VOP_BALLOC
error = VOP_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
error = VOP_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
if ((error = VOP_BALLOC(dvp, (off_t)dp->i_offset, DIRBLKSIZ,
error = VOP_BALLOC(vp, uio->uio_offset, xfersize,
error = VOP_BALLOC(tvp, 0LL, DIRBLKSIZ, cnp->cn_cred, B_CLRBUF, &bp);