Re: HEADS-UP: nearing nfs-utils 1.1.0 and statd changes.

["J. Bruce Fields" <bfields@fieldses.org>]

On Fri, Mar 16, 2007 at 07:00:21PM +1100, Neil Brown wrote:
> Statd currently does several very different things.
> 1/ It listens for monitor requests from lockd and creates
>    files in /var/lib/nfs/sm/HOST
> 2/ It listens for notifications from peers and tells lockd
>    that those peers have restarted.
> 3/ It moves files from sm/ to sm.bak/ and then tries to 
>    notify every host listed in sm.bak/
> 
> The first is very similar to what NFSv4 needs for state management,
> though is somewhat simpler.  I would like to create a better
> interface for the kernel to ask for state to be stored, and then use
> if for NFSv4 and NLM, subsuming this function.

NFSv4 needs something like the third as well--knfsd needs to know on
startup the list of clients that will be allowed to reclaim state from a
previous boot instance.  (This is to protect clients that *think*
they're still holding locks on the server, but (thanks to a network
partition) don't realize that the server has actually rebooted twice.)

--b.

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