[xfstests PATCH] generic/556: add test case for top-level dir rename

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Test renaming a casefolded directory located in the top-level directory,
while the cache is cold.  When $MOUNT_OPTIONS contains
test_dummy_encryption, this detects an f2fs bug.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 tests/generic/556 | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/generic/556 b/tests/generic/556
index 7ef2f6f4..8abb65e8 100755
--- a/tests/generic/556
+++ b/tests/generic/556
@@ -348,6 +348,21 @@ test_file_rename()
 		echo "Name shouldn't change."
 }
 
+test_toplevel_dir_rename()
+{
+	local dir=${SCRATCH_MNT}/dir_rename
+
+	# With the cache cold, rename a casefolded directory located in the
+	# top-level directory.  If $MOUNT_OPTIONS contains
+	# test_dummy_encryption, this detects the bug that was fixed by
+	# 'f2fs: don't use casefolded comparison for "." and ".."'.
+	mkdir ${dir}
+	_casefold_set_attr ${dir}
+	sync
+	echo 2 > /proc/sys/vm/drop_caches
+	mv ${dir} ${dir}.new
+}
+
 # Test openfd with casefold.
 # 1. Delete a file after gettings its fd.
 # 2. Then create new dir with same name
@@ -486,6 +501,7 @@ test_dir_name_preserve
 test_name_reuse
 test_create_with_same_name
 test_file_rename
+test_toplevel_dir_rename
 test_casefold_openfd
 test_casefold_openfd2
 test_hard_link_lookups

base-commit: bb04d577435d04ce3aa160f0563d1d35d4860d54
-- 
2.36.1