1 files changed, 8 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ab36769c356c..280ac1aa9b6d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1151,6 +1151,14 @@ int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                 }
 
                 ret = btrfs_add_leaf_ref(root, ref, shared);
+                if (ret == -EEXIST && shared) {
+                        struct btrfs_leaf_ref *old;
+                        old = btrfs_lookup_leaf_ref(root, ref->bytenr);
+                        BUG_ON(!old);
+                        btrfs_remove_leaf_ref(root, old);
+                        btrfs_free_leaf_ref(root, old);
+                        ret = btrfs_add_leaf_ref(root, ref, shared);
+                }
                 WARN_ON(ret);
                 btrfs_free_leaf_ref(root, ref);
         }