bvp 131 miscfs/specfs/spec_vnops.c struct vnode *bvp; bvp 163 miscfs/specfs/spec_vnops.c vfinddev(bdev, VBLK, &bvp) && bvp 164 miscfs/specfs/spec_vnops.c bvp->v_usecount > 0 && bvp 165 miscfs/specfs/spec_vnops.c (error = vfs_mountedon(bvp)))