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[mirror_ubuntu-jammy-kernel.git] / mm / interval_tree.c
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8092f73c 1// SPDX-License-Identifier: GPL-2.0-only
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2/*
3 * mm/interval_tree.c - interval tree for mapping->i_mmap
4 *
5 * Copyright (C) 2012, Michel Lespinasse <walken@google.com>
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6 */
7
8#include <linux/mm.h>
9#include <linux/fs.h>
bf181b9f 10#include <linux/rmap.h>
9826a516 11#include <linux/interval_tree_generic.h>
6b2dbba8 12
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13static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
14{
15 return v->vm_pgoff;
16}
17
18static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
19{
e025f059 20 return v->vm_pgoff + vma_pages(v) - 1;
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21}
22
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23INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
24 unsigned long, shared.rb_subtree_last,
0c1dcb05 25 vma_start_pgoff, vma_last_pgoff, /* empty */, vma_interval_tree)
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26
27/* Insert node immediately after prev in the interval tree */
28void vma_interval_tree_insert_after(struct vm_area_struct *node,
29 struct vm_area_struct *prev,
f808c13f 30 struct rb_root_cached *root)
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31{
32 struct rb_node **link;
33 struct vm_area_struct *parent;
9826a516 34 unsigned long last = vma_last_pgoff(node);
6b2dbba8 35
81d1b09c 36 VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
6b2dbba8 37
ac51b934 38 if (!prev->shared.rb.rb_right) {
9826a516 39 parent = prev;
ac51b934 40 link = &prev->shared.rb.rb_right;
6b2dbba8 41 } else {
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42 parent = rb_entry(prev->shared.rb.rb_right,
43 struct vm_area_struct, shared.rb);
44 if (parent->shared.rb_subtree_last < last)
45 parent->shared.rb_subtree_last = last;
46 while (parent->shared.rb.rb_left) {
47 parent = rb_entry(parent->shared.rb.rb_left,
48 struct vm_area_struct, shared.rb);
49 if (parent->shared.rb_subtree_last < last)
50 parent->shared.rb_subtree_last = last;
6b2dbba8 51 }
ac51b934 52 link = &parent->shared.rb.rb_left;
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53 }
54
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55 node->shared.rb_subtree_last = last;
56 rb_link_node(&node->shared.rb, &parent->shared.rb, link);
f808c13f 57 rb_insert_augmented(&node->shared.rb, &root->rb_root,
9826a516 58 &vma_interval_tree_augment);
6b2dbba8 59}
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60
61static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
62{
63 return vma_start_pgoff(avc->vma);
64}
65
66static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
67{
68 return vma_last_pgoff(avc->vma);
69}
70
71INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
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72 avc_start_pgoff, avc_last_pgoff,
73 static inline, __anon_vma_interval_tree)
74
75void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
f808c13f 76 struct rb_root_cached *root)
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77{
78#ifdef CONFIG_DEBUG_VM_RB
79 node->cached_vma_start = avc_start_pgoff(node);
80 node->cached_vma_last = avc_last_pgoff(node);
81#endif
82 __anon_vma_interval_tree_insert(node, root);
83}
84
85void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
f808c13f 86 struct rb_root_cached *root)
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87{
88 __anon_vma_interval_tree_remove(node, root);
89}
90
91struct anon_vma_chain *
f808c13f 92anon_vma_interval_tree_iter_first(struct rb_root_cached *root,
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93 unsigned long first, unsigned long last)
94{
95 return __anon_vma_interval_tree_iter_first(root, first, last);
96}
97
98struct anon_vma_chain *
99anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
100 unsigned long first, unsigned long last)
101{
102 return __anon_vma_interval_tree_iter_next(node, first, last);
103}
104
105#ifdef CONFIG_DEBUG_VM_RB
106void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
107{
108 WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
109 WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
110}
111#endif