diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c
new file mode 100644
index 0000000..cf68fcf
--- /dev/null
+++ b/fs/btrfs/struct-funcs.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2007 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/highmem.h>
+#define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
+u##bits btrfs_##name(struct extent_buffer *eb,				\
+				   type *s)				\
+{									\
+	unsigned long offset = (unsigned long)s +			\
+				offsetof(type, member);			\
+	__le##bits *tmp;						\
+	/* ugly, but we want the fast path here */			\
+	if (eb->map_token && offset >= eb->map_start &&			\
+	    offset + sizeof(((type *)0)->member) <= eb->map_start +	\
+	    eb->map_len) {						\
+		tmp = (__le##bits *)(eb->kaddr + offset -		\
+				     eb->map_start);			\
+		return le##bits##_to_cpu(*tmp);				\
+	}								\
+	{								\
+		int err;						\
+		char *map_token;					\
+		char *kaddr;						\
+		int unmap_on_exit = (eb->map_token == NULL);		\
+		unsigned long map_start;				\
+		unsigned long map_len;					\
+		__le##bits res;						\
+		err = map_extent_buffer(eb, offset,			\
+			        sizeof(((type *)0)->member),		\
+				&map_token, &kaddr,			\
+				&map_start, &map_len, KM_USER1);	\
+		if (err) {						\
+			read_eb_member(eb, s, type, member, &res);	\
+			return le##bits##_to_cpu(res);			\
+		}							\
+		tmp = (__le##bits *)(kaddr + offset - map_start);	\
+		res = le##bits##_to_cpu(*tmp);				\
+		if (unmap_on_exit)					\
+			unmap_extent_buffer(eb, map_token, KM_USER1);	\
+		return res;						\
+	}								\
+}									\
+void btrfs_set_##name(struct extent_buffer *eb,				\
+				    type *s, u##bits val)		\
+{									\
+	unsigned long offset = (unsigned long)s +			\
+				offsetof(type, member);			\
+	__le##bits *tmp;						\
+	/* ugly, but we want the fast path here */			\
+	if (eb->map_token && offset >= eb->map_start &&			\
+	    offset + sizeof(((type *)0)->member) <= eb->map_start +	\
+	    eb->map_len) {						\
+		tmp = (__le##bits *)(eb->kaddr + offset -		\
+				     eb->map_start);			\
+		*tmp = cpu_to_le##bits(val);				\
+		return;							\
+	}								\
+	{								\
+		int err;						\
+		char *map_token;					\
+		char *kaddr;						\
+		int unmap_on_exit = (eb->map_token == NULL);		\
+		unsigned long map_start;				\
+		unsigned long map_len;					\
+		err = map_extent_buffer(eb, offset,			\
+			        sizeof(((type *)0)->member),		\
+				&map_token, &kaddr,			\
+				&map_start, &map_len, KM_USER1);	\
+		if (err) {						\
+			val = cpu_to_le##bits(val);			\
+			write_eb_member(eb, s, type, member, &val);	\
+			return;						\
+		}							\
+		tmp = (__le##bits *)(kaddr + offset - map_start);	\
+		*tmp = cpu_to_le##bits(val);				\
+		if (unmap_on_exit)					\
+			unmap_extent_buffer(eb, map_token, KM_USER1);	\
+	}								\
+}
+
+#include "ctree.h"
+