Root/mm/interval_tree.c

1/*
2 * mm/interval_tree.c - interval tree for mapping->i_mmap
3 *
4 * Copyright (C) 2012, Michel Lespinasse <walken@google.com>
5 *
6 * This file is released under the GPL v2.
7 */
8
9#include <linux/mm.h>
10#include <linux/fs.h>
11#include <linux/rmap.h>
12#include <linux/interval_tree_generic.h>
13
14static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
15{
16    return v->vm_pgoff;
17}
18
19static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
20{
21    return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
22}
23
24INTERVAL_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)
27
28/* Insert node immediately after prev in the interval tree */
29void vma_interval_tree_insert_after(struct vm_area_struct *node,
30                    struct vm_area_struct *prev,
31                    struct rb_root *root)
32{
33    struct rb_node **link;
34    struct vm_area_struct *parent;
35    unsigned long last = vma_last_pgoff(node);
36
37    VM_BUG_ON(vma_start_pgoff(node) != vma_start_pgoff(prev));
38
39    if (!prev->shared.linear.rb.rb_right) {
40        parent = prev;
41        link = &prev->shared.linear.rb.rb_right;
42    } else {
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;
52        }
53        link = &parent->shared.linear.rb.rb_left;
54    }
55
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);
60}
61
62static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
63{
64    return vma_start_pgoff(avc->vma);
65}
66
67static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
68{
69    return vma_last_pgoff(avc->vma);
70}
71
72INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
73             avc_start_pgoff, avc_last_pgoff,
74             static inline, __anon_vma_interval_tree)
75
76void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
77                   struct rb_root *root)
78{
79#ifdef CONFIG_DEBUG_VM_RB
80    node->cached_vma_start = avc_start_pgoff(node);
81    node->cached_vma_last = avc_last_pgoff(node);
82#endif
83    __anon_vma_interval_tree_insert(node, root);
84}
85
86void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
87                   struct rb_root *root)
88{
89    __anon_vma_interval_tree_remove(node, root);
90}
91
92struct anon_vma_chain *
93anon_vma_interval_tree_iter_first(struct rb_root *root,
94                  unsigned long first, unsigned long last)
95{
96    return __anon_vma_interval_tree_iter_first(root, first, last);
97}
98
99struct anon_vma_chain *
100anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
101                 unsigned long first, unsigned long last)
102{
103    return __anon_vma_interval_tree_iter_next(node, first, last);
104}
105
106#ifdef CONFIG_DEBUG_VM_RB
107void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
108{
109    WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
110    WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
111}
112#endif
113

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