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RE: IoBuildDeviceIoControlRequest() and IoCallDriver(-)

OSR_Community_UserOSR_Community_User Member Posts: 110,217
My first thought is that your request gets stuck in ScsiPort's queue, or the
queue gets stalled. To confirm where the IRP is use the !irp command in KD
to see where it is.

Do the requests that don't complete get sent down to the drive? (Use a Scsi
bus analyzer if you have one). i.e. check if your command was sent,
followed by a request sense command. During request sense commands ScsiPort
may stall its queues.

Have you looked at any debug prints that may be coming form ScsiPort?

Are you building IRP_MJ_SCSI or IRP_MJ_DEVICE_IO_CONTROL requests? I
believe you should be using IRP_MJ_DEVICE_IO_CONTROL with

Good luck,


-----Original Message-----
From: Sajeev [mailto:[email protected]]
Sent: Thursday, June 15, 2000 12:23 PM
To: NT Developers Interest List
Subject: [ntdev] RE: IoBuildDeviceIoControlRequest() and IoCallDriver()

I'm using IOCTL_SCSI_EXEC_IN as the control code for the
IoBuildDeviceIoControlRequest() and using direct CDB command for reading. I
doubt whether I can use IoBuildSynchronousFsdRequest() since, my filter sits
between disk.sys and scsiport.


----- Original Message -----
From: Jamey Kirby
To: NT Developers Interest List
Sent: Thursday, June 15, 2000 11:53 AM
Subject: [ntdev] RE: IoBuildDeviceIoControlRequest() and IoCallDriver()

Are you using IoBuildDeviceIoControlRequest() to build IRP_MJ_READ and
IRP_MJ_WRITE requests? If so, this is not correct, you shouold use
IoBuildSynchronousFsdRequest() or IoBuildAsynchronousFsdRequest().


-----Original Message-----
From: [email protected]
[ mailto:[email protected]
]On Behalf Of Sajeev
Sent: Thursday, June 15, 2000 11:53 AM
To: NT Developers Interest List
Subject: [ntdev] IoBuildDeviceIoControlRequest() and IoCallDriver()

Hi All,
On getting a IOCTL from a win32 application, in my filter driver, I'm using
IoBuildDeviceIoControlRequest() and IoCallDriver() to send block Read/Write
commands(special purpose) to the underlying SCSI Port driver. I'm supplying
a event to IoBuildDeviceIoControlRequest() and also waiting on it, if
IoCallDriver() returns with STATUS_PENDING. But very rarely, the Read/Write
I send to the underlying driver never returns(the event never gets

Can anybody tell me what might be the problem.

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