struct interval_node *interval_insert(struct interval_node *node,
struct interval_node **root)
{
struct interval_node **p, *parent = NULL;
LASSERT(!interval_is_intree(node));
p = root;
while (*p) {
parent = *p;
if (extent_equal(&parent->in_extent, &node->in_extent))
return parent;
/* max_high field must be updated after each iteration */
if (parent->in_max_high < interval_high(node))
parent->in_max_high = interval_high(node);
if (extent_compare(&node->in_extent, &parent->in_extent) < 0)
p = &parent->in_left;
else
p = &parent->in_right;
}
/* link node into the tree */
node->in_parent = parent;
node->in_color = INTERVAL_RED;
node->in_left = NULL;
node->in_right = NULL;
*p = node;
interval_insert_color(node, root);
node->in_intree = 1;
return NULL;
}
static inline int node_compare(struct interval_node *n1,
struct interval_node *n2)
{
return extent_compare(&n1->in_extent, &n2->in_extent);
}
