diff options
| -rw-r--r-- | fs/btrfs/extent-tree.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 1c2bd1723e40..171312d51799 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2296,9 +2296,22 @@ static int run_one_delayed_ref(struct btrfs_trans_handle *trans, static inline struct btrfs_delayed_ref_node * select_delayed_ref(struct btrfs_delayed_ref_head *head) { + struct btrfs_delayed_ref_node *ref; + if (list_empty(&head->ref_list)) return NULL; + /* + * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first. + * This is to prevent a ref count from going down to zero, which deletes + * the extent item from the extent tree, when there still are references + * to add, which would fail because they would not find the extent item. + */ + list_for_each_entry(ref, &head->ref_list, list) { + if (ref->action == BTRFS_ADD_DELAYED_REF) + return ref; + } + return list_entry(head->ref_list.next, struct btrfs_delayed_ref_node, list); } |