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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.rb,
25 unsigned long, shared.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(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
38
39 if (!prev->shared.rb.rb_right) {
40 parent = prev;
41 link = &prev->shared.rb.rb_right;
42 } else {
43 parent = rb_entry(prev->shared.rb.rb_right,
44 struct vm_area_struct, shared.rb);
45 if (parent->shared.rb_subtree_last < last)
46 parent->shared.rb_subtree_last = last;
47 while (parent->shared.rb.rb_left) {
48 parent = rb_entry(parent->shared.rb.rb_left,
49 struct vm_area_struct, shared.rb);
50 if (parent->shared.rb_subtree_last < last)
51 parent->shared.rb_subtree_last = last;
52 }
53 link = &parent->shared.rb.rb_left;
54 }
55
56 node->shared.rb_subtree_last = last;
57 rb_link_node(&node->shared.rb, &parent->shared.rb, link);
58 rb_insert_augmented(&node->shared.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
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * mm/interval_tree.c - interval tree for mapping->i_mmap
4 *
5 * Copyright (C) 2012, Michel Lespinasse <walken@google.com>
6 */
7
8#include <linux/mm.h>
9#include <linux/fs.h>
10#include <linux/rmap.h>
11#include <linux/interval_tree_generic.h>
12
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{
20 return v->vm_pgoff + vma_pages(v) - 1;
21}
22
23INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
24 unsigned long, shared.rb_subtree_last,
25 vma_start_pgoff, vma_last_pgoff, /* empty */, vma_interval_tree)
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,
30 struct rb_root_cached *root)
31{
32 struct rb_node **link;
33 struct vm_area_struct *parent;
34 unsigned long last = vma_last_pgoff(node);
35
36 VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
37
38 if (!prev->shared.rb.rb_right) {
39 parent = prev;
40 link = &prev->shared.rb.rb_right;
41 } else {
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;
51 }
52 link = &parent->shared.rb.rb_left;
53 }
54
55 node->shared.rb_subtree_last = last;
56 rb_link_node(&node->shared.rb, &parent->shared.rb, link);
57 rb_insert_augmented(&node->shared.rb, &root->rb_root,
58 &vma_interval_tree_augment);
59}
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,
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,
76 struct rb_root_cached *root)
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,
86 struct rb_root_cached *root)
87{
88 __anon_vma_interval_tree_remove(node, root);
89}
90
91struct anon_vma_chain *
92anon_vma_interval_tree_iter_first(struct rb_root_cached *root,
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