MRxZeroExtend routine

Article
03/14/2023

The MRxZeroExtend routine is called by RDBSS to request that a network mini-redirector truncate the contents of a file system object.

Syntax

PMRX_CALLDOWN MRxZeroExtend;

NTSTATUS MRxZeroExtend(
  _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

MRxZeroExtend returns STATUS_SUCCESS on success or an appropriate NTSTATUS value, such as the following:

Return code	Description
STATUS_NOT_IMPLEMENTED	This routine is not implemented.

Remarks

MRxZeroExtend is called as part of cleanup operations if the file object was not marked for deletion and the file object is not a paging file. MRxZeroExtend is called to ensure that the portion between the valid data length and the file size is zero-extended. After calling MRxZeroExtend, RDBSS sets the Header.ValidDataLength.QuadPart member of the structure of an FCB structure equal to the Header.FileSize.QuadPart member of the FCB structure.

A call to MRxZeroExtend will be followed by a call to MRxCleanupFobx as part of the cleanup operation.

RDBSS ignores the return value from MRxZeroExtend.

Requirements

Target platform	Desktop
Header	Mrx.h (include Mrx.h)