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-rw-r--r--fs/btrfs/backref.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 3b355be95171..b38a680e6678 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -3063,3 +3063,57 @@ int btrfs_backref_finish_upper_links(struct btrfs_backref_cache *cache,
}
return 0;
}
+
+void btrfs_backref_error_cleanup(struct btrfs_backref_cache *cache,
+ struct btrfs_backref_node *node)
+{
+ struct btrfs_backref_node *lower;
+ struct btrfs_backref_node *upper;
+ struct btrfs_backref_edge *edge;
+
+ while (!list_empty(&cache->useless_node)) {
+ lower = list_first_entry(&cache->useless_node,
+ struct btrfs_backref_node, list);
+ list_del_init(&lower->list);
+ }
+ while (!list_empty(&cache->pending_edge)) {
+ edge = list_first_entry(&cache->pending_edge,
+ struct btrfs_backref_edge, list[UPPER]);
+ list_del(&edge->list[UPPER]);
+ list_del(&edge->list[LOWER]);
+ lower = edge->node[LOWER];
+ upper = edge->node[UPPER];
+ btrfs_backref_free_edge(cache, edge);
+
+ /*
+ * Lower is no longer linked to any upper backref nodes and
+ * isn't in the cache, we can free it ourselves.
+ */
+ if (list_empty(&lower->upper) &&
+ RB_EMPTY_NODE(&lower->rb_node))
+ list_add(&lower->list, &cache->useless_node);
+
+ if (!RB_EMPTY_NODE(&upper->rb_node))
+ continue;
+
+ /* Add this guy's upper edges to the list to process */
+ list_for_each_entry(edge, &upper->upper, list[LOWER])
+ list_add_tail(&edge->list[UPPER],
+ &cache->pending_edge);
+ if (list_empty(&upper->upper))
+ list_add(&upper->list, &cache->useless_node);
+ }
+
+ while (!list_empty(&cache->useless_node)) {
+ lower = list_first_entry(&cache->useless_node,
+ struct btrfs_backref_node, list);
+ list_del_init(&lower->list);
+ if (lower == node)
+ node = NULL;
+ btrfs_backref_free_node(cache, lower);
+ }
+
+ btrfs_backref_cleanup_node(cache, node);
+ ASSERT(list_empty(&cache->useless_node) &&
+ list_empty(&cache->pending_edge));
+}