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Re: [libvirt] [PATCHv4 1/7] interface: new public API for network config change transactions



On Thu, May 26, 2011 at 12:17:39PM -0400, Laine Stump wrote:
> From: Michal Privoznik <mprivozn redhat com>
> 
> No change from previously ACKed patch.
> 
> This is the API agreed on in:
> 
>   https://www.redhat.com/archives/libvir-list/2011-May/msg00026.html
> 
> (with a slight name change to use "...begin" rather than
> "...start"). This implements transactional changes to the host network
> config. When a transaction is begun with ncf_change_begin(), all other
> netcf APIs will continue to work as they always have, but a snapshot
> of the existing config will be taken, allowing reversion (rollback,
> using ncf_change_rollback()) to the exact state of config at the time
> ncf_change_begin() was called. Alternately, if it's determined that
> the new changes are acceptable, ncf_change_commit() can be called,
> which will eliminate the snapshot and make the changes permanent.
> 
> As a failsafe measure, if neither ncf_change_commit() or
> ncf_change_rollback() is called by the next time the system reboots,
> the netcf-transaction initscript will be automatically called to
> rollback the changes.
> ---
>  include/libvirt/libvirt.h.in |    7 +++++++
>  src/libvirt_public.syms      |    3 +++
>  2 files changed, 10 insertions(+), 0 deletions(-)
> 
> diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
> index 7cd6e13..4a45390 100644
> --- a/include/libvirt/libvirt.h.in
> +++ b/include/libvirt/libvirt.h.in
> @@ -1405,6 +1405,13 @@ int                     virInterfaceDestroy       (virInterfacePtr iface,
>  int                     virInterfaceRef           (virInterfacePtr iface);
>  int                     virInterfaceFree          (virInterfacePtr iface);
>  
> +int                     virInterfaceChangeBegin   (virConnectPtr conn,
> +                                                   unsigned int flags);
> +int                     virInterfaceChangeCommit  (virConnectPtr conn,
> +                                                   unsigned int flags);
> +int                     virInterfaceChangeRollback(virConnectPtr conn,
> +                                                   unsigned int flags);
> +
>  /**
>   * virStoragePool:
>   *
> diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
> index 0590535..f4f8262 100644
> --- a/src/libvirt_public.syms
> +++ b/src/libvirt_public.syms
> @@ -442,6 +442,9 @@ LIBVIRT_0.9.2 {
>          virDomainInjectNMI;
>          virDomainScreenshot;
>          virDomainSetSchedulerParametersFlags;
> +        virInterfaceChangeBegin;
> +        virInterfaceChangeCommit;
> +        virInterfaceChangeRollback;
>  } LIBVIRT_0.9.0;
>  
>  # .... define new API here using predicted next version number ....

ACK

Daniel
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