zdtm: test multiple ext bindmounts with no common root and same master

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

test/zdtm/static/Makefile

@@ -406,6 +406,7 @@ TST_DIR		=				\
 		mntns_pivot_root		\
 		mntns_pivot_root_ro		\
 		mnt_ext_sharing			\
+		mnt_ext_multiple		\
 		mount_complex_sharing		\
 		mnt_tracefs			\
 		mntns_deleted			\

test/zdtm/static/mnt_ext_multiple.c

@@ -0,0 +1,118 @@
+#include <sched.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <linux/limits.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Check multiple non-common root external mounts with same external master";
+const char *test_author = "Pavel Tikhomirov <ptikhomirov@virtuozzo.com>";
+
+char *dirname = "mnt_ext_multiple.test";
+char *source = "zdtm_ext_multiple";
+char *ext_source = "zdtm_ext_multiple.ext";
+TEST_OPTION(dirname, string, "directory name", 1);
+
+int main(int argc, char **argv)
+{
+	char *root, testdir[PATH_MAX];
+	char dst_a[PATH_MAX], dst_b[PATH_MAX];
+	char src[PATH_MAX], src_a[PATH_MAX], src_b[PATH_MAX];
+	char nsdst_a[PATH_MAX], nsdst_b[PATH_MAX];
+	char *tmp = "/tmp/zdtm_ext_multiple.tmp";
+	char *zdtm_newns = getenv("ZDTM_NEWNS");
+
+	root = getenv("ZDTM_ROOT");
+	if (root == NULL) {
+		pr_perror("root");
+		return 1;
+	}
+
+	if (!zdtm_newns) {
+		pr_perror("ZDTM_NEWNS is not set");
+		return 1;
+	} else if (strcmp(zdtm_newns, "1")) {
+		goto test;
+	}
+
+	/* Prepare directories in test root */
+	sprintf(testdir, "%s/%s", root, dirname);
+	mkdir(testdir, 0755);
+	sprintf(dst_a, "%s/%s/dst_a", root, dirname);
+	mkdir(dst_a, 0755);
+	sprintf(dst_b, "%s/%s/dst_b", root, dirname);
+	mkdir(dst_b, 0755);
+
+	/* Prepare directories in criu root */
+	mkdir(tmp, 0755);
+	if (mount(source, tmp, "tmpfs", 0, NULL)) {
+		pr_perror("mount tmpfs");
+		return 1;
+	}
+	if (mount(NULL, tmp, NULL, MS_PRIVATE, NULL)) {
+		pr_perror("make private");
+		return 1;
+	}
+	sprintf(src, "%s/src", tmp);
+	mkdir(src, 0755);
+
+	/* Create a shared mount in criu mntns */
+	if (mount(ext_source, src, "tmpfs", 0, NULL)) {
+		pr_perror("mount tmpfs");
+		return 1;
+	}
+	if (mount(NULL, src, NULL, MS_PRIVATE, NULL)) {
+		pr_perror("make private");
+		return 1;
+	}
+	if (mount(NULL, src, NULL, MS_SHARED, NULL)) {
+		pr_perror("make shared");
+		return 1;
+	}
+
+	/*
+	 * Create temporary mntns, next mounts will not show up in criu mntns
+	 */
+	if (unshare(CLONE_NEWNS)) {
+		pr_perror("unshare");
+		return 1;
+	}
+
+	/*
+	 * Populate to the tests root subdirectories of the src mount
+	 */
+	sprintf(src_a, "%s/src/a", tmp);
+	mkdir(src_a, 0755);
+	if (mount(src_a, dst_a, NULL, MS_BIND, NULL)) {
+		pr_perror("bind");
+		return 1;
+	}
+	sprintf(src_b, "%s/src/b", tmp);
+	mkdir(src_b, 0755);
+	if (mount(src_b, dst_b, NULL, MS_BIND, NULL)) {
+		pr_perror("bind");
+		return 1;
+	}
+
+test:
+	test_init(argc, argv);
+
+	/* Make "external" mounts to have external master */
+	sprintf(nsdst_a, "/%s/dst_a", dirname);
+	if (mount(NULL, nsdst_a, NULL, MS_SLAVE, NULL)) {
+		pr_perror("make slave");
+		return 1;
+	}
+	sprintf(nsdst_b, "/%s/dst_b", dirname);
+	if (mount(NULL, nsdst_b, NULL, MS_SLAVE, NULL)) {
+		pr_perror("make slave");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	pass();
+
+	return 0;
+}

test/zdtm/static/mnt_ext_multiple.desc

@@ -0,0 +1,5 @@
+{   'dopts': '--external mnt[/mnt_ext_multiple.test/dst_a]:MNT_A --external mnt[/mnt_ext_multiple.test/dst_b]:MNT_B',
+    'feature': 'mnt_id move_mount_set_group',
+    'flavor': 'ns uns',
+    'flags': 'suid',
+    'ropts': '--external mnt[MNT_A]:/tmp/zdtm_ext_multiple.tmp/src/a --external mnt[MNT_B]:/tmp/zdtm_ext_multiple.tmp/src/b --no-mntns-compat-mode'}