Re: Corruption with O_DIRECT and unaligned user buffers

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Fri, 19 Dec 2008 11:21:25 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> On Thu, 18 Dec 2008 16:29:52 +0100
> Andrea Arcangeli <aarcange@redhat.com> wrote:
> 
> > @@ -484,11 +476,34 @@
> >  	if (page) {
> >  		get_page(page);
> >  		page_dup_rmap(page);
> > +		if (is_cow_mapping(vm_flags) && PageAnon(page)) {
> > +			if (unlikely(TestSetPageLocked(page)))
> > +				forcecow = 1;
> > +			else {
> > +				if (unlikely(page_count(page) !=
> > +					     page_mapcount(page)
> > +					     + !!PageSwapCache(page)))
> > +					forcecow = 1;
> > +				unlock_page(page);
> > +			}
> > +		}
> >  		rss[!!PageAnon(page)]++;
> >  	}
>  - Why do you check only Anon rather than all MAP_PRIVATE mappings ?
> 
Sorry, ignore this quesiton.

-Kame

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