Passing down the Read IRP - newbie doubts...

NTFSD
1

Hi!
A few newbie doubts. :slight_smile:
I have a bit of trouble in handling a read IRP. I
am using pinned access for handling the volume
metadata. I try to map a range of bytes and I get a
read IRP (from the Cache manager).
In the handler, instead of using an associated IRP
or the next stack location and sending down the IRP, I
create a new IRP (IoBuildSynchronousFsdRequest) and
despatch the IRP to the target (disk) driver. I wait
for it to be completed (on an event) but it never does
get completed.

Questions…

  1. Can anyone tell me why?
  2. Is it wrong to create a new IRP and pass it
    down?
  3. Rajeev Nagar talks about using associated IRPs
    or the next stack location. He suggests setting up a
    completion routine and doing the post processing
    there. Can’t I wait for the completion on an event???
  4. From WinDebug, can I find out the IRQ level at
    which my code is executing?
    Thanks in advance!
    Manoj

=====

Manoj Paul Joseph,
Master of Computer Applications (final year student),
School of Computer Science and Engineering,
Anna University,
Chennai (Madras),
India.

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2

Hi Max,
How do I signal the event in the completion routine
if it is executing at APC_LEVEL? I get a bug-check
which I should. How do I handle this issue?
Manoj

— “Maxim S. Shatskih”
wrote: > > create a new IRP
(IoBuildSynchronousFsdRequest)
> and
> > despatch the IRP to the target (disk) driver. I
> wait
> > for it to be completed (on an event) but it never
> does
> > get completed.
>
> Page faults (including Cc ones) are handled on
> APC_LEVEL, so, IopCompleteRequest is blocked.
> Use IoAllocateIrp instead of
> IoBuildSynchronousFsdRequest and signal the event in
> the completion routine before calling IoFreeIrp.
> Return STATUS_MORE_PROCESSING_REQUIRED from the
> completion routine.
>
> Max

=====
-----------------------------------
Manoj Paul Joseph,
Master of Computer Applications (final year student),
School of Computer Science and Engineering,
Anna University,
Chennai (Madras),
India.

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3

You can signal an event up to dispatch level. Make sure you’re really signalling an event.

-----Original Message-----
From: Manoj Paul Joseph [mailto:xxxxx@yahoo.com]
Sent: Tuesday, February 12, 2002 2:13 AM
To: File Systems Developers
Subject: [ntfsd] Re: Passing down the Read IRP - newbie doubts…

Hi Max,
How do I signal the event in the completion routine
if it is executing at APC_LEVEL? I get a bug-check
which I should. How do I handle this issue?
Manoj

— “Maxim S. Shatskih”
wrote: > > create a new IRP
(IoBuildSynchronousFsdRequest)
> and
> > despatch the IRP to the target (disk) driver. I
> wait
> > for it to be completed (on an event) but it never
> does
> > get completed.
>
> Page faults (including Cc ones) are handled on
> APC_LEVEL, so, IopCompleteRequest is blocked.
> Use IoAllocateIrp instead of
> IoBuildSynchronousFsdRequest and signal the event in
> the completion routine before calling IoFreeIrp.
> Return STATUS_MORE_PROCESSING_REQUIRED from the
> completion routine.
>
> Max

=====
-----------------------------------
Manoj Paul Joseph,
Master of Computer Applications (final year student),
School of Computer Science and Engineering,
Anna University,
Chennai (Madras),
India.

________________________________________________________________________
Looking for a job? Visit Yahoo! India Careers
Visit http://in.careers.yahoo.com

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