alternative data streams and fcb-s

NTFSD
1

I seem to see that when an alternate data stream for a file say
c:\temp\hilly:place is open and at same time the file itself c:\temp\hilly
is open, these two end up using different fcb-s. I had - perhaps a propos
nothing - expected the two to use the same fcb since its a file and two
streams. Does anyone know if its right (or wrong) for there two different
fcb-s here? It’d be good to understand what is going on here. Thanks,
Lyndon.

2

Alternate streams do use different Fcbs. Think about how caching is
initialized and where the SOP’s are located. Alternate streams use two
different cache maps.

Pete

Peter Scott
xxxxx@KernelDrivers.com
www.KernelDrivers.com

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Lyndon J. Clarke
Sent: Thursday, February 27, 2003 9:59 AM
To: File Systems Developers
Subject: [ntfsd] alternative data streams and fcb-s

I seem to see that when an alternate data stream for a file say
c:\temp\hilly:place is open and at same time the file itself
c:\temp\hilly
is open, these two end up using different fcb-s. I had - perhaps a
propos
nothing - expected the two to use the same fcb since its a file and two
streams. Does anyone know if its right (or wrong) for there two
different
fcb-s here? It’d be good to understand what is going on here. Thanks,
Lyndon.

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3

Hi Peter. Thanks. I understand that now. Kind regards, Lyndon.

4

FCB describes the on-disk data stream - so, 2 FCBs for 2 streams.

Max

----- Original Message -----
From: “Lyndon J. Clarke”
To: “File Systems Developers”
Sent: Thursday, February 27, 2003 7:58 PM
Subject: [ntfsd] alternative data streams and fcb-s

> I seem to see that when an alternate data stream for a file say
> c:\temp\hilly:place is open and at same time the file itself
c:\temp\hilly
> is open, these two end up using different fcb-s. I had - perhaps a
propos
> nothing - expected the two to use the same fcb since its a file and
two
> streams. Does anyone know if its right (or wrong) for there two
different
> fcb-s here? It’d be good to understand what is going on here.
Thanks,
> Lyndon.
>
> —
> You are currently subscribed to ntfsd as: xxxxx@storagecraft.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>

5

Are these technically called SCB’s? Does anyone know?

Matt

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Maxim S. Shatskih
Sent: Thursday, February 27, 2003 3:49 PM
To: File Systems Developers
Subject: [ntfsd] Re: alternative data streams and fcb-s

FCB describes the on-disk data stream - so, 2 FCBs for 2 streams.

Max

----- Original Message -----
From: “Lyndon J. Clarke”
To: “File Systems Developers”
Sent: Thursday, February 27, 2003 7:58 PM
Subject: [ntfsd] alternative data streams and fcb-s

> I seem to see that when an alternate data stream for a file say
> c:\temp\hilly:place is open and at same time the file itself
c:\temp\hilly
> is open, these two end up using different fcb-s. I had - perhaps a
propos
> nothing - expected the two to use the same fcb since its a file and
two
> streams. Does anyone know if its right (or wrong) for there two
different
> fcb-s here? It’d be good to understand what is going on here.
Thanks,
> Lyndon.
>
> —
> You are currently subscribed to ntfsd as: xxxxx@storagecraft.com To
> unsubscribe send a blank email to xxxxx@lists.osr.com
>

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