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//
// Copyright (C) 2023 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 "super_flash_helper.h"
#include <android-base/logging.h>
#include "util.h"
using android::base::borrowed_fd;
using android::base::unique_fd;
using android::fs_mgr::SuperImageExtent;
SuperFlashHelper::SuperFlashHelper(const ImageSource& source) : source_(source) {}
bool SuperFlashHelper::Open(borrowed_fd fd) {
if (!builder_.Open(fd)) {
LOG(VERBOSE) << "device does not support optimized super flashing";
return false;
}
base_metadata_ = builder_.Export();
return !!base_metadata_;
}
bool SuperFlashHelper::IncludeInSuper(const std::string& partition) {
return should_flash_in_userspace(*base_metadata_.get(), partition);
}
bool SuperFlashHelper::AddPartition(const std::string& partition, const std::string& image_name,
bool optional) {
if (!IncludeInSuper(partition)) {
return true;
}
auto iter = image_fds_.find(image_name);
if (iter == image_fds_.end()) {
unique_fd fd = source_.OpenFile(image_name);
if (fd < 0) {
if (!optional) {
LOG(VERBOSE) << "could not find partition image: " << image_name;
return false;
}
return true;
}
if (is_sparse_file(fd)) {
LOG(VERBOSE) << "cannot optimize dynamic partitions with sparse images";
return false;
}
iter = image_fds_.emplace(image_name, std::move(fd)).first;
}
if (!builder_.AddPartition(partition, image_name, get_file_size(iter->second))) {
return false;
}
will_flash_.emplace(partition);
return true;
}
SparsePtr SuperFlashHelper::GetSparseLayout() {
// Cache extents since the sparse ptr depends on data pointers.
if (extents_.empty()) {
extents_ = builder_.GetImageLayout();
if (extents_.empty()) {
LOG(VERBOSE) << "device does not support optimized super flashing";
return {nullptr, nullptr};
}
}
unsigned int block_size = base_metadata_->geometry.logical_block_size;
int64_t flashed_size = extents_.back().offset + extents_.back().size;
SparsePtr s(sparse_file_new(block_size, flashed_size), sparse_file_destroy);
for (const auto& extent : extents_) {
if (extent.offset / block_size > UINT_MAX) {
// Super image is too big to send via sparse files (>8TB).
LOG(VERBOSE) << "super image is too big to flash";
return {nullptr, nullptr};
}
unsigned int block = extent.offset / block_size;
int rv = 0;
switch (extent.type) {
case SuperImageExtent::Type::DONTCARE:
break;
case SuperImageExtent::Type::ZERO:
rv = sparse_file_add_fill(s.get(), 0, extent.size, block);
break;
case SuperImageExtent::Type::DATA:
rv = sparse_file_add_data(s.get(), extent.blob->data(), extent.size, block);
break;
case SuperImageExtent::Type::PARTITION: {
auto iter = image_fds_.find(extent.image_name);
if (iter == image_fds_.end()) {
LOG(FATAL) << "image added but not found: " << extent.image_name;
return {nullptr, nullptr};
}
rv = sparse_file_add_fd(s.get(), iter->second.get(), extent.image_offset,
extent.size, block);
break;
}
default:
LOG(VERBOSE) << "unrecognized extent type in super image layout";
return {nullptr, nullptr};
}
if (rv) {
LOG(VERBOSE) << "sparse failure building super image layout";
return {nullptr, nullptr};
}
}
return s;
}
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