VOID
CdLookupLastFileDirent(
  IN  PIRP_CONTEXT IrpContext,
  IN  PFCB Fcb,
  IN  PFILE_ENUM_CONTEXT FileContext
  );

Routine Description:

    This routine is called when we've found the matching initial dirent for
    a file.  Now we want to find all of the dirents for a file as well as
    compute the running total for the file size.

    We also go out to the system use area and check whether this is an
    XA sector.  In that case we will compute the real file size.

    The dirent in the initial compound dirent has been updated from the
    raw dirent when this routine is called.

Arguments:

    Fcb - Directory containing the entries for the file.

    FileContext - Enumeration context for this search.  It currently points
        to the first dirent of the file and the in-memory dirent has been
        updated.

Return Value:

    None.  This routine may raise STATUS_FILE_CORRUPT.