public static unsafe bool GetDeviceNumber(string path, out DeviceNumber result, out Exception failureReason)
{
result = new DeviceNumber();
failureReason = null;
var handle = Native.CreateFile(
path, NativeFileAccess.GenericRead, System.IO.FileShare.ReadWrite,
IntPtr.Zero, System.IO.FileMode.Open, NativeFileFlags.None, IntPtr.Zero
);
var error = Marshal.GetLastWin32Error();
if (error != 0)
{
failureReason = new Win32Exception(error);
return(false);
}
else if (handle.IsInvalid)
{
return(false);
}
try {
var devNumber = new Native.STORAGE_DEVICE_NUMBER();
Native.DeviceIoControl(
handle, Native.IOCTL_STORAGE_GET_DEVICE_NUMBER, devNumber
);
result = new DeviceNumber(devNumber.DeviceNumber, devNumber.PartitionNumber, devNumber.DeviceType);
return(true);
} catch (Win32Exception w32ex) {
// STORAGE_GET_DEVICE_NUMBER will fail for dynamic disks with ERROR_INCORRECT_FUNCTION,
// so we try VOLUME_GET_VOLUME_DISK_EXTENTS instead
if (w32ex.NativeErrorCode != Native.ERROR_INCORRECT_FUNCTION)
{
failureReason = w32ex;
return(false);
}
int extentSize = Marshal.SizeOf(typeof(Native.DISK_EXTENT));
int headerSize = Marshal.SizeOf(typeof(Native.VOLUME_DISK_EXTENTS_HEADER));
const int bufferSize = 64;
var buffer = new byte[headerSize + (extentSize * bufferSize)];
var header = new Native.VOLUME_DISK_EXTENTS_HEADER {
NumberOfDiskExtents = bufferSize
};
fixed(byte *pBuffer = buffer)
{
Marshal.StructureToPtr(header, new IntPtr(pBuffer), false);
Native.DeviceIoControl(
handle, Native.IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
new IntPtr(pBuffer), (UInt32)buffer.Length
);
Marshal.PtrToStructure(new IntPtr(pBuffer), header);
var pExtents = pBuffer + headerSize;
var extent = new Native.DISK_EXTENT();
if (header.NumberOfDiskExtents > 1)
{
throw new NotImplementedException("Volumes spread across multiple physical disks are not supported");
}
Marshal.PtrToStructure(new IntPtr(pExtents), extent);
result = new DeviceNumber(-1024, (int)extent.DiskNumber, -1024);
return(true);
}
} catch (Exception ex) {
failureReason = ex;
return(false);
} finally {
handle.Close();
}
}
public bool Equals(DeviceNumber rhs)
{
return (Device == rhs.Device) &&
(Partition == rhs.Partition) &&
(Type == rhs.Type);
}
public bool Equals(DeviceNumber rhs)
{
return((Device == rhs.Device) &&
(Partition == rhs.Partition) &&
(Type == rhs.Type));
}
public static unsafe bool GetDeviceNumber(string path, out DeviceNumber result, out Exception failureReason)
{
result = new DeviceNumber();
failureReason = null;
var handle = Native.CreateFile(
path, NativeFileAccess.GenericRead, System.IO.FileShare.ReadWrite,
IntPtr.Zero, System.IO.FileMode.Open, NativeFileFlags.None, IntPtr.Zero
);
var error = Marshal.GetLastWin32Error();
if (error != 0) {
failureReason = new Win32Exception(error);
return false;
} else if (handle.IsInvalid) {
return false;
}
try {
var devNumber = new Native.STORAGE_DEVICE_NUMBER();
Native.DeviceIoControl(
handle, Native.IOCTL_STORAGE_GET_DEVICE_NUMBER, devNumber
);
result = new DeviceNumber(devNumber.DeviceNumber, devNumber.PartitionNumber, devNumber.DeviceType);
return true;
} catch (Win32Exception w32ex) {
// STORAGE_GET_DEVICE_NUMBER will fail for dynamic disks with ERROR_INCORRECT_FUNCTION,
// so we try VOLUME_GET_VOLUME_DISK_EXTENTS instead
if (w32ex.NativeErrorCode != Native.ERROR_INCORRECT_FUNCTION) {
failureReason = w32ex;
return false;
}
int extentSize = Marshal.SizeOf(typeof(Native.DISK_EXTENT));
int headerSize = Marshal.SizeOf(typeof(Native.VOLUME_DISK_EXTENTS_HEADER));
const int bufferSize = 64;
var buffer = new byte[ headerSize + (extentSize * bufferSize) ];
var header = new Native.VOLUME_DISK_EXTENTS_HEADER {
NumberOfDiskExtents = bufferSize
};
fixed (byte* pBuffer = buffer) {
Marshal.StructureToPtr(header, new IntPtr(pBuffer), false);
Native.DeviceIoControl(
handle, Native.IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
new IntPtr(pBuffer), (UInt32)buffer.Length
);
Marshal.PtrToStructure(new IntPtr(pBuffer), header);
var pExtents = pBuffer + headerSize;
var extent = new Native.DISK_EXTENT();
if (header.NumberOfDiskExtents > 1)
throw new NotImplementedException("Volumes spread across multiple physical disks are not supported");
Marshal.PtrToStructure(new IntPtr(pExtents), extent);
result = new DeviceNumber(-1024, (int)extent.DiskNumber, -1024);
return true;
}
} catch (Exception ex) {
failureReason = ex;
return false;
} finally {
handle.Close();
}
}
