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![Chen Hanxiao](/assets/img/avatar_default.png)
This patch add support for freeze specified fs. The valid mountpoints list member are [1]: The path of a mounted folder, for example, Y:\MountX\ A drive letter, for example, D:\ A volume GUID path of the form \\?\Volume{GUID}\, where GUID identifies the volume A UNC path that specifies a remote file share, for example, \\Clusterx\Share1\ [1] https://docs.microsoft.com/en-us/windows/desktop/api/vsbackup/nf-vsbackup-ivssbackupcomponents-addtosnapshotset Cc: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Chen Hanxiao <chenhanxiao@gmail.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
/*
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* QEMU Guest Agent VSS utility functions
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*
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* Copyright Hitachi Data Systems Corp. 2013
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*
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* Authors:
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* Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <windows.h>
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "guest-agent-core.h"
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#include "vss-win32.h"
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#include "vss-win32/requester.h"
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#define QGA_VSS_DLL "qga-vss.dll"
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static HMODULE provider_lib;
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/* Call a function in qga-vss.dll with the specified name */
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static HRESULT call_vss_provider_func(const char *func_name)
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{
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FARPROC WINAPI func;
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g_assert(provider_lib);
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func = GetProcAddress(provider_lib, func_name);
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if (!func) {
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char *msg;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(char *)&msg, 0, NULL);
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fprintf(stderr, "failed to load %s from %s: %s",
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func_name, QGA_VSS_DLL, msg);
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LocalFree(msg);
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return E_FAIL;
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}
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return func();
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}
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/* Check whether this OS version supports VSS providers */
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static bool vss_check_os_version(void)
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{
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OSVERSIONINFO OSver;
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OSver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
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GetVersionEx(&OSver);
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if ((OSver.dwMajorVersion == 5 && OSver.dwMinorVersion >= 2) ||
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OSver.dwMajorVersion > 5) {
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BOOL wow64 = false;
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#ifndef _WIN64
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/* Provider doesn't work under WOW64 (32bit agent on 64bit OS) */
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if (!IsWow64Process(GetCurrentProcess(), &wow64)) {
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fprintf(stderr, "failed to IsWow64Process (Error: %lx\n)\n",
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GetLastError());
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return false;
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}
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if (wow64) {
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warn_report("Running under WOW64");
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}
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#endif
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return !wow64;
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}
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return false;
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}
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/* Load qga-vss.dll */
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bool vss_init(bool init_requester)
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{
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if (!vss_check_os_version()) {
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/* Do nothing if OS doesn't support providers. */
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fprintf(stderr, "VSS provider is not supported in this OS version: "
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"fsfreeze is disabled.\n");
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return false;
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}
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provider_lib = LoadLibraryA(QGA_VSS_DLL);
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if (!provider_lib) {
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char *msg;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(char *)&msg, 0, NULL);
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fprintf(stderr, "failed to load %s: %sfsfreeze is disabled\n",
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QGA_VSS_DLL, msg);
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LocalFree(msg);
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return false;
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}
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if (init_requester) {
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HRESULT hr = call_vss_provider_func("requester_init");
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if (FAILED(hr)) {
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fprintf(stderr, "fsfreeze is disabled.\n");
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vss_deinit(false);
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return false;
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}
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}
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return true;
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}
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/* Unload qga-provider.dll */
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void vss_deinit(bool deinit_requester)
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{
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if (deinit_requester) {
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call_vss_provider_func("requester_deinit");
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}
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FreeLibrary(provider_lib);
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provider_lib = NULL;
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}
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bool vss_initialized(void)
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{
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return !!provider_lib;
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}
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int ga_install_vss_provider(void)
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{
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HRESULT hr;
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if (!vss_init(false)) {
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fprintf(stderr, "Installation of VSS provider is skipped. "
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"fsfreeze will be disabled.\n");
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return 0;
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}
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hr = call_vss_provider_func("COMRegister");
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vss_deinit(false);
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return SUCCEEDED(hr) ? 0 : EXIT_FAILURE;
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}
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void ga_uninstall_vss_provider(void)
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{
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if (!vss_init(false)) {
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fprintf(stderr, "Removal of VSS provider is skipped.\n");
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return;
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}
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call_vss_provider_func("COMUnregister");
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vss_deinit(false);
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}
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/* Call VSS requester and freeze/thaw filesystems and applications */
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void qga_vss_fsfreeze(int *nr_volume, bool freeze,
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strList *mountpoints, Error **errp)
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{
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const char *func_name = freeze ? "requester_freeze" : "requester_thaw";
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QGAVSSRequesterFunc func;
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ErrorSet errset = {
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.error_setg_win32_wrapper = error_setg_win32_internal,
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.errp = errp,
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};
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g_assert(errp); /* requester.cpp requires it */
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func = (QGAVSSRequesterFunc)GetProcAddress(provider_lib, func_name);
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if (!func) {
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error_setg_win32(errp, GetLastError(), "failed to load %s from %s",
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func_name, QGA_VSS_DLL);
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return;
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}
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func(nr_volume, mountpoints, &errset);
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}
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