diff --git a/fs/hfs/sysdep.c b/fs/hfs/sysdep.c
new file mode 100644
index 0000000..5bf89ec
--- /dev/null
+++ b/fs/hfs/sysdep.c
@@ -0,0 +1,40 @@
+/*
+ *  linux/fs/hfs/sysdep.c
+ *
+ * Copyright (C) 1996  Paul H. Hargrove
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ * This file may be distributed under the terms of the GNU General Public License.
+ *
+ * This file contains the code to do various system dependent things.
+ */
+
+#include "hfs_fs.h"
+
+/* dentry case-handling: just lowercase everything */
+
+static int hfs_revalidate_dentry(struct dentry *dentry, struct nameidata *nd)
+{
+	struct inode *inode = dentry->d_inode;
+	int diff;
+
+	if(!inode)
+		return 1;
+
+	/* fix up inode on a timezone change */
+	diff = sys_tz.tz_minuteswest * 60 - HFS_I(inode)->tz_secondswest;
+	if (diff) {
+		inode->i_ctime.tv_sec += diff;
+		inode->i_atime.tv_sec += diff;
+		inode->i_mtime.tv_sec += diff;
+		HFS_I(inode)->tz_secondswest += diff;
+	}
+	return 1;
+}
+
+struct dentry_operations hfs_dentry_operations =
+{
+	.d_revalidate	= hfs_revalidate_dentry,
+	.d_hash		= hfs_hash_dentry,
+	.d_compare	= hfs_compare_dentry,
+};
+