On Tue, 2006-12-19 at 02:32 -0800, Andrew Morton wrote:
> On Tue, 19 Dec 2006 20:56:50 +1100
> Nick Piggin <[EMAIL PROTECTED]> wrote:
>
> > Linus Torvalds wrote:
> >
> > > NOTICE? First you make a BIG DEAL about how dirty bits should never get
> > > lost, but THE VERY SAME FUNCTION actually very much on purpose DOES drop
> > > the dirty bit for when it's not in the page tables.
> >
> > try_to_free_buffers is quite a special case, where we're transferring
> > the page dirty metadata from the buffers to the page. I think Andrew
> > would have a better grasp of it so he could correct me, but what it
> > does is legitimate.
>
> Well it used to be. After 2.6.19 it can do the wrong thing for mapped
> pages. But it turns out that we don't feed it mapped pages, apart from
> pagevec_strip() and possibly races against pagefaults.
So how about this:
Index: linux-2.6-git/mm/page-writeback.c
===================================================================
--- linux-2.6-git.orig/mm/page-writeback.c 2006-12-19 08:24:48.000000000
+0100
+++ linux-2.6-git/mm/page-writeback.c 2006-12-19 11:43:31.000000000 +0100
@@ -859,6 +859,9 @@ int test_clear_page_dirty(struct page *p
struct address_space *mapping = page_mapping(page);
unsigned long flags;
+ if (page_mapped(page))
+ return 0;
+
if (!mapping)
return TestClearPageDirty(page);
-
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