9826a516ff
Update the generic interval tree code that was introduced in "mm: replace vma prio_tree with an interval tree". Changes: - fixed 'endpoing' typo noticed by Andrew Morton - replaced include/linux/interval_tree_tmpl.h, which was used as a template (including it automatically defined the interval tree functions) with include/linux/interval_tree_generic.h, which only defines a preprocessor macro INTERVAL_TREE_DEFINE(), which itself defines the interval tree functions when invoked. Now that is a very long macro which is unfortunate, but it does make the usage sites (lib/interval_tree.c and mm/interval_tree.c) a bit nicer than previously. - make use of RB_DECLARE_CALLBACKS() in the INTERVAL_TREE_DEFINE() macro, instead of duplicating that code in the interval tree template. - replaced vma_interval_tree_add(), which was actually handling the nonlinear and interval tree cases, with vma_interval_tree_insert_after() which handles only the interval tree case and has an API that is more consistent with the other interval tree handling functions. The nonlinear case is now handled explicitly in kernel/fork.c dup_mmap(). Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Daniel Santos <daniel.santos@pobox.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.8 KiB
C
60 lines
1.8 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/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.linear.rb,
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unsigned long, shared.linear.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 *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_start_pgoff(node) != vma_start_pgoff(prev));
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if (!prev->shared.linear.rb.rb_right) {
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parent = prev;
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link = &prev->shared.linear.rb.rb_right;
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} else {
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parent = rb_entry(prev->shared.linear.rb.rb_right,
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struct vm_area_struct, shared.linear.rb);
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if (parent->shared.linear.rb_subtree_last < last)
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parent->shared.linear.rb_subtree_last = last;
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while (parent->shared.linear.rb.rb_left) {
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parent = rb_entry(parent->shared.linear.rb.rb_left,
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struct vm_area_struct, shared.linear.rb);
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if (parent->shared.linear.rb_subtree_last < last)
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parent->shared.linear.rb_subtree_last = last;
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}
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link = &parent->shared.linear.rb.rb_left;
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}
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node->shared.linear.rb_subtree_last = last;
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rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
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rb_insert_augmented(&node->shared.linear.rb, root,
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&vma_interval_tree_augment);
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}
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