swap_newphysname
if (err = swap_newphysname(vp, off, &doff, &dlen, &pvp, &poff)) {
if (err = swap_newphysname(vp, off, &doff, &dlen,
err = swap_newphysname(vp, offset, &io_off, &io_len, &pvp, &pstart);
extern int swap_newphysname(struct vnode *vp, u_offset_t offset,