文件系统过滤驱动如何获得ZwCreateFile的参数CreationDisposition？

我的IRP_MJ_CREATE分派例程从何处获得ZwCreateFile的CreationDisposition?
它是在IO_STACK_LOCATION的Options里吗？

Irp->IoStatus
Pointer to an IO_STATUS_BLOCK structure that receives the final completion status and information about the requested operation. The file system sets the Information member of this structure to one of the following values:
FILE_CREATED

FILE_DOES_NOT_EXIST

FILE_EXISTS

FILE_OPENED

FILE_OVERWRITTEN

FILE_SUPERSEDED

你看错了。我想得到的是ZwCreateFile的参数CreateDisposition。而不是IRP完成状态。

CreateDisposition -> pIrpStack->Parameters.Create.Options >> 24

to vcmfc:
我发现IrpSp->Parameters.Create.Options 是如下说明的：
Specifies the options to be applied when creating or opening the file. These options are specified as a compatible combination of the following flags.
FILE_COMPLETE_IF_OPLOCKED

FILE_CREATE_TREE_CONNECTION

FILE_DELETE_ON_CLOSE

FILE_DIRECTORY_FILE

FILE_NO_EA_KNOWLEDGE

FILE_NO_INTERMEDIATE_BUFFERING

FILE_NON_DIRECTORY_FILE

FILE_OPEN_BY_FILE_ID

FILE_OPEN_FOR_BACKUP_INTENT

FILE_RANDOM_ACCESS

FILE_SEQUENTIAL_ONLY

FILE_SYNCHRONOUS_IO_ALERT

FILE_SYNCHRONOUS_IO_NONALERT

FILE_WRITE_THROUGH

而ZwCreateFile的CreationDisposition如下说明：
Specifies what to do, depending on whether the file already exists, as one of the following: CreateDispostion Values Meaning
FILE_SUPERSEDE If the file already exists, replace it with the given file. If it does not, create the given file.  
FILE_CREATE  If the file already exists, fail the request and do not create or open the given file. If it does not, create the given file.
FILE_OPEN  If the file already exists, open it instead of creating a new file. If it does not, fail the request and do not create a new file.
FILE_OPEN_IF If the file already exists, open it. If it does not, create the given file.
FILE_OVERWRITE If the file already exists, open it and overwrite it. If it does not, fail the request.
FILE_OVERWRITE_IF If the file already exists, open it and overwrite it. If it does not, create the given file.

好像你给的提示不太对啊。还有Options >> 24是不是有其他特殊的含义，如果是的，从哪儿可以找到？

这不是明说的。也就是高24位以上放CreateDisposition ,24位以下放你所说的option.明白吗？

谢谢vcmfc的解释。