Hi,
This patch series adds fsfreeze support for Windows qemu-guest-agent.
changes from v2:
- [06/11] Fix errors in Windows 7, reported by Li Baiqing
(see below for details).
changes from v1:
- Fix out-tree build by stop using recursive Makefile
- Added script to extract VSS SDK headers on POSIX systems using msitools
(thanks Paolo)
- Remove some unnecessary header files
v2: http://lists.gnu.org/archive/html/qemu-devel/2013-04/msg02518.html
* Description
In Windows, VSS (Volume Shadow Copy Service) provides a facility to
quiesce filesystems and applications before disk snapshots are taken.
This patch series implements "fsfreeze" command of qemu-ga using VSS.
* How to build & run qemu-ga with VSS support
- Download Microsoft VSS SDK from:
http://www.microsoft.com/en-us/download/details.aspx?id=23490
- Setup the SDK
scripts/extract-vsssdk-headers setup.exe (on POSIX-systems)
- Specify installed SDK directory to configure option as:
./configure -with-vss-sdk="path/to/VSS SDK" --cross-prefix=i686-w64-mingw32-
- make qemu-ga.exe
- Install qemu-ga.exe, qga/vss-win32-provider/qga-provider.{dll,tlb}, and
the other required mingw libraries into the same directory in guests
- Run `qemu-ga.exe -s install' and `net start qemu-ga' in the guests
* About errors in Windows 7 with patch v2
VSS requires to write to snapshot volumes just before making them read-only
at final commit phase. This feature is called `auto-recovery'
(See
http://msdn.microsoft.com/en-us/library/windows/desktop/aa384651(v=vs.85).aspx#base.vssgloss_auto_recoved_shadow_copy
for details).
Since qemu and libvirt don't have feature to handle writable snapshots,
this patchset just disables auto-recovery by specifying
VSS_VOLSNAP_ATTR_NO_AUTORECOVERY flag to SetContext.
Unfortunately, this flag seems unsupported in Windows 7 or earlier.
It tries to look up the snapshot volumes to write and fails in
VSS_E_OBJECT_NOT_FOUND.
For fundamental resolution we need a framework for guests to query snapshots
and to mount them as writable snapshots, but we just ignore the error in
this patchset.
Any feedback are appliciated.
---
Tomoki Sekiyama (11):
configure: Support configuring c++ compiler
Fix errors and warnings while compiling with c++ compilier
Add a script to extract VSS SDK headers on POSIX system
qemu-ga: Add an configure option to specify path to Windows VSS SDK
qemu-ga: Add Windows VSS provider to quiesce applications on fsfreeze
qemu-ga: Add Windows VSS requester to quisce applications and filesystems
qemu-ga: call Windows VSS requester in fsfreeze command handler
qemu-ga: install Windows VSS provider on `qemu-ga -s install'
qemu-ga: Add VSS provider .tlb file in the repository
QMP/qemu-ga-client: make timeout longer for guest-fsfreeze-freeze command
QMP/qmp.py: set locale for exceptions to display non-ascii messages
correctly
.gitignore | 1
Makefile | 3
Makefile.objs | 2
QMP/qemu-ga-client | 4
QMP/qmp.py | 4
configure | 59 ++++
hmp.c | 2
hw/pci/pci.c | 2
qga/Makefile.objs | 7
qga/commands-win32.c | 74 ++++-
qga/main.c | 41 +++
qga/vss-win32-provider.h | 26 ++
qga/vss-win32-provider/Makefile.objs | 25 ++
qga/vss-win32-provider/install.cpp | 494 +++++++++++++++++++++++++++++++
qga/vss-win32-provider/provider.cpp | 474 ++++++++++++++++++++++++++++++
qga/vss-win32-provider/qga-provider.def | 10 +
qga/vss-win32-provider/qga-provider.idl | 20 +
qga/vss-win32-provider/qga-provider.tlb | Bin
qga/vss-win32-requester.cpp | 404 +++++++++++++++++++++++++
qga/vss-win32-requester.h | 31 ++
qga/vss-win32.h | 85 +++++
rules.mak | 9 +
scripts/extract-vsssdk-headers | 25 ++
scripts/qapi.py | 9 +
24 files changed, 1796 insertions(+), 15 deletions(-)
create mode 100644 qga/vss-win32-provider.h
create mode 100644 qga/vss-win32-provider/Makefile.objs
create mode 100644 qga/vss-win32-provider/install.cpp
create mode 100644 qga/vss-win32-provider/provider.cpp
create mode 100644 qga/vss-win32-provider/qga-provider.def
create mode 100644 qga/vss-win32-provider/qga-provider.idl
create mode 100644 qga/vss-win32-provider/qga-provider.tlb
create mode 100644 qga/vss-win32-requester.cpp
create mode 100644 qga/vss-win32-requester.h
create mode 100644 qga/vss-win32.h
create mode 100755 scripts/extract-vsssdk-headers
