diff --git a/check/main.c b/check/main.c
index 7fc30da83ea1..c91a949ff7cc 100644
--- a/check/main.c
+++ b/check/main.c
@@ -43,6 +43,7 @@
 #include "kernel-shared/ulist.h"
 #include "hash.h"
 #include "help.h"
+#include "check/original.h"
 
 enum task_position {
 	TASK_EXTENTS,
@@ -84,35 +85,6 @@ enum btrfs_check_mode {
 
 static enum btrfs_check_mode check_mode = CHECK_MODE_DEFAULT;
 
-struct extent_backref {
-	struct rb_node node;
-	unsigned int is_data:1;
-	unsigned int found_extent_tree:1;
-	unsigned int full_backref:1;
-	unsigned int found_ref:1;
-	unsigned int broken:1;
-};
-
-static inline struct extent_backref* rb_node_to_extent_backref(struct rb_node *node)
-{
-	return rb_entry(node, struct extent_backref, node);
-}
-
-struct data_backref {
-	struct extent_backref node;
-	union {
-		u64 parent;
-		u64 root;
-	};
-	u64 owner;
-	u64 offset;
-	u64 disk_bytenr;
-	u64 bytes;
-	u64 ram_bytes;
-	u32 num_refs;
-	u32 found_ref;
-};
-
 #define ROOT_DIR_ERROR		(1<<1)	/* bad ROOT_DIR */
 #define DIR_ITEM_MISSING	(1<<2)	/* DIR_ITEM not found */
 #define DIR_ITEM_MISMATCH	(1<<3)	/* DIR_ITEM found but not match */
@@ -135,11 +107,6 @@ struct data_backref {
 #define DIR_COUNT_AGAIN         (1<<20) /* DIR isize should be recalculated */
 #define BG_ACCOUNTING_ERROR     (1<<21) /* Block group accounting error */
 
-static inline struct data_backref* to_data_backref(struct extent_backref *back)
-{
-	return container_of(back, struct data_backref, node);
-}
-
 static int compare_data_backref(struct rb_node *node1, struct rb_node *node2)
 {
 	struct extent_backref *ext1 = rb_node_to_extent_backref(node1);
@@ -185,34 +152,6 @@ static int compare_data_backref(struct rb_node *node1, struct rb_node *node2)
 	return 0;
 }
 
-/*
- * Much like data_backref, just removed the undetermined members
- * and change it to use list_head.
- * During extent scan, it is stored in root->orphan_data_extent.
- * During fs tree scan, it is then moved to inode_rec->orphan_data_extents.
- */
-struct orphan_data_extent {
-	struct list_head list;
-	u64 root;
-	u64 objectid;
-	u64 offset;
-	u64 disk_bytenr;
-	u64 disk_len;
-};
-
-struct tree_backref {
-	struct extent_backref node;
-	union {
-		u64 parent;
-		u64 root;
-	};
-};
-
-static inline struct tree_backref* to_tree_backref(struct extent_backref *back)
-{
-	return container_of(back, struct tree_backref, node);
-}
-
 static int compare_tree_backref(struct rb_node *node1, struct rb_node *node2)
 {
 	struct extent_backref *ext1 = rb_node_to_extent_backref(node1);
@@ -254,212 +193,6 @@ static int compare_extent_backref(struct rb_node *node1, struct rb_node *node2)
 		return compare_tree_backref(node1, node2);
 }
 
-/* Explicit initialization for extent_record::flag_block_full_backref */
-enum { FLAG_UNSET = 2 };
-
-struct extent_record {
-	struct list_head backrefs;
-	struct list_head dups;
-	struct rb_root backref_tree;
-	struct list_head list;
-	struct cache_extent cache;
-	struct btrfs_disk_key parent_key;
-	u64 start;
-	u64 max_size;
-	u64 nr;
-	u64 refs;
-	u64 extent_item_refs;
-	u64 generation;
-	u64 parent_generation;
-	u64 info_objectid;
-	u32 num_duplicates;
-	u8 info_level;
-	unsigned int flag_block_full_backref:2;
-	unsigned int found_rec:1;
-	unsigned int content_checked:1;
-	unsigned int owner_ref_checked:1;
-	unsigned int is_root:1;
-	unsigned int metadata:1;
-	unsigned int bad_full_backref:1;
-	unsigned int crossing_stripes:1;
-	unsigned int wrong_chunk_type:1;
-};
-
-static inline struct extent_record* to_extent_record(struct list_head *entry)
-{
-	return container_of(entry, struct extent_record, list);
-}
-
-struct inode_backref {
-	struct list_head list;
-	unsigned int found_dir_item:1;
-	unsigned int found_dir_index:1;
