From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=47430 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PkEMO-0005CP-Oq for qemu-devel@nongnu.org; Tue, 01 Feb 2011 06:25:27 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PkEMM-00036Y-66 for qemu-devel@nongnu.org; Tue, 01 Feb 2011 06:25:24 -0500 Received: from mxs.selfip.ru ([77.221.143.26]:46981 helo=mxs.selfmail.ru) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PkEML-000350-Nq for qemu-devel@nongnu.org; Tue, 01 Feb 2011 06:25:22 -0500 Subject: Re: [Qemu-devel] [PATCH 0/2] virtagent - fsfreeze support From: Vasiliy G Tolstov In-Reply-To: <1296557928-30019-1-git-send-email-Jes.Sorensen@redhat.com> References: <1296557928-30019-1-git-send-email-Jes.Sorensen@redhat.com> Content-Type: text/plain; charset="UTF-8" Date: Tue, 01 Feb 2011 14:25:12 +0300 Message-ID: <1296559512.9430.1.camel@vase> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Reply-To: v.tolstov@selfip.ru List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jes.Sorensen@redhat.com Cc: agl@us.ibm.com, qemu-devel@nongnu.org, mdroth@linux.vnet.ibm.com On Tue, 2011-02-01 at 11:58 +0100, Jes.Sorensen@redhat.com wrote: > From: Jes Sorensen > > Hi > > This is a first attempt to add fsfreeze support to virtagent. The idea > is for the guest agent to walk the list of locally mounted file > systems in the guest, and issuing an ioctl to freeze them. The host > can then do a live snapshot of the guest, obtaining stable file > systems. After the snapshot, the host then calls the thaw function in > virtagent, which goes through the list of previously frozen file > systems and unfreezes them. > > The list walking ignores remote file systems such as NFS and CIFS as > well as all pseudo file systems. > > The guest agent code is in the first patch, and host agent code is in > the second patch. For now there is only human monitor support, but it > should be pretty straight forward to add QMP support as well. > > Patches are against the virtagent-dev git tree. > > Comments and suggestions welcome! > > Cheers, > Jes Hello. Very nice feature. Sorry for offropic, but can this feature can be used to modify partiotion table on already mounted device (for example root on ext3? ) Thank You. -- Vasiliy G Tolstov Selfip.Ru