BOOLEAN
CmpClaimGlobalQuota(
  IN  ULONG    Size
  );

Routine Description:

    If CmpGlobalQuotaUsed + Size >= CmpGlobalQuotaAllowed, return
    false.  Otherwise, increment CmpGlobalQuotaUsed, in effect claiming
    the requested GlobalQuota.

Arguments:

    Size - number of bytes of GlobalQuota caller wants to claim

Return Value:

    TRUE - Claim succeeded, and has been counted in Used GQ

    FALSE - Claim failed, nothing counted in GQ.