start              42 kernel/log.c     int start;
start              60 kernel/log.c     log.start = sb->logstart;
start              75 kernel/log.c       struct buf *lbuf = bread(log.dev, log.start+tail+1); // read log block
start              90 kernel/log.c     struct buf *buf = bread(log.dev, log.start);
start             106 kernel/log.c     struct buf *buf = bread(log.dev, log.start);
start             185 kernel/log.c       struct buf *to = bread(log.dev, log.start+tail+1); // log block