[PATCH 5/5] overlay/017: test persistent inode numbers after mount cycle

[Amir Goldstein <amir73il@gmail.com>]

Overlayfs directory inodes are constant across copy up,
but not persistent on mount cycle.
Compare the inode numbers before and after mount cycle.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 tests/overlay/017 | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tests/overlay/017 b/tests/overlay/017
index 1cf684d..fe66f4c 100755
--- a/tests/overlay/017
+++ b/tests/overlay/017
@@ -9,7 +9,8 @@
 # - stat file A shows inode number Y != X
 #
 # Also test if d_ino of readdir entries changes after copy up
-# and if inode numbers persist after rename and drop caches.
+# and if inode numbers persist after rename, drop caches and
+# mount cycle.
 #
 #-----------------------------------------------------------------------
 #
@@ -133,6 +134,19 @@ done
 diff -u $tmp.before $tmp.after_copyup
 diff -u $tmp.after_copyup $tmp.after_move
 
+# Verify that the inode numbers survive a mount cycle
+_scratch_cycle_mount
+
+record_inode_numbers $testdir $tmp.after_cycle
+
+cat $tmp.after_move | while read ino f; do
+	find $testdir/ -inum $ino -maxdepth 1 | grep -q $f || \
+		echo "$f not found by ino $ino"
+done
+
+# Compare before..after - expect silence
+diff -u $tmp.after_move $tmp.after_cycle
+
 echo "Silence is golden"
 status=0
 exit
-- 
2.7.4