mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
ac51b934f3
After removing vma->shared.nonlinear we have only one member of vma->shared union, which doesn't make much sense. This patch drops the union and move struct vma->shared.linear to vma->shared. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
|
|
* mm/interval_tree.c - interval tree for mapping->i_mmap
|
|
*
|
|
* Copyright (C) 2012, Michel Lespinasse <walken@google.com>
|
|
*
|
|
* This file is released under the GPL v2.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/rmap.h>
|
|
#include <linux/interval_tree_generic.h>
|
|
|
|
static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
|
|
{
|
|
return v->vm_pgoff;
|
|
}
|
|
|
|
static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
|
|
{
|
|
return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
|
|
}
|
|
|
|
INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
|
|
unsigned long, shared.rb_subtree_last,
|
|
vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
|
|
|
|
/* Insert node immediately after prev in the interval tree */
|
|
void vma_interval_tree_insert_after(struct vm_area_struct *node,
|
|
struct vm_area_struct *prev,
|
|
struct rb_root *root)
|
|
{
|
|
struct rb_node **link;
|
|
struct vm_area_struct *parent;
|
|
unsigned long last = vma_last_pgoff(node);
|
|
|
|
VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
|
|
|
|
if (!prev->shared.rb.rb_right) {
|
|
parent = prev;
|
|
link = &prev->shared.rb.rb_right;
|
|
} else {
|
|
parent = rb_entry(prev->shared.rb.rb_right,
|
|
struct vm_area_struct, shared.rb);
|
|
if (parent->shared.rb_subtree_last < last)
|
|
parent->shared.rb_subtree_last = last;
|
|
while (parent->shared.rb.rb_left) {
|
|
parent = rb_entry(parent->shared.rb.rb_left,
|
|
struct vm_area_struct, shared.rb);
|
|
if (parent->shared.rb_subtree_last < last)
|
|
parent->shared.rb_subtree_last = last;
|
|
}
|
|
link = &parent->shared.rb.rb_left;
|
|
}
|
|
|
|
node->shared.rb_subtree_last = last;
|
|
rb_link_node(&node->shared.rb, &parent->shared.rb, link);
|
|
rb_insert_augmented(&node->shared.rb, root,
|
|
&vma_interval_tree_augment);
|
|
}
|
|
|
|
static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
|
|
{
|
|
return vma_start_pgoff(avc->vma);
|
|
}
|
|
|
|
static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
|
|
{
|
|
return vma_last_pgoff(avc->vma);
|
|
}
|
|
|
|
INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
|
|
avc_start_pgoff, avc_last_pgoff,
|
|
static inline, __anon_vma_interval_tree)
|
|
|
|
void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
|
|
struct rb_root *root)
|
|
{
|
|
#ifdef CONFIG_DEBUG_VM_RB
|
|
node->cached_vma_start = avc_start_pgoff(node);
|
|
node->cached_vma_last = avc_last_pgoff(node);
|
|
#endif
|
|
__anon_vma_interval_tree_insert(node, root);
|
|
}
|
|
|
|
void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
|
|
struct rb_root *root)
|
|
{
|
|
__anon_vma_interval_tree_remove(node, root);
|
|
}
|
|
|
|
struct anon_vma_chain *
|
|
anon_vma_interval_tree_iter_first(struct rb_root *root,
|
|
unsigned long first, unsigned long last)
|
|
{
|
|
return __anon_vma_interval_tree_iter_first(root, first, last);
|
|
}
|
|
|
|
struct anon_vma_chain *
|
|
anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
|
|
unsigned long first, unsigned long last)
|
|
{
|
|
return __anon_vma_interval_tree_iter_next(node, first, last);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_VM_RB
|
|
void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
|
|
{
|
|
WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
|
|
WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
|
|
}
|
|
#endif
|