size_utils.h

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/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <stdint.h>
 
namespace cuttlefish {
 
// Keep the full disk size a multiple of 64k, for crosvm's virtio_blk driver
constexpr int DISK_SIZE_SHIFT = 16;
 
// Keep all partitions 4k aligned, for host performance reasons
constexpr int PARTITION_SIZE_SHIFT = 12;
 
// Returns the smallest multiple of 2^align_log greater than or equal to val.
constexpr uint64_t AlignToPowerOf2(uint64_t val, uint8_t align_log) {
  uint64_t align = 1ULL << align_log;
  return ((val + (align - 1)) / align) * align;
}
 
}  // namespace cuttlefish