zdtm: Add test for opened ghost directory

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -78,6 +78,7 @@ static/unlink_fstat03
 static/unlink_mmap00
 static/unlink_mmap01
 static/unlink_mmap02
+static/rmdir_open
 static/eventfs00
 static/signalfd00
 static/inotify00

test/zdtm/.gitignore

@@ -143,6 +143,7 @@
 /live/static/unlink_mmap00
 /live/static/unlink_mmap01
 /live/static/unlink_mmap02
+/live/static/rmdir_open
 /live/static/uptime_grow
 /live/static/utsname
 /live/static/vdso00

test/zdtm/live/static/Makefile

@@ -160,6 +160,7 @@ TST_DIR		=				\
 		tempfs				\
 		bind-mount			\
 		cgroup00			\
+		rmdir_open			\
 
 TST_DIR_FILE	=				\
 		chroot				\

test/zdtm/live/static/rmdir_open.c

+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that opened removed dir works";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "directory name", 1);
+
+int main(int argc, char **argv)
+{
+	int fd;
+	struct stat st;
+
+	test_init(argc, argv);
+
+	if (mkdir(dirname, 0700)) {
+		err("Can't make dir\n");
+		goto out;
+	}
+
+	fd = open(dirname, O_DIRECTORY);
+	if (fd < 0) {
+		err("Can't open dir\n");
+		goto outr;
+	}
+
+	if (rmdir(dirname)) {
+		err("Can't remove dir\n");
+		goto outr;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	/*
+	 * We can't compare anything with previous, since
+	 * inode _will_ change, so can the device. The only
+	 * reasonable thing we can do is check that the fd
+	 * still points to some removed directory.
+	 */
+	if (fstat(fd, &st)) {
+		fail("Can't stat fd\n");
+		goto out;
+	}
+
+	if (!S_ISDIR(st.st_mode)) {
+		fail("Fd is no longer directory\n");
+		goto out;
+	}
+
+	if (st.st_nlink != 0) {
+		fail("Directory is not removed\n");
+		goto out;
+	}
+
+	pass();
+	return 0;
+
+outr:
+	rmdir(dirname);
+out:
+	return 1;
+}