nvnode_pager_setsize
nvnode_pager_setsize(vp, length, blksize, boff);
nvnode_pager_setsize(vp, nlength, nblksize, nboff);
void nvnode_pager_setsize (struct vnode *vp, off_t length,
nvnode_pager_setsize(vp, np->n_size, XXX);
nvnode_pager_setsize(ovp, 0, fs->fs_bsize, 0);
nvnode_pager_setsize(dvp, dp->i_offset + DIRBLKSIZ,
nvnode_pager_setsize(vp, nsize,
nvnode_pager_setsize(tvp, DIRBLKSIZ, DIRBLKSIZ, -1);