Re: [Qemu-devel] [PATCH 0/3] qga: vss-win32: Fix interference with other VSS requesters

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Tomoki Sekiyama (2014-01-13 11:25:14)
> Current functionarity of qemu-ga VSS provider is limited to implement
> filesystems freeze, and doesn't support the creation of shadow copies
> within the guest.
> However, when no other hardware snapshot provider is installed, VSS may
> choose qemu-ga VSS provider to create shadow copies and fail with
> VSS_E_UNEXPECTED_PROVIDER_ERROR.
> Similar issue occurs when the requester deletes shadow copies.
> 
> This patchset fix this issue by telling VSS that the volume is not
> supported by qemu-ga VSS provider when it is kicked by other requesters.
> 
> It also fixes wrong error handling around OpenEvent/CreateEvent WinAPI,
> which returns NULL instead of INVALID_HANDLE_VALUE on errors.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1036341
> 
> ---
> Tomoki Sekiyama (3):
>       qga: vss-win32: Use NULL as an invalid pointer for OpenEvent and CreateEvent
>       qga: vss-win32: Fix interference with snapshot creation by other VSS requesters
>       qga: vss-win32: Fix interference with snapshot deletion by other VSS request

Thanks, applied to qga tree:

  https://github.com/mdroth/qemu/commits/qga 

> 
> 
>  qga/vss-win32/provider.cpp  |   21 ++++++++++---
>  qga/vss-win32/requester.cpp |   70 ++++++++++++++++++++-----------------------
>  2 files changed, 49 insertions(+), 42 deletions(-)
> 
> -- 
> Tomoki Sekiyama