zdtm: fix incorrect open() syscall use for file creation without mode

We saw compilation errors like:

  error: call to ‘__open_missing_mode’ declared with attribute error:
  open with O_CREAT or O_TMPFILE in second argument needs 3 arguments

Let's fix them by adding mode 0777 everywhere.

Before this change the mode was taken randomly from stack (according to
man 2 open) and that is likely not what we want.

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

Author: Snorch

test/zdtm/static/fanotify00.c

@@ -223,7 +223,7 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	del_after = open(fanotify_path, O_CREAT | O_TRUNC);
+	del_after = open(fanotify_path, O_CREAT | O_TRUNC, 0777);
 	if (del_after < 0) {
 		pr_perror("open failed");
 		exit(1);

test/zdtm/static/mountpoints.c

@@ -96,15 +96,15 @@ int main(int argc, char **argv)
 		fail("Can't mount tmpfs");
 		return 1;
 	}
-	tmpfs_fd = open(MPTS_ROOT "/dev/test", O_WRONLY | O_CREAT);
+	tmpfs_fd = open(MPTS_ROOT "/dev/test", O_WRONLY | O_CREAT, 0777);
 	if (write(tmpfs_fd, "hello", 5) <= 0) {
 		pr_perror("write() failed");
 		return 1;
 	}
 
 	/* Check that over-mounted files are restored on tmpfs */
 	mkdir(MPTS_ROOT "/dev/overmount", 0600);
-	fd = open(MPTS_ROOT "/dev/overmount/test.over", O_WRONLY | O_CREAT);
+	fd = open(MPTS_ROOT "/dev/overmount/test.over", O_WRONLY | O_CREAT, 0777);
 	if (fd == -1) {
 		pr_perror("Unable to open " MPTS_ROOT "/dev/overmount");
 		return -1;
@@ -190,14 +190,14 @@ int main(int argc, char **argv)
 	}
 	mkdir(MPTS_ROOT "/dev/slave/test.mnt.slave/test.slave", 0600);
 
-	fd = open(MPTS_ROOT "/dev/bmfile", O_CREAT | O_WRONLY);
+	fd = open(MPTS_ROOT "/dev/bmfile", O_CREAT | O_WRONLY, 0777);
 	if (fd < 0) {
 		pr_perror("Can't create " MPTS_ROOT "/dev/share-1/bmfile");
 		return 1;
 	}
 	close(fd);
 
-	fd = open(MPTS_ROOT "/dev/bmfile-mount", O_CREAT | O_WRONLY);
+	fd = open(MPTS_ROOT "/dev/bmfile-mount", O_CREAT | O_WRONLY, 0777);
 	if (fd < 0) {
 		pr_perror("Can't create " MPTS_ROOT "/dev/share-1/bmfile");
 		return 1;