MAX_READAHEAD
static int sscom_readahead[MAX_READAHEAD];
if (sscom_readaheadcount < MAX_READAHEAD &&
static int plcom_readahead[MAX_READAHEAD];
if (plcom_readaheadcount < MAX_READAHEAD
static int com_readahead[MAX_READAHEAD];
if (with_readahead && com_readaheadcount < MAX_READAHEAD