why the fileSysDevice->vpb is NULL in filemon

NTFSD
1

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.

ÏíÓÃÊÀ½çÉÏ×î´óµÄµç×ÓÓʼþϵͳ¡ª MSN Hotmail¡£ http://www.hotmail.com

2

File systems do not normally fill in this field, since THEY do not need this additional information and linkage. You must find another way to locate the underlying device.

Regards,

Tony

Tony Mason
Consulting Partner
OSR Open Systems Resources, Inc.
http://www.osr.com

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of yansheng jushan
Sent: Monday, November 08, 2004 2:34 AM
To: ntfsd redirect
Subject: [ntfsd] why the fileSysDevice->vpb is NULL in filemon

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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3

In XP and later you can call IoGetRealDeviceObject. Look at the IFSKit samples they show you to use this API.

Neal Christiansen
Microsoft File System Filter Group Lead
This posting is provided “AS IS” with no warranties, and confers no rights

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of Tony Mason
Sent: Monday, November 08, 2004 2:41 AM
To: Windows File Systems Devs Interest List
Subject: RE: [ntfsd] why the fileSysDevice->vpb is NULL in filemon

File systems do not normally fill in this field, since THEY do not need this additional information and linkage. You must find another way to locate the underlying device.

Regards,

Tony

Tony Mason
Consulting Partner
OSR Open Systems Resources, Inc.
http://www.osr.com

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of yansheng jushan
Sent: Monday, November 08, 2004 2:34 AM
To: ntfsd redirect
Subject: [ntfsd] why the fileSysDevice->vpb is NULL in filemon

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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Questions? First check the IFS FAQ at https://www.osronline.com/article.cfm?id=17

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