1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "libdm/dm_table.h" 18 19 #include <android-base/logging.h> 20 #include <android-base/macros.h> 21 22 namespace android { 23 namespace dm { 24 AddTarget(std::unique_ptr<DmTarget> && target)25bool DmTable::AddTarget(std::unique_ptr<DmTarget>&& target) { 26 if (!target->Valid()) { 27 return false; 28 } 29 num_sectors_ += target->size(); 30 targets_.push_back(std::move(target)); 31 return true; 32 } 33 RemoveTarget(std::unique_ptr<DmTarget> &&)34bool DmTable::RemoveTarget(std::unique_ptr<DmTarget>&& /* target */) { 35 return true; 36 } 37 valid() const38bool DmTable::valid() const { 39 if (targets_.empty()) { 40 LOG(ERROR) << "Device-mapper table must have at least one target."; 41 return ""; 42 } 43 if (targets_[0]->start() != 0) { 44 LOG(ERROR) << "Device-mapper table must start at logical sector 0."; 45 return ""; 46 } 47 return true; 48 } 49 num_sectors() const50uint64_t DmTable::num_sectors() const { 51 return valid() ? num_sectors_ : 0; 52 } 53 54 // Returns a string representation of the table that is ready to be passed 55 // down to the kernel for loading. 56 // 57 // Implementation must verify there are no gaps in the table, table starts 58 // with sector == 0, and iterate over each target to get its table 59 // serialized. Serialize() const60std::string DmTable::Serialize() const { 61 if (!valid()) { 62 return ""; 63 } 64 65 std::string table; 66 for (const auto& target : targets_) { 67 table += target->Serialize(); 68 } 69 return table; 70 } 71 72 } // namespace dm 73 } // namespace android 74