构造读写IRP_游戏技术文章

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游戏技术文章: 构造读写IRP
时间：2016-12-29 13:20:10  作者：棋牌资源网  来源：棋牌资源网  查看：7847  评论：0
内容摘要：DDK示例中的代码。NTSTATUSFltReadSectors( IN PDEVICE_OBJECT DeviceObject, OUT PVOID Buffer, IN ULONG Length,  IN LO...
DDK示例中的代码。

NTSTATUS
FltReadSectors(
IN PDEVICE_OBJECT
DeviceObject,
OUT PVOID Buffer,
IN ULONG Length,

IN LONGLONG ByteOffset,
IN BOOLEAN Wait
)

{

PIRP irp;
IO_STATUS_BLOCK iosb;
KEVENT event;

NTSTATUS status;

irp =
IoBuildAsynchronousFsdRequest(IRP_MJ_READ, DeviceObject,
Buffer,
Length, (PLARGE_INTEGER) &ByteOffset, &iosb);
if (!irp)
{
return STATUS_INSUFFICIENT_RESOURCES;
}

if
(Wait) {
KeInitializeEvent(&event, NotificationEvent,
FALSE);
IoSetCompletionRoutine(irp,
FltReadWriteSectorsCompletion,
&event, TRUE, TRUE,
TRUE);

status = IoCallDriver(DeviceObject, irp);
if
(STATUS_PENDING == status) {
KeWaitForSingleObject(&event,
Executive, KernelMode, FALSE, NULL);
status = iosb.Status;

}
} else {
IoSetCompletionRoutine(irp,
FltReadWriteSectorsCompletion,
NULL, TRUE, TRUE, TRUE);

irp->UserIosb = NULL;
status = IoCallDriver(DeviceObject,
irp);
}

return
status;
}

NTSTATUS
FltWriteSectors(
IN PDEVICE_OBJECT
DeviceObject,
IN PVOID Buffer,
IN ULONG Length,
IN
LONGLONG ByteOffset,
IN BOOLEAN Wait
)

{

PIRP irp;
IO_STATUS_BLOCK iosb;
KEVENT event;

NTSTATUS status;

irp =
IoBuildAsynchronousFsdRequest(IRP_MJ_WRITE, DeviceObject,
Buffer,
Length, (PLARGE_INTEGER) &ByteOffset, &iosb);
if (!irp)
{
return STATUS_INSUFFICIENT_RESOURCES;
}

if
(Wait) {
KeInitializeEvent(&event, NotificationEvent,
FALSE);
IoSetCompletionRoutine(irp,
FltReadWriteSectorsCompletion,
&event, TRUE, TRUE,
TRUE);

status = IoCallDriver(DeviceObject, irp);
if
(STATUS_PENDING == status) {
KeWaitForSingleObject(&event,
Executive, KernelMode, FALSE, NULL);
status = iosb.Status;

}
} else {
IoSetCompletionRoutine(irp,
FltReadWriteSectorsCompletion,
NULL, TRUE, TRUE, TRUE);

irp->UserIosb = NULL;
status = IoCallDriver(DeviceObject,
irp);
}

return
status;
}

NTSTATUS
FltReadWriteSectorsCompletion(
IN
PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID
Context
)

{
PMDL mdl;


UNREFERENCED_PARAMETER(DeviceObject);

//
// Free
resources
//

if (Irp->AssociatedIrp.SystemBuffer
&& (Irp->Flags & IRP_DEALLOCATE_BUFFER)) {

ExFreePool(Irp->AssociatedIrp.SystemBuffer);
}

while
(Irp->MdlAddress) {
mdl = Irp->MdlAddress;

Irp->MdlAddress = mdl->Next;
MmUnlockPages(mdl);

IoFreeMdl(mdl);
}

if (Irp->PendingReturned &&
(Context != NULL)) {
*Irp->UserIosb = Irp->IoStatus;

KeSetEvent((PKEVENT) Context, IO_DISK_INCREMENT, FALSE);

}

IoFreeIrp(Irp);

//
// Don't touch irp
any more
//
return STATUS_MORE_PROCESSING_REQUIRED;
}
标签：构造读写IRP
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