Re: [PATCH] nfs: lookupcache coherence bugs in WCC update path (revised)

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On Fri, Aug 13, 2010 at 5:36 AM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
>
> If you have an easy reproducer it might also be worth experimenting with
> NFSv4 exports of an ext4 system mounted with the i_version option.

I may give that a try.

> Actually: should the NFSv4 server always be using i_version as the
> change attribute for directories?  (Does every exportable filesystem
> update it on every directory modification?)

It appears to be an option for ext4.  I do not see it referenced in XFS.

> (And if so, maybe on directories we should factor the i_version into the
> low bits of the mtime reported to NFSv3 client?)

Probably a bad idea.  Runs the risk of "change file A then change file
B" resulting in backwards timestamps, which is even worse than 4
millisecond timestamps.

 - Pat
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