if ((pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q)) == PBF_DELWRI) { atomic_inc(&pb->pb_hold); pb->pb_flags |= PBF_ASYNC; pagebuf_delwri_queue(pb, 0); }
pagebuf_unlock(				/* unlock buffer		*/	xfs_buf_t		*pb)	/* buffer to unlock		*/{	PB_CLEAR_OWNER(pb);	up(&pb->pb_sema);	PB_TRACE(pb, "unlock", 0);}