Re: Issue multiple reads during IRP_MJ_READ!

NTFSD
1

Were either of you successful in generating multiple
reads during an IRP_MJ_READ? I find that I must do the
same thing and have hit the STATUS_MULTIPLE_FAULT_VIOLATION
error Sin Lam was seeing when creating own IRP_MJ_READ.

Thanks,
Doug

On 10/19/01, ““Alexey Logachyov” ” wrote:
> I never did it myself but I think I will have to. If you are successful with
> this please let me know.
>
> ----- Original Message -----
> From: “Tan Sin Lam”
> To: “File Systems Developers”
> Sent: Friday, October 19, 2001 5:23 AM
> Subject: [ntfsd] Re: Issue multiple reads during IRP_MJ_READ!
>
>
> > Hi Alexey,
> > Thanks for your reply. I did try to send my own read IRP to the lower
> file
> > system but I got STATUS_MULTIPLE_FAULT_VIOLATION and STATUS_FILE_CLOSED. I
> > use the same FileObject from the original IRP. Have you generated your own
> > IRP for the read request before? Any sample would be useful. Thanks!
> >
> > Regards,
> > Sin Lam
> >
> > > If you use ZwReadFile you’re gonna catch your own read requests (in
> other
> > > words you’re gonna have reentrncy problems). So, you might want to
> create
> > > IRPs from scratch.
> > >
> > > ----- Original Message -----
> > > From: “Tan Sin Lam”
> > > To: “File Systems Developers”
> > > Sent: Thursday, October 18, 2001 1:59 PM
> > > Subject: [ntfsd] Issue multiple reads during IRP_MJ_READ!
> > >
> > >
> > > > I am developing a filter driver for encryption / decryption. I would
> > like
> > > to
> > > > send a few read requests to the lower file system during the
> > IRP_MJ_READ.
> > > > For example, send a request to read some header information, and then
> > send
> > > > another request to read actual data with some offset. After the
> multiple
> > > > reads completed, I will fill the original read IRP myself. What is the
> > > right
> > > > approach to do this: building my own IRP to the lower file system or
> use
> > > the
> > > > ZwReadFile routine?
> > > >
> > > > For the first case, I always get the status
> > > STATUS_MULTIPLE_FAULT_VIOLATION
> > > > and STATUS_FILE_CLOSED. I use the original file object in my newly
> > > allocated
> > > > IRP.
> > > >
> > > > For the second case, if I have a way to avoid reentrancy problem, I
> > still
> > > > need to call ZwCreateFile before I can call ZwReadFile because it
> > requires
> > > a
> > > > file handle. Can I call ZwCreateFile in the IRP_MJ_READ operation
> using
> > a
> > > > system thread? I find out that if I do that, my driver is deadlock
> when
> > it
> > > > is attached on top of a virus scan driver. If I disable the virus scan
> > > > driver, there is no deadlock.
> > > >
> > > > I appreciate someone can point me to the right direction. Thank you.
> > > >
> > > > Sin-Lam
> > > >
> > > >
> > > > —
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> > >
> > >
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> > >
> >
> >
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>
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2

I found out that the STATUS_MULTIPLE_FAULT_VIOLATION violation was due to
the FileObject from paging io read, i.e. If I use the FileObject from
application read (without paging flag set), the read is successful, which it
gets data from the Cache Manager.

Rgds,
Sin Lam

----- Original Message -----
From: “Doug Fetter”
To: “File Systems Developers”
Sent: Monday, January 14, 2002 5:17 PM
Subject: [ntfsd] Re: Issue multiple reads during IRP_MJ_READ!

> Were either of you successful in generating multiple
> reads during an IRP_MJ_READ? I find that I must do the
> same thing and have hit the STATUS_MULTIPLE_FAULT_VIOLATION
> error Sin Lam was seeing when creating own IRP_MJ_READ.
>
> Thanks,
> Doug
>
>
> On 10/19/01, ““Alexey Logachyov” ” wrote:
> > I never did it myself but I think I will have to. If you are successful
with
> > this please let me know.
> >
> > ----- Original Message -----
> > From: “Tan Sin Lam”
> > To: “File Systems Developers”
> > Sent: Friday, October 19, 2001 5:23 AM
> > Subject: [ntfsd] Re: Issue multiple reads during IRP_MJ_READ!
> >
> >
> > > Hi Alexey,
> > > Thanks for your reply. I did try to send my own read IRP to the
lower
> > file
> > > system but I got STATUS_MULTIPLE_FAULT_VIOLATION and
STATUS_FILE_CLOSED. I
> > > use the same FileObject from the original IRP. Have you generated your
own
> > > IRP for the read request before? Any sample would be useful. Thanks!
> > >
> > > Regards,
> > > Sin Lam
> > >
> > > > If you use ZwReadFile you’re gonna catch your own read requests (in
> > other
> > > > words you’re gonna have reentrncy problems). So, you might want to
> > create
> > > > IRPs from scratch.
> > > >
> > > > ----- Original Message -----
> > > > From: “Tan Sin Lam”
> > > > To: “File Systems Developers”
> > > > Sent: Thursday, October 18, 2001 1:59 PM
> > > > Subject: [ntfsd] Issue multiple reads during IRP_MJ_READ!
> > > >
> > > >
> > > > > I am developing a filter driver for encryption / decryption. I
would
> > > like
> > > > to
> > > > > send a few read requests to the lower file system during the
> > > IRP_MJ_READ.
> > > > > For example, send a request to read some header information, and
then
> > > send
> > > > > another request to read actual data with some offset. After the
> > multiple
> > > > > reads completed, I will fill the original read IRP myself. What is
the
> > > > right
> > > > > approach to do this: building my own IRP to the lower file system
or
> > use
> > > > the
> > > > > ZwReadFile routine?
> > > > >
> > > > > For the first case, I always get the status
> > > > STATUS_MULTIPLE_FAULT_VIOLATION
> > > > > and STATUS_FILE_CLOSED. I use the original file object in my newly
> > > > allocated
> > > > > IRP.
> > > > >
> > > > > For the second case, if I have a way to avoid reentrancy problem,
I
> > > still
> > > > > need to call ZwCreateFile before I can call ZwReadFile because it
> > > requires
> > > > a
> > > > > file handle. Can I call ZwCreateFile in the IRP_MJ_READ operation
> > using
> > > a
> > > > > system thread? I find out that if I do that, my driver is deadlock
> > when
> > > it
> > > > > is attached on top of a virus scan driver. If I disable the virus
scan
> > > > > driver, there is no deadlock.
> > > > >
> > > > > I appreciate someone can point me to the right direction. Thank
you.
> > > > >
> > > > > Sin-Lam
> > > > >
> > > > >
> > > > > —
> > > > > You are currently subscribed to ntfsd as: xxxxx@vba.com.by
> > > > > To unsubscribe send a blank email to
leave-ntfsd-$subst(‘Recip.MemberIDChar’)@lists.osr.com
> > > >
> > > >
> > > > —
> > > > You are currently subscribed to ntfsd as: xxxxx@krdl.org.sg
> > > > To unsubscribe send a blank email to leave-ntfsd-$subst(‘Recip.MemberIDChar’)@lists.osr.com
> > > >
> > >
> > >
> > > —
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> > > To unsubscribe send a blank email to leave-ntfsd-$subst(‘Recip.MemberIDChar’)@lists.osr.com
> >
> >
> > —
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>
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