2 * mm/interval_tree.c - interval tree for mapping->i_mmap
4 * Copyright (C) 2012, Michel Lespinasse <walken@google.com>
6 * This file is released under the GPL v2.
11 #include <linux/rmap.h>
12 #include <linux/interval_tree_generic.h>
14 static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
19 static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
21 return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
24 INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.linear.rb,
25 unsigned long, shared.linear.rb_subtree_last,
26 vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
28 /* Insert node immediately after prev in the interval tree */
29 void vma_interval_tree_insert_after(struct vm_area_struct *node,
30 struct vm_area_struct *prev,
33 struct rb_node **link;
34 struct vm_area_struct *parent;
35 unsigned long last = vma_last_pgoff(node);
37 VM_BUG_ON(vma_start_pgoff(node) != vma_start_pgoff(prev));
39 if (!prev->shared.linear.rb.rb_right) {
41 link = &prev->shared.linear.rb.rb_right;
43 parent = rb_entry(prev->shared.linear.rb.rb_right,
44 struct vm_area_struct, shared.linear.rb);
45 if (parent->shared.linear.rb_subtree_last < last)
46 parent->shared.linear.rb_subtree_last = last;
47 while (parent->shared.linear.rb.rb_left) {
48 parent = rb_entry(parent->shared.linear.rb.rb_left,
49 struct vm_area_struct, shared.linear.rb);
50 if (parent->shared.linear.rb_subtree_last < last)
51 parent->shared.linear.rb_subtree_last = last;
53 link = &parent->shared.linear.rb.rb_left;
56 node->shared.linear.rb_subtree_last = last;
57 rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
58 rb_insert_augmented(&node->shared.linear.rb, root,
59 &vma_interval_tree_augment);
62 static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
64 return vma_start_pgoff(avc->vma);
67 static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
69 return vma_last_pgoff(avc->vma);
72 INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
73 avc_start_pgoff, avc_last_pgoff,, anon_vma_interval_tree)