Btrfs: Clone file data ioctl

Add a new ioctl to clone file data

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 73b92dd..3b6f852 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1516,9 +1516,9 @@
 /* file-item.c */
 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 			       struct btrfs_root *root,
-			       u64 objectid, u64 pos, u64 offset,
+			       u64 objectid, u64 pos, u64 disk_offset,
 			       u64 disk_num_bytes,
-			       u64 num_bytes);
+			     u64 num_bytes, u64 offset);
 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root,
 			     struct btrfs_path *path, u64 objectid,