fuse_copy_init
fuse_copy_init(&cs, true, to);
fuse_copy_init(&cs, true, NULL);
fuse_copy_init(&cs, false, from);
fuse_copy_init(&cs, false, NULL);
fuse_copy_init(&cs, false, &iter);
fuse_copy_init(&cs, true, &iter);
void fuse_copy_init(struct fuse_copy_state *cs, bool write,