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 uint64_t block_count{1}; 36 }; 37 38 // Convert SOURCE_COPY operations in `operations` list to a list of 39 // CowOperations according to the merge sequence. This function only converts 40 // SOURCE_COPY, other operations are ignored. If there's a merge conflict in 41 // SOURCE_COPY operations, some blocks may be converted to COW_REPLACE instead 42 // of COW_COPY. 43 44 // The list returned does not necessarily preserve the order of 45 // SOURCE_COPY in `operations`. The only guarantee about ordering in the 46 // returned list is that if operations are applied in such order, there would be 47 // no merge conflicts. 48 49 // This funnction is intended to be used by delta_performer to perform 50 // SOURCE_COPY operations on Virtual AB Compression devices. 51 std::vector<CowOperation> ConvertToCowOperations( 52 const ::google::protobuf::RepeatedPtrField< 53 ::chromeos_update_engine::InstallOperation>& operations, 54 const ::google::protobuf::RepeatedPtrField<CowMergeOperation>& 55 merge_operations); 56 } // namespace chromeos_update_engine 57 #endif 58