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Re: [libvirt] [PATCH 00/23] Introduce a virtlockd daemon for disk locking

On 08/09/2012 09:20 AM, Daniel P. Berrange wrote:
> This is a long overdue update to a patch series I posted about
> a year ago
>   https://www.redhat.com/archives/libvir-list/2011-July/msg00337.html
> There have been some major changes since that series

Getting closer!  I think the overall design is sound, and I have now
completed reviews of the entire series (instead of getting stuck at the
beginning); looking forward to a final rebase to clear up the questions
I raised on this round of review.

> Still todo
>  - Add ability to quiesce all server/client I/O when doing
>    re-exec()
>  - Add ability to save/restore data in any virNetMessagePtr
>    structs in the client rx or tx queues
>  - Add ability to use custom lockspaces for LVM and SCSI/ISCSI
>    block devices, instead of locking based on path, to gain
>    cross-node safety, instead of node-local safety.
> NB, the current re-exec() support works, but is not race safe
> without those first 2 todo items being completed

Yeah, but it's still a strict improvement over the 'nop' manager for
out-of-the-box experience, so I don't mind if we push this series for
0.10.0 even without those to-do items resolved yet.  I think the design
is extensible enough that we aren't locking ourselves into an inability
to implement them.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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