82 	struct buf *b_forw;		/* headed by d_tab of conf.c */  member
139 	struct buf *b_forw, *b_back;	/* queue of unit queues */  member
212 	ASSERT((bp)->b_forw != NULL); \
214 	(bp)->b_back->b_forw = (bp)->b_forw; \
215 	(bp)->b_forw->b_back = (bp)->b_back; \
216 	(bp)->b_forw = (bp)->b_back = NULL; \
219 	ASSERT((bp)->b_forw == NULL); \
221 	ASSERT((dp)->b_forw != NULL); \
223 	(bp)->b_forw = (dp)->b_forw; \
225 	(dp)->b_forw->b_back = (bp); \
226 	(dp)->b_forw = (bp); \
253 	struct	buf	*b_forw;	/* hash list forw pointer */  member
270 	struct	buf	*b_forw;	/* not used */  member