Reading a sector in AddDevice

NTFSD
1

Hi,

I am writing a disk filter driver. I want to read a sector from hard
disk using this code in AddDevice function. Is this possible?

read_Irp = IoBuildSynchronousFsdRequest(
IRP_MJ_READ,
deviceExtension->TargetDeviceObject,
pBuffer,
BufferSize,
&ByteOffset,
&event,
&iosb
);

if ( NULL == read_Irp )
{
DbgBreakPoint();
return STATUS_INSUFFICIENT_RESOURCES;
}

// send the irp down the device stack
status = IoCallDriver( deviceExtension->TargetDeviceObject, read_Irp);

2

> I am writing a disk filter driver. I want to read a sector from hard

disk using this code in AddDevice function. Is this possible?

No.

Post-MN_START_DEVICE is the first place where you can submit read IRPs.

–
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com

3

AddDevice is too early. The OS is just building up the stack for this
device and you cannot send non pnp requests before IRP_MN_START_DEVICE.
Read/write is even later.
Regards
Else

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| Subject: [ntfsd] Reading a sector in AddDevice |
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Hi,

I am writing a disk filter driver. I want to read a sector from hard
disk using this code in AddDevice function. Is this possible?

read_Irp = IoBuildSynchronousFsdRequest(
IRP_MJ_READ,
deviceExtension->TargetDeviceObject,
pBuffer,
BufferSize,
&ByteOffset,
&event,
&iosb
);

if ( NULL == read_Irp )
{
DbgBreakPoint();
return STATUS_INSUFFICIENT_RESOURCES;
}

// send the irp down the device stack
status = IoCallDriver( deviceExtension->TargetDeviceObject, read_Irp);

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4

ok, thank’s