-	unsigned int found_inode_ref:1;
-	u8 filetype;
-	u8 ref_type;
-	int errors;
-	u64 dir;
-	u64 index;
-	u16 namelen;
-	char name[0];
-};
-
-static inline struct inode_backref* to_inode_backref(struct list_head *entry)
-{
-	return list_entry(entry, struct inode_backref, list);
-}
-
-struct root_item_record {
-	struct list_head list;
-	u64 objectid;
-	u64 bytenr;
-	u64 last_snapshot;
-	u8 level;
-	u8 drop_level;
-	struct btrfs_key drop_key;
-};
-
-#define REF_ERR_NO_DIR_ITEM		(1 << 0)
-#define REF_ERR_NO_DIR_INDEX		(1 << 1)
-#define REF_ERR_NO_INODE_REF		(1 << 2)
-#define REF_ERR_DUP_DIR_ITEM		(1 << 3)
-#define REF_ERR_DUP_DIR_INDEX		(1 << 4)
-#define REF_ERR_DUP_INODE_REF		(1 << 5)
-#define REF_ERR_INDEX_UNMATCH		(1 << 6)
-#define REF_ERR_FILETYPE_UNMATCH	(1 << 7)
-#define REF_ERR_NAME_TOO_LONG		(1 << 8) // 100
-#define REF_ERR_NO_ROOT_REF		(1 << 9)
-#define REF_ERR_NO_ROOT_BACKREF		(1 << 10)
-#define REF_ERR_DUP_ROOT_REF		(1 << 11)
-#define REF_ERR_DUP_ROOT_BACKREF	(1 << 12)
-
-struct file_extent_hole {
-	struct rb_node node;
-	u64 start;
-	u64 len;
-};
-
-struct inode_record {
-	struct list_head backrefs;
-	unsigned int checked:1;
-	unsigned int merging:1;
-	unsigned int found_inode_item:1;
-	unsigned int found_dir_item:1;
-	unsigned int found_file_extent:1;
-	unsigned int found_csum_item:1;
-	unsigned int some_csum_missing:1;
-	unsigned int nodatasum:1;
-	int errors;
-
-	u64 ino;
-	u32 nlink;
-	u32 imode;
-	u64 isize;
-	u64 nbytes;
-
-	u32 found_link;
-	u64 found_size;
-	u64 extent_start;
-	u64 extent_end;
-	struct rb_root holes;
-	struct list_head orphan_extents;
-
-	u32 refs;
-};
-
-#define I_ERR_NO_INODE_ITEM		(1 << 0)
-#define I_ERR_NO_ORPHAN_ITEM		(1 << 1)
-#define I_ERR_DUP_INODE_ITEM		(1 << 2)
-#define I_ERR_DUP_DIR_INDEX		(1 << 3)
-#define I_ERR_ODD_DIR_ITEM		(1 << 4)
-#define I_ERR_ODD_FILE_EXTENT		(1 << 5)
-#define I_ERR_BAD_FILE_EXTENT		(1 << 6)
-#define I_ERR_FILE_EXTENT_OVERLAP	(1 << 7)
-#define I_ERR_FILE_EXTENT_DISCOUNT	(1 << 8) // 100
-#define I_ERR_DIR_ISIZE_WRONG		(1 << 9)
-#define I_ERR_FILE_NBYTES_WRONG		(1 << 10) // 400
-#define I_ERR_ODD_CSUM_ITEM		(1 << 11)
-#define I_ERR_SOME_CSUM_MISSING		(1 << 12)
-#define I_ERR_LINK_COUNT_WRONG		(1 << 13)
-#define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
-
-struct root_backref {
-	struct list_head list;
-	unsigned int found_dir_item:1;
-	unsigned int found_dir_index:1;
-	unsigned int found_back_ref:1;
-	unsigned int found_forward_ref:1;
-	unsigned int reachable:1;
-	int errors;
-	u64 ref_root;
-	u64 dir;
-	u64 index;
-	u16 namelen;
-	char name[0];
-};
-
-static inline struct root_backref* to_root_backref(struct list_head *entry)
-{
-	return list_entry(entry, struct root_backref, list);
-}
-
-struct root_record {
-	struct list_head backrefs;
-	struct cache_extent cache;
-	unsigned int found_root_item:1;
-	u64 objectid;
-	u32 found_ref;
-};
-
-struct ptr_node {
-	struct cache_extent cache;
-	void *data;
-};
-
-struct shared_node {
-	struct cache_extent cache;
-	struct cache_tree root_cache;
-	struct cache_tree inode_cache;
-	struct inode_record *current;
-	u32 refs;
-};
-
-struct block_info {
-	u64 start;
-	u32 size;
-};
-
-struct walk_control {
-	struct cache_tree shared;
-	struct shared_node *nodes[BTRFS_MAX_LEVEL];
-	int active_node;
-	int root_level;
-};
-
-struct bad_item {
-	struct btrfs_key key;
-	u64 root_id;
-	struct list_head list;
-};
-
-struct extent_entry {
-	u64 bytenr;
-	u64 bytes;
-	int count;
-	int broken;
-	struct list_head list;
-};
-
-struct root_item_info {
-	/* level of the root */
-	u8 level;
-	/* number of nodes at this level, must be 1 for a root */
-	int node_count;
-	u64 bytenr;
-	u64 gen;
-	struct cache_extent cache_extent;
-};
-
 /*
  * Error bit for low memory mode check.
  *
diff --git a/check/original.h b/check/original.h
new file mode 100644
index 000000000000..0d9ab353413b
--- /dev/null
+++ b/check/original.h
@@ -0,0 +1,293 @@
+/*
+ * 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.
+ */
+
+/*
+ * Defines and function declarations for original mode check.
+ */
+
+#ifndef __BTRFS_CHECK_ORIGINAL_H__
+#define __BTRFS_CHECK_ORIGINAL_H__
+#include "rbtree-utils.h"
+
+struct extent_backref {
+	struct rb_node node;
+	unsigned int is_data:1;
+	unsigned int found_extent_tree:1;
+	unsigned int full_backref:1;
+	unsigned int found_ref:1;
+	unsigned int broken:1;
+};
+
+static inline struct extent_backref* rb_node_to_extent_backref(struct rb_node *node)
+{
+	return rb_entry(node, struct extent_backref, node);
+}
+
+struct data_backref {
+	struct extent_backref node;
+	union {
+		u64 parent;
+		u64 root;
+	};
+	u64 owner;
+	u64 offset;
+	u64 disk_bytenr;
+	u64 bytes;
+	u64 ram_bytes;
+	u32 num_refs;
+	u32 found_ref;
+};
+
+static inline struct data_backref* to_data_backref(struct extent_backref *back)
+{
+	return container_of(back, struct data_backref, node);
+}
+
+/*
+ * Much like data_backref, just removed the undetermined members
+ * and change it to use list_head.
+ * During extent scan, it is stored in root->orphan_data_extent.
+ * During fs tree scan, it is then moved to inode_rec->orphan_data_extents.
+ */
+struct orphan_data_extent {
+	struct list_head list;
+	u64 root;
+	u64 objectid;
+	u64 offset;
+	u64 disk_bytenr;
+	u64 disk_len;
+};
+
+struct tree_backref {
+	struct extent_backref node;
+	union {
+		u64 parent;
+		u64 root;
+	};
+};
+
+static inline struct tree_backref* to_tree_backref(struct extent_backref *back)
+{
+	return container_of(back, struct tree_backref, node);
+}
+
+/* Explicit initialization for extent_record::flag_block_full_backref */
+enum { FLAG_UNSET = 2 };
+
+struct extent_record {
+	struct list_head backrefs;
+	struct list_head dups;
+	struct rb_root backref_tree;
+	struct list_head list;
+	struct cache_extent cache;
+	struct btrfs_disk_key parent_key;
+	u64 start;
+	u64 max_size;
+	u64 nr;
+	u64 refs;
+	u64 extent_item_refs;
+	u64 generation;
+	u64 parent_generation;
+	u64 info_objectid;
+	u32 num_duplicates;
+	u8 info_level;
+	unsigned int flag_block_full_backref:2;
+	unsigned int found_rec:1;
+	unsigned int content_checked:1;
+	unsigned int owner_ref_checked:1;
+	unsigned int is_root:1;
+	unsigned int metadata:1;
+	unsigned int bad_full_backref:1;
+	unsigned int crossing_stripes:1;
+	unsigned int wrong_chunk_type:1;
+};
+
+static inline struct extent_record* to_extent_record(struct list_head *entry)
+{
+	return container_of(entry, struct extent_record, list);
+}
+
+struct inode_backref {
+	struct list_head list;
+	unsigned int found_dir_item:1;
+	unsigned int found_dir_index:1;
+	unsigned int found_inode_ref:1;
+	u8 filetype;
+	u8 ref_type;
+	int errors;
+	u64 dir;
+	u64 index;
+	u16 namelen;
+	char name[0];
+};
+
+static inline struct inode_backref* to_inode_backref(struct list_head *entry)
+{
+	return list_entry(entry, struct inode_backref, list);
+}
+
+struct root_item_record {
+	struct list_head list;
+	u64 objectid;
+	u64 bytenr;
+	u64 last_snapshot;
+	u8 level;
+	u8 drop_level;
+	struct btrfs_key drop_key;
+};
+
+#define REF_ERR_NO_DIR_ITEM		(1 << 0)
+#define REF_ERR_NO_DIR_INDEX		(1 << 1)
+#define REF_ERR_NO_INODE_REF		(1 << 2)
+#define REF_ERR_DUP_DIR_ITEM		(1 << 3)
+#define REF_ERR_DUP_DIR_INDEX		(1 << 4)
+#define REF_ERR_DUP_INODE_REF		(1 << 5)
+#define REF_ERR_INDEX_UNMATCH		(1 << 6)
+#define REF_ERR_FILETYPE_UNMATCH	(1 << 7)
+#define REF_ERR_NAME_TOO_LONG		(1 << 8) // 100
+#define REF_ERR_NO_ROOT_REF		(1 << 9)
+#define REF_ERR_NO_ROOT_BACKREF		(1 << 10)
+#define REF_ERR_DUP_ROOT_REF		(1 << 11)
+#define REF_ERR_DUP_ROOT_BACKREF	(1 << 12)
+
+struct file_extent_hole {
+	struct rb_node node;
+	u64 start;
+	u64 len;
+};
+
+#define I_ERR_NO_INODE_ITEM		(1 << 0)
+#define I_ERR_NO_ORPHAN_ITEM		(1 << 1)
+#define I_ERR_DUP_INODE_ITEM		(1 << 2)
+#define I_ERR_DUP_DIR_INDEX		(1 << 3)
+#define I_ERR_ODD_DIR_ITEM		(1 << 4)
+#define I_ERR_ODD_FILE_EXTENT		(1 << 5)
+#define I_ERR_BAD_FILE_EXTENT		(1 << 6)
+#define I_ERR_FILE_EXTENT_OVERLAP	(1 << 7)
+#define I_ERR_FILE_EXTENT_DISCOUNT	(1 << 8) // 100
+#define I_ERR_DIR_ISIZE_WRONG		(1 << 9)
+#define I_ERR_FILE_NBYTES_WRONG		(1 << 10) // 400
+#define I_ERR_ODD_CSUM_ITEM		(1 << 11)
+#define I_ERR_SOME_CSUM_MISSING		(1 << 12)
+#define I_ERR_LINK_COUNT_WRONG		(1 << 13)
+#define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
+
+struct inode_record {
+	struct list_head backrefs;
+	unsigned int checked:1;
+	unsigned int merging:1;
+	unsigned int found_inode_item:1;
+	unsigned int found_dir_item:1;
+	unsigned int found_file_extent:1;
+	unsigned int found_csum_item:1;
+	unsigned int some_csum_missing:1;
+	unsigned int nodatasum:1;
+	int errors;
+
+	u64 ino;
+	u32 nlink;
+	u32 imode;
+	u64 isize;
+	u64 nbytes;
+
+	u32 found_link;
+	u64 found_size;
+	u64 extent_start;
+	u64 extent_end;
+	struct rb_root holes;
+	struct list_head orphan_extents;
+
+	u32 refs;
+};
+
+struct root_backref {
+	struct list_head list;
+	unsigned int found_dir_item:1;
+	unsigned int found_dir_index:1;
+	unsigned int found_back_ref:1;
+	unsigned int found_forward_ref:1;
+	unsigned int reachable:1;
+	int errors;
+	u64 ref_root;
+	u64 dir;
+	u64 index;
+	u16 namelen;
+	char name[0];
+};
+
+static inline struct root_backref* to_root_backref(struct list_head *entry)
+{
+	return list_entry(entry, struct root_backref, list);
+}
+
+struct root_record {
+	struct list_head backrefs;
+	struct cache_extent cache;
+	unsigned int found_root_item:1;
+	u64 objectid;
+	u32 found_ref;
+};
+
+struct ptr_node {
+	struct cache_extent cache;
+	void *data;
+};
+
+struct shared_node {
+	struct cache_extent cache;
+	struct cache_tree root_cache;
+	struct cache_tree inode_cache;
+	struct inode_record *current;
+	u32 refs;
+};
+
+struct block_info {
+	u64 start;
+	u32 size;
+};
+
+struct walk_control {
+	struct cache_tree shared;
+	struct shared_node *nodes[BTRFS_MAX_LEVEL];
+	int active_node;
+	int root_level;
+};
+
+struct bad_item {
+	struct btrfs_key key;
+	u64 root_id;
+	struct list_head list;
+};
+
+struct extent_entry {
+	u64 bytenr;
+	u64 bytes;
+	int count;
+	int broken;
+	struct list_head list;
+};
+
+struct root_item_info {
+	/* level of the root */
+	u8 level;
+	/* number of nodes at this level, must be 1 for a root */
+	int node_count;
+	u64 bytenr;
+	u64 gen;
+	struct cache_extent cache_extent;
+};
+
+#endif
