FSCTL_GET_RETRIEVAL_POINTERS

NTFSD
1

Wondered how I can get the handle of the file in the IRP_MJ_WRITE callback - so that I can call Device IoControl with FSCTL_GET_RETRIEVAL_POINTERS.

Thanks,

Ben.

2

Can you just call FltFsControlFile() to send down
FSCTL_GET_RETRIEVAL_POINTERS?

If you need a handle, then try ObOpenObjectByPointer().

On Thu, Dec 2, 2010 at 1:49 PM, wrote:

> Wondered how I can get the handle of the file in the IRP_MJ_WRITE callback
> - so that I can call Device IoControl with FSCTL_GET_RETRIEVAL_POINTERS.
>
> Thanks,
>
> Ben.
>
>
> —
> NTFSD is sponsored by OSR
>
> For our schedule of debugging and file system seminars
> (including our new fs mini-filter seminar) 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
>

3

No need for the handle
http://msdn.microsoft.com/en-us/library/ff545421(VS.85).aspx :slight_smile:

wrote in message news:xxxxx@ntfsd…

Wondered how I can get the handle of the file in the IRP_MJ_WRITE callback -
so that I can call Device IoControl with FSCTL_GET_RETRIEVAL_POINTERS.

Thanks,

Ben.

4

If OP wants to use ZwFsControlFile(), then he does need the file handle.

On Thu, Dec 2, 2010 at 2:38 PM, Lyndon J. Clarke > wrote:

> No need for the handle
> http://msdn.microsoft.com/en-us/library/ff545421(VS.85).aspx :slight_smile:
>
> wrote in message news:xxxxx@ntfsd…
>
>
> Wondered how I can get the handle of the file in the IRP_MJ_WRITE callback
> - so that I can call Device IoControl with FSCTL_GET_RETRIEVAL_POINTERS.
>
> Thanks,
>
> Ben.
>
>
> —
> NTFSD is sponsored by OSR
>
> For our schedule of debugging and file system seminars
> (including our new fs mini-filter seminar) 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
>

5

The OP should call FltFsControlFile and not ZwFsControlFile since they
mentioned they are in a callback and calling ZwFsControlFile would break
layering.

Thanks,

Alex.

6

Thanks Mate. Still find it weird that we’re not talking about load testing. Any kids? Are you living in Ed?

From: xxxxx@neverfailgroup.com
Subject: Re:[ntfsd] FSCTL_GET_RETRIEVAL_POINTERS
Date: Thu, 2 Dec 2010 19:38:40 +0000
To: xxxxx@lists.osr.com

No need for the handle
http://msdn.microsoft.com/en-us/library/ff545421(VS.85).aspx :slight_smile:

wrote in message news:xxxxx@ntfsd…

Wondered how I can get the handle of the file in the IRP_MJ_WRITE callback -
so that I can call Device IoControl with FSCTL_GET_RETRIEVAL_POINTERS.

Thanks,

Ben.

NTFSD is sponsored by OSR

For our schedule of debugging and file system seminars
(including our new fs mini-filter seminar) 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

7

Oops. Fallen foul of reply to all! Anyway, thanks everyone for the help.

8

For me, the real questions are “when?” (hoping not paging path) and “why?”
(postop path the result might already be stale).

wrote in message news:xxxxx@ntfsd…

Oops. Fallen foul of reply to all! Anyway, thanks everyone for the help.