Function buf_mapped

freebsd/sys/buf.h:517–522

extern caddr_t	unmapped_buf;	/* Data address for unmapped buffers. */

static inline int
buf_mapped(struct buf *bp)
{

	return (bp->b_data != unmapped_buf);
}

void	runningbufwakeup(struct buf *);
void	waitrunningbufspace(void);