[PATCH 3/4] fstests: add helper _require_exportfs

[Amir Goldstein <amir73il@gmail.com>]

Use open_by_handle -c to determine if filesystem supports NFS export
---
 common/rc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/common/rc b/common/rc
index 685b859..f24a21f 100644
--- a/common/rc
+++ b/common/rc
@@ -2857,6 +2857,15 @@ _require_freeze()
 	[ $result -eq 0 ] || _notrun "$FSTYP does not support freezing"
 }
 
+# Does NFS export work on this fs?
+_require_exportfs()
+{
+	mkdir -p "$TEST_DIR"/export_test
+	$here/src/open_by_handle -c "$TEST_DIR"/export_test 2>&1 \
+		|| _notrun "$FSTYP does not support NFS export"
+}
+
+
 # Does shutdown work on this fs?
 _require_scratch_shutdown()
 {
-- 
2.7.4