windows驱动中通过volume找partition的函数

下面是一个示例函数，它使用 IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS 和 IOCTL_DISK_GET_PARTITION_INFO_EX 控制码来获取指定卷的分区信息：

#include <windows.h>
#include <winioctl.h>
#include <stdio.h>

BOOL GetPartitionInfoByVolume(HANDLE hVolume, PULARGE_INTEGER pStartingOffset, PULARGE_INTEGER pPartitionSize, PWSTR pFileSystemName, DWORD cchFileSystemName)
{
    BOOL bRet = FALSE;
    DWORD dwBytesReturned;
    STORAGE_DEVICE_NUMBER sdn;
    VOLUME_DISK_EXTENTS vde;
    PARTITION_INFORMATION_EX pie;

    // 获取卷的设备号
    if (!DeviceIoControl(hVolume, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL, 0, &sdn, sizeof(sdn), &dwBytesReturned, NULL)) {
        printf("DeviceIoControl(IOCTL_STORAGE_GET_DEVICE_NUMBER) failed %d\n", GetLastError());
        goto Exit;
    }

    // 获取卷所在的磁盘编号和偏移量
    if (!DeviceIoControl(hVolume, IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS, NULL, 0, &vde, sizeof(vde), &dwBytesReturned, NULL)) {
        printf("DeviceIoControl(IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS) failed %d\n", GetLastError());
        goto Exit;
    }

    // 获取包含指定偏移量的分区信息
    HANDLE hDisk = NULL;
    WCHAR szDiskName[MAX_PATH];
    _snwprintf_s(szDiskName, MAX_PATH, L"\\\\.\\PhysicalDrive%d", sdn.DeviceNumber);
    hDisk = CreateFile(szDiskName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
    if (hDisk == INVALID_HANDLE_VALUE) {
        printf("CreateFile(%ws) failed %d\n", szDiskName, GetLastError());
        goto Exit;
    }

    LARGE_INTEGER liStartingOffset;
    liStartingOffset.QuadPart = pStartingOffset->QuadPart + vde.Extents[0].StartingOffset.QuadPart;
    if (!DeviceIoControl(hDisk, IOCTL_DISK_GET_PARTITION_INFO_EX, &liStartingOffset, sizeof(liStartingOffset), &pie, sizeof(pie), &dwBytesReturned, NULL)) {
        printf("DeviceIoControl(IOCTL_DISK_GET_PARTITION_INFO_EX) failed %d\n", GetLastError());
        goto Exit;
    }

    // 返回分区信息
    pPartitionSize->QuadPart = pie.PartitionLength.QuadPart;
    wcsncpy_s(pFileSystemName, cchFileSystemName, pie.FileSystemTypeName, cchFileSystemName - 1);
    bRet = TRUE;

Exit:
    if (hDisk != INVALID_HANDLE_VALUE) {
        CloseHandle(hDisk);
    }
    return bRet;
}

该函数需要传入一个已经打开的卷句柄和指向 ULARGE_INTEGER 类型的指针，以获取卷的起始偏移量和分区大小。函数还需要传入一个指向 WCHAR 类型的缓冲区和一个 DWORD 类型的值，以获取文件系统类型的字符串和字符串长度。如果函数调用成功，则返回 TRUE；否则返回 FALSE。