p9fs_node_cmp
int p9fs_node_cmp(struct vnode *vp, void *arg);
error = vfs_hash_get(mp, hash, flags, td, &vp, p9fs_node_cmp,
p9fs_node_cmp, &fid->qid);
if ((p9fs_node_cmp(vp, &newfid->qid) == 0) &&