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ext4: optimize orphan_list handling for ext4_setattr
[pandora-kernel.git]
/
mm
/
rmap.c
diff --git
a/mm/rmap.c
b/mm/rmap.c
index
f6f0d2d
..
9d2ba01
100644
(file)
--- a/
mm/rmap.c
+++ b/
mm/rmap.c
@@
-1564,13
+1564,14
@@
static void __hugepage_set_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, int exclusive)
{
struct anon_vma *anon_vma = vma->anon_vma;
struct vm_area_struct *vma, unsigned long address, int exclusive)
{
struct anon_vma *anon_vma = vma->anon_vma;
+
BUG_ON(!anon_vma);
BUG_ON(!anon_vma);
- if (!exclusive) {
- struct anon_vma_chain *avc;
- avc = list_entry(vma->anon_vma_chain.prev,
- struct anon_vma_chain, same_vma);
- anon_vma = a
vc->anon_vma
;
- }
+
+ if (PageAnon(page))
+ return;
+ if (!exclusive)
+ anon_vma = a
non_vma->root
;
+
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
page->mapping = (struct address_space *) anon_vma;
page->index = linear_page_index(vma, address);
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
page->mapping = (struct address_space *) anon_vma;
page->index = linear_page_index(vma, address);
@@
-1581,6
+1582,8
@@
void hugepage_add_anon_rmap(struct page *page,
{
struct anon_vma *anon_vma = vma->anon_vma;
int first;
{
struct anon_vma *anon_vma = vma->anon_vma;
int first;
+
+ BUG_ON(!PageLocked(page));
BUG_ON(!anon_vma);
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
first = atomic_inc_and_test(&page->_mapcount);
BUG_ON(!anon_vma);
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
first = atomic_inc_and_test(&page->_mapcount);