fdfs
struct fdfs *fs;
fs = (struct fdfs *)vp->v_fs;
--((struct fdfs *)vp->v_fs)->fd_bufi;
((struct fdfs *)vp->v_fs)->fd_bufi = 0;
struct fdfs *fs = (struct fdfs *)vp->v_fs;
struct fdfs *fs;
fs = (struct fdfs *)vp->v_fs;
struct fdfs *fs;
fs = (struct fdfs *)bp->b_vp->v_fs;
struct fdfs *fs;