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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 *) ((void *)p - ((void *)&(((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 */