很奇怪的问题，高手请进！

2006-07-18 06:35:57 198 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Linux中断子系统（二）—— 通用框架处理 1、数据结构分析 (1)中断描述符结构structirq＿desc： 1）打开CONFIG＿SPARSE＿IRQ宏（中断编号不连续），中断描述符以radix- tree来组织，用户在初始化时进行动态分配，然后再插入radix-tree中； 2）关闭CONFIG＿SPARSE＿IRQ宏（中断编号连续），中断描述符以数组的形式组织，并且已经分配好； 3）不管哪种形式，最终都可以通过linuxirq号来找到对应的中断描述符；（2）stru... 阅读详情

status = IoCallDriver(((PDEVICE_EXTENSION) DeviceObject->DeviceExtension)->FileSystemDeviceObject, Irp);
if(STATUS_PENDING == status)
{
NTSTATUS localStatus = KeWaitForSingleObject(&waitEvent, Executive, KernelMode, FALSE, NULL);
ASSERT(STATUS_SUCCESS == localStatus);
}

if (NT_SUCCESS(Irp->IoStatus.Status)&& IrpSp->FileObject !=NULL)
{
FILE_STANDARD_INFORMATION StdInfo;
if(QueryStdInfo(IrpSp->FileObject, ((PDEVICE_EXTENSION) DeviceObject->DeviceExtension)->FileSystemDeviceObject, &StdInfo))
bIsDir = StdInfo.Directory;
else
{
if(FilePath != NULL)
ExFreePool(FilePath);
IoCancelFileOpen(((PDEVICE_EXTENSION) DeviceObject->DeviceExtension)->FileSystemDeviceObject,IrpSp->FileObject);
goto EXIT_BLOCK_RES_IRP;
}
if ((FilePath!=NULL)&&(IrpSp->FileObject->FsContext!=NULL))
{
if (!AddHashEntry(FilePath,IrpSp->FileObject, bIsDir,ucObjAttr,ObjectType))
{
if(FilePath != NULL)
ExFreePool(FilePath);
IoCancelFileOpen(((PDEVICE_EXTENSION) DeviceObject->DeviceExtension)->FileSystemDeviceObject,IrpSp->FileObject);
goto EXIT_BLOCK_RES_IRP;
}
}
}
以上是create例程的代码，其中QueryStdInfo函数如下
BOOLEAN QueryStdInfo(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject,
PFILE_STANDARD_INFORMATION FileStdInfo)
{
IO_STATUS_BLOCK IoStatusBlock;
PIRP Irp;
PIO_STACK_LOCATION StackPtr;
KEVENT Event;
NTSTATUS Status;
KeInitializeEvent(&Event,SynchronizationEvent,FALSE);
if (FileStdInfo == NULL)
return FALSE;

Irp = IoAllocateIrp(DeviceObject->StackSize,
FALSE);
if (Irp == NULL)
{
return FALSE;
}

Irp->AssociatedIrp.SystemBuffer = FileStdInfo;
Irp->UserIosb = &IoStatusBlock;
Irp->UserEvent = &Event;
Irp->RequestorMode = KernelMode;
Irp->Tail.Overlay.Thread = PsGetCurrentThread();
Irp->Tail.Overlay.OriginalFileObject = FileObject;

StackPtr = IoGetNextIrpStackLocation(Irp);
StackPtr->MajorFunction = IRP_MJ_QUERY_INFORMATION;
StackPtr->MinorFunction = 0;
StackPtr->Flags = 0;
StackPtr->Control = 0;
StackPtr->DeviceObject = DeviceObject;
StackPtr->FileObject = FileObject;

StackPtr->Parameters.QueryFile.FileInformationClass =
FileStandardInformation;
StackPtr->Parameters.QueryFile.Length = sizeof(FILE_STANDARD_INFORMATION);

IoSetCompletionRoutine(Irp, QueryStdInfoComplete, 0, TRUE, TRUE, TRUE);
Status = IoCallDriver(DeviceObject,Irp);
KeWaitForSingleObject(&Event,Executive,KernelMode,FALSE,NULL);

return (NT_SUCCESS(IoStatusBlock.Status));
}

NTSTATUS
QueryStdInfoComplete(PDEVICE_OBJECT DeviceObject,
PIRP Irp,
PVOID Context)
//
// FilemonQueryFileNameComplete
//
// This routine is used to handle I/O completion for our self-generated
// IRP that is used to query a file's name.
//
{
//
// Copy the status information back into the "user" IOSB.
//
*Irp->UserIosb = Irp->IoStatus;

// Set the user event - wakes up the mainline code doing this.
//
KeSetEvent(Irp->UserEvent, 0, FALSE);

//
// Free the IRP now that we are done with it. //

IoFreeIrp(Irp);
//
// We return STATUS_MORE_PROCESSING_REQUIRED because this "magic" return value
// tells the I/O Manager that additional processing will be done by this driver
// to the IRP - in fact, it might (as it is in this case) already BE done - and
// the IRP cannot be completed.
//
return STATUS_MORE_PROCESSING_REQUIRED;
}

但是这样在访问网上共享文件时出现死锁，于是将代码该为
if(STATUS_PENDING == Status && FileObject->Flags & FO_SYNCHRONOUS_IO)

{
KeWaitForSingleObject(&Event,Executive,KernelMode,FALSE,NULL);
}
结果和clearcase冲突，已运行就蓝屏，搞不明白为什么，望高手指教。

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