Btrfs: fix oops after block group lookup

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5ab25a0cb16a..4e136b7b03ae 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -998,6 +998,9 @@ static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
         btrfs_item_offset((leaf)->items + (slot))))
 
 /* extent-tree.c */
+struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
+                                                         btrfs_fs_info *info,
+                                                         u64 blocknr);
 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
                                                  struct btrfs_block_group_cache
                                                  *hint, u64 search_start,