[PATCH v2] UBIFS: add a comment in key.h for unused parameter

[Dongsheng Yang]

Add a comment in key.h to explain why we keep an unused
parameter in key helpers.

Signed-off-by: Dongsheng Yang <yangds.fnst at cn.fujitsu.com>
---
 fs/ubifs/key.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/ubifs/key.h b/fs/ubifs/key.h
index 92a8491..c0a95e3 100644
--- a/fs/ubifs/key.h
+++ b/fs/ubifs/key.h
@@ -34,6 +34,12 @@
  * node. We use "r5" hash borrowed from reiserfs.
  */
 
+/*
+ * Lot's of the key helpers require a struct ubifs_info *c as the first parameter.
+ * But we are not using it at all currently. That's designed for future extensions of
+ * different c->key_format. But right now, there is only one key type, UBIFS_SIMPLE_KEY_FMT.
+ */
+
 #ifndef __UBIFS_KEY_H__
 #define __UBIFS_KEY_H__
 
-- 
1.8.4.2