[Linux-cluster] Re: [NFS] [RFC] NLM lock failover admin interface

[Wendy Cheng]

On Wed, 2006-06-14 at 02:54 -0400, Wendy Cheng wrote:

> 
> Assume we still have this on the table.... Could I expect the admin
> interface goes thru rpc.lockd command (man page and nfs-util code
> changes) ? The modified command will take similar options as rpc.statd;
> more specifically, the -n, -o, and -p (see "man rpc.statd"). To pass the
> individual IP (socket address) to kernel, we'll need nfsctl with struct
> nfsctl_svc modified.

I want to make sure people catch this. Here we're talking about NFS
system call interface changes. We need either a new NFS syscall or
altering the existing nfsctl_svc structure.

-- Wendy

> 
> For the kernel piece, since we're there anyway, could we have the
> individual lockd IP interface passed to SM (statd) (in SM_MON call) ?
> This would allow statd to structure its SM files based on each lockd IP
> address, an important part of lock recovery.
> 
> >   One is to register a callback when an interface is shut down.
> 
> Haven't checked out (linux) socket interface yet. I'm very fuzzy how
> this can be done. Anyone has good ideas ? 
> 
> >   Another (possibly the best) is to arrange a new signal for lockd
> >   which say "Drop any locks which were sent to IP addresses that are
> >   no longer valid local addresses".
> 
> Very appealing - but the devil's always in the details. How to decide
> which IP address is no longer valid ? Or how does lockd know about these
> IP addresses ? And how to associate one particular IP address with the
> "struct nlm_file" entries within nlm_files list ? Need few more days to
> sort this out (or any one already has ideas in mind ?).
> 
> -- Wendy
> 
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