On Wed, Jan 04, 2017 at 07:16:03PM +0200, Ala Hino wrote:
> I understand that libvirt provides async events that are triggered once the
> block job reaches ready state and successfully pivots as it is reported by
> qemu.
> Whats the event that is triggered and what's the handler that we have to
> implement?
The exact event is: BLOCK_JOB_READY
Also, as Peter Krempa once pointed out, the above is exposed via XML:
Libvirt expose the state of the copy job in the XML and forward the
READY event from qemu to the users.
A running copy job exposes itself in the xml as:
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/systemrescuecd-x86-4.8.0.iso'/>
<backingStore/>
<mirror type='file' file='/tmp/ble.img' format='raw' job='copy'>
<format type='raw'/>
<source file='/tmp/ble.img'/>
</mirror>
[...]
</disk>
While the ready copy job is exposed as:
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/systemrescuecd-x86-4.8.0.iso'/>
<backingStore/>
<mirror type='file' file='/tmp/ble.img' format='raw' job='copy' ready='yes'>
<format type='raw'/>
<source file='/tmp/ble.img'/>
</mirror>
[...]
</disk>
> To be more specific, I am looking for the onEVENT callback method that is
> invoked when the event is fired.
Afraid, I don't know the exact callback you have to implement. Perhaps
Peter or Eric Blake can say.
But some more related context (lots of reading), as the issue is a bit
more complicated.
You might also want to look at the below two bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1382165 --
virDomainGetBlockJobInfo: Adjust job reporting based on QEMU stats &
the "ready" field of `query-block-jobs`
And (now fixed):
https://bugzilla.redhat.com/show_bug.cgi?id=1372613 -- Improve live
block device job status reporting via virDomainBlockJobInfo()
And may want to go through this entire thread:
https://www.redhat.com/archives/libvir-list/2016-October/msg00217.html
-- RFC: Exposing "ready" bool (of `query-block-jobs`) or QMP
BLOCK_JOB_READY event
[...]
--
/kashyap
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