Error in File Create Device Object

NTFSD
1

Hi,
I have a filter driver to monitor file open and close operation to keep
track of what files are opened on user dekstop. I start this driver from my
service. It works fine and all machines we have used but there is one
strange problem on one of our customer machine. I am getting following error
“Cannot create file when that file exists”. Looks like there is Device Name
conflict. There must be some other driver which is running on customer
machine and having same name as our driver. I want my customer to run
“Device tree” utility from OSR but they have warning that this might crash
system So I wanted to know if “Device Tree” causes any permanent changes to
machine and if it crashes machine then we can just restart machine and
everything will be normal.

Also, how to solve this Device Name conflict problem. I do not have much
experience writting drivers. I just created a simple driver based on FileSpy
sample in IFS Kit.

Thanks in advance
Ashish

2

> Also, how to solve this Device Name conflict problem. I do not have much

experience writting drivers. I just created a simple driver based on
FileSpy
sample in IFS Kit.

Who exactly reports this error ? An application ? or your
service creating the filter ?

L.

3

I’ve never heard of a case where a Device Tree crash did anything more
than cause a reboot on the system - its generally an issue because
Device Tree works by doing the prohibited - it sends plug and play IRPs
to the devices (that’s how it discovers the configuration of the
machine.) Since this is all in-memory, it shouldn’t cause anything
persistent.

But if the machine is already unstable, it might not come back up from a
crash - regardless of what causes the crash.

Regards,

Tony

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

Looking forward to seeing you at the next OSR File Systems class in
Boston, MA April 18-21, 2006 (note new date - MS scheduled plugfest the
same week again.)

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Ashish
Sent: Thursday, February 23, 2006 4:08 AM
To: ntfsd redirect
Subject: [ntfsd] Error in File Create Device Object

Hi,
I have a filter driver to monitor file open and close operation to keep
track of what files are opened on user dekstop. I start this driver from
my
service. It works fine and all machines we have used but there is one
strange problem on one of our customer machine. I am getting following
error
“Cannot create file when that file exists”. Looks like there is Device
Name
conflict. There must be some other driver which is running on customer
machine and having same name as our driver. I want my customer to run
“Device tree” utility from OSR but they have warning that this might
crash
system So I wanted to know if “Device Tree” causes any permanent changes
to
machine and if it crashes machine then we can just restart machine and
everything will be normal.

Also, how to solve this Device Name conflict problem. I do not have much
experience writting drivers. I just created a simple driver based on
FileSpy
sample in IFS Kit.

Thanks in advance
Ashish

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

You are currently subscribed to ntfsd as: xxxxx@osr.com
To unsubscribe send a blank email to xxxxx@lists.osr.com

4

The error is from Service Control Manager…
----- Original Message -----
From: “Ladislav Zezula”
To: “Windows File Systems Devs Interest List”
Sent: Thursday, February 23, 2006 3:15 PM
Subject: Re: [ntfsd] Error in File Create Device Object

> > Also, how to solve this Device Name conflict problem. I do not have much
> > experience writting drivers. I just created a simple driver based on
> > FileSpy
> > sample in IFS Kit.
>
> Who exactly reports this error ? An application ? or your
> service creating the filter ?
>
> L.
>
>
>
> —
> Questions? First check the IFS FAQ at
https://www.osronline.com/article.cfm?id=17
>
> You are currently subscribed to ntfsd as: xxxxx@elasticworkspace.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>
>
> –
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.375 / Virus Database: 268.0.0/266 - Release Date: 2/21/2006
>
>