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qga/win/vss: query VSS backup type

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Query VSS backup type number (DWORD) from QEMU Guest Agent VSS Provider registry key registry value VssOption

Translate the VSS backup type number (DWORD) into its VSS backup type (VSS_BACKUP_TYPE)

Returns the queried VSS backup type if the program encounters unexpected behaviors or values return default VSS backup type VSS_BT_FULL instead

Signed-off-by: Kfir Manor <kfir@daynix.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
This commit is contained in:
Kfir Manor 2023-02-09 10:50:03 +02:00 committed by Konstantin Kostiuk
parent fe67fc0eb4
commit 410542d4a2
2 changed files with 41 additions and 0 deletions
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38
qga/vss-win32/requester.cpp
View File

@ -23,6 +23,8 @@
/* Call QueryStatus every 10 ms while waiting for frozen event */
#define VSS_TIMEOUT_EVENT_MSEC 10
#define DEFAULT_VSS_BACKUP_TYPE VSS_BT_FULL
#define err_set(e, err, fmt, ...) \
((e)->error_setg_win32_wrapper((e)->errp, __FILE__, __LINE__, __func__, \
err, fmt, ## __VA_ARGS__))
@ -234,6 +236,42 @@ out:
}
}
DWORD get_reg_dword_value(HKEY baseKey, LPCSTR subKey, LPCSTR valueName,
DWORD defaultData)
{
DWORD regGetValueError;
DWORD dwordData;
DWORD dataSize = sizeof(DWORD);
regGetValueError = RegGetValue(baseKey, subKey, valueName, RRF_RT_DWORD,
NULL, &dwordData, &dataSize);
if (regGetValueError != ERROR_SUCCESS) {
return defaultData;
}
return dwordData;
}
bool is_valid_vss_backup_type(VSS_BACKUP_TYPE vssBT)
{
return (vssBT > VSS_BT_UNDEFINED && vssBT < VSS_BT_OTHER);
}
VSS_BACKUP_TYPE get_vss_backup_type(
VSS_BACKUP_TYPE defaultVssBT = DEFAULT_VSS_BACKUP_TYPE)
{
VSS_BACKUP_TYPE vssBackupType;
vssBackupType = static_cast<VSS_BACKUP_TYPE>(
get_reg_dword_value(HKEY_LOCAL_MACHINE,
QGA_PROVIDER_REGISTRY_ADDRESS,
"VssOption",
defaultVssBT));
if (!is_valid_vss_backup_type(vssBackupType)) {
return defaultVssBT;
}
return vssBackupType;
}
void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset)
{
COMPointer<IVssAsync> pAsync;

3
qga/vss-win32/vss-handles.h
View File

@ -6,6 +6,9 @@
#define QGA_PROVIDER_NAME "QEMU Guest Agent VSS Provider"
#define QGA_PROVIDER_LNAME L(QGA_PROVIDER_NAME)
#define QGA_PROVIDER_VERSION L(QEMU_VERSION)
#define QGA_PROVIDER_REGISTRY_ADDRESS "SYSTEM\\CurrentControlSet"\
"\\Services"\
"\\" QGA_PROVIDER_NAME
#define EVENT_NAME_FROZEN "Global\\QGAVSSEvent-frozen"
#define EVENT_NAME_THAW "Global\\QGAVSSEvent-thaw"