[libvirt] [RFC] Image Fleecing for Libvirt (BZ 955734, 905125)
Wenchao Xia
xiawenc at linux.vnet.ibm.com
Mon Jul 29 08:44:20 UTC 2013
于 2013-7-24 21:11, Wenchao Xia 写道:
> 于 2013-7-24 17:44, Paolo Bonzini 写道:
>> Il 24/07/2013 07:38, Wenchao Xia ha scritto:
>>>>>
>>>>> Because libvirt would use a local (Unix) socket to communicate with
>>>>> QEMU
>>>>> and pass the file descriptor, there is no need to authenticate the NBD
>>>>> connection. There is no need for ticketing, though if necessary we
>>>>> can
>>>>> make QEMU only accept connections from libvirtd's pid. libvirt and
>>>>> VDSM
>>>>> already do authentication and/or encryption.
>>>
>>> How do I get the info about IP/port needed to access that snapshot?
>>> call virSnapshotGetInfo(or similar API) later?
>>
>> See above. You don't, you use the libvirt channel.
>>
>> Paolo
>>
> So I will got a libvirt API like
> virSnapshotRead(Domain *domain, SnapshotPtr *sn,
> uint64 sector_num, uint64 sector_len,
> char *buf)?
> then libvirt automatically access the snapshot and fill
> the buffer for user? A API let me access in some way
> would be my concern.
>
I found the API doc online:
int virDomainBlockPeek (virDomainPtr dom,
const char * disk,
unsigned long long offset,
size_t size,
void * buffer,
unsigned int flags)
Guess the problem is extend it to work with snapshot.
--
Best Regards
Wenchao Xia
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