Re: [Qemu-devel] [RFC PATCH v2 00/11] qemu-ga: fsfreeze on Windows using VSS

[Tomoki Sekiyama]

Hi,

On 4/23/13 12:44 , "Tomoki Sekiyama" <address@hidden> wrote:
>>    2 executing the command "{"execute":"guest-fsfreeze-freeze"}"
>>failed,the output is:
><snip>
>> {"execute":"guest-fsfreeze-freeze"}
>> {"error": {"class": "GenericError", "desc": "Failed to
>>pVssbc->SetContext. (Error: 8004231b) "}}
>> 
>> Could you give me some advise to debug this problem ? I can provide more
>>information if need.
>
>Is there any logs corresponding to the error in Event Viewer?
>
>And this might be caused by unsupported VSS_VOLSNAP_ATTR_* flags in
>SetContext()
>called from qga_vss_fsfreeze_freeze() at qga/vss-win32-requester.cpp,
>but I couldn't find out flags not supported on Windows 7 from VSS
>references.

I'm investigating this issue. Some versions of Windows seem to
ignore VSS_VOLSNAP_ATTR_NO_AUTORECOVERY, and to cause an error with
VSS_VOLSNAP_ATTR_TRANSPORTABLE. In such cases, we cannot disable
Auto-recovery that requires writable snapshots we don't yet support.
Because of this, even if we remove TRANSPORTABLE flag, auto-recovery
would be enabled and cause another error (VSS_E_OBJECT_NOT_FOUND) on thaw.

The patch attached (to be applied after v2 patch) removes TRANSPORTABLE
flag, and ignores the VSS_E_OBJECT_NOT_FOUND error on thaw.
I think this should resolve the issue in Windows 7, and also works in
the other versions of Windows. Could you try this?

If it works, I will merge this into my path set and resend it as v3.

Thanks,
Tomoki Sekiyama

ignore-notfound.patch
Description: ignore-notfound.patch