Btrfs: Handle checksumming errors while reading data blocks

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 9b9db9c..fe6ef8e 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -29,6 +29,7 @@
 	struct btrfs_key location;
 	struct extent_map_tree extent_tree;
 	struct extent_io_tree io_tree;
+	struct extent_io_tree io_failure_tree;
 	struct inode vfs_inode;
 
 	u64 ordered_trans;