On Fri, Aug 13, 2010 at 04:36:32PM -0400, Stefan Berger wrote:
>
>
> This time with a proper title.
>
> v3:
> - Fixed an indentation problem
>
> - added bool parameter to function terminating the IP address
> learner threads to determine whether future threads may still run
> (needed in case of driver reload) or all must terminate (need in case of
> libvirtd termination)
>
> v2:
>
> - Fixes to the nwfilter driver reload function that also needs a
> valid virConnectPtr.
>
> In this patch I am extending and fixing the nwfilter module's reload
> support to stop all ongoing threads (for learning IP addresses of
> interfaces) and rebuild the filtering rules of all interfaces of all VMs
> when libvirt is started. Now libvirtd rebuilds the filters upon the
> SIGHUP signal and libvirtd restart.
>
> About the patch: The nwfilter functions require a virConnectPtr.
> Therefore I am opening a connection in qemudStartup, which later on
> needs to be closed outside where the driver lock is held since otherwise
> it ends up in a deadlock due to virConnectClose() trying to lock the
> driver as well.
>
> I have tested this now for a while with several machines running and
> needing the IP address learner thread(s). The rebuilding of the firewall
> rules seems to work fine following libvirtd restart or a SIGHUP. Also
> the termination of libvirtd worked fine.
>
>
> Signed-off-by: Stefan Berger<stef...@us.ibm.com>
>
> ---
> src/nwfilter/nwfilter_driver.c | 21 +++++++++++---
> src/nwfilter/nwfilter_learnipaddr.c | 16 ++++++++---
> src/nwfilter/nwfilter_learnipaddr.h | 1
> src/qemu/qemu_driver.c | 52
> +++++++++++++++++++++++++++++++++---
> 4 files changed, 77 insertions(+), 13 deletions(-)
>
> Index: libvirt-acl/src/nwfilter/nwfilter_driver.c
> ===================================================================
> --- libvirt-acl.orig/src/nwfilter/nwfilter_driver.c
> +++ libvirt-acl/src/nwfilter/nwfilter_driver.c
> @@ -143,15 +143,26 @@ conf_init_err:
> */
> static int
> nwfilterDriverReload(void) {
> + virConnectPtr conn;
> +
> if (!driverState) {
> return -1;
> }
>
> - nwfilterDriverLock(driverState);
> - virNWFilterPoolLoadAllConfigs(NULL,
> - &driverState->pools,
> - driverState->configDir);
> - nwfilterDriverUnlock(driverState);
> + conn = virConnectOpen("qemu:///system");
> +
> + if (conn) {
> + /* shut down all threads -- qemud for example will restart them */
> + virNWFilterLearnThreadsTerminate(true);
> +
> + nwfilterDriverLock(driverState);
> + virNWFilterPoolLoadAllConfigs(conn,
> + &driverState->pools,
> + driverState->configDir);
> + nwfilterDriverUnlock(driverState);
> +
> + virConnectClose(conn);
> + }
This identation still seems to be wrong - so was the code being
replaced. ACK aside from that
Daniel
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