fastIO dispatch table in filter driver

NTFSD
1

What are the side-effects in the case where one sets the fastIO dispatch
table in a driver object for a filter driver to NULL? By doing so,
would that cause the system to blue screen under certain conditions?

thanks

2

Hi Joseph,

Let me try to answer this question…from my experience, see the posting
just previous to this posting, I was getting the “KMODE_EXCEPTION”
bluescreen when I did not fill in the FastIo dispatch entries. Then I
filled in the FastIo entries from the SFilter example and the bluescreen is
gone. Hope this helps. But I would still be interested to know why?
-Steven Cook

“Vossen, Joseph (ISS Atlanta)” wrote in message
news:xxxxx@ntfsd…
What are the side-effects in the case where one sets the fastIO dispatch
table in a driver object for a filter driver to NULL? By doing so,
would that cause the system to blue screen under certain conditions?

thanks

3

At a minimum a filter must support every fast I/O function supported by
the underlying driver. In addition it MUST support detach - otherwise
IoDeleteDevice (the function that CALLS your detach entry point) will
bug check.

Regards,

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 AlphaGrey
Sent: Friday, October 22, 2004 7:39 PM
To: ntfsd redirect
Subject: Re:[ntfsd] fastIO dispatch table in filter driver

Hi Joseph,

Let me try to answer this question…from my experience, see the posting
just previous to this posting, I was getting the “KMODE_EXCEPTION”
bluescreen when I did not fill in the FastIo dispatch entries. Then I
filled in the FastIo entries from the SFilter example and the bluescreen
is
gone. Hope this helps. But I would still be interested to know why?
-Steven Cook

“Vossen, Joseph (ISS Atlanta)” wrote in message
news:xxxxx@ntfsd…
What are the side-effects in the case where one sets the fastIO dispatch
table in a driver object for a filter driver to NULL? By doing so,
would that cause the system to blue screen under certain conditions?

thanks

—
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