/// <summary>
/// Windows will flush all cached data to the volume before locking it.
/// Note: we can only lock a dynamic volume if the disk is online and the volume is operational.
/// </summary>
/// <returns>True if a new lock has been obtained</returns>
public static bool ExclusiveLock(Guid windowsVolumeGuid, FileAccess fileAccess)
{
bool newAllocation;
// Windows Vista / 7: Valid handle cannot be obtained for a dynamic volume using ShareMode.ReadWrite.
// The FSCTL_LOCK_VOLUME documentation demands ShareMode.ReadWrite, but ShareMode.None or ShareMode.Write will work too.
SafeFileHandle handle = VolumeHandlePool.ObtainHandle(windowsVolumeGuid, fileAccess, ShareMode.None, out newAllocation);
if (newAllocation)
{
if (!handle.IsInvalid)
{
bool success = VolumeControl.LockVolume(handle);
if (!success)
{
VolumeHandlePool.ReleaseHandle(windowsVolumeGuid);
}
return(success);
}
else
{
VolumeHandlePool.ReleaseHandle(windowsVolumeGuid);
return(false);
}
}
else
{
return(false);
}
}
/// <summary>
/// Note that the volume will be remounted again on first access.
/// </summary>
public static bool DismountVolume(Guid windowsVolumeGuid)
{
bool releaseHandle;
SafeFileHandle handle = VolumeHandlePool.ObtainHandle(windowsVolumeGuid, FileAccess.ReadWrite, ShareMode.ReadWrite, out releaseHandle);
bool success = false;
if (!handle.IsInvalid)
{
success = VolumeControl.DismountVolume(handle);
}
if (releaseHandle) // new allocation
{
VolumeHandlePool.ReleaseHandle(windowsVolumeGuid);
}
return(success);
}
/// <summary>
/// Volume should be locked at this point for this call to have any effect
/// </summary>
/// <returns></returns>
public bool AllowExtendedIO()
{
bool releaseHandle;
SafeFileHandle handle = VolumeHandlePool.ObtainHandle(m_volumeGuid, FileAccess.ReadWrite, ShareMode.None, out releaseHandle);
if (!handle.IsInvalid)
{
bool result = VolumeControl.AllowExtendedIO(handle);
if (releaseHandle)
{
VolumeHandlePool.ReleaseHandle(m_volumeGuid);
}
return(result);
}
else
{
// we always release invalid handle
VolumeHandlePool.ReleaseHandle(m_volumeGuid);
return(false);
}
}
public static List <string> GetMountPoints(Guid windowsVolumeGuid)
{
return(VolumeControl.GetVolumeMountPoints(windowsVolumeGuid));
}
/// <summary>
/// If Windows Automount is turned off, then partitions on new disks are not mounted. (but can be locked).
/// Failed dynamic volumes are not mounted as well. (and can't be locked).
/// Note: A volume can have 0 mount points and still be mounted and access by Windows.
/// Note: The NTFS file system treats a locked volume as a dismounted volume.
/// </summary>
public static bool IsMounted(Guid windowsVolumeGuid)
{
return(VolumeControl.IsVolumeMounted(windowsVolumeGuid));
}
