Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:33078 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751346Ab1LLT4O (ORCPT ); Mon, 12 Dec 2011 14:56:14 -0500 Date: Mon, 12 Dec 2011 14:56:13 -0500 From: "J. Bruce Fields" To: Frank van Maarseveen Cc: Linux NFS mailing list Subject: Re: NFS - lock failover Message-ID: <20111212195613.GC20826@fieldses.org> References: <20111201172415.GA27626@janus> <20111209103646.GA1061@janus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20111209103646.GA1061@janus> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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.