111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <initguid.h>
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#include <virtdisk.h>
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#include "Storage.h"
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//
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// This sample demonstrates how to merge a differencing disk into its parent.
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//
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DWORD
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SampleMergeVirtualDisk(
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_In_ LPCWSTR LeafPath)
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{
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OPEN_VIRTUAL_DISK_PARAMETERS openParameters;
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MERGE_VIRTUAL_DISK_PARAMETERS mergeParameters;
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VIRTUAL_STORAGE_TYPE storageType;
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HANDLE vhdHandle;
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DWORD opStatus;
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vhdHandle = INVALID_HANDLE_VALUE;
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//
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// Specify UNKNOWN for both device and vendor so the system will use the
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// file extension to determine the correct VHD format.
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//
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storageType.DeviceId = VIRTUAL_STORAGE_TYPE_DEVICE_UNKNOWN;
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storageType.VendorId = VIRTUAL_STORAGE_TYPE_VENDOR_UNKNOWN;
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//
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// Open the VHD.
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//
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// VIRTUAL_DISK_ACCESS_NONE is the only acceptable access mask for V2 handle opens.
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// OPEN_VIRTUAL_DISK_FLAG_NONE bypasses any special handling of the open.
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//
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memset(&openParameters, 0, sizeof(openParameters));
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openParameters.Version = OPEN_VIRTUAL_DISK_VERSION_2;
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opStatus = OpenVirtualDisk(
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&storageType,
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LeafPath,
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VIRTUAL_DISK_ACCESS_NONE,
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OPEN_VIRTUAL_DISK_FLAG_NONE,
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&openParameters,
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&vhdHandle);
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if (opStatus != ERROR_SUCCESS)
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{
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goto Cleanup;
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}
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//
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// Perform the merge.
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//
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// MERGE_VIRTUAL_DISK_VERSION_2 allows merging of VHDs/VHDXs in use.
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// MERGE_VIRTUAL_DISK_FLAG_NONE is currently the only merge flag supported.
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//
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// DO NOT attempt to perform a live merge of a leaf (a)VHD or (a)VHDX of a VM as the
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// operation will not update the virtual machine configuration file.
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//
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memset(&mergeParameters, 0, sizeof(mergeParameters));
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mergeParameters.Version = MERGE_VIRTUAL_DISK_VERSION_2;
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// In this sample, the leaf is being merged so the source depth is 1.
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mergeParameters.Version2.MergeSourceDepth = 1;
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// In this sample, the leaf is being merged only to it's parent so the target depth is 2
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mergeParameters.Version2.MergeTargetDepth = 2;
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opStatus = MergeVirtualDisk(
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vhdHandle,
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MERGE_VIRTUAL_DISK_FLAG_NONE,
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&mergeParameters,
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NULL);
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if (opStatus != ERROR_SUCCESS)
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{
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goto Cleanup;
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}
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Cleanup:
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if (opStatus == ERROR_SUCCESS)
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{
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wprintf(L"success\n");
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}
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else
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{
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wprintf(L"error = %u\n", opStatus);
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}
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if (vhdHandle != INVALID_HANDLE_VALUE)
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{
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CloseHandle(vhdHandle);
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}
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return opStatus;
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}
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