Re: [man-pages RFC PATCH v4] statx, inode: document the new STATX_INO_VERSION field

Jeff Layton
2022-09-12T10:43:32Z

On Sun, 2022-09-11 at 08:13 +1000, NeilBrown wrote:
> On Fri, 09 Sep 2022, Jeff Layton wrote:
> >
> > The machine crashes and comes back up, and we get a query for i_version
> > and it comes back as X. Fine, it's an old version. Now there is a write.
> > What do we do to ensure that the new value doesn't collide with X+1?
>
> (I missed this bit in my earlier reply..)
>
> How is it "Fine" to see an old version?
> The file could have changed without the version changing.
> And I thought one of the goals of the crash-count was to be able to
> provide a monotonic change id.
>

"Fine" in the sense that we expect that to happen in this situation.
It's not fine for the clients obviously, which is why we're discussing
mitigation techniques.
--
Jeff Layton <jlayton@kernel.org>