lbmRead
if ((rc = lbmRead(log, 1, &bpsuper)))
if ((rc = lbmRead(log, log->page, &bp)))
if ((rc = lbmRead(log, 1, &bpsuper)))
if ((rc = lbmRead(log, 1, &bpsuper)))
static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);