Re: [PATCH] cramfs corruption after BLKFLSBUF on loop device

[Olaf Hering]

 On Fri, Jun 02, Andrew Morton wrote:

> On Fri, 2 Jun 2006 10:43:27 +0200
> Olaf Hering <olh@xxxxxxx> wrote:
> 
> >  On Thu, Jun 01, Andrew Morton wrote:
> > 
> > 
> > > > Do you want it like that?
> > > > 
> > > > lock_page(page);
> > > > if (PageUptodate(page)) {
> > > >         SetPageDirty(page);
> > > >         mb();
> > > >         return page;
> > > > }
> > > 
> > > Not really ;)  It's hacky.  It'd be better to take a lock.
> > 
> > Which lock exactly?
> 
> Ah, sorry, there isn't such a lock.  I was just carrying on.
> 
> > I'm not sure how to proceed from here.
> 
> I'd suggest you run SetPagePrivate() and SetPageChecked() on the locked
> page and implement a_ops.releasepage(), which will fail if PageChecked(),
> and will succeed otherwise:

No leak without tweaking PG_private.
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