[Ocfs2-devel] [PATCH] ocfs2: fix shift left overflow

[Andrew Morton]

On Wed, 29 Jul 2015 08:30:59 +0800 Joseph Qi <joseph.qi at huawei.com> wrote:

> On 2015/7/29 4:51, Andrew Morton wrote:
> > On Mon, 27 Jul 2015 11:39:16 +0800 Joseph Qi <joseph.qi at huawei.com> wrote:
> > 
> >> cluster pos is defined as u32, when calculate corresponding sector it
> >> should be converted to u64 first, otherwise it may overflow.
> > 
> > What are the runtime effects of this change?
> > 
> The issue is when using large volume, for example, 9T volume with 2T already
> used, frequently create small files with O_DIRECT and the IO is not cluster
> aligned, it may clear sectors in the wrong place.

You mean it corrupts the filesystem?

So this wants to be merged asap and backported as far as possible?