1 files changed, 12 insertions, 4 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 208d8aa5b07e..04edf69be875 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -461,6 +461,7 @@ static int __merge_refs(struct list_head *head, int mode)
                      pos2 = n2, n2 = pos2->next) {
                         struct __prelim_ref *ref2;
                         struct __prelim_ref *xchg;
+                        struct extent_inode_elem *eie;
 
                         ref2 = list_entry(pos2, struct __prelim_ref, list);
 
@@ -472,12 +473,20 @@ static int __merge_refs(struct list_head *head, int mode)
                                         ref1 = ref2;
                                         ref2 = xchg;
                                 }
-                                ref1->count += ref2->count;
                         } else {
                                 if (ref1->parent != ref2->parent)
                                         continue;
-                                ref1->count += ref2->count;
                         }
+
+                        eie = ref1->inode_list;
+                        while (eie && eie->next)
+                                eie = eie->next;
+                        if (eie)
+                                eie->next = ref2->inode_list;
+                        else
+                                ref1->inode_list = ref2->inode_list;
+                        ref1->count += ref2->count;
+
                         list_del(&ref2->list);
                         kfree(ref2);
                 }
@@ -890,8 +899,7 @@ again:
         while (!list_empty(&prefs)) {
                 ref = list_first_entry(&prefs, struct __prelim_ref, list);
                 list_del(&ref->list);
-                if (ref->count < 0)
-                        WARN_ON(1);
+                WARN_ON(ref->count < 0);
                 if (ref->count && ref->root_id && ref->parent == 0) {
                         /* no parent == root of tree */
                         ret = ulist_add(roots, ref->root_id, 0, GFP_NOFS);