VOP_BMAP
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
if (VOP_BMAP(vp, blkno + 1, NULL, &sblkno, &maxra))
return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp));
int VOP_BMAP(struct vnode *, daddr_t, struct vnode **, daddr_t *, int *);
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
error = VOP_BMAP(sdp->swd_vp, byteoff / sdp->swd_bsize,