/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "libdm/dm_table.h"
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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namespace android {
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namespace dm {
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bool DmTable::AddTarget(std::unique_ptr<DmTarget>&& target) {
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if (!target->Valid()) {
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return false;
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}
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targets_.push_back(std::move(target));
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return true;
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}
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bool DmTable::RemoveTarget(std::unique_ptr<DmTarget>&& /* target */) {
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return true;
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}
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bool DmTable::valid() const {
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if (targets_.empty()) {
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LOG(ERROR) << "Device-mapper table must have at least one target.";
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return "";
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}
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if (targets_[0]->start() != 0) {
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LOG(ERROR) << "Device-mapper table must start at logical sector 0.";
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return "";
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}
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return true;
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}
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uint64_t DmTable::num_sectors() const {
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return valid() ? num_sectors_ : 0;
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}
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// Returns a string representation of the table that is ready to be passed
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// down to the kernel for loading.
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//
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// Implementation must verify there are no gaps in the table, table starts
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// with sector == 0, and iterate over each target to get its table
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// serialized.
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std::string DmTable::Serialize() const {
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if (!valid()) {
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return "";
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}
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std::string table;
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for (const auto& target : targets_) {
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table += target->Serialize();
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}
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return table;
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}
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} // namespace dm
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} // namespace android
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