Re: [PATCH] task_work: remove fifo ordering guarantee

From: Oleg Nesterov
Date: Mon Aug 31 2015 - 08:47:41 EST

On 08/29, Linus Torvalds wrote:
> On Sat, Aug 29, 2015 at 7:11 AM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> >
> > If this needs to be kept, maybe then add following, to make sure
> > we flush the list at most every BITS_PER_LONG files
> Hmm.
> I'm wondering if we should just make close_files() (or maybe even
> filp_close()) use a synchronous fput().

Heh. I thought about the same change. So perhaps it is even the right
thing to do. Still I am worried, because "it can't be that simple" ;)

And, with this change close_files() is called before exit_fs() and
exit_task_namespaces(). This is fine (iiuc), but this means that the
creative code in drivers/ can (wrongly) rely on this fact again. IIRC,
the change which moved __fput() into task_work_exit() uncovered some
interesting problems, like filp_open() called from fop->release().

Anyway, this is the question to Al, I guess.


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