RE: How to get the Volume Allocation bitmap in File system Filter Dri ver

NTFSD
1

It is not that much memory; if your volumes are that large, you should
have lots of memory installed.

I have a filter that keeps three volume bitmaps in non-paged pool and I
have never had a resource problem.

Jamey

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Avinash Kumar
Sent: Monday, April 14, 2003 4:56 PM
To: File Systems Developers
Subject: [ntfsd] How to get the Volume Allocation bitmap in File system
Filter Dri ver

Hi
In my filter driver I need to get the pointer to the Bitmap of cluster
allocation by file systems. One way is to get it by using
FSCTL_GET_VOLUME_BITMAP but for a large volume it will eat up a lot of
space
to keep the volume bitmap which will be in Non Paged Memory which I
don’t
want to use. Is there any way to get the pointer to the Used Clusters
Bitmap
that file system keeps?

Thanks in advance.

Avi

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2

Get it to the paged memory, and then make your own structure - an AVL
tree of (start, len) ranges - to describe the same thing.

You will get major memory footprint decrease.

Max

----- Original Message -----
From: “Avinash Kumar”
To: “File Systems Developers”
Sent: Tuesday, April 15, 2003 3:56 AM
Subject: [ntfsd] How to get the Volume Allocation bitmap in File
system Filter Dri ver

> Hi
> In my filter driver I need to get the pointer to the Bitmap of
cluster
> allocation by file systems. One way is to get it by using
> FSCTL_GET_VOLUME_BITMAP but for a large volume it will eat up a lot
of space
> to keep the volume bitmap which will be in Non Paged Memory which I
don’t
> want to use. Is there any way to get the pointer to the Used
Clusters Bitmap
> that file system keeps?
>
> Thanks in advance.
>
> Avi
>
>
>
>
> —
> You are currently subscribed to ntfsd as: xxxxx@storagecraft.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com