Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies

[Jeff Darcy]

On 03/28/2013 02:49 PM, Anand Avati wrote:
> Yes, it should, based on the theory of how ext4 was generating the
> 63bits. But Jeff's test finds that the experiment is not matching the
> theory.

FWIW, I was able to re-run my test in between stuff related to That
Other Problem.  What seems to be happening is that we read correctly
until just after d_off 0x4000000000000000, then we suddenly wrap around
- not to the very first d_off we saw, but to a pretty early one (e.g.
0x0041b6340689a32e).  This is all on a single brick, BTW, so it's pretty
easy to line up the back-end and front-end d_off values which match
perfectly up to this point.

I haven't had a chance to ponder what this all means and debug it
further.  Hopefully I'll be able to do so soon, but I figured I'd
mention it in case something about those numbers rang a bell.