1 // 2 // Copyright (C) 2020 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 #ifndef __COW_OPERATION_CONVERT_H 18 #define __COW_OPERATION_CONVERT_H 19 20 #include <vector> 21 22 #include <libsnapshot/cow_format.h> 23 24 #include "update_engine/update_metadata.pb.h" 25 26 namespace chromeos_update_engine { 27 struct CowOperation { 28 enum Type { 29 CowCopy = android::snapshot::kCowCopyOp, 30 CowReplace = android::snapshot::kCowReplaceOp, 31 }; 32 Type op; 33 uint64_t src_block; 34 uint64_t dst_block; 35 }; 36 37 // Convert SOURCE_COPY operations in `operations` list to a list of 38 // CowOperations according to the merge sequence. This function only converts 39 // SOURCE_COPY, other operations are ignored. If there's a merge conflict in 40 // SOURCE_COPY operations, some blocks may be converted to COW_REPLACE instead 41 // of COW_COPY. 42 43 // The list returned does not necessarily preserve the order of 44 // SOURCE_COPY in `operations`. The only guarantee about ordering in the 45 // returned list is that if operations are applied in such order, there would be 46 // no merge conflicts. 47 48 // This funnction is intended to be used by delta_performer to perform 49 // SOURCE_COPY operations on Virtual AB Compression devices. 50 std::vector<CowOperation> ConvertToCowOperations( 51 const ::google::protobuf::RepeatedPtrField< 52 ::chromeos_update_engine::InstallOperation>& operations, 53 const ::google::protobuf::RepeatedPtrField<CowMergeOperation>& 54 merge_operations); 55 } // namespace chromeos_update_engine 56 #endif 57