构造IRP

高手进来看看，帮帮忙，构造IRP 的问题。

文件系统识别器的代码，我现在想调用这个函数从磁盘读取数据，读取不出来啊。

NTSTATUS
FsRecReadSectors(IN PDEVICE_OBJECT DeviceObject,
IN ULONG DiskSector,
IN ULONG SectorCount,
IN ULONG SectorSize,
IN OUT PUCHAR Buffer)
{
PIO_STACK_LOCATION Stack;
IO_STATUS_BLOCK IoStatus;
LARGE_INTEGER Offset;
ULONG BlockSize;
PKEVENT Event;
PIRP Irp;
NTSTATUS Status;

Event = ExAllocatePool(NonPagedPool, sizeof(KEVENT));
if (Event == NULL)
{
return(STATUS_INSUFFICIENT_RESOURCES);
}

KeInitializeEvent(Event,
NotificationEvent,
FALSE);

Offset.QuadPart = (LONGLONG)DiskSector * (LONGLONG)SectorSize;
BlockSize = SectorCount * SectorSize;

KdPrint( ("FsrecReadSectors(DeviceObject %x, DiskSector %d, Buffer %x)\n",
DeviceObject, DiskSector, Buffer) );
KdPrint( ("Offset %I64x BlockSize %ld\n",
Offset.QuadPart, BlockSize) );

KdPrint( ("Building synchronous FSD Request...\n") );
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
BlockSize,
&Offset,
Event,
&IoStatus);
if (Irp == NULL)
{
KdPrint( ("IoBuildSynchronousFsdRequest failed\n") );
ExFreePool(Event);
return(STATUS_INSUFFICIENT_RESOURCES);
}

KdPrint( ("Calling IO Driver... with irp %x\n", Irp) );
//Status = IoCallDriver(DeviceObject, Irp);
Status = Read_CallHookIRP( DeviceObject, Irp );
if (Status == STATUS_PENDING)
{
KdPrint( ("Operation pending\n") );
KeWaitForSingleObject(Event, Suspended, KernelMode, FALSE, NULL);
Status = IoStatus.Status;
}

ExFreePool(Event);

return(STATUS_SUCCESS);
}

为什么我调用这个函数总是读不出数据，但返回的结果都是成功的。这个函数对（PDEVICE_OBJECT DeviceObject）有什么要求啊，请高手讲解讲解啊。

顶一下

对这个不甚了解，函数结束return值就是STATUS_SUCCESS，如果改成IoStatus.Status也是成功吗？还是Read_CallHookIRP函数有问题，没得到数据？你自己仔细调试一下……我自己构造IRP经常死锁，汗……

谢谢关注啊。Read_CallHookIRP 等同于 IoCallDriver 就是 HOOK  \\Driver\\Disk 驱动的IRP_MJ_READ 函数，避免重入。