How to get disk signature on disk release in win2k3 cluster

Hi,

Is there a way to obtain disk signature at the time of disk release in
win2k3 cluster. Basically at the time of disk acquire, the upper layer
(clusadmin) passes disk signature. In the return path, FileObject-
>FsContext is populated by cluster driver.

However on disk release, the upper layer (clusadmin) passes down only
the FileObject containing valid FsContext (the same that was populated
by cluster driver in Disk Acquire). Upper layer does not pass Disk
signature in Disk release. Can we get disk signature in such a case,
may be by sending some ioctl to cluster driver for the specific
FileObject->FsContext.

Thanks,
Sunil