zdtm: test shared mount propagation is preserved

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm/static/Makefile

@@ -268,6 +268,7 @@ TST_DIR		=				\
 		mnt_ro_bind			\
 		mount_paths			\
 		bind-mount			\
+		shared_mount_propagation	\
 		inotify00			\
 		inotify01			\
 		inotify02			\

test/zdtm/static/shared_mount_propagation.c

+#include <fcntl.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <linux/limits.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check mounts are propagated to shared mounts";
+const char *test_author	= "Pavel Tikhomirov <ptikhomirov@virtuozzo.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "directory name", 1);
+
+int main(int argc, char **argv)
+{
+	char dir_a[PATH_MAX], dir_b[PATH_MAX], dir_c[PATH_MAX];
+	char dir_d[PATH_MAX], dir_e[PATH_MAX], dir_f[PATH_MAX];
+	char test_file[PATH_MAX];
+	char test_bind_file1[PATH_MAX];
+	char test_bind_file2[PATH_MAX];
+	char test_bind_file3[PATH_MAX];
+	int fd;
+
+	test_init(argc, argv);
+
+	mkdir(dirname, 0700);
+
+	if (mount(dirname, dirname, NULL, MS_BIND, NULL)) {
+		pr_perror("Unable to self bind mount %s", dirname);
+		return 1;
+	}
+
+	if (mount(NULL, dirname, NULL, MS_SHARED, NULL)) {
+		pr_perror("Unable to make shared mount %s", dirname);
+		return 1;
+	}
+
+	snprintf(dir_a, sizeof(dir_a), "%s/a", dirname);
+	snprintf(dir_d, sizeof(dir_d), "%s/d", dirname);
+	snprintf(dir_e, sizeof(dir_e), "%s/e", dirname);
+	snprintf(dir_f, sizeof(dir_f), "%s/f", dirname);
+	mkdir(dir_a, 0700);
+	mkdir(dir_d, 0700);
+	mkdir(dir_e, 0700);
+	mkdir(dir_f, 0700);
+
+	snprintf(dir_b, sizeof(dir_a), "%s/b", dir_a);
+	snprintf(dir_c, sizeof(dir_c), "%s/c", dir_b);
+	mkdir(dir_b, 0700);
+	mkdir(dir_c, 0700);
+
+	if (mount(dir_a, dir_d, NULL, MS_BIND, NULL)) {
+		pr_perror("Unable to bind mount %s to %s", dir_a, dir_d);
+		return 1;
+	}
+
+	if (mount(dir_b, dir_e, NULL, MS_BIND, NULL)) {
+		pr_perror("Unable to bind mount %s to %s", dir_b, dir_e);
+		return 1;
+	}
+
+	if (mount(dir_f, dir_c, NULL, MS_BIND, NULL)) {
+		pr_perror("Unable to bind mount %s to %s", dir_f, dir_c);
+		return 1;
+	}
+
+	snprintf(test_file, sizeof(test_file), "%s/file", dir_f);
+	fd = open(test_file, O_CREAT | O_WRONLY | O_EXCL, 0600);
+	if (fd < 0) {
+		pr_perror("Unable to open %s", test_file);
+		return 1;
+	}
+	close(fd);
+
+	test_daemon();
+	test_waitsig();
+
+	snprintf(test_bind_file1, sizeof(test_bind_file1), "%s/file", dir_c);
+	snprintf(test_bind_file2, sizeof(test_bind_file2), "%s/b/c/file", dir_d);
+	snprintf(test_bind_file3, sizeof(test_bind_file3), "%s/c/file", dir_e);
+
+
+	if (access(test_file, F_OK)) {
+		pr_perror("%s doesn't exist", test_file);
+		return 1;
+	}
+
+	if (access(test_bind_file1, F_OK)) {
+		pr_perror("%s doesn't exist", test_bind_file1);
+		return 1;
+	}
+
+	if (access(test_bind_file2, F_OK)) {
+		pr_perror("%s doesn't exist", test_bind_file2);
+		return 1;
+	}
+
+	if (access(test_bind_file3, F_OK)) {
+		pr_perror("%s doesn't exist", test_bind_file3);
+		return 1;
+	}
+
+	if (umount(dir_c)) {
+		pr_perror("Unable to umount %s", dir_c);
+		return 1;
+	}
+
+	if (umount(dir_e)) {
+		pr_perror("Unable to umount %s", dir_e);
+		return 1;
+	}
+
+	if (umount(dir_d)) {
+		pr_perror("Unable to umount %s", dir_d);
+		return 1;
+	}
+
+	pass();
+	return 0;
+}

test/zdtm/static/shared_mount_propagation.desc

+{'flavor': 'ns uns', 'flags': 'suid'}