Quick question on PreCreate callback

NTFSD
1

Under what conditions is the following true?
Data->Iopb->TargetFileObject->FileName.Buffer == NULL

What should I do in user-space to get such request?

Thanks in advance
Vinod

2

Try FindFirstFile(“.”)

This will probably use ->RelatedFileObject of the current dir and empty FileName.

–
Maxim S. Shatskih
Windows DDK MVP
xxxxx@storagecraft.com
http://www.storagecraft.com

wrote in message news:xxxxx@ntfsd…
> Under what conditions is the following true?
> Data->Iopb->TargetFileObject->FileName.Buffer == NULL
>
> What should I do in user-space to get such request?
>
> Thanks in advance
> Vinod
>

3

Could be volume open? This is an alternate to FO_VOLUME_OPEN flag if I
remember correctly. Try to open a handle to the volume.

Regards,
Ayush Gupta
Software Consultant & Owner,
AI Consulting

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@msn.com
Sent: Friday, February 25, 2011 9:25 AM
To: Windows File Systems Devs Interest List
Subject: [ntfsd] Quick question on PreCreate callback

Under what conditions is the following true?
Data->Iopb->TargetFileObject->FileName.Buffer == NULL

What should I do in user-space to get such request?

Thanks in advance
Vinod

NTFSD is sponsored by OSR

For our schedule of debugging and file system seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer

4

Thanks Maxim and Ayush for your responses.

Ayush - you’re absolutely right in that when I open a volume I see FileName.Buffer as NULL with FO_VOLUME_OPEN flag set.

Maxim - I tried FindFirstFile(“.”) after SetCurrentDirectory to no avail.

Is there a way to get Data->Iopb->TargetFileObject->FileName.Buffer as NULL in cases other than volume open?

Thanks again,
Vinod

5

I’ve also tried relative opens to no avail. This is on 64-bit Win 7.