fuse_operations
const struct fuse_operations *ops, unused size_t size,
fuse_setup(int argc, char **argv, const struct fuse_operations *ops,
fuse_main(int argc, char **argv, const struct fuse_operations *ops, void *data)
int fuse_main(int, char **, const struct fuse_operations *, void *);
const struct fuse_operations *, size_t, void *);
struct fuse *fuse_setup(int, char **, const struct fuse_operations *,
struct fuse_operations op;