bpf_get_fsverity_digest
BTF_ID_FLAGS(func, bpf_get_fsverity_digest)
extern int bpf_get_fsverity_digest(struct file *file, struct bpf_dynptr *digest_ptr) __ksym;
ret = bpf_get_fsverity_digest(f, &digest_ptr);
ret = bpf_get_fsverity_digest(f, &digest_ptr);