Re:[ntfsd] why the fileSysDevice->vpb  is NULL  in f

NTFSD
1

I dont know who allocate the vpb?
I have read the source of disk.sys, but have no clue who is responsible for
"create them and free them "? Is it “Io Mananger” created them when we set
device-type as FILE_DEVICE_DISK and free them opaquely when we call
IoDeleteDevice?

in filemon’s HookDriver function

it first create the file for example the path “C:”
after this it obtain the fileobject throw the file handle
then use
fileSysDevice = IoGetRelatedDeviceObject( fileObject );

I want to obtain the fileSysDevice->vpb->RealDevice to see the
RealDevice->characteristic;
but it failed because the vpb get from the fileSysDevice is NULL;

why fileSysDevice->vpb is NULL.

thanks.

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