FsRtlQueryCachedVdl function (ntifs.h)

The current valid data length (VDL) for a cached file is retrieved with the FsRtlQueryCachedVdl routine.

Syntax

NTSTATUS FsRtlQueryCachedVdl(
  [in]  PFILE_OBJECT FileObject,
  [out] PLONGLONG    Vdl
);

Parameters

[in] FileObject

The file object to retrieve the cached VDL for.

[out] Vdl

A pointer to a caller supplied value which receives the VDL.

Return value

FsRtlQueryCachedVdl returns STATUS_SUCCESS if the cached VDL is obtained successfully for the FileObject specified. Otherwise, another appropriate NTSTATUS value is returned.

Remarks

The FsRtlQueryCachedVdl routine will return the VDL for a full span file region. This is a region beginning at an offset of 0 and having a length of MAXLONGLONG.

Requirements