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#ifndef _LINUX_RBTREE_H
#define _LINUX_RBTREE_H
struct rb_node {
struct rb_node *rb_left; /* left element */
struct rb_node *rb_right; /* right element */
struct rb_node *rb_parent; /* parent element */
int rb_color; /* node color */
};
struct rb_root {
struct rb_node *rb_node; /* root of the tree */
};
#define NULL ((void *)0)
#define RB_ROOT ((struct rb_root){NULL})
#define rb_entry(p, container, field) \
((container *) ((char *)p - ((char *)&(((container *)0)->field))))
#define RB_BLACK 0
#define RB_RED 1
extern void rb_insert_color(struct rb_node *, struct rb_root *);
extern void rb_erase(struct rb_node *, struct rb_root *);
/* Find logical next and previous nodes in a tree */
extern struct rb_node *rb_next(struct rb_node *);
extern struct rb_node *rb_prev(struct rb_node *);
extern struct rb_node *rb_first(struct rb_root *);
/* Fast replacement of a single node without remove/rebalance/add/rebalance */
extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
struct rb_root *root);
static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
struct rb_node ** rb_link)
{
node->rb_parent = parent;
node->rb_color = RB_RED;
node->rb_left = node->rb_right = NULL;
*rb_link = node;
}
#endif /* _LINUX_RBTREE_H */
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