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Merge "libsnapshot: Verify the ordering of COW operations." into main

This commit is contained in:
Akilesh Kailash 2023-07-28 22:52:20 +00:00 committed by Gerrit Code Review
parent b0f9c07590 63ec4c6180
commit 1db90d0aac
1 changed files with 25 additions and 0 deletions
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25
fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
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@ -310,9 +310,34 @@ bool CowReader::PrepMergeOps() {
bool CowReader::VerifyMergeOps() {
auto itr = GetMergeOpIter(true);
std::unordered_map<uint64_t, const CowOperation*> overwritten_blocks;
bool non_ordered_op_found = false;
while (!itr->AtEnd()) {
const auto& op = itr->Get();
uint64_t offset;
// Op should not be a metadata
if (IsMetadataOp(*op)) {
LOG(ERROR) << "Metadata op: " << op << " found during merge sequence";
return false;
}
// Sequence ops should contain all the ordered ops followed
// by Replace and Zero ops. If we find the first op which
// is not ordered, that means all ordered ops processing
// has been completed.
if (!IsOrderedOp(*op)) {
non_ordered_op_found = true;
}
// Since, all ordered ops processing has been completed,
// check that the subsequent ops are not ordered.
if (non_ordered_op_found && IsOrderedOp(*op)) {
LOG(ERROR) << "Invalid sequence - non-ordered and ordered ops"
<< " cannot be mixed during sequence generation";
return false;
}
if (!GetSourceOffset(op, &offset)) {
itr->Next();
continue;