroup_stray		\
 		unlink_fstat04			\
 		mntns_open			\

test/zdtm/static/cgroup04.c

+
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that some cgroups properties in kernel controllers are preserved";
+const char *test_author	= "Tycho Andersen <tycho.andersen@canonical.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "cgroup directory name", 1);
+static const char *cgname = "zdtmtst";
+
+int write_value(const char *path, const char *value)
+{
+	int fd, l;
+
+	fd = open(path, O_WRONLY);
+	if (fd < 0) {
+		pr_perror("open %s", path);
+		return -1;
+	}
+
+	l = write(fd, value, strlen(value));
+	close(fd);
+	if (l < 0) {
+		pr_perror("failed to write %s to %s", value, path);
+		return -1;
+	}
+
+	return 0;
+}
+
+int mount_and_add(const char *controller, const char *path, const char *prop, const char *value)
+{
+	char aux[1024], paux[1024], subdir[1024];
+
+	if (mkdir(dirname, 0700) < 0 && errno != EEXIST) {
+		pr_perror("Can't make dir");
+		return -1;
+	}
+
+	sprintf(subdir, "%s/%s", dirname, controller);
+	if (mkdir(subdir, 0700) < 0) {
+		pr_perror("Can't make dir");
+		return -1;
+	}
+
+	if (mount("none", subdir, "cgroup", 0, controller)) {
+		pr_perror("Can't mount cgroups");
+		goto err_rd;
+	}
+
+	sprintf(paux, "%s/%s", subdir, path);
+	mkdir(paux, 0600);
+
+	sprintf(paux, "%s/%s/%s", subdir, path, prop);
+	if (write_value(paux, value) < 0)
+		goto err_rs;
+
+	sprintf(aux, "%d", getpid());
+	sprintf(paux, "%s/%s/tasks", subdir, path);
+	/*
+	if (write_value(paux, aux) < 0)
+		goto err_rs;
+	*/
+
+	return 0;
+err_rs:
+	umount(dirname);
+err_rd:
+	rmdir(dirname);
+	return -1;
+}
+
+bool checkval(char *path, char *val)
+{
+	FILE *f;
+	char buf[64];
+
+	f = fopen(path, "r");
+	if (!f) {
+		pr_perror("fopen %s", path);
+		return false;
+	}
+
+	fgets(buf, sizeof(buf), f);
+	fclose(f);
+
+	if (strcmp(val, buf)) {
+		pr_err("got %s expected %s\n", buf, val);
+		return false;
+	}
+
+	return true;
+}
+
+int main(int argc, char **argv)
+{
+	int ret = -1;
+	char path[PATH_MAX];
+
+	test_init(argc, argv);
+
+	if (mount_and_add("devices", cgname, "devices.deny", "a") < 0)
+		goto out;
+
+	/* need to allow /dev/null for restore */
+	sprintf(path, "%s/devices/%s/devices.allow", dirname, cgname);
+	if (write_value(path, "c 1:3 rwm") < 0)
+		goto out;
+
+	if (mount_and_add("memory", cgname, "memory.limit_in_bytes", "268435456") < 0)
+		goto out;
+
+	test_daemon();
+	test_waitsig();
+
+	sprintf(path, "%s/devices/%s/devices.list", dirname, cgname);
+	if (!checkval(path, "c 1:3 rwm\n")) {
+		fail();
+		goto out;
+	}
+
+	sprintf(path, "%s/memory/%s/memory.limit_in_bytes", dirname, cgname);
+	if (!checkval(path, "268435456\n")) {
+		fail();
+		goto out;
+	}
+
+	pass();
+	ret = 0;
+out:
+	sprintf(path, "%s/devices/%s", dirname, cgname);
+	rmdir(path);
+	sprintf(path, "%s/devices", dirname);
+	umount(path);
+
+	sprintf(path, "%s/memory/%s", dirname, cgname);
+	rmdir(path);
+	sprintf(path, "%s/memory", dirname);
+	umount(path);
+
+	return ret;
+}

test/zdtm/static/cgroup04.desc

+{'flavor': 'h', 'flags': 'suid', 'opts': '--manage-cgroups'}