/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _LINUX_INTERVAL_TREE_H
  #define _LINUX_INTERVAL_TREE_H
  
  #include <linux/rbtree.h>
  
  struct interval_tree_node {
  	struct rb_node rb;
  	unsigned long start;	/* Start of interval */
  	unsigned long last;	/* Last location _in_ interval */
  	unsigned long __subtree_last;
  };
  
  extern void

  interval_tree_insert(struct interval_tree_node *node,
  		     struct rb_root_cached *root);

  
  extern void

  interval_tree_remove(struct interval_tree_node *node,
  		     struct rb_root_cached *root);

  
  extern struct interval_tree_node *

  interval_tree_iter_first(struct rb_root_cached *root,

  			 unsigned long start, unsigned long last);
  
  extern struct interval_tree_node *
  interval_tree_iter_next(struct interval_tree_node *node,
  			unsigned long start, unsigned long last);
  
  #endif	/* _LINUX_INTERVAL_TREE_H */