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Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening |
Date: |
Wed, 11 May 2016 16:04:40 +0800 |
User-agent: |
Mutt/1.6.1 (2016-04-27) |
On Tue, 05/10 13:22, Daniel P. Berrange wrote:
> On Tue, May 10, 2016 at 01:11:30PM +0100, Richard W.M. Jones wrote:
> > At no point did I say that it was safe to use libguestfs on live VMs
> > or that you would always get consistent data out.
> >
> > But the fact that it can fail is understood, the chance of failure is
> > really tiny (it has literally only happened twice that I've read
> > corrupted data, in years of daily use), and the operation is very
> > useful.
> >
> > So I think this patch series should either not lock r/o VMs, or should
> > add a nolock flag to override the locking (which libguestfs will
> > always use).
It sounds you are happy with either way but actually this series does both. So,
would it be okay for libguestfs if we go for "lock r/o VMs by default and
provide nolock flag"? It would then have the best default for non-libguestfs
users.
Fam
>
> If QEMU locks r/o disks, then libvirt would likely end up setting the
> "nolock" flag unconditionally too, in order to avoid breaking libguestfs
> and other application usage of libvirt.
>
> Regards,
> Daniel
> --
> |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
> |: http://libvirt.org -o- http://virt-manager.org :|
> |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
> |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, (continued)
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Daniel P. Berrange, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Markus Armbruster, 2016/05/11
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Daniel P. Berrange, 2016/05/11
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening,
Fam Zheng <=
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/11
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/11
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Daniel P. Berrange, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Kevin Wolf, 2016/05/10
- Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/10
Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening, Richard W.M. Jones, 2016/05/11