Re: [PATCH] Fix vmtruncate race and distributed filesystem race

Andrea Arcangeli (andrea@suse.de)
Mon, 23 Jun 2003 10:10:16 +0200


On Mon, Jun 23, 2003 at 12:56:23AM -0700, Andrew Morton wrote:
> Andrea Arcangeli <andrea@suse.de> wrote:
> >
> > that will finally close the race
>
> Could someone please convince me that we really _need_ to close it?
>
> The VM handles the whacky pages OK (on slowpaths), and when this first came
> up two years ago it was argued that the application was racy/buggy
> anyway. So as long as we're secure and stable, we don't care. Certainly
> not to the point of adding more atomic ops on the fastpath.
>
> So... what bug are we actually fixing here?

we're fixing userspace data corruption with an app trapping SIGBUS.

>
>
> (I'd also like to see a clearer description of the distributed fs problem,
> and how this fixes it).

I certainly would like discussions about it too.

Andrea
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