XLOG_HEADER_CYCLE_SIZE
#define XLOG_CYCLE_DATA_SIZE (XLOG_HEADER_CYCLE_SIZE / BBSIZE)
DIV_ROUND_UP(mp->m_logbsize, XLOG_HEADER_CYCLE_SIZE) - 1);
xheads = DIV_ROUND_UP(size, XLOG_HEADER_CYCLE_SIZE) - 1;
if (h_size > XLOG_HEADER_CYCLE_SIZE &&
hblks = DIV_ROUND_UP(h_size, XLOG_HEADER_CYCLE_SIZE);
h_size > XLOG_HEADER_CYCLE_SIZE)
return DIV_ROUND_UP(h_size, XLOG_HEADER_CYCLE_SIZE);