-/*
- * entries in the rb tree are ordered by the byte number of the extent,
- * type of the delayed backrefs and content of delayed backrefs.
- */
-static int comp_entry(struct btrfs_delayed_ref_node *ref2,
- struct btrfs_delayed_ref_node *ref1,
- bool compare_seq)
-{
- if (ref1->bytenr < ref2->bytenr)
- return -1;
- if (ref1->bytenr > ref2->bytenr)
- return 1;
- if (ref1->is_head && ref2->is_head)
- return 0;
- if (ref2->is_head)
- return -1;
- if (ref1->is_head)
- return 1;
- if (ref1->type < ref2->type)
- return -1;
- if (ref1->type > ref2->type)
- return 1;
- if (ref1->no_quota > ref2->no_quota)
- return 1;
- if (ref1->no_quota < ref2->no_quota)
- return -1;
- /* merging of sequenced refs is not allowed */
- if (compare_seq) {
- if (ref1->seq < ref2->seq)
- return -1;
- if (ref1->seq > ref2->seq)
- return 1;
- }
- if (ref1->type == BTRFS_TREE_BLOCK_REF_KEY ||
- ref1->type == BTRFS_SHARED_BLOCK_REF_KEY) {
- return comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref2),
- btrfs_delayed_node_to_tree_ref(ref1),
- ref1->type);
- } else if (ref1->type == BTRFS_EXTENT_DATA_REF_KEY ||
- ref1->type == BTRFS_SHARED_DATA_REF_KEY) {
- return comp_data_refs(btrfs_delayed_node_to_data_ref(ref2),
- btrfs_delayed_node_to_data_ref(ref1));
- }
- BUG();
- return 0;
-}
-
-/*
- * insert a new ref into the rbtree. This returns any existing refs
- * for the same (bytenr,parent) tuple, or NULL if the new node was properly
- * inserted.
- */
-static struct btrfs_delayed_ref_node *tree_insert(struct rb_root *root,
- struct rb_node *node)
-{
- struct rb_node **p = &root->rb_node;
- struct rb_node *parent_node = NULL;
- struct btrfs_delayed_ref_node *entry;
- struct btrfs_delayed_ref_node *ins;
- int cmp;
-
- ins = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
- while (*p) {
- parent_node = *p;
- entry = rb_entry(parent_node, struct btrfs_delayed_ref_node,
- rb_node);
-
- cmp = comp_entry(entry, ins, 1);
- if (cmp < 0)
- p = &(*p)->rb_left;
- else if (cmp > 0)
- p = &(*p)->rb_right;
- else
- return entry;
- }
-
- rb_link_node(node, parent_node, p);
- rb_insert_color(node, root);
- return NULL;
-}
-