Method sync

fdbrpc/AsyncFileEncrypted.actor.cpp:127–132

	}

	ACTOR static Future<Void> sync(Reference<AsyncFileEncrypted> self) {
		ASSERT(self->mode == AsyncFileEncrypted::Mode::APPEND_ONLY);
		wait(self->writeLastBlockToFile());
		wait(self->file->sync());
		return Void();
	}

	ACTOR static Future<Void> zeroRange(AsyncFileEncrypted* self, int64_t offset, int64_t length) {
		ASSERT(self->mode == AsyncFileEncrypted::Mode::APPEND_ONLY);