[libvirt] [PATCH 1/2] snapshot: implement getparent for esx

[Eric Blake]

On 10/02/2011 03:32 AM, Matthias Bolte wrote:
> 2011/9/29 Eric Blake<eblake at redhat.com>:
>> Pretty easy to paste together compared to existing functions.
>>
>> * src/esx/esx_driver.c (esxDomainSnapshotGetParent): New function.
>> ---
>>
>> I can only compile-test this; I'm relying on someone with an actual
>> esx setup to actually test it.  Also, I didn't see anything in
>> existing code that would efficiently implement
>> virDomainSnapshotNumChildren; there may an API that I'm not aware of,
>> but someone else will have to implement that API (Matthias?)
>
> This will have to be done by esxVI_GetNumberOfSnapshotTrees that just
> counts the snapshots in the driver. This is one of things where
> vSphere API doesn't translate efficiently to libvirt API.

Actually, virDomainSnapshotNumChildren has two modes (well, it will once 
my API addition series gets reviewed...):

Direct children only, when flags==0 (from looking at 
esxVI_GetNumberOfSnapshotTrees, this looks like it is just a count of 
the for loop through snapshotTreeList)

All descendants, when flags==VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS, which 
is a count of the for loop plus recursion on each child.

Thanks; you pointed me to enough of a hint that I can try and implement it.

Speaking of flags support for various APIs, I'm wondering if 
http://libvirt.org/hvsupport.html should be improved to list the version 
at which each hypervisor added support for each flag, since flags are 
often introduced after the original API, and not all hypervisors support 
all flags.  I'll try and take a look into that.

>
>>   src/esx/esx_driver.c |   41 +++++++++++++++++++++++++++++++++++++++++
>>   1 files changed, 41 insertions(+), 0 deletions(-)
>>
>
> Looks good, tested, works, ACK :)

All right, ESX getParent is now pushed.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org