B_CALL
ccb->ccb_buf.b_flags = B_PHYS | B_CALL;
if (ISSET(bp->b_flags, B_CALL)) { /* if necessary, call out */
CLR(bp->b_flags, B_CALL); /* but note callout done */
SET(bp->b_flags, B_READ | B_ASYNC | B_CALL);
nbp->vb_buf.b_flags = bp->b_flags | B_CALL;
bp->b_flags |= B_CALL | (curproc == uvm.pagedaemon_proc ?