cd9660_vfs_hash_cmp
error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino);