Re: NFS - lock failover

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On Fri, Dec 09, 2011 at 11:36:46AM +0100, Frank van Maarseveen wrote:
> On Thu, Dec 01, 2011 at 06:24:16PM +0100, Frank van Maarseveen wrote:
> > On Thu, Dec 01, 2011 at 07:07:22PM +0200, Pavel A wrote:
> > > Hi everyone!
> > > 
> > > I was trying not to create new topics, but it seems that posting to an
> > > old one doesn't bring it up. Here is the original topic I'm referring
> > > to: http://comments.gmane.org/gmane.linux.nfs/13108
> > > 
> > > I'm building an A/A cluster using NFS v3 and local file systems, and
> > > looking for
> > > efficient ways for failover (for now I have to restart nfs-kernel-server on
> > > Takeover node to be able to initiate grace period), so the discussed solutions
> > > are very interesting to me.
> > > 
> > > Now (4 years after) in current nfs-utils packages (v. 1.2.2-4 and later) I can
> > > see that the ability to release locks was really implemented and is
> > > working well
> > > (I mean interfaces /proc/fs/nfsd/unlock_ip and
> > > /proc/fs/nfsd/unlock_filesystem),
> > > but how about reacquiring locks on the node, share migrates to? - I've been
> > > going through various mailing lists and found a lot of discussions on the topic
> > > (also dated mainly 2007), but don't seem to find any rpc-based mechanism or
> > > interface like /proc/fs/nfsd/nlm_set_grace to do that, was it ever made?
> > 
> > I've posted a patch some time ago implementing
> > /proc/fs/nfsd/relock_filesystem:
> > 
> > 	http://permalink.gmane.org/gmane.linux.nfs/42360
> > 	http://permalink.gmane.org/gmane.linux.nfs/42361
> > 	http://permalink.gmane.org/gmane.linux.nfs/42362
> 
> Can this patch be scheduled for inclusion in mainline (3.3)?

Could you resend and I'll take another look?

But this should really be fixed to handle v4 locks as well.

--b.
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