HFS+: add custom dentry hash and comparison operations

Add custom dentry hash and comparison operations for HFS+ filesystems that are
case-insensitive and/or do automatic unicode decomposition.  The new
operations reuse the existing HFS+ ASCII to unicode conversion, unicode
decomposition and case folding functionality.

Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
index 90ebab7..050d29c 100644
--- a/fs/hfsplus/btree.c
+++ b/fs/hfsplus/btree.c
@@ -62,8 +62,10 @@
 		if ((HFSPLUS_SB(sb).flags & HFSPLUS_SB_HFSX) &&
 		    (head->key_type == HFSPLUS_KEY_BINARY))
 			tree->keycmp = hfsplus_cat_bin_cmp_key;
-		else
+		else {
 			tree->keycmp = hfsplus_cat_case_cmp_key;
+			HFSPLUS_SB(sb).flags |= HFSPLUS_SB_CASEFOLD;
+		}
 	} else {
 		printk(KERN_ERR "hfs: unknown B*Tree requested\n");
 		goto fail_page;