// ntifs.h

NTSTATUS FsRtlQueryCachedVdl(
  [in]  PFILE_OBJECT FileObject,
  [out] PLONGLONG    Vdl
);
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Windows Driver Kit DDI reference (nf-ntifs-fsrtlquerycachedvdl)

FsRtlQueryCachedVdl function

Description

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

Parameters

`FileObject` [in]

The file object to retrieve the cached VDL for.

`Vdl` [out]

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.

View the official Windows Driver Kit DDI reference