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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.
*/
#include "libdm/dm_table.h"
#include <android-base/logging.h>
#include <android-base/macros.h>
namespace android {
namespace dm {
bool DmTable::AddTarget(std::unique_ptr<DmTarget>&& target) {
if (!target->Valid()) {
return false;
}
num_sectors_ += target->size();
targets_.push_back(std::move(target));
return true;
}
bool DmTable::RemoveTarget(std::unique_ptr<DmTarget>&& /* target */) {
return true;
}
bool DmTable::valid() const {
if (targets_.empty()) {
LOG(ERROR) << "Device-mapper table must have at least one target.";
return "";
}
if (targets_[0]->start() != 0) {
LOG(ERROR) << "Device-mapper table must start at logical sector 0.";
return "";
}
return true;
}
uint64_t DmTable::num_sectors() const {
return valid() ? num_sectors_ : 0;
}
// Returns a string representation of the table that is ready to be passed
// down to the kernel for loading.
//
// Implementation must verify there are no gaps in the table, table starts
// with sector == 0, and iterate over each target to get its table
// serialized.
std::string DmTable::Serialize() const {
if (!valid()) {
return "";
}
std::string table;
for (const auto& target : targets_) {
table += target->Serialize();
}
return table;
}
} // namespace dm
} // namespace android
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