Export (0) Print
Expand All

MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY] routine

The MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY] routine is called by RDBSS to issue a request to the network mini-redirector for a directory change notification operation.

Syntax


PMRX_CALLDOWN MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY];

NTSTATUS MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY](
  _Inout_  PRX_CONTEXT RxContext
)
{ ... }

Parameters

RxContext [in, out]

A pointer to the RX_CONTEXT structure. This parameter contains the IRP that is requesting the operation.

Return value

MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY] returns STATUS_SUCCESS on success or an appropriate NTSTATUS value, such as one of the following:

Return codeDescription
STATUS_FILE_CLOSED

The FCB structure was acquired, but the associated SRV_OPEN structure has been closed.

STATUS_INSUFFICIENT_RESOURCES

There were insufficient resources to complete the request.

STATUS_INVALID_DEVICE_REQUEST

An invalid device request was specified.

STATUS_INVALID_PARAMETER

An invalid parameter was specified in RxContext.

STATUS_NOT_IMPLEMENTED

This routine is not implemented.

STATUS_NOT_SUPPORTED

The specified request is not supported by the network mini-redirector.

 

Remarks

RDBSS calls MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY] in response to receiving an IRP_MJ_DIRECTORY_CONTROL request.

Before calling MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY], RDBSS modifies the following members in the RX_CONTEXT structure pointed to by the RxContext parameter:

The LowIoContext.Operation member is set to LOWIO_OP_NOTIFY_CHANGE_DIRECTORY.

The LowIoContext.ResourceThreadId member is set to the thread of the process that initiated the operation in RDBSS.

The LowIoContext.ParamsFor.NotifyChangeDirectory.WatchTree member is set to TRUE if the IrpSp->Flags has the SL_WATCH_TREE bit set.

The LowIoContext.ParamsFor.NotifyChangeDirectory.CompletionFilter member is set to the value of IrpSp->Parameters.NotifyDirectory.CompletionFilter.

The LowIoContext.ParamsFor.NotifyChangeDirectory.NotificationBufferLength member is set to the value of IrpSp->Parameters.NotifyDirectory.Length.

The LowIoContext.ParamsFor.NotifyChangeDirectory.pNotificationBuffer member is set to the value returned by calling MmGetSystemAddressForMdlSafe passing in the Irp->MdlAddress and NormalPagePriority. The user buffer also is probed and locked for write access.

A directory change notification operation is normally implemented by a network mini-redirector as an asynchronous operation because it can take considerable time. The operation usually consists of sending a network request to the remote server requesting change notification. The response is obtained when the desired change is affected on the server. This is an example of an operation for which the network mini-redirector may need to register a unique context value for handling cancellations initiated locally.

While the MRxLowIOSubmit[LOWIO_OP_NOTIFY_CHANGE_DIRECTORY] routine is processing, the LowIoContext.ResourceThreadId member of RX_CONTEXT is guaranteed to indicate the thread of the process that initiated the operation in RDBSS. The LowIoContext.ResourceThreadId member can be used to release the FCB structure on behalf of another thread. When an asynchronous routine completes, the FCB structure that was acquired from the initial thread can be released. The FCB structure can be released by calling RxReleaseFcbResourceForThreadInMRx.

Requirements

Header

Mrx.h (include Mrx.h)

See also

MRxLowIOSubmit[LOWIO_OP_EXCLUSIVELOCK]
MRxLowIOSubmit[LOWIO_OP_FSCTL]
MRxLowIOSubmit[LOWIO_OP_IOCTL]
MRxLowIOSubmit[LOWIO_OP_READ]
MRxLowIOSubmit[LOWIO_OP_SHAREDLOCK]
MRxLowIOSubmit[LOWIO_OP_UNLOCK]
MRxLowIOSubmit[LOWIO_OP_UNLOCK_MULTIPLE]
MRxLowIOSubmit[LOWIO_OP_WRITE]
RxReleaseFcbResourceForThreadInMRx

 

 

Send comments about this topic to Microsoft

Show:
© 2014 Microsoft