From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O52WI-0002Mq-U6 for qemu-devel@nongnu.org; Thu, 22 Apr 2010 15:57:07 -0400 Received: from [140.186.70.92] (port=49898 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O52WH-0002LQ-BK for qemu-devel@nongnu.org; Thu, 22 Apr 2010 15:57:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O52WF-0003IK-J5 for qemu-devel@nongnu.org; Thu, 22 Apr 2010 15:57:05 -0400 Received: from isrv.corpit.ru ([81.13.33.159]:47890) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O52WF-0003I2-8h for qemu-devel@nongnu.org; Thu, 22 Apr 2010 15:57:03 -0400 Message-ID: <4BD0AA0D.9080400@msgid.tls.msk.ru> Date: Thu, 22 Apr 2010 23:57:01 +0400 From: Michael Tokarev MIME-Version: 1.0 Subject: Re: [Qemu-devel] Locking block devices for concurrent access? References: <4BA1323F.6080501@msgid.tls.msk.ru> <4BD0972E.9080709@codemonkey.ws> <20100422192109.GI5858@amd.home.annexia.org> In-Reply-To: <20100422192109.GI5858@amd.home.annexia.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Richard W.M. Jones" Cc: qemu-devel 22.04.2010 23:21, Richard W.M. Jones wrote: > On Thu, Apr 22, 2010 at 01:36:30PM -0500, Anthony Liguori wrote: >> I think we got to the point where there was general agreement on the >> usefulness of lock=read|write but where there was still some contention >> was on this whole notion of lock=exclusive|shared. For that, there's a good reply by Daniel P. Berrange, there: http://marc.info/?l=qemu-devel&m=126018305619696&w=2 > From the libguestfs point of view, any sort of locking would be > preferable to the current situation. If someone wants to run with the > patch, I posted several versions and there was a lot of discussion on > qemu-devel in Nov/Dec 2009, starting with this message: > > Subject: [Qemu-devel] [PATCH] Disk image shared and exclusive locks. > Message-ID:<20091204165301.GA4167@amd.home.annexia.org> Aha, this is the discussion I were trying to find, but failed for some unknown reason. Thank you Richard, I'm rehashing it all now... /mjt