113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
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* mm/interval_tree.c - interval tree for mapping->i_mmap
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*
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* Copyright (C) 2012, Michel Lespinasse <walken@google.com>
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*
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* This file is released under the GPL v2.
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*/
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/rmap.h>
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#include <linux/interval_tree_generic.h>
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static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
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{
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return v->vm_pgoff;
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}
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static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
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{
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return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
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}
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INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
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unsigned long, shared.rb_subtree_last,
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vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
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/* Insert node immediately after prev in the interval tree */
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void vma_interval_tree_insert_after(struct vm_area_struct *node,
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struct vm_area_struct *prev,
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struct rb_root_cached *root)
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{
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struct rb_node **link;
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struct vm_area_struct *parent;
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unsigned long last = vma_last_pgoff(node);
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VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
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if (!prev->shared.rb.rb_right) {
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parent = prev;
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link = &prev->shared.rb.rb_right;
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} else {
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parent = rb_entry(prev->shared.rb.rb_right,
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struct vm_area_struct, shared.rb);
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if (parent->shared.rb_subtree_last < last)
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parent->shared.rb_subtree_last = last;
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while (parent->shared.rb.rb_left) {
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parent = rb_entry(parent->shared.rb.rb_left,
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struct vm_area_struct, shared.rb);
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if (parent->shared.rb_subtree_last < last)
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parent->shared.rb_subtree_last = last;
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}
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link = &parent->shared.rb.rb_left;
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}
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node->shared.rb_subtree_last = last;
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rb_link_node(&node->shared.rb, &parent->shared.rb, link);
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rb_insert_augmented(&node->shared.rb, &root->rb_root,
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&vma_interval_tree_augment);
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}
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static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
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{
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return vma_start_pgoff(avc->vma);
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}
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static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
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{
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return vma_last_pgoff(avc->vma);
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}
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INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
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avc_start_pgoff, avc_last_pgoff,
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static inline, __anon_vma_interval_tree)
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void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
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struct rb_root_cached *root)
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{
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#ifdef CONFIG_DEBUG_VM_RB
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node->cached_vma_start = avc_start_pgoff(node);
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node->cached_vma_last = avc_last_pgoff(node);
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#endif
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__anon_vma_interval_tree_insert(node, root);
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}
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void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
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struct rb_root_cached *root)
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{
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__anon_vma_interval_tree_remove(node, root);
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}
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struct anon_vma_chain *
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anon_vma_interval_tree_iter_first(struct rb_root_cached *root,
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unsigned long first, unsigned long last)
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{
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return __anon_vma_interval_tree_iter_first(root, first, last);
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}
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struct anon_vma_chain *
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anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
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unsigned long first, unsigned long last)
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{
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return __anon_vma_interval_tree_iter_next(node, first, last);
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}
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#ifdef CONFIG_DEBUG_VM_RB
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void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
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{
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WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
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WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
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}
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#endif
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