6dd098cb1e
This commit constructs the super_vbmeta image to eliminate the need of adding /vbmeta_system and/or /vbmeta_vendor when AVB chain partition is used with Android Dynamic Partition. See BOARD_AVB_VBMETA_SYSTEM under the link: https://android.googlesource.com/platform/external/avb/#build-system-integration The structure of super_vbmeta : | VBMeta Table | (fixed-length 2KiB) | Backup VBMeta Table | (fixed-length 2KiB) | VBMeta Images | (fixed-length 64KiB each) The structure of VBMeta Table : | Super VBMeta Header | (fixed-length 128B) | VBMeta Descriptors | (variable-length) The VBMeta Table records the slot number of each vbmeta image within the /super_vbmeta partition. Bug: 137054296 Test: m libvbmeta_test Test: ./out/host/linux-x86/nativetest/libvbmeta_test/libvbmeta_test Change-Id: I01aeadd850750ae87d9125484c1b1f570bb84756
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/*
|
|
* Copyright (C) 2019 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.
|
|
*/
|
|
|
|
#include "utility.h"
|
|
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "super_vbmeta_format.h"
|
|
|
|
using android::base::ErrnoError;
|
|
using android::base::Error;
|
|
using android::base::Result;
|
|
|
|
namespace android {
|
|
namespace fs_mgr {
|
|
|
|
Result<uint64_t> GetFileSize(int fd) {
|
|
struct stat sb;
|
|
if (fstat(fd, &sb) == -1) {
|
|
return ErrnoError() << "Couldn't get the file size";
|
|
}
|
|
return sb.st_size;
|
|
}
|
|
|
|
uint64_t IndexOffset(const uint8_t vbmeta_index) {
|
|
/* There are primary and backup vbmeta table in super_vbmeta,
|
|
so SUPER_VBMETA_TABLE_MAX_SIZE is counted twice. */
|
|
return 2 * SUPER_VBMETA_TABLE_MAX_SIZE + vbmeta_index * VBMETA_IMAGE_MAX_SIZE;
|
|
}
|
|
|
|
} // namespace fs_mgr
|
|
} // namespace android
